A vacuum nano-waterproof and breathable fabric and its preparation method

Abstract

This invention relates to a vacuum nano-waterproof and breathable fabric and its preparation method. The fabric includes an inner layer, a waterproof outer layer, and a composite middle layer for connecting the inner layer and the waterproof outer layer. The composite middle layer includes a support layer one and a support layer two, which are arranged opposite each other and are respectively connected to the opposite sides of the inner layer and the waterproof outer layer. Grooves are symmetrically formed on the support layer one and support layer two, and a cavity is formed between the grooves of the support layer one and support layer two. At least two tear-resistant support structures are provided inside the cavity. This invention, through its structural design of forming a vertical support member one, a vertical support member two, a reinforcing layer, breathable ribs, and a protective baffle between the support layer one and support layer two, can significantly improve the transverse and longitudinal tensile strength and resilience of the fabric, making the fabric less prone to deformation, durable, and also improving its down-proof effect.

Description

Technical Field

[0001] This invention belongs to the field of clothing fabric technology, specifically relating to a vacuum nano-waterproof and breathable fabric and its preparation method. Background Technology

[0002] Down jackets, as essential winter clothing for warmth, generally require fabrics with good waterproof and breathable properties to adapt to different weather conditions, such as rain and snow. Existing technologies utilize vacuum nano-coating to form a continuous and uniform nano-waterproof coating on the fabric surface. In addition, down jacket fabrics need to accommodate various stretching movements during human activity, thus requiring good tensile strength and resilience to ensure they are not easily torn or deformed during wear, minimizing down leakage. However, existing technologies have limited research on improving the fabric's structure to enhance its tensile strength and resilience. Therefore, we provide a vacuum nano-waterproof and breathable fabric and its preparation method to address the aforementioned technical problems. Summary of the Invention

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

[0004] The present invention achieves the above objectives through the following technical solutions:

[0005] A vacuum nano waterproof and breathable fabric includes an inner layer, a waterproof outer layer, and a composite middle layer for connecting the inner layer and the waterproof outer layer.

[0006] The composite middle layer includes a support layer one and a support layer two arranged opposite to each other and used to connect to the opposite side of the inner layer and the waterproof top layer, respectively. Grooves are symmetrically formed on the support layer one and the support layer two, and a cavity is formed between the grooves of the support layer one and the support layer two. At least two tear-resistant support structures are provided inside the cavity.

[0007] The tear-resistant support structure includes two vertical support members arranged diagonally on support layer one and support layer two, respectively. Each vertical support member includes a fixing part and a sewing part. The fixing part is connected to the inner wall of the groove. The sewing parts of the vertical support member and the vertical support member are vertically overlapped and have a hollow air rib in the middle. The two sewing parts that are vertically overlapped above and below the air rib are sewn together by a sewing thread to form a reinforcement layer.

[0008] As a further optimization of the present invention, the first vertical support and the second vertical support also include a protective stop portion located on the side of the fixing part away from the sewing part. The protective stop portion is located on the outer ring of the sewing part and is used to support the breathable rib tube and the sewing part wrapped around the outside of the breathable rib tube.

[0009] The protective seat parts of two adjacent tear-resistant support structures, vertical support component one and vertical support component two, are hot-pressed together.

[0010] As a further optimization of the present invention, the first support layer, the second support layer, the first vertical support member, the second vertical support member, the breathable rib tube, and the protective baffle are all made of polyamide or polypropylene material.

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

[0012] Step 1: Support layer 1 and support layer 2 are integrally extruded on the inner layer and composite middle layer surfaces through a mold. Both support layer 1 and support layer 2 have grooves. At least two vertical support components 1 and 2 are integrally extruded on the inner walls of the grooves of support layer 1 and support layer 2 through a mold. Both vertical support components 1 and 2 include a fixing part and a sewing part, and are extruded with hollow, breathable ribs through a mold.

