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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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

Examples

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Example Embodiment

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

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

[0031] (2) Preparation of polyvinylidene fluoride (PDVF) mixed solution: mix NN-dimethylformamide and methyl ethyl ketone, add vinylidene fluoride powder, NN-dimethylformamide and butyl ketone to the mixed solution. The molar volume ratio of ketone is 4:1, the added amount of vinylidene fluoride is 0.05g / ml, and the mixture solution of PDVF is obtained by stirring and dissolving; ...

Example Embodiment

[0035] Example 1:

[0036] (1) Dissolve tetraethylorthosilicate (2ml) in (55mL) ethanol solution, stir and maintain the temperature at 30℃, add ammonia solution and KH-570, tetraethylorthosilicate, ammonia and KH dropwise to the mixture The molar concentration ratio of -570 is 1:8:1.53. Continue the reaction. After the reaction, the mixture is dried and ground to obtain nano-silica particles;

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

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

Example Embodiment

[0041] Example 2:

[0042] (1) Dissolve tetraethylorthosilicate (2ml) in (55mL) ethanol solution, stir to maintain the temperature at 60℃, add ammonia solution and KH-570, tetraethylorthosilicate, ammonia and KH dropwise to the mixed solution The molar concentration ratio of -570 is 1:3.2:1.53, continue the reaction, after the reaction, the mixed solution is dried and ground to obtain nano-silica particles;

[0043] (2) Preparation of polyvinylidene fluoride (PDVF) mixed solution: mix 20mL of N,N-dimethylformamide and 5mL of methyl ethyl ketone, add 1.25g of vinylidene fluoride powder to the mixed solution, 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), and add the nano-silica particles at 0.024g / mL PDVF mixed solution. The mixed solution is emulsified by centrifugation and ultrasonic, and the ultrasonically dispersed solution is heated and stirred in a magnetic heating stirrer to mak...

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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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