Water-softened cotton fabric and method for manufacturing the same

Abstract

The application relates to the field of functional fabrics, and particularly discloses a water-soft cotton fabric and a preparation method thereof. The water-soft cotton fabric is knitted from blended yarn, and the blended yarn is prepared from fibers in the following weight percentage: 90-95% of cotton fibers and 5-10% of spandex fibers; the cotton fibers are composed of fibers in the following weight percentage: 18-22% of long-staple cotton and 78-82% of combed cotton; the preparation method comprises the following steps: long-staple cotton soaking treatment to prepare pretreated long-staple cotton; heat setting of the pretreated long-staple cotton to obtain heat-set long-staple cotton; blending of the heat-set long-staple cotton, the combed cotton and the spandex fibers by using a siro-spinning process to obtain blended yarn; knitting of the blended yarn to obtain cotton fabric; sanding treatment; dyeing treatment; and heat setting treatment. The preparation process is simple, the water-soft cotton fabric prepared has good softness, skin-friendliness, elasticity and deformation resistance, and is suitable for long-sleeved base shirts and other close-fitting clothes with high requirements for softness, skin-friendliness and elasticity.

Description

Technical Field

[0001] This application relates to the field of functional fabrics, and more specifically, to a water-soft cotton fabric and a method for preparing the same. Background Technology

[0002] Cotton fabric has good moisture absorption, breathability, skin-friendliness, and softness, so it is widely used in clothing, bedding, and other fields. However, after repeated washing, cotton fabric is prone to hardening and shrinkage, which causes deformation and reduces its performance.

[0003] To improve the softness and elasticity of cotton fabrics, spandex and nylon fibers are often added. While the addition of spandex and nylon fibers enhances the elasticity and softness of cotton fabrics, when this type of fabric is used in close-fitting clothing, such as long-sleeved base layers, the requirements for softness, skin-friendliness, and elasticity are relatively high. Therefore, how to further improve the softness, skin-friendliness, and elasticity of such fabrics has become an urgent problem to be solved in the industry. Summary of the Invention

[0004] To address the issue that the softness, skin-friendliness, and elasticity of cotton fabrics need to be improved when used in close-fitting garments such as long-sleeved base layers, this application provides a water-soft cotton fabric and its preparation method.

[0005] In a first aspect, this application provides a water-soft cotton fabric, which adopts the following technical solution:

[0006] A water-soft cotton fabric is knitted from blended yarns, said blended yarns being made from the following fiber blends by weight percentage: 90-95% cotton fiber and 5-10% spandex fiber; said cotton fiber being composed of the following fiber blends by weight percentage: 18-22% long-staple cotton and 78-82% combed cotton.

[0007] By adopting the above technical solution, this application uses a better ratio of cotton fiber and spandex fiber to blend and prepare blended yarn, and then knits the blended yarn to make the water-soft cotton fabric of this application, which can better combine the softness and skin-friendliness of cotton fiber and the elasticity and comfort of spandex fiber.

[0008] To further enhance the softness, skin-friendliness, elasticity, and resistance to deformation of the water-soft cotton fabric, long-staple cotton and combed cotton are used as the cotton fibers. Long-staple cotton, also known as Sea Island cotton, has long, soft fibers, typically 33-39mm in length, with high strength and low twist, resulting in better softness and skin-friendliness compared to ordinary cotton fibers. Combed cotton is produced by removing shorter fibers from the cotton fibers using a combing machine, leaving longer and more uniform fibers. The fiber length is more moderate than that of long-staple cotton, typically 25-32mm. The fibers are relatively uniform in fineness, of good quality, and have a delicate feel. Therefore, this application uses a better ratio of long-staple cotton and combed cotton as cotton fibers, which can improve the softness and skin-friendliness of the resulting soft cotton fabric. Due to the long and soft fibers and low twist of long-staple cotton, the resulting soft cotton fabric has good fluffiness, thereby improving the elasticity and resistance to deformation of the soft cotton fabric. It is suitable for close-fitting clothing such as long-sleeved base layers that require high softness, skin-friendliness, and elasticity, reducing the feeling of restriction on the body and making it soft and comfortable to wear.

[0009] Preferably, the water-soft cotton fabric has a count of 50-60.

[0010] By adopting the above technical solutions, a better thread count can enable water-soft cotton fabric to have good fabric strength and elasticity while also having good lightness, softness, skin-friendliness, and comfort.

