Production process of medical non-woven fabric with unidirectional elasticity and medical non-woven fabric

Abstract

This application relates to the field of medical non-woven fabrics and their processing technologies, and specifically discloses a production process for a medical non-woven fabric with unidirectional elasticity and the medical non-woven fabric. The production process includes the following steps: S1, preparing a base fabric; S2, stretching the base fabric along the conveying direction; S3, spraying an elastic film material and shaping; S4, winding to form a medical non-woven fabric with unidirectional elasticity. The medical non-woven fabric is prepared by the above production process. This application has the effect of improving the anti-seepage performance of the medical non-woven fabric.

Description

Technical Field

[0001] This application relates to the field of medical non-woven fabrics and their processing technologies, and particularly to a production process and a medical non-woven fabric of a unidirectional elastic medical non-woven fabric. Background Art

[0002] Medical non-woven fabric products are medical and health textiles made of chemical fibers including polyester (PET), polyamide (PA), polytetrafluoroethylene (PTFE), polypropylene (PP), carbon fiber (CF), or glass fiber. Medical non-woven fabric products mainly include disposable masks, protective clothing, diapers, menstrual pants, sanitary napkins, baby diapers, medical elastic bandages, medical dressings, medical elastic stockings, etc.

[0003] Medical non-woven fabrics for close wearing, such as menstrual pants, baby diapers, medical dressings, and medical elastic stockings, etc., usually require unidirectional elasticity to fit the wound, hip curve, or leg curve, and improve protection and wearing comfort.

[0004] In related technologies, a preparation method of a medical non-woven fabric specifically includes the steps of conveying a formed fiber web into an oven. During the baking process, the fiber web is transversely stretched, and the stretching force gradually decreases along the longitudinal direction of the fiber web. At this time, the temperature in the oven gradually decreases along the conveying direction of the fiber web until the fiber web is conveyed out of the oven and naturally cooled to room temperature to obtain a unidirectional elastic non-woven fabric. During the use of this non-woven fabric, when it fits the wound, hip curve, and leg curve, and the human body moves, the non-woven fabric is stretched, reducing the binding force of the medical non-woven fabric on the body and improving the comfort of human wearing.

[0005] However, when the medical non-woven fabric is stretched, the pores between adjacent fibers become larger, and the anti-seepage performance of the medical non-woven fabric decreases. For menstrual pants, baby diapers, or dressings carrying highly permeable oily drugs, leakage is likely to occur. Summary of the Invention

[0006] In order to improve the anti-seepage performance of medical non-woven fabrics, this application provides a production process and a medical non-woven fabric of a unidirectional elastic medical non-woven fabric.

[0007] In a first aspect, a production process of a unidirectional elastic medical non-woven fabric provided by this application adopts the following technical solution:

[0008] The production process of the unidirectional elastic medical non-woven fabric includes the following steps:

[0009] S1. Prepare a base fabric;

[0010] S2. Stretch the base fabric along the conveying direction;

[0011] S3. Spray an elastic film material and shape it;

[0012] S4. Winding to form a unidirectionally elastic medical non-woven fabric;

[0013] The raw materials of the base fabric include polypropylene and a toughening agent;

[0014] The raw materials of the elastic film material include thermoplastic elastomer (TPE), a reinforcing body, and modified aerogel micropowder. The weight ratio of the thermoplastic elastomer, the reinforcing body, and the modified aerogel micropowder is (35 - 105):3:(17 - 27).

[0015] By adopting the above technical solution, after the base fabric is pre-stretched radially and the elastic film material is sprayed, the radial stretching allowance of the medical non-woven fabric is less than the transverse stretching allowance, that is, the radial elongation rate of the medical non-woven fabric is less than the transverse elongation rate. When the base fabric is pre-stretched, the elongation rate reaches 40% - 60% to form a medical non-woven fabric with unidirectional elasticity. The elastic film material adheres to the base fabric, improving the tensile strength of the base fabric and endowing the base fabric with elasticity; the base fabric, thermoplastic elastomer (TPE), the reinforcing body, and the modified aerogel micropowder are used in combination. The anti-deformation ability and elasticity of the thermoplastic elastomer (TPE) enable the base fabric to have resilience after being combined with the thermoplastic elastomer (TPE); the modified aerogel micropowder is combined with the base fabric to fill the internal pores caused by pre-drawing of the base fabric, improving the self-sealing property of the medical non-woven fabric, thereby improving the anti-seepage property of the medical non-woven fabric; the specific surface area of the modified aerogel micropowder improves the air permeability and antibacterial property of the medical non-woven fabric; the modified aerogel micropowder has a low density and is easy to float in the mixture. When it is used in combination with the thermoplastic elastomer (TPE), the thermoplastic elastomer (TPE) adheres to the modified aerogel micropowder and carries the modified aerogel micropowder to penetrate into the base fabric, increasing the adhesion amount of the modified aerogel micropowder to the base fabric, thereby improving the anti-seepage property of the medical non-woven fabric.

