Outdoor sports windproof and waterproof fabric and preparation method thereof

Abstract

This invention discloses an outdoor sports windproof and waterproof fabric and its preparation method in the field of fabric technology. The outdoor sports windproof and waterproof fabric includes two single-layer fabrics, a polylactic acid-glycolic acid copolymer-based porous membrane laminated between the two single-layer fabrics, and a waterproof and reinforcing coating formed by coating the outer surface of the two single-layer fabrics with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion. This outdoor sports windproof and waterproof fabric can achieve intelligent switching between room temperature dense protection and body temperature breathability and moisture permeability. Its comprehensive performance is superior to traditional fabrics and commercially available PU coated products. It is green, environmentally friendly, stable and durable, and suitable for use in various outdoor sports scenarios.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to an outdoor sports windproof and waterproof fabric and its preparation method. Background Technology

[0002] Outdoor sports windproof and waterproof fabrics are the core materials for outdoor clothing, mountaineering equipment and functional protective clothing. They are required to have comprehensive properties such as waterproof, windproof, breathable and moisture-permeable to cope with the needs of changing climate and long-term sports wear. Currently, polyurethane coatings or microporous membrane composite structures are mostly used to meet the waterproof requirements of outdoor sports waterproof fabrics. However, there are prominent problems such as difficulty in balancing waterproof and breathable and moisture-permeable properties, poor temperature sensitivity response and insufficient environmental friendliness. Traditional dense waterproof coatings, while offering high water pressure resistance, suffer from poor breathability, making it difficult for sweat to escape quickly and resulting in a stuffy and sticky feeling. Microporous membrane materials, although improving breathability, have drawbacks such as uneven pore size, poor connectivity, insufficient mechanical strength, and low water pressure resistance. Commercially available conventional polyurethane emulsions lack temperature response characteristics and cannot adaptively adjust their breathability and moisture permeability according to body surface temperature, leading to stuffiness even after exercise and difficulty in maintaining a dense waterproof layer when at rest. Furthermore, the weak bonding and poor stability between the membrane layer and the fabric further limit the overall lifespan and applicability of the fabric. Summary of the Invention

[0003] The purpose of this invention is to provide an outdoor sports windproof and waterproof fabric and its preparation method in order to solve the problems of the prior art.

[0004] The present invention achieves the above objectives through the following technical solutions: As a first aspect of the present invention, an outdoor sports windproof and waterproof fabric is provided, comprising two single-piece fabrics, a polylactic acid-hydroxyacetic acid copolymer-based porous membrane composited between the two single-piece fabrics, and a waterproof reinforcing coating formed by coating the outer surface of the two single-piece fabrics with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion. The nano-TiO2 modified waterborne thermosensitive polyurethane emulsion is prepared by reacting a mixture of bio-based castor oil, polypropylene glycol, and polytetrahydrofuran ether glycol as soft segments, after dehydration with hard segments of bio-based pentanediamine diisocyanate to prepare a prepolymer. Subsequently, dimethylolpropionic acid, 1,4-butanediol, and tetrabutyl titanate are added sequentially for chain extension and modification. After neutralization with triethylamine, it is dispersed in water to obtain the emulsion.

[0005] As a further technical solution of the present invention, in step (3), the fiber composition of the single piece of fabric, by mass percentage, is 100% polyester, 100% nylon, 90% nylon and 10% spandex, 90% polyester and 10% spandex or 30% cotton and 70% nylon.

[0006] As a first aspect of the present invention, a method for preparing an outdoor sports windproof and waterproof fabric is provided, comprising the following steps: (1) Dissolve polylactic acid-glycolic acid copolymer in dichloromethane solvent to obtain casting solution, drop the casting solution onto the substrate to cast a film, and wait for the solvent to evaporate; then obtain polylactic acid-glycolic acid copolymer based porous membrane, and remove residual solvent by vacuum drying; (2) Bio-based castor oil, polypropylene glycol and polytetrahydrofuran ether glycol are mixed and dehydrated under vacuum. Then, under the protection of catalyst and nitrogen, they are reacted with bio-based pentanediamine diisocyanate in a butanone system to prepare a prepolymer with terminal isocyanate groups. Subsequently, dimethylolpropionic acid, 1,4-butanediol and tetrabutyl titanate are added in sequence for chain extension and modification. After neutralization with triethylamine, the mixture is dispersed in water to obtain nano-TiO2 modified waterborne thermosensitive polyurethane emulsion. (3) After thickening the nano-TiO2 modified waterborne thermosensitive polyurethane emulsion, it is evenly coated on one side of a single piece of fabric and baked for later use. (4) Take two single fabric pieces coated with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion in step (3), coat the uncoated side of the two fabric pieces with hot melt adhesive, and place the polylactic acid-hydroxyacetic acid copolymer-based porous membrane prepared in step (1) between the two single fabric pieces coated with hot melt adhesive. After hot pressing and cooling shaping treatment, outdoor sports windproof and waterproof fabric is obtained.

