One-way moisture-conducting non-woven fabric containing high-activity probiotics

Abstract

The invention relates to the technical field of disposable hygienic products, in particular to a one-way moisture conducting non-woven fabric containing high-activity probiotics, the one-way moisture conducting non-woven fabric sequentially comprises a film forming layer, a hydrophilic layer, a carding layer and a reverse osmosis layer, raw materials of the film forming layer comprise a dried high-activity probiotics coating, raw materials of the hydrophilic layer only comprise hydrophilic materials, the carding layer is made of hot-air non-woven fabric materials, and the reverse osmosis layer is made of hot-air non-woven fabric materials. Raw materials of the reverse osmosis layer simultaneously comprise a hydrophilic material and a hydrophobic material. The non-woven fabric has the characteristics of promoting rapid infiltration and efficiently preventing reverse osmosis, and can be applied to disposable hygienic products such as sanitary napkins, paper diapers, incontinence products, nursing pads and the like. The problems that a conventional non-woven fabric is slow in infiltration and poor in reverse osmosis prevention effect are solved.

Description

Technical Field

[0001] The invention relates to the technical field of disposable sanitary products, in particular to a unidirectional moisture-conducting nonwoven fabric containing highly active probiotics. Background Art

[0002] At present, the commonly used non-woven fabric preparation processes for disposable sanitary products include hot air, spunbond, spunlace, meltblown and other processes. Traditional non-woven fabric forming processes and technologies can only meet the needs of some consumers for products. The one-way moisture conduction function allows liquid to be quickly transferred from the inner layer of the fabric to the outer layer, and prevents liquid from back-osmosis from the outer layer to the inner layer. The method to achieve this function is mainly to reasonably configure fiber raw materials and fabric structures with different components, and hydrophobic materials and hydrophilic materials form a wetting gradient, thereby promoting one-way moisture conduction. In order to further enhance its moisture conduction performance, post-finishing processes or functional additives are also used in industrial processing to form differences in hygroscopicity of non-woven fabrics. However, this one-way moisture conduction non-woven fabric has low comfort and durability, and the effect of preventing back-osmosis in practical applications is poor, so it is not suitable for use in disposable sanitary products. Summary of the invention

[0003] In view of the above problems, the present invention provides a unidirectional moisture-conducting nonwoven fabric containing highly active probiotics.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows: A unidirectional moisture-conducting nonwoven fabric containing highly active probiotics comprises a film-forming layer, a hydrophilic layer, a combing layer and a reverse osmosis layer in sequence, wherein the raw material of the film-forming layer comprises an air-dried high-active probiotic suspension coating, the raw material of the hydrophilic layer comprises only hydrophilic material, the combing layer is a hot air nonwoven fabric material, and the raw material of the reverse osmosis layer comprises both hydrophilic material and hydrophobic material.

[0005] The highly active probiotic suspension contains: 0.1% to 1% of highly active probiotics, 5% to 15% of natural lactic acid-potassium lactate conjugate extract, 1% to 5% of carboxymethyl chitosan, and deionized water. The natural lactic acid-potassium lactate conjugate extract is conducive to the growth of probiotics and maintains the activity of probiotics; carboxymethyl chitosan, as a natural hydrophilic polymer material, on the one hand utilizes its chelating properties to form a stable complex of highly active probiotics on the surface of the hydrophilic layer, and on the other hand has excellent hydrophilic properties. In a liquid-soaked environment, on the one hand, it quickly releases probiotics, and at the same time, as an auxiliary agent, it improves the hydrophilic properties of the hydrophilic layer and promotes the rapid infiltration of the liquid into the hydrophilic layer.

[0006] Furthermore, the highly active probiotics include one or more of Lactobacillus acidophilus, Lactobacillus bulgaricus, Lactobacillus pseudocasei, Lactobacillus fermentum, Lactobacillus rhamnosus, Bifidobacterium bifidum, and Bifidobacterium longum.

[0007] The hydrophilic material is a hydrophilic high molecular polymer, specifically polyvinyl alcohol (PVA), polyethylene glycol (PEG) or polyvinyl pyrrolidone (PVP); or a hydrophilic high molecular material, specifically cellulose, alginate or protein; the porosity of the hydrophilic material is 10% to 30%.

