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Polyester with high molecular weight and weak crystallinity and its preparation method and application

A high-molecular-weight and crystalline technology, applied in polyester and its preparation, high-molecular-weight and weakly crystalline polyester and its preparation field, can solve the problems of low molecular weight and poor mechanical properties of homopolyester, and achieve weak crystallinity, The effect of good flexibility and high elongation at break

Active Publication Date: 2019-06-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of low molecular weight and poor mechanical properties of homopolyesters based on 1,5-pentanediol in the prior art, the purpose of the present invention is to provide a polyester with high molecular weight and weak crystallinity and a preparation method thereof. Polyester has high molecular weight, excellent mechanical properties such as good flexibility and high strength, and good thermal stability so it has excellent processing properties

Method used

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  • Polyester with high molecular weight and weak crystallinity and its preparation method and application
  • Polyester with high molecular weight and weak crystallinity and its preparation method and application
  • Polyester with high molecular weight and weak crystallinity and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Add isophthalic acid (0.375mol, 58.53g), 1,5-pentanediol (1.0mol, 104.15g) and titanium dioxide-silica-polyvinylpyrrolidone composite catalyst (1.5 mmol, 114 mg), with an alkyd ratio of 2.7, reacted at 200°C for 1 hour, 220°C for 1 hour, and 230°C for 1 hour to obtain an esterified product with an esterification rate of 98.9%;

[0045] (2) No further catalyst is added to the esterification product obtained in step (1). Under the condition of about 120Pa, the reaction is carried out at 230°C for 1 hour, at 240°C for 1 hour, at 250°C for 1 hour, and at 260°C for 0.5 hour, remove excess 1,5-pentanediol and a small amount of oligomers to obtain polypentylene isophthalate, abbreviated as PPeI, and its H NMR spectrum is as follows figure 1 shown.

[0046] After testing, the intrinsic viscosity of PPeI prepared in this example is 0.81dL / g, the glass transition temperature is -13.5°C, and there is no obvious melting and crystallization peak and melting point; the tensile m...

Embodiment 2

[0048] (1) Add 2,5-furandicarboxylic acid (0.375mol, 58.53g), 1,5-pentanediol (0.75mol, 78.11g) and n-butyl titanate (0.375mmol, 128mg) into a 250mL four-necked flask ), with an alkyd ratio of 2, reacted at 200°C for 1 hour, at 220°C for 1 hour, and at 230°C for 1.5 hours to obtain an esterified product with an esterification rate of 98.9%;

[0049] (2) Add isopropyl titanate (0.375mmol, 106mg) to the esterification product obtained in step (1), and react at 230°C for 1 hour at about 140Pa, 1 hour at 240°C, and 250°C React for 1 hour at 260°C for 1 hour to remove excess 1,5-pentanediol and a small amount of oligomers to obtain polypentylene-2,5-furandicarboxylate, abbreviated as PPeF.

[0050] After testing, the intrinsic viscosity of PPeF prepared in this example is 0.84dL / g, the glass transition temperature is 21.9°C, and there is no obvious melting and crystallization peak and melting point; the tensile modulus is 4.2MPa, the tensile strength is 11.2MPa, and the elongation ...

Embodiment 3

[0052] (1) Add terephthalic acid (0.5mol, 78.04g), xylitol (5mmol, 0.761g), 1,5-pentanediol (0.75mol, 78.11g) and titanium- Phosphorus composite catalyst (306mg, Nanjing Nengde New Material Technology Co., Ltd., TCAIA10), with an alkyd ratio of 1.5, was reacted at 200°C for 1 hour, at 220°C for 1 hour, and at 230°C for 3 hours to obtain an esterification product, The esterification rate reaches 97.0%;

[0053] (2) No further catalyst is added to the esterification product obtained in step (1). Under the condition of about 120 Pa, the reaction is carried out at 230° C. for 1 hour, at 240° C. for 1 hour, at 250° C. for 1.5 hours, and at 260° C. for 1 hour. Hours, remove excess 1,5-pentanediol and a small amount of oligomers to obtain xylitol-branched polypentylene terephthalate, abbreviated as PPeT-b.

[0054] After testing, the intrinsic viscosity of PPeT-b prepared in this example is 0.78dL / g, the glass transition temperature is 13.5°C, the melting crystallization peak temper...

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Abstract

The invention discloses polyester with high molecular weight and weak crystallinity as well as a preparation method and application of the polyester. The polyester is prepared by an esterifying-melting phase polycondensation process of bio-based 1,5-propandiol, binary acid and a selectively-added branched monomer. The carbon atomic number of a dihydric alcohol chain segment in the polyester with the high molecular weight and the weak crystallinity is odd number, and the crystallization property is weak, so that the polyester has excellent mechanical properties and a broad application prospect. The preparation method provided by the invention is simple in process; no solvent needs to be used, so that the process is environmentally friendly; the polyester has the advantages of high catalyst activity, short reaction time, good color and luster of the product, and facilitates the realization of industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and their preparation, and relates to polyesters and their preparation methods, in particular to high-molecular-weight weakly crystalline polyesters, their preparation methods and applications. Background technique [0002] Weakly crystalline polyester has the characteristics of transparency and good flexibility, and is suitable for applications that require high transparency and toughness of the material. Traditional polyesters usually use diols with an even number of carbons, such as ethylene glycol and 1,4-butanediol. Compared with these diols, 1,5-pentanediol has an odd number of carbon atoms and a molecular chain Longer length makes the 1,5-pentanediol polyester molecular chain more flexible, and for 1,5-pentanediol polyester with aliphatic or aromatic ring molecular structure, its crystallinity will also be weak The 1,5-pentanediol polyester will have different physical and mechan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/181C08G63/58C08G63/20C08G63/85C08L67/02C08L67/06
CPCC08G63/181C08G63/20C08G63/58C08G63/85C08L67/02C08L67/06
Inventor 吴林波陆璟
Owner ZHEJIANG UNIV
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