Waterproof and moisture-permeable fabric with branch and leaf imitating structure and preparation method of waterproof and moisture-permeable fabric

Abstract

The invention belongs to the field of materials, and provides a waterproof and moisture permeable fabric with a branch and leaf imitating structure and a preparation method. The preparation method comprises the following steps: dissolving low-surface-energy polyurethane in a solvent to prepare a low-surface-energy polyurethane solution; and electrostatically spraying the low-surface-energy polyurethane solution to the fabric base material. According to the preparation method, the uniformly distributed wafer-shaped micro-nano structures are formed on the surface of the fabric, the nano wafers have hydrophobicity, water drops are difficult to unfold when making contact with the surface of the fabric and can rapidly form spheres and roll down, free circulation of water vapor inside and outside the fabric is not hindered, meanwhile, water permeation is effectively prevented, and the fabric has good moisture permeability. The waterproof performance of the fabric is greatly enhanced, the fabric is kept dry, stuffiness caused by long-time wearing is avoided, and the comfort level of a wearer is improved.

Description

Technical Field

[0001] This invention discloses a waterproof and breathable fabric with a branch-leaf structure and its preparation method, belonging to the field of materials. Background Technology

[0002] Waterproof and breathable fabrics effectively block the intrusion of external moisture while allowing moisture from the body to escape, providing a dry and comfortable environment for the wearer. Waterproof and breathable medical protective clothing effectively prevents liquid penetration, protecting the safety of medical personnel and reducing discomfort and fatigue caused by stuffiness and humidity. Waterproof and breathable clothing also blocks rainwater while allowing moisture from the body to pass through, keeping the body dry and enhancing the outdoor activity experience.

[0003] Polyurethane (PU) is an ideal choice for preparing waterproof and breathable materials using electrospinning technology due to its unique molecular designability and excellent mechanical properties. Waterproof and breathable polyurethane nanofiber membranes achieve their waterproof and breathable properties by controlling the diameter and pore structure of the electrospun fibers. The waterproof mechanism relies on the repulsion of water droplets by hydrophobic segments, while the breathability stems from the adsorption-diffusion of water vapor by polar groups and the permeable microporous structure. Currently, electrospun polyurethane nanofiber membranes still face the challenge of balancing waterproofness and breathability. Thick, dense electrospun polyurethane nanofiber membranes lack sufficient breathability, easily becoming wet and causing a sticky and uncomfortable feeling when worn; thin, sparse electrospun polyurethane nanofiber membranes have insufficient hydrophobic segment density and therefore insufficient waterproofness, failing to provide effective protection.

[0004] Patent CN102632648A provides a high-efficiency waterproof and breathable fabric and its preparation method. However, the fiber membrane prepared by this patent technology has low inter-fiber adhesion, low porosity, and large pore size, resulting in poor mechanical strength and difficulty in improving waterproof and breathable performance, thus limiting its practical application. Patent CN117779345A provides a method for preparing a polyurethane nanofiber waterproof and breathable membrane with surface-grown silicone nanofilaments. This method involves immersing a silica sol-doped polyurethane nanofiber membrane in a specific solution to react, causing silicone nanofilaments to grow on the surface of the nanofiber membrane. While this method can improve the waterproof and breathable performance of the fiber membrane to some extent, its crosslinking reaction time is long, the amount of crosslinking solution used is large, and the degree of crosslinking is difficult to control.

[0005] Therefore, it is evident that there are still many areas for improvement in the electrospinning process for preparing polyurethane waterproof and breathable fabrics. Researching and developing a fabric with a simple process and excellent waterproof and breathable properties is of great significance. Summary of the Invention

[0006] [Technical Issues]

[0007] Current electrospun polyurethane waterproof and breathable fabrics require stringent preparation conditions and involve complex processes, resulting in fabrics with insufficient mechanical properties and an inability to balance waterproofness and breathability. There is a need for an electrospun polyurethane fabric with a simpler process that combines excellent waterproof and breathable properties with superior mechanical properties.

[0008] [Technical Solution]

[0009] To address the aforementioned problems, this invention combines the advantages of electrospinning and electrospraying to propose a method for preparing a waterproof and breathable fabric with a branch-leaf-like structure. By combining electrospinning and electrospraying, a polyurethane nanosheet-like structure mimicking the morphology of plant branches and leaves is obtained, such as… Figure 1 As shown, the nano discs are evenly distributed and firmly attached to the fabric substrate, adhering smoothly to the fibers and not easily falling off, giving the fabric excellent waterproof and breathable properties.

