Foamed silicone rubber and preparation method thereof

Abstract

The invention discloses foamed silicone rubber and a preparation method thereof, and belongs to the technical field of silicone rubber materials. Vinyl silicone rubber containing different amounts ofethylene is taken as a base rubber, the introduction of a small amount of ethylene is beneficial to improving vulcanization activity, increasing the selection range of organic peroxide vulcanizing agents, improving the heat aging resistance, mechanical strength and compression permanent deformation performance of vulcanized rubber; and meanwhile, the foamed silicone rubber is prepared by adoptinga method combining freezing and two-stage vulcanization reaction, and the two-stage vulcanization reaction is beneficial to avoiding the occurrence of over-sulfur, thus improving the mechanical properties and compression permanent deformation properties of a foamed silicone rubber product. Combined with the freezing process, the foaming uniformity and mechanical properties of the prepared productare improved, and the tensile strength of the prepared foamed silicone rubber reaches 0.87 Mpa.

Description

Technical field [0001] The invention belongs to the technical field of silicone rubber materials, and specifically relates to a foamed silicone rubber and a preparation method thereof. Background technique [0002] Foamed silica gel, also known as silica gel foam, is a flexible and porous polymer elastomer that combines the characteristics of silica gel with the characteristics of foam materials made by foaming silicone rubber. Silicone foam not only maintains the excellent properties of silicone, such as non-toxic, high and low temperature resistance, insulation, and weather resistance, but also has the characteristics of light weight, sound absorption, and earthquake resistance. It is used as high performance such as damping, vibration reduction, sound insulation, and heat insulation. Materials are widely used in fields such as national defense, aerospace, transportation, electronics industry, construction and furniture. [0003] The current foaming process for the production of...

AI Technical Summary

Problems solved by technology

[0003] The current foaming process for producing foamed silicone rubber is due to the poor matching of the single component foaming agent and vulcanizing agent. As a result, the foaming rate is too fast, the silicone rubber cannot contain the gas, and the resulting cavity is too large to damage the silicon. The mechanical properties of the rubber, or the foaming rate is too slow, does not play the role of foaming. At the same time, there are problems such as poor stability of the material, density and cell structure that are not easy to control when using a one-stage vulcanization process.