A multi-layer composite fabric with soothing protection function and a preparation method thereof

Abstract

The application discloses a multi-layer composite fabric with soothing and protective functions, which comprises a skin-friendly layer composed of modal fibers, and the outer surface of the skin-friendly layer is provided with an electrically-conductive and antibacterial layer; the electrically-conductive and antibacterial layer is composed of graphene fibers and carbon-based fibers, the graphene fibers are warp yarns, the carbon-based fibers are weft yarns, and the two are interwoven to form the electrically-conductive and antibacterial layer, and the outer surface of the electrically-conductive and antibacterial layer is provided with a pure cotton moisture-retention layer; the outer surface of the pure cotton moisture-retention layer is provided with a jacquard-velvet-like structure layer; the jacquard-velvet-like structure layer is a velvet-like protruding structure formed by the graphene fibers in the electrically-conductive and antibacterial layer extending through the pure cotton moisture-retention layer to the outer surface of the fabric. The application has the beneficial effect of solving the technical problem of how to establish an effective interlayer electric charge conduction channel and a controlled discharge mechanism in a functional separation type composite fabric in the prior art, so as to overcome the technical problem that the existing electrically-conductive fabric can only realize self static electricity dissipation of the fabric, and cannot effectively eliminate the static electricity accumulation between clothing layers.

Description

Technical Field

[0001] This invention relates to the field of textile technology, specifically to a multi-layer composite fabric with soothing and protective functions and its preparation method. Background Technology

[0002] During daily wear, underwear often generates static electricity due to friction between garments or between clothing and skin. Especially in dry environments, when the voltage difference accumulated between multiple layers of clothing exceeds the air breakdown threshold, interlayer discharge occurs, causing stinging or itching sensations on the skin and severely affecting wearing comfort. Underwear is also prone to bacterial growth in a warm and humid environment, and traditional chemical antibacterial agents pose a risk of skin irritation. At the same time, insufficient moisture retention of the fabric can exacerbate dry skin problems.

[0003] The existing technology has the following main limitations:

[0004] First, there are inherent flaws in antistatic solutions. Traditional antistatic fabrics typically employ two methods: one is to blend metal fibers into the fabric, which reduces the fabric's own resistance but fails to establish a directional charge conduction channel from the inner to the outer layer, leaving interlayer discharge problems unresolved. The other method involves using conductive polymers for finishing, but these chemical finishing agents have poor wash resistance, and residues may cause skin allergies.

[0005] Secondly, the integration of functions is low. Existing products often only focus on a single function, such as only solving antistatic or only providing antibacterial properties. They lack integrated and systematic solutions that combine the three major requirements of "inhibiting interlayer electrostatic discharge", "maintaining skin microenvironment humidity" and "achieving safe physical antibacterial properties".

[0006] Thirdly, there is a conflict between safety and durability. While solutions relying on chemical additives can be effective in the short term, there is a risk of chemical substances penetrating and irritating the skin, and the function rapidly declines with each wash, making it difficult to meet the requirements of long-term safety and functional stability for intimate apparel. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a multi-layer composite fabric with soothing and protective functions and its preparation method. This invention solves the problem in the prior art of how to establish an effective interlayer charge conduction channel and a controlled discharge mechanism in functionally separated composite fabrics, so as to overcome the technical problem that existing conductive fabrics can only achieve static dissipation of the fabric itself, but cannot effectively eliminate the accumulation of static electricity between clothing layers.

[0008] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a multilayer composite fabric with soothing and protective functions, comprising:

[0010] The skin-friendly layer is composed of modal fibers, and a conductive antibacterial layer is provided on the outer surface of the skin-friendly layer. The conductive antibacterial layer is composed of graphene fibers and carbon-based fibers, with the graphene fibers as warp yarns and the carbon-based fibers as weft yarns, which are interwoven. A pure cotton moisturizing layer is provided on the outer surface of the conductive antibacterial layer. A jacquard velvet structure layer is provided on the outer surface of the pure cotton moisturizing layer. The jacquard velvet structure layer is a velvet-like protrusion structure formed by the graphene fibers in the conductive antibacterial layer extending through the pure cotton moisturizing layer to the outer surface of the fabric. A heat-fused adhesive fiber web is provided between the skin-friendly layer, the conductive antibacterial layer, the pure cotton moisturizing layer and the jacquard velvet structure layer, and the four-layer structure is fixed by hot-pressing composite.

[0011] In some embodiments, the height of the pile-like protrusions in the jacquard pile-like structure layer is 0.3–1.5 mm, and the density of the pile-like protrusions is 800–2500 per cm³. 2 Furthermore, the top of the velvety protrusion has a slightly rounded flat top structure with a top curvature radius of 10–50 μm.

