CN115896965A - Eccentric sheath-core polyamide-ammonia composite fully drawn yarn and preparation method thereof - Google Patents
Eccentric sheath-core polyamide-ammonia composite fully drawn yarn and preparation method thereof Download PDFInfo
- Publication number
- CN115896965A CN115896965A CN202211433199.8A CN202211433199A CN115896965A CN 115896965 A CN115896965 A CN 115896965A CN 202211433199 A CN202211433199 A CN 202211433199A CN 115896965 A CN115896965 A CN 115896965A
- Authority
- CN
- China
- Prior art keywords
- core
- nylon
- polyamide
- fully drawn
- drawn yarn
- 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
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 63
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims abstract description 49
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 49
- 229920002292 Nylon 6 Polymers 0.000 claims abstract description 35
- 239000012792 core layer Substances 0.000 claims abstract description 29
- 239000010410 layer Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000004804 winding Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 17
- 229920006052 Chinlon® Polymers 0.000 claims description 16
- 229920002334 Spandex Polymers 0.000 claims description 16
- 239000004759 spandex Substances 0.000 claims description 16
- 239000000155 melt Substances 0.000 claims description 12
- 239000004952 Polyamide Substances 0.000 claims description 9
- 229920002647 polyamide Polymers 0.000 claims description 9
- 239000008041 oiling agent Substances 0.000 claims description 8
- 238000012805 post-processing Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000013329 compounding Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 238000004043 dyeing Methods 0.000 abstract description 29
- 239000000835 fiber Substances 0.000 description 40
- 238000009835 boiling Methods 0.000 description 20
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000012545 processing Methods 0.000 description 8
- 238000009987 spinning Methods 0.000 description 8
- 238000009941 weaving Methods 0.000 description 7
- 235000010290 biphenyl Nutrition 0.000 description 6
- 239000004305 biphenyl Substances 0.000 description 6
- 239000004677 Nylon Substances 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229920001778 nylon Polymers 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 210000004177 elastic tissue Anatomy 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 241001481789 Rupicapra Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Landscapes
- Multicomponent Fibers (AREA)
Abstract
The application provides an eccentric sheath-core polyamide-ammonia composite fully drawn yarn and a preparation method thereof, belonging to the technical field of filament preparation of sheath-core structures. The core layer is an eccentric skin-core structure with an opening on the cross section to expose part of the core layer, the core layer is a thermoplastic polyurethane component, the skin layer is a nylon-6 component, and the composite volume ratio of the skin-core layer is 35-50. This application full stretch yarn has good spiral elasticity of curling, and intensity is high, and the sandwich layer of skin core structure has eccentric opening "naked", because of the opening is little, can effectively avoid dyeing to reveal white and dyeing homogeneity is good.
Description
Technical Field
The application relates to an eccentric sheath-core polyamide-ammonia composite fully drawn yarn and a preparation method thereof, belonging to the technical field of filament preparation of sheath-core structures.
Background
The interweaving of chinlon and spandex in weaving mainly considers that dyeing and finishing conditions of the chinlon and the spandex have a plurality of similarities, and the excellent hygroscopicity of chinlon and the high elasticity of spandex, and the interweaved fabric is widely applied to skin-attached fabrics such as underwear, swimwear, silk stockings and the like. However, the bare spandex is directly used for weaving, and the problems of spandex aging and dyeing color difference exist. In order to make up for the defect, the polyamide coated spandex is usually processed into the polyamide coated yarn, but the polyamide coated yarn has the problems of long processing period, complex process, white spandex and the like. In recent years, with the maturity of a two-component composite spinning technology and the breakthrough of a new material, a T400& T800 two-component composite elastic fiber is developed, the T400& T800 still belongs to a polyester fiber, the moisture absorption and the hand feeling cannot be compared favorably with nylon, and the elasticity also has a certain difference with nylon-ammonia coated yarn.
CN1936123A discloses a PA6/PU composite three-dimensional crimped fiber, the fiber strength is more than 2.8 cN/dtex, the elongation is more than 30%, the crimp number is more than 10/25 mm, the elastic elongation is more than 80%, and the tensile elasticity is more than 90%, but the defects are that: the eccentric sheath-core structure of the composite fiber is a closed structure, the elasticity of the fiber can be influenced to a certain extent, and the uniformity of the cross section shape of the fiber is difficult to ensure.
CN202849648U discloses a spandex covered yarn, which prevents the problem of uneven color when the core exposure phenomenon occurs in the spandex covered yarn, but has the defects that: the production process of the spandex-covered yarn is long, the product cannot realize fine denier, the curled covered yarn is not easy to weave, and the raw material purchasing has limitation.
