WO2019124408A1 - Non-tissé obtenu par fusion-soufflage - Google Patents

Non-tissé obtenu par fusion-soufflage Download PDF

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Publication number
WO2019124408A1
WO2019124408A1 PCT/JP2018/046653 JP2018046653W WO2019124408A1 WO 2019124408 A1 WO2019124408 A1 WO 2019124408A1 JP 2018046653 W JP2018046653 W JP 2018046653W WO 2019124408 A1 WO2019124408 A1 WO 2019124408A1
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WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
fibers
melt
less
straightness
Prior art date
Application number
PCT/JP2018/046653
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English (en)
Japanese (ja)
Inventor
竜規 伊藤
正和 佐瀬
太一 新津
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018215397A external-priority patent/JP6771012B2/ja
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to MYPI2020003174A priority Critical patent/MY188653A/en
Priority to KR1020207018580A priority patent/KR102233538B1/ko
Priority to RU2020123901A priority patent/RU2754413C1/ru
Priority to EP18890630.9A priority patent/EP3730685B1/fr
Priority to CN201880082713.3A priority patent/CN111527254B/zh
Publication of WO2019124408A1 publication Critical patent/WO2019124408A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/24—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • the present invention relates to a meltblown nonwoven fabric produced by a meltblowing method.
  • a meltblown nonwoven fabric is a nonwoven fabric produced by a meltblowing method, and it is known that the distance between the fibers is small because the thin fibers are closely overlapped with each other, and it has high water resistance (Patent Document 1).
  • the melt-blowing method is a spinning step of drawing a molten thermoplastic resin composition into a fibrous form by blowing out a molten thermoplastic resin composition from a die having a plurality of nozzles at a high speed and a high velocity, and the obtained fibers are deposited on a collecting surface And a depositing step for fusing, suitable for producing fine fibers.
  • Patent Document 1 International Publication No. 2012/102398
  • the present invention is a melt-blown nonwoven fabric having an average fiber diameter of 4 ⁇ m or less
  • a meltblown nonwoven fabric is provided, which has a first direction along the plane of the meltblown nonwoven fabric and in which the straightness of fibers is the highest, and a second direction orthogonal to the first direction.
  • the straightness of the fibers in the first direction and the second direction is 35% or more.
  • the meltblown nonwoven fabric satisfies one or more conditions selected from the following (I), (II) and (III).
  • the straightness of fibers in the first direction and the second direction is 35% or more.
  • the ratio of the straightness of fibers in the first direction to the straightness of fibers in the second direction is 1 or more. 5 or less.
  • the water pressure resistance of the melt-blown non-woven fabric is 100 mm H 2 O or more and 10000 mm H 2 O or less, and optionally, the water-pressure resistant retention when the melt-blown non-woven fabric is deformed in the second direction is 85% or more.
  • the melt-blown nonwoven fabric of (I) has a ratio of a linear movement ratio of fibers in the first direction to a linear movement ratio of fibers in the second direction (a linear movement ratio of fibers in the first direction / the second direction
  • the straightness of fibers is 1 or more and 2.5 or less.
  • the above-mentioned (I) or the (II) melt-blown nonwoven fabric has a water pressure resistance of 100 mm H 2 O or more and 10000 mm H 2 O or less.
  • the melt-blown nonwoven fabric of (I) or (II) has a water pressure resistance retention of 85% or more when the melt-blown nonwoven fabric is deformed in the second direction.
  • the meltblown non-woven fabric has a filling rate of 3% or more and / or 30% or less.
  • the heat of fusion of the fibers is greater than 5 mJ / mg and / or less than 94 mJ / mg.
  • the present invention is a melt-blown nonwoven fabric having an average fiber diameter of 0.1 ⁇ m to 4 ⁇ m,
  • the straightness of the fibers in the first direction along which the meltblown nonwoven fabric has the highest straightness of the fibers and in the second direction orthogonal to the first direction is 35% or more.
  • the ratio of the straightness of fibers in the first direction to the straightness of fibers in the second direction is 1 or more and 2.5 or less Yes,
  • the filling rate is 3% or more and 30% or less
  • the melt-blown nonwoven fabric is provided, wherein the heat of fusion of the fibers is more than 5 mJ / mg and less than 94 mJ / mg.
  • the melt-blown nonwoven fabric has a ratio of a straightness of fibers in the first direction to a straightness of fibers in the second direction (a straightness of fibers in the first direction / a straightness of fibers in the second direction ) Is 1 or more and 1.9 or less.
  • the first direction, the second direction, and the rectilinear rate are determined by the following procedures (a) to (g).
  • N (0), N (1) and N (2) respectively represent the following.
  • N (0) is the number of fibers continuously extending from one end to the other end of the SEM image
  • N (1) is the number of fibers crossing one end in the long side
  • N (2) is the length in the long side
  • the meltblown non-woven fabric has a filling factor of 6% or more and / or 15% or less.
  • the meltblown nonwoven has a formation index of at least 30, and / or at most 300, optionally at most 200.
  • the heat of fusion of the fiber is 20 mJ / mg or more and / or 80 mJ / mg or less.
  • this invention provides the leak-proof sheet which has the said melt-blown nonwoven fabric. Further, according to the present invention, there is provided a liquid-permeable top sheet disposed on the side facing the skin, Liquid-repellent back sheet disposed on the non-skin facing side, And an absorbent disposed between the sheets. The back sheet provides the absorbent article which is the leakproof sheet.
  • the present invention also provides a method for producing a melt-blown nonwoven fabric, including a spinning step of discharging a molten thermoplastic resin composition from a nozzle and forming it into a fibrous form by air flow.
  • the manufacturing method manufactures a meltblown nonwoven fabric having an average fiber diameter of 4 ⁇ m or less.
  • the temperature of the air flow is equal to or higher than the melting point of the thermoplastic resin composition.
  • the heat of fusion of the thermoplastic resin composition is more than 5 mJ / mg and / or less than 94 mJ / mg.
  • the temperature of the air flow is 260 ° C. or less, optionally 250 ° C. or less, optionally 240 ° C. or less.
  • the manufacturing method contains two or more kinds of polyolefins different in the heat of fusion in the thermoplastic resin composition.
  • the thermoplastic resin composition comprises a polyolefin comprising a first polyolefin having a heat of fusion of 94 mJ / mg or more and / or a second polyolefin having a heat of fusion of less than 94 mJ / mg. contains.
  • the second polyolefin is one or more selected from low crystalline polypropylene having MFR 400 g / 10 min or more, low crystalline polypropylene having MFR 400 g / 10 min or less, and polypropylene based elastomer having MFR 400 g / 10 min or less including.
  • the polyolefin comprises one or more selected from homopolymers of alpha-olefins and copolymers of two or more alpha-olefins.
  • the ⁇ -olefin homopolymer includes one or more selected from a high crystalline polyolefin and a low crystalline polyolefin.
  • the copolymer of two or more ⁇ -olefins includes one or more selected from low crystalline olefin elastomers and amorphous olefin elastomers.
