NIPPON GOMU KYOKAISHI
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Volume 28, Issue 7
Displaying 1-6 of 6 articles from this issue
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  • STUDIES ON CONCENTRATED RUBBER SOLUTION I
    THE INFLUENCE OF SOME METALLIC SOAP
    NOBUHIRO URABE, SYUME NISHINO
    1955 Volume 28 Issue 7 Pages 393-398
    Published: July 15, 1955
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.28.393
    JOURNAL FREE ACCESS
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    The authors have studied, by use of a Stomer viscosimeter, the changes caused in concentrated solutions of masticated rubber when certain types of metallic soap had been added to them, and have reached a presumption that metallic soap added to rubber solution rather simply influences the state of dissolution of rubber molecules than causes depolymerisation of rubber molecules.
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  • STUDIES ON ORGANIC POLYSULPHIDES-VI
    ON THE REACTION BETWEEN METALLIC OXIDES AND ORGANIC POLYSULPHIDES
    YUJI MINOURA
    1955 Volume 28 Issue 7 Pages 399-407
    Published: July 15, 1955
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.28.399
    JOURNAL FREE ACCESS
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    The authors who have described the reaction bewteen organic polysulphides and several chemical reagents, describe in this paper the reaction between polysulphides and metallic oxides, making organic polysulphides and mercaptan react on metallic oxides (ZnO, PbO) for 6 hours at 135°C, and then isolating and identifying the reaction products.
    Organic polysulphides and mercaptans used are benzyl type and tolyl type mono-, di-, tri-, tetra-sulphides and mercaptans.
    These mercaptans react easily with ZnO and PbO and give mercaptides. Formation of disulphides was also observed, probably due to oxidation, but metallic sulphides were not formed under these reaction conditions.
    The authors formed that mono- and disulphides did not react with ZnO and PbO. Tri- and tetrasulphides react with ZnO and PbO and produce zinc sulphide and lead sulphide. In the reaction with PbO there occurred devulcanisation reaction, and tri-, tetrasulphides changed themselves into disulphides, while in the reaction with it was observed that tolyl tri- and tetrasulphides showed no effect, but that benzyl tri- and tetrasulphides changed themselves into stilben and benzaldehyde.
    It is supposed that there occurs not forming reaction due to combined sulphur when polysulphide type synthetic rubber is vulcanised with ZnO or PbO, but in the reactions between organic polysulphides and metallic oxides, no formation of such compound was seen. Thus the authors have reached a conclusion that vulcanisation of polysulphide type synthetic rubber means that -SH radical in the terminal group makes captide- or sulphide-reaction and the polymerisation degree is raised.
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  • STUDIES ON VULCANIZATION ACCELERATOR-XLIV
    STUDIES ON DELAYED ACTION ACCELERATOR 9 : THE COMBINATION EFFECT OF N-CYCLO-HEXYL-BENZOTHIAZOL-α-SULPHENAMIDE AND OTHER ACCELERATORS
    YUTAKA KAWAOKA, HIDEO ODA
    1955 Volume 28 Issue 7 Pages 408-414
    Published: July 15, 1955
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.28.408
    JOURNAL FREE ACCESS
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    When the recipe of a rubber compound for production of rubber goods is designed with a combined use of accelerators, it is necessary to take into consideration, keeping in view the characteristics of each accelerator, such points as increase of efficiency, reduction, of production cost, safety of processing (prevention of scorching), and better quality of finished goods. It has already been made, known that the combined use of N-cyclo-hexyl-benzothiazol-2-sulphenamide (abbrev. below : CM) and diphenylgnanidine (D) or tetramethyl-thiuram-disulphide (TT) shows excellent effect of combination. The author describes in this paper the studies made, in keeping in view the above given points, on the results when with CM 2 or 3 kinds out of dibenzo-thiazol-disulphide (DM) as thiazol type accelerator, and hexamethylene-tetramine (H) as aldehyde-amine type accelerator are used.
    These studies have shown that, when the ratio of combination is
    CM : H =0.5 : 0.1 (Sample B)
    CM : H =0.4 : 0.2 (SampleC),
    the result from the point of view of scorching is not only as good as when CM alone is used (Sample A) but tensile strength as well as modulus is greater.
    When DM is used for a part of CM, the vulcanization velocity is great when the ratio is about CM : DM = 0.3 : 0.4 (Sample D) or CM : DM = 0.2 : 0.5 (Sample E), and the tensile strenght at the optimum cure is large in sample D, but the platean effct is inferior to sample A (CM : DM = 0.6 : 0.1). There is a tendency that the move CM is used, the tensile strength as well as modulus becomes larger.
    The author has been that the combined use of CM +DM+H activitates CM+DM, gives non-staining vulcanizate and shows good plateau effect.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1955 Volume 28 Issue 7 Pages 415-420
    Published: July 15, 1955
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.28.415
    JOURNAL FREE ACCESS
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  • Isocyanates and Their Reaction Products. H.H.Abernathy : Rubbcr World, 131, 765 (1955)
    [in Japanese]
    1955 Volume 28 Issue 7 Pages 421-426
    Published: July 15, 1955
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.28.421
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1955 Volume 28 Issue 7 Pages 427-434
    Published: July 15, 1955
    Released on J-STAGE: October 16, 2009
    DOIhttps://doi.org/10.2324/gomu.28.427
    JOURNAL FREE ACCESS
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