[0008] The porosity of the carding layer is 30%-40%.

[0009] Furthermore, the mass ratio of the hydrophilic material to the hydrophobic material of the reverse osmosis layer is 3-5:5-7, and the porosity is 40% to 60%.

[0010] The method for preparing a one-way moisture-conducting nonwoven fabric containing highly active probiotics is characterized by being implemented according to the following steps: S1: hot air nonwoven fabric is made by hot air process as the base layer; S2: preparing a spinning solution from a hydrophilic material, and spinning on the front side of a hot air nonwoven fabric using an electrospinning machine; S3: preparing a spinning solution from a mixture of a hydrophobic material and a hydrophilic material, and spinning on the back of a hot air nonwoven fabric using an electrospinning machine; S4: vacuum drying the nonwoven fabric obtained in step 3; S5: The highly active probiotic suspension is applied onto the hydrophilic layer by a high-precision coating method, and then air-dried to form a film-forming layer.

[0011] In step S5, the preparation method of the high-activity probiotic suspension is: take high-activity probiotics, natural lactic acid-potassium lactate conjugate extract, carboxymethyl chitosan, and deionized water to prepare a suspension, use a high-speed multifunctional mixer to fully and evenly mix the above raw materials, and the liquid is clear. The speed of the high-speed multifunctional mixer is 1000r / min.

[0012] The non-woven fabric has a gram weight of 10g / ㎡-50g / ㎡. By reversely controlling the proportion of hydrophilic materials in the hydrophilic layer and the reverse osmosis layer to decrease in sequence, and positively controlling the porosity of the hydrophilic layer and the reverse osmosis layer to increase in sequence, the non-woven fabric has excellent unidirectional rapid moisture conduction performance: In terms of hydrophilicity: hydrophilic layer > reverse osmosis layer; In terms of porosity: hydrophilic layer < reverse osmosis layer.

[0013] Through the combination of layers, the small pore layer is more hydrophilic than the large pore layer, and the liquid is quickly absorbed. The small pores will absorb the liquid from the large pores, and the siphon effect will cause the liquid to flow unidirectionally to the hydrophilic layer. Ultimately, a self-pumping reaction of upward discharge against gravity is achieved.

[0014] A one-way moisture-conducting nonwoven fabric containing highly active probiotics, which has the characteristics of promoting rapid infiltration and effectively preventing reverse osmosis, and can be used in sanitary napkins, diapers, incontinence products, nursing pads and other disposable sanitary products. It solves the problem of slow infiltration and poor reverse osmosis prevention effect of conventional nonwoven fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a unidirectional moisture-conducting nonwoven fabric containing highly active probiotics.

[0016] Among them, there are a film-forming layer 1, a hydrophilic layer 2, a combing layer 3, and a reverse osmosis layer 4. DETAILED DESCRIPTION

[0017] Example 1: This example provides a method for preparing a unidirectional moisture-conducting non-woven fabric containing highly active probiotics.