  • the first polyolefin comprises a high crystalline polyolefin, and the high crystalline polyolefin has a melt flow rate of 100 g / 10 min or more and / or 2000 g / 10 min or less.
  • the first polyolefin comprises a high crystalline polyolefin, and the high crystalline polyolefin has a melt flow rate of 300 g / 10 min or more and / or 1800 g / 10 min or less.
  • the content of the second polyolefin relative to the total amount of the first polyolefin and the second polyolefin is When the second polyolefin is a low crystalline polypropylene having a MFR of 400 g / 10 min or more, the content is 50 mass% or more and / or 70 mass% or less, When the second polyolefin is a low crystalline polypropylene having a MFR of less than 400 g / 10 min or a polypropylene elastomer having a MFR of less than 400 g / 10 min, the content is 10% by mass or more and / or 15% by mass or less.
  • the manufacturing method further includes a depositing step of depositing the fibers obtained in the spinning step on the collecting surface.
  • the manufacturing method sets the distance between the nozzle and the collection surface to 400 mm or less, optionally 300 mm or less, optionally 150 mm or less, and / or 50 mm or more.
  • the manufacturing method includes a heating step of heating the fibers obtained in the spinning step before the fibers obtained in the spinning step are deposited on the collecting surface.
  • the present invention also provides a meltblown nonwoven fabric produced by the above production method.
  • FIG. 1 is a schematic view showing an example of a SEM image of a meltblown nonwoven fabric according to the present invention.
  • MD direction Machine Direction
  • CD direction CD direction
  • the inventors have found that the strength in the MD direction of the meltblown nonwoven fabric is sufficient but the strength in the CD direction is low. For this reason, in the melt-blown nonwoven fabric, for example, when a tensile load is applied in the CD direction to cause deformation, the distance between the fibers is likely to be extended, and a gap may be generated to significantly reduce the water resistance. In general, when using a meltblown nonwoven fabric at a location where there is a possibility that deformation may occur due to load, a high-strength spunbond nonwoven fabric or air through nonwoven fabric is used so as to cover the meltblown nonwoven fabric.
  • the present invention relates to a meltblown non-woven fabric in which a decrease in water pressure resistance due to deformation is suppressed.
  • the melt-blown nonwoven fabric according to the present invention can suppress a decrease in water pressure resistance due to deformation.
  • the average fiber diameter of the contained fibers is 4 ⁇ m or less.
  • the average fiber diameter is preferably 3.6 ⁇ m or less, more preferably 3.2 ⁇ m or less, still more preferably 3 ⁇ m or less, and particularly preferably 2.5 ⁇ m or less, and is 2 ⁇ m or less. Is particularly preferred.
  • the average fiber diameter is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, and still more preferably 0.3 ⁇ m or more.
  • the average fiber diameter is preferably 0.1 ⁇ m to 4 ⁇ m, more preferably 0.2 ⁇ m to 3.6 ⁇ m, and still more preferably 0.3 ⁇ m to 3.2 ⁇ m.
  • the thickness is more preferably 0.3 ⁇ m or more and 3 ⁇ m or less, particularly preferably 0.3 ⁇ m or more and 2.5 ⁇ m or less, and particularly preferably 0.3 ⁇ m or more and 2 ⁇ m or less.
  • the average fiber diameter of the meltblown nonwoven fabric according to the present invention is calculated as follows. First, using a scanning electron microscope, an SEM image is taken in a field of view where 20 to 60 fibers appear. The fiber diameter is measured once for each of all the fibers in the field of view to obtain an average value. The 10 nm digit of the average value is rounded off to obtain an average fiber diameter. The unit of average fiber diameter is ⁇ m.
  • the melt-blown nonwoven fabric according to the present invention has a first direction along which the melt-blown nonwoven fabric has the highest straightness of fibers and a second direction orthogonal to the first direction.
  • the straightness of the fiber in the first direction and the straightness of the fiber in the second direction are each preferably 35% or more, more preferably 38% or more, and still more preferably 40% or more. Further, it is preferably 90% or less, more preferably 85% or less, and still more preferably 80% or less. Specifically, it is preferably 35% or more and 90% or less, more preferably 38% or more and 85% or less, and still more preferably 40% or more and 80% or less.
  • the first direction is preferably the MD direction at the time of manufacture.
  • the second direction is preferably the CD direction at the time of manufacture. Since the straightness of the fiber in the first direction and the straightness of the fiber in the second direction are both lower than or equal to the lower limit, a gap is formed between the fibers regardless of deformation in either the first direction or the second direction. It becomes difficult to suppress the decrease in water pressure resistance.
  • the direction in which the rectilinear rate of fibers is the highest is taken as the first direction, and the direction orthogonal to the first direction is taken as the second direction.
  • the ratio (A / B) of the rectilinear rate (A) of the fiber in the first direction to the rectilinear rate (B) of the fiber in the second direction is preferably 1 or more, and preferably 2.5 or less, It is more preferably 2.1 or less and still more preferably 1.9 or less.
  • the ratio (A / B) is preferably 1 or more and 2.5 or less, more preferably 1 or more and 2.1 or less, and still more preferably 1 or more and 1.9 or less.
  • the ratio (A / B) is less than or equal to the upper limit, it is difficult to form a gap between the fibers regardless of deformation in either the first direction or the second direction, and a decrease in water pressure resistance is suppressed.
  • the melt-blown nonwoven fabric according to the present invention preferably has a water pressure resistance of 100 mm H 2 O or more, and preferably 10,000 mm H 2 O or less. It is preferable that the water pressure resistance retention rate is 85% or more when the meltblown nonwoven fabric is deformed in a second direction orthogonal to the first direction along the plane of the meltblown nonwoven fabric and in which the rectilinear rate of fibers is the highest. The above is more preferable, 90% or more is more preferable, and 100% or less is realistic.
  • the water pressure resistance retention rate when deformed in the second direction is equal to or higher than this lower limit, so that a gap is formed between fibers regardless of deformation in either the first direction or the second direction. It is hard to be done. For this reason, even if it deform
  • the first direction in which the rectilinear rate of fibers of the melt-blown nonwoven fabric according to the present invention is the highest, the second direction orthogonal to the first direction, and the rectilinear rate (A) of fibers in the first direction and the rectilinear rate of fibers in the second direction (B) can be determined by the following procedures (a) to (g).
  • "the first direction in which the rectilinear rate of fibers is the highest” means the direction determined by the following procedures (a) to (g). It may be different from the high direction.
  • N (0), N (1) and N (2) respectively represent the following.
  • N (0) is the number of fibers continuously extending from one end to the other end of the SEM image
  • N (1) is the number of fibers crossing one end in the long side
  • N (2) is the length in the long side
  • the number of fibers crossing the end The fibers reaching one end in the long side direction of the SEM image are referred to as "fibers crossing at one end in the longitudinal direction". The same applies to the other end.
  • FIG. 1 is a schematic view showing an example of an SEM image in which the long side direction is parallel to the first direction.
