Light waterproof jacket fabric and preparation method thereof

Abstract

The invention discloses a light waterproof jacket fabric and a preparation method thereof, and relates to the technical field of woven fabrics. Comprising the following steps that 1, grey yarn is sequentially subjected to warping, slashing, re-beaming and weaving, and woven fabric is obtained; 2, the woven fabric, a waterproof film and an inner layer are stacked in sequence, the contact faces are bonded through glue points, and the light waterproof outdoor jacket fabric is obtained; through the specific fabric structure design and the low-tension precision weaving process, the product with good waterproofness, moisture and air permeability and high tearing strength is prepared, the gram weight of the woven fabric is only 17 g / m < 2 >, and the fabric is suitable for manufacturing light waterproof outdoor jackets.

Description

Technical Field

[0001] This invention relates to the field of woven fabric technology, specifically to a lightweight waterproof jacket fabric and its preparation method. Background Technology

[0002] In recent years, with the continuous improvement of people's living standards, the market has placed higher demands on the comprehensive performance of textile fabrics. They not only need to meet the requirements of comfort, lightness, and softness, but also need to possess functional characteristics such as waterproofing and breathability. Lightweight and functional fabrics have become a trend in textile fabric development.

[0003] Microfiber has a soft feel, good capillary effect, and an elegant luster like silk. It also has good moisture absorption and wicking properties as well as stain resistance. At the same time, after being tightly woven, the fabric pore size is smaller than the size of a water droplet but larger than the size of a water vapor molecule. This not only ensures the fabric's lightweight nature but also provides good waterproof and breathable performance, making it widely used in outdoor jacket fabrics.

[0004] However, in practical applications, due to the softness and sensitive structure of the yarn itself, problems such as wear and breakage are prone to occur during the weaving process, significantly increasing the difficulty of weaving. Therefore, in fabric production, more reasonable fabric structure design and stricter control of weaving processes are needed to achieve the tight weaving of ultra-fine denier fibers and fully utilize their performance advantages.

[0005] Currently, the most commonly used fine denier yarns on the market are 20D and 40D. These yarns have a relatively large diameter, resulting in fabrics with larger pores after weaving, which cannot achieve good waterproof performance. Furthermore, the weight of woven fabrics made from 20D and 40D yarns is typically around 45g / m². 2 65g / m 2 The weight of the fabric is relatively high, making it difficult to achieve the ultra-lightweight requirement. The waterproof fabric prepared by CN119020903B, although it has good waterproof and abrasion resistance, also has reduced moisture permeability due to the composite MXene nanosheets adhering to the fiber surface and filling the tiny pores. This increases the weight of the woven fabric itself, making it unable to meet the requirements of moisture permeability and lightweight.

[0006] In summary, the development of a lightweight waterproof jacket fabric and its preparation method is of great significance in addressing the aforementioned issues. Summary of the Invention

[0007] The purpose of this invention is to provide a lightweight waterproof jacket fabric and its preparation method to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A method for preparing a lightweight waterproof outerwear fabric includes the following steps: Step 1: The raw yarn is sequentially processed through warping, sizing, beam bonding, and weaving to obtain the woven fabric; Step 2: Stack the woven fabric, waterproof membrane, and inner layer in sequence, and use adhesive dots to bond the contact surfaces to obtain a lightweight waterproof jacket fabric.

[0009] The raw yarn includes warp and weft yarns, and the warp and weft yarns use chemical fiber filaments, including one type of bright, semi-dull and fully dull yarns; the raw yarn includes, but is not limited to, one type of 7D fine denier nylon FDY or DTY semi-dull yarn.

[0010] The inner layer of the fabric includes, but is not limited to, nylon 5D~10D fabric.

[0011] Among them, adhesive dot bonding includes, but is not limited to, bonding with moisture-curing hot melt adhesive.

[0012] Ideally, the woven fabric is a plain weave checkered structure with a warp density to weft density ratio of (1.1~1.3):1 and a weight of 15~23 g / m². 2 The basis weight of the waterproof membrane is 8~12g / m³. 2 The weight of the inner layer of the fabric is 10~12 g / m². 2 .

