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Method for producing high-degree of polymerization polyvinyl chloride resin by using suspension method

A technology of polyvinyl chloride resin and high degree of polymerization, which is applied in the field of production of high degree of polymerization polyvinyl chloride resin by suspension method, which can solve the problems of being unable to adapt to high-grade and special processing applications, low compression permanent deformation, and large fluctuations in product quality. Achieve the effects of regular particle shape, low product energy consumption and large batch output

Inactive Publication Date: 2012-07-04
HANGZHOU ELECTROCHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinyl chloride (PVC) resin is divided into general-purpose polyvinyl chloride resin and high-polymerization polyvinyl chloride resin. General-purpose polyvinyl chloride resin has some defects, and it cannot adapt to high-end and special processing applications, while high-polymerization polyvinyl chloride resin Vinyl resin (usually refers to the polyvinyl chloride resin with an average degree of polymerization above 1700 or a slight cross-linked structure between its molecules) improves the processing performance of general-purpose polyvinyl chloride resin, and is more suitable for processing extra soft products with high resilience. , high toughness, high imitation rubber and matte products and other products, so that the products have higher tensile strength, tear strength, elongation at break, wear resistance, high temperature resistance and low temperature resistance, Features such as low compression set, excellent plasticizer retention and hardness versus temperature, and unique rubber-like elasticity
The production methods of high-polymerization polyvinyl chloride resin mainly include low-temperature method and chain extender method. The low-temperature method has difficulty in heat transfer caused by small temperature difference between inside and outside the kettle, difficult reaction control, long reaction time, and can only be used at low temperature. Disadvantages such as seasonal production; the chain extender method overcomes the above-mentioned defects of the low temperature method, however, its production equipment is generally 30m 3 Kettle system or smaller 13.5m 3 and 7m 3 Kettle system, the degree of automation of the production device is low, and the product quality fluctuates greatly
The current common polymerization kettle device in the domestic PVC industry is 70m 3 Polymerization kettle system, but general-purpose polyvinyl chloride resin is generally produced, and there is no report on the system using chain extender method to mass-produce polyvinyl chloride resin with high polymerization degree

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The DCS control system automatically controls 5kg of ammonium bicarbonate, 32 tons of hot ion-free water, 25 tons of vinyl chloride monomer, 100kg of PVA, 12kg of BNP and 7kg of CNP materials, through the isothermal water feeding technology and the whole closed feeding technology, in the DCS system Under control, automatically join 70m 3 In the polymerization tank, when the polymerization feeding is completed, the reaction temperature reaches 36°C. Under the condition of stirring, the temperature is controlled at 36°C, react for 14 to 16 hours, add 25kg of HER terminator to terminate the polymerization reaction, obtain a slurry of polyvinyl chloride resin with a high degree of polymerization, and remove unreacted vinyl chloride monomer by steam stripping , after centrifugal dehydration and drying, the finished product can be obtained. The HER is the trade name of the terminator, which can be purchased directly from the market, and the manufacturer is Hangzhou Hengxin C...

Embodiment 2

[0019] The DCS control system automatically controls 5kg of sodium carbonate, 32 tons of hot ion-free water, 25 tons of vinyl chloride monomer, 90kg of PVA, 10kg of EHP and 6.5kg of CNP materials, through the isothermal water feeding technology and the whole closed feeding technology, in the DCS system Under control, automatically join 70m 3 In the polymerization tank, when the polymerization feeding is completed, the reaction temperature reaches 38°C. Under the condition of stirring, the temperature is controlled at 38°C, react for 13-15 hours, add 25kg of HER terminator to terminate the polymerization reaction, obtain a slurry of polyvinyl chloride resin with a high degree of polymerization, and remove unreacted vinyl chloride monomer by steam stripping , after centrifugal dehydration and drying, the finished product can be obtained.

Embodiment 3

[0021] The DCS control system automatically controls 5kg of ammonium bicarbonate, 32 tons of hot ion-free water, 25 tons of vinyl chloride monomer, 80kg of PVA, 9kg of BNP and 5kg of CNP materials, through the isothermal water feeding technology and the whole closed feeding technology, in the DCS system Under control, automatically join 70m 3 In the polymerization tank, the reaction temperature reached 40.5°C when the polymerization feeding was completed. Under the condition of stirring, the temperature is controlled at 40.5°C, react for 10 to 12 hours, add 20kg of HER terminator to terminate the polymerization reaction, obtain a slurry of polyvinyl chloride resin with a high degree of polymerization, and remove unreacted vinyl chloride monomer by stripping , after centrifugal dehydration and drying, the finished product can be obtained.

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Abstract

The invention discloses a method for producing high-degree of polymerization polyvinyl chloride resin by using a suspension method, which comprises the following steps of: step 1, charging by adopting a constant-temperate water feeding technology, a whole-process airtight feeding technology and a DCS (Distributed Control System) automatic control technology; step 2, producing the high-degree of polymerization polyvinyl chloride resin by adopting a low-temperature method; and step 3, obtaining the high-degree of polymerization polyvinyl chloride resin with a degree of polymerization of 1700-3000. With the adoption of the method for producing the high-degree of polymerization polyvinyl chloride resin by using the suspension method, the high-degree of polymerization polyvinyl chloride resin with a degree of polymerization of 1700-3000 can be produced in a 70 m<3> polymerization kettle system, has the advantages of low energy consumption, large batch production and stable quality and can be produced in the whole year.

Description

technical field [0001] The present invention relates to the production method of polyvinyl chloride resin of high degree of polymerization, especially in 70m 3 A method for producing polyvinyl chloride resin with a high degree of polymerization by a suspension method is adopted in a polymerization kettle system. Background technique [0002] Polyvinyl chloride (PVC) resin is one of the five general-purpose plastics, widely used in industry, agriculture, construction and other fields. Polyvinyl chloride (PVC) resin is divided into general-purpose polyvinyl chloride resin and high-polymerization polyvinyl chloride resin. General-purpose polyvinyl chloride resin has some defects, and it cannot adapt to high-end and special processing applications, while high-polymerization polyvinyl chloride resin Vinyl resin (usually refers to the polyvinyl chloride resin with an average degree of polymerization above 1700 or a slight cross-linked structure between its molecules) improves the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/06C08F2/20C08F2/42C08F6/24
Inventor 孔万力孙熊杰俞黎良陈浙夏勇
Owner HANGZHOU ELECTROCHEM GROUP
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