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在碱性条件下以对-特辛基苯酚与对-壬基苯酚或十二烷基苯酚的混合物与甲醛缩合反应得到混合烷基苯酚酚醛树脂缩合液,并将缩合液加入到熔融的松香中反应得到松香改性酚醛树脂。在苯磺酸类催化剂作用下,向松香改性酚醛树脂中加入多元醇进行酯化反应,再加入二元羧酸继续反应得到高档热固油墨用松香改性长链烷基酚醛树脂。对产物的结构进行了红外、热重分析表征。产物粘度18 000 m Pa·s左右,软化点151℃,庚烷值23.8 m L/2 g,酸值(KOH)22.4 mg/g,色泽7号,分子质量分散度分布11.64,适用于高档热固油墨,在高速轮转胶印过程中能明显提高轮转印刷效率,同时不存在乳化和飞墨现象。
Condensing the mixture of p-octylphenol with p-nonylphenol or dodecylphenol with formaldehyde under basic conditions to obtain a mixed alkylphenol novolak condensate, and adding the condensate to the molten rosin The reaction results in rosin modified phenolic resin. Under the action of benzenesulfonic acid type catalyst, polyol is added into rosin modified phenolic resin to carry out esterification reaction, and dicarboxylic acid is added to continue reaction to obtain rosin modified long-chain alkylphenol resin for high-grade thermosetting ink. The structure of the product was characterized by IR and TG. The viscosity of the product is about 18 000 mPa · s, the softening point is 151 ℃, the heptane value is 23.8 m L / 2 g, the acid value (KOH) is 22.4 mg / g, the color number is 7 and the molecular weight distribution is 11.64. Solid ink, in high-speed web offset printing process can significantly improve the efficiency of web printing, while there is no emulsion and flying ink phenomenon.