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Alumina fiber aggregate and method for production thereof

A technology of alumina fiber and manufacturing method, which is applied to non-woven fabrics, building structures, textiles and paper making, etc. Less scattering, excellent operability and work environment hygiene

Inactive Publication Date: 2003-12-31
MITSUBISHI PLASTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the diameter of the short alumina fibers is small, the short alumina fibers tend to scatter and the workability deteriorates. At the same time, the work environment is not hygienic.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]

[0044] First, basic aluminum chloride with an aluminum concentration of 165g / L per 1.0L: Al(OH) 3-X Cl X (X=0.51) was added and mixed with 606 g of 20% by weight silica sol solution and 608 g of 5% by weight polyvinyl alcohol (polymerization degree: 1700) aqueous solution, then concentrated under reduced pressure at 50°C to obtain a spinning solution. The viscosity of the spinning solution is 60 poise (measured by a rotational viscometer at 25°C), and the ratio of aluminum to silicon (Al 2 o 3 and SiO 2 The weight ratio) is 72.0:28.0, the concentration of basic aluminum chloride is 190g / L, and the concentration of organic polymer is 35.0g / L.

[0045]

[0046] The above-mentioned spinning solution was spun by blowing. As the spinning nozzle, a spinning nozzle having the same structure as described in FIG. 6 of European Patent No. 495466 (Japanese Patent No. 2602460 ) was used. And, spinning is carried out under following conditions: the diameter of spinning so...

Embodiment 2

[0051]

[0052] First, basic aluminum chloride with an aluminum concentration of 165g / L per 1.0L: Al(OH) 3-X Cl X (X=0.51) was added and mixed with 606 g of 20% by weight silica sol solution and 608 g of 5% by weight polyvinyl alcohol (polymerization degree: 1700) aqueous solution, then concentrated under reduced pressure at 50°C to obtain a spinning solution. The viscosity of the spinning solution is 40 poise (measured by a rotational viscometer at 25°C), and the ratio of aluminum to silicon (Al 2 o 3 and SiO 2 The weight ratio) is 72.0:28.0, the concentration of basic aluminum chloride is 180g / L, and the concentration of organic polymer is 33.2g / L.

[0053]

[0054] It carried out similarly to Example 1. Table 1 shows the results of measuring the fiber diameter distribution of the alumina short fibers constituting the obtained alumina fiber aggregates. The average fiber diameter was 4.9 μm and the minimum fiber diameter was 3.3 μm.

reference example 1

[0072] The average fiber diameter of existing alumina fibers is generally 2 to 5 μm, and the alumina fibers commercially available from three companies were analyzed. The results are shown in Table 2.

[0073] Average fiber diameter (μm)

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PUM

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Abstract

An alumina fiber aggregate comprising alumina short fibers whose average diameter is 4.0 to 10.0 mum and smallest diameter is not less than 3.0 mum, and a method of producing an alumina fiber aggregate which comprises spinning a spinning solution containing basic aluminum chloride, a silicon compound, an organic polymer and water by the blowing method, and calcining the obtained aggregate of alumina short fiber precursor, the spinning solution being one in which the aluminum / silicon ratio is 99 / 1 to 65 / 35 calculated as Al2O3 / SiO2 ratio by weight, the concentration of basic aluminum chloride is 180 to 200 g / L and the concentration of the organic polymer is 20 to 40 g / L. The alumina short fibers in the alumina fiber aggregate are enlarged in diameter to suppress scattering of the fibers.

Description

technical field [0001] The present invention relates to alumina fiber aggregates and methods of making the same. Background technique [0002] Alumina fiber aggregates have excellent heat resistance, and by taking advantage of this characteristic, they are processed into alumina fiber scaffolds and used as heat insulating materials. Such a fiber support can be produced, for example, by the following method. [0003] That is, a spinning solution containing basic aluminum chloride, a silicon compound, an organic polymer, and water is spun by a blowing method, and the resulting aggregate (laminated sheet) of the alumina short fiber precursor Firing is performed after needling. In addition, in the firing process, while removing volatile components, crystallization of alumina and silicon proceeds to convert it into alumina fibers. As a result, an alumina fiber aggregate made of alumina short fibers was obtained. Such a manufacturing method is generally called the precursor fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/634D01F9/08D04H1/4209D04H1/46D04H1/498D04H1/56D04H1/72D04H13/00E04B1/72E04B1/76
CPCC04B2235/3418C04B35/62236C04B2235/444C04B2235/5264E04B1/7662D04H1/72C04B2235/3218D04H1/46D04H1/4209D01F9/08C04B35/62245D04H1/498C04B35/63416Y10T428/2913Y10T428/265Y10T428/249921D04H1/4382D04H1/70D04H1/4234
Inventor 荘司守池田宪雄笹木利明
Owner MITSUBISHI PLASTICS INC