Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 62, Issue 6
Displaying 1-5 of 5 articles from this issue
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  • Study on Corrosion Preventive Treatment of Steel Pipes by UV Curable Coating (III)
    Effect of Acrylate Diluents and Additives on Properties of UV Curable Primers for Polyethylene Coating of Steel Pipes
    Tetsuzou ARAI, Masakazu OHKITA, Kunihiko ARAI
    1989 Volume 62 Issue 6 Pages 333-340
    Published: June 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.333
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    In order to optimize the formulation of ultraviolet rays curable primer (UV primer) for polyethylene (PE) coating of steel pipe, the relation between formulation and properties of UV primers of which base oligomer is epoxy di-acrylate has been investigated. And then it has been found what kind of acrylate diluents and additives has been suitable.
    Acrylate diluents with hydroxy group have given the UV primer low alkaline resistance as well as high adhesion to the adhesive with maleic anhydride branch. This phenomenon is due to that the hydroxy groups in acrylate diluent gives the UV primer high water absorption as well as high hydrogen bonding to carboxylic groups in maleic modified adhesive. The low alkaline resistance of UV primer induces the low cathodic disbonding resistance of PE coating. So, the acrylate diluents without hydroxy group has had to be used for the UV primer. And the glass transition temperature (Tg) of homopolymer prepared with the acrylate diluent has affected the Tg of the UV primer, so, the acrylate diluents with high Tg have been suitable to keep the adhesion strength high at high temperature.
    The alkaline resistance, mentioned above, has been also affected by the acid value of the UV primer and the acid value has been due to the residual acrylic acid in epoxy di-acrylate oligomer. Our research has made it clear that the addition of epoxy compound has been effective to reduce the acid value and the 2-4 wt% addition of bis-phenol A type epoxy of which numerical mean molecular weight is 380 has been the most suitable for the additive.
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  • Study on Corrosion Preventive Treatment of Steel Pipes by UV Curable Coating (IV)
    Effect of Curing Condition on Coating Properties of UV Curable Resins for Steel Pipe Protection
    Tetsuzou ARAI, Masakazu OHKITA, Kunihiko ARAI
    1989 Volume 62 Issue 6 Pages 341-347
    Published: June 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.341
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    Effect of the kind of the UV source and curing temperature on coating properties has been investigated on two types of UV resins, which have been prepared for the temporary rust prevention coating of steel tube and the primer of polyethylene anticorrosion coating for steel pipe.
    As for the UV source, high pressure mercury lamp and metal halide lamp have been comparatively estimated. The former has had high curing efficiency of the coating surface to have high UV energy distribution in the range from 200 nm to 320 nm. The latter has had high curing efficiency of the coating bottom to have high UV energy distribution over 330 nm. In order to estimate the effect of the UV wave length on the curing, many researches have been done with the EXCIMER laser UV radiation equipment which has oscillated UV ray of single wave length. From the result, it has been found that UV rays of the shorter wave length have been able to cure the surface of the coating more effectively than UV rays of the longer wave length and UV rays of over 330 nm have been able to cure the bottom of the coating where has been over 10 μm depth.
    And it has been found that heating the coated material has made the cure degree of the coating higher to decrease the viscosity of the coated UV resin. The heating effect has been found at the temperature range where the viscosity has been over 3000 cps. So, in the case of the high viscosity, over 3000 cps, UV resin coating, the high temperature UV radiation has been thought much effective to cure the coating in the state of high cure degree.
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  • Coloring of Anodic Oxide Film on Titanium by Hydrothermal Hydrolysis
    Seisirô ITÔ, Takashi ONAKA, Takayuki TSUBAKI
    1989 Volume 62 Issue 6 Pages 348-351
    Published: June 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.348
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    Coloring of the anodic oxide film was investigated by hydrothermally treating the porous anodic oxide film on titanium in the aqueous solution of metallic compound to fix the metal oxide (hydrate) deposited on the surface and in the pores of the film.
    The result indicates that the metal oxide can be fixed to the film by hydrothermally treating the metallic compound at a temperature of 150 to 200°C and the color of film is similar to that of the corresponding metal oxide. The result of the measurement by EPMA also indicates that the metal oxide deposits in the deepest part of pores as well as on the surface of film.
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  • Fine Chemicals for Organic Nonlinear Optical Materials
    Masaru MATSUOKA
    1989 Volume 62 Issue 6 Pages 352-359
    Published: June 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.352
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  • Design of Functional Polymers and Fine Chemicals
    Takeshi ENDO
    1989 Volume 62 Issue 6 Pages 360-368
    Published: June 20, 1989
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.62.360
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