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The preparation method of modified copolyester

A copolyester and modification technology, which is applied in the field of preparation of modified copolyester, can solve problems such as poor hue, inability to effectively increase the glass transition temperature of modified copolyester, and large water by-products, so as to reduce the occurrence of Effects of other side reactions, improvement of overall reactivity and reaction efficiency, and saving of water by-products

Inactive Publication Date: 2017-08-15
FAR EASTERN NEW CENTURY COPRRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method of this patent improves the reactivity of isosorbide, the final modified copolyester product still has the inability to effectively increase the glass transition temperature (Tg), poor hue (yellowish) and a large amount of water by-products The problem

Method used

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  • The preparation method of modified copolyester
  • The preparation method of modified copolyester
  • The preparation method of modified copolyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0070] Preparation of modified copolyesters (using ethylene carbonate and isosorbide)

[0071] The modified copolyester of embodiment 1~5 is to change the kind and usage amount of each raw material according to table 1, and make according to the following steps:

[0072] Step (1): Uniformly mix terephthalic acid (TPA) and ethylene carbonate (EC) at 50° C. to prepare a mixture.

[0073] Step (2): Add tetraethylammonium hydroxide (TEAH, ring-opening catalyst) to the mixture, and perform a ring-opening reaction at 150° C. to form mono(2-hydroxyethyl) terephthalate The reaction mixture of the main reactants.

[0074] Step (3): adding isosorbide (ISOS) to the reaction mixture, and carrying out esterification reaction at a temperature of 220° C. and a pressure of ambient pressure, until the conversion rate reaches 95%, forming a precursor, wherein, the The precursor contains an oligomer (main component) having a low degree of polymerization formed of terephthalate monomer units re...

Synthetic example 1

[0084] Two (2-hydroxyethyl) isosorbides (BHEIS) are prepared with reference to Example 1 of US 6,608,167B1

[0085] Mix 146.1g of isosorbide, 184.93g of ethylene carbonate and 1.66g of potassium carbonate, pass through a small amount of nitrogen, then gradually raise the temperature to 150°C, and continue the reaction until the by-product CO 2 The generation of bubbles stopped, cooled to room temperature, and vacuum distillation was carried out to remove unreacted substances to obtain bis(2-hydroxyethyl)isosorbide.

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Abstract

A method for preparing a modified copolyester, comprising the following steps: (1) preparing a mixture comprising a diacid or its alkyl ester and at least one cyclic carbonate compound represented by formula (I): X is a C2-C10 divalent aliphatic hydrocarbon group or a C2-C10 divalent aliphatic hydrocarbon group containing at least one substituent, the substituent being hydrogen, a C1-C4 alkyl group or a C2-C4 alkenyl group; (2) adding a ring-opening catalyst to In the mixture, a ring-opening reaction is carried out to form a reaction mixture; (3) isosorbide is added to the reaction mixture to carry out an esterification reaction to form a precursor; and (4) in the presence of a polycondensation catalyst, the precursor is subjected to Polycondensation reaction to obtain modified copolyester. The method of the invention can improve the reactivity of isosorbide, reduce the generation of water by-products, and at the same time improve the glass transition temperature and color stability of the prepared modified copolyester.

Description

technical field [0001] The invention relates to a preparation method of modified copolyester, in particular to a preparation method of modified copolyester containing isosorbide comonomer unit. Background technique [0002] Polyethylene terephthalate (PET) has long been widely used in the field of filling materials, molded products and films, and belongs to a plastic that does not contain environmental hormones and is friendly to the environment. However, due to insufficient heat resistance, PET is easily bent and deformed in a high temperature environment, which limits the range of applicable fields. In order to improve the heat resistance of PET, most of them use comonomers to copolymerize with PET to change the structure of PET molecular chains, so as to reduce the mobility of PET molecular chains or change the crystallization form, thereby increasing the glass transition temperature (glass transition temperature) , referred to as Tg) and melting point properties. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/672C08G63/78
Inventor 吴汝瑜刘邦锦唐艺轩
Owner FAR EASTERN NEW CENTURY COPRRATION