Two-component thermoplastic polyurethane elastic nonwoven fabric and method for producing the same

Abstract

The application discloses a two-component thermoplastic polyurethane elastic non-woven fabric and a preparation method thereof, and is characterized in that the preparation method comprises the following steps: thermoplastic polyurethane resin pre-drying, soft master batch preparation, synergist preparation, A-component melt preparation, B-component melt preparation, spinning, and hot rolling and bonding; in the synergist preparation, hydroxyethyl cellulose is added into water and stirred to obtain a hydroxyethyl cellulose aqueous solution; nano-cellulose and gamma-aminopropyl triethoxysilane are added into water and stirred, and then triisocyanate and sodium hydroxide are added and stirred to obtain a mixed solution; the hydroxyethyl cellulose aqueous solution, the mixed solution and citric acid are mixed, stirred, ultrasonically oscillated, freeze-dried and ground to obtain the synergist; and the two-component thermoplastic polyurethane elastic non-woven fabric prepared by the application has high elasticity, and the air permeability, softness, ultraviolet resistance, high-temperature resistance, friction resistance and wrinkle resistance are improved.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane elastic nonwoven fabrics, and in particular to a two-component thermoplastic polyurethane elastic nonwoven fabric and a preparation method thereof. Background Art

[0002] Nonwoven fabrics are widely used in the hygiene industry. With the improvement of living standards, consumers have higher requirements for the functionality, comfort and breathability of disposable hygiene products. However, traditional spunbond nonwoven materials have elastic limitations. Currently, the traditional methods to solve the elastic stretching problem of nonwoven materials mainly include the following three methods:

[0003] The first method is to use elastic polymers such as polyolefin elastomers, polyurethanes and styrene block copolymers to make elastic nonwoven materials with a single structure through nonwoven technologies such as spunbond and meltblown.

[0004] The second method is to use a composite process to combine elastic materials with non-elastic materials by physical, thermal or chemical bonding, such as combining elastic spandex fibers with non-woven fabrics.

[0005] The third method is to laminate nonwoven materials with elastic films;

[0006] However, the nonwoven materials produced by the above three methods have poor air permeability, softness, UV resistance, high temperature resistance, friction resistance and wrinkle resistance.

[0007] Therefore, how to improve the elasticity of nonwoven materials while improving their breathability, softness, UV resistance, high temperature resistance, friction resistance, and wrinkle resistance has become a hot topic of common concern in the nonwoven materials field and the health care field.

[0008] Chinese patent CN116100884A discloses an elastic, stretchable nonwoven sheet comprising a stretchable nonwoven elastic layer and a stretchable facing layer. The patent describes a laminated composite of a nonwoven material and an elastic film. While the resulting laminate exhibits good elasticity, the elastic film exhibits poor air permeability and softness.

[0009] Chinese patent CN116163072A discloses a melt-spun elastic fiber layer composite material and its manufacturing process, the composite material comprising PP raw material, TPU raw material and SEBS elastic material; the preparation process comprising feeding the PP raw material or TPU raw material into a spun-bonded non-woven device to spin PP fibers or TPU fibers; feeding the SEBS elastic material into the spun-bonded non-woven device to prepare elastic fiber material; the fiber webs spun by each device being transported by a netting machine to a bonding device for consolidation; the consolidated fiber web being subjected to activation treatment in a stretching device to obtain a composite elastic fiber web; the composite elastic fiber web material being slitting and winding. The patent is to composite elastic fiber and non-woven fabric, and the non-woven material prepared has local elastic force, but poor softness, friction resistance and wrinkle resistance. SUMMARY

[0010] In view of the deficiencies of the prior art, the present application provides a two-component thermoplastic polyurethane elastic non-woven fabric and a preparation method thereof. The prepared two-component thermoplastic polyurethane elastic non-woven fabric has high elasticity, and improved air permeability, softness, ultraviolet resistance, high temperature resistance, friction resistance and wrinkle resistance.

[0011] To solve the above technical problems, the technical solutions adopted by the present application are as follows:

[0012] The preparation method of the two-component thermoplastic polyurethane elastic non-woven fabric comprises the following steps: pre-drying of thermoplastic polyurethane resin, preparation of soft master batch, preparation of synergist, preparation of A component melt, preparation of B component melt, spinning, and hot rolling and bonding.

