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Production method of high-light-fastness rutile type titanium dioxide

A technology of rutile titanium dioxide and production methods, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of insufficient light resistance, little contribution, yellowish phase of titanium dioxide pink, etc., to achieve Effects of improving light resistance, improving dispersibility, and high hiding power

Active Publication Date: 2010-10-13
SICHUAN LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] U.S. Patent No. 4,461,810 discloses a method for improving the light resistance of titanium dioxide, adding a cerium salt in the post-treatment process of titanium dioxide, utilizing Ce 4+ / C 3+ The redox electromotive force is higher than that of Ti 4+ / Ti 3+ The redox electromotive force of the Ce 4+ Ti exists 4+ The principle that it will not be reduced ensures the light resistance of titanium dioxide, but the added cerium salt may make the hue of titanium dioxide turn yellow, and the product cost will also increase significantly
[0008] Chinese Patent Application No. 200710191023.5 mentions a method of improving the light resistance of titanium dioxide by coating with zirconium, aluminum and phosphorus, but the zirconium compound generated in this method is hydrated zirconia, which requires special light resistance for laminated paper, etc. High fields don't contribute much
However, the use of zirconium salt alone or aluminum salt alone or phosphate alone cannot greatly improve the light resistance of titanium dioxide in specific fields; and, if these raw material salts are simply added to the titanium dioxide slurry Among them, the resulting coating layer does not contribute much to the improvement of the light resistance of titanium dioxide; the order and amount of addition of each raw material salt significantly affect the light resistance of the product titanium dioxide; inappropriate addition order and amount , the ideal effect of improving light resistance cannot be achieved

Method used

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  • Production method of high-light-fastness rutile type titanium dioxide
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Embodiment 1

[0035] The preparation method of the high lightfastness titanium dioxide of the present embodiment comprises the following main steps:

[0036] (1) Prepare the slurry containing the primary product of titanium dioxide: weigh 6000g of deionized water, add 12g of SiO 2 Sodium silicate solution, add 6000g uncoated rutile titanium dioxide under stirring to make a concentration of about 800gTiO 2 / L of titanium dioxide slurry, and then sanded with a sand mill to make the titanium dioxide reach the original particle size;

[0037] (2) Use deionized water to dilute the concentration of the qualified titanium dioxide slurry to 300gTiO 2 / L, and then transferred to the coating tank, and the temperature of the slurry was raised to 50°C by indirect steam heating;

[0038] (3), add 150mL40gP 2 o 5 / L (after adding P 2 o 5 with TiO 2 The mass percentage is about 0.1%) of sodium hexametaphosphate solution; then the pH value of the slurry is adjusted to 8.0 with a mass percentage conc...

Embodiment 2

[0044] The preparation method of the high lightfastness titanium dioxide of the present embodiment comprises the following main steps:

[0045] (1) Prepare the slurry containing the primary product of titanium dioxide: weigh 6000g of deionized water, add 12g of SiO 2 Sodium silicate solution, add 6000g uncoated rutile titanium dioxide under stirring to make a concentration of about 800gTiO 2 / L of titanium dioxide slurry, and then sanded with a sand mill to make the titanium dioxide reach the original particle size;

[0046] (2) Use deionized water to dilute the concentration of the qualified titanium dioxide slurry to 200gTiO 2 / L, and then transferred to the coating tank, and the temperature of the slurry was raised to 40°C by indirect steam heating;

[0047] (3), add 1200mL40gP 2 o 5 / L (after adding P 2 o 5 with TiO 2 The mass percent is about 0.8%) of sodium hexametaphosphate solution; then the pH value of the slurry is adjusted to 7.0 with a mass percent concentra...

Embodiment 3

[0053] The preparation method of the high lightfastness titanium dioxide of the present embodiment comprises the following main steps:

[0054] (1) Prepare the slurry containing the primary product of titanium dioxide: weigh 6000g of deionized water, add 12g of SiO 2 Sodium silicate solution, add 6000g uncoated rutile titanium dioxide under stirring to make a concentration of about 800gTiO 2 / L of titanium dioxide slurry, and then sanded with a sand mill to make the titanium dioxide reach the original particle size;

[0055] (2) Use deionized water to dilute the concentration of the qualified titanium dioxide slurry to 400gTiO 2 / L, and then transferred to the coating tank, and the temperature of the slurry was raised to 70°C by indirect steam heating;

[0056] (3), add 3000mL30gP 2 o 5 / L (after adding P 2 o 5 with TiO 2The mass percent is about 1.5%) phosphoric acid solution; then the pH value of the slurry is adjusted to 7.5 with a mass percent concentration of 15% d...

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Abstract

The invention discloses a production method of high-light-fastness rutile type titanium dioxide, which comprises the following steps such as preparing slurry containing rough titanium dioxide, diluting the slurry, adding phosphorus compounds, adding zirconium compounds, adding phosphorus compounds, adding alkaline aluminum compounds, curing, filtering, washing, drying, and crushing. By controlling the adding order and the additive amount of saline components of each material, the added coating agent can precipitate onto the surface of titanium dioxide particles respectively in forms of zirconium phosphate, aluminum phosphate and hydrated aluminum oxide, then through the process like curing, filtering, washing, drying and steam flow crushing, light fastness of the titanium pigment product can be increased, and the characteristics such as high brightness and high opacity can be maintained. Moreover, the dispersibility of the titanium pigment product in an aquosity system is improved, thereby facilitating slurry preparation, slurry storage and the like in use of titanium dioxide.

Description

technical field [0001] The invention relates to the technical field of production of titanium dioxide, in particular to a production method of high light resistance rutile titanium dioxide. Background technique [0002] Titanium dioxide pigment is the best white pigment. It has the advantages of high whiteness, high opacity, stable physical and chemical properties, etc. It is widely used in coatings, plastics, papermaking and other industries. However, due to the photochemical activity of the titanium dioxide pigment itself, it is easy to change color under the irradiation of ultraviolet rays in the sun, making the color of the product gray. This is because the electrons excited by ultraviolet rays make the tetravalent titanium be reduced to trivalent titanium. In order to overcome the photochemical activity of titanium dioxide, a lot of research work has been carried out abroad. The manufacturers of titanium dioxide have adopted many technologies, including adding aluminum ...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
Inventor 刘不尽刘洪金高华朱全芳邓伯松
Owner SICHUAN LOMON TITANIUM IND CO LTD
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