WO2021128750A1 - 一步法cdp/pet双组份复合丝及其制备方法 - Google Patents

一步法cdp/pet双组份复合丝及其制备方法 Download PDF

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Publication number
WO2021128750A1
WO2021128750A1 PCT/CN2020/095362 CN2020095362W WO2021128750A1 WO 2021128750 A1 WO2021128750 A1 WO 2021128750A1 CN 2020095362 W CN2020095362 W CN 2020095362W WO 2021128750 A1 WO2021128750 A1 WO 2021128750A1
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Prior art keywords
cdp
pet
hole
distribution hole
melt
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PCT/CN2020/095362
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English (en)
French (fr)
Inventor
王山水
范红卫
汤方明
张元华
王丽丽
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江苏恒力化纤股份有限公司
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Priority to KR1020217039345A priority Critical patent/KR102482996B1/ko
Priority to JP2022535862A priority patent/JP7255029B2/ja
Publication of WO2021128750A1 publication Critical patent/WO2021128750A1/zh

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • 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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/02—Heat treatment
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • 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
    • D01D5/28—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
    • 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
    • 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
    • D10B2401/14—Dyeability

Definitions

  • the invention belongs to the technical field of polyester fibers, and relates to a one-step CDP/PET two-component composite yarn and a preparation method thereof.
  • Composite fiber is a combination of two or more fiber-forming polymer melts or solutions, using their different varieties, viscosity, or proportions, through their respective melt or solution pipelines, and then combined by multiple distribution plates.
  • the resulting composite components are distributed and merged in various ways when they reach the spinneret to form a composite melt (solution) stream, and finally ejected from the same spinneret hole to become a fiber.
  • composite spinning technology plays an important role in the development of new varieties of synthetic fibers with "natural appearance" and "high added value”.
  • CDP/PET composite fiber belongs to the compound of the same kind of fiber-forming polymers with different properties.
  • the two components have relatively similar physical properties and better compatibility.
  • the two phases are not easy to peel off, so the two polymers are It has good adhesion after fiber.
  • CDP/PET composite fiber has good dyeing properties, stretch elasticity and mechanical properties, and has a very broad application prospect in the field of apparel fabrics.
  • CDP/PET fiber when CDP/PET fiber is used in the knitting field, there is a very difficult problem: the surface of woven knitted fabrics will appear random "striated unevenness", especially on plain knitted fabrics, resulting in many kinds of knitting. The product cannot be promoted and applied. This problem has become a major obstacle restricting the development and application of CDP/PET fiber knitted fabrics.
  • the present invention provides a one-step CDP/PET two-component composite yarn and a preparation method thereof, and aims to solve the problem of random "striated unevenness" when the CDP/PET side-by-side composite fiber is applied to knitted fabrics in the prior art. problem.
  • the present invention adopts a CDP/PET side-by-side composite monofilament with a mass ratio of CDP to PET of 3:1 to 5:1 in a bundle of filaments and a CDP/PET side-by-side composite monofilament with a mass ratio of CDP to PET of 1:3 to 1:5
  • the coexistence of composite monofilaments because the two CDP/PET side-by-side composite fibers with different mass ratios of CDP and PET have different shrinkage methods and shapes, breaking a bundle of CDP/PET side-by-side composite fibers to form a neat left and right spiral shape , And then solve the problem of "striated unevenness" in knitted fabrics made of CDP/PET side-by-side composite fibers.
  • the preparation method of one-step CDP/PET two-component composite yarn According to the FDY process, after the CDP melt and the PET melt are distributed, they are extruded from the spinneret hole m and the spinneret hole n on the same spinneret to produce FDY After the silk is subjected to relaxation heat treatment, one-step CDP/PET two-component composite silk is obtained;
  • the spinneret hole n To the spinneret hole n;
  • the difference between the apparent viscosity of PET melt and CDP melt does not exceed 5% (the apparent viscosity is determined by simulation, and the flow It is obtained by measuring the apparent viscosity of the polymer melt at a specific temperature by a variable instrument);
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.30-1.50:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole The ratio of the diameter of D is 1: 1.30 to 1.50.
  • the CDP melt is distributed through the distribution holes A and C
  • 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 difference between the apparent viscosity of PET melt and CDP melt is no more than 5%.
  • Each distribution hole is a cylindrical hole of equal height.
  • the ratio of the diameter of the distribution hole A to the distribution hole B is not equal to the diameter of the distribution hole C and the distribution hole D.
  • the ratio of the method makes the mass ratio of the CDP melt to the PET melt distributed into the spinneret hole m and the mass ratio of the CDP melt to the PET melt distributed into the spinneret hole n different, realizing a bundle of CDP Two different mass ratios of CDP and PET coexist in the /PET side-by-side composite fiber to ensure the different crimp shapes.
  • the number and position relationship of the distribution holes and guide holes are set reasonably to ensure the smooth progress of the distribution;
  • the invention distributes the spinneret holes m and the spinneret holes n according to concentric circles, and controls the spinneret holes on the same circle to be m or all n, ensuring that the mass ratio of a part of CDP to PET is 3:1 ⁇ 5: 1 CDP/PET side-by-side composite monofilament can be mixed into the middle of another part of CDP/PET side-by-side composite monofilament with a mass ratio of CDP to PET of 1:3 ⁇ 1:5, which can break the neat left and right spiral morphology.
  • the present invention sets the temperature of the spinning box I, the spinning box II and the spinning box III to make it compatible with the intrinsic viscosity of the PET melt (0.55 ⁇ 0.60dL/g) and the characteristics of the CDP melt
  • the viscosity (0.70 ⁇ 0.75dL/g) cooperates with each other to ensure that the apparent viscosity of the PET component extruded from the spinneret and the CDP component is close, which not only controls the mass ratio of the parallel composite monofilament, but also guarantees
  • the spinning process can be carried out smoothly; the present invention does not need to adjust the shape of the spinneret hole, and the commonly used parallel composite spinneret hole can be selected; the present invention selects the FDY spinning process and sets the spinning process parameters reasonably.
  • the obtained fiber has good crimping performance, excellent elasticity and good overall performance.
  • the existing CDP/PET side-by-side composite fibers have the same torsional stress due to spiral crimping, which makes the fibers on some yarn sections produce a neat spiral crimped surface morphology structure.
  • Each crimped yarn section of CDP/PET fiber is different in fiber tilt state and mechanical response behavior, when using two-component CDP/PET fiber to weave fabric, it will cause the difference of yarn reflection effect and uneven tension, which will be randomly formed on the cloth surface. Protrusions or depressions, you will find "uneven horizontal stripes” with random changes in light and dark, that is, the so-called “uneven stripes”.
  • the spinning melt is constantly flowing.
