CN108864673B - High-transparency ultraviolet-blocking polymer composition and preparation method and application thereof - Google Patents

High-transparency ultraviolet-blocking polymer composition and preparation method and application thereof Download PDF

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CN108864673B
CN108864673B CN201710328756.2A CN201710328756A CN108864673B CN 108864673 B CN108864673 B CN 108864673B CN 201710328756 A CN201710328756 A CN 201710328756A CN 108864673 B CN108864673 B CN 108864673B
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东为富
汪洋
王雪飞
李婷
马丕明
陈明清
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Jiangnan University
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    • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
    • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
    • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
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    • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
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    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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    • C08L2201/00—Properties
    • C08L2201/10—Transparent films; Clear coatings; Transparent materials
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    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/18—Spheres
    • C08L2205/20—Hollow spheres

Abstract

The invention discloses a high-transparency ultraviolet-blocking polymer composition, and a preparation method and application thereof. The composition comprises: polymer and hollow polydopamine nanoparticles; or a polymer, hollow polydopamine nanoparticles and an antioxidant; based on 100 parts by weight of the polymer; 0.5-10 parts by weight of hollow polydopamine nanoparticles; 0.01-1 part by weight of antioxidant. The preparation method comprises one of the following steps: (a) melting and blending the polymer, the hollow polydopamine nano-particles and/or the antioxidant according to the dosage to prepare the polymer composition; (b) and dissolving the polymer in an organic solvent, adding the hollow polydopamine nanoparticles with the amount, uniformly stirring and mixing, and drying to obtain the polymer composition. The invention maintains the transparency of the polymer, enhances the ultraviolet blocking capability and the light stability of the polymer and prolongs the service life of the polymer.

Description

High-transparency ultraviolet-blocking polymer composition and preparation method and application thereof
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a high-transparency ultraviolet-blocking polymer composition, and a preparation method and application thereof.
Background
The ultraviolet rays are divided into short-wave UVC (200-280nm), medium-wave UVB (280-320nm) and long-wave UVA (320-400nm) according to the length of the wavelength. Wherein the sun is the main source of natural ultraviolet light that is transmitted through the atmosphere and ultimately to the ground. Proper amount of ultraviolet rays can promote mineral metabolism in vivo and formation of vitamin D, and has the functions of sterilization and disinfection, but long-term ultraviolet radiation easily damages eyes, accelerates skin aging, and can induce skin diseases and even cause cancers. Meanwhile, the ultraviolet ray with high energy can destroy the chemical bond of the polymer and initiate the autoxidation reaction, which finally causes the mechanical property of the resin to be obviously reduced and influences the service life of the material.
Development of ultraviolet shielding materials has been conducted without departing from the development of ultraviolet shielding agents which can achieve the purpose of blocking ultraviolet rays by absorbing or reflecting ultraviolet rays. Ultraviolet screening agents can be broadly classified into organic ultraviolet screening agents (benzotriazoles, benzophenones, salicylic acids) and inorganic ultraviolet screening agents (mainly metal oxide nanoparticles), each of which has drawbacks and disadvantages. For example: although the commonly used organic ultraviolet screening agent has high ultraviolet absorption efficiency, the commonly used organic ultraviolet screening agent has the defects of poor thermal stability, easy loss in the using process, easy degradation by free radicals and the like; although the inorganic ultraviolet screening agent has good light and heat stability, the inorganic ultraviolet screening agent is often incompatible with a polymer matrix, so that the system is opaque, and meanwhile, the inorganic ultraviolet screening agent has generally strong photocatalytic activity and is easy to degrade the polymer matrix. Although many studies have been made to improve the performance of uv-screening agents and coatings thereof, there is still no satisfactory demand for uv-screening agents and coatings thereof that are efficient, durable, easy to prepare and economical.
The ultraviolet ray resistance effect can also be realized by coating the ultraviolet ray resistance film on the surface of the polymer base material. The method has high requirements on coating precision, uniformity and coating effect, and the yield is difficult to control. Meanwhile, the durability is poor, and the layer film is easy to fall off from the surface of the base material.
