Antistatic humidity-regulating polyester composite fabric and preparation method thereof

Abstract

The present application relates to a kind of antistatic humidity regulating polyester composite fabric and its preparation method.The fabric includes polyester matrix layer, humidity regulating layer, conductive mesh layer and discrete adhesive layer from inside to outside.The humidity regulating layer is polyvinyl alcohol and polyurethane interpenetrating network porous membrane, the thickness is 15-40 μm, and its calcium chloride mass fraction and pore size increase along the film thickness direction, with good humidity regulating performance;The conductive mesh layer is woven by core-sheath type conductive filament, which enhances the antistatic performance of the fabric;Discrete adhesive layer is point-like heat-light curing acrylate adhesive, which ensures stable bonding between layers and maintains good moisture permeability.The preparation method includes freeze-thaw cycle preparation of humidity regulating layer, corona treatment of conductive mesh layer and light curing process of discrete adhesive layer.The composite fabric has excellent humidity regulating effect, antistatic performance and good wearing comfort.

Description

Technical Field

[0001] This invention relates to the technical field of polyester fabrics, and in particular to an antistatic and humidity-regulating polyester composite fabric and its preparation method. Background Technology

[0002] Currently, polyester fabrics are widely used in everyday clothing, industrial fabrics, and other textiles. While they possess excellent durability, strength, and abrasion resistance, their performance in humidity regulation and static electricity protection has not yet reached ideal levels. Especially in humid environments or those with large temperature differences, traditional polyester fabrics are prone to problems with poor breathability and moisture absorption, leading to a damp and uncomfortable feeling when in contact with the fabric, thus affecting the wearing experience. Furthermore, due to the poor conductivity of polyester fibers, static electricity accumulation in humid environments continues to trouble consumers and users, especially under high humidity conditions. This static electricity accumulation in traditional fabrics is more severe, potentially causing discomfort and triggering electrostatic discharge, thus affecting safety and comfort.

[0003] To address these issues, existing technologies have developed composite fabrics with humidity-regulating functions and enhanced their electrostatic protection capabilities through various treatment methods. For example, different coating materials and conductive additives are used to improve the fabric's humidity regulation and antistatic properties. However, most existing humidity-regulating materials are single-component, with limited moisture-regulating performance and an inability to maintain stable performance under varying humidity conditions. Furthermore, while some antistatic fabrics utilize conductive fibers or incorporate conductive substances, their antistatic effects still fall short of requirements in high-humidity environments, and they are prone to failure, especially with prolonged use.

[0004] Meanwhile, existing polyester composite fabrics also have certain shortcomings in terms of interlayer bonding strength, breathability, and comfort. The coating process used in traditional composite technology can easily lead to a decrease in the fabric's moisture permeability, affecting wearing comfort and the overall function of the fabric. On the other hand, traditional bonding layer designs often fail to maintain sufficient breathability while ensuring a stable bond, resulting in unsatisfactory breathability in actual use. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for preparing stain-resistant, oil-repellent, and moisture-permeable cotton fibers and fabrics using them.

[0006] An antistatic humidity-regulating polyester composite fabric, comprising, from the inside out:

[0007] Polyester base fabric;

[0008] The humidity-regulating layer is a porous membrane of polyvinyl alcohol and polyurethane interpenetrating network with a thickness of 15-40 μm. The pore size increases along the thickness direction of the membrane towards the side away from the polyester matrix. It contains 10-40 wt% calcium chloride, and its mass fraction increases along the thickness direction of the membrane towards the side away from the polyester matrix.

[0009] The conductive mesh layer is woven from core-sheath type conductive filaments;

[0010] The discrete adhesive layer is a dot-shaped thermo-curable acrylic adhesive, with the area ratio of adhesive dots to non-adhesive areas not exceeding 15%.

[0011] By employing a gradient design where the calcium chloride mass fraction and pore size of the moisture-regulating layer increase along the membrane thickness, excellent humidity responsiveness and directionality are achieved, significantly enhancing the fabric's dehumidification effect and humidity regulation stability. In environments with significant humidity fluctuations, the fabric effectively absorbs moisture and maintains a dry feel, reducing wet contact between the body and the fabric. The conductive mesh layer optimizes the fabric's conductivity, enhances antistatic properties, and prevents static electricity buildup in traditional fabrics under high humidity conditions, thereby improving the fabric's safety and comfort during daily wear.

