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Process for producing nano-titanium dioxide-zinc oxide composite powder

A technology of nano-titanium dioxide and composite powder, which is applied in the direction of fibrous fillers, etc., can solve the problems of complex process, complicated operation, and growth of nano-particles, and achieve the effects of high transmittance of visible light, increased filtration speed, and excellent shielding performance

Active Publication Date: 2011-08-10
江苏河海纳米科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will cause the following problems in sunscreen cosmetics: (1) complex process and troublesome operation; (2) agglomeration and flocculation of the system due to compatibility reasons and differences in surface properties
The disadvantages of this method are: (1) The titanium dioxide precursor produced by ball milling is a complex with an amorphous structure, which requires high-temperature calcination to have nano-titanium dioxide with a crystal structure
In particular, it needs to be calcined at a high temperature of 750-900°C to prepare rutile nano-titanium dioxide, which will inevitably cause the growth of nanoparticles and serious agglomeration; (2) the ball milling process is labor-intensive and complicated to operate, which is not convenient for industrialization and automation Production
The patent application with publication number CN101036886A discloses a preparation method of mesoporous titanium dioxide and zinc oxide with large specific surface area, but this method needs to consume acrylic acid and alcohol, resulting in high product cost and pollution to the environment

Method used

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  • Process for producing nano-titanium dioxide-zinc oxide composite powder

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Experimental program
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Effect test

Embodiment 1

[0023] Control the reaction temperature at 50°C, and while stirring, add 2mol·L -1 Slowly add 1mol·L dropwise to the NaOH aqueous solution -1 Titanium tetrachloride aqueous solution, when the pH value of the system is 8.0, stop dripping the titanium tetrachloride aqueous solution, and react to generate amorphous titanium dioxide hydrate. The titanium dioxide hydrate was filtered and washed to remove soluble salts. Redisperse the titanium dioxide hydrate filter cake in deionized water, add concentrated hydrochloric acid solution to the hydrogen ion (H + ) concentration is 0.1mol L -1 , the temperature was raised to 90° C., and the crystallization treatment was carried out at 90° C. for 10 hours to obtain a rutile nano-titanium dioxide aqueous dispersion. Adjust the solid content of the nano-titanium dioxide aqueous dispersion to 3%, and maintain the reaction temperature at 90°C, add a concentration of 3.0mol L to the nano-titanium dioxide aqueous dispersion -1 zinc nitrate ...

Embodiment 2

[0025] Control the reaction temperature at 50°C, and while stirring, add 2mol·L -1Slowly add 1mol·L dropwise to the NaOH aqueous solution -1 Titanium tetrachloride aqueous solution, when the pH value of the system is 8.0, stop dripping the titanium tetrachloride aqueous solution, and react to generate amorphous titanium dioxide hydrate. The titanium dioxide hydrate was filtered and washed to remove soluble salts. Redisperse the titanium dioxide hydrate filter cake in deionized water, add 1mol L -1 hydrochloric acid solution until the pH value of the system is 6.0, the temperature is raised to 200°C, and the crystallization treatment is carried out at 200°C for 24 hours to obtain an anatase nano-titanium dioxide aqueous dispersion. Adjust the solid content of the nano-titanium dioxide aqueous dispersion to 10%, adjust the system temperature to 30°C, and add a concentration of 0.5mol L to the nano-titanium dioxide aqueous dispersion. -1 zinc chloride aqueous solution, the amo...

Embodiment 3

[0027] Control the reaction temperature at 15°C, and while stirring, increase to 2mol·L -1 Slowly add 1mol·L dropwise to the NaOH aqueous solution -1 Titanium tetrachloride aqueous solution, when the pH value of the system is 0.5, stop adding the titanium tetrachloride aqueous solution dropwise, raise the temperature to 85°C, and heat-preserve and crystallize at 85°C for 2 hours to obtain rutile and anatase Mixed crystal nano titanium dioxide aqueous dispersion. Adjust the solid content of the nano-titanium dioxide aqueous dispersion to 8%, and adjust the reaction temperature to 70°C, and add a concentration of 1.5mol L to the nano-titanium dioxide aqueous dispersion. -1 zinc sulfate aqueous solution, the amount of zinc sulfate is based on the mass of ZnO, accounting for 200% of the quality of nano-titanium dioxide; -1 ammonium carbonate aqueous solution, until the pH value of the mixed solution is 7.5, and continue to stir for 90min to prepare a mixed slurry of nano-titaniu...

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Abstract

The invention relates to a method for preparing an inorganic ultraviolet screening agent, in particular to a method for preparing a nanometer titania-zinc oxide composite powder body and belongs to the technical field of nanometer material. The method for preparing the nanometer titania-zinc oxide composite powder body comprises the following steps: a zinc salt aqueous solution and a carbonate aqueous solution are added into a nanometer titania aqueous dispersion solution respectively; alkali zinc carbonate is deposited between nanometer titania particles through a chemical sedimentation method; and the alkali zinc carbonate is subjected to thermal decomposition through heat treatment, produces mass nanometer zinc oxide between the nanometer titania particles and simultaneously produces carbon dioxide gas through calcination so as to separate the nanometer particles and achieve the aim of preventing agglomeration. The method has the characteristics of short process flow, convenient operation, low cost and easy control. The titania-zinc oxide composite powder body prepared through the method has the characteristics of good dispersibility, excellent screening performance on UVA and UVB and high permeability of visible light.

Description

technical field [0001] The invention relates to a preparation method of an inorganic ultraviolet shielding agent, in particular to a preparation method of nano titanium dioxide-zinc oxide composite powder, belonging to the technical field of nanometer materials. Background technique [0002] In the light radiated by the sun, there are about 5% ultraviolet rays with a wavelength ≤ 400nm. The ultraviolet rays in sunlight can be divided according to their wavelengths: long-wave ultraviolet UVA with a wavelength of 320-400nm, medium-wave ultraviolet UVB with a wavelength of 290-320nm, and short-wave ultraviolet UVC with a wavelength of 200-290nm. UVB is the main cause of skin inflammation and sunburn. Research results in recent years have proved that although UVA, which accounts for 91% of the sun's ultraviolet rays, does not cause as intense a reaction as UVB, it has a strong penetrating power, and 35-50% of it can reach the dermis, causing damage to the fibrous tissue in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C1/04
Inventor 姚超成庆堂徐斌海吴凤芹方志成李为民张磊
Owner 江苏河海纳米科技股份有限公司
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