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A kind of high-strength high-temperature-resistant silicone sealant and preparation method thereof

A technology of silicone sealant and high temperature resistance, applied in chemical instruments and methods, adhesives, other chemical processes, etc., can solve unfavorable product industrialization, high cost of zirconium-based ceramic powder, affecting the tensile properties of silicone sealant, etc. question

Active Publication Date: 2021-04-23
广东三和控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201710077333.8 provides a silicone sealant formula with high temperature resistance. Although the high temperature resistance can reach 300°C, in order to improve the high temperature resistance of the product in this patent formula, too much high temperature resistant filler metal oxide is added. Seriously affects the tensile properties of silicone sealants
Patent CN201310002398.8 also provides a silicone sealant formula with high temperature resistance, which improves the high temperature resistance of the product by adding zirconium-based ceramic powder, but the high cost of zirconium-based ceramic powder is not conducive to the industrialization of the product
[0005] The above-mentioned patents aim at the research of different silicone sealant product systems, and put forward different solutions for high temperature resistance and other properties, but how to reduce the production cost while improving the high temperature resistance and tensile properties of silicone sealant have not been proposed. solution

Method used

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  • A kind of high-strength high-temperature-resistant silicone sealant and preparation method thereof
  • A kind of high-strength high-temperature-resistant silicone sealant and preparation method thereof
  • A kind of high-strength high-temperature-resistant silicone sealant and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a. According to the proportion by weight, 60 parts of α, ω-dipropenyloxy polydimethylsiloxane with a viscosity of 6000mPa.s, 30 parts of azidoformyloxysilane modified nano kaolin, Add 3 parts of diene-modified phenyl hydrogen-containing silicone oil into the kneader, dehydrate and blend for 15-25min at 140°C and vacuum degree of 0.06-0.099MPa, and obtain the base rubber after cooling;

[0035] b. Mix 5 parts of the mixture of methyl tributylketoxime silane: diphenyl dibutyl ketoxime silane = 2:1, diphenyl dibutyl ketoxime silane aminopropyl triethoxysilane: isocyanate group Add 1.9 parts of propyltrimethoxysilane=2:1 mixture, 0.1 part of dibutyltin dilaurate into the mixer, and stir at room temperature for 10-20 minutes to obtain the mixture;

[0036] c. Add the above-mentioned rubber base to the mixer at room temperature, stir for 15 minutes, add the above-mentioned mixture, and then react for 50 minutes at a vacuum degree of 0.08-0.099 MPa and a speed of 10-800 rpm to...

Embodiment 2

[0038] a. According to the proportion by weight, 35 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 90000mPa.s, 7 parts of single-ended hydroxyl polydimethylsiloxane with a viscosity of 1000mPa.s, and azide Add 50 parts of sulfonylsilane-modified nano-kaolin and 2 parts of 3-pentadecene-modified phenyl hydrogen-containing silicone oil into a kneader, and dehydrate and blend for 60 minutes at 135°C with a vacuum of 0.06-0.099MPa. After cooling, base rubber is obtained;

[0039]b. 4 parts of phenyl tributylketoxime silane: methyl vinyl dibutyl ketoxime silane = 3:1 mixture, γ-aminopropyl trimethoxysilane: isocyanate propyl triethoxysilane = 1.9 parts of a mixture of 2:2 and 0.1 part of dimethyltin dineodecanoate were added to the mixer and stirred at room temperature for 20 minutes to obtain a mixture;

[0040] c. Add the above-mentioned rubber base to the mixer at room temperature, stir for 15 minutes, add the above-mentioned mixture, and then react for 40 min...

Embodiment 3

[0042] a. According to the proportion by weight, 40 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 80000mPa.s, 13 parts of single-ended hydroxyl polydimethylsiloxane with a viscosity of 500mPa.s, and azide 40 parts of formamide hydrocarbyl silane modified nano-kaolin, 2 parts of 2-tridecene modified phenyl hydrogen-containing silicone oil, added to the kneader, at 145 ° C, under a vacuum of 0.06-0.099 MPa, dehydration and blending for 60 minutes, After cooling, base rubber is obtained;

[0043] b. Mix 3 parts of vinyl tributylketoxime silane: methylphenyl dibutyl ketoxime silane = 2:1 mixture, N-β aminoethyl γ-aminopropyl trimethoxysilane: isocyanate propane Add 1.95 parts of a mixture of triethoxysilane=3:1 and 0.05 parts of dimethyltin dineodecanoate into a mixer, and stir at room temperature for 20 minutes to obtain a mixture;

[0044] c. Add the above-mentioned rubber base to the mixer at room temperature, stir for 20 minutes, add the above-mentioned mix...

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Abstract

The invention discloses a high-strength and high-temperature-resistant silicone sealant, which comprises the following components: organopolysiloxane, modified nano kaolin, modified silicone oil, silane composite crosslinking agent, composite silane coupling agent and catalyst. The present invention has the following advantages: 1. Using azide silane to modify the surface of nano-kaolin, so that the silicone sealant has a better reinforcing effect, can replace calcium carbonate, and can also partially replace white carbon black, reducing production costs , improve the mechanical properties such as tensile strength of the product, and endow the material with special physical and chemical properties such as corrosion resistance, flame retardancy, and insulation; Silicone oil has better high temperature resistance. The introduction of long-chain alkyl groups can not only enhance the hydrophobicity of silicone oil, but also improve its surface properties, so that it has better compatibility with organic polymers; 3. Using compound silane Coupling agent, improve the bonding performance of silicone sealant to metal, plastic, stainless steel and other substrates.

Description

technical field [0001] The invention relates to a silicone sealant, in particular to a high-strength and high-temperature-resistant silicone sealant. Background technique [0002] Silicone sealant has good adhesion to metal, aluminum doors and windows, plastic and other materials due to its good electrical insulation performance, chemical stability, weather aging resistance, displacement resistance, elastic recovery ability, and small shrinkage after curing. , is widely used in the fields of electronic appliances, construction, aviation, automobiles and medical and health materials, and has become an indispensable material in today's industry. As the demand for silicone sealant increases, the requirements for high temperature resistance and high strength performance of silicone sealant are also getting higher and higher. [0003] At present, the ordinary silicone sealants on the market are generally poor in high temperature resistance and low in strength. Although the appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/07C09J183/04C09J11/04C09J11/08C09J11/06C09K3/10
CPCC08K2201/011C08K2201/014C08L2201/08C08L2205/025C08L2205/03C08L2312/08C09J11/04C09J11/06C09J11/08C09J183/04C09K3/10C09K2003/1078C08L83/04C08K13/06C08K9/06C08K3/346C08K5/5465C08K5/544
Inventor 陈炳耀关志涛陈炳强
Owner 广东三和控股有限公司
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