POLYURETHANE-BASED BINDER FOR OBTAINING RODS AND CAST MOULDS WITH APPLICATION OF ISOCYANATES, CONTAINING URETONIMINE AND/OR CARBODIIMIDE GROUP, MIXTURE OF MOULDING MATERIALS, CONTAINING SAID BINDER, AND METHOD FOR APPLICATION OF SAID BINDER Russian patent published in 2016 - IPC C08G18/54 C08G18/18 C08G18/79 C08K3/34 B22C1/22 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to polyurethane-based binder with application of isocyanates, which contain uretonimine and/or carbodiimide groups for obtaining rods and cast moulds, to mixture of moulding materials, containing binder, and to method for application of binder for obtaining cast moulds. Described is binder for mixtures of moulding materials, which contains: (A) one or several polyol compounds, containing at least 2 hydroxy groups per molecule, including at least one phenolic resin as polyol compound; and (B) one or several isocyanate compounds, containing at least 2 isocyanate groups per molecule, including at least one isocyanate compound at least with 2 isocyanate groups per molecule, additionally containing at least one uretonimine group and/or carbodiimine group per molecule. Also described are: mixture of moulding materials, containing said binder and main heat-resistant material for moulds, and method for obtaining moulded product in form of cast moulds or in form of rod, including stages at which: (i) main heat-resistant materials for moulds are mixed with said binder; (ii) mixture of moulding materials or its ingredients are introduced into press mould; (iii) mixture of moulding materials is cured in press mould to obtain integral mould; and (iv) then cured mould is separated from press mould and optionally additionally cured, thus obtaining cured moulded product.

EFFECT: provision of mixture of moulding materials, which makes it possible to obtain moulded products for foundry industry with lower emissions into the environment.

22 cl, 5 tbl, 16 ex