A kind of two-component room temperature curing silicone rubber and preparation method thereof

Abstract

The invention is a two-component room temperature curing silicone rubber and a preparation method thereof, comprising two components A and B, and component A includes A1α, ω-100 parts of dihydroxy polydimethylsiloxane in parts by weight, A2 methyl silicone oil 0-20 parts, A3 filler 50-150 parts; component B includes: B1 methyl silicone oil 100 parts, B2 crosslinking agent 10-25 parts, B3. deep curing agent 10-25 parts, B4. silane 5-25 parts of coupling agent, 0.2-2 parts of B5 catalyst; the preparation method of component A is to add components A2 and A3 to component A1 in sequence, and stir under the condition of vacuum greater than 0.095MPa after each addition 10‑20min, and finally component A can be obtained; the preparation method of component B is to add B2, B3, B4 and B5 components to B1 successively under N2 protection, and stir 20‑20‑ 30min, and finally component B can be prepared. The silicone rubber provided by the invention not only cures quickly in the deep layer, but also produces alcohol after curing, which is environmentally friendly, and has excellent moisture-heat aging resistance.

Description

technical field [0001] The invention relates to a two-component room temperature curing silicone rubber and a preparation method thereof. Background technique [0002] Two-component room temperature curing silicone rubber not only has excellent high and low temperature resistance, electrical insulation performance, environmental aging resistance, etc., but also has the characteristics of adjustable mixing ratio and fast curing speed. It is widely used in photovoltaics, electronics, automobiles, construction, etc. industry. Although the curing speed of two-component room temperature curing silicone rubber is fast, the deep curing performance is greatly affected by the moisture content in component A, and due to the limitation of certain application fields or product performance, the moisture content in component A It is difficult to add water or add a small amount, which seriously affects its deep curing performance. In the scheme of "a two-component room temperature curing...

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Problems solved by technology

In the scheme of "a two-component condensation type room temperature curing silicone rubber resistant to moisture and heat aging" in the publication number CN102424742A, a preparation method of a two-component condensation type room temperature curing silicone rubber resistant to moisture and heat aging is provided. Partially add compounds containing epoxy groups, and these additives, such as epoxy resins, have poor compatibility with the silicone rubber matrix, which will easily lead to a higher viscosity of component A and thixotropy, which makes certain Use in conditions where flow properties are required is limited

A two-component silicone sealant for solar modules resistant to moisture and heat aging and its preparation method are provided in the scheme of "damp heat aging resistant two-component silicone sealant for solar modules and its preparation method" in the publication number CN102977840A. It is to add silyl-terminated polyether, MQ type resin and other substances to component B. Compared with methyl silicone oil, these substances are more expensive, and their compatibility with methyl silicone oil is poor, and component B is prone to delamination Phenomenon

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