Preparation method of water dispersion liquid of fluorescent polymer microsphere

Abstract

The invention belongs to the technical field of paint, and relates to a preparation method of water dispersion liquid of fluorescent polymer microsphere. The preparation method comprises the following steps: at first, dissolving tetraphenyl ethylene derivatives and an oil soluble initiator into acrylate mixed monomers, taking polyvinylpyrrolidone as the dispersion aid, dispersing the mixed organic monomers in the water phase at a high speed, and carrying out reactions for a while at a certain temperature under a certain stirring speed to obtain a fluorescent polymer microsphere water dispersion liquid system with a solid content of 25 to 75%. Due to the fixing effect of covalent bonds and wrapping effect of polymer chain segments, the movement of molecules of tetraphenyl ethylene derivatives is limited; and according to the principle of aggregation-induced emission, photoluminescence can be realized under the radiation of ultraviolet rays. Furthermore, the water dispersion liquid can be painted on a substrate to form a film, and thus can be applied to the field of fluorescent paint.

Description

technical field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a method for preparing an aqueous dispersion of fluorescent polymer microspheres. Background technique

[0002] Fluorescence is a photoluminescent phenomenon, and the application range of fluorescent materials is becoming wider and wider with the in-depth study of its properties. It has important applications in fields including organic pigments, optical brighteners, photooxidants, coatings, chemical and biochemical analysis, solar collectors, anti-counterfeiting marks, and drug tracers. Its characteristic is that it emits light when it is irradiated with ultraviolet rays, and it is completely dark when the irradiation is stopped. Composite fluorescent paint refers to the doping of fluorescent compounds into the paint polymer matrix, so that the cured coating has a fluorescent effect. Fluorescent coating is also called security coating because of its anti-counterfe...

Examples

Embodiment 1

[0037] The first step: dissolving tetraphenylethylene containing diacrylate groups in acrylate monomers to form an organic monomer mixture according to the following mass percentages,

[0038]

[0039] Then add an oil-soluble initiator, azobisisobutyronitrile, and the relative mass percentage of the oil-soluble initiator relative to the monomer mixture is 5%.

[0040] The second step: the organic monomer mixture obtained in the first step is dispersed in the water phase with 10% polyvinylpyrrolidone K30 in a mass ratio relative to the organic monomer mixture, and the mixture is disperse at a high speed of 5000 rpm Stir and disperse for 10 minutes to disperse evenly in the water phase.

[0041] The third step: at a stirring speed of 2000 rpm, the system was reacted at 70°C for 12 hours, and then cooled to room temperature to obtain an aqueous dispersion of fluorescent polymer microspheres. By controlling the relative ratio of the organic monomer mixture to water, Ratio, so ...

Embodiment 2

[0046] The first step: dissolving tetraphenylethylene containing diacrylate groups in acrylate monomers to form an organic monomer mixture according to the following mass percentages,

[0047]

[0048] Then add oil-soluble initiator azobisisobutyronitrile, its relative mass percentage relative to the monomer mixture is 1%.

[0049] The second step: the organic monomer mixture obtained in the first step is dispersed in the water phase with 5% polyvinylpyrrolidone K30 in a mass ratio relative to the organic monomer mixture, and the mixture is disperse at a high speed of 3000 rpm Stir and disperse for 15 minutes to disperse evenly in the water phase.

[0050] The third step: at a stirring speed of 1000 rpm, the system was reacted at 80° C. for 10 hours, and then cooled to room temperature to obtain an aqueous dispersion of fluorescent polymer microspheres, the solid content of which was 50% by weight.

Embodiment 3

[0052] The first step: dissolving tetraphenylethylene containing diacrylate groups in acrylate monomers to form an organic monomer mixture according to the following mass percentages,

[0053]

[0054] Then add oil-soluble initiator benzoyl peroxide, its relative mass percentage relative to the monomer mixture is 1%.

[0055]The second step: the organic monomer mixture obtained in the first step is dispersed in the water phase with 1% polyvinylpyrrolidone K90 in a mass ratio of 1% relative to the organic monomer mixture. Stir and disperse for 30 minutes to disperse evenly in the water phase.

