Vacuum nanometer waterproof breathable fabric and preparation method thereof

Abstract

The invention relates to a vacuum nano waterproof breathable fabric and a preparation method thereof. The fabric comprises an inner layer, a waterproof surface layer and a composite middle layer connected between the inner layer and the waterproof surface layer, the composite middle layer comprises a first supporting layer and a second supporting layer which are oppositely arranged and used for being connected with the opposite faces of the inner layer and the waterproof face layer respectively, grooves are symmetrically formed in the first supporting layer and the second supporting layer, and a cavity is formed between the grooves of the first supporting layer and the second supporting layer. And at least two tear-resistant supporting structures are arranged in the cavity. By means of the structural design that the first vertical supporting piece, the second vertical supporting piece, the reinforcing layer, the breathable rib pipes and the protective blocking seat part are formed between the first supporting layer and the second supporting layer, the transverse and longitudinal tensile resistance and rebound resilience of the fabric can be remarkably improved at the same time, so that the fabric is not prone to deformation and durable, and the service life of the fabric is prolonged. Meanwhile, the down-proof effect of the fabric can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of clothing fabrics, and in particular relates to a vacuum nano waterproof breathable fabric and a preparation method thereof. Background Art

[0002] Down jackets are important clothing for keeping warm in winter. In order to adapt to different weather conditions, such as rain and snow, general fabrics have good waterproof and breathable effects. In the existing technology, vacuum nano-coating technology can be used to form a continuous and uniform nano-waterproof coating on the surface of the fabric. In addition, the down jacket fabric also needs to adapt to various stretching movements during human activities. Therefore, the down jacket fabric is also required to have good tensile resistance and resilience. This can ensure that it is not easy to tear or deform during wearing and reduce the leakage of down. However, in the existing technology, there is little research on improving the design of the fabric structure to enhance the tensile resistance and resilience of the fabric. To this end, we provide a vacuum nano-waterproof and breathable fabric and a preparation method thereof to solve the above technical problems. Summary of the invention

[0003] The purpose of the present invention is to provide a vacuum nano waterproof breathable fabric and a preparation method thereof in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0005] A vacuum nano waterproof breathable fabric comprises an inner layer, a waterproof surface layer and a composite middle layer connected between the inner layer and the waterproof surface layer;

[0006] The composite middle layer comprises a supporting layer 1 and a supporting layer 2 which are arranged opposite to each other and are used to connect to opposite sides of the inner layer and the waterproof surface layer respectively, the supporting layer 1 and the supporting layer 2 are symmetrically provided with grooves, a cavity is formed between the grooves of the supporting layer 1 and the supporting layer 2, and at least two tear-resistant supporting structures are provided inside the cavity;

[0007] The tear-resistant support structure includes a vertical support member 1 and a vertical support member 2 which are arranged diagonally and are respectively arranged on a support layer 1 and a support layer 2. The vertical support member 1 and the vertical support member 2 both include a fixing portion and a sewing portion. The fixing portion is connected to the inner wall of the groove. The sewing portions of the vertical support member 1 and the vertical support member 2 are vertically overlapped with each other and a hollow air rib tube is arranged in the middle. The two sewing portions vertically overlapped with each other above and below the air rib tube are sewn and fixed together by sewing lines to form a reinforcement layer.

[0008] As a further optimization scheme of the present invention, the vertical support member 1 and the vertical support member 2 further include a protective stopper located on a side of the fixing portion away from the sewing portion, the protective stopper being located on the outer circle of the sewing portion and used to support the air permeable rib tube and the sewing portion wrapped outside the air permeable rib tube;

[0009] The protective stop seat parts of the vertical support member 1 and the vertical support member 2 of two adjacent tear-resistant support structures are fixed together by hot pressing.

[0010] As a further optimization solution of the present invention, the support layer 1, the support layer 2, the vertical support member 1, the vertical support member 2, the air-permeable rib tube and the protective baffle seat are all made of polyamide material or polypropylene material.

