Composite nonwoven fabric with high absorption performance and preparation method thereof

Abstract

The invention relates to the field of non-woven fabrics, and in particular to a composite non-woven fabric with high absorption performance and a preparation method thereof. Polylactic acid fiber, PE / PET composite fiber, and sodium alginate fiber are selected as raw materials of the composite non-woven fabric; sodium alginate is used as a shell layer, polyethylene oxide is used as a core layer, and coaxial electrospinning is used to prepare the composite sodium alginate fiber with a core-shell structure; gelatin and a composite organic framework are introduced into the shell layer, and an emulsion of eugenol is introduced into the core layer; an antibacterial impregnation liquid is prepared using the composite organic framework, chitosan, and dopamine hydrochloride; a titanium-based organic framework is synthesized using 2-aminoterephthalic acid as a ligand, and layered hydroxides are in situ grown on the titanium-based organic framework using copper nitrate and urea; and the components and contents of a base fabric web and a moisture-absorbing web are controlled so that they are laminated and combed to form a composite fiber web with a gradient structure.

Description

Technical Field

[0001] The present invention relates to the field of non-woven fabrics, in particular to a composite non-woven fabric with high absorption performance and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards and the continuous enhancement of consumers' awareness of hygiene, the use of disposable sanitary products such as sanitary napkins, diapers, and adult incontinence products has become more and more popular. Consumers' requirements for disposable sanitary products are no longer limited to basic performance, and they have higher requirements for their hygiene, health care, comfort, and environmental protection. Sanitary products are also developing towards differentiation, high-end, and green.

[0003] Existing sanitary napkins on the market mostly use air-through nonwoven fabrics for their surface layers. These fabrics offer excellent resilience, high porosity, a fluffy structure, and are soft and breathable. Because they are manufactured without the use of any chemical adhesives, they are environmentally friendly. However, these single-structured air-through nonwovens struggle to achieve asymmetric liquid transport. Furthermore, existing air-through nonwovens are often made from non-biodegradable polyethylene, which is often discarded after extensive use, creating environmental pollution concerns. Summary of the Invention

[0004] The object of the present invention is to provide a composite nonwoven fabric with high absorption performance and a preparation method thereof, so as to solve the problems in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A method for preparing a composite nonwoven fabric with high absorption performance comprises the following steps:

[0007] S1: mixing the composite organic framework, chitosan, dopamine hydrochloride, and Tris-HCl buffer solution to obtain an antibacterial impregnation solution;

[0008] S2: Composite sodium alginate fibers with a core-shell structure were prepared by coaxial electrospinning with sodium alginate as the shell layer and polyethylene oxide as the core layer;

[0009] S3: respectively immersing the polylactic acid fiber and the composite sodium alginate fiber in an antibacterial impregnation solution to obtain a modified polylactic acid fiber and a modified composite fiber;

[0010] S4: Blending the PE / PET composite fiber and the modified polylactic acid fiber by opening, combing, and obtaining a base fabric web; Blending the modified polylactic acid fiber and the modified composite fiber by opening, combing, and obtaining a moisture-absorbing web;

[0011] S5: The base fabric web and the moisture-absorbing web are laminated and combed in a ratio of 1:1, and subjected to hot air treatment to obtain a composite non-woven fabric with high absorption performance.

[0012] Furthermore, the mass ratio of the PE / PET composite fiber to the modified polylactic acid fiber in the base fabric is 3:2.

[0013] Furthermore, the PE / PET composite fiber has polyester fiber PET as the core layer and PE as the skin layer.

[0014] Furthermore, the mass ratio of the modified polylactic acid fiber to the modified composite fiber in the moisture-absorbing web is 4:1.

[0015] In order to make the prepared non-woven fabric play a role in diluting menstrual blood when used as the surface layer of sanitary napkins, the raw materials of the non-woven fabric are adjusted so that the composite non-woven fabric has high absorption performance. The non-woven fabric is designed to be stacked and combed with a base fabric web and a moisture-absorbing web to form a composite fiber web with a gradient structure, which has unidirectional moisture conductivity. When used in sanitary napkins, it can make menstrual blood seep downward quickly and avoid back osmosis due to the design of the gradient structure.

