Antibacterial nanofiber

Inactive Publication Date: 2010-05-13
NISSHINBO IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0036]Because the nanofiber of the present invention has in itself an antibacterial ability, there is no need for a separate antibacterial finish.
[0037]Therefore, the inventive nanofibers and textile materials made thereof do not require the use of chemicals such as antibacterial agents, making them safe even for use in gar

Problems solved by technology

However, a drawback of inorganic antibacterial agents is that, when added to plastics, the influence of heat during the molding process or light irradiation deforms the plastic, markedly lowering the value of the product.
Drawbacks of organic antibacterial agents include poor weather and chemical resistance, and a high acute oral toxicity.
These production steps are very complicated.
Hence, in each of the prior-art disclosures, an antibacterial agent or photocatalyst conferring step that is separate from

Method used

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  • Antibacterial nanofiber
  • Antibacterial nanofiber
  • Antibacterial nanofiber

Examples

Experimental program
Comparison scheme
Effect test

example 1

Polylactic Acid

[0132]Ten parts by weight of polylactic acid resin (LACEA H280, available from Mitsui Chemicals, Inc.) and 45 parts by weight of dimethylformamide (abbreviated below as “DMF”) were mixed and heated to 60° C., thereby dissolving the polylactic acid resin in the DMF and obtaining 55 parts by weight of a polylactic acid-containing solution (solids content, 18 wt %).

[0133]This lactic acid-containing solution (spinning dope) was placed in a syringe and electrostatic spinning was carried out at a discharge tip orifice diameter of 0.4 mm, an applied voltage of 20 KV (at room temperature and atmospheric pressure), and a distance from the discharge tip orifice to the fibrous substance collecting electrode of 15 cm, thereby giving a nanofiber nonwoven fabric.

[0134]The resulting nonwoven fabric had an average fiber diameter of 500 nm, and fibers with a diameter greater than 3 μm were not observed. The nonwoven fabric had a thickness of 100 μm and a basis weight of 15 g / m2. FIG. ...

example 2

Nylon 66

[0142]Ten parts by weight of nylon 66 (Amilan (registered trademark) CM3001-N; manufactured by Toray Industries, Inc.) was dissolved in 57 parts by weight of formic acid at room temperature (25° C.), thereby obtaining 67 parts by weight of a nylon 66-containing solution (solids content, 15 wt %).

[0143]This nylon 66-containing solution (spinning dope) was placed in a syringe and electrostatic spinning was carried out at a discharge tip orifice diameter of 0.4 mm and an applied voltage of 50 KV (at room temperature and atmospheric pressure), thereby giving a nanofiber nonwoven fabric. The resulting nonwoven fabric had an average fiber diameter of 250 nm, and fibers with a diameter greater than 1 μm were not observed. The nonwoven fabric had a thickness of 50 μm and a basis weight of 2.0 g / m2.

[0144]The ratio A2 / A1 of the peak height A2 near 1640 cm−1 to the peak height A1 near 1550 cm−1 in an infrared absorption spectrum of this nonwoven fabric was 1.7.

Bond Energy Ratio

[0145]Fr...

example 3

Nylon 6

[0149]Aside from using nylon 6 (A1030BRT, produced by Unitika, Ltd.) instead of nylon 66, a nanofiber nonwoven fabric was obtained in the same way as in Example 2.

[0150]The resulting nonwoven fabric had an average fiber diameter of 300 nm, and fibers with a diameter greater than 1 μm were not observed. The nonwoven fabric had a thickness of 50 μm and a basis weight of 3.5 g / m2.

[0151]The ratio A2 / A1 of the peak height A2 near 1640 cm−1 to the peak height A1 near 1550 cm−1 in an infrared absorption spectrum of this nonwoven fabric was 1.7.

Bond Energy Ratio

[0152]From Table 1 above, at 25° C., the C—H bond energy is 416 kJ / mol, the C—C bond energy is 357 kJ / mol, the C═O bond energy is 804 kJ / mol, the C—N bond energy is 273 kJ / mol, and the N—H bond energy is 391 kJ / mol.

[0153]The total bond energy is thus 416×10+357×5+804+273+391=7,413 kJ / mol.

[0154]The electron-withdrawing group bond energy is 804+273+391=1,468 kJ / mol.

[0155]Therefore, the bond energy ratio is 1,468 / 7,413=0.20.

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Abstract

Disclosed is an antibacterial nanofiber which comprises a polymer having an electron-withdrawing group and/or an electron-withdrawing atomic group and has an average fiber diameter of not less than 1 nm and less than 1000 nm, wherein the ratio of the binding energy of the minimum unit of the polymer at 25° C. to the binding energy of the electron-withdrawing group and/or the electron-withdrawing atomic group contained in the minimum unit of the polymer at 25° C. is 0.13 or greater. The nanofiber has an antibacterial activity by itself, and therefore can exhibit an antibacterial activity without the need of adding any antibacterial agent.

Description

TECHNICAL FIELD[0001]The present invention relates to an antibacterial nanofiber. More specifically, the invention relates to a nanofiber which has in itself an antibacterial ability, and is capable of exhibiting antibacterial properties even without the addition of an antibacterial agent.BACKGROUND ART[0002]Antibacterially finished textile products and shaped plastics have attracted attention in recent years. For example, garments, medical supplies and household goods conferred with antibacterial properties are currently available on the market.[0003]Various resins, including polyamides (see Patent Documents 1, 2 and 4), polyacrylonitriles (see Patent Documents 3 to 5), polyesters (see Patent Document 4), polylactic acids (see Patent Document 6), polyvinylidene chlorides (see Patent Documents 7 and 8), and polystyrenes (see Patent Documents 8 to 11), are used as the resins making up such antibacterial products.[0004]In these prior-art antibacterial products, an antibacterial finish...

Claims

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Application Information

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IPC IPC(8): D04H1/42D02G3/22B29C35/08D04H3/00D01F6/10D01F6/18D01F6/60D01F6/62D01F6/70D04H1/4382D04H1/72D04H1/728
CPCD01D5/0038D01F6/60D01F6/625D01F6/70D04H1/42D04H1/4382Y10T428/298D04H3/016B82Y40/00D01D5/0007Y10S977/788Y10S977/888Y10S977/903D04H3/005D04H1/4282D04H1/4326D04H1/72D04H1/43838Y10T428/249921Y10T442/626D01D5/003
Inventor IMASHIRO, YASUOSASAKI, NAOKAZUOGUSHI, YUKIKOIIZUKA, MAMI
Owner NISSHINBO IND INC
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