CN111005083A - Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof - Google Patents

Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof Download PDF

Info

Publication number
CN111005083A
CN111005083A CN201911350195.1A CN201911350195A CN111005083A CN 111005083 A CN111005083 A CN 111005083A CN 201911350195 A CN201911350195 A CN 201911350195A CN 111005083 A CN111005083 A CN 111005083A
Authority
CN
China
Prior art keywords
distribution hole
poy
distribution
hole
pet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911350195.1A
Other languages
Chinese (zh)
Inventor
范红卫
汤方明
王山水
沈建根
孙晓华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Hengli Chemical Fiber Co Ltd
Original Assignee
Jiangsu Hengli Chemical Fiber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Hengli Chemical Fiber Co Ltd filed Critical Jiangsu Hengli Chemical Fiber Co Ltd
Priority to CN201911350195.1A priority Critical patent/CN111005083A/en
Publication of CN111005083A publication Critical patent/CN111005083A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • D01D5/32—Side-by-side structure; Spinnerette packs therefor
    • 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
    • D01D5/22—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
    • 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
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Multicomponent Fibers (AREA)

Abstract

The invention relates to a parallel self-crimping POY-DT silk elastic fiber and a preparation method thereof, which is prepared by distributing PET and PBT melts according to a POY-DT process, extruding the PET and PBT melts from spinneret orifices m and n on the same spinneret plate to prepare POY-DT silk and then performing relaxation heat treatment; the PET and PET melts flow to a spinneret orifice m through a distribution orifice A, B and flow to a spinneret orifice n through a distribution orifice C, D, the apparent viscosity difference of the PET and the PET melts is less than or equal to 5% at the inlet of each distribution orifice, the distribution orifices A and B are cylindrical orifices with equal heights, the diameter ratio is 1.15-1.24: 1, the distribution orifices C and D are cylindrical orifices with equal heights, and the diameter ratio is 1: 1.15-1.24; the prepared fiber consists of a plurality of PBT/PET parallel composite monofilaments with two mixture ratios, and the curling directions of the monofilaments in the fiber are randomly distributed. The invention solves the problem of uneven stripe shade of the PBT/PET parallel composite fiber in the knitted fabric.

