阅读说明：本技术 钛白粉有机改性的方法 (Method for organically modifying titanium dioxide ) 是由 刘婵 路瑞芳 吴健春 于 2019-10-29 设计创作，主要内容包括：本发明属于钛白粉改性技术领域,具体涉及一种钛白粉有机改性的方法。针对现有钛白粉有机改性方法对分散性、遮盖力的改善效果不好的问题,本发明提供了一种钛白粉有机改性的方法,步骤如下：a、钛白粉无机包膜的陈化阶段,将含TiO<Sub>2</Sub>的无机包膜浆料的温度稳定在45～65℃,保温搅拌；b、将浆料pH调至6.0～8.8范围内,保温搅拌；c、添加有机处理剂,继续保温搅拌；d、将钛白粉浆料过滤,洗涤；e、将钛白粉滤饼干燥并粉碎,得到有机改性的钛白粉。本发明能够有效改善有机处理剂在钛白粉粒子表面的吸附均匀性和稳定性,进而提高钛白粉的分散性。采用本方法改性获得的钛白粉分散性优良,具有良好的应用和推广价值。(The invention belongs to the technical field of titanium dioxide modification, and particularly relates to a titanium dioxide organic modification method. Aiming at the problem that the existing titanium dioxide organic modification method is poor in improvement effect on dispersibility and covering power, the invention provides a titanium dioxide organic modification method, which comprises the following steps: a. at the aging stage of inorganic coating of titanium dioxide, TiO-containing titanium dioxide is added 2 The temperature of the inorganic coating slurry is stabilized at 45-65 ℃, and the inorganic coating slurry is stirred while being kept warm; b. adjusting the pH value of the slurry to be within the range of 6.0-8.8, and stirring at a constant temperature; c. adding an organic treating agent, and continuing to keep the temperature and stir; d. filtering and washing the titanium dioxide slurry; e. and drying and crushing the titanium dioxide filter cake to obtain the organic modified titanium dioxide. The invention can effectively improve the effect of the organic treating agent on titanium dioxide particlesThe adsorption uniformity and stability of the surface are improved, and the dispersibility of the titanium dioxide is improved. The titanium dioxide modified by the method has excellent dispersibility and good application and popularization values.)

1. The method for organically modifying titanium dioxide is characterized by comprising the following steps:

a. titanium (IV)Aging stage of inorganic coating of white powder, and adding TiO₂Stabilizing the temperature of the inorganic coating slurry at 45-65 ℃, and stirring while keeping the temperature;

b. adjusting the pH value of the slurry to be within the range of 6.0-8.8, and stirring at a constant temperature;

c. adding an organic treating agent, and continuing to keep the temperature and stir;

d. filtering and washing the titanium dioxide slurry;

e. and drying and crushing the washed titanium dioxide filter cake to obtain the organic modified titanium dioxide.

2. The method for organically modifying titanium dioxide according to claim 1, characterized in that: the heat preservation temperature in the steps a, b and c is 45-65 ℃.

3. The method for organically modifying titanium dioxide according to claim 1, characterized in that: the stirring time in the steps a and b is 10-60 min.

4. The method for organically modifying titanium dioxide according to claim 1, characterized in that: and c, stirring for 10-40 min.

5. The method for organically modifying titanium dioxide according to claim 1, characterized in that: the organic treating agent in the step c is organic silicon or polyol.

6. The method for organically modifying titanium dioxide according to claim 1, characterized in that: the addition amount of the organic treating agent in the step c is TiO₂0.10 to 1.00% of the mass of (A).

7. The method for organically modifying titanium dioxide according to claim 1, characterized in that: and d, filtering by adopting filter cloth with the number of warp and weft lines not less than 64/13/cm.

8. The method for organically modifying titanium dioxide according to claim 1, characterized in that: and d, washing by using desalted water, wherein the temperature of the desalted water is 45-65 ℃.

9. The method for organically modifying titanium dioxide according to claim 1, characterized in that: the amount of the desalted water in the step d is TiO₂15 to 25 times of the mass of (A).

10. The method for organically modifying titanium dioxide according to claim 1, characterized in that: the drying in step e is one of flash drying or spray drying.

Technical Field

The invention belongs to the technical field of titanium dioxide modification, and particularly relates to a titanium dioxide organic modification method.

Background

Titanium dioxide is an important inorganic white pigment and is widely applied to the fields of organic chemical industry such as printing ink, coating, plastics and the like. In the application process of titanium dioxide, the titanium dioxide needs to be subjected to surface treatment first to enable the application performance of the titanium dioxide to meet the corresponding requirements. At present, the surface treatment mode of titanium dioxide comprises inorganic coating and organic modification. The organic modification method generally adopts a physical adding and mixing mode to add an organic modifier in the flash drying or steam flow crushing process, and the method has the defects of uneven surface modification of the titanium dioxide, poor adsorption effect of the organic treatment agent on the surface of the titanium dioxide and the like, so that the improvement effect of the dispersibility and the covering power of the titanium dioxide is not obvious.

For the organic modification of titanium dioxide, CN106221297A discloses a surface organic treatment method for improving titanium dioxide dispersibility, which improves the surface organic treatment effect of titanium dioxide by a pretreatment method, but the method firstly introduces citric acid on the surface of titanium dioxide, and then grafts an organic treatment agent required by the titanium dioxide process on the citric acid on the surface of titanium dioxide, thereby completing the organic treatment. The method introduces organic components and is difficult to process.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the existing titanium dioxide organic modification method has poor improvement effect on dispersibility and covering power.

