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Core-shell structure hybrid sol with photocatalysis characteristic, and preparation and application thereof

A core-shell structure, photocatalytic technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, biocide-containing paints, etc., can solve practical and economic defects, high cost, energy waste and other problems, to achieve the effects of high crystallinity, simple reaction conditions and excellent photocatalytic performance

Active Publication Date: 2017-05-10
FUZHOU MINGGU NANOMETER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been disclosed in the existing conventional technology that high-temperature treatment is used for inorganic substrates (tiles, glass, stone, hydrophilic concrete, metal plates, etc.), but the cost is high and energy waste is serious; organic substrates (paint, PVC, etc.) ) using isolation layer technology (such as Chinese patent 200710071104.1), that is, using inorganic or organic materials to isolate and pretreat the surface layer, and then coating a photocatalyst coating to avoid photocatalyst damage to the organic coating. This method can better protect The durability of the paint is used, and the anti-fouling and self-cleaning performance of the photocatalytic sol can be fully utilized, but this method requires two constructions, which has defects in practicability and economy

Method used

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  • Core-shell structure hybrid sol with photocatalysis characteristic, and preparation and application thereof
  • Core-shell structure hybrid sol with photocatalysis characteristic, and preparation and application thereof
  • Core-shell structure hybrid sol with photocatalysis characteristic, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of aqueous titanium peroxide precursor (PTC):

[0038] 1) Put 40g of TiCl in an ice-water bath 4 Drop into 1000mL of vigorously stirred pure water at a rate of 1 drop / s to prepare 0.2mol / L of TiCl 4 solution;

[0039] 2) Adjust the pH value of the solution to 8 with ammonia water with a mass fraction of 2%, to obtain a precipitate of orthotitanic acid, and wash the precipitate with deionized water 10 times;

[0040] 3) The precipitate was dispersed in 200 mL of hydrogen peroxide solution with a mass concentration of 10% to prepare an aqueous titanium peroxide precursor (PTC).

[0041] 2. Preparation of silicone adhesive precursor: add 25mL ethyl silicate and 1.5mL nitric acid into 250mL methanol solution, disperse with 600W ultrasonic wave for 30min, and obtain a methanol solution containing ethyl silicate with pH=1, which is Silicone adhesive precursor.

[0042] 3. Preparation of core-shell structure hybrid sol: Take 100mL of the prepared silicone ad...

Embodiment 2

[0046] 1. Nano-TiO 2 Sol preparation:

[0047] 1) Add 0.1mol of TiOSO to the 4 Drop into 1000mL of vigorously stirred pure water at a rate of 1 drop / s to prepare 0.1mol / L TiOSO 4 solution;

[0048] 2) Adjust the pH value of the solution to 8 with ammonia water to obtain a precipitate of orthotitanic acid, and wash the precipitate with deionized water 10 times;

[0049] 3) Disperse the precipitate in 400mL hydrogen peroxide solution with a mass concentration of 30% to prepare an aqueous titanium peroxide (PTC) solution;

[0050] 4) Dilute the above-prepared PTC solution with water to 1000mL, raise the temperature to 80°C and keep it under reflux for 3h to prepare nano-TiO 2 The resulting sol contains a large number of incompletely reacted titanium hydroxyl groups (Ti-O-H), which makes the sol negatively charged.

[0051] 2. Preparation of core-shell structure hybrid sol: take the nano-TiO prepared above 2 Sol 200mL, add 5mL inorganic nano-SiO with a solid content of 20% ...

Embodiment 3

[0054] 1. Nano-TiO 2 The preparation of the sol is the same as in Example 2.

[0055] 2. Preparation of nano-organic microemulsion intermediates:

[0056] 1) The reaction monomers methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA), emulsifier OP-10 and pure water are prepared according to the mass ratio of 3:2:1.5:0.2:10. Emulsified mixture 600mL;

[0057] 2) Add 200mL of the above-mentioned pre-emulsified mixture to a four-neck flask equipped with a stirrer, reflux condenser, and thermometer, then add a pH adjustment buffer (sodium bicarbonate with a mass fraction of 5%) to adjust the pH to 6, and mechanically stir Disperse for 1 hour, then raise the temperature to 75°C, then add 20 mL of primer (aqueous potassium persulfate solution with a mass fraction of 5%), keep the reaction for half an hour to form seeds, then raise the temperature to 80°C, and then continuously drop the remaining pre-emulsified Mixture, and then synchronously add 40mL initiator dropwi...

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Abstract

The invention discloses a core-shell structure hybrid sol with photocatalysis characteristic, and a preparation method and application thereof. The core-shell structure hybrid sol is prepared by using a photocatalysis nanoparticle as a core and polymerizing a layer of organic polymer on the surface of the nanoparticle by an in situ polymerization method. A film coating solution prepared by the sol can directly coat the surface of an organic substrate under the normal temperature condition to form a layer of transparent thin film; through one surface, in contact with the organic substrate, of the thin film, the photocatalysis nanoparticle can be effectively adhered, and a self isolation effect is achieved, so the destroy of a nanometer photocatalyst on the organic substrate in a use process is effectively avoided; after certain UV (ultraviolet) light or sunlight irradiation, organic matters at an outermost layer can be decomposed and micronized by the nanometer photocatalyst, so that the nanometer photocatalyst is exposed, and thus the whole coating has good self cleaning and contamination resistant performance; in addition, the thin film also has the function of absorbing and isolating ultraviolet rays; the protection effects such as color retention and aging resisting on the organic substrate can be achieved.

Description

technical field [0001] The invention belongs to the technical field of coating materials, and in particular relates to a core-shell hybrid sol with photocatalytic properties and a preparation method and application thereof. The coating solution made by adding a small amount of additives to the sol can be directly coated on the surface of organic substrates such as paints and plastic sheets at room temperature, producing a self-isolation effect and avoiding the damage of the nano-titanium dioxide photocatalyst to the organic substrate during use. At the same time, it exhibits a hydrophilic effect with photocatalytic characteristics, so that the entire coating has good self-cleaning and stain resistance properties, and solves the construction problems of nano-photocatalyst sol in actual use. Background technique [0002] For exterior decorations (paints, ceramic tiles, glass, aluminum plates, plastic films, tents and cement materials, etc.), decoration is its basic function. ...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D183/04C09D183/06C09D133/12C09D5/16C09D7/12B01J31/38
CPCC09D133/12C09D183/04C09D183/06C08K3/22C09D1/00C09D5/1687B01J31/38C08K2003/2241C08K2201/011B01J35/39
Inventor 余晓伟陈锡华
Owner FUZHOU MINGGU NANOMETER SCI & TECH
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