Description

Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof
Technical Field
The invention belongs to the technical field of polyester fibers, and relates to a parallel self-crimping POY-DT silk elastic fiber and a preparation method thereof.
Background
Generally, chemical fibers have smooth surfaces, no crimp, small gaps between fibers, and poor bulkiness and fullness of products, and some crimp is usually formed by physical or chemical methods, but such crimp is not durable and has a low degree of crimp. The composite fiber is different from a common single-component chemical fiber, two components with different properties such as shrinkage rule, modulus and the like exist in the section of the composite fiber, the fiber is curled due to the difference of stress-strain behaviors of two polymers distributed on two sides, the curling is not generated by utilizing the heat setting property, and the curling is the self characteristic of the composite fiber and is called self-curling.
The PBT/PET composite fiber has the advantages of both PBT and PET, and simultaneously generates a plurality of new performances, so that the product has great superiority in both economic benefit and practical value. When the POY-DT yarn of the PBT/PET parallel type bicomponent fiber is applied to the knitting field, the surface of a knitted fabric woven is irregular in strip shade shape, and is particularly obvious on plain knitted fabric, so that a plurality of knitted products cannot be popularized and applied, therefore, the PBT/PET fiber knitted fabric is evaluated to be a low-grade product with uneven strip dryness once, and the problem becomes a great obstacle for restricting the development and application of the PBT/PET fiber knitted fabric.
Therefore, the research on the POY-DT filaments of the PBT/PET side-by-side bicomponent fibers for avoiding the occurrence of random strip shade unevenness and the preparation method thereof have very important significance.
Disclosure of Invention
The invention provides a parallel self-crimping POY-DT silk elastic fiber and a preparation method thereof, and aims to solve the problem that random strip shade shape unevenness occurs when PBT/PET parallel composite fibers are applied to knitted fabric products in the prior art. According to the invention, a mode that PBT/PET parallel composite monofilament with the mass ratio of PBT to PET being 9: 5-7: 3 and PBT/PET parallel composite monofilament with the mass ratio of PBT to PET being 5: 9-3: 7 coexist in a bundle of fibers is adopted, and due to the different shrinkage modes and forms of the two PBT/PET parallel composite fibers with different mass ratios of PBT to PET, the formation of regular left and right spiral forms of the bundle of PBT/PET parallel composite fibers is broken, and the problem of uneven strip shade of a knitted fabric made of the bundle of PBT/PET parallel composite fibers is further solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of parallel self-crimping POY-DT silk elastic fiber is characterized in that PET melt and PBT melt are distributed according to a POY-DT process, and then extruded from a spinneret orifice m and a spinneret orifice n on the same spinneret plate to prepare the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D;
at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by no more than 5% (the apparent viscosities are determined by simulation, and are obtained by measuring the apparent viscosities of the polymer melts at specific temperatures by a rheometer);
the distribution hole A and the distribution hole B are equal-height cylindrical holes, the diameter ratio of the distribution hole A to the distribution hole B is 1.15-1.24: 1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.15-1.24.
Specifically, the PBT melt is distributed through the distribution holes A and C and the PET melt is distributed through the distribution holes B and D and is arranged at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosity difference between the PET melt and the PBT melt is not more than 5%, each distribution hole is a cylindrical hole with the same height, and the diameter ratio of the distribution hole A to the distribution hole B is not equal to the diameter ratio of the distribution hole C to the distribution hole D, so that the mass ratio of the PBT melt distributed to the spinning hole m to the PET melt is different from the mass ratio of the PBT melt distributed to the spinning hole n to the PET melt, two different mass ratios of PA6 to PET are coexisted in a bundle of PBT/PET parallel composite fibers, the difference of the crimp forms is ensured, and correspondingly, the quantity and position relations of the distribution holes and the distribution holes are reasonably set, and the smooth distribution is ensured; according to the invention, the spinneret orifices m and the spinneret orifices n are distributed according to concentric circles, and the spinneret orifices on the same circle are controlled to be m or n, so that a part of PBT/PET parallel composite monofilaments with the mass ratio of 9: 5-7: 3 can be mixed into the middle of another part of PBT/PET parallel composite monofilaments with the mass ratio of 5: 9-3: 7, and the effect of breaking the formation of a regular left and right spiral form is achieved; the temperature of the spinning manifold I, the temperature of the spinning manifold II and the temperature of the spinning manifold III are reasonably set, so that the temperature of the spinning manifold I, the temperature of the spinning manifold II and the temperature of the spinning manifold III can be matched with the intrinsic viscosity (0.50-0.55 dL/g) of a PET melt and the intrinsic viscosity (1.10-1.25 dL/g) of a PBT melt, the apparent viscosities of a PET component and a PBT component extruded from a spinneret orifice are relatively close, the effect of controlling the mass ratio of parallel composite monofilaments is achieved, and the smooth spinning is guaranteed; the shape of the spinneret orifice is not required to be adjusted, and the commonly used parallel composite spinneret orifice is selected; according to the invention, a POY-DT spinning process is selected, and spinning process parameters are reasonably set, so that the prepared fiber has excellent elasticity, high crimp shrinkage rate, high crimp stability, high shrinkage elongation and high crimp elastic recovery rate, and meanwhile, the breaking strength is high and the breaking elongation is low.
