Certain-shaped joint material for hot installation

Patent metadata

Field	Value
Publication number	US-11925980-B2
Application number	US-201917282059-A
Country	US
Kind code	B2
Filing date	Sep 25, 2019
Priority date	Oct 5, 2018
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

It is intended to suppress flaming and smoking due to combustion of combustible substances in a certain-shaped joint material, while maintaining hot sealability of the certain-shaped joint material. A certain-shaped joint material for hot installation is obtained by: adding organic additives to a blend in a combined amount of 26 mass % to 50 mass %, with respect to and in addition to 100 mass % of the blend, wherein the blend comprises 50 mass % to 90 mass % of gibbsite type aluminum hydroxide raw material, 1 mass % to 9 mass % of clay, and 9 mass % to 23 mass % of graphite, with the remainder mainly composed of an additional refractory raw material; and subjecting the resulting mixture to kneading, forming and drying.

First claim

The invention claimed is:

1. A certain-shaped joint material for hot installation, which is obtained by: adding organic additives to a blend in a combined amount of 26 mass % to 50 mass %, with respect to and in addition to 100 mass % of the blend, wherein the blend comprises 50 mass % to 90 mass % of gibbsite type aluminum hydroxide raw material, 1 mass % to 9 mass % of clay, and 9 mass % to 23 mass % of graphite, with the remainder mainly composed of an additional refractory raw material; and subjecting the resulting mixture to kneading, forming and drying.

2. The certain-shaped joint material as recited in claim 1 , wherein the aluminum hydroxide raw material has a particle size of 1 μm to 0.25 mm.

3. The certain-shaped joint material as recited in claim 1 , wherein the additional refractory raw material in the remainder of the blend is one or more selected from the group consisting of an alumina raw material, a spinel raw material, a zircon raw material, a zirconia raw material, a magnesia raw material, and a silica raw material.

4. The certain-shaped joint material as recited in claim 1 , wherein the graphite is flaky graphite having a particle size of 0.2 mm or more.

5. The certain-shaped joint material as recited in claim 1 , wherein the organic additives comprise a binder and a plasticizer, wherein the binder and the plasticizer are added, respectively, in an amount of 25 mass % to 45 mass % and in an amount of 1 mass % to 5 mass %, with respect to and in addition to 100 mass % of the blend.

6. The certain-shaped joint material as recited in claim 5 , wherein the binder is an ethylene vinyl acetate-based emulsion whose resin concentration is 40 mass % to 60 mass %.

7. The certain-shaped joint material as recited in claim 5 , wherein the plasticizer is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate or 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

8. The certain-shaped joint material as recited in claim 1 , wherein a temperature for the drying is 60° C. to 100° C.

9. The certain-shaped joint material as recited in claim 1 , which is installed between two nozzles for continuous casting of steel, wherein at least one of the two nozzles has a temperature of 200° C. or more.

Assignees

• Krosakiharima Corp

Inventors

• Oouchi Tatsuya
• Yamamoto Masaki

Classifications

• B22D41/54 Primary

  characterised by the materials used therefor · CPC title

• B22D41/502 Primary

  Connection arrangements; Sealing means therefor · CPC title

• C04B35/103

  containing non-oxide refractory materials, e.g. carbon (C04B35/106 takes precedence) · CPC title

• C04B2235/3218

  Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol · CPC title

• C04B2235/349

  Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite · CPC title