Binder composition for molding, blended aggregate for molding, and mold

Patent metadata

Field	Value
Publication number	US-10668524-B2
Application number	US-201716089497-A
Country	US
Kind code	B2
Filing date	Feb 14, 2017
Priority date	Jun 6, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

To provide a binder composition for molding, by which a mold made of aggregate has an excellent resistance to moisture. The binder composition for molding contains a water-soluble binder and at least one kind of lithium salt that is selected from a group of lithium silicate, lithium oxide, lithium hydroxide, lithium carbonate, lithium bromide, lithium chloride, lithium nitrate, and lithium nitrite.

First claim

The invention claimed is:

1. A binder composition for molding containing:
a water-soluble binder;
lithium silicate, wherein a mole ratio of the lithium silicate at SiO 2 /Li 2 O equals 3.0 or more and 8.0 or less; and
a water-soluble foaming agent.

2. The binder composition for molding of claim 1 , wherein a mole ratio of the lithium silicate at SiO 2 /Li 2 O equals 3.0 or more and 5.0 or less.

3. The binder composition for molding of claim 1 , containing at least one kind of the water-soluble binder that is selected from a group of sodium silicate and potassium silicate.

4. The binder composition for molding of claim 1 , containing a surfactant as the water-soluble foaming agent.

5. The binder composition for molding of claim 4 , containing at least one kind of the surfactant that is selected from a group of an anionic surfactant, a non-ionic surfactant, and an amphoteric surfactant.

6. Blended and foamed aggregate for molding containing:
aggregate;
a water-soluble binder;
lithium silicate, wherein a mole ratio of the lithium silicate at SiO 2 /Li 2 O equals 3.0 or more and 8.0 or less; and
a water-soluble foaming agent.

7. The blended and foamed aggregate for molding of claim 6 , wherein a mole ratio of the lithium silicate at SiO 2 /Li 2 O equals 3.0 or more and 5.0 or less.

8. The blended and foamed aggregate for molding of claim 6 , containing at least one kind of the water-soluble binder that is selected from a group of sodium silicate and potassium silicate.

9. The blended and foamed aggregate for molding of claim 6 , containing a surfactant as the water-soluble foaming agent.

10. The blended and foamed aggregate for molding of claim 9 , containing at least one kind of the surfactant that is selected from a group of an anionic surfactant, a non-ionic surfactant, and an amphoteric surfactant.

11. The blended and foamed aggregate for molding of claim 6 , wherein a content of the lithium silicate equals 0.01 mass % or more and 1 mass % or less in comparison to a content of the aggregate.

12. The blended and foamed aggregate for molding of claim 6 , wherein a content of the water-soluble binder equals 0.1 mass % or more and 20 mass % or less in comparison to a content of the aggregate.

13. The blended and foamed aggregate for molding of claim 6 , wherein a content of the foaming agent equals 0.005 mass % or more and 0.1 mass % or less in comparison to a content of the aggregate.

14. The blended and foamed aggregate for molding of claim 6 , including bubbles that are generated by foaming and having a viscosity that equals 0.5 Pa·S or more and 10 Pa·S or less.

15. A method for manufacturing a mold made of aggregate that comprises,
aggregate;
a water-soluble binder;
lithium silicate, wherein a mole ratio of the lithium silicate at SiO 2 /Li 2 O equals 3.0 or more and 8.0 or less; and
a water-soluble foaming agent; the method comprising the steps of:
mixing and agitating the aggregate, the water-soluble binder, the lithium silicate, and the water-soluble foaming agent, to foam them, and
filling the foamed and blended aggregate into a cavity for manufacturing a casting mold.

Assignees

• Sintokogio Ltd

Inventors

• Aoki Tomohiro
• Kato Yusuke

Classifications

• B22C1/18 Primary

  of inorganic agents {(B22C1/162 takes precedence)} · CPC title

• B22C1/10

  for influencing the hardening tendency of the mould material (influencing the hardening tendency of the binding agent only B22C1/16) · CPC title

• C04B12/04

  Alkali metal or ammonium silicate cements {; Alkyl silicate cements; Silica sol cements; Soluble silicate cements (alkali metal silicates per se, their preparation C01B33/32; ammonium silicates per se, their preparation C01C1/00)} · CPC title

• B22C1/188 Primary

  Alkali metal silicates · CPC title

• B22C9/02

  Sand moulds or like moulds for shaped castings · CPC title