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Acid-resistant food tank inner wall coating

A food can, acid-resistant technology, applied in anti-corrosion coatings, polyester coatings, coatings, etc., can solve the problem of poor corrosion resistance such as acid resistance, sulfur resistance, and salt resistance, evaporation residues that cannot meet food safety, and yellowing Blackening and other problems, to achieve good mechanical properties, improve storage stability, tough paint effect

Inactive Publication Date: 2017-02-22
蚌埠飞浦科技包装材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The paint used for the inner wall of food containers must meet strict environmental protection requirements; the existing white paint for the inner wall of food cans is invented with 6009 epoxy resin, curing agent, titanium dioxide, and solvent, but it is found through experimental analysis that it is resistant to acid, sulfur, and Salt and other corrosion resistance is still not strong, there is discoloration such as yellowing and blackening
At the same time, due to the selection of various components of the coating, its evaporation residue, free phenol, free formaldehyde and other indicators cannot meet the requirements of food safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] An acid-resistant paint for the inner wall of a food can, made of the following components in parts by weight: modified polyester resin 80, 2-methyl methacrylate 25, rosin 5, zinc oxide powder 5, filler 24, auxiliary agent 2 , solvent 60,

[0021] The filler is titanium dioxide;

[0022] The auxiliary agent includes a dispersant, a leveling agent and a defoamer, wherein the mass ratio of the dispersant, the leveling agent and the defoamer is 1:1:0.4;

[0023] The fineness particle diameter of described zinc oxide powder is 300-350 order;

[0024] The solvent is an equal mixture of two kinds of aromatic hydrocarbon solvents or alcohol solvents or ester solvents.

[0025] Further, the preparation method of the modified polyester resin is:

[0026] 1) At room temperature, add 1-2 propylene glycol and sodium dodecylbenzenesulfonate to water in a mass ratio of 4:1, stir and dissolve to obtain mixed solution A; take one-third of the volume of mixed solution A, and then tak...

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Abstract

The invention discloses an acid-resistant food tank inner wall coating. The acid-resistant food tank inner wall coating is prepared from modified polyester resin, 2-methyl methacrylate, rosin, zinc oxide powder, a filler, an additive and a solvent. Compared with an existing food tank inner wall coating, the food tank inner wall coating can greatly improve the storage stability of a food in a food tank, and a coating film is long in service life. Compared with a common food tank inner wall coating, the service life of the coating film is prolonged for 2-4 times. A paint coating formed after the acid-resistant food tank inner wall coating is applied is firm and tenacious, high in brightness, strong in adhesive power, strong in acid, sulfur and salt resistance properties and stable in performance, is not easily corroded and does not easily discolor. In addition, the inner wall coating is good in mechanical performance. The prepared coating has strong corrosion resistance after forming the film, and various technical indexes meet the food hygiene standards.

Description

technical field [0001] The invention relates to the field of metal packaging coatings, in particular to an acid-resistant food can inner wall coating. Background technique [0002] Food, especially beverages, condiments, alcohol, etc. are highly corrosive to their containers, and have high requirements for the corrosion resistance of food cans. Therefore, a layer of acid-resistant, oil-resistant, alkali-resistant anti-corrosion coating is applied to the inner wall of the food tank. The hygienic quality of paint directly affects food safety. The paint used for the inner wall of food containers must meet strict environmental protection requirements; the existing white paint for the inner wall of food cans is invented with 6009 epoxy resin, curing agent, titanium dioxide, and solvent, but it is found through experimental analysis that it is resistant to acid, sulfur, and Corrosion resistance such as salt is still not strong, and there is discoloration such as yellowing and bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/06C09D5/08C09D7/12
CPCC09D167/06C08L2205/035C09D5/08C08L93/04C08K2003/2296C08K2003/2241
Inventor 赵小弟
Owner 蚌埠飞浦科技包装材料有限公司
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