Lightweight cut-resistant four-dimensional structure fabric based on high-performance composite fibers and preparation method thereof

Abstract

The invention belongs to the technical field of personal protection equipment, and particularly relates to a lightweight cut-resistant four-dimensional structure fabric based on high-performance composite fibers and a preparation method of the lightweight cut-resistant four-dimensional structure fabric. The structure is based on a high-performance composite fiber material and a nano silicon carbide embedding technology of high-performance polyethylene fibers, the hardness bottleneck of a single material is broken through, and multi-fiber compatibility is improved through cooperation of polyurethane fiber surface activation and polyurethane fiber anti-melting modification. The gradient twist core sheath yarn is a high-performance composite yarn, and the strength and the flexibility are balanced. In the aspect of the oversleeve fabric structure, a three-dimensional protection system comprising a honeycomb structure, a silica gel liner and a skin-friendly inner layer is adopted, so that the integration of multiple functions of hydrophobicity, fusion resistance and buffering of a light-weight cut-resistant material is realized. Under the EN 388 standard, 5-level cutting prevention can be achieved, a single high-performance polyethylene fiber cutting prevention oversleeve can only reach 3-4 levels, the weight of the composite fiber material is reduced by 40% compared with that of a full aramid fiber oversleeve, the thickness is reduced by 25%, and the composite fiber material can be suitable for complex scenes such as petroleum and electric power.

Description

Technical Field

[0001] The present invention belongs to the technical field of personal protective equipment, and specifically relates to a lightweight, cut-resistant four-dimensional structural fabric based on high-performance composite fibers and a preparation method thereof. Background Art

[0002] The weight of traditional cut-resistant materials such as full steel wire braid and high-density aramid is usually greater than 500g / m 2 , wearing it for a long time can easily lead to fatigue and limit operational flexibility; traditional materials need to sacrifice breathability and flexibility to achieve a high level of cut resistance, and there is a contradiction between protection and comfort. Cut-resistant materials prepared from single fibers have obvious performance defects. For example, fiber products using a single ultra-high molecular weight polyethylene have insufficient wear resistance and are prone to delamination after long-term use; single polyamide fibers are prone to brittle fracture under dynamic cutting impact due to the rigid arrangement of molecular chains, and their high modulus makes the fibers stiff. In order to achieve a certain level of cut resistance, high-density weaving is required, which affects the breathability of the fabric. Therefore, through the composite design of fiber materials and the integrated design of structural functions, the protective performance of cut-resistant materials can be significantly improved, while taking into account wearing comfort and economy. When preparing cut-resistant materials by composite of multiple materials, the low bonding strength of the multi-fiber interface causes the yarn to break easily, and it is difficult to strike a balance between cut-resistant performance and wearing comfort, which remains a technical difficulty. Summary of the Invention

[0003] In response to the technical problems existing in the preparation of the above-mentioned existing cut-resistant sleeves, the present invention provides a lightweight cut-resistant four-dimensional structural fabric based on high-performance composite fibers and a preparation method thereof, including fiber surface modification, multi-component gradient blending technology and multi-layer composite knitted structure design.

[0004] The technical solutions adopted in the present invention are as follows:

[0005] The lightweight, cut-resistant four-dimensional structural fabric based on high-performance composite fibers includes an inner layer, a middle layer and a surface layer. The inner layer is a plain weft needle structure, the middle layer is a microcapsule weft knitted padding structure, and the surface layer is a high-performance fiber composite yarn knitted jacquard structure.

[0006] The inner layer weft plain needle structure is composed of a composite of skin-friendly natural fibers and elastic yarns. The inner layer yarns and the surface layer yarns are interwoven to form a stable basic support layer.

[0007] The intermediate layer microcapsule weft-knitted cushioning structure is constructed from a blended yarn of high-performance polyamide fiber and polyurethane. This blended yarn forms a polyamide and polyurethane composite yarn, exhibiting excellent strength and impact resistance. The intermediate layer is embedded with silica gel particles, which undergo a heat-melt treatment to enhance adhesion between the inner and outer layers. These particles are then joined to the jacquard knitted structure of the outer layer's high-performance fiber composite yarn and the plain weft stitch structure of the inner layer, achieving a secure bond between the layers.

[0008] The high-performance fiber composite yarn knitted jacquard structure is composed of high-performance composite yarns. The high-performance composite yarns constitute a jacquard structure, increase the effective high-performance composite yarn length for anti-cutting and puncture protection, and disperse the stress of the material when it is cut and punctured, thereby forming an outer layer with good appearance and wear resistance.

[0009] As a preferred solution of the present invention, the polyamide and polyurethane composite yarns in the microcapsule weft-knitted liner structure of the intermediate layer are arranged in an interval manner to form an interwoven connection with the weft plain needle structure of the inner layer.

[0010] Among them, the surface high-performance fiber composite yarn knitted jacquard structure has an overlapping high-performance composite yarn structure, that is, a coil structure overlaps in the thickness direction of the fabric, and forms a certain convex structure on the surface of the fabric, which increases the probability of contact with external sharp objects and improves the anti-cutting performance. It also forms a stable connection point between the two adjacent coils and the single high-performance composite yarn. In addition, it forms a stable connection between the middle layer and the inner layer, thereby enhancing the bonding strength and dimensional stability between the middle structure and the inner layer structure.

[0011] As a preferred solution of the present invention, the yarns in the inner layer weft plain needle structure and the lining yarns in the middle layer microcapsule weft knitted lining structure are interwoven in a relative arrangement to form structural junctions at the interweaving points to enhance the bonding strength between the middle structure and the inner layer structure.

[0012] As another preferred embodiment of the present invention, the loop-forming and loop-collecting structures in the same row of the surface layer are arranged at fixed intervals, wherein the loop-forming yarn coil column is pulled toward the surface layer of the fabric body once for every other coil, and the loop arc of the loop-forming yarn is interwoven and connected with the inner layer structure.

[0013] The loops of the loop-forming yarn pulled to the surface layer are interwoven with the middle layer in the transverse direction, and form an interwoven junction point with one of the inner warp yarns between two adjacent surface loop-forming yarns, thereby effectively improving the structural stability and composite firmness between the middle layer and the surface layer.

[0014] The preparation method of lightweight cut-resistant sleeves based on high-performance composite fibers comprises the following steps:

[0015] Step 1: Preparation and modification of high-performance fiber raw materials

[0016] Preparation of reinforced modified polyethylene fibers

[0017] Using supercritical CO2-assisted dispersion technology, nano-silicon carbide is embedded in high-performance polyethylene spinning solution at a ratio of 1-3wt%;

[0018] Using gel spinning technology and multi-stage heat stretching at 130-150℃ to enhance molecular chain orientation;

[0019] The fiber has a molecular weight of more than 8 million g / mol, a crystallinity of 80-90%, a tensile strength of 40-50 cN / dtex, a modulus of over 1500 GPa, and a density of 0.97 g / cm 3 the following.

[0020] Preparation of Molecular Chain Reinforced and Surface Modified Polyamide Fiber

[0021] Using dry-jet wet spinning process, 1-3% of nano-silicon dioxide or silicon carbide particles with a particle size of 50-100nm are added to the spinning solution;

[0022] After stretching more than 6 times, the molecular chain orientation and crystallinity are improved, the fiber strength is more than 25cN / dtex, and the initial modulus exceeds 80GPa;

[0023] The surface is treated with oxygen plasma at 80-120W for 2-5 minutes and coated with 0.5-1% silane coupling agent to increase the fiber-resin bonding strength by more than 40%;

[0024] In the end, the Martindale wear times exceeded 25,000 times.

[0025] Preparation of cut-resistant modified polyurethane fibers

[0026] Adding 2-5% polytetrafluoroethylene powder to the spandex spinning solution can improve surface lubricity and reduce frictional heat generation.

[0027] Step 2: High-performance composite yarn construction

[0028] The core-sheath structure composite yarn is prepared by gradient blending and ring spinning technology, as follows:

[0029] High-performance polyethylene filaments and pre-drawn polyurethane filaments are fed in parallel through a hollow spindle, with the polyurethane drawing ratio being 3.0 to 3.5 times;

[0030] The polyamide fiber is spirally wrapped around the core yarn with a gradient twist in the twisting triangle area;

[0031] Control the spindle speed to 8000-12000rpm and adjust the wire ring quality to make the coating tight and uniform;

[0032] Simultaneously spraying a water-based polyurethane resin with a solid content of 20-30% to form a micron-level protective film to improve wear resistance;

[0033] The obtained yarn has a comprehensive strength of more than 35cN / tex and has high strength and pre-spinnability.

[0034] Step 3: Four-dimensional knitted structure sleeve forming

[0035] The multi-layer knitted structure is designed to construct a composite sleeve with cut-resistant, cushioning and skin-friendly functions:

[0036] 3.1 Outer layer

[0037] Using the high-performance composite yarn obtained in the second step, knit a honeycomb jacquard structure with a transverse density of 50-60 needles / 5cm;

[0038] The appearance is a closed polygonal mesh structure, forming the first line of defense against cutting.

