Application History of PVDF heat shrinkable tube Resin Coatings
DuPont in the United States in the 1940s first developed a successful polyvinylidene fluoride, the 1965 study of the successful semi-crystalline polyvinylidene fluoride resin coating, the product is called Kynar¼ ", the coating can not be cured at room temperature, sintering temperature of 240 ℃, but can be used as a high-temperature baking coating" At present, most of these coatings are used in Kynar "00" or Hylar A500 and other PVDF resins, in addition to Japan's Wu Yu Chemical industry kpolymer also belong to similar products "PVDF resin as the main component of the external wall high weather-resistant fluorine resin coating application has more than 40 years of history, In the field of construction applications with long-term use of the coating does not fade! Excellent weatherability! Good flexibility, excellent corrosion resistance and viscosity resistance characteristics of (PVDF coatings need to go through 2,301,250 ℃ baking molten film), so can not be on-site processing and preparation of large workpieces, but very suitable for small size parts of spraying and coil coating, In addition, high performance and price of the coating is not only high requirements for coatings, but also high requirements for coating technology and equipment (quality certification), in recent years has gradually developed the relevant paint and coating evaluation technical standards, such as GB5237 12,008 aluminum alloy building profile standards; gb/ T17748 12,008 building curtain wall with aluminum-plastic composite plate standard; hg/t3793 12,005 hot-melt fluorine resin (PVDF) coating standard; gb/t13448 12,006 color coated steel plate and steel belt test method, but are based on the United States AA2605 or ASCA standards on the basis of the development.
The application of PVDF heat shrinkable tube fluorocarbon resin coating in any coil coating has been quite common in foreign countries.
Fluorocarbon coating can not be used alone, its supporting primer commonly used by the cool primer, Epoxy primer and Fluorine carbon primer, its advantages and disadvantages, epoxy primer on the substrate adhesion is excellent, corrosion resistance is also more prominent, but the flexibility of this primer is poor, sensitive to ultraviolet rays, very easy to be damaged by ultraviolet rays " Coldplay Primer flexibility than epoxy primer has a great improvement, but with PVDF topcoat matching is not good, acrylic primer also has this problem, although these types of primers in the substrate adhesion, corrosion resistance and other aspects have a certain advantage, but with PVDF topcoat, supporting and weather-resistant compared to fluorine carbon primer there is a certain gap, Especially in the harsh weather conditions of the building requirements for long-term use of the occasion "fluorine carbon Primer excellent weatherability, and PVDF fluoride coating strong, but expensive"
In addition to the application of coil coatings, PVDF fluorocarbon resin coatings are also used in the way of spraying processing on a variety of metal profiles with metal substrates such as aluminum alloy galvanized steel and stainless steel, before painting, should first remove the surface of dirt, paint and oxidation, etc., can be polished, surface cleaning, chemical skimming and other processes to achieve the goal, Then a layer of chemical conversion film is formed on the surface, such as the surface treatment of aluminum alloy chromate, the surface phosphating treatment of galvanized steel or the composite treatment of oxidation drill, etc., in order to improve the bonding strength of the coating and substrate.
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