Digital Light Processing(DLP)printing technology has obvious advantages in various 3D printing technologies,and there is a huge market demand for high-performance and high toughness photosensitive resins for DLP printing.This study designed a testing method for the horizontal dimension stability of photosensitive resin during the curing process and the effects of factors such as monomer,prepolymer type,initiator content,and curing time on the horizontal dimension stability of the resin were investigated.The flexible and rigid photosensitive resins suitable for DLP printing technology were prepared using this testing method.The two resins were mixed in a certain proportion,and the mechanical properties such as the tensile strength of the printed sample were tested.The tensile fracture surfaces of the samples were analyzed by scanning electron microscopy,and the effect of resin components on material toughness was studied.The results showed that using rigid photosensitive resin as a continuous phase,provides elastic modulus,and using flexible photosensitive resin as a dispersed phase,provides stress concentration.The two resins are mixed in a ratio of 3∶1 and 1∶1,which can significantly improve the toughness and elongation at break of printing materials.
3D printingPhotosensitive resinHigh toughnessDimension stability
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