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PET is punctuated with Polyethylene terephthalate is the major varieties of thermoplastic polyester, English called Polyethylene terephthalate PET or PEIT ( The following or PET) , commonly known as the polyester resin. It is a condensation polymer of terephthalic acid with ethylene glycol, together with PBT, collectively known as thermoplastic polyester, polyester or fullness.
PET sheet has the following advantages:
1. Outstanding mechanical function, the impact strength is 3 ~ 5 times of other films, the folding resistance.
2。 Resistance to oil, fat, resistance to acid, dilute alkali, resistance to most solvents.
3。 Pure PET heat function is not high, the thermal deformation temperature is 85 ℃ or so, only but enhanced greatly improved after treatment. After glass fiber enhanced the PET mechanics function is similar to the PC, PA, such as engineering plastics, thermal deformation temperature can reach 225 ℃; PET heat aging, brittle temperature was minus 70 ℃, in - At 30 ℃ still have must have patience; PET is not easy to burn, yellow flame, burning oil dripping.
4。 Gas and water vapor penetration rate is low, have a good resistance of gas, water, oil and peculiar smell.
5。 High transparency, to deter a uv, good gloss.
6。 Non-toxic, tasteless, good health security, can be directly used in food packaging.
PET is height of milky white or light yellow crystalline polymer, surface smooth and shiny. Resistance to creep, fatigue resistance, resistance to friction and dimension stability is good, wear small, high hardness, has the patience of thermoplastics: good electrical insulating function, affected by temperature is small, but the corona resistance is poor. Non-toxic, good weather resistance, chemical resistance stability, bibulous rate is low, resistance to dilute acid and organic solvents, but not hot water immersion, not alkali resistance.
PET resin of high glass transition temperature, crystallization speed is slow, the molding cycle is long, the molding cycle is long, forming shortening rate, dimension stability, crystallization of forming a brittleness, low heat resistance level.
by crystallization nucleating agent and the agent and the improvement of glass fiber reinforced PET besides has the properties of PBT, still have the following characteristics.
1。 Thermal deformation temperature and the long-term use of temperature is gm's thermoplastic engineering plastic high
2. Owing to the high heat resistance, enhance the PET in 250 ℃ soldering tin bath soak 10 s, little deformation does not change color, especially suitable preparation soldering of electronic, electrical parts:
3. Bending strength 200 mpa, the elastic modulus of 4000 mpa, the creep and fatigue resistance is also very good, high surface hardness, mechanical function and thermosetting plastic nearby.
4。 Due to produce PET produce ethylene glycol used than PBT butanediol used almost half cheap price, so enhance the PET and PET resin is low price of engineering plastics, has the very high cost performance.
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