CN109021528B - Method for improving short axis scattering direction scattering angle of anisotropic light scattering material - Google Patents
Method for improving short axis scattering direction scattering angle of anisotropic light scattering material Download PDFInfo
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Abstract
The invention provides a method for improving the scattering angle of a short-axis scattering direction of an anisotropic light scattering material, which is characterized in that a matrix of the light scattering material and a first scatterer are both transparent polymers, and particles with smaller particle size are introduced into the polymer scatterer to serve as a second scatterer, so that a composite scatterer with a 'compound eye' structure is formed, wherein the first scatterer is a 'big eye' and the second scatterer is a 'small eye'. The orientation deformation of the large-eye scatterer in the matrix is regulated and controlled by controlling the tensile force field of the polymer melt, so that the anisotropy is realized; the scatterers with small eyes are selectively distributed in the scatterers with large eyes or at the interface of the scatterers with large eyes and the matrix, and the scattering angle in the short-axis scattering direction is improved through the multiple scattering effect of the scatterers similar to the scatterers with compound eyes.
Description
Technical Field
The invention belongs to the field of polymer matrix composite material preparation processes, and particularly relates to a method for improving a short axis scattering direction scattering angle of an anisotropic light scattering material. The method is characterized in that the anisotropic light scattering material is prepared by utilizing the characteristic that a first scattering body of a composite scattering body forming a compound eye-like structure is easy to deform in an orientation mode, and a second scattering body is not easy to deform, and regulating the form of the first scattering body by utilizing methods such as hot stretch forming, flat die extrusion forming, extrusion-multistage stretch forming, blow molding or injection molding on the premise that the form of the second scattering body is not deformed or slightly deformed. The morphology of the first scatterer is changed, and the relative position of the second scatterer distributed in the first scatterer or at the interface with the matrix is changed. This can ensure that the scattering angle in one direction is increased while the scattering angle in the other direction is not excessively lost.
Background
Polymer-based light scattering materials can be classified into isotropic light scattering materials and anisotropic light scattering materials according to the scattering effect. The scattering light of the isotropic light-scattering material is distributed in a hemispherical shape, so that a scattering spot viewed in a plane perpendicular to the incident light is circular, and the scattering light distribution ranges in the horizontal direction and the vertical direction are the same. And the scattered light of the anisotropic light scattering material has different distribution ranges in the horizontal direction and the vertical direction. In practical applications, some occasions may have higher light intensity requirements for a single direction, such as road lighting, tunnel lighting, etc., and a larger light scattering angle in a certain direction is required. Therefore, the anisotropic light scattering material is prepared, and more light is scattered in the required direction, so that the effects of improving the light energy utilization rate, reducing the energy efficiency loss of the LED lamp, increasing the light source interval and reducing the illumination quantity are achieved. Meanwhile, the lighting angle is changed through controlled scattering, the influence of glare and light spots on driving is reduced and eliminated, and the driving safety and the comfort level are improved.
The anisotropic light scattering material can scatter incident light in two mutually perpendicular directions in different distribution ranges, so that point light sources are dispersed into a non-circular surface light source which is generally in an elliptical shape and a linear shape. Conventional anisotropic light scattering materials can be classified into anisotropic surface scattering materials and anisotropic body scattering materials according to the position of the scattering body in the matrix. Anisotropic surface scattering materials rely on the microstructure of the surface to act as a scattering, such as an ellipsoidal structure, a micro-prismatic structure, a conical structure, or other rough surface. Common preparation methods include chemical etching, holographic recording, electrospray, replica molding, hot molding, and optical etching. But the preparation cost is high, the method is not suitable for large-scale production, the maintenance is difficult, and the light scattering performance is easily influenced by pollution or scraping and other reasons in the using process. The anisotropic scattering material is composed of a matrix material and a scattering body material, the traditional scattering material refers to a light scattering material with a sea-island-like structure, and CN101122643A is prepared by adding glass fibers into a PMMA, PC or other transparent polymer matrix and extruding the mixture to obtain the anisotropic scattering material with high dimensional stability.