[0013] Among them, designing a plain weave grid structure with a warp density to weft density ratio of 1.2:1 is a more optimized solution, which combines waterproof and breathable functions and improves tear strength.

[0014] In a more optimized manner, in step 1, during the sizing process, acrylic sizing agent is used as the sizing liquid, with a sizing rate of 11-16%, a sizing temperature of 35-45℃, a drying chamber 1 temperature of 135-145℃, a drying chamber 2 temperature of 125-135℃, a cylinder 1 temperature of 100-110℃, a cylinder 2 temperature of 100-110℃, a cylinder 3 temperature of 90-100℃, a cylinder 4 temperature of 90-100℃, a cylinder 5 temperature of 80-90℃, a sizing speed of 110-130m / min, a warp tension of 3-5kg, and a crimping tension of 3.5-5kg.

[0015] Among them, the sizing process adopts a low temperature, high pressure, high speed and heavy immersion sizing route to achieve the flattening of the hairs on the surface of the warp yarns, enhance the cohesion of the yarn bundles and improve their abrasion resistance.

[0016] In a more optimized manner, during the weaving process in step 1, the machine speed is 400~500 r / min, the machine tension is 850~1050 N, the water outlet angle is 90~100°, the back beam height is -15~-25 mm, the angle is 10~25°, the heald frame height is 160~190 mm, the first heald frame opening is 55~65 mm, the heald leveling time is 340~350°, the water flow is 20~35 mm, and the water cutting angle is... The angle between the waterline and the reed is 160-180°, the contact angle between the waterline and the reed is 275-290°, the shearing time on the left is 5-15°, the shearing time on the right is 0°, the length of the edge is 2-4mm on both sides, the length measuring wheels 1 and 2 are set to 188-192mm and 186-190mm respectively, the weft storage tension 1 and 2 are 70-85N and 70-85N respectively; the temperature and humidity of weaving are controlled at 25-30℃ and 60-70%.

[0017] In the weaving process, the following measures were taken: reducing the abrasion of the warp yarns by the heald frames and the generation of static electricity; appropriately reducing the loom speed to mitigate the frictional impact on the warp yarns due to the shedding and beating movements; rationally adjusting the position of the back beam, the working length of the spring, and the weight of the tension weight to reduce the tension of the warp yarns on the loom; appropriately reducing the shedding stroke to minimize the change in warp yarn tension during the shedding process; and rationally adjusting the parameters of the water jet weft insertion process, such as water line, water volume, water pressure, and jetting time, to effectively ensure weavability and maintain low tension in the fabric.

[0018] In a more optimized manner, during the process of plying the shafts in step 1, the number of shafts is 12 to 16, the tension of the shaft frame is 5 to 9 kg, and the winding tension is 60 to 70 kg. The number of shafts and the feed tension and winding tension of each shaft are uniform and consistent to ensure the weaveability of the fabric.

[0019] During the warping process, the warping speed is 150~250m / min, the bobbin tension is 0.5~2kg, the crimping tension is 3~5kg, and the pressure roller pressure is 0.2±0.03kg. These warping parameters ensure that the tension of each warp yarn is uniform and consistent, minimizing friction and stretching during warp winding to prevent damage to its strength and elasticity.

[0020] In a more optimized manner, the method for preparing the waterproof membrane is as follows: Step 1: Mix hydrophobic double bond-terminated polyurethane emulsion, vinyl flake montmorillonite, modified spherical silica, lauryl methacrylate, butyl acrylate, and emulsifier at 75~80℃ for 2~3h, cool to room temperature, add adhesive and stir for 30~60min, defoam, and obtain film-forming solution. Step 2: Apply the film-forming solution evenly to the base film, dry it, and roll it up to obtain a waterproof and breathable film.

