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An inorganic coating process for preparing high weather resistance titanium dioxide

A technology of inorganic coating and titanium dioxide, which is applied in the direction of inorganic pigment treatment, fibrous fillers, chemical instruments and methods, etc., can solve the problems of reducing the weather resistance of titanium dioxide and achieve the effect of improving weather resistance

Active Publication Date: 2021-11-05
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lattice defects of titanium dioxide itself make titanium dioxide photocatalytically active, thereby reducing the weather resistance of titanium dioxide

Method used

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  • An inorganic coating process for preparing high weather resistance titanium dioxide
  • An inorganic coating process for preparing high weather resistance titanium dioxide
  • An inorganic coating process for preparing high weather resistance titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 3 liters of TiO 2 Sanded TiO with a concentration of 300g / L 2 Add 4.05 g of solid sodium carbonate to the slurry, adjust the pH of the slurry to 9.0, and heat the slurry to 60°C. In 1 hour, 315mL concentration was 100g / L (as SiO 2 Sodium silicate solution and dilute sulfuric acid solution flow into the slurry to keep the pH value and temperature stable during the coating process, and then homogenize for 30 minutes. Adjust the pH of the slurry to 6.0, heat the slurry to 90° C., and mature for 1 hour. After the slurry cools down to 80°C, adjust the pH value of the slurry to 8.0, and within 1 hour, make 270mL 2 o 3 Add the sodium metaaluminate solution and the dilute sulfuric acid solution into the slurry, and keep the temperature and pH value stable during the coating process, and then homogenize for 30 minutes. Adjust the pH value of the slurry to 6.0, filter and wash after aging for 1 hour, and dry the filter cake to obtain titanium dioxide sample 1.

Embodiment 2

[0033] The inorganic coating process of this implementation is the same as that of Example 1, except that sodium bicarbonate is used instead of sodium carbonate as the coating aid. A titanium dioxide sample 1A was obtained.

Embodiment 3

[0035] The inorganic coating process of this implementation is the same as that of Example 1, except that sodium citrate is used instead of sodium carbonate as the coating aid. A titanium dioxide sample 1B was obtained.

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Abstract

The invention belongs to the technical field of titanium dioxide production, and discloses an inorganic coating process for preparing high-weather-resistant titanium dioxide. The inorganic coating process includes the following steps: 1) preparing titanium dioxide slurry; 2) adding titanium dioxide slurry to the titanium dioxide slurry Water-soluble weak acid salt coating aid, adjust the temperature and pH value of the slurry, perform silicon coating, adjust the temperature and pH value of the slurry after silicon coating, and stir and mature; 3) Adjust the temperature and pH of the slurry Value, carry out aluminum coating, adjust the pH value of the slurry after the aluminum coating is completed, stir and mature; 4) The slurry is filtered, washed, and dried to obtain titanium dioxide products. The titanium dioxide sample prepared by the inorganic coating process is uniformly coated with silicon and aluminum, has low acid solubility, high gloss retention rate and good weather resistance.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide production, and in particular relates to an inorganic coating process for preparing high-weather-resistant titanium dioxide. Background technique [0002] Titanium dioxide is based on titanium dioxide (TiO 2 ) as the main component of inorganic chemical pigments, titanium dioxide (TiO 2 ) has stable physical and chemical properties, high opacity, high whiteness and high brightness. It is the white pigment with the best performance, accounting for 80% of the total white pigment usage, and is widely used in coatings, plastics, inks, papermaking, chemical fiber and other industries. [0003] In various application fields of titanium dioxide, weather resistance is an important application index. Weather resistance refers to the nature of a series of aging phenomena such as fading, chalking, and yellowing of organic media (such as coating films, plastics) containing titanium dioxide under u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3661C09C1/3692C09C3/006C09C3/063
Inventor 吴彭森张强张玉荣代堂军刘不尽杜国华
Owner CENT SOUTH UNIV