Super-infiltration metal net film and preparation method and application thereof

Abstract

The invention discloses a super-infiltration metal net film and a preparation method and application thereof, and belongs to the field of novel environment-friendly materials. The prepared super-infiltration metal net film is coated with a super-hydrophilic coating, the flatness and compactness of the net film are improved through chain type or bead type nanometer silica sol in the formula of the coating, and nanocrystalline cellulose and other natural organic compounds which are extremely high in hydrophilicity and economical and wide in source are added to enhance the hydrophilicity of the net film; meanwhile, the water-based acrylic resin with a relatively low swelling degree in water and other water-based resin with relatively good hydrophilicity are used for cross-linking and curing, so that the water resistance of the net film is improved; the prepared super-hydrophilic filter element structurally comprises a stainless steel framework, a super-infiltration metal net film, an end cover and a sealing ring from inside to outside in sequence, has the characteristics of good hydrophilicity, strong pollution resistance, excellent water soaking resistance and the like, and can be used for efficiently separating an oil-water mixture.

Description

technical field [0001] The invention relates to the technical field of new environmental protection materials, in particular to a super-wetting metal mesh and its preparation method and application. Background technique [0002] Due to the different wettability of the surface to water and oil, superhydrophilic / oleophobic membranes have received extensive attention in the field of oily wastewater treatment. Superhydrophilic / oleophobic surfaces can exist in two ways: superhydrophilic / oleophobic in air and superhydrophilic / oleophobic underwater. Among them, superhydrophilic / oleophobic materials in air need to achieve the effect of oleophobic in air. The special and complex micro-nano rough structure and chemical groups are difficult to produce and apply on a large scale; while the structure of super-hydrophilic / hydrophobic materials is relatively economical, and only requires pre-wetting the surface with water to form a hydration layer before use. In recent years, with the c...

AI Technical Summary

Problems solved by technology

The traditional method of preparing this kind of omentum is mainly to carry out simple chemical etching or roughening on the omentum. The obtained omentum is difficult to maintain its wettability for a long time during service, and the service life is extremely short. A large amount of waste liquid needs subsequent treatment, and the super-wetting coating coated metal mesh method is widely used because of its good modification effect, simple process, and long life of the mesh.

However, due to the inherent lipophilicity in the air of the superhydrophilic underwater oleophobic coating itself, it is very easy to adhere to the oil in the sewage during the working process, resulting in the loss of hydrophilicity, which affects the separation efficiency and communication of the omentum. In severe cases, it will directly lead to the failure of the omentum, which will bring great environmental risks and economic losses

But at present, there is still no effective solution to the problem of long-term oil pollution prevention of superhydrophilic underwater oleophobic membranes in the field.

At the same time, since the superhydrophilic underwater oleophobic membrane needs to be pre-wetted before use to ensure the formation of a hydration layer, from the perspective of cost and construction difficulty, the industry often soaks the membrane in water for a long time to maintain hydration for a long time Therefore, extremely high requirements are placed on the blister resistance of the coating. However, there are very few work results related to this performance index in the field, and it is impossible to provide specific reference and guidance for technical personnel in the industry.

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