  • the fiber is shown as a straight line for simplification of illustration, the actual fiber is not necessarily linear.
  • the number of fibers shown in the SEM image may differ from the actual one. In the case of the SEM image shown in FIG. 1, the number of fibers intersecting the left end in the long side direction is six at intersections a to f, and the number of fibers intersecting the right end in the long side direction is six at intersections g to l It is.
  • the angle ⁇ ° at the time of changing the visual field may be an arbitrary value, preferably 15 ° or less, more preferably 10 ° or less, and further preferably 5 ° or less preferable.
  • the “direction in which the rate of rectilinear movement is highest” may be different due to different conditions such as the observation position and the angle ⁇ . In that case, the direction in which the rate of rectilinear movement is the highest among the plurality of measurement results can be adopted as the first direction.
  • the melt-blown nonwoven fabric according to the present invention has a rectilinear rate of fibers of 35% or more in any of the first direction in which the rectilinear rate of fibers is the highest and the second direction orthogonal to it. Is less likely to occur, and a decrease in water pressure resistance can be suppressed. Furthermore, even if the melt-blown nonwoven fabric according to the present invention is deformed without being laminated with the spun bond nonwoven fabric or the air through nonwoven fabric, the decrease in water pressure resistance is suppressed.
  • the reduction in water pressure resistance due to the deformation of the meltblown nonwoven fabric according to the present invention can be evaluated by the ratio of water pressure resistance after deformation to the water pressure resistance before deformation (water pressure resistance retention rate).
  • the water pressure resistance and the water pressure resistance are measured by the method described later.
  • the meltblown nonwoven may be integrated with a base such as a spunbond nonwoven or an air through nonwoven by heat embossing. The integrated meltblown nonwoven is stretched in an integrated state and then the water pressure resistance is measured. When the melt-blown nonwoven fabric is integrated with the resin film by heat embossing, only the film in the non-embossed area is removed to make the measurement object.
  • the melt-blown nonwoven fabric according to the present invention comprises adjusting the heat of fusion of the thermoplastic resin composition constituting the fiber, adjusting the temperature of the air flow in the spinning step, or heating the fiber before the depositing step after the spinning step. It can be obtained by The temperature of the air flow in the spinning process and the heating of the fibers will be described later.
  • a thermoplastic resin composition is a mixture which contains 1 or more types of thermoplastic resin, and contains other components suitably as needed.
  • the heat of fusion of the thermoplastic resin composition is preferably greater than 5 mJ / mg, more preferably 10 mJ / mg or more, and particularly preferably 20 mJ / mg or more from the viewpoint of spinnability. Further, from the viewpoint of obtaining soft fibers and from the viewpoint of narrowing the fibers in a low temperature hot air temperature range, it is preferably less than 94 mJ / mg, more preferably 90 mJ / mg or less, and 80 mJ / mg or less Is more preferably 75 mJ / mg or less, particularly preferably 45 mJ / mg or less, and particularly preferably 35 mJ / mg or less.
  • the heat of fusion is preferably greater than 5 mJ / mg and less than 94 mJ / mg, more preferably 10 mJ / mg to 90 mJ / mg, and more preferably 20 mJ / mg to 80 mJ / mg. Is more preferably from 20 to 75 mJ / mg, particularly preferably from 20 to 45 mJ / mg, and particularly preferably from 20 to 35 mJ / mg.
  • the heat of fusion is an indicator of the degree of flexibility of the crystalline region of the thermoplastic resin composition.
  • the heat of fusion of the thermoplastic resin composition can be in the desired range by adjusting the thermoplastic resin to be used and the content thereof.
  • the heat of fusion of the thermoplastic resin composition can be obtained by collecting 1 mg of a measurement piece from the central portion of the melt-blown nonwoven fabric, and determining it by the method described later.
  • the heat of fusion is less than the above upper limit, the proportion of amorphous regions present in the fiber increases. As a result, the fibers become soft and the orientation that occurs during the spinning process is suppressed. The orientation of the fibers will be described later. If the heat of fusion is larger than the above lower limit, the fibers become soft and orientation is difficult to occur, while if it is less than the above upper limit, the number of crystal regions present in the fiber is sufficiently large and fusion between the fibers is suppressed And the distance between the fibers can be narrowed to improve the water pressure resistance.
  • the thermoplastic resin composition may contain only a thermoplastic resin whose heat of fusion is within a desired range. Moreover, two or more types of thermoplastic resins having different amounts of heat of fusion may be mixed so that the amount of heat of fusion falls within a desired range. When a plurality of thermoplastic resins are used, the heat of fusion is in the desired range by mixing the thermoplastic resin having the heat heat of fusion above the upper limit of the desired range and the thermoplastic resin of the heat heat of fusion below the lower limit of the desired range. Alternatively, a plurality of thermoplastic resins each having a desired range of heat of fusion may be mixed.
  • thermoplastic resin for example, polyolefin, polyester, polyetheretherketone, polyphenylene sulfide, polyamide and the like can be used. Among them, polyolefin or polyester is preferable, and polyolefin is particularly preferable. If the heat of fusion falls within the desired range, one of these thermoplastic resins may be used alone, or two or more thereof may be used in combination.
  • thermoplastic resin composition is a polyolefin.
  • polyolefin it is more preferable to occupy 80 mass% or more of a thermoplastic resin composition, and it is more preferable to occupy 90 mass% or more.
  • polystyrene resin a homopolymer of ⁇ -olefin or a copolymer of two or more ⁇ -olefins can be used. These may be used alone or in combination of two or more.
  • polyolefin those obtained by copolymerizing ⁇ -olefin with unsaturated carboxylic acid such as acrylic acid, methacrylic acid and maleic acid, ester of these unsaturated carboxylic acids, and acid anhydride can also be used. .
  • the ⁇ -olefin preferably has 2 to 20 carbon atoms, and more preferably 2 to 10 carbon atoms.
  • propylene, ethylene, 1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene and the like are preferable, propylene or ethylene is more preferable, and propylene is most preferable.
  • high crystalline polyolefin or low crystalline polyolefin can be used as a homopolymer of ⁇ -olefin.
  • the highly crystalline polyolefin is a polyolefin having high ⁇ -olefin stereoregularity.
  • Specific examples of the high crystalline polyolefin include high crystalline polypropylene such as isotactic polypropylene and syndiotactic polypropylene; high crystalline polyethylene such as high density polyethylene and medium density polyethylene.
  • the highly crystalline polypropylene generally used for the meltblown nonwoven fabric has a heat of fusion of over 94 mJ / mg, and is a resin having many crystalline regions and being hard.
  • shear flow occurs on the spinning line, and rigid fibers having many crystalline regions tend to be oriented in the direction of the air flow. Since the air stream is blown onto the collecting surface driven in the MD direction, it is considered that the fibers are deposited on the collecting surface while making the orientation direction the same as the MD direction. Therefore, by setting the heat of fusion of the thermoplastic resin composition constituting the fiber to less than 94 mJ / mg, a large number of soft noncrystalline regions exist in the fiber, and the orientation of the fiber according to the shear direction hardly occurs. As a result, it is considered that in the non-woven fabric deposited on the collecting surface, the fiber orientation in the MD direction decreases and the rectilinear rate in the CD direction increases.
