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Pressureproof three-layer composite structured polypropylene microporous membrane

A polypropylene microporous film, three-layer structure technology, applied in the field of materials, can solve problems such as poor performance and poor battery production performance

Inactive Publication Date: 2016-12-14
昆明云天化纽米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] If the liquid absorption performance of the electrolyte is poor, the productivity when manufacturing batteries will be poor

Method used

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  • Pressureproof three-layer composite structured polypropylene microporous membrane
  • Pressureproof three-layer composite structured polypropylene microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Add 0.5% by weight of N,N'-dicyclohexyl terephthalamide, 1% by weight of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester And 98.5% by weight of homopolypropylene mixing extruded granulation, obtain type I β crystal homopolypropylene, its β crystal content is 82%, melt index is 3.0g / 10min, crystallinity is 63%, fusing point is 165°C.

[0026] 2) 0.5% by weight of calcium pimelate, 1% by weight of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 98.5% by weight of homopolypropylene Mixing extrusion granulation to obtain type II β-crystal homopolypropylene with a β-crystal content of 80%, a melt index of 3.2g / 10min, a crystallinity of 60%, and a melting point of 165°C.

[0027]3) Use the above-mentioned type I β-crystal homopolypropylene as the raw material for the surface layer A and surface layer C, and use the above-mentioned type II β-crystal homopolypropylene as the raw material for the core l...

Embodiment 2

[0031] 1) Add 1.5% by weight of N,N'-dicyclohexyl naphthalene dicarboxamide, 1.5% by weight of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 97% by weight of homopolypropylene was mixed, extruded and granulated to obtain β-crystal homopolypropylene ①. The measured β-crystal content was 90%, the melt index was 5g / 10min, the degree of crystallinity was 68%, and the melting point was 166 ℃. 1.5% by weight of phthalimide, 1.5% by weight of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 97% by weight of homopolypropylene Mixing, extrusion and granulation yielded β-crystal homopolypropylene②, with a β-crystal content of 88%, a melt index of 4.5g / 10min, a crystallinity of 66%, and a melting point of 165°C.

[0032] 2) 1.5% by weight of suberic acid, 2% by weight of calcium carbonate, 1.5% by weight of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 95% The weight of ...

Embodiment 3

[0037] 1) 1.5% by weight of phthalimide, 1% by weight of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 97.5% by weight of homopolymer Polypropylene was mixed and extruded to obtain β-crystal homopolypropylene I. The measured β-crystal content was 82%, the melt index was 5g / 10min, the degree of crystallinity was 62%, and the melting point was 165°C. 2% by weight of WBG-II, 1% by weight of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester and 97% by weight of homopolypropylene are mixed and extruded Pelletizing to obtain β-crystal homopolypropylene II, the measured β-crystal content is 85%, the melt index is 4.8g / 10min, the degree of crystallinity is 63%, and the melting point is 163°C.

[0038] 2) Suberic acid of 2% by weight, calcium carbonate of 2% by weight, tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester of 1.5% by weight and 95% The weight of homopolypropylene was mix...

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Abstract

The invention discloses a pressureproof three-layer composite structured polypropylene microporous membrane, and belongs to the material field. The three-layer composite structured polypropylene microporous membrane adopts an A / B / C three-layer structure; the A / B / C three-layer structure comprises the raw materials as follows: the raw materials of the surface layer A and the surface layer C are homo-polypropylene added with an i type beta nucleating agent and an antioxidant; the raw material of the core layer B is homo-polypropylene added with an ii type beta nucleating agent and an antioxidant, wherein the content of beta crystals in the added i type beta nucleating agent is 80% or more; and the content of the beta crystals in the added ii type beta nucleating agent is 80% or more. The three-layer composite structured polypropylene microporous membrane has the characteristics of high porosity, high permeability, high mechanical strength, high liquid absorption, high liquid retention, low air permeability change in pressuring, and excellent deformability.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a pressure-resistant three-layer composite structure polypropylene microporous membrane. Background technique [0002] In the lithium-ion battery structure, the diaphragm is one of the key inner components, which separates the positive and negative electrodes of the battery, prevents the battery from short-circuiting, and also has the function of allowing electrolyte ions to pass through. In the case of using a polyolefin microporous film as a separator for a lithium battery, its performance and microstructure greatly affect the characteristics, productivity, and safety of the battery. Therefore, it is required to have excellent air permeability, mechanical properties, thermal shrinkage properties, micropore closure properties, high temperature overall stability, etc. [0003] In the known technology, there are mainly two production methods for preparing polypropylene microporous membra...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/40H01M50/409H01M50/411H01M50/449Y02E60/10
Inventor 丁大欢马骁谢新春
Owner 昆明云天化纽米科技有限公司
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