  • the calculation formula of the melt flow rate according to the melt flowing in the tube is:
  • ⁇ Q is the melt flow rate
  • d is the diameter of the tube
  • ⁇ is the apparent viscosity of the melt at the entrance of the tube
  • l is the length of the tube
  • ⁇ P is the pressure drop after the melt passes through the tube. It can be seen that when ⁇ P, ⁇ , and l remain equal, the ratio of the melt flow in the two circular tubes is close to the ratio of the fourth power of the diameter of the circular tube;
  • the invention is based on the FDY process, after the CDP melt and the PET melt are distributed, the side-by-side self-crimped elastic fiber is extruded from the spinneret hole m and the spinneret hole n on the same spinneret.
  • the CDP melt is distributed through the distribution hole A, while the PET melt is distributed into the spinneret hole m through the distribution hole B, the CDP melt is distributed through the distribution hole C, and the PET melt is distributed into the spinneret n through the distribution hole D. ;
  • ⁇ Q1, d1, ⁇ 1, l1, and ⁇ P1 correspond to distribution hole A (or C)
  • ⁇ Q2, d2, ⁇ 2, l2, and ⁇ P2 correspond to distribution hole B (or D)
  • the intrinsic viscosity, the temperature of the spinning box I, the temperature of the spinning box II, and the temperature of the spinning box III are coordinated with each other.
  • the appearance of the PET melt and the CDP melt at the entrance of the distribution hole A and the distribution hole B The viscosity is close to the same (the difference is less than 5%), the apparent viscosity of the PET melt and the CDP melt at the entrance of the distribution hole C and the distribution hole D are close to the same (the difference is less than 5%), so ⁇ 1 and ⁇ 2 are approximately equal;
  • the apparent viscosity of PET melt and CDP melt does not differ by more than 5%, and distribution hole A, distribution hole B, distribution hole C and distribution hole D are all set on the distribution plate and their size is small.
  • the pressure drop of the CDP melt after passing through the distribution hole A is basically the same as the pressure drop of the PET melt after passing through the distribution hole B.
  • the pressure of the CDP melt after passing through the distribution hole C The pressure drop is basically the same as the pressure drop of the PET melt after passing through the distribution hole D, so ⁇ P1 and ⁇ P2 are approximately equal; because the distribution hole A and the distribution hole B are equal in height, and the distribution hole C and the distribution hole D are equal in height, so l1 and l2 are equal;
  • the ratio of the diameter of the distribution hole A to the distribution hole B is 1.30-1.50:1
  • the ratio of the CDP melt flow through the distribution hole A to the PET melt flow through the distribution hole B is about 3: 1 ⁇ 5:1
  • the mass ratio of CDP to PET in the monofilament finally extruded from the spinneret hole m is 3:1 ⁇ 5:1.
  • the ratio of the diameter of the distribution hole C to the distribution hole D is 1.
  • the ratio of the CDP melt flowing through the distribution hole C to the PET melt flowing through the distribution hole D is about 1:3 ⁇ 1:5, and finally the monofilament extruded from the spinneret hole n
  • the mass ratio of CDP to PET is 1:3 ⁇ 1:5;
  • the thermal shrinkage rates of CDP and PET used in the present invention are different. Further, by mixing CDP and PET, the two polymers with different thermal shrinkage rates are compatible, and the existence of compatibility allows the polymer to pass The same spinneret hole (that is, the two fiber-forming polymer melts are distributed together according to the parallel composite spinning method and then extruded) can be bonded together. This bonding effect is combined with the different heat shrinkage rates to make the The two polymer fibers (ie CDP/PET side-by-side composite monofilament) from the same spinneret can form a self-crimped form after relaxation heat treatment, thus having elasticity.
  • This self-crimping form is specifically: the CDP component in the spiral On the inner side of the crimp, the PET component is on the outer side of the spiral crimp (as can be seen from the rigidity and flexibility of the CDP and PET molecules, the shrinkage rate of CDP is relatively large, while the shrinkage rate of PET is relatively small, so the CDP component in the composite fiber On the inner side of the, the PET component is on the outer side of the spiral coil);
  • the mass ratio of CDP to PET in a part of CDP/PET side-by-side composite monofilament is 3:1 ⁇ 5:1
  • the mass ratio of CDP to PET in the other part of CDP/PET side-by-side composite monofilament is 1:3 ⁇ 1:5, so there is a certain difference in the crimp shape of different monofilaments.
  • This difference plays a role in breaking the pure CDP/PET side-by-side composite yarn to form a neat left and right spiral morphology, making the obtained side-by-side two-component
  • the crimping direction of the monofilament is randomly distributed, so the surface of the knitted fabric woven from the two-component composite yarn will not appear random "striated unevenness”.
  • the mass ratio of the PET melt to the CDP melt is 50:50.
  • the spinneret hole m or the spinneret hole n is circular, elliptical or "8"-shaped spinneret holes.
  • CDP/PET two-component composite yarn In the one-step preparation method of CDP/PET two-component composite yarn as described above, all the spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n, so as to ensure the quality of CDP and PET
  • the CDP/PET side-by-side composite monofilament with a ratio of 3:1 ⁇ 5:1 can be mixed into the middle of the PTT/PET side-by-side composite monofilament with a mass ratio of CDP and PET of 1:3 ⁇ 1:5, which can break and form a neat left , The role of the right spiral shape.
  • the spinneret hole m is composed of the sequentially connected guide hole E, transition hole and capillary micropores
  • the spinneret hole n is composed of the sequentially connected guide hole F, Transition holes and capillary micro holes are formed.
  • the guide hole E is connected to the distribution hole A and the distribution hole B at the same time, and the guide hole F is connected to 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 is located on the distribution plate in the spinning box III, the PET melt is transported to the distribution hole B and the distribution hole D through the spinning box I, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II .
  • the intrinsic viscosity of the PET melt is 0.55 ⁇ 0.60dL/g
  • the temperature of the spinning box I is 280 ⁇ 285°C
  • the characteristics of the CDP melt The viscosity is 0.70-0.75 dL/g
  • the temperature of the spinning box II is 275-280°C
  • the temperature of the spinning box III (the temperature of the spinning box III is the spinning temperature) is 278-282°C.
  • the above-mentioned one-step preparation method of CDP/PET two-component composite yarn the parameters of FDY process are: cooling temperature 23 ⁇ 25°C, network pressure 0.20 ⁇ 0.30MPa, one roll speed 2400 ⁇ 2500m/min, one roll temperature 90 ⁇ 95°C, two roll speed 4000 ⁇ 4200m/min, two roll temperature 160 ⁇ 180°C, winding speed 3930 ⁇ 4120m/min; relaxation heat treatment temperature is 90 ⁇ 120°C, time is 20 ⁇ 30min.
