CN110983527A - Nylon 6 composite fiber and preparation method thereof - Google Patents
Nylon 6 composite fiber and preparation method thereof Download PDFInfo
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- CN110983527A CN110983527A CN201911386287.5A CN201911386287A CN110983527A CN 110983527 A CN110983527 A CN 110983527A CN 201911386287 A CN201911386287 A CN 201911386287A CN 110983527 A CN110983527 A CN 110983527A
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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
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
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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
- 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
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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
- D01D5/08—Melt spinning methods
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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
- D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
- D01D5/23—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool by asymmetrical cooling of filaments, threads, or the like, leaving the spinnerettes
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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
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/32—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic
- D02G3/328—Elastic yarns or threads ; Production of plied or cored yarns, one of which is elastic containing elastane
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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
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/38—Threads in which fibres, filaments, or yarns are wound with other yarns or filaments, e.g. wrap yarns, i.e. strands of filaments or staple fibres are wrapped by a helically wound binder yarn
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- 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
- D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
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- 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
- D10B2401/00—Physical properties
- D10B2401/06—Load-responsive characteristics
- D10B2401/061—Load-responsive characteristics elastic
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Abstract
The invention relates to a nylon 6 composite fiber and a preparation method thereof, wherein the preparation method comprises the following steps: the PA6 is respectively spun according to the POY process and the FDY process, then is plied and doubled, and is subjected to network compounding, winding forming and relaxation heat treatment to prepare the nylon 6 composite fiber; spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape; spinneret orifices on a spinneret plate corresponding to the FDY process are in a trilobal shape with three leaves of unequal length and unequal width, and the FDY process adopts circular blowing for cooling; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center; the prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections. The preparation method is simple and feasible, and the prepared nylon 6 composite fiber has good fluffiness, rebound resilience, water absorption and air permeability.
Description
Technical Field
The invention belongs to the technical field of composite fibers, and relates to a nylon 6 composite fiber and a preparation method thereof.
Background
Polyamide fiber is commonly called nylon and chinlon, and is a general name of thermoplastic fiber containing repeated amide groups- [ NHCO ] -, on the molecular main chain. Nylon 6 fiber is produced mainly as filament, and only a small amount of short fiber is produced for blending with other fibers (natural fiber and chemical fiber). The nylon fiber is superior to other natural fiber and regenerated fiber fabric in high breaking strength, high elasticity, high wear resistance and excellent mothproof performance. However, the nylon products are of a few kinds and cannot meet the needs of people.
Therefore, the research on the nylon 6 composite fiber and the preparation method thereof has very important significance.
Disclosure of Invention
The invention provides a nylon 6 composite fiber and a preparation method thereof, and aims to solve the problems of poor bulkiness and air permeability of nylon fibers in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of nylon 6 composite fiber comprises spinning PA6 according to POY process and FDY process respectively, plying and doubling, and performing network compounding, winding molding and relaxation heat treatment to obtain nylon 6 composite fiber;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape; spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0: 1.1-1.4: 2.0-2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5-3.5: 1, and the included angle of the central lines of two adjacent leaves is 120 degrees; the three leaves of different trilobal spinneret orifices have the same shape and size;
all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center.
The principle of the invention is as follows:
the nylon 6 composite fiber is prepared by plying and doubling POY (polyester pre-oriented yarn) and FDY (fully drawn yarn) and then carrying out network compounding, winding forming and relaxation heat treatment. The cross section of the POY yarn is in a round hollow shape, so that the fabric has excellent heat-insulating property; the cross section of the FDY filament is a trilobal special shape with three leaves of unequal length and unequal width, PA6 melt is extruded from trilobal spinneret orifices with three leaves of unequal length and unequal width on a spinneret plate, all the trilobal spinneret orifices are distributed in a concentric circle, the center line of the longest leaf of each trilobal spinneret orifice passes through the center of the circle and points to the center of the circle, and meanwhile, circular blowing is adopted for cooling, the trilobal cooling conditions are seriously asymmetric and unbalanced, so that after fibers are self-sprayed, the cooling speeds of the melt at different positions on the cross section are inconsistent, and the main body is as follows: during spinning, the cooling air speed is high and is between 1.8 and 2.0m/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 any one of the trilobes in the trilobe spinneret orifice is facing the cooling wind, the melt of that lobe cools faster, while the rest of the trilobe cools slower. Under the tension of drawing, other parts in the trilobal shape are easier to be drawn and thinned, and the stress is more concentrated, so that a trilobal stress asymmetric structure can be formed on a fiber trilobal cross section, the fiber with asymmetric stress on the cross section can present a three-dimensional curling shape in the heat treatment or drawing process, and the fiber is well curled, so that good elasticity and fluffiness are obtained, and the fiber is called self-curling effect. The presence of this self-curling effect makes possible the permanence of the curl.
