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Title: 長崎港内に於ける船底塗料の塗り分け試験について
Other Titles: On the Test of Sectional Bottom Painting in Nagasaki Harbor
Authors: 阿部, 茂夫 / 矢田, 殖朗 / 井上, 正六 / 秋重, 祐章
Authors (alternative): Abe, Shigeo / Yada, Shigeaki / Inoue, Shoroku / Akishige, Yusho
Issue Date: Mar-1966
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.20, pp.58-69; 1966
Abstract: The training ship of the Nagasaki University Faculty of Fisheries, "the Nagasaki-maru", suffered about 15% decrease in speed on account of the bottom fouling at sea 112 days after her docking. In order to seek a paint suitable for "the Nagasaki-maru" which had been at anchor for a long time in Nagasaki Harbor where the ship's bottom is liable to be fouled by attaching organisms, the authors painted the bottom in seven kinds of paint in seven sections and obtained some data from the experiment at her docking after 134 days. Some studies on these results are reported here. 1) The species of the bottom fouling animals most abundant in Nagasaki Harbor from February to June was Hydroides norvegica, as shown by the results of the practical tests on the ship's bottom: 99.8% of Hydroides norvegica and 0.2% of Balanus amphitrite communis. The predominant bottom foulers are generally believed to be Balanus, and the contradictory result of the present experiment to this may be due to the environmental condition of Nagasaki Harbor, 2) The most suitable bottom paint for anti-fouling in Nagasaki Harbor was a combination of copper poison and mercury. A mixture of copper poison and organic poison proved to be unsuited for the antifouling bottom paint. The mixing rates of mercury and of modified rosin varnish relating to the leaching rate of the poison are left as problems for a future study. 3) In order to control the leaching rate of the poison which is influential in the anti-fouling properties of the paints, the ship's bottom should be coated with a thick layer of the paint suitable for her mother port or with a combination of the paint with some other paints of different ingredients having a property of anti-sea-water-defacement, according to the sailing plan from the time of docking. Thus, the bottom fouling will be prevented for a long time. 4) In parallel with the study to keep the bottom from fouling for a long time by selecting the suitable paint for the harbor and controlling the leaching rate of the poison, the preventive of propeller fouling must be devised 5) Based on the facts obtained from these experiments, furthe tests on sectional painting of the bottom, and studies on the larvae of attaching animals, which are important factors of the bottom fouling, are being carried out. / (1)長崎港内に於て,2月より6月までの間に,船底汚損生物は,カサネカンザシが大部分であり,実船試験による結果は,カサネカンザシ99.8%フジツボ0.2%であった.一般に船底汚損生物にはフジツボが多いと云われて居るが,これは長崎港の環境条件によるものと思われる. (2)長崎港に適合せる船底塗料は,銅毒物と水銀を組合せた船底塗料が最も適し,銅毒物に有機毒物を組合せた船底塗料は不適であった.但し水銀の混合比及び毒物溶出速度に関係ある,変性ロジンワニスの混合比は今後の研究問題である. (3)船底防汚性能を支配する毒物溶出速度をコントロールするため,出渠時よりの航海予定を考え,碇繋港に適合せる塗料を厚塗り,又は耐海水摩耗性を目的とした塗料の重ね塗り等,異成分塗料の組合せ塗装を行なえば,長期船底防汚の目的が達せられると考えられる. (4)その港に適合した塗料を選定し,又,毒物溶出速度のコントロールを行なって,長期船底防汚の目的を達する研究と,併行してプロペラの防汚対策を考えなければならない. (5)今後,現在までの実験により判明した事実を基礎として船底塗料の塗り分け試験,及び船底汚損の重要な成因をなす船底汚損附着生物幼生の研究を進めて居る.
URI: http://hdl.handle.net/10069/31512
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第20号

Citable URI : http://hdl.handle.net/10069/31512

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