[0011] Secondly, this application provides a method for preparing water-soft cotton fabric, which adopts the following technical solution:

[0012] A method for preparing a water-soft cotton fabric includes the following preparation steps:

[0013] S1. Long-staple cotton is soaked in a treatment agent to obtain pretreated long-staple cotton.

[0014] S2. Heat-set the pretreated long-staple cotton to obtain heat-set long-staple cotton.

[0015] S3. Heat-set long-staple cotton, combed cotton and spandex fiber are blended using Sirospinning process to produce blended yarn.

[0016] S4. Knit the blended yarn to obtain cotton fabric;

[0017] S5. The cotton fabric is brushed to obtain brushed cotton fabric.

[0018] S6. Dye the brushed cotton fabric to obtain dyed cotton fabric.

[0019] S7. Heat set the dyed cotton fabric to obtain water-soft cotton fabric.

[0020] By adopting the above technical solution, long-staple cotton is first soaked in a treatment agent to make its fiber structure appear relaxed and fluffy in a three-dimensional state. Then, the long-staple cotton is heat-set to maintain its three-dimensional fiber structure. Next, the long-staple cotton, combed cotton, and spandex fibers are spun into a blended yarn using Sirospun spinning technology. The resulting blended yarn maintains its fluffy three-dimensional structure while also possessing good yarn density and strength. The resulting blended yarn exhibits good softness, comfort, abrasion resistance, and washability. The blended yarn is then knitted to produce a cotton greige fabric. This fabric is then brushed, dyed, and heat-set to produce a water-soft cotton fabric. The resulting water-soft cotton fabric has good softness, skin-friendliness, comfort, elasticity, and resistance to deformation.

[0021] Preferably, the treatment agent in step S1 is prepared from the following raw materials in parts by weight:

[0022] 5-10 parts of propylene glycol block polyether

[0023] 3-5 parts of amino silicone oil emulsion

[0024] 2-4 parts crosslinking agent

[0025] 1-2 parts of dispersant

[0026] 1-2 parts of surfactant

[0027] Citric acid 0.5-1.5 parts

[0028] 160-200 parts water.

[0029] By adopting the above technical solution, under the full wetting effect of surfactant and the stable diffusion effect of dispersant, the compounding of propylene glycol block polyether and amino silicone oil emulsion in a better ratio can improve the hydrophilicity and softness of long-staple cotton. Long-chain alkyl silane coupling agent can act as a compatibilizer between long-staple cotton and treatment agent. Crosslinking agent can penetrate and disperse evenly between the fiber structures of long-staple cotton, forming an interwoven three-dimensional structure in the fiber structure, thereby increasing the spacing between fibers, allowing long-staple cotton to fully expand and fluff, thus making long-staple cotton not only softer and more skin-friendly, but also more elastic and less prone to deformation.

[0030] Preferably, the crosslinking agent is composed of chitosan quaternary ammonium salt and pentaerythritol triallyl ether in a weight ratio of 1:(1-2).

[0031] By adopting the above technical solution, chitosan quaternary ammonium salt has amino and hydroxyl groups, which have good adsorption properties and can combine with fully impregnated long-staple cotton to form a uniform film on the surface of the long-staple cotton fiber structure. Pentaerythritol triallyl ether has multiple hydroxyl groups and multiple unsaturated vinyl groups, which can produce a good synergistic effect with chitosan quaternary ammonium salt, increase the spacing between the fiber structures of long-staple cotton, and thus improve the three-dimensionality of long-staple cotton, making long-staple cotton have better stretch and fluffiness.

[0032] Preferably, the dispersant is composed of diethylene glycol and oleylamine polyoxyethylene (2) ether in a weight ratio of 1:(0.1-0.3).

[0033] By adopting the above technical solution, diethylene glycol has soft ether segments that can produce a good synergistic effect with oleylamine polyoxyethylene (2) ether, and can be uniformly penetrated into the fiber structure of long-staple cotton to fully loosen the fiber structure of long-staple cotton and improve the processing efficiency of crosslinking agent.

[0034] Preferably, the surfactant is composed of cocamidopropyl hydroxysulfonate and isomeric alcohol polyoxyethylene ether in a weight ratio of 1:(0.5-1.5).

[0035] By adopting the above technical solution, the optimal ratio of cocamidopropyl hydroxysulfonate and isomeric alcohol polyoxyethylene ether has better penetration and wetting properties, which can effectively reduce the surface energy of long-staple cotton and improve its hydrophilicity.

