Moisture-absorbing and mildew-proof composite fabric and storage bag

Abstract

The invention discloses a moisture-absorbing and mildew-proof composite fabric and a storage bag. The composite fabric sequentially comprises a hydrophobic outer layer, a functional middle layer and a breathable supporting bottom layer from outside to inside. The hydrophobic outer layer is made of woven fabric subjected to hydrophobic treatment and is configured to guide moisture to permeate into the inner layer and block liquid; the functional middle layer is made of a porous fiber filling material loaded with a functional agent, and the functional agent comprises a moisture absorbent, a mildew preventive and an antibacterial agent and is configured to directionally absorb and lock moisture; the breathable supporting bottom layer is made of breathable non-woven fabric and is configured to evenly disperse moisture and support the protective function middle layer. The invention further discloses a preparation method of the composite fabric. The preparation method comprises the steps of functional agent compounding, porous fiber filling material pretreatment and interlayer compounding. The invention further discloses a storage bag made of the composite fabric. Through the function cooperation of the laminated structure, the moisture-proof, mildew-proof and antibacterial functions are integrated, and the protection effect is lasting.

Description

Technical Field

[0001] This invention belongs to the field of composite fabric technology, specifically a moisture-wicking and mildew-resistant composite fabric and storage bag. Background Technology

[0002] With the improvement of people's living standards and the upgrading of consumption concepts, the demand for household storage is increasing day by day. Storage bags, as a common household item, are widely used for storing clothing, bedding, shoes and other items. However, in actual use, stored items are kept in a relatively closed environment for a long time, which makes them susceptible to the effects of humid air, leading to problems such as mold, odor, and bacterial growth. This problem is particularly prominent in the rainy season in the south or in coastal areas with high humidity, seriously affecting the quality and lifespan of the stored items.

[0003] Currently, the most common moisture-proof storage solutions on the market are as follows: The first is to place an individual desiccant packet inside the storage bag, such as silica gel desiccant or calcium chloride desiccant. Although this method can absorb moisture to some extent, the desiccant needs to be replaced regularly, and users cannot easily determine whether the desiccant has expired, which can easily lead to the loss of protection without their knowledge. The second is to use vacuum compression bags, which reduce the moisture content by removing air from the bag. However, vacuum bags have high requirements for airtightness. Once the seal fails, the protective ability is completely lost, and repeated vacuuming is cumbersome. Some soft clothing is also prone to wrinkles after vacuum compression. The third is to use plastic film bags with certain barrier properties. However, these bags have poor air permeability, and the internal moisture cannot be effectively discharged. Instead, it is easy to form local condensation, which increases the risk of mold.

[0004] In the textile fabric field, multilayer composite structures have been widely used in the development of functional fabrics. For example, existing technologies include multilayer composite fabrics for chemical protective clothing, which achieve the barrier against chemical substances by setting up layers with different functions; there are also waterproof and breathable fabrics for outdoor clothing, which achieve unidirectional water vapor transmission through microporous membranes or hydrophilic membranes. However, these existing technologies are mainly designed for human wear scenarios, and their technical objectives, material selection, and structural design differ significantly from the application requirements of storage bags.

[0005] Regarding fiber loading technology for functional finishing agents, existing technologies disclose methods for loading functional substances such as antibacterial agents and antifungal agents onto the surface or interior of fibers. However, these technologies are mostly developed for single functions and lack a systematic solution that integrates multiple functions such as moisture absorption, antifungal properties, and antibacterial properties. In addition, existing functional agent loading technologies are mostly applied to clothing fabrics or medical textiles, and there are few technical solutions optimized for the specific application scenario of storage bags.

[0006] Therefore, how to develop a composite fabric that can achieve active moisture-proof, mildew-proof, and antibacterial functions from the material structure level, and apply it to storage bag products to give the storage bags durable and efficient multi-protection capabilities, while reducing the user's usage threshold and maintenance costs, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] In view of the technical problems of existing storage bags, such as poor moisture and mildew prevention, reliance on external desiccants, and inconvenience in use and maintenance, this invention provides a moisture-absorbing and mildew-proof composite fabric and storage bag. By designing a layered composite structure with specific functional division, the moisture-absorbing, mildew-proof, and antibacterial functions are integrated into the fabric itself, so as to achieve active and long-lasting protection for stored items.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A moisture-wicking and mildew-resistant composite fabric comprises, from the outside in, a hydrophobic outer layer, a functional middle layer, and a breathable support bottom layer, forming a layered composite structure through interlayer bonding.

[0009] The hydrophobic outer layer is made of a hydrophobically treated woven fabric. This woven fabric possesses good abrasion resistance and mechanical strength, making it suitable as the outer surface material of the storage bag. Preferably, the woven fabric is Oxford cloth, polyester cloth, nylon cloth, or canvas. Oxford cloth, after being hydrophobically treated, forms a hydrophobic film layer on its surface, effectively blocking the penetration of liquids (such as liquid water) and preventing external liquids from wetting the stored items. Simultaneously, the hydrophobic outer layer selectively allows the passage of gaseous water molecules, guiding moisture from the environment to permeate into the inner layer, where it is captured and absorbed by the functional intermediate layer, rather than condensing on the outer surface. This "liquid-resistant and breathable" characteristic of the hydrophobic outer layer lays the foundation for moisture control of the overall fabric.

