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Ceramic-able room-temperature vulcanized organic silicone sealant capable of retarding flame and inhibiting smoke and preparation method thereof

A room temperature vulcanization and ceramicization technology, which is applied in the direction of adhesives, inorganic adhesives, non-polymer adhesive additives, etc., can solve the problems of glass curtain wall falling off, chemical reaction, and inability to form a firm bonding interface. Achieve the effects of preventing large-scale peeling, low smoke density, and reducing secondary damage

Active Publication Date: 2019-03-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the existing organic silicon sealant which can only realize ceramicization itself, and the obtained ablation product cannot chemically react with the substrate to be bonded (such as glass or aluminum alloy), and cannot form a firm bonding interface , the problem that the purpose of preventing the glass curtain wall from falling off cannot be achieved, and a flame-retardant and smoke-suppressing ceramizable room temperature vulcanized silicone sealant and its preparation method are provided. The silicone sealant can be ablated at high temperature to obtain a dense structure. A ceramic product with high porcelain strength, closely connected with the base material, and has the function of flame retardancy and smoke suppression

Method used

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  • Ceramic-able room-temperature vulcanized organic silicone sealant capable of retarding flame and inhibiting smoke and preparation method thereof
  • Ceramic-able room-temperature vulcanized organic silicone sealant capable of retarding flame and inhibiting smoke and preparation method thereof
  • Ceramic-able room-temperature vulcanized organic silicone sealant capable of retarding flame and inhibiting smoke and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In terms of mass percentage, the raw material composition ratio of the flame-retardant and smoke-suppressing ceramizable room-temperature-curable sealant is:

[0039]

[0040] During preparation, add calcium borate and hectorite into the crucible, stir at 600°C for 1 hour, and stir at a speed of 50r·min -1 , so that the surface layer of calcium borate is melted, and part of hectorite is adhered to form a ceramic precursor containing silicon-boron covalent bonds. Mix α,ω-dihydroxy polydimethylsiloxane with viscosities of 1500 and 200000mPa·s at 25°C in a mass ratio of 6:1, add them to the kneader, and then add fumed silica, silicon-containing Boron covalent bond ceramic precursor, molybdenum disulfide, set temperature 110°C, vacuum degree 0.05MPa, rotation speed 300r min -1 , blended for 240 minutes, fully dehydrated the raw materials, cooled to 30 ~ 40 ° C to obtain the base material; put the base material into the planetary mixer, and then added ethyl orthosilicate...

Embodiment 2

[0042] In terms of mass percentage, the raw material composition ratio of the flame-retardant and smoke-suppressing ceramizable room-temperature-curable sealant is:

[0043]

[0044] During preparation, magnesium borate and pyrophyllite were added to the crucible, stirred at 900°C for 3 hours, and the stirring speed was 80r·min -1 , so that the surface layer of magnesium borate is melted, and part of the pyrophyllite is adhered to form a ceramic precursor containing silicon-boron covalent bonds. Mix α,ω-dihydroxy polydimethylsiloxane with viscosities of 200 and 20000mPa·s at 25°C according to the mass ratio of 4:1, add to the kneader, and then add precipitated white carbon black, containing silicon -Boron covalent bond ceramic precursor, molybdenum disulfide, set temperature 160°C, vacuum degree 0.05MPa, rotation speed 400r min -1 , blended for 180 minutes, fully dehydrated the raw materials, cooled to 30 ~ 40 ° C to obtain the base material; put the base material into the...

Embodiment 3

[0046] In terms of mass percentage, the raw material composition ratio of the flame-retardant and smoke-suppressing ceramizable room-temperature-curable sealant is:

[0047]

[0048] During preparation, add barium metaborate and laponite into the crucible, stir at 700°C for 3 hours, and stir at a speed of 80r·min -1 , so that the surface layer of barium metaborate melts and adheres to part of hectorite to form a ceramic precursor containing silicon-boron covalent bonds. Mix α,ω-dihydroxypolydimethylsiloxane with viscosities of 2000 and 100000mPa·s at 25°C in a mass ratio of 5:1, add them to the kneader, and then add nano-calcium carbonate, silicon-containing Boron covalent bond ceramic precursor, molybdenum disulfide, set temperature 160°C, vacuum degree 0.10MPa, rotation speed 400r min -1 , blended for 90 minutes, fully dehydrated the raw materials, cooled to 30-40°C to obtain the base material; put the base material into the planetary mixer, and then added methyl tributy...

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Abstract

The invention discloses ceramic-able room-temperature vulcanized organic silicone sealant capable of retarding flame and inhibiting smoke and a preparation method thereof. The organic silicone sealantis composed of, by mass, 40-70% of silicone rubber, 5-30% of a reinforcing agent, 10-40% of porcelainized filler, 3-10% of a fluxing agent, 1-5% of a flame-retarding and smoke-inhibiting agent, 1-10%of a coupling agent, 1-5% of a catalyst, and 1-10% of a crosslinking agent. The preparation method includes: stirring the fluxing agent and the porcelainized filler at 500-900 DEG C until the surfacelayer of the fluxing agent is melted and a part of the porcelainized filler is adhered; then dehydrating a mixture of the silicone rubber substrate, the reinforcing agent, a ceramic-forming precursor, and the flame-retarding and smoke-inhibiting agent to prepare a base material; mixing and stirring the base material with the crosslinking agent, the catalyst and the coupling agent. If ablation temperature is higher than 800 DEG C, a reaction product containing a Si-B-Al bond can be generated at the binding interface between the ceramic material and a glass curtain wall, so that stripping of the glass curtain wall at high temperature can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of fire prevention and flame retardancy of silicone sealants, in particular to a flame-retardant and smoke-suppressing ceramizable room-temperature-vulcanized silicone sealant and a preparation method thereof. Background technique [0002] With the rapid development of my country's construction industry, the number of high-rise buildings continues to increase, and the requirements for building fire protection levels continue to increase. As a silicone sealant for bonding glass curtain walls or aluminum alloy profiles, it also puts forward higher requirements for flame retardancy. At present, for the existing commercialized flame-retardant silicone sealants, a large number of inorganic flame retardants such as aluminum hydroxide, magnesium hydroxide, and zinc borate are generally used to achieve the flame-retardant effect. On the one hand, this method will cause mechanical damage to the sealant. On the other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J1/00C09J11/04
CPCC09J1/00C09J11/04
Inventor 郭建华熊俊彬陈旭明
Owner SOUTH CHINA UNIV OF TECH
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