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High water dispersity titanium dioxide and coating method thereof

A titanium dioxide and dispersive technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of unreachable, high coating volume, poor dispersion performance, etc., and achieve reduced production costs and simple steps , the effect of broad application prospects

Active Publication Date: 2008-08-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The patent application with the patent publication number of CN1454939A discloses a nano-TiO coated with alumina alone. 2 It is a method to improve its dispersibility and weather resistance, but the amount of coating of aluminum in this method is relatively high, and generally 10% to 20% of the coating is required to significantly improve its dispersibility
Li Jingxian, Liu Shu, et al. Nano-TiO 2 The method and principle of inorganic coating on the surface of particles, China Ceramic Industry, Volume 12, Issue 1, February 2005, mentioned silicon and aluminum composite coating, and controlled SiO 2 :Al 2 o 3 It is 1:1~2:1, but the ratio of silicon and aluminum composite coated TiO 2 The dispersibility of TiO is also not good, and the high water dispersibility of TiO in this field cannot be achieved. 2 requirements

Method used

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  • High water dispersity titanium dioxide and coating method thereof
  • High water dispersity titanium dioxide and coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0024] Experimental Example 1 Al 2 o 3 with SiO 2 Determination of the amount of coating

[0025] According to data reports (Tang Zhenyu. Titanium dioxide production and environmental governance [M]. Chemical Industry Press, 2000, 1: 189-190) SiO 2 / Al 2 o 3 When the molar ratio is greater than 1 (the following are all molar ratios), it is beneficial for TiO 2 Water dispersibility, so the experiment studied SiO under the conditions of suitable coating temperature, suitable coating pH value and co-current neutralization mode. 2 / Al 2 o 3 The dispersibility at 0, 1:1, 2:1, 3:1, 4:1 and 5:1 is reflected by the size of the surface potential.

[0026] Test conditions: coating temperature 90°C, coating pH: silicon-coated 10.6-12.0, aluminum-coated 9.4-10.6, sodium silicate concentration 80-120g / l, sulfuric acid concentration 10%-15%, sodium aluminate The concentration is 80~120g / l.

[0027] Test results: iffigure 1 shown.

[0028] From figure 1 It can be seen that with S...

Embodiment 1

[0035] Embodiment 1 Preparation of highly water-dispersible titanium dioxide

[0036] 1200g of the primary product of titanium dioxide is beaten with deionized water to form a TiO-containing 2 To make a 200g / l slurry, add 4.8g of sodium hexametaphosphate, and at the same time use 10% to 15% NaOH solution to adjust the pH of the system to 9.0. Sand the slurry to 325 mesh and dilute to TiO with deionized water 2 120g / l. Take 120g / l TiO 2 Slurry 5000ml (containing TiO 2 600 g), heated to 90°C, and adjusted the pH of the system to 10.6 with 10% to 15% NaOH at the same time, kept the temperature for 10 minutes and detected the pH of the system. Add 180ml of 100g / l sodium silicate solution to the system at a constant speed within 150min, and at the same time add 20% dilute sulfuric acid dropwise to the system to ensure that the pH of the system is 10.6, and ripen for 30min after the addition. Use 10% dilute sulfuric acid to adjust the pH of the system to 9.0, keep it warm for 1...

Embodiment 2

[0038] Example 2 Preparation of highly water-dispersible titanium dioxide

[0039] 1200g rutile nano-TiO 2 Beating with deionized water into TiO-containing 2 To make a slurry of 180g / l, add 3.6g of sodium hexametaphosphate, and at the same time use 10% to 15% NaOH solution to adjust the pH of the system to 9.5. Sand the slurry to 325 mesh and dilute to TiO with deionized water 2 100g / l. Take 100g / l TiO 2 Slurry 6000ml (containing TiO 2 600 g), heated to 90°C, and adjusted the pH of the system to 11.2 with 10% to 15% NaOH at the same time, kept the temperature for 10 minutes and detected the pH of the system. Add 300ml of 80g / l sodium silicate solution to the system at a constant speed within 180min, and at the same time add 20% dilute sulfuric acid dropwise to the system to ensure that the pH of the system is 11.2, and ripen for 30min after the addition. Use 10% dilute sulfuric acid to adjust the pH of the system to 9.8, keep it warm for 10 minutes and check the pH of th...

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Abstract

The invention relates to titanium dioxide with high water dispersibility and a coating process, belonging to the chemical industry field, which solves the technical problem that titanium dioxide which is produced by a current process has lower dispersibility. The coating process of titanium dioxide with high water dispersibility of the invention comprises the steps of beating, silicon coating, aluminum coating, scouring, drying and disintegrating and the like, wherein sodium aluminate solution is used to conduct coating in the aluminum coating step, and sodium silicate solution is used to conduct coating in the silicon coating step, wherein the molar ratio of sodium aluminate solution usage which is calculated with A1 2 O3 and sodium silicate usage which is calculated with SiO 2 is 1:4. The process of the invention can be used to prepare titanium dioxide with high water dispersibility, which has widespread application prospect, and the Haegeman index of titanium dioxide which is prepared can reach over 7.0 in emulsion paint.

Description

technical field [0001] The invention relates to highly water-dispersible titanium dioxide and a coating method thereof, belonging to the field of chemical industry. Background technique [0002] Titanium dioxide is widely used in the fields of coatings, plastics, papermaking and chemical fibers due to its advantages of good whiteness, strong decolorization power and high refractive index. With the wide application of titanium dioxide, people have higher and higher requirements for the performance of titanium dioxide. Some specific fields have high requirements for the specific performance of titanium dioxide, such as high water dispersibility, high weather resistance, high hiding power, etc. For the research of highly water-dispersible titanium dioxide, some progress has been made both at home and abroad. [0003] The patent application with the patent publication number of CN1454939A discloses a nano-TiO coated with alumina alone. 2 It is a method to improve its dispersib...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
Inventor 杜剑桥王兰武阳露波
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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