2023-05-22
Generally, plastics are divided into three types: general plastics, engineering plastics and special plastics. There are five types of general plastics, namely polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS) and acrylonitrile-butadiene styrene copolypolymer (ABS).
Introduction to fluorine plastics
2023-05-22
Fluoroplastics are alkane polymers in which some or all of the hydrogen is replaced by fluorine, they have Polytetrafluoroethylene (PTFE) Perfluoride (ethylene propylene copolymer) (FEP), Polyperfluoroalkyl resin (PFA), Polytrifluorochloroethylene (PCTFE), Ethylene-trifluorochloroethylene copolymer (ECTFE), Ethylene tetrafluoroethylene copolymer (ETFE), Polyvinylidene fluoride (PVDF) Polyvinyl fluoride (PVF).
Fluorine plastics processing method
2023-05-22
Die molding Fluorine plastic molding can be processed plate, rod, sleeve, tape, sealing ring, diaphragm and metal insert parts. The molding is divided into three steps: preforming, sintering and cooling. There are two methods of cold pressing and hot pressing. Preforming is the fluorine plastic powder (currently PTFE) evenly added to the mold, at room temperature pressure into dense preforming products (that is, rough); Sintering is the process of heating the preformed product above the melting point, and cooling is the process of lowering the sintering temperature to room temperature.
Fluorine plastics processing method
2023-05-22
Isostatic molding Injection molding plunger extrusion molding paste extrusion molding
2023-05-22
Trade names "Teflon", "Teflon", "Teflon", "Teflon", "F4", etc Melting point: 327℃ Density: 2.17g /cm3 Advantages: High temperature resistance - working temperature up to 250℃. Low temperature resistance -- good mechanical toughness; Even if the temperature drops to -196℃, 5% elongation can be maintained. Corrosion resistance - For most chemicals and solvents, showing inertia, strong acid and alkali resistance, water and various organic solvents. Weather resistant - has the best aging life of plastics. High lubrication - is the lowest friction coefficient of solid materials (0.01~0.10). Non-adhesion - is the smallest surface tension in solid materials, does not adhere to any substance. Non-toxic -- with physiological inertia, as artificial blood vessels and organs implanted in the body for a long time without adverse reaction. Electrical insulation - can resist 1500 volts of high voltage. Disadvantages: Cold flow, non-stick, high coefficient of linear expansion (20 times of steel)
Molecular structure and properties of PTFE
2023-05-22
Poor creep resistance, easy to cold flow mechanical strength is not high, wear resistance, scratch resistance is poor
2023-05-22
Plastic modification Plastic modification is a relatively universal concept, whether through physical, chemical, mechanical and other ways to improve the original properties of resin or improve are called plastic modification
Effect of filling modification on properties of PTFE
2023-05-22
Effect of filling modification on properties of PTFE
Effect of various fillers on the properties of PTFE
2023-05-22
Effect of various fillers on the properties of PTFE
Effect of various fillers on the properties of PTFE
2023-05-22
Effect of various fillers on the properties of PTFE
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