A toughened and elastic warm-keeping and antibacterial air layer fabric and a preparation method thereof

Abstract

The application relates to the technical field of air layer fabric, in particular to a toughened and elastic warm-keeping and antibacterial air layer fabric and a preparation method thereof. The fabric comprises an inner layer and an outer layer. The inner layer comprises the following components in proportion by weight: 30-40 parts of composite fibers and 40-60 parts of polyethylene fibers. The outer layer comprises the following components in proportion by weight: 20-30 parts of composite fibers and 60-70 parts of polyamide fibers. The air layer fabric of the application is provided with composite fibers in the inner layer and the outer layer, the elasticity and toughness of the air layer fabric are improved through the composite fibers, the service life of the air layer fabric can be effectively prolonged, and the warm-keeping performance of the air layer fabric is excellent.

Description

A toughened, elastic, warm, and antibacterial air-layer fabric and its preparation method Technical Field

[0001] This invention relates to the field of air layer fabric technology, specifically to a toughened, elastic, warm, and antibacterial air layer fabric and its preparation method. Background Technology

[0002] With social development, technological advancements, and changing consumer attitudes, the demand for clothing fabrics has expanded beyond simple practical functions such as covering the body, durability, and warmth. Higher demands are now being placed on fashion, aesthetics, and comfort. Among these, air-layer fabrics, known for their excellent thermal insulation and comfortable wear, have garnered significant attention. Air-layer fabrics, due to their internal air layers and the slow heat transfer between air molecules, provide superior thermal insulation properties.

[0003] Air-layer fabrics are primarily used in the production of outdoor sportswear, mountaineering apparel, and similar garments. These garments need to move with the body without being overly stiff or fragile, thus requiring a certain degree of elasticity to ensure a better fit and improve comfort and freedom of movement. Currently, existing air-layer fabrics are often made of polyester or nylon to guarantee strength. However, pure polyester or nylon has poor elasticity, and blending elastic materials with polyester or nylon presents compatibility issues, resulting in less than ideal elasticity in air-layer fabrics. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a toughened and elastic warm and antibacterial air-layer fabric and its preparation method.

[0005] The technical solution of the present invention is: a toughened and elastic warm antibacterial air layer fabric, the fabric comprising an inner layer and an outer layer, wherein the inner layer comprises, by weight, the following components: 30-40 parts of composite fiber and 40-60 parts of polyethylene fiber; and the outer layer comprises, by weight, the following components: 20-30 parts of composite fiber and 60-70 parts of polyamide fiber.

[0006] Note: The inner and outer layers of the above-mentioned air layer fabric have been incorporating composite fibers. These composite fibers improve the elasticity and toughness of the air layer fabric, effectively extending its service life. Furthermore, the air layer fabric offers excellent warmth retention.

[0007] Furthermore, the method for preparing the composite fiber includes the following steps:

[0008] S1. Polybutadiene, hydrogen peroxide, and acetic acid are added to a reaction vessel at a mass ratio of 1:0.2-0.4:5-7. Sodium molybdate is added to the reaction vessel, and then the reaction vessel is heated to 50-60°C and kept at that temperature for 3-5 hours. After the temperature is maintained, the acetic acid is evaporated to obtain epoxidized polybutadiene. The amount of sodium molybdate added is 0.8-1% of the mass of acetic acid.

[0009] S2. Polymethyl acrylate, allyltrimethylsilane, and dimethyl sulfoxide are placed in a reaction vessel at a mass ratio of 1:1.1-1.5:15-20. Palladium is added to the reaction vessel, which is then heated to 60-80°C and kept at that temperature for 2-4 hours. After the temperature is maintained, the dimethyl sulfoxide is evaporated to remove the allylated polymethyl acrylate. The amount of palladium added is 1-2% of the mass of dimethyl sulfoxide.

[0010] S3. Add epoxidized polybutadiene and allylated polymethyl acrylate to dimethyl sulfoxide to obtain a mixed solution; the mass ratio of epoxidized polybutadiene, allylated polymethyl acrylate and dimethyl sulfoxide is 1:1 to 1.5:5 to 10.