[0011] A method for preparing a vacuum nano waterproof breathable fabric, the specific steps are as follows:

[0012] Step 1: Support layer 1 and support layer 2 are extruded on the surface of the inner layer and the composite middle layer through a mold, respectively, and grooves are provided on the support layer 1 and the support layer 2. At least two vertical support members 1 and 2 are extruded on the inner walls of the grooves of the support layer 1 and the support layer 2 through a mold, respectively, and the vertical support members 1 and 2 each include a fixing portion and a sewing portion, and a hollow air permeable rib tube is extruded through a mold;

[0013] Step 2: Place the inner layer and the composite middle layer with the support layer 1 and the support layer 2 on one side corresponding to each other, make the grooves on the support layer 1 and the support layer 2 correspond to each other, make the sewing parts of the vertical support member 1 and the vertical support member 2 corresponding to each other vertically overlap and place the air-permeable rib tube in the middle, and sew and fix the vertical support member 1 and the vertical support member 2 located above and below the air-permeable rib tube together through sewing lines to form reinforcement layers respectively, so as to prepare a tear-resistant support structure;

[0014] Step 3: Hot press the inner layer, the waterproof surface layer, and the two adjacent grooves of the support layer 1 and the support layer 2 together to obtain a waterproof and breathable fabric.

[0015] As a further optimization solution of the present invention, in step 1, the vertical support member 1 and the vertical support member 2 further include a protective stop seat portion connected to a side of the fixing portion away from the sewing portion;

[0016] In step two, after sewing to form a reinforcement layer, the protective seat parts of the vertical support member 1 and the vertical support member 2 of the two adjacent tear-resistant support structures are fixed together by hot pressing. The pressure of the hot pressing treatment is 3-5MPa, the temperature is 105-120°C, the number of hot pressing times is 2-4 times, and the time for each hot pressing is 2-4 minutes.

[0017] As a further optimization scheme of the present invention, in step three, the pressure of the hot pressing treatment is 4-7 MPa, the temperature is 135-145° C., the number of hot pressing times is 3-5 times, and the time of each hot pressing is 2-4 minutes.

[0018] The beneficial effects of the present invention are:

[0019] 1) The present invention can significantly improve the transverse and longitudinal tensile resistance and resilience of the fabric by forming a vertical support member 1, a vertical support member 2, a reinforcement layer, a breathable rib tube, and a protective seat between the support layer 1 and the support layer 2, so that the fabric is not easily deformed and durable, and at the same time, the anti-down drilling effect of the fabric can be improved;

[0020] 2) The present invention forms a reinforcement effect between the cavities formed by the grooves of the support layer 1 and the support layer 2 through the vertical support member 1 and the vertical support member 2, and forms a reinforcement effect between the cavities formed by the grooves of the support layer 1 and the support layer 2, thereby increasing the structural stability. The structural design of the air-permeable rib tube and the protective blocking seat forms a left and right limiting resistance effect and a front and back reinforcement effect between the vertical support member 1 and the vertical support member 2, thereby significantly improving the transverse and longitudinal tensile resistance and resilience of the fabric;

[0021] 3) The present invention divides the cavity formed between the grooves of the support layer 1 and the support layer 2 into multiple spaces through the structural design of the vertical support member 1 and the vertical support member 2, thereby increasing the complexity of the space. The reinforcement layer, the breathable rib tube and the protective blocking seat increase the vertical and horizontal connection stability between the vertical support member 1 and the vertical support member 2, thereby making the fabric have a better anti-down drilling effect and can still maintain a good anti-down drilling effect after multiple washings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of the vacuum nano waterproof breathable fabric of Example 1 of the present invention.

[0023] Figure 2 Schematic diagram of the cross section of the composite middle layer of Example 1 of the present invention.

[0024] Figure 3 Schematic diagram of the cross section of the composite middle layer of Example 2 of the present invention.

[0025] Figure 4 Schematic cross-sectional view of the tear-resistant support structure of the present invention.

[0026] Figure 5 It is a schematic cross-sectional view of the composite middle layer of Comparative Example 1 of the present invention.

[0027] Figure 6 It is a schematic cross-sectional view of the composite middle layer of Comparative Example 2 of the present invention.

[0028] Figure 7 It is a schematic cross-sectional view of the composite middle layer of Comparative Example 3 of the present invention.

