The effects of wood surface penetrability on the improvement of weatherability of exterior wood coatings

2015 Fiscal Year Final Research Report

• Project/Area Number: 25450250
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Wood science
• Research Institution: Forestry and Forest Products Research Institute
• Principal Investigator: Kataoka Yutaka 国立研究開発法人 森林総合研究所, 木材改質研究領域, 室長 (80353639)
• Co-Investigator(Kenkyū-buntansha): KIGUCHI Makoto 国立研究開発法人森林総合研究所, 研究コーディネータ, 木質バイオマス利用研究担当 (50353660) ; MATSUNAGA Hiroshi 国立研究開発法人森林総合研究所, 木材改質研究領域, 主任研究員 (80391184) ; ISHIKAWA Atsuko 国立研究開発法人森林総合研究所, 木材改質研究領域, チーム長 (00353574)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 木材 / 塗料 / 耐候性 / 浸透性 / 粗面化 / ラフソ－ン / 塗布量

Outline of Final Research Achievements

Surface roughening of substrate wood prior to coating may increase the coating weight and thus improve the weatherability of coatings. In this paper, we test this hypothesis and examine the effects of surface roughening on the performance of coatings. Sugi (Cryptomeria japonica) heartwood saw-textured (rough-sawn) specimens were prepared by band-saw and coated with a penetrating-type coating. It was found that the surface roughness and coating weight could be increased by controlling the feed speed of band-sawing. The results of accelerated weathering showed that there were positive and high correlations between coating weight and color stability, and between coating weight and water repellency. Such effects, however, were not always observed when thick-coating was applied to smooth-planed surfaces. These results indicate that the weatherability depends not only on the coating weight but also the penetrability of wood by coatings.

Free Research Field

木質科学、木質材料の耐候性