Compared with a cluster fiber mixing method before post-processing, the fiber mixing method can select components with different monofilament line densities and physical properties in a larger range to mix fibers, so that a more colorful fabric style is obtained. The fabric made of trilobal nylon spinning has high bulkiness, soft hand feeling, improved rebound resilience, water absorption and air permeability.
As a preferred technical scheme:
according to the preparation method of the nylon 6 composite fiber, the intrinsic viscosity of the PA6 is 2.40-2.50 dL/g.
According to the preparation method of the nylon 6 composite fiber, the parameters of the FDY process are as follows: the spinning temperature is 285-290 ℃, the cooling temperature is 20-25 ℃, the cooling air speed is 1.8-2.0 m/s, the network pressure is 3.5-4.5 bar, the first roller speed is 3000-3600 m/min, the first roller temperature is 85-95 ℃, the two roller speed is 3600-4000 m/min, the two roller temperature is 135-155 ℃, the yarn guide roller speed is the same as the two roller speed, and the winding speed is 3530-3910 m/min; the parameters of the POY process are as follows: the cooling wind speed is 0.3-0.5 m/s (the POY and FDY are stranded, doubled and compounded with a network to prepare the nylon 6 composite fiber, the parameters of the POY process except the cooling wind speed are only the spinning speed and the spinning temperature, and the specific values are respectively the winding speed and the spinning temperature of the FDY process).
According to the preparation method of the nylon 6 composite fiber, the mass ratio of the POY yarns prepared by the POY process to the FDY yarns prepared by the FDY process is 30: 70-50: 50.
According to the preparation method of the nylon 6 composite fiber, the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
The invention also provides the nylon 6 composite fiber prepared by the preparation method of the nylon 6 composite fiber, which has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections.
As a preferred technical scheme:
the nylon 6 composite fiber has the crimp shrinkage rate of 31-34%, the crimp stability of 78-82%, the shrinkage elongation of 66-72% and the crimp elastic recovery of 83-87%.
The nylon 6 composite fiber has breaking strength of 2.5-3.0 cN/dtex, elongation at break of 35-55%, boiling water shrinkage of 5-6%, and single fiber fineness of 2.5-3.0 dtex.
Has the advantages that:
(1) the preparation method of the nylon 6 composite fiber has the advantages of simple process and low cost, and is suitable for popularization and application;
(2) according to the preparation method of the nylon 6 composite fiber, more colorful fabric styles can be obtained, and the application range of the nylon fabric is expanded;
(3) the nylon 6 composite fiber prepared by the preparation method of the nylon 6 composite fiber has the advantages of good bulkiness, excellent rebound resilience, improved water absorption and air permeability.
Drawings
FIG. 1 is a schematic view of the trilobal spinneret orifice of the present invention;
FIG. 2 is a schematic representation of the distribution of trilobal orifices of the present invention on a 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, placing the two fiber samples into hot water with the temperature of 100 ℃ for treatment for 30min, taking out the two fiber samples and naturally drying the two fiber samplesDrying, cutting a sample about 30cm long, fixing one end, loading 0.0018cN/dtex load on one end, keeping for 30s, marking at 20cm, and obtaining 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 thereof on the spinneret plate are shown in the attached figures 1-2, the length ratio of three leaves of the same trilobal spinneret orifice is 1.0: 1.1-1.4: 2.0-2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5-3.5: 1, and the included angle of the central lines of two adjacent leaves is 120 degrees; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center. The drawings are only schematic and should not be construed as limiting the invention.
