Due to long-term exposure to the atmosphere, the exterior wall coating will be subject to long-term repeated changes of natural environment such as wind, sun, salt spray corrosion, rain, cold and hot changes, and the coating is prone to cracking, pulverization, peeling, discoloration and other phenomena, which makes the coating lose its original decorative protection function. Especially in some cities in the south, the water and soil are more acidic, and acid rain will occur in heavy industrial areas, which will cause strong corrosion to coatings. So whether it is material selection or construction is very important, of course, the most important is the quality of the paint itself.
According to Xiaobian, the construction process may also lead to the fall off of exterior wall coating. If the construction team is in a hurry for the construction period, and the water content of the new wall or base course is not completely dried, it shall be covered and painted immediately. When the base course is dried with air, there will be contraction cracks, or the thickness of the plastering of the base course for the construction of the outer wall will be uneven, uneven contraction will be generated, there will be hollowing cracks in the paste materials, and the construction will form cavities, etc. In this way, as long as the temperature changes, the cement will expand and contract, which will cause blistering, fading, poor bonding, mold and other serious consequences. In addition, with the drying and volatilization of water vapor, it is difficult to avoid the free alkali evolution, which will lead to peeling off of the coating film.
The low quality level of domestic coatings has seriously affected the effect of exterior wall decoration. At the same time, the low-quality coatings are mixed into the market due to the low price bidding behavior of many development enterprises, which affects the development of the whole industry.
Technical innovation of coating products in response to market changes
Although the current situation is worrying, the brand enterprises of coating industry are still making unremitting efforts to guide the market. High quality coating should have the characteristics of decoration, weather resistance, stain resistance, water resistance, mildew resistance, etc.
At present, the variety and structure of coatings in the world are developing towards VOC reduction, among which waterborne coatings are one of the development directions. Improving the quality of waterborne coatings and developing new varieties are important links to consolidate and develop waterborne coatings. At present, in addition to increasing efforts and scientific research on functional coatings with low quality, such as fire, poison, insect, insecticidal and heat insulation, we should also intensify research and solve the difficulties and new problems in building decoration. Composite technology will be an effective way to improve and meet various functions.
As an ideal performance of coating, not only to protect and beautify the substrate, but also to give the substrate itself can not have the special function, using some new substrate can make the coating obtain a very amazing high-performance, high value-added, high-level effect, such as high weather resistant fluororesin coating, used in the construction of good results.