costsavingwithsuperdurableTiO2例析.ppt

1/3/2005 耐候型钛白粉之设计原理与应用选择 TiO2 表面包膜处理 漆膜(树 脂/基 料) 降 解 机 理 钛白粉保护树脂基料 颜 料 分 散 之 好 坏 对 油 漆 耐 候 性 之 影 响 漆膜经天然曝晒后的扫描电子显微镜照片 基料崩溃(降解) 由TiO2 光催化而引起的降解率 基料本身的直接降解率 基料崩溃(降解)基料本身的直接降解率由TiO2 光催化而引起的降解率 有两种降解反应: 直接降解反应 光催化降解反应 钛白粉对两种反应都有影响 对漆膜耐候性都有牵连. 分散性表面处理 TS-6200 突出的耐候性汽车修补漆 – 氙灯曝晒 TS-6200 突出的耐候性传统卷材漆 – 氙灯曝晒 TS-6200 突出的耐候性脂肪族卷材漆 – QUV曝晒 TS-6200 突出的耐候性抗粉化 – 佛罗里达曝晒 分散 vs. 研磨能量酸漆研磨 颜基比 P/B=2:1 分散剂用量最少-Tamol 1124 30 32 34 36 38 40 42 44 R-960 历史平均值 R-960 在 同一系列中 R-706历史平均值 耐候性 TS-6200 超耐候竞争产品 0 5 10 15 20 25 30 35 40 1 min 650 RPM +3 min 650 RPM +5 min 1750 RPM +5 min 3000 RPM 研磨条件 大的散射颗粒数 TS-6200 R-960 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.000 0.100 0.200 0.300 0.400 0.500 Wt % 分散剂用量 粘度 TS-6200 R960 R706 锐钛型 钛白粉 Remember that a perfectly smooth surface is required for good gloss (and good gloss retention). Also recall that some binders are more reactive than others (that is, some binders are very susceptible to direct degradation) In this chart are shown paints, made with two different grades of TiO2 (high durability and low durability) and two different binders (very reactive and very inert). Before exposure, all four paints have a very smooth surface and so have the same good gloss. After exposure, though, the situation is different: In case 1 (reactive binder, non-durable pigment), much of the surface has eroded, but it has done so evenly, so it is still smooth. In case 2 (inert binder, non-durable pigment), only the binder near the pigment particles has eroded. This leaves pits, which roughen the surface. In case 3 (reactive binder, durable pigment), much of the binder has eroded. However, the binder beneath the TiO2 particles is protected from UV light, so does not degrade. This leads to the formation of pillars, which make the surface very rough. Finally, in case 4 (inert binder, durable pigment), there is very little erosion at all, and so the surface remains smooth. In the next 2 slides I’ll show you real life examples of poor gloss retention as prod