Chromium-free passivation solution and preparation method thereof

A chromium-free passivation and resin technology, applied in the coating process of metal materials, etc., can solve the problems of high power consumption in anodic oxidation, increased sewage treatment costs, increased production costs, etc., to achieve improved hardness, good self-crosslinking properties, The effect of improving corrosion resistance

Inactive Publication Date: 2014-06-18
WENZHOU WANZHONG SURFACE TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The use of anodizing process involves the use of chemicals such as sulfuric acid or chromic acid, which causes environmental pollution and increases the cost of sewage treatment. At the same time, anodizing consumes a lot of power, resulting in an increase in production costs. The cost is three times that of oily varnishes. above

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of chromium-free passivation solution to replace anodizing:

[0042] According to the ratio

[0043] Modified waterborne epoxy resin PJ318 45%

[0044] Waterborne polyurethane PC200 10%

[0045] Amino resin 325 10% (product of Cytec Corporation)

[0046] WV33 silica sol 2%

[0047] γ-Glycidoxypropyl methyl diethoxysilane 4%

[0048] Defoamer BYK-025 0.2%

[0049] Wetting agent BYK-331 0.8%

[0050] The remainder is the diluent mixed together, and the mixed materials are uniformly dispersed in the sand mill to replace the chromium-free passivation solution for anodizing.

[0051] The prepared chromium-free passivation solution that replaces anodizing is applied to the surface of a clean embossed aluminum plate by a roller coating process, and the curing condition is baking at 180° C. for 3 minutes.

[0052]

Embodiment 2

[0054] Preparation of chromium-free passivation solution to replace anodizing:

[0055] According to the proportion of 30% modified waterborne epoxy resin PJ320 and 10% waterborne polyurethane resin Bayhydrol XP 2593, defoamer BYK022 is 0.2%, WV33 silica sol 5%, silane coupling agent β-(3,4 epoxycyclohexyl)-ethyl triethoxy silane 3%

[0056] Wetting agent BYK-333 is 0.8%, and the balance is the diluent. After mixing, the materials are uniformly dispersed in a sand mill to obtain a chromium-free passivation solution instead of anodizing.

[0057] The prepared chromium-free passivation solution that replaces anodizing is applied to the surface of clean embossed aluminum plate by roller coating process, and baked at 180° C. for 3 minutes to obtain embossed aluminum plate products.

[0058]

Embodiment 3

[0060] Preparation of chromium-free passivation solution to replace anodizing:

[0061] According to the proportion of 15% modified waterborne epoxy resin PJ320 and 10% waterborne polyurethane resin Bayhydrol PR340, defoamer BYK025 is 0.8%, WV33 silica sol 2%, silane coupling agent γ-aminopropyltriethoxysilane 4 %,

[0062] Wetting agent BYK-345 is 1.2%, and the balance is the diluent. After mixing, the materials are uniformly dispersed in a sand mill to obtain a chromium-free passivation solution instead of anodizing.

[0063] The prepared chromium-free passivation solution that replaces anodic oxidation is applied to the surface of clean embossed aluminum plate by a roller coating process, and the curing condition is 150 DEG C for 10 minutes to obtain embossed aluminum plate products.

[0064]

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Abstract

The invention discloses a chromium-free passivation solution comprising 15-60% of modified waterborne epoxy resin, 2-5% of silica sol and additives. The chromium-free passivation solution has the beneficial effects that 1, embossed aluminum plates having required high corrosion, acid and alkali resistance and hardness can be produced by directly applying the chromium-free passivation solution onto the embossed aluminum plate in a roller coating manner; 2, the chromium-free passivation solution has strong stability and good self-crosslinking properties, so that the coating having excellent overall performance can be obtained; 3, water-based modification of epoxy can be achieved, and good self-crosslinking properties are realized by introducing a variety of functional groups into grafting monomers of the modified waterborne epoxy resin, so that corrosion resistance is improved and the salt spray resistance can be improved by more than 100 hours; 4, the amino modified silane is used for chain extension of the grafted epoxy resin in the chromium-free passivation solution instead of the anodizing solution disclosed by the invention, and the adhesion between the coating and embossed aluminum plate is greatly improved by introducing siloxane groups; 5, the hardness of the film is greatly improved by adding silica sol in the formula, and the hardness of the coated embossed aluminum plate reaches 6H above.

Description

technical field [0001] The invention relates to the field of metal material surface treatment, in particular to a chrome-free passivation solution for forming a protective metal treatment film layer on the surface of embossed aluminum plates of refrigerators and freezers. The present invention also relates to a preparation method of the above-mentioned chromium-free passivation solution. technical background [0002] The embossed aluminum plate used in the refrigerator or freezer is a commonly used heat exchange and protection equipment, which plays a vital role in the operation of the refrigerator and freezer. The embossed aluminum plate is in direct contact with the refrigerated object, and it must have high corrosion resistance. Friction resistance of hardness, acid resistance and alkali resistance. [0003] Traditional embossed aluminum panels for refrigerators and freezers are generally coated with oil-based varnish, which is coated and cured by roller coating. The dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05
Inventor 易成会
Owner WENZHOU WANZHONG SURFACE TREATMENT TECH CO LTD
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