Recently, the mechanism of UV reflection has been proposed in Advanced Functional Materials,2013,23(22):2805-2811 "Selective UV reflecting Mirrors Based on Nanoparticle Multilayers". Based on TiO2And ZnO particles are self-assembled layer by layer to prepare a multilayer composite film, the composite film can effectively reflect ultraviolet rays, and the defect that the particles absorb ultraviolet rays to induce the photodegradation of polymers is avoided. However, the methodThe method is complex to operate and difficult to industrially popularize.
Publication No. CN101233196A discloses a functional film containing melanin and a preparation method thereof, but the particle size of the melanin prepared by the method is uncontrollable, and the transparency of the functional film is low. There is also a document reporting that ultraviolet rays are shielded by a method of coating a poly dopamine layer on the surface of a polymer film, but the method is complicated to operate and the light transmittance of the film is low. Therefore, how to prepare a high-transparency uv-screening functional composition remains a critical issue.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a polymer composition, a preparation method and application thereof. The polymer composition obtained by the invention can maintain the high transparency of the polymer, simultaneously enhance the ultraviolet blocking capability of the polymer, prolong the service life of the polymer, and can be applied to the fields of ultraviolet radiation resistant materials and ultraviolet aging resistant photoelectric devices.
It is an object of the present invention to provide a highly transparent uv blocking polymer composition.
The composition is prepared from the following raw materials:
polymer and hollow polydopamine nanoparticles;
wherein the amount of the hollow polydopamine nanoparticles is 0.5-10 parts by weight based on 100 parts by weight of the polymer; preferably 1 to 5 parts by weight.
The polymer is a transparent polymer which is not crystallized or has smaller crystallized crystals; the visible light transmittance of the polymer is more than 85%; preferably at least one of polycarbonate, polystyrene, polymethyl methacrylate, polyvinyl alcohol, ABS copolymer, cycloolefin copolymer and polyethylene terephthalate.
The inner diameter of the hollow polydopamine nano-particle is 100-300 nm, the outer diameter is 110-340 nm, and the thickness of a polydopamine shell layer is 5-20 nm.
The hollow polydopamine nanoparticles are hollow polydopamine nanoparticles obtained by taking spherical nanoparticles as a template agent, carrying out oxidative polymerization on dopamine in an alkaline aqueous solution on the surfaces of the spherical nanoparticles to form a core-shell mechanism, and then removing the template agent by using an organic solvent;
the spherical nano particle template is one of polystyrene nano particles or silicon dioxide particles;
the organic solvent is one of tetrahydrofuran, toluene, ethylbenzene, xylene, dichloromethane, chloroform and hydrofluoric acid.
The particle size of the spherical nanoparticle template agent is 100-300 nm, and the mass ratio of dopamine to the template agent is 1: 3-2: 1.
The preparation method of the hollow polydopamine nanoparticles specifically comprises the following steps:
dissolving dopamine in water to prepare a solution, dispersing a spherical nanoparticle template in the dopamine solution, adjusting the pH value of the solution to 8.5-10, stirring, reacting for 12-24 hours, separating, washing, dissolving the spherical nanoparticle template in a solvent to remove the spherical nanoparticle template, washing, and drying in vacuum to obtain the hollow polydopamine nanoparticles.
The high-transparency ultraviolet-blocking polymer composition also comprises an antioxidant which is commonly used in the field and is also used in a conventional amount. In the present invention, antioxidants: at least one of antioxidant 1010, antioxidant 1076, antioxidant 628, antioxidant 168, 4 '-thiobis (6-tert-butyl-3-methylphenol), 4' -thiobis (6-tert-butyl-m-cresol), Irganox B900 and antioxidant 1098.
The antioxidant may be preferably used in an amount of 0.01 to 1 part by weight, based on 100 parts by weight of the polymer.
The ultraviolet cut-off wavelength range of the high-transparency ultraviolet barrier polymer composition is 380-400nm, and the short-wave ultraviolet transmittance below the wavelength of 280 is 0;
the high-transparency ultraviolet-blocking polymer composition has the average light transmittance of more than 80% in a visible light region with the wavelength of 450-800 nm.
