Method for preparing flame-retardant low-smoke halogen-free hot-vulcanized silicone rubber compounds for metro vehicles

Abstract

The invention relates to a method for preparing flame-retardant low-smoke halogen-free hot-vulcanized silicone rubber compounds for metro vehicles, which is characterized in that the method comprises the following technological process: adding methyl vinyl silicone rubber to a kneading machine; adding white carbon black and hydroxyl silicone oil; mixing the materials for 1+/-0.1 hour at a nitrogen-supplying speed of 5+/-0.1 cubic meter/hour at a temperature between 170 and 190 DEG C; cooling to 60+/-5 DEG C; adding porcelainizing powder, aluminum silicate, chloroplatinic acid, zinc stannate and aluminum hydroxide; continuing to mix for 0.5+/-0.05 hour; discharging the materials; filtering rubber in a rubber filter; cooling the obtained product to room temperature; adding 2,5-dimethyl-2,5-bis(tert-butylperoxy) hexane or peroxide bis(2,4-dichloro-benzoyl) serving as a curing agent to an open mill; mixing well; and obtaining the flame-retardant low-smoke halogen-free hot-vulcanized silicone rubber compounds for metro vehicles. As the method adopts halogen-free flame retardant and particularly adopts a porcelainizing smoke-cutting technique, smoke almost completely disappears after the product produced by the method burns for a plurality of minutes, and the inside of the product can be kept in good condition.

Description

(1) Technical field [0001] The invention relates to a thermally vulcanized silicone rubber compound, in particular to a flame-retardant, low-smoke, halogen-free thermally vulcanized silicone rubber compound for subway vehicles. It is mainly used in the manufacture of rubber parts such as doors and windows, interior decoration, air conditioners and shock absorbers of subways. (2) Background technology [0002] The heat-vulcanized silicone rubber used in the doors and windows of the subway, interior decoration, air conditioners and shock absorbers and other rubber parts is mainly divided into ordinary heat-vulcanized silicone rubber, halogen-containing flame-retardant heat-vulcanized silicone rubber and ordinary halogen-free flame-retardant Three types of heat vulcanized silicone rubber. Ordinary heat-vulcanized silicone rubber, because its main components contain carbon and hydrogen elements, will continue to burn once it catches fire; halogen-containing flame-retardant heat...

AI Technical Summary

Problems solved by technology

Ordinary heat-vulcanized silicone rubber, because its main components contain carbon and hydrogen elements, will continue to burn once it catches fire; halogen-containing flame-retardant heat-vulcanized silicone rubber, because its raw materials contain halogen flame retardants such as bromine and chlorine Although it is difficult to burn, it will produce smoky, highly toxic hydrogen halide and other halogen-containing organic compounds when burned; ordinary halogen-free flame-retardant heat-vulcanized silicone rubber compounds, because their raw materials contain aluminum hydroxide and magnesium hydroxide Flame retardant, although the smoke is small and the toxicity is low when burning, its flame retardant efficiency is not high. To obtain good flame retardancy, the proportion of flame retardant added is relatively high, so the physical and mechanical properties (physical properties) are poor, and the tear strength Not higher than 6Mpa, easy to damage