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 maintaining excellent performance, uniform product thickness, and reducing energy consumption

Active Publication Date: 2014-08-13
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 the polyolefin resin into the twin-screw extruder through different feeding ports. 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 example uses hindered phenolic antioxidant β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, code 1076, and the polyolefin resin is viscous Polyethylene resin with an average molecular weight of 500,000 and a viscosity grade of liquid paraffin of 45.

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

[0044] (3) The melt is continuously extruded from the die, and rapidly cooled and formed by cooling rollers to obtain thick sheets. Wherein, the temperatu...

Embodiment 2

[0050] (1) First, dissolve the antioxidant in liquid paraffin, and then inject the polyolefin resin into the twin-screw extruder through different feeding ports. 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 the present embodiment is phosphite antioxidant dioctadecyl pentaerythritol diphosphite, code name 618 or PEP-8T; Polyolefin resin is polyethylene resin with molecular weight 1,000,000, liquid paraffin The viscosity grade is 70.

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

[0053] (3) The melt is continuously extruded from the die, and rapidly cooled and formed by cooling rollers to obtain thick sheets. Wherein, the temperature of the cooling roll is contro...

Embodiment 3

[0058] (1) First, dissolve the antioxidant in liquid paraffin, and then inject the polyolefin resin into the twin-screw extruder through different feeding ports. 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 didodecyl thiodipropionate, code-named PS800 or DLTDP; the polyolefin resin is a polyethylene resin with a molecular weight of 200,000 and 2 million mixed in a ratio of 1:9, and the liquid Paraffin wax has a viscosity grade of 75.

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

[0061] (3) The melt is continuously extruded from the die, and rapidly cooled and formed by cooling rollers to obtain thick sheets. Wherein, the temperature of the cooling r...

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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, in particular to a method for preparing polyolefin microporous membranes by a wet method. Background technique [0002] In the known technology, the existing polyolefin microporous membrane preparation methods include melt stretching method (dry method) and thermally induced phase separation method (wet method). The process of wet manufacturing polyolefin microporous membrane is: mix liquid hydrocarbon or some small molecular substances with polyolefin resin, heat and melt to form a uniform mixture; then cool down to separate phases, and press to obtain a membrane; then the membrane The sheet is heated to a temperature close to the melting point, and biaxially stretched to orient the molecular chains; finally, it is kept for a certain period of time, and the residual solvent is eluted with volatile substances, thereby preparing an interpenetrating microporous membrane material. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08L23/00C08K5/134C08K5/524C08K5/372B29D7/01H01M2/16
CPCY02E60/10
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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