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CN-121974384-A - Modified flaky zinc oxide and preparation method thereof

CN121974384ACN 121974384 ACN121974384 ACN 121974384ACN-121974384-A

Abstract

The invention belongs to the field of inorganic sunscreens, and in particular relates to a flaky nano zinc oxide and a preparation method thereof, wherein the diameter is 100-150 nanometers, and the thickness is 10-20 nanometers. The preparation method comprises the steps of adding a surfactant into zinc salt, and carrying out two reactions with a precipitant and alkali liquor as the sequence. The method can control the size and the morphology of zinc oxide particles, and the synthesized zinc oxide has excellent dispersibility.

Inventors

  • CHEN LINGLING
  • ZHOU BIN
  • SUN SHIQIANG

Assignees

  • 辽宁蓝恩氢能源环保科技有限公司

Dates

Publication Date
20260505
Application Date
20260206

Claims (9)

  1. 1. A modified flaky zinc oxide is characterized in that the nanometer zinc oxide is flaky, the diameter is 100-150 nanometers, and the thickness is 10-20 nanometers.
  2. 2. The method for preparing the modified flaky zinc oxide as claimed in claim 1, comprising the steps of: Step 1, preparing zinc salt solution, namely adding zinc salt and surfactant into deionized water to prepare mixed zinc salt solution, wherein the concentration of the zinc salt is 0.1-0.5mol/L, the concentration of the surfactant is 0.001-0.005mol/L, and the temperature is raised to 60-80 ℃, preparing precipitant, namely adding precipitant into the deionized water to dissolve the precipitant, preparing precipitant solution with the concentration of 0.05-0.1mol/L, preparing alkali liquor, namely adding alkaline substances into the deionized water to dissolve the precipitant solution, and preparing alkali liquor solution with the concentration of 0.2-1.0 mol/L; step 2, dropwise adding the precipitant solution into the zinc salt mixed solution, uniformly mixing, filtering at 150-200 ℃ for 6-8 hours, washing with deionized water, and drying to obtain a nano zinc oxide precursor; And 3, dispersing the nano zinc oxide precursor in the step 2 in deionized water, adding a surfactant, dripping alkali liquor into the nano zinc oxide precursor solution, uniformly mixing, filtering, washing with deionized water, washing with alcohol, drying and roasting at 150-200 ℃ for 6-8 hours to obtain the product nano zinc oxide.
  3. 3. The method of claim 2, wherein the zinc salt is one or more of zinc chloride, zinc sulfate and zinc acetate.
  4. 4. The method of claim 2, wherein the surfactant is one or more of triethanolamine, sodium stearate, polyacrylic acid, polyethylene glycol, and lauryl alcohol.
  5. 5. The method of claim 2, wherein the precipitating agent is one or more of sodium carbonate, potassium carbonate, calcium carbonate and ammonium carbonate.
  6. 6. The method of claim 2, wherein the alkaline substance is one or more of sodium hydroxide, potassium hydroxide, ammonia water and calcium hydroxide.
  7. 7. The method of claim 2, wherein the alcohol is one or more of methanol, ethanol, tert-butanol, and ethylene glycol.
  8. 8. The method of claim 2, wherein in step 2, the aging is performed at 150 to 200℃for 6 to 8 hours, and in step 3, the aging is performed at 150 to 200℃for 6 to 8 hours.
  9. 9. Use of a modified platelet-shaped zinc oxide as claimed in claim 1 as a sunscreen and/or antibacterial agent for the preparation of cosmetics.

