ADHESIVE COMPOSITION FOR GLUING OF MOLDS AND CORES Russian patent published in 2003 - IPC

FIELD: foundry. SUBSTANCE: adhesive composition contains, wt.%: liquid technical lignosulfonates 5.5-8.5; dustlike quartz 34.0-47.0; hardening activator in form of magnesium- aluminophosphate binding agent with modifying additive 27.0-30.0; and additionally binder M-3 20.5-27.5. Interaction between binder M-3 and modified magnesium-aluminophosphate binding agent results in polymerization reaction due to formation of methylene and ester bridges between neighboring molecules. Binder changes to thermoactive state with exothermic effect. In presence of heat, liquid technical lignosulfonate, being oligomers, are condensed. 1,1- dicililcyclotrisiloxane contained in binding agent plays a part of plasticizer in polymerization reaction. EFFECT: higher efficiency of use of claimed adhesive composition due to its needed ductility and property preventing cracking of gluing seam in contact with molten metal. 2 cl, 1 tbl