WO2000027769A1 - Flame retarded thermally insulated glass - Google Patents

Flame retarded thermally insulated glass Download PDF

Info

Publication number
WO2000027769A1
WO2000027769A1 PCT/GB1999/003423 GB9903423W WO0027769A1 WO 2000027769 A1 WO2000027769 A1 WO 2000027769A1 GB 9903423 W GB9903423 W GB 9903423W WO 0027769 A1 WO0027769 A1 WO 0027769A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass
coating
flame retardant
sheet
solution
Prior art date
Application number
PCT/GB1999/003423
Other languages
French (fr)
Inventor
Derek Arthur Ward
Original Assignee
Environmental Seals Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Environmental Seals Ltd. filed Critical Environmental Seals Ltd.
Priority to AU63508/99A priority Critical patent/AU6350899A/en
Publication of WO2000027769A1 publication Critical patent/WO2000027769A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/42—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/3405—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of organic materials

Definitions

  • This invention relates to thermally insulated glass and to methods for producing such glass. More especially but not exclusively the invention concerns the production of glass sheets coated on at least one surface with a transparent dry coherent coating of a thermally insulating material.
  • Gel formers for coating glass sheets are known. Such gel formers are disclosed in EP-PS-596322 and EP-PS-596324. Such formers may be used as intumescent carriers to provide fire proofing to glass.
  • One disadvantage of these known gel formers is an inability to set to provide a solid coating having high integrity.
  • US-PS-4552806 discloses a heat insulating cellular glass having a surface on which an adhesive layer and a coating layer are formed.
  • the adhesive layer comprises a solidified mix of water, glass and a porous substance containing polyvalent ions of metal and the coating layer comprises a laminate of flakes of laminar mineral. It is an object of this invention to provide a method for treating fire rated glass to thermally insulate the same and to high integrity thermally insulated coatings which do not suffer from, or at least alleviate, disadvantages to be found in the gels discussed above.
  • a method for treating glass sheets which comprises the sequential steps of applying to a clean surface of a glass sheet an aqueous solution of a flame retardant thermally insulating material which contains a quantity of intumescent material, curing the applied coating, applying to the exposed surface of the cured coating an aqueous solution of a protective material, and drying the same.
  • the invention provides glass treated by the method specified in the previous paragraph.
  • the flame retardant solution may include one or more of the following:- boron and/or boron containing compounds, aluminium or aluminium containing compounds, phosphorous or phosphorous containing compounds, alkanolamine, especially monoethanolamine, ammonium and/or amine salts of acid phosphates.
  • the flame retardant coating may be cured at either atmospheric or an elevated temperature.
  • the solution of protective material may comprise a mix of bulan-1 -01 , butyl acetate, 1 -methoxypropan 2-01 and propan 1 -01 .
  • Typical concentrations of these substances lie in the ranges 1 0 to 25%, 25 to 50%,
  • a window assembly which comprises a frame, a first sheet of fire proofed glass mounted within the frame and a second sheet of thermally insulating glass mounted within the frame and spaced from the sheet of fire proofed glass, the internal surface of the second glass sheet being coated with sequential solutions of a flame retardant thermally insulating material and, after curing of the first coating, a solution of a material which, on drying, provides a solid coating having high integrity.
  • the window comprises a sheet of fire rated glass alongside which is positioned a second sheet of fire rated glass
  • each glass sheet is supported by beads 3. Spacings between these beads and the respective glass sheet retaining glazing strips 4 are fitted with intumescent material which expands on heating. Alternatively or additionally, beads and/or glazing strips which comprise or are coated with intumescent material may be employed.
  • Parting beads 5 are positioned between the two glass sheets. Typically, the parting beads are from 1 0 and 30 mm in width.
  • a bore 6 is provided to evacuate the spacing between the glass sheets to the atmosphere.
  • the sheets 1 , 2 are typically of 6mm glass, wired, ceramic or pyron flat glass.
  • glass sheet 1 is an existing fire rated sheet, glass sheet 2 being added to the window assembly once coated to provide thermal insulation therefor.
  • the inner face of the sheet 2 has applied to it a coating of thermally insulated material in accordance with the invention.
  • this coating will be applied to glass sheet 2 with the sheet lying generally horizontal. Firstly the surface to be coated is cleaned thoroughly to remove all traces of grease and other debris. It has been found that the treatment with an aqueous solution of acetic acid (eg. vinegar) is sufficient for this purpose. The surface is then dried.
  • acetic acid eg. vinegar
  • the thermally insulating solution comprises LEVAGARD STI TIP AL 4065 marketed by Bayer pic.
  • LEVAGARD STI TIP AL 4065 marketed by Bayer pic.
  • This is a highly viscous, odourless, clear and transparent aqueous solution of a gel which contains one or more of the following:- boran or boran containing compounds, aluminium or aluminium containing compounds, phosphorous, or phosphorous containing compounds, alkanolamine, particularly monoethanolamine, ammonium and/or amine salts of acid phosphates. These chemicals typically represent 75% by weight of the solution.
  • the viscosity of the solution at 20°C is not greater than 8000mPa-s and its pH value is between 5.8 and 6.8.
  • the solution is diluted with water before it is applied to the desired surface of the glass sheet.
  • the coating is applied at a rate of between 3 and 9 mm 2 per litre. A preferred application rate is 6mm 2 per litre.
  • a protective solution of a second material know as insuglass is applied by brush or as a spray.
  • This solution is a non-flammable, non-toxic aqueous solution which comprises a mix of Butan-1 -01 , Butylacetate, 1 -Methoxypropan-2-01 and Propan-1 -01 . Concentrations of these substances by weight % generally lie within the range 1 0-25%, 25-50%, 1 -5% and 1 0-25% respectively.
  • the coating is applied at a rate of between 3 and 1 5mm 2 per litre, typically 1 0mm' per litre. The coating rs cured at either atmospheric or an elevated temperature.
  • the protective solution is allowed to dry, the heat insulating coating being entirely covered and protected by the dried external coating.
  • the glass sheet is then positioned as illustrated to complete the assembly.
  • the presence of the applied layer to the inner side of the glass sheet 2 provides effective thermal insulation for the window. Positioning of the coated surface between the two glass sheets 1 , 2 ensures high integrity for the coated surface during normal use of the window.
  • the bore 6 is drilled through the frame at the parting bead to reduce the increased pressure occasioned in the event of a fire.
  • Advantages of the arrangement described include no removal of existing glass, easy application of the heat insulating coatings, coatings not affected by moisture and are not susceptible to damage, substantially maintenance free assembly and relatively easy to instal.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

