Preparation device and method for polysilazane

Abstract

The invention relates to a preparation device and a method for polysilazane, belongs to the field of polymer chemical preparation, and solves the problem of mass and heat transfer in a ''slurry'' material system caused by a large amount of ammonium chloride formed by reaction of chlorosilane and ammonia gas in the prior art. The preparation device comprises a feeding device, a tubular reaction device, a filtering device and a distillation device; the feeding device is in communication with the tubular reaction device, raw materials can be introduced into the tubular reaction device through thefeeding device for reaction; the tubular reaction device is in communication with the filtering device, and the filtering device can perform solid-liquid separation on a substance that enters the filtering device through the tubular reaction device; the filtering device is in communication with the distillation device, and the distillation device may distill a substance that has enters the distillation device through the filtering device to obtain a first light component substance and a first heavy component substance. The preparation device can stably prepare the polysilazane in a large batch at room temperature, and can carry out condensation recovery on an inert solvent, thereby realizing recycling of the inert solvent.

Description

technical field [0001] The invention relates to the field of polymer chemical preparation, in particular to a polysilazane preparation device and method. Background technique [0002] Polysilazane is a class of compounds containing Si-N bonds. In recent years, with the development of aerospace and other fields, it is very important to bond high-temperature resistant ceramics, coatings, fibers and silicones prepared from polysilazane. The demand for sealing materials is getting higher and higher, and the demand is also increasing. Therefore, it is necessary to develop an economical, efficient, and controllable batch-stable preparation method of polysilazane to meet the needs of today's national economic development. [0003] The preparation method of polysilazane is mostly obtained from the reaction of chlorosilanes with different structures and ammonia under certain conditions. Due to the easy hydrolysis characteristics of Si-N of polysilazane, the whole reaction process n...

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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a polysilazane preparation device and method to solve the problem of mass transfer and heat transfer in the "slurry" system caused by a large amount of ammonium chloride generated by the reaction of chlorosilane and ammonia, Overcome the technical problem that ammonium chloride particles generated in situ in the "slurry" system coat chlorosilane reactants and polysilazane products, resulting in low reaction yields, breaking through the difficulty in realizing polysilazane in the prior art The technical bottleneck of large-scale stable preparation of

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