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Polylactic acid/polyethylene terephthalate multi-block copolymer, method for preparing same and uses

A technology of polyethylene terephthalate and polyethylene terephthalate, which is applied in the field of polylactic acid/low melting point polyethylene terephthalate multi-block copolymer and its preparation, can solve the problem of Poor reaction reproducibility and controllability, reduced diisocyanate coupling efficiency, difficult control of modified PET structure, etc., to achieve good thermal stability and mechanical processing performance, wide performance range, and increased molecular weight

Active Publication Date: 2011-04-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the direct polymerization method is adopted, due to the different reactivity of terephthalic acid and diols in the esterification reaction, there is too much terephthalic acid that does not participate in the reaction, causing the structure of the modified PET to be difficult to control, and the reproducibility and reliability of the reaction. poor control
In addition, since the obtained PET has a carboxyl group at the chain end, if it is coupled with a diisocyanate, the coupling efficiency of the diisocyanate will inevitably be reduced, which is also very unfavorable for increasing the molecular weight of the copolymer.

Method used

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  • Polylactic acid/polyethylene terephthalate multi-block copolymer, method for preparing same and uses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix dimethyl terephthalate and 1,8-octanediol in a molar ratio of 1:3, and 0.2% catalyst zinc acetate in terms of mass percentage of dimethyl terephthalate, at 170°C The transesterification reaction was carried out for 3.5 hours; the obtained octylene terephthalate and ethylene terephthalate were mixed in a molar ratio of 1:1, and then 0.05 % antimony trioxide catalyst, polycondensation reaction at a temperature of 260° C. and a pressure of 250 Pa for 2.4 hours. The resulting product had an intrinsic viscosity of 0.12 dl / g and a melting point of 110°C.

[0034] Mix the obtained low-melting-point PET with the hydroxyl-terminated lactic acid prepolymer with an intrinsic viscosity of 0.06dl / g in a molar ratio of 1:1, heat to melt, and add the low-melting-point PET and lactic acid prepolymerized Add 0.5% coupling agent toluene diisocyanate to the total weight of the product, then react at 140°C for 5 minutes and discharge. The resulting product had an intrinsic viscosity ...

Embodiment 2

[0036] Dimethyl terephthalate and 2,2-dimethyl-1,3-propanediol in a molar ratio of 1:2.5, and 0.08% catalyst acetic acid in terms of mass percent of dimethyl terephthalate Zinc was mixed, transesterified at 175°C for 3 hours, and the resulting 2,2-dimethyl-1,3-propanediol terephthalate was mixed with ethylene terephthalate in a molar ratio of 1:1.22, Then add 0.04% antimony trioxide catalyst based on the total weight of dimethyl terephthalate used in the reaction, and perform polycondensation reaction at a temperature of 265° C. and a pressure of 190 Pa for 3 hours. The resulting product had an intrinsic viscosity of 0.21 dl / g and a melting point of 116°C.

[0037] Mix the obtained low-melting-point PET with the hydroxyl-terminated lactic acid prepolymer with an intrinsic viscosity of 0.09dl / g in a molar ratio of 1:1, heat up to melt, and add the low-melting-point PET and lactic acid prepolymerized under the protection of nitrogen. 1.8% of the total weight of the coupling age...

Embodiment 3

[0039] Mix dimethyl terephthalate and 1,6-hexanediol in a molar ratio of 1:5, and 0.5% catalyst zinc acetate in terms of mass percentage of dimethyl terephthalate, and mix them at 180° C. Under the transesterification reaction for 4.5h, the resulting hexanediol terephthalate and ethylene terephthalate were mixed in a molar ratio of 1:1, and then 0.1 % antimony trioxide catalyst, polycondensation reaction at a temperature of 270° C. and a pressure of 70 Pa for 4.5 hours. The resulting product had an intrinsic viscosity of 0.46 dl / g and a melting point of 121°C.

[0040] After mixing the obtained low-melting-point PET and the hydroxyl-terminated lactic acid prepolymer with an intrinsic viscosity of 0.13dl / g in a molar ratio of 1:9, heat up to melt, and add the low-melting-point PET and lactic acid prepolymerization amount under the protection of nitrogen. 9.7% of the total weight of the coupling agent toluene diisocyanate, and then reacted at 128 ° C for 90 minutes to discharge...

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Abstract

The invention discloses pla / polyethylene terephthalate segmented copolymer, which is characterized in that the copolymer is prepared by the melting reaction of low melting point polyethylene terephthalate with the melting point of 110 to 210 DEG C and the intrinsic viscosity of 0.3 to 1.5dl / g and hydroxyl at two ends and pla-prepolymer with hydroxyl at two ends and the intrinsic viscosity of 0.05to 0.5dL / g under the presence of the coupling agent of diisocyanate. The intrinsic viscosity of the copolymer is 0.3 to 2.5 dL / g, the melting point is 110 to 210 DEG C. The invention also discloses apreparation method for the copolymer. The segmented copolymer which is provided by the invention not only has high molecular weight and good thermal stability as well as machinability, but also has excellent biodegradability of PLA and establishes the basis for the materials as the general type polymer materials. The segmented copolymer has simple method and process, low cost by adopting the direct melting method to prepare lactic acid and easy controlled reaction, and thereby can realize the scale and continuous industrial production.

Description

technical field [0001] The invention belongs to the technical field of copolymerization modification of polyethylene terephthalate and polylactic acid, and specifically relates to polylactic acid / low melting point polyethylene terephthalate multi-block copolymer and its preparation method and application. Background technique [0002] Polyethylene terephthalate (PET) has excellent heat resistance, chemical resistance, toughness, electrical insulation, safety and other advantages, and has been widely used in fibers, films, engineering plastics, polyester Bottles, etc., but because it is a traditional petroleum-based material, it is not only difficult to degrade after being discarded, it will cause serious environmental pollution, and its cost is also rising due to the sharp rise in petroleum prices. In this regard, a large number of modification studies have been carried out to improve its degradation performance and reduce its cost. [0003] Polylactic acid (PLA) is a fully...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/685C08G63/78D01F6/84C09J167/00
Inventor 汪秀丽李闻达王玉忠
Owner SICHUAN UNIV
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