METHOD OF SYNTHESIS OF CARBAMIDOFURAN BINDER FOR COLD-HARDENING SAND-RESIN MIXTURES Russian patent published in 1995 - IPC

Abstract RU 2048950 C1

FIELD: casting manufacture. SUBSTANCE: carbamidofuran binder is synthesized by two-stage condensation of carbamide, formaldehyde and furfuryl alcohol. At the first stage condensation of carbamide and formaldehyde is carried out firstly in alkaline and then in acid medium; at the second stage of condensation tetrahydrofuran is added together with furfuryl alcohol at concentration 1.5-3.0 wt.-% of furfuryl alcohol level. EFFECT: decreased hygroscopicity of rods and forms, prevention of their weakening at increased relative air humidity. 2 tbl

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RU 2 048 950 C1

Authors

Olejnikov V.E.

Zjazin B.M.

Kudinov V.K.

Prozorin S.I.

Tepljakov S.D.

Dates

1995-11-27Published

1993-08-30Filed