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Preparation method of low-temperature curing environment-friendly water-based chromium-zinc-aluminum-free coating

A zinc-aluminum coating, an environmentally friendly technology, applied in the direction of anti-corrosion coatings, coatings, etc., can solve the problems of excessive greenhouse gas emissions, environmental pollution, etc., achieve excellent stability, reduce costs, and improve stability.

Active Publication Date: 2022-04-29
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the curing temperature in the preparation process of domestic water-based chrome-free dacromet is mostly 300~350°C, which is relatively high. The energy consumption cost of the coating during the curing process accounts for 1 / 4 of the total cost, and will cause Excessive emission of greenhouse gases such as carbon dioxide and many environmental pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the present embodiment, the preparation method of low temperature curing environmentally friendly waterborne chromium-free zinc aluminum coating is as follows:

[0031] 1, weigh 150ml, PH is 5.5, 4g / L dopamine solution under room temperature conditions oscillation for 2h.

[0032] 2, the aluminum powder 60g, metal zinc powder 210g dispersed in polyethylene glycol 150g and glycol butyl ether 70g, stirred evenly after adding methyl trimethoxysilane 60g, dimethicone 5g, mixing stirring for 3h;

[0033] 3, methyl trimethoxysilane 70g, OP-10 (10g) and phytic acid 4g dispersed in 400g deionized water, dispersed for 30min; then add 30ml of dopamine solution, mixed stirring for 3h;

[0034] 4. Mix step 2 and step 3, add hydroxyethyl cellulose 1g, stir for 10h, and finally low-temperature curing environmentally friendly water-based chromium-free zinc aluminum coating.

[0035] The prepared paint is prepared with a concentration of 500g / L diethanolamine or triethanolamine solution...

Embodiment 2

[0037] In the present embodiment, the preparation method of low temperature curing environmentally friendly waterborne chromium-free zinc aluminum coating is as follows:

[0038] 1. Weigh 150ml, PH is 5.6, 6g / L of dopamine solution is shaken at room temperature for 4h.

[0039] 2, the aluminum powder 70g, metal zinc powder 200g dispersed in ethylene glycol 160g and glycol butyl ether 110g, stirred evenly after adding methyl trimethoxysilane 40g, dimethicone 4g, mixing stirring 4h;

[0040]3, methyl trimethoxysilane 90g, OP-10 (5g) and sodium molybdate 3g dispersed in 325g deionized water, dispersed for 20min; then add 50ml of dopamine solution, mixed stirring for 4h;

[0041] 4. Mix step 2 and step 3, add hydroxyethyl cellulose 0.8g, stir for 8h, and finally low temperature curing environmentally friendly waterborne chromium-free zinc aluminum coating.

[0042] The prepared coating was prepared with a concentration of 500g / L diethanolamine or triethanolamine solution adjusted PH ...

Embodiment 3

[0044] In the present embodiment, the preparation method of low temperature curing environmentally friendly waterborne chromium-free zinc aluminum coating is as follows:

[0045] 1. Weigh 150ml, PH is 5.7, 8g / L of dopamine solution is shaken for 5h at room temperature.

[0046] 2, the aluminum powder 60g, metal zinc powder 200g dispersed in ethanol 160g and ethylene glycol butyl ether 111g, stirred evenly after adding methyl trimethoxysilane 70g, dimethicone 4g, mixing stirring for 4h;

[0047] 3, methyl trimethoxysilane 60g, NP-9 (20g) and sodium phosphomolybdate 3g dispersed in 300g deionized water, dispersed for 20min; then added dopamine solution 60ml, mixed stirring for 2h;

[0048] 4. Mix step 2 and step 3, add 1g of hydroxyethyl cellulose, stir for 9h, and finally low-temperature curing environmentally friendly water-based chromium-free zinc aluminum coating.

[0049]The prepared paint is prepared with a concentration of 500g / L diethanolamine or triethanolamine solution ad...

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Abstract

The invention relates to a preparation method of a coating, in particular to a preparation method of a low-temperature curing environment-friendly water-based chromium-zinc-aluminum-free coating, and the prepared low-temperature curing environment-friendly water-based chromium-zinc-aluminum-free coating is free of hexavalent chromium, lead, mercury and cadmium heavy metal ionic compounds and free of volatile toxic solvents such as benzene and xylene. The low-temperature curing environment-friendly water-based chromium-zinc-aluminum-free coating is prepared from the following components in parts by weight: 4 to 20 parts of flaky aluminum powder, 15 to 40 parts of flaky zinc powder, 0.5 to 4 parts of an emulsifying agent, 5 to 25 parts of a dispersing agent, 5 to 20 parts of a cosolvent, 5 to 20 parts of methyltrimethoxysilane (MTMS), 3 to 10 parts of polydopamine, 0.1 to 3 parts of a corrosion inhibitor, 0.01 to 1 part of a thickening agent, 10 to 50 parts of deionized water and 0.01 to 1 part of a de-foaming agent. Under the condition that the stability of the coating and the salt spray performance of the coating are not influenced, the coating also has the characteristics of low-temperature curing, energy conservation, environmental protection, relatively strong adhesive force and the like.

Description

Technical field [0001] The present invention relates to a coating preparation method, in particular to a low temperature curing environmentally friendly waterborne chromium-free zinc aluminum coating preparation method. Background [0002] Dacro coatings have the characteristics of corrosion resistance and no hydrogen embrittlement, and are widely used in automobiles, machinery, ships and other fields, but due to the RoHS Directive (Electrical and Electronic Equipment Restriction on the Use of Certain Hazardous Substances Directive) and other environmental regulations prohibit the use of Cr 6+ , so that the application of dacro is more and more limited, so the research and application of environmentally friendly chromium-free dacro has received widespread attention and development. In recent years, there are two main development directions for chromium-free dacromet: one is solvent-based chromium-free dacromet coatings, represented by foreign Delken and Megali, and anti-corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D179/04C09D5/10
CPCC09D183/04C09D5/103C09D5/106C08K2003/0812C08K2003/0893C08L79/04C08K3/08C08K9/06
Inventor 李庆鹏卞启玉邓志远徐哲婷殷成龙王娜
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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