CN114213568A - Light conversion microsphere, preparation method and application - Google Patents
Light conversion microsphere, preparation method and application Download PDFInfo
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Abstract
The invention provides a light conversion microsphere, a preparation method and an anti-ultraviolet application, and belongs to the technical field of high polymer materials. Firstly, maleic anhydride copolymer microspheres are prepared by a simple and efficient precipitation polymerization method, and the microspheres can be obtained by centrifugation or filtration purification after the reaction is finished; and then grafting the fluorescent whitening agent to the maleic anhydride copolymer microspheres through esterification reaction, and after the reaction is finished, centrifuging or filtering and purifying to obtain the light conversion microspheres. The prepared microsphere can absorb ultraviolet light of 200-.
Description
Technical Field
The invention belongs to the field of functional composite materials, and particularly relates to a light conversion microsphere, a preparation method and application thereof, in particular to application in a transparent blue-light-emitting anti-ultraviolet composite material.
Background
In recent years, the amount of ultraviolet light reaching the earth's surface has increased dramatically due to the depletion of the ozone layer. It is well known that excessive exposure to uv light can cause damage not only to the skin, eyes and immune system of the human body, but also to the structure and properties of the polymeric material. Therefore, research on ultraviolet resistant materials has been receiving attention in recent years. It is of great significance to develop efficient uv shielding materials to reduce the adverse effects of uv radiation on the human body and polymeric materials.
One method of improving the uv shielding properties of polymer composites is to incorporate uv absorbers into the polymer material. Commonly used uv absorbers are mainly classified into two main classes, inorganic and organic uv absorbers. Inorganic UV absorbers such as TiO2ZnO and CeO2Has broadband shielding property and thermal stability, but is easy to generate photocatalysis and has poor compatibility with polymers. Commonly used organic uv absorbers include benzophenones, cinnamates, benzotriazoles, p-aminobenzoic acid and derivatives thereof. Organic uv absorbers have narrow-band absorption and high uv shielding efficiency, but are less photostable and thermally stable and migrate easily out of the polymer. Therefore, one method that is directly effective for solving the above problems is to straightenTo form macromolecular ultraviolet absorbent or graft micromolecular ultraviolet absorbent on nanometer or micrometer particles. The paper ACS apple Mater Interfaces 2017, 9(1), 868-Asa 875 a 2- [ 2-hydroxy-5- [2- (methacryloyloxy) ethyl group]Phenyl radical]the-2H-benzotriazole is a monomer, and ultraviolet-resistant nano and micro particles are prepared by emulsion polymerization and suspension polymerization, so that the ultraviolet absorbent is effectively prevented from migrating from a polymer matrix. Paper ACS Sustainable Chemistry&Engineering 2021, 9(18), 6427 and 6437 grafted ethanediyl ferulic acid ester to cellulose nanocrystals through a click reaction to obtain cellulose nanocrystals with good ultraviolet absorption. However, the above macromolecule ultraviolet absorbing monomers are dissipated by converting ultraviolet light into heat energy, cannot effectively utilize the ultraviolet light, and may increase the thermal aging of the polymer composite material.
