Preparation method of compound material with super-hydrophilic polyvinylidene fluoride@dopamine@silicon dioxide

Abstract

The invention provides a preparation method of a compound material with super-hydrophilic polyvinylidene fluoride@dopamine@silicon dioxide. The preparation method comprises the following steps of: (1) preparing a polyvinylidene fluoride membrane; (2) preparing a polyvinylidene fluoride@dopamine membrane; (3) preparing the compound material with the super-hydrophilic polyvinylidene fluoride, the dopamine and the silicon dioxide. The compound material prepared by the invention is good in mechanical property and stable in structure, simultaneously has super-hydrophilic property and can be used for emulsion separation.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophilic polyvinylidene fluoride@dopamine@silicon dioxide composite material, which belongs to the technical field of preparation of environmental functional materials. Background technique [0002] With the rapid development of social economy, the continuous progress of industrial and agricultural production, and the gradual improvement of people's living standards, environmental problems have become a major challenge for mankind. Among them, crude oil mining, marine oil spill accidents, and domestic sewage produce a large amount of oily wastewater. worsen the living environment of human beings. According to investigations and studies, about 3.2 billion cubic tons of oil enters water bodies every year to form oily wastewater worldwide. Most of the oil leaked on the water surface easily forms oil-water emulsions or oil films, and floats on the water surface, blocking gas The normal exchange of...

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Problems solved by technology

According to investigations and studies, about 3.2 billion cubic tons of oil enters water bodies every year to form oily wastewater worldwide. Most of the oil leaked on the water surface easily forms oil-water emulsions or oil films, and floats on the water surface, blocking gas The normal exchange of oxygen and carbon dioxide, etc., also hinders the sunlight that can enter the water body, and finally seriously affects the photosynthesis of marine plants; oily substances are also easily attached to rocks and beaches, affecting the ecological environment of the coast , Destroy the ecological value of the coast, and because oil contains a large amount of mutagenic and carcinogenic toxic hydrocarbons, they can be passed through the food chain of aquatic organisms, and ultimately endanger human health

[0003] The commonly used emulsion separation methods include chemical separation method, centrifugation method, high-voltage electric field method, and membrane separation method. Membrane separation technology refers to the process of separating a mixture under a certain mass transfer driving force, which has low energy consumption, high efficiency, Small investment, no pollution, etc., but the membrane is easily polluted during the separation process, and oil droplets and organic matter block the membrane pore size, resulting in reduced membrane flux, low separation efficiency, and secondary pollution.

Due to its unique performance and practical application value, super-hydrophilic materials have attracted widespread attention from the society. They have good self-purification ability in oil-water separation. Usually, materials with rough structures are prepared by spray coating method, electrospinning and other methods. The preparation of multi-scale structured membranes is excellent for oil-water separation, including high permeability, strong oleophobicity, and repeated use, but the method of using these carefully tailored nanostructures is a challenge for large-scale preparation of membranes. Therefore, it is of great significance to find simple, easy-to-regulate and widely applicable methods

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