Microporous breathable waterproof fabric and production method thereof

Abstract

The invention provides a microporous breathable waterproof fabric and a production method thereof, and relates to the technical field of textile materials.The production method comprises the steps that alkali decrement and low-temperature plasma treatment are conducted on polyester woven base cloth, reactive active sites are obtained, a fiber surface layer anchoring pre-area is formed, and the depth of the fiber surface layer anchoring pre-area is 0.30-2.00 microns. One side of the polyester woven base cloth is coated with the reaction type transition layer, the reaction type transition layer is pre-cured, a chemical anchoring network is formed, and the reaction type transition layer has an epoxy function and a hydrolyzable siloxane function. According to the microporous breathable waterproof fabric and the production method thereof, the pore stability of the microporous polyurethane film is enhanced and the binding force between the film layer and the base cloth is effectively improved through an optimized moist heat promoting process. Under the environment of frequent friction, bending and high humidity, the waterproof effect and the air permeability of the fabric can still be kept stable, and the durability of the fabric is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile materials, in particular to a microporous breathable waterproof fabric and a production method thereof. BACKGROUND

[0002] In the development process of textiles, there is often a certain contradiction between breathability and waterproofness. Traditional cotton fabrics have good breathability and skin-friendliness, but are prone to wetness when exposed to water, lack protective properties, and are difficult to meet the needs of outdoor activities. Coated fabrics can significantly block water penetration by covering the surface of the fabric with polyurethane or polyvinyl chloride materials. However, the coating reduces the breathability of the fabric, and wearing it for a long time can cause discomfort and discomfort. With the development of outdoor sports and functional clothing, the market demand for breathable and waterproof fabrics is growing rapidly. Microporous membrane technology has been gradually applied to textile production, such as using polytetrafluoroethylene or polyurethane microporous membranes to laminate with fabric layers to form composite materials with both breathability and waterproofness. This type of material blocks liquid water penetration through the microporous structure while allowing water vapor molecules to pass through, so it is widely used in products such as rain gear, outdoor clothing, and protective clothing. Existing production processes mainly include hot melt lamination, adhesive lamination, and direct coating, some of which can balance the moisture permeability and waterproofness, and further improve the comfort by adjusting the pore size and lamination method. The application of these materials has promoted the development of functional textiles and has become a key research direction in the industry.

[0003] Although existing microporous breathable waterproof fabrics have improved protection performance, there are still key deficiencies. The most critical problem is that the stability of the microporous membrane in complex environments is not ideal, and the pore structure is easily damaged under long-term friction, bending, and high humidity conditions, leading to a decrease in waterproofness. In high-intensity sports or frequent washing processes, the bonding force between the membrane layer and the fabric is insufficient, and delamination or peeling is likely to occur, resulting in a decrease in breathability and waterproofness. Therefore, how to maintain breathability while improving the durability and firmness of the membrane layer has become a core problem that needs to be solved in this field. SUMMARY

[0004] To overcome the deficiencies of the prior art, the present application provides a microporous breathable waterproof fabric and a production method thereof, which solves the technical problem of how to achieve high waterproofness, high breathability, and durability of the microporous breathable waterproof fabric through innovative multi-layer composite structure and wet-heat accelerated bonding process, and enhance the bonding force between the membrane layer and the base fabric.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a microporous breathable waterproof fabric, comprising: a polyester woven base fabric, a reactive transition layer, a microporous polyurethane membrane, and a fluorine-free durable protective layer.

[0006] The reactive transition layer comprises the following components:

[0007] epoxy side group polyurethane-acrylate prepolymer 62 wt% - 68 wt%.

[0008] 3-(triethoxysilyl)propyl butanedioic anhydride 5 wt% - 7 wt%.

[0009] silica sol 12 wt% - 15 wt%.

[0010] diureide pyrimidinone diacrylate 1.5 wt% - 2.5 wt%.

[0011] 1,6-hexanediol diacrylate 8 wt% - 12 wt%.

[0012] isophorone diamine 1.0 wt% - 2.0 wt%.

[0013] bismuth neodecanoate catalyst 0.05 wt% - 0.15 wt%.

[0014] hindered amine light stabilizer 0.3 wt% - 0.6 wt%.

[0015] methyltrimethoxysilane 0.5 wt% - 1.0 wt%.

[0016] Preferably, the density of the polyester woven base cloth is 80 g / m2- 120 g / m2.

[0017] Preferably, the microporous polyurethane membrane comprises the following components:

[0018] polyether thermoplastic polyurethane matrix 92 wt% - 95 wt%.

[0019] catechol end group polyethylene glycol diol 2 wt% - 3 wt%.

[0020] phenylboronic acid 0.8 wt% - 1.2 wt%.