If high-energy ultraviolet light is converted into low-energy blue fluorescence emission, the application of the ultraviolet absorbent can be greatly expanded. The blue light can effectively offset the yellow appearance of the polymer in natural light, thereby achieving the whitening effect. In addition, studies have shown that blue light favors photosynthesis by plants, and that shielding uv light can protect crops from uv-directed pests. The Applied Surface Science 2020, 510, 145405 produced a nitrogen-doped carbon dot and used to produce an ultraviolet shielding film, which can efficiently convert ultraviolet light into blue light. However, the carbon dot has poor shielding effect on the ultraviolet light of 250-300nm, and the preparation process of the effect is complex, needs high-temperature and high-pressure reaction conditions, and is not suitable for large-scale production. The fluorescent whitening agent can convert ultraviolet light into blue light, however, the small molecular fluorescent whitening agent also has the problems of poor light stability and easy migration from a polymer matrix, and the application of the fluorescent whitening agent-based light conversion microspheres in the ultraviolet-resistant composite material is not reported at present.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a light conversion microsphere, a preparation method and application thereof in a transparent blue-light-emitting anti-ultraviolet composite material. Firstly, maleic anhydride copolymer microspheres are prepared by a simple and efficient precipitation polymerization method, and the microspheres can be obtained by centrifugation or filtration purification after the reaction is finished; and then grafting the fluorescent whitening agent to the maleic anhydride copolymer microspheres through esterification reaction, and after the reaction is finished, centrifuging or filtering and purifying to obtain the light conversion microspheres. And then compounding the microspheres and a general high polymer material by a solution blending or melt blending method to prepare the transparent blue-light-emitting anti-ultraviolet composite material. The method is simple to operate, economical, efficient and suitable for industrial production.
The specific technical scheme of the invention is as follows:
in one aspect, a light conversion microsphere is provided, which converts between ultraviolet light and blue light, i.e. absorbs ultraviolet light of 200-.
In an alternative embodiment, the light conversion microspheres are composed of maleic anhydride copolymer microspheres and fluorescent whitening agent, and have a particle size of 400-1400 nm.
In an alternative embodiment, the maleic anhydride copolymer microspheres are composed of maleic anhydride, a vinyl monomer and a crosslinking agent, wherein the molar ratio of maleic anhydride, vinyl monomer and crosslinking agent is 100: (5-30).
In alternative embodiments, the fluorescent whitening agent is of the following structure:
wherein R is1is-N (C)2H4OH)2or-NHC2H4OH，R2is-NHC6H5or-NHC6H4SO3Na。
In an alternative embodiment, the maleic anhydride copolymer microspheres, the vinyl monomer is one or a combination of two or more of alpha-methylstyrene, styrene, vinyl acetate, alpha-ethylstyrene, 4-ethylstyrene, p-methoxystyrene, p-methylstyrene, isoprene, allylbenzene, vinyltoluene, cyclopentadiene, dicyclopentadiene, methylcyclopentadiene, methyldicyclopentadiene, dihydrodicyclopentadiene, dihydromethyldicyclopentadiene and dihydrodimethyldicyclopentadiene;
in alternative embodiments, the crosslinking agent is one or a combination of two or more of divinylbenzene, ethylene glycol dimethacrylate, and trimethylolpropane trimethacrylate.
In another aspect, a method for preparing a light conversion microsphere is provided, which includes the following steps:
(1) adding maleic anhydride, a vinyl monomer, a cross-linking agent and an initiator into a solvent, ultrasonically dissolving, and uniformly mixing to obtain a reaction system, wherein the concentration of the maleic anhydride in the reaction system is 0.2-1.5mol/L, the concentration of the vinyl monomer is 0.2-1.5mol/L, the mass of the initiator is 0.5-4 wt% of the total monomer content, the reaction system reacts for 1-12h at the temperature of 60-90 ℃ under the protection of inert gas, and then centrifuging or filtering for purification, and drying to obtain maleic anhydride copolymer microspheres;
(2) dissolving a fluorescent whitening agent in DMF, adding the maleic anhydride copolymer microspheres in the step (1), adding a catalyst after ultrasonic dispersion, reacting the reaction system at 70-100 ℃ for 12-48h under the protection of inert gas, then centrifuging or filtering, purifying, and drying to obtain the light conversion microspheres.
In an alternative embodiment, in the step (1), the solvent is one or a mixture of two or more of ethyl acetate, butyl acetate, isobutyl acetate, n-amyl acetate, isoamyl acetate, benzyl acetate, phenyl acetate, ethyl butyrate, isoamyl butyrate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, isoamyl benzoate, methyl phenylacetate, ethyl phenylacetate, propyl phenylacetate, butyl phenylacetate and isoamyl phenylacetate.