The principle of the invention is as follows:
the mass ratio of PBT to PET in the existing PBT/PET parallel composite fiber is a fixed value, so that the torsional stress generated by the spiral crimp of the fiber is the same, and the fiber on a part of yarn section generates a regular spiral crimp surface morphology structure. Due to the difference of fiber inclination state and mechanical response behavior of each crimped yarn section of the PBT/PET fiber, when the double-component PBT/PET fiber is used for weaving a fabric, the difference of yarn reflection effect and tension unevenness is caused, protrusions or depressions are randomly formed on the surface of the fabric, and uneven transverse stripes with randomly changed brightness and darkness, namely uneven striped shade, are found on the surface.
During the spinning process, the spinning melt is in continuous flow, and in order to better control the flow rate of the melt, the melt flows in the round pipeDynamic melt flow calculation formula:
Figure BDA0002334456730000021
wherein, Delta Q is the flux, d is the diameter of the round tube, mu is the apparent viscosity of the flux at the inlet of the round tube, l is the length of the round tube, and Delta P is the pressure drop of the flux after passing through the round tube, and as can be seen from the formula, when Delta P, mu and l are kept equal, the ratio of the flux flowing in the two round tubes is close to the ratio of the fourth power of the diameter of the round tube;
according to the POY-DT technology, after a PBT melt and a PET melt are distributed, extruding from a spinneret orifice m and a spinneret orifice n on the same spinneret plate to prepare the parallel self-crimping POY-DT elastic fiber, wherein the distribution refers to that the PBT melt is distributed into the spinneret orifice m through a distribution orifice A, the PET melt is distributed into the spinneret orifice m through a distribution orifice B, the PBT melt is distributed into the spinneret orifice n through a distribution orifice C, and the PET melt is distributed into the spinneret orifice n through a distribution orifice D;
the ratio of the PBT melt flow through the distribution openings A (or C) to the PET melt flow through the distribution openings B (or D)
Figure BDA0002334456730000031
Wherein Δ Q1, D1, μ 1, l1, Δ P1 correspond to dispensing hole a (or C), and Δ Q2, D2, μ 2, l2, Δ P2 correspond to dispensing hole B (or D); because the intrinsic viscosity of the PBT melt, the intrinsic viscosity of the PET melt, the temperature of the spinning beam I, the temperature of the spinning beam II and the temperature of the spinning beam III are matched with each other, the apparent viscosities of the PET melt and the PBT melt at the inlets of the distribution hole A and the distribution hole B are nearly identical (the difference is less than 5%), and the apparent viscosities of the PET melt and the PBT melt at the inlets of the distribution hole C and the distribution hole D are nearly identical (the difference is less than 5%), therefore mu 1 is approximately equal to mu 2; because the apparent viscosities of the PET melt and the PBT melt at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are different by no more than 5%, and because the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are all arranged on the distribution plate and have smaller sizes, the pressure drop of the PBT melt after passing through the distribution hole A is basically the same as that of the PET melt after passing through the distribution hole B, the pressure drop of the PBT melt after passing through the distribution hole C is basically the same as that of the PET melt after passing through the distribution hole D, and because the pressure drop of the PBTΔ P1 is approximately equal to Δ P2; since dispensing hole a and dispensing hole B are equal in height, dispensing hole C and dispensing hole D are equal in height, l1 is equal to l 2;
through the calculation, the method can know that,
Figure BDA0002334456730000032
and
Figure BDA0002334456730000033
approximately equal, the ratio of the diameters of the distribution hole A to the distribution hole B is 1.15-1.24: 1, so that the ratio of the flow of the PBT melt flowing through the distribution hole A to the flow of the PET melt flowing through the distribution hole B is about 9: 5-7: 3, the mass ratio of the PBT to the PET in the monofilaments finally extruded from the spinneret hole m is 9: 5-7: 3, and similarly, the ratio of the diameter of the distribution hole C to the diameter of the distribution hole D is 1: 1.15-1.24, so that the ratio of the PBT melt flowing through the distribution hole C to the flow of the PET melt flowing through the distribution hole D is about 5: 9-3: 7, and the mass ratio of the PBT to the PET in the monofilaments finally extruded from the spinneret hole n is 5: 9-3: 7;
in addition, the thermal shrinkage rates of the PBT and the PET adopted by the invention are different, furthermore, after the PBT and the PET are mixed, the two polymers with different thermal shrinkage rates have compatibility, the existence of the compatibility enables the polymers to be bonded together when passing through the same spinneret orifice (namely two fiber-forming polymer melts are distributed together according to a parallel composite spinning mode and then extruded), and the bonding effect and the different thermal shrinkage rates enable two polymer fibers (namely PBT/PET parallel composite monofilaments) coming out of the same spinneret orifice to form a self-curling shape after being subjected to heat treatment, so that the self-curling shape has elasticity, and the self-curling shape is specifically as follows: the PBT component is arranged at the inner side of the spiral crimp, and the PET component is arranged at the outer side of the spiral crimp (the shrinkage rate of the PBT is larger and the shrinkage rate of the PET is smaller according to the rigidity and flexibility characteristics of PBT and PET molecules, so that the PBT component in the composite fiber is arranged at the inner side of the spiral crimp, and the PET component is arranged at the outer side of the spiral crimp);