The second purpose of the invention is to provide a preparation method of the high-transparency ultraviolet-barrier polymer composition.
The method comprises one of the following steps:
(a) melting and blending the polymer, the hollow polydopamine nano-particles and/or the antioxidant according to the dosage to prepare the polymer composition;
(b) and dissolving the polymer in a solvent, adding the hollow polydopamine nanoparticles with the amount, uniformly stirring and mixing, and drying to obtain the polymer composition.
The solvent is a solvent that can dissolve the polymer, such as: tetrahydrofuran, phenol, water, acetone, and the like.
The invention also aims to provide application of the high-transparency ultraviolet-blocking polymer composition.
The ultraviolet-proof film can be particularly applied to ultraviolet-proof human body protection clothes, lamps, glass films, sun-shading appliances or ultraviolet-proof photoelectric devices.
The invention has the beneficial effects that:
1. the polymer composite material has high ultraviolet shielding capacity, good transparency and visible light transmittance of over 80 percent, and has the characteristics of harmful ultraviolet isolation and high light transmittance.
2. The polymer composite material of the invention has excellent ultraviolet shielding property, and can be widely applied to human body protection clothes, lamps or glass films, or sun-shading appliances for preventing ultraviolet radiation, or ultraviolet photoelectric devices.
Drawings
FIG. 1 is a UV-Vis spectrum of a polymer composite prepared according to comparative example 1 of the present invention;
FIG. 2 is a graph of the UV-Vis spectrum of a polymer composite prepared in example 1 of the present invention;
FIG. 3 is a graph of the UV-Vis spectrum of a polymer composite prepared in comparative example 4 of the present invention;
FIG. 4 is a UV-Vis spectrum of a polymer composite prepared in example 4 of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
Preparation of hollow polydopamine nanoparticles
Preparation of hollow polydopamine nanoparticles 1: first, dopamine (specification: AR, provided by Aladdin Biotechnology, Inc.) is dissolved in water to prepare a solution (the concentration of dopamine is 50 g.L)-1) Then, polystyrene particles (Basff, average particle diameter 100nm) were dispersed in a dopamine solution (polystyrene concentration 150 g. L)-1) Adding NaOH solution to adjust the pH value of the solution to 8.5, stirring, reacting for 12 hours, separating, washing, dissolving with tetrahydrofuran (national pharmaceutical group chemical reagent Co., Ltd.) to remove polystyrene core, washing, and vacuum drying to obtain the final productHollow poly Dopamine nanoparticles 1(the inner diameter is 100nm, the outer diameter is 110nm, and the thickness of the polydopamine shell layer is 5 nm).
Preparation of hollow polydopamine nanoparticles 2: first, dopamine (specification: AR, provided by Aladdin Biotechnology, Inc.) is dissolved in water to prepare a solution (the concentration of dopamine is 50 g.L)-1). Then, polystyrene particles (Basff, average particle diameter 150nm) were dispersed in a dopamine solution (polystyrene concentration 50 g. L)-1) Regulating the pH value of the solution to 9 by using Tris-HCl buffer solution, stirring, reacting for 16 hours, separating, washing, dissolving in tetrahydrofuran (national pharmaceutical group chemical reagent Co., Ltd.) to remove polystyrene core, washing and vacuum drying to obtain the dopamine-template agent with the mass ratio of 1:1Hollow polymer Dopamine nanoparticles 2(the inner diameter is 150nm, the outer diameter is 180nm, and the thickness of the polydopamine shell layer is 15 nm).