In an alternative embodiment, in the step (2), the mass ratio of the maleic anhydride copolymer microspheres to the fluorescent whitening agent is 1: 4 to 1: 1; the mass ratio of the maleic anhydride copolymer microspheres to the catalyst is 1: 2-1: 1.
In an alternative embodiment, the catalyst is triethylamine.
On the other hand, the application of the light conversion microsphere or the application of the preparation method are provided, the light conversion microsphere and the polymer matrix are mixed to prepare the transparent blue-light-emitting anti-ultraviolet composite material, and the light conversion microsphere accounts for 0.5-8 parts by weight of the polymer matrix.
In alternative embodiments, the polymer matrix is one or a combination of two or more of polyvinyl alcohol, polyurethane, polyvinyl chloride, polyethylene, polypropylene, and polyoxyethylene.
In an alternative embodiment, the ultraviolet-resistant composite material is applied to the fields of greenhouse agricultural film materials, anti-counterfeiting materials, packaging materials and window materials.
In another aspect, a method for preparing an anti-uv composite material is provided, wherein the method is selected from any one of the following two methods:
dissolving a polymer matrix in the solution, adding the light conversion microspheres, uniformly mixing, and then carrying out blade coating on a substrate or pouring in a mould, volatilizing and drying to prepare the transparent blue-light-emitting anti-ultraviolet composite material;
or melting and blending the polymer matrix and the ultraviolet-blue light conversion microspheres at 70-190 ℃ to prepare the transparent blue light-emitting anti-ultraviolet composite material.
The invention at least comprises the following beneficial effects:
1. compared with the traditional ultraviolet shielding composite material based on photo-thermal conversion, the ultraviolet shielding composite material prepared by the invention can convert harmful ultraviolet light into utilizable blue light, and the thermal aging of the material is reduced.
2. The preparation method of the light conversion microsphere is simple, the particle size of the microsphere is easy to regulate and control, the monodispersity is good, the ultraviolet resistance effect is excellent, and the light conversion microsphere is suitable for large-scale production.
3. The prepared composite material has excellent transparency, and the light conversion microspheres can improve the thermal stability of the polymer material and are not easy to migrate out of the polymer matrix.
Drawings
FIG. 1 is a scanning electron micrograph of light-converting microspheres of example 1;
FIG. 2 is an ultraviolet transmission spectrum of the transparent blue-emitting ultraviolet-shielding PVA composite film in example 5;
FIG. 3 is a fluorescence spectrum of a transparent blue-emitting UV-screening PVA composite film in example 5.
Detailed description of the invention
The sources of reagents used in the examples of the present invention are commercially available except where otherwise specified.
The initiator referred to in the embodiments of the present invention refers to: azobisisobutyronitrile, azobisisoheptonitrile, dibenzoyl peroxide.
It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation. Except for the raw materials used in the examples of the present invention, raw material components having the same functional groups as those contained in the raw materials used in the examples or containing the same structural units as those involved in the present invention, and substituted by equivalents, are included in the scope of the present invention. The present invention is further illustrated by the following specific examples.
The invention provides a drawing of the detection results of part of the embodiments, other embodiments and comparative examples adopt the same detection method, and a person skilled in the art can directly and unambiguously determine the content of the embodiments of the invention by using the detection method provided by the invention.
The light conversion microsphere provided by the embodiment of the invention is converted between ultraviolet light and blue light, namely, the ultraviolet light with the wavelength of 200-.
The light conversion microsphere provided by the embodiment of the invention consists of maleic anhydride copolymer microspheres and fluorescent whitening agents, and the particle size range of the light conversion microsphere is 400-1500 nm.
