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Method for preparing modified polymethyl methyl acrylate material

A polymethyl methacrylate, modification technology, applied in the direction of coating, can solve the problems of small surface hardness, low temperature of PMMA, poor heat resistance, etc., and achieve the effect of good hydrophilic durability

Inactive Publication Date: 2008-08-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use temperature of PMMA is low (65°C), poor heat resistance (thermal decomposition temperature ≤ 200°C), low surface hardness, and it is easily affected by ultraviolet rays in the sun and aging during use, which limits its application range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] 1. Preparation and chemical modification of titanium dioxide sol

[0016] (1) Preparation of titanium dioxide sol: Hydrolyze titanium alkoxide (such as tetraisopropyl titanate, or tetrabutyl titanate or others) under the condition of acidic pH2 The solid content is 0.1~5.0wt% (weight volume percentage).

[0017] 2. Pretreatment of the surface of polymethyl methacrylate material

[0018] There are two methods for pretreatment of the surface of polymethyl methacrylate materials:

[0019] (1) Sulfonation method: Mix concentrated sulfuric acid and distilled water at a volume ratio of 5:1 to 1:1, then cool down, immerse the polymethyl methacrylate material in the solution for 1s to 10s, then take it out quickly, and wash it with distilled water The residual liquid on the surface should be dried for later use.

[0020] (2) Plasma treatment: put the polymethyl methacrylate material into a radio frequency plasma generator, and use O with a purity of 99.999% 2 RF plasma, the ...

Embodiment 1

[0025] Embodiment 1: the preparation of titania sol

[0026] Add 1.1 milliliters of concentrated nitric acid (68%) into 150 milliliters of deionized water to make a uniform solution, slowly drop 12.5 milliliters of tetraisopropyl titanate into the acidic aqueous solution under vigorous stirring, and hydrolyze the obtained suspension containing white precipitate Stirring was continued at 40 °C until the white precipitate dissolved to form a homogeneous transparent sol. Put the sol into a dialysis membrane bag and perform dialysis treatment with 2 liters of deionized water, and change the water every 12 hours until the final pH value of the dialysis water is 3.0. The sol was taken out from the dialysis bag to prepare a titanium dioxide sol with a concentration of about 2.5% (percentage by weight and volume).

Embodiment 2

[0027] Embodiment 2: PMMA material surface TiO 2 Preparation of base nanofilms

[0028] First pretreat the PMMA material according to the sulfonation method, that is, first mix the concentrated sulfuric acid and distilled water in a volume ratio of 2:1 and then cool it, then immerse the PMMA in the solution for 2 seconds, then take it out, and wash the residual liquid on the surface with distilled water ,dry.

[0029] The above-mentioned pretreated PMMA is put into a screen, and the screen is put into the TiO prepared in Example 1. 2 In the sol, pull it out at a speed of 1cm / min, place it in a radio frequency plasma generator after drying, and use O 2 (O 2 Purity is 99.999%) radio frequency plasma for surface post-treatment, radio frequency power is 60W, vacuum degree is 25Pa, and treatment time is 20min. After the plasma treatment, the sample was soaked in deionized water for 36h, and then dried at 80°C or lower for 4h to obtain a TiO-coated 2 Plexiglass PMMA for photoca...

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Abstract

The invention relates to a preparation process of modified polymethyl methyl acrylate material, which comprises firstly washing PMMA in NaOH and acetone solution in turn for 2-3 times through an ultrasonic cleaner, removing grease and dirt on the surface, drying with a vacuum drying box for backup, and then directly depositing titanium dioxide precursor solution on the surface of polymethyl methyl acrylate material through the bionic film-forming technology. The technology aims to prepare self-cleaning polymethyl methyl acrylate material which has anti-aging, wear resistance surface and anti-fog and sterilization through combining with the characteristics of polymethyl methyl acrylate and titanium dioxide, and utilizing the titanium dioxide characteristics of wear resistance, absorbing ultraviolet light, and sterilization and antibiosis and dirt-preventing and self-cleaning on the surface under the irradiation of lights, thereby expanding application ranges.

Description

[0001] The patent application for this invention is April 14, 2006, application number 200610018801.6, name: modified polymethyl methacrylate material and its preparation method. technical field [0002] The invention relates to a preparation method of a modified polymethyl methacrylate (PMMA) material, specifically coating a layer of titanium dioxide nano film on the surface of PMMA to improve certain properties and expand its application field. Background technique [0003] Polymethyl methacrylate (PMMA) is a very important kind of transparent polymer materials, commonly known as plexiglass. It has many excellent properties, such as good chemical stability, balanced physical and mechanical properties, good processing performance, weather resistance, electrical insulation, excellent optical properties, light transmittance is more than 10% higher than ordinary inorganic glass, and light weight Toughness, etc., so it is widely used in many fields such as aviation, constructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08L33/12
Inventor 付贤智翁景宁苏文悦王绪绪刘平戴文新王柿超
Owner FUZHOU UNIV
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