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Flameproofing silicone structure sealant and mfg. method thereof

A manufacturing method and technology of sealant, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of poor coloring and flame retardancy, insufficient platinum compound, insufficient toughness, etc., and achieve low dosage and high activity. , The effect of good initial water resistance adhesion

Active Publication Date: 2007-05-09
CHENGDU GUIBAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a method of imparting flame retardancy to silicone sealants, flame retardant fillers such as basic zinc carbonate, zinc borate, aluminum hydroxide, and magnesium hydroxide are generally used as flame retardants, but the method of adding flame retardant fillers alone The hardness of the prepared silicone sealant is too high, the toughness of the glue is not good enough, and it cannot be used as a structural adhesive; platinum compounds are also used as flame retardants, but usually in high-temperature vulcanized silicone rubber systems, and only platinum compounds can be used as flame retardants. Not enough, also consider multiple materials to make additives, for example: listed carbon black in US3652488, listed titanium oxide in US3635874; Add iron oxide black (Fe 3 o 4 ), but these methods have the shortcomings that the compounded rubber must be colored and the flame retardancy will deteriorate with time; CN 1493618A has obtained a compound with excellent flame retardancy by adding a mixed platinum compound and a specific amine compound to the silicone rubber composition. It is a non-toxic silicone rubber composition, but it is also a high-temperature vulcanized silicone rubber instead of a room temperature vulcanized silicone rubber. At the same time, due to the addition of amine compounds, it will produce toxic gases when burned

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Add 200 parts of a, ω-dihydroxy polydimethylsiloxane with a viscosity of 10 Pa·S at 25°C and 180 parts of activated calcium carbonate into a vacuum mixer at a temperature of 120°C and a degree of vacuum of 0.09 MPa dehydration blending for 60 minutes, cooling to room temperature to obtain the base material; 60 parts of basic zinc carbonate, 0.30 parts of 1.3.5.7-tetramethylcyclotetrasiloxane and 0.2 parts of vinyl siloxane chelate, stirring at 100℃ After 1.5 hours of reaction, add all of it to the above base material, stir evenly, then add 8 parts of methyltrimethoxysilane, 8 parts of γ-aminopropyltriethoxysilane, 3 parts of propyl titanate, platinum 0.20 parts of vinyl siloxane chelate, 10 parts of polydimethylsiloxane with a viscosity of 1Pa·S at 25°C, and chemical reaction for 80 minutes at a vacuum of 0.08MPa and a rotating speed of 350rpm to obtain a single set It is divided into room temperature vulcanization flame-retardant silicone structural sealant. The...

Embodiment 2

[0034]Example 2: Add 200 parts of a, ω-dihydroxy polydimethylsiloxane with a viscosity of 30 Pa·S at 25°C and 120 parts of activated calcium carbonate into a vacuum mixer at a temperature of 130°C and a degree of vacuum of 0.08 Dehydrate and blend for 60 minutes at MPa, and cool to room temperature to obtain base material; 100 parts of basic zinc carbonate, 0.40 part of 1.3.5.7-tetramethylcyclotetrasiloxane and 0.3 part of vinyl siloxane chelate at a temperature of 100°C After stirring and reacting for 4.5 hours, add all of it to the above base material, stir evenly, then add 4 parts of methyltrimethoxysilane, 6 parts of vinyltrimethoxysilane, and γ-chloropropyltriethoxysilane 3 Parts, 5 parts of isopropyl titanate, 2 parts of butyl titanate, 0.10 parts of platinum vinyl siloxane chelate, 15 parts of polydimethylsiloxane with a viscosity of 1Pa·S at 25°C, in a vacuum The temperature was 0.09 MPa, and the chemical reaction was carried out at 350 rpm for 80 minutes to prepare a one-...

Embodiment 3

[0035] Example 3: 50 parts of a, ω-dihydroxy polydimethylsiloxane with a viscosity of 50 Pa·S at 25°C and a, ω-dihydroxy polysiloxane 150 with a viscosity of 20 Pa·S at 25°C Part, 140 parts of activated calcium carbonate, add to the vacuum mixer, dehydration and blend for 60 min at a temperature of 90°C and a vacuum of 0.099MPa, and cool to room temperature to obtain the base material; 30 parts of basic zinc carbonate, 1.3.5.7-tetramethyl 0.10 part of cyclotetrasiloxane and 0.1 part of vinyl siloxane chelate. After stirring and reacting at a temperature of 100°C for 3 hours, add them all to the above base material, stir evenly, and then add methyltrimethoxysilane 25 Parts, 4 parts of γ-chloropropyltriethoxysilane, 5 parts of isobutyl titanate, 7 parts of platinum vinyl siloxane chelate, 2 parts of polydimethylsiloxane, the vacuum degree is 0.07 The chemical reaction was carried out at 350 rpm for 80 minutes to obtain a single-component room temperature vulcanized flame-retardant s...

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PUM

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Abstract

The present invention relates to a fire-retardant sealant with silicone structure and its preparation method. Said method includes the following steps: adding 100 weight portions of alpha, omega-dihydroxypolysiloxane and 60-100 weight portions of active calcium carbonate into vacuum stirring machine at 80-150 deg.c, vacuum degree is 0.06-0.099 MPa, dewatering and mixing for 30-300 min., cooling to obtain base material; then adding 0.03-0.2 weight portions of 1,3,5,7-tetramethylcyclo-tetrasiloxane, 10-50 weight portions of zinc hydroxy carbonate, 2-15 weight portions of cross-linking agent, 0.5-5 weight portions of silane coupling agent, 0.5-5 weight portions of catalyst, 0.05-5 weight portions of platinum chelate and 0-10 weight portions of polydimethylsiloxane together with the above-mentioned base material into stirring machine to make chemical reaction for 30-150 min so as to obtain the invented product.

Description

1. Technical Field [0001] The invention relates to a single-component room temperature vulcanized flame-retardant silicone structural sealant and a manufacturing method thereof, and belongs to the field of polymer sealing materials. 2. Background technology [0002] In the 1970s, glass curtain walls began to develop rapidly in European and American countries due to their unique structural properties. They became popular in Asia in the 1980s and were widely used in China in the 1990s. The silicone structural sealant used in the glass curtain wall has high performance and application requirements, only a few professional silicone companies such as Dow Corning in the United States could produce it before 1997. [0003] The important difference between silicone structural sealant and general silicone sealant is that it requires both proper tensile bonding strength and good toughness after vulcanization, as well as excellent bonding stability and excellent weather resistance. To ensur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/10
Inventor 王有治袁素兰卢麟邹百军
Owner CHENGDU GUIBAO SCI & TECH