▎ 摘　　要

NOVELTY - Preparing a blue light scattering plate comprises (i) preparing a first dispersion liquid precursor containing inorganic submicron particles; (ii) mixing the first dispersion precursor and the polymer emulsion to obtain a first dispersion; (iii) preparing a second dispersion precursor containing inorganic nanoparticles; (iv) mixing the second dispersion precursor and the polymer emulsion to obtain a second dispersion; and (v) preparing the first dispersion liquid and the second dispersion liquid into a blue light scattering plate, where the preparation of the first dispersion liquid and the second dispersion liquid into a blue light scattering plate specifically comprises e.g. (1) obtaining a blue light scattering plate; (2) obtaining a blue light scattering plate; (3) obtaining a blue light scattering plate; and (4) mixing two dispersions, casting and drying the mixed dispersion casting layer to obtain a blue light scattering plate. USE - The method is useful in preparing blue light scattering plate is useful in Rayleigh scattering solar lamp system (claimed), office without natural environmental light, meeting room and underground market. ADVANTAGE - The method prepares blue light scattering plate with good Rayleigh scattering effect. DETAILED DESCRIPTION - Preparing a blue light scattering plate comprises (i) preparing a first dispersion liquid precursor containing inorganic submicron particles, where the material of the inorganic submicron particles is a variety of different inorganic materials with the particle size of 120-500 nm; (ii) mixing the first dispersion precursor and the polymer emulsion to obtain a first dispersion; (iii) preparing a second dispersion precursor containing inorganic nanoparticles, where the material of the inorganic nanoparticles is the same as or different from the material of the inorganic submicron particles, and the particle size of the inorganic nanoparticles is 30-120 nm; (iv) mixing the second dispersion precursor and the polymer emulsion to obtain a second dispersion; and (v) preparing the first dispersion liquid and the second dispersion liquid into a blue light scattering plate, where the preparation of the first dispersion liquid and the second dispersion liquid into a blue light scattering plate specifically comprises (1) mixing the first dispersion liquid and the second dispersion liquid in a predetermined ratio to obtain a mixed dispersion liquid, pouring the mixed dispersion onto a mold or a transparent material substrate to obtain a mixed dispersion casting layer and drying the mixed dispersion casting layer to obtain a blue light scattering plate; (2) pouring the second dispersion onto a mold or a transparent material substrate to obtain a first dispersion casting layer, casting the first dispersion onto the first dispersion cast layer to obtain a second dispersion cast layer, and combining the first dispersion cast layer and the second dispersion cast layer to form a monolithic dispersion liquid casting layer and drying the overall dispersion casting layer to obtain a blue light scattering plate; (3) partially pouring the first dispersion onto a part of the surface of the mold or a part of the surface of the transparent material matrix to obtain the first dispersion casting layer, partially pouring the second dispersion onto another part of the surface of the mold or another part of the surface of the transparent material matrix to obtain a second dispersion casting layer, and combining the first dispersion casting layer and the second dispersion casting layer to form a monolithic dispersion cast layer and drying the overall dispersion casting layer to obtain a blue light scattering plate; and (4) mixing two dispersions with different mass fractions of the inorganic submicron particles in the first dispersion and the mass fraction of the inorganic nanoparticles in the second dispersion to obtain mixed dispersions with different mass fractions liquid, casting the mixed dispersions with different mass fractions onto a mold or a transparent material substrate to obtain a mixed dispersion casting layer with different mass fractions and drying the mixed dispersion casting layer with different mass fractions to obtain a blue light scattering plate, where in the steps above (1) to (4), when pouring, the stirring speed and stirring time of the first dispersion liquid and the second dispersion liquid are different thus resulting in random distribution of particles with different densities. An INDEPENDENT CLAIM is also included for blue light scattering plate comprises a transparent polymer matrix, inorganic submicron particles and inorganic nanoparticles, the material of the inorganic submicron particles is a variety of different inorganic materials with the particle size of 120-500 nm, the material of the inorganic nanoparticles is the same as or different from the material of the inorganic submicron particles, the particle size of the inorganic nanoparticles is 30-120 nm and the inorganic submicron particles and the inorganic nanoparticles are randomly distributed in density in the transparent polymer matrix.