[0016] Furthermore, the composition of the antibacterial impregnation solution is: 200 mL of 0.1 mol / L Tris-HCl buffer solution as a solvent, wherein 0.5 g of the composite organic framework, 10 g of chitosan, and 10 g of dopamine hydrochloride are contained, and the pH value of the solution is 8.4-8.6.

[0017] Furthermore, the working conditions of the hot air treatment are: temperature of 125-135°C.

[0018] Furthermore, the working conditions of coaxial electrospinning are: positive voltage 18 kV, negative voltage -2 kV, shell layer flow rate 0.3 mm / min, core layer flow rate 0.15 mm / min, receiving distance 25 cm, translation speed 300 mm / min, temperature 25 ° C, and relative humidity 40%-50%.

[0019] Furthermore, the composition of the shell layer solution is: 100 mL of deionized water as solvent, containing 2-5 g of sodium alginate, 2-5 g of gelatin, and 0.05-0.1 g of a composite organic framework; the composition of the core layer solution is: 100 mL of deionized water as solvent, containing 1-2 g of eugenol, 0.1-0.3 g of Tween 80, and 2-5 g of polyethylene oxide.

[0020] Furthermore, the preparation of the composite organic framework includes the following steps:

[0021] 1) 2-aminoterephthalic acid, N,N-dimethylformamide, and methanol are mixed, tetrabutyl titanate is added, and the mixture is stirred for 20-30 minutes. Glacial acetic acid is added and stirred for 20-30 minutes. The mixture is kept at 150° C. for 22-24 hours, washed, centrifuged, and dried to obtain a titanium-based organic framework.

[0022] 2) A titanium-based organic framework, copper nitrate, deionized water, and ethanol were mixed, urea was added, and the mixture was stirred for 20 minutes. The mixture was kept at 130° C. for 24 hours, washed, and dried to obtain a composite organic framework.

[0023] Furthermore, the preparation of the composite sodium alginate fiber includes the following steps:

[0024] Sodium alginate, gelatin, composite organic framework and deionized water are mixed and stirred to prepare a shell solution; eugenol and Tween 80 are mixed and emulsified, polyethylene oxide and deionized water are added, and ultrasonic stirring is performed to prepare a core solution; composite sodium alginate fibers are prepared by coaxial electrospinning.

[0025] Beneficial effects of the present invention:

[0026] The present invention provides a composite non-woven fabric with high absorption performance and a preparation method thereof. The prepared composite non-woven fabric has high absorption performance and simultaneously has high-efficiency antibacterial properties, unidirectional moisture conductivity, biodegradability and good mechanical properties. When applied to the surface layer of a sanitary napkin, it can play a role in diluting menstrual blood.

[0027] Polylactic acid fiber and sodium alginate fiber are selected as the raw materials of composite non-woven fabrics, so that the prepared composite non-woven fabrics have high absorbency and are biodegradable at the same time, which is green and environmentally friendly and meets the requirements of green production;

[0028] However, sodium alginate fibers produced from single sodium alginate have problems of poor mechanical properties and limited antibacterial properties. The present invention uses sodium alginate as the shell layer and polyethylene oxide as the core layer, and adopts coaxial electrospinning to prepare composite sodium alginate fibers with a core-shell structure, thereby greatly improving the mechanical properties and antibacterial properties of the sodium alginate fibers; gelatin and a composite organic framework are introduced into the shell layer to give the shell layer higher antibacterial properties while enhancing the complexity of the shell layer cross-linking network, thereby having a toughening effect on the shell layer and greatly improving the absorbency of the shell layer structure; an emulsion of eugenol is introduced into the core layer to improve the spinnability of polyethylene oxide and at the same time give the core layer a natural antibacterial factor.

[0029] In order to further improve the antibacterial properties and absorbability of polylactic acid fibers and composite sodium alginate fibers, an antibacterial impregnation solution was prepared using a composite organic framework, chitosan, and dopamine hydrochloride; a titanium-based organic framework was synthesized using 2-aminoterephthalic acid as a ligand, and layered hydroxides were in situ grown on the titanium-based organic framework using copper nitrate and urea, thereby improving the broad-spectrum antibacterial properties of the composite organic framework. The aminoquinone network formed between dopamine and chitosan was used to firmly bond chitosan and the composite organic framework to the surface of polylactic acid and composite sodium alginate fibers, thereby greatly improving the antibacterial durability and biocompatibility of the composite non-woven fabric.

