IP Library › Granted Patent US 12667884
Granted Patent B2
US 12667884 · App. 18/282,536 · Granted Jun 30, 2026

Sand mold-forming additive, sand mold-forming composition, sand mold manufacturing method, and sand mold

Inventors: Yusuke Kato (Nagoya, JP); Toshihiko Zenpo (Nagoya, JP); Tomohiro Aoki (Nagoya, JP); Shumma Sato (Gamagori, JP)
Assignees: SINTOKOGIO, LTD.; TAKEMOTO YUSHI KABUSHIKI KAISHA
B22C1/02B22C1/188B22C9/02
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Quick Facts
Patent No.
US 12667884
App. No.
18/282,536
Granted
Jun 30, 2026
Kind
B2
Abstract

A sand mold-forming additive capable of making a sand mold-forming composition having excellent forming property and a sand mold having excellent moisture resistance is provided. The sand mold-forming additive contains 0.01-2.00 parts by weight of an inorganic alkali metal compound (B) per 100 parts by weight of anionic surfactant (A). The inorganic alkali metal compound (B) is at least one selected from sodium chloride and sodium sulfate. The ionic surfactant (A) is preferably at least one selected from alkyl sulfonic acid metal salts (A1), alkyl sulfuric acid metal salts (A2), and polyoxyalkylene alkyl ether sulfuric acid ester metal salts (A3).

Claims (29)

1 . A sand mold-forming additive, comprising:

0.01-2.00 parts by weight of an inorganic alkali metal compound (B) per 100 parts by weight of an ionic surfactant (A);

wherein the ionic surfactant (A) comprises an alkyl sulfonic acid metal salt (A1), an alkyl sulfuric acid metal salt (A2), and a polyoxyalkylene alkyl ether sulfuric acid ester metal salt (A3);

wherein the alkyl sulfonic acid metal salt (A1) comprises an alkyl sulfonic acid metal salt having a C8-C22 alkyl group;

wherein the alkyl sulfuric acid metal salt (A2) comprises an alkyl sulfuric acid metal salt having a C8-C22 alkyl group;

wherein the polyoxyalkylene alkyl ether sulfuric acid ester metal salt (A3) comprises a polvoxyalkylene alkyl ether sulfuric acid ester metal salt having a C8-C16 alkyl group;

wherein the inorganic alkali metal compound (B) comprises at least one selected from sodium chloride and sodium sulfate; and

wherein the alkyl sulfonic acid metal salt (A1) is 50-98 parts by weight, the alkyl sulfuric acid metal salt (A2) is 1-40 parts by weight, and the polyoxyalkylene alkyl ether sulfuric acid ester metal salt (A3) is 1-40 parts by weight, per 100 parts by weight of total content of the alkyl sulfonic acid metal salt (A1), the alkyl sulfuric acid metal salt (A2), and the polyoxyalkylene alkyl ether sulfuric acid ester metal salt (A3).

2 . The sand mold-forming additive according to claim 1 , further comprising a lithium compound (C) comprising at least one selected from lithium silicate, lithium sulfate and lithium hydroxide.

3 . The sand mold-forming additive according to claim 2 , wherein the lithium compound (C) comprises lithium silicate, and at least one selected from lithium sulfate and lithium hydroxide.

4 . The sand mold-forming additive according to claim 2 , wherein the lithium compound (C) is 10-2,000 parts by weight per 100 parts by weight of the ionic surfactant (A).

5 . The sand mold-forming additive according to claim 2 , wherein the lithium compound (C) comprises lithium silicate; and

wherein a molar ratio (SiO 2 /Li 2 O) of the lithium silicate is 3.0-5.0.

6 . A sand mold-forming composition, comprising the sand mold-forming additive according to claim 4 , sand, and a silicate compound (D) comprising at least one selected from sodium silicate and potassium silicate.

7 . The sand mold-forming composition according to claim 6 , wherein the sand mold-forming additive is 2-100 parts by weight per 100 parts by weight of the silicate compound (D).

8 . A method of manufacturing a sand mold, comprising:

a step A of molding the sand mold-forming composition according to claim 6 .

9 . The method of manufacturing the sand mold according to claim 8 , wherein the step A comprises:

a step A1 of stirring and foaming the sand mold-forming composition according to claim 6 ;

a step A2 of filling the foamed sand mold-forming composition into a mold making space; and

a step A3 of solidifying the filled sand mold-forming composition.

10 . A method of manufacturing a sand mold, comprising:

a step B1 of adding a silicate compound (D) to the sand mold-forming additive according to claim 1 , stirring and foaming the mixture, and then adding sand to the mixture;

a step B2 of filling the prepared sand mold-forming composition into a mold making space; and

a step B3 of solidifying the filled sand mold-forming composition.

11 . A sand mold, comprising the sand mold-forming additive according to claim 1 , a silicate compound (D), and sand wherein the silicate compound (D) comprises at least one selected from sodium silicate and potassium silicate.

12 . The sand mold-forming additive according to claim 1 , wherein the alkyl sulfonic acid metal salt (A1) comprises a sodium alkyl sulfonate having a C14-C18 alkyl group, or a sodium alkyl sulfonate having a C8-C14 alkyl group.

13 . The sand mold-forming additive according to claim 1 , wherein the alkyl sulfuric acid metal salt (A2) comprises a sodium alkyl sulfate having a C8-C10 alkyl group, a sodium alkyl sulfate having a C10-C14 alkyl group, or a sodium alkyl sulfate having a C14-C18 alkyl group.

14 . The sand mold-forming additive according to claim 1 , wherein the polyoxyalkylene alkyl ether sulfuric acid ester metal salt (A3) comprises a sodium polyoxyethylene alkyl ether sulfate which has a C12-C14 alkyl group and in which a number of moles of ethylene oxide is 3-4, or a sodium polyoxyethylene alkyl ether sulfate which has a C10-C12 alkyl group and in which a number of moles of ethylene oxide is 3-4.