摘要
通过溶胶-凝胶法制备了锐钛矿型的纳米TiO_2,用改进的Hummers法制备了氧化石墨烯,用水热法合成了纳米TiO_2/石墨烯复合材料。采用异佛尔酮二异氰酸酯和聚乙二醇1000为反应单体,二月桂酸二丁基锡为催化剂,二羟甲基丙酸作为扩链剂,并以甲基丙烯酸羟乙酯封端,成功制备出水性聚氨酯预聚体。将TiO_2/石墨烯复合材料引入UV固化聚氨酯体系,制备了含有不同质量分数复合材料的聚氨酯涂层。采用扫描电子显微镜、X射线粉末衍射、傅里叶变换红外光谱、紫外-可见分光光度计等手段对样品进行表征,分析了材料的形貌、组成、结构及光催化降解性能。结果表明,TiO_2/石墨烯复合材料改性水性聚氨酯涂料表现出了较好的光催化性能。280nm紫外光照射下24h之内对甲基橙降解率达到77.20%,而在可见光条件下复合材料对甲基橙降解率达到57.52%。经改性的聚氨酯涂层的各项力学性能有了不同程度的提高。
Anatase type nano-TiO2 was prepared by sol-gel method,and graphene oxide was prepared by modified Hummers method,then nano-TiO2/graphene composites were synthesized by hydrothermal method.Using isophorone diisocyanate and polyethylene glycol 1000 as reaction monomer,dibutyltin dilaurate as catalyst,dimethylol propionic acid as chain extender and methacrylic acid hydroxyethyl ester-terminated,the waterborne polyurethane prepolymer was prepared.Polyurethane coated with different mass fraction of TiO2/graphene composites was prepared by adding TiO2/graphene composites into the polyurethane system.SEM,XRD,FT-IR,and UV-Vis spectroscopy were used to analyze the morphology,composition,structure and photocatalytic degradation of composites.The results show that TiO2/graphene composites show good photocatalytic performance.The degradation rate of methyl orange reaches 77.20% for 24 h under ultraviolet irradiation,which is better than that filled with pure TiO2.The degradation rate of TiO2/graphene to methyl orange is 57.52%under visible light condition,while pure TiO2 has little degradation ability.Mechanical properties of polyurethane coatings modified with TiO2/graphene composites are improved in various degrees.
作者
欧阳思
任长靖
程俊
陈刚
黄华莹
李珍珍
赵强
Si Ouyang;Changjing Ren;Jun Cheng;Gang Chen;Huaying Huang;Zhenzhen Li;Qiang Zhao(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;Sichuan Carpoly Paint Co.Ltd,Chengdu 611330,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2018年第12期13-19,共7页
Polymer Materials Science & Engineering
基金
四川大学-四川嘉宝莉涂料有限公司合作项目(16H0755
16H0295)
四川省重点研发项目(2018GZ0490)
关键词
二氧化钛
石墨烯
纳米复合材料
水性聚氨酯
紫外光固化
titanium dioxide
graphene
nanocomposites
waterborne polyurethane
ultraviolet light curing
