Study on the Effect of Reaction Conditions for In Situ Silica Reinforcement of Styrene-Butadiene Rubber by Sol-gel Process in the Latex.

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  • YOSHIKAI Kazumasa
    Chemical and Textile Industry Research Institute, Fukuoka Industrial Technology Center
  • OHSAKI Tetsuro
    Chemical and Textile Industry Research Institute, Fukuoka Industrial Technology Center
  • SUEYOSHI Azusa
    Department of Chemical Engineering, Faculty of Engineering, Fukuoka University

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Other Title
  • ゾル‐ゲル法によりＳＢＲラテックス中で合成したシリカの粒子径と補強効果に及ぼす反応条件の影響
  • ゾル ゲルホウ ニ ヨリ SBR ラテックス チュウ デ ゴウセイ シタ シリカ ノ リュウシケイ ト ホキョウ コウカ ニ オヨボス ハンノウ ジョウケン ノ エイキョウ

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Abstract

Silica reinforcement of styrene-butadiene rubber(SBR) was carried out by sol-gel method using tetraethoxysilane(TEOS) in the SBR latex. Latex, TEOS, water and catalyst were mixed at room temperature, and the sol-gel reaction was conducted at 20, 40, 60°C. After conducting the sol-gel reaction, the system was held at 80°C for 8hrs under vacuum to remove water, alcohol and TEOS. The composite doped with the in situ silica was subjected to the vulcanization at 150°C. The effect of various reaction conditions (the amount of added TEOS, the amount of added catalyst, the molar ratio of TEOS and water in the mixture([H2O]/[TEOS]), the reaction temperature, the reaction time) on the particle size and reinforcing behavior of silica were discussed using the results of tensile test and SEM observation of the vulcanizates. Particle size of silica was greatly influenced by both the amount of added TEOS and [H2O]/[TEOS]. By controlling the conditions, finely dispersed silica particles, whose diameter was smaller than 100nm, were generated in the composites. Tensile modulus of composites was simply increased with increasing the silica content. Particle size of in situ silica did not so much influence the tensile modulus, but did the tensile strength at break.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 73 (3), 144-151, 2000

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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