[0010] The first objective of this invention is to provide a method for preparing a waterproof and breathable fabric with a branch-like structure, comprising the following steps:

[0011] (1) Dissolve low surface energy polyurethane in a solvent to obtain a low surface energy polyurethane solution;

[0012] (2) Electrostatically spray a low surface energy polyurethane solution onto the fabric substrate.

[0013] In one embodiment, the low surface energy polyurethane in step (1) is a polyurethane whose surface free energy is reduced and hydrophobicity is improved by introducing low surface energy groups or by surface treatment. Low surface energy groups are mainly of two types: organofluorine groups and organosilicon groups, including fluorocarbon chains, polysiloxane groups, etc.

[0014] In one embodiment, the low surface energy polyurethane in step (1) is a fluorinated polyurethane. Fluorinated polyurethane is a polyurethane with fluorinated groups introduced into its molecular backbone or side chains, thereby possessing low surface energy and excellent hydrophobic and oleophobic properties. The fluorinated groups include one or more of -CF3, -CF2-, and -CF2O-.

[0015] In one embodiment, the solvent in step (1) is selected from one or more of diacetone alcohol, dimethylacetamide, dimethylformamide, and ethanol.

[0016] In one embodiment, the low surface energy polyurethane solution in step (1) has a mass percentage of 1-30 wt%; preferably 15-25 wt%. The electrostatic spray solution of low surface energy polyurethane is more easily stretched into a disc shape and adhered to the substrate under an electrostatic field.

[0017] In one embodiment, the low surface energy polyurethane solution from step (1) is defoamed before step (2).

[0018] In one embodiment, the fabric substrate in step (2) is selected from one of meltblown nonwoven fabric, spunbond nonwoven fabric, and electrospun nanofiber membrane.

[0019] In one embodiment, the electrospun nanofiber membrane is selected from polyurethane nanofiber membrane or polyacrylonitrile nanofiber.

[0020] In one embodiment, the meltblown nonwoven fabric is a polyester nonwoven fabric or a polypropylene nonwoven fabric; the spunbond nonwoven fabric is a polyester nonwoven fabric or a polypropylene nonwoven fabric.

[0021] In one embodiment, the method for preparing a polyurethane nanofiber membrane for a fabric substrate includes the steps of: dissolving polyurethane, a hydrophobic agent, and lithium chloride in a solvent to obtain an electrospinning solution, and electrospinning the electrospinning solution onto a receiving substrate.

[0022] The mass percentage of polyurethane in the electrospinning solution is 10–18 wt%, preferably 12–16 wt%; the mass percentage of the hydrophobic agent is 0.5–3.5 wt%, preferably 1.5–2.5 wt%; and the mass percentage of lithium chloride is 0.001–0.008 wt%, preferably 0.003–0.005 wt%.

[0023] The hydrophobic agent is selected from one or more of fluorinated polyurethane, long-chain fluorinated polyurethane, fluorinated acrylate copolymer, and non-fluorinated organosilicon compounds;

[0024] The solvent is selected from one or more of diacetone alcohol, dimethylacetamide, dimethylformamide, and ethanol;

[0025] The receiving substrate is selected from one of the following: varnished paper, release paper, textiles, metal mesh, and aluminum foil;

[0026] The parameters for electrospinning are: temperature 15-25℃, humidity 25-35%, voltage 25-35kV, syringe injection speed 0.4-0.8ml / h, spinning distance 15-30cm, roller speed 40-60r / min, and electrospinning time 0.3-0.8h.

[0027] In one embodiment, the electrostatic spraying process parameters in step (2) are: voltage 20-40kV, ambient temperature 10-30℃, ambient humidity 25-45%, roller speed 30-80r / min, injection speed 0.1-0.8ml / h, spraying distance 15-30cm, and spinning time 0.2-0.8h.

[0028] In one embodiment, the preferred electrostatic spraying process parameters for step (2) are: voltage 25-35kV, ambient temperature 15-25℃, ambient humidity 25-45%, roller speed 40-60r / min, injection speed 0.1-0.3ml / h, spraying distance 20-30cm, and spinning time 0.4-0.6h.

[0029] The second objective of this invention is to provide a waterproof and breathable imitation branch and leaf structure fabric prepared by the above-described method.

