Moisture-absorbing antibacterial knitted fabric, preparation method thereof and application of moisture-absorbing antibacterial knitted fabric in underwear
By combining modified polyurethane fibers and finishing agents, knitted fabrics with hygroscopic, antibacterial, antistatic and flame retardant properties are prepared, which solves the shortcomings of existing underwear fabrics in these properties and improves the comfort and health of the fabric.
Patent Information
- Application Number
- CN202510134450.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2025-03-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing underwear fabrics have shortcomings in moisture absorption, antibacterial, antistatic and flame retardant properties, and it is difficult to meet the high requirements of users for comfort and health.
The yarn is prepared by dry spinning process using modified polyurethane fibers. After warp knitted into grey fabric, it is finished with a special finishing agent to form a hygroscopic and antibacterial knitted fabric with hygroscopic, antibacterial, antistatic and flame retardant properties.
It achieves efficient moisture absorption, good antibacterial properties, good antistatic properties and improved flame retardant properties of the fabric, improving the comfort and health of the fabric.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of fabrics, in particular to a moisture-absorbing and antibacterial knitted fabric and an application of a preparation method thereof in underwear. Background Art
[0002] Knitted fabrics are made by bending yarns into loops and interlacing them with knitting needles. They are divided into weft knitted fabrics and warp knitted fabrics. Due to their unique coil structure, knitted fabrics can fit the human body curve well when worn, providing a comfortable wearing experience. Therefore, knitted fabrics are often used to make underwear to meet people's needs for comfort and functionality of underwear.
[0003] The fabric selection of underwear is very important, as it is directly related to the comfort and health of wearing. Common underwear fabrics include cotton, silk, chemical fiber and new fiber fabrics such as bamboo fiber. Among them, polyurethane fabrics are popular because of their good elasticity. Polyurethane fabrics have good resilience and wear resistance, can fit the human body curve well, and provide support and shaping effects.
[0004] Underwear is a piece of clothing worn close to the skin and is in close contact with the skin. It easily absorbs sweat secreted by the human body. These substances provide an environment for the growth of bacteria. Therefore, using antibacterial fabrics to make underwear can effectively inhibit the growth and reproduction of bacteria and keep the underwear clean and healthy. In addition, in dry climates, the friction between the human body and clothing can easily generate static electricity, causing discomfort and even irritation to the skin. The design of antistatic underwear can effectively reduce the generation and accumulation of static electricity and provide a more comfortable wearing experience. In addition to antibacterial and antistatic properties, since the fabric is flammable and is extremely easy to burn in dry weather and when exposed to open flames, it is possible to consider giving the fabric certain flame retardant properties to improve the safety of the fabric during use and storage.
[0005] In summary, knitted fabrics are often used to make underwear due to their unique properties and comfort. The selection of underwear fabrics needs to comprehensively consider multiple factors such as elasticity, antibacterial properties, antistatic properties and flame retardant properties to ensure comfort and health when wearing. Summary of the invention
[0006] The object of the present invention is to provide a moisture-absorbing and antibacterial knitted fabric and a preparation method thereof, so as to solve the problems existing in the prior art.
[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a hygroscopic and antibacterial knitted fabric, wherein the hygroscopic and antibacterial knitted fabric is obtained by finishing grey cloth woven from modified polyurethane fibers with a finishing agent.
[0008] As an optimization, the modified polyurethane fiber is prepared by polymerizing sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, and dicyclohexylmethane-4,4'-diisocyanate, and then reacting with 3-pyrrole boric acid to obtain modified polyurethane, which is then prepared by a dry spinning process.
[0009] As an optimization, the finishing agent is prepared from pyrrole, p-methylbenzaldehyde, modified silicone oil and sulfuric acid; the modified silicone oil is prepared by reacting vinyl silicone oil, mercapto polyether and butanethiol to obtain polyether-modified silicone oil, which is then reacted with 4-bromomethylbenzaldehyde.
