超细SiO_2颗粒废料的表面改性

Surface Modification of Waste Ultrafine Silicon Dioxide

以通信光纤生产中产生的超细二氧化硅颗粒废料为原料,经水纯化处理后,用硅烷类偶联剂对其表面进行化学改性.傅立叶红外光谱和热重分析结果表明,改性后的超细二氧化硅颗粒表面的硅羟基吸收峰明显减小,热失重增加,表明其与硅烷类偶联剂发生了化学键合;激光光散射和扫描电字显微镜的测定结果发现,改性后的超细二氧化硅颗粒粒径减小,颗粒分散性大大提高,在电镜照片中无明显的大团聚体,表明超细二氧化硅颗粒表面键合了疏水性有机分子链,疏水性增强,达到了改性目的,为超细二氧化硅废料的回收利用提供了广阔的市场.

The surface modification with silicon coupling reagent to ultrafine silicon dioxide, which roots in waste production in fiber manufacturing, was investigated in this paper. The experimental results show that the surface Si-OH bonds infrared intensity of ultrafine silicon dioxide was decreased and thermogravimetric loss was increased by using Fourier infrared（FTIR） spectroscopy and thermogravimetric（TG） analyzer. The result also indicates the surface Si-OH bonds of ultrafine silicon dioxide has reacted with silicon coupling reagent. By using laser light scattering（LLS） and scanning electron microscopy（SEM）, the particle sizes of ultrafine silicon dioxide diminish and the congeries dispersibility were obviously improved, which shows that the hydrophobic property of ultrafine silicon dioxide after being modified has been much more strengthened, This surface modification provides wide market to reuse ultrafine silicon dioxide waste material.