US20110089074A1 - Formaldehyde-free mineral fibre insulation product - Google Patents

Formaldehyde-free mineral fibre insulation product Download PDF

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Publication number
US20110089074A1
US20110089074A1 US12/940,601 US94060110A US2011089074A1 US 20110089074 A1 US20110089074 A1 US 20110089074A1 US 94060110 A US94060110 A US 94060110A US 2011089074 A1 US2011089074 A1 US 2011089074A1
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insulating material
mineral fiber
fiber insulating
mineral
organic
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US12/940,601
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Roger Jackson
Tony Aindow
George Baybutt
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/7654—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings
    • E04B1/7658—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising an insulating layer, disposed between two longitudinal supporting elements, e.g. to insulate ceilings comprising fiber insulation, e.g. as panels or loose filled fibres
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00—Compositions for artificial stone, not containing binders
    • C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4209—Inorganic fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/1006—Absence of well-defined organic compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/16—Two dimensionally sectional layer
    • Y10T428/161—Two dimensionally sectional layer with frame, casing, or perimeter structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/16—Two dimensionally sectional layer
    • Y10T428/163—Next to unitary web or sheet of equal or greater extent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity

Definitions

  • This invention relates to a mineral fibre insulating product having a low formaldehyde or formaldehyde free binder.
  • binders used for fibre insulation for example glass wool and rock wool insulation are based on phenol formaldehyde. Whilst such binders can provide suitable properties to the insulating products there has for some time been a desire to move away from the use of phenol formaldehyde, particularly due to environmental considerations.
  • the present invention provides a packaged mineral fibre insulating material as defined in claim 1 .
  • Other aspects are defined in other independent claims.
  • Preferred and/or alternative features are defined in the dependent claims.
  • formaldehyde free means that the composition is substantially free from formaldehyde, preferably does not liberate substantial formaldehyde as a result of drying or curing and/or preferably comprises less than one part per million by weight of formaldehyde.
  • Desired characteristics to be conferred by the binder on some mineral wool insulation product can be assessed by measuring Recovered Thickness and/or Ordinary Parting Strength and/or Weathered Parting Strength. The procedures for measuring these characteristics are set out below. This is particularly the case for low and medium density insulating products, for example, having a density in the range 5-40 kg/m 3 , for example roll insulation and/or glass wool thermal insulation for lofts and/or cavity walls.
  • Desired characteristics for some mineral wool insulation product can be assessed by measuring Ordinary Compression Strength and/or Weathered Compression Strength. The procedures for measuring these characteristics are set out below. This is particularly for higher density insulating products, for example, insulating 5 boards or materials adapted for use as: a fire barrier; a fire protection; cladding for a building; a ceiling tile; a roof board; thermal insulation for high temperature machinery for example, generators, ovens and industrial plant. Such products may be made of rock wool.
  • the pH of the binder when applied may be substantially neutral or alkaline; this may facilitate handling and avoid significant corrosion and/or environmental problems. Its pH when applied may be: greater than or equal to 7 and/or less than or equal to 10; between 7 and 10; between 8 and 10.
  • An important aspect of the invention is the pH of the binder in liquid form when applied to the fibres as this is the form in which the binder will have significant contact with manufacturing equipment as freshly prepared and in a wash water system.
  • the binder may change its pH as it cures; it may become more acidic as it cures. Nevertheless, once cured, the binder has less direct contact with the manufacturing equipment. Furthermore, where the cured binder is substantially insoluble in water, which is preferably the case, there is little risk of acid contamination from the cured binder.
  • binders of this type at 15% or less by weight can confer the desired characteristics on the insulating product.
  • This amount of binder is comparable with the binder contents commonly used with phenol formaldehyde based binders.
  • the cured binder content may be 12% or less or 10% or less; it may be within the range of 3-8%, particularly 3.5-6% by weight.
  • the binder content may be determined by loss on ignition. Such binder contents are particularly suitable for low and medium density products. Particularly for higher density products, the cured binder content may be in the range 0.5-5% by weight.
