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A composite film with thermochromic, antifogging and self-repairing functions and its preparation method

A self-healing and anti-fog technology, applied in coatings and other directions, can solve the problems of less research on coatings, and achieve the effects of superior performance, wide application range, and simple preparation process

Active Publication Date: 2021-06-25
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, coatings with thermal to discoloration and anti-fog functions are less studied

Method used

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  • A composite film with thermochromic, antifogging and self-repairing functions and its preparation method
  • A composite film with thermochromic, antifogging and self-repairing functions and its preparation method
  • A composite film with thermochromic, antifogging and self-repairing functions and its preparation method

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preparation example Construction

[0045] On the other hand, an embodiment of the present invention provides a method for preparing a composite film with thermochromic, anti-fog and self-repairing functions, the method comprising the following steps:

[0046] 1) Prepare a sol solution containing silica hollow sphere nanoparticles: dissolve polyacrylic acid in ammonia water, disperse it ultrasonically, then add it dropwise in absolute ethanol, stir to obtain a mixed solution; add tetraethoxysilane dropwise into the mixed solution and stirred to obtain a sol solution containing silica hollow sphere nanoparticles;

[0047] 2) Preparation of a sol solution containing a tetravalent vanadium precursor: adding vanadium pentoxide and oxalic acid to ethanol, stirring and reacting to obtain a sol solution containing a tetravalent vanadium precursor;

[0048] 3) Prepare a sol solution containing a hydrophobized silica precursor: mix tetraethoxysilane, water, ethanol and hydrochloric acid, stir and react to obtain a silica...

Embodiment 1

[0067] Embodiment 1 contains the preparation of the sol solution of silica hollow sphere nanoparticles

[0068] Dissolve 0.2 grams of polyacrylic acid in 4.5 milliliters of ammonia water, and ultrasonically disperse for 10 minutes; then add dropwise into a container loaded with 90 milliliters of absolute ethanol, and stir for 15 minutes to obtain a mixed solution; 1.5 milliliters of tetraethoxy Silane was added dropwise to the mixed solution at a rate of 45 microliters per minute; after the dropwise addition, the resulting solution was stirred at room temperature (25° C.) for 10 hours to obtain a sol solution containing silica hollow sphere nanoparticles, wherein, The average particle diameter of silica hollow sphere nanoparticles is 38 nanometers (as figure 1 shown).

[0069] Change the quality of polyacrylic acid, when the quality of polyacrylic acid is 0.4 gram and 0.7 gram respectively, the average particle diameter of the silica hollow sphere nanoparticle in the sol solu...

Embodiment 2 2

[0071] The preparation of embodiment 2 silicon dioxide-vanadium dioxide composite film

[0072] (1) Preparation of sol solution containing silica hollow sphere nanoparticles: dissolve 0.1 to 0.3 grams of polyacrylic acid in 4.5 milliliters of ammonia water, ultrasonically disperse for 10 minutes; then add dropwise to a container loaded with 90 milliliters of absolute ethanol , stirred for 15 minutes to obtain a mixed solution; 2 to 3 ml of tetraethoxysilane was added dropwise to the mixed solution at a rate of 45 microliters per minute; Stirring was carried out for 10 hours to obtain a sol solution containing silica hollow sphere nanoparticles;

[0073] (2) Preparation of a sol solution containing a tetravalent vanadium precursor: add vanadium pentoxide and oxalic acid to ethanol, wherein the molar ratios of vanadium pentoxide and oxalic acid are 1:2.5, 1:3 and 1:4.5 respectively and stir the reaction , to obtain a sol solution containing a tetravalent vanadium precursor, dil...

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Abstract

The invention discloses a composite film with thermochromic, anti-fog and self-repairing functions and a preparation method thereof. The composite film sequentially includes a first silicon dioxide layer, a vanadium dioxide layer, a second silicon dioxide layer and a polymer layer. The invention also discloses a preparation method of the composite film, which includes: preparing four kinds of sol solutions containing hollow silica nanoparticles, tetravalent vanadium precursors, hydrophobic silica precursors and anti-fog polymers. Preparation; and then adopting methods such as pulling, drying and calcination, the four sol solutions are sequentially coated on the substrate, that is, a four-layer composite film of silica-vanadium dioxide-silica-polymer is formed on the substrate. The composite thin film of the invention has good visible light transmission performance, and has the functions of thermally induced discoloration, anti-fog and self-repairing.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation. More specifically, it relates to a composite film with thermochromic, antifogging and self-repairing functions and a preparation method thereof. Background technique [0002] Compared with traditional internal combustion engine vehicles, electric vehicles with zero tailpipe emissions (greenhouse gases and air polluting gases) are greener and are the future development direction of automobiles. However, short driving range and long battery charging time limit the current rapid development of the electric vehicle industry. Cooling, heating, windshield defogging and defrosting of automotive air conditioners consume a lot of electricity. Under normal road conditions in summer and winter, the energy consumed by the air conditioning system accounts for 18% and 53% of the total energy consumption of the car (EnergyConv.Manag., 156(2018) 515-524; Appl.Therm.Eng., 137(2018) 356-367). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/34
CPCC03C17/007C03C17/3417C03C2218/111C03C2218/113
Inventor 贺军辉姚琳
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI