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Copolyester, preparation method and application thereof

A technology of copolyester and esterification reaction, applied in the field of polymer materials, can solve the problems of insufficient anti-drop ability, inability to meet the anti-drop performance, cracking of packaging products, etc., and achieve good anti-drop performance, good light transmittance, and satisfactory Anti-drop effect

Active Publication Date: 2013-05-08
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing polyethylene terephthalate has insufficient drop resistance when it is made into sheets and packaging products made by secondary processing methods such as blistering. During storage and transportation, the packaging products will be damaged due to falling. Cracked, unable to meet the requirements of anti-drop performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Put 4109g of terephthalic acid, 41.5g of isophthalic acid, 2100g of ethylene glycol, and 2.5g of antimony trioxide into the reactor, replace the air in the reactor with high-purity nitrogen, and fill it with 0.1MPa high-purity nitrogen. Heat to 240°C, carry out esterification reaction under the pressure of 0.2-0.4MPa, after the amount of water slipping out reaches 900g, add 98g of polyethylene glycol 200, 0.5g of butyl titanate, 2g of antioxidant 1010, 2g of antioxidant 168, continue the normal pressure reaction for 0.5h. Raise the temperature to 280°C, reduce the pressure in the reactor to less than 60 Pa within 45 minutes, continue the reaction for 2.5 hours, stop stirring, fill the reactor with high-purity nitrogen, cast strips, and water-cool and pelletize to obtain primary copolyester slice. After drying the primary copolyester chips, pre-crystallize at 150°C for 2 hours, and perform solid-state polycondensation at 220°C for 10 hours under a vacuum less than 60Pa....

Embodiment 2

[0055]Put 4067g of terephthalic acid, 83g of isophthalic acid, 2100g of ethylene glycol, and 2.5g of antimony acetate into the reaction kettle, replace the air in the reaction kettle with high-purity nitrogen, and fill it with 0.1MPa high-purity nitrogen. Heat to 240°C, carry out esterification reaction under the pressure of 0.2-0.4MPa, after the amount of water slipping out reaches 900g, add 150g of polyethylene glycol 400, 0.6g of isopropyl titanate, 2g of antioxidant 1010, 2g of antioxidant Agent triphenyl phosphate, continue normal pressure reaction 2h. Raise the temperature to 275°C, reduce the pressure in the reactor to below 60Pa within 45 minutes, continue the reaction for 2.5 hours, stop stirring, fill the reactor with high-purity nitrogen, cast strips, water-cooled and cut into pellets to obtain the primary copolyester slice. After drying the primary copolyester chips, pre-crystallize at 190°C for 2 hours, and perform solid-state polycondensation at 220°C for 8 hour...

Embodiment 3

[0057] Put 4026g of terephthalic acid, 125g of isophthalic acid, 2100g of ethylene glycol, and 2.5g of antimony in ethylene glycol into the reactor, replace the air in the reactor with high-purity nitrogen, and fill it with 0.1MPa high-purity nitrogen. Heat to 240°C, carry out esterification reaction under the pressure of 0.2-0.4MPa, after the amount of water slipping out reaches 900g, add 250g of polyethylene glycol 300, 0.4g of isopropyl titanate, 2g of antioxidant 1010, 2g of antioxidant Add trimethyl phosphate, and continue the normal pressure reaction for 2h. Raise the temperature to 270°C, reduce the pressure in the reactor to below 60Pa within 45 minutes, continue the reaction for 2.5 hours, stop stirring, fill the reactor with high-purity nitrogen, cast strips, water-cooled and cut into pellets to obtain the primary copolyester slice. After drying the primary copolyester chips, pre-crystallize at 180°C for 2 hours, and perform solid-state polycondensation at 210°C for...

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Abstract

The invention discloses copolyester, a preparation method and an application thereof. The preparation method of the copolyester comprises the following steps of: adding acid components and an alcohol component to carry out esterification to obtain ester (A); and adding preheated polyethylene glycol, catalysts and stabilizing agents to the ester (A) to carry out transesterification and then carrying out polycondensation and solid phase tackifying reaction to obtain the copolyester, wherein the acid components include terephthalic acid and isophthalic acid; the alcohol component is ethylene glycol; the mole ratio of terephthalic acid to isophthalic acid is (19-99):1; the mole ratio of the alcohol component to the acid components is (1.1-1.4):1; and the weight ratio of polyethylene glycol to the acid components is (0.024-0.061):1. As polyethylene glycol in the specified proportion is added to prepare the copolyester, the copolyester has a good dropping resistance. The copolyester can be widely applied to the field of toy and food packaging.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a copolyester with good drop resistance, a preparation method and an application thereof. Background technique [0002] Polyethylene terephthalate is more and more widely used in the packaging industry due to its good transparency and non-toxicity. The existing polyethylene terephthalate has insufficient drop resistance when it is made into sheets and packaging products made by secondary processing methods such as blistering. During storage and transportation, the packaging products will be damaged due to falling. Cracked, unable to meet the requirements of anti-drop performance areas. Contents of the invention [0003] In order to solve the above problems, it is necessary for the present invention to provide a method for preparing a copolyester with good drop resistance. [0004] In addition, it is also necessary to provide a copolyester prepared by the above preparation met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08L67/02
Inventor 赵巍蔡彤旻徐依斌苑仁旭焦建钟宇科熊凯
Owner KINGFA SCI & TECH CO LTD
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