The technical scheme for solving the technical problems comprises the following steps: provides a method for organically modifying titanium dioxide. The method comprises the following steps:

a. at the aging stage of inorganic coating of titanium dioxide, TiO-containing titanium dioxide is added₂Stabilizing the temperature of the inorganic coating slurry at 45-65 ℃, and stirring while keeping the temperature;

b. adjusting the pH value of the slurry to be within the range of 6.0-8.8, and stirring at a constant temperature;

c. adding an organic treating agent, and continuing to keep the temperature and stir;

d. filtering and washing the titanium dioxide slurry;

e. and drying and crushing the washed titanium dioxide filter cake to obtain the organic modified titanium dioxide.

In the method for organically modifying the titanium dioxide, the heat preservation temperature in the steps a, b and c is 45-65 ℃.

In the method for organically modifying titanium dioxide, the stirring time in the steps a and b is 10-60 min.

In the method for organically modifying titanium dioxide, the stirring time in the step c is 10-40 min.

In the method for organically modifying titanium dioxide, the organic treating agent in the step c is organic silicon or polyhydric alcohol.

Wherein, in the method for organically modifying titanium dioxide, the addition amount of the organic treating agent in the step c is TiO₂0.10 to 1.00% of the mass of (A).

In the method for organically modifying the titanium dioxide, the filtration in the step d adopts filter cloth with the number of warp and weft lines not less than 64/13 pieces/cm.

In the method for organically modifying the titanium dioxide, desalted water is used for washing in the step d, and the temperature of the desalted water is 45-65 ℃.

Wherein, in the method for organically modifying titanium dioxide, the desalted water amount in the step d is TiO₂15 to 25 times of the mass of (A).

In the method for organically modifying titanium dioxide, the drying in the step e is one of flash drying or spray drying.

The invention has the beneficial effects that:

the invention provides a titanium dioxide organic modification method, which can effectively improve the adsorption uniformity and stability of an organic treating agent on the surface of titanium dioxide particles by adjusting the temperature and pH of slurry to appropriate levels and then adding the organic treating agent after inorganic modification of titanium dioxide, thereby improving the dispersibility of titanium dioxide. The titanium dioxide modified by the method has excellent dispersibility (the dispersibility of the titanium dioxide can be improved by 0.25-0.75 HG), and has good application and popularization values.

Detailed Description

The invention provides a titanium dioxide organic modification method, which comprises the following steps:

a. at the aging stage of inorganic coating of titanium dioxide, TiO-containing titanium dioxide is added₂Stabilizing the temperature of the inorganic coating slurry at 45-65 ℃, and stirring while keeping the temperature;

b. adjusting the pH value of the slurry to be within the range of 6.0-8.8, and stirring at a constant temperature;

c. adding an organic treating agent, and continuing to keep the temperature and stir;

d. filtering and washing the titanium dioxide slurry;

e. and drying and crushing the titanium dioxide filter cake to obtain the organic modified titanium dioxide.

In the method for organically modifying titanium dioxide, the inorganic coating slurry in the step a is titanium dioxide slurry coated with silicon dioxide, aluminum oxide, zirconium oxide or phosphorus pentoxide. The composition and content of the slurry are not required here.

In the method for organically modifying the titanium dioxide, the heat preservation temperature in the steps a, b and c is 45-65 ℃.

In the method for organically modifying titanium dioxide, the stirring time in the steps a and b is 10-60 min.

In the method for organically modifying titanium dioxide, the stirring time in the step c is 10-40 min.

In the method for organically modifying titanium dioxide, the organic treating agent in the step c is organic silicon or polyhydric alcohol.

Wherein, in the method for organically modifying titanium dioxide, the addition amount of the organic treating agent in the step c is TiO₂0.10 to 1.00% of the mass of (A).

In the method for organically modifying the titanium dioxide, the filtration in the step d adopts filter cloth with the number of warp and weft lines not less than 64/13 pieces/cm.

In the method for organically modifying the titanium dioxide, desalted water is used for washing in the step d, and the temperature of the desalted water is 45-65 ℃.

Wherein, in the method for organically modifying titanium dioxide, the desalted water amount in the step d is TiO₂15 to 25 times of the mass of (A).

In the method for organically modifying titanium dioxide, the drying in the step e is one of flash drying or spray drying.

At present, the adding process of the organic treating agent in the industry is to directly add the liquid organic treating agent into the solid powder of the titanium dioxide after the titanium dioxide is dried, so that the adding uniformity and the adding effectiveness of the organic treating agent are poor. The invention changes the adding mode of the liquid organic treating agent, controls the corresponding temperature and pH value in the aging stage of the inorganic coating, adds the organic treating agent into the titanium dioxide slurry, and then filters, washes and dries the slurry. According to the treatment method disclosed by the invention, the temperature and the pH are controlled, and the effectiveness of the property of the organic treatment agent can be effectively ensured. Meanwhile, the surface of the titanium dioxide can be promoted to be effectively grafted with the organic treating agent, the organic modification effect is better, and the dispersibility of the titanium dioxide can be obviously improved.

The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.