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CN-121975367-A - Nano silver alumina composite particles, antibacterial cover plate, preparation method and application thereof

CN121975367ACN 121975367 ACN121975367 ACN 121975367ACN-121975367-A

Abstract

The application relates to the technical field of nano composite materials, in particular to nano silver-alumina composite particles, an antibacterial cover plate, a preparation method and application thereof. The nano silver aluminum oxide composite particles are prepared from aluminum salt, tetramethyl ammonium hydroxide, ammonia water, silver nitrate, gelatin, tea polyphenol and a mixed solvent through a specific process, and a load type structure that nano silver particles are loaded on an aluminum oxide carrier is formed. The composite particles, polyimide varnish, silane coupling agent, plasticizer, defoamer and solvent are prepared into coating slurry according to a specific proportion, and an antibacterial cover plate with long-acting antibacterial property, high hardness, high light transmittance and excellent durability can be prepared through a step heating curing procedure.

Inventors

  • JIN SHIDONG
  • PENG LIMING

Assignees

  • 深圳市华科创智技术股份有限公司

Dates

Publication Date
20260505
Application Date
20260121

Claims (10)

  1. 1. The nano silver alumina composite particle is characterized by comprising, by weight, 5-10 parts of aluminum salt, 2-5 parts of tetramethylammonium hydroxide, 1-3 parts of ammonia water, 5-10 parts of silver nitrate, 1-5 parts of gelatin, 0.5-2.5 parts of tea polyphenol and 64.5-85.5 parts of mixed solvent.
  2. 2. The nano-silver alumina composite particle according to claim 1, wherein the aluminum salt is at least one of aluminum nitrate, aluminum chloride, aluminum sulfate.
  3. 3. The nano-silver alumina composite particles according to claim 1, wherein the mixed solvent is composed of at least two of absolute ethyl alcohol, n-hexane and deionized water.
  4. 4. A method for preparing the nano-silver alumina composite particles according to any one of claims 1 to 3, comprising the steps of: s11, mixing the aluminum salt, tetramethyl ammonium hydroxide, ammonia water and a first solvent, stirring and heating for reaction, and then carrying out solid-liquid separation and drying to obtain nano alumina particles; S12, mixing the gelatin, tea polyphenol and a second solvent, adding the silver nitrate for heating reaction, then adding the nano-alumina particles for carrying reaction, and carrying out aftertreatment after the reaction is finished to obtain the nano-silver alumina composite particles, wherein the first solvent and the second solvent form the mixed solvent together.
  5. 5. The preparation method according to claim 4, wherein in the step S11, the amount of the tetramethylammonium hydroxide added is 3 to 4 parts by weight, and the hydrolysis time of the heating reaction is 3 to 4 hours.
  6. 6. An antibacterial cover plate is characterized by comprising, by weight, 70-90 parts of polyimide varnish, 0.01-0.1 part of nano silver alumina composite particles according to any one of claims 1-3, 0.1-5 parts of silane coupling agent, 0.1-3 parts of plasticizer, 0.1-0.3 part of defoaming agent and 10-20 parts of solvent.
  7. 7. The antimicrobial cover of claim 6, wherein the solvent is at least one of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide, and γ -butyrolactone.
  8. 8. A method of manufacturing an antimicrobial cover sheet according to claim 6 or 7, comprising the steps of: S21, mixing the nano silver-alumina composite particles, a silane coupling agent and part of the solvent, and performing ultrasonic pretreatment to obtain a pre-dispersion liquid; s22, mixing the pre-dispersion liquid, polyimide varnish, plasticizer, defoamer and solvent, and uniformly stirring to obtain coating slurry; S23, coating the coating slurry on a substrate, solidifying through a step heating program, demolding and drying to obtain the antibacterial cover plate.
  9. 9. The method according to claim 8, wherein in step S23, the step-heating procedure is to cure at 80-90 ℃ for 0.5-1 hour, then to cure at 120-130 ℃, 150-160 ℃, 200-220 ℃ for 0.5-1 hour, and finally to cure at 240-260 ℃ for 1-2 hours.
  10. 10. Use of an antimicrobial cover according to claim 6 or 7 in a protective cover for electronic devices.

