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Copolyester composition with thermal stability

A thermal stability, copolyester technology, applied in the field of copolyester composition, can solve the problems of insufficient melting strength of branched copolyester, slow catalytic speed, polyester thermal cracking, etc., to reduce thermal cracking phenomenon, The effect of good thermal stability, good mechanical properties

Inactive Publication Date: 2012-05-30
FAR EASTERN NEW CENTURY COPRRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned methods to improve the melt strength cannot completely overcome the thermal cracking problem of polyester during high-temperature processing, so it is necessary to add a heat stabilizer to make the polyester have better thermal stability
However, after testing by the inventors of this case, it was found that when zinc salt was used alone as a catalyst, the thermal cracking of the finally obtained polyester was serious after repeated processing, which led to a decrease in the physical properties of subsequent products.
If sodium salt or manganese salt is used alone as a catalyst, the reaction cannot be completed in the twin-screw mixing process with a short residence time due to the slow catalytic speed, resulting in a decrease in the melt strength of the branched copolyester obtained after the reaction. insufficient

Method used

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  • Copolyester composition with thermal stability
  • Copolyester composition with thermal stability
  • Copolyester composition with thermal stability

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0036] Preparation of Polymer Chain Extender Containing Epoxy Functional Group

[0037] Free radical polymerization is adopted, toluene and azobisisobutyronitrile are used as solvent and initiator respectively, and styrene, methyl methacrylate and glycidyl methacrylate are used as polymerized monomers.

[0038] The present invention synthesizes three polymer chain extenders A, B and C containing epoxy functional groups, and the ratios of monomers and initiators are listed in Table 1. First, mix the monomers according to the ratio listed in the table, then add azobisisobutyronitrile, stir until completely dissolved, then drop it into a five-liter glass reaction tank containing toluene at a fixed flow rate. The reaction temperature is controlled at 85±5°C. After two hours of reaction, the product is vacuum-dried to remove the solvent to obtain a white powder polymer chain extender containing epoxy functional groups.

[0039] According to the ASTM D 1652 standard method, the ch...

Embodiment 1～4

[0044] 100 parts by weight of butanediol adipate-terephthalate copolyester (Far Eastern New Century Company, trade name) with biodegradable properties ), 0.65 parts by weight of the obtained macromolecular chain extender A and 0.065 parts by weight of the co-catalyst (according to the following table two select catalyst type and control weight ratio, directly two kinds of catalyst mixed to obtain) after uniform mixing , using a HAAKE plastic spectrometer and controlled at 200° C. and a rotation speed of 50 rpm, melted and blended for 20 minutes to obtain the copolyester compositions of Examples 1 to 4, respectively. During the melt blending process, the torque value of the copolyester composition (in Newton·meter, hereinafter denoted as "N·m") was measured every 0.5 minutes by a plastic spectrometer, and the obtained results are shown in Table 2 below. The higher the torque value, the stronger the melt strength of the copolyester composition. That is to say, the higher the d...

Embodiment 5～7 and comparative example 8

[0052] The preparation process and conditions of Examples 5-7 and Comparative Example 8 are the same as those of Example 1, the difference is that the amounts of chain extenders and co-catalysts are changed according to the following Table 3, and finally Examples 5-7 and Comparative Example 8 are respectively obtained. copolyester composition.

[0053] Also according to the test process of Example 1, the torque values ​​of Examples 5-7 and Comparative Example 8 were measured by a plastic spectrometer, and the gelation state was observed at the same time. The experimental results are summarized in Table 3.

[0054] Table three

[0055]

[0056] It can be seen from Table 3 that in Comparative Example 8, the amount of co-catalyst was less than 0.03 parts by weight and the amount of chain extender was less than 0.3 parts by weight, and the maximum torque value was too low, indicating that the effect of chain extension was not good and the increase in viscosity was not obvious; ...

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Abstract

The invention relates to a copolyester composition with thermal stability. The composition comprises aliphatic-aromatic copolyester, a high-molecular chain elongation agent containing epoxy functional group, and a cocatalyst. The cocatalyst is composed of manganese carboxylate and zinc carboxylate with a weight ratio of 1:3-3:1. If the weight of the aliphatic-aromatic copolyester is considered as 100 parts, the dosage of the cocatalyst is 0.03-0.2 parts. The copolyester composition comprises good thermal stability. After a plurality times of high-temperature post-processing, the degree of thermal cracking is relatively low, and good mechanical properties are maintained.

Description

technical field [0001] The invention relates to a copolyester composition, in particular to a copolyester composition with thermal stability. Background technique [0002] In the past, linear polyesters, such as polyethylene terephthalate (PET for short) and polybutylene terephthalate (PBT for short), had good mechanical, optical and durability properties. Chemical properties, are widely used in various vacuum or pressure forming plastic products. However, due to the linear structure and low molecular weight of this type of polyester, the melt strength is not enough, which is not conducive to processing, especially it cannot be directly applied to blown film processing or foaming process. In order to solve the above problems, most of the existing technologies increase the molecular weight and branched chain of linear polyesters by adding multifunctional coupling agents (or called chain extenders), that is, to convert linear polyesters into branched chains. Chain-type polye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G81/02C08L67/00C08L67/02C08K3/34C08K5/098
Inventor 郭芝颖徐传浩邱麒维张莉苓吴汝瑜
Owner FAR EASTERN NEW CENTURY COPRRATION
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