Supercritical assisted green regeneration process combining double-rotator continuous mixer with screw extruder

Abstract

The invention discloses a supercritical assisted green regeneration process combining a double-rotator continuous mixer with a screw extruder. The supercritical assisted green regeneration process comprises the following steps: feeding rubber particles obtained by crushing and separating a waste tire into the double-rotator continuous mixer, wherein in a supercritical fluid environment, rubber particles are subjected to high-shearing and strong stretching effects of a double-rotator mixing flow field, so that the rubber particles are promoted to carry out low-temperature green devulcanizing regeneration; then, performing extruding forming on the rubber particles by the screw extruder, and finally, sealing, cooling and drying the rubber particles to obtain granular regenerated rubber, and packaging and warehousing the granular regenerated rubber. According to the process, a granular restored regenerated rubber product is prepared by virtue of directed selective green devulcanizing regeneration through low-temperature / high-shearing / strong stretching of the supercritical fluid assisted waste rubber particle mixing flow field of the double-rotator mixer; and by not requiring to add any chemical auxiliaries and only depending on the mechanical force chemical reaction principle in the production process, continuous, green and safe production of the granular regenerated rubber product is realized from waste rubber particles by utilizing stress inducing to break a three-dimensional grid structure in the product.

Description

Technical field [0001] The invention relates to the field of waste rubber regeneration technology, in particular to a green regeneration technology of a supercritical auxiliary double-rotor continuous mixer and screw extruder. Background technique [0002] The production of a large number of waste tires in China has caused damage to the human living environment. How to turn them into treasures and resource recycling has attracted widespread attention. China mainly produces recycled rubber. After years of research and practical experience, the domestic recycled rubber production experience is the first From oil method, water-oil method to traditional high temperature and high pressure dynamic desulfurization method, and then to the normal pressure continuous plasticization method that uses "machine" instead of "tank" to be promoted at this stage, they are always prone to secondary pollution or poor product performance. And other shortcomings, it is difficult to further promote the...

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Problems solved by technology

[0002] The production of a large number of waste tires in China has caused damage to the living environment of human beings. How to turn them into treasures and recycle them has attracted widespread attention. my country mainly produces recycled rubber. After years of research and practical experience, the domestic recycled rubber production experience is initially Oil method, water-oil method, traditional high-temperature and high-pressure dynamic desulfurization method, and then to the normal-pressure continuous plasticization method that replaces "tank" with "machine" at this stage, they always have secondary pollution or unsatisfactory product performance. and other shortcomings, it is difficult to further promote the application

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