PETG (Polyethylene Terephthalate Glycol) modified copolyester

Abstract

The invention discloses a PETG (Polyethylene Terephthalate Glycol) modified copolyester. The PETG modified copolyester comprises the following components in parts by weight: 65-85 parts of terephthalic acid, 15-20 parts of ethylene glycol, 18-25 parts of neopentyl glycol, 10-15 parts of aminopropyl methyl diethoxysilane, 5-7 parts of trialkylphosphate, 20-25 parts of trimellitic anhydride, 12-18 parts of 1,1-cyclopropyl dicarboxylic acid, 8-13 parts of decabromodiphenyl ethane, 10-15 parts of 2-acetoxyl-4-methoxybenzophenone, 5-12 parts of 3,5-dichlorobenzene sulfonamide, 6-10 parts of manganese dioxide, 1-2 parts of a stabilizer, 2-3 parts of an antioxidant and 2-3 parts of a compatilizer. The preparation method comprises the following steps: mixing, performing microwave heating, and carrying out an esterification reaction in mixed gas so as to obtain an oligomer; charging the oligomer to carry out a condensation polymerization reaction so as to obtain a copolymer; and finally, charging the copolymer and regulating the pH value, and stirring, thereby obtaining the final copolyester. The copolyester is modified by utilizing the esterification and condensation polymerization processes, the characteristics of the original PETG copolyester are changed, and the prepared copolyester has high strength, high temperature resistance, lubricating and anti-adhesion properties and wide application range.

Description

technical field [0001] The invention belongs to the technical field of preparation of modified copolyester, in particular to a PETG modified copolyester. Background technique [0002] PETG is an amorphous high-transparency engineering plastic, which is widely used in daily necessities and industrial supplies. Because of its non-toxic, odorless, high transparency, excellent impact resistance, high rigidity, hardness and good toughness, it also has good Alkali resistance. PETG has been certified by the US FDA and can be used in food and personal care product packaging, medical and health equipment, food and other fields, and can also be used in electronic device packaging. A prominent application field of PETG is the preparation of films, especially transparent films and heat-shrinkable films. PETG film has a series of characteristics such as non-toxic, odorless, high strength, high heat shrinkage rate, good transparency and good packaging effect. The biggest advantage of P...

AI Technical Summary

Problems solved by technology

[0003] During the esterification reaction process of PETG bulk copolyester, it is easy to cause the low solubility of each component to cause incomplete dissolution, the esterification reaction is delayed, the stability is low, and the product quality after polycondensation is affected. The softness of PETG body copolyester is strong, resulting in low strength. The heat shrinkable film made has low strength and poor high temperature resistance. The main low melting point polyester and heat shrinkable film are manufactured, and PETG body copolyester cannot Used alone for stretching, blow molding and cast film and sheet production, the scope of application is small, which is not conducive to large-scale promotion

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