Lightweight and high-warmth down jacket fabric and preparation method thereof

Abstract

The present application relates to the field of fabrics, and more specifically to a lightweight, highly warm down jacket fabric and its preparation method. The lightweight, highly warm down jacket fabric comprises a fabric base as a substrate and a coating located on the surface of the fabric base, and the coating raw materials include: a main resin component, an auxiliary resin, a solvent, a functional combination agent, an antioxidant, a wetting agent, and a cross-linking agent, etc. The down jacket fabric finally prepared by the present application can not only maintain a good warming effect, but also reduce the coating thickness while improving the coating performance, maintain the lightweight effect, and further improve the aging resistance and corrosion resistance of the down jacket fabric. While reducing the use of fluorine-containing raw materials, it ensures the good moisture resistance and wear resistance of the fabric, reduces the probability of wear and peeling of the coating during long-term use, and meets the comprehensive performance requirements of existing consumers for down jacket fabrics, with significant application effects.

Description

Technical Field

[0001] The present application relates to the field of fabrics, and more specifically to a lightweight and highly warm down jacket fabric and a preparation method thereof. Background Art

[0002] With rising living standards and a growing enthusiasm for outdoor activities, demand for winter clothing is also increasing. Down jackets, particularly in colder weather, serve as the primary form of warmth, and their performance directly impacts the wearer's comfort and freedom of movement. To meet market demand for lighter, warmer, and easier-to-maintain down jackets, researchers are exploring new materials and technologies.

[0003] Traditional down jackets are typically filled with natural down and covered with various textile fabrics. However, these traditional fabrics often suffer from issues such as poor water resistance, corrosion resistance, and weather resistance, as well as moisture absorption and long drying times, which compromise the overall performance of down jackets. To address these issues, improved fabrics with coatings have gradually emerged on the market. Fabric coating processes primarily rely on blade coating or roller coating. While these coatings can improve windproofing, water resistance, and weather resistance, the thicker coatings and poorer coating quality can significantly impact fabric properties such as hardness, flexibility, and hand feel.

[0004] Therefore, although the existing technology has carried out improvement schemes such as coating modification on down jacket fabrics, it still faces many practical challenges, such as how to improve the coating performance to reduce the coating thickness and significantly improve the common properties of such fabrics such as flexibility and wear resistance; durability issues, although coated fabrics can provide additional functions such as moisture resistance or windproof, but over time, these coatings may age, and then wear or peel off, resulting in reduced functionality; although the emergence of fluorine-containing coatings has greatly improved the coating performance, especially the waterproof and moisture resistance of fabrics, at the same time, the fluorine-containing coatings are not adaptable enough and have a large environmental load, and cannot be the most preferred choice. Summary of the Invention

[0005] Therefore, in order to effectively solve the above problems, the applicant has proposed a lightweight, highly warm down jacket fabric and its preparation method. The down jacket fabric finally produced by this application not only maintains a good thermal insulation effect, but also reduces the coating thickness while improving the coating performance, maintaining the lightweight effect, and further improves the down jacket fabric's aging resistance and corrosion resistance. While reducing the use of fluorine-containing raw materials, it ensures the fabric's good moisture and wear resistance, reducing the probability of wear and peeling of the coating during long-term use, meeting the current consumer demand for the comprehensive performance of down jacket fabrics, and the application effect is significant.

[0006] A lightweight and highly warm down jacket fabric comprises a fabric base layer as a substrate and a coating located on the surface of the fabric base layer.

[0007] As a preferred solution, the fabric base layer is composed of the following raw materials in parts by mass: 100-120 parts of ultrafine fibers, 20-40 parts of modified staple fibers, and 10-15 parts of toughening agents.

[0008] As a preferred solution, the thickness of the fabric base layer is 0.06-0.1 mm.

[0009] As a preferred solution, the ultrafine fibers are ultrafine nylon fibers.

[0010] As a preferred solution, the fineness of the ultrafine nylon fiber is 15-20D.

[0011] As a preferred solution, the breaking strength of the ultrafine nylon fiber is 4.5 to 8 cN / dtex.

[0012] As a preferred solution, the modified staple fiber is graphene-modified polyester staple fiber.

[0013] As a preferred solution, the graphene content of the graphene-modified polyester staple fiber is 1 to 1.5 wt%.