[0030] In order to make the prepared non-woven fabric have unidirectional moisture conductivity when used for the surface layer of sanitary napkins, the components and content of the base fabric web and the moisture-absorbing web are controlled so that they are stacked and combed to form a composite fiber web with a gradient structure, which promotes unidirectional movement of liquid in the material, thereby greatly improving the dryness and breathability of the composite non-woven fabric, and showing a lower rewet amount; the high absorbency of the composite non-woven fabric is combined with the gradient structure guide layer of the composite fiber web, so that when it is applied to the surface layer of sanitary napkins, the color of the blood will be visually significantly lighter, which has the effect of reducing blood viscosity, and the residues in the menstrual blood will be quickly absorbed into the composite fiber web, thereby improving the drying effect, increasing visual comfort, and achieving the purpose of diluting menstrual blood. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, and back, such directional indications are only used to explain a specific posture, such as the relative position relationship between components, the movement status, etc. If the specific posture changes, the directional indication will also change accordingly. In addition, the technical solutions between the various embodiments may be combined with each other, but they must be based on the premise that they can be implemented by ordinary technicians in this field. If the combination of technical solutions is mutually inconsistent or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0033] The technical solutions of the present invention are further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0034] Example 1: A method for preparing a composite nonwoven fabric with high absorption performance, comprising the following steps:

[0035] S1: mixing the composite organic framework, chitosan, dopamine hydrochloride, and Tris-HCl buffer solution to obtain an antibacterial impregnation solution;

[0036] The composition of the antibacterial impregnation solution is as follows: 200 mL of 0.1 mol / L Tris-HCl buffer solution as solvent, containing 0.5 g of composite organic framework, 10 g of modified chitosan, and 10 g of dopamine hydrochloride, with a solution pH of 8.4;

[0037] The preparation of the composite organic framework includes the following steps:

[0038] 1) 2 mmol of 2-aminoterephthalic acid, 9 mL of N,N-dimethylformamide, and 1 mL of methanol were mixed, 1.33 mmol of tetrabutyl titanate was added, and the mixture was stirred for 20 min. 1.67 mL of glacial acetic acid was added and stirred for 20 min. The mixture was kept at 150°C for 22 h, washed, centrifuged, and dried to obtain a titanium-based organic framework.

[0039] 2) 1 g of titanium-based organic framework, 1 mmol of copper nitrate, 10 mL of deionized water, and 10 mL of ethanol were mixed, 1 mmol of urea was added, and the mixture was stirred for 20 min. The mixture was kept at 130°C for 24 h, washed, and dried to obtain a composite organic framework;

[0040] S2: The preparation of composite sodium alginate fiber includes the following steps:

[0041] Sodium alginate, gelatin, composite organic framework, and deionized water were mixed and stirred to form a shell solution; eugenol and Tween 80 were mixed and emulsified, and polyethylene oxide and deionized water were added and ultrasonically stirred to form a core solution; composite sodium alginate fibers were prepared by coaxial electrospinning;

[0042] The shell layer solution was composed of 2 g of sodium alginate, 2 g of gelatin, and 0.05 g of the composite organic framework in 100 mL of deionized water. The core layer solution was composed of 1 g of eugenol, 0.1 g of Tween 80, and 2 g of polyethylene oxide in 100 mL of deionized water.

