A water-absorbing towel and a method for manufacturing the same

Abstract

The application provides a water-absorbing towel and a preparation method thereof, and belongs to the technical field of fabrics.The method comprises the following steps: S1, immersing cotton fabric in an aqueous solution containing diallyldimethylammonium chloride and an initiator, heating and reacting, oscillating, taking out the cotton fabric after the reaction is completed, rinsing, and then airing to obtain modified cotton fabric; S2, neutralizing acrylic acid with lye, adding water to adjust the concentration to obtain an acrylic acid salt monomer solution, adding the modified cotton fabric, adding an initiator and polyethylene glycol diacrylate, heating and polymerizing, oscillating, taking out the modified cotton fabric after the reaction is completed, washing, dehydrating, and drying to obtain the water-absorbing towel.The method combines the chemical grafting with the biomimetic adhesion photocatalyst loading, so that the cotton towel has the comprehensive technical effects of super-high water-absorbing capacity, excellent washing fastness, easy dyeing, and persistent antibacterial and deodorizing.

Description

Technical Field

[0001] This invention relates to the field of textile technology, specifically to an absorbent towel and its preparation method. Background Technology

[0002] Towels, as an important household textile in the textile and light industry sector, have a large market demand. Consumers' requirements for their comprehensive performance, such as absorbency, antibacterial properties, and washability, are constantly increasing, driving the industry to continuously research and iterate on fabric modification technologies. As a daily necessity, absorbency is a core functional indicator for absorbent towels. Currently, absorbent towels on the market are mainly divided into the following categories: (1) Natural fiber towels. These towels use cotton fibers as the main raw material and utilize the inherent hydrophilic hydroxyl groups of cotton fibers to absorb water. Traditional cotton towels improve their absorbency by adjusting the yarn twist and increasing the loop height. In recent years, modified cotton has been obtained by mercerizing or alkali treating raw cotton, which improves its absorbency. Modified cotton can absorb more than 6 times its own weight in water within 10 minutes of contact.

[0003] (2) Microfiber towels. Made of polyester-nylon composite microfiber, these towels achieve rapid water absorption through capillary action. The water absorption rate of microfiber towels can reach over 150%, and some products can absorb up to 7 times their own weight in water.

[0004] (3) Superabsorbent polymer (SAP) modified towels. By combining polyacrylic acid superabsorbent resins with fibers through coating, entrainment mixing, or spinning addition, the water absorption capacity can be significantly improved. For example, using bamboo pulp fiber as a base, acrylic acid (AA), acrylamide (AM), and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) were grafted onto the cellulose-based superabsorbent material through reverse suspension polymerization, and the water absorption rate in distilled water can reach 1187.7 g / g.

[0005] (4) Functional composite towels. Through multi-layer structure design (such as base layer + absorbent layer + antibacterial layer) or the addition of nanomaterials (nano silver, nano TiO2, graphene, etc.), multi-functional integration such as water absorption, antibacterial and quick drying is achieved.

[0006] While the aforementioned technologies have made some progress in terms of water absorption, existing techniques add superabsorbent polymers (SAP) to the fiber surface through coating or encapsulation, which is a physical adsorption process with weak bonding. After repeated washing, SAP particles easily detach, leading to a sharp decline in absorbency. Although microfiber towels absorb water quickly, their main components are hydrophobic synthetic fibers such as polyester / nylon, which have poor moisture absorption. They rely primarily on capillary action rather than the inherent properties of the fibers to absorb water, and are prone to developing odors and bacterial growth after prolonged use. Summary of the Invention

[0007] The purpose of this invention is to propose an absorbent towel and its preparation method, which solves the technical problems of easy detachment of the traditional towel's SAP physical bonding and easy bacterial growth of synthetic fibers. By combining chemical grafting with biomimetic adhesion photocatalytic loading, the cotton towel has the comprehensive technical effects of ultra-high absorbency, excellent wash fastness, easy dyeing and long-lasting antibacterial and deodorizing properties.

