Talk about the construction of fluorocarbon coatings on the building walls

0 Introduction
Fluorocarbon coating originated in the United States, known for its ultra-weather resistance, wear resistance, chemical resistance and stain resistance, has become a leading level of high-grade coating products. Fluorocarbon coatings can be classified in different ways: e.g. room temperature curing and baking curing type; The earliest fluorocarbon coatings to polyfluoroethylene, polyfluoroethylene (PVDF), Teflon-based coatings, belong to the hot-melt coating, the need for high-temperature baking, hot-melt melting flat film . DuPont's Teflon coatings, for example, belong to these coatings and are mainly used in rice cookers, irons, the inner walls of high-temperature reactors, etc. The performance of this type of coating is excellent, but the construction process is extremely complex, so its scope of use is greatly limited. Until the early 1980s, asahi Nitro, Japan, was the first company to introduce a temperature-cured fluorocarbon coating. At room temperature, fluorocarbon coating is coated on various substrate surfaces by brushing, roller coating, spraying and other common coating methods, which greatly expands the application range of fluorocarbon coatings, making it possible for fluorocarbon coatings to be used in daily life.1 Fluorocarbon coatings use status
Since japan's Asahi Nitro subsidiary launched a temperature-cured fluorocarbon coatings, in the mid-to-late 1990s, China's fluorine coatings have also been greatly developed. Because fluorocarbon coatings are high-grade coatings, the price is also more expensive, often used in the city's classic buildings and major projects, which coating products and construction requirements are higher. However, there are several misconceptions about the current use of fluorocarbon coatings: first, the use of general quality coatings posing as fluorocarbon coatings; Conservation and wall treatment far from meeting the standard requirements; fourth, the relevant construction units lack construction qualifications, construction experience and construction technology; and fifth, as far as fluorocarbon coatings themselves are concerned, fluorine resins of different manufacturers, through aging-resistant accelerated testing, found that their weather resistance varies greatly. In the case of fluorocarbon coatings cured at room temperature, the construction technology is a new subject, from the early 1980s to the present, that is, nearly 30 years. At present, the biggest difficulty of construction technology is to eliminate color difference and solve the problem of coating flatness.2 fluorocarbon coatings on the construction wall
for any coating construction, the substrate is required to be "dry and clean", fluorocarbon coatings are no exception. In fact, in order to achieve the ideal construction effect, to avoid the interference caused by poor color achromia and leveling, the following factors are the key to control: substrate treatment, primer and finish reasonable matching, suitable construction technology, ideal construction tools, through the separation line to protect the well-constructed and un-constructed areas, especially for spraying construction.
According to our summary of wall construction, the following construction options can be used:
scheme 1: external wall rigid flat putty, external wall rigid glossy putty, closed primer, fluorocarbon finish
;
for the artistic effect coating system, the following construction options can be used:
scheme 3: rigid flat putty on the outer wall, rigid pull putty on the outer wall, closed primer, fluorocarbon paint;
Option 4: External Wall Rigid Flat Putty, Exterior Rigid Light Surface Putty, Exterior Rigid Embossed Putty, Closed Primer, Fluorocarbon Paint;
Option 5: High Elastic Anti-cracking Putty, Elastic PullEd Putty, Closed Primer, Fluorocarbon Finish;
Program 6: High Elastic Anti-cracking Putty, Elastic Glossy Putty, Elastic Floating Putty, Closed Paint.
table 1 for a comparison of the various programmes.
construction programs are more3 Fluorocarbon exterior coating flatness and separation seam problem
To make the post-construction fluorocarbon coating not only have excellent performance, but also has beautiful decorative effect, especially for imitation metal fluorocarbon paint, in order to be comparable with aluminum plate, we must pay special attention to the flatness of wall construction. The water content of cement walls must be less than 8% to 10%, pH < 10. Because the fluorocarbon coating itself is not breathable, if the water content of the wall is too high, the imitation metal fluorocarbon coating after construction will bubble. According to relevant experience, the flatness after putty construction is controlled in the range of 1 to 1.5 mm within the 1 m limit. In addition, for the construction of large flat exterior walls, there must be a separation seam. On the one hand, in order to facilitate the construction, to avoid large areas of uneven construction, and then can be in the construction of different areas of protection, otherwise in the spraying construction, can not form a good coating effect. The exterior wall coating with the separator seam is easy to overcome the effect of heat expansion and cold contraction and not easy to crack, and the separation seam itself is also the channel of rain and dust, which plays a very good role in protecting and cleaning the coating.4 The development prospects of fluorocarbon coatings
Because fluorocarbon coatings have been cured at room temperature, fluorocarbon coatings have made great progress in recent years, especially in the use of building walls. China's fluorocarbon coatings started late, coupled with China's economic industrialization is not high, so that the temperature-cured fluorocarbon coatings are mainly limited to metal exterior decoration. Compared with developed countries in Europe and the United States, the use of fluorocarbon coatings in China is still low, in order to achieve the service life of fluorocarbon coatings 10 to 20 years, also need high weather resistance of pigments and other support. With the rapid development of China's economy, many outdoor metal components, such as bridges, docks, station steel components on high weather resistance, high corrosion resistance requirements, and make the temperature-cured fluorocarbon coatings have a certain market demand. At present, there are a certain number of domestic enterprises to produce fluorine resin, with the growing maturity of such enterprise technology, coupled with the domestic related enterprises construction technology is becoming more perfect, I believe that fluorocarbon coating prices are more competitive, the market potential will be greater, the prospects will be broader.