[0030] A third objective of this invention is to provide applications of the above-mentioned waterproof and breathable imitation branch and leaf structure fabric in the textile field, including applications in medical protective clothing and outdoor clothing.

[0031] Beneficial effects:

[0032] The advantages and effects of this invention are mainly reflected in the following aspects:

[0033] First, by using low surface energy polyurethane as the solute in the electrostatic spray solution, combined with specific solvents and process parameters, this invention successfully prepared a fabric with a branch-like structure. This fabric surface exhibits uniformly distributed circular micro / nano structures, significantly enhancing its waterproof performance. The nano-discs are hydrophobic; water droplets, upon contact with the fabric surface, struggle to spread out and instead quickly form spheres and roll off, effectively preventing moisture penetration, maintaining fabric dryness, and improving wearer comfort. This method is suitable for medical protective clothing and outdoor apparel.

[0034] Secondly, while being waterproof, the fabric also boasts excellent breathability. This is thanks to its microporous design mimicking the structure of branches and leaves. The evenly distributed nano-shimmering flakes do not hinder the free flow of water vapor inside and outside the fabric, allowing it to effectively wick away moisture and reduce discomfort caused by sweating. This also prevents the stuffiness that can result from prolonged wear, which is especially important for medical staff who wear surgical gowns for extended periods.

[0035] Furthermore, the preparation process of this invention is simple, the process parameters are easy to control, and the production difficulty is low. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the imitation branch and leaf structure material produced in this invention.

[0037] Figure 2 The effect of polyurethane concentration on the morphology of the waterproof and breathable imitation branch and leaf structure fabric in Example 1.

[0038] Figure 3 The effect of spray distance on the morphology of the waterproof and breathable imitation branch and leaf structure fabric of Example 1.

[0039] Figure 4The influence of the fabric substrate on the morphology of the waterproof and breathable imitation branch and leaf structure fabric in Example 2.

[0040] Figure 5 The effect of polyurethane concentration on the morphology of the waterproof and breathable imitation branch and leaf structure fabric in Example 2.

[0041] Figure 6 The effect of spray distance on the morphology of the waterproof and breathable imitation branch and leaf structure fabric in Example 2.

[0042] Figure 7 These are the results of the water resistance performance test. Detailed Implementation

[0043] The fluorinated polyurethane used in the following examples and comparative examples is the oil-based water-repellent agent QF99-4 from Taifu Chemical Technology (Shanghai) Co., Ltd.

[0044] The preparation methods of the polyurethane nanofiber membrane substrates used in the following examples and comparative examples include the following steps:

[0045] (1) Dissolve 14 parts of polyurethane, 2 parts of fluorinated polyurethane and 0.004 parts of lithium chloride in 83.996 parts of dimethylacetamide and stir magnetically at room temperature for 6 hours to obtain an electrospinning solution.

[0046] To facilitate weighing, a 0.1% lithium chloride solution can be prepared in advance using dimethylacetamide as a solvent. Then, when preparing the electrospinning solution, weigh 4 parts of the lithium chloride solution to obtain 0.004 parts of lithium chloride.

[0047] (2) Select glossy paper as the receiving substrate for electrospinning, and use the electrospinning solution prepared in step (1) for electrospinning. The specific parameters are: temperature 20℃, humidity 30%, voltage 30kV, syringe injection speed 0.6ml / h, spinning distance 25cm, roller speed 50r / min, and electrospinning time 0.5h.

[0048] Example 1

[0049] A method for preparing a waterproof and breathable fabric with a branch-like structure includes the following steps:

[0050] (1) Dissolve 8 parts of fluorinated polyurethane in 92 parts of diacetone alcohol, stir with a glass rod for 1 min at room temperature, let stand for 10 min to eliminate bubbles, and obtain a low surface energy polyurethane solution with a polyurethane concentration of 8%.

[0051] (2) The low surface energy polyurethane solution was electro-sprayed onto the needle-punched cotton nonwoven fabric by electrostatic spraying. The process parameters of electrostatic spraying were: temperature 20℃, humidity 40%, voltage 30kV, injection speed 0.8ml / h, spraying distance 15cm, roller speed 50r / min, and electrostatic spraying duration 0.5h.

[0052] Based on Example 1, the polyurethane concentration of the low surface energy polyurethane solution was adjusted to 0.5%, 1%, 2%, 8%, 15%, 25%, 40%, and 60% to obtain a series of electrosprayed fabrics.

