Warm-keeping and moisture-permeable composite fabric and preparation method thereof

Abstract

The invention belongs to the field of fabrics, and particularly relates to a warm-keeping and moisture-permeable composite fabric and a preparation method thereof. The preparation method provided by the invention comprises the following steps: a) stacking an inner-layer material, a middle-layer material and an outer-layer material, and coating a pore-foaming agent between the middle-layer material and the outer-layer material to obtain a to-be-hot-pressed fabric; in the step a), the material of the inner layer is foamed cotton, the material of the middle layer is a thermoplastic material, and the pore-foaming agent comprises bicarbonate; b) hot-pressing the inner-layer material surface of the to-be-hot-pressed fabric upwards, and cooling and forming to obtain the warm-keeping and moisture-permeable composite fabric, in the step b), the hot pressing temperature is higher than the temperature at which bicarbonate is pyrolyzed to generate carbonate and carbon dioxide. According to the preparation method of the composite fabric, the foamed cotton is adopted to replace gauze, the light and thin fabric serves as an inner-layer heat preservation material, interlayer bonding is achieved without an adhesive, and the prepared composite fabric has good heat preservation and moisture permeability.

Description

Technical Field

[0001] This invention belongs to the field of fabrics, and particularly relates to a thermal and moisture-wicking composite fabric and its preparation method. Background Technology

[0002] When people engage in outdoor activities, they sweat due to the significant energy expenditure, making breathability a fundamental function of outdoor clothing. Furthermore, in lower temperatures, outdoor clothing also needs to provide warmth. However, whether using natural fibers such as cotton, wool, silk, and linen, or chemical fibers such as polyester, acrylic, nylon, polypropylene, and viscose, it is difficult to simultaneously meet all these requirements. Therefore, composite fabrics have emerged as a solution.

[0003] Common thermal and breathable composite fabrics typically have a three-layer structure. The inner layer consists of materials such as mesh or lightweight fabric, serving to secure the middle layer or provide a specific style. The middle layer is a waterproof and breathable membrane, and the outer layer is abrasion-resistant fabric. The three layers are bonded together with adhesives. However, the inner layer of mesh or lightweight fabric does not effectively increase the fabric's thermal insulation performance, and the use of adhesives can clog the fabric's pores, further reducing its breathability. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a thermal insulation and moisture-permeable composite fabric and its preparation method. The composite fabric preparation method provided by the present invention uses foamed cotton instead of mesh and a thin fabric as the inner insulation material, and does not rely on adhesives to achieve interlayer bonding. The prepared composite fabric has good thermal insulation and moisture permeability.

[0005] This invention provides a method for preparing a thermally insulating and moisture-wicking composite fabric, comprising the following steps:

[0006] a) The inner layer material, the middle layer material and the outer layer material are stacked, and a pore-forming agent is applied between the middle layer material and the outer layer material to obtain the fabric to be heat-pressed;

[0007] In step a), the inner layer material is foamed cotton, the middle layer material is thermoplastic material, and the pore-forming agent includes bicarbonate;

[0008] b) The inner layer material of the fabric to be hot-pressed is placed with the inner layer material facing upwards, and then cooled and shaped to obtain a warm and breathable composite fabric.

[0009] In step b), the temperature of the hot pressing is higher than the temperature at which the bicarbonate is pyrolyzed to produce carbonate and carbon dioxide.

[0010] Preferably, in step a), the inner layer material is polyethylene foam; the pore size of the inner layer material is 50~200μm, the porosity is 80~95%, and the thickness is 0.5~2mm.

[0011] Preferably, in step a), the intermediate layer material is thermoplastic polyurethane and / or polyvinyl alcohol; the thickness of the intermediate layer material is 10~30μm.

[0012] Preferably, in step a), the outer layer material is polyester fabric; the weight of the outer layer material is 50~80 g / m². 2 The pore size is 5~30μm.

[0013] Preferably, in step a), the bicarbonate is sodium bicarbonate.

[0014] Preferably, in step a), the amount of bicarbonate used is 10~30 g / m³. 2 .

[0015] Preferably, in step b), the hot pressing temperature is 100~120℃, the pressure is 0.8~1MPa, and the time is 20~60s.

[0016] Preferably, in step b), the fabric to be hot-pressed is first heat-dried after hot pressing, and then cooled and shaped.

[0017] Preferably, in step b), the cooling and forming method is cold roll forming.

[0018] This invention provides a thermal and breathable composite fabric, which is made according to the preparation method described in the above technical solution.

