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Preparation method of polyethylene terephthalate copolyester

A technology of polyethylene terephthalate copolyester and terephthalate, applied in the direction of one-component copolyester rayon, etc., can solve the problem of biodegradable, Difficult to direct copolymerization and other problems, to achieve the effect of improving biodegradability, simple preparation method and low product performance

Inactive Publication Date: 2011-12-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oxalic acid is directly used as a comonomer, although it is mentioned in the CN200610020398.0 patent that it is used to replace part of the diacid copolymerization as a polyester material for high-shrinkage films, but on the one hand, due to the strong acidity of oxalic acid, it is difficult to direct copolymerization
On the other hand, the patent does not mention the use of biodegradable

Method used

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  • Preparation method of polyethylene terephthalate copolyester
  • Preparation method of polyethylene terephthalate copolyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 182 parts (mass) of terephthalic acid, 288 parts of ethylene glycol, 194 parts of dimethyl oxalate, and 0.12 parts of ethylene glycol antimony into the batch reactor, at 220-250 °C and a pressure of 0.25 MPa (gauge pressure) Esterification and transesterification, when the water output reaches 95% of the theoretical water output, the esterification is completed, the pressure of the reactor is released to normal pressure, and after adding 0.025 parts of trimethyl phosphate, gradually reduce the pressure and increase the temperature, and the vacuum of the reactor reaches 90Pa after 45 minutes (absolute pressure), the reaction temperature is maintained at 270 ~ 280 ° C, and after 110 minutes of polymerization, the polymerization reaction is completed when the rated stirring power is reached, the vacuum is eliminated with nitrogen, and a kind of polyethylene terephthalate can be obtained by water cooling and pelletizing Acid Ethylene Glycol Copolyester. The intrinsic vi...

Embodiment 2

[0041] Add 330 parts of terephthalic acid, 220 parts of ethylene glycol, 12.5 parts of dimethyl oxalate, and 0.12 parts of ethylene glycol antimony into the batch reactor, and perform esterification and Transesterification, when the water output reaches 95% of the theoretical water output, the esterification is completed, the pressure of the reactor is released to normal pressure, and after adding 0.025 parts of trimethyl phosphate, the pressure is gradually reduced and the temperature is raised. After 45 minutes, the vacuum of the reactor reaches 90Pa, and the reaction temperature Maintain the temperature at 280-285°C, and after 88 minutes of polymerization, the polymerization reaction will be terminated when the rated stirring power is reached, and the vacuum will be eliminated with nitrogen, cooled by water, and pelletized to obtain a polyethylene terephthalate copolyester . The intrinsic viscosity of the copolyester is 0.664dL / g, the terminal carboxyl group is 18.4mol / ton,...

Embodiment 3

[0043] 83 parts of dimethyl oxalate, 88 parts of ethylene glycol, and 0.07 parts of manganese acetate were subjected to transesterification at 140-220°C under normal pressure. Formic acid, 173 parts of ethylene glycol, 0.12 parts of ethylene glycol antimony, esterify at 220-250°C and a pressure of 0.25 MPa (gauge pressure), the esterification is completed when the water output reaches 95% of the theoretical water output, and the pressure of the reactor is released. To normal pressure, after adding 0.025 parts of triethyl phosphate, gradually reduce the pressure and increase the temperature. After 45 minutes, the vacuum of the reactor reaches 90Pa, and the reaction temperature is maintained at 275-285°C. After 77 minutes of polymerization, the polymerization reaction is terminated when the rated stirring power is reached. , Use nitrogen to eliminate the vacuum, cool with water, and pelletize to obtain a polyethylene terephthalate copolyester. The copolyester has an intrinsic vi...

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Abstract

The invention discloses a preparation method of polyethylene terephthalate (ethylene glycol) terephthalate copolyester, which uses oxalate as a comonomer to prepare polyethylene terephthalate with terephthalic acid, its ester, and ethylene glycol. Ethylene glycol dicarboxylate copolyester. The melting point of the copolyester of the present invention is 210-250° C., the intrinsic viscosity is 0.3-1.5 dL / g, and has biodegradability. Compared with the biodegradable PET copolyester prepared by other methods, the preparation method is simple, the raw material cost is low, and the difference between the product performance and PET is small. Copolyesters can be used in the manufacture of fibers, films, sheets, bottles and other plastics.

Description

technical field [0001] The invention belongs to the field of polyester preparation, and in particular relates to a preparation method of polyethylene terephthalate copolyester. Background technique [0002] Polyethylene terephthalate (PET) has excellent performance in terms of crystallinity, mechanical properties such as strength, chemical resistance, heat resistance, electrical properties, and transparency. It is used in films, fibers, bottles, and extruded products. It is widely used in various purposes, and the production capacity of polyethylene terephthalate in my country has reached 25 million tons. In some applications that are not easy to recycle, it is precisely because of the above-mentioned excellent properties of polyethylene terephthalate that some white pollution exists. In order to avoid this problem and improve the biodegradability of polyester, the following methods have been proposed to solve it. [0003] Copolymerization with aliphatic diacids such as lac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78D01F6/84C08L67/02
Inventor 魏高富戴志彬夏峰伟
Owner CHINA PETROLEUM & CHEM CORP
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