Preparation method of biodegradable polymer foamed particles

A technology for degrading polymers and foamed particles, which is applied in the field of preparation of biodegradable polylactic acid or polylactic acid composite foamed particles, which can solve the problems of slow gaseous diffusion rate, long production cycle, and poor foaming effect , to achieve short saturation time, easy operation, and beneficial to industrial implementation

Active Publication Date: 2011-07-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the low-pressure gaseous CO 2 The gaseous diffusion rate in PLA is very slow, and the saturation process generally requires as long as 16h or longer, ...

Method used

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  • Preparation method of biodegradable polymer foamed particles
  • Preparation method of biodegradable polymer foamed particles
  • Preparation method of biodegradable polymer foamed particles

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The semi-crystalline PLA (product of NaureWorks, the weight percentage of D-type lactic acid monomer in PLA resin is 4.2%) is added to the twin-screw extruder, and the PLA melt is transferred to the extruder through twin-screw extrusion. Die mouth, granulation after water cooling. The chosen die had 12 holes, each with a diameter of 0.6 mm, resulting in PLA microparticles having a diameter of 0.6 mm.

[0036] The prepared PLA microparticles were put into an autoclave, and CO with a pressure of 5MPa was introduced. 2 The high-pressure fluid makes the PLA microparticles saturated, the saturation temperature is 40 °C, and the saturation time is 10 h to obtain saturated polylactic acid microparticles.

[0037] Open the air valve at the upper part of the autoclave to release high-pressure gas, open the discharge valve at the lower part of the autoclave, and pass the saturated polylactic acid microparticles into a hot air foaming box with a temperature of 110 ° C for 30s to ...

Embodiment 2

[0040] Except for CO at a pressure of 5MPa 2 Mix high-pressure fluid with pentane (the volume content of pentane is 0.1%), except that the saturation time is 2h, other operations are the same as those in Example 1, to obtain polylactic acid foamed particles.

[0041] The prepared PLA expanded particles have a smooth appearance structure. Scanning electron microscope analysis of the quenched section of the PLA expanded particle sample showed that the cell density of the PLA expanded particle sample was 3.6×10 5 cells / cm 3 , the expansion ratio is 38.

Embodiment 3

[0043] Except that the polymer is a blend of PLA and PBS, the weight percentage of PBS in the blend is 10%, and the saturation time is 5h, other operations are the same as those in Example 1, to prepare polylactic acid composite foamed particles.

[0044] The prepared PLA composite expanded particles have a smooth appearance structure. Scanning electron microscopy analysis of the quenched section of the PLA composite expanded particle sample, such as figure 2 , showing that the cell structures of the PLA composite expanded particles are all closed cells, which indicates that the introduction of PBS inhibits the opening phenomenon of the PLA micro-foaming process. The cell density of PLA composite expanded particles is 2.6×10 5 cells / cm 3 , the expansion ratio is 32.

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Abstract

The invention discloses a preparation method of biodegradable polymer foamed particles, which comprises the following steps: (1) mixing polymer particles and a 0.5-8 MPa high-pressure fluid until the polymer particles are saturated, thereby obtaining the saturated polymer particles; and (2) putting the saturated polymer particles obtained in the step (1) in hot air with 60-150 DEG C, and foaming for 1-300 seconds, thereby obtaining the polymer foamed particles, wherein the polymer is polylactic acid, or a compound of polylactic acid and other polymers. The method is simple to operate, and can be easily used for industrial production; and the prepared foamed particles have the characteristics of high expansion ratio, smooth surface, high degree of crystallization, uniform foam pore structure, high foam pore density and the like.

Description

Technical field [0001] The present invention relates to the field of preparation methods of polymer expanded particles, and in particular to a method of preparing biodegradable polylactic acid or polylactic acid composite expanded particles. Background technique [0002] Polymer foam materials are widely used in the plastic packaging industry, construction industry, daily necessities, automobiles, biomedicine, aerospace and other fields due to their excellent performance and light weight. Among them, polystyrene foam material is the most widely used polymer foam material and is widely used in disposable lunch box products, buffer packaging, heat insulation and sound insulation materials, etc. However, polystyrene resin is difficult to degrade in the natural environment and is usually landfilled, which has caused serious problems to the environment. In recent years, countries around the world have successively issued laws banning or restricting the use of polystyrene foam ma...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L67/04
Inventor 翟文涛郑文革汪璟
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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