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Method for producing microfiber aggregate

A technology of microfibers and manufacturing methods, applied in fiber processing, dry spinning, melt spinning, etc., to achieve good productivity and easy maintenance

Inactive Publication Date: 2009-08-05
KANKYOKIKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, the current situation is that there is no established method to obtain a fine fiber assembly by electrospinning method that is easy to maintain and excellent in productivity.

Method used

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  • Method for producing microfiber aggregate
  • Method for producing microfiber aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Polyvinyl alcohol having a saponification degree of 87.0 to 89.0 mol% was dissolved in water to prepare a polymer solution (a spinning solution) having a solid content concentration of 20% by mass. Such as figure 1 As shown, the polymer solution 3 was put into a cylindrical container made of stainless steel with a diameter of 80 mm, and a non-woven fabric 2 (non-woven fabric made by Hirose Paper Co., Ltd., trade name 15TH145) was set as a porous material for foam generation to make It is possible to supply compressed air 1 from the bottom surface. The compressed air of 4.0 kPa was supplied through the non-woven fabric 2 to continuously generate foam 4 on the entire surface of the polymer solution. As a counter electrode, an aluminum foil (not shown) was provided at a position 8 cm from the surface of the foam. After the generation of foam on the polymer solution becomes uniform, a 40KV DC high voltage is applied to the polymer solution side to form a fine fiber assembly on ...

Embodiment 2～8

[0082] The concentration of polyvinyl alcohol with a saponification degree of 87.0-89.0 mol% was adjusted under the conditions shown in Table 1, and the pressure of the porous material for foam generation and the compressed air was changed. Spinning was performed in the same manner as in Example 1, and the fine fibers were measured. The spinning weight of the aggregate. The results are shown in Table 1. It can be seen that the pressure of the compressed air rises and the spinning weight increases at the same time.

[0083] 【0039】

Embodiment 9～10

[0085] Poly-ε-caprolactone having a weight average molecular weight of 80,000 was dissolved in acetone to prepare a polymer solution having a solid content of 5% by mass. As shown in Table 1, the pressure of the foam-generating porous material and compressed air was changed, spinning was performed in the same manner as in Example 1, and the spinning weight of the fine fiber assembly was measured. The results are shown in Table 1. It can be seen that the pressure of the compressed air rises and the spinning weight increases at the same time.

[0086] 【0040】

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PUM

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Abstract

A process for producing a fiber assembly requiring micropores, such as a battery separator or any of various filters; in particular, a process for producing a fiber assembly according to electrostatic spinning that excels in productivity, being easy in maintenance. There is provided a process for producing a microfiber assembly, comprising applying high voltage to bubbles (4) continuously generated in polymer solution (3) or a polymer melt to thereby carry out electrostatic spinning. The bubbles (4) can be those generated by passing compressed air (1) through porous material (2), or minute canal, of a member or a combination of two or more members selected from among plastic, ceramic and metal material.

Description

Technical field [0001] 【0001】 [0002] The present invention relates to a method for producing a fine fiber assembly using an electrospinning method that is excellent in productivity and easy to maintain. Background technique [0003] 【0002】 [0004] Fiber aggregates represented by non-woven fabrics, such as battery separators or filters, have been used to effectively utilize fine pores. The size of the micropores varies according to the field of application. For example, in a separator for a nickel-hydrogen battery, it is in the range of 1 to 30 μm, but in a separator for a lithium ion battery, a pore diameter of 0.1 to 1 μm is required. In particular, since lithium ion secondary batteries can have a high energy density and are expected to be required in the future, it is also an important technical issue to ensure the reliability of micropore control for their separators. [0005] 【0003】 [0006] It is known that the size of the micropores of the fiber assembly is greatly affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/72D01D5/04D01D5/08D04H1/728
CPCD04H1/728D01D5/0069D04H1/42D04H1/43838D01D5/00D04H3/16
Inventor 岸本吉则
Owner KANKYOKIKI CORP