[0007] As a further technical solution of the present invention, in step (1), the concentration of the casting solution is 2-5 wt%.

[0008] As a further technical solution of the present invention, in step (1), the casting liquid is dripped onto the substrate to form a film under an environment with a temperature of 3035 ℃ and a relative humidity of 5080%, and the substrate is placed in a sealed space. A saturated aqueous solution of sodium chloride is added to maintain the humidity in the sealed space at 7580%. After the solvent evaporates, a polylactic acid-hydroxyacetic acid copolymer-based porous membrane is obtained.

[0009] As a further technical solution of the present invention, in step (2), the mass ratio of the bio-based castor oil, polypropylene glycol and polytetrahydrofuran ether glycol is 2-3:3-4:3-4.

[0010] As a further technical solution of the present invention, in step (2), the total amount of the catalyst accounts for 0.04-0.055% of the total mass of polypropylene glycol and polytetrahydrofuran ether glycol; The amount of methyl ethyl ketone used accounts for 80-90% of the total mass of polypropylene glycol and polytetrahydrofuran ether glycol; The amount of the bio-based pentanediamine diisocyanate used is calculated based on an NCO / OH molar ratio of 1.2-1.5.

[0011] As a further technical solution of the present invention, in step (2), the amount of dimethylolpropionic acid accounts for 5-6% of the mass of the isocyanate-terminated prepolymer; The amount of 1,4-butanediol used accounts for 5-6% of the mass of the isocyanate-terminated prepolymer; The tetrabutyl titanate accounts for 0.1-0.5% of the mass of the isocyanate-terminated prepolymer; The triethylamine-terminated isocyanate group of the prepolymer is 5-6% of its mass.

[0012] As a further technical solution of the present invention, in step (3), the coating thickness of the nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion on one side of the single fabric is 100-200 μm.

[0013] The beneficial effects of this invention are as follows: The outdoor sports windproof and waterproof fabric provided by the present invention is formed by compositing two single fabrics with a polylactic acid-glycolic acid copolymer-based porous membrane, and coating the outside of the two single fabrics with a nano-TiO2 modified bio-based thermosensitive polyurethane as a functional coating. The polylactic acid-glycolic acid copolymer-based porous membrane features micropores that are hydrophobic, maintaining high water pressure resistance without sacrificing breathability. It provides a continuous and stable water vapor channel. Combined with bio-based temperature-sensitive polyurethane, its breathability and moisture permeability are significantly better than ordinary PU-coated fabrics. It does not feel stuffy during long-term exercise and can intelligently switch between room temperature dense protection and body temperature breathability and moisture permeability. Its overall performance is superior to traditional fabrics and commercially available PU-coated products. It is green, environmentally friendly, stable and durable, and suitable for various outdoor sports scenarios. Detailed Implementation

[0014] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above content.

