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

A silicone sealant, high temperature resistant technology, applied in adhesives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve the problem of low tensile strength and elongation at break, slow deep curing, sticky In order to improve the tensile strength and high temperature resistance, improve the resistance to humidity and heat, and improve the heat resistance

Active Publication Date: 2021-08-06
KESHUN WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although silicone sealants are widely used in modern industry and have broad market prospects, there are still many problems in the process of use, such as slow deep curing of one-component products, low tensile strength and elongation at break, poor storage stability, etc. series of questions
The silicone sealant products in the prior art have poor mildew resistance and heat resistance. For example, after curing, they cannot be placed in a high-humidity environment for a long time, and mold is easy to breed. In terms of heat resistance, it cannot withstand the working environment above 200°C for a long time, or the short-term temperature working environment below 300°C

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high-temperature-resistant and mildew-proof silicone sealant, which consists of the following components calculated in parts by weight:

[0035]

[0036] The preparation method of the high temperature-resistant mildew-proof silicone sealant is as follows:

[0037] (1) Add α,ω-dihydroxypolysiloxane, methylphenyl silicone oil, anti-fungal agent, and crosslinking agent to the planetary mixer, start stirring, rotate at 200-400r / min, vacuumize, and control the vacuum degree at -0.09MPa or more, stir for 5 minutes;

[0038] (2) Stop stirring, fill with nitrogen to relieve the vacuum, add reinforcing filler, start stirring at a speed of 100-200r / min, and stir for 10 minutes; stop, add high-temperature-resistant fillers, start stirring, and turn at a speed of 200-300r / min, and stir for 15 minutes ;

[0039] (3) Stop stirring, use a spatula to scrape the planetary paddle, then start stirring, adjust the speed to 600-800r / min, vacuumize, connect the cooling water, control ...

Embodiment 2

[0043] A high-temperature-resistant and mildew-proof silicone sealant, which consists of the following components calculated in parts by weight:

[0044]

[0045] The preparation method of the high-temperature-resistant and mildew-proof silicone sealant is the same as that in Example 1.

Embodiment 3

[0047] A high-temperature-resistant and mildew-proof silicone sealant, which consists of the following components calculated in parts by weight:

[0048]

[0049]

[0050] The preparation method of the high-temperature-resistant and mildew-proof silicone sealant is the same as that in Example 1.

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Abstract

The invention discloses a high-temperature-resistant mildew-proof silicone sealant and a preparation method thereof. The high-temperature-resistant mildew-proof silicone sealant comprises the following components calculated in parts by weight: α,ω-dihydroxy polysiloxane 50 ~100 parts; 5~20 parts of reinforcing filler; 5~20 parts of methyl phenyl silicone oil; 40~100 parts of high temperature resistant filler; 0.05~0.2 parts of antifungal agent; 0.2-1 part of coupling agent; the α,ω-dihydroxypolysiloxane is α,ω-dihydroxypolydimethylsiloxane, α,ω-dihydroxypolydimethylsiloxane, phenyl substituted partial side chain methyl Mixture of dihydroxypolymethylphenylsiloxanes. The high-temperature resistant and mildew-resistant silicone sealant prepared by the invention has good elasticity, high tensile strength and elongation at break, and excellent high-temperature resistance and heat-and-humidity resistance.

Description

technical field [0001] The invention relates to the field of silicone sealant, in particular, the invention relates to a high-temperature-resistant and mildew-resistant silicone sealant and a preparation method thereof. Background technique [0002] Silicone sealant is made of hydroxyl-terminated polydimethylsiloxane as the main film-forming substance, supplemented with plasticizers, fillers, cross-linking agents, coupling agents and catalysts, and mixed under high-temperature dehydration and vacuum Its film-forming and curing mechanism is firstly that after the cross-linking agent in the system contacts the moisture in the atmosphere, the hydrolyzable functional group undergoes a hydrolysis reaction rapidly to form silanol. The Si-OH of its silanol undergoes a condensation crosslinking reaction with the Si-OH at both ends of the polydimethylsiloxane to form an elastomer with a three-dimensional network structure. Silicone sealants have excellent bonding properties, good el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/04C09J11/04C09J11/06C09J11/08
CPCC08K2003/2265C08K2201/014C08L2201/08C08L2205/025C08L2205/03C09J11/04C09J11/06C09J11/08C09J183/04C08L83/04C08K13/06C08K9/04C08K3/36C08K3/22C08K5/47C08K5/5465
Inventor 何宏林龚兴宇
Owner KESHUN WATERPROOF TECH CO LTD
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