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Polylactic acid with high crystallization property and preparation method thereof

A technology of polylactic acid and high crystallization, which is applied in the field of biodegradable polymer materials, can solve the problems of polylactic acid molecular regularity damage, product crystallization performance reduction, and difficulty in application and promotion, so as to improve physical properties, crystallization properties, The effect of improving mobility

Active Publication Date: 2014-10-08
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of introducing long-chain branched structure into the polylactic acid system is mainly obtained through the solution or melt chain extension reaction of the lactic acid prepolymer, and the reaction time is long; and the existence of the branched-chain structure leads to the destruction of the regularity of the polylactic acid molecule. Reduce the crystallization performance of the product, making it difficult to apply and promote in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 80 parts of polylactic acid (PLA), 0.1 part of dicumyl peroxide (DCP), 4 parts of pentaerythritol triacrylate (PETA), 1 part of dibutyl sebacate (DBS), polyethylene glycol Alcohol (PEG) 16 parts, Irganox1010 0.05 part, Irganox1330 0.05 part.

[0033] (2) Dry the weighed PLA at 50°C for 24 hours; stir the dried PLA, antioxidant, and DCP through a high-speed mixer for 10 minutes to form a mixed material;

[0034] (3) Put polyethylene glycol into a three-necked flask, heat until the polyethylene glycol melts, then add DBS under the protection of nitrogen, continue heating to 230°C at a stirring rate of 200rpm, and keep for a period of time until all DBS was dissolved in polyethylene glycol. The samples were naturally cooled to room temperature, and dried in a vacuum oven at 110°C for 36 hours for later use.

[0035] (4) Put the mixed material into the hopper of the twin-screw extruder, add PETA and gel nucleating agent from the third zone and the fourth zone re...

Embodiment 2

[0038] (1) Weigh 100 parts of polylactic acid (PLA), 0.5 parts of dicumyl peroxide (DCP), 10 parts of pentaerythritol triacrylate (PETA), 5 parts of dibutyl sebacate (DBS), polyethylene glycol Alcohol (PEG) 20 parts, Irganox1010 0.25 parts, Irganox1330 0.25 parts.

[0039] (2) Dry the weighed PLA at 50°C for 24 hours; mix the dried PLA, antioxidant, and DCP with a high-speed mixer for 12 minutes to form a mixed material;

[0040] (3) Put polyethylene glycol into a three-necked flask, heat until the polyethylene glycol melts, then add DBS under the protection of nitrogen, continue heating to 230°C at a stirring rate of 200rpm, and keep for a period of time until all DBS was dissolved in polyethylene glycol. The samples were naturally cooled to room temperature, and dried in a vacuum oven at 110°C for 36 hours for later use.

[0041] (4) Put the mixed material into the hopper of the twin-screw extruder, add PETA and gel nucleating agent from the third zone and the fourth zone ...

Embodiment 3

[0044] (1) Weigh 85 parts of polylactic acid (PLA), 0.3 parts of dicumyl peroxide (DCP), 7 parts of pentaerythritol triacrylate (PETA), 3 parts of dibutyl sebacate (DBS), polyethylene glycol Alcohol (PEG) 18 parts, Irganox1010 0.15 parts, Irganox1330 0.15 parts.

[0045] (2) Dry the weighed PLA at 50°C for 24 hours; mix the dried PLA, antioxidant, and DCP with a high-speed mixer for 11 minutes to form a mixed material;

[0046] (3) Put polyethylene glycol into a three-necked flask, heat until the polyethylene glycol melts, then add DBS under the protection of nitrogen, continue heating to 230°C at a stirring rate of 200rpm, and keep for a period of time until all DBS was dissolved in polyethylene glycol. The samples were naturally cooled to room temperature, and dried in a vacuum oven at 110°C for 36 hours for later use.

[0047] (4) Put the mixed material into the hopper of the twin-screw extruder, add PETA and gel nucleating agent from the third zone and the fourth zone re...

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Abstract

The invention relates to polylactic acid with high crystallization property. The polylactic acid is prepared from the following components in parts by weight: 80-90 parts of PLA (Polylactic Acid) 1-5 parts of DBS, 16-20 parts of PEG (Polyethylene Glycol) 0.1-0.5 part of DCP (Dibasic Calcium Phosphate), 4-10 parts of PETA and 0.1-0.5 part of antioxidant. The preparation method of the polylactic acid with high crystallization property comprises the following steps: drying PLA, mixing with a prepared gel core forming agent, DCP, PETA and antioxidant, performing extrusion pelletizing, cooling in water, cutting into grains, drying and the like, thereby obtaining a product. The preparation method innovatively adopts a mode of melting and commixing the physical gel core forming agent and the polylactic acid, the crystallization property of a material is improved, not only are physical properties of the material improved, but also the application range of the material is widened, and great practical significance is achieved. A PLA modified material prepared by using the preparation method is excellent in property and can be commixed with other engineering plastic separately to prepare engineering structural components.

Description

technical field [0001] The invention relates to the technical field of biodegradable polymer materials, in particular to a method for preparing polylactic acid with high crystallinity by melting and blending a physical gel nucleating agent and long-chain branched polylactic acid. The PLA modified material prepared by this method has excellent properties and can be used alone or blended with other engineering plastics to prepare engineering structural parts. Background technique [0002] Polylactic acid is an important biodegradable polyester polymer, but because of the low crystallinity, slow crystallization rate and low melt strength of linear polylactic acid, the industrial application of polylactic acid is limited. Many studies have shown that a very important factor affecting the melt strength is the branched structure of the polymer. Therefore, introducing long chain branches into the main chain of PLA is a very effective way to improve its melt strength. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08K5/11C08L71/08C08L51/08B29C47/92B29C48/92
CPCB29B9/02B29B9/12B29C47/8895B29B7/46B29B9/06B29C47/0011B29C47/92B29B7/72B29C48/04B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92895
Inventor 杨桂生刘凯
Owner HEFEI GENIUS NEW MATERIALS