Preparation method of titanium dioxide pigment special for laminated paper

A titanium dioxide, special-purpose technology, applied in the field of preparation of special-purpose titanium dioxide pigments for laminated paper, can solve the problems of very high light resistance index requirements, loss of light, etc. Effect

Active Publication Date: 2012-07-04
中信钛业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Titanium dioxide has become the best white pigment because of its excellent optical properties, and is widely used in the paper industry, and the decorative paper industry is the main application industry of titanium dioxide in the papermaking field. Decorative paper is also called laminated paper, which is mainly used in wood-based panels. Veneers and decorative papers have very high requirements on the light resistance of pigments. However, titanium dioxide, as a white pigment, has certain defects, that is, there are many photoactivation points on the surface of titanium dioxide. Under the action of ultraviolet light, the oxygen ions on its lattice can Two electrons are lost to become oxygen atoms, and the released electrons are captured by tetravalent titanium ions, which are reduced to trivalent titanium ions. The active hydroxyl groups and peroxyl hydroxyl radicals released by the reaction are highly active and can make titanium dioxide The surrounding organic polymers are oxidized and degraded, and there are damage phenomena such as loss of light and discoloration
The methods proposed by US578574, CN1132769A and CN101857736A only solve the general requirements of the paper industry on the light resistance of titanium dioxide, and cannot meet the requirements of the laminated paper with special high light resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Weigh 500g of the primary titanium dioxide powder by the chloride method, add deionized water to prepare a 500g / L slurry, adjust the pH value of the slurry to 9.0 with a 20% sodium hydroxide solution, and add P 2 o 5 TiO in primary product 2 It is 0.1% sodium hexametaphosphate solution by weight, and the concentration of sodium hexametaphosphate solution is P 2 o 5 The calculation is 50g / L, and the dispersion time is 20min; the dispersed slurry is sand-milled in a sand mill, and the sand-milling medium is separated to obtain a slurry with an average particle size of 400nm, and the particle size distribution is calculated by number, and the proportion exceeding 800nm 1.0%.

[0028] 2. Raise the temperature of the sanded slurry to 40°C, and maintain this temperature throughout the coating process.

[0029] 3. Add CeO within 0.5h 2 TiO in primary product 2 It is 0.05% cerium nitrate solution by weight, and the concentration of cerium nitrate solution is CeO 2 Cal...

Embodiment 2

[0035] 1. Weigh 600g of the primary titanium dioxide powder by the chloride method, add deionized water to prepare a 600g / l slurry, adjust the pH value of the slurry to 9.5 with a concentration of 20% potassium hydroxide solution, and add 0.3% tripolymer Sodium phosphate solution, the concentration of sodium tripolyphosphate solution is P 2 o 5 The calculation is 100g / L, and the dispersion time is 30min; the dispersed slurry is sand-milled in a sand mill, and the sand-milling medium is separated to obtain a slurry with an average particle size of 382nm, and the particle size distribution is calculated by number, and the proportion exceeding 800nm 0.85%.

[0036] 2. Raise the temperature of the sanded slurry to 50°C, and maintain this temperature throughout the coating process.

[0037] 3. Add CeO within 0.5h 2 TiO in primary product 2 It is 0.2% cerium sulfate solution by weight, and the concentration of cerium sulfate solution is CeO 2 Calculated at 50g / L, while maintain...

Embodiment 3

[0043] 1. Weigh 700g of primary titanium dioxide powder by sulfuric acid method, add deionized water to prepare a 700g / l slurry, adjust the pH value of the slurry to 10 with a concentration of 20% sodium hydroxide solution, add 0.5% phosphoric acid solution, The concentration of phosphoric acid solution in P 2 o 5 The calculation is 150g / L, and the dispersion time is 30min; the dispersed slurry is sand-milled in a sand mill, and the sand-milling medium is separated to obtain a slurry with an average particle size of 335nm, and the particle size distribution is calculated by number, and the proportion exceeding 800nm was 0.62%.

[0044] 2. Raise the temperature of the sanded slurry to 60°C, and maintain this temperature throughout the coating process.

[0045] 3. Add CeO within 1.0h 2 TiO in primary product 2 It is 0.5% cerium sulfate solution by weight, and the concentration of cerium sulfate solution is CeO 2 Calculated at 70g / L, while maintaining the pH of the slurry be...

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Abstract

The invention discloses a preparation method of a titanium dioxide pigment special for laminated paper. The method specifically comprises the following steps of: preparing titanium dioxide rutile primary product into slurry, dispersing by using phosphorus compound-containing solution and grinding; heating the ground slurry and preserving heat; adding water-soluble cerium salt solution to adjust the pH value of the slurry and slaking to form a first cover layer; adding phosphorus compound-containing solution and zirconium salt solution to adjust the pH value of the slurry and slaking to form a second cover layer; adding aluminum salt solution to adjust the pH value of the slurry and slaking to form a third cover layer; filtering and washing filter cakes with de-ionized water, drying, aero-pulverizing and performing gas-solid separation to obtain a finished product. The method has a high-efficiency and rational production process; the prepared titanium dioxide pigment has high light resistance, high coverage capacity, superior retention and low isopotential point and has excellent dispersion performance in a weakly alkaline application system.

Description

technical field [0001] The invention relates to a preparation method of special-purpose titanium dioxide pigment for laminated paper. Background technique [0002] Titanium dioxide has become the best white pigment because of its excellent optical properties, and is widely used in the paper industry, and the decorative paper industry is the main application industry of titanium dioxide in the papermaking field. Decorative paper is also called laminated paper, which is mainly used in wood-based panels. Veneers and decorative papers have very high requirements on the light resistance of pigments. However, titanium dioxide, as a white pigment, has certain defects, that is, there are many photoactivation points on the surface of titanium dioxide. Under the action of ultraviolet light, the oxygen ions on its lattice can Two electrons are lost to become oxygen atoms, and the released electrons are captured by tetravalent titanium ions, which are reduced to trivalent titanium ions....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06D21H17/69
Inventor 齐牧于学成姜志刚王建伟徐兴龙杜凤马英华马玉杰
Owner 中信钛业股份有限公司
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