Preparing the light conversion microspheres:
example 1
(1) Preparation of maleic anhydride copolymer microspheres: 4.90g of maleic anhydride, 5.91g of alpha-methylstyrene and 0 are weighed out.65g of a crosslinking agent divinylbenzene (molar ratio of 100: 10) and 0.108g of an initiator azobisisobutyronitrile (1 wt% of the total mass of maleic anhydride and α -methylstyrene) were dissolved in 100mL of isoamyl acetate so that the concentration of maleic anhydride and α -methylstyrene in the reaction system was 0.5 mol/L. Introducing nitrogen into the system for 30min, reacting at 70 deg.C for 6h, centrifuging the reaction product at 12000 rpm for 5min, washing with methanol, centrifuging for three times, and vacuum drying to constant weightMaleic anhydride copolymer microspheres 1The particle size is shown in Table 1;
(2) preparing the light conversion microspheres: 0.8g of fluorescent whitening agent VBL is weighed, dissolved in 20mL of DMF and 0.2g is addedHorse Maleic anhydride copolymer microspheres 1Reacting with 0.3g of triethylamine at 90 ℃ for 24 hours under the protection of nitrogen, after the reaction is finished, centrifugally separating the reaction product at the rotating speed of 12000 r/min for 5min, adding methanol for washing, centrifuging for three times, and drying in vacuum to constant weight to obtain the final productPhoto-conversion microspheres 1The particle sizes are shown in Table 1. A scanning electron micrograph of the photo-convertible microspheres is shown in fig. 1.
The structure of the fluorescent brightener VBL used in this embodiment is:
example 2
(1) Preparation of maleic anhydride copolymer microspheres: 4.90g of maleic anhydride, 5.21g of styrene and 1.69g of trimethylolpropane trimethacrylate as a crosslinking agent (molar ratio: 100: 10) and 0.101g of azobisisoheptonitrile as an initiator (1 wt% of the total mass of maleic anhydride and styrene) were weighed and dissolved in 100mL of ethyl benzoate so that the concentrations of maleic anhydride and styrene in the reaction system were 0.5 mol/L. Introducing nitrogen into the system for 30min, reacting at 70 deg.C for 6h, centrifuging the reaction product at 12000 rpm for 5min, washing with methanol, centrifuging for three times, and vacuum drying to constant weightMaleic anhydride copolymer microspheres 2The particle size is shown in Table 1;
(2) preparing the light conversion microspheres: 0.8g of fluorescent brightener 220 is weighed out, dissolved in 20mL of DMF and 0.2g is addedHorse Maleic anhydride copolymer microspheres 2Reacting with 0.3g of triethylamine at 90 ℃ for 24 hours under the protection of nitrogen, after the reaction is finished, centrifugally separating the reaction product at the rotating speed of 12000 r/min for 5min, adding methanol for washing, centrifuging for three times, and drying in vacuum to constant weight to obtain the final productPhoto-conversion microspheres 2The particle sizes are shown in Table 1.
The structure of the fluorescent whitening agent 220 used in this example is:
example 3
(1) Preparation of maleic anhydride copolymer microspheres: 4.90g of maleic anhydride, 5.91g of alpha-methylstyrene and 0.65g of divinylbenzene as a crosslinking agent (molar ratio of 100: 10) and 0.108g of dibenzoyl peroxide as an initiator (1% by weight based on the total mass of maleic anhydride and alpha-methylstyrene) were weighed out and dissolved in 50mL of isoamyl acetate so that the concentrations of maleic anhydride and alpha-methylstyrene in the reaction system were 1.0 mol/L. Introducing nitrogen into the system for 30min, reacting at 70 deg.C for 6h, centrifuging the reaction product at 12000 rpm for 5min, washing with methanol, centrifuging for three times, and vacuum drying to constant weightMaleic anhydride copolymer microspheres 3The particle size is shown in Table 1;
(2) preparing the light conversion microspheres: 0.2g of fluorescent whitening agent 28 was weighed out, dissolved in 20mL of DMF and 0.2g was addedHorse Maleic anhydride copolymer microspheres 3Reacting with 0.4g of triethylamine at 80 ℃ for 36h under the protection of nitrogen, after the reaction is finished, centrifugally separating the reaction product at the rotating speed of 12000 r/min for 5min, adding methanol for washing, centrifuging for three times, and drying in vacuum to constant weight to obtain the final productPhoto-conversion microspheres 3The particle sizes are shown in Table 1.
