WO2021135085A1 - 一种再生聚酯长丝及其制备方法 - Google Patents

一种再生聚酯长丝及其制备方法 Download PDF

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Publication number
WO2021135085A1
WO2021135085A1 PCT/CN2020/095729 CN2020095729W WO2021135085A1 WO 2021135085 A1 WO2021135085 A1 WO 2021135085A1 CN 2020095729 W CN2020095729 W CN 2020095729W WO 2021135085 A1 WO2021135085 A1 WO 2021135085A1
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WIPO (PCT)
Prior art keywords
recycled polyester
section
shaped
cross
spinneret holes
Prior art date
Application number
PCT/CN2020/095729
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English (en)
French (fr)
Inventor
范红卫
王山水
王丽丽
汤方明
Original Assignee
江苏恒力化纤股份有限公司
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Publication date
Application filed by 江苏恒力化纤股份有限公司 filed Critical 江苏恒力化纤股份有限公司
Priority to US17/789,792 priority Critical patent/US20230040916A1/en
Priority to JP2022540692A priority patent/JP7310028B2/ja
Priority to EP20909279.0A priority patent/EP4086375A4/en
Publication of WO2021135085A1 publication Critical patent/WO2021135085A1/zh

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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
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyesters
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/02—Heat treatment
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D01D4/02—Spinnerettes
    • D01D4/025—Melt-blowing or solution-blowing dies
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/082—Melt spinning methods of mixed yarn
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

  • the invention belongs to the technical field of fibers, and relates to a regenerated polyester filament and a preparation method thereof.
  • PET Polyethylene Terephthalate
  • polyester Polyethylene Terephthalate
  • the global production of PET exceeded 40 million tons, second only to polyolefin, and is a synthetic fiber.
  • the leading material used in the food packaging field (accounting for more than 80%).
  • the social reserves of waste polyester products are also very huge, especially the waste polyester textiles with complex and high content of impurities are increasing at a rate of one million tons per year. The recovery rate is less than 3%, and the resulting waste of petrochemical resources and solid waste pollution are becoming increasingly serious.
  • waste polyester especially low-quality waste such as waste polyester textiles
  • the regeneration technology of polyester is improving day by day, and the proportion of recycled polyester fiber in recycled polyester products is relatively large.
  • the current recycled polyester fiber does not have a three-dimensional crimp shape, so it does not have some special properties, such as warmth retention, etc., nor can it be used to prepare various filling materials, covers and other cold protection products, etc., to a certain extent Limits the development of recycled polyester fibers.
  • the invention relates to a regenerated polyester filament and a preparation method thereof, and aims to solve the problem that the regenerated polyester fiber does not have a three-dimensional crimp shape in the prior art.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester (ie, recycled PET) according to the FDY process, circular blowing is used for cooling, and the arrangement of the spinneret holes on the spinneret is controlled to meet certain requirements. Conditions: After the FDY yarn is produced, the relaxed heat treatment is performed to obtain the recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of line AB is greater than 0.1mm;
  • the certain condition is: all the spinneret holes are distributed in concentric circles, the C-shaped spinneret holes are located on the outermost circle, and the straight line between the two points AB on the cross section of any C-shaped spinneret is the reference line, and the other The straight lines at the two points AB on the cross section of all C-shaped spinneret holes are at a certain angle with the reference line, and the angle is randomly distributed in the range of 0-360°.
  • the cooling rate at different positions is inconsistent.
  • the faster cooling part is not easy to be drawn and thinned in the subsequent process, and the stress is not concentrated, while the slower cooling part is in the subsequent process.
  • it is easy to be stretched and thinned, and the stress is concentrated. Therefore, the stress and thickness of the fiber are asymmetrical.
  • This kind of fiber with asymmetrical stress and thickness in the cross section will exhibit three-dimensional crimping performance during the heat treatment or stretching process.
  • the crimp is good, and the elastic recovery rate of the fiber is large.
  • the present invention uses C-shaped spinneret holes to prepare recycled polyester filaments to produce a three-dimensional crimped form.