[0010] The functional intermediate layer uses a porous fiber filling material loaded with functional agents. This porous fiber filling material is lightweight, fluffy, and has large fiber gaps, providing ample loading space and dispersion carrier for the functional agents. Preferably, the porous fiber filling material is PP cotton, polyester cotton, ES composite fiber, or hollow fiber cotton. PP cotton, specifically polypropylene fiber cotton, provides sufficient loading space and dispersion carrier for the functional agents. The functional agents include three components: a hygroscopic agent, a mildew inhibitor, and an antibacterial agent. These three components work synergistically to respectively absorb and lock in moisture, inhibit mold growth, and control bacterial reproduction. When moisture enters the functional intermediate layer through the hydrophobic outer layer, the hygroscopic agent captures and locks the moisture molecules within the fiber structure of the porous fiber filling material, preventing further diffusion of moisture into the stored items; the mildew inhibitor inhibits the germination of mold spores and the growth of mycelia, blocking mold growth at its source; and the antibacterial agent disrupts the cell structure or metabolic processes of bacteria, preventing bacterial growth and reproduction in a humid environment. As the core functional layer of the overall fabric, the functional intermediate layer has achieved a technological upgrade from passive blocking to active control.

[0011] The breathable support bottom layer is made of breathable nonwoven fabric. This breathable nonwoven fabric has excellent breathability and mechanical support properties. The interconnected microporous structure between the fibers allows moisture absorbed by the functional intermediate layer to be evenly distributed in the bottom layer, preventing excessive moisture concentration in localized areas and thus protecting the product from failure. Preferably, the breathable nonwoven fabric is needle-punched nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, or hot-air nonwoven fabric. Simultaneously, the breathable support bottom layer is located between the functional intermediate layer and the stored items, providing physical isolation and cushioning protection to prevent direct contact between the functional agents and the stored items. Furthermore, the breathable support bottom layer is treated with antibacterial and anti-mildew agents, forming the final protective barrier facing the stored items.

[0012] The layered composite structure of this invention is not a simple superposition of the functions of each layer, but rather achieves functional synergy between the layers through structural design. Specifically, the hydrophobic outer layer, the functional middle layer, and the breathable support bottom layer together constitute a regulation system for the directional transfer and gradient distribution of moisture: the outer layer guides moisture in, the middle layer absorbs and locks in moisture, and the bottom layer evenly disperses residual moisture and provides a protective barrier. This synergistic mechanism of "guiding-absorbing-dispersing" allows the fabric to actively adjust its internal microclimate according to changes in ambient humidity without requiring additional maintenance from the user.

[0013] Furthermore, the woven fabric of the hydrophobic outer layer has a basis weight of 150-300 g / m². 2If the basis weight is too low, the mechanical strength will be insufficient, making it difficult to meet the durability requirements for repeated use of the storage bag; if the basis weight is too high, the fabric will be too heavy, affecting the softness and ease of folding and storage of the storage bag. The hydrophobic treatment uses silicone or fluorocarbon hydrophobic agents, with the amount of hydrophobic agent being 1-5% of the woven fabric weight. The silicone hydrophobic agents include, but are not limited to, hydroxyl silicone oil, methyl silicone oil, amino-modified silicone oil, hydrogen-containing silicone oil, polydimethylsiloxane emulsion, and silicone waterproofing agents (such as Dow Corning DC series, Wacker BS series, and other commercially available products). The fluorocarbon hydrophobic agents include, but are not limited to, perfluorooctyl ethyl acrylate copolymer, perfluorohexyl ethyl acrylate copolymer, and short-chain C6 fluorocarbon waterproofing agents. Silicone hydrophobic agents are lower in cost and more environmentally friendly, suitable for general protection needs; fluorocarbon hydrophobic agents offer superior hydrophobic effects and are suitable for enhanced protection needs in high-humidity environments.

[0014] Furthermore, the porous fiber filling material of the functional intermediate layer has a basis weight of 80-200 g / m³. 2 The thickness ranges from 3 to 15 mm. The basis weight and thickness of the porous fiber filling material directly affect the functional agent loading and moisture absorption capacity. If the basis weight and thickness are too low, the functional agent loading will be insufficient, limiting the fabric's moisture absorption and mildew prevention capabilities; if the basis weight and thickness are too high, the overall fabric thickness will increase, affecting the lightweight and cost-effectiveness of the storage bag. Within the above parameter range, the porous fiber filling material can achieve an effective functional agent loading while maintaining an appropriate fabric thickness.

