Ni Rongping, Qian Bin, Liu Chang, Liu Xiaofeng, Qiu Jianrong
State Key Laboratory of Modern Optical Instrumentation, School of Optical Science and Engineering, Zhejiang University Hangzhou Zhejiang China
School of Materials Science and Engineering, Zhejiang University Hangzhou Zhejiang China.
RSC Adv. 2018 Aug 21;8(52):29583-29588. doi: 10.1039/c8ra05432k. eCollection 2018 Aug 20.
Compared with parts fabricated traditional methods, such as injection or compression molding, polymeric parts produced by 3D stereolithography (SLA) have poorer mechanical properties. Here, we demonstrate a cross-linking strategy used in the coating field to attain long chains for resin pre-polymerization to obtain final resin parts which can expand the application of SLA. Isophorone diisocyanate (IPDI), 2-hydroxyethyl methacrylate (HEMA) and polyethylene glycol (PEG)-based prepolymer have long chains, making it easier for them to form dense structures. However, the prepolymer has high viscosity and can solidify in the absence of a laser. Thus, three kinds of adjuvants were added to dilute the prepolymer to make the slurry suitable for 3D-printing. Slurries were cured with different laser powers and scanning speeds. Diluents are found to affect the curing properties differently. With the diluent 2-hydroxyethyl acrylate added into the prepolymer, shrinkage of printed parts is lower than 1.3%. With the diluent ethylene glycol monophenyl ether, the density range of printed parts is between 1.187 g cm and 1.195 g cm, which is higher than that of commercial PVC and PET. The three resins vary in density and hardness within a small range when the scanning speeds change. A relatively flat surface, high density and hardness can be obtained when the laser power is at 195.5-350 mW. Resin with this cross-linking strategy can expand the underutilized stereolithography's application from prototyping to actual parts by producing more functional components with excellent performance.
与通过注射或压缩成型等传统方法制造的部件相比，采用3D立体光刻（SLA）技术生产的聚合物部件机械性能较差。在此，我们展示了一种在涂层领域使用的交联策略，用于实现树脂预聚合的长链，以获得最终的树脂部件，从而扩大SLA的应用范围。异佛尔酮二异氰酸酯（IPDI）、甲基丙烯酸2-羟乙酯（HEMA）和聚乙二醇（PEG）基预聚物具有长链，使其更容易形成致密结构。然而，该预聚物粘度高，在无激光的情况下会固化。因此，添加了三种助剂来稀释预聚物，使浆料适合3D打印。浆料用不同的激光功率和扫描速度进行固化。发现稀释剂对固化性能的影响各不相同。在预聚物中添加稀释剂丙烯酸2-羟乙酯后，打印部件的收缩率低于1.3%。使用稀释剂乙二醇单苯醚时，打印部件的密度范围在1.187 g/cm至1.195 g/cm之间，高于商用PVC和PET。当扫描速度变化时，三种树脂的密度和硬度在小范围内变化。当激光功率为195.5 - 350 mW时，可以获得相对平整的表面、高密度和硬度。采用这种交联策略的树脂可以通过生产更多具有优异性能的功能部件，将未充分利用的立体光刻技术的应用从原型制作扩展到实际部件。
