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Method for preparing polyvinylidene fluoride (PVDF)-hexafluoropropylene (HFP) modification membrane of high energy density through hot pressing cross linking

A PVDF-HFP, high energy storage density technology, applied in the field of new energy storage materials, can solve the problems of poor stability and reproducibility of structure modulation, less dosage, unfavorable mass production, etc., and achieve light weight, simple method, and relatively powerful effect

Inactive Publication Date: 2013-02-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dose of one irradiation is small, and the stability and reproducibility of structure modulation are poor, which is not conducive to large-scale industrial production

Method used

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  • Method for preparing polyvinylidene fluoride (PVDF)-hexafluoropropylene (HFP) modification membrane of high energy density through hot pressing cross linking
  • Method for preparing polyvinylidene fluoride (PVDF)-hexafluoropropylene (HFP) modification membrane of high energy density through hot pressing cross linking
  • Method for preparing polyvinylidene fluoride (PVDF)-hexafluoropropylene (HFP) modification membrane of high energy density through hot pressing cross linking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Weigh 1.00g of vinylidene fluoride-hexafluoropropylene copolymer PVDF-HFP with a molecular weight of 300,000 to 400,000, and the molar ratio of vinylidene fluoride to hexafluoropropylene in the copolymer is 97.5:2.5, and dissolve 0.050g of crosslinking agent BPO In a 50ml stoppered Erlenmeyer flask containing 25ml of N,N-dimethylformamide, stir with a magnetic stirrer at room temperature until a transparent and uniform solution is poured on a tetrafluoroethylene mold , first dry in an oven at room temperature, and then continue to dry in a vacuum oven to ensure that there is no residual solvent in it, and the binary composite material of crosslinking agent BPO / PVDF-HFP can be obtained. Weigh a binary composite material with a mass of about 0.035g and place it between two gaskets. Under the conditions of temperature 200°C and pressure 5Mpa, use a powder tablet press 769YP-15A for hot pressing and crosslinking for 2 hours to ensure The cross-linking reaction with the cross...

Embodiment 2

[0035] Weigh 1.00g of vinylidene fluoride-hexafluoropropylene copolymer PVDF-HFP with a molecular weight of 300,000 to 400,000, and the molar ratio of vinylidene fluoride to hexafluoropropylene in the copolymer is 97.5:2.5, and dissolve 0.100g of crosslinking agent BPO In a 50ml stoppered Erlenmeyer flask containing 25ml of N,N-dimethylformamide, stir with a magnetic stirrer at room temperature until a transparent and uniform solution is poured on a tetrafluoroethylene mold , first dry in an oven at room temperature, and then continue to dry in a vacuum oven to ensure that there is no residual solvent in it, and the binary composite material of crosslinking agent BPO / PVDF-HFP can be obtained. Weigh a binary composite material with a mass of about 0.035g and place it between two gaskets. Under the conditions of temperature 200°C and pressure 5Mpa, use a powder tablet press 769YP-15A for hot pressing and crosslinking for 2 hours to ensure The cross-linking reaction with the cros...

Embodiment 3

[0037] Weigh 1.00 g of vinylidene fluoride-hexafluoropropylene copolymer PVDF-HFP with a molecular weight of 300,000 to 400,000 and a molar ratio of vinylidene fluoride to hexafluoropropylene in the copolymer of 97.5:2.5, and 0.150 g of crosslinking agent peroxidized Benzoyl was dissolved in a 50ml stoppered conical flask filled with 25ml of N,N-dimethylformamide, stirred with a magnetic stirrer at room temperature until it became a transparent and uniform solution, and the above solution was poured into tetrafluoroethylene On the vinyl mold, first dry it in an oven at room temperature, and then continue to dry it in a vacuum oven to ensure that there is no residual solvent in it, and you can get a binary composite material of crosslinking agent BPO / PVDF-HFP. Weigh a binary composite material with a mass of about 0.035g and place it between two gaskets. Under the conditions of temperature 200°C and pressure 5Mpa, use a powder tablet press 769YP-15A for hot pressing and crosslin...

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Abstract

The invention discloses a method for preparing a polyvinylidene fluoride (PVDF)-hexafluoropropylene (HFP) modification membrane of high energy density through hot pressing cross linking. The method comprises steps of dissolving cross linking agents benzoyl peroxide (BPO) and PVDF-HFP by using a solvent, preparing a transparent uniform solution, pouring the solution to a dispersed uniform BPO / PVDF-HFP binary composite material on the normal temperature condition, removing a residual solution through vacuum drying, placing the BPO / PVDF-HFP binary composite material in a tablet press, and on certain temperature and pressure conditions, preparing the PVDF-HFP cross linking modification membrane through the hot pressing cross linking. The method is simple in process, an expensive ultraviolet light cross linking method or an expensive electron irradiation method is not used, the energy density of the prepared cross linking modification membrane is improved and the dielectric loss is reduced.

Description

technical field [0001] The invention relates to the technical field of new energy storage materials, in particular to a method for preparing PVDF-HFP modified membranes with high energy storage density through thermal press crosslinking. Background technique [0002] With the increasing demand for dielectric materials in capacitors, information storage and sensors, the development of energy storage materials with high energy storage density and high power will help to develop energy storage materials with low cost, small size, light weight and high specific power. The new capacitive materials are used in industry. Among them, vinylidene fluoride copolymer is the best storage device for controlling and storing charge and electric energy because of its high dielectric constant, high breakdown field strength, fast charge and discharge rate, low cost and good stability. Energy materials play an important role in the application of modern electronic power systems. The electrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L27/16C08L27/20C08K5/14
Inventor 沈群东陈迎鑫程照溪刘璐陈昕
Owner NANJING UNIV
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