Study On Toughening Materials For Stereolithography

Stereolithography(SL) is the forming progress of the superposition when the photosensitive resins curing if exposured to the light . The UV-curing resin was the main subject inveatigated in this paper.In SL, the photosensitive resins have direct effect on the dimensional accuracy, mechanical properties and thermal properties of the fabricated parts. But the high price of the existing export materials restrict the application and popularization of SL, Therefore, the developing of the cheaper and superior materials for SL is meaningful and valuable.The curing mechanism of liquid photosensitive resins under UV laser, the measurement of penetration depth, the critical exposure and the accuracy of fabricated parts were discussed.The compositions and properties of hybrid polymerization system were studied, a photosensitive resin was prepared, which was applied in SL successfully.To increase the toughness of the hybrid photosensitive resin mentioned above, a kind of filler was synthesized and token by FT-IR. The filler was a bisphenol A epoxy acrylate, which was synthesized from bisphenol A epoxy resin. During the Synthesis, the impact of polymerization inhibitor, catalyst, reaction temperature and the ratio of input material were studied, and the best synthesis condition was found. The solid powder after grinded was added to the hybrid resin, the toughness of the new resin was increased, at the same time, the shrinkage was decrease.To optimize the compounding of the photo-sensitive resin, a novel prepolymer was synthesized and token by FT-IR. The prepolymer was an alicyclic epoxy acrylate, which was synthesized from the alicyclic epoxy resin. During the Synthesis, the impact of polymerization inhibitor, catalyst, reaction temperature and the ratio of input material were studied, and the best condition of synthesis was found. The different initiator systems were added to the novel prepolymer, the curing speed, curing shrinkage and DSC of the different systems were studied, and these results proved that the system added free-radical-cationic initiators satisfied the requirement of SL, and the system had a quite high glass transition temperature. At the same time, the FT-IR spectrograms of different cured film and the novel prepolymer showed that the hybrid polymerization took place in the system added free-radical-cationic initiators.