Supercritical CO2 foaming system used for microporous polymer preparation

Abstract

The invention discloses a supercritical CO2 foaming system used for microporous polymer preparation. The system comprises a gas supply unit, a gas-liquid separation unit, a pressurizing unit, a preheating unit, and a supercritical CO2 high pressure reaction vessel that are connected in order. The supercritical CO2 high pressure reaction vessel includes a high pressure reaction vessel, the external surface of which is provided with multifrequency ultrasonic generators. The foaming system utilizes the high-frequency vibration of ultrasonic waves to enhance the diffusion rate and nucleation rateof supercritical CO2, thus not only being able to shorten the time period of a foaming technology, but also being able to improve the foaming performance of a polymer. The system of the invention introduces multifrequency ultrasonic waves into a supercritical CO2 foaming instrument for the first time, and can substantially improve the diffusion rate and extraction efficiency of CO2 in a polymer matrix.

Description

technical field [0001] The invention relates to the technical field of microporous polymer preparation devices, in particular to a supercritical CO 2 Foaming system. Background technique [0002] Microporous polymer materials have the advantages of light weight, high impact strength, good sound insulation, and low dielectric constant and thermal conductivity. The material is widely used in household daily necessities, vehicles, packaging and construction; while high-performance thermosetting microporous polymer materials play an important role in cutting-edge fields such as electronics, military, and aerospace. Therefore, how to improve the performance of microporous polymer materials is a very urgent problem. [0003] Although using supercritical CO 2 , N 2 The process theory of microcellular foamed thermoplastic polymers is mature. However, in the process of fabricating microporous polymer materials, conventional supercritical CO 2 When the microcellular foaming equi...

AI Technical Summary

Problems solved by technology

However, in the process of fabricating microporous polymer materials, conventional supercritical CO 2 When the microcellular foaming equipment is deflated, the noise is loud and the CO 2 The diffusion rate is low, the interfacial tension between the polymer and the bubble is large, and the CO 2 The solubility in the polymer is small, and the cell diameter of the resulting foamed material is large

[0004] In summary, the current supercritical CO 2 The existing problems in the preparation of foamed thermoplastic polymers are as follows, when the gas is released, the noise is large, the CO 2 The diffusion rate is low, the interfacial tension between the polymer and the bubble is large, and the CO 2 The solubility in the polymer is small, and the cell diameter of the resulting foamed material is large

Images