CN105887218A discloses a nylon high-shrinkage fiber which has the characteristics of softness, drapability, elegant gloss, fine and smooth hand feeling and the like, but the product adopts single-component spinning and cannot form the self-curling elastic effect caused by different thermal shrinkages of two components in composite spinning.
CN109355716A discloses a production method of nylon 6 and nylon 66 parallel composite elastic fibers, but the given composite structure adopts a parallel type, two materials are completely exposed, and color difference is easy to occur when the fabric is woven and dyed due to the fact that the two materials have different color absorption rates; the two raw materials only have different viscosities, and contribute less to the elastic curling change region, and the formed curling elasticity is limited to a certain extent.
CN104975362A discloses a chinlon high-shrinkage composite split type FDY which does not contain spandex but has good elasticity, but the high-shrinkage component is a raw material, no description is provided, if the high-shrinkage component is a split type composite structure, the high-shrinkage component is generally used for polyester-nylon compounding more, fiber opening is carried out through a mechanical or alkali reduction method, and compact materials such as chamois leather velvet fabrics are processed instead of elastic fabrics; if the high shrinkage component is nylon, the split-lobe composite double component has weak curling elasticity.
Disclosure of Invention
In view of this, the present application first provides an eccentric sheath-core polyamide composite fully drawn yarn, which is a bi-component product, has good spiral crimp elasticity, has a strength higher than 3.5 cN/dtex, has an eccentric opening "naked" in a core layer of a sheath-core structure, and can effectively prevent white color from appearing in a dyeing process and has good dyeing uniformity due to a small opening.
Specifically, the application is realized through the following scheme:
an eccentric sheath-core nylon-ammonia composite fully drawn yarn is an eccentric sheath-core structure which is obtained by compounding a nylon 6 component and a thermoplastic polyurethane component and has an opening section so that part of a core layer is exposed, wherein the nylon 6 component is a sheath layer, the thermoplastic polyurethane component is a core layer, and the composite volume ratio of the sheath layer to the core layer is 35-50.
The composite fully drawn yarn is used as a substitute for nylon ammonia coated yarn, is a novel elastic fiber, overcomes the problems of aging of spandex and difficult fine denier of the coated yarn, can keep higher strength of more than or equal to 3.5 cN/dtex by an eccentric sheath-core structure with an opening, ensures the requirement of dyeing uniformity and endows the fully drawn yarn with good spiral curling elasticity by different thermal shrinkage and restoring force of two components, and an appropriate eccentric opening of a core layer is exposed.
Further, as preferable:
the polyamide-6 component accounts for 50% in volume, and the thermoplastic polyurethane component accounts for 50% in volume; or the volume percentage of the low-viscosity nylon-6 component is 35 percent, and the volume percentage of the thermoplastic polyurethane component is 65 percent.
The central angle theta of the eccentric opening is 10-35 degrees. The central angle theta of the exposed part of the core layer is a key index influencing the dye immersion degree, the more the dye is infected along with the increase of the central angle, but the larger the central angle, the larger the color difference of the two components is, and when the central angle is controlled in the range, the dyeing uniformity is basically kept at the level of more than 4.
Meanwhile, the applicant also provides a preparation method of the drawn yarn, which comprises the following steps:
(1) Pretreatment of slicing: taking low-viscosity nylon 6 slices and thermoplastic polyurethane slices as raw materials, heating and drying the low-viscosity nylon 6 slices by using nitrogen until the water content is less than or equal to 800 ppm, heating and drying the thermoplastic polyurethane slices by using nitrogen until the water content is less than or equal to 50ppm, respectively feeding the dried low-viscosity nylon 6 slices and the dried thermoplastic polyurethane slices to respective dry slicing bin, filling nitrogen into the bins for protection, wherein the nitrogen pressure is 0.02MPa, and keeping for later use.
(2) Preparing nylon-spandex composite undrawn yarn: respectively feeding the dried low-viscosity nylon 6 slices and thermoplastic polyurethane slices into a main screw and an auxiliary screw according to the volume percentage of 35-50; melting and extruding at an auxiliary screw extruder to form a thermoplastic polyurethane melt, accurately metering by a metering pump, feeding the thermoplastic polyurethane melt through an auxiliary channel of a spinneret plate, compounding the thermoplastic polyurethane melt with the polyamide 6 melt of the main channel, extruding through a spinneret hole, cooling, oiling and winding to obtain a UDY spinning cake, namely the polyamide-ammonia composite undrawn yarn.