[0016] Compared with heat shrinking, spraying the elastic film material on the surface of the base fabric forms an anti-seepage layer on the surface of the base fabric, improving the anti-seepage performance of the medical non-woven fabric, and this anti-seepage layer has elasticity. When the human body moves, the medical non-woven fabric still has good anti-seepage performance when it is stretched.

[0017] Optionally, the precursor of the modified aerogel micropowder is graphene oxide solution.

[0018] By adopting the above technical solution, the modified aerogel prepared from the graphene oxide solution inhibits the reproduction of bacteria and microorganisms on the medical non-woven fabric, reducing the generation of moisture and odor of the medical non-woven fabric; the modified aerogel prepared from the graphene oxide solution improves the air permeability and water absorption of the medical non-woven fabric, and improves the anti-seepage property of the medical non-woven fabric; the modified aerogel prepared from the graphene oxide solution is used in combination with TEP, improving the wear resistance and solvent resistance of the elastic film material, thereby improving the anti-seepage property of the medical non-woven fabric to body fluids and drugs.

[0019] Optionally, the raw materials for preparing the modified aerogel micropowder include graphene aerogel, sodium metasilicate pentahydrate, and ammonium chloride, and the weight ratio of the graphene oxide aerogel, sodium metasilicate pentahydrate, and ammonium chloride is (15-26):(1-6):1.

[0020] By adopting the above technical solution, graphene oxide aerogel, sodium metasilicate pentahydrate, and ammonium chloride are used in combination. Sodium metasilicate pentahydrate is adsorbed on the graphene oxide aerogel and penetrates into the micropores of the graphene oxide aerogel. On the one hand, it increases the density of the modified aerogel, facilitating the sinking of the modified aerogel into the interior of the thermoplastic elastomer (TPE) and the base fabric; on the other hand, the silicon component of sodium metasilicate pentahydrate improves the dispersibility of the graphene oxide aerogel and the uniformity of its dispersion on the base fabric; the ionic polarity of ammonium chloride interacts with functional groups such as hydroxyl groups on the surface of the graphene oxide aerogel to form an electrostatic attraction, facilitating the dispersion of the graphene oxide aerogel. When the elastic membrane material melts, ammonium chloride is used in combination with the thermoplastic elastomer (TPE). Ammonium chloride accelerates the hydroxylation reaction of functional groups such as carboxylic acids and esters in the thermoplastic elastomer (TPE), thereby increasing the viscosity of the thermoplastic elastomer (TPE), facilitating the spraying and adhesion of the elastic membrane material on the base fabric, reducing the probability of the elastic membrane material falling off, and thus improving the stability of the anti-permeability performance of the medical non-woven fabric.

[0021] Optionally, the preparation of the modified aerogel micropowder includes the following steps: preparing graphene aerogel; dispersing sodium metasilicate pentahydrate and ammonium chloride in ethanol, putting in the graphene aerogel, and soaking until the graphene aerogel is saturated; placing it in an oven at 45-55°C for atmospheric drying for 20-24 hours, and grinding to obtain the modified aerogel micropowder.

[0022] By adopting the above technical solution, it is convenient for sodium metasilicate pentahydrate and ammonium chloride to be adsorbed on the graphene aerogel, improving the stability of the performance of the modified aerogel.

[0023] Optionally, the reinforcing body is a polyolefin elastomer.

