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公开(公告)号：EP3835264A1
公开(公告)日：2021-06-16
申请号：EP19846705.2
申请日：2019-08-07
发明人： GORDON, Elena Petrovna , KOROTCHENKO, Alla Vitalievna , LEVCHENKO, Nadezhda Illarionovna , SIZYKH, Igor Nikolaevich , UGNOVENOK, Tatiana Sergeevna
摘要： The invention is referred to chemical technology, namely to active high-purity magnesium oxide and its production method.
Active high-purity magnesium oxide, including the surface treated one, has BET specific surface area from 70 to 200 m 2 /g, average particle size (d50) determined by laser diffraction method not more than 10 microns, iodine activity in the range from 70 to 200 mg J/g MgO, citric activity not more than 40 s, pore volume in the range from 3.2 × 10 -2 cm 3 /g to 10.2 × 10 -2 cm 3 /g, diameter of 10% of the particles not more than 2 microns, diameter of 90% of the particles not more than 30 microns, mass fraction of residue on the 150 micron sieve not more than 1%, mass fraction of residue on the 45 micron sieve not more than 2%, mass fraction of chlorides not more than 0.1%, mass fraction of calcium not more than 0.1 %, mass fraction of substances insoluble in hydrochloric acid not more than 0.05 %, mass fraction of iron not more than 0.005 %, mass fraction of impurities of each of Ti, Co, Mo, V, Sb, Ba cations not more than 1 ppm, Pb, Cd, As, Hg not more than 0,1 ppm.
Method for the production of active high-purity magnesium oxide including the surface treated one consists of calcination of magnesium hydroxide obtained by interaction of magnesium salt solution with alkaline agent. Magnesium hydroxide crystals are produced by continuous method in divided and isolated between each other zones in the presence of seed crystals of magnesium hydroxide and liquid oil products with mole ratio of ions of alkaline agent and magnesium chloride OH - /Mg ++ within the range (1,9÷2,1) : 1, with the temperature in all zones not less than 40 °C and magnesium hydroxide crystals suspension residence time in each isolated zone not less than 20 minutes.
Active high-purity magnesium oxide produced by this method has high activity and high chemical purity that allows to use it as a filler for rubbers, adhesives, plastics, polymers, as stabilizers in production of chloroprene rubbers, refining additives of organic solvents, in production of catalysts, special ceramics, special glass, in pharmaceutical, pharmacopoeial and food industries, in production of magnesia cement and other magnesium-containing materials.-
2.发明授权
公开(公告)号：EP2998273B1
公开(公告)日：2018-03-28
申请号：EP14858993.0
申请日：2014-10-06
发明人： GORDON, Elena Petrovna , KOROTCHENKO, Alla Vitalievna , LEVCHENKO, Nadezhda Illarionovna , UGNOVENOK, Tatiana Sergeevna
CPC分类号： C09K21/02 , C01F5/14 , C01F5/22 , C01P2004/03 , C01P2004/24 , C01P2004/51 , C01P2004/54 , C01P2004/60 , C01P2004/61 , C01P2006/12 , C01P2006/14 , C01P2006/19 , C08K3/22 , C08K7/00 , C08K2003/2217 , C08K2003/2224 , C08K2201/003 , C08K2201/004 , C08K2201/006 , C08K2201/011 , C08L23/12
摘要： The invention relates to chemical technologies, specifically nanoparticles of flame retardant magnesium hydroxide, and a process for the preparation thereof. The present nanoparticles of flame retardant magnesium hydroxide, including surface-processed nanoparticles, have a hexagonal plate-like structure with a specific surface area of up to 20 m 2 /g, an average diameter of the secondary particles of up to 2 µm, a diameter of 10 % of the secondary particles of up to 0.8 µm, a diameter of 90 % of the secondary particles of up to 5 µm, with a longitudinal size of the primary particles of from 150 to 900 nm, and a thickness of from 15 to 150 nm. The present process for the preparation of nanoparticles of flame retardant magnesium hydroxide, including surface-processed nanoparticles, consists of two steps, wherein the first step consists in interacting an aqueous solution of magnesium chloride with an alkali component at a temperature of up to 100 °C and atmospheric pressure, with a molar ion ratio OH - : Mg ++ in the range of 1,9÷2,1 : 1, and the second step consists in hydrothermal recrystallization of the magnesium hydroxide particles at a temperature of 120 - 220 °C, a pressure of from 0.18 to 2.3 MPa and a duration of from 2 to 24 h, wherein, during hydrothermal recrystallization, in order to prevent the further growth of primary particles and the coarsening of the secondary particles by aggregation, the reaction mass is subjected to periodic hydraulic impacts with superheated vapour at a temperature of 160 - 240 °C and a pressure of from 0.6 to 3.3 MPa. The nanoparticles of flame retardant magnesium hydroxide, obtained according to the present process, have controllable sizes of the primary and secondary particles and a specific surface area, which allows using them as smoke-suppressing, non-toxic flame retardant without a reduction in mechanical properties and technological effectiveness in organic polymeric matrices comprising polyethylene, polypropylene, ethylene propylene copolymer, ethylene acrylate copolymer, polystyrene, ethylene-co-vinylacetate based polymer, polyamide, polyimide, polycarbonate, polyethyleneterephthalate, polybutyleneterephthalate, ABS plastic.
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