[0014] As a preferred solution, the fineness of the graphene-modified polyester staple fiber is 2 to 4D.

[0015] As a preferred solution, the toughening agent is at least one of polylactic acid, polyhydroxyalkanoate and polybutylene adipate terephthalate.

[0016] As a preferred solution, the toughening agent is polylactic acid.

[0017] As a preferred solution, the mass ratio of the ultrafine fibers, modified staple fibers and toughening agent is (10-11): (2.2-3.2): (1-1.3).

[0018] As a preferred solution, the mass ratio of the ultrafine fibers, modified staple fibers and toughening agent is (10-10.5): (2.5-3): (1.1-1.2).

[0019] As a preferred solution, the coating is composed of the following raw materials, calculated by mass: 70 to 85 parts of main resin, 15 to 30 parts of auxiliary resin, 40 to 60 parts of solvent, 5 to 10 parts of functional combination agent, 1 to 1.5 parts of antioxidant, 0.5 to 1 part of wetting agent, 0.3 to 0.5 parts of defoaming agent, 1.5 to 2.5 parts of thickener, 2 to 4 parts of crosslinking agent, and 0.5 to 0.9 parts of ultraviolet absorber.

[0020] As a preferred solution, the mass ratio of the main resin, auxiliary resin and functional combination agent is (75-85): (20-30): (7-10).

[0021] As a preferred solution, the mass ratio of the main resin, auxiliary resin and functional combination agent is (78-83): (24-27): (8-9.5).

[0022] As a preferred solution, the main resin is a water-based acrylic resin.

[0023] As a preferred solution, the solid content of the water-based acrylate resin is 40-55%.

[0024] As a preferred solution, the viscosity of the water-based acrylate resin is 800-1200 mPa·s at 25°C.

[0025] As a preferred solution, the auxiliary resin is a modified waterborne polyurethane resin.

[0026] As a preferred solution, the preparation method of the modified waterborne polyurethane resin specifically includes the following steps: S1: mixing waterborne polyurethane with diethylaminoethyl acrylate, vinyl triacetoxysilane and itaconic anhydride, adding deionized water and dispersing them evenly; S2: heating and adding potassium persulfate, carrying out a constant temperature reaction under nitrogen protection and controlling the pH value of the reaction system to be acidic; S3: after the reaction is completed, preliminary cooling and stirring while keeping warm, then sieving the product and controlling the solid content of the final product, and the product is obtained.

[0027] As a preferred solution, the preparation method of the modified waterborne polyurethane resin specifically includes the following steps: S1: mixing waterborne polyurethane with diethylaminoethyl acrylate, vinyl triacetoxysilane and itaconic anhydride, and adding the mixture into deionized water for dispersion at a speed of 500-600 rpm for 15-25 minutes; S2: heating to 80-85°C, adding potassium persulfate, and reacting at a constant temperature for 5-6 hours under nitrogen protection, during which the pH value of the reaction system is controlled to 5.5-6 using dilute sulfuric acid; S3: after the reaction is completed, cooling to 40-45°C, stirring at a speed of 100-150 rpm for 0.5-1 hour, and then passing the product through a 200-300 mesh sieve to control the solid content to 30-40%.

[0028] As a preferred solution, the solid content of the waterborne polyurethane is 35-38%.

[0029] As a preferred solution, the viscosity of the waterborne polyurethane is 300-500 mPa·s at 25°C.

[0030] As a preferred solution, the mass ratio of the waterborne polyurethane, diethylaminoethyl acrylate, vinyl triacetoxysilane and itaconic anhydride is (8-11): (1.2-1.8): (0.8-1.3): (0.4-0.7).

[0031] As a preferred solution, the mass ratio of the waterborne polyurethane, diethylaminoethyl acrylate, vinyl triacetoxysilane and itaconic anhydride is (9-10): (1.5-1.7): (1-1.2): (0.4-0.5).

