Preparation method of silicone rubber sponge

Abstract

The invention discloses a preparation method of a silicone rubber sponge, and belongs to the field of silicone rubber sponges. The preparation method includes the steps that alkali is added in rosin and pig's hooves to obtain a saponified mixed solution, the saponified mixed solution is then mixed with a bone glue solution to obtain a rosin albumin glue foaming solution, raw organic silicon rubber, white carbon black and nano-silica are subjected to mixing, then placed in a press vulcanizer for radiation crosslinking vulcanization and then transferred into a double-roll open mill, the rosin albumin glue foaming solution and hydrogen-containing silicone oil are added for foaming to obtain a silicone rubber sponge rubber material, and finally extrusion and granulation are carried out to obtain the silicone rubber sponge. The biological foaming agent prepared through the method is free of undesirable odors, toxins and pollution, emits little heat when decomposed and has storage stability; through radiation crosslinking vulcanization, the silicone rubber material has a proper crosslinking degree, and cells of the prepared silicone rubber sponge are small and uniform; by adding white carbon black, the cell diameter of silicone rubber can be reduced, the tensile strength can be improved, and the compression set can be reduced.

Description

technical field [0001] The invention discloses a preparation method of a silicone rubber sponge, which belongs to the field of silicone rubber sponges. Background technique [0002] Silicone rubber has typical polysiloxane properties, the main chain is composed of repeated Si-O bonds, and the combination is very firm, making silicone rubber heat-resistant, weather-resistant, oxidation-resistant, flame-retardant, radiation-resistant and physiologically inert. The use of foaming method can improve the compressibility of silicone rubber and reduce production costs. The foamed silicone rubber sponge not only has a lower density, but also has excellent shock absorption, sound insulation, and heat insulation. It is widely used in aerospace, electronic and electrical, automotive, construction, instrumentation, medical and health industries, etc. . Rubber sponge extrusion molding is a continuous molding method with a high degree of automation, which is characterized by high effici...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: the decomposition of the chemical foaming agent used in the preparation process of the traditional silicone rubber sponge will produce toxic by-products harmful to the environment, and the density of the foam is uneven and the skin is thick, while the commonly used peroxidized When cross-linking with vulcanizing agent, a large number of small molecules remain in the rubber compound, which is easy to cause yellowing of silicone rubber and shorten the service life. A preparation method of silicone rubber sponge is provided. First, add rosin and trotter horn Alkaline saponification mixed solution, then mixed with bone glue solution to get rosin protein glue foaming solution, mixing organic silicon rubber raw material, white carbon black and nano-silica, after mixing, put it in a flat vulcanizer for radiation cross-linking vulcanization After processing, transfer it to a double-roll mill, add rosin protein glue foaming liquid and hydrogen-containing silicone oil to foam to obtain a silicone rubber sponge compound, and finally extrude and granulate to obtain a silicone rubber sponge, which is prepared by the present invention Biological foaming agent is odorless, non-toxic, non-polluting, low heat generation when decomposed and stable in storage. It adopts radiation cross-linking vulcanization treatment, so that the silicone rubber material can obtain an appropriate degree of cross-linking, and the prepared silicone rubber sponge has small cells. Uniform, adding silica can reduce the cell diameter of silicone rubber, enhance tensile strength and reduce compression set