Film forming agent and application of film forming agent in aluminium profile surface treatment chromate-free passivation solution

A chrome-free passivation and surface treatment technology, applied in metal material coating process, electrolytic coating, electrophoretic plating, etc., can solve the problems of poor base metal protection effect, inconsistent coating, poor heat resistance, etc., to achieve excellent resistance Salt spray properties, simple wastewater treatment, and the effect of improving adhesion

Inactive Publication Date: 2019-12-31
常州广树化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, chromate passivation is the most widely used at home and abroad, which can effectively improve corrosion resistance and has a mature process, but the hexavalent chromium contained in chromate is very toxic and has great harm to the human body and the environment. Hazards, countries around the world have strictly restricted or even banned its use, so people began to turn to environmentally friendly chromium-free passivation. Chromium-free passivation mainly includes inorganic passivation and organic passivation. Easy to fall off, poor adhesion, and easy to produce a porous structure, resulting in incoherent coatings and poor protection for the base metal. Although all-organic passivation is easy to adhere, it is too thick, difficult to connect, and has poor heat resistance. , the current chromium-free passivation tends to inorganic-organic composite passivation process
[0004] However, the problem in the inorganic-organic composite passivation process is how to enhance the compatibility of inorganic and organic substances in the passivation solution to improve the stability of the passivation solution; in addition, when using powder spraying technology, how to Improved bonding between passivation layer and powder coating

Method used

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  • Film forming agent and application of film forming agent in aluminium profile surface treatment chromate-free passivation solution
  • Film forming agent and application of film forming agent in aluminium profile surface treatment chromate-free passivation solution
  • Film forming agent and application of film forming agent in aluminium profile surface treatment chromate-free passivation solution

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Experimental program
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Embodiment approach

[0022] As an embodiment of the present invention, the film-forming agent is cationic-nonionic water-based epoxy-modified polyurethane, and its preparation comprises the following steps:

[0023] (1) Under the protection of an inert gas, add the vacuum dehydrated polyol and isocyanate into the flask respectively, stir and mix, then raise the temperature to 80-100°C, and react for 1-5 hours to obtain the first prepolymer;

[0024] (2) adding epoxy resin to the first prepolymer obtained in step (1), raising the temperature to 80-120° C., and reacting for 1-5 hours to obtain the second prepolymer;

[0025] (3) Add the chain extender dropwise to the second prepolymer obtained in step (2) under the condition of stirring, after the dropwise addition is completed, continue to react at 50-80°C for 1-5h, after post-treatment, Obtain cationic-nonionic water-based epoxy-modified polyurethane;

[0026] As an embodiment of the present invention, the polyol is selected from one or more of p...

Embodiment 1

[0059] This embodiment provides a chromium-free passivation solution for the surface treatment of aluminum profiles. According to mass percentage, the components of the chromium-free passivation solution include:

[0060] 0.1% sodium polyacrylate, 1.5% film-forming agent, 0.1% zirconate, 0.1% titanate, 1% nonionic surfactant, 0.01% glycol, and the rest is water.

[0061] In this embodiment, the weight average molecular weight of the sodium polyacrylate is about 2500.

[0062] In this embodiment, the zirconium-containing salt is a mixture of zirconium silicate and potassium fluozirconate; and the weight ratio of the zirconium silicate and potassium fluozirconate is 3:1.

[0063] In this embodiment, the titanate-containing salt is fluorotitanic acid.

[0064] In the present embodiment, the nonionic surfactant is a compound of glycerol monolaurate and polyoxyethylene (7) glycerol monococo fatty acid ester, and glycerol monolaurate and polyoxyethylene (7) The weight ratio of gly...

Embodiment 2

[0071] This embodiment provides a chromium-free passivation solution for the surface treatment of aluminum profiles. According to mass percentage, the components of the chromium-free passivation solution include:

[0072] 0.5% sodium polyacrylate, 3.0% film-forming agent, 0.5% zirconate, 0.5% titanate, 3% nonionic surfactant, 2.5% glycol, and the rest is water.

[0073] In this embodiment, the weight average molecular weight of the sodium polyacrylate is about 2500.

[0074] In this embodiment, the film-forming agent and its preparation method are the same as in Embodiment 1.

[0075] In this embodiment, the zirconium-containing salt is a mixture of zirconium silicate and potassium fluozirconate; and the weight ratio of the zirconium silicate and potassium fluozirconate is 3:1.

[0076] In this embodiment, the titanate-containing salt is fluorotitanic acid.

[0077] In the present embodiment, the nonionic surfactant is a compound of glycerol monolaurate and polyoxyethylene (...

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Abstract

The invention discloses aluminium profile surface treatment chromate-free passivation solution which comprises the following components in percentage by mass: 0.1-0.5% of sodium polyacrylate, 1.5-3.0%of a film forming agent, 0.1-0.5% of zirconate, 0.1-0.5% of titanate, 1-3% of a nonionic surfactant, 0.01-2.5% of dihydric alcohol and the balance of water. The film forming agent provided by the invention is used in the aluminium profile surface treatment chromate-free passivation solution and has better compatibility with zirconate and titanate; the prepared passivation solution has excellent salt fog resistance, does not nitpick the water quality, does not generate flocculent precipitate and also improves the adhesive force of a spraying paint with a substrate after passivation; and the aluminium profile surface treatment chromate-free passivation solution is stable in formula, longer in storing time, environmentally friendly, safe and non-toxic, simple in waste water treatment, low inusing unit cost, and does not contain chromium.

Description

technical field [0001] The invention relates to metal surface treatment, in particular to a film-forming agent and its application in chrome-free passivation solution for surface treatment of aluminum profiles. Background technique [0002] At present, the surface treatment methods of aluminum profiles mainly include anodic oxidation, electrophoretic coating and powder coating. These three processing methods have their own advantages and characteristics, and they all occupy a considerable market share in the market. Among them, powder spraying is to use powder spraying equipment (electrostatic spraying machine) to spray powder coating on the surface of the workpiece. Under the action of static electricity, the powder will be evenly adsorbed on the surface of the workpiece to form a powdery coating, which is compatible with anodic oxidation and electrophoresis. Compared with the powder coating process, the performance of the coating prepared by the powder coating process, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56C25D13/20C23C24/00
CPCC23C22/56C23C24/00C25D13/20
Inventor 刘风广刘凤全
Owner 常州广树化工科技有限公司
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