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Preparation method of high-gloss rutile titanium dioxide

A rutile type titanium dioxide, high gloss technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment and other directions, can solve the problems of particle slurry instability, precipitation, deterioration of dispersion performance, etc. The effect of improving dispersibility

Active Publication Date: 2014-10-29
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zirconium coating step in the coating process uses zirconium sulfate that is metered at one time. Since the zirconium sulfate solution is strongly acidic, the pH of the coating slurry will gradually drop from an alkaline environment of 8-11 to 1-2. In an acidic environment, since an isoelectric point of rutile titanium dioxide is between pH 5 and 7 (the so-called isoelectric point means that the particle surface potential is 0mv, the dispersion between particles cannot be achieved by electrostatic repulsion at this time, so the particle material The slurry will be destabilized, flocculated, precipitated and a series of consequences that deteriorate the dispersion performance), so with the addition of zirconium sulfate, the titanium dioxide particles will agglomerate in the process of decreasing the acidity of the system and gradually jumping over the isoelectric point, and the subsequent zirconium 1. The aluminum coating process only occurs on the aggregates of titanium dioxide. As the final aggregates are depolymerized by jet milling and depolymerization, a large number of titanium dioxide particles that have not been treated with aluminum coating will seriously affect the dispersion performance and weather resistance of titanium dioxide. performance

Method used

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  • Preparation method of high-gloss rutile titanium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The qualified TiO will be pulverized through the sand milling process 2 Heat the slurry to about 45-55°C, add a dispersant, adjust the pH=10.0-10.5, and add metered zirconium sulfate at one time within 60 minutes, and the added amount is expressed as ZrO 2 / TiO 2 =0.8%, then use sodium hydroxide to slowly adjust the pH of the system between 10.0-10.5, mature for 30 minutes, cool the material to 40°C, sand mill for 5 minutes, then raise the temperature to 45°C, and add sodium metaaluminate and sulfuric acid solution, the amount of sodium metaaluminate added is Al 2 o 3 / TiO 2 =3.5%, adjust the pH of the system between 10.0-10.5, mature for 30min, adjust the slurry to neutral, wash with water, organically treat and jet mill to obtain rutile titanium dioxide sample A, and test the 20° gloss and weather resistance of the product.

Embodiment 2

[0019] The qualified TiO will be pulverized through the sand milling process 2 Heat the slurry to about 45-55°C, add a dispersant, adjust the pH=10.0-10.5, and add metered zirconium sulfate at one time within 60 minutes, and the added amount is expressed as ZrO 2 / TiO 2 =0.8%, then use sodium hydroxide to slowly adjust the pH of the system between 10.0-10.5, mature for 30 minutes, cool the material to 35°C, sand mill for 20 minutes, then raise the temperature to 50°C, and add sodium metaaluminate and sulfuric acid in parallel solution, the amount of sodium metaaluminate added is Al 2 o 3 / TiO 2 =3.5%, adjust the pH of the system between 10.0-10.5, mature for 30min, adjust the slurry to neutral, wash with water, organically treat and jet mill to obtain rutile titanium dioxide sample B, and test the 20° gloss and weather resistance of the product.

Embodiment 3

[0021] The qualified TiO will be pulverized through the sand milling process 2 Heat the slurry to about 45-55°C, add a dispersant, adjust the pH=10.0-10.5, and add metered zirconium sulfate at one time within 60 minutes, and the added amount is expressed as ZrO 2 / TiO 2 =0.8%, then use sodium hydroxide to slowly adjust the pH of the system between 10.0-10.5, mature for 30 minutes, cool the material to 30°C, sand mill for 30 minutes, then raise the temperature to 55°C, and add sodium metaaluminate and sulfuric acid in parallel solution, the amount of sodium metaaluminate added is Al 2 o 3 / TiO 2 =3.5%, adjust the pH of the system between 10.0-10.5, mature for 30min, adjust the slurry to neutral, wash with water, organically treat and jet mill to obtain rutile titanium dioxide sample C, and test the 20° gloss and weather resistance of the product.

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Abstract

The invention discloses a preparation method of high-gloss rutile titanium dioxide. The preparation method comprises the following steps: grinding titanium dioxide slurry obtained by adopting a sulfuric acid process or a chlorination process through a sanding process, and performing heating, zirconium coating, aluminum coating, subsequent water washing, organic treatment and jet milling in sequence to obtain finished high-gloss rutile titanium dioxide, wherein the slurry is cooled in an indirect heat exchange way, ground for more than 5 minutes, heated to 45-55 DEG C and subjected to the aluminum coating after the zirconium coating. According to the method, titanium dioxide aggregates formed due to the pH change are depolymerized, so that the dispersity of titanium dioxide particles can be improved, the subsequent aluminum coating can be carried out in a state that the titanium dioxide particles are fully dispersed, the titanium dioxide particles are fully subjected to the aluminum coating, the dispersity of titanium dioxide is improved, the glossiness of titanium dioxide is also improved, and the high-gloss rutile titanium dioxide is obtained.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, in particular to a production method of high-gloss rutile titanium dioxide. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is considered to be a white pigment with the best performance in the world. It is widely used in coatings, plastics, papermaking, printing ink, chemical fiber, rubber, cosmetics and other industries. There are three crystal forms of titanium dioxide in nature: brookite, anatase and rutile. The plate titanium type is an unstable crystal type, which has no industrial application value. Both the anatase type and the rutile type have a stable crystal lattice, and are important white pigments and porcelain glazes. Compared with other white pigments, they have superior whiteness and coloring Strength, hiding power, weather resistance, heat resistance, and chemical stability, especially non-toxic. [0003] The industrial pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06
Inventor 代堂军曾小林钟小英
Owner SICHUAN LOMON TITANIUM IND CO LTD
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