At present, more and more researchers are working on the preparation of anisotropic scattering materials by using polymer as scatterer and utilizing the deformation orientation of the polymer scatterer in the matrix, as shown in the schematic diagram of the scattering process of the anisotropic light scattering material in fig. 2, the scattering angle of light in the y direction (long axis scattering direction) is increased by increasing the length-to-diameter ratio of the polymer scatterer in the diagram, such as: ZL200610073916.5 was prepared by melt blending to obtain a light scattering sheet having amorphous polyester as a scatterer and crystalline olefin resin as a continuous phase, and then by hot stretching or uniaxial stretching by roll pressing. EP0464499A2 designs the die into a "T-shape" to produce LDPE/PS anisotropic light scattering materials. The preparation method can prepare light scattering materials with different degrees of anisotropy by adjusting the degree of orientation deformation of the polymer scatterer, but the light scattering materials comprise the following components: 1. only single light scattering effect can be generated, and the scattering angle is small; 2. while the scattering angle in the y direction (major axis scattering direction) is increased, the scattering angle in the x direction (minor axis scattering direction) is greatly reduced.
The structure of the scatterer has a great influence on the scattering effect of the light scattering material, and therefore, the preparation of light scattering particles having a special structure by a simple method becomes an important means for realizing a high-performance light scattering material.
Disclosure of Invention
The present invention has been made based on the above-described idea, and an object of the present invention is to: 1. the anisotropic light scattering material has the advantages of low production cost, simple preparation method, safety and reliability; 2. The scattering angle in one direction is improved, and meanwhile, the excessive loss of the scattering angle in the other direction is avoided; 3. the anisotropic light scattering angle of the light is adjustable.
In order to meet the above object, the present invention provides a method for increasing the scattering angle of the anisotropic light scattering material in the short axis scattering direction, characterized in that the matrix of the light scattering material and the first scatterer are both transparent polymers, and a composite scatterer of a kind of "compound eye" structure is formed with the first scatterer by introducing particles having smaller particle size as the second scatterer into the polymer scatterer.
The light scattering material with the scatterer in a structure similar to a compound eye takes one transparent polymer or two or more transparent polymers as a matrix, and the scattering particles in the structure similar to the compound eye are used as the scatterer. The scattering particles of the structure similar to the compound eye are characterized in that the first scatterer is a large eye, the second scatterer is a small eye, and the small eye is selectively dispersed in the large eye or at the interface of the large eye and the matrix. The difference value of the relative refractive indexes of the substrate and the first scatterer is 0.01-0.6 (namely, the refractive index is not less than 0.01 ≤ and the ray count is not more than 0.01 ≤n A -n B |≤0.6，n A Is the relative refractive index of the matrix and,n B relative refractive index of the first scatterer), preferably 0.01 to 0.2 (i.e., 0.01. ltoreq. calculation of the amount of the second scattering mediumn A -n B Less than or equal to 0.2); the difference value of the relative refractive indexes of the first scatterer and the second scatterer is 0.01-0.6 (namely, the refractive index is not more than 0.01 ≤ to count the cells)n B -n C |≤0.6，n B Is the relative refractive index of the first scatterer,n C relative refractive index of the second scatterer), preferably 0.01 to 0.2 (i.e., 0.01. ltoreq. calculation of the amount of the second scattering mediumn B -n C Less than or equal to 0.6). Under the same conditions, the second scatterer has a wetting coefficient ω < 1, preferably ω < -1, (ω ═ γ ═ 1C-B－γC-A)／γA-BWherein A, B and C respectively represent a matrix, a first scatterer and a second scatterer; gamma rayC-B，γC-A，γA-BRespectively represent the interfacial tension of the second scatterer and the first scatterer, the interfacial tension of the second scatterer and the substrate, and the interfacial tension of the substrate and the first scatterer), that is, the compatibility between the second scatterer and the first scatterer is better than that between the second scatterer and the substrateCompatibility.
