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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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木质素基阴-阳离子表面活性剂的制备及用作农药水悬浮剂分散剂
DOI: 10.11777/j.issn1000-3304.2015.15094, PP. 1414-1420
Keywords: 木质素磺酸钠聚氧乙烯醚,阴-阳离子表面活性剂,静电自组装,分散剂,膏化
Abstract:
以木质素磺酸钠(SL)为原料,通过亲电取代反应将聚乙二醇(PEG600)接枝到SL分子中制得木质素磺酸钠聚氧乙烯醚(SL-PEG).对SL-PEG进行结构表征,发现SL-PEG分子中含有较多的聚氧乙烯醚结构单元,重均分子量最大达到32900;接枝反应主要发生在SL的酚羟基上,其酚羟基含量由1.17mmol·g-1下降至最小0.30mmol·g-1.将SL-PEG与十六烷基三甲基溴化铵(CTAB)通过静电自组装方法制备木质素基阴-阳离子表面活性剂CA-SL.分别研究CA-SL的表面活性和溶液行为,发现CA-SL可使水溶液的表面张力降低至38.75mN·m-1,其在水溶液中的临界聚集浓度可达0.0050~0.0065g·L-1,远低于SL.将CA-SL作为分散剂制备吡虫啉和烯酰吗啉水悬浮剂,考察其分散稳定性能.结果表明,CA-SL具有良好的砂磨及分散效果,在热贮过程中能有效遏制2种悬浮剂的膏化和颗粒粗化现象,悬浮剂的稳定性良好.
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