Preparation method of titanium dioxide pigment special for coating with high weather resistance

A technology of titanium dioxide and weather-resistant coatings, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problem that the coating film is not as dense as the alkaline silicon-coated film, the silicon film is not as compact as the product, and the weather resistance of the product is not as good and other problems, to achieve the effect of excellent hiding performance, excellent anti-powdering ability and excellent dispersion performance

Active Publication Date: 2019-01-25
中信钛业股份有限公司
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  • Application Information

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Problems solved by technology

[0003] CN101885926 and CN 102070921 disclose a production method of rutile titanium dioxide, by coating dense hydrated silicon oxide film, loose hydrated silicon oxide film and aluminum oxide film, while maintaining its high whiteness and basic weather resistance, Improve the hiding power of the product, but there are too many loose films, resulting in too high oil absorption of the product, and there are problems such as excessive viscosity in some solvent coating systems
CN101885926 and CN 102070921 disclose the use of acidic coating of dense silicon, and the density of silicon coating is still different from that under alkaline conditions, resulting in products with poorer weather resistance than products coated with silicon under alkaline conditions
In addition, CN 102070921 discloses that organosilicon is used as the outermost coating layer, which is not suitable for application in water-based coating systems.
[0004] After a large number of experimental studies, it was found that the acidic silicon-coated film, that is, adding alkaline silicate to the acidic slurry system, caused a hydrolysis reaction due to partial contact with sodium silicate, resulting in a less compact coating film than the alkaline silicon-coated film, resulting in The weather resistance is slightly poor, and the oil absorption is relatively high; and the down-flow silicon coating process under alkaline conditions also has the inorganic acid dripping into the alkaline system containing sodium silicate, resulting in a local pH value that is too low, and some silicates are hydrolyzed Too fast, resulting in the density of the silicon film is not as dense as that of the silicon film under the process conditions of co-flow silicon

Method used

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  • Preparation method of titanium dioxide pigment special for coating with high weather resistance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a mass concentration of 20%, use a pH meter to detect the pH value of the slurry during the entire coating process, and use sodium hydroxide solution Adjust slurry pH to 9.5, add sodium silicate solution, the concentration of sodium silicate solution is SiO 2 Calculated as 100g / L, the amount of sodium silicate solution added is calculated as SiO in sodium silicate 2 accounted for TiO 2 0.2% by weight, aging for 20 minutes;

[0023] 1.2. Heat the ground slurry to 70°C, and maintain this temperature throughout the coating process;

[0024] 1.3. Evenly add 3.0% (as SiO 2 accounted for TiO 2 by weight) water-soluble sodium silicate solution, its concentration is SiO 2 Calculated at 100g / L, and at the same time, use a 5% sulfuric acid solution to maintain the pH value of the slurry at 10.5±0.2, and mature for 30 minutes to form ...

Embodiment 2

[0029] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a mass concentration of 30%, and use a pH meter to detect the pH value of the slurry in the entire coating process, and use potassium hydroxide solution Adjust slurry pH to 11.0, add potassium silicate solution, the concentration of potassium silicate solution is SiO 2 Calculated as 200g / L, the amount of potassium silicate solution added is calculated as SiO in potassium silicate 2 accounted for TiO 2 0.5% by weight, dispersed for 40 minutes;

[0030] 1.2. Heat the ground slurry to 90°C, and maintain this temperature throughout the coating process;

[0031] 1.3. Evenly add 5.0% water-soluble potassium silicate solution (as SiO2 accounted for TiO 2 weight), its concentration is SiO 2 Calculated at 200g / L, and at the same time, use a 10% nitric acid solution to maintain the pH value of the slurry at 9.0±0.2, and mature for 60 ...

Embodiment 3

[0036] 1.1. Weigh 400g of the primary rutile titanium dioxide powder prepared by the chlorination method, add deionized water to prepare a slurry with a mass concentration of 25%, use a pH meter to detect the pH value of the slurry during the entire coating process, and use sodium hydroxide solution Regulate slurry pH to 10.5, add sodium silicate solution, the concentration of sodium silicate solution is SiO 2 Calculated as 150g / L, the amount of sodium silicate solution added is the amount of SiO in sodium silicate 2 accounted for TiO 2 0.3% by weight, dispersed for 30 minutes;

[0037] 1.2. Heat the ground slurry to 80°C, and maintain this temperature throughout the coating process;

[0038] 1.3, Add 4.0% evenly within 100min (as SiO 2 accounted for TiO 2 by weight) water-soluble sodium silicate solution, its concentration is SiO 2 The calculated value is 150g / L, and at the same time, a 10% hydrochloric acid solution is used to maintain the pH value of the slurry at 10±0...

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Abstract

The invention relates to a preparation method of a titanium dioxide pigment special for a coating with high weather resistance. A chlorination process is adopted for preparing a rutile type titanium dioxide preliminary product, deionized water is used for beating, the preliminary product is prepared into titanium dioxide slurry, and a dispersing agent is added for grinding treatment; a water-soluble silicate solution is added to form a first layer of dense silicon film, a water-soluble alkaline aluminate solution is added to form a second layer of dense aluminum film, and the water-soluble alkaline aluminate solution is added again to form a third layer of loose aluminum film; water washing is conducted to obtain a filter cake, and then drying and steam crushing treatment are conducted toobtain the titanium dioxide pigment special for the coating with high weather resistance. The method has the advantages that the titanium dioxide pigment prepared by means of the method has the advantages of excellent weather resistance, powdering resistance, covering performance and dispersing performance in the coating, and the prepared titanium dioxide pigment has the advantages that the coloris medium, the phase is low, and color blending is easy.

Description

technical field [0001] The invention relates to a method for preparing a special titanium dioxide pigment for high weather resistance coatings in the field of chemical industry. Background technique [0002] Titanium dioxide is one of the most important fine chemical raw materials. It has become the most widely used white pigment due to its high refractive index, high decolorizing power and high hiding power. It is called "the king of white pigments" and is widely used in coatings, plastics, In industrial production such as paper making, rubber, chemical fiber, etc. Among them, the coating industry uses the largest amount of titanium dioxide, accounting for more than 60% of the total. Titanium dioxide pigment is an important part of coatings. Its purpose is to cover and impart color and durability to the coating. The quality of coatings is very important. Much depends on the quality of the pigment. However, titanium dioxide without surface treatment has photocatalytic acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06C09C3/08
CPCC09C1/3623C09C1/3661C09C1/3669C09C3/006C09C3/041C09C3/063C09C3/08
Inventor 吴琼姜志刚王建伟刘立新穆宇同任健梁职
Owner 中信钛业股份有限公司
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