纳米SiO_2杂化粒子的制备及其性能研究

以异佛尔酮二异氰酸酯（IPDI）与纳米SiO2表面Si—OH基团进行反应,制备了表面含—NCO基团的功能化纳米SiO2粒子,进一步用丙烯酸羟乙酯（HEA）对剩余—NCO基进行封端,制备出纳米SiO2/丙烯酸酯粒子,并用红外光谱（FI-IR）、热失重（TGA）、扫描电镜（SEM）等对改性前、后纳米SiO2的分散性进行表征。结果表明,IPDI和HEA均成功地以化学键形式接枝到纳米SiO2表面,接枝率为46.80%;改性纳米SiO2的分散性显著提高,团聚现象明显改善;将不同含量纳米SiO2杂化材料加入紫外光固化涂料中,同比加入未改性纳米SiO2的涂料,改性后的纳米SiO2在使涂料获得较低黏度和较快CC转化率的同时,可以显著地提高固化膜的硬度。

Preparation and properties of nanosilica hybrid particle

The nanosilica with-NCO on the surface was prepared,using of the characteristic-OH on the surface of nanosilica could react with IPDI,which was further reacted with HEA,the ploymerizable nanosilica hybrid particle was prepared.The nanosilica and modified nanosilica were characterized with FTIR,TGA and SEM.The results indicated that IPDI and HEA had been grafted on the surface of nanosilica with chemical bond form and the grafting ratio was 37.29%,the dispersibility of grafted nanosilica was better than that of unmodified nanosilica,the aggregation phenomena was improved.Compared with the coating with unmodified nanosilica,the UV curable coating with the same ratio nanosilica hybrid material had lower viscosity and faster CC double bonds conversion,the hardness of the curable film was improved obviously.