Supercritical-CO2-assisted ozone desulfurization regeneration technique of waste rubber

Abstract

The invention discloses a supercritical-CO2-assisted ozone desulfurization regeneration technique of waste rubber. The technique comprises the following steps: waste tires are subjected to crushing and separation by an automatic-linkage crushing line to obtain 20-50-mesh rubber powder, the rubber powder is sent into a co-rotating full-engagement double screw extruder and subjected to compounding plasticizing and preheating, and supercritical CO2 is introduced to the rear section of the double screw extruder so that the preheated plasticized rubber powder is subjected to the strong permeation and swelling actions of the supercritical CO2; in the auger delivery process, an ozone generator emits ozone which acts on the swollen plasticized rubber powder, and the crosslinked network structure of the swollen plasticized rubber powder is selectively destroyed under the ozonization action, thereby implementing the selective desulfurization regeneration; the rubber powder is subjected to complete desulfurization and extrusion forming by a screw extruder, and finally, subjected to after-treatment to obtain the green environment-friendly granular regenerated rubber; and the granular regenerated rubber is packaged and warehoused. The whole regeneration process does not need any chemical aid, and the obtained product is green and environment-friendly and has superior performance.

Description

technical field [0001] The invention relates to the field of waste rubber regeneration technology, in particular to a supercritical CO 2 Auxiliary waste rubber ozone desulfurization regeneration process. Background technique [0002] my country is a big producer of waste tires, and the accumulation of a large number of waste tires is not easy to degrade, which has caused serious harm to the surrounding environment. In order to solve this hazard, the production of recycled rubber has become the main way to deal with waste tires in my country. The principle is to destroy the three-dimensional network structure and restore its processing performance by physical or chemical methods. At present, there are many regeneration methods such as mechanical method, thermal Degradation method, ultrasonic method, chemical method, microwave method, biological method, etc., but these methods also cause the breakage of the main chain of macromolecules to a certain extent while destroying its ...

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Problems solved by technology

Ozone is used to oxidize and functionalize the surface of vulcanized rubber powder. After a short time and slight ozonation, the treated rubber powder only shows acidity and hydrophilicity. Oxidation can selectively destroy its cross-linked network structure and hardly produce low molecular weight substances. After treatment, the rubber powder can be hot-pressed, but the disadvantage of this method has not yet achieved continuous production

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