[0008] The technical solution of this invention is implemented as follows: This invention provides a method for preparing an absorbent towel, comprising the following steps: S1. Immerse the cotton fabric in an aqueous solution containing diallyl dimethyl ammonium chloride and an initiator, heat the reaction, and continuously shake the reaction system to ensure uniform modification. After the reaction is completed, take out the cotton fabric, rinse it several times to remove unreacted monomers, dehydrate it, and then air dry it to obtain the modified cotton fabric. S2. Neutralize the acrylic acid with alkali solution to a neutralization degree of 50-60%, add water to adjust the concentration of acrylic acid monomer to obtain an acrylate monomer solution, add modified cotton fabric, add initiator and polyethylene glycol diacrylate, heat and polymerize, continuously shake the reaction system to ensure uniform reaction, after the reaction is completed, take out the modified cotton fabric, wash, dehydrate and dry to obtain an absorbent towel.

[0009] As a further improvement of the present invention, the mass ratio of the cotton fabric, diallyl dimethyl ammonium chloride and the initiator in step S1 is 1:0.5-0.7:0.01-0.015; the initiator is K2S2O8 and NaHSO3, with a mass ratio of 1:0.3-0.5.

[0010] As a further improvement of the present invention, the heating reaction in step S1 is carried out at a temperature of 30-35°C for 0.5-1.5 hours and a bath ratio of 1:15-25.

[0011] As a further improvement of the present invention, the alkaline solution in step S2 is a 20-40 wt% NaOH or KOH solution, the concentration of acrylic monomer is adjusted to 5-10 wt% by adding water, the mass ratio of the modified cotton fabric, polyethylene glycol diacrylate and the initiator is 1:0.1-0.2:0.001-0.0015, and the initiator is at least one of sodium persulfate, potassium persulfate and ammonium persulfate.

[0012] As a further improvement of the present invention, the heating polymerization reaction in step S2 is carried out at a temperature of 65-75°C for 5-7 hours, and the bath ratio of the acrylate monomer solution to the modified cotton fabric is 1:10-20.

[0013] As a further improvement of the present invention, step S3 is also included, which is as follows: the modified photocatalyst is added to water, ultrasonically dispersed evenly, immersed in an absorbent towel, soaked, removed, washed, dehydrated, and dried to obtain the product.

[0014] As a further improvement of the present invention, the mass ratio of the modified photocatalyst and the absorbent towel in step S3 is 2-5:100, and the soaking time is 8-12 hours.

[0015] As a further improvement of the present invention, the preparation method of the modified photocatalyst in step S3 is as follows: The nano-photocatalyst was added to a Tris-HCl solution, dopamine hydrochloride was added, the mixture was heated and stirred, centrifuged, washed, and dried to obtain the modified photocatalyst.

[0016] As a further improvement of the present invention, the pH value of the Tris-HCl solution is 8.5-9.5, the particle size of the nano-photocatalyst is <50nm, the mass ratio of the nano-photocatalyst to dopamine hydrochloride is 10:1-2, and the temperature of the heating and stirring reaction is 40-50℃, and the time is 3-5h.

[0017] The present invention further protects an absorbent towel prepared by the above-described preparation method.

[0018] The present invention has the following beneficial effects: 1. This invention utilizes the electrostatic self-assembly between the cationic polyelectrolyte layer formed by grafting diallyl dimethyl ammonium chloride and the anionic polyacrylate. At the same time, the residual double bonds can undergo graft copolymerization with polyacrylate, achieving strong interfacial bonding without the need for traditional crosslinking agents. The successfully grafted polyacrylate SAP layer has a significantly improved water absorption rate and excellent durability and washability, and the SAP layer is difficult to detach.

[0019] 2. The diallyl dimethyl ammonium chloride quaternary ammonium salt structure of this invention improves the antibacterial properties of the towel. Simultaneously, the nano-photocatalyst continuously generates ·OH and ·O2 under light irradiation. - It contains reactive oxygen species (ROS) that kill bacteria and decompose organic odor molecules; the polydopamine adhesion layer ensures that the photocatalyst is washable and does not fall off, thus improving the antibacterial properties of the absorbent towel.

[0020] 3. The addition of polyethylene glycol diacrylate in this invention adjusts the rigidity and pore structure of the SAP crosslinking network, acting as a crosslinking agent to avoid the "plastic feel" of traditional highly crosslinked SAP and maintain the soft touch of cotton fabrics.