[0029] In the figure: 1, inner layer; 2, composite middle layer; 21, support layer one; 22, support layer two; 23, vertical support member one; 24, vertical support member two; 25, reinforcement layer; 26, breathable rib tube; 27, protective seat; 3, waterproof surface layer. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0031] 1. Materials

[0032] 1. In the present application, the inner layer 1 is a commercially available pure cotton fabric, and the waterproof surface layer 3 is a commercially available 180T polyester pongee fabric. In order to achieve a waterproof effect, a waterproof layer is formed on the surface of the commercially available 180T polyester pongee fabric by vacuum nano-coating technology.

[0033] 2. The sewing thread in this application is cotton fiber thread.

[0034] The methods used in this example are conventional methods known to those skilled in the art unless otherwise specified, and the reagents and other materials used are commercially available products unless otherwise specified.

[0035] 2. Methods

[0036] In order to explore the effects of different structural designs of the composite middle layer 2 on the tensile strength, resilience and anti-down performance of the vacuum nano waterproof breathable fabric, the following technical solutions of Examples 1-2 and Comparative Examples 1-3 were designed, as shown below:

[0037] Example 1

[0038] like Figure 1-2 As shown, a vacuum nano waterproof breathable fabric comprises an inner layer 1, a waterproof surface layer 3 and a composite middle layer 2 for connecting between the inner layer 1 and the waterproof surface layer 3; the composite middle layer 2 comprises a supporting layer 1 21 and a supporting layer 2 22 which are arranged opposite to each other and are used to connect to opposite sides of the inner layer 1 and the waterproof surface layer 3 respectively, the supporting layer 1 21 and the supporting layer 2 22 are symmetrically provided with grooves, a cavity is formed between the grooves of the supporting layer 1 21 and the supporting layer 2 22, and at least two tear-resistant supporting structures are provided inside the cavity;

[0039] The tear-resistant support structure includes a vertical support member 23 and a vertical support member 24 which are arranged diagonally and are respectively arranged on a support layer 1 21 and a support layer 2 22, wherein the vertical support member 23 and the vertical support member 24 both include a fixing portion and a sewing portion, wherein the fixing portion is connected to the inner wall of the groove, and the sewing portions of the vertical support member 23 and the vertical support member 24 are vertically overlapped with each other and a hollow air rib tube 26 is arranged in the middle, and the two sewing portions vertically overlapped with each other above and below the air rib tube 26 are sewn and fixed together by sewing lines to form a reinforcement layer 25.

[0040] In this embodiment, the support layer 1 21, the support layer 2 22, the vertical support member 1 23, the vertical support member 24, and the air-permeable rib tube 26 are all made of polyamide material or polypropylene material.

[0041] A method for preparing a vacuum nano waterproof breathable fabric, the specific steps are as follows:

[0042] Step 1: A support layer 1 21 and a support layer 2 22 are extruded on the surface of the inner layer 1 and the composite middle layer 2 through a mold, respectively. The support layer 1 21 and the support layer 2 22 both have grooves, and at least two vertical support members 1 23 and a vertical support member 2 24 are extruded on the inner walls of the grooves of the support layer 1 21 and the support layer 2 22 through a mold, respectively. The vertical support member 1 23 and the vertical support member 24 both include a fixing portion and a sewing portion, and a hollow air permeable rib tube 26 is extruded through a mold;

[0043] Step 2: Place the inner layer 1 and the composite middle layer 2 with the support layer 1 21 and the support layer 2 22 on one side thereof corresponding to each other, so that the grooves on the support layer 1 21 and the support layer 2 22 correspond to each other, and vertically overlap the sewn parts of the vertical support member 1 23 and the vertical support member 2 24 corresponding to each other, and place the air-permeable rib tube 26 in the middle thereof, and sew and fix the vertical support member 1 23 and the vertical support member 2 24 at the vertical overlapping positions above and below the air-permeable rib tube 26 together by sewing lines to form reinforcement layers 25 respectively, so as to prepare a tear-resistant support structure;

[0044] Step 3: hot-press and fix the inner layer 1, the waterproof surface layer 3, and the two adjacent grooves of the support layer 1 21 and the support layer 2 22 together to obtain a waterproof and breathable fabric;

[0045] In step three of this embodiment, the pressure of the hot pressing treatment is 6 MPa, the temperature is 140° C., the number of hot pressing times is 4 times, and the time of each hot pressing is 4 minutes.