Four heating zones are arranged in the melting and extruding process of the main screw extruder, the heating temperature of each zone is 250-270 ℃, the melt pressure is 10-15 Mpa, and the heating temperature of a main box body is 235-260 ℃. The performance of the chinlon 6 melt can be properly adjusted by changing the heating temperature of the main screw extruder and the temperature of the biphenyl steam, and further reflected as the difference with the thermoplastic polyurethane melt, and the performance indexes are represented by the change of the elongation at break, the breaking strength, the boiling water shrinkage and the fiber crimp number of the fully drawn yarn.
Four sections of heating zones are arranged in the melting and extruding process of the auxiliary main screw extruder, the heating temperature of each zone is 215-235 ℃, the melt pressure is 10-15 Mpa, the melt retention time is less than or equal to 15min, and the heating temperature of an auxiliary box body is 220-240 ℃. The heating temperature of the auxiliary screw extruder and the temperature of the biphenyl steam are changed, the performance of the thermoplastic polyurethane melt can be properly adjusted, and further the difference between the thermoplastic polyurethane melt and the nylon 6 melt is reflected, and the performance indexes are represented by the change of the elongation at break, the breaking strength, the boiling water shrinkage and the fiber crimp number of the fully drawn yarn.
(3) Post-processing: the nylon-ammonia composite undrawn yarn is subjected to drawing, heating, relaxation, shaping, oiling and winding to obtain the nylon-ammonia composite fully drawn yarn.
The nylon 6 melt and the thermoplastic polyurethane melt flow in respective channels, and finally flow into a spinneret plate, and are compounded in a mode that the thermoplastic polyurethane melt is injected into the nylon 6 melt, so that the problems of multiple processing procedures, long time and difficult weaving processing of the nylon-ammonia coated yarns are solved.
Further, it is preferable that:
the relative viscosity (measured by Ubbelohde viscometer) of the low-viscosity polyamide-6 chip is 2.2-2.45, namely the flow time ratio of the chip dissolved in 95.7% sulfuric acid solution and the sulfuric acid per se is measured by 1%. The relative viscosity distribution of the chinlon 6 slices for FDY is generally 2.51-2.53 (Tan Ziliang, the influence of the quality of the chinlon 6 slices on FDY spinning, 1999-3, no. 1, p 1-4), and can even be partially as high as 3.4-3.6 (Yang Feng, the polymerization production technology analysis of the industrial high-viscosity slices for chinlon 6, 2004-4, no. 23, no. 2, p 35-40); in the scheme, the low-viscosity chinlon 6 slices with the relative viscosity of 2.2-2.45 are adopted as a skin layer structure, and the viscosity is set to be beneficial to the good coating property.
The thermoplastic polyurethane slice has a hardness of 75-80 HA (shore hardness), and preferably 77 HA. The polyurethane hardness is generally from 25 to 98 Shore. The hardness of the thermoplastic polyurethane slice is set at a relatively high level, and the thermoplastic polyurethane slice can be used as a core layer during composite molding, so that a good supporting effect can be achieved, and the molding effect of the thermoplastic polyurethane slice is prevented from being affected by the collapse of the peripheral skin layer.
The sheath-core structure of the scheme takes a nylon 6 component formed by low-viscosity nylon 6 slices as a sheath layer, and a thermoplastic polyurethane component formed by high-hardness thermoplastic polyurethane slices as a core layer, wherein the sheath layer is endowed with good inclusion and a wider deformable interval, so that the tensile property of the fully drawn yarn is ensured to be good, and the core layer is endowed with good support property, the structure is relatively compact, so that the high strength of the fully drawn yarn is ensured.
In the step (2), the cooling temperature is 25-30 ℃, the cooling air speed is 0.35-0.45 m/sec, and the monomer suction and discharge is 4-6m/min.
In the step (2), oiling is carried out in a multi-pass oiling mode, oiling is carried out on the polyamide oiling agent firstly, and then oiling is carried out on the spandex oiling agent. Multiple oiling is beneficial to improving the adhesive force of the composite fiber and improving the unwinding and weaving friction tension.
In the step (2), the winding speed is 400-650 m/min, the winding angle is 5-7 degrees, the winding speed is not too high easily in the undrawn yarn forming process, but the winding angle is set to be favorable for forming the initial form of the curl.
In the step (3), the drafting multiplying power is 3-3.5, the temperature of a heating hot plate is 80-100 ℃, the temperature of a loose shaping hot plate is 100-120 ℃, the winding speed is 500-800 m/min, and the winding included angle is 6-8 degrees. The heating relaxation can eliminate the internal stress of the thermoplastic polyurethane component in the composite filament caused by drafting, and improve the stability of the structure of the fully drawn filament; the winding speed is, in turn, expressed primarily as a drawing action on the undrawn yarn and is parametrically expressed as a breaking strength, which, in combination with the draw ratio, changes the drawing action on the fiber. Meanwhile, the change of the winding speed also affects the number of the three-dimensional crimp structures and appears in parameters to cause the change of the number of the fiber crimps, so that the winding speed is not suitable to be excessively large.
