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Volume 59, Issue 2
Displaying 1-4 of 4 articles from this issue
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Hiroshi OYABU, Minoru TSUBOTA1986 Volume 59 Issue 2 Pages 61-67
Published: February 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSTwo types NAD (Non Aqueous Dispersion) were selected to improve and fill for Urushi, and physical properties of coating films mixed Urushi/NAD were studied.
Main results were as follows,
(1) Both NAD-A and NAD-C had a good mixing state. Separation, after thickening and gelation were not recognized during storage.
(2) NAD-A showed a similar tendency to mix oils and had behavior like as plasticizer.
(3) NAD-C was able to expect to improve gloss and transparency of Urushi film, and to be good filler as its disadvantage was less than oils and NAD-A although coating film mixed it had little a fall of viscoelasticity (high temperature E' and Tg).
From the results presented above, it is considered that coating film mixed Urushi/NAD is able to satisfy the request for its ability by preparing of NAD, that is, devising design of stabilizer or stabilizer/dispersion polymer ratio or Tg of dispersion polymer.View full abstractDownload PDF (1336K) -
Nobuo FURUNO, Masahiro ITAI, Akio TOKUYAMA1986 Volume 59 Issue 2 Pages 68-74
Published: February 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSIn cathodic electrodeposition process, it is said that the dissolution of metal substrate into the electrodeposited film does not occur. However, there are the reports that metal ion of substrate exists in the film, and hypothesis of following cathodic reaction is proposed :
M + 4 OH-→ [MO2]n- + 2 H2O + (4-n)e
In order to elucidate dissolution mechanism of metal substrate, authors had studied both metal ion contents of the electrodeposited film with the added electric current and the amount of dissolved metal of substrate when it is dipped in the electrodeposition bath without current.
In this study, the authors used the iron and zinc sheet as substrates. Metal ion concentration in the electrodeposited film is measured by the atomic absorption spectrometer.
The amount of metal ion contained in the film was calculated by the following equation :
M=m×c
where M : amount of metal ion
m : metal ion concentration in the electrodeposited film
c : nonvolatile matter of the electrodeposited film
On the other hand, weight change of substrate after electrodeposition is measured by removing the electrodeposited film with solvent, and weight change of substrate after dipping in electrodeposition bath without current is also measured.
As the result of this study, following facts were found.
1. In case of the zinc substrate, the anodic dissolution amount of zinc by anodic electrodeposition reached to one half of electrochemical equivalent of zinc.
On the other hand, zinc is also found in cationic electrodeposited film. It is not dissolved by the added current but dissolved by acidity of cationic electrodeposition bath
2. In case of the iron substrate, iron does not dissolve into the film in both anionic and cationic electrodeposition paint which are maked on the market now.View full abstractDownload PDF (784K) -
Yoshiaki OYABU1986 Volume 59 Issue 2 Pages 75-102
Published: February 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (3498K) -
Kazuo IGARASHI, Nobuo MASUI1986 Volume 59 Issue 2 Pages 103-111
Published: February 20, 1986
Released on J-STAGE: November 20, 2012
JOURNAL FREE ACCESSDownload PDF (1170K)
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