[0024] By adopting the above technical solution, the polyolefin elastomer POE has good affinity with the thermoplastic elastomer (TPE). The polyolefin elastomer POE effectively enhances the tensile property and low-temperature toughness of the thermoplastic elastomer (TPE). When the medical non-woven fabric is stretched, the elastic membrane material is not easily cracked, improving the anti-permeability of the medical non-woven fabric in the stretched state.

[0025] Optionally, the weight ratio of the polypropylene to the toughening agent is 14:(5-7).

[0026] By adopting the above technical scheme, the tensile properties of polypropylene are improved. During pre-stretching, the base fabric is not easily broken, which facilitates the stretching of the base fabric, reduces the overall thickness of the medical non-woven fabric, facilitates the development and production of medical non-woven fabrics with a thickness of less than 2 mm, and improves the wearing comfort of the medical non-woven fabric.

[0027] Optionally, the toughening agent includes polymer polyol and polyolefin elastomer, and the weight ratio of the polymer polyol to the polyolefin elastomer is (2-4):3.

[0028] By adopting the above technical solution, the polymer polyol and the polyolefin elastomer are used in combination to improve the toughening performance of the base fabric.

[0029] Optionally, the base fabric in S1 is prepared by a spunbond method.

[0030] By adopting the above technical scheme, the spunbond method improves the production efficiency of medical non-woven fabrics, and improves the softness, comfort and breathability of medical non-woven fabrics. The base fabric fibers prepared by the spunbond method are directly bonded, and the structure is tight, which is convenient for the elastic film material to be sprayed and attached to form an impermeable film away from the skin.

[0031] Optionally, S3 specifically includes the following steps: spraying the elastic film material on one side of the base fabric, and cold rolling for shaping.

[0032] By adopting the above technical solution, the elastic film material is sprayed on the base fabric and cold-rolled to shape it. The film structure formed by the elastic film material is not easy to form bubbles, thereby improving the stability and uniformity of the medical non-woven fabric.

[0033] In the second aspect, the present application provides a method for preparing a medical nonwoven fabric using the following technical solution:

[0034] The medical nonwoven fabric is prepared by the production process of the medical nonwoven fabric with unidirectional elasticity.

[0035] By adopting the above technical solution, the medical non-woven fabric has unidirectional elasticity. When used on menstrual pants, the medical non-woven fabric can be stretched and deformed laterally along the human buttocks, but is not easily deformed radially, making it difficult for protective equipment to slip radially, thereby improving the safety of using the menstrual pants.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. The base fabric is pre-stretched radially. The radial stretching margin of the medical non-woven fabric is less than the transverse stretching margin, and the radial elongation rate of the medical non-woven fabric is less than the transverse elongation rate. The elastic film material is sprayed on the base fabric to endow the base fabric with resilience, forming a medical non-woven fabric with unidirectional elasticity. Compared with heat shrinking, spraying the elastic film material on the surface of the base fabric forms an anti-seepage layer on the surface of the base fabric, improving the anti-seepage performance of the medical non-woven fabric. Moreover, this anti-seepage layer has elasticity, and when the human body moves and the medical non-woven fabric is stretched, it still has good anti-seepage performance.

[0038] 2. When the base fabric is pre-drawn, the spacing between fibers increases, resulting in an increase in the internal pores of the base fabric. The modified gas gel micropowder adheres to the surface of the base fabric carried by the thermoplastic elastomer (TPE). The modified aerogel micropowder penetrates into the pores and fills the pores, improving the self-sealing property of the medical non-woven fabric, thereby improving the anti-seepage performance of the medical non-woven fabric. The large specific surface area of the modified gas gel micropowder improves the air permeability and antibacterial property of the medical non-woven fabric.

[0039] 3. The modified gas gel micropowder has a low density and is easy to float in the mixture. It is used in combination with the thermoplastic elastomer (TPE). The thermoplastic elastomer (TPE) adheres to the modified gas gel micropowder and carries the modified gas gel micropowder to penetrate into the base fabric, increasing the adhesion amount of the modified gas gel micropowder to the base fabric, thereby improving the anti-seepage performance of the medical non-woven fabric.

