Investigation of New Crosslinking System for Phenolic Resin

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  • カチオン付加反応によるフェノール樹脂の新規硬化システム (1)
  • カチオン フカ ハンノウ ニヨル フェノール ジュシ ノ シンキ コウカ シス

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Description

A new method to cure phenolic resin is described. Novolac resins diluted with a multifunctional-reactive-solution-type-compound such as divinylbenzene, can be cured by adding Lewis acids (i.e., aluminum chloride) or protonic acids (i.e., sulfonic acid) as a curing catalyst. There are discussed such things as the effective types of novolac resins, mixing ratios, the evaluation of cured compounds, the reaction mechanism, and the analysis of structure. While conventional novolacs have low compatibility with divinylbenzene, low molecular weight resins with a high ortho-oriented structure shows very good solubility, thus forming a homogeneous solution with low viscosity (a liquid component). The liquid component can be cured by adding cationic catalyst at RT or higher. The addition of the vinyl group in divinylbenzene to the activated site in the phenolic nuclear enables the cure to proceed without gas formation. This makes easy to handle the resin. Properties of the cured resin are well balanced, especially enhanced in mechanical strength, heat resistance, and waterproofing. Also the resistance to alkalis, which is lacked in the conventional phenolic resins, is excellent. The phenolic resin with the new curing system, therefore, is highly expected to be used in various application fields.

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