New process for industrialized production of ultralow-oxygen narrow-MWD (Molecular Weight Distribution) polydimethylsilane

Abstract

The invention provides a new process for industrialized production of ultralow-oxygen narrow-MWD (Molecular Weight Distribution) polydimethylsilane. The ultralow-oxygen narrow-MWD polydimethylsilane is synthesized by adopting a Wurtz method. The new process comprises the following processing steps of: firstly drying a solvent required for reaction, carrying out secondary rectification for dimethyl dichlorosilane in advance to improve the purity of dimethyl dichlorosilane, installing a temperature and humidity controller in a factory to ensure that the environmental humidity is below 40%, and the like, so that the oxygen content in produced polydimethylsilane is minimized (only 0.1%), the polydimethylsilane can reach the product performance of developed countries, and more qualified silicon carbide ceramic fiber can be prepared; an external multi-stage cooling circulatory system is adopted to timely discharge heat released in the Wurtz synthesis method so as to guarantee safe and smooth industrial production; a reactor has the dual advantages of the stability of glass and metal strength, thus being excellent corrosion-resistant equipment, fully meeting the requirements of the Wurtz method, and realizing the industrialized application of the Wurtz coupling method to synthesizing polydimethylsilane.

Description

technical field [0001] The invention relates to an industrialized production process of polymer materials, in particular to a new industrialized production process of polydimethylsilane with ultra-low oxygen and narrow molecular weight distribution. Background technique [0002] Polydimethylsilane is a polymer material whose main chain is composed of silicon atoms. Due to Si's low electronegativity and 3d empty orbitals, electrons can be widely delocalized along the Si-Si main chain, and it also contains abundant Si-H bonds, so that polydimethylsilane can be used in photoconductive, Light-emitting diodes, nonlinear optical materials, and SiC ceramic preparation and functional materials all have very good application prospects. As a new type of functional polymer material, polydimethylsilane is of great significance both in theory and in practice. Polydimethylsilane chemistry has become a hot spot in the field of organosilicon. Research is very active. With the deepening o...

AI Technical Summary

Problems solved by technology

Among them, the synthesis of polysilane by Wurtz coupling method is the earliest and most commonly used method for synthesizing polysilane. The polysilane synthesized has stable performance. At the same time, the Wurtz method has the advantages of simple method and strong operability; but due to the violent reaction of this method , releases a lot of heat and is difficult to control, so the synthesis scale is very small, generally the output of each synthesis is only 10 g~15 g, and the yield is only about 50%, which is not suitable for industrial production

Images