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Preparation method for titanium dioxide pigment

A titanium dioxide and pigment technology, which is applied in the field of preparing titanium dioxide pigments for laminated paper with high light resistance, can solve the problems of yellowing of titanium dioxide pink and increase production costs, and achieves improvement of light resistance and weather resistance, changes in surface charge characteristics, The effect of improving water dispersion stability

Active Publication Date: 2015-07-15
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cerium salt may make the hue of titanium dioxide turn yellow, and it will also greatly increase the production cost

Method used

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  • Preparation method for titanium dioxide pigment
  • Preparation method for titanium dioxide pigment
  • Preparation method for titanium dioxide pigment

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preparation example Construction

[0022] The preparation method of the titanium dioxide pigment according to the exemplary embodiment of the present invention comprises the following steps:

[0023] (1) After the titanium dioxide powder is beaten to obtain a titanium dioxide slurry with a concentration of 250-350g / L, disperse it with a phosphate-containing compound, and adjust the pH value of the slurry to 9.0-11.0 with deionized water and dilute alkali solution. Wherein, the titanium dioxide powder comes from the sulfuric acid titanium dioxide production process, and the rutile conversion rate of the titanium dioxide powder is above 98%.

[0024] (2) Heat the slurry to 80-100°C, add sodium silicate solution, the amount of sodium silicate solution is based on SiO 2 Calculated as TiO in the slurry 2 1.0-5.0% of the mass, keep the system temperature unchanged after adding the sodium silicate solution. Wherein, if the temperature is too low or too high, no dense silicon coating can be obtained.

[0025] (3) Ad...

example 1

[0041] (1) After the titanium dioxide powder is beaten to obtain a titanium dioxide slurry with a concentration of 250g / L, it is dispersed with sodium hexametaphosphate, and the pH value of the slurry is adjusted to 9.0 with a dilute alkali solution. Among them, the rutile conversion of the titanium dioxide powder 98.5%

[0042] (2) Heat the slurry to 80°C, add sodium silicate solution, the amount of sodium silicate solution is based on SiO 2 Calculated as TiO in the slurry 2 1.5% of the mass, keep the temperature of the system constant after adding the sodium silicate solution.

[0043] (3) Add dilute acid to adjust the pH value of the slurry to 3.0, and mature for 60 minutes.

[0044] (4) Add dilute alkali solution to adjust the pH value of the slurry to 7.0.

[0045] (5) Add phosphoric acid solution, and add sodium metaaluminate solution to maintain the pH value of the slurry at 8.0. Among them, the addition amount of phosphoric acid solution is P 2 o 5 Calculated as ...

example 2

[0051] (1) After the titanium dioxide powder is beaten, a titanium dioxide slurry with a concentration of 350g / L is obtained, which is dispersed with sodium hexametaphosphate, and the pH value of the slurry is adjusted to 11.0 with a dilute alkali solution. Wherein, the rutile conversion rate of the powder is 99.0%.

[0052] (2) Heat the slurry to 100°C, add sodium silicate solution, the amount of sodium silicate solution is based on SiO 2 Calculated as TiO in the slurry 2 3.0% of the mass, keep the system temperature constant after adding the sodium silicate solution.

[0053] (3) Add dilute acid to adjust the pH value of the slurry to 5.0, and ripen for 30 minutes.

[0054] (4) Add dilute alkali solution to adjust the pH value of the slurry to 9.0.

[0055] (5) Add phosphoric acid solution, and then add potassium metaaluminate solution to maintain the pH value of the slurry at 9.0. Among them, the addition amount of phosphoric acid solution is P 2 o 5 Calculated as TiO...

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Abstract

The invention provides a preparation method for a titanium dioxide pigment. The method comprises the following steps: a titanium dioxide powder material is subjected to pulping and dispersion processing, a titanium dioxide pulp material is obtained, the pH value of the pulp material is adjusted to 9.0-11.0, the pulp material is heated to 80-100 DEG C, a sodium silicate solution is added with an addition amount of being 1.0-5.0% of TiO2 mass in the pulp material in terms of SiO2, the temperature of the system is kept unchangeable, the pH value of the pulp material is adjusted to 3.0-5.0, slaking is carried out, the pH value of the pulp material is adjusted to 6.0-9.0, a solution containing phosphate radical compounds with an addition amount of being 1.0-4.0% of TiO2 mass in the pulp material in terms of P2O5 is added, at the same time, a solution containing aluminum compounds is added to keep the pH value of the pulp material being 5.0-9.0, the addition amount of the added solution containing aluminum compounds is 2.0-4.0% of TiO2 mass in the pulp material in terms of Al2O3, at the same time, acid or alkali is added to keep the pH value of the pulp material being 5.0-9.0, a titanium dioxide pigment is obtained after slaking, filtering, washing, drying, addition of organic treating agents and crushing. The product with good light resistance and covering power is obtained through special inorganic and organic surface treatments.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing titanium dioxide pigments for laminated paper with high light resistance. Background technique [0002] Titanium dioxide can improve the opacity and gloss retention of decorative paper. It is an important raw material for decorative paper, and its usage accounts for about 30-40% of the output of decorative paper. [0003] Decorative paper (or laminated paper) refers to paper made of titanium dioxide and fibers, impregnated with thermosetting resins such as melamine formaldehyde resin, and then heat-pressed with fiberboard, moisture-proof paper, and wear-resistant surface paper. Due to the special thermosetting resin and high-strength hot pressing process, the laminate has very high stability against scratches, impacts, and chemicals. But it is precisely because of this dense structure that the titanium dioxide inside the laminate is isolated from the outsi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06D21H17/69
Inventor 景建林袁立军廖荣华淦文军柯良辉袁秀香肖勇丽
Owner CHONGQING TITANIUM IND OF PANGANG GROUP
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