[0021] low molecular weight polycaprolactone nucleating agent 0.5 wt% - 1.0 wt%.

[0022] polycarbodiimide hydrolysis resistant agent 0.3 wt% - 0.8 wt%.

[0023] Preferably, the outer surface fluorine-free durable protective layer comprises the following components:

[0024] polydimethylsiloxane-acrylate block copolymer 50 wt% - 58 wt%.

[0025] polycarbonate diacrylate oligomer 20 wt% - 26 wt%.

[0026] hydrophobic silica 12 wt% - 16 wt%.

[0027] tetraethoxysilane crosslinker 4 wt% - 7 wt%.

[0028] 2-hydroxy-2-methylpropionphenone photoinitiator 1.0 wt% - 2.0 wt%.

[0029] 3-polyether-modified polysiloxane leveling agent 0.3 wt% - 0.7 wt%.

[0030] A method for producing a microporous breathable waterproof fabric, comprising:

[0031] S1. The polyester woven base cloth is subjected to alkali reduction and low-temperature plasma treatment to obtain reactive active sites and form a fiber surface layer anchoring pre-zone, the depth of the fiber surface layer anchoring pre-zone being 0.30 μm - 2.00 μm.

[0032] S2. The reactive transition layer is coated on one side of the polyester woven base cloth and pre-cured to form a chemical anchoring network, the reactive transition layer having epoxy function and hydrolysable siloxane function.

[0033] S3. The microporous polyurethane film is bonded to the polyester woven base cloth treated in S2 under the condition that the online pressure is 0.20 MPa - 0.50 MPa, cold drawing and heat setting of 1.20 times - 2.00 times the length of the polyester woven base cloth are carried out, the reactive transition layer is infiltrated to the microporous polyurethane film side by 2.00 μm - 8.00 μm, a Z-direction modulus gradient transition zone is constructed, the microporous polyurethane film includes pores and pore walls, and the pore walls contain binary hydroxyl type sites.

[0034] S4. A fluorine-free durable protective layer is applied to the outer surface of the microporous polyurethane film and cured, so that the surface static water contact angle is ≥ 110°.

[0035] S5. Wet heat is applied to promote the connection, so that the pore walls form a dynamic stable pore substructure in the pores.

[0036] Preferably, the thickness of the microporous polyurethane film is 8 μm - 18 μm, the average pore size is 0.10 μm - 0.30 μm, and the heat setting temperature in S3 is 130 °C - 150 °C.

[0037] Preferably, the gradient ratio of the gradient transition zone in S3 is 1.50 - 3.50.

[0038] Preferably, the wet heat is carried out at 85 °C - 92 °C for 15 min - 25 min.

[0039] Preferably, the microporous breathable waterproof fabric meets the following conditions: hydrostatic pressure ≥ 20,000 mmH2O, moisture permeability ≥ 12,000 g / m2·24h, T-peel strength ≥ 3.00 N / cm, and hydrostatic pressure retention rate ≥ 80% after 30 household washes and 30,000 Martin Dale rubs.

[0040] Preferably, the moisture and heat promote bonding causes the reversible condensation / coordination between the reactive transition layer and the dihydroxy type sites on the pore wall under the condition of 60-90℃, 70%RH-95%RH, so that the interface network is directly bonded with the pore wall and formed in the pore channel.

[0041] The present application provides a microporous breathable waterproof fabric and a production method thereof. The present application has the following beneficial effects:

[0042] The microporous breathable waterproof fabric significantly improves the overall performance of the fabric through a unique multi-layer composite structure and a fine production process. The organic combination of the polyester woven base cloth, the reactive transition layer, the microporous polyurethane membrane, and the fluorine-free durable protective layer effectively blocks the penetration of liquid water and maintains the permeability of water vapor, thereby achieving excellent waterproof performance on the basis of maintaining high breathability. The application of this technology can meet the dual demands of functionality and comfort in the fields of outdoor sports wear, rain gear, protective clothing, etc., and improve the common problems of traditional waterproof fabrics such as stuffiness and moisture in high-intensity sports

[0043] The microporous breathable waterproof fabric and the production method thereof enhance the stability of the microporous polyurethane membrane and effectively improve the bonding force between the membrane layer and the base cloth through an optimized moisture and heat promote bonding process. In the case of frequent friction, bending, and high humidity, the waterproof effect and breathability of the fabric can still remain stable, significantly improving the durability of the fabric. The present application solves the problems of poor durability and easy peeling of the membrane layer in the prior art, so that the fabric can maintain a high level of protection effect during long-term use, washing, and frequent exercise, opening up a new technical direction for the application of functional textiles. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a schematic diagram of the structure of the microporous breathable waterproof fabric;

[0045] Figure 2 is a flow chart of the fabric production process;

[0046] Figure 3 is a schematic diagram of the durability of the microporous breathable waterproof fabric;

[0047] Figure 4 is a schematic diagram of the moisture and heat promote bonding process;

[0048] Figure 5 is a schematic diagram of the structure of the fluorine-free durable protective layer. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example 1

[0051] like Figures 1-5 As shown, an embodiment of the present invention provides a microporous breathable and waterproof fabric, comprising a polyester woven base fabric, a reactive transition layer, a microporous polyurethane membrane, and a fluorine-free durable protective layer.

