Preparation method of high-weather-resistance and high-dispersion plastic color master batch titanium dioxide pigment

Abstract

The invention relates to a preparation method of a high-weather-resistance and high-dispersion plastic color master batch titanium dioxide pigment, and the method comprises the following steps: producing a titanium dioxide primary product by a chlorination process, pulping in desalted water to prepare a slurry, regulating the pH value with an inorganic acid or alkali, dispersing, and grinding; heating the slurry, adding an alkaline aluminate compound, and simultaneously maintaining the pH value constant by using inorganic acid or an acidic aluminum compound to form an inorganic aluminum film coating layer on the surface of titanium dioxide particles; adjusting the pH value by adopting an inorganic alkali solution, and adding a polysiloxane liquid containing an active group to form an organic silicon film coating layer; filtering with deionized water, washing, and drying; adding a citrate ester organic treating agent in the steam-pulverizing process, and performing steam-pulverizing treatment to obtain a titanium dioxide finished product. The advantages are that: the titanium dioxide pigment prepared by the method has high weather resistance, high whiteness, high covering power andexcellent dispersion processability, has low dust flying in the production and use processes, is environment-friendly, and is suitable for the application fields of high-end color master batches suchas polyolefin, engineering plastics and the like

Description

Technical field

[0001] The invention relates to a method for preparing a titanium dioxide pigment with high weather resistance and high dispersion plastic color masterbatch in the chemical industry. Background technique

[0002] The full name of color masterbatch is color masterbatch, which is a new type of special colorant for polymer materials, also known as pigment preparation. Color masterbatches are mainly used in plastics. The color masterbatch is mainly composed of three basic elements: pigment, carrier and additive. It is an aggregate made by uniformly loading an ultra-constant amount of pigment in the resin. It can be called a pigment concentrate. The coloring power is higher than that of the pigment itself. When mixing with a small amount of color masterbatch and uncolored resin, the colored resin or product with the designed pigment concentration can be achieved. It has the characteristics of convenient processing, uniform products, and easy color matching. Color ma...

Examples

Embodiment 1

[0031] 1.1. Using the chloride method rutile titanium dioxide preliminary product, add a certain amount of deionized water to prepare a titanium dioxide slurry with a concentration of 300g / L, the rutile content of the titanium dioxide preliminary product is 99.5%, the D50 particle size is 0.20μm; Adjust the pH of the titanium dioxide slurry to 4.5 for 30% sodium hydroxide solution, add 0.1% sodium silicate solution (the amount of sodium silicate solution added is SiO 2 TiO 2 Weight), sodium silicate solution is SiO 2 150g / L, aging for 10min;

[0032] 1.2. Grind the dispersed titanium dioxide slurry, the D50 particle size is 280nm, and the particle size exceeding 500nm is less than 5.0%, and the grinding medium is removed from the water slurry;

[0033] 1.3. Heat the polished slurry to 40°C and maintain this temperature throughout the coating process;

[0034] 1.4. Add 0.5% NaAlO within 30min 2 Solution (addition is calculated based on the weight of aluminum oxide in the weight of tit...

Embodiment 2

[0040] 1.1. Using the chloride method rutile titanium dioxide preliminary product, adding a certain amount of deionized water to prepare a titanium dioxide slurry with a concentration of 500g / L, the rutile content of the titanium dioxide preliminary product is 99.7%, and the D50 particle size is 0.28μm; Adjust the pH of the titanium dioxide slurry to 5.5 for 10% sodium hydroxide solution, and add 0.5% sodium silicate solution (the amount of sodium silicate solution added is SiO 2 TiO 2 Weight), sodium silicate solution is SiO 2 Calculated as 150g / L, aging for 30min;

[0041] 1.2. Grind the dispersed titanium dioxide slurry, the D50 particle size is 287nm, and the particle size exceeding 500nm is less than 5.3%, and the grinding medium is removed from the water slurry;

[0042] 1.3. Heat the grinded slurry to 80°C, and maintain this temperature throughout the coating process;

[0043] 1.4. Add 3.0% NaAlO within 30min 2 Solution (addition is calculated based on the weight of aluminum o...

