CN117888249A - Nylon core-spun yarn and preparation method thereof - Google Patents
Nylon core-spun yarn and preparation method thereof Download PDFInfo
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- CN117888249A CN117888249A CN202410229769.4A CN202410229769A CN117888249A CN 117888249 A CN117888249 A CN 117888249A CN 202410229769 A CN202410229769 A CN 202410229769A CN 117888249 A CN117888249 A CN 117888249A
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- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Multicomponent Fibers (AREA)
Abstract
The invention discloses a nylon core-spun yarn and a preparation method thereof, wherein the preparation method of the nylon core-spun yarn comprises the following steps: heating and melting the dried skin material, and coating the skin material on the surface of the nylon yarn to prepare a core-spun material; cooling the core-spun material and then drafting to obtain the core-spun yarn; wherein the core layer is nylon yarn, which is one or more of aliphatic PA, aliphatic-aromatic PA and aromatic PA; the skin material is one of TPU, TPEE, nylon and polyester, the melting point is selected from 100-240 ℃, and the melt index under the melting point is more than 15g/10min. The invention provides a nylon core-spun yarn and a preparation method thereof, wherein the nylon is coated by a low-temperature hot-melt material, so that the performance of the nylon yarn is effectively maintained, the defects of the nylon yarn are overcome, and the application range of the nylon yarn is expanded.
Description
Technical Field
The invention relates to the field of textile yarns, in particular to a nylon core-spun yarn and a preparation method thereof.
Background
In the weaving technique of the string embroidery vamp, a unique three-layer yarn structure is adopted to provide comfort and durability. The innermost layer is a skin layer, and is made of skin-friendly materials, so that the contact with the skin of the foot is soft and comfortable. The middle layer is a reinforcing layer, and provides stable support through high-strength yarns, so that the structural stability of the vamp is ensured. The outermost layer is used as a protective layer, and is subjected to strengthening treatment aiming at the easily worn area of the vamp, so that the service life of the shoe is prolonged. The yarns adopted by the reinforcing layer are converted into the fabric through a hot press molding technology. The yarn is made of high-strength materials, so that the overall strength of the yarn is ensured, and meanwhile, the melting point is also required, so that the yarn is suitable for the technological requirements of hot press molding, and the yarn is ensured not to be melted or deformed in the hot press process.
Polyamides, commonly known as Nylon (Nylon), are a widely used thermoplastic resin. The molecular structure of the nylon contains repeated amide groups- (NHCO) which endow nylon with a series of excellent properties. Nylon is excellent in mechanical properties, heat resistance, abrasion resistance, chemical resistance and self-lubricating properties. In addition, nylon also has a low friction coefficient and a certain flame retardance, so that the nylon has wide application in various fields. Particularly in the field of shoe materials, nylon fibers are ideal choices in the processing process due to their high strength and excellent physical properties. Although nylon performs well in many applications, there is still a certain difference in performance between different varieties. For example, nylon-66 and nylon-6 used for clothing have excellent properties, but are still to be improved in hygroscopicity and dyeability. This limits their range of application to a certain extent. In order to continuously expand the application field of nylon and meet the diversified demands, researchers continuously explore and improve the manufacturing process and formula of nylon so as to further improve the comprehensive performance of nylon.
Disclosure of Invention
The invention aims to overcome the defects or problems in the background art and provides a nylon core-spun yarn and a preparation method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the first technical scheme relates to a preparation method of nylon core-spun yarn, which comprises the following steps: heating and melting the dried skin material, and coating the skin material on the surface of the nylon yarn to prepare a core-spun material; cooling the core-spun material and then drafting to obtain a core-spun yarn; cooling the core-spun material and then drafting to obtain the core-spun yarn; wherein the core layer is the nylon yarn and is one or more of aliphatic PA, aliphatic-aromatic PA and aromatic PA; the skin layer material is one of TPU, TPEE, nylon and polyester, the melting point selection range is 100-240 ℃, and the melt index under the melting point is more than 15g/10min.
The second technical scheme is based on the first technical scheme, wherein the mass ratio of the sheath material to the nylon yarn in the core-spun yarn is 1:0.2-3.
