Experimental device for dissolution of supercritical CO2 in polymer melt under interface renewal conditions

Abstract

An experimental facility for dissolving supercritical CO2 in polymer melt under the condition of interface updating comprises a gas cylinder, a pressure reducing valve, a pressure data display instrument, a booster pump, an oil bath heating container, a pressure chamber 1, an overflow valve, an oil pump, a pressure sensor, a control system, a pressure chamber 2, a magnetic coupling, an external driving motor and a changeable mixing element. By the experimental facility, mutual effects of shearing rate and homogeneous body rheological properties under different temperature and pressure conditions, dissolvability and dissolved quantity as well as influences of process parameters such as temperature, pressure and revolving speed and the structure of the mixing element to the dissolving speed of the supercritical CO2 in the polymer melt are researched. A new theory of dissolving and dispersing of CO2 in the polymer melt is further verified, the formation characters of a homogeneous body in a micropore plastic continuous forming process can be known essentially, the process parameters are formulated reasonably, molds and equipment are improved reasonably, the novel technology is promoted to be mature as soon as possible, and the experimental facility has important practical significance.

Description

technical field [0001] The invention relates to the field of experimental devices for dissolving supercritical gas in polymer melts, in particular to a supercritical CO 2 Experimental setup for dissolution in polymer melts. Background technique [0002] Due to its unique structure, microporous plastics have many superior comprehensive properties, such as light weight, high impact strength, good toughness, low conductivity, excellent sound insulation and heat insulation effects, and have a very wide range of application prospects, known as "21 new materials of the century". There are many methods for molding microporous plastics, among which the supersaturated gas method has the most potential for industrial application. Because CO 2 The supercritical state of CO is easy to reach, so most of the research on microporous plastics since the 1990s revolves around supercritical CO 2 Expand. [0003] And whether it is possible to increase the supercritical CO 2 The dissolutio...

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Problems solved by technology

[0003] And whether it is possible to increase the supercritical CO 2 The dissolution rate depends on the reasonable formulation of process parameters and the reasonable design of the structure of the screw and mixing elements. Although it is known that the formation time of the homogeneous body is shortened during the continuous molding of microporous plastics because of the shearing and mixing of the screw and mixing elements, but What is the specific mechanism of action? Is it due to shear, reduction in viscosity, or interface renewal? At present, there are few reports in the literature on the experimental setup of the dissolution amount and dissolution rate under the action of the screw and mixing elements

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