A degradable material cleaning wipe and a preparation method thereof

Abstract

The present application belongs to the technical field of cleaning cloth, and particularly relates to a degradable material cleaning towel cloth and a preparation method thereof. Cellulose pulp, N-methyl morpholine-N-oxide aqueous solution, a modifying liquid and a fixing agent are uniformly mixed to obtain a fiber spinning liquid, and the modified lyocell fiber is prepared by using the fiber spinning liquid; the modified lyocell fiber and cotton fiber are spun by using the agglomeration spinning to obtain a blended yarn, and the degradable material cleaning towel cloth is prepared by using the blended yarn for weaving; the modifying liquid comprises the following raw materials: quaternary ammonium carboxymethyl chitosan, modified nano silicon dioxide, polyvinyl alcohol and deionized water; the cleaning towel cloth provided by the present application not only has good water absorption performance, but also has excellent wear resistance, breaking strength and antibacterial performance, and meanwhile, good biodegradability is maintained.

Description

Technical Field

[0001] The invention belongs to the technical field of cleaning towels, and in particular relates to a cleaning towel made of a degradable material and a preparation method thereof. Background Art

[0002] Cleaning wipes are a product widely used in daily life and industrial fields, and their performance requirements are high. First, cleaning wipes need to have good water absorption to quickly absorb liquids; second, due to the frequent friction and stretching during the cleaning process, cleaning wipes need to have excellent wear resistance and breaking strength to ensure their service life; in addition, cleaning wipes are prone to breeding bacteria during use, so antibacterial properties are also an important functional requirement. Traditional cleaning wipes are mostly made of synthetic fibers or natural fibers. Although the former has excellent mechanical properties, it is non-degradable and has poor antibacterial properties; although the latter is degradable, its mechanical and antibacterial properties often cannot meet the high-demand usage scenarios.

[0003] As a natural polymer material, cellulose is an ideal alternative to traditional synthetic fibers due to its widespread availability, renewable nature, and biodegradability. Lyocell, a novel regenerated cellulose fiber, is produced using cellulose as a raw material through the N-methylmorpholine-N-oxide (NMMO) solvent spinning process. Lyocell combines the comfort and biodegradability of natural fibers with the high strength and abrasion resistance of synthetic fibers, making it widely used in the textile industry. However, traditional lyocell fibers still have shortcomings in certain properties, such as poor antibacterial properties, which limits their use in areas with high hygiene requirements, such as cleaning products. Furthermore, while the breaking strength and abrasion resistance of pure lyocell fibers are superior to those of natural cotton fibers, they still need to be further improved for high-intensity use.

[0004] With the increasing severity of global environmental problems, the research and development of biodegradable materials has become a hot topic in the field of materials science. Traditional synthetic fiber materials, such as polyester and polyamide, have excellent mechanical properties and durability, but their non-degradability leads to serious environmental pollution problems. This is especially true in the field of disposable products, such as cleaning wipes and wet wipes. The waste generated after large-scale use is difficult to degrade naturally, placing tremendous pressure on the ecological environment. Therefore, the development of biodegradable fiber materials that combine excellent performance with environmental friendliness has become an urgent need. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention provides a biodegradable cleaning cloth and its preparation method. By combining cellulose pulp with a functional modification liquid, a modified lyocell fiber with excellent overall performance is prepared. This fiber is then blended with cotton fiber, and a high-performance blended yarn is produced using concentrated spinning technology. This final, biodegradable cleaning cloth is woven. This cleaning cloth not only retains the biodegradability of natural fibers but also significantly improves its water absorption, abrasion resistance, breaking strength, and antibacterial properties through functional modification. This provides new ideas and technical support for the development of environmentally friendly, high-performance cleaning products.