[0036] Preferably, the soaking temperature in step S1 is 40-50℃, and the soaking time is 10-30 minutes.

[0037] By adopting the above technical solution, the superior soaking conditions enable long-staple cotton to be fully dispersed in the treatment solution, thus fully saturating the long-staple cotton and improving the treatment efficiency.

[0038] Preferably, the heat setting temperature in step S2 is 100-120℃, and the heat setting time is 30-60s.

[0039] By adopting the above technical solutions, the optimal heat setting temperature and heat setting rate can stably set long-staple cotton, enabling the long-staple cotton to maintain good fluffiness and stability, thereby improving the softness, skin-friendliness, elasticity and non-deformation of the resulting soft cotton fabric.

[0040] Preferably, the abrasive treatment in step S5 is mechanical abrasive, wherein the abrasive roller has a grit size of 800-1000 mesh, the roller rotates at a speed of 800-1000 r / min, the roller pressure is 0.1-0.2 MPa, and the cotton fabric travel speed is 8-10 m / min.

[0041] By adopting the above technical solutions, the superior napping conditions can create a uniform and delicate nap on the surface of the water-soft cotton fabric, further enhancing its softness and skin-friendly properties.

[0042] In summary, this application has the following beneficial effects:

[0043] 1. The water-soft cotton fabric of this application is made by blending long-staple cotton and combed cotton in a better ratio as cotton fibers, and then blending them with spandex fibers to prepare blended yarns, which are then knitted. It has good softness, skin-friendliness and comfort, as well as good elasticity and resistance to deformation. It is suitable for close-fitting clothing such as long-sleeved base layers, which require high softness, skin-friendliness and elasticity of the fabric, reducing the feeling of restriction on the human body and making it soft and comfortable to wear.

[0044] 2. By soaking long-staple cotton in a treatment agent, the fiber structure of the long-staple cotton is made into a stretched and fluffy three-dimensional state. Then, the long-staple cotton is heat-set to maintain the three-dimensional state of the fiber structure. Then, a blending process is carried out to produce water-soft cotton fabric. The resulting water-soft cotton fabric has good softness, skin-friendliness, comfort, elasticity and resistance to deformation.

[0045] 3. By soaking long-staple cotton in a treatment agent made of propylene glycol block polyether, amino silicone oil emulsion, crosslinking agent, dispersant, surfactant, citric acid and water, the fiber structure of the long-staple cotton forms an interwoven three-dimensional structure, thereby increasing the spacing between the fibers. This allows the long-staple cotton to fully expand and become fluffy, resulting in better softness and skin-friendliness, as well as better elasticity and resistance to deformation.

[0046] 4. By using chitosan quaternary ammonium salt and pentaerythritol triallyl ether as crosslinking agents, and diethylene glycol and oleylamine polyoxyethylene (2) ether as dispersants, a good synergistic effect can be achieved with propylene glycol block polyether and amino silicone oil emulsion, thereby improving the softness, skin-friendliness, elasticity and non-deformation of the prepared water-soft cotton fabric. Detailed Implementation

[0047] The present application will be further described in detail below with reference to the embodiments.

[0048] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used:

[0049] 1. Propylene glycol block polyether: Hai Petrochemical, L62;

[0050] 2. Amino silicone oil emulsion: Dow Corning MEM-8031;

[0051] 3. Chitosan Quaternary Ammonium Salt: Langbowan, Hydroxypropyltrimethylammonium Chloride Chitosan, 98% content, LBW-1025;

[0052] 4. Pentaerythritol triallyl ether: CAS No. 1471-17-6, content 75%;

[0053] 5. Oleamine polyoxyethylene (2) ether: CAS No. 13127-82-7, content 99%;

[0054] 6. Isomeric alcohol polyoxyethylene ether: Isomeric tridecyl alcohol polyoxyethylene ether 1309;

[0055] 7. Cocamidopropyl hydroxysulfonate betaine: CHSB-35, CAS No. 68139-30-0;

[0056] 8. Long-staple cotton: fiber length 38-39mm, Xinjiang long-staple cotton;

[0057] 9. Combed cotton: Fiber length 30-32mm, Xinjiang combed cotton;

[0058] 10. Spandex fiber: Produced by Toyobo Corporation, with a fineness of 1-1.5 dtex and a length of 30-35 mm.