The third technical scheme is based on the first technical scheme, wherein the nylon yarn is one or more of aliphatic PA, aliphatic-aromatic PA and aromatic PA, one or more of antibacterial, anti-ultraviolet and anti-aging functional auxiliary agents can be added into the nylon yarn, and color masterbatch can be added into the nylon yarn for color matching.
The fourth technical scheme is based on the third technical scheme, wherein the nylon yarn is of a monofilament or multifilament structure and can be blended with yarns made of other materials, the blended yarn is one or more of terylene, aramid, ultra-high molecular weight polyethylene, polyimide, carbon fiber, spandex and LCP, and the blended yarn is wound or woven on the outer layer of the nylon yarn.
The fifth technical scheme is based on the first technical scheme, wherein one or more functional additives of antibiosis, ultraviolet resistance, flame retardance and yellowing resistance can be added into the skin layer material, and color matching can be performed by adding a color masterbatch into the skin layer material.
The sixth technical scheme is based on the first technical scheme, wherein the heating and melting of the skin material is carried out by adopting a double-screw extruder for melt extrusion, and the set temperature range of the double-screw extruder is 110 ℃ to 269 ℃ which is larger than the melting point of the skin material by 0 ℃ to 20 ℃.
The seventh technical scheme is based on the sixth technical scheme, wherein when the skin layer material is heated and melted for extrusion, the nylon yarn is pulled to a double-screw extruder die, the skin layer material is coated on the surface of the nylon yarn after being heated and melted, and the pulling speed range when the nylon yarn is coated by the skin layer material is 50m/min-500m/min.
The eighth technical scheme is based on the seventh technical scheme, wherein the cooling of the core-spun material is performed by adopting a cold water tank, and the temperature range of the cold water tank is 0-15 ℃.
A ninth technical means is a nylon core-spun yarn manufactured based on the method for manufacturing a nylon core-spun yarn of any one of the first to eighth technical means.
From the above description of the present invention, compared with the prior art, the present invention has the following advantages:
in the first technical solution and related embodiments, the method for preparing the nylon core-spun yarn achieves significant enhancement of the core nylon yarn by selecting a specific sheath material and adopting a melt spinning process. The method not only highlights the inherent strength of nylon, but also effectively improves the yellowing problem possibly occurring in nylon. The skin material is a low-temperature hot-melt material such as TPU, TPEE, nylon or polyester, and the like, which shows good melt index in the melting point range, can be uniformly and tightly coated on the surface of nylon yarn, and is formed into the fabric through hot-press molding. The core nylon yarn is formed by combining one or more of aliphatic PA, aliphatic-aromatic PA and aromatic PA, and can be prepared by a method of polycondensation reaction of dibasic acid and diamine, lactam polycondensation or ring-opening polymerization and the like. The raw materials are flexible in source and can be derived from petroleum base, biological base or the combination of the petroleum base and the biological base. Although the bio-based nylon has the advantage of environmental protection, the cost is higher and the performance is slightly lower, so that the combination of the skin layer and the core layer can improve the ratio of the bio-based material while maintaining the performance of the nylon yarn, thereby realizing a product with more cost performance and environmental protection. The core-spun yarn prepared by the preparation method of the nylon core-spun yarn can be used as a hot-press molding material and is suitable for a plurality of application fields such as clothing, shoes and the like.
In the second technical scheme and related embodiments, the structural design of the core spun yarn uses nylon yarn as the core layer, exerts the super strong skeleton function thereof, and provides solid strength and structural stability for the whole yarn. The skin material plays a role of protection and adhesion, and can be formed into a fabric with nylon yarns through hot press molding. The selection of the sheath-core ratio of 1:0.2-3 has flexibility and can be adjusted according to the specific process requirements of material molding. The adjustability from thin to thick ensures that the skin material can fully play the protection function in the coating process, and meanwhile, the original performance of the nylon yarn is not excessively influenced, so that the integral performance of the core-spun yarn is improved, and the wider possibility is provided for the application of the core-spun yarn in the fields of materials such as clothing, vamp and the like.
