Polymer with low solvent residue and preparation method thereof

Abstract

The invention provides a polymer with low solvent residue and a preparation method thereof. The method comprises the following steps: contacting an organic solution containing a polymer with a thermal medium to obtain a gas-phase component containing an organic solvent and water and a water mixture containing polymer colloidal particles; and dehydrating and drying the water mixture containing the polymer colloidal particles to obtain the low-solvent-residue polymer, the organic solution containing the polymer contains a C5 alkane solvent. According to the invention, n-pentane and / or cyclopentane is used as an organic solvent, and the high-quality polymer with low solvent residue is prepared through elutriation condensation and dehydration drying treatment.

Description

technical field [0001] The invention belongs to the field of polymer preparation, and in particular relates to a polymer with low solvent residue and a preparation method thereof. Background technique [0002] With the improvement of living standards and the advancement of science and technology, people have increasingly strict requirements on the emissions and residues of volatile compounds (VOCs) in industrial products and their production processes. For example, volatile matter is one of the quality indicators of polymer products, which reflects the residual conditions of polymerized monomers and reaction solvents in industrial polymer products. Butadiene rubber, styrene butadiene rubber, ethylene propylene rubber, butyl rubber, halogenated butyl rubber, silicone rubber, polyisoprene rubber, neoprene rubber, hydrogenated nitrile rubber, SBS, SEBS, SIS, SEPS, PE, PP, Polymers such as PVC, ethylene-propylene copolymers, polyisobutylene, polyacrylonitrile, and polystyrene w...

AI Technical Summary

Problems solved by technology

The existing butadiene rubber production process adopts n-hexane or solvent oil containing hexane as the reaction solvent, and the post-treatment of the water precipitation coagulation method, the obtained rubber particles are dehydrated and dried, and the drying temperature is too low to cause the volatile content of the finished rubber to be unqualified; If it is too high, it will produce plasticized glue, which will greatly reduce the elasticity of the rubber particles and become plastic, and even cause a fire accident in the drying box

If the volatile content of butadiene rubber is increased to 1.2wt%, the production energy consumption will be greatly improved, and if the volatile content of butadiene rubber is controlled within 0.2wt%, it will cause plasticizing reaction in the butadiene rubber block Therefore, the staff must control the volatile content of butadiene rubber within the range of 0.3-0.6wt%.

It can be seen that on the existing butadiene rubber production equipment, the product volatile matter control effect is not ideal, which has seriously affected the product quality with butadiene rubber as raw material. The volatile matter mainly includes moisture and residual solvent, and the butadiene rubber with high solvent residue is used as During the subsequent use and processing of raw materials, solvents will volatilize into the operating space in the form of VOCs, polluting the environment

[0004] The qualified rate of volatile content of the polymer products prepared by the current method is still low, especially the residual amount of solvent is large, which greatly affects the high-grade product rate of the finished rubber and becomes a bottleneck restricting product quality.