[0006] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are:

[0007] A method for preparing a cleaning cloth made of a degradable material comprises the following steps:

[0008] Step S1: cellulose pulp, an aqueous solution of N-methylmorpholine-N-oxide, a modifying solution, and a fixing agent are uniformly mixed to obtain a fiber spinning solution, the fiber spinning solution is then added to a screw extruder and extruded through a spinneret to produce raw fibers, which are then coagulated, washed with alcohol, washed with water, oiled, and dried to obtain modified lyocell fibers;

[0009] Step S2: spinning the modified lyocell fiber and the cotton fiber by compact spinning to obtain a blended yarn, and then weaving the blended yarn;

[0010] The modified solution in step S1 comprises the following raw materials in parts by weight: 5-10 parts of quaternized carboxymethyl chitosan, 0.5-1.5 parts of modified nano-silica, 4-8 parts of polyvinyl alcohol, and 80-120 parts of deionized water;

[0011] The preparation method of the modified nano-silica is:

[0012] Under stirring conditions, citric acid is dispersed in anhydrous ethanol, and then 5,6-epoxyhexyltriethoxysilane is added. The temperature is raised to 60-80°C, the reaction is carried out for 6-8 hours, and the mixture is cooled to room temperature. Then, nano-silica sol and deionized water are added. After ultrasonic dispersion, the reaction is continued at 50-70°C for 5-7 hours, the mixture is cooled to room temperature, and post-treated to obtain modified nano-silica.

[0013] In order to overcome the limitations of lyocell fibers, the present invention modifies cellulose pulp and significantly improves its performance by introducing functional additives and chemically modifying the fiber surface. Quaternized carboxymethyl chitosan, as a cationic polysaccharide, not only has good water solubility and film-forming properties, but also has excellent antibacterial properties. Its introduction into the fiber spinning solution can give it a lasting antibacterial function during the fiber forming process. In addition, nano-silica, as a common inorganic nanomaterial, is often used to enhance the mechanical properties of polymer materials due to its high specific surface area and excellent mechanical properties. By modifying the surface of nano-silica and introducing citric acid and 5,6-epoxyhexyltriethoxysilane, its compatibility with the cellulose matrix can be improved, thereby further improving the mechanical properties of the fiber.

[0014] Based on fiber modification, blending modified lyocell fibers with natural cotton fibers combines the advantages of both, creating a blended yarn with more balanced properties. Cotton, a traditional natural fiber, offers excellent moisture absorption and comfort, but its strength and abrasion resistance are relatively low. Blending modified lyocell fibers not only compensates for the mechanical deficiencies of cotton fibers but also further enhances the overall performance of the blended yarn. Condensed spinning technology, an advanced spinning process, effectively reduces yarn hairiness and improves yarn uniformity and strength, laying the foundation for the subsequent production of high-performance cleaning wipes.

[0015] Furthermore, in the preparation process of modified nano-silica, the mass ratio of citric acid, 5,6-epoxyhexyltriethoxysilane, nano-silica sol and deionized water is 20:20-30:200-250:20-30, the volume ratio of anhydrous ethanol to deionized water is 20:5-15, the ultrasonic power during the ultrasonic dispersion is 150-250 W, and the ultrasonic time is 10-20 min.

[0016] Furthermore, in step S1, the mass ratio of the cellulose pulp, N-methylmorpholine-N-oxide aqueous solution, the modifying liquid, and the fixing agent is 10-15:75:4-8:0.5-0.8; the modifying liquid is prepared by adding polyvinyl alcohol to deionized water, heating to 70-90°C, stirring until dissolved, then adding quaternized carboxymethyl chitosan, lowering the temperature to 50-70°C, stirring for 20-40 minutes, then adding modified nano-silica, ultrasonically treating for 10-20 minutes, continuing to stir at 50-70°C for 20-40 minutes, cooling, and filtering to obtain the modifying liquid.

[0017] Furthermore, the preparation method of the quaternized carboxymethyl chitosan is as follows: under stirring conditions, carboxymethyl chitosan is dissolved in deionized water, 2,3-epoxypropyltrimethylammonium chloride is added, the temperature is increased to 50-70°C, the reaction is carried out for 20-30 hours, the reaction is cooled to room temperature, and post-processed to obtain quaternized carboxymethyl chitosan; the mass ratio of the carboxymethyl chitosan and 2,3-epoxypropyltrimethylammonium chloride is 10:1-2, and the mass volume ratio of the carboxymethyl chitosan to deionized water is 0.8-1.2 g / mL.

