NIPPON GOMU KYOKAISHI
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Volume 38, Issue 9
Displaying 1-7 of 7 articles from this issue
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  • STUDIES ON THE HEAT-TREATMENT IN THE SYSTEM OF RUBBER-SILICA MIXTURE
    I HEAT-TREATMENT IN THE SYSTEM OF NATURAL RUBBER-SILICA MIXTURE
    K. Ono, T. Suzuki, K. Ishida, H. Matsushita, T. Hashida
    1965 Volume 38 Issue 9 Pages 729-734
    Published: September 15, 1965
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.38.729
    JOURNAL FREE ACCESS
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    Silica compounds have approximately the same static reinforcement as carbon black compounds, but they have disadvantages with respect to dynamic properties. In order to eliminate these disadvantages, examinations were carried out referring to the heat-treatment for them by means of a Banbury (1.8 litre volume). The process of this heat-treatment was as follows : The initial internal temperature of the Banbury was set at 80°C, supplying of cooling water was then stopped and the content was milled for 0, 10 arid 20 minutes while being heated by the heat produced at the stage of milling the sample.
    As the result of this treatment, it was found that dynamic properties which were regarded as the disadvantages of silica, namely, heat-build-up, set, repulsive elasticity, and so on, could be made similar to those of carbon black. However, heat-treatment caused deterioration of polymer and formation of polymer gel together, and a large difference was found between properties of the compound. For example, characteristics due to elongation such as tensile strength, coefficient of elongation, tear resistance, and the like; or hardness were not improved by heat-treatment, and the afore-mentioned dynamic properties were considerably improved within a definite range. Accordingly, in order to limit the lowering of the former and to exhibit the latter more effectively, we tried to find optimum condition from those illustrated below :
    Initial temperature of Banbury : 50, 80, 100 and 125°C
    Duration of heat-treatment : 0, 5, 10, 15 and 20 minutes.
    As the result, a compound was obtained which exhibited nearly satisfactory physical properties and dynamic properties when the initial temperature was from 80° to 100°C and heat-treatment lasted from 10 to 15 minutes.
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  • STUDIES ON THE HEAT-TREATMENT IN THE SYSTEM OF RUBBER-SILICA MIXTURE
    II. HEAT-TREATMENT IN THE SYSTEM OF SBR-SILICA MIXTURE
    K. Ono, T. Suzuki, K. Ishida, H. Matsushita, T. Hashida
    1965 Volume 38 Issue 9 Pages 735-739
    Published: September 15, 1965
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.38.735
    JOURNAL FREE ACCESS
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    In this paper, the results are described which were obtained when : Natural rubber studied in previous paper was replaced by SBR, the initial temperature of Banbury mixer was set at 30°C, supplying of cooling heat water was then stopped and the content was milled for 0, 10 and 20 minutes and heated by the produced at the stage of milling.
    As the result, disadvantages of silica were eliminated through heat-treatment; then, in order to give full justice to the effect as in the case of natural rubber, an attempt was made to find out the optimum condition from those illustrated below :
    Initial temperature of Banbury mixer : 30, 60 and 90°C,
    Duration of heat-treatment : 0, 10 and 20 minutes.
    As the result, a compound was obtained with physical properties due to elongation and dynamic properties which were nearly satisfactory when the initial temperature was from 60°C to 90°C and time of heat-treatment was 10 minutes.
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  • STUDIES ON THE BLEND OF RUBBER-LIKE MATERIALS AND THERMOPLSTIC RESINS
    IX. ON THE BLENDS OF POLYVINYLCHLORIDE, POLYETHYLENE, AND PORYPROPYLENE
    M. Imoto, Y. Minoura, K. Goto, A. Yabe, M. Takimiya, I. Ando, Y. Imaku ...
    1965 Volume 38 Issue 9 Pages 740-744
    Published: September 15, 1965
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.38.740
    JOURNAL FREE ACCESS
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    The properties of the blends such as PVC/polyethylene, PVC/atactic polypropylene, PVC/NBR/polyethylene, PVC/NBR/atactic polypropylene were studied.
    It was found that the compatibilities of PVC with polyolefine and of polyethylene with atactic polypropylene are not very good with their processibilities and properties being reduced through blending.
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  • [title in Japanese]
    [in Japanese]
    1965 Volume 38 Issue 9 Pages 745-754
    Published: September 15, 1965
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.38.745
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1965 Volume 38 Issue 9 Pages 755-765
    Published: September 15, 1965
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.38.755
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1965 Volume 38 Issue 9 Pages 801-802
    Published: September 15, 1965
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.38.801
    JOURNAL RESTRICTED ACCESS
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  • [title in Japanese]
    1965 Volume 38 Issue 9 Pages 803-806
    Published: September 15, 1965
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.38.803
    JOURNAL FREE ACCESS
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