Self-balancing supercritical foaming method and self-balancing supercritical foaming device for multicomponent multiphase complex system

A foaming device and supercritical technology, applied in the field of pressure relief foaming after self-equilibrium swelling, can solve the problems of unstable foaming effect, fluctuation of material foaming effect, etc., and achieve the improvement of foaming ratio, uniform cell structure, The effect of improving the foaming ratio

Active Publication Date: 2019-11-22
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the invention is: to solve the process of adopting the main foaming agent and the auxiliary foaming agent, because there are differences in the permeability and dosage of the main foaming agent and the auxiliary foaming agent, resulting in the foaming of the material in the foaming process. The effect fluctuates over time and the foaming effect is unstable

Method used

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  • Self-balancing supercritical foaming method and self-balancing supercritical foaming device for multicomponent multiphase complex system
  • Self-balancing supercritical foaming method and self-balancing supercritical foaming device for multicomponent multiphase complex system
  • Self-balancing supercritical foaming method and self-balancing supercritical foaming device for multicomponent multiphase complex system

Examples

Experimental program
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Effect test

Embodiment 1

[0117] Such as figure 1In the device shown, the production of polypropylene foamed polymer material is taken as an example. First, polypropylene (the shape of the raw material is a block, the size is about 600 cm³, a total of 2 samples) is added to the high-pressure container (volume is about 5L), Use a liquid pump to transport excess n-hexane to the high-pressure vessel through the heated buffer tank, and at the same time raise the temperature of the high-pressure vessel to 140°C, and use the ISCO pump to pump 15MPa CO 2 The gas is sent to the high-pressure container through the heated buffer tank, and the ISCO pump is kept on to stabilize the pressure in the container, and the polymer is filled with CO 2 Swell in the atmosphere of n-hexane for 5 hours, so that the polymer can fully absorb CO 2 and n-hexane, then open the valve for 2 seconds to release the pressure, recycle the mixed foaming agent into the recovery device, use the recovery device to separate the phases of th...

Embodiment 2

[0129] Taking the production of polyphenylsulfone foamed polymer materials as an example, firstly, the polyphenylsulfone raw material is in the shape of a block, the size is about 600 cm³, a total of 2 samples) into a high-pressure container (volume is about 5L), and the high-pressure container Set the heating cable on the buffer bottle to the required temperature for foaming, use a liquid pump to transport excess distilled water through the buffer bottle to a high-pressure container, and use a booster pump to transfer 20MPa CO 2 The gas is delivered to the high-pressure container through the high-pressure buffer bottle, and the pressure of the high-pressure container is stabilized by the pressure reducing valve, and the PPSU is filled with CO 2 Swell in an atmosphere of distilled water for 5 hours, so that PPSU can fully absorb CO 2 and distilled water, then open the valve for 2 seconds to release the pressure, recycle the mixed foaming agent into the recovery device, use the...

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Abstract

The invention relates to a foaming and molding process and a foaming and molding device for a non-viscous polymer matrix by adopting mixed swelling of supercritical fluid and a blowing promotor. In the supercritical foaming field, the blowing promotor can promote the diffusion of the supercritical fluid in the non-viscous polymer matrix, reduce the foaming temperature of the supercritical fluid and improve the foaming rate of a foaming product. However, the supercritical fluid, the blowing promotor and a non-viscous polymer lead to extreme instability of a foaming process of a mixed foaming agent and extreme instability of cellular structures of the foaming products under a multicomponent multiphase complex system at high temperature and high pressure. For sufficiently realizing the synergistic effect of the blowing promotor and the supercritical fluid in promoting the supercritical foaming, the invention provides a self-adjusting foaming and molding process and a self-adjusting foaming and molding device for supercritical mixed fluid containing the blowing promotor under the multicomponent multiphase complex system, and thereby the self-balancing aim of the multicomponent multiphase complex system under the supercritical foaming condition is achieved, finally a foaming technology is stabilized, the cellular structure is improved and the performance of the products is improved.

Description

technical field [0001] The invention relates to a method and device for pressure relief and foaming after self-balanced swelling in a multiphase and multicomponent complex system in a supercritical state, and belongs to the technical field of supercritical foaming. Background technique [0002] In recent years, the preparation of microcellular polymer foam materials by supercritical foaming method has attracted extensive attention from new polymer materials and related industries, because the foam materials prepared by this process have many aspects such as large cell density, small pore size, and excellent performance. Advantages, and the method is applicable to a wide range of polymer materials and the processing process is green and environmentally friendly. Although all kinds of polymer materials can obtain porous structure through supercritical foaming method, for polymer materials with high foaming temperature and low magnification rate, it is necessary to use auxili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/34
CPCB29C44/60B29C44/35Y02P20/54
Inventor 龚鹏剑金碧辉张强黄亚江李光宪
Owner SICHUAN UNIV
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