Method of producing aromatic polymer antifouling film

Abstract

The invention discloses a method of producing an aromatic polymer antifouling film. The method introduces a halomethyl group onto a surface of a polymer through phase transfer catalysis in a water phase, and further modifies the surface of the aromatic film material by using an atomic transfer free radical living polymerization method for grafting antifouling groups. The halomethylation only occurs at the surface of the film, the reagent consumption is greatly reduced, a traditional halomethylation reaction on the polymer body by using an organic solvent is avoided, and the problem of recycling the organic solvent is excluded, thereby reducing costs, and lowering the chances of polluting the environment. A phase transfer catalyst is an environment-friendly stable organic compound, can be recycled, and is better than traditional SnCl4 and other Lewis acid catalysts that are water sensitive and hard to recycle. The method provided by the invention can conduct halomethylation and graft polymerization on a surface of any polymer with an aromatic structure, has wide practicality, and is suitable for industrialization.

Description

technical field [0001] The invention belongs to the field of organic polymer materials, and in particular relates to a preparation method of an aromatic polymer antifouling film. Background technique [0002] Aromatic polymer materials are a class of high-performance polymers with heat resistance and stable mechanical properties. They are widely used in water treatment, food industry, medicine and medical treatment, desalination and other fields. For example, aromatic polysulfone and polyamide membrane materials can be used in the preparation of ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes and forward osmosis membranes for water treatment. The introduction of functional groups on the surface of the membrane, and then grafting with anti-fouling and hydrophilic polymer materials can effectively reduce the problem of membrane fouling and improve the performance and efficiency of the membrane. For medical devices, according to statistics, more ...

AI Technical Summary

Problems solved by technology

[0004] figure 1 The disadvantages of the traditional method are: (1) The reaction belongs to the modification of the polymer body to generate a new polymer containing halomethyl groups in the main chain repeating unit, which consumes a large amount of chloromethyl reagents, and the material has already occurred Qualitative change, the recovery of toxic and volatile solvents used to dissolve polymers is difficult; (2) the catalyst SnCl used 4 Toxic and easy to hydrolyze, SnO generated by hydrolysis in the post-treatment stage 2 It is difficult to remove from the polymer, the catalyst cannot be recycled and reused, and it is easy to cause environmental pollution; (3) The reagent trimethylchlorosilane used is expensive and easy to hydrolyze; (4) The reaction is sensitive to water, so the amount of catalyst and halogenated reagent required Large, to avoid reaction failure due to failure of catalyst and halogenated reagent; (5) press figure 1 As shown in the traditional process method, only the surface halomethyl group of the material participates in the reaction of the surface grafting of the halomethyl polymer, and the halomethyl group inside the material does not participate in graft polymerization, so the halomethyl group contained inside the material does not Unnecessary to generate

6) For example according to literature Journal of Membrane Science 446 (2013) 79–91 reported the results of polysulfone membranes, using figure 1 The preparation of chloromethylated polymer cast membranes led to a significant decrease in protein retention rate, indicating that the pore size of membranes prepared by new polymers became larger. This method used too many toxic reagents for membrane production, which made this scheme unsuitable for the preparation of biological, medical and food grade membrane material

7) For some polymers, such as some polyimide varieties, they can only be dissolved in phenolic solvents, because phenolic compounds are more prone to halomethylation, so figure 1 The method is not applicable to this type of aromatic polymer materials

Images