发明名称 |
MODIFIED SILICATE COMPOSITION AND PRODUCTION OF SAND MOLD THEREFROM. |
摘要 |
<p>A new modified silicate compsn. is produced by reacting a silicate oligomer (1) with an active hydrogen cpd. (a) or (b). (1) is obtd. by hydrolysis-dehydration-condensn. polymerisation of tetraalkoxy silane using a hydrolysis coefft. of 0-65% (pref. 10-60%, esp. 40-60%). (a) has a mol. wt. between 80 and 500 and contains one functional gp. (b) has a mol. wt. of 500 or higher and has one or two functional gps.. The reaction is carried out with the ratio of the no. of alkoxy gps. to the no. of active H being 1-15 when (a) is the active H cpd. and 10-100 when (b) is the active H cpd.. A sand mould is produced by adding to moulding sand at least an organic binder, a hardener, and an isocyanate compsn. contg. this modified silicate compsn.. The isocyanate compsn. comprises a polyisocyanate and the modified silicate compsn. (1/9-9 times the wt. of polycyanate). The active H cpd. is a polyether or polyester alcohol. The organic binder is phenol resin, polyester resin, urea furan resin, phenol-furan resin, phenol-isocyanate resin or polyester-isocyanate resin.</p> |
申请公布号 |
EP0401388(A1) |
申请公布日期 |
1990.12.12 |
申请号 |
EP19900901010 |
申请日期 |
1989.12.19 |
申请人 |
MITSUBISHI KASEI CORPORATION;DOW MITSUBISHI KASEI LIMITED |
发明人 |
KATANO, HIROAKI 14-204 MACHIDA CO-OP TOWN;TANAKA, TETSUYA AOBA-RYO 5-1, TSUTSUJIGAOKA;OHTA, TAKAYUKI 24-14, YABE 3-CHOME;SAWAI, TAKESHI 11-14, OHIRA 3-CHOME |
分类号 |
B22C1/22;C08G18/38;C08G77/02;C08G77/50 |
主分类号 |
B22C1/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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