[0039] 3.2 Middle Layer

[0040] Polyamide and polyurethane blended yarn woven weft knitted cushioning tissue;

[0041] 0.1-0.3mm diameter silica gel particles are embedded in the tissue gaps to enhance the impact-absorbing performance.

[0042] 3.3 Inner layer

[0043] Using polyurethane and cotton core-spun yarn, knitting single jersey stitch;

[0044] Ensure the inner layer is comfortable, soft and breathable.

[0045] Step 4: Hot pressing composite one-piece molding

[0046] The three-layer knitted fabric is integrated by hot pressing, with the temperature controlled at 120-130℃ and the pressure controlled at 0.5-1MPa;

[0047] Each layer is bonded by TPU hot melt adhesive film to improve the overall structural stability and flexibility;

[0048] The composite structure has high molding consistency, meeting the needs of mass production.

[0049] Step 5: Functional finishing

[0050] Spraying a fluorinated silane super-hydrophobic coating on the outer surface;

[0051] The coating forms a nano-scale rough interface structure with a water contact angle of more than 150°, and has excellent liquid impermeability; it prevents the penetration of oil, water, blood, etc., effectively improving the protective performance.

[0052] The beneficial effects of the present invention are as follows:

[0053] The structure of the present invention is based on high-performance composite fiber materials and nano-silicon carbide embedding technology of high-performance polyethylene fibers, breaking through the bottleneck of single material hardness. The surface activation of polyurethane fibers and the anti-melting modification of polyurethane fibers synergistically improve the compatibility of multiple fibers. The gradient twist core-sheath yarn design is a high-performance composite yarn that balances strength and flexibility. In terms of the sleeve fabric structure, a three-dimensional protection system of honeycomb tissue + silicone liner + skin-friendly inner layer is adopted to achieve the hydrophobic, anti-melting and buffering multifunctional integration of lightweight cut-resistant materials. It reaches level 5 cut resistance under the EN 388 standard, while a single high-performance polyethylene fiber cut-resistant sleeve can only reach level 3-4. The composite fiber material is 40% lighter and 25% thicker than a full-aramid sleeve, making it suitable for complex scenarios such as oil and electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a diagram of the structure of the anti-cut sleeve.

[0055] In the figure, 1-high-performance composite yarn; 2-polyamide and polyurethane blended yarn; 3-polyurethane and cotton core-spun yarn. DETAILED DESCRIPTION

[0056] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0057] Example 1:

[0058] The lightweight, cut-resistant four-dimensional structural fabric based on high-performance composite fibers includes an inner layer, a middle layer and a surface layer. The inner layer is a plain weft needle structure, the middle layer is a microcapsule weft knitted padding structure, and the surface layer is a high-performance fiber composite yarn knitted jacquard structure.

[0059] The inner layer weft plain needle structure is composed of a composite of skin-friendly natural fibers and elastic yarns. The inner layer yarns and the surface layer yarns are interwoven to form a stable basic support layer.

[0060] The intermediate layer microcapsule weft-knitted cushioning structure is a weft-knitted cushioning structure composed of a polyamide high-performance fiber and polyurethane blended yarn. This blended yarn forms a polyamide and polyurethane composite yarn 2, exhibiting excellent strength and impact resistance. The intermediate layer is embedded with silica gel particles, which undergo a heat-melt treatment to enhance adhesion between the inner and outer layers. These particles are then joined to the jacquard knitted structure of the outer layer's high-performance fiber composite yarn and the plain weft stitch structure of the inner layer, achieving a secure bond between the layers.

[0061] The high-performance fiber composite yarn knitted jacquard structure is composed of high-performance composite yarn 1, and the high-performance composite yarn 1 constitutes a jacquard structure, which increases the effective length of the high-performance composite yarn 1 for anti-cutting and puncture protection, disperses the stress when the material is cut and punctured, and thus forms an outer layer with good appearance and wear resistance.

[0062] The polyamide and polyurethane composite yarns 2 in the microcapsule weft-knitted liner structure of the intermediate layer are arranged in an interval manner and are interwoven with the weft plain needle structure of the inner layer.

