Discoloration Phenomenon Induced by the Combination of Phenolic antioxidants and Hindered Amine Light Stabilizers

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  • KIKUCHI Takako
    Chemicals Evaluation and Research Institute, Japan Department of Automotive Science, Kyushu University
  • OHTAKE Yoshito
    Chemicals Evaluation and Research Institute, Japan
  • TANAKA Keiji
    Department of Automotive Science, Kyushu University Department of Applied Chemistry, Kyushu University

Bibliographic Information

Other Title
  • フェノール系酸化防止剤と光安定剤の併用に伴う変色現象
  • フェノールケイ サンカ ボウシザイ ト ヒカリ アンテイザイ ノ ヘイヨウ ニ トモナウ ヘンショク ゲンショウ

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Abstract

Additives are generally mixed into polymeric materials to extend their lifetimes. However, the mixing of multiple additives may cause a negative synergy effect such as discoloration behaviors. We here report how the discoloration of a typical phenolic antioxidant, 2,6-di-tert-butyl-4-methylphenol(BHT), is promoted under the presence of hindered amine light stabilizers(HALS) on the basis of a temperature accelerated test. When BHT was used with HALS in n-decane solution at higher temperatures, quinone methide and stilbenequinone were produced via the oxidation of BHT, which can be catalyzed by titanium dioxide. This eventually leads to the discoloration of the reaction system. Interestingly, the discoloration phenomenon was further proceeded with increasing concentration of HALS and strength of HALS basicity. Similar results could be obtained even in polymer materials.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 85 (9), 283-288, 2012

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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