[0021] In a more optimized manner, the raw materials of the film-forming solution include the following components: by weight, 40-45 parts of hydrophobic double-bond-terminated polyurethane emulsion, 3-5 parts of vinyl flake montmorillonite, 4-6 parts of modified spherical silica, 2.5-3.5 parts of lauryl methacrylate, 1.5-2.5 parts of butyl acrylate, 0.3-0.6 parts of emulsifier, and 0.7-1.5 parts of adhesive.

[0022] In a more optimized manner, the preparation method of the vinyl flake montmorillonite is as follows: flake montmorillonite and vinyl silane coupling agent are added to an ethanol aqueous solution, reacted at 50~60℃ for 5~6h, cooled and dried to obtain vinyl flake montmorillonite; In the raw materials of the vinyl flake montmorillonite, the mass ratio of flake montmorillonite to vinyl silane coupling agent is 5:(0.8~1.4).

[0023] The modified spherical silica is prepared by adding spherical silica and vinyl silane coupling agent to an aqueous ethanol solution, reacting at 50-60°C for 5-6 hours, cooling and drying to obtain vinyl spherical silica; adding vinyl spherical silica, 1H,1H,2H,2H-perfluorodecylthiol and azobisisobutyronitrile to tetrahydrofuran, reacting at 55-65°C for 3-5 hours, and drying to obtain modified spherical silica.

[0024] In the raw material of vinyl spherical silica, the mass ratio of spherical silica to vinyl silane coupling agent is 5:(1~2); the raw material of modified spherical silica includes the following components: by weight, 6~8 parts vinyl spherical silica, 1~2 parts 1H,1H,2H,2H-perfluorodecyl mercaptan, and 0.02~0.05 parts azobisisobutyronitrile.

[0025] In a more optimized manner, the preparation method of the hydrophobic double-bond-terminated polyurethane emulsion is as follows: polytrimethylene ether glycol, isophorone diisocyanate, and dibutyltin dilaurate are added to NMP and reacted at 45-55°C for 1-2 hours. Then, 2,2-dimethylolpropionic acid and 7-hydroxyoctanoic acid are added and reacted for 1-2 hours. Hydroxyethyl acrylate is added and stirred for 2-3 hours. After cooling, triethylamine and deionized water are added, and the mixture is emulsified for 1-3 hours. After defoaming, the hydrophobic double-bond-terminated polyurethane emulsion is obtained. The raw materials of the hydrophobic double-bond-terminated polyurethane emulsion include the following components by weight: 6-6.5 parts polytrimethylene ether glycol, 4-5 parts isophorone diisocyanate, 0.03-0.06 parts dibutyltin dilaurate, 0.6-1 part 2,2-dimethylolpropionic acid, 0.3-0.5 parts 7-hydroxyoctanoic acid, 0.5-1 part hydroxyethyl acrylate, 0.1-0.3 parts triethylamine, and 100-150 parts deionized water.

[0026] A method for preparing a lightweight waterproof jacket fabric.

[0027] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) This application achieves a balance between waterproofness, breathability, and high tear strength while ensuring low fabric tension through specific fabric structure design and low-tension precision weaving technology. More optimally, 7D fine denier nylon FDY is used as both warp and weft yarns. Combined with specific weave design, warp and weft arrangement, and machine processing conditions, a final product with a weight of 17 g / m² is produced. 2 Woven fabric.

[0028] (2) This application uses modified spherical silica and vinyl flake montmorillonite as fillers to prepare the fabric surface layer with other components, which further improves the waterproofness and breathability of the product while ensuring lightweight. Spherical silica is added randomly between the flake montmorillonite to form a more complex maze effect, preventing the excessively dense stacking of montmorillonite flakes, thereby maintaining and widening the water vapor channel, allowing water vapor molecules to pass through while blocking liquid water, thus improving waterproofness while taking into account breathability; hydrophobic segments are introduced into the filler (modified spherical silica) and the matrix (hydrophobic double bond-terminated polyurethane emulsion, lauryl methacrylate) in the fabric surface layer, which improves compatibility and further enhances the waterproof function.

