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Method of preparing hydrophobic nano-titanium dioxide powder

A nano-titanium dioxide, hydrophobic technology, applied in the field of nanomaterials, can solve the problems of unsatisfactory inorganic surface treatment effect, no mention of nano-titanium dioxide organic surface treatment, limitations in the application field of nano-titanium dioxide, etc., to achieve excellent light stability and easy control. , the effect of convenient operation

Active Publication Date: 2009-02-18
江苏科纳新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1144838C coats silica (silicon oxide), aluminosilicate or aluminum oxide on the surface of titanium dioxide particles with an average particle size not greater than 80nm, and is used in rubber compositions of elastomers as an anti-ultraviolet agent, and does not mention the use of nano titanium dioxide. organic surface treatment
Chinese patent CN1982349A uses butyl titanate to carry out surface pretreatment to nano-titanium dioxide, then carries out surface polymerization with methyl methacrylate, through organic surface modification, although improved the dispersibility of nano-titanium dioxide particle in organic medium, stability and The performance of absorbing ultraviolet rays, but due to the lack of inorganic surface treatment, the application field of nano-titanium dioxide is greatly limited
But the effect of inorganic surface treatment is not ideal

Method used

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  • Method of preparing hydrophobic nano-titanium dioxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Specifically follow the steps below to implement:

[0026](1) Take 1000 g of nano-titanium dioxide aqueous dispersion with a mass percentage of 10% and place it in a 3000 mL three-necked flask, start the stirring device, adjust the temperature of nano-titanium dioxide aqueous dispersion to 40° C. 4% sodium aluminate aqueous solution and 5% phosphoric acid aqueous solution were added to the mixture, and the pH value of the system was maintained at 8.0. Amount of sodium aluminate to generate AlPO 4 The mass meter accounts for 4% of the mass of nano-titanium dioxide. After adding the aqueous sodium aluminate solution, continue stirring and aging at 40° C. for 10 minutes.

[0027] (2) The temperature of the nano-titanium dioxide aqueous dispersion is raised to 95° C., adding a mass percentage of 10% sodium silicate aqueous solution and a mass percentage of 5% nitric acid aqueous solution to the nano-titanium dioxide aqueous dispersion respectively, and maintaining the sys...

Embodiment 2

[0032] Specifically follow the steps below to implement:

[0033] (1) Measure 1000 g of the nano-titanium dioxide aqueous dispersion that is 25% by mass and place it in a 3000 mL three-necked flask, start the stirring device, adjust the temperature of the nano-titanium dioxide aqueous dispersion to 80° C. A 10% aqueous solution of sodium aluminate and a 10% aqueous solution of phosphoric acid were added to the mixture, and the pH of the system was maintained at 10.0. Amount of sodium aluminate to generate AlPO 4 The mass meter accounts for 10% of the mass of nano-titanium dioxide. After adding the aqueous sodium aluminate solution, continue stirring and aging at 80° C. for 60 minutes.

[0034] (2) maintaining the temperature of the nano-titanium dioxide aqueous dispersion at 80°C, adding a mass percentage of 20% sodium silicate aqueous solution and a mass percentage of 10% hydrochloric acid aqueous solution to the nano-titanium dioxide aqueous dispersion, and maintaining the...

Embodiment 3

[0039] Specifically follow the steps below to implement:

[0040] (1) Take 1000 g of nano-titanium dioxide aqueous dispersion with a mass percentage of 15% and place it in a 3000mL three-necked flask, start the stirring device, adjust the temperature of nano-titanium dioxide aqueous dispersion to 60°C, and pour into nano-titanium dioxide aqueous dispersion respectively A 7% aqueous solution of sodium aluminate and a 7% aqueous phosphoric acid solution were added to maintain the pH value of the system at 9.0. Amount of sodium aluminate to generate AlPO 4 The mass meter accounts for 6% of the mass of nano-titanium dioxide. After adding the aqueous sodium aluminate solution, continue stirring and aging at 60° C. for 30 minutes.

[0041] (2) The temperature of the nano-titanium dioxide aqueous dispersion is raised to 90° C., adding a mass percentage of 15% sodium silicate aqueous solution and a mass percentage of 8% sulfuric acid aqueous solution to the nano-titanium dioxide aqu...

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Abstract

The invention discloses a method for preparing the hydrophobic nano titanium powder. Nano titanium dioxide is firstly conducted the inorganic surface processing in the liquid phase of the nano titanium water dispersion, and then is conducted the organic surface processing, and finally the nano titanium serum is filtered and washed until the electrical conductivity of the filtrate is less than 500 micro simens per centimeter, and is dried and crashed to get the hydrophobic nano titanium dioxide powder. The invention integrates the inorganic and the organic surface processing of the nano titanium dioxide, so that the surface nature of the nano titanium dioxide is changed, and the filtration speed of the nano titanium dioxide in the solid-liquid separation process is increased, and the loss rate of the nano titanium dioxide is reduced, and the craftwork flow process is short, and the operation is convenient and is easy to be controlled. The prepared nano titanium dioxide powder not only has good hydrophobic nature, but also has excellent light stability.

Description

technical field [0001] The invention relates to a method for preparing hydrophobic nano titanium dioxide powder, in particular to a method for inorganic surface treatment and organic surface treatment of nano titanium dioxide, and belongs to the field of nanometer materials. Background technique [0002] Nano-titanium dioxide is an important inorganic ultraviolet shielding agent, widely used in sunscreen cosmetics, plastics, rubber, chemical fibers, coatings and other fields. Titanium dioxide is an N-type semiconductor. When ultraviolet light with a wavelength of less than 400nm irradiates titanium dioxide, electrons in the valence band can absorb ultraviolet light and be excited to the conduction band, and at the same time generate electron-hole pairs, and some electron-hole pairs will migrate. to the surface, resulting in hydroxyl radicals and adsorbed water on the surface of titanium dioxide to generate hydroxyl radicals, which have a strong oxidizing ability and will oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
Inventor 姚超吴凤芹陈志刚丁永红张国庆曾永斌方志成李为民
Owner 江苏科纳新材料有限公司
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