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PVDF-BP microporous polymer diaphragm and preparation method

A PVDF-BP, microporous polymer technology, used in electrical components, circuits, battery pack parts and other directions, can solve the problems of poor interface compatibility, poor electrochemical resistance, low ion migration number, etc., to achieve production High efficiency, good high temperature resistance, good air permeability

Inactive Publication Date: 2018-03-30
ZHEJIANG GREEN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the porous polymer system has attracted widespread attention. In 1994, the US Bellcore company used polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) to prepare a microporous polymer membrane through a plasticization / extraction process, increasing However, the PVDF-HFP-based polymer separator has the disadvantages of low ion transfer number, poor thermal stability, poor gas permeability, poor electrochemical resistance and poor interfacial compatibility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A PVDF-BP microporous polymer diaphragm, comprising 35 parts of PVDF polyvinylidene fluoride and 50 parts of BP benzophenone in parts by weight.

[0025] A method for preparing a PVDF-BP microporous polymer membrane, the specific steps are as follows:

[0026] Step 1: stirring: by weight, weigh 35 parts of PVDF polyvinylidene fluoride and 50 parts of BP benzophenone and mix and stir to obtain a mixture;

[0027] Step 2: Dissolving extrusion: inject the mixture into the twin-screw extruder through the melt pump, and extrude the substrate after dissolving;

[0028] Step 3: Cooling and forming: cooling and forming the extruded substrate at a temperature of 10-100°C;

[0029] Step 4: Stretching: Dry the cooled substrate and enter the stretching machine. The substrate is stretched several times in the stretching machine to form a film. The stretching is horizontal and vertical stretching. The stretching temperature is 100- 140°C;

[0030] Step 5: Extraction: pass the film...

Embodiment 2

[0043] A PVDF-BP microporous polymer diaphragm, in parts by weight, the PVDF-BP microporous polymer diaphragm comprises 35 parts of PVDF polyvinylidene fluoride, 50 parts of BP benzophenone, 1 part of auxiliary agent, and the auxiliary agent is One or more of tougheners, antioxidants, heat stabilizers, and antistatic agents.

[0044] A method for preparing a PVDF-BP microporous polymer membrane, the specific steps are as follows:

[0045] Step 1: stirring: by weight, weigh 35 parts of PVDF polyvinylidene fluoride, 50 parts of BP benzophenone, and 1 part of auxiliary agent, mix and stir to obtain a mixture;

[0046] Step 2: Dissolving extrusion: inject the mixture into the twin-screw extruder through the melt pump, and extrude the substrate after dissolving;

[0047] Step 3: Cooling and forming: cooling and forming the extruded substrate at a temperature of 10-100°C;

[0048] Step 4: Stretching: Dry the cooled substrate and enter the stretching machine. The substrate is stret...

Embodiment 3

[0062]A PVDF-BP microporous polymer diaphragm, in parts by weight, the PVDF-BP microporous polymer diaphragm comprises 50 parts of PVDF polyvinylidene fluoride, 65 parts of BP benzophenone, 5 parts of auxiliary agent, and the auxiliary agent is One or more of tougheners, antioxidants, heat stabilizers, and antistatic agents.

[0063] A method for preparing a PVDF-BP microporous polymer membrane, the specific steps are as follows:

[0064] Step 1: stirring: by weight, weigh 50 parts of PVDF polyvinylidene fluoride, 65 parts of BP benzophenone, and 5 parts of additives and mix and stir to obtain a mixture;

[0065] Step 2: Dissolving extrusion: inject the mixture into the twin-screw extruder through the melt pump, and extrude the substrate after dissolving;

[0066] Step 3: Cooling and forming: cooling and forming the extruded substrate at a temperature of 10-100°C;

[0067] Step 4: Stretching: Dry the cooled substrate and enter the stretching machine. The substrate is stretch...

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Abstract

The invention discloses a PVDF-BP microporous polymer diaphragm and a preparation method. The PVDF-BP microporous polymer diaphragm comprises the following components in parts by weight: 35-50 parts of PVDF polyvinylidene fluoride, 50-65 parts of BP benzophenone and 0-5 parts of auxiliaries. The preparation method for the PVDF-BP microporous polymer diaphragm comprises the specific following stepsof 1, stirring; 2, dissolving and extruding; 3, cooling and forming; 4, stretching; 5, extracting; 6, shaping; 7, rolling, and 8, storing. The PVDF-BP microporous polymer diaphragm disclosed in the invention has the advantages of high puncture strength, high high-temperature resistance, uniform pore diameter distribution, high air permeability, excellent electrochemical resistance, and high electrolyte absorptivity; and the preparation method is simple in method, green and environment friendly, and high in production efficiency.

Description

technical field [0001] The invention relates to a PVDF-BP microporous polymer diaphragm and a preparation method. Background technique [0002] As a key component of the battery, the separator will directly affect the capacity, cycle performance and safety performance of the battery. In recent years, the porous polymer system has attracted widespread attention. In 1994, the US Bellcore company used polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) to prepare a microporous polymer membrane through a plasticization / extraction process, increasing However, PVDF-HFP-based polymer separators have disadvantages such as low ion transfer number, poor thermal stability, poor gas permeability, poor electrochemical resistance, and poor interfacial compatibility. Contents of the invention [0003] The purpose of the invention is to overcome the deficiencies in the existing products, and provide a PVDF-BP microporous polymer membrane and a preparation method. [0004] In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/411
CPCH01M50/403H01M50/411Y02E60/10
Inventor 吾良福胡琴陈超许锡均赵俊华徐诚
Owner ZHEJIANG GREEN NEW MATERIALS
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