[0046] Example 2

[0047] like Figure 1 , 34, a vacuum nano waterproof breathable fabric, based on Example 1, in this embodiment, the vertical support member 1 23 and the vertical support member 2 24 further include a protective stopper 27 located on the side of the fixed portion away from the sewing portion, and the protective stopper 27 is located on the outer circle of the sewing portion and is used to support the air permeable rib tube 26 and the sewing portion wrapped outside the air permeable rib tube 26;

[0048] The protective stop seat portions 27 of the vertical support member 1 23 and the vertical support member 2 24 of two adjacent tear-resistant support structures are fixed together by heat pressing.

[0049] In this embodiment, the support layer 1 21, the support layer 2 22, the vertical support member 1 23, the vertical support member 24, the air-permeable rib tube 26 and the protective blocking seat 27 are all made of polyamide material or polypropylene material.

[0050] A method for preparing a vacuum nano waterproof breathable fabric, the specific steps are as follows:

[0051] Step 1: A support layer 1 21 and a support layer 2 22 are extruded on the surface of the inner layer 1 and the composite middle layer 2 through a mold, respectively. The support layer 1 21 and the support layer 2 22 both have grooves, and at least two vertical support members 1 23 and a vertical support member 2 24 are extruded on the inner walls of the grooves of the support layer 1 21 and the support layer 2 22 through a mold, respectively. The vertical support member 1 23 and the vertical support member 24 both include a fixing portion, a sewing portion, and a protective stopper portion 27 connected to a side of the fixing portion away from the sewing portion, and a hollow air permeable rib tube 26 is extruded through a mold;

[0052] Step 2: Place the inner layer 1 and the composite middle layer 2 with the support layer 1 21 and the support layer 2 22 on one side corresponding to each other, make the grooves on the support layer 1 21 and the support layer 2 22 correspond to each other, make the sewing parts of the vertical support member 1 23 and the vertical support member 2 24 corresponding to each other vertically overlap and place the air-permeable rib tube 26 in the middle, sew and fix the vertical support member 1 23 and the vertical support member 2 24 at the vertical overlapping positions above and below the air-permeable rib tube 26 together by sewing lines to form reinforcement layers 25 respectively, and hot-press and fix the protective stop seat parts 27 of the vertical support member 1 23 and the vertical support member 2 24 of two adjacent tear-resistant support structures together, thereby preparing a tear-resistant support structure;

[0053] In step 2 of this embodiment, the pressure of the hot pressing treatment is 4 MPa, the temperature is 110° C., the number of hot pressing times is 3 times, and the hot pressing time for each time is 3 minutes;

[0054] Step 3: hot-press and fix the inner layer 1, the waterproof surface layer 3, and the two adjacent grooves of the support layer 1 21 and the support layer 2 22 together to obtain a waterproof and breathable fabric;

[0055] In step three of this embodiment, the pressure of the hot pressing treatment is 6 MPa, the temperature is 140° C., the number of hot pressing times is 4 times, and the time of each hot pressing is 4 minutes.

[0056] Comparative Example 1

[0057] like Figure 5 As shown, a vacuum nano waterproof breathable fabric is shown. The difference from Example 2 is that in this comparative example, the composite middle layer 2 does not have the structural design of the breathable rib tube 26 and the protective blocking seat 27, and the rest is consistent with Example 2.

[0058] Comparative Example 2

[0059] like Figure 6 As shown, a vacuum nano waterproof breathable fabric is different from Example 2 in that, in this comparative example, the composite middle layer 2 does not have the structural design of the reinforcement layer 25, the breathable rib tube 26, and the protective seat 27, and the rest are consistent with Example 2.

[0060] Comparative Example 3

[0061] like Figure 7 As shown, a vacuum nano waterproof breathable fabric is different from Example 2 in that, in this comparative example, the composite middle layer 2 does not have the structural design of vertical support member 1 23, vertical support member 24, reinforcement layer 25, breathable rib tube 26, and protective blocking seat 27, and the rest are consistent with Example 2.