[0043] The working conditions of coaxial electrospinning were: positive voltage 18 kV, negative voltage -2 kV, shell flow rate 0.3 mm / min, core flow rate 0.15 mm / min, receiving distance 25 cm, translation speed 300 mm / min, temperature 25 °C, relative humidity 40%;

[0044] S3: immersing the polylactic acid fiber and the composite sodium alginate fiber in an antibacterial impregnation solution to obtain modified polylactic acid fiber and modified composite fiber;

[0045] S4: Blending the PE / PET composite fiber and the modified polylactic acid fiber by opening, combing, and obtaining a base fabric web; Blending the modified polylactic acid fiber and the modified composite fiber by opening, combing, and obtaining a moisture-absorbing web;

[0046] The mass ratio of PE / PET composite fibers in the base fabric is 3:2; the mass ratio of modified polylactic acid fibers and modified composite fibers in the moisture-absorbing web is 4:1;

[0047] S5: laminating and combing the base fabric web and the moisture-absorbing web in a ratio of 1:1, and performing hot air treatment to obtain a composite non-woven fabric with high absorption performance; the working conditions of the hot air treatment are: a temperature of 125°C.

[0048] Example 2: A method for preparing a composite nonwoven fabric with high absorption performance, comprising the following steps:

[0049] S1: mixing the composite organic framework, chitosan, dopamine hydrochloride, and Tris-HCl buffer solution to obtain an antibacterial impregnation solution;

[0050] The composition of the antibacterial impregnation solution is as follows: 200 mL of 0.1 mol / L Tris-HCl buffer solution as solvent, containing 0.5 g of composite organic framework, 10 g of modified chitosan, and 10 g of dopamine hydrochloride, with a solution pH of 8.5;

[0051] The preparation of the composite organic framework includes the following steps:

[0052] 1) 2 mmol of 2-aminoterephthalic acid, 9 mL of N,N-dimethylformamide, and 1 mL of methanol were mixed, 1.33 mmol of tetrabutyl titanate was added, and the mixture was stirred for 25 min. 1.67 mL of glacial acetic acid was added and stirred for 25 min. The mixture was kept at 150°C for 23 h, washed, centrifuged, and dried to obtain a titanium-based organic framework.

[0053] 2) 1 g of titanium-based organic framework, 1 mmol of copper nitrate, 10 mL of deionized water, and 10 mL of ethanol were mixed, 1 mmol of urea was added, and the mixture was stirred for 20 min. The mixture was kept at 130°C for 24 h, washed, and dried to obtain a composite organic framework;

[0054] S2: The preparation of composite sodium alginate fiber includes the following steps:

[0055] Sodium alginate, gelatin, composite organic framework, and deionized water were mixed and stirred to form a shell solution; eugenol and Tween 80 were mixed and emulsified, and polyethylene oxide and deionized water were added and ultrasonically stirred to form a core solution; composite sodium alginate fibers were prepared by coaxial electrospinning;

[0056] The shell layer solution was composed of 3 g of sodium alginate, 3 g of gelatin, and 0.08 g of the composite organic framework in 100 mL of deionized water. The core layer solution was composed of 1.5 g of eugenol, 0.2 g of Tween 80, and 3 g of polyethylene oxide in 100 mL of deionized water.

[0057] The working conditions of coaxial electrospinning were: positive voltage 18 kV, negative voltage -2 kV, shell flow rate 0.3 mm / min, core flow rate 0.15 mm / min, receiving distance 25 cm, translation speed 300 mm / min, temperature 25 °C, relative humidity 40%-50%;

[0058] S3: immersing the polylactic acid fiber and the composite sodium alginate fiber in an antibacterial impregnation solution to obtain modified polylactic acid fiber and modified composite fiber;

[0059] S4: Blending the PE / PET composite fiber and the modified polylactic acid fiber by opening, combing, and obtaining a base fabric web; Blending the modified polylactic acid fiber and the modified composite fiber by opening, combing, and obtaining a moisture-absorbing web;

[0060] The mass ratio of PE / PET composite fibers in the base fabric is 3:2; the mass ratio of modified polylactic acid fibers and modified composite fibers in the moisture-absorbing web is 4:1;

[0061] S5: laminating and combing the base fabric web and the moisture-absorbing web in a ratio of 1:1, and performing hot air treatment to obtain a composite non-woven fabric with high absorption performance; the working conditions of the hot air treatment are: a temperature of 130°C.