[0052] The reactive transition layer includes the following components:

[0053] 62 wt% epoxy-side-group polyurethane-acrylate prepolymer.

[0054] 3-(triethoxysilyl)propylsuccinic anhydride 6wt%.

[0055] 14 wt% silica sol.

[0056] Diureidinone diacrylate 2.5 wt%.

[0057] 1,6-Hexanediol diacrylate 12wt%.

[0058] Isophorone diamine 2.0 wt%.

[0059] 0.1 wt% bismuth neodecanoate catalyst.

[0060] Hindered amine light stabilizer 0.6 wt%.

[0061] Methyltrimethoxysilane 0.8 wt%.

[0062] The density of the polyester woven base fabric is 80 g / m².

[0063] Microporous polyurethane membranes comprise the following components:

[0064] 94 wt% polyether-type thermoplastic polyurethane matrix.

[0065] 3 wt% of catechol-terminated polyethylene glycol diol.

[0066] 1.2 wt% phenylboronic acid.

[0067] Low molecular weight polycaprolactone nucleating agent 1.0 wt%.

[0068] Polymeric carbodiimide hydrolysis resistant agent 0.8 wt%.

[0069] The outer fluorine-free durable protective layer comprises the following components:

[0070] Polydimethylsiloxane-acrylate block copolymer 52.5 wt%.

[0071] Polycarbonate diacrylate oligomer 24 wt%.

[0072] Hydrophobic silica 14 wt%.

[0073] Tetraethoxysilane crosslinking agent 7 wt%.

[0074] 2-Hydroxy-2-methylpropionylphenone photoinitiator 2.0 wt%.

[0075] 3-Polyether-modified polysiloxane leveling agent 0.5 wt%.

[0076] A method for producing a microporous breathable waterproof fabric, comprising:

[0077] S1. Perform alkali reduction and low-temperature plasma treatment on the polyester woven base cloth to obtain reactive active sites and form a fiber surface layer anchoring pre-zone, and the depth of the fiber surface layer anchoring pre-zone is 0.30-2.00 μm.

[0078] S2. Coat a reactive transition layer on one side of the polyester woven base cloth and pre-solidify to form a chemical anchoring network, and the reactive transition layer has epoxy function and hydrolysable siloxane function.

[0079] S3. Under the condition that the microporous polyurethane film is attached to the treated polyester woven base cloth at an online pressure of 0.20 MPa, cold drawing and heat setting of 1.20 times the length of the polyester woven base cloth are performed, the reactive transition layer penetrates into the microporous polyurethane film side by 2.00 μm, a Z-direction modulus gradient transition zone is constructed, the gradient ratio of the gradient transition zone is 1.50, the microporous polyurethane film includes pores and pore walls, and the pore walls contain dihydroxy type sites. The thickness of the microporous polyurethane film is 8 μm, the average pore size is 0.10 μm, and the heat setting temperature is 130°C.

[0080] S4. Apply a fluorine-free durable protective layer to the outer surface of the microporous polyurethane film and solidify, so that the surface static water contact angle is ≥110°.

[0081] S5. Perform hydrothermal promotion to form a dynamic stable pore substructure in the pores. The hydrothermal promotion is performed at 85°C for 15 min. The hydrothermal promotion at 60°C and 70% RH promotes the reversible condensation / coordination between the reactive transition layer and the dihydroxy type sites on the pore walls, so that the interface network is directly bonded with the pore walls and forms in the pores.

[0082] The prepared microporous breathable waterproof fabric meets the following standards: hydrostatic pressure ≥ 20,000 mmH2O, moisture permeability ≥ 12,000 g / m2·24h, T-peel strength ≥ 3.00 N / cm, and hydrostatic pressure retention rate ≥ 80% after 30 household washes and 30,000 Martindale rubs. To verify the effectiveness of producing microporous breathable waterproof fabric under the lowest process conditions in the present application, a number of performance tests were conducted, and the following are the specific results of the experimental data:

[0083] 1. Waterproof performance

[0084] The standard hydrostatic pressure test method was used to test the waterproofness of the fabric. The fabric prepared in this example showed the following results in the hydrostatic pressure test:

[0085] Hydrostatic pressure: 20,200 mmH2O.

[0086] Higher than the standard of conventional waterproof fabric, proving that using the lowest ratio of raw materials can still maintain good waterproof effect.

