Polylactic acid-based bio-based polyesteramide and preparation method thereof

A technology of polyester amide and polylactic acid, which is applied in the field of bio-based polyester amide based on polylactic acid and its preparation, can solve the problems of brittle performance, poor heat resistance and thermal stability, and achieve improved performance and good thermal stability. , the effect of expanding the scope of application

Active Publication Date: 2017-03-29
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid also has shortcomings such as brittle performance, poor heat resistance and thermal stability. Based on this, many research institutes at home and abroad are committed to the work of polylactic acid copolymerization modification. The patent publication number is CN 101100505A patent "a The preparation method of polylactic acid-polycarbonate copolymer ", the carboxyl-terminated lactic acid prepolymer is prepared by melting direct polycondensation method, and then copolymerized with aliphatic polycarbonate diol to obtain high molecular weight, toughness and Polylactic acid copolymer with good heat resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: 100 parts of polylactic acid prepolymer and 100 parts of polycaprolactam 6 prepolymer are fully mixed and placed in a reactor with a stirring device, and then 0.5 parts of SnCl are added 2 As a catalyst, nitrogen, vacuum, repeat the process of nitrogen and vacuum three times, replace the air in the reactor, vacuum control the pressure of the reaction system at -0.04 ~ -0.08MPa, first melt reaction at 145 ° C for 2 hours , and then heated up to 180°C for 5 hours of melt co-condensation to obtain a polyester amide copolymer. TGA analysis showed that the initial decomposition temperature and final decomposition temperature were 335.02°C and 429.61°C.

Embodiment 2

[0026] Example 2: 100 parts of polylactic acid prepolymer and 70 parts of polycaprolactam 66 prepolymer are fully mixed and evenly placed in a reactor with a stirring device, and then 1 part of SnCl is added 2 As a catalyst, nitrogen, vacuum, repeat the process of nitrogen and vacuum three times, replace the air in the reactor, vacuum control the pressure of the reaction system at -0.04 ~ -0.08MPa, first melt reaction at 145 ° C for 3 hours , and then heated up to 190°C for 3 hours to melt and copolymerize to obtain a polyester amide copolymer. TGA analysis showed that the initial decomposition temperature and final decomposition temperature were 303.97°C and 424.96°C.

Embodiment 3

[0027] Example 3: 100 parts of polylactic acid prepolymer and 50 parts of polycaprolactam 1010 prepolymer are fully mixed and evenly placed in a reactor with a stirring device, and then 3 parts of SnCl are added 2 As a catalyst, nitrogen, vacuum, repeat the process of nitrogen and vacuum three times, replace the air in the reactor, vacuum control the pressure of the reaction system at -0.04 ~ -0.08MPa, first melt reaction at 145 ° C for 1 hour , and then heated up to 170°C for 7 hours to melt and copolymerize to obtain a polyester amide copolymer. TGA analysis showed that the initial decomposition temperature and final decomposition temperature were 295.02°C and 410.92°C.

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Abstract

The invention relates to polylactic acid-based bio-based polyesteramide and a preparation method thereof. The preparation method comprises fully mixing 100 parts of a polylactic acid prepolymer and 10 to 100 parts of a polyamide prepolymer, putting the mixture into a reactor with a stirring device, then adding 0.5 to 5 parts of a catalyst into the reactor, feeding nitrogen gas into the reactor, carrying out vacuum-pumping, repeating the nitrogen feeding and vacuum-pumping processes 3 times so that air in the reactor is replaced and pressure in the reaction system is kept in a range of -0.04 to -0.08MPa through vacuum-pumping, carrying out a melting reaction process at a temperature of 120 to 150 DEG C for 1-3h, then heating the reaction product to 160 to 200 DEG C, and carrying out melting co-condensation for 3 to 7h to obtain the polyamide ester copolymer. The invention provides the simple and low-cost polyester amide preparation method. A polyamide chain segment is introduced into a polylactic acid chain segment by copolymerization modification so that the thermal stability of the polylactic acid is improved and an application range of polylactic acid in the field of film packaging is widened.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polylactic acid-based bio-based polyester amide and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a biodegradable polyester material with the advantages of wide sources, good biocompatibility and biodegradability. It has been used in medical fields such as surgical sutures, drug control carriers and tissue engineering materials. It has been widely used in green polymer materials and has become a class of green polymer materials with extremely broad application prospects. However, polylactic acid also has shortcomings such as brittle performance, poor heat resistance and thermal stability. Based on this, many research institutes at home and abroad are committed to the work of polylactic acid copolymerization modification. The patent publication number is CN 101100505A patent "a The preparation method of polylactic acid-polycarb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/44
CPCC08G69/44
Inventor 赵西坡彭少贤丁正
Owner HUBEI UNIV OF TECH
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