Multi-order flow guide double-sided heterogeneous sanitary surface layer spunlace material and preparation method thereof

Abstract

The application discloses a multi-order flow guide double-face heterogeneous sanitary surface layer spunlace material and a preparation method thereof, and relates to the technical field of textile manufacturing. The preparation steps of the sanitary surface layer spunlace material are as follows: fiber raw materials are respectively subjected to opening, carding and cross-laying to obtain a front fiber web and a back fiber web; the front fiber web and the back fiber web are superposed in a mode that the front fiber web is on the top and the back fiber web is on the bottom; then, water jet reinforcement is performed; after reinforcement, finishing is performed; finally, drying and winding are performed to obtain the sanitary surface layer spunlace material; wherein the front fiber web is made of all-cotton fibers, and the grammage is 30-50 g / m 2 ; the back fiber web is made of mixed fibers, and the grammage is 40-60 g / m 2 ; and the back fiber web is obtained by mixing modified regenerated cellulose fibers, polyurethane fibers and bamboo pulp fibers in a mass ratio of (10-30):(5-10):100.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manufacturing textiles, in particular to a multi-order flow guiding double-sided heterogeneous sanitary surface layer spunlace material and a preparation method thereof. BACKGROUND

[0002] With the upgrading of health consumption concept and the fine development of sanitary product market, the short board of traditional sanitary materials in comfort, functionality and environmental protection is increasingly prominent; the early sanitary product surface layer is mostly made of hot air or spunbond non-woven fabric, which relies on chemical adhesives to reinforce fibers, although it has certain liquid absorption, but the liquid absorption is easy to form a large area of wetting area on the surface layer after the liquid absorption, which leads to a significant skin wet feeling, in addition, the technical contradiction of insufficient air permeability of synthetic fibers and loose structure of natural fibers, and the high dependence of traditional process on petrochemical raw materials, it is difficult to meet the multiple needs of consumers for "natural skin-friendly", "instant absorption and dryness" and "green low carbon"; although the existing multi-layer structure material (such as liquid absorption layer + flow guiding layer) optimizes the flow guiding performance through material combination, the interlayer bonding force is weak, the functional synergy is poor, and the flow guiding path design lacks gradient control, the transmission efficiency of liquid between layers is still limited by the porosity and wettability of the material itself;

[0003] Therefore, it is necessary to develop a multi-order flow guiding double-sided heterogeneous sanitary surface layer spunlace material. SUMMARY

[0004] The purpose of the present application is to provide a multi-order flow guiding double-sided heterogeneous sanitary surface layer spunlace material and a preparation method thereof to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A preparation method of a multi-order flow guiding double-sided heterogeneous sanitary surface layer spunlace material, comprising the following preparation steps: the fiber raw materials are respectively subjected to opening, carding and cross-laying to obtain a front fiber web and a back fiber web, then the front fiber web and the back fiber web are overlapped in a manner that the front surface is on the top and the back surface is on the bottom, and then water jet reinforcement is performed, after the reinforcement, finishing is performed, and finally drying and winding are performed to obtain a sanitary surface layer spunlace material;

[0007] Preferably, the water jet reinforcement adopts 1 pre-wetting, 3 front surface water jet and 2 back surface water jet, a total of 6 water jet processes; the water jet pressure in the pre-wetting water jet is 20-30bar; the water jet pressure in the front surface water jet is increased by 10-20bar according to a gradient of 10-20bar from an initial 40bar; the water jet pressure in the back surface water jet is 100bar, 80bar in turn;

[0008] Preferably, the front fiber web adopts all-cotton fibers, and the grammage is 30-50g / m 2 ; the back fiber web adopts mixed fibers, and the grammage is 40-60g / m 2; the mixed fibers are two or more of polylactic acid fiber, synthetic fiber, super cotton-like fiber, calcium alginate fiber, regenerated cellulose fiber, and modified regenerated cellulose fiber;

[0009] More preferably, the reverse fiber web is obtained by mixing modified regenerated cellulose fiber, polyurethane fiber, and bamboo pulp fiber at a mass ratio of (10-30):(5-10):100; the preparation steps of the modified regenerated cellulose fiber are as follows:

[0010] s1: dissolve calcium chloride in ethanol, add triethylamine and stir for 30 min, then drop phosphoric acid ethanol solution and stir for 12 h, centrifuge and wash to obtain calcium phosphate ion oligomer, mix the calcium phosphate ion oligomer with ethanol and glycerol, and ultrasonic dispersion for 10-20 min to obtain a coagulation liquid;