[0015] The present invention achieves the following technical solution through at least one embodiment: This invention provides a method for preparing an outdoor sports windproof and waterproof fabric, comprising the following steps: (1) Preparation of polylactic acid-glycolic acid copolymer-based porous membrane Polylactic acid-glycolic acid copolymer was dissolved in dichloromethane to obtain a casting solution with a concentration of 25 wt%. The casting solution was dripped onto a substrate to form a film at a temperature of 30-35 ℃ and a relative humidity of 50-80%. The substrate was placed in a sealed space, and a saturated sodium chloride aqueous solution was added to maintain the humidity in the sealed space at 75-80%. After the solvent evaporated, a polylactic acid-glycolic acid copolymer-based porous membrane was obtained. The polylactic acid-glycolic acid copolymer-based porous membrane was vacuum dried at 50-55 ℃ for 90 min to remove residual solvent. The thickness of the polylactic acid-glycolic acid copolymer-based porous membrane was controlled to be 500-1000 μm. (2) Preparation of nano-TiO2 modified waterborne thermosensitive polyurethane emulsion Bio-based castor oil, polypropylene glycol, and polytetrahydrofuran ether glycol (polypropylene glycol and polytetrahydrofuran ether glycol are collectively referred to as polyethers) are mixed in a mass ratio of 2-3:3-4:3-4 to obtain a mixed solution; Add 0.02-0.025% (by mass of polyether) of dibutyltin dilaurate catalyst to the mixed solution, heat to 120-130 °C, and remove water under vacuum for 2-4 h; cool to 70-80 °C, release the vacuum, add nitrogen protection, add 80-90% (by mass of polyether) of methyl ethyl ketone (MEK) and bio-based pentanediamine diisocyanate (based on an NCO / OH molar ratio of 1.2-1.5), and react for 1-1.5 h; add 0.02-0.03% (by mass of polyether) of dibutyltin dilaurate catalyst, and continue stirring for 1-1.5 h to generate isocyanate-terminated prepolymer; Add 5-6% by weight of dimethylolpropionic acid and 5-6% by weight of 1,4-butanediol to the prepolymer sequentially. After reacting for 1-2 h, add 0.1-0.5% by weight of tetrabutyl titanate and react for 2-3 h. Then, cool the mixture to 50-55 ℃ and add 5-6% by weight of triethylamine. Continue reacting for 0.5-1 h, then add distilled water and stir at high speed for 15-20 min to obtain nano-TiO2 modified waterborne thermosensitive polyurethane emulsion.

[0016] (3) Coating of nano-TiO2 modified waterborne thermosensitive polyurethane emulsion Add 1-2% by mass of thickener (hydroxyethyl cellulose) to the nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion, then coat it evenly on one side of a single piece of fabric, and then bake it at 150-160℃ for 1-2 minutes. The coating thickness of the nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion is 100-200μm. In this invention, the fiber composition of the single piece of fabric (by mass percentage) can be selected as 100% polyester, 100% nylon, 90% nylon and 10% spandex, 90% polyester and 10% spandex, 30% cotton and 70% nylon, etc.

[0017] (4) Preparation of windproof and waterproof fabrics for outdoor sports Two single-piece fabrics coated with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion in step (3) are taken. Hot melt adhesive is applied to the uncoated side of both fabrics. The thickness of the hot melt adhesive is 50-100 μm. A polylactic acid-glycolic acid copolymer-based porous membrane is laid flat between the two single-piece fabrics with the hot melt adhesive applied. After hot pressing and cooling shaping treatment, an outdoor sports windproof and waterproof fabric is obtained. The hot pressing and cooling shaping treatment involved in the laminated fabric is a well-known technology in the art. This invention has not made any improvements to this, so it will not be described in detail.

[0018] Polylactic acid-glycolic acid copolymer (PLGA), CAS number 34346-01-5, the molar percentage (mol%) of the two monomers lactic acid and glycolic acid in the polylactic acid-glycolic acid copolymer is 75:25; Polypropylene glycol has a molecular weight of 1000; polytetrahydrofuran ether glycol has a molecular weight of 2000. In the following examples, unless otherwise specified, all methods can be performed using conventional methods, and the materials and reagents used can be obtained commercially unless otherwise specified.

[0019] 1. Preparation of windproof and waterproof fabrics for outdoor sports (1) Preparation of polylactic acid-glycolic acid copolymer-based porous membrane Polylactic acid-glycolic acid copolymer (PLA-glycolic acid copolymer) was dissolved in dichloromethane to obtain a casting solution with a concentration of 5 wt%. The casting solution was dripped onto a substrate at a temperature of 35 ℃ and a relative humidity of 50% to form a film. The substrate was placed in a sealed space, and a saturated aqueous solution of NaCl was added to the sealed space to maintain a relative humidity of 75%. After the solvent evaporated, a PLA-glycolic acid copolymer-based porous membrane was obtained. The PLA-glycolic acid copolymer-based porous membrane was vacuum dried at 50 ℃ for 90 min to remove residual solvent. The thickness of the PLA-glycolic acid copolymer-based porous membrane was controlled to be 1000 μm.

