Breathable laminating material for down jacket and preparation method of breathable laminating material

Abstract

The invention relates to the technical field of film-covered fabric manufacturing, in particular to a breathable film-covered material for down jackets and a preparation method of the breathable film-covered material. The composite material is composed of an outer layer, a middle film coating layer and an inner layer, the outer layer is nylon, the middle film coating layer comprises a fullerene-castor oil modified epoxy resin composite material, a nano silicon dioxide-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is polyester eyelet fabric. The spherical structure of the fullerene and the two-dimensional lamellar structure of the graphene form space complementation, and a micro-pore and mesoporous system in gradient distribution is constructed in cooperation with the'molecular pillar 'effect of the nano-silica. A selective transmission channel is formed through balanced distribution of hydrophobic long-chain groups and hydrophilic functional groups in the material, and water molecule aggregate blocking and water vapor molecule directional transmission are achieved. The multi-layer closed air hole structure and the heat conduction characteristics of all the components have a synergistic effect, and the heat preservation effect is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing laminated fabrics, and particularly to a breathable laminated material for down jackets and a preparation method thereof. Background Art

[0002] At present, breathable laminated materials for down jackets are widely used in the field of functional clothing, and their development has experienced an evolution process from single function to multi-functional composite. Traditional laminated materials mainly use high molecular materials such as polyurethane (PU) or polytetrafluoroethylene (PTFE). Although they have good waterproof performance, their breathability often fails to meet the wearing requirements. Especially during strenuous exercise or when the environmental temperature changes greatly, due to the increase in human sweating, if the fabric breathability is insufficient, water vapor cannot be discharged in time, forming a humid environment inside the clothing, seriously affecting the wearing comfort.

[0003] The balance between breathability and waterproofness is the main technical problem faced by current laminated materials. Improving breathability usually requires increasing the porosity of the material or improving its hydrophilicity, but this often reduces the waterproof effect of the material. The micro-porous breathable technology currently used in the market, although achieving a combination of breathability and waterproofness to a certain extent, its performance stability still needs to be improved. Especially after multiple washes or long-term use, the micro-porous structure is prone to blockage or deformation, resulting in a decline in breathability performance. In addition, the performance of traditional laminated materials varies greatly in different temperature and humidity environments, making it difficult to meet the all-weather use requirements.

[0004] The stability of the warming effect is another important issue. The warmth retention of down jackets mainly depends on the fluffiness of the down, and the performance of the laminated material will directly affect the fluffy state of the down. The current laminated materials are prone to a problem of decreased breathability after getting wet, which not only affects the fluffiness of the down but also reduces its warming effect. At the same time, the traditional laminated materials have a relatively high thermal conductivity, and are prone to form a cold bridge effect in cold environments, affecting the overall warming performance. In addition, the structural stability of the existing laminated materials is easily damaged after repeated compression and stretching, resulting in a gradual attenuation of the functional performance. Summary of the Invention

[0005] (1) Technical Problems to be Solved The purpose of the present invention is to provide a breathable laminated material for down jackets and a preparation method thereof, so as to solve the balance problem between breathability and waterproofness of the existing breathable laminated materials for down jackets and enhance the warming effect.

[0006] (2) Technical Solutions To achieve the above object, on the one hand, the present invention provides a breathable film material for down jackets, which is composed of an outer layer, an intermediate film layer and an inner layer. The outer layer is nylon, the intermediate film layer includes a fullerene-castor oil modified epoxy resin composite material, a nano-silica-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0007] Further, the outer layer includes the following raw materials in parts by weight: 15-25 parts of nylon; the intermediate film layer includes the following raw materials in parts by weight: 30-40 parts of fullerene-castor oil modified epoxy resin composite material, 20-30 parts of nano-silica-graphene modified chitosan composite material, 1-3 parts of liquid nitrile rubber; the inner layer includes the following raw materials in parts by weight: 15-25 parts of polyester mesh fabric.

[0008] Further, the preparation method of the fullerene-castor oil modified epoxy resin composite material includes: S11. Add fullerene-C 60 to tetrahydrofuran and ultrasonicate for 30-40 min to obtain a pretreated fullerene-C 60 solution; S12. Add castor oil to epoxy resin, and then stir at a temperature of 80-90 °C and a rotation speed of 200-300 rpm for 2-3 h to obtain castor oil modified epoxy resin; S13. Slowly add the pretreated fullerene-C 60 solution to the castor oil modified epoxy resin, then stir for 30-40 min to obtain a stirred mixture. Ultrasonicate the stirred mixture for 15-30 min to obtain an ultrasonated mixture. Vacuum degas the ultrasonated mixture for 20-30 min to obtain a vacuum degassed mixture. Add methyltetrahydrophthalic anhydride to the vacuum degassed mixture to obtain a mixture; S14. Apply polydimethylsiloxanol on the surface of the mold to obtain a pretreated mold. Pour the mixture into the pretreated mold for stepwise curing. First, keep it at 80-90 °C for 2-3 h, then at 120-130 °C for 2-3 h, and finally cure at 150-160 °C for 2-3 h to obtain a cured product. Cool the cured product to room temperature to obtain the fullerene-castor oil modified epoxy resin composite material.