[0012] In some embodiments, the surface resistivity of the conductive antibacterial layer is 10. 2 ~10 4 Ω / sq, electrostatic half-life ≤1.0s; and the conductive antibacterial layer has an antibacterial rate of ≥95% against Staphylococcus aureus and an antibacterial rate of ≥93% against Escherichia coli.

[0013] In some embodiments, the moisture permeability of the pure cotton moisturizing layer is ≥8000g / m². 2 ·24h.

[0014] In some embodiments, the aqueous extract of the skin-friendly layer has a pH value of 5.5 to 7.0, a formaldehyde content of ≤20 mg / kg, and a friction coefficient of ≤0.15.

[0015] In some embodiments, the peel strength between two adjacent layers in the four-layer structure is ≥10 N / cm.

[0016] In some embodiments, the intimate apparel is underwear, pajamas, or socks.

[0017] In some embodiments,

[0018] S1. Prepare the skin-friendly layer by using modal fibers with a fineness of 0.8 to 1.3 dtex and weaving them into a skin-friendly fabric;

[0019] S2. Prepare a conductive antibacterial layer by weaving graphene fibers and carbon-based fibers to form a conductive antibacterial fabric. The graphene content of the graphene fibers is 0.2% to 0.5% by mass, and the carbon-based fibers are at least one of carbon fiber or carbon nanotube fiber.

[0020] S3. Prepare a pure cotton moisturizing layer, using pure cotton fabric or cotton blended fabric with a cotton content of ≥95% as the moisturizing layer fabric.

[0021] S4. Prepare a jacquard pile structure layer. Through jacquard weaving process, the graphene fibers in the conductive antibacterial layer extend through the fiber gaps of the pure cotton moisturizing layer to the outermost surface of the fabric to form loop pile. After shearing, a pile-like raised structure with a raised height of 0.3 to 1.5 mm is obtained. Then, after heat setting treatment, the top of the raised structure is a slightly rounded flat top structure with a top curvature radius of 10 to 50 μm.

[0022] S5. Composite: A layer of low-melting-point hot-melt adhesive fiber mesh is laid between each of the two adjacent layers of the four-layer structure; the four-layer structure after laying the adhesive fiber mesh is stacked in sequence and fixed by hot pressing composite, wherein the skin-friendly layer is prepared separately and then composited.

[0023] In some embodiments, in step S5, the melting point of the low-melting-point hot-melt adhesive fiber web is 100℃~120℃, and the areal density is 10~20g / m³. 2 The hot-pressing composite temperature is 120℃~140℃, the pressure is 0.25MPa~0.40MPa, and the holding time is 45s~90s.

[0024] In some embodiments, in step S5, the temperature of hot pressing is 130℃±5℃, the pressure is 0.3MPa±0.05MPa, and the holding time is 60s±10s.

[0025] Compared with existing technologies, this invention provides a multi-layer composite fabric with soothing and protective functions. Through jacquard weaving, the graphene fibers in the conductive antibacterial layer are precisely extended and exposed on the outermost surface of the fabric, forming dense velvety protrusions. This structure creates a directional physical charge conduction path within the fabric, from the skin-friendly layer and the conductive antibacterial layer to the jacquard velvety structure layer. When static electricity is generated by human activity, the charge can be quickly guided to the outer surface of the fabric through this path. At the same time, the micron-sized velvety protrusions on the outer surface form a large number of sharp discharge points, which can actively and efficiently release the accumulated charge into the air. This fundamentally solves the problem of interlayer discharge caused by excessive voltage difference between multiple layers of clothing, significantly improving wearing comfort. The conductive antibacterial layer is made of graphene fibers and carbon-based fibers interwoven in warp and weft. Graphene itself has excellent conductivity and a unique two-dimensional sheet structure. Its nanoscale edges can physically destroy bacterial cell membranes, achieving... This product features physical antibacterial properties without chemical additives. Graphene and carbon-based fibers together impart excellent electrical conductivity to the layer. Since its function originates entirely from the fiber itself, rather than from surface coatings or finishing agents, it exhibits excellent wash resistance, and its function does not diminish with repeated washing. This completely avoids the skin irritation or sensitization risks that chemical antibacterial and antistatic agents may cause. The inner layer is composed of ultra-fine modal fibers, which are skin-friendly, have high moisture regain, and a silky feel. The pH value and formaldehyde content of the water extract meet the safety standards for direct skin contact, ensuring ultimate skin-friendliness and safety. The middle layer uses high-moisture-permeable pure cotton or cotton-blend materials as a moisturizing layer, effectively regulating the temperature and humidity balance of the skin surface and preventing itching and discomfort caused by dryness. All functional structures are firmly bonded together through low-melting-point hot-melt bonding of the fiber web and a precisely controlled hot-pressing process. The peel strength between adjacent layers is ≥10N / cm, ensuring the structural integrity of the fabric during long-term wear and repeated washing. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the unfolded structure of a multi-layer composite fabric with soothing and protective functions provided in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal conductive antibacterial layer of a multilayer composite fabric with soothing and protective functions provided in an embodiment of the present invention.

