NBR增稠增韧α-氰基丙烯酸乙酯胶粘剂

Study on thickening and toughening modification of ethyl α-cyanoacrylate adhesive with NBR

以拉伸剪切强度、冲击剪切强度和光学相衬显微镜考察了丁腈橡胶(NBR)的含腈量、薄通次数以及加入量对α-氰基丙烯酸乙酯胶粘剂的表观粘度、胶接接头的力学性能和微观结构的影响。结果表明,NBR增稠效果明显,腈含量少的NBR增稠效果更佳,但随相对分子质量减少效果渐降;NBR增韧也显著,中腈含量的NBR增韧效果最好;薄通次数为40次,NBR26质量分数为9%的改性α-氰基丙烯酸乙酯胶粘剂中的NBR的粒径为5～20μm,并均匀分散于聚合物基体中,大大的提高了改性α-氰基丙烯酸乙酯胶粘剂的冲击剪切强度和粘度,它们分别是原来的11倍和250倍左右。

The effect of mass fraction of acrylonitrile and relative molecule mass of NBR on the apparent viscosity of α-cyanoacrylate adhesive and the tensile shear strength, impact shear strength of the adhesive adhint was investigated. The micromorphology of cured modified α-adhesive was observed by photomicrograph. The result showed that the less the mass fraction of acrylonitrile in NBR was, the better the thickness was. But the less relative molecule mass of NBR was on the contrary in thickness. The thickening and toughening properties of α-adhesive was obviously improved by blending 9% of NBR, with acrylonitrile mass fraction 26%, milling 40 times, and the diameter of the particle of NBR 26 was 5-10 μm.