Two-phase viscosity ratio P of first scatterer and matrix12.2, preferably P1≤1（P1＝ηd1／ηrIn which P is1Is the two-phase viscosity ratio of the first scatterer and the matrix; etad1Is the viscosity of the first scatterer; etarIs the viscosity of the matrix), i.e. the first scatterer is easily deformed in the matrix. In the forming process such as hot stretch forming, flat die extrusion forming, extrusion-multistage stretch forming, blow molding or injection molding, the first scatterer is subjected to orientation deformation along the extrusion or stretching direction, and the relative position of the second scatterer distributed in the first scatterer or at the interface of the first scatterer and the matrix is changed along with the orientation deformation, namely the second scatterer is randomly distributed in the first scatterer or at the interface of the first scatterer and the matrix while the first scatterer is deformed.
The matrix material refers to a transparent polymer or a transparent blend obtained by compounding two or more transparent polymers, and the transmittance of the transparent blend to visible light (400 nm-800 nm) is more than 80%, such as: thermoplastic resin materials such as PVC (polyvinyl chloride), PP (polypropylene), PE (polyethylene), PMMA (polymethyl methacrylate), PC (polycarbonate), PS (polystyrene), PET (polyethylene terephthalate), PEs (polyethersulfone), SAN (styrene-acrylonitrile copolymer), BS (butadiene-styrene copolymer), TPX (poly 4-methylpentene-1), MS (methyl methacrylate-styrene copolymer), transparent polyolefin materials, and thermosetting resin materials such as CR-39 (polydiallyl diglycol dicarbonate), J.D (derivative copolymer of PEs).
The first scatterer material is a transparent polymer material with transmittance of more than 80% for visible light (400 nm-800 nm), such as: thermoplastic resin materials such as PVC (polyvinyl chloride), PP (polypropylene), PE (polyethylene), PMMA (polymethyl methacrylate), PC (polycarbonate), PS (polystyrene), PET (polyethylene terephthalate), PEs (polyethersulfone), SAN (styrene-acrylonitrile copolymer), BS (butadiene-styrene copolymer), TPX (poly 4-methylpentene-1), MS (methyl methacrylate-styrene copolymer), transparent polyolefin materials, and thermosetting resin materials such as CR-39 (polydiallyl diglycol dicarbonate), J.D (derivative copolymer of PEs).
The second scatterer refers to inorganic particles or organic particles with a heat distortion temperature T ≧ 150 ℃, preferably T ≧ 250 ℃, such as: silicon dioxide (SiO)2) Titanium dioxide (TiO)2) Calcium carbonate (CaCO)3) Barium sulfate (BaSO)2) Alumina (Al)2O3) Inorganic particles such as calcium oxide (CaO), glass beads, and white carbon black; or organic particles such as polymethylsiloxane microspheres, polyethyl siloxane microspheres, silicone rubber microspheres, organic silicon resin, acrylate light scattering particles and the like. The particle size of the second scatterer should be less than 10um, preferably less than 1um, more preferably less than 800 nm.
The mass ratio of the matrix of the light scattering material of the scatterer with the structure similar to the compound eye structure to the first scatterer is 99/1-50/50, preferably 90/10-60/40; the weight of the second scatterer is 0.001% to 35%, preferably 0.001% to 15%, more preferably 0.001% to 10% of the total weight of the first scatterer.
