a coating process that keeps the roof cool

Environmentally friendly green architectural design is becoming increasingly popular in North America. However, green design initiatives come in many different ways. One of the most attractive designs from the homeowner's point of benefit is the use of cool roof technology to reduce the air conditioning usage of the building by reducing the temperature of the roof. Research by several national laboratories and other research institutes has shown that focusing on cool roof technology is an effective way to achieve national energy savings, which can reduce the energy requirements of buildings and residential areas.

Many cities in the United States are developing cool roofing technologies and introducing the need for cool roofs into their building codes or working with large companies on cool roof projects. The concept of a cool roof was thus adopted by the National Green Building Promotion Organization and Industrial Projects, such as the Energy Conservation Star Program of the Environmental Protection Agency and the Cold Metal Roof Alliance. It can be seen that the cool roof concept is currently a hot topic in the construction industry and the coatings industry.

PVDF (polyvinylidene fluoride) coatings have been tested in Florida for decades and have shown superior performance, including optimized cooling roof technology by maintaining the TSR value of the coating. Most conventional roofing materials absorb a certain amount of solar radiation, causing an increase in surface temperature. This energy is not only transmitted to the house, but it accelerates the aging of the roofing material. A long-term effective cooling roof solution must consider two issues: it must be able to effectively reduce the temperature of the roof surface in hot weather, and maintain performance over a long period of use without additional maintenance.

The most weather-resistant coatings for metal roofing and other architectural surfaces are PVDF resin coatings that have excellent UV and chemical resistance for superior gloss and color stability, as well as superior chalk resistance. .

The first fluorocarbon coating resin for construction was commercialized in 1965, and since then, thousands of buildings around the world have been coated with this fluorocarbon coating using a roll or spray process. Since the 1960s, this fluorocarbon-coated test panel has been exposed to the South Florida Exposure Test Center for nearly 40 years, still retaining its original color. Most commercial PVDF coatings are non-aqueous and require short-term baking at high temperatures, so PVDF coatings are typically applied to metal substrates such as metal coils or aluminum sheets. In order to obtain a practical coating with super weather resistance, PVDF coatings usually use the most durable inorganic pigments and a small amount of monomeric acrylic resins such as methacrylic resins and ethacrylic resins. Acrylic resins are used to enhance some of the properties of the coating, such as the dispersibility of the pigment and the adhesion of the coating, while pure PVDF does not have these properties due to its chemical inertness. Since the acrylic resin used is thermodynamically compatible with PVDF, the interface at the interface after baking is actually a network interpenetrating alloy structure.

Since this network interpenetrating structure is thermoplastic and thermodynamically stable, and the main substrate is photochemically inert PVDF, PVDF resin coatings are still extremely protective for decades, even in high temperature roof environments. . Conventional cross-linked network structures of resins, such as polyester, are exposed to the sun, humidity and high temperatures, especially in hot weather. The roof-facing roof temperature can reach 80 ° C or higher, which accelerates. Degradation of the crosslinked network structure resin leads to a reduction in gloss of the coating, pulverization, and even failure of coating properties. Total Solar Reflectance and Cool Roof Technology The amount of heat that accumulates on the surface of a building under solar radiation is determined by two physical properties: long-wave thermal radiation and reflectivity. Thermal radiation is a measure of the radiant heat of a hot object. Generally, metals have low heat radiation, while polymer coatings have high heat radiation, including PVDF coatings. Reflectance is the ratio of heat that is reflected and scattered without being absorbed. The reflectivity depends on many factors that are influenced by the coating formulation and construction method. A common calculation of solar reflectivity refers to all solar reflectance, or TSR6. In general terms, TSR is the ratio of daylight that is reflected off the coating.

The TSR determines the energy contained in the solar spectrum, including the energy stored in the near-infrared region of half the solar radiant energy. Generally, the higher the TSR, the better the formation of a cool roof. Effect of Pigments on Cool Roof Properties As mentioned earlier, the choice of pigment has a large effect on the TSR value of the roof coating. However, it is clear that the TSR values ​​between different black pigments are also very different. This difference is caused by the difference in reflectivity of the pigment in the infrared region. After observation, it was found that other colors also had similar TSR differences. For each color system, the pigment with the highest TSR value is best suited for coatings on cool roofs.

Of course, it has been proven that the pigment itself is also sufficiently weatherable. For this reason, high-quality roofing coatings use the most durable inorganic pigments almost without exception. This formulation choice ensures that the long-term stability of the coating color is as long as the stability of the coating resin. Since black paint absorbs too much solar energy in the visible region, the use of high TSR pigments can make it a significant benefit in terms of heat reduction. For black pigment coatings with high TSR values, the elevated temperature is only slightly higher than the white coating template. Conversely, a black coating with a low TSR value, the elevated temperature in the infrared cabinet reaches 70 ° C, close to the heat of boiling water. The TSR values ​​of a series of aqueous PVDF coatings of different colors were also investigated. Test samples have been exposed in Florida for 5 to 6 years. The reflection values ​​of these samples without cleaning are reduced by about 3%, and if they are slightly cleaned, the reflection value is reduced by less than 3%. At the same time, these samples still maintain a good color and luster. Based on these test data, a variety of light and dark waterborne PVDF coatings can meet the performance requirements of cool roof coatings in various locations, including TSR retention values. Zheng Min

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Performance characteristics:
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Generally 3 to 5 years
Technical index:

Epoxy Flat Ground And Mortar Floor

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