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A kind of preparation method of polypropylene melt-blown battery diaphragm

A polypropylene melt-blown and battery separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problem that the barrier properties of positive and negative active materials are general, cannot be used in the field of battery separators, and the strength of melt-blown nonwovens is poor. and other problems, to achieve the effect of low price, excellent chemical purity and low cost

Active Publication Date: 2016-05-25
四川索玛新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the non-woven materials of battery separator are mainly processed by polyolefin spunbond method, which has a general barrier performance to the positive and negative active materials of the battery. Good performance, but melt-blown nonwovens have poor strength and poor hydrophilicity, and are considered by the industry to be unusable in the field of battery separators

Method used

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  • A kind of preparation method of polypropylene melt-blown battery diaphragm
  • A kind of preparation method of polypropylene melt-blown battery diaphragm
  • A kind of preparation method of polypropylene melt-blown battery diaphragm

Examples

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Embodiment 1

[0021] (1) Polypropylene melt-blown non-woven fabric battery separator processing: select the raw material of polypropylene slices with a melt index of 20g / 10min, add hydrophilic masterbatch with a mass ratio of 3%, and perform injection molding in a screw injection molding machine to obtain plasticization Uniform polypropylene melt, the screw injection molding machine adopts a single-screw injection molding machine composed of three-segment screws. In order to obtain high plasticizing capacity and output, an ultra-long screw with a length of 18d is used, and the diameter of the screw is 45mm; Fluctuation and uneven plasticization, choose a high-horsepower motor to drive to increase the driving force of the screw; the injection nozzle and the screw barrel passage are carefully designed to avoid the formation of dead angles, so that the material will not stay and be damaged by heat. High-precision thermistor temperature control is used to ensure accurate temperature control of t...

Embodiment 2

[0029] (1) Polypropylene melt-blown non-woven fabric battery separator processing: select the raw material of polypropylene slices with a melt index of 24g / 10min, add hydrophilic masterbatch with a mass ratio of 5%, and perform injection molding in a screw injection molding machine to obtain plasticization Uniform polypropylene melt, the screw injection molding machine adopts a single-screw injection molding machine composed of three-stage screws. In order to obtain high plasticizing capacity and output, an ultra-long screw with a length of 20d is used, and the diameter of the screw is 65mm; Fluctuation and uneven plasticization, choose a high-horsepower motor to drive to increase the driving force of the screw; the injection nozzle and the screw barrel passage are carefully designed to avoid the formation of dead angles, so that the material will not stay and be damaged by heat. High-precision thermistor temperature control is used to ensure accurate temperature control of the...

Embodiment 3

[0037] (1) Polypropylene melt-blown non-woven fabric battery separator processing: select the raw material of polypropylene slices with a melt index of 28g / 10min, add hydrophilic masterbatch with a mass ratio of 4%, and perform injection molding in a screw injection molding machine to obtain plasticization For uniform polypropylene melt, the screw injection molding machine adopts a single-screw injection molding machine composed of three-stage screws. In order to obtain high plasticizing capacity and output, an ultra-long screw with a length of 19d and a screw diameter of 60mm is used; in order to avoid the speed of the screw. Fluctuation and uneven plasticization, choose a high-horsepower motor to drive to increase the driving force of the screw; the injection nozzle and the screw barrel passage are carefully designed to avoid the formation of dead angles, so that the material will not stay and be damaged by heat. High-precision thermistor temperature control is used to ensure...

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Abstract

The invention relates to a preparation method of a polypropylene melt-blown battery separator, which includes the following steps: (1) Processing of a polypropylene melt-blown non-woven battery separator: selecting raw materials for polypropylene slices, adding hydrophilic masterbatches, and performing injection molding in a screw injection molding machine, The screw injection molding machine adopts a single-screw injection molding machine composed of three-segment screws. The temperature of the feeding zone, compression zone, melting zone and top nozzle of the screw barrel decreases with the increase of the melt index of the raw material of polypropylene slices; (2) Polypropylene melt blown Hydrophilic finishing of non-woven fabrics: acrylic acid, BPO and Tweenum80 are configured as standard treatment solutions, and polypropylene melt-blown non-woven fabrics are impregnated and grafted at 80-95°C; (3) Polypropylene melt-blown non-woven fabrics are heated for battery separators Rolling processing: use a linear bonding machine to hot-roll the grafted polypropylene melt-blown non-woven fabric at a hot-rolling temperature of 110-120°C and a hot-rolling pressure of 0.3-0.4Mpa. The invention improves the hydrophilicity and reinforcing method of nonwoven fabric produced by the polypropylene melt-blown method, and obtains a low-cost, high-performance battery separator.

Description

technical field [0001] The invention belongs to the field of development of novel battery diaphragm materials, and in particular relates to a preparation method of a novel polypropylene melt-blown battery diaphragm. Background technique [0002] Since 1960, with the emergence of stable synthetic materials, an independent diaphragm industry has emerged abroad, which has greatly promoted the battery diaphragm of batteries. The diaphragm has two important functions. In addition to avoiding the direct passage of any electron flow between the positive and negative electrodes, it also requires the resistance of the ion flow to be as small as possible. Therefore, choosing a porous nonconductor as the separator material can best meet these two opposing requirements. In the initial stage of battery development, polyamide fiber dry-laid nonwovens were used as separators. The polyamide diaphragm has good hydrophilicity and good electrolyte, so it is easy to obtain battery characteris...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/44
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 张才前卢林
Owner 四川索玛新材料科技有限公司
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