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Polymer filter membrane with large and small mixed pore diameters as well as preparation method and application of polymer filter membrane

A polymer, pore size technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve problems such as insufficient filtration accuracy, affect inkjet quality, and inability to meet, achieve high mechanical properties, wide application range, large The effect of the water's complete bubble point

Pending Publication Date: 2021-11-26
HANGZHOU COBETTER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the filtration accuracy not high enough when filtering the fluid; especially if the polymer membrane is applied to inkjet applications, the bubble point will be too low due to the excessively large pore size of the polymer membrane. At this time, the ink in the small chamber is easy to enter the large chamber, that is, the so-called "ink back" phenomenon occurs, which greatly affects the inkjet quality and cannot meet the actual needs

Method used

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  • Polymer filter membrane with large and small mixed pore diameters as well as preparation method and application of polymer filter membrane
  • Polymer filter membrane with large and small mixed pore diameters as well as preparation method and application of polymer filter membrane
  • Polymer filter membrane with large and small mixed pore diameters as well as preparation method and application of polymer filter membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Embodiment 1 provides a kind of size mixed pore diameter polymer filter membrane, adopts the following method to prepare: comprise the following steps:

[0113] S1: Prepare a casting solution, which includes the following components by weight: 15 parts of polyethersulfone; 25 parts of butyl lactate; 10 parts of dimethyl sulfoxide; 35 parts of N-ethylpyrrolidone; 3 parts of water; 5 parts of ethanol; 15 parts of hydrophilic additives; the hydrophilic additive is a mixture of glycerin, azodimethyl N-2-hydroxybutylpropionamide and polyvinyl alcohol, and its mass ratio is 3:2:1;

[0114] The temperature of the casting solution is 30°C, and it is cast onto the carrier to form a liquid film;

[0115] S2: Inducing the liquid film to undergo pre-phase separation at an absolute humidity of 32g H 2 Under the humid environment of 0 / kg, the first air flow that flow velocity is 0.6m / s is blown to described liquid film surface simultaneously, and the duration is 50s;

[0116] S3: i...

Embodiment 2

[0119] Embodiment 2 provides a kind of size mixed pore diameter polymer filter membrane, adopts the following method to prepare: comprise the following steps:

[0120] S1: Prepare a casting solution, which includes the following components by weight: 15 parts of polyethersulfone; 25 parts of dimethylformamide; 10 parts of methyl acetate; 35 parts of N-ethylpyrrolidone; 3 parts of water 5 parts of two (ethylene glycol) diethyl ethers; 15 parts of hydrophilic additives; said hydrophilic additives are the mixture of glycerin, azodimethyl N-2-hydroxybutyl propionamide and polyvinyl alcohol, and its mass ratio is 3:2:1;

[0121] The temperature of the casting solution is 30°C, and it is cast onto the carrier to form a liquid film;

[0122] S2: Inducing the liquid film to undergo pre-phase separation at an absolute humidity of 32g H 2 Under the humid environment of 0 / kg, the first air flow that flow velocity is 0.6m / s is blown to described liquid film surface simultaneously, and t...

Embodiment 3

[0126] Embodiment 3 provides a kind of size mixed pore diameter polymer filter membrane, adopts the following method to prepare: comprise the following steps:

[0127] S1: Prepare a casting solution, which includes the following components by weight: 15 parts of polyethersulfone; 25 parts of caprolactam; 10 parts of butyl lactate; 35 parts of N-methylpyrrolidone; 3 parts of water; 5 parts; 15 parts of hydrophilic additives; the hydrophilic additive is a mixture of glycerol, azodimethyl N-2-hydroxybutylpropionamide and polyvinyl alcohol, and its mass ratio is 3:2:1;

[0128] The temperature of the casting solution is 30°C, and it is cast onto the carrier to form a liquid film;

[0129] S2: Inducing the liquid film to undergo pre-phase separation at an absolute humidity of 32g H 2 Under the humid environment of 0 / kg, the first air flow that flow velocity is 0.6m / s is blown to described liquid film surface simultaneously, and the duration is 50s;

[0130] S3: induce complete ph...

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Abstract

The present invention provides a polymer filter membrane with large and small mixed pore diameters. The polymer filter membrane comprises a first microporous skin surface, a second porous surface, and a main body located between the first microporous skin surface and the second porous surface; the main body has a non-directional tortuous pathway; the first microporous skin surface comprises first large pores having a pore size of 10-50 microns, and the pore density is 6-50 holes / 40000mu m < 2 >; the the first microporous skin surface also comprises first small pores having a pore size of 0.5-10 microns, and the density of the first small pores is 6-65 holes / 40000 microns < 2 >. The pore density ratio of the first large pores to the first small pores on the first microporous skin surface is 1: (0.5-2.5); the ratio of the initial water bubble point to the complete water bubble point of the polymer filter membrane is (0.70-0.93): 1. The polymer filter membrane provided by the invention has relatively good circulation amount and relatively high filtering precision; and meanwhile, the polymer filter membrane has a relatively large water complete bubble point and relatively long pressure maintaining time, and is particularly suitable for being applied to the ink jet field and the medical field.

Description

technical field [0001] The invention relates to the technical field of filter membrane materials, and more specifically relates to a polymer filter membrane with mixed pore size and its preparation method and application. Background technique [0002] Polymer filter membrane is a kind of film made of organic high molecular polymer according to a certain process. The membrane mainly plays the role of filtration and separation. With the development of petroleum industry and science and technology, the application field of polymer filter membrane is continuously expanding. At present, the application fields include gas separation, seawater desalination, ultrapure water preparation, sewage treatment, artificial organ manufacturing, medicine, food, Agriculture, chemical industry and other aspects; in addition, according to the different polymers, polymer membranes can also be divided into cellulose polymer membranes, polyamide polymer membranes, polyethersulfone polymer membranes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D69/10B01D67/00
CPCB01D71/68B01D69/02B01D69/10B01D67/0013B01D2325/24
Inventor 贾建东
Owner HANGZHOU COBETTER TECH CO LTD
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