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Volume 43, Issue 3
Displaying 1-6 of 6 articles from this issue
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On Grinding with A Three Roll MillTaiichi TSURITANI1970 Volume 43 Issue 3 Pages 105-117
Published: March 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe mechanism and ability of grinding with three roll mills were mainly studied. According to the dispersion mechanism between two rolls, the factors at nips of the three roll mills such as performances of dispersion systems, grinding of powders and conditions of the crown were discussed. Upon these theoretical considerations, six of the three roll mills were experimented and it was found that dispersion ratio, pressure-temperature coefficient, numbers of grinding, final grind and uniform flow out on the scraper should be measured in order to evaluate grinding ability of the three roll mills.
Furthermore, the control methods for the condition of the roll crown, numbers of the revolution, pressure, revolving ratio were discussed due to the mechanism at nip.
It was emphasized that pressure distribution, relationship between dispersion ratio and pressure relate with the viscosity of the material, critical beaking stres and pigment concentration.View full abstractDownload PDF (1545K) -
On The Temperature Control and Operation of A Three Roll MillTaiichi TSURITANI1970 Volume 43 Issue 3 Pages 118-123
Published: March 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe temperature control for the three roll mills as well as the pressure control was shown as the important governing factor with which rheological properties and dispersion properties of the ink are settled.
First in this study, the heat of friction at nip of the rotating two rolls was considered and the significance of the temperature-pressure coefficient was clarified. Then, the calculation formula for the increase of the temperature was given and the relationship between the temperature of the water and heat of friction was clarified.
These hypotheses by the author were applied to the three roll mills. The values of the calculated and observed for the ink of outer layer were obtained. It was found that the gloss of the dried ink was varied with the factors such as color, temperature, output, etc. As for the evaluation of the rolls, the temperature control was discussed and it was emphasized that the measurement of the temperature on operating the roll s and the pressure changes with the time should be carried out.View full abstractDownload PDF (701K) -
2, 9-Dimethyl Quinacridone PigmentsKunihiko TAKAGI, Kazuyuki KUROSU, Isao FUNJII1970 Volume 43 Issue 3 Pages 124-129
Published: March 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSPolymorphism of 2, 9-dimethyl quinacridone and its pigment properties have been studied.
2, 5-Di (4'-methylanilino) terephthalic acid 20.0g and polyphosphoric acid 200g were mixed and kept stirred at 140°C for 3 hrs., cooled to 120°C, then poured into the mixture of H2SO4 and alcohols such as Me0H, EtOH, n-PrOH or n-BuOH kept at room tempe-rature with vigorous stirring in the course of 5 min. The acid slurry thus obtained was kept stirred at 60-120°C for 5-180 min., poured into 2 l of cold water, filtered, and washed with 500 g of 10% aq. NaOH solution, obtaining ca. 18. 5 g of 2, 9-dimethyl quinacridone pigment. Crystal forms and particle shapes were studied with X-ray diffraction and electron micrograph.
Two crystal forms, super yellowish (a) and yellowish (β) shades, were formed depending on the kind of alcohol used and the alc./H2SO4 ratio. a-Form was the main product in n-BuOH, and β-form in Me0H. The increase in slurry tempe-rature increased the particle size. Transition of a to β form was observed as the the acid slurry was being mixed. The rate of transition was measured in n-BuOH, xylene, DMF, and N-methyl pyrolidone. Outdoor exposure test of the melamine-alkyd films of α-and β-form pigments gave rather poor results.View full abstractDownload PDF (1130K) -
Makoto SATO1970 Volume 43 Issue 3 Pages 130-134
Published: March 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSTwo sesquiterpene hydrocarbons and an azurene derivative were isolated from Melarorrhoea Usitata Wall, a Southeast Asian Urushi Lac., and their chemical structures were determined. The sesquiterpenes were identified as α-Gurjunene and Calarene from I. R. NMR. and mass spectra elemental analyses etc., and the azulene derivative as s-Guaiazulene.
Melanorrhoea Usitata Wall from Thailand and Burma, 500 g was mixed with acetone, 1.2 l, and the dark-brown colored acetone layer was filtered. Then acetone was distilled off to obtain 320 g of oil. The oil was vacuum ditilled to obtain small amount of blue-colored oil prior to the main component Thiol.
The blue oil, 100 g was vacuum distilled at 17 mmHg through a spinning band ditillation column to obtain the following three fractions.
1. by 131-135°C 37.5 g nD30 1. 4976-1. 4978
2. 135°C 37.0 g nD 30 1. 4981-1. 4999 3. 135-136°C 23.0 g nD30 1. 4982-1. 4995
The second and third fractions were mixed and subjected to gas chrmatography (Willkin's A-700), obtaining two peaks at retention times 4 and 5 min. The former was identified as α-Gurjunene and the latter as Calarene. The first fraction was dissolved in cyclohexane, subjected alumina-column chromatography, and vacuum distilled at 120°C, 4 mmHg, which was identified as s-Guaiazulene.View full abstractDownload PDF (562K) -
Kenjiro MEGURO, Hiroyoshi MURAYAMA1970 Volume 43 Issue 3 Pages 135-144
Published: March 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1467K) -
Rheologies of Painting and AdhesivenessHiroshi KAKIUCHI1970 Volume 43 Issue 3 Pages 145-151
Published: March 30, 1970
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (931K)
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