WO2001044137A1 - Procede de fabrication d'un materiau thermoisolant/ignifuge - Google Patents

Procede de fabrication d'un materiau thermoisolant/ignifuge Download PDF

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Publication number
WO2001044137A1
WO2001044137A1 PCT/IB2000/001860 IB0001860W WO0144137A1 WO 2001044137 A1 WO2001044137 A1 WO 2001044137A1 IB 0001860 W IB0001860 W IB 0001860W WO 0144137 A1 WO0144137 A1 WO 0144137A1
Authority
WO
WIPO (PCT)
Prior art keywords
fire retardant
heat insulating
retardant material
reaction mixture
heat
Prior art date
Application number
PCT/IB2000/001860
Other languages
English (en)
Inventor
Jan Abraham Weyers
Original Assignee
Jan Abraham Weyers
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 Jan Abraham Weyers filed Critical Jan Abraham Weyers
Priority to AU17237/01A priority Critical patent/AU1723701A/en
Publication of WO2001044137A1 publication Critical patent/WO2001044137A1/fr

Links

Classifications

    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/10—Clay
    • 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
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures

Definitions

  • THIS INVENTION relates to heat insulation.
  • it relates to a method of manufacturing a heat insulating/fire retardant material, to a heat insulating/fire retardant material and to an artefact including the heat insulating/fire retardant material.
  • a method of manufacturing a heat insulating/fire retardant material which method includes the steps of forming a reaction mixture by mixing together colloidal silica, a sodium-containing clay and water and allowing the reaction mixture to react for a sufficient time to form the heat insulating/fire retardant material.
  • heat insulating material should be interpreted broadly to include heat dissipating material.
  • the colloidal silica may be silica dispersed in a silica sol.
  • the colloidal silica may have a specific surface area to concentration ratio of 300/30% .
  • a colloidal silica having a specific surface area to concentration ratio of 200/30% may also be used but with much lower heat resistance.
  • the colloidal silica may be, for example, the colloidal silica sold under the trade name "LEVASIL" by BAYER A.G . (Germany) .
  • the sodium-containing clay may be a sodium-rich clay such as attapulgite, montmorillonite, or the like.
  • the montmorillonite may be a powder having a pH which is equal to or greater than 1 0.2. Preferably, the pH is about 1 0.5.
  • the montmorillonite powder may be the montmorillonite powder sold by GW BASE AND INDUSTRIAL MINERALS (South Africa) under the trade name "ENVIROBENT" .
  • the attapulgite may be that sold by G W BASE AND INDUSTRIAL MINERALS (SOUTH
  • AFRICA under the trade name "ATTAPULGITE” .
  • the water is preferably distilled water or otherwise purified water.
  • the reaction mixture may be formed using 3-8% m/m colloidal silica, 8-1 5% m/m sodium-containing clay and 77%-89% m/m water.
  • the reaction mixture is formed using 3-5% m/m colloidal silica, 8-1 2% m/m sodium-containing clay and 83%-89% m/m water. Even more preferably, the mixture is formed by mixing together 3% m/m colloidal silica, 1 2% m/m sodium-containing clay and 85 % m/m water.
  • the reaction mixture may have a pH in the range 8-9.
  • the pH of the reaction mixture is 8.6.
  • the reaction mixture may be formed by optionally mixing together a silicon-containing polymer, and a suitable dye, in addition to the colloidal silica, the sodium-containing clay and water.
  • the silicon - containing polymer may be a silicone polymer.
  • the silicone polymer is in the form of a curable aqueous emulsion. It may be a 60% non-ionic aqueous silicone emulsion of a reactive dimethyl silicone polymer, for example, the product sold under the trade name "SM 2138(E)" or a 35% anionic aqueous silicone emulsion of a high viscosity silanol fluid made by emulsion polymerisation, for example, the product sold under the trade name "SM
  • the reaction mixture used to form the emulsion may contain an emulsifier, for example, 1 % m/m of the emulsifier sold as "CRILLET 1 " by Croda Chemicals (United Kingdom).
  • an emulsifier for example, 1 % m/m of the emulsifier sold as "CRILLET 1 " by Croda Chemicals (United Kingdom).
  • gel is meant a jellylike apparently solid colloidal solution.
  • emulsion is meant a colloidal suspension of one liquid in another.
  • the heat insulating/fire retardant emulsion is lighter than the heat insulating/fire retardant gel.
  • An alternative curable silicon-containing polymer which can be used is a silicone emulsion containing 35% phenyl fluid such as PH300 or PN200, 3.5% emulsifier such as "RENEX 36"(ICI) and balance water.
  • This silicone emulsion has a higher temperature range than the silicone emulsions mentioned above, however, it is significantly more expensive.
  • the method may include pre-mixing the aqueous silicone emulsion and the water.
  • the method may include first heating the water.
  • the water is pre-heated to a temperature of between 40 °C and 60 °C.
  • the water is heated to a temperature of about 60°C.
  • the reaction mixture may be formed using 3-8% m/m silicon-containing polymer and 0.1 -0.2% m/m dye.