Preparation of hollow polydopamine nanoparticles 3: first, dopamine (specification: AR, provided by Aladdin Biotechnology, Inc.) is dissolved in water to prepare a solution (the concentration of dopamine is 50 g.L)-1). Then, silica particles (Basff, average particle diameter 300nm) were dispersed in a dopamine solution (silica concentration 25 g. L)-1) Adding NaOH solution to adjust the pH value of the solution to 10, stirring, reacting for 24 hours, separating, washing, dissolving with hydrofluoric acid (national drug group chemical reagent Co., Ltd.) to remove silicon dioxide core, washing, and vacuum dryingTo obtainHollow poly-dopa Amine nanoparticles 3The inner diameter is 300nm, the outer diameter is 340nm, and the thickness of a polydopamine shell layer is 20 nm).
Example 1
1000g of polycarbonate (Sauter-based Saber-based plastics, model 141R-701) and 5g of polycarbonate were weighedHollow polydopamine sodium Rice granules 1And 0.5g of 4, 4' -thiobis (6-tert-butyl-3-methylphenol) are fully and uniformly mixed in a high-speed mixer, and then the obtained premix is put into a double-screw extruder, the processing temperature is controlled at 255 ℃, and the polycarbonate composition particles are obtained through melting, plasticizing and granulating. Subsequently, the composition was dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 250 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in this example 1 are shown in table 1. The UV-Vis spectrum of the polymer composite material is shown in FIG. 2.
Comparative example 1
1000g of polycarbonate (Sauter base Saber base plastic, model number 141R-701) and 0.5g of 4, 4' -thiobis (6-tert-butyl-3-methylphenol) are weighed, fully and uniformly mixed in a high-speed mixer, then put into a double-screw extruder, the processing temperature is controlled at 255 ℃, and the polycarbonate composition particles are obtained through melting, plasticizing and granulating. Subsequently, the pellets were dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 250 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in comparative example 1 are shown in table 1. The UV-Vis spectrum of the polymer composite material is shown in FIG. 1.
Example 2
1000g of polystyrene (Taiwan Chimei, type PG-33) and 10g were weighedHollow polydopamine nanoparticles 2Fully and uniformly mixing in a high-speed mixer, putting the obtained premix into a double-screw extruder, controlling the processing temperature at 160 ℃, and carrying out melt plasticizing granulation to obtain the polystyrene composition particles. Subsequently, the composition was dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 250 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. This implementationExample 2 the results of the optical property tests of the prepared samples are shown in table 1.
Comparative example 2
1000g of polystyrene (Taiwan Chimei, model PG-33) is weighed and put into a double-screw extruder, the processing temperature is controlled at 160 ℃, and polystyrene particles are obtained through melting, plasticizing and granulating. Subsequently, the pellets were dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 250 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The results of the optical property tests of the samples prepared in this comparative example 2 are shown in table 1.
Example 3
1000g of polymethyl methacrylate (French Achima, model HFI-10), 10g of antioxidant 168 and 50g of antioxidantAir conditioner Cardiopolydopamine nanoparticles 3Fully and uniformly mixing in a high-speed mixer, putting the obtained premix into a double-screw extruder, controlling the processing temperature to be 250 ℃, and carrying out melt plasticizing granulation to obtain the polymethyl methacrylate composition particles. Subsequently, the composition was dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 250 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in this example 3 are shown in table 1.
Comparative example 3
1000g of polymethyl methacrylate (French Achima, model HFI-10) and 10g of antioxidant 168 are weighed and put into a double-screw extruder, the processing temperature is controlled at 250 ℃, and the polymethyl methacrylate particles are obtained through melting, plasticizing and granulating. Subsequently, the pellets were dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 250 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in this comparative example 3 are shown in table 1.
Example 4
100g of polyvinyl alcohol (Zhongpetrochemical Sichuan vinylon factory, trade name 1799) and 900g of distilled water are weighed and heated to be dissolved at 95 ℃, and then 10g of polyvinyl alcohol and distilled water are addedHollow polydopamine nanoparticles 3Adding into the solution, stirring, mixing, pouring into a container, and vacuum drying at 60 deg.CSamples were obtained and were hot-pressed to prepare 1.0mm thick coupons. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in this example 4 are shown in table 1. The UV-Vis spectrum of the polymer composite material is shown in FIG. 4.
