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Modified polymethyl methacrylate materials and process for preparing same

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

Inactive Publication Date: 2006-09-27
FUZHOU UNIVERSITY
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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

[0014] 1. Preparation and chemical modification of titanium dioxide sol

[0015] (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).

[0016] 2. Pretreatment of the surface of polymethyl methacrylate material

[0017] There are two methods for pretreatment of the surface of polymethyl methacrylate materials:

[0018] (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.

[0019] (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

[0024] Embodiment 1: the preparation of titania sol

[0025] 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

[0026] Embodiment 2: PMMA material surface TiO 2 Preparation of base nanofilms

[0027] 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.

[0028] 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 discloses a modified polymethyl methacrylate and preparing method, which comprises the following steps: preparing titania sol; coating titania base nanometer film layer on the polymethyl methacrylate material; drying the surface; disposing the surface to produce transparent titania base nanometer film layer; or adapting artificial filming technique to dissolve the titania pioneer material sedimentation on the polymethyl methacrylate surface.

Description

technical field [0001] The invention relates to a modified polymethyl methacrylate (PMMA) material and a preparation method thereof, specifically coating a layer of titanium dioxide nano-film on the surface of PMMA to improve certain properties and expand its application field technology . Background technique [0002] 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, construction, transportation vehicles, medical and health care, optical components, etc. For example, in the field of construction, plexiglass is a popular building deco...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08J7/18C08L33/12
Inventor 付贤智翁景宁苏文悦王绪绪刘平戴文新王柿超
Owner FUZHOU UNIVERSITY
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