Research On Nano-control Of Basalt Fiber Surface And Its Composite Material Mechanics And Friction And Wear Properties

Basalt fiber has the advantages of friction resistance,high temperature resistance,light weight and high strength,but the surface of basalt fiber is inert.There are several problems in the reinforced composites:the interfacial bonding force between the basalt fiber and the matrix is weak,the modification efficiency is low,and the modification method damages the strength of the fiber.In this paper,on the basis of previous research work,in order to meet the needs of different areas and different engineering:First,through the simple and efficient method of fiber surface sizing,silicon dioxide(SiO2),carbon nanotube(CNT)and grapheme(GR)coated to the surface of a micron scale of basalt fiber,the preparation of the multi-scale fiber reinforcement,the effects of the basalt fiber on the mechanical,thermodynamic and tribological properties of the composites after the surface modification of different nanomaterials were studied.Second,on the premise of not damage the basalt fiber,dopamine as a bridge,the nano silicon dioxide(SiO2),carbon nanotube(CNT)and graphene oxide(GO)grafted to the surface of basalt fiber,constructed the multi-scale fiber reinforced body,studied the different nano materials surface grafting modification of basalt fiber mechanical and friction properties of the composites.Modification method using surface sizing,polyurethane aqueous solution as sizing agent,in the basalt fiber(BF)surface deposition adhesion morphology of nano silicon dioxide,carbon nanotubes and graphene,by adjusting the nano SiO2,CNTs and GR in the sizing agent concentration,control of basalt fiber on the surface the content of nano-SiO2,CNTs and GR,particle size and surface roughness,prepared multi-scale morphology controllable reinforcement,excellent mechanical and tribological properties of composites.Compared with the unmodified BF/PA6 composites,the tensile strength of SiO2-BF/PA6,CNT-BF/PA6 and GR-BF/PA6 composites increased by 14.6%,17.5%and 18.2%,respectively,and the flexural strength increased by 18.1%,36%and 34.6%,respectively,and the wear rates were reduced by 34%,41%and 42%,respectively.The chemical grafting method,using dopamine self-polymerization of dopamine reaction polymerization,polydopamine adhesion on the surface of basalt fiber,with polydopamine as a bridge,through the surface of polydopamine high levels of reactive functional groups,the function of the nano silicon dioxide,carbon nanotubes and graphene oxide grafted to the surface of basalt fiber.By adjusting the content and reaction time of nano SiO2,CNTs and GO,a multi-scale reinforcement with controllable morphology was prepared,and the mechanical and tribological properties of the composites were improved.Compared with the unmodified BF/PA6 composites,the impact strength of SiO2-PDA-BF/PA6,CNT-PDA-BF/PA6 and GO-PDA-BF/PA6 composites increased by 23.4%,28%and 13.6%,respectively,and the flexural strength increased by 13.3%,23%and 12.7%,respectively,and the wear rates were reduced by 36%,36%and 51%,respectively.