[0011] s2: disperse chitin into a-30℃ aqueous solution containing potassium hydroxide and urea, stir for 10-20 min at-30℃, add 2,3-epoxypropyltrimethylammonium chloride, react for 24 h at-10-0℃, dialysis, freeze-drying to obtain quaternary ammonium chitin, reflux the quaternary ammonium chitin with oxalic acid solution at 100-120℃ for 2-3 h, disperse in deionized water after washing, adjust the solution pH to 11 and stir for 1-2 h, wash and dry to obtain modified chitin, ultrasonic dispersion in deionized water for 20-30 min to obtain a modified chitin dispersion;

[0012] s3: disperse cellulose in a tetraethylammonium hydroxide aqueous solution, stir for 20-30 min, add the modified chitin aqueous dispersion, stir for 20-30 min, degas, jet extrude at a pressure of 0.2 MPa and place in the coagulation liquid, collect and dry, treat with water vapor for 10-15 min, and finally stretch to a diameter of 10-15 μm to obtain the modified regenerated cellulose fiber;

[0013] Preferably, the mass ratio of chitin to 2,3-epoxypropyltrimethylammonium chloride in s2 is 1:(2-3); the amount ratio of quaternary ammonium chitin to oxalic acid solution is 1 g:(20-30) mL; the sodium hydroxide in the aqueous solution containing sodium hydroxide and urea accounts for 15-20 wt% of the total system, and the urea accounts for 3-5 wt%;

[0014] Preferably, the amount ratio of cellulose to modified chitin aqueous dispersion in s3 is 1 g:(1.5-2) mL; the concentration of modified chitin in the modified chitin aqueous dispersion is 0.01-0.05%; and the concentration of calcium phosphate ion oligomer in the coagulation liquid is 10-30 mg / mL;

[0015] Preferably, the polyurethane fiber is made by electrospinning, and the spinning solution comprises the following ingredients by mass percentage: 15-20% thermoplastic polyurethane, 2-3% cetyltrimethylammonium bromide, and the balance N,N-dimethylformamide; the process parameters of electrospinning are as follows: spinning voltage is 40-45kV, receiving distance is 10-12cm, and the injection speed of the injector is 1.5-2mL / h;

[0016] Preferably, the finishing is carried out in a finishing solution by a two-dip-two-nip process with a bath ratio of 1: (30-50), the nip ratio is 80%, and after finishing, the material is taken out, pre-dried at 80 DEG C for 3min, and then dried at 180 DEG C for 5min;

[0017] Preferably, the finishing solution comprises: 10-20mg / L antibacterial microcapsules, 4-6g / L penetrant, 8-10% citric acid, and 2-3% sodium hypophosphite;

[0018] Preferably, the preparation steps of the antibacterial microcapsules are as follows: adding a surfactant into paraffin and stirring to obtain an oil phase, mixing sodium alginate and aloe-emodin powder in deionized water to obtain an aqueous phase, mixing and emulsifying the oil phase and the aqueous phase for 2h, then adding a chitosan acetic acid solution dropwise, adjusting the pH of the emulsion to 5, stirring for 2-3h, and then washing and vacuum drying to obtain the antibacterial microcapsules;

[0019] Preferably, the ratio of the aloe-emodin powder, sodium alginate and deionized water is (5-8) g: (4-6) g: 100mL;

[0020] A multi-stage flow guide double-sided heterogeneous sanitary surface layer spunlace material is prepared by the above preparation method.

[0021] Preferably, the above-mentioned sanitary surface layer spunlace material is provided with a dot matrix flow guide hole, a honeycomb water absorption core is arranged in the middle layer, and a PE leakage-proof film is arranged in the bottom layer to form a three-stage seepage protection system.

[0022] Preferably, the above-mentioned sanitary surface layer spunlace material is provided with a dot matrix flow guide hole, a honeycomb water absorption core is arranged in the middle layer, and a PE leakage-proof film is arranged in the bottom layer to form a three-stage seepage protection system.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] The surface layer water-jet material prepared by the application adopts a double-sided heterogeneous structure design, the front fiber web adopts all-cotton fibers, has a skin-friendly and low-sensitivity touch, and meanwhile retains the air permeability and moisture absorption brought by natural fibers; the back fiber web is composed of mixed fibers, enhances the flow guiding efficiency and structural support, and optimizes the liquid permeation path, realizes the differential functions of the two sides through the laminating and water-jet reinforcing technology, and optimizes the high-pressure water-jet technology to intertwine and reinforce the fibers without chemical adhesives, maintains the fiber strength, forms a stable pore structure, and is beneficial to the rapid absorption and diffusion of liquid.

