Method for preparing anti-ultraviolet nano zinc oxide composite powder

Abstract

The invention relates to a manufacture method for an anti-ultraviolet nanometer zinc oxide compound powder. It includes the following steps: mixing nanometer zinc oxide powder with dispersing agent, and deionized water; using silicate as raw material, by controlling the pH value of reacting liquid, taking silicon dioxide surface modification; taking organic modification to the surface, after washing and drying, the nanometer zinc oxide compound powder would be gained. The invention has the advantages of simple technology, low cost, strong repeatability, etc. It has bright application prospect.

Description

technical field [0001] The invention relates to a preparation method of an anti-ultraviolet nano-zinc oxide composite powder, which belongs to the technical field of preparation technology of an anti-ultraviolet inorganic-organic composite powder material. Background technique [0002] As we all know, nano-zinc oxide, titanium dioxide, and red iron oxide can all be used as inorganic compounds for ultraviolet shielding agents; especially nano-zinc oxide, because it is white in itself, simple in coloring, and has strong ability to absorb ultraviolet rays, it is effective against UVA, UB and UVC. Shielding effect, and thus widely used. In addition, nano-zinc oxide is also an excellent anti-aging agent to significantly improve the aging resistance of coatings, paints, fibers, and films. It is a potential anti-ultraviolet aging agent. [0003] However, the nano-zinc oxide particles have high surface energy, are in a thermodynamically unstable state, and are prone to agglomeratio...

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Problems solved by technology

[0005] U.S. Patent No. 5,486,631 discloses a method for organosilicon-poly-nano-zinc oxide, which obtains a stable, lipophilic composite powder. However, the method uses a single substance to coat the composite powder. Strong, which limits its scope of use, and the process is also more complicated

[0006] Chinese patent CN1398923, which discloses a modified ultrafine zinc oxide and its preparation method, wherein the modified ultrafine zinc oxide is added in the process of distilling ammonia produced by the alkaline method or after the zinc oxide is produced. Modified ultrafine zinc oxide can be obtained by using a new polymer dispersant, or a coupling agent with an amphoteric structure, but it is coated with a single substance, which limits the actual application effect of zinc oxide

[0007] Chinese patent CN1260366, the patent reported the use of ultrasonic microemulsion method to prepare nano-zinc oxide ultraviolet shielding material, which is made by modifying the surface of nano-zinc oxide doped with magnesium oxide and coated with non-ionic surfactant. Emulsion method, high cost, difficult to mass-produce

But it is difficult to disperse evenly in lipophilic matrix

[0010] Chinese patent CN1659223A discloses a preparation method of zinc oxide fine particle powder coated with silicon dioxide containing surface Zengshui, wherein the average primary particle size of the powder is 5-120nm, and the particle size range is too wide, so it is difficult to determine the optimal particle size during use. particle size; in addition, organic solvents such as tetramethoxy and tetraethoxysilane are used to produce silicic acid, which is costly and easy to pollute

[0011] Most of the above-mentioned methods are costly and difficult to promote in large-scale industrialization; most of these methods are coated with a single substance, which cannot satisfy the stability and compatibility of nano-zinc oxide with the oily matrix of cosmetics, paints, paints, fibers, films and other materials.