Self-cleaning hydrophilic composite material and preparation method thereof

A composite material and self-cleaning technology, applied in the field of self-cleaning materials, can solve the problems of short superhydrophilic validity time, single function, and inability to have both superhydrophilicity at the same time, and achieve extended validity time and simple and controllable process. Effect

Active Publication Date: 2014-05-14
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the technical problem that the functional film layer on the surface of the self-cleaning glass in the prior art has a single fun

Method used

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  • Self-cleaning hydrophilic composite material and preparation method thereof
  • Self-cleaning hydrophilic composite material and preparation method thereof
  • Self-cleaning hydrophilic composite material and preparation method thereof

Examples

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Example Embodiment

[0028] The present invention also provides a preparation method of the self-cleaning hydrophilic composite material, including the following steps:

[0029] S10. Adsorb and wrap the composite polyelectrolyte on the surface of the negatively charged PS spherical nanoparticles through electrostatic adsorption, and then immerse them in a suspension of composite particles, and continue to adsorb and wrap the composite particles on the surface of the composite polyelectrolyte; the composite particles are cores Shell-coated structure, where the core material is SiO 2 Nano particles, shell material is TiO 2 , Shell material TiO 2 The particle size is smaller than the nuclear material SiO 2 Particle size

[0030] S20, alternately repeat the steps of wrapping and adsorbing composite polyelectrolyte and composite particles in step S10 for 1-5 times to obtain a suspension system in which several layers of composite polyelectrolyte and several layers of composite particles are alternately adsor...

Example Embodiment

[0048] Example 1

[0049] (1) Add 1wt% of negatively charged PS spherical nanoparticles aqueous suspension (PS particle size: 50nm) to PDDA and PSS aqueous solutions with an equal volume concentration of 2mg / mL to make PS spherical nanoparticles electrostatically adsorb one layer in turn PDDA and a layer of PSS are then concentrated by vacuum evaporation to form a first suspension with a composite polyelectrolyte layer (that is, the first coated PS) and a content of 1% by weight.

[0050] (2) Use the following method to prepare SiO 2 / TiO 2 Core-shell composite particle suspension: ① Based on the nano-silica (1115, 15%, 4nm) of Nalco, USA, add deionized water to adjust the mass fraction of silica to 1%, and adjust the pH of the sol 2.5; ②, under stirring conditions, for every 100 parts by mass of the above SiO2 sol, slowly drop 2.5 parts by mass of ethyl orthosilicate. After the addition is complete, stir for 1 hour, and then add 5 parts by mass of titanic acid. Tetrabutyl ester; ...

Example Embodiment

[0056] Example 2

[0057] The self-cleaning hydrophilic composite glass S20 of this embodiment is prepared by the same steps as in embodiment 1, except that:

[0058] In step (1), the PS particle size is 100nm, the PS content in the PS spherical nanoparticle aqueous suspension is 2wt%, and the volume concentration of the PDDA aqueous solution and the PSS aqueous solution are both 3mg / mL;

[0059] In step (2), in the composite particle suspension, SiO 2 / TiO 2 The particle size of core-shell composite particles is 7nm, of which SiO 2 The particle size is 5nm, TiO 2 The particle size is 1nm;

[0060] In step (3), alternately repeat the electrostatic adsorption of polyelectrolyte in step (1) and step (2) once each;

[0061] In step (4), the volume concentration of the PDDA aqueous solution and the PSS aqueous solution are both 3 mg / mL, and the number of layers that alternately adsorb the PDDA layer and the PSS layer on the surface of the glass substrate is 3;

[0062] In step (5), the immer...

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Abstract

The invention provides a self-cleaning hydrophilic composite material and a preparation method thereof, wherein the self-cleaning hydrophilic composite material comprises a transparent substrate and a composite film positioned on the transparent substrate surface; the composite film comprises hollow microspheres with cavities therein, a spherical shell material of the hollow microspheres is a composite particle; the composite particle is a core-shell coating structure, a core material is SiO2 nano particle, a shell material is TiO2, the particle size of the shell material TiO2 is less than that of the core material SiO2. By improving a film structure on the basis of a microscopic structure, the self-cleaning hydrophilic composite material simultaneously has ultra-hydrophilic antifogging, anti-microbial and dustproof effects, and the time of the ultra-hydrophilic effectiveness is prolonged.

Description

technical field [0001] The invention belongs to the field of self-cleaning materials, in particular to a self-cleaning hydrophilic composite material and a preparation method thereof. Background technique [0002] At present, there are mainly two methods to solve the problem of fogging on the surface of glass products in the prior art: one is to prepare superhydrophilic self-cleaning thin film glass, and the other is to prepare superhydrophobic self-cleaning thin film glass. The super-hydrophobic film has the lotus leaf effect, and the tiny water droplets on the film can automatically gather into large water droplets. When the water droplets are large enough, they will detach from the surface of the film under the action of gravity of the water droplets themselves or external forces such as wind blowing, so that the glass surface will not be attached by water droplets; That is, the water droplets on the surface of the superhydrophobic film can only be removed by its own grav...

Claims

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Application Information

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IPC IPC(8): C03C17/23
Inventor 黎宪宽周维孙永亮赵严帅
Owner BYD CO LTD
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