[0025] The back fiber web is obtained by mixing bamboo pulp fibers and modified regenerated cellulose fibers and polyurethane fibers; the bamboo pulp fibers have excellent moisture absorption, are green and safe, and have certain antibacterial performance; the modified cellulose fibers are obtained by implementing a wet spinning process on regenerated cellulose composite modified chitin, and the calcium phosphate ion oligomers in the coagulation liquid are used to diffuse into the fibers to enhance the mechanical properties of the fibers; the calcium phosphate is rich in calcium ions and hydroxyl groups, and the chitin ester group is introduced into the chitin after oxalic acid acylation, the calcium ions can form a coordination bond with the carbonyl oxygen atoms of the chitin ester group, effectively improving the dispersion of chitin; and the thermoplastic polyurethane molecular chain of the subsequent electrospinning also has carbonyl oxygen atoms, and the calcium particles further improve the interfacial bonding strength between the mixed fibers in the composite fiber web; the chitin is treated by double modification, i.e., quaternization and oxalic acid acylation in sequence, the quaternization further improves the antibacterial performance of chitin, and at the same time improves the water solubility of chitin, and realizes good dispersion effect in the cellulose aqueous dispersion, the oxalic acid acylation improves the compatibility between chitin and cellulose, further optimizes the dispersion effect of chitin, and enhances the moisture absorption and water retention performance of the regenerated cellulose fibers; and the polyurethane fibers prepared by electrospinning have high porosity and good flexibility, and the addition of hydrophilic materials further improves the permeability of the overall surface layer material;

[0026] The application arranges the surface layer water-jet material after water-jet reinforcement, optimizes the fiber structure stability and moisture absorption and water retention; the finishing liquid adds antibacterial microcapsules, the antibacterial active substance aloe emodin in the antibacterial microcapsules is a natural source antibacterial material, is coated with sodium alginate and chitosan, improves the durability and long-term effect of the antibacterial agent in the fabric finishing; and the chitosan deposited on the sodium alginate microspheres is further cross-linked and solidified by cinnamaldehyde, improves the stability of the microcapsule particles, and the cinnamaldehyde has antibacterial and anti-inflammatory effects, the beta-aldehyde group in the structure has high activity, and occurs condensation reaction with the amino and hydroxyl groups in the composite fiber web in the finishing liquid, improves the adhesion of the antibacterial microcapsules on the fabric, and improves the utilization rate of the antibacterial product. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0028] In the experiment, the preparation steps of the antibacterial microcapsules are as follows: 5 mL of a surfactant Span 80 is uniformly stirred in 95 mL of paraffin to obtain an oil phase, 1.5 g of sodium alginate and 1.5 g of aloe emodin powder are mixed and stirred in 30 mL of deionized water to obtain an aqueous phase, the oil phase and the aqueous phase are mixed, emulsified and homogenized for 2 h, then 30 mL of a chitosan acetic acid solution with a mass fraction of 3% is added dropwise, the pH of the emulsion is adjusted to 5, 1 g of cinnamaldehyde is added and stirred for 3 h, and then the antibacterial microcapsules are obtained by washing and vacuum drying; wherein the concentration of the acetic acid solution is 3%;

[0029] The spinning solution of the polyurethane fiber comprises the following raw materials in percentage by mass: 15% of thermoplastic polyurethane, 3% of cetyltrimethylammonium bromide, and the balance of N,N-dimethylformamide; the process parameters of electrospinning are as follows: a spinning voltage of 45 kV, a receiving distance of 10 cm, and an injector advancing speed of 1.5 mL / h; wherein the thermoplastic polyurethane is model 90A and is purchased from Sinopharm Group;

[0030] The average diameter of the cotton fiber is 15 μm and is purchased from Xinjiang; the bamboo pulp fiber is 1.67 dtex x 38 mm and is purchased from Nanjing Lanjing Fiber Co., Ltd.;

[0031] The molecular weight of the chitin is 5 x 10 5 , which is purchased from Shanghai Bailingwei Chemical Co., Ltd.; the degree of deacetylation of the chitosan is greater than 85%, which is purchased from Jinan Haidebei Marine Biological Engineering;

[0032] The surfactant is Span 80, which is purchased from Shanghai Aladdin; the penetrant JFC is purchased from Hai'an Petroleum Chemical Industry;

[0033] Embodiment 1: The present embodiment provides a preparation method of a sanitary surface layer spunlace material, and the specific steps are as follows:

[0034] Step 1: The fiber raw materials are respectively subjected to opening, carding and cross-laying to obtain a front fiber web and a back fiber web, and then the front fiber web and the back fiber web are superimposed in a manner that the front fiber web is at the lower side and the back fiber web is at the upper side, and then water jet reinforcement is performed, wherein one pre-wetting, three front water jetting and two back water jetting are adopted, and a total of six water jetting processes are adopted; in the pre-wetting water jetting, the water jetting pressure is 20 bar; in the front water jetting, the water jetting pressure is initially 40 bar and is increased by 10 bar for each process according to a gradient; and in the back water jetting, the water jetting pressures are 100 bar and 80 bar, respectively;