[0010] A method for preparing a moisture-absorbing and antibacterial knitted fabric comprises the following preparation steps: (1) Sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, dicyclohexylmethane-4,4'-diisocyanate, and 3-pyrrole boric acid were weighed in a molar ratio of 1:4:10:12; polytetrahydrofuran and N,N-dimethylformamide were mixed in a mass ratio of 1:30, sodium 2,4-diaminobenzenesulfonate was added, the temperature was raised to 60°C, dicyclohexylmethane-4,4'-diisocyanate and dibutyltin dilaurate (0.02 times the mass of polytetrahydrofuran) were added, prepolymerized for 4 hours under a nitrogen atmosphere, 3-pyrrole boric acid was added, and the reaction was continued at room temperature for 8 hours. After washing with pure water for 4 times, a modified polyurethane was obtained; (2) Using N,N-dimethylformamide to prepare a spinning solution with a mass fraction of 15% of the modified polyurethane; using a dry spinning process to prepare the spinning solution into modified polyurethane fibers, and then twisting and spinning the modified polyurethane fibers into yarns, and knitting the yarns into grey fabrics using a warp knitting machine; (3) Vinyl silicone oil, mercapto polyether, butanethiol, photoinitiator and tetrahydrofuran are mixed in a mass ratio of 1: (0.5-0.7): (0.2-0.3): (0.02-0.03): (40-50), and irradiated under ultraviolet light for 20 minutes to obtain polyether modified silicone oil; (4) Under argon protection, polyether modified silicone oil, 4-bromomethylbenzaldehyde, N,N-dimethylformamide, and silver tetrafluoroborate are mixed in a mass ratio of 1: (0.2-0.3): (20-30): (0.2-0.3), reacted at room temperature for 12 hours, filtered and retained the filtrate, added with ion exchange resin 2-3 times the mass of the polyether modified silicone oil, and stirred for 2 hours. After the stirring, filtered and vacuum evaporated to obtain modified silicone oil; (5) Pyrrole, p-methylbenzaldehyde, modified silicone oil, dioxane and sulfuric acid are mixed in a mass ratio of (2-3): (1-2): 40:1000:10 to obtain a finishing agent solution, and the grey cloth is added to the finishing agent solution. After being immersed for 24 hours, the grey cloth is subjected to a dipping and rolling process, pre-baked at 80°C for 2 minutes, and then baked at 120-130°C for 1 minute. The fabric is washed four times with 2 mol / L ammonia water, and then washed and dried to obtain a hygroscopic and antibacterial knitted fabric.
[0011] As an optimization, the molecular weight of the polytetrahydrofuran in step (1) is 2000.
[0012] As an optimization, the dry spinning process parameters of step (2) are as follows: temperature of 230°C, spinning speed of 500 m / min; linear density of the modified polyurethane fiber of 40 dtex; surface density of the grey cloth of 80 g / m 2 .
[0013] As an optimization, the vinyl silicone oil in step (3) is of model DY-V411, purchased from Shandong Dayi Chemical Co., Ltd.; the thiol polyether is methoxy polyethylene glycol thiol, with a molecular weight of 2000, purchased from Shanghai Pengshuo Biotechnology Co., Ltd.; the photoinitiator is benzil dimethyl ether; the power of the ultraviolet lamp is 100 W, and the wavelength is 365 nm.
[0014] As an optimization, the ion exchange resin in step (4) is a strongly basic anion exchange resin type I purchased from Maclean.
[0015] As an optimization, the one-immersion-one-rolling process in step (5) has a rolling rate of 80%.
[0016] The present invention also provides an application of the hygroscopic and antibacterial knitted fabric prepared according to the preparation method of the hygroscopic and antibacterial knitted fabric in underwear.
[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: when preparing the hygroscopic and antibacterial knitted fabric, firstly, 2,4-diaminobenzenesulfonic acid sodium, polytetrahydrofuran and dicyclohexylmethane-4,4'-diisocyanate are polymerized, then reacted with 3-pyrrole boric acid to obtain modified polyurethane, then the modified polyurethane is prepared into fibers through a dry spinning process, then the fibers are spun into yarns, and then the yarns are prepared into grey cloth; secondly, vinyl silicone oil, mercapto polyether and butanethiol are reacted to obtain polyether-modified silicone oil, then reacted with 4-bromomethylbenzaldehyde to obtain modified silicone oil, and finally, pyrrole, p-methylbenzaldehyde, modified silicone oil and sulfuric acid are prepared into a finishing agent; and the grey cloth is finished with the finishing agent to obtain the hygroscopic and antibacterial knitted fabric.