in the same bundle of fibers, the mass ratio of PBT to PET in one part of PBT/PET parallel composite monofilaments is 9: 5-7: 3, and the mass ratio of PBT to PET in the other part of PBT/PET parallel composite monofilaments is 5: 9-3: 7, so that the curling forms of different monofilaments have certain difference, the difference plays a role in breaking the neat left and right spiral forms formed by pure PBT/PET parallel composite monofilaments, the curling directions of the monofilaments of the prepared parallel double-component elastic fibers after relaxation heat treatment are randomly distributed, and the surface of a knitted fabric woven by the double-component elastic fibers cannot have random strip shade unevenness.
As a preferred technical scheme:
according to the preparation method of the side-by-side self-crimping POY-DT elastic fiber, the mass ratio of the PBT melt to the PET melt is 50: 50.
According to the preparation method of the parallel self-curling POY-DT elastic fiber, the spinneret holes m or n are circular, oval or 8-shaped spinneret holes, the shape of the spinneret holes m or n is not required to be specially adjusted, and the requirements can be met by selecting the commonly used parallel composite spinneret holes.
According to the preparation method of the parallel self-crimping POY-DT silk elastic fiber, all the spinneret holes are distributed in concentric circles, the spinneret holes on the same circle are m or n, so that the PBT/PET parallel composite monofilament with the mass ratio of 9: 5-7: 3 of PBT to PET can be mixed into the middle of the PBT/PET parallel composite monofilament with the mass ratio of 5: 9-3: 7 of PBT to PET, and the effect of forming a neat left and right spiral shape is achieved.
The preparation method of the parallel self-curling POY-DT silk elastic fiber comprises the following steps that a spinneret orifice m is composed of a guide orifice E, a transition orifice and a capillary micropore which are connected in sequence, a spinneret orifice n is composed of a guide orifice F, a transition orifice and a capillary micropore which are connected in sequence, the guide orifice E is connected with a distribution orifice A and a distribution orifice B at the same time, and the guide orifice F is connected with a distribution orifice C and a distribution orifice D at the same time; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on the distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II.
According to the preparation method of the parallel self-crimping POY-DT silk elastic fiber, the intrinsic viscosity of the PET melt is 0.50-0.55 dL/g, the temperature of the spinning manifold I is 275-280 ℃, the intrinsic viscosity of the PBT melt is 1.10-1.25 dL/g, the temperature of the spinning manifold II is 260-265 ℃, and the temperature of the spinning manifold III (the temperature of the spinning manifold III is the spinning temperature) is 274-277 ℃.
The preparation method of the parallel self-curling POY-DT elastic fiber comprises the following steps: the cooling temperature is 23-25 ℃, the winding speed is 2800-3100 m/min, the setting temperature is 130-140 ℃, the stretching temperature is 85-95 ℃, and the stretching ratio is 1.4-1.8; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
The invention also provides the parallel self-crimping POY-DT silk elastic fiber prepared by the preparation method of the parallel self-crimping POY-DT silk elastic fiber, which is composed of a plurality of PBT/PET parallel composite monofilaments with two proportions, wherein in the same fiber bundle, the mass ratio of PBT to PET in one part of the PBT/PET parallel composite monofilaments is 9: 5-7: 3, and the mass ratio of PBT to PET in the other part of the PBT/PET parallel composite monofilaments is 5: 9-3: 7; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed.
As a preferred technical scheme:
the parallel self-curling POY-DT elastic fiber has the temperature of relaxation heat treatment of 90-120 ℃ and the time of 20-30 min; after relaxation heat treatment, the parallel self-crimping POY-DT elastic fiber has a crimp shrinkage of 66-70%, a crimp stability of 92.3-94.5%, a shrinkage elongation of 110-115%, and a crimp elastic recovery of 80-85%; the composite fiber obtained by the POY-DT process (post-drawing process) has good crimp shrinkage, crimp stability, shrinkage elongation and crimp elastic recovery. The fiber tows obtained by the POY-DT process have larger curling stress generated by the difference of shrinkage rates when the stress is eliminated by heat when the fiber tows are subjected to external force, so the curling shrinkage rate, the curling stability, the contraction elongation and the elastic recovery rate of the curling are higher.
The parallel self-curling POY-DT elastic fiber has the breaking strength of more than or equal to 2.8cN/dtex, the elongation at break of 50.0 +/-5.0 percent and the total fineness of 80-150 dtex. Under the same conditions, the breaking strength of the composite fiber obtained by the POY-DT process is higher than that of the fiber obtained by the FDY process, and the breaking elongation is lower than that of the FDY fiber, because: the drawing process of FDY is direct drawing on a spinning line, only hot roller heating is carried out in the drawing process, POY-DT fiber is obtained by drawing POY (pre-oriented yarn) and heating is carried out by the hot roller and a hot plate/hot box in the drawing process, so that the crystallinity and the orientation degree of the composite fiber obtained by the POY-DT process are higher than those of the FDY fiber, and the breaking strength is high and the breaking elongation is low.
The prepared parallel self-crimping POY-DT silk elastic fiber is made into a knitted fabric for strip-negative uneven condition test, and the test process is as follows: firstly, acquiring the knitted fabric image and converting the knitted fabric image into a gray image, then carrying out first processing and second processing on the gray image and then calculating a parameter D, and representing the uneven degree of the strip shade shape by using the parameter D, wherein the gray image comprises a strip shade area, a high gray value area of a non-strip shade area and a low gray value area of the non-strip shade area; the first processing is to change the pixel points of the high gray value area of the non-strip shadow area in the gray image into pure white points; the second processing is to change the pixel points of the low gray value area of the non-shadow area in the gray image into pure white points; the calculation formula of the parameter D is as follows: d ═ Σ B/a, where Σ B represents the number of pixels having a gray scale value of 0 in the grayscale image, and a represents the total number of pixels in the grayscale image.
