Preparation method for modified transparent nano-zinc oxide sol

A nano-zinc oxide and zinc oxide technology, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology, etc., can solve the problems that the transparency of the dispersion cannot be achieved, and achieve the effects of good crystallization, high purity, and convenient operation

Inactive Publication Date: 2013-06-19
贵州省纳米材料工程中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 7,348,029 uses polyethylene glycol acid or its oligomers as a surface modifier to modify nano-zinc oxide powder to prepare an aqueous dispersion, but the transparency of the dispersion cannot be realized, which is different from the present invention. different content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Heat and dissolve 68g of zinc chloride in 500g of ethylene glycol to make about 1mol / L transparent zinc chloride ethylene glycol solution. It is also said that 40g of sodium hydroxide is heated and dissolved in 500g of ethylene glycol to form a transparent sodium hydroxide ethylene glycol solution of about 2mol / L. Then the mol ratio of zinc to alkali is 1: 1.5, under stirring, pour sodium hydroxide solution into zinc chloride solution, continue to stir for 30 minutes, obtain pH value ~ 9 containing zinc hydroxide flocculent precipitate Neutralizing solution. Heating the neutralizing solution at 95° C. for 2 hours can obtain a transparent nano-zinc oxide sol, and at this time, the zinc oxide content is ~3.5 wt%.

[0020] Take 200g of transparent sol, adjust the pH value to ~8 with alkali polyol solution, weigh 2g of isopropoxytri(dioctyl phosphate) titanate, add it, stir at room temperature for 2 hours, then add 30g of aqueous isopropanol Solution (the mass ratio of wa...

Embodiment 2

[0022] Heat and dissolve 136g of zinc chloride dihydrate in 500g of ethylene glycol to obtain about 2mol / L transparent zinc chloride ethylene glycol solution. Another name is 80g sodium hydroxide, add 1000g ethylene glycol, heat and stir to dissolve, and prepare about 2mol / L transparent sodium hydroxide ethylene glycol solution. Then the mol ratio of zinc to alkali is 1: 1.8, under the stirring situation, the zinc chloride solution is poured into the sodium hydroxide solution, and the stirring is continued for 30 minutes to obtain a pH value~10 containing zinc hydroxide flocculent precipitate. Neutralizing solution. Heating the neutralizing solution at 95° C. for 2 hours can obtain a transparent crystalline nanometer zinc oxide sol, at which time the zinc oxide content is ~5 wt%.

[0023]Take 200g of the transparent sol, weigh 3g of γ-glycidyl ether propyl trimethoxysilane coupling agent, dissolve it with 12g of aqueous ethanol solution (containing 1g of water), then slowly a...

Embodiment 3

[0025] Heat and dissolve 68g of zinc chloride in 500g of ethylene glycol to make about 1mol / L transparent zinc chloride ethylene glycol solution. It is also said that 40g of sodium hydroxide is heated and dissolved in 500g of ethylene glycol to form a transparent sodium hydroxide ethylene glycol solution of about 2mol / L. Then the mol ratio of zinc to alkali is 1: 1.8, under the stirring situation, the sodium hydroxide solution is poured into the zinc chloride solution, and the stirring is continued for 30 minutes to obtain a pH value~10 containing zinc hydroxide flocculent precipitate. Neutralizing solution. Heating the neutralizing solution at 95° C. for 2 hours can obtain a transparent nano-zinc oxide sol, at which time the zinc oxide content is ~3.8 wt%.

[0026] Take 200g of transparent sol, add 2.28g of gamma-glycidyl ether propyl trimethoxysilane coupling agent, stir at room temperature for 1.5 hours, then add 30g of aqueous isopropanol solution (the mass ratio of water...

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Abstract

The invention relates to a preparation method for modified transparent nano-zinc oxide sol. The method comprises the following steps: according a mol ratio of zinc to an alkali of 1: 1-2, directly mixing a zinc salt dissolved in polyol and the alkali dissolved in polyol for a reaction so as to produce a white zinc hydroxide flock mixed solution and heating and aging the obtained zinc hydroxide solution so as to obtain transparent sol; and using a surface modifier for surface modification of the nanometer zinc oxide sol in a polyol system, carrying out water flocculation, cleaning and separation to obtain a deposit and re-dispersing the deposit in a frequently used polar or non-polar organic solvent to form the transparent nano-zinc oxide with high purity. The method provided by the invention has the advantages of easiness, low energy consumption and convenient operation; the obtained crystalline zinc oxide sol has the characteristics of high transparency, high purity, a small particle size and good homogeneity; and large scale industrial production of the modified transparent nano-zinc oxide sol can be realized.

Description

technical field [0001] The invention relates to a method for preparing a modified nano-zinc oxide transparent sol, in particular to preparing a high-transparency nano-zinc oxide sol by using a chemical synthesis method and a chemical surface modification method. Background technique [0002] Nano zinc oxide refers to zinc oxide particles with a grain size below 100nm. Due to the small particle size, large specific surface area, surface effect, small size effect and macroscopic quantum tunnel effect, etc., it exhibits many special physical, chemical, surface and interface properties. It is used in rubber, coatings, inks, pigments, and catalysts. , high-end cosmetics, solar cells and medicine and other fields have shown broad application prospects. However, due to the polarity of nano-zinc oxide itself and the miniaturization of particles, it has a large specific surface area and high specific surface energy, making them easier to agglomerate and difficult to disperse well in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y40/00
Inventor 仇伟曾舒刘见祥朱艳
Owner 贵州省纳米材料工程中心
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