Phosphorus-silicon polymer-containing flame-retardant room-temperature vulcanized silicone rubber composition and preparation method thereof

Abstract

The invention discloses a phosphorus-silicon polymer-containing flame-retardant room-temperature vulcanized silicone rubber composition and a preparation method thereof. The composition is prepared from the following raw materials in parts by mass: 100 parts of polysiloxane, 0.1-20 parts of cross-linking agent, 10-40 parts of inorganic packing, 10-100 parts of reinforcing agent and 0.1-20 parts of phosphorus-silicon polymer, wherein the structural formula of the phosphorus-silicon polymer is as shown in the formula I. When being used together, the phosphorus-silicon polymer and the inorganic packing are good in flame retardance effect, halogen-free and environment-friendly, the use amount of the inorganic packing can be reduced under the condition that an equal flame retardance grade is achieved, the phosphorus-silicon polymer self has a catalysis function in curing the system, no extra catalyst is needed, the addition amount of the phosphorus-silicon polymer is small, and the mechanical property is slightly affected. The formula I is as shown in the specification.

Description

technical field The invention belongs to the field of materials, and in particular relates to a phosphorus-silicon polymer-containing flame-retardant room temperature vulcanized silicone rubber composition and a preparation method thereof. Background technique Due to its special structure, silicone rubber has both the properties of inorganic and organic materials. Compared with ordinary rubber, it has the advantages of non-toxic, odorless, high and low temperature resistance, weather resistance, ozone resistance, and good electrical insulation. It is widely used in aviation, Aerospace, electronics, electrical appliances, construction, automobiles, chemicals and other fields. However, the silicone rubber molecular chain contains a large amount of C and H, and its limiting oxygen index is less than 21%. It is flammable and will continue to burn when exposed to an open flame, which greatly limits its application in fire prevention and leakage prevention. Traditionally, the fl...

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Problems solved by technology

In actual production and application, a single flame retardant will always have defects of one kind or another, and it is difficult to meet higher and higher requirements with a single flame retardant. Combining two or more flame retardants can be combined The advantages of the above flame retardants can achieve the purpose of reducing the amount of flame retardants, improving the flame retardant performance, processing performance and physical and mechanical properties of materials.

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