Desulfurization method of waste tire rubber powder

Abstract

The invention provides a waste tire rubber powder desulfurization method which comprises the following steps: adding 100 parts by weight of waste tire rubber powder and 5-20 parts by weight of extract oil into a closed container, uniformly mixing at normal temperature, then adding 5-10 parts by weight of dodecanethiol and 5-10 parts by weight of lauric acid, and uniformly mixing to obtain a primary mixture; heating the primary mixed material to 90-100 DEG C, and stirring at a high speed of 600rad / min for 30 minutes to obtain a mixed rubber material; the mixed rubber material is subjected to melt extrusion through a conical double-screw extruder, the conical double-screw extruder has a circulating extrusion function and can control the extrusion time, the rotating speed of screws is controlled to be 80-100 rad / min, the temperature of a machine barrel is 220 DEG C, the extrusion time is 15 min, pelletizing is conducted after extrusion, the desulfurization process of the waste tire rubber powder is completed, and desulfurized rubber is obtained. The system can realize accurate desulfurization, and is simple to operate, low in energy consumption and high in desulfurization degree.

Description

technical field [0001] The invention belongs to the technical field of recycled rubber, in particular to a desulfurization method for waste tire rubber powder. Background technique [0002] With the rapid development of the automobile industry, a large number of waste tires are produced every year all over the world. Usually, the traditional disposal methods of waste tires are landfill, burning, crushing and so on. However, since waste tires are industrial hazardous solid waste, their landfill will deteriorate the natural environment, destroy vegetation growth, and affect human health. Combustion will produce a large amount of harmful gas, which seriously pollutes the atmospheric environment. Therefore, it is of great strategic significance to turn waste tires into treasures and recycle them. [0003] Currently commonly used desulfurization methods include physical, chemical, and biological desulfurization. The process of preparing desulfurized rubber by screw extrusion i...

AI Technical Summary

Problems solved by technology

Mechanical extrusion desulfurization has the problems of high processing temperature, fast speed, and low desulfurization efficiency. To obtain higher desulfurization efficiency, it may be necessary to increase the desulfurization temperature, which will cause the problem that the double bonds are simultaneously opened during the desulfurization process, and the rubber will be greatly damaged. Molecular chain; it may be necessary to increase the screw speed, increase energy consumption, and cause limitations in reuse

At present, there are no relevant patents and documents to solve the problem of desulfurization accuracy. If this difficulty can be solved, the energy consumption of the desulfurization process can be effectively saved, and the breadth of reuse of desulfurization products can be increased.

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