Preparation method of external wall thermal insulation coating with self-cleaning function

Abstract

The invention discloses a preparation method of an external wall thermal insulation coating with a self-cleaning function. The preparation method comprises the following steps: adding P123 into anhydrous ethanol, stirring to dissolve P123 to obtain a template agent solution; adding zirconium nitrate and butyl titanate into the template agent solution, stirring at the room temperature for 4-6 hours, adding titanium dioxide, uniformly mixing, drying in a vacuum oven to obtain modified titanium dioxide; adding a wetting agent, a dispersing agent, a leveling agent and a defoaming agent (A) into deionized water under stirring, stirring for 10-15 minutes; adding the modified titanium dioxide, a filler, hollow glass beads and aerogel silicon dioxide, stirring for 20-25 minutes; adding pure acrylic emulsion, a defoaming agent (B), a pH stabilizer and a coalescing agent, stirring for 10-15 minutes; filtering, coating, and drying to obtain the external wall thermal insulation coating with a self-cleaning function.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of an exterior wall thermal insulation coating with a self-cleaning function. Background technique [0002] my country's construction industry is vigorously promoting building energy conservation, that is, improving the utilization efficiency of heat energy and reducing energy waste, thereby effectively improving people's living environment and saving energy. As for building energy conservation, not only need to rely on architectural design, the more important measure is the development and application of thermal insulation materials. At present, the thermal insulation performance of thermal insulation coatings on the market is generally poor, and the thermal insulation effect provided by a single coating is limited. These coatings have single functions, and these shortcomings seriously limit the application of exterior wall coatings in the mark...

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Problems solved by technology

On the other hand, in order to increase the high vacuum degree of the coating and the reflection ability of different sunlight wavelengths, the ceramic microbeads are graded and compounded, and the heat insulation layer formed has a high vacuum degree and strong heat insulation performance. Reduce the overlap of materials when forming a thinner layer, and the performance of the thermal insulation film is stable and not easy to decay. There are few reports in many literatures on exterior wall coatings that have both self-cleaning and thermal insulation properties

[0004] Chinese patent CN107868530A discloses a thermal insulation coating for building exterior walls. By combining styrene-acrylic emulsion with alkyd resin, the dried coating film has better transparency, thereby improving the reflectivity of the filler, and then improving the insulation of the coating. thermal effect, but its weather resistance and aging resistance are weak, and it is easy to age and peel after long-term exposure, which cannot guarantee the cleanliness and aesthetics of the exterior wall surface

Maurizio et al [Maurizio S, Sina G, Alberto B, etal.Adsorption and photocatalytic degradation of VOCs by perfluorinated ionomeric coating with TiO 2 Nanopowders for air purification[J].Chemical Engineering Journal,2019,361:885–896.]Internal fluoride hydrophobic layer prepared from tetrafluoroethylene, sulfonyl fluoroether vinyl, propanol, commercial titanium dioxide and anatase And the self-cleaning titanium dioxide coating of the external photosensitive layer. This material is relatively novel and has high degradation conversion efficiency, but the preparation process is relatively complicated, and the coating is only suitable for treating VOC gases such as indoors.

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