Gray heat-reflecting cooling coating, application thereof in asphalt pavements, and preparation method of coating

Abstract

The invention discloses a gray heat-reflecting cooling coating, an application thereof in asphalt pavements, and a preparation method of the coating. The coating comprises, by weight, 100 parts of a water-based polyurethane polymerization emulsion, 1-20 parts of a metal oxide mixed phase pigment, 2-15 parts of a heat reflection filler, 1-10 parts of inorganic hollow micro-particles, 0.1-5 parts ofa dispersant, 1-30 parts of a flatting agent, 0.1-5 parts of a defoaming agent, 1-10 parts of a leveling agent, 3-20 parts of a plasticizer, 0.2-6 parts of an anti-sagging agent and 0.05-2 parts of agel. The gray heat-reflecting cooling coating can reflect 80% or above of near-infrared lights, can be applied to the surfaces of pavements, house buildings and various steel structures, and can reduce the temperature by 10-20 DEG C in summer. When the coating is used for asphalt pavements, the pavement temperature can be greatly reduced, and damages such as ruts and burst caused by high temperature are reduced; and the coating is especially used for urban main roads, the urban heat island effect can be effectively relieved, and the living environment is greatly improved.

Description

technical field [0001] The invention relates to a gray heat-reflecting cooling paint and its application and preparation method on asphalt pavement. In particular, it is a gray heat-reflecting paint suitable for asphalt pavement with water-based polyurethane polymer emulsion as the film-forming base material. Background technique [0002] In recent years, extreme summer weather brought about by climate change such as global warming has become more frequent, which has also exacerbated the "urban heat island" effect. [0003] The heat-reflective pigments and hollow particles in the gray heat-reflective cooling paint can effectively reflect 80% of the near-infrared light in the light, which can greatly reduce the heat absorption of buildings and buildings, thereby reducing their surface temperature. However, high temperature weather also accelerates the damage of asphalt pavement. The gray heat-reflective coatings currently applied to the surface of buildings are not suitable ...

AI Technical Summary

Problems solved by technology

However, high temperature weather also accelerates the damage of asphalt pavement. The gray heat reflective coatings currently applied to the surface of buildings are not suitable for asphalt pavement because of their wear resistance and skid resistance can not meet the actual road use indicators.

[0004] Such as CN105925073B discloses a kind of preparation method of corrosion-resistant superhydrophobic heat reflective coating, CN105885595B discloses a kind of preparation method of self-cleaning organosilicon modified acrylic resin heat insulation reflective coating, CN105754427B discloses a kind of self-cleaning color solar heat reflective coating These coatings are applied to buildings and can have a certain cooling effect, but they are not suitable for use on asphalt pavement

[0005] CN105908590B discloses a cooling method for asphalt pavement. This method needs to mill the original pavement, spread the slurry seal and wear layer, and the construction process is complicated. It is not directly used for the existing asphalt pavement.

CN101824269B discloses a heat-reflecting paint for asphalt pavement, but the pigments used in this invention are all colored, and these colored paints will seriously affect the normal driving of the driver, and are not suitable for large-scale use on asphalt pavement

These patents are either cumbersome to implement, or not suitable for specific practical road use, and have no practical promotion value

[0006] At present, Japan is the only country where heat-reflective coatings are actually applied on asphalt pavements. However, due to the extremely high cost of coatings, the application of this technology in Japan is also very limited.

[0007] Secondly, the current domestic heat-reflective coating resin materials use acrylic resin, epoxy resin or water-based acrylic resin, and some ceramic materials and heat-reflective pigments are used as pigments and fillers. The wear resistance and skid resistance cannot meet the actual road use indicators. It is used in some building exterior walls, tanks and other places where there is basically no wear, and it is not used in the actual application of asphalt pavement.

Images