Polycarbonate Materials For FDM Research

With the development of manufacturing industry worldwide,the traditional manufacturing industry has been unable to meet the demands of modern manufacturing industry in terms of intelligence,celerity and high accuracy.In this context,additive manufacturing technology as a leading advanced manufacturing technology has achieved rapid development.Developing Material is the basis and key to 3D printing,researching and developing new materials applicable to 3D printing technology and improving the performance of the existing materials continuously,we can only expand the application field of 3D printing,and meet higher the application requirements.FDM technology is the most widely used technology in 3D printing,which is used in both home and office environments handily.However,the FDM mainly use thermoplastic plastics,such as polylactic acid and ABS,which are low in melting point,and can’t be applied in the engineering field in large quantities.Engineering plastics,such as polycarbonate,nylon,polyether ether ketone,etc.can’t still be used in most of FDM type 3D printers,only a small amount can be used in special high temperature the printer.Therefore,it will effectively promote the further development of FDM technology,how to modify engineering plastics such as the polycarbonate to make it applicable in common FDM type 3D printers.Through melt flow modification and toughening modification of the polycarbonate and polycarbonate/ABS and polycarbonate/polystyrene alloy by using twin screw extruder,polycarbonate material generalized to FDM was prepared in this paper,the tensile strength of the printed products is about 50 MPa,notched impact strength is about 20 kJ/m2,thermal deformation temperature was 76 ℃.Through melt index test,DSC and mechanical properties test and analysis,the effect of melt flow modification and the influence of 3D printing process of the polycarbonate and its alloy was studied.By testing mechanics performance,thermal deformation temperature,linear expansion coefficient and using SEM analyze impact cross section,analyzed distribution of different the toughening agent in the matrix and toughening effect,the possible toughening mechanism was put forward.In the end,the formula of polycarbonate and its alloy materials applied to FDM technology was ascertained,and the preparation process and using parameters were also obtained.The research shows that polycarbonate added polycaprolactone had good liquidity improvement.Adding 20 polycaprolactone to 100 polycarbonate,liquidity increased more than 3 times.it promoted the cohesive force between silk and silk,layer and layer resulted from 3D printing,the tensile strength produced a small decline,problems that polycarbonate became buckling deformation was also able to be improved when it applied to 3D printing,the notched impact strength of polycarbonate modified flowability decreased seriously.The linear SBS had a low compatibility with the polycarbonate,the effect of toughening was not outstanding.Core-shell type MBS was added to polycarbonate,while toughness had a significant increase,tensile strength didn’t reduce too much.When preparing polycarbonate alloy materials,choose the appropriate compatibilizer first.Among three kinds of compatibilizers,LOTADER?AX8900(ethylene-methyl acrylate-glycidyl methacrylate terpolymer),maleic anhydride grafted ABS and styrene-maleic anhydride copolymer,adding 10 compatilizer LOTADER? AX8900 to 100 alloy could make this alloy have good compatibility,stable extrusion forming.Continuing to modify liquidity and toughening of polycarbonate alloy,polycarbonate/ABS alloy added 15 and above polycaprolactone could also be used in FDM 3D printer,but performance improvement was not obvious after it was toughened,3~6 MBS was added to polycarbonate/ABS to make it suitable for FDM technology.Liquidity of polycarbonate/polystyrene alloy was remarkable,after flow modification;mechanical property could improve to a certain extent after it was toughened,but not significantly,Its performance and effect of 3D printing were less than modified polycarbonate and polycarbonate/ABS alloy.