[0087] 2. Breathability

[0088] The moisture permeability test was used to evaluate the breathability of the fabric. The fabric with the lowest ratio showed the following performance in terms of moisture permeability:

[0089] Moisture permeability: 12,800 g / m2·24h.

[0090] The moisture permeability value meets the standard of high-performance breathable waterproof fabric, which can effectively sweat while ensuring waterproofness, maintaining the comfort of wearing.

[0091] 3. Durability

[0092] The durability of the fabric was verified by household washing test and rubbing test. The test results are as follows:

[0093] Hydrostatic pressure retention rate after household washing: 82%.

[0094] After 30 household washes, the hydrostatic pressure retention rate of the fabric is 82%, and after multiple washes, the waterproof performance of the fabric can still maintain a high level, showing good durability.

[0095] Rubbing test: 30,000 times.

[0096] After 30,000 Martindale rub tests, the fabric still maintains good waterproofness and breathability, without film layer peeling or structural damage, and the fabric shows good wear resistance during long-term use.

[0097] 4. Stability of film layer structure

[0098] The microstructure of the film layer was observed by scanning electron microscopy, and the pore size stability of the film layer under the lowest process condition was tested. The results showed that:

[0099] Pore size stability: uniform pore size, 0.20 μm.

[0100] The microporous membrane can still maintain pore stability under the lowest process condition, and the pore size distribution is uniform, which helps to ensure the air permeability and waterproofness of the fabric.

[0101] 5. Overall performance evaluation

[0102] Waterproofness: The hydrostatic pressure reached 20,200 mmH2O, higher than the industry standard.

[0103] Air permeability: The moisture permeability is 12,800 g / m2·24h, meeting the comfort requirements.

[0104] Durability: The waterproof effect retention rate after washing and rubbing is high, the film layer is stable, and the performance is maintained during long-term use.

[0105] Example Two

[0106] Based on Example One, this example explains that the microporous breathable waterproof fabric prepared under high ratio and high process conditions has superior waterproofness and air permeability.

[0107] Polyester woven base cloth, reactive transition layer, microporous polyurethane film, and fluorine-free durable protective layer.

[0108] The reactive transition layer includes the following components:

[0109] Epoxy side group polyurethane-acrylate prepolymer 66 wt%.

[0110] 3-(triethoxysilyl) propyl succinic anhydride 7 wt%.

[0111] Silica sol 15 wt%.

[0112] Diureide pyrimidone diacrylate 1.5 wt%

[0113] 1,6-hexanediol diacrylate 8 wt%

[0114] Isophorone diamine 1.0 wt%.

[0115] Bismuth neodecanoate catalyst 0.1 wt%.

[0116] Hindered amine light stabilizer 0.4 wt%.

[0117] Methyl trimethoxysilane 1.0 wt%.

[0118] The density of the polyester woven base cloth is 120 g / m2.

[0119] The microporous polyurethane film comprises the following components:

[0120] Polyether thermoplastic polyurethane matrix 94 wt%.

[0121] Catechol end group polyethylene glycol diol 3 wt%.

[0122] Phenylboronic acid 1.2 wt%.

[0123] Low molecular weight polycaprolactone nucleating agent 1.0 wt%.

[0124] Polycarbodiimide hydrolysis resistance agent 0.8 wt%.

[0125] The outer surface fluorine-free durable protective layer comprises the following components:

[0126] Polydimethylsiloxane-acrylate block copolymer 55 wt%.

[0127] Polycarbonate diacrylate oligomer 24 wt%.

[0128] Hydrophobic silica 14 wt%.

[0129] Tetraethoxysilane crosslinking agent 5 wt%.

[0130] 2-Hydroxy-2-methylpropionyl phenyl photoinitiator 1.5 wt%.

[0131] 3-Polyether modified polysiloxane leveling agent 0.5 wt%.

[0132] A microporous breathable waterproof fabric production method comprises:

[0133] S1. Perform alkali reduction and low-temperature plasma treatment on the polyester woven base cloth to obtain reactive active sites and form a fiber surface layer anchoring pre-zone, and the depth of the fiber surface layer anchoring pre-zone is 2.00 μm.

[0134] S2. Coating a reactive transition layer on one side of the polyester woven base cloth and pre-solidifying to form a chemical anchoring network, and the reactive transition layer has epoxy function and hydrolyzable siloxane function.

[0135] S3. The microporous polyurethane film is attached to the polyester woven base cloth treated in S2 under the condition that the online pressure is 0.50 MPa, cold drawing and heat setting of 2.00 times the length of the polyester woven base cloth are implemented, the reactive transition layer penetrates 8.00 μm to the microporous polyurethane film side, a Z-direction modulus gradient transition zone is constructed, the gradient ratio of the gradient transition zone is 3.50, the microporous polyurethane film includes pores and pore walls, and the pore walls contain dihydroxyl type sites. The thickness of the microporous polyurethane film is 18 μm, the average pore size is 0.30 μm, and the heat setting temperature is 150°C.