Description

Modified flaky zinc oxide and preparation method thereof Technical Field The invention belongs to the technical field of preparation of cosmetic raw materials, and particularly relates to a flaky nano zinc oxide and a preparation method thereof. Technical Field The nano zinc oxide can be used as a sun-screening agent and an antibacterial agent in cosmetics, is nontoxic, odorless, has no irritation to skin, does not decompose or deteriorate, has good thermal stability, is colorless, can be simply colored, has low price, has good blocking rate and protective effect on ultraviolet UVA and UVB, and is widely used. Because of these characteristics of zinc oxide powder, it is often used as an inorganic ultraviolet screening agent in the cosmetic industry to achieve a sun protection effect for functional cosmetics. The existing flaky zinc oxide has the defects that the surface energy is relatively large, agglomeration phenomenon is easy to occur, the agglomeration particles are difficult to disperse in cosmetics, the agglomerated particles are unevenly distributed in a final product, whitening and thick feel are easy to occur after the application, and the user experience is influenced. Agglomeration may be aggravated in long-term storage, delamination and precipitation may be caused, and in order to inhibit agglomeration, a large amount of surfactants such as silicone oil, polydimethylsiloxane, and dispersants such as polyvinylpyrrolidone or ultrasonic treatment may be added during preparation in the prior art, so that the shelf life of the product is shortened (the system is required to be kept stable by relying on a thickener or a suspending agent), and the complexity and cost of the formulation are increased. In order to improve the dispersibility and biocompatibility, the nano ZnO is often subjected to surface modification such as SiO 2 coating, polymer grafting and silane coupling agent treatment, but the nano ZnO introduces new problems that firstly, the modification process is complicated, additional chemical reaction steps such as hydrolysis and grafting are required to increase the preparation period and equipment investment, and secondly, the second potential compatibility conflicts that the modification layer such as organic silicon and polymer can interact with other components of cosmetics such as emulsifying agents and active substances, so that the mud rubbing effect is reduced, and the ultraviolet absorption of ZnO is blocked by the modification layer. Disclosure of Invention The invention provides a preparation method of flaky nano zinc oxide aiming at the problems. The technical scheme of the invention is that the modified flaky zinc oxide is flaky, the diameter of the nanometer zinc oxide is 100-150 nanometers, and the thickness of the nanometer zinc oxide is 10-20 nanometers. The preparation method of the modified flaky nano zinc oxide comprises the following steps: Step 1, preparing zinc salt solution, namely adding zinc salt and surfactant into deionized water to prepare mixed zinc salt solution, wherein the concentration of the zinc salt is 0.1-0.5mol/L, the concentration of the surfactant is 0.001-0.005mol/L, and the temperature is raised to 60-80 ℃, preparing precipitant, namely adding precipitant into the deionized water to dissolve the precipitant, preparing precipitant solution with the concentration of 0.05-0.1mol/L, preparing alkali liquor, namely adding alkaline substances into the deionized water to dissolve the precipitant solution, and preparing alkali liquor solution with the concentration of 0.2-1.0 mol/L; step 2, dropwise adding the precipitant solution into the zinc salt mixed solution, uniformly mixing, filtering at 150-200 ℃ for 6-8 hours, washing with deionized water, and drying to obtain a nano zinc oxide precursor; And 3, dispersing the nano zinc oxide precursor in the step 2 in deionized water, adding a surfactant, dripping alkali liquor into the nano zinc oxide precursor solution, uniformly mixing, filtering, washing with deionized water, washing with alcohol, drying and roasting at 150-200 ℃ for 6-8 hours to obtain the product nano zinc oxide. According to the preparation method, the zinc salt is one or more of zinc chloride, zinc sulfate and zinc acetate. According to the preparation method, the surfactant is one or more of triethanolamine, sodium stearate, polyacrylic acid, polyethylene glycol and lauryl alcohol. According to the preparation method, the precipitant is one or more of sodium carbonate, potassium carbonate, calcium carbonate and ammonium carbonate. In the preparation method, the alkaline substance is one or more of sodium hydroxide, potassium hydroxide, ammonia water and calcium hydroxide. The alcohol-washed alcohol is one or more of methanol, ethanol, tertiary butanol and glycol. In the preparation method, in the step 2, the aging is performed for 6-8 hours at 150-200 ℃, and in the step 3, the aging is performed for 6-8 hours at 150-200 ℃. The applica