Polyvinylidene fluoride (PVDF) resin mainly refers to a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and a small amount of other fluorine-containing vinyl monomers, with a relative density of 1.77-1.80 g/cm3 and a relative molecular mass of 40 -800,000, melting point: 172~180°C, thermal decomposition temperature: 350°C, wide processing temperature range from melting point to decomposition temperature, low processing temperature, both the characteristics of fluororesin and general resin, in addition to good chemical corrosion resistance Resistance, high temperature resistance, oxidation resistance, weather resistance, ultraviolet resistance, radiation resistance, and special properties such as piezoelectricity and pyroelectricity. At present, PVDF has become the second largest fluoroplastic after polytetrafluoroethylene (PTFE), and has excellent characteristics different from other fluorine-containing resins represented by PTFE. It is widely used in chemical, electronic, construction, military and other fields. It is a kind of thermoplastic engineering plastic with excellent comprehensive performance and various uses.
PVDF is mainly used in the three major fields of petrochemical, electronic and electrical, and fluorocarbon coatings. It can be used as solar backplane films, filter films, wires, cables, pipes, battery adhesives, coatings, etc., and has broad development and application prospects. Because of its good chemical resistance, processability, fatigue resistance and creep resistance, it has the incomparable advantages of other fluororesins in chemical anti-corrosion. One of the best materials for pipeline fittings, storage tanks and heat exchangers, and the equipment made by it can meet TOCS and flame retardant requirements, and can be used for storage and transportation of high-purity chemicals in the semiconductor industry. PVDF is mostly used in the following aspects:
PVDF fluorocarbon coating:
PVDF fluorocarbon coating can form a protective coating with excellent performance after high temperature curing. This coating has the advantages of weather resistance, color retention, impact resistance, corrosion resistance, etc. It can be used outdoors for a long time without maintenance. It is an ideal surface protection It is widely used in the coating of metal materials in harsh environments such as building exterior wall decoration, subways, and chemical production areas.
Lithium battery cathode binder:
PVDF has strong anti-oxidation and reduction ability, good thermal stability, and is easy to disperse in NMP solvent. It is the best choice for lithium battery cathode binder. It can also be used as battery separator material or coating layer to enhance the mechanical properties of the separator. Enhance the liquid retention of the diaphragm to the electrolyte, and improve the high voltage stability of the diaphragm.
Hollow fiber membrane:
PVDF can also be made into a hollow fiber membrane, which has high packing density and high filtration precision, and is widely used in drinking water treatment, printing and dyeing, food, medicine, sewage reuse and seawater desalination advanced pretreatment and other fields.
Photovoltaic backplane film:
PVDF film is safe, reliable, and has good corrosion resistance. It has become the material of choice for photovoltaic backplane film, and its application in this field has been rapidly developed and widely recognized.
