EP0668896A1 - Sealants - Google Patents

Sealants

Info

Publication number
EP0668896A1
EP0668896A1 EP93924744A EP93924744A EP0668896A1 EP 0668896 A1 EP0668896 A1 EP 0668896A1 EP 93924744 A EP93924744 A EP 93924744A EP 93924744 A EP93924744 A EP 93924744A EP 0668896 A1 EP0668896 A1 EP 0668896A1
Authority
EP
European Patent Office
Prior art keywords
sealant
sealant according
fire retardant
hydroxide
aluminium hydroxide
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP93924744A
Other languages
German (de)
French (fr)
Inventor
Guydo Rees Trahearn
Wolodymyr Iwan Hluchan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VISPAK Ltd
Original Assignee
VISPAK 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 VISPAK Ltd filed Critical VISPAK Ltd
Publication of EP0668896A1 publication Critical patent/EP0668896A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K21/00—Fireproofing materials
    • C09K21/14—Macromolecular materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K3/1006—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by the chemical nature of one of its constituents
    • C09K3/1018—Macromolecular compounds having one or more carbon-to-silicon linkages
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2003/1034—Materials or components characterised by specific properties
    • C09K2003/1037—Intumescent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2003/1034—Materials or components characterised by specific properties
    • C09K2003/1078—Fire-resistant, heat-resistant materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/02—Inorganic compounds
    • C09K2200/0217—Salts
    • C09K2200/023—Sulfur-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/02—Inorganic compounds
    • C09K2200/0239—Oxides, hydroxides, carbonates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/02—Inorganic compounds
    • C09K2200/0269—Ceramics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/02—Inorganic compounds
    • C09K2200/0273—Boron-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/04—Non-macromolecular organic compounds
    • C09K2200/0441—Carboxylic acids, salts, anhydrides or esters thereof

Definitions

  • the invention relates to a sealant which is silicone based and has non-setting and fire-retarding and intumescing properties.
  • fire retarding sealants may be placed around pipes, cables and service penetrations in walls, floors and ceilings. However, such sealants may prevent access for servicing purposes.
  • the invention provides a sealant comprising a silicone resin, a filler, a ceramic fire retardant, a smoke suppressant, and either aluminium hydroxide or magnesium hydroxide.
  • the sealant according to the invention has intumescent properties derived from the aluminium or magnesium hydroxide. Its fire retarding properties are enhanced by the inclusion of the ceramic fire retardant, which is preferably zinc borate.
  • the preferred hydroxide is aluminium hydroxide. At a temperature of about 200°C, this compound decomposes to form aluminium oxide and steam, the latter causing the sealant to intumesce while being relatively harmless to people. The aluminium oxide and zinc borate form a crust on the intumesced sealant providing a further fire retardant property. At the temperatures encountered in fires, the magnesium hydroxide behaves in a corresponding manner.
  • the sealant according to the invention being placed in the service penetration, will thus intumesce upon exposure to heat in a fire, effectively sealing any spaces in the penetration which would allow fire and smoke to pass into another contained area. Since the sealant is non-setting, nowever, it can oe removed after installation for servicing purposes. Furtnernore the sealant is solvent free and halogen free and will not evolve halogen gases upon intumescence.
  • the sealant according to the invention preferably contains a minimum of 30% by weight of the heat-curing silicone resin, and 10 to 20% by weight of filler.
  • the silicone resin used is commercially available as silicone gum.
  • the silicone gum may have a molecular weight of about 250000 to 550000 and a penetration test value of about 600 to 900.
  • Other silicone resins may be used in tne compounding of the sealant. Although many fillers could be used, dolomite is preferred on the grounds of whiteness and economy.
  • the aluminium hydroxide preferably constitutes up to 40% by weight of the sealant.
  • the amount of intumescence increases with the amount of aluminium hydroxide.
  • the sealant according to the invention may further contain any additives customarily included in such compositions. These may include surfactants, plasticisers, preservatives, pigments, toolability (shaping and forming) improvers and rheology modifiers. So called “high pressure" intumescent products, such as activated graphite and sodium silicate, may also be added.
  • a luminous pigment such as copper-activated zinc sulphide.
  • This pigment luminesces in the absence of light, and may act as a visual identification of the grade of sealant to building inspectors and fire prevention officers, both on initial and subsequent inspections.
  • the invention is illustrated by the following Examples:
  • Example 1 A fire retardant intumescent non-setting seal ant was prepared by compounding the following substances in a Narben mixer :
  • the stearate coated carbonate is a smoke suppressant and rheology modifier to prevent slump of the product.
  • the zinc borate is fire retarding enhancing the fire retardant properties of the compound.
  • the composition is a non-setting, hand malleable paste capable of extrusion into rope form or custom profiled forms. It had a Smoke Index of 23 as determined according to Naval Engineering Standard 711, Isse 2 and a Toxicity Index of 0.19 as determined by Naval Engineering Standard 713, Issue 3.
  • a fire retardant intumescent luminous non-setting sealant was prepared as described in Example 1, but to the following composition:
  • the copper activated zinc sulphide pigment provides luminosity to the composition.
  • the inclusion of the copper activated zinc sulphide does not affect the properties or performance as detailed in Example 1.

