Nylon corduroy composite thermal fabric and preparation method thereof

Abstract

The invention provides a chinlon corduroy composite warm-keeping fabric and a preparation method thereof.The composite warm-keeping fabric comprises a ground weave located on the front face and a pile weft weave located on the back face, the ground weave is a twill weave, the pile weft weave is fixedly connected to the surface of the ground weave through interlacing of pile weft and ground warp and forms plush through the pile cutting technology, and the pile weft weave is made of chinlon corduroy. The consolidation form is W-shaped and V-shaped, the warp and weft yarns of the ground weave are homogeneous skin-core type superfine denier chinlon 6 yarns and have wear-resistant and windproof functions, and the yarns of the pile weft weave are heat reflection cotton-based blended yarns and have skin-friendly and warm-keeping functions. The skin-core structure of the yarn and the superfine fibers improve the capturing and maintaining capacity for still air, external heat recovery is achieved through the heat reflection cotton-based blended yarn, and the heat preservation performance of the composite fabric is improved through the synergistic effect of the skin-core structure and the superfine fibers.

Description

Technical Field

[0001] This invention relates to the field of composite fabrics, specifically to a nylon corduroy composite thermal insulation fabric and its preparation method. Background Technology

[0002] With the improvement of people's living standards and the change of consumption concepts, higher requirements are placed on the functionality, comfort, and durability of winter clothing fabrics. Warmth, as one of the core performance characteristics of winter fabrics, directly affects the wearing experience. Currently, most common warm fabrics on the market use heavy natural fibers such as cotton and wool, or add chemical warming fibers to improve warmth. These fabrics generally have drawbacks such as being heavy and having poor moisture absorption and wicking properties. Corduroy fabric, due to its unique pile structure, is widely used in winter clothing because of its soft touch and certain warmth. However, traditional corduroy is mostly made of cotton fiber, which has problems such as being prone to pilling, poor abrasion resistance, and insufficient warmth retention. Furthermore, relying solely on the air layer between the pile ribs for warmth is insufficient to meet the warmth requirements in extremely cold environments. To improve the warmth retention of fabrics, composite fabric structures are often used. These combine fibers or yarns with different functions to achieve integrated warmth retention, windproofing, and breathability. However, the warmth retention mechanism still relies primarily on the heat storage of the fibers themselves and the insulation of air layers, lacking active heat reflection capabilities. Heat is easily lost through the fabric, resulting in limited warmth retention efficiency. Microfibers, due to their large specific surface area and good bulkiness, can form more static air layers, contributing to improved warmth retention. However, their manufacturing process is complex, especially for core-sheath composite microfibers, where controlling the spinning parameters is difficult, leading to uneven core-sheath layer distribution and insufficient fiber strength. Furthermore, the weft-pile bonding method in corduroy fabrics directly affects the stability of the pile and the fabric's appearance and texture. A single bonding method can easily lead to pile shedding and pile deformation after repeated wear and washing, affecting the fabric's lifespan and warmth retention.

[0003] Therefore, there is an urgent need to develop a composite thermal insulation fabric with a reasonable structure, synergistic materials, and excellent heat insulation and heat reflection properties to meet the application needs of functional fabrics for high performance and multiple scenarios. Summary of the Invention

[0004] The technical problem to be solved: The purpose of this invention is to provide a nylon corduroy composite thermal insulation fabric and its preparation method. By introducing ultrafine fibers into the core-sheath structure yarn to enhance the ability to capture and retain still air, and by performing heat reflection treatment on the cotton-based blended yarn to form external heat recovery, the thermal insulation performance of the composite fabric is improved.

[0005] Technical solution: A nylon corduroy composite thermal insulation fabric: The composite thermal insulation fabric includes a ground weave on the front and a pile weave on the back, wherein the ground weave is... The fabric is a twill weave, wherein the pile weft and ground warp are interwoven and fixed on the surface of the ground fabric and the pile is formed by a cutting process. The fixing form is W-shaped + V-shaped. The warp and weft yarns of the ground fabric are homogeneous core-sheath type ultra-fine denier nylon 6 yarns, and the yarns of the pile weft are heat-reflective cotton-based blended yarns.

