PVDF polyvinylidene difluoride, the appearance is translucent or white powder or particle, the molecular chain is closely arranged, and there are strong hydrogen bonds, the oxygen index is 46%, non-combustible, and the crystallinity is 65% to 78%. The density is 1.17~1.79g/cm3, the melting point is 172℃, the thermal deformation temperature is 112~145℃, and the long-term use temperature is -40 ~150℃.

Polyvinylidene fluoride. Polyvinylidene fluoride; PVDF

PVDF is a semi-crystalline polymer with a crystallinity of about 50% under normal conditions. So far, there are five crystal forms, such as α, β, γ, δ and ε, which are formed under different conditions and can be converted into each other under certain conditions (heat, electric field, mechanical and radiation energy). Among these five crystal forms, β crystal form is the most important, and PVDF, which is used as a piezoelectric and pyroelectric application, mainly contains β crystal form.

performance

White powdery crystalline polymer. Density of 1.75 1.78 g/cm3. The glass transition temperature is -39℃, the embrittance temperature is -62℃, the melting point is 170℃, the thermal decomposition temperature is about 350℃, and the long-term use temperature is -40 ~ 150℃. It can be formed by general thermoplastic processing methods. Its outstanding characteristics are high mechanical strength and good radiation resistance. It has good chemical stability, is not corroded by acid, alkali, strong oxidant and halogen at room temperature, fuming sulfuric acid, strong alkali, ketone, ether cotton a few chemicals can make it swelling or partial dissolution, dimethyl acetamide and dimethyl sulfoxide and other strong polar organic solvents can make it dissolve into colloidal solution. The most common processes are emulsion polymerization and suspension polymerization.

The tensile strength

PVDF resin mainly refers to the homopylidene fluoride or the copolymer of vinylidene fluoride and a small amount of other fluorinated vinyl monomers. PVDF resin has the characteristics of fluorine resin and general resin, in addition to good chemical resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance. It also has special properties such as piezoelectric, dielectric and thermoelectric properties. It is the second largest product in fluorine plastics with an annual production capacity of more than 43,000 tons worldwide. PVDF applications are mainly concentrated in the three major fields of petrochemical, electronic and electrical, and fluorocarbonic coatings. Due to its good chemical resistance, workability, fatigue and creep resistance, PVDF is one of the best materials for pumps, valves, pipes, pipe fittings, storage tanks and heat exchang of petrochemical equipment fluid handling system as a whole or lining.

Its good chemical stability and electrical insulation performance make the equipment can meet the requirements of TOCS and flame retardant, and it is widely used in the storage and transportation of high-purity chemicals in the semiconductor industry. In recent years, porous membranes, gels and diaphragms made of PVDF resin are used in lithium secondary batteries. At present, this application becomes one of the fastest growing markets for PVDF demand. PVDF is one of the most important raw materials of fluorocarbon coatings. Fluorocarbon coatings prepared from PVDF as raw materials have been developed to the sixth generation. Because PVDF resin has super weather resistance, it can be used outdoors for a long time without maintenance, and this kind of coating is widely used in power stations, airports, highways, high-rise buildings, etc. At present in our country to vinylidene fluoride as fluorine monomer and other fluorine monomer copolymerization of coating with room temperature curing fluorocarbon resin has not yet appeared, in this respect has a huge development space. In addition, PVDF resin can also be modified by blending with other resins, such as PVDF and ABS resin to obtain composite materials, which have been widely used in architecture, automobile decoration, home appliance shell, etc.

Performance parameter table

Property test standard data Property test standard data

Density ISO1183 1.77g/cm3 Volume resistance VD0303 >1013xcm

Water absorption DIN53495 0.04% surface resistance VDE0303 >1014

Chemical resistance - dielectric constant 1MHz DIN53483 7.25

Continuous use temperature -30~150℃ dielectric loss factor 1MHz DIN53483 0.18

Yield tensile strength ISO527 50MPa Dielectric strength VDE0303 22kV /mm

Yield tensile strain ISO527 9% leakage current intensity DIN5340 KC300

Ultimate tensile strength ISO527 46MPa Adhesiveness 0

Limit tensile strain ISO527 80% non-toxic harmless EEC90/128 -

Impact toughness ISO179 252kJ/m2 friction coefficient DIN53375 0.34

Notch impact toughness ISO179 22kJ/m2 Combustion performance UL94 V-0

Rockwell ball pressure hardness ISO2039-1 80MPa UV resistance U.V +

Shore D hardness DIN53505 78 acid resistance +

Flexural strength ISO178 80MPa alkali + resistance

Elastic modulus ISO527 2000Mpa Carbonated water +

Veka softening temperature ISO306 140℃ chlorine resistant carbonic acid water (CKW) +

Thermal distortion temperature ISO75 145℃ resistance to aromatic compounds +

Hot wire expansion coefficient DIN53752 1.2K-1*104 ketone resistance 0

Thermal conductivity 20℃ DIN52612 0.13W /(MXK) heat resistant water +

The above data are for reference only and cannot be used as a guarantee of material selection.

Flammability, good electrical insulation performance.

PVDF (bar/plate) specification: plank: 8 ~ 100 mmx1000 mmx620/1000/2000 mm;

PVDF (rod/plate) bar: diameter x length =10 ~ 250mm*1000mm

PVDF (bar/plate) Color: White

PVDF (rod/plate) Origin: Switzerland, Germany

Guangzhou Yayan Plastic Products Co., LTD. Spot supply: PEEK board/rod, PPS board/rod, PVDF board/rod, PTFE board/rod, PSU board/rod, PEI board/rod, PI board/rod, PAI board/rod, PPO board / bar, PBT board/bar, CPVC board/bar, UPE board/bar, PETP board/bar, PC board/bar, POM board/bar, ABS board/bar, PMMA board/bar, PP board/bar, PE board / bar, imported PU board/bar, German PES board/bar, domestic PVC board/bar, Swiss engineering PBI board/bar, German PA nylon series board/bar/piece, MC nylon series board. Insulation materials: Taiwan red, black electric board, cold stamping board, phenolic laminated cloth bar board, heat insulation board, epoxy glass fiber bar board, epoxy board (FR-4) asbestos board, etc. Anti-static products: anti-static POM board/bar, anti-static organic board, anti-static PC board. Anti static PVC board/bar, anti static nylon board/bar synthetic SLATE and so on.

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