If the D value is more than or equal to 3%, the strip shade unevenness can be judged to appear, and if the D value is more than or equal to 10%, the strip shade unevenness can be judged to appear seriously. The test results of the knitted fabric made of the parallel self-curling POY-DT silk elastic fiber of the invention are as follows: d value of the knitted fabric made of the parallel self-curling POY-DT silk elastic fibers is less than or equal to 1.0 percent; this shows that the side-by-side self-crimped POY-DT elastic fibers produced by the present invention do not have the problem of "uneven sliver".
Has the advantages that:
(1) according to the preparation method of the parallel self-crimping POY-DT silk elastic fiber, distribution holes with different diameters are adopted, so that the obtained parallel composite fiber contains different component ratios, the generation of a regular and spiral crimping surface morphological structure of the fiber is avoided, and strip shade unevenness is avoided;
(2) the parallel self-curling POY-DT elastic fiber prepared by the preparation method of the parallel self-curling POY-DT elastic fiber has the advantages of good curling performance, good elasticity, excellent comprehensive performance and wide application range.
Drawings
FIG. 1 is a schematic view of the melt distribution of the present invention; a, B, C, D are independent distribution holes, E, F are independent guide holes.
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 out the two fiber samples, naturally drying the two fiber samples, then cutting the sample with the length of about 30cm, fixing one end of the sample, loading a load of 0.0018cN/dtex on the other end of the sample, continuing for 30s, marking the sample at the position of 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)。
example 1
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.5dL/g) and PBT melt (intrinsic viscosity is 1.16dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding the PET melt and the PBT melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 4.7%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.15:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.15;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
as shown in fig. 1, the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole a and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 275 ℃, the temperature of the spinning manifold II is 261 ℃, and the temperature of the spinning manifold III is 274 ℃;
the parameters of the POY-DT process are as follows: the cooling temperature is 25 ℃, the winding speed is 3050m/min, the setting temperature is 136 ℃, the stretching temperature is 91 ℃, and the stretching ratio is 1.4;
the temperature of the relaxation heat treatment is 116 deg.C, and the time is 22 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the parallel self-crimping POY-DT silk elastic fiber has a crimp shrinkage of 68%, a crimp stability of 93.9%, a shrinkage elongation of 115%, a crimp elastic recovery of 84%, a breaking strength of 2.8cN/dtex, an elongation at break of 55%, and a total fineness of 100 dtex.
Example 2
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.5dL/g) and PBT melt (intrinsic viscosity is 1.17dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding the PET melt and the PBT melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 4.6%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.22:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.22;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 276 ℃, the temperature of the spinning manifold II is 262 ℃, and the temperature of the spinning manifold III is 274 ℃;
the parameters of the POY-DT process are as follows: the cooling temperature is 25 ℃, the winding speed is 2950m/min, the setting temperature is 139 ℃, the stretching temperature is 90 ℃, and the stretching ratio is 1.5;
the temperature of the relaxation heat treatment is 120 deg.C, and the time is 20 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the side-by-side self-crimping POY-DT elastic fiber had a crimp shrinkage of 69%, a crimp stability of 94.5%, a shrinkage elongation of 113%, a crimp elastic recovery of 84%, a breaking strength of 2.92cN/dtex, an elongation at break of 51%, and a total fineness of 96 dtex.
Example 3
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.53dL/g) and PBT melt (intrinsic viscosity is 1.19dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding the PET melt and the PBT melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 4.4%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.21:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.21;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 280 ℃, the temperature of the spinning manifold II is 263 ℃, and the temperature of the spinning manifold III is 277 ℃;
the parameters of the POY-DT process are as follows: the cooling temperature is 23 ℃, the winding speed is 2960m/min, the setting temperature is 130 ℃, the stretching temperature is 91 ℃, and the stretching ratio is 1.6;
the temperature of the relaxation heat treatment was 104 ℃ and the time was 26 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the parallel self-crimping POY-DT silk elastic fiber has a crimp shrinkage of 68%, a crimp stability of 93.1%, a shrinkage elongation of 110%, a crimp elastic recovery of 83%, a breaking strength of 2.94cN/dtex, an elongation at break of 51%, and a total fineness of 150 dtex.
Example 4
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.52dL/g) and PBT melt (intrinsic viscosity is 1.14dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding the PET melt and the PBT melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 5%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.17:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.17;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning beam I is 279 ℃, the temperature of the spinning beam II is 261 ℃, and the temperature of the spinning beam III is 277 ℃;
the parameters of the POY-DT process are as follows: cooling at 25 deg.C, winding speed 3100m/min, setting temperature 134 deg.C, stretching temperature 89 deg.C, and stretching ratio 1.7;
the temperature of the relaxation heat treatment was 98 ℃ and the time was 27 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the side-by-side self-crimping POY-DT elastic fiber had a crimp shrinkage of 67%, a crimp stability of 92.6%, a shrinkage elongation of 114%, a crimp elastic recovery of 80%, a breaking strength of 3.02cN/dtex, an elongation at break of 51%, and a total fineness of 140 dtex.