[0011] S4. Heat the mixed solution to 80-100℃, and gradually add sodium hydroxide solution to the mixed solution during the heating process. After heating is completed, keep the mixed solution at the temperature for 8-12 hours under stirring. After the temperature is completed, evaporate and remove dimethyl sulfoxide to obtain the mixed resin. The amount of sodium hydroxide solution added accounts for 2-5% of the total mass of the mixed solution.

[0012] S5. Melt spinning is performed on the mixed resin to obtain composite fibers.

[0013] Note: In the above method, the epoxidation of polybutadiene enhances its compatibility with polymethyl acrylate (PMMA). The epoxidized polybutadiene has hydroxyl groups, and the allylation of PMMA increases its strength and chemical reactivity. The allylated PMMA has ester groups, and the hydroxyl groups can undergo condensation reactions with the ester groups, forming a stable cross-linked composite structure between polybutadiene and PMMA. This results in composite fibers with good elasticity and toughness, as well as high mechanical strength and good wear resistance.

[0014] Further, in step S2, after adding palladium into the reaction vessel, nitrogen gas is introduced into the reaction vessel to make the pressure inside the reaction vessel reach 0.1-0.3 MPa.

[0015] Note: Filling the reaction with nitrogen gas prevents oxygen from the air from participating in the reaction and ensures the reaction pressure, making the reaction more complete.

[0016] Furthermore, in step S3, the allylated polymethyl acrylate and the epoxidized polybutadiene are washed with deionized water before being added to dimethyl sulfoxide.

[0017] Note: Washing can remove residues from allylated polymethyl acrylate and epoxidized polybutadiene, preventing residues from affecting subsequent reactions.

[0018] Further, in step S4, the mass concentration of the sodium hydroxide solution is 4-8%.

[0019] Note: Limiting the sodium hydroxide concentration can control the reaction rate and ensure that the reaction proceeds completely.

[0020] Furthermore, in step S4, the stirring speed is 300-500 r / min.

[0021] Note: Limiting the stirring speed can prevent the mixed solution from failing to react due to increased viscosity, thereby improving the conversion rate of the mixed resin.

[0022] Further, in step S5, the melt spinning step is as follows: the mixed resin is placed into the extruder barrel and heated to 220-250°C. Then, the mixed resin is sprayed out and stretched through the spinning nozzle at a stretching speed of 800-1000 m / min. After stretching, composite fibers are obtained.

[0023] Note: The above melt spinning parameters can ensure the strength of the composite fiber and reduce internal defects in the composite fiber.

[0024] On the other hand, the preparation method of the above-mentioned warm and antibacterial air layer fabric includes the following steps:

[0025] Step 1: The composite fiber and polyethylene fiber are blended and woven in the specified weight proportions to obtain the inner layer; the composite fiber and polyamide fiber are blended and woven in the specified weight proportions to obtain the outer layer.

[0026] Step 2: Apply polyurethane hot melt adhesive between the inner and outer layers to a thickness of 30-50 μm. Then press the inner and outer layers together at a pressure of 0.1-0.2 MPa and a temperature of 130-150°C to obtain the air layer fabric.

[0027] Step 3: Immerse the air layer fabric in the antibacterial finishing solution for 30-40 minutes at a liquor ratio of 1:10-20. Then remove the air layer fabric and dry it. After drying, you will get a warm and antibacterial air layer fabric.

[0028] Note: The above preparation method uses polyurethane hot melt adhesive to bond the inner layer and the outer layer. The bonding strength is high and it is washable, ensuring that an air layer is effectively formed between the inner and outer layers, thus ensuring the warmth retention performance of the air layer fabric. Then, an antibacterial finishing liquid is used to treat the air layer fabric, which improves the antibacterial performance of the air layer fabric, reduces bacterial growth, and improves the comfort of the fabric.

[0029] Furthermore, the antibacterial finishing solution comprises the following components by weight: 4-8 parts of hexadecyltrimethylammonium chloride, 1-2 parts of sodium benzoate, 5-10 parts of polyvinyl alcohol, 5-15 parts of silver nitrate, 3-5 parts of polyethylene glycol, and 60-70 parts of deionized water.