Abstract

A fire retarding sealant comprises a silicone resin, a filler, a ceramic fire retardant such as zinc borate, a smoke suppressant such as stearate coated calcium hydroxide, and either aluminium hydroxide or magnesium hydroxide, preferably the former. The sealant is intumescent, and non-setting, and is intended for placement around pipes, cables and service penetrations in walls, floors and ceilings. At the temperatures encountered in fires, the aluminium hydroxide decomposes to form aluminium oxide and steam, the latter causing the sealant to intumesce while being relatively harmless to people (no halogen gases are evolved). The aluminium oxide and zinc borate form a crust on the intumesced sealant, providing a further fire retardant property.

Description

TITLE
Sealants
DESCRIPTION
The invention relates to a sealant which is silicone based and has non-setting and fire-retarding and intumescing properties.
It is known that fire retarding sealants may be placed around pipes, cables and service penetrations in walls, floors and ceilings. However, such sealants may prevent access for servicing purposes.
The invention provides a sealant comprising a silicone resin, a filler, a ceramic fire retardant, a smoke suppressant, and either aluminium hydroxide or magnesium hydroxide.
The sealant according to the invention has intumescent properties derived from the aluminium or magnesium hydroxide. Its fire retarding properties are enhanced by the inclusion of the ceramic fire retardant, which is preferably zinc borate. The preferred hydroxide is aluminium hydroxide. At a temperature of about 200°C, this compound decomposes to form aluminium oxide and steam, the latter causing the sealant to intumesce while being relatively harmless to people. The aluminium oxide and zinc borate form a crust on the intumesced sealant providing a further fire retardant property. At the temperatures encountered in fires, the magnesium hydroxide behaves in a corresponding manner.
The sealant according to the invention, being placed in the service penetration, will thus intumesce upon exposure to heat in a fire, effectively sealing any spaces in the penetration which would allow fire and smoke to pass into another contained area. Since the sealant is non-setting, nowever, it can oe removed after installation for servicing purposes. Furtnernore the sealant is solvent free and halogen free and will not evolve halogen gases upon intumescence.
The sealant according to the invention preferably contains a minimum of 30% by weight of the heat-curing silicone resin, and 10 to 20% by weight of filler. The silicone resin used is commercially available as silicone gum. The silicone gum may have a molecular weight of about 250000 to 550000 and a penetration test value of about 600 to 900. Other silicone resins may be used in tne compounding of the sealant. Although many fillers could be used, dolomite is preferred on the grounds of whiteness and economy.
The aluminium hydroxide preferably constitutes up to 40% by weight of the sealant. The amount of intumescence increases with the amount of aluminium hydroxide.
The sealant according to the invention may further contain any additives customarily included in such compositions. These may include surfactants, plasticisers, preservatives, pigments, toolability (shaping and forming) improvers and rheology modifiers. So called "high pressure" intumescent products, such as activated graphite and sodium silicate, may also be added.