[0006] The above-mentioned method for preparing homogeneous core-sheath type ultrafine denier nylon 6 yarn includes the following steps: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 110-130℃ for 6-12 hours; S12. The dried nylon 6 is melt-spun, and the nylon 6 chips are extruded from the core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.3~0.5mm, the sheath layer has a micropore diameter of 0.05~0.08mm, and the sheath layer has 48~68 pores. The spinneret is cooled, drawn, and solidified by side blowing air to obtain the nascent yarn. S13. Low-twist treatment is applied to 3-4 nascent filaments to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0007] The above-mentioned method for preparing heat-reflective cotton-based blended yarn includes the following steps: S21. Cotton fibers are evenly coated onto the surface of ultrafine nylon core yarn using air-jet spinning; S22. Low-twist twisting treatment is applied to core-spun yarn to obtain cotton-based blended yarn; S23. Prepare a 10-15% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 3-5:1 and dispersing them in the polyurethane binder and stirring evenly to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding. After treatment, it is pre-dried in an oven and heat-set and cured to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0008] The preparation method of the above-mentioned composite thermal insulation fabric includes the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft weave circulates between the ground wefts, and one pile weft is woven in between every two ground wefts. The pile weft is fixed to the surface of the ground weave through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts, thus obtaining the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0009] Preferably, in step S12, the temperature of melt spinning is 230~240℃ in the feeding section, 240~250℃ in the compression section, and 250~260℃ in the spinneret, with a total draw ratio of 1.3~1.5. In step S13, the twist of the low-twist twisting treatment is 80~150T / m, and the twist direction is Z-direction or S-direction single twist.

[0010] Preferably, in step S21, the linear density of the ultrafine nylon core yarn is 40~50D, the number of fiber monofilaments is 84~120f, the yarn specification of the cotton fiber is 40s~60s, and the length is 25~35mm. In step S22, the twist of the low twisting treatment is 60~120T / m, and the twist direction is Z-direction or S-direction single twist.

[0011] Preferably, in step S24, the immersion temperature is 60~80℃, the immersion liquid rate is 60~80%, the oven pre-drying temperature is 80~100℃, the time is 5~10min, and the heat setting and curing temperature is 140~160℃, the time is 2~3min.

[0012] Preferably, the consolidation form is W-shaped with 8-12 long latitude lines, and the consolidation form is V-shaped with 8-12 long latitude lines.

[0013] Preferably, the warp density of the composite thermal insulation fabric is 600-800 threads / 10cm, and the weft density is 650-850 threads / 10cm.

[0014] Beneficial effects: The nylon corduroy composite thermal insulation fabric of the present invention has the following advantages: In this invention, the ground weave on the front side of the fabric uses homogeneous core-sheath type ultrafine denier nylon 6 yarn as warp and weft yarns. The core-sheath structure and low-twist twisting design create heat-releasing channels inside the fibers, enhancing their heat retention capacity. The ultrafine denier structure of the sheath layer significantly increases the fiber's specific surface area and internal air content, which helps to capture still air and suppress heat convection, significantly improving the fabric's heat storage and warmth retention performance. At the same time, nylon 6 itself has excellent breaking strength, abrasion resistance, and flexibility, effectively resisting external mechanical friction and cold wind intrusion, playing a protective role, and is suitable for winter outerwear with high requirements for abrasion resistance, windproof, and protective performance.

