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Method for preparation of polyolefin microporous membrane by wet process

A technology of polyolefin microporous film and polyolefin resin, which is applied in the direction of flat products, applications, electrical components, etc., to achieve the effects of delaying thermal oxygen degradation, improving orientation degree, and reducing production costs

Active Publication Date: 2013-01-02
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a simple process, which can solve the occurrence of thermo-oxidative degradation and carbonization of polyolefin resins in the high-temperature processing process in the prior art, more uniform mixing and dispersion of antioxidants and polyolefin resins, and oxidation resistance. Method for preparing polyolefin microporous membrane by wet method in which solvent can be removed during solvent extraction

Method used

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  • Method for preparation of polyolefin microporous membrane by wet process
  • Method for preparation of polyolefin microporous membrane by wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) First, dissolve the antioxidant in liquid paraffin, and then inject it into the twin-screw extruder through different feed ports from the polyolefin resin. Among them, the mass ratio of antioxidant to polyolefin resin is 1:5000, and the mass ratio of polyolefin resin to liquid paraffin is 1:2;

[0042] The antioxidant in this embodiment adopts the hindered phenolic antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, code 1076, polyolefin resin is viscous Polyethylene resin with an average molecular weight of 500,000, liquid paraffin has a viscosity grade of 45.

[0043] (2) In the extruder, the above-mentioned raw materials are melted and mixed into a uniform melt under the mixing, dispersion and shearing action of the twin screw. Among them, the gradient control temperature range is between 60 and 210°C.

[0044] (3) The melt is continuously extruded from the die, and rapidly cooled by a cooling roller to form a thick sheet. Among them, the temper...

Embodiment 2

[0050] (1) First, dissolve the antioxidant in liquid paraffin, and then inject it into the twin-screw extruder through different feed ports from the polyolefin resin. Among them, the mass ratio of antioxidant to polyolefin resin is 1:2000, and the mass ratio of polyolefin resin to liquid paraffin is 1:4.5;

[0051] The antioxidant used in this example is a phosphite antioxidant dioctadecyl pentaerythritol bisphosphite, code 618 or PEP-8T; the polyolefin resin is a polyethylene resin with a molecular weight of 1 million, liquid paraffin The viscosity grade is 70.

[0052] (2) In the extruder, the above-mentioned raw materials are melted and mixed into a uniform melt under the mixing, dispersion and shearing action of the twin screw. Among them, the gradient control temperature range is between 60 and 210°C.

[0053] (3) The melt is continuously extruded from the die, and rapidly cooled by a cooling roller to form a thick sheet. Among them, the temperature of the cooling roll is con...

Embodiment 3

[0058] (1) First, dissolve the antioxidant in liquid paraffin, and then inject it into the twin-screw extruder through different feed ports from the polyolefin resin. Among them, the mass ratio of antioxidant to polyolefin resin is 1:1000, and the mass ratio of polyolefin resin to liquid paraffin is 1:6;

[0059] The antioxidant used in this example is dilauryl thiodipropionate, code-named PS800 or DLTDP; polyolefin resin is a mixture of polyethylene resin with a molecular weight of 200,000 and 2 million in a ratio of 1:9, liquid The viscosity grade of paraffin wax is 75.

[0060] (2) In the extruder, the above-mentioned raw materials are melted and mixed into a uniform melt under the mixing, dispersion and shearing action of the twin screw. Among them, the gradient control temperature range is between 70-220℃.

[0061] (3) The melt is continuously extruded from the die, and rapidly cooled by a cooling roller to form a thick sheet. Among them, the temperature of the cooling roll i...

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Abstract

The invention relates to a method for preparation of a polyolefin microporous membrane by a wet process. According to the method, polyolefin resin, an antioxidant and liquid paraffin are adopted as raw materials for preparation of the microporous membrane through a thermally induced phase separation method. Employment of the preparation method provided in the invention can effectively prevent thermal oxidative degradation and carbonization phenomena in a high temperature processing process of polyolefin resin. The antioxidant and the polyolefin resin are mixed and dispersed more uniformly, and the antioxidant can be removed during liquid paraffin extraction, so that the pure and high performance polyolefin microporous membrane can be obtained.

Description

Technical field [0001] The invention belongs to the technical field of polymer materials, and particularly relates to a method for preparing a polyolefin microporous membrane by a wet method. Background technique [0002] In the known technology, the existing preparation methods of polyolefin microporous membranes include melt stretching method (dry method) and thermally induced phase separation method (wet method). The process of wet manufacturing of polyolefin microporous membranes is: mixing liquid hydrocarbons or some small molecular substances with polyolefin resins, heating and melting to form a uniform mixture; then cooling for phase separation, and pressing to obtain a membrane; The sheet is heated to a temperature close to the melting point, biaxially stretched to align the molecular chains; finally, it is kept for a certain period of time, and the residual solvent is eluted with volatile substances to prepare interpenetrating microporous membrane materials. [0003] Due ...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L23/00C08K5/134C08K5/524C08K5/372B29D7/01H01M2/16
CPCY02E60/12Y02E60/10
Inventor 宋红芹韩继庆张永升郑文耀千昌富
Owner 乐凯胶片股份有限公司
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