EP0401388A1
Expired / Lapsed
EP
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Modified silicate composition and production of sand mold therefrom
Assignee: Dow Mitsubishi Kasei Ltd
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Filing: 1989-12-19
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Granted: —
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Expires: 2009-12-19
Abstract
Abstract This invention relates to a new modified silicate composition prepared by the reaction of an alkyl silicate or its oligomer with a specified active hydrogen compound in a specified ratio and to a method of producing a sand mold therefrom. More particularly the invention relates to an improvement in the production of a sand mold by using an organic binder and a hardener therefor, and a ceramic binder and a hardener therefor to produce economically a mold having an excellent strength without resort to complicated procedures.
Inventors
- 👤 Hiroaki 14-204 Machida Co-Op Town Katano
- 👤 Tetsuya Aoba-Ryo 5-1 Tsutsujigaoka Tanaka
- 👤 Takayuki 24-14 Yabe 3-Chome Ohta
- 👤 Takeshi 11-14 Ohira 3-Chome Sawai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:35
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/02; B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2273; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3893; C08G18/3895; C08G77/48; C08G77/50
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
120 words
A modified silicate composition obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65 % , with (a) an active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and having one functional group, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 1 to 15, or (b) an active hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
Claim 2
Dependent Claim
120 words
A modified silicate composition obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65 % , with (a) an active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and having one functional group, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 1 to 15, or (b) an active hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
Claim 3
Dependent Claim
58 words
The modified silicate composition according to Claim 1 obtained by reacting the silicate oligomer with the active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and one functional group, at a ratio of the number of the alkoxy groups/the number of active hydrogen atoms within a range of from 1 to 15.
Claim 4
Dependent Claim
55 words
The modified silicate composition according to Claim 1 obtained by reacting the silicate oligomer with the active hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
Claim 5
Independent Claim
207 words
A method for producing a foundry sand mold, which comprises adding and mixing at least an organic binder, a curing agent thereof and a modified silicate-containing polyisocyanate composition to foundry sand, wherein said modified silicate-containing polyisocyanate composition comprises a polyisocyanate and from 1/9 to 9 times by weight thereto of a.modified silicate, and said modified silicate is selected from (a) a product obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65 % , with an active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and one functional group, at a ratio of the number of the alkoxy groups/the number of active hydrogen atoms within a range of from I to 15, or (b) a product obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65%, with an active hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
Claim 6
Independent Claim
207 words
A method for producing a foundry sand mold, which comprises adding and mixing at least an organic binder, a curing agent thereof and a modified silicate-containing polyisocyanate composition to foundry sand, wherein said modified silicate-containing polyisocyanate composition comprises a polyisocyanate and from 1/9 to 9 times by weight thereto of a.modified silicate, and said modified silicate is selected from (a) a product obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65 % , with an active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and one functional group, at a ratio of the number of the alkoxy groups/the number of active hydrogen atoms within a range of from I to 15, or (b) a product obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65%, with an active hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
Claim 7
Dependent Claim
88 words
The method for producing a foundry sand mold according to Claim 4, wherein the modified silicate is a product obtained by reacting the silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65%, with'the active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and one functional group, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 1 to 15.
Claim 8
Dependent Claim
88 words
The method for producing a foundry sand mold according to Claim 4, wherein the modified silicate is a product obtained by reacting the silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65 % , with the hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
Claim 9
Dependent Claim
29 words
The method for producing a foundry sand mold according to Claim 5 or 6, wherein the degree of hydrolysis of the tetraalkoxysilane is from 10 to 60 % .
Claim 10
Dependent Claim
25 words
The method for producing a foundry sand mold according to Claim 7, wherein the degree of hydrolysis of the tetraalkoxysilane is from 40 to 60%.
Claim 11
Dependent Claim
66 words
The method for producing a foundry sand mold according to Claim 5, wherein the active hydrogen-containing compound is selected from a monohydric alcohol having a molecular weight of at least 50 and less than 500, or a polyether alcohol having a molecular weight of at least 80 and less than 500 obtained by adding an alkylene oxide to a monohydric alcohol or a monobasic carboxylic acid.
Claim 12
Dependent Claim
67 words
The method for producing a foundry sand mold according to Claim 6, wherein the active hydrogen-containing compound is selected from a polyether alcohol having a molecular weight of at least 500 obtained by adding an alkylene oxide to an alcohol or a carboxylic acid, or a polyester alcohol having a molecular weight of at least 500 obtained from an alcohol or polyether alcohol and a dicarboxylic acid.
Claim 13
Dependent Claim
41 words
The method for producing a foundry sand mold according to Claim 4, wherein the organic binder is selected from a furfuryl alcohol, a phenol resin, a polyester resin, a urea·furan resin, a phenol-furan resin, a phenol-isocyanate resin, and a polyester-isocyanate resin.
Claim 14
Dependent Claim
35 words
The method for producing a foundry sand mold according to Claim 4 or 11, wherein the organic binder is used in an amount of from 0.2 to 2% based on the weight of the sand.
Claim 15
Dependent Claim
38 words
The method for producing a foundry sand mold according to Claim 4, wherein the curing agent for the organic binder is used in an amount of from 0.2 to 2 % based on the weight of the sand.
Claim 16
Dependent Claim
31 words
The method for producing a foundry sand mold according to Claim 4, wherein the polyisocyanate is selected from diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate and carbodiimide-modified products and prepolymer modified products thereof.
Claim 17
Dependent Claim
31 words
The method for producing a foundry sand mold according to Claim 4, wherein the modified silicate-containing polyisocyanate composition has a weight ratio of the polyisocyanate:the modified silicate = 80:20 to 40:60.
Claim 18
Dependent Claim
48 words
The method for producing a foundry sand mold according to Claim 4, wherein the modified silicate-containing polyisocyanate composition is used in an amount of from 0.1 to 2 % based on the weight of the sand, as the silica content in said composition is calculated as Si0 2'
Claim 19
Dependent Claim
28 words
The method for producing a foundry sand mold according to Claim 4, wherein the organic binder is furfuryl alcohol, and the curing agent thereof is toluene sulfonic acid.
Claim 20
Dependent Claim
28 words
The method for producing a foundry sand mold according to Claim 4, wherein the organic binder is a phenol resin, and the curing agent thereof is a polyisocyanate.
Claim 21
Dependent Claim
172 words
A casting material for a foundry sand mold, which comprises at least foundry sand, an organic binder, a curing agent thereof and a modified silicate-containing polyisocyanate composition, wherein said modified silicate-containing polyisocyanate composition comprises a polyisocyanate and from 1/9 to 9 times by weight thereto of a modified silicate, and said modified silicate is a product obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65 % , with (a) an active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and having one functional group, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 1 to 15, or (b) an active hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
Claim 22
Dependent Claim
172 words
A casting material for a foundry sand mold, which comprises at least foundry sand, an organic binder, a curing agent thereof and a modified silicate-containing polyisocyanate composition, wherein said modified silicate-containing polyisocyanate composition comprises a polyisocyanate and from 1/9 to 9 times by weight thereto of a modified silicate, and said modified silicate is a product obtained by reacting a silicate oligomer obtained by hydrolyzing, dehydrating and polycondensing a tetraalkoxysilane at a degree of hydrolysis within a range of from 0 to 65 % , with (a) an active hydrogen-containing compound having a molecular weight of at least 80 and less than 500 and having one functional group, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 1 to 15, or (b) an active hydrogen-containing compound having a molecular weight of at least 500 and at most 2 functional groups, at a ratio of the number of alkoxy groups/the number of active hydrogen atoms within a range of from 10 to 100.
References Cited (Backward Citations)
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