Preparation method of aqueous nano-TiO2 colloid

A nano-titanium dioxide, water colloid technology, applied in titanium dioxide, titanium oxide/hydroxide, nanotechnology and other directions, can solve the problems of complex process, difficult dispersion, complex process, and achieve simple production technology and production equipment, coating good film-forming ability and strong photocatalytic activity

Inactive Publication Date: 2012-10-17
江苏恒智纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, nano-titanium dioxide is mainly made of nano-titanium dioxide solvent-based colloid and nano-titanium dioxide solid powder, but nano-titanium dioxide solvent-based colloid has poor stability, organic solvents are volatile, difficult to store, and easy to pollute the air, poor environmental protection; and nano-titanium dioxide solid powder is difficult to disperse , easy to reunite, there are three wastes pollution during preparation, not environmentally friendly
[0003] At present, there are also patent applications for the preparation method of nano-scale titanium dioxide hydrocolloid, such as the patent No. 200710065655.7, and the Chinese patent titled "A Preparation Method of Nano-Anatase Titanium Dioxide Hydrocolloid". This method requires the addition of diethanolamine, three Organic compounds such as ethanolamine and organic compounds such as ethylenediamine and acetylacetone, resulting in more types of raw materials and complicated process
Another example is that the patent number is 200610039319.0, and the patent name is "Preparation method of anatase-type titanium dioxide hydrosol". In this method, the main raw material is titanium tetrachloride, but the process is "hydrolysis-organic extraction-inorganic stripping". The process is more complicated and requires more equipment

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  • Preparation method of aqueous nano-TiO2 colloid
  • Preparation method of aqueous nano-TiO2 colloid

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preparation example Construction

[0013] A preparation method of nano-titanium dioxide hydrocolloid, comprising the following steps: a, supply of raw materials: select titanate, inorganic acid and deionized water as raw materials, prepare a temperature-controlled water bath device, wherein the main raw material of titanate can be titanium Any one of ethyl titanate, propyl titanate or butyl titanate, the inorganic acid can be any one of hydrochloric acid, sulfuric acid or nitric acid, and deionized water is used as the medium, also known as pure water;

[0014] b. Hydrolysis: first pour deionized water into a temperature-controlled water bath device, then add titanate into deionized water, the molar ratio of titanate to deionized water is 1:70-120, and Stir while adding, so that the titanate is completely hydrolyzed into titanium hydroxide;

[0015] c, acidification: add inorganic acid in the obtained titanium hydroxide hydrolyzate, the mol ratio of titanium hydroxide and inorganic acid is 1: 0.2~0.8, makes the...

Embodiment 1

[0019] Ethyl titanate was added into pure water under stirring to completely hydrolyze it into titanium hydroxide. Then add hydrochloric acid to make the pH value of the hydrolyzate around 3, and stir at normal temperature and pressure for 20 minutes. Heating in a water bath to make the temperature of the hydrolyzate reach about 60°C, stirring and reacting at constant temperature and normal pressure for 8 hours, at this time, the titanium hydroxide precipitate gradually dissolves and gels into a water sol. The molar ratio of ethyl titanate, water, and hydrochloric acid is 1:70:0.2.

Embodiment 2

[0021] Propyl titanate was added into pure water under stirring to completely hydrolyze it into titanium hydroxide. Then add sulfuric acid to make the pH value of the hydrolyzate around 2, and stir for 20 minutes at normal temperature and pressure. Heating in a water bath to make the temperature of the hydrolyzate reach about 80°C, stirring and reacting at constant temperature and normal pressure for 6 hours, at this time, the titanium hydroxide precipitate gradually dissolves and gels into a water sol. The molar ratio of propyl titanate, water and sulfuric acid is 1:90:0.8.

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Abstract

The invention discloses a preparation method of an aqueous nano-TiO2 colloid. The preparation method comprises the following steps: dumping deionized water to a temperature-controlled water bath device, adding a titanate to the deionized water, and stirring while adding under normal temperature and normal pressure conditions to completely hydrolyze the titanate to titanium hydroxide; adding an inorganic acid to the prepared titanium hydroxide hydrolysate to make the pH value of the titanium hydroxide hydrolysate be 1-4; and heating the temperature-controlled water bath device to make precipitated titanium hydroxide be gradually dissolved and gel to a hydrosol with a -O-Ti-O- structure. The preparation method of the aqueous nano-TiO2 colloid has the advantages of very simple process and very simple production equipment, and the colloid has the characteristics of very low production cost, extremely easy industrialized production, and high crystallization degree, and is a 100% anatase phase; and particle sizes are less than 15nm, and the colloid of the invention has the advantages of good repeatability, good stability, environmental protection, no pollution, no deterioration because of realization of long term storage, realization of arbitrary concentration or dilution with water, good coating capability and film forming capability, and strong photocatalytic activity.

Description

Technical field: [0001] The invention relates to a method for preparing a hydrocolloid, in particular to a method for preparing a nanometer titanium dioxide hydrocolloid. Background technique: [0002] Nano-titanium dioxide is a white loose powder with strong ultraviolet shielding effect and good weather resistance; it can be used in the fields of cosmetics, functional fibers, plastics, coatings, paints, etc., as an ultraviolet shielding agent to prevent ultraviolet rays, and can also be used in high-end cars Topcoat with flop effect. At present, nano-titanium dioxide is mainly made of nano-titanium dioxide solvent-based colloid and nano-titanium dioxide solid powder, but nano-titanium dioxide solvent-based colloid has poor stability, organic solvents are volatile, difficult to store, and easy to pollute the air, poor environmental protection; and nano-titanium dioxide solid powder is difficult to disperse , easy to reunite, there are three wastes pollution during preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y40/00
Inventor 童晶程黎放童惠君
Owner 江苏恒智纳米科技有限公司
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