[0030] Note: The above antibacterial finishing solution has good finishing properties. After finishing, it can effectively improve the antibacterial properties of the air layer fabric without damaging the fiber structure, thus ensuring the mechanical properties of the air layer fabric.

[0031] The beneficial effects of this invention are:

[0032] (1) The air layer fabric of the present invention has composite fibers added to both the inner and outer layers. The composite fibers improve the elasticity and toughness of the air layer fabric, which can effectively improve the service life of the air layer fabric and the air layer fabric has excellent heat retention performance.

[0033] (2) The present invention prepares composite fibers by condensation reaction between epoxidized polybutadiene and allylated polymethyl acrylate, so that a stable cross-linked composite structure is formed between polybutadiene and polymethyl acrylate, and the prepared composite fibers have good elasticity and toughness, as well as high mechanical strength and good wear resistance.

[0034] (3) The preparation method of the present invention uses polyurethane hot melt adhesive to bond the inner layer and the outer layer, which has high bonding strength and is resistant to washing. Then, the air layer fabric is treated with antibacterial finishing liquid, which improves the antibacterial performance of the air layer fabric, reduces bacterial growth, and improves the comfort of the fabric. Detailed Implementation

[0035] To further illustrate the methods and effects of this invention, the technical solution of this invention will be clearly and completely described below in conjunction with experiments.

[0036] Example 1: A toughened and elastic warm antibacterial air layer fabric, comprising an inner layer and an outer layer. The inner layer comprises, by weight, the following components: 35 parts composite fiber and 50 parts polyethylene fiber; the outer layer comprises, by weight, the following components: 25 parts composite fiber and 65 parts polyamide fiber.

[0037] The method for preparing the composite fiber includes the following steps:

[0038] S1. Polybutadiene, hydrogen peroxide, and acetic acid are added to a reaction vessel in a mass ratio of 1:0.3:6. Sodium molybdate is added to the reaction vessel, and then the reaction vessel is heated to 55°C and kept at that temperature for 4 hours. After the temperature is maintained, the acetic acid is evaporated to obtain epoxidized polybutadiene. The amount of sodium molybdate added is 0.9% of the mass of acetic acid.

[0039] S2. Polymethyl acrylate, allyltrimethylsilane, and dimethyl sulfoxide were placed in a reaction vessel at a mass ratio of 1:1.3:18. Palladium was added to the reaction vessel, and nitrogen gas was introduced into the reaction vessel to make the pressure inside the reaction vessel reach 0.2 MPa. The reaction vessel was heated to 70°C and kept at this temperature for 3 hours. After the holding time was completed, the dimethyl sulfoxide was evaporated to obtain allylated polymethyl acrylate. The amount of palladium added accounted for 1.5% of the mass of dimethyl sulfoxide.

[0040] S3. The allylated polymethyl acrylate and epoxidized polybutadiene were washed with deionized water. The epoxidized polybutadiene and allylated polymethyl acrylate were then added to dimethyl sulfoxide to obtain a mixed solution. The mass ratio of epoxidized polybutadiene, allylated polymethyl acrylate and dimethyl sulfoxide was 1:1.2:8.

[0041] S4. Heat the mixed solution to 90℃, and gradually add sodium hydroxide solution to the mixed solution during the heating process. After heating is completed, keep the mixed solution at the temperature for 10 hours under stirring at a stirring speed of 400 r / min. After the temperature is completed, evaporate and remove dimethyl sulfoxide to obtain the mixed resin. The amount of sodium hydroxide solution added accounts for 3.5% of the total mass of the mixed solution, and the mass concentration of sodium hydroxide solution is 6%.

[0042] S5. Melt spinning of the mixed resin. The melt spinning steps are as follows: the mixed resin is placed in the extruder barrel and heated to 235°C. Then, the mixed resin is sprayed out and stretched through the spinning nozzle at a stretching speed of 900 m / min. After stretching, composite fibers are obtained.

[0043] The preparation method of the above-mentioned warm and antibacterial air layer fabric includes the following steps:

[0044] Step 1: The composite fiber and polyethylene fiber are blended and woven in the specified weight proportions to obtain the inner layer; the composite fiber and polyamide fiber are blended and woven in the specified weight proportions to obtain the outer layer.