The structure of the fluorescent whitening agent 28 used in this example is:
example 4
(1) Preparation of maleic anhydride copolymer microspheres: 4.90g of maleic anhydride, 5.21g of styrene, 0.65g of a crosslinking agent divinylbenzene (molar ratio of 100: 8) and 0.108g of an initiator azobisisobutyronitrile (1 wt% of the total mass of maleic anhydride and styrene) were weighed and dissolved in 200mL of isoamyl acetate so that the concentration of maleic anhydride and styrene in the reaction system was 0.25 mol/L. Introducing nitrogen into the system for 30min, reacting at 70 deg.C for 6h, centrifuging the reaction product at 12000 rpm for 5min, washing with methanol, centrifuging for three times, and vacuum drying to constant weightMaleic anhydride copolymer microspheres 4The particle size is shown in Table 1;
(2) preparing the light conversion microspheres: 0.4g of fluorescent whitening agent VBL is weighed out, dissolved in 10mL of DMF and 0.2g is addedHorse Maleic anhydride copolymer microspheres 4Reacting with 0.4g of triethylamine at 90 ℃ for 24 hours under the protection of nitrogen, after the reaction is finished, centrifugally separating the reaction product at the rotating speed of 12000 r/min for 5min, adding methanol for washing, centrifuging for three times, and drying in vacuum to constant weight to obtain the final productPhoto-conversion microspheres 4The particle sizes are shown in Table 1. Preparation of transparent blue-light-emitting uvioresistant composite material
Example 5
Preparing a transparent blue-light-emitting uvioresistant polyvinyl alcohol (PVA) composite film: dissolving PVA in water and adding the preparedPhoto-conversion microspheres 1(the mass of the microspheres in the composite material accounts for 7 wt%), uniformly dispersing to obtain a transparent blue-light-emitting anti-ultraviolet composite material, pouring the transparent blue-light-emitting anti-ultraviolet composite material into a polystyrene culture dish, naturally airing for a period of time, and then placing the transparent blue-light-emitting anti-ultraviolet composite material in a 40 ℃ oven for drying for 24 hours to obtain the transparent blue-light-emitting anti-ultraviolet composite materialTransparent blue-light-emitting ultraviolet-resistant PVA composite filmThe film thickness was 70 μm, and the optical properties thereof were measured as shown in Table 2. The ultraviolet transmission spectrum of the transparent blue-emitting ultraviolet-shielding PVA composite film is shown in fig. 2. The fluorescence spectrum of the ultraviolet-shielding PVA composite film that is transparent to emit blue light is shown in fig. 3.
Example 6
Preparing a transparent blue-light-emitting uvioresistant Polyurethane (PU) composite film:diluting the waterborne polyurethane to solid content of 10%, and adding the diluted waterborne polyurethane into the prepared polyurethanePhoto-conversion microspheres 2(the microspheres account for 5 wt% of the composite material by mass), uniformly dispersing to obtain a transparent blue-light-emitting anti-ultraviolet composite material, pouring the transparent blue-light-emitting anti-ultraviolet composite material into a polystyrene culture dish, naturally airing for a period of time, and then placing the transparent blue-light-emitting anti-ultraviolet composite material into a 40 ℃ oven to be dried for 24 hours to obtain the transparent blue-light-emitting anti-ultraviolet composite materialTransparent blue-light-emitting uvioresistant PU composite filmThe film thickness was 70 μm, and the optical properties thereof were measured as shown in Table 2.
