High-density polyethylene resin composition for microporous membrane and preparation method of high-density polyethylene resin composition

A technology of high-density polyethylene and resin composition, which is applied in the field of synthesis of organic polymer compounds, can solve the problems of microporous diaphragm overall performance degradation, microporous diaphragm non-uniform stretching, etc., and achieve high porosity and uniform pore size distribution , high tensile strength and puncture strength effects

Active Publication Date: 2013-10-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of this method is that in the casting process, due to the different crystallization temperatures of the two polymers, phase separation inevitably occurs, so that the microporous membrane is partially stretched non-uniformly during stretching, resulting in the overall performance of the microporous membrane. deterioration

Method used

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  • High-density polyethylene resin composition for microporous membrane and preparation method of high-density polyethylene resin composition
  • High-density polyethylene resin composition for microporous membrane and preparation method of high-density polyethylene resin composition
  • High-density polyethylene resin composition for microporous membrane and preparation method of high-density polyethylene resin composition

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Embodiment 1 (preparation of high-density polyethylene powder)

Embodiment 1-1

[0061] According to the preparation method of high-density polyethylene powder for wet-process lithium-ion battery microporous diaphragms involved in the present invention, in a certain amount of hexane solvent, sequentially add cocatalyst triethylaluminum, main catalyst (BCE-C type Catalyst), stirring and mixing for about 1 hour under the protection of nitrogen, and continuously adding fresh ethylene, hydrogen, etc. through the metering pump to the first reactor of the CX high-density polyethylene process device in series with two reactors for slurry polymerization, and the materials are evenly distributed in the reactor The residence time is about 1 to 2 hours to obtain the polyethylene component I; after the material is flashed to remove volatile components, it enters the second reactor; no new catalyst and hydrogen are added to the second reactor, and the continuous flow Enter ethylene and comonomer butene-1, and the average residence time of the materials is about 2 hours ...

Embodiment 1-2

[0066] It is basically the same as Example 1-1, but with the following changes:

[0067] The ethylene feed rates of the first reactor and the second reactor were changed to 4t / h and 6t / h respectively;

[0068] The α-olefin in the first reactor and the second reactor is changed to propylene, and the feed rate is changed into 10kg / h and 20kg / h respectively;

[0069] The hydrogen / ethylene volume ratio of the first reactor is changed to 0.5-2.0%;

[0070] The temperature of the second reactor is controlled at 72-76°C.

[0071] The specific production process control parameters of the reactor are shown in Table 2. The high-density polyethylene powder for wet-process lithium-ion battery microporous separator is recorded as HDPE-2, and the test results are shown in Table 7.

[0072] The production process parameter of table 2 embodiment 1-2

[0073]

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Abstract

The invention provides a high-density polyethylene resin composition for a microporous membrane. The composition comprises the following components by weight percent: 17% to 50% of polyethylene powder, 0.1% to 1% of antioxidant and 50% to 83% of diluent. The high-density polyethylene resin composition for the microporous membrane is suitable for industrial production and is a uniform system which can be dissolved and mixed well. The composition is especially suitable for serving as a polyethylene composition material for the microporous membrane of a lithium ion battery in a wet process.

Description

technical field [0001] The invention relates to a high-density polyethylene resin which can be used for preparing microporous membranes and a preparation method thereof, and belongs to the technical field of synthesis of organic polymer compounds. Background technique [0002] Microporous separators are a critical component of lithium-ion battery safety. From the structural point of view, the microporous diaphragm is a kind of electrically insulating film with a porous shape. Its main function is to isolate the positive and negative electrodes while allowing ions to pass freely between the positive and negative electrodes in the electrolyte solution. The performance of the microporous separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and other characteristics of the battery. At the same time, the microporous diaphragm can also block the current conduction in the battery by closing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/04B29C47/92C08F10/02B29C48/92
CPCB29C2948/92704B29C2948/92895B29C48/405B29C48/40C08F210/16C08F110/02C08F2/001C08F210/08C08F2500/26C08F2500/07
Inventor 左胜武傅勇邱敦瑞徐振明张宝强柯卓尚小杰
Owner CHINA PETROLEUM & CHEM CORP
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