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CN-121022023-B - Modified polystyrene material, preparation method and light diffusion plate applied to modified polystyrene material

CN121022023BCN 121022023 BCN121022023 BCN 121022023BCN-121022023-B

Abstract

The invention discloses a modified polystyrene material, a preparation method and a light diffusion plate applied to the modified polystyrene material, relates to the technical field of light diffusion plate materials, and belongs to the patent publication number C08L53/02. The preparation method of the modified polystyrene material comprises the following steps of mixing a styrene monomer, an alpha-methyl styrene monomer, vinyl functionalized cage-type silsesquioxane, benzoyl peroxide and dodecyl mercaptan, carrying out polymerization reaction under the protection of nitrogen to obtain a polystyrene prepolymer, dispersing a lamellar zirconium phosphate nano-sheet in absolute ethyl alcohol, adding gamma- (methacryloyloxy) propyl trimethoxysilane and glacial acetic acid, carrying out reflux reaction to obtain a coupling agent modified zirconium phosphate nano-sheet, crushing the polystyrene prepolymer, carrying out high-speed premixing with the coupling agent modified zirconium phosphate nano-sheet, an antioxidant and a lubricant, drying, and then sending into a double-screw extruder for melt blending, extrusion, cooling, granulating and drying to obtain the modified polystyrene material. The modified polystyrene material prepared by the invention has excellent heat resistance.

Inventors

  • CHEN JINQUAN
  • WANG JUNSHUAI
  • CHEN JIALI
  • CHEN JIEXIAN
  • FAN QIUYUN

Assignees

  • 广东欧迪明光电科技股份有限公司

Dates

Publication Date
20260508
Application Date
20251024

Claims (8)

  1. 1. The preparation method of the modified polystyrene material is characterized by comprising the following steps of: S1, mixing a styrene monomer, an alpha-methylstyrene monomer, vinyl functionalized cage-type silsesquioxane, benzoyl peroxide and dodecyl mercaptan, wherein the mass ratio of the styrene monomer to the alpha-methylstyrene monomer to the vinyl functionalized cage-type silsesquioxane is 100:5-10:3-6, carrying out prepolymerization reaction at 75-80 ℃ under the protection of nitrogen, heating to 105-110 ℃ for continuous polymerization reaction, and cooling after the reaction is finished to obtain a polystyrene prepolymer; S2, dispersing the lamellar alpha-zirconium phosphate nano-sheets in absolute ethyl alcohol, adding gamma- (methacryloyloxy) propyl trimethoxy silane and glacial acetic acid, wherein the mass ratio of the lamellar alpha-zirconium phosphate nano-sheets to the gamma- (methacryloyloxy) propyl trimethoxy silane is 5:0.3-0.8, carrying out reflux reaction at 70-80 ℃, and centrifuging, washing and drying after the reaction is completed to obtain the coupling agent modified zirconium phosphate nano-sheets; S3, crushing the polystyrene prepolymer, then carrying out high-speed premixing with the coupling agent modified zirconium phosphate nano-sheet, the antioxidant and the lubricant, drying, and then sending into a double-screw extruder for melt blending, extrusion, cooling, granulating and drying to obtain the modified polystyrene material.
  2. 2. The method for preparing a modified polystyrene material according to claim 1, wherein in the step S1, the prepolymerization reaction time is 2-5 h.
  3. 3. The method for preparing a modified polystyrene material according to claim 1, wherein in the step S1, the polymerization reaction time is 3 to 6 hours.
  4. 4. The method for preparing a modified polystyrene material according to claim 1, wherein in the step S2, the reflux reaction time is 3-6 hours.
  5. 5. The method for preparing a modified polystyrene material according to claim 1, wherein in the step S3, the coupling agent modified zirconium phosphate nano-sheet is modified, and the method comprises the following steps: Dispersing the coupling agent modified zirconium phosphate nano-sheet in ethanol, adding 1-butyl-3-methylimidazole hexafluorophosphate ionic liquid, heating for reflux reaction, centrifuging, washing and drying after the reaction is finished, and obtaining the modified zirconium phosphate nano-sheet.
  6. 6. The preparation method of the modified polystyrene material according to claim 5, wherein the mass ratio of the coupling agent modified zirconium phosphate nano-plate to the 1-butyl-3-methylimidazole hexafluorophosphate is 5:1-2.
  7. 7. A modified polystyrene material prepared by the method of any one of claims 1 to 6.
  8. 8. A light diffusion plate prepared from the modified polystyrene material of claim 7.

