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Cathode electrodeposition coating method

A technology of cathode deposition and coating method, which is used in the direction of electrolytic coatings, coatings, electro -plating, etc., can solve the problems of complex control technology and cannot control the thickness of the membrane.

Inactive Publication Date: 2008-10-15
NIPPON PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The control of the liquid temperature is technically complicated, and at the same time, it only depends on the distance from the electrode, and cannot control the film thickness in a manner suitable for the object to be coated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0100] Manufacture of Blocked Isocyanate Curing Agent

[0101] 1,250 parts of diphenylmethane diisocyanate and 266.4 parts of methyl isobutyl ketone (hereinafter referred to as "MIBK") were added to the reaction vessel, and after heating at 80°C, 2.5 parts of dibutyltin dilaurate were added . Here, the solution in which 226 parts of ε-caprolactams were melt|dissolved in 944 parts of butyl cellosolves was dripped at 80 degreeC for 2 hours. After further heating at 100°C for 4 hours, it was confirmed that the absorption due to the isocyanate group disappeared in the measurement of 1R spectrum, and after natural cooling, 36.1 parts of MIBK were added to obtain a blocked isocyanate curing agent.

manufacture example 2

[0103] Manufacture of Matte Modified Epoxy Resin

[0104] Add 87 parts of 2,4 / 2,6-toluene diisocyanate (mass ratio = 8 / 2), 85 parts of MIBK and dilauric acid di 0.1 parts of butyl tin. While stirring the reaction mixture, 32 parts of methanol were added dropwise. The reaction started at room temperature and was exothermic to 60°C. The reaction proceeds mainly in the range of 60 to 65° C., and the reaction is continued until the absorption due to the isocyanate group disappears in the measurement of 1R spectrum.

[0105] Next, 550 parts of epoxy resins having an epoxy equivalent of 188 synthesized from bisphenol A and epichlorohydrin by a known method were added to the reaction mixture, and the temperature was raised to 125°C. Then, 1.0 parts of benzyldimethylamine was added, and it was made to react at 130 degreeC until the epoxy equivalent became 330.

[0106] Next, after adding 100 parts of bisphenol A and 36 parts of octanoic acid and making it react at 120 degreeC, epo...

manufacture example 3

[0109] Manufacture of Amine Modified Epoxy Resin

[0110] Add 87 parts of 2,4 / 2,6-toluene diisocyanate (mass ratio = 8 / 2), 85 parts of MIBK and dilauric acid di 0.1 parts of butyl tin. While stirring the reaction mixture, 32 parts of methanol were added dropwise. The reaction started at room temperature and was exothermic to 60°C. The reaction proceeds mainly in the range of 60 to 65° C., and the reaction is continued until the absorption due to the isocyanate group disappears in the measurement of the IR spectrum.

[0111] Next, 650 parts of an epoxy resin having an epoxy equivalent of 188 synthesized from bisphenol A and epichlorohydrin by a known method was added to the reaction mixture, and the temperature was raised to 125°C. Then, 1.0 parts of benzyldimethylamine was added, and it was made to react at 130 degreeC until the epoxy equivalent became 300.

[0112] Next, after adding 165 parts of bisphenol A and 29 parts of octanoic acid, and making it react at 120 degree...

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PUM

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Abstract

The invention provides a cathode electrodeposition coating method which causes film thickness of an electrodeposition coating film as uniform as possible during cathode electrodeposition coating of transporting coated objects (in particular to components) with various shapes and sizes. The cathode electrodeposition coating method processes the electrodeposition coating in the state of mixing the coated components with different sizes and / or shapes in a cathode electrodeposition coating bath, which is characterized in processing to adjust in the cathode electrodeposition coating bath so that the electrodeposition coating film formed when the thickness of electrodeposition is coated to 15mum is provided with a film resistance in the range of 700kappa omega.cm<2> to 1,800kappa omega.cm<2>.

Description

technical field [0001] The present invention relates to a cathodic electrodeposition coating method, and more particularly to a cathodic electrodeposition coating in which the difference in film thickness between the parts is small even when the cathodic electrodeposition coating is performed in a state where parts of different sizes and shapes are mixed. Coating method. Background technique [0002] Even a complex-shaped object can be coated down to the details, and can be painted automatically and continuously. Therefore, electrodeposition coating is not only applied to large-scale, complex-shaped objects such as automobile bodies. objects, and it is applied to the anti-rust primer of small parts. [0003] When painting small parts with electrodeposition coating, such as figure 1 As shown schematically, a part to be coated (object to be coated) 3 is suspended from a suspension device called a suspension device 4, moved by a conveying device 5, immersed in the electrodepo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/00
Inventor 大岛隆幸山田光夫坂本聪明坂本胜
Owner NIPPON PAINT CO LTD
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