The method for improving the scattering angle of the anisotropic light scattering material in the short axis scattering direction is characterized in that the anisotropy is realized by controlling the tensile force field of the polymer melt and regulating and controlling the degree of tensile deformation of the first scattering body in the polymer matrix composite material along the same direction. Specific examples of the method include hot stretch molding, flat die extrusion molding, extrusion-multi-stage stretch molding, blow molding, and injection molding. The thermal stretch forming method is a method for carrying out secondary thermal stretch treatment on an isotropic light scattering material, namely, a first scattering body of the isotropic light scattering material is subjected to thermal deformation and is converted into an ellipsoid shape or even a fiber shape from a spherical shape, then the light scattering performance of the light scattering material is converted from anisotropy to anisotropy, and the degree of the anisotropy can be controlled by a stretch ratio; the flat die extrusion molding method refers to a method in which the first dispersed phase of the light scattering material is oriented in the extrusion direction and is distributed in a fiber shape during the extrusion molding process, i.e., the method can directly prepare the anisotropic light scattering material; the extrusion-multistage stretching forming method is characterized in that a matrix, a first scatterer and a second scatterer are co-extruded from an extruder, and the in-situ fiber forming and uniform dispersion of the first scatterer in the matrix are realized through the multi-time stretching mixing action of a plurality of convergence-superposition units connected at a neck mold; the blow molding is a molding method that a tube blank obtained by extrusion or injection molding is placed in a mold, compressed air is introduced into the tube blank to blow the tube blank so that the tube blank is tightly attached to the cavity wall of the mold, and then the tube blank is cooled and demolded to obtain a hollow product, wherein the first scatterer is further oriented and deformed in the blowing process of the tube blank, namely the method can prepare a light scattering material with higher anisotropy; the injection molding is a method of adding the matrix, the first scatterer and the second scatterer into a charging barrel of an injection molding machine, injecting the mixture into a closed mold at high pressure and high speed from a nozzle at the front end of the charging barrel under the action of the rapid and continuous pressure of a plunger or a screw of the injection molding machine, and molding, wherein the first scatterer is subjected to orientation deformation while the material is extruded from the nozzle, namely the method can directly prepare the anisotropic light scattering material.
The substrate, the first scatterer, and the second scatterer according to the present invention should be subjected to a pretreatment process such as drying or surface modification before the start of processing. The drying process should be carried out in vacuum environment at 60 deg.C or above for more than 8 hr, preferably 80 deg.C or above for more than 12 hr. The surface treatment process is to increase the compatibility between the first scatterer and the second scatterer, and the specific treatment method is as follows: chemical modification, plasma modification, photochemical modification, radiation modification, and the like.
Chemical modification is a process of altering the surface properties of particles by chemical reaction, e.g. using Silica (SiO)2) Titanium dioxide (TiO)2) Calcium carbonate (CaCO)3) Barium sulfate (BaSO)4) Alumina (Al)2O3) Inorganic particles such as calcium oxide (CaO), glass beads, white carbon black, etc., or polymethylsiloxane microspheres, polyethylsiloxane microspheres, silicone rubberThe hydroxyl on the surface of organic particles such as the glue microsphere, the organic silicon resin, the acrylic light scattering particles and the like is reacted with the coupling agent by introducing the coupling agent, so that the purpose of changing the hydrophilicity of the surface of the particles into the lipophilicity is achieved.
The plasma modification is a method for changing the surface properties of particles by using plasma, organic matter steam receives the energy of the plasma to generate gas-phase free radicals, and the gas-phase free radicals are adsorbed on silicon dioxide (SiO)2) Titanium dioxide (TiO)2) Calcium carbonate (CaCO)3) Barium sulfate (BaSO)4) Alumina (Al)2O3) Inorganic particles such as calcium oxide (CaO), glass beads, white carbon black and the like or organic particles such as polymethyl siloxane microspheres, polyethyl siloxane microspheres, silicon rubber microspheres, organic silicon resin, acrylate light scattering particles and the like form surface free radicals on the surfaces, and the surface free radicals and monomers undergo polymerization reaction to generate a polymer film, so that the purpose of changing the hydrophilicity of the particle surfaces into lipophilicity is achieved.
