Study On The Tribological Properties Of Graphene-modified Basalt Fiber Fabric Reinforced Thermoplastic Composites

Basalt fiber fabric（BF）reinforced thermoplastic composites have the advantages of outstanding mechanical properties,no environmental pollution,strong wear resistance,high temperature resistance and easy processing,etc.,which are widely used in military industry,aerospace,chemical industry,automotive electronics and other high-tech fields.However,the surface of basalt fiber is smooth,without active groups,and the surface energy is low,which leads to the poor interface bonding performance between basalt fiber and thermoplastic resin,and further affects the mechanical and frictional properties of basalt fiber fabric reinforced thermoplastic composites.In this paper,in order to improve the basalt fiber fabric reinforced thermoplastic composite interface bonding properties,one is to attach graphene oxide（GO）to the surface of BF by electrostatic self-assembly method,and the other is to use PDA/PEI co-deposition method deposits GO on the BF surface.The third method is to apply polyethylene glycol（PEG）hydrothermally modified GO（PEG-GO）to the surface of BF,and study the corresponding basalt fiber fabric reinforced nylon 6（BF/PA6）modification of mechanical and friction properties of composite materials.The following is the specific research content and conclusion:（1）GO-BF was prepared with positively charged BF-NH₂ and negatively charged GO aqueous solutions at different concentrations after BF was treated withγ-aminopropyl triethoxy silane（KH550）by simple green electrostatic self-assembly method.FTIR,Raman,XPS and SEM confirmed that when GO concentration was 0.8g/L,GO was evenly distributed on the surface of BF.GO-BF and PA6 resin were prepared into BF/PA6 composite materials by laminating method.By studying the influence of GO concentration on the mechanical and frictional properties of BF/PA6 composites,it was found that 0.8g/L GO solution could improve the flexural strength,flexural modulus and impact strength of BF/PA6 composites by53.2%,63.44%and 43.2%respectively.GO also effectively improved the friction performance of BF/PA6 composites,and the average friction coefficient and wear rate of0.8g/L GO-BF/PA6 composites were reduced by 15.2%and 41.4%,respectively.When the GO concentration was 0.8g/L,the initial decomposition temperature and residual content of BF/PA6 composites at 800℃increased by 1.6%and 16.4%,respectively,compared with that of unmodified BF/PA6 composites.（2）GO-PDA/PEI-BF was prepared by deposition of GO on the BF surface by PDA/PEI co-deposition method.The structure and morphology characterization results showed that GO-PDA/PEI-BF was prepared gently and efficiently.The GO-PDA/PEI-BF/PA6 composites were prepared by laminar molding,the flexural strength and flexural modulus of GO-PDA/PEI-BF/PA6 composites were increased by 56.1%and 25.9%respectively,and the impact strength was increased by 23.8%.The results show that the average friction coefficient and wear rate of GO-PDA/PEI-BF/PA6 composites are reduced by 21.2%and 55.8%respectively.In addition,with the addition of GO-PDA/PEI,the initial decomposition temperature and residual content of BF/PA6 composites at 800℃increased by 2.6%and15.6%,respectively.（3）In order to modify BF fabric quickly and non-destructively,PEG-GO non-destructively prepared by hydrothermal method was applied to BF surface to prepare PEG-GO-BF.The BF surface morphology was uniform and stable when the PEG-GO mass fraction was 0.3wt%.The study of the properties of PEG-GO-BF/PA6 composites laminated by PEG-GO modified BF and PA6 with different mass fractions showed that the flexural strength,flexural modulus and impact strength of 0.3wt%PEG-GO-BF/PA6 composites increased by 61.3%,93.5%and 20.3%,the average friction coefficient and wear rate decreased by 19.1%and 58.5%,respectively,while the initial decomposition temperature and the residual content at 800℃increased by 1.8%and 23.3%,respectively.Overall,the GO-modified BF fabric prepared by the electrostatic self-assembly method,PDA/PEI co-deposition method and PEG coating method used in this paper has effectively improved the mechanical and friction properties of the BF/PA6 composite material.The relevant research is for the interface modification and performance improvement of fiber fabric reinforced thermoplastic composite materials provide new ideas and are expected to provide a reference for the development of high performance fiber reinforced thermoplastic composite materials.