[0009] Further, the preparation method of the nano-silica-graphene modified chitosan composite material includes: S21. Add graphene oxide to deionized water and then ultrasonicate for 50-60 min to obtain a graphene oxide dispersion; S22. Add chitosan to a 2-5 wt% acetic acid solution and then stir at 300-400 rpm for 4-5 h to obtain a chitosan solution; S23. Vacuum-dry the nano-silica at 80 - 90 °C for 4 - 5 h to obtain pre-treated nano-silica. Add 3-aminopropyltriethoxysilane to the pre-treated nano-silica, and then react at 80 - 90 °C for 2 - 3 h to obtain the reacted nano-silica. Centrifuge the reacted nano-silica at 8000 - 9000 rpm for 10 - 20 min to obtain the centrifuged nano-silica. Wash the centrifuged nano-silica with ethanol 3 - 4 times to obtain the washed nano-silica. Dry the washed nano-silica at 60 - 70 °C for 12 - 18 h to obtain the surface-modified nano-silica; S24. Add the surface-modified nano-silica to the graphene oxide dispersion, and then ultrasonicate for 30 - 40 min to obtain a mixed dispersion. Slowly drop the mixed dispersion into the chitosan solution, and then stir at 300 - 400 rpm for 2 - 3 h to obtain Solution A. Ultrasonicate Solution A for 30 - 40 min to obtain Solution B. Add the glutaraldehyde solution to Solution B to obtain Solution C. Stir Solution C for 30 - 40 min to obtain Solution D; S25. Pour Solution D into a polytetrafluoroethylene mold, and then let it stand at room temperature for 12 - 24 h to obtain Product A. Dry Product A in an oven at 50 - 60 °C for 24 - 36 h to obtain Product B. Immerse Product B in deionized water for 24 - 36 h to obtain Product C. Vacuum-dry Product C at 50 - 60 °C for 12 - 24 h to obtain the nano-silica-graphene modified chitosan composite material.

[0010] On the other hand, based on the same inventive concept, the present invention also provides a preparation method of a breathable coating material for down jackets, which is applied to the breathable coating material for down jackets described above, and includes the following steps: S31. Dry the nylon fabric at 60 - 70 °C for 30 - 40 min to obtain the dried nylon fabric. Let the dried nylon fabric cool naturally to room temperature to obtain the outer layer material; S32. Mix and stir the fullerene-castor oil modified epoxy resin composite material, the nano-silica-graphene modified chitosan composite material and the liquid nitrile rubber for 30 - 40 min, and then vacuum degas for 15 - 20 min to obtain the intermediate coating layer; S33. Uniformly coat the middle film layer on the outer layer material with a coating thickness of 0.2 - 0.3 mm to obtain a coating layer. Cover the inner layer of polyester mesh fabric on the coating layer to obtain a preliminary film material. Thermally press and compound the preliminary film material at 130 - 140 °C and 0.5 - 0.8 MPa for 60 - 90 s to obtain a secondary film material. Cold press and shape the secondary film material at 0.5 - 0.6 MPa for 30 - 40 s to obtain a tertiary film material. Naturally air-dry the tertiary film material for 24 - 48 h to obtain a breathable film material for down jackets.

[0011] The mechanism of action of the above raw material components is as follows: Nylon: As the main outer layer material, it has excellent mechanical strength and wear resistance, and at the same time has certain hygroscopicity and breathability, which can provide good physical support and basic functional properties for the entire composite material.

[0012] Fullerene-castor oil modified epoxy resin composite material: The cage structure of fullerene can undergo a ring-opening addition reaction with the hydroxyl groups in castor oil molecules to form macromolecules with a three-dimensional network structure, while the long-chain fatty acid groups in castor oil molecules endow the material with good flexibility and hydrophobic characteristics. The epoxy resin matrix undergoes a cross-linking reaction with the network structure formed by fullerene and castor oil through its epoxy groups, providing excellent mechanical properties and structural stability.

[0013] Nano-silica-graphene modified chitosan composite material: The silanol groups on the surface of nano-scale silica particles can form multiple hydrogen bond networks with the amino and hydroxyl groups in chitosan molecules, and the lamellar structure of graphene can not only form strong interactions with chitosan macromolecular chains through π-π stacking and chemical bonding, but also significantly improve the mechanical properties and thermal conductivity of the composite material.