The preparation process of the nylon-ammonia composite fully drawn yarn thoroughly changes the current situation, the production process flow is greatly shortened, the fully drawn yarn is endowed with the performance meeting the requirements of nylon-ammonia covered yarn, the nylon-ammonia composite yarn is thinner, the fiber is in a straight yarn state when a yarn drum is unwound for weaving, and the weaving difficulty of the curled covered yarn can be improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a spinneret plate according to the present application;
fig. 2 is a schematic cross-sectional structure view of the nylon-spandex composite fully drawn yarn in the application.
The reference numbers in the figures: 1. a core layer; 2. a skin layer; 3. a spinneret plate; 30. a spinneret plate body; 31. a main channel; 32. a secondary channel; 33. and (4) spinneret orifices.
Detailed Description
Example 1
The raw materials of this example: the method comprises the following steps of taking a low-viscosity chinlon 6 melt with the relative viscosity of 2.2 as a skin layer 2, taking a thermoplastic polyurethane melt with the hardness of 77HA as a core layer 1, and taking the skin-core composite volume percentage as 50.
1. And (3) slicing treatment: firstly, processing low-viscosity chinlon 6 until the water content of dry slices is less than or equal to 800 ppm, processing thermoplastic polyurethane until the water content of the dry slices is less than or equal to 20 ppm, and keeping the nitrogen protection pressure of the dry slices at 0.02Mpa.
2. Preparation of UDY (spinning):
as shown in fig. 1, the spinneret plate 3 of this embodiment includes a spinneret plate body 30, a main passage 31, an auxiliary passage 32, and spinneret holes 33, the spinneret plate body 30 is provided with the main passage 31 and the auxiliary passage 32, the main passage 31 is located at a central position of the spinneret plate 3 and is disposed to penetrate through the spinneret plate body 31, the bottom of the main passage 31 is the spinneret holes 33, the auxiliary passage 32 is disposed at an outer periphery of the main passage 31, the auxiliary passage 32 is disposed to be inclined, and the bottom of the auxiliary passage 32 is communicated with a middle lower portion of the main passage 31.
The spinneret plate is matched with each screw extruder (with a conventional structure, and the description is not shown on the drawing) to carry out spinning, and the specific process is as follows:
the low-viscosity nylon 6 dry slices enter a main screw extruder, four sections of heating zones are arranged in the melt extrusion process, the heating temperature of each zone is 265/260/255/250 ℃, the melt pressure is 10 MPa, a main box body is heated by using medium-temperature biphenyl steam, the heating temperature is 245 ℃, the dry slices in a storage bin enter the main screw extruder to be melt and extruded into nylon 6 melt, and the nylon 6 melt is accurately metered by a metering pump and is sent into a main channel 31 of a spinneret plate 3.
The thermoplastic polyurethane dry slice enters an auxiliary screw extruder, four sections of heating zones are arranged in the melt extrusion process, the heating temperature of each zone is 220/225/230/235 ℃, the melt pressure is 15 MPa, the melt retention time is less than or equal to 10 min, the auxiliary box body is heated by using low-temperature biphenyl steam, the heating temperature is 235 ℃, the obtained thermoplastic polyurethane melt is melt extruded, precisely metered by a metering pump and sent into an auxiliary channel 32 of a spinneret plate 3.
Referring to fig. 1, in the spinneret plate 3, the thermoplastic polyurethane melt entering the secondary channel 32 is compounded with the low viscosity polyamide 6 melt entering the main channel 31, and then is ejected through the spinneret orifice 33.
Because the low-viscosity nylon 6 melt as the skin layer has certain elasticity and cladding property in the main channel, the thermoplastic polyurethane melt as the core layer has certain hardness, and is converged and compounded with the low-viscosity nylon 6 melt through the auxiliary channel 32 and is sprayed out from the spinneret orifice 33, so that an eccentric skin-core structure with a small opening can be formed.
Fiber cooling air: the temperature is 26 ℃, and the wind speed is 0.4 m/sec.
And (3) monomer suction and discharge: wind speed 5 m/min.
Oiling the fiber by adopting a multi-oiling mode, firstly oiling the polyamide oiling agent, and then oiling the polyurethane oiling agent by two times.
The fiber was wound at a winding speed of 450 m/min and a winding angle of 6 °.
