Preparation method for increasing weather fastness of titanium dioxide

A titanium dioxide and weather resistance technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of silicon film layer or titanium dioxide bare leakage, unable to form dense film, aluminum film is not very dense and so on , to achieve the effect of excellent weather resistance

Inactive Publication Date: 2019-05-17
HENAN BILLIONS NEW MATERIAL CO LTD
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  • Abstract
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Problems solved by technology

[0004] The most common coating methods are silicon-aluminum, zirconium-aluminum, phosphorus-aluminum, and single-aluminum coating. Silicon is mainly to improve weather resistance, but considering three-washing and dispersion, it will be coated with aluminum on the outer layer after silicon coating, which requires high solidity. Weather-resistant products are all coated with silicon-aluminum, so how to further improve the weather resistance of silicon-aluminum coated titanium dioxide is the key. Recently, people are mainly working on how to optimize the coating of silicon, but in fact, aluminum coating is also important for weather resistance. However, most literatures use the coating form of pH=8.0-9.0, and the aluminum film under this coating form is not very dense, so there may be silicon film layer or titanium dioxide partially exposed on the outside, and a dense film cannot be formed

Method used

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  • Preparation method for increasing weather fastness of titanium dioxide
  • Preparation method for increasing weather fastness of titanium dioxide
  • Preparation method for increasing weather fastness of titanium dioxide

Examples

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Effect test

Embodiment 1

[0032] Sand mill the kiln products of qualified calcined titanium dioxide, and then import the slurry with qualified particle size into the coating tank, and control the concentration of the slurry to 200g / L (based on TiO 2 At the same time, the temperature was raised to 85°C; NaOH was added to the slurry to adjust the pH=10.0, the addition was completed in 15 minutes, and homogenized for 30 minutes; 1.0% Na was added 2 SiO 3 , used for 20min, then homogenized for 20min; use dilute H 2 SO 4 Adjust pH = 7.0, take 120min, then homogenize for 30min; use dilute H 2 SO 4 Adjust pH=4.5, take 20 minutes, then homogenize for 20 minutes; add 1.0% Al at the same time 2 (SO4) 3 (in Al 2 o 3 flow together with NaOH, keep pH=4.5 for 60 minutes, and then homogenize for 30 minutes; import the obtained slurry into a sand mill and grind for 20 minutes; adjust the pH of the slurry to 8.0 with NaOH for 20 minutes, and then homogenize 30min; add 3.0%NaAlO at the same time 2 (in Al 2 o ...

Embodiment 2

[0034] Sand mill the kiln products of qualified calcined titanium dioxide, and then import the slurry with qualified particle size into the coating tank, and control the concentration of the slurry to 300g / L (based on TiO 2 At the same time, the temperature was raised to 85°C; NaOH was added to the slurry to adjust the pH=10.2, the addition was completed in 15 minutes, and homogenized for 30 minutes; 3.0% Na was added 2 SiO 3 , take 20min, then homogenize for 20min; use dilute HCl to adjust pH=7.2, take 120min, then homogenize for 30min; use dilute HCl to adjust pH=4.8, take 30min, then homogenize for 120min; 2 (SO 4 ) 3 (in Al 2 o 3 (meter) and NaOH in parallel flow, keep pH=4.8 for 60 minutes, then homogenize for 30 minutes; import the obtained slurry into a sand mill, and sand for 20 minutes; adjust the pH of the slurry to 8.5 with NaOH, take 20 minutes, and then homogenize 30min; add 2.0%NaAlO at the same time 2 (in Al 2 o 3) and dilute HCl in parallel flow, keep p...

Embodiment 3

[0036] Sand mill the kiln products of qualified calcined titanium dioxide, and then import the slurry with qualified particle size into the coating tank, and control the concentration of the slurry to 400g / L (based on TiO 2 At the same time, the temperature was raised to 85°C; KOH was added to the slurry to adjust the pH=10.5, the addition was completed in 15 minutes, and homogenized for 30 minutes; 6.0% Na was added 2 SiO 3 , used for 20min, then homogenized for 20min; use dilute H 2 SO 4 Adjust the pH to 7.5 for 120 minutes, then homogenize for 30 minutes; use dilute H 2 SO 4 Adjust pH=5.5, take 30 minutes, then homogenize for 120 minutes; add 3.0% Al at the same time 2 (SO 4 ) 3 (in Al 2 o 3 meter) and KOH in parallel flow, keep pH=5.5 for 60 minutes, and then homogenize for 30 minutes; import the obtained slurry into a sand mill and grind for 20 minutes; adjust the pH of the slurry to 9.0 with dilute KOH for 30 minutes, and then Homogenize for 30min; add 1.0%NaAlO...

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Abstract

The invention belongs to the technical field of titanium dioxide preparation, and discloses a preparation method for increasing the weather fastness of titanium dioxide. The preparation method comprises the following steps: preparing titanium dioxide slurry; rising the temperature of the slurry to 80 to 90 DEG C, regulating pH (Potential of Hydrogen) to be 10.0 to 10.5, adding Na2SiO3 after homogenizing, and then homogenizing; regulating the pH of the slurry to be 4.5 to 5.5, enabling aluminum salt and diluted acid or diluted alkali to be in concurrent flow, keeping the pH of the slurry to be4.5 to 5.5, and then homogenizing; grinding the slurry for 15 to 30 minutes; regulating the pH of the slurry after grinding to be 8.0 to 9.0, homogenizing, then enabling the aluminum salt and the diluted acid or diluted alkali to be in concurrent flow, keeping the pH of the slurry to be 8.0 to 9.0, and then homogenizing; regulating the pH of the slurry to be 5.4 to 5.6, homogenizing, and then carrying out tertiary washing, flash evaporation and jet pulverization, thus obtaining a titanium dioxide finished product. The titanium dioxide prepared by the invention is higher in weather fastness andbetter in dispersity.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide preparation, and in particular relates to a preparation method for improving the weather resistance of titanium dioxide. Background technique [0002] Titanium dioxide is the white pigment with the best hiding power, widely used in coatings, plastics, paper, ink and other industries. Different post-treatments are carried out according to the different application fields of titanium dioxide, the purpose is to improve its application performance, such as improving the weather resistance, hiding power, gloss, and dispersibility in the application system of titanium dioxide, among which the weather resistance is titanium dioxide. The main application performance and important characterization indicators. Therefore, improving the weather resistance of titanium dioxide has become the research direction of every titanium dioxide enterprise. [0003] Weather resistance refers to the ability of ...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06
Inventor 陈建立李瑞瑞冯亚阳王永珊石强强曹青喜王莉萍赵丁王欢欢张健
Owner HENAN BILLIONS NEW MATERIAL CO LTD
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