[0028] Figure 3 This is a top view of the jacquard velvet structure layer of the multi-layer composite fabric with soothing and protective functions provided in the embodiments of the present invention;

[0029] Figure 4 This is a schematic diagram of the charge conduction path of a multilayer composite fabric with soothing and protective functions provided in an embodiment of the present invention;

[0030] Figure 5This is a comparison chart of pruritus scores in the elderly population using multi-layer composite fabrics with soothing and protective functions, as provided in this embodiment of the invention.

[0031] Figure 6 This is a comparison chart of discharge frequencies under different relative humidity conditions for the multi-layer composite fabric with soothing and protective functions provided in the embodiments of the present invention.

[0032] Explanation of reference numerals in the attached diagram: 1. Skin-friendly layer; 2. Conductive antibacterial layer; 21. Graphene fiber; 22. Carbon-based fiber; 3. Pure cotton moisturizing layer; 4. Jacquard velvet structure layer; 41. Velvet protrusion; 5. Thermofused adhesive fiber web. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a multi-layer composite fabric with soothing and protective functions according to an embodiment of the present invention. The multi-layer composite fabric with soothing and protective functions includes: a skin-friendly layer 1, which is composed of modal fibers, and a conductive antibacterial layer 2 is provided on the outer surface of the skin-friendly layer 1; the conductive antibacterial layer 2 is composed of graphene fibers 21 and carbon-based fibers 22, with graphene fibers 21 as warp yarns and carbon-based fibers 22 as weft yarns, which are interwoven; a pure cotton moisturizing layer 3 is provided on the outer surface of the conductive antibacterial layer 2; a jacquard velvet structure layer 4 is provided on the outer surface of the pure cotton moisturizing layer 3; the jacquard velvet structure layer 4 is a velvet-like protrusion 41 structure formed by the graphene fibers 21 in the conductive antibacterial layer 2 extending through the pure cotton moisturizing layer 3 to the outer surface of the fabric; a hot-melt adhesive fiber web 5 is provided between the skin-friendly layer 1, the conductive antibacterial layer 2, the pure cotton moisturizing layer 3 and the jacquard velvet structure layer 4, and the four-layer structure is fixed by hot pressing.

[0035] In this embodiment, through jacquard weaving, the graphene fibers 21 in the conductive antibacterial layer 2 are precisely extended and exposed on the outermost surface of the fabric, forming dense velvety protrusions 41. This structure constructs a directional physical charge conduction path within the fabric, from the skin-friendly layer 1, the conductive antibacterial layer 2 to the jacquard velvety structure layer 4. When static electricity is generated by human activity, the charge can be quickly guided to the outer surface of the fabric through this path. The micron-sized velvety protrusions 41 on the outer surface form a large number of tip discharge points, which can actively and efficiently release the accumulated charge into the air, thereby fundamentally solving the problem of interlayer discharge caused by excessive voltage difference between multiple layers of clothing, significantly improving wearing comfort. The conductive antibacterial layer 2 is made of graphene fibers 21 and carbon-based fibers 22 interwoven. Graphene itself has excellent conductivity and a unique two-dimensional sheet structure. Its nanoscale edges can physically destroy bacterial cell membranes, achieving physical antibacterial properties without chemical additives. The graphene and carbon-based fiber 22 together endow this layer with excellent electrical conductivity. Since the function is entirely derived from the fiber itself, rather than a surface coating or finishing agent, it has excellent wash resistance and its function will not decrease with repeated washing. This completely avoids the skin irritation or sensitization risks that chemical antibacterial and antistatic agents may cause. The inner layer is composed of ultra-fine modal fiber to form a skin-friendly layer 1, which has a high moisture regain rate and a silky feel. The pH value and formaldehyde content of the water extract meet the safety standards for direct contact with the skin, ensuring ultimate skin-friendliness and safety. The middle layer uses pure cotton or high-cotton blend material with high moisture permeability as a moisturizing layer, which can effectively regulate the temperature and humidity balance of the skin surface and prevent itching and discomfort caused by dryness. All functional structures are firmly bonded together by low-melting-point hot-melt bonding fiber web 5 and precise hot-pressing process. The peel strength between adjacent layers is ≥10N / cm, ensuring the structural integrity of the fabric during long-term wear and repeated washing.

