The acetoacetyl group can be used to improve superabsorbent resins since it is more active than the hydroxyethyl group. The acetoacetyl group can be introduced into the side group of hydroxyethyl cellulose (HEC) to a...The acetoacetyl group can be used to improve superabsorbent resins since it is more active than the hydroxyethyl group. The acetoacetyl group can be introduced into the side group of hydroxyethyl cellulose (HEC) to activate HEC using the ester exchange reaction between HEC and ethyl acetoacetate (EAA) to improve HEC grafting. This paper discusses the main factors affecting the reaction, such as the amount of EAA and catalyzer, the reaction temperature, and the reaction time. The acetoacetyl group was successfully introduced into HEC. Within specified ranges, increasing the amount of EAA, the reaction temperature and the reaction time will increase the acetoacetylation.展开更多
以TDI(甲苯二异氰酸酯)为交联剂、PVA(聚乙烯醇)为基体、HEC(羟乙基纤维素)为增黏剂和非离子型表面活性剂,制备了改性PVA白色乳胶。着重探讨了交联反应的原理和合成方法,并采用正交试验法优选出制备该乳胶的最佳工艺条件。研究结果表明:...以TDI(甲苯二异氰酸酯)为交联剂、PVA(聚乙烯醇)为基体、HEC(羟乙基纤维素)为增黏剂和非离子型表面活性剂,制备了改性PVA白色乳胶。着重探讨了交联反应的原理和合成方法,并采用正交试验法优选出制备该乳胶的最佳工艺条件。研究结果表明:当PVA用量为10 g/100 m L、HEC用量为1.2 g/100 m L、TDI用量为4 m L/100 m L、反应温度为40℃和反应时间为45 min时,所得乳胶无毒、无害、无刺激性气体逸出,并且具有良好的粘接性能、冻融稳定性、储存稳定性和施工性能,可作为木材加工、纸品加工和建筑装饰用胶粘剂。展开更多
文摘The acetoacetyl group can be used to improve superabsorbent resins since it is more active than the hydroxyethyl group. The acetoacetyl group can be introduced into the side group of hydroxyethyl cellulose (HEC) to activate HEC using the ester exchange reaction between HEC and ethyl acetoacetate (EAA) to improve HEC grafting. This paper discusses the main factors affecting the reaction, such as the amount of EAA and catalyzer, the reaction temperature, and the reaction time. The acetoacetyl group was successfully introduced into HEC. Within specified ranges, increasing the amount of EAA, the reaction temperature and the reaction time will increase the acetoacetylation.
文摘以TDI(甲苯二异氰酸酯)为交联剂、PVA(聚乙烯醇)为基体、HEC(羟乙基纤维素)为增黏剂和非离子型表面活性剂,制备了改性PVA白色乳胶。着重探讨了交联反应的原理和合成方法,并采用正交试验法优选出制备该乳胶的最佳工艺条件。研究结果表明:当PVA用量为10 g/100 m L、HEC用量为1.2 g/100 m L、TDI用量为4 m L/100 m L、反应温度为40℃和反应时间为45 min时,所得乳胶无毒、无害、无刺激性气体逸出,并且具有良好的粘接性能、冻融稳定性、储存稳定性和施工性能,可作为木材加工、纸品加工和建筑装饰用胶粘剂。