[0040] 4. The ionic polarity of ammonium chloride interacts with functional groups such as hydroxyl groups on the surface of graphene oxide aerogel to form an electrostatic attraction, facilitating the dispersion of graphene oxide aerogel. When the elastic film material melts, ammonium chloride is used in combination with the thermoplastic elastomer (TPE). Ammonium chloride accelerates the hydroxylation reaction of functional groups such as carboxylic acid and ester in the thermoplastic elastomer (TPE), thereby improving the viscosity of the thermoplastic elastomer (TPE). At this time, the graphene oxide aerogel adsorbed with ammonium chloride is near the sticky TPE, facilitating the adhesion of the graphene oxide aerogel to the base fabric and improving the stability of the anti-seepage performance of the medical non-woven fabric. Detailed implementation manners

[0041] The present application will be further described in detail below with reference to examples and comparative examples.

[0042] In the following examples, those not specified in detail are carried out according to conventional conditions or conditions recommended by the manufacturer. Except as otherwise specified, the raw materials used in the following examples can all be obtained from ordinary commercial sources.

[0043] The polypropylene is selected from polypropylene PP plastic particles with a particle size of 3 - 5 cm, abbreviated as PP.

[0044] The thermoplastic elastomer is selected from TPE particles, abbreviated as TPE, with a particle size of 2 cm ± 0.5 cm and a melting point of 95 °C.

[0045] The polyolefin elastomer is selected from a spinning-grade thermoplastic elastomer obtained by in-situ polymerization of ethylene and octene using a metallocene catalyst, abbreviated as POE, with a particle size of 3-5 cm;

[0046] The polymer polyol is selected from POP particles, abbreviated as POP, with a particle size of 3-5 cm;

[0047] The graphene oxide has a carbon content of 46%, a hydrogen content of <1%, a nitrogen content of <1%, a sulfur content of <1.5%, and an oxygen content of 46%;

[0048] Sodium metasilicate pentahydrate has a density of 2.61 g / cm 3 , a particle size of 400 mesh, and a melting point of 1088 °C;

[0049] The ammonium chloride content is ≥96%, the particle size is 400 mesh, and the melting point is 340 °C.

[0050] Preparation Examples

[0051] Preparation Example 1

[0052] S1. Take 2.6 kg of graphene oxide powder and place it in 40 L of deionized water, and ultrasonically treat it for 30 min to obtain a graphene oxide dispersion;

[0053] S2. Mix the graphene dispersion prepared in S1 with 5.2 kg of vitamin C and magnetically stir for 30 min, then place it in an 80 °C oven and react for 60 min, and take it out and let it cool naturally to room temperature;

[0054] S3. Place it in an environment of -18 °C and freeze for 1.5 h, then thaw at room temperature, and repeat the freeze-thaw process 3 times;

[0055] S4. Place it in an 80 °C oven and let it stand for 6 h, wash it with deionized water, and then replace the deionized water with anhydrous ethanol in a gradient manner;

[0056] S5. Place it in a 50 °C oven and dry it under normal pressure for 24 h to obtain a graphene aerogel;

[0057] S6. Take 0.6 kg of sodium metasilicate pentahydrate and 0.1 kg of ammonium chloride and disperse them in 50 L of anhydrous ethanol, put the graphene aerogel prepared in S5, and soak for 24 h until the graphene aerogel is saturated;

[0058] S7. Place it in a 50 °C oven and dry it under normal pressure for 24 h, and grind it to obtain a modified aerogel micropowder with a particle size of 200 mesh;

[0059] S8. Take 7 kg of thermoplastic elastomer (TPE), 0.6 kg of POE, and 2.6 kg of the modified aerogel micropowder prepared in S7, mix them evenly, and heat to 100 °C to obtain an elastic mold material.

[0060] Preparation Example 2

[0061] S1. Take 2 kg of graphene oxide powder and place it in 40 L of deionized water. Ultrasonically treat it for 30 min to obtain a graphene oxide dispersion.

[0062] S2. Mix the graphene dispersion prepared in S1 with 4 kg of vitamin C and magnetically stir for 30 min. Then place it in an 80°C oven and react for 60 min. Take it out and let it cool naturally to room temperature.

[0063] S3. Place it in an environment at -18°C and freeze for 1.5 h. Then thaw it at room temperature and repeat the freeze-thaw cycle 3 times.

[0064] S4. Place it in an 80°C oven and let it stand for 6 h. Wash it with deionized water, and then gradually replace the deionized water with absolute ethanol.

