可直写成型的光固化聚氨酯浆料制备及应用  

Preparation and Application of UV-curable Polyurethane Ink for Direct Ink Writing

作　　者：弓晓婷 李婧[2] 张帅[2] 李波[2] 杨军校 GONG Xiaoting;LI Jin;ZHANG Shuai;LI Bo;YANG Junxiao(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,Sichuan,China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《西南科技大学学报》2019年第4期20-26,共7页Journal of Southwest University of Science and Technology

摘　　要：针对聚氨酯泡沫增材制造的需求,以4,4'-二苯基甲烷二异氰酸酯(4,4'-MDI)、异佛尔酮二异氰酸酯(IPDI)、聚醚多元醇(N220)、甲基丙烯酸羟乙酯(HEMA)及季戊四醇三丙烯酸酯(PETA)为原料,制备了一系列多官能度的聚氨酯丙烯酸酯(PUA)浆料。从直写成型对浆料挤出、保型的要求出发,研究了官能度以及光引发剂对浆料的光固化特性的影响,分析了浆料自身的流变特性及外源固化对浆料流变特性的影响,并对浆料的可打印性进行了验证。结果表明:以4,4'-MDI,N220和PETA为原料制备的MPUA-6浆料固化速度更快(1 s左右),更适合作为直写成型的浆料;光引发剂2,4,6-三甲基苯甲酰基膦酸乙酯(TPO-L)引发效果比1-羟基环己基苯酮(184)更好,且TPO-L的最佳添加质量分数为3%;MPUA-6浆料具有明显的剪切变稀行为,说明浆料能够在打印过程顺利挤出,避免针头堵塞;当曝光强度为290 m W/cm^2时,利用直写成型技术实现了具有稳定搭接点和跨度的木堆积结构。Aiming at the demand of additive manufacturing of polyurethane foam,a series of polyurethane acrylate(PUA)with different average functionalities were prepared by 4,4'-diphenylmethane diisocyanate(4,4'-MDI),isophorone diisocyanate(IPDI),polyether polyol N220(N220),2-hydroxyethyl methacrylate(HEMA)and pentaerythri toltriacrylate(PETA).Based on the requirements of direct ink writing for extrusion and shape-retaining ability of the ink,the effects of functionality and photoinitiator on curing property of ink were studied.Then the rheological property of ink itself and effects of external curing on rheological property of ink were investigated.Lastly,the printability of ink was tested.The results show that the ink(MPUA-6)synthesized by 4,4'-MDI,N220 and PETA can be cured more rapidly(about 1 s),so it is more suitable as the ink for direct ink writing.The initiation effect of photoinitiator ethyl(2,4,6-trimethylbenzoyl)phenylphosphinate(TPO-L)is better than 1-hydroxycyclohexyl phenyl ketone(184)and the optimum content of TPO-L is 3%.More importantly,the evident shear thinning behavior of MPUA-6 ink indicates that it can be extruded smoothly during printing process which sufficiently avoids needle blockage.In particular,the wooden stacking structure by direct ink writing with stable nodes and spans is obtained when the exposure power is 290 mW/cm 2.

关 键 词：聚氨酯丙烯酸酯 光固化特性 3D打印 

分 类 号：TQ328.3[化学工程—合成树脂塑料工业]