羧甲基壳聚糖/苯甲酸金属盐的制备及其防污性能研究

Preparation of carboxymethyl chitosan/benzionic salt and study of its antifouling ability

无毒或低毒防污剂是环境友好型防污涂料开发的关键。以无毒或低毒的羧甲基壳聚糖、苯甲酸钠等为主要原料,制成了羧甲基壳聚糖/苯甲酸铜盐、羧甲基壳聚糖/苯甲酸锌盐、羧甲基壳聚糖/苯甲酸铋盐3种在环境友好型防污涂料中具有应用前景的高分子金属盐,通过红外谱对其进行结构表征;通过对新月菱形藻的半数致死浓度、生长抑制曲线及实海挂板试验研究了其防污性能,3种化合物的LC50分别为75.98、28.52、437.85mg/L;防污性能测试表明含有苯甲酸的羧甲基壳聚糖盐防污能力好于含同种金属离子但不含苯甲酸的羧甲基壳聚糖盐,防污性能表现为CMC-Cu-B>CMC-Zn-B>CMC-Bi-B。

Three kinds of carboxymethyl chitosan benzionic salt（CMC-M-B） which could be employed as environmentally friendly antifouling agent were synthesized and their structure were also characterized employing infrared ray.Their antfouling ability was studied through laboratory experiments,median lethal concentration and the growth inhibition curve to algea Nitzschia closterium,and field experiments,testing antifouling panels in shallow submergence.The LC50 value of carboxymethyl chitosan benzionic copper salt（CMC-Cu-B） and carboxymethyl chitosan benzionic zinc salt（CMC-Zn-B） and carboxymethyl chitosan benzionic bismuth salt（CMC-Bi-B） are 75.98,28.52,437.85mg/L respectively.The test results also show they are all effective in preventing the protected surface from fouling and the carboxymethyl chitosan salt containing benzoic acid root are more effective than those free benzoic acid root.Their antifouling ability are arranged in the following order： CMC-Cu-B〉CMC-Zn-B〉CMC-Bi-B.