[0018] Firstly, sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran and dicyclohexylmethane-4,4'-diisocyanate are polymerized to generate a polyurethane prepolymer containing a sulfonic acid group and a terminal isocyanate group. The sulfonic acid group has good hygroscopicity and can improve the hygroscopicity of the fabric. The polyurethane prepolymer is then capped by the reaction of the terminal isocyanate group and pyrrole in 3-pyrroleboric acid, and the terminal group is pyrroleboric acid. The dehydration of the boric acid structure can generate a hexacyclic borane, which can achieve high-density cross-linking in the polymer and improve the mechanical properties of the fabric. The hexacyclic borane has good stability at room temperature, and the presence of boron can also provide the fabric with good flame retardant properties. Secondly, silicone oil is often used in the post-finishing process of fabrics as a softening finishing agent. Vinyl silicone oil and mercapto polyether can be subjected to a mercapto-olefin click reaction to obtain a polyurethane with good properties. Sulfur-containing polyether modified silicone oil with good hydrophilicity can improve the hygroscopicity of the fabric. The reaction of polyether modified silicone oil and 4-bromomethylbenzaldehyde can generate sulfonium salt with antibacterial properties, thereby giving the fabric good antibacterial properties. The sulfonium salt with positive charge can also improve the hygroscopicity of the fabric. In addition, benzaldehyde structure can be introduced into the side chain of silicone oil. Finally, pyrrole, p-methylbenzaldehyde, modified silicone oil and sulfuric acid are prepared into a finishing agent. The grey cloth is treated with the finishing agent to obtain a hygroscopic and antibacterial knitted fabric. Pyrrole, p-methylbenzaldehyde, benzaldehyde structure on the modified silicone oil and pyrrole structure in the grey cloth undergo condensation polymerization in the presence of acid to generate a polymer with a π conjugated structure, which can give the fabric good antistatic properties. Moreover, the generation of the polymer can produce a tighter cross-linked network, which can further improve the mechanical properties of the fabric. DETAILED DESCRIPTION
[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0020] The molecular weight of the polytetrahydrofuran in the following examples and comparative examples is 2000; the model of the vinyl silicone oil is DY-V411, purchased from Shandong Dayi Chemical Co., Ltd.; the thiol polyether is methoxy polyethylene glycol thiol, with a molecular weight of 2000, purchased from Shanghai Pengshuo Biotechnology Co., Ltd.; the photoinitiator is benzil dimethyl ether; the power of the ultraviolet lamp is 100 W, and the wavelength is 365 nm; the ion exchange resin is a strongly basic anion exchange resin type I, purchased from McLean.
[0021] Example 1 A method for preparing a hygroscopic and antibacterial knitted fabric, the method comprising the following steps: (1) Sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, dicyclohexylmethane-4,4'-diisocyanate, and 3-pyrrole boric acid were weighed in a molar ratio of 1:4:10:12; polytetrahydrofuran and N,N-dimethylformamide were mixed in a mass ratio of 1:30, sodium 2,4-diaminobenzenesulfonate was added, the temperature was raised to 60°C, dicyclohexylmethane-4,4'-diisocyanate and dibutyltin dilaurate (0.02 times the mass of polytetrahydrofuran) were added, prepolymerized for 4 hours under a nitrogen atmosphere, 3-pyrrole boric acid was added, and the reaction was continued at room temperature for 8 hours. After washing with pure water for 4 times, a modified polyurethane was obtained; (2) Using N,N-dimethylformamide to prepare a spinning solution with a mass fraction of 15% of modified polyurethane; using a dry spinning process to prepare the spinning solution into modified polyurethane fibers, and then twisting and spinning the modified polyurethane fibers into yarns, and knitting the yarns into grey cloth using a warp knitting machine; the dry spinning process parameters are a temperature of 230°C