摘要
采用硅烷偶联剂(KH570)以及偶联剂和有机物(山梨醇、油酸、钛酸酯、聚乙二醇6000)复合对纳米二氧化钛(TiO_2)进行表面改性,研究了偶联剂和复合改性剂对纳米TiO_2抗紫外性能的影响。通过扫描电子显微镜、二次粒径分析、沉降试验、傅里叶变换红外光谱、同步热分析等对改性前后的纳米TiO_2进行表征。结果表明,KH570+聚乙二醇6000复合改性的纳米TiO_2二次粒径最小,平均粒径为0.047μm;沉降试验中其上清液在350 nm处的吸光度达最高为1.067 76;吸油值最大达86.19 cm^3/g,呈现良好的分散性和疏水性。另外,KH570+聚乙二醇6000改性的纳米TiO_2具有相对最强的紫外吸收能力,而且对亚甲基蓝溶液的降解率相对最小。将改性后的纳米TiO_2添加到PVC基体中,制得PVC/TiO_2薄膜,该薄膜经120 h加速老化后,发现由KH570+聚乙二醇6000改性纳米TiO_2制得的PVC薄膜的光透过率相对最低,拉伸性能最高,体现了其相对优越的抗紫外性能以及KH570+聚乙二醇6000相对优异的改性效果。
Surface of nanometer titanium dioxide （nano-TiO2） was modifled by silane coupling agent （KH570） and compound modiflers of KH570 with organics [sorbitol, oleic acid, titanium acid ester, polyethylene glycol 6000 （PEG6000）]. The influences of coupling agent and different compound modiflers on the anti-ultraviolet capability of nano-TiO2 were studied. The nano-TiO2 before and after modifled was characterized by scan electron microscope, secondary particle size analysis,the sedimentation test,fourier transform infrared spectroscopy,simultaneous thermal analysis. The results show that the nano-TiO2 modifled by compound modi-fler KH570 ＋PEG6000 has a minimum secondary particle size,and the average particle size is 0.047 μm,the absorbance of its supernate at sedimentation experiment is up to the highest of 1.067 76 at 350 nm, its oil absorption value is up to the maximum of 86.19 cm3/g,and the dispersibility and hydrophobicity are good. In addition, the nano-TiO2 modifled by KH570 ＋PEG6000 has the strongest ultraviolet absorption ability,and the lowest degradation rate to methylene blue solution. The PVC fllms were made through adding the modifled nano-TiO2 into the poly（vinyl chloride） （PVC） matrix. The UV transmittance of those PVC fllms were received by accelerated aging for 120 h. It showes that the PVC fllms with nano-TiO2 modifled by KH570＋PEG6000 has a relatively lowest UV transmittance and highest tensile properties, which presents relatively superior resistance to ultraviolet and relatively ex-cellent modiflcation effects of KH570 ＋PEG6000.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2017年第1期101-106,共6页
Engineering Plastics Application
基金
青海省盐湖资源综合利用重点实验室开放基金项目(Q-SYS-2014-KF-01)
青海省昆仑学者项目
关键词
复合改性
纳米二氧化钛
聚氯乙烯
硅烷偶联剂
分散性
抗紫外性能
composite modifying
nano titanium dioxide
poly（vinyl chloride）
silane coupling agent
dispersion
UV resis-tant property
