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A kind of preparation method of polymer microparticle
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A technology of micro-particles and polymers, applied in the field of preparation of polymer micro-particles, can solve the problems of difficult realization of particles, large polymer particle size distribution, poor stability, etc., and achieves simple and efficient preparation method, reduced preparation cost, and particle distribution. single effect
Active Publication Date: 2018-04-24
SHENZHEN GUOHUA OPTOELECTRONICS +2
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Problems solved by technology
Generally speaking, the preparation of micron particles by chemical methods has the disadvantages of high cost, excessive particle size distribution of polymers, uncontrollable particle shape and particle size, inability to achieve special shape and precision particle preparation, poor stability, and difficulty in preparation by non-professionals , it is not easy to prepare larger size particles
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Embodiment 1
[0027] refer to figure 2 , the preparation steps of micron particles are as follows:
[0028] 1) Prepare the substrate and raw materials
[0029] The transparent glass with a thickness of 1 mm is cut to an appropriate size; a mask plate 2 with a plurality of holes 3 with a diameter of 10-500 μm is prepared.
[0030] Under yellow light conditions, according to the components and contents of the prepolymer mixture shown in Table 1, the weighed nematic liquid crystal A, nematic liquid crystal B, nematic liquid crystal C, chiral liquid crystal, photoinitiated Agent and polymerization inhibitor were mixed into the sample bottle to obtain prepolymer mixture 5, wherein the nematic liquid crystal A was 2-methyl-1,4-phenylene-bis(4-(3-(acryloyloxy ) propoxy) benzoate), structural formula such as I,
[0031]
[0032] Nematic liquid crystal B is 4-[[6-[(1-oxo-2-propenyl)oxyl]hexyl]oxyl]benzoic acid 4-methoxyphenyl ester, the structural formula is as II,
[0033]
[0034] The n...
Embodiment 2
[0053] The specific implementation steps are the same as in Example 1, the difference is that the components and contents of the prepolymer mixture are as shown in Table 2, and the photoinitiator 819 in the table is phenyl bis(2,4,6-trimethylbenzene Formyl) phosphine oxide, photoinitiator 2959 is two-hydroxyl-4'-(2-hydroxyethoxy)-2-methylpropiophenone, and the above-mentioned photoinitiators are all purchased from Tianjin Xiensi Biochemical Technology Co., Ltd. , the aperture of the mask plate is 500 microns, the hole spacing is 200 μm, and the light source intensity is 0.1W / cm 2 , the illumination time is 30s.
[0054] Component and content of prepolymer mixture in table 2 embodiment 2
[0055]
Embodiment 3
[0057] The specific implementation steps are the same as in Example 1, the difference is that the components and contents of the prepolymer mixture are shown in Table 3, and the photoinitiator 651 in the table is benzoin dimethyl ether, which was purchased from Tianjin Xiensi Biochemical Technology Co., Ltd. company, the aperture of the mask is 250 μm, the hole spacing is 300 μm, and the light source intensity is 0.5W / cm 2 , the illumination time is 30s.
[0058] Component and content of prepolymer mixture in table 3 embodiment 3
[0059]
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Abstract
The invention discloses a preparation method of polymer microparticles. The preparation method comprises the following steps of preparing a mask plate, wherein multiple holes are formed in the mask plate, and the hole diameter of the holes is 10 to 500 mum; putting the mask plate at one side of a pre-polymer mixture; irradiating the pre-polymer mixture from one side of the mask plate by using ultraviolet light, enabling the ultraviolet light to irradiate the pre-polymer mixture through the holes in the mask plate, carrying out polymerization and solidification on the pre-polymer mixture irradiated by the ultraviolet light, and obtaining the polymer microparticles. According to the preparation method of the polymer microparticles, disclosed by the invention, the particle diameter and the shape of the polymer microparticles obtained through solidification forming can be controlled through changing the size of the hole diameter and the shape of the mask plate, and particles in special shapes and precision can be prepared; the preparation method is simple and efficient, the particle distribution is single, the preparation precision is high, uncured prepolymer materials can be recycled and reutilized, and the preparation cost is greatly reduced.
Description
technical field [0001] The invention relates to the preparation technology of polymer microparticles, in particular to a preparation method of polymer microparticles. Background technique [0002] Existing methods for preparing microparticles can generally be classified into physical methods, chemical methods, and a combination of physical and chemical methods. Common physical methods include mechanical grinding, ball milling, evaporation and condensation methods, etc. Chemical methods mainly include colloid chemical methods, dissolving gel methods, solid-phase chemical reaction methods, azeotropic distillation methods, sonochemical methods, supercritical fluid methods, etc. . [0003] Among the physical methods, the mechanical grinding method grinds hard media and materials to generate various physical forces such as extrusion, shearing, and impact between particles to achieve the purpose of grinding and pulverizing materials. The grinding method is simple to operate, but...
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