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Process for constructing superhydrophilic anti-reflection antifogging coating on polymethyl methacrylate (PMMA) substrate

A technology of polymethyl methacrylate and anti-fog coating, applied in the direction of coating, etc., can solve the problems of large energy consumption, complex device, poor timeliness, etc., achieve reduced surface tension, simple preparation process, and good durability Effect

Active Publication Date: 2014-04-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have their own limitations: method (1) needs to repeatedly spray surface-active agent on a regular basis and seems inconvenient; method (2) causes glass products to have poor abrasion resistance and heat resistance due to the use of organic substances; method ( In 3), it usually takes 7 to 10 minutes to evaporate water droplets by heating, and the timeliness is poor, and additional energy is required, and the energy consumption is large, so it is not practical; the device of method (4) is more complicated, has many components, and the cost is high (Liu Fu Shengcong, Li Yuping National Scientific and technological journal of building materials - "Glass" 2002, No. 3, 16-19)
[0008] Although self-cleaning glass is widely used, many productions actually require the use of flexible substrate materials. There have been extensive reports on the construction of anti-reflection coatings on flexible substrates, but there are few studies on the self-cleaning or anti-fog properties of flexible substrates. The present invention mainly builds a coating on a flexible PMMA substrate, and the prepared coating has good anti-reflection and super-hydrophilic properties, and has anti-fog properties at the same time

Method used

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  • Process for constructing superhydrophilic anti-reflection antifogging coating on polymethyl methacrylate (PMMA) substrate
  • Process for constructing superhydrophilic anti-reflection antifogging coating on polymethyl methacrylate (PMMA) substrate
  • Process for constructing superhydrophilic anti-reflection antifogging coating on polymethyl methacrylate (PMMA) substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Super hydrophilic anti-reflection anti-fog coating: composed of four layers of SiO with a particle size of 20-30nm 2 Spherical nanoparticle coating and a layer of mesoporous SiO with a particle size of 30-40nm 2 Spherical nanoparticles coating composition, its preparation method comprises the following steps:

[0033] (1) Add 4mL of ammonia water and 100mL of absolute ethanol into the Erlenmeyer flask at room temperature and stir for 10 minutes, then stir at 60°C for 2 minutes, add 2mL of tetraethyl orthosilicate (TEOS) dropwise under stirring, and vigorously stir at 60°C for 12 Hours, a translucent suspension was obtained containing SiO particles with a particle size of 20-30 nm. 2 Spherical small particle suspension, and dilute it with water into a suspension with a mass fraction of 0.1% to 1% for later use;

[0034] (2) Add 0.2g diethanolamine, 64mL of water, 10.4mL of cetyltrimethylammonium chloride (CTAC) (25wt%), 11.25mL of ethanol into the Erlenmeyer flask at r...

Embodiment 2

[0040] Super hydrophilic anti-reflection anti-fog coating: composed of six layers of SiO with a particle size of 20-30nm 2 Spherical nanoparticle coating and a layer of mesoporous SiO with a particle size of 40-50nm 2 Spherical spherical nano particle coating composition, its preparation method comprises the following steps:

[0041] (1) Add 4mL of ammonia water and 100mL of absolute ethanol into the Erlenmeyer flask at room temperature and stir for 10 minutes, then stir at 60°C for 2 minutes, add 2mL of tetraethyl orthosilicate (TEOS) dropwise under stirring, and vigorously stir at 60°C for 12 Hours, a translucent suspension was obtained containing SiO particles with a particle size of 20-30 nm. 2 Spherical small particle suspension, and dilute it with water into a suspension with a mass fraction of 0.1% to 1% for later use;

[0042] (2) Add 0.2g of diethanolamine, 64mL of water, 10.4mL of CTAC (25wt%), and 11.25mL of ethanol into the Erlenmeyer flask at room temperature an...

Embodiment 3

[0048] Super hydrophilic anti-reflection anti-fog coating: eight layers of SiO with a particle size of 30-40nm 2 Nanoparticle coating and a layer of mesoporous SiO with a particle size of 50-60nm 2 Nano particle coating composition, its preparation method comprises the following steps:

[0049] (1) Add 4mL of ammonia water and 100mL of absolute ethanol into the Erlenmeyer flask at room temperature and stir for 10 minutes, then stir at 60°C for 2 minutes, add dropwise 3mL of tetraethyl orthosilicate (TEOS) under stirring, and vigorously stir at 60°C for 10 minutes Hours, a translucent suspension was obtained containing SiO particles with a particle size of 30-40 nm. 2 Spherical small particle suspension, and dilute it with water into a suspension with a mass fraction of 0.1% to 1% for later use;

[0050] (2) Add 0.2g of diethanolamine, 64mL of water, 10.4mL of CTAC (25wt%), and 11.25mL of ethanol into the Erlenmeyer flask at room temperature and stir for 30 minutes, then stir...

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Abstract

The invention belongs to the technical field of nanometer material preparation, and particularly relates to a process for constructing a superhydrophilic anti-reflection antifogging coating on a polymethyl methacrylate (PMMA) substrate. The process comprises the following steps: depositing SiO2 spherical nanoparticles with grain size of about 20-50nm and mesoporous SiO2 spherical nanoparticles with grain size of about 30-60nm on the PMMA substrate via electrostatic assembling; carrying out self-assembling through electrostatic attraction of the negative charge on the surface of the SiO2 spherical nanoparticles or mesoporous SiO2 spherical nanoparticles and the positive charge of the polyelectrolyte deposited on the PMMA substrate; washing thoroughly with distilled water and drying with inert gas after each step is finished; and then coating and carrying out oxygen-plasma treatment. By adopting the process, contact angle of water on the PMMA substrate coated with the superhydrophilic anti-reflective coating is 2-3 degrees, and the transmittance of the PMMA coated with the coating is improved to 98.5% from 92.2%, and the PMMA has the favorable antifogging property.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, in particular to a method for constructing a super-hydrophilic and anti-reflection anti-fog coating on a polymethyl methacrylate (PMMA) substrate. Background technique [0002] Self-cleaning glass refers to the special treatment of ordinary glass to make the surface super-hydrophilic or super-hydrophobic, so as to achieve the effect of not affecting mirror imaging, visibility and light transmittance of the glass. [0003] Self-cleaning glass can be classified into superhydrophilic self-cleaning glass (contact angle between glass surface and water is less than 5 degrees) and superhydrophobic self-cleaning glass (contact angle between glass surface and water is greater than 150 degrees, rolling angle less than 5 degrees), according to material classification can be divided into inorganic material coating self-cleaning glass and organic material coating self-cleaning glass. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08L33/12
Inventor 贺军辉许利刚
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI