Continuous preparation method of electronic-grade methyl silicone oil

Abstract

The invention relates to a continuous preparation method of electronic-grade methyl silicone oil, which comprises the following steps: pretreating raw materials: carrying out metal complexing agent rectification purification or molecular sieve adsorption treatment and metal complexing agent rectification purification on the raw materials and auxiliary materials in series for use; premixing the rawmaterials: inputting the pretreated raw materials into a screw mixer according to a certain mass ratio, and performing heat preservation and mixing; polymerization: inputting the premixed material into a first-stage static fluidized bed for prepolymerization, and then inputting into a second-stage static fluidized bed for equilibrium polymerization to obtain a semi-finished product; and carryingout low-boiling-point substance removal: inputting the semi-finished product into a film evaporator, primarily removing low-boiling-point substances through first-stage purification, and then inputting the semi-finished product into a short-path low-molecular distiller for second-stage purification to obtain a finished product. The process is a continuous production process, polymerization is stable, the conversion rate is high, the finished product indexes are as follows: the molecular weight distribution coefficient is small, the low-boiling-point substance content is less than 0.20%, the silicon hydroxyl content is low, the Na, K and heavy metal ion content is less than 10ppb, and the application requirements of industries such as electronics, microelectronics and the like can be met.

Description

technical field

[0001] The invention relates to the technical field of preparation of methyl silicone oil, in particular to a continuous preparation method of electronic grade methyl silicone oil. Background technique

[0002] Methyl silicone oil is a kind of organosilicon polymer with flexible chain polysiloxane as the main chain and silicon methyl end cap. According to the difference of polymer quality and specification, it can be used as lubricant, brightener, release agent, Defoamers, plasticizers and other additives are widely used in industries such as machinery, petroleum, electric power, plastics, rubber, coatings, textiles, food and fermentation, medical care and sanitation. At present, domestic commercially available methyl silicone oil is mainly characterized by high content of metal ions such as potassium, sodium and heavy metals, which is close to hundreds of ppm, high content of low boiling substances such as dimethylsiloxane ring body greater than 0.50%, and h...

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