Sulphur-resisting acid-proof food can inner wall paint and preparation method thereof

A technology for food cans and coatings, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of low safety and sanitation, poor salt resistance, etc.

Active Publication Date: 2013-12-11
CHINA PAINT MFG CO SHENZHEN
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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 overcome the above-mentioned deficiencies in the prior art, and provide a kind of anti-sulfur and acid-resistant food can inner wall coating and a sulfur-resistant and acid-resistant metal packaging food ...

Method used

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  • Sulphur-resisting acid-proof food can inner wall paint and preparation method thereof
  • Sulphur-resisting acid-proof food can inner wall paint and preparation method thereof
  • Sulphur-resisting acid-proof food can inner wall paint and preparation method thereof

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preparation example Construction

[0044] Correspondingly, the embodiment of the present invention also provides a method for preparing a coating for the inner wall of a sulfur-resistant and acid-resistant food can with easily controlled conditions. The method can be used to prepare the above-mentioned anti-sulfur and acid-resistant food tank inner wall coating, specifically, the method comprises the following steps:

[0045] S01. Prepare the first solution of epoxy resin 1009: add epoxy resin 1009 into an organic solvent, and reflux at a constant temperature of 90° C. to 100° C. for 1 hour until the epoxy resin 1009 is completely dissolved to obtain epoxy resin 1009. organic solution;

[0046] S02. Mix the organic solution of epoxy resin 1009 with the remaining components: disperse the pigment into the organic solution of epoxy resin 1009 prepared in step S01 and then grind it, then add blocked isocyanate 3175 and additives , and the remaining organic solvent for dispersion treatment, or add blocked isocyanat...

Embodiment 1

[0070] A sulfur-resistant and acid-resistant food tank inner wall coating and a preparation method thereof, the sulfur-resistant and acid-resistant food tank inner wall coating includes components in weight percentages in Table 1 below.

[0071] Its preparation method is as follows:

[0072] Step 01. Start the mixer until the speed is 60 rpm, put solid epoxy resin, ethylene glycol monobutyl ether, propylene glycol methyl ether acetate and n-butanol into the reaction kettle with reflux device respectively, then raise the temperature to 90°C, and keep the temperature constant Reflux for 1 hour until the solid resin is completely dissolved;

[0073] Step 02. Cool the above solution to 40°C, transfer it to a stainless steel container, put titanium dioxide into it, stir evenly, start the disperser at a speed of 1000 rpm, and disperse for 15 to 20 minutes;

[0074] Step 03. Grind the above mixture through a horizontal sand mill to a fineness of less than 10 microns;

[0075] Step ...

Embodiment 2

[0079] A sulfur-resistant and acid-resistant food tank inner wall coating and a preparation method thereof, the sulfur-resistant and acid-resistant food tank inner wall coating includes components in weight percentages in Table 1 below.

[0080] Its preparation method is as follows:

[0081] Step 01, start the mixer until the rotating speed is 100 rpm, put solid epoxy resin, ethylene glycol monobutyl ether, propylene glycol methyl ether, propylene glycol methyl ether acetate and n-butanol into the reaction kettle with reflux device respectively, and then heat up to 100°C, constant temperature reflux for 1 hour, until the solid resin is completely dissolved;

[0082] Step 02. Cool the above solution to 40°C, transfer it to a stainless steel container, put titanium dioxide into it, stir evenly, start the disperser at a speed of 800 rpm, and disperse for 15 to 20 minutes;

[0083] Step 03. Grind the above mixture through a horizontal sand mill to a fineness of less than 10 micro...

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Abstract

The invention discloses a sulphur-resisting acid-proof food can inner wall paint and a preparation method thereof. The sulphur-resisting acid-proof food can inner wall paint comprises an organic solvent and an auxiliary and further comprises the following components in percentage by weight: 20 to 45 percent of epoxy resin 1009, 4 to 12 percent of blocked isocyanates 3175 and 0 to 32 percent of pigment. The preparation method of the sulphur-resisting acid-proof food can inner wall paint comprises the following steps; preparing first solution of the epoxy resin 1009; carrying out mixing processing on the first solution of the epoxy resin 1009 and the rest of components. An inner wall coating of a food can is formed by coating, baking and curing the sulphur-resisting acid-proof food can inner wall paint. The coating formed by the sulphur-resisting acid-proof food can inner wall paint has excellent acid resistance, sulphur resistance and salt tolerance; the color of the coating is not changed in the baking process and the coating is not corroded in the using process. Meanwhile, an excellent adhesion force is given to the coating and hardness, flexibility and scratch resistance of the coating are improved.

Description

technical field [0001] The invention belongs to the technical field of metal packaging coatings, in particular to a sulfur-resistant and acid-resistant food tank inner wall coating and a preparation method thereof. Background technique [0002] In metal packaging, in order to prevent corrosion and rust of packaging cans, paint is usually used to coat the surface of packaging cans for protection and aesthetics. The inner walls of traditional metal packaging coatings use epoxy and phenolic baking varnish systems. This type of coating is composed of epoxy resin, phenolic resin, pigments and fillers, additives, and solvents. During the baking process of the coating, the color changes seriously. This system cannot be used without Water-colored clear or white food can inner wall coating. [0003] At present, 6009 epoxy resin, ARADUR3380-1, aluminum paste, zinc oxide, and solvents are used in China to invent food can inner wall coatings, but this kind of food can inner wall coatin...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D7/12
Inventor 杨荣辉邓鸿吴晓斌
Owner CHINA PAINT MFG CO SHENZHEN
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