[0045] Step 2: Apply polyurethane hot melt adhesive between the inner and outer layers to a thickness of 40μm. Then press the inner and outer layers together at a pressure of 0.15MPa and a temperature of 140℃ to obtain the air layer fabric.

[0046] Step 3: Immerse the air layer fabric in the antibacterial finishing solution for 35 minutes at a liquor ratio of 1:15. Then remove the air layer fabric and dry it. After drying, you will get a warm and antibacterial air layer fabric.

[0047] The antibacterial finishing solution comprises the following components by weight: 6 parts hexadecyltrimethylammonium chloride, 1.5 parts sodium benzoate, 8 parts polyvinyl alcohol, 10 parts silver nitrate, 4 parts polyethylene glycol, and 65 parts deionized water.

[0048] Example 2: This example is basically the same as Example 1, except that the inner layer includes the following components by weight: 30 parts of composite fiber and 40 parts of polyethylene fiber.

[0049] Example 3: This example is basically the same as Example 1, except that the inner layer includes the following components by weight: 40 parts of composite fiber and 60 parts of polyethylene fiber.

[0050] Example 4: This example is basically the same as Example 1, except that the outer layer includes the following components by weight: 20 parts of composite fiber and 60 parts of polyamide fiber.

[0051] Example 5: This example is basically the same as Example 1, except that the outer layer includes the following components by weight: 30 parts of composite fiber and 70 parts of polyamide fiber.

[0052] Example 6: This example is basically the same as Example 1, except that polybutadiene, hydrogen peroxide and acetic acid are added to the reaction vessel in a ratio of 1:0.2:5.

[0053] Example 7: This example is basically the same as Example 1, except that polybutadiene, hydrogen peroxide and acetic acid are added to the reaction vessel in a ratio of 1:0.4:7.

[0054] Example 8: This example is basically the same as Example 1, except that the amount of sodium molybdate added is 0.8% of the mass of acetic acid.

[0055] Example 9: This example is basically the same as Example 1, except that the amount of sodium molybdate added is 1% of the mass of acetic acid.

[0056] Example 10: This example is basically the same as Example 1, except that polymethyl acrylate, allyltrimethylsilane and dimethyl sulfoxide are placed in the reaction vessel in a mass ratio of 1:1.1:15.

[0057] Example 11: This example is basically the same as Example 1, except that polymethyl acrylate, allyltrimethylsilane and dimethyl sulfoxide are placed in the reaction vessel in a mass ratio of 1:1.5:20.

[0058] Example 12: This example is basically the same as Example 1, except that the amount of palladium added is 1% of the mass of dimethyl sulfoxide.

[0059] Example 13: This example is basically the same as Example 1, except that the amount of palladium added is 2% of the mass of dimethyl sulfoxide.

[0060] Example 14: This example is basically the same as Example 1, except that the mass ratio of epoxidized polybutadiene, allylated polymethyl acrylate, and dimethyl sulfoxide is 1:1:5.

[0061] Example 15: This example is basically the same as Example 1, except that the mass ratio of epoxidized polybutadiene, allylated polymethyl acrylate, and dimethyl sulfoxide is 1:1.5:10.

[0062] Example 16: This example is basically the same as Example 1, except that the amount of sodium hydroxide solution added accounts for 2% of the total mass of the mixed solution.

[0063] Example 17: This example is basically the same as Example 1, except that the amount of sodium hydroxide solution added accounts for 5% of the total mass of the mixed solution.

[0064] Example 18: This example is basically the same as Example 1, except that the air layer fabric is immersed in the antibacterial finishing solution at a liquor ratio of 1:10.

[0065] Example 19: This example is basically the same as Example 1, except that the air layer fabric is immersed in the antibacterial finishing solution at a liquor ratio of 1:20.

[0066] Example 20: This example is basically the same as Example 1, except that the antibacterial finishing solution includes the following components by weight: 4 parts hexadecyltrimethylammonium chloride, 1 part sodium benzoate, 5 parts polyvinyl alcohol, 5 parts silver nitrate, 3 parts polyethylene glycol, and 60 parts deionized water.