  • the binder may:
  • the binder may be based on a combination of a polycarboxylic acid, for example citric acid, a sugar, for example dextrose, and a source of ammonia, for example ammonia solution. It may be based on a combination of ammonium citrate and dextrose.
  • a polycarboxylic acid for example citric acid
  • sugar for example dextrose
  • ammonia solution for example ammonia solution
  • ammonia solution for example ammonia solution. It may be based on a combination of ammonium citrate and dextrose.
  • the binder is based on sugars and/or citric acid and or comprises significant —OH groups, it is particularly surprising that such levels of Weathered Parting Strength can be achieved. It would have been thought that the —OH groups for example in the sugars and/or citric acid would be readily subject to hydrolysis and that the binder would consequently loose significant strength in humid and/or weathering conditions.
  • the binder may comprise a silicon containing compound, particularly a silane; this may be an amino-substituted compound; it may be a silyl ether; it may facilitate adherence of the binder to the mineral fibres.
  • the binder may comprise melanoidins; it may be a thermoset binder; it may be thermally curable.
  • the binder may be one of those disclosed in International patent application No. PCT/US2006/028929, the contents of which is hereby incorporated by reference.
  • the insulating material may be packaged or be provided in the form of a package; the package may comprise one or more mineral wool insulating products arranged and/or bound together, for example to facilitate transport; it may comprise an enveloping film, for example of a plastics material.
  • the package may comprise or consist of a roll of insulating material or an assembly of individual slabs of insulating material.
  • the insulating material particularly when it is a low or medium density product, may have
  • the insulating material particularly when it is an insulating board or a higher density product, may have
  • the mineral fibres may be glass wool or rock wool; the fibres may have an average diameter between 2 and 9 microns or be microfibres of smaller diameter; they may have an average length between 8 and 80 mm.
  • the mineral fibres may be crimped.
  • the present invention provides a mineral fibre insulating material having at least one of the following features:
  • the insulating material may have any combination of these features; these features may be combined with other features and/or aspects described herein.
  • FIG. 1 shows the form of samples used for testing parting strength.
  • An aqueous binder was prepared by mixing together:
  • This binder was used in the manufacture of a fibre glass insulating product on a standard manufacturing line, the binder being sprayed onto glass fibres just after fiberising using internal spinners and the coated fibres being collected, assembled in to a mat and cured in the usual way.
  • the binder had a pH of about 8 when applied to the glass fibres.
  • the cured glass fibre insulating product had:
  • Thickness is tested and measured in accordance with Annex A of British standard BS EN 823: 1995 (incorporated herein by reference) and expressed as a % of the nominal or announced thickness for the product measured.
  • Parting strength is a measure of the tensile strength of mineral fibre mats determined by placing an O shaped sample over cylindrical jaws, separating the jaws and measuring the load to break the fibres. Although it can be measured in Newtons per gram, the parting strength is expressed in grams/gram being the total breaking load of six test specimens divided by their total weight.
  • the test is carried out on mineral fibre mats as received for testing (Ordinary Parting Strength) and after an accelerated weathering test as explained below (Weathered Parting Strength).
  • a first set of six samples of the form and dimensions shown in FIG. 1 are cut from the mineral fibre mat to be tested; the long axis of the samples should be parallel to the conveyor direction and the samples should be taken across the full width of the mineral mat.
  • a second set of six samples is then taken in the same way.
  • the dimensions in FIG. 1 are in mm.
  • the total weight of the first group of six samples W 1 in grams is recorded.
  • the total weight of the second group of six samples W 2 in grams is recorded; these samples are then placed in a preheated autoclave and conditioned on a wire mesh shelf away from the bottom of the chamber under wet steam at 35 kN/m 2 for one hour. They are then removed, dried in an oven at 100° C. for five minutes and tested immediately for parting strength.
  • each sample is mounted in turn on the jaws of the tensile strength machine and the maximum breaking load in grams or Newtons is recorded. If the breaking load is measured in Newtons it is converted to grams by multiplying it by 101.9. Six results in grams are obtained for each set of samples: G 1 G 2 G 3 G 4 G 5 and G 6 for the first set of samples and G 7 G 8 G 9 G 10 G 11 and G 12 for the second set of samples.
