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Long-chain branched PETG copolyester and preparation method thereof

A long-chain branched, copolyester technology, applied in the polymer field, can solve the problems of weak melt elasticity, low melt strength, low heat distortion temperature, etc., and achieve good melt strength and tear strength, excellent physical The effect of easy control of mechanical properties and reaction conditions

Active Publication Date: 2022-01-14
DALIAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as an emerging material, PETG copolyester is not perfect. It has the inherent shortcomings of polyester polymers, such as low melt strength, weak melt elasticity, and strain softening during elongation flow, etc., which in turn affects the line shape. Application of PETG in extrusion foaming, thermoforming, melt spinning and 3D printing
In addition, PETG copolyester also has disadvantages such as low heat distortion temperature, these factors restrict the further promotion and application of PETG copolyester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0019] Esters were prepared from 38.84 g dimethyl terephthalate (DMT), 12.97 g ethylene glycol (EG), 1.59 g distilled 1,4 cyclohexanedimethanol (CHDM) and 0.021 g branching agent glycerol The product wherein the CHDM content of the copolyester is 5% (mol) of the total glycol content, the molar ratio of the total glycol to dimethyl terephthalate is 1.1:1, and the branching agent glycerol is 0.1% of total diol moles. Put DMT, EG, CHDM and branching agent into a pre-dried 100mL four-necked flask, connect the condensing device and mechanical stirring device, install the thermometer, add 0.0068g of esterification catalyst tetrabutyl titanate, the amount of catalyst 0.01% of the amount of DMT, heated in an oil bath at 140° C. and stirred for 1 hour, melted and stirred DMT, diol and branching agent until uniformly mixed. Esterification and dehydration were carried out at 180° C. for 4 hours at a nitrogen inflow and outflow rate of 0.5 L / min to obtain an esterification product of eth...

Embodiment 2

[0022] Esters were prepared from 38.84 g dimethyl terephthalate (DMT), 30.94 g ethylene glycol (EG), 20.85 g distilled 1,4 cyclohexanedimethanol (CHDM), and 1.326 g branching agent glycerol The CHDM content of wherein copolyester is 30% (mole) of total glycol content, and the molar ratio of total glycol and dimethyl terephthalate is 2.4: 1, and branching agent glycerol is 3% of total diol moles. Put DMT, EG, CHDM and branching agent into a pre-dried 100mL four-neck flask, connect the condensing device and mechanical stirring device, install the thermometer, add 0.2041g of tetrabutyl titanate esterification catalyst, catalyst dosage 0.3% of the amount of DMT, heated in an oil bath at 140° C. and stirred for 1 hour, melted and stirred DMT, diol and branching agent until uniformly mixed. Esterification and dehydration were carried out at 195°C for 2 hours at a rate of 0.5 L / min in and out of nitrogen to obtain the esterification product of ethylene glycol terephthalate-1,4 cyclo...

Embodiment 3

[0025] Esters were prepared from 38.84 g dimethyl terephthalate (DMT), 23.21 g ethylene glycol (EG), 9.52 g distilled 1,4 cyclohexanedimethanol (CHDM), and 2.026 g branching agent glycerol The product, wherein the CHDM content of copolyester is 15% (mole) of total glycol content, the molar ratio of total glycol and dimethyl terephthalate is 2.2:1, branching agent glycerol is 5% of total glycol moles. Put DMT, EG, CHDM and branching agent into a pre-dried 100mL four-neck flask, connect the condensing device and mechanical stirring device, install the thermometer, add 0.2215g of esterification catalyst antimony acetate, the amount of catalyst is DMT 0.5% by mass, heated in an oil bath at 140° C. and stirred for 1 hour, melted and stirred DMT, diol and branching agent until uniformly mixed. Esterification and dehydration were carried out at 190° C. for 1 hour at a nitrogen rate of 0.5 L / min to obtain an esterification product of ethylene glycol terephthalate-1,4-cyclohexanedimet...

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Abstract

The invention provides a long-chain branched PETG copolyester and a preparation method thereof, and belongs to the technical field of macromolecules. In the long-chain branched PETG copolyester, repetitive structural units forming a main chain and branched chains are copolyester, wherein a branching point on the main chain is a tertiary carbon atom in a polyester repeating structure unit on the main chain. The preparation method comprises the following steps: uniformly mixing dimethyl terephthalate (DMT), ethylene glycol (EG), 1, 4-cyclohexanedimethanol (CHDM) and a branching agent, performing esterification reaction, and performing condensation polymerization to form a long-chain branched structure. Compared with traditional PETG copolyester, introduction of the branched structure provides entanglement interaction between chains for the linear polyester material, the problems of low melt strength and the like of the traditional linear polyester are solved, and the application of the linear polyester in the effective expansion fields of extrusion foaming, thermal forming, melt spinning, 3D printing and the like are effectively expanded.

Description

technical field [0001] The invention belongs to the technical field of polymers, and relates to a long-chain branched PETG copolyester and a preparation method thereof. Background technique [0002] Polyethylene terephthalate glycol-1,4 cyclohexanedimethanol copolyester, referred to as PETG, is a new type of amorphous polyester material. Compared with other polyester materials, it is very environmentally friendly, so it is widely used in the field of food plastic packaging. In addition to the advantages of environmental protection, PETG copolyester also has good heat resistance and can act as a container for high-temperature materials. It can be seen that the emergence of PETG copolyester not only provides convenience for the development of chemical enterprises, but also enriches people's daily life. Therefore, the production and performance research of PETG copolyester is particularly important and should be highly valued by people. . [0003] However, as an emerging mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/85C08G63/86
CPCC08G63/20C08G63/85C08G63/866
Inventor 冷雪菲刘杰
Owner DALIAN UNIV OF TECH