[0029] It is important to note that the ratio of modified spherical silica to vinyl montmorillonite flakes and the amount of overall filler introduced need to be controlled. This is because if the proportion of modified spherical silica is too low, the lack of spacers can easily lead to the formation of localized dense areas, resulting in stress concentration and performance degradation. If the proportion of modified spherical silica is too high or the amount of filler introduced is too large, both will cause agglomeration, significantly reduce uniformity, and decrease overall performance. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0031] It should be noted that the following quantities are by weight. There are no special restrictions on the manufacturers of the raw materials involved in this invention. Exemplary examples include: spherical silica (product number YT-Oy-01-3) purchased from Shanghai Yaotian New Material Technology Co., Ltd.; flake montmorillonite (product number 103635) from Nanocor inorganic montmorillonite; vinyl coupling agent (vinyltrimethoxysilane); polytrimethylene ether glycol (relative molecular mass 1000); emulsifier (EMULGEN 1150S-60); adhesive (adhesive 1173); sizing agent (textile sizing agent RG-SB) purchased from Weifang Jintai Material Factory; moisture-curing hot melt adhesive (moisture-curing PUR hot melt adhesive); 1H,1H,2H,2H-perfluorodecyl mercaptan (CAS number 34143-74-3); and other raw materials are commercially available.

[0032] Example 1: A method for preparing a lightweight waterproof jacket fabric, comprising the following steps: Step 1: The raw yarn (including warp and weft yarns, both 7D ultra-fine denier nylon FDY) is sequentially processed through warping (warping speed 200m / min, creel tension 1kg, crimp tension 4kg, pressure roller pressure 0.2kg), sizing (using acrylic sizing agent as the sizing liquid, sizing rate 15%, sizing temperature 40℃, drying room 1 temperature 140℃, drying room 2 temperature 130℃, cylinder 1 temperature 105℃, cylinder 2 temperature 105℃, cylinder 3 temperature 100℃, cylinder 4 temperature 100℃, cylinder 5 temperature 85℃, sizing speed 120m / min, warp feed tension 4.5kg, crimp tension 4.8kg), beam bending (14 beams, warp creel tension 7kg, crimp tension 65kg), and weaving. (The machine speed is 450 r / min, the machine tension is 1000 N, the water outlet angle is 98°, the rear beam height is -20 mm, the angle is 20°, the heald frame height is 184 mm, the first heald frame opening is 60 mm, the heald leveling time is 344°, the water volume is 30 mm, the water cutting angle is 173°, the water line contact angle with the reed is 285°, the shearing time on the left is 7°, the shearing time on the right is 0°, the edge length is 3 mm on both sides, the length measuring wheels 1 and 2 are set to 190 mm and 188 mm respectively, the weft storage tensions 1 and 2 are 78 N and 78 N respectively; the weaving temperature and humidity are controlled at 27℃ and 65%), resulting in a woven fabric (the woven fabric is a plain weave checkered structure, with a warp density to weft density ratio of 1.2:1). Step 2: Apply the waterproof membrane (8~12g / m²) 2 ), woven fabric (weight 17g / m²) 2 ), inner layer of fabric (nylon 7D fabric, weight 10~12g / m²) 2Stack the layers in sequence and use adhesive dots (moisture-curing hot melt adhesive) to bond the contact surfaces to obtain a lightweight waterproof jacket fabric; The method for preparing the waterproof membrane is as follows: S1-1: Add 5 parts of flake montmorillonite and 1.1 parts of vinyl silane coupling agent to an 80% ethanol aqueous solution, react at 55°C for 5.5 h, cool and dry to obtain vinyl flake montmorillonite; S1-2: 5 parts of spherical silica and 1.5 parts of vinyl silane coupling agent were added to an 80% aqueous ethanol solution and reacted at 55°C for 5.5 h. After cooling and drying, vinyl spherical silica was obtained. 7 parts of vinyl spherical silica, 1.5 parts of 1H,1H,2H,2H-perfluorodecyl mercaptan, and 0.03 parts of azobisisobutyronitrile were added to tetrahydrofuran and reacted at 60°C for 4 h. After drying, modified spherical silica was obtained. S1-3: 6.2 parts of polytrimethylene ether glycol, 4.5 parts of isophorone diisocyanate, and 0.045 parts of dibutyltin dilaurate were added to NMP and reacted at 50°C for 1.5 h. Then, 0.8 parts of 2,2-dimethylolpropionic acid and 0.4 parts of 7-hydroxyoctanoic acid were added and reacted for 1.5 h. Then, 0.8 parts of hydroxyethyl acrylate were added and stirred for 2.5 h. After cooling, 0.2 parts of triethylamine and 125 parts of deionized water were added and emulsified for 2 h. After defoaming, a hydrophobic double-bond-terminated polyurethane emulsion was obtained. S1-4: Mix 42 parts of hydrophobic double bond-terminated polyurethane emulsion, 4 parts of vinyl flake montmorillonite, 5 parts of modified spherical silica, 3 parts of lauryl methacrylate, 2 parts of butyl acrylate, and 0.45 parts of emulsifier at 78°C for 2.5 h, cool to room temperature, add 1.1 parts of adhesive and stir for 45 min to defoam, and obtain the film-forming solution; S1-5: The film-forming solution is evenly coated onto the base film, dried, and rolled up to obtain a waterproof and breathable film.

