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Porous polyolefin film and its preparation method

A polyolefin and composite polyolefin technology, applied in the field of porous membranes, can solve the problem of large pore size, etc., and achieve the effects of improved dispersion uniformity, improved dispersion and less pollution

Active Publication Date: 2022-06-21
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 its preparation method
  • Porous polyolefin film and its preparation method
  • Porous polyolefin film and its preparation method

Examples

Experimental program
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preparation example Construction

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

[0029] S1. The water-soluble organic porogen and the inorganic porogen are mixed uniformly 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 coats the surface of the inorganic porogen, and the water-soluble organic porogen can also be used. Acting as a dispersion modifier for inorganic porogens and polyolefins, it can improve the dispersibility of subsequent mixing with polyolefins.

[0030] S2. The multi-stage composite porogen obtained in step S1 and the polyolefin are melt-blended and extruded in a twin-screw extruder in a mass ratio of 2%: 98% to 30%: 70%, and molded to obtain a composite polymer Olefin flakes;

[0031] S3. The composite...

Embodiment 1

[0043] A preparation method of a porous polyolefin membrane, comprising the following steps:

[0044] S1. Polyethylene glycol with a molecular weight of 5000 g / mol and a viscosity of 300 centipoise (200° C.) and calcium carbonate (2500 mesh) are dried and mixed uniformly in a mass ratio of 50%:50% to obtain a multi-level composite porosity 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, thereby improving the dispersibility of the subsequent mixing with the polyolefin.

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

[0046] S3. The composite...

Embodiment 2-5

[0049] A preparation method of a porous polyolefin membrane, compared with Example 1, the difference is that in steps S1 and S2, the mass ratio of polyethylene glycol and calcium carbonate is m 1 :m 2 and the mass ratio m of the multi-stage composite porosity material to polyethylene 3 :m 4 As shown in Table 1, the others are substantially the same as those in Embodiment 1, and are not repeated here.

[0050] Table 1 Preparation conditions and performance test results of Examples 2-5

[0051]

[0052] It can be seen from Table 1 that with the increase of the content of the porogen, 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 porogen, the secondary microporous structure of the porous film also increases accordingly.

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Abstract

The invention provides a polyolefin film with a multi-level porous structure and a preparation method thereof. First, the water-soluble organic porogen and the inorganic porogen are mixed uniformly to prepare a multi-level composite porogen material; then the polyolefin is melt-blended and extruded to form a composite polyolefin sheet; the biaxial stretching treatment is carried out in a water bath, and the The porogen is removed during stretching to obtain the porous polyolefin film. The invention uses the polyolefin material as the base material, and obtains the polyolefin membrane material with the micro-nano hierarchical pore structure on the surface through a multi-phase pore-inducing process. Water-bath immersion biaxial stretching treatment, in the process of water immersion extraction, biaxial stretching treatment is more conducive to the leaching of water-soluble organic porogens and inorganic porogens, realizing multi-phase pore formation and obtaining hierarchical pores Structural polyolefin membrane material. The preparation process is simple, the porous structure is highly adjustable, and it is suitable for industrialization, and can be widely used in the fields of medical protection and energy battery separators.

Description

technical field [0001] The invention relates to the technical field of porous films, in particular to a porous polyolefin film and a preparation method thereof. Background technique [0002] Porous polyolefin membranes are widely used in battery separators, separation membranes, medical protective materials, etc. 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 molecules as porogens to polyolefins and dissolve them in organic solvents to form cast sheets, then cool down to cause phase separation, extract small molecules with organic solvents, and form micropores ...

Claims

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Application Information

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Patent Type & Authority Patents(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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