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Polymethacrylate copolymer and photodiffusion section bar prepared by adopting same as raw material

A polymethacrylate, methyl methacrylate technology, applied in optics, light guides, optical components, etc., can solve the problems of poor light resistance, damage to lamps or liquid crystal panels, yellowing, etc., and achieve high hygroscopicity. , Improve the effect of poor light resistance and improved light resistance

Active Publication Date: 2012-07-18
GUANGZHOU KEYUAN INNOVATIVE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The transparent resins often used in light-diffusing profiles include polycarbonate, polymethyl methacrylate, polystyrene, transparent polyolefin materials, polyethylene terephthalate, etc., but it is difficult for them to satisfy heat resistance, Physical property requirements such as hardness and water absorption
[0005] In recent years, acrylic resins are often used in the production of light diffusion profiles between the backlight modules of LCD monitors and LCD TVs. However, acrylic resins have relatively high hygroscopicity, and after absorbing water, they are easily deformed by heat, causing warping and affecting the light source. Uniform light transmission, and produce deformation, damage the lamp tube or LCD panel between assembly and related products
[0006] Although styrene resin is effective in improving hygroscopicity, there are also patents introducing methyl methacrylate, methacrylic acid, and styrene copolymer resins for light guide plate base materials, but due to the presence of benzene rings on the side groups, the light resistance is relatively low. Poor, especially under ultraviolet light, it is prone to yellowing and turbidity, which in turn affects its light transmission and mechanical properties

Method used

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  • Polymethacrylate copolymer and photodiffusion section bar prepared by adopting same as raw material
  • Polymethacrylate copolymer and photodiffusion section bar prepared by adopting same as raw material
  • Polymethacrylate copolymer and photodiffusion section bar prepared by adopting same as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A 250ml three-neck flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser was placed in a water bath, and 50ml of water and 0.0025g of a dispersant polyvinyl alcohol (PVA) (average molecular weight of 90,000, analytically pure, Guangzhou double bond) were added. Trading Co., Ltd.) composed of water phase and 75g of mixed monomer, install a condenser tube and feed in condensed water, turn on the stirring device, set the stirring speed at 250r / min, keep the water bath temperature at 75°C, and stir for 0.5h by timing to activate the dispersant; Add the initiator azobisisobutyronitrile (AIBN) and the crosslinking agent ethylene glycol dimethacrylate (EGD-MA) (the mass accounts for 4% of the mass of the mixed monomers) into the flask, and simultaneously pass nitrogen gas for 30min to remove Oxygen in the liquid phase, then react at a constant temperature of 75°C for 2 hours; filter the product after the reaction is completed, wash the product twice wi...

Embodiment 2

[0045] In a 250ml four-necked bottle with a reflux condenser, a constant pressure dropping funnel, a mechanical stirrer and a thermometer, add 80ml of isopropanol and 1 / 3 of the mixed monomer quality of the mixed monomer successively, and the quality of the mixed monomer is 80g, start the stirrer (stirring speed is 150r / min), make it mix and stir evenly, set the constant temperature water bath, when the temperature rises to the reflux temperature of solvent isopropanol 82 ℃, add 1 / 4 of the initiator AIBN quality, The stable temperature is at 85°C, and the remaining 2 / 3 of the mass of the mixed monomer is added dropwise, and the dropping time is 2h. After the dropwise addition, the reaction is 0.5h, and the remaining initiator is added to the flask, and the temperature is raised to 90°C. Keep the temperature for 4 hours, then lower the temperature, pour it out after cooling to room temperature, and filter it. The product is washed twice with ethanol, and dried under vacuum at 80...

Embodiment 3

[0047] A 250ml three-necked flask equipped with a thermometer, a mechanical stirrer, and a reflux condenser was placed in a water bath, and 60ml of water and 0.0025g of a dispersant polyvinyl alcohol (PVA) (average molecular weight of 90,000, analytically pure, Guangzhou double bond) were added. Trading Co., Ltd.) to mix the water phase and 80g of mixed monomers, install a condenser and feed condensed water, turn on the stirring device, set the stirring speed to 230r / min, keep the temperature of the water bath at 80°C, and stir for 40 minutes to activate the dispersant; Add the initiator azobisisobutyronitrile (AIBN) and the crosslinking agent ethylene glycol dimethacrylate (EGD-MA) (the mass accounts for 3% of the mass of the mixed monomers) into the flask, and simultaneously pass nitrogen gas for 20min to remove Oxygen in the liquid phase was reacted at constant temperature for 2 hours; after the reaction, the polymer product was washed 3 times with cold water, and suction fi...

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Abstract

The invention belongs to the field of preparation of optical materials and discloses a polymethacrylate copolymer, a photodiffusion section bar prepared by adopting the same as a raw material, as well as preparation methods and applications of the polymethacrylate copolymer and the photodiffusion section bar. The copolymer comprises the following components in parts by weight: 20-50 parts of methyl methacrylate, 2-15 parts of methacrylic acid and 40-75 parts of isobornyl methacrylate. The copolymer is prepared by carrying out suspension copolymerization or solution polymerization on the components, and the weight-average molecular weight of the product is 60,000-300,000. The photodiffusion section bar is prepared by adopting the method that the copolymer is mixed with a light diffusant of 0.1-5 percent, and then the obtained mixture is molten, granulated and shaped to prepare the photodiffusion section bar with a thickness of 0.5-4mm, wherein the light diffusant comprises crosslinking siloxane polymer particles, crosslinking polystyrene particles, crosslinking acrylic acid polymer particles, titanium dioxide particles or silicon dioxide particles. The section bar has good light diffusivity and light transmittance, can restrain a light source from transmitting and can meet the fabrication requirement of light guide section bars for liquid crystal displays and LED light sources.

Description

technical field [0001] The invention belongs to the field of optical material preparation, and relates to a polymethacrylate copolymer and a light-diffusing profile prepared by using it as a raw material, and also includes the preparation method and application of the two. The obtained light-diffusing profile has high light transmittance, high Brightness, high heat resistance, low water absorption and high surface hardness. Background technique [0002] Light diffusion profiles can obtain a uniform brightness surface due to their good light diffusion and permeability, so they are widely used in signage, advertising signs, display windows, projection back walls, and wall-mounted uniform lighting sources. In recent years, light diffusing materials have also been developed and applied to backlight materials of liquid crystal displays (Liquid Crystal Display, LCD). There are two types of backlight modules for liquid crystal display devices: edge-lit and direct-lit. Small and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/06C08F2/20C08F2/06C08L33/10C08K3/36G02B5/02G02B6/00
Inventor 徐迎宾
Owner GUANGZHOU KEYUAN INNOVATIVE MATERIALS
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