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Preparation method of titanium pigment used in ship paint

A technology of titanium dioxide and coatings, applied in chemical instruments and methods, fibrous fillers, inorganic pigments, etc., can solve the problems of no longer applicable, achieve good dispersion, stable and easy-to-control process, and easy-to-obtain process raw materials Effect

Active Publication Date: 2011-10-26
NINGBO XINFU TITANIUM DIOXIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melting point of triethanolamine is only 21.2°C, and the melting point of benzenesulfonic acid is only 44°C, and the actual operating temperature in the steam powder machine is as high as 250°C, so the usual method and equipment for adding organic coatings are no longer applicable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of titanium dioxide for marine coatings, comprising the following steps: a. Calcining metatitanic acid treated with KP reagent and Al salt above 900°C to obtain TiO2 with crystal structure of rutile crystal form and content ≥ 99.5% titanium The crude white powder is crushed, moistened and wet-milled to obtain TiO 2 Slurry, dilute the slurry to make TiO 2 Concentration to 300g / L, adjust the pH value of the slurry to 12 with sodium hydroxide solution, add the inorganic dispersant sodium hexametaphosphate, the amount of which is TiO 2 TiO 2 The mass percentage of the meter, the sodium hexametaphosphate is P 2 o 5 Calculated as 0.1%.

[0026] b, the TiO obtained in step a 2 The slurry is heated to 30°C with steam, and the silicon-containing compound is added in 30 minutes under stirring. The silicon-containing compound is sodium silicate, and the amount of sodium silicate is TiO 2 TiO 2 The mass percentage of the meter, the sodium silicate additi...

Embodiment 2

[0034] A preparation method of titanium dioxide for marine coatings, comprising the following steps: a. Calcining metatitanic acid treated with KP reagent and Al salt above 900°C to obtain TiO2 with crystal structure of rutile crystal form and content ≥ 99.5% titanium The crude white powder is crushed, moistened and wet-milled to obtain TiO 2 Slurry, dilute the slurry to make TiO 2 Concentration to 400g / L, adjust the pH value of the slurry to 8 with potassium hydroxide solution, add the inorganic dispersant sodium hexametaphosphate, the amount of which is TiO 2 TiO 2 The mass percentage of the meter, the sodium hexametaphosphate is P 2 o 5 Calculated as 0.2%.

[0035] b, the TiO obtained in step a 2 The slurry is heated to 100°C with steam, and the silicon-containing compound is added in 15 minutes under stirring. The silicon-containing compound is potassium silicate, and the amount of potassium silicate is TiO 2 TiO 2 The mass percentage of the meter, the potassium sil...

Embodiment 3

[0043] A preparation method of titanium dioxide for marine coatings, comprising the following steps: a. Calcining metatitanic acid treated with KP reagent and Al salt above 900°C to obtain TiO2 with crystal structure of rutile crystal form and content ≥ 99.5% titanium The crude white powder is crushed, moistened and wet-milled to obtain TiO 2 Slurry, dilute the slurry to make TiO 2 Concentration to 350g / L, adjust slurry pH value to 10 with sodium hydroxide solution.

[0044] b, the TiO obtained in step a 2 The slurry is heated to 80°C with steam, and the silicon-containing compound is added in 20 minutes under stirring. The silicon-containing compound is potassium sodium silicate, and the amount of potassium sodium silicate is TiO 2 TiO 2 The mass percentage of the meter, the potassium sodium silicate addition is SiO 2 Calculated as 2%, and homogenized for another 15 minutes.

[0045] C, the TiO that step b obtains with nitric acid solution within 140 minutes 2 The pH of...

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Abstract

The invention discloses a preparation method of titanium pigment used in ship paint. The method comprises the following steps that: a. metatitanic acid is calcined, such that a titanium pigment crude product is obtained, the titanium pigment crude product is prepared into TiO2 slurry, and sodium hexametaphosphate is added to the slurry; b. the slurry is heated, a silicon-containing compound is added to the slurry, and the slurry is homogenized; c. the pH value of the TiO2 slurry is regulated to 0.8 to 4; d. after the slurry is slaked, an organic dispersant is added to the slurry, an aluminum-containing compound is added to the slurry, and the mixture is homogenized; e. the pH value of the TiO2 slurry is regulated to 4 to 8; f. the TiO2 slurry is slaked; g. the TiO2 slurry is filtered, such that the resistivity of the filter cake is greater than or equal to 100 [omega]M; and the filter cake is dried and heat treated; h. an organic surface conditioning agent is added to the filter cake, and the filter cake is crushed, such that the finished product is obtained. According to the present invention, nano-sized silicon oxide sol and alumina sol are prepared sequentially. Through physical adsorption and chemical absorption, a compact coating layer is formed on the surface of the TiO2 particles. Then, the coating layer is firmly attached to the surface of the TiO2 particles through chemical deposition. With the coating layer, the product provided by the present invention possesses good dispersibility, weatherability and corrosion resistance. Meanwhile, according to the method provided by the present invention, the raw materials are easy to obtain, the processes are smooth and are easy to control.

Description

technical field [0001] The invention belongs to the field of chemical production, and specifically relates to a preparation method of titanium dioxide for marine coatings. The titanium dioxide prepared according to the method is widely used in ports, ships, offshore oil drilling platforms, and ocean exploration that are easily eroded by the environment. Coatings for equipment, etc. Background technique [0002] Various operating platforms for developing the ocean, such as ports, ships, offshore oil drilling platforms, and ocean exploration equipment, mostly use steel structure facilities. Direct sunlight makes the surface temperature as high as 60°C, and the long-term irradiation of ultraviolet rays on the polymer resin used as the coating base material will cause the degradation of the molecular chain, thereby affecting the physical properties of the coating film. Strong ultraviolet radiation and friction with ice cubes require that the anti-corrosion period be equal to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/12C09C3/06
Inventor 陆祥芳陈跃晏育刚谢登岗
Owner NINGBO XINFU TITANIUM DIOXIDE
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