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Volume 45, Issue 11
Displaying 1-6 of 6 articles from this issue
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Hiroki TAMURA, Katsumi GOTO, Masaichi NAGAYAMA1972 Volume 45 Issue 11 Pages 629-636
Published: November 20, 1972
Released on J-STAGE: November 20, 2012
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The Wet Oxidation of Carbon Black and the Dispersibility in WaterTosihide KUWAHARA, Seisirô ITÔ1972 Volume 45 Issue 11 Pages 637-642
Published: November 20, 1972
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSThe purpose of this paper is to investigate about the dispersibility of oxidized carbon black in water, and also about the changes of the fundamental properties of these carbon blacks (e. g. specific gravity, bulk, surface area, pore volume, oil absorption, water absorption, pH and functional group such as carboxyl group on the surface).
The oxidation of carbon black (furnace type) was carried out by the aqueous solution of various oxidizing agents (potassium permanganate, sodium hypochlorite, ammonium persulfate, potassium dichromate, nitric acid and hydrogen peroxide).
The results obtained were as follow ;
1) The oxidation of carbon black by potassium permangamate, sodium hypochlorite and ammonium persulfate solution causes the nice dispersion in water.
2) The nice dispersion state in water cannot be obtained by the oxidation of carbon black with potassium dichromate, nitric acid and hydrogen peroxide, but in the case of oxidation with potassium dichromate and nitric acid, the nice dispersion state was obtained by the addition of sodium hydroxide.
3) The oxidation increases the amount of the oil absorption of carbon blacks, but decreases that of the water absorption.
4) Among the functional groups on the surface of carbon black, the carboxyl group shows the most marked influence to the dispersibility in water.View full abstractDownload PDF (805K) -
Hiroshi MAKISHIMA, Tsunehiko TOYODA, Noriaki OKAMURA1972 Volume 45 Issue 11 Pages 643-649
Published: November 20, 1972
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSPost-forming properties of paint films are important for pre-finished metals. In the previous paper, the results of measurement of elongation on T bend tests were reported. According to the results, the elongation of paint films on T bend tests is higher than ultimate elongation of free films which are peeled off from the substrates. Results of measurement of elongation and hardness of peeled paint films do not relate to post-forming properties of the paint films. Because post-forming properties change with the adhesive properties.
In this paper the relations between post-forming properties and mechanical properties of paint films were investigated. Polyester films coated with the paint were elongated. Ultimate elongation of paint films and the double refraction of elongated paint films removed from the polyester films were measured. T bend tests were practised in conditions of good adhesion.
These results fix the relations between post-forming properties and mechanical properties (elongation, hardness, adhesion and so on) of the paint films. When the adhesion is strong, hard and brittle paint films show high elongation and double refraction. Good adhesion reduce higher elongation than yield point and orientation, which increase elongation.View full abstractDownload PDF (855K) -
Kôtaro JIMBO1972 Volume 45 Issue 11 Pages 650-656
Published: November 20, 1972
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1101K) -
Isao TARI1972 Volume 45 Issue 11 Pages 657-662
Published: November 20, 1972
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (976K) -
Yasuyoshi TENMAYA1972 Volume 45 Issue 11 Pages 663-666
Published: November 20, 1972
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (607K)
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