and a spinning speed of 500m / min; the modified polyurethane fiber has a linear density of 40dtex; the grey cloth has a surface density of 80g / m 2 ; (3) Vinyl silicone oil, mercapto polyether, butanethiol, photoinitiator and tetrahydrofuran were mixed in a mass ratio of 1:0.5:0.2:0.02:40, and irradiated under ultraviolet light for 20 minutes to obtain polyether modified silicone oil; (4) Under argon protection, polyether modified silicone oil, 4-bromomethylbenzaldehyde, N,N-dimethylformamide, and silver tetrafluoroborate were mixed in a mass ratio of 1:0.2:20:0.2, reacted at room temperature for 12 hours, filtered and retained the filtrate, added ion exchange resin twice the mass of the polyether modified silicone oil, and stirred for 2 hours. After the stirring was completed, the modified silicone oil was obtained by filtration and vacuum rotary evaporation; (5) Pyrrole, p-methylbenzaldehyde, modified silicone oil, dioxane, and sulfuric acid were mixed in a mass ratio of 2:1:40:1000:10 to obtain a finishing agent solution. The grey cloth was added to the finishing agent solution and immersed for 24 hours. The grey cloth was subjected to a dipping and rolling process with a rolling rate of 80%. The fabric was pre-baked at 80°C for 2 minutes and then baked at 130°C for 1 minute. The fabric was washed four times with 2 mol / L ammonia water and then washed and dried to obtain a hygroscopic and antibacterial knitted fabric.
[0022] Example 2 A method for preparing a hygroscopic and antibacterial knitted fabric, the method comprising the following steps: (1) Sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, dicyclohexylmethane-4,4'-diisocyanate, and 3-pyrrole boric acid were weighed in a molar ratio of 1:4:10:12; polytetrahydrofuran and N,N-dimethylformamide were mixed in a mass ratio of 1:30, sodium 2,4-diaminobenzenesulfonate was added, the temperature was raised to 60°C, dicyclohexylmethane-4,4'-diisocyanate and dibutyltin dilaurate (0.02 times the mass of polytetrahydrofuran) were added, prepolymerized for 4 hours under a nitrogen atmosphere, 3-pyrrole boric acid was added, and the reaction was continued at room temperature for 8 hours. After washing with pure water for 4 times, a modified polyurethane was obtained; (2) Using N,N-dimethylformamide to prepare a spinning solution with a mass fraction of 15% of modified polyurethane; using a dry spinning process to prepare the spinning solution into modified polyurethane fibers, and then twisting and spinning the modified polyurethane fibers into yarns, and knitting the yarns into grey cloth using a warp knitting machine; the dry spinning process parameters are a temperature of 230°C and a spinning speed of 500m / min; the modified polyurethane fiber has a linear density of 40dtex; the grey cloth has a surface density of 80g / m 2 ; (3) Vinyl silicone oil, mercapto polyether, butanethiol, photoinitiator and tetrahydrofuran were mixed in a mass ratio of 1:0.6:0.25:0.025:45, and irradiated under ultraviolet light for 20 minutes to obtain polyether modified silicone oil; (4) Under argon protection, polyether modified silicone oil, 4-bromomethylbenzaldehyde, N,N-dimethylformamide, and silver tetrafluoroborate were mixed in a mass ratio of 1:0.25:25:0.25, reacted at room temperature for 12 hours, filtered and retained the filtrate, added with ion exchange resin 2.5 times the mass of the polyether modified silicone oil, and stirred for 2 hours. After the stirring was completed, the modified silicone oil was obtained by filtration and vacuum rotary evaporation; (5) Pyrrole, p-methylbenzaldehyde, modified silicone oil, dioxane, and sulfuric acid were mixed in a mass ratio of 2.5:1.2:40:1000:10 to obtain a finishing agent solution. The grey cloth was added to the finishing agent solution and immersed for 24 hours. The grey cloth was subjected to a dipping and rolling process with a rolling rate of 80%. The fabric was pre-baked at 80°C for 2 minutes and then baked at 125°C for 1 minute. The fabric was washed four times with 2 mol / L ammonia water and then washed and dried to obtain a hygroscopic and antibacterial knitted fabric.