Comparative example 4
100g of polyvinyl alcohol (Zhongpetrochemical Sichuan vinylon factory, brand 1799) and 900g of distilled water are weighed and heated to be dissolved at 95 ℃, then the mixed solution is poured into a container, vacuum drying is carried out at 60 ℃ to obtain a sample, and a sample piece with the thickness of 1.0mm is prepared by hot press molding. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in this comparative example 4 are shown in table 1. The UV-Vis spectrum of the polymer composite material is shown in FIG. 3.
Example 5
1000g of cycloolefin copolymer (mesopetrochemical) and 20g are weighed outHollow polydopamine nanoparticles 1Fully and uniformly mixing in a high-speed mixer, putting the obtained premix into a double-screw extruder, controlling the processing temperature at 200 ℃, and carrying out melt plasticizing granulation to obtain the cycloolefin copolymer composition particles. Subsequently, the composition was dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 200 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in this example 5 are shown in table 1.
Comparative example 5
Weighing 1000g of cycloolefin copolymer (mesopetrochemical) and putting the cycloolefin copolymer into a double-screw extruder, putting the mixture into the double-screw extruder, controlling the processing temperature at 200 ℃, and carrying out melting plasticizing granulation to obtain the cycloolefin copolymer composition particles. Subsequently, the pellets were dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 200 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared coupons were measured using a UV-2501 model UV-VIS spectrophotometer. The results of the optical property tests of the samples prepared in this comparative example 5 are shown in table 1.
Example 6
1000g of ABS resin (Taiwan Qimei) was weighedModel PG-33) and 25gHollow polydopamine nanoparticles 2And 10g of antioxidant 168 are fully and uniformly mixed in a high-speed mixer, the obtained premix is put into a double-screw extruder, the processing temperature is controlled at 190 ℃, and the ABS composition particles are obtained through melting, plasticizing and granulating. Subsequently, the composition was dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 200 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared film samples were measured using a UV-2501 model ultraviolet-visible spectrophotometer. The results of the optical property tests of the samples prepared in this example 6 are shown in table 1.
Comparative example 6
Weighing 1000g of ABS resin (Taiwan Qimei, model PG-33) and 10g of antioxidant 168, mixing in a high-speed mixer, placing the obtained premix into a double-screw extruder, and controlling the processing temperature at 190%
Figure BDA0001291874810000081
And obtaining ABS composition particles through melting plasticizing and granulating. Subsequently, the composition was dried under vacuum at 80 ℃ for 6 hours, and then hot-pressed (mold temperature 200 ℃ C.) to obtain a sample piece having a thickness of 1.0 mm. The optical properties of the prepared film samples were measured using a UV-2501 model ultraviolet-visible spectrophotometer. The results of the optical property tests of the samples prepared in this comparative example 6 are shown in table 1.
The optical performance and weather resistance of the sample wafers prepared in examples 1 to 6 and comparative examples 1 to 6 were tested by using a UV-2501 ultraviolet-visible spectrophotometer, and the test results are shown in Table 1.
TABLE 1 comparison of optical test Properties
Figure BDA0001291874810000091
From the performance test data of examples 1-6 and comparative examples 1-6 above, it can be analyzed that:
the polymer composite materials obtained in examples 1 to 6 have high ultraviolet blocking ability while maintaining high transparency.
Comparing fig. 1 and 2, it can be found that the ultraviolet cut-off wavelength range of the polycarbonate composite film material added with the hollow poly-dopamine nanoparticles in example 1 is 380-400nm, the ultraviolet blocking rate at 400nm is 60%, and ultraviolet rays below 280nm are almost completely blocked, while higher transparency is maintained; and the polycarbonate film material without the hollow polydopamine nanoparticles in the comparative example 1 has no ultraviolet blocking capability.
Comparing fig. 3 and 4, it can be found that the ultraviolet cut-off wavelength range of the polyvinyl alcohol composite film material added with the hollow polydopamine nanoparticles in example 4 is 380-400nm, the ultraviolet blocking rate at 400nm is 70%, and ultraviolet rays below 280nm are almost completely blocked, while higher transparency is maintained; while the polyvinyl alcohol film material without the hollow polydopamine nanoparticles in comparative example 4 has no ultraviolet blocking ability.