[0012] Preferably, the humidity-regulating layer is prepared as follows:

[0013] a) Mix polyvinyl alcohol solution with polyurethane emulsion, add calcium chloride to obtain a preliminary solution;

[0014] b) Coat the surface of a cold plate at -20 to -30°C with the solution to form a wet film and maintain the temperature of the cold plate while immediately directional freezing, and then perform three freeze-thaw cycles;

[0015] c) Add glutaraldehyde and boric acid in the second molten state, and then freeze for the third time;

[0016] d) After the third freezing and thawing, heat and air dry to cure, and then wash and dry.

[0017] By precisely controlling the membrane structure changes during freezing and thawing, a humidity-regulating layer structure with a gradient pore size distribution was achieved. The addition of glutaraldehyde and boric acid crosslinking agents not only enhances the membrane's structural stability but also improves its moisture resistance and durability, preventing deformation or damage to traditional membrane materials during long-term use.

[0018] Preferably, the core-sheath type conductive filament is treated in a 40-60kV corona field for 4-8 seconds after spinning.

[0019] Corona treatment enhances the adhesion between the conductive filaments and other layers through surface polarization, while also improving the conductivity of the conductive web layer. This treatment helps maintain the stability and consistency of the conductive web layer, ensuring the fabric's efficient antistatic function under varying humidity conditions.

[0020] Preferably, the angle between the conductive filaments in the conductive mesh layer and the warp direction of the polyester matrix layer is 45°±5°.

[0021] By rationally controlling the crossing angle between the conductive filaments and the base fabric layer, the distribution of the conductive path is optimized, enhancing the uniformity and stability of the fabric's conductivity. This design improves antistatic properties and allows the fabric to maintain constant electrical resistance under different humidity environments.

[0022] Preferably, the diameter of each adhesive dot in the discrete adhesive layer is 200-400 μm, and the center-to-center distance between adjacent adhesive dots is 1.5-2.0 mm.

[0023] The dotted adhesive dots and their specific spacing avoid the moisture permeability reduction problem caused by continuous coating of traditional adhesive layers. While ensuring stable adhesion between layers, it retains good breathability and comfort, improving the overall functionality and comfort of the fabric.

[0024] Preferably, the mass fraction of calcium chloride increases from 10-15 wt% to 35-40 wt% along the thickness direction of the moisture-conditioning layer.

[0025] By gradually increasing the mass fraction of calcium chloride, different humidity response zones are created within the moisture-regulating layer, enhancing its moisture absorption capacity and water vapor conductivity. This design effectively improves the fabric's humidity regulation performance under different environmental conditions, exhibiting strong environmental adaptability.

[0026] Preferably, the mesh spacing of the conductive mesh layer is 3.5 to 4.5 mm.

[0027] By rationally designing the mesh spacing, the stability of the conductive network is ensured, while the softness and comfort of the fabric are enhanced. Optimizing the mesh spacing allows the fabric to effectively prevent static electricity buildup without compromising its everyday comfort.

[0028] Preferably, the resistance change of the fabric after 50 cycles at a relative humidity of 30% to 90% does not exceed 0.2 logΩ.

[0029] A method for preparing an antistatic humidity-regulating polyester composite fabric includes the following steps:

[0030] S1: Weave plain weave polyester filament fabric to obtain the polyester matrix weave layer;

[0031] S2: Mix polyvinyl alcohol aqueous solution and polyurethane emulsion, add calcium chloride, and perform three freeze-thaw cycles at -25℃ / 20℃ to obtain a moisture-conditioning layer.

[0032] S3: Core-sheath type conductive filaments are obtained by melt composite spinning and woven into a conductive mesh layer;

[0033] S4: The polyester base fabric layer, the moisture conditioning layer and the conductive mesh layer are stacked in sequence, and the acrylic adhesive is coated on one side of the polyester base fabric layer in a dot matrix pattern using a photomask to form the discrete adhesive layer;

[0034] S5: Hot-press at 120-150℃ and 0.2-0.4MPa for 20-40s, and cure the adhesive by irradiation with 365nm ultraviolet light during or after hot pressing.

[0035] S6: The finished fabric is obtained by heat setting at 170℃ for 60-90 seconds and then cooling.

[0036] Preferably, the freeze-thaw cycle time in step S2 is controlled to be 2-3 hours, and the side of the adjustment layer that is connected to the polyester matrix fabric is the frozen side, while the side away from the polyester matrix fabric is sealed.

[0037] The above-described preparation process allows for precise control of the composition and structure of each layer, ensuring good bonding between layers and the overall functionality of the final fabric. The moisture-regulating layer prepared by combining freeze-thaw cycles and crosslinking agents not only provides efficient humidity regulation but also ensures the stability and durability of the film; while the hot-pressing and photocuring processes guarantee precise bonding and lasting effect of the discrete adhesive layers.