And (5) after the winding is finished, obtaining the eccentric sheath-core polyamide-ammonia composite undrawn yarn (UDY).
3. And (3) post-treatment:
UDY post-processing is carried out for drafting, heating relaxation and oiling winding, wherein the drafting multiplying power is 3.5, the hot plate temperature is 85 ℃, the hot plate relaxation temperature is 100 ℃, the winding speed is 550 m/min, and the winding included angle is 7 degrees.
The structure of the eccentric sheath-core nylon-ammonia composite fully drawn yarn prepared in this embodiment is shown in fig. 2: the nylon 6 component is a skin layer 2, the thermoplastic polyurethane component is a core layer 1, the central angle theta of the exposed part of the core layer 1 is 25 degrees, and the skin-core composite volume percentage is 50.
The physical indexes of the nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 60%, the breaking strength is more than or equal to 3.5 cN/dtex, the boiling water shrinkage is 19%, the fiber crimp number is 35/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
Example 2
This example is the same as the arrangement of example 1, except that: the relative viscosity of the low-viscosity chinlon 6 slices is 2.45, the heating temperature of each zone of the main screw extruder is 275/270/265/260 ℃, and the main box body is heated by high-temperature biphenyl steam, and the heating temperature is 255 ℃.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 52 percent, the breaking strength is more than or equal to 2.8 cN/dtex, the boiling water shrinkage is 15 percent, and the fiber crimp number is 16/25 mm; the dyeing uniformity is more than or equal to grade 4.
Compared with the embodiment 1, the relative viscosity of the chinlon 6 component is improved, the extrusion temperature of the main screw and the heating temperature of the biphenyl steam are improved, the parameters show that the elongation at break, the breaking strength and the boiling water shrinkage rate are obviously reduced, and the fiber curling number is reduced; the central angle theta of the exposed part of the core layer 1 is unchanged, the relative change of factors influencing dyeing is small, and the dyeing uniformity is more than or equal to level 4.
Example 3
This example is the same as the arrangement of example 1, except that: the sheath-core composite volume percentage is 35.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 75%, the breaking strength is more than or equal to 3.0 cN/dtex, the boiling water shrinkage is 25%, the fiber crimp number is 50/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
Compared with the embodiment 1, the proportion of the skin layer 2 is relatively reduced, namely the proportion of the chinlon 6 is reduced, the difference between the two components is increased, the elongation at break, the shrinkage rate in boiling water and the fiber curling number are increased, and the change of the breaking strength is not large; but the central angle theta of the exposed part of the core layer 1 is unchanged, the factors influencing dyeing are not changed greatly, and the dyeing uniformity is more than or equal to level 4.
Example 4
This example is the same as the arrangement of example 1, except that: the water content of the dry cutting sheet of the thermoplastic polyurethane is less than or equal to 50ppm.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 50%, the breaking strength is more than or equal to 3.0 cN/dtex, the boiling water shrinkage is 15%, the fiber crimp number is 18/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
Compared with the embodiment 1, the range of the requirement of the water content of the thermoplastic polyurethane dry-cut sheet is widened, the increase of water molecules causes the reduction of the melt viscosity of the thermoplastic polyurethane, the difference of the viscosities of the two components is reduced, the elongation at break, the shrinkage rate in boiling water and the fiber crimp number are increased, and the change of the breaking strength is not large; but the central angle theta of the exposed part of the core layer 1 is unchanged, the factors influencing dyeing are not changed greatly, and the dyeing uniformity is more than or equal to level 4.
Example 5
This example is the same as the arrangement of example 1, except that: the residence time of the thermoplastic polyurethane melt is less than or equal to 15min.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 55%, the breaking strength is more than or equal to 3.0 cN/dtex, the boiling water shrinkage is 15%, the fiber crimp number is 18/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
Compared with the example 1, the thermoplastic polyurethane melt has longer residence time, can be thermally degraded, and causes the viscosity to be reduced and the elasticity to be weakened, and is externally represented by the loss of elongation at break and breaking strength, and the reduction of fiber crimping number and boiling water shrinkage; the central angle theta of the exposed part of the core layer 1 is unchanged, the relative change of factors influencing dyeing is small, and the dyeing uniformity is more than or equal to level 4.
Example 6
This example is the same as the arrangement of example 1, except that: the central angle of the core opening portion was 35 °.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the breaking elongation is 63 percent, the breaking strength is more than or equal to 3.3 cN/dtex, the boiling water shrinkage is 21 percent, the fiber crimp number is 38/25 mm, and the dyeing uniformity is more than or equal to 3 level.