[0015] In this invention, the pile weft structure on the reverse side of the fabric adopts a core-spun structure with ultra-fine nylon as the core and cotton fibers as the outer layer. The ultra-fine nylon core has low thermal conductivity, which can effectively store still air and block heat conduction. The low twisting method makes the surface cotton fibers soft and fluffy with strong pile formation. After cutting and untwisting, a large amount of hair is generated, which further improves the ability to capture still air and builds a stable thermal insulation layer. A nano-TiO2 / ZnO composite heat reflective layer is introduced on the surface of the core-spun yarn through impregnation, which can effectively reflect the infrared heat radiation of the human body, reduce the rate of heat loss, and enhance the thermal sealing of the fabric, forming a triple synergistic heat-locking structure of "heat preservation-heat insulation-heat reflection". The surface is covered with cotton fibers, which makes it both soft and skin-friendly and highly efficient insulating when worn close to the skin.

[0016] In this invention, the ground weave of the composite fabric structure adopts The twill weave is soft to the touch, with tightly packed and full yarns. The pile weft is fixed to the fabric surface through W-shaped and V-shaped interlacing, forming a pile after the cut pile treatment. The pile is not only orderly and full with three-dimensional pile strips, but also firmly fixed at the root, making it difficult to fall off. The spacing of the floating pile wefts is reasonable, which is conducive to the fluffy and full pile and improves the heat retention performance. The overall structure of the fabric is compact, with distinct layers and coordinated functional areas, which can meet the requirements of cut pile and brushing finishing processes. The finished fabric has clear stripes and stable pile that is not easy to fall off, with excellent warmth retention and practicality. Attached Figure Description

[0017] Figure 1 This is a physical drawing of the present invention; Figure 2 This is a fabric structure diagram of the present invention, with the arrows indicating the cut pile positions; Figure 3 This is a cross-sectional view of the core-spinning composite spinneret in this invention. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments. These embodiments are illustrative of the present invention, but the present invention is not limited to these embodiments: Example 1

[0019] A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates between the ground weft and the ground weft, one pile weft is woven in between every two ground wefts, the warp density is 800 threads / 10cm and the weft density is 850 threads / 10cm. The pile weft is fixed to the ground weft surface through W-shaped and V-shaped interlacing structures to form regularly arranged floating pile wefts. The W-shaped floating weft threads are 8 ground warps and the V-shaped floating weft threads are 8 ground warps, resulting in the greige fabric; S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0020] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 130℃ for 6 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.3 mm, the sheath layer has a micropore diameter of 0.05 mm, and the sheath layer has 68 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nylon 6 is cooled and solidified by side blowing to obtain nascent yarn. S13. Twist the three nascent yarns at a twist of 80T / m in a single twist direction (Z) to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0021] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 50D / 120f. S22. The core-spun yarn is twisted to a twist of 60T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 10% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 3:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 60°C and a liquid-pickling rate of 80%. After treatment, it is pre-dried in an oven at 100°C for 5 minutes and then heat-set and cured at 160°C for 2 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0022] Example 2

[0023] A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground weft, with one pile weft woven between every two ground wefts. The warp density is 600 threads / 10cm, and the weft density is 650 threads / 10cm. The pile weft is fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating weft threads are 12 ground warp threads, and the V-shaped floating weft threads are 12 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0024] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 110℃ for 12 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.5 mm, the sheath layer has a micropore diameter of 0.08 mm, and the sheath layer has 48 holes. The melt spinning temperature is 240℃ in the feeding section, 250℃ in the compression section, and 260℃ in the spinneret. The total draw ratio is 1.5. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the four nascent yarns at a twist rate of 150T / m with a single twist in the S direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0025] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 60s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 84f. S22. The core-spun yarn is twisted to a twist of 120T / m with a single twist in the S direction to obtain cotton-based blended yarn; S23. Prepare a 15% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 5:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution. S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickling rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 0 min and then heat-set and cured at 140°C for 3 min to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0026] Example 3

[0027] A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0028] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0029] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0030] Example 4

