2, 5-furan diformyl copolyester foam material and preparation method thereof

Abstract

The invention relates to a 2, 5-furan diformyl copolyester foam material and a preparation method thereof. The preparation method comprises the steps of (a) putting 2,5-furan diformyl copolyester plastic into a mold, pressing into a laminated preform, and quenching the laminated preform; (b) putting the quenched preform and a first foaming agent into a sealed container without contacting, whereinthe first foaming agent is at least one of chloroform, acetone, diethyl ether, pentane and hexafluoroisopropanol; (c) feeding a second foaming agent into the sealed container, wherein the second foaming agent is at least one of carbon dioxide and nitrogen; keeping the temperature in the sealed container to be 40 DEG C to 65 DEG C, enabling the first foaming agent to change into a gas state from aliquid state, and keeping the pressure in the sealed container to be 2MPa to 5MPa, wherein the pressure keeping time is 5h to 10h; (d) releasing a gas in the sealed container, taking the preform out,putting into a foaming medium for foaming, and cooling to obtaining the 2,5-furan diformyl copolyester foam material with the cell size being 5 microns to 50 microns and the expansion rate being 2 times to 15 times.

Description

technical field

[0001] The invention relates to the technical field of polymer foaming materials, in particular to 2,5-furandicarboxylic acid-based copolyester foaming materials and a preparation method thereof. Background technique

[0002] As a microporous material with a special structure, the polymer foam material has the advantages of light weight, good impact resistance, high specific strength, heat insulation, and sound absorption. At present, polymer foaming materials have been widely used in packaging, household appliances, auto parts, sports, construction, separation membranes, oil-absorbing materials, medicine and other fields.

[0003] In recent years, 2,5-furandicarboxylic acid-based copolyesters have been extensively studied. The reason is: Compared with polyethylene terephthalate (PET), the difficult-to-reversal furan ring structure on the main chain of 2,5-furandicarboxylate copolyester endows it with better rigidity and heat resistance and gas barrier prop...

Examples

preparation example Construction

[0021] The preparation method of 2,5-furandicarboxylate copolyester foam material provided by the invention comprises the following steps:

[0022] (a) placing 2,5-furandicarboxylate copolyester plastic in a mold, and pressing it into a thin-plate-shaped preform, and then quenching the thin-plate-shaped preform;

[0023] (b) placing the quenched preform and the first foaming agent in a closed container; wherein, the first foaming agent is not in contact with the preform, and the first foaming agent is At least one of chloroform, acetone, ether, pentane, and hexafluoroisopropanol;

[0024] (c) feed a second blowing agent into the airtight container again, the second blowing agent is at least one of carbon dioxide and nitrogen, and keep the temperature in the airtight container at 40°C to 65°C , so that the first foaming agent changes from a liquid state to a gaseous state, while maintaining the pressure in the airtight container at 2MPa to 5MPa, and the pressure holding time i...

Embodiment 1

[0042] Place the PEFT-30 plastic granules in a vacuum oven and dry at 80°C for 10 hours to remove the moisture in the PEFT-30 plastic granules, so that the water content of the PEFT-30 plastic granules is ≤0.05wt.%.

[0043] Then put the PEFT-30 plastic particles in a mold, and press it into a thin plate-shaped preform with a thickness of 1mm on a molding machine at 200 ° C. The thin plate-shaped preform is in a molten state, and then the molten preform in the mold The preform together with the mold is placed in liquid nitrogen for quenching treatment for 5 minutes to obtain a quenched preform.

[0044] Place the quenched preform and the beaker containing ether together in the autoclave without contact, and use 1 mL of ether for every 50 g of the preform. Set the temperature inside the autoclave to 45°C to vaporize ether, and at the same time fill the autoclave with carbon dioxide gas to keep the pressure inside the autoclave at 4 MPa for 6 hours.

[0045] Quickly remove the ...

Embodiment 2

[0048] Place the PEFT-30 plastic granules in a vacuum oven and dry at 80°C for 10 hours to remove the moisture in the PEFT-30 plastic granules, so that the water content of the PEFT-30 plastic granules is ≤0.05wt.%.

