日本ゴム協会誌
Print ISSN : 0029-022X
79 巻, 6 号
選択された号の論文の9件中1~9を表示しています
  • 高取 永一, 有我 望
    2006 年 79 巻 6 号 p. 297
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
  • 中村 知之
    2006 年 79 巻 6 号 p. 298-303
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
    Organic peroxides (PO) are used as crosslinking (vulcanizing) agents. Free radicals generated from PO can abstract hydrogens from saturated rubbers such as polyethylene, ethylene-propylene-diene terpolymer and highly hydrogenated acrylonitrile-butadiene rubber to form intermolecular C-C bonds. The crosslinking using PO is effective for the improvement of heat resistance of rubber, and therefore, the technique becomes much important especially in automotive applications. The thermal decomposition rates, mechanisms and products for several kinds of PO are reviewed. Dicumyl peroxide (DCP) is a most typical and widely used crosslinking agent. However, acetophenone derived from DCP as a decomposition product sometimes causes a smell problem of rubber. α, α'-Bis (t-butylperoxy)-1, 3-diisopropylbenene is used as the substitute for DCP, because it has almost same activity as DCP and generates less smell products. The radical generation efficiency of 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane (HXA) is lower than that of 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexyne-3 because of less hydrogen abstracting ability of the alkyl radical generated from β-scission of the intermediate t-alkoxy radical of HXA. t-Butylperoxy-2-ethylhexyl monocarbonate is low temperature active and has high hydrogen abstracting ability, and then it is used as the substitute for 1, 1-di (t-butylperoxy) cyclohexane.
  • 有我 望
    2006 年 79 巻 6 号 p. 304-311
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
    Sulfur vulcanization was enabled by the combination of sulfur, zinc oxide and vulcanization accelerator. There are many kinds of vulcanization accelerators. Rubber products are produced by a combination of vulcanization accelerators in consideration of characteristics of them.
    This paper presents about the basics of sulfur vulcanization agents and the regulation for an environment.
  • 林田 隆博
    2006 年 79 巻 6 号 p. 312-315
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
    The rubber industry is frequently confronted with processing problems resulting in bad distribution of components, low quality or even unemployable rubber compounds.
    Reasons can be oxidative damage of the rubber because of extended storage or insufficient rubber stabilization, as well as oxidative cross-linking during mixing due to severe processing conditions. Standard rubber antidegradants such as TMQ and PPDs have a limited contribution to processing stability.
    Specially optimized rubber processing stabilizers can reduce the problems caused by oxidative reactions during compounding. With these specially formulated antidegradant systems, it is possible to make black, natural or coloured compounds with a reduced tendency of gel formation in a broader temperature range.
    Additionally, these fully formulated antidegradant systems can be employed in silica filled rubber compounds, e. g., tire treads, while, again broadening the processing window, reducing premature cross-linking, and reducing compound viscosity and hence compound temperature during mixing.
    This article will cover new technology for improved processing and storage stability of rubber compounds, and offer information on recent advances in products that will allow for reduced scorching and higher temperature processing.
  • 西沢 仁
    2006 年 79 巻 6 号 p. 316-322
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
    Flame retardant materials have been increased in many application field lately. There are many regulations of flame retardant materials in the world such as WEEE, RoHS, UL, CSA and AS speci-Fications.
    Recently in these requirement, not only flame retardant properties but also enviromental safety are included and must take care of these inclination to select the flame retardant agents.
    I introduced the typical flame retardant regulation in EU and Japan, and the present situation of flame retardant agents in this paper.
    The role of flame retardant mechanisms to develop new agents should now be reconsidered again.
  • 宝永 嘉男
    2006 年 79 巻 6 号 p. 323-329
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
    Over the past two decades or so, the necessity of processing aids has been certainly recognized in the domestic use for rubber processing. Obviously, this is because many end-users have found that they can lower the defect rates of rubber products, improving their quality, and some of them have also noticed their additional contribution to reduction of production cost attributed to decreased power consumption. On the other hand, processing aids within filled rubbers have significant effects on polymers at the molecular level and on the nano-sized fillers. In this article, we will state the role and action of only lubricants, comprised of fatty acid derivatives, in mixing and extrusion processes, and also present part of certain performance data for a most recently marketed lubricant effective for better silica dispersion in a silica filled compound.
  • 高取 永一, 香川 信之
    2006 年 79 巻 6 号 p. 330-334
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
    Plastics usually contain several spieces of additives. In this review we presented the analytical methods for organic additives in plastics, which were published through technical papers. We described the examples of analysis in the most conventional polymers such as Polyethylene and Polyvinylchrolide.
  • 菊地 貴子, 大武 義人
    2006 年 79 巻 6 号 p. 335-341
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
    Rubber products contain some kinds of additives such as vulcanizing agents, crosslinking agents, vulcanization accelerators, antioxidants, plasticizers, flame retardants and fillers.
    In general, when we perform the analysis of rubber products, additives are extracted from rubber products at the first step. Therefore, it is very important to select a extraction method in the preparation, for example the solvent extraction, SFE, the thermal extraction. The extracts that contain various additives is analyzed by Chromatography such as TLC, GC/MS and LC/MS at the second step. We suggest same preparation and chromatographic analysis involving TLC, GC/MS and LC/MS
  • 高取 永一, 有我 望
    2006 年 79 巻 6 号 p. 342-343
    発行日: 2006/06/15
    公開日: 2010/03/12
    ジャーナル フリー
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