In conclusion, the polymer composition has stronger ultraviolet blocking capability and high transparency. The polymer composite material of the present invention can be applied to ultraviolet radiation-proof human body protection clothes, lamps, glass films, or sun-shading appliances, or ultraviolet radiation-proof photoelectric devices.

Claims (10)

1. A high-transparency ultraviolet barrier composition is characterized by being prepared from the following raw materials:
polymer and hollow polydopamine nanoparticles;
wherein the amount of the hollow polydopamine nanoparticles is 0.5-10 parts by weight based on 100 parts by weight of the polymer;
the polymer is a transparent polymer which is not crystallized or has smaller crystallized crystals;
the visible light transmittance of the polymer is more than 85%;
the inner diameter of the hollow polydopamine nano-particle is 100-300 nm, the outer diameter is 110-340 nm, and the thickness of a polydopamine shell layer is 5-20 nm.
2. The high transparency uv blocking composition according to claim 1, wherein:
the polymer is at least one of polycarbonate, polystyrene, polymethyl methacrylate, polyvinyl alcohol, ABS copolymer, cyclic olefin copolymer and polyethylene terephthalate.
3. The high transparency uv blocking composition according to claim 1, wherein:
the amount of the polymer is 1-5 parts by weight based on 100 parts by weight of the hollow polydopamine nanoparticles.
4. The high transparency uv blocking composition according to claim 1, wherein:
the hollow polydopamine nanoparticles are hollow polydopamine nanoparticles obtained by taking spherical nanoparticles as a template agent, carrying out oxidative polymerization on dopamine in an alkaline aqueous solution on the surfaces of the spherical nanoparticles to form a core-shell mechanism, and then removing the template agent by using a solvent;
the spherical nano particle template is one of polystyrene nano particles or silicon dioxide particles;
the solvent of the silicon dioxide particle template agent is hydrofluoric acid;
the solvent of the polystyrene nanoparticle template agent is one of tetrahydrofuran, toluene, ethylbenzene, xylene, dichloromethane and chloroform.
5. The high transparency uv blocking composition according to claim 4, wherein:
the particle size of the spherical nanoparticle template agent is 100-300 nm, and the mass ratio of dopamine to the template agent is 1: 3-2: 1.
6. The high transparency uv blocking composition according to claim 4, wherein:
dissolving dopamine in water to prepare a solution, dispersing a spherical nanoparticle template in the dopamine solution, adjusting the pH value of the solution to 8.5-10, stirring, reacting for 12-24 hours, separating, washing, dissolving the spherical nanoparticle template in a solvent to remove the spherical nanoparticle template, washing, and drying in vacuum to obtain the hollow polydopamine nanoparticles.
7. The high transparency UV blocking composition according to claim 1, further comprising an antioxidant,
wherein the antioxidant accounts for 0.01 to 1 part by weight based on 100 parts by weight of the polymer.
8. The high transparency uv blocking composition according to any one of claims 1 to 7, wherein:
the ultraviolet cut-off wavelength range of the high-transparency ultraviolet barrier composition is 380-400nm, and the short-wave ultraviolet transmittance below the wavelength of 280 is 0;
the high-transparency ultraviolet barrier composition has the average light transmittance of more than 80% in a visible light region with the wavelength of 450-800 nm.
9. A method for preparing the high-transparency uv-blocking composition according to any one of claims 1 to 8, wherein the method comprises one of the following methods:
(a) melting and blending the polymer, the hollow polydopamine nanoparticles and the optional antioxidant according to the dosage to obtain the composition;
(b) and dissolving the polymer in a solvent, adding the hollow polydopamine nanoparticles with the amount, uniformly stirring and mixing, and drying to obtain the composition.
10. Use of the highly transparent uv-blocking composition according to any one of claims 1 to 8 in uv-radiation protection of human body apparel, lamps or glass films, or sun protection devices, or uv-protection photovoltaic devices.
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