[0023] Example 3 A method for preparing a hygroscopic and antibacterial knitted fabric, the method comprising the following steps: (1) Sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, dicyclohexylmethane-4,4'-diisocyanate, and 3-pyrrole boric acid were weighed in a molar ratio of 1:4:10:12; polytetrahydrofuran and N,N-dimethylformamide were mixed in a mass ratio of 1:30, sodium 2,4-diaminobenzenesulfonate was added, the temperature was raised to 60°C, dicyclohexylmethane-4,4'-diisocyanate and dibutyltin dilaurate (0.02 times the mass of polytetrahydrofuran) were added, prepolymerized for 4 hours under a nitrogen atmosphere, 3-pyrrole boric acid was added, and the reaction was continued at room temperature for 8 hours. After washing with pure water for 4 times, a modified polyurethane was obtained; (2) Using N,N-dimethylformamide to prepare a spinning solution with a mass fraction of 15% of modified polyurethane; using a dry spinning process to prepare the spinning solution into modified polyurethane fibers, and then twisting and spinning the modified polyurethane fibers into yarns, and knitting the yarns into grey cloth using a warp knitting machine; the dry spinning process parameters are a temperature of 230°C and a spinning speed of 500m / min; the modified polyurethane fiber has a linear density of 40dtex; the grey cloth has a surface density of 80g / m 2 ; (3) Vinyl silicone oil, mercapto polyether, butanethiol, photoinitiator and tetrahydrofuran were mixed in a mass ratio of 1:0.7:0.3:0.03:50, and irradiated under ultraviolet light for 20 minutes to obtain polyether modified silicone oil; (4) Under argon protection, polyether modified silicone oil, 4-bromomethylbenzaldehyde, N,N-dimethylformamide, and silver tetrafluoroborate were mixed in a mass ratio of 1:0.3:30:0.3, reacted at room temperature for 12 hours, filtered and retained the filtrate, and ion exchange resin 3 times the mass of the polyether modified silicone oil was added and stirred for 2 hours. After the stirring was completed, the modified silicone oil was obtained by filtration and reduced pressure rotary evaporation; (5) Pyrrole, p-methylbenzaldehyde, modified silicone oil, dioxane, and sulfuric acid were mixed in a mass ratio of 3:2:40:1000:10 to obtain a finishing agent solution. The grey cloth was added to the finishing agent solution and immersed for 24 hours. The grey cloth was subjected to a dipping and rolling process with a rolling rate of 80%. The fabric was pre-baked at 80°C for 2 minutes and then baked at 120°C for 1 minute. The fabric was washed four times with 2 mol / L ammonia water and then washed and dried to obtain a hygroscopic and antibacterial knitted fabric.
[0024] Comparative Example 1: The preparation method of the hygroscopic and antibacterial knitted fabric of Comparative Example 1 differs from that of Example 2 in that steps (3) and (4) are not included, and step (5) is modified as follows: pyrrole, p-methylbenzaldehyde, vinyl silicone oil, dioxane, and sulfuric acid are mixed in a mass ratio of 2.5:1.2:40:1000:10 to obtain a finishing agent solution, grey cloth is added to the finishing agent solution, immersed for 24 hours, and then subjected to a one-immersion and one-rolling process with a rolling rate of 80%, pre-baked at 80°C for 2 minutes, and then baked at 125°C for 1 minute, washed 4 times with 2 mol / L ammonia water, and then washed and dried to obtain the hygroscopic and antibacterial knitted fabric.
[0025] Comparative Example 2: The preparation method of the hygroscopic and antibacterial knitted fabric of Comparative Example 2 is different from that of Example 2 in that step (5) is modified as follows: modified silicone oil and dioxane are mixed in a mass ratio of 40:1000 to obtain a finishing agent solution, grey cloth is added to the finishing agent solution, and the fabric is subjected to a dipping and rolling process with a rolling rate of 80%. The fabric is pre-baked at 80°C for 2 minutes, and then baked at 125°C for 1 minute. The fabric is washed 4 times with 2 mol / L ammonia water, and then washed and dried to obtain the hygroscopic and antibacterial knitted fabric.