  • the heat of fusion of the highly crystalline polyolefin is preferably greater than 94 mJ / mg, more preferably 96 mJ / mg or more, still more preferably 98 mJ / mg or more, and less than 120 mJ / mg. It is preferably 115 mJ / mg or less, more preferably 110 mJ / mg or less, and specifically more than 94 mJ / mg and less than 120 mJ / mg, and preferably 96 mJ / mg to 115 mJ / mg. It is more preferable that it is the following, and it is still more preferable that it is 98 to 110 mJ / mg.
  • the melt flow rate (MFR) (230 ° C.) of the highly crystalline polyolefin is preferably 100 g / 10 min or more, more preferably 300 g / 10 min or more, and 2000 g / 10 min or less Is more preferably 1800 g / 10 min or less, specifically 100 g / 10 min or more and 2000 g / 10 min or less and 300 g / 10 min or more and 1800 g / 10 min or less More preferable.
  • MFR is measured at a temperature of 230 ° C. under a load of 2.16 kg according to JIS K7210.
  • the MFR is less than this upper limit, the fluidity of the resin at the time of the spinning process is not too high, and yarn breakage is suppressed and thin fibers are easily realized.
  • the MFR is at least the lower limit, the resin has fluidity, and the fiber can be sufficiently drawn during the spinning process, and the fiber diameter can be reduced.
  • the high crystalline polyolefin preferably has a weight average molecular weight (Mw) of 5,000 or more, more preferably 10,000 or more, still more preferably 15,000 or more, and preferably 500,000 or less, and 200,000. It is more preferable that it is the following, it is more preferable that it is 150000 or less, and it is specifically preferable that it is 5000 or more and 500000 or less, it is more preferable that it is 10000 or more and 200000 or less, and it is that More preferable.
  • Mw weight average molecular weight
  • the weight average molecular weight is at least the lower limit, the polymer chains are strongly entangled in the spinning process, yarn breakage can be prevented, and thin fibers can be realized.
  • the weight average molecular weight is not more than this upper limit, the entanglement between polymer chains is not too strong, the fiber can be sufficiently drawn during the spinning process, and the fiber diameter can be reduced.
  • the high crystalline polyolefin preferably has a molecular weight distribution (average molecular weight (Mw) / number average molecular weight (Mn)) of 1.1 or more, more preferably 1.5 or more, and 2 or more. Is more preferably 5 or less, more preferably 4 or less, still more preferably 3.5 or less, specifically 1.1 or more and 5 or less, It is more preferably 1.5 or more and 4 or less, and still more preferably 2 or more and 3.5 or less.
  • Mw average molecular weight
  • Mn number average molecular weight
  • the low crystalline polyolefin is a polyolefin having low ⁇ -olefin stereoregularity.
  • Specific examples of the low crystalline polyolefin include low crystalline polypropylene such as atactic polypropylene and low stereoregular polypropylene; low crystalline polyethylene such as low density polyethylene and linear low density polyethylene.
  • the low stereoregular polypropylene is obtained by polymerizing propylene using a known methacone catalyst.
  • the heat of fusion of the low crystalline polyolefin is preferably greater than 0 mJ / mg, more preferably 3 mJ / mg or more, still more preferably 5 mJ / mg or more, and less than 94 mJ / mg. It is more preferably 85 mJ / mg or less, still more preferably 70 mJ / mg or less, specifically more than 0 mJ / mg and less than 94 mJ / mg, preferably 3 mJ / mg to 85 mJ / mg.
  • the content is more preferably 5 mJ / mg or more and 70 mJ / mg or less.
  • the low crystalline polyolefin preferably has MFR (230 ° C.) of 100 g / 10 min or more, more preferably 1000 g / 10 min or more, still more preferably 1800 g / 10 min or more, and 2500 g It is preferably 10 minutes or less, more preferably 2300 g / 10 minutes or less, still more preferably 2100 g / 10 minutes or less, and specifically 100 g / 10 minutes to 2500 g / 10 minutes Is preferably 1000 g / 10 minutes to 2300 g / 10 minutes, and more preferably 1800 g / 10 minutes to 2100 g / 10 minutes. MFR is measured at a temperature of 230 ° C. under a load of 2.16 kg according to JIS K7210.
  • the low crystalline polyolefin preferably has a weight average molecular weight (Mw) of 5,000 or more, more preferably 20,000 or more, still more preferably 30,000 or more, and preferably 150,000 or less, 70,000.
  • Mw weight average molecular weight
  • the following is more preferable, 50000 or less is more preferable, and specifically, 5000 or more and 150000 or less is preferable, 20000 or more and 70000 or less is more preferable, and 30000 or more and 50000 or less More preferable.
  • Copolymers of two or more ⁇ -olefins are low crystalline or amorphous olefin elastomers.
  • a copolymer of ⁇ -olefin a random copolymer, a block copolymer, a graft copolymer or an alternating copolymer can be used.
  • a block copolymer it is preferable that the ⁇ -olefin be bonded by an atactic structure.
  • a copolymer of two or more ⁇ -olefins is referred to as an olefin-based elastomer.
  • the olefin-based elastomer has a heat of fusion greater than 0 mJ / mg and less than 94 mJ / mg, preferably 3 mJ / mg or more, more preferably 5 mJ / mg or more, and 90 mJ / mg or less Is more preferable, and 85 mJ / mg or less is more preferable.
  • the olefin elastomer is at least one member selected from the group consisting of polyene compound units such as butadiene, isoprene, ethylidene norbornene and dicyclopentadiene, cyclic olefin units and vinyl aromatic compound units, as necessary, in addition to ⁇ -olefin May be contained as a monomer.
  • the olefin elastomer examples include, for example, propylene / ethylene copolymer, propylene / ethylene / 1-butene copolymer, propylene / 1-butene copolymer, propylene / ethylene / cyclic olefin copolymer, propylene / Examples thereof include ethylene / butadiene copolymer, propylene / 1-butene / styrene copolymer and the like.
  • a propylene / ethylene copolymer or a propylene / ethylene / 1-butene copolymer is most preferable. One of these may be used alone, or two or more may be used in combination.
  • the olefin elastomer preferably has an MFR (230 ° C.) of 10 g / 10 min or more, more preferably 300 g / 10 min or more, and preferably 2000 g / 10 min or less, 1800 g / 10 min. More preferably, it is less than a minute. MFR is measured at a temperature of 230 ° C. under a load of 2.16 kg according to JIS K7210.
  • the olefin elastomer preferably has a molecular weight distribution (weight-average molecular weight (Mw) / number-average molecular weight (Mn)) of 1.1 or more, more preferably 1.3 or more, and 1.5 or more. Some are more preferable, and 5 or less is preferable, 4 or less is more preferable, and 3.5 or less is more preferable.