[0031] A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... In twill weaving, the pile weft structure circulates and floats between the ground wefts. One pile weft is woven between every two ground wefts. The warp density is 600 wefts / 10cm, and the weft density is 650 wefts / 10cm. The pile weft is fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating weft has 9 ground warp threads, and the V-shaped floating weft has 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0032] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 130℃ for 6 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.3 mm, the sheath layer has a micropore diameter of 0.05 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist of 80T / m in a single twist direction (Z) to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0033] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 50D / 120f. S22. The core-spun yarn is twisted to a twist of 60T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 10% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 3:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 60°C and a liquid-pickling rate of 80%. After treatment, it is pre-dried in an oven at 100°C for 5 minutes and then heat-set and cured at 160°C for 2 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0034] Example 5

[0035] A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... In twill weaving, the pile weft structure circulates and floats between the ground wefts. One pile weft is woven between every two ground wefts. The warp density is 800 threads / 10cm, and the weft density is 850 threads / 10cm. The pile weft is fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating weft threads are 9 ground warps, and the V-shaped floating weft threads are 11 ground warps, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0036] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 130℃ for 6 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.5 mm, the sheath layer has a micropore diameter of 0.08 mm, and the sheath layer has 48 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist of 80T / m in a single twist direction (Z) to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0037] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 50D / 120f. S22. The core-spun yarn is twisted to a twist of 60T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 10% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 3:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 60°C and a liquid-pickling rate of 80%. After treatment, it is pre-dried in an oven at 100°C for 5 minutes and then heat-set and cured at 160°C for 2 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0038] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that: ordinary nylon 6 yarn is used as the ground structure for the warp and weft yarns; A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Ordinary nylon 6 yarn with a twist of 500T / m is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0039] Among them, the preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0040] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that the weft yarn used is pure cotton yarn without finishing. A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultra-fine denier nylon 6 yarn is used as the ground warp and weft yarns, and pure cotton yarn with a twist of 100T / m is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0041] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0042] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that the cotton-based blended yarn is not subjected to heat-reflective treatment; A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Use homogeneous core-sheath type ultrafine denier nylon 6 yarn as the ground warp and weft yarns, and cotton-based blended yarn as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0043] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0044] Preparation of cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn.

[0045] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that both the homogeneous core-sheath type ultrafine denier nylon 6 yarn and the heat-reflective cotton-based blended yarn are made with high twist. A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0046] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist of 800T / m in a single twist direction (Z) to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0047] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to 800T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0048] Comparative Example 5 The difference between Comparative Example 5 and Example 3 is that the pile weft is only fixed to the surface of the ground fabric through a V-shaped interlacing structure, and the weft float is a single ground warp. A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure rises in a loop between the ground weft, one pile weft is woven in between every two ground wefts, the warp density is 700 threads / 10cm, the weft density is 800 threads / 10cm, the pile weft V-shaped interlacing structure is fixed on the surface of the ground structure, forming regularly arranged floating pile wefts, the floating weft thread is 1 ground warp, and the greige fabric is obtained. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0049] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0050] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0051] Comparative Example 6 The difference between Comparative Example 6 and Example 3 is that the pile weft is only fixed to the surface of the ground fabric through a V-shaped interlacing structure, and the weft float is 16 ground warp threads; A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates between the ground weft, one pile weft is woven between every two ground wefts, the warp density is 700 threads / 10cm, the weft density is 800 threads / 10cm, the pile weft is fixed to the surface of the ground structure through a V-shaped interlacing structure, forming regularly arranged floating pile wefts, the V-shaped weft floating threads are 16 ground warps, resulting in the greige fabric; S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0052] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0053] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0054] Comparative Example 7 The difference between Comparative Example 7 and Example 3 is that 5 pile wefts are woven between every 2 ground wefts; A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground weft, with 5 pile wefts woven between every 2 ground wefts. The warp density is 600 wefts / 10cm and the weft density is 850 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating weft has 9 ground warp threads and the V-shaped floating weft has 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0055] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0056] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0057] Comparative Example 8 The difference between Comparative Example 8 and Example 3 is that only a single homogeneous core-sheath type ultrafine denier nylon 6 filament is twisted; A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0058] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. A single nascent yarn is twisted at a twist rate of 100T / m in the Z-direction to obtain a homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0059] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0060] Comparative Example 9 The difference between Comparative Example 9 and Example 3 is that the 8 filaments are twisted into homogeneous core-sheath type ultrafine denier nylon 6 yarn; A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0061] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist 8 nascent filaments at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0062] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0063] Comparative Example 10 The difference between Comparative Example 10 and Example 3 is that the warp and weft yarns of the ground structure are heat-reflective cotton-based blended yarns, and the yarns of the pile weft structure are homogeneous core-sheath type ultrafine denier nylon 6 yarns. A nylon corduroy composite thermal insulation fabric and its preparation method include the following steps: S1. Heat-reflective cotton-based blended yarn is used as the ground warp and weft yarns, and homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft structure circulates and floats between the ground wefts, with one pile weft woven between every two ground wefts. The warp density is 700 wefts / 10cm and the weft density is 800 wefts / 10cm. The pile wefts are fixed to the surface of the ground structure through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts. The W-shaped floating wefts have 9 ground warp threads and the V-shaped floating wefts have 11 ground warp threads, resulting in the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