[0019] Compared with existing technologies, this invention provides a thermally insulating and breathable composite fabric and its preparation method. The preparation method provided by this invention includes the following steps: a) stacking an inner layer material, a middle layer material, and an outer layer material, and applying a pore-forming agent between the middle layer material and the outer layer material to obtain a fabric to be heat-pressed; in step a), the inner layer material is foamed cotton, the middle layer material is a thermoplastic material, and the pore-forming agent includes bicarbonate; b) hot-pressing the inner layer material of the fabric to be heat-pressed with the inner layer material facing upwards, and cooling to form a thermally insulating and breathable composite fabric; in step b), the hot-pressing temperature is higher than the temperature at which the bicarbonate pyrolyzes to generate carbonate and carbon dioxide. This invention uses foamed cotton instead of mesh and thin fabric as the inner layer insulation material of the fabric, effectively increasing the air retention rate of the inner layer and improving the warmth retention of the fabric. Based on this, the present invention selects a thermoplastic material as the middle layer of the fabric and combines it with a bicarbonate pore-forming agent and a hot-pressing process. On the one hand, the thermoplastic material in the middle layer melts during the hot-pressing process, achieving a strong bond between the inner and outer layers of the fabric and avoiding the problem of fabric pore blockage caused by the use of adhesives. On the other hand, the bicarbonate pore-forming agent decomposes under heat during the hot-pressing process, and the generated carbon dioxide penetrates upward from the back of the middle layer to the surface of the inner layer. The rising carbon dioxide gas not only forms good moisture-permeable channels in the thermoplastic material during its penetration of the middle layer, but also has a certain unblocking effect on the channels of the inner layer of the fabric as it continues to rise through the inner layer, ensuring the fluffiness of the inner layer material. The composite fabric preparation method provided by the present invention does not require adhesive coating, the process is simple, the production efficiency is high, and the prepared composite fabric is relatively thin, possessing both excellent warmth retention and moisture permeability. Detailed Implementation

[0020] 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.

[0021] This invention provides a method for preparing a thermally insulating and moisture-wicking composite fabric, comprising the following steps:

[0022] a) The inner layer material, the middle layer material and the outer layer material are stacked, and a pore-forming agent is applied between the middle layer material and the outer layer material to obtain the fabric to be heat-pressed;

[0023] In step a), the inner layer material is foamed cotton, the middle layer material is thermoplastic material, and the pore-forming agent includes bicarbonate;

[0024] b) The inner layer material of the fabric to be hot-pressed is placed with the inner layer material facing upwards, and then cooled and shaped to obtain a warm and breathable composite fabric.

[0025] In step b), the temperature of the hot pressing is higher than the temperature at which the bicarbonate is pyrolyzed to produce carbonate and carbon dioxide.

[0026] In the preparation method provided by this invention, in step a), the inner layer material is preferably polyethylene foam; the pore size of the inner layer material is preferably 50~200μm, specifically 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm or 200μm; the porosity of the inner layer material is preferably 80~95%, specifically 80 The thickness of the inner layer material is preferably 0.5~2mm, specifically 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0027] In the preparation method provided by the present invention, in step a), the intermediate layer material is preferably thermoplastic polyurethane and / or polyvinyl alcohol; the melting temperature of the intermediate layer material is preferably 90~120℃; the thickness of the intermediate layer material is preferably 10~30μm, specifically 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm or 30μm.

[0028] In the preparation method provided by this invention, in step a), the outer layer material is preferably polyester fabric; the basis weight of the outer layer material is preferably 50~80 g / m². 2 Specifically, it can be 50g / m 2 51g / m 2 52g / m 2 53g / m 2 54g / m 2 55g / m 2 56g / m 2 57g / m 2 58g / m 2 59g / m 2 60g / m 2 61g / m 2 62g / m 263g / m 2 64g / m 2 65g / m 2 66g / m 2 67g / m 2 68g / m 2 69g / m 2 70g / m 2 71g / m 2 72g / m 2 73g / m 2 74g / m 2 75g / m 2 76g / m 2 77g / m 2 78g / m 2 79g / m 2 Or 80g / m 2 The pore size of the outer layer material is preferably 5~30μm, specifically 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm or 30μm; the thickness of the outer layer material is preferably 0.5~2mm, specifically 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm or 2mm.