A method for treating glass sheets comprises the sequential steps of applying to a clean surface of a glass sheet an aqueous solution of a flame retardant thermally insulating material, curing the applied coating, applying to the exposed surface of the cured coating an aqueous solution of a protective material, and drying the same. The aqueous solution of flame retardant insulating material may contain a quantity of intumescent material.

Description

FLAME RETARDED THERMALLY INSULATED GLASS
This invention relates to thermally insulated glass and to methods for producing such glass. More especially but not exclusively the invention concerns the production of glass sheets coated on at least one surface with a transparent dry coherent coating of a thermally insulating material.
It is a requirement in many countries that all glass sheets which border fire escape passages are thermally insulated. Such glass is both expensive and difficult to install and replace. On many occasions therefore thermally insulated glass is not employed. Fire rated glass does provide limited protection, but is generally not acceptable where safety considerations are paramount.
Gel formers for coating glass sheets are known. Such gel formers are disclosed in EP-PS-596322 and EP-PS-596324. Such formers may be used as intumescent carriers to provide fire proofing to glass. One disadvantage of these known gel formers is an inability to set to provide a solid coating having high integrity.
US-PS-4552806 discloses a heat insulating cellular glass having a surface on which an adhesive layer and a coating layer are formed. The adhesive layer comprises a solidified mix of water, glass and a porous substance containing polyvalent ions of metal and the coating layer comprises a laminate of flakes of laminar mineral. It is an object of this invention to provide a method for treating fire rated glass to thermally insulate the same and to high integrity thermally insulated coatings which do not suffer from, or at least alleviate, disadvantages to be found in the gels discussed above.
According to the present invention in one aspect there is provided a method for treating glass sheets which comprises the sequential steps of applying to a clean surface of a glass sheet an aqueous solution of a flame retardant thermally insulating material which contains a quantity of intumescent material, curing the applied coating, applying to the exposed surface of the cured coating an aqueous solution of a protective material, and drying the same.
In another aspect, the invention provides glass treated by the method specified in the previous paragraph.
The flame retardant solution may include one or more of the following:- boron and/or boron containing compounds, aluminium or aluminium containing compounds, phosphorous or phosphorous containing compounds, alkanolamine, especially monoethanolamine, ammonium and/or amine salts of acid phosphates.
The flame retardant coating may be cured at either atmospheric or an elevated temperature.
The solution of protective material may comprise a mix of bulan-1 -01 , butyl acetate, 1 -methoxypropan 2-01 and propan 1 -01 . Typical concentrations of these substances lie in the ranges 1 0 to 25%, 25 to 50%,
1 to 5% and 1 0 to 25 % respectively.
In another aspect, there is provided a window assembly which comprises a frame, a first sheet of fire proofed glass mounted within the frame and a second sheet of thermally insulating glass mounted within the frame and spaced from the sheet of fire proofed glass, the internal surface of the second glass sheet being coated with sequential solutions of a flame retardant thermally insulating material and, after curing of the first coating, a solution of a material which, on drying, provides a solid coating having high integrity.
The invention will now be described by way of example only with reference to the accompanying diagrammatic drawings in which the sole figure illustrates a window assembly in accordance with the invention.
As illustrated in the drawing, the window comprises a sheet of fire rated glass alongside which is positioned a second sheet of fire rated glass
