CN111118632A - Rabbit hair-imitated PBT fiber and preparation method thereof - Google Patents
Rabbit hair-imitated PBT fiber and preparation method thereof Download PDFInfo
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- CN111118632A CN111118632A CN201911386285.6A CN201911386285A CN111118632A CN 111118632 A CN111118632 A CN 111118632A CN 201911386285 A CN201911386285 A CN 201911386285A CN 111118632 A CN111118632 A CN 111118632A
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- 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
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- 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
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
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- 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
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
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- 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
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/08—Addition of substances to the spinning solution or to the melt for forming hollow filaments
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- 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
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
- D02G1/20—Combinations of two or more of the above-mentioned operations or devices; After-treatments for fixing crimp or curl
- D02G1/205—After-treatments for fixing crimp or curl
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- 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
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- Mechanical Engineering (AREA)
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- Manufacturing & Machinery (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Artificial Filaments (AREA)
- Multicomponent Fibers (AREA)
Abstract
The invention relates to a rabbit hair-imitated PBT fiber and a preparation method thereof, wherein the preparation method comprises the following steps: extruding PBT melt from trilobal spinneret orifices and hollow spinneret orifices which are arranged on a composite spinneret plate and have different included angles between three leaves and different lengths of the three leaves, cooling by adopting circular blowing, preparing FDY (fully drawn yarn) filaments according to an FDY process, and performing relaxation heat treatment to obtain the rabbit hair-like PBT fibers; the prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections, the curling shrinkage rate of the rabbit hair-imitated PBT fiber is 28-32%, the curling stability is 80-85%, the tightening elongation is 77-82%, and the elastic recovery rate of curling is 79-84%. The method is simple and easy to implement, and the prepared rabbit hair-imitated PBT fiber has good crimping performance, good warmth retention property, stiffness and hand feeling and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of polyester fibers, and relates to a rabbit hair-like PBT fiber and a preparation method thereof.
Background
The rabbit hair contains various amino acids, has small density, light specific gravity, good heat preservation effect, strong moisture absorption performance, smoothness and good glossiness, is similar to the composition structure of human skin, and has good skin-friendly feeling, so the rabbit hair is widely applied in the field of clothing, but the collection cost of the rabbit hair is higher, the cost of raw materials is higher, in addition, the international market and the domestic market call for protecting animals, forbidding killing animals, making clothes, accessories, shoes and the like by using animal skin hair, and therefore, a product which has lower cost and better performance and can replace the rabbit hair is necessary.
The rabbit hair-like fiber and the rabbit hair-like fabric thereof are produced, but the rabbit hair-like fabric needs to be further improved in the aspects of wearing comfort, heat retention and other physical properties.
Therefore, the research on the rabbit hair-like fiber with better warmth retention property, stiffness and touch and the preparation method thereof have very important significance.
Disclosure of Invention
The invention provides a rabbit hair-like PBT fiber and a preparation method thereof, and aims to solve the problems of poor warmth retention property, stiffness and touch of the rabbit hair-like PBT fiber in the prior art.
In order to achieve the purpose, the invention adopts the following scheme:
a preparation method of rabbit hair-like PBT fiber comprises extruding PBT melt from spinneret orifices on a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to an FDY process, and performing relaxation heat treatment to obtain the rabbit hair-like PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle (the trilobal spinneret orifices are positioned on the outermost circle to ensure that the prepared fibers have better self-curling shape);
the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0: 1.4-2.5: 1.6-3.7, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the ratio of the length of the shortest leaf to the width is 2.5-3.5: 1; the three leaves of different trilobal spinneret orifices have the same shape and size;
the central line of the blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points to deviate from the center of the concentric circle.
