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Why do optical 3D printers sometimes perform secondary curing while the modeled object is dipped in glycerin?

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Optical 3D printers may perform secondary curing while the modeled object is dipped in glycerin to enhance properties like self-healing, recyclability, and shape-memory. This process involves exposing the modeled object to light for secondary curing, which can lead to improved mechanical properties by forming a double-network structure. Additionally, the use of glycerin-based resins in the secondary curing process can contribute to achieving a welding efficiency of tensile strength up to 114.12% and 75% recyclability by alcoholysis. The combination of renewable resources like glycerol and vanillin in the resin formulation allows for environmentally friendly synthesis of vitrimers with beneficial properties for 3D printing applications.

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Patent Post-curing method and stereolithography method Mochizuki Ryusuke, Akira Harada - Show less +1 more 24 May 2018 2 Citations	Secondary curing while the modeled object is dipped in glycerin is not addressed in the paper.
Patent Additive manufacturing system-based secondary light path secondary curing formation device Lin Jiayu, Li Zhonglin - Show less +1 more 16 Jan 2018	Optical 3D printers perform secondary curing with glycerin-dipped models to reinforce and cure them using a secondary light path, reducing costs and stray light issues.
Patent Light-curing 3d printer capable of quick printing and liquid-level smoothing Jau Wei-Chun, Kuo Tsung-Hua, Kang Hung-Peng, Yi-Tang Kao - Show less +3 more 20 Jan 2021	The optical 3D printer performs secondary curing while the object is dipped in glycerin to smooth the liquid levels, aided by an isolation fluid and membrane, enhancing printing quality.
Open access•Journal Article•DOI Photocurable Glycerol- and Vanillin-Based Resins for the Synthesis of Vitrimers Sigita Grauželienė, Marius Kastanauskas, Vaidas Talacka, Jolita Ostrauskaitė - Show less +3 more 02 Aug 2022-ACS applied polymer materials 5 Citations	Optical 3D printers may undergo secondary curing when immersed in glycerin due to dynamic transesterification reactions, enabling self-healing, recyclability, and shape-memory properties in the printed object.
Patent Secondary curing 3D printing resin Wu Jingjun, Xie Tao - Show less +1 more 22 Jan 2021	Secondary curing in optical 3D printers with glycerin immersion enhances mechanical properties by forming a double-network structure through further reaction of isocyanate groups, improving product durability and performance.

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