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Definition of durability of color coated board

Color coated board products based on light, beautiful, convenient construction, not for the second decoration and many other advantages, in some developed countries have penetrated into the application of various fields. In China, with more than 20 years of color coated plate production technology to improve and develop in the general industrial construction industry has also been widely promoted and applied, and in high-grade office buildings, residential and other areas are gradually promoting the application. For example, more and more respected green energy-saving concept of high-grade office buildings or civilian residential, in the design and construction of special attention to wall insulation, in order to protect the insulation wall material is not damp, to maintain its thermal insulation effect and mechanical strength, it must There are external window sill board and daughter wall cover, these auxiliary materials on the wall insulation and building energy-saving effect to play an indirect and effective protection. Compared with the traditional marble, wood, plastic buckle plate, aluminum plastic, aluminum alloy, stainless steel and other windowsill materials, color coated steel plate is undoubtedly colorful in color, energy saving, environmental corrosion and aging of the construction and other aspects of more cost-effective and other comprehensive advantages The Compared with the general temporary buildings and industrial plants, these high-end buildings have a longer service life (civil construction design requirements of the main building materials warranty for 70 years), personalized design more complex, people on the building beautiful and durable expectations Higher, the performance of building materials is undoubtedly higher than the average demand for building blocks.


Definition of durability of color coated board


The service life of the color coated plate is not strictly defined. It is generally understood that the corrosion resistance of the substrate and the weatherability of the organic coating under the actual application conditions, the uniform performance of the two performance test limits. Laboratory simulation accelerated aging test and outdoor hanging film exposure as the primary means of assessing life, but can only speculate on its probabilistic life in a given environment. Life is divided into three grades: decorative life, maintenance life, extreme life.


According to GB / T12754 "color coated steel plate and strip" national standard description, color coated substrate (hot-dip galvanized, hot-dip aluminized zinc, hot-dip galvanized aluminum, etc.) according to the use of the environment of different corrosive grade Recommended, such as hot galvanized substrate according to the corrosive environment of low, medium and high were given the recommended weight of zinc layer: 180,250,280g / m²; front coating (primer + topcoat) recommended thickness of not less than 20μm The


According to GB / T12754 recommended substrate and coating structure design, different topcoat coating of color coated products, durability test test time and the corresponding warranty as shown in Table 1, color coated board production enterprises to give the longest written commitment Use warranty period of 20 years, of course, the warranty period should be understood as the decorative life, that is, color insurance new period. In fact, the use of buildings for more than 40 years abroad is sufficient to confirm that although the decorative life of color coated board is only 15 to 20 years, but the maintenance life of the plate at least up to 40 years.


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