[0032] The addition of modified waterborne polyurethane resin can significantly improve the overall wear resistance, flexibility, and thermal insulation of down jacket fabrics, while also providing excellent waterproofing and corrosion resistance. The modified waterborne polyurethane resin works together with the main acrylic resin, providing tertiary amine groups through its branched structure with multiple active sites to impart pH buffering capacity to the coating, neutralizing acidic corrosive media. Furthermore, the silanol groups it contains form silicon-carbon covalent bonds with the polyurethane urethane bonds during the curing process, constructing a three-dimensional cross-linked network and increasing the cross-linking density through internal condensation reactions. This significantly enhances the molecular chain connectivity of the coating system, effectively addressing molecular chain slippage, providing strong slip resistance, significantly reducing the number of cracks and wear gaps, improving resistance to moisture and corrosive media, and reducing penetration efficiency.

[0033] Furthermore, the silanol groups form hydrogen bonds with the internal system raw materials, strengthening intermolecular connections and reducing abrasive peeling. Furthermore, the cross-linked network formed by the condensation reaction further reduces the coating pore size, reducing the initial penetration of corrosive ions. Ultimately, the addition of the modified waterborne polyurethane resin forms more hydrogen bonds with the acrylate, improving compound compatibility and forming a soft-hard phase structure, dispersing stress, and providing better interfacial stability and strength, thereby ensuring improved overall performance.

[0034] As a preferred solution, the solvent is deionized water.

[0035] As a preferred solution, the functional combination agent is a composition of silicon carbide microspheres, polyaniline and composite montmorillonite.

[0036] As a preferred solution, the mass ratio of the silicon carbide microspheres, polyaniline and composite montmorillonite is (3-4): (1-2): (1.5-2).

[0037] As a preferred solution, the average particle size of the silicon carbide microspheres is 4 to 8 μm.

[0038] As a preferred solution, the content of montmorillonite in the composite montmorillonite is 15-20 wt%.

[0039] As a preferred solution, the antioxidant is at least one of antioxidant 1010, antioxidant 245, antioxidant 445 and antioxidant 1790.

[0040] As a preferred solution, the antioxidant is antioxidant 245.

[0041] As a preferred solution, the wetting agent is at least one of polyether siloxanes, acetylenic alcohols, phosphates and sulfonates.

[0042] As a preferred solution, the wetting agent is polyether siloxane or acetylenic alcohol.

[0043] As a preferred solution, the defoaming agent is at least one of silicone defoaming agents.

[0044] As a preferred solution, the defoaming agent is polysiloxane BYK-022.

[0045] As a preferred solution, the thickener is at least one of sodium carboxymethyl cellulose, ammonium polyacrylate, xanthan gum and fumed silica.

[0046] As a preferred solution, the thickener is sodium carboxymethyl cellulose.

[0047] As a preferred solution, the cross-linking agent is at least one of carbodiimide, epoxysilane, aziridine and aluminum acetylacetonate.

[0048] As a preferred solution, the cross-linking agent is carbodiimide or aziridine.

[0049] As a preferred solution, the ultraviolet absorber is at least one of benzotriazoles, benzophenones, cyanoacrylates and salicylates.

[0050] As a preferred solution, the ultraviolet absorber is a benzotriazole or a benzophenone.

[0051] The preparation method of lightweight and high-warmth down jacket fabric specifically includes the following steps: S1: mixing ultrafine fibers, modified staple fibers and toughening agents evenly through an opener, with a fiber length of 30 to 40 mm and a moisture content of ≤2%, and then using a double-sided circular knitting machine for knitting, with a warp and weft density of 380T, a setting temperature of 160 to 180°C for 30 to 35 seconds, and a pressure of 0.8 to 0.9 MPa to obtain a fabric base layer; S2: mixing the main resin, auxiliary resin and functional combination agent into a solvent, heating to 40 to 45°C and stirring until uniform, then add the remaining raw materials in sequence, stirring at a high speed of 1000-1500 rpm for 20-30 minutes each time, heating to 55-60 ° C and keeping warm for 3-4 hours after completion, and then passing through a 200-300 mesh sieve; S3: Use a micro-gravure coater to coat the fabric base layer, the coating wet film thickness is 20-25 μm, pre-bake at 80-85 ° C for 3-4 minutes, then cure at 130-140 ° C for 2-3 minutes, the pressure roller is 0.5-0.6 MPa, and cool and roll up.

