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Inorganic nanofiber and method for manufacturing same

a technology of nanofibers and nanofibers, which is applied in the field of inorganic nanofibers, can solve the problems of metal blade damage, difficult to obtain inorganic short fibers having a short fiber length of 200 m or less, and difficult to use fibers as fillers for thinner polymer films, etc., and achieves good mechanical strength and not easily deformed. , the effect of good mechanical strength

Inactive Publication Date: 2016-02-25
NIPPON BAIRIIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new type of inorganic nanofiber that has several technical benefits. By using a special process called electrospinning, the nanofiber can be made very thin and uniform in its length. This makes it easy to create a composite with thin and uniform properties. The nanofiber is also mechanically strong and can maintain its shape and stability when exposed to changes in temperature. Additionally, the nanofiber has good thermal conductivity and high porosity, which makes it ideal for use as a filler in polymer films. The patent also describes a method for easily producing nanofibers with a desired refractive index by mixing different solutions of inorganic oxides. Overall, the invention provides a way to create thin, uniform, and strong nanofibers with good thermal conductivity and stability.

Problems solved by technology

This is because if the filler is thicker or longer than the thickness of the polymer film, the filler is likely to protrude from the polymer film, and therefore, many practical problems arise.
Although this document exemplifies conventional fiber cutting machines, such as a guillotine-type cutting machine and a rotary cutter-type cutting machine, as a method of manufacturing the inorganic short fiber, even if these conventional fiber cutting machines were used, it was extremely difficult to obtain inorganic short fibers having a short fiber length of 200 μm or less, as described in the Examples of the document, due to the mechanism of the machines, and it was difficult to use the fibers as a filler for thinner polymer films.
In addition, since these cutting machines use a metal blade, there was a problem wherein the metal blade was damaged at the time of cutting, and a piece of metal was mixed in with inorganic short fibers or an inorganic fiber aggregate.
This problem was remarkable in the case of manufacturing short fibers consisting of a hard inorganic material such as alumina, which was also used as an abrasive.
However, even if these crushing devices were used, fibers could not be sufficiently crushed to obtain fine fibers having an average fiber diameter of 2 μm or less, or even if fibers could be crushed, short fibers in which the fiber length were uniform could not be prepared.
However, this filler could not be applied to resins other than polycarbonate resins.
In addition to this problem, it was considered that the adjusting of the refractive index was difficult, because it contained at least four components.
It was examined whether or not the refractive index could be controlled utilizing this technique, but the fine adjustment of the refractive index was difficult, and it was difficult to obtain silica-alumina sintered ultrafine long fibers having a uniform refractive index.

Method used

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  • Inorganic nanofiber and method for manufacturing same
  • Inorganic nanofiber and method for manufacturing same
  • Inorganic nanofiber and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0123]Tetraethyl orthosilicate, water, and hydrochloric acid were mixed at a molar ratio of 1:2:0.0025, and the mixture was heated and stirred at a temperature of 80° C. for 15 hours. The reaction mixture was concentrated using an evaporator until the silica concentration became 44 wt %, and was thickened until the viscosity became 200 to 300 mPa·s, to obtain a silica sol solution.

[0124]Next, spinning was carried out using the silica sol solution under the spinning conditions shown in Table 1, and sintering was carried out under the sintering conditions shown in Table 1, to obtain a silica nanofiber sheet having an average fiber diameter of 1 μm (mass per unit area: 26.0 g / m2).

TABLE 1SinteringSpinning conditionsconditions in#1#2#3#4sintering furnaceUnitg / hr.cm° C. / % RHkV° C. / hr.Example 111025 / 30+10800 / 2Example 211025 / 30+10800 / 2Example 311025 / 30+30800 / 2Example 40.2525 / 20+10800 / 2Comp.11025 / 30+10800 / 2Example 1Comp.11025 / 30+10800 / 2Example 2Comp.11025 / 30+10800 / 2Example 3#1: Amount extrud...

example 2

[0126]Approximately 1 g of a silica nanofiber sheet (mass per unit area: 26.0 g / m2), which had been prepared in a similar manner to that of Example 1, was weighed out, and the silica nanofiber sheet was stacked so that the thickness became 1.5 cm. The stacked sheet was pressed and crushed using a press machine at a pressure of 10 MPa for 30 seconds, to prepare inorganic sintered nanofibers having an average fiber diameter of 1 μm, an average fiber length of 10 μm, and a CV value of the fiber length of 0.266 (aspect ratio: 10).

example 3

[0127]Zirconium tetra-n-butoxide [Zr(OnBu)4], ethyl acetoacetate, hydrazinium chloride, and water were mixed at a molar ratio of 1:1.75:0.02:1.5, and the mixture was stirred at room temperature for 3 days. The reaction mixture was concentrated using an evaporator until the zirconia concentration became 30 wt %, and was thickened until the viscosity became 2100 to 2700 mPa·s, to obtain a zirconia sol solution.

[0128]Next, spinning was carried out using the zirconia sol solution under the spinning conditions shown in Table 1, and sintering was carried out under the sintering conditions shown in Table 1, to obtain a zirconia nanofiber sheet having an average fiber diameter of 500 nm (mass per unit area: 17.4 g / m2).

[0129]Next, approximately 1 g of the zirconia nanofiber sheet was weighed out, and the zirconia nanofiber sheet was stacked so that the thickness became 1.5 cm. The stacked sheet was pressed and crushed using a press machine at a pressure of 1 MPa for 1 second, to prepare inor...

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Abstract

Disclosed are an inorganic nanofiber characterized in that the average fiber diameter is 2 μm or less, the average fiber length is 200 μm or less, and the CV value of the fiber length is 0.7 or less; and a method of manufacturing the same. In the manufacturing method, an inorganic nanofiber sheet consisting of inorganic nanofibers having an average fiber diameter of 2 μm or less is formed by electrospinning, and then, the inorganic nanofiber sheet is pressed using a press machine and crushed so that the average fiber length becomes 200 μm or less, and the CV value of the fiber length becomes 0.7 or less.

Description

TECHNICAL FIELD[0001]The present invention relates to an inorganic nanofiber, and a method of manufacturing the same. The inorganic nanofiber of the present invention may be suitably used as materials which constitute, for example, a filler, a catalyst carrier, a structural material, an electrode material, a filter material, or the like. According to the manufacturing method of the present invention, an inorganic mixed nanofiber, which may be suitably used as a filler for a transparent resin sheet, can be easily produced, since it is easy to adjust the refractive index.BACKGROUND ART[0002]A filler is added, for example, in order to improve mechanical properties such as strength, or thermal properties of a polymer film. In the recent trend of miniaturization of electrical equipment, there is a thinning trend in the field of polymer films. The thinner a polymer film is, the finer and shorter a filler added to the polymer film must be. This is because if the filler is thicker or longer...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K7/08D01F9/08
CPCC08K7/08D10B2101/02D01F9/08C04B35/62231D01D5/0007D01D1/02B32B18/00C04B35/62236C04B35/6224C04B35/6225C04B35/624C04B2235/44C04B2235/441C04B2235/526C04B2235/5264C04B2235/5268C04B2237/38C08K3/22C08K2003/2227
Inventor KOSAKA, YUSUKETARAO, TAKASHI
Owner NIPPON BAIRIIN
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