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High-dielectric-constant polyvinylidene fluoride (PVDF) as well as preparation method and application thereof

A technology with high dielectric constant and polyvinylidene fluoride, which is applied in the field of organic chemical materials, can solve problems such as the drop of the maximum service temperature, and achieve the effect of low crystallinity and excellent electrical properties

Active Publication Date: 2019-05-28
CHENGUANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this patent, at the beginning of polymerization, all comonomers are mixed for suspension reaction, and the obtained copolymer is a uniform and regular polymer. Although the molar content of trifluoroethylene gradually increases and the piezoelectric coefficient increases, the maximum service temperature decline

Method used

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  • High-dielectric-constant polyvinylidene fluoride (PVDF) as well as preparation method and application thereof
  • High-dielectric-constant polyvinylidene fluoride (PVDF) as well as preparation method and application thereof
  • High-dielectric-constant polyvinylidene fluoride (PVDF) as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In a 50L stainless steel vertical reaction kettle, add 32L of deionized water, blow nitrogen and oxygen three times, evacuate until the oxygen content is less than or equal to 25ppm, add 40g of sodium acetate, 80g of fluorine-containing compound emulsifier, start stirring, the speed is 360rpm, and the temperature is raised to 130 ℃, add vinylidene fluoride monomer to 3.5MPa, after the system is stable, add 40g of ethyl acetate to the reactor through a metering pump, and then add 40g of dicumyl peroxide (DCP) into the reactor after a few minutes , start the polymerization reaction. At the same time, continue to add mixed monomers to keep the pressure of the reactor at 3.5 MPa until the solid content of the emulsion in the reactor reaches 30% to stop the reaction, recover the unreacted monomers, release the polymer emulsion, and freeze the obtained polymer in -35 ° C in brine. Coagulate and thaw to fully separate the material from water, wash with 60°C deionized water unt...

Embodiment 2

[0047] In a 50L stainless steel vertical reaction kettle, add 32L of deionized water, blow nitrogen and oxygen three times, evacuate until the oxygen content is less than or equal to 25ppm, add 40g of sodium acetate, 80g of fluorine-containing compound emulsifier, start stirring, the speed is 360rpm, and the temperature is raised to 130 ℃, add 85% vinylidene fluoride and 15% trifluoroethylene mixed monomer to 3.5MPa, after the system is stable, add 40g of isopropanol to the reaction kettle through a metering pump, and add 40g of dicumyl benzene after a few minutes Peroxide (DCP) is added to the reactor to start the polymerization reaction. At the same time, continue to add mixed monomers to keep the pressure of the reactor at 3.5 MPa until the solid content of the emulsion in the reactor reaches 30% to stop the reaction, recover the unreacted monomers, release the polymer emulsion, and freeze the obtained polymer in -35 ° C in brine. Coagulate and thaw to fully separate the ma...

Embodiment 3

[0052] Repeat the steps described in Example 2, the only difference is that the mixed monomer ratio is 75% vinylidene fluoride, 15% trifluoroethylene and 10% chlorotrifluoroethylene.

[0053] The results are listed in Table 3.

[0054] table 3

[0055]

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PUM

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Abstract

The invention relates to the technical field of organic chemical materials and specifically relates to high-dielectric-constant polyvinylidene fluoride (PVDF) and a preparation method thereof. The preparation method comprises the following steps: carrying out a polymerization reaction on vinylidene fluoride, fluoroolefin or a vinylidene fluoride monomer in the presence of an initiator, a chain transfer agent and a pH (Potential of Hydrogen) regulator, wherein the fluoroolefin is one of trifluoroethylene, trifluorochloroethylene, difluorochloroethylene and tetrafluoroethylene; the initiator isorganic peroxide; and the organic peroxide is one of dicumyl peroxide, cumene hydroperoxide, di-tert-butyl peroxide, tert-butyl peroxybenzoate and tert-butyl hydroperoxide. Polyvinylidene fluoride resin prepared by the preparation method involved in the invention has the properties of low crystallization degree, highly-irregular chain segments, high beta-phase type polymers and the like; and a product of the preparation method has excellent electrical performance in electronic devices, energy storage containers and sensors.

Description

technical field [0001] The invention relates to the technical field of organic chemical materials, in particular to a high dielectric constant polyvinylidene fluoride and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) resin has the characteristics of both fluorine-containing resin and general-purpose resin, and has excellent comprehensive properties: excellent chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, ultraviolet resistance, radiation resistance, and It has special properties such as piezoelectricity and pyroelectricity, and is widely used in the three major fields of chemical equipment, electronic appliances and architectural coatings. It has become the second largest variety of fluororesins after polytetrafluoroethylene. Kawai discovered in 1969 that polyvinylidene fluoride (PVDF) of β crystal form exhibited piezoelectricity with industrial value after high electric fiel...

Claims

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Application Information

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IPC IPC(8): C08F114/22C08F214/22C08F214/18C08F214/24C08F2/38C08F4/34C08F2/30C08F2/28
Inventor 王先荣汪仲权张廷健曾波余金龙龚蓉
Owner CHENGUANG RES INST OF CHEM IND
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