Thermochromic pavement coating with automatic temperature regulation function and preparation method thereof
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A temperature-induced discoloration and coating technology, applied in coatings, radiation-absorbing coatings, heat-sensitive coatings, etc., can solve problems such as rutting, shifting, wrapping, poor hiding power, and threats to driving safety
Active Publication Date: 2021-07-06
TONGJI UNIV
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[0002] The surface temperature of the asphalt pavement in summer is as high as 70-80°C. Under the action of traffic load, it is easy to form defects such as rutting, shifting, and wrapping, which threatens driving safety and greatly shortens the service life of the asphalt pavement.
In addition, the urban asphalt pavement absorbs solar radiation, affects the surrounding thermal environment, and aggravates the urban "heat island effect".
In winter, as the temperature drops, it is prone to brittle failure and cracking.
[0003] At present, the existing high-reflective cooling coating with fixed color can effectiv
Method used
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[0042] The preparation method of the organic reversible thermochromic pavement coating in embodiment 1 to embodiment 4 comprises the following steps:
[0043] 1) Add the water-based silicone-acrylic emulsion and rutile titanium dioxide to the mixer in proportion, and stir evenly for 10-15 minutes at a rotational speed of 100-150 rpm;
[0044] 2) Evenly mix the leveling agent, dispersant and defoamer in equal proportions;
[0045] 3) The thermochromic powder, the mixed three additives and water are added to the mixer in proportion to uniformly stir for 15-25 minutes, and the rotating speed is 150-250 rpm;
[0046] 4) Finally, the film-forming aid is added, the rotational speed is adjusted to 100-150 rpm, and the stirring is performed for 15-25 minutes.
[0047] Reflectivity testing was performed on representative Examples 1 and 2. After the coating is prepared, it is coated on an aluminum plate of 6cm×6cm, dried and cured at a room temperature of about 25°C for at least 24 ho...
Embodiment 1
[0050] Examples 1 and 2 are low brightness (brightness value is 0-40) before discoloration, medium brightness (brightness value is 40-80) after discoloration, and the high-reflection coating with the same color and fixed color is medium brightness Or high brightness (brightness value is 80-100), compared with that, the reversible thermochromic coating only improves the reflectivity in the near-infrared band while the visible band is still low, which can alleviate the light-colored coating with too high visible reflectivity The negative impact on the visual environment of the road (glare, light pollution), and at the same time achieve the purpose of effective temperature regulation.
[0051] The indoor cooling effect test was carried out on representative examples 1 and 2. The two thermochromic coatings of Example 1 and Example 2 and the high-reflection coating of the same color system and fixed color were respectively coated on the surface of the rotary compaction test piece, ...
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Abstract
The invention discloses a thermochromic pavement coating with an automatic temperature regulation function. The thermochromic pavement coating is prepared from the following raw materials in parts by mass: 18-30 parts of pigment and filler, 50-60 parts of a water-based silicone acrylic emulsion, 5-10 parts of various additives, 5-10 parts of a coalescing agent and 20-30 parts of deionized water, wherein the pigment and filler comprises the following components in parts by weight: 2-5 parts of titanium dioxide and 16-25 parts of thermochromic powder, wherein a mass ratio of the titanium dioxide to the thermochromic powder is 1: (4-10); the titanium dioxide is rutile type titanium dioxide; and the average particle size of the titanium dioxide is 0.2 [mu]m. The pavement coating disclosed by the invention can reflect more solar radiation under a high-temperature environment condition in summer, so pavement surface temperature can be effectively reduced; a pavement can absorb more solar radiation under a low-temperature environment condition in winter, so the situation that the pavement surface temperature is continuously reduced by a high-reflection coating under the low-temperature condition is avoided, and it is guaranteed that the pavement is at a proper temperature; and meanwhile, brightness before and after the color change of the coating is controlled in a medium-low brightness range, so the problems of glare, urban light pollution and the like caused by a light-color high-reflection coating can be effectively relieved.
Description
technical field [0001] The invention belongs to the field of pavement temperature regulation technology and materials, and relates to an organic reversible thermochromic coating with the function of pavement independent temperature regulation and a preparation method thereof. Background technique [0002] The surface temperature of asphalt pavement in summer is as high as 70-80°C. Under the action of driving load, it is easy to form diseases such as rutting, shifting, and wrapping, which threatens driving safety and greatly shortens the service life of asphalt pavement. In addition, the urban asphalt pavement affects the surrounding thermal environment due to the absorption of solar radiation, and also aggravates the urban "heat island effect". In winter, as the temperature decreases, brittle failure and cracking are prone to occur. [0003] The existing high-reflection cooling coatings with fixed colors can effectively reduce the road surface temperature in summer and alle...
Claims
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