A new method for preparing carbon nanotubes invented by Changchun Yinghua Institute of Chinese Academy of Sciences Flame retardant properties and high value recycling of waste polymers have opened up new ways. According to reports, carbon nanotubes are an important nanomaterial. Because of their excellent electrical conductivity, extremely high mechanical strength, hydrogen storage capacity, adsorption capacity, and strong microwave absorption capacity, they have been subjected to physical, chemical and material sciences. The world and the high-tech industry sector attach great importance. At present, the main preparation methods of carbon nanotubes are arc method, laser ablation method and vapor deposition method. With the wide application of polymer materials, the effective conversion of polymers into carbon materials has important value in the field of high technology and polymer flame retardancy. At the same time, the "white pollution" problem caused by the increasing volume of waste plastic products poses a serious threat to the environment. Existing waste plastic recycling methods include landfill, incineration, physical and chemical recycling, etc. The preparation method of the carbon nanotube material invented by the research group of Tang Tao is to combine the high-efficiency carbonization technology of the polymer with the preparation technology of the nanocarbon material, while synthesizing the high value-added carbon nanotube material, it can also be recovered at a high value Waste polyolefin. It uses polyolefin or recycled polyolefin as the carbon source material, adds a combined catalyst composed of organically modified montmorillonite and supported metal catalyst, and melts and mixes it in the internal mixer and twin-screw extruder, and the resulting mixed material is combusted. Method of preparing carbon nanotubes. This method is easy to implement. At present, the invention technology has been preliminarily enlarged and can be used for laboratory batch synthesis of carbon nanotubes, which provides a new idea for the high-value recovery and reuse of waste polymers. At the same time, the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences also reported for the first time in the world the scientific research results of polyolefin synthesis of multi-walled carbon nanotubes under the combined catalytic action of solid acid and carbon-forming catalyst. In the subsequent research work, the research group used different solid acid catalysts that catalyze the degradation of polyolefins and catalysts for the synthesis of carbon nanotubes to optimize the process conditions of the synthesis reaction and achieve higher yields of carbon nanotubes and hydrogen energy. Preparation, carbon nanotube materials with different characteristics can also be prepared according to needs. In addition, the mechanism and key control factors of the combination of solid acid and carbon-forming catalyst to catalyze the synthesis of carbon nanotubes and hydrogen by polyolefin are also theoretically elucidated. At the same time, the research team also found that the use of the above combined catalytic technology can improve the flame retardant performance of polyolefins. The invention-related technology now has 6 Chinese authorized invention patents, 1 US authorized invention patent, and 2 patent applications.
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