[0062] Example 3: A method for preparing a composite nonwoven fabric with high absorption performance, comprising the following steps:

[0063] S1: mixing the composite organic framework, chitosan, dopamine hydrochloride, and Tris-HCl buffer solution to obtain an antibacterial impregnation solution;

[0064] The composition of the antibacterial impregnation solution is as follows: 200 mL of 0.1 mol / L Tris-HCl buffer solution as solvent, containing 0.5 g of composite organic framework, 10 g of modified chitosan, and 10 g of dopamine hydrochloride, with a solution pH of 8.6;

[0065] The preparation of the composite organic framework includes the following steps:

[0066] 1) 2 mmol of 2-aminoterephthalic acid, 9 mL of N,N-dimethylformamide, and 1 mL of methanol were mixed, 1.33 mmol of tetrabutyl titanate was added, and the mixture was stirred for 30 min. 1.67 mL of glacial acetic acid was added and stirred for 30 min. The mixture was kept at 150°C for 24 h, washed, centrifuged, and dried to obtain a titanium-based organic framework.

[0067] 2) 1 g of titanium-based organic framework, 1 mmol of copper nitrate, 10 mL of deionized water, and 10 mL of ethanol were mixed, 1 mmol of urea was added, and the mixture was stirred for 20 min. The mixture was kept at 130°C for 24 h, washed, and dried to obtain a composite organic framework;

[0068] S2: The preparation of composite sodium alginate fiber includes the following steps:

[0069] Sodium alginate, gelatin, composite organic framework, and deionized water were mixed and stirred to form a shell solution; eugenol and Tween 80 were mixed and emulsified, and polyethylene oxide and deionized water were added and ultrasonically stirred to form a core solution; composite sodium alginate fibers were prepared by coaxial electrospinning;

[0070] The shell layer solution was composed of 5 g of sodium alginate, 5 g of gelatin, and 0.1 g of the composite organic framework in 100 mL of deionized water. The core layer solution was composed of 2 g of eugenol, 0.3 g of Tween 80, and 5 g of polyethylene oxide in 100 mL of deionized water.

[0071] The working conditions of coaxial electrospinning were: positive voltage 18 kV, negative voltage -2 kV, shell flow rate 0.3 mm / min, core flow rate 0.15 mm / min, receiving distance 25 cm, translation speed 300 mm / min, temperature 25 °C, relative humidity 40%-50%;

[0072] S3: immersing the polylactic acid fiber and the composite sodium alginate fiber in an antibacterial impregnation solution to obtain modified polylactic acid fiber and modified composite fiber;

[0073] S4: Blending the PE / PET composite fiber and the modified polylactic acid fiber by opening, combing, and obtaining a base fabric web; Blending the modified polylactic acid fiber and the modified composite fiber by opening, combing, and obtaining a moisture-absorbing web;

[0074] The mass ratio of PE / PET composite fiber to modified polylactic acid fiber in the base fabric is 3:2; the mass ratio of modified polylactic acid fiber to modified composite fiber in the moisture-absorbing web is 4:1;

[0075] S5: laminating and combing the base fabric web and the moisture-absorbing web in a ratio of 1:1, and performing hot air treatment to obtain a composite non-woven fabric with high absorption performance; the working conditions of the hot air treatment are: a heating temperature of 135°C.

[0076] Comparative Example 1: Taking Example 3 as the control group, direct electrospinning of sodium alginate was used to replace the composite sodium alginate fiber, that is, gelatin, composite organic framework, eugenol, Tween 80, and polyethylene oxide were not added, and other processes were normal.

[0077] Comparative Example 2: Example 3 was used as the control group, in which no composite organic framework was added to the antibacterial impregnation solution, and other processes were carried out normally.

[0078] Comparative Example 3: Example 3 was used as the control group, in which chitosan was not added to the antibacterial impregnation solution and other processes were carried out normally.

[0079] Comparative Example 4: Taking Example 3 as the control group, dopamine hydrochloride was not added to the antibacterial impregnation solution, and other processes were normal.

[0080] Comparative Example 5: Example 3 was used as the control group, in which no moisture absorbent web was prepared and other processes were carried out normally.

