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Polyethersulfone/polyvinylidene fluoride blend membrane with support layer and preparation method thereof

A polyvinylidene fluoride and polyether sulfone technology, which is applied in the field of blended membranes and their preparation, can solve the problems of limited application fields, poor resistance to strong acids and bases, and poor membrane strength, and achieves firm bonding and excellent chemical stability. , the effect of strengthening the film strength

Active Publication Date: 2017-12-29
上海一鸣过滤技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyethersulfone is an excellent membrane material with high pressure resistance, heat resistance and oxidation resistance, good chemical stability and biocompatibility. In recent years, it has been more and more widely used in sewage treatment and hemodialysis etc., but the polyethersulfone membrane also has some disadvantages: after long-term use and frequent cleaning, the membrane strength is obviously deteriorated and the service life is shortened; in addition, polyethersulfone, a polymer material, is resistant to strong acids and alkalis Poor, it cannot be used in this type of water treatment, which limits the application field of this type of membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the following ingredients and compositions: PES: 16%; PVDF: 1.1%; PEG400: 30%; PVP: 1%; DMAC: 52.9%. Put the above raw materials into the dissolver, and fully stir at a temperature of 40° C. to obtain a casting solution. Filter the casting solution, defoam and let stand for 24 hours before use. Immerse the charged polyester non-woven fabric in the casting solution, pull out the non-woven fabric at a uniform speed after passing through the scraper, the gap between the scraper and the non-woven fabric is 30 microns, pre-evaporate for 120s (steam temperature 40°C), and immerse in the coagulation bath , and finally washed and dried to form a film.

[0022] Using pure water at 25°C as the test medium, the first bubble point pressure is 0.12MPa, and the pure water flux is 16ml / cm 2 ·min(ΔP=0.02MPa, the diaphragm area is 20cm 2 ).

Embodiment 2

[0024] According to the following ingredients and compositions: PES: 16%; PVDF: 4%; PEG400: 20%; PVP: 1%; DMAC: 59%. Put the above raw materials into the dissolver, and fully stir at a temperature of 40° C. to obtain a casting solution. Filter the casting solution, defoam and let stand for 24 hours before use. Immerse the charged polyester non-woven fabric in the casting solution, pull out the non-woven fabric at a uniform speed after passing through the scraper, the gap between the scraper and the non-woven fabric is 30 microns, pre-evaporate for 120s (steam temperature 40°C), and immerse in the coagulation bath , and finally washed and dried to form a film.

[0025] Using pure water at 25°C as the test medium, the first bubble point pressure is 0.18MPa, and the pure water flux is 12ml / cm 2 ·min(ΔP=0.02MPa, the diaphragm area is 20cm 2 ).

Embodiment 3

[0027] Formulated according to the following components and compositions: PES: 24%; PVDF: 3%; PEG400: 20%; DMAC: 53%. Put the above raw materials into the dissolver, and fully stir at a temperature of 60° C. to obtain a casting solution. Filter the casting solution, defoam and let stand for 24 hours before use. Immerse the charged polyester non-woven fabric in the casting solution, pull out the non-woven fabric at a uniform speed after passing through the scraper, the gap between the scraper and the non-woven fabric is 40 microns, pre-evaporate for 300s (steam temperature 45°C), and immerse in the coagulation bath , and finally washed and dried to form a film.

[0028] Use pure water at 25°C as the test medium, the first bubble point pressure is 0.45MPa, and the pure water flux is 4ml / cm 2 ·min(ΔP=0.02MPa, the diaphragm area is 20cm 2 ).

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Abstract

The invention relates to a polyethersulfone / polyvinylidene fluoride blend film with a support layer and a preparation method thereof. Firstly, the polyester non-woven fabric is charged to obtain a charged non-woven fabric as a support layer; Ether sulfone and polyvinylidene fluoride are dissolved in a solvent, and additives are added, and at 30-70°C, fully stirred to form a uniform and stable casting solution; the casting solution is cast on the support layer, and the casting solution is soaked The support layer is scraped with a scraper, and after pre-evaporation, it enters the coagulation bath to form a film. After the film is formed, it is fully rinsed with pure water to remove the solvent remaining in the film, and then dried by a high-temperature drum to obtain a finished film. Compared with the prior art, the supporting layer used in the present invention is a treated charged polyester non-woven fabric, which is more firmly combined with the casting solution, and the prepared film has high strength; the addition of polyvinylidene fluoride makes polyether The chemical stability of the sulfone membrane is better, and the resistance to strong acid and strong alkali is improved.

Description

technical field [0001] The invention relates to a blend membrane and a preparation method thereof, in particular to a polyethersulfone / polyvinylidene fluoride blend membrane with a support layer and a preparation method thereof. Background technique [0002] As a new separation, purification and concentration separation method, membrane separation technology has the advantages of simple process, high efficiency, low energy consumption and small footprint compared with traditional separation technologies (precipitation, evaporation, extraction, coagulation and ion exchange, etc.) , so it develops very fast in sewage treatment, food and beverage production, pharmaceutical synthesis, energy, and chemical production. Polyethersulfone is an excellent membrane material with high pressure resistance, heat resistance and oxidation resistance, good chemical stability and biocompatibility. In recent years, it has been more and more widely used in sewage treatment and hemodialysis etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/10B01D67/00
Inventor 杨刘王鑫龚志宏
Owner 上海一鸣过滤技术有限公司