[0136] S4. Apply a fluorine-free durable protective layer on the outer surface of the microporous polyurethane membrane and cure it, so that the surface static water contact angle is ≥110°.

[0137] S5. Perform hydrothermal co-promotion, so that the pore wall forms a dynamic stable pore substructure in the pore channel. The hydrothermal co-promotion is performed at 92°C for 25 minutes. The hydrothermal co-promotion at 90°C and 95% RH promotes the reversible condensation / coordination between the reactive transition layer and the dihydroxyl group sites on the pore wall, so that the interface network is directly bonded to the pore wall and forms in the pore channel.

[0138] The microporous breathable waterproof fabric meets the requirements of static water pressure ≥20,000 mmH2O, moisture permeability ≥12,000 g / m2·24h, T-peel strength ≥3.00 N / cm, and static water pressure retention rate ≥80% after 30 household washes and 30,000 Martin's rubs.

[0139] The waterproof performance is produced under high proportion and high process conditions, using more high-quality raw materials and higher processing temperature and pressure. The experimental results are as follows:

[0140] Static water pressure: 30,000 mmH2O.

[0141] The static water pressure of 30,000 mmH2O far exceeds the standard of conventional waterproof fabric, effectively blocking more water penetration.

[0142] 2. Breathability

[0143] In order to ensure the breathability of the fabric, a higher proportion of polyurethane and other components are used, and the pore size and pore channel stability of the membrane are precisely controlled. The experimental results are as follows:

[0144] Moisture permeability: 15,000 g / m2·24h.

[0145] Through the design of high proportion, the fabric shows excellent breathability in the moisture permeability test, exceeding the industry standard, not only having good waterproofness, but also ensuring the comfort of the wearer in terms of breathability.

[0146] 3. Durability

[0147] The durability of the fabric is verified by household washing test and rubbing test, and the specific results are as follows:

[0148] Static water pressure retention rate after household washing: 95%.

[0149] After 50 household washes, the static water pressure retention rate of the fabric is 95%, showing extremely high durability. The fabric under high proportion conditions can maintain its waterproof performance during long-term use and cleaning, greatly improving the service life of the fabric.

[0150] Friction test: 50,000 times.

[0151] After 50,000 Martin Dale friction tests, the fabric still maintains high levels of waterproofness and breathability. This fabric demonstrates stronger abrasion resistance and durability under extreme use conditions, ensuring it does not easily damage in high-strength friction environments.

[0152] 4. Membrane layer structure stability

[0153] By observing the microstructure of the membrane layer with a scanning electron microscope, the pore size stability of the membrane layer under high proportion is tested. The experimental results show that:

[0154] Pore size stability: more uniform pore size distribution, 0.10 μm.

[0155] The design of high process conditions ensures the uniformity and stability of the membrane layer pore size, which helps to improve the waterproofness and breathability of the fabric. Fine control of pore size ensures the dynamic breathability of the fabric in high humidity environments, while effectively blocking water penetration.

[0156] 5. Overall performance evaluation

[0157] Based on the above test data, the microporous breathable waterproof fabric under high proportion and high process conditions exhibits excellent performance:

[0158] Waterproofness: static water pressure reaches 30,000 mmH2O, far exceeding industry requirements.

[0159] Breathability: moisture permeability is 15,000 g / ㎡·24h, providing excellent wearing comfort.

[0160] Durability: static water pressure retention rate after domestic washing is as high as 95%, wear resistance and damage resistance are significantly improved.

[0161] Example Three

[0162] Based on the above examples, this example uses balanced proportion and process conditions to prepare microporous breathable waterproof fabric to balance performance and cost.

[0163] Polyester woven base cloth, reactive transition layer, microporous polyurethane membrane, and fluorine-free durable protective layer.

[0164] The reactive transition layer includes the following components:

[0165] Epoxy side group polyurethane-acrylate prepolymer 63wt%.

[0166] 3-(triethoxysilyl) propyl succinic anhydride 6wt%.

[0167] Silica sol 13wt%.

[0168] Diureide ketone dipropenoate 2.5 wt%.

[0169] 1,6-hexanediol diacrylate 12 wt%.

[0170] Isophorone diamine 2.0 wt%.

[0171] Bismuth neodecanoate catalyst 0.1 wt%.

[0172] Hindered amine light stabilizer 0.6 wt%.

[0173] Methyltrimethoxysilane 0.8 wt%.

[0174] The density of the polyester woven base cloth is 80 g / m2-120 g / m2.

