Polylactic acid-based foaming particles and preparation method thereof

An expanded particle, polylactic acid-based technology, applied in the field of plastic foam materials, can solve the problems of high cost and high price of PLA foam beads, unfavorable for the popularization and application of PLA, etc., and achieves low equipment requirements, high expansion ratio and environmental protection. friendly effect

Active Publication Date: 2021-06-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN109825046A discloses a biodegradable PLA foamed particle and its preparation method. The PLA foamed particle is prepared by a heating method and mainly uses dextrorotatory PLA as the matrix material However, the price of right-handed PLA is higher than that of left-handed PLA. The commercialized PLA on the market is mainly left-handed PLA, which is not conducive to the promotion and application of PLA, and the expansion ratio of the prepared PLA beads is 2.5-36.7. The prepared PLA The cost of foam beads is still high
However, the maximum expansion ratio of PLA foamed particles prepared by this method is only about 30 times.

Method used

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  • Polylactic acid-based foaming particles and preparation method thereof
  • Polylactic acid-based foaming particles and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The semi-crystalline PLA was added to a twin-screw extruder to extrude and granulate, and the diameter of PLA pellets was 1.0mm. The prepared PLA particles were put into an autoclave, and the pressure was 5MPa of CO 2 , Make the PLA particles reach saturation, the saturation temperature is 25°C, the saturation time is 16h, release the pressure, and take out the saturated PLA particles. The saturated PLA particles have a gas solubility of 18 (gCO 2 / kg PLA), crystallinity is 15%, puts into the oven of 80 ℃ and expands for 30s, obtains PLA primary expanded particle, and crystallinity is 25%, and expansion ratio is 23.

[0064] Put the prepared PLA primary foamed particles into an autoclave, and feed CO with a pressure of 4.0MPa. 2 , the saturation temperature is 25°C, the saturation time is 8h, the pressure is released, and the saturated primary foamed PLA particles are taken out. The saturated PLA primary foam particles have a gas solubility of about 20 (gCO 2 / kg pr...

Embodiment 2

[0066] In this example, except that the pressure of secondary saturation is 6MPa, the saturation time is 4h, and the gas solubility after secondary saturation is about 20 (gCO 2 / kg primary expanded particle), crystallinity is about 30%, and foaming temperature is 120 ℃, and other conditions are the same as embodiment 1, and the PLA secondary expanded particle of preparation, expansion ratio is 41.

Embodiment 3

[0068] Mix the semi-crystalline PLA and nano-silica in a high-speed mixer, and then add them to a twin-screw extruder to extrude and granulate. In this embodiment, except that the particles are PLA / nano-silicon dioxide composite material, the amount of nano-silicon dioxide added is 0.5 wt%. Other conditions are with embodiment 1, and the PLA / nano silicon dioxide particle after primary saturation, its gas solubility is about 16 (gCO 2 / kg PLA / nano silicon dioxide particles), the crystallinity is about 18%, the particle after primary foaming, the crystallinity is about 28%, and the expansion ratio is 30. The gas solubility after secondary saturation is about 20(gCO 2 / kg primary expanded particle), crystallinity is about 29%, obtains secondary expanded particle, and expansion ratio is 45.

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Abstract

The invention discloses a preparation method of polylactic acid-based foaming particles, which comprises the following steps of (1) foaming fluid-saturated polylactic acid-based particles to obtain primary foaming particles, (2) performing fluid saturation on the primary foaming particles in the step (1) to obtain saturated primary foaming particles, and (3) foaming the saturated primary foaming particles in the step (2) to obtain the polylactic acid-based foaming particles. The invention also provides a polylactic acid-based foaming particle. The preparation method provided by the invention is mild in reaction condition and environment-friendly, and the prepared PLA foamed beads are high in expansion rate and uniform in cell size distribution.

Description

technical field [0001] The present application relates to a polylactic acid-based foamed particle and a preparation method thereof, more specifically, to a preparation method of a polylactic acid-based foamed particle with a high expansion ratio, and belongs to the field of plastic foamed materials. Background technique [0002] Polylactic acid (PLA) has two advantages of "plant origin" and "complete biodegradability". It is a linear aliphatic thermoplastic polyester obtained by polymerization with lactic acid as the main raw material. The source of lactic acid is sufficient and can be regenerated. It is an ideal green polymer material. However, polylactic acid has poor toughness, slow crystallization rate, long molding cycle, increased energy consumption, increased production cost, low melt strength, sensitive melt viscosity with temperature changes, and narrow processing window, which restrict the application and development of PLA. . The preparation of PLA into foamed m...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L55/02C08L69/00C08K3/36C08J9/18C08J9/12
CPCC08J9/18C08J9/122C08J2367/04C08J2455/02C08J2469/00C08K2201/011C08K3/36C08J2203/06C08J9/0061C08J9/0071
Inventor 任倩郑文革吴飞罗海斌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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