膨胀玻化微珠表面改性及其机理研究

Surface Modification and Its Mechanism of Expanded and Vitrified Bead

分别使用无机矿粉、胶乳、乳化硅油对膨胀玻化微珠进行表面改性,对比三种改性剂对膨胀玻化微珠的堆积密度、体积吸水率、筒压强度的影响,并对表面改性机理进行了分析。结果表明:三种改性剂均能有效作用于玻化微珠表面,无机矿粉在玻化微珠开口孔和表面生成水化产物对其进行封堵与包裹,乳化硅油在玻化微珠表面形成一层硅烷的憎水层,胶乳在玻化微珠表面形成具有一定厚度的胶粘膜包裹层。无机矿粉可有效增加玻化微珠的筒压强度,乳化硅油可高效降低玻化微珠吸水率,胶乳可提高玻化微珠的筒压强度及降低吸水率,是一种有效的玻化微珠表面改性剂。

Respectively using inorganic mineral powder, latex, emulsified silicone oil, the surface modification of expanded and vitrified bead was studied. The influence of three kinds of modifier on the bulk density, volume water absorption and volume floating rate, numerical tube pressure, are compared, and the mechanism of surface modification is analyzed. Results show that three kinds of modifiers can be effective action on the surface of vitrified bead, the hydration product of inorganic mineral powder can coat the surface and seal the open pore of vitrified bead, the emulsified silicone oil can form a hydrophobic layer of silane on the surface of vitrified bead, the latex can form a certain thickness adhesive film to coat the surface of vitrified bead. The inorganic mineral powder can effectively increases the numerical tube pressure of vitrified bead, the emulsified silicone oil can effectively reduces the volume water absorption rate of vitrified bead, the latex which can improve the numerical tube pressure and reduce the volume water absorption rate is an effective surface modification agent of vitrified bead.