In order to improve the interfacial compatibility between tourmaline (TP) and polypropylene (PP) matrix, and to improve the mechanical properties of TP/PP composites, in this study, γ-aminopropyltriethoxysilane (KH550) was used as a modifier to modify the surface of TP and the modified TP/PP composite was prepared by melt blending and injection molding process. The mechanical property tests showed that the tensile and flexural properties of the composites were improved to a certain extent; the 1% concentration of KH550 modifier had the best modification effect. When the content of tourmaline was 10 wt%, the tensile strength of the composites was increased by 16.87% (compared with that of the pure PP, the tensile strength was increased by 31.23%). When the content of modified TP was 5 wt%, the flexural strength of the composites was increased by 9.42% (compared with that of the pure PP). 9.42% (15.2% increase over pure PP). Microstructural analysis (SEM) showed that the modification with 1 % concentration of KH550 could effectively inhibit the agglomeration of TP and improve its dispersion and bonding in PP matrix, thus exerting the reinforcing effect of inorganic filler reinforcement.