[0038] Compared with the prior art, the beneficial effects of the present invention are mainly reflected in the following aspects:

[0039] 1. By constructing a gradient structure in which the mass fraction of calcium chloride and the pore size increase simultaneously along the film thickness direction, the moisture absorption capacity and water vapor directional diffusion efficiency of the moisture-regulating layer are significantly enhanced, which helps to improve the moisture-regulating response and dryness experience of the fabric in dynamic humidity environments.

[0040] 2. The conductive mesh layer uses core-sheath type conductive filaments that have undergone corona treatment. Combined with reasonable mesh spacing control and weaving angle design, a conductive network with uniform conductive path and good interface bonding is constructed, which ensures the resistance stability of the fabric under high humidity fluctuation conditions and has good antistatic performance retention capability.

[0041] 3. The discrete dot adhesive layer is precisely applied using a photomask and combined with a heat-light dual curing process, achieving a balance between interlayer bonding strength and overall fabric moisture permeability, effectively improving the fabric's wearing comfort and interlayer stability. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the embodiments.

[0043] Example 1

[0044] This embodiment discloses a method for preparing an antistatic humidity-regulating polyester composite fabric, including the following steps:

[0045] S1: Woven polyester base layer

[0046] Polyester filament (polyethylene terephthalate, PET, linear density 75D / 36F) produced by Zhejiang Hengchao Chemical Fiber Co., Ltd. is woven into a plain weave fabric on a water jet loom with a fabric density of 130g / m². 2 It serves as the polyester matrix weave layer.

[0047] S2: Preparation of humidity-regulating layer

[0048] Raw material composition and proportions (mass percentage):

[0049] Polyvinyl alcohol (PVA, molecular weight approximately 88,000, partially hydrolyzed, supplier: Anhui Huaheng Biotechnology Co., Ltd.): 10%

[0050] Waterborne polyurethane emulsion (solid content 30%, grade: PU-301, supplier: Zhejiang Yiyang New Material Co., Ltd.): 15%

[0051] Anhydrous calcium chloride (analytical grade, supplier: Zhejiang Ensheng Dyestuff Chemical Co., Ltd.): 15%

[0052] Glutaraldehyde solution (25wt%, supplier: Shanghai Ligotech Co., Ltd.): 2%

[0053] Boric acid (analytical grade, supplier: Shanghai Ligotech Co., Ltd.): 1%

[0054] Replenish deionized water to 100%.

[0055] Process steps:

[0056] a) Dissolve polyvinyl alcohol in deionized water at 90°C to prepare a 10% aqueous solution. After cooling to room temperature, add polyurethane emulsion and stir to mix evenly.

[0057] b) Add calcium chloride powder and stir until completely dissolved to obtain a uniformly dispersed precursor solution;

[0058] c) The obtained solution was coated on an aluminum cold plate at -25℃ using a film scraper, with the thickness controlled at 25μm, and immediately frozen to form a wet film;

[0059] d) Place the coated freeze-thawed film in an environment of 25°C to thaw naturally, completing one freeze-thaw cycle. Repeat this process 3 times, with each freeze-thaw cycle lasting 2.5 hours.

[0060] e) Add a mixture of glutaraldehyde and boric acid (mass ratio 2:1) during the second melting stage, spray it evenly, and then freeze it for the third time.

[0061] f) After the third melting, place it in a forced-air drying oven at 60°C for 10 hours to air dry and cure, thus obtaining a porous humidity-regulating membrane layer with a gradient pore structure.

[0062] S3: Fabrication of conductive mesh layer

[0063] The core-sheath type conductive filament (model NCF-100) produced by Suzhou Naxinwei Technology Co., Ltd. has an outer PET layer and an inner core of carbon nanotube composite conductive material. The single filament diameter is approximately 20μm, and the resistivity is less than 1×10⁻⁶. -3 The wires (Ω·cm) are woven on a loom to form a diamond-shaped mesh structure with a mesh spacing of 4.0mm and an angle of 45° between the conductive wires and the warp yarns of the base layer.

[0064] After weaving, the conductive mesh layer is placed in a corona discharge device and treated with a voltage of 50kV for 6 seconds to enhance surface activity and adhesion.

[0065] S4: Formation of discrete adhesive layer

[0066] Using photothermal dual-curing acrylic adhesive (model: JRI-UV-306) provided by Zhejiang Jiuri New Material Technology Co., Ltd., a dot matrix photomask mold was used to apply the adhesive dots on one side of the polyester substrate fabric by inkjet printing, forming adhesive dots with a diameter of 300μm, a center-to-center distance of 1.8mm, and an area ratio of adhesive dots to non-adhesive areas of 12%.