[0013] Step 2: Place the inner layer and the composite middle layer with support layer 1 and support layer 2 facing each other, so that the grooves on support layer 1 and support layer 2 are aligned with each other, and vertically overlap the sewn parts of the vertical support component 1 and vertical support component 2, and place the breathable rib tube in the middle. Sewing the vertically overlapping positions of vertical support component 1 and vertical support component 2 above and below the breathable rib tube together with sewing thread to form a reinforcement layer, thereby preparing a tear-resistant support structure.

[0014] Step 3: Heat-press the inner layer, waterproof outer layer, and the adjacent grooves of support layer one and support layer two together to obtain the waterproof and breathable fabric.

[0015] As a further optimization of the present invention, in step one, the first vertical support member and the second vertical support member further include a protective stop portion connected to the side of the fixing portion away from the sewing portion.

[0016] In step two, after the reinforcing layer is sewn together, the protective seat parts of the two adjacent tear-resistant support structures, vertical support component one and vertical support component two, are hot-pressed together. The pressure of the hot-pressing treatment is 3-5 MPa, the temperature is 105-120℃, the number of hot-pressing times is 2-4, and the hot-pressing time for each time is 2-4 minutes.

[0017] As a further optimization of the present invention, in step three, the pressure of the hot pressing treatment is 4-7 MPa, the temperature is 135-145℃, the number of hot pressing cycles is 3-5, and the hot pressing time for each cycle is 2-4 min.

[0018] The beneficial effects of this invention are as follows:

[0019] 1) The present invention, through the structural design of forming a vertical support component 1, a vertical support component 2, a reinforcing layer, a breathable rib tube, and a protective baffle between support layer 1 and support layer 2, can simultaneously and significantly improve the transverse and longitudinal tensile strength and resilience of the fabric, making the fabric less prone to deformation and more durable, while also improving the fabric's down-proof effect.

[0020] 2) The present invention forms a reinforcing effect between the cavity 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, thereby increasing the structural stability. The structural design of the breathable rib tube and the protective seat part forms a lateral limiting and blocking effect and a front and back reinforcing effect between the vertical support member 1 and the vertical support member 2, thereby significantly improving the transverse and longitudinal tensile strength and resilience of the fabric.

[0021] 3) The present invention divides the cavity formed between the grooves of support layer one and support layer two into multiple spaces through the structural design of vertical support component one and vertical support component two, which increases the complexity of the space. The reinforcing layer, breathable rib tube and protective seat part increase the vertical and horizontal connection stability between vertical support component one and vertical support component two, thereby making the fabric have a better anti-down leakage effect and can still maintain a good anti-down leakage effect after multiple washes. Attached Figure Description

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

[0023] Figure 2 This is a cross-sectional schematic diagram of the composite middle layer in Embodiment 1 of the present invention.

[0024] Figure 3 This is a cross-sectional schematic diagram of the composite middle layer in Embodiment 2 of the present invention.

[0025] Figure 4 This is a cross-sectional schematic diagram of the tear-resistant support structure of the present invention.

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

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

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

[0029] In the diagram: 1. Inner layer; 2. Composite middle layer; 21. Support layer one; 22. Support layer two; 23. Vertical support component one; 24. Vertical support component two; 25. Reinforcing layer; 26. Breathable rib tube; 27. Protective baffle; 3. Waterproof surface layer. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0031] I. Materials

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

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

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

[0035] II. Methods

[0036] To investigate the effects of different structural designs of the composite middle layer 2 on the tensile strength, resilience, and down-proof properties of the vacuum nano-waterproof and breathable fabric, the following technical solutions were designed in Examples 1-2 and Comparative Examples 1-3, as detailed below:

[0037] Example 1

[0038] like Figure 1-2 As shown, a vacuum nano waterproof and breathable fabric includes an inner layer 1, a waterproof outer layer 3, and a composite middle layer 2 for connecting the inner layer 1 and the waterproof outer layer 3. The composite middle layer 2 includes a support layer 1 21 and a support layer 22 arranged opposite to each other and for connecting to the opposite sides of the inner layer 1 and the waterproof outer layer 3, respectively. Grooves are symmetrically formed on the support layer 1 21 and the support layer 22, and a cavity is formed between the grooves of the support layer 1 21 and the support layer 22. At least two tear-resistant support structures are provided inside the cavity.

