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Production method of thermoplastic resin microporous membrane

A technology of thermoplastic resin and microporous membrane, which is applied in the field of manufacturing thermoplastic resin microporous membrane

Inactive Publication Date: 2009-01-21
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, there is a problem that marks (suction marks) due to the suction grooves or holes of the roll are formed on the microporous membrane.

Method used

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  • Production method of thermoplastic resin microporous membrane
  • Production method of thermoplastic resin microporous membrane
  • Production method of thermoplastic resin microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] At a weight average molecular weight of 2.0×10 by 25% by mass 6 The ultra-high molecular weight polyethylene (UHMWPE) and 75% by mass have a weight average molecular weight of 3.5×10 5 In polyethylene (melting point 135°C, crystallization dispersion temperature 90°C) composed of high-density polyethylene (HDPE) with Mw / Mn=16, 0.375 mass parts of tetrachloride as an antioxidant is added to every 100 mass parts of the composition. [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane to give a polyethylene composition. 25 parts by mass of the obtained polyethylene composition was charged into a twin-screw extruder (inner diameter 58 mm, L / D=42, strong mixing type), and 75 parts by mass of The liquid paraffin was melt-kneaded under the conditions of 200° C. and 200 rpm, and a polyethylene solution was prepared in an extruder. Next, the polyethylene solution was extruded from a die provided at the front end of the extruder so as to have a thickness of about 4...

Embodiment 2

[0179] In the same manner as in Example 1, the biaxially stretched film produced was fixed on the frame plate, and immersed in methylene chloride [surface tension: 27.3mN / m (25°C), boiling point: 40.0°C, temperature adjusted to 23°C, Solubility in water: 20000 ppm (mass basis) (20° C.)], washing while shaking at 100 rpm for 30 seconds in the first washing tank. While replacing the dichloromethane with a new solution as appropriate, the above-mentioned series of cleaning operations were repeated twice. Next, the film was fixed on the frame plate, and immersed in methyl perfluorobutyl ether [compositional formula: C 4 f 9 OCH 3 , Trade name: Nobetsuku HFE-7100, manufactured by Sumitomo 3M Co., Ltd., surface tension: 13.6mN / m (25°C), boiling point: 61°C, solubility in water: 12ppm (mass basis) (25°C), no flash point] in the second cleaning tank (rinsing tank), the rinsing process was performed while shaking at 100 rpm for 20 seconds. Replace the methyl perfluorobutyl ether wi...

Embodiment 3

[0181] In addition to the first cleaning tank with n-decane [surface tension: 23.4mN / m (25°C), boiling point: 173°C, solubility in water: 50ppm (mass basis) (20°C)] adjusted to 60°C In the same manner as in Example 2, except that the temperature of warm water was set to 80° C., a polyethylene microporous membrane was produced (the number of times of washing: three times in total). The time required to remove the cleaning solvent was 2 seconds.

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Abstract

A method for producing a micro-porous film of a thermoplastic resin, wherein a thermoplastic resin and a solvent for forming a film are together molten and kneaded to form a solution, the solution is extruded from a die and then cooled to prepare a gelated product, the residue of the above solvent for film forming is removed from the gelated product by using a solvent for cleaning, and the solvent for cleaning is removed, which comprises using, as the solvent for cleaning, a solvent having (a) a surface tension at 25 DEG C of 24 mN / m or less, (b) a boiling point under atmospheric pressure of 100 DEG C or lower, and (c) a solubility into water at 16 DEG C of 600 ppm (on mass basis) or less, and further comprises removing the residue of the above solvent for cleaning from the product after the above cleaning by the use of warm water.

Description

technical field [0001] The present invention relates to a method for producing a thermoplastic resin microporous membrane, and more particularly, to a method for producing a thermoplastic resin microporous membrane while suppressing volatilization of a cleaning solvent for removing a film-forming solvent and film shrinkage. Background technique [0002] Thermoplastic resin microporous membranes are widely used in various applications such as battery separators, electrolytic capacitor diaphragms, various filters, moisture-permeable waterproof clothing, reverse osmosis filtration membranes, ultrafiltration membranes, and precision filtration membranes. [0003] When a thermoplastic resin microporous film is produced by a wet method, a solvent or a plasticizer is used, but it must be removed from the gel-like molded product after film formation so as not to remain in the final product. In order to remove the solvent (film-forming solvent) or plasticizer added during film format...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/26
Inventor 铃木贞胜君岛康太郎滝田耕太郎
Owner TORAY IND INC
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