[0035] Step 2: After water jet reinforcement, the finishing is carried out in the finishing liquid with a bath ratio of 1:50 by adopting the two-dip-two-pad process, the padding rate is 80%, and then the sanitary surface layer water jet material is obtained by taking out, pre-drying at 80℃ for 3 min, drying at 180℃ for 5 min, and winding;

[0036] The positive fiber web is made of all-cotton fibers, and the grammage is 50 g / m 2 The negative fiber web is obtained by mixing modified regenerated cellulose fibers, polyurethane fibers and bamboo pulp fibers according to a mass ratio of 25:8:100; the preparation steps of the modified regenerated cellulose fibers are as follows:

[0037] s1: 4.5 g of calcium chloride dihydrate is dissolved in 1 L of ethanol, 90 mL of triethylamine is added, stirred for 30 min, and then a volume ratio of 3:100 of phosphoric acid ethanol solution is added dropwise and stirred for 12 h. After centrifugation and washing, the calcium phosphate ion oligomer is obtained; the calcium phosphate ion oligomer is mixed with 60 mL of ethanol and 10 mL of glycerol, and ultrasonic dispersion is carried out for 20 min to obtain a coagulation liquid; the concentration of the calcium phosphate ion oligomer in the coagulation liquid is 10 g / mL;

[0038] s2: 5 g of chitin is dispersed in 500 mL of a water solution containing 15% potassium hydroxide and 3% urea pre-cooled at -30℃, and stirred at -30℃ for 20 min. 10 g of 2,3-epoxypropyltrimethylammonium chloride is added, and reacted at 0℃ for 24 h. After dialysis, freeze-drying is carried out to obtain quaternary ammonium chitin. 100 mL of a 25% oxalic acid solution is added to the quaternary ammonium chitin, and refluxed at 120℃ for 3 h. After washing, the solution is dispersed in deionized water, the pH of the solution is adjusted to 11 and stirred for 2 h, and then washed and dried to obtain modified chitin. The modified chitin is dispersed in 150 mL of deionized water by ultrasonic dispersion for 20 min to obtain a modified chitin dispersion liquid;

[0039] s3: 10 g of cellulose is placed in 120 mL of a 25% tetraethylammonium hydroxide aqueous solution, stirred for 30 min, and then 20 mL of the modified chitin aqueous dispersion liquid is added and stirred for 30 min. After degassing, it is extruded under a pressure of 0.2 MPa and placed in the coagulation liquid. After collection and drying, water vapor treatment is carried out for 15 min, and finally stretched to a diameter of 15 μm to obtain the modified regenerated cellulose fiber.

[0040] The finishing liquid includes 12 mg / L of antibacterial microcapsules, 5 g / L of penetrant, 8% citric acid, 2% sodium hypophosphite, and deionized water as the solvent.

[0041] Example 2: A method for preparing a sanitary surface layer water jet material is provided, and the specific steps are as follows:

[0042] Step 1: The fiber raw materials were respectively subjected to opening, carding and cross-laying to obtain a front fiber web and a back fiber web. The front fiber web and the back fiber web were stacked with the front surface downward and the back surface upward, and then were subjected to water jet reinforcement. A pre-wetting process, a front surface water jet process with 3 passes and a back surface water jet process with 2 passes were adopted, and a total of 6 passes were adopted. The water jet pressure in the pre-wetting process was 30 bar. The water jet pressure in the front surface water jet process was initially 40 bar, and was increased by 15 bar for each pass. The water jet pressure in the back surface water jet process was 100 bar and 80 bar, respectively.

[0043] Step 2: After the water jet reinforcement, a two-dip-two-nip process was adopted in the finishing liquid with a bath ratio of 1:50. The rolling rate was 80%, and then the material was taken out, pre-dried at 80°C for 3 min, dried at 180°C for 5 min, and wound to obtain a sanitary surface layer water jet material.

[0044] The front fiber web was made of cotton fibers with a grammage of 50 g / m 2 The back fiber web was obtained by mixing modified regenerated cellulose fibers, polyurethane fibers and bamboo pulp fibers according to a mass ratio of 25:8:100. The preparation steps of the modified regenerated cellulose fibers were as follows:

[0045] s1: 4.5 g of calcium chloride dihydrate was dissolved in 1 L of ethanol, 90 mL of triethylamine was added and stirred for 30 min, then a volume ratio of 3:100 of phosphoric acid ethanol solution was added and stirred for 12 h, centrifuged and washed to obtain calcium phosphate ion oligomers; the calcium phosphate ion oligomers were mixed with 60 mL of ethanol and 10 mL of glycerol, and ultrasonic dispersion was performed for 20 min to obtain a coagulation liquid; the concentration of calcium phosphate ion oligomers in the coagulation liquid was 15 g / mL;

