Study On The Properties Of UV-Curing Rapid Prototyping Resin Modified By Nano-materials

Stereolithography technology is the forming progress of three-dimensional object by layer-by-layer curing and superposition when UV curing resins exposure to UV-light. In this paper, we mainly investigated the nano modification of UV curing resins.UV curing resins have a direct impact on the dimensional precision and mechanical properties of products. At present, UV curing resins have some disadvantages, such as shrinkage, low strength and poor mechanical properties. These disadvantages hinder the further development of the stereolithography technology. Therefore, the developing of the superior materials for stereolithography technology is meaningful and valuable.In this paper, matrix UV curing resins were prepared by bisphenol A epoxy acrylate and modified by nanoparticles.?1? Graphene and carbon black modified matrix resinWe studied the effect of graphene and carbon black on the properties of UV curing resin. The properties of the graphene modified resin were investigated compare with that of carbon black modified resin. The test results show that the viscosity of the resin containing 0.25wt‰ graphene and carbon black is decreased. It can be seen in TEM that carbon black formed agglomerate structure and graphene was well dispersed in the liquid UV curing resin. TGA showed that the fastest decomposition temperature of modified resin was increased and the fastest decomposition rate of the modified resin was decreased. This means that graphene and carbon black can improve the thermal stability of the matrix resin. After modified by carbon black, the tensile strength of UV curing resin was diminished by 32.8%, and the flexural modulus was decreased by 46.88%; after modified by graphene, the tensile strength of UV curing resin increased by8.39%, and the flexural modulus decreased by 46.79%.?2?Nano SiO₂ modified matrix resinFirst,nano SiO₂ was modified by modifier KH570 and then compounding with matrix resin by mechanical blending process. We studied the effect of modified nano SiO₂ on the properties of UV curing resin. Viscosity tests show that the viscosity of the resin increases with the increase of the mass fraction of the modified nano SiO₂ in the range of 1⁵wt%, but it still has good fluidity, which is consistent with the requirement of the DLP forming machine for the viscosity of the resin. The volume shrinkage rate of the resin decreased with the increase of the content of the modified nano SiO₂ and the volume shrinkage rate was 6.49% when the connection of modified nano SiO₂ was 5wt%. We studied the effect of modified nano SiO₂ on the curing rate of UV curing resin by testing gelling percent. The gelling percent of the resin decreased with the increase of the mass fraction of the nano SiO₂ and the gelling percent was the highest when the mass fraction of modified nano SiO₂ was 1%? the gelling percent was 88.19%?. We studied the effect of modified nano SiO₂ on the thermal stability of UV curing resin by TGA. It showed that the fastest decomposition temperature of modified resin was increased and the thermal stability of the matrix resin improved. Tensile results showed that with the increase of the mass fraction of the modified nano SiO₂ the tensile strength of the composite first increased and then decreased and the tensile strength was the highest when the mass fraction of modified nano SiO₂ was 2%? the tensile strength was 23.19 MPa and increased by 69.83%?.?3?Nano Al₂O3 modified matrix resinFirst,nano Al₂O3 was modified by modifier KH570 and then compounding with matrix resin by mechanical blending process. We studied the effect of modified nano Al₂O3 on the properties of UV curing resin. Viscosity tests show that the viscosity of the resin increases with the increase of the mass fraction of the modified nano Al₂O3 in the range of 1⁵wt%, but it still has good fluidity, which is consistent with the requirement of the DLP forming machine for the viscosity of the resin. The volume shrinkage rate of the resin decreased with the increase of the content of the modified nano Al₂O3 and the volume shrinkage rate was 6.84% when the connection of modified nano Al₂O3 was 5wt%. We studied the effect of modified nano Al₂O3 on the curing rate of UV curing resin by testing gelling percent. The gelling percent of the resin decreased with the increase of the mass fraction of the nano Al₂O3 and the gelling percent was the highest when the mass fraction of modified nano Al₂O3 was 2%? the gelling percent was 88.3%?. We studied the effect of modified nano Al₂O3 on the thermal stability of UV curing resin by TGA. It showed that the fastest decomposition temperature of modified resin was increased and the thermal stability of the matrix resin improved. Tensile results showed that with the increase of the mass fraction of the modified nano Al₂O3 the tensile strength of the composite first increased and then decreased and the tensile strength was the highest when the mass fraction of modified nano Al₂O3 was 3%? the tensile strength was 34.74 MPa and increased by 108.27%?.