[0067] Then, the humidity regulating layer and the conductive mesh layer are stacked on top of the substrate fabric layer in sequence, and the three-layer structure is positioned and pressed together.

[0068] The adhesive is hot-pressed at 130°C and 0.3MPa for 30 seconds in a hot press, and then cured by irradiation with 365nm ultraviolet light for 10 minutes to form a stable discrete adhesive layer.

[0069] S5: Heat setting and cooling

[0070] The composite fabric is treated at 170°C for 80 seconds in a heat setting machine to set its size and shape, and then naturally cooled to room temperature to obtain the finished antistatic and humidity-regulating polyester composite fabric.

[0071] Example 2

[0072] This embodiment discloses a method for preparing an antistatic humidity-regulating polyester composite fabric, including the following steps:

[0073] S1: Woven polyester base layer

[0074] Polyester filament (polyethylene terephthalate, PET, linear density 75D / 36F) produced by Zhejiang Hengchao Chemical Fiber Co., Ltd. is woven into a plain weave fabric on a water jet loom with a fabric density of 130g / m². 2 It serves as the polyester matrix weave layer.

[0075] S2: Preparation of humidity-regulating layer

[0076] Raw material composition and proportions (mass percentage):

[0077] Polyvinyl alcohol (PVA, molecular weight approximately 88,000, partially hydrolyzed, supplier: Anhui Huaheng Biotechnology Co., Ltd.): 8%

[0078] Waterborne polyurethane emulsion (solid content 30%, grade: PU-301, supplier: Zhejiang Yiyang New Material Co., Ltd.): 20%

[0079] Anhydrous calcium chloride (analytical grade, supplier: Zhejiang Ensheng Dyestuff Chemical Co., Ltd.): 20%

[0080] Glutaraldehyde solution (25wt%, supplier: Shanghai Ligotech Co., Ltd.): 1.5%

[0081] Boric acid (analytical grade, supplier: Shanghai Ligotech Co., Ltd.): 0.5%

[0082] Replenish deionized water to 100%.

[0083] Process steps:

[0084] a) Dissolve polyvinyl alcohol in deionized water at 90°C to prepare a 10% aqueous solution. After cooling to room temperature, add polyurethane emulsion and stir to mix evenly.

[0085] b) Add calcium chloride powder and stir until completely dissolved to obtain a uniformly dispersed precursor solution;

[0086] c) The obtained solution was coated on an aluminum cold plate at -25℃ using a film scraper, with the thickness controlled at 30μm, and immediately frozen to form a wet film;

[0087] d) Place the coated freeze-thawed film in an environment of 25°C to thaw naturally, completing one freeze-thaw cycle. Repeat this process 3 times, with each freeze-thaw cycle lasting 2.5 hours.

[0088] e) Add a mixture of glutaraldehyde and boric acid (mass ratio 3:1) during the second melting stage, spray it evenly, and then freeze it for the third time.

[0089] f) After the third melting, place it in a forced-air drying oven at 60°C for 10 hours to air dry and cure, thus obtaining a porous humidity-regulating membrane layer with a gradient pore structure.

[0090] S3: Fabrication of conductive mesh layer

[0091] The conductive filaments (model NCF-100, outer PET, inner carbon nanotube composite conductive material, single filament diameter of about 20μm, resistivity of less than 1×10-3Ω·cm) produced by Suzhou Naxinwei Technology Co., Ltd. are used to form a conductive mesh layer by weaving, with the mesh spacing controlled at 3.5mm.

[0092] After weaving, the conductive mesh layer is placed in a corona discharge device and treated with a voltage of 50kV for 6 seconds to enhance surface activity and adhesion.

[0093] S4: Formation of discrete adhesive layer

[0094] Using photothermal dual-curing acrylic adhesive (model: JRI-UV-306) provided by Zhejiang Jiuri New Material Technology Co., Ltd., a dot matrix photomask mold was used to apply the adhesive dots on one side of the polyester substrate fabric by inkjet printing, forming adhesive dots with a diameter of 250μm, a center-to-center distance of 1.6mm, and an area ratio of adhesive dots to non-adhesive areas of 12%.

[0095] Then, the humidity regulating layer and the conductive mesh layer are stacked on top of the substrate fabric layer in sequence, and the three-layer structure is positioned and pressed together.

[0096] The adhesive is hot-pressed at 130°C and 0.3MPa for 30 seconds in a hot press, and then cured by irradiation with 365nm ultraviolet light for 10 minutes to form a stable discrete adhesive layer.

