Low-thermal-conductivity flame-retardant fireproof silicone rubber composite material and preparation method thereof

Abstract

The invention provides a low-thermal-conductivity flame-retardant fireproof silicone rubber composite material. The material, in parts by weight, comprises 60-80 parts of methyl vinyl silicone rubber,20-40 parts of methyl vinyl phenyl silicone rubber, 15-25 parts of hydrophobic silica aerogel powder, 20-30 parts of metal oxide powder, 5-10 parts of a fluxing agent, 3 parts of a crosslinking aid,20-30 parts of fumed silica, 3 parts of hydroxyl silicone oil, 20-30 parts of an organic-inorganic compound flame retardant and 1 part of an antioxidant. The metal oxide is selected from one or more of ferric oxide, calcium carbonate and zirconium dioxide; the organic-inorganic compound flame retardant is selected from a mixture of modified pentaerythritol phosphate and silane coupling agent modified aluminum hydroxide; and the modified pentaerythritol phosphate is prepared by reacting pentaerythritol phosphate modified by phosphorus oxychloride with aminopropyl-terminated dimethyl silicone oil. The composite material has good fireproof and heat-insulating effects and mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant and fire-resistant silicone rubber materials, and in particular relates to a low thermal conductivity flame-retardant and fire-resistant silicone rubber composite material and a preparation method thereof. Background technique [0002] Silicone rubber is an organic elastomer material prepared by high relative molecular weight polysiloxane through reinforcement, vulcanization and other processes. During the combustion process of silicone rubber matrix, no toxic gas is generated, and the internal -Si-O bond is transformed into a continuous network. SiO 2 Layer, preventing further ablation, itself has a porcelain-forming effect, and the preparation of porcelain-resistant flame-retardant refractory materials with organosilicon polymers is currently the main research direction. Compared with the traditional magnesium oxide mineral insulated fireproof cable and the fireproof cable wrapped with ...

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Problems solved by technology

However, this type of flame retardant has poor compatibility with organic silicon. Simply using Al or Mg as a flame retardant system will cause a decrease in the mechanical properties of the fire-resistant rubber and a change in the bonding force with the support material due to the excessive addition of the flame retardant. Difference

[0004] Although the existing porcelainable fireproof silicone rubber materials have certain ablation resistance and flame retardancy properties, there are still a series of problems in the actual production and application process, such as the poor performance of the porcelain filler in the system under high temperature ablation state , the ceramic layer is easy to crack, easy to vibrate and fall off, poor heat insulation, and loses the protective effect on internal materials; highly filled inorganic flame-retardant fillers affect the porcelain-forming performance of the system, further reducing the mechanical properties of silicone rubber; the dispersion of each component is poor , coupled with the traditional thermal vulcanization method, resulting in poor overall crosslinking of silicone rubber and large local performance deviations

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