[0046] s2: 5 g of chitin was dispersed in 500 mL of a water solution containing 15% potassium hydroxide and 3% urea pre-cooled at -30°C, stirred for 10 min at -30°C, 12 g of 2,3-epoxypropyltrimethylammonium chloride was added, reacted at 0°C for 24 h, dialyzed, freeze-dried to obtain quaternary ammonium chitin, 120 mL of a 25% oxalic acid solution was added, and 5 g of the quaternary ammonium chitin was refluxed at 120°C for 2 h, washed, dispersed in deionized water, the solution pH was adjusted to 11 and stirred for 1-2 h, washed and dried to obtain modified chitin, which was ultrasonically dispersed in 150 mL of deionized water for 30 min to obtain a modified chitin dispersion;

[0047] s3: 10 g of cellulose was placed in 120 mL of a 25% tetraethylammonium hydroxide aqueous solution, stirred for 30 min, 20 mL of the modified chitin aqueous dispersion was added, stirred for 30 min, degassed, extruded under a pressure of 0.2 MPa, and placed in the coagulation liquid, collected, dried, treated with steam for 15 min, and finally stretched to a diameter of 15 μm to obtain the modified regenerated cellulose fibers;

[0048] The finishing liquid comprises 12 mg / L antibacterial microcapsules, 5 g / L penetrant, 10% citric acid, 2% sodium hypophosphite, and deionized water as the solvent.

[0049] Embodiment 3: Embodiment 1: The present embodiment provides a preparation method of a sanitary surface layer spunlace material, and the specific steps are as follows:

[0050] Step 1: The fiber raw materials are respectively subjected to opening, carding and cross-laying to obtain a front fiber web and a back fiber web. The front fiber web and the back fiber web are superimposed in a manner that the front surface is at the lower side and the back surface is at the upper side, and then water jet reinforcement is performed. The water jet reinforcement adopts one pre-wetting, three front surface water jetting and two back surface water jetting, that is, a total of six water jetting processes. The water jet pressure in the pre-wetting water jetting is 30 bar. The water jet pressure in the front surface water jetting is initially 40 bar, and is increased by 20 bar for each process according to a gradient. The water jet pressure in the back surface water jetting is 100 bar, 80 bar and 80 bar in sequence.

[0051] Step 2: After the water jet reinforcement, the two-dip-two-roll process is adopted to finish in the finishing liquid according to a bath ratio of 1:50. The roll-off rate is 80%. After being taken out, pre-drying is performed at 80℃ for 3 min, and then drying is performed at 180℃ for 5 min. Finally, the sanitary surface layer spunlace material is obtained by winding.

[0052] The front fiber web adopts all-cotton fibers, and the grammage is 50 g / m 2 The back fiber web is obtained by mixing modified regenerated cellulose fibers, polyurethane fibers and bamboo pulp fibers according to a mass ratio of 30:10:100. The preparation steps of the modified regenerated cellulose fibers are as follows:

[0053] s1: 4.5 g of calcium chloride dihydrate is dissolved in 1 L of ethanol, 90 mL of triethylamine is added, stirred for 30 min, and then a volume ratio of 3:100 of phosphoric acid ethanol solution is added and stirred for 12 h. After centrifugation and washing, calcium phosphate ion oligomers are obtained. The calcium phosphate ion oligomers are mixed with 60 mL of ethanol and 10 mL of glycerol, and ultrasonic dispersion is performed for 20 min to obtain a coagulation liquid. The concentration of the calcium phosphate ion oligomers in the coagulation liquid is 20 g / mL.

[0054] s2: 5 g of chitin is dispersed in 500 mL of a water solution containing 15% potassium hydroxide and 3% urea pre-cooled at -30℃, stirred for 20 min at -30℃, and then 12 g of 2,3-epoxypropyltrimethylammonium chloride is added. After reaction at 0℃ for 24 h, dialysis is performed, and freeze-drying is performed to obtain quaternary ammonium chitin. 120 mL of a 25% oxalic acid solution is added, and then 5 g of the quaternary ammonium chitin is refluxed at 120℃ for 3 h. After washing, the quaternary ammonium chitin is dispersed in deionized water, the pH of the solution is adjusted to 11, and stirring is performed for 2 h. After washing and drying, the modified chitin is obtained. The modified chitin is ultrasonically dispersed in 150 mL of deionized water for 30 min to obtain a modified chitin dispersion liquid.

