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Long chain branched polylactic acid grafted by free radicals of melt and preparation method thereof

A technology of branched polylactic acid and free radicals, which is applied in the field of melt free radical grafted long-chain branched polylactic acid and its preparation, can solve the problems of low crystallinity of linear polylactic acid, limiting the application of polylactic acid, and slow crystallization rate. Achieve short reaction time, shorten processing cycle, and improve physical properties

Inactive Publication Date: 2014-07-16
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low crystallinity, slow crystallization rate and low melt strength of linear polylactic acid, the industrial application of polylactic acid is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Dry the PLA at 50°C for 24 hours;

[0026] (2) Mix 80 parts of PLA after drying with 0.05 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, tris(2.4-di-tert-butyl-phenyl ) 0.05 parts of phosphite, 0.1 parts of DCP, 6 parts of PETA, added to a high-speed mixer with a rotation speed of 100r / min and stirred for 10 minutes to form a mixed material;

[0027] (3) Put the mixed material into the hopper of the twin-screw extruder, melt, extrude, pelletize, water cool, pelletize and dry the obtained product. Among them, the temperature and screw speed of each zone of the twin-screw extruder are respectively: the temperature of the first zone is 70°C, the temperature of the second zone is 120°C, the temperature of the third zone is 170°C, the temperature of the fourth zone is 170°C, the temperature of the fifth zone is 170°C, and the temperature of the sixth zone is 170°C. The head temperature is 170°C; the screw speed is 180r / min.

...

Embodiment 2

[0030] (1) Dry the PLA at 80°C for 28 hours;

[0031] (2) Mix 100 parts of PLA after drying with 0.25 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, tris(2.4-di-tert-butyl-phenyl ) 0.25 parts of phosphite, 0.5 parts of DCP and 10 parts of PETA, added to a high-speed mixer with a rotation speed of 100r / min and stirred for 12 minutes to form a mixed material;

[0032] (3) Put the mixed material into the hopper of the twin-screw extruder, melt, extrude, pelletize, water cool, pelletize and dry the obtained product. Among them, the temperature and screw speed of each zone of the twin-screw extruder are respectively: the temperature of the first zone is 100°C, the temperature of the second zone is 180°C, the temperature of the third zone is 230°C, the temperature of the fourth zone is 230°C, the temperature of the fifth zone is 230°C, the temperature of the sixth zone is 230°C, The head temperature is 200°C; the screw speed is 300r / min. ...

Embodiment 3

[0035] (1) Dry PLA at 65°C for 26 hours;

[0036] (2) Combine 90 parts of dried PLA with 0.15 parts of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, tris(2.4-di-tert-butylphenyl) ) 0.15 parts of phosphite, 0.3 parts of DCP and 8 parts of PETA, added to a high-speed mixer with a rotation speed of 100r / min and stirred for 11 minutes to form a mixed material;

[0037] (3) Put the mixed material into the hopper of the twin-screw extruder, melt, extrude, pelletize, water cool, pelletize and dry the obtained product. Among them, the temperature and screw speed of each zone of the twin-screw extruder are respectively: the temperature of the first zone is 90°C, the temperature of the second zone is 150°C, the temperature of the third zone is 200°C, the temperature of the fourth zone is 200°C, the temperature of the fifth zone is 200°C, and the temperature of the sixth zone is 200°C. The head temperature is 185°C; the screw speed is 240r / min.

[00...

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Abstract

The invention relates to long-chain-branched polylactic acid grafted by free radicals of melt and a preparation method thereof. The long-chain-branched polylactic acid is prepared by the following components in parts by weight: 80-100 parts of polylactic acid (PLA), 0.1-0.5 part of diisopropylamine peroxide (DCP), 6-10 parts of pentaerythritol triacrylate (PETA) and 0.1-0.5 part of antioxidant. The peroxide DCP and PETA are added into PLA, and the obtained PLA is subjected to free-radical reaction of the melt to generate long branch chains, so that the crystallization property of the material is improved and the physical property of the material is also improved. The method has the advantages that the reaction time is short, the processing period can be shortened and more convenience is brought for industrial production of the PLA material.

Description

technical field [0001] The invention relates to the technical field of biodegradable polymer materials, in particular to a melt free radical grafted long-chain branched polylactic acid and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a polymer obtained by polymerization of lactic acid as the main raw material. Its raw material source is sufficient and can be regenerated; moreover, the production process of polylactic acid is pollution-free, and the product can be biodegraded to realize the cycle in nature. Therefore, it is a kind of Important biodegradable green polymer materials. Although polylactic acid is suitable for various processing methods such as blow molding and thermoplastic, it is easy to process and widely used. It can be used to process various plastic products from industry to civilian use, packaged food, fast food lunch boxes, non-woven fabrics, industrial and civilian fabrics. However, due to the low crystallinity, s...

Claims

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Application Information

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IPC IPC(8): C08F283/02C08K5/134C08K5/526
Inventor 杨桂生刘凯
Owner HEFEI GENIUS NEW MATERIALS
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