Example 7
Preparing a transparent blue-light-emitting uvioresistant polyvinyl chloride (PVC) composite film: dissolving PVC in tetrahydrofuran and adding the preparedPhoto-conversion microspheres 3(the mass of the microspheres in the composite material accounts for 3 wt%), uniformly dispersing to obtain the transparent blue-light-emitting anti-ultraviolet composite material, pouring the transparent blue-light-emitting anti-ultraviolet composite material into a polystyrene culture dish, naturally airing for a period of time, and then placing the transparent blue-light-emitting anti-ultraviolet composite material in a 40 ℃ oven for drying for 24 hours to obtain the transparent blue-light-emitting anti-ultraviolet composite materialTransparent blue-light-emitting ultraviolet-resistant PVC composite filmThe film thickness was 70 μm, and the optical properties thereof were measured as shown in Table 2.
Example 8
Preparing a transparent blue-light-emitting uvioresistant Polyethylene (PE) composite film: weighing a certain amount of PE andlight conversion micro Ball 4(the mass ratio of the microspheres in the composite material is 1 wt%), a Haake internal mixer is used for melt blending, the processing temperature is 170 ℃, the processing time is 10min, the transparent blue-light-emitting uvioresistant composite material is obtained, and the transparent blue-light-emitting uvioresistant composite material is hot pressed into sheets to obtain the composite materialTransparent for blue light emission Anti-ultraviolet PE composite filmThe optical properties are shown in Table 2.
Comparative example 1
Dissolving PVA in water, pouring the PVA into a polystyrene culture dish according to the final film-forming thickness of 70 mu m, naturally airing the PVA for a period of time, and then placing the PVA in an oven at 40 ℃ for drying for 24 hours to obtain the PVA filmPure PVA filmThe optical properties are shown in Table 2.
Comparative example 2
Maleic anhydride copolymer microspheres 1 prepared in example 1(1) were used in place of those in example 5Photo-conversion microspheres 1Keeping the other conditions in example 5 unchanged to preparePVA composite filmOptical property test thereofAre shown in Table 2.
Comparative example 3
Prepared in example 2(1)Maleic anhydride copolymer microspheres 2Instead of in example 6Photo-conversion microspheres 2Keeping the other conditions in example 6 unchanged to preparePU composite filmThe optical properties are shown in Table 2.
Comparative example 4
Prepared in example 3(1)Maleic anhydride copolymer microspheres 3Instead of in example 6Photo-conversion microspheres 3Keeping the other conditions in example 7 unchanged to preparePVC composite filmThe optical properties are shown in Table 2.
Comparative example 5
Prepared in example 4(1)Maleic anhydride copolymer microspheres 4Instead of in example 6Photo-conversion microspheres 4Keeping the other conditions in example 8 unchanged to preparePE composite filmThe optical properties are shown in Table 2.
TABLE 1 average particle size of maleic anhydride copolymer and light-converting microspheres in examples 1-4
| Average particle diameter/nm of maleic anhydride copolymer | Average particle size/nm of light conversion microspheres | |
| Example 1 | 750 | 951 |
| Example 2 | 635 | 783 |
| Example 3 | 1280 | 1455 |
| Example 4 | 385 | 576 |
TABLE 2 optical Properties of composite films of examples 5-8 and comparative examples 1-5
The particle size of the light conversion microsphere is between 400-1500nm, and compared with an ultraviolet absorbent for photo-thermal conversion, the light conversion microsphere can convert ultraviolet light into utilizable blue light while endowing the material with ultraviolet shielding performance, so that the application in different fields is expanded; the addition of the fluorescent whitening agent improves the ultraviolet absorptivity of the microspheres, and excellent ultraviolet shielding effect can be achieved by only adding a small amount of microspheres, so that the higher transparency of the polymer composite film is ensured; in addition, the composite material prepared by the invention has excellent ultraviolet shielding performance and can improve the thermal stability of the material.
In conclusion, compared with the ultraviolet absorbent for photo-thermal conversion, the light conversion microsphere disclosed by the invention has obvious advantages and has good application prospects in the fields of greenhouse agricultural film materials, anti-counterfeiting materials, packaging materials, window materials and the like.
Those of ordinary skill in the art will understand that: the invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.
Claims (12)
1. A light conversion microsphere is characterized in that the light conversion microsphere is converted between ultraviolet light and blue light, namely absorbs the ultraviolet light of 200-.