[0033] Comparative Example 1: Based on Example 1, without the addition of vinyl montmorillonite flakes; otherwise the same as Example 1, with the following specific differences: The method for preparing the waterproof membrane is as follows: S1-1: 5 parts of spherical silica and 1.5 parts of vinyl silane coupling agent were added to an 80% aqueous ethanol solution and reacted at 55°C for 5.5 h. After cooling and drying, vinyl spherical silica was obtained. 7 parts of vinyl spherical silica, 1.5 parts of 1H,1H,2H,2H-perfluorodecyl mercaptan, and 0.03 parts of azobisisobutyronitrile were added to tetrahydrofuran and reacted at 60°C for 4 h. After drying, modified spherical silica was obtained. S1-2: 6.2 parts of polytrimethylene ether glycol, 4.5 parts of isophorone diisocyanate, and 0.045 parts of dibutyltin dilaurate were added to NMP and reacted at 50°C for 1.5 h. Then, 0.8 parts of 2,2-dimethylolpropionic acid and 0.4 parts of 7-hydroxyoctanoic acid were added and reacted for 1.5 h. Then, 0.8 parts of hydroxyethyl acrylate were added and stirred for 2.5 h. After cooling, 0.2 parts of triethylamine and 125 parts of deionized water were added and emulsified for 2 h. After defoaming, a hydrophobic double-bond-terminated polyurethane emulsion was obtained. S1-3: Mix 42 parts of hydrophobic double bond-terminated polyurethane emulsion, 7 parts of modified spherical silica, 3 parts of lauryl methacrylate, 2 parts of butyl acrylate, and 0.45 parts of emulsifier at 78°C for 2.5 h, cool to room temperature, add 1.1 parts of adhesive and stir for 45 min to defoam, and obtain the film-forming solution. S1-4: The film-forming solution is evenly coated onto the base film, dried, and rolled up to obtain a waterproof and breathable film.

[0034] Comparative Example 2: Based on Example 1, the modified spherical silica was changed to vinyl spherical silica; the rest was the same as in Example 1.

[0035] Comparative Example 3: Based on Example 1, the ratio of modified spherical silica to vinyl montmorillonite was adjusted (modified spherical silica in excess); the rest was the same as in Example 1, with the following specific differences: S1-4: Mix 42 parts of hydrophobic double bond-terminated polyurethane emulsion, 4 parts of vinyl flake montmorillonite, 9 parts of modified spherical silica, 3 parts of lauryl methacrylate, 2 parts of butyl acrylate, and 0.45 parts of emulsifier at 78°C for 2.5 h, cool to room temperature, add 1.1 parts of adhesive and stir for 45 min to defoam, and obtain the film-forming solution; S1-5: The film-forming solution is evenly coated onto the base film, dried, and rolled up to obtain a waterproof and breathable film.