[0015] Furthermore, the functional agents, by weight, include: 15-35 parts of desiccant, 5-15 parts of antifungal agent, and 3-12 parts of antibacterial agent. The ratio of the three functional agents has been optimized, with the desiccant having the highest proportion to meet the main needs of humidity control in storage scenarios; the antifungal agent and antibacterial agent have relatively lower proportions but work synergistically to further inhibit microbial growth on the basis of humidity control by the desiccant.

[0016] Furthermore, the desiccant is one or more of calcium chloride, silica gel, modified montmorillonite, and molecular sieves. Calcium chloride has strong moisture absorption capacity and low cost, but requires appropriate coating treatment to prevent deliquescence; silica gel is chemically stable and recyclable; the modified montmorillonite is organically modified montmorillonite or acid-activated modified montmorillonite, wherein the organically modified montmorillonite is obtained by intercalation modification of natural montmorillonite with quaternary ammonium salt cationic surfactants, and the acid-activated modified montmorillonite is obtained by acidification treatment of natural montmorillonite with hydrochloric acid or sulfuric acid; the molecular sieve is one or more of type 3A molecular sieve, type 4A molecular sieve, or type 13X molecular sieve, wherein type 4A molecular sieve has a large moisture absorption capacity and moderate cost, and is the preferred type. The antifungal agent is one or more of nano zinc oxide, calcium propionate, potassium sorbate, and isothiazolinone compounds. The isothiazolinone compounds include, but are not limited to, 2-methyl-4-isothiazolin-3-one (MIT), 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT), 1,2-benzisothiazolin-3-one (BIT), and their complexes. Nano-zinc oxide possesses photocatalytic antibacterial and antifungal properties with high safety; calcium propionate and potassium sorbate are food-grade antifungal agents suitable for contact with clothing; isothiazolinone compounds exhibit excellent broad-spectrum antibacterial and antifungal effects. The antibacterial agent is one or more combinations of nano-silver, chitosan, quaternary ammonium salt compounds, and organic guanidine compounds. The quaternary ammonium salt compounds include, but are not limited to, dodecyl dimethyl benzyl ammonium chloride, hexadecyl trimethyl ammonium bromide, and disedecyl dimethyl ammonium chloride. The organic guanidine compounds include, but are not limited to, polyhexamethylene guanidine hydrochloride (PHMG) and polyhexamethylene biguanide hydrochloride (PHMB). Nano-silver possesses broad-spectrum, highly efficient, and long-lasting antibacterial properties; chitosan is a natural polymeric antibacterial agent with good biocompatibility; quaternary ammonium salts and organic guanidine compounds achieve their antibacterial effects by disrupting bacterial cell membranes. The selection and combination of these functional agents can be flexibly adjusted according to specific application needs and cost requirements.

[0017] Furthermore, the breathable nonwoven fabric of the breathable support layer has a basis weight of 60-150 g / m². 2 The fibers have a diameter of 10-30μm and are treated with antibacterial and antifungal agents. The finer fiber diameter helps to form a uniform and dense microporous structure, improving the uniformity of moisture dispersion; the antibacterial and antifungal treatment gives the bottom layer not only support and protection but also direct antibacterial and antifungal capabilities, forming a composite protection.

[0018] The present invention also provides a method for preparing the above-mentioned moisture-wicking and mildew-resistant composite fabric, comprising the following steps: S1. Functional Agent Compounding: Mix the hygroscopic agent, mildew inhibitor, and antibacterial agent at a mass ratio of (15-35):(5-15):(3-12), add the dispersant, and stir at 300-800 rpm for 15-30 minutes until uniformly dispersed to obtain the compounded functional agent. The addition of the dispersant can improve the dispersion uniformity of each functional agent component in the solution, avoid the aggregation of functional agents, and ensure the uniformity of subsequent loading processes.

[0019] S2. Pretreatment of Porous Fiber Filler: The porous fiber filler is immersed in a compound functional agent solution for 10-60 minutes at a temperature of 40-80℃. After removal, it is dried at 80-120℃ for 1-4 hours to obtain the functional porous fiber filler. During the immersion process, the compound functional agent solution penetrates into the interfiber spaces of the porous fiber filler and adheres to the fiber surface. During the drying process, the solvent evaporates, and the functional agent solidifies in the fiber structure, forming a stable loading state. Appropriately increasing the immersion temperature helps to reduce the solution viscosity and accelerate penetration. The drying temperature and time need to be controlled according to the thermal stability of the functional agent to avoid loss of its activity.

[0020] S3. Interlayer Composite: A hydrophobic outer layer, a functional porous fiber filling material, and a breathable support bottom layer are stacked sequentially and interlayer composited using hot melt adhesive web bonding or ultrasonic pressing to obtain a moisture-wicking and mildew-resistant composite fabric. Hot melt adhesive web bonding and ultrasonic pressing are both mature composite processes that can ensure the interlayer bonding strength while preserving the original performance of each functional layer to the greatest extent.

