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Method for preparing nanoporous structure anti-reflection coating film on flexible substrate surface

A flexible substrate, nano-porous technology, applied in the coating and other directions, can solve the problems of low anti-reflection efficiency, inability to realize nano-porous structure, etc., to achieve the effect of increased anti-reflection efficiency, wide application range, and enhanced bonding force

Active Publication Date: 2021-09-07
浙江理工大学上虞工业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its principle is to build a nano-rough surface on the surface of the fabric, which is limited to a single-layer particle coating film, and as the coating film thickens, the upper and lower layers of particles pile up on each other, making it impossible to achieve a nano-porous structure, so the efficiency of anti-reflection is significantly low. In the nanoporous membrane of the present invention, this will be confirmed in the comparative examples of the present application

Method used

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  • Method for preparing nanoporous structure anti-reflection coating film on flexible substrate surface
  • Method for preparing nanoporous structure anti-reflection coating film on flexible substrate surface
  • Method for preparing nanoporous structure anti-reflection coating film on flexible substrate surface

Examples

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Effect test

preparation example Construction

[0069] Preparation of cross-linked hard particles and soft particles

[0070] Preparation of cross-linked hard particles: Weigh 2 grams of EGDMA and 18 grams of MMA sequentially in a beaker using an analytical balance, and stir for 5 minutes with a magnetic stirrer to mix the mixed monomers evenly; weigh them sequentially in another beaker 1 gram of SDS and 74.94 grams of deionized water were stirred with a magnetic stirrer for 5 minutes; the above-mentioned raw materials were added to a 250mL four-necked flask with a stirring paddle, a condenser tube and a nitrogen protection device, and the stirring speed was kept at 200~300 rpm / minute, the four-necked flask was placed in a water bath at 75°C, and the temperature of the system was guaranteed to be about 75°C. Dissolve 0.06 grams of KPS in 5mL of deionized water, add it to the four-necked flask, and react for 3 hours; the resulting emulsion was PMMA emulsion with a particle size of 58nm, that is, the emulsion of hard partic...

Embodiment 1

[0077] 1) Take six 25 mL beakers, respectively numbered Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ; add 1.2 grams, 1.5 grams, 1.9 grams, 2.3 grams, 2.7 grams and 3.1 grams of hard Particle emulsion, then add 0.5 g of soft particle PBA emulsion and 0.025 g of SDS to each beaker to prepare a coating emulsion with a solid content of 3% to 8%;

[0078] 2) Take six 25mL beakers and mark them with No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6 respectively. Add 0.15 g of NH4HCO3 to each beaker, and then add 5.5 g of NH4HCO3 to each of the above beakers. gram of deionized water; dissolve the NH4HCO3 in each beaker;

[0079] 3) Add the NH4HCO3 solution in No. 1 beaker to No. 1 beaker to obtain coating solution Ⅰ-1; add the NH4HCO3 solution in No. 2 beaker to No. 2 beaker to obtain coating solution Ⅱ-2; and so on, The coating liquids III-3, IV-4, V-5 and VI-6 were obtained respectively; in the process of adding the NH4HCO3 solution, it was required to drop slowly, and the emulsion was continuously stirred duri...

Embodiment 2

[0096] 1) Using the spin coating process, apply the coating solution VI-6 in Example 1 on the PET substrate, spin coating to form a film, and then place it in a blast oven at 80°C for 1 hour and take it out to obtain nano Anti-reflection coating with porous structure.

[0097] 2) The coated PET film was bent 180° multiple times, and the transmittance after bending was tested to investigate the mechanical stability of the coated film.

[0098] The planar topography figure of coating film on PET substrate in embodiment 2 is as Figure 9 Shown; PMMA / PBA mixed emulsion in embodiment 2 prepares the transmittance curve figure of coating film under different bending times as Figure 10 shown.

[0099] The scanning electron microscope on the surface of the coating film shows that the coating film coated on the PET substrate has a porous structure; the test of the optical properties of the coated glass shows that before bending, the transmittance of the PET substrate of the coating f...

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Abstract

The invention discloses a method for preparing a nanoporous structure anti-reflection coating film on the surface of a flexible substrate, which comprises the following steps: 1) After mixing the emulsion of hard particles and the emulsion of soft particles, adding (NH 4 ) 2 CO 3 or NH 4 HCO 3 Finally, the coating liquid is obtained; 2) The coating liquid is coated on the flexible substrate by the spin coating method, and the preparation is completed after drying in a blast oven. The nanoporous coating film can realize the basis of the low refractive index level of the coating film, and at the same time control the thickness of the coating film and change the wavelength of the maximum transmittance, so the scope of application is wider; in the coating film lambda max At large wavelengths, the transmittance loss of the coating film at small wavelengths is very small, only 0.45%; the soft particles form a film, on the one hand, it can bond the hard particles together, providing the structural integrity of the coating film; On the other hand, it can also enhance the bonding force between the coating film and the substrate, and improve the stability of the optical properties of the substrate when the substrate is deformed.

Description

technical field [0001] The invention relates to the technical field of anti-reflection coatings, in particular to a method for preparing nano-porous structure anti-reflection coatings on the surface of a flexible substrate. Background technique [0002] Anti-reflection coatings can effectively reduce the reflectivity of substrates to incident light and improve light utilization efficiency, so they have broad application prospects in the fields of energy, optical imaging, and military invisibility. Because the anti-reflection coating film prepared now has obvious selectivity to light waves in the visible wavelength range, the wavelength corresponding to the maximum transmittance of the anti-reflection coating film ( lambda max ) in the large wavelength range of visible light (700~800nm), the transmittance loss of the coating film in the small wavelength range (400~450nm) is very serious. Such as the antireflection coating in the document "Hierarchical Nanoporous Silica Film...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C09D133/12C09D133/08C09D7/61C08F220/14C08F222/14C08F120/18C08L67/02
CPCC08F120/18C08F220/14C08J2367/02C08L2205/02C09D133/12C09D7/61C08J7/0427C08L33/08C08F222/102
Inventor 杨雷赵强强沈一峰姜建堂
Owner 浙江理工大学上虞工业技术研究院有限公司
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