[0064] Among them, the preparation of homogeneous core-sheath type ultrafine denier nylon 6 yarn: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 120℃ for 8 hours; S12. The dried nylon 6 is melt-spun. Nylon 6 chips are extruded from a core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.4 mm, the sheath layer has a micropore diameter of 0.06 mm, and the sheath layer has 60 holes. The melt spinning temperature is 230℃ in the feeding section, 240℃ in the compression section, and 250℃ in the spinneret. The total draw ratio is 1.3. The nascent yarn is obtained by side blowing air to cool and solidify the yarn. S13. Twist the three nascent yarns at a twist rate of 100T / m with a single twist in the Z direction to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

[0065] Preparation of heat-reflective cotton-based blended yarn: S21. Using air-jet spinning, cotton fibers with a yarn specification of 40s and a length of 30±5mm are evenly coated on the surface of ultrafine nylon core yarn with a specification of 40D / 96f. S22. The core-spun yarn is twisted to a twist of 100T / m with a single twist in the Z direction to obtain cotton-based blended yarn; S23. Prepare a 12% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 4:1 and dispersing them in the polyurethane binder and stirring until homogeneous to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding at a temperature of 80°C and a liquid-pickup rate of 60%. After treatment, it is pre-dried in an oven at 80°C for 10 minutes and then heat-set and cured at 150°C for 3 minutes to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

[0066] Tests: Clo value test reference standard GB / T 35762-2017 "Test Methods for Thermal Transfer Properties of Textiles - Plate Method"; Temperature rise difference test uses a heating plate to simulate human skin temperature, covering the fabric under test for 10 minutes, and then measures the difference between the outer surface temperature of the fabric and the ambient temperature, referencing standard GB / T 11048-2018 "Determination of Thermal and Moisture Resistance of Textiles under Steady-State Conditions for Physiological Comfort"; Far-infrared reflectance test reference standard GB / T 30127-2013 "Detection and Evaluation of Far-infrared Properties of Textiles"; Anti-pilling grade test reference standard GB / T 4802.2-2008 "Determination of Pilling Properties of Textile Fabrics - Part 2: Modified Martindale Method".

[0067] Table 1. Clo value, temperature rise difference, and thermal reflectance of the weft and pile surfaces of the fabric.

