High-melting-point biodegradable copolyester and preparation method thereof

A high melting point, copolyester technology, applied in the field of copolyester, can solve problems such as poor temperature resistance, achieve the effects of improving hydrophilicity, shortening preparation time, and increasing molar ratio

Active Publication Date: 2021-06-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a high melting point biodegradable copolyester and its preparation method, which can effectively solve the problem of poor temperature resistance existing in the existing copolyester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of high melting point biodegradable copolyester, its preparation method comprises the following steps:

[0024] (1) Add 2 mol parts of terephthalic acid, 3 mol of butanediol, 0.02 mol of polyethylene glycol with a molecular weight of 5000, and a tetrabutyl titanate catalyst into the reactor, and then react at 200°C and 60KPa for 6 hours under vacuum conditions, To obtain reactant A, the amount of tetrabutyl titanate accounts for 0.05% of the mass of reactant A;

[0025] (2) React 0.857 mol of adipic acid, 0.10 mol of isophthalic acid, 1.47 mol of butanediol and tetrabutyl titanate catalyst at 160°C and 60KPa vacuum conditions for 6 hours to obtain reactant B, tetrabutyl titanate The usage amount accounts for 0.05% of reactant B mass;

[0026] (3) react reactant A and reactant B at 230°C and 80Pa vacuum conditions for 4h to prepare.

Embodiment 2

[0028] A kind of high melting point biodegradable copolyester, its preparation method comprises the following steps:

[0029] (1) Add 2 mol of terephthalic acid, 3 mol of butanediol, 0.06 mol of polyethylene glycol with a molecular weight of 2000 and tetrabutyl titanate catalyst into the reactor, and then react at 220°C and 80KPa for 4 hours under vacuum conditions to obtain For reactant A, the amount of tetrabutyl titanate accounts for 0.05% of the mass of reactant A;

[0030] (2) React 1.077mol of adipic acid, 0.075mol of isophthalic acid, 1.8mol of butanediol and tetrabutyl titanate catalyst at 180°C and 80KPa vacuum for 4 hours to obtain reactant B, tetrabutyl titanate The usage amount accounts for 0.05% of reactant B mass;

[0031] (3) React reactant A and reactant B at 245°C and 70Pa vacuum for 5h to prepare.

Embodiment 3

[0033] A kind of high melting point biodegradable copolyester, its preparation method comprises the following steps:

[0034] (1) Add 2 mol of terephthalic acid, 3 mol of butanediol, 0.01 mol of polyethylene glycol with a molecular weight of 10,000 and tetrabutyl titanate catalyst into the reaction kettle, and then react at 210°C and 70KPa for 5 hours under vacuum conditions to obtain For reactant A, the amount of tetrabutyl titanate accounts for 0.05% of the mass of reactant A;

[0035] (2) React 1.33 mol of adipic acid, 0.067 mol of isophthalic acid, 2.2 mol of butanediol and tetrabutyl titanate catalyst at 170°C and 70KPa vacuum conditions for 5 hours to obtain reactant B, tetrabutyl titanate The usage amount accounts for 0.05% of reactant B mass;

[0036] (3) React reactant A and reactant B at 240°C and 90Pa vacuum for 5h to prepare.

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Abstract

The invention discloses a high-melting-point biodegradable copolyester and a preparation method thereof. The preparation method comprises the steps: subjecting terephthalic acid, butanediol, polyethylene glycol and a catalyst to reaction for 4-6 h under the vacuum conditions of 200-220 DEG C and 60-80 KPa so as to obtain a reactant A; reacting adipic acid, isophthalic acid, butanediol and a catalyst for 4-6 hours under the vacuum conditions of 160-180 DEG C and 60-80 KPa to obtain a reactant B; and reacting the reactant A and the reactant B at 230-245 DEG C under the vacuum condition of less than 100 Pa for 4-5 hours to obtain the copolyester. The copolyester can effectively solve the problem of poor temperature resistance of the existing copolyester.

Description

technical field [0001] The invention relates to the technical field of copolyester, in particular to a biodegradable copolyester with high melting point and a preparation method thereof. Background technique [0002] With the wide application and development of a large number of polymer materials, although these materials facilitate the material life of human beings, the waste after use (such as various packaging materials, films, etc.) cannot be decomposed naturally in the natural environment, resulting in serious The emergence of "white pollution". Biodegradable polyester materials are an effective way to solve "white pollution". Currently, the most widely used biodegradable polyester that has been commercialized is PBAT (polybutylene terephthalate / adipate). However, the melting point of PBAT is only 110-125°C, which severely restricts its application as a disposable plastic product that requires a higher temperature (80-100°C), such as disposable heat-resistant cups, st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/85
CPCC08G63/672C08G63/85
Inventor 兰建武林绍建
Owner SICHUAN UNIV
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