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 Currently, PET production in the country's development is very fast, with an annual output capacity has reached number one billion, has become carbonated drinks, mineral water, edible oil and other primary containers. 2, the characteristics of raw materials and PET bottles PET 2.1 PET structure
PET belongs to the organic polymer compound is composed of carbon, hydrogen, oxygen three elements. Molecular structure such as
By:! H- [OCH2CH2-OOC - CO -OHPET generally consists of terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) direct esterification or transesterification reaction generating PET monomer, and then after the formation of the solid phase polycondensation of polyethylene terephthalate. Chemical reaction equation is as follows: HOOC - COOH + 2HOCH2CH2OH "catalyst base HO-CH2CH2-OOC - COO-CH2CH2OH + 2H2O 2.2 PET physical properties
PET way into the polymerization homopolymer and copolymer PET, use is divided into textile PET, bottle grade PET and sheet grade PET. The physical properties are shown in Table 1 bottle grade PET. Table 1 bottle grade PET physical performance characteristics of the No. Item Value Unit 1 Density 1.4 kg / cm3
2 average molecular weight of 25000 ~ 30000 3 IV value of 0.70 to 0.85
4 melting point of 250 ~ 260 ℃ 5 AA content ≤3 mg / Kg 6 Moisture ≤0.4%
7 particle shape cylindrical or parallelepiped
PET hygroscopic, require specific warehousing, before the drying process to be effective. Residues in the production of raw materials and injection molding process difficult to deal with the release of acetaldehyde make PET bottles. 2.3 Performance biaxially stretched PET bottle
(1) has a good light transmittance and gloss, light transmittance is greater than 85%; (2) has good mechanical properties and impact resistance; (3) good chemical resistance;
(4) at room temperature (20 ~ 30 ℃) has good dimensional stability; (5) light weight;
(6) of the gas have good barrier properties. Chemical properties of 2.4 PET

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