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CN-121975452-A - Composite particles, method for the production thereof and use thereof

CN121975452ACN 121975452 ACN121975452 ACN 121975452ACN-121975452-A

Abstract

The application provides a composite particle, a preparation method and application thereof. The composite particle comprises porous inorganic oxide particles and an antioxidant positioned in the porous inorganic oxide particles, wherein the surfaces of the inorganic oxide particles are coated with polymer shells, the polymer shells are products of click polymerization of silane molecules with mercapto groups, thermally responsive vinyl monomers and non-thermally responsive vinyl monomers, the silane molecules with the mercapto groups are connected with surface chemical bonds of the inorganic oxide particles, and when the composite particle is heated, the polymer shells shrink to expose the porous inorganic oxide particles. The composite particles are applied to the QD-LED packaging body, so that the oxidation resistance, the service life and the optical performance of the device are obviously improved.

Inventors

  • YU JIANXING
  • BAI JUN
  • QIU MINGLIANG
  • YANG RENWEI

Assignees

  • 纳晶科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260126

Claims (10)

  1. 1. A composite particle is characterized by comprising inorganic oxide particles with a porous structure and an antioxidant positioned in the porous structure, wherein the surfaces of the inorganic oxide particles are coated with a polymer shell, the polymer shell is made of a product of click polymerization of silane molecules with mercapto groups, thermally responsive vinyl monomers and non-thermally responsive vinyl monomers, the silane molecules with the mercapto groups are connected with the surface chemical bonds of the inorganic oxide particles, and when the composite particle is heated, the polymer shell groups shrink to expose the porous structure.
  2. 2. The composite particle of claim 1, wherein the thermally responsive vinyl monomer is selected from one or more of N-isopropylacrylamide, N-diethylacrylamide, 2- (dimethylamino) ethyl methacrylate, 2- (diethylamino) ethyl methacrylate, 2-methyl-2-propenoic acid-2- (2-methoxyethoxy) ethyl ester.
  3. 3. The composite particle according to claim 1, wherein the average diameter of the inorganic oxide particles is 20-5000 nm and the pore diameter is more than 2 nm. Preferably, the inorganic oxide is at least one selected from the group consisting of silica, alumina, zinc oxide and zirconia.
  4. 4. The composite particle according to claim 1, wherein the non-thermally responsive vinyl monomer is at least one selected from the group consisting of methyl methacrylate, styrene, octadecyl methacrylate, cyclohexyl methacrylate, n-butyl methacrylate, isobornyl acrylate, methyl acrylate, lauryl methacrylate, ethyl acrylate, vinyl acetate, butyl acrylate, and isooctyl acrylate.
  5. 5. The composite particle according to claim 1, wherein the antioxidant comprises P, S or N element, preferably the antioxidant is selected from one or more of hindered phenols, hindered amines, phosphites, thioesters or thioethers, preferably the antioxidant is 0.1-20% of the mass of the inorganic oxide particles.
  6. 6. The composite particle according to claim 1, wherein the mass of the thermally responsive vinyl monomer and the mass of the non-thermally responsive vinyl monomer independently account for 0.5 to 15% of the mass of the inorganic oxide particles.
  7. 7. The method for preparing composite particles according to any one of claims 1 to 6, wherein the method comprises the steps of S1 preparing a mixture of a dispersion of inorganic oxide particles and a silane coupling agent having mercapto groups in a container, uniformly mixing the mixture so that the silane coupling agent and surface hydroxyl groups of the inorganic oxide particles are condensed to obtain silane molecules having mercapto groups, S2 adding the thermally responsive vinyl monomer, the non-thermally responsive vinyl monomer and an initiator in the container, heating the mixture so that click polymerization occurs, S3 maintaining a certain temperature after the polymerization reaction is completed, adding the antioxidant in the container and uniformly mixing the antioxidant so that the antioxidant is adsorbed into the pores, and S4 rapidly cooling the mixture to room temperature after the adsorption is completed, and finally separating, purifying and drying the mixture to obtain the composite particles.
  8. 8. The method for producing composite particles according to claim 7, wherein the silane coupling agent having a mercapto group is at least one selected from the group consisting of 3-mercaptopropyl (dimethoxy) monosilane, (3-mercaptopropyl) triethoxysilane, (3-mercaptopropyl) trimethoxysilane, 2-mercaptoethyltriethoxysilane and 11-mercaptoundecyltrimethoxysilane.
  9. 9. A quantum dot composition comprising the composite particle of any one of claims 1 to 6, quantum dots and UV curable glue.
  10. 10. An LED package comprising the UV-cured product of the quantum dot composition of claim 9, resulting in the LED package.

