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Poly(ethylene terephthalate) (Poly(ethylene terephthalate))

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Poly(ethylene terephthalate)

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poly(ethylene terephthalate)
PET
PETE

+Expand -Stow

25038-59-9

C10H8O5

208.168

2933990090

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Nature Description

Density 1.68g/mL at 25°C
Melting point 250-255°C
Molecular formula C10H8O5
Molecular weight 208.16800
Accurate quality 208.03700
PSA 61.83000
LogP 0.94540

Product Applications

In the plastic classification, the code of PET is No. 1, which has a wide range of functions: the main applications are: electrical sockets, electronic connectors, rice cooker handles, TV yoke, terminal block, breaker shell, switch, motor fan case, instrument mechanical parts, currency counting machine parts, electric iron, induction cooker oven accessories; Flow control valve, carburetor cover, car window controller, pedal transmission, distribution panel cover in automobile industry; Mechanical industrial gear, blades, pulley, pump parts, wheelchair body and wheels, lampshade shell, illuminator shell, drainage pipe joint, zipper, clock parts, sprayer parts. In addition: it can be spun into polyester fiber, namely polyester. Can be made into film for recording, video recording, film film and other substrate, insulation film, product packaging and so on. As plastic can be blown into each

Production method

Polyester polyester is formed by polycondensation of terephthalic acid and ethylene glycol, which follows the general law of linear polycondensation. The production of polyester polyester has successively developed two synthetic technologies: transesterification and direct transesterification. (1) transesterification or indirect transesterification is a traditional production method, which consists of three steps of methyl ester, transesterification and final polycondensation. The purpose of methyl ester is to facilitate the purification and purification of dimethyl terephthalate. ① methylated terephthalic acid and a little excess of methanol reflect, first transesterification into dimethyl terephthalate. Steam out water, excess methanol, methyl benzoate and other low boiling substances, and then rectify to obtain pure dimethyl terephthalate. ② transesterification at 190 ~ 200℃, Cadmium acetate and antimony trioxide are used as catalysts to transesterify dimethyl terephthalate and ethylene glycol (molar ratio about 1:2.4) to form polyester oligomer. Distilling methanol to make transesterification sufficient. ③ final polycondensation at above polyester melting point, such as 283 ℃, using antimony trioxide as catalyst to make ethylene Terephthalate self-polycondensation or transesterification, by reducing pressure and high temperature, the byproduct ethylene glycol is continuously distilled off, gradually increase the degree of polymerization. In the methyl ester and transesterification stages, the equal group number ratio is not considered. In the final polycondensation stage, according to the distilling amount of ethylene glycol, the ratio of the number of two buddies clusters is naturally adjusted, gradually approaching isoequivalent weight, slightly exceeding ethylene glycol, blocking both ends of molecules and reaching the predetermined degree of polymerization. (2) after the purification technology of terephthalic acid by direct Ester method is solved, this is the preferred economic method. Terephthalic acid and excess ethylene glycol are first reacted to low polymerization degree (for example, X = 1~4) at 200℃, then, the final polyester product with high polymerization degree (n = 100~200) is finally polycondensed at 280℃, which is the same as the indirect Ester method. With the increase of polycondensation reaction degree, the viscosity of the system increases. In engineering, it is more advantageous to divide polycondensation into two reactors. Pre-polycondensation in the front section: 270℃,2000~3300PA. Final polycondensation of the latter section: 280 ~ 285℃,60 ~ 130Pa.