Preparation method for diaphragm with low friction coefficient

A technology with a small friction coefficient and a diaphragm, which is applied in the direction of electrical components, electrochemical generators, circuits, etc., can solve the problems of reducing melt fluidity, rough diaphragm surface, unfavorable polymer processing and molding, etc. The effect of neat, convenient production and processing

Inactive Publication Date: 2014-11-19
SHENZHEN SENIOR TECH MATERIAL
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Problems solved by technology

[0004] In the process of making the diaphragm, the raw material (mainly polyolefin) usually has a relatively high viscosity after melting. During the processing, the polymer melt with high viscosity flows through the flow channel, die head, etc. The mechanical surface produces greater friction, and some friction is very unfavorable to the processing and molding of polymers. These frictions reduce the fluidity of the melt and make the surface of the diaphragm after processing rough.

Method used

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  • Preparation method for diaphragm with low friction coefficient
  • Preparation method for diaphragm with low friction coefficient
  • Preparation method for diaphragm with low friction coefficient

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preparation example Construction

[0026] A method for preparing a diaphragm with a small coefficient of friction, comprising the steps of:

[0027] (1) Stir the polyolefin resin, lubricant and other additives evenly through a mixing mixer to obtain a mixture;

[0028] (2) adding the mixture to a cast extrusion device for casting to prepare a cast base film;

[0029] (3) Putting the prepared casting base film into a constant temperature oven for heat treatment;

[0030] (4) After the heat treatment is completed, the heat-treated base film is stretched longitudinally to prepare a microporous separator with a microporous structure and qualified performance.

[0031] In the present invention, the lubricant can be selected from one or more of polyolefin commonly used lubricants such as calcium stearate, ethylene bisstearamide, stearamide, high boiling point paraffin wax, microcrystalline paraffin wax, PP wax, PE wax, etc. A lubricating additive.

[0032] Among them, the significance of adding lubricant is: (1) t...

Embodiment

[0051] A diaphragm is prepared by using the method of the present invention. One or more lubricants with lubricating effect are added before the diaphragm is formed. The diaphragm is made of polypropylene (PP) with a thickness of 16 μm, and its performance is qualified in all aspects.

[0052] Cut out 5 groups of diaphragm samples with a size of 120 mm in width and 150 mm in length along the MD and TD directions of the diaphragm respectively, gently clamp the diaphragm samples to the sample holding block, and fix the stainless steel sheet on the sliding platform. After the above actions are completed Gently place the sample holding block on the stainless steel sheet to contact it, and connect the sample holding block to the spring pin seat with the tension sensor with a steel wire rope. Among them, the mass of the sample holding block is selected as 200g, the test speed is 100mm / min, and the number of tests is 5 times. After setting the experimental parameters, the test can st...

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Abstract

The invention discloses a preparation method for a diaphragm with a low friction coefficient. The preparation method comprises the following steps: (1) stirring polyolefin resin, a lubricant and other additives uniformly through a stirring mixing machine to obtain a compound; (2) adding the compound into a curtain coating extrusion device for piece casting to prepare a curtain coating basic diaphragm; (3) putting the prepared curtain coating basic diaphragm in a constant temperature oven for heat treatment; (4) stretching the heat treatment basic diaphragm in the longitudinal direction after the heat treatment is completed to prepare a micropore diaphragm which adopts a micropore structure and is qualified in performance. The preparation method has the advantages that the processed diaphragm can be easily unplugged from a reeling pin after core reeling is conducted, and the phenomenon that reeling core end surfaces are irregular is reduced.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, in particular to a diaphragm with a small friction coefficient obtained by adding a lubricant before polymer processing and molding, and through the processes of raw material mixing, melting, cast casting, heat treatment and stretching Methods. Background technique [0002] With the rapid development of electrical appliances, people have more and more stringent requirements for the performance of lithium batteries that provide power, especially for the safety performance of lithium batteries. Among them, during the winding process of the lithium battery, it was found that due to the high friction between the diaphragm and the winding needle, it is often difficult to pull the winding core from the winding needle, and the diaphragm is easy to appear on the winding core after being pulled out. Tear, uneven winding core end face, winding core spiral, etc. These problems seriously affect the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 杨亚男陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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