Whisker/silicone rubber composite and preparation method thereof

Abstract

The invention discloses a whisker / silicone rubber composite and a preparation method thereof. The preparation method includes the steps that A, 100 parts of vinyl polysiloxane compound rubber, 20-30 parts of white carbon black and 3 parts of first polysiloxane by mass are kneaded for at least 4 h at the temperature of 30-80 DEG C, and base rubber is obtained, wherein first polysiloxane is hydroxyl-terminated polysiloxane with the average molecular weight of 610-1,110; B, the base rubber and 24-60 parts of magnesium sulfate whiskers or magnesium borate whiskers by mass are kneaded for at least 3 h at the temperature of 30-80 DEG C, and a rubber compound is obtained; C, the rubber compound and 2-5 parts of vulcanizing agent by mass are mixed on a double-roller machine, a first mixture is obtained, the first mixture is pressurized and vulcanized for 20 min-30 min in a press vulcanizer at the pressure of 9 MPa-11MPa and the temperature of 165 DEG C-175 DEG C, the pressure is kept for at least 1 h, cooling is conducted, and then the whisker / silicone rubber composite is obtained. The whisker / silicone rubber composite prepared through the preparation method is further disclosed. The whiskers serve as flame retardant of the whisker / silicone rubber composite, and the advantages of being low in toxicity, stable, capable of abating smoke and the like are achieved.

Description

technical field [0001] The invention belongs to the technical field of silicone rubber materials, and in particular relates to a whisker / silicone rubber composite material and a preparation method thereof. Background technique [0002] Silicone rubber has unique chemical stability, weather resistance, high and low temperature resistance, insulation and physiological inertia, etc. It has been widely used in various fields of national economy. However, the molecular chain of silicone rubber contains a large amount of carbon and hydrogen, which will continue to burn when exposed to an open flame, which limits its application in the fields of wire and cable, electronics, automobiles, aerospace and other fields to a certain extent. Therefore, flame retardant modification of silicone rubber is required to expand its application range. [0003] Flame retardants commonly used in silicone rubber can be divided into additive flame retardants and reactive flame retardants. Additive f...

AI Technical Summary

Problems solved by technology

When copper and copper compounds are used in combination with silicone rubber, the rubber material is black and it is difficult to match colors, so it is greatly limited in practical applications

Platinum and platinum compounds are expensive, and are easily contaminated by some trace impurities, such as compounds containing N, P, S, etc., and lose their effect

When magnesium hydroxide is used as a flame retardant, it needs to be added in a large amount to play a flame retardant effect, but a large amount of addition will seriously affect the mechanical properties and processing properties of silicone rubber

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