Title:
COMPOSITION OF SAND FOR FORMING MOLD
Document Type and Number:
Japanese Patent JP3189911
Kind Code:
B2
Abstract:
PURPOSE: To provide the composition of sand for forming a mold capable of manufacturing a casting scarce in gas defect.
CONSTITUTION: This sand composition for forming the mold is composed of reconditioned sand, binder consisting of acid hardening furan resin and phosphorus compound as hardening catalyst for the acid hardening furan resin. As the reconditioned sand, the one satisfying the following two essential condition. That is, (1) the difference between an ignition loss ratio of the reconditioned sand and the ignition loss ratio of the new sand is to be ≤4.0wt.%, (2) the phosphorus content in the reconditioned sand is to be 0.008-0.55wt.% and/or the nitrogen content is to be 0.004-0.22wt.%. Further, as the phosphorus compound, one or more kinds of the compounds selected from group composed of phosphoric acid, condensed phosphoric acid, phosphoric ester and phosphate is used.
Inventors:
Kazuhiko Kiuchi
Shigeo Nakai
Tsutomu Tanaka
Masayuki Kato
Shigeo Nakai
Tsutomu Tanaka
Masayuki Kato
Application Number:
JP22068092A
Publication Date:
July 16, 2001
Filing Date:
July 27, 1992
Export Citation:
Assignee:
Kao Corporation
International Classes:
B22C1/00; B22C1/22; (IPC1-7): B22C1/22
Domestic Patent References:
| JP5945057A | ||||
| JP5722842A | ||||
| JP6037240A | ||||
| JP5853344A | ||||
| JP5758948A |
Attorney, Agent or Firm:
Shigeki Okumura
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