纳米粒子改性LDPE透明薄膜的制备及其紫外线屏蔽性能研究  

Preparation and properties of transparent UV-Resistant LDPE films modified by nanoparticles

作　　者：吴宇涛 卢立新 潘嘹 卢莉璟 Wu Yutao;Lu Lixin;Pan Liao;Lu Lijing(School of Mechanical Engineering,Jiangnan University,Wuxi 214122;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment&Technology,Wuxi 214122)

机构地区：[1]江南大学机械工程学院,无锡214122 [2]江苏省食品先进制造装备技术重点实验室,无锡214122

出　　处：《化工新型材料》2020年第4期68-72,共5页New Chemical Materials

基　　金：国家重点研发计划课题(2016YFD0400701)。

摘　　要：使用粒径不同的纳米粒子TiO2、ZnO对低密度聚乙烯(LDPE)进行改性,通过双螺杆挤出设备得到纳米TiO2、ZnO改性LDPE母粒,使用共挤流延设备制备了厚度(40±2)μm的改性LDPE薄膜,研究了不同粒径纳米粒子对改性LDPE薄膜紫外屏蔽性能的影响。通过紫外分光光度计、透明度-雾度测量仪、扫描电子显微镜、差示扫描量热仪等对改性前后的LDPE薄膜进行表征。结果表明,用不同粒径纳米粒子改性的LDPE薄膜,其屏蔽紫外线的效果存在明显差异;纳米粒子平均粒径50nm的改性LDPE/纳米TiO2薄膜在波长280~380nm条件下,紫外线光谱透射比小于30%,透光度大于80%,机械性能较优;纳米粒子平均粒径30nm的改性LDPE/纳米ZnO薄膜具有较强的紫外线屏蔽效果。The LDPE films(40±2μm)were modified with nano-particles TiO2and ZnO with different particle sizes in the twin-screw extrusion equipment.The effects of inorganic metal oxide fillers with different particle sizes on the UV resistance of LDPE films were investigated.The LDPE films before and after modification were characterized by UV spectrophotometer,transparency-haze measuring instrument,scanning electron microscope and DSC.The results show that the LDPE films modified with nano-particles with different particle diameters have obvious differences in the effect of shielding ultraviolet rays.The films modified with nano-TiO2(50nm)have higher UV shielding effect at a wavelength of 280~380nm,light transmittance over 80%,excellent mechanical properties.The film modified with nano-ZnO(30nm)has a strong ultraviolet shielding effect.

关 键 词：纳米粒径 透光度 紫外线屏蔽 低密度聚乙烯薄膜 

分 类 号：TS206.4[轻工技术与工程—食品科学] TB383.1[轻工技术与工程—食品科学与工程]