  • the mixture is formed using 3-5% m/m silicon-containing polymer and 0.1 -
  • the mixture is formed using 3% m/m silicon-containing polymer and 0.1 % m/m dye.
  • the dye may be methylene blue.
  • the invention extends to a heat insulating/fire retardant material whenever manufactured in accordance with the method as hereinbefore described .
  • the invention extends to a heat insulating/fire retardant material which includes an admixture of colloidal silica, a sodium- containing clay and water.
  • the heat insulating/fire retardant material optionally further includes a silicon-containing polymer and a suitable dye.
  • the colloidal silica, the sodium-containing clay, the silicon- containing polymer and the dye, and their relative proportions may be as hereinbefore described.
  • the heat insulating/fire retardant and heat dissipating material of the invention may be used in a range of heat insulating/fire retardant and heat dissipating applications. It may for example be used as a heat barrier or heat shield to protect a surface, typically by smearing the gel to a thickness of 6- 1 Omm over the area to be protected, the quantity of gel required being dependent on the heat being applied and the thickness of the area being protected .
  • the invention extends to a method of protecting a surface by applying the heat insulating/fire retardant material as hereinbefore described to at least part of the surface.
  • an artefact which includes a body defining a panel encapsulating a heat insulating/fire retardant material as hereinbefore described .
  • the panel may include a front wall and a rear wall and a number of longitudinal passages or flutes extending end-to-end therebetween, within which the heat insulating/fire retardant material is encapsulated .
  • the panel may be an extrusion of polypropylene or polyethylene.
  • the artefact is used as a heat barrier between engine and passenger compartments in vehicles and as a heat barrier in building and construction applications.
  • a heat insulating/fire retardant gel according to the invention was manufactured by the method described below.
  • Water (81 .6% m/m) at approximately 60°C, montmorillonite powder (1 2% m/m) having a pH of 1 0.5, a curable silicone polymer in the form of a curable 60% non-ionic aqueous silicone emulsion (3% m/m), colloidal silica (3% m/m) and methylene blue (0.1 % m/m) were combined in the following manner.
  • the water was first added to a twin-speed mixer and the mixer was operated at a low speed (700rpm) .
  • the mixer used was a twin propeller stainless steel shear type mixer.
  • the methylene blue dye was slowly added to the water while the mixer was still running.
  • the silicone emulsion and the colloidal silica were then slowly added to the methylene blue and water mixture.
  • the mixer was operated at the low speed
  • the mixer was operated at a high speed ( 1 400rpm) for approximately 1 5 seconds in order to disintegrate the lumps.
  • the process was repeated viz. a visual check for lumps was conducted and the mixer was operated at a high speed (1400rpm) for approximately 1 5 seconds until all lumps present in the slurry disintegrated . Thereafter, the mixer was operated at a high speed ( 1400rpm) until a smooth jelly-like substance formed .
  • the mixture was then allowed to stand for approximately 1 to 2 days during which a gas evolved. Thereafter the jelly-like slurry was decanted into 50kg buckets and left open to enable any further gas to evolve. The buckets were sealed after approximately 2 days. It was observed that the jelly-like slurry changed into a gel after approximately 3-6 hours.
  • the montmorillonite was that sold by GW BASE AND
  • Example 1 was repeated using a different curable silicone polymer viz. the curable silicone polymer sold in the form of a 35% anionic aqueous silicone emulsion under the trade name "SM2068(A)(2068E)" by GE BAYER SILICONES GMBH & CO. KG . (Germany) .
  • An emulsifier ( 1 % m/m), sold under the trade name "CRILLET 1 " by Croda Chemicals (United Kingdom), was also added to the reaction mixture together with the silicone emulsion.
  • the method used was the same as that used in Example 1 except that once all lumps disintegrated, the mixer was operated at a high speed ( 1400rmp) until the mixture started to froth. Instead of being a gel, the final product was an emulsion.
  • reference numeral 1 0 generally indicates an artefact in accordance with the invention.
  • the artefact 1 0 includes a body which defines a panel 1 2.
  • the panel 1 2 has a front wall 14 and a rear wall 1 6 and a number of passages or flutes 1 8 extending end-to-end between the walls 1 6, 1 8.
  • the panel 1 2 encapsulates the heat insulating/fire retardant material manufactured in accordance with Example 1 within the passages 1 8.
  • the ends of the passages 1 8 are sealed by a sealing method whereby plugs made of a compatible material are ultrasonically welded into each end of the passages. Alternatively, the ends of the passages 1 8 are sealed by means of mechanically bonding the panel material under pressure and heat.
  • the panel 1 2 is a polypropylene extrusion and is sold in South Africa under the trade name