[0018] The cleaning cloth made of the degradable material provided by the present invention can also be subjected to an anti-wrinkle treatment or a pre-shrinkage treatment to further improve its comprehensive performance.

[0019] The present invention has the following beneficial effects:

[0020] Lyocell fiber itself is inherently biodegradable and has good hygroscopicity. Cellulose pulp, the primary raw material for Lyocell fiber, forms the foundation of the fiber structure. An aqueous solution of N-methylmorpholine-N-oxide, used as a solvent, helps dissolve the cellulose pulp, forming a uniform spinning solution that prepares the fibers for subsequent fiber formation.

[0021] In the modified solution, quaternized carboxymethyl chitosan plays multiple roles. Carboxymethyl chitosan itself has certain hydrophilicity and antibacterial properties, and the introduction of quaternary ammonium groups enhances its antibacterial properties. Quaternary ammonium groups are positively charged, while bacterial surfaces are typically negatively charged. Through electrostatic attraction, quaternized carboxymethyl chitosan can adsorb on the bacterial surface, disrupting the structure of the bacterial cell membrane and causing leakage of intracellular substances, thereby achieving an antibacterial effect. At the same time, its hydrophilicity helps improve the overall water absorption capacity of the fiber. Furthermore, quaternized carboxymethyl chitosan has good biocompatibility and degradability, and synergistically works with raw materials such as cellulose pulp to ensure the antibacterial and water absorption properties of the cleaning cloth while maintaining its biodegradability. Modified nanosilica is also crucial in this process. The introduction of citric acid on the surface of nano-silica particles increases the active sites and hydrophilicity of their surface, while the introduction of 5,6-epoxyhexyltriethoxysilane enables them to better react chemically with fiber molecules, enhancing their compatibility and bonding with the fibers, allowing the nano-silica particles to be evenly dispersed in the fibers and fully exerting their reinforcing effect. The nano-size effect of the nano-silica particles can also effectively hinder the expansion of cracks within the fibers, improving the wear resistance and breaking strength of the fibers. The addition of modified nano-silica can significantly improve the wear resistance, breaking strength and water absorption properties of the cleaning cloth. In addition, quaternized carboxymethyl chitosan and modified nano-silica can also combine with each other through electrostatic interactions or hydrogen bonds to form a synergistic network structure, further enhancing the mechanical properties and antibacterial properties of the fibers. Polyvinyl alcohol has good film-forming and adhesive properties, which can better combine other raw materials in the system, thereby enhancing the interaction between fibers, which has a positive impact on the improvement of wear resistance and breaking strength. It also has a certain degree of hydrophilicity, which synergizes with other hydrophilic raw materials to further improve the product's water absorption properties.

[0022] Cotton fiber, with its naturally good water absorption and comfort properties, is blended with modified lyocell fiber through compact spinning to create a yarn that complements its strengths. The presence of cotton fiber increases the yarn's water absorption, while the improved properties of modified lyocell fiber impart enhanced abrasion resistance to the blended yarn. During the weaving process, the structure formed by this blended yarn allows the cleaning cloth to comprehensively reflect the excellent properties of each raw material. The result is a cleaning cloth that not only has good water absorption, but also excellent abrasion resistance, breaking strength, and antibacterial properties, while maintaining good biodegradability. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The raw materials used in the following examples are all common commercially available products. Example 1

[0024] A method for preparing a cleaning cloth made of a degradable material comprises the following steps:

