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Preparation method of UPE porous membrane

A technology of porous membrane and liquid membrane, which is applied in the field of membrane materials, can solve the problems of uneven distribution of separation membrane pore size, limit the development of UPE separation membrane, and poor capture ability of impurity particles, and achieve convenient preparation method, great economic value, suitable for The effect of mass production

Active Publication Date: 2021-09-17
HANGZHOU COBETTER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, there have been many reports on the development of polyolefin separation membranes by thermally induced phase separation (TIPS). For example, ultra-high molecular weight polyethylene (UPE) is difficult to use conventional Therefore, it is necessary to use the TIPS method to obtain a polyolefin separation membrane with a corresponding pore size; but the traditional TIPS method also has certain shortcomings in the preparation of UPE separation membranes. For example, the separation membrane prepared by this method has The pore size distribution is uneven, which easily leads to low filtration accuracy of the separation membrane and poor ability to capture impurity particles, which cannot meet the needs of practical applications, which greatly limits the development of UPE separation membranes

Method used

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  • Preparation method of UPE porous membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0055] A kind of preparation method of UPE porous film, comprises the following steps:

[0056] S1: Add polyethylene resin to the solvent system composed of compound A and compound B, stir and mix, and mix uniformly to form a mixed material; wherein the polyethylene resin is an ultra-high molecular weight polyethylene with a mass average molecular weight of 4 million; The bulk density of vinyl resin is 0.26g / cm 3 ; Compound A is a non-solvent for polyethylene resin; Compound B is a solvent for polyethylene resin; Compound A is dioctyl adipate, and Compound B is paraffin oil;

[0057] The mixed material comprises the following components by weight: polyethylene resin: 14 parts; compound A: 58 parts; compound B: 28 parts;

[0058] S2: Put the mixed material into the extruder at a temperature of 160-250°C to heat, melt and knead for 20 minutes to form a casting liquid, and then extrude through a die to form a liquid film; the extrusion temperature of the die is 235 ℃; the extru...

Embodiment 2

[0064] A kind of preparation method of UPE porous film, comprises the following steps:

[0065] S1: Add polyethylene resin to the solvent system composed of compound A and compound B, stir and mix, and mix uniformly to form a mixed material; compound A is a non-solvent for polyethylene resin; compound B is a solvent for polyethylene resin; compound A It is dimethyl phthalate; the compound B is white oil; the polyethylene resin is composed of 75% by mass of ultra-high molecular weight polyethylene with a mass average molecular weight of 4.5 million and 25% by mass with a mass average molecular weight of 1.5 million And the density is 0.92-0.98g / cm 3 Composition of high-density polyethylene; bulk density of polyethylene resin 0.22g / cm 3 ;

[0066] The mixed material comprises the following components by weight: polyethylene resin: 20 parts; compound A: 53 parts; compound B: 27 parts;

[0067] S2: Heat, melt and knead the mixed materials at a temperature of 180-260°C for 28 mi...

Embodiment 3

[0073] A kind of preparation method of UPE porous film, comprises the following steps:

[0074] S1: Add polyethylene resin to the solvent system composed of compound A and compound B, stir and mix, and mix uniformly to form a mixed material; the polyethylene resin is composed of 75% by mass of ultra-high molecular weight polystyrene with a mass average molecular weight of 4 million. Ethylene and 25 mass % have a mass average molecular weight of 1.2 million and a density of 0.92-0.98 g / cm 3 Composition of high-density polyethylene; bulk density of polyethylene resin 0.24g / cm 3 ; Compound A is a non-solvent for polyethylene resin; Compound B is a solvent for polyethylene resin; Compound A is dimethyl carbonate, and Compound B is decahydronaphthalene;

[0075] The mixed material comprises the following components by weight: polyethylene resin: 16 parts; compound A: 59 parts; compound B: 25 parts;

[0076] S2: Heat, melt and knead the mixed materials at a temperature of 165-250°...

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Abstract

The invention provides a preparation method of a UPE porous membrane. The method comprises the steps that preparing a mixed material firstly, wherein the mixed material comprises polyethylene resin and a solvent system, and the polyethylene resin at least comprises ultra-high molecular weight polyethylene with the mass-average molecular weight being 3 million or above, and the solvent system comprises a non-solvent compound A and a solvent compound B; then heating, melting and mixing the mixed material to form a membrane casting solution, and the viscosity of the membrane casting solution is not more than 10Wcps; extruding the mixture through a die head to form a liquid film; with the reduction of the environment temperature, subjecting the liquid film to split-phase curing to form a green film with a plurality of holes; and then carrying out stretching and other treatment on the raw membrane to obtain the UPE porous membrane with the required membrane structure. The UPE porous membrane can be a symmetric membrane or an asymmetric membrane; wherein, the UPE porous membrane has excellent trapping performance on impurity particles with the particle size of 1-30 nm, is high in interception efficiency, can meet the requirements of practical application, and is suitable for being applied to the field of photoresist.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a preparation method of a UPE porous membrane. Background technique [0002] Separation membrane is a kind of membrane material with selective permeation ability; usually according to the separation mechanism and scope of application, it can be divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane, pervaporation membrane, ion exchange membrane, etc. ; Separation membranes can be made of polymers, metals and ceramics, among which polymers are the majority; polymers currently used to prepare separation membranes mainly include polysulfones, polyamides, polyesters and polyolefins. ; Among them, polyolefin polymers mainly include polyethylene, polypropylene, poly-4-methyl-1-pentene and other olefin substances. The separation membrane has excellent physical and chemical properties, and is cheap and easy to process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/02B01D67/00
CPCB01D71/26B01D69/02B01D67/0002
Inventor 贾建东陈梦泽庞铁生潘哲
Owner HANGZHOU COBETTER TECH CO LTD
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