[0052] This application has the following beneficial effects:

[0053] 1. The lightweight and highly warm down jacket fabric finally produced by this application can not only maintain a good warming effect, but also reduce the coating thickness while improving the coating performance and maintaining the lightweight effect, and can further improve the aging resistance and corrosion resistance of the down jacket fabric. While reducing the application of fluorine-containing raw materials, it ensures the good moisture resistance and wear resistance of the fabric, reduces the probability of wear and peeling of the coating during long-term use, meets the comprehensive performance requirements of existing consumers for down jacket fabrics, and has a significant application effect.

[0054] 2. The lightweight and highly warm down jacket fabric finally obtained by the present application can greatly improve the overall wear resistance, flexibility and thermal insulation effect of the down jacket fabric by adding modified water-based polyurethane resin, and can also have excellent waterproof and anti-corrosion functions; the modified water-based polyurethane resin works together with the main acrylic resin to provide tertiary amine groups through the branched structure with multiple active sites to give the coating pH buffering ability, neutralize acidic corrosive media, and the silanol groups it contains form silicon-carbon covalent bonds with polyurethane urethane bonds during the curing process, constructing a three-dimensional cross-linked network and increasing the cross-linking density through internal condensation reactions, greatly enhancing the molecular chain connectivity of the coating system, thereby being able to effectively cope with molecular chain slippage, having strong slip resistance, and greatly reducing the number of cracks and wear gaps.

[0055] 3. The lightweight, highly thermal down jacket fabric ultimately produced by this application incorporates a modified waterborne polyurethane resin whose silanol groups form hydrogen bonds with the internal system raw materials, strengthening intermolecular connections and reducing abrasive peeling. Furthermore, the cross-linked network formed by the condensation reaction further reduces the pore size of the coating, reducing the initial penetration of corrosive ions. Ultimately, the addition of the modified waterborne polyurethane resin forms more hydrogen bonds with the acrylate, resulting in better compatibility in the composite, forming a soft-hard interphase structure, dispersing stress, and providing better interfacial stability and strength, thereby ensuring improved overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a surface diagram of the lightweight and highly warm down jacket fabric prepared in Example 1 of the present application.

[0057] Figure 2 This is a surface diagram of the lightweight and highly warm down jacket fabric prepared in Example 2 of this application. DETAILED DESCRIPTION

[0058] Example 1

[0059] A lightweight and highly warm down jacket fabric comprises a fabric base layer as a base and a coating located on the surface of the fabric base layer.

[0060] The base fabric material is composed of the following ingredients by weight: 105 parts of microfiber, 28 parts of modified staple fiber, and 12 parts of toughening agent.

[0061] The thickness of the fabric base layer is 0.08mm.

[0062] The ultrafine fiber is an ultrafine nylon fiber with a fineness of 20D and a breaking strength of 4.5 to 8 cN / dtex, and is purchased from a 20D ultrafine nylon fiber product sold by Toray Industries, Japan.

[0063] The modified staple fiber is a graphene-modified polyester staple fiber with a graphene content of 1.5wt% and a fineness of 3D. It is a T-200GR model product purchased from Hyosung Corporation of South Korea.

[0064] The toughening agent is polylactic acid toughening agent, which was purchased from Shengli New Materials Co., Ltd. in Dongguan City, China.

[0065] The coating is composed of the following raw materials in parts by mass: 80 parts of main resin, 25 parts of auxiliary resin, 45 parts of solvent, 8.8 parts of functional combination agent, 1.2 parts of antioxidant, 0.8 parts of wetting agent, 0.4 parts of defoaming agent, 2.3 parts of thickener, 2.6 parts of crosslinking agent, and 0.6 parts of ultraviolet absorber.

[0066] The solvent is deionized water.

[0067] The main resin is a water-based acrylic resin with a solid content of 45%, a viscosity of 1000 mPa·s, and a temperature of 25° C., purchased from Mitsubishi Chemical Corporation of Japan.

[0068] The auxiliary resin is a modified waterborne polyurethane resin, and the preparation method specifically includes the following steps, calculated by mass: S1: mixing 9.5 parts of waterborne polyurethane with 1.6 parts of diethylaminoethyl acrylate, 1.1 parts of vinyltriacetoxysilane and 0.4 parts of itaconic anhydride, and adding the mixture into 20 parts of deionized water and dispersing at 500 rpm for 20 minutes; S2: heating to 85°C, adding 0.1 parts of potassium persulfate, and reacting at a constant temperature for 5 hours under nitrogen protection, during which the pH value of the reaction system is controlled to 6 using dilute sulfuric acid; S3: after the reaction is completed, cooling to 45°C, stirring at a speed of 120 rpm for 1 hour, and then passing the product through a 300-mesh sieve to control the solid content to 35±2%.