  • an aqueous binder was prepared by mixing together:
  • This binder was used in the manufacture of a rock wool roof board on a standard manufacturing line, the binder being sprayed onto the fibres just after fiberising and the coated fibres being collected, assembled in to a mat, compressed and cured in the usual way.
  • the cured roof board had:
  • Weathered Compression Strength is measured according to British Standard BS EN 826: 1996 on samples that have been subjected to the following accelerated weathering procedure: samples are cut to size and then placed in a preheated autoclave and conditioned on a wire mesh shelf away from the bottom of the chamber under wet steam at 35 kN/m 2 for one hour. They are then removed, dried in an oven at 100° C. for five minutes and tested immediately for compression strength.
  • compression strength is determined in the direction of the thickness of the product; the dimensions of face of the samples in contact with the compression test apparatus are preferably 200 mm ⁇ 200 mm.

Abstract

A packaged mineral fibre insulating material has: a) a Recovered Thickness of at least 95% nominal thickness; and b) an Ordinary Parting Strength of at least 95 g/g; and c) a Weathered Parting Strength of at least 75 g/g the material comprising mineral fibres and an organic, formaldehyde free binder in a quantity of less than 15% by weight, preferably less than 10% by weight, said binder having been applied to the fibres of the insulating material in liquid form at pH of greater than 5.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a continuation of U.S. patent application Ser. No. 12/524,491, filed Nov. 12, 2009, which is a U.S. national counterpart application of application serial no. PCT/EP2007/050750 filed Jan. 25, 2007.
    • FIELD OF THE INVENTION
  • This invention relates to a mineral fibre insulating product having a low formaldehyde or formaldehyde free binder.
    • BACKGROUND
  • Industry standard binders used for fibre insulation, for example glass wool and rock wool insulation are based on phenol formaldehyde. Whilst such binders can provide suitable properties to the insulating products there has for some time been a desire to move away from the use of phenol formaldehyde, particularly due to environmental considerations.
  • Traditional polyester based binder systems have previously been proposed but have not gained acceptance in the insulation industry, particularly as their strength in holding the mineral fibres together, especially when exposed to moisture or weathering, has been perceived as insufficient.
  • To date, only one low formaldehyde based mineral insulation binder system has been used on an industrial scale on glass wool insulation; this is based on polyacrylic acid and supplied by Rohm & Haas. Unfortunately, the highly acid nature of these types of binders can cause excessive corrosion of manufacturing plant unless significant investment is made in acid resistant equipment. U.S. Pat. No. 5,977,232 discloses a formaldehyde free binder for glass wool insulation based on a polycarboxylic acid. European patent application EP1698598A discloses use of a corrosion meter to try to mitigate problems associated with polycarboxylic acid-based fibreglass binder resins. In addition, whilst the strength of these binders is acceptable for some applications it is not as good as the commonly used phenol formaldehyde based binders.
  • It has not been thought possible to provide a formaldehyde free binder system useable on an industrial scale that will confer required characteristics, including strength, to mineral wool insulating products without encountering the difficulties associated with highly acidic liquid binder systems.
    • SUMMARY
  • According to one aspect, the present invention provides a packaged mineral fibre insulating material as defined in claim 1. Other aspects are defined in other independent claims. Preferred and/or alternative features are defined in the dependent claims.
    • DETAILED DESCRIPTION
  • As used herein, the term formaldehyde free means that the composition is substantially free from formaldehyde, preferably does not liberate substantial formaldehyde as a result of drying or curing and/or preferably comprises less than one part per million by weight of formaldehyde.
  • Desired characteristics to be conferred by the binder on some mineral wool insulation product can be assessed by measuring Recovered Thickness and/or Ordinary Parting Strength and/or Weathered Parting Strength. The procedures for measuring these characteristics are set out below. This is particularly the case for low and medium density insulating products, for example, having a density in the range 5-40 kg/m3, for example roll insulation and/or glass wool thermal insulation for lofts and/or cavity walls.
