Novel room-temperature vulcanized silicon rubber and cross-linking agent thereof

Abstract

The invention relates to novel room-temperature vulcanized silicon rubber and a cross-linking agent thereof, and discloses application of a phosphonitrilic chloride trimer modifier and a hydrolytic condensation product of the phosphonitrilic chloride trimer modifier as a cross-linking agent in the room-temperature vulcanized silicon rubber. The phosphonitrilic chloride trimer modifier and the hydrolytic condensation product of the phosphonitrilic chloride trimer modifier comprise siloxane structures and phosphonitrile groups, wherein the weight ratio of siloxane groups to phosphonitrile groups is 100:(10-60) along with different hydrolytic condensation degrees of the phosphonitrilic chloride trimer modifier and the hydrolytic condensation product of the phosphonitrilic chloride trimer modifier. The novel room-temperature vulcanized silicon rubber provided by the invention is stable in property, the use environment of the novel room-temperature vulcanized silicon rubber is widened, particularly compared with a similar product, prepared flame-retardant silicon rubber is good in mechanical property, and the mechanical strength of a product can be well improved; the prepared silicon rubber is good in flame retardancy, and the limit oxygen index of the silicon rubber is increased.

Description

technical field [0001] The invention particularly relates to a novel room temperature vulcanized silicone rubber and a crosslinking agent thereof, belonging to the technical field of organic chemistry and organic materials. Background technique [0002] Room temperature vulcanizing silicone rubber (referred to as RTV) refers to a type of silicone rubber that can be vulcanized at room temperature without heating. It is widely used in sealants, adhesives, coatings, mold materials, potting and other fields. Room temperature vulcanized silicone rubber has excellent aging resistance, high insulation, temperature resistance and medium resistance. In addition, it does not require pressure during the entire crosslinking process, the reaction conditions are very mild, and it has little environmental pollution. However, the flame retardant performance of room temperature vulcanized silicone rubber is relatively poor. With the development of science and technology, its disadvantage of ...

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Problems solved by technology

However, under normal circumstances, the addition of these flame retardant additives to silicone rubber will damage the mechanical properties of silicone rubber. For example, adding 25% expandable graphite to silicone rubber will reduce its tensile strength by more than 20%; Adding 30% aluminum hydroxide to silicone rubber will reduce its tensile strength by about 18%.

For room temperature vulcanized silicone rubber, its mechanical properties are poor, which greatly affects its performance

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