A kind of 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 the content and simplifying the synthesis process

Active Publication Date: 2022-07-05
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • 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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  • A kind of preparation method of degradable polytrimethylene terephthalate copolyester
  • A kind of preparation method of degradable polytrimethylene terephthalate copolyester
  • A kind of preparation method of degradable polytrimethylene terephthalate copolyester

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[0035] General embodiment: a preparation method of degradable polytrimethylene terephthalate copolyester, comprising the following preparation steps: (1) preparation of low molecular weight polyglycolic acid: placing glycolic acid and a catalyst in a reaction kettle, The reaction is carried out at 150-200 ° C for 3-6 hours, and the low molecular weight polyglycolic acid with a molecular weight of 6000-9000 is prepared by polymerization, and the mass ratio of the glycolic acid and the catalyst is 2000-3000:1;

[0036] (2) Preparation of esterification solution: terephthalic acid and propylene glycol are placed in a reaction kettle for esterification at 220-235° C. and 0.1-0.3Mpa for 1-2.5h, and it is finished when the esterification rate reaches more than 85%, The esterification solution is prepared, and the molar ratio of terephthalic acid and propylene glycol is 1:1.4-1.8;

[0037] (3) adding low molecular weight polyglycolic acid to the esterification solution, then adding c...

Embodiment 1

[0044] Embodiment 1: a preparation method of degradable polytrimethylene terephthalate copolyester, comprising the following preparation steps:

[0045] (1) Preparation of low molecular weight polyglycolic acid: put glycolic acid and tetrabutyl titanate in a reactor, 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 the 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 0.2Mpa for 2h, and finish when the esterification rate reaches more than 85%, and prepare an esterification solution. The molar ratio of terephthalic acid and propylene glycol is 1:1.4;

[0047] (3) low-molecular-weight polyglycolic acid is added to the esterification solution, the addition amount is 30% of the total mass of the copolyester, and the composite catalyst (n-te...

Embodiment 2

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

[0053] (1) Preparation of low molecular weight polyglycolic acid: put glycolic acid and tetrabutyl titanate in a reaction kettle, 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 the 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 h, and finish when the esterification rate reaches more than 85% to prepare an esterification solution. The molar ratio of terephthalic acid and propylene glycol is 1:1.4;

[0055] (3) low-molecular-weight polyglycolic acid is added to the esterification solution, the addition amount is 10% of the total mass of the copolyester, and the composite cata...

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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, comprising the following preparation steps: (1) preparation of low molecular weight polyglycolic acid: (2) Preparation of esterification liquid: terephthalic acid and propylene glycol are placed in the reaction kettle to carry out esterification reaction, and the esterification liquid is prepared; ( 3) Add low molecular weight polyglycolic acid into the esterification solution, then add composite catalyst and stabilizer, and carry out pre-polycondensation and final polycondensation reactions to prepare degradable polytrimethylene terephthalate copolyester; The low molecular weight polyglycolic acid obtained from the glycolic acid monomer and then copolymerized can effectively control the molecular structure and adjust the degradation performance of the polyglycolic acid according to the proportion of the low molecular weight polyglycolic acid added.

Description

technical field [0001] The invention relates to the field of preparation of degradable copolyester, in particular to a preparation method of degradable polytrimethylene terephthalate copolyester. Background technique [0002] Poly-1,3-propylene terephthalate (PTT) is a polymer obtained by esterification, pre-polycondensation and final condensation of terephthalic acid (PTA) and 1,3-propylene glycol (PDO). With the gradual maturity of 1,3-propanediol preparation technology, it is possible to prepare PTT on a large scale. PTT, PET and PBT belong to the same aromatic series of organic polyester polymers. Due to the odd number of methylene groups in PTT, the molecular chain is arranged in a Z-shaped helix, which makes PTT highly contractile. At the same time, compared with PET, PTT has the advantages of low fiber modulus and good bending performance, and is very suitable for use in fiber filling materials and elastic carpets and other fields. However, PTT does not have the fu...

Claims

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Application Information

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Patent Type & Authority Patents(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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