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Dip coatings for metal surfaces and methods of making and using the same

A coating and dip coating technology, applied in epoxy resin coatings, coatings, etc., can solve problems such as difficult to meet salt spray test and citric acid test, metal coating indentation, etc.

Active Publication Date: 2021-06-04
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 provide a kind of dip-coating coating for metal surface and its preparation method and using method, aim at solving existing indentation defect when dip-coating of metal coating, it is difficult to meet the technology of salt spray test and citric acid test question

Method used

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  • Dip coatings for metal surfaces and methods of making and using the same
  • Dip coatings for metal surfaces and methods of making and using the same
  • Dip coatings for metal surfaces and methods of making and using the same

Examples

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preparation example Construction

[0040] On the other hand, the embodiments of the present invention provide a method for preparing a dip coating, comprising the following steps:

[0041] S01: According to the ingredients and contents contained in the dip-coating coating described in the embodiment of the present invention, weigh the raw materials of each ingredient;

[0042] S02: Mixing the thermoplastic acrylic resin, cellulose acetate butyrate, epoxy resin, adhesion promoter, leveling agent, ethyl acetate and butyl glycol ether to obtain the dip-coating paint.

[0043] The dip-coating coating preparation method provided in the embodiment of the present invention prepares the dip-coating coating unique to the embodiment of the present invention. The synergistic effect of the components of the dip-coating coating solves the problem of indentation of the paint film after dip-coating and drying. The final coating dip-coating Good effect, smooth surface, high gloss, no indentation in construction, no need to bak...

Embodiment 1

[0055] 1. Add in sequence the components of Example 1 in Table 1, and stir evenly to form a mixed coating, which is the dip coating; wherein, the glass transition temperature Tg of the thermoplastic acrylic resin is Tg=95°C, and the acid value is 5mgKOH / g; In cellulose acetate butyrate, the butyl content is 45%, and the hydroxyl content is 1.0%; the epoxy equivalent of epoxy resin is 430 g / equivalent; the adhesion promoter is epoxy phosphate, and the leveling agent is organosiloxane alkyl.

[0056] 2. Add each component in sequence according to Example 1 in Table 2, and stir evenly to form a diluent.

[0057] 3. Mix the above-mentioned dip-coating paint and thinner at a volume ratio of 1:1.5 to obtain a dip-coating solution, put it into the metal workpiece to be coated and soak for 10-30 seconds, take it out and dry it naturally for 24 hours to test its performance ; The performance test conditions are shown in Table 3, and the final test results are shown in Table 4.

Embodiment 2

[0059] 1. Add in sequence the components of Example 2 in Table 1, and stir evenly to form a mixed coating, which is the dip coating; wherein, the glass transition temperature Tg of the thermoplastic acrylic resin is Tg=100°C, and the acid value is 3mgKOH / g; In cellulose acetate butyrate, the butyl content is 47%, and the hydroxyl content is 1.3%; the epoxy equivalent of epoxy resin is 450 g / equivalent; the adhesion promoter is epoxy phosphate, and the leveling agent is organosiloxane alkyl.

[0060] 2. According to Example 2 in Table 2, add each component in turn, and stir evenly to form a diluent.

[0061] 3. Mix the above-mentioned dip-coating paint and thinner at a volume ratio of 1:1.5 to obtain a dip-coating solution, put it into the metal workpiece to be coated and soak for 10-30 seconds, take it out and dry it naturally for 24 hours to test its performance ; The performance test conditions are shown in Table 3, and the final test results are shown in Table 4.

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Abstract

The invention belongs to the field of metal coatings, and in particular relates to a dipping coating for metal surfaces and a preparation method and application method thereof. Based on the total weight of the dip-coating paint as 100%, the dip-coating paint includes the following components in weight percentage: thermoplastic acrylic resin 40-60%; cellulose acetate butyrate 10-20%; epoxy resin 5% ‑15%; adhesion promoter 1‑2%; leveling agent 0.1‑0.5%; ethyl acetate 8‑20%; butyl glycol ether 0‑5%. The coating has good effect of dipping, smooth surface, high gloss, no indentation in construction, no need to bake, and the dried paint film has excellent resistance to salt spray and citric acid.

Description

technical field [0001] The invention belongs to the field of metal coatings, and in particular relates to a dipping coating for metal surfaces and a preparation method and application method thereof. Background technique [0002] The protective coating construction method of metal workpieces generally adopts the dip coating process, that is, a pile of small metal workpieces weighing more than ten kilograms is placed in a net bag, dipped in the diluted paint and tumbled several times, then dried in a centrifuge, and then poured into the collection Put the basket in the air outlet and blow it with hot air for about 3 minutes, and dry it at room temperature. [0003] Existing metal coatings are generally composed of nitrocellulose system. For example, some non-drying resin at room temperature is used together with nitrocellulose. The non-drying resin provides basic properties such as adhesion and gloss, and nitrocellulose provides the overall drying speed of the coating. When ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/04C09D101/14C09D163/00C09D7/20
CPCC09D133/04C09D7/20C08L1/14C08L63/00
Inventor 洪伟强吴晓斌余华伟
Owner CHINA PAINT MFG CO SHENZHEN
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