The principle of the invention is as follows:
the invention makes one bundle of filament have PBT monofilament with trilobal cross section and PBT monofilament with hollow cross section by arranging the spinneret orifices of two shapes on the composite spinneret plate at the same time, the PBT monofilament with hollow cross section can endow the fiber with better heat preservation performance, the rigidity of the trilobal with the same area is larger than that of the round fiber, thereby improving the bending modulus under the condition of unchanging the fineness, ensuring the softness, being not easy to fall down, endowing the fiber with better stiffness, the PBT monofilament with the trilobal cross section can self-curl when being heated, the space between the adjacent fibers is expanded, greatly increasing the fluffiness, and endowing the fiber with better hand feeling.
The PBT monofilament with the trilobal cross section can be self-curled when heated because: the PBT melt is extruded from trilobal spinneret orifices with unequal included angles among three leaves and unequal lengths of the three leaves on the composite spinneret plate, the center line of the leaf between the minimum included angle and the maximum included angle passes through the circle center of a concentric circle and deviates from the circle center in a pointing manner, and meanwhile, circular blowing is adopted for cooling, three leaf cooling conditions are seriously asymmetric and unbalanced, so that after fibers are automatically sprayed out, the cooling speeds of the melt at different positions on the cross section are inconsistent, and the main appearance is as follows: during spinning, the cooling air speed is high and is between 1.80 and 2.30m/s, the part close to the air blowing port is cooled earlier and faster, and the part far away from the air blowing port is cooled slower. When one of the trefoils in the trefoil spinneret hole faces the cooling wind, the melt of the blade is cooled quickly, and the other parts in the trefoil are cooled slowly, the other parts in the trefoil are drawn and thinned more easily under the tension of drawing, and the stress is concentrated more, so that a trefoil stress asymmetric structure can be generated on the cross section of the fiber with trefoil, and the fiber with asymmetric stress and thickness on the cross section can present three-dimensional curling performance and curl well in the heat treatment or drawing process.
As a preferred technical scheme:
according to the preparation method of the rabbit hair-imitated PBT fiber, the intrinsic viscosity of the PBT melt is 1.12-1.25 dL/g.
According to the preparation method of the rabbit hair-imitated PBT fiber, the parameters of the FDY process are as follows: the spinning temperature is 270-280 ℃, the cooling temperature is 20-25 ℃, the cooling air speed is 1.80-2.30 m/s, the one-roller speed is 1800-2000 m/min, the one-roller temperature is 60-70 ℃, the two-roller speed is 3300-3500 m/min, the two-roller temperature is 125-130 ℃, and the winding speed is 3230-3410 m/min.
According to the preparation method of the rabbit hair-imitated PBT fiber, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 70: 30-80: 20.
According to the preparation method of the rabbit hair-imitated PBT fiber, the temperature of relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
The invention also provides the rabbit hair-imitated PBT fiber prepared by the preparation method of the rabbit hair-imitated PBT fiber, which has a three-dimensional crimp shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections.
As a preferred technical scheme:
the rabbit hair-imitated PBT fiber has the crimping shrinkage rate of 28-32%, the crimping stability of 80-85%, the shrinkage elongation of 77-82% and the crimping elastic recovery of 79-84%.
The rabbit hair-like PBT fiber has the breaking strength of more than or equal to 2.6cN/dtex, the elongation at break of 45.0 +/-4.0 percent and the filament number of 0.6-0.8 dtex.
Has the advantages that:
(1) the preparation method of the rabbit hair-imitated PBT fiber is simple and feasible and has low cost;
(2) according to the preparation method of the rabbit hair-imitated PBT fiber, disclosed by the invention, as the composite spinneret plate with two different spinneret hole shapes is adopted, one bundle of fibers is provided with the PBT monofilament with the trefoil-shaped cross section and the PBT monofilament with the hollow cross section;
(3) the rabbit hair-imitated PBT fiber disclosed by the invention is good in crimpability, good in warmth retention property, stiff and smooth, good in handfeel and wide in application prospect.