[0081] Sources of raw materials used:

[0082] PE / PET composite fiber (2D): Jiangsu Zhongshi Fiber Co., Ltd.; chitosan C804730, dopamine hydrochloride D806618, Tris-HCl buffer solution T917655, 2-aminoterephthalic acid A824727, N,N-dimethylformamide N807505, tetrabutyl titanate T818869, copper nitrate C805304, sodium alginate S817374, gelatin G6317, eugenol E809010, Tween 80 T818928, polyethylene oxide P823139, urea U820349: Shanghai MacLean Biochemical Technology Co., Ltd.; polylactic acid fiber (2D): Quanzhou St. Martin Import and Export Trading Co., Ltd.; methanol, glacial acetic acid, and ethanol (analytical grade): Sinopharm Group reagents.

[0083] The thickness of the composite non-woven fabric in the embodiment and the comparative example is 0.5 mm.

[0084] Performance testing:

[0085] Tensile properties: The test was conducted using an electronic fabric strength tester. The sample was cut into 200mm×50mm, the clamping distance was 200mm, the tensile speed was 100mm / min, and the average value was taken after 5 measurements to obtain the longitudinal strength. Air permeability: The test was conducted using a fully automatic air permeability meter, referring to GB / T5453-1997, and the test area was 20cm. 2 , pressure drop of 200pa, test 5 times and take the average value, above 2000mm / s is excellent, 1200-2000 is qualified, excluding 2000; liquid penetration time: refer to GB / T24218.13-2010, use liquid penetrant to measure, test 5 times and take the average value, less than 2s is excellent, 2-5s is qualified, excluding 2s; dehumidification: refer to GB / T24218.14-2010, test 5 times and take the average value, less than 1g is excellent, 1-2.5g is qualified; antibacterial test: Gram-negative Escherichia coli and Staphylococcus aureus are used as test strains, and the plate method is used for testing; specific data are shown in Table 1;

[0086] Table 1

[0087]

[0088] The longitudinal strength of Examples 1-3 of the present invention is higher than 85.9, the air permeability is ≥2000 mm / s, the liquid penetration time is less than 2 seconds, and the liquid rewet volume is less than 1 g, indicating that the composite non-woven fabric prepared according to the present invention has high absorbency, high antibacterial properties, unidirectional moisture conductivity, biodegradability, and good mechanical properties.

[0089] By comparing Example 3 with Comparative Example 1, it can be seen that the sodium alginate fiber generated by single sodium alginate has the problems of poor mechanical properties and limited antibacterial properties. The present invention uses sodium alginate as the shell layer and polyethylene oxide as the core layer, and adopts coaxial electrospinning to prepare a composite sodium alginate fiber with a core-shell structure, thereby greatly improving the mechanical properties and antibacterial properties of the sodium alginate fiber; gelatin and a composite organic framework are introduced into the shell layer, which gives the shell layer higher antibacterial properties while enhancing the complexity of the shell layer cross-linking network, thereby having a toughening effect on the shell layer and greatly improving the absorbency of the shell layer structure; an emulsion of eugenol is introduced into the core layer, thereby improving the spinnability of polyethylene oxide and giving the core layer a natural antibacterial factor.

[0090] By comparing Example 3 with Comparative Example 2, it can be seen that in order to further improve the antibacterial properties and absorbability of polylactic acid fibers and composite sodium alginate fibers, an antibacterial impregnation solution is prepared using a composite organic framework, chitosan, and dopamine hydrochloride; 2-aminoterephthalic acid is used as a ligand to synthesize a titanium-based organic framework, and copper nitrate and urea are used to in situ grow layered hydroxides on the titanium-based organic framework, thereby improving the broad-spectrum antibacterial properties and mechanical toughness of the composite organic framework.

[0091] By comparing Example 3 with Comparative Examples 3 and 4, it can be seen that an aminoquinone network is formed between dopamine and chitosan, so that chitosan and the composite organic framework are firmly combined on the surface of polylactic acid and composite sodium alginate fibers, thereby greatly improving the antibacterial durability and biocompatibility of the composite non-woven fabric.

