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Fiber using olefin resin, nonwoven fabric using same, and separator for alkali storage battery

A polyolefin-based resin and non-woven fabric technology, which is applied in the direction of alkaline storage battery, alkaline storage battery manufacturing, battery pack parts, etc., can solve the problems of troublesome process management and complicated process, and achieve the effect of inhibiting self-discharge

Inactive Publication Date: 2015-04-15
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, sulfonation treatment, dilution treatment, primary washing treatment, neutralization treatment, secondary washing treatment, drying treatment, waste acid treatment are required, the process is complicated, and process management has become a troublesome trouble

Method used

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  • Fiber using olefin resin, nonwoven fabric using same, and separator for alkali storage battery
  • Fiber using olefin resin, nonwoven fabric using same, and separator for alkali storage battery
  • Fiber using olefin resin, nonwoven fabric using same, and separator for alkali storage battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] Crystalline polypropylene as a crystalline polyolefin, low-crystallinity polypropylene (crystallinity: 10%) as a low-crystalline polyolefin, and maleic anhydride crystals were mixed at a mass ratio of 82.5:1.0:16.5. A mixture of maleic anhydride-modified polypropylene (maleic anhydride content: 21.0% by mass) (maleic anhydride content: 3.5% by mass) of a permanent polyolefin was spun and stretched at a temperature of 230°C by a spunbond method. Stretching, thinning, and then thermally bonding fibers through a heating calender to obtain fibers with a diameter of 8 μm, a thickness of 123 μm, and a weight per unit area of ​​50 g / m 2 non-woven partitions.

[0122] Performance was measured using this nonwoven fabric separator. As a result, the ammonia trapping capacity was 0.51 mmol / g, and the liquid absorption was 3 mm / 10 min. The ammonia trapping capacity was good. The capacity retention rate of the sealed nickel-metal hydride battery using this nonwoven fabric separator ...

Embodiment 2

[0124] Crystalline polypropylene as a crystalline polyolefin, low-crystalline polypropylene (crystallinity: 30%) as a low-crystalline polyolefin, and maleic anhydride crystals were mixed in a mass ratio of 1.0:9.0:90.0. A mixture of maleic anhydride-modified polypropylene (maleic anhydride content: 38.5% by mass) (maleic anhydride content: 34.7% by mass) of a permanent polyolefin was spun and stretched at a temperature of 230°C by a melt blown method. Stretching, thinning, and then thermally bonding fibers through a heating calender to obtain fibers with a diameter of 3 μm, a thickness of 126 μm, and a weight per unit area of ​​53 g / m 2 non-woven partitions.

[0125] The characteristics were measured using this non-woven fabric separator. As a result, the ammonia trapping capacity was 5.60 mmol / g, and the liquid absorption was 9 mm / 10 min. The ammonia trapping capacity was good. The capacity retention rate of the sealed nickel-metal hydride battery using this nonwoven fabric ...

Embodiment 3

[0127] Crystalline polypropylene as a crystalline polyolefin, low-crystallinity polybutene 1 (crystallinity: 40%) as a low-crystallinity polyolefin, and malay A mixture (content of maleic anhydride: 19.3% by mass) of maleic anhydride-modified polypropylene (content of maleic anhydride: 38.5% by mass) of acid anhydride crystalline polyolefin was spun at 240°C by a spunbond method , Stretching, sheeting, and then thermally bond the fibers through a heating calender to obtain fibers with a diameter of 10 μm, a thickness of 131 μm, and a weight per unit area of ​​55 g / m 2 non-woven partitions.

[0128] The characteristics were measured using this nonwoven fabric separator. As a result, the ammonia trapping capacity was 3.10 mmol / g, and the liquid absorption was 6 mm / 10 min. The ammonia trapping capacity was good. The capacity retention rate of the sealed nickel-metal hydride battery using this nonwoven fabric separator was 84%.

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Abstract

There is provided a low-cost alkaline storage battery separator capable of implementing stable fiber spinning and excellent ammonia trapping function so as to control self-discharge. Spinning fiber using resin including 1.0 mass % or greater of low crystalline polyolefin, crystalline polyolefin and maleic anhydride-modified polyolefin corresponding to a maleic anhydride component content of 3.5 to 35 mass % in the fiber assures stability during fiber spinning. Moreover, making a nonwoven fabric using the fiber act as a separator allows a high level of ammonia trapping function and controls self-discharge of the alkaline storage battery.

Description

technical field [0001] The present invention relates to polyolefin-based resins, fibers using the resins, nonwoven fabrics using the resins or fibers, and alkaline storage battery separators and alkaline storage batteries using the nonwoven fabrics. Background technique [0002] Alkaline batteries such as NiMH batteries are widely used as replacements for digital cameras, portable music players, hybrid cars, notebook computers or disposable batteries. As a nickel-metal hydride storage battery, it has the following advantages: it can be repeatedly used after charging and discharging about 1000 times; the volume energy density is about 300Wh / L and its capacity is higher than that of nickel-cadmium storage battery; since it does not contain cadmium, the environmental load is lower than that of nickel-cadmium storage battery; and The operating cost is lower than disposable batteries such as manganese dry batteries and alkaline dry batteries. [0003] One of the functions requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/46C08L23/00D04H1/544H01M2/16H01M50/417H01M50/489
CPCD04H1/544D01F6/04H01M2/1653D01F6/46D04H1/4291C08L2205/16C08L23/02C08L23/10H01M10/28Y02E60/10H01M50/44H01M50/417H01M50/489C08L51/06D01F6/06
Inventor 西坂考平沟渕章夫山崎泰久
Owner NIPPON KODOSHI
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