[0018] 1. Experimental Preparation 1. Experimental equipment ① No less than 3 laboratory beakers; ② One electronic scale (accurate to 0.1g); ③1 desktop ion blower ④ 1 high-speed multifunctional mixer; ⑤ One spray-type electrospinning machine; ⑥ Ultrasonic oscillator 1 set; ⑦ One high-precision coating machine; ⑧1 constant temperature drying box; ⑨ 1 pipette; ⑩ A little menstrual blood simulation fluid (prepared with reference to the standard synthetic test solution formula for sanitary napkin penetration performance test GBT8939-2018); ⑪ 1 burette; 2. Raw material preparation ① Appropriate amount of dimethylacetamide DMAC; Film-forming layer: ②Deionized water: 94% ③Highly active probiotics: 0.1% ④Natural lactic acid-potassium lactate conjugate extract: 5% ⑤Carboxymethyl chitosan: 1% Hydrophilic layer: ⑥ Cellulose; Combing Layer: ⑦1.2D hot air non-woven fabric, 10g / ㎡; Reverse osmosis layer: ⑧ Polylactic acid PLA: cellulose = 7:3; 2. Experimental process The method for preparing a one-way moisture-conducting nonwoven fabric containing highly active probiotics is characterized by being implemented according to the following steps: S1: Through the hot air process, 1.2D-1.5D ES fibers are combed and formed to obtain hot air non-woven fabrics with a gram weight of 8g / ㎡-12g / ㎡ and a porosity of 30%-40%, which is used as the base layer; S2: Add cellulose to dimethylacetamide DMAC, stir at 80r / min for 12h to obtain a cellulose spinning solution with a solute ratio of 15%, use an ultrasonic oscillator to oscillate the spinning solution at 28KHZ for 40min, remove excess vacuoles, and keep them for later use, then use an electrospinning machine to spin on the front side of the hot air non-woven fabric, use a No. 18 needle, set the voltage value to 10kv-12kv, and the feed rate to 0.6ml / h, and spin on the front side of the carding layer for 8h to obtain a hydrophilic layer covering the front side of the carding layer; S3: The hydrophobic material is polylactic acid PLA, and the polylactic acid PLA is added to dimethylacetamide DMAC, and stirred at 80r / min for 12h to obtain a polylactic acid PLA spinning solution with a solute ratio of 15%, and mixed with a 15% cellulose spinning solution at a mass ratio of 7:3, and the spinning solution is vibrated by an ultrasonic oscillator at 28KHZ for 40min to remove excess vacuoles and keep them for later use, and then an electrospinning machine is used to spin on the back of the hot air non-woven fabric, using a No. 18 needle, setting the voltage value to 16kv-18kv, and a feed rate of 0.6ml / h, and spinning is performed on the quilt surface of the carding layer for 4h to obtain a reverse osmosis layer covering the back of the carding layer; S4: The nonwoven fabric obtained in step 3 is vacuum dried at a temperature of 55±0.5°C and a drying time of 24h.

[0019] S5: The high-activity probiotic suspension is coated on the hydrophilic layer at a speed of 80m / min through a high-precision coating machine with an accuracy of ≤1%, and then air-dried using a desktop ion blower to form a film-forming layer with an air volume of 80CFM~100CFM.

[0020] 3. Testing process Description: The one-way moisture-conducting nonwoven fabric containing highly active probiotics described in the present invention can be used in the field of disposable sanitary products. In combination with the relevant standards for disposable sanitary products, the test methods refer to "GB 15979-2024 Hygiene requirements for disposable sanitary products", "GB / T 24218.8 Textile nonwoven fabric test methods Part 8 Determination of liquid penetration time (simulated urine)", "GB / T8939-2018 Sanitary napkins (pads)", "Disinfection Technical Specifications" 2002 edition, etc.

[0021] Test 1: One-way moisture permeability test 1) The front side of the prepared non-woven fabric is named as side A, and the back side is named as side B; 2) Cut out two pieces of material of equal size from the prepared material. The test groups are group 1: A1 through B1; group 2: B2 through A2; 3) Group 1: A1 side facing up, B1 side facing down. Use a pipette to take 1 ml of menstrual blood simulation liquid, release the liquid on the A1 side, observe the A1 and B1 sides, and record the phenomenon; 4) Group 2: B2 side facing up, A2 side facing down. Use a pipette to take 1 ml of menstrual blood simulation liquid, release the liquid on the B2 side, observe the A1 and A2 sides, and record the phenomenon.

[0022] 5) Repeat steps 2-4 10 times and get the following test results: Test 2: Liquid penetration time test Refer to GB / T 24218.8 Textiles - Test methods for nonwoven fabrics - Part 8: Determination of liquid penetration time (simulated urine) and use the instruments specified in GB / T 24218.8.

