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Transparent sound-absorption film surface hydrophobic self-cleaning coating and preparation method thereof

A sound-absorbing and thin-film technology, applied in the direction of coating, etc., can solve problems such as expensive raw materials, micropore blockage on the surface of sound-absorbing film, corrosion of sound-absorbing materials, etc., to achieve expanded use environment, good hydrophobic effect, and low manufacturing cost Effect

Inactive Publication Date: 2013-09-04
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] India's A.Venkateswara Rao and others have studied the use of polymethyl methacrylate (PMMA) to prepare transparent self-cleaning films (Kavale, M. S, A.Venkateswara Rao .Applied Surface Science 2011, 258, (1), 158-162.), the static contact angle of the film can reach more than 150°C, and the light transmittance can reach more than 90% in the visible light range, and has good hydrophobicity, transparency Light effect; but applying it on the surface of porous polycarbonate sound-absorbing film will seriously block the micropores of the film, affecting its ability to absorb noise, and the raw materials are expensive
[0006] U.S. H.M. Shang et al. used tetraethyl orthosilicate as the basic silicon source to prepare nano-silica transparent self-cleaning film (H.M. Shang, Y. Wang, S.J. Limmer, T.P. Chou, K. Takahashi, G.Z. Cao, Optically transparent superhydrophobic silica-based films, Thin Solid Films, 472 (2005) 37-43.), the static contact angle of the film is above 150°, and the transparency is at It is more than 90% in the visible light range; however, in the preparation process, it needs to be modified with chlorosilane, which will cause serious corrosion to the sound-absorbing material, and the chlorosilane used is very expensive, and is not suitable for the surface of the sound-absorbing material
At the same time, the coating will seriously block the micropores on the surface of the sound-absorbing film

Method used

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  • Transparent sound-absorption film surface hydrophobic self-cleaning coating and preparation method thereof
  • Transparent sound-absorption film surface hydrophobic self-cleaning coating and preparation method thereof
  • Transparent sound-absorption film surface hydrophobic self-cleaning coating and preparation method thereof

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preparation example Construction

[0029] A method for preparing a hydrophobic self-cleaning coating on the surface of a transparent sound-absorbing film of the present invention comprises the following steps:

[0030] (1) Preparation of nano-silica particles; dissolve tetraethyl orthosilicate in ethanol solution, stir to keep the temperature at 30~70°C, add ammonia solution and KH-570, tetraethyl orthosilicate to the mixture dropwise , The molar concentration ratio of ammonia water and KH-570 is 1:3.2:1.53~1:11.2:1.53, continue to react, after the reaction is completed, the mixed solution is dried and ground to obtain nano-silica particles;

[0031] (2) Preparation of polyvinylidene fluoride (PDVF) mixed solution: mix N-N-dimethylformamide and methyl ethyl ketone, add polyvinylidene fluoride powder to the mixture, N-N-dimethylformamide and butyl The ketone molar volume ratio is 4:1, the addition amount of polyvinylidene fluoride is 0.05g / ml, stir and dissolve to obtain a PDVF mixed solution;

[0032] (3) Prep...

Embodiment 1

[0036] (1) Dissolve tetraethyl orthosilicate (2ml) in (55mL) ethanol solution, stir to keep the temperature at 30°C, add ammonia solution and KH-570, tetraethyl orthosilicate, ammonia water and KH to the mixture dropwise The molar concentration ratio of -570 is 1:8:1.53, and the reaction is continued. After the reaction is completed, the mixed solution is dried and ground to obtain nano-silica particles;

[0037] (2) Preparation of polyvinylidene fluoride (PDVF) mixed solution: Mix 20mL N,N-dimethylformamide and 5mL butanone, add 1.25g polyvinylidene fluoride powder to the mixture, stir and dissolve to obtain PDVF mixture;

[0038] (3) Add the nano-silica particles prepared in step (1) to the PDVF mixed solution in step (2), and the amount of nano-silica particles added is 0.032 g / mL of the PDVF mixed solution. The mixed solution is centrifugally emulsified and ultrasonicated, and the ultrasonically dispersed solution is heated and stirred in a magnetic heating stirrer to mak...

Embodiment 2

[0042] (1) Dissolve tetraethyl orthosilicate (2ml) in (55mL) ethanol solution, stir to keep the temperature at 60°C, add ammonia solution and KH-570, tetraethyl orthosilicate, ammonia water and KH to the mixture dropwise The molar concentration ratio of -570 is 1:3.2:1.53, and the reaction is continued. After the reaction is completed, the mixed solution is dried and ground to obtain nano-silica particles;

[0043] (2) Preparation of polyvinylidene fluoride (PDVF) mixed solution: Mix 20mL N,N-dimethylformamide and 5mL butanone, add 1.25g polyvinylidene fluoride powder to the mixture, stir and dissolve to obtain PDVF mixture;

[0044] (3) Add the nano-silica particles prepared in step (1) to the PDVF mixed solution in step (2). The amount of nano-silica particles added is 0.024 g / mL of the PDVF mixed solution. The mixed solution is centrifugally emulsified and ultrasonicated, and the ultrasonically dispersed solution is heated and stirred in a magnetic heating stirrer to make ...

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Abstract

The present invention discloses a transparent sound-absorption film surface hydrophobic self-cleaning coating preparation method, wherein nanometer silica is adopted as base particles, other polymer additives are added to improve a hydrophobic effect, and a mixed slurry is sprayed onto a porous polycarbonate sound-absorption surface. The preparation method comprises the following steps: carrying out an ultrasonic cleaning treatment on a porous polycarbonate sound-absorption film, adopting silicon tetraacetate and KH-570 as raw materials to prepare modified nanometer silica particles, mixing a certain amount of polyvinylidene difluoride, N,N-dimethylformamide and butanone according to a certain ratio to prepare a polyvinylidene difluoride mixing solution, mixing a certain amount of the nanometer silica particles and the polyvinylidene difluoride mixing solution, spraying the obtained mixed solution on the porous sound-absorption surface, and drying to form the coating. The transparent sound-absorption film surface hydrophobic self-cleaning coating has a high water contact angle, has high light transmittance, and can not block a micro-pore structure of the sound-absorption surface.

Description

[0001] The invention relates to a preparation method of a hydrophobic coating, in particular to a hydrophobic self-cleaning coating on the surface of a porous PI (polycarbonate) transparent sound-absorbing film and a preparation method thereof. Background technique [0002] With the development of modern industry and transportation, noise pollution is becoming more and more serious, and with the continuous enhancement of people's awareness of environmental protection, people's requirements for the sound environment are also getting higher and higher, so sound-absorbing materials have gradually become the focus of everyone's attention. The sound-absorbing material is based on the theory of microporous resonant sound absorption. Micropores with a diameter of 0.05-0.3 mm are pierced on a porous PI (polycarbonate) base film with a thickness of 0.05-0.3 mm. However, the surface of this sound-absorbing material is easy to The accumulation of dust will block the micropores on the poro...

Claims

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Application Information

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IPC IPC(8): C09D127/16C09D7/12C09D5/00C08J7/04C08L69/00
Inventor 熊党生王楠张维珏张荣初
Owner NANJING UNIV OF SCI & TECH
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