High-density warp-conductive net-shaped polyester / cotton functional fabric and finishing method thereof

Abstract

The invention discloses a high-density warp-guiding net-shaped polyester / cotton functional fabric and a finishing method thereof.The fabric adopts a three-up-one-down broken twill weave, the warp density and the weft density are both 28-32 pieces / cm, a warp system is formed by arranging polyester / cotton blended yarn (A) and low-elasticity conductive composite yarn (B) according to the rule of A (M)-B1 pieces (M = 8-69), and a high-density warp-guiding net is formed; the conductive composite yarn can be of a grid-connected structure or a core-sheath wrapping structure. The preparation method comprises the steps of weaving, conventional after-finishing and key trace conductive polymer bridging finishing: padding 1%-5% of PEDOT: PSS solution, and baking at the temperature of 100-120 DEG C to form conductive bridging points at yarn intersections. According to the invention, through the cooperation mechanism of the built-in high-density conductive net and external auxiliary chemical bridging points, the fabric has stable and excellent conductivity and durability while maintaining excellent comfort, and is suitable for the fields of high-end anti-static protective clothing and intelligent textiles.

Description

Technical Field

[0001] This invention relates to the field of functional textile technology, and more specifically to a high-density warp-guided mesh polyester / cotton functional fabric and its finishing method. Background Technology

[0002] In fields such as petrochemicals, electronics, and medical protective equipment, there are strict requirements for the antistatic properties of work clothes. Currently, the mainstream methods for imparting conductivity to fabrics mainly include conductive fiber blending and surface coating and impregnation conductive finishing.

[0003] Conductive fiber blending involves mixing conductive fibers with ordinary fibers during the spinning stage. While this can achieve a relatively uniform volume resistivity distribution, the conductive path is random, resulting in poor warp conductivity stability. Furthermore, the fixed proportion of conductive fibers makes precise control difficult. Surface coating and impregnation conductive finishing methods achieve conductivity by coating or impregnating the fabric surface with conductive coatings (such as silver ions or conductive polymers). Although this significantly reduces surface resistivity, the conductive layer has low adhesion, poor abrasion resistance, and is prone to peeling off. Additionally, the process is complex and costly.

[0004] The aforementioned problems are particularly pronounced for thick twill fabrics. Blending methods require a high proportion of conductive fibers, sacrificing comfort; coating methods are difficult to apply evenly to thick structures and affect the fabric's style. Therefore, developing a technical solution that constructs a stable, low-resistance conductive path during the weaving stage, while simultaneously achieving a significant performance boost through a simplified process, without compromising the fabric's inherent style, has become a pressing technical challenge in this field. Summary of the Invention

[0005] This invention provides a heavy-duty functional fabric with adjustable conductivity, stability, durability, and good comfort, as well as its preparation method. A breakthrough in both conductivity and overall performance is achieved by constructing a synergistic system of an "internal high-density physical conductive network" and "external trace chemical bridging points."

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-density warp-guided electrical grid-like polyester / cotton functional fabric, employing a "three-up-one-down" twill weave, with both warp and weft densities of 28-32 yarns / cm. The warp system of the fabric includes two types of yarns: yarn A is a polyester / cotton blended yarn, and yarn B is a low-elastic conductive composite yarn. The warp yarns are arranged in a repeating unit of "A(M) yarns → B(1) yarns", where M is an integer from 8 to 69. The weft yarn is a polyester / cotton blended yarn.

[0007] Furthermore, the value of M in the loop unit ranges from 18 to 34.

[0008] Furthermore, the conductive component of the low-elasticity conductive composite yarn B is one of metal fiber, metal-plated fiber or carbon fiber, and is more preferably stainless steel fiber or silver fiber.

[0009] Furthermore, the structure of the low-elasticity conductive composite yarn B is either a network structure or a core-sheath covered structure. When it is a core-sheath covered structure, the conductive component serves as the core yarn, which is covered with polyester low-elasticity yarn or ordinary textile fibers.

[0010] Furthermore, when the yarn B has a double-layer structure, its composite twist is controlled within the range of 8-12 twists / 10 cm.

[0011] Furthermore, the yarn B of the interlocking structure is formed by interlocking and twisting 50D / 48F polyester low elastic yarn and 20D / 2F carbon black conductive yarn.

[0012] Furthermore, 30-60 yarns B are provided on each side of the fabric edge as conductive edge yarns to enhance the uniformity of conductivity at the fabric edge.

[0013] A method for preparing the above-mentioned high-density warp-guided mesh polyester / cotton functional fabric includes the following steps: (1) Raw material preparation and weaving: Prepare yarn A, yarn B and weft yarn, and after warping, heddle threading and reed threading, weave the fabric on the loom; warping is carried out according to the warp yarn arrangement rule described above; when threading the heddle, thread all yarn B into the first heddle frame; (2) Conventional finishing: The fabric obtained in step (1) is successively singed, desized and set; (3) Micro-conductive polymer bridging finishing: The fabric treated in step (2) is immersed in an aqueous solution of conductive polymer finishing agent with a concentration of 1%-5%, wherein the conductive polymer finishing agent is PEDOT:PSS; then it is rolled by a rolling mill, and the roll residue rate is controlled to be 40%-60%; finally, it is baked at 100-120℃ for 1-3 minutes.

