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Porous polyolefin film and preparation method thereof

A polyolefin and composite polyolefin technology, which is applied in the field of porous membranes and can solve problems such as large pore size

Active Publication Date: 2021-05-18
湖北拓盈新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the size of the prepared porous membrane material is limited by the size of calcium carbonate, and the prepared pore diameter is too large

Method used

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  • Porous polyolefin film and preparation method thereof
  • Porous polyolefin film and preparation method thereof
  • Porous polyolefin film and preparation method thereof

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Effect test

preparation example Construction

[0028] A kind of preparation method of porous polyolefin film provided by the invention comprises the following steps:

[0029] S1. Mix the water-soluble organic porogen and the inorganic porogen in a mass ratio (40%:60%)~(60%:40%) to obtain a multi-level composite porogen. The organic porogen is in The viscosity at 200°C is 300-3000 centipoise; the water-soluble organic porogen and the inorganic porogen are first mixed, and the water-soluble organic porogen is coated on the surface of the inorganic porogen, and the water-soluble organic porogen can also be Acting as a dispersion modifier for inorganic porogens and polyolefins, it can improve the dispersibility of subsequent mixing with polyolefins.

[0030] S2. Melt, blend and extrude the multi-stage composite porogenic material obtained in step S1 and polyolefin in a twin-screw extruder at a mass ratio of 2%: 98% to 30%: 70%, and shape it to obtain a composite polyolefin. Olefin flakes;

[0031] S3. Perform biaxial stretch...

Embodiment 1

[0043] A kind of preparation method of porous polyolefin film, comprises the following steps:

[0044] S1. the molecular weight is 5000g / mol, the viscosity is the polyethylene glycol of 300 centipoise (200 ℃) and calcium carbonate (2500 order) by mass ratio 50%: 50% dry, mix uniformly, obtain multistage composite porogenic material; The water-soluble polyethylene glycol and calcium carbonate are mixed first, and the polyethylene glycol is coated on the surface of the calcium carbonate, so as to improve the dispersibility when subsequently mixed with polyolefin.

[0045] S2. The multi-stage composite porogenic material obtained in step S1 and polyethylene are melt-blended and extruded in a twin-screw extruder at a mass ratio of 15%:85% (the temperature of melt-blending is 160° C.), flow Casting (the temperature of tape casting is 245°C, and the casting speed is 10m / min) to obtain composite polyethylene sheets;

[0046] S3. Perform biaxial stretching treatment on the composite ...

Embodiment 2-5

[0049] A kind of preparation method of porous polyolefin film, compared with embodiment 1, difference is, in steps S1 and S2, the mass ratio m of polyethylene glycol and calcium carbonate 1 :m 2 and the mass ratio of multi-level composite porogenic material to polyethylene m 3 :m 4 As shown in Table 1, the others are roughly the same as those in Embodiment 1, and will not be repeated here.

[0050] Preparation conditions and performance test results of table 1 embodiment 2-5

[0051]

[0052] It can be seen from Table 1 that with the increase of porogenic material content, the porosity of the porous membrane material increases, and the tensile strength of the membrane material decreases. In addition, with the increase of the organic porogen in the composite porogenic material, the secondary microporous structure of the porous membrane also increases correspondingly.

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Abstract

The invention provides a hierarchical pore structure polyolefin film and a preparation method thereof. The preparation method comprises the following steps: firstly, uniformly mixing a water-soluble organic pore-foaming agent and an inorganic pore-foaming agent to prepare a multi-stage composite pore-foaming material; melting, blending and extruding polyolefin, and molding the material to obtain a composite polyolefin sheet; and carrying out water bath dipping and two-way stretching treatment, and removing the pore-foaming agent in the stretching process to obtain the porous polyolefin film. Herein, a polyolefin material is used as a base material, and a polyolefin film material with a micro-nano hierarchical pore structure on the surface is obtained through a multi-phase pore-forming process. By means of water bath dipping bidirectional stretching treatment, the bidirectional stretching treatment is performed in the dipping extraction process in water, such that the leaching of the water-soluble organic pore-foaming agent and the inorganic pore-foaming agent is easily achieved, the multi-phase pore forming is achieved, and the hierarchical pore structure polyolefin film material is obtained. The preparation method has the characteristics of simple preparation process, high adjustability of the porous structure and suitability for industrialization, and can be widely applied to the fields of medical protection and energy battery diaphragms.

Description

technical field [0001] The invention relates to the technical field of porous membranes, in particular to a porous polyolefin membrane and a preparation method thereof. Background technique [0002] Porous polyolefin membranes are widely used in battery separators, separation membranes, and medical protective materials due to their excellent mechanical properties and chemical stability. The existing methods for preparing polyolefin porous membranes can be mainly divided into wet stretching process membranes and dry stretching process membranes according to different pore-forming principles. Among them, the dry stretching process can also be divided into a uniaxial stretching process and a biaxial stretching process. The wet preparation process is to add high-boiling-point small molecular substances as porogens to polyolefin and dissolve them in organic solvents to form cast sheets, then cool down to undergo phase separation, extract small molecules with organic solvents, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J9/26C08L23/06H01M50/403H01M50/417B29C55/16
CPCC08J5/18C08J9/26B29C55/16C08J2323/06C08J2201/0444C08J2201/044C08J2201/0464
Inventor 刘开宇王栋朱志敏赵青华闵蓉
Owner 湖北拓盈新材料有限公司
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