Production method of alumina continuous fiber sheet and alumina continuous fiber sheet

A kind of aluminum oxide, continuous fiber technology, applied in the direction of non-woven fabrics, textiles and papermaking, artificial filaments of inorganic raw materials, etc., can solve the problems of honeycomb carrier damage, failure to relieve impact, insufficient holding force, etc.

Active Publication Date: 2021-08-10
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, even if the strength of the fiber itself is sufficient, when the areal mass (mass per unit area) of the retaining material placed in the catalytic converter is uneven, in the high areal mass portion, due to the excessively high retaining force (pressure) , there is a risk that the cellular carrier may fail to break
On the other hand, in the low-area quality part, the impact cannot be relieved due to insufficient holding force, which may lead to the breakage of the honeycomb carrier

Method used

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  • Production method of alumina continuous fiber sheet and alumina continuous fiber sheet
  • Production method of alumina continuous fiber sheet and alumina continuous fiber sheet
  • Production method of alumina continuous fiber sheet and alumina continuous fiber sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] "Example 1"

[0072] Mixing an aluminum oxychloride aqueous solution with an alumina solid content concentration of 20.0 mass % and a silica colloid with a silica concentration of 20.0 mass % so that the alumina content is 73 mass % and the silica content is 27 mass %; Further, a partially saponified polyvinyl alcohol solution with a degree of polymerization of 1700 and a solid content concentration of 10% was mixed so that the total solid content of the alumina component and the silica component was 8%; thereafter, dehydration and concentration under reduced pressure were carried out, A spinning dope with a viscosity of 2000 mPa·s was produced.

[0073]This spinning dope is provided to a hollow disk with a diameter of 350mmφ, and 300 fine holes with a diameter of 0.2mm are opened at equal intervals on the circumference of the disk, so as to be sprayed out with a discharge amount of 25mL / h per hole. The disk was rotated at a peripheral speed of 47.6 m / sec, whereby the ...

Embodiment 2、3

[0089] "Example 2, 3"

[0090] An alumina-based continuous fiber sheet was produced in the same manner as in Example 1 except that the type of slicer was changed. The slicer used is as follows.

Embodiment 2

[0091] Example 2: Band saw slicer (slicer that rotates a ribbon blade at high speed)

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Abstract

The invention provides a method for producing continuous alumina fiber sheets, which are produced through the following steps: (1) spinning a spinning stock solution with aluminum compounds and silicon compounds as main components to obtain alumina fiber precursors The steps of (II) depositing the above-mentioned alumina fiber precursor on a layer assembly device to form a continuous sheet of the precursor, (III) cutting the surface layer of the continuous sheet of the precursor with a microtome (1) to The step of making it smooth, (IV) the step of performing entanglement treatment on the above-mentioned precursor continuous sheet by needle punching, and (V) the step of firing the above-mentioned precursor continuous sheet; and providing at least one side surface A continuous fiber sheet made of alumina whose variation in coefficient of friction is 10% or less.

Description

technical field [0001] The present invention relates to a method for producing an alumina-based continuous fiber sheet and an alumina-based continuous fiber sheet. Background technique [0002] As one method of producing an alumina-based continuous fiber sheet, there is known a spinning dope containing an aluminum compound to form an alumina fiber precursor, and the precursor fiber is deposited on an endless belt to form the precursor The continuous sheet is a method of forming an alumina continuous sheet by firing. In addition, in order to further improve the mechanical strength of the alumina-based continuous fiber sheet, there is known a method of producing an alumina fiber sheet by subjecting a precursor sheet to a needle-punching process (nidoling process) and then subjecting it to a sintering process. [0003] The alumina-based continuous fibrous sheet produced by the above-described method is widely used, for example, as a heat insulating material for a heating furna...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/4209D04H1/46D06C7/04D01F9/08
CPCD01F9/08D04H1/4209D04H1/46D06C7/04
Inventor 大岛康孝藤浩一野泽和己
Owner DENKA CO LTD
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