[0014] Furthermore, in step (3), a penetrant accounting for 2%-5% of the total weight of the conductive polymer finishing agent is added to the aqueous solution of the finishing agent.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A synergistic conductivity mechanism of "internal high-density conductive network + external chemical bridging points" was constructed, which significantly improved conductivity and reduced surface resistance; 2. The conductive mesh is physically embedded, and the bridging points are microscopically anchored. Both have extremely strong abrasion and washability resistance, and the conductivity is long-lasting and stable, with excellent washability and abrasion resistance. 3. By optimizing the distribution density and structure of the conductive yarn, the original softness and breathability of the fabric are maintained while ensuring conductivity. 4. The process is simple and controllable, requiring no complex coating equipment, and meets the requirements of green manufacturing; 5. It has a wide range of applications and can be used in high-end antistatic workwear, special functional home textiles and intelligent textiles. Attached Figure Description

[0016] Figure 1 These are the basic tissue diagrams (including pattern diagrams, heddle diagrams, and tissue diagrams) of the embodiments of the present invention.

[0017] It should be noted that, Figure 1 The diagram shown is a basic cycle diagram of the "three-up-one-down" broken twill weave structure used in this invention. The forward threading method (1, 2, 3, 4) shown in the diagram is the standard threading method for this basic weave structure. In actual production, the warp yarns need to be arranged according to the rule of "A (M) yarns → B (1) yarns". At this time, regardless of the position of the conductive yarn B in the warp yarn sequence, it is uniformly threaded into the first heddle frame during threading, rather than strictly following the forward threading sequence shown in the diagram. This threading method is a key process guarantee to ensure that the conductive yarn B forms a continuous and stable warp-guided electrical network. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 The present invention provides a more detailed description of the specific embodiments of a high-density warp-guided galvanic polyester / cotton functional fabric and its finishing method.

[0019] A high-density warp-guided conductive mesh polyester / cotton functional fabric employs a "three-up-one-down" broken twill weave. The warp system consists of polyester / cotton blended yarn (A) and low-elastic conductive composite yarn (B), arranged in a cyclic pattern of "A (M) yarns → B (1) yarns," where M is an integer from 8 to 69, preferably 18 to 34. This design significantly increases the distribution density of the conductive yarn, forming a dense, continuous conductive mesh structure in the warp direction of the fabric, which forms the basis and framework for the conductive function.

[0020] The conductive component of yarn B, a conductive composite yarn, is preferably made of metal fibers such as stainless steel fibers and silver fibers, ensuring low resistance due to the inherent properties of the materials. Its structure can employ a grid-connected or even better core-sheath coating structure to ensure the continuity and reliability of the conductive path.

[0021] After weaving and conventional finishing, a trace amount of conductive polymer bridging treatment is performed. Using a 1%-5% PEDOT:PSS aqueous solution, through padding (40%-60% pick-up) and low-temperature baking (100-120℃, 1-3 min), trace amounts of conductive polymer are selectively deposited and fixed at the yarn intersections, significantly reducing the contact resistance between conductive network nodes, thereby producing a synergistic multiplier effect with the internal conductive network.

[0022] Example 1: High-density warp-conductive fabric 1. Yarn configuration: Yarn A: Polyester / cotton (50 / 50) 32 count blended yarn; Yarn B: 50D / 48F polyester low elastic yarn + 20D / 2F stainless steel fiber conductive yarn, with a mesh structure and a composite twist of 9 twists / 10 cm; Weft yarn: Polyester / cotton (50 / 50) 32 count blended yarn.

[0023] 2. Warp arrangement: The warp yarns are arranged in an "A18 B1" repeating pattern.

[0024] 3. Weaving process: Reference Figure 1 The diagram shows the "three-up-one-down" twill weave pattern. During heddle threading, all conductive yarns B are threaded uniformly into the first heddle frame. The loom is used for weaving, with the following parameters: warp density 30 ends / cm, weft density 30 ends / cm, machine tension 320kg, back beam height +2cm, and machine speed 230 rpm.

[0025] Post-finishing process: (1) Routine finishing: singeing → desizing → setting; (2) Finishing with trace amounts of conductive polymer bridging: Prepare an aqueous solution containing 3% PEDOT:PSS and 3% penetrant (JFC); One dip and one roll, with a roll residue of 50%; Bake at 110℃ for 2 minutes.

[0026] Example 2: Core-Sheath Structure Conductive Fabric 1. Yarn configuration: Yarn A: Same as in Example 1; Yarn B: A covered yarn with 20D stainless steel filament as the core yarn and 40D polyester low elastic yarn as the outer covering yarn; Weft yarn: Same as in Example 1.

