Effect of thermosetting resins on properties of paper-based friction materials
The paper-based friction materials with five different thermosetting resins of cashew nut shell liquid modified phenolic resin(PF),bismaleimide resin(BMI),polyimide resin(PI),bisphenol A epoxy resin(EP)and benzoxazine resin(BOZ)as the binder were prepared by utilizing wet-forming technology.The effects of temperature and time on the solidification of resins in paper-based friction materials were analyzed.Meanwhile,the influences of different resins on the shear strength,compression rebound performance,dynamic thermomechanical properties,and frictional wear properties of paper-based friction materials were investigated.The results demonstrated that the solidification of the five resins became larger with the increase of temperature and time.The mechanical properties of the paper-based friction materials with diverse resins as the binder were obviously different.Among them,the paper-based friction material(BMI-F)with BMI as the binder had a denser structure with the best mechanical properties:the sample shear strength 2.28 MPa,compression re-silience and thermomechanical properties remained stable.At the same time,the average dynamic friction coefficient of BMI-F at 2.96,4.50,and 5.60 MPa was 0.133,0.127,and 0.121,respectively,while the static friction factors was 0.161,0.157,and 0.154,respec-tively.The wear rate was 0.89×10-8 m3/(N·m),presenting the best friction and wear performance.
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