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High alkali resistance 1,1-diofluoroethylene polymer and preparation method

A difluoroethylene, alkali-resistant technology, applied in the field of high alkali-resistant 1,1-difluoroethylene polymer and its preparation, can solve the problem of reducing the temperature range of the copolymer, reducing the rigidity of PVDF, wear resistance and hardness Decrease and other problems, to achieve the effect of controllable efficiency, increased mode, and improved strong alkali resistance

Active Publication Date: 2022-04-26
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these copolymers do improve the alkali resistance of polyvinylidene fluoride to a certain extent by increasing the fluorine content, but at the same time, the melting temperature of the copolymer is also significantly lower than that of PVDF homopolymer, which reduces the use temperature range of the copolymer; And the rigidity of PVDF is reduced, and the wear resistance and hardness are significantly reduced

Method used

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  • High alkali resistance 1,1-diofluoroethylene polymer and preparation method
  • High alkali resistance 1,1-diofluoroethylene polymer and preparation method
  • High alkali resistance 1,1-diofluoroethylene polymer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In a 100L vertical reactor, add 50L of deionized water, 74.25g of polyvinyl alcohol dispersant, 0.75g of calcium hydroxyphosphate as the inorganic dispersant, 150g of ethyl acetate, 300g of disodium hydrogen phosphate, close the reactor, and use Nitrogen was purged for 30 minutes until the oxygen content in the reactor was less than 20ppm. Then start stirring, raise the temperature in the reactor to 80° C., add vinylidene fluoride monomer until the pressure in the reactor reaches 6 MPa, and add 10 g of initiator potassium persulfate to start the reaction. Continue to add vinylidene fluoride monomer to maintain the pressure, and add 2 g of potassium persulfate every half an hour until the amount of VDF monomer added reaches 15000 g, and maintain the temperature to consume residual monomer. Stop stirring after 30 min, vent to normal pressure, and collect the product after post-treatment.

Embodiment 2

[0029] In a 100L vertical reactor, add 50L of deionized water, 112.5g of polyvinyl alcohol dispersant, 15g of calcium hydroxyphosphate as an inorganic dispersant, 3g of ammonium carbonate, and 150g of ethyl acetate, close the reactor, and purge with nitrogen 30min until the oxygen content in the reactor is less than 20ppm. Then start stirring, raise the temperature in the reactor to 95° C., add vinylidene fluoride monomer until the pressure in the reactor reaches 6 MPa, and add 10 g of initiator potassium persulfate to start the reaction. Continue to add vinylidene fluoride monomer to maintain the pressure, and add 2 g of potassium persulfate every half an hour until the amount of VDF monomer added reaches 15000 g, and maintain the temperature to consume residual monomer. Stop stirring after 30 min, vent to normal pressure, and collect the product after post-treatment.

Embodiment 3

[0031] In a 100L vertical reactor, add 50L of deionized water, 150g of polyvinyl alcohol dispersant, 22.5g of calcium hydroxyphosphate as an inorganic dispersant, 3g of ammonium carbonate, and 150g of ethyl acetate, close the reactor, and purge with nitrogen 30min until the oxygen content in the reactor is less than 20ppm. Then start stirring, raise the temperature in the reactor to 90° C., add vinylidene fluoride monomer until the pressure in the reactor reaches 6 MPa, and add 10 g of initiator potassium persulfate to start the reaction. Continue to add vinylidene fluoride monomer to maintain the pressure, and add 2 g of potassium persulfate every half an hour until the amount of VDF monomer added reaches 15000 g, and maintain the temperature to consume residual monomer. Stop stirring after 30 min, vent to normal pressure, and collect the product after post-treatment.

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Abstract

The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a highly alkali-resistant 1,1-difluoroethylene polymer and a preparation method thereof. The preparation method of the present invention comprises the following steps: adding deionized water, dispersant, initiator, chain transfer agent, pH regulator, vinylidene fluoride monomer into a closed polymerization reactor, and controlling the polymerization pressure and Suspension polymerization is carried out after the polymerization temperature; after the polymerization is completed, the slurry is washed and dried to obtain the 1,1-difluoroethylene polymer. In the preparation method, by increasing the head-to-head and tail-to-tail links in the PVDF polymer, the continuous elimination reaction of molecules is effectively interrupted, the formation of unstable large π double bonds is reduced, and the alkali resistance of polyvinylidene fluoride is improved.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a highly alkali-resistant 1,1-difluoroethylene polymer and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF), also known as 1,1-difluoroethylene polymer, is a highly crystalline, chemically resistant engineering thermoplastic fluoropolymer, and its typical application temperature range is -35°C to 150°C . Polyvinylidene fluoride is being widely used in the process industry, covering chemical industry, petroleum, oil refining, coating, light industry, electronic communication, pharmaceutical, environmental protection, energy and other fields. In addition to high temperature, high pressure, low temperature, In addition to special working conditions such as high vacuum, it is often required to work in harsh environments with strong corrosion. In terms of molecular results, since the carbon chain of the polyole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/22C08F2/20
CPCC08F114/22C08F2/20
Inventor 唐妮王汉利王军李秀芬杜延华许克吕鹏程
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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