[0059] Preparation example of treatment agent

[0060] Preparation Example 1

[0061] Preparation Example 1 discloses a treatment agent prepared by the following steps:

[0062] Add 0.05 kg of citric acid to 16 kg of water, stir to dissolve, then add 0.5 kg of propylene glycol block polyether, 0.3 kg of amino silicone oil emulsion, 0.3 kg of chitosan quaternary ammonium salt as a crosslinking agent, 0.1 kg of polyethylene glycol 400 as a dispersant, and 0.1 kg of isomeric alcohol polyoxyethylene ether as a surfactant. Stir until homogeneous to obtain the treatment agent.

[0063] Preparation Examples 2-3

[0064] The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0065] Table 1. Raw material amounts and preparation conditions for preparation examples 1-3

[0066]

[0067] Preparation Example 4

[0068] The difference between Preparation Example 4 and Preparation Example 3 is that the crosslinking agent is different. The crosslinking agent in Preparation Example 4 is composed of chitosan quaternary ammonium salt and glycidyl methacrylate, with a weight ratio of 1:1. Everything else is the same as in Preparation Example 3.

[0069] Preparation Example 5

[0070] The difference between Preparation Example 5 and Preparation Example 4 is that the crosslinking agent is composed of chitosan quaternary ammonium salt and pentaerythritol triallyl ether, with a weight ratio of 1:1. The rest is the same as Preparation Example 4.

[0071] Preparation Example 6

[0072] The difference between Preparation Example 6 and Preparation Example 4 is that the weight ratio of chitosan quaternary ammonium salt and pentaerythritol triallyl ether is 1:2, while the rest is the same as Preparation Example 5.

[0073] Preparation Example 7

[0074] The difference between Preparation Example 7 and Preparation Example 6 is that the dispersant is different. The dispersant in Preparation Example 7 is composed of polyethylene glycol 400 and oleylamine polyoxyethylene (2) ether, and the weight ratio of polyethylene glycol 400 to oleylamine polyoxyethylene (2) ether is 1:0.3. The rest is the same as Preparation Example 6.

[0075] Preparation Example 8

[0076] The difference between Preparation Example 8 and Preparation Example 7 is that the dispersant is composed of diethylene glycol and oleylamine polyoxyethylene (2) ether, and the weight ratio of diethylene glycol to oleylamine polyoxyethylene (2) ether is 1:0.1. The rest is the same as Preparation Example 7.

[0077] Preparation Example 9

[0078] The difference between Preparation Example 9 and Preparation Example 7 is that the weight ratio of diethylene glycol and oleylamine polyoxyethylene (2) ether is 1:0.3, while the rest is the same as Preparation Example 7.

[0079] Preparation Example 10

[0080] The difference between Preparation Example 10 and Preparation Example 9 is that the surfactant is different. The surfactant in Preparation Example 19 is composed of cocamidopropyl hydroxysulfonate betaine and isomeric alcohol polyoxyethylene ether, and the weight ratio of cocamidopropyl hydroxysulfonate betaine to isomeric alcohol polyoxyethylene ether is 1:0.5. Everything else is the same as in Preparation Example 9.

[0081] Preparation Example 11

[0082] The difference between Preparation Example 11 and Preparation Example 10 is that the weight ratio of cocamidopropyl hydroxysulfonate to isomeric alcohol polyoxyethylene ether is 1:1.5, while the rest is the same as Preparation Example 10.

[0083] Preparation of Comparative Example 1

[0084] The difference between Comparative Example 1 and Preparation Example 3 is that propylene glycol block polyether was replaced with an equal amount of amino silicone oil emulsion, while the rest was the same as Preparation Example 3.

[0085] Preparation of Comparative Example 2

[0086] The difference between Comparative Example 2 and Preparation Example 3 is that the amount of dispersant used is 0.1 kg and the amount of crosslinking agent used is 0.5 kg, while the rest is the same as Preparation Example 3.

[0087] Preparation of Comparative Example 3

[0088] The difference between Comparative Example 3 and Preparation Example 3 is that the amount of crosslinking agent used is 0.1 kg and the amount of amino silicone oil emulsion used is 0.8 kg, while the rest is the same as Preparation Example 3.

[0089] Example

[0090] Example 1

[0091] Example 1 discloses a water-soft cotton fabric, which is made by knitting blended yarn. The blended yarn is made from the following raw materials in weight percentage: 90% cotton fiber and 10% spandex fiber, wherein the cotton fiber is made from the following raw materials in weight percentage: 18% long-staple cotton and 82% combed cotton.