Embodiment 3

[0049] 1.1. Using the chloride method rutile titanium dioxide preliminary product, adding a certain amount of deionized water to prepare a titanium dioxide slurry with a concentration of 400g / L, the rutile content of the titanium dioxide preliminary product is 99.9%, and the D50 particle size is 0.25μm; Adjust the pH of the titanium dioxide slurry to 5.0 for 20% sodium hydroxide solution, add 0.3% sodium silicate solution (the amount of sodium silicate solution added is SiO 2 TiO 2 Weight), sodium silicate solution is SiO 2 Calculated as 150g / L, aging for 20min;

[0050] 1.2. Grind the dispersed titanium dioxide slurry, the D50 particle size is 285nm, and the particle size exceeding 500nm is less than 5.5%, and the grinding medium is removed from the water slurry;

[0051] 1.3. Heat the grinded slurry to 60°C and maintain this temperature throughout the coating process;

[0052] 1.4. Add 2.0% NaAlO within 120min 2 Solution (addition is calculated based on the weight of aluminum oxide...

Technical field

[0001] The invention relates to a method for preparing a titanium dioxide pigment with high weather resistance and high dispersion plastic color masterbatch in the chemical industry. Background technique

[0002] The full name of color masterbatch is color masterbatch, which is a new type of special colorant for polymer materials, also known as pigment preparation. Color masterbatches are mainly used in plastics. The color masterbatch is mainly composed of three basic elements: pigment, carrier and additive. It is an aggregate made by uniformly loading an ultra-constant amount of pigment in the resin. It can be called a pigment concentrate. The coloring power is higher than that of the pigment itself. When mixing with a small amount of color masterbatch and uncolored resin, the colored resin or product with the designed pigment concentration can be achieved. It has the characteristics of convenient processing, uniform products, and easy color matching. Color ma...

Examples

Embodiment 1

[0031] 1.1. Using the chloride method rutile titanium dioxide preliminary product, add a certain amount of deionized water to prepare a titanium dioxide slurry with a concentration of 300g / L, the rutile content of the titanium dioxide preliminary product is 99.5%, the D50 particle size is 0.20μm; Adjust the pH of the titanium dioxide slurry to 4.5 for 30% sodium hydroxide solution, add 0.1% sodium silicate solution (the amount of sodium silicate solution added is SiO 2 TiO 2 Weight), sodium silicate solution is SiO 2 150g / L, aging for 10min;

[0032] 1.2. Grind the dispersed titanium dioxide slurry, the D50 particle size is 280nm, and the particle size exceeding 500nm is less than 5.0%, and the grinding medium is removed from the water slurry;

[0033] 1.3. Heat the polished slurry to 40°C and maintain this temperature throughout the coating process;

[0034] 1.4. Add 0.5% NaAlO within 30min 2 Solution (addition is calculated based on the weight of aluminum oxide in the weight of tit...

Embodiment 2

[0040] 1.1. Using the chloride method rutile titanium dioxide preliminary product, adding a certain amount of deionized water to prepare a titanium dioxide slurry with a concentration of 500g / L, the rutile content of the titanium dioxide preliminary product is 99.7%, and the D50 particle size is 0.28μm; Adjust the pH of the titanium dioxide slurry to 5.5 for 10% sodium hydroxide solution, and add 0.5% sodium silicate solution (the amount of sodium silicate solution added is SiO 2 TiO 2 Weight), sodium silicate solution is SiO 2 Calculated as 150g / L, aging for 30min;

[0041] 1.2. Grind the dispersed titanium dioxide slurry, the D50 particle size is 287nm, and the particle size exceeding 500nm is less than 5.3%, and the grinding medium is removed from the water slurry;

[0042] 1.3. Heat the grinded slurry to 80°C, and maintain this temperature throughout the coating process;

[0043] 1.4. Add 3.0% NaAlO within 30min 2 Solution (addition is calculated based on the weight of aluminum o...

Embodiment 3

[0049] 1.1. Using the chloride method rutile titanium dioxide preliminary product, adding a certain amount of deionized water to prepare a titanium dioxide slurry with a concentration of 400g / L, the rutile content of the titanium dioxide preliminary product is 99.9%, and the D50 particle size is 0.25μm; Adjust the pH of the titanium dioxide slurry to 5.0 for 20% sodium hydroxide solution, add 0.3% sodium silicate solution (the amount of sodium silicate solution added is SiO 2 TiO 2 Weight), sodium silicate solution is SiO 2 Calculated as 150g / L, aging for 20min;

[0050] 1.2. Grind the dispersed titanium dioxide slurry, the D50 particle size is 285nm, and the particle size exceeding 500nm is less than 5.5%, and the grinding medium is removed from the water slurry;

[0051] 1.3. Heat the grinded slurry to 60°C and maintain this temperature throughout the coating process;

[0052] 1.4. Add 2.0% NaAlO within 120min 2 Solution (addition is calculated based on the weight of aluminum oxide...

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