Search

CN-122012087-A - Blue-green fluorescent powder, fluorescent paint, preparation method and application thereof

CN122012087ACN 122012087 ACN122012087 ACN 122012087ACN-122012087-A

Abstract

The invention discloses blue-green fluorescent powder, fluorescent paint, a preparation method and application thereof. The preparation method of the blue-green fluorescent powder comprises the following steps of 1) providing raw material powder according to the chemical composition of the blue-green fluorescent powder, mixing the raw material powder with a fluxing agent to obtain mixed powder, wherein the chemical composition of the blue-green fluorescent powder is SrAl 2 O 4 ：Eu 2+ ,Dy 3+ , the raw material of aluminum is alpha nano alumina, the weight of the fluxing agent is 1-5wt% of the weight of the raw material powder, 2) performing primary sintering on the mixed powder under the conditions of reducing atmosphere and 1000-1500 ℃ to obtain primary sintered powder, crushing and grinding the primary sintered powder, performing secondary sintering under the conditions of reducing atmosphere and 800-1400 ℃ to obtain secondary sintered powder, and 3) performing ball milling on the secondary sintered powder to obtain the blue-green fluorescent powder. The blue-green fluorescent powder has higher initial afterglow intensity.

Inventors

  • LIU BO
  • WANG JIANGYAN
  • WANG ZHONGZHI
  • LI BO
  • QIAO XIN
  • WANG JING
  • ZHANG JUAN
  • HAO PENGCHENG
  • Wang Xuanhang
  • LIU YAYUAN

Assignees

  • 包头稀土研究院

Dates

Publication Date
20260512
Application Date
20260128

Claims (10)

  1. 1. The preparation method of the blue-green fluorescent powder is characterized by comprising the following steps of: 1) Providing raw material powder according to the chemical composition of the blue-green fluorescent powder, and mixing the raw material powder with a fluxing agent to obtain mixed powder, wherein the chemical composition of the blue-green fluorescent powder is SrAl 2 O 4 ：Eu 2+ ,Dy 3+ , the raw material of aluminum is alpha-type nano aluminum oxide, and the weight of the fluxing agent is 1-5wt% of the weight of the raw material powder; 2) Crushing and grinding the primary sintered powder, and then performing secondary sintering under the conditions of reducing atmosphere and 800-1400 ℃ to obtain secondary sintered powder; 3) And ball milling the secondary sintered powder for 0.5-10 hours to obtain the blue-green fluorescent powder.
  2. 2. The method according to claim 1, wherein in step 1), the raw materials further comprise oxides or inorganic salts of strontium, europium and dysprosium.
  3. 3. The preparation method of the flux according to claim 1, wherein in the step 1), the flux is composed of a boron-containing flux and a fluorine-containing flux, the weight ratio of the boron-containing flux to the fluorine-containing flux is 1:0.1-10, the boron-containing flux is selected from at least one of boric acid, borate and boron oxide, and the fluorine-containing flux solvent is selected from at least one of alkali metal fluoride and alkaline earth metal fluoride.
  4. 4. The preparation method according to claim 1, wherein in the step 2), the reducing atmosphere is composed of 1-10vol% of hydrogen and 90-99vol% of shielding gas; The primary sintering time is 1-10 h, and the secondary sintering time is 1-10 h.
  5. 5. The blue-green phosphor powder according to any one of claims 1 to 4, wherein the initial afterglow intensity of the blue-green phosphor powder is 2cd/m 2 or more.
  6. 6. Use of the blue-green phosphor according to claim 5 in the preparation of a fluorescent coating.
  7. 7. The fluorescent paint is characterized by being prepared from the following raw materials in parts by weight: 5-10 parts by weight of the blue-green fluorescent powder according to claim 5, 1-5 parts by weight of the yellow fluorescent powder, 8-40 parts by weight of the epoxy resin and 1-5 parts by weight of the curing agent.
  8. 8. The phosphor of claim 7, wherein the yellow phosphor has a chemical composition YAG Ce 3 + .
  9. 9. A method of preparing a fluorescent paint according to claim 7 or 8, comprising the steps of: 1) Mixing the blue-green phosphor of claim 5 with a yellow phosphor to obtain a mixed phosphor; 2) Mixing the mixed fluorescent powder with epoxy resin to obtain fluorescent paint; 3) And mixing the fluorescent paint with a curing agent to prepare the fluorescent paint.
  10. 10. Use of the fluorescent paint according to claim 7 or 8 in building exterior wall decoration and marking, road or bridge marking and emergency marking, characterized in that the initial afterglow intensity of the fluorescent paint is above 1cd/m 2 and the hardness is above 18.5 HV.

