FIELD: technological processes.
SUBSTANCE: invention relates to the foundry. Binder of self-curing mixtures contains (wt%): liquid glass (60–72), 5 % aqueous solution of borate ethylene glycol (25–35), surfactant (3–5). First, an aqueous solution of ethylene glycol borate is prepared using boric acid and ethylene glycol for this purpose. Liquid glass is mixed with preliminarily prepared 5 % aqueous solution of ethylene glycol borate to density of composition of 1.30–1.34 g/cm3. Introduction of liquid water solution of ethylene glycol borate reduces viscosity of binder and better distribution thereof on filler surface.
EFFECT: higher adhesion and cohesion strength, durability, reduced residual strength and improved knockout of molding and rod mixture.
1 cl, 3 tbl
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Authors
Dates
2019-08-06—Published
2018-11-14—Filed