[0014] Liquid nitrile rubber: It plays a toughening and bonding role in the middle film layer. Its good elasticity and flexibility can improve the mechanical properties and durability of the composite material. At the same time, the polar groups in its molecular chain can form a well-compatible interfacial structure with other components, enhancing the interlayer bonding force. Polyester mesh fabric: As the inner layer material, its mesh structure provides a large number of tiny air layers. These static air layers can effectively block heat transfer. At the same time, the mesh structure can also form capillary channels to promote the rapid diffusion and transmission of moisture, which is beneficial to improving the breathable and sweat-wicking performance of the material. The excellent shape retention and dimensional stability of polyester itself also ensure that this mesh structure can remain stable during use.

[0015] (3) Beneficial effects Compared with the prior art, the beneficial effects of the present invention are: 1. A composite structure of fullerene-castor oil modified epoxy resin and nano-silica-graphene modified chitosan forms a microporous and mesoporous system with a gradient distribution. Combined with the regular alternating distribution of hydrophobic and hydrophilic regions, it can effectively block water molecule aggregates while allowing single water vapor molecules to pass through, improving the breathable and waterproof performance.

[0016] 2. Utilizing the reversible change characteristics of hydroxyl and amino groups on the chitosan molecular chain in different humidity environments, combined with the basic waterproof barrier provided by the epoxy resin network, a system that can automatically adjust the pore size according to environmental humidity is formed, achieving a dynamic balance between breathability and waterproofness.

[0017] 3. Through the isotropic heat conduction characteristics of fullerene, the anisotropic heat conduction characteristics of graphene, and the stationary gas layer formed by multi-level closed pores, the thermal insulation performance of the material is significantly improved while maintaining good breathable and waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a physical diagram of the breathable film material for down jackets in Example 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] The test equipment and preparations for the following embodiments are as follows: Electronic balance (Sartorius, Germany), electrothermal blast drying oven (Shanghai Fuma Experimental Equipment), electrothermal constant temperature water bath (Jiangsu Keduo), magnetic stirrer (Shanghai Meiyingpu), ultrasonic cleaner (Shanghai Bilang), vacuum degassing machine (Shenzhen Yingtai), centrifuge (Hunan Kaida), vacuum oven (Chengdu Henglutong), sprayer (Taizhou Huangyan), coater (Wuxi Aidwance), hot press (Hebei Qianhui), cold press (Qingdao Guangyu); Chemicals and reagents are purchased from Sigma-Aldrich.

[0021] Example 1: This example discloses a breathable film material for down jackets, which consists of an outer layer, an intermediate film layer, and an inner layer. The outer layer is nylon, the intermediate film layer includes a fullerene-castor oil modified epoxy resin composite material, a nano-silica-graphene modified chitosan composite material, and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0022] The outer layer comprises the following raw materials in parts by weight: 18 parts of nylon; the middle coating layer comprises the following raw materials in parts by weight: 32 parts of fullerene-castor oil modified epoxy resin composite material, 26 parts of nano-silicon dioxide-graphene modified chitosan composite material, and 2 parts of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 18 parts of polyester mesh cloth.

[0023] In the design of the breathable covering material of the down jacket, the spherical structure of fullerene in the fullerene-castor oil modified epoxy resin composite material forms spatial complementarity with the two-dimensional lamellar structure of graphene in the nano-silica-graphene modified chitosan composite material, and the nano-silica particles play the role of "molecular pillars" between the layers. The smaller pores come from the gaps between the graphene molecules, and the larger pores come from the gaps formed by the nano-silica support, which can form a microporous and mesoporous system with a gradient distribution. At the same time, the hydrophobic long-chain groups in the castor oil molecules and the hydrophilic functional groups in the chitosan molecules achieve an amphiphilic balance, forming a directional and selective microporous transmission channel. This directionality and selectivity are derived from the formation of a channel structure with alternating distribution of hydrophobic regions and hydrophilic regions on a microscopic scale during the material formation process. This regular amphiphilic distribution not only provides a preferential path for the movement of water molecules, but the spatial arrangement of different hydrophilic and hydrophobic regions also affects the size of the channel.