[0039] The tear-resistant support structure includes vertical support member 1 23 and vertical support member 24 arranged diagonally on support layer 1 21 and support layer 22 respectively. Both vertical support member 1 23 and vertical support member 24 include a fixing part and a sewing part. The fixing part is connected to the inner wall of the groove. The sewing parts of vertical support member 1 23 and vertical support member 24 are vertically overlapped and have a hollow air rib tube 26 in the middle. The two sewing parts that are vertically overlapped above and below the air rib tube 26 are sewn together by a sewing thread to form a reinforcing layer 25.

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

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

[0042] Step 1: Support layer 1 21 and support layer 22 are integrally extruded on the surfaces of inner layer 1 and composite middle layer 2 respectively by a mold. Both support layer 1 21 and support layer 22 have grooves. At least two vertical support members 1 23 and vertical support members 24 are integrally extruded on the inner walls of the grooves of support layer 1 21 and support layer 22 respectively by a mold. Both vertical support members 1 23 and vertical support members 24 include a fixing part and a sewing part, and are extruded with hollow breathable rib tubes 26 by a mold.

[0043] Step 2: Place the inner layer 1 and the composite middle layer 2 with the support layer 1 21 and support layer 22 facing each other, so that the grooves on support layer 1 21 and support layer 22 face each other, and vertically overlap the sewn parts of the vertical support member 1 23 and vertical support member 24, and place the breathable rib tube 26 in the middle. Sewing the vertical support member 1 23 and vertical support member 24 above and below the breathable rib tube 26 together with sewing thread to form a reinforcing layer 25, thereby preparing a tear-resistant support structure.

[0044] Step 3: Heat press the inner layer 1, the waterproof outer layer 3, and the adjacent grooves of support layer 1 21 and support layer 2 22 together to obtain the waterproof and breathable fabric.

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

[0046] Example 2

[0047] like Figure 1 , 3As shown in Figure 4, a vacuum nano waterproof and breathable fabric, based on Example 1, in this example, the vertical support member 1 23 and the vertical support member 24 further include a protective stop 27 located on the side of the fixing part away from the sewing part. The protective stop 27 is located on the outer ring of the sewing part and is used to support the breathable rib tube 26 and the sewing part wrapped around the breathable rib tube 26.

[0048] The protective stop portions 27 of the two adjacent tear-resistant support structures, vertical support member 1 23 and vertical support member 24, are hot-pressed together.

[0049] In this embodiment, the support layer 1 21, support layer 22, vertical support 1 23, vertical support 24, breathable rib tube 26, and protective baffle 27 are all made of polyamide or polypropylene.

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

[0051] Step 1: Support layer 1 21 and support layer 22 are integrally extruded on the surfaces of inner layer 1 and composite middle layer 2 respectively by a mold. Both support layer 1 21 and support layer 22 have grooves. At least two vertical support members 1 23 and vertical support members 24 are integrally extruded on the inner walls of the grooves of support layer 1 21 and support layer 22 respectively by a mold. Both vertical support members 1 23 and vertical support members 24 include a fixing part, a sewing part, and a protective stop part 27 connected to the side of the fixing part away from the sewing part. Hollow air-permeable rib tubes 26 are extruded by a mold.

