Industrially-applicable method for preparing polymer foamed material by using supercritical fluid technology

A supercritical fluid and foaming material technology, which is applied in the field of industrialized supercritical fluid technology to prepare polymer foaming materials, can solve the problems of uneven pore size distribution, low pressure reduction rate, small foaming ratio, etc. The effect of high expansion ratio, fast pressure reduction rate and short equilibration time

Active Publication Date: 2012-06-20
CHANGZHOU TIANSHENG NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for faster formation of bubbles with greater density than traditional methods like extrusion or injection molding techniques. It also increases productivity by allowing more gases into the resulting foam without causing it to solidify too quickly during this process.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance of certain types of chemical reactions called supercritically fluided phase reaction(SFR). Specifically, SFR involves preparing tiny particles called nanofoams instead of larger ones like macroscopic polystyrene foam due to their unique structure and excellent physical characteristics. These nanoparticles help create porous structures inside the reactants while reducing them's own weights. Additionally, they provide improved thermal conductivity compared to regular polyethylene foam. However, there exist challenges related to efficient and effective use of these fine powders when making microspheral foamy materials.

Method used

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  • Industrially-applicable method for preparing polymer foamed material by using supercritical fluid technology
  • Industrially-applicable method for preparing polymer foamed material by using supercritical fluid technology
  • Industrially-applicable method for preparing polymer foamed material by using supercritical fluid technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]Firstly, general-purpose polypropylene pellets with low crystallinity are selected, and a conventional mixing process is used to produce a embryonic plate with a certain size (180×180×10mm) and a crystallinity of less than 30%.

[0046] Then place the prefabricated polypropylene foamed embryonic board (180×180×10mm) in a high-temperature foaming container, where the foaming container should reserve enough space for volume expansion required for swelling, penetration and nucleation to ensure that the board can be uniform. of nucleation.

[0047] Then replace the oxygen in the foaming container, and then fill it with high-pressure gas CO 2 . The temperature of the high-pressure vessel is kept constant at 145°C, the pressure of the supercritical fluid is controlled at 20MPa, and the swelling and permeation is 0.5h.

[0048] After the balance is reached, the pressure is quickly released to 0, and the pressure release rate is controlled at 50MPa / s. The swollen polypropylene...

Embodiment 2

[0050] Firstly, general-purpose polypropylene pellets with low crystallinity are selected, and a conventional mixing process is used to produce a embryonic plate with a certain size (180×180×10mm) and a crystallinity of less than 30%.

[0051] Then place the prefabricated polypropylene foamed embryonic board (180×180×10mm) in a high-temperature foaming container, where the foaming container should reserve enough space for volume expansion required for swelling, penetration and nucleation to ensure that the board can be uniform. of nucleation.

[0052] Then replace the oxygen in the foaming container, and then fill it with high-pressure gas CO 2 . The temperature of the high-pressure vessel is kept constant at 150°C, the pressure of the supercritical fluid is controlled at 15MPa, and the swelling and permeation is performed for 1 hour.

[0053] After the balance is reached, the pressure is quickly released to 0, and the pressure release rate is controlled at 100MPa / s. The swo...

Embodiment 3

[0055] Firstly, general-purpose polypropylene pellets with low crystallinity are selected, and a conventional mixing process is used to produce a embryonic plate with a certain size (180×180×10mm) and a crystallinity of less than 30%.

[0056] Then place the prefabricated polypropylene foamed embryonic board (180×180×10mm) in a high-temperature foaming container, where the foaming container should reserve enough space for volume expansion required for swelling, penetration and nucleation to ensure that the board can be uniform. of nucleation.

[0057] Then replace the oxygen in the foaming container, and then fill it with high-pressure gas CO 2 . The temperature of the high-pressure vessel was kept constant at 155°C, the pressure of the supercritical fluid was controlled at 10MPa, and the swelling and permeation took 1.5h.

[0058] After the balance is reached, the pressure is quickly released to 0, and the pressure release rate is controlled at 300MPa / s. The swollen polypro...

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Abstract

The invention discloses an industrially-applicable method for preparing a polymer foamed material by using supercritical fluid technology, which comprises the following steps: 1) forming a polymer raw material to be foamed into raw blanks by melting, blending and cooling; 2) placing the raw blanks in a container, charging supercritical fluid into the container, and allowing the raw blanks to swell and the supercritical fluid to permeate into the raw blanks; and 3) initiating nucleation and foaming by controlling pressure relief rate and obtaining the closed micro pore polymer foamed material with uniform pore diameter and adjustable pore density. According to the invention, the process is simple, the production process is clean and environment-friendly, the efficiency is high, and the prepared foamed material has high mechanical performance and can be used in fields of transportation vehicles, building materials, packages and the like.

Description

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Claims

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Application Information

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Owner CHANGZHOU TIANSHENG NEW MATERIALS RES INST CO LTD
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