  • Desired characteristics for some mineral wool insulation product can be assessed by measuring Ordinary Compression Strength and/or Weathered Compression Strength. The procedures for measuring these characteristics are set out below. This is particularly for higher density insulating products, for example, insulating 5 boards or materials adapted for use as: a fire barrier; a fire protection; cladding for a building; a ceiling tile; a roof board; thermal insulation for high temperature machinery for example, generators, ovens and industrial plant. Such products may be made of rock wool.
  • The pH of the binder when applied may be substantially neutral or alkaline; this may facilitate handling and avoid significant corrosion and/or environmental problems. Its pH when applied may be: greater than or equal to 7 and/or less than or equal to 10; between 7 and 10; between 8 and 10.
  • An important aspect of the invention is the pH of the binder in liquid form when applied to the fibres as this is the form in which the binder will have significant contact with manufacturing equipment as freshly prepared and in a wash water system. The binder may change its pH as it cures; it may become more acidic as it cures. Nevertheless, once cured, the binder has less direct contact with the manufacturing equipment. Furthermore, where the cured binder is substantially insoluble in water, which is preferably the case, there is little risk of acid contamination from the cured binder.
  • It is surprising that binders of this type at 15% or less by weight can confer the desired characteristics on the insulating product. This amount of binder is comparable with the binder contents commonly used with phenol formaldehyde based binders. The cured binder content may be 12% or less or 10% or less; it may be within the range of 3-8%, particularly 3.5-6% by weight. The binder content may be determined by loss on ignition. Such binder contents are particularly suitable for low and medium density products. Particularly for higher density products, the cured binder content may be in the range 0.5-5% by weight.
  • The binder may:
      • be based on a reducing sugar; and/or
      • be based on reductosis; and/or
      • be based on an aldehyde containing sugars/and/or
      • include at least one reaction product of a carbohydrate reactant and an amine reactant; and/or
      • include at least one reaction product of a reducing sugar and an amine reactant; and/or
      • include at least one reaction product of a carbohydrate reactant and a polycarboxylic acid ammonium salt reactant; and/or
      • include at least one reaction product from a Maillard reaction.
  • The binder may be based on a combination of a polycarboxylic acid, for example citric acid, a sugar, for example dextrose, and a source of ammonia, for example ammonia solution. It may be based on a combination of ammonium citrate and dextrose. Where the binder is based on sugars and/or citric acid and or comprises significant —OH groups, it is particularly surprising that such levels of Weathered Parting Strength can be achieved. It would have been thought that the —OH groups for example in the sugars and/or citric acid would be readily subject to hydrolysis and that the binder would consequently loose significant strength in humid and/or weathering conditions.
  • The binder may comprise a silicon containing compound, particularly a silane; this may be an amino-substituted compound; it may be a silyl ether; it may facilitate adherence of the binder to the mineral fibres.
  • The binder may comprise melanoidins; it may be a thermoset binder; it may be thermally curable.
  • The binder may be one of those disclosed in International patent application No. PCT/US2006/028929, the contents of which is hereby incorporated by reference.
  • The insulating material may be packaged or be provided in the form of a package; the package may comprise one or more mineral wool insulating products arranged and/or bound together, for example to facilitate transport; it may comprise an enveloping film, for example of a plastics material. The package may comprise or consist of a roll of insulating material or an assembly of individual slabs of insulating material.
  • The insulating material, particularly when it is a low or medium density product, may have
      • a nominal thickness in the range 60-260 mm; and/or
      • a thermal resistance R of R≧3 m2K/W, preferably R≧4 m2K/W at a thickness or 200 mm; and/or
      • a density in the range 5-40 kg/m3, particularly 5-18 kg/m3 or 7-12 kg/m3, for example for low density roll products.