[0055] s3: 10 g of cellulose was placed in 120 mL of a 25% by mass aqueous solution of tetraethylammonium hydroxide, stirred for 30 min, 20 mL of the modified chitin aqueous dispersion was added, stirred for 30 min, defoamed, extruded by spinning under a pressure of 0.2 MPa, and placed in a coagulation liquid, collected, dried, treated with water vapor for 15 min, and finally stretched to a diameter of 15 μm to obtain the modified regenerated cellulose fiber;

[0056] The finishing liquid comprises 15 mg / L of antibacterial microcapsules, 6 g / L of a penetrant, 10% of citric acid, 3% of sodium hypophosphite, and deionized water as a solvent.

[0057] Comparative Example 1: As a control experiment of Example 3, no modified chitin dispersion was added to the modified regenerated cellulose fiber; the specific steps are as follows:

[0058] Step 1: The fiber raw materials were respectively opened, carded, and cross-laid to obtain a front fiber web and a back fiber web. After the front fiber web was stacked on the back fiber web, water jet reinforcement was performed in the following manner: pre-wetting 1 pass, front 3 passes, back 2 passes, a total of 6 passes. The water jet pressure in the pre-wetting pass was 30 bar. The water jet pressure in the front passes was initially 40 bar and was increased by 20 bar in each pass. The water jet pressure in the back passes was 100 bar and 80 bar, respectively.

[0059] Step 2: After water jet reinforcement, the material was finished in the finishing liquid by a two-dip-two-nip process at a bath ratio of 1:50. The nip ratio was 80%, and the material was taken out, pre-dried at 80°C for 3 min, and then dried at 180°C for 5 min. Finally, the sanitary surface layer water jet material was obtained by winding.

[0060] The front fiber web was made of 100% cotton fibers with a grammage of 50 g / m 2 The back fiber web was made of modified regenerated cellulose fiber, polyurethane fiber, and bamboo pulp fiber at a mass ratio of 30:10:100. The preparation steps of the modified regenerated cellulose fiber were as follows:

[0061] s1: 4.5 g of calcium chloride dihydrate was dissolved in 1 L of ethanol, 90 mL of triethylamine was added, stirred for 30 min, and then 3:100 volume ratio of phosphoric acid ethanol solution was added dropwise and stirred for 12 h. After centrifugation and washing, calcium phosphate ion oligomers were obtained. The calcium phosphate ion oligomers were mixed with 60 mL of ethanol and 10 mL of glycerol, and ultrasonic dispersion was performed for 20 min to obtain a coagulation liquid. The concentration of calcium phosphate ion oligomers in the coagulation liquid was 20 g / mL.

[0062] s2: 10 g of cellulose was placed in 120 mL of a 25% mass fraction of a tetraethylammonium hydroxide aqueous solution, stirred for 30 min, degassed, spun extruded at a pressure of 0.2 MPa, and placed in a coagulation liquid, collected, dried, treated with steam for 15 min, and finally stretched to a diameter of 15 μm to obtain the modified regenerated cellulose fiber;

[0063] The finishing liquid comprises 15 mg / L of antibacterial microcapsules, 6 g / L of a penetrant, 10% citric acid, 3% sodium hypophosphite, and a solvent of deionized water.

[0064] Comparative Example 2: As a control experiment of Example 3, no aloe-emodin powder was added to the microcapsules in the finishing liquid, and the specific steps were as follows:

[0065] Step 1: The fiber raw materials were respectively opened, carded, and cross-laid to obtain a front fiber web and a back fiber web. After the front fiber web was stacked on the back fiber web, water jet reinforcement was performed in a pre-wetting 1 pass, 3 passes on the front, and 2 passes on the back, for a total of 6 passes. The water jet pressure in the pre-wetting water jet was 30 bar. The water jet pressure in the front water jet was initially 40 bar, and was increased by 20 bar for each pass according to a gradient. The water jet pressure in the back water jet was 100 bar and 80 bar, respectively.

[0066] Step 2: After water jet reinforcement, the material was finished in a finishing liquid according to a bath ratio of 1:50 by using a two-dip-two-nip process. The pick-up rate was 80%. After being taken out, the material was pre-dried at 80°C for 3 min, and then dried at 180°C for 5 min. Finally, the material was wound to obtain a sanitary surface layer water jet material.

[0067] The front fiber web was made of 100% cotton fibers with a grammage of 50 g / m 2 The back fiber web was obtained by mixing modified regenerated cellulose fibers, polyurethane fibers, and bamboo pulp fibers according to a mass ratio of 30:10:100. The preparation steps of the modified regenerated cellulose fibers were as follows:

[0068] s1: 4.5 g of calcium chloride dihydrate was dissolved in 1 L of ethanol, 90 mL of triethylamine was added, stirred for 30 min, and then 3:100 volume ratio of phosphoric acid ethanol solution was added dropwise and stirred for 12 h. After centrifugation and washing, calcium phosphate ion oligomers were obtained. The calcium phosphate ion oligomers were mixed with 60 mL of ethanol and 10 mL of glycerol, and ultrasonic dispersion was performed for 20 min to obtain a coagulation liquid. The concentration of calcium phosphate ion oligomers in the coagulation liquid was 20 g / mL.