In the third technical solution and related embodiments, one or more functional additives, such as an antibacterial agent, an anti-uv agent, an anti-aging agent, etc., may be added to the nylon yarn, and these additives can impart additional functional properties to the yarn, such as inhibiting bacterial growth, resisting uv damage, and improving aging resistance. Meanwhile, the nylon yarn can be mixed with color masterbatch to meet the demands of different application scenes on yarn colors, and the application range of the nylon yarn is widened.
In a fourth aspect and related embodiments, the nylon yarn may be of monofilament or multifilament construction, the flexibility enabling the nylon yarn to meet more diverse needs in performance. The nylon yarn can be blended with yarns made of other materials such as terylene, aramid fiber, ultra-high molecular weight polyethylene, polyimide, carbon fiber, spandex, LCP and the like. The blending technology combines the advantages of different materials and improves the comprehensive properties of the nylon yarn, such as strength, wear resistance, high temperature resistance and the like.
In the fifth technical solution and related embodiments, one or more functional additives, such as an antibacterial agent, an anti-ultraviolet agent, a flame retardant agent, an anti-yellowing agent, and the like, may be added to the skin layer material. These functional aids can impart additional protective properties to the skin material, such as inhibiting bacterial growth, reducing ultraviolet damage, improving flame retardant properties, and resistance to yellowing. Meanwhile, the cortex material can be mixed by adding color masterbatch, so that the requirements of different application scenes on yarn colors are met, and the application range of the cortex material is widened.
In a sixth aspect and related embodiments, efficient mixing and shearing action of the twin screw extruder promotes uniform melting of the skin material, thereby ensuring consistent thickness and quality of the skin coating on the nylon yarn surface. The twin screw extruder is set at a temperature of 110 ℃ to 269 ℃ which is required to be 0 ℃ to 20 ℃ higher than the melting point of the sheath material, so that the sheath material can be ensured to be in a molten state and have sufficient fluidity to be spun. The sheath material may dissolve when it reaches its melting point temperature, but at this point the fluidity may not be sufficient for spinning. The temperature is required to be raised by 0-20 ℃ again, so that the melt index of the sheath material is more than 15g/10min, and the sheath material in the state has good fluidity and can be spun. Such temperature settings ensure that the skin material is heated uniformly and sufficiently during the melting process, avoiding quality problems caused by overheating or underheating.
In a seventh aspect and related embodiments, the nylon yarn is drawn onto a die of a twin screw extruder as the skin material is melted by heating. In this process, the melted sheath material rapidly and uniformly coats the surface of the nylon yarn. The draw speed determines the packing ratio of the core spun yarn. The skin material coating is thin if the traction speed is high. Therefore, the traction speed needs to be adjusted according to the required coating ratio. By controlling the drawing speed, it is ensured that the sheath material forms a desired uniform, continuous and tight coating on the nylon yarn surface.
In an eighth aspect and related embodiments, cooling temperature control in the cold water tank needs to consider a cooling rate of the skin material. The molten state of the skin material is coated on the nylon yarn and then needs to be cooled down rapidly, so that the skin material is coated on the outer layer. If the traction speed is high, a lower cooling temperature needs to be selected because the contact time of the core-spun yarn with water is shorter. During cooling, two cold water tanks are possibly needed for cooling, and rapid cooling is realized by adjusting the length of the core-spun yarn passing through the cooling tanks. In general, the selection of a higher cooling temperature may more effectively preserve the properties of the skin material.
In the ninth technical scheme and related embodiments, the nylon core-spun yarn manufactured by the manufacturing method can effectively keep the performance of the nylon yarn, and meanwhile, the defects of the nylon yarn are improved by utilizing the performance of the skin material, so that the nylon core-spun yarn has good cost performance and the application range of the nylon core-spun yarn is expanded.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in connection with the embodiments of the present invention. It is to be understood that the described embodiments are preferred embodiments of the invention and should not be taken as excluding other embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
In the claims, the description of the present invention, unless explicitly defined otherwise, the use of the terms "first", "second" or "third", etc., are intended to distinguish between different objects and are not intended to describe a particular sequence.
