Polyolefin synthetic paper-pulp capable of being used for producing battery separator

A battery separator, polyolefin technology, applied in the direction of paper, etc., can solve the problems of poor thermal sealing and thermal adhesion, unsatisfactory thermal sealing and thermal adhesion, etc., and achieve stable thermal sealing and thermal adhesion, excellent internal bonding force Effect

Inactive Publication Date: 2008-08-20
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although heat-sealing paper made of PP monofilaments exhibits excellent heat-sealing properties and hot-tack properties in the high-temperature range, they are poor in low-temperature ranges.
[0005] On the other hand, although the thermal sealing and thermal tackiness of the heat-sealing paper made from PE synthetic pulp is better than that of the heat-sealing paper made from PP single fiber in the low temperature range, it is different from the heat-sealing paper made from PP single fiber. Compared with the obtained heat-sealing paper, its heat-sealing and hot-tack properties in the high temperature range are not satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 20 liters of n-hexane (23°C), 20 liters of water (23°C), 1000 grams of ethylene / 1-butene modified with maleic acid to an 80-liter autoclave equipped with baffles and stirrers. According to ASTMD-1238, the MFR measured under 190°C and 2.16kg load is 3g / 10min, the melting point is 123°C, and the graft ratio is 0.6%) and 20 grams of polyvinyl alcohol (PVA, saponification degree is 99%, The viscosity of 4% aqueous solution (20 ℃) ​​is 4.6-6.0 centipoise, trade name is GOhsenOl NL-05, purchased from NippOnSynthetic Chemical Industry co., Ltd.). The liquid mixture was heated to 145°C while stirring at 900 rpm. Subsequently, the liquid mixture was further stirred for 30 minutes while maintaining the temperature at 145°C. A suspension is thus obtained. Then, from a nozzle with a diameter of 3 mm and a length of Z0 mm mounted on the autoclave, the suspension is flashed through a pipeline into a drum, thereby quickly evaporating the solvent, and the drum is nitrogen atmosph...

Embodiment 2

[0037] Synthetic pulp and mixed paper were prepared in the same manner as in Example 1 (heat treatment temperature was 145°C), but maleic acid modified ethylene homopolymer (measured at 190°C and 2.16kg load according to ASTMD-1238 The MFR is 5.2g / 10min, the melting point is 134 ° C, the graft ratio is 0.44%) to replace the maleic acid drunk modified ethylene octa-butene random copolymer. The heat seal strength, breaking length and internal bonding force of the hybrid paper thus obtained were measured by the methods described above.

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Abstract

The invention relates to the technical field of polyolefine synthetic paper pulp used for manufacturing a battery septum. The polyolefine synthetic paper pulp of the invention that can be used for manufacturing the battery septum includes a polyolefine resin composition. The polyolefine resin composition includes 60 to 100 percent by weight of ethene, the multipolymer of unsaturated carboxylic acid and 10 to 50 percent by weight of polythene resin. The thickness of the battery septum, etc. can be reduced to the greater degree by using the polyolefine synthetic paper pulp of the invention. A second polyolefine synthetic paper pulp of the invention consisting of ethene / a, p-multipolymer of unsaturated carboxylic acid and polythene resin shows stable thermal sealing property and thermal viscosity in a broad thermal sealing temperature range from low temperature to high temperature.

Description

technical field [0001] The invention relates to the technical field of polyolefin synthetic pulp used as battery diaphragm. Background technique [0002] Currently, polypropylene (PP) monofilament and polyolefin synthetic pulp are widely used as binders for bonding inorganic powders in battery separators, molded fiberboards, and the like. They are also widely used in heat-sealing papers, such as tea bags, sterilization paper and drying bags. [0003] Recently, in the fields of battery separators, molded fiberboards, heat-sealing papers, and the like using PP monofilaments and polyolefin synthetic pulps, cost reductions by reducing the thickness have been demanded. The fibers forming the synthetic pulp must have a large breaking length and high internal bonding force, which can reduce the thickness of battery separators, molded fiberboards and heat-sealing papers, etc. However, conventional PP fibers and polyolefin synthetic pulps do not always have a large fiber breaking l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/14D21H13/18
Inventor 聂君兰
Owner SHENZHEN SENIOR TECH MATERIAL
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