论文部分内容阅读
纳米二氧化钛(TiO2)的团聚和分散是制备水基型纳米TiO2防腐剂的关键问题。采用光度分析法、XRD分析技术、扫描电镜和FTIR分析技术分别研究了钛酸酯NDZ-105、六偏磷酸钠对TiO2的分散性能的影响,改性前后TiO2晶型变化及改性TiO2在木材中的分布与界面特征。结果表明:纳米TiO2悬浮液的分散性随两种分散剂的添加量增加而呈现先增大后减小的趋势,当钛酸酯NDZ-105为5%、六偏磷酸钠添加量为3%～5%时可得到分散性能稳定的纳米TiO2防腐剂;分散改性后的纳米TiO2,保持了锐钛矿的晶体衍射特征;改性后TiO2粒子成功进入木材内部,呈颗粒状或球状,TiO2与木材纤维素发生氢键结合和共价键结合,3-碘-2-丙炔基丁基氨基甲酸丁酯(IPBC)仅与木材纤维素发生氢键结合。
Nano-titanium dioxide (TiO2) agglomeration and dispersion of water-based nano-TiO2 preservatives is the key issue. The effects of titanate NDZ-105 and sodium hexametaphosphate on the dispersion properties of TiO2 were investigated by photometric analysis, XRD analysis, scanning electron microscopy and FTIR analysis. The changes of the crystalline form of TiO2 before and after modification and the photocatalytic activity of modified TiO2 on wood In the distribution and interface features. The results show that the dispersion of nano-TiO2 suspensions tends to first increase and then decrease with the addition of two dispersants. When titanate NDZ-105 is 5%, the amount of sodium hexametaphosphate added is 3% ~ 5% nano-TiO2 preservatives can be dispersed stability; dispersed modified nano-TiO2, maintaining the anatase crystal diffraction characteristics; modified TiO2 particles into the wood interior, was granular or spherical, TiO2 With the hydrogen bonding and covalent bonding of wood cellulose, 3-iodo-2-propynylbutyl butylcarbamate (IPBC) only hydrogen bonds with wood cellulose.