Description

Modified polystyrene material, preparation method and light diffusion plate applied to modified polystyrene material Technical Field The invention relates to the technical field of light diffusion plate materials, belongs to patent publication number C08L53/02, and particularly relates to a modified polystyrene material, a preparation method and an applied light diffusion plate. Background The light diffusion plate is used as a core optical component in the fields of LED illumination, display equipment and the like, and has the core effect of realizing the optical effects of soft light emission and uniform illumination through scattering and homogenizing light rays. Among the substrates for preparing the light diffusion plate, polystyrene (PS), especially general polystyrene, has the remarkable advantages of low density, moderate light transmittance, low raw material cost, easy processing and forming and the like, and becomes one of ideal materials which are widely focused in the industry. However, the application and popularization of the light diffusion plate are severely limited by the heat resistance of the polystyrene material. From the material characteristics, carbon-carbon double bonds on benzene rings in a polystyrene molecular structure are easy to react under a high-temperature environment, so that the material has poor thermal stability, the softening temperature is about 80 ℃, and the thermal deformation temperature is not higher than 85 ℃. The characteristics enable the polystyrene light diffusion plate to face a plurality of problems in actual use, namely in a local high-temperature environment generated by long-time working of the LED lamp, the plate is easy to soften and warp, the structural integrity of equipment is damaged, and the problems of abnormal light diffusion path, uneven illuminance, color cast and other optical performance degradation caused by morphological change are caused. Meanwhile, the larger thermal expansion coefficient of polystyrene can aggravate the volume shrinkage difference caused by temperature change, and further worsen the deformation degree of the plate. Disclosure of Invention The invention aims to provide a modified polystyrene material, a preparation method and an applied light diffusion plate so as to solve the technical problem that the polystyrene light diffusion plate is poor in heat resistance in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation method of the modified polystyrene material comprises the following steps: s1, mixing a styrene monomer, an alpha-methylstyrene monomer, vinyl functionalized cage-type silsesquioxane, benzoyl peroxide and dodecyl mercaptan, performing a prepolymerization reaction at 75-80 ℃ under the protection of nitrogen, heating to 105-110 ℃ for continuous polymerization reaction, and cooling after the reaction is finished to obtain a polystyrene prepolymer; S2, dispersing lamellar alpha-zirconium phosphate nano-sheets in absolute ethyl alcohol, adding gamma- (methacryloyloxy) propyl trimethoxy silane and glacial acetic acid, carrying out reflux reaction at 70-80 ℃, centrifuging, washing and drying after the reaction is finished, and obtaining the coupling agent modified zirconium phosphate nano-sheets; S3, crushing the polystyrene prepolymer, then carrying out high-speed premixing with the coupling agent modified zirconium phosphate nano-sheet, the antioxidant and the lubricant, drying, and then sending into a double-screw extruder for melt blending, extrusion, cooling, granulating and drying to obtain the modified polystyrene material. In the technical scheme of the invention, the heat resistance of the polystyrene material is synergistically improved from two aspects. On the one hand, by introducing alpha-methyl styrene as a rigid comonomer into a polystyrene chain, the huge steric hindrance effect generated by alpha-methyl of the alpha-methyl styrene obviously increases the internal rotation resistance of a polymer main chain, so that the rigidity of a molecular chain is directly improved, and the material needs to absorb more energy when changing from a glass state to a high-elastic state, and the glass transition temperature is obviously improved. In addition, by introducing vinyl functionalized cage type silsesquioxane (V-POSS) as a nano hybrid cross-linking agent, a plurality of vinyl groups on the surface of the vinyl functionalized cage type silsesquioxane are copolymerized with styrene in the polymerization process, and a uniformly distributed three-dimensional covalent cross-linking network taking a hard inorganic siloxane cage as a node is formed in situ in a polymer matrix, and the network is like a microscopic reinforcement cage, so that the thermal movement capacity of a polymer molecular chain is greatly limited, and a chain segment is difficult to slide and creep when heated, thereby greatly improving the thermal deformati