  • The insulating material, particularly when it is an insulating board or a higher density product, may have
      • a nominal thickness in the range 20 to 200 mm; and/or
      • a thermal resistance R of R≧1.7 m2K/W, preferably R≧2 m2K/W at a thickness of 100 mm; and/or
      • a density in the range 100 to 200 kg/m3, particularly 130 to 190 kg/m3.
  • The mineral fibres may be glass wool or rock wool; the fibres may have an average diameter between 2 and 9 microns or be microfibres of smaller diameter; they may have an average length between 8 and 80 mm.
  • The mineral fibres may be crimped.
  • According to a further aspect, the present invention provides a mineral fibre insulating material having at least one of the following features:
      • the insulating material having cut edges;
      • the insulating material having a facing provided on at least one of its major surface, for example comprising a moisture penetration barrier and/or a Kraft paper and/or an aluminium foil and/or a plastics layer and/or a laminate sheet comprising a plurality of individual layers and/or a woven or non-woven fabric; a facing may be provided on each major surface of the insulating material;
      • the insulating material being a packaged insulating material held under compression for example by one or more packaging components, for example by an enveloping packaging film; the insulating material may be compressed to 80% or less of its non-compressed thickness;
      • the insulating material being in the form of pipe insulation having a length of greater than 30 cm; the cross-section may be substantially annular;
      • the insulating material being in the form of a compressed roll of material;
      • the insulating material being in the form of a compressed slab of material;
      • the insulating material being a roll or slab having a length of greater than or equal to 1 m, preferably greater than or equal to 2 m;
      • the insulating material being a roll or slab having a width of greater than or equal to 0.3 m, preferably greater than or equal to 0.5 m;
      • the insulating material having a nominal thickness of at least 45 mm, preferably at least 50 mm, and a density in the range 5-40 kg/m3.
  • The insulating material may have any combination of these features; these features may be combined with other features and/or aspects described herein.
    • Examples
  • Non-limiting examples of the invention are described below with reference to FIG. 1 which shows the form of samples used for testing parting strength.
  • An aqueous binder was prepared by mixing together:
  • Approximate %
    by weight
    Powdered dextrose monohydrate 12.9%
    Powdered anhydrous citric acid  2.3%
    28% aqueous ammonia  2.6%
    Silane A-1100 0.05%
    water 82.1%
  • This binder was used in the manufacture of a fibre glass insulating product on a standard manufacturing line, the binder being sprayed onto glass fibres just after fiberising using internal spinners and the coated fibres being collected, assembled in to a mat and cured in the usual way.
  • The binder had a pH of about 8 when applied to the glass fibres.
  • The cured glass fibre insulating product had:
      • a binder content of about 5% by weight as determined by loss on ignition
      • a thickness of about 150 mm
      • a density of about 9 kg/m3
  • This is suitable as a low density residential roll insulation product; it was packaged in a roll under compression.
  • Desired characteristics and results achieved are set out in Table 1:
  • TABLE 1
    Accept-
    ance Pre- More Most Result
    Units Limit ferred Preferred Preferred Achieved
    Recovered % of ≧95 ≧100 ≧110 ≧120 103
    Thickness nominal
    Ordinary g/g ≧95 ≧100 ≧150 ≧200 122
    Parting
    Strength
    Weathered g/g ≧75 ≧80 ≧100 ≧150 112
    Parting
    Strength
    • Testing of Recovered Thickness:
  • Recovered Thickness is tested and measured in accordance with Annex A of British standard BS EN 823: 1995 (incorporated herein by reference) and expressed as a % of the nominal or announced thickness for the product measured.
    • Testing of Ordinary Parting Strength and Weathered Parting Strength:
  • Parting strength is a measure of the tensile strength of mineral fibre mats determined by placing an O shaped sample over cylindrical jaws, separating the jaws and measuring the load to break the fibres. Although it can be measured in Newtons per gram, the parting strength is expressed in grams/gram being the total breaking load of six test specimens divided by their total weight.
  • The test is carried out on mineral fibre mats as received for testing (Ordinary Parting Strength) and after an accelerated weathering test as explained below (Weathered Parting Strength).
