A preparation method for durable hydrophobic anti-reflection film on the surface of vacuum heat collecting tube

A technology of vacuum heat collection tube and hydrophobicity, which is applied in the field of preparation of durable hydrophobic anti-reflection film on the surface of vacuum heat collection tube, can solve the problems of durability and other problems, and achieve the goal of improving mechanical strength, large cavity volume, and excellent self-cleaning ability Effect

Active Publication Date: 2021-01-29
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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  • A preparation method for durable hydrophobic anti-reflection film on the surface of vacuum heat collecting tube
  • A preparation method for durable hydrophobic anti-reflection film on the surface of vacuum heat collecting tube

Examples

Experimental program
Comparison scheme
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 the MTES at a molar ratio of 1:0.8 for hydrolysis. During hydrolysis, the pH should be adjusted to keep it at 4, and aged for 10 da...

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 Patents(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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