摘要
光固化3D打印技术因成型速度快、器件精度高、表面质量好,已成为3D打印快速制备高精尖器件的首选方法,但现有3D打印光敏树脂仍存在器件力学强度低、韧性差等问题。碳纤维因导电、导热、高比强度、高比模量等特性,已被广泛应用于各种结构或功能复合材料。为此,先采用化学氧化、硅烷偶联剂(KH580)改性等手段对短切碳纤维进行表面改性得到KH580改性碳纤维(MCF);再将MCF与3D打印光敏树脂(PR)复合得到改性碳纤维/光敏树脂(MCF/PR)复合材料,并对其光固化动力学和3D打印器件的力学性能进行了详细研究。结果表明:当MCF表面的KH580接枝量为0.5wt%、MCF添加量为0.15wt%时,虽然MCF与PR复合后使光敏树脂的黏度有所增大,但对光敏树脂的固化深度与临界曝光量影响较小,仍能满足光固化3D打印要求;利用立体光刻技术(Stereolithography,SLA)光固化3D打印工艺能很好地制造出各种MCF/PR器件,器件的拉伸强度可达70 MPa,与纯PR相比增加了约100%,冲击强度为1.91 kJ/m^(2),较PR提高了约60%,且3D打印器件在350℃下具有良好的热稳定性。
Due to the fast curing speed, high precision and smooth surface, UV-curing 3D printing has become one of the preferred technologies to rapidly manufacture sophisticated devices. However, the photosensitive resins for UV-curing 3D printing are still challenged by poor mechanical strength and toughness. Carbon fiber has been widely utilized in diverse structural or functional composites because of its excellent characteristics like electrical conductivity, heat conductivity, high specific strength and high specific modulus. Therefore, modified short carbon fiber(MCF) was prepared by chemical oxidation and modification with silane coupling agent(KH580). Then, the modified carbon fiber/photosensitive resin(MCF/PR) composite was prepared by compositing MCF with 3D printing photosensitive resin(PR). The UV-curing kinetics of MCF/PR composite and mechanical performances of 3D printed samples were also studied. The results indicate that when the grafted amount of KH580 is 0.5wt% and the content of MCF is 0.15wt%, the viscosity of MCF/PR composite is increased to some extent, but the curing depth and critical exposure are insignificantly influenced by MCF, which still meets the requirements of UV-curing 3D printing. A variety of devices are successfully fabricated by stereolithography(SLA) 3D printing. The tensile strength and impact strength of 3D printed samples are 70 MPa and 1.91 kJ/m^(2), respectively, which are increased by about 100% and 60% compared with pure PR. Moreover, the 3D printed MCF/PR composite has good thermostability below350℃.
作者
王世崇
陈彦羽
侯阳
邓浩宇
刘晓暄
向洪平
彭忠泉
容敏智
章明秋
WANG Shichong;CHEN Yanyu;HOU Yang;DENG Haoyu;LIU Xiaoxuan;XIANG Hongping;PENG Zhongquan;RONG Minzhi;ZHANG Mingqiu(Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter,School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Kingfa Sci.&Tech.CO.,LTD.,Guangzhou 510700,China;Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education,GD HPPC Lab,School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2022年第10期4509-4517,共9页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51873043,21604014)。
关键词
光固化3D打印
改性碳纤维
光敏树脂复合材料
光固化动力学
增强增韧
UV-curing 3D printing
modified carbon fiber
photosensitive resin composite
UV-curing kinetics
reinforcing and toughening