[0097] S5: Heat setting and cooling

[0098] The composite fabric is treated at 170°C for 70 seconds in a heat setting machine to set its size and shape, and then naturally cooled to room temperature to obtain the finished antistatic and humidity-regulating polyester composite fabric.

[0099] Example 3

[0100] This embodiment discloses a method for preparing an antistatic humidity-regulating polyester composite fabric, including the following steps:

[0101] S1: Woven polyester base layer

[0102] Polyester filament (polyethylene terephthalate, PET, linear density 75D / 36F) produced by Zhejiang Hengchao Chemical Fiber Co., Ltd. is woven into a plain weave fabric on a water jet loom with a fabric density of 130g / m². 2 It serves as the polyester matrix weave layer.

[0103] S2: Preparation of humidity-regulating layer

[0104] Raw material composition and proportions (mass percentage):

[0105] Polyvinyl alcohol (PVA, molecular weight approximately 88,000, partially hydrolyzed, supplier: Anhui Huaheng Biotechnology Co., Ltd.): 12%

[0106] Waterborne polyurethane emulsion (solid content 30%, grade: PU-301, supplier: Zhejiang Yiyang New Material Co., Ltd.): 12%

[0107] Anhydrous calcium chloride (analytical grade, supplier: Zhejiang Ensheng Dyestuff Chemical Co., Ltd.): 12%

[0108] Glutaraldehyde solution (25wt%, supplier: Shanghai Ligotech Co., Ltd.): 2.5%

[0109] Boric acid (analytical grade, supplier: Shanghai Ligotech Co., Ltd.): 1.5%

[0110] Replenish deionized water to 100%.

[0111] Process steps:

[0112] a) Dissolve polyvinyl alcohol in deionized water at 90°C to prepare a 10% aqueous solution. After cooling to room temperature, add polyurethane emulsion and stir to mix evenly.

[0113] b) Add calcium chloride powder and stir until completely dissolved to obtain a uniformly dispersed precursor solution;

[0114] c) The obtained solution was coated on an aluminum cold plate at -25℃ using a film scraper, with the thickness controlled at 20μm, and immediately frozen to form a wet film;

[0115] d) Place the coated freeze-thawed film in an environment of 25°C to thaw naturally, completing one freeze-thaw cycle. Repeat this process 3 times, with each freeze-thaw cycle lasting 2 hours.

[0116] e) Add a mixture of glutaraldehyde and boric acid (mass ratio 5:3) during the second melting stage, spray it evenly, and then freeze it for the third time.

[0117] f) After the third melting, place it in a forced-air drying oven at 60°C for 8 hours to air dry and cure, thus obtaining a porous humidity-regulating membrane layer with a gradient pore structure.

[0118] S3: Fabrication of conductive mesh layer

[0119] The conductive filaments (model NCF-100, outer PET, inner carbon nanotube composite conductive material, single filament diameter of about 20μm, resistivity of less than 1×10-3Ω·cm) produced by Suzhou Naxinwei Technology Co., Ltd. are used to form a conductive mesh layer by weaving, with the mesh spacing controlled at 4.5mm.

[0120] After weaving, the conductive mesh layer is placed in a corona discharge device and treated with a voltage of 50kV for 6 seconds to enhance surface activity and adhesion.

[0121] S4: Formation of discrete adhesive layer

[0122] Using photothermal dual-curing acrylic adhesive (model: JRI-UV-306) provided by Zhejiang Jiuri New Material Technology Co., Ltd., a dot matrix photomask mold was used to apply the adhesive dots on one side of the polyester substrate fabric by inkjet printing, forming adhesive dots with a diameter of 400μm, a center-to-center distance of 2.0mm, and an area ratio of adhesive dots to non-adhesive areas of 15%.

[0123] Then, the humidity regulating layer and the conductive mesh layer are stacked on top of the substrate fabric layer in sequence, and the three-layer structure is positioned and pressed together.

[0124] The adhesive is hot-pressed at 130°C and 0.3MPa for 40 seconds in a hot press, and then cured by irradiation with 365nm ultraviolet light for 10 minutes to form a stable discrete adhesive layer.

[0125] S5: Heat setting and cooling

[0126] The composite fabric is treated at 170℃ for 90 seconds in a heat setting machine to set its size and shape, and then naturally cooled to room temperature to obtain the finished antistatic and humidity-regulating polyester composite fabric.

