以2.7官能度大豆油多元醇(SBOP)与甲基丙烯酸乙酯二异氰酸酯(MOI)为原料,成功制备了2.7官能度可自由基光固化的大豆油基光敏树脂SBO-2.7A。将SBO-2.7A作为基体树脂,通过添加一定比例活性稀释剂丙烯酸羟乙酯(HEA),制备出了3D打印大豆油基光敏树脂。通过原位溶胶-凝胶法,将不同正硅酸乙酯(TEOS)添加量的大豆油基打印树脂配方进行3D打印成型,优选出最佳的酸性蒸汽后处理条件后,最终制备出具有机械性能提高的打印大豆油基材料。通过红外光谱仪、电子显微镜、哈克旋转流变仪、拉伸试验机等对3D打印树脂的黏度、光固化行为及其对3D打印样品的热力学性能、机械性能等的影响进行分析,结果表明,原位溶胶-凝胶法生成纳米SiO₂使得3D打印制品拉伸性能、储能模量均得到提高,其中拉伸强度由起始的9.96 MPa增加到了14.14 MPa,提高了42%;储能模量由293 MPa提高至567 MPa,提高了93.5%。

SBO-2.7A, a 2.7-functional free radical light-curing soybean oil-based photosensitive resin,is successfully prepared from 2.7-functional soybean oil polyol (SBOP) and ethyl methacrylate diisocyanate (MOI).As a matrix resin,SBO-2.7A is then mixed with a certain proportion of HEA reactive diluent to prepare soybean oil-based photosensitive resin for 3D printing purpose.Soybean oil-based printing resin formulations with varying TEOS dosages are 3D printed and molded through in situ sol-gel method.After selecting the optimal acidic steam post-treatment conditions,the soybean oil-based materials with improved mechanical properties are printed.The viscosity and light-curing behavior of the resin,as well as the thermomechanical and mechanical properties of the printed samples are analyzed through FT-IR,SEM,Hacker rotational rheometer,and tensile testing.Results indicate that the in situ sol-gel method leads to the generation of nano-SiO₂,which improves the tensile properties and energy storage modulus of the 3D printed products.The tensile strength increases by 42%,from 9.96 MPa to 14.14 MPa.Similarly,the energy storage modulus increases by 93.5%,from 293 MPa to 567 MPa.

曹力铸(1999-),男,硕士生,研究方向为植物油基、生物基树脂,347216530@qq.com;刘晓暄(1957-),男,博士,教授,研究方向为光固化、3D打印,通讯联系人,p-xxliu@gdut.edu.cn;崔艳艳(1980-),女,博士,副教授,研究方向为光固化、生物基材料,通讯联系人,lunwenpfp@126.com。