Wear-resistant food-grade super-hydrophobic nano-coating without adhesion to yoghourt

Abstract

The invention discloses a wear-resistant food-grade super-hydrophobic nano-coating without adhesion to yoghourt. The invention aims to disclose the wear-resistant food-grade super-hydrophobic nano-coating without adhesion to yoghourt. The coating that coats a composite PE film or a composite EVA film in a roller coating manner has super-hydrophobic property, good hardness, strength, wear resistance, good heat sealability, no powder falling, no adhesion to yoghourt and the like, and is particularly suitable for the current food packaging industry without equipment modification, and the aim of the invention can be fulfilled by adopting conventional roller coating equipment for construction. According to a technical scheme in the invention, the coating comprises a bottom coating and a surfacecoating. The bottom coating comprises the following components in parts by weight: 4-12 parts of heat-sealing resin of modified ethylene-vinyl acetate copolymer resin, 2-12 parts of organic polysilazane resin, 0.5-4 parts of a hydrogenated styrene-butadiene segmented copolymer elastomer, 1-2 parts of chlorinated polypropylene resin, 5-15 parts of modified nanoparticles, 2.5-7.5 parts of zinc oxide whiskers, 0.25-1 part of a catalyst and 50-80 parts of a mixed organic solvent. The surface coating comprises the following components in parts by weight: 5-10 parts of a low-surface-energy substance and 90-95 parts of ethanol.

Description

technical field [0001] The invention discloses a wear-resistant super-hydrophobic nano-coating, in particular to a food-grade nano-coating used for yoghurt covering films without sticking to yoghurt, and belongs to the technical field of food-grade coatings. Background technique [0002] With the progress of society and the improvement of people's living standards, yogurt has become an indispensable healthy drink in daily life. [0003] Yogurt was once hailed as "the greatest food in human history", and it also cured anorexia in millions of children around the world at the end of the 20th century. Usually yogurt is filled in a plastic cup, and the lid is sealed with an aluminum foil composite film. Due to the high viscosity of yogurt, it is easy to be adsorbed on the cup wall and lid, so many people will habitually lick the yogurt lid after drinking yogurt. It is unhygienic and unsightly. And throwing away is both a pity and a waste. Therefore, the market is in urgent need...

AI Technical Summary

Problems solved by technology

However, the invention patent does not disclose how long it takes to cure the coating on the aluminum foil composite film, whether it will affect the heat sealing performance of the subsequent aluminum foil composite film and cup lid

At the same time, the highest hydrophobic angle of the coating described in the invention patent is a single coating of 135°. Such a low hydrophobic angle is very difficult for non-stick yogurt, and does not have much practical value. Similarly, the patent describes The special latex coating for non-stick lids does not mention whether it will affect the heat sealing performance

[0007] Traditional super-hydrophobic and super-oleophobic methods generally use a dual-structure coating system composed of a base coat and a top coat. The top coat is easily scraped off or peeled off in powder form, thus losing the superhydrophobic and superoleophobic properties, and powder falling has always been an important reason why superhydrophobic and superoleophobic coatings are difficult to promote in large areas, especially when roller coating is used. On the airtight lid of yogurt, if there is powder falling, it will be very difficult for the end user to accept

Images