Porous silica light diffusion agent with polymethyl methacrylate bonded on surface, and preparation method thereof

A technology of polymethyl methacrylate and porous silica, applied in the direction of silica, silicon oxide, etc., can solve the problems of unstable optical properties, brittleness, etc., and achieve improved brightness, light transmittance, and good weather resistance , Energy-saving and high-efficiency glare effect

Inactive Publication Date: 2020-04-21
SHANGHAI AUSELL CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica is often used as a light diffusing agent due to its excellent optical properties and easy-to-change morphology. The occurrence of brittleness and other phenomena

Method used

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  • Porous silica light diffusion agent with polymethyl methacrylate bonded on surface, and preparation method thereof
  • Porous silica light diffusion agent with polymethyl methacrylate bonded on surface, and preparation method thereof

Examples

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preparation example Construction

[0019] The preparation method of the porous silica light-diffusing agent of the surface-linked polymethyl methacrylate comprises the following steps:

[0020] (1) Under the condition of stirring at 25-45 degrees, add ammonia water and tetraethoxysilane to the mixed solution of water and ethanol, continue to react for 2-4 hours, wash and dry, and prepare silica pellets, wherein, The volume ratio of the tetraethoxysilane volume to water is 1:4-1:8, the volume ratio of the tetraethoxysilane volume to ethanol is 1:8-1:20, the tetraethoxysilane The volume ratio of silane volume to ammonia water is 1:2-1:6;

[0021] (2) Take the silica pellets prepared in step (1) in deionized water to prepare a mixed solution with a mass fraction of 3-50 wt%, and ultrasonically disperse it for 30 minutes; under stirring conditions, add a certain amount of surfactant agent, reacted for 1-3 hours; under stirring conditions, continue to add alkaline substances to the mixed solution, and control the c...

Embodiment 1

[0025] Under the condition of stirring at 35 degrees, 8 milliliters of ammonia water and 2 milliliters of tetraethoxysilane were added to the mixed solution of 8 milliliters of water and 40 milliliters of ethanol, and the reaction was continued for 3 hours and then washed and dried to obtain silica pellets; The above 0.4 g of silica pellets were dispersed in 10 ml of deionized water by ultrasonic for 30 minutes; under stirring conditions, 20 mg of cetyltrimethylammonium bromide was added and reacted for 2 hours; under stirring conditions, continue to 0.8 g of sodium hydroxide was added to the mixture. After continuing to react for 5 hours, the sample was washed and dried, and the sample was calcined at 450° C. for 3 hours to obtain superficially porous silica pellets; 4 g of superficially porous silica pellets were dissolved in 200 ml of toluene. Add 2 ml of 3-methacryloxypropyltrimethoxysilane as a silane coupling agent, reflux in an oil bath at 120 degrees for 8 hours, wash ...

Embodiment 2

[0027]Under the condition of stirring at 35 degrees, 8 milliliters of ammonia water and 2 milliliters of tetraethoxysilane were added to the mixed solution of 8 milliliters of water and 40 milliliters of ethanol, and the reaction was continued for 3 hours and then washed and dried to obtain silica pellets; The above 0.4 g of silica pellets were dispersed in 10 ml of deionized water by ultrasonic for 30 minutes; under stirring conditions, 30 mg of cetyltrimethylammonium bromide was added and reacted for 2 hours; under stirring conditions, continue to 0.8 g of sodium hydroxide was added to the mixture. After continuing to react for 5 hours, the sample was washed and dried, and the sample was calcined at 450° C. for 3 hours to obtain superficially porous silica pellets; 4 g of superficially porous silica pellets were dissolved in 200 ml of toluene. Add 2 ml of 3-methacryloxypropyltrimethoxysilane as a silane coupling agent, reflux in an oil bath at 120 degrees for 8 hours, wash t...

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Abstract

The invention discloses a porous silica light diffusion agent with polymethyl methacrylate bonded on the surface. The porous silica light diffusion agent with polymethyl methacrylate bonded on the surface is characterized by comprising silica spheres with rough porous morphology on the surface and polymethyl methacrylate bonded on the surface and accounting for 9.0-13.0% of the mass of silica; andthe particle size distribution of the silica spheres is 300-500 nm, and small holes with the hole diameter of 10-20 nm are distributed in the surfaces of the silica spheres. The light diffusion effect is greatly improved, the thickness of a plate is reduced, the material cost is reduced, the problems of high light transmittance and low haze in raw material matrix resin are solved, and the effectsof energy conservation, high efficiency and low possibility of generating a glare phenomenon are achieved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a porous silica light diffusing agent with polymethyl methacrylate on its surface and a preparation method thereof. Background technique [0002] With the development of technology and the times, it has gradually developed from the traditional white woven lamp. LED lighting is loved by people because it is more superior in environmental protection and service life, and can emit richer colors. However, LED is a semiconductor light source, and LED solid-state semiconductor is a combination of P-type semiconductor and N-type semiconductor. Among them, P-type semiconductors are dominated by holes, while N-type semiconductors are mainly filled with electrons. Once a positive current is connected, the excess energy is released in the form of photons. As a result, the LED light source has the characteristics of a point light source. When the distribution of the light sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/14C08L69/00C08L51/10C01B33/18
CPCC08F292/00C08L69/00C01B33/18C08L2201/10C01P2004/32C01P2004/62C01P2006/16C08F220/14C08L51/10
Inventor 夏文君朱建时海祥秦联盛张菁源
Owner SHANGHAI AUSELL CHEM TECH
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