[0029] In the preparation method provided by this invention, in step a), the bicarbonate is preferably sodium bicarbonate; the amount of bicarbonate used is preferably 10~30 g / m³. 2 Specifically, it can be 10g / m 2 11g / m 2 12g / m 2 13g / m 2 14g / m 2 15g / m 2 16g / m 2 17g / m 2 18g / m 2 19g / m 2 20g / m 2 21g / m 2 22g / m 2 23g / m 2 24g / m 2 25g / m2 26g / m 2 27g / m 2 28g / m 2 29g / m 2 Or 30g / m 2 .

[0030] In the preparation method provided by this invention, the hot pressing temperature is preferably 100~120℃, specifically 100℃, 101℃, 102℃, 103℃, 104℃, 105℃, 106℃, 107℃, 108℃, 109℃, 110℃, 111℃, 112℃, 113℃, 114℃, 115℃, 116℃, 117℃, 118℃, 119℃, or 120℃; the hot pressing pressure is preferably 0.8~1MPa, specifically 0.8MPa, 0.81MPa, 0.82MPa, 0.83MPa, 0.84MPa, or 0.85MPa. The pressure is 0.86 MPa, 0.87 MPa, 0.88 MPa, 0.89 MPa, 0.9 MPa, 0.91 MPa, 0.92 MPa, 0.93 MPa, 0.94 MPa, 0.95 MPa, 0.96 MPa, 0.97 MPa, 0.98 MPa, 0.99 MPa, or 1 MPa; the hot pressing time is preferably 20~60 s, specifically 20 s, 23 s, 25 s, 27 s, 30 s, 32 s, 35 s, 37 s, 40 s, 42 s, 45 s, 47 s, 50 s, 52 s, 55 s, 57 s, or 60 s.

[0031] In the preparation method provided by this invention, in step b), in order to further pyrolyze the pore-forming agent to create pores, the fabric to be hot-pressed is preferably first heat-dried after hot pressing, and then cooled and shaped. The heat-drying temperature is preferably 60~100℃, specifically 60℃, 62℃, 65℃, 67℃, 70℃, 72℃, 75℃, 77℃, 80℃, 82℃, 85℃, 87℃, 90℃, 92℃, 95℃, 97℃, or 100℃; the heat-drying time is preferably 5~20min, specifically 5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min, or 20min.

[0032] In the preparation method provided by the present invention, in step b), the cooling and forming method is preferably cold roll forming; the cooling and forming temperature is preferably 5~15℃, specifically 5℃, 6℃, 7℃, 8℃, 9℃, 10℃, 11℃, 12℃, 13℃, 14℃ or 15℃.

[0033] The present invention also provides a thermal and moisture-wicking composite fabric, which is made according to the preparation method described in the above technical solution, and includes an inner layer, a middle layer and an outer layer stacked together.

[0034] In the thermal and breathable composite fabric provided by the present invention, the intermediate layer penetrates into the fiber gaps of the outer layer and the foam pore walls of the inner layer through hot pressing to form mechanical anchoring; and the intermediate layer forms a porous structure during the hot pressing process, with the pore size preferably ranging from 0.3 to 1 μm, more preferably from 0.4 to 0.6 μm.

[0035] In the thermal insulation and moisture-wicking composite fabric provided by the present invention, the total thickness of the composite fabric is preferably 1.5~3mm, specifically 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm.

[0036] For clarity, the following examples and comparative models will be used to provide a detailed description.

[0037] Example 1

[0038] A method for preparing a thermally insulating and breathable composite fabric includes the following steps:

[0039] S1: The inner layer material (polyethylene foam, pore size 100μm, porosity 90%, thickness 1mm) and the middle layer material (thermoplastic polyurethane, melting temperature 90~120℃, thickness 20μm) are stacked together.

[0040] S2: Apply a sodium bicarbonate aqueous solution (5wt%) evenly to the surface of the intermediate layer material, with a sodium bicarbonate application rate of 15g / m². 2 ;

[0041] S3: The outer layer material (polyester fabric, weight 65g / m²) 2 A layer of material with a pore size of 15μm and a thickness of 1.2mm is coated onto the surface of an intermediate layer material that has been sprayed with sodium bicarbonate to obtain the fabric to be heat-pressed.

[0042] S4: The inner layer of the fabric to be hot-pressed is placed with the inner layer facing upwards and hot-pressed; wherein the hot-pressing temperature is 115℃, the pressure is 0.8MPa, and the time is 30s;

[0043] S5: The fabric that has been hot-pressed is then heat-dried to further decompose the pores; the heat-drying temperature is 80℃ and the time is 10min.

