Equipment for polypropylene foaming

Abstract

The present invention discloses a device used to foam polypropylene. The device comprises a foaming tank body, the top of which is provided with a water inlet connection tube, a foaming agent inlet connection tube, a solid modified polypropylene inlet connection tube, a gas inlet connection tube, a pressure display connection tube, a vent connection tube and a safety valve connection tube; a stirring shaft, which is arranged at the center of the foaming tank body, is fixed on the upper end enclosure of the foaming tank body by a shaft housing; the upper end of the stirring shaft is provided with a stirring motor; the lower end of the stirring shaft is provided with a stirring impeller; the bottom of the foaming tank body is orderly connected with discharging outlet connection tubes, and the upper end is provided with a rapid pressure release valve; a foaming tank jacket is arranged outside the lower part of the foaming tank body; a steam inlet connection tube and a steam outlet connection tube are respectively arranged on the upper and the lower parts of the foaming tank jacket; a thermometer connection tube is arranged on the middle part of the foaming tank body. The device can ensure the uniform heat transmission and mass transfer of the polypropylene in order to ensure uniform foaming, and since the fluid can flow smoothly, foamed polypropylene particles cannot easily stickto the wall, thus ensuring the polypropylene foaming quality and the stable operation of the device.

Description

technical field [0001] The invention relates to a chemical plant, in particular to a device for foaming polypropylene. Background technique [0002] The invention relates to a device that utilizes fluid flow, fluid mass transfer and fluid heat transfer to make polypropylene foam in a foaming device with good mass transfer, heat transfer and flow, maintain non-sticking, and quickly release pressure for foaming. [0003] In the existing technology, there are mainly two types of equipment for polypropylene foaming: extrusion foaming and rapid pressure relief foaming. Extrusion foaming is difficult to control the temperature and it is difficult to ensure the quality of foamed polypropylene. This technology is only mastered by a few companies in the world such as Germany and Japan; rapid pressure relief foaming is easy to control the temperature. It has received extensive attention in industrial research, but most of the equipment for rapid pressure relief and foaming of polypro...

AI Technical Summary

Problems solved by technology

Extrusion foaming is difficult to control the temperature and it is difficult to ensure the quality of foamed polypropylene. This technology is only mastered by a few companies in the world such as Germany and Japan; rapid pressure relief foaming is easy to control the temperature. It has received extensive attention in industrial research, but most of the equipment for rapid pressure relief and foaming of polypropylene adopts a common reactor including a stirring paddle structure, which is not smooth when the fluid is discharged quickly, polypropylene particles are easily deformed, and polypropylene foaming is not smooth. Disadvantages of homogeneity, polypropylene foam particles are easy to stick to the wall, etc.

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