  • the monofilament crimping direction of three-dimensional crimped fibers is the same. When it is applied to knitted fabrics, it will produce "striated unevenness”. The stress and thickness asymmetry of the C-shaped fiber cross section will affect the three-dimensional The crimp shape has a greater impact.
  • the present invention controls the arrangement of C-shaped spinneret holes to meet certain conditions so that the cross-sectional stress and thickness asymmetry of fibers extruded from different C-shaped spinneret holes are not completely the same.
  • the crimping of the fibers extruded from different C-shaped spinnerets is not exactly the same, and the crimping direction of the monofilament is not exactly the same, breaking a bundle of fibers to form a neat left and right spiral shape, thereby solving the problem of C-shaped regenerated polymer Knitted fabrics made of ester fibers have the problem of "striated unevenness".
  • the central angle of M is 180-330°.
  • the ratio of the number of C-shaped spinneret holes to circular spinneret holes is 70:30 to 80:20.
  • the intrinsic viscosity of the recycled polyester melt is 0.60 to 0.70 dL/g.
  • the parameters of FDY process are: spinning temperature 270 ⁇ 275°C, cooling temperature 20 ⁇ 25°C, cooling wind speed 1.80 ⁇ 2.30m/s, one roll speed 1800 ⁇ 2000m/min, the temperature of one roll is 85 ⁇ 95°C, the speed of two rolls is 3100 ⁇ 3300m/min, the temperature of two rolls is 150 ⁇ 160°C, and the winding speed is 3030 ⁇ 3210m/min.
  • the temperature of the relaxation heat treatment is 90-120°C and the time is 20-30 minutes.
  • the present invention also provides a recycled polyester filament prepared by a method for preparing recycled polyester filament as described in any one of the above, which is mainly composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester filaments. It is composed of recycled polyester monofilaments with a circular cross-section.
  • the cross-sectional stress of the same recycled polyester monofilament with a C-shaped cross-section is asymmetrical.
  • the positions of the upper stress asymmetry are not exactly the same; the recycled polyester filaments have a three-dimensional crimp shape, and the monofilament crimping directions are randomly distributed.
  • the regenerated polyester filament has a crimp shrinkage ratio of 28 to 33%, a crimp stability of 78 to 82%, a shrinkage elongation of 65 to 72%, and a crimp elastic recovery rate 75 to 80%.
  • the breaking strength of the recycled polyester filament is ⁇ 2.6 dtex, the elongation at break is 55.0 ⁇ 5.0%, and the total fineness is 100-150 dtex.
  • a method for preparing recycled polyester filaments of the present invention uses C-shaped spinneret holes to obtain recycled polyester filaments with a three-dimensional crimp shape;
  • the regenerated polyester filament prepared by the invention has excellent comprehensive properties.
  • the crimp shrinkage rate and crimp stability of the present invention are obtained by testing the tow using GB6506-2001 "Test Method for Crimp Performance of Synthetic Fiber Textured Yarn";
  • the shrinkage elongation (reflecting the elasticity and crimp degree of the deformed yarn, the fiber first bears a light load and then a heavy load, calculates the ratio of the length difference under the two loads to the crimp length) and the crimp elastic recovery rate test methods are as follows:
  • CE (l 2 -l 1 )/l 1 ;
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.6 dL/g according to the FDY process, circular blowing is used for cooling, and the row of spinneret holes on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of the line segment AB is 0.11mm;
  • the number is 24, taking the line at the two points AB on the cross section of any C-shaped spinneret as the reference line, and the line at the two points AB on the cross section of all other C-shaped spinning holes is in line with the reference line A certain angle, along the clockwise direction, the inferior angles are 20°, 75°, 15°, 22°, 3°, 170°, 40°, 90°, 1°, 45°, 30°, 10° , 10°, 60°, 2°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;
  • the parameters of FDY process are: spinning temperature 270°C, cooling temperature 20°C, cooling wind speed 1.8m/s, one roll speed 1800m/min, one roll temperature 85°C, two roll speed 3100m/min, two roll temperature 150°C, Winding speed 3030m/min;