2 to one surface of which has been applied a thermally insulating coating in accordance with the invention. Each glass sheet is supported by beads 3. Spacings between these beads and the respective glass sheet retaining glazing strips 4 are fitted with intumescent material which expands on heating. Alternatively or additionally, beads and/or glazing strips which comprise or are coated with intumescent material may be employed. Parting beads 5 are positioned between the two glass sheets. Typically, the parting beads are from 1 0 and 30 mm in width. A bore 6 is provided to evacuate the spacing between the glass sheets to the atmosphere.
The sheets 1 , 2 are typically of 6mm glass, wired, ceramic or pyron flat glass.
In the illustrated embodiment glass sheet 1 is an existing fire rated sheet, glass sheet 2 being added to the window assembly once coated to provide thermal insulation therefor.
As mentioned above, the inner face of the sheet 2 has applied to it a coating of thermally insulated material in accordance with the invention.
Normally this coating will be applied to glass sheet 2 with the sheet lying generally horizontal. Firstly the surface to be coated is cleaned thoroughly to remove all traces of grease and other debris. It has been found that the treatment with an aqueous solution of acetic acid (eg. vinegar) is sufficient for this purpose. The surface is then dried.
An aqueous coating of a flame retardant and thermally insulating solution is then applied to the dried surface. The solution may be applied by a brush or as a spray. Preferably, the thermally insulating solution comprises LEVAGARD STI TIP AL 4065 marketed by Bayer pic. This is a highly viscous, odourless, clear and transparent aqueous solution of a gel which contains one or more of the following:- boran or boran containing compounds, aluminium or aluminium containing compounds, phosphorous, or phosphorous containing compounds, alkanolamine, particularly monoethanolamine, ammonium and/or amine salts of acid phosphates. These chemicals typically represent 75% by weight of the solution. Typically, the viscosity of the solution at 20°C is not greater than 8000mPa-s and its pH value is between 5.8 and 6.8. The solution is diluted with water before it is applied to the desired surface of the glass sheet. Typically, the coating is applied at a rate of between 3 and 9 mm2 per litre. A preferred application rate is 6mm2 per litre.
When all traces of moisture have been removed, the cured surface of the coating remains tacky. To achieve complete drying, a protective solution of a second material know as insuglass is applied by brush or as a spray.
This solution is a non-flammable, non-toxic aqueous solution which comprises a mix of Butan-1 -01 , Butylacetate, 1 -Methoxypropan-2-01 and Propan-1 -01 . Concentrations of these substances by weight % generally lie within the range 1 0-25%, 25-50%, 1 -5% and 1 0-25% respectively. Preferably the coating is applied at a rate of between 3 and 1 5mm2 per litre, typically 1 0mm' per litre. The coating rs cured at either atmospheric or an elevated temperature.
The protective solution is allowed to dry, the heat insulating coating being entirely covered and protected by the dried external coating. The glass sheet is then positioned as illustrated to complete the assembly.
The presence of the applied layer to the inner side of the glass sheet 2 provides effective thermal insulation for the window. Positioning of the coated surface between the two glass sheets 1 , 2 ensures high integrity for the coated surface during normal use of the window. The bore 6 is drilled through the frame at the parting bead to reduce the increased pressure occasioned in the event of a fire.
Advantages of the arrangement described include no removal of existing glass, easy application of the heat insulating coatings, coatings not affected by moisture and are not susceptible to damage, substantially maintenance free assembly and relatively easy to instal.
Glass sheets of 1 400mm x 1 000mm in accordance with the invention have been tested by TRADA (Chiltern) and have been found to meet the requirements of BS476:Part 22: 1 987.
It will be appreciated that the foregoing is merely exemplary of embodiments of the invention and that various modifications can readily be made therefore without departing from the true scope of the invention.