[0127] Comparative Example 1

[0128] This comparative example discloses a method for preparing a composite fabric, including the following steps:

[0129] S1: Woven polyester base layer

[0130] Polyester filament (polyethylene terephthalate, PET, linear density 75D / 36F) produced by Zhejiang Hengchao Chemical Fiber Co., Ltd. is woven into a plain weave fabric on a water jet loom with a fabric density of 130g / m². 2 It serves as the polyester matrix weave layer.

[0131] S2: Preparation of humidity-regulating layer

[0132] Raw material composition and proportions (mass percentage):

[0133] Polyvinyl alcohol (PVA, molecular weight approximately 88,000, partially hydrolyzed, supplier: Anhui Huaheng Biotechnology Co., Ltd.): 10%

[0134] Waterborne polyurethane emulsion (solid content 30%, grade: PU-301, supplier: Zhejiang Yiyang New Material Co., Ltd.): 15%

[0135] No added calcium chloride

[0136] Glutaraldehyde solution (25wt%, supplier: Shanghai Ligotech Co., Ltd.): 2%

[0137] Boric acid (analytical grade, supplier: Shanghai Ligotech Co., Ltd.): 1%

[0138] Replenish deionized water to 100%.

[0139] Process steps:

[0140] a) Dissolve polyvinyl alcohol in deionized water at 90°C to prepare a 10% aqueous solution. After cooling to room temperature, add polyurethane emulsion and stir to mix evenly.

[0141] b) Without adding calcium chloride, continue stirring until homogeneous to obtain the precursor solution;

[0142] c) The obtained solution was coated on an aluminum cold plate at -25℃ using a film scraper, with the thickness controlled at 25μm, and immediately frozen to form a wet film;

[0143] d) Place the coated freeze-thawed film in an environment of 25°C to thaw naturally, completing one freeze-thaw cycle. Repeat this process 3 times, with each freeze-thaw cycle lasting 2.5 hours.

[0144] e) Add a mixture of glutaraldehyde and boric acid (mass ratio 2:1) during the second melting stage, spray it evenly, and then freeze it for the third time.

[0145] f) After the third melting, place it in a forced-air drying oven at 60°C for 10 hours to air dry and cure, thus obtaining a porous humidity-regulating film layer.

[0146] S3: Fabrication of conductive mesh layer

[0147] The conductive filaments (model NCF-100, outer PET, inner carbon nanotube composite conductive material, single filament diameter of about 20μm, resistivity of less than 1×10-3Ω·cm) produced by Suzhou Naxinwei Technology Co., Ltd. are used to form a conductive mesh layer by weaving, with the mesh spacing controlled at 4.0mm.

[0148] After weaving, the conductive mesh layer is placed in a corona discharge device and treated with a voltage of 50kV for 6 seconds to enhance surface activity and adhesion.

[0149] S4: Formation of discrete adhesive layer

[0150] Using photothermal dual-curing acrylic adhesive (model: JRI-UV-306) provided by Zhejiang Jiuri New Material Technology Co., Ltd., a dot matrix photomask mold was used to apply the adhesive dots on one side of the polyester substrate fabric by inkjet printing, forming adhesive dots with a diameter of 300μm, a center-to-center distance of 1.8mm, and an area ratio of adhesive dots to non-adhesive areas of 12%.

[0151] Then, the humidity regulating layer and the conductive mesh layer are stacked on top of the substrate fabric layer in sequence, and the three-layer structure is positioned and pressed together.

[0152] The adhesive is hot-pressed at 130°C and 0.3MPa for 30 seconds in a hot press, and then cured by irradiation with 365nm ultraviolet light for 10 minutes to form a stable discrete adhesive layer.

[0153] S5: Heat setting and cooling

[0154] The composite fabric was treated at 170°C for 80 seconds in a heat setter to set its size and shape, and then naturally cooled to room temperature to obtain a comparative sample.

[0155] Comparative Example 2

[0156] S1: Woven polyester base layer

[0157] Polyester filament (polyethylene terephthalate, PET, linear density 75D / 36F) produced by Zhejiang Hengchao Chemical Fiber Co., Ltd. is woven into a plain weave fabric on a water jet loom with a fabric density of 130g / m². 2 It serves as the polyester matrix weave layer.

[0158] S2: Preparation of humidity-regulating layer

[0159] Raw material composition and proportions (mass percentage):

[0160] Polyvinyl alcohol (PVA, molecular weight approximately 88,000, partially hydrolyzed, supplier: Anhui Huaheng Biotechnology Co., Ltd.): 10%

[0161] Waterborne polyurethane emulsion (solid content 30%, grade: PU-301, supplier: Zhejiang Yiyang New Material Co., Ltd.): 15%

[0162] Anhydrous calcium chloride (analytical grade, supplier: Zhejiang Ensheng Dyestuff Chemical Co., Ltd.): 15%

[0163] Glutaraldehyde solution (25wt%, supplier: Shanghai Ligotech Co., Ltd.): 2%

[0164] Boric acid (analytical grade, supplier: Shanghai Ligotech Co., Ltd.): 1%

[0165] Replenish deionized water to 100%.