[0020] (2) Preparation of nano-TiO2 modified waterborne thermosensitive polyurethane emulsion Bio-based castor oil, polypropylene glycol, and polytetrahydrofuran ether glycol (polypropylene glycol and polytetrahydrofuran ether glycol are collectively referred to as polyethers) are mixed in a mass ratio of 2:4:4 to obtain a mixed solution; Add 0.025% (by mass of polyether) of dibutyltin dilaurate catalyst to the mixed solution, heat to 130 °C, and remove water under vacuum for 2 h; cool to 70 °C, release the vacuum, add nitrogen protection, add 80% (by mass of polyether) of methyl ethyl ketone and bio-based pentanediamine diisocyanate (based on an NCO / OH molar ratio of 1.2), and react for 1 h; add 0.02% (by mass of polyether) of dibutyltin dilaurate catalyst, and continue stirring for 1.5 h to generate isocyanate-terminated prepolymer; Dimethylolpropionic acid (5% by weight) and 1,4-butanediol (5% by weight) were added sequentially to the prepolymer. After reacting for 1 h, tetrabutyl titanate (0.3% by weight) was added. After reacting for 2 h, the temperature was lowered to 50 °C, and triethylamine (5% by weight) was added. The reaction was continued for 0.5 h, and then distilled water was added and stirred at high speed for 15 min to obtain nano-TiO2 modified waterborne thermosensitive polyurethane emulsion.

[0021] (3) Coating of nano-TiO2 modified waterborne thermosensitive polyurethane emulsion Add 1% by mass of thickener (hydroxyethyl cellulose) to the nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion, then coat it evenly on one side of a single piece of fabric, and bake it at 160 ℃ for 1 min. The coating thickness of the nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion is 100 μm. Here, the fiber composition of the single piece of fabric (by mass percentage) is 90% polyester and 10% spandex.

[0022] (4) Preparation of windproof and waterproof fabrics for outdoor sports Take two single fabric pieces coated with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion in step (3), apply hot melt adhesive to the uncoated side of both fabric pieces, with a coating thickness of 50 μm, and place a polylactic acid-hydroxyacetic acid copolymer-based porous membrane between the two single fabric pieces coated with hot melt adhesive. After hot pressing and cooling shaping treatment, outdoor sports windproof and waterproof fabric is obtained.

[0023] 2. Verification Experiment First, in order to verify the effect of the preparation of polylactic acid-glycolic acid copolymer-based porous membrane on the fabric performance, the polylactic acid-glycolic acid copolymer-based porous membrane obtained according to the preparation of polylactic acid-glycolic acid copolymer-based porous membrane in Section 1-(1) above is denoted as membrane sample M-1, and the outdoor sports waterproof and windproof fabric prepared by steps (1)-(4) in Section 1 is denoted as fabric A-1. The polylactic acid-hydroxyacetic acid copolymer used in membrane sample M-1 is replaced with polylactic acid, and the resulting polylactic acid-based porous membrane is denoted as membrane sample M-2. The outdoor sports waterproof and windproof fabric prepared by using membrane sample M-2 as material and through steps (1)-(4) in Section 1 is denoted as fabric A-2. In addition, in step (4) of section 1, two single fabrics coated with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion in step (3) are taken, and hot melt adhesive is coated on the uncoated side of the two fabrics. The thickness of the hot melt adhesive coating is 50 μm. The setting of polylactic acid-glycolic acid copolymer-based porous membrane is omitted. The two single fabrics coated with hot melt adhesive are directly overlapped. After hot pressing and cooling shaping treatment, the fabric is obtained. This fabric is referred to as fabric A-3.

