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Preparation method of durable hydrophobic anti-reflection film for evacuated collector tube surface

A vacuum heat collector tube and hydrophobic technology, which is applied in the field of preparation of a durable hydrophobic anti-reflection film on the surface of a vacuum heat collector tube, can solve problems such as durability, and achieve improved mechanical strength, high light transmittance, and large cavity volume. Effect

Active Publication Date: 2018-10-19
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to many reports above, most anti-reflection films are constructed through the modification of organic groups, but the anti-reflection films produced in this way still have durability problems for outdoor use.

Method used

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  • Preparation method of durable hydrophobic anti-reflection film for evacuated collector tube surface
  • Preparation method of durable hydrophobic anti-reflection film for evacuated collector tube surface

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) 1.73g C 4 h 6 MgO 4 4H 2 O solid was added to 38.3 g of anhydrous CH 3 OH solvent, stirred until the solid was completely dissolved, as solution A. Add 0.645g HF solution (mass fraction is 40%) to 9.3g anhydrous CH 3 OH, mixed well, as solution B. Then solution B was added dropwise to solution A to obtain a mixed solution. Finally, the mixed solution was transferred to a polytetrafluoroethylene hydrothermal reaction kettle, and after solvothermal reaction at 240° C. for 10 h, the solution was cooled and taken out. Finally, Mg(OH) with a hollow rod-like structure is obtained 2-x f x particle sol.

[0019] (2) to the Mg(OH) prepared in step (1) 2-x f x Add 2 mL of oxalic acid solution with a concentration of 0.01 mol / L as a catalyst in the sol, and use Mg(OH) 2-x f x Methyltriethoxysilane (MTES) solution was added dropwise to MTES at a molar ratio of 1:0.8 for hydrolysis reaction. During hydrolysis, the pH should be adjusted to keep it at 4, and aged for ...

Embodiment 2

[0022] (1) 1.73g C 4 h 6 MgO 4 4H 2 O solid was added to 38.3 g of anhydrous CH 3 OH solvent, stirred until the solid was completely dissolved, as solution A. Add 0.645g HF solution (mass fraction is 40%) to 9.3g anhydrous CH 3OH, mixed well, as solution B. Solution B was then added dropwise to solution A. Finally, the mixed solution was transferred to a polytetrafluoroethylene hydrothermal reaction kettle, and after solvothermal reaction at 240° C. for 14 hours, the solution was cooled and taken out. Finally, Mg(OH) with a hollow rod-like structure is obtained 2-x f x particle sol.

[0023] (2) to the Mg(OH) prepared in step (1) 2-x f x Add 2 mL of oxalic acid solution with a concentration of 0.01 mol / L as a catalyst in the sol, and use Mg(OH) 2-x f x Methyltriethoxysilane (MTES) solution was added dropwise to MTES at a molar ratio of 1:1 for hydrolysis reaction. During hydrolysis, the pH should be adjusted to keep it at 5, and aged for 10 days after hydrolysis. ...

Embodiment 3

[0026] (1) 1.73g C 4 h 6 MgO 4 4H 2 O solid was added to 38.3 g of anhydrous CH 3 OH solvent, stirred until the solid was completely dissolved, as solution A. Add 0.645g HF solution (mass fraction is 40%) to 9.3g anhydrous CH 3 OH, mixed well, as solution B. Solution B was then added dropwise to solution A. Finally, the mixed solution was transferred to a polytetrafluoroethylene hydrothermal reaction kettle, and after solvothermal reaction at 240° C. for 16 hours, the solution was cooled and taken out. Finally, Mg(OH) with a hollow rod-like structure is obtained 2-x f x particle sol.

[0027] (2) to the Mg(OH) prepared in step (1) 2-x f x Add 2 mL of oxalic acid solution with a concentration of 0.01 mol / L as a catalyst in the sol, and use Mg(OH) 2-x f x Methyltriethoxysilane (MTES) solution was added dropwise to MTES at a molar ratio of 1:0.6 to carry out hydrolysis reaction. During hydrolysis, the pH needs to be adjusted to keep it at 6, and aged for 20 days afte...

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Abstract

The invention discloses a preparation method of a durable hydrophobic anti-reflection film for an evacuated collector tube surface. The method utilizes magnesium acetate tetrahydrate and hydrofluoricacid as raw materials to synthesize Mg(OH)2-xFx particle sol with a hollow rod structure by a solvothermal method, and then a hydrolysis product of Mg(OH)2-xFx and MTES is gelled through hydroxyl group condensation to obtain a CH3-SiO2-MgF2 composite particle sol. A layer of anti-reflection film is coated on the surface of glass with a light transmittance being 92% by a dipping and pulling method.After calcination at a temperature of 350 DEG C or lower, the obtained anti-reflection film has an average light transmittance of 98% or more in a visible light range and a contact angle of 133 degrees. After the anti-reflection film is irradiated for 1000 hours under 150W ultraviolet light, the average light transmittance can still be maintained 98% or more, and the contact angle can still be maintained a hydrophobic state of 120 degrees or above.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, in particular to a method for preparing a durable hydrophobic anti-reflection film on the surface of a vacuum heat collecting tube. Background technique [0002] The improvement of solar photoelectric and photothermal conversion efficiency has always attracted the attention of people in the field of optical thin film materials, and antireflective films play a vital role in solar thermal power generation and new energy photovoltaic power generation technologies. Therefore, in recent years, the preparation technology of anti-reflection films has achieved rapid development, which can almost meet the needs of various fields, but in the actual use process, anti-reflection films still have deficiencies. Studies have shown that the vacuum heat collector used outdoors can effectively increase the photoelectric conversion efficiency by 17% under the condition of adding anti-reflection film, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/00
CPCC03C17/009
Inventor 陈若愚郝丽琴王红宁刘小华
Owner CHANGZHOU UNIV
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