[0021] Further, in step S1, the dispersant is one or more combinations of polyvinyl alcohol, sodium carboxymethyl cellulose, and polyethylene glycol, and the amount of dispersant used is 0.5-5% of the total mass of the compound functional agents. All of the above dispersants have good water solubility and dispersion stability, effectively preventing the functional agents from settling or agglomerating in the solution. In step S2, the concentration of the compound functional agent solution is 5-25 wt%, and the number of impregnations is 1-3. The solution concentration and the number of impregnations together determine the loading of the functional agent, which can be flexibly adjusted according to the target loading.

[0022] Furthermore, when hot melt adhesive film is used for bonding in step S3, the hot melt adhesive film is an environmentally friendly hot melt adhesive film with a thickness of 20-60 μm and a pore density of 100-500 pores / cm². 2 The bonding temperature is 100-150℃, the bonding pressure is 0.1-0.5MPa, and the bonding time is 5-30s. The environmentally friendly hot melt adhesive mesh does not release harmful substances during the bonding process, meeting the safety requirements for storage bag products. The mesh's porous structure ensures the breathability of the fabric after bonding, preventing the hot melt adhesive from forming a continuous film layer that blocks moisture transfer. When using ultrasonic pressing, the ultrasonic frequency is 15-40kHz, and the power density is 1-5W / cm³.2 The pressing speed is 3-15 m / min, and the pressing width is 1-5 mm. Ultrasonic pressing uses the frictional heat generated by high-frequency vibration to partially melt and interweave the fibers, achieving glue-free bonding and avoiding the use of chemical adhesives, thus further improving the environmental performance of the product.

[0023] This invention also provides a storage bag, the bag body of which is made of the aforementioned moisture-absorbing and mildew-resistant composite fabric. Because the bag itself possesses moisture-absorbing, mildew-resistant, and antibacterial functions, users do not need to place additional desiccant inside the bag to effectively protect stored items, significantly improving ease of use.

[0024] Furthermore, the storage bag also includes at least one of the following structures: a humidity indicator integrated into the bag body, a dual-channel sealing system, and a removable and replaceable functional insert located in the corner area of ​​the bag body.

[0025] The humidity indicator is made of cobalt chloride-based color-changing material or organic moisture-sensitive color-changing material. The cobalt chloride-based color-changing material is silica gel or filter paper impregnated with cobalt chloride, which is blue when dry and turns pink after absorbing moisture. The organic moisture-sensitive color-changing material includes, but is not limited to, moisture-sensitive inks containing azo dyes and moisture-sensitive coatings containing anthraquinone dyes, which can produce reversible color changes according to humidity changes. When the relative humidity inside the bag exceeds 60%, a noticeable color change occurs, allowing users to intuitively judge the humidity status inside the bag and the working condition of the fabric. When the humidity indicator shows that the humidity inside the bag exceeds a preset threshold, users can take measures such as ventilation and airing to intervene and achieve proactive management of the storage environment.

[0026] The dual-channel sealing system includes a sealing zipper and a one-way vent valve. The sealing zipper provides the bag with normal opening and closing functions and ensures sealing performance when closed. The one-way vent valve is a silicone umbrella valve or duckbill valve with an opening pressure of 0.5-2 kPa. The one-way vent valve allows gas inside the bag to escape under pressure difference, but prevents external gas from entering. When compressing and storing items, users can use the vent valve to release excess air, reduce storage volume, and maintain a relatively sealed environment inside the bag.

[0027] The detachable and replaceable functional inserts are located in the corner areas of the bag and are detachably connected to the bag via Velcro or slip pockets. Corner areas, due to relatively poor air circulation, are vulnerable to mold growth. The functional inserts are filled with PP cotton loaded with functional agents, providing reinforced protection for these areas. When the moisture-absorbing and mold-resistant capabilities of the functional inserts decrease, users can remove and replace them without replacing the entire storage bag, extending the product's lifespan and reducing usage costs.

[0028] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention integrates moisture absorbent, mildew inhibitor and antibacterial agent into porous fiber filling material and forms a composite structure with hydrophobic outer layer and breathable bottom layer, realizing the integration of moisture-proof, mildew-proof and antibacterial functions. The fabric itself has microclimate regulation ability and does not need to rely on external desiccant, thus improving the ease of use.

[0029] (2) The layered composite structure of the present invention achieves the directional transmission and gradient distribution regulation of moisture through the synergistic mechanism of "hydrophobic outer layer guides moisture into the layer - functional middle layer absorbs and locks in moisture - breathable bottom layer evenly disperses moisture". The moisture-proof efficiency and durability are superior to traditional passive moisture-proof solutions.

[0030] (3) The porous fiber filling material loading technology used in this invention utilizes the characteristics of large fiber gaps and high specific surface area of ​​porous fiber filling material to achieve efficient loading and slow release of functional agents, resulting in long-lasting effect of functional agents and significantly extended anti-mildew and antibacterial efficacy of the fabric.

[0031] (4) The storage bag product provided by the present invention integrates a humidity indicator, a dual-channel sealing system and a replaceable functional insert, etc. Users can intuitively perceive the state inside the bag, take the initiative to intervene, and replace worn parts in a modular way. The reliability, user experience and sustainable use performance of the product are significantly improved.

