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以异佛尔酮二异氰酸酯(IPDI)为原料,制备以IPDI三聚体为主要成分的交联剂。通过对催化剂种类、用量及加入方法、反应温度等因素的探索和研究,获得了合成IPDI三聚体交联剂的基础配方。利用红外光谱、核磁共振等方法对三聚体产物结构进行表征。 相似文献
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研究了异佛尔酮二异氰酸酯(IPDI)三聚体的合成工艺。讨论了月桂醇用量、转化率及三聚反应温度对三聚体性能的影响。该三聚体在分离游离IPDI后,各项性能指标符合设计要求。 相似文献
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分别简便制备了六亚甲基二异氰酸酯三聚体与乙醇、丁醇和乙二醇单丁醚的封闭物 ,考查了它们与醇酸、丙烯酸树脂的混溶性及在醇酸氨基烤漆和聚氨酯涂层中的增塑性能 ,试验结果表明 :三个封闭物可以作增塑剂使用。 相似文献
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Isophorone diisocyanate was used as a chain extender to coupling the soft segment water-borne polyester with the hard segment water-borne polyester, to overcome the disadvantages of low molar mass and poor mechanical properties of waterborne sulfonate-containing polyesters. The molecular structure of the extended polyester was confirmed by FTIR and 1H NMR, and the increased molar mass of the resultant was characterized by SEC. The extended products could be dispersed in water with the emulsion particle size less than 50 nm in diameter, slightly larger than that of precursors of soft- and hard-segment polyesters. The emulsion viscosity of polyesters after the chain extension was lower when the emulsion concentration was not larger than 25 wt%, which is conducive to the spraying application of the polyester for coating. DSC analysis indicated that the polyester after chain extension had two different glass temperatures, suggesting that the polyester bulk had a microphase separation structure. The mechanical performance of the coupled polyester manifested an obviously improved elongation at break and had a feature of higher elastic recovery rate. The results of this study indicate that the chain extension is an effective method to increase the molar mass and improve mechanical properties of waterborne polyesters. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48453. 相似文献
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研究了由3-苯甲酰丙烯酸乙酯和L-丙氨酸苄酯对甲苯磺酸盐缩合并用Pd/C催化加氢还原合成N-[(S)-1-(乙氧羰基)-3-苯丙基]-L-丙氨酸,再用双(三氯甲基)碳酸酯进行酰氯化,最后与L-脯氨酸直接缩合成盐获得马来酸依那普利的新方法.产品总收率为50%.对产品结构进行了表征. 相似文献
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以丙二腈为起始原料通过两步反应合成了3,3,3-三甲氧基丙腈,气相色谱分析产物纯度达到98.08%。采用气质联用、红外光谱、核磁共振氢谱对产物进行了表征。确定了第一步合成甲基氰基乙酰亚氨基盐酸盐的最佳反应条件为:溶剂含水量〈100×10-6^、通气时间3h、72g丙二腈、45mL甲醇、1440mL乙醚、常温搅拌时间7h;第二步合成3,3,3-三甲氧基丙腈的最佳反应条件为:甲基氰基乙酰亚氨基盐酸盐与甲醇的物料比为1g:7.35mL、搅拌时间24h、在反应i0h后移出副产物氯化铵、无水硫酸钠作为干燥剂。 相似文献