[0069] The waterborne polyurethane had a solid content of 36%, a viscosity of 400 mPa·s, and was purchased from Covestro, Germany, at 25°C.

[0070] The functional composite agent is a composition of silicon carbide microspheres, polyaniline and composite montmorillonite, with a mass ratio of 3.5:1.2:1.8.

[0071] Polyaniline was purchased as a water-soluble analytical grade product from Wuhan Huaxiang Kejie Biotechnology Co., Ltd., China.

[0072] The average particle size of silicon carbide microspheres was 7.5 μm and they were purchased from Showa Denko Co., Ltd., Japan.

[0073] The content of montmorillonite in the composite montmorillonite is 15 wt %, and the montmorillonite is a PZS / MMT-15 product purchased from Dow Chemical Company of the United States.

[0074] The wetting agent is polyether siloxane BYK-349; the defoaming agent is polysiloxane BYK-022; the thickener is sodium carboxymethyl cellulose; the crosslinking agent is carbodiimide; and the UV absorber is benzotriazole Tinuvin 328.

[0075] The preparation method of lightweight and high-warmth down jacket fabric specifically includes the following steps: S1: ultrafine fiber, modified staple fiber and toughening agent are evenly mixed through an opener, the fiber length is 35 mm, and the moisture content is controlled to be ≤2%, and then a double-sided circular machine is used for weaving and shaping, the warp and weft density is 380T, the shaping temperature is 180℃×35s, and the pressure is 0.8MPa to obtain a fabric base layer; S2: the main resin, auxiliary resin and functional combination agent are mixed and added to a solvent, heated to 45℃ and stirred until uniform, and then the remaining raw materials are added in sequence, and each addition is stirred at a high speed of 1200rpm for 25min. After completion, the temperature is raised to 60℃ and kept warm for 4h, and then passed through a 300-mesh sieve; S3: the fabric base layer is coated with a micro-gravure coater, the coating wet film thickness is 25μm, pre-baked at 80℃ for 3min, and then cured at 140℃ for 2min. The pressure roller is 0.5MPa, and the fabric is cooled and rolled up.

[0076] Example 2

[0077] The only difference between this embodiment and embodiment 1 is as follows:

[0078] The coating is composed of the following raw materials in parts by mass: 85 parts of main resin, 20 parts of auxiliary resin, 45 parts of solvent, 7.2 parts of functional combination agent, 1.2 parts of antioxidant, 0.8 parts of wetting agent, 0.4 parts of defoaming agent, 2.3 parts of thickener, 2.6 parts of crosslinking agent, and 0.6 parts of ultraviolet absorber.

[0079] Example 3

[0080] The only difference between this embodiment and embodiment 1 is as follows:

[0081] The coating is composed of the following raw materials in parts by mass: 78 parts of main resin, 30 parts of auxiliary resin, 45 parts of solvent, 9.2 parts of functional combination agent, 1.2 parts of antioxidant, 0.8 parts of wetting agent, 0.4 parts of defoaming agent, 2.3 parts of thickener, 2.6 parts of crosslinking agent, and 0.6 parts of ultraviolet absorber.

[0082] Comparative Example 1

[0083] This comparative example differs from Example 1 only in the following ways:

[0084] The coating is calculated in parts by mass, and the raw materials consist of the following components: silicon carbide microspheres with an average particle size of 13.5 μm, purchased from Showa Denko Co., Ltd. of Japan.

[0085] Comparative Example 2

[0086] This comparative example differs from Example 1 only in the following ways:

[0087] The coating is composed of the following raw materials in parts by mass: 80 parts of main resin, 25 parts of auxiliary resin, 45 parts of solvent, 2 parts of functional combination agent, 1.2 parts of antioxidant, 0.8 parts of wetting agent, 0.4 parts of defoaming agent, 2.3 parts of thickener, 2.6 parts of crosslinking agent, and 0.6 parts of ultraviolet absorber.

