Such a conclusion has been made by specialists of the Republican State Enterprise “National Center for Mineral Raw Materials Complex Recycling of Republic of Kazakhstan” with participation of their colleagues from the A.V. Topchiev Institute of Petrochemical Synthesis (Russian Academy of Sciences).
Contemporary production of rubber and other plastic materials uses filling agents, which improve properties of the material. Among others, technical carbon or carbon white (hydrated silicon o?ide) are used as filling agents for rubber. Recent years witnessed significant raise of interest to creating composite materials with filling agents made of carbonic and siliceous nanostructures. A rather promising source of raw materials for their receiving is large-tonnage waste of rice production – rice husk, which includes polysacharides, lignine, neutral and tarry matter and silicon dioxide. High-clean silicon dioxide, silicon carbide and silicon are already produced from rice husk. Now, it is time to get a nanostructural silicocarbonous material.
To make a filling agent from rice husk, the raw material is to be carbonized, i.e., the carbon content should be increased in it. When selecting optimal conditions, the researchers exposed rice husk to thermal decomposition in the temperature interval of 450 to 1,000ºC at the heating rate of 15 to 20ºC per minute in the atmosphere of outlet gases, controlling the output and content of obtained solid products. As temperature increases, the silicocarbonous material output decreases, the organic carbon content remains practically constant, and the silicon dioxide content rises. Tests have shown that it is better to process rice husk at the temperature of 650ºC. Under these conditions, nanodimensional particles of amorphous carbon and silicon dioxide are received, which are easily distributed in the caoutchouc matrix and improve rubber compound’s processing characteristics, including durability and plasticity. Tire rubber and general mechanical rubber goods with application of carbonizers from rice husk and its derivatives as a filling agent exceed by quality analogous products manufactured with technical carbon or carbon white. Besides, new silicocarbonous filling agents (due to higher content of hydrocarbon phases) enable to reduce plasticizer consumption or to do without it at all.
The obtained results allow to consider carbonizers from rice husk and its derivatives as promising nanostructural filling agents for elastomers.
Olga Myznikova | alfa
Energy crop production on conservation lands may not boost greenhouse gases
13.03.2017 | Penn State
How nature creates forest diversity
07.03.2017 | International Institute for Applied Systems Analysis (IIASA)
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
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27.03.2017 | Life Sciences