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A kind of polylactic acid chain extender and its preparation method and modified polylactic acid

A polylactic acid and chain extender technology, applied in the field of modified polylactic acid, can solve the problems of uneven molecular weight distribution, uneven dispersion, slow dispersion speed, etc., and achieve easy control of product quality, good compatibility, and maintain cleanliness. Effect

Active Publication Date: 2022-04-05
INST OF NEW MATERIALS & IND TECH WENZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion speed of the existing chain extenders in the polylactic acid matrix is ​​slow and uneven, resulting in uneven molecular weight distribution after chain extension

Method used

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  • A kind of polylactic acid chain extender and its preparation method and modified polylactic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) The formula of the polylactic acid chain extender is (by mass parts):

[0025] Polylactic acid (2003D, NatureWorks, USA): 100;

[0026] Glycidyl methacrylate: 10;

[0027] Antioxidant 1010: 0.2;

[0028] 2) Preparation process of polylactic acid chain extender

[0029] First dry the polylactic acid in a dryer at 80°C for 10 hours, then add the polylactic acid, glycidyl methacrylate and antioxidant 1010 into the high-speed mixer according to the above mass fractions and mix evenly. Extrude and granulate. Finally, the particle is irradiated with an absorbed dose of 20kGy electron beams to prepare the polylactic acid chain extender-glycidyl methacrylate grafted polylactic acid copolymer (PLA-g-GMA) of the present invention, and its preparation reaction schematic diagram is shown in the attached figure 1 .

Embodiment 2

[0031] 1) The formula of the polylactic acid chain extender is (by mass parts):

[0032] Polylactic acid (2003D, NatureWorks, USA): 100;

[0033] Glycidyl methacrylate: 1;

[0034] Antioxidant 1010: 0.1;

[0035] 2) Preparation process of polylactic acid chain extender

[0036] First dry the polylactic acid in a dryer at 80°C for 10 hours, then add the polylactic acid, glycidyl methacrylate and antioxidant 1010 into the high-speed mixer according to the above mass fractions and mix evenly. Extrude and granulate. Finally, the particles are irradiated with electron beams with an absorbed dose of 10 kGy to prepare the polylactic acid chain extender-glycidyl methacrylate grafted polylactic acid copolymer (PLA-g-GMA) of the present invention.

Embodiment 3

[0038] 1) The formula of the polylactic acid chain extender is (by mass parts):

[0039] Polylactic acid (2003D, NatureWorks, USA): 100;

[0040] Glycidyl methacrylate: 30;

[0041] Antioxidant 1010: 0.5;

[0042] 2) Preparation process of polylactic acid chain extender

[0043] First dry the polylactic acid in a dryer at 80°C for 10 hours, then add the polylactic acid, glycidyl methacrylate and antioxidant 1010 into the high-speed mixer according to the above mass fractions and mix evenly. Extrude and granulate. Finally, the particles are irradiated with electron beams with an absorbed dose of 30 kGy to prepare the polylactic acid chain extender-glycidyl methacrylate grafted polylactic acid copolymer (PLA-g-GMA) of the present invention.

[0044] performance test

[0045] The effect of chain extender on polylactic acid was compared by torque rheometer.

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Abstract

The invention relates to a polylactic acid chain extender, a preparation method thereof and modified polylactic acid. The structural formula of the polylactic acid chain extender involved in the present invention is the polylactic acid chain extender of the present invention, which has the technical effect of fast and uniform dispersion in the polylactic acid matrix.

Description

technical field [0001] The invention relates to a polylactic acid chain extender, a preparation method thereof and modified polylactic acid. Background technique [0002] Polylactic acid (PLA, Polylactic acid), as the most typical bio-based polymer material, is not only derived from renewable plant resources, but also can be biodegraded into non-toxic and harmless carbon dioxide and water under natural conditions. However, polylactic acid is a linear polyester with few branched chains and entanglement points in its molecular structure, low melt strength, and poor thermal processing performance and expandability. The methods to improve the melt strength of polylactic acid mainly include physical modification such as blending, nucleation, nanocomposite and fiber composite, and chemical modification such as copolymerization, branching, chain extension and crosslinking. Among them, chain extension is an effective method to improve the melt strength of PLA. However, the dispers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/02C08F220/32C08K5/134C08L67/04C08L51/08
CPCC08F283/02C08L67/04C08L51/08C08K5/1345
Inventor 黄承哲全承福王运萍
Owner INST OF NEW MATERIALS & IND TECH WENZHOU UNIV
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