Autoclave pressure foaming device and method for polypropylene expanded beads

Abstract

The invention relates to a kettle pressure foaming device for polypropylene foam beads, comprising the following components: a reaction kettle (9), an auxiliary preparation kettle (1), a weighing bin (8), an inert foaming agent The pressure supplement tank (10), the compressed air pressure supplement tank (11) and the material collection tank (13); wherein, the reaction kettle (9) is provided with a feed port, a material discharge port and a gas phase inlet and outlet, and the feed port and the auxiliary The agent preparation kettle (1) is connected with the discharge port of the weighing silo (8), the gas phase inlet and outlet are connected with the air outlet of the inert foaming agent supplementary pressure tank (10) and the air outlet of the compressed air supplementary pressure tank (11). The discharge port of (9) is connected with the material collection tank (13), and a cooling sprayer (12) is arranged above the material collection tank (13). By adopting the device of the invention, workers do not need to be on the production site, but only need to operate in the control room, thereby reducing the degree of dependence on manual operation and facilitating large-scale and high-efficiency production.

Description

technical field [0001] The invention belongs to the field of polymer material processing, and particularly relates to a kettle pressure foaming device and method for polypropylene foam beads. Background technique [0002] Expanded polypropylene (EPP) materials have excellent mechanical properties, heat resistance, low temperature resistance, chemical resistance, oil resistance and other advantages, and are widely used in packaging materials, auto parts, thermal insulation and building materials. At present, the industrialized preparation technology of EPP mainly includes batch preparation technology of autoclave (referred to as kettle method) and continuous preparation technology (referred to as extrusion method) combining extrusion foaming and underwater pelletizing. [0003] Among them, the principle of preparing EPP beads by the kettle method is to fully diffuse the foaming agent into the softened small polypropylene particles under high temperature and high pressure, and...

AI Technical Summary

Problems solved by technology

However, this process also has some problems, such as: the process is relatively complicated, the autoclave pressure foaming link is low in automation, and it relies on manual operation; when the reactor is unloaded, the high-temperature material discharged from the reactor will form a large amount of steam, resulting in a poor operating environment; At the foaming temperature, the polypropylene particles have already begun to soften, so the particles are easy to stick to each other after being discharged, which affects the product qualification rate

These factors all restrict the large-scale production of EPP beads, and limit the production efficiency to a large extent, resulting in higher comprehensive costs.

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