[0013] The thermoplastic polyurethane resin is pre-dried. Before processing, the polyurethane resin to be used is dried in a dehumidified air dryer at 80-90℃ for 2-3h to ensure that the water content of the polyurethane resin is <0.02%.

[0014] The soft master batch is prepared by uniformly mixing polyethylene wax, oleic acid amide and polyurethane resin, feeding into a twin-screw extruder for extrusion and granulation, controlling the processing temperature of the twin-screw extruder to be 170-250℃, and then melting and cutting to obtain the soft master batch.

[0015] In the preparation of the soft master batch, the weight ratio of polyethylene wax, oleic acid amide and polyurethane resin is 1-1.5:12-15:10-75.

[0016] The Shore hardness of the polyurethane resin is 50-100A, the 100% elastic modulus is 4-10MPa, and the 300% elastic modulus is 12-20MPa.

[0017] Preferably, the Shore hardness of the polyurethane resin is 80-82A, the 100% elastic modulus is 4-10MPa, and the 300% elastic modulus is 12-20MPa.

[0018] Preferably, the processing temperature of the twin-screw extruder is 180-200℃;

[0019] The preparation of the synergist, hydroxyethyl cellulose is added to water, stirred at 60-65℃ for 8-10min at a stirring speed of 100-120rpm to obtain a hydroxyethyl cellulose aqueous solution; nanocellulose and γ-aminopropyl triethoxysilane are added to water, stirred at 60-65℃ for 14-16min at a stirring speed of 100-120rpm, then trimer isocyanate and sodium hydroxide are added, stirred at 70-75℃ for 30-35min at a stirring speed of 200-220rpm to obtain a mixed solution; the hydroxyethyl cellulose aqueous solution, the mixed solution and citric acid are mixed, stirred at 70-75℃ for 1-1.5h at a stirring speed of 200-220rpm, then ultrasonic oscillation is performed, the frequency of the ultrasonic oscillation is controlled to be 20-30kHz, and the time is controlled to be 30-40min, after the ultrasonic oscillation is completed, freeze-drying is performed, the temperature of the freeze-drying is controlled to be -40℃ to -35℃, and the time is controlled to be 22-25h, after the freeze-drying is completed, grinding is performed to 300-500 meshes to obtain the synergist;

[0020] In the preparation of the synergist, the weight ratio of hydroxyethyl cellulose to water in the hydroxyethyl cellulose aqueous solution is 50-55:3000-3200;

[0021] In the mixed solution, the weight ratio of nanocellulose, γ-aminopropyl triethoxysilane, water, trimer isocyanate and sodium hydroxide is 5-6:1-1.2:200-220:2-2.5:5-6;

[0022] In the hydroxyethyl cellulose aqueous solution, the weight ratio of hydroxyethyl cellulose, in the mixed solution, the weight ratio of nanocellulose and citric acid is 50-55:5-6:7-10;

[0023] The preparation of the A component melt, 80-85 parts by weight of polyurethane resin, 2-2.5 parts by weight of soft master batch and 0.3-0.5 parts by weight of synergist are added to the screw extruder for melt extrusion, the temperature of the screw of the screw extruder is controlled to be 170-250℃, the rotation speed is controlled to be 45-75rpm, and the torque is controlled to be 30-80N, then the melt is filtered, metered and conveyed to the parallel spinning box to obtain the A component melt;

[0024] In the preparation of the A component melt, the Shore hardness of the polyurethane resin is 50-100A, the 100% elastic modulus is 4-10MPa, and the 300% elastic modulus is 12-20MPa;

[0025] Preferably, the polyurethane resin has a Shore hardness of 80-82A, a 100% modulus of elasticity of 4-10 MPa, and a 300% modulus of elasticity of 12-20 MPa.

[0026] In the preparation of the B-component melt, the polyurethane resin has a Shore hardness of 60-100A, a 100% modulus of elasticity of 5-15 MPa, and a 300% modulus of elasticity of 15-30 MPa.

[0027] Preferably, the polyurethane resin has a Shore hardness of 85-90A, a 100% modulus of elasticity of 4-10 MPa, and a 300% modulus of elasticity of 12-20 MPa.

[0028] Preferably, the polyurethane resin has a Shore hardness of 85-90A, a 100% modulus of elasticity of 4-10 MPa, and a 300% modulus of elasticity of 12-20 MPa.

[0029] Preferably, the temperature of the screw of the screw extruder is 190-230°C.

