The best anti-corrosion coating ---- tetrafluororesin coating
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In recent years, the fluorine chemical industry in China is growing at a rate of 15% to 20%, and together with the United States, Japan, and the European Union, it has become the world's four largest fluorine product production and consumption areas.
The market demand for domestic fluorine coatings is very strong At present, the demand for coatings in the domestic market is developing in the direction of “three highs and one low†(high decorative, high weatherability, high functionality, and low pollution), and fluorine coatings are in line with this direction of development. Emerging forces."
The foreign fluorine coating market started in the 1940s, and China's fluorine coating market did not begin to get on track until the late 1990s. In recent years, as a manufacturing factory in the world, China's industrial production is in full swing, and urban infrastructure has also developed rapidly. With government agencies and industry organizations pushing forward and other factors, in recent years, China's fluorocoating industry has shown signs of progress in many fields. The gratifying situation of development.
In the field of architectural decoration, fluorocarbon paint has become the main product of China's exterior wall coatings. In the field of aluminum curtain walls with exterior walls in Europe and America, polyvinylidene fluoride (PVDF) fluorine coatings have already been widely and successfully applied, but their resin production technology has been monopolized by a few foreign companies, resulting in a high overall cost of such curtain walls. Moreover, due to the fact that it must be affected by factors such as high-temperature solidification construction, the development of China's PVDF fluorine coating market is subject to certain restrictions. However, China's fluororesin companies are increasingly mature in the synthesis of normal-temperature-curing FEVE fluororesins using chlorotrifluoroethylene and tetrafluoroethylene as the main raw materials, coupled with the large-scale introduction of several fluororesin leading companies in Japan in recent years. With the high decorative and weather resistance of room temperature curing type fluorine coating - fluorocarbon metallic paint in China's building exterior imitation aluminum plate decoration area popular. The appearance of this product is metal-like silver gray, the cost is relatively low, and can be on-site construction, so it is used by many design institutes. With the improvement of waterborne technology in recent years, especially the emergence of fluorine-containing acrylic resin products, combined with the success of some companies in combination with thermal insulation board production, their application in the external thermal insulation field in the Chaoyang industry will become more widespread. It is expected that fluorine coatings will have a sustained and rapid growth in the field of architectural decoration.
Fluorine-based coatings have excellent weatherability. In the field of industrial anti-corrosion, they have also been able to show their talents, such as steel construction, bridges, ships, rail transit vehicles, petroleum storage tanks and pipelines, chemical facilities, and painted steel plates. At present, Japan has included the use of fluorine coatings in its bridge design and construction specifications. In recent years, China has also applied fluorine coatings to a large number of key projects such as the famous Olympic Stadium “Bird's Nestâ€, the Qinghai-Tibet Railway, and the Hangzhou Bay Cross-sea Bridge. From the trend, with the rapid development of the industrial economy and the market's further recognition of the ultra-high performance of fluorine coatings, the field of industrial corrosion will become the main battlefield of China's fluorine coating industry.
In addition, fluorine coatings have also been formed in the fields of household appliances, medical equipment and other fields. Powder coatings made of fluoropolymers such as PTFE, ETFE, PCTFE, and ECTFE can be used for non-stick coating of home appliances and anti-corrosion linings for chemical equipment.
Tetrafluororesin was first developed by Daikin Japan, and in the country, Jinan Rui Fluorine Chemical Technology Co., Ltd. has become one of the few companies in the world that can produce tetrafluororesin, and it is also the most important fluororesin in the domestic market. supplier. The difference between the tetrafluorofluororesin and the trifluorofluororesin is firstly the content of organic fluorine in the solvent soluble matter. The content of organofluorine in the solvent soluble has been regarded as an important indicator of fluorocarbon coatings. Data studies have shown that in the application of exterior wall coatings, only the fluorine content of organic fluorine in the fluororesin exceeds 35%, and it has a true self-cleaning function (using vehicle exhaust as the main source of pollution). The fluorine content of tetrafluororesin is 35%, which is much higher than that of trifluorinated organic fluorine (23%). Second, the chemical bond energy between the two is also very different. It is well known that the performance of "paint king" of fluorocarbon coatings is mainly due to its excellent chemical inertness. The source of chemical inertness lies in the chemical bond energy. The CF bond energy in the tetrafluorofluorocarbon resin is 485.6 (Kcal/mol), and the CF bond energy of the trifluorofluorocarbon resin is only 326.5 (Kcal/mol).
Solvent Selection and Proportioning: The application of room-temperature curing fluorocarbon coatings is currently mainly used for building exterior walls and steel structures, both of which are outdoor or field operations, and are affected by factors such as regional differences, seasonal differences, wind conditions, floor height, etc. In addition, the construction environment is complex, cross-fitting is more, and the influencing factors are more uncertain. In addition to ensuring the normal and reasonable deployment required by the coating, the overall evaporation rate of the solvent system must be adjusted, too fast, easy to produce flowers, and the paint film effect is difficult to develop; Too slow, it is easy to stick dust; At the same time, with the progress of society, the choice of environmentally friendly solvents has gradually become a corporate social responsibility. Therefore, the choice and ratio of solvents are very critical.
The choice of pigments: The super weather resistance of tetrafluororesins is based on the long life of more than 20 years, but not all. The choice of pigment is particularly important, whether it is the theoretical analysis of the literature, or the application of practice, inorganic pigments, or even inorganic pigments that must be treated, is the choice of fluorocarbon coatings. At present, many companies in the market are using the automatic color-adjusting system, but the resins used in the color-grading system and the universal colorants are all hidden dangers of fluorocarbon coatings.
Self-cleaning function: The realization of the self-cleaning function, the choice of tetrafluorocoating is one of the most important factors. The actual value of stain resistance (grey) in the test has reached 1%, which is really better than other resins including trifluororesin coatings. It is much superior, and it is very helpful to give evidence from the examples.
