High-molecular-weight polyethylene terephthalate-lactic acid copolymer

A technology of polyethylene terephthalate lactic acid and terephthalic acid, which is applied in the field of polymer materials, can solve the problems of no practical application value, little practical significance, and low molecular weight, so as to inhibit thermal decomposition and reduce petroleum Dependence on resources, the effect of broad application prospects

Inactive Publication Date: 2010-12-22
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the softening point of PET is 220°C or above, which is much higher than the decomposition temperature (185°C) of lactide or polylactic acid, so that the molecular weight of the obtained product is low, which has little practical significance.
Polish researcher Ewa Olewnik et al. (Olewnik E, et al. Synthesis and structural study of copolymers of L-lactic acid and bis (2-hydroxyethyl terephthalate. European Polymer Journal, 2007, 43: 1009-1019) will Hydroxyethyl ester (BHET) and oligomeric lactic acid are prepared by polycondensation reaction to prepare copolyester. Since oligomeric lactic acid is easier to decompose during the polymerization process, the molecular weight of the obtained product is not high, and the number average molecular weight is between 2690-3900. Practical application value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 150g of terephthalic acid, 106.4g of ethylene glycol, 90g of L-lactic acid and 0.4g of tetrabutyl titanate into a reactor protected by nitrogen, raise the temperature to 180-230°C, and carry out the esterification reaction under normal pressure 3 to 5 hours. After the esterification reaction, add 0.08g of antimony trioxide, 0.3g of stannous octoate and 0.2g of triphenyl phosphate, and polycondense for 4 hours at 230°C under a pressure of 0.1 to 100mmHg to obtain polyterephthalic acid. Ethylene glycol lactic acid copolymer, the weight average molecular weight measured by GPC is 9400. The polycondensation sample was pulverized into a powder with a particle size of 0.15-0.5 mm, and then solid-phase polymerization was carried out. Before the solid-phase polymerization, the reactor was repeatedly fed with nitrogen and evacuated 3 times, and finally the vacuum degree was controlled below 1 mmHg. Heating by gradually heating up, reacting at 135°C for 3 hours, 150°C for 3...

Embodiment 2

[0044] The above-mentioned Example 1 product was solid-phase polymerized again, and reacted at 175°C for 16 hours and 180°C for 16 hours. The weight-average molecular weight of the finally obtained product was 60628, the intrinsic viscosity was 0.69dl / g, and the glass transition temperature was 73°C. The melting point is 207.5°C. The film made of this copolymer has a tensile strength of 50.2 MPa and an elongation at break of 3%.

Embodiment 3

[0046] Add 150g of terephthalic acid, 106.4g of ethylene glycol, 54g of L-lactic acid and 0.4g of tetrabutyl titanate into a reactor protected by nitrogen, raise the temperature to 180-230°C, and carry out esterification under normal pressure 6 to 8 hours. After the esterification reaction, add 0.08g antimony ethylene glycol, 0.3g stannous octoate and 0.2g triphenyl phosphate, and polycondense for 4 hours at 230°C under a pressure of 0.1-100mmHg to obtain polyterephthalic acid Ethylene glycol lactic acid copolymer, the weight average molecular weight measured by GPC is 11570. The polycondensation sample was pulverized into a powder with a particle size of 0.15-0.5 mm, and then solid-phase polymerization was carried out. Before the solid-phase polymerization, the reactor was repeatedly fed with nitrogen and evacuated 3 times, and finally the vacuum degree was controlled below 1 mmHg. Heating by gradually heating up, reacting at 135°C for 3 hours, 150°C for 3 hours, and 175°C ...

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Abstract

The invention discloses a high-molecular-weight polyethylene terephthalate-lactic acid copolymer, which is formed mainly by copolymerization of terephthalic acid or dimethyl terephthalate and ethylene glycol and lactic acid, wherein the molar ratio of the terephthalic acid or dimethyl terephthalate to the ethylene glycol is 1:0.5-3; the molar ratio of the terephthalic acid or dimethyl terephthalate to the lactic acid is 1:0.1-2; the weight-average molecular weight of the copolymer is 10,000 to 300,000; the intrinsic viscosity of the copolymer 0.3-2.0dl/g; the glass-transition temperature of the copolymer is 50 to 90 DEG C; and the melting point of the copolymer is 110 to 255 DEG C. The copolymer has a high molecular weight and biodegradability, can be used as an environmentally-friendly novel material or a compatibilizer directly and has a promising application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high molecular weight polyethylene terephthalate lactic acid copolymer and its preparation method and application. Background technique [0002] In order to simplify the manufacturing process, reduce product costs and extend the life of objects, scientists created synthetic polymers instead of natural ones. These durable polymers enhance quality of life by creating affordable products for the average consumer. However, due to the low price and convenience of these polymer products, most of the polymer products are not reused, resulting in a large amount of polymer waste, and such polymer materials have stable chemical properties. It is difficult to decompose in the natural environment, causing serious environmental pollution. [0003] Polyethylene terephthalate (hereinafter referred to as PET) has excellent mechanical properties and low gas permeability....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/80
Inventor 邵芳可刘刚桥陆榕吴刚
Owner TORAY FIBER RES INST(CHINA) CO LTD
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