[0166] Process steps:

[0167] a) The raw material mixing method is the same as in Example 1;

[0168] b) The obtained solution was directly and uniformly coated onto the polytetrafluoroethylene material using a room temperature spin coating process, with the thickness controlled at 25 μm;

[0169] c) Instead of freezing and thawing, the material is directly dried in a forced-air drying oven at 60°C for 10 hours to form a moisture-conditioning film.

[0170] S3: Fabrication of conductive mesh layer

[0171] The core-sheath type conductive filament (model NCF-100) produced by Suzhou Naxinwei Technology Co., Ltd. has an outer PET layer and an inner core of carbon nanotube composite conductive material. The single filament diameter is approximately 20μm, and the resistivity is less than 1×10⁻⁶. -3 The wires (Ω·cm) are woven on a loom to form a diamond-shaped mesh structure with a mesh spacing of 4.0mm and an angle of 45° between the conductive wires and the warp yarns of the base layer.

[0172] After weaving, the conductive mesh layer is placed in a corona discharge device and treated with a voltage of 50kV for 6 seconds to enhance surface activity and adhesion.

[0173] S4: Formation of discrete adhesive layer

[0174] Using photothermal dual-curing acrylic adhesive (model: JRI-UV-306) provided by Zhejiang Jiuri New Material Technology Co., Ltd., a dot matrix photomask mold was used to apply the adhesive dots on one side of the polyester substrate fabric by inkjet printing, forming adhesive dots with a diameter of 300μm, a center-to-center distance of 1.8mm, and an area ratio of adhesive dots to non-adhesive areas of 12%.

[0175] Then, the humidity regulating layer and the conductive mesh layer are stacked on top of the substrate fabric layer in sequence, and the three-layer structure is positioned and pressed together.

[0176] The adhesive is hot-pressed at 130°C and 0.3MPa for 30 seconds in a hot press, and then cured by irradiation with 365nm ultraviolet light for 10 minutes to form a stable discrete adhesive layer.

[0177] S5: Heat setting and cooling

[0178] The composite fabric is treated at 170°C for 80 seconds in a heat setting machine to set its size and shape, and then naturally cooled to room temperature to obtain the finished antistatic and humidity-regulating polyester composite fabric.

[0179] Performance testing

[0180] 1. Humidity regulation performance test

[0181] Standard referenced: GB / T 24249-2009 Evaluation Methods for Electrostatic Properties of Textiles

[0182] Operating steps:

[0183] The sample was placed in a constant temperature and humidity test chamber, and the RH was set to 30%, 50%, 70%, and 90% respectively, with 10 cycles for each setting, for a total of 40 cycles;

[0184] Record the surface resistance after each humidity change and measure it using a surface resistance tester;

[0185] The difference between the logarithmic values ​​of the maximum and minimum resistances is the "humidity regulation resistance change".

[0186] 2. Moisture permeability test

[0187] Method Name: Water Vapor Transmission Rate (WVTR) Test

[0188] Standard based on: ASTM E96-00 (wet cup method)

[0189] Operating steps:

[0190] Load the sample onto the wet cup device, add water to the cup, and seal it tightly.

[0191] Place the device in an environment of 23°C and 50% RH.

[0192] Weigh the sample every hour for 6 consecutive hours, and calculate the moisture permeability rate in g / m³. 2 ·h.

[0193] 3. Electrostatic protection performance testing

[0194] Method Name: Surface Resistance Testing Method

[0195] Standard based on: GB / T 12703.1-2020

[0196] Operating steps:

[0197] The samples were pretreated for 2 hours each at 23℃, 30%, 60%, and 90% RH.

[0198] Surface resistance is tested using a resistance tester (such as ZC90E);

[0199] Record the resistance value under each humidity environment to determine whether it can maintain 10 ohms under high humidity conditions. 5 Below Ω.

[0200] 4. Mechanical property testing

[0201] Method Name: Tensile Strength and Tear Strength Test

[0202] Standards: GB / T 3923.1-2013 (Tension), GB / T 3917.2-2009 (Tear)

[0203] Operating steps:

[0204] Using an electronic universal testing machine, the sample was cut to a size of 25mm × 150mm;

[0205] The tensile rate was set to 300 mm / min, and the breaking strength and elongation were recorded.

