A kind of preparation method of porous polyethylene film

A polyethylene film and membrane technology, which is applied in the field of materials, can solve the problems of restricting the use of polyethylene porous membranes and the inability to continuously adjust the thickness and pore size of polyethylene porous membranes.

Active Publication Date: 2021-09-21
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the film thickness and pore size of the polyethylene porous membrane prepared by the prior art cannot be continuously adjusted, thus limiting the use of the polyethylene porous membrane

Method used

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  • A kind of preparation method of porous polyethylene film
  • A kind of preparation method of porous polyethylene film
  • A kind of preparation method of porous polyethylene film

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preparation example Construction

[0028] The embodiment of the present invention discloses a method for preparing a porous polyethylene film, which includes the following steps: mixing polyethylene with a mass ratio of 1 to 10:1 and a pore-forming agent to obtain a first mixture, and the pore-forming agent includes poly Ethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer; the first mixture is melt-mixed in an internal mixer to obtain a mixed melt, and the temperature of melt-mixing is 170-230°C , the time for melting and mixing is 2 to 30 minutes; the mixed melt is subjected to high-temperature compression molding to obtain a diaphragm; the diaphragm is cooled to remove the pore-forming agent in the diaphragm; the diaphragm is placed in a two-way Stretching in a stretching machine, heat setting and slow cooling to obtain a porous polyethylene film, the stretching temperature is 50-130°C, and the heat setting temperature is 80-130°C.

[0029] As a preferred solution, the polyethylene includ...

Embodiment 1

[0041] Add 5.0 grams of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer F127 to 45.0 grams of low-density polyethylene (LDPE) powder, mix well; In the feeding chamber of the internal mixer, seal it, start the screw for mixing, wait for the torque curve fed back by the mixed solution to be stable (the process is about 5min), stop mixing; then quickly transfer the mixed melt to a place that has been preheated to 200°C tableting mold, and put the whole into a tablet press that has been preheated to 220°C for tablet molding. During the tablet pressing process, first run the upper mold of the tablet press to the position where it contacts the upper surface of the forming mold and pause for 2 minutes, keep warm, pressurize again until it is completely closed, and keep the pressure for 5 minutes; Perform rapid cooling, soak and wash in a mixture of ethanol and water at 80°C for 30 minutes, take it out and dry it in the air; finally place the film in the f...

Embodiment 2

[0046] Add 7.5 grams of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer F127 to 42.5 grams of high-density polyethylene (HDPE) powder, mix well; In the feeding chamber of the internal mixer, seal it, start the screw for mixing, wait for the torque curve fed back from the mixed melt to be stable, and stop mixing; then quickly transfer the mixed melt to the tableting mold that has been preheated to 200°C , and put the whole into a tablet press that has been preheated to 220°C for tablet molding. During the tablet pressing process, first run the upper mold of the tablet press to the position where it contacts the upper surface of the forming mold and pause for 2 minutes, keep warm, pressurize again until it is completely closed, and keep the pressure for 5 minutes; Perform rapid cooling, soak and wash in a mixture of ethanol and water at 80°C for 30 minutes, take it out and dry it in the air; finally place the film in the fastening clip of the biaxial...

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Abstract

The invention provides a method for preparing a porous polyethylene film, using polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer as a pore-forming agent, and the pore-forming agent serves as a microporous structure-guiding The template is added to the polyethylene, the mixed material is mixed and melted at high temperature, and then pressed into a tablet, and then the film is cooled and the polyethylene oxide-polypropylene oxide-polyethylene oxide triembedding in the film is removed Segment copolymer, and then use a biaxial stretching machine to expand the pores, and obtain a porous polyethylene film with a non-through porous structure after heat setting. The present invention controls the size of the prepared porous film by adjusting the amount of pore-forming agent; on the other hand, stretches the film, and realizes the preparation of the prepared porous polyethylene film by controlling the stretching temperature, tensile strength and other conditions. Continuous adjustment of hole size. In addition, the preparation method provided by the invention has a simple process, is environmentally friendly and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a preparation method of a porous polyethylene film. Background technique [0002] Polyolefin porous membrane has excellent mechanical properties, chemical resistance and electrochemical properties, and is widely used in separation membrane materials, selective permeation separation membrane materials, packaging membrane materials, medical film materials, and isolation membrane materials for various substances. And electrical thin film materials and other fields. Among them, in the application of lithium-ion battery separators, the function and role of polyolefin porous membranes are particularly obvious. Polyolefin porous membranes are used as functional components to separate the positive electrode from the negative electrode and allow ions to pass through, as well as to prevent high temperature inside the battery, The separation and isolation of dangerous conditions such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J9/26B29D7/01C08L23/06
CPCB29D7/01C08J5/18C08J9/26C08J2323/06
Inventor 程文广陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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