[0023] 1) Prepare 10 samples of the nonwoven fabric of the present invention as the test sample, 10 samples of hot air nonwoven fabric (control group 1), and 10 samples of spunlace nonwoven fabric (control group 2), with a size of 125 mm x 125 mm; 88 g of dust-free paper, 100 mm x 100 mm; 2) Place 5 layers of 88g dust-free paper flat on the substrate, and then place a sample flat on the standard absorbent pad with the hydrophilic layer of the non-woven fabric facing up; 3) Place the penetration disk on the sample, with the center of the disk overlapping the center of the sample. The centers of the burette and funnel are both above the center of the penetration disk; 4) Adjust the height of the funnel so that its tip is located 5 ± 0.5 mm above the circular cavity of the penetration disk, that is, 30 mm above the sample; 5) Connect the electrodes to the electronic timer, turn on the electronic timer and set the display to zero; 6) Add simulated urine to the burette, close the drain valve of the funnel, and allow 5.0 ml of liquid to flow from the burette into the funnel; 7) Open the electromagnetic drain valve of the funnel and let out 5.0 ml of liquid. After the liquid flows into the circular cavity of the penetration disk, it is connected to the electrode and the electronic timer starts to count automatically. When the liquid completely penetrates into 5 layers of 88g thick dust-free paper and the liquid level drops below the electrode, the timer stops counting; 8) Record the time displayed on the electronic timer; 9) Repeat the above steps 10 times until the two groups of 10 samples are tested (see Table 2 for test results); 10) Calculate the mean value as the liquid penetration time and obtain the following test results: IV. Conclusion From the above experiments and data analysis, it can be concluded that the one-way moisture-conducting non-woven fabric containing highly active probiotics prepared in Example 1 of the present invention has significant one-way moisture-conducting properties, and the liquid penetration time is less than 0.3s, which is much shorter than the liquid penetration time of the existing common process non-woven fabrics, and has rapid liquid conductivity.

Claims

1. A one-way moisture-conducting nonwoven fabric containing highly active probiotics, characterized in that It comprises a film-forming layer, a hydrophilic layer, a combing layer and a reverse osmosis layer in sequence. The raw material of the film-forming layer comprises an air-dried high-activity probiotic suspension coating, the raw material of the hydrophilic layer comprises only hydrophilic material, the combing layer is a hot air non-woven fabric material, and the raw material of the reverse osmosis layer comprises both hydrophilic material and hydrophobic material.

2. The one-way moisture-conducting nonwoven fabric containing highly active probiotics according to claim 1, characterized in that The high-activity probiotic suspension contains: 0.1%~1% of high-activity probiotics, 5%~15% of natural lactic acid-potassium lactate conjugate extract, 1%~5% of carboxymethyl chitosan and deionized water.

3. The one-way moisture-conducting nonwoven fabric containing highly active probiotics according to claim 1, characterized in that The hydrophilic material adopts a hydrophilic high molecular polymer, specifically polyvinyl alcohol PVA, polyethylene glycol PEG or polyvinyl pyrrolidone PVP; or a hydrophilic high molecular material, specifically cellulose, alginate or protein; the porosity of the hydrophilic material is 10%~30%.

4. The one-way moisture-conducting nonwoven fabric containing highly active probiotics according to claim 1, characterized in that The porosity of the carding layer is 30%-40%.

5. The one-way moisture-conducting nonwoven fabric containing highly active probiotics according to claim 1, characterized in that The mass ratio of the hydrophilic material to the hydrophobic material of the reverse osmosis layer is 3-5:5-7, and the porosity is 40%~60%.

6. A method for preparing a unidirectional moisture-conducting nonwoven fabric containing highly active probiotics, characterized in that Follow these steps to implement: S1: hot air nonwoven fabric is made by hot air process as the base layer; S2: preparing a spinning solution from a hydrophilic material, and spinning on the front side of a hot air nonwoven fabric using an electrospinning machine; S3: preparing a spinning solution from a mixture of a hydrophobic material and a hydrophilic material, and spinning on the back of a hot air nonwoven fabric using an electrospinning machine; S4: vacuum drying the nonwoven fabric obtained in step 3; S5: The highly active probiotic suspension is applied onto the hydrophilic layer by a high-precision coating method, and then air-dried to form a film-forming layer.

7. The method for preparing a unidirectional moisture-conducting nonwoven fabric containing highly active probiotics as claimed in claim 3, characterized in that The preparation method of the high-activity probiotic suspension is as follows: prepare the suspension by taking high-activity probiotics, natural lactic acid-potassium lactate conjugate extract, carboxymethyl chitosan and deionized water, and use a high-speed multifunctional mixer to fully and evenly mix the above raw materials until the liquid is clear, and the speed of the high-speed multifunctional mixer is 1000r / min.

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