[0069] s2: 5 g of chitin was dispersed into 500 mL of a water solution containing 15% potassium hydroxide and 3% urea pre-cooled at -30°C, stirred for 20 min at -30°C, 12 g of 2,3-epoxypropyl trimethyl ammonium chloride was added, and after reaction at 0°C for 24 h, dialysis was performed, and freeze-drying was performed to obtain quaternary ammonium chitin. 120 mL of a 25% oxalic acid solution was added to 5 g of the quaternary ammonium chitin, and reflux reaction was performed at 120°C for 3 h. After washing, the product was dispersed in deionized water, the pH of the solution was adjusted to 11, and stirring was performed for 2 h. After washing and drying, the product was dispersed in 150 mL of deionized water under ultrasonic dispersion for 30 min to obtain a modified chitin dispersion;

[0070] s3: 10 g of cellulose was placed in 120 mL of a 25% tetraethylammonium hydroxide aqueous solution, stirred for 30 min, and then 20 mL of the modified chitin aqueous dispersion was added and stirred for 30 min. After degassing, it was extruded under a pressure of 0.2 MPa and placed in a coagulation liquid. After collection and drying, water vapor treatment was performed for 15 min, and finally stretching was performed to a diameter of 15 μm to obtain the modified regenerated cellulose fiber.

[0071] The finishing liquid comprises 15 mg / L of microcapsules, 6 g / L of a penetrating agent, 10% citric acid, 3% sodium hypophosphite, and deionized water as a solvent.

[0072] Detection test

[0073] Reverse wetting amount test: The sanitary surface layer spunlace material prepared in Examples 1-3 and Comparative Examples 1-2 was tested according to the standard GB / T 24218.14. A sample of 100 mm x 100 mm was cut from each, and ten standard water absorption filter papers were placed under the sample. The liquid penetration test was performed three times according to GB / T 24218.13 using 0.9% sodium chloride solution. The average of the two penetration times was recorded. After the third penetration test, a 1.2 kg weight was placed on the sample and the filter papers for 2 min. After removing the weight, the weight of the filter papers was measured. The difference between the initial weight and the final weight was the reverse wetting amount. The data are recorded in Table 1.

[0074] Antibacterial performance test: The antibacterial performance of the sanitary surface layer spunlace material prepared in Examples 1-3 and Comparative Examples 1-2 was tested according to the standard GB / T 20944.3 using the shaking method. Escherichia coli and Staphylococcus aureus were used as test strains, and the antibacterial rate was recorded in Table 1.

[0075] Table 1

[0076]

[0077] Conclusion: From the above data, it can be seen that the penetration and absorption performance and antibacterial performance of the sanitary surface layer spunlace material prepared in Example 3 are better than those of Examples 1 and 2; for the optimal Example 3, the formulation of the modified cellulose fiber is adjusted in Comparative Example 1, without adding resistant chitin, the penetration and absorption performance decreases significantly; in Comparative Example 2, aloe emodin is not added in the microcapsule, and the antibacterial performance decreases significantly.

[0078] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, and that the application can be implemented in other particular forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A method for preparing a multi-order flow guide double-sided anisotropic sanitary facing spunlace material, characterized in that, The preparation steps include: the fiber raw material is respectively subjected to opening, carding and cross-laying to obtain a front fiber web and a back fiber web, the front fiber web and the back fiber web are superimposed with the front fiber web on the top and the back fiber web on the bottom, then water jet reinforcement is performed, after reinforcement, finishing is performed, finally drying and winding are performed to obtain a sanitary surface layer water jet material; The front side web employs all cotton fibers, with a grammage of 30-50 g / m 2 ; The reverse side fiber web adopts mixed fibers, and the grammage is 40-60 g / m 2 ; The back fiber web is obtained by mixing modified regenerated cellulose fiber, polyurethane fiber and bamboo pulp fiber according to a mass ratio of (10-30):(5-10):100; the preparation steps of the modified regenerated cellulose fiber are as follows: s1: calcium chloride is dissolved in ethanol, triethylamine is added and stirred for reaction for 30 min, then phosphoric acid ethanol solution is added dropwise and stirred for reaction for 12 h, centrifugation and washing are performed to obtain calcium phosphate ion oligomers, the calcium phosphate ion oligomers are mixed with ethanol and glycerol, and ultrasonic dispersion is performed for 10-20 min to obtain a coagulation liquid; s2: chitin is dispersed into a water solution containing potassium hydroxide and urea at-30 DEG C, stirring is performed at-30 DEG C for 10-20 min, 2,3-epoxypropyltrimethylammonium chloride is added, reaction is performed at-10-0 DEG C for 24 h, dialysis is performed, freeze drying is performed to obtain quaternary ammonium chitin, oxalic acid solution is refluxed with the quaternary ammonium chitin at 100-120 DEG C for 2-3 h, washing is performed, then the quaternary ammonium chitin is dispersed in deionized water, the solution pH is adjusted to 11 and stirring is performed for 1-2 h, then washing and drying are performed to obtain modified chitin, ultrasonic dispersion is performed in deionized water for 20-30 min to obtain a modified chitin dispersion liquid; s3: cellulose is placed in a tetraethylammonium hydroxide aqueous solution and stirred for 20-30 min, then the modified chitin aqueous dispersion liquid is added and stirred for 20-30 min, defoaming is performed, jet extrusion is performed under a pressure of 0.2 MPa and in the coagulation liquid, collection and drying are performed, water vapor treatment is performed for 10-15 min, and finally stretching is performed to a diameter of 10-15 mu m to obtain the modified regenerated cellulose fiber.

