Tear-resistant mold silicone rubber and preparation method thereof

Abstract

The invention discloses tear-resistant mold silicone rubber. The tear-resistant mold silicone rubber is prepared from the following ingredients in parts by mass: 100 to 120 parts of vinyl-terminated polydimethylsiloxane, 5 to 15 parts of terminal chain and side chain high vinyl polydimethylsiloxane, 15 to 25 parts of terminal chain hydroxyl side chain vinyl polydimethylsiloxane, 30 to 45 parts of fumed silica, 0.6 to 1.4 parts of a catalyst, 10 to 30 parts of vinyl-terminated polydimethylsiloxane, 70 to 90 parts of terminal chain and side chain hydrogen-containing polydimethylsiloxane, 0.2 to 0.6 part of alkynol reaction inhibitor and 0.1 to 0.2 part of free radical scavenger. The invention further discloses a preparation method of the tear-resistant mold silicone rubber. The tear-resistant mold silicone rubber is obtained through kneading, vacuumizing, stirring, filtering, defoaming and vulcanization forming. The tear-resistant mold silicone rubber has the advantages of good tear resistance and stable performance.

Description

technical field [0001] The invention relates to the technical field of organic silica gel materials, in particular to a tear-resistant mold silicone rubber and a preparation method thereof. Background technique [0002] With the increasing demand for decorative products in China, Europe, America, India, and the Middle East, a large number of enterprises producing lighting accessories, clothing accessories, shoes and hat accessories, handicrafts, nail accessories, mobile phone accessories, etc. have emerged in China. The vast majority of them are ornaments molded by epoxy resin, and the molding of epoxy resin is based on the vulcanized two-component liquid silicone rubber as the master mold, that is, the silicone rubber mold is molded. After turning over the mold 21 to 25 times, there will be cracks at the edges and corners of the silicone rubber mold, and more seriously, the entire silicone rubber mold will crack. The reasons for the cracking of the silicone rubber mold and ...

AI Technical Summary

Problems solved by technology

Most of them are accessories molded by epoxy resin, and the molding of epoxy resin is based on the vulcanized two-component liquid silicone rubber as the master mold, that is, the silicone rubber mold is molded. At this stage, silicone rubber molds are common in the market After turning the mold 21 to 25 times, there will be cracks at the edges and corners of the silicone rubber mold, and more seriously, the entire silicone rubber mold will crack. The reasons for the cracking of the silicone rubber mold and the low number of mold turning are: The tear strength is not high, and the silicone rubber mold is not resistant to the erosion of epoxy resin ammonia curing agent and active diluent, etc.