[0030] In the spinning, 20-80 parts by weight of the A-component melt and 80-20 parts by weight of the melt are fed into the side-by-side spinning box for spinning, the temperature of the side-by-side spinning box is controlled to be 200-230°C, the spinning plate aperture is 0.4-0.8 mm, the extrusion amount per hole is 0.4-1.5 g / min, and the hot melt yarn is obtained after spinning. After side-blow cooling and drafting, the hot melt yarn is fed into the online hot air activation system for online heating and activation treatment, so that the fiber is further helically crimped to obtain a fiber web. The hot air temperature of the online heating and activation treatment is controlled to be 100-180°C, the distance from the air outlet of the activation system to the height of the fiber web is 60-350 mm, and the hot air volume is 1000-3000 m 3 / h.

[0031] In the hot rolling and bonding, the three-layer fiber web is pre-pressed, the weight ratio of the upper fiber web, the middle fiber web, and the lower fiber web is 10-40:20-80:10-40, the pre-pressing temperature is controlled to be 60-140°C, and after pre-pressing, hot rolling and bonding are performed, the hot roller temperature during hot rolling is controlled to be 60-150°C, and the pressure is 60-140 daN / cm. Then, after cooling roll shaping, hot air is circulated in the drying machine, the hot air temperature is controlled to be 40-120°C, and finally the roll is wound into a roll by a winding machine to obtain a double-component thermoplastic polyurethane elastic non-woven fabric.

[0032] The double-component thermoplastic polyurethane elastic non-woven fabric is prepared by the foregoing method.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The method for preparing a bicomponent thermoplastic polyurethane elastic nonwoven fabric of the present invention comprises a bicomponent fiber having an A / B structure in parallel. The principle is to cause the two elastic materials to shrink and crystallize to different degrees to produce spiral curls, making the fabric fluffy, soft and elastic.

[0035] (2) The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric of the present invention has high elasticity, and the force of the first stretching to 100% is 6.82-7.04N, and the force of the second stretching to 100% is 6.01-6.23N;

[0036] (3) The preparation method of the two-component thermoplastic polyurethane elastic non-woven fabric of the present invention has good air permeability, and the air permeability is 1.06×10 -3 L / (cm 2 ·s)-1.13×10 -3 L / (cm 2 s);

[0037] (4) The method for preparing the two-component thermoplastic polyurethane elastic non-woven fabric of the present invention has good softness, with an MD softness of 4-7G and a CD softness of 3-5G;

[0038] (5) The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric of the present invention has good wrinkle resistance, a recovery angle of 3.4-4.0°, and a drape coefficient of 33.4-36.1%;

[0039] (6) The method for preparing the two-component thermoplastic polyurethane elastic non-woven fabric of the present invention has good friction resistance. The friction resistance test shows that the friction resistance times are 27020-28172;

[0040] (7) The method for preparing the two-component thermoplastic polyurethane elastic non-woven fabric of the present invention has good UV resistance. After being continuously irradiated under a xenon lamp for 100 days, the MD softness is 5-8G, the CD softness is 3-6G, and the air permeability is 1.04×10 -3 L / (cm 2 ·s)-1.12×10 -3 L / (cm 2 s), the force of the first stretching 100% is 6.94-7.23N, and the force of the second stretching 100% is 6.09-6.31N;

[0041] (8) The preparation method of the two-component thermoplastic polyurethane elastic non-woven fabric of the present application has good high-temperature resistance, and after being placed under a xenon lamp for continuous irradiation for 100 days, the MD softness is 4-7 G, the CD softness is 3-5 G, the air permeability is 1.05*10 -3 L / (cm 2 ·s)-1.13*10 -3 L / (cm 2 ·s), the force for the first stretching of 100% is 6.91-7.19 N, and the force for the second stretching of 100% is 6.12-6.34 N. DETAILED DESCRIPTION

[0042] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described.

[0043] Example 1

[0044] The preparation method of the two-component thermoplastic polyurethane elastic non-woven fabric, specifically comprises the following steps:

[0045] 1. Pre-drying of the thermoplastic polyurethane resin: before processing, the polyurethane resin to be used is dried in a dehumidified air dryer at 80℃ for 2h to ensure that the water content of the polyurethane resin is <0.02%.

[0046] 2. Preparation of soft master batch: after mixing polyethylene wax, oleic acid amide and polyurethane resin uniformly, they are added into a twin-screw extruder for extrusion and granulation, the processing temperature of the twin-screw extruder is controlled at 170℃, and after granulation, melting and cutting are carried out to obtain the soft master batch;

[0047] The weight ratio of the polyethylene wax, the oleic acid amide and the polyurethane resin is 1:12:10.

