Modified aliphatic-aromatic copolyester and its preparation method and use

An aliphatic and aromatic technology, applied in the field of polyester, can solve the problems of high price of diacyl biscaprolactam, unfavorable industrial production, and difficulty in the diffusion of small molecules, so as to reduce thermal degradation reactions, shorten production cycles, and reduce degradation reactions. Effect

Active Publication Date: 2014-04-09
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the later stage of the polymerization reaction, the viscosity of the material becomes larger, and it is difficult for small molecules to diffuse in the melt. To obtain high-molecular-weight copolyesters, it is necessary to stay in the polycondensation tank for a long time, which will lead to degradation reactions and lead to resin degradation. The color turns yellow and the terminal carboxyl group increases, which reduces the performance of the product
Chinese patent CN200710177236.2 discloses a method for preparing high-viscosity polybutylene adipate by using binary oxazoline and diacyl biscaprolactam in combination with chain extension method, which can prepare polybutylene adipate with a viscosity of 1.1dL / g Resin, but in this method, diacyl biscaprolactam will produce small molecular compounds during chain extension, which will deteriorate the performance of the resin, and the price of diacyl biscaprolactam is relatively high, which is not conducive to industrial production

Method used

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  • Modified aliphatic-aromatic copolyester and its preparation method and use
  • Modified aliphatic-aromatic copolyester and its preparation method and use

Examples

Experimental program
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Effect test

preparation example Construction

[0056] Preparation of oxazoline compound masterbatch: (taking 1,3-bis(2-oxazoline)benzene as an example)

[0057] After mixing 1,3-bis(2-oxazoline)benzene 3Kg and polybutylene terephthalate-co-polybutylene adipate 7Kg in a high-speed mixer, drop into the twin-screw In the extruder, the temperature of the extruder is 120-150°C. After extrusion, strand drawing, water cooling, and pelletizing, the masterbatch of oxazoline compounds is obtained.

Embodiment 1

[0058] Example 1: Preparation of modified aliphatic-aromatic copolyester with high viscosity and low carboxyl content

[0059] Mix 1Kg P1, 30g 2-oxazolinylbenzene, and 4g hexamethylene diisocyanate in a high-mixer, and then put them into a twin-screw extruder. The temperature of the extruder is 180-220°C, and the modified aliphatic-aromatic copolyester P11 with high viscosity and low content of carboxyl groups is obtained through extrusion, strand drawing, water cooling and pelletizing.

Embodiment 2

[0060] Example 2: Preparation of modified aliphatic-aromatic copolyester with high viscosity and low carboxyl group content

[0061] Mix 1Kg P2, 30g 2-oxazolinylbenzene, and 8g ADR-4370S in a high-speed mixer, and then put them into a twin-screw extruder. The temperature of the extruder is 180-220°C, and the modified aliphatic-aromatic copolyester P12 with high viscosity and low content of carboxyl groups is obtained through extrusion, strand drawing, water cooling and pelletizing.

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Abstract

The invention belongs to the technical field of polyesters and discloses a modified aliphatic-aromatic copolyester having high viscosity and low carboxyl end group content and its preparation method and use. The modified aliphatic-aromatic copolyester comprises, by weight, 100 parts of a low-viscosity aliphatic-aromatic copolyester, 0.5-3 parts of an oxazoline compound and 0.4-2.5 parts of a hydroxyl chain extender. Through use of the oxazoline compound and the hydroxyl chain extender, the modified aliphatic-aromatic copolyester is prepared. The used oxazoline compound and the carboxyl end group in the resin undergo a reaction so that resin carboxyl end group content is reduced and resin hot-water resistance is improved. Through use of the hydroxyl chain extender, resin molecular weight is improved and the balance of physical properties and processing properties is realized. Viscosity and the melt-strength of the modified aliphatic-aromatic copolyester are improved, carboxyl end group content is reduced and hot-water resistance is improved. The preparation method has a short production period, reduces polycondensation time and effectively reduces thermal degradation reactions.

Description

technical field [0001] The invention belongs to the technical field of polyester, and in particular relates to a modified aliphatic-aromatic copolyester with high viscosity and low content of carboxyl groups and its preparation method and application. Background technique [0002] Every year tens of millions of tons of polyester plastic products are discarded in landfill or incinerated around the world. Disposal or incineration of polyester is harmful to the environment. Therefore, preparing biodegradable polyester instead of traditional polyester is an effective way to solve the above problems. The PET copolyester formed by the copolymerization of terephthalic acid, adipic acid and ethylene glycol has received extensive attention due to its good biodegradability, low production cost, good mechanical properties and processing properties. [0003] PET copolyester is mainly obtained through esterification, high temperature and high vacuum polycondensation reaction. In the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/00C08K5/353C08K5/29C08G63/183C08G63/16C08G63/78C08G63/85
Inventor 赵巍苑仁旭袁志敏焦建熊凯钟宇科徐依斌吴水珠
Owner KINGFA SCI & TECH CO LTD
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