  • the temperature of relaxation heat treatment is 90°C, and the time is 30min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped The direction is randomly distributed; the crimp shrinkage rate of recycled polyester filament is 28%, the crimp stability is 78%, the shrinkage elongation rate is 65%, the crimp elastic recovery rate is 75%, the breaking strength is 2.6dtex, and the breaking elongation is The rate is 60%, and the total fineness is 100 dtex.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.6 dL/g according to the FDY process, circular blowing is used for cooling, and the row of spinneret holes on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of the line segment AB is 0.11mm;
  • the number is 24, taking the line at the two points AB on the cross section of any C-shaped spinneret as the reference line, and the line at the two points AB on the cross section of all other C-shaped spinning holes is in line with the reference line
  • a certain angle, along the clockwise direction, the inferior angle is 30°, 75°, 65°, 20°, 3°, 170°, 40°, 90°, 1°, 45°, 30°, 10° , 10°, 60°, 2°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;
  • the parameters of FDY process are: spinning temperature 270°C, cooling temperature 20°C, cooling wind speed 2.2m/s, one roll speed 1807m/min, one roll temperature 85°C, two roll speed 3168m/min, two roll temperature 150°C, Winding speed 3086m/min;
  • the temperature of relaxation heat treatment is 90°C, and the time is 30min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped
  • the direction is randomly distributed;
  • the crimp shrinkage rate of recycled polyester filament is 28%, the crimp stability is 78%, the shrinkage elongation is 66%, the crimp elastic recovery rate is 75%, the breaking strength is 2.6dtex, and the breaking elongation is 2.6dtex.
  • the rate is 59.1%, and the total fineness is 104 dtex.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.69dL/g according to the FDY process, circular blowing is used for cooling, and the number of spinneret holes on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of the line segment AB is 0.11mm;
  • the number is 24, taking the line at the two points AB on the cross section of any C-shaped spinneret as the reference line, and the line at the two points AB on the cross section of all other C-shaped spinning holes is in line with the reference line A certain angle, along the clockwise direction, the inferior angles are 30°, 75°, 18°, 22°, 13°, 170°, 56°, 90°, 1°, 45°, 30°, 10° , 10°, 60°, 2°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;
  • FDY process spinning temperature 272°C, cooling temperature 24°C, cooling wind speed 2m/s, one roll speed 1814m/min, one roll temperature 89°C, two roll speed 3178m/min, two roll temperature 153°C, roll Winding speed 3139m/min;
  • the temperature of relaxation heat treatment is 93°C, and the time is 30min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped
  • the direction is randomly distributed;
  • the crimp shrinkage rate of recycled polyester filament is 29%, the crimp stability is 79%, the shrinkage elongation is 67%, the crimp elastic recovery rate is 75%, the breaking strength is 2.6dtex, and the breaking elongation is 2.6dtex.
  • the rate is 59%, and the total fineness is 117 dtex.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.6 dL/g according to the FDY process, circular blowing is used for cooling, and the row of spinneret holes on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of line AB is 0.13mm;
  • the number is 24, taking the line at the two points AB on the cross section of any C-shaped spinneret as the reference line, and the line at the two points AB on the cross section of all other C-shaped spinning holes is in line with the reference line
  • a certain angle, along the clockwise direction, the inferior angle is 30°, 75°, 15°, 22°, 3°, 170°, 12°, 90°, 1°, 45°, 30°, 10° , 10°, 60°, 2°, 100°, 80°, 100°, 41°, 80°, 65°, 2°, 50°;
  • the parameters of FDY process are: spinning temperature 273°C, cooling temperature 22°C, cooling wind speed 1.8m/s, one roll speed 1822m/min, one roll temperature 90°C, two roll speed 3203m/min, two roll temperature 154°C, Winding speed 3163m/min;
  • the temperature of relaxation heat treatment is 106°C, and the time is 29min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped
  • the directions are randomly distributed; the crimp shrinkage rate of recycled polyester filament is 29%, the crimp stability is 79%, the shrinkage elongation is 68%, the crimp elastic recovery rate is 76%, the breaking strength is 2.6dtex, and the breaking elongation is The rate is 58.5%, and the total fineness is 120 dtex.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.7dL/g according to the FDY process, circular blowing is used for cooling, and the row of spinnerets on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of line AB is 0.12mm;