Example 5
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.51dL/g) and PBT melt (intrinsic viscosity is 1.14dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding the PET melt and the PBT melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 4.4%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.18:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.18;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning beam I is 279 ℃, the temperature of the spinning beam II is 260 ℃, and the temperature of the spinning beam III is 274 ℃;
the parameters of the POY-DT process are as follows: the cooling temperature is 25 ℃, the winding speed is 2840m/min, the setting temperature is 135 ℃, the stretching temperature is 95 ℃, and the stretching ratio is 1.7;
the temperature of the relaxation heat treatment was 101 ℃ and the time was 26 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the side-by-side self-crimping POY-DT elastic fiber had a crimp shrinkage of 68%, a crimp stability of 92.9%, a reduction elongation of 115%, a crimp elastic recovery of 82%, a breaking strength of 3.04cN/dtex, an elongation at break of 49%, and a total fineness of 90 dtex.
Example 6
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.51dL/g) and PBT melt (intrinsic viscosity is 1.25dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding the PET melt and the PBT melt from a spinneret orifice m (round) and a spinneret orifice n (round) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 4.9%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.15:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.15;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 277 ℃, the temperature of the spinning manifold II is 264 ℃, and the temperature of the spinning manifold III is 274 ℃;
the parameters of the POY-DT process are as follows: cooling at 25 deg.C, winding speed 3030m/min, setting temperature 137 deg.C, stretching temperature 85 deg.C, and stretching ratio 1.7;
the temperature of the relaxation heat treatment was 107 ℃ for 24 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the parallel self-crimping POY-DT silk elastic fiber has a crimp shrinkage of 70%, a crimp stability of 93.2%, a shrinkage elongation of 111%, a crimp elastic recovery of 85%, a breaking strength of 3.07cN/dtex, an elongation at break of 48%, and a total fineness of 120 dtex.
Example 7
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.55dL/g) and PBT melt (intrinsic viscosity is 1.1dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding the PET melt and the PBT melt from a spinneret orifice m (circle) and a spinneret orifice n (ellipse) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 4.9%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.15:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.15;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 280 ℃, the temperature of the spinning manifold II is 260 ℃, and the temperature of the spinning manifold III is 276 ℃;
the parameters of the POY-DT process are as follows: the cooling temperature is 23 ℃, the winding speed is 2800m/min, the setting temperature is 133 ℃, the stretching temperature is 95 ℃, and the stretching ratio is 1.8;
the temperature of the relaxation heat treatment is 90 deg.C, and the time is 30 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the side-by-side self-crimping POY-DT elastic fiber had a crimp shrinkage of 66%, a crimp stability of 92.3%, a shrinkage elongation of 114%, a crimp elastic recovery of 80%, a breaking strength of 3.07cN/dtex, an elongation at break of 47%, and a total fineness of 80 dtex.
Example 8
A preparation method of parallel self-crimping POY-DT silk elastic fiber comprises the steps of distributing PET melt (intrinsic viscosity is 0.52dL/g) and PBT melt (intrinsic viscosity is 1.23dL/g) with the mass ratio of 50:50 according to a POY-DT process, extruding from a spinneret orifice m (8-shaped) and a spinneret orifice n (round) on the same spinneret plate to prepare POY-DT silk, and then performing relaxation heat treatment to obtain the parallel self-crimping POY-DT silk elastic fiber;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D; at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by 4.9%;
the distribution hole A and the distribution hole B are cylindrical holes with equal heights, the diameter ratio of the distribution hole A to the distribution hole B is 1.22:1, the distribution hole C and the distribution hole D are cylindrical holes with equal heights, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.22;
all the spinneret orifices are distributed in concentric circles, and the spinneret orifices on the same circle are all m or all n;
the spinneret orifice m is composed of a guide hole E, a transition hole and a capillary micropore which are connected in sequence, the spinneret orifice n is composed of a guide hole F, a transition hole and a capillary micropore which are connected in sequence, the guide hole E is simultaneously connected with the distribution hole A and the distribution hole B, and the guide hole F is simultaneously connected with the distribution hole C and the distribution hole D; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on a distribution plate in the spinning manifold III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning manifold I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning manifold II;
the temperature of the spinning manifold I is 279 ℃, the temperature of the spinning manifold II is 264 ℃, and the temperature of the spinning manifold III is 274 ℃;
the parameters of the POY-DT process are as follows: cooling at 25 deg.C, winding speed 2910m/min, setting temperature of 140 deg.C, stretching temperature of 86 deg.C, and stretching ratio of 1.8;
the temperature of the relaxation heat treatment is 110 deg.C, and the time is 24 min.
The finally prepared parallel self-crimping POY-DT elastic fiber consists of a plurality of PBT/PET parallel composite monofilaments; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed; the parallel self-crimping POY-DT silk elastic fiber has a crimp shrinkage of 69%, a crimp stability of 93.2%, a shrinkage elongation of 110%, a crimp elastic recovery of 85%, a breaking strength of 3.18cN/dtex, an elongation at break of 45%, and a total fineness of 110 dtex.

