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Fluoride-free waterproof oil-proof food-grade coating and preparation method thereof

A fluorine-free waterproof, food-grade technology, used in paper coatings, coatings, adding water repellents, etc., can solve the problems of difficult recycling of coated paper, limited application range, strong bioaccumulation, etc., to improve efficiency and gloss. Good, good heat resistance effect

Active Publication Date: 2020-08-25
ZHONGSHAN TIAN JIA PAPER PROD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Although the waterproof and oil-repellent effect is excellent, such waterproof and oil-repellent agents are usually polymers containing perfluoroalkyl groups, which have the defects of strong bioaccumulation and refractory degradation. Strong toxicity, and the coated paper is difficult to recycle, easy to pollute the environment, and the application range is extremely limited

Method used

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  • Fluoride-free waterproof oil-proof food-grade coating and preparation method thereof

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preparation example Construction

[0033] Such as figure 1 Shown, the preparation method of fluorine-free waterproof and oil-proof food-grade coating of the present invention, comprises the following steps:

[0034] S100. Take an appropriate amount of emulsifier and add it to deionized water, and heat to prepare a mixed solution; where the temperature is raised to 90°C.

[0035] S200. Add palm wax to the mixed solution, continue to heat up and emulsify with high-speed stirring to obtain an emulsion; heat up to 100°C-120°C (the optimal solution is to heat the emulsion to boiling), and the stirring speed is 1500r / min-2000r / min min, the emulsification time is 30min-45min.

[0036] S300. Heating the emulsion and slowly adding modified polyvinyl alcohol into the emulsion. After the modified polyvinyl alcohol is completely dissolved, add glycerin and stir evenly; the stirring time is 1 h.

[0037] S400. Add the compounded water-based polymer resin to the emulsion and stir to obtain a fluorine-free waterproof and oi...

Embodiment 1

[0041] a. Take 1.5g of emulsifier and add 64.7g of deionized water, and heat up to 90°C to obtain a mixed solution;

[0042] b. Add 5.0 g of palm wax to the mixed solution obtained in step a, continue heating to 105° C., and emulsify at a high speed of 1500 r / min for 30 min;

[0043] c. Warm up the emulsified emulsion in step b to 95°C, then slowly add 3.0 g of modified polyvinyl alcohol to the emulsion, after it is completely dissolved, add 0.8 g of glycerin, and stir for 1 hour until the reaction is complete;

[0044] d. After the emulsion in step c is cooled to room temperature, add 25 g of water-based polyurethane resin and polyacrylate composite resin to the emulsion, and stir at room temperature for 15 minutes to obtain a fluorine-free waterproof and oil-proof food-grade coating.

[0045] The fluorine-free waterproof and oil-proof food-grade paint prepared in Example 1 is coated on food-grade white cardboard, and the coating amount is 6g / m 2 , bake at 60°C for 5min. Th...

Embodiment 2

[0047] a. Take 2.0g of emulsifier and add 59g of deionized water, and heat up to 90°C to obtain a mixed solution;

[0048] b. Add 7.0 g of palm wax to the mixed solution obtained in step a, continue heating to 105° C., and emulsify at a high speed of 1500 r / min for 30 min;

[0049] c. Heat up the emulsified emulsion in step b to 95°C, then slowly add 3.55g of modified polyvinyl alcohol into the emulsion, after it is completely dissolved, add 0.95g of glycerin, and stir for 1 hour until the reaction is complete;

[0050]d. After the emulsion in step c is cooled to room temperature, add 27.5 g of water-based polyurethane resin and polyacrylate composite resin to the emulsion, and stir at room temperature for 15 minutes to obtain a fluorine-free waterproof and oil-proof food-grade coating.

[0051] The fluorine-free waterproof and oil-proof food-grade paint prepared in Example 2 is coated on food-grade white cardboard, and the coating amount is 8g / m 2 , bake at 60°C for 5min. T...

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Abstract

The invention discloses a fluoride-free waterproof oil-proof food-grade coating and a preparation method thereof. The coating is prepared from the following components, by mass: 3%-5% of modified polyvinyl alcohol, 5%-15% of palm wax, 1.5%-6.5% of an emulsifier, 25%-35% of compound water-based polymer resin, 0.5%-1.5% of glycerinum and 37%-65% of deionized water. The coating has good waterproof and oil-proof characteristics; after being applied to paper, the waterproof oil-proof coating has ideal waterproof oil-proof performance; the defect of poor oil-proof and water-proof performance of a paper material is overcome; the coating can replace coated paper, especially replace a fluorine-containing polymer in a waterproof and oil-proof agent, is a fluorine-free copolymer, and is environmentally friendly and easy to naturally degrade, thereby solving problems that the fluorine-containing coating is harmful to health, and the coated paper is difficult to recover and influences the environment; meanwhile, a problem of potential food safety hazards is solved. The coating is beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the field of food packaging and coatings, in particular to a waterproof and oil-proof food-grade coating coated on paper food packaging and a preparation method thereof. Background technique [0002] With the rapid development of economy and the enhancement of environmental awareness, paper packaging has become the largest packaging material used in catering, food packaging and other fields. Since it is in contact with food containing oil, fat or water, paper packaging must be waterproof, oil-proof and impermeable. [0003] In order to obtain the waterproof and oil-proof effect, most of the food packaging paper is currently coated with a thin layer of polyethylene plastic on the paper to form a continuous and dense organic polymer film, so that oil and water cannot pass through the protective layer, so as to achieve waterproof and anti-corrosion. purpose of the oil. High-end products are also packaged with silicone oil paper,...

Claims

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Application Information

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IPC IPC(8): D21H19/20D21H19/18D21H19/14D21H19/24D21H21/14D21H21/16D21H27/10
CPCD21H19/20D21H19/18D21H19/14D21H19/24D21H21/14D21H21/16D21H27/10
Inventor 陈挺朱华杨谭康梅孙小玲
Owner ZHONGSHAN TIAN JIA PAPER PROD
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