In the claims, the description of the present invention, unless explicitly defined otherwise, references to directional words such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counter-clockwise", etc. indicate a directional or positional relationship, are merely for convenience of describing the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the specific scope of the present invention.
In the claims, specification and claims of the present invention, unless explicitly defined otherwise, the term "fixedly connected" or "fixedly connected" should be construed broadly, i.e. any connection between them without a displacement relationship or a relative rotation relationship, that is to say includes non-detachably fixedly connected, integrally connected and fixedly connected by other means or elements.
In the claims and specification of the present invention, the terms "comprising," having, "and variations thereof as used herein, are intended to be" including but not limited to.
The embodiment of the invention provides a nylon core-spun yarn and a preparation method thereof, and the preparation method of the nylon core-spun yarn comprises the following steps:
heating and melting the dried skin material, and coating the skin material on the surface of the nylon yarn to prepare a core-spun material; and cooling the core-spun material, and then drafting to obtain the core-spun yarn. The mass ratio of the sheath material to the nylon yarn in the core-spun yarn is 1:0.2-3.
Specifically, the cortex material is heated and melted and extruded by adopting a double-screw extruder, meanwhile, the nylon yarn is pulled to a die of the double-screw extruder, the cortex material is coated on the surface of the nylon yarn after being heated and melted, and the cooling of the core-spun material is performed by adopting a cold water tank. In this example, the twin screw extruder was set to a temperature in the range of 110 ℃ to 269 ℃ which was 0 ℃ to 20 ℃ above the melting point of the skin material. When the skin layer material is heated and melted, the traction speed range of the nylon yarn when the nylon yarn is coated by the skin layer material is 50m/min-500m/min. The temperature range of the cooling water tank is 0-15 ℃ when the core-spun material is cooled.
Specifically, the core layer is nylon yarn, which is one or more of aliphatic PA, aliphatic-aromatic PA, and aromatic PA. The nylon yarn can be added with one or more of antibacterial, anti-ultraviolet and aging-resistant functional auxiliary agents; nylon yarns may be color-coded with the addition of a color master. The nylon yarn is of a monofilament or multifilament structure, and can be blended with one or more of terylene, aramid, ultra-high molecular weight polyethylene, polyimide, carbon fiber, spandex and other material yarns of LCP (liquid crystal polymer), and the other material yarns are wound or woven on the outer layer of the nylon yarn.
Specifically, the skin material is one of TPU, TPEE, nylon and polyester, the melting point selection range is 100-240 ℃, and the melt index under the melting point is more than 15g/10min. One or more functional auxiliary agents for resisting bacteria, ultraviolet light, flame retardance and yellowing can be added into the skin layer material, and color masterbatch can be added into the skin layer material for color mixing. In this embodiment, to meet the melting point selection range, the TPU is modified TPU, the TPEE is modified TPEE, the nylon is copolymerized nylon, and the polyester is modified polyester or other low melting polyester, for example, the low melting polyester may be one or two of polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polytrimethylene terephthalate (PTT). The epithelial layer materials are all commercially available products.
In this embodiment, the efficient mixing and shearing action of the twin screw extruder promotes uniform melting of the skin material, thereby ensuring consistent thickness and quality of the skin coating the nylon yarn surface. The twin screw extruder is set at a temperature of 110 ℃ to 269 ℃ which is required to be 0 ℃ to 20 ℃ higher than the melting point of the sheath material, so that the sheath material can be ensured to be in a molten state and have sufficient fluidity to be spun. The sheath material may dissolve when it reaches its melting point temperature, but at this point the fluidity may not be sufficient for spinning. The temperature is required to be raised by 0-20 ℃ again, so that the melt index of the sheath material is more than 15g/10min, and the sheath material in the state has good fluidity and can be spun. Such temperature settings ensure that the skin material is heated uniformly and sufficiently during the melting process, avoiding quality problems caused by overheating or underheating.
In this example, the nylon yarn is drawn onto the die of a twin screw extruder as the skin material is melted by heating. In this process, the melted sheath material rapidly and uniformly coats the surface of the nylon yarn. The draw speed determines the packing ratio of the core spun yarn. The skin material coating is thin if the traction speed is high. Therefore, the traction speed needs to be adjusted according to the required coating ratio. By controlling the drawing speed, it is ensured that the sheath material forms a desired uniform, continuous and tight coating on the nylon yarn surface.
