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

Active Publication Date: 2013-05-15
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high energy consumption of PET melt blending and compounding, it is easy to degrade the material, the dispersion of inorganic fillers in the PET matrix is ​​poor, and the size of the dispersed phase is larger than the wavelength of visible light, resulting in poor transparency of PET materials.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 3.74kg of terephthalic acid, 0.42kg of isophthalic acid, and 2.02kg of ethylene glycol into the esterification kettle, and carry out the esterification reaction at 0.2~0.4MPa and 260°C. When the distilled water generated by the esterification reaches After the target value, transfer it to the polycondensation tank, add catalyst, stabilizer, antioxidant and 332g polyethylene glycol 400 and 20.6g 1,2,3-propanetriol, normal compression polymerization for 45 minutes, in 45 minutes Gradually reduce the pressure in the reactor to 60Pa, and at the same time raise the temperature to 270°C, conduct high-vacuum polycondensation for 2 hours, when the intrinsic viscosity reaches the target value, fill with nitrogen, press the material into water under nitrogen pressure, and cool it with water , strands, and pelletized to obtain polycondensate slices; after drying the polycondensate slices, solid-state polycondensation under 20Pa and 190°C for 20 hours, when the intrinsic viscosi...

Embodiment 2

[0032] Put 2.91kg of terephthalic acid, 1.25kg of isophthalic acid, and 2.02kg of ethylene glycol into the esterification kettle, at 0.2~0.4MPa,

[0033] Carry out the esterification reaction at 260°C. When the distilled amount of water generated by the esterification reaches the target value, it is transferred to the polycondensation kettle, and a catalyst, a stabilizer, an antioxidant, 166g of polyethylene glycol 100 and 4.12g of three Methylol propane, polycondensation under normal pressure for 45 minutes, gradually reduce the pressure in the reactor to 60Pa within 45 minutes, and at the same time raise the temperature to 270°C, polycondensate under high vacuum for 2 hours, when the intrinsic viscosity reaches the target value, fill in Nitrogen, press the material into water under nitrogen pressure, and obtain polycondensate slices after water cooling, drawing, and pelletizing; after drying the polycondensate slices, carry out solid-state polycondensation under 20Pa and 160°...

Embodiment 3

[0035] 82.45g dimethyl terephthalate, 14.55g dimethyl isophthalate, 50g ethylene glycol, 9.3g neopentyl glycol,

[0036] Add catalyst, stabilizer, and antioxidant to a 500mL flask, esterify under a slight nitrogen flow at 190°C until methanol distillates to more than 95%, add 5mg of pentaerythritol, heat up to 250°C, vacuumize, and reduce the pressure within 45 minutes Gradually reduce to 60Pa, polycondensate under high vacuum for 3 hours to obtain polyester product; crush 20g of the product, put it into a 100mL round bottom flask after drying, and conduct solid phase polycondensation under high vacuum under 20Pa at 185°C for 15 hours, then cool to 60 The material is discharged below ℃, and the performance test results are shown in Table 1.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/181C08G63/78C08L67/02
Inventor 赵巍徐依斌苑仁旭焦建钟宇科曾祥斌蔡彤旻宁凯军
Owner KINGFA SCI & TECH CO LTD
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