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Chromium-free coating agent and preparation method thereof

The technology of a coating agent and a silane coupling agent is applied in the field of chromium-free coating agent and its preparation, which can solve the problems of failing to meet the requirements of the process, high product cost and high cost, and achieve the improvement of adhesion and corrosion resistance. Short, easy-to-manage effects

Active Publication Date: 2016-04-06
HUNAN JINYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent has the following disadvantages: N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane accounts for an excessively large proportion in the formulation composition, resulting in high product costs, resulting in a decline in market competitiveness and customer satisfaction. degree drop
However, this patent has the following disadvantages: the proportion of aminopropyltriethoxysilane and N-phenyl-3-aminopropyltrimethoxysilane in the formula composition is too large, resulting in high product cost and market competitiveness decline in customer satisfaction
However, this patent has the following disadvantages: the formula is an alkaline formula, which cannot form a dense film on the metal surface, but can only form an anti-rust water film, so it cannot be washed with water, which is far from meeting the requirements of the process

Method used

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  • Chromium-free coating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Each 1000Kg chrome-free coating agent is made from the following raw materials:

[0052] Fluorozirconic acid 20Kg, silane coupling agent (KH-550) 20Kg, silane coupling agent (KH-560) 3Kg, zirconium oxychloride 8Kg, citric acid 5Kg, water 944Kg.

[0053] Its preparation method comprises the following steps in turn:

[0054] (1) Add water to the reactor;

[0055] (2) Add silane coupling agent KH-550 into the reaction kettle, and stir until the silane coupling agent is completely hydrolyzed, and the stirring time is 7-9 hours;

[0056] (3) Add silane coupling agent KH-560 into the reaction kettle, and stir until the silane coupling agent is completely hydrolyzed, and the stirring time is 7-9 hours;

[0057] (4) Add fluozirconic acid to the reaction kettle, stir evenly, and make the solution clear, and the stirring time is 0.5-1.5 hours;

[0058] (5) Add zirconium oxychloride into the reaction kettle, stir evenly, and make the solution clear, and the stirring time is 0.5-1...

Embodiment 2

[0067] Each 1000Kg chrome-free coating agent is made from the following raw materials:

[0068] Fluorozirconic acid 20Kg, silane coupling agent (KH-550) 50Kg, silane coupling agent (KH-560) 3Kg, zirconium oxychloride 8Kg, citric acid 5Kg, water 914Kg.

[0069] The preparation method and the use method are the same as those in Example 1.

Embodiment 3

[0071] Each 1000Kg chrome-free coating agent is made from the following raw materials:

[0072] Fluorozirconic acid 40Kg, silane coupling agent (KH-550) 30Kg, silane coupling agent (KH-560) 5Kg, zirconium oxychloride 10Kg, citric acid 7Kg, water 908Kg.

[0073] The preparation method and the use method are the same as those in Example 1.

[0074] The preparation method is the same as in Example 1.

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Abstract

The invention relates to the field of a metal surface treatment agent, and particularly relates to a chromium-free coating agent and a preparation method thereof. The chromium-free coating agent is prepared from the following raw materials by mass percent: 2-6% of hexafluorozirconic acid, 1.7-6.7% of composite silane coupling agent, 0.8-1.5% of zirconium oxychloride, 0.5-1% of citric acid and the balance of water. The chromium-free coating agent does not contain chromium ions, has the characteristics of being short in treatment time, less in sediments, compact in crystal, stable in bath solution, easy to manage and the like, and is especially applicable to surface treatment of aluminum and aluminum alloy before coating. A layer of colorless corrosion-resistant passivation layer can be formed on the aluminum surface in a spraying or soaking manner, so that the adhesive force between a coating and a matrix and the corrosion resistance of the matrix are greatly improved.

Description

technical field [0001] The invention relates to the field of metal surface treatment agents, in particular to a chromium-free coating agent and a preparation method thereof. Background technique [0002] As we all know, hexavalent chromium can cause serious pollution to the environment. Its toxicity to the human body is also quite high, a high concentration of hexavalent chromium solution, half a tablespoon (about 2 ml) can cause human death. Most products containing hexavalent chromium are irritating to the skin, eyes and mucous membranes, and it can also interfere with wound healing. From the perspective of occupational health, workers who work in high-concentration hexavalent chromium mist are more likely to develop respiratory cancer. Because of these three reasons, European and American countries have carried out research on chromium-free replacement since the 1970s, and more and more industries are prohibited from using chromium-containing processes in the pre-treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34
CPCC23C2222/20
Inventor 桂成方
Owner HUNAN JINYU CHEM
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