In this embodiment, the cooling temperature control in the cold water tank needs to consider the cooling rate of the skin material. The molten state of the skin material is coated on the nylon yarn and then needs to be cooled down rapidly, so that the skin material is coated on the outer layer. If the traction speed is high, a lower cooling temperature needs to be selected because the contact time of the core-spun yarn with water is shorter. During cooling, two cold water tanks are possibly needed for cooling, and rapid cooling is realized by adjusting the length of the core-spun yarn passing through the cooling tanks. In general, the selection of a higher cooling temperature may more effectively preserve the properties of the skin material.
In the embodiment, the structural design of the core spun yarn uses nylon yarn as a core layer, plays a super strong skeleton role, and provides solid strength and structural stability for the whole yarn. The skin material plays a role of protection and adhesion, and can be formed into a fabric with nylon yarns through hot press molding. The selection of the sheath-core ratio of 1:0.2-3 has flexibility and can be adjusted according to the specific process requirements of material molding. The adjustability from thin to thick ensures that the skin material can fully play the protection function in the coating process, and meanwhile, the original performance of the nylon yarn is not excessively influenced, so that the integral performance of the core-spun yarn is improved, and the wider possibility is provided for the application of the core-spun yarn in the fields of materials such as clothing, vamp and the like.
In this embodiment, one or more functional additives, such as an antibacterial agent, an anti-ultraviolet agent, an anti-aging agent, etc., may be added to the nylon yarn, and these additives can impart additional functional properties to the yarn, such as inhibiting bacterial growth, resisting ultraviolet damage, and improving anti-aging properties. Meanwhile, the nylon yarn can be mixed with color masterbatch to meet the demands of different application scenes on yarn colors, and the application range of the nylon yarn is widened.
In this embodiment, the nylon yarn may be of a monofilament or multifilament construction, and this flexibility allows the nylon yarn to meet more varied performance requirements. The nylon yarn can be blended with yarns made of other materials such as terylene, aramid fiber, ultra-high molecular weight polyethylene, polyimide, carbon fiber, spandex, LCP and the like. The blending technology combines the advantages of different materials and improves the comprehensive properties of the nylon yarn, such as strength, wear resistance, high temperature resistance and the like.
In this embodiment, one or more functional additives, such as an antibacterial agent, an anti-ultraviolet agent, a flame retardant, an anti-yellowing agent, and the like, may be added to the skin layer material. These functional aids can impart additional protective properties to the skin material, such as inhibiting bacterial growth, reducing ultraviolet damage, improving flame retardant properties, and resistance to yellowing. Meanwhile, the cortex material can be mixed by adding color masterbatch, so that the requirements of different application scenes on yarn colors are met, and the application range of the cortex material is widened.
In the embodiment, the preparation method of the nylon core-spun yarn realizes the remarkable enhancement of the nylon yarn of the core layer by selecting a specific skin layer material and adopting a melt spinning process. The method not only highlights the inherent strength of nylon, but also effectively improves the yellowing problem possibly occurring in nylon. The skin material is a low-temperature hot-melt material such as TPU, TPEE, nylon or polyester, and the like, which shows good melt index in the melting point range, can be uniformly and tightly coated on the surface of nylon yarn, and is formed into the fabric through hot-press molding. The core nylon yarn is formed by combining one or more of aliphatic PA, aliphatic-aromatic PA and aromatic PA, and can be prepared by a method of polycondensation reaction of dibasic acid and diamine, lactam polycondensation or ring-opening polymerization and the like. The raw materials are flexible in source and can be derived from petroleum base, biological base or the combination of the petroleum base and the biological base. Although the bio-based nylon has the advantage of environmental protection, the cost is higher and the performance is slightly lower, so that the combination of the skin layer and the core layer can improve the ratio of the bio-based material while maintaining the performance of the nylon yarn, thereby realizing a product with more cost performance and environmental protection. The core-spun yarn prepared by the preparation method of the nylon core-spun yarn can be used as a hot-press molding material and is suitable for a plurality of application fields such as clothing, shoes and the like.