[0049] Then put the PEFT-30 plastic particles in a mold, and press it into a thin plate-shaped preform with a thickness of 1mm on a molding machine at 200 ° C. The thin plate-shaped preform is in a molten state, and then the molten preform in the mold The preform together with the mold is placed in liquid nitrogen for quenching treatment for 6 minutes to obtain a quenched preform.

[0050] Place the quenched preform and the beaker containing ether together in the autoclave without contact, and use 1 mL of ether for every 50 g of the preform. Set the temperature inside the autoclave to 40°C to vaporize ether, and at the same time fill the autoclave with carbon dioxide gas to keep the pressure inside the autoclave at 4 MPa for 6 hours.

[0051] Quickly remove the ...

technical field

[0001] The invention relates to the technical field of polymer foaming materials, in particular to 2,5-furandicarboxylic acid-based copolyester foaming materials and a preparation method thereof. Background technique

[0002] As a microporous material with a special structure, the polymer foam material has the advantages of light weight, good impact resistance, high specific strength, heat insulation, and sound absorption. At present, polymer foaming materials have been widely used in packaging, household appliances, auto parts, sports, construction, separation membranes, oil-absorbing materials, medicine and other fields.

[0003] In recent years, 2,5-furandicarboxylic acid-based copolyesters have been extensively studied. The reason is: Compared with polyethylene terephthalate (PET), the difficult-to-reversal furan ring structure on the main chain of 2,5-furandicarboxylate copolyester endows it with better rigidity and heat resistance and gas barrier prop...

Examples

preparation example Construction

[0021] The preparation method of 2,5-furandicarboxylate copolyester foam material provided by the invention comprises the following steps:

[0022] (a) placing 2,5-furandicarboxylate copolyester plastic in a mold, and pressing it into a thin-plate-shaped preform, and then quenching the thin-plate-shaped preform;

[0023] (b) placing the quenched preform and the first foaming agent in a closed container; wherein, the first foaming agent is not in contact with the preform, and the first foaming agent is At least one of chloroform, acetone, ether, pentane, and hexafluoroisopropanol;

[0024] (c) feed a second blowing agent into the airtight container again, the second blowing agent is at least one of carbon dioxide and nitrogen, and keep the temperature in the airtight container at 40°C to 65°C , so that the first foaming agent changes from a liquid state to a gaseous state, while maintaining the pressure in the airtight container at 2MPa to 5MPa, and the pressure holding time i...

Embodiment 1

[0042] Place the PEFT-30 plastic granules in a vacuum oven and dry at 80°C for 10 hours to remove the moisture in the PEFT-30 plastic granules, so that the water content of the PEFT-30 plastic granules is ≤0.05wt.%.

[0043] Then put the PEFT-30 plastic particles in a mold, and press it into a thin plate-shaped preform with a thickness of 1mm on a molding machine at 200 ° C. The thin plate-shaped preform is in a molten state, and then the molten preform in the mold The preform together with the mold is placed in liquid nitrogen for quenching treatment for 5 minutes to obtain a quenched preform.

[0044] Place the quenched preform and the beaker containing ether together in the autoclave without contact, and use 1 mL of ether for every 50 g of the preform. Set the temperature inside the autoclave to 45°C to vaporize ether, and at the same time fill the autoclave with carbon dioxide gas to keep the pressure inside the autoclave at 4 MPa for 6 hours.

[0045] Quickly remove the ...

Embodiment 2

[0048] Place the PEFT-30 plastic granules in a vacuum oven and dry at 80°C for 10 hours to remove the moisture in the PEFT-30 plastic granules, so that the water content of the PEFT-30 plastic granules is ≤0.05wt.%.

[0049] Then put the PEFT-30 plastic particles in a mold, and press it into a thin plate-shaped preform with a thickness of 1mm on a molding machine at 200 ° C. The thin plate-shaped preform is in a molten state, and then the molten preform in the mold The preform together with the mold is placed in liquid nitrogen for quenching treatment for 6 minutes to obtain a quenched preform.

[0050] Place the quenched preform and the beaker containing ether together in the autoclave without contact, and use 1 mL of ether for every 50 g of the preform. Set the temperature inside the autoclave to 40°C to vaporize ether, and at the same time fill the autoclave with carbon dioxide gas to keep the pressure inside the autoclave at 4 MPa for 6 hours.

[0051] Quickly remove the ...

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