[0036] Example 1: Preparation of a four-layer composite fabric (basic example)

[0037] The skin-friendly layer 1 is made of modal fiber with a fineness of 1.1 dtex, a thickness of 0.3 mm, and a fabric surface density of 120 g / m². 2 The aqueous extract has a pH of 6.2, a formaldehyde content of 12 mg / kg, and a coefficient of friction of 0.13; the conductive antibacterial layer 2 is composed of graphene fiber 21, with a graphene mass percentage of 0.3% and a volume resistivity of approximately 10 Ω·cm. -1 The graphene nanosheets, measured by TEM, have a radius of curvature of 8–35 nm, consisting of warp yarns and carbon nanotube fibers, with a bulk resistivity of approximately 10 Ω·cm. -3 Ω·cm represents the interlacing of weft and warp yarns, with a fabric surface density of 150 g / m². 2 Surface resistivity 5×10 3 Ω / sq, electrostatic half-life 0.8s; the pure cotton moisturizing layer 3 is made of 100% pure cotton fabric with a fabric surface density of 160g / m³. 2, moisture permeability 8500g / m 2 • 24h; The jacquard pile structure layer 4 is formed by controlling the height of the raised sections to 0.8mm and the density of the pile raised sections 41 to approximately 1500 per cm². 2 The velvety protrusions 41 have a top curvature radius measured by SEM to be 15–25 μm. In the four-layer structure, a layer of low-melting-point hot-melt adhesive fiber mesh 5 (polyethylene copolymer fiber, melting point 115℃, areal density 15 g / m³) is laid between each adjacent layer. 2 The skin-friendly layer is bonded to the three layers in one piece, and the hot-pressing composite temperature is 130℃, the pressure is 0.3MPa, and the holding time is 60s. Performance test results: antibacterial rate against Staphylococcus aureus is 96.2% (determined according to GB / T20944.3), antibacterial rate against Escherichia coli is 94.5% (determined according to GB / T20944.3), electrostatic half-life is 0.8s (determined according to GB / T12703.1), skin pruritus score is 1.1 (n=30, RH=25%±5%, 4-hour wear test), electrostatic discharge frequency is reduced by 91% compared with ordinary fabric, interlayer peel strength is 11.2±0.7N / cm (determined according to GB / T2790, n=5), the top curvature radius of the velvety protrusions is 15~25μm, and the corona voltage is 380~450V.

[0038] Example 2: Increasing the height of the protrusion

[0039] Based on Example 1, the height of the velvety protrusions 41 was increased to 1.2 mm, and the density of the velvety protrusions 41 was adjusted to approximately 1800 protrusions / cm². 2 The top curvature radius measured by SEM was 30-40 μm, the electrostatic discharge frequency reduction rate remained at 90%, and the skin itching score was 1.0. Other parameters were the same as in Example 1. The interlayer peel strength test (measured according to GB / T2790, sample width 25 mm, tensile speed 100 mm / min, environment 20℃±2℃ / RH=65%±5%, n=5) was 12.1±0.9 N / cm, and the corona initiation voltage was 400-480 V.

[0040] Example 3: Carbon nanotube fibers as a substitute for carbon fibers

[0041] The conductive antibacterial layer 2 uses carbon nanotube fibers instead of carbon fibers as the weft yarn, and the pure cotton moisturizing layer 3 uses a cotton blend fabric with 95% cotton content and 5% spandex content, with a fabric surface density of 145 g / m². 2 The height of the velvety protrusion 41 is 0.5 mm, and the density of the velvety protrusion 41 is approximately 1000 per cm³. 2 The radius of curvature at the top, as measured by SEM, is 12–20 μm.

[0042] Performance test results: Staphylococcus aureus antibacterial rate 95.8%, Escherichia coli antibacterial rate 94.1%, electrostatic half-life 0.9s, electrostatic discharge frequency reduced by 90% compared to ordinary fabrics, and moisture permeability 8500g / m². 2 • After 24 hours, the interlaminar peel strength was 10.5 ± 0.8 N / cm (measured according to GB / T2790, n=5).

[0043] Example 4: Carbon fiber weft yarn solution

[0044] The conductive antibacterial layer 2 is made of carbon fiber (volume resistivity approximately 10 Ω·cm). -4 Ω·cm) was used to replace carbon nanotube fibers as weft yarn, and the other parameters were the same as in Example 1;

[0045] Performance test results: Staphylococcus aureus antibacterial rate 96.0%, Escherichia coli antibacterial rate 94.3%, electrostatic half-life 0.85s, electrostatic discharge frequency reduced by 91% compared with ordinary fabric, and interlayer peel strength 11.0±0.8N / cm (measured according to GB / T2790, n=5).