Compared with the example 1, the factors influencing the mechanical properties of the drawn yarn such as strength and elongation are not changed, the central angle theta is increased, the opening and the exposure of the core layer 1, namely the thermoplastic polyurethane are increased, the dyeing area ratio of the core layer 1 to the skin layer 2 is increased, the probability of occurrence of color difference is increased, and the dyeing uniformity is reduced.
Example 7
This example is the same as the arrangement of example 1, except that: the thermoplastic polyurethane of the core layer 1 has no openings.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 56%, the breaking strength is more than or equal to 3.0 cN/dtex, the boiling water shrinkage is 17%, the fiber crimp number is 21/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
Compared with the embodiment 1, the core layer 1 in the embodiment completely covers the inside of the skin layer 2, and the high thermal shrinkage three-dimensional crimp elasticity can not be generated during the heat treatment, so the elasticity can not be fully exerted, and the elongation at break and the fiber crimp number are both reduced to a certain extent.
Example 8
This example is the same as the arrangement of example 1, except that: only one oiling process of chinlon oiling agent is arranged for oiling.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 58%, the breaking strength is more than or equal to 3.5 cN/dtex, the boiling water shrinkage is 17%, the fiber crimp number is 25/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
Compared with the embodiment 1, only one oiling step is arranged, the influence of parameters such as elongation at break, strength and the like is small, but the phenomena of composite fiber adhesion, difficult unwinding, large weaving friction tension and the like exist in the spinning process.
Example 9
This example is the same as the arrangement of example 1, except that: the fiber winding speed was 800 m/min, and the post-processing draft ratio was 3.0.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 56%, the breaking strength is more than or equal to 3.7 cN/dtex, the boiling water shrinkage is 17%, the fiber crimp number is 30/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
The winding speed is increased, the post-processing draft ratio is reduced, the stretching effect on the fiber is enhanced, and the breaking strength is favorably improved, so that the breaking strength of the embodiment is improved compared with that of the embodiment 1, but the increase of the speed can destroy part of the three-dimensional crimp structure, so that the fiber crimp number is reduced, and the elongation at break and the boiling water shrinkage rate are reduced.
Example 10
This example is the same as the arrangement of example 1, except that: the post-drawing processing is not provided with relaxation heating.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 55%, the breaking strength is more than or equal to 3.5 cN/dtex, the boiling water shrinkage is 15%, the fiber crimp number is 27/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
By comparison with the processing procedure of example 1, it can be seen that: the heating relaxation can eliminate the internal stress of the thermoplastic polyurethane component in the composite filament caused by drafting, and improve the stability of the fully drawn filament structure, so the breaking strength is not changed greatly, but the boiling water shrinkage and the breaking elongation are reduced, and the fiber crimp number is obviously reduced.
Example 11
This example is the same as the arrangement of example 1, except that: and oiling with an oiling agent is not set in the post-processing drafting.
The physical indexes of the prepared nylon-ammonia composite sheath-core fully drawn yarn are as follows: the elongation at break is 60%, the breaking strength is more than or equal to 3.5 cN/dtex, the boiling water shrinkage is 17%, the fiber crimp number is 32/25 mm, and the dyeing uniformity is more than or equal to 4 grade.
By comparison with the processing procedure of example 1, it can be seen that: the tensile property is basically fixed after post-processing drafting, so that the elongation at break and the strength at break are not influenced if oiling treatment is carried out in the winding stage; however, when the winding oiling treatment was not carried out, the fiber cohesion was relatively weak, the compounding effect was not as satisfactory as in example 1, and the boiling water shrinkage and the fiber crimp number were reduced.
Claims (10)
1. The utility model provides an eccentric skin-core type polyamide-ammonia composite fully drawn yarn which characterized in that: the composite fully drawn yarn is an eccentric sheath-core structure with an opening section to expose part of a core layer, the core layer is a thermoplastic polyurethane component, the sheath layer is a nylon 6 component, and the composite volume ratio of the sheath-core layer is 35-50.
2. The eccentric sheath-core polyamide composite fully drawn yarn according to claim 1, characterized in that: the polyamide-6 component accounts for 50% by volume, and the thermoplastic polyurethane component accounts for 50% by volume; or the polyamide-6 component accounts for 35% by volume, and the thermoplastic polyurethane component accounts for 65% by volume.
3. The eccentric sheath-core polyamide-ammonia composite fully drawn yarn according to claim 1, characterized in that: the central angle theta of the eccentric opening is 10-35 degrees.
