Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/78—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products
  • D01F6/84—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolycondensation products from copolyesters
• • 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
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/435—Polyesters

Definitions

• fatty acid amides examples include fatty acid monoamides and bisamides.
• the fatty acid (fatty acid portion) constituting the fatty acid amide preferably has 12 to 30 carbon atoms, more preferably 12 to 30 carbon atoms, so that the resin composition has a moderately high melting point and suppresses deterioration in processability during melt processing. has 18-22 carbon atoms.
• the preheating temperature of the drawn filaments is more preferably 50 to 110°C, even more preferably 55 to 100°C, even more preferably 60 to 90°C.
• the stuffing box pressure (also referred to as stuffing pressure) is more preferably 0.001 to 0.08 MPa, even more preferably 0.001 to 0.04 MPa.
• the nip pressure during crimping is not particularly limited and may be set as appropriate, and may be, for example, 0.1 to 0.4 MPa (1.0 to 4.0 kg/cm 2 ).
• the conveying speed of the drawn filaments is not particularly limited, and may be 5 to 100 m/min.
• the biodegradable nonwoven fabric should have a weight loss rate (degradation rate) of 30% or more after being buried in soil at a temperature of 25 ° C or higher for 4 weeks. is preferred, 40% or more is more preferred, and 50% or more is even more preferred.
• the weight loss rate (decomposition rate) after burying in the soil at a temperature of 25 ° C. or higher for 2 weeks is preferably close to 100%, but from the viewpoint of practicality, 90% or less, 80% or less, or 70%. It can be below.
• the biodegradable nonwoven fabric has excellent tensile strength and texture, has a low water absorption rate, and has quick drying properties, so it is suitable for various materials such as industrial materials, living materials, and agricultural materials.
• household goods such as industrial filters, filters for home appliances and households such as air conditioner filters, batting for clothing, shoe insoles, kitchen sponges, non-woven wipes, and air freshener carriers that may get wet with water. etc. can be widely used.
• the single fiber tensile strength of drawn filaments was measured based on JIS L 1013:2021, and the single fiber tensile strength of short fibers was measured based on JIS L 1015:2021.
• 20 single fibers are arbitrarily selected from drawn filaments or short fibers, and each single fiber is measured at a tensile speed of 20 mm/
• the load at the time of cutting was measured under the conditions of a load cell having a load cell of 20 mm between grips and a rated capacity of 5 N, and the values were averaged to obtain the single fiber tensile strength.
• Weight reduction rate (%) (W3 - W4) / W3 x 100 (2)
• W3 is the dry weight of the sample before being buried in the soil
• W4 is the dry weight of the sample after being buried in the soil for a predetermined period of time.
• Example 1 ⁇ Production of short fibers> As P3HB3HH, 100 parts by weight of a copolymer resin (manufactured by Kaneka Corporation) having a molar composition ratio of 3HB units/3HH units of 94/6, Mw of 350,000, and MFR (165°C, 5 kg) of 12 g/10 min. , 1.0 parts by weight of pentaerythritol (manufactured by Nippon Synthetic Chemical Co., Ltd., "Neurizer P") as a crystal nucleating agent, and 0.5 parts by weight of erucic acid amide and 0.5 parts by weight of behenic acid amide as lubricants.
• a copolymer resin manufactured by Kaneka Corporation
• Mw molar composition ratio of 3HB units/3HH units of 94/6, Mw of 350,000, and MFR (165°C, 5 kg) of 12 g/10 min.
• pentaerythritol manufactured by Nippon Synthetic Chemical Co., Ltd.
• the obtained pellet-shaped resin composition had a glass transition temperature of 2° C., a crystallization temperature of 100° C., a melting point of 146° C., a thermal decomposition temperature of 180° C., and a weight average molecular weight of 350,000.
• the glass transition temperature, crystallization temperature, melting point and thermal decomposition temperature of the pellet-shaped resin composition were measured by differential scanning calorimetry, and the weight-average molecular weight of the pellet-shaped resin composition was measured using a chloroform eluent.