[0068] The homogeneous core-sheath type ultrafine denier nylon 6 yarn used in this invention has a sheath layer composed of ultrafine nylon 6 fibers, possessing a large specific surface area. The heat-reflective cotton-based blended yarn, after being cut into pile, forms a large number of fine, short fibers on the fabric surface. This yarn design enhances the fabric's ability to trap still air, effectively suppressing heat loss caused by air convection and improving overall warmth retention. The softness of cotton fibers enhances the fabric's skin-friendliness. In the ground weave, while the number of filaments in the homogeneous core-sheath type ultrafine denier nylon 6 yarn increases, the warmth retention is not significantly improved. Instead, the fabric becomes heavier, breathability decreases, and overall performance declines. Too few filaments result in larger fabric gaps, reducing warmth retention. The pile weft uses W-shaped and V-shaped fastenings, ensuring pile fluffiness while strengthening the connection between the pile root and the ground. The strong bonding of the fabric structure makes the pile arrangement more three-dimensional and uniform after cutting, further building a stable air insulation layer and improving the thermal resistance of the fabric from a structural level. The introduction of a nano-TiO2 / ZnO heat-reflective coating on the fabric surface has excellent heat reflection performance, reducing heat loss. The overall fabric uses a low-twist yarn structure, which has stronger inter-fiber bulkiness and is conducive to forming more closed still air zones, improving air retention efficiency. A high-twist yarn structure will result in less hair release during fabric cutting, making it unable to retain a large amount of still air. After swapping the ground weft and pile weft yarns, the amount of hair after cutting is less and cannot retain still air. When heat-reflective cotton-based blended yarn is used as the ground weft, the effective heat reflection area is reduced, affecting the warmth retention effect.

[0069] Table 2. Test results of temperature rise difference after anti-pilling and friction pilling of fabrics.

[0070] In this invention, the pile weft structure adopts a W-shaped and V-shaped interlacing binding method, which improves the anchoring effect of the pile weft in the ground weave structure, effectively reducing the displacement and shedding of pile during friction, and keeping the anti-pilling performance of the fabric stable at level 4 or above. Comparative Example 5 only uses a single V-shaped binding structure and has a small number of interlacing points of the pile warp, which makes the pile weft yarn easy to loosen and entangle with adjacent yarns during friction, resulting in obvious pilling. In Comparative Example 6, the weft float is set too long, reducing the binding area of ​​the pile weft in the ground weave structure, making it easier for pile, entanglement and fiber escape to occur during friction, and increasing the tendency to pill. Although Comparative Example 4 improves the binding effect of pile weft by increasing the pile weft length, the negative impact of pile weft on the fabric's anti-pilling performance is still significant. Yarn twist increases yarn strength and surface fiber cohesion, thus improving anti-pilling performance to some extent. However, the reduction in hairiness caused by high twist reduces the fluffiness and thermal resistance structure of the fabric surface, which is not conducive to the performance of warmth retention. In Comparative Example 7, five pile wefts are woven between every two ground wefts. After cutting the pile, a dense pile is formed, but the ground structure is not supported enough, resulting in a loose surface structure that is easy to rub off, thus aggravating the pilling phenomenon. At the same time, it also has an adverse effect on the overall stability and warmth retention performance of the fabric. In Comparative Example 10, the pile weft structure with ultrafine nylon 6 fibers located on the reverse side of the fabric is inferior to the example in terms of its ability to resist external mechanical friction and cold wind attack.

[0071] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A nylon corduroy composite thermal insulation fabric, characterized in that, The composite thermal insulation fabric includes a ground weave on the front and a pile weave on the back, wherein the ground weave is... The fabric is a twill weave, wherein the pile weft and ground warp are interwoven and fixed on the surface of the ground fabric and the pile is formed by a cutting process. The fixing form is W-shaped + V-shaped. The warp and weft yarns of the ground fabric are homogeneous core-sheath type ultra-fine denier nylon 6 yarns, and the yarns of the pile weft are heat-reflective cotton-based blended yarns.