[0048] The Shore hardness of the polyurethane resin is 50A, the 100% elastic modulus is 4 MPa, and the 300% elastic modulus is 12 MPa.

[0049] 3. Preparation of synergist: hydroxyethyl cellulose is added to water, stirred at 60℃ for 8min at a stirring speed of 100rpm to obtain a hydroxyethyl cellulose aqueous solution; nanocellulose, γ-aminopropyl triethoxysilane are added to water, stirred at 60℃ for 14min at a stirring speed of 100rpm, then trimer isocyanate, sodium hydroxide are added, stirred at 70℃ for 30min at a stirring speed of 200rpm to obtain a mixed solution; the hydroxyethyl cellulose aqueous solution, the mixed solution, citric acid are mixed, stirred at 70℃ for 1h at a stirring speed of 200rpm, then ultrasonic oscillation is carried out, the frequency of the ultrasonic oscillation is controlled to be 20kHz, the time is 30min, after the ultrasonic oscillation is completed, freeze-drying is carried out, the temperature of the freeze-drying is controlled to be -40℃, the time is 22h, after the freeze-drying is completed, grinding is carried out to 300 meshes to obtain the synergist;

[0050] The weight ratio of hydroxyethyl cellulose to water in the hydroxyethyl cellulose aqueous solution is 50:3000;

[0051] The weight ratio of nanocellulose, γ-aminopropyl triethoxysilane, water, trimer isocyanate, sodium hydroxide in the mixed solution is 5:1:200:2:5;

[0052] The weight ratio of hydroxyethyl cellulose in the hydroxyethyl cellulose aqueous solution, nanocellulose, citric acid in the mixed solution is 50:5:7;

[0053] 4. Preparation of A component melt: 80 parts by weight of polyurethane resin, 2 parts by weight of soft master batch, 0.3 parts by weight of synergist are added to a screw extruder for melt extrusion, the temperature of the screw of the screw extruder is controlled to be 170℃, the rotating speed is 45rpm, the torque is 30N, then melt filtration, melt metering are carried out, and the obtained product is delivered to a parallel spinning box to obtain an A component melt;

[0054] The Shore hardness of the polyurethane resin is 50A, the 100% elastic modulus is 4MPa, and the 300% elastic modulus is 12MPa;

[0055] 5. Preparation of B component melt: 80 parts by weight of polyurethane resin, 1.5 parts by weight of soft master batch, 0.5 parts by weight of synergist are added to a screw extruder for melt extrusion, the temperature of the screw of the screw extruder is controlled to be 170℃, the rotating speed is 45rpm, the torque is 30N, then melt filtration, melt metering are carried out, and the obtained product is delivered to a parallel spinning box to obtain a B component melt;

[0056] The Shore hardness of the polyurethane resin is 60A, the 100% elastic modulus is 5MPa, and the 300% elastic modulus is 15MPa;

[0057] 6. Spinning: 60 parts by weight of the A component melt and 40 parts by weight of the B component melt are added to a side-by-side spinning box for spinning, the temperature of the side-by-side spinning box is controlled to be 200℃, the spinning plate aperture is 0.4mm, the extrusion amount of each hole is 0.4g / min, and the hot melt yarn is obtained after spinning. After the hot melt yarn is cooled by side blowing and drawn, it is conveyed to an online hot air activation system for online heating and activation treatment to make the fiber further spiral crimped to obtain a fiber web. The hot air temperature of the online heating and activation treatment is controlled to be 100℃, the distance from the air outlet of the activation system to the height of the fiber web is 60mm, and the hot air volume is 1000m 3 / h.

[0058] 7. Hot rolling and bonding: the three-layer fiber web is pre-pressed, the weight ratio of the upper fiber web, the middle fiber web and the lower fiber web is 20:60:20, the pre-pressing temperature is controlled to be 60℃, and after pre-pressing, hot rolling and bonding are carried out, the hot roller temperature during hot rolling is controlled to be 60℃, the pressure is 60daN / cm, then the cooling roller is shaped and the hot air circulating dryer is entered, the hot air temperature is controlled to be 40℃, and finally the winding machine is entered to be wound to obtain the double-component thermoplastic polyurethane elastic non-woven fabric.

