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Method for producing low-acetaldehyde polyester product

A production method and low acetaldehyde technology, applied in the field of low acetaldehyde polyester products, can solve the problem of high residual acetaldehyde

Inactive Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] One of the technical problems to be solved by the present invention is the problem of high residual acetaldehyde after injection molding of polyester products prepared by titanium series catalysts, especially bottle flakes. A new production method of low acetaldehyde polyester is provided

Method used

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  • Method for producing low-acetaldehyde polyester product
  • Method for producing low-acetaldehyde polyester product
  • Method for producing low-acetaldehyde polyester product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Preparation of Catalyst A

[0073] 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 to obtain a white powdery substance.

[0074] The white powder material after drying is placed in the reactor that has agitator, condenser and thermometer, adds ethylene glycol 50 grams, 48 ​​grams of 25wt% sodium hydroxide aqueous solution (0.3 mole), magnesium acetate 42.8 grams ( 0.2 moles), 42 grams (0.2 moles) of citric acid monohydrate, and 42 grams (0.3 moles) 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.

[0075] Preparation of polyester ...

Embodiment 2

[0082] Except that catalyst A (based on the amount of polyester produced, the weight of titanium atoms was changed to 10ppmw), the same method as in Example 1 was used to carry out the preparation of polyester and the solid-phase polymerization of polyester.

[0083] The test results are shown in Table 1.

Embodiment 3

[0085] Except that catalyst A (based on the amount of polyester produced, the weight of titanium atoms was changed to 15 ppmw), the same method as in Example 1 was used to carry out the preparation of polyester and the solid-phase polymerization of polyester.

[0086] The test results are shown in Table 1.

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Abstract

The invention relates to a method for producing a low-acetaldehyde polyester product. The method is mainly used for solving the problem that the residual of acetaldehyde in polyester bottles prepared by a titanium-series catalyst is relatively high. According to the method, through adopting the technical scheme that a catalyst, which is prepared through carrying out a reaction on the following raw materials: (1) a titanium compound A with a general formula as follows: Ti(OR)4, wherein R is selected from C1-10 straight-chain or branched alkyl; (2) diol B with 2 to 10 carbon atoms; (3) a metal compound C selected from IA of the periodic table of elements; (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, is used, the problem is better solved, so that the method can be applied to the industrial production of polyesters with low acetaldehyde residual.

Description

technical field [0001] The invention relates to a method for low-acetaldehyde polyester products. Background technique [0002] 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, hygiene, etc., is cheap and light in weight, and is especially suitable for manufacturing beverage containers that require thermal sterilization and filling. [0003] 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 (including antimony trioxide, antimony acetate and ethylene dioxide) are the most commonly used in polyester industrial equipment. Alcohol antimony, etc.), at present more than 90% of the polyester in the wor...

Claims

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Application Information

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IPC IPC(8): C08G63/85C08G63/183
Inventor 关震宇周文乐熊金根王睿郁剑乙章瑛虹
Owner CHINA PETROLEUM & CHEM CORP
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