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

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

CN109575196BActive Publication Date: 2022-04-05INST OF NEW MATERIALS & IND TECH WENZHOU UNIV +1
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  • A kind of polylactic acid chain extender and its preparation method and modified polylactic acid

Examples

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

Patent Timeline
05 Apr 2022
Publication
CN109575196B
IPC
C08F283/02; C08F220/32; C08K5/134; C08L67/04; C08L51/08
CPC
C08F283/02; C08L67/04; C08L51/08; C08K5/1345
Inventors
黄承哲; 全承福