[0063] Among them, the surface high-performance fiber composite yarn knitted jacquard structure has an overlapping high-performance composite yarn structure, that is, a coil structure overlaps in the thickness direction of the fabric, and forms a certain protrusion structure on the surface of the fabric, which increases the probability of contact with external sharp objects and improves the anti-cutting performance. A stable connection point is formed between the two adjacent coils and the single high-performance composite yarn 1. In addition, a stable connection is formed between the middle layer and the inner layer, thereby enhancing the bonding strength and dimensional stability between the middle structure and the inner layer structure.

[0064] The yarns in the inner layer weft plain needle structure and the lining yarns in the middle layer microcapsule weft knitted lining structure are interwoven in a relative arrangement, forming structural junctions at the interweaving locations to enhance the bonding strength between the middle structure and the inner layer structure.

[0065] The looping and tucking structures in the same row of the surface layer are arranged at fixed intervals. For every other loop, the looping yarn column is pulled toward the surface of the fabric body, and the loops of the looping yarn are interwoven with the inner layer structure.

[0066] The loops of the loop-forming yarn pulled to the surface layer are interwoven with the middle layer in the transverse direction, and form an interwoven junction point with one of the inner warp yarns between two adjacent surface loop-forming yarns, thereby effectively improving the structural stability and composite firmness between the middle layer and the surface layer.

[0067] Example 2:

[0068] A method for preparing lightweight, high-performance composite fiber cut-resistant sleeves.

[0069] Here are the steps:

[0070] Step 1: Preparation and modification of high-performance fiber raw materials

[0071] 1.1 Preparation of reinforced modified polyethylene fibers

[0072] Using supercritical CO2-assisted dispersion technology, nano-silicon carbide with a particle size of 50nm is embedded in the high-performance polyethylene spinning solution at a ratio of 2wt%.

[0073] The gel spinning process is used, and multi-stage heat stretching is performed at 150°C with a stretching ratio of 55 times to enhance the molecular chain orientation;

[0074] The fiber has a molecular weight of 8.3 million g / mol, a crystallinity of 90%, a tensile strength of 50 cN / dtex, a modulus exceeding 1600 GPa, and a density of 0.92 g / cm 3 the following.

[0075] 1.2 Preparation of molecular chain reinforced and surface modified polyamide fibers

[0076] Using dry-jet wet spinning process, 3% nano-silicon dioxide or silicon carbide particles with a particle size of 50nm are added to the spinning solution;

[0077] After stretching more than 7 times, the molecular chain orientation and crystallinity are improved, the fiber strength is above 28cN / dtex, and the initial modulus reaches 90GPa;

[0078] The surface was treated with oxygen plasma at 100W for 3 minutes and coated with 1% silane coupling agent to increase the fiber-resin bonding strength by 40%;

[0079] In the end, the Martindale wear times exceeded 25,800 times.

[0080] 1.3 Preparation of cut-resistant modified polyurethane fibers

[0081] Adding 3% polytetrafluoroethylene powder to the spandex spinning solution can improve surface lubricity and reduce frictional heat generation.

[0082] Step 2: High-performance composite yarn construction

[0083] The core-sheath structure composite yarn is prepared by gradient blending and ring spinning technology, as follows:

[0084] High-performance polyethylene filaments (50% by mass) and pre-drawn polyurethane filaments (10% by mass) are fed in parallel through a hollow spindle, with the polyurethane drawing ratio being 3.5 times;

[0085] Polyamide fiber (40% by mass) is spirally wrapped around the core yarn with a gradient twist in the twisting triangle area;

[0086] Control the spindle speed to 10000rpm and adjust the wire ring quality to make the coating tight and uniform;

[0087] Simultaneously spraying a water-based polyurethane resin with a solid content of 25% to form a micron-level protective film to improve wear resistance;

[0088] The resulting yarn has a comprehensive strength of 42cN / tex and is both high-strength and pre-spinnable.

[0089] Step 3: Four-dimensional knitted structure sleeve forming

[0090] The multi-layer knitted structure is designed to construct a composite sleeve with cut-resistant, cushioning and skin-friendly functions:

[0091] (1) Outer layer

[0092] Using the composite yarn obtained in the second step, knit a honeycomb jacquard structure with a transverse density of 55 stitches / 5cm;

[0093] The appearance is a closed polygonal mesh structure, forming the first line of defense against cutting.

[0094] (2) Middle layer

[0095] Polyamide and polyurethane blended yarn 2 woven weft knitted cushioning tissue;

[0096] 0.2mm diameter silica gel particles are embedded in the tissue gaps to enhance impact cushioning performance.

