Integrated device for waste plastic recycling with gas protection and modified granulation

Abstract

The invention discloses a gas protection and modified granulation integrated device for waste plastic recycling, and relates to waste plastic recycling. The device is provided with a single-screw extrusion granulator, a protective gas storage tank, a pressure reducing and regulating device, a gas supply pipe, a hollow pin with a check valve, a single-screw extruder modified medicament connecting port, a modified medicament storage tank, a stirrer, a feed port, a metering and feeding screw, electric heating sheets, an electric heating control box, a speed regulating motor and a discharge port; an outlet of the protective gas storage tank is connected with an inlet of the pressure reducing and regulating device; an outlet of the pressure reducing and regulating device is connected with the hollow pin with the check valve by the gas supply pipe; the stirrer is arranged in the modified medicament storage tank; the feed port of the modified medicament storage tank is in a butt joint with the metering and feeding screw; the electric heating sheets are arranged on an outer sleeve of the metering and feeding screw, and are electrically connected with the electric heating control box; the discharge port of the metering and feeding screw is in a butt joint with the single-screw extruder modified medicament connecting port through an enamel disc; and the speed regulating motor is connected with the metering and feeding screw.

Description

technical field [0001] The invention relates to the recycling of waste plastics, in particular to an integrated device for recycling waste plastics with gas protection and modified granulation. Background technique [0002] Due to its good chemical stability, easy processing, low price, light weight and other advantages, plastics are increasingly widely used. But the average lifespan of plastics is very short. Taking polyethylene as an example, the average lifespan is 1.5 years. Therefore, about 30 million tons of waste plastics are discarded in China alone every year, causing serious pollution. [0003] Thermoplastic waste plastics can be recycled through thermal melting. The process requirements are simple and easy to realize. It is an important part of typical resource regeneration and circular economy. [0004] During the use and disposal of waste plastics, due to the many impurities mixed in, the plastic components are mixed, and the physical and chemical properties ar...

AI Technical Summary

Problems solved by technology

[0006] There are two serious and insurmountable shortcomings in the existing plastic recycling industry: (1) In view of the mixed plastic components in waste plastics and the use of water washing in the process of removing plastic impurities, the raw materials have high moisture content. In order to make them melt and intermelt, High-temperature processing is often adopted, which often causes overheating, oxidation, and chain breakage of low-melting components, resulting in poor product quality, and at the same time produces a large amount of waste gas, causing serious secondary pollution

Serious disadvantages of high energy consumption, poor modification effect and high cost

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