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A kind of binary block aliphatic copolyester and preparation method thereof

A technology of block copolyester and polyethylene succinate copolyester, which is applied in the field of binary block aliphatic copolyester and its preparation, can solve the problem of failure to meet performance requirements, no commercial products, The problem of high price of sebacic acid, to achieve the effect of good toughness and high tensile strength

Active Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But neither of them has commercial products. On the one hand, it may be because of the high price of sebacic acid, and on the other hand, it may be related to its own performance that cannot meet the performance requirements for preparing a single product.

Method used

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  • A kind of binary block aliphatic copolyester and preparation method thereof
  • A kind of binary block aliphatic copolyester and preparation method thereof
  • A kind of binary block aliphatic copolyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add sebacic acid and ethylene glycol at a molar ratio of 1:1.3 to a three-necked bottle, then add 0.1 parts by weight (relative to 100 parts by weight of sebacic acid and ethylene glycol) of tetrabutyl titanate, and then Under a nitrogen atmosphere, the temperature was gradually raised to 180°C and reacted for 4 hours until no small molecular fractions were evaporated; then, the obtained reaction product was injected into a vacuum distillation device, and 0.07 parts by weight of neodymium isopropoxide (rare earth catalyst The weight ratio of the dosage to tetrabutyl titanate is 0.7), the temperature is raised to 220°C, and the vacuum degree of the system is gradually adjusted to less than 90Pa. After 10 hours of reaction, polyethylene sebacate (PESe) is obtained, the number average molecule The mass is 33,000 g / mol, and the molecular weight distribution is 2.3.

[0052] Add succinic acid and ethylene glycol at a molar ratio of 1:1.3 to a three-necked bottle, then add 0.1 p...

Embodiment 2

[0056] PESe, PES and PESe-b-PES were prepared according to the method of Example 1. The difference is that the molar ratio of prepolymer PESe and PES is 25 / 75. After testing, the product has a tensile strength of 28 MPa and elongation at break. It is 780%, and its biodegradability is 65% weight loss within 90 days according to GB / T20197-2006 composting standard.

Embodiment 3

[0058] PESe, PES, and PESe-b-PES were prepared according to the method of Example 1. The difference is that the molar ratio of prepolymer PESe and PES is 15 / 85. After testing, the product has a tensile strength of 30 MPa and elongation at break. The biodegradability is 670%. According to GB / T20197-2006 composting standard, the weight loss is 60% within 90 days.

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Abstract

The invention discloses a polyethylene glycol sebacate-b-polyethylene glycol succinate block copolyester, a preparation method and application thereof. The structural general formula of the copolyester provided by the invention is shown as the specification, wherein m is the polymerization degree of the polyethylene glycol sebacate structural unit, n is the polymerization degree of the polyethylene glycol succinate structural unit, m and n can be the same or different and are both positive integers greater than 5. The number-average molecular weight of the copolyester is 10000-100000g / mol, the molecular weight distribution index is 1.0-5.0, and is determined by a GPC method. According to the GB / T1040.2-2006 standard, the measured tensile strength is 28-36MPa, and the elongation at break is 600-1300%. The copolyester is biodegradable, and has good toughness and high tensile strength.

Description

Technical field [0001] The present invention relates to a biodegradable binary block aliphatic copolyester, specifically polyethylene sebacate-b-polyethylene succinate block copolyester (PESe-b-PES) and The preparation method. Background technique [0002] In recent years, in the face of serious environmental pollution and white waste, biodegradable materials have become a research hotspot. Among biodegradable materials, aliphatic polyesters are widely used in many fields due to their good biocompatibility and biodegradability, such as polylactic acid (PLA), polyhydroxybutyrate (PHB), polyethylene Commercial products such as lactones (PCL) and polybutylene succinate (PBS) have all come out. Among them, polyethylene succinate (PES) is a semi-crystalline aliphatic polyester with a glass transition temperature of about -10°C and a melting point of about 102°C. It is the higher melting point among aliphatic polyesters. A polymer, second only to polybutylene succinate (PBS), with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C08G63/16C08G63/78
Inventor 韩翎祝桂香张伟邹弋许宁计文希
Owner CHINA PETROLEUM & CHEM CORP