A kind of fluorescent alkenyl succinic anhydride sizing emulsion and preparation method thereof

Abstract

The invention relates to a fluorescent alkenyl succinic anhydride sizing emulsion and a preparation method thereof, belonging to the technical field of papermaking sizing agent emulsification. In the present invention, carbon quantum dots and bentonite are added to the alkenyl succinic anhydride sizing agent for the first time, and the alkenyl succinic anhydride sizing emulsion that can be used as a fluorescent papermaking sizing agent and effectively improve the water resistance of paper is successfully prepared. A new emulsification stabilizer is provided for alkenyl succinic anhydride sizing agent, and the stable emulsifier can make the sizing agent have fluorescent properties; in addition, carbon quantum dots and bentonite as emulsifiers have low consumption, non-toxic , Low cost and other advantages. The preparation process of the present invention is simple and does not need to add any surfactant, polymer polyelectrolyte and dye type fluorescent agent.

Description

technical field

[0001] The invention relates to a fluorescent alkenyl succinic anhydride sizing emulsion and a preparation method thereof, belonging to the technical field of papermaking sizing agent emulsification. Background technique

[0002] The transformation of the papermaking industry from acidic papermaking system to medium and alkaline papermaking is an innovative change in the papermaking process in the 20th century. This can not only improve the quality of paper and expand the range of fillers, but also reduce pulp consumption, reduce energy consumption, and reduce environmental pollution. Extend the life of equipment. At present, the paper-making sizing agents are mainly based on alkyl ketene dimer (AKD) and alkenyl succinic anhydride (ASA), and large and medium-sized paper mills gradually adopt ASA. Especially in recent years, due to its high reactivity, low cost of sizing material, and fast aging rate, ASA has been widely used in internal sizing of high-grade ...

Examples

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....

technical field

[0001] The invention relates to a fluorescent alkenyl succinic anhydride sizing emulsion and a preparation method thereof, belonging to the technical field of papermaking sizing agent emulsification. Background technique

[0002] The transformation of the papermaking industry from acidic papermaking system to medium and alkaline papermaking is an innovative change in the papermaking process in the 20th century. This can not only improve the quality of paper and expand the range of fillers, but also reduce pulp consumption, reduce energy consumption, and reduce environmental pollution. Extend the life of equipment. At present, the paper-making sizing agents are mainly based on alkyl ketene dimer (AKD) and alkenyl succinic anhydride (ASA), and large and medium-sized paper mills gradually adopt ASA. Especially in recent years, due to its high reactivity, low cost of sizing material, and fast aging rate, ASA has been widely used in internal sizing of high-grade ...

Examples

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....