  • Mw weight-average molecular weight
  • Mn number-average molecular weight
  • the olefin-based elastomer can be produced using a polymerization catalyst such as a known Ziegler-Natta type catalyst or a single site catalyst (for example, a metallocene type catalyst).
  • a polymerization catalyst such as a known Ziegler-Natta type catalyst or a single site catalyst (for example, a metallocene type catalyst).
  • the thermoplastic resin composition preferably contains a high crystalline polyolefin and a low crystalline polyolefin or a polyolefin-based elastomer.
  • the thermoplastic resin composition preferably contains a mixture of a first polyolefin whose heat of fusion is 94 mJ / mg or more and a second polyolefin whose heat of fusion is less than 94 mJ / mg.
  • the thermoplastic resin composition is generally a high crystalline polypropylene having a heat of fusion of 94 mJ / mg or more and a low crystalline polypropylene of a heat of fusion of less than 94 mJ / mg. It is particularly preferred to contain a mixture with a polypropylene-based elastomer.
  • the second polyolefin examples include high fluidity low crystalline polypropylene having MFR 400 g / 10 min or more, low fluidity low crystalline polypropylene having MFR 400 g / 10 min or less, and low fluidity MFR 400 g / 10 min Polypropylene-based elastomers can be mentioned.
  • the content of high fluidity low crystalline polypropylene having MFR of 400 g / 10 min or more is preferably 90% by mass or less, more preferably 80% by mass or less, of the entire thermoplastic resin composition, and 70% by mass It is more preferable that it is the following.
  • the content of the low crystalline polypropylene having high fluidity is preferably 3% by mass or more, more preferably 10% by mass or more, further preferably 20% by mass or more, and 50% by mass or more. In particular, it is preferably 3% by mass to 90% by mass, more preferably 10% by mass to 80% by mass, and particularly preferably 20% by mass to 70% by mass. Is more preferable, and 50 to 70% by mass is particularly preferable.
  • the content of the low crystalline polypropylene having high fluidity is not more than this upper limit, the number of amorphous regions in the fiber is not too large, the fusion between the fibers is suppressed, the distance between the fibers is narrowed, and the water pressure resistance Can be improved.
  • the content of the low crystalline polypropylene having high fluidity is not less than this lower limit, the amorphous region in the fiber is sufficiently present to be soft, and orientation becomes difficult to occur during the spinning process.
  • the content of the low crystalline polypropylene having an MFR of less than 400 g / 10 min or the polypropylene elastomer having an MFR of less than 400 g / 10 min is preferably 30% by mass or less of the entire thermoplastic resin composition, and is less than 30% by mass. More preferably, it is more preferably 20% by mass or less, and particularly preferably 15% by mass or less.
  • the content of the polypropylene-based elastomer is preferably 3% by mass or more, more preferably 5% by mass or more, particularly preferably 10% by mass or more, particularly preferably 20% by mass or more Specifically, it is preferably 3% by mass to 30% by mass, more preferably 3% by mass to less than 30% by mass, still more preferably 5% by mass to 20% by mass, and 10 It is particularly preferable that the content is not less than 20% by mass, particularly preferably not less than 20% by mass and not more than 15% by mass, and most preferably 10% by mass to 15% by mass.
  • low crystalline polypropylene having a MFR of less than 400 g / 10 min and polypropylene-based elastomer having a MFR of less than 400 g / 10 min have lower fluidity than a polypropylene resin for melt blowing.
  • the content is less than this upper limit, the flowability of the entire resin is increased, the fibers can be sufficiently drawn during the spinning process, and the fiber diameter becomes thin.
  • the content of the low crystalline polypropylene having a MFR of less than 400 g / 10 min and the polypropylene elastomer having a MFR of less than 400 g / 10 min is in the above range. It is preferably inside.
  • a high crystalline polypropylene is mentioned as a specific example of a 1st polyolefin.
  • the compounding ratio (first polypropylene / second polypropylene) of the first polypropylene and the second polypropylene on a mass basis is selected according to the type.
  • Mopren (registered trademark) HP 461Y (manufactured by Lyondellbasell) is used as the first polypropylene (high crystalline polypropylene), and an L-MODU of MFR 2600 g / 10 min as the second polypropylene (high flowability low crystalline polypropylene)
  • the blending ratio thereof is preferably 5/95 or more, more preferably 10/90 or more, and 20/80 or more. More preferably, it is particularly preferably 30/70 or more, and it is preferably 97/3 or less, more preferably 90/10 or less, still more preferably 80/20 or less, and 50/70.
  • the ratio is 50 or less, specifically, larger than 5/95 It is preferably 97/3 or less, more preferably 10/90 or more and 90/10 or less, still more preferably 20/80 or more and 80/20 or less, and 30/70 or more and 50/50 or less. Is particularly preferred.
  • low fluidity low crystalline polypropylene that can be used as the second polypropylene
  • a propylene-based elastomer which can be used as the second polypropylene for example, Tafresen (registered trademark) H5002 (manufactured by Sumitomo Chemical Co., Ltd.) can be mentioned.
  • the compounding ratio (first polypropylene / second polypropylene) is 70/30 or more. Is preferably 75/25 or more, more preferably 80/20 or more, particularly preferably 85/15 or more, and preferably 97/3 or less. 95/5 or less is more preferable, 90/10 or less is more preferable, and specifically 70/30 or more and 95/5 or less is preferable, and 75/25 or more and 95/5 or less Is more preferably 80/20 or more and 90/10 or less, and 8 / It is especially preferably 15 to 90/10.
  • polyester for example, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate and the like can be used. Among them, polyethylene terephthalate or polybutylene terephthalate is preferred. When plural types of polyesters are mixed and used, it is preferable that one of the polyesters is 50% by mass or more of the total polyester, more preferably 70% by mass or more, and further preferably 90% by mass or more. preferable.
  • polyamide 3 polyamide 4, polyamide 6, polyamide 66, polyamide 12 and the like can be used.
  • the thermoplastic resin composition is a nucleating agent, a matting agent, a pigment, a dye, an antifungal agent, an antibacterial agent, a flame retardant, a hydrophilic agent, a light stabilizer, an antioxidant, to the extent that the effects of the present invention are not impaired.
  • You may contain additives, such as an antiaging agent, a synthetic oil, a wax, a coloring inhibitor, and a viscosity modifier.
  • the filling ratio of the melt-blown nonwoven fabric according to the present invention is preferably 3% or more, more preferably 5% or more, and still more preferably 6% or more.
  • the filling rate is larger, the fibers are more densely present, and the water pressure resistance of the melt-blown nonwoven fabric becomes larger. The higher the filling rate, the harder the meltblown nonwoven, and the lower it is softer.
  • the filling rate is preferably 30% or less, more preferably 20% or less, and still more preferably 15% or less because softness is preferred.
  • the melt-blown nonwoven fabric according to the present invention preferably has a filling rate of 3% to 30%, more preferably 5% to 20%, and more preferably 6% to 15%. More preferable.
