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Production method of low-acetaldehyde titanium system polyester

A technology of titanium-based polyester and production method, which is applied in the field of low-acetaldehyde titanium-based polyester and can solve the problem of high residual acetaldehyde

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is the problem of high residual acetaldehyde in polyester prepared by titanium-based catalysts in the past, and a new production method of low-acetaldehyde titanium-based polyester is provided

Method used

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  • Production method of low-acetaldehyde titanium system polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation of catalyst A

[0058] Add 12.4 g (0.2 mol) of ethylene glycol to the reactor equipped with a stirrer, condenser and thermometer, and slowly drop 28.4 g (0.1 mol) of tetraisopropyl titanate into the reactor, and a white precipitate is deposited. The reaction was carried out at 70°C for 2 hours, the product was centrifuged, and the residue was washed with distilled water 3 times, and the product was vacuum dried at 70°C to obtain a white powdery substance.

[0059] Place the dried white powdery substance in a reactor equipped with a stirrer, a condenser and a thermometer, add 50 grams of ethylene glycol, 48 grams of 25wt% sodium hydroxide aqueous solution (0.3 mol), and 64.2 grams of magnesium acetate ( 0.3 mol), 18 g (0.2 mol) of lactic acid, 25.2 g (0.18 mol) of trimethyl phosphate, reacted at a reaction temperature of 150°C for 2 hours to obtain a nearly colorless homogeneous liquid, which is catalyst A.

[0060] Preparation of polyester

[0061] 600 grams of ter...

Embodiment 2

[0067] Except that the nitrogen flow rate during the solid-phase polymerization was changed to 3 L / min, the same method as in Example 1 was used to carry out the preparation of polyester and the solid-phase polymerization of polyester.

[0068] The test results are shown in Table 1.

[0069]

Embodiment 3

[0071] Except that the nitrogen flow rate during the solid-phase polymerization was changed to 5 L / min, the same method as in Example 1 was used for the preparation of polyester and the solid-phase polymerization of polyester.

[0072] The test results are shown in Table 1.

[0073]

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Abstract

The invention relates to a production method of low-acetaldehyde titanium system polyester, which is mainly used for solving the problem of relatively large amount of acetaldehyde residue in the polyester prepared by use of a titanium system catalyst before. The technical scheme adopts a catalyst obtained by the reactions of the following raw materials: (1) a titanium compound A:Ti(OR)4 with the general formula shown in the specification, wherein R is straight-chain or branched alkyl with 1-10 carbon atoms; (2) diol B with 2-10 carbon atoms; (3) a metal compound C selected from the periodic table of elements IA; (4) at least one aliphatic organic acid D selected from organic acids; (5) at least one phosphate compound E selected from phosphorus compounds; and (6) at least one metal compound F selected from IIA, IB, IIB, VIIB and VIII of the periodic table of elements. The technical scheme can be used for solving the problem relatively well and can be applied to industrial production of polyester with low acetaldehyde residue.

Description

Technical field [0001] The invention relates to a method for producing low-acetaldehyde titanium series polyester and a method for reducing the content of acetaldehyde in the titanium series polyester. [0002] Background technique [0003] Polyethylene terephthalate is an important industrial raw material. Due to its excellent chemical and physical properties, it is widely used in fibers, films, sheets, bottles and other materials. It has excellent mechanical strength, chemical stability, gas barrier properties, aroma retention, sanitation, etc., is inexpensive and light in weight, and is particularly suitable for manufacturing beverage containers that require heat sterilization and filling. [0004] At present, the polyester catalysts that are more industrially produced and studied are mainly three series of antimony, germanium and titanium catalysts. Among them, the most commonly used in polyester industrial installations are antimony catalysts (including antimony trioxide, anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/86C08G63/85C08G63/83C08G63/82C08G63/80C08G63/183
Inventor 关震宇熊金根周文乐王睿郁剑乙章瑛虹
Owner CHINA PETROLEUM & CHEM CORP
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