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Phenyl glycidyl ether was used to react with solid metaphenylene diamine (MPDA) to produce N-(3-phenoxy-2-hydroxypropyl)-1,3-benzenediamine (NPHB). MPDA was intentionally formulated to have an excessive amount to obtain a new liquid MPDA–NPHB mixture. The mixed curing agent was indicated to have a few advantages over MPDA. The mixed curing agent was then used to cure diglycidyl ether of bisphenol A as cryogenic epoxy adhesive. The effects of the MPDA–NPHB content were systematically studied on the impact strength and shear strength at both room temperature and cryogenic nitrogen temperature of the epoxy adhesive. Moreover, two coupling agents with various contents were used to further enhance the shear strength of the optimal cryogenic epoxy adhesive. Finally, differential scanning calorimetry analysis showed that the modified adhesive showed a higher glass transition temperature than the unmodified adhesive. 相似文献
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以改性环氧树脂(EP)与改性芳香胺固化剂为原料制备铅酸蓄电池极柱灌封用密封胶,着重研究了改性EP与固化剂的配比对胶粘剂性能的影响。实验结果表明,改性EP与固化剂配比对胶粘剂的初步固化时间、热变形温度、剪切强度和拉伸强度的影响显著;3种配比的胶粘剂耐酸碱性能均较好;当m(改性EP)∶m(固化剂)=100∶50时胶粘剂的综合性能最优,其初步固化时间为6 h、热变形温度为97℃、拉伸强度为72 MPa、剪切强度为3.56 MPa且对ABS的粘接达到材料破坏的程度。该胶粘剂室温固化具有一定的适用期,并具有良好的粘接性能、耐久性能和耐酸性能,可以满足蓄电池极柱灌封和粘接的技术要求。 相似文献