  • the packing ratio can be made to be more than the above-mentioned lower limit by compacting the fibers by the wind pressure of the air flow by setting the distance from the nozzle of the nonwoven fabric manufacturing device described later to the collecting surface to 400 mm or less. Moreover, a melt-blown nonwoven fabric can be compressed at the time of manufacture using a calender roll etc., and a filling rate can also be adjusted more than said lower limit.
  • a thickness is set in a state where a load of 4 kPa is applied to the melt-blown nonwoven fabric using a laser displacement meter made by OMRON Corporation with respect to the nonwoven fabric obtained by the method described later taking measurement. According to the method mentioned later, a filling rate is calculated
  • the melt-blown nonwoven fabric according to the present invention preferably has a formation index of 300 or less, more preferably 280 or less, still more preferably 260 or less, and particularly preferably 250 or less. Is particularly preferred.
  • the formation index can be made equal to or less than the above-described upper limit by setting the distance from the nozzle of the nonwoven fabric manufacturing apparatus described later to the collection surface to 400 mm or less and suppressing the occurrence of unevenness in fiber deposition.
  • the formation index is practically as small as about 30 when producing a non-woven fabric by the melt-blowing method. As the formation index is smaller, the fibers are uniformly present, and the water pressure resistance of the melt-blown nonwoven fabric becomes larger.
  • the measurement of the formation index is carried out using the method which will be described later, at any position in the longitudinal direction and at the center of the meltblown nonwoven fabric in the lateral direction.
  • melt-blown nonwoven fabric integrated by heat embossing with base materials may peel when peeling off and obtaining a sample.
  • the formation index is calculated using the standard deviation of the absorbance and the mean value after subtraction of the absorbance E derived from the holes.
  • the melt-blown nonwoven fabric according to the present invention preferably has a basis weight of 20 g / m 2 or less, more preferably 15 g / m 2 or less, and more preferably 10 g / m 2 from the viewpoint of setting the filling rate and the formation index to the above range. More preferably, it is m 2 or less.
  • the basis weight is not more than this upper limit, the volume of fibers to the air pressure of the air flow is reduced, so that consolidation becomes easy, and the filling rate becomes sufficient.
  • the basis weight is below the upper limit, uniform deposition is performed in the deposition step, and the formation index is sufficient.
  • Basis weight for meltblown nonwoven express water pressure 1 g / m 2 or more preferably, 2 g / m 2 or more is more preferable.
  • the basis weight of melt-blown nonwoven fabric according to the present invention is preferably 1 g / m 2 or more 20 g / m 2 or less, 1 g / m 2 or more 15 g / m 2 or less, 2 g / More preferably, it is m 2 10 g / m 2 or less.
  • the basis weight can be measured from the weight per area of 0.05 m.
  • a melt-blown nonwoven fabric is bonded to a resin film, paper, a base material such as a spunbond nonwoven fabric, or an air-through nonwoven fabric by a hot melt or the like to form a composite
  • the hot melt is first heated by cold spray or a dryer.
  • the adhesion is reduced and the meltblown nonwoven is peeled off from the substrate.
  • the hot melt adhered to the meltblown nonwoven is dissolved by soaking the meltblown nonwoven for 24 hours in a large excess of an organic solvent such as toluene in which the hot melt is soluble.
  • the meltblown nonwoven fabric removed from the organic solvent is dried, and the basis weight of the meltblown nonwoven fabric is measured by the above method.
  • the method of taking out the melt-blown nonwoven fabric from the composite is also applied to other measurements in the present specification.
  • the meltblown nonwoven fabric is integrated with a resin film, a spunbond nonwoven fabric, a base material such as an air through nonwoven fabric by heat embossing, the meltblown nonwoven fabric is first peeled off so as to remove the embossed portion.
  • the area of the melt-blown nonwoven fabric in a state in which the holes of the embossed portion are open may be obtained from image processing such as binarization, and the basis weight may be measured from the weight at that time.
  • melt-blown nonwoven fabric of 0.05 m square area to be subjected to measurement of basis weight be obtained from a continuous melt-blown nonwoven fabric.
  • the area of one melt-blown nonwoven fabric obtainable from a product is small, it can be the sum of the areas of a plurality of melt-blown nonwoven fabrics obtained from the same product.
  • meltblown non-woven fabric When the meltblown non-woven fabric is integrated with a resin film, a spunbond non-woven fabric, an air-through non-woven fabric, or the like by heat embossing, it does not include the embossed portion except for the measurement of water pressure and the measurement of water pressure after deformation as described later. As described above, the meltblown non-woven fabric is appropriately peeled off to make a measurement target.
  • the melt-blown nonwoven fabric according to the present invention has an average fiber diameter of 4 ⁇ m or less, and along a plane, in the first direction in which the rectilinear rate of fibers is the highest and in the second direction orthogonal to the first direction. Since the straightness rate of the fibers is 35% or more in any case, the water pressure resistance is excellent, and even if deformation occurs, it is difficult to form a gap between the fibers, and a decrease in water pressure resistance can be suppressed.
  • the water pressure resistance of the meltblown nonwoven fabric can be measured by obtaining the meltblown nonwoven fabric by the same means as described above. However, when the meltblown nonwoven fabric is integrated with a substrate such as a spunbond nonwoven fabric or an air through nonwoven fabric by heat embossing, the water pressure resistance is measured as it is, and the value is taken as the water pressure resistance of the meltblown nonwoven fabric.
  • the fine melt-blown non-woven fabric is a layer that determines the water pressure resistance, so the water pressure resistance of the entire laminated non-woven fabric can be regarded as the water pressure resistance of the melt-blown non-woven fabric.
  • melt-blown nonwoven fabric according to the present invention is not particularly limited, and can be used for various applications by taking advantage of its characteristics.
  • the melt-blown nonwoven fabric according to the present invention can be used as a single layer or as a laminate, and a plurality of melt-blown nonwoven fabrics according to the present invention may be laminated, together with other known nonwoven fabrics such as spunbonded nonwoven fabric and air through nonwoven fabric. It may be stacked.
  • the melt-blown nonwoven fabric according to the present invention may be embossed if necessary.
  • the spun bond layer and the meltblown layer may be laminated and integrated by heat embossing.
  • a spunbond nonwoven separately prepared meltblown nonwoven can be laminated and embossed.
  • the meltblown nonwoven and the spunbonded nonwoven may be separately manufactured and integrated by heat embossing.
  • the basis weight can be measured by appropriately peeling off the meltblown nonwoven fabric so as not to include the embossed portion in the same manner as described above.
  • the melt-blown nonwoven fabric according to the present invention can be used as a component of absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads, for example, and a drop in water pressure resistance due to deformation is suppressed. Is suitable as a leak-proof sheet.
  • Such an absorbent article can be manufactured by laminating the leak-barrier sheet, the absorber and the top sheet, which are made of the melt-blown nonwoven fabric according to the present invention.