  • the number is 24, taking the line at the two points AB on the cross section of any C-shaped spinneret as the reference line, and the line at the two points AB on the cross section of all other C-shaped spinning holes is in line with the reference line A certain angle, along the clockwise direction, the inferior angles are 30°, 75°, 15°, 20°, 3°, 170°, 40°, 90°, 1°, 45°, 30°, 10° , 10°, 60°, 2°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;
  • the parameters of the FDY process are: spinning temperature 274°C, cooling temperature 21°C, cooling wind speed 2.2m/s, one roll speed 1852m/min, one roll temperature 90°C, two roll speed 3227m/min, two roll temperature 154°C, Winding speed 3180m/min;
  • the temperature of relaxation heat treatment is 114°C, and the time is 28min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped The directions are randomly distributed; the crimp shrinkage rate of the recycled polyester filament is 31%, the crimp stability is 79%, the shrinkage elongation is 71%, the crimp elastic recovery rate is 76%, the breaking strength is 2.8dtex, and the breaking elongation is The rate is 57.8%, and the total fineness is 135 dtex.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.6 dL/g according to the FDY process, circular blowing is used for cooling, and the row of spinneret holes on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of the line segment AB is 0.11mm;
  • the number is 24, taking the line at the two points AB on the cross section of any C-shaped spinneret as the reference line, and the line at the two points AB on the cross section of all other C-shaped spinning holes is in line with the reference line A certain angle, along the clockwise direction, the inferior angles are 30°, 75°, 15°, 22°, 3°, 170°, 31°, 90°, 1°, 45°, 30°, 10° , 10°, 60°, 2°, 100°, 106°, 100°, 41°, 80°, 65°, 2°, 50°;
  • the parameters of FDY process are: spinning temperature 275°C, cooling temperature 22°C, cooling wind speed 1.9m/s, one roll speed 1911m/min, one roll temperature 92°C, two roll speed 3265m/min, two roll temperature 158°C, Winding speed 3185m/min;
  • the temperature of relaxation heat treatment is 115°C, and the time is 25min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped The direction is randomly distributed; the crimp shrinkage rate of the recycled polyester filament is 32%, the crimp stability is 82%, the shrinkage elongation is 71%, the crimp elastic recovery rate is 76%, the breaking strength is 2.8dtex, and the breaking elongation is The rate is 57.6%, and the total fineness is 132 dtex.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.63dL/g according to the FDY process, circular blowing is used for cooling, and the row of spinneret holes on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of the line segment AB is 0.11mm;
  • FDY process spinning temperature 275°C, cooling temperature 24°C, cooling wind speed 2.3m/s, one roll speed 1981m/min, one roll temperature 93°C, two roll speed 3284m/min, two roll temperature 159°C, Winding speed 3202m/min;
  • the temperature of relaxation heat treatment is 116°C, and the time is 22min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped The direction is randomly distributed; the crimp shrinkage rate of recycled polyester filament is 33%, the crimp stability is 82%, the shrinkage elongation is 71%, the crimp elastic recovery rate is 80%, the breaking strength is 2.9dtex, and the breaking elongation is The rate is 56.9%, and the total fineness is 146 dtex.
  • a method for preparing recycled polyester filaments In the process of preparing fibers from recycled polyester with an intrinsic viscosity of 0.7dL/g according to the FDY process, circular blowing is used for cooling, and the row of spinnerets on the spinneret is controlled. The fabric meets certain conditions, and the FDY yarn is made and subjected to relaxation heat treatment to obtain recycled polyester filament;
  • the spinneret holes are C-shaped spinneret holes and circular spinneret holes.
  • the cross-section of the C-shaped spinneret hole is enclosed by the outer arc line M, the inner arc line N and two line segments.
  • the two ends of M are A and B respectively.
  • the length of line AB is 0.14mm;
  • the parameters of FDY process are: spinning temperature 275°C, cooling temperature 25°C, cooling wind speed 2.3m/s, one roll speed 2000m/min, one roll temperature 95°C, two roll speed 3300m/min, two roll temperature 160°C, Winding speed 3210m/min;
  • the temperature of relaxation heat treatment is 120°C, and the time is 20min;
  • the final recycled polyester filament is composed of multiple recycled polyester monofilaments with a C-shaped cross section and multiple recycled polyester monofilaments with a circular cross section.
