Preparation process of chlorinated polyvinyl chloride resin

Abstract

The invention discloses a method for preparing chlorinated polyvinyl chloride resin. The invention adopts water or hydrochloric acid as the suspending medium, and polyvinyl chloride is suspended in the liquid phase with a solid content (wt) not higher than 30%. Control the chlorine flow rate and chlorination reaction temperature of the three stages of chlorination, and pass chlorine gas that does not exceed 20% of the theoretical chlorine content to make the chlorine content of the resin reach 66-70%. After acid filtration, neutralization, water washing, and centrifugation , drying, to obtain high heat-resistant stability suitable for the production of corrosion-resistant, high-temperature pipe resin.

Description

technical field

[0001] The invention relates to a method for producing chlorinated polyvinyl chloride resin (CPVC), especially a water phase suspension chlorination method. Background technique

[0002] Chlorinated polyvinyl chloride resin (CPVC) is an important polymer material. According to different production processes, its chlorine content is also different, and its application is also different. The chlorine content of CPVC produced by solvent method is generally 62-65%. It is mainly used for coatings and adhesives. The water-phase suspension chlorination technology is adopted. The chlorine content of CPVC resin after chlorination is 66-70%, because the resin has It is characterized by high temperature resistance, corrosion resistance and good dielectric properties. It is widely used in hot water pipes, power pipes, oil pipelines and chemical corrosion-resistant pipes. It is especially suitable for corrosion-resistant and high-temperature-resistant pipes for electrolyt...