Flame-retardant room-temperature vulcanized silicon rubber and preparation method thereof

Abstract

The invention provides a flame-retardant room-temperature vulcanized silicon rubber and a preparation method thereof. The flame-retardant room-temperature vulcanized silicon rubber is prepared from 100 parts of alpha, omega-dihydroxy polydimethyl siloxane, 3-10 parts of reinforcing filler, 0-15 parts of dimethyl silicon oil, 60-100 parts of flame retardant agent, 1-3 parts of cross-linking agent,and 0.5-3 parts of catalyst, wherein the flame retardant agent is compounded based on melamine and one or two of lipophilic magnesium hydroxide and lipophilic aluminum hydroxide. In production and solidification of the flame-retardant room-temperature vulcanized silicon rubber, toxic substances or pungent odors are not generated, so that the preparation method is environmentally friendly and safe.The flame-retardant room-temperature vulcanized silicon rubber has good flame-retardant performance, mechanical property and processing performance, in addition, the raw materials of the flame-retardant room-temperature vulcanized silicon rubber have a wide source range and are low in price. The preparation method of the flame-retardant room-temperature vulcanized silicon rubber is easy and is low-cost.

Description

technical field [0001] The present application relates to the field of rubber, in particular to a flame-retardant room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] RTV silicone rubber has excellent electrical insulation, weather resistance, moisture resistance, shock resistance, compression resistance and physiological inertia, and can be widely used in various industries. RTV silicone rubber can be cured in situ without heating and pressure at room temperature, and it is extremely convenient to use. However, silicone rubber itself is flammable, which limits its application in electrical, electronic, automotive, aerospace and other fields to a certain extent. Therefore, it is of great significance to develop room temperature vulcanized silicone rubber with good flame retardancy. [0003] At present, some progress has been made in the research of flame retardant silicone rubber. There are many varieties of flame retar...

AI Technical Summary

Problems solved by technology

For example, the traditional halogen-containing flame retardants will release toxic hydrogen halide gas during combustion, which is easy to cause harm to the human body and the environment; the price of platinum compound flame retardants is high, and it is easy to cause the instability of silicone rubber properties; Flame retardants (aluminum hydroxide, magnesium hydroxide, etc.) can achieve flame retardant, low smoke, and environmental protection effects, but a large amount of addition is required to obtain a good flame retardant effect, which will affect the mechanical properties and processing properties of silicone rubber. have a greater impact

The Chinese patent CN102876045 published on January 16, 2013 discloses a compound of magnesium aluminum hydrotalcite, ammonium polyphosphate and magnesium hydroxide as a flame retardant, which effectively improves the flame retardancy of room temperature vulcanized silicone rubber. However, the addition of flame retardants is as high as 70 to 130 parts, which will greatly reduce the mechanical properties of silicone rubber.

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