论文部分内容阅读
首先以淀粉为原料、多聚磷酸钠为酯化剂制得磷酸酯淀粉,然后采用反相乳液聚合法制备磷酸酯淀粉微球,并用马来酸酐对微球进行改性。通过单因素试验法探讨了m(淀粉)∶m(多聚磷酸钠)配比、乳化剂含量、交联剂含量和温度等因素对微球的形成和产率等影响,并对微球的结构、溶胀性和吸附性等进行了分析。结果表明:当m(淀粉+多聚磷酸钠)=10 g、m(淀粉)∶m(多聚磷酸钠)=60∶40、环氧氯丙烷(ECH)交联剂为5 g、乳化剂为0.10 g和反应时间为5.0 h时,微球产率相对最高;当Mn2+浓度为0.03 g/L时,磷酸酯淀粉微球、马来酸酐改性淀粉微球对Mn2+的常温吸附量分别为0.616、0.793 mg/g。
First, starch was used as raw material, sodium polyphosphate as esterification agent to obtain phosphate starch, and then phosphoric acid ester starch microspheres were prepared by inverse emulsion polymerization and the microspheres were modified with maleic anhydride. The effects of m (starch): m (sodium polyphosphate) ratio, emulsifier content, crosslinking agent content and temperature on the formation and yield of microspheres were discussed by single factor test. Structure, swelling and adsorption were analyzed. The results showed that when m (starch + sodium polyphosphate) = 10 g, m (starch): m (sodium polyphosphate) = 60:40, epichlorohydrin (ECH) Was 0.10 g and the reaction time was 5.0 h, the yield of microspheres was the highest. When Mn2 + concentration was 0.03 g / L, the adsorption capacity of phosphate ester starch microspheres and maleic anhydride modified starch microspheres to Mn2 + were 0.616, 0.793 mg / g.