[0088] Comparative Example 3

[0089] This comparative example differs from Example 1 only in the following ways:

[0090] The coating is composed of the following raw materials in parts by mass: 100 parts of main resin, 10 parts of auxiliary resin, 45 parts of solvent, 8.8 parts of functional combination agent, 1.2 parts of antioxidant, 0.8 parts of wetting agent, 0.4 parts of defoaming agent, 2.3 parts of thickener, 2.6 parts of crosslinking agent, and 0.6 parts of ultraviolet absorber.

[0091] Comparative Example 4

[0092] This comparative example differs from Example 1 only in the following ways:

[0093] The auxiliary resin is a modified waterborne polyurethane resin, and the preparation method specifically includes the following steps, calculated by mass: S1: mixing 15.5 parts of waterborne polyurethane with 0.8 parts of diethylaminoethyl acrylate, 0.2 parts of vinyltriacetoxysilane and 0.8 parts of itaconic anhydride, and adding the mixture into 20 parts of deionized water and dispersing at 500 rpm for 20 minutes; S2: heating to 85°C, adding 0.1 parts of potassium persulfate, and reacting at a constant temperature for 5 hours under nitrogen protection, during which the pH value of the reaction system is controlled to 6 using dilute sulfuric acid; S3: after the reaction is completed, cooling to 45°C, stirring at a speed of 120 rpm for 1 hour, and then passing the product through a 300-mesh sieve to control the solid content to 35±2%.

[0094] Comparative Example 5

[0095] This comparative example differs from Example 1 only in the following ways:

[0096] The auxiliary resin is a modified waterborne polyurethane resin, and the preparation method specifically includes the following steps, calculated by mass: S1: mixing 5.5 parts of waterborne polyurethane with 2.5 parts of diethylaminoethyl acrylate, 1.5 parts of vinyltriacetoxysilane and 0.1 part of itaconic anhydride, and adding the mixture into 20 parts of deionized water and dispersing at 500 rpm for 20 minutes; S2: heating to 85°C, adding 0.1 parts of potassium persulfate, and reacting at a constant temperature for 5 hours under nitrogen protection, during which the pH value of the reaction system is controlled to 6 using dilute sulfuric acid; S3: after the reaction is completed, cooling to 45°C, stirring at a speed of 120 rpm for 1 hour, and then passing the product through a 300-mesh sieve to control the solid content to 35±2%.

[0097] Comparative Example 6

[0098] This comparative example differs from Example 1 only in the following ways:

[0099] The functional composite agent is a composition of silicon carbide microspheres, polyaniline and composite montmorillonite, with a mass ratio of 1:3:1.8.

[0100] Performance Testing

[0101] 1. Waterproofness: The sessile drop method was used for testing. The fabric was cut into 2cm×2cm specimens and subjected to the sessile drop test with a 3μL water droplet. The test lasted 180s in an environment with a relative humidity of 50% and a temperature of 25°C. The water contact angle at 180s was measured. The results of 10 tests were averaged and recorded in Table 1.

[0102] 2. Corrosion resistance: Cut the fabric into 2cm×2cm specimens and spray them with 5% NaCl solution at 35±2℃ for 240 hours. Observe the blistering area and shedding phenomenon of the fabric after the test. The results are recorded in Table 1.

[0103] 3. Thermal insulation: Reference standard GB / T 11048-2008, test equipment is a flat-plate thermal insulation instrument, hot plate temperature: 35.0±0.1℃, cold plate temperature: 15.0±0.1℃, temperature sensor accuracy: ±0.1℃, test results of thermal resistance value, the result of 10 tests are recorded in Table 1.

[0104] 4. Abrasion resistance: Abrasion resistance testing was performed according to ASTM D4060, using a CS-10 grinding wheel, a 500 g load, and 1000 revolutions. Sample preconditioning was 23 ± 2°C constant temperature and humidity for 24 hours. The average of 10 tests was recorded in Table 1.

[0105] Table 1 Performance test results of embodiments and comparative examples

[0106]

[0107] Judging from the final performance test results of the Examples and Comparative Examples, Comparative Examples 1-6 achieved worse performance results compared to the Examples. The Examples, however, employed a superior technical solution, producing a better modified resin that works in conjunction with the functional combination agent. The modified waterborne polyurethane resin's silanol groups form hydrogen bonds with the internal system raw materials, strengthening intermolecular connections and reducing abrasive peeling. Furthermore, the cross-linked network formed by the condensation reaction further reduces the pore size of the coating, reducing the initial penetration of corrosive ions. Ultimately, the addition of the modified waterborne polyurethane resin forms more hydrogen bonds with the acrylate, resulting in better compatibility in the composite, forming a soft-hard phase structure, dispersing stress, and providing better interfacial stability and strength, thereby ensuring improved overall performance.

