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Mold-proof silicone sealant and preparation method thereof

A silicone sealant and anti-mildew technology, applied in chemical instruments and methods, adhesives, other chemical processes, etc., can solve the problem of poor compatibility between anti-fungal agents and basic rubber materials, decreased storage stability of rubber materials, yellowing, etc. problems, to achieve good compatibility, improve thixotropy, and improve the effect of mildew resistance

Inactive Publication Date: 2014-12-24
LUZHOU NORTH CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing anti-mold silicone sealant product will turn yellow after curing, the compatibility between the anti-mold agent and the basic rubber material is poor, and the storage stability of the rubber material after adding the anti-mold agent sex will drop

Method used

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  • Mold-proof silicone sealant and preparation method thereof

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[0034] The present invention also provides a preparation method of the above-mentioned mildew-proof silicone sealant, comprising the following steps:

[0035] a. Stir the hydroxyl-terminated polydimethylsiloxane, plasticizer and fumed silica at a temperature of 80-140°C for 30-60 minutes under a vacuum degree ≥ 0.09 MPa to obtain a rubber compound;

[0036] b. After cooling the rubber material to room temperature, add a crosslinking agent, antifungal agent, silane coupling agent, and catalyst in sequence, and stir for 30-45 minutes under a vacuum ≥ 0.09 MPa to obtain an antifungal silicone sealant.

[0037] Remove the moisture in hydroxyl-terminated polydimethylsiloxane, plasticizer, and fumed silica at a fixed temperature and vacuum range, so as not to affect the storage stability of the rubber compound due to excessive moisture content in the raw materials . Among them, the main purpose of adding additives under vacuum conditions in step b is also to make rubber in a dry en...

Embodiment 1

[0042]Add 100 parts of 50000mPa.s 107 glue (hydroxyl-terminated polydimethylsiloxane) into the dynamic mixer, add 80 parts of methyl-terminated polydimethylsiloxane with a kinematic viscosity of 3000mPa.s and specific surface area 170m 2 / g 20 parts of hydrophobic fumed silica, heat up to 110°C, stir and dehydrate for 45min under the condition of vacuum degree ≥ 0.09MPa, to obtain rubber compound. ; Cool the above-mentioned rubber material, and add 8 parts of phenyltributylketoxime-based silane, 1.5 parts of silicone sealant fungicide, 2.5 parts of γ-aminopropyltrimethoxysilane and two 0.3 parts of dibutyltin laurate, stirred for 30 minutes under the condition of vacuum degree ≥ 0.09MPa to make anti-mildew silicone sealant.

Embodiment 2

[0044] Add 100 parts of 50000mPa.s 107 glue (hydroxyl-terminated polydimethylsiloxane) into the dynamic mixer, add 55 parts of methyl-terminated polydimethylsiloxane with a kinematic viscosity of 2000mPa.s and specific surface area 26 parts of 170m2 / g hydrophobic fumed silica, heated up to 120°C, stirred and dehydrated for 45min under the condition of vacuum degree ≥ 0.09MPa, to obtain rubber compound. Cool the above-mentioned rubber material, and add 6 parts of vinyl tributylketone oxime silane, 0.6 parts of silicone sealant antifungal agent, γ-(2,3-glycidoxy) propyl Stir 2.5 parts of trimethoxysilane and 0.3 parts of dibutyltin dilaurate for 30 minutes under the condition of vacuum degree ≥ 0.09 MPa to make anti-mildew silicone sealant.

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Abstract

The invention belongs to the field of the silicone sealants and specifically relates to a mold-proof silicone sealant and a preparation method thereof. The mold-proof silicone sealant and the preparation method thereof are used for solving the technical problems of an existing mold-proof silicone sealant product such as yellowing after solidification, relatively poor compatibility of a mold-proof agent and a basis adhesive material and degradation of the storage stability of the adhesive material after the mold-proof agent is added. The mold-proof silicone sealant is prepared from such components in parts by weight as 100 parts of hydroxyl-terminated polydimethylsiloxane, 0-80 parts of plasticizer, 5-35 parts of fumed silica, 1-10 parts of cross-linking agent, 0.05-1.8 parts of mold-proof agent, 0.5-5 parts of silane coupling agent and 0.1-5 parts of catalyst. The invention also provides the preparation method of the mold-proof silicone sealant. The mold-proof agent and the adhesive material of the mold-proof silicone sealant are good in compatibility with each other and have no influence on the mechanical performance index of the mold-proof silicone sealant and the storage stability of the adhesive material, and therefore, the mold-proof silicone sealant can be applied to different occasions.

Description

technical field [0001] The invention belongs to the field of silicone sealant, and in particular relates to an anti-mildew silicone sealant and a preparation method thereof. Background technique [0002] With the rapid development of urbanization in my country, silicone sealing materials are more and more widely used in the construction industry due to their superior performance. One-component room temperature vulcanized silicone rubber, also known as silicone sealant, is widely used in various construction projects and interior decoration due to its excellent weather resistance, aging resistance, waterproof and moisture resistance. However, silicone sealants also have certain disadvantages, that is, after the rubber is completely cured, it will be exposed to high humidity and heat for a long time, and mold will easily grow on the surface. It will cause black spots on the surface, which will affect the appearance and the sealing performance of the scrap itself. Therefore, ...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/04C09J11/06C09J11/08C09J11/00C09K3/10
Inventor 孙晓泉李争鸣贺虎王勇武张文博朱文英
Owner LUZHOU NORTH CHEM IND
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