A kind of preparation method of white fluorescent waterborne polyurethane coating

Abstract

The invention discloses a method for preparing a white fluorescent water-based polyurethane coating. The method is characterized by comprising the following steps: preparing red fluorescence diglycol and blue fluorescence diglycol, and mixing the red fluorescence diglycol and blue fluorescence diglycol with green fluorescence diamine so as to obtain white fluorescent powder; combining the fluorescent powder with the diglycol, partially or totally replacing a dihydric alcohol chain extender used in a water-based polyurethane synthetic process, and reacting with diisocyanate, macromolecule diglycol and a hydrophilic chain extender so as to obtain white fluorescent water-based polyurethane emulsion; and sequentially adding an antifoaming agent, a flatting agent, a thickening agent, an ultraviolet light absorber and deionized water into the emulsion, and complexing in a scuffing cylinder, thereby obtaining the white fluorescent water-based polyurethane coating. According to the method disclosed by the invention, due to the design and combination of red-green-blue three primary color fluorophores, the prepared white fluorescent water-based polyurethane coating is capable of emitting white fluorescence, the chromophore is difficult to migrate, the fluorescence persistence is high, and the color fastness is high.

Description

Technical field [0001] The invention belongs to the technical field of preparation of functional waterborne polyurethane materials, and specifically relates to a white fluorescent waterborne polyurethane coating and a preparation method thereof. Background technique [0002] At present, there are two main methods for obtaining white fluorescent polymer materials. One is to blend macromolecules with small organic molecules to obtain organic small molecule luminescent dye / polymer composite systems. The small molecules involved in the blending are Fluorescent or phosphorescent small molecule substances. Chinese patent 201410680487.2 discloses a method for preparing fluorescent plastic masterbatch for secondary conversion of LED light to white light, and Chinese patent 201610301213.7 discloses a white fluorescent cholesteric liquid crystal device based on chiral ions and a preparation process thereof. The white fluorescence of the two The preparation of materials is mostly carried o...

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Problems solved by technology

Chinese patent 201410680487.2 discloses a preparation method of fluorescent plastic masterbatch for secondary conversion of LED light to white light. Chinese patent 201610301213.7 discloses a chiral ion-based white fluorescent cholesteric liquid crystal device and its preparation process. The white fluorescent The preparation of materials is mostly carried out in the form of doping small molecules to polymers, and the obtained materials are insufficient in terms of stability, processability, and production cost. At the same time, these small molecule fluorescent dyes will aggregate in the polymer body and cause phase separation. The other is to apply the chromaticity principle of "synthesizing white light with two primary colors of blue light and orange light" or "synthesizing white light with three primary colors of red, green and blue" to the molecular design and chemical synthesis of white light polymer materials, Construct a single polymer system with 2 (two-color white light) or 3 (three-color white light) luminescent centers

Chinese patent 201310092827.5 discloses a method for preparing a fluorescent water-based polyurethane emulsion based on a chromophore in a diisocyanate, and Chinese patent 201310222308.6 discloses a fluorescent water-based polyurethane based on a chromophore in a glycol and a preparation method thereof, but These methods all use a system with a single luminescence center, and the color spectrum of the chromophore is incomplete, so it is impossible to prepare a water-based polyurethane material that can emit white fluorescence

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