Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing polymer flat sheet microporous membrane

A microporous membrane and polymer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of uneven polymer membrane structure, poor membrane-to-membrane repeatability, and complex membrane-making process. Achieve the effect of avoiding errors, saving time, and simple preparation process

Active Publication Date: 2015-04-08
武汉纺织大学共青城纺织服装产业研究院
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The method of preparing flat microporous membrane by scraping the film with a scraper is not suitable for large-scale production, and has the following disadvantages: (1) The thickness and width of the scraper are determined so that the thickness and area of ​​the polymer film cannot be changed, and different thicknesses and areas must be prepared. The film must be replaced, which makes the film-making process complicated; (2) The traditional scraper scraping film is all manual operation, due to the speed of the hand running, the force of the two hands, and the time the liquid film stays in the air. , different parts of the same film, one film and another film may have great differences in structure and performance. The repeatability between the films is poor; (3) In order to eliminate the casting liquid left on the scraper that will affect the thickness of the next film, the scraper needs to be cleaned after each film is produced, which is a waste of time and a lot of casting liquid

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing polymer flat sheet microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The mass ratios were 18 / 5 / 3 / 74 of polyvinylidene fluoride (PVDF, Shanghai 3F New Materials Co., Ltd., model FR904, number average molecular weight 200000), polyvinylpyrrolidone (PVP), deionized water (H 2 O), N,N-dimethylformamide (DMF) were fully stirred and dissolved in the flask at about 70 ° C for 48h, until the polymer was completely dissolved and filtered, poured into the casting liquid bucket and left to stand for later use. The viscosity of the casting liquid was 64.5 Pa·s. Place a clean glass plate (50cm×50cm) on the spraying table, adjust the position of the spray gun, adjust the air pressure to 0.3MPa, set the operating line speed of the spray gun to 100cm / min, the spray width of 200mm, the reciprocating operation mode and the number of repetitions 3 times. Turn on the diaphragm pump, air compressor and spray gun, and start spraying. When the number of repetitions reaches 3, the spray gun automatically stops and shuts down. Then, the coated glass plate is i...

Embodiment 2

[0025] The mass ratio of polyvinylidene fluoride (PVDF, Shanghai 3F New Materials Co., Ltd., model FR904, number average molecular weight 200000), polyethylene glycol 6000 (PEG6000), N,N-di Methylacetamide (DMAC) was fully stirred and dissolved in the flask at about 70°C for 48h, until the polymer was completely dissolved and filtered, poured into the casting liquid bucket and left to stand for later use. The viscosity of the casting liquid was 9.15Pa·s. Place a clean glass plate (50cm×50cm) on the flat mold, adjust the position of the spray gun, adjust the air pressure to 0.12MPa, set the operating line speed of the spray gun to 70cm / min, the spray width of 200mm, the reciprocating operation mode and the number of repetitions 5 times. Turn on the diaphragm pump, air compressor and spray gun, and start spraying. When the number of repetitions reaches 5, the spray gun automatically stops and shuts down. Then, the coated glass plate is immersed in the solidifying gel to form a ...

Embodiment 3

[0027] Polyvinylidene fluoride (PVDF, Shanghai 3F New Materials Co., Ltd., model FR904, number average molecular weight 200000), polyvinylpyrrolidone ( PVP), 1,2-propanediol (PgOH), N-methylpyrrolidone (NMP) were fully stirred and dissolved in the flask at about 60°C for 48h, until the polymer was completely dissolved and filtered, poured into the casting liquid bucket and left to stand for later use, The viscosity of the casting liquid is 1.3Pa·s. Place the clean polypropylene non-woven fabric (50cm×50cm) on the flat mold, adjust the position of the spray gun, adjust the air pressure to 0.07MPa, set the operating line speed of the spray gun to 50cm / min, the spray width of 100mm, the reciprocating operation mode and the number of repetitions 8 times. Turn on the diaphragm pump, air compressor and spray gun, and start spraying. When the number of repetitions reaches 8, the spray gun automatically stops and shuts down. Then, the coated non-woven fabric is immersed in the soli...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
viscosityaaaaaaaaaa
viscosityaaaaaaaaaa
viscosityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing a polymer flat sheet microporous membrane. The method provided by the invention comprises the steps of preparation of a membrane casting liquid, membrane preparation, and solidification and membrane forming. Firstly, preparing the membrane casting liquid formed by polymer, an additive and an organic solvent, filtering the membrane casting liquid, and conveying the membrane casing liquid to a spray gun via a diaphragm pump; secondly, setting the size of the air pressure and times of round operation of the spray gun under the control of a program; thirdly, under the control of the program to the spray gun, repeatedly spraying the membrane casting liquid on a flat sheet module back and forth; and lastly, placing the flat sheet module coated with the membrane casting liquid in a coagulating bath for gel solidification and membrane forming. The method provided by the invention replaces the common method in which a scraper is adopted to scrape membrane and the membrane casting liquid is spayed on the flat sheet via a principle of nebulization; and the method provided by the invention has the advantages that the membrane-making process is easier, the thickness and the area of the membrane are easier to control, and the evenness and the repeatability of the membrane are good.

Description

technical field [0001] The invention relates to a preparation method of a polymer flat microporous membrane, which belongs to the technology of polymer membrane preparation. Background technique [0002] Membrane technology is a new type of modern high-efficiency separation technology, and it is the product of multidisciplinary crossover. Compared with traditional separation technology, it has outstanding advantages such as high efficiency, low energy consumption, simple process, convenient operation, no pollution to the environment, and easy integration with other technologies. Separation membrane is the starting point and core of membrane separation technology, and it is also the direction and focus of membrane separation technology research and development. The separation membrane materials are mostly polymers, mainly polyamides, cellulose, polyolefins, polysulfones, polyvinylidene fluoride and its fluorine-containing copolymers, polyesters, acrylic copolymers, etc. Por...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/06B01D71/34B01D71/42B01D71/58B01D71/68B01D71/16B01D67/00
Inventor 左丹英李红军易长海甘厚磊彭雄义
Owner 武汉纺织大学共青城纺织服装产业研究院