It is especially preferred to add a luminous pigment suchas copper-activated zinc sulphide. This pigment luminesces in the absence of light, and may act as a visual identification of the grade of sealant to building inspectors and fire prevention officers, both on initial and subsequent inspections. The invention is illustrated by the following Examples:
Example 1 A fire retardant intumescent non-setting seal ant was prepared by compounding the following substances in a Narben mixer :
% bv weight alpna, omega - divinylpolydimethylsiloxane,
or alpha, omega - dimethylpolydimethylsiloxane 30.175
Aluminium hydroxide 31.228
Stearate coated calcium carbonate 3.772
Dolomite 17.544
Zinc borate 12.281
100.000
In this composition, the stearate coated carbonate is a smoke suppressant and rheology modifier to prevent slump of the product. The zinc borate is fire retarding enhancing the fire retardant properties of the compound.
The composition is a non-setting, hand malleable paste capable of extrusion into rope form or custom profiled forms. It had a Smoke Index of 23 as determined according to Naval Engineering Standard 711, Isse 2 and a Toxicity Index of 0.19 as determined by Naval Engineering Standard 713, Issue 3.
The following results have been obtained by testing according to the stated British Standards:
BS 476 Part 6 (1989) Class '0' BS 476 Part 7 (1987) Class '2' BS 476 Part 20 (1987) 4 hours BS 6853 (1987) Appendix A - Clause A.9 < 350°C
BS 6853 (1987) Aooendix B - Clause B.5.1 Ao O.029
BS 5853 (1987 ) Appendix B - Clause B.5.2 Ao(ON)3.20;
Ao(OFF) 3.55
Example 2
A fire retardant intumescent luminous non-setting sealant was prepared as described in Example 1, but to the following composition:
% by weight alpha, omega - divinylpolydimethylsiloxane,
or alpha, omega - dimethylpolvdimethvlsiloxane 30.175
Aluminium hydroxide 31.228
Stearate coated calcium carbonate 8.772
Iclomite 15.544 line berate 12.281
Copper activated zinc sulphide 2.000
100.000
The copper activated zinc sulphide pigment provides luminosity to the composition. The inclusion of the copper activated zinc sulphide does not affect the properties or performance as detailed in Example 1.

Claims

sealant comprising a silicone resin, a filler,a ceramic fire retardant, a smoke suppressant, and an intumescent compound which is either aluminium hydroxide or magnesium hydroxide.
2. A sealant according to claim 1 in which the intumescent compound is aluminium hydroxide.
3. A sealant according to claim 2 containing up to 40% of aluminium hydroxide.
4. A sealant according to any preceding claim in which the ceramic fire retardant is zinc borate.
5. A sealant according to any preceding claim containing at least 30% by weight of the silicone resin
5. A sealant according to any preceding claim containing from 10% to 20% by weight of the filler.
7. A sealant according to any preceding claim m which the smoke suppressant is stearate coated calcium carbonate.
3. A sealant according to any preceding claim further comprising one or more of a surfactant, a plasticiser, a preservative, a pigment, a toolability improver and a rheology modifier.
9. A sealant according to any preceding claim furtner comprising activated graphite or sodium silicate as a nigh pressure intumescent additive.
10. A sealant according to any preceding claim furtner comprising copper activated zinc sulphide as a luminous pigment.
EP93924744A 1992-11-11 1993-11-11 Sealants Withdrawn EP0668896A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9223636 1992-11-11
GB929223636A GB9223636D0 (en) 1992-11-11 1992-11-11 Sealants
PCT/GB1993/002321 WO1994011455A1 (en) 1992-11-11 1993-11-11 Sealants