[0175] The microporous polyurethane film comprises the following components:

[0176] Polyether thermoplastic polyurethane matrix 94 wt%

[0177] Catechol end group polyethylene glycol diol 3 wt%.

[0178] Phenylboronic acid 1.2 wt%.

[0179] Low molecular weight polycaprolactone nucleating agent 1.0 wt%.

[0180] Polycarbodiimide hydrolysis-resistant agent 0.8 wt%.

[0181] The outer surface fluorine-free durable protective layer comprises the following components:

[0182] Polydimethylsiloxane-acrylate block copolymer 52.5 wt%.

[0183] Polycarbonate diacrylate oligomer 24 wt%.

[0184] Hydrophobic silica 14 wt%.

[0185] Tetraethoxysilane crosslinking agent 7 wt%.

[0186] 2-Hydroxy-2-methylpropionylphenyl photoinitiator 2.0 wt%.

[0187] 3-Polyether-modified polysiloxane leveling agent 0.5 wt%.

[0188] A microporous breathable waterproof fabric production method comprises:

[0189] S1. The polyester woven base cloth is subjected to alkali weight reduction and low-temperature plasma treatment to obtain reactive active sites and form fiber surface layer anchoring pre-zones, and the depth of the fiber surface layer anchoring pre-zones is 1.15 μm.

[0190] S2. Apply a reactive transition layer on one side of the polyester woven base fabric and pre-cure it to form a chemical anchoring network. The reactive transition layer has epoxy functionality and hydrolysable siloxane functionality.

[0191] S3. Bond the microporous polyurethane film to the treated polyester woven base fabric under a line pressure of 0.35 MPa. Perform cold drawing and heat setting on the polyester woven base fabric for 1.60 times the length, allowing the reactive transition layer to penetrate 5.00 μm towards the microporous polyurethane film side, creating a Z-direction modulus gradient transition zone with a gradient ratio of 2.50. The microporous polyurethane film includes pores and pore walls, and the pore walls contain dihydroxy-based sites. The microporous polyurethane film has a thickness of 13 μm and an average pore size of 0.20 μm. The heat setting temperature is 140°C.

[0192] S4. Apply a fluorine-free durable protective layer to the outer surface of the microporous polyurethane film and cure it to achieve a surface static water contact angle of ≥110°.

[0193] S5. Perform hydrothermal promotion to form a dynamic stable pore substructure within the pores. The hydrothermal promotion is performed at 88.5°C for 20 minutes. The hydrothermal promotion at 75°C and 82.5% RH promotes reversible condensation / coordination between the reactive transition layer and the dihydroxy-based sites on the pore walls, allowing the interface network to directly bond with the pore walls and form within the pores.

[0194] The microporous breathable waterproof fabric meets the following specifications: static water pressure ≥20,000 mmH2O, moisture permeability ≥12,000 g / m2·24h, T-peel strength ≥3.00 N / cm, and static water pressure retention rate ≥80% after 30 household washes and 30,000 Martindale rubs. By balancing the proportions and applying reasonable process conditions, a fabric with excellent waterproofness, breathability, and durability is prepared, meeting the high standards of functional textiles.

[0195] 1. Waterproof performance

[0196] Under balanced proportions and reasonable process conditions, the waterproofness of the fabric is verified by static water pressure testing. The experimental data are as follows:

[0197] Static water pressure: 25,500 mmH2O.

[0198] The static water pressure of this fabric is higher than the industry standard, indicating that it has strong protective effect in terms of waterproofness and can effectively prevent water penetration.

[0199] 2. Breathability

[0200] To ensure the comfort of the fabric, a reasonable proportion is adopted to balance the waterproofness and breathability, and the results are as follows:

[0201] Moisture permeability: 13,800 g / m2·24h.

[0202] By optimizing the ratio, the fabric performs outstandingly in terms of moisture permeability, far exceeding industry standards. The fabric not only has good waterproofness, but also maintains good air permeability, suitable for long-term wear and high-intensity exercise.

[0203] 3. Durability

[0204] The durability of the fabric is fully verified in home washing and rubbing tests, with the following experimental data:

[0205] Hydrostatic pressure retention rate after home washing: 88%.

[0206] After 30 times of home washing, the fabric's hydrostatic pressure retention rate is 88%, and the waterproofness of the fabric can still be effectively maintained after multiple washes, with high durability.

[0207] Rubbing test: 40,000 times.

[0208] After 40,000 times of Martindale rubbing test, the fabric still maintains good waterproofness and air permeability, proving that the fabric is still stable and not easily damaged in high-intensity rubbing environment.

[0209] 4. Membrane layer structure stability

[0210] By observing the microstructure of the membrane layer with a scanning electron microscope, the pore stability of the fabric under balanced ratio and process conditions is tested. The experimental data are as follows:

[0211] Pore size stability: uniform pore size distribution, 0.20 μm.

