A thermoplastic pervaporation polymer film and its preparation method and application

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...

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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

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