4. The preparation method of the eccentric sheath-core polyamide-ammonia composite fully drawn yarn of claim 1, which is characterized by comprising the following steps:
(1) Pretreatment of slicing: taking low-viscosity nylon 6 slices and thermoplastic polyurethane slices as raw materials, drying the low-viscosity nylon 6 slices until the water content is less than or equal to 800 ppm, drying the thermoplastic polyurethane slices until the water content is less than or equal to 50ppm,
(2) Preparing nylon-spandex composite undrawn yarn: feeding the dried low-viscosity nylon 6 slices into a main screw, performing melt extrusion by an extruder to form a nylon 6 melt, metering the nylon 6 melt by a metering pump, and feeding the nylon 6 melt into a main channel of a spinneret plate; feeding the dried thermoplastic polyurethane slices into an auxiliary screw extruder, melting and extruding to form a thermoplastic polyurethane melt, accurately metering by a metering pump, feeding the thermoplastic polyurethane melt through an auxiliary channel of a spinneret plate, compounding the thermoplastic polyurethane melt with a low-viscosity polyamide-6 melt, extruding, cooling, oiling and winding through a spinneret hole to obtain polyamide-ammonia composite undrawn yarn,
four heating zones are arranged in the melting and extruding process of the main screw extruder, the heating temperature of each zone is 250-270 ℃, the melt pressure is 10-15 Mpa, the heating temperature of a main box body is 235-260 ℃,
four sections of heating zones are arranged in the melting and extruding process of the auxiliary screw extruder, the heating temperature of each zone is 215-235 ℃, the melt pressure is 10-15 Mpa, the melt retention time is less than or equal to 15min, the heating temperature of an auxiliary box body is 220-240 ℃,
(3) Post-processing: the nylon-ammonia composite undrawn yarn is subjected to drawing, heating, relaxation, shaping, oiling and winding to obtain the nylon-ammonia composite fully drawn yarn.
5. The preparation method of the eccentric sheath-core polyamide-ammonia composite fully drawn yarn according to claim 4, characterized in that: the relative viscosity of the low-viscosity chinlon 6 slices is 2.2-2.45.
6. The preparation method of the eccentric sheath-core polyamide-ammonia composite fully drawn yarn according to claim 4, characterized in that: the thermoplastic polyurethane slice has a hardness of 75-80 HA.
7. The method for preparing the eccentric sheath-core polyamide composite fully drawn yarn as claimed in claim 4, wherein in the step (2), the cooling parameters are set as follows: the temperature is 25-30 ℃, the wind speed is 0.35-0.45 m/sec, and the monomer suction and discharge is 4-6m/min.
8. The preparation method of the eccentric sheath-core polyamide-ammonia composite fully drawn yarn according to claim 4, characterized in that: in the step (2), the winding speed is 400-650 m/min, and the winding angle is 5-7 degrees.
9. The preparation method of the eccentric sheath-core polyamide-ammonia composite fully drawn yarn according to claim 5, characterized in that: in the step (2), oiling is carried out in a multi-pass oiling mode, oiling is carried out on the polyamide oiling agent, and then oiling is carried out on the spandex oiling agent.
10. The preparation method of the eccentric sheath-core polyamide-ammonia composite fully drawn yarn according to claim 5, characterized in that: in the step (3), the drafting multiplying power is 3-3.5, the temperature of a heating hot plate is 80-100 ℃, the temperature of a relaxation shaping hot plate is 100-120 ℃, the winding speed is 500-800 m/min, and the winding included angle is 6-8 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433199.8A CN115896965A (en) | 2022-11-16 | 2022-11-16 | Eccentric sheath-core polyamide-ammonia composite fully drawn yarn and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433199.8A CN115896965A (en) | 2022-11-16 | 2022-11-16 | Eccentric sheath-core polyamide-ammonia composite fully drawn yarn and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115896965A true CN115896965A (en) | 2023-04-04 |
Family
ID=86480847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211433199.8A Pending CN115896965A (en) | 2022-11-16 | 2022-11-16 | Eccentric sheath-core polyamide-ammonia composite fully drawn yarn and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115896965A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5876522A (en) * | 1981-11-02 | 1983-05-09 | Teijin Ltd | Preparation of crimped elastic fiber |
| JPH0253925A (en) * | 1988-08-12 | 1990-02-22 | Toray Ind Inc | Yarn for stocking and stocking product comprising the same yarn |
