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Preparation method of polyester

A polyester and titanium-based polyester technology, applied in the field of polyester production, can solve the problems of poor light stability and storage stability of liquid titanium-based polyester catalysts, etc.

Active Publication Date: 2011-01-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of poor light stability and storage stability of liquid titanium-based polyester catalysts in the prior art, and a new method for producing polyester is provided

Method used

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  • Preparation method of polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of Catalyst A

[0034]Add 12.4 grams (0.2 mol) of ethylene glycol in the reactor that stirrer, condenser and thermometer are equipped with, slowly drop into reactor 28.4 grams (0.1 mol) tetraisopropyl titanate, separate out white precipitate, After reacting at 70°C for 2 hours, the product was centrifuged, and the residue was washed with distilled water three times, and the product was vacuum-dried at 70°C. A white powdery substance was obtained.

[0035] Place the dried white powdery substance in a reactor with a stirrer, a condenser and a thermometer, add 50 grams of ethylene glycol, 32 grams of 25% aqueous sodium hydroxide solution (0.2 moles), magnesium acetate tetrahydrate 21.4 gram (0.1 mole), 21 grams (0.1 mole) of citric acid monohydrate, and 14 grams (0.1 mole) of trimethyl phosphate were reacted for 2 hours at a reaction temperature of 150° C. to obtain a nearly colorless homogeneous liquid, which was catalyst A.

[0036] Preparation of polyester...

Embodiment 2

[0040] Catalyst A was placed under strong sunlight and irradiated continuously for 3 months. No change in the color and appearance of the catalyst was found. The catalytic performance was tested again. The results are shown in Table 1.

Embodiment 3

[0042] Catalyst A was placed in the room without being protected from light for one and a half years, and no change in the color and appearance of the catalyst was found. The catalytic performance was tested again, and the results are shown in Table 1.

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Abstract

The invention relates to a preparation method of polyester, mainly solving the problems of poor storing stability and easy changing of the colour of the liquid titanium-based polyester catalyst, and poor heat stability and bad hue of the polyester prepared in the prior art. According to the invention, dicarboxylic acids and dihydric alcohols are used as raw materials, and the raw materials are subjected to the esterification reaction to prepare a prepolymer with the presence of the titanium-based polyester catalyst under the reaction temperature of 230 to 280 DEG C and the reaction pressure of normal pressure to 0.5 MPa, and then the prepolymer is subjected to the polycondensation reaction to prepare the product of polyester under the reaction temperature of 250 to 320 DEG C and the vacuum condition with the reaction pressure less than 150 Pa. The technical scheme of the invention solves the problems preferably, and the preparation method can be used in the industrial production of polyester.

Description

technical field [0001] The present invention relates to a method for producing polyester. Background technique [0002] Polyethylene terephthalate (hereinafter referred to as polyester) is an important industrial raw material. Due to its various excellent properties, it can be widely used in fibers, bottles, films and other materials. It is the largest variety of synthetic fibers. It also has very important uses in engineering plastics and other industrial fields. [0003] Catalyst is an important link in the polyester production process. At present, the polyester catalysts with more industrial production and research are mainly three series of catalysts: antimony, germanium and titanium. Among them, antimony series catalysts are most commonly used in polyester industrial equipment ( including Sb 2 o 3 , SbAc 3 and ethylene glycol antimony, etc.), at present, more than 90% of the polyesters in the world are produced by antimony-based catalysts, and my country's polyester...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/85C08G63/183C08G63/83
Inventor 周文乐熊金根张惠明张俊
Owner CHINA PETROLEUM & CHEM CORP
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