Postprocessing method for production of butyl rubber

Abstract

The invention provides a postprocessing method for production of butyl rubber. The postprocessing method for the production of the butyl rubber includes following steps: a) sequentially performing vibration dewatering, extrusion dewatering and pre-expansion drying on rubber particle water so as to obtain a rubber material after being processed; b) using a double screw expansion drying machine forperforming dewatering and drying on the obtained rubber material after being obtained and processed in the step a) at temperature of 100 DEG C-130 DEG C and under pressure of 15bar-110bar, performingthree-stage drying and temperature reduction when the rubber material enters a fluidized bed after flash evaporation is completed, and obtaining a rubber material containing water below 0.3%, whereinthe double screw expansion drying machine uses high pressure inert gas as a conveying medium, and temperature in the three-stage drying and temperature reduction is respectively 80 DEG C-90 DEG C, 80DEG C-90 DEG C and 40-55 DEG C; and c) after pressing the rubber material, containing the water below 0.3%, obtained in the step b), into blocks, packing the blocks, and then obtaining the butyl rubber product. The postprocessing method for the production of the butyl rubber adopts specific steps, conditions and parameters, realizes good interaction, reduces temperature of the rubber material on the premise of reducing water content of the rubber material, and then reduces running temperature of the fluidized bed on a following route, thereby improving production capacity of a drying line.

Description

technical field [0001] The invention relates to the technical field of butyl rubber, in particular to a post-treatment method for producing butyl rubber. Background technique [0002] Butyl rubber has excellent air tightness, aging resistance, corrosion resistance, electrical insulation, puncture resistance, etc., and is mainly used in inner tubes, vulcanized bladders, anti-corrosion linings, electrical insulation materials, waterproof coils, and pharmaceutical products And chewing gum base and other industries. [0003] The process for producing butyl rubber is to copolymerize isobutylene and a small amount of isoprene with aluminum chloride as a catalyst in a methyl chloride solution at low temperature to obtain butyl rubber products; while unreacted monomers and solvents The pure solvent is recovered by flashing, compressing and rectifying, and then the pure solvent is recycled back to the polymerization section, and the isobutylene is sent out of the boundary area for r...

AI Technical Summary

Problems solved by technology

However, using this equipment for post-treatment of butyl rubber, the process temperature is as high as 130 ° C ~ 160 ° C, the rubber material is rubbed by the twin-screw, and then blown to the fluidized bed by the conveying wind. During this period, due to the high process temperature, some The following disadvantages: (1) lead to high rubber temperature, increasing Mooney degradation; (2) easy to form plasticized rubber in the fluidized bed, increasing the scrap rate; (3) high temperature leads to packaging film sticking, affecting the use of downstream users ;(4) Due to the difficulty in controlling volatile matter, production capacity is limited; (5) High temperature increases the risk of discoloration of rubber blocks during storage or use by downstream customers, which has a negative impact on the company's brand

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