[0065] S5. Place it in a 50°C oven and dry it at normal pressure for 24 h to obtain a graphene aerogel.

[0066] S6. Take 0.4 kg of sodium metasilicate pentahydrate and 0.1 kg of ammonium chloride and disperse them in 50 L of absolute ethanol. Put the graphene aerogel prepared in S5 into it and soak for 24 h until the graphene aerogel is saturated.

[0067] S7. Place it in a 50°C oven and dry it at normal pressure for 24 h. Grind it to obtain modified aerogel micropowder with a particle size of 200 mesh.

[0068] S8. Take 7 kg of thermoplastic elastomer (TPE), 0.5 kg of POE, and 2.5 kg of the modified aerogel micropowder prepared in S7. Mix them evenly and heat to 100°C to obtain an elastic modulus material.

[0069] Preparation Example 3

[0070] S1. Take 1.5 kg of graphene oxide powder and place it in 40 L of deionized water. Ultrasonically treat it for 30 min to obtain a graphene oxide dispersion.

[0071] S2. Mix the graphene dispersion prepared in S1 with 3 kg of vitamin C and magnetically stir for 30 min. Then place it in an 80°C oven and react for 60 min. Take it out and let it cool naturally to room temperature.

[0072] S3. Place it in an environment at -18°C and freeze for 1.5 h. Then thaw it at room temperature and repeat the freeze-thaw cycle 3 times.

[0073] S4. Place it in an 80°C oven and let it stand for 6 h. Wash it with deionized water, and then gradually replace the deionized water with absolute ethanol.

[0074] S5. Place it in a 50°C oven and dry it at normal pressure for 24 h to obtain a graphene aerogel.

[0075] S6. Disperse 0.1 kg of sodium metasilicate pentahydrate and 0.1 kg of ammonium chloride in 50 L of absolute ethanol, add the graphene aerogel prepared in S5, and soak for 24 h until the graphene aerogel is saturated;

[0076] S7. Place it in an oven at 50 °C and dry it under normal pressure for 24 h, then grind it to obtain modified aerogel micropowder with a particle size of 200 mesh;

[0077] S8. Take 7 kg of thermoplastic elastomer (TPE), 0.2 kg of POE, and 1.8 kg of the modified aerogel micropowder prepared in S7, mix them evenly and heat to 100 °C to obtain an elastic modulus material.

[0078] Preparation Example 4 - Preparation Example 11

[0079] The difference from Example 2 is that the addition amounts of each component are different, as shown in Table 1 for details.

[0080] Preparation Example 12

[0081] The difference from Example 2 is that in S8, take 7 kg of thermoplastic elastomer (TPE) and 2.5 kg of the modified aerogel micropowder prepared in S7, mix them evenly and heat to 85 °C to obtain an elastic modulus material.

[0082] Preparation Example 13

[0083] Take 7 kg of thermoplastic elastomer (TPE) and 0.5 kg of POE, mix them evenly and heat to 85 °C to obtain an elastic modulus material.

[0084] Preparation Example 14

[0085] The difference from Example 2 is that in S6, disperse 0.1 kg of ammonium chloride in 50 L of absolute ethanol, add the graphene aerogel prepared in S5, and soak for 24 h until the graphene aerogel is saturated.

[0086] Preparation Example 15

[0087] The difference from Example 2 is that in S6, disperse 0.4 kg of sodium metasilicate pentahydrate in 50 L of absolute ethanol, add the graphene aerogel prepared in S5, and soak for 24 h until the graphene aerogel is saturated.

[0088] Table 1 Raw material table of preparation examples (kg)

[0089]

[0090]

[0091] Example

[0092] Example 1

[0093] S1. Prepare the base fabric using the spunbond process;

[0094] S11. Take 10 kg of POP and 15 kg of POE, mix them evenly as the toughening agent;

[0095] S12. Inhale 70 kg of PP and the toughening agent obtained in S11 into the batching machine, and convey them to the screw extruder. Set the melting temperature at 220 °C; the filtration and impurity removal temperature is 220 °C, and the filtration accuracy is 300 mesh; the spinning temperature is 220 °C, and the number of spinneret holes on the spinneret plate is 8000; the cold air chamber pressure is 2600 Pa, the cold air temperature is 20 °C, and the process cold air flow rate in the upper part of the side blowing is 5800 m 3 / h, and the process cold air flow rate in the lower part of the side blowing is 11800 m 3 / h; Cross-lay the web on the forming screen conveyor to form a fiber web;