[0052] Step 2: Place the inner layer 1 and the composite middle layer 2 with the support layer 1 21 and support layer 22 facing each other, so that the grooves on support layer 1 21 and support layer 22 are aligned with each other. Place the sewn parts of the vertical support member 1 23 and vertical support member 24 vertically overlap and place the breathable rib tube 26 in the middle. Sewn the vertically overlapping positions of vertical support member 1 23 and vertical support member 24 above and below the breathable rib tube 26 together with sewing thread to form reinforcement layers 25 respectively. Heat-press the protective baffle parts 27 of the two adjacent tear-resistant support structures, vertical support member 1 23 and vertical support member 24, together to prepare a tear-resistant support structure.

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

[0054] Step 3: Heat press the inner layer 1, the waterproof outer layer 3, and the adjacent grooves of support layer 1 21 and support layer 2 22 together to obtain the waterproof and breathable fabric.

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

[0056] Comparative Example 1

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

[0058] Comparative Example 2

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

[0060] Comparative Example 3

[0061] like Figure 7 As shown, a vacuum nano waterproof and breathable fabric differs from Example 2 in that the composite middle layer 2 in this comparative example 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 baffle 27. The rest are consistent with Example 2.

[0062] III. Performance Testing Experiment

[0063] The following data on the transverse tensile strength and transverse resilience of the fabric are based on tensile strength. Figure 1 The data for the longitudinal tensile strength test and longitudinal resilience test of the fabric shown are as follows: (The text abruptly ends here, so the translation stops as well.) Figure 1 The front and back sides of the fabric shown.

[0064] Tensile strength and resilience tests: The LLY-06BD electronic fiber strength tester was used. The tensile speed was 26 mm / min, the pre-tension was 0.10 cN, and the clamping distance was 150 mm (elastic recovery rate was determined using a 5% constant elongation test). The average values ​​were calculated to obtain the tensile strength and resilience test data of the fabric, as shown in Table 1.

[0065] Table 1. Test data for tensile properties and resilience.

[0066]

[0067] Experimental Results: As shown in Table 1, the fabrics prepared in Examples 1-2 all exhibit good tensile strength and resilience. Comparing Example 2 with Comparative Examples 1-3 reveals that the structural design of the vertical support member 1 23 and the vertical support member 24 creates a reinforcing effect between the cavities formed by the grooves in support layer 1 21 and support layer 2 22, thereby improving the transverse and longitudinal tensile strength and resilience of the fabric. Furthermore, the structural design of the reinforcing layer 25 connects and fixes the sewn parts of the vertical support member 1 23 and the vertical support member 24 together, further enhancing... To further improve the transverse and longitudinal tensile strength and resilience of the fabric, the structural design of the breathable rib tube 26 and the protective stop 27 creates a lateral limiting and blocking effect and a front and back strengthening effect between the vertical support member 1 23 and the vertical support member 24, thereby further improving the transverse and longitudinal tensile strength and resilience of the fabric. The structural design of the vertical support member 1 23, the vertical support member 24, the reinforcing layer 25, the breathable rib tube 26, and the protective stop 27 can simultaneously and significantly improve the transverse and longitudinal tensile strength and resilience of the fabric.

[0068] The fabrics used in the following down-proof performance tests were the unwashed vacuum nano waterproof and breathable fabrics of Examples 1-2 and Comparative Examples 1-3, and the vacuum nano waterproof and breathable fabrics that were washed 30 times (30 washes in a drum washing machine at a speed of 1200 r / min, with each wash lasting 21 min).

[0069] Down-proof performance test: The down-proof performance of the fabric was tested according to the national standard GB / T12705.2-2009 "Textiles - Test Method for Down-proof Performance of Fabrics - Part 2: Rotating Box Method". When the number of down threads is >15, the down-proof performance is poor; when 5 < down thread count ≤15, it has down-proof performance; when the number of down threads is ≤5, it has good down-proof performance. The test data are shown in Table 2.

[0070] Table 2. Test data on down-proof performance.

