Reflective insulating architectural paint for exterior wall and preparation method thereof

Abstract

The invention discloses a reflective insulating architectural paint for an exterior wall, and belongs to the technical field of an exterior wall paint of a building. The reflective insulating architectural paint for the exterior wall comprises the following materials in parts by weight: a proper amount of water, 0.2-0.3 parts of cellulose, 0.15-0.2 parts of pH regulator, 0.5-0.7 parts of dispersing agent, 0.15-0.4 parts of wetting agent, 0.15-0.3 parts of defoamer 1, 18-25 parts of titanium dioxide, 8-12 parts of padding, 2-3 parts of far-infrared ceramic powder (1250 meshes), 0-4 parts of hollow glass microsphere (65 microns), 0-8 parts of hollow glass microsphere (50 microns), 0-6 parts of hollow glass microsphere (40 microns), 20-28 parts of elastic acrylate copolymer emulsion, 0.15-0.3 parts of defoamer 2, 1.0-2.5 parts of anti-freezing agent, 1.0-1.5 parts of coalescing agent, 0.2-0.4 parts of antiseptic and anti-mildew agent, and 1.0-1.5 parts of thickening agent. The reflective insulating architectural paint for the exterior wall disclosed by the invention can be compounded by hollow glass microspheres with different sizes according to a certain ratio. Therefore, the reflective insulating architectural paint can ensure smooth coating surface, high solar reflectivity and good fouling resistance, and also can ensure increase of volume fraction of gas in the coating, so as to greatly improve the thermal insulation performance of the coating.

Description

Technical field [0001] The invention belongs to the technical field of exterior wall coatings for buildings, and specifically relates to a reflective and thermally insulated exterior wall architectural coating. Background technique [0002] Hollow glass microspheres are closed-pore spherical particles made by a special process; because the sphere is filled with air or inert gas with low thermal conductivity, its thermal conductivity is greatly reduced, and the hollow glass microspheres are small in size. Usually in the micron level, the gas is filled in such a small confined space, and the convection heat transfer is basically negligible; in addition, the surface of the hollow glass beads is made of glass, which has a high reflectivity, which can greatly improve the reflective and thermal insulation performance of the coating; therefore, the hollow glass beads Glass microbeads are a kind of heat-insulating material that is widely used at present. There are many coatings using hol...

AI Technical Summary

Problems solved by technology

[0002] Hollow glass microspheres are closed-cell spherical particles made by a special process; because the spheres are filled with air or inert gases with low thermal conductivity, their thermal conductivity is greatly reduced, and the size of hollow glass microspheres is small. Usually micron-scale, the gas is filled in such a small confined space, convective heat transfer can basically be ignored; in addition, the surface layer of hollow glass microspheres is made of glass material, which has a very high reflectivity, which can greatly improve the reflection and heat insulation performance of the coating; therefore, the hollow glass beads Glass microspheres are a type of heat insulation material widely used at present. There are many coatings using hollow microspheres in the prior art; patent CN101691469B discloses a heat insulation building using hollow glass microspheres as heat insulation materials. Coating, by adding 10-12 parts of hollow glass microspheres with a certain gradation, the thermal conductivity of the coating can be reduced to 0.042W / m·K, which has a certain heat preservation effect, but the gradation of hollow glass microspheres is not specified in the patent. Open; patent CN101108931B discloses a kind of water-based elastic thermal insulation coating, the thermal insulation material adopted is the closed hollow glass microsphere of single size, and average particle diameter is 55 microns, and the solar reflectance of the thermal insulation coating obtained is greater than 85%, and the hemispherical emissivity is greater than 87%; patent CN101555377B discloses a thermal insulation coating, by adding 5% hollow glass beads with a size of 50 microns in the formula, a certain thermal insulation effect has been achieved; the above patents Hollow glass microspheres are used as the main heat insulation material, and have achieved a certain heat insulation effect, but most of the patents use hollow glass microspheres of a single size, even if the hollow glass microspheres of various sizes are used, it is not affected. The gradation is disclosed; although the larger hollow glass microspheres can increase the volume fraction of gas and improve the thermal insulation performance of the coating, the surface of the coating is uneven and the microscopic roughness increases, which makes the surface reflectance decrease. , poor stain resistance; while hollow glass microspheres with smaller sizes can ensure a smooth coating surface, but the gas volume fraction is usually lower, and the thermal insulation performance is also affected; therefore, hollow glass microspheres with different sizes The compounding of beads according to a certain proportion can not only ensure the smooth surface of the coating, high solar reflectance, good stain resistance, but also ensure the increase of the gas volume fraction in the coating, thereby greatly improving the thermal insulation performance of the coating