[0092] By comparing Example 3 with Comparative Example 5, it can be seen that in order to make the prepared non-woven fabric have unidirectional moisture conductivity when used as the surface layer of sanitary napkins, the components and content of the base fabric web and the moisture-absorbing web are controlled so that they are stacked and combed to form a composite fiber web with a gradient structure, which promotes unidirectional movement of liquid in the material, thereby greatly improving the dryness and breathability of the composite non-woven fabric and showing a lower rewet amount.

[0093] The above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the description of the present invention under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for preparing a composite nonwoven fabric with high absorption performance, characterized in that: The following steps are involved: S1: mixing the composite organic framework, chitosan, dopamine hydrochloride, and Tris-HCl buffer solution to obtain an antibacterial impregnation solution; S2: Composite sodium alginate fibers with a core-shell structure were prepared by coaxial electrospinning with sodium alginate as the shell layer and polyethylene oxide as the core layer; S3: respectively immersing the polylactic acid fiber and the composite sodium alginate fiber in an antibacterial impregnation solution to obtain modified polylactic acid fiber and modified composite sodium alginate fiber; S4: Blending the PE / PET composite fiber and the modified polylactic acid fiber by opening, combing, and obtaining a base fabric web; blending the modified polylactic acid fiber and the modified composite sodium alginate fiber by opening, combing, and obtaining a moisture-absorbing web; S5: laminating and combing the base fabric web and the moisture-absorbing web in a ratio of 1:1, and performing hot air treatment to obtain a composite nonwoven fabric with high absorption performance; The preparation of the composite organic framework includes the following steps: 1) Mix 2-aminoterephthalic acid, N,N-dimethylformamide, and methanol, add tetrabutyl titanate, stir for 20-30 minutes, add glacial acetic acid, stir for 20-30 minutes, keep warm at 150°C for 22-24 hours, wash, centrifuge, and dry to obtain a titanium-based organic framework; 2) Mix the titanium-based organic framework, copper nitrate, deionized water, and ethanol, add urea, stir for 20 minutes, keep at 130°C for 24 hours, wash, and dry to obtain a composite organic framework; The preparation of composite sodium alginate fiber includes the following steps: Sodium alginate, gelatin, composite organic framework, and deionized water were mixed and stirred to form a shell solution; eugenol and Tween 80 were mixed and emulsified, and polyethylene oxide and deionized water were added and ultrasonically stirred to form a core solution; composite sodium alginate fibers were prepared by coaxial electrospinning; The composition of the shell layer solution is: 100 mL of deionized water as solvent, containing 2-5 g of sodium alginate, 2-5 g of gelatin, and 0.05-0.1 g of a composite organic framework; the composition of the core layer solution is: 100 mL of deionized water as solvent, containing 1-2 g of eugenol, 0.1-0.3 g of Tween 80, and 2-5 g of polyethylene oxide.

2. The method for preparing a composite nonwoven fabric with high absorption performance according to claim 1, characterized in that: The composition of the antibacterial impregnation solution is as follows: 200 mL of 0.1 mol / L Tris-HCl buffer solution is used as a solvent, wherein the solvent contains 0.5 g of the composite organic framework, 10 g of chitosan, and 10 g of dopamine hydrochloride, and the pH value of the solution is 8.4-8.

6.

3. The method for preparing a composite nonwoven fabric with high absorption performance according to claim 1, characterized in that: The mass ratio of PE / PET composite fiber to modified polylactic acid fiber in the base fabric is 3:

2.

4. The method for preparing a composite nonwoven fabric with high absorption performance according to claim 1, characterized in that: The mass ratio of the modified polylactic acid fiber to the modified composite sodium alginate fiber in the moisture-absorbing web is 4:

1.

5. The method for preparing a composite nonwoven fabric with high absorption performance according to claim 1, characterized in that: The working conditions of hot air treatment are: temperature is 125-135℃.

6. The method for preparing a composite nonwoven fabric with high absorption performance according to claim 1, characterized in that: The working conditions of coaxial electrospinning were as follows: positive voltage 18 kV, negative voltage -2 kV, shell flow rate 0.3 mm / min, core flow rate 0.15 mm / min, receiving distance 25 cm, translation speed 300 mm / min, temperature 25 °C, and relative humidity 40%-50%.

7. A composite nonwoven fabric with high absorption performance, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 6.

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