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Coating composition, preparation method and zinc plating passivating material thereof

A composition and coating technology, which is applied in the direction of anti-corrosion coating, metal material coating process, coating, etc., can solve the problems of high cost and cumbersome procedures, and achieve the advantages of saving processing costs, simplifying processing technology, and durable passivation layer Effect

Inactive Publication Date: 2010-06-23
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the anti-rust oil film needed to protect the galvanized plate when leaving the factory in the prior art, and the anti-rust oil film needs to be removed before phosphating before electrostatic powder spraying in the household power plant, thus causing Due to the disadvantages of cumbersome procedures and high cost, a coating composition is provided. Using the coating composition to treat the galvanized sheet can passivate the surface of the galvanized sheet on the one hand. The step of phosphating the galvanized sheet, therefore, the galvanized sheet can be directly sprayed with electrostatic powder when it is transported to the power plant, which greatly simplifies the process and reduces the production cost

Method used

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Examples

Experimental program
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Effect test

Embodiment approach

[0019] According to one embodiment of the present invention, the preparation method of the coating composition comprises uniformly mixing a trivalent chromium compound with an acid, an auxiliary film-forming agent, a soluble zinc salt and water, and the addition of the acid is such that the resulting coating composition The pH value is 1-3, preferably 1-2. Usually, since the above components do not react with each other during the mixing process, they can be directly mixed within the above range to obtain a uniform stable phase. Stirring is preferably used to make the mixing more uniform.

[0020] As another embodiment, the method for preparing the coating composition according to the present invention may also include uniformly mixing chromium trioxide with an acid, an auxiliary film-forming agent, a soluble zinc salt and water, and the amount of the acid added is such that the obtained The pH of the coating composition is 1-3, preferably 1-2. Among them, the acid provides ...

Embodiment 1

[0034] This embodiment is used to illustrate the coating composition of the present invention and its preparation method and galvanized passivation material.

[0035] (1) Preparation of the coating composition: at 20°C, 0.28 moles of CrO 3 into solution, and slowly added 0.84 moles of H 3 PO 4 , after stirring the reaction at room temperature for 60 minutes, adding 0.02 moles of Zn(H 2 PO 4 ) 2 Stir evenly; then add 1.05 moles of phytic acid, stir evenly; add 80 grams of silica sol emulsion (TC-01 type produced by Qingdao Xingguo Paint Co., Ltd., silicon dioxide content is 25% by weight, pH value 5.3-6.8, dioxide Silicon particles with a diameter of 20-30nm) were stirred evenly, and deionized water was added to form a 1L solution, and the pH value of the mixture was measured to be 3. Measured with the AI ​​1200 atomic absorption spectrometer of AURORA Company in North America, the content of trivalent chromium in the composition is 0.25 mol / liter.

[0036] (2) Preparatio...

Embodiment 2

[0038] This embodiment is used to illustrate the coating composition of the present invention and its preparation method and galvanized passivation material.

[0039] (1) Preparation of coating composition: at 20°C, 1.2 moles of CrO 3 into solution, and slowly added 3.6 moles of H 3 PO 4 , followed by the addition of 0.2 mol ZnHPO 4 Stir well; then add the mixed acid of 0.4 mole of maleic acid and citric acid, stir well; add 50 grams of silica sol emulsion (Qingdao Xingguo Paint Co., Ltd. produces TC-01 type, silicon dioxide content is 25% by weight, pH Value 5.3-6.8, silicon dioxide particle diameter 20-30nm), stir evenly, and add distilled water to configure 1L solution, the pH value of the mixture is measured to be 2. The content of trivalent chromium in the composition measured by AI 1200 atomic absorption spectrometer of AURORA Company in North America is 1 mol / liter.

[0040] (2) Preparation of galvanized passivation material: the coating composition obtained in the ...

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Abstract

The invention provides a coating composition, which comprises trivalent chromium compounds, auxiliary filming agents, acid, dissoluble zinc salt and water, wherein the amount of the acid meets the requirement that the pH value of the coating composition is between 1 and 3. The invention also provides a preparation method of the coating composition, which comprises the following step: uniformly mixing the trivalent chromium compounds, the auxiliary filming agents, the acid, the dissoluble zinc salt and the water, wherein the adding amount of acid meets the requirement that the pH value of the coating composition is between 1 and 3. The invention also provides a zinc plating passivating material, which comprises a base material, a zinc plating layer and a passivating layer, wherein the zinc plating layer and the passivating layer are sequentially attached to the surface of the base material, and the passivating layer is a product obtained after the coating composition is dried. The passivating layer formed on the zinc plating material of the coating composition has the effect that the zinc plating material can also realize the corrosion resistance for a long time without being coated with an antirust oil film and has good attaching performance. The method of the invention omits the working procedures of coating and antirust oil removal, improves the production efficiency, saves the production time, and reduces the cost.

Description

technical field [0001] The invention relates to a coating composition and a preparation method thereof, and also relates to a galvanized passivation material coated with the coating composition. Background technique [0002] At present, galvanized sheets are still commonly used in my country's home appliance industry such as air conditioners, refrigerators, computer cases and other industries, and these galvanized sheets usually need to be coated with electrostatic powder spraying to make painted parts. However, before leaving the factory, a layer of anti-rust oil film is usually applied on the surface of the galvanized sheet to prevent it from rusting during transportation. The board is pre-treated and degreased to remove the anti-rust oil film, and then phosphating is carried out to increase the adhesion between the electrostatic powder coating and the substrate, and then the coating is carried out. In the above process, the coating of the anti-rust oil film in the galvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/06C23C22/07C09D1/00C09D133/04C09D5/08
CPCC23C2222/10C23C22/17
Inventor 许哲峰徐权陈永郭太雄程兴德张爱萍李国安
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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