As a performance of automotive clear coatings, the scratch resistance to car wash is needed. We replicated the situation that clear coatings are suffering scratches in scratch test, and with numerical simulation of scratch test, analyzed the relationship between material properties and scratch resistance of clear coatings. In consequence, we confirmed the correspondence between the numerical calculation results and the experimental results of scratch test, and the applicability of the numerical simulation analysis to the prediction for scratch resistance of clear coatings.
Mass balance calculation method, which is one of the evaluation methods to estimate the release rate of biocides into the sea from antifouling paints, is theoretical method but not the actual measuring one. This paper reports an actual measuring result in comparison with the theory of the mass balance calculation method. The procedure to achieve this purpose, consumed film thickness and consumed copper amount from test panels were measured to get the total amount of copper released, then divided by immersion periods to get the release rates of copper. The result of hydrolysis type antifouling paint showed constant copper release during the test periods. On the other hand, the result of ablative type antifouling paint showed larger copper release at the first two months then became smaller at the later periods. But when the lifetime of antifouling paints was considered, the results were close to the values of mass balance calculation method. From the results, both types of antifouling paint were considered to be applicable to mass balance calculation method.
We have synthesized novel silicon-containing polymer with a benzodioxane group by using a RhCl(PPh3)3 catalyst. The number-average and weight-average molecular weights of the obtained polymer were 11000 and 25000, respectively. The polymer was soluble in organic solvents such as toluene and chloroform. The fluorescence spectrum of the polymer showed photoluminescence peaks at 320 and 358 nm. Further, from the polymer was found to have high thermal stability, of which TG started to decrease at 428°C.
Direct synthesis of the patterned inorganic thin films was studied by using functionalized templates fabricated from mixed phase-separated Langmuir-Blodgett (LB) films. We have reviewed the direct synthesis of the inorganic thin films with the patterns of disk domains and nano wires through two methods. The one is “direct sol-gel synthesis of zirconia thin films”, and the other is “synthesis of silica particulate films using self-assembly of silica particles”. The driving force of self-assembly of silica particles on the functionalized templates was also investigated.
Because of their high fastness to light and heat and high colorability, the phthalocyanines are used in many fields of blue- and green-pigment application, such as printing inks, paints, and even LCD color filters. In recent years, phthalocyanines have been used as not only coloring materials but also functional materials, such as electronic materials, catalyst, and near-infrared absorber. In this paper, the history, chemical structure, chemical property, crystal structure, synthesis method, pigment manufacturing method, and optical property of phthalocyanine pigments are reviewed. A thin film of a phthalocyanine that has a bulky substituent show improved properties in blocking of stacking between aromatic skeletons and optical absorption and reflectance.
Pigment in paint and printing ink is dispersed uniformly in resin and solvent (vehicle). Commercialized dry powder pigment does not give good dispersion because of strong pigment particle aggregates when it is only stirred in vehicle. Required color strength, gloss and hiding power in paint and printing ink are satisfied by dispersing their aggregates. Aggregates and dispersion stability are the matter of surface chemistry, and pigment manufactures are trying to solve those problems. I commentate on dispersion of pigment, which is needed in all of application used pigment, focusing particle as pigment character in the view point of pigment manufacture.