Flame-retardant high-temperature-resistant radiation-resistant silicone rubber and preparation method thereof

Abstract

The invention provides flame-retardant high-temperature-resistant irradiation-resistant silicone rubber. The silicone rubber comprises the following components, by mass, 100 parts of raw methyl phenylvinyl silicone rubber, 10-60 parts of raw methyl vinyl silicone rubber, 1-10 parts of polyorganometallosiloxane, 2-10 parts of a structured control agent, 20-70 parts of fumed silica, 0.5-5 parts ofhigh vinyl phenyl silicone oil, 0.1-5 parts of a nanometer heat-resistant agent, 1-5 parts of nanometer radiation-resistant particles, 5-60 parts of a heat-resistant modified additive, 1-5 parts of aheat-resistant modified nitrogen flame retardant, 0.005-1 part of a platinum complex and 0.5-3.0 parts of a vulcanizing agent. The invention further provides a preparation method of the flame-retardant high-temperature-resistant irradiation-resistant silicone rubber. According to the flame-retardant high-temperature-resistant irradiation-resistant silicone rubber and the preparation method thereof, the prepared silicone rubber has very good high temperature resistance and irradiation resistance, is low-smoke, halogen-free, flame-retardant and water-resistant, and can be used as a nuclear powercable insulating material.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a flame-retardant, high-temperature, radiation-resistant and radiation-resistant silicone rubber and a preparation method thereof. The preparation material can be used in occasions such as nuclear power plant cables. Background technique [0002] General-purpose methyl vinyl silicone rubber has a high temperature resistance level, and has the advantages of softness, water resistance, and good processing performance, but its flame retardancy is poor, and it is prone to aging and failure when it is irradiated by strong rays. It is used in some key components such as nuclear power plants and aviation. Applications are limited. Phenyl silicone rubber has good radiation resistance, and it gradually increases with the increase of phenyl content. However, phenyl silicone rubber with high phenyl content has poor processing performance, is not easy to vulcanize, has general high temp...

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Problems solved by technology

[0005] Chinese patent CN101717581B discloses that methyl vinyl silicone rubber is used as the base material, and by adding radiation resistant agent rare earth oxide, it passes the 500kGy irradiation test, but it is not flame retardant, and contains lead, and the amount of radiation agent added is large; China Patent CN106854363A discloses that phenyl silicone rubber is used as the base material, melamine formaldehyde resin is added, and aluminum hydroxide and magnesium hydroxide are used as flame retardants to obtain highly flame-retardant silicone rubber materials, but it does not mention high-temperature resistance and flame-retardant properties; Chinese patent CN 104312152A uses phenylene silicone rubber and borosilicate rubber to compound more fillers, which has good high temperature resistance and mechanical properties, but does not mention flame retardancy; Chinese patent CN103146199B and CN 103102690 A both use phosphate ester flame retardant methyl Phenyl vinyl silicone rubber, good flame retardancy and mechanical properties, but no mention of radiation resistance, and such flame retardant systems usually have mediocre high temperature resistance

[0006] At present, the performance of silicone rubber materials cannot achieve long-term high temperature resistance (especially 60 years at 130°C), radiation resistance (300kGy gamma rays), and at the same time meet the comprehensive requirements of good mechanical and physical properties, low smoke, halogen-free, flame retardant, and water resistance. Technical breakthroughs in key technologies are required to broaden their application in special fields such as nuclear power and aerospace

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