[0059] Example 2

[0060] The preparation method of the double-component thermoplastic polyurethane elastic non-woven fabric is specifically as follows:

[0061] 1. Pre-drying of thermoplastic polyurethane resin: before processing, the polyurethane resin to be used is dried in a dehumidified air dryer at 85℃ for 2.5h to ensure that the water content of the polyurethane resin is <0.02%.

[0062] 2. Preparation of soft master batch: after the polyethylene wax, oleic acid amide and polyurethane resin are uniformly mixed, they are added to a twin-screw extruder for extrusion and granulation, the processing temperature of the twin-screw extruder is controlled to be 200℃, and after granulation, melting and pelletizing are carried out to obtain the soft master batch.

[0063] The weight ratio of the polyethylene wax, the oleic acid amide and the polyurethane resin is 1.2:14:50.

[0064] The Shore hardness of the polyurethane resin is 80A, the 100% elastic modulus is 5MPa, and the 300% elastic modulus is 15MPa.

[0065] 3. Preparation of synergist: hydroxyethyl cellulose is added into water, stirred at 62℃ for 9min at a stirring speed of 110rpm to obtain a hydroxyethyl cellulose aqueous solution; nanocellulose and γ-aminopropyl triethoxysilane are added into water, stirred at 62℃ for 15min at a stirring speed of 110rpm, then trimer isocyanate and sodium hydroxide are added, stirred at 72℃ for 32min at a stirring speed of 210rpm to obtain a mixed solution; the hydroxyethyl cellulose aqueous solution, the mixed solution and citric acid are mixed, stirred at 72℃ for 1.2h at a stirring speed of 210rpm, then ultrasonic oscillation is carried out, the frequency of the ultrasonic oscillation is controlled to be 25kHz, and the time is controlled to be 35min, after the ultrasonic oscillation is completed, freeze-drying is carried out, the temperature of the freeze-drying is controlled to be -38℃, and the time is controlled to be 23h, after the freeze-drying is completed, grinding is carried out to 400 meshes to obtain the synergist;

[0066] The weight ratio of the hydroxyethyl cellulose to water in the hydroxyethyl cellulose aqueous solution is 52:3100;

[0067] The weight ratio of the nanocellulose, the γ-aminopropyl triethoxysilane, the water, the trimer isocyanate and the sodium hydroxide in the mixed solution is 5.5:1.1:210:2.2:5.5;

[0068] The weight ratio of the hydroxyethyl cellulose in the hydroxyethyl cellulose aqueous solution, the nanocellulose in the mixed solution and the citric acid is 52:5.5:8;

[0069] 4. Preparation of A component melt: 82 parts by weight of polyurethane resin, 2.2 parts by weight of soft master batch and 0.4 parts by weight of synergist are added into a screw extruder for melt extrusion, the temperature of the screw of the screw extruder is controlled to be 200℃, the rotating speed is controlled to be 60rpm, and the torque is controlled to be 50N, then melt filtration and melt metering are carried out, and the obtained product is delivered to a parallel spinning box to obtain an A component melt;

[0070] The Shore hardness of the polyurethane resin is 80A, the 100% elastic modulus is 7MPa, and the 300% elastic modulus is 15MPa;

[0071] 5. Preparation of B component melt: 82 parts by weight of polyurethane resin, 1.8 parts by weight of soft master batch and 0.55 parts by weight of synergist are added into a screw extruder for melt extrusion, the temperature of the screw of the screw extruder is controlled to be 200℃, the rotating speed is controlled to be 60rpm, and the torque is controlled to be 50N, then melt filtration and melt metering are carried out, and the obtained product is delivered to a parallel spinning box to obtain a B component melt;

[0072] The Shore hardness of the polyurethane resin is 85A, the 100% elastic modulus is 10MPa, and the 300% elastic modulus is 20MPa;

[0073] 6. Spinning: 70 parts by weight of the A component melt and 30 parts by weight of the B component melt are added to a side-by-side spinning box for spinning, the temperature of the side-by-side spinning box is controlled to be 220°C, the spinning plate aperture is 0.6mm, the extrusion amount of each hole is 1g / min, and the hot melt yarn is obtained after spinning. After the hot melt yarn is cooled by side blowing and drawn, it is conveyed to an online hot air activation system for online heating and activation treatment to make the fiber further spiral crimped to obtain a fiber web. The hot air temperature of the online heating and activation treatment is controlled to be 140°C, the distance from the air outlet of the activation system to the height of the fiber web is 200mm, and the hot air volume is 2000m 3 / h;

