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Roll of polyolefin microporous film and production method thereof

A technology made of microporous membranes and polyolefins, which is applied in secondary battery manufacturing, structural parts, battery pack parts, etc., can solve the problem of insufficient precision of the outer diameter of the winding, and achieve high-efficiency manufacturing and accurate management Effect

Active Publication Date: 2009-07-29
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the outer diameter accuracy of the above-mentioned wound product is not sufficient

Method used

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  • Roll of polyolefin microporous film and production method thereof
  • Roll of polyolefin microporous film and production method thereof
  • Roll of polyolefin microporous film and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] Fabrication of Polyolefin Microporous Membrane

[0124] A mixture of 35% by weight of Mv 270,000 polyethylene and 65% by weight of Mv 950,000 polyethylene was dry-mixed using a tumble mixer to obtain a polyolefin composition. 30% by weight of the obtained composition and 70% by weight of liquid paraffin were uniformly melt-kneaded using a twin-screw extruder to obtain a polyethylene melt-kneaded product. Melting and kneading were carried out under the conditions of a set temperature of 200° C., a propeller rotation speed of 170 rpm, and a discharge rate of 15 kg / hr. Next, the molten kneader was extruded into a sheet form using a T-die (250 mm in width) maintaining the molten kneader at 220°C.

[0125] The molten kneaded material was compacted and cooled with a metal roller whose surface temperature was controlled to 60° C., thereby obtaining a gel sheet with a thickness of 1000 μm and excellent thickness stability.

[0126] Next, using a simultaneous biaxial stretch...

Embodiment 2

[0141] Fabrication of Polyolefin Microporous Membrane

[0142] A mixture of 35% by weight of Mv 270,000 polyethylene and 65% by weight of Mv 950,000 polyethylene was dry-mixed using a tumble mixer to obtain a polyolefin composition. 30% by weight of the obtained composition and 70% by weight of liquid paraffin were uniformly melt-kneaded using a twin-screw extruder to obtain a polyolefin melt-kneaded product. Melting and kneading were carried out under the conditions of a set temperature of 200° C., a propeller rotation speed of 170 rpm, and a discharge rate of 15 kg / hr. Next, the molten kneader was extruded into a sheet form using a T-die (250 mm in width) maintaining the molten kneader at 220°C.

[0143] The molten kneaded material was compacted and cooled with a metal roller whose surface temperature was controlled to 60° C., thereby obtaining a gel sheet having a thickness of 1100 μm and excellent thickness stability.

[0144] Next, using a simultaneous biaxial stretch...

Embodiment 3

[0158] In 12.8% by weight of Mv270,000 polyethylene, 19.2% by weight of Mv950,000 ultra-high molecular weight polyethylene, 48% by weight of dioctyl phthalate (DOP), 20% by weight of silicon powder (finely divided silica ) was mixed and granulated, then extruded after being melted and kneaded by a twin-screw extruder equipped with a T-die at the front end, and rolled from both sides with heated rollers to form a sheet with a thickness of 110 μm. DOP and silicon powder are extracted and removed from the molded product to form a microporous membrane. Two sheets of this microporous film were stacked, stretched 4.5 times in the longitudinal direction at 110°C, stretched 1.7 times in the transverse direction at 133°C, and finally heat-treated at 135°C. A microporous membrane with a lateral width of 1.2 m, a membrane thickness of 18 μm, a porosity of 50%, and a pore diameter of 0.1 μm was obtained. In addition, the dynamic friction coefficient in the TD direction of the microporous...

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Abstract

The invention provides a roll of polyolefin microporous film and its production method. The roll of polyolefin microporous film consists of a roll having a polyolefin microporous film rolled up around a roll core, characterized in that the absolute value ([mu]m) of difference (film thickness difference) between the film thickness (T, [mu]m) calculated according to the formula (1) and the film thickness (t, [mu]m) evaluated for one sheet is 1.5 [mu]m or less. Further, there is provided a process for producing the same. T([mu]m) = p(D-d) / 4L, wherein D is the outer diameter (mm) of roll resulting from rolling up around the roll core including the porous film; d is the outer diameter (mm) of roll core; and L is the rolling length (m) of the roll.

Description

technical field [0001] The present invention relates to a polyolefin microporous film roll used for a battery separator, that is, a roll in which a microporous film made of polyolefin or a polyolefin-containing resin composition is wound around a core Around things. In particular, it relates to a polyolefin microporous membrane roll suitably used as a separator for a lithium ion secondary battery and a method for producing the same. Background technique [0002] Polyolefin microporous membranes are used as separators for various batteries. In particular, polyolefin resins have excellent resistance to organic solvents and are also excellent in electronic insulation properties, and therefore are widely used in lithium ion secondary batteries. [0003] In recent years, along with the multifunctionalization, weight reduction, and cost reduction of mobile phones, personal computers, and other portable devices, which are the main applications of lithium-ion secondary batteries, ...

Claims

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Application Information

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IPC IPC(8): C08J9/28H01M2/16H01M50/406H01M50/417H01M50/489H01M50/491H01M50/494
CPCY02E60/12H01M10/0587H01M10/0409H01M10/0525H01M2/1653H01M2/145Y02E60/10H01M50/417H01M50/406H01M50/491H01M50/489H01M50/494C08J9/28C08J9/22C08L23/00
Inventor 西村佳史高桥晃新原靖
Owner ASAHI KASEI KK
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