[0212] The highly uniform pore size distribution indicates that the stability of the membrane layer pore structure under balanced ratio and process conditions is effectively guaranteed. The pore size stable membrane layer can provide good air permeability while maintaining waterproofness.

[0213] 5. Overall performance evaluation

[0214] Based on the above test data, the microporous air-permeable waterproof fabric under balanced ratio and reasonable process conditions exhibits excellent overall performance:

[0215] Waterproofness: hydrostatic pressure is 25,500 mmH2O, exceeding industry standards.

[0216] Air permeability: moisture permeability is 13,800 g / ㎡·24h, ensuring comfort and functionality.

[0217] Durability: after 30 times of home washing and 40,000 times of rubbing, the waterproofness and air permeability of the fabric are effectively maintained.

[0218] Example Four

[0219] This embodiment demonstrates the significant advantages of the ratio range and process conditions used in the present application in performance by comparing the micro-porous breathable waterproof fabric prepared under the conventional process conditions with the micro-porous breathable waterproof fabric prepared under the ratio range and process conditions of the present application.

[0220] 1. Experimental design

[0221] Conventional process conditions and ratios

[0222] The conventional process and ratio conditions are selected for comparison, and the specific configurations are as follows:

[0223] Conventional process conditions:

[0224] Base cloth treatment: conventional chemical treatment, surface anchoring pre-zone depth of 0.50 μm.

[0225] Micro-porous membrane composite: composite using a pressure of 0.35 MPa.

[0226] Heat setting temperature: 150℃.

[0227] The process conditions of the present application are:

[0228] Process conditions:

[0229] Base cloth treatment: using low temperature plasma treatment, surface anchoring pre-zone depth controlled at 0.45 μm.

[0230] Micro-porous membrane composite: cold drawing and heat setting using a pressure of 0.45 MPa, membrane layer thickness of 10 μm, and pore size controlled at 0.12 μm.

[0231] Heat setting temperature: 130℃, to ensure the stability of the membrane layer and good pore structure.

[0232] 2. Experimental data and results

[0233] 2.1 Waterproof performance

[0234] Conventional process conditions:

[0235] Hydrostatic pressure: 18,500 mmH2O.

[0236] The waterproof performance of the fabric under the conventional process conditions is general, although it meets the basic requirements, but compared with the best process conditions of the present application, the waterproof effect is slightly insufficient.

[0237] Process conditions of the present application:

[0238] Hydrostatic pressure: 25,500 mmH2O.

[0239] Under the optimized ratio and process conditions of the present application, the hydrostatic pressure of the fabric is significantly improved, showing more excellent waterproof effect.

[0240] 2.2 Air permeability

[0241] Traditional process conditions:

[0242] Moisture permeability: 12,100 g / m2·24h.

[0243] Although the moisture permeability meets the basic requirements, there is a certain gap in air permeability compared with the fabric of the present application, which may cause the wearer to feel uncomfortable during high-intensity exercise.

[0244] Process conditions of the present application:

[0245] Moisture permeability: 13,800 g / m2·24h.

[0246] Through optimization of the ratio, the fabric of the present application performs well in moisture permeability, significantly improving the air permeability of the fabric, suitable for long-term wear and use during exercise.

[0247] 2.3 Durability

[0248] Traditional process conditions:

[0249] Hydrostatic pressure retention rate after domestic washing: 70%.

[0250] Friction test: 30,000 times.

[0251] After experiencing multiple domestic washes and friction tests, the waterproof performance of the fabric under traditional process conditions decreases, showing low durability.

[0252] Process conditions of the present application:

[0253] Hydrostatic pressure retention rate after domestic washing: 90%.

[0254] Friction test: 30,000 times.

[0255] After the same domestic washing and friction test, the fabric of the present application maintains excellent waterproofness and air permeability, the hydrostatic pressure retention rate increases by 20%, and the durability is greatly enhanced.

[0256] 2.4 Stability of membrane layer structure

[0257] Traditional process conditions:

[0258] The pore size is uneven, the pore size range is 0.15-0.30 μm, and the membrane layer has pore blockage and instability, which affects the air permeability and waterproofness of the fabric.

[0259] Process conditions of the present application:

[0260] The pore size distribution is uniform, the pore size is stable at 0.12-0.20 mu m, the film layer structure is stable, and the long-time use effect is superior, which helps to provide uniform air permeability and waterproofness for the fabric.

[0261] 3. Conclusion

[0262] The ratio interval and process conditions of the application are optimal, which not only meets the demand of high-performance waterproof fabric, but also effectively improves the durability and comfort. The data shows that the application has better application potential in the field of functional textiles, and can meet the comprehensive requirements of waterproofness, air permeability and durability in high-strength use environment.

