Development and performance study of new bulletproof epoxy adhesive
A series of solvent-free epoxy adhesive systems were developed by using two kinds of epoxy resin,bismaleimide,epoxy chain extender,curing agent,accelerator,and two kinds of toughening agent,and their properties were comprehensively studied.The research results showed that,(1)Among the four different formulations of bulletproof epoxy adhesive,JC-4 had a moderate viscosity and a uniform overall downward trend with increasing temperature.When the temperature reached 60℃ or above,the viscosity was within 400 mPa·s,which facilitated fiber coating.The four formulations of epoxy adhesive had high reactivity,and could be cured at room temperature without damaging the performance of UHMWPE fiber.(2)The four formulations of bulletproof epoxy adhesive showed excellent shear strength in the medium and low temperature range,among which the adhesive of JC-3 and JC-4 formulations exhibited superior shear strength of over 11 MPa at 120℃,demonstrating good high-temperature stability and meeting the basic requirements of resin based strength and heat resistance for bulletproof composite materials.(3)The relative dielectric constants of the four formulations were between 3.9 and 4.5,all of which had good dielectric properties.Among them,the epoxy adhesive prepared by JC-4 formulation had the lowest dielectric constant and good electrical insulation properties.The dielectric loss of JC-2,JC-3,and JC-4 was within 1.8％,demonstrating excellent stability in dielectric loss.The water absorption rate of the four formulations of epoxy adhesive ranged from 0.36％to 0.65％,all of which had excellent hydrophobic properties.Among them,the JC-4 formulation adhesive had the lowest water absorption rate of only 0.362％.(4)The JC-4 formulation was used as the adhesive for bulletproof composite materials.The bulletproof composite materials were not penetrated during the shooting test,and the back surface was raised by the impact of the bullet,with a height of 23 mm,which could meet the performance requirements of the adhesive for bulletproof composite materials.
万方数据
维普