Publications (1)

Publication Number Publication Date
EP0668896A1 true EP0668896A1 (en) 1995-08-30

Family

ID=10724909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93924744A Withdrawn EP0668896A1 (en) 1992-11-11 1993-11-11 Sealants

Country Status (7)

Country Link
EP (1) EP0668896A1 (en)
JP (1) JPH08503501A (en)
AU (1) AU669593B2 (en)
CA (1) CA2149018A1 (en)
FI (1) FI952270A (en)
GB (1) GB9223636D0 (en)
WO (1) WO1994011455A1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2289271B (en) * 1994-05-09 1998-01-14 Environmental Seals Ltd Intumescent compositions
DE4437596A1 (en) † 1994-10-20 1996-04-25 Daetwyler Ag Flame-resistant composition for the production of electrical cables with insulation and / or functional integrity
ES2117543B1 (en) * 1995-06-06 1999-04-01 Fundacion Gaiker FIREPROOF MATERIAL.
DE69633699D1 (en) * 1995-07-31 2004-12-02 Gen Electric Flame retardant polymer compositions
CA2213086A1 (en) 1997-10-02 1999-04-02 Martin J. Lilley Processing and use of carbide lime by-product as a resin and polymer filler and extender
JP4620823B2 (en) * 2000-02-04 2011-01-26 株式会社共和 Flame retardant sealing material
US20030038272A1 (en) 2001-08-24 2003-02-27 Figiel Edmund W. Fire retardant foam and gel compositions
WO2005103203A1 (en) * 2004-04-20 2005-11-03 Yazaki Corporation Flame retardant
CN101302343A (en) * 2008-07-10 2008-11-12 天津市凯华绝缘材料有限公司 Flame-retardant organosilicon powder encapsulating material for electronic component
KR101336028B1 (en) * 2012-05-24 2013-12-03 덕유패널 주식회사 Composition of sealant for pipe sealing
WO2014196940A2 (en) * 2013-06-03 2014-12-11 Yeditepe Universitesi Boron added antimicrobial joint sealant
GB2522172B (en) * 2013-09-27 2018-05-23 Intumescent Systems Ltd Fire retardant sealing apparatus
ES1154435Y (en) * 2016-02-26 2016-07-11 Barreiro Celso Rodriguez ADHESIVE SEALER TO JOIN OR CREATE JOINTS
GB2567621B (en) * 2017-10-10 2022-07-27 Polyseam Ltd Composition and method of sealing a service penetration

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55152723A (en) * 1979-05-18 1980-11-28 Hitachi Cable Ltd Preparation of fire-proof silicone foam
JPS6022017B2 (en) * 1981-10-14 1985-05-30 信越化学工業株式会社 Flame-resistant silicone rubber composition
GB2193216B (en) * 1986-07-28 1991-03-20 Gen Electric Zinc borate as a smoke suppressant
US4889878A (en) * 1988-04-15 1989-12-26 Dow Corning Corporation Flowable joint sealant for concrete highway
US4952615A (en) * 1988-05-13 1990-08-28 Minnesota Mining And Manufacturing Company Compressible fireproof seal
US4962151A (en) * 1989-06-22 1990-10-09 Dow Corning Corporation Silicone sealant compositions
FR2659342B1 (en) * 1990-03-08 1994-03-18 Rhone Poulenc Chimie AQUEOUS DISPERSION BASED ON CROSSLINKING SILICON OILS, BY ELIMINATION OF WATER IN A FLAME RESISTANT ELASTOMER.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9411455A1 *

Also Published As

Publication number Publication date
AU669593B2 (en) 1996-06-13
AU5429494A (en) 1994-06-08
WO1994011455A1 (en) 1994-05-26
FI952270A0 (en) 1995-05-10
GB9223636D0 (en) 1992-12-23
FI952270A (en) 1995-05-10
JPH08503501A (en) 1996-04-16
CA2149018A1 (en) 1994-05-26

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