The nylon core-spun yarn is manufactured by the preparation method, the performance of the nylon yarn can be effectively reserved by using the nylon core-spun yarn manufactured by the preparation method, the defects of the nylon core-spun yarn are improved by using the performance of the skin material, the nylon core-spun yarn has good cost performance, and the application range of the nylon core-spun yarn is expanded.
Example 1
Slicing TPUTPU 9180AL is put into a drying cylinder for drying; slicing the dried TPU>TPU 9180AL is fed into a twin-screw extruder and heated to 135 ℃ for melt extrusion, and meanwhile, nylon yarn 150D is subjected to +.>PA11 was drawn onto the extruder die at a rate of 150m/min and the TPU was sliced +.>TPU 9180AL is heated and melted and then coated on nylon yarn 150D>Preparing core spun yarns on the surface of the PA 11; and (3) cooling the prepared core spun yarn in a cooling water tank at the temperature of 5 ℃ and then drafting to obtain the core spun yarn.
Example two
Example two is based on example one, except that in this example the skin material is cut from TPEE and the core layer is nylon yarn 150DPA66, melting temperature 133℃and traction speed 300m/min.
Drying the TPEE chip Huafon Terrafon H-3035 in a drying cylinder; putting the dried TPEE slices Huafon Terrafon H-3035 into a double-screw extruder, heating to 133 ℃ for melt extrusion, and simultaneously putting the nylon yarn 150DPA66 is pulled to an extruder die at a speed of 300m/min, and TPEE slices Huafon Terrafon H-3035 are heated and melted and then coated on nylon yarn 150D->Preparing core spun yarns on the surface of the PA 66; and (3) cooling the prepared core spun yarn in a cooling water tank at the temperature of 5 ℃ and then drafting to obtain the core spun yarn.
Example III
Embodiment three is based on embodiment one, except that in this embodiment the sheath material is co-polymerized nylon chips, the core layer is nylon yarn 150d cathiay pa56, the melting temperature is 160 ℃, the traction speed is 200m/min, and the cooling temperature in the cold water tank is 0 ℃.
Slicing the copolymer nylonDrying M995 in a drying cylinder; slicing the dried nylonFeeding M995 into a double-screw extruder, heating to 160 ℃ for melt extrusion, simultaneously drawing 150D Cathay PA56 nylon yarn onto an extruder die at a speed of 200M/min, and slicing the copolymer nylon>Heating and melting M995, and coating on the surface of the nylon yarn 150D Cathay PA56 to prepare core spun yarn; and (3) cooling the prepared core spun yarn in a cold water tank at 0 ℃ and then drafting to obtain the core spun yarn.
Example IV
Embodiment four is based on embodiment one, except that in this embodiment the sheath material is a modified polyester chip and the core layer is nylon yarn Evonik PA12 with a melt temperature of 160 ℃.
Slicing modified polyesterDrying M995 in a drying cylinder; slicing the dried modified polyesterM995 is put into a double screw extruder and heated to 160 ℃ for melt extrusion, and the same asWhen the nylon yarn Evonik PA12 is pulled to an extruder die at the speed of 150m/min, the modified polyester chips are cut into pieces->Heating and melting M995, and coating the nylon yarn Evonik PA12 surface to prepare core-spun yarn; and (3) cooling the prepared core spun yarn in a cooling water tank at the temperature of 5 ℃ and then drafting to obtain the core spun yarn.
Example five
Example five is based on example one, except that in this example the skin layer material was a low melting polyester chip and the core layer was nylon yarn Evonik PA12 with a melting temperature of 150 ℃.
Dupont 3301PTT slice and PBT slice S650FR at 2:1, putting the mixed low-melting-point polyester chips in the proportion into a drying cylinder for drying; putting the dried low-melting-point polyester slices into a double-screw extruder, heating to 150 ℃ for melt extrusion, and simultaneously putting the nylon yarn into 150DDrawing PA66 to an extruder die at a speed of 150m/min, heating and melting the low-melting polyester chip, and coating the low-melting polyester chip on nylon yarn 150D->Preparing core spun yarns on the surface of the PA 66; and (3) cooling the prepared core spun yarn in a cooling water tank at the temperature of 5 ℃ and then drafting to obtain the core spun yarn.