[0046] Example 5: Lower limits of graphene content and process parameters

[0047] The following adjustments were made based on Example 1: the fineness of the modal fiber was adjusted to 0.8 dtex, the graphene mass percentage of graphene fiber 21 was adjusted to 0.2%, the curvature radius of the graphene nanosheets was measured by TEM to be 5-15 nm, the hot-pressing composite temperature was adjusted to 120℃, the pressure was adjusted to 0.25 MPa, the holding time was adjusted to 45 s, the melting point of the low-melting-point hot-melt bonded fiber web 5 was adjusted to 100℃ and the areal density was adjusted to 10 g / m², and the remaining parameters were the same as in Example 1.

[0048] Performance test results: Antibacterial rate against Staphylococcus aureus 95.1%, antibacterial rate against Escherichia coli 93.2%, electrostatic half-life 0.95s, and interlayer peel strength 10.2±0.8N / cm (measured according to GB / T2790, n=5).

[0049] Example 6: Upper limit of graphene content and upper limit of process parameters

[0050] The following adjustments were made based on Example 1: the fineness of the modal fiber was adjusted to 1.3 dtex, the graphene mass percentage of graphene fiber 21 was adjusted to 0.5%, the curvature radius of the graphene nanosheets was measured by TEM to be 30-50 nm, the hot-pressing composite temperature was adjusted to 140℃, the pressure was adjusted to 0.40 MPa, the holding time was adjusted to 90 s, the melting point of the low-melting-point hot-melt bonded fiber web 5 was adjusted to 120℃, and the areal density was adjusted to 20 g / m², with the remaining parameters the same as in Example 1;

[0051] Performance test results: Antibacterial rate against Staphylococcus aureus 97.5%, antibacterial rate against Escherichia coli 95.8%, electrostatic half-life 0.7s, and interlayer peel strength 13.8±0.6N / cm (measured according to GB / T2790, n=5).

[0052] Example 7: Lower limit of the height of the velvety protrusion 41

[0053] Based on Example 1, the height of the velvety protrusions 41 was adjusted to 0.3 mm, the density of the velvety protrusions 41 was about 2500 per cm², and the top curvature radius was measured to be 10-15 μm by SEM.

[0054] Performance test results: The electrostatic discharge frequency is reduced by 90% compared with ordinary fabrics, the electrostatic half-life is 0.9s (measured according to GB / T12703.1), the corona initiation voltage is 350~420V (actual measurement), and the interlayer peel strength is 10.8±0.7N / cm.

[0055] Example 8: Upper limit of height of velvety protrusion 41

[0056] Based on Example 1, the height of the velvety protrusions 41 was adjusted to 1.5 mm, and the density of the velvety protrusions 41 was approximately 800 per cm³. 2 The radius of curvature at the top was measured to be 40–50 μm by SEM.

[0057] Performance test results: The electrostatic discharge frequency is reduced by 89% compared with ordinary fabrics, the electrostatic half-life is 1.0s (measured according to GB / T12703.1), the corona initiation voltage is 380~400V (actual measurement), and the interlayer peel strength is 10.2±0.9N / cm.

[0058] Example 9: Safety test of skin-friendly layer 1

[0059] The skin-friendly layer 1 fabric prepared according to Example 1 was subjected to safety tests. The pH value of the water extract was determined (according to GB / T7573 standard): pH value 6.2; the formaldehyde content was determined (according to GB / T2912.1 standard): 12mg / kg; the coefficient of friction was determined (according to GB / T10006 standard, test speed 100mm / min, positive pressure 100g, 20℃±2℃, RH=65%±5%): 0.13.

[0060] Example 10: Wearing Test in an Elderly Population

[0061] In an elderly population (60–75 years old, n=30), subjects wore the underwear continuously for 4 weeks under ambient temperatures of 20℃±2℃ and relative humidity of 25%±5%. The experimental group (the fabric of this invention, prepared according to Example 1, n=30) and the control group (commercially available pure cotton underwear, n=30) showed the following differences: pruritus score 1.2±0.3 vs. 3.6±0.8 (Mann-Whitney U test, U=52, p<0.001); electrostatic discharge events 0.3 times / day vs. 12.3 times / day; skin erythema incidence 6.7% vs. 43.3%; and skin moisture retention rate 16.8%.

[0062] Example 11: Washability Test

[0063] The fabric prepared according to Example 1 was washed 100 times (washing program 4N) according to GB / T8629 standard. The performance test results after 100 washes were as follows: the antibacterial rate remained at 91.3%, the electrostatic half-life was ≤1.5s, the pile-like protrusion 41 structure did not collapse or fall off (protrusion height 0.68mm, attenuation 15%), and the interlayer peel strength was 9.5±0.6N / cm (n=5).