[0071]

[0072]

[0073] Experimental Results: As shown in Table 2, the fabrics prepared in Examples 1-2 all have good down-proof effects. Among them, the effect of Example 2 is more significant. The underlying principle is that the structural design of the vertical support member 1 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, increasing the complexity of the space and thus improving the down-proof properties of the fabric. The reinforcing layer 25, the breathable rib tube 26, and the protective baffle 27 increase the vertical and horizontal connection stability between the vertical support member 1 23 and the vertical support member 24, resulting in a good down-proof effect of the fabric, which can still maintain a good down-proof effect after multiple washes.

[0074] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A vacuum nano-waterproof and breathable fabric, characterized in that: It includes an inner layer (1) and a waterproof top layer (3) and a composite middle layer (2) for connecting the inner layer (1) and the waterproof top layer (3); The composite middle layer (2) includes a support layer one (21) and a support layer two (22) arranged opposite to each other and used to connect to the opposite side of the inner layer (1) and the waterproof top layer (3), respectively. Grooves are symmetrically provided on the support layer one (21) and the support layer two (22), and a cavity is formed between the grooves of the support layer one (21) and the support layer two (22). At least two tear-resistant support structures are provided inside the cavity. The tear-resistant support structure includes a vertical support member 1 (23) and a vertical support member 2 (24) arranged diagonally on support layer 1 (21) and support layer 2 (22) respectively. Both vertical support member 1 (23) and vertical support member 2 (24) include a fixing part and a sewing part. The fixing part is connected to the inner wall of the groove. The sewing parts of vertical support member 1 (23) and vertical support member 2 (24) are vertically overlapped and have a hollow air rib tube (26) in the middle. The two sewing parts of the air rib tube (26) are sewn together by sewing thread to form a reinforcing layer (25).

2. The vacuum nano-waterproof and breathable fabric according to claim 1, characterized in that: The first vertical support member (23) and the second vertical support member (24) also include a protective stop (27) located on the side of the fixing part away from the sewing part. The protective stop (27) is located on the outer ring of the sewing part and is used to support the breathable rib tube (26) and the sewing part wrapped around the outside of the breathable rib tube (26). The protective stop portion (27) of the two adjacent tear-resistant support structures, vertical support member one (23) and vertical support member two (24), is hot-pressed together.

3. The vacuum nano-waterproof and breathable fabric according to claim 2, characterized in that: The support layer one (21), support layer two (22), vertical support component one (23), vertical support component two (24), breathable rib tube (26) and protective baffle part (27) are all made of polyamide material or polypropylene material.

4. A method for preparing a vacuum nano-waterproof and breathable fabric as described in any one of claims 1-3, characterized in that: The specific steps are as follows: Step 1: Support layer 1 (21) and support layer 2 (22) are integrally extruded on the surfaces of inner layer (1) and composite middle layer (2) respectively by a mold. Support layer 1 (21) and support layer 2 (22) both have grooves. At least two vertical support components 1 (23) and vertical support components 2 (24) are integrally extruded on the inner walls of the grooves of support layer 1 (21) and support layer 2 (22) respectively by a mold. Vertical support component 1 (23) and vertical support component 2 (24) both include a fixing part and a sewing part, and are extruded with a hollow air-permeable rib tube (26) by a mold. Step 2: Place the inner layer (1) and the composite middle layer (2) with the support layer 1 (21) and support layer 2 (22) facing each other, so that the grooves on support layer 1 (21) and support layer 2 (22) are aligned with each other, and make the sewn parts of the vertical support member 1 (23) and vertical support member 2 (24) vertically overlap and place the breathable rib tube (26) in the middle. Use sewing thread to sew and fix the vertical support member 1 (23) and vertical support member 2 (24) at the vertical overlap positions above and below the breathable rib tube (26) to form a reinforcing layer (25) respectively, thus preparing a tear-resistant support structure; Step 3: Heat press the inner layer (1), waterproof outer layer (3), support layer one (21) and support layer two (22) together to obtain waterproof and breathable fabric.

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

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

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