Preparation process of chlorinated polyethylene

Abstract

The invention discloses a preparation process of chlorinated polyethylene. The preparation process comprises the following steps: S01, preparing polyethylene into a hydrochloric acid phase suspensionby using hydrochloric acid in a batching kettle, and introducing the suspension into a chlorination reaction kettle; S02, under accurate control of a heat control system, introducing chlorine into thereaction kettle, and after the chlorination reaction is finished, continuously performing deacidifying, washing and discharging by using a planar turntable vacuum filter; S03, continuously feeding adeacidified wet material into a screw screen centrifuge for drying; S04, after the drying, inputting the dried material into a reaction kettle, introducing liquid caustic soda and weak base water forneutralization, after the neutralization, conveying neutralized material into a next screw screen centrifuge for drying, and returning separated weak base water into a weak base water tank; and S05, inputting the dried material into a fluidized drying bed for further drying process treatment, and discharging qualified materials after treatment. According to the invention, two processes of water washing and breaking washing are omitted, the energy-saving effect is remarkable, the product whiteness is high, the particles are uniform, and the chlorine content is uniform.

Description

technical field [0001] The invention belongs to the technical field of polyethylene technology, in particular to a production process of chlorinated polyethylene. Background technique [0002] Polyethylene is a thermoplastic resin obtained by polymerization of ethylene. In industry, it also includes copolymers of ethylene and a small amount of α-olefin. Polyethylene is odorless, non-toxic, feels like wax, and has excellent low temperature resistance. Chemical Good stability, resistant to most acid and alkali erosion, insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation, production process: mainly high-pressure tube method and kettle method. In order to reduce the reaction temperature and pressure, the tubular process generally adopts a low-temperature high-activity initiator to initiate the polymerization system, with high-purity ethylene as the main raw material, propylene / propane as the density regulator, and a high-activi...

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Problems solved by technology

[0003] The existing polyethylene production process has certain disadvantages in the process of use. The quality of the product is not good enough, the utilization rate of chlorine gas is low, it is easy to agglomerate during the reaction, it is not easy to expand the scale of production, and additional washing and breaking washing are required. The weak base has not been recycled to facilitate secondary use, and needs further improvement and strengthening

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