High fused mass strength compound isolating film and preparation method and application thereof

A technology with high melt strength and melt strength, applied in electrical components, circuits, battery pack parts, etc., can solve the problems of reduced melt strength, insufficient puncture resistance, and difficulty in stretching, and achieve good melt strength. , Superior performance, convenient stretching effect

Inactive Publication Date: 2008-07-16
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method, the microporous membranes currently produced industrially are basically HDPE single-layer isolation membranes, which have disadvantages such as insufficient safety and insufficient puncture resistance.
[0006] If the multilayer microporous membrane is produced by thermally induced phase separation, if PE and PP layers are directly compounded, on the one

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1:

[0041] 30% (weight) of high-density polyethylene (weight average molecular weight 2.7×10 5 , Melting point 133℃) is put into twin-screw extruder A (diameter 78mm, L / D=50, strong mixing type), and 70% (weight) liquid paraffin (kinematic viscosity) is added through the lateral feeding port with a metering pump 90cst / 40°C), melt-kneaded at 200°C and 150 rpm to prepare solution A; 30% (weight) of ethylene-propylene block copolymer (crystallinity 85%, melting point> 170°C, Ethylene content 7%) is put into twin-screw extruder B (diameter 78mm, L / D=50, strong mixing type), and 70% (weight) liquid paraffin (kinematic viscosity) is added through the lateral feeding port with a metering pump 90cst / 40℃), melted and kneaded at 230℃ and 150 rpm to prepare solution B; then solution A and solution B were mixed in a T-die for B / A two-layer co-extrusion, B / The thickness ratio of the two layers of A is 1:1, and the cast sheet is cooled on the sheet casting roll to obtain a thic...

Example Embodiment

[0042] Example 2:

[0043] 30% (weight) of high-density polyethylene (weight average molecular weight 2.7×10 5 , Melting point 133℃) is put into twin-screw extruder A (diameter 78mm, L / D=50, strong mixing type), and 70% (weight) liquid paraffin (kinematic viscosity) is added through the lateral feeding port with a metering pump 90cst / 40°C), melt-kneaded at 200°C and 150 rpm to prepare solution A; 30% (weight) of ethylene-propylene block copolymer (crystallinity 85%, melting point> 170°C, Ethylene content 7%) is put into twin-screw extruder B (diameter 78mm, L / D=50, strong mixing type), and 70% (weight) liquid paraffin (kinematic viscosity) is added through the lateral feeding port with a metering pump 90cst / 40°C), melt and knead at 230°C and 150 rpm to prepare solution B; then mix solution A and solution B in a T-die for B / A / B three-layer co-extrusion, The thickness ratio of the three layers of B / A / B is 3:4:3, and the cast sheet is cooled on the sheet casting roll to obtain a thic...

Example Embodiment

[0044] Example 3:

[0045] 30% (weight) of high-density polyethylene (weight average molecular weight 2.7×10 5 , Melting point 133℃) is put into twin-screw extruder A (diameter 78mm, L / D=50, strong mixing type), and 70% (weight) liquid paraffin (kinematic viscosity) is added through the lateral feeding port with a metering pump 90cst / 40℃), melted and kneaded at 200℃, 150 rpm to prepare solution A; 30% (weight) of propylene-1-butene block copolymer (crystallinity 80%, melting point> 170℃, butene content 7%) was put into twin-screw extruder B (diameter 78mm, L / D=50, strong mixing type), and 70% (weight) of liquid was added through the lateral feeding port with a metering pump Paraffin wax (kinematic viscosity 90cst / 40℃), melted and kneaded at 230℃ and 150 rpm to prepare solution B; then solution A and solution B were mixed in a T-die for two layers of B / A Extrusion, the thickness ratio of the two layers of B / A is 2:1, and the cast sheet is cooled on the sheet casting roll to obtain ...

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PUM

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Abstract

The invention relates to a battery polyolefin isolating membrane. The composite isolating film with high fused mass strength of the invention is a microporous membrane which takes the structure of B/A two-layer or B/A/B three-layer, wherein, A layer is a copolymer membrane of polyethylene or ethylene and 5 to 50 percent other olefins or a mixture membrane of the polyethylene or the ethylene and the 5 to 50 percent other olefins, and B layer is a copolymer membrane of propylene and 0.1 to 10 percent other olefins. The invention has the advantages that: a polymer A which provides low obturator temperature and a polymer B which provides high membrane rupture temperature and high fused mass strength are led in a formulation for preparation of the polyolefin composite microporous isolating membrane, thereby the isolating membrane with low obturator temperature, high membrane rupture temperature, high fused mass strength and high use safety is obtained.

Description

technical field [0001] The invention relates to a polyolefin isolation film for a lithium ion battery, in particular to a multi-layer composite polyolefin microporous isolation film with high melt strength. Background technique [0002] Polyolefin microporous film is a plastic film with numerous interconnected micropores with a pore size of 0.01-10 μm. Used as a separator in lithium batteries. Lithium-ion batteries consist of positive and negative electrodes, a separator, and an electrolyte. Among them, the separator connects and separates the positive electrode and negative electrode materials. It is an insulator of electrons, but it allows ions to pass through. The performance of the separator determines the interface structure and internal resistance of the battery, which in turn affects the capacity, cycle, charge and discharge of the battery. Therefore, the performance of the separator plays an important role in improving the overall performance of the battery. [00...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14C08J5/22C08J5/18H01M50/403H01M50/417H01M50/457
CPCY02E60/10
Inventor 雷彩红植志飞
Owner SHENZHEN SENIOR TECH MATERIAL
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