2. The preparation method of the multi-order guide flow double-sided heterogeneous sanitary surface layer spunlace material according to claim 1, characterized in that: The water jet reinforcement adopts 1 pre-wetting, 3 front water jets and 2 back water jets, a total of 6 water jet processes; the pre-wetting water jet pressure is 20-30 bar; the front water jet pressure is initially 40 bar and is increased by 10-20 bar for each process; the back water jet pressure is 100 bar and 80 bar in turn.

3. The preparation method of the multi-order guide flow double-sided heterogeneous sanitary surface layer spunlace material according to claim 1, characterized in that, In s2, the mass ratio of chitin to 2,3-epoxypropyltrimethylammonium chloride is 1:(2-3); the dosage ratio of quaternary ammonium chitin to oxalic acid solution is 1 g:(20-30) mL; the sodium hydroxide accounts for 15-20 wt% and the urea accounts for 3-5 wt% in the water solution containing sodium hydroxide and urea.

4. The preparation method of the multi-order guide flow double-sided heterogeneous sanitary surface layer spunlace material according to claim 1, characterized in that, In s3, the dosage ratio of cellulose to the modified chitin aqueous dispersion liquid is 1 g:(1.5-2) mL; the concentration of the modified chitin in the modified chitin aqueous dispersion liquid is 0.01-0.05%; and the concentration of the calcium phosphate ion oligomers in the coagulation liquid is 10-30 mg / mL.

5. The preparation method of the multi-order guide flow double-sided heterogeneous sanitary surface layer spunlace material according to claim 1, characterized in that, The polyurethane fiber is made by electrospinning, and the spinning solution comprises the following raw materials in percentage by mass: 15-20% thermoplastic polyurethane, 2-3% cetyltrimethylammonium bromide, and the balance N,N-dimethylformamide; the process parameters of electrospinning are as follows: spinning voltage 40-45kV, receiving distance 10-12cm, and injector advancing speed 1.5-2mL / h.

6. The method for preparing a multi-stage flow-guiding, double-sided anisotropic sanitary surface hydroentangled material according to claim 1, characterized in that, The finishing is carried out in a finishing solution by a two-dip-two-nip process with a bath ratio of 1: (30-50), a nip ratio of 80%, and pre-drying at 70-80℃ for 3min after finishing, and drying at 150-180℃ for 3-5min; the finishing solution comprises: 10-20mg / L antibacterial microcapsules, 4-6g / L penetrant, 8-10% citric acid, and 2-3% sodium hypophosphite.

7. The method according to claim 6, wherein the method is characterized by the steps of: The preparation steps of the antibacterial microcapsules are as follows: adding a surfactant into paraffin and stirring to obtain an oil phase, mixing sodium alginate and aloe-emodin powder in deionized water to obtain an aqueous phase, mixing and emulsifying the oil phase and the aqueous phase for 2h, adding a chitosan acetic acid solution dropwise, adjusting the pH of the emulsion to 5, adding cinnamyl aldehyde and stirring for 2-3h, rinsing, and vacuum drying to obtain the antibacterial microcapsules.

8. The method for preparing a multi-stage flow-guiding, double-sided anisotropic sanitary surface hydroentangled material according to claim 7, characterized in that, The aloe-emodin powder, sodium alginate, and deionized water are used in a ratio of (5-8) g: (4-6) g: 100mL.

9. A multi-order flow guiding double-sided anisotropic sanitary facing hydroentangled material, characterized by Prepared by the preparation method of any one of claims 1-8. Prepared by the preparation method of any one of claims 1-8.

Images