Example 1
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.4dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 30:70), then stranding and doubling, and finally obtaining the nylon 6 composite fiber through network compounding, winding forming and relaxation heat treatment;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.1:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3530m/min, the spinning temperature is 285 ℃, and the cooling air speed is 0.3 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 285 ℃, the cooling temperature is 20 ℃, the cooling air speed is 1.8m/s, the network pressure is 3.5bar, the one-roller speed is 3000m/min, the one-roller temperature is 85 ℃, the two-roller speed is 3600m/min, the two-roller temperature is 135 ℃, the godet roller speed is 3600m/min, and the winding speed is 3530 m/min;
the temperature of the relaxation heat treatment is 90 deg.C, and the time is 30 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 31%, a crimp stability of 78%, a shrinkage elongation of 66%, a crimp elastic recovery of 83%, a breaking strength of 2.5cN/dtex, an elongation at break of 55%, a boiling water contraction rate of 5%, and a single fiber fineness of 2.5 dtex.
Example 2
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.4dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 30:70), then stranding and doubling, and finally obtaining the nylon 6 composite fiber through network compounding, winding forming and relaxation heat treatment;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.1:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.9:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3547m/min, the spinning temperature is 285 ℃, and the cooling air speed is 0.3 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 285 ℃, the cooling temperature is 20 ℃, the cooling wind speed is 1.8m/s, the network pressure is 3.6bar, the one-roller speed is 3055m/min, the one-roller temperature is 88 ℃, the two-roller speed is 3600m/min, the two-roller temperature is 137 ℃, the godet roller speed is 3600m/min, and the winding speed is 3547 m/min;
the temperature of the relaxation heat treatment was 94 ℃ for 27 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 31%, a crimp stability of 80%, a shrinkage elongation of 69%, a crimp elastic recovery of 83%, a breaking strength of 2.5cN/dtex, an elongation at break of 54%, a boiling water contraction rate of 5%, and a single fiber fineness of 3 dtex.
Example 3
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.4dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 30:70), then stranding and doubling, and finally obtaining the nylon 6 composite fiber through network compounding, winding forming and relaxation heat treatment;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.1:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.8:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3570m/min, the spinning temperature is 288 ℃, and the cooling air speed is 0.3 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 288 ℃, the cooling temperature is 21 ℃, the cooling air speed is 1.9m/s, the network pressure is 3.6bar, the first roller speed is 3244m/min, the first roller temperature is 89 ℃, the two roller speed is 3666m/min, the two roller temperature is 141 ℃, the godet roller speed is 3666m/min, and the winding speed is 3570 m/min;
the temperature of the relaxation heat treatment was 94 ℃ for 25 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 31%, a crimp stability of 80%, a shrinkage elongation of 69%, a crimp elastic recovery of 83%, a breaking strength of 2.5cN/dtex, an elongation at break of 53%, a boiling water contraction rate of 5%, and a single fiber fineness of 2.7 dtex.
Example 4
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.41dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 40:60), then stranding and doubling, and then carrying out network compounding, winding forming and relaxation heat treatment to prepare the nylon 6 composite fiber;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.4:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.8:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3571m/min, the spinning temperature is 289 ℃, and the cooling air speed is 0.3 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 289 ℃, the cooling temperature is 21 ℃, the cooling air speed is 2m/s, the network pressure is 3.6bar, the first roller speed is 3253m/min, the first roller temperature is 92 ℃, the two roller speed is 3672m/min, the two roller temperature is 146 ℃, the godet roller speed is 3672m/min, and the winding speed is 3571 m/min;
the temperature of the relaxation heat treatment is 101 deg.C, and the time is 24 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 32%, a crimp stability of 80%, a shrinkage elongation of 70%, a crimp elastic recovery of 86%, a breaking strength of 2.5cN/dtex, an elongation at break of 47%, a boiling water contraction rate of 5%, and a single fiber fineness of 2.5 dtex.
