Special preparation method for improving weather fastness of titanium dioxide

A titanium dioxide, weather resistance technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of difficult to achieve weather resistance, incomplete coating, weather resistance discount, etc., to improve gloss and Dispersibility, reduce photocatalytic effect, improve weather resistance effect

Active Publication Date: 2019-07-19
HENAN BILLIONS NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silicon oxide film is affected by many factors during the coating process. The coating of titanium dioxide particles is incomplete and exposed, which greatly reduces the weather resistance. A high coating amount can avoid this shortcoming, but it sacrifices the formula while improving the weather resistance. Applicability, so that its application is limited; due to the high cost of zirconium raw materials, zirconia generally has less coating, and it is difficult to achieve better weather resistance

Method used

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  • Special preparation method for improving weather fastness of titanium dioxide
  • Special preparation method for improving weather fastness of titanium dioxide
  • Special preparation method for improving weather fastness of titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] After the uncoated titanium dioxide is pulverized, wet-milled, sand-milled, and diluted, the slurry concentration is 300g / L, the pH of the slurry is 8.0, the stirring is started, and the temperature is raised to 90°C; 0.1wt% Na is added within 15 minutes 2 SiO 3 solution (as SiO 2 meter), homogenize for 15 minutes; use dilute H 2 SO 4 Adjust the pH value of the slurry to 2.5, homogenize for 20 minutes; add 1wt% FeSO within 60 minutes at the same time 4 Solution and dilute NaOH solution, maintain the pH value of the slurry at 2.5, and homogenize for 30 minutes; adjust the pH value of the slurry with dilute NaOH to 10.2-10.4 within 15 minutes, and homogenize for 20 minutes; add 3.5wt% Na within 20 minutes 2 SiO 3 solution (as SiO 2 total), homogenize for 20min; within 150min-180min, use dilute H 2 SO 4 Adjust the pH of the slurry to 6.5-7.5, homogenize for 30 minutes; use dilute NaOH to adjust the pH of the slurry to 8.0 within 30 minutes, and homogenize for 30 min...

Embodiment 2

[0036] After the uncoated titanium dioxide is pulverized, wet-milled, sand-milled and diluted, the slurry concentration is 250g / L, the pH value of the slurry is 8.0, the stirring is started, and the temperature is raised to 85°C; 0.2wt% Na is added within 15min 2 SiO 3 solution (as SiO 2 meter), homogenize for 15 minutes; use dilute H 2 SO 4 Adjust the pH value of the slurry to 3, homogenize for 20 minutes; add 1.5wt% FeSO within 60 minutes at the same time 4 Solution and dilute NaOH solution, maintain the pH value of the slurry at 3, homogenize for 30 minutes; use dilute NaOH to adjust the pH value of the slurry to 10.2-10.4 within 15 minutes, and homogenize for 20 minutes; add 2.5wt% Na within 20 minutes 2 SiO 3 solution (as SiO 2 total), homogenize for 20min; within 180min-200min, dilute H 2 SO 4 Adjust the pH of the slurry to 6.5-7.5, homogenize for 30 minutes; adjust the pH of the slurry to 8.0 with dilute NaOH within 30 minutes, and homogenize for 30 minutes; add ...

Embodiment 3

[0038] After the uncoated titanium dioxide is pulverized, wet-milled, sand-milled, and diluted, the slurry concentration is 300g / L, the pH value of the slurry is 8.0, the stirring is started, and the temperature is raised to 90°C; 0.25wt% Na is added within 15 minutes 2 SiO 3 solution (as SiO 2 meter), homogenize for 15 minutes; use dilute H 2 SO 4 Adjust the pH value of the slurry to 3.5, homogenize for 20 minutes; add 2.5wt% FeSO within 60 minutes at the same time 4 Solution and dilute NaOH solution, maintain the pH value of the slurry at 3.5, and homogenize for 30 minutes; adjust the pH value of the slurry with dilute NaOH to 10.2-10.4 within 15 minutes, and homogenize for 20 minutes; add 3wt% Na within 20 minutes 2 SiO 3 solution (as SiO 2 total), homogenize for 20min; within 200min-240min, dilute H 2 SO 4 Adjust the pH of the slurry to 6.5-7.5, homogenize for 30 minutes; use dilute NaOH to adjust the pH of the slurry to 8.0 within 30 minutes, and homogenize for 30 ...

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Abstract

The invention belongs to the technical field of preparation of titanium dioxide, and discloses a special preparation method for improving the weather fastness of titanium dioxide. The special preparation method comprises the following steps: 1) preparing a titanium dioxide slurry, adding a silicate solution, and coating a first layer of silicon film; 2) adjusting the pH value of the slurry coatedwith the silicon film to 2-4, homogenizing, adding a FeSO4 solution and a dilute alkali solution at the same time, maintaining the pH value of the slurry to 2-4, and then homogenizing; 3) then addingthe silicate solution, coating a second layer of silicon film; 4) adding an aluminum salt solution and the dilute a dilute acid solution or the alkali solution, coating an aluminum film; 5) washing with water the slurry coated with the aluminum film, flashing, and pulverizing with vapor to obtain a finished product of titanium dioxide. The prepared titanium dioxide is relatively high in weather fastness, and the dispersity and the formula applicability are comparatively excellent.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide preparation, and in particular relates to a special preparation method for improving the weather resistance of titanium dioxide. Background technique [0002] As an important inorganic chemical raw material, titanium dioxide has stable chemical properties and is an important white pigment with high hiding power. It is mainly used in plastics, coatings, papermaking, and inks. Titanium dioxide has high heat resistance and weather resistance, and is widely used in coatings, cosmetics, plastics, ceramics and other fields. Especially in the paint industry, it is widely used, accounting for 80% of the total white pigment usage. [0003] In various industrial applications of titanium dioxide, weather resistance is extremely important. Weather resistance refers to the ability of an organic medium (such as a coating film) containing titanium dioxide pigments to withstand a series of aging phenom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC01P2006/22C01P2006/60C09C1/3661
Inventor 陈建立王欢欢王永珊曹青喜李瑞瑞王莉萍冯亚阳赵丁张健
Owner HENAN BILLIONS NEW MATERIAL CO LTD
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