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Polypropylene microporous isolation membrane and preparation method and application thereof

A technology of polypropylene and isolation membrane, which is applied in the field of polypropylene microporous isolation membrane and its preparation, can solve the problems of increased safety hazards, low closing temperature of microporous membranes, and inability to improve mechanical properties and puncture strength, etc., to achieve Reduce environmental pollution, prepare environmental protection, environmental pollution and the effect of high preparation cost

Active Publication Date: 2019-12-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low melting point of the polyolefin material itself, the closed cell temperature of the microporous membrane obtained by the invention patent is low, the thermal dimensional stability at high temperature is not good, and the mechanical properties and puncture strength cannot be improved. Easier to increase security risks

Method used

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  • Polypropylene microporous isolation membrane and preparation method and application thereof
  • Polypropylene microporous isolation membrane and preparation method and application thereof
  • Polypropylene microporous isolation membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Dissolve initiator BPO, antioxidant 1010 and vinyl tris (β-methoxyethoxy) silane in 100 mL of acetone to obtain a reactive solution; then add pure polypropylene and mix evenly in a high-speed mixer, Obtain the polypropylene graft material solution with active group; Wherein, the mass ratio of initiator, antioxidant and active reactant vinyl tris (beta-methoxyethoxy) silane and polypropylene is 0.3:0.5:1 : 98.2;

[0050] (2) The polypropylene graft material solution with active groups prepared in step (1), nano silicon dioxide and pure polypropylene material are mixed uniformly in a high-speed mixer to obtain different polypropylene grafts with active groups. The blend of branch material content, wherein, the mass ratio that has the polypropylene graft material of active group, nano silicon dioxide and pure polypropylene material is (2,5,8,10):0.1:(98,95 , 92, 90);

[0051] (3) extruding and granulating the blend prepared in step (2) through a twin-screw extruder to ...

Embodiment 2

[0056] (1) Dissolve initiator BPO, antioxidant 1010 and vinyl tris (β-methoxyethoxy) silane in 100 mL of acetone to obtain a reactive solution; then add pure polypropylene and mix evenly in a high-speed mixer, Obtain the polypropylene graft material solution with active group; Wherein, the mass ratio of initiator, antioxidant and active reactant vinyl tris (beta-methoxyethoxy) silane and polypropylene is 0.3:0.5:1 : 98.2;

[0057] (2) the polypropylene graft material solution, nano-silica and pure polypropylene material that step (1) is prepared with active groups are mixed in a high-speed mixer to obtain a blend, wherein, there are active groups The mass ratio of polypropylene graft material, nano-silica and pure polypropylene material is 8:0.1:92;

[0058] (3) Extrude and granulate the blend prepared in step (2) through a twin-screw extruder to obtain pre-purpose pellets for polypropylene with active groups; figure 1 and figure 2 It can be seen that the silane groups are...

Embodiment 3

[0063] (1) Dissolve initiator BPO, antioxidant 1010 and vinyl tris (β-methoxyethoxy) silane in 100 mL of acetone to obtain a reactive solution; then add pure polypropylene and mix evenly in a high-speed mixer, Obtain the polypropylene graft material solution with active group; Wherein, the mass ratio of initiator, antioxidant and active reactant vinyl tris (beta-methoxyethoxy) silane and polypropylene is 0.1:0.2:0.1 : 99.6;

[0064] (2) the polypropylene graft material solution, nano-silica and pure polypropylene material that step (1) is prepared with active groups are mixed in a high-speed mixer to obtain a blend, wherein, there are active groups The mass ratio of polypropylene graft material, nano-silica and pure polypropylene material is 10:0.02:90;

[0065] (3) extruding and granulating the blend prepared in step (2) through a twin-screw extruder to obtain pre-purpose pellets for polypropylene with active groups;

[0066] (4) Melting, extruding, casting and blow molding...

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Abstract

The invention belongs to the technical field of battery isolation membrane preparation, and particularly relates to a polypropylene microporous isolation membrane and a preparation method and application thereof. The preparation method comprises the steps of grafting polypropylene graft materials with active groups on a polypropylene molecular chain in a melt grafting mode by adopting a grafting reaction principle to obtain polypropylene pre-used granules with the active groups; and carrying out melt extrusion, casting and blow molding on the pre-used granules into a membrane through a singlescrew extruder by adopting a melt drawing method to obtain an initial cast membrane, and then sequentially carrying out heat treatment, hot drawing, heat setting on the and initial cast membrane and re-setting the initial cast membrane in hot water for 3-7 h to obtain the polypropylene microporous isolation membrane. According to the isolation membrane, the problems of poor high-temperature thermal dimensional stability, low mechanical property and poor air permeability of an existing isolation membrane are overcome, and the potential safety hazards in battery operation are greatly avoided.

Description

technical field [0001] The invention belongs to the technical field of battery separator preparation, and in particular relates to a polypropylene microporous separator and its preparation method and application. Background technique [0002] Polyolefin microporous membranes are widely used as separators in lithium-ion batteries, and separators are the core components of lithium-ion batteries, accounting for about 18-30% of the cost of lithium-ion batteries. The quality of its performance plays a vital role in the overall performance of lithium batteries, and it is also one of the key technologies restricting the development of lithium batteries. With the development of electronic products and the expansion of application fields, people's requirements for the performance of lithium batteries are also getting higher and higher. In order to meet the development requirements of lithium batteries, the microporous separator should have high mechanical strength, excellent thermal...

Claims

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Application Information

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IPC IPC(8): B29D7/01H01M2/14H01M2/16B29K23/00B29K105/04
CPCB29D7/01B29K2023/12B29K2105/041H01M50/403H01M50/411Y02E60/10
Inventor 赵艳彭文磊谢嘉宜雷彩红徐睿杰
Owner GUANGDONG UNIV OF TECH