Polyolefin microporous film and substrate for coating using polyolefin microporous film

A technology of microporous membranes and polyolefins, applied in the direction of coating, etc., can solve the problems of unclear substrate properties, unrecorded uneven coating, unrecorded uniform coating methods, etc., to achieve excellent characteristics, high-speed transportation, The effect of good permeability and withstand voltage characteristics

Active Publication Date: 2020-04-14
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of uniform coating is not described
[0008] Regardless of the literature, in order to achieve good transportability, permeability, and withstand voltage characteristics, the stretching method or coating material has been adjusted to suppress the decline in physical properties after coating, but there is no description of the suppression of coating. method of uneven coating
In addition, in the past, in order to perform uniform coating, adjustments or coating methods for various coating materials have been adopted, but they are all only considered from the perspective of coating materials. In order to perform uniform coating, the base material The required performance is not clear
In order to perform high-speed conveyance and uniform coating, there is a limit to only adjusting the coating material or coating method

Method used

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  • Polyolefin microporous film and substrate for coating using polyolefin microporous film
  • Polyolefin microporous film and substrate for coating using polyolefin microporous film
  • Polyolefin microporous film and substrate for coating using polyolefin microporous film

Examples

Experimental program
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Effect test

Embodiment 1

[0167] Prepare a weight average molecular weight (Mw) of 2.89×10 6 30% by weight of ultra-high molecular weight polyethylene (UHMWPE (PE1)) with a molecular weight distribution Mw / Mn of 5.28 and a weight-average molecular weight Mw of 5.72×10 5 , A polyethylene composition comprising 70% by weight of high-density polyethylene (HDPE (PE2)) having a molecular weight distribution Mw / Mn of 4.81. When the polyethylene composition as a whole was 100% by weight, the content of the polyethylene component with a molecular weight of 500,000 or less was 59% by weight, and the content of the polyethylene component with a molecular weight of 1,000,000 or more was 26% by weight. 71.5% by weight of liquid paraffin was added to 28.5% by weight of the polyethylene composition, and then, based on the mass of polyethylene in the mixture, 0.5% by mass of 2,6-di-tert-butyl-p-cresol and 0.7% by mass were added. Tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate]methane was used as a...

Embodiment 2

[0169] A polyolefin microporous membrane was produced in the same manner as in Example 1 except that the stretching temperature of MD stretching and simultaneous biaxial stretching was 110°C. Table 1 shows the membrane properties of the obtained polyolefin microporous membrane.

Embodiment 3

[0171] A polyolefin microporous membrane was produced in the same manner as in Example 1 except that the draw ratio in the MD stretching step was 1.8 times. Table 1 shows the membrane properties of the obtained polyolefin microporous membrane.

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PUM

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Abstract

The present invention provides a microporous film that can be preferably used as a coating substrate that is highly demanded in the fields of battery separators, capacitor films, filters, and the like, and that can be uniformly coated. A polyolefin microporous membrane, characterized in that the relative value of the average value of the peak pore diameter in the TD direction relative to the standard deviation of the expected value of the pore diameter in the TD direction is less than 24%. With regard to such a polyolefin microporous membrane, since it has a narrow pore size distribution in the TD direction and a dense pore size, it can greatly suppress the coating unevenness and coating wrinkles of the coating material, so it can be preferably used as a substrate for coating. material.

Description

technical field [0001] The present invention relates to a polyolefin microporous membrane and a substrate for coating produced using the same. Background technique [0002] Conventionally, microporous membranes have generally been used in applications such as separators for batteries, thin films for capacitors, and filters. Among them, various characteristics such as heat resistance, strength, and electrolyte solution retention are required in the use of separators for batteries. As a method of realizing such required characteristics, a method of using a microporous membrane coated with a membrane is becoming mainstream. [0003] Lithium-ion batteries are not only expected to be used in small mobile devices such as mobile phones and notebook computers, but also to expand their use in automotive applications in the future, and improvement in productivity is required. From the viewpoint of productivity, in order to carry out high-speed transportation, the strength in the mac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J9/36
CPCC08J5/18C08J2323/02
Inventor 豊田直树菅田正美石原毅
Owner TORAY IND INC
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