  • the same recycled polyester with a C-shaped cross section The stress on the cross section of the monofilament is asymmetric, and the positions of the asymmetric stress on the cross section of all recycled polyester monofilaments with a C-shaped cross section are not completely the same;
  • the recycled polyester filament has a three-dimensional crimped morphology, and the monofilament is crimped The direction is randomly distributed; the crimp shrinkage rate of recycled polyester filament is 33%, the crimp stability is 82%, the shrinkage elongation rate is 72%, the crimp elastic recovery rate is 80%, the breaking strength is 2.9dtex, and the breaking elongation is The rate is 50%, and the total fineness is 150 dtex.

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Abstract

一种再生聚酯长丝及其制备方法，在按FDY工艺由再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，外弧线M的两端点分别为A和B；所有的喷丝孔呈同心圆分布，C形喷丝孔位于最外圈的圆上，以不同的角度旋转，随机分布。该再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；该方法采用简单的方法制得了具有三维卷曲形态的再生聚酯长丝，并解决了由三维卷曲纤维制得的针织物容易产生"条阴状不匀"的问题。

Description

一种再生聚酯长丝及其制备方法 技术领域
本发明属于纤维技术领域，涉及一种再生聚酯长丝及其制备方法。
背景技术
聚对苯二甲酸乙二醇酯(Polyethylene Terephthalate，PET，简称聚酯)是一种应用广泛的合成高分子材料，2015年全球PET产量超过4千万吨，仅次于聚烯烃，是合成纤维和食品包装领域所使用的主导材料(所占比重超过80％)。然而作为一种不易降解的石油基合成高分子材料，聚酯废弃制品的社会储量也非常巨大，特别是杂质种类复杂、含量高的废旧聚酯纺织品每年正以百万吨的速度增长，但目前的回收率还不足3％，由此引发的石化资源浪费和固体废弃物污染问题也日益严峻。因此废弃聚酯(特别是废旧聚酯纺织品等低品质废料)的高效高品质再生技术对于行业的可持续发展具有重大意义。聚酯的再生技术日臻完善，再生聚酯的产品中再生聚酯纤维所占比重较大。
然而，目前的再生聚酯纤维不具有三维卷曲形态，因而不具备一些特殊性能，如保暖性能等等，也不能用于制备各种填充材料、盖被等防寒用品等等，这在一定程度上限制了再生聚酯纤维的发展。
发明内容
本发明一种再生聚酯长丝及其制备方法，目的是解决现有技术中再生聚酯纤维不具有三维卷曲形态的问题。
为达到上述目的，本发明采用的方案如下：
一种再生聚酯长丝的制备方法，在按FDY工艺由再生聚酯(即再生PET)制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度大于0.1mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔位于最外圈的圆上，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，夹角在0～360°的范围内随机分布。
熔体从C形喷丝孔挤出后，不同位置的冷却速度是不一致的，冷却较快的部分在后续过程中不容易被牵伸变细，应力不集中，而冷却较慢的部分在后续过程中容易被牵伸变细，应力集中，因此纤维的横截面上应力和粗细均不对称，这种横截面上应力和粗细不对称的纤维在热处理或拉伸过程中会呈现三维卷曲性能，且卷曲好，纤维弹性回复率大，本发明利用C形喷丝孔制备再生聚酯长丝，使其产生了三维 卷曲形态。
此外，一般地三维卷曲纤维的单丝卷曲方向是相同的，当其应用于针织物时会产生“条阴状不匀”，由于C形纤维横截面上应力和粗细不对称会对纤维的三维卷曲形态产生较大的影响，本发明控制C形喷丝孔的排布满足一定的条件使得从不同C形喷丝孔挤出的纤维的横截面上应力和粗细不对称的情况不完全相同，进而使得从不同C形喷丝孔挤出的纤维的卷曲情况不完全相同，单丝卷曲方向不完全相同，打破了一束纤维形成整齐的左、右螺旋形态，进而解决了由C形再生聚酯纤维制得的针织物存在的“条阴状不匀”的问题。
作为优选的方案：
如上所述的一种再生聚酯长丝的制备方法，M的圆心角为180～330°。
如上所述的一种再生聚酯长丝的制备方法，C形喷丝孔和圆形喷丝孔的数量比为70:30～80:20。
如上所述的一种再生聚酯长丝的制备方法，再生聚酯熔体的特性粘度为0.60～0.70dL/g。