[0032] (5) The preparation method of the present invention adopts environmentally friendly hot melt adhesive web bonding or ultrasonic seamless pressing process, avoiding the use of organic solvent adhesives. The production process is environmentally friendly, the product is highly safe, and meets the health and environmental protection requirements of household products. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents included within the scope of the claims.

[0034] The main raw materials used in the embodiments of the present invention are all commercially available products: the woven fabric is selected from Oxford cloth, specifically commercially available 210D or 420D Oxford cloth; the porous fiber filling material is selected from PP cotton, specifically commercially available polypropylene fiber cotton; the breathable nonwoven fabric is selected from commercially available polyester fiber needle-punched cotton or polypropylene spunbond nonwoven fabric.

[0035] The hygroscopic agents (calcium chloride, silica gel, modified montmorillonite, molecular sieve), mildew inhibitors (nano zinc oxide, calcium propionate, potassium sorbate, isothiazolinone compounds), and antibacterial agents (nano silver, chitosan, quaternary ammonium compounds, organic guanidine compounds) are all commercially available industrial-grade products. The dispersants (polyvinyl alcohol, sodium carboxymethyl cellulose, polyethylene glycol) are commercially available analytical grade products. The hot melt adhesive web is a commercially available environmentally friendly polyamide hot melt adhesive web.

[0036] All of the above raw materials can be purchased from chemical raw material markets or professional suppliers, and those skilled in the art can select them according to actual needs. Example 1

[0037] This embodiment provides a method for preparing a moisture-wicking and mildew-resistant composite fabric, including the following steps: S1. Functional Agent Compounding: Weigh out 25 parts by weight of desiccant, 10 parts by weight of mildew inhibitor, and 8 parts by weight of antibacterial agent. The desiccant is a mixture of silica gel and modified montmorillonite in a 1:1 mass ratio; the mildew inhibitor is a mixture of nano-zinc oxide and potassium sorbate in a 2:1 mass ratio; and the antibacterial agent is a mixture of nano-silver and chitosan in a 1:2 mass ratio. Add the above functional agents to deionized water, and add polyvinyl alcohol as a dispersant at 3% of the total mass of the functional agents. Stir at 500 rpm for 20 minutes to obtain a 15 wt% compound functional agent solution.

[0038] S2. Pretreatment of porous fiber filling material: PP cotton with a thickness of 9mm is selected and impregnated in a compound functional agent solution at a temperature of 60℃ for 35 minutes, and the impregnation is repeated twice. After removal, it is dried at 100℃ for 3 hours to obtain functional PP cotton.

[0039] S3, Interlayer Composite: Selected materials treated with an organosilicon hydrophobic agent (polydimethylsiloxane emulsion) with a basis weight of 220 g / m³. 2 Oxford cloth is used as the hydrophobic outer layer, with the hydrophobic agent accounting for 3% of the Oxford cloth's mass; the selected fibers have a diameter of 20μm and have undergone antibacterial and antifungal treatment with a basis weight of 100g / m². 2 Needle-punched cotton is used as the breathable support bottom layer. A hydrophobic outer layer, functional PP cotton, and the breathable support bottom layer are layered sequentially, and interlayer lamination is performed using an environmentally friendly hot melt adhesive web film. The hot melt adhesive web film has a thickness of 40μm and a pore density of 300 pores / cm². 2 The bonding temperature was 125℃, the bonding pressure was 0.3MPa, and the bonding time was 15s, resulting in a moisture-wicking and mildew-resistant composite fabric.

[0040] The storage bag body is made of the aforementioned moisture-wicking and mildew-resistant composite fabric, and a dual-channel sealing system consisting of a sealing zipper and a one-way exhaust valve is installed on the bag body, along with a humidity indicator integrated into the bag body, to obtain the finished storage bag. Example 2

[0041] This embodiment provides a method for preparing a moisture-wicking and mildew-resistant composite fabric, which differs from Embodiment 1 in that: S1. Functional Agent Compounding: Weigh out 15 parts by weight of hygroscopic agent, 5 parts by weight of mildew inhibitor, and 3 parts by weight of antibacterial agent. The hygroscopic agent is calcium chloride, the mildew inhibitor is calcium propionate, and the antibacterial agent is a quaternary ammonium salt compound. Sodium carboxymethyl cellulose is used as the dispersant, at a dosage of 0.5% of the total mass of the functional agents. Stir at 400 rpm for 15 minutes to obtain a compound functional agent solution concentration of 5 wt%.

[0042] S2. Pretreatment of porous fiber filling material: Select PP cotton with a thickness of 3mm, impregnate at a temperature of 40℃ for 10 minutes, impregnate once, dry at a temperature of 80℃ for 1 hour.