Photochemical modification is a method for changing the surface properties of particles by using a photochemical method, and an initiator is added into silicon dioxide (SiO) under the influence of ultraviolet light2) Titanium dioxide (TiO)2) Calcium carbonate (CaCO)3) Barium sulfate (BaSO)4) Alumina (Al)2O3) The surface free radicals and monomers generate polymerization reaction to generate a polymer film, thereby achieving the purpose of changing the surface of the particles from hydrophilicity to lipophilicity.
The radiation modification is a method for changing the surface properties of particles by using high-energy rays (such as X rays, gamma rays and the like) to modify the surface properties of silicon dioxide (SiO)2) Titanium dioxide (TiO)2) Calcium carbonate (CaCO)3) Barium sulfate (BaSO)4) Alumina (Al)2O3) And oxidizing the mixtureThe surface of inorganic particles such as calcium (CaO), glass beads, white carbon black and the like or organic particles such as polymethyl siloxane microspheres, polyethyl siloxane microspheres, silicon rubber microspheres, organic silicon resin, acrylate light scattering particles and the like are activated, and the active points initiate monomer reaction to generate a polymer film, so that the aim of changing the surface of the particles from hydrophilicity to lipophilicity is fulfilled.
The anisotropic light scattering material containing the scatterer with the structure similar to the compound eye has the following advantages:
1. anisotropic light scattering materials containing scatterers of a "fly-eye" like structure have multiple scattering effects and therefore have larger scattering angles than conventional light scattering materials.
2. The anisotropic degree of the anisotropic light scattering material containing the scatterer with the structure similar to the compound eye can be regulated and controlled by regulating the size of the stretching ratio; the scattering angles in the orientation direction and the vertical orientation direction can be controlled by adjusting the conditions such as the type, concentration, and particle diameter of the first scatterer or the second scatterer.
3. The anisotropic light scattering material containing the scatterer with the structure similar to the compound eye increases the scattering angle in one direction, and simultaneously, the scattering angle in the other direction cannot be greatly reduced due to the existence of the second scatterer.
4. The invention adopts a melt blending method for preparation, and has the advantages of simple related equipment, easy mold processing, easy assembly, low manufacturing cost and convenient cleaning and maintenance.
The invention also has some advantages in other respects.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 shows a multiple scattering effect diagram of a second scattering body.
FIG. 2 is a schematic diagram of the scattering process of the anisotropic light scattering material.
Detailed description of the invention
The present invention is further specifically described below by way of examples. In the following examples, the amounts of the components are given by mass. It is to be noted that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention, and that the skilled person in the art may make modifications and adaptations of the present invention in view of the above disclosure.
The drying temperature of the matrix, the first scatterer and the second scatterer is 60-140 ℃, and preferably 80-130 ℃. The mass ratio of the base body to the first scatterer is 99/1-50/50, preferably 90/10-60/40. The weight of the second scatterer is 0.001% to 35%, preferably 0.001% to 15%, more preferably 0.001% to 10% of the total weight of the first scatterer. The specific processing mode is as follows:
1. the pretreated substrate, the first scatterer and the second scatterer are selected to be melted and blended by a double-screw extruder according to a certain proportion, and then the anisotropic light scattering material is directly prepared by an extrusion calendaring molding mode.
2. And (3) selecting the pretreated matrix, the first scatterer and the second scatterer according to a certain proportion, and carrying out melt blending and granulation (or melt blending and granulation by a torque rheometer) by a double-screw extruder to obtain the composite particles. And then the composite particles are subjected to secondary processing molding (such as extrusion molding, injection molding and the like) to prepare the anisotropic light scattering material.
3. And (3) selecting the pretreated matrix, the first scatterer and the second scatterer according to a certain proportion, and carrying out melt blending and granulation (or melt blending and granulation by a torque rheometer) by a double-screw extruder to obtain the composite particles. And then the composite particles are subjected to compression molding to prepare the isotropic light scattering material, and finally the anisotropic light scattering material is prepared by adopting hot stretch molding.
