新型结构粘接材料对航空有机玻璃性能的影响

选用新型结构粘接材料中低温固化环氧结构胶膜J-351和改性丙烯酸酯液体胶胶黏剂SY-50s,表征胶黏剂对有机玻璃的粘接性能以及应力-溶剂银纹性能,并研究胶黏剂对有机玻璃力学性能的影响。结果表明:两种胶黏剂对有机玻璃具有良好的粘接性能,J-351抗应力溶剂银纹性能优于SY-50s;有机玻璃表面施胶后力学性能下降,与定向有机玻璃相比,浇注有机玻璃力学性能下降更为明显。通过对拉伸试样断口形貌分析发现,拉伸试样带有胶黏剂的一侧首先发生破坏。因SY-50s与有机玻璃界面结合紧密,导致带有SY-50s胶黏剂的有机玻璃力学性能下降程度较大;而J-351环氧胶膜与有机玻璃界面清晰,对有机玻璃力学性能影响相对较小。因胶黏剂对有机玻璃性能的影响,导致采用SY-50s胶黏剂粘接的试样边缘连接强度低于J-351胶黏剂粘接的试样,新型结构粘接材料J-351环氧胶膜在有机玻璃粘接中应用性能良好。

Effects of Novel Structure Bonding Materials on Properties of Aeronautical Acrylic

Novel structure bonding materials,J-351 epoxy adhesive film with low curing temperature and liquid modified acrylate SY-50s adhesive were chosen and characterized.The effects of adhesives on the mechanical properties of acrylic were studied.The results reveal that both adhesives have excellent bonding properties to acrylic.The stress-solvent crazing value of J-351 is higher than that of SY-50s.With the application of adhesive on the surface,mechanical properties of acrylic are declined.Casting acrylic shows more drastic decline than that of oriented acrylic.Through the characterization of fracture surface,we find that fracture of tensile sample derives from the side with adhesive.Mechanical properties of acrylic are more sensitive to SY-50s,because the liquid adhesive presents integrate bonding interface with acrylic.The interface between J-351 and acrylic is clear,making acrylic insensitive to J-351 film.Edge attachment strength of samples bonded with J-351 are higher than that of samples bonded with SY-50s due to the effects of adhesives on acrylic.J-351 epoxy adhesive film presents preferable application performance in the structure bonding of aeronautical acrylic.