On the 19th, the Japanese researchers announced that they have discovered sea mud with a high concentration of rare earths on the seabed in the eastern part of the Indian Ocean. This is the first time that a sea-mud containing rare earths has been discovered outside the Pacific Ocean, which proves that rare earths may be widely distributed in the global ocean.
Rare earths are an indispensable resource in high-tech materials. The discovery of the rare earth was located in the Indian Ocean, about 1,000 kilometers west of Jakarta, Indonesia, not far from Cocos Islands, which belongs to Australia.
Compared to the Pacific Ocean, the location of rare earths in this location is deeper and mining is more difficult. Its rare earth concentration is similar to that of the Pacific Ocean and is several times that of China's terrestrial deposits. In particular, rare earth and other rare earth elements are very abundant.
The researchers believe that iron oxides and other substances emitted from the central ridge will absorb rare earths in seawater and accumulate in the vicinity. The discovery of rare earths is due to the activities of the central Indian Ridge. The sea ridge, also known as the seamounts, is located on the ridge of the central part of the ocean and is called the central ridge.
The researchers pointed out: "This shows that the rare earth-bearing sea mud is not unique to the Pacific and is of great significance. Other sea areas may also discover rare earth deposits that can be developed."
Reaction type phenolic antioxidant is the use of reactive groups will be phenolic antioxidant molecules to the polymer backbone, therefore, has good compatibility with polymer taking resistance and not easy to migrate, volatile and environmental advantages, can keep the antioxidant effect of unsaturated isocyanate or direct addition controllable isocyanation method can produce appropriate reaction type molecular weight antioxidants. At present, reactive phenolic antioxidants have gradually become a hot topic in the field of polymer polymer.The development trend of phenolic antioxidants is to increase the molecular weight of antioxidants, reduce volatility, improve antioxidant efficiency and reduce toxicity, making them more suitable for processing and using at higher temperatures. The development and production of asymmetric phenolic antioxidants represent a major trend in the field of polymer antioxidants in the world today. It has broad prospects in the application of high-performance plastic products. Reactive and polymeric phenolic antioxidants are also very active. Reactive phenolic antioxidants are bonded to the protected polymer chains because they contain reactive groups in polymer thermal processing or polymerization. Polymeric phenolic antioxidants are obtained by homopolymerization or copolymerization by monomers with blocked phenolic units. These two kinds of new phenolic antioxidants also represent an important research direction of antioxidant.
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