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Method for preparing multifunctional titanium dioxide pigment with chlorination method

A titanium dioxide, multi-functional technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as insufficient weather resistance, prevent powder loss, improve dispersion performance, and improve weather resistance. Effect

Active Publication Date: 2011-06-01
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

CN97190344.1 introduces the process of coating various forms of aluminum film, which can effectively improve the dispersion and hiding power of the product. Since the produced pigment is not coated with dense silica, the weather resistance of the product cannot meet most weather resistance requirements. field needs

Method used

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  • Method for preparing multifunctional titanium dioxide pigment with chlorination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Weigh 500g of the primary product of titanium dioxide by chloride method, and the content of alumina in the primary product is 1.2%.

[0022] 2. Add deionized water to prepare a 500g / l slurry, adjust the pH value of the slurry to 10.0 with sodium hydroxide solution, add sodium hexametaphosphate solution, the amount of sodium hexametaphosphate solution is based on five Phosphorus oxide accounted for 0.5% by weight of the primary product of titanium dioxide, and dispersed for 30 minutes.

[0023] 3. Add sand into the sand mill, and sand-mill the above-mentioned slurry. After sand-milling, the average particle size of the slurry is 300nm, and the particle size distribution is calculated by quantity. The proportion exceeding 1000nm is 0.24%.

[0024] 4. Remove the grinding media from the slurry.

[0025] 5. Raise the temperature of the above slurry to 80°C.

[0026] 6. Add sodium silicate solution at one time, the amount of sodium silicate solution added is 1.0% based ...

Embodiment 2

[0033] 1. Weigh 400g of the primary product of titanium dioxide by chloride method, and the content of alumina in the primary product is about 0.6%.

[0034] 2. Add deionized water to prepare a 400g / l slurry, adjust the pH value of the slurry to 9.0 with sodium hydroxide solution, add sodium hexametaphosphate solution, the amount of sodium hexametaphosphate solution is five Phosphorus oxide accounted for 0.1% by weight of the primary product of titanium dioxide, and dispersed for 20 minutes.

[0035] 3. Add sand into the sand mill, and sand-mill the above-mentioned slurry. The average particle size of the slurry is 365nm, and the particle size distribution is calculated by quantity, and the proportion exceeding 1000nm is 0.55%.

[0036] 4. Remove the grinding media from the slurry.

[0037] 5. Raise the temperature of the sand-milled slurry to 60°C.

[0038] 6. Add sodium silicate solution at one time, the amount of sodium silicate solution added is 0.5% based on the weight ...

Embodiment 3

[0045] 1. Weigh 600g of the primary product of titanium dioxide by the chloride method, and the content of alumina in the primary product is 1.5%.

[0046] 2. Add deionized water to prepare a 500g / l slurry, adjust the pH value of the slurry to 11.0 with sodium hydroxide solution, add sodium hexametaphosphate solution, the amount of sodium hexametaphosphate solution is based on five Phosphorus oxide accounts for 1.0% by weight of the primary titanium dioxide product, and is dispersed for 30 minutes.

[0047] 3. Add sand into the sand mill, and sand-mill the above-mentioned slurry. The average particle size of the slurry is 500nm, and the particle size distribution is calculated by quantity, and the proportion exceeding 1000nm is 1.0%.

[0048] 4. Remove abrasive impurities from the slurry.

[0049] 5. Raise the temperature of the sand-milled slurry to 90°C.

[0050] 6. Add 2.0% sodium silicate solution at one time, based on the weight of silicon dioxide in sodium silicate as ...

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Abstract

The invention relates to a method for preparing multifunctional titanium dioxide pigment with a chlorination method, which comprises the following steps of: blending a titanium dioxide primary product into titanium dioxide slurry by adopting a chlorination method and adjusting a pH value between 9.0 and 11.0; adding a phosphate dispersing agent and carrying out grinding treatment; removing a grinding medium from the slurry and heating; adding a water-soluble silicate solution for curing; adjusting the pH value of the slurry for forming amorphous silica and curing for forming a first coating layer; cooling the slurry to 50-70 DEG C; adding a sodium metaaluminate solution and curing; adjusting the pH value of the slurry between 8.0 and 9.0, curing and forming an amorphous alumina coating layer on the first coating layer; adding an aluminum salt solution, maintaining the pH of the slurry between 7.0 and 9.0 and curing; adjusting the pH value of the slurry between 6.0 and 7.0 and curing; and washing the slurry with deionized water till the conductivity of a filter cake is larger than 15,000 ohm.cm, and carrying out drying and steaming pulverizing treatment to obtain a finished product. The multifunctional titanium dioxide pigment prepared with the method has higher weather resistance, whiteness, covering capability, opacity and dispersibility and excellent processing performance in the fields of coating, plastics, papermaking, and the like.

Description

technical field [0001] The invention relates to a preparation method of multi-functional titanium dioxide pigment by chlorination method in the field of chemical industry. Background technique [0002] It is known that the surface treatment of titanium dioxide inorganic pigments is mainly based on silicon and aluminum oxides. The pigments produced by this coating process are used in coatings and plastic profiles to prevent chalking and loss of gloss. In paper It has good opacity when used in medium and good hiding power in flat latex paint. Precipitation of silica on titanium dioxide particles can usually improve the weather resistance of the pigment; with the increase of the density of silica and the increase of coating amount, the weather resistance of the pigment will continue to improve, and the coating amount of silica will increase, making it opaque Sexuality and hiding power will decrease accordingly. Precipitation of alumina onto titania particles generally improve...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09C3/04
Inventor 王建伟杜枫徐兴龙马英华吴琼马玉杰张炳
Owner 中信钛业股份有限公司
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