[0043] S3, Interlayer Composite: 150g / m² basis weight selected. 2 The Oxford cloth is treated with an organosilicon hydrophobic agent (methyl silicone oil), with the amount of hydrophobic agent being 1% of the weight of the Oxford cloth; a weight of 60 g / m² is selected. 2 The needle-punched cotton is breathable, and the supporting bottom layer is made of non-woven fabric with a fiber diameter of 10μm. The hot melt adhesive web is 20μm thick with a pore density of 100 pores / cm². 2 The bonding temperature is 100℃, the bonding pressure is 0.1MPa, and the bonding time is 5s.

[0044] The remaining steps are the same as in Example 1. Example 3

[0045] This embodiment provides a method for preparing a moisture-wicking and mildew-resistant composite fabric, which differs from Embodiment 1 in that: S1. Functional Agent Compound: Weigh out 35 parts by weight of desiccant, 15 parts by weight of mildew inhibitor, and 12 parts by weight of antibacterial agent. The desiccant is a mixture of molecular sieve and silica gel at a mass ratio of 1:1. The mildew inhibitor is a mixture of isothiazolinone compound and nano zinc oxide at a mass ratio of 1:2. The antibacterial agent is a mixture of organic guanidine compound and nano silver at a mass ratio of 2:1. Polyethylene glycol is used as the dispersant, at 5% of the total mass of the functional agents. Stir at 700 rpm for 25 minutes to obtain a functional agent solution concentration of 25 wt%.

[0046] S2. Pretreatment of porous fiber filling material: Select PP cotton with a thickness of 15mm, impregnate at a temperature of 80℃ for 60min, impregnate 3 times, dry at a temperature of 120℃ for 4h.

[0047] S3, Interlayer Composite: 300g / m² is selected. 2 The Oxford cloth has a hydrophobic outer layer treated with a fluorocarbon hydrophobic agent (short-chain C6 fluorocarbon waterproofing agent), with the amount of hydrophobic agent being 5% of the weight of the Oxford cloth; a weight of 150 g / m² is selected. 2The needle-punched cotton is used, and the breathable support layer is made of needle-punched cotton with a fiber diameter of 30μm. The hot melt adhesive web is 60μm thick and has a pore density of 500 pores / cm². 2 The bonding temperature is 150℃, the bonding pressure is 0.5MPa, and the bonding time is 30s.

[0048] The remaining steps are the same as in Example 1. Example 4

[0049] This embodiment provides a method for preparing a moisture-wicking and mildew-resistant composite fabric, which differs from Embodiment 1 in that: S3. Interlayer lamination: Ultrasonic pressing technology is used to replace hot melt adhesive web bonding. The ultrasonic frequency is 25kHz, and the power density is 3W / cm². 2 The pressing speed is 8m / min and the pressing width is 3mm.

[0050] The remaining steps are the same as in Example 1. Example 5

[0051] This embodiment provides a storage bag, which differs from Embodiment 1 in that: Removable and replaceable functional inserts are provided in the corner areas of the bag body. The functional inserts are connected to the bag body by Velcro. The functional inserts are filled with functional PP cotton with the same formula as in Example 1.

[0052] The rest is the same as in Example 1.

[0053] This comparative example provides a method for preparing a composite fabric, which differs from Example 1 in that: The functional intermediate layer uses ordinary PP cotton that has not been treated with functional agents, that is, steps S1 and S2 are omitted, and ordinary PP cotton is directly used for interlayer lamination in S3.

[0054] The remaining steps are the same as in Example 1.

[0055] This comparative example provides a method for preparing a composite fabric, which differs from Example 1 in that: The functional agent contains only hygroscopic agents and does not contain mildew inhibitors or antibacterial agents. In step S1, 25 parts of hygroscopic agent are weighed out according to the mass ratio, and the amount of dispersant and the solution concentration are the same as in Example 1.

[0056] The remaining steps are the same as in Example 1.

[0057] This comparative example provides a method for preparing a composite fabric, which differs from Example 1 in that: The hydrophobic treatment of the outer hydrophobic layer is omitted, that is, ordinary Oxford cloth without hydrophobic agent treatment is used as the outer layer.

[0058] The remaining steps are the same as in Example 1. Comparative Example 4

[0059] This comparative example provides a method for preparing a composite fabric, which differs from Example 1 in that: The breathable support bottom layer is omitted, and it is composed of only two layers: a hydrophobic outer layer and a functional PP cotton composite.

[0060] The remaining steps are the same as in Example 1. Comparative Example 5

[0061] This comparative example provides a storage bag made of commercially available ordinary Oxford cloth single-layer fabric, with an individual silica gel desiccant packet placed inside (one packet of a standard commercially available 5-pack desiccant). Performance testing

[0062] The composite fabrics and storage bags prepared in the above embodiments and comparative examples were subjected to performance tests, and the test methods are as follows: 1. Moisture absorption performance test: The test was conducted in accordance with GB / T 12704.1-2009 "Textiles - Test methods for moisture permeability of fabrics - Part 1: Moisture absorption method". The fabric sample was placed in an environment with a temperature of 38℃ and a relative humidity of 90% for 24 hours, and the moisture absorption per unit area was measured.

