Preparation method of biodegradable polymer foamed particles

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

Active Publication Date: 2012-05-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
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  • 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, which often leads to a longer production cycle
The above disclosed technical solutions have the technical problems of long production cycle and poor foaming effect

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
Comparison scheme
Effect test

Embodiment 1

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

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

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

Embodiment 2

[0040] In addition to the CO with 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 in Example 1, and polylactic acid foamed particles are obtained.

[0041] The prepared PLA expanded particles have smooth appearance structure. Scanning electron microscopy 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 in Example 1 to prepare foamed polylactic acid composite particles.

[0044] The prepared PLA composite foamed particles have smooth appearance structure. Scanning electron microscope analysis was performed on the quenched section of the PLA composite expanded particle sample, as shown in figure 2 , showing that the cell structure of PLA composite expanded particles is closed, which shows that the introduction of PBS inhibits the opening phenomenon of 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 canbe 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 invention relates to the field of preparation methods of polymer foamed particles, in particular to a preparation method of biodegradable polylactic acid or polylactic acid composite foamed particles. Background technique [0002] Polymer foam materials are widely used in plastic packaging, construction, daily necessities, automobiles, biomedical, 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, widely used in disposable lunch box products, cushioning packaging, heat insulation and sound insulation materials, etc. However, polystyrene resin is difficult to degrade in the natural environment, and it is usually landfilled, which has brought serious problems to the environment. In recent years, countries around the world have successively promulgated laws to prohibit or restrict the use of polystyrene foam materials. It is urgent to de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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