[0053] pass Figure 2 It can be seen that when the polyurethane concentration of the low surface energy polyurethane solution is 0.5%, it cannot form nano discs on the fiber substrate, only fine, irregular particles. From a concentration of 1%... Figure 2 Starting with the left image, relatively regular nanosheets can be formed. At a concentration of 15% (…),… Figure 2 (See middle image) When the polyurethane concentration is 40%, the nano-discs form better. Figure 2 (See right figure) At 60%, nano discs cannot be formed, and the polyurethane completely cures and coats the fiber surface without leaving any gaps.

[0054] Based on Example 1, the syringe infusion rate was adjusted to 0.2ml / h, 0.8ml / h, 1ml / h, 1.4ml / h, and 2ml / h to obtain a series of electrospray fabrics.

[0055] When the syringe infusion rate was 0.2 ml / h and 0.8 ml / h, the nano discs formed well. However, at 1 ml / h, 1.4 ml / h and 2 ml / h, the nano discs could not be formed at all, and the polyurethane solidified and wrapped around the surface of the substrate fiber like a shell. As the infusion rate increased, the thickness of the solidified shell of the electrostatic spray solution on the surface of the substrate fiber became larger and larger.

[0056] Based on Example 1, the spraying distance was adjusted to 5cm, 25cm, and 37cm to obtain a series of electro-sprayed fabrics.

[0057] like Figure 3 As shown, when the spray distance is 5cm ( Figure 3 (Left image) Polyurethane adheres extensively to the substrate fibers. At a spray distance of 25cm ( Figure 3 (See middle image) This process can form regular nano discs that adhere to fibers. When the spray distance is 37cm (…), Figure 3 (Right image) The nano discs on the substrate fiber neither adhere to the fiber nor have a complete shape.

[0058] Based on Example 1, the humidity was adjusted to 30%, 40%, and 85% to obtain a series of electro-sprayed fabrics.

[0059] Uniform and regular nanosheets can be formed under all three humidity levels mentioned above. Observation using F-SEM shows that the nanosheets at lower humidity have more defined outlines than those at higher humidity. However, there is no significant difference in distribution or roundness.

[0060] In summary, the optimal process parameters for electrostatic spraying on nonwoven fabrics are: ambient humidity 40%, electrostatic spray solution concentration 15%, injection speed 0.2 ml / h, and spraying distance 25 cm.

[0061] Example 2

[0062] A method for preparing a waterproof and breathable fabric with a branch-like structure includes the following steps:

[0063] (1) Dissolve 15 parts of fluorinated polyurethane in 85 parts of diacetone alcohol, stir with a glass rod for 1 min at room temperature, let stand for 10 min to eliminate bubbles, and obtain a low surface energy polyurethane solution with a polyurethane concentration of 15%.

[0064] (2) The low surface energy polyurethane solution was electrosprayed onto the polyurethane nanofiber membrane substrate by electrostatic spraying. The process parameters of electrostatic spraying were: temperature 20℃, humidity 40%, voltage 30kV, injection speed 0.2ml / h, spraying distance 25cm, roller speed 50r / min, and electrostatic spraying duration 0.5h.

[0065] Based on Example 2, the fabric substrate was adjusted to carbon fiber cloth, aluminum foil, cover glass, and plastic wrap to obtain a series of electro-sprayed materials.

[0066] Observation using a scanning electron microscope (SEM) revealed that when polyurethane nanofiber membranes were used as the electrostatic spraying substrate (…), Figure 4 (Right image) The polyurethane nanosheets produced by electrostatic spraying exhibit the best morphology, meaning they are closest to a circle in shape, best adhere to the nanofiber surface, have the most uniform thickness, and the most uniform distribution. However, when carbon fiber cloth is used as the substrate (…), Figure 4 (Left image) The nanosheets exhibit obvious irregularities and unevenness. Other substrates cannot form nanosheets.

[0067] Based on Example 2, the polyurethane concentration of the low surface energy polyurethane solution was adjusted to 1%, 5%, 10%, 15%, 25%, and 35% to obtain a series of electrosprayed fabrics.

