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Volume 49, Issue 12
Displaying 1-5 of 5 articles from this issue
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Hitoshi TAKEBAYASHI, Masumi KOISHI, Shun'ichi NORO1976 Volume 49 Issue 12 Pages 693-701
Published: December 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe object of this paper is to investigate the kinetic mechanism in wet grinding of kaolin by using a centrifugal rotating-type ball mill. In the experiments previously reported, kaolin was mechanically ground in water by alumina balls at three rotating numbers of 230,350 and 500 rpm and, at the same time, stainless steel lining wall was gradually wore away by hard strikes with both alumina balls and kaolin particles. Then, stainless steel powder liberated was physically adsorbed on the surface of ground kaolin. In this paper, therefore, the authors studied on the kinetic mechanisms of both the grinding of kaolin and the physical adsorption of stainless steel powder on the surface of kaolin. From the study by proposed analysis methods I, II and III, the authors recognized the following results :
(1) As regards the grinding degree of kaolin, it was found that it is necessary to calculate the grinding rato constant of kaolin from the proposed analysis method III taking into the consideration of the grinding resistance of stainless steel powder to kaolin.
(2) The physical adsorption rate constant of stainless steel powder on the surface of kaolin was obtained by calculation of proposed analysis method II.
(3) After calculating the grinding rate or physical adsorption rate constants from the gradient at regular grinding intervals, these values were plotted against grinding degree. In consequence, the existence of three regions, such as grinding induced region, transition grinding region, and steady state grinding region was clearly found.View full abstractDownload PDF (1259K) -
Masaru MATSUOKA, Toshihiko NAGAHAMA, Teijiro KITAO1976 Volume 49 Issue 12 Pages 702-708
Published: December 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSA number of phthaloperinone pigments were synthesized by the reaction of 4, 5-diaminonaphthalimides with substituted phthalic anhydride as a substitute for heavy metal inorganic pigments, some of which were forbidden to use for food packages because of the toxic property.
The thermal behavior of these pigments was estimated by means of thermal gravimetric and differential thermal analysis. Solubility was also measured in xylene and 1-chloronaphthalene.
Annelation and/or heterocyclic annelation of pigment molecules improved markedly the heat resistance as well as other pigment properties such as resistance to organic solvents. The effect of molecular symmetry on the pigment properties was also discussed concerning the structural isomer [7] and [8].
From the results of pigment tests for polyolefin resin colour using the commercial perinone pigment as a standard, these have not enough pigment properties for use, because of the lack of brightness in colour and the poor resistance to migration.View full abstractDownload PDF (847K) -
Influence of the Photosensitizer Concentration and Irradiation Intensity to the Curing ReactionSeizi USHIAMA1976 Volume 49 Issue 12 Pages 709-713
Published: December 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSUltraviolet ray curing process of unsaturated polyester-monomer systems was studied by using the mass fraction of unpolymerized styrene monomer. The samples were prepared in the various photosensitizer concentration, and applied on tin leaf by the doctor blade to form films of 3 mills and cured by ultraviolet ray at 11-182 mW/cm2 for 2-400 sec. The cured films were subjected to heating in oven at 80°C for 3 hrs. The mass fraction of unpolymerized styrene monomer, Ct, was calculated from
Ct=heating loss % of cured sample/heating loss % of non-cured sample
The rate of curing reaction depends on the photosensitizer concentration and irradiation intensity The apparent rate of curing velocity was proportional to the 0.5th power of photosensitizer concentration and irradiation intensity A simple method is proposed to interpret the fraction of unpolymerized styrene monomer. Each curve of log Ct/Co v. s. log t plots, where t is the curing time, was shifted along the log t axis to form a singe master curve for all the samples. The method is similar to the time-temperature superposition law. The methods were discussed to predict the optimum condition at ultraviolet ray curing of unsaturated polyester-monomer systems.View full abstractDownload PDF (679K) -
Akira WATANABE, Kazuo NISHIZAWA1976 Volume 49 Issue 12 Pages 714-723
Published: December 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1492K) -
Tadaaki SATO, Yumi NAKATOGAWA1976 Volume 49 Issue 12 Pages 724-737
Published: December 20, 1976
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (2074K)
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