Study On Epoxy Acrylate Based UV-Curing 3D Printing Materials Reinforced&Modified By Nano-TiO₂&GO

Three-dimensional?3D?printing technology,as a combination of augmentation manufacturing and rapid prototyping technology,has become one of the focus of manufacturing industry research.But the development and application of the 3D printing technology are restricted by the low mechanical properties and high curing shrinkage of 3D printing materials.In order to improve the mechanical properties of 3D printing materials,the surface modification of nano-titanium dioxide?nano-TiO₂?and graphene oxide?GO?was carried out respectively.Because traditional nanoparticles has poor dispersion,compatibility and weak interface bonding with 3D printing materials,acryloyl chloride?AC?and KH570 were used to modify the surface of nanoparticles,respectively.The surface of nanoparticles was changed from hydrophilic to lipophilic,and AC and KH570 contained double bonds,so that nanoparticles participated in UV-curing reaction which enhanced the Interface bonds.The effects of different surface modification methods and different additions on the mechanical properties,curing properties and thermal stability of 3D printing materials were studied.In this paper,nano-TiO₂ was modified by acryloyl chloride?AC?and KH570,which was used to enhance properties of 3D printing materials.The results showed that nano-TiO₂ modified by AC and KH570 was coated by organic layer,which could alleviate nano-TiO₂ agglomeration in the 3D printing materials and evenly dispersed in the 3D printing materials.The addition of nano-TiO₂ could significantly improved the mechanical properties of 3D printing materials.The main reason why nano-TiO₂ could enhance the mechanical properties and fracture toughness of 3D printing materials was that the nano-TiO₂ had the bridge,deflections of cracks when subjected to external forces.Between the two modified ways,the effect of nano-TiO₂-AC on the mechanical properties of materials was more obvious.When the content of nano-TiO₂-AC was 3.0wt%,the three-dimensional printing material got the strongest tensile strength,impact strength and bending strength.which were increased by 36.4%,67.3%and 44.7%.Besides,the addition of modified nano-TiO₂ could reduce the volume shrinkage of 3D printing materials.In this paper,GO was modified by acryloyl chloride?AC?and KH570,which was used to enhance properties of 3D printing materials.The results showed GO modified by AC and KH570 was added to the 3D printing materials,the number of stacks between layers decreased,the tendency of agglomeration decreased,and GO could be dispersed in 3D printing materials.The single and complete two-dimensional structure of GO made GO as a reinforcing phase able to withstand large loads when the material was subjected to external stress.It showed great stiffness along the plane of carbon atoms when it was subjected to tensile stress.A small amount of addition could signifycantly improve the mechanical properties of the composite.GO treated by surface modification as a reinforcing phase could significantly improved the mechanical properties of 3D printing materials.When the content of GO-AC was 1.5wt%,the tensile strength,impact strength and bending strength of the three-dimensional printing materials reached the maximum,which were increased by 34.7%,53.8%and 35.9%.Besides,the addition of modified GO could reduce the volume shrinkage of 3D printing materials.The results showed that the enhancement effect of nano-TiO₂ on the thermal stability and mechanical properties of the materials was better than GO;the nano-TiO₂ modified by acryloyl chloride had the most obvious effect on the mechanical properties of the 3D printing materials.