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CN-122011264-A - Light guide plate and preparation process thereof

CN122011264ACN 122011264 ACN122011264 ACN 122011264ACN-122011264-A

Abstract

The invention relates to the technical field of high polymer materials, and discloses a light guide plate and a preparation process thereof, the light guide plate is mainly prepared by polymerizing methyl methacrylate, styrene and polyalkenyl benzoxazine, then heating and melting, and performing injection molding. According to the invention, the p-hydroxystyrene, the alkylamine and the formaldehyde are used as raw materials, and the multi-alkenyl benzoxazine is obtained through a mannich reaction, so that on one hand, the heat resistance of the base material is improved by utilizing the benzoxazine structure contained in the multi-alkenyl benzoxazine, and on the other hand, the mechanical property of the base material is improved when the multi-alkenyl structure contained in the multi-alkenyl benzoxazine is copolymerized with the methyl methacrylate, and the multi-alkenyl benzoxazine is applied to the light guide plate, so that the heat resistance and the mechanical property of the light guide plate can be improved, and the service life and the application range of the light guide plate are prolonged.

Inventors

  • HE YONG
  • CHENG LONGXIN
  • MA YUEYING
  • HUANG GUANGRONG

Assignees

  • 重庆颖锋兴瑞光电科技有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (9)

  1. 1. The light guide plate is characterized by being prepared by polymerizing methyl methacrylate, styrene and polyalkenyl benzoxazine; the preparation process comprises the following steps: Step one, adopting p-hydroxystyrene, alkylamine and formaldehyde as raw materials, and obtaining polyalkenyl benzoxazine through a manniei reaction; and step two, taking methyl methacrylate, styrene and polyalkenyl benzoxazine as raw materials, carrying out polymerization reaction, heating and melting, injecting into a mold, and cooling and forming to obtain the light guide plate.
  2. 2. The light guide plate according to claim 1, wherein the specific preparation method of the polyalkenyl benzoxazine comprises the steps of adding alkylamine and formaldehyde into a solvent, stirring and dispersing at room temperature, adding p-hydroxystyrene into the solvent, carrying out reflux reaction for 5-8h, cooling to room temperature after the reaction is finished, concentrating under reduced pressure, separating and purifying to obtain the polyalkenyl benzoxazine.
  3. 3. The light guide plate according to claim 2, wherein the molar ratio of the alkylamine, formaldehyde, and p-hydroxystyrene is 1:4-6:2-3.
  4. 4. The light guide plate according to claim 2, wherein the solvent is one of chloroform, dioxane, toluene.
  5. 5. The light guide plate according to claim 2, wherein the alkylamine is one or more of ethylenediamine, 1, 3-propylenediamine, 1, 4-butylenediamine, 1, 5-pentylenediamine, 1, 6-hexamethylenediamine, 1, 7-heptylenediamine, and 1, 8-octylenediamine.
  6. 6. The light guide plate of claim 2, wherein the alkylamine further comprises tris (2-aminoethyl) amine.
  7. 7. The light guide plate according to claim 1, wherein the specific manufacturing method of the light guide plate comprises the steps of: Adding methyl methacrylate, styrene and polyalkenyl benzoxazine into deionized water, controlling the temperature to be 70-80 ℃, stirring and dispersing for 40-60min, adding potassium persulfate aqueous solution into the mixture, reacting for 10-14h, filtering after the reaction is finished, dissolving tetrahydrofuran, precipitating with deionized water, drying, heating and melting, injecting into a mould, and cooling and forming to obtain the light guide plate.
  8. 8. The light guide plate according to claim 7, wherein the mass fraction of the potassium persulfate aqueous solution is 1%.
  9. 9. The light guide plate according to claim 7, wherein the molar ratio of methyl methacrylate, styrene, polyalkenyl benzoxazine is 1:0.1-0.3:0.05-0.1.