[0026] Comparative Example 3: The preparation method of the hygroscopic and antibacterial knitted fabric of Comparative Example 3 is different from that of Example 2 in that step (1) is modified as follows: sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, and dicyclohexylmethane-4,4'-diisocyanate are weighed in a molar ratio of 1:4:10; polytetrahydrofuran and N,N-dimethylformamide are mixed in a mass ratio of 1:30, sodium 2,4-diaminobenzenesulfonate is added, and after heating to 60°C, dicyclohexylmethane-4,4'-diisocyanate and dibutyltin dilaurate (0.02 times the mass of polytetrahydrofuran) are added, and prepolymerized for 4 hours under a nitrogen atmosphere to obtain a modified polyurethane.
[0027] Test Example 1: Antibacterial performance test: Test method: The fabrics prepared in the examples and comparative examples were cut into samples of 10 cm×10 cm, and the antibacterial rate of these fabric samples was tested according to the provisions of GB / T20944.2-2007 "Evaluation of antibacterial properties of textiles Part 2: Absorption method". The results are shown in Table 1.
[0028]
[0029] From the comparison of the experimental data of Examples 1 to 3 and Comparative Examples 1 to 3 in Table 1, it can be found that the moisture-absorbing and antibacterial knitted fabric prepared by the present invention has good antibacterial properties.
[0030] By comparison, the antibacterial rates of Examples 1 to 3 are greater than that of Comparative Example 1, indicating that sulfur-containing polyether-modified silicone oil can be obtained by a thiol-alkenyl click reaction of vinyl silicone oil and mercapto polyether, and that polyether-modified silicone oil and 4-bromomethylbenzaldehyde can react to generate sulfonium salts with antibacterial properties, thereby giving the fabric good antibacterial properties.
[0031] Test Example 2: Antistatic performance test: Test method: According to the standard GB / T12703-91, the antistatic performance of the fabric was tested at a humidity of 65%. The results are shown in Table 2.
[0032]
[0033] From the comparison of the experimental data of Examples 1 to 3 and Comparative Examples 1 to 3 in Table 2, it can be found that the moisture-absorbing and antibacterial knitted fabric prepared by the present invention has good antistatic performance.
[0034] By comparison, the average charge density of Examples 1 to 3 is less than that of Comparative Examples 1 to 3, indicating that pyrrole, p-methylbenzaldehyde, modified silicone oil, and sulfuric acid are prepared as a finishing agent; the grey cloth is finished with the finishing agent to obtain a hygroscopic antibacterial knitted fabric, and the pyrrole, p-methylbenzaldehyde, benzaldehyde structure on the modified silicone oil, and the pyrrole structure in the grey cloth undergo polycondensation in the presence of an acid to generate a polymer having a π conjugated structure, which can give the fabric good antistatic properties; since the modified silicone oil in Comparative Example 1 does not contain a benzaldehyde structure, in the post-finishing process, only pyrrole, p-methylbenzaldehyde, and the pyrrole structure in the grey cloth undergo polycondensation in the presence of an acid, and the generated polymer has a less conductive property than that of Examples 1 to 3; since the grey cloth in Comparative Example 3 does not contain a pyrrole structure, in the post-finishing process, only pyrrole, p-methylbenzaldehyde, and the benzaldehyde structure on the modified silicone oil undergo polycondensation in the presence of an acid to generate a polymer, and since there is no covalent bond between the polymer and the grey cloth, part of the finishing agent will be lost during the washing process, thereby further reducing the conductive property of Comparative Example 3.
[0035] Test Example 3: Test of moisture absorption performance: Test method: According to the standard GB / T21655.1-2008, the water absorption rate of the fabrics prepared in the embodiment and the comparative example was tested at a temperature of 25°C and a humidity of 65%, and the fabrics were cut into samples of 10 cm×10 cm. The results are shown in Table 3.
[0036]
[0037] From the comparison of the experimental data of Examples 1 to 3 and Comparative Examples 1 to 3 in Table 3, it can be found that the hygroscopic and antibacterial knitted fabric prepared by the present invention has good hygroscopic performance.
