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Method for avoiding 'fisheye' generated in polyvinyl chloride production process

A production process, polyvinyl chloride technology, applied in the field of polyvinyl chloride production technology, can solve the problems of low-temperature flexibility, tensile strength, elongation, and aesthetics of plastic products that affect insulation performance, and reduce viscosity. Kettle phenomenon, shorter polymerization time, and faster polymerization

Inactive Publication Date: 2017-10-10
CHUZHOU HONGYUAN SPRAYING
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  • Abstract
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  • Application Information

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Problems solved by technology

The existence of "fish eyes" not only affects the aesthetics of plastic products, but also affects their quality; "fish eyes" in film products will affect properties such as tensile strength and elongation; "fish eyes" in cable products will affect Affect insulation performance and low temperature flexibility, once the "fish eye" falls off, it will also lead to voltage breakdown accidents

Method used

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Embodiment Construction

[0015] A method for avoiding "fish eyes" in the production process of polyvinyl chloride, comprising the following specific steps:

[0016] (1) Add 60Kg of constant-temperature water heated to 56°C and 50Kg of liquid vinyl chloride monomer into the reactor, close the reactor, and repeat the stirring cycle to vacuumize the inside of the reactor to remove oxygen as much as possible;

[0017] (2) Add 17g of polyvinyl alcohol with a degree of alcoholysis of 70% and 33g of polyvinyl alcohol with a degree of alcoholysis of 30% into the reactor at a constant temperature, and then add 16g of bis(2-ethylhexyl peroxydicarbonate) ) with 8g cumyl peroxyneodecanoate, 0.5g carboxymethyl cellulose and 1g fluorocarbon surfactant FC-15 to polymerize, adjust the pH of the system to 7, stir and react for 4 hours, and finally add 20g of cold water at 2°C terminate the reaction;

[0018] (3) Exhaust the reaction system and perform stripping to remove residual vinyl chloride and perform centrifuga...

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Abstract

The invention discloses a method for avoiding 'fisheye' generated in a polyvinyl chloride production process. According to an existing process for producing polyvinyl chloride by a suspension method, raw material quality is controlled, auxiliaries and a formula are optimized, process conditions are optimized and the like to obtain polyvinyl chloride with high polymerization speed, high porosity and reduced 'fisheye' generation rate, and product quality is improved.

Description

technical field [0001] The invention relates to the technical field of polyvinyl chloride production technology, in particular to a method for avoiding "fish eyes" in the production process of polyvinyl chloride. Background technique [0002] The "fish eye" in the quality index of polyvinyl chloride finished products by suspension method refers to the transparent bright spots formed on plastic products by some polyvinyl chloride particles due to difficult plasticization or non-plasticization under thermal plasticization processing conditions. "Fisheye" has always been one of the key quality indicators for the key control of the suspension PVC production process and the plasticization process. The existence of "fish eyes" not only affects the aesthetics of plastic products, but also affects their quality; "fish eyes" in film products will affect properties such as tensile strength and elongation; "fish eyes" in cable products will affect It will affect the insulation perform...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/00C08F4/36C08F4/34C08F2/20
CPCC08F114/06C08F2/00C08F2/20C08F4/34C08F4/36
Inventor 王新志张凯郑海迪
Owner CHUZHOU HONGYUAN SPRAYING
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