4. The pretreated matrix, the first scatterer and the second scatterer are selected to be melted, blended and extruded from an extruder according to a certain proportion, then enter a convergence-superposition unit to be divided into two strands, respectively enter a convergence runner, then are superposed together at an outlet, and then enter the next unit to repeat the same process or directly enter a traction cooling device. Through the combination of a plurality of convergence-superposition units, the uniform dispersion and in-situ fiber forming of the first scatterer in the matrix can be realized, and the optical material product with anisotropic light scattering performance is obtained.
Example 1
Polycarbonate (PC) in an amount of 70 parts by mass and acrylonitrile copolymer (SAN) in an amount of 30 parts by mass were melt-blended with polymethylsilsesquioxane beads (OSB 3) having a diameter of 10 μm, which account for 1.7%, 3.3%, 5.0%, 6.7% by mass of the total weight of SAN, respectively, by a torque rheometer, and pelletized to prepare polycarbonate composite particles, which were compression-molded at 240 ℃ into samples of 100.0mm (length) x 30.0mm (width) x 1mm (thickness). Then fixing the sample in a high-temperature universal tensile testing machine to be thermally stretched at 190 ℃, wherein the stretching ratio is 2. The scattering angles in the minor axis scattering direction (x direction) are measured to be 18.7 degrees, 20.1 degrees, 20.8 degrees and 22.0 degrees respectively, and the scattering angles in the major axis scattering direction (y direction) are measured to be 30.2 degrees, 30.9 degrees, 31.0 degrees and 32.3 degrees respectively.
Example 2
30 parts by mass of acrylonitrile copolymer (SAN) and nano calcium carbonate (nano-CaCO) which accounts for 1.7 percent, 3.3 percent, 5.0 percent and 6.7 percent of the total weight of the SAN and is subjected to surface treatment by using a silane coupling agent3) Extruding at 200 deg.C with miniature blending extrusion rheometer, granulating, and granulating to obtain SAN/nano-CaCO3The blend and 70 parts by mass of Polycarbonate (PC) were melt-blended in a torque rheometer, pelletized at 240 ℃ to obtain polycarbonate composite particles, and the composite particles were compression-molded at 240 ℃ into samples of 100.0mm (length) × 30.0mm (width) × 1mm (thickness). Then fixing the sample in a high-temperature universal tensile testing machine to be thermally stretched at 190 ℃, wherein the stretching ratio is 2. The scattering angles in the minor axis scattering direction (x direction) are measured to be 33.2 degrees, 35.9 degrees, 39.9 degrees and 41.1 degrees respectively, and the scattering angles in the major axis scattering direction (y direction) are measured to be 55.7 degrees, 57.4 degrees, 58.6 degrees and 59.1 degrees respectively.
Example 3
Polycarbonate (PC) in an amount of 70 parts by mass, acrylonitrile copolymer (SAN) in an amount of 30 parts by mass, and polymethylsilsesquioxane beads (OSB 1) having a diameter of 2 μm in an amount of 3.3% by mass based on the total weight of SAN were melt-blended by a torque rheometer, and pelletized to obtain polycarbonate composite particles, which were compression-molded at 240 ℃ into samples of 100.0mm (length) x 30.0mm (width) x 1mm (thickness). Then the sample is fixed in a high-temperature universal tensile testing machine to be thermally stretched at 190 ℃, and the stretching multiples are 2 and 2.5 respectively. The scattering angles in the minor axis scattering direction (x direction) are measured to be 27.4 degrees and 23.8 degrees, and the scattering angles in the major axis scattering direction (y direction) are measured to be 33.4 degrees and 31.0 degrees.
Comparative example 1
Polycarbonate (PC) in an amount of 70 parts by mass and acrylonitrile copolymer (SAN) in an amount of 30 parts by mass were melt-blended by a torque rheometer, and pelletized to obtain polycarbonate composite particles, which were then molded at 240 ℃ into a sample of 100.0mm (length) x 30.0mm (width) x 1mm (thickness). Then the sample is fixed in a high-temperature universal tensile testing machine to be thermally stretched at 190 ℃, and the stretching multiples are 2 and 2.5 respectively. The scattering angles in the minor axis scattering direction (x direction) are measured to be 16.5 degrees and 15.3 degrees, and the scattering angles in the major axis scattering direction (y direction) are measured to be 29.5 degrees and 28.6 degrees.