  • the melt-blown non-woven fabric according to the present invention can also be used for sanitary masks, liquid filters, air filters, battery separators, gloves and the like.
  • the melt-blown nonwoven fabric according to the present invention can be manufactured by a melt-blowing method using a known nonwoven fabric manufacturing apparatus conventionally used for manufacturing a melt-blown nonwoven fabric.
  • the nonwoven fabric manufacturing apparatus deposits, for example, an extruder provided with a barrel incorporating a screw and a raw material feeding part, a die connected directly to the extruder or via a gear pump and the like, and a fibrous melt And a collection surface.
  • a plurality of nozzles for discharging the melt are arranged in series in the die, and blowout ports are provided on both sides of each nozzle, and a high temperature / high pressure air stream (hot air) is jetted from the blowout port to melt the melt discharged from the nozzles
  • the product is stretched to form a fiber.
  • the plurality of nozzles are preferably arranged in series at regular intervals.
  • the bore diameter of the nozzle is preferably several hundred ⁇ m.
  • the high temperature and high pressure gas flow is preferably an air flow, but may be a gas flow of another gas.
  • As the collecting surface a known one such as a net conveyor or a collecting screen can be used.
  • the method for producing a melt-blown nonwoven fabric according to the present invention is a method for producing a melt-blown nonwoven fabric having an average fiber diameter of 4 ⁇ m or less, for example, supplying a thermoplastic resin composition in the form of pellets from an input portion into an extruder After heating and melting in the machine, the melt is supplied to a die and discharged from a nozzle, and the discharged melt is drawn by a stream (hot air) of high temperature and high pressure to form a fibrous form. The fibrous melt is deposited on the collecting surface in the deposition step, and the fibers are fused together to form a meltblown nonwoven fabric.
  • thermoplastic resin composition can be used as a thermoplastic resin composition used in the manufacturing method of the melt blow nonwoven fabric concerning the present invention.
  • the thermoplastic resin composition may be prepared by directly charging the thermoplastic resin and the component to be optionally blended into the extruder instead of the pellet.
  • the temperature (hot air temperature) of the air flow in the spinning step is 260 ° C. or less, preferably 250 ° C. or less, and more preferably 240 ° C. or less.
  • the temperature of the air flow becomes equal to or lower than this upper limit, the time for which the fibers have tackiness is shortened, entanglement of the fibers is less likely to occur, the air resistance of the fibers is suppressed, and it is difficult to orient in the MD direction in the spinning process, It is considered that the linear movement rate of the fiber in the CD direction is high.
  • the lower limit of the temperature of the air flow needs to be equal to or higher than the melting point of the thermoplastic resin composition.
  • the melting point is measured by differential scanning calorimetry (DSC), a DSC curve is obtained while raising the temperature from 30 ° C. to 20 ° C./min, and the temperature at the highest endothermic peak point appearing at 30 to 240 ° C. Let it be the melting point.
  • DSC differential scanning calorimetry
  • the thermoplastic resin composition preferably contains highly crystalline polypropylene.
  • the hot air temperature is preferably 160 ° C. or higher, which is the melting point of highly crystalline polypropylene, more preferably 180 ° C. or higher, and still more preferably 200 ° C. or higher.
  • the hot air temperature is preferably 160 ° C. or more and 260 ° C. or less, more preferably 180 ° C. or more and 250 ° C. or less, and still more preferably 200 ° C. or more and 240 ° C. or less.
  • the flow rate of the air flow and air flow width 1m per 500 Nm 3 / hr or more to be blown in the spinning process 700 Nm 3 / hr or more and It is more preferable to do.
  • it is preferable to set the flow rate of the air flow to 1700 Nm 3 / hr or less per 1 m width of the air flow, 1300 Nm 3 / hr It is more preferable to set it as the following.
  • the distance from the nozzle of the nonwoven fabric production apparatus to the collection surface is preferably 400 mm or less, more preferably 300 mm or less, and still more preferably 150 mm or less.
  • the distance from the nozzle to the collecting surface is equal to or less than the upper limit, it is considered that the fibers can be densely deposited and the water pressure resistance is improved.
  • the molten fibers can be cooled and deposited to prevent coalescence of the molten fibers and improve the water pressure resistance.
  • the fibers are cooled when the fibers are deposited, and the distance from the nozzle to the collection surface is preferably 50 mm or more, preferably 50 mm or more, more preferably 80 mm or more, and still more preferably 100 mm or more.
  • the method for producing a melt-blown nonwoven fabric according to the present invention preferably includes a heating step of heating the fibers after the spinning step and prior to the deposition step in which the fibers are deposited on the collecting surface.
  • a heating step it is preferable to use an IR heater instead of hot air from the viewpoint that it is preferable to apply heat only to the fibers without giving disturbance such as wind.
  • the position to heat the fibers is preferably 100 mm or more below the nozzle from the viewpoint of preventing the fibers discharged from the nozzle from cooling and solidifying in the spinning space, and preferably 200 mm or less .
  • the position to heat the fiber is preferably 80 mm or more, more preferably 100 mm or more, and preferably 200 mm or less, preferably 180 mm or less in the direction perpendicular to the spinning line. It is more preferable that
  • the temperature of air flow in the spinning step is 260 ° C. or less, and the heat of fusion of the thermoplastic resin composition constituting the fiber is more than 5 mJ / mg and less than 94 mJ / mg Because of this, it is possible to obtain a meltblown nonwoven fabric in which the straightness of the fibers in the CD direction is 35% or more.
  • Resins used as raw materials of the thermoplastic resin composition in Examples 1 to 11 and Comparative Examples 1 to 4 are as follows.
  • Resin 1 Polypropylene (Moplen (registered trademark) HP461Y manufactured by Lyondellbasell), heat of fusion 98 mJ / mg, MFR 1300 g / 10 min, melting point 160 ° C.
  • L-MODU Low crystalline polypropylene
  • melt-blown nonwoven fabric used in Comparative Examples 5 and 6 is as follows.
  • Non-woven fabric 1 Melt-blown non-woven fabric (PC 0009) manufactured by Kurare Kura Flex Co., Ltd.
  • Non-woven fabric 2 Made by Tapyrus Co., Ltd.
  • thermoplastic resin composition The heat of fusion of the thermoplastic resin composition was measured by differential scanning calorimetry (DSC). The DSC curve was obtained while raising the temperature from 30 ° C. to 20 ° C./min, and the heat quantity at the endothermic peak appearing at 100 to 200 ° C. was defined as the heat of fusion.
  • the basis weight of the melt-blown nonwoven fabric is obtained by cutting out three square measurement pieces 50 mm square from the central portion of the melt-blown nonwoven fabric, measuring the mass (g) of the measurement pieces, and measuring the area (m) of the measurement pieces 2 ) Divided by 3 and made the arithmetic average value of 3 sheets the basis weight.
  • the filling rate of the meltblown non-woven fabric can be calculated by the following equation (2).
