The Research Of Improving Adhesive Capability Of Epoxy With Nanoparticle (SiO₂)

The Epoxy is extensively used as the adhesive, which possesses much of fine capability such as mechanical capability, electric capability, chemical capability and adhesive capability etc. The higher and more requirements of its capability are wanted in application, and we hope that the mechanical performance and the heat-fast performance are improved whenever enhancing adhesive toughness. One available method to increase tenacity of Epoxy is to add rubber to Epoxy with the cost of descending material intensity and stiffness, the other is to adopt the filler whereas the toughness is lower. The effective modified method is to add nanomaterial into Epoxy. As many none pair atoms are on the surface of nanomaterial, which are easy to combine with Epoxy in the way of physics or chemistry, strengthen the coalescent of nanoparticle, and the matrix next to the interface, the Epoxy can bear definite load, so it is possible to increase toughness and rigidity of Epoxy simultaneously.Improving of the adhesive capability starts from two aspects: one is to improve adhesion of the adhesive and adherend, the other by enhancing the adhesive layer intensity and weather resistance. The unusual specific property of nanoparticles shows good merits at the both, which makes it become the new material of modified adhesive performance.It has carried out something on the conventional factors that influence theadhesive capability, such as the selection and consumption of curing agent and dispersing agent, the surface treatment method etc. The main difficulty is how to make nanoparticles evenly scattered into Epoxy liquid. We selected KH550(dispersing agent) to activate nanoparticle and embellish the surface of nanoparticle with the high-speed adhesive mixer to stir and expedite their scattering. Observed through the atomic force microscope, Nanoparticles(SiO2) were distributed evenly in epoxy liquid, which is the purpose of experiments. The performance of modified Epoxy (E-51) takes much better effect than before, especially on resisting damp-hot aging and tensile strength.The results of experiments show that many capabilities are improved, the tensile strength enhanced 15.85 MPa, the increase of which reach 23.23%, the holding ratio of damp-hot aging is 77.19%. After damp-hot aging, the increased max ratio of tensile strength reached 20.90%, the impact and bending strength resistance increased 16.29%, the holding ratio of damp-hot aging for tensile strength increased by 14.54%.The holding ratio of resisting damp-hot aging for impact and bending strength increased by 0.56%.Whether before wet-hot aging or after, the tensile bending and compact strength are increased to the extent of 16% after the nanoparticles(SiO2) are mixed into epoxy ,which shows that nanoparticles(SiO2) can modify the capability of Epoxy(E-51).