[0025] Step S1: uniformly mixing cellulose pulp, N-methylmorpholine-N-oxide aqueous solution, modifying liquid, and fixing agent to obtain fiber spinning solution, then adding the fiber spinning solution into a screw extruder and extruding raw yarn through a spinneret, and the raw yarn is subjected to coagulation molding, alcohol washing, water washing, oiling, and drying processes to obtain modified lyocell fiber; wherein the mass ratio of the cellulose pulp, N-methylmorpholine-N-oxide aqueous solution, modifying liquid, and fixing agent is 13:75:6:0.7, the mass fraction of the N-methylmorpholine-N-oxide aqueous solution is 50%; the cellulose pulp is polymerized The invention relates to hardwood pulp with a DP550 degree and a moisture regain of 7.2%; the fixing agent is triphenylmethane triisocyanate; the spinning system has an air gap length of 7 cm, a spinning speed of 40 m / min, a spinning temperature of 90°C, a spinneret aperture of 60 μm, a capillary length of 600 μm, the ejected filaments are vertically stretched in the air, the spinneret draft ratio is 20, and the filaments enter a coagulation bath for coagulation and forming, the coagulation bath concentration is 15 wt% NMMO aqueous solution, and the coagulation bath temperature is 7°C; the alcohol washing, water washing, oiling, drying and other processes can all be carried out using conventional techniques in the art;

[0026] Step S2: spinning modified lyocell fiber and cotton fiber by compact spinning to obtain blended yarn, and then using the blended yarn to weave a cleaning towel; wherein the modified lyocell fiber and cotton fiber both have a fineness of 1.5 dtex and a length of 34 mm, the mass ratio of the modified lyocell fiber to the cotton fiber during blending is 1:1, and the twist of the blended yarn is 35 twists / 10 cm; the blended yarn is used as warp yarn and weft yarn respectively to weave a plain weave fabric, the yarn count is controlled to be 80 in English, the warp yarn density is 600 yarns / 10 cm, and the weft yarn density is 365 yarns / 10 cm;

[0027] The modified solution in step S1 comprises the following raw materials in parts by weight: 8 parts of quaternized carboxymethyl chitosan, 1 part of modified nano-silica, 6 parts of polyvinyl alcohol, and 100 parts of deionized water;

[0028] The preparation method of the modified nano-silica is as follows: under stirring conditions, citric acid is dispersed in anhydrous ethanol, 5,6-epoxyhexyltriethoxysilane is added, the temperature is raised to 70°C, the reaction is carried out for 7 hours, and the reaction is naturally cooled to room temperature. Then, nano-silica sol (solid content of 25%, average particle size of 86nm, pH 8.9) and deionized water are added, and after ultrasonic dispersion, the reaction is continued at 60°C for 6 hours, the reaction is naturally cooled to room temperature, and the reaction is carried out by centrifugation. The precipitate is collected and washed by centrifugation with anhydrous ethanol and deionized water in sequence. The centrifugal speed during the above centrifugation process is 10,000 rpm and the centrifugal time is 20 minutes. The reaction mixture was centrifuged and washed for 10 minutes, and then vacuum-dried at 60°C to a constant weight. After grinding, the mixture was passed through an 800-mesh sieve to obtain modified nano-silica. The mass ratio of citric acid, 5,6-epoxyhexyltriethoxysilane, nano-silica sol, and deionized water was 20:25:230:25, the volume ratio of anhydrous ethanol to deionized water was 20:10, the ultrasonic power during ultrasonic dispersion was 200W, and the ultrasonic time was 15 minutes. The grinding process can be carried out using conventional techniques in the art. The grafting rate of the modified nano-silica was measured by thermogravimetric analysis to be 12.4%.

[0029] The preparation method of the quaternized carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan (with an active ingredient content of 99%, purchased from Shaanxi Chenming Biotechnology Co., Ltd.) in deionized water under stirring, adding 2,3-epoxypropyltrimethylammonium chloride, raising the temperature to 60° C., reacting for 24 hours, naturally cooling to room temperature, then adding anhydrous ethanol in an equal volume to the deionized water for precipitation, centrifuging the precipitate, redissolving it in deionized water, precipitating it again with anhydrous ethanol, and drying it at 60° C. under vacuum conditions to a constant weight to obtain the quaternized carboxymethyl chitosan; wherein the mass ratio of the carboxymethyl chitosan to 2,3-epoxypropyltrimethylammonium chloride is 10:1.5, the mass-to-volume ratio of the carboxymethyl chitosan to deionized water is 1 g / mL, the centrifugal speed is 12,000 rpm, and the centrifugal time is 5 minutes; and elemental analysis test shows that the grafting rate of the quaternized carboxymethyl chitosan is 9.5%;

