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Preparation method of PDMS super-hydrophobic flexible membrane capable of being opened and closed in transparent/opaque state

A transparent state, water-flexible technology, applied in the field of preparation of super-hydrophobic flexible smart window materials, can solve the problems of reduced light scattering, decreased light transmittance, enhanced light scattering, etc., and achieves low production cost, good flexibility, and optical stability. Good results

Active Publication Date: 2021-06-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rough surface structure will enhance light scattering and decrease light transmittance
When the infiltration of the solvent causes the surface roughness to decrease, it will reduce the light scattering effect and increase the light transmittance.

Method used

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  • Preparation method of PDMS super-hydrophobic flexible membrane capable of being opened and closed in transparent/opaque state
  • Preparation method of PDMS super-hydrophobic flexible membrane capable of being opened and closed in transparent/opaque state
  • Preparation method of PDMS super-hydrophobic flexible membrane capable of being opened and closed in transparent/opaque state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: a kind of preparation method of the PDMS superhydrophobic flexible film that can switch in transparent / opaque state, specifically comprises the following steps:

[0036] 1. Prepare the solution: prepare a sodium acetate ethanol solution with a concentration of 2wt%, stir well to dissolve the sodium acetate. The PDMS precursor solution was prepared by mixing the basic components and the curing agent in a mass ratio of 10:1, stirred evenly, and left to stand for 30 minutes until all the bubbles were eliminated before use. The curing agent is commercially available PDMS supporting SYLGARD 184 curing agent.

[0037] II. Spraying: Use a spray gun to evenly spray the prepared sodium acetate ethanol solution onto the glass substrate to obtain a sodium acetate porous template; the size of the nozzle is 0.2mm, and the distance between the nozzle and the substrate is 7cm. The substrate temperature was controlled at 40°C during spraying. The thickness of the spraye...

Embodiment 2

[0043] Embodiment 2: a kind of preparation method of the PDMS superhydrophobic flexible film that transparent / opaque state can switch, specifically comprises the following steps:

[0044] 1. Prepare the solution: prepare a sodium acetate ethanol solution with a concentration of 2wt%, stir well to dissolve the sodium acetate. The PDMS precursor solution was prepared by mixing the basic components and the curing agent in a mass ratio of 10:1, stirred evenly, and left to stand for 30 minutes until all the bubbles were eliminated before use.

[0045] II. Spraying: Use a spray gun to evenly spray the prepared sodium acetate ethanol solution onto the glass substrate to obtain a sodium acetate porous template; the size of the nozzle is 0.2 mm, and the distance between the nozzle and the substrate is 7 cm. The substrate temperature was controlled at 70°C during spraying. The thickness of the sprayed layer is controlled at 30-50 microns.

[0046] Ⅲ. Curing: Pour the prepared PDMS pre...

Embodiment 3

[0048] Embodiment 3: a kind of preparation method of the PDMS superhydrophobic flexible film that can switch in transparent / opaque state, specifically comprises the following steps:

[0049] 1. Prepare the solution: prepare a sodium acetate ethanol solution with a concentration of 5wt%, stir well to dissolve the sodium acetate. The PDMS precursor solution was prepared by mixing the basic components and the curing agent in a mass ratio of 10:1, stirred evenly, and left to stand for 30 minutes until all the bubbles were eliminated before use.

[0050] II. Spraying: Use a spray gun to evenly spray the prepared sodium acetate ethanol solution onto the glass substrate to obtain a sodium acetate porous template; the size of the nozzle is 0.2 mm, and the distance between the nozzle and the substrate is 7 cm. The substrate temperature was controlled at 70°C during spraying. The thickness of the sprayed layer is controlled at 30-50 microns.

[0051] Ⅲ. Curing: Pour the prepared PDMS ...

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Abstract

The invention discloses a preparation method of a PDMS super-hydrophobic flexible membrane capable of being opened and closed in a transparent / opaque state, which comprises the following steps: firstly, spraying a sodium acetate ethanol solution onto a glass substrate by adopting a spraying method to obtain a sodium acetate porous coating, then coating the surface of the porous coating with a PDMS precursor solution, heating and curing after the PDMS precursor solution fully permeates into holes of the coating, and further peeling off the cured sodium acetate / PDMS composite membrane from the glass substrate, and soaking the cured sodium acetate / PDMS composite membrane in water to dissolve sodium acetate so as to obtain the flexible membrane with the graded micro-convex structure on the surface. The flexible membrane not only has the surface super-hydrophobic property and can be adhered to the surfaces of most objects to endow the surfaces with the super-hydrophobic property, but also can be opened and closed in the transparent / non-transparent state through an ethanol solvent, and has wide application prospects in the fields of counterfeiting prevention, indoor privacy partition, lighting decoration and the like. The preparation method disclosed by the invention has the advantages of simplicity in operation, environment friendliness, capability of realizing large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of superhydrophobic flexible smart window materials, and in particular relates to a preparation method of a PDMS superhydrophobic flexible film whose transparent / opaque state can be switched. Background technique [0002] Smart window materials are a new type of optical functional materials with dynamically adjustable light transmittance. They have broad application prospects in the fields of building energy saving, advertising decoration, commodity anti-counterfeiting, and privacy protection. Among the smart window materials that have been reported so far, the means to control light transmittance mainly include electric field, magnetic field, light, temperature, humidity, mechanical force, etc. Due to the complex preparation process, high cost, and insufficient performance stability of such smart window materials, their actual production and application are limited. As a special control meth...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L83/04
CPCC08J5/18C08J2383/04
Inventor 卢学刚温小翔魏超萍刘宇婷
Owner XI AN JIAOTONG UNIV
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