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Fluorine plastic
by：CSSSLD
2021-01-23
Of organic compounds, in addition to halide amine and aromatic hydrocarbons on the slight swelling, all the other organic solvents have no effect on PTFE, only three fluoride molten alkali and high temperature chlorine etc have erosion on it.
Its chemical stability than glass, pottery and porcelain, stainless steel, even better than gold, platinum also stable.
Injection molding processing PTFE has good thermal stability, and is not affected by oxygen, ozone, ultraviolet rays, not easy ageing, not easy be affected with damp be affected with damp, also mold, etc.
the molecular structure of PTFE and PE are similar, symmetry and neat degree good, almost no branched, with linear structure, thus easy to crystallization. General product crystallinity of 57% 75%, up to 93% 97%. And crystallinity depends on the relative molecular mass and forming in the cooling rate and cooling rate is accelerated, with the increase of the relative molecular mass plastic products decreasing crystallinity, density decreases.
PTFE has excellent electric properties, the relative dielectric constant is less than 2. 1, is not affected by temperature, humidity and frequency, can be used in damp environment. His good arc resistance, up to 360 s, but the corona resistance is not good, not for high voltage insulation. PTFE has excellent chemical stability, even at high temperature and strong acid, strong alkali, strong oxidizing agents, and even in aqua regia boil, quality and performance are no change, this is called the king of plastic one of the important reasons.
PTFE only exist in macromolecular chain of C - F keys and C - C key, with high stability. From space, the carbon chain around just surrounded by a layer of fluorine, fluorine atoms volume is big, can shield the main chain of carbon atoms, this structure makes it has high temperature resistance, corrosion resistance, and excellent weatherability. Although the fluorine atom electronegativity is very strong, but due to the symmetry of macromolecular dipole moment is close to zero, molecular polarity, and between macromolecules and other attraction between molecules is very small, surface is extremely inert. On the one hand, make its excellent electrical insulation, on the other hand also makes the PTFE macromolecular surface free energy is low, in the solid material is known among the smallest of the surface free energy materials, therefore, is highly not adhesion and the lowest coefficient of friction.
PTFE is white, odorless, tasteless, non-toxic, waxy white powder, no combustion, difficult to glue, not bibulous, surface feel satiny, is one of the largest varieties of existing plastic material density. The tensile strength of the PTFE is low, general 15 to 30 mpa, PE and its elastic modulus is 400 mpa, slightly lower than that of HDPE. And lower bending, hardness and compression strength, resilience is poor. It also poor, the creep resistance of products under long-term load deformation will happen, with the increase of load, time and temperature was exacerbated.
emulsion polymerization in adding initiator, emulsifier, reaction kettle with paraffin or fluorocarbon compounds as stabilizer, TFE aggregation in DNA distilled water, control the reaction temperature is 80 - About 2, 90 ℃, pressure. 7PMa。 After the polymerization, the concentrated emulsion and emulsion can be get after classics agitate, cohesion, water washing, drying the suspension polymerization finer granularity than powdered resin. Powder is mainly used for resin paste extrusion molding and manufacture pipe fittings, bars; Concentration of emulsion used for spraying, stretch film, impregnation, wet mixed packing products.
PTFE outstanding mechanical properties is small, friction coefficient of steel dynamic and static friction coefficients of 0. 04, are the smallest among the existing plastic material, is a kind of good wear resistance, antifriction and self-lubricating material. But its abrasion is bigger, can add molybdenum disulfide, silica, etc. Injection molding processing PTFE has excellent resistance to high and low temperature performance, working temperature range in - for a long time 195 - Between 260 ℃ and short-term even up to 300 ℃. Thermal conductivity of PTFE centered within the plastic such as level, but the linear expansion coefficient has a larger value in the plastic, more than 10 - steel 20 times.
more excellent articles: polyethylene terephthalate succinic ester, click directly.
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changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
the molecular structure of PTFE and PE are similar, symmetry and neat degree good, almost no branched, with linear structure, thus easy to crystallization. General product crystallinity of 57% 75%, up to 93% 97%. And crystallinity depends on the relative molecular mass and forming in the cooling rate and cooling rate is accelerated, with the increase of the relative molecular mass plastic products decreasing crystallinity, density decreases.
PTFE has excellent electric properties, the relative dielectric constant is less than 2. 1, is not affected by temperature, humidity and frequency, can be used in damp environment. His good arc resistance, up to 360 s, but the corona resistance is not good, not for high voltage insulation. PTFE has excellent chemical stability, even at high temperature and strong acid, strong alkali, strong oxidizing agents, and even in aqua regia boil, quality and performance are no change, this is called the king of plastic one of the important reasons.
PTFE only exist in macromolecular chain of C - F keys and C - C key, with high stability. From space, the carbon chain around just surrounded by a layer of fluorine, fluorine atoms volume is big, can shield the main chain of carbon atoms, this structure makes it has high temperature resistance, corrosion resistance, and excellent weatherability. Although the fluorine atom electronegativity is very strong, but due to the symmetry of macromolecular dipole moment is close to zero, molecular polarity, and between macromolecules and other attraction between molecules is very small, surface is extremely inert. On the one hand, make its excellent electrical insulation, on the other hand also makes the PTFE macromolecular surface free energy is low, in the solid material is known among the smallest of the surface free energy materials, therefore, is highly not adhesion and the lowest coefficient of friction.
PTFE is white, odorless, tasteless, non-toxic, waxy white powder, no combustion, difficult to glue, not bibulous, surface feel satiny, is one of the largest varieties of existing plastic material density. The tensile strength of the PTFE is low, general 15 to 30 mpa, PE and its elastic modulus is 400 mpa, slightly lower than that of HDPE. And lower bending, hardness and compression strength, resilience is poor. It also poor, the creep resistance of products under long-term load deformation will happen, with the increase of load, time and temperature was exacerbated.
emulsion polymerization in adding initiator, emulsifier, reaction kettle with paraffin or fluorocarbon compounds as stabilizer, TFE aggregation in DNA distilled water, control the reaction temperature is 80 - About 2, 90 ℃, pressure. 7PMa。 After the polymerization, the concentrated emulsion and emulsion can be get after classics agitate, cohesion, water washing, drying the suspension polymerization finer granularity than powdered resin. Powder is mainly used for resin paste extrusion molding and manufacture pipe fittings, bars; Concentration of emulsion used for spraying, stretch film, impregnation, wet mixed packing products.
PTFE outstanding mechanical properties is small, friction coefficient of steel dynamic and static friction coefficients of 0. 04, are the smallest among the existing plastic material, is a kind of good wear resistance, antifriction and self-lubricating material. But its abrasion is bigger, can add molybdenum disulfide, silica, etc. Injection molding processing PTFE has excellent resistance to high and low temperature performance, working temperature range in - for a long time 195 - Between 260 ℃ and short-term even up to 300 ℃. Thermal conductivity of PTFE centered within the plastic such as level, but the linear expansion coefficient has a larger value in the plastic, more than 10 - steel 20 times.
more excellent articles: polyethylene terephthalate succinic ester, click directly.
http://www。 csssld。 cn//html/2017/Info_1022/705。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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