[0068] Observation using scanning electron microscopy (SEM) revealed that when the electrostatic spray solution concentration was 1%, nanosheets could not be formed on the fibers of the substrate. A concentration of 5% (…) Figure 5 (Left figure), 10%, 35% Figure 5 When the concentration of the electrostatic spray solution is 15% and 25% (as shown in the right figure), the formed nanosheets are neither uniform nor adhered to the fibers. Figure 5 In both cases (see figure 1), good nano-discs can be formed. Comparing the two, the polyurethane nanofiber membrane with a 25% electrostatic spray solution concentration showed significantly more nano-discs and a more uniform distribution than the membrane with a 15% concentration.

[0069] Based on Example 2, the spraying distance was adjusted to 5cm, 15cm, and 35cm to obtain a series of electro-sprayed fabrics.

[0070] When the spray distance is 5cm, 15cm ( Figure 6 (Left picture), 35cm Figure 6 When the spraying distance was 25cm (as shown in the right figure), the electrostatic spraying effect was not good; however, when the spraying distance was 25cm (as shown in the right figure), the effect was not good. Figure 6 (See the middle image) When the polyurethane nanofiber membrane is in the middle, the nano-disc forming effect is the best.

[0071] In summary, the optimal process parameters for electrostatic spraying on polyurethane nanofiber membranes obtained from Example 2 are: electrostatic spray solution concentration of 25% and spraying distance of 25cm.

[0072] Example 3

[0073] The only difference from Example 2 is that the polyurethane concentration of the low surface energy polyurethane solution is 25%.

[0074] Example 4

[0075] The only difference from Example 2 is that the polyurethane concentration of the low surface energy polyurethane solution is 35%.

[0076] Comparative Example 1

[0077] Untreated polyurethane nanofiber membrane.

[0078] Table 1

[0079]

[0080] The roll-off angles of Examples 3-5 and Comparative Example 1 were tested, and the results are shown in Table 1. Six liquids—water, cola, coffee, blood, urine, and tea—were dropped onto a polyurethane nanofiber membrane at a 90° tilt. None of these droplets rolled off the un-electroplated polyurethane nanofiber membrane substrate. However, after electro-spraying, the roll-off angles of some liquids significantly decreased. When the polyurethane concentration of the low surface energy polyurethane solution was 25% (for optimal wafer forming), the roll-off angles of water, coffee, and blood were the smallest.

[0081] Unsprayed polyurethane nanofiber membranes consist of overlapping nanofibers forming a one-dimensional nanofiber network with relatively large pores. When droplets are placed on this surface, they easily penetrate into the pores of the fiber network. In this state, the solid-liquid contact area is large, resulting in high contact hysteresis and strong adhesion. The droplet needs to overcome a large amount of energy to roll, thus exhibiting a large roll-off angle. In contrast, electrosprayed polyurethane nanofiber membranes have a micro-nano hierarchical structure with discs attached to the fibers, significantly reducing the solid-liquid contact area. When a droplet contacts this surface, its bottom cannot fully penetrate this fine hierarchical structure; instead, it is held at the top of the discs, trapping a large amount of air beneath the droplet. Since air is a perfect hydrophobic medium, this greatly reduces the adhesion of the droplet to the solid surface. Therefore, the droplet roll-off angle is reduced after electrospraying.

[0082] Furthermore, while conventional polyurethane possesses some hydrophobicity, it contains polar groups such as ester and urethane groups. These polar groups can form strong intermolecular forces with water droplets, such as hydrogen bonds. This results in a relatively high surface energy for conventional polyurethane, thus increasing its adhesion to water. Fluorinated polyurethane, on the other hand, introduces a large number of carbon-fluorine bonds. Carbon-fluorine bonds are among the highest-energy and lowest-polarity chemical bonds in nature, thus exhibiting lower surface energy. When polyurethane and fluorinated polyurethane nanosheets are co-constructed into a micro / nano structure, a synergistic effect occurs, reducing the adhesion of water droplets to the fiber membrane and making it easier for water droplets to roll off the fiber membrane surface.

[0083] The water permeability of a polyurethane nanofiber membrane that has not undergone electrospraying (Comparative Example 1) and a polyurethane nanofiber membrane with the best polyurethane nanosheet morphology (Example 3) were tested using a YG(B)812 fabric water permeability tester. Figure 7 As shown, the former measured 282 mmH2O, while the latter measured 872 mmH2O. It is obvious that the water resistance of the electro-sprayed polyurethane nanofiber membrane is significantly better than that of the un-electroprayed polyurethane nanofiber membrane.