[0021] 4. This invention utilizes graft polymerization to introduce more cationic groups diallyl dimethyl ammonium chloride, which is beneficial for achieving high cationicity and effectively promoting dye adsorption, thereby improving the dyeability of cotton fabrics. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 The infrared spectrum of the modified cotton fabric obtained in step S1 of Example 1 is shown.

[0024] Figure 2 This is a SEM image of the absorbent towel prepared in Example 1. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0026] This embodiment provides a method for preparing an absorbent towel, including the following steps: S1. Immerse 10g of cotton fabric (25tex) in 150g of an aqueous solution containing 5g of diallyl dimethyl ammonium chloride and 0.1g of initiator (the initiator is K2S2O8 and NaHSO3, with a mass ratio of 1:0.3), heat to 30℃, stir and react for 1.5h, and continuously shake the reaction system to ensure uniform modification. After the reaction is completed, take out the cotton fabric, rinse it several times with water to remove unreacted monomers, dehydrate it, and then air dry it to obtain the modified cotton fabric. Figure 1 The infrared spectrum of the modified cotton fabric obtained.

[0027] S2. Neutralize acrylic acid with 20wt% NaOH solution to a neutralization degree of 50%, add water to adjust the concentration of acrylic acid monomer to 5wt%, and obtain acrylate monomer solution. Add 10g modified cotton fabric, 0.01g sodium persulfate and 1g polyethylene glycol diacrylate 400 to 200g acrylate monomer solution, heat to 65℃, and polymerize for 7h. The reaction system is continuously shaken to ensure uniform reaction. After the reaction is completed, take out the modified cotton fabric, rinse it several times with water to remove unreacted monomers, dehydrate and dry to obtain absorbent towel. Figure 2 The image shows the SEM image of the prepared absorbent towel. Example 2

[0028] This embodiment provides a method for preparing an absorbent towel, including the following steps: S1. Immerse 10g of cotton fabric (25tex) in 250g of an aqueous solution containing 7g of diallyl dimethyl ammonium chloride and 0.15g of initiator (the initiator is K2S2O8 and NaHSO3, with a mass ratio of 1:0.5), heat to 35℃, stir and react for 0.5h, and continuously shake the reaction system to ensure uniform modification. After the reaction is completed, take out the cotton fabric, rinse it several times with water to remove unreacted monomers, dehydrate it, and then air dry it to obtain the modified cotton fabric. S2. Neutralize acrylic acid with 40wt% KOH solution to a neutralization degree of 50%, add water to adjust the concentration of acrylic acid monomer to 10wt%, and obtain acrylate monomer solution. Add 10g modified cotton fabric to 100g acrylate monomer solution, add 0.015g potassium persulfate and 2g polyethylene glycol diacrylate 400, heat to 75℃, and polymerize for 5h. The reaction system is continuously shaken to ensure uniform reaction. After the reaction is completed, take out the modified cotton fabric, rinse it several times with clean water to remove unreacted monomers, dehydrate, and dry to obtain absorbent towel. Example 3

[0029] This embodiment provides a method for preparing an absorbent towel, including the following steps: S1. Immerse 10g of cotton fabric (25tex) in 200g of an aqueous solution containing 6g of diallyl dimethyl ammonium chloride and 0.12g of initiator (the initiator is K2S2O8 and NaHSO3, with a mass ratio of 1:0.4), heat to 32℃, stir and react for 1h, and continuously shake the reaction system to ensure uniform modification. After the reaction is completed, take out the cotton fabric, rinse it several times with water to remove unreacted monomers, dehydrate it, and then air dry it to obtain the modified cotton fabric. S2. Neutralize acrylic acid with 30wt% NaOH solution to a neutralization degree of 55%, add water to adjust the concentration of acrylic acid monomer to 7wt%, and obtain acrylate monomer solution. Add 10g modified cotton fabric to 150g acrylate monomer solution, add 0.012g ammonium persulfate and 1.5g polyethylene glycol diacrylate 400 (crosslinking agent), heat to 70℃, and polymerize for 6h. The reaction system is continuously shaken to ensure uniform reaction. After the reaction is completed, take out the modified cotton fabric, rinse it several times with clean water to remove unreacted monomers, dehydrate, and dry to obtain absorbent towel. Example 4