[0044] S6: The fabric that has been heated is then subjected to cold roll forming at 10℃ to obtain a warm and breathable composite fabric.

[0045] The thermal and breathable composite fabric prepared in this embodiment includes an inner layer, a middle layer, and an outer layer stacked together. The middle layer penetrates into the fiber gaps of the outer layer and the foam pore walls of the inner layer through hot pressing, forming a mechanical anchor. Furthermore, the middle layer forms a porous structure with a pore size of approximately 0.5 μm during the hot pressing process, exhibiting excellent waterproof and breathable properties.

[0046] The performance indicators of the thermal insulation and moisture-permeable composite fabric prepared in this embodiment were tested, and the results were as follows: total fabric thickness 2.2 mm (test standard: GB / T 3820), moisture permeability 8000 g / m². 2 • 24h (Test standard: GB / T 12704.1), thermal resistance 0.35m 2 ·℃ / W (Test standard: GB / T 11048), peel strength 10.8N / cm (Test standard: GB / T 2791).

[0047] Comparative Example 1

[0048] Comparative Example 1 is a traditional adhesive-bonded fabric, and its preparation process is as follows:

[0049] S1: Apply polyurethane adhesive (coating amount 20g / m²) evenly to the surface of the inner layer material (polyethylene foam, pore size 100μm, porosity 90%, thickness 1mm). 2 );

[0050] S2: Attach the intermediate layer material (polyurethane waterproof and breathable membrane, 20μm thick) to the inner layer adhesive surface;

[0051] S3: The outer layer material (polyester fabric, weight 65g / m²) 2 The surface of the material (with a pore size of 15μm and a thickness of 1.2mm) is uniformly coated with polyurethane adhesive (coating amount of 20g / m²). 2 Then attach it to the middle layer;

[0052] S4: The three-layer composite fabric is hot-pressed and cured on a hot press at a temperature of 100℃, a pressure of 0.5MPa, and a time of 60s.

[0053] S5: Cooling and shaping to obtain a traditional adhesive-bonded, warm and breathable composite fabric.

[0054] The performance indicators of the thermal insulation and moisture-permeable composite fabric prepared in this comparative example were tested, and the results were as follows: total fabric thickness 2.8 mm (test standard: GB / T 3820), moisture permeability 6000 g / m². 2 • 24h (Test standard: GB / T 12704.1), thermal resistance 0.20m 2 ·℃ / W (Test standard: GB / T 11048), peel strength 6.5N / cm (Test standard: GB / T 2791).

[0055] Example 2

[0056] A method for preparing a thermally insulating and breathable composite fabric includes the following steps:

[0057] S1: The inner layer material (polyethylene foam, pore size 150μm, porosity 85%, thickness 1.5mm) and the middle layer material (polyvinyl alcohol, melting temperature 90~120℃, thickness 15μm) are stacked together;

[0058] S2: Apply a sodium bicarbonate aqueous solution (5wt% concentration) evenly to the surface of the intermediate layer material, with a sodium bicarbonate application rate of 20g / m². 2 ;

[0059] S3: The outer layer material (polyester fabric, weight 70g / m²) 2 A layer of material with a pore size of 10 μm and a thickness of 1.2 mm is coated onto the surface of an intermediate layer material that has been sprayed with sodium bicarbonate to obtain the fabric to be heat-pressed.

[0060] S4: The inner layer of the fabric to be hot-pressed is placed with the inner layer facing upwards and hot-pressed; wherein the hot-pressing temperature is 110℃, the pressure is 0.9MPa, and the time is 40s;

[0061] S5: The fabric that has been hot-pressed is then heat-dried to further decompose the pores; the heat-drying temperature is 90℃ and the time is 15min.

[0062] S6: The fabric that has been heated is then subjected to cold roll forming at 5°C to obtain a warm and breathable composite fabric.

[0063] The thermal and breathable composite fabric prepared in this embodiment includes an inner layer, a middle layer and an outer layer stacked together. The middle layer penetrates into the fiber gaps of the outer layer and the foam pore walls of the inner layer through hot pressing to form mechanical anchoring. The middle layer forms a porous structure with a pore size of about 0.4 μm during the hot pressing process.

[0064] The performance indicators of the thermal insulation and moisture-permeable composite fabric prepared in this embodiment were tested, and the results were as follows: total fabric thickness 2.5 mm (test standard: GB / T 3820), moisture permeability 7500 g / m². 2 • 24h (Test standard: GB / T 12704.1), thermal resistance 0.30m 2 ·℃ / W (Test standard: GB / T 11048), peel strength 11.0 N / cm (Test standard: GB / T 2791).