[0027] 2. Warp arrangement: The warp yarns are arranged in a “A34 B1” repeat pattern.

[0028] 3. Weaving and finishing: The weaving process is the same as in Example 1. The finishing process only involves routine finishing and does not include bridging finishing.

[0029] The fabrics obtained in the above embodiments were subjected to performance tests, and the results are shown in the table below: Test Project Example 1 Example 2 Comparative Example Surface resistivity (Ω / sq) 8.5×10³ <![CDATA[3.2×10 4 ]]> <![CDATA[5.2×10 5 ]]> Static voltage half-life (s) <0.5 <1.2 <3.0 Wash resistance (resistance after 50 washes) <![CDATA[1.2×10 4 ]]> <![CDATA[4.1×10 4 ]]> <![CDATA[5.8×10 5 ]]> feel and breathability excellent excellent excellent The comparative example used the same fabric as Example 1, but without bridging finishing.

[0030] Test Result Analysis: Example 1 uses a high-density conductive yarn arrangement (A18B1) combined with bridging finishing, exhibiting the best conductivity, with a surface resistivity as low as 8.5×10³Ω / sq, and the resistance value changes very little after 50 washes, proving its excellent durability.

[0031] Example 2 uses a core-sheath structure conductive yarn, and even without bridging finishing, its conductivity is significantly better than the comparative example, proving that the core-sheath structure can provide a more continuous conductive path.

[0032] All fabrics in the embodiments maintained good hand feel and breathability, proving that the present invention effectively balances wearing comfort while achieving high-performance conductivity.

[0033] The bridging finishing process has a significant synergistic enhancement effect, reducing the surface resistance by an order of magnitude, demonstrating its importance in the technical solution of this invention.

[0034] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-density warp-guided mesh polyester / cotton functional fabric, characterized in that: The fabric adopts a "three-up-one-down" twill weave structure, with a warp and weft density of 28-32 yarns / cm. The warp system of the fabric includes two types of yarn: yarn A is a polyester / cotton blended yarn, and yarn B is a low-elasticity conductive composite yarn. The warp yarns are arranged in a cycle unit of "A (M) yarns → B (1) yarns", where M is an integer from 8 to 69. The weft yarn is a polyester / cotton blended yarn.

2. The high-density warp-guided mesh polyester / cotton functional fabric according to claim 1, characterized in that: The value of M in the loop unit ranges from 18 to 34.

3. The high-density warp-guided mesh polyester / cotton functional fabric according to claim 1, characterized in that: The conductive component of the low-elasticity conductive composite yarn B is one of metal fiber, metal-coated fiber or carbon fiber.

4. The high-density warp-guided mesh polyester / cotton functional fabric according to claim 3, characterized in that: The conductive component is stainless steel fiber or silver fiber.

5. The high-density warp-guided mesh polyester / cotton functional fabric according to claim 1, characterized in that: The structure of the low-elasticity conductive composite yarn B is either a grid structure or a core-sheath covering structure; when it is a core-sheath covering structure, the conductive component serves as the core yarn, and is covered with polyester low-elasticity yarn or ordinary textile fiber.

6. The high-density warp-guided mesh polyester / cotton functional fabric according to claim 5, characterized in that: When yarn B has a double-layer structure, its composite twist is controlled at 8-12 twists / 10 cm.

7. The high-density warp-guided mesh polyester / cotton functional fabric according to claim 5, characterized in that: The yarn B of the interconnected structure is made by intertwining and twisting 50D / 48F polyester low elastic yarn and 20D / 2F carbon black conductive yarn.

8. The high-density warp-guided mesh polyester / cotton functional fabric according to claim 1, characterized in that: On both sides of the fabric selvage area, 30-60 yarns B are provided as conductive selvage yarns.

9. A method for preparing the high-density warp-guided mesh polyester / cotton functional fabric as described in any one of claims 1-8, characterized in that, Includes the following steps: Raw material preparation and weaving: Prepare yarn A, yarn B and weft yarn, and after warping, heddle threading and reed threading, weave them into greige fabric on a loom; wherein warping is carried out according to the warp yarn arrangement pattern described in claim 1; when threading the heddle, thread all yarn B into the first heddle frame; (2) Conventional finishing: The fabric obtained in step (1) is successively singed, desized and set; (3) Micro-conductive polymer bridging finishing: The fabric treated in step (2) is immersed in an aqueous solution of conductive polymer finishing agent with a concentration of 1%-5%, wherein the conductive polymer finishing agent is PEDOT:PSS; then it is rolled by a rolling mill, and the roll residue rate is controlled to be 40%-60%; finally, it is baked at 100-120℃ for 1-3 minutes.

10. The method according to claim 9, characterized in that: In step (3), a penetrant accounting for 2%-5% of the total weight of the conductive polymer finishing agent is added to the aqueous solution of the finishing agent.

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