Description

Composite particles, method for the production thereof and use thereof Technical Field The application relates to the field of quantum dot light conversion, in particular to a composite particle, a preparation method and application thereof. Background Quantum dot light emitting diodes (QD-LEDs) have received great attention as core devices for next generation display and lighting technologies by virtue of high color purity, good color saturation, and solution processibility. However, quantum dot materials are extremely sensitive to oxygen, moisture and thermal stress, easily resulting in photooxidation degradation and efficiency roll-off problems. The traditional QD-LED packaging technology mainly adopts organic silicon resin or epoxy resin as a packaging material, and the aging of the material is delayed by adding an antioxidant. In the traditional physical blending mode, the small molecular antioxidant has poor compatibility with a matrix material, is easy to migrate and volatilize from the matrix in the processing and using processes, so that the oxidation resistance is reduced, the common load type antioxidant is combined with a carrier mainly through physical adsorption, the binding force is weak, and the antioxidant is easy to desorb. Disclosure of Invention The application aims to provide composite particles, a preparation method and application thereof, and aims to solve the technical problem that an antioxidant is easy to fail in a carrier in the prior art. In a first aspect of the application, a composite particle is provided, the composite particle comprises inorganic oxide particles with a porous structure, and an antioxidant positioned in the porous structure, wherein the surface of the inorganic oxide particles is coated with a polymer shell, the polymer shell is made of a product of click polymerization of silane molecules with mercapto groups, thermally responsive vinyl monomers and non-thermally responsive vinyl monomers, the silane molecules with the mercapto groups are connected with the surface chemical bonds of the inorganic oxide particles, and when the composite particle is heated, the polymer shell groups shrink to expose the porous structure. Further, the thermally responsive vinyl monomer is selected from one or more of N-isopropyl acrylamide, N-diethyl acrylamide, 2- (dimethylamino) ethyl methacrylate, 2- (diethylamino) ethyl methacrylate, 2-methyl-2-acrylic acid-2- (2-methoxyethoxy) ethyl ester. Further, the average diameter of the inorganic oxide particles is 20-5000 nm, the pore diameter is more than 2 nm, and preferably, the inorganic oxide is at least one selected from silicon dioxide, aluminum oxide, zinc oxide and zirconium oxide. Further, the non-heat-responsive vinyl monomer is at least one selected from the group consisting of methyl methacrylate, styrene, octadecyl methacrylate, cyclohexyl methacrylate, n-butyl methacrylate, isobornyl acrylate, methyl acrylate, lauryl methacrylate, ethyl acrylate, vinyl acetate, butyl acrylate, and isooctyl acrylate. Further, the antioxidant comprises P, S or N element, preferably, the antioxidant is selected from one or more of hindered phenols, hindered amines, phosphites, thioesters or thioethers, and preferably, the antioxidant accounts for 0.1-20% of the mass of the inorganic oxide particles. Further, the mass of the thermally responsive vinyl monomer and the mass of the non-thermally responsive vinyl monomer independently account for 0.5-15% of the mass of the inorganic oxide particles. The preparation method comprises the steps of S1, preparing a dispersion liquid of inorganic oxide particles and a mixed liquid of a silane coupling agent with mercapto groups in a container, uniformly mixing the dispersion liquid and the mixed liquid to enable surface hydroxyl groups of the silane coupling agent and the inorganic oxide particles to be condensed to obtain silane molecules with the mercapto groups, S2, adding the thermal-response vinyl monomer, the non-thermal-response vinyl monomer and an initiator in the container, heating to enable click polymerization reaction to occur, S3, maintaining a certain temperature after the polymerization reaction is finished, adding the antioxidant in the container, uniformly mixing the antioxidant to enable the antioxidant to be adsorbed into the porous, S4, rapidly cooling to room temperature after the adsorption is finished, and finally separating, purifying and drying to obtain the composite particles. Further, the silane coupling agent having a mercapto group is selected from at least one of 3-mercaptopropyl (dimethoxy) monosilane, (3-mercaptopropyl) triethoxysilane, (3-mercaptopropyl) trimethoxysilane, 2-mercaptoethyl triethoxysilane, or 11-mercaptoundecyltrimethoxysilane. In a third aspect of the application there is provided a quantum dot composition comprising composite particles as described in any of the above, quantum dots and UV curable glue. In a fourth aspect of the present application