[0030] The modified liquid is prepared by adding polyvinyl alcohol (degree of polymerization 1650-1850, model 1788, purchased from Jinan Yuyi Chemical Co., Ltd.) to deionized water, heating to 80°C, stirring until dissolved, adding quaternized carboxymethyl chitosan, lowering the temperature to 60°C, stirring for 30 minutes, then adding modified nano-silica, ultrasonically treating for 15 minutes at an ultrasonic power of 250W, continuing to stir at 60°C for 30 minutes, naturally cooling to room temperature, filtering through a filter to remove undispersed particles, and obtaining a modified liquid. Example 2

[0031] A method for preparing a cleaning cloth made of a degradable material comprises the following steps:

[0032] Step S1: uniformly mixing cellulose pulp, an N-methylmorpholine-N-oxide aqueous solution, a modifying solution, and a fixing agent to obtain a fiber spinning solution, then adding the fiber spinning solution to a screw extruder and extruding raw yarn through a spinneret. The raw yarn is subjected to coagulation, alcohol washing, water washing, oiling, and drying to obtain modified lyocell fiber. The mass ratio of the cellulose pulp, the N-methylmorpholine-N-oxide aqueous solution, the modifying solution, and the fixing agent is 10:75:4:0.5, and the mass fraction of the N-methylmorpholine-N-oxide aqueous solution is 55%. The cellulose pulp is hardwood pulp with a degree of polymerization (DP) of 550 and a moisture regain of 7.2%. The fixing agent is triphenylmethane triisocyanate. All other aspects are the same as those of Example 1.

[0033] Step S2: spinning the modified lyocell fiber and the cotton fiber by compact spinning to obtain a blended yarn, and then weaving the blended yarn to obtain a cleaning towel; the rest is the same as in Example 1;

[0034] The modified solution in step S1 comprises the following raw materials in parts by weight: 5 parts of quaternized carboxymethyl chitosan, 0.5 parts of modified nano-silica, 4 parts of polyvinyl alcohol, and 80 parts of deionized water;

[0035] The preparation method of the modified nano-silica is as follows: citric acid is dispersed in anhydrous ethanol under stirring conditions, 5,6-epoxyhexyltriethoxysilane is added, the temperature is raised to 80°C, the reaction is carried out for 6 hours, and the reaction is naturally cooled to room temperature. Then, nano-silica sol (solid content of 25%, average particle size of 86nm, pH 8.9) and deionized water are added, and the reaction is continued at 70°C for 5 hours after ultrasonic dispersion, and the reaction is naturally cooled to room temperature. The precipitate is collected and centrifuged and washed with anhydrous ethanol and deionized water in sequence. The centrifugal speed during the above centrifugation process is 10,000 rpm and the centrifugal time is 20 minutes. The reaction mixture was centrifuged and washed for 10 minutes, and then vacuum-dried at 60° C. to constant weight. After grinding, the mixture was sieved through an 800-mesh sieve to obtain modified nano-silica. The mass ratio of citric acid, 5,6-epoxyhexyltriethoxysilane, nano-silica sol, and deionized water was 20:20:200:20, the volume ratio of anhydrous ethanol to deionized water was 20:5, the ultrasonic power during ultrasonic dispersion was 150 W, and the ultrasonic time was 20 minutes. The grinding process can be carried out using conventional techniques in the art. The grafting rate of the modified nano-silica was measured by thermogravimetric analysis to be 11.8%.

