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Preparation method of degradable polytrimethylene terephthalate copolyester

A polytrimethylene terephthalate copolyester and terephthalic acid technology, which is applied in the field of degradable copolyester preparation, can solve the problems of white pollution, no biodegradation function, unfavorable environmental sustainable development, and the like, To achieve the effect of reducing content and simple synthesis process

Active Publication Date: 2020-07-10
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to overcome the problems that the PTT prepared in the prior art has no biodegradation function, a large amount of use will cause white pollution, and is not conducive to the sustainable development of the environment, etc., and proposes a degradable poly terephthalic acid The preparation method of propylene glycol ester copolyester

Method used

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  • Preparation method of degradable polytrimethylene terephthalate copolyester
  • Preparation method of degradable polytrimethylene terephthalate copolyester
  • Preparation method of degradable polytrimethylene terephthalate copolyester

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preparation example Construction

[0035] General embodiment: a kind of preparation method of degradable poly(trimethylene terephthalate) copolyester comprises following preparation steps: (1) preparation of low molecular weight polyglycolic acid: glycolic acid and catalyst are placed in reactor, in React at 150-200°C for 3-6 hours, and polymerize to obtain low-molecular-weight polyglycolic acid with a molecular weight of 6000-9000, and the mass ratio of glycolic acid to catalyst is 2000-3000:1;

[0036] (2) Preparation of esterification solution: put terephthalic acid and propylene glycol in a reaction kettle to perform esterification at 220-235°C and 0.1-0.3Mpa for 1-2.5h, and end when the esterification rate reaches above 85%. Prepare esterification liquid, the molar ratio of terephthalic acid and propylene glycol is 1:1.4-1.8;

[0037] (3) Add low-molecular-weight polyglycolic acid to the esterification solution, then add composite catalyst and trimethyl phosphate, and react at 250-260°C and 0.1-0.3Mpa for ...

Embodiment 1

[0044] Embodiment 1: a kind of preparation method of degradable polytrimethylene terephthalate copolyester comprises following preparation steps:

[0045] (1) Preparation of low-molecular-weight polyglycolic acid: place glycolic acid and tetrabutyl titanate in a reaction kettle, react at 170°C for 4 hours, and polymerize to obtain low-molecular-weight polyglycolic acid with a molecular weight of 8000, wherein glycolic acid and The mass ratio of catalyst is 2500:1;

[0046] (2) Preparation of esterification solution: place terephthalic acid and propylene glycol in a reaction kettle for esterification at 225° C. and 0.2 Mpa for 2 hours, and end when the esterification rate reaches more than 85%, and prepare esterification solution. The mol ratio of said terephthalic acid and propylene glycol is 1:1.4;

[0047] (3) Low-molecular-weight polyglycolic acid is added to the esterification solution, and the addition is 30% of the total mass of copolyester, and then the composite catal...

Embodiment 2

[0052] Embodiment 2: a kind of preparation method of degradable polytrimethylene terephthalate copolyester comprises the following preparation steps:

[0053] (1) Preparation of low-molecular-weight polyglycolic acid: place glycolic acid and tetrabutyl titanate in a reactor, react at 200°C for 6 hours, and polymerize to obtain low-molecular-weight polyglycolic acid with a molecular weight of 9000, wherein glycolic acid and The mass ratio of catalyst is 2000:1;

[0054] (2) Preparation of esterification solution: place terephthalic acid and propylene glycol in a reaction kettle for esterification at 220° C. and 0.1 Mpa for 1 hour, and end when the esterification rate reaches above 85%, and prepare esterification solution. The mol ratio of said terephthalic acid and propylene glycol is 1:1.4;

[0055] (3) Low-molecular-weight polyglycolic acid is added to the esterification liquid, and the addition is 10% of the total mass of copolyester, and then the composite catalyst (n-tetr...

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Abstract

The invention discloses a preparation method of degradable polytrimethylene terephthalate copolyester, and relates to the field of preparation of degradable copolyester. The preparation method comprises the following steps: (1) preparation of low-molecular-weight polyglycolic acid: putting glycolic acid and a catalyst into a reaction kettle, and polymerizing to obtain the low-molecular-weight polyglycolic acid; (2) preparation of esterification liquid: putting terephthalic acid and propylene glycol into a reaction kettle for esterification reaction to prepare the esterification liquid; (3) adding low-molecular-weight polyglycolic acid into the esterification liquid, then adding a composite catalyst and a stabilizer, and carrying out pre-polycondensation and final polycondensation to prepare degradable polytrimethylene terephthalate copolyester. Low-molecular-weight polyglycolic acid is prepared from glycolic acid monomers and then copolymerized, the molecular structure can be effectively controlled, and the degradation performance of polyglycolic acid is adjusted according to the proportion of the addition amount of low-molecular-weight polyglycolic acid.

Description

technical field [0001] The invention relates to the field of preparation of degradable copolyester, in particular to a preparation method of degradable poly(trimethylene terephthalate) copolyester. Background technique [0002] Poly(1,3-trimethylene terephthalate) (PTT) is a polymer made from terephthalic acid (PTA) and 1,3-propanediol (PDO) through esterification, precondensation, and final shrinkage. With the gradual maturity of the preparation technology of 1,3-propanediol, it is possible to prepare PTT on a large scale. PTT, PET, and PBT all belong to the same aromatic series of organic polyester polymers. Because PTT has an odd number of methylene groups, the molecular chains are arranged in a Z-shaped helix, which makes PTT highly shrinkable. At the same time, compared with PET, PTT has the advantages of low fiber modulus and good bending performance, so it is very suitable for fiber filling materials and elastic carpets and other fields. However, PTT does not have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/85
CPCC08G63/60C08G63/85
Inventor 刘园园董海良王晶晶王文
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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