[0065] Example 3

[0066] A method for preparing a thermally insulating and breathable composite fabric includes the following steps:

[0067] S1: The inner layer material (polyethylene foam, pore size 80μm, porosity 92%, thickness 0.8mm) and the middle layer material (thermoplastic polyurethane, melting temperature 90~120℃, thickness 25μm) are stacked together;

[0068] S2: Apply a sodium bicarbonate aqueous solution (5wt% concentration) evenly to the surface of the intermediate layer material, with a sodium bicarbonate application rate of 25g / m². 2 ;

[0069] S3: The outer layer material (polyester fabric, weight 60g / m²) 2 A layer of material with a pore size of 20 μm and a thickness of 0.9 mm is coated onto the surface of an intermediate layer material that has been sprayed with sodium bicarbonate to obtain the fabric to be heat-pressed.

[0070] S4: The inner layer of the fabric to be hot-pressed is placed with the inner layer facing upwards and hot-pressed; wherein the hot-pressing temperature is 105℃, the pressure is 1.0MPa, and the time is 50s;

[0071] S5: The fabric that has been hot-pressed is then heat-dried to further decompose the pores; the heat-drying temperature is 70℃ and the time is 12min.

[0072] S6: The fabric that has been heated is then cold-rolled at 12°C to obtain a warm and breathable composite fabric.

[0073] The thermal and breathable composite fabric prepared in this embodiment includes an inner layer, a middle layer and an outer layer stacked together. The middle layer penetrates into the fiber gaps of the outer layer and the foam pore walls of the inner layer through hot pressing to form mechanical anchoring. The middle layer forms a porous structure with a pore size of about 0.6 μm during the hot pressing process.

[0074] The performance indicators of the thermal insulation and moisture-permeable composite fabric prepared in this embodiment were tested, and the results were as follows: total fabric thickness 2.0 mm (test standard: GB / T 3820), moisture permeability 8200 g / m². 2 • 24h (Test standard: GB / T 12704.1), thermal resistance 0.25m 2 ·℃ / W (Test standard: GB / T 11048), peel strength 10.5N / cm (Test standard: GB / T 2791).

[0075] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for producing a warm and moisture permeable composite fabric, characterized by, The method comprises the following steps: a) stacking the inner layer material, the intermediate layer material and the outer layer material, and applying a pore-forming agent between the intermediate layer material and the outer layer material to obtain a material to be hot-pressed; In step a), the inner layer material is foamed cotton, the intermediate layer material is thermoplastic material, and the pore-forming agent comprises a bicarbonate salt; b) hot-pressing the inner layer material of the material to be hot-pressed with the inner layer material facing upwards, and cooling to form a warm and moisture-permeable composite material; In step b), the temperature of the hot-pressing is higher than the temperature at which the bicarbonate salt is pyrolyzed to generate a carbonate salt and carbon dioxide.

2. The production method according to claim 1, characterized by, In step a), the inner layer material is polyethylene foamed cotton; the pore size of the inner layer material is 50-200 μm, the porosity is 80-95%, and the thickness is 0.5-2 mm.

3. The preparation method according to claim 1, characterized in that, In step a), the intermediate layer material is thermoplastic polyurethane and / or polyvinyl alcohol; the thickness of the intermediate layer material is 10-30 μm.

4. The method of claim 1, wherein, In step a), the outer layer material is polyester fabric; the gram weight of the outer layer material is 50~80g / m 2 , and the pore size is 5~30μm.

5. The preparation method according to claim 1, characterized in that, In step a), the bicarbonate salt is sodium bicarbonate.

6. The method of claim 1, wherein, In step a), the amount of the bicarbonate salt is 10 to 30 g / m 2 .

7. The preparation method according to claim 1, characterized in that, In step b), the temperature of the hot-pressing is 100-120 °C, the pressure is 0.8-1 MPa, and the time is 20-60 s.

8. The method of claim 1, wherein, In step b), after the hot-pressing is completed, the material to be hot-pressed is first subjected to hot drying, and then is subjected to cooling and setting.

9. The method of claim 1, wherein, In step b), the cooling and setting is performed by cold roll calendering.

10. A thermal, moisture permeable composite fabric, characterized by The warm and moisture-permeable composite material is prepared by the method according to any one of claims 1-9.