  • the thickness of the melt-blown non-woven fabric was measured using a laser displacement meter made by OMRON Corporation in a state where a load was applied so that a pressure of 4 kPa was applied. The thickness was measured five times each, and the average value was calculated to determine the thickness of the meltblown nonwoven fabric.
  • the fiber density was measured by the method described in JIS K 7112, specifically, the pycnometer method.
  • the formation index of the meltblown non-woven fabric was calculated using a formation measuring machine (FMT-MIII) manufactured by Nomura Shoji Co., Ltd. Specifically, when a sample of melt-blown non-woven fabric is placed on a sample table, the height of the CCD camera is 26 cm, the effective size is 10 cm ⁇ 10 cm, and the moving average ⁇ pixel is 1, light is irradiated from one side of the sample Take a transmission image of the image with a CCD camera. The effective size of 10 cm ⁇ 10 cm was decomposed into 320 ⁇ 230 pixels, the light intensity received by each pixel was measured, and the transmittance T for each pixel was calculated by the following equation (3).
  • V T is the transmitted light amount when lit (with sample)
  • V R is the transmitted light amount when unlit (with sample)
  • V 100 is the transmitted light amount when lit (without sample)
  • V 0 is not lit (sample None) transmitted light amount.
  • the absorbance E was calculated by the following equation (4).
  • the formation index was calculated by the following formula (5). The measurement was performed on three test pieces, and the average value was taken as the sample formation index. If the size of the sample is small and the size of 10 cm ⁇ 10 cm can not be obtained as the effective size, place the sample at the center of the test stand and make the effective size smaller than the size of the sample and as wide as possible. By setting appropriately and performing measurement, the formation index of the sample can be determined.
  • Average fiber diameter For measurement of the average fiber diameter, first, five small-piece samples were randomly taken from the melt-blown nonwoven fabric. Next, using a tabletop scanning electron microscope (JCM-6000 Plus) manufactured by JEOL Ltd., an SEM photograph was taken, in which 20 to 60 fibers were visible in the field of view. The fiber diameter was measured once for each of all the fibers in the field of view to obtain an average value, and the value obtained by rounding off the 10 nm of the average value was taken as the fiber diameter of the small sample. The fiber diameter was similarly measured about five small pieces of samples, and the average value of five was made into the average fiber diameter of the melt-blown nonwoven fabric.
  • JCM-6000 Plus tabletop scanning electron microscope
  • the water resistance was measured in accordance with the water resistance test (hydrostatic pressure method) A (low water pressure method) of JIS L1092-1998. At the time of the water resistance test, measurement was performed by overlapping a nylon mesh sheet (pore size: 133 ⁇ m, thickness: 121 ⁇ m, manufactured by Kurashiki Spinning Co., Ltd., DO-ML-20) on the test piece. In addition, when the size of a test piece does not satisfy a regulation, the apparatus which reduced the measurement area so that water may contact the test piece of the area which can be extract
  • a melt-blown nonwoven fabric according to Example 1 was manufactured using the thermoplastic resin composition.
  • the production conditions of the meltblown nonwoven fabric according to Example 1 were as follows. The manufacturing conditions are shown in Table 1. Resin temperature (temperature when discharging from the nozzle): 270 ° C Single-hole discharge amount: 0.20 g / min / hole Hot air flow: 300 Nm 3 Hot air blowout width 400mm Hot air temperature (temperature of air flow in spinning process): 200 ° C.
  • Nozzle diameter 0.15 mm
  • nozzle length 3 mm
  • nozzle pitch 0.85 mm
  • Distance from nozzle to collection surface 300 mm
  • various physical properties of the meltblown nonwoven fabric according to Example 1 were measured by the methods (1) to (9) above, and the results are shown in Table 2.
  • Examples 2 to 11, Comparative Examples 1 to 4 Melt-blown non-woven fabrics according to Examples 2 to 11 and Comparative Examples 1 to 4 were produced in the same manner as in Example 1 except that the resin type, compounding ratio and production conditions were changed as shown in Table 1. The manufacturing conditions not described in Table 1 are the same as in Example 1. Further, in the same manner as in Example 1, various physical properties of melt-blown nonwoven fabrics according to Examples 2 to 11 and Comparative Examples 1 to 4 were measured, and the results are shown in Table 2.
  • Example 12 The center of the short wavelength infrared heater (model number IRMA 900/160) manufactured by Heraeus is located at a position of 150 mm below the nozzle and 120 mm away from the nozzle using Resin 1. The output is 100%. Heating was performed at a total output of 9000 W). The other manufacturing conditions were the same as in Example 1 to produce a meltblown nonwoven fabric according to Example 12. Further, in the same manner as Example 1, various physical properties of the obtained meltblown nonwoven fabric were measured, and the results are shown in Table 2.
  • the meltblown nonwoven fabrics according to Examples 1 to 12 have a mean fiber diameter of 4 ⁇ m or less, and a first direction in which the rectilinear rate of fibers is the highest and a second direction orthogonal to the first direction. Since the straightness of the fiber is 35% or more, or the average fiber diameter is 4 ⁇ m or less, the ratio of the straightness of the fiber in the first direction to the straightness of the fiber in the second direction in the plane of the meltblown nonwoven fabric is 2 Since it is less than or equal to .5, it can be seen that the water pressure resistance is high, and the decrease in water pressure resistance due to deformation is suppressed.

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  • Nonwoven Fabrics (AREA)
  • Filtering Materials (AREA)

Abstract

Ce non-tissé obtenu par fusion-soufflage a un diamètre moyen de fibre inférieur ou égal à 4 µm. Dans une première direction qui est dans le plan du non-tissé obtenu par fusion-soufflage et présente le pourcentage le plus élevé de fibres à déplacement rectiligne et dans une seconde direction qui est orthogonale à la première direction, le pourcentage de fibres à déplacement rectiligne est d'au moins 35 %.
PCT/JP2018/046653 2017-12-21 2018-12-18 Non-tissé obtenu par fusion-soufflage WO2019124408A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
MYPI2020003174A MY188653A (en) 2017-12-21 2018-12-18 Meltblown non-woven fabric
KR1020207018580A KR102233538B1 (ko) 2017-12-21 2018-12-18 멜트 블로 부직포
RU2020123901A RU2754413C1 (ru) 2017-12-21 2018-12-18 Нетканый материал мелтблаун
EP18890630.9A EP3730685B1 (fr) 2017-12-21 2018-12-18 Non-tissé obtenu par fusion-soufflage
CN201880082713.3A CN111527254B (zh) 2017-12-21 2018-12-18 熔喷无纺布

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JP2017244951 2017-12-21
JP2017-244951 2017-12-21
JP2018215397A JP6771012B2 (ja) 2017-12-21 2018-11-16 メルトブロー不織布
JP2018-215397 2018-11-16

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Publication number Priority date Publication date Assignee Title
CN115012118A (zh) * 2022-06-30 2022-09-06 武汉纺织大学 一种低熔指聚丙烯熔喷纤维无纺布的制备方法

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