[0263] Although embodiments of the application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microporous breathable and waterproof fabric, characterized in that, include: Polyester woven base fabric, reactive transition layer, microporous polyurethane membrane and fluorine-free durable protective layer; The reactive transition layer comprises the following components: Epoxy-side-group polyurethane-acrylate prepolymer 62wt%–68wt%; 3-(triethoxysilyl)propylsuccinic anhydride 5wt%–7wt%; 12wt%–15wt% silica sol; Diureidinone diacrylate 1.5wt%–2.5wt%; 1,6-Hexanediol diacrylate 8wt%–12wt%; Isophorone diamine 1.0 wt%–2.0 wt%; Bismuth neodecanoate catalyst 0.05wt%–0.15wt%; Hindered amine light stabilizer 0.3wt%–0.6wt%; Methyltrimethoxysilane 0.5wt%–1.0wt%.

2. The microporous breathable and waterproof fabric according to claim 1, characterized in that: The density of the polyester woven base fabric is 80 g / m²–120 g / m².

3. The microporous breathable and waterproof fabric according to claim 1, characterized in that: The microporous polyurethane membrane comprises the following components: Polyether-based thermoplastic polyurethane matrix 92wt%–95wt%; Catechol-terminated polyethylene glycol diol 2wt%–3wt%; Benzylboronic acid 0.8wt%–1.2wt%; Low molecular weight polycaprolactone nucleating agent 0.5wt%–1.0wt%; Polycarbodiimide anti-hydrolysis agent 0.3wt%–0.8wt%.

4. The microporous breathable and waterproof fabric according to claim 1, characterized in that: The fluorine-free durable protective layer on the outer surface comprises the following components: 50wt%–58wt% of polydimethylsiloxane-acrylate block copolymer; Polycarbonate diacrylate oligomer 20wt%–26wt%; 12wt%–16wt% hydrophobic silica; Tetraethoxysilane crosslinking agent 4wt%–7wt%; 2-Hydroxy-2-methylpropionylbenzene photoinitiator 1.0 wt%–2.0 wt%; 3-Polyether modified polysiloxane leveling agent 0.3wt%–0.7wt%.

5. A method for producing a microporous breathable and waterproof fabric, characterized in that: S1. The polyester woven base fabric is subjected to alkali reduction and low-temperature plasma treatment to obtain reactive active sites and form a fiber surface anchoring pre-zone, the depth of which is 0.30μm–2.00μm; S2. The reactive transition layer is coated on one side of the polyester woven base fabric and pre-cured to form a chemical anchoring network. The reactive transition layer has epoxy functionality and hydrolyzable siloxane functionality. S3. The microporous polyurethane membrane is bonded to the polyester woven base fabric treated in S2 under online pressure of 0.20MPa–0.50MPa. The polyester woven base fabric is subjected to cold stretching and heat setting of 1.20 to 2.00 times its length, so that the reactive transition layer penetrates into the microporous polyurethane membrane side by 2.00μm–8.00μm to construct a Z-direction modulus gradient transition region. The microporous polyurethane membrane includes channels and pore walls, and the pore walls contain binary hydroxyl sites. S4. Apply a fluorine-free durable protective layer to the outer surface of the microporous polyurethane membrane and cure it so that the surface static water contact angle is ≥110°; S5. Perform humid heat to promote bonding, so that the pore wall forms a dynamic stable pore substructure within the pore channel.

6. The method for producing a microporous breathable and waterproof fabric according to claim 5, characterized in that: The microporous polyurethane membrane has a thickness of 8μm–18μm and an average pore size of 0.10μm–0.30μm. The heat setting temperature in S3 is 130℃–150℃.

7. The method for producing a microporous breathable and waterproof fabric according to claim 5, characterized in that: The gradient ratio of the gradient transition region described in S3 is 1.50–3.

50.

8. The method for producing a microporous breathable and waterproof fabric according to claim 5, characterized in that: The moist-heat promotion was carried out at 85℃–92℃ for 15 min–25 min.

9. The method for producing a microporous breathable and waterproof fabric according to claim 5, characterized in that: The microporous breathable and waterproof fabric meets the following requirements: hydrostatic pressure ≥20,000 mmH2O, moisture permeability ≥12,000 g / m²·24h, T-peel strength ≥3.00 N / cm, and hydrostatic pressure retention rate ≥80% after 30 household washes and 30,000 Martindale rubs.

10. The method for producing a microporous breathable and waterproof fabric according to claim 5, characterized in that: The hydrothermal catalysis induces reversible condensation / coordination between the reactive transition layer and the binary hydroxyl sites on the pore wall under conditions of 60℃–90℃ and 70%RH–95%RH.

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