Claims

1 . A method for treating glass sheets which comprises the sequential steps of applying to a clean surface of a glass sheet an aqueous solution of a flame retardant thermally insulating material which contains a quantity of intumescent material, curing the applied coating, applying to the exposed surface of the cured coating an aqueous solution of a protective material, and drying the same.
2. A method as claimed in claim 1 wherein the flame retardant solution includes one or more of the following:- boron and/or boron containing compounds, aluminium or aluminium containing compounds, phosphorous or phosphorous containing compounds, alkanolamine.
3. A method as claimed in claim 1 wherein the flame retardant solution includes monoethanolamine, ammonium and/or amine salts of acid phosphates.
4. A method as claimed in any one of the preceding claims wherein the flame retardant coating is cured at atmospheric temperature.
5. A method as claimed in any one of the preceding claims wherein the solution of protective material comprises a mix of bulan-1 -01 , butyl acetate, 1 -methoxypropan 2-01 and propan 1 -01 .
6. A method as claimed in claim 5 wherein concentrations of bulan-1 - 01 , butyl acetate, 1 -methoxypropan 2-01 and propan 1 -01 lie in the ranges 1 0 to 25%, 25 to 50%, 1 to 5% and 1 0 to 25 % respectively.
7. Glass treated by the method claimed in any one of the preceding claims.
8. A window assembly which comprises a frame, a first sheet of fire proofed glass mounted within the frame and a second sheet of thermally insulating glass mounted within the frame and spaced from the sheet of fire proofed glass, the internal surface of the second glass sheet being coated with sequential solutions of a flame retardant thermally insulating material and, after curing of the first coating, a solution of a material which, on drying, provides a solid coating having high integrity.
PCT/GB1999/003423 1998-11-06 1999-10-18 Flame retarded thermally insulated glass WO2000027769A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63508/99A AU6350899A (en) 1998-11-06 1999-10-18 Flame retarded thermally insulated glass

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9824264A GB2343390A (en) 1998-11-06 1998-11-06 Thermally insulated glass
GB9824264.7 1998-11-06

Publications (1)

