High-efficiency production method of chlorinated polyethylene with high elongation

Abstract

The invention provides a high-efficiency production method for preparing high-elongation chlorinated polyethylene, which belongs to the technical field of chemical auxiliary production. Including the steps of chlorination reaction, water washing and filtration, primary centrifugation, leaching, secondary centrifugation, and drying; specifically: the chlorination reaction is to pass some chlorine gas below the melting point of polyethylene for reaction, and then heat up to exceed the melting point of polyethylene Above 3°C, chlorine gas accounting for more than 55wt.% of the total chlorine flow is introduced to carry out chlorination reaction; the first centrifugation is to use an acid-resistant centrifuge to remove water from the water-washed materials; Soak in water in an acid-resistant container for more than 4 hours; the secondary centrifugation uses an acid-resistant centrifuge to remove the moisture in the soaked material; the drying uses an acid-resistant boiling drying bed. Through the method, the chlorinated polyethylene with an elongation of more than 1300% can be obtained, and the production energy consumption is lower and the manufacturing cost is lower.

Description

【Technical field】 [0001] The invention relates to the technical field of chemical auxiliary production, in particular to an efficient production method for preparing high-elongation chlorinated polyethylene. 【Background technique】 [0002] Chlorinated polyethylene (CPE) is a polymer material, widely used in plastics, rubber, building materials, electromechanical, automobile, military and other fields due to its good stability, excellent heat resistance, aging resistance, and flame retardancy , has become an important production and living material. Chlorinated polyethylene has two typical structures, one is that chlorine atoms are randomly and uniformly distributed on the macromolecular chain, becoming a saturated elastomer; the other is that chlorine atoms are randomly and unevenly distributed in blocks on the macromolecular chain, Exhibits the behavior of hard plastics. Chlorinated polyethylene with a chlorine content of 25%-45% is a heat-resistant, weather-resistant and...

AI Technical Summary

Problems solved by technology

However, this method is limited to the improvement of the chlorination reaction stage, and the subsequent removal of the acid encapsulated in the particles is still the traditional process of deacidification, neutralization, washing and drying, which is a very energy-intensive production method

The higher the elongation at break of the CPE obtained by this method, it also means that the CPE particles are softer. In order to remove the acid in the pores of the particles, the time spent on neutralization and the amount of water used for washing must be more, and the time used for neutralization needs to be increased. to 18 hours, greatly increasing the energy consumption and time cost of production

If the acid inside the CPE cannot be completely removed, the product will turn yellow when it is finally dried, and the quality of the product will also be affected

Therefore, in order to control the energy consumption of production and ensure the performance of the product, the elongation of the CPE prepared by the embodiment of the invention is 800%-1200%, and the CPE with higher elongation cannot be obtained.

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