[0096] S13. Thermally bond and reinforce the fiber web at a thermal bonding temperature of 130 °C, a linear speed of 13 m / min, and a pressure of 60 kgf / cm to obtain the base fabric;

[0097] S2. One end of the base fabric in the radial direction is clamped by the conveying roller, and the other end is clamped by the cloth winding roller. The base fabric is heated in the oven, and the oven temperature is 75 °C. Adjust the speed ratio of the conveying roller and the cloth winding roller, and the draw ratio is 1.5 times;

[0098] S3. Take 11 kg of the elastic film material prepared in Preparation Example 1 and evenly spray it on the upper surface of the base fabric through the coating die head, and cold roll and shape it;

[0099] S4. After winding and forming, place it in a standard environment (25 °C, 60%) and let it stand for 24 h to form a unidirectionally elastic medical non-woven fabric.

[0100] Examples 2 - 3

[0101] The difference from Example 1 is that the addition amounts of each material are different, as shown in Table 2 for details.

[0102] Examples 4 - 5

[0103] The difference from Example 2 is that 9 kg and 10 kg of the elastic film material prepared in Preparation Example 2 are respectively sprayed, as shown in Table 2 for details.

[0104] Examples 6 - 13

[0105] The difference from Example 2 is that the elastic film materials prepared in Preparation Examples 4 - 11 are sequentially sprayed.

[0106] Comparative Examples

[0107] Comparative Example 1

[0108] S1. Take 10 kg of POP and 15 kg of POE, mix them evenly as the toughening agent;

[0109] S2. Inhale 70 kg of polypropylene (PP) and the toughening agent obtained in S1 into the batching machine, and convey them to the screw extruder. Set the melting temperature at 220 °C; the filtration and impurity removal temperature is 220 °C, and the filtration accuracy is 300 meshes; the spinning temperature is 220 °C, and the number of spinneret holes on the spinneret plate is 8,000; the cold air chamber pressure is 2,600 Pa, the cold air temperature is 20 °C, and the process cold air flow rate in the upper part of the side blowing is 5,800 m 3 / h, and the process cold air flow rate in the lower part of the side blowing is 11,800 m 3 / h; Cross-lay the web on the forming screen conveyor belt to form a fiber web;

[0110] S3. Thermally bond and reinforce the fiber web, with a thermal bonding temperature of 130 °C, a linear speed of 13 m / min, and a pressure of 60 kgf / cm to obtain the base fabric; S4. One radial end of the base fabric is clamped by the conveying roller, and the other end is clamped by the fabric winding roller. The base fabric passes through the oven for heating, the oven temperature is 75 °C, adjust the speed ratio of the conveying roller and the fabric winding roller, and the draw ratio is 1.5 times to form a unidirectional elastic medical non-woven fabric.

[0111] Comparative Example 2 - Comparative Example 5

[0112] The difference from Example 2 is that 10 kg of the elastic film materials prepared in Preparation Examples 12 - 15 are sprayed in sequence.

[0113] Comparative Example 6

[0114] The difference from Example 2 is that no toughening agent is added.

[0115] Comparative Example 7

[0116] The difference from Example 2 is that 30 kg of POE is used as the toughening agent and no POP is added.

[0117] Comparative Example 8

[0118] The difference from Example 2 is that 30 kg of POP is used as the toughening agent and no POE is added.

[0119] Comparative Example 9

[0120] The difference from Example 2 is that: the draw ratio in S4 is 1.4.

[0121] Comparative Example 10

[0122] The difference from Example 2 is that: the draw ratio of the base fabric in S4 is 1.6.

[0123] Comparative Example 11

[0124] The difference from Example 2 is that in S4, one radial end of the base fabric is clamped by the conveying roller, and the other end is clamped by the cloth winding roller. The speed ratio of the conveying roller and the cloth winding roller is adjusted, and the draft ratio is 1.5 times.