[0064] Example 12: Peel Strength Process Optimization

[0065] Based on Example 1, the surface density of the hot-melt bonded fiber web was increased to 20 g / m². 2 The hot-pressing composite temperature was adjusted to 140℃, the pressure was adjusted to 0.4MPa, the holding time was adjusted to 90s, and the interlayer peel strength reached 13.5±0.8N / cm (measured according to GB / T2790 standard, n=5).

[0066] Comparative Example 1: Three-layer structure (excluding jacquard velvet structure layer 4)

[0067] The same skin-friendly layer 1, conductive antibacterial layer 2, and pure cotton moisturizing layer 3 as in Example 1 are used, but the jacquard velvet structure layer 4 is not provided, that is, the graphene fiber 21 of the conductive antibacterial layer 2 does not extend to the outer surface of the fabric, and the three-layer structure is fixed by hot pressing composite.

[0068] Performance test results: Staphylococcus aureus antibacterial rate 95.8% (comparable to Example 1), Escherichia coli antibacterial rate 94.0%, electrostatic half-life 2.5s (Example 1: 0.8s), electrostatic discharge frequency 6.8 times / day (Example 1: 1.5 times / day), and skin itching score 2.8 points (Example 1: 1.1 points). The results indicate that without the jacquard velvet structure layer 4, the conductive antibacterial layer 2 dissipates static electricity only through the fabric's own passive conductivity mechanism, failing to establish a directional charge conduction path from the conductive antibacterial layer 2 to the outer surface of the fabric. The tip discharge effect is lost, and interlayer charges cannot be actively dissipated through the velvet protrusions 41. The electrostatic dissipation rate decreases by approximately 68% (half-life increases from 0.8s to 2.5s). This comparative example demonstrates that the velvet protrusions 41 in the jacquard velvet structure layer 4 are a necessary technical feature for achieving active tip discharge dissipation.

[0069] Comparative Example 2: Three-layer structure without conductive antibacterial layer 2

[0070] The three layers are fixed by hot pressing: a skin-friendly layer 1 (same as in Example 1), a pure cotton moisturizing layer 3 (same as in Example 1), and an ordinary cotton lint outer layer (excluding graphene fiber 21 and carbon-based fiber 22).

[0071] Performance test results: Antibacterial rate against Staphylococcus aureus 23.5% (96.2% in Example 1), antibacterial rate against Escherichia coli 18.2% (94.5% in Example 1), electrostatic half-life 8.6s (0.8s in Example 1), electrostatic discharge frequency 14.1 times / day (1.5 times / day in Example 1), and skin itching score 3.8 points (1.1 points in Example 1).

[0072] The results showed that the antibacterial and antistatic functions were significantly lost without the conductive antibacterial layer 2, proving that the conductive antibacterial layer 2 (graphene fiber 21 / carbon-based fiber 22) is a necessary technical feature for achieving broad-spectrum antibacterial and rapid static dissipation.

[0073] Comparative Example 3: Planar conductive layer replaces jacquard velvet structure layer 4

[0074] The same skin-friendly layer 1, conductive antibacterial layer 2 and pure cotton moisturizing layer 3 as in Example 1 are used. The outer layer is made of graphene fiber 21 planar fabric (non-fleece protrusion 41 structure), that is, the graphene fiber 21 of the conductive antibacterial layer 2 extends to the outer surface of the fabric in a planar form but does not form protrusions.

[0075] Performance test results: Antibacterial rate against Staphylococcus aureus was 95.5% (comparable to Example 1), electrostatic half-life was 3.1s (0.8s in Example 1), electrostatic discharge frequency was 6.2 times / day (1.5 times / day in Example 1), and skin pruritus score was 2.6 points (1.1 points in Example 1).

[0076] The results show that although the planar conductive layer can establish a charge conduction path, due to the lack of a tip discharge effect, the charge can only be dissipated through passive conduction, and the electrostatic dissipation efficiency is only about 26% of that of the velvety protrusion 41 structure. This comparative example demonstrates that the tip geometry (radius of curvature 10-50 μm) of the velvety protrusion 41 plays a key role in achieving active corona discharge dissipation.

[0077] To better understand this invention, the following is combined with... Figures 1 to 6 The technical solution of the present invention will be described in detail below:

[0078] S1, Preparation of the skin-friendly layer 1

[0079] Raw material preparation: Select modal short fibers with a fineness of 0.8 to 1.3 dtex. This fineness range is crucial. If it is too coarse (>1.3 dtex), the fabric will feel rough and the coefficient of friction will increase. If it is too fine (<0.8 dtex), it will significantly reduce the yarn strength and affect weaving efficiency and the durability of the finished product.

