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Method of preparing polyester with low content of acetaldehyde

A technology with low acetaldehyde and content, applied in the field of polyester production, can solve problems such as non-compliance with industry requirements, lower b value of polyester appearance and performance, and yellowing of polyester color and luster.

Inactive Publication Date: 2007-08-08
SINOPEC OILFIELD SERVICE CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent involves the compounding of antioxidants, the b value of the polyester appearance performance has decreased by 20% to 30%, and the b value is still relatively high. The yellowing of the obtained polyester does not meet the current industry requirements

Method used

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Examples

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Effect test

preparation example Construction

[0029] Based on the deficiencies in the prior art, the present invention proposes a method for preparing polyester with excellent appearance and low acetaldehyde content from the reaction of dicarboxylic acid, glycol and polyester catalyst, so as to improve the thermal stability of the obtained polyester , Appearance performance, and significantly reduce the content of acetaldehyde. Its preparation method includes: adding compound additives to polyester containing polymerization catalysts in time and sections during the whole polymerization molding process of melt polycondensation, pelletizing, drying and solid-state polymerization, through compound additives and polymerization catalysts and The function of the polyester body selectively reduces the acetaldehyde content of the obtained polyester or improves the thermal stability of the polyester or maintains the good appearance of the polyester, or all three properties are improved.

[0030] The dicarboxylic acid of the presen...

Embodiment 1

[0070] The polyester PET without compound additives was used as the control polyester PET. The % reduction of AA is the percentage reduction of the amount of AA in the control sample. The additive concentration is based on parts per million (ppm) of PET, and the polyester acetaldehyde content refers to the acetaldehyde concentration in the polyester after solid phase tackification (SSP). The results are summarized in Table 1.

[0071] Table 1

[0072]

[0073] F

[0074] In Table 1, the organic phosphate is triethyl phosphate, the hindered phenol is bis(3,5-di-tert-4-hydroxybenzyl monoethyl phosphate) calcium, and the amino compound is anthranilamide. As can be seen from Table 1, the appropriate timing for adding organic phosphate triethyl phosphate and hindered phenol bis(3,5-di-tert-4-hydroxybenzyl monoethyl phosphate) calcium is when the melt segment is esterified Adding, while the small molecule amino compound anth...

Embodiment 2

[0076] Polyester PET without additives was used as the control PET, and the average acetaldehyde content of PET without additives was 2.5 ppm after solid-state polycondensation (SSP), indicating that undesired acetaldehyde AA was generated during thermal processing. During melt esterification, different amounts of triethyl phosphate were added to investigate the acetaldehyde content of polyester PET. The results are summarized in Table 2.

[0077] Table 2

[0078]

[0079] The hindered phenol was calcium bis(3,5-di-tert-4-hydroxybenzyl monoethylphosphate). It can be seen from Table 2 that triethyl phosphate of organophosphates can effectively reduce the acetaldehyde content of PET relative to control 2.

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Abstract

The invention discloses a making method of low-acetaldehyde polyester, which is characterized by the following: adopting pure terephthalic acid (PTA) and ethylene glycol (EG) as raw material; adding built additive in the fusing polyetherifying segment, polycondensation segment and solid polymerizing course; selecting built additive from (1) heat stabilizer with phosphor, (2) anti-oxidant, (3) low-molecular weight amino compound, amide compound and polyhydroxy compound.

Description

technical field [0001] The invention relates to a production method of polyester, in particular to a production method of polyester with excellent appearance and low acetaldehyde content that can be used as beverage bottles and other food packaging containers, and belongs to the technical field of polyester synthesis. Background technique [0002] Acetaldehyde (AA) in polyethylene terephthalate (PET) is mainly produced by thermal degradation and thermo-oxidative degradation reactions during the polymerization process. The main ways to generate AA are: 1) PET molecular chain terminal decomposition, including terminal carboxyl decomposition and terminal vinyl decomposition; 2) PET molecular chain interchain cracking to generate terminal vinyl, and terminal vinyl decomposes to generate acetaldehyde; 3) metal catalyst Coordinate with terminal hydroxyl groups to generate acetaldehyde; 4) Further decomposition of small molecules (such as 2-methyl-1,3-dioxolane) (Kishan C, Khemani....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/80C08G63/183C08K5/524
Inventor 王金堂王余伟杨钟
Owner SINOPEC OILFIELD SERVICE CORPORATION
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