Improved Adhesion of Modified Polyurethane Coatings with Phenols on Steel Sheet

DOI Web Site 7 References
  • YOKOYAMA Naoki
    Electronic Materials R & D Center, Advanced Materials Division, Nippon Steel Chemical Co., Ltd.
  • FUJINO Kenichi
    Technology Development Group, Paints Division, Nippon Steel Chemical Co., Ltd.
  • KATO Hirotada
    Industrial Proprietary Right Cooperation Center

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  • フェノール類改質ポリイソシアネートを用いたウレタン樹脂硬化塗膜の対鋼板接着力向上効果に関する研究
  • フェノールルイ カイシツ ポリイソシアネート オ モチイタ ウレタン ジュシ コウカ トマク ノ タイ コウハン セッチャクリョク コウジョウ コウカ ニ カンスル ケンキュウ

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As tar-free heavy-duty anticorrosive coatings, we prepared modified polyurethane coatings with phenols. We tested the adhesion strength of the coatings on sandblasted steel sheets. When 2-naphthol that can block isocyanate group was added and 16-25% of that was blocked during the polyurethane formation, the adhesion strength of the coating was 1.8 times higher than that of the standard coatings without 2-naphthol. On the other hand, the adhesion strength of the coatings that were prepared with 16-25% less amount of isocyanates showed only about 1.3 times higher than that of the standard coatings. Therefore, the increase of the adhesion strength by the addition of 2-naphthol was thought not to be due to the retardation of curing, which lighten the shrinkage stress. Next, we measured the adhesion strength of the coatings with many kinds of phenols after 3000-h salt-water spray. As results, we found that the addition of alkylphenols and nitrophenols was in favor of the increase of the adhesion strength. We also found a dependence of the adhesion strength on the pKa of added phenols after 3000-h salt-water spray, which gave the maximum strength at pKa of 7.6.

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