[0030] This embodiment provides a method for preparing an absorbent towel, including the following steps: S1. Immerse 10g of cotton fabric (25tex) in 200g of an aqueous solution containing 6g of diallyl dimethyl ammonium chloride and 0.12g of initiator (the initiator is K2S2O8 and NaHSO3, with a mass ratio of 1:0.4), heat to 32℃, stir and react for 1h, and continuously shake the reaction system to ensure uniform modification. After the reaction is completed, take out the cotton fabric, rinse it several times with water to remove unreacted monomers, dehydrate it, and then air dry it to obtain the modified cotton fabric. S2. Neutralize acrylic acid with 30wt% NaOH solution to a neutralization degree of 55%, add water to adjust the concentration of acrylic acid monomer to 7wt%, and obtain acrylate monomer solution. Add 10g modified cotton fabric, 0.012g ammonium persulfate and 1.5g polyethylene glycol diacrylate 400 to 150g acrylate monomer solution, heat to 70℃, and polymerize for 6h. The reaction system is continuously shaken to ensure uniform reaction. After the reaction is completed, take out the modified cotton fabric, rinse it several times with water to remove unreacted monomers, dehydrate and dry to obtain absorbent towel.

[0031] S3. Add 1g of nano-photocatalyst (nano-TiO2, particle size <50nm) to a Tris-HCl solution with a pH of 8.5-9.5, add 0.15g of dopamine hydrochloride, heat to 45℃, stir and react for 4h, centrifuge, wash, and dry to obtain the modified photocatalyst.

[0032] S4. Add 0.3g of modified photocatalyst to 150g of water, ultrasonically disperse for 30min, soak in 10g of absorbent towel for 10h, remove, wash, dehydrate, and dry to obtain the product.

[0033] Comparative Example 1 The only difference from Example 3 is that step S1 was not performed.

[0034] Specifically as follows: Acrylic acid was neutralized to a degree of neutralization of 55% with 30wt% NaOH solution. Water was added to adjust the concentration of acrylic monomer to 7wt% to obtain an acrylate monomer solution. 10g of cotton fabric, 0.012g of ammonium persulfate and 1.5g of polyethylene glycol diacrylate were added to 150g of acrylate monomer solution. The mixture was heated to 70℃ and the polymerization reaction was carried out for 6 hours. The reaction system was continuously shaken to ensure uniform reaction. After the reaction was completed, the modified cotton fabric was taken out, rinsed several times with clean water to remove unreacted monomers, dehydrated and dried to obtain an absorbent towel.

[0035] Comparative Example 2 The only difference from Example 3 is that step S2 was not performed.

[0036] Specifically as follows: 10g of cotton fabric (25tex) was immersed in 200g of an aqueous solution containing 6g of diallyl dimethyl ammonium chloride and 0.12g of initiator (the initiator was K2S2O8 and NaHSO3 in a mass ratio of 1:0.4). The solution was heated to 32℃ and stirred for 1h. The reaction system was continuously shaken to ensure uniform modification. After the reaction was completed, the cotton fabric was removed, rinsed several times with water to remove unreacted monomers, dehydrated, and then dried to obtain the modified cotton fabric.

[0037] Test Example 1 The products obtained in Examples 1-4 and Comparative Examples 1-2 were subjected to performance tests, and the results are shown in Table 1.

[0038] 1. Water absorption performance The mass of the product sample is recorded as m1. After standing in distilled water for 1 hour to remove excess water, its mass is recorded as m2. The apparent water absorption ratio Q of the fabric is calculated according to formula (1). app (g / g).

[0039] Q app =(m2-m1) / m1 (1) 2. Washability After washing the product sample 50 times with water, the apparent water absorption ratio Q of the fabric was tested. app (g / g).

[0040] 3. Antibacterial properties According to the test method GB / T20944.3-2008 "Evaluation of antimicrobial properties of textiles - Part 3: Shaking method", the number of colonies was recorded to calculate the antimicrobial rate. The test bacteria were Staphylococcus aureus (ATCC6538) and Escherichia coli (ATCC25922).

