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PVDF 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 1.77-1.80g/cm3 and a relative molecular mass of 40 -800,000, melting point: 172~180°C, thermal decomposition temperature: 350°C.
The processing temperature range from melting point to decomposition temperature is wide, the processing temperature is low, and the repeating units -CH2-CF2-, CH2- and CF2- are arranged alternately, so that it has the characteristics of both fluororesin and general-purpose resin. Excellent chemical corrosion 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 application
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., with 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 produced 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 being cured at high temperature. The 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 preferred material for photovoltaic backplane film, and its application in this field has been developed rapidly and widely recognized.
market analysis
In 2022, due to the continuous growth of demand in industries such as new energy vehicles, photovoltaics, 5G, and lithium batteries, the supply and demand of PVDF and its upstream main raw material R142b will be tight, and the expansion of new production capacity will take a long time, and the technical barriers to products will be high. The short-term supply will not be sufficient. Until effective relief, the price has been rising all the way.
In 2022, due to the continuous growth of demand in industries such as new energy vehicles, photovoltaics, 5G, and lithium batteries, the supply and demand of PVDF and its upstream main raw material R142b will be tight, and the expansion of new production capacity will take a long time, and the technical barriers to products will be high. The short-term supply will not be sufficient. Until effective relief, the price has been rising all the way.
Under the background of the global “double carbon” goal and the promotion of clean and low-carbon development of the energy system, photovoltaic power generation and power vehicles will be in a period of rapid development in the world, and the demand for PVDF in lithium batteries will continue to grow rapidly.