Drawings
FIG. 1 is a schematic view of the trilobal spinneret orifice of the present invention;
fig. 2 is a schematic diagram of the distribution of trilobal orifices of the present invention on a composite spinneret.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The crimp shrinkage and crimp stability of the invention are obtained by testing the tow in GB6506-2001 synthetic fiber textured yarn crimp performance test method;
the method for testing the shrinkage elongation (reflecting the elasticity and the crimp degree of the deformed filament, the fiber is firstly loaded under light load and then loaded under heavy load, and the ratio of the length difference value under the two loads to the crimp length) and the crimp elastic recovery rate is as follows:
firstly, cutting two fiber samples with the length of about 50cm, putting the two fiber samples into hot water with the temperature of 100 ℃ for treatment for 30min, taking the two fiber samples out, naturally drying the two fiber samples, cutting the sample with the length of about 30cm, fixing one end of the sample, and loading a negative pole with the length of 0.0018cN/dtex on one end of the sampleThe load lasts for 30s and is marked at a position of 20cm, namely the initial length l of the sample1(ii) a Then, the load of 0.09cN/dtex is loaded for 30s, and the position of the mark point is measured, namely the length l when the sample is loaded with heavy load2(ii) a Finally, removing the heavy load, retracting the sample for 2min without load, then adding the load of 0.0018cN/dtex, continuing for 30s, and measuring the position of the mark point on the scale, namely the recovery length l3(ii) a The percent elongation at Compression (CE) and the elastic recovery from crimp (SR) are calculated as follows:
CE＝(l2-l1)/l1；
SR＝(l2-l3)/(l2-l1)。
the trilobal spinneret orifices and the distribution of the trilobal spinneret orifices on the composite spinneret plate are shown in the attached figures 1-2, the trilobal spinneret orifices and the hollow spinneret orifices are simultaneously arranged on the composite spinneret plate, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0: 1.4-2.5: 1.6-3.7, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the ratio of the length of the shortest leaf to the width is 2.5-3.5: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of the blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points to deviate from the center of the concentric circle. The drawings are only schematic and should not be construed as limiting the invention.
Example 1
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.12dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 70:30, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:1.4:1.6, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the length ratio of the shortest leaf to the width is 2.5: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 270 ℃, the cooling temperature is 20 ℃, the cooling air speed is 1.8m/s, the one-roller speed is 1800m/min, the one-roller temperature is 60 ℃, the two-roller speed is 3300m/min, the two-roller temperature is 125 ℃, and the winding speed is 3230 m/min;
the temperature of the relaxation heat treatment is 90 deg.C, and the time is 30 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 28%, a crimp stability of 80%, a shrinkage elongation of 77%, a crimp elastic recovery of 79%, a breaking strength of 2.6cN/dtex, an elongation at break of 49%, and a single filament fineness of 0.6 dtex.
Example 2
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.14dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 70:30, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:1.4:1.9, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the ratio of the length of the shortest leaf to the width is 2.9: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 273 ℃, the cooling temperature is 20 ℃, the cooling wind speed is 2m/s, the first roller speed is 1866m/min, the first roller temperature is 60 ℃, the two roller speed is 3348m/min, the two roller temperature is 125 ℃, and the winding speed is 3250 m/min;
the temperature of the relaxation heat treatment is 98 deg.C, and the time is 29 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 28%, a crimp stability of 80%, a shrinkage elongation of 78%, a crimp elastic recovery of 79%, a breaking strength of 2.6cN/dtex, an elongation at break of 47.5%, and a single-filament fineness of 0.6 dtex.
Example 3
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.15dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 70:30, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:1.8:1.6, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the ratio of the length of the shortest leaf to the width is 2.8: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 275 ℃, the cooling temperature is 23 ℃, the cooling wind speed is 2.1m/s, the one-roller speed is 1867m/min, the one-roller temperature is 62 ℃, the two-roller speed is 3370m/min, the two-roller temperature is 125 ℃, and the winding speed is 3250 m/min;
the temperature of the relaxation heat treatment is 100 deg.C, and the time is 25 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 29%, a crimp stability of 80%, a shrinkage elongation of 78%, a crimp elastic recovery of 79%, a breaking strength of 2.7cN/dtex, an elongation at break of 47.2%, and a single-filament fineness of 0.8 dtex.
