NIPPON GOMU KYOKAISHI
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Volume 57, Issue 9
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 57 Issue 9 Pages 529-535
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.529
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1984 Volume 57 Issue 9 Pages 536-543
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.536
    JOURNAL FREE ACCESS
    Download PDF (617K)
  • STUDIES ON BONDING RUBBER TO METALLIC ZINC (III)
    THE EFECT OF ACCELERATORS ON ADHESION OF NR WITH COBALT SALTS TO ZINC PLATE
    Michio ASHIDA, Masaya NAKATANI, Yoshitaka TAKEMOTO, Makio GOTO
    1984 Volume 57 Issue 9 Pages 544-552
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.544
    JOURNAL FREE ACCESS
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    Vulcanization and adhesion to zinc plate of NR compounds with cobalt naphthenate or cobalt stearate was studied with many accelerators. NR Compounds with the cobalt salts were vulcanized similar to those without the salts by CBS, MBT, and other thiazole accelerators. The vulcanized rubber compounds produced a high adhesive strength to zinc plate. Addition of cobalt naphthenate to NR compounds gave higher adhesion than that of cobalt stearate. In the presence of cobalt naphthenate, polysulfidic crosslinks reduced with the curing time at 160°C and monosulfidic ones increased reversely, and adhesion strength decreased promptly at the temperture. The ultra-accelerators such as ZnMDC, TMTD, and NaMDC reacted with the cobalt salts under formation of a complex which was inactive to cure and the remainder of the cobalt naphthenate acted as a weak promotor for crosslinking. NR compounds accelerated with DPG did not adhere to zinc plate. It was found by ESCA that zinc surface of good adhesion was composed of zinc oxide, zinc sulfide, and zinc sulfate and the surface of poor adhesion was composed of zinc oxide and zinc sulfide.
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  • STUDIES ON BONDING RUBBER TO METALLIC ZINC (IV)
    EFFECT OF ADDING LIQUID RUBBERS TO NR ON ADHESION BETWEEN NR AND ZINC PLATE
    Michio ASHIDA, Yasukiyo UEDA, Yuuko HASHIMOTO, Fujio IWAMOTO, Shinzo Y ...
    1984 Volume 57 Issue 9 Pages 553-560
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.553
    JOURNAL FREE ACCESS
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    NR compounds which included various liquid rubbers together with cobalt naphthenate were vulcanized in contact with a zinc plate. The vulcanization character of the NR compound with cobalt naphthenate was little affected by addition of liquid polyisoprene or those with caboxyl group and hydroxyl one or liquid polybutadiene with hydroxyl group and epoxy one. When the curing temperature was under 150°C, the NR compounds with those liquid rubbers bonded strongly to a zinc plate, At curing temperature of 160°C, adhesion strength of the NR compound with cobalt naphthenate decreased rapidly with cure time. By adding liquid rubber with hydroxyl group, the NR compound hold the strong adhesion at 160°C. By adding liquid rubber with epoxy group, the NR compound did not bond to a zinc plate at 160°C. When a thin layer of mixtures of liquid rubber, cobalt naphthenate, sulfur, and CBS was heated on a zinc plate at 150°C, the mixtures were cured to crosslinking, except liquid polybutadiene with hydroxyl group. The mixture which included epoxy group formed a crosslinking structure with high density and sulfur and cobalt in the mixture transferred to the surface of a zinc plate.
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  • STUDIES ON CROSSLINKING ADHESION (II)
    CROSSLINKING ADHESION OF FLUORO RUBBER TO NITRIL OR EPICHLOROHYDRIN RUBBER
    Yoshiro NAKAMURA, Kunio MORI, Kohetsu WADA
    1984 Volume 57 Issue 9 Pages 561-569
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.561
    JOURNAL FREE ACCESS
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    Crosslinking adhesion of FR with NBR or CHA was examined by hot pressing of the combined rubber containing cocrosslinking agent. Optimum formulation of the each rubber was as follows. FR: DB2Na, 2; PEG, 2; TBuPBr, 1; MgO, 10phr. NBR: DB, 2; DTDM, 2; S, 0.3; TBuPBr, 1phr. CHA: DB, 1.4; DTDM, 1.3; LiOH, 0.7; TBuPBr, 0.7phr. The resulted peel strength FR/NBR, 1.8and FR/CHA, 2.1KN/m by hot pressing at 160°C for 30min was found to increase to 4.7 and 3.5KN/m by post curing at 180°C for 1h and at 150°C for 5h, respectively. The adhesion mechanism was discussed in regard to the role of cocrosslinking agent (DB), crosslinking activator (TBuPBr), crosslinking deactivator (DTDM) and the mechanical properties of the resulted blend rubbers.
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  • [title in Japanese]
    A. R. Nutt, [in Japanese]
    1984 Volume 57 Issue 9 Pages 569
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.569
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1984 Volume 57 Issue 9 Pages 590-591
    Published: 1984
    Released on J-STAGE: April 16, 2008
    DOIhttps://doi.org/10.2324/gomu.57.590
    JOURNAL RESTRICTED ACCESS
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