Study on Toughening Materials for Stereolithography
|School||Huazhong University of Science and Technology|
|Course||Materials Processing Engineering|
|Keywords||Rapid Prototyping UV-curable Free radicals - cationic hybrid polymerization system Toughening Modification Fill Material Epoxy acrylate|
Stereolithography light shines on the surface of the photosensitive resin curing layering forming technology. This paper studies the photosensitive resin material. Stereolithography technology, the direct impact of the photosensitive resin material light curing the dimensional accuracy of parts, mechanical and thermal performance, and its expensive price restrict light curing the promotion and application of rapid prototyping technology. Therefore, the development of high-performance, low-cost photosensitive resin material has a very important practical significance and application value. The paper first discusses the The stereolithography mechanism photosensitive resin curing depth and the amount of critical exposure measurement methods and characterization of photosensitive resin parts precision. Research radicals - cationic hybrid polymerization system composition and performance, the preparation of a practical application of the value of confounding UV curable photosensitive resin. In order to improve the toughness of the above-mentioned photosensitive resin, the authors synthesized by a solid filler and characterization by Fourier transform infrared spectroscopy, and the filler is a long chain of a bisphenol A type epoxy resin synthesized from a bisphenol A type epoxy acrylate solid . By studying the synthesis process, a polymerization agent, a catalyst, the reaction temperature and the feeding of raw materials than the influence on the reaction, to find an optimum synthesis conditions. The synthesized product was milled after adding the hybrid-type photosensitive resin, can improve the toughness of the hybrid-type photosensitive resin, the experiment proved can also be effective to reduce the curing shrinkage. In order to optimize the formulations of the photosensitive resin, the authors synthesized a photosensitive resin composition in the main body of the resin (prepolymer) and characterization by Fourier transform infrared spectroscopy, and the resin is an alicyclic epoxy resin as a raw material synthesis alicyclic ring oxygen acrylate. By studying the synthesis process, a polymerization agent, a catalyst, the reaction temperature and the feeding of raw materials than the influence on the reaction, to find an optimum synthesis conditions. Different initiator is added to this resin composition different systems, through the study of the curing rate of these different systems, curing shrinkage rate, and the its cured film heat - force analysis, show that adding radical photoinitiator system - cation mixed can satisfy the laser stereolithography process requirements, and having a higher glass transition temperature. Fourier transform infrared spectra of a the same time, the synthetic resin and the different systems of the cured film radicals - cation mixed photoinitiator system can be a hybrid polymerization.