Example 4
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.22dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 80:20, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:2.5:1.6, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the length ratio of the shortest leaf to the width is 2.8: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 276 ℃, the cooling temperature is 24 ℃, the cooling air speed is 2.1m/s, the one-roller speed is 1870m/min, the one-roller temperature is 62 ℃, the two-roller speed is 3394m/min, the two-roller temperature is 127 ℃, and the winding speed is 3305 m/min;
the temperature of the relaxation heat treatment was 102 ℃ and the time was 23 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 30%, a crimp stability of 83%, a shrinkage elongation of 80%, a crimp elastic recovery of 82%, a breaking strength of 2.8cN/dtex, an elongation at break of 45.4%, and a single-filament fineness of 0.7 dtex.
Example 5
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.25dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 80:20, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:2.5:3.7, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the length ratio of the shortest leaf to the width is 2.7: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 277 ℃, the cooling temperature is 24 ℃, the cooling air speed is 2.1m/s, the first roller speed is 1922m/min, the first roller temperature is 63 ℃, the second roller speed is 3407m/min, the second roller temperature is 128 ℃, and the winding speed is 3356 m/min;
the temperature of the relaxation heat treatment is 103 deg.C, and the time is 22 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 30%, a crimp stability of 83%, a shrinkage elongation of 81%, a crimp elastic recovery of 84%, a breaking strength of 2.8cN/dtex, an elongation at break of 43.7%, and a single-filament fineness of 0.7 dtex.
Example 6
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.14dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 75:25, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:2.5:2.7, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the length ratio of the shortest leaf to the width is 2.9: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 277 ℃, the cooling temperature is 24 ℃, the cooling air speed is 2.1m/s, the first roller speed is 1937m/min, the first roller temperature is 65 ℃, the second roller speed is 3471m/min, the second roller temperature is 128 ℃, and the winding speed is 3366 m/min;
the temperature of the relaxation heat treatment was 106 ℃ and the time was 21 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 32%, a crimp stability of 85%, a shrinkage elongation of 81%, a crimp elastic recovery of 84%, a breaking strength of 2.8cN/dtex, an elongation at break of 42.1%, and a single-filament fineness of 0.6 dtex.
Example 7
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.14dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 70:30, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:1.8:2.3, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the length ratio of the shortest leaf to the width is 3.0: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 279 ℃, the cooling temperature is 24 ℃, the cooling air speed is 2.2m/s, the one-roller speed is 1959m/min, the one-roller temperature is 69 ℃, the two-roller speed is 3483m/min, the two-roller temperature is 129 ℃, and the winding speed is 3379 m/min;
the temperature of the relaxation heat treatment was 106 ℃ for 20 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 32%, a crimp stability of 85%, a shrinkage elongation of 82%, a crimp elastic recovery of 84%, a breaking strength of 2.8cN/dtex, an elongation at break of 41%, and a single filament fineness of 0.8 dtex.
Example 8
A preparation method of rabbit hair-imitated PBT fiber comprises extruding PBT melt with intrinsic viscosity of 1.25dL/g from spinneret orifices of a composite spinneret plate, cooling by circular blowing, preparing FDY filaments according to FDY process, and performing relaxation heat treatment to obtain rabbit hair-imitated PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 80:20, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the circle of the outermost circle; the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0:2.5:3.7, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the length ratio of the shortest leaf to the width is 3.5: 1; the three leaves of different trilobal spinneret orifices have the same shape and size; the central line of each blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points away from the center of the concentric circle;
the parameters of the FDY process are as follows: the spinning temperature is 280 ℃, the cooling temperature is 25 ℃, the cooling wind speed is 2.3m/s, the one-roller speed is 2000m/min, the one-roller temperature is 70 ℃, the two-roller speed is 3500m/min, the two-roller temperature is 130 ℃, and the winding speed is 3410 m/min;
the temperature of the relaxation heat treatment is 120 deg.C, and the time is 20 min.