[0036] The preparation method of the quaternized carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan (with an active ingredient content of 99%, purchased from Shaanxi Chenming Biotechnology Co., Ltd.) in deionized water under stirring, adding 2,3-epoxypropyltrimethylammonium chloride, raising the temperature to 70° C., reacting for 20 hours, naturally cooling to room temperature, then adding anhydrous ethanol in an equal volume to the deionized water for precipitation, centrifuging the precipitate, redissolving it in deionized water, precipitating it again with anhydrous ethanol, and drying it at 60° C. under vacuum conditions to a constant weight to obtain the quaternized carboxymethyl chitosan; wherein the mass ratio of the carboxymethyl chitosan to 2,3-epoxypropyltrimethylammonium chloride is 10:1, the mass-to-volume ratio of the carboxymethyl chitosan to deionized water is 0.8 g / mL, the centrifugal speed is 12,000 rpm, and the centrifugal time is 5 minutes; and elemental analysis test shows that the grafting rate of the quaternized carboxymethyl chitosan is 8.9%;

[0037] The modified liquid is prepared by adding polyvinyl alcohol (degree of polymerization 1650-1850, model 1788, purchased from Jinan Yuyi Chemical Co., Ltd.) to deionized water, heating to 90°C, stirring until dissolved, adding quaternized carboxymethyl chitosan, lowering the temperature to 70°C, stirring for 20 minutes, then adding modified nano-silica, ultrasonically treating for 10 minutes at an ultrasonic power of 250W, continuing to stir at 70°C for 20 minutes, naturally cooling to room temperature, filtering through a filter to remove undispersed particles, and obtaining a modified liquid. Example 3

[0038] A method for preparing a cleaning cloth made of a degradable material comprises the following steps:

[0039] Step S1: uniformly mixing cellulose pulp, an N-methylmorpholine-N-oxide aqueous solution, a modifying solution, and a fixing agent to obtain a fiber spinning solution, then adding the fiber spinning solution to a screw extruder and extruding raw yarn through a spinneret. The raw yarn is subjected to coagulation, alcohol washing, water washing, oiling, and drying processes to obtain modified lyocell fiber. The mass ratio of the cellulose pulp, the N-methylmorpholine-N-oxide aqueous solution, the modifying solution, and the fixing agent is 15:75:8:0.8, and the mass fraction of the N-methylmorpholine-N-oxide aqueous solution is 53%. The cellulose pulp is hardwood pulp with a degree of polymerization (DP) of 550 and a moisture regain of 7.2%. The fixing agent is triphenylmethane triisocyanate. The remaining steps are the same as in Example 1.

[0040] Step S2: spinning the modified lyocell fiber and the cotton fiber by compact spinning to obtain a blended yarn, and then weaving the blended yarn to obtain a cleaning towel; the rest is the same as in Example 1;

[0041] The modified solution in step S1 comprises the following raw materials in parts by weight: 10 parts of quaternized carboxymethyl chitosan, 1.5 parts of modified nano-silica, 8 parts of polyvinyl alcohol, and 120 parts of deionized water;

[0042] The preparation method of the modified nano-silica is as follows: under stirring conditions, citric acid is dispersed in anhydrous ethanol, 5,6-epoxyhexyltriethoxysilane is added, the temperature is raised to 60°C, the reaction is carried out for 8 hours, and the reaction is naturally cooled to room temperature. Then, nano-silica sol (solid content of 25%, average particle size of 86nm, pH 8.9) and deionized water are added, and after ultrasonic dispersion, the reaction is continued at 50°C for 7 hours, the reaction is naturally cooled to room temperature, and the reaction is carried out by centrifugation. The precipitate is collected and washed by centrifugation with anhydrous ethanol and deionized water in sequence. The centrifugal speed during the above centrifugation process is 10,000 rpm and the centrifugal time is 20 minutes. The reaction mixture was centrifuged and washed for 10 minutes, and then vacuum-dried at 60°C to a constant weight. After grinding, the mixture was passed through an 800-mesh sieve to obtain modified nano-silica. The mass ratio of citric acid, 5,6-epoxyhexyltriethoxysilane, nano-silica sol, and deionized water was 20:30:250:30, the volume ratio of anhydrous ethanol to deionized water was 20:15, the ultrasonic power during ultrasonic dispersion was 250 W, and the ultrasonic time was 10 minutes. The grinding process can be carried out using conventional techniques in the art. The grafting rate of the modified nano-silica was measured by thermogravimetric analysis to be 13.1%.