Description

Light guide plate and preparation process thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a light guide plate and a preparation process thereof. Background The light guide plate is an optical element widely applied to the fields of backlight display and uniform illumination, and has the core function of converting a point light source or a linear light source into a uniform, soft and efficient surface light source. The method is widely applied to the fields of liquid crystal display backlight, illumination and the like. Polymethyl methacrylate (PMMA) is one of the most widely used materials of the light guide plate, but has the defects of high brittleness, poor impact resistance, easy cracking and breaking to generate silver marks when being impacted by the outside, poor heat resistance, and possibility of exceeding the tolerance limit of PMMA in equipment with poor heat dissipation performance, thereby causing lubrication deformation of the material and affecting the comprehensive performance of the light guide plate. Disclosure of Invention The invention aims to provide a light guide plate and a preparation process thereof, wherein p-hydroxystyrene, methyl methacrylate and the like are used as raw materials, and the light guide plate is prepared through a mannich reaction and a polymerization reaction, and the mechanical property and the heat resistance of the light guide plate are improved by utilizing alkenyl and benzoxazine structures contained in polyalkenyl benzoxazine, so that the problem of poor heat resistance and mechanical property of the PMMA light guide plate at the present stage is solved. It should be noted that, the light guide plate in the present invention is a blank (light guide plate for short) of a light guide plate, and the blank may be further processed (such as screen printing, laser engraving, grid engraving, UV screen printing) to obtain a light guide plate product directly applied to an electronic product. The aim of the invention can be achieved by the following technical scheme: the light guide plate is mainly prepared by polymerizing methyl methacrylate, styrene and polyalkenyl benzoxazine; the preparation process comprises the following steps: Step one, adopting p-hydroxystyrene, alkylamine and formaldehyde as raw materials, and obtaining polyalkenyl benzoxazine through a manniei reaction; and step two, taking methyl methacrylate, styrene and polyalkenyl benzoxazine as raw materials, carrying out polymerization reaction, heating and melting, injecting into a mold, and cooling and forming to obtain the light guide plate. Further, the specific preparation method of the polyalkenyl benzoxazine comprises the following steps: adding alkylamine and formaldehyde into a solvent, stirring and dispersing at room temperature, adding p-hydroxystyrene into the solvent, carrying out reflux reaction for 5-8h, cooling to room temperature after the reaction is finished, concentrating under reduced pressure, separating and purifying to obtain the polyalkenyl benzoxazine. Further, the molar ratio of the alkylamine, formaldehyde and the parahydroxystyrene is 1:4-6:2-3. Further, the solvent is one of chloroform, dioxane and toluene. Further, the alkylamine is one or more of ethylenediamine, 1, 3-propylenediamine, 1, 4-butylenediamine, 1, 5-pentylenediamine, 1, 6-hexamethylenediamine, 1, 7-heptylenediamine and 1, 8-octylenediamine. Further, the alkylamine also includes tris (2-aminoethyl) amine. Further, the specific preparation method of the light guide plate comprises the following steps: Adding methyl methacrylate, styrene and polyalkenyl benzoxazine into deionized water, controlling the temperature to be 70-80 ℃, stirring and dispersing for 40-60min, adding potassium persulfate aqueous solution into the mixture, reacting for 10-14h, filtering after the reaction is finished, dissolving tetrahydrofuran, precipitating with deionized water, drying, heating and melting, injecting into a mould, and cooling and forming to obtain the light guide plate. Further, the mass fraction of the potassium persulfate aqueous solution is 1%. Further, the molar ratio of the methyl methacrylate to the styrene to the polyalkenyl benzoxazine is 1:0.1-0.3:0.05-0.1. The invention has the beneficial effects that: The application takes p-hydroxystyrene, alkylamine and formaldehyde as raw materials, obtains polyalkenyl benzoxazine through manniei reaction, and then carries out polymerization reaction with methyl methacrylate and styrene, and the light guide plate is obtained through heating melting and injection molding. The light guide plate prepared by the application contains a heat-resistant rigid structure, namely a benzene ring structure and a benzoxazine structure, when the benzoxazine structure is heated, the benzoxazine structure can be subjected to ring-opening crosslinking to form a compact three-dimensional network structure, the high crosslinkin