Analysis of the properties for epoxy curing agents with reactivity and toughening
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摘要: 以壬基酚和甲醛所形成的二聚体为原料,合成了一种新型结构的环氧固化剂双(2-羟基-3 -胺乙基胺甲基-5-壬基苯基)甲烷(BA),利用红外光谱(IR)、核磁共振谱(1HNMR)表征了产物结构.通过差 示扫描量热(DSC)研究了该固化剂的反应活性,确定固化剂最佳质量分数为43.19%.固化 树脂动态力学分析(DMA)表明,由于BA分子结构中存在正壬基,固化后会发生β- 松弛, 能够提高树脂韧性.力学性能测试发现BA固化树脂的冲击强度比普通芳香胺固化树脂提高了 36.91％,证明BA具有高活性和增韧双重效果.Abstract: A type of novel epoxy curing agent, Bis(2-hydroxy-3-amidoethylaminemethyl-5 -nonylphenyl) methane(BA) was synthesized from dimer which was obtained from n onylphenyl and formaldehyde. The structure of this curing agent was attributed b y IR and 1HNMR. The reactivity of the curing agent was investigated by using the differential scanning calorimetry(DSC), and the optimum content of BA used in c uring process was definited at 43.19% in weight. From the results of dynamic mec hanical analysis(DMA), the β- relaxation contributed by the nonyl of BA was con firmed, which increased the toughness of the cured resins. The results of mechan ical performance test demonstrates that the impact strength of the resins cured by BA was 36.91% higher than that of the resins cured by normal aromatic amine. In conc lusion, BA is a elasticizer and active curing agent for epoxy resins.
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Key words:
- curing agents /
- epoxy resins /
- reactivity /
- toughening
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