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Research on Photo-degradation Behavior of E-coat

Article of Honda R&D Technical Review Vol.25 No.2

Summary

An automotive paint process that remove the primer process has been developed in order to reduce the energy consumption and CO2 emissions. An analysis method of the photo-degradation of the E-coat when the primer is removed was established, based on the changes in physical properties and chemical structures. As a result, the range of wavelength that cause peeling potential is under 550 nm. Based on these results, a layer to shield under 550 nm of light (1 base) was applied before the color development layer (2 base) without the drying process, enabling elimination of the primer process without limitation to color development.

Reference

(1) Kadowaki, K., Endou, M., Hiramatsu, Y.: Development of Waterborne Automotive Coatings Applicable in 3 Wet System Aiming at Environmental Protection, Toryou no kenkyu, No. 144, p. 50-54 (2005) (in Japanese)
(2) Muramoto, H.: Multi-Layered Electrodeposition Paint and its Application to Automotive Coatings, TECHNO-COSMOS, Vol. 17, p. 2-7 (2004) (in Japanese)
(3) Fox, M. A., Whitesell, J. K.: Organic Chemistry I, Maruzen Publishing, 356p. (1999) (in Japanese)
(4) Monney, L., Belali, R., Vebrel, J., Dubois, C., Chambaudet, A.: Photochemical degradation study of an epoxy material by IR-ATR spectroscopy, Polymer Degradation and Stability, Vol. 62, No. 2, p. 353-359 (1998)
(5) Atlas Material Testing Technology LLC: Atlas Weathering Testing Guidebook, p. 14 (2003)
(6) Guo, B., Liu, Z., Hong, L., Jiang, H., Yan Lee J.: Photocatalytic effect of the sol-gel derived nanoporous TiO2 transparent thin films, Thin Solid Films, Vol. 479, p. 310-315 (2005)
(7) Mochida, I.: Tansozai no kagaku to kougaku, Asakura Publishing, 248p., (1990) (in Japanese)
(8) Suzuki, H.: Chissosankabutsu no jiten, Maruzen Publishing, 484p., (2008) (in Japanese)

Author (organization or company)

Keisuke KOJIMA(Automobile R&D Center)、Takamasa AOKI(Automobile R&D Center)、Takeshi OGAWA(Automobile R&D Center)

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