  • the present invention also provides a one-step CDP/PET two-component composite yarn prepared by the one-step method for preparing CDP/PET two-component composite yarn as described above, which is composed of multiple PET/CDP parallel composite monofilaments
  • the mass ratio of CDP to PET in a part of PET/CDP side-by-side composite monofilament is 3:1 ⁇ 5:1
  • the mass ratio of CDP to PET in the other part of PET/CDP side-by-side composite monofilament is 1:3 ⁇ 1:5
  • the crimping direction of the monofilament in the one-step CDP/PET two-component composite yarn is randomly distributed.
  • the one-step CDP/PET two-component composite yarn as described above, the one-step CDP/PET two-component composite yarn has a crimp shrinkage rate of 48-53%, a crimp stability of 80-83%, and a shrinkage elongation rate of 90 ⁇ 93%, and the recovery rate of crimp elasticity is 88 ⁇ 92%.
  • the above-mentioned one-step CDP/PET two-component composite yarn has a breaking strength of 2.7 ⁇ 3.0cN/dtex, a breaking elongation of 40.0 ⁇ 4.0%, and a total fineness of 100 ⁇ 200dtex.
  • the above-prepared one-step CDP/PET two-component composite yarn is made into a knitted fabric to test the unevenness of the stripe.
  • the test process is: first collect the knitted fabric image and convert it into a gray-scale image, and then adjust the gray Calculate the parameter D after the first processing and the second processing of the degree image, and use the parameter D to characterize the degree of unevenness of the stripe.
  • D value ⁇ 3% can be judged as "striated unevenness”
  • D value ⁇ 10% can be judged as severe "striated unevenness”.
  • the test results of the knitted fabric made of the one-step CDP/PET two-component composite yarn of the present invention are: the D value of the knitted fabric made of the one-step CDP/PET two-component composite yarn is ⁇ 1.0%; this shows the present invention
  • the prepared one-step CDP/PET two-component composite yarn does not have the problem of "uneven strips”.
  • the one-step method for preparing CDP/PET two-component composite yarn of the present invention uses distribution holes with different diameters to make the obtained side-by-side composite fibers contain different component ratios, thereby avoiding the fibers from being neat and spiral.
  • the morphological structure of the curled surface will be produced without "striated unevenness";
  • the CDP/PET two-component composite yarn prepared by the one-step CDP/PET two-component composite yarn of the present invention has better dyeing performance, better crimping performance, good elasticity, and excellent comprehensive performance. The scope is wider.
  • Figure 1 is a schematic diagram of the melt distribution of the present invention; wherein, A, B, C, and D are independent distribution holes, and E and F are independent guide holes.
  • the crimp shrinkage rate and crimp stability of the present invention are obtained by testing the tow using GB6506-2001 "Test Method for Crimp Performance of Synthetic Fiber Textured Yarn";
  • the shrinkage elongation (reflecting the elasticity and crimp degree of the deformed yarn, the fiber first bears a light load and then a heavy load, calculates the ratio of the length difference under the two loads to the crimp length) and the crimp elastic recovery rate test methods are as follows:
  • CE (l 2 -l 1 )/l 1 ;
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the CDP melt (intrinsic viscosity of 0.73dL/g) and PET melt (intrinsic viscosity of 0.56dL/g) with a mass ratio of 50:50 are distributed from the same spinneret FDY filament is extruded from the spinning hole m (round) and the spinning hole n (round);
  • the distribution refers to distributing the CDP melt through the distributing hole A, and at the same time distributing the PET melt through the distributing hole B into the spinneret hole m, and the CDP melt through the distributing hole C, and at the same time The PET melt is distributed into the spinneret hole n through the distribution hole D;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.5:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.5;
  • the spinneret hole m is composed of a guide hole E, transition hole and capillary micropores connected in sequence
  • the spinneret hole n is composed of a guide hole F, transition hole and capillary micropores connected in sequence.
  • the guide hole E is at the same time as the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the silk box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 282°C, and the temperature of the spinning box II The temperature is 279°C, and the temperature of the spinning box III is 280°C;
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 25°C, network pressure 0.3MPa, one roll speed 2430m/min, one roll temperature 94°C, two roll speed 4000m/min, two roll temperature 164°C, winding speed 3930m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage rate of the component composite yarn is 52%, the crimp stability is 80%, the shrinkage elongation rate is 91%, and the crimp elastic recovery rate is 92%;
  • the breaking strength of the one-step CDP/PET two-component composite yarn It is 2.7 cN/dtex, the elongation at break is 44%, and the total fineness is 108 dtex.
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the distribution refers to distributing the CDP melt through the distributing hole A, while distributing the PET melt through the distributing hole B into the spinneret hole m, the CDP melt through the distributing hole C, and the PET melt through the distributing hole at the same time.
  • D is allocated to the spinneret hole n;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.3:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.3;
  • the spinneret hole m is composed of a guide hole E, transition hole and capillary micropores connected in sequence
  • the spinneret hole n is composed of a guide hole F, transition hole and capillary micropores connected in sequence.
  • the guide hole E is at the same time as the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the filament box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 285 °C, and the temperature of the spinning box II The temperature is 279°C, and the temperature of the spinning box III is 282°C;
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 25°C, network pressure 0.3MPa, one roll speed 2500m/min, one roll temperature 95°C, two roll speed 4140m/min, two roll temperature 176°C, winding speed 4070m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage rate of the component composite yarn is 50%, the crimp stability is 82%, the shrinkage elongation rate is 90%, and the crimp elastic recovery rate is 90%;
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the distribution refers to distributing the CDP melt through the distributing hole A, while distributing the PET melt through the distributing hole B into the spinneret hole m, the CDP melt through the distributing hole C, and the PET melt through the distributing hole at the same time.
  • D is allocated to the spinneret hole n;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.4:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.4;
  • the spinneret hole m is composed of a guide hole E, transition hole and capillary micropores connected in sequence
  • the spinneret hole n is composed of a guide hole F, transition hole and capillary micropores connected in sequence.
  • the guide hole E is at the same time as the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the silk box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 283°C, and the temperature of the spinning box II The temperature is 280°C, and the temperature of the spinning box III is 281°C;
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 23°C, network pressure 0.2MPa, one roll speed 2480m/min, one roll temperature 92°C, two roll speed 4170m/min, two roll temperature 180°C, winding speed 4100m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage rate of the component composite yarn is 53%, the crimp stability is 80%, the shrinkage elongation ratio is 92%, and the crimp elastic recovery rate is 92%;
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the distribution means that the CDP melt is distributed through the distribution hole A, while the PET melt is distributed into the spinneret hole m through the distribution hole B, the CDP melt is distributed through the distribution hole C, and the PET melt is simultaneously distributed through the distribution hole.
