Heat-resistant and acid-alkali-resistant organic silica gel

An organic silica gel, acid and alkali resistance technology, used in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problem that acid and alkali resistance and high temperature resistance are not ideal, cannot be used in thermal power plants, heat Insufficient stability and acid and alkali resistance to achieve the effect of improving thermal stability and acid and alkali resistance

Active Publication Date: 2020-03-31
GUANGZHOU GLORYSTAR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing heat-resistant organic silica gel has insufficient thermal stability and acid and alkali resistance. Generally, the organic silica gel with acid, alkali and high temperature resistance is a condensation-type one-component organic silica gel. Alkane is the basic polymer, which is made by adding acid and alkali-resistant fillers, conventional heat-resistant agents, cross-linking agents, catalysts and coupling agents, but the product's acid and alkali resistance and high temperature resistance are not very ideal. In terms of heat resistance, When the temperature exceeds 200°C, the surface of the rubber will be abnormal within 1 hour; the product will be soaked in 5% acid-base test solution, and the surface will be degummed within 3 days, so it cannot be used in outdoor thermal power plants for a long time

Method used

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  • Heat-resistant and acid-alkali-resistant organic silica gel
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  • Heat-resistant and acid-alkali-resistant organic silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0044] Add α,ω-dihydroxy polydimethylsiloxane, color paste, heat-resistant agent and plasticizer to the planetary mixer at room temperature, stir under vacuum for 20 minutes, then add crosslinking agent, stir under vacuum for 20 minutes Minutes; add baked acid and alkali-resistant filler and grilled reinforcing filler in stages, and stir in vacuum for 20 minutes; then add coupling agent and catalyst and stir in vacuum for 25 minutes to obtain organic silica gel.

[0045]The cross-linking agent is a 1:1 combination of methyl tributylketoxime silane and methyl triacetone oximino silane; the acid and alkali resistant filler is ultrafine precipitated barium sulfate; the reinforcing filler has a specific surface area of ​​not less than 150m 2 / g of hydrophobic fumed silica; the color paste is titanium dioxide series color paste; the coupling agent is γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxy base silane and γ-aminopropyltrimethoxysilane in a 1:2:1 combi...

Embodiment A4

[0055] And embodiment A4, has used TiO 2 P25, TiO 2 The combination of PF2 and polyisobutylene, after 24h at 270°C, the tensile strength performance remained unchanged at 2.9MP; the elongation at break decreased from 220% to 215%, and only decreased by less than 5%; the tear strength decreased from 3.8MP Drop to 3.7MP, only drop 0.1MP; Hardness drops to 49A from 50A, only drop 1A; Through embodiment A4 alone and embodiment A1, embodiment A2 and embodiment A3 contrast can draw a conclusion, in this formulation system, and Use TiO 2 P25, TiO 2 Both PF2 and polyisobutylene cannot obtain thermal stability, while using TiO 2 P25, TiO 2 The combination of PF2 and polyisobutylene can greatly improve thermal stability, and can withstand 270°C environment for 24 hours without drastic change in performance.

Embodiment B1

[0058] Add 100 parts of α, ω-dihydroxypolydimethylsiloxane, 10 parts of color paste, 9 parts of heat-resistant agent and 15 parts of plasticizer to the planetary mixer at room temperature, After stirring for 10 minutes under vacuum conditions, add 6 parts of cross-linking agent, and stir for 10 minutes under vacuum; add 30 parts of baked acid and alkali-resistant fillers and 10 parts of grilled reinforcing fillers, and stir for 10 minutes under vacuum; then add 1 part of coupling agent and 0.1 part of catalyst were stirred in vacuum for 15 minutes to obtain organic silica gel.

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Abstract

The invention discloses a heat-resistant and acid-alkali-resistant organic silica gel comprising, by weight, 90 to 110 parts of alpha, omega-dihydroxy polydimethylsiloxane, 4 to 10 parts of a cross-linking agent, 25 to 40 parts of an acid and alkali resistant filler, 6 to 14 parts of a reinforcing filler, 5 to 10 parts of a color paste, 0.8 to 1.5 parts of a coupling agent, 0.1 to 0.3 part of a catalyst, 2 to 10 parts of a heat-resistant agent and 10 to 20 parts of a plasticizer; wherein the acid and alkali resistant filler comprises ultrafine precipitated barium sulfate; and the heat-resistant agent is composed of TiO2P25, TiO2PF2 and polyisobutene. According to the heat-resistant and acid-alkali-resistant organic silica gel, a heat resistant agent composed of TiO2P25, TiO2PF2 and polyisobutene, and ultrafine precipitated barium sulfate taking as an acid-alkali-resistant filler are added into alpha, omega-dihydroxy polydimethylsiloxane, so that the thermal stability and acid and alkali resistance of the organic silica gel can be greatly improved, and the product can resist the environment of 270 DEG C for 24 hours, 5% sulfuric acid (7 days) and 5% NaOH (7 days).

Description

technical field [0001] The invention relates to the technical field of silicone sealing materials, in particular to a heat-resistant, acid- and alkali-resistant silicone. Background technique [0002] The existing heat-resistant organic silica gel has insufficient thermal stability and acid and alkali resistance. Generally, the organic silica gel with acid, alkali and high temperature resistance is a condensation-type one-component organic silica gel. Alkane is the basic polymer, which is made by adding acid and alkali-resistant fillers, conventional heat-resistant agents, cross-linking agents, catalysts and coupling agents, but the product's acid and alkali resistance and high temperature resistance are not very ideal. In terms of heat resistance, When the temperature exceeds 200°C, abnormalities will appear on the surface of the rubber within 1 hour; the product will be soaked in 5% acid-base test solution, and the surface will be degummed within 3 days, so it cannot be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J11/04C09J11/08
CPCC08K2003/2241C08K2003/3045C08K2201/011C08K2201/014C08L2201/08C08L2205/025C08L2205/03C09J11/04C09J11/08C09J183/04C08L23/22C08L83/04C08K13/04C08K7/26C08K3/30C08K3/22
Inventor 朱超胡新嵩程小莲陈浩英罗伟屈哲辉何宗业翟晓旭汪建平夏文龙
Owner GUANGZHOU GLORYSTAR CHEM
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