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Preparation method of foamable polyethylene terephthalate copolyester

A technology of ethylene glycol phthalate copolyester and terephthalic acid, which is applied in the field of polymer synthesis, can solve problems such as low melt viscosity and melt strength, easily broken foaming bubbles, and insufficient cooling, and achieve The effect of high molecular weight and high melt strength

Active Publication Date: 2013-03-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, PET is a linear crystalline polymer material. Most industrial PET resins with low molecular weight and narrow molecular weight distribution and related general polyester polymers have low melt viscosity and melt strength above the melting point. Foaming bubbles are easily broken because they cannot be maintained, and before they crystallize and solidify below the melting point, they cannot be cooled sufficiently to avoid foam collapse, so general polyester resins are not easy to foam.

Method used

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  • Preparation method of foamable polyethylene terephthalate copolyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a 20-liter polymerization reactor, 5100 grams of high-purity terephthalic acid, 900 grams of isophthalic acid, 3600 grams of ethylene glycol and 12 grams of trimellitic anhydride were added. To the reaction mixture was added 1.70 g of antimony glycolate. After replacing three times with high-purity nitrogen, adjust the initial pressure to 0.10Mpa. Heat to warm and stir. The esterification reaction is carried out at a pressure of 0.15-0.50Mpa and a temperature of 180-240°C. When the water output reaches 1200 grams, the pressure is released, the esterification reaction is completed, and the temperature is raised and the pressure is reduced. The polycondensation is carried out at an absolute pressure of 20-120 Pa and a temperature of 260-290° C., and the end point of the polycondensation reaction is determined according to the electric current of the stirring motor to obtain PET slices.

Embodiment 2

[0020] In a 20-liter polymerization reactor, add 4800 grams of high-purity terephthalic acid, 1200 grams of isophthalic acid, 3600 grams of ethylene glycol and 12 grams of trimellitic anhydride. To the reaction mixture was added 1.70 g of antimony glycolate. After replacing three times with high-purity nitrogen, adjust the initial pressure to 0.10Mpa. Heat to warm and stir. The esterification reaction is carried out at a pressure of 0.15-0.50Mpa and a temperature of 180-240°C. When the water output reaches 1200 grams, the pressure is released, the esterification reaction is completed, and the temperature is raised and the pressure is reduced. The polycondensation is carried out at an absolute pressure of 20-120 Pa and a temperature of 260-290° C., and the end point of the polycondensation reaction is determined according to the electric current of the stirring motor to obtain PET slices.

Embodiment 3

[0022] In a 20-liter polymerization reactor, 4800 grams of high-purity terephthalic acid, 900 grams of isophthalic acid, 265 grams of adipic acid, 3600 grams of ethylene glycol and 6 grams of trimellitic anhydride were added. To the reaction mixture was added 1.70 g of antimony glycolate. After replacing three times with high-purity nitrogen, adjust the initial pressure to 0.10Mpa. Heat to warm and stir. The esterification reaction is carried out at a pressure of 0.15-0.50Mpa and a temperature of 180-240°C. When the water output reaches 1200 grams, the pressure is released, the esterification reaction is completed, and the temperature is raised and the pressure is reduced. The polycondensation is carried out at an absolute pressure of 20-120 Pa and a temperature of 260-290° C., and the end point of the polycondensation reaction is determined according to the electric current of the stirring motor to obtain PET slices.

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Abstract

The invention discloses a preparation method of a foamable polyethylene terephthalate copolyester. The preparation method comprises the following steps: carrying out an esterifying reaction of terephthalic acid and glycol, and carrying out a condensation polymerization reaction, wherein diacids except terephthalic acid, polyprotic acid containing more than two functional groups, and polybasic acid anhydride or polyol are added in the esterifying reaction. A resin prepared through the method has the advantages of high melt strength, high mechanical performances, high heat resistance, direct extrusion foaming, low temperature of the foaming processing technology, and production energy consumption reduction.

Description

technical field [0001] The invention relates to the preparation of high molecular copolyester, more specifically, relates to the preparation method of high melt strength copolyester which can be used for supercritical injection molding or supercritical extrusion foaming, and belongs to the technical field of high molecular synthesis. Background technique [0002] Foamable thermoplastic polymer materials and foamed products have the advantages of light weight, heat insulation, insulation, high strength, etc., and can be made into products such as films, trays, electrical parts, furniture decoration components, etc., and are widely used in packaging, transportation, etc. Transportation, construction, aerospace and many other fields. For example, using the co-extrusion method, the density produced is 0.1-0.5g / cm 3 Polypropylene (PP) foam sheets can be used not only for food or meat packaging, but also for making thin shell products and various utensils such as plates, plates, ...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/672C08G63/78
Inventor 李乃祥
Owner CHINA PETROLEUM & CHEM CORP
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