[0080] Spinning and weaving: Modal fibers are spun into single yarns or plied yarns of suitable count through conventional spinning processes such as cleaning and combing, drawing, roving, and spinning. These are then woven into knitted fabrics of moderate weight, such as 120-180 g / m², using circular knitting machines or warp knitting machines with weave structures such as plain weave, rib weave, or pique. 2 The entire process requires strict control of the workshop temperature and humidity, with a temperature of 25±2℃ and a relative humidity of 65±5%, to ensure uniform yarn tension and reduce yarn breakage.

[0081] Post-treatment: The obtained fabric is biopolished, treated with cellulase and mercerized to further remove fuzz, improve the surface smoothness and silkiness of the fabric, and ensure that the pH value of its water extract (5.5~7.0), formaldehyde content (≤20mg / kg) and coefficient of friction (≤0.15) meet the safety standards for direct contact with skin.

[0082] S2, Preparation of conductive antibacterial layer 2

[0083] Yarn preparation:

[0084] Warp yarn: Graphene-modified polyester or nylon filament / staple yarn with a graphene content of 0.2% to 0.5% by weight is selected. This content range has been verified to ensure excellent conductivity and antibacterial properties without excessive damage to the mechanical properties of the fiber matrix or excessive cost due to excessive graphene addition.

[0085] Weft yarn: Carbon fiber or carbon nanotube fiber, or a blend of both, is selected. Carbon-based fiber 22 provides additional conductive pathways and structural support.

[0086] Weaving: The warp and weft yarns are interwoven on a rapier loom or air-jet loom in a plain or twill weave. Special attention must be paid to tension control during weaving to prevent the brittle carbon-based fibers from breaking. The resulting conductive antibacterial fabric typically has a weight of 80-150 g / m². 2 between;

[0087] S3, Preparation of pure cotton moisturizing layer 3

[0088] Fabric selection: Purchase commercially available fabrics that meet the requirements directly. High-count, high-density pure cotton poplin or voile, or cotton-spandex blended knitted fabrics with a cotton content of ≥95% are suitable options. The selected fabrics must have high moisture permeability to ensure good moisture management.

[0089] S4. Preparation of jacquard velvet-like structural layer 4

[0090] Integrated weaving: This step is not to prepare separately and then composite, but to put the prepared conductive antibacterial layer 2 as the bottom layer and the pure cotton moisturizing layer 3 as the top layer together on the machine and perform composite weaving on an electronic jacquard loom.

[0091] Jacquard process: While weaving the pure cotton moisturizing layer 3 fabric, the graphene warp yarn in the conductive antibacterial layer 2 is lifted at a specific position through precise control of the jacquard head, so that it passes through the gap between the warp and weft yarns of the pure cotton moisturizing layer 3 and extends to the outermost surface of the fabric to form a loop pile structure.

[0092] Shearing and shaping:

[0093] Shearing: After weaving, the loop pile is cut using a precision shearing machine to obtain pile-like protrusions 41 with a height precisely controlled between 0.3 and 1.5 mm. Within this range, the pile height can ensure the tip discharge effect and maintain the structure's uprightness and prevent it from collapsing.

[0094] Heat setting: The semi-finished product after shearing is sent to a heat setting machine and treated in a dry heat environment of 180-200℃. The high temperature causes the synthetic fibers at the tip of the pile to melt slightly and shrink naturally under the action of surface tension to form a slightly rounded flat top. The radius of curvature is controlled between 10 and 50 μm. This step is crucial. It not only blunts the tip to ensure comfort and safety, but also locks in the shape of the pile to prevent it from deforming in subsequent processing and use.

[0095] S5, Composite

[0096] Layering: The prepared skin-friendly layer 1, conductive antibacterial layer 2, which are now integrally formed with pure cotton moisturizing layer 3 and jacquard velvet structure layer 4, and the low melting point hot melt adhesive fiber web 5 used for bonding are stacked in sequence.

[0097] Hot pressing: The stacked multi-layered materials are fed into a flat vulcanizing machine or a continuous hot press. Under a temperature of 120℃~140℃ and a pressure of 0.25MPa~0.40MPa, the pressure is held for 45s~90s. Under these conditions, the low-melting-point adhesive fiber web melts and penetrates into the pores of the adjacent two layers of fabric. After cooling, it forms a strong bonding point, making the four-layer structure a whole. The peel strength between adjacent layers is ≥10N / cm. The preferred parameters are 130℃±5℃, 0.3MPa±0.05MPa, and 60s±10s to balance the bonding strength and production efficiency.