[0074] 7. Hot rolling and bonding: the three-layer fiber web is pre-pressed, the weight ratio of the upper fiber web, the middle fiber web and the lower fiber web is 30:40:30, the pre-pressing temperature is controlled to be 100°C, and after pre-pressing, hot rolling and bonding is performed, the hot roller temperature during hot rolling is controlled to be 100°C, and the pressure is 100daN / cm. Then, after cooling roll shaping, hot air circulation drying machine is passed through, the hot air temperature is controlled to be 80°C, and finally, it is wound into a roll by a winding machine to obtain a two-component thermoplastic polyurethane elastic non-woven fabric.

[0075] Example 3

[0076] The preparation method of the two-component thermoplastic polyurethane elastic non-woven fabric is specifically as follows:

[0077] 1. Pre-drying of thermoplastic polyurethane resin: before processing, the polyurethane resin to be used is dried in a dehumidified air dryer at 90°C for 3h to ensure that the water content of the polyurethane resin is <0.02%.

[0078] 2. Preparation of soft master batch: after the polyethylene wax, oleic acid amide and polyurethane resin are uniformly mixed, they are added to a twin-screw extruder for extrusion and granulation. The processing temperature of the twin-screw extruder is controlled to be 250°C, and after granulation, melting and pelletizing are performed to obtain a soft master batch.

[0079] The weight ratio of the polyethylene wax, the oleic acid amide and the polyurethane resin is 1.5:15:75.

[0080] The Shore hardness of the polyurethane resin is 100A, the 100% elastic modulus is 10MPa, and the 300% elastic modulus is 20MPa.

[0081] 3. Preparation of synergist: hydroxyethyl cellulose is added into water, stirred at 65℃ for 10 min at a stirring speed of 120 rpm to obtain a hydroxyethyl cellulose aqueous solution; nanocellulose and γ-aminopropyl triethoxysilane are added into water, stirred at 65℃ for 16 min at a stirring speed of 120 rpm, then trimer isocyanate and sodium hydroxide are added, stirred at 75℃ for 35 min at a stirring speed of 220 rpm to obtain a mixed solution; the hydroxyethyl cellulose aqueous solution, the mixed solution and citric acid are mixed, stirred at 75℃ for 1.5 h at a stirring speed of 220 rpm, then ultrasonic oscillation is performed, the frequency of the ultrasonic oscillation is controlled to be 30 kHz, and the time is controlled to be 40 min, after the ultrasonic oscillation is completed, freeze-drying is performed, the temperature of the freeze-drying is controlled to be -35℃, and the time is controlled to be 25 h, after the freeze-drying is completed, grinding is performed to 500 meshes to obtain the synergist;

[0082] The weight ratio of the hydroxyethyl cellulose to water in the hydroxyethyl cellulose aqueous solution is 55:3200;

[0083] The weight ratio of the nanocellulose, the γ-aminopropyl triethoxysilane, the water, the trimer isocyanate and the sodium hydroxide in the mixed solution is 6:1.2:220:2.5:6;

[0084] The weight ratio of the hydroxyethyl cellulose in the hydroxyethyl cellulose aqueous solution, the nanocellulose and the citric acid in the mixed solution is 55:6:10;

[0085] 4. Preparation of A component melt: 85 parts by weight of polyurethane resin, 2.5 parts by weight of soft master batch and 0.5 parts by weight of synergist are added into a screw extruder for melt extrusion, the temperature of the screw of the screw extruder is controlled to be 250℃, the rotating speed is controlled to be 75 rpm, and the torque is controlled to be 80 N, then melt filtration and melt metering are performed, and the obtained product is delivered to a parallel spinning box to obtain an A component melt;

[0086] The Shore hardness of the polyurethane resin is 100A, the 100% elastic modulus is 10 MPa, and the 300% elastic modulus is 20 MPa;

[0087] 5. Preparation of B component melt: 85 parts by weight of polyurethane resin, 2 parts by weight of soft master batch and 0.6 parts by weight of synergist are added into a screw extruder for melt extrusion, the temperature of the screw of the screw extruder is controlled to be 250℃, the rotating speed is controlled to be 75 rpm, and the torque is controlled to be 80 N, then melt filtration and melt metering are performed, and the obtained product is delivered to a parallel spinning box to obtain a B component melt;

