A kind of fluorescent alkenyl succinic anhydride sizing emulsion and preparation method thereof
A technology of alkenyl succinic anhydride and sizing emulsion, which is applied in the direction of water repellent addition, etc., can solve the problem of no obvious toxicity of carbon quantum dots, and achieve non-toxic and pollution-free emulsification costs, high sizing efficiency, and low dosage little effect
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Embodiment 1
[0029] Weigh urea and anhydrous citric acid and mix them according to the molar ratio of 9:1, add deionized water to form an aqueous dispersion with a mass fraction of 30%, stir evenly, put it into an autoclave, and heat at 200 ° C for 3 hours After cooling to room temperature, the obtained product was boiled at 100 ° C, then high-speed centrifugation at 20,000 rpm was used to remove large impurities in the lower layer, and the upper layer solution was dialyzed with a dialysis membrane with a molecular weight cut-off of 1000M for 48 hours. After dialysis, the particle size was 1~5nm. Fluorescent carbon quantum dots, dried at 105 °C to obtain carbon quantum dots solid powder, the aqueous dispersion is pale yellow under visible light, and can emit bright green fluorescence under the irradiation of an ultraviolet lamp (8W) with an excitation wavelength of 365nm, and the mass fraction The fluorescence intensity (PL) of the resulting carbon quantum dots in ethanol at 0.25% was 14220...
Embodiment 2
[0031] Weigh urea and anhydrous citric acid and mix them according to the molar ratio of 2:1, add deionized water to form an aqueous dispersion with a mass fraction of 10%, stir evenly, put it into an autoclave, and heat at 200 ° C for 3 hours After cooling to room temperature, the obtained product was boiled at 100°C, then high-speed centrifugation at 20,000 rpm was used to remove bulk impurities in the lower layer, and the upper layer solution was dialyzed with a dialysis membrane with a molecular weight cut-off of 1000M for 48 hours. After dialysis, the particle size was 4~10nm. Fluorescent carbon quantum dots, dried at 105 °C to obtain carbon quantum dots solid powder, the aqueous dispersion is pale yellow under visible light, and can emit bright blue fluorescence under the irradiation of an ultraviolet lamp (8W) with an excitation wavelength of 365nm. The fluorescence intensity (PL) of the obtained ethanol solution of carbon quantum dots with a fraction of 0.25% is 6127 (a...
Embodiment 3
[0033] Weigh urea and anhydrous citric acid and mix them according to the molar ratio of 6:1, add deionized water to form an aqueous dispersion with a mass fraction of 35%, stir evenly, put it into an autoclave, and heat at 200 ° C for 3 hours After cooling to room temperature, the obtained product was boiled at 100 ° C, then high-speed centrifugation at 20,000 rpm was used to remove large impurities in the lower layer, and the upper layer solution was dialyzed for 48 hours with a dialysis membrane with a molecular weight cut-off of 1000 M. After dialysis, a particle size of 2 to 5.5 was obtained. nm fluorescent carbon quantum dots, dried at 105 °C to obtain carbon quantum dot solid powder, its aqueous dispersion is pale yellow under visible light, and can emit bright blue fluorescence when irradiated by an ultraviolet lamp (8W) with an excitation wavelength of 365 nm. The fluorescence intensity (PL) of the obtained carbon quantum dot ethanol solution with a mass fraction of 0....
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