[0024] This composite system achieves effective barrier to water molecule aggregates and directional transmission of water vapor molecules by regulating the distribution of micropore size so that its size is just between water molecule aggregates and single water vapor molecules, and coordinates the spatial distribution of hydrophobic and hydrophilic regions in the material. At the same time, the basic waterproof barrier provided by the epoxy resin network is combined with the reversible change characteristics of the pore size of the chitosan layer under different ambient humidity. This reversible change characteristic is due to the abundant hydroxyl and amino groups on the chitosan molecular chain, which makes it significantly hygroscopic. When the ambient humidity rises, these hydrophilic groups will absorb water molecules, causing the molecular chain to expand and the molecular distance to increase. When the humidity decreases, they will shrink, forming an intelligent dynamic adjustment system to ensure the optimal balance between breathability and waterproofness.

[0025] More importantly, due to the large number of unconnected closed pores in the multi-level pore structure system, the gases wrapped inside the material cannot flow and form a stable static gas layer. At the same time, fullerene has isotropic thermal conductivity, while graphene has extremely high thermal conductivity in the plane direction and low in the vertical direction, which can achieve directional heat transfer. In addition, the multi-level structure and different thermal conductivity of each component in the material make the heat transfer process hindered and regulated layer by layer, and the heat transfer from the outside to the inside gradually slows down, forming a temperature gradient. These work together to establish a heat management system, improve the thermal insulation performance of the material, and finally realize a high-performance coating material system that integrates multiple functions of breathability, waterproofness and thermal insulation, such asFigure 1 as shown

[0026] The preparation method of the fullerene-castor oil modified epoxy resin composite material includes: S11. Add fullerene-C 60 to tetrahydrofuran and ultrasonicate for 30 - 40 min to obtain a pretreated fullerene-C 60 solution; S12. Add castor oil to epoxy resin, and then stir at a temperature of 80 - 90 °C and a rotation speed of 200 - 300 rpm for 2 - 3 h to obtain castor oil modified epoxy resin; S13. Slowly add the pretreated fullerene-C 60 solution to the castor oil modified epoxy resin, then stir for 30 - 40 min to obtain a stirred mixture. Ultrasonicate the stirred mixture for 15 - 30 min to obtain an ultrasonically treated mixture. Vacuum degas the ultrasonically treated mixture for 20 - 30 min to obtain a vacuum degassed mixture. Add methyltetrahydrophthalic anhydride to the vacuum degassed mixture to obtain a mixture; S14. Apply polydimethylsiloxanol on the surface of the mold to obtain a pretreated mold. Pour the mixture into the pretreated mold for stepwise curing. First, keep it at 80 - 90 °C for 2 - 3 h, then at 120 - 130 °C for 2 - 3 h, and finally cure at 150 - 160 °C for 2 - 3 h to obtain a cured product. Cool the cured product to room temperature to obtain the fullerene-castor oil modified epoxy resin composite material.

[0027] The preparation method of the nano-silica-graphene modified chitosan composite material includes: S21. Add graphene oxide to deionized water and then ultrasonicate for 50 - 60 min to obtain a graphene oxide dispersion; S22. Add chitosan to a 2 - 5 wt% acetic acid solution and then stir at 300 - 400 rpm for 4 - 5 h to obtain a chitosan solution; S23. Vacuum dry nano-silica at 80 - 90 °C for 4 - 5 h to obtain pretreated nano-silica. Add 3-aminopropyltriethoxysilane to the pretreated nano-silica and then react at 80 - 90 °C for 2 - 3 h to obtain reacted nano-silica. Centrifuge the reacted nano-silica at 8000 - 9000 rpm for 10 - 20 min to obtain centrifuged nano-silica. Wash the centrifuged nano-silica with ethanol 3 - 4 times to obtain washed nano-silica. Dry the washed nano-silica at 60 - 70 °C for 12 - 18 h to obtain surface modified nano-silica; S24. Add the surface-modified nano-silica into the graphene oxide dispersion liquid, then ultrasonicate for 30 - 40 min to obtain a mixed dispersion liquid. Slowly drop the mixed dispersion liquid into the chitosan solution, and then stir at 300 - 400 rpm for 2 - 3 h to obtain solution A. Ultrasonicate solution A for 30 - 40 min to obtain solution B. Add glutaraldehyde solution into solution B to obtain solution C. Stir solution C for 30 - 40 min to obtain solution D; S25. Pour solution D into a polytetrafluoroethylene mold, and then let it stand at room temperature for 12 - 24 h to obtain product A. Dry product A in an oven at 50 - 60 °C for 24 - 36 h to obtain product B. Soak product B in deionized water for 24 - 36 h to obtain product C. Vacuum-dry product C at 50 - 60 °C for 12 - 24 h to obtain the nano-silica-graphene modified chitosan composite material.

