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A kind of preparation method of silica self-assembly adsorption polypropylene microporous membrane

A technology of polypropylene microporous membrane and silicon dioxide, which is applied in the direction of secondary batteries, battery components, electrochemical generators, etc., can solve the problems of poor heat resistance and hydrophilicity, and achieve heat resistance and affinity Improvement of water property, good hydrophilicity and heat resistance, effect of improved hydrophilicity and heat resistance

Active Publication Date: 2020-04-28
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of poor heat resistance and hydrophilicity of polypropylene microporous membranes in the prior art

Method used

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  • A kind of preparation method of silica self-assembly adsorption polypropylene microporous membrane
  • A kind of preparation method of silica self-assembly adsorption polypropylene microporous membrane
  • A kind of preparation method of silica self-assembly adsorption polypropylene microporous membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) Get 11.8g α-methylstyrene (AMS), 109.9g dimethylaminoethyl methacrylate (DMAEMA), 2.434g initiator AIBN, and 120g xylene are added in the reaction vessel to form a solution, and feed N 2 After deoxygenation for 30 minutes, react at 75°C for 24h. After the reaction, the product is precipitated with ice petroleum ether, and the product is dried at 65°C to obtain the macromolecular initiator PAD;

[0043] (2) Get 700g polypropylene and 28g macromolecular initiator PAD to carry out melt grafting reaction by twin-screw extruder, obtain graft PP-g-PAD, stand-by after product drying;

[0044](3) The graft PP-g-PAD is prepared by a casting machine with a base film with an oriented lamellar structure, and the base film is annealed at 145°C to obtain an annealed film, and the annealed film is cold-drawn at room temperature by 25%, 145 100% hot drawing at ℃, and heat setting at 145℃ for 30 minutes to obtain a cationic microporous membrane;

[0045] (4) Take 14g of ammonia wat...

Embodiment 2

[0047] All the other operations are the same as in Example 1, except that the immersion time of the polypropylene microporous membrane in the silica sol is different from that in Example 1.

Embodiment 3

[0049] All the other operations are the same as in Example 1, except that the silica sol concentration is different from that in Example 1.

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Abstract

The invention belongs to the field of polymer functional films and their preparation, and in particular relates to a method for preparing a silica self-assembled adsorption polypropylene microporous membrane. By synthesizing the macroinitiator P (AMD‑co‑DMAEMA) (PAD for short), and performing melt grafting to polypropylene to obtain the graft PP‑g‑PAD, the graft is cast and post-stretched to obtain the cationic Polypropylene microporous membrane; nano-SiO synthesized by sol-gel method 2 sol, and uses self-assembly to adsorb SiO 2 The method obtains silica self-assembled adsorption polypropylene microporous membrane. The heat resistance of the silica self-assembled adsorption polypropylene microporous membrane prepared according to the present invention is greatly improved. The thermal shrinkage rate of the microporous membrane stored at 130°C for 30 minutes is only about 7.5%. At the same time, the hydrophilicity is also improved. Greatly improved, the water contact angle can be reduced to 42.5°.

Description

technical field [0001] The invention belongs to the field of polymer functional films and preparation thereof, in particular to a preparation method of silicon dioxide self-assembled adsorption polypropylene microporous film. Background technique [0002] The most commonly used lithium-ion battery in the battery industry has the advantages of high working voltage, light weight, high specific energy, wide application temperature range, long cycle life, high energy storage efficiency, and has excellent performances such as no pollution to the environment and good safety. Currently the most ideal green secondary energy in the 21st century. Lithium-ion batteries are usually composed of four parts: positive electrode, negative electrode, electrolyte solution and separator. The separator is the most important part of lithium-ion batteries. Lithium-ion battery separators mainly use polyolefin microporous membranes, such as polypropylene (PP) and The important function of polyethyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/00C08J9/36C08G81/02C08F220/34C08F212/12H01M2/14H01M2/16H01M10/0525C08L87/00H01M50/403H01M50/411
CPCH01M10/0525C08F212/12C08F220/34C08G81/021C08J5/18C08J9/00C08J9/36C08J2387/00H01M50/403H01M50/411Y02E60/10
Inventor 蒋姗王伟俞强张洪文丁永红
Owner CHANGZHOU UNIV