Silicon rubber base, double-component silicon rubber and preparation methods of silicon rubber base and double-component silicon rubber

Abstract

The invention discloses a silicon rubber base, double-component silicon rubber and preparation methods of the silicon rubber base and the double-component silicon rubber. The preparation method of thesilicon rubber base sequentially comprises the steps: white carbon black preprocessing, kneading of the silicon rubber base, refilling of dimethyl silazane, vacuumizing processing, washing and vacuumizing. Meanwhile, the invention further provides the double-component silicon rubber; the silicon rubber comprises two components of A and B; both the component A and the component B comprise the silicon rubber base prepared by adopting the preparation method of the silicon rubber base. Compared with the prior art, the silicon rubber base and the double-component silicon rubber which are disclosedby the invention are obviously improved in various performances; the produced liquid silicon rubber base, due to adoption of a washing process, has an obvious improvement effect in the aspects of yellowing, odor, viscosity, thickening and the like of the silicon rubber base so as to improve appearance, fluidity, operability and storage stability of the finished product.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a silicone rubber-based rubber, a two-component silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber is an elastic body formed by compounding and vulcanizing with linear polyorganosiloxane as the basic polymer (raw rubber), adding crosslinking agent, reinforcing filler and other compounding agents. According to its commodity form, silicone rubber is divided into two categories: mixing silicone rubber and liquid silicone rubber. [0003] Liquid silicone rubber is different from compounded silicone rubber. It is a self-leveling or thixotropic base material (Compound) prepared from linear polyorganosiloxane with a medium degree of polymerization as the base polymer with fillers, various additives and additives. . Generally, large-scale processing equipment is not required for use, and it can be vulcanized into elastomers in t...

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Problems solved by technology

The base rubber prepared by this method produces more amine impurities, which will affect the color and other properties of the base rubber, resulting in poor quality of the prepared two-component silicone rubber.

[0005] The invention patent with the Chinese patent number 201510083787.7 discloses a two-component addition molding silicone rubber for injection molding, which is cured and molded by components A and B. The preparation method of component A is: 100 parts by mass of basic silica gel, platinum complex 0.10-0.30 parts by mass of catalyst, 0.1-2.0 parts by mass of acetylenic alcohols and vinyl ring complex inhibitors, 0.001-0.01 parts by mass of hydroxyl polysiloxane, weighed and placed in a planetary stirring tank under 60 ° C Stir in vacuum for 1-3 hours to make the stirring even and remove air bubbles, and filter to remove impurities to obtain component A; the preparation method of component B is: mix 0-100 parts by mass of basic silica gel, one or more hydrogen-based polysiloxane 4-15 parts by mass of alkane, preferably 5-10 parts by mass, 0-20 parts by mass of vinyl silicone oil, weighed and stirred in vacuum in a planetary stirring tank for 0.5-3 hours to make the stirring even and remove air bubbles, and filter to remove impurities The B component is obtained; the A component and the B component are solidified and molded; the silicone rubber prepared by this method only uses a conventional catalyst, and the amount used in the preparation process is relatively large, and the preparation cost is relatively high, and the prepared two-component Silicone rubber has poor fluidity, which affects the molding speed of the product and lower production efficiency during mold processing

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