2. The composite thermal insulation fabric according to claim 1, characterized in that: The preparation method of the homogeneous core-sheath type ultrafine denier nylon 6 yarn includes the following steps: S11. Place the nylon 6 chips in a vacuum drying oven and dry them at 110-130℃ for 6-12 hours; S12. The dried nylon 6 is melt-spun, and the nylon 6 chips are extruded from the core-sheath composite spinneret. The core layer of the core-sheath composite spinneret has a central hole diameter of 0.3~0.5mm, the sheath layer has a micropore diameter of 0.05~0.08mm, and the sheath layer has 48~68 pores. The spinneret is cooled, drawn, and solidified by side blowing air to obtain the nascent yarn. S13. Low-twist treatment is applied to 3-4 nascent filaments to obtain homogeneous core-sheath type ultrafine denier nylon 6 yarn.

3. The composite thermal insulation fabric according to claim 1, characterized in that: The preparation method of the heat-reflective cotton-based blended yarn includes the following steps: S21. Cotton fibers are evenly coated onto the surface of ultrafine nylon core yarn using air-jet spinning; S22. Low-twist twisting treatment is applied to core-spun yarn to obtain cotton-based blended yarn; S23. Prepare a 10-15% polyurethane solution by mixing nano-TiO2 and nano-ZnO at a mass ratio of 3-5:1 and dispersing them in the polyurethane binder and stirring evenly to form a coating solution; S24. The cotton-based blended yarn is placed in a coating solution and treated by padding. After treatment, it is pre-dried in an oven and heat-set and cured to form a washable heat-reflective layer, thus obtaining heat-reflective cotton-based blended yarn.

4. The method for preparing the composite thermal insulation fabric according to claim 1, characterized in that, Includes the following steps: S1. Homogeneous core-sheath type ultrafine denier nylon 6 yarn is used as the ground warp and weft yarns, and heat-reflective cotton-based blended yarn is used as the pile weft yarn. The ground warp and weft yarns adopt... Twill weave, the pile weft weave circulates between the ground wefts, and one pile weft is woven in between every two ground wefts. The pile weft is fixed to the surface of the ground weave through W-shaped and V-shaped interlacing structures, forming regularly arranged floating pile wefts, thus obtaining the greige fabric. S2. The finished fabric is cut into pile by longitudinally cutting along the center of the floating long pile weft. The floating weft breaks and flips up to form pile, resulting in corduroy fabric with a three-dimensional pile effect. S3. Brush the cut corduroy fabric to obtain nylon corduroy composite thermal insulation fabric.

5. The composite thermal insulation fabric according to claim 2, characterized in that: In step S12, the temperature of melt spinning is 230~240℃ in the feeding section, 240~250℃ in the compression section, and 250~260℃ in the spinneret. The total draw ratio is 1.3~1.

5. In step S13, the twist of the low twisting treatment is 80~150T / m, and the twist direction is Z-direction or S-direction single twist.

6. The composite thermal insulation fabric according to claim 3, characterized in that: In step S21, the linear density of the ultrafine nylon core yarn is 40~50D, the number of fiber monofilaments is 84~120f, the yarn specification of the cotton fiber is 40s~60s, and the length is 25~35mm. In step S22, the twist of the low twist treatment is 60~120T / m, and the twist direction is Z-direction or S-direction single twist.

7. The composite thermal insulation fabric according to claim 3, characterized in that: In step S24, the immersion temperature is 60~80℃, the immersion liquid rate is 60~80%, the oven pre-drying temperature is 80~100℃, the time is 5~10min, and the heat setting and curing temperature is 140~160℃, the time is 2~3min.

8. The method for preparing the composite thermal insulation fabric according to claim 4, characterized in that: The consolidation form is W-shaped with 8-12 long latitude floats, and the consolidation form is V-shaped with 8-12 long latitude floats.

9. The composite thermal insulation fabric according to claim 1, characterized in that: The composite thermal insulation fabric has a warp density of 600-800 threads / 10cm and a weft density of 650-850 threads / 10cm.

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