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A thermoplastic pervaporation polymer film and its preparation method and application

A thermoplastic polymer and polymer membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, permeation/dialysis water/sewage treatment, etc., can solve the problems of membrane performance limitation, volatilization speed control, uneven dispersion, etc., to achieve The cost of raw materials is low, the effect of realizing the production process and high separation performance

Active Publication Date: 2022-07-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the separation performance of its pure membrane has not been greatly improved. Although the performance of its mixed matrix membrane is already at the forefront of the industry, in the actual production process, if the membrane production method of the pure membrane is improved, it is found that its separation performance is not good. High key, and can be applied to industrialization, it can save costs to a great extent
[0010] There are many ways to prepare PEBA, mainly solvent dissolution and direct melting, but the method of direct melting (CN 101296991A) is not suitable for doping substances that are not resistant to high temperatures in the future, and will cause uneven dispersion
There are many ways to dissolve with a solvent, and there is a choice to volatilize the solvent at room temperature (CN 108097070B). In the preparation process, it is only applicable to some PEBA models and does not have certain universality; there are also PEBA preparation methods that are all It is cast on a glass plate or a PTFE plate (CN 103406034B, CN 103100313A, CN 103506017A), but there is no mention of the limitation on the volatilization rate, and the temperature during drying is increased
In addition to PEBA, there is also polyurethane as a thermoplastic material that can also be used for the separation of phenol / water (CN 102743982B), but volatilization after curing is not considered in this preparation process. Whether the polymer film itself has been agglomerated during this process, Therefore, after the solvent evaporates, there is a certain aggregation of the polymer, which causes the defect of the film
[0011] In the existing research, the performance of the membrane is limited, that is, the trade-off effect is more obvious
Because the current research on the separation of phenolic organic matter / water is mostly thermoplastic materials, and the existing film-making methods are relatively diverse, but generally they are directly coated on glass plates, and the volatilization rate is not controlled, so it is prepared. The performance of the membrane is also mixed

Method used

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  • A thermoplastic pervaporation polymer film and its preparation method and application
  • A thermoplastic pervaporation polymer film and its preparation method and application
  • A thermoplastic pervaporation polymer film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The PEBA1074 (purchased from Arkema) was put into a vacuum drying oven for drying. Take 1g of dried PEBA1074 polymer particles, put it in 19g of prepared solvent (the solvent is prepared by n-amyl alcohol and n-butanol in a mass ratio of 1:3), and put it in a constant temperature oil bath at 110°C at medium and high speed. Stir at the stirring speed for about 4-8 hours to ensure that it is completely dissolved and dispersed. After dispersing, let it stand for 1 hour in an oil bath at 95°C to complete defoaming.

[0041] Select three teflon Petri dishes and heat to above 80 °C. Pour the dissolved and defoamed casting solution into a petri dish while it is still hot, and then place the petri dish in a container with two sides open, and then place the whole device in a horizontal blast drying oven, and respectively at a certain speed. Inert gas purging at 105°C (initially, the solvent in the film casting liquid volatilizes and quickly reaches a saturated state in the clo...

Embodiment 2

[0046] The PEBA1074 (purchased from Arkema) was put into a vacuum drying oven for drying. Take 1g of dried PEBA1074 polymer particles, put it in 19g of prepared solvent (the solvent is prepared by n-amyl alcohol and n-butanol in a mass ratio of 1:1), and put it in a constant temperature oil bath at 110°C at medium and high speed. Stir at the stirring speed for about 4-8 hours to ensure that it is completely dissolved and dispersed. After dispersing, let stand for 1 h in an oil bath at 100 °C to complete deaeration.

[0047] Choose a teflon petri dish and heat to above 80 °C. Pour the dissolved and defoamed casting solution into a petri dish while it is still hot, then place the petri dish in a container with two sides open, and finally place it in a completely horizontal blast drying oven for drying, and add 2.5 mL / mL Inert gas purging at 105 °C for min (initially, the solvent in the casting solution volatilizes and quickly reaches saturation in the closed container, so that...

Embodiment 3

[0052] The PEBA1074 (purchased from Arkema) was put into a vacuum drying oven for drying. Take 1g of dried PEBA1074 polymer particles, put it in 19g of prepared solvent (the solvent is prepared by n-amyl alcohol and n-butanol in a mass ratio of 2:3), and put it in a constant temperature oil bath at 110°C at medium and high speed. Stir at the stirring speed for about 4-8 hours to ensure that it is completely dissolved and dispersed. After dispersing, let stand for 1 h in an oil bath at 100 °C to complete deaeration.

[0053] Choose a teflon Petri dish and heat to around 80°C. Pour the dissolved and defoamed casting solution into a petri dish while it is still hot, then place the petri dish in a container with two sides open, and finally place it in a completely horizontal blast drying oven for drying, and add 2.5 mL / mL Inert gas purging at 105 °C for min (initially, the solvent in the casting solution volatilizes and quickly reaches saturation in the closed container, so that...

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Abstract

The invention provides a preparation method for separating phenolic organic matter / water thermoplastic pervaporation polymer membrane. Through the synergistic effect of solvent ratio, temperature and solvent volatilization rate, the curing rate of thermoplastic materials is regulated, and pervaporation polymer films with excellent film-forming properties are prepared. The pervaporation polymer membrane prepared by the method has outstanding separation performance in removing phenolic organic matter in water, and its flux and separation factor are superior to the similar separation membranes prepared by the traditional method. The method can better retain the intrinsic properties of the membrane material and maximize the performance of the separation membrane.

Description

technical field [0001] The invention relates to a thermoplastic pervaporation polymer film and a preparation method and application thereof, belonging to the field of polymer film preparation technology, environmental protection technology, and membrane application, and in particular to the field of water treatment of phenolic organic matter / water. Background technique [0002] Phenolic organics are common organic pollutants in various wastewaters discharged from industries such as textiles, pharmaceuticals, rubber, plastics, wood processing, petrochemicals, cosmetics and coal tar production. However, due to its strong toxicity to animals and plants in the water body, and the possibility that it may eventually affect human beings along with the food chain, as early as 1985, the US National Environmental Protection Agency added phenolic organic compounds to the blacklist of priority control pollutants. In my country, the treatment requirements for phenolic pollutants are also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/06B01D69/02B01D67/00B01D61/36C02F1/44C02F101/30
CPCB01D71/06B01D69/02B01D67/0011B01D67/0013B01D67/0002B01D61/362C02F1/448C02F2101/30
Inventor 周浩力冒顾政金万勤
Owner NANJING TECH UNIV
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