[0206] The tear test was performed using a spring-loaded tear tester, and the tear strength was recorded.

[0207] 5. Wear resistance retention test

[0208] Method Name: Martindale Abrasion Resistance Test

[0209] Standard based on: GB / T 21196.2-2007

[0210] Operating steps:

[0211] The samples were loaded into the Martindale abrasion tester, with a standard wool cloth used as a friction comparison sample;

[0212] The wear cycle is set to 30,000 times;

[0213] After completion, the surface resistance was retested, and the change in resistance (logΩ change value) was calculated.

[0214] The test results are shown in Table 1 below.

[0215] Table 1

[0216]

[0217] 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 principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing an antistatic humidity-regulating polyester composite fabric, characterized in that, The antistatic humidity-regulating polyester composite fabric comprises, from the inside out: Polyester base fabric; The humidity-regulating layer is a porous membrane of polyvinyl alcohol and polyurethane interpenetrating network with a thickness of 15-40 µm. The pore size increases along the thickness direction of the membrane towards the side away from the polyester matrix. It contains 10-40 wt% calcium chloride, and its mass fraction increases along the thickness direction of the membrane towards the side away from the polyester matrix. The conductive mesh layer is woven from core-sheath type conductive filaments; The discrete adhesive layer is a dot-shaped thermo-curable acrylic adhesive, with the area ratio of adhesive dots to non-adhesive areas not exceeding 15%. The preparation method includes the following steps: S1: Weave plain weave polyester filament fabric to obtain the polyester matrix weave layer; S2: Mix polyvinyl alcohol aqueous solution and polyurethane emulsion, add calcium chloride, and perform three freeze-thaw cycles at -25℃ / 20℃ to obtain a moisture-conditioning layer. S3: Core-sheath type conductive filaments are obtained by melt composite spinning and woven into a conductive mesh layer; S4: The polyester base fabric layer, the moisture conditioning layer and the conductive mesh layer are stacked in sequence, and the acrylic adhesive is coated on one side of the polyester base fabric layer in a dot matrix pattern using a photomask to form the discrete adhesive layer; S5: Hot-press at 120-150℃ and 0.2-0.4MPa for 20-40s, and cure the adhesive by irradiation with 365nm ultraviolet light during or after hot pressing. S6: The finished fabric is obtained by heat setting at 170℃ for 60-90 seconds and then cooling. The method for preparing the humidity-regulating layer is as follows: a) Mix polyvinyl alcohol solution with polyurethane emulsion, add calcium chloride to obtain a preliminary solution; b) Apply the preliminary solution to the surface of a cold plate at -25°C to form a wet film and maintain the temperature of the cold plate while immediately performing directional freezing, followed by three freeze-thaw cycles; c) Add glutaraldehyde and boric acid in the second molten state, and then freeze for the third time; d) After the third freezing and thawing, heat and air dry to cure, and then wash and dry.

2. The method for preparing an antistatic humidity-regulating polyester composite fabric according to claim 1, characterized in that, The core-sheath type conductive filament is treated in a 40-60kV corona field for 4-8 seconds after spinning.

3. The method for preparing an antistatic humidity-regulating polyester composite fabric according to claim 1, characterized in that, The angle between the conductive filaments in the conductive mesh layer and the warp direction of the polyester matrix layer is 45°±5°.

4. The method for preparing an antistatic humidity-regulating polyester composite fabric according to claim 1, characterized in that, The diameter of each adhesive dot in the discrete adhesive layer is 200–400 µm, and the center-to-center distance between adjacent adhesive dots is 1.5–2.0 mm.

5. The method for preparing an antistatic humidity-regulating polyester composite fabric according to claim 1, characterized in that, The mass fraction of calcium chloride increases from 10-15 wt% to 35-40 wt% along the thickness direction of the humidity-regulating layer.

6. The method for preparing an antistatic humidity-regulating polyester composite fabric according to claim 1, characterized in that, The spacing between the conductive mesh layers is 3.5 to 4.5 mm.

7. The method for preparing an antistatic humidity-regulating polyester composite fabric according to claim 1, characterized in that, The resistance change of the fabric does not exceed 0.2 logΩ after 50 cycles at a relative humidity of 30% to 90%.

8. The method for preparing an antistatic humidity-regulating polyester composite fabric according to claim 1, characterized in that, In step S2, the freeze-thaw cycle time is controlled to be 2-3 hours, and the side of the moisture-conditioning layer that is connected to the polyester matrix fabric is the frozen side, while the side away from the polyester matrix fabric is sealed.

Images