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A surface treatment agent for metal materials before cathodic electrophoretic coating

A surface treatment agent, cathodic electrophoresis technology, applied in metal material coating process, electrophoresis plating, coating and other directions, can solve the problems of low surface resistance of metal materials, sparse and non-dense film layers, etc. Good wettability and good adhesion

Active Publication Date: 2017-03-08
NANJING KERUN LUBRICANTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical reaction film on the surface of the metal material obtained by the existing non-phosphating treatment method is thin, and the film layer is sparse and not dense, resulting in low surface resistance of the metal material. For automobile bodies and parts, or other industries with relatively complex structures For metal materials, it is especially necessary to form a dense and thick chemical conversion film layer on the surface of the metal material, thereby increasing the metal surface resistance, so that the electrophoretic coating has high throwing power when the metal material is subsequently coated with cathodic electrophoretic coating

Method used

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  • A surface treatment agent for metal materials before cathodic electrophoretic coating
  • A surface treatment agent for metal materials before cathodic electrophoretic coating
  • A surface treatment agent for metal materials before cathodic electrophoretic coating

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Experimental program
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Effect test

Embodiment 1

[0029] The present invention is used for the surface treatment agent before cathodic electrophoretic coating of metal materials. Each L of surface treatment agent consists of the following components: 100mg water-soluble oligosiloxane (Dynasylan Hydrosil 2926), 50mg zirconyl nitrate, 100mg titanyl sulfate, 100mg aluminum nitrate, 70mgLi 2 CO 3 , 100mg of sulfuric acid, 80mg of oxide nanoparticles grafted with amino groups and hydroxyl groups on the surface, 100mg of ethanol, 50mg of polyethylene glycol with a molecular weight of 600, 2mg of ferrous sulfate (ferrous sulfate can enhance the reactivity of the system and promote the occurrence of reactions and improve reaction efficiency) and the water balance; wherein, the grafted amount of hydroxyl groups on the surface of the oxide nanoparticles is 5 mmol / g, the grafted amount of amino groups on the surface of the oxide nanoparticles is 5 mmol / g, and the amount of grafted amino groups on the surface of the oxide nanoparticles i...

Embodiment 2

[0032] The present invention is used for the surface treatment agent before cathodic electrophoretic coating of metal materials. Each L of surface treatment agent consists of the following components: 80mg water-soluble oligosiloxane (Dynasylan Hydrosil 2926), 70mg water-soluble oligosiloxane Siloxane (Dynasylan Hydrosil 2776), 50mg fluozirconic acid, 100mg titanyl sulfate, 50mg aluminum nitrate, 50mg zinc sulfate, 70mg potassium hydroxide, 100mg nitric acid, 100mg oxide nanoparticles grafted with amino groups and hydroxyl groups on the surface, 120mg Ethanol, 80mg molecular weight is the polyethylene glycol of 600, 3mg ferrous sulfate and water balance; Wherein, the grafting amount of the hydroxyl group on the surface of the oxide nanoparticle is 1.4mmol / g, the amino group on the surface of the oxide nanoparticle The grafting amount was 3.8mmol / g, and the ratio of the grafting amount of hydroxyl groups and amino groups on the surface of oxide nanoparticles was 0.37.

[0033] Th...

Embodiment 3

[0035] The surface treatment agent used in the present invention before cathodic electrophoretic coating of metal materials is composed of the following components in each L of surface treatment agent: 50mg water-soluble oligosiloxane (Dynasylan Hydrosil 2926), 100mg water-soluble oligosiloxane Siloxane (Dynasylan Hydrosil 2776), 50mg fluozirconic acid, 100mg fluotitanic acid, 100mg zinc sulfate, 80mg ammonium bicarbonate, 120mg hydrofluoric acid, 100mg oxide nanoparticles grafted with amino and hydroxyl groups on the surface, 150mg ethanol, 100mg molecular weight is the polyethylene glycol of 600, 5mg ferrous sulfate and water surplus; Wherein, the grafting amount of the hydroxyl group on the surface of the oxide nanoparticle is 3.7mmol / g, the grafting amount of the amino group on the surface of the oxide nanoparticle The amount is 0.9mmol / g, and the ratio of the grafted hydroxyl groups and amino groups on the surface of oxide nanoparticles is 4.1.

[0036] The pH value of th...

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Abstract

The invention discloses a surface treatment agent used before metal material cathode electrophoresis coating. Every liter of the surface treatment agent comprises 80-150mg of water-soluble oligosiloxane, 50mg of zirconyl nitrate, 100mg of titanyl sulfate, 100mg of aluminum nitrate and / or zinc sulfate, 70-80mg of lithium carbonate, 100-120mg of hydrofluoric acid, 80-100mg of oxide nanoparticles with the surface grafted with an amino group and / or a hydroxyl group, 100-150mg of ethanol, 50-100mg of polyethylene glycol with the molecular weight of 300-600, 1-5mg of ferrous sulfate, and the balance of water, wherein the grafting amount of the hydroxyl group on the surface of the oxide nanoparticles is 1.4-5mmol / g, and the grafting amount of the amino group on the surface of the oxide nanoparticles is 0.9-5mmol / g. The surface treatment agent greatly improves the resistance of the metal surface.

Description

technical field [0001] The invention relates to a surface treatment agent used for cathodic electrophoretic coating of metal materials, belonging to the technical field of industrial media. Background technique [0002] Metal materials usually need surface treatment before painting to enhance the adhesion between metal and paint. At present, the metal surface treatment technology before painting mostly adopts phosphating treatment process. However, because this treatment method contains harmful heavy metal ions such as zinc and nickel and chemical components such as phosphorus, and produces a large amount of phosphating slag during production, it will cause potential harm to the environment. At the same time, the phosphating treatment technology consumes a lot of energy and relies heavily on the previous surface adjustment process, which will also increase the cost and management difficulty. [0003] As a technology that can replace the traditional phosphating treatment, zi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/48C25D13/20
CPCC23C22/34C23C22/48C25D13/20
Inventor 魏大力赵凯利聂晓霖
Owner NANJING KERUN LUBRICANTS
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