如上所述的一种再生聚酯长丝的制备方法，FDY工艺的参数为：纺丝温度270～275℃，冷却温度20～25℃，冷却风速1.80～2.30m/s，一辊速度1800～2000m/min，一辊温度85～95℃，二辊速度3100～3300m/min，二辊温度150～160℃，卷绕速度3030～3210m/min。
如上所述的一种再生聚酯长丝的制备方法，松弛热处理的温度为90～120℃，时间为20～30min。
本发明还提供了采用如上任一项所述的一种再生聚酯长丝的制备方法制得的再生聚酯长丝，主要由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布。
作为优选的方案：
如上所述的再生聚酯长丝，再生聚酯长丝的卷曲收缩率为28～33％，卷曲稳定度为78～82％，紧缩伸长率为65～72％，卷缩弹性回复率为75～80％。
如上所述的再生聚酯长丝，再生聚酯长丝的断裂强度≥2.6dtex，断裂伸长率为55.0±5.0％，总纤度为100～150dtex。
有益效果：
(1)本发明的一种再生聚酯长丝的制备方法，通过采用C形喷丝孔，制得了具有三维卷曲形态的再生聚酯长丝；
(2)本发明的一种再生聚酯长丝的制备方法，通过控制喷丝板上喷丝孔的排布满足一定的条件，解决了由三维卷曲纤维制得的针织物容易产生“条阴状不匀”的问题；
(3)本发明制得的再生聚酯长丝综合性能优良。
具体实施方式
下面结合具体实施方式，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。
本发明的卷曲收缩率和卷曲稳定度是采用GB6506-2001《合成纤维变形丝卷缩性能试验方法》对丝束进行测试得到的；
紧缩伸长率(反映变形丝的弹性和卷曲程度，纤维先承受轻负荷，再承受重负荷，计算两种负荷下的长度差值与卷曲长度的比值)和卷缩弹性回复率测试方法如下：
首先剪取长度约50cm的纤维试样两根，放入100℃热水中处理30min，取出后进行自然干燥，再截取约30cm长的试样，一端固定，一端加载0.0018cN/dtex的负荷，持续30s，在20cm处作标记，即为试样的初始长度l 1；然后改为加载0.09cN/dtex的负荷，持续30s，测量标记点的位置，即为试样加重负荷时的长度l 2；最后去掉重负荷，试样无负荷回缩2min后再加0.0018cN/dtex的负荷，持续30s，测量标记点在标尺上的位置，即为回复长度l 3；紧缩伸长率(CE)和卷缩弹性回复率(SR)按下式计算：
CE＝(l 2-l 1)/l 1；
SR＝(l 2-l 3)/(l 2-l 1)。
实施例1
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.6dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.11mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为70:30，C形喷丝孔位于最外圈的圆上，呈等距分布，数量为24个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为20°、75°、15°、22°、3°、170°、40°、90°、1°、45°、30°、10°、10°、60°、2°、100°、106°、100°、41°、80°、65°、2°、50°；
FDY工艺的参数为：纺丝温度270℃，冷却温度20℃，冷却风速1.8m/s，一辊速度1800m/min，一辊温度85℃，二辊速度3100m/min，二辊温度150℃，卷绕速度3030m/min；
松弛热处理的温度为90℃，时间为30min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单 丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为28％，卷曲稳定度为78％，紧缩伸长率为65％，卷缩弹性回复率为75％，断裂强度为2.6dtex，断裂伸长率为60％，总纤度为100dtex。
实施例2
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.6dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.11mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为80:20，C形喷丝孔位于最外圈的圆上，呈等距分布，数量为24个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为30°、75°、65°、20°、3°、170°、40°、90°、1°、45°、30°、10°、10°、60°、2°、100°、106°、100°、41°、80°、65°、2°、50°；
FDY工艺的参数为：纺丝温度270℃，冷却温度20℃，冷却风速2.2m/s，一辊速度1807m/min，一辊温度85℃，二辊速度3168m/min，二辊温度150℃，卷绕速度3086m/min；
松弛热处理的温度为90℃，时间为30min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为28％，卷曲稳定度为78％，紧缩伸长率为66％，卷缩弹性回复率为75％，断裂强度为2.6dtex，断裂伸长率为59.1％，总纤度为104dtex。
