METHOD FOR PREPARING POLYALKOXYALUMOXANES, SILICA-FREE BINDING AGENT BASED ON THEREOF Russian patent published in 2006 - IPC C07F5/06 

FIELD: chemistry of metalloorganic compounds, chemical technology.

SUBSTANCE: invention relates to the improved method for preparing polyalkoxyalumoxanes of the general formula: RO{[-Al(OR)-O-]_x[-Al(OR*)-O-]_y}_zH wherein z = 3-100; x + y = 1; R*/Al = 0.05-0.95; R means C_nH_2n+1; n = 1-4; R* means -C(CH₃)=CHC(O)C_nH_2n+1; -C(CH₃)=CHC(O)OC_nH_2n+1, and preparing a silica-free binding agent based on thereof for producing refractory corundum ceramics for precise casting by melting out models. Method is carried out by interaction of organoaluminum compound with alcohol and chelating agent in an organic solvent medium wherein compound of the general formula: AlL₃ is used as organoaluminum compound wherein L means C_nH_2n+1, C_nH_2n+1O, (C_nH_2n+1)₂AlO[(C_nH_2n+1)AlO]_t wherein n = 1-4 and t = 2-10 that is subjected for interaction with water, alcohol and chelating agent at temperature 0-250°C wherein compound of the formula R*OH is used as a chelating agent wherein R* means -C(CH₃)=CHC(O)C_nH_2n+1; -C(CH₃)=CHC(O)C_nH_2n+1 in the mole ratio H₂O : ROH : R*OH = p : x : y wherein p = 0.001-1; x = 0.05-0.95; y = 0.05-0.95, and x + y = 1. Also, invention describes a silica-free binding agent based on chelated polyalkoxyalumoxanes in the following ratio of components, wt.-%: chelated polyalkoxyalumoxane, 5-90, and aliphatic alcohol, the balance, up to 100. Invention provides preparing air-stable polyalkoxyalumoxanes and a silica-free binding agent based on thereof, simplifying technology in preparing the corundum composition suspension and fitness period of suspension is prolonged.

EFFECT: improved preparing method, improved and valuable properties of compounds.

3 cl, 3 tbl, 2 ex