[0024] Secondly, in order to verify the influence of the composition of nano-TiO2 modified waterborne thermo-sensitive polyurethane emulsion on the fabric performance, the nano-TiO2 modified waterborne thermo-sensitive polyurethane emulsion obtained in accordance with "Section 1-(2) Preparation of nano-TiO2 modified waterborne thermo-sensitive polyurethane emulsion" is denoted as emulsion Y-1. Adjust the mass ratio of the mixed soft segments used in emulsion Y-1, that is, the mass ratio between bio-based castor oil, polypropylene glycol and polytetrahydrofuran ether glycol is 2:3:4, 3:3:3 and 3:3:4 respectively. The obtained nano-TiO2 modified waterborne thermosensitive polyurethane emulsions are denoted as emulsions Y-2, Y-3 and Y-4. The outdoor sports waterproof and windproof fabrics prepared by using emulsions Y-2, Y-3 and Y-4 as materials and through steps (1)-(4) in Section 1 are denoted as fabrics A-4, A-5 and A-6. In addition, the nano-TiO2 modified waterborne thermosensitive polyurethane emulsion prepared by omitting bio-based castor oil is denoted as emulsion Y-5. The outdoor sports waterproof and windproof fabrics prepared by using emulsion Y-5 as material and going through steps (1)-(4) in Section 1 are denoted as fabric A-7. In addition, in step (3) of Section 1, commercially available polyurethane emulsion (Guangzhou Ruilin New Materials, item number 20240983) is used instead of emulsion Y-1, and the prepared outdoor sports waterproof and windproof fabric is referred to as fabric A-8. Finally, steps (1)-(3) of Section 1 are omitted. Hot melt adhesive is directly applied to one side of the two single fabric pieces. The thickness of the hot melt adhesive is 50 μm. Then, the two single fabric pieces coated with hot melt adhesive are overlapped. After hot pressing and cooling shaping, the fabric is obtained. This fabric is referred to as fabric A-9. The fiber composition and specifications of the single fabric pieces are consistent with those of fabrics A-1 to A-8.

[0025] 3. Performance Testing The following performance tests were performed on fabrics A-1 to A-9: (1) Waterproof performance test Waterproof performance was characterized by hydrostatic pressure resistance. Specifically, a YG825E-20 digital water permeability tester was used to test the hydrostatic pressure of coated fabrics according to the standard "Test and Evaluation of Waterproof Performance of Textiles - Hydrostatic Pressure Method" (GB / T 4744-2013). Each group of fabric samples was pressurized at a pressurization rate of 6 kPa / min, and the hydrostatic pressure value corresponding to the appearance of the third water droplet on the fabric surface was recorded as the hydrostatic pressure resistance value of the fabric. Three replicates were set for each group, and the average value of the results was taken.

[0026] The results are shown in Table 1.

[0027] Table 1. Statistical analysis of waterproof performance test results

[0028] As can be seen from Table 1, compared with fabric A-9, the sandwich composite fabric structure formed by coating the outer side of the double-layer fabric with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion and composite polylactic acid-glycolic acid copolymer-based porous membrane in the middle of the double-layer fabric can synergistically improve the waterproof performance of the fabric through multiple barriers.

[0029] Fabric A-1 has a better hydrostatic pressure resistance than fabric A-2. This is because polylactic acid-glycolic acid copolymer has better flexibility and interfacial bonding than polylactic acid, and thus has higher hydrostatic pressure resistance. Fabric A-3, which is not composited with polylactic acid-glycolic acid copolymer-based porous membrane, has a significantly lower hydrostatic pressure resistance than fabrics A-1 and A-2.

[0030] Compared to fabrics A-7 and A-8, fabrics A-4 to A-6 have higher hydrostatic pressure resistance values ​​because the fabric surface has a nano-TiO2 modified thermosensitive polyurethane coating. The nano-TiO2 filler increases the coating density and surface energy, reduces water wettability, and enhances water pressure resistance. Bio-based castor oil provides branched structure and crosslinking points, improving coating integrity and water pressure resistance. Fabrics A-4 to A-6 have adjusted the soft segment ratio in the nano-TiO2 modified waterborne thermosensitive polyurethane emulsion. As can be seen from the table, when the mass ratio of bio-based castor oil, polypropylene glycol, and polytetrahydrofuran ether glycol is 2:4:4, the soft segment flexibility and crosslinking density are balanced, resulting in the densest coating and the best waterproof performance.

[0031] (2) Mechanical property testing The thickness of the fabric samples was measured, with 5 locations taken for each type of film sample, and the average value was taken. Each fabric sample was cut into a rectangle with a length of 30 mm and a width of 5 mm, and the breaking strength of the fabric sample was calculated using the following formula: Breaking strength = Breaking force / (width × thickness). During the test, the two ends of the fabric sample were first fixed with the clamp mold of the universal testing machine. The stretching interval was selected as 10 mm, the stretching speed was 20 mm / min, and the stretching was carried out until the fabric broke. Three replicates were set for each group, and the average value of the results was taken.