[0036] Performance Test 1: The lightweight waterproof jacket fabrics prepared in Example 1 and Comparative Examples 1-4 were tested in sequence for their weight, breathability, waterproofness, and moisture permeability. The test results are shown in Table 1. The air permeability reference standard GB / T 5453-1997 "Textiles - Determination of Air Permeability of Fabrics" is used. The test is conducted under a pressure of 100Pa until the machine balance point, and the average air permeability (air permeability) is recorded. The waterproof performance is referenced by the standard GB / T 32614-2023 "Outdoor Sports Clothing - Waterproof Jackets". The standard tests the waterproof performance of waterproof jackets and records the hydrostatic pressure data before washing and after 50 washes.

[0037] Table 1

[0038] Conclusion: The data in the table above show that the product prepared in this application has good lightweight, waterproof, breathable, and moisture-permeable properties, meeting the core usage requirements of lightweight waterproof jacket fabric. Data from Comparative Example 1 shows that without the addition of vinyl flake montmorillonite, the labyrinth effect is missing. Although the other components have some hydrophobicity, the lack of the labyrinth effect results in a significant decrease in hydrostatic pressure after washing. Data from Comparative Example 2 shows that by replacing modified spherical silica with vinyl flake montmorillonite, the filler lacks hydrophobic group modification, leading to decreased compatibility with other components and a decline in overall performance. Data from Comparative Example 3 shows that adjusting the ratio of modified spherical silica to vinyl flake montmorillonite (excessive modified spherical silica) increases the basis weight and makes it prone to aggregation, blocking the diffusion channels of water vapor molecules and resulting in a significant decrease in moisture permeability and breathability.

[0039] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a lightweight waterproof outerwear fabric, characterized in that: Includes the following steps: Step 1: The raw yarn is sequentially processed through warping, sizing, beam bonding, and weaving to obtain the woven fabric; Step 2: Stack the woven fabric, waterproof membrane, and inner layer in sequence, and use adhesive dots to bond the contact surfaces to obtain a lightweight waterproof jacket fabric.

2. The method for preparing a lightweight waterproof jacket fabric according to claim 1, characterized in that: The woven fabric is a plain weave checkered structure with a warp density to weft density ratio of (1.1~1.3):1 and a weight of 15~23 g / m². 2 The basis weight of the waterproof membrane is 8~12g / m³. 2 The weight of the inner layer of the fabric is 10~12 g / m². 2 .

3. The method for preparing a lightweight waterproof jacket fabric according to claim 1, characterized in that: In step 1, during the sizing process, acrylic sizing agent is used as the sizing liquid, with a sizing rate of 11-16%, a sizing temperature of 35-45℃, a drying chamber temperature of 135-145℃, a drying chamber temperature of 225-135℃, a cylinder temperature of 100-110℃, a cylinder temperature of 200-110℃, a cylinder temperature of 30-100℃, a cylinder temperature of 40-100℃, a cylinder temperature of 50-90℃, a sizing speed of 110-130m / min, a warp tension of 3-5kg, and a crimping tension of 3.5-5kg.

4. The method for preparing a lightweight waterproof jacket fabric according to claim 1, characterized in that: In step 1, during the weaving process, the machine speed is 400~500 r / min, the machine tension is 850~1050 N, the water outlet angle is 90~100°, the back beam height is -15~-25 mm, the angle is 10~25°, the heald frame height is 160~190 mm, the first heald frame opening is 55~65 mm, the heald leveling time is 340~350°, the water flow is 20~35 mm, and the water cutting angle is 16°. The cutting angle is 0~180°, the contact angle between the waterline and the reed is 275°~290°, the cutting time on the left is 5~15°, the cutting time on the right is 0°, the edge length is 2~4mm on the left and right, the length measuring rollers 1 and 2 are set to 188~192mm and 186~190mm respectively, the weft storage tension 1 and 2 are 70~85N and 70~85N respectively; the temperature and humidity of weaving are controlled at 25~30℃ and 60~70%.

