模拟漆酶——Ⅱ.铜和弱碱性苯乙烯系阴离子交换树脂的复合物Cu-D37O催化漆酚氧化聚合成膜的研究

SIMULATION OF LACCASE ——Ⅱ.STUDIES ON THE OXIDATIVE POLYMERIZATION OF URUSHIOL TO COATING, CATALYZED BY THE CUPRIC COMPLEX WITH WEAKLY ALKALINE ANION-EXCHANGE RESIN OF POLY- STYRENE SERIES Cu-D370 SIMULATING LACCASE

本文研究了Cu-D370催化漆酚氧化聚合成膜的反应条件和产物性能。Cu-D370的含铜量超过5％时才有正常的催化活性。与漆酚相反,Cu-D370催化活性随升温而加快,89℃时不失活,而且其底物漆酚出现沉淀的时间比70℃或45℃时出现短。粗产品数均分子量(Mn)为3420,分子量分布窄。分离出残余漆酚和低聚物之后,其漆膜实干时间不到1天。漆膜物理性能优异,与“超级生漆膜”类似。漆膜的耐热性和耐化学品性与普通生漆差不多。

Reaction conditions and product properties of the oxidative polymerization and cross-linking of urushiol, catalyzed by Cu-D370, were studied. Cu-D370 reached its normal catalytic activity only when Cu content was more than 5%. In contrast to laccase, the catalytic activity of Cu-D370 increased along with the rise of temperature up to 89℃ and precipitation time of its substrate urushiol at 89℃ was shorter than that at ,70℃ or 45℃. The average molecular weight (Mn) of crude product was 3420 and its molecular weight distribution was narrow. After separating residual urushiol and low-molecular polymer from it, the dry hard time of its paint was less than one day. Physical properties of the urushi film made of the product were excellent and similar to those of 'super urushi film'. Heat resistance and chemical resistance of the paint were fairly close to those of ordinary urushi film.