High shear stress induced desulfurization and modification method for waste and old tyre rubber

Abstract

The invention relates to high shearing stress induced desulfurization of recycled tyre rubber, and a modified method. Linear high-molecular substances accounting for 5 to 50 percent of the percentage content of the reagent total weight, recycled tyre rubber powder accounting for 49 to 94 percent of the percentage content of the reagent total weight, and stabilization accessory ingredient accounting for 0.01 to 1.8 percent of the percentage content of the reagent total weight are mixed; the mixture is added into a high rotation speed and high shearing type co-rotating twin-screw extruder all together to be molten and extruded to operate the desulfurization reaction; through water cooling, pelleting, and drying or through roll calendering cooling and sheeting out, desulfurization modified regenerated rubber resultant is obtained. The invention integrates the desulfurization reaction, as well as the smelting process, the refining process, and the rubber filtering process into a whole, the efficiency of the desulfurization process is high, the production rate is high, the energy consumption is low, and the macro scale and the large scale are easy; the desulfurization reaction is easy to be controlled; the pollution of the reaction process to environment is small, and the mechanical property of the resulfurized material of the desulfurization resultant is good.

Description

Technical field: [0001] The invention relates to a new technology for desulfurization and regeneration of waste tire rubber, which belongs to the field of modification of polymer materials. technical background: [0002] With the continuous development of the world economy and science and technology, rubber materials have increasingly become an important material that people cannot do without. According to the statistics of the International Rubber Research Group (IRSG), the global rubber consumption reached 18.97 million tons in 2003 and 19.3 million tons in 2004, an increase of about 5% year-on-year. It is expected to reach 26 million tons in 2020. my country is a big country in the rubber industry. The average annual consumption of raw rubber has increased by more than 10%. It was 3.64 million tons in 2003, 4.2 million tons in 2004, and 5.4 million tons in 2006. Rubber consumer country and the largest rubber importer. According to the forecast of the International Rubbe...

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Problems solved by technology

However, these methods have technical problems such as long process flow, high energy consumption in production, high labor intensity of operators, or a large amount of waste water or waste gas generated during the desulfurization process, which is difficult to process, pollutes the environment, and has poor quality of reclaimed rubber products. Abroad has been basically abandoned

At present, my country still mainly produces reclaimed rubber by high-temperature, high-pressure dynamic desulfurization method. Although it is improved compared with the general water-oil method and oil method, it still inevitably produces a large amount of waste water and waste gas, which seriously pollutes and destroys the environment around the factory. ecology and environment

And microwave desulfurization method, ultrasonic desulfurization method, microbial technology desulfurization method and supercritical CO 2 Modern technologies such as swelling desulfurization method are still in the process of research and development due to technical problems such as the need to shield radiation, difficulty in amplification, or high energy consumption, and difficulty in large-scale industrial implementation.

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