Low-melting point and transparent PET copolyester, its preparation method and application

A copolyester, low melting point technology, applied in the field of modified PET copolyester, can solve the problems of poor transparency, poor dispersibility and high energy consumption of PET materials, shorten polymerization time, improve processing performance, and reduce energy consumption Effect
CN103102473AActive Publication Date: 2013-05-15KINGFA SCI & TECH CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KINGFA SCI & TECH CO LTD
Publication Date
2013-05-15

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Abstract

The invention discloses a low-melting point and transparent PET (polyethylene terephthalate) copolyester, its preparation method and application. The PET copolyester comprises, by mass: 60-84% of PET, 10%-30% of a unit derived from isophthalic acid, 5%-29% of a crystallization adjusting agent, and 0.03-2% of a branching agent. According to the preparation method, in a synthesis process of PET, based on p-phthalic acid (PTA) and ethylene glycol (EG), the unit derived from isophthalic acid, the crystallization adjusting agent and the branching agent are added to undergo a chemical reaction together, thus obtaining the low-melting point and transparent PET copolyester. The PET copolyester provided by the invention has an intrinsic viscosity greater than 0.9dL / g and a melting point lower than 230DEG C, can be solidified into an amorphous state from a molten state during injection molding, and has good transparency as well as further improved processing performance.
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Description

technical field

[0001] The invention relates to a modified PET copolyester, in particular to a low-melting, transparent PET copolyester and its preparation method and application. Background technique

[0002] Poly(dimethyl terephthalate) (PET) is a polymer with excellent properties. It is widely used in polyester bottles, fibers, films and Engineering plastics and other fields.

[0003] In some application fields of polyester, it is required to ensure the transparency of the material. Ordinary polyester materials will become white due to the crystallization of polyester after being exposed to heat or organic solvents. At present, in order to obtain a transparent modified PET resin, the modification of PET materials is mainly through modification to inhibit the crystallization of PET, such as adding inorganic fillers, blending with other resins, and combining with dibasic acids other than terephthalic acid. And / or co-condensation of glycols other than ethylene glycol. [...

Claims

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