  • A first set of six samples of the form and dimensions shown in FIG. 1 are cut from the mineral fibre mat to be tested; the long axis of the samples should be parallel to the conveyor direction and the samples should be taken across the full width of the mineral mat. A second set of six samples is then taken in the same way. The dimensions in FIG. 1 are in mm.
  • The total weight of the first group of six samples W1 in grams is recorded.
  • The total weight of the second group of six samples W2 in grams is recorded; these samples are then placed in a preheated autoclave and conditioned on a wire mesh shelf away from the bottom of the chamber under wet steam at 35 kN/m2 for one hour. They are then removed, dried in an oven at 100° C. for five minutes and tested immediately for parting strength.
  • To test the parting strength, each sample is mounted in turn on the jaws of the tensile strength machine and the maximum breaking load in grams or Newtons is recorded. If the breaking load is measured in Newtons it is converted to grams by multiplying it by 101.9. Six results in grams are obtained for each set of samples: G1 G2 G3 G4 G5 and G6 for the first set of samples and G7 G8 G9 G10 G11 and G12 for the second set of samples.
  • The Ordinary Parting Strength is calculated from the first set of samples using the formula Ordinary Parting Strength=(G1+G2+G3+G4+G5+G6)/W1.
  • The Weathered Parting Strength is calculated from the second set of samples using the formula Weathered Parting Strength=(G7+G8+G9+G10+G11+G12)/W2.
  • In another example, an aqueous binder was prepared by mixing together:
  • Approximate %
    by weight
    Powdered dextrose monohydrate 19.1%
    Powdered anhydrous citric acid  3.4%
    28% aqueous ammonia  2.6%
    Silane A-1100 0.07%
    water 73.5%
  • This binder was used in the manufacture of a rock wool roof board on a standard manufacturing line, the binder being sprayed onto the fibres just after fiberising and the coated fibres being collected, assembled in to a mat, compressed and cured in the usual way.
  • The cured roof board had:
      • a binder content of about 3% by weight as determined by loss on ignition
      • a thickness of about 80 mm
      • a density of about 150 kg/m3
  • It was packaged as part of a stack of insulation boards.
  • Desired characteristics and results achieved are set out in Table 2:
  • TABLE 2
    Accept-
    ance Pre- More Most Result
    Units Limit ferred Preferred Preferred Achieved
    Ordinary kPa ≧60 ≧70 ≧80 ≧90 72.3
    Compression
    Strength
    Weathered kPa ≧25 ≧30 ≧40 ≧50 54.6
    Compression
    Strength
    • Testing of Ordinary Compression Strength and Weathered Compression Strength:
  • Ordinary Compression Strength is measured according to British Standard BS EN 826: 1996 (incorporated herein by reference).
  • Weathered Compression Strength is measured according to British Standard BS EN 826: 1996 on samples that have been subjected to the following accelerated weathering procedure: samples are cut to size and then placed in a preheated autoclave and conditioned on a wire mesh shelf away from the bottom of the chamber under wet steam at 35 kN/m2 for one hour. They are then removed, dried in an oven at 100° C. for five minutes and tested immediately for compression strength.
  • In both cases, compression strength is determined in the direction of the thickness of the product; the dimensions of face of the samples in contact with the compression test apparatus are preferably 200 mm×200 mm.

Claims (20)

1. A mineral fiber insulating material comprising mineral fibers and less than about 15% by weight of an organic binder, wherein
a) the organic binder is a formaldehyde free product of curing an aqueous solution having a pH of greater than 5 when applied to the mineral fibers,
b) the mineral fiber insulating material has a recovered thickness of at least about 95% as determined according to Annex A of British standard BS EN 823: 1995,
c) the mineral fiber insulating material having an ordinary parting strength of at least about 95 g/g,
d) the mineral fiber insulating material having a weathered parting strength of at least about 75 g/g, and
e) the mineral fiber insulating material is packaged.
