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以全氟烷基乙基丙烯酸酯(FEA)、苯乙烯(St)、丙烯酸丁酯(BA)、甲基丙烯酰氧乙基三甲基氯化铵(DAC)为共聚单体,异丙醇为溶剂,偶氮二异丁脒盐酸盐(AIBA)为水溶性引发剂,采用半连续无皂乳液聚合法制备含氟丙烯酸酯无皂乳液。系统研究了该含氟乳液作为表面施胶剂对纸张性能的影响,并通过红外光谱进行了表征,通过接触角和扫描电子显微镜进行了性能测试。结果表明,当m(St)∶m(BA)∶m(FEA)∶m(DAC)=3∶3∶2∶1.2,乳液含氟量达到20%时,纸张的防水防油性较佳,抗张强度提高22.3%,耐折度提高38.2%。 相似文献
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The synthesis process of N-acetyl-aspartyl-glutamate (NAAG) was studied, in which L-aspartic acid was used as the raw material, and the dipeptide was first prepared by esterification,acylation and the reaction with L-glutamic acid, and then the product NAAG was finally obtained by hydrolyzation and purification.The product and the intermediate were analyzed and identified by melting point measuring, elemental analysis, polarimeter and IR analysis.The effects of mixture ratio of raw materials, reaction temperature and reaction time were investigated.The results showed that the total yield was 50.02% when the esterification temperature was controlled at 20℃, esterification time 10 h, acylation temperature 70℃, acylation time 2 h, and DCC was used as the addition reagent to synthesize dipeptide.The hydrolization temperature was 60℃, the hydrolization time was 4 h.The product was purified by ion-exchange resin.The purity detected by HPLC was 97.5%. 相似文献
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