The effects of surface roughening of substrate wood on the improvement of weatherability of wood preservative semi-transparent coatings

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  • 木材保護塗料の耐候性能向上に及ぼす素地粗面化処理の影響
  • モクザイ ホゴ トリョウ ノ タイコウ セイノウ コウジョウ ニ オヨボス キジソメンカ ショリ ノ エイキョウ

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Surface roughening of substrate wood prior to coating may increase the coating weight and therefore improve the weatherability performance of wood preservative semi-transparent coatings （WPs）. In this paper, we tested this hypothesis and examined relationships among the extent of surface roughening, the increase in coating weight and the performance of WPs. Sugi （Cryptomeria japonica D.Don） heartwood rough-sawn （sawtextured） specimens were prepared by band-saw and subjected to coating with a penetrating-type WP. It was found that the arithmetic average roughness （Ra） as well as the coating weight for rough-sawn surfaces could be increased by controlling the feed speed during band-sawing. The coated specimens were then exposed to accelerated weathering for up to 2500 hours. The results 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 of WPs depends not only on the coating weight but also the penetrability of wood by WPs.

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