Example 5
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.44dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 40:60), then stranding and doubling, and then carrying out network compounding, winding forming and relaxation heat treatment to prepare the nylon 6 composite fiber;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.4:2.0, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.7:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3606m/min, the spinning temperature is 290 ℃, and the cooling air speed is 0.4 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 290 ℃, the cooling temperature is 22 ℃, the cooling wind speed is 2m/s, the network pressure is 3.9bar, the one-roller speed is 3288m/min, the one-roller temperature is 93 ℃, the two-roller speed is 3756m/min, the two-roller temperature is 146 ℃, the godet roller speed is 3756m/min, and the winding speed is 3606 m/min;
the temperature of the relaxation heat treatment was 102 ℃ and the time was 21 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 33%, a crimp stability of 81%, a shrinkage elongation of 71%, a crimp elastic recovery of 86%, a breaking strength of 2.6cN/dtex, an elongation at break of 45%, a boiling water contraction rate of 6%, and a single fiber fineness of 2.7 dtex.
Example 6
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.45dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 40:60), then stranding and doubling, and then carrying out network compounding, winding forming and relaxation heat treatment to prepare the nylon 6 composite fiber;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.4:2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.9:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3726m/min, the spinning temperature is 290 ℃, and the cooling air speed is 0.4 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 290 ℃, the cooling temperature is 22 ℃, the cooling wind speed is 2m/s, the network pressure is 4.3bar, the one-roller speed is 3292m/min, the one-roller temperature is 95 ℃, the two-roller speed is 3941m/min, the two-roller temperature is 146 ℃, the godet roller speed is 3941m/min, and the winding speed is 3726 m/min;
the temperature of the relaxation heat treatment was 104 ℃ and the time was 21 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 33%, a crimp stability of 81%, a shrinkage elongation of 72%, a crimp elastic recovery of 86%, a breaking strength of 2.8cN/dtex, an elongation at break of 39%, a boiling water contraction rate of 6%, and a single fiber fineness of 2.7 dtex.
Example 7
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.4dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 50:50), then stranding and doubling, and then carrying out network compounding, winding forming and relaxation heat treatment to prepare the nylon 6 composite fiber;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.4:2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 3.0:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3860m/min, the spinning temperature is 290 ℃, and the cooling air speed is 0.5 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 290 ℃, the cooling temperature is 23 ℃, the cooling air speed is 2m/s, the network pressure is 4.4bar, the one-roller speed is 3300m/min, the one-roller temperature is 95 ℃, the two-roller speed is 3965m/min, the two-roller temperature is 152 ℃, the godet roller speed is 3965m/min, and the winding speed is 3860 m/min;
the temperature of the relaxation heat treatment is 111 deg.C, and the time is 20 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 34%, a crimp stability of 82%, a shrinkage elongation of 72%, a crimp elastic recovery of 87%, a breaking strength of 3cN/dtex, an elongation at break of 39%, a boiling water contraction rate of 6%, and a single fiber fineness of 3 dtex.
Example 8
A preparation method of nylon 6 composite fiber comprises the steps of spinning PA6 with the intrinsic viscosity of 2.5dL/g according to a POY process and an FDY process respectively (the mass ratio of POY yarns prepared according to the POY process to FDY yarns prepared according to the FDY process is 50:50), then stranding and doubling, and then carrying out network compounding, winding forming and relaxation heat treatment to prepare the nylon 6 composite fiber;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape;
spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0:1.4:2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 3.5:1, and the included angle of the central lines of the two adjacent leaves is 120 ℃; the three leaves of different trilobal spinneret orifices have the same shape and size; all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center;
the parameters of the POY process are as follows: the spinning speed is 3910m/min, the spinning temperature is 290 ℃, and the cooling air speed is 0.5 m/s;
the parameters of the FDY process are as follows: the spinning temperature is 290 ℃, the cooling temperature is 25 ℃, the cooling air speed is 2m/s, the network pressure is 4.5bar, the one-roller speed is 3600m/min, the one-roller temperature is 95 ℃, the two-roller speed is 4000m/min, the two-roller temperature is 155 ℃, the godet roller speed is 4000m/min, and the winding speed is 3910 m/min;
the temperature of the relaxation heat treatment is 120 deg.C, and the time is 20 min.