  • D is allocated to the spinneret hole n;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.4:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.4;
  • the spinneret hole m is composed of a guide hole E, transition hole and capillary micropores connected in sequence
  • the spinneret hole n is composed of a guide hole F, transition hole and capillary micropores connected in sequence.
  • the guide hole E is at the same time as the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the silk box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 283°C, and the temperature of the spinning box II The temperature is 275°C, and the temperature of the spinning box III is 282°C;
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 24°C, network pressure 0.3MPa, one roll speed 2400m/min, one roll temperature 90°C, two roll speed 4100m/min, two roll temperature 160°C, winding speed 4030m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage rate of the component composite yarn is 49%, the crimp stability is 80%, the shrinkage elongation rate is 92%, and the crimp elastic recovery rate is 89%;
  • the breaking strength of the one-step CDP/PET two-component composite yarn It is 2.7 cN/dtex, the elongation at break is 39%, and the total fineness is 108 dtex.
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the CDP melt (intrinsic viscosity of 0.72dL/g) and PET melt (intrinsic viscosity of 0.6dL/g) with a mass ratio of 50:50 are distributed from the same spinneret FDY filament is extruded from the spinning hole m (round) and the spinning hole n (round);
  • the distribution refers to distributing the CDP melt through the distributing hole A, while distributing the PET melt through the distributing hole B into the spinneret hole m, the CDP melt through the distributing hole C, and the PET melt through the distributing hole at the same time.
  • D is allocated to the spinneret hole n;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.5:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.5;
  • the spinneret hole m is composed of a guide hole E, transition hole and capillary micropores connected in sequence
  • the spinneret hole n is composed of a guide hole F, transition hole and capillary micropores connected in sequence.
  • the guide hole E is at the same time as the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the silk box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 283°C, and the temperature of the spinning box II The temperature is 277°C, and the temperature of the spinning box III is 278°C;
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 25°C, network pressure 0.2MPa, one roll speed 2490m/min, one roll temperature 91°C, two roll speed 4190m/min, two roll temperature 168°C, winding speed 4120m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage rate of the component composite yarn is 48%, the crimp stability is 80%, the shrinkage elongation rate is 93%, and the crimp elastic recovery rate is 88%;
  • the breaking strength of the one-step CDP/PET two-component composite yarn It is 2.7 cN/dtex, the elongation at break is 39%, and the total fineness is 100 dtex.
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the distribution means that the CDP melt is distributed through the distribution hole A, while the PET melt is distributed into the spinneret hole m through the distribution hole B, the CDP melt is distributed through the distribution hole C, and the PET melt is simultaneously distributed through the distribution hole.
  • D is allocated to the spinneret hole n;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.3:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.3;
  • the spinneret hole m is composed of a guide hole E, transition hole and capillary micropores connected in sequence
  • the spinneret hole n is composed of a guide hole F, transition hole and capillary micropores connected in sequence.
  • the guide hole E is at the same time as the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the silk box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 283°C, and the temperature of the spinning box II The temperature is 277°C, and the temperature of the spinning box III is 281°C;
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 25°C, network pressure 0.2MPa, one roll speed 2440m/min, one roll temperature 93°C, two roll speed 4150m/min, two roll temperature 176°C, winding speed 4080m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage rate of the component composite yarn is 50%, the crimp stability is 81%, the shrinkage elongation rate is 93%, and the crimp elastic recovery rate is 90%;
  • the breaking strength of the one-step CDP/PET two-component composite yarn It is 2.9 cN/dtex, the elongation at break is 38%, and the total fineness is 132 dtex.
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the CDP melt (intrinsic viscosity of 0.7dL/g) and PET melt (intrinsic viscosity of 0.58dL/g) with a mass ratio of 50:50 are distributed from the same spinneret FDY filament is extruded from the spinneret hole m (ellipse) and spinneret hole n (round);
  • the distribution means that the CDP melt is distributed through the distribution hole A, while the PET melt is distributed into the spinneret hole m through the distribution hole B, the CDP melt is distributed through the distribution hole C, and the PET melt is simultaneously distributed through the distribution hole.
  • D is allocated to the spinneret hole n;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.3:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.3;
  • the spinneret hole m is composed of sequentially connected guide holes E, transition holes and capillary micropores.
  • the spinneret hole n is composed of sequentially connected guide holes F, transition holes and capillary micropores.
  • the guide hole E is simultaneously with the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the filament box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 283°C, and the temperature of the spinning box II The temperature is 276°C, and the temperature of the spinning box III is 282°C;
  • the apparent viscosity difference of PET melt and CDP melt is 4.5%
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 25°C, network pressure 0.3MPa, one roll speed 2450m/min, one roll temperature 93°C, two roll speed 4180m/min, two roll temperature 173°C, winding speed 4110m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage rate of the component composite yarn is 48%, the crimp stability is 82%, the shrinkage elongation ratio is 92%, and the crimp elastic recovery rate is 88%;
  • the breaking strength of the one-step CDP/PET two-component composite yarn It is 2.9 cN/dtex, the elongation at break is 38%, and the total fineness is 160 dtex.
  • the preparation method of one-step CDP/PET two-component composite yarn is as follows:
  • the distribution means that the CDP melt is distributed through the distribution hole A, while the PET melt is distributed into the spinneret hole m through the distribution hole B, the CDP melt is distributed through the distribution hole C, and the PET melt is simultaneously distributed through the distribution hole.
  • D is allocated to the spinneret hole n;
  • Distribution hole A and distribution hole B are equal-height cylindrical holes, the ratio of the diameter of the distribution hole A to the distribution hole B is 1.4:1, the distribution hole C and the distribution hole D are equal-height cylindrical holes, the distribution hole C and the distribution hole D The ratio of diameter is 1:1.4;
  • the spinneret hole m is composed of a guide hole E, transition hole and capillary micropores connected in sequence
  • the spinneret hole n is composed of a guide hole F, transition hole and capillary micropores connected in sequence.
  • the guide hole E is at the same time as the distribution hole A and the distribution hole.
  • the hole B is connected, and the guide hole F is connected to 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 box III, and the PET melt is spun
  • the filament box I is transported to the distribution hole B and the distribution hole D, and the CDP melt is transported to the distribution hole A and the distribution hole C through the spinning box II; the temperature of the spinning box I is 280 °C, and the temperature of the spinning box II is The temperature is 275°C, and the temperature of the spinning box III is 278°C;
  • spinneret holes are distributed in concentric circles, and the spinneret holes on the same circle are all m or all n;
  • the parameters of FDY process are: cooling temperature 23°C, network pressure 0.3MPa, one roll speed 2410m/min, one roll temperature 91°C, two roll speed 4200m/min, two roll temperature 170°C, winding speed 4120m/min;
  • the prepared one-step CDP/PET two-component composite yarn is composed of multiple PET/CDP side-by-side composite monofilaments, and the monofilament crimping direction is randomly distributed in the one-step CDP/PET two-component composite yarn; the one-step CDP/PET double
  • the crimp shrinkage of the component composite yarn is 50%, the crimp stability is 83%, the shrinkage elongation is 91%, and the crimp elastic recovery rate is 90%;
  • the breaking strength of the one-step CDP/PET two-component composite yarn It is 3 cN/dtex, the elongation at break is 36%, and the total fineness is 200 dtex.