[0043] The preparation method of the quaternized carboxymethyl chitosan comprises the following steps: dissolving carboxymethyl chitosan (with an active ingredient content of 99%, purchased from Shaanxi Chenming Biotechnology Co., Ltd.) in deionized water under stirring, adding 2,3-epoxypropyltrimethylammonium chloride, raising the temperature to 50° C., reacting for 30 hours, naturally cooling to room temperature, then adding anhydrous ethanol in an equal volume to the deionized water for precipitation, centrifuging the precipitate, redissolving it in deionized water, precipitating it again with anhydrous ethanol, and drying it at 60° C. under vacuum conditions to a constant weight to obtain the quaternized carboxymethyl chitosan; wherein the mass ratio of the carboxymethyl chitosan to 2,3-epoxypropyltrimethylammonium chloride is 10:2, the mass-to-volume ratio of the carboxymethyl chitosan to deionized water is 1.2 g / mL, the centrifugal speed is 12,000 rpm, and the centrifugal time is 5 minutes; and elemental analysis test shows that the grafting rate of the quaternized carboxymethyl chitosan is 10.2%.

[0044] The modified liquid is prepared by adding polyvinyl alcohol (degree of polymerization 1650-1850, model 1788, purchased from Jinan Yuyi Chemical Co., Ltd.) to deionized water, heating to 70°C, stirring until dissolved, adding quaternized carboxymethyl chitosan, lowering the temperature to 50°C, stirring for 40 minutes, then adding modified nano-silica, ultrasonically treating for 20 minutes at an ultrasonic power of 250W, continuing to stir at 50°C for 40 minutes, naturally cooling to room temperature, filtering through a filter to remove undispersed particles, and obtaining a modified liquid. Comparative Example 1

[0045] A method for preparing a cleaning cloth made of a biodegradable material is prepared according to the method described in Example 1, except that the modifying liquid comprises the following raw materials in parts by weight: 8 parts of carboxymethyl chitosan, 1 part of modified nano-silica, 6 parts of polyvinyl alcohol, and 100 parts of deionized water. Comparative Example 2

[0046] A method for preparing a cleaning cloth made of a biodegradable material is prepared according to the method described in Example 1, except that the modifying liquid comprises the following raw materials in parts by weight: 8 parts of quaternized carboxymethyl chitosan, 1 part of nano-silica (commonly available on the market), 6 parts of polyvinyl alcohol, and 100 parts of deionized water. Comparative Example 3

[0047] A method for preparing a cleaning cloth made of a biodegradable material is prepared according to the method described in Example 1, except that the modifying liquid comprises the following raw materials in parts by weight: 8 parts of carboxymethyl chitosan, 1 part of nano-silicon dioxide (commonly available on the market), 6 parts of polyvinyl alcohol, and 100 parts of deionized water.

[0048] The cleaning cloths made of degradable materials prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to relevant performance tests. The water absorption rate test was carried out in accordance with GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles Part 1: Single combination test method"; the wear resistance test was carried out using a TABER wear tester with a load of 500g, a rotation speed of 60r / min, and a wear number of 13,000 times. After the test, the surface of the sample was observed to see if there were holes, fiber breakage, pilling, etc.; the antibacterial performance test was carried out in accordance with GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method"; the breaking strength test was carried out in accordance with GB / T 3923.1-2013 "Tensile Properties of Textile Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break"; Biodegradability Test: Samples were buried in ordinary soil at a depth of 25 cm under natural conditions at 25°C. From the start of the test, small amounts of water were added every 10 days to keep the soil moist. After 60 days, the samples were removed, cleaned, and dried, and the degradation rate was calculated: Degradation rate (%) = (m0 - m1) / m0 × 100%, where m0 is the initial mass of the sample and m1 is the mass of the sample after 60 days of storage. The above tests were repeated three times and the average value was taken. The test results are shown in Table 1. As shown in Table 1, the cleaning wipes prepared in Examples 1-3 not only have good water absorption properties, but also excellent wear resistance, breaking strength, and antibacterial properties, while maintaining good biodegradability. From the data of Example 1 and Comparative Examples 1-3, it can be seen that quaternized carboxymethyl chitosan and modified nano-silica are prepared by chemical modification, and cellulose pulp is modified using raw materials such as quaternized carboxymethyl chitosan, modified nano-silica, and polyvinyl alcohol to further prepare modified lyocell fiber. Finally, the modified lyocell fiber is blended with cotton fiber to prepare a cleaning towel. The wear resistance, breaking strength, and antibacterial properties of the cleaning towel are significantly improved, and although the biodegradability is slightly reduced, it still maintains a high level.

