Research On 3D-Printed Materials Of ABS Based On FDM

Fused deposition molding(FDM) is one of the most widely used 3D printing technology, The design of products and production cyclewas shorten and the cost of production was lower under the FDM which is a technology without the need for traditional mold manufacturing and machining.Thermoplastic plasticis can be used as raw material for general FDM molding equipment, so the material selection that can be applied to its process is relatively wide. While improving the performance of existing materials, research and development of new materials is a hot spot in the research of FDM in recent years.Since the composite properties of acrylonitrile butadiene styrene(ABS) material is excellent, its application in FDM process, especially in industrial design, has a very important application value. Due to the inadequate toughness, the poor flow, uneven shrinkage in the process of forming and the poor flexural properties of the material after cooling when general injection molding and extrusion grade ABS used in FDM easily lead to the problems of broken wires, warping, cracking. The printing effect of ABS material in FDM is difficult to meet the ideal application requirements. Therefore, modification of ABS by means of blending, copolymerization and compounding is necessary.In view of the above problems, Melt blending extrusion process is adopted in this paper. Modification of ABS 8391 resin, synthesized by continuous bulk polymerization, by melt blending with SAN grafted high glue powder, SAN resin, K Resin and different topologies SBS/SEBS/SIS thermoplastic plastic. Research and analysis of the change of the rheological properties and mechanical properties. The FDM process was applied to some of the above blend alloy, and the printing temperature range, molding parts and heating plate bonding force and printing warp degree are tested.SAN grafted high glue powder, SAN resin, K Resin were employed in Acrylonitrile Butadiene Styrene(ABS) by melt blending modification in this paper. Mechanical properties, processing flow and shear rheological properties is studied. The experimental results show that the high glue powder can improve the toughness and melt strength, ultra high molecular weight SAN can quickly enhance the melt strength of the blends. Low molecular weight SAN resin and K resin can improve the processing fluidity, and reduce the dependence of the shear viscosity on the shear rate of ABS.The effects of different molecular weight and topological structure of SBS/SEBS/SIS on the rheological and mechanical properties of ABS were studied.Different molecular weight of SBS, low molecular weight of SEBS and SIS can improve the processing flowability of ABS, especially the role of SIS. When the mass fraction of SIS was 5%, the MFR value of the three different structures of SIS/ABS alloy increased 50% compared with pure ABS, when the mass fraction of SIS reached 10%, its MFR value increased more than 100%.Dependence of shear viscosity and modulus on shear rateand the uneven shrinkage of the material in FDM moldingwere reduced after the addition of SBS with different molecular weight, low molecular weight SEBS and SIS. The addition of SBS/SEBS/SIS with different molecular weight and topological structure can improve the melt strength of ABS at low frequency, and improve the ability of resisting uneven shrinkage in the process of forming. Low molecular mass of SBS/SEBS/SIS were employed in ABScan reduce the dependence of modulus on temperature, the processing temperature range is relatively wide. The notch toughness and fracture toughness of ABS have been improved after blending with SBS, SEBS can improve the fracture toughness of ABS, and the mechanical properties of ABS can be greatly improved by the addition of SIS. When the amount of SIS addition was 5%, the tensile strength, elongation at break, bending strength, bending modulus and notched impact strength of ABS were retain 98%, 91%, 95%, 97% and 94%, respectively. Compared with linear SBS/SEBS, thestar SBS/SEBS has more excellent processing fluidity after blending with ABS, and a more stable two-phase structure is formed at low frequency.In this paper, The FDM printing temperature, the bonding force between the forming part and the heating plate, and the warping degree of the molded parts are tested by the selected ABS blends. The test results consistent with the theoretical analysis.ABS/ styrene blend alloy has a significantly lower processing temperature, a lower degree of warping, and a higher bond strength between the molded part and the heating plate. The SIS with methyl side chain is especially significant to the improvement of ABS warp.