In-mold molded foaming forming device for thermoplastic polymer particles and forming method of forming device

Abstract

The invention discloses an in-mold molded foaming forming device for thermoplastic polymer particles and a forming method of the forming device. The forming device comprises a supercutical fluid conveying system, a mold pressing foaming system, a preheating quantitative feeding system and mobile guide rails, wherein the supercutical fluid conveying system is communicated with the mold pressing foaming system. The forming device is simple in structure, with the adoption of the one-step foaming forming method for the polymer particles, the polymer particles are not required to be pre-foamed andare directly added to a forming mold cavity, water and an anti-adhesion parting agent are not required, besides, a mold pressing weld forming process does not need high-pressure steam heating molding,the adhesion stress is large, the process is clean, and the process is suitable for polymer materials easy to hydrolyze; meanwhile, the heat demand in the processing procedure is less, heating efficiency of the polymer particles is high, temperature of the polymer particles is uniform, a polymer-particle microcellular-foaming mold pressing forming product with fine cells, accurate dimension and light weight is obtained, production efficiency is improved, automatic production is realized, and the device and the method are applicable to foaming mold pressing forming of most polymer particles.

Description

technical field [0001] The present invention relates to the technical field of foam molding of polymer particles, and more specifically relates to an in-mold foam molding device for thermoplastic polymer particles and a molding method thereof. Background technique [0002] At present, most of the industry adopts the batch reactor foaming method to produce polymer expanded beads. The process is: extrude the thermoplastic polymer resin composition, and cut it into particles with an average particle size of 0.5 to 4mm through underwater pelletizing. The polymer particles; then the polymer particles, water and water dispersion medium are added together into a constant temperature high-pressure reactor, and the polymer particles in the reactor are heated to a temperature higher than the softening point of the polymer by a heating device. Then, the supercritical fluid is filled to infiltrate and swell to reach diffusion equilibrium and form a polymer-supercritical fluid homogeneou...

AI Technical Summary

Problems solved by technology

Utilizing the supercritical penetration and diffusion energy of the supercritical fluid, under the action of a certain temperature and supercritical fluid pressure, after a certain period of time, the supercritical fluid gradually diffuses into the polymer matrix, and then quickly releases the pressure in the mold to obtain a certain shape of foam The device can be used for free foaming or controlled foaming. However, the above-mentioned foaming device is only suitable for the preparation of small batches of foaming materials with simple shapes, or for preparing standard foaming material samples for testing. not suitable for large-scale industrial production

[0005] The above-mentioned foaming device and method are produced by pre-preparing a preform of a certain simple shape, putting it into a mold to utilize the penetration and diffusion capabilities of supercritical fluid, and under a certain temperature and supercritical fluid pressure. After a certain period of time, the supercritical fluid gradually diffuses into the polymer matrix, and then quickly releases the pressure in the mold to obtain a certain shape of foaming material, which increases the complexity of the foaming process and increases the investment in equipment capital, which increases the production cost. And the production efficiency is low, the product cost is high, and it is not suitable for large-scale industrial production

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