[0028] A preparation method of a breathable film material for down jackets, applied to the breathable film material for down jackets described above, includes the following steps: S31. Dry the nylon fabric at 60 - 70 °C for 30 - 40 min to obtain the dried nylon fabric, and let the dried nylon fabric cool naturally to room temperature to obtain the outer layer material; S32. Mix and stir the fullerene-castor oil modified epoxy resin composite material, nano-silica-graphene modified chitosan composite material and liquid nitrile rubber for 30 - 40 min, and then vacuum degas for 15 - 20 min to obtain the intermediate film layer; S33. Uniformly coat the intermediate film layer on the outer layer material with a coating thickness of 0.2 - 0.3 mm to obtain a coated layer. Cover the coated layer with a polyester mesh fabric inner layer to obtain a preliminary film material. Thermocompression laminate the preliminary film material at 130 - 140 °C and 0.5 - 0.8 MPa for 60 - 90 s to obtain a secondary film material. Cold press and shape the secondary film material at 0.5 - 0.6 MPa for 30 - 40 s to obtain a tertiary film material. Let the tertiary film material air-dry for 24 - 48 h to obtain the breathable film material for down jackets.

[0029] Example 2: This example discloses a breathable film material for down jackets, which consists of an outer layer, an intermediate film layer and an inner layer. The outer layer is nylon, the intermediate film layer includes a fullerene-castor oil modified epoxy resin composite material, a nano-silica-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0030] The outer layer comprises the following raw materials in parts by weight: 25 parts of nylon; the intermediate film layer comprises the following raw materials in parts by weight: 40 parts of fullerene-castor oil modified epoxy resin composite material, 30 parts of nano-silica-graphene modified chitosan composite material, 3 parts of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 25 parts of polyester mesh fabric.

[0031] The preparation methods of the fullerene-castor oil modified epoxy resin composite material and the nano-silica-graphene modified chitosan composite material in this example are the same as those in Example 1. The preparation method of a breathable film material for down jackets in this example is the same as that in Example 1.

[0032] Example 3: This example discloses a breathable film material for down jackets, which is composed of an outer layer, an intermediate film layer and an inner layer. The outer layer is nylon, the intermediate film layer comprises a fullerene-castor oil modified epoxy resin composite material, a nano-silica-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is polyester mesh fabric.

[0033] The outer layer comprises the following raw materials in parts by weight: 15 parts of nylon; the intermediate film layer comprises the following raw materials in parts by weight: 30 parts of fullerene-castor oil modified epoxy resin composite material, 20 parts of nano-silica-graphene modified chitosan composite material, 1 part of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 15 parts of polyester mesh fabric.

[0034] The preparation methods of the fullerene-castor oil modified epoxy resin composite material and the nano-silica-graphene modified chitosan composite material in this example are the same as those in Example 1. The preparation method of a breathable film material for down jackets in this example is the same as that in Example 1.

[0035] Example 4: This example discloses a breathable film material for down jackets, which is composed of an outer layer, an intermediate film layer and an inner layer. The outer layer is nylon, the intermediate film layer comprises a fullerene-castor oil modified epoxy resin composite material, a nano-silica-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is polyester mesh fabric.

[0036] The outer layer comprises the following raw materials in parts by weight: 20 parts of nylon; the intermediate film layer comprises the following raw materials in parts by weight: 35 parts of fullerene-castor oil modified epoxy resin composite material, 25 parts of nano-silica-graphene modified chitosan composite material, 2 parts of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 20 parts of polyester mesh fabric.

[0037] The preparation methods of the fullerene-castor oil modified epoxy resin composite material and the nano-silica-graphene modified chitosan composite material in this example are the same as those in Example 1. The preparation method of a breathable film material for down jackets in this example is the same as that in Example 1.

[0038] Control Group 1: This embodiment discloses a breathable film material for down jackets, which is composed of an outer layer, an intermediate film layer, and an inner layer. The outer layer is nylon, the intermediate film layer includes a nano-silica-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0039] The outer layer comprises the following raw materials in parts by weight: 18 parts of nylon; the intermediate film layer comprises the following raw materials in parts by weight: 26 parts of nano-silica-graphene modified chitosan composite material and 2 parts of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 18 parts of polyester mesh fabric.

[0040] The preparation method of the nano-silica-graphene modified chitosan composite material in this embodiment is the same as that in Example 1. The preparation method of a breathable film material for down jackets in this embodiment is the same as that in Example 1.

[0041] Control Group 2: This embodiment discloses a breathable film material for down jackets, which is composed of an outer layer, an intermediate film layer, and an inner layer. The outer layer is nylon, the intermediate film layer includes fullerene, nano-silica-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0042] The outer layer comprises the following raw materials in parts by weight: 18 parts of nylon; the intermediate film layer comprises the following raw materials in parts by weight: 32 parts of fullerene, 26 parts of nano-silica-graphene modified chitosan composite material and 2 parts of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 18 parts of polyester mesh fabric.