[0038] By comparison, the water absorption rates of Examples 1 to 3 are greater than that of Comparative Example 1, indicating that the sulfur-containing polyether-modified silicone oil with good hydrophilic properties can be obtained by the thiol-alkenyl click reaction of vinyl silicone oil and mercapto polyether, thereby improving the hygroscopic properties of the fabric. The reaction of polyether-modified silicone oil and 4-bromomethylbenzaldehyde can generate sulfonium salts with antibacterial properties, thereby giving the fabric good antibacterial properties. The sulfonium salts with positive charges can also improve the hygroscopic properties of the fabric.
[0039] Test Example 4: Mechanical properties testing Test method: The fabrics prepared in the examples and comparative examples were tested by using the shear strip method according to ASTM D5035-1995 (2003), with the length of the sample being 150 mm and the width being 25 mm, and the tensile strength was tested. The results are shown in Table 4.
[0040]
[0041] From the comparison of the experimental data of Examples 1 to 3 and Comparative Examples 1 to 3 in Table 4, it can be found that the moisture-absorbing and antibacterial knitted fabric prepared by the present invention has good mechanical properties.
[0042] By comparison, the tensile strength of Examples 1 to 3 is greater than that of Comparative Example 3, indicating that sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, and dicyclohexylmethane-4,4'-diisocyanate are polymerized to generate a polyurethane prepolymer containing a sulfonic acid group and a terminal isocyanate group, and then the polyurethane prepolymer is capped by a reaction between the terminal isocyanate group and pyrrole in 3-pyrrole boric acid, wherein the terminal group is pyrrole boric acid; dehydration of the boric acid structure can generate a hexacyclic borane, which can achieve high-density crosslinking in the polymer and improve the mechanical properties of the fabric; pyrrole, p-methylbenzaldehyde, modified silicone oil, and sulfuric acid are prepared into a finishing agent; the grey cloth is finished with the finishing agent to obtain a hygroscopic and antibacterial knitted fabric, and pyrrole, p-methylbenzaldehyde, the benzaldehyde structure on the modified silicone oil, and the pyrrole structure in the grey cloth undergo polycondensation in the presence of an acid to generate a polymer having a π conjugated structure, and a tighter crosslinking network is generated, which can further improve the mechanical properties of the fabric.
[0043] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.
Claims
1. A moisture-absorbing and antibacterial knitted fabric, characterized in that: The moisture-absorbing and antibacterial knitted fabric is obtained by finishing a grey cloth woven from modified polyurethane fibers with a finishing agent; the modified polyurethane fibers are polymerized by sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, and dicyclohexylmethane-4,4'-diisocyanate, and then reacted with 3-pyrrole boric acid to obtain modified polyurethane, which is then prepared by a dry spinning process; the finishing agent is prepared by pyrrole, p-methylbenzaldehyde, modified silicone oil, and sulfuric acid; the modified silicone oil is obtained by reacting a polyether-modified silicone oil obtained by reacting vinyl silicone oil, mercapto polyether, and butanethiol with 4-bromomethylbenzaldehyde.
2. A method for preparing a hygroscopic and antibacterial knitted fabric, characterized in that: The method comprises the following preparation steps: (1) Polytetrahydrofuran and N,N-dimethylformamide are mixed, and sodium 2,4-diaminobenzenesulfonate, dicyclohexylmethane-4,4'-diisocyanate, dibutyltin dilaurate, and 3-pyrrole boric acid are added for reaction to obtain a modified polyurethane; (2) preparing the modified polyurethane into a spinning solution; preparing the spinning solution into modified polyurethane fibers by a dry spinning process; twisting and spinning the modified polyurethane fibers into yarns; and knitting the yarns into grey fabrics by a warp knitting machine; (3) vinyl silicone oil, mercapto polyether, butanethiol, photoinitiator and tetrahydrofuran are mixed to obtain polyether modified silicone oil; (4) reacting polyether modified silicone oil, 4-bromomethylbenzaldehyde, N,N-dimethylformamide and silver tetrafluoroborate, and then adding ion exchange resin to obtain modified silicone oil; (5) Pyrrole, p-methylbenzaldehyde, modified silicone oil, dioxane and sulfuric acid are mixed to obtain a finishing agent solution, grey cloth is added to the finishing agent solution, impregnated, and then subjected to a dipping and rolling process to obtain a hygroscopic and antibacterial knitted fabric.
