纳米氧化铝改性3D打印光敏材料的制备及性能研究

Preparation and Performance Research of Nano-alumina Modified 3D Printing Photosensitive Material

采用硅烷偶联剂A151对纳米氧化铝进行表面处理,将其作为增强相改性三维(3D)打印光敏树脂。通过红外光谱分析表明在不改变氧化铝晶型情况下,A151成功接枝于纳米氧化铝分子表面。考察了改性纳米氧化铝不同粒径、不同添加量及不同粒径复配比对材料力学性能、热稳定性及收缩率影响。结果表明,200 nm氧化铝改性光敏树脂比50 nm氧化铝改性光敏树脂力学性能和固化后收缩作用更为优异,但热稳定性略差于50 nm氧化铝。不同粒径氧化铝复配改性光敏树脂优于单一组分改性。当以(50 nm∶200 nm)0.6∶2.4氧化铝复配时,光敏树脂综合性能最优,硬度达到85.5 HD,拉伸强度52.36 MPa,断裂伸长率33.11%,冲击强度10.12 kJ/m^(2)。

The surface treatment of nano-alumina was performed with silane coupling agent vinyl triethoxy silane(A151),which was used as a reinforced phase modification three dimensional(3 D)printing photosensitive resin.The analysis by infrared spectroscopy shows that A151 is successfully grafted onto the surface of nano-alumina molecules without changing the alumina crystal form.The effects of different particle sizes, different addition amounts and different particle size compound ratios on the mechanical properties, thermal stability and shrinkage of the modified nano-alumina are investigated.The results show that the 200 nm alumina modified photosensitive resin has better mechanical properties and shrinkage after curing than the 50 nm alumina modified photosensitive resin, but the thermal stability is slightly worse than that of 50 nm alumina.Alumina compound modified photosensitive resin with different particle sizes is better than single component modification.When compounded with(50 nm: 200 nm)0.6:2.4 alumina, the photosensitive resin has the best overall performance, with hardness of 85.5 HD,tensile strength of 52.36 MPa, elongation at break of 33.11%,and impact strength of 10.12 kJ/m^(2).