[0084] The air permeability of Examples 3-5 and Comparative Example 1 was tested, with a test area of ​​20 cm². 2 The constant pressure flow measurement mode and a test pressure of 100 Pa were selected, and the results are shown in Table 2. The polyurethane nanofiber membrane without electro-spraying had the highest air permeability. The air permeability of the fabrics produced by electro-spraying with a polyurethane concentration of 15% (Example 2) and 25% (Example 3) was reduced; while the air permeability was significantly reduced by electro-spraying with a polyurethane concentration of 35% (Example 4).

[0085] Table 2

[0086] Test pressure 100Pa Uninjected 15% concentration of electronic fuel injection 25% concentration of electronic fuel injection 35% concentration of electronic fuel injection air permeability 34.21mm / s 33.69mm / s 31.47mm / s 25.50mm / s

[0087] When using 25% concentration electro-spraying, which has the best effect on disc forming, the air permeability of the electro-sprayed polyurethane nanofiber membrane is slightly lower than that of the non-electroplated substrate, while the improvement effect on the droplet roll-off angle of various liquids is significantly better, and the hydrostatic pressure is significantly improved compared with the non-electroplated substrate.

[0088] The embodiments provided above are not intended to limit the scope of the invention, nor are the described steps intended to limit the order of execution. Any obvious modifications made to the invention by those skilled in the art based on existing common knowledge also fall within the scope of protection defined by the claims.

Claims

1. A method for preparing a waterproof and moisture-permeable imitation branch and leaf structure fabric, characterized by, The preparation method comprises the steps of: (1) dissolving the low surface energy polyurethane in a solvent to obtain a low surface energy polyurethane solution; (2) electrostatically spraying the low surface energy polyurethane solution onto a fabric substrate.

2. The production method according to claim 1, characterized by, In step (1), the low surface energy polyurethane is a polyurethane with reduced surface free energy and improved hydrophobicity by introducing low surface energy groups or through surface treatment.

3. The preparation method according to claim 1, characterized in that, In step (1), the solvent is selected from one or more of diacetone alcohol, dimethylacetamide, dimethylformamide, and ethanol.

4. The production method according to claim 1, characterized by, In step (1), the mass percentage of the low surface energy polyurethane in the low surface energy polyurethane solution is 1-30 wt%.

5. The preparation method according to claim 1, characterized in that, In step (2), the fabric substrate is selected from one of melt-blown non-woven fabric, spun-bond non-woven fabric, and electrospun nanofiber membrane.

6. The production method according to claim 5, wherein The preparation method of the polyurethane nanofiber membrane comprises the steps of dissolving polyurethane, a hydrophobic agent, and lithium chloride in a solvent to obtain an electrospinning solution, and electrospinning the electrospinning solution onto a receiving substrate.

7. The preparation method of claim 6, wherein, The mass percentage of the polyurethane in the electrospinning solution is 10-18 wt%, preferably 12-16 wt%; the mass percentage of the hydrophobic agent is 0.5-3.5 wt%, preferably 1.5-2.5 wt%; and the mass percentage of the lithium chloride is 0.001-0.008 wt%, preferably 0.003-0.005 wt%. The hydrophobic agent is selected from one or more of fluorine-containing polyurethane, long-chain fluorinated polyurethane, fluorine-containing acrylate copolymer, and fluorine-free organic silicon compound. The solvent is selected from one or more of diacetone alcohol, dimethylacetamide, dimethylformamide, and ethanol. The receiving substrate is selected from one of glossy paper, release paper, textile, metal mesh, and aluminum foil. The electrospinning parameters are: temperature 15-25℃, humidity 25-35%, voltage 25-35kV, needle tube infusion speed 0.4-0.8ml / h, spinning distance 15-30cm, roller speed 40-60r / min, and electrospinning time 0.3-0.8h.

8. The method of claim 1, wherein, In step (2), the electrostatic spraying process parameters are: voltage 20-40kV, ambient temperature 10-30℃, ambient humidity 25-45%, roller speed 30-80r / min, infusion speed 0.1-0.8ml / h, spraying distance 15-30cm, and spinning time 0.2-0.8h.

9. The waterproof and moisture-permeable imitation branch and leaf structure fabric prepared by the preparation method of any one of claims 1-8.

10. The waterproof and moisture-permeable imitation branch and leaf structure fabric of claim 9 for use in the field of textiles.

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