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Pretreatment liquid capable of forming washable natural color conversion film on metal surface and preparation method thereof

A pretreatment liquid and metal surface technology, applied in the direction of metal material coating process, etc., can solve the problems of insufficient adhesion, workpiece cannot be washed with water, limitations, etc., and achieve the effect of improving adhesion, increasing roughness, and easy operation

Pending Publication Date: 2020-08-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the appearance of alkaline silane treatment solution in recent years has largely restored the true color of the metal, the treated workpiece cannot be washed with water, the adhesion is not enough, and some production quality problems are prone to occur during use. The metal pretreatment industry has caused certain limitations

Method used

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  • Pretreatment liquid capable of forming washable natural color conversion film on metal surface and preparation method thereof

Examples

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Effect test

preparation example Construction

[0046] In a second aspect, a method for preparing the above-mentioned pretreatment liquid is provided, comprising the steps of:

[0047] Dissolve the chelating agent and the auxiliary modifying material in the aqueous alcohol solution and react to obtain the modified chelating agent; the auxiliary modifying material includes C, N, O, H, P, S, B, Cl, F, Si At least three elements;

[0048] Then compound the chelating agent, modified chelating agent, auxiliary salt, auxiliary agent, complexing agent, neutralizing agent and water to prepare the pretreatment liquid.

[0049]In some embodiments, the auxiliary modification material is titanium dioxide, silicon dioxide, silane coupling agent KH-560, KH-540, KH-550, KH-8252, KH-792, silicon powder, polypropylene, polypropylene Sodium styrene sulfonate, Tween 20, Tween 40, Tween 60, Tween 80, polyvinyl alcohol 2000, polyvinyl alcohol 4000, polyvinyl alcohol 6000, polyvinyl alcohol 10000.

[0050] Further, the molar ratio of the chela...

Embodiment 1

[0061] A pretreatment solution that can form a washable natural color conversion film on the metal surface, consisting of the following components:

[0062] Chelating agent (hydroxyethylidene diphosphonic acid) 2%, modified chelating agent 5%, auxiliary salt (aluminum nitrate) 0.1%, auxiliary agent (sodium nitrate) 1%, complexing agent (sodium tartrate) 1%, neutralization Agent (sodium carbonate) 5%, the rest is water.

[0063] The preparation method of modified chelating agent comprises the steps:

[0064] Dissolve the chelating agent and auxiliary modifying material (titanium dioxide) into the alcohol-water mixture (the volume ratio of ethanol to water is 1:2), and add the uniformly dissolved chelating agent and auxiliary modifying material to the reaction while stirring. In the container, the ratio of the chelating agent and the auxiliary modification material is controlled at a molar ratio of 2:3, heated to 70°C, and kept at a constant temperature for 10 hours to obtain t...

Embodiment 2

[0071] A pretreatment solution that can form a washable natural color conversion film on the metal surface, consisting of the following components:

[0072] Chelating agent (amino trimethylene phosphonic acid) 7%, modified chelating agent 10%, auxiliary salt (aluminum nitrate) 0.2%, auxiliary agent (sodium nitrate) 1%, complexing agent (sodium tartrate) 2%, neutralization Agent (sodium carbonate) 7%, the rest is water.

[0073] The preparation method of modified chelating agent comprises the steps:

[0074] Dissolve the chelating agent and auxiliary modifying material (silicon dioxide) into the alcohol-water mixture (the volume ratio of ethanol to water is 1:1), and add the uniformly dissolved chelating agent and auxiliary modifying material in sequence while stirring In the reactor, the ratio of the chelating agent and the auxiliary modification material is controlled at a molar ratio of 1:10, heated to 100°C, and kept at a constant temperature for 8 hours to obtain the modi...

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Abstract

The invention discloses a pretreatment liquid capable of forming a washable natural color conversion film on the metal surface and a preparation method thereof. The pretreatment liquid is composed ofthe following components of 0%-10% of a chelating agent, 1%-12% of a modified chelating agent, 0.1%-0.2% of auxiliary salt, 0.5%-1% of an auxiliary agent, 0.05%-2% of a complexing agent, 0%-10% of a neutralizing agent and the balance water, wherein the modified chelating agent comprises at least three elements of C, N, O, H, P, S, B, Na, Ca, Mg, Fe, Zn, Cl, F and Si. The metal surface treatment liquid contains few types of substances and is simple and easy to operate, and a waste liquid is environmentally friendly and free of pollution; a treated workpiece can be washed with water to obtain the colorless and uniform natural color conversion film, the colorless and uniform natural color conversion film prevents the appearance of the metal workpiece from being damaged, and the application range of the pretreatment liquid is expanded to a great extent; and the conversion film obtained through the pretreatment liquid increases the surface roughness of a base material greatly, a film layeris firmly combined with the base material, and the adhesive force and the corrosion resistance of a coating and the surface of the base material are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of metal surface pretreatment, and in particular relates to a pretreatment solution capable of forming a washable natural color conversion film on the metal surface and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] At present, in industrial production, phosphating solution is generally used for metal surface treatment, and a dense porous film is formed on the surface of the workpiece. Although it can improve the corrosion resistance of metal surfaces, the carcinogenicity of hexavalent chromium has brought great hidden dangers to industrial production processes and waste liq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78
CPCC23C22/78
Inventor 马厚义夏雪爽赫威
Owner SHANDONG UNIV
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