Surface treatment technology of special titanium dioxide for papermaking

A technology of surface treatment and titanium dioxide, which is applied in papermaking, textile and papermaking, inorganic pigment treatment, etc., can solve the problems affecting the performance and service life of decorative paper, and achieve the effect of increasing the amount of titanium dioxide, large output and saving space

Inactive Publication Date: 2020-01-10
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some photoactivation points on the surface of titanium dioxide powder particles, so that the titanium dioxide pigment has a photocatalytic effect. Under the irradiation of sunlight, especially ultraviolet rays, a photocatalytic reaction occurs, and the organic components in contact with titanium dioxide are degraded and pulverized, which seriously affects the decorative paper. Various performance and service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Use a dispersant that is compatible with sodium silicate and sodium hydroxide (sodium hydroxide: sodium silicate = 1:10), according to the proportion of TiO 2 Add 0.2% of the total mass of the dispersant to the titanium dioxide solution, and pass through a 325-mesh sieve to obtain a ready-to-use slurry.

[0039] 2) The concentration of the titanium dioxide slurry is 300g / L, the temperature is raised to 45°C, and the initial pH value is 9.6.

[0040] 3) Add cerium sulfate solution within 30min, the amount of cerium sulfate added is based on CeO 2 Calculated as TiO in the slurry 2 0.2% of the mass, and at the same time add a mixture of sodium phosphate and sodium dihydrogen phosphate (sodium phosphate: sodium dihydrogen phosphate = 1:15), maintain the pH value between 3.5-4.0, and ripen for 45 minutes.

[0041] 4) Heat up to 65°C, add sodium silicate solution within 30 minutes, the amount of sodium silicate added is based on SiO 2 Calculated as TiO in the slurry 2 2....

Embodiment 2

[0046] 1) Use a dispersant that is compatible with sodium silicate and sodium hydroxide (sodium hydroxide: sodium silicate = 1:13), according to the proportion of TiO 2 0.15% of the total amount is added to the solution of titanium dioxide by adding a dispersant, and passing through a 500-mesh sieve to obtain a ready-to-use slurry.

[0047] 2) The concentration of the titanium dioxide slurry is 320g / L, the temperature is raised to 45°C, and the initial pH value is 9.8.

[0048] 3) Add cerium sulfate solution within 30min, the amount of cerium sulfate added is based on CeO 2 Calculated as TiO in the slurry 2 0.3% of the mass, while adding a mixture of sodium phosphate and phosphoric acid (sodium phosphate: phosphoric acid = 1:1), maintaining the pH value between 4.0-4.5, and aging for 60 minutes.

[0049] 4) Raise the temperature to 60°C, add sodium silicate solution within 45 minutes, the amount of sodium silicate added is based on SiO 2 Calculated as TiO in the slurry 2 3...

Embodiment 3

[0054] 1) Use a dispersant that is compatible with sodium silicate and sodium hydroxide (sodium hydroxide: sodium silicate = 1:20), according to the proportion of TiO 2 Add 0.2% of the total amount of dispersant to the solution of titanium dioxide, and pass through a 500-mesh sieve to obtain a ready-to-use slurry.

[0055] 2) The concentration of the titanium dioxide slurry is 270g / L, the temperature is raised to 50°C, and the initial pH value is 10.1.

[0056] 3) Add cerium sulfate solution within 45min, the amount of cerium sulfate added is based on CeO 2 Calculated as TiO in the slurry 2 0.4% of the mass, and at the same time add a mixture of sodium phosphate and sodium dihydrogen phosphate (sodium phosphate: sodium dihydrogen phosphate = 1:10), maintain the pH value between 4.2-4.7, and ripen for 60 minutes.

[0057] 4) Raise the temperature to 70°C, add sodium silicate solution within 45 minutes, the amount of sodium silicate added is based on SiO 2 Calculated as TiO i...

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Abstract

The invention belongs to the technical field of titanium dioxide production, and particularly relates to a surface treatment technology of special titanium dioxide for papermaking. The technology comprises the following steps: adding a dispersant into a sanded titanium dioxide slurry, performing stirring for dispersing, sieving to obtain a slurry with the TiO2 content of 200-400 g/L, coating the surfaces of titanium dioxide particles with cerium phosphate, silicon dioxide and phosphorus pentoxide, finally coating the surfaces of the titanium dioxide particles with aluminum oxide by parallel flow of alkaline aluminum and acidic aluminum, carrying out solid-liquid separation, and processing the obtained solid to obtain the finished product. The cerium salt and silicate are used for coating the titanium dioxide particles at the same time, so that the sun-proof property of titanium dioxide in a papermaking system is greatly enhanced, and the service life of titanium dioxide is prolonged; and the alkaline aluminum and acidic aluminum parallel flow coating of the aluminum oxide greatly saves the space of a coating tank, so the coating amount of titanium dioxide by one coating tank is increased, the yield is increased within the same time, and the economic benefit can be well improved.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide production, in particular to a surface treatment process for paper-making special titanium dioxide. Background technique [0002] Titanium dioxide (commonly known as titanium dioxide) is currently the best white pigment in the world. It not only has very stable physical and chemical properties, but also has excellent optical and electrical properties such as high refractive index, best hiding power, best whiteness and brightness, and is widely used. Used in coatings, plastics, paper, ink, electronics and other fields. In the field of papermaking, decorative paper is the one that uses the most titanium dioxide, and the quality of titanium dioxide used in decorative paper is high, especially for white decorative paper, where the amount of titanium dioxide used can reach 45%. Decorative paper is an integral part of the coating material of decorative thermosetting plastics. In the product st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06D21H19/38
CPCC09C1/3653C09C3/06D21H19/385
Inventor 刘琦淦文军袁立军罗静
Owner CHONGQING TITANIUM IND OF PANGANG GROUP
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