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Abstract

一种一步法CDP/PET双组份复合丝及其制备方法，按FDY工艺，将CDP和PET熔体分配后，从同一喷丝板上的喷丝孔m与n挤出制成FDY丝后进行松弛热处理制得；其中CDP和PET熔体经分配孔A、B流至喷丝孔m，经分配孔C、D流至喷丝孔n，在分配孔A、B、C、D的入口处，CDP熔体和PET熔体的表观粘度相差不超过5％，分配孔A、B为等高圆柱孔，且直径之比为1.30～1.50:1，分配孔C、D为等高圆柱孔，且直径之比为1:1.30～1.50；制得的复合丝由多根不同配比的CDP/PET并列复合单丝组成，复合丝中单丝卷曲方向随机分布，该双组份复合丝的针织物不存在条阴状不匀的问题。

Description

一步法CDP/PET双组份复合丝及其制备方法 技术领域
本发明属于聚酯纤维技术领域，涉及一步法CDP/PET双组份复合丝及其制备方法。
背景技术
随着合成纤维应用范围的不断扩大和纺丝技术的发展，各种具有高附加价值的差别化纤维，即所谓第二代合成纤维在近20年来，不断地得到开发与应用，其中复合纺丝技术尤为突出。复合纤维是将两种或两种以上的成纤高聚物熔体或溶液，利用其品种、粘度或配比的不同，分别通过各自的熔体或溶液管道，在由多块分配板组合而成的复合组件内进行分配，到达喷丝板时以各种方式汇合，形成复合熔体(溶液)流，最后从同一喷丝孔中喷出而成为一根纤维。复合纺丝技术作为对纤维进行物理改性的一种重要技术手段，在开发具有“天然外观”和“高附加值”的合成纤维新品种方面，发挥着重要作用。
CDP/PET复合纤维，属于性能不同的成纤高聚物的同类物间的复合，两组分有着较为相近的物性和较好的相容性，两相间不易产生剥离，故两种聚合物成纤后具有很好的粘附力。CDP/PET复合纤维具有较好的染色性能、伸缩弹性和力学性能，在服装面料领域具有十分广阔的应用前景。
但是CDP/PET纤维应用于针织领域时，出现了非常棘手的问题：织造的针织物表面会出现随机性的“条阴状不匀”，尤其在平纹针织物上更为明显，导致很多种针织产品无法推广应用，这一问题成为制约CDP/PET纤维针织物开发应用的一大阻碍。
因此，研究一种避免随机性的“条阴状不匀”出现的CDP/PET并列型双组份纤维及其制备方法具有十分重要的意义。
发明内容
本发明提供一步法CDP/PET双组份复合丝及其制备方法，目的是解决现有技术中CDP/PET并列型复合纤维应用于针织物产品时出现随机性的“条阴状不匀”的问题。本发明采用使一束丝中CDP与PET的质量比为3:1～5:1的CDP/PET并列复合单丝与CDP与PET的质量比为1:3～1:5的CDP/PET并列复合单丝共存的方式，由于两种CDP与PET的质量比不同的CDP/PET并列复合纤维的收缩的方式和形态不同，打破了一束CDP/PET并列复合纤维形成整齐的左、右螺旋形态，进而解决了由CDP/PET并列复合纤维制得的针织物存在的“条阴状不匀”的问题。
为达到上述目的，本发明采用的技术方案如下：
一步法CDP/PET双组份复合丝的制备方法，按FDY工艺，将CDP熔体和PET熔体分配后，从同一喷丝板上的喷丝孔m与喷丝孔n挤出制成FDY丝后进行松弛热处理，即得一步法CDP/PET双组份复合丝；
所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差不超过5％(表观粘度是通过模拟确定的，具体是采用流变仪测量聚合物熔体在特定温度下的表观粘度得到的)；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.30～1.50:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.30～1.50。
具体地，本发明采用将CDP熔体经分配孔A和C、将PET熔体经分配孔B和D进行分配，且设置在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差不超过5％，各分配孔为等高圆柱孔，分配孔A与分配孔B的直径之比不等于分配孔C与分配孔D的直径之比的方式，使得分配至喷丝孔m中的CDP熔体与PET熔体的质量比和分配至喷丝孔n中的CDP熔体与PET熔体的质量比不同，实现了一束CDP/PET并列复合纤维中共存两种不同的CDP与PET的质量比，保证了卷曲形态的不同，相应地，合理设置了分配孔和导孔的数量和位置关系，以保证分配的顺利进行；本发明将喷丝孔m和喷丝孔n按同心圆进行分布，并控制同一圆上的喷丝孔都为m或者都为n，保证了一部分CDP与PET的质量比为3:1～5:1的CDP/PET并列复合单丝可以混入另一部分CDP与PET的质量比为1:3～1:5的CDP/PET并列复合单丝中间，起到打破形成整齐的左、右螺旋形态的作用；本发明通过合理设置纺丝箱体I、纺丝箱体II与纺丝箱体III的温度，使其能够与PET熔体的特性粘度(0.55～0.60dL/g)和CDP熔体的特性粘度(0.70～0.75dL/g)相互配合，保证从喷丝孔挤出的PET组份和CDP组份的表观粘度较为接近，既起到了控制并列复合单丝的质量比的作用，也保证了纺丝的顺利进行；本发明无需对喷丝孔的形状进行调整，选用常用的并列型复合喷丝孔即可；本发明选用了FDY纺丝工艺，并通过合理设置纺丝工艺参数，制得的纤维的卷缩性能较好，弹性优良，综合性能较好。
本发明的原理如下：
现有CDP/PET并列复合纤维因螺旋卷曲产生的扭应力相同，使部分纱段上的纤维产生整齐螺旋状卷曲表面形态结构。CDP/PET纤维各卷曲纱段由于纤维倾斜状态和力学响应行为的不同，在使用双组份CDP/PET纤维编织织物时，会引起纱线反光效果以及张力不匀的差异，布面上随机形成凸起或凹陷，表观察看会发现明暗随机变化的“不均匀横纹”，即所谓的“条阴状不匀”。
在纺丝过程中，纺丝熔体是不断流动的，为了更好地控制熔体的流量，根据熔体在圆管内流动的熔体流量计算公式：
Figure PCTCN2020095362-appb-000001
式中，ΔQ为熔体流量，d为圆管直径，μ为圆管入口处熔体的表观粘度，l为圆管长度，ΔP为熔体经过圆管后的压力降，从式中可以看出，当ΔP、μ、l保持相等时，在两个圆管 内流动的熔体流量之比接近圆管直径的四次方之比；
本发明是按FDY工艺，将CDP熔体和PET熔体分配后，从同一喷丝板上的喷丝孔m与喷丝孔n挤出制得并列型自卷曲弹性纤维，其中分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
流经分配孔A(或C)的CDP熔体流量与流经分配孔B(或D)的PET熔体流量之比
Figure PCTCN2020095362-appb-000002
式中，ΔQ1、d1、μ1、l1、ΔP1对应分配孔A(或C)，ΔQ2、d2、μ2、l2、ΔP2对应分配孔B(或D)；由于CDP熔体的特性粘度、PET熔体的特性粘度、纺丝箱体I的温度、纺丝箱体II的温度、纺丝箱体III的温度相互配合，在分配孔A和分配孔B入口处PET熔体和CDP熔体的表观粘度接近一致(相差小于5％)，在分配孔C和分配孔D入口处PET熔体和CDP熔体的表观粘度接近一致(相差小于5％)，因此μ1与μ2近似相等；由于在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差不超过5％，且分配孔A、分配孔B、分配孔C和分配孔D都设置在分配板上，自身尺寸较小，因此CDP熔体经过分配孔A后的压力降与PET熔体经过分配孔B后的压力降基本相同，CDP熔体经过分配孔C后的压力降与PET熔体经过分配孔D后的压力降基本相同，因此ΔP1与ΔP2近似相等；由于分配孔A和分配孔B等高，分配孔C和分配孔D等高，因此l1与l2相等；
经计算可知，
Figure PCTCN2020095362-appb-000003
与
Figure PCTCN2020095362-appb-000004
