Study On Modification Of Nylon 6/Basalt Fiber Composite

With the progress of our country's automobile lightweight technology and scientific development,more and more composite materials appear in the key parts of automobiles.Fiber composite material(FRTP)has the advantages of integrated molding,good physical and chemical properties,etc.,and is a pioneering potential material in our country's automobile manufacturing industry.Basalt fiber(BF),as a natural and environmentally friendly reinforcing material,is made by crushing a finely powdered basalt mixture at 1500-1700? and melting it to produce a glassy molten liquid,which is then homogenized and fiber extracted.It will not release any harmful chemical elements during the production process,has excellent mechanical and chemical properties,and a high recovery rate.When used as a reinforcing fiber,its surface is smooth and inert,and its adhesion to the matrix material is poor,which limits the development of basalt fiber composite materials.Silicon carbon black(Si CB)is a micron-sized black powder obtained by selective pyrolysis and directional crushing of rice husks.Grinding and coupling agent modification can effectively reduce the surface energy to avoid agglomeration between particles.The modified silicon carbon black(KSi CB)has strong adhesion to the resin matrix,which can improve the overall performance of the composite material.In this paper,nylon 6(PA6)was used as the matrix,BF and Si CB were used as reinforcing materials,and polyolefin elastomer grafted with maleic anhydride(POE-g-MAH)was used as toughening materials to prepare a multi-element composite material and study its comprehensive properties.1.Different content of basalt fiber was used as reinforcement to prepare binary composite PA6/BF.The surface modification of the fiber was carried out by calcination,acid-base activation,and coupling agent treatment methods to improve the interfacial bonding ability of basalt fiber and PA6.The BF and composite materials were characterized before and after use.BF had an obvious enhancement effect on PA6.Compared with pure PA6,the tensile strength,the bending strength,and impact strength of the PA6/BF-30%system were increased by53.69%,48.66%,and 174.23%,respectively.Among them,BF played a role in heterogeneous nucleation and improved the crystallinity of the material.At this time,the apparent shear viscosity and thermal stability of the material were greatly improved.Compared with the unmodified composite material with a BF mass fraction of 30%,the mechanical properties of the PA6/BF composite material treated with H₂SO₄ and the coupling agent(KH-550)were the best,and its tensile strength,flexural strength,and impact strength were increased by 24.36%,28.26%,and 37.41%respectively,at this time the apparent shear viscosity and heat distortion temperature of the material increased.2.The best BF modified binary composite PA6/BF was filled and modified,and the silicon carbon black particles and composite materials before and after the modification were characterized.When POE-g-MAH was added to the composite system,the overall mechanical properties of the material showed high toughness and low strength.At this time,the thermal stability and crystallinity of the system decreased,but the viscosity increased.When inorganic particles KSi CB were added to PA6/BF alone,the KSi CB/PA6/BF system exhibited high strength and low toughness mechanically.At the same time,the thermal stability,crystallinity and viscosity of the material were improved.However,when POE-g-MAH and KSi CB were added at the same time,KSi CB and POE-g-MAH had a better synergistic effect.When the content of KSi CB was 2.5 phr,the mechanical properties of the composite material were the best,and its tensile strength,tensile modulus,bending strength,and impact toughness increased by 4.46%,171.79%,15.14%,and 27.77%,respectively.