[0062] 3. Performance Test Experiment

[0063] The following fabric transverse tensile test data and transverse resilience test data are tensile test data. Figure 1 The left and right sides of the fabric shown in the figure are the test data of the longitudinal tensile resistance and longitudinal resilience performance of the fabric. Figure 1 Front and back sides of fabric shown.

[0064] Tensile strength test and resilience test: LLY-06BD electronic fiber strength tester was used for testing, with a tensile speed of 26 mm / min, a pre-tension of 0.10 cN, a clamping distance of 150 mm (elastic recovery rate was tested with a 5% fixed elongation), and the average value was calculated to obtain the tensile strength and resilience test data of the fabric, as shown in Table 1:

[0065] Table 1. Test data of tensile strength and resilience

[0066]

[0067] Experimental results: As shown in the data in Table 1, the fabrics prepared in Examples 1-2 all have good tensile strength and resilience performance. By comparing Example 2 with Comparative Examples 1-3, it can be seen that the structural design of the vertical support member 23 and the vertical support member 24 forms a reinforcement effect between the cavities formed by the grooves of the support layer 1 21 and the support layer 2 22, thereby improving the transverse and longitudinal tensile strength and resilience performance of the fabric. The structural design of the reinforcement layer 25 connects and fixes the sewn parts of the vertical support member 23 and the vertical support member 24 together, which can better In order to further improve the transverse and longitudinal tensile resistance and resilience of the fabric, on this basis, the structural design of the breathable rib tube 26 and the protective seat 27 forms a left and right limiting resistance and a front and back reinforcement effect between the vertical support member 1 23 and the vertical support member 2 24, thereby further improving the transverse and longitudinal tensile resistance and resilience of the fabric. The structural design of the vertical support member 1 23, the vertical support member 2 24, the reinforcement layer 25, the breathable rib tube 26 and the protective seat 27 can significantly improve the transverse and longitudinal tensile resistance and resilience of the fabric at the same time.

[0068] The fabrics used in the following anti-down performance test are the unwashed vacuum nano waterproof breathable fabrics of Examples 1-2 and Comparative Examples 1-3 and the vacuum nano waterproof breathable fabrics washed 30 times (washed 30 times in a drum washing machine with a speed of 1200 r / min, each washing time is 21 minutes).

[0069] Anti-down drilling performance test: According to the national standard GB / T12705.2-2009 "Test method for anti-down leakage of textile fabrics Part 2: Transfer box method", the anti-down drilling performance of the fabric is tested. When the number of down drilling roots of the fabric is greater than 15, the anti-down drilling performance is poor; when the number of down drilling roots is 5<≤15, it has anti-down drilling performance; when the number of down drilling roots is ≤5, it has good anti-down drilling performance. The test data is shown in Table 2:

[0070] Table 2 Anti-drilling performance test data table

[0071]

[0072]

[0073] Experimental results: It can be seen from the data in Table 2 that the fabrics prepared in Examples 1-2 all have good anti-down drilling effects, among which the effect of Example 2 is more significant. The principle is speculated to be that the structural design of the vertical support member 23 and the vertical support member 24 divides the cavity formed between the grooves of the support layer 1 21 and the support layer 2 22 into multiple spaces, which increases the complexity of the space, thereby improving the anti-down drilling property of the fabric. The reinforcement layer 25, the breathable rib tube 26 and the protective blocking seat 27 increase the upper and lower and left and right connection stability between the vertical support member 23 and the vertical support member 24, thereby making the fabric have a better anti-down drilling effect and can still maintain a good anti-down drilling effect after multiple washings.

