Fluorocarbon coating armor Baotian Xingzhou Yangtze River Bridge The earliest "fluorocarbon coating" of the 100-year life is actually born in 1938, is known as DuPont's Teflon coating, namely polytetrafluoroethylene (PTFE), A copolymer such as polyperfluoropropylene (FEP). These materials are uniquely excellent in heat resistance (180 ° C - 260 ° C), low temperature resistance (-200 ° C), self-lubricating and chemical stability, etc., and are called "corrosion-resistant, never sticky Teflon" Fluorocarbon paints are generally classified into trifluoro and tetrafluoroethylene, and tetrafluoroethylene has higher corrosion resistance. Due to the extremely high liquefaction temperature required for use, the dispersibility of the pigment is very poor, so it has only been used in the fields of non-stick pan, medical, aviation, etc., and has not entered the construction field.
It was not until 1965 that Pennwalt developed a fluorocarbon coating for building based on polyvinylidene fluoride (PVDF) (trademark Kynar 500). Since the fluorocarbon coating was commercialized, it has been seen that fluorocarbon coatings are The application prospects in the construction field, there are currently tens of thousands of buildings around the world under the protection of (PVDF) fluorocarbon coatings. Since this type of coating is still a baking type coating, although the baking temperature is much lower than that of polytetrafluoroethylene, it is about 230 ° C, so it cannot be used in the field and requires factory processing, which also restricts the further promotion of fluorocarbon coating.
Until 1982, Japan’s Asahi Glass Co., Ltd. developed a fluoroolefin-vinyl ether copolymer (FEVE) to create a room temperature curing fluororesin that can be dissolved in aromatic hydrocarbons, lipids, and ketones at room temperature, which overcomes the original fluorocarbon coating. The shortcoming of room temperature curing realizes the ideal of coating fluorocarbon coating on the construction site, and greatly expands the application field of fluorocarbon coating.
Infrared range finder refers to laser infrared range finder, which is a kind of laser range finder. Infrared rangefinder is an instrument for precision ranging with modulated infrared light. The measuring distance is generally within 150 meters, and the accuracy is about 2mm. This is the most widely used laser infrared range finder. In addition to the function of measuring distance, one can also calculate the volume of the measured object. Infrared rangefinders are widely used in topographic survey, battlefield survey, tank, aircraft, ship and artillery target ranging, measurement of clouds, aircraft, missiles and artificial satellite altitude. It is an important technical equipment to improve the accuracy of high tanks, aircraft, ships and artillery. Because the price of laser infrared rangefinder is decreasing, the industry is also gradually starting to use laser infrared rangefinder, which can be widely used in industrial measurement and control, mines, ports and other fields.
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