实施例3
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.69dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.11mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为80:20，C形喷丝孔 位于最外圈的圆上，呈等距分布，数量为24个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为30°、75°、18°、22°、13°、170°、56°、90°、1°、45°、30°、10°、10°、60°、2°、100°、106°、100°、41°、80°、65°、2°、50°；
FDY工艺的参数为：纺丝温度272℃，冷却温度24℃，冷却风速2m/s，一辊速度1814m/min，一辊温度89℃，二辊速度3178m/min，二辊温度153℃，卷绕速度3139m/min；
松弛热处理的温度为93℃，时间为30min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为29％，卷曲稳定度为79％，紧缩伸长率为67％，卷缩弹性回复率为75％，断裂强度为2.6dtex，断裂伸长率为59％，总纤度为117dtex。
实施例4
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.6dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.13mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为80:20，C形喷丝孔位于最外圈的圆上，呈等距分布，数量为24个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为30°、75°、15°、22°、3°、170°、12°、90°、1°、45°、30°、10°、10°、60°、2°、100°、80°、100°、41°、80°、65°、2°、50°；
FDY工艺的参数为：纺丝温度273℃，冷却温度22℃，冷却风速1.8m/s，一辊速度1822m/min，一辊温度90℃，二辊速度3203m/min，二辊温度154℃，卷绕速度3163m/min；
松弛热处理的温度为106℃，时间为29min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为29％，卷曲稳定度为79％，紧缩伸长率为68％，卷缩弹性回复率为 76％，断裂强度为2.6dtex，断裂伸长率为58.5％，总纤度为120dtex。
实施例5
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.7dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.12mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为80:20，C形喷丝孔位于最外圈的圆上，呈等距分布，数量为24个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为30°、75°、15°、20°、3°、170°、40°、90°、1°、45°、30°、10°、10°、60°、2°、100°、106°、100°、41°、80°、65°、2°、50°；
FDY工艺的参数为：纺丝温度274℃，冷却温度21℃，冷却风速2.2m/s，一辊速度1852m/min，一辊温度90℃，二辊速度3227m/min，二辊温度154℃，卷绕速度3180m/min；
松弛热处理的温度为114℃，时间为28min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为31％，卷曲稳定度为79％，紧缩伸长率为71％，卷缩弹性回复率为76％，断裂强度为2.8dtex，断裂伸长率为57.8％，总纤度为135dtex。
实施例6
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.6dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.11mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为70:30，C形喷丝孔位于最外圈的圆上，呈等距分布，数量为24个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为30°、75°、15°、22°、3°、170°、31°、90°、1°、45°、30°、10°、10°、60°、2°、100°、 106°、100°、41°、80°、65°、2°、50°；
FDY工艺的参数为：纺丝温度275℃，冷却温度22℃，冷却风速1.9m/s，一辊速度1911m/min，一辊温度92℃，二辊速度3265m/min，二辊温度158℃，卷绕速度3185m/min；
松弛热处理的温度为115℃，时间为25min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为32％，卷曲稳定度为82％，紧缩伸长率为71％，卷缩弹性回复率为76％，断裂强度为2.8dtex，断裂伸长率为57.6％，总纤度为132dtex。