[0032] The results of the mechanical property tests are summarized in Table 2.

[0033] Table 2 Statistical analysis of mechanical property test results

[0034] As can be seen from Table 2, Fabric A-1 uses polylactic acid-glycolic acid copolymer, which has better toughness and interfacial bonding than polylactic acid, and better compatibility with hot melt adhesive and fabric. It can evenly transmit stress when under stress, and its breaking strength is better than fabric A-2 and fabric A-3 without polylactic acid-glycolic acid copolymer based porous membrane. Compared to fabric A-8, a coating is formed by applying a nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion to the outer side of the double-layer fabric. The nano-TiO2 forms physical cross-linking points in the polyurethane, thereby improving the coating modulus and tensile strength. Comparing fabrics A-4 to A-7, it can be seen that the composition of the nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion affects the mechanical properties of the fabric. The branched structure and hydrogen bonding provided by bio-based castor oil significantly improve the cohesive strength and adhesion of the PU coating. Without bio-based castor oil, the cohesive strength of the coating decreases, affecting the tensile strength of the fabric.

[0035] (3) Air permeability and moisture permeability test The air permeability and moisture permeability of fabric samples are characterized by water vapor transmission rate. Specifically, the YG(B)216-II type fabric moisture permeability meter is used to measure the air permeability and moisture permeability of fabric samples according to the standard of positive cup method in "Textiles 12704.2-2009 Test Methods for Moisture Permeability of Fabrics Part 2: Evaporation Method". The specific steps are as follows: Weigh 34 mL of distilled water into a permeation cup using a graduated cylinder. The diameter of the circular sample is 7 cm. Assemble the sample into a whole in the order of fabric sample-gasket-pressure ring. The environmental parameters of the instrument are 25℃ or 38℃, 50% RH, and wind speed of 0.35 m / s. Turn on the turntable and wait for the instrument to reach the set parameters. Place the assembled membrane sample into the test chamber and allow it to equilibrate for 1 hour. After equilibration, remove the sample and weigh the corresponding mass m0 of each permeation cup in numerical order, accurate to 0.001 g. Then place the permeation cup in the test chamber for 1 hour. Finally, weigh the mass m1 and calculate the difference between the two weighings. The weighing time should be controlled within 1 minute if possible. The moisture permeability of the fabric sample is calculated according to the following formula. Three replicates are set for each fabric sample. The test results are expressed as average values. The unit is g / (m 2 (×24h) In the formula, A is the effective area of ​​the experiment, which is 2.8 × 10⁻⁶. -3 m 2 t represents the test time, in hours (h).

[0036] The results of the air permeability and moisture permeability tests are summarized in Table 3.

[0037] Table 3. Statistics of air permeability and moisture permeability test results

[0038] As shown in Table 3, fabric A-1 exhibits the best air permeability, moisture permeability, and temperature-sensitive response under conditions of 25 ℃ and 38 ℃, respectively. By coating the outer side of the double-layer fabric with a nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion to form a coating, and then composite a polylactic acid-glycolic acid copolymer-based porous membrane between the double-layer fabrics, fabric A-1 exhibits temperature-sensitive response in terms of coating chain segment shrinkage and dense structure at 25 ℃, ensuring fabric stability; at 38 ℃, the temperature-sensitive chain segments expand, forming continuous water vapor channels, thus improving the wear comfort of the fabric by providing temperature-sensitive air permeability and moisture permeability.

[0039] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An outdoor sports windproof and waterproof fabric, characterized in that, It includes two single-piece fabrics, a polylactic acid-glycolic acid copolymer-based porous membrane composited between the two single-piece fabrics, and a waterproof and reinforcing coating formed by coating the outer surface of the two single-piece fabrics with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion. The nano-TiO2 modified waterborne thermosensitive polyurethane emulsion is prepared by reacting a mixture of bio-based castor oil, polypropylene glycol, and polytetrahydrofuran ether glycol as soft segments, after dehydration with hard segments of bio-based pentanediamine diisocyanate to prepare a prepolymer. Subsequently, dimethylolpropionic acid, 1,4-butanediol, and tetrabutyl titanate are added sequentially for chain extension and modification. After neutralization with triethylamine, it is dispersed in water to obtain the emulsion.

