Polymer foaming device and method for polymer foaming through polymer foaming device

Abstract

The invention discloses a polymer foaming device. The polymer foaming device comprises a mold, a radio-frequency power supply, a first radio-frequency electrode and a second radio-frequency electrode.The mold is provided with a mold cavity. A concave pit is formed in the cavity wall of the mold cavity. The first radio-frequency electrode and the second radio-frequency electrode are embedded in the concave pit. An interlayer is arranged in the concave pit and formed by compositing an electromagnetic wave shielding material and an electrical insulating material. The first radio-frequency electrode and the second radio-frequency electrode are connected with the anode and the cathode of the radio-frequency power supply through cables correspondingly. The invention further discloses a method for polymer foaming through the polymer foaming device. When the radio-frequency power supply is started, a high-frequency alternating electric field is formed between the first radio-frequency electrode and the second radio-frequency electrode, polymer is heated, and supercritical foaming is achieved. Compared with the prior art, the polymer foaming device is simple in structure, convenient to operate, even in heating and high in heating speed and efficiency and can be widely applied to production of foaming materials.

Description

technical field [0001] The invention relates to the technical field of polymer foaming equipment, in particular to a polymer foaming device and a polymer foaming method using the device. Background technique [0002] Polymer foaming materials are widely used in heat insulation, sound insulation, shock absorption, shoemaking and other fields. At present, the commonly used foaming methods of polymer materials include physical foaming and chemical foaming. The chemical foaming method refers to that after the chemical foaming agent is blended with the polymer material, at a certain temperature, the chemical foaming agent is decomposed by heat, generates gas, expands, and makes the polymer material foam. At present, the heating method is mainly electric heating. method, because the electric heating process heats the polymer material through heat conduction, that is, the mold is first heated by the electric heating plate, and the mold then transfers the heat to the material in th...

AI Technical Summary

Problems solved by technology

The first is extrusion foaming, that is, the polymer dissolved in supercritical fluid is extruded from a single-screw or twin-screw extruder, and is qualitatively shaped into a sheet or plate through a die. This method can obtain high foaming material, but the foam material has a single shape and can only be a sheet or rod material; the second is to extrude the polymer dissolved in the supercritical fluid into the mold, and the polymer foams in the mold. This method can Foaming materials with special shapes can be obtained, but only materials with small expansion ratios can be obtained; the third method is autoclave foaming, that is, putting the material into an autoclave, ventilating to apply pressure, and then heating with electricity or oil to The heat is transferred from the outside to the inside of the polymer material in the autoclave. The foamed material is usually foamed particles, such as the E-TPU material of Bavs. These foamed particles need to be hot-pressed. This method can Expanded particles with high expansion ratio can be obtained, but foamed materials with special shapes cannot be obtained. Both electric heating and oil heating have the problem of high energy consumption

In addition, in the first method and the second method, the required equipment is complicated and the cost is high

The traditional physical foaming technology involves electric heating or oil heating. Since the electric heating process heats the polymer material through heat conduction, the heating time is long, the local heating temperature is too high and some areas still have heating dead ends.

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