Description

Nano silver alumina composite particles, antibacterial cover plate, preparation method and application thereof Technical Field The invention relates to the technical field of nano composite materials, in particular to nano silver-alumina composite particles, an antibacterial cover plate, a preparation method and application thereof. Background The cover plate surface of electronic equipment such as a smart phone and a tablet personal computer is the most frequent area contacted by a user, and pathogenic microorganisms such as escherichia coli, staphylococcus aureus and the like are easy to breed and adhere, so that potential health hazards are brought. For this reason, it is an important requirement to impart an antibacterial function to the cover sheet. In the prior art, a mode of coating a coating containing an antibacterial agent such as nano silver on the surface of a cover plate or directly blending the antibacterial agent into matrix resin is often adopted. However, the surface coating has the problems of poor adhesion, poor friction resistance and easy falling off, so that the antibacterial failure is caused. The nano silver is simply blended, and due to extremely high surface energy, the nano silver is easy to agglomerate in a resin matrix, so that the optical uniformity of the material is affected (the haze is increased), the nano silver is weakly combined with the matrix, silver ions are released too quickly and uncontrollably, the nano silver is often attenuated quickly after the nano silver shows high antibacterial property at the initial stage, and long-acting antibacterial property cannot be realized. In addition, inorganic fillers such as alumina and silica are usually required to be added to improve the surface hardness of the cover plate, but the light transmittance is often damaged by increasing the amount of the fillers, and the technical problem of realizing high hardness and long-acting antibacterial performance while ensuring high light transmittance is currently faced. Therefore, the antibacterial function of the cover plate of the electronic equipment in the prior art mainly faces two key contradictions, namely the contradiction between the optical performance reduction caused by nano silver agglomeration and the non-lasting antibacterial performance caused by too fast silver ion release, and the contradiction between the hardness improvement by adding inorganic filler and the material transmittance damage caused by filler. How to develop a cover plate material which can realize long-acting antibiosis, high hardness, high light transmittance and excellent durability at the same time is a technical problem to be solved in the field. Disclosure of Invention The invention aims to overcome the defects that an electronic equipment cover plate in the prior art is not durable in antibacterial effect, poor in wear resistance and difficult to consider optical and mechanical properties, and provides nano silver-alumina composite particles, an antibacterial cover plate, a preparation method and application thereof. In order to achieve the above purpose, the application adopts the following technical scheme: The application provides nano silver aluminum oxide composite particles, which are characterized by comprising, by weight, 5-10 parts of aluminum salt, 2-5 parts of tetramethylammonium hydroxide, 1-3 parts of ammonia water, 5-10 parts of silver nitrate, 1-5 parts of gelatin, 0.5-2.5 parts of tea polyphenol and 64.5-85.5 parts of mixed solvent. The nano silver alumina composite particles are supported structures formed by loading nano silver particles on the surfaces of the nano alumina particles, the nano silver particles are uniformly anchored on the surfaces of the nano alumina carriers in a fine nano size, and the nano silver particles and the nano alumina carrier are firmly combined through bridging and reduction effects of gelatin and tea polyphenol. Further, the amount of the tetramethylammonium hydroxide is 3-4 parts by weight. Further, the aluminum salt is at least one of aluminum nitrate, aluminum chloride and aluminum sulfate. Further, the mixed solvent is preferably composed of at least two of absolute ethyl alcohol, n-hexane and deionized water. In a second aspect, the application provides a preparation method of the nano silver alumina composite particles, which comprises the following steps: s11, mixing the aluminum salt, tetramethyl ammonium hydroxide, ammonia water and a first solvent, stirring and heating for reaction, and then carrying out solid-liquid separation and drying to obtain nano alumina particles; s12, mixing the gelatin, tea polyphenol and a second solvent, adding the silver nitrate for heating reaction, then adding the nano-alumina particles for carrying reaction, and carrying out aftertreatment after the reaction is finished to obtain the nano-silver alumina composite particles, wherein the first solvent and the second solvent are used together as the mixed sol