[0074] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A vacuum nano waterproof breathable fabric, characterized by: It comprises an inner layer (1), a waterproof surface layer (3), and a composite middle layer (2) used for connecting between the inner layer (1) and the waterproof surface layer (3); The composite middle layer (2) comprises a supporting layer 1 (21) and a supporting layer 2 (22) which are arranged opposite to each other and are used to connect to the inner layer (1) and the waterproof surface layer (3) on opposite sides respectively, and grooves are symmetrically provided on the supporting layer 1 (21) and the supporting layer 2 (22), and a cavity is formed between the grooves of the supporting layer 1 (21) and the supporting layer 2 (22), and at least two tear-resistant support structures are provided inside the cavity; The tear-resistant support structure comprises a vertical support member 1 (23) and a vertical support member 2 (24) which are arranged diagonally and are respectively arranged on a support layer 1 (21) and a support layer 2 (22), wherein the vertical support member 1 (23) and the vertical support member 2 (24) both comprise a fixing portion and a sewing portion, wherein the fixing portion is connected to the inner wall of the groove, and the sewing portions of the vertical support member 1 (23) and the vertical support member 2 (24) are vertically overlapped with each other and a hollow air-permeable rib tube (26) is arranged in the middle, and the two sewing portions vertically overlapped with each other above and below the air-permeable rib tube (26) are sewn and fixed together by sewing lines to form a reinforcement layer (25).

2. The vacuum nano waterproof breathable fabric according to claim 1, characterized in that: The vertical support member 1 (23) and the vertical support member 2 (24) further include a protective stop seat portion (27) located on a side of the fixing portion away from the sewing portion, the protective stop seat portion (27) being located on the outer circle of the sewing portion and used to support the air permeable rib tube (26) and the sewing portion wrapped outside the air permeable rib tube (26); The protective blocking seat parts (27) of the vertical supporting member 1 (23) and the vertical supporting member 2 (24) of two adjacent tear-resistant supporting structures are fixed together by hot pressing.

3. The vacuum nano waterproof breathable fabric according to claim 2, characterized in that: The support layer 1 (21), the support layer 2 (22), the vertical support member 1 (23), the vertical support member 2 (24), the air permeable rib tube (26) and the protective blocking seat (27) are all made of polyamide material or polypropylene material.

4. A method for preparing the vacuum nano waterproof breathable fabric according to any one of claims 1 to 3, characterized in that: The specific steps are as follows: Step 1: A support layer 1 (21) and a support layer 2 (22) are extruded on the surfaces of the inner layer (1) and the composite middle layer (2) by means of a mold, wherein the support layer 1 (21) and the support layer 2 (22) both have grooves, and at least two vertical support members 1 (23) and a vertical support member 2 (24) are extruded on the inner walls of the grooves of the support layer 1 (21) and the support layer 2 (22) by means of a mold, wherein the vertical support member 1 (23) and the vertical support member 2 (24) both include a fixing portion and a sewing portion, and are extruded by means of a mold to form a hollow air permeable rib tube (26) inside; Step 2: Place the inner layer (1) and the composite middle layer (2) with one side of the support layer 1 (21) and the support layer 2 (22) corresponding to each other, make the grooves on the support layer 1 (21) and the support layer 2 (22) correspond to each other, make the sewing parts of the corresponding vertical support member 1 (23) and the vertical support member 2 (24) vertically overlap and place the air-permeable rib tube (26) in the middle, and sew and fix the vertical support member 1 (23) and the vertical support member 2 (24) located above and below the air-permeable rib tube (26) together at the vertical overlapping positions by sewing lines to form reinforcement layers (25) respectively, so as to prepare a tear-resistant support structure; Step 3: The inner layer (1), the waterproof surface layer (3), and the two adjacent grooves of the support layer 1 (21) and the support layer 2 (22) are fixed together by hot pressing to obtain a waterproof and breathable fabric.

5. The method for preparing a vacuum nano waterproof breathable fabric according to claim 4, characterized in that: In step 1, the vertical support member 1 (23) and the vertical support member 2 (24) further include a protective stop seat portion (27) connected to a side of the fixing portion away from the sewing portion; In step 2, after sewing to form the reinforcement layer (25), the protective stop seat parts (27) of the vertical support member 1 (23) and the vertical support member 2 (24) of the two adjacent tear-resistant support structures are fixed together by hot pressing, the pressure of the hot pressing treatment is 3-5MPa, the temperature is 105-120°C, the number of hot pressing times is 2-4 times, and the time of each hot pressing is 2-4 minutes.

6. A method for preparing a vacuum nano waterproof breathable fabric according to any one of claims 4-5, characterized in that: In step three, the pressure of the hot pressing treatment is 4-7 MPa, the temperature is 135-145° C., the number of hot pressing times is 3-5 times, and the time of each hot pressing is 2-4 minutes.

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