[0092] This water-soft cotton fabric is produced by the following steps:

[0093] S1. Long-staple cotton was soaked in the treatment agent prepared in Preparation Example 1 for 10 minutes at a temperature of 40°C to obtain pretreated long-staple cotton.

[0094] S2. Heat-set the pretreated long-staple cotton at a temperature of 100℃ for 60 seconds to obtain heat-set long-staple cotton.

[0095] S3. 1.62 kg of heat-set long-staple cotton, 7.38 kg of combed cotton and 1 kg of spandex fiber are blended using the Sirospun process to obtain blended yarn.

[0096] S4. Using a weft knitting circular knitting machine, the blended yarn is knitted to produce 50-count cotton fabric.

[0097] S5. The cotton fabric is brushed using a mechanical brushing machine. The brushing roller has a grit size of 800 mesh, a rotation speed of 800 r / min, a pressure of 0.1 MPa, and a cotton fabric running speed of 8 m / min to obtain brushed cotton fabric.

[0098] S6. Dye the brushed cotton fabric at a dyeing temperature of 50℃ to obtain dyed cotton fabric.

[0099] S7. Heat-set the dyed cotton fabric at a temperature of 150℃ for 5 minutes to obtain a water-soft cotton fabric. The dyeing agent is a commercially available environmentally friendly dyeing agent for fabrics, and the type is not limited. The treatment agent is a commercially available softening treatment agent with the following composition: 2% amino silicone oil emulsion, 0.5% dodecyl dimethyl benzyl ammonium chloride, and 97.5% water.

[0100] Example 2-3

[0101] The difference between Examples 2-3 and Example 1 is that the preparation process parameters are different and the source of the treatment agent is also different, as detailed in Table 2 below.

[0102] Table 2. Preparation process parameters and sources of treatment agents for Examples 1-3

[0103]

[0104]

[0105] Example 4-14

[0106] The difference between Examples 4-14 and Example 3 is that the source of the treatment agent is different, as detailed in Table 3 below.

[0107] Table 3. Source of the treatment agents in Examples 4-14

[0108]

[0109]

[0110] Example 15

[0111] The difference between Example 15 and Example 3 is that the long-staple cotton is not soaked or heat-set, but directly blended. Otherwise, it is the same as Example 3.

[0112] Example 16

[0113] The difference between Example 16 and Example 3 is that the pretreated long-staple cotton is heat-set and directly blended, while the rest is the same as Example 3.

[0114] Comparative Example

[0115] Comparative Example 1

[0116] The difference between Comparative Example 1 and Example 3 is that long-staple cotton was replaced with combed cotton in equal amounts, and combed cotton was blended with spandex fiber. Otherwise, it was the same as Example 3.

[0117] Performance testing

[0118] The following tests were conducted on the performance of the water-soft cotton fabrics prepared in Examples 1-16 and Comparative Example 1:

[0119] 1. Softness test:

[0120] According to the test method in GB / T 18318.1-2009 "Determination of Bending Properties of Textiles", the bending strength (unit: mN·cm) of the water-soft cotton fabric was tested. The lower the bending strength, the better the softness. The test results were tested and recorded.

[0121] 2. Elasticity test

[0122] The prepared water-soft cotton fabric is subjected to a tensile test using a tensile testing machine. It is stretched to the maximum deformation state, and the elastic elongation rate (unit: %) is measured. Elastic elongation rate = (stretched length - initial length) / initial length * 100%. The larger the elastic elongation rate, the greater the elasticity. The test results are detected and recorded.

[0123] 3. Resilience test:

[0124] According to the test method in FZ / T 70006-2022, the constant elongation rate was controlled at 30%, the relaxation time was 2 minutes each time, and the elastic recovery rate (unit: %) after 10 stretches under constant force was repeatedly tested and the test results were recorded.

[0125] The following are the performance test data of the water-soft cotton prepared in Examples 1-16 and Comparative Example 1, as detailed in Table 4 below.

[0126] Table 4 Performance data of the water-soft cotton fabrics prepared in Examples 1-16 and Comparative Example 1

[0127]

[0128]

[0129] Based on Examples 1-3 and Examples 4-6 and Table 4, it can be concluded that using chitosan quaternary ammonium salt and pentaerythritol triallyl ether in a better ratio as crosslinking agents can effectively improve the softness, elasticity, and resistance to deformation of the prepared water-soft cotton fabric. Compared with Example 3, the bending strength of Examples 5-6 decreased by 0.15 mN·cm, the elastic elongation increased by 1.7%, and the elastic recovery rate decreased by 1.9%. This may be because the crosslinking agent in a better ratio can effectively improve the bulkiness of long-staple cotton, thereby improving the performance of the prepared water-soft cotton fabric.