2. The microsphere of claim 1, wherein the microsphere comprises maleic anhydride copolymer microsphere and fluorescent whitening agent, and the particle size of the microsphere is 400-1500 nm.
3. The light-converting microsphere of claim 2, wherein the maleic anhydride copolymer microsphere is composed of maleic anhydride, a vinyl monomer and a crosslinking agent, wherein the molar ratio of the maleic anhydride, the vinyl monomer and the crosslinking agent is 100: 5-30.
4. The light-converting microsphere of claim 2, wherein the optical brightener is of the structure:
wherein R is1is-N (C)2H4OH)2or-NHC2H4OH，R2is-NHC6H5or-NHC6H4SO3Na。
5. The microspheres of claim 3, wherein the vinyl monomer is one or a combination of two or more of α -methylstyrene, styrene, vinyl acetate, α -ethylstyrene, 4-ethylstyrene, p-methoxystyrene, p-methylstyrene, isoprene, allylbenzene, vinyltoluene, cyclopentadiene, dicyclopentadiene, methylcyclopentadiene, methyldicyclopentadiene, dihydrodicyclopentadiene, dihydromethyldicyclopentadiene, and dihydrodimethyldicyclopentadiene;
the crosslinking agent is one or the combination of more than two of divinylbenzene, ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate.
6. A method for preparing the light-converting microspheres according to any one of claims 1 to 5, comprising the steps of:
(1) adding maleic anhydride, a vinyl monomer, a cross-linking agent and an initiator into a solvent, ultrasonically dissolving, and uniformly mixing to obtain a reaction system, wherein the maleic anhydride is 0.2-1.5mol/L, the concentration of the vinyl monomer is 0.2-1.5mol/L, the dosage of the initiator is 0.5-4 wt% of the total mass of the maleic anhydride and the vinyl monomer, the reaction system reacts for 1-12h at the temperature of 60-90 ℃ under the protection of inert gas, and then the maleic anhydride copolymer microspheres are obtained through centrifugation or filtration purification and drying;
(2) dissolving a fluorescent whitening agent in DMF, adding the maleic anhydride copolymer microspheres in the step (1), adding a catalyst after ultrasonic dispersion, reacting the reaction system at 70-100 ℃ for 12-48h under the protection of inert gas, then centrifuging or filtering, purifying, and drying to obtain the light conversion microspheres.
7. The method according to claim 6, wherein in the step (1), the solvent is one or a mixture of two or more of ethyl acetate, butyl acetate, isobutyl acetate, n-amyl acetate, isoamyl acetate, benzyl acetate, phenyl acetate, ethyl butyrate, isoamyl butyrate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, isoamyl benzoate, methyl phenylacetate, ethyl phenylacetate, propyl phenylacetate, butyl phenylacetate and isoamyl phenylacetate.
8. The preparation method according to claim 6, wherein in the step (2), the mass ratio of the maleic anhydride copolymer microspheres to the fluorescent whitening agent is 1: 4-1: 1; the mass ratio of the maleic anhydride copolymer microspheres to the catalyst is 1: 2-1: 1.
9. The method according to claim 6 or 8, wherein the catalyst is triethylamine.
10. Use of the light-converting microspheres according to any one of claims 1-5 or the preparation method according to any one of claims 6-9, wherein the light-converting microspheres are mixed with a polymer matrix to prepare a transparent blue-light emitting anti-uv composite material, wherein the light-converting microspheres are present in an amount of 0.5-8 parts by weight based on 100 parts by weight of the polymer matrix.
11. The use according to claim 10, wherein the polymer matrix is one or a combination of two or more of polyvinyl alcohol, polyurethane, polyethylene, polypropylene, polyvinyl chloride, and polyoxyethylene.
12. The use according to claim 10, wherein the anti-ultraviolet composite material is applied in the fields of greenhouse agricultural film materials, anti-counterfeiting materials, packaging materials and window materials.
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