[0063] 2. Antibacterial performance test: The test was conducted in accordance with GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Shaking method", using Escherichia coli (ATCC 25922) and Staphylococcus aureus (ATCC 6538) as test species to determine the antibacterial rate.

[0064] 3. Anti-mildew performance test: The test was conducted in accordance with GB / T 24346-2009 "Evaluation of anti-mildew performance of textiles". The fabric sample was placed in a culture environment with a temperature of 28℃ and a relative humidity of 95% for 28 days. The growth of mold was observed and the anti-mildew level was evaluated. Level 0 is the best, indicating no mold growth, and level 4 is the worst, indicating that the mold coverage area exceeds 50%.

[0065] 4. Hydrophobicity test: The test shall be conducted in accordance with GB / T 4745-2012 "Test and evaluation of water-repellent properties of textiles - water-repellent method" to determine the water repellency level of the outer layer of the fabric, with level 5 being the best and level 1 being the worst.

[0066] 5. Storage effect test: Standard cotton T-shirts with a size of 30cm×40cm and a single piece weight of about 200g were selected as clothing samples. After being folded, they were placed in storage bags with an inner size of 35cm×45cm made of fabrics from each example and comparative example. Three clothing samples were placed in each bag. After being sealed with a zipper, they were placed in a constant temperature and humidity chamber with a temperature set at 30±2℃ and a relative humidity of 85±5% for 90 days.

[0067] After the test, the clothing samples were removed and equilibrated under standard atmospheric conditions for 4 hours before the following tests were conducted: Visually observe the mildew on the surface of the clothing and evaluate it according to three levels: no mildew, slight mildew (area < 5%), and obvious mildew (area ≥ 5%); determine the moisture content of the clothing according to GB / T 9995-1997 "Determination of Moisture Content and Moisture Regain of Textile Materials - Oven Drying Method" and calculate the change in moisture content before and after storage; smell the clothing to detect any odor and evaluate it according to three levels: no odor, slight odor, and obvious odor. Test Results

[0068] Table 1. Performance test results of composite fabrics: .

[0069] Note: Comparative Example 5 is a regular storage bag with an independent desiccant, and does not involve fabric performance testing.

[0070] Table 2. Test results of storage bag performance after 90 days: .

[0071] Results Analysis As can be seen from the test results in Tables 1 and 2, Example 1, using the median values ​​of each parameter, achieved a moisture absorption of 285 mg / cm³. 2 The antibacterial rates against Escherichia coli and Staphylococcus aureus were 99.2% and 98.8%, respectively, with a mildew resistance rating of 0, demonstrating optimal overall performance. Example 2 used the lower limit of parameters; due to insufficient dosage of functional agent and insufficient PP cotton thickness, the moisture absorption decreased to 168 mg / cm³. 2 The antibacterial rate decreased to around 92%, the mildew resistance level was 1, and the water repellency level was 3. Although the various indicators have decreased, they still meet basic protection requirements. Example 3 uses the upper limit of parameters, with a moisture absorption of 258 mg / cm³. 2 The antibacterial rate was approximately 98%, slightly lower than that of Example 1. The reason for this is that the excessively high concentration of functional agents led to oversaturation of the PP cotton fiber surface, causing some functional agents to easily detach during drying and use, thus reducing the actual effective dose. It is worth noting that Example 3 achieved a water repellency rating of 5, superior to the 4 rating of Example 1, because the higher amount of hydrophobic agent resulted in better hydrophobic effects. These results indicate that there is an optimal range for the functional agent ratio, and higher dosage does not necessarily lead to better results. Example 4 used ultrasonic pressing technology instead of hot melt adhesive web bonding, and its performance was comparable to that of Example 1, demonstrating that this process can be considered an effective alternative.

[0072] Comparative Example 1, without functional agent treatment, had a moisture absorption of only 42 mg / cm³. 2The antibacterial rate was less than 15%, and the antifungal grade was level 3, proving that the functional agent loading is the key to achieving the technical effect of this invention. Comparative Example 2 used only a desiccant without adding antifungal and antibacterial agents. Although the moisture absorption was similar to Example 1, the antibacterial rate decreased to about 35%, and the antifungal grade was level 2, indicating that the synergistic effect of the three functional agents is indispensable. Comparative Example 3 did not undergo hydrophobic treatment, resulting in a water repellency grade of level 1 and a moisture absorption of 188 mg / cm³. 2 This demonstrates that the hydrophobic outer layer plays a crucial role in blocking liquids and guiding the directional transfer of moisture. In Comparative Example 4, omitting the breathable support layer reduced the moisture absorption to 245 mg / cm³. 2 The antibacterial rate decreased slightly, and the anti-mildew level was 1, proving that the bottom layer has a supporting role in the uniform dispersion of moisture and the overall protective effect.

