Preparation method of composite modified polyvinylidene fluoride and film thereof

Abstract

The invention discloses a preparation method of composite modified polyvinylidene fluoride, comprising the following steps: mixing TiO2 and g-C3N4 according to a certain mass ratio, and grinding to prepare mixed powder; adding a certain amount of PFG into DMF, carrying out magnetic stirring for a period of time to prepare mixed liquor; adding a certain amount of PVDF and several silane coupling agents into the above mixed liquor, and stirring to prepare a base solution; adding the mixed powder prepared in the step S1 into the above prepared base solution according to a certain mass ratio, and uniformly stirring to prepare the composite modified polyvinylidene fluoride; and uniformly smearing the prepared composite modified polyvinylidene fluoride onto a film plate and cooling to prepare the polyvinylidene fluoride composite film. Through the TiO2 and g-C3N4 composite particles and under the circumstance of not changing the original structure of PVDF but maintaining original properties of PVDF, tensile strength and hydrophilicity of the PVDF film are effectively modified.

Description

technical field [0001] The invention relates to a modified polyvinylidene fluoride, in particular to a method for preparing a composite modified polyvinylidene fluoride and a film thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is made of monomer F 2 C=CH 2 The polymer produced by the polymerization reaction is a white powder crystal structure polymer with a molecular weight of about 400,000-600,000 and a density of 1.75-1.78g / cm 3 between. It has good chemical stability, can work in harsh environments such as acid and alkali, has a certain degree of heat resistance, and has the ability to resist part of ultraviolet radiation. Therefore, polyvinylidene fluoride (PVDF) materials have good application prospects and certain development space. [0003] Polyvinylidene fluoride is made into a membrane, which can be used as a reaction membrane for membrane separation technology in seawater desalination, pure water preparation, separation and purification i...

AI Technical Summary

Problems solved by technology

[0010] At present, most of the research on the modification of polyvinylidene fluoride (PVDF) membrane is to add a single inorganic particle, and there is no research on the modification of polyvinylidene fluoride (PVDF) by using organic particles and inorganic ions as composite particles.

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