Development And Properties Of High Performance Room Temperature Curing Epoxy Resin Adhesive For Large Rotating Generator

High-voltage motor anti-corona technology is an important aspect in the field of insulation,which is directly related to the safety,reliability and service life of the unit.High-voltage motor anti-corona technology is an important aspect in the field of insulation,which is directly related to the safety,reliability and service life of the unit.In order to improve this problem,it is particularly important to produce composite materials with good nonlinear electrical conductivity properties.In this thesis,the method and mechanism of adjusting the reaction process,improving the curing state and increasing the mechanical strength of the product by compounding the modified curing agent in the solvent-free and filler free room temperature curing epoxy system are studied.The internal factors affecting the properties such as application period,curing time,rigid strength and ductile strength of the product are analyzed and summarized,and the method of balancing the conflict relationship between properties is refined;A high performance room temperature curing epoxy adhesive was developed and compared with six similar adhesives used in the manufacture of large rotating motor,and the application performance was studied on the real machine of large hydrogenerator.In curing agent with modified method can achieve the reaction process,curing condition and product performance of controllable adjustment and performance improvement;Through the fast type of rigid selection of proper curing agent and slow type of toughness curing agent and the mixed use,can achieve synchronous balance of pot life,cure time,and the balance of the rigid strength,toughness,strength;And contrast test of similar materials show that to develop high performance at room temperature with the most appropriate reaction process of epoxy adhesives and the most excellent product performance,excellent curing ability on the basis of the applicable period,140 min 12.5 MPa under normal shear strength,bending strength112.7 MPa and 12.1 k J/m~2 of the impact strength,are seven kinds of materials,mechanical strength and the breakdown strength of mv/m,3.84 x 10~8 MΩ·m.volume resistivity and surface resistivity of 2.87 x 10~9 MΩ,and 0.0068 normal dielectric loss,and at a higher level of six kinds of active material performance is even a slight rise;In the comparative study on the real machine application,the application of the long period,excellent curing completely fit even more agree with the requirement of three kinds of process,curing condition more rapid degree can be machined,greatly shorten the waiting time between processes,finally passed the 43 k V machine including power frequency ac withstand voltage test and 70 k V ladder dc withstand voltage test,all the acceptance test,electric performance and mechanical strength effectively.