摘要
采用纳米TiO_2直接加入及预聚体分散法,制备了稳定的纳米TiO_2-聚氨酯复合乳液.考察了纳米TiO_2改性、加入方式、用量、不同R(n_(-NCO)/n_(-OH))值等影响因素,发现通过硅烷偶联剂(KH-570)、二甲苯改性的纳米TiO_2沉降性有较大改善,分散在介质中呈良好乳液状;反应初直接加入TiO_2合成的纳米TiO_2-聚氨酯在手感上优于其它加入方式,力学强度较高;当R值为3.5时、纳米TiO_2加入量控制在0.5%以内获得的纳米TiO_2-聚氨酯杂化材料性能优良,铅笔硬度大于2H,耐冲击强度大于80 cm,粒子平均粒径在100 nm以内。
By the method of the direct addition of nano TiO2 and pre-polymer dispersion, nano TiO2-polyurethane composite emulsion was successfully prepared. After studying some relavant factors, such as modifying measures of nano-TiO2, adding mesaures and amount of nana-TiO2 as well as the differenet ratio（n Nco/n-oH）, the results showed that the selttleability of nano-TiO2, modified by the nature of KH-570 and xylene, gains a large improvement, with fine emulsion shape in dispersible media, that the coat of nano-TiO2/aqueous polyurethane obtained by adding the modified nano-TiO2, after the mix of PPG, feels better and its Strength was also improved; What＇s more, the nano- TiO2/aqueous polyurethane produced when ratio（n-Nco/n-oH） was 3. 5 and the amount of nano-TiO2 was controled within 0.5 %, can make the pencil hardness beyond at least 2H, and it bears the impact strength to be stronger than 80 cm. Under this case, particle
出处
《华中师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第3期432-435,共4页
Journal of Central China Normal University：Natural Sciences
基金
福建省科技厅资助项目(2008F504020104)