[0067] Example 21: This example is basically the same as Example 1, except that the antibacterial finishing solution includes the following components by weight: 8 parts hexadecyltrimethylammonium chloride, 2 parts sodium benzoate, 10 parts polyvinyl alcohol, 15 parts silver nitrate, 5 parts polyethylene glycol, and 70 parts deionized water.

[0068] Comparative Example 1: Referring to Example 1, the composite fiber was replaced with polymethyl methacrylate fiber.

[0069] Comparative Example 2: Referring to Example 1, the epoxidized polybutadiene was replaced with polybutadiene.

[0070] Comparative Example 3: Referring to Example 1, allylated polymethyl acrylate was replaced with polymethyl acrylate.

[0071] Experimental Example: To investigate the influence of parameters in each embodiment on fabric performance, performance tests were conducted on the fabrics prepared in each embodiment. The specific investigation is as follows:

[0072] Experiment Example 1: Investigating the Influence of Composition on Fabric Properties

[0073] Using Examples 1-5 and Comparative Example 1 as experimental comparisons, the fabric properties under different compositions are shown in Table 1 below:

[0074] Table 1 Fabric properties under different compositions

[0075] Group Elongation at Break / % Example 1 5 6 5 Example 2 5 2 7 Example 3 5 3 4 Example 4 5 4 3 Example 5 5 2 8 Comparative Example 1 3 1 0 surface

[0076] As shown in Table 1, compared with Examples 1 to 5, the fabric of Example 1 has the highest elongation at break, indicating that the fabric of Example 1 has the best elasticity and toughness. Therefore, the fabric composition selected in Example 1 is the best.

[0077] Compared with Comparative Example 1, after replacing the composite fiber with polymethyl methacrylate fiber, the breaking elongation of the fabric in Example 1 was significantly reduced. This may be because polymethyl methacrylate fiber has poor elasticity. Therefore, the composite fiber selected in Example 1 is better.

[0078] Experiment Example 2: Investigating the effects of epoxidized polybutadiene preparation parameters on fabric properties.

[0079] Using Examples 1, 6-9, and Comparative Example 2 as comparative experiments, the fabric properties of epoxidized polybutadiene under different preparation parameters are shown in Table 2 below:

[0080] Table 2 Fabric properties under different preparation parameters of epoxidized polybutadiene

[0081] Group Elongation at Break / % Example 1 5 6 5 Example 6 5 3 5 Example 7 5 5 4 Example 8 5 4 7 Example 9 5 6 9 Comparative Example 2 4 2 3 surface

[0082] As shown in Table 2, compared with Examples 1, 6, and 7, the fabric of Example 1 has the highest elongation at break, indicating that the fabric of Example 1 has the best elasticity and toughness. This may be because the polybutadiene epoxidation reaction of Example 1 is the most complete, and it has the best compatibility with allylated polymethyl acrylate. Therefore, the ratio of polybutadiene, hydrogen peroxide and acetic acid selected in Example 1 is the optimal.

[0083] Compared with Examples 1, 8, and 9, the breaking elongation of the fabric gradually increased with the increase of sodium molybdate addition, until the breaking elongation of the fabric in Example 1 reached the highest. With the continued increase of sodium molybdate addition, the breaking elongation of the fabric began to show no significant change. This may be because the polybutadiene has fully undergone the epoxidation reaction. From a cost perspective, the sodium molybdate addition amount selected in Example 1 is optimal.

[0084] Compared with Comparative Example 2, after replacing the epoxidized polybutadiene with polybutadiene, the elongation at break of the fabric in Example 1 was significantly reduced. This may be because the compatibility between polybutadiene and allylated polymethyl acrylate is too poor, and a stable cross-linking structure cannot be formed. Therefore, the epoxidized polybutadiene selected in Example 1 is better.