近似相等，由于分配孔A与分配孔B的直径之比为1.30～1.50:1，因此流经分配孔A的CDP熔体流量与流经分配孔B的PET熔体流量之比约为3:1～5:1，最终从喷丝孔m挤出的单丝中CDP与PET的质量比为3:1～5:1，同理，由于分配孔C与分配孔D的直径之比为1:1.30～1.50，因此流经分配孔C的CDP熔体与流经分配孔D的PET熔体流量之比约为1:3～1:5，最终从喷丝孔n挤出的单丝中CDP与PET的质量比为1:3～1:5；
此外，本发明采用的CDP和PET的热收缩率不同，进一步地，通过将CDP和PET混合后，这两种热收缩率不同的聚合物具有相容性，相容性的存在使得聚合物通过同一个喷丝孔(即两种成纤聚合物熔体一起按照并列复合纺丝方式分配后挤出)时可以粘合在一起，这种粘合作用与不同的热收缩率作用一起，使得从同一个喷丝孔出来的两种聚合物纤维(即CDP/PET并列复合单丝)在经过松弛热处理后可以形成自卷曲形态，从而具有弹性，这种自卷曲形态具体为：CDP组份在螺旋卷曲的内侧，PET组份在螺旋卷曲的外侧(由CDP、PET分子的刚性和柔性特征可知，CDP的收缩率偏大，而PET的收缩率偏小，故复合纤维中CDP组份在螺旋卷曲的内侧，PET组份在螺旋卷曲的外侧)；
由于同一束纤维中，一部分CDP/PET并列复合单丝中CDP与PET的质量比为3:1～5:1，另一部分CDP/PET并列复合单丝中CDP与PET的质量比为1:3～1:5，因此不同单丝的卷曲形态存在一定的差异， 这种差异发挥了打破纯CDP/PET并列复合丝形成整齐的左、右螺旋形态的作用，使得制得的并列型双组份复合丝经松弛热处理后单丝卷曲方向随机分布，因而由该双组份复合丝织造的针织物表面不会出现随机性的“条阴状不匀”。
作为优选的技术方案：
如上所述的一步法CDP/PET双组份复合丝的制备方法，PET熔体与CDP熔体的质量之比为50:50。
如上所述的一步法CDP/PET双组份复合丝的制备方法，喷丝孔m或喷丝孔n为圆形、椭圆形或“8”字形喷丝孔。
如上所述的一步法CDP/PET双组份复合丝的制备方法，所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n，从而保证CDP与PET的质量比为3:1～5:1的CDP/PET并列复合单丝可以混入CDP与PET的质量比为1:3～1:5的PTT/PET并列复合单丝中间，起到打破形成整齐的左、右螺旋形态的作用。
如上所述的一步法CDP/PET双组份复合丝的制备方法，喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C。
如上所述的一步法CDP/PET双组份复合丝的制备方法，PET熔体的特性粘度为0.55～0.60dL/g，纺丝箱体I的温度为280～285℃，CDP熔体的特性粘度为0.70～0.75dL/g，纺丝箱体II的温度为275～280℃，纺丝箱体III的温度(纺丝箱体III的温度即为纺丝温度)为278～282℃。
如上所述的一步法CDP/PET双组份复合丝的制备方法，FDY工艺的参数为：冷却温度23～25℃，网络压力0.20～0.30MPa，一辊速度2400～2500m/min，一辊温度90～95℃，二辊速度4000～4200m/min，二辊温度160～180℃，卷绕速度3930～4120m/min；松弛热处理的温度为90～120℃，时间为20～30min。
本发明还提供采用如上任一项所述的一步法CDP/PET双组份复合丝的制备方法制得的一步法CDP/PET双组份复合丝，由多根PET/CDP并列复合单丝组成，同一束纤维中，一部分PET/CDP并列复合单丝中CDP与PET的质量比为3:1～5:1，另一部分PET/CDP并列复合单丝中CDP与PET的质量比为1:3～1:5；一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布。
作为优选的技术方案：
如上所述的一步法CDP/PET双组份复合丝，一步法CDP/PET双组份复合丝的卷曲收缩率为48～53％，卷曲稳定度为80～83％，紧缩伸长率为90～93％，卷缩弹性回复率为88～92％。
如上所述的一步法CDP/PET双组份复合丝，一步法CDP/PET双组份复合丝的断裂强度为 2.7～3.0cN/dtex，断裂伸长率为40.0±4.0％，总纤度为100～200dtex。
将上述制得的一步法CDP/PET双组份复合丝制成针织织物进行条阴状不匀情况测试，测试过程为：先采集该针织织物图像并将其转化为灰度图像，再对灰度图像进行第一次处理和第二次处理后计算参数D，以参数D表征条阴状不匀的程度，其中，灰度图像包括条阴区、非条阴区的高灰度值区域和非条阴区的低灰度值区域；第一次处理即将灰度图像中非条阴区的高灰度值区域的像素点变为纯白点；第二次处理即将灰度图像中非条阴区的低灰度值区域的像素点变为纯白点；参数D的计算公式为：D＝ΣB/A，其中，ΣB代表灰度图像中灰度值为0的像素点的个数，A代表灰度图像中像素点的总个数。
D值≥3％即可判定出现“条阴状不匀”，D值≥10％即可判定出现严重的“条阴状不匀”。本发明的一步法CDP/PET双组份复合丝制成的针织物测试得到的结果为：一步法CDP/PET双组份复合丝制成的针织物的D值≤1.0％；这说明本发明制得的一步法CDP/PET双组份复合丝不存在“条阴状不匀”的问题。
有益效果：
(1)本发明的一步法CDP/PET双组份复合丝的制备方法，通过采用不同直径的分配孔，使之得到的并列复合纤维中含有不同的组份比，从而避免了纤维整齐螺旋状卷曲表面形态结构的产生，不会出现“条阴状不匀”；
(2)本发明的一步法CDP/PET双组份复合丝的制备方法制得的CDP/PET双组份复合丝，染色性能较佳，卷缩性能较好，弹性良好，综合性能优异，应用范围较广。
附图说明
图1为本发明的熔体分配示意图；其中，A、B、C、D为相互独立的分配孔，E、F为相互独立的导孔。
具体实施方式
下面结合具体实施方式，进一步阐述本发明。应理解，这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。
本发明的卷曲收缩率和卷曲稳定度是采用GB6506-2001《合成纤维变形丝卷缩性能试验方法》对丝束进行测试得到的；
紧缩伸长率(反映变形丝的弹性和卷曲程度，纤维先承受轻负荷，再承受重负荷，计算两种负荷下的长度差值与卷曲长度的比值)和卷缩弹性回复率测试方法如下：
首先剪取长度约50cm的纤维试样两根，放入100℃热水中处理30min，取出后进行自然干燥，再截取约30cm长的试样，一端固定，一端加载0.0018cN/dtex的负荷，持续30s，在20cm处作标记，即为 试样的初始长度l 1；然后改为加载0.09cN/dtex的负荷，持续30s，测量标记点的位置，即为试样加重负荷时的长度l 2；最后去掉重负荷，试样无负荷回缩2min后再加0.0018cN/dtex的负荷，持续30s，测量标记点在标尺上的位置，即为回复长度l 3；紧缩伸长率(CE)和卷缩弹性回复率(SR)按下式计算：
CE＝(l 2-l 1)/l 1；
SR＝(l 2-l 3)/(l 2-l 1)。
实施例1
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.73dL/g)和PET熔体(特性粘度为0.56dL/g)分配后，从同一喷丝板上的喷丝孔m(圆形)与喷丝孔n(圆形)挤出制成FDY丝；
其中，如图1所示，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.5:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.5；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为282℃，纺丝箱体II的温度为279℃，纺丝箱体III的温度为280℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差5％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度25℃，网络压力0.3MPa，一辊速度2430m/min，一辊温度94℃，二辊速度4000m/min，二辊温度164℃，卷绕速度3930m/min；