[0088] The Shore hardness of the polyurethane resin is 100A, the 100% elastic modulus is 15 MPa, and the 300% elastic modulus is 30 MPa;

[0089] 6. Spinning: 80 parts by weight of the A component melt and 20 parts by weight of the B component melt are added to a side-by-side spinning box and spun, the temperature of the side-by-side spinning box is controlled at 230°C, the spinning plate aperture is 0.8 mm, the extrusion amount per hole is 1.5 g / min, and the hot melt yarn is obtained after spinning, the hot melt yarn is cooled by side blowing, drawn, and then conveyed to an online hot air activation system for online heating and activation treatment to make the fiber further spiral crimped to obtain a fiber web, the hot air temperature of the online heating and activation treatment is controlled at 180°C, the distance from the air outlet of the activation system to the height of the fiber web is 350 mm, and the hot air volume is 3000 m 3 / h;

[0090] 7. Hot rolling and bonding: the three-layer fiber web is pre-pressed, the weight ratio of the upper fiber web, the middle fiber web, and the lower fiber web is 25:50:25, the pre-pressing temperature is controlled at 140°C, and after pre-pressing, hot rolling and bonding are performed, the hot roller temperature during hot rolling is controlled at 150°C, and the pressure is 140 daN / cm, then the cooling roller is shaped, hot air is circulated in the drying machine, the hot air temperature is controlled at 120°C, and finally the roll is formed in the winding machine to obtain the double-component thermoplastic polyurethane elastic non-woven fabric.

[0091] Comparative Example 1

[0092] The same double-component thermoplastic polyurethane elastic non-woven fabric preparation method as in Example 2 is used, except that the preparation of the synergist in Step 3 is omitted, and the addition of the synergist in the preparation of the A component melt in Step 4 and the preparation of the B component melt in Step 5 is also omitted.

[0093] Test Example 1

[0094] The MD softness, CD softness, air permeability, force to stretch 100% the first time, force to stretch 100% the second time, recovery angle, and drape coefficient of the double-component thermoplastic polyurethane elastic non-woven fabric prepared in Examples 1-3 and Comparative Example 1 are tested, and the test results are as follows:

[0095]

[0096] Test Example 2

[0097] The double-component thermoplastic polyurethane elastic non-woven fabric prepared in Example 1 is loaded into a circular fabric abrasion tester, and the number of rubs until the non-woven fabric breaks is recorded, and the results are as follows:

[0098]

[0099] Test Example 3

[0100] The two-component thermoplastic polyurethane elastic nonwoven fabric prepared in Example 1 was continuously irradiated under a xenon lamp for 100 days, with the power of the xenon lamp controlled at 100 W, and then the MD softness, CD softness, air permeability, force for first stretching 100%, and force for second stretching 100% were tested, with the test results as follows:

[0101]

[0102] Test Example 4

[0103] The two-component thermoplastic polyurethane elastic nonwoven fabric prepared in Example 1 was placed at 50°C for 100 days, and then the MD softness, CD softness, air permeability, force for first stretching 100%, and force for second stretching 100% were tested, with the test results as follows:

[0104]

[0105] Unless otherwise stated, the percentages used in the present application are mass percentages.

[0106] It should be finally pointed out that the above only describes the preferred embodiments of the present application and is not intended to limit the present application, and although the present application 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 make equivalent replacements to some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric, characterized in that: The method comprises the following steps: pre-drying thermoplastic polyurethane resin, preparing soft masterbatch, preparing synergist, preparing component A melt, preparing component B melt, spinning, and hot rolling bonding; The thermoplastic polyurethane resin is pre-dried. Before processing, the polyurethane resin to be used is dried in a dehumidified air dryer at 80-90° C. for 2-3 hours to ensure that the water content of the polyurethane resin is less than 0.02%; The soft masterbatch is prepared by uniformly mixing polyethylene wax, oleic acid amide and polyurethane resin, adding the mixture into a twin-screw extruder for extrusion and granulation, controlling the processing temperature of the twin-screw extruder to be 170-250° C., and melting and pelletizing the mixture after granulation to obtain the soft masterbatch; The synergist is prepared by adding hydroxyethyl cellulose to water and stirring at 60-65° C. to obtain a hydroxyethyl cellulose aqueous solution; adding nanocellulose and γ-aminopropyltriethoxysilane to water and stirring at 60-65° C., then adding isocyanate and sodium hydroxide and stirring at 70-75° C. to obtain a mixed solution; mixing the hydroxyethyl cellulose aqueous solution, the mixed solution and citric acid, stirring at 70-75° C., then ultrasonically shaking, freeze-drying and grinding to obtain the synergist; The component A melt is prepared by adding 80-85 parts by weight of a polyurethane resin, 2-2.5 parts by weight of a softening masterbatch, and 0.3-0.5 parts by weight of a synergist into a screw extruder for melt extrusion, controlling the screw temperature of the screw extruder to be 170-250° C., the speed to be 45-75 rpm, and the torque to be 30-80 N. The melt is then filtered and metered before being transported to a parallel spinning manifold to obtain the component A melt. The component B melt is prepared by adding 80-85 parts by weight of a polyurethane resin, 1.5-2 parts by weight of a softening masterbatch, and 0.5-0.6 parts by weight of a synergist into a screw extruder for melt extrusion. The screw temperature of the screw extruder is controlled to be 170-250° C., the speed is 45-75 rpm, and the torque is 30-80 N. The melt is then filtered and metered before being transported to a parallel spinning manifold to obtain the component B melt.