Performance tests were performed on the nylon core-spun yarn prepared in the above examples, and the test results are shown in table 1:
table 1 results of performance tests for example one, example two, example three, example four and example five
| Product(s) | Specification of specification | Density of | Breaking strength | Elongation at break |
| Example 1 | 700D | 1.12g/cm3 | 4.5Cn/dtex | 23.5％ |
| Example two | 300D | 1.15g/cm3 | 5.2Cn/dtex | 21.5％ |
| Example III | 500D | 1.09g/cm3 | 6.5Cn/dtex | 22.3％ |
| Example IV | 600D | 1.21g/cm3 | 4.7Cn/dtex | 20.3％ |
| Example five | 600D | 1.20g/cm3 | 4.3Cn/dtex | 20.5％ |
Note that the data in Table 1 are those obtained according to the national standard test method.
As can be seen from table 1, the nylon core-spun yarns of the first, second, third, fourth and fifth embodiments all have sufficient strength to meet the requirements for manufacturing the hot-press molding materials.
The foregoing description of the embodiments and description is presented to illustrate the scope of the invention, but is not to be construed as limiting the scope of the invention. Modifications, equivalents, and other improvements to the embodiments of the invention or portions of the features disclosed herein, as may occur to persons skilled in the art upon use of the invention or the teachings of the embodiments, are intended to be included within the scope of the invention, as may be desired by persons skilled in the art from a logical analysis, reasoning, or limited testing, in combination with the common general knowledge and/or knowledge of the prior art.
Claims (9)
1. The preparation method of the nylon core-spun yarn is characterized by comprising the following steps:
heating and melting the dried skin material, and coating the skin material on the surface of the nylon yarn to prepare a core-spun material; cooling the core-spun material and then drafting to obtain a core-spun yarn;
wherein the core layer is the nylon yarn and is one or more of aliphatic PA, aliphatic-aromatic PA and aromatic PA; the skin layer material is one of TPU, TPEE, nylon and polyester, the melting point selection range is 100-240 ℃, and the melt index under the melting point is more than 15g/10min.
2. The method of claim 1, wherein the mass ratio of the sheath material to the nylon yarn in the core-spun yarn is 1:0.2-3.
3. The method for preparing a nylon core-spun yarn of claim 1 wherein said nylon yarn may incorporate one or more of antimicrobial, uv and aging resistant functional adjuvants and said nylon yarn may incorporate a color master for color matching.
4. The method of claim 3, wherein the nylon yarn is a monofilament or multifilament yarn, and is blended with one or more of polyester, aramid, ultra-high molecular weight polyethylene, polyimide, carbon fiber, spandex and LCP yarns, and the yarns are wound or woven on the outer layer of the nylon yarn.
5. The method of claim 1, wherein the sheath material is added with one or more functional additives selected from the group consisting of antimicrobial, anti-ultraviolet, flame retardant and anti-yellowing agents, and the sheath material is added with a color master for color matching.
6. The method of claim 1, wherein the sheath material is melted by a twin screw extruder, the twin screw extruder has a set temperature ranging from 110 ℃ to 269 ℃, and the set temperature is 0 ℃ to 20 ℃ higher than the melting point of the sheath material.
7. The method for preparing the nylon core-spun yarn of claim 6, wherein the nylon yarn is drawn onto a double screw extruder die when the sheath material is heated and melted and extruded, the sheath material is coated on the surface of the nylon yarn after being heated and melted, and the drawing speed of the nylon yarn when the nylon yarn is coated by the sheath material is 50m/min-500m/min.
8. The method of claim 7, wherein the cooling of the core-spun yarn is performed by using a cold water tank, and the temperature of the cold water tank is in the range of 0 ℃ to 15 ℃.
9. A nylon core-spun yarn, characterized in that it is manufactured by a method for manufacturing a nylon core-spun yarn according to any one of claims 1 to 8.
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