Preparation method and application of high-adhesion hydrogel coating

Abstract

The invention discloses a preparation method and application of a high-adhesion hydrogel coating, which comprises the following steps: adding a hydroxyl-containing high-molecular polymer and an assistant into water, stirring the solution, heating and dissolving the component, coating the surface of a hydroxyl-rich substrate with the solution, drying the coating to form a film, and swelling the coating in an aqueous environment to obtain the high-adhesion hydrogel coating. The hydroxyl-containing high-molecular polymer is selected from one or more of chitosan, polyvinyl alcohol, starch, carrageenan or alginic acid; the auxiliary agent is one or more of small molecules or inorganic nanoparticles such as glacial acetic acid, glycerol, propylene glycol, hydrochloric acid, ethylene glycol, sorbitol and graphene oxide; the aqueous environment is pure water, an aqueous solution of inorganic salt or an aqueous solution of organic matters. The hydrogel coating can have efficient cohesiveness with various substrates rich in hydroxyl, the adhesion energy of the substrates can reach 3000 J / m2, the tensile breaking strength of the hydrogel can reach 10 MPa, and the hydrogel coating has great application prospects in marine antifouling, drag reduction and biomedical aspects.

Description

technical field [0001] The invention relates to the technical field of hydrogel coatings, in particular to a preparation method and application of a highly adhesive hydrogel coating. Background technique [0002] Hydrogel is a kind of soft material with polymer three-dimensional space network structure and water as the dispersion medium. With polymer as its network matrix, the hydrogel is similar to a solid in shape and can maintain a certain physical shape, and the diffusion or penetration of the aqueous medium makes the hydrogel have both the functions and behaviors of a liquid, and its unique composition and structure The hydrogel has both solid and liquid properties, so it is widely used in tissue engineering, drug delivery, antifouling coating, ship drag reduction and other application fields. [0003] Due to the high hydrophilic surface of the hydrogel, the polymer chain density in the material is low, resulting in poor adhesion between the hydrogel and the substrate ...

AI Technical Summary

Problems solved by technology

Although this method of bonding hydrogels and hard substrates is suitable for general solid substrates and does not require the substrate to be porous, it still requires pretreatment of the solid surface

Economically, the preparation of silane coupling agents is difficult, resulting in high prices, which are only suitable for laboratories and are not suitable for large-scale industrial applications.

Patent CN 104861755A discloses a method for preparing a hydrogel antifouling coating, in which hydrogel solid powder is mixed with epoxy resin to achieve hydrogel bonding, but this method will cause the hydrogel to swell and Epoxy separates and does not adhere effectively to the substrate material

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