Hydraulic composition for additive manufacturing device and method of manufacturing casting mold

Patent metadata

Field	Value
Publication number	US-11173539-B2
Application number	US-201816629764-A
Country	US
Kind code	B2
Filing date	Jul 30, 2018
Priority date	Jul 31, 2017
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

Abstract

A hydraulic composition for an additive manufacturing device has an excellent initial flexural strength development property and dimensional stability. The hydraulic composition includes 1.5 to 14 parts by mass of a polymer with respect to 100 parts by mass of an inorganic binder. In addition, in a hydraulic composition for an additive manufacturing device, the inorganic binder may contain 50 to 100 mass % of a calcium aluminate with respect to 100 mass % of the entire inorganic binder, and in a hydraulic composition for an additive manufacturing device the inorganic binder, may contain 0 to 50 mass % of rapid hardening cement with respect to 100 mass % of the entire inorganic binder.

First claim

The invention claimed is:

1. A hydraulic composition for an additive manufacturing device, comprising:
1.5 to 14 parts by mass of a partially saponified polyvinyl alcohol having an average particle diameter of 150 μm or less with respect to 100 parts by mass of an inorganic binder.

2. The hydraulic composition for an additive manufacturing device according to claim 1 , wherein the inorganic binder contains 50 to 100 mass % of a calcium aluminate with respect to 100 mass % of the entire inorganic binder.

3. The hydraulic composition for an additive manufacturing device according to claim 1 , wherein the inorganic binder contains 0 to 50 mass % of rapid hardening cement with respect to 100 mass % of the entire inorganic binder.

4. The hydraulic composition for an additive manufacturing device according to claim 1 , wherein the polymer polyvinyl alcohol is a polyvinyl alcohol that has been pulverized simultaneously with the inorganic binder.

5. The hydraulic composition for an additive manufacturing device according to claim 1 , wherein the inorganic binder contains 0 to 50 mass % of cement of which setting initial time measured according to JIS R 5210 is within 3.5 hours with respect to 100 mass % of the entire inorganic binder.

6. The hydraulic composition for an additive manufacturing device according to claim 2 , wherein the inorganic binder contains 0 to 50 mass % of cement of which setting initial time measured according to JIS R 5210 is within 3.5 hours with respect to 100 mass % of the entire inorganic binder.

7. The hydraulic composition for an additive manufacturing device according to claim 1 , further comprising:
28 to 100 parts by mass of water with respect to a total of 100 parts by mass of the inorganic binder and the polyvinyl alcohol; and
sand.

8. The hydraulic composition for an additive manufacturing device according to claim 2 , further comprising:
28 to 100 parts by mass of water with respect to a total of 100 parts by mass of the inorganic binder and the polyvinyl alcohol; and
sand.

9. The hydraulic composition for an additive manufacturing device according to claim 6 , further comprising:
28 to 100 parts by mass of water with respect to a total of 100 parts by mass of the inorganic binder and the polyvinyl alcohol; and
sand.

10. The hydraulic composition for an additive manufacturing device according to claim 2 , wherein the inorganic binder contains 0 to 50 mass % of rapid hardening cement with respect to 100 mass % of the entire inorganic binder.

11. The hydraulic composition for an additive manufacturing device according to claim 10 , further comprising:
28 to 100 parts by mass of water with respect to a total of 100 parts by mass of the inorganic binder and the polyvinyl alcohol; and
sand.

12. A molded article using the hydraulic composition for an additive manufacturing device according to claim 7 , wherein an ignition loss of the molded article at a material age of 3 days is 6.5 mass % or less.

13. A method of manufacturing a casting mold, comprising molding a casting mold using an additive manufacturing device and the hydraulic composition for an additive manufacturing device according to claim 7 .

14. The method of manufacturing a casting mold according to claim 13 , wherein a curing temperature of the casting mold is 10° C. to 100° C.

Assignees

• Taiheiyo Cement Corp

Inventors

• OHGI Yoshifumi
• Ogawa Yoji
• Ishii Yusuke
• Nakazaki Takeshi
• Naka Shinya

Classifications

• B22C1/18 Primary

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

• C04B2111/00181

  Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping · CPC title

• C04B24/26

  obtained by reactions only involving carbon-to-carbon unsaturated bonds {(C04B24/243 takes precedence)} · CPC title

• B22C1/20

  of organic agents · CPC title

• C04B28/06

  Aluminous cements (monolithic refractories or refractory mortars C04B35/66) · CPC title