2. The outdoor sports windproof and waterproof fabric according to claim 1, characterized in that, The fiber composition of the single-piece fabric, by weight percentage, is 100% polyester, 100% nylon, 90% nylon and 10% spandex, 90% polyester and 10% spandex, or 30% cotton and 70% nylon.

3. A method for preparing an outdoor sports windproof and waterproof fabric as described in any one of claims 1-2. Its features are, Includes the following steps: (1) Dissolve polylactic acid-glycolic acid copolymer in dichloromethane solvent to obtain casting solution, drop the casting solution onto the substrate to cast a film, and wait for the solvent to evaporate; then obtain polylactic acid-glycolic acid copolymer based porous membrane, and remove residual solvent by vacuum drying; (2) Bio-based castor oil, polypropylene glycol and polytetrahydrofuran ether glycol are mixed and dehydrated under vacuum. Then, under the protection of catalyst and nitrogen, they are reacted with bio-based pentanediamine diisocyanate in a butanone system to prepare a prepolymer with terminal isocyanate groups. Subsequently, dimethylolpropionic acid, 1,4-butanediol and tetrabutyl titanate are added in sequence for chain extension and modification. After neutralization with triethylamine, the mixture is dispersed in water to obtain nano-TiO2 modified waterborne thermosensitive polyurethane emulsion. (3) After thickening the nano-TiO2 modified waterborne thermosensitive polyurethane emulsion, it is evenly coated on one side of a single piece of fabric and baked for later use. (4) Take two single fabric pieces coated with nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion in step (3), coat the uncoated side of the two fabric pieces with hot melt adhesive, and place the polylactic acid-hydroxyacetic acid copolymer-based porous membrane prepared in step (1) between the two single fabric pieces coated with hot melt adhesive. After hot pressing and cooling shaping treatment, outdoor sports windproof and waterproof fabric is obtained.

4. The method for preparing an outdoor sports windproof and waterproof fabric according to claim 3, characterized in that, In step (1), the concentration of the casting solution is 2-5 wt%.

5. The method for preparing an outdoor sports windproof and waterproof fabric according to claim 3, characterized in that, In step (1), the casting liquid is dripped onto the substrate to form a film at a temperature of 3035 ℃ and a relative humidity of 5080 %. The substrate is placed in a sealed space, and a saturated sodium chloride aqueous solution is added to maintain the humidity in the sealed space at 7580%. After the solvent evaporates, a polylactic acid-hydroxyacetic acid copolymer-based porous membrane is obtained.

6. The method for preparing an outdoor sports windproof and waterproof fabric according to claim 3, characterized in that, In step (2), the mass ratio of the bio-based castor oil, polypropylene glycol and polytetrahydrofuran ether glycol is 2-3:3-4:3-4.

7. The method for preparing an outdoor sports windproof and waterproof fabric according to claim 3, characterized in that, In step (2), the total amount of the catalyst used accounts for 0.04-0.055% of the total mass of polypropylene glycol and polytetrahydrofuran ether glycol; The amount of methyl ethyl ketone used accounts for 80-90% of the total mass of polypropylene glycol and polytetrahydrofuran ether glycol; The amount of the bio-based pentanediamine diisocyanate used is calculated based on an NCO / OH molar ratio of 1.2-1.

5.

8. The method for preparing an outdoor sports windproof and waterproof fabric according to claim 3, characterized in that, In step (2), the amount of dimethylolpropionic acid used accounts for 5-6% of the mass of the isocyanate-terminated prepolymer; The amount of 1,4-butanediol used accounts for 5-6% of the mass of the isocyanate-terminated prepolymer; The tetrabutyl titanate accounts for 0.1-0.5% of the mass of the isocyanate-terminated prepolymer; The triethylamine-terminated isocyanate group of the prepolymer is 5-6% of its mass.

9. The method for preparing an outdoor sports windproof and waterproof fabric according to claim 3, characterized in that, In step (3), the coating thickness of the nano-TiO2 modified waterborne temperature-sensitive polyurethane emulsion on one side of the single fabric is 100-200 μm.

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