Preparation and investigation properties of epoxy resin composites reinforced with non-metallic powder pyrolysis products from waste wind turbine blades
In response to the issue of large-scale disposal of waste wind turbine blades,the pyrolysis products of waste wind turbine blades(RWTBs)non-metallic powders(as P-RWTBs)were used as fillers,curing agent triethylenetetramine(TETA),matrix epoxy resin(EP),additive ceramic powder(CP)and KH-560 to prepare composite materials,which realized the recycling and reuse of waste wind turbine blades.Composite materials were prepared by pouring molding method.Effects of pyrolysis conditions on the weight loss rate of RWTBs during pyrolysis,as well as the effects of CP addition and KH-560 mass fraction on the mechanical properties,heat resistance,and corrosion resistance of the composite materials were investigated in this research.The results showed that when the heating rate was 10 ℃·min-1,the optimal pyrolysis condition was at 600 ℃ for 6 hours,at which point the thermosetting resin on the surface of RWTBs was completely pyrolyzed.When using TETA as the curing agent,20％CP as the additive,and P-RWTBs as the filler,the P-RWTBs 2％KH-560/20％CP/EP composite material prepared by 2％KH-560 treatment was with good mechanical properties.The tensile strength,bending strength,and impact strength reaches 55.59 MPa,86.43 MPa,and 23.99 kJ·m-2,respectively.Compared with TETA/EP,it had increased by 23.1％,77.1％,and 35.3％,respectively.When the temperature reached 360.7 ℃,the pyrolysis weight loss rate of P-RWTBs 2％KH-560/20％CP/EP composite material was 30％,which was 15.9 ℃ higher than TETA/EP.After 48 hours of acid immersion,the tensile strength,bending strength,and impact strength of P-RWTBs 2％KH-560/20％CP/EP composite material decreased by 10％,2.4％,and 5.4％,respectively.Compared with RWTBs 20％CP/EP,it had stronger corrosion resistance.The improvement in the performance of P-RWTBs 2％KH-560/20％CP/EP composite material was mainly due to the grafting of KH-560 onto the surface of P-RWTBs,which formed a layer of silane molecule covering layer.The hydrophilic group undergowent hydrogen bonding with the hydroxyl group in the EP matrix,enhancing the interaction force between the filler and the matrix,strengthening the interfacial bonding strength of the composite material.At the same time,it improved the hydrophilicity and lipophilicity of the composite material,making its surface more stable and smooth.It can effectively slow down the corrosion rate.This research can provide a new approach for the resource recovery and reuse of waste wind turbine blades.
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维普
