A kind of preparation method of polycarbosilane

Abstract

The invention provides a method for preparing polycarbosilane. The method comprises the following steps: filling an inert gas into a reaction kettle, adding metal magnesium, an organic solvent and iodine, adding chloromethylchlorosilane dropwise into the reaction kettle, React at 25°C for 3 hours to generate a polycarbosilane intermediate; add a reducing agent to the reaction kettle, the reducing agent is preferably sodium hydride, and react at 25°C for 5 hours to generate a milky white rubber-like polycarbonate Silane; liquid separation, filtration, organic phase washing and drying are carried out on the generated polycarbosilane rubber solid, and the heated polycarbosilane solid is discharged after being pulverized by the feeding device, and the generated polycarbosilane solid is processed by the feeding device The crushing and guiding material solves the problem that the unloading component is easily blocked in the prior art, and the speed of unloading can be adjusted according to the production efficiency of the material processing equipment to make it reach a reasonable state.

Description

technical field [0001] The invention relates to a preparation method of organosilicon polymers, in particular to a preparation method of polycarbosilane. Background technique [0002] Polycarbosilane (PCS) is an organic precursor widely used in the preparation of special fibers (such as sic fibers) and multiphase ceramics. sic fibers have high strength and hardness, high thermal stability and oxidation resistance, and low thermal expansion. The advantages of coefficient and low density, high temperature stability (chemical, microstructural and mechanical stability) of sic fibers in inert and oxidizing environments, coupled with their excellent mechanical properties (high breaking strength, stiffness and low creep rate, etc.) Makes sic fibers the best alternative for producing structural composites with a wide range of applications ranging from heat exchangers and hot gas filters to power production and aerospace machinery components. [0003] At present, the sic material di...

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Problems solved by technology

[0003] At present, the sic material prepared directly from polycarbosilane has defects such as insufficient density, low performance, and large grain size at high temperature, which reduces the performance of the product. Therefore, it is necessary to pulverize the prepared polycarbosilane material during blanking. However, small particles of polycarbosilane particles will be blocked after crushing, resulting in poor feeding, which is in urgent need of improvement

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