摘要
为了进一步提高环氧胶粘剂的高温粘接强度和韧性,采用了一种新型固化剂DAMP与环氧胶粘剂配合使用,其结构中的脂肪环和醚链赋予环氧胶粘剂体系(DPE51胶)优异的耐高温性能和韧性.经测试,DPE51胶的固化放热峰在40℃左右,能够实现室温固化,室温下的凝胶时间达3h以上.固化物起始热分解温度达360℃,最大热失重速率对应温度为385℃,具有优异的耐热性能.室温拉剪强度达12MPa以上,150℃和200℃下的拉剪强度均保持在1.5MPa以上.DPE51胶的拉伸强度均在10MPa以上,断裂伸长率达到72%以上,在-40℃下,DPE51胶的断裂伸长率仍保持为3.9%,韧性优异.DPE51胶是一种高温粘接性能和韧性俱佳的高性能胶粘剂,有望在航空航天领域得到应用.
In order to further improve the thermal stability and toughness of epoxy adhesive,the DAMP is adopted as the curing agent for the first time due to its thermal stable alkyl ring and soft molecular chain with ether moieties.The curing temperature exothermic peak of the novel epoxy adhesive is around 40t,and it can be cure at room temperature.The adhesive exhibits excellent thermal stability with the 5%weight loss temperature of 360℃ and the temperature for the maximum weight loss rate is 385℃.Besides,the shear strength is above 12MPa at room temperature,which remains more than 1.5MPa at 150℃ and 200℃.The tensile strength is above 1OMPa and the elongation at break is above 72%.It is found that the elongation at break at-40℃ is still 3.9%,which exhibits a high ductility.The novel high performance epoxy adhesive is a promising candidate in the aeronautic and astronautic field.
作者
徐双双
常健
耿琼
王超
郭安儒
XU Shuang-shuang;CHANG Ji an;GENG Qiong;WANG Chao;GUO An-ru(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China;The Stale Key Lab of Metal Matrix Composites,Shanghai Jiao Tong University,200240,China)
出处
《化学与粘合》
CAS
2020年第2期92-95,共4页
Chemistry and Adhesion
关键词
耐高温
高韧性
环氧
胶粘剂
Heat-resistant
high ductility
epoxy
adhesive
