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Polyolefin-based split-type conjugate fibre, fibrous mass and cell separator using same, and production method for same

A composite fiber, manufacturing method technology, applied in the direction of conjugated synthetic polymer rayon, fiber processing, secondary battery, etc., to achieve the effects of high puncture strength, excellent stretchability and splitability

Active Publication Date: 2012-12-12
DAIWABO HLDG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, among polyolefin-based split-type conjugate fibers obtained by combining various polyolefin-based resins, split-type conjugate fibers having a fineness suitable for applications requiring a high degree of splitting at a finer fineness and good splittability have not yet been obtained, The above-mentioned uses are, for example, fiber assemblies for wiping various types of wipes such as wipes against people and / or objects, fiber assemblies for battery separators used in various secondary batteries such as lithium-ion batteries and nickel-metal hydride batteries, and cylindrical Applications such as fiber aggregates for filter layers of various filters such as filters and laminated filters

Method used

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  • Polyolefin-based split-type conjugate fibre, fibrous mass and cell separator using same, and production method for same
  • Polyolefin-based split-type conjugate fibre, fibrous mass and cell separator using same, and production method for same
  • Polyolefin-based split-type conjugate fibre, fibrous mass and cell separator using same, and production method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0160] As the first component, a homopolypropylene resin with a Q value of 10.7, Mn of 51,000, Mw of 540,000, Mz of 3,000,000, MFR230 of 10 g / 10 minutes, and a tensile modulus of 2,400 MPa was used as the second component. Polymethylpentene-based resin having a melting point of 238° C., an MFR260 of 180 g / 10 minutes, a tensile elastic modulus of 1765 MPa, and a Rockwell hardness of 90 ("DX820" manufactured by Mitsui Chemicals). Next, the composite ratio (volume ratio) of the first component and the second component was set to 5:5, and the first component was melt-spun at a spinning temperature of 350° C., and the second component was melt-spun using a hollow 8-split composite spinneret. The ingredients are melt-spun at a spinning temperature of 280°C to obtain a denier of 10dtex and as figure 1 The cross-section of the fiber shown in A is a gear-shaped, undrawn split-type conjugate fiber (undrawn fiber bundle, spun filament) with 8 splits (hereinafter referred to as hollow 8-s...

Embodiment 2）

[0164] Melt spinning is carried out under the same conditions as in Example 1, and the undrawn fiber bundle obtained is stretched at a draw ratio of 5.9 times under the same temperature conditions as in Example 1 to obtain a fineness of 1.7dtex , Split-type composite fiber with a hollow rate of 20%. In addition, the draw ratio was 78.7% of the maximum draw ratio. A wet-laid nonwoven fabric was obtained in the same manner as in Example 1 using the obtained split-type conjugated fibers. In the obtained wet-laid nonwoven fabric, the split ratio of the split-type conjugate fibers was 60%. In addition, an interwoven nonwoven fabric was obtained from a wet-laid nonwoven fabric in the same manner as in Example 1. In the obtained entangled nonwoven fabric, the split ratio of the split type conjugate fibers was 100%.

Embodiment 3）

[0166] When performing melt spinning, as a spinning spinneret, a composite spinneret of a solid 8-split type without a hollow portion is used, except that, under the same conditions as in Example 1, melt spinning is carried out to obtain a fineness of 10dtex, the cross-sectional shape is asfigure 1 The cross-section of the fiber shown in B is a gear-shaped undrawn fiber bundle (spun filament) having 8 divisions without a hollow portion. The resulting undrawn fiber bundle (spun filament) was stretched at a draw ratio of 5.9 times under the same temperature conditions as in Example 1 to obtain a solid 8-split split type with a fineness of 1.7 dtex Composite fibers. In addition, the draw ratio was 78.7% of the maximum draw ratio. A wet-laid nonwoven fabric was obtained in the same manner as in Example 1 using the obtained split-type conjugated fibers. In the obtained wet-laid nonwoven fabric, the split ratio of the split type conjugate fibers was 55%. In addition, an interwove...

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Abstract

The disclosed polyolefin-based split-type conjugate fibre is a compositely spun polyolefin-based split-type conjugate fibre which contains a first component that includes a polypropylene-based resin, and a second component that includes a polyolefin-based resin. The first component includes, as the main component thereof, a polypropylene resin wherein the Q-value (weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio) is not less than 6, and the melt flow rate (MFR; measured temperature 230 DEG C, load 2.16kgf (21.18N)) equivalent to JIS K 7210 is at least 5g / 10 minutes but less than 23g / 10 minutes; and the first component and the second component are adjacent to one-another in the cross section of the polyolefin-based split-type conjugate fibre. Furthermore, the disclosed polyolefin-based split-type conjugate fibre can be obtained by using a split-type composite nozzle to melt spin the first component and the second component, and then stretching the resulting fibre.

Description

technical field [0001] The present invention relates to a polyolefin-based segmented composite fiber, a fiber assembly and a battery separator using the composite fiber, and a method for producing the same. In detail, it relates to a polyolefin-based segmented composite fiber comprising a first component containing a polypropylene-based resin and a second component containing a polyolefin-based resin, a fiber assembly and a battery separator using the composite fiber, and its Manufacturing method. Background technique [0002] Originally, split-type conjugate fibers obtained by combining resins of the same family such as polyolefin resins have high compatibility between the resins to be combined, so the resin components are easily bonded firmly at the interface. Therefore, split-type conjugate fibers that combine incompatible polymers, such as split-type conjugate fibers that combine polyester-based resins and polyolefin-based resins, or split-type composite fibers that com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/06D04H1/4382D04H1/4291D01D5/28D01D5/12H01M2/16D04H1/541H01M50/403H01M50/406H01M50/417H01M50/42H01M50/423H01M50/429H01M50/494
CPCY02E60/12D04H1/541D01D5/30D01F8/06H01M2/145A61L15/00H01M2/162H01M10/0525H01M10/345Y10T428/2931Y02E60/10H01M50/44H01M50/403D04H1/5412D04H1/5418H01M50/429H01M50/417H01M50/406H01M50/494H01M50/423H01M50/42D01D5/098D04H1/43825
Inventor 木田达宣
Owner DAIWABO HLDG
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