Low-pore closing high-diaphragm splitting polyolefin diaphragm and preparation method thereof

A polyolefin membrane, polyethylene technology, applied in structural parts, electrical components, battery pack components and other directions, can solve the problems of low closed-cell temperature characteristics, affecting the uniformity of mixing, high film breaking temperature characteristics, etc. Duration, reduction of grain boundary defects, effect of high film breaking temperature

Active Publication Date: 2020-01-03
CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyethylene and polypropylene have poor compatibility, which affects the uniformity of the mixture in the melting process, resulting in large deviations in film thickn

Method used

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  • Low-pore closing high-diaphragm splitting polyolefin diaphragm and preparation method thereof
  • Low-pore closing high-diaphragm splitting polyolefin diaphragm and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0029] First, branched polyethylene (PE2a) with a melting point of 125°C and a branching degree of 3.3 is mixed with a compound containing methacrylate-perfluorophenyl azide, and the azide group is activated by ultraviolet radiation to form an active azide compound, and linked to branched polyethylene through covalent bonds. Then the perfluorophenyl azide grafted branched polyethylene is dissolved in the cyclohexane solvent, and by ultrasonic treatment for about 0.5h, under anaerobic conditions, 0.3wt% triethylaluminum is added as an initiator, and The solution is heated to 70° C., propylene monomer is passed through, and reacted at this temperature for 5 hours to obtain polypropylene grafted branched polyethylene.

[0030] a. Ingredients melting: Polyethylene with a melting point of 109°C (denoted as PE1), polypropylene grafted branched polyethylene with a melting point of 125°C (denoted as PE2b), and polyethylene with a melting point of 135°C (denoted as PE3) , Polypropylen...

Embodiment 2

[0039] Embodiment 2 differs from Embodiment 1 in that: PE1, PE2b, PE3, and PP are arranged in a mass ratio of 1:7:2:9.

Embodiment 3

[0041] Embodiment 3 differs from Embodiment 1 in that: PE1, PE2b, PE3, and PP are arranged in a mass ratio of 0:8:2:9.

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Abstract

The invention discloses a low-pore closing high-diaphragm splitting polyolefin diaphragm and a preparation method thereof. The polyolefin diaphragm is mainly formed by blending polyethylene, polypropylene and polypropylene grafted branched polyethylene; and the polyethylene comprises low-melting-point polyethylene and high-melting-point polyethylene. Thus, the problem of compatibility of polyethylene and polypropylene is solved, the homogeneous phase capability of polyethylene and polypropylene in a molten state is improved, so that polypropylene molecular chains are interspersed among polyethylene molecular chains, a rigid skeleton supporting effect is achieved, and the diaphragm is prevented from being split, thereby acquiring relatively high diaphragm splitting temperature and excellentthermal shrinkage performance. In addition, through blending of high/low melting point polyethylene, the melting starting temperature of the blended polyethylene is reduced, the melting range is prolonged, the duration of the pore closing process is prolonged, and the continuous pore closing characteristic is formed.

Description

technical field [0001] The invention belongs to the field of diaphragm materials for lithium batteries, and in particular relates to a polyolefin diaphragm with low closed cells and high membrane rupture and a preparation method thereof. Background technique [0002] Polyolefin microporous membranes are used for precision filtration membranes, separators for batteries, separators for capacitors, materials for fuel cells, etc. Among these uses, when used as a separator for batteries, especially when used as a separator for lithium ion batteries, the polyolefin microporous membrane is required to have excellent ion permeability, excellent mechanical strength, and the like. [0003] In order to ensure the safety of batteries, "low closed cell temperature characteristics", "high membrane rupture temperature characteristics" and "low heat shrinkage" are required for separators for high-capacity batteries in recent years. In addition, in order to reduce variations in battery char...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/411Y02E60/10
Inventor 陶晶王志豪李伟陈强袁其振杨影杰
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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