(2)进行温度为97℃，时间为27min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为52％，卷曲稳定度为80％，紧缩伸长率为91％，卷缩弹性回复率为92％；该一步法CDP/PET双组份复合丝的断裂强度为2.7cN/dtex，断裂伸长率为44％，总纤度为108dtex。
实施例2
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.73dL/g)和PET熔体(特性 粘度为0.6dL/g)分配后，从同一喷丝板上的喷丝孔m(圆形)与喷丝孔n(圆形)挤出制成FDY丝；
其中，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.3:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.3；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为285℃，纺丝箱体II的温度为279℃，纺丝箱体III的温度为282℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差4.9％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度25℃，网络压力0.3MPa，一辊速度2500m/min，一辊温度95℃，二辊速度4140m/min，二辊温度176℃，卷绕速度4070m/min；
(2)进行温度为119℃，时间为21min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为50％，卷曲稳定度为82％，紧缩伸长率为90％，卷缩弹性回复率为90％；该一步法CDP/PET双组份复合丝的断裂强度为2.7cN/dtex，断裂伸长率为41％，总纤度为108dtex。
实施例3
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.75dL/g)和PET熔体(特性粘度为0.57dL/g)分配后，从同一喷丝板上的喷丝孔m(圆形)与喷丝孔n(圆形)挤出制成FDY丝；
其中，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.4:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.4；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送 至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为283℃，纺丝箱体II的温度为280℃，纺丝箱体III的温度为281℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差4.8％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度23℃，网络压力0.2MPa，一辊速度2480m/min，一辊温度92℃，二辊速度4170m/min，二辊温度180℃，卷绕速度4100m/min；
(2)进行温度为90℃，时间为30min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为53％，卷曲稳定度为80％，紧缩伸长率为92％，卷缩弹性回复率为92％；该一步法CDP/PET双组份复合丝的断裂强度为2.7cN/dtex，断裂伸长率为40％，总纤度为124dtex。
实施例4
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.7dL/g)和PET熔体(特性粘度为0.57dL/g)分配后，从同一喷丝板上的喷丝孔m(圆形)与喷丝孔n(圆形)挤出制成FDY丝；
其中，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.4:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.4；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为283℃，纺丝箱体II的温度为275℃，纺丝箱体III的温度为282℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差4.9％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度24℃，网络压力0.3MPa，一辊速度2400m/min，一辊温度90℃，二辊速度4100m/min，二辊温度160℃，卷绕速度4030m/min；
(2)进行温度为95℃，时间为28min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组 份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为49％，卷曲稳定度为80％，紧缩伸长率为92％，卷缩弹性回复率为89％；该一步法CDP/PET双组份复合丝的断裂强度为2.7cN/dtex，断裂伸长率为39％，总纤度为108dtex。
实施例5
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.72dL/g)和PET熔体(特性粘度为0.6dL/g)分配后，从同一喷丝板上的喷丝孔m(圆形)与喷丝孔n(圆形)挤出制成FDY丝；
其中，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.5:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.5；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为283℃，纺丝箱体II的温度为277℃，纺丝箱体III的温度为278℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差4.7％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度25℃，网络压力0.2MPa，一辊速度2490m/min，一辊温度91℃，二辊速度4190m/min，二辊温度168℃，卷绕速度4120m/min；
(2)进行温度为102℃，时间为25min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为48％，卷曲稳定度为80％，紧缩伸长率为93％，卷缩弹性回复率为88％；该一步法CDP/PET双组份复合丝的断裂强度为2.7cN/dtex，断裂伸长率为39％，总纤度为100dtex。
实施例6
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.72dL/g)和PET熔体(特性粘度为0.58dL/g)分配后，从同一喷丝板上的喷丝孔m(圆形)与喷丝孔n(圆形)挤出制成FDY丝；
其中，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将 CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.3:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.3；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为283℃，纺丝箱体II的温度为277℃，纺丝箱体III的温度为281℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差4.6％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度25℃，网络压力0.2MPa，一辊速度2440m/min，一辊温度93℃，二辊速度4150m/min，二辊温度176℃，卷绕速度4080m/min；
