Study On Nylon And Its Composite Filament For 3D Printing

In the field of 3D printing technology,Fused Deposition Modeling(FDM)has gradually become the largest technology in the market.In order to meet the domestic demand for high-performance FDM materials,it is urgent to develop FDM filament capable of producing high-strength plastic functional parts,and reduce material costs as much as possible.Nylon excellent mechanical properties,good stability,affordable,widely used in medical and automotive industries,so the development of FDM nylon material has broad application prospects and market value.For the development of new FDM nylon filament,six kinds of nylon materials were selected for the extrusion drawing and printing test.From the three aspects of material flowability,the extrusion drawing and printing,we can see whether the material can be used as FDM filament.Finally,copolyamide6/66 was used as the base material for this experiment.In order to make the nylon filament material more versatile and more functional,glass beads,montmorillonite,carbon fiber,aluminum powder and copolyamide6/66 were separately prepared into composite filament.The test results show that when the glass beads are treated with silane coupling agent and the content is 15wt%,the composite material has the best thermodynamic performance,and the tensile strength is increased by 17% and the flexural modulus is increased by 5% compared to the nylon substrate.Impact strength increased by 7%,Vicat softening point increased by 4°C,and melt volume flow rate(MVF)decreased by 21%.When the printing speed is 30mm/s,the mechanical properties of the composite filament printed sample are the best,compared with the pure nylon filament,the tensile strength of the printed product increases by 10.3%,the flexural modulus decreases by 8.1%,and the impact strength increases by 20.6%.Cationic montmorillonite modified by octadecyltrimethylammonium bromide(OTAB)was used to modify the sodium montmorillonite.When the reaction temperature was 80?,the montmorillonite layer reached the maximum of 2.14 nm,increasing 71.2%.When the content of montmorillonite is 2wt%,the composites have the best thermodynamic properties,the tensile strength increased by 4% and the flexural modulus increased by 9.7%,impact strength increased by 43%,Vicat softening point increased by 5?,MVF increased by 8% compared with the copolyamide substrate.When the printing speed was 70mm/s,the composite filament printing sample had the highest impact strength,which was 88.9% higher than that of the pure nylon filament.The carbon fiber is subjected to concentrated nitric acid treatment and hot air treatment,and the carbon fiber and the copolyamide are prepared into a composite filament.The composites have the best thermodynamic properties when the carbon fibers were treated with acid and the content is 10wt%.The tensile strength increased by 23.8%,the flexural modulus increased by 51.5%,the impact strength increased by 9%,the Vicat softening point increased by 16.7?,and the MVF reduced by 8% compared to the copolyamide substrate.When the printing speed was 50mm/s,compared with the pure nylon filament,the tensile strength of the composite filament printed sample increases by 17.8%,the flexural modulus decreased by 6.8%,the impact strength increased by 66.3%,and the comprehensive mechanical performance was greatly improved.The aluminum powder is surface-treated with a silane coupling agent and a titanate coupling agent,and the aluminum powder and the copolymide are prepared into a composite filament,and the aluminum powder is filled to make the composite material conductive.When aluminum powder is treated with silane coupling agent and the content is 10wt%,the composite material has the best thermomechanical properties,the tensile strength increased by 19%,the flexural modulus increased by 10% and the impact strength reduced by 15%,Vicat softening point increased by 7?,MVF increased by 54% compared with the copolymide substrate.When the printing speed was 30 mm/s,the composite filament printed sample had the maximum tensile strength,which was 12.8% higher than that of the pure nylon filament.