The finally prepared nylon 6 composite fiber has a three-dimensional crimp shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections; the nylon 6 composite fiber had a crimp contraction rate of 34%, a crimp stability of 82%, a shrinkage elongation of 72%, a crimp elastic recovery of 87%, a breaking strength of 3cN/dtex, an elongation at break of 35%, a boiling water contraction rate of 6%, and a single fiber fineness of 3 dtex.
Claims (8)
1. A preparation method of nylon 6 composite fiber is characterized by comprising the following steps: the PA6 is respectively spun according to the POY process and the FDY process, then is plied and doubled, and is subjected to network compounding, winding forming and relaxation heat treatment to prepare the nylon 6 composite fiber;
spinneret orifices on the spinneret plate corresponding to the POY process are in a round hollow shape; spinneret orifices on a spinneret plate corresponding to the FDY process are trilobal, and the FDY process adopts circular blowing for cooling;
the length ratio of three leaves of the same trilobal spinneret orifice is 1.0: 1.1-1.4: 2.0-2.5, the width ratio of the corresponding three leaves is 1.5:1.5:1, the length ratio of the shortest leaf to the width ratio is 2.5-3.5: 1, and the included angle of the central lines of two adjacent leaves is 120 degrees; the three leaves of different trilobal spinneret orifices have the same shape and size;
all the trilobal spinneret orifices are distributed in concentric circles, and the center line of the longest leaf of each trilobal spinneret orifice passes through the circle center and points to the circle center.
2. The method for preparing nylon 6 composite fiber according to claim 1, wherein the intrinsic viscosity of PA6 is 2.40-2.50 dL/g.
3. The preparation method of the nylon 6 composite fiber according to claim 2, wherein the parameters of the FDY process are as follows: the spinning temperature is 285-290 ℃, the cooling temperature is 20-25 ℃, the cooling air speed is 1.8-2.0 m/s, the network pressure is 3.5-4.5 bar, the first roller speed is 3000-3600 m/min, the first roller temperature is 85-95 ℃, the two roller speed is 3600-4000 m/min, the two roller temperature is 135-155 ℃, the yarn guide roller speed is the same as the two roller speed, and the winding speed is 3530-3910 m/min; the parameters of the POY process are as follows: the cooling wind speed is 0.3-0.5 m/s.
4. The preparation method of the nylon 6 composite fiber as claimed in claim 1, wherein the mass ratio of the POY filaments prepared by the POY process to the FDY filaments prepared by the FDY process is 30: 70-50: 50.
5. The method for preparing nylon 6 composite fiber according to claim 1, wherein the temperature of the relaxation heat treatment is 90-120 ℃ for 20-30 min.
6. The nylon 6 composite fiber prepared by the preparation method of the nylon 6 composite fiber according to any one of claims 1 to 5, which is characterized in that: has a three-dimensional curling shape and consists of a plurality of PA6FDY monofilaments with trilobal cross sections and a plurality of PA6 POY monofilaments with round hollow cross sections.
7. The nylon 6 composite fiber according to claim 6, wherein the nylon 6 composite fiber has a crimp shrinkage of 31 to 34%, a crimp stability of 78 to 82%, a shrinkage elongation of 66 to 72%, and a crimp elastic recovery of 83 to 87%.
8. The nylon 6 composite fiber according to claim 6, wherein the nylon 6 composite fiber has a breaking strength of 2.5 to 3.0cN/dtex, an elongation at break of 35 to 55%, a boiling water shrinkage of 5 to 6%, and a single fiber fineness of 2.5 to 3.0 dtex.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021135084A1 (en) * | 2019-12-29 | 2021-07-08 | 江苏恒力化纤股份有限公司 | Fiber for medical antibacterial fabric and preparation method therefor |
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