• the resulting resin composition (pellets) was melted with a kneading extruder (single-screw extruder, screw diameter 25 mm).
• the obtained melt was discharged from a spinning nozzle (temperature: 175°C, shape of discharge hole: circular, diameter of discharge hole: 0.3 mm, number of discharge holes: 368) to obtain a spun filament.
• the melt flow rate was adjusted to 2.6 kg/h with a gear pump.
• air of 20° C. was blown at a speed of 0.7 m/s to the spun filaments discharged from the circumferential direction.
• the cooled spun filament is taken up by the first take-up roll section (speed: 448 m/min), conveyed in order by the first to fourth transfer roll sections (speed: 471 m/min), and then wound into the first roll. It was taken up by a take-up roll (speed: 461 m/min) and stored at room temperature (5 to 35°C) for 18 hours.
• Example 2 P3HB3HH short fibers were produced in the same manner as in Example 1, except that the flow rate of the melt in obtaining the spun filaments was 3.9 kg/h using a gear pump, and the short fibers were used. A needle-punched nonwoven fabric was produced in the same manner as in Example 1.
• Example 3 P3HB3HH short fibers were produced in the same manner as in Example 1, except that the flow rate of the melt when obtaining the spun filaments was 4.9 kg/h using a gear pump, and the short fibers were used.
• a needle-punched nonwoven fabric was produced in the same manner as in Example 1.
• Example 4 P3HB3HH short fibers were produced in the same manner as in Example 1 except that the flow rate of the melt in obtaining the spun filaments was set to 8.5 kg/h using a gear pump and the stuffing pressure was set to 0.05 MPa. A needle-punched nonwoven fabric was produced in the same manner as in Example 1, except that the fibers were used.
• Example 5 P3HB3HH staple fibers were produced in the same manner as in Example 1, except that the flow rate of the melt in obtaining the spun filaments was 26.9 kg/h using a gear pump and the stuffing pressure was 0.06 MPa.
• a needle-punched nonwoven fabric was produced in the same manner as in Example 1, except that the fibers were used.
• Example 2 An attempt was made to produce a nonwoven fabric in the same manner as in Example 1, except that 100% by weight of polypropylene fiber (single fiber fineness 3.3 dtex, fiber length 51 mm) was used. A nonwoven fabric could not be produced because resistance was applied and uniform penetration was not possible.
• the present invention is not particularly limited and may include, for example, one or more of the following embodiments.
• the poly-(3-hydroxybutyrate-co-3-hydroxyhexanoate) staple fiber has a fiber length of 11 to 160 mm and is crimped, and is a biodegradable nonwoven fabric.
• the biodegradable nonwoven fabric according to [1] which has a water absorption rate of 100% or less.
• the poly-(3-hydroxybutyrate-co-3-hydroxyhexanoate) short fibers are , containing 0.05 to 12 parts by weight of a crystal nucleating agent, the biodegradable nonwoven fabric according to any one of [1] to [7].
• the poly-(3-hydroxybutyrate-co-3-hydroxyhexanoate) short fibers are added to 100 parts by weight of poly-(3-hydroxybutyrate-co-3-hydroxyhexanoate) , the biodegradable nonwoven fabric according to any one of [1] to [9], containing 0.05 to 12 parts by weight of a lubricant.
• the biodegradable nonwoven fabric according to [10] wherein the nucleating agent is fatty acid amide.
• a method for producing a biodegradable nonwoven fabric under the condition of a stuffing pressure of 14 MPa [13] The biodegradation according to [12], wherein the poly-(3-hydroxybutyrate-co-3-hydroxyhexanoate) drawn filament has a single fiber tensile strength of 0.5 to 10 cN/dtex.
• a method for producing a flexible nonwoven fabric

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• General Chemical & Material Sciences (AREA)
• Nonwoven Fabrics (AREA)

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Citations (5)

• 2023
  • 2023-02-16 JP JP2024501428A patent/JPWO2023157915A1/ja active Pending
  • 2023-02-16 WO PCT/JP2023/005433 patent/WO2023157915A1/ja not_active Ceased

Patent Citations (5)

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