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A kind of preparation method of polyvinyl chloride

A polyvinyl chloride and polyvinyl alcohol technology, applied in the field of polyvinyl chloride preparation, can solve the problems of large residual organic impurities and inability to directly recycle, so as to reduce the content of organic residues, prevent high fish eyes, and reduce environmental pollution. Optimized effect

Active Publication Date: 2020-08-04
山西阿科达化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the mother liquor produced by the suspension polymerization method has a large amount of organic impurities and cannot be directly recycled, thereby providing a polyvinyl chloride Preparation

Method used

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  • A kind of preparation method of polyvinyl chloride
  • A kind of preparation method of polyvinyl chloride
  • A kind of preparation method of polyvinyl chloride

Examples

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Effect test

preparation example Construction

[0031] The preparation method of vinyl chloride comprises:

[0032] The calcium carbide and water are reacted in the generator to generate crude acetylene gas, which is oxidized by concentrated sulfuric acid or sodium hypochlorite to remove impurities such as phosphine and hydrogen sulfide in the crude acetylene gas, and refined to obtain refined acetylene gas with a purity of more than 99%. ; Refined acetylene gas and hydrogen chloride react in the converter with catalyzed mercuric chloride as a catalyst to generate vinyl chloride. The vinyl chloride gas is washed with water and alkali to remove the impurity gas, and then pressurized and compressed to make the vinyl chloride gas phase into Liquid phase, the liquid phase vinyl chloride monomer undergoes rectification to further remove impurities such as low boiler hydrogen, nitrogen, acetylene gas and high boiler dichloroethane, and finally obtain vinyl chloride monomer with a purity of 99.99%.

Embodiment 1

[0034] The present embodiment provides a kind of preparation method of polyvinyl chloride, comprising:

[0035] 100Kg vinyl chloride monomer, 0.07Kg dispersant, 0.07Kg peroxydicarbonate bis(2-ethylhexyl) ester (EHP), 0.05Kg ammonium bicarbonate and 120Kg deionized water are introduced into the polymerization reactor, during the reaction Polymerization at a temperature of 56°C and a pressure of 0.85 MPa;

[0036] The dispersant is formed by compounding polyvinyl alcohol with a degree of alcoholysis of 72%, polyvinyl alcohol with a degree of alcoholysis of 78% and polyvinyl alcohol with a degree of alcoholysis of 40% in a ratio of 12:5:1.

[0037] When the pressure drop in the polymerization reactor reaches 0.15MPa (the pressure in the polymerization reactor is 0.70MPa), add 0.07Kg of terminator formed by mixing acetone thiosemicarbazone and bisphenol A according to the mass ratio of 3:1 , solid-liquid separation to obtain PVC product A and mother liquor A.

Embodiment 2

[0039] The present embodiment provides a kind of preparation method of polyvinyl chloride, comprising:

[0040] 100Kg vinyl chloride monomer, 0.07Kg polyvinyl alcohol (alcoholysis degree is 88%), 0.05Kg hydroxypropyl methylcellulose, 0.07Kg cumyl peroxide neodecanoate (CNP), 0.07Kg peroxide Bis(2-ethylhexyl) dicarbonate (EHP), 0.06Kg ammonia water and 150Kg deionized water were introduced into the polymerization reactor, and the reaction temperature was 38°C and the pressure was 0.48MPa. Polymerization reaction;

[0041] When the pressure drop in the polymerization reactor reached 0.05MPa (the pressure in the polymerization reactor was 0.43MPa), add 0.14Kg terminator diethylhydroxylamine, and separate the solid and liquid to obtain PVC product B and mother liquor B.

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Abstract

A polyvinyl chloride preparing method is provided. A vinyl chloride monomer, a dispersant, an initiator, a pH adjusting agent and a solvent in a specific ratio, and a timing for adding a terminating agent into a polymerization reaction system are adopted. On the one hand, the monomer for polymerization is fully polymerized along a main chain, and therefore generation of branch chains is reduced, quality of a polyvinyl chloride product is effectively ensured, and a high 'fish eyes' content, low ageing whiteness, and other phenomena in the product are avoided; and on the other hand, residual amounts of the dispersant, the initiator and the terminating agent in a mother liquor are effectively controlled, and the mother liquor can be circulated and directly participates the polymerization reaction. The method ensures high quality of the polyvinyl chloride, and greatly reduces the content of organic residues in the mother liquor so that the mother liquor can be directly circulated and used,and addition of extra purifying equipment and agents is not needed, and therefore the production cost is saved, and the method is free of pollution to the environment.

Description

technical field [0001] The invention relates to the technical field of polyvinyl chloride preparation, and belongs to a synthesis process of high-quality polyvinyl chloride and a recovery process of its mother liquor. Background technique [0002] Polyvinyl chloride, referred to as PVC (Polyviny chloride), is a vinyl chloride monomer (vinyl chloridemonomer) in peroxides, azo compounds and other initiators, or under the action of light, heat, etc., according to the mechanism of free radical polymerization, polymerized and formed. made polymers. The molecular weight of industrially produced PVC is generally between 50,000 and 110,000, without a fixed melting point. It begins to soften at 80-85°C, becomes viscoelastic at 130°C, and becomes viscous at 160-180°C. PVC is one of the general-purpose plastic products with the largest output in the world. It is widely used in building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/06C08F2/44C08F2/38
CPCC08F2/38C08F2/44C08F114/06
Inventor 李晋文令狐亚九王记才
Owner 山西阿科达化工科技有限公司
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