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Polyolefin microporous membrane as well as preparation method and application thereof

A polyolefin microporous film and polyolefin technology, applied in the field of polyolefin materials, can solve problems such as uneven cooling of the melt, affecting product uniformity, quality and application, and generation of waves, etc., to overcome uneven cooling of the melt , reduce the formation of spherulites and epiphytic crystals, and reduce the uneven effect of stretching into holes

Active Publication Date: 2013-12-25
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the cooling process of the melt close to the casting roll, the high-speed movement of the casting roll will form an air layer between the melt and the roll, and the fluctuation of the air will cause the melt to cool unevenly and produce waves, which will seriously affect the uniformity of the product. quality and application
At present, in order to avoid the above problems, researchers mainly use positive pressure air knives, negative pressure air knives and edge-holding devices to assist the melt roll, but this auxiliary method cannot completely solve the problem of the diaphragm caused by this fluctuation. Uniformity

Method used

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  • Polyolefin microporous membrane as well as preparation method and application thereof
  • Polyolefin microporous membrane as well as preparation method and application thereof
  • Polyolefin microporous membrane as well as preparation method and application thereof

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Embodiment Construction

[0029] In this application, the casting method is used to prepare polyolefin microporous membranes. In view of the problem of uneven cooling of the melt caused by air fluctuations in the casting cooling process in the prior art, this application adopts fog surface quenching during the preparation process. The rolls draw and cool the polyolefin melt into a polyolefin base film. The use of matte chilled rollers in the casting cooling process of polyolefin melts can make the air layer between the melt and the rollers formed due to the high-speed movement of the rollers during the cooling process of the polyolefin melt close to the matted chilled rollers The air brought in enters the grooves on the surface of the matte chilled roller, thereby reducing air fluctuations and effectively reducing the generation of waves. The matte chill roll suitable for this application needs to satisfy: its Ra value is 0.04-2 μm, and the diameter of the matte chill roll is 200-2000 mm. Wherein, whe...

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Abstract

The invention discloses a preparation method of a polyolefin microporous membrane, the polyolefin microporous membrane prepared by using the preparation method and an application of the polyolefin microporous membrane. According to the preparation method, a polyolefin melt can be rapidly subjected to draft cooling to form a base membrane at a speed of 10-200m / min by adopting a matte chilling roller which has the surface roughness (Ra value) of 0.04-2mu m, the diameter of 200-2000mm and the temperature of 10-100 DEG C, wherein the distance between the melt and the roller surface is 2-200mm. The melt cooling and freezing speed is accelerated by using the matte chilling roller, the influence of air in the casting and cooling process is effectively reduced and wavy patterns are reduced. The polyolefin microporous membrane prepared by adopting the preparation method has better uniformity and can be widely applied to the fields of battery diaphragms, filtering membranes, medicinal membranes or the like.

Description

technical field [0001] The present application relates to the field of polyolefin materials, in particular to a method for preparing a polyolefin microporous membrane, a polyolefin microporous membrane prepared by the method, and applications of the polyolefin microporous membrane. Background technique [0002] Polyolefin microporous membranes are widely used in battery separators, filtration membranes, medical membranes and other fields. Preparation of microporous membranes with good uniformity is a difficult point in the production process. Especially when these microporous membranes are used as battery separators, the importance of uniformity is even more prominent. On the one hand, the uniformity of the battery separator affects the consistency between each battery cell, and on the other hand, it also affects the consistency of charge and discharge between the positive and negative electrodes inside each battery. These will adversely affect the pass rate, safety and li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/02B29C35/16B29C55/00H01M2/16H01M50/403H01M50/417H01M50/491H01M50/494
CPCY02E60/10
Inventor 于长溥王哲曹志锋张羽标涂婷
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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