2. The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric according to claim 1, characterized in that: The method comprises the following steps: in the preparation of the synergist, the weight ratio of hydroxyethyl cellulose to water in the hydroxyethyl cellulose aqueous solution is 50-55:3000-3200; The weight ratio of nanocellulose, γ-aminopropyltriethoxysilane, water, triisocyanate, and sodium hydroxide in the mixed solution is 5-6:1-1.2:200-220:2-2.5:5-6; The weight ratio of hydroxyethyl cellulose in the hydroxyethyl cellulose aqueous solution, nanocellulose in the mixed solution, and citric acid is 50-55:5-6:7-10; The freeze-drying temperature is -40°C to -35°C, and the time is 22-25 hours.

3. The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric according to claim 1, characterized in that: In the preparation of the soft masterbatch, the weight ratio of polyethylene wax, oleic acid amide, and polyurethane resin is 1-1.5:12-15:10-75; The polyurethane resin has a Shore hardness of 50-100A, a 100% elastic modulus of 4-10 MPa, and a 300% elastic modulus of 12-20 MPa.

4. The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric according to claim 1, characterized in that: In the preparation of the A component melt, the polyurethane resin has a Shore hardness of 50-100A, a 100% elastic modulus of 4-10 MPa, and a 300% elastic modulus of 12-20 MPa.

5. The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric according to claim 1, characterized in that: In the preparation of the B component melt, the polyurethane resin has a Shore hardness of 60-100A, a 100% elastic modulus of 5-15 MPa, and a 300% elastic modulus of 15-30 MPa.

6. The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric according to claim 1, characterized in that: The spinning comprises adding 20-80 parts by weight of the melt of component A and 80-20 parts by weight of the melt of component B into parallel spinning boxes for spinning, controlling the temperature of the parallel spinning boxes to be 200-230° C., the aperture of the spinneret to be 0.4-0.8 mm, and the extrusion amount per hole to be 0.4-1.5 g / min. After the spinning is completed, hot melt fibers are obtained, and the hot melt fibers are side-blown for cooling and stretching, and then transported to an online hot air activation system for online heating activation treatment, so that the fibers are further spirally curled to obtain a fiber web, controlling the hot air temperature of the online heating activation treatment to be 100-180° C., the height of the activation system outlet from the fiber web to be 60-350 mm, and the hot air volume to be 1000-3000 m 3 / h.

7. The method for preparing a two-component thermoplastic polyurethane elastic non-woven fabric according to claim 1, characterized in that: The hot rolling bonding method pre-presses the three-layer fiber web, wherein the weight ratio of the upper fiber web, the middle fiber web, and the lower fiber web is 10-40:20-80:10-40, and the pre-pressing temperature is controlled at 60-140°C. After the pre-pressing is completed, hot rolling bonding is performed, and the temperature of the hot rolling roller during hot rolling is controlled at 60-150°C and the pressure is 60-140 daN / cm. The fiber web is then shaped by a cooling roller and then passed into a hot air circulation dryer, and the hot air temperature is controlled at 40-120°C. Finally, the fiber web enters a winder to be rolled, thereby obtaining a two-component thermoplastic polyurethane elastic non-woven fabric.

8. Two-component thermoplastic polyurethane elastic non-woven fabric, characterized in that: Prepared by the preparation method according to any one of claims 1 to 7.

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