(2)进行温度为110℃，时间为23min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为50％，卷曲稳定度为81％，紧缩伸长率为93％，卷缩弹性回复率为90％；该一步法CDP/PET双组份复合丝的断裂强度为2.9cN/dtex，断裂伸长率为38％，总纤度为132dtex。
实施例7
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.7dL/g)和PET熔体(特性粘度为0.58dL/g)分配后，从同一喷丝板上的喷丝孔m(椭圆形)与喷丝孔n(圆形)挤出制成FDY丝；
其中，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.3:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.3；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为283℃，纺丝箱体II的温度为276℃，纺丝箱体III的温度为282℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差4.5％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度25℃，网络压力0.3MPa，一辊速度2450m/min，一辊温度93℃，二辊速度4180m/min，二辊温度173℃，卷绕速度4110m/min；
(2)进行温度为111℃，时间为22min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为48％，卷曲稳定度为82％，紧缩伸长率为92％，卷缩弹性回复率为88％；该一步法CDP/PET双组份复合丝的断裂强度为2.9cN/dtex，断裂伸长率为38％，总纤度为160dtex。
实施例8
一步法CDP/PET双组份复合丝的制备方法，其过程如下：
(1)按FDY工艺，将质量之比为50:50的CDP熔体(特性粘度为0.7dL/g)和PET熔体(特性粘度为0.56dL/g)分配后，从同一喷丝板上的喷丝孔m(圆形)与喷丝孔n(“8”字形)挤出制成FDY丝；
其中，所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.4:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.4；
喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C；纺丝箱体I的温度为280℃，纺丝箱体II的温度为275℃，纺丝箱体III的温度为278℃；
在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差4.7％；
所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n；
FDY工艺的参数为：冷却温度23℃，网络压力0.3MPa，一辊速度2410m/min，一辊温度91℃，二辊速度4200m/min，二辊温度170℃，卷绕速度4120m/min；
(2)进行温度为120℃，时间为20min的松弛热处理，即得一步法CDP/PET双组份复合丝；
制得的一步法CDP/PET双组份复合丝由多根PET/CDP并列复合单丝组成，一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布；该一步法CDP/PET双组份复合丝的卷曲收缩率为50％，卷曲稳定度为83％，紧缩伸长率为91％，卷缩弹性回复率为90％；该一步法CDP/PET双组份复合丝的断裂强度为3cN/dtex，断裂伸长率为36％，总纤度为200dtex。

Claims (10)

  1. 一步法CDP/PET双组份复合丝的制备方法，其特征是：按FDY工艺，将CDP熔体和PET熔体分配后，从同一喷丝板上的喷丝孔m与喷丝孔n挤出制成FDY丝后进行松弛热处理，即得一步法CDP/PET双组份复合丝；
    所述分配是指将CDP熔体经分配孔A，同时将PET熔体经分配孔B分配至喷丝孔m中，将CDP熔体经分配孔C，同时将PET熔体经分配孔D分配至喷丝孔n中；
    在分配孔A、分配孔B、分配孔C和分配孔D的入口处，PET熔体和CDP熔体的表观粘度相差不超过5％；
    分配孔A和分配孔B为等高圆柱孔，分配孔A与分配孔B的直径之比为1.30～1.50:1，分配孔C和分配孔D为等高圆柱孔，分配孔C与分配孔D的直径之比为1:1.30～1.50。
  2. 根据权利要求1所述的一步法CDP/PET双组份复合丝的制备方法，其特征在于，PET熔体与CDP熔体的质量之比为50:50。
  3. 根据权利要求1所述的一步法CDP/PET双组份复合丝的制备方法，其特征在于，喷丝孔m或喷丝孔n为圆形、椭圆形或“8”字形喷丝孔。
  4. 根据权利要求1所述的一步法CDP/PET双组份复合丝的制备方法，其特征在于，所有的喷丝孔呈同心圆分布，同一圆上的喷丝孔都为m或者都为n。
  5. 根据权利要求1所述的一步法CDP/PET双组份复合丝的制备方法，其特征在于，喷丝孔m由顺序连接的导孔E、过渡孔和毛细微孔构成，喷丝孔n由顺序连接的导孔F、过渡孔和毛细微孔构成，导孔E同时与分配孔A和分配孔B连接，导孔F同时与分配孔C和分配孔D连接；分配孔A、分配孔B、分配孔C和分配孔D位于纺丝箱体III中的分配板上，PET熔体经纺丝箱体I输送至分配孔B和分配孔D，CDP熔体经纺丝箱体II输送至分配孔A和分配孔C。
  6. 根据权利要求5所述的一步法CDP/PET双组份复合丝的制备方法，其特征在于，PET熔体的特性粘度为0.55～0.60dL/g，纺丝箱体I的温度为280～285℃，CDP熔体的特性粘度为0.70～0.75dL/g，纺丝箱体II的温度为275～280℃，纺丝箱体III的温度为278～282℃。
  7. 根据权利要求6所述的一步法CDP/PET双组份复合丝的制备方法，其特征在于，FDY工艺的参数为：冷却温度23～25℃，网络压力0.20～0.30MPa，一辊速度2400～2500m/min，一辊温度90～95℃，二辊速度4000～4200m/min，二辊温度160～180℃，卷绕速度3930～4120m/min；松弛热处理的温度为90～120℃，时间为20～30min。
  8. 采用如权利要求1～7任一项所述的一步法CDP/PET双组份复合丝的制备方法制得的一步法CDP/PET双组份复合丝，其特征是：由多根PET/CDP并列复合单丝组成，同一束纤维中，一 部分PET/CDP并列复合单丝中CDP与PET的质量比为3:1～5:1，另一部分PET/CDP并列复合单丝中CDP与PET的质量比为1:3～1:5；一步法CDP/PET双组份复合丝中单丝卷曲方向随机分布。
  9. 根据权利要求8所述的一步法CDP/PET双组份复合丝，其特征在于，一步法CDP/PET双组份复合丝的卷曲收缩率为48～53％，卷曲稳定度为80～83％，紧缩伸长率为90～93％，卷缩弹性回复率为88～92％。
  10. 根据权利要求8所述的一步法CDP/PET双组份复合丝，其特征在于，一步法CDP/PET双组份复合丝的断裂强度为2.7～3.0cN/dtex，断裂伸长率为40.0±4.0％，总纤度为100～200dtex。
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