Silicone rubber microporous material and preparation method thereof

Abstract

The invention discloses a silicone rubber microporous material and a preparation method thereof. The method comprises the following steps of (I) mixing 67-89 weight parts of pore forming agent with 10-33 weight parts of liquid silicone rubber to form a first mixture; (II) putting the first mixture into a mould, and curing in a constant-temperature heating device; (III) demoulding: putting the first mixture after the heating and curing in the step (II) into the distilled water to leach out the pore forming agent to obtain the silicone rubber microporous material. In the method disclosed by the invention, the liquid silicone rubber and the pore forming agent are mixed and formed, and then the pore forming agent is separated out by washing to obtain the pored silicone rubber microporous material; the process is simple and convenient to operate; a vulcanization process does not conflict with a foaming process, the vulcanization is performed before dissolving particles to form pores, and the temperature rise is only related to the vulcanization time; the production cost is low.

Description

technical field [0001] The embodiment of the present invention relates to an open-cell silicone rubber microporous material and a preparation method thereof, belonging to the field of polymer material processing. Background technique [0002] Silicone rubber microporous material combines the properties of silicone rubber material and microporous material. It not only has the excellent properties of silicone rubber, but also has good heat insulation, sound insulation and high rebound resistance. Widely used as sealing, sound insulation, heat insulation and shock absorption and other fields. [0003] The methods of preparing silicone rubber microporous materials mainly include chemical foaming method and physical foaming method. The microporous silicone rubber prepared by chemical method is mostly closed-cell structure, the foaming reaction speed is fast, and it is difficult to match foaming and vulcanization, making the material The cell size, cell structure, and density uni...

AI Technical Summary

Problems solved by technology

[0003] The methods of preparing silicone rubber microporous materials mainly include chemical foaming method and physical foaming method. The microporous silicone rubber prepared by chemical method is mostly closed-cell structure, the foaming reaction speed is fast, and it is difficult to match foaming and vulcanization, making the material The cell size, cell structure, and density uniformity are all difficult to control; methods such as the inert gas method and the low boiling point liquid method in the physical foaming method also have the above-mentioned problems, which makes the performance of the obtained silicone rubber microporous material It is difficult to meet the actual application needs

[0004] The preparation of high-temperature vulcanized silicone rubber foam materials is usually vulcanized and foamed by using peroxide. The matching of the vulcanization process and the foaming process is the key to the preparation of foam materials. Both the foaming agent and the peroxide vulcanizing agent are very sensitive to temperature. When the temperature rises by 10°C, both the vulcanization rate and the decomposition rate of the foaming agent increase exponentially, which makes it very difficult to control the cell structure and uniformity of the foamed material.

In order to achieve the matching of crosslinking speed and foaming speed, it is often necessary to repeatedly study the formula and process, so the process is very complicated and the cost is high

Images