[0085] Experiment Example 3: Investigating the Influence of Allylated Polymethyl Acrylate Preparation Parameters on Fabric Properties

[0086] Using Examples 1, 10-13, and Comparative Example 3 as comparative experiments, the fabric properties of allylated polymethyl acrylate under different preparation parameters are shown in Table 3 below:

[0087] Table 3 Fabric properties of allylated polymethyl acrylate under different preparation parameters

[0088]

[0089]

[0090] As shown in Table 3, compared with Examples 1, 10 and 11, the fabric of Example 1 has the highest elongation at break, indicating that the fabric of Example 1 has the best elasticity and toughness. This may be because the allylated polymethyl acrylate of Example 1 has the highest conversion rate and the cross-linking structure formed between it and the epoxidized polybutadiene is more stable. Therefore, the ratio of polymethyl acrylate, allyltrimethylsilane and dimethyl sulfoxide selected in Example 1 is the optimal.

[0091] Compared with Examples 1, 12, and 13, the elongation at break of the fabric gradually increased with the increase of palladium addition, until the elongation at break of the fabric in Example 1 reached the highest level. With the continued increase of palladium addition, the elongation at break of the fabric began to show no significant change. This may be because the conversion rate of allylated polymethyl acrylate has reached the highest level. From a cost perspective, the palladium addition amount selected in Example 1 is optimal.

[0092] Compared with Comparative Example 3, the fabric elongation at break was significantly reduced after replacing allylated polymethyl acrylate with polymethyl acrylate in Example 1. This may be because polymethyl acrylate and epoxidized polybutadiene cannot form a stable cross-linking structure. Therefore, the allylated polymethyl acrylate selected in Example 1 is better.

[0093] Experiment Example 4: Investigating the Influence of Mixed Resin Preparation Parameters on Fabric Properties

[0094] Using Examples 1 and 14-17 as comparative experiments, the fabric properties under different preparation parameters of the mixed resin are shown in Table 4 below:

[0095] Table 4 Fabric properties under different preparation parameters of mixed resins

[0096] Group Elongation at Break / % Example 15 65 Example 14 537 Example 15 529 Example 16 549 Example 17 533 surface

[0097] As shown in Table 4, compared with Examples 1, 14, and 15, the fabric of Example 1 has the highest elongation at break, indicating that the fabric of Example 1 has the best elasticity and toughness. This may be because the epoxidized polybutadiene and allylated polymethyl acrylate reacted most fully in Example 1, and the resulting cross-linked structure had the best elasticity. Therefore, the ratio of epoxidized polybutadiene, allylated polymethyl acrylate, and dimethyl sulfoxide selected in Example 1 was the optimal.

[0098] Compared with Examples 1, 16, and 17, the fabric of Example 1 has the highest elongation at break, indicating that the fabric of Example 1 has the best elasticity and toughness. This may be because the yield of the condensation reaction between epoxidized polybutadiene and allylated polymethyl acrylate is the highest at the pH value of Example 1. Therefore, the amount of sodium hydroxide solution added in Example 1 is optimal.

[0099] Experiment Example 5: Investigating the Influence of Antibacterial Finishing Parameters on Fabric Properties

[0100] Using Examples 1, 18-21, and Comparative Example 4 as comparative experiments, the fabric performance under different antibacterial finishing parameters is shown in Table 5 below:

[0101] Table 5 Fabric performance under different parameters of antibacterial finishing

[0102]

[0103] As shown in Table 5, compared with Examples 1, 18, and 19, the fabric of Example 1 has the highest antibacterial rate against Escherichia coli and Staphylococcus aureus, indicating that the fabric of Example 1 has the best antibacterial performance. This may be because the antibacterial finishing effect of Example 1 is the best, and therefore the bath ratio selected in Example 1 is optimal.

[0104] Compared with Examples 1, 20, and 21, the fabric of Example 1 showed the highest antibacterial rate against Escherichia coli and Staphylococcus aureus, indicating that the fabric of Example 1 had the best antibacterial performance. This may be because the fabric had the best absorption effect on the antibacterial finishing liquid of Example 1. Therefore, the antibacterial finishing liquid component selected in Example 1 was optimal.

