A preparation method for a coating that is safe, non-toxic and anti-adhesive to liquid food

Abstract

The invention discloses a method for preparing a coating for safe, non-toxic and anti-adhesion liquid food, and relates to the related field of coating preparation. By improving the materials used, it is safe and non-toxic, and the anti-adhesion material is suitable and effective. The layer is more stable, and the equipment used in the preparation process is common, the operation is simple, and the preparation process takes less time. Including the following materials: liquid A, polyvinyl alcohol 15g, deionized water 85ml, citric acid monohydrate 12.5ml and hydrophobic nano-silica 1.25g; liquid B, palm wax 4g, ethyl acetate 100ml and hydrophobic nano-silica 2g ;Food-grade coated paper; Dissolve polyvinyl alcohol in deionized water; Add monohydrate citric acid solution, heat up, stir for esterification; Add hydrophobic nano-silica, stir and disperse to obtain liquid A; Add palm wax to acetic acid In ethyl ester, stir until the wax dissolves, and let it stand at room temperature; add hydrophobic nano-silica, and ultrasonically treat it to obtain liquid B; mix, stir, and ultrasonically disperse liquid A and liquid B to obtain a coating liquid.

Description

technical field [0001] The invention relates to the related field of coating preparation, in particular to a method for preparing a safe, non-toxic and anti-sticking liquid food coating. Background technique [0002] The coating preparation of anti-sticking liquid food is based on the surface wetting theory. The surface wetting theory was modified from the original Young's equation to the Wenzel complete wetting model, and finally developed into the Cassie-Baxter model as a theory for judging the hydrophobicity of the material surface. When the static contact angle between the surface and water is greater than 90°, it is a hydrophobic surface; when the static contact angle between the surface and water is greater than 150°, and the rolling angle is less than 10°, it is a superhydrophobic surface. At present, the two main methods for constructing hydrophobic surfaces are constructing rough surface structures and modifying substances with low surface energy on the surface; me...

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Problems solved by technology

[0005] Constrained by safety, in terms of food packaging, long-chain fluorocarbon materials and various toxic organic substances cannot be used in the preparation process. Even if toxic organic solvents do not participate in the formation of coatings, it is difficult to ensure absolutely no residue during the preparation process. It poses a potential threat to human safety; in addition, the cracking and stability problems of solid coatings with limited adhesiveness after long-term air drying also limit the wide application of coatings; due to the long molding cycle of traditional hydrophobic surface preparation methods , inconvenient to use in a large area, complex methods and high precision requirements for reagent purity instruments, it is difficult to be practically applied in industrial production; therefore, the market urgently needs to develop a coating that is safe, non-toxic and anti-adhesive to liquid food. ways to help people solve existing problems

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