[0125] Table 2 Raw material table of examples and comparative examples (kg)

[0126]

[0127]

[0128] Performance detection test

[0129] Test method

[0130] 1. Use a digital display YG141 fabric thickness gauge to measure the thickness (mm) of the medical non-woven fabric. The test results are shown in Table 3 for details.

[0131] 2. Adopt the method in "GB / T24218.16-2017 Textiles - Test methods for non-woven fabrics - Part 16: Determination of water resistance (hydrostatic pressure method)" to measure the hydrostatic pressure (kPa) of the medical non-woven fabric. Among them, the test water pressure is applied from the upper side of the specimen, and the water pressure rising speed is (10 ± 0.5) hPa / min; the test in the relaxed state is carried out according to the standard steps, and the test in the stretched state is to fix the medical non-woven fabric after it is stretched 1.5 times horizontally for testing. The test results are shown in Table 3 for details.

[0132] 3. Adopt the method in "GB / T24218.18-2014 Textiles - Test methods for non-woven fabrics - Part 18: Determination of bursting strength and elongation at break (grab method)" to measure the elongation at break (%) of the medical non-woven fabric. The test results are shown in Table 3 for details.

[0133] Table 3 Data table of test results of each example and comparative example

[0134]

[0135] Combined with Table 3, it can be seen that in each example, when the draft ratio remains unchanged, the thickness change rate is less than 10%. Compared with the conventional medical non-woven fabric with a thickness of 1 mm, the medical non-woven fabric prepared in this application is thinner and lighter.

[0136] Combined with Example 1, Example 2 and Example 3 and combined with Table 3, by adjusting the addition amounts of PP, POP and POE in the base fabric, and the contents of TPE, POE and modified aerogel micropowder in the elastic film material, the water resistance of the medical non-woven fabric is improved.

[0137] Combined with Example 2 and Comparative Example 1 and combined with Table 3, it can be seen that after spraying the elastic film material, the hydrostatic pressure of the medical non-woven fabric is significantly improved, and the elongation at break in the horizontal direction of the medical non-woven fabric is significantly improved.

[0138] Combining Example 2, Example 4 and Example 5 and referring to Table 3, it can be seen that as the spraying amount of the spray elastic film material increases, the thickness of the medical non-woven fabric increases, the hydrostatic pressure increases, and the elongation at break first increases and then decreases. Through on-site hand feel testing, as the thickness of the spray elastic film material increases, the hardness of the medical non-woven fabric increases. The preparation raw materials of the spray elastic film material include TPE, POE and modified aerogel micropowder. POE and modified aerogel micropowder modify TPE, improving the tensile strength and wear resistance of TPE. The modified aerogel micropowder is used in combination with the base fabric, improving the self-sealing property and anti-seepage property of the medical non-woven fabric.

[0139] Combining Example 2 and Comparative Example 2 and referring to Table 3, it can be seen that the addition of POE increases the elongation at break in the transverse direction of the medical non-woven fabric.

[0140] Combining Example 2, Example 6 and Example 7 and referring to Table 3, it can be seen that as the addition amount of POE in the spray elastic film material increases, the elongation at break of the medical non-woven fabric first increases and then decreases.

[0141] Combining Example 2 and Comparative Example 3 and referring to Table 3, it can be seen that the addition of modified aerogel micropowder increases the hydrostatic pressure of the medical non-woven fabric.

[0142] Combining Example 2, Example 8 and Example 9 and referring to Table 3, it can be seen that as the addition amount of modified aerogel micropowder in the spray elastic film material increases, the hydrostatic pressure in the tensile state of the medical non-woven fabric first increases and then decreases, and the elongation at break first increases and then decreases. The preparation raw materials of the modified aerogel micropowder include graphene oxide aerogel, sodium metasilicate pentahydrate and ammonium chloride. As the content of the modified aerogel micropowder increases, part of the modified aerogel floats on the surface of the base fabric or escapes into the air during spraying, weakening the improvement effect on the base fabric; the modified aerogel micropowder increases the porosity of the membrane structure formed by the elastic film material, and the anti-seepage property of the medical non-woven fabric decreases.

[0143] Combining Example 2, Example 10 and Example 11 and referring to Table 3, it can be seen that as the addition amount of graphene oxide in the modified aerogel micropowder increases, the hydrostatic pressure in the tensile state of the medical non-woven fabric first increases and then decreases.

