Properties Of PET Material
English name: Polyethylene Terephthalate, referred to as PET, is a high polymer, by the dehydration condensation reaction of terephthalic acid glycol ester. Terephthalic acid glycol ester is obtained by esterification reaction of terephthalic acid and ethylene glycol. Pet is milky or light yellow, highly crystalline polymer, smooth surface gloss.
Excellent physical and mechanical properties within a wide temperature range long-term use of temperature up to 120 Shan, excellent electrical insulation, even at high temperature and high frequency, its electrical performance is still good, but the corona resistance is poor, creep resistance, fatigue resistance, friction resistance, dimensional stability is very good.
1, has good mechanical properties, impact strength is the $number times of other films, good folding resistance.
2, oil-resistant, fat-resistant, dilute acid, dilute alkali, resistance to most solvents.
3, with excellent resistance to high and low temperature performance, can be used in 120 Shan temperature range for a long time, short-term use can withstand 150 Shan high-temperature, can withstand-70 Shan low temperature, and high, low temperature on its mechanical properties of small.
4, gas and water vapor permeability is low, that is, has excellent gas resistance, moisture, oil and odor performance.
5, high transparency, can block ultraviolet rays, good gloss.
6, non-toxic, tasteless, good health and safety, can be directly used in food packaging.
PET is milky or light yellow highly crystalline polymer, smooth surface gloss. Creep resistance, fatigue resistance, friction resistance and dimensional stability, wear small and high hardness, with thermoplastic materials, the largest toughness: Electrical insulation performance, affected by the temperature is small, but the corona resistance is poor. temperature, weather resistance, chemical resistance to good stability, low water absorption, weak acid and organic solvents, but not resistant to hot water immersion, not alkali.
The glass temperature of pet resin is higher, the crystallization speed is slow, the molding period is long, the forming period is long, the forming shrinkage rate is big, the dimensional stability is poor, the crystallization is brittle and the heat resistance is low. Through the improvement of nucleating agent, crystallization agent and glass fiber, pet has the following characteristics in addition to its PBT properties:
1, thermal deformation temperature and long-term use temperature are the highest in thermoplastic general materials.
2, because of high heat resistance, enhanced pet in 250 Shan solder bath impregnation 10s, almost no discoloration, especially suitable for the preparation of tin welding electronic, electrical parts.
3, bending strength 200Mpa, elastic modulus 4000Mpa, creep resistance and fatigue is also very good, high surface hardness, mechanical properties and thermosetting plastic similar.
4, since the production of ethylene glycol for pet is nearly half the price of the butyl alcohol used in production, so pet resin and pet is the lowest price in engineering plastics, with a high cost-effective.