Aqueous chromium-free zinc and aluminum coating and preparation method thereof

A zinc-aluminum paint, water-based technology, applied in the direction of coating, etc., can solve the problems of short service life of paint, annealing, high energy consumption, etc., and achieve the effects of ensuring production and personal safety, shortening time, and working environment sanitation and cleanliness

Inactive Publication Date: 2012-06-20

SHENZHEN NONFEMET TECH

4 Cites 45 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] However, the industrialized coating production in the past few years has proved that the coating has an unpleasant and choking organic solvent taste. The necessity of the existence of this harmful and unpleasant organic solvent is that there are harmless common solvent insoluble material components in the coating, and this The coating has a short service life and fails after only 30 days

[0004] In addition, the coating disclosed in the CN1172135A patent application n...

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Abstract

The invention discloses aqueous chromium-free zinc and aluminum coating. The coating comprises an agent A and an agent B, which are mixed and blended uniformly when the coating is used, wherein based on the total weight, which is 100 percent, of the agent A and the agent B, the agent A comprises 1 to 5 weight percent of emulsifier, 10 to 25 weight percent of ethanol, 0 to 5 weight percent of deforming agent, 0 to 0.3 weight percent of thickener and 25 to 35 weight percent of metal zinc aluminum powder or zinc aluminum paste; and the agent B comprises 20 to 40 weight percent of deionized water, and 10 to 20 weight percent of silane coupling agent. The aqueous chromium-free zinc and aluminum coating does not contain hexavalent chromium, lead, mercury and cadmium heavy metal ion compounds or toxic organic solvents such as benzene and dimethylbenzene. The curing temperature of the coating is 250 to 300 DEG C, and the curing time of the coating is 20 minutes which is much shorter. The invention also provides the preparation method and the coating method of the aqueous chromium-free zinc and aluminum coating.

Application Domain

Coatings

Technology Topic

Silane couplingDefoaming Agents +10

Examples

Experimental program(6)

Example Embodiment

[0034] 1. Preparation of test sample

[0035] Use 150×70×1.0mm cold-rolled low-carbon steel, punch a Φ6mm hole at one end, and soak the standard sample in 200# solvent oil before coating to clean the oil stains with a brush, and let it dry. Afterwards, use a steel file to file the four sides, and then manually polish it with 0# sandpaper (cloth) until the gray iron base (activated) is covered with soft paper and put in a desiccator for use.

[0036] 2. Test the pretreatment of iron-based parts

[0037] Several M12-18 screws, or several self-owned mechanical parts, are first immersed in alkaline cleaning agent aqueous solution (temperature 70℃) for degreasing and decontamination. After drying, they are sent to the crawler-type shot blasting machine for shot blasting and blasting. Machine steel shot is Φ0.2~0.3mm, shot blasting 15~30 minutes until the workpiece is exposed to the gray iron base is qualified. Take half of the parts listed above for phosphating treatment and put them in a desiccator for standby. After shot blasting, the other half of the parts are cooled to room temperature, wrapped in soft paper and placed in a dryer for later use.

[0038] 3. Adhesion test

[0039] Use 3N/cm from 3M 2 Adhesive tape (special tape for signs) is tested for coating adhesion, and it is qualified in accordance with the standard GB/T5270-2005—cross-cut tape method.

[0040] 4. Neutral salt spray test (NSS)

[0041] According to the national standard GB/T 10125-1997, the test hours shall be terminated with a red rust spot.

Example Embodiment

[0042] Example 1

[0043] 1. Preparation of Agent A

[0044] According to the weight ratio, take 17.5 parts of 1,3-propanediol, 1 part of fatty alcohol polyoxyethylene ether (domestic brand O-10), 1.4 parts of fatty alcohol polyoxyethylene ether (domestic brand A-20), 3 parts of 200 #Solvent oil, 2 parts of polyoxyethylene polyoxypropylene block polyether (domestic brand X-1005), mix and stir, add 25 parts of flaky composite powder with a weight ratio of zinc to aluminum of 5:1, use a Koles high-speed disperser (Rotating speed 1400 rpm) fully moisten and disperse uniformly, then add 0.1 part of non-ionic polyurethane associative thickener, and stir for 12 hours with a mixer (rotating speed 600-800 rpm).

[0045] 2. Preparation of B agent

[0046] According to the weight ratio, add 15 parts of γ-glycidoxypropyltrimethoxysilane to 35 parts of deionized water, and stir for more than 2 hours until the solution is colorless and transparent.

[0047] 3. Add agent A to agent B and stir for 10 hours to obtain a uniform water-based zinc-aluminum paint, the paint viscosity (chai's 2# cup) is 30-40 seconds.

[0048] 4. Coating: Put 50 grams of the paint into the spray gun, spray it, put it in the experimental hot-air oven, bake and cure at 300℃ for 20 minutes, the surface of the coating is silver-white with metallic luster. The average value of the coating measured by the German Fischer D-MPOP thickness gauge is 3~5μm, and the adhesion tape method is the first level;

[0049] The first coating test standard board is sprayed twice and baked and cured at 300℃ for 20 minutes, and cooled to room temperature. The surface of the coating is silver-white and metallic. The coating is measured with a German Fischer D-MPOP thickness gauge. The average value of the coating is 8-9μm, and the adhesion tape method is one level;

[0050] Put the above sprayed standard board into the salt spray test box, and conduct the salt spray test according to the GB/T 10125-1997 standard, which can reach 600 hours.

[0051] Take five standard plates, and then composite paint commercially available amino resin coatings, the composite coating thickness of 10-14μm, neutral salt spray test (GB/T 10125-1997), up to 1000 hours.

Example Embodiment

[0052] Example 2

[0053] 1. Preparation of Agent A

[0054] According to the weight ratio, add 18 parts of 1,3-propylene glycol, 1.0 part of fatty acid polyoxyethylene ester (domestic brand SG), 1.8 parts of fatty alcohol polyoxyethylene ether (domestic brand A-20), 4 parts of 200# solvent oil , 20 parts of dry powdered ultra-fine scaly zinc powder, 5 parts of dry powdered ultra-fine scaly aluminum powder, fully wetted and dispersed evenly with a Corus high-speed disperser (rotating speed 1400 rpm), and then added 0.2 part of non-ionic Type polyurethane associative thickener, stir for 12 hours with a mixer (rotating speed 600-800 rpm).

[0055] 2 Prepare agent B according to the method of Example 1

[0056] 3. Add agent A to agent B and stir for 10 hours to obtain a uniform water-based zinc aluminum coating.

[0057] 4. Take a number of test-coated workpieces after shot blasting, immerse them in the coating solution for about 10 seconds, then spin off the remaining liquid in a centrifuge (500-1400 rpm), and put them in a hot air oven for curing. The curing temperature is 300°C, time 20 minutes. The surface of the coating is silver-white and metallic. The average value of the coating measured by the German Fischer D-MPOP thickness gauge is 3~5μm, and the adhesion tape method is the first level; repeat the above operation to carry out the second coating and curing , Cool to room temperature, the surface of the coating is silver-white metallic luster, the coating is measured with a German Fischer D-MPOP thickness gauge, the average value of the coating is 8-9μm, the adhesion tape method is one level;

[0058] Put the zinc-aluminum paint spray (or dip) coated standard board and the test-coated workpieces into the salt spray test box, and conduct the salt spray test according to the GB/T10125-1997 standard, which can reach 600 hours.

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Aqueous chromium-free zinc and aluminum coating and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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