Publication Number Publication Date
WO2000027769A1 true WO2000027769A1 (en) 2000-05-18

Family

ID=10841898

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/003423 WO2000027769A1 (en) 1998-11-06 1999-10-18 Flame retarded thermally insulated glass

Country Status (3)

Country Link
AU (1) AU6350899A (en)
GB (1) GB2343390A (en)
WO (1) WO2000027769A1 (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140528A1 (en) * 1970-08-12 1972-04-27 Ici Ltd Reinforced glass - by coating with halogen - contg complex aluminium phosphate also contng hydroxyl gps
US4008299A (en) * 1969-06-12 1977-02-15 James Derek Birchall Method of making a fibre of aluminium phosphate
US4552806A (en) * 1982-07-16 1985-11-12 Kabushiki Kaisha Toyota Chuo Kenkyusho Cellular glass coated with a heat insulator
GB2246136A (en) * 1990-07-18 1992-01-22 Prometheus Developments Ltd Intumescent coating compositions
CN1067637A (en) * 1992-07-08 1993-01-06 公安部四川消防科学研究所 Fire-proof glass with thin coating
DE4307631A1 (en) * 1993-03-11 1994-09-15 Bayer Ag Fire protection gels
EP0616021A1 (en) * 1991-08-13 1994-09-21 Bayer Ag Use of fire-proof gels for fire-resistant glazings
EP0712919A1 (en) * 1994-11-17 1996-05-22 Hoechst Aktiengesellschaft The use of synthetic silicates for fire-proof glasses
US5543230A (en) * 1990-07-21 1996-08-06 Bayer Aktiengesellschaft Laminated glass construction having an intermediate layer of a fire-proofing gel
US5573706A (en) * 1992-11-02 1996-11-12 Bayer Aktiengesellschaft Gel formers and gels, their preparation and use
US5709821A (en) * 1995-01-23 1998-01-20 Bayer Aktiengesellschaft Gel formers having reduced gelling time and forming gels with improved melting resistance

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB490581A (en) * 1937-11-20 1938-08-17 Emil Huber Method for the production of an electrical resistance
GB652766A (en) * 1948-04-13 1951-05-02 John Henry Pless Surface coatings

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008299A (en) * 1969-06-12 1977-02-15 James Derek Birchall Method of making a fibre of aluminium phosphate
DE2140528A1 (en) * 1970-08-12 1972-04-27 Ici Ltd Reinforced glass - by coating with halogen - contg complex aluminium phosphate also contng hydroxyl gps
US4552806A (en) * 1982-07-16 1985-11-12 Kabushiki Kaisha Toyota Chuo Kenkyusho Cellular glass coated with a heat insulator
GB2246136A (en) * 1990-07-18 1992-01-22 Prometheus Developments Ltd Intumescent coating compositions
US5543230A (en) * 1990-07-21 1996-08-06 Bayer Aktiengesellschaft Laminated glass construction having an intermediate layer of a fire-proofing gel
EP0616021A1 (en) * 1991-08-13 1994-09-21 Bayer Ag Use of fire-proof gels for fire-resistant glazings
CN1067637A (en) * 1992-07-08 1993-01-06 公安部四川消防科学研究所 Fire-proof glass with thin coating
US5573706A (en) * 1992-11-02 1996-11-12 Bayer Aktiengesellschaft Gel formers and gels, their preparation and use
DE4307631A1 (en) * 1993-03-11 1994-09-15 Bayer Ag Fire protection gels
EP0712919A1 (en) * 1994-11-17 1996-05-22 Hoechst Aktiengesellschaft The use of synthetic silicates for fire-proof glasses
US5709821A (en) * 1995-01-23 1998-01-20 Bayer Aktiengesellschaft Gel formers having reduced gelling time and forming gels with improved melting resistance

Also Published As

Publication number Publication date
AU6350899A (en) 2000-05-29
GB9824264D0 (en) 1998-12-30
GB2343390A (en) 2000-05-10

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