[0043] The preparation method of the fullerene and nano-silica-graphene modified chitosan composite material in this embodiment is the same as that in Example 1. The preparation method of a breathable film material for down jackets in this embodiment is the same as that in Example 1.

[0044] Control Group 3: This embodiment discloses a breathable film material for down jackets, which is composed of an outer layer, an intermediate film layer, and an inner layer. The outer layer is nylon, the intermediate film layer includes a castor oil modified epoxy resin composite material, nano-silica-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0045] The outer layer comprises the following raw materials in parts by weight: 18 parts of nylon; the intermediate film layer comprises the following raw materials in parts by weight: 32 parts of castor oil modified epoxy resin composite material, 26 parts of nano-silica-graphene modified chitosan composite material and 2 parts of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 18 parts of polyester mesh fabric.

[0046] The preparation method of the castor oil-modified epoxy resin composite material and the nano-silica-graphene-modified chitosan composite material in this example is the same as that in Example 1. The preparation method of a breathable film material for down jackets in this example is the same as that in Example 1.

[0047] Control Group 4: This example discloses a breathable film material for down jackets, which consists of an outer layer, an intermediate film layer, and an inner layer. The outer layer is nylon, the intermediate film layer includes a fullerene-castor oil-modified epoxy resin composite material and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0048] The outer layer includes the following raw materials in parts by weight: 18 parts of nylon; the intermediate film layer includes the following raw materials in parts by weight: 32 parts of fullerene-castor oil-modified epoxy resin composite material and 2 parts of liquid nitrile rubber; the inner layer includes the following raw materials in parts by weight: 18 parts of polyester mesh fabric.

[0049] The preparation method of the fullerene-castor oil-modified epoxy resin composite material in this example is the same as that in Example 1. The preparation method of a breathable film material for down jackets in this example is the same as that in Example 1.

[0050] Control Group 5: This example discloses a breathable film material for down jackets, which consists of an outer layer, an intermediate film layer, and an inner layer. The outer layer is nylon, the intermediate film layer includes a fullerene-castor oil-modified epoxy resin composite material, nano-silica, and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0051] The outer layer includes the following raw materials in parts by weight: 18 parts of nylon; the intermediate film layer includes the following raw materials in parts by weight: 32 parts of fullerene-castor oil-modified epoxy resin composite material, 26 parts of nano-silica, and 2 parts of liquid nitrile rubber; the inner layer includes the following raw materials in parts by weight: 18 parts of polyester mesh fabric.

[0052] The preparation method of the fullerene-castor oil-modified epoxy resin composite material and nano-silica in this example is the same as that in Example 1. The preparation method of a breathable film material for down jackets in this example is the same as that in Example 1.

[0053] Control Group 6: This example discloses a breathable film material for down jackets, which consists of an outer layer, an intermediate film layer, and an inner layer. The outer layer is nylon, the intermediate film layer includes a fullerene-castor oil-modified epoxy resin composite material, a graphene-modified chitosan composite material, and liquid nitrile rubber, and the inner layer is a polyester mesh fabric.

[0054] The outer layer comprises raw materials in the following parts by weight: 18 parts of nylon; the intermediate film layer comprises raw materials in the following parts by weight: 32 parts of fullerene-castor oil modified epoxy resin composite material, 26 parts of graphene modified chitosan composite material, and 2 parts of liquid nitrile rubber; the inner layer comprises raw materials in the following parts by weight: 18 parts of polyester mesh fabric.

[0055] The preparation methods of the fullerene-castor oil modified epoxy resin composite material and the graphene modified chitosan composite material in this embodiment are the same as those in Embodiment 1. The preparation method of a breathable film material for a down jacket in this embodiment is the same as that in Embodiment 1.

[0056] Test verification: 1. Air permeability test: Use an air permeability tester. The sample size is 15 cm × 15 cm, the test temperature is 20 ± 2 °C, the relative humidity is 65 ± 2%, and the test pressure difference is 100 Pa.

[0057] 2. Waterproof performance test: Use a hydrostatic pressure tester. The sample size is 20 cm × 20 cm, the test temperature is 20 ± 2 °C, the water pressure rising rate is 10 ± 0.5 cm / min, and the test is carried out until the third water droplet appears.

[0058] 3. Dynamic water vapor transmission performance test: Use a dynamic moisture resistance tester. The sample size is 10 cm × 10 cm, the test temperature is 35 °C, the relative humidity cycles from 40% to 90%, the test time is 24 h, and record the change of water vapor transmission rate at different humidities.

