… Phenolic resins are divided into two types according to the manufacturing method. (1) Phenol is reacted with formaldehyde in the presence of an acid catalyst to produce a thermoplastic, solvent-soluble resin (called novolac) in which the phenol is slightly condensed. Next, fillers such as pulp or wood flour, condensation agents such as hexamethylenetetramine (which generates formaldehyde when heated), other catalysts, colorants, modifiers, etc. are added to this resin, mixed, and heated to harden it into a molded product (Figure). … *Some of the terminology explanations that mention "novolac" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… フェノール樹脂はその製法によって次の2種類にわかれる。(1)フェノールを酸触媒のもとでホルムアルデヒドと反応させ,フェノールが若干個縮合した熱可塑性,溶剤可溶の樹脂(ノボラックnovolacという)をまずつくる。次いでこの樹脂に,パルプ,木粉などの充てん(塡)剤,ヘキサメチレンテトラミン(加熱によりホルムアルデヒドを発生する)などの縮合剤,その他触媒,着色剤,変性剤などを加え,混合,加熱硬化させて成形品とする(図)。… ※「novolac」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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