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Food-contactable super-hydrophobic coating and preparation method thereof

A super-hydrophobic coating and food technology, applied in coatings, shellac coatings, devices for coating liquids on surfaces, etc., can solve problems such as complex and time-consuming processes, environmental pollution, and unsuitable for food contact, and achieve technological progress Simple, small sliding angle, and the effect of preventing liquid food from sticking

Active Publication Date: 2021-09-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a food-contactable super-hydrophobic coating and a preparation method thereof that are safe and non-toxic in raw materials, have good bonding properties with substrates, have good hydrophobic and anti-adhesive effects, and can prevent liquid food from adhering. Not suitable for food contact use, complex and time-consuming process, and environmental pollution caused by the preparation process

Method used

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  • Food-contactable super-hydrophobic coating and preparation method thereof
  • Food-contactable super-hydrophobic coating and preparation method thereof
  • Food-contactable super-hydrophobic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 4.5g of shellac, add it to 91g of absolute ethanol, carry out magnetic stirring at room temperature for 15 minutes, filter out ethanol insoluble matter, add 1.5g of ethyl cellulose, continue magnetic stirring for 5 minutes, raise the temperature to 70°C, and then add 3g of stearic acid was stirred magnetically for 5 minutes to obtain a coating mixture (wherein the mass concentration of stearic acid was 3 wt%, that of shellac was 4.5 wt%, and that of ethyl cellulose was 1.5 wt%). At 6mL / 100cm 2 The amount of impregnation coated glass plate, placed in 60 ℃ and dried for 10min to obtain food contact super-hydrophobic coating.

[0037] The resulting coating had a contact angle of 151.9° and a sliding angle of 7°. The adhesion level of the fork method is 4A.

Embodiment 2

[0039] Take 4g of shellac, add 92g of absolute ethanol, stir magnetically at room temperature for 15min, filter out ethanol insolubles, add 1g of ethyl cellulose, continue magnetically stirring for 5min, raise the temperature to 70°C, then add 3g of hard shellac Fatty acid, magnetically stirred for 5 minutes to obtain a coating mixture (wherein, the mass concentration of stearic acid is 3wt%, the mass concentration of shellac is 4wt%, and the mass concentration of ethyl cellulose is 1wt%). At 6mL / 100cm 2 The amount of impregnation coated glass plate, placed at 50 ℃ and dried for 20min to obtain a food contact super-hydrophobic coating.

[0040] The resulting coating had a contact angle of 153.1° and a sliding angle of 6°. The adhesion level of the fork method is 4A.

Embodiment 3

[0042] Choose one of water-based polyurethane, EVA emulsion, and gum arabic as the bonding matrix.

[0043] Take 4g of bonding matrix, add 92g of absolute ethanol, stir magnetically at room temperature for 15min, filter out ethanol insoluble matter, add 1g of ethyl cellulose, continue magnetically stirring for 5min, raise the temperature to 70°C, and then add 3g of stearic acid, and magnetically stirred for 5 minutes to obtain a coating mixture. At 6mL / 100cm 2 The amount of impregnation coated glass plate, placed at 50 ℃ and dried for 20min to obtain a food contact super-hydrophobic coating.

[0044] The properties of the prepared food-contact superhydrophobic coating are shown in Table 1.

[0045] Table 1 Performance comparison table of different bonding matrices

[0046] bonding matrix Waterborne Polyurethane EVA emulsion gum arabic Contact angle / ° 110 104 91 Sliding angle / ° 63 67 79 Adhesion grade / A 1A 3A 2A

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Abstract

The invention relates to a food-contactable super-hydrophobic coating and a preparation method thereof, and belongs to the technical field of preparation of super-hydrophobic materials, and the super-hydrophobic coating mainly comprises the following raw materials: stearic acid, shellac and ethyl cellulose. The preparation method comprises the following steps: stirring and dissolving the shellac in absolute ethyl alcohol, adding the ethyl cellulose and the stearic acid to prepare a mixed solution, dipping a coating base material in the mixed solution, and forming the coating at a certain temperature. The raw materials used for preparing the super-hydrophobic coating are non-toxic and pollution-free, the super-hydrophobic coating can be used as a material for food contact, the process is simple, the binding property of the coating and a base material is good, the super-hydrophobic coating can be prepared on various base materials to endow the base materials with super-hydrophobicity, and the effect of preventing liquid food adhesion is achieved.

Description

technical field [0001] The invention relates to a food-contactable superhydrophobic coating and a preparation method thereof, belonging to the technical field of superhydrophobic material preparation. Background technique [0002] Common liquid foods that consume a lot, such as yogurt, tomato sauce, seasoning, etc., tend to adhere to the inner wall of the packaging container, making the product unable to be completely emptied, resulting in a large amount of food waste, increasing the difficulty of packaging recycling, and affecting consumer experience. The preparation of superhydrophobic coatings on the inner surface of packaging materials to make liquid food flow out of the packaging is an effective way to achieve anti-stick properties. However, the low surface energy materials commonly used at present, such as fluoride, organosilane, etc., and nanomaterials such as zinc dioxide and titanium dioxide are expensive, have safety risks, and cannot meet the requirements for food...

Claims

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Application Information

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IPC IPC(8): C09D193/02C09D101/28C09D7/63B05D7/24B05D7/04B05D7/14B05D5/00
CPCC09D193/02C09D101/28C09D7/63B05D7/24B05D7/04B05D7/14B05D5/00B05D2203/35B05D2203/22B05D2202/25B05D2252/00C08L1/28C08K5/09C08L93/02
Inventor 唐亚丽刘灵雪
Owner JIANGNAN UNIV
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