[0073] A 90-day storage test of the storage bag showed that the moisture content change of clothing in all embodiments of the present invention was controlled within 1.5%, with no mold or odor. Comparative Example 1, lacking functional agent treatment, showed obvious mold and musty odor in the clothing, with a moisture content increase of 8.2%. Comparative Example 5, using a traditional desiccant solution, still showed slight mold and odor in the clothing, with a moisture content increase of 3.5%, proving that the integrated functional fabric solution of the present invention is superior to existing technologies. Example 5, with replaceable functional inserts in the corner areas of the bag, showed a moisture content change of only 0.6%, further demonstrating the effectiveness of the corner reinforcement design.

[0074] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A moisture-wicking and mildew-resistant composite fabric, characterized in that, From the outside in, the following are included: The hydrophobic outer layer is made of a hydrophobically treated woven fabric and is configured to guide moisture to penetrate into the inner layer and block liquids. The functional intermediate layer is filled with a porous fiber material loaded with functional agents, including hygroscopic agents, mildew inhibitors and antibacterial agents, configured to absorb and lock in moisture in a directional manner. The breathable support bottom layer is made of breathable nonwoven fabric and is configured to evenly disperse moisture and support and protect the functional middle layer. The hydrophobic outer layer, the functional intermediate layer, and the breathable support bottom layer are bonded together to form a laminated composite structure.

2. The moisture-wicking and mildew-resistant composite fabric according to claim 1, characterized in that, The woven fabric is selected from Oxford cloth, polyester cloth, nylon cloth or canvas, with a weight of 150-300 g / m². 2 The hydrophobic treatment uses silicone or fluorocarbon hydrophobic agents, and the amount of hydrophobic agent used is 1-5% of the weight of the woven fabric.

3. The moisture-wicking and mildew-resistant composite fabric according to claim 1, characterized in that, The porous fiber filling material is selected from PP cotton, polyester cotton, ES composite fiber, or hollow fiber cotton, with a basis weight of 80-200 g / m². 2 The thickness is 3-15mm.

4. The moisture-wicking and mildew-resistant composite fabric according to claim 1, characterized in that, The functional agent comprises, by weight, 15-35 parts of desiccant, 5-15 parts of mildew inhibitor, and 3-12 parts of antibacterial agent; wherein the desiccant is one or more of calcium chloride, silica gel, modified montmorillonite, and molecular sieve; the mildew inhibitor is one or more of nano zinc oxide, calcium propionate, potassium sorbate, and isothiazolinone compounds; and the antibacterial agent is one or more of nano silver, chitosan, quaternary ammonium salt compounds, and organic guanidine compounds.

5. The moisture-wicking and mildew-resistant composite fabric according to claim 1, characterized in that, The breathable nonwoven fabric is selected from needle-punched nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric or hot-air nonwoven fabric, with a basis weight of 60-150 g / m². 2 The fiber diameter is 10-30μm and it has been treated with antibacterial and antifungal agents.

6. A method for preparing the moisture-wicking and mildew-resistant composite fabric according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Functional agent compounding: Mix the desiccant, mildew inhibitor and antibacterial agent in a mass ratio of (15-35):(5-15):(3-12), add the dispersant, and stir at 300-800 rpm for 15-30 minutes until uniformly dispersed to obtain the compounded functional agent. S2. Pretreatment of porous fiber filling material: The porous fiber filling material is immersed in a compound functional agent solution for 10-60 min at a temperature of 40-80℃. After removal, it is dried at 80-120℃ for 1-4 h to obtain functional porous fiber filling material. S3. Interlayer composite: The hydrophobic outer layer, functional porous fiber filling material, and breathable support bottom layer are stacked in sequence and interlayer composite is performed by hot melt adhesive mesh bonding or ultrasonic pressing to obtain a moisture-wicking and mildew-proof composite fabric.

7. The preparation method according to claim 6, characterized in that, The dispersant in S1 is one or more of polyvinyl alcohol, sodium carboxymethyl cellulose, and polyethylene glycol, and the amount of dispersant used is 0.5-5% of the total mass of the compound functional agent; the concentration of the compound functional agent solution in S2 is 5-25 wt%, and the number of impregnations is 1-3.

8. The preparation method according to claim 6, characterized in that, When hot melt adhesive film is used for bonding in S3, the hot melt adhesive film is an environmentally friendly hot melt adhesive film with a thickness of 20-60 μm and a pore density of 100-500 pores / cm. 2 The bonding temperature is 100-150℃, the bonding pressure is 0.1-0.5MPa, and the bonding time is 5-30s. When using ultrasonic pressing, the ultrasonic frequency is 15-40kHz, and the power density is 1-5W / cm³. 2 The pressing speed is 3-15m / min, and the pressing width is 1-5mm.

9. A storage bag, characterized in that, The bag body is made of the moisture-absorbing and mildew-resistant composite fabric as described in any one of claims 1-5.

10. The storage bag according to claim 9, characterized in that, The storage bag also includes at least one of the following structures: a humidity indicator integrated into the bag body; a dual-channel sealing system including a sealing zipper and a one-way exhaust valve; and removable and replaceable functional inserts located in the corner areas of the bag body.