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Aromatic polyesters acetaldehyde capture agent as well as method for preparing polyester blend thereby and product thereof

A technology of aromatic polyester and scavenger, applied in the field of acetaldehyde scavenger, can solve the problems of product quality deterioration, PET thermal cracking, limited and other problems, and achieve the effect of increasing, decreasing, and reducing acetaldehyde content

Inactive Publication Date: 2008-07-23
FAR EASTERN NEW CENTURY COPRRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, whether a nitrogen-containing acetaldehyde scavenger is mixed with PET or a nitrogen-containing substance is added to the melt of the PET process, the nitrogen-containing substance will form a conjugated imine (conjugated imine) with acetaldehyde, resulting in ester The hue of the granules turns yellow, which limits its use in packaging and container products; similarly, the use of titanium catalysts also has the disadvantage of turning the granules yellow.
[0006] In addition, when polyvinyl alcohol, ethylene-vinyl alcohol copolymer or polyols are used to mix PET ester pellets, because the heat resistance of these materials is not enough, cracking occurs due to heat during processing, which will not only cause product coloring , and the cracked products may further promote thermal cracking of PET, resulting in product quality deterioration
As for the way of adding stabilizers and antioxidants, the effect of reducing the content of acetaldehyde is still very limited.

Method used

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  • Aromatic polyesters acetaldehyde capture agent as well as method for preparing polyester blend thereby and product thereof
  • Aromatic polyesters acetaldehyde capture agent as well as method for preparing polyester blend thereby and product thereof
  • Aromatic polyesters acetaldehyde capture agent as well as method for preparing polyester blend thereby and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I-1～I-12

[0044] will PET I Dry the ester grains at 130°C for 6 hours, and dry the PBT ester grains at 100°C for 4 hours, and then take the dried PET grains separately. I Ester granules and PBT ester granules are mixed to form a total of 3 kilograms of polyester blends. In each of these polyester blends, the PBT content (in the form of PBT+PET I =100wt% meter) as shown in Table 2. Add each of the polyester blends into the hopper of the twin-screw extruder for twin-shaft mixing, the final vacuum pressure of the polyester blends with different PBT contents, and the polyester blend after extrusion. The chemical properties of the compounds are detailed in Table 2.

[0045] Table 2

[0046]

[0047]

[0048] In Table 2, the degree of vacuum refers to the pressure value of the evacuated environment at the end of the twin-screw extruder, where the normal pressure refers to the pressure when the vacuum is not evacuated. The data of embodiment I-12 shows, under the state of normal pres...

Embodiment II-1～II-6

[0052] The difference between embodiment II and embodiment I is to replace PBT with PBTI (poly(terephthalate-isophthalate) butylene glycol ester) as acetaldehyde capture agent and PET I Mix well to form a polyester blend. Here, 3 kilograms of samples were prepared under the conditions of Examples II-1 to II-4, and 10 kilograms of samples were prepared under the conditions of II-5 and II-6, and then samples were taken for processing and analysis.

[0053] The amount of PBTI added and the pressure of the vacuum environment in each example are shown in Table 3, and the chemical analysis results of the blended polyester blend are also shown in Table 3.

[0054] table 3

[0055]

[0056] The data in Table 3 shows that adding PBTI as an acetaldehyde scavenger can also reduce the acetaldehyde content in polyester blends, and the lower the pressure of the vacuum environment, the better the effect of reducing acetaldehyde content.

Embodiment III-1～III-6

[0058] The difference between embodiment III and embodiment I is to replace PBT with PPT (polytrimethylene terephthalate) as acetaldehyde trapping agent and PET I Uniformly mixed to form a polyester blend, where the amount of PPT added and the property test results of the blended polyester blend are listed in Table 4.

[0059] Table 4

[0060]

[0061] In the present embodiment, different contents of PPT are matched with the same vacuum environment of 76 torr pressure, which can reduce H-AA by about 80%, and the decline rate of E-AA is about 65%. The results are used in the same way as in Example 1 The results for 76 torr pressure are similar, showing that lower vacuum ambient pressure (higher vacuum) can enhance the effect of reducing acetaldehyde content.

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Abstract

The invention discloses an aromatic polyester acetaldehyde scavenger used for reducing the content of acetaldehyde in polyester, which is a product of at least an aromatic dicarboxylic acid and / or ester derivatives of the dicarboxylic acid with eight to sixteen carbon atoms reacting with at least an aromatic polyester and / or aromatic copolyester which has three to fifteen carbon atoms and is produced by diol compounds.

Description

technical field [0001] The invention relates to an acetaldehyde scavenger for reducing the acetaldehyde content in polyester blends, in particular to an aromatic polyester acetaldehyde scavenger. Background technique [0002] Since containers made of polyethylene terephthalate (PET) have the advantages of stable chemical properties, good barrier properties, light weight, low price, and recyclability, they have been widely used in the preparation of food, Beverages, etc., such as packaging containers for carbonated drinks, mineral water, fruit juice, edible oil, etc. [0003] However, during the production process of PET polyester, such as synthesis, solid state polymerization, and processing (such as injection molding, blow molding), etc., acetaldehyde is easily generated due to thermal cracking. When PET polyester is used to manufacture beverage or drinking water packaging bottles, if the acetaldehyde content in the polyester is too high, the acetaldehyde in the polyester ...

Claims

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Application Information

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IPC IPC(8): C08G63/181C08G63/16C08L67/03
Inventor 吴汝瑜王震纲
Owner FAR EASTERN NEW CENTURY COPRRATION
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