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Preparation method of waterproof fluorescent powder

A fluorescent powder and waterproof technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of poor luminous performance of coated phosphors, loss of performance of long-lasting phosphors, poor weather resistance of phosphors, etc., and achieve low overall cost , Improve water resistance and avoid performance degradation

Inactive Publication Date: 2010-03-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also coatings using organic matter, such as Chinese patents ZL01114025.9, ZL200610019317.5, etc., but organic matter-coated phosphors have poor weather resistance, and their performance decays quickly in high temperature or ultraviolet environments.
[0004] Chinese patent ZL01113200.0 discloses a silicate hydrolysis method to coat SiO on the surface of aluminate long afterglow powder 2 The method of glass coating, the patent ZL02116328.6 discloses a method of coating SiO with tetraethyl orthosilicate sol 2 Thin-film method, but these two methods need to add the phosphor powder into the aqueous solution, and the performance of the long-lasting phosphor has been greatly lost in the process, and the luminous performance of the final coated phosphor is also inferior to that of the initial uncoated phosphor. film powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 20 grams of aluminate long-lasting phosphor, and prepare a phosphor suspension with a concentration of 2g / 100ml with ethylene glycol; weigh NaSiO 3 9H 2 O 1 g, added to the phosphor suspension, stirred while ultrasonically dispersed for 30 min. The suspension was heated to 80°C and maintained while stirring. Prepared HNO 3 A solution with a volume ratio of 1:100 to absolute ethanol is added dropwise to the phosphor suspension at a rate of 2ml / min, and the pH meter display value of the phosphor suspension is controlled to be 10, and the dripping is stopped. Continue to keep warm and stir for 4 hours, centrifuge the suspension, wash it twice with absolute ethanol, and fully dry it in an oven. The coated phosphor is baked at 300°C for 1 hour, and the surface-coated SiO can be obtained after cooling. 2 aluminate phosphors.

Embodiment 2

[0026] Weigh 20 grams of aluminate long-lasting phosphor, and prepare a phosphor suspension with a concentration of 2g / 100ml with ethylene glycol; weigh NaSiO 3 9H 2 O 1 g, added to the phosphor suspension, stirred while ultrasonically dispersed for 30 min. The suspension was heated to 90°C and maintained while stirring. All the other conditions are with embodiment 1.

Embodiment 3

[0028] Weigh 20 grams of aluminate long-lasting phosphor, and prepare a phosphor suspension with a concentration of 2g / 100ml with ethylene glycol; weigh NaSiO 3 9H 2 O 1 g, added to the phosphor suspension, stirred while ultrasonically dispersed for 30 min. The suspension was heated to 80°C and maintained while stirring. Prepared HNO 3 A solution with a volume ratio of 1:100 to absolute ethanol was added dropwise into the phosphor suspension at a rate of 2ml / min, and the display value of the pH meter of the phosphor suspension was adjusted to 10.5. All the other conditions are with embodiment 1.

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Abstract

The invention relates to a preparation method of waterproof fluorescent powder, which comprises the following steps: coating a SiO2 inorganic oxide film on the surface of aluminate long afterglow fluorescent powder the chemical reaction formula of which is that Na2SiO3+2HNO3=H2SiO3+2NaNO3, and carrying out the reaction in an anhydrous system. A coating process comprises the following steps: 1. uniformly dispersing the long afterglow fluorescent powder into glycol to prepare a fluorescent powder suspension with the concentration of 1-10g / 100ml; 2. weighing a relevant amount of NaSiO3* 9H2O according to the proportion by weight of SiO2 to the fluorescent powder as (0.5-15):100, and adding the NaSiO3*9H2O into the fluorescent powder suspension; 3. heating the suspension to reach the temperature of 60-90 DEG C, controlling the temperature at the interval, and stirring; 4. preparing an absolute alcohol solution of HNO3, and dropwise adding the solution in the fluorescent powder suspension to obtain a coating film fluorescent powder suspension; and 5. centrifugalizing the coating film fluorescent powder suspension, then washing with ethanol for 1-3 times, fully drying, then burning at the temperature of 200-400 DEG C for 1-3 hours, and obtaining the coating film long afterglow fluorescent powder after cooling.

Description

technical field [0001] The invention relates to a surface coating method of long afterglow fluorescent powder. It belongs to the technical field of fluorescent powder preparation. Background technique [0002] Long afterglow luminescent material, also known as luminous material, is a kind of photoluminescent material. It is a kind of substance that absorbs sunlight or light produced by artificial light sources and emits visible light, and can continue to emit light after the excitation stops. Alkaline-earth aluminate series luminescent materials are currently known light-storing luminescent materials with the best luminous performance. Compared with the long afterglow luminescent materials of the traditional sulfide series, the alkaline earth aluminate luminescent materials have the advantages of long afterglow time, no radiation, and stable chemical properties. [0003] Alkaline-earth aluminate long-lasting phosphors (SrAl2O4:Eu2+, Dy3+) will undergo the following hydrol...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/64
Inventor 董岩邵起越曹同蒋建清
Owner SOUTHEAST UNIV
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