硅烷偶联剂改性玄武岩纤维复合材料的制备与表征OA

Basalt fibers are a new type of mineral fibers.Due to their excellent mechanical and thermal properties,basalt fibers are widely used in the field of composite materials and can be used to manufacture industrial products with high chemical inertness and high temperature resistance.However,due to their low surface energy and high chemical inertness,basalt fibers show weak interfacial bonding ability when combined with most polymer resins.This characteristic makes the interface area prone to become a weak link in the material when subjected to external loads,leading to insufficient interaction between the fiber and the matrix,reduced stress transfer efficiency,and ultimately a decline in the overall mechanical properties of the composite material.To address this issue,surface modification of the fiber is required to enhance its interfacial bonding performance with the resin matrix,so as to meet the strict requirements for mechanical properties of composite materials in practical applications. To develop basalt fiber composite panels with high strength,high toughness,and excellent interfacial properties,this paper proposes a composite panel using basalt fiber as the reinforcement and BAC448 type epoxy resin as the matrix.The design aims to fully utilize the inherent high strength and modulus of basalt fibers,and achieve efficient synergy between fiber and matrix through optimized composite processes,thereby obtaining composite panels with superior comprehensive performance.Due to the rich hydroxyl groups on the surface of basalt fibers,different mass fractions of silane coupling agents KH570 and KH550 are used to perform gradient modification on two different types of basalt fibers.With the grafting of coupling agents on the fiber surface,the interfacial bonding force between fiber and matrix can be effectively improved.The modified BF is mixed with BAC448 type epoxy resin and hot-pressed using hot pressing molding technology to prepare basalt fiber-reinforced composite panels. Experimental results show that for coarse filament composite panels,when the mass fractions of KH570 and KH550 are both 12%,the interfacial performance reaches the best.At this time,the flexural strengths are increased to 323.98 MPa and 364.10 MPa,repspectively,which are significantly improved by 76.58%and 98.44%compared with the unmodified panels;the interlaminar shear strengths reach 45.51 MPa and 44.04 MPa,with corresponding increases of 5.24%and 1.85%.In fine filament composite panels,the optimal modification effect is achieved with KH570 and KH550 at a mass fraction of 10%.The flexural strengths are increased to 282.86 MPa and 275.08 MPa,with increases of 9.70%and 6.68%,respectively;the interlaminar shear strengths are increased to 40.05 MPa and 39.99 MPa,with increases of 6.63%and 6.47%,respectively.It is found that the increase in flexural strength of coarse filament composite panels is much higher than that of fine filament composite panels.This study provides experimental basis and theoretical support for optimizing the interfacial performance of basalt fiber composites.