  • a sample of the panel 1 2 having a thickness of 8mm, an area of 1 m , and a mass of 2400g/m was subjected to the following test.
  • the panel 1 2 was exposed to an oxy-acetylene torch flame having a temperature of approximately 3000°C. Photographs of the panel were taken every 30 seconds for evaluation purposes. The flame took 7 minutes to burn through the panel 1 2 without ignition of the panel 1 2 occurring .
  • the panel 1 2 encapsulating sand instead of the gel of the invention was exposed to the oxy-acetylene torch flame. The result was that the panel 1 2 ignited after about 10 seconds and the flame burnt through after about 60 seconds. Because of the rapid ignition that took place, photographs of the panel were taken at 20 second intervals.
  • the panel 1 2 was exposed to a controlled oven temperature of 200 °C for a period of one hour. No deformation, melt-down or ignition took place.
  • the panel 1 2 was exposed to a naked flame having a temperature of 3000°C for a period of 25 seconds before isolated ignition and flame commenced .
  • the flame was limited to the area of flame impingement without spread.
  • the panel 1 2 passed the REI 1 00, REI 200 and REI 300 tests.
  • the Applicant believes that it is an advantage of the invention that it provides a heat insulating/fire retardant or fire resistant material in the form of either a gel or an emulsion which can be used in a range of heat resistant applications.
  • the heat insulating/fire retardant material can be
  • the material is used as a lubricant when slipping the cable within the conduit. After the slip process has been completed, the ends of the cable are sealed to ensure air tightness;
  • the heat insulating/fire retard ant material can be used for the protection of operatives when working in a hot environment; thus the material can be used in conjunction with specially designed protection gloves when handling hot or very hot materials or for the protection of hands, arms, upper body, etc. when working in a hot environment.
  • hot environments occur in the glass, ceramic, metallurgical, chemical, foundry and automotive (exhaust repair) industries; the material can also be used to enhance the performance of existing protective clothing for operating personnel where the risk of exposure to a high temperature environment is considered particulary high, for example, firemen, rescue workers, electricity supplies workers etc.
  • the objective is to protect the hands from the effect of touching hot surfaces and protect the body (including the hands) from the general effects of radiant heat.
  • Operatives working in hot environments typically wear protective clothing consisting of overalls, aprons, leggings, heavy-duty boots, gloves, hoods, balaclava's etc.
  • This clothing is manufactured using various heat-resisting materials such as Du Pont's "KEVLAR" (registered trade mark) .
  • heat insulating/fire retardant material of the invention By the use of the heat insulating/fire retardant material of the invention, it is possible to significantly enhance the performance of industrial clothing and, thus, improve working conditions and safety.
  • the heat insulating/fire retardant material also allows operatives to work more efficiently in demanding situations with high operating temperatures.
  • "KEVLAR" registered trade mark
  • a knitted glove construction with a fairly tight cuff around the wrist and forearm may be used. This facilitates impregnation with the material.
  • a cuff length above the wrist of about 200mm may be used.
  • the invention provides an artefact in the form of a panel which panel encapsulates the heat insulating/fire retardant material of the invention which can be used, for example, as a heat barrier between the engine and the passenger compartments in motor vehicles, to encapsulate a motor vehicle battery within its battery compartment, to provide a heat barrier within the walls of safes in order to neutralise the effect of cutting torches, and as a heat barrier in building and construction applications.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Civil Engineering (AREA)
  • Building Environments (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un matériau thermoisolant/ignifuge, consistant à former un mélange de réaction par mélange de silice colloïdale, d'une argile contenant du sodium, et d'eau, et à laisser réagir le mélange de réaction sur une durée suffisante pour permettre la formation du matériau thermoisolant/ignifuge sous forme de gel ou d'émulsion. Le mélange de réaction peut également contenir un polymère contenant du silicium et un colorant adapté. Ledit matériau thermoisolant/ignifuge peut être utilisé en tant que barrière thermique ou écran thermique. Un artefact (10) comporte un élément définissant un panneau renfermant le matériau thermoisolant/ignifuge, et peut être utilisé en tant que barrière thermique ou écran thermique.
PCT/IB2000/001860 1999-12-14 2000-12-13 Procede de fabrication d'un materiau thermoisolant/ignifuge WO2001044137A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU17237/01A AU1723701A (en) 1999-12-14 2000-12-13 Method of manufacturing a heat insulating/fire retardant material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA997678 1999-12-14
ZA99/7678 1999-12-14