实施例7
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.63dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.11mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为70:30，C形喷丝孔位于最外圈的圆上，呈等距分布，数量为12个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为3°、170°、40°、90°、1°、45°、30°、10°、10°、60°、2°、；
FDY工艺的参数为：纺丝温度275℃，冷却温度24℃，冷却风速2.3m/s，一辊速度1981m/min，一辊温度93℃，二辊速度3284m/min，二辊温度159℃，卷绕速度3202m/min；
松弛热处理的温度为116℃，时间为22min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为33％，卷曲稳定度为82％，紧缩伸长率为71％，卷缩弹性回复率为80％，断裂强度为2.9dtex，断裂伸长率为56.9％，总纤度为146dtex。
实施例8
一种再生聚酯长丝的制备方法，在按FDY工艺由特性粘度为0.7dL/g的再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得 再生聚酯长丝；
喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度为0.14mm；
一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔和圆形喷丝孔的数量比为70:30，C形喷丝孔位于最外圈的圆上，呈等距分布，数量为12个，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，沿顺时针方向，劣角夹角依次为15°、22°、3°、45°、30°、10°、10°、60°、2°、98°、106°；
FDY工艺的参数为：纺丝温度275℃，冷却温度25℃，冷却风速2.3m/s，一辊速度2000m/min，一辊温度95℃，二辊速度3300m/min，二辊温度160℃，卷绕速度3210m/min；
松弛热处理的温度为120℃，时间为20min；
最终制得的再生聚酯长丝由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布；再生聚酯长丝的卷曲收缩率为33％，卷曲稳定度为82％，紧缩伸长率为72％，卷缩弹性回复率为80％，断裂强度为2.9dtex，断裂伸长率为50％，总纤度为150dtex。

Claims (9)

  1. 一种再生聚酯长丝的制备方法，其特征是：在按FDY工艺由再生聚酯制备纤维的过程中，采用环吹风冷却，并控制喷丝板上的喷丝孔的排布满足一定条件，制得FDY丝后进行松弛热处理即得再生聚酯长丝；
    喷丝孔为C形喷丝孔和圆形喷丝孔，C形喷丝孔的横截面由外弧线M、内弧线N和两线段围成，M的两端点分别为A和B，线段AB的长度大于0.1mm；
    一定条件为：所有的喷丝孔呈同心圆分布，C形喷丝孔位于最外圈的圆上，以任一C形喷丝孔的横截面上AB两点所在的直线为基准线，其他所有C形喷丝孔的横截面上AB两点所在的直线都与基准线呈一定夹角，夹角在0～360°的范围内随机分布。
  2. 根据权利要求1所述的一种再生聚酯长丝的制备方法，其特征在于，M的圆心角为180～330°。
  3. 根据权利要求2所述的一种再生聚酯长丝的制备方法，其特征在于，C形喷丝孔和圆形喷丝孔的数量比为70:30～80:20。
  4. 根据权利要求3所述的一种再生聚酯长丝的制备方法，其特征在于，再生聚酯熔体的特性粘度为0.60～0.70dL/g。
  5. 根据权利要求4所述的一种再生聚酯长丝的制备方法，其特征在于，FDY工艺的参数为：纺丝温度270～275℃，冷却温度20～25℃，冷却风速1.80～2.30m/s，一辊速度1800～2000m/min，一辊温度85～95℃，二辊速度3100～3300m/min，二辊温度150～160℃，卷绕速度3030～3210m/min。
  6. 根据权利要求5所述的一种再生聚酯长丝的制备方法，其特征在于，松弛热处理的温度为90～120℃，时间为20～30min。
  7. 采用如权利要求1～6任一项所述的一种再生聚酯长丝的制备方法制得的再生聚酯长丝，其特征是：主要由多根横截面呈C形的再生聚酯单丝和多根横截面呈圆形的再生聚酯单丝组成，同一根横截面呈C形的再生聚酯单丝的横截面上应力不对称，所有的横截面呈C形的再生聚酯单丝的横截面上应力不对称的位置不完全相同；再生聚酯长丝具有三维卷曲形态，且单丝卷曲方向随机分布。
  8. 根据权利要求7所述的再生聚酯长丝，其特征在于，再生聚酯长丝的卷曲收缩率为28～33％，卷曲稳定度为78～82％，紧缩伸长率为65～72％，卷缩弹性回复率为75～80％。
  9. 根据权利要求7所述的再生聚酯长丝，其特征在于，再生聚酯长丝的断裂强度≥2.6dtex，断裂伸长率为55.0±5.0％，总纤度为100～150dtex。
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