摘要
以异丙醇铝(AIP)为原料,聚氨酯(PU)作为偶联剂,采用溶胶-凝胶法,制备了较为稳定的功能化纳米Al2O3/PU溶胶。通过研究凝胶制备工艺过程中的水解温度、水铝比(摩尔比)、酸铝比(摩尔比)、酸解剂、以及陈化温度和时间等因素对溶胶粒径和粘度等的影响,得到了制备稳定、透明功能纳米Al2O3溶胶的最佳工艺条件,即水解温度:80℃;n(H2O)/n(Al3+)=105;n(H+)/n(Al3+)=0.24;酸解剂:HNO3;陈化温度:80℃;陈化时间:24 h。采用纳米粒度分析仪、红外光谱分析(FI-IR)等手段对溶胶的性能和结构进行了表征,结果表明:功能化纳米Al2O3/PU溶胶的粒径范围在40-120 nm之间,粘度范围在4-10 mPa.s,而且PU的添加使得亲水性集团羟基,碳碳双键和酮羰基等化学键基团成功地引入到Al2O3/PU溶胶,使得AIP和PU之间通过化学键更好的交联,增强了溶胶的强度。
The functionalized nanoAl2O3/PU sol was prepared in a sol-gel process, using aluminium isopropoxide （AIP） as raw material and polyurethane （PU） as a coupling agent. The effects of hydrolysis temperature, n（HEO）/n（A13＋）, n（H＋）/n（Al3＋）, peptization agent, aging temperature and time on the particle size and viscosity of the sol were studied. The optimal conditions for preparing stable and transparent functionalized nano-A1203 sol were obtained as hydrolysis temperature 80 ℃, n（HEO）/n（A13＋） 105, n（H＋）/n（A13＋） 0.24, HNO3 as peptization agent, aging temperature 80 ℃ and aging time 24 h. The properties and structure of the sol were characterized by Nano particle analyzer and FI-IR. The results indicated that the particle size and viscosity of Al2O3/PU sol ranged from 40 to 120 nm and 4 to 10 mPa s, respectively. C=C double bond and the hydrophilic groups, such as hydroxyl group and carboxyl group were successfully introduced to the functionalized nano-Al2O3/PU sol, which can enhance the chemical bond between AIP and PU and increase the slrength of the sol.
出处
《现代食品科技》
EI
CAS
北大核心
2013年第8期1906-1910,1850,共6页
Modern Food Science and Technology
基金
国家自然科学基金项目(21176092)
