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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 needs to be baked at a temperature of 355°C, which not only consumes too much energy, but also bakes at such a high temperature for springs, high-strength bolt nuts, and thin-plate workpieces, which may easily cause annealing and thermal deformation accidents
Moreover, the paint contains a large amount of microbubbles, and the defoaming or antifoaming agents used in general paints do not work at all, which will directly affect the quality and appearance of the painted product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] 1. Preparation of test sample

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

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

[0037] A number of M12-18 screws, or a number of self-owned mechanical parts, are first soaked in an aqueous alkaline cleaning agent (temperature 70°C) to degrease and decontaminate, and after drying, send them to a crawler-type shot blasting machine for shot blasting and rust removal. The machine steel shot is Φ0.2~0.3mm, and the shot blasting takes 15~30 minutes until the workpiece exposes the gray and white iron base, which is qualified. Take half of the parts listed above for phosphating t...

Embodiment 1

[0043] 1. Prepare Agent A

[0044] According to the ratio of parts by weight, take 17.5 parts of 1,3-propylene glycol, 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 flake composite powder with a weight ratio of zinc to aluminum of 5:1, and use a Kolles high-speed disperser (Rotation speed: 1400 rpm) fully moisten and disperse evenly, then add 0.1 part of non-ionic polyurethane associative thickener, and stir with a mixer (rotation speed: 600-800 rpm) for 12 hours.

[0045] 2. Preparation of Agent B

[0046] Add 15 parts of γ-glycidyl etheroxypropyltrimethoxysilane to 35 parts of deionized water according to the ratio of parts by weight, and stir for more than 2 hours until the solution is colorless and transparent.

[0047] 3. Add agent A t...

Embodiment 2

[0053] 1. Prepare Agent A

[0054] According to the ratio of parts by weight, add 18 parts of 1,3-propylene glycol, 1.0 parts 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 superfine flaky zinc powder, 5 parts of dry powdered superfine flaky aluminum powder, fully wet and disperse evenly with a Kohlers high-speed disperser (rotating speed 1400 rpm), and then add 0.2 parts of non-ionic Type polyurethane associative thickener, stir for 12 hours with a mixer (600-800 rpm).

[0055] 2 prepare agent B according to the method of embodiment 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 some workpieces for trial coating after shot blasting, immerse them in the coating liquid for about 10 seconds, then centrifuge (500-1400 rpm) to shake off the remaining liquid, put t...

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PUM

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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.

Description

technical field [0001] The technical solution of the invention relates to a water-based paint and a preparation method thereof, in particular to a water-based chrome-free zinc-aluminum paint and a preparation method thereof. Background technique [0002] In today's market, the DACROMET® paint coating process for anti-corrosion of ferrous metal products is being replaced by chrome-free zinc-aluminum coatings GEOMET®, DEITAMKS®, MAGNi, ZiNTEK®, especially water-based, chrome-free, and environment-friendly GEOMET®. mainstream products. GEOMET® coating does not contain any resin components, which can provide anti-corrosion protection water dilutable coating composition in the document CN1172135A, which discloses a kind of epoxy and silanol functional groups of silane coupling agent and nonyl in aqueous medium The hydroxyl group of phenol polyoxyethylene ether is condensed (cross-linked) under high temperature conditions (355°C) to generate low-molecular silicone hydrocarbon cha...

Claims

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Application Information

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IPC IPC(8): C09D183/06C09D7/12
Inventor 林兴铭黄建民李清湘王宏声陈云鹏胡建军周少强伏志宏李昌政吴涛师平邱刚刘伟晶李璇蓝戈
Owner SHENZHEN NONFEMET TECH
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