[0056] The third step: at a stirring speed of 500 rpm, the system was reacted at 90° C. for 8 hours, and then cooled to room temperature to obtain an aqueous dispersion of fluorescent polymer microspheres with a solid content of 25% by weight.

[0057] Figure 4 Fluorescence spectra 1, 2, and 3 of the aqueous dispersions of fluorescent polymer microspheres prepared in different exam...

technical field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a method for preparing an aqueous dispersion of fluorescent polymer microspheres. Background technique

[0002] Fluorescence is a photoluminescent phenomenon, and the application range of fluorescent materials is becoming wider and wider with the in-depth study of its properties. It has important applications in fields including organic pigments, optical brighteners, photooxidants, coatings, chemical and biochemical analysis, solar collectors, anti-counterfeiting marks, and drug tracers. Its characteristic is that it emits light when it is irradiated with ultraviolet rays, and it is completely dark when the irradiation is stopped. Composite fluorescent paint refers to the doping of fluorescent compounds into the paint polymer matrix, so that the cured coating has a fluorescent effect. Fluorescent coating is also called security coating because of its anti-counterfe...

Examples

Embodiment 1

[0037] The first step: dissolving tetraphenylethylene containing diacrylate groups in acrylate monomers to form an organic monomer mixture according to the following mass percentages,

[0038]

[0039] Then add an oil-soluble initiator, azobisisobutyronitrile, and the relative mass percentage of the oil-soluble initiator relative to the monomer mixture is 5%.

[0040] The second step: the organic monomer mixture obtained in the first step is dispersed in the water phase with 10% polyvinylpyrrolidone K30 in a mass ratio relative to the organic monomer mixture, and the mixture is disperse at a high speed of 5000 rpm Stir and disperse for 10 minutes to disperse evenly in the water phase.

[0041] The third step: at a stirring speed of 2000 rpm, the system was reacted at 70°C for 12 hours, and then cooled to room temperature to obtain an aqueous dispersion of fluorescent polymer microspheres. By controlling the relative ratio of the organic monomer mixture to water, Ratio, so ...

Embodiment 2

[0046] The first step: dissolving tetraphenylethylene containing diacrylate groups in acrylate monomers to form an organic monomer mixture according to the following mass percentages,

[0047]

[0048] Then add oil-soluble initiator azobisisobutyronitrile, its relative mass percentage relative to the monomer mixture is 1%.

[0049] The second step: the organic monomer mixture obtained in the first step is dispersed in the water phase with 5% polyvinylpyrrolidone K30 in a mass ratio relative to the organic monomer mixture, and the mixture is disperse at a high speed of 3000 rpm Stir and disperse for 15 minutes to disperse evenly in the water phase.

[0050] The third step: at a stirring speed of 1000 rpm, the system was reacted at 80° C. for 10 hours, and then cooled to room temperature to obtain an aqueous dispersion of fluorescent polymer microspheres, the solid content of which was 50% by weight.

Embodiment 3

[0052] The first step: dissolving tetraphenylethylene containing diacrylate groups in acrylate monomers to form an organic monomer mixture according to the following mass percentages,

[0053]

[0054] Then add oil-soluble initiator benzoyl peroxide, its relative mass percentage relative to the monomer mixture is 1%.

[0055]The second step: the organic monomer mixture obtained in the first step is dispersed in the water phase with 1% polyvinylpyrrolidone K90 in a mass ratio of 1% relative to the organic monomer mixture. Stir and disperse for 30 minutes to disperse evenly in the water phase.

[0056] The third step: at a stirring speed of 500 rpm, the system was reacted at 90° C. for 8 hours, and then cooled to room temperature to obtain an aqueous dispersion of fluorescent polymer microspheres with a solid content of 25% by weight.

[0057] Figure 4 Fluorescence spectra 1, 2, and 3 of the aqueous dispersions of fluorescent polymer microspheres prepared in different exam...

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