[0041] 4. Dyeing performance Dyeing formula: Fluorescent pink R17 2% (omf), acrylic binder LYOPRINT PBA 20g / L, liquor ratio 1:30, using conventional dyeing steps (fluorescent dye and fabric mixed in water, 80℃, treated for 30min, binder added, treated for 4min, sampled, dehydrated, dried at 80℃, baked at 145℃ for 4min), then fixed with a color-fixing formula: wet rubbing fastness enhancer 3% (omf), pH 4-5, temperature at room temperature, time 30min, liquor ratio 1:10.

[0042] In D 65 The dyeing K / S value was determined using a Datacolor SF650 colorimeter under different light sources and at a 10° viewing angle.

[0043] Table 1

[0044] As can be seen from the table above, the products obtained in Examples 1-4 of this invention have good water absorption, water washability, antibacterial properties and easy dyeing properties.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an absorbent towel, characterized in that, Includes the following steps: S1. Immerse the cotton fabric in an aqueous solution containing diallyl dimethyl ammonium chloride and an initiator, heat the reaction, and continuously shake the reaction system to ensure uniform modification. After the reaction is completed, take out the cotton fabric, rinse it several times to remove unreacted monomers, dehydrate it, and then air dry it to obtain the modified cotton fabric. S2. Neutralize the acrylic acid with alkali solution to a neutralization degree of 50-60%, add water to adjust the concentration of acrylic acid monomer to obtain an acrylate monomer solution, add modified cotton fabric, add initiator and polyethylene glycol diacrylate, heat and polymerize, continuously shake the reaction system to ensure uniform reaction, after the reaction is completed, take out the modified cotton fabric, wash, dehydrate and dry to obtain an absorbent towel.

2. The preparation method according to claim 1, characterized in that, In step S1, the mass ratio of the cotton fabric, diallyl dimethyl ammonium chloride, and the initiator is 1:0.5-0.7:0.01-0.015; the initiator is K2S2O8 and NaHSO3, with a mass ratio of 1:0.3-0.

5.

3. The preparation method according to claim 1, characterized in that, The heating reaction in step S1 is carried out at a temperature of 30-35°C for 0.5-1.5 hours, with a bath ratio of 1:15-25.

4. The preparation method according to claim 1, characterized in that, In step S2, the alkaline solution is a 20-40 wt% NaOH or KOH solution, the concentration of acrylic monomer is adjusted to 5-10 wt% by adding water, the mass ratio of the modified cotton fabric, polyethylene glycol diacrylate and the initiator is 1:0.1-0.2:0.001-0.0015, and the initiator is at least one of sodium persulfate, potassium persulfate and ammonium persulfate.

5. The preparation method according to claim 1, characterized in that, The heating polymerization reaction in step S2 is carried out at a temperature of 65-75°C for 5-7 hours, and the bath ratio of the acrylate monomer solution to the modified cotton fabric is 1:10-20.

6. The preparation method according to claim 1, characterized in that, It also includes step S3, which is as follows: the modified photocatalyst is added to water, ultrasonically dispersed evenly, immersed in an absorbent towel, soaked, removed, washed, dehydrated, and dried to obtain the product.

7. The preparation method according to claim 6, characterized in that, In step S3, the mass ratio of the modified photocatalyst to the absorbent towel is 2-5:100, and the soaking time is 8-12 hours.

8. The preparation method according to claim 6, characterized in that, The preparation method of the modified photocatalyst in step S3 is as follows: The nano-photocatalyst was added to a Tris-HCl solution, dopamine hydrochloride was added, the mixture was heated and stirred, centrifuged, washed, and dried to obtain the modified photocatalyst.

9. The preparation method according to claim 8, characterized in that, The pH value of the Tris-HCl solution is 8.5-9.5, the particle size of the nano-photocatalyst is <50nm, the mass ratio of the nano-photocatalyst to dopamine hydrochloride is 10:1-2, and the heating and stirring reaction temperature is 40-50℃ for 3-5h.

10. An absorbent towel prepared by any one of claims 1-9.

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