5. The method for preparing a lightweight waterproof jacket fabric according to claim 1, characterized in that: In step 1, during the paralleling process, the number of paralleling shafts is 12 to 16, the tension of the shaft support is 5 to 9 kg, and the curling tension is 60 to 70 kg. During the warping process, the warping speed is 150~250m / min, the tension of the bobbin is 0.5~2kg, the curling tension is 3~5kg, and the pressure of the pressure roller is 0.2±0.03kg.

6. The method for preparing a lightweight waterproof jacket fabric according to claim 1, characterized in that: The method for preparing the waterproof membrane is as follows: Step 1: Mix hydrophobic double bond-terminated polyurethane emulsion, vinyl flake montmorillonite, modified spherical silica, lauryl methacrylate, butyl acrylate, and emulsifier at 75~80℃ for 2~3h, cool to room temperature, add adhesive and stir for 30~60min, defoam, and obtain film-forming solution. Step 2: Apply the film-forming solution evenly to the base film, dry it, and roll it up to obtain a waterproof and breathable film.

7. The method for preparing a lightweight waterproof jacket fabric according to claim 6, characterized in that: The raw materials of the film-forming solution include the following components: by weight, 40-45 parts of hydrophobic double-bond-terminated polyurethane emulsion, 3-5 parts of vinyl flake montmorillonite, 4-6 parts of modified spherical silica, 2.5-3.5 parts of lauryl methacrylate, 1.5-2.5 parts of butyl acrylate, 0.3-0.6 parts of emulsifier, and 0.7-1.5 parts of adhesive.

8. The method for preparing a lightweight waterproof jacket fabric according to claim 7, characterized in that: The method for preparing the vinyl flake montmorillonite is as follows: flake montmorillonite and vinyl silane coupling agent are added to an ethanol aqueous solution, reacted at 50~60℃ for 5~6h, cooled and dried to obtain vinyl flake montmorillonite; The modified spherical silica is prepared by adding spherical silica and vinyl silane coupling agent to an aqueous ethanol solution, reacting at 50-60°C for 5-6 hours, cooling and drying to obtain vinyl spherical silica; adding vinyl spherical silica, 1H,1H,2H,2H-perfluorodecylthiol and azobisisobutyronitrile to tetrahydrofuran, reacting at 55-65°C for 3-5 hours, and drying to obtain modified spherical silica.

9. The method for preparing a lightweight waterproof jacket fabric according to claim 7, characterized in that: The preparation method of the hydrophobic double bond-terminated polyurethane emulsion is as follows: polytrimethylene ether glycol, isophorone diisocyanate, and dibutyltin dilaurate are added to NMP and reacted at 45~55℃ for 1~2h. Then, 2,2-dimethylolpropionic acid and 7-hydroxyoctanoic acid are added and reacted for 1~2h. Hydroxyethyl acrylate is added and stirred for 2~3h. After cooling, triethylamine and deionized water are added and emulsified for 1~3h. After defoaming, the hydrophobic double bond-terminated polyurethane emulsion is obtained. The raw materials of the hydrophobic double-bond-terminated polyurethane emulsion include the following components by weight: 6-6.5 parts polytrimethylene ether glycol, 4-5 parts isophorone diisocyanate, 0.03-0.06 parts dibutyltin dilaurate, 0.6-1 part 2,2-dimethylolpropionic acid, 0.3-0.5 parts 7-hydroxyoctanoic acid, 0.5-1 part hydroxyethyl acrylate, 0.1-0.3 parts triethylamine, and 100-150 parts deionized water.

10. The lightweight waterproof jacket fabric prepared by the method of preparing a lightweight waterproof jacket fabric according to any one of claims 1 to 9.

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