Manufacturing method of plugged honeycomb structure

Patent metadata

Field	Value
Publication number	US-11773022-B2
Application number	US-201815874215-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Feb 6, 2017
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A manufacturing method of a plugged honeycomb structure including a plugging material preparing step of mixing a ceramic raw material, a pore former, a thickener, an organic binder, a dispersing agent, and water and preparing the plugging material which is slurried, to form the plugging portions, wherein the plugging material preparing step includes: a powder mixing step of mixing the ceramic raw material, the pore former, the organic binder and the dispersing agent each of which is constituted of powder, at predetermined blend ratios, a thickener mixing step of adding and mixing the thickener to a powder mixture obtained by the powder mixing step, and a kneading step of adding the water to a thickener added mixture obtained by the thickener mixing step, to perform kneading.

First claim

What is claimed is:

1. A manufacturing method of a plugged honeycomb structure having a plurality of cells defined by partition walls and forming through channels for a fluid, and plugging portions arranged to plug one of end portions of each of predetermined cells with a plugging material and plug the other end portion of each of residual cells with the plugging material, in accordance with a prescribed arrangement standard, the manufacturing method comprising a plugging material preparing step of mixing a ceramic raw material, a pore former, a thickener, an organic binder, a dispersing agent, and water and preparing the plugging material which is slurried, to form the plugging portions, wherein the plugging material preparing step comprises: a powder mixing step of mixing the ceramic raw material, the pore former, the organic binder and the dispersing agent each of which is constituted of powder, at predetermined blend ratios, a thickener mixing step of adding and mixing the thickener to a powder mixture obtained by the powder mixing step, and a kneading step of adding the water to a thickener added mixture obtained by the thickener mixing step, to perform kneading, wherein in the thickener mixing step, a total number of stirring revolutions of the powder mixture and the thickener is set to 500 times or less, and Page 2 of 8 the powder mixture and the thickener are in contact for 2 minutes or less during the thickener mixing step, wherein the thickener is polyethylene oxide.

2. The manufacturing method of the plugged honeycomb structure according to claim 1 ,
wherein the pore former is added at a ratio of 5 mass % to 30 mass % to a total mass of the ceramic raw material, and
the thickener is added at a ratio of 0.4 mass % to 5 mass % to the total mass of the ceramic raw material.

3. The manufacturing method of the plugged honeycomb structure according to claim 1 ,
wherein a porosity of the plugging portions is in a range of 70% to 90%.

Assignees

• Ngk Insulators Ltd

Inventors

• Nagai Shungo
• Hayashi Hiroaki

Classifications

• C04B26/04 Primary

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• B01D46/0001

  Making filtering elements · CPC title

• B28B11/006

  Making hollow articles or partly closed articles · CPC title

• B28B11/007

  Using a mask for plugging · CPC title

• B28B17/026

  Conditioning ceramic materials · CPC title