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Alumina fiber and alumina fiber aggregate

A technology of fiber aggregates and alumina, which is applied in the direction of transportation and packaging, artificial filaments made of inorganic materials, textiles and papermaking, etc. It can solve the problems of reduced number of fibers, difficulty in maintaining thickness and resilience for a long time, and achieve shape recovery sex good effect

Inactive Publication Date: 2015-11-11
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when comparing alumina fiber aggregates with the same mass, the larger the average fiber diameter, the greater the proportion of rigid and easily broken single fibers, and the number of fibers is relatively reduced. Therefore, sometimes it is difficult to Maintain predetermined thickness and resilience for a long time

Method used

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  • Alumina fiber and alumina fiber aggregate
  • Alumina fiber and alumina fiber aggregate
  • Alumina fiber and alumina fiber aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] "Example 1"

[0050]In such a way that the alumina component is 73% by mass and the silica component is 27% by mass, 5000 g of an aqueous aluminum hydroxychloride solution having an alumina solid content concentration of 20.0% by mass is mixed with a colloidal solution having a silica concentration of 20.0% by mass. 1850 g of silica was mixed, and further, the solid content of partially saponified polyvinyl alcohol (manufactured by Denki Kagaku Kogyo Co., Ltd.) with a degree of polymerization of 1700 was mixed so that the total solid content of the alumina component and the silica component was 8% by mass. 1096 g of an aqueous solution having a concentration of 10% by mass was then dehydrated and concentrated under reduced pressure to prepare a spinning stock solution with a viscosity of 3300 mPa·s. For this spinning stock solution, from the 300 holes with a diameter of 0.2 mmφ at equal intervals on the peripheral surface of a hollow disk with a diameter of 350 mmφ, the...

Embodiment 2～5

[0077] "Examples 2-5", "Comparative Examples 1-3"

[0078] In addition to changing the composition of alumina and silica in the spinning dope and the type and concentration of polyvinyl alcohol added to the spinning dope, prepare alumina fiber aggregates under the same conditions as in Example 1, and measure its physical properties. The composition of alumina and silica, the type and concentration of polyvinyl alcohol, the operating conditions of the device, and the evaluation results are shown in Table 1 together with Example 1.

[0079]

Embodiment 6～8

[0080] "Examples 6-8", "Comparative Examples 4, 5"

[0081] The fiber precursor was produced with the same composition as in Example 1, the maximum temperature of the crystallization process was changed in the range of 950°C to 1350°C, and the time required for the temperature rise of the crystallization process was changed accordingly. Except for the rate of temperature increase, alumina fibers and an alumina fiber aggregate composed of the fibers were prepared under the same conditions as in Example 1, and their physical properties were measured. Table 2 shows the compositions of alumina and silica, the type and concentration of polyvinyl alcohol, the operating conditions of the apparatus, and the evaluation results.

[0082]

[0083]From the results shown in Table 1, the aggregate of alumina fibers whose average fiber diameter is 3.0 μm to 8.0 μm and whose fiber diameter is larger than 10 μm is 5% or less shows a good shape. Resilience. On the other hand, when the alum...

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Abstract

The purpose of the present invention is to provide an alumina fiber, and an alumina fiber aggregate constituted from such fiber, that even in harsh usage environments maintains elasticity over long periods of time and can secure a honeycomb carrier. The alumina fiber has an alumina content of 70%-98% by mass, a silica content of 2%-30% by mass, an average fiber diameter of 3.0-8.0 µm or less, and a ratio of fibers with fiber diameters exceeding 10 µm of 5% or less in terms of number of fibers. The size of mullite crystallites contained in each fiber is 10-1500 Å. By using such fibers to form the alumina fiber aggregate, problems with a retainer material for a honeycomb carrier for an automobile are solved.

Description

technical field [0001] The present invention relates to alumina fibers and alumina fiber aggregates composed of the fibers. Background technique [0002] Inorganic fibers, such as amorphous ceramic fibers, crystalline alumina fibers, asbestos, glass wool, etc., are widely used, for example, as heat insulating materials for heating furnaces due to their excellent fire resistance and heat insulating properties. In addition, in the field of automobile parts, it is used as a holding material (also called a holding material) arranged between a ceramic honeycomb carrier used as an exhaust gas purification catalytic converter and a particulate filter of a diesel engine and its housing to prevent damage caused by vibration and impact. etc. make the honeycomb carrier collide with the inner wall of the casing and be damaged. In particular, in recent years, automobiles place emphasis on environmental performance. For the holding material of the honeycomb carrier, in order to maintain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D04H1/4209
CPCD04H1/4209C04B35/62236C04B35/62245C04B2235/3463C04B2235/526C04B2235/5264Y10T428/298D01F9/08
Inventor 大岛康孝酒井晴子江口政孝藤田一隆铃木良知
Owner DENKA CO LTD
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