[0059] 4. Thermal insulation performance test: Use a thermal insulation tester. The sample size is 30 cm × 30 cm, the test hot plate temperature is 38 °C, the ambient temperature is 20 °C, and the test time is 30 min.

[0060] 5. Microstructure characterization: The pore size distribution test is carried out by the nitrogen adsorption-desorption method. The sample is evacuated at high temperature to remove the impurities adsorbed on the surface, and then placed in liquid nitrogen. Nitrogen is gradually adsorbed on the surface of the sample at low temperature to form a multi-layer adsorption film. As the temperature rises, the adsorbed nitrogen is gradually desorbed, and the pore size distribution is analyzed by measuring the desorption curve; the layer spacing test is carried out by an X-ray diffractometer. The sample is prepared into powder and then placed in the X-ray beam, and the diffraction pattern is recorded. According to the position and intensity of the diffraction peaks, the layer spacing is calculated.

[0061] 6. Others: (1) CLO value: Use a thermal resistance tester. The test temperature is 20 ± 2 °C, the relative humidity is 65 ± 2%, and the test time is 30 min; (2) Thickness: Use a digital thickness gauge. The sample size is 10 cm × 10 cm, and the test pressure is 1 kPa; (3) Weight: Use a precision electronic balance. The sample size is 100 cm 2 . Table 1 Test Results of Basic Physical Properties

[0062]

[0063] Table 2 Test Results of Dynamic Water Vapor Transmission Performance

[0064] Table 3 Test Results of Temperature Gradient (Ambient Temperature 20°C)

[0065] Table 4 Microstructural Characteristics

[0066] In terms of basic physical properties, the air permeability (7.2 - 8.8 mm / s) and hydrostatic pressure (23.4 - 27.3 kPa) of the breathable laminated materials used in the down jackets prepared in the example group are both better than those in the control group (4.9 - 6.5 mm / s and 17.2 - 20.3 kPa). This is mainly attributed to the synergistic effect of fullerene-castor oil modified epoxy resin and nano-silica-graphene modified chitosan. In particular, Example 1 shows the best performance, with an air permeability of 8.8 mm / s and an excellent hydrostatic pressure of 26.5 kPa, demonstrating an air permeability - water resistance balance. In terms of CLO value, the example group (3.2 - 3.9) shows an approximately 30% increase compared to the control group (2.5 - 3.1), indicating an improved warming effect.

[0067] The test of dynamic water vapor transmission performance shows that the water vapor transmission rate (8500 - 10500 g / m 2 ·24h) of the breathable laminated materials used in the down jackets prepared in the example group is much higher than that in the control group (5500 - 7500 g / m 2 ·24h), while the wet resistance value is significantly reduced (7.2 - 9.5 compared to 11.0 - 13.8 m 2 ·Pa / W). More notably, the example group shows better humidity responsiveness in different humidity environments, with a moisture absorption rate (11.8 - 13.2%) at 90% RH significantly higher than that in the control group (8.5 - 10.2%), indicating that the material has good humidity regulation ability.

[0068] The temperature gradient test data shows that the breathable laminated material used in the down jackets prepared in the example group formed a steeper temperature gradient (19.1 - 34.0 °C / mm), significantly higher than that of the control group (11.0 - 17.8 °C / mm), which corresponds to its higher heat retention rate (88.3 - 93.5% compared to 74.8 - 79.3%). The microscopic structure characteristics reveal the fundamental reason for the performance improvement: the example group has a smaller average pore size (42 - 52 nm) and a higher porosity (65.2 - 70.5%), while maintaining a larger specific surface area (362 - 398 m 2 / g) and a smaller layer spacing (0.82 - 0.92 nm). This optimized microstructure enables the material to achieve selective transport of water molecules and effective management of heat while maintaining the necessary mechanical strength.

[0069] Finally, it should be noted that although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A breathable film material for down clothing, characterized in that: It consists of an outer layer, an intermediate coating layer and an inner layer. The outer layer is nylon, the intermediate coating layer includes a fullerene-castor oil modified epoxy resin composite material, a nano-silicon dioxide-graphene modified chitosan composite material and liquid nitrile rubber, and the inner layer is a polyester mesh cloth.

2. The breathable film material for down clothing according to claim 1, characterized in that: The outer layer comprises the following raw materials in parts by weight: 15 to 25 parts of nylon; the middle coating layer comprises the following raw materials in parts by weight: 30 to 40 parts of fullerene-castor oil modified epoxy resin composite material, 20 to 30 parts of nano-silicon dioxide-graphene modified chitosan composite material, and 1 to 3 parts of liquid nitrile rubber; the inner layer comprises the following raw materials in parts by weight: 15 to 25 parts of polyester mesh cloth.

