Agglomeration method of polybutadiene latex used for acrylonitrile butadiene styrene (ABS) resin

Abstract

An agglomeration method of polybutadiene latex used for acrylonitrile butadiene styrene (ABS) resin is in particular as follows: a static mixer replaces a kettle type agglomeration device in the prior art, intermittent operation is changed into continuous operation to achieve the continuous operation at full liquid, two liquids of the small size polybutadiene latex of about 100 nm and an agglomerating agent are continuously injected into the online static mixer for mixing agglomeration. Agglomerated latex enters into a latex tank provided with a slow rotation spiral stirrer for aging for 10 hours, and after aging, the particle diameter of most of the latex is around 300 nm. The aged latex is used in the graft reaction. Through use of static mixer agglomerating method, completely closed continuous full level operation can be achieved, uniform product quality can be ensured, the oxidation of air to the material can be avoided, the labor intensity can be reduced, and the automation level and operation reliability can be improved. And because of the small occupation space of the online static mixer, the online static mixer is more suitable for the transformation of the old production equipment.

Description

technical field [0001] A polybutadiene latex agglomeration technology for producing ABS resins, specifically agglomerating small-diameter polybutadiene latex with an agglomerating agent to obtain a mixed emulsion of latex particles with a small diameter of 100nm and a latex particle with a large diameter of 300nm. [0002] Background technique [0003] The production of the ABS resin (acrylonitrile-butadiene-styrene copolymer) of prior art is roughly divided into following operations, namely polybutadiene latex preparation, graft polybutadiene latex preparation, styrene- Preparation of acrylonitrile (SAN) copolymer, grafted ABS and SAN are blended and granulated. What the present invention relates to is the first step procedure namely: the preparation of polybutadiene latex. [0004] Polybutadiene latex is a component that provides toughness for ABS resin. In order to obtain excellent impact resistance, it is necessary to obtain polybutadiene latex particle size of appropr...

AI Technical Summary

Problems solved by technology

During the operation of this atmospheric kettle type agglomerator, the latex material is in contact with the air, which will partially oxidize the material. The disadvantage of this agglomeration method is that the agglomeration reaction is not continuous, and the material needs to be processed after each batch agglomeration. Empty, a small amount of emulsion will remain on the surface of the agglomeration kettle and the surface of the agitator. After this part of the emulsion loses moisture, it will form a skin on the surface of the agglomerator. After several batches, the skin will become thicker and thicker. product quality

The countermeasure is to manually clean the agglomerator on a regular basis. The disadvantage of this operation is that the solid waste generated needs to be treated and discharged, resulting in waste of resources, increased labor intensity, differences between batches, and unstable product quality. The automation level is not high, and the kettle agglomerator takes up a lot of space

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