2. The mineral fiber insulating material of claim 1, wherein the recovered thickness is at least about 100%.
3. The mineral fiber insulating material of claim 1, wherein the ordinary parting strength is at least about 100 g/g.
4. The mineral fiber insulating material of claim 1, wherein the weathered parting strength is at least about 80 g/g.
5. The mineral fiber insulating material of claim 1, wherein the mineral fiber insulating material is a rolled product having a density between about 5 and about 40 kg/m3 and the mineral fiber insulating material is packaged under compression.
6. The mineral fiber insulating material of claim 1, wherein the organic, formaldehyde free binder is the product of drying and curing the aqueous solution with the pH being less than about 11 when applied to the mineral fibers.
7. The mineral fiber insulating material of claim 6, wherein the organic, formaldehyde free binder is the product of drying and curing the aqueous solution with the pH being between about 6 and about 10 when applied to the mineral fibers.
8. The mineral fiber insulating material of claim 1, wherein the organic, formaldehyde free binder is between about 2% and about 8% of the mineral fiber insulating material by weight.
9. The mineral fiber insulating material of claim 1, wherein the organic, formaldehyde free binder comprises a product of a reaction including a reducing sugar.
10. The mineral fiber insulating material of claim 1, wherein the organic, formaldehyde free binder comprises at least one Maillard reaction product.
11. A mineral fiber insulating material having a density in a range of 100 to 200 kg/m3 comprising mineral fibers and less than 15% by weight an organic, formaldehyde free binder, wherein
a) the mineral fiber insulating material has an ordinary compression strength of at least about 60 kPa,
b) the mineral fiber insulating material has a weathered compression strength of at least about 25 kPa,
c) the organic, formaldehyde free binder is a product of drying and curing an aqueous solution with a pH of greater than about 5 when applied to the mineral fibers, and
d) the mineral fiber insulating material is packaged.
12. The mineral fiber insulating material of claim 11, wherein the ordinary compression strength is at least about 70 kPa.
13. The mineral fiber insulating material of claim 11, wherein the weathered compression strength is at least about 30 kPa.
14. The mineral fiber insulating material of claim 11, wherein the organic, formaldehyde free binder is the product of drying and curing the aqueous solution with the pH being less than about 11 when applied to the mineral fibers.
15. The mineral fiber insulating material of claim 11, wherein the organic, formaldehyde free binder is the product of drying and curing the aqueous solution with the pH being between about 6 and about 10 when applied to the mineral fibers.
16. The mineral fiber insulating material of claim 11, wherein the organic, formaldehyde free binder is between about 2% and about 8% of the mineral fiber insulating material by weight.
17. The mineral fiber insulating material of claim 11, wherein the organic, formaldehyde free binder comprises a product of a reaction including a reducing sugar.
18. The mineral fiber insulating material of claim 11, wherein the organic, formaldehyde free binder comprises at least one Maillard reaction product.
19. The mineral fiber insulating material of claim 11, wherein the aqueous solution further comprises citric acid, ammonia and dextrose.
20. A method of manufacturing a packaged mineral fibre insulating material selected from the group consisting of:
(i) material having
a) a Recovered Thickness of at least 95%; and
b) an Ordinary Parting Strength of at least 95 g/g; and
c) a Weathered Parting Strength of at least 75 g/g; and
(ii) material having
a) an Ordinary Compression Strength of at least 60 kPa; and
b) a Weathered Compression Strength of at least 25 kPa;
comprising the steps of
i) applying an organic, formaldehyde free binder in aqueous solution to the mineral fibres at a pH of greater than 5 and
ii) curing the product so that it contains a quantity of less than 15% by weight of binder and
iii) packaging the insulating material.
US12/940,601 2007-01-25 2010-11-05 Formaldehyde-free mineral fibre insulation product Abandoned US20110089074A1 (en)

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US11945979B2 (en) 2018-03-27 2024-04-02 Knauf Insulation, Inc. Composite products

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PT2126179E (en) 2014-12-29
EP2126179A1 (en) 2009-12-02
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DK2126179T3 (en) 2014-11-03
BRPI0721233A2 (en) 2013-01-01
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CN101688343B (en) 2011-12-14
EP2826903B1 (en) 2023-04-26

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