NIPPON GOMU KYOKAISHI

[title in Japanese]

[in Japanese]

1984 Volume 57 Issue 10 Pages 593-602
Published: 1984
Released on J-STAGE: April 16, 2008

DOIhttps://doi.org/10.2324/gomu.57.593

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[title in Japanese]

[in Japanese]

1984 Volume 57 Issue 10 Pages 603-609
Published: 1984
Released on J-STAGE: April 16, 2008

DOIhttps://doi.org/10.2324/gomu.57.603

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STUDIES ON POLYFUNCTIONAL ADDITIVES (VI) NOVEL ANTIOXIDANT SELECTED FOR PEROXIDE CROSSLINKING SYSTEM OF RUBBERS-2, 4, 6-TRI(ANTIOXIDANT GROUP)-1, 3, 5-TRIAZINE

Yoshiro NAKAMURA, Kunio MORI, Kosaku TAMURA, Yoshiko SAITOH

1984 Volume 57 Issue 10 Pages 610-615
Published: 1984
Released on J-STAGE: April 16, 2008

DOIhttps://doi.org/10.2324/gomu.57.610

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2, 4, 6-tri-R-1, 3, 5-triazine [I] containing antioxidant substituent (R=-NHC₆H₄NHC₆H₅, -OC₆H₄NHC₆H₅) was found to perform as an effective antioxidant not to decrease the crosslinking reactivity of the peroxide. The effectiveness of I was observed for the crosslinking reactivity of dicumylperoxide, 1, 1-bis (t-butylperoxy)-3, 3, 5-trimethylcyclohexane, and 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexyne on the peroxide crosslinking of EPR, NBR, IR and EPDM. An excellent antioxidant property with the combination of a low volatility of I was proved on the thermal ageing of those crosslinked rubbers.

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STUDY ON CROSSLINKING ADHESION (III)

EFFECT OF ADDITIVES ON THE VULCANIZING ADHESION OF EPDM TO BRASS PLATES WITH TRIAZINE THIOL FILM

Kunio Mori, Yoshiro Nakamura, Mitsuru Shida

1984 Volume 57 Issue 10 Pages 616-621
Published: 1984
Released on J-STAGE: April 16, 2008

DOIhttps://doi.org/10.2324/gomu.57.616

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Effect of the unsaturating group content of EPDM and the kind and the amount of additives the vulcanizing adhesion of EPDM compounds onto brass plates with triazine thiol film on surface have been investigated. ZnO and stearic acid had little effect on the peel strength of the adherends. The peel strength, however, was influenced by the kind and the amount of accelerators, and by the amount of sulfur, becouse their additives relate directly with the reaction between the film and EPDM. Sulfenamides were an effective accelerators on the vulcanizing adhesion, and the pKa of amines and stearic hindrance of amino groups in sulfenamides had a great influence on the peel strength of the adherends. Antioxidants such as hindant phenols and amines with bulky groups were effective for the vulcanizing adhesion and the heat resistance of the adherends. Amine components in EPDM compounds were undesirable as they destroy the films. The effect of carbon blacks on the peel strength is due to their reinforce effect. The addition of oil was effective to accelerate the wetability of EPDM compounds onto to brass plates with films. The heat resistance of the adherends were improved by the selection of antioxidants. The adherends had very excellent water proof.

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STUDY ON CROSSLINKING ADHESION (IV)

VULCANIZATION OF EPDM WITH TRIAZINE THIOLS AND THEIR DERIVATIVES

Kunio Mori, Yoshiro Nakamura, Mitsuru Shida

1984 Volume 57 Issue 10 Pages 622-629
Published: 1984
Released on J-STAGE: April 16, 2008

DOIhttps://doi.org/10.2324/gomu.57.622

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Vulcanization of EPDM with trazine thiols, poly (triazine disufide), or the copper mercaptides of triazine thiols has been investigated in order to confirm the reaction between EPDM and a triazine thiol film with thiol, disulfide, copper mercaptide groups on brass plate surface in the vulcanizing adhesion of EPDM onto the brass plates at 160°C. The vulcanization of EPDM with triazine thiols, easily occurred in the copresence of sulfenamides, ZnO, and stearic acid at 160°C. EPDM was vulcanized by poly (triazine disulfide) in the copresence of accelerators such as CBS, TMTM, cychrohexylamine, and CMBT, and ZnO at 160°C. Further, the copper mercaptides were found to act as a vulcanizing agent for EPDM in the copresence of CBS and ZnO at 160°C. From the above results, the vulcanizing reaction was explained by the mechanism that, firstly, poly (triazine disulfide) formed is formed from triazine thiols and the copper mercaptides, and then vulcanization of EPDM with the disulfide is accelerated by both CMBT formed during vulcanization and ZnO.

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EMULSIFICATION OF LIQUID RUBBER AND APPLICATION TO ADHESIVE (PART 2)

Emulsification of Liquid Polyisoprene and Application to Adhesive

Koichi Yamaguchi, Jojiro Okumura, Tadashi Yokoyama, Shinzo Yamashita, ...

1984 Volume 57 Issue 10 Pages 630-642
Published: 1984
Released on J-STAGE: April 16, 2008

DOIhttps://doi.org/10.2324/gomu.57.630

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The emulsification of liquid rubber was investigated on various liquid polyisoprene, and the application to adhesive was carried out on its latex. It was confirmed that emulsifier used together sodium lauryl sulfate as anionic emulsifier and polyoxyethylene octhyl phenyl ether as nonionic emulsifier was effective for the emulsification of liquid polyisoprene, and latex obtained by this emulsifier was better the storage stability. Latex of liquid polyisoprene introduced a carboxyl group was found to able the appliation to adhesive with the corsslinking by acetic salts. Latex of liquid polyisoprene modified with the graft polymerization of methyl methacrylate and glycidyl methacrylate had high peel strength for the bond of plasticized poly (vinyl chloride), etc.

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[title in Japanese]

1984 Volume 57 Issue 10 Pages 654-655
Published: 1984
Released on J-STAGE: April 16, 2008

DOIhttps://doi.org/10.2324/gomu.57.654

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