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Volume 68, Issue 3
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[in Japanese], [in Japanese]1995 Volume 68 Issue 3 Pages 143-155
Published: 1995
Released on J-STAGE: July 09, 2007
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[in Japanese]1995 Volume 68 Issue 3 Pages 156-165
Published: 1995
Released on J-STAGE: July 09, 2007
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[in Japanese]1995 Volume 68 Issue 3 Pages 166-168
Published: 1995
Released on J-STAGE: July 09, 2007
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[in Japanese]1995 Volume 68 Issue 3 Pages 169-170
Published: 1995
Released on J-STAGE: July 09, 2007
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RELATIONS BETWEEN BIT AND CARBON BLACK DISPERSIONNobuaki URABE, Hiroshi TAKATSUGI, Michio ITO, Hideo TOKO, Masahiko FUK ...1995 Volume 68 Issue 3 Pages 171-177
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThere are two opposite theories about the second peak in the voltage-time curve occurs when carbon black mixed in the internal mixer. The one is regarded as the dispersion process already completed, and the other is only the incorporation process almost proceeded, so the dispersion process further proceeds. We focused on the results of SBR-carbon system that the BIT is much affected by the addition of zinc oxide. As the results of this investigation, it was found that the latter theory is reasonable, even if in the case of the long BIT that the dispersion seems to be completed. Increasing the water supply temperature to mixer, the BIT was reduced and the dispersion became to be inferior. By addition of magnesium oxide or calcium hydroxide, the BIT is reduced but the dispersion became not to be superior. Whereas by addition of zinc oxide, it was found that we could reduce the BIT at low temperature and also highly improve the dispersion.View full abstractDownload PDF (866K) -
Sadafumi YAGI, Naomi MASUDA, Nobutoshi TSUTSUMI, Tatsuya HONGU, Toshik ...1995 Volume 68 Issue 3 Pages 178-185
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSPolyurethane resins containing metallophthalocyanine rings (M-Pc, M=Co(II)) in the chain were synthesized and their propreties were investigated. These polyurethane resins were prepared by the copolyaddition of 1, 6-hexane diisocyanate(HDI), 1, 6-hexanediol, and Co(II)-phthalocyanine bis- or tetrakis (hydroxy carboxylate) derivertives obtained from Co(II)-phthalocyanine bis or tetra carbonyl chloride and ethyleneglycol, 2-hydoroxyetoxyethyl, 1, 6-hexanediol, and p, p′-biphenol. Thermal decomposition temperature for the copolyurethane resin was raised more than 50°C by the introduction of Co(II)-phthalocyanine into the polymer. From the result of Xray diffraction analysis, it was appeared that the stable phase-separated structure of the resins containning Co(II)-phthalocyanine was obtained by annealing from over the melting temperature. The copolyurethanes could be processed into various products such as fibers and films.View full abstractDownload PDF (853K) -
Shigemitsu OTOMO, Yoshitomo YAMAMOTO1995 Volume 68 Issue 3 Pages 186-192
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSAmine Antioxidants substituted with naphthyl group (NAA) have been prepared as heat stabilizer, and their antioxidation activities for low density polyethelene (LDPE) have been evaluated by TG/DTA curve. N, N′-Dinaphthyl-p-pheny lenediamines (NA-1, 2) have showed the highest antioxidation activity and the activity of N, N′, -diphenyl-1, 5-naphthalenediamine (NA-3) has been found to be good, too. On the other hand, the activities of N-2-naphthyl-N′-phenlyl p-phenylenediamine (NA-4) and N, N′-di-2-naphthyl-p, p′-oxybisaniline (NA-5) have proved to be poor. These results indicate that the excellent antioxidation activities of NA-1, 2 may be due to the stabilization of amino radicals formed from NA-1, 2 by the resonance effect of naphthyl group and by the formation of benzoquinonediimine, as shown in Fig. 2.
The combination effects of 4-anilino-p-toluenesulfonanilide (TSA) and peroxide decomposing antioxidants on the heat resistance of LDPE have been studied, too. Though the synergistic effects between them have not been observed, the unique combination effect between TSA and aryl arylphosphonite (D-3) has been observed. The possible examination for that effect is outlined in Fig. 5.View full abstractDownload PDF (651K) -
Shujiro SHIGA, Naoyuki OKA1995 Volume 68 Issue 3 Pages 193-196
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe relation between mixing times and dielectric constants of rubber compounds is investigated as a step of the series studies on compound properties vs. mixing. Using an impedance analyser, capacitances are measured with appreciable reproducibility for the compound sheets by a Brabender Plastgraph and a press where the same recipe materials as used in our study of the EPR-processability indices are mixed and pressed. When plotted against mixing times with semilogarithmic expression, the curves of the dielectric constants calculated by the capacitances shows such bending points as in the case of electrical conductivities reported somewhere, whreas the constants at 30s are 2-3 times larger than those at 10min, and steeper decreases until the minimum compounding times are characteristic to the curves in cooperation with the milder changes after the times. It suggests suitability ofthe dielectric measurement for mixing level estimation. The theoretical backborn is not clear. It might be noted that the similar phenomenon are known in W/O emulsions.View full abstractDownload PDF (540K) -
Takashi WATANABE, Ryoji YAMAGUCHI1995 Volume 68 Issue 3 Pages 197-202
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSFor the purpose to develope the non-nitrosamine type vulcanizing agents, bis cyclic amide disulfides, non-nitrosamine type bisamine disulfides and non-nitrosamine type thiuram di, polysulfide derivatives were synthesized and its sulfur and EV vulcanization performance were investigated.
The results are as follows;
1) In the case of EV vulcanization by bis cyclic amide disulfides, all these sulfides shortened the scorching times against the blank test as compared with ordinary bisamine disulfides delay a scorching time against a blank test. This was affected by the carbonyl groups in the molecule and the effect in vulcanization (scorching time, vulcanizing time, performance of vulcanization) was increased with the number of its groups.
2) In the case of non-nitrosamine type bisamine disulfides, dibenzylamine derivaties (DBADS) and 2, 6-dimethylpiperidine derivatives (DMPDS), same as a commercially available dithio dimorpholine (DTDM), prolonged the scorching time against the blank test and gave the high performance of vulcanizatin, so it was realized the performance of non-nitrosamine type vulcanizing agents instead of DTDM.
3) In the case of EV vulcanization by thiuram disulfide (DMPTD) and thiuram polysulfide (DMPTP) of non-nitrosamine type 2, 6-dimethylpiperidine, these vulcanization performance were almost as same as its piperidine thiuram disulfide (PipTD) and polysulfide (PipTP) [DPTT] as a comparative sample and were realized to be used instead of DPTT.
Also in a sulfur vulcanization, DMPTP performed the same effect as DPTT without the influence of 2, 6-dimethyl group. And we realized that these thiuram polysulfides had bette effect for performance than the thiuram disulfides.View full abstractDownload PDF (661K) -
[in Japanese]1995 Volume 68 Issue 3 Pages 203-204
Published: 1995
Released on J-STAGE: July 09, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (247K)
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