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Heteroatom-containing high-barrier biodegradable copolyester and preparation method and application thereof

A biodegradable, high-barrier technology, applied in the direction of single-component copolyester artificial filaments, etc., can solve the problems of no degradation performance, poor water vapor barrier property, and large environmental hazards, and achieve good biodegradability and degradation rate Accelerates and blocks the effect with remarkable effect

Active Publication Date: 2021-02-19
RACHEM CHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Food preservation packaging to material O 2 Transmittance and CO 2 The transmittance is required. Plastic packaging has a certain gas barrier property, so that the environmental gas composition in the packaging can reach a state of low oxygen and high carbon dioxide due to the respiration of vegetables, inhibit the respiration, and slow down the aging and deterioration of vegetables, so as to achieve The purpose of freshness preservation; cosmetics, pesticides, and beverage bottles have higher requirements for gas transmission rate, and the oxygen barrier property of PET is poor, which is generally enhanced by coating treatment; the field of agricultural film also puts forward requirements for the water retention of materials, traditional The water vapor transmission rate of polyolefin agricultural film is low, but the environmental pollution is huge. Most of the biodegradable agricultural films are made of polylactic acid and PBAT, and the water vapor barrier is poor.
[0003] At present, the commonly used barrier materials in the market mainly include aluminum foil, aluminized foil film, ethylene-vinyl alcohol copolymer EVOH, polyvinylidene chloride PVDC, polyethylene naphthalate PEN or inorganic coating (AlOx, SiOx, etc.) film etc. These materials are often difficult to recycle at the later stage of use, difficult to degrade in nature, and cause great environmental hazards
Biodegradable materials can be completely degraded into CO in nature 2 、H 2 O and biomass meet the requirements of global sustainable development, but biodegradable plastics such as PLA and PBAT have poor barrier properties, especially for water vapor
Chinese invention patent document CN201911017813.0 discloses a new type of thiophenedicarboxylic acid-based copolyester and its preparation method and application. The obtained Polyester has high barrier properties but no degradation properties

Method used

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  • Heteroatom-containing high-barrier biodegradable copolyester and preparation method and application thereof
  • Heteroatom-containing high-barrier biodegradable copolyester and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]0.7mol thiophenedicarboxylic acid, 0.3mol adipic acid, 1mol butanediol, 0.4mol 2,2'-thiodiglycol, 0.1mol 2-ethyl-2-butyl-propanediol, 0.15mmol n-butyl titanate The ester was added into the reaction kettle under nitrogen protection, the temperature was raised to 220°C with stirring, and the reaction was carried out for 4 hours. Then the temperature was raised to 230° C., pre-condensed under low vacuum for 1 hour, and then 0.2 mmol of n-butyl titanate was added. The temperature was raised to 245° C., the vacuum was gradually evacuated to 50 Pa, and the polycondensation was carried out for 3 hours to obtain the product. The intrinsic viscosity of product is 1.32dL / g, and terminal carboxyl group is 24mol / t, and the breaking strength of sample after processing is 29MPa, and elongation at break is 480%, and the water vapor transmission rate of the prepared thickness 25 μm film is 80g / ( m 2 day), the oxygen transmission rate is 35mL / (m 2 ·day·atm), the degradation rate of th...

Embodiment 2

[0037] 0.3mol thiophenedicarboxylic acid, 0.7mol sebacic acid, 0.1mol butanediol, 0.5mol 2,2'-thiodiglycol, 0.9mol 2-ethyl-2-butyl-propanediol, 0.15mmol titanate Butyl ester was added into the reaction kettle, under nitrogen protection, the temperature was raised to 210°C with stirring, and the reaction was carried out for 3 hours. Then the temperature was raised to 230° C., pre-condensed under low vacuum for 1 hour, and then 0.2 mmol of n-butyl titanate was added. The temperature was raised to 245° C., the vacuum was gradually evacuated to 50 Pa, and the polycondensation was carried out for 3 hours to obtain the product. The intrinsic viscosity of product is 1.28dL / g, and terminal carboxyl group is 15mol / t, and the breaking strength of sample after processing is 18MPa, and elongation at break is 680%, and the water vapor transmission rate of the thickness 25 μm film of preparation is 70g / ( m 2 ·day), the oxygen transmission rate is 25mL / (m 2 ·day·atm), the degradation rate...

Embodiment 3

[0039] Add 1 mol of succinic acid, 0.8 mol of butanediol, 0.2 mol of 2,2'-thiodiglycol, 0.5 mol of 2-ethyl-2-butyl-propylene glycol, and 0.15 mmol of n-butyl titanate into the reaction kettle, Under nitrogen protection, the temperature was raised to 190° C. with stirring, and the reaction was carried out for 3 hours. Then the temperature was raised to 230° C., pre-condensed under low vacuum for 1 hour, and then 0.2 mmol of n-butyl titanate was added. The temperature was raised to 245° C., the vacuum was gradually evacuated to 50 Pa, and the polycondensation was carried out for 3 hours to obtain the product. The intrinsic viscosity of product is 1.21dL / g, and terminal carboxyl group is 18mol / t, and the breaking strength of sample after processing is 17MPa, and elongation at break is 760%, and the water vapor transmission rate of the thickness 25 μm film of preparation is 91g / ( m 2 ·day), the oxygen transmission rate is 45mL / (m 2 ·day·atm), the degradation rate of the polymer...

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Abstract

The invention discloses a heteroatom-containing high-barrier biodegradable copolyester and a preparation method and application thereof. The copolyester is mainly prepared by esterification and polycondensation of aliphatic diol and aliphatic dibasic acid, in the polyester synthesis process, aromatic dibasic acid, 2, 2 '-thiodiethylene glycol and a monomer 2-ethyl-2-butyl-propylene glycol containing a side chain group are introduced into a molecular chain of the polyester, the barrier property of the polymer is improved by utilizing the polarity of heteroatoms and the steric hindrance of the side chain group, meanwhile, the hydrophilic property of the copolyester is improved by introducing sulfur atoms; the obtained copolyester has excellent mechanical properties, high barrier property andbiodegradability, and can be widely applied to the fields of food preservation, agricultural film water retention, barrier bottles, textile fibers and the like.

Description

technical field [0001] The invention relates to the field of functional polymer materials, in particular to a biodegradable copolyester with high barrier and its preparation method and application. Background technique [0002] Barrier materials play an important role in packaging, agricultural film and other fields, providing protection and prolonging shelf life for food, medicine, cosmetics, pesticides and other commodities. Different application fields have different barrier requirements for materials. Food preservation packaging to material O 2 Transmittance and CO 2 The transmittance is required. Plastic packaging has a certain gas barrier property, so that the environmental gas composition in the packaging can reach a state of low oxygen and high carbon dioxide due to the respiration of vegetables, inhibit the respiration, and slow down the aging and deterioration of vegetables, so as to achieve The purpose of freshness preservation; cosmetics, pesticides, and bevera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/688C08J5/18C08L67/02D01F6/84
CPCC08G63/6886C08J5/18D01F6/84C08J2367/02Y02W90/10
Inventor 吴开建侯远杨寇雪晨董栋张宁
Owner RACHEM CHINA CO LTD
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