Claims

1. A lightweight and highly warm down jacket fabric, characterized by: It includes a fabric base as a substrate and a coating located on the surface of the fabric base, calculated in parts by mass: The base material of the fabric is: 100-120 parts of ultrafine fiber, 20-40 parts of modified staple fiber, and 10-15 parts of toughening agent; The coating raw materials include: 70-85 parts of main resin, 15-30 parts of auxiliary resin, 40-60 parts of solvent, 5-10 parts of functional combination agent, and 2-4 parts of cross-linking agent; The main resin is a water-based acrylic resin; the auxiliary resin is a modified water-based polyurethane resin, and the preparation method specifically comprises the following steps: S1: mixing water-based polyurethane with diethylaminoethyl acrylate, vinyl triacetoxysilane and itaconic anhydride, adding deionized water and dispersing them uniformly; S2: heating and adding potassium persulfate, and reacting at a constant temperature; S3: after the reaction is completed, sieving the product to control the solid content of the final product, and the product is obtained. The mass ratio of the waterborne polyurethane, diethylaminoethyl acrylate, vinyl triacetoxysilane and itaconic anhydride is (8-11): (1.2-1.8): (0.8-1.3): (0.4-0.7); The ultrafine fiber is an ultrafine nylon fiber with a fineness of 15-20D and a breaking strength of 4.5-8 cN / dtex; The modified staple fiber is a graphene-modified polyester staple fiber with a graphene content of 1-1.5 wt% and a fineness of 2-4D; The functional composite agent is a composition of silicon carbide microspheres, polyaniline and composite montmorillonite, with a mass ratio of (3-4): (1-2): (1.5-2).

2. The lightweight and highly warm down jacket fabric according to claim 1, characterized in that: The mass ratio of the ultrafine fiber, the modified staple fiber and the toughening agent is (10-11): (2.2-3.2): (1-1.3).

3. The lightweight and highly warm down jacket fabric according to claim 2, characterized in that: The mass ratio of the main resin, the auxiliary resin and the functional combination agent is (75-85): (20-30): (7-10).

4. The lightweight and highly warm down jacket fabric according to claim 3, characterized in that: The main resin is a water-based acrylic resin with a solid content of 40-55%, a viscosity of 800-1200 mPa·s, and a temperature of 25°C.

5. The lightweight and highly warm down jacket fabric according to claim 4, characterized in that: The average particle size of the silicon carbide microspheres is 4-8 μm.

6. The lightweight and highly warm down jacket fabric according to claim 5, characterized in that: Calculated by mass, the coating raw material further includes: 1 to 1.5 parts of antioxidant, 0.5 to 1 part of wetting agent, 0.3 to 0.5 part of defoaming agent, 1.5 to 2.5 parts of thickener, and 0.5 to 0.9 part of ultraviolet absorber.

7. A method for preparing the lightweight and highly warm down jacket fabric according to claim 6, characterized in that: The specific steps include: S1: The microfiber, modified staple fiber and toughening agent are mixed evenly through an opener. The fiber length is 30-40 mm and the moisture content is controlled to be ≤2%. Then, a double-sided circular knitting machine is used for weaving. The warp and weft density is 380T, the setting temperature is 160-180℃×30-35s, and the pressure is 0.8-0.9 MPa to obtain the fabric base layer; S2: the main resin, auxiliary resin and functional combination agent are mixed and added to the solvent, heated to 40~45℃ and stirred until uniform, and then the remaining raw materials are added in sequence, and each addition is stirred at a high speed of 1000~1500rpm for 20~30min. After completion, the temperature is raised to 55~60℃ and kept warm for 3~4h, and then passed through a 200~300 mesh sieve; S3: a micro-gravure coater is used to coat the fabric base layer, the coating wet film thickness is 20~25μm, pre-baked at 80~85℃ for 3~4min, and then cured at 130~140℃ for 2~3min. The pressure roller is 0.5~0.6MPa, and the fabric is cooled and rolled up.

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