乙酰化木粉/聚烯烃木塑FDM线材的制备及性能研究

wood plastic composites(WPC) filament for fused deposition molding(FDM) was prepared by ball milling and screw extruding a mixture of polypropylene(PP), linear low density polyethylene(LLDPE) matrix, acetylated wood flour (AWF), talcum powder, nano SiO2, and other additives. The influences of the matrix ratio and the wood powder ratio on the properties of materials were investigated. Thermal stability,fluidity, and mechanical properties were characterized by using simultaneous thermogravimetric-differential thermal analysis system, Vicat softening Point tester, melt flow rate meter, and universal mechanical testing machine. The testing results show that the optimum m(PP)/m(LLDPE) ratio is 35:65. With the increase of the weight percentage of AWF in the WPC, the tensile strength, flexural strength, flexural modulus of the WPC firstly increase and then decrease. The material prepared with 30wt% of AWF has the highest tensile strength (24.5 MPa), bending strength (23.3 MPa), and elastic modulus (1023.3 MPa). The addition of wood powder raised the heat deformation temperature of the WPC. When the material contains 20wt%~30wt% of AWF, the WPC has relatively higher deformation temperature. The prepared WPC filaments were tested on a 3D printer. The results indicate that the thermal stability, mechanical properties, and fluidity of the material meet the requirement of 3D printing.