船舶に於ける外舷塗料の剥離について : 新しい外舷塗料について

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It has been burning questions among the dock yards that on the new ships, the paint film of hull top side was peeled off after short voyage and the priming coat showed its red or orange color among the top coat. This fact gives not only bad impression for appearance of new ships but also gives bad influences for the protection of hull because of succeeding to rust. These defects are considered mainly coursed by following facts : 1. By the progress in the practice of ship construction and the preparation of painting, the procedure of painting had made so much differ from former process and intervals between coatings were very much prolonged, therefore the primer films are exposed for long time before next coating.2. According to the progressive improvement of high polymer chemistry, we have adapted the phthalic resin as the vehicle of paints, however, the characteristics of this resin are not perfectly scrutinized.The question of adhesion of paint film on hull top side, we consider, should be solved completely by clarifying of following three factors : A. The composition of vehicle and pigments in the paint.B. The resolubility of primer films by the next coat.C. The permeability and swelling rate of paint film.In order to settle above factors, we made careful tests in our laboratory by means of our own creative testing installation in which we reproduced co-incident influence of water in sea going, we succeeded at last in obtaining suitable paints for severe services on hull top side and we found out excellent combination of primer and finish paint using the phthalic resin modified by linseed oil fatty acid and the phenolic resin varnishes.By adapting this combination of varnish and keeping its P.V.C. (Pigment Volume Concentration) 20 to 40,we succeeded to prevent peeling of hull top side paint.
社団法人日本船舶海洋工学会の論文

船舶に於ける外舷塗料の剥離について : 新しい外舷塗料について

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