Claims (10)
1. A method for improving the scattering angle of a short-axis scattering direction of an anisotropic light scattering material is characterized in that a matrix of the light scattering material and a first scatterer are both transparent polymers, particles with smaller particle sizes are introduced into the polymer scatterers to serve as second scatterers, and the second scatterers are selectively distributed in the first scatterers or at the interface of the first scatterers and the matrix to form a composite scatterer with a 'compound eye' structure; the composite scatterer with the structure similar to the compound eye is characterized in that the first scatterer is taken as a large eye, the second scatterer is taken as a small eye, and the small eye is selectively dispersed in the large eye or at the interface of the large eye and the matrix; the particle size of the second scatterer is less than 800 nanometers;
in the processing processes of hot stretch forming, flat die extrusion forming, extrusion-multistage stretch forming, blow molding or injection molding, the first scatterer is subjected to orientation deformation along the extrusion or stretching direction, and the relative position of the second scatterer distributed in the first scatterer or at the interface of the first scatterer and the matrix is changed along with the orientation deformation, namely the second scatterer is randomly distributed in the first scatterer or at the interface of the first scatterer and the matrix while the first scatterer is deformed;
the method further comprises the following steps: the anisotropy is realized by controlling the tensile force field of the polymer melt and regulating and controlling the degree of tensile deformation of the first scatterer in the polymer matrix composite material along the same direction.
2. The method for improving the scattering angle of the anisotropic light scattering material in the short axis scattering direction according to claim 1, wherein the difference between the relative refractive indexes of the substrate and the first scattering body is 0.01-0.6.
3. The method for improving the scattering angle of the anisotropic light scattering material in the short-axis scattering direction according to claim 1, wherein the difference between the relative refractive indexes of the first scattering medium and the second scattering medium is 0.01 to 0.6.
4. The method for improving the scattering angle of the short axis scattering direction of the anisotropic light scattering material as claimed in claim 1, wherein the second scatterer has a wetting coefficient ω < 1, i.e. the compatibility between the second scatterer and the first scatterer is better than the compatibility between the second scatterer and the matrix.
5. The method for increasing the scattering angle of the short axis scattering direction of an anisotropic light scattering material as claimed in claim 1, wherein the first scattering body has a two-phase viscosity ratio P to the matrix12.2, i.e. the first scatterer is easily deformed in the matrix.
6. The method of claim 1, wherein the matrix material is a transparent polymer or a transparent blend of two or more transparent polymers, and the transmittance of the transparent blend to visible light is greater than 80%.
7. The method for improving the scattering angle of the short axis scattering direction of the anisotropic light scattering material as claimed in claim 1, wherein the first scattering medium is a transparent polymer having a transmittance of more than 80% for visible light.
8. The method for improving the scattering angle of the anisotropic light scattering material in the short axis scattering direction according to claim 1, wherein the thermal deformation temperature T of the second scatterer is not less than 150 ℃, and the second scatterer is silicon dioxide SiO2Titanium oxide TiO2Calcium carbonate CaCO3Barium sulfate BaSO4Aluminum oxide Al2O3Any one of calcium oxide CaO, glass beads, polymethyl siloxane microspheres, polyethyl siloxane microspheres, silicon rubber microspheres and acrylate light scattering particles.
9. The method for improving the scattering angle of the short axis scattering direction of the anisotropic light scattering material as claimed in claim 1, wherein the mass ratio of the substrate to the first scattering medium is 99/1 to 50/50.
10. The method of claim 1, wherein the second scattering medium is present in an amount of 0.001 to 35% by weight based on the total weight of the first scattering medium.
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