[0049] Table 1 Test results of relevant properties of cleaning cloth made of degradable materials

[0050]

[0051] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a cleaning cloth made of a degradable material, characterized in that: The following steps are involved: Step S1: uniformly mixing cellulose pulp, an N-methylmorpholine-N-oxide aqueous solution, a modifying solution, and a fixing agent to obtain a fiber spinning solution, then preparing the fiber spinning solution into a precursor, and subjecting the precursor to coagulation, alcohol washing, water washing, oiling, and drying to obtain a modified lyocell fiber; wherein the mass ratio of the cellulose pulp, the N-methylmorpholine-N-oxide aqueous solution, the modifying solution, and the fixing agent is 10-15:75:4-8:0.5-0.8; and the modifying solution is prepared by adding polyvinyl alcohol to deionized water, heating to 70-90° C., stirring until dissolved, adding quaternized carboxymethyl chitosan, lowering the temperature to 50-70° C., stirring for 20-40 minutes, then adding modified nano-silica, ultrasonically treating for 10-20 minutes, continuing to stir at 50-70° C. for 20-40 minutes, cooling, and filtering to obtain a modifying solution; The modified liquid comprises the following raw materials in parts by weight: 5-10 parts of quaternized carboxymethyl chitosan, 0.5-1.5 parts of modified nano-silica, 4-8 parts of polyvinyl alcohol, and 80-120 parts of deionized water. The modified nano-silica is prepared by: dispersing citric acid in anhydrous ethanol under stirring, adding 5,6-epoxyhexyltriethoxysilane, raising the temperature to 60-80°C, reacting for 6-8 hours, cooling to room temperature, then adding nano-silica sol and deionized water, and after ultrasonic dispersion, continuing the reaction at 50-70°C for 5-7 hours, cooling to room temperature, and post-treating to obtain the modified nano-silica. The mass ratio of citric acid, 5,6-epoxyhexyltriethoxysilane, nano-silica sol, and deionized water is 20:20-30:200-250:20-30. The cellulose pulp is hardwood pulp with a degree of polymerization (DP) of 550. Step S2: spinning the modified lyocell fiber and the cotton fiber by compact spinning to obtain a blended yarn, and then weaving the blended yarn; The preparation method of the quaternized carboxymethyl chitosan comprises: dissolving carboxymethyl chitosan in deionized water under stirring, adding 2,3-epoxypropyltrimethylammonium chloride, raising the temperature to 50-70° C., reacting for 20-30 hours, cooling to room temperature, and post-treating to obtain the quaternized carboxymethyl chitosan; the mass ratio of the carboxymethyl chitosan to the 2,3-epoxypropyltrimethylammonium chloride is 10:1-2.

2. The method for preparing a cleaning cloth made of a degradable material according to claim 1, characterized in that: During the preparation of the modified nano-silica, the volume ratio of anhydrous ethanol to deionized water is 20:5-15.

3. The method for preparing the cleaning cloth made of degradable material according to claim 1, characterized in that: During the preparation of the modified nano-silica, the ultrasonic power during ultrasonic dispersion is 150-250 W, and the ultrasonic time is 10-20 min.

4. The method for preparing a cleaning cloth made of a degradable material according to claim 1, characterized in that: The mass volume ratio of the carboxymethyl chitosan to deionized water is 0.8-1.2 g / mL.

5. A cleaning towel made of a degradable material prepared by the method according to any one of claims 1 to 4.

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