The finally prepared rabbit hair-imitated PBT fiber has a three-dimensional curling shape and consists of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections; the rabbit hair-like PBT fiber has a crimp shrinkage of 32%, a crimp stability of 85%, a shrinkage elongation of 82%, a crimp elastic recovery of 84%, a breaking strength of 2.9cN/dtex, an elongation at break of 41%, and a single filament fineness of 0.8 dtex.
Claims (8)
1. A preparation method of rabbit hair-imitated PBT fiber is characterized by comprising the following steps: extruding a PBT melt from spinneret orifices on a composite spinneret plate, cooling by adopting circular blowing, preparing FDY filaments according to an FDY process, and performing relaxation heat treatment to obtain the rabbit hair-like PBT fiber;
the composite spinneret plate is simultaneously provided with trilobal spinneret orifices and hollow spinneret orifices, all the spinneret orifices are distributed in concentric circles, and the trilobal spinneret orifices are positioned on the outermost circle;
the included angle ratio of the center lines of the three leaves of the same trilobal spinneret orifice is 1.0: 1.4-2.5: 1.6-3.7, the widths of the three leaves are equal, the length ratio of the two leaves forming the largest included angle to the other leaf is 1:1:1.5, and the ratio of the length of the shortest leaf to the width is 2.5-3.5: 1; the three leaves of different trilobal spinneret orifices have the same shape and size;
the central line of the blade between the minimum included angle and the maximum included angle of each trilobal spinneret orifice passes through the center of the concentric circle and points to deviate from the center of the concentric circle.
2. The preparation method of the rabbit hair-imitated PBT fiber according to claim 1, wherein the intrinsic viscosity of the PBT melt is 1.12-1.25 dL/g.
3. The preparation method of the rabbit hair-imitated PBT fiber according to claim 2, wherein the parameters of the FDY process are as follows: the spinning temperature is 270-280 ℃, the cooling temperature is 20-25 ℃, the cooling air speed is 1.80-2.30 m/s, the one-roller speed is 1800-2000 m/min, the one-roller temperature is 60-70 ℃, the two-roller speed is 3300-3500 m/min, the two-roller temperature is 125-130 ℃, and the winding speed is 3230-3410 m/min.
4. The preparation method of the rabbit hair-like PBT fiber according to claim 1, wherein the number ratio of the trilobal spinneret orifices to the hollow spinneret orifices is 70:30 to 80: 20.
5. The preparation method of the rabbit hair-like PBT fiber according to claim 1, wherein the temperature of the relaxation heat treatment is 90-120 ℃ and the time is 20-30 min.
6. The rabbit hair-like PBT fiber prepared by the preparation method of the rabbit hair-like PBT fiber according to any one of claims 1 to 5, which is characterized in that: the three-dimensional crimping structure is composed of a plurality of PBT monofilaments with trilobal cross sections and a plurality of PBT monofilaments with hollow cross sections.
7. The rabbit hair-like PBT fiber according to claim 6, wherein the rabbit hair-like PBT fiber has a crimp shrinkage of 28 to 32%, a crimp stability of 80 to 85%, a shrinkage elongation of 77 to 82%, and a crimp elastic recovery of 79 to 84%.
8. The rabbit hair-like PBT fiber according to claim 6, wherein the rabbit hair-like PBT fiber has a breaking strength of not less than 2.6cN/dtex, an elongation at break of 45.0 ± 4.0%, and a single fiber fineness of 0.6-0.8 dtex.
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