Organic silicon wrapped fluorescent powder for light emitting coating and preparation method and application thereof

Abstract

The invention relates to organic silicon wrapped fluorescent powder for a light emitting coating and a preparation method thereof, and further relates to an application of the organic silicon wrapped fluorescent powder in the light emitting coating. The organic silicon wrapped fluorescent powder is prepared by the following method: dissolving ethyl orthosilicate in mixed liquor of water and alcohol; first, adjusting the pH value to 1-2 by nitric acid, and then, adjusting the pH value to 5-7 by alkali to obtain a diluted liquid; adding fluorescent powder into the diluted liquid, and stirring and continuously adjusting the pH value to 7-8 by alkali to prepare the organic silicon wrapped fluorescent powder dispersed in the diluted liquid. The organic silicon wrapped fluorescent powder and the diluted liquid are added into the components of the light emitting coating, and a better embodiment is addition of a water-base resin film-forming material. According to the technical scheme provided by the invention, water-tolerant treatment and organic silicon wrapping are directly carried out in an aqueous phase, so that the fluorescent powder in a water-based medium has hydrolysis resistance and reduces the loss on light emitting property, the dispersibility of the fluorescent powder in the coating is improved to prevent coagulation by further improving the surface electrical property of the fluorescent powder.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an organic silicon-coated hydrolysis-resistant fluorescent powder for luminescent paints and a preparation method thereof, and also relates to its application in luminous paints. Background technique [0002] Water-based luminous paint is an environmentally friendly functional paint that uses water as a diluent, basically eliminates the presence of organic solvents, and contains rare earth long-lasting phosphors. It has the characteristics of safe production and construction, non-toxicity, and no odor. Rare earth long afterglow phosphors can absorb the excitation energy of sunlight or light, store part of the energy, and then slowly release the stored energy in the form of visible light, and can still emit visible light for a long time after the excitation is stopped. Applying it to water-based paint can endow the water-based paint with the special function of long af...

AI Technical Summary

Problems solved by technology

One is that some phosphors with good long-lasting luminous effect have poor water resistance and slowly decompose in water, which seriously reduces the luminous performance and even disappears in brightness

Such as SrAl 2 o 4 :Eu 2+ , Dy 3+ Soaking yellow-green long-lasting phosphors in water can increase the pH value of the water phase from 7 to 14, while the luminous brightness and afterglow performance disappear; the chemical stability of sulfide and sulfur oxide phosphors is poor, and they will also slowly dissolve in the water phase. break down

The above problems lead to poor construction performance and storage stability of water-based luminous coatings, and serious loss of luminous performance and afterglow effect

Second, when the long-lasting phosphor powder is added to the water-based paint, due to the inconsistent density and particle size of the phosphor powder and the paint, it will cause precipitation and layering, and the luminous uniformity of the water-based luminous paint is poor.

The coating process of the above technical solution is not carried out directly in the water phase, or does not solve the technical problem of avoiding the hydrolysis of the phosphor powder while coating the phosphor powder in the water phase, and the coating of the phosphor powder is not related to the preparation of the water-based luminescent coating. There are problems such as process disconnection, complicated process and difficult control