Method for preparing poly hexane diacid-terephthalic acid-butylene terephthalate foaming material

A technology of terephthalic acid and polyadipic acid, applied in the production of bulk chemicals, etc.

Inactive Publication Date: 2009-03-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in many supercritical CO 2 Among foa...

Method used

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  • Method for preparing poly hexane diacid-terephthalic acid-butylene terephthalate foaming material
  • Method for preparing poly hexane diacid-terephthalic acid-butylene terephthalate foaming material
  • Method for preparing poly hexane diacid-terephthalic acid-butylene terephthalate foaming material

Examples

Experimental program
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Embodiment 1

[0025] The PBAT material is placed in the autoclave, wherein the volume of the PBAT material is not greater than one-twentieth of the volume of the autoclave, so as to ensure that the PBAT material has enough 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 high-pressure reactor in a water bath at 85°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 20MPa, and swell for 2 hours. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 5MPa / s. The sample was taken out, and its quenched surface was analyzed by scanning electron microscope. The cell diameter of the PBAT foamed sample is 40.23 μm, and the cell density is 8.36×10 7 piece / cm 3 , the foamed sample expands about 10 times compared to the volume of the raw material. From the point of view of the cell shape, the cell...

Embodiment 2

[0027] The PBAT material is placed in the autoclave, wherein the volume of the PBAT material is not greater than one-twentieth of the volume of the autoclave, so as to ensure that the PBAT material has enough 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 high-pressure reactor in a water bath at 85°C, and use a high-pressure pump to pump CO 2Fill the autoclave until the pressure reaches 14MPa, and swell for 2 hours. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 5MPa / s. The sample was taken out, and its quenched surface was analyzed by scanning electron microscope. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 5MPa / s. The sample was taken out, and its quenched surface was analyzed by scanning electron microscope. The cell diameter of the ...

Embodiment 3

[0029] The PBAT material is placed in the autoclave, wherein the volume of the PBAT material is not greater than one-twentieth of the volume of the autoclave, so as to ensure that the PBAT material has enough space for foaming and molding. 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 high-pressure reactor in a water bath at 85°C, and use a high-pressure pump to pump CO 2 Fill the autoclave until the pressure reaches 10MPa, and swell for 2 hours. Then quickly relieve the pressure until the gauge pressure is normal pressure, and the pressure relief rate is 5MPa / s. The sample was taken out, and its quenched surface was analyzed by scanning electron microscope. The cell diameter of the PBAT foamed sample is 58.13 μm, and the cell density is 9.55×10 6 piece / cm 3 , the foamed sample expands about 5 times in volume compared with the raw material. The experimental results such as cell dia...

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Abstract

The invention discloses a method for preparing a foaming material of poly adipic acid-terephthalic acid-butylene, which belongs to the technical field of biodegradable polymer materials. The method comprises the following steps of: placing the poly adipic acid-terephthalic acid-butylene (PBAT) material into CO2 fluid in a supercritical state to swell so as to massively dissolve the CO2 in the PBAT material; simultaneously keeping enough intensity and size stability of the PBAT material; and allowing the CO2 in the PBAT material to supersaturate through rapid pressure relief to form thermodynamic instability so as to nucleate and foam to obtain the foaming material of the poly adipic acid-terephthalic acid-butylene. The method can obtain the obturator PBAT foaming material with the cell diameter of between 22.10 and 119.02 microns and the cell density of between 2.62 x 10 <6> and 4.51 x 10 <8> per cubic meter.

Description

technical field [0001] The invention relates to a method for preparing a foaming material in the technical field of biodegradable polymer materials, in particular to a poly(butylene adipate-co-terephthalate) ), abbreviated as PBAT) foaming material preparation method. Background technique [0002] Due to the large number of cells in the matrix, foam plastic has the characteristics of light weight, sound insulation, heat insulation, impact load absorption, material saving, and cost reduction. It is widely used in packaging, construction, transportation, daily necessities and other departments. Over the past two decades, the foam plastic industry at home and abroad has developed rapidly, and the application area has become wider and wider. The market demand for foam plastic has continued to grow rapidly. The main varieties of foam plastics are polyurethane, polystyrene and polyethylene. However, since polyurethane, polystyrene, and polyethylene are non-biodegradable material...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L67/02
CPCY02P20/54
Inventor 林士全杨婧严洁峰杨斌赵亚平
Owner SHANGHAI JIAO TONG UNIV
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