[0130] Combining Examples 6 and 7-9 with Table 4, it can be concluded that using diethylene glycol and oleic acid polyoxyethylene (2) ether in a better ratio as a dispersant can further improve the softness, elasticity and non-deformation properties of the prepared water-soft cotton fabric. Compared with Example 6, the bending strength of Examples 8-9 decreased by 0.07 mN·cm, the elastic elongation increased by 0.8%, and the elastic recovery rate decreased by 0.7%. This may be because the better ratio of dispersant can improve the penetration efficiency of the treatment agent on the long-staple cotton, thereby improving the performance of the water-soft cotton fabric.

[0131] Furthermore, combining Examples 1-3 and Examples 12-14 with Table 4, it can be concluded that the optimal ratio of propylene glycol block polyether, amino silicone oil emulsion, crosslinking agent, and dispersant has a better synergistic effect, which can better improve the performance of the prepared water-soft cotton fabric. However, in Example 12, no propylene glycol block polyether was added, in Example 13 the dispersant was reduced, and in Example 14 the crosslinking agent was reduced, resulting in a decrease in the performance of the prepared water-soft cotton fabric.

[0132] Furthermore, in conjunction with Examples 1-3 and Examples 15-16 and Table 4, it can be concluded that using the soaking followed by heat setting process of this application to treat long-staple cotton can effectively improve the softness and elasticity of the resulting soft cotton fabric and also improve its resistance to deformation.

[0133] Based on Examples 1-3 and Comparative Example 1, and in conjunction with Table 4, it can be concluded that using a better ratio of long-staple cotton and combed cotton to mix as cotton fibers to prepare water-soft cotton fabric results in a water-soft cotton fabric with better performance.

[0134] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method of making a water-softened cotton fabric, characterized by, The preparation method comprises the following steps: S1, soaking long-staple cotton with a treating agent to obtain pretreated long-staple cotton; S2, heat setting the pretreated long-staple cotton to obtain heat-set long-staple cotton; S3, blending the heat-set long-staple cotton, combed cotton and spandex fibers using a siro spinning process to obtain blended yarn; S4, knitting the blended yarn to obtain cotton fabric; S5, sanding the cotton fabric to obtain sanded cotton fabric; S6, dyeing the sanded cotton fabric to obtain dyed cotton fabric; S7, heat setting the dyed cotton fabric to obtain water-softened cotton fabric. The treating agent in the S1 step is prepared from the following raw materials by weight: propylene glycol block polyether 5-10 parts amino silicone oil emulsion 3-5 parts crosslinking agent 2-4 parts diffusion agent 1-2 parts surfactant 1-2 parts citric acid 0.5-1.5 parts water 160-200 parts; The crosslinking agent is composed of chitosan quaternary ammonium salt and pentaerythritol triallyl ether in a weight ratio of 1: (1-2); the diffusion agent is composed of diethylene glycol and oleylamine polyoxyethylene (2) ether in a weight ratio of 1: (0.1-0.3); and the surfactant is composed of cocamide propyl hydroxyl sulfobetaine and isomeric alcohol polyoxyethylene ether in a weight ratio of 1: (0.5-1.5).

2. A method of making a water-softened cotton fabric according to claim 1, characterized in that, The soaking temperature in the S1 step is 40-50℃, and the soaking time is 10-30 min.

3. A method of making a water-softened cotton fabric according to claim 1, characterized in that, The heat setting temperature in the S2 step is 100-120℃, and the heat setting time is 30-60 s.

4. A method of making a water-softened cotton fabric according to claim 1, characterized in that, The sanding in the S5 step is mechanical sanding, the sanding roller has a grit size of 800-1000 mesh, the sanding roller rotates at a speed of 800-1000 r / min, the sanding roller has a pressure of 0.1-0.2 MPa, and the cotton fabric travels at a speed of 8-10 m / min.

5. A water soft cotton fabric, characterized by, The water-softened cotton fabric is prepared by the method of any one of claims 1-4, the blended yarn is blended from the following fibers by weight percentage: 90-95% cotton fiber and 5-10% spandex fiber; and the cotton fiber is composed of the following fibers by weight percentage: 18-22% long-staple cotton and 78-82% combed cotton.

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