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

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.