Method for preparing titanium dioxide pigment with high-temperature resistance

A technology of titanium dioxide and high temperature resistance, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems affecting performance, rough and porous, unsuitable for operation, etc., to achieve increased suspension performance, uniform system, and good whitening The effect of degree and dispersion

Active Publication Date: 2011-09-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the U.S. patent US4075031 is coated at a high temperature of 90 ° C. Due to the high temperature, the reaction is not easy to control, and the deposits cannot be completely deposited on the titanium dioxide particles, which affects its performance.
U.S. Patent US3897261 provides two depositions of silicon dioxide and aluminum oxide on titanium dioxide particles at a temperature of 60°C and a pH of 7, but this method has poor weather resistance due to lack of dense silicon coating
Chinese patent ZL200610020846.7 provides deposition of silica and alumina at a temperature of 60°C to 85°C. Due to the rough and porous surface of the pigment particles, the product is only suitable for architectural coatings with high pigment volume concentration; in the technical proposal, twice Deposit silicon dioxide and reduce the temperature before the second deposition of silicon dioxide, which is not conducive to industrial operation
Chinese patent ZL200610020847.1 provides a production method of highly weather-resistant titanium dioxide pigment, which improves the weather resistance of the product by increasing the amount of coating, and the amount of dense silica coating and alumina coating of the product is not less than 3.5%; and after silica coating, aluminum oxide coating is achieved by lowering the temperature, which is not suitable for industrial production

Method used

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  • Method for preparing titanium dioxide pigment with high-temperature resistance
  • Method for preparing titanium dioxide pigment with high-temperature resistance

Examples

Experimental program
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Effect test

Embodiment 1

[0035] With deionized water, 1000g of titanium dioxide primary product (rutile titanium dioxide produced by the chlorination method, Pangang Group Jinzhou Titanium Industry Co., Ltd.) is formulated into a slurry with a mass concentration of 320g / L, and the mass percentage of adding sodium hydroxide is 10% sodium hydroxide aqueous solution to adjust the pH to 10.5, add 0.3L of sodium hexametaphosphate aqueous solution containing sodium hexametaphosphate with a mass concentration of 70g / L, then pass the slurry into the sand mill for sand grinding, after sand grinding The slurry was filtered through a sieve to remove coarse particles, and then added to the coating tank while stirring and heating up to 65°C, and the temperature was kept constant until the coating was completed. Start to pack dense silicon dioxide, drop the relative titania initial product amount (in terms of TiO 2 by mass) 1.5% aqueous solution of sodium silicate (as SiO 2 mass meter), the sodium silicate aqueous...

Embodiment 2

[0037] With deionized water, 1000g of titanium dioxide primary product (rutile titanium dioxide produced by sulfuric acid method, Ningbo Xinfu Titanium Dioxide Co., Ltd.) is prepared into a slurry with a concentration of 320g / L, and adding a mass percentage of 20% sodium hydroxide aqueous solution, Adjust the pH to 10, add 0.4L of sodium hexametaphosphate aqueous solution with a mass concentration of 70g / L, then pass the slurry into the sand mill for sanding, and filter the sanded slurry through a sieve to remove coarse particles, then add Into the coating tank, while stirring and raising the temperature to 70°C, and keep the temperature constant until the coating is completed. Start to pack dense silicon dioxide, drop the relative titania initial product amount (in terms of TiO 2 by mass) 2.7% aqueous solution of sodium silicate (as SiO 2 mass), the dropping time was 3 hours, the mass concentration of the sodium silicate aqueous solution was 30 g / L, and simultaneously, a 2% ...

Embodiment 3

[0039] With deionized water, 1000g of titanium dioxide primary product (anatase titanium dioxide produced by sulfuric acid method, Ningbo Xinfu Titanium Dioxide Co., Ltd.) is prepared into a slurry with a concentration of 320g / L, and adding a 20% aqueous sodium hydroxide solution Adjust the pH to 8, add 0.5L of sodium hexametaphosphate aqueous solution with a mass concentration of 70g / L, then pass the slurry into the sand mill for sand grinding, and filter the coarse particles through the screen after sand grinding, then add Into the coating tank while stirring and raising the temperature to 55°C and holding the temperature until the coating is complete. Start to pack dense silicon dioxide, drop the relative titania initial product amount (in terms of TiO 2 by mass) 1.0% sodium silicate aqueous solution (as SiO 2 mass), the dropping time is 3h, the mass concentration of the sodium silicate aqueous solution is 65g / L, and simultaneously, a sulfuric acid solution with a mass per...

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Abstract

The invention discloses a method for preparing a titanium dioxide pigment with high-temperature resistance. The method comprises that: blending a primary titanium dioxide product into slurry by using distilled water or deionized water; regulating the slurry with pH value from 8 to 11 by using an alkaline solution; adding a dispersant, then performing a sand milling and filtering; heating the filtered slurry to the temperature of 50 DEG C to 75 DEG C and keeping the temperature unchanged in the whole process of coating; adding a sodium silicate aqueous solution, adding an acid solution for regulating the slurry with pH value of 8 to 11 and keeping the pH value unchanged; adding the acid solution to regulate the pH value of 2 to 7, then slaking; adding an aluminum salt aqueous solution, cocurrenting the acid solution or the alkaline solution for keeping the pH value unchanged, uniformly stirring after dropping; adding the alkaline solution to regulate the pH value of 6 to 8, then filtering, washing and drying after stirring, crushing by air flow and performing an organically treatment. According to the invention, the titanium dioxide pigment has the advantages of high temperature tolerance, good whiteness and good dispersibility. The method for preparing the titanium dioxide pigment with high-temperature resistance of the present invention has the advantages of good controllability, strong operability, low energy consumption and easy industrialization.

Description

technical field [0001] The invention relates to the technical field of preparation of titanium dioxide pigments, in particular to a preparation method of high temperature-resistant titanium dioxide pigments. Background technique [0002] Titanium dioxide has become the best white pigment because of its high refractive index, strong decolorizing power, good gloss and whiteness, and is widely used in the fields of coatings, plastics, papermaking, inks and chemical fibers. Since titanium dioxide, especially rutile titanium dioxide, has photocatalytic activity, it will catalyze and degrade the organic components in contact with it during use, causing the coating to lose gloss and pulverize and fall off, seriously reducing various performances and service life of the product. Especially in the field of powder coatings and masterbatches, it is often necessary to keep the raw materials at a high temperature of 150°C or 280°C, which causes a lot of titanium dioxide to change color. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/04
Inventor 孙爱华储成义宴育刚陆祥芳李勇许高洁
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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