3. The method for preparing a hygroscopic and antibacterial knitted fabric according to claim 2, characterized in that: The preparation method of the modified polyurethane in step (1) is as follows: sodium 2,4-diaminobenzenesulfonate, polytetrahydrofuran, dicyclohexylmethane-4,4'-diisocyanate, and 3-pyrrole boric acid are weighed in a molar ratio of 1:4:10:12; polytetrahydrofuran and N,N-dimethylformamide are mixed in a mass ratio of 1:30, sodium 2,4-diaminobenzenesulfonate is added, the temperature is raised to 60°C, dicyclohexylmethane-4,4'-diisocyanate and dibutyltin dilaurate (0.02 times the mass of polytetrahydrofuran) are added, prepolymerization is carried out under a nitrogen atmosphere for 4 hours, 3-pyrrole boric acid is added, the reaction is continued at room temperature for 8 hours, and the modified polyurethane is obtained after washing with pure water 4 times; the molecular weight of the polytetrahydrofuran is 2000.
4. The method for preparing a hygroscopic and antibacterial knitted fabric according to claim 2, characterized in that: The preparation method of the grey cloth in step (2) is as follows: using N,N-dimethylformamide to prepare a spinning solution with a mass fraction of 15% of modified polyurethane; using a dry spinning process to prepare the spinning solution into modified polyurethane fibers, and then twisting and spinning the modified polyurethane fibers into yarns, and knitting the yarns into grey cloth using a warp knitting machine; the dry spinning process parameters are a temperature of 230°C and a spinning speed of 500m / min; the modified polyurethane fiber linear density is 40dtex; the surface density of the grey cloth is 80g / m 2 .
5. The method for preparing a hygroscopic and antibacterial knitted fabric according to claim 2, characterized in that: The preparation method of the polyether-modified silicone oil in step (3) is as follows: vinyl silicone oil, mercapto polyether, butanethiol, photoinitiator and tetrahydrofuran are mixed in a mass ratio of 1: (0.5-0.7): (0.2-0.3): (0.02-0.03): (40-50), and irradiated under ultraviolet light for 20 minutes to obtain polyether-modified silicone oil; the model of the vinyl silicone oil is DY-V411; the mercapto polyether is methoxy polyethylene glycol mercapto with a molecular weight of 2000; the photoinitiator is benzil dimethyl ether; the power of the ultraviolet lamp is 100 W and the wavelength is 365 nm.
6. The method for preparing a hygroscopic and antibacterial knitted fabric according to claim 2, characterized in that: The preparation method of the modified silicone oil in step (4) is as follows: under argon protection, polyether modified silicone oil, 4-bromomethylbenzaldehyde, N,N-dimethylformamide, and silver tetrafluoroborate are mixed in a mass ratio of 1: (0.2-0.3): (20-30): (0.2-0.3), reacted at room temperature for 12 hours, filtered and retained the filtrate, added with ion exchange resin 2-3 times the mass of the polyether modified silicone oil and stirred for 2 hours, and after stirring, filtered and vacuum evaporated to obtain the modified silicone oil; the ion exchange resin is a strongly basic anion exchange resin type I.
7. The method for preparing a hygroscopic and antibacterial knitted fabric according to claim 2, characterized in that: The preparation method of the hygroscopic antibacterial knitted fabric in step (5) is as follows: pyrrole, p-methylbenzaldehyde, modified silicone oil, dioxane and sulfuric acid are mixed in a mass ratio of (2-3): (1-2): 40:1000:10 to obtain a finishing agent solution, the grey cloth is added to the finishing agent solution, immersed for 24 hours, and then subjected to a dipping and rolling process, pre-baked at 80°C for 2 minutes, and then baked at 120-130°C for 1 minute, washed with 2 mol / L ammonia water for 4 times, and then washed and dried to obtain the hygroscopic antibacterial knitted fabric; the dipping and rolling process has a rolling rate of 80%.
8. Use of the hygroscopic and antibacterial knitted fabric prepared by the method for preparing the hygroscopic and antibacterial knitted fabric according to any one of claims 2 to 7 in underwear.