Claims (10)

1. A preparation method of parallel self-crimping POY-DT silk elastic fiber is characterized by comprising the following steps: according to the POY-DT technology, after PET melt and PBT melt are distributed, POY-DT filaments are prepared by extruding from a spinneret orifice m and a spinneret orifice n on the same spinneret plate, and then relaxation heat treatment is carried out, thus obtaining parallel self-crimping POY-DT filament elastic fibers;
the distribution refers to that the PBT melt is distributed into the spinneret orifices m through the distribution orifices A and the PET melt is distributed into the spinneret orifices m through the distribution orifices B; the PBT melt is distributed into spinneret orifices n through a distribution hole C and a distribution hole D;
at the inlets of the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D, the apparent viscosities of the PET melt and the PBT melt are different by no more than 5%;
the distribution hole A and the distribution hole B are equal-height cylindrical holes, the diameter ratio of the distribution hole A to the distribution hole B is 1.15-1.24: 1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, and the diameter ratio of the distribution hole C to the distribution hole D is 1: 1.15-1.24.
2. The process for preparing side-by-side self-crimped POY-DT filament elastic fibers according to claim 1, wherein the mass ratio of PBT melt to PET melt is 50: 50.
3. The method for preparing the side-by-side self-crimped POY-DT filament elastic fiber according to claim 1, wherein the spinneret holes m or n are circular, oval or 8-shaped.
4. The method of claim 1, wherein all the orifices are arranged concentrically, and the orifices on the same circle are m or n.
5. The method for preparing POY-DT filament elastic fiber in parallel with self-curling as claimed in claim 1, wherein the spinneret hole m is composed of guide hole E, transition hole and capillary micro-hole which are connected in sequence, the spinneret hole n is composed of guide hole F, transition hole and capillary micro-hole which are connected in sequence, the guide hole E is connected with the distribution hole A and the distribution hole B at the same time, and the guide hole F is connected with the distribution hole C and the distribution hole D at the same time; the distribution hole A, the distribution hole B, the distribution hole C and the distribution hole D are located on the distribution plate in the spinning beam III, the PET melt is conveyed to the distribution hole B and the distribution hole D through the spinning beam I, and the PBT melt is conveyed to the distribution hole A and the distribution hole C through the spinning beam II.
6. The method for preparing the parallel self-crimping POY-DT silk elastic fiber according to claim 5, wherein the intrinsic viscosity of the PET melt is 0.50-0.55 dL/g, the temperature of the spinning beam I is 275-280 ℃, the intrinsic viscosity of the PBT melt is 1.10-1.25 dL/g, the temperature of the spinning beam II is 260-265 ℃, and the temperature of the spinning beam III is 274-277 ℃.
7. The method for preparing the side-by-side self-crimping POY-DT silk elastic fiber according to claim 6, wherein the parameters of the POY-DT process are as follows: the cooling temperature is 23-25 ℃, the winding speed is 2800-3100 m/min, the setting temperature is 130-140 ℃, the stretching temperature is 85-95 ℃, and the stretching ratio is 1.4-1.8; the temperature of the relaxation heat treatment is 90-120 ℃, and the time is 20-30 min.
8. The parallel self-crimping POY-DT elastic fiber prepared by the method for preparing the parallel self-crimping POY-DT elastic fiber according to any one of claims 1 to 7, which is characterized in that: the single-fiber composite fiber bundle comprises a plurality of PBT/PET parallel composite monofilaments, wherein in the same fiber bundle, the mass ratio of PBT to PET in one part of the PBT/PET parallel composite monofilaments is 9: 5-7: 3, and the mass ratio of PBT to PET in the other part of the PBT/PET parallel composite monofilaments is 5: 9-3: 7; the single-filament curling directions of the parallel self-curling POY-DT elastic fibers are randomly distributed.
9. The parallel self-crimping POY-DT elastic fiber according to claim 8, wherein the parallel self-crimping POY-DT elastic fiber has a crimp shrinkage of 66-70%, a crimp stability of 92.3-94.5%, a shrinkage elongation of 110-115%, and a crimp elastic recovery of 80-85%.
10. The POY-DT silk elastic fiber according to claim 8, wherein the breaking strength of the POY-DT silk elastic fiber is not less than 2.8cN/dtex, the elongation at break is 50.0 ± 5.0%, and the total fineness is 80-150 dtex.
CN201911350195.1A 2019-12-24 2019-12-24 Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof Pending CN111005083A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911350195.1A CN111005083A (en) 2019-12-24 2019-12-24 Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911350195.1A CN111005083A (en) 2019-12-24 2019-12-24 Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof

Publications (1)

Publication Number Publication Date
CN111005083A true CN111005083A (en) 2020-04-14

Family

ID=70116020

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911350195.1A Pending CN111005083A (en) 2019-12-24 2019-12-24 Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof

Country Status (1)

Country Link
CN (1) CN111005083A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02221414A (en) * 1989-02-23 1990-09-04 Mitsubishi Rayon Co Ltd Conjugated fiber yarn
JP2001234425A (en) * 2000-02-24 2001-08-31 Teijin Ltd Conjugate spinning method and conjugate spinneret
CN1737224A (en) * 2004-08-17 2006-02-22 株式会社化纤喷丝板制作所 Spinning spinneret and method for producing side-by-side-type conjugated fibre
CN1962968A (en) * 2006-11-17 2007-05-16 东华大学 Method for preparing PBT/PET 3-D crimped fiber and use thereof
CN101245518A (en) * 2008-02-18 2008-08-20 东华大学 Post-processing method for bi-component parallelly-arranged multiplex yarns
CN101851812A (en) * 2009-12-18 2010-10-06 东丽纤维研究所（中国）有限公司 Parallel composite elastic fiber and manufacture method thereof
CN104342802A (en) * 2013-07-25 2015-02-11 东丽纤维研究所（中国）有限公司 Double-component composite elastic fiber
CN105603597A (en) * 2014-11-24 2016-05-25 东丽纤维研究所（中国）有限公司 Two-component multifilament

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02221414A (en) * 1989-02-23 1990-09-04 Mitsubishi Rayon Co Ltd Conjugated fiber yarn
JP2001234425A (en) * 2000-02-24 2001-08-31 Teijin Ltd Conjugate spinning method and conjugate spinneret
CN1737224A (en) * 2004-08-17 2006-02-22 株式会社化纤喷丝板制作所 Spinning spinneret and method for producing side-by-side-type conjugated fibre
CN1962968A (en) * 2006-11-17 2007-05-16 东华大学 Method for preparing PBT/PET 3-D crimped fiber and use thereof
CN101245518A (en) * 2008-02-18 2008-08-20 东华大学 Post-processing method for bi-component parallelly-arranged multiplex yarns
CN101851812A (en) * 2009-12-18 2010-10-06 东丽纤维研究所（中国）有限公司 Parallel composite elastic fiber and manufacture method thereof
CN104342802A (en) * 2013-07-25 2015-02-11 东丽纤维研究所（中国）有限公司 Double-component composite elastic fiber
CN105603597A (en) * 2014-11-24 2016-05-25 东丽纤维研究所（中国）有限公司 Two-component multifilament

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
罗锦: "PTT/PET并列复合纤维的自卷曲结构及其性能", 《工程科技 I辑》 *
钱东明: "20头PBT/PET复合纤维生产技术", 《聚酯工业》 *

Similar Documents

Publication Publication Date Title
CN110983465B (en) Method for preparing self-curling elastic combined filament yarn for knitting
CN111118628B (en) PBT/PET double-component elastic yarn and preparation method thereof
CN111101238B (en) Parallel self-crimping elastic fiber and preparation method thereof
JP7255028B2 (en) Bicomponent elastic yarn based on PET with different viscosities and its production method
CN111101210B (en) Natural crimped fiber and preparation method thereof
CN111118665B (en) Polyester-nylon composite yarn and preparation method thereof
CN111101235B (en) CDP/PET double-component composite filament by one-step method and preparation method thereof
CN111101237B (en) High-low viscosity PET parallel composite self-crimping fiber and preparation method thereof
CN111005083A (en) Parallel self-crimping POY-DT silk elastic fiber and preparation method thereof
CN110983466B (en) PTT/PET double-component elastic yarn and preparation method thereof
CN111118663B (en) PBT/PTT double-component elastic yarn and preparation method thereof
CN111118630B (en) Soft polyester fiber and preparation method thereof
CN111118664B (en) Parallel self-curling wool-like elastic fiber and preparation method thereof
CN111058108B (en) Self-curling elastic combined filament yarn for knitting and preparation method thereof
CN111041577B (en) PET/modified PET double-component elastic yarn and preparation method thereof
CN111101236B (en) Self-curling elastic combined filament yarn for knitted denim and preparation method thereof
KR20070047088A (en) Method for preparing polyester conjugated fiber having latent crimping characteristics and the conjugated fiber prepared thereby

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination