双固化3D打印弹性体光敏树脂的制备与性能

Preparation and Properties of Photosensitive Inks for Double Curing 3D Printing Elastomers

采用双固化体系设计,合成制备了两步固化可3D打印弹性体的光敏树脂。使用甲乙酮肟对聚氨酯预聚体进行封端,并通过红外光谱和差示扫描量热分析确定其对应的最佳解封温度为120℃;采用不同的丙烯酸酯类稀释剂配制光固化P树脂部分,与封闭聚氨酯预聚体及扩链剂组成的T树脂配制了双固化体系光固化3D打印树脂,采用平板流变仪确定了其打印温度应控制在30~35℃;对固化后的样品进行力学性能测试,发现当稀释剂采用玻璃化转变点高的稀释单体时,制备样品力学性能最好,接近于浇筑聚氨酯弹性体,在室温能保持良好的弹性。

The photosensitive ink with two-stage curing and 3 D printing elastomer was synthesized by using double-curing system design.The polyurethane prepolymer was blocked with methyl-acetone oxime,and the optimal unsealed temperature was determined to be 120℃by FT-IR and DSC.Different acrylate diluents were used to prepare the photocurable P resin part,and the T resin composed of blocked polyurethane prepolymer and chain extender was configured with a double curing system of photocurable 3 D printing ink.A flat plate rheometer was used to determine that the printing temperature should be controlled at 30~35℃.The mechanical properties of the samples after curing were tested,and it is found that when the diluted monomer with high glass transition temperature is used as diluent,the mechanical properties of the prepared samples are the best,close to those of the poured polyurethane elastomer and could maintain good elasticity at room temperature.