US-20260125852-A1 - SHEET MATERIAL INCLUDING METAL ORGANIC FRAMEWORK

Abstract

A sheet material 10 includes: paper 20 containing a fiber material 25 ; a fibrous metal 30 included in the paper 20 ; and metal organic frameworks 50 comprised of a metal and organic ligands, and the metal of the metal organic frameworks 50 is bonded to the fibrous metal 30 .

Inventors

• Wataru Michida
• Masato Kawahara

Assignees

• KABUSHIKI KAISHA F.C.C.

Dates

Publication Date

20260507

Application Date

20230614

Priority Date

20220630

Claims (10)

1. 1 . A sheet material comprising: paper containing a fiber material; a fibrous metal included in the paper; and metal organic frameworks comprised of a metal and organic ligands, wherein the metal of the metal organic frameworks is bonded to the fibrous metal.
2. 2 . The sheet material according to claim 1 , wherein at least a portion of the fibrous metal is located at a surface of the paper.
3. 3 . The sheet material according to claim 1 , wherein at least a portion of the fibrous metal is located inside the paper.
4. 4 . The sheet material according to any one of claims 1 to 3 , wherein the fibrous metal is identical to the metal of the metal organic frameworks.
5. 5 . The sheet material according to any one of claims 1 to 3 , wherein the fibrous metal is different from the metal of the metal organic frameworks.
6. 6 . The sheet material according to any one of claims 1 to 3 , wherein the fibrous metal includes a first metal and a second metal, and the metal organic frameworks include first metal organic frameworks including a metal identical to the first metal and second metal organic frameworks including a metal identical to the second metal.
7. 7 . The sheet material according to any one of claims 1 to 3 , wherein the paper includes a binder.
8. 8 . A method for producing a sheet material including paper containing a fiber material, a first metal included in the paper, and metal organic frameworks comprised of a second metal and organic ligands, the first metal and the second metal being bonded to each other, the method comprising: a production step of producing the paper by using the fiber material and the first metal; and a synthesis step of synthesizing the metal organic frameworks in the produced paper.
9. 9 . The method according to claim 8 , wherein the paper includes a binder, and in the production step, the paper is produced by using the fiber material, the binder, and the first metal.
10. 10 . A method for producing a formed body with a honeycomb structure including paper containing a fiber material, a first metal included in the paper, and metal organic frameworks comprised of a second metal and organic ligands, the first metal and the second metal being bonded to each other, the method comprising: a preparation step of preparing the paper including the fiber material and the first metal; a production step of producing an intermediate with the honeycomb structure by using the paper; and a synthesis step of synthesizing the metal organic framework in the produced intermediate.

Description

TECHNICAL FIELD The present invention relates to a sheet material including metal organic frameworks. This application claims the benefit of priority to Japanese Patent Application No. 2022-106178 filed on Jun. 30, 2022. The entire contents of this application are hereby incorporated herein by reference. BACKGROUND ART In recent years, metal organic frameworks (MOFs) have been actively studied as materials for use in gas storage and separation, deodorization, purification of air and water, and other purposes. Metal organic frameworks are comprised of metals and organic ligands and have various structures. Metal organic frameworks contain regularly arranged minute pores and have significantly large surface area. Thus, metal organic frameworks are expected to be used in a wide range of fields. Patent Document 1, for example, discloses a sheet material in which porous metal complexes are fixed to a thermoplastic resin nonwoven fabric. In Patent Document 1, porous metal complex particles are adhered to the surfaces of fibers before being united into a nonwoven fabric, incorporated with a sticking agent in a papermaking process, or sprinkled onto a nonwoven sheet and then fixed by application of heat. CITATION LIST Patent Document Patent Document 1: Japanese Patent Application Publication No. 2019-162573 SUMMARY OF INVENTION Technical Problems Metal organic frameworks, which include significantly minute particles, are difficult to handle. When metal organic frameworks are fixed to another member such as paper or a nonwoven fabric, the metal organic frameworks are insufficiently fixed to the other member, and as a result, might be detached. The present invention has been made in view of the foregoing problems, and has an object of providing a sheet material in which metal organic frameworks are more securely fixed to paper. Solution to Problem Through an intensive study, inventors of the present invention found that metal organic frameworks are more firmly fixed to paper not by fixing metal organic frameworks to the paper without any treatment but by bonding a metal of the metal organic frameworks to a metal included in the paper. A sheet material according to the present invention includes: paper containing a fiber material; fibrous metal included in the paper; and metal organic frameworks comprised of a metal and organic ligands, wherein the metal of the metal organic frameworks is bonded to the fibrous metal. In the sheet material according to the present invention, since the metal of the metal organic frameworks are bonded to the fibrous metal included in the paper, the metal organic frameworks are more firmly fixed to the paper than a case where the metal organic frameworks are bonded to paper without any treatment. This further suppresses detachment of the metal organic frameworks from the sheet material. In addition, since the metal is fibrous, the fiber material of the paper and the fibrous metal intertwine with each other to be more firmly fixed so that detachment of the metal organic frameworks is thereby suppressed. Furthermore, the metal organic frameworks can be arranged in a wider area in the paper. Advantages of Invention The present invention can provide a sheet material in which metal organic frameworks are more securely fixed to paper. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged cross-sectional view of a portion of a sheet material according to a first preferred embodiment. FIG. 2 is a flowchart showing a first production method that is a method for producing the sheet material according to the first preferred embodiment. FIG. 3 is a flowchart showing a second production method that is a method for producing a sheet material according to the first preferred embodiment. FIG. 4 is a partially enlarged cross-sectional view of a portion of a sheet material according to a second preferred embodiment. FIG. 5 is a partially enlarged cross-sectional view of a portion of a sheet material according to a third preferred embodiment. FIG. 6 is a flowchart showing a third production method that is a method for producing a sheet material according to the third preferred embodiment. FIG. 7A is a perspective view of a formed body. FIG. 7B is a front view of the formed body. FIG. 8 is a flowchart showing a first production method of a formed body. FIG. 9 is a flowchart showing a second production method of a formed body. DESCRIPTION OF PREFERRED EMBODIMENTS Preferred embodiments of a sheet material according to the present invention will be described with reference to the drawings. The sheet material is a member for use in adsorbing a specific gas, for example. The preferred embodiments described herein are, of course, not intended to particularly limit the present invention. Elements and features having the same functions are denoted by the same reference characters, and description for the same elements and features will not be repeated or will be simplified as appropriate. First Preferred