Claims

1. A toughened, elastic, warm, and antibacterial air-layer fabric, characterized in that, The fabric comprises an inner layer and an outer layer. The inner layer, by weight, comprises the following components: 30-40 parts of composite fiber and 40-60 parts of polyethylene fiber. The outer layer, by weight, comprises the following components: 20-30 parts of composite fiber and 60-70 parts of polyamide fiber. The preparation method of the composite fiber includes the following steps: S1, adding polybutadiene, hydrogen peroxide, and acetic acid to a reaction vessel at a mass ratio of 1:0.2-0.4:5-7, adding sodium molybdate to the reaction vessel, then heating the reaction vessel to 50-60°C and holding it at that temperature for 3-5 hours. After the holding period, acetic acid is evaporated to obtain epoxidized polybutadiene. The amount of sodium molybdate added is 0.8-1% of the mass of acetic acid. S2, adding polymethyl acrylate, allyltrimethylsilane, and dimethyl sulfoxide to a reaction vessel at a mass ratio of 1:1.1-1.5:15-20, adding palladium to the reaction vessel, and heating the reaction vessel to... The mixture is heated to 60-80℃ and kept at that temperature for 2-4 hours. After the heating is completed, dimethyl sulfoxide is evaporated to obtain allylated polymethyl acrylate. The amount of palladium added accounts for 1-2% of the mass of dimethyl sulfoxide. S3, epoxidized polybutadiene and allylated polymethyl acrylate are added to dimethyl sulfoxide to obtain a mixed solution. The mass ratio of epoxidized polybutadiene, allylated polymethyl acrylate and dimethyl sulfoxide is 1:1-1.5:5-10. S4, the mixed solution is heated to 80-100℃, and sodium hydroxide solution is gradually added to the mixed solution during the heating process. After the heating is completed, the mixed solution is kept at that temperature for 8-12 hours under stirring. After the heating is completed, dimethyl sulfoxide is evaporated to obtain a mixed resin. The mass concentration of sodium hydroxide solution is 4-8%, and the amount of sodium hydroxide solution added accounts for 2-5% of the total mass of the mixed solution. S5, the mixed resin is melt-spun to obtain composite fibers.

2. The toughened, elastic, warm, and antibacterial air-layer fabric according to claim 1, characterized in that, In step S2, after adding palladium into the reaction vessel, nitrogen gas is introduced into the reaction vessel to make the pressure inside the reaction vessel reach 0.1~0.3MPa.

3. The toughened, elastic, warm, and antibacterial air-layer fabric according to claim 1, characterized in that, In step S3, the allylated polymethyl acrylate and the epoxidized polybutadiene are washed with deionized water before being added to dimethyl sulfoxide.

4. The toughened, elastic, warm, and antibacterial air-layer fabric according to claim 1, characterized in that, In step S4, the stirring speed is 300~500 r / min.

5. The toughened, elastic, warm, and antibacterial air-layer fabric according to claim 1, characterized in that, In step S5, the melt spinning step is as follows: the mixed resin is placed into the extruder barrel and heated to 220~250℃. Then, the mixed resin is sprayed out and stretched through the spinning nozzle at a stretching speed of 800~1000m / min. After stretching, composite fibers are obtained.

6. A method for preparing a toughened, elastic, warm, and antibacterial air-layer fabric, used to prepare the toughened, elastic, warm, and antibacterial air-layer fabric as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Blend and weave the composite fiber and polyethylene fiber in the specified weight proportions to obtain the inner layer; blend and weave the composite fiber and polyamide fiber in the specified weight proportions to obtain the outer layer; Step 2: Apply polyurethane hot melt adhesive between the inner and outer layers to a thickness of 30-50 μm, then press the inner and outer layers together at a pressure of 0.1-0.2 MPa and a temperature of 130-150°C to obtain the air layer fabric; Step 3: Immerse the air layer fabric in the antibacterial finishing solution for 30-40 minutes at a liquor ratio of 1:10-20. Then remove the air layer fabric and dry it. After drying, you will get a warm and antibacterial air layer fabric.

7. The method for preparing a toughened, elastic, warm, and antibacterial air-layer fabric according to claim 6, characterized in that, The antibacterial finishing solution comprises the following components by weight: 4-8 parts hexadecyltrimethylammonium chloride, 1-2 parts sodium benzoate, 5-10 parts polyvinyl alcohol, 5-15 parts silver nitrate, 3-5 parts polyethylene glycol, and 60-70 parts deionized water.

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