Fiber complexes and processes for preparing them

Patent metadata

Field	Value
Publication number	US-2021054563-A1
Application number	US-201916964597-A
Country	US
Kind code	A1
Filing date	Feb 15, 2019
Priority date	Feb 21, 2018
Publication date	Feb 25, 2021
Grant date	—

Abstract

The present invention aims to provide a technique for preparing a complex fiber covered by silica and/or alumina at a high coverage ratio. According to the present invention, complex fibers comprising silica and/or alumina deposited on the surface of a fiber at a high coverage ratio can be prepared by synthesizing silica and/or alumina on the fiber while maintaining the pH of the reaction solution containing the fiber at 4.6 or less.

First claim

1 . A process for preparing a complex fiber comprising silica and/or alumina deposited on the surface of a fiber, comprising synthesizing silica and/or alumina on the fiber while maintaining the pH of the reaction solution containing the fiber at 4.6 or less.

2 . The process of claim 1 , wherein the fiber is a cellulose fiber, a synthetic fiber, a semisynthetic fiber or a regenerated fiber.

3 . The process of claim 2 , comprising synthesizing silica and/or alumina using any one or more of an inorganic acid or an aluminum salt and an alkali silicate.

4 . The process of claim 3 , comprising synthesizing silica and/or alumina using sulfuric acid or aluminum sulfate and sodium silicate.

5 . The process of claim 4 , wherein the silica and/or alumina on the fiber complex has an average primary particle size of 100 nm or less.

6 . The process of claim 5 , wherein the silica and/or alumina on the fiber complex is amorphous.

7 . The process of claim 6 , comprising beating the fiber before synthesizing silica and/or alumina on the fiber.

8 . A process for preparing a sheet, comprising continuously forming a sheet using a paper machine from a slurry containing the complex fiber prepared by the process of claim 7 .

9 . A complex fiber comprising silica and/or alumina deposited on the surface of a fiber, wherein 30% or more of the surface of the fiber is covered by inorganic particles of silica and/or alumina.

10 . The complex fiber of claim 9 , wherein the silica and/or alumina deposited on the surface of the fiber is amorphous.

11 . A sheet, molding, board or resin comprising the complex fiber of claim 9 .

12 . A cement composition comprising the complex fiber of claim 9 .

13 . The process of claim 1 , comprising synthesizing silica and/or alumina using any one or more of an inorganic acid or an aluminum salt and an alkali silicate.

14 . The process of claim 1 , comprising synthesizing silica and/or alumina using sulfuric acid or aluminum sulfate and sodium silicate.

15 . The process of claim 1 , wherein the silica and/or alumina on the fiber complex has an average primary particle size of 100 nm or less.

16 . The process of claim 1 , wherein the silica and/or alumina on the fiber complex is amorphous.

17 . The process of claim 1 , comprising beating the fiber before synthesizing silica and/or alumina on the fiber.

18 . A process for preparing a sheet, comprising continuously forming a sheet using a paper machine from a slurry containing the complex fiber prepared by the process of claim 1 .

Assignees

• Jujo Paper Co Ltd

Inventors

• Fuchise Moe
• Matsumoto Hiroto
• Nagahara Dai

Classifications

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B20/1066

  Oxides, Hydroxides · CPC title

• C04B18/28

  Mineralising; Compositions therefor · CPC title

• D06M2200/30

  Flame or heat resistance, fire retardancy properties · CPC title