[0097] (3) Inner layer

[0098] Polyurethane and cotton core-spun yarn 3 is used to knit a single jersey stitch;

[0099] Ensure the inner layer is comfortable, soft and breathable.

[0100] Step 4: Hot pressing composite one-piece molding

[0101] The three-layer knitted fabric is integrated by hot pressing, with the temperature controlled at 125℃ and the pressure controlled at 0.8MPa;

[0102] Each layer is bonded by TPU hot melt adhesive film to improve the overall structural stability and flexibility;

[0103] The composite structure has high molding consistency, meeting the needs of mass production.

[0104] Step 5: Functional finishing

[0105] Spraying a fluorinated silane super-hydrophobic coating on the outer surface;

[0106] The coating forms a nano-scale rough interface structure, with a water contact angle of 160°, demonstrating excellent liquid impermeability.

[0107] Prevent the penetration of oil, water, blood, etc., and effectively improve the protective performance.

[0108] Step 6: Fabric performance test

[0109] The fabric was tested according to EN 388:2016 Personal Protective Equipment - Gloves for Protection against Mechanical Risks. The test results are as follows:

[0110] Cut resistance level Cutting Index 5 25

[0111] According to the ASTM D737 standard test method for air permeability of textiles, the air permeability reaches 450L / m2 / s. According to the ASTM D4032 standard test method for determining the stiffness of fabrics by circular bending method, the bending stiffness result is 3.2N·cm. In addition, the fabric weight is 420g / m 2 , the overall effect is light, thin and anti-cutting.

Claims

1. A lightweight, cut-resistant four-dimensional structural fabric based on high-performance composite fibers, characterized in that: It includes an inner layer, a middle layer and a surface layer. The inner layer is a weft plain needle structure, the middle layer is a microcapsule weft knitted lining structure, and the surface layer is a high-performance fiber composite yarn knitted jacquard structure. The inner layer weft plain needle structure is composed of skin-friendly natural fibers and elastic yarns. The inner layer yarns and the surface layer yarns are interwoven to form a stable basic support layer. The intermediate layer microcapsule weft-knitted padding structure adopts a weft-knitted padding structure, which is composed of polyamide high-performance fiber and polyurethane blended yarn, and the polyamide high-performance fiber and polyurethane blended yarn constitute polyamide and polyurethane composite yarn (2); the intermediate layer is embedded with silica gel particles, and the adhesion between the inner layer and the surface layer is enhanced by hot-melt treatment, and the intermediate layer is respectively connected with the surface layer high-performance fiber composite yarn knitted jacquard structure and the inner layer weft plain needle structure to achieve a firm composite between the layers; The high-performance fiber composite yarn knitted jacquard structure is composed of high-performance composite yarn (1), and the high-performance composite yarn (1) constitutes a jacquard weave structure; The high-performance composite yarn (1) is prepared by gradient blending and ring spinning technology to form a core-sheath structure composite yarn, as follows: High-performance polyethylene filaments and pre-drawn polyurethane filaments are fed in parallel through a hollow spindle, with the high-performance polyethylene filaments accounting for 40-60% by weight and the pre-drawn polyurethane filaments accounting for 10-20% by weight; the polyurethane draft ratio is 3.0-3.5 times; Polyamide fiber is spirally wrapped around the core yarn with a gradient twist in the twisting triangle area, with the polyamide fiber accounting for 40-60% of the mass. The spindle speed is controlled at 8000-12000rpm, and the quality of the wire ring is adjusted to ensure a tight and uniform covering layer. Simultaneously spray water-based polyurethane resin with a solid content of 20-30% to form a micron-level protective film to improve wear resistance.

2. The lightweight cut-resistant four-dimensional structural fabric based on high-performance composite fibers according to claim 1, characterized in that: The polyamide and polyurethane composite yarns (2) in the middle layer microcapsule weft-knitted pad structure are arranged in an interval manner to form an interwoven connection with the inner layer weft plain needle structure.

3. The lightweight cut-resistant four-dimensional structural fabric based on high-performance composite fibers according to claim 1, characterized in that: The surface layer high-performance fiber composite yarn knitted jacquard structure has an overlapping high-performance composite yarn structure, that is, a coil structure overlaps in the thickness direction of the fabric, and forms a certain convex structure on the surface of the fabric, and forms a stable connection point with a single high-performance composite yarn (1) between two adjacent coils, and also forms a stable connection between the middle layer and the inner layer.

