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Development of High-paintability Waterborne Primer Paint

Article of Honda R&D Technical Review Vol.23 No.1

Summary

Waterborne primer paint is easily affected by temperature and has to be applied under certain temperature conditions, and so in order to save energy there is a need to expand the range of painting temperatures. To expand the range of painting temperatures, painting resin compositions were studied that can control changes in paint viscosity in relation to changes in paint solid content. By increasing the ratio of hydrophilic component of paint resin, it was discovered that the interaction of resin in the low solid-content range directly after application was strengthened and high viscosity was achieved, while resin phase transformation in the high solid-content range prior to drying was mitigated and low viscosity achieved, thus controlling changes in paint viscosity. This technique was used to develop paints, with the result that the range of painting temperatures, which was plus or minus 3deg C with conventional paints, was expanded to plus or minus10deg C.

Reference

(1) Matsubara, I.: Suiseikanitomonau jidoushatosoubuusuno CO2 sakugengijutsu, Journal of the Japan Coating Technology Association, Vol. 47, No. 1, p. 20-29 (2007) (in Japanese)
(2) Hiwara, A., Igarashi, H.: Study on Water-based Painting System able to Control Smoothness and Anti-sagging Property under Fluctuation of Atmospheric Conditions, Toryounokenkyuu, No. 151, p. 9-16 (2009)
(3) Kida, M.: Design technique of Waterborne Primer Surfacer for Automotive Coatings, TECHNO-COSMOS, Vol. 19, p. 31-36 (2006)
(4) Nagura, O.: Toryousekkeino kiso, Suisei coating zairyouno kaihatsuto ouyou, CMC, p. 183-186 (2004) (in Japanese)
(5) Otsubo, Y.: The Present Status and Prospect of Suspension Rheology, Journal of the Society of Rheology Japan, Vol. 31, No. 1, p. 15-22 (2003)

Author (organization or company)

Satoru IHARA(Automobile R&D Center)

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