[0098] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-layer composite fabric with soothing and protective functions, characterized in that, include: The skin-friendly layer is composed of modal fibers, and a conductive antibacterial layer is provided on the outer surface of the skin-friendly layer. The conductive antibacterial layer is composed of graphene fibers and carbon-based fibers, with the graphene fibers as warp yarns and the carbon-based fibers as weft yarns, which are interwoven. A pure cotton moisturizing layer is provided on the outer surface of the conductive antibacterial layer. A jacquard velvet structure layer is provided on the outer surface of the pure cotton moisturizing layer. The jacquard velvet structure layer is a velvet-like protrusion structure formed by the graphene fibers in the conductive antibacterial layer extending through the pure cotton moisturizing layer to the outer surface of the fabric. A heat-fused adhesive fiber web is provided between the skin-friendly layer, the conductive antibacterial layer, the pure cotton moisturizing layer and the jacquard velvet structure layer, and the four-layer structure is fixed by hot-pressing composite.

2. The multi-layer composite fabric with soothing and protective functions according to claim 1, characterized in that: The height of the pile-like protrusions in the jacquard pile-like structure layer is 0.3–1.5 mm, and the density of the pile-like protrusions is 800–2500 per cm³. 2 Furthermore, the top of the velvety protrusion has a slightly rounded flat top structure with a top curvature radius of 10–50 μm.

3. The multi-layer composite fabric with soothing and protective functions according to claim 1, characterized in that: The surface resistivity of the conductive antibacterial layer is 10. 2 ~10 4 Ω / sq, electrostatic half-life ≤1.0s; and the conductive antibacterial layer has an antibacterial rate of ≥95% against Staphylococcus aureus and an antibacterial rate of ≥93% against Escherichia coli.

4. The multi-layer composite fabric with soothing and protective functions according to claim 1, characterized in that: The moisture permeability of the pure cotton moisturizing layer is ≥8000g / m². 2 ·24h.

5. A multi-layer composite fabric with soothing and protective functions according to claim 1, characterized in that: The aqueous extract of the skin-friendly layer has a pH value of 5.5 to 7.0, a formaldehyde content of ≤20mg / kg, and a friction coefficient of ≤0.

15.

6. The multi-layer composite fabric with soothing and protective functions according to claim 1, characterized in that: The peel strength between two adjacent layers in the four-layer structure is ≥10 N / cm.

7. A close-fitting garment, made of any one of the multi-layer composite fabrics according to claims 1 to 6, characterized in that: The intimate clothing referred to is underwear, pajamas, or socks.

8. A method for preparing a multilayer composite fabric with soothing and protective functions, applicable to the multilayer composite fabric with soothing and protective functions as described in any one of claims 1-6, characterized in that: S1. Prepare the skin-friendly layer by using modal fibers with a fineness of 0.8 to 1.3 dtex and weaving them into a skin-friendly fabric; S2. Prepare a conductive antibacterial layer by weaving graphene fibers and carbon-based fibers to form a conductive antibacterial fabric. The graphene content of the graphene fibers is 0.2% to 0.5% by mass, and the carbon-based fibers are at least one of carbon fiber or carbon nanotube fiber. S3. Prepare a pure cotton moisturizing layer, using pure cotton fabric or cotton blended fabric with a cotton content of ≥95% as the moisturizing layer fabric. S4. Prepare a jacquard pile structure layer. Through jacquard weaving process, the graphene fibers in the conductive antibacterial layer extend through the fiber gaps of the pure cotton moisturizing layer to the outermost surface of the fabric to form loop pile. After shearing, a pile-like raised structure with a raised height of 0.3 to 1.5 mm is obtained. Then, after heat setting treatment, the top of the raised structure is a slightly rounded flat top structure with a top curvature radius of 10 to 50 μm. S5. Composite: A layer of low-melting-point hot-melt adhesive fiber mesh is laid between each of the two adjacent layers of the four-layer structure; the four-layer structure after laying the adhesive fiber mesh is stacked in sequence and fixed by hot pressing composite, wherein the skin-friendly layer is prepared separately and then composited.

9. The method for preparing a multilayer composite fabric with soothing and protective functions according to claim 8, characterized in that: In step S5, the melting point of the low-melting-point hot-melt adhesive fiber web is 100℃~120℃, and the areal density is 10~20g / m³. 2 The hot-pressing composite temperature is 120℃~140℃, the pressure is 0.25MPa~0.40MPa, and the holding time is 45s~90s.

10. A method for preparing a multilayer composite fabric with soothing and protective functions according to claim 9, characterized in that: In step S5, the temperature of hot pressing is 130℃±5℃, the pressure is 0.3MPa±0.05MPa, and the holding time is 60s±10s.

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