Study On The Modification Of Basalt Fiber Composites Used For Wind Turbine Blades

Basalt fiber has high strength, high modulus, high resistance and good low temperature performance, so it becomes a new direction of wind turbine blades reinforcement. However, it has poor toughness. In this paper, basalt fiber composites are prepared by hand lay-up process and the composites are modified by rubber and inorganic particles.The results shows that for the unmodified basalt fiber composites, tensile strength and tensile modulus are 503.13 MPa and 15.6 GPa, respectively; bending strength and modulus are 400.25 MPa and 20.6 GPa, respectively; impact strength is 255.4 kJ/m~2; wear volume is 969.81 g/m~2.With nitrile rubber (NBR) to modify the composites, mechanical properties and abrasion resistance significantly improve. Modification effect of liquid NBR is better than solid NBR, the liquid NBR-40 is better than the NBR-26. With the content of NBR-40 increasing, the mechanical properties of composites increase and then decrease. When the content is 5%, the mechanical properties of composites are maximum. The tensile strength and tensile modulus increase by 24.43% and 18.46%, respectively; bending strength and modulus increase by 17.62% and 15.10%, respectively; impact strength increases by 17.52%. At this point, wear resistance also increases by 45.24%.With Nano TiO2, montmorillonite, wollastonite, and calcium carbonate particles to modify the composites, the mechanical properties and abrasion resistance are improve in varying degrees. Among them, the montmorillonite has the best modification effect. When the content is 3%, composites have the optimal performances, the tensile strength and tensile modulus increase by 11.35% and 12.31%, respectively; bending strength and bending modulus increase by 17.92 % and 20.39%, respectively; the impact strength increases by 11%, the wear volume decreases by 15.37%.