| EP0378194A2 (en) * | 1989-01-12 | 1990-07-18 | Kanebo, Ltd. | Composite filament yarn and process and spinneret for manufacturing the same |
| JPH03193915A (en) * | 1989-12-20 | 1991-08-23 | Kanebo Ltd | Conjugate fiber and production thereof |
| JPH03220302A (en) * | 1990-01-26 | 1991-09-27 | Kanebo Ltd | Stocking |
| CN1058813A (en) * | 1990-04-27 | 1992-02-19 | 钟纺株式会社 | Elastic core and sheath type bicomponent filament yarn and contain the fabric construction of this bicomponent filament yarn |
| CN1936123A (en) * | 2006-10-18 | 2007-03-28 | 东华大学 | PA6/PU composite three-dimensional crimp fiber and its preparing method |
| CN102171390A (en) * | 2008-09-30 | 2011-08-31 | Kb世联株式会社 | Composite fiber for stockings |
| WO2018235754A1 (en) * | 2017-06-23 | 2018-12-27 | 東レ株式会社 | Polyurethane-nylon 6 eccentric sheath-core conjugate fiber |
-
2022
- 2022-11-16 CN CN202211433199.8A patent/CN115896965A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5876522A (en) * | 1981-11-02 | 1983-05-09 | Teijin Ltd | Preparation of crimped elastic fiber |
| JPH0253925A (en) * | 1988-08-12 | 1990-02-22 | Toray Ind Inc | Yarn for stocking and stocking product comprising the same yarn |
| EP0378194A2 (en) * | 1989-01-12 | 1990-07-18 | Kanebo, Ltd. | Composite filament yarn and process and spinneret for manufacturing the same |
| JPH03193915A (en) * | 1989-12-20 | 1991-08-23 | Kanebo Ltd | Conjugate fiber and production thereof |
| JPH03220302A (en) * | 1990-01-26 | 1991-09-27 | Kanebo Ltd | Stocking |
| CN1058813A (en) * | 1990-04-27 | 1992-02-19 | 钟纺株式会社 | Elastic core and sheath type bicomponent filament yarn and contain the fabric construction of this bicomponent filament yarn |
| CN1936123A (en) * | 2006-10-18 | 2007-03-28 | 东华大学 | PA6/PU composite three-dimensional crimp fiber and its preparing method |
| CN102171390A (en) * | 2008-09-30 | 2011-08-31 | Kb世联株式会社 | Composite fiber for stockings |
| WO2018235754A1 (en) * | 2017-06-23 | 2018-12-27 | 東レ株式会社 | Polyurethane-nylon 6 eccentric sheath-core conjugate fiber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20200087820A1 (en) | Eccentric core-sheath composite fiber and combined filament yarn | |
| JP6973079B2 (en) | Sea-island type composite fiber, false plying and fiber structure with excellent hygroscopicity | |
| EP2679709B1 (en) | Cationic-dyeable polyester fiber and conjugated fiber | |
| CN101558190A (en) | Process of producing ultra fine microdenier filaments and fabrics made thereof | |
| CN109477254B (en) | False twist textured yarn formed from dyeable polyolefin fibers | |
| JP7200390B2 (en) | Elastic composite fiber and method for producing the same | |
| US5093061A (en) | Deep dyeing conjugate yarn processes | |
| KR100783800B1 (en) | Manufacturing method of stretch polyester composite fiber and its products | |
| CN114008255B (en) | Polyester composite fiber with good elasticity and preparation method thereof | |
| KR100700796B1 (en) | Spontaneous high-crimp polyester multiple staple fiber, and spun yarn and nonwaven fabric containing the same | |
| CN110938889B (en) | Special-shaped chinlon 6 filament and preparation method thereof | |
| CN115896965A (en) | Eccentric sheath-core polyamide-ammonia composite fully drawn yarn and preparation method thereof | |
| US3423923A (en) | Crimped multifilament yarn | |
| KR100496044B1 (en) | High self-crimping thermoplastic conjugate yarn which have poly-leaves cross section and process of producing thereof | |
| KR100519597B1 (en) | Method of preparing polyester fiber having improved elasticity and the polyester fiber thereby | |
| JP4505960B2 (en) | High stretch durability polyester composite fiber and manufacturing method | |
| RU2344213C2 (en) | Polyester differential shrinkage combined filament thread and method for manufacturing thereof | |
| CN113862827B (en) | Parallel composite elastic fiber, preparation method and application thereof, and composite spinning assembly | |
| KR101939942B1 (en) | Polyethylene terephthalate filament having excellent light heat generation performance and color fastness | |
| JP2000034641A (en) | Polyamide-based yarn fabric and its production | |
| CN111101236B (en) | Self-curling elastic combined filament yarn for knitted denim and preparation method thereof | |
| JP2019515157A (en) | Core-sheath composite fiber and woven fabric thereof | |
| KR20100113785A (en) | Side by side type polyester conjugated yarn with excellent crimp property | |
| WO2024043287A1 (en) | Synthetic fibers | |
| CN118007261A (en) | Preparation method of silicon-based composite nylon fiber |
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 |