Description

Blue-green fluorescent powder, fluorescent paint, preparation method and application thereof Technical Field The invention relates to blue-green fluorescent powder, fluorescent paint, a preparation method and application thereof. Background The light-accumulating luminous paint is one kind of special paint capable of continuously emitting light in dark environment through absorbing and storing light energy, such as sunlight, lamplight, etc. The core principle is that fluorescent substances are activated under illumination, electrons are transited to a high energy state, then energy is slowly released and returned to a low energy state, and the energy is released in a light form in the process to form an afterglow effect. The light-storage type luminous paint has the characteristics of energy conservation and environmental protection, so that the light-storage type luminous paint is widely applied to the fields of luminous signs, fire-fighting signs, emergency lighting and the like of architectural decorations, roads and bridges and the like. Because the light-accumulating luminous paint is mainly used at night or in dark places, the requirements on the other brightness and afterglow time are higher. CN116554745A discloses a hydrophobic light-accumulating luminescent coating. The hydrophobic light-accumulating luminescent coating comprises, by mass, 45-55% of polyacrylic emulsion, 15-20% of long-afterglow luminescent material, 10-15% of inorganic filler, 0.15-0.30% of fluorescent powder, 5-10% of nano silicon dioxide, 2-5% of auxiliary agent, 2-4% of hydrophobic agent and the balance of deionized water. The hydrophobic light-accumulating luminescent coating can reduce the doping amount of the long-afterglow luminescent material while ensuring the brightness of the luminescent material, thereby reducing the cost, and the prepared coating has good hydrophobicity and self-cleaning property. However, the afterglow strength of the hydrophobic light-accumulating luminescent coating is not ideal. CN120310349a discloses a fluorescent architectural coating. The fluorescent building coating comprises, by mass, 25-30 parts of a first luminescent material, 5-8 parts of a second luminescent material, 8-10 parts of an optical synergistic material, 150-200 parts of aqueous acrylic resin, 30-40 parts of deionized water, 2-3 parts of cerium oxide particles, 0.5-1 part of an ultraviolet absorber, 1-2 parts of a plasticizer, 1-2 parts of an antifreezing agent, 0.5-1 part of a defoaming agent and 0.5-1 part of a polycarboxylate dispersant. The first luminescent material is SrAl 2O4：Eu2+/Dy3+, and the second luminescent material is self-made fluorescein sodium salt@SiO 2. The fluorescent building coating has high-efficiency fluorescent performance and long-acting durability. However, the afterglow intensity of the fluorescent architectural coating is not ideal. CN120988696a discloses a long afterglow self-luminous material based on multi-element rare earth synergistic sensitization. The long-afterglow self-luminous material takes SrAl 2O4 as a matrix, eu 2+、Dy3+、Nd3+ ternary rare earth ions are doped to form a luminous core to be coated, the mol ratio of Eu 2+,Dy3+ to Nd 3+ is 1 (0.4-0.6) (0.2-0.4), znO nano-pillar arrays are epitaxially grown on the surface of the luminous core in situ, a hydrophobically modified SiO 2 shell layer is coated on the surface of the ZnO nano-pillar, and the thickness of the SiO 2 shell layer is 50-100 nm. The long-afterglow self-luminous material adopts a solid phase synthesis process and red mud/fly ash industrial solid waste raw materials, and can realize lower carbon emission intensity. However, the long-afterglow self-luminous material has low afterglow strength. Disclosure of Invention Accordingly, an object of the present invention is to provide a method for preparing blue-green phosphor, which has high afterglow intensity. Another object of the present invention is to provide a blue-green phosphor. It is still another object of the present invention to provide the use of the above blue-green phosphor. It is yet another object of the present invention to provide a fluorescent coating. It is still another object of the present invention to provide a method for producing the above fluorescent paint. It is a further object of the present invention to provide the use of the fluorescent paint described above. The invention adopts the following technical scheme to realize the aim. In one aspect, the invention provides a method for preparing blue-green fluorescent powder, comprising the following steps: 1) Providing raw material powder according to the chemical composition of the blue-green fluorescent powder, and mixing the raw material powder with a fluxing agent to obtain mixed powder, wherein the chemical composition of the blue-green fluorescent powder is SrAl 2O4：Eu2+,Dy3+, the raw material of aluminum is alpha-type nano aluminum oxide, and the weight of the fluxing agent is 1-5wt% of the weig