[0144] Combining Example 2 and Comparative Example 4 and referring to Table 3, it can be seen that the addition of sodium metasilicate pentahydrate in the modified aerogel micropowder increases the hydrostatic pressure and elongation at break of the medical non-woven fabric.

[0145] Combining Example 2, Example 12 and Example 13 and referring to Table 3, it can be seen that as the addition amount of sodium metasilicate pentahydrate in the modified aerogel micropowder increases, the elongation at break of the medical non-woven fabric first increases and then decreases.

[0146] Combined with Example 2 and Comparative Example 5 and Table 3, it can be seen that the addition of ammonium chloride in the modified aerogel micropowder improves the hydrostatic pressure and transverse elongation at break of the medical non-woven fabric.

[0147] Combined with Example 2 and Comparative Example 6 and Table 3, it can be seen that the addition of toughening agent in the base fabric improves the hydrostatic pressure and elongation at break of the medical non-woven fabric.

[0148] Combined with Example 2, Comparative Example 6, Comparative Example 7 and Comparative Example 8 and Table 3, it can be seen that the combined use of POP and POE in the toughening agent improves the hydrostatic pressure and elongation at break of the medical non-woven fabric.

[0149] Combined with Example 2, Comparative Example 9 and Comparative Example 10 and Table 3, it can be seen that with the increase of the draw ratio of the base fabric, the thickness of the medical non-woven fabric decreases, the hydrostatic pressure decreases, and the elongation at break decreases.

[0150] Combined with Example 2 and Comparative Example 11 and Table 3, it can be seen that heating the base fabric during the drawing process improves both the hydrostatic pressure and elongation at break of the prepared medical non-woven fabric.

[0151] This specific embodiment is only an interpretation of the present application, and it does not limit the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. The production process of a unidirectional elastic medical non-woven fabric is characterized in that, It includes the following steps: S1. Prepare the base fabric; S2. Stretch the base fabric along the conveying direction; S3. Spray the elastic film material and set the shape; S4. Wind it up to form a unidirectionally elastic medical non-woven fabric; The raw materials of the base fabric include polypropylene and a toughening agent, and the toughening agent includes polymer polyol and polyolefin elastomer; The preparation raw materials of the elastic film material include thermoplastic elastomer, a reinforcing body and modified aerogel micropowder, and the weight ratio of the thermoplastic elastomer, the reinforcing body and the modified aerogel micropowder is (35-105):3:(17-27); the reinforcing body is polyolefin elastomer; the preparation raw materials of the modified aerogel micropowder include graphene aerogel, sodium metasilicate pentahydrate and ammonium chloride, the precursor of the graphene aerogel is graphene oxide, and the weight ratio of the graphene oxide, the sodium metasilicate pentahydrate and the ammonium chloride is (15-26):(1-6):

1.

2. The production process of the unidirectional elastic medical non-woven fabric according to claim 1, characterized in that, The preparation of the modified aerogel micropowder includes the following steps: prepare graphene aerogel; disperse sodium metasilicate pentahydrate and ammonium chloride in ethanol, put in the graphene aerogel, and soak until the graphene aerogel is saturated; place it in an oven at 45-55°C for atmospheric drying for 20-24 h, and grind it to obtain the modified aerogel micropowder.

3. The production process of the unidirectional elastic medical non-woven fabric according to claim 1, characterized in that, The weight ratio of the polypropylene to the toughening agent is 14:(5-7).

4. The production process of the unidirectional elastic medical non-woven fabric according to claim 3, characterized in that, The weight ratio of the polymer polyol and the polyolefin elastomer is (2-4):

3.

5. The production process of the unidirectional elastic medical non-woven fabric according to claim 1, characterized in that, The base fabric in S1 is prepared by the spunbond method.

6. The production process of the unidirectional elastic medical non-woven fabric according to claim 1, characterized in that, S3 specifically includes the following steps: spray the elastic film material on one side of the base fabric and cold roll to set the shape.

7. Medical non-woven fabric, characterized in that, It is prepared by the production process of the unidirectionally elastic medical non-woven fabric according to any one of claims 1-6.

Images