Publications (1)

Publication Number Publication Date
WO2001044137A1 true WO2001044137A1 (fr) 2001-06-21

Family

ID=25588038

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2000/001860 WO2001044137A1 (fr) 1999-12-14 2000-12-13 Procede de fabrication d'un materiau thermoisolant/ignifuge

Country Status (3)

Country Link
AU (1) AU1723701A (fr)
WO (1) WO2001044137A1 (fr)
ZA (1) ZA200106705B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102516713A (zh) * 2011-11-18 2012-06-27 常州南京大学高新技术研究所 一种用于环氧树脂的有机硅系粘土基复合阻燃剂及其制法
WO2016133597A1 (fr) * 2015-02-17 2016-08-25 Doten Leonard E Système de préparation de gel polymère modulaire pour aéronef
CN111232991A (zh) * 2020-04-08 2020-06-05 天津纳科世纪新材料有限公司 特殊结构的二氧化硅气凝胶球形粉体及其制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5659665A (en) * 1979-10-22 1981-05-23 Ibigawa Electric Ind Co Ltd Inorganic fiber formed body and manufacture thereof
JPS56151544A (en) * 1980-04-28 1981-11-24 Tokuji Iwasaki Mamufacture of light fireproof heat-insulating board containing wooden fiber, chip, powder and vegetable fiber as principal materials
JPS56155073A (en) * 1980-04-28 1981-12-01 Tokuji Iwasaki Manufacture of non-baked, self-hardening, lightweight, fire-resistant and heat-insulating molded brick and formless, lightweight, fire-resistant and heat-insulating castable
EP0205281A2 (fr) * 1985-06-10 1986-12-17 Corning Glass Works Gels, produits à base de ces gels et procédé pour les préparer
US5084320A (en) * 1990-01-22 1992-01-28 Barito Robert W Evacuated thermal insulation
DE29800864U1 (de) * 1998-01-20 1998-03-12 Culimeta Alfons Cuylits Ges Fu Mikroporöse Wärmedämmplatte

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5659665A (en) * 1979-10-22 1981-05-23 Ibigawa Electric Ind Co Ltd Inorganic fiber formed body and manufacture thereof
JPS56151544A (en) * 1980-04-28 1981-11-24 Tokuji Iwasaki Mamufacture of light fireproof heat-insulating board containing wooden fiber, chip, powder and vegetable fiber as principal materials
JPS56155073A (en) * 1980-04-28 1981-12-01 Tokuji Iwasaki Manufacture of non-baked, self-hardening, lightweight, fire-resistant and heat-insulating molded brick and formless, lightweight, fire-resistant and heat-insulating castable
EP0205281A2 (fr) * 1985-06-10 1986-12-17 Corning Glass Works Gels, produits à base de ces gels et procédé pour les préparer
US5084320A (en) * 1990-01-22 1992-01-28 Barito Robert W Evacuated thermal insulation
DE29800864U1 (de) * 1998-01-20 1998-03-12 Culimeta Alfons Cuylits Ges Fu Mikroporöse Wärmedämmplatte

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 198128, Derwent World Patents Index; Class L02, AN 1981-50524D, XP002163865 *
DATABASE WPI Section Ch Week 198201, Derwent World Patents Index; Class L02, AN 1982-00818E, XP002163867 *
DATABASE WPI Section Ch Week 198202, Derwent World Patents Index; Class F09, AN 1982-03033E, XP002163866 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102516713A (zh) * 2011-11-18 2012-06-27 常州南京大学高新技术研究所 一种用于环氧树脂的有机硅系粘土基复合阻燃剂及其制法
WO2016133597A1 (fr) * 2015-02-17 2016-08-25 Doten Leonard E Système de préparation de gel polymère modulaire pour aéronef
US10046186B2 (en) 2015-02-17 2018-08-14 Leonard E. Doten Modular polymer gel preparation system for aircraft
CN111232991A (zh) * 2020-04-08 2020-06-05 天津纳科世纪新材料有限公司 特殊结构的二氧化硅气凝胶球形粉体及其制备方法
CN111232991B (zh) * 2020-04-08 2022-05-20 天津纳科世纪新材料有限公司 特殊结构的二氧化硅气凝胶球形粉体及其制备方法

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Publication number Publication date
AU1723701A (en) 2001-06-25
ZA200106705B (en) 2002-03-01

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