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发明公开
CN103436054A 一种钛白粉的低粘度包膜方法 有权

一种钛白粉的低粘度包膜方法
摘要：
本发明提供了一种钛白粉的低粘度包膜方法。所述方法包括以下步骤：向钛白粉浆料中加入分散剂；加入硫酸锆溶液并熟化，其中，加入的硫酸锆溶液以ZrO2计与钛白粉浆料中TiO2的质量比为0.2:100～0.5:100；加入偏铝酸钠溶液以将浆料的pH值控制在7.0～11.0，熟化；加入硫酸铝溶液以将浆料的pH值控制在2.5～6.5，熟化；加入偏铝酸钠溶液以将浆料的pH值控制在8.5～10.5，熟化；调节浆料的pH值为7.0～7.8，熟化。本发明通过在包膜前加入分散剂改善钛白粉浆料的分散状况，并采用特殊的包膜工艺，有效减低包膜过程的粘度，有利于包膜剂在钛白粉表面均匀沉积，提高包膜的均匀性，从而提高产品的亮度和分散性。
摘要（英）：

The invention provides a low viscosity enveloping method of titanium dioxide. The method comprises the following steps: adding a dispersant into titanium dioxide slurry; adding zirconium sulfate liquor and curing, wherein the mass ratio of the added zirconium sulfate liquor is calculated based on the ZrO2, and the mass ratio of ZrO2 ZrO2 and TiO2 in the titanium dioxide slurry is (0.2:100)-(0.5:100); adding sodium metaaluminate liquid to control the pH value of the slurry within 7.0-11.0 and curing; adding aluminum sulfate liquor to control the pH value of the slurry within 2.5-6.5, and curing; adding sodium metaaluminate liquor to control the pH value of the slurry within 8.5-10.5, and curing; and adjusting the pH value of the slurry within 7.0-8.07.8, and curing. According to the method provided by the invention, the viscosity of the enveloping process is effectively reduced by adding the dispersant to improve the dispersing condition of the titanium dioxide slurry before enveloping and adopting a special enveloping process, so that the enveloping agent is uniformly deposited on the surface of titanium dioxide beneficially so as to improve the enveloping uniformity, thereby improving the brightness and dispersity of the product.

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