Emulsion polymerization reaction kettle

Abstract

The invention discloses an emulsion polymerization reaction kettle. The reaction kettle comprises a vertical cylinder, an upper sealing head of the cylinder is provided with a material inlet, a gas inlet and a gas outlet, the gas outlet is connected with the vacuum system, and a lower sealing head of the cylinder is provided with a material outlet; a stirring shaft insertion opening is formed in an upper sealing head of the barrel, one end of the stirring shaft is connected with the power device, the other end of the stirring shaft is connected with the four-blade ring type stirrer, and the stirring shaft is connected with the barrel through a mechanical seal. Blades on the lower portion of the four-blade ring type stirrer are large in size, the liquid discharging capacity of the blades can be improved, the axial flow effect in the reaction kettle can be enhanced, blades on the upper portion of the four-blade ring type stirrer are arranged to be in a sawtooth shape, the shearing capacity of the blades to fluid can be improved, in addition, the height of the blades of the four-blade ring type stirrer is larger than that of the reaction kettle, and therefore the stirring efficiency is improved. And various load working conditions can be adapted. The method is used for producing polybutadiene latex, the axial temperature difference is small, the particle size is reduced to 180-500 nm, the consumption of an emulsifier in an oil phase is increased, and the consumption of a refrigerant is reduced.

Description

technical field [0001] The invention belongs to the technical field of emulsion polymerization, and relates to important equipment in the synthesis process of ABS resin, in particular to an emulsion polymerization reactor for synthesizing polybutadiene latex and a production method of polybutadiene latex. Background technique [0002] In recent years, with the requirements of light weight and high performance of electronic appliances, household consumer goods and automobiles, people's demand for high-performance materials is increasing day by day. Among them, ABS resin, as a high-performance material with superior performance, has strong hardness , good heat resistance, strong impact resistance, good light transmission and easy processing, and polyethylene, polypropylene, polyvinyl chloride, polystyrene and called five general resins. ABS resin is a terpolymer of acrylonitrile, butadiene and styrene. Emulsion graft polymerization is the most common and mature process for sy...

AI Technical Summary

Problems solved by technology

But in the production process of polybutadiene latex, the dispersed phase butadiene needs to continue to replenish along with the reaction, and the liquid level in the whole reaction process reactor increases from 40% to 80%, which causes most of the reaction process Within a short period of time, the agitator used for liquid shearing above the reactor cannot be fully utilized, and eventually the particle size and particle size distribution of the product in the reactor cannot meet the requirements of the next process. The size of the paddle blades is small, resulting in a small amount of liquid discharged by the paddles, the overall flow rate of the liquid phase in the reactor is low, and the heat transfer effect is poor

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