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Preparation of high-amylose regularity polyvinylidene fluoride

A polyvinylidene fluoride and initiator technology, applied in the field of initiator system for polyvinylidene fluoride polymerization with high chain regularity, can solve the problem of poor mechanical properties, processing properties and weather resistance, low structural defects, and unstable terminal groups and other problems, to achieve the effect of good thermochemical stability, high chain regularity and easy control

Active Publication Date: 2010-09-08
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polymer obtained by this method has high crystallinity and low structural defects, the end group is unstable, resulting in poor mechanical properties, processability and weather resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Take the polymerization still of 10L as example, add 7.2kg deionized water and 1kg concentration in the polymerization still of cleaning and be the oxidant cumene peroxide solution and other auxiliary agents of 3.0%; Evacuate, remove oxygen, When the oxygen content is less than or equal to 20ppm, it is qualified; then raise the temperature of the polymerization kettle and add the monomer at the same time. After the kettle temperature and pressure of the polymerization kettle meet the process requirements, use a metering pump to quickly inject 500g of the prepared reducing agent sodium hypochlorite with a concentration of 3.0%. solution, start the polymerization reaction, the temperature is 70°C, the pressure is 3.0Mpa, and then the remaining 3.0% reducing agent sodium hypochlorite solution is poured in at a constant speed with a metering pump. During the polymerization reaction, keep the temperature and pressure of the kettle constant, and stop the reaction...

Embodiment 2

[0015] Embodiment 2: change reducing agent sodium hypochlorite solution concentration to be 2.0%, and consumption is 2kg; The consumption of cumene peroxide is 1kg, and concentration is 3.0%; Oxidant consumption is 2.5% of monomer gross mass, temperature 130 ℃; Reaction Pressure is 5.5MPa Others carry out the same operation with practical example 1.

Embodiment 3

[0016] Embodiment 3: change oxidizing agent to be dialkyl peroxycarbonate, its concentration 3.0%, consumption is 1kg; Reducing agent sodium hypochlorite solution concentration is 3.0%, consumption is 1kg; Oxidant consumption is 2.5% of monomer total mass, temperature 50 ℃; the reaction pressure is 2.5MPa, and other operations are carried out in the same manner as in practical example 1.

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Abstract

The invention relates to a preparation methof of chained polyvinylidene fluoride with high tacticity degree. An initiator used in the polymerization is a redox initiator, an oxidant thereof, i.e., cumene peroxide end group is stable, a reducer thereof, i.e., sodium hypochlorite does not influence the color of a product, and the mol ratio between the oxidant and the reducer is 1:1 to 1:3; the polymerization condition is moderate, the chain of the polymerization product has high tacticity degree and stable end group, therefore, the thermo-chemical stability is good, and the mechanical performance and weathering resistance are significantly improved.

Description

technical field [0001] The invention relates to a polymerization process of polyvinylidene fluoride with high chain regularity, in particular to an initiator system for polymerization of polyvinylidene fluoride with high chain regularity. Background technique [0002] Polyvinylidene fluoride (PVDF) refers to the homopolymer of vinylidene fluoride monomer, with a molecular weight of 400,000-600,000. The repeating unit of the PVDF molecular chain is -CH 2 -CF 2 - The alternate arrangement of groups makes PVDF resin have the characteristics of both fluorine-containing resin and general-purpose resin, and has excellent chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, ultraviolet resistance, and radiation resistance. In addition, PVDF resin has special properties such as higher mechanical strength, better toughness, wear resistance and creep resistance, piezoelectricity and pyroelectricity than ordinary fluorine-containing re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/22C08F4/40
Inventor 王汉利李秀芬刘中平李鑫于克波
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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