3. The breathable film material for down clothing according to claim 2, characterized in that: The preparation method of the fullerene-castor oil modified epoxy resin composite material comprises: S11. Fullerene-C 60 Add tetrahydrofuran and ultrasonicate for 30-40 min to obtain pretreated fullerene-C 60 Solution; S12. Castor oil was added to the epoxy resin, and then stirred at a temperature of 80 to 90 ° C and a speed of 200-300 rpm for 2 to 3 hours to obtain a castor oil-modified epoxy resin; S13. Pre-treated fullerene-C 60 The solution is slowly added to the castor oil-modified epoxy resin, and then stirred for 30 to 40 minutes to obtain a stirred mixed solution, the stirred mixed solution is ultrasonicated for 15 to 30 minutes to obtain a ultrasonicated mixed solution, the ultrasonicated mixed solution is vacuum degassed for 20 to 30 minutes to obtain a vacuum degassed mixed solution, and methyltetrahydrophthalic anhydride is added to the vacuum degassed mixed solution to obtain a mixture; S14. Apply polydimethylsiloxyalkyl alcohol on the surface of the mold to obtain a pretreated mold, pour the mixture into the pretreated mold for step-by-step curing, first keep it at 80-90°C for 2-3 hours, then keep it at 120-130°C for 2-3 hours, and finally cure it at 150-160°C for 2-3 hours to obtain a cured product, cool the cured product to room temperature, and obtain a fullerene-castor oil modified epoxy resin composite material.

4. The breathable film material for down clothing according to claim 2, characterized in that: The preparation method of the nano-silicon dioxide-graphene modified chitosan composite material comprises: S21. adding graphene oxide to deionized water, and then ultrasonicating for 50 to 60 minutes to obtain a graphene oxide dispersion; S22. chitosan was added to a 2-5 wt% acetic acid solution, and then stirred at 300-400 rpm for 4-5 h to obtain a chitosan solution; S23. The nano-silica is vacuum dried at 80-90° C. for 4-5 h to obtain pretreated nano-silica, 3-aminopropyltriethoxysilane is added to the pretreated nano-silica, and then reacted at 80-90° C. for 2-3 h to obtain reacted nano-silica, the reacted nano-silica is centrifuged at 8000-9000 rpm for 10-20 min to obtain centrifuged nano-silica, the centrifuged nano-silica is washed with ethanol for 3-4 times to obtain washed nano-silica, and the washed nano-silica is dried at 60-70° C. for 12-18 h to obtain surface-modified nano-silica; S24. The surface-modified nano-silica was added to the graphene oxide dispersion, and then ultrasonicated for 30 to 40 minutes to obtain a mixed dispersion, the mixed dispersion was slowly added dropwise to the chitosan solution, and then stirred at 300 to 400 rpm for 2 to 3 hours to obtain a solution A, the solution A was ultrasonicated for 30 to 40 minutes to obtain a solution B, glutaraldehyde solution was added to the solution B to obtain a solution C, and the solution C was stirred for 30 to 40 minutes to obtain a solution D; S25. Pour solution D into a polytetrafluoroethylene mold, and then let it stand at room temperature for 12 to 24 hours to obtain product A. Dry product A in an oven at 50 to 60°C for 24 to 36 hours to obtain product B. Soak product B in deionized water for 24 to 36 hours to obtain product C. Dry product C in a vacuum oven at 50 to 60°C for 12 to 24 hours to obtain a nano-silica-graphene modified chitosan composite material.

5. A method for preparing a breathable film material for a down jacket, which is used to prepare the breathable film material for a down jacket as claimed in any one of claims 1 to 4, characterized in that: The method comprises the following steps: S31. The nylon fabric is dried at 60 to 70 ° C for 30 to 40 minutes to obtain the dried nylon fabric, and the dried nylon fabric is naturally cooled to room temperature to obtain an outer layer material; S32. The fullerene-castor oil modified epoxy resin composite material, the nano-silica-graphene modified chitosan composite material and the liquid nitrile rubber were mixed and stirred for 30 to 40 minutes, and then vacuum degassed for 15 to 20 minutes to obtain an intermediate coating layer; S33. The middle coating layer is uniformly coated on the outer layer material with a coating thickness of 0.2~0.3mm to obtain a coating layer, and an inner layer of polyester mesh cloth is covered on the coating layer to obtain a primary coating material, and the primary coating material is hot-pressed and laminated at 130~140℃ and 0.5~0.8MPa for 60~90s to obtain a secondary coating material, and the secondary coating material is cold-pressed and fixed at 0.5~0.6MPa for 30~40s to obtain a tertiary coating material, and the tertiary coating material is naturally aired for 24~48h to obtain a breathable coating material for down jackets.

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