4. The lightweight cut-resistant four-dimensional structural fabric based on high-performance composite fibers according to claim 1, characterized in that: The yarns in the inner layer weft plain needle structure and the lining yarns in the middle layer microcapsule weft knitted lining structure are interwoven in a relative arrangement, forming structural junctions at the interweaving locations to enhance the bonding strength between the middle structure and the inner layer structure.

5. The lightweight cut-resistant four-dimensional structural fabric based on high-performance composite fibers according to claim 1, characterized in that: The loop-forming and tucking structures in the same row of the surface layer are arranged at fixed intervals, wherein the loop-forming yarn coil is pulled toward the surface layer of the fabric body once for every other coil, and the loop of the loop yarn is interwoven with the inner layer structure, the loop of the loop yarn pulled to the surface layer is interwoven with the middle layer in the transverse direction, and forms an interwoven node between two adjacent surface loop yarns and one of the inner warp yarns.

6. The method for preparing a lightweight cut-resistant sleeve based on high-performance composite fiber according to any one of claims 1 to 5, characterized in that: Here are the steps: Step 1: Preparation and modification of high-performance fiber raw materials 1.1 Preparation of reinforced modified polyethylene fibers Using supercritical CO2-assisted dispersion technology, nano-silicon carbide is embedded in high-performance polyethylene spinning solution at a ratio of 1-3wt%, and the nano-silicon carbide particle size is 50-100nm; Using gel spinning technology, and multi-stage heat stretching at 130-150℃, with a stretching ratio of more than 50 times, to enhance the molecular chain orientation; The fiber has a molecular weight of more than 8 million g / mol, a crystallinity of 80-90%, a tensile strength of 40-50 cN / dtex, a modulus of over 1500 GPa, and a density of 0.97 g / cm 3 the following; 1.2 Preparation of molecular chain reinforced and surface modified polyamide fibers Using dry-jet wet spinning process, 1-3% of nano-silicon dioxide or silicon carbide particles with a particle size of 50-100nm are added to the spinning solution; After stretching more than 6 times, the molecular chain orientation and crystallinity are improved, the fiber strength is more than 25cN / dtex, and the initial modulus exceeds 80GPa; The surface is treated with oxygen plasma at 80-120W for 2-5 minutes and coated with 0.5-1% silane coupling agent to increase the fiber-resin bonding strength by more than 40%; The final Martindale wear times exceeded 25,000 times; 1.3 Preparation of cut-resistant modified polyurethane fibers Add 2-5% polytetrafluoroethylene powder to the spandex spinning solution; Step 2: High-performance composite yarn construction The high-performance composite yarn (1) is prepared by gradient blending and ring spinning technology to form a core-sheath structure composite yarn, as follows: High-performance polyethylene filaments and pre-drawn polyurethane filaments are fed in parallel through a hollow spindle, with the high-performance polyethylene filaments accounting for 40-60% by weight and the pre-drawn polyurethane filaments accounting for 10-20% by weight; the polyurethane draft ratio is 3.0-3.5 times; Polyamide fiber is spirally wrapped around the core yarn with a gradient twist in the twisting triangle area, with the polyamide fiber accounting for 40-60% of the mass. The spindle speed is controlled at 8000-12000rpm, and the quality of the wire ring is adjusted to ensure a tight and uniform covering layer. Simultaneously spraying a water-based polyurethane resin with a solid content of 20-30% to form a micron-level protective film to improve wear resistance; Step 3: Four-dimensional knitted structure sleeve forming The multi-layer knitted structure is designed to construct a composite sleeve with cut-resistant, cushioning and skin-friendly functions: 3.1 Outer layer Using the high-performance composite yarn obtained in the second step, knit a honeycomb jacquard structure with a transverse density of 50-60 needles / 5cm; The appearance is a closed polygonal mesh structure, forming the first line of defense against cutting; 3.2 Middle Layer Polyamide and polyurethane blended yarn (2) woven weft-knitted cushioning tissue; 0.1-0.3mm diameter silica gel particles are embedded in the tissue gaps to enhance impact cushioning performance; 3.3 Inner layer Polyurethane and cotton core-spun yarn (3) is used to knit a single jersey stitch; Step 4: Hot pressing composite one-piece molding The three-layer knitted fabric is integrated by hot pressing, with the temperature controlled at 120-130℃ and the pressure controlled at 0.5-1MPa; Each layer is bonded by TPU hot melt adhesive film to improve the overall structural stability and flexibility; Step 5: Functional finishing Spraying a fluorinated silane super-hydrophobic coating on the outer surface; The coating forms a nano-scale rough interface structure with a water contact angle of more than 150°.

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