Simulation And Experimental Study Of Aramid Staple Fiber/Rubber Blending Process Based On EDEM

Adding short fibers to rubber to make composite materials can improve the comprehensive properties of rubber and expand its scope of use.However,due to the characteristics of short fibers,uneven distribution and serious heat generation often occur during the mixing process,which restricts the application of short fiber/rubber composites.This paper takes the aramid staple fiber/rubber composite material as the starting point,and explores the mixing,heat generation and heat transfer mechanism of the staple fiber in rubber.Secondly,the aramid staple fiber/rubber mixing process is constructed with the help of EDEM.The model is used to study the variation law of the flow field and velocity field in the mixing process.At the same time,the effects of the addition fraction and length of aramid staple fiber particles and the rotor speed on the mixing degree of the particles were studied.Then,using tread rubber as the basic formula,through a large number of experiments,the effects of different additions,different lengths of aramid staple fibers and rotor speed on the aramid staple fiber/rubber composite were studied.Finally,in order to meet the needs of enhanced heat dissipation in the process of short fiber dispersion,the internal cooling channel of the meshed rotor is optimized,and its enhanced cooling performance is analyzed.The conclusions are as follows:1.It can be seen from the simulation results that with the increase of mixing time,the mixing degree of particles gradually improves,and it is close to the optimal mixing degree at the end of the mixing process.When the length of the aramid staple fiber is 3mm,the rotor speed at 90r/min,the mixing effect of particles is better.2.It can be seen from the experimental results that the tensile strength and wear resistance of the rubber compound are the best when the addition of aramid staple fiber is 2 phr.When the length of the aramid staple fiber is 3mm,the tensile strength and 300% tensile stress of the vulcanizate are larger,the tear strength is the best,and the comprehensive physical properties of the composite material are the best.When the rotor speed is 90r/min,the composite material has the best comprehensive physical properties.3.The double-spiral cooling water channel design of the meshing rotor is more conducive to heat dissipation,which is conducive to the uniform distribution of the temperature of the ridges,and reduces the maximum mixing temperature at the top of the ridges.In summary,through the simulation analysis and experimental study of the kneading process of aramid staple fiber/natural rubber,it is concluded that the composite material prepared by adding 2phr of 3mm aramid staple fiber to natural rubber has the best comprehensive performance.The performance of the composite material is the best when the rotation speed is 90r/min.The preparation formula and process of aramid staple fiber/rubber composites were optimized.The optimization of the rotor cooling water flow channel also provides a solution to the problems of excessively high temperature and excessively rapid temperature rise during the mixing process of high heat generation fillers.