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Method for preparing biodegradable polylactic acid foaming material

A polylactic acid foaming and biodegradable technology, applied in the field of foaming materials, can solve the problems that have not occurred before

Inactive Publication Date: 2010-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that in the domestic patented technology for the preparation of polylactic acid foaming materials, the method of adding chemical foaming agents is mainly used to prepare foaming materials, and no supercritical CO 2 Application of Foaming Method in Preparation of Polylactic Acid Foaming Material

Method used

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  • Method for preparing biodegradable polylactic acid foaming material
  • Method for preparing biodegradable polylactic acid foaming material
  • Method for preparing biodegradable polylactic acid foaming material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] PLA and PBAT are placed in a screw extruder, and the weight ratio of the two is 90% of PLA and 10% of PBAT. The extrusion temperature is 155°C, the extrusion time is 30min, and the screw speed is 70 rpm. 2 Foaming after swelling in the state. Extrude to obtain PLA / PBAT blend material.

[0033] Place the PLA / PBAT blended material in an autoclave, in which the volume of the material is not greater than one-twentieth of the volume of the autoclave to ensure sufficient space for foaming. Close the autoclave and fill the autoclave with low-pressure CO 2 Purge for several minutes to displace the air in the kettle. Place the autoclave in a water bath at 40°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 18MPa, and swell for 1 hour. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 2MPa / s. Take out the sample. Foam in a water bath at 100°C for 10s. Scanning electron m...

Embodiment 2

[0035] PLA and PBAT are placed in the screw extruder, and the weight ratio of the two is 70% of PLA and 30% of PBAT. The extrusion temperature was 155° C., the extrusion time was 30 minutes, the screw speed was 70 revolutions / min, and the PLA / PBAT blend material was obtained by extrusion.

[0036] Place the PLA / PBAT blended material in an autoclave, in which the volume of the material is not greater than one-twentieth of the volume of the autoclave to ensure sufficient space for foaming. Close the autoclave and fill the autoclave with low-pressure CO 2 Purge for several minutes to displace the air in the kettle. Place the autoclave in a water bath at 40°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 18MPa, and swell for 1 hour. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 2MPa / s. Take out the sample. Foam in a water bath at 100°C for 10s. Scanning electron microsco...

Embodiment 3

[0038] PLA and PBAT are placed in the screw extruder, and the weight ratio of the two is 50% of PLA and 50% of PBAT. The extrusion temperature was 155° C., the extrusion time was 30 minutes, the screw speed was 70 revolutions / min, and the PLA / PBAT blend material was obtained by extrusion.

[0039] Place the PLA / PBAT blended material in an autoclave, in which the volume of the material is not greater than one-twentieth of the volume of the autoclave to ensure sufficient space for foaming. Close the autoclave and fill the autoclave with low-pressure CO 2 Purge for several minutes to displace the air in the kettle. Place the autoclave in a water bath at 40°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 18MPa, and swell for 1 hour. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 2MPa / s. Take out the sample. Foam in a water bath at 100°C for 10s. Scanning electron micros...

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Abstract

The invention discloses the composition of a biodegradable polylactic acid (PLA) foaming material and a preparation method thereof. The method for preparing the biodegradable polylactic acid foaming material comprises the following steps: blending polylactic acid (PLA) and aliphatic-aromatic co-polyester toughening agent in a screw extruder; loading the extrudate into the fluid of supercritical CO2 to swell, so that the CO2 can be fully dissolved in the blended materials; then, releasing the pressure at a high rate, so as to supersaturate the CO2 in the composite material, thus achieving the thermodynamic instability; and nucleating and foaming to obtain the biodegradable PLA foaming material, wherein the toughening agent is particularly poly(butylenes adipate-co-terephthalate) (PBAT) in the invention. The method of the invention is capable of preparing the PLA foaming material with the cell diameter thereof being 0.9056mu m to 5.250mu m and the cell density thereof being 2.05*1,019 pieces / cm<3> to 2.01*1,022 pieces / cm<3>. The invention as a green and environment-friendly technique can improve the material performance and reduce the cost.

Description

technical field [0001] The invention relates to a preparation method in the technical field of foam materials, in particular to a preparation method of biodegradable polylactic acid foam materials. Background technique [0002] Due to the large number of cells in the matrix, foamed plastics have the characteristics of light weight, sound insulation, heat insulation, impact load absorption, material saving, and cost reduction. They are widely used in packaging, construction, transportation, and daily necessities. The main varieties of foam plastics are polyurethane, polystyrene and polyethylene. However, polyurethane, polystyrene, and polyethylene are non-biodegradable materials. The foaming agent used in the foaming process is mainly a chemical foaming agent, which pollutes the environment. Therefore, an environmentally friendly physical foaming agent is used to prepare a biological Degradable foamed plastics are necessary. [0003] with supercritical CO 2 , N 2 The phys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L67/04C08L67/02
Inventor 王方颉杨斌廖海剑严洁峰杨婧
Owner SHANGHAI JIAO TONG UNIV
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