A soft and warm cloud cotton fabric and preparation method thereof

Abstract

The present application relates to the field of functional fabrics, and discloses a soft and warm cloud cotton fabric and a preparation method thereof. A soft and warm cloud cotton fabric is knitted from a blended yarn, and the blended yarn is blended from the following weight percentage fibers: 90-94% cotton fiber and 6-10% spandex fiber, and the cotton fiber is composed of the following weight percentage raw materials: 20-30% long-staple cotton and 70-80% combed cotton, one side of the cloud cotton fabric is a smooth surface, and the other side of the cloud cotton fabric is a sanded surface; preparation method: using cotton fiber and spandex fiber to prepare a blended yarn, using a double-ply tight siro spinning process to knit a cloud cotton grey cloth, etching, sanding, dyeing, and shaping to obtain a cloud cotton fabric. This application uses a preparation process of blending, knitting with a double-ply tight siro spinning process, etching, and sanding to obtain a cloud cotton fabric with good softness, resilience, and warmth retention. It is soft and not easy to deform when worn for a long time, and is suitable for clothing such as a base shirt.

Description

Technical Field

[0001] The present application relates to the field of functional fabrics, and more specifically, to a soft and warm cloud cotton fabric and a preparation method thereof. Background Art

[0002] Cotton fabric has good softness, skin-friendliness and warmth retention, and is widely used in underwear. However, during use, cotton fabric tends to become hard and shrink in size after repeated washing. At the same time, when underwear is worn, bulging and deformation of the arms, knee joints and other parts of the human body that need to bend are prone to occur, and it is difficult to recover after deformation, which reduces the performance of the cotton fabric.

[0003] In order to improve the softness and deformation problem of cotton fabrics, spandex fibers are usually added to cotton fabrics. Although the addition of spandex fibers will increase the elasticity of cotton fabrics and make them less likely to deform, it will reduce the warmth retention of cotton fabrics. Summary of the invention

[0004] In order to solve the problem that cotton fabrics cannot take into account softness, resilience and warmth retention at the same time, the present application provides a soft and warm cloud cotton fabric and a preparation method thereof.

[0005] In a first aspect, the present application provides a soft and warm cloud cotton fabric, which adopts the following technical solution:

[0006] A soft and warm cloud cotton fabric is knitted from blended yarn, wherein the blended yarn is blended from the following weight percentages of fibers: 90-94% cotton fiber and 6-10% spandex fiber, wherein the cotton fiber is composed of the following weight percentages of raw materials: 20-30% long-staple cotton and 70-80% combed cotton, wherein one side of the cloud cotton fabric is a brushed surface, and the other side of the cloud cotton fabric is a smooth surface.

[0007] By adopting the above technical scheme, the cotton fiber is composed of long-staple cotton and combed cotton with a better usage ratio. The long-staple cotton is also called sea island cotton. The long-staple cotton fiber is soft and long, with a length of 31-36mm, a low twist, and a soft and fluffy feel. It can reduce the yarn knots of the blended yarn, improve the flatness and wear resistance of the cloud cotton fabric, and is not easy to pilling; combed cotton is a cotton fiber that is made by removing the shorter fibers in the cotton fiber through a combing machine, leaving longer and neat cotton fibers, and the fiber length is more suitable for long-staple cotton. The length is generally 25-30mm, the fiber fineness is relatively uniform, and the hand feel is delicate; the mixed use of long-staple cotton and combed cotton can better improve the softness, skin-friendliness and warmth retention of cloud cotton fabrics; and then the cotton fiber and spandex fiber with a better usage ratio are blended to prepare blended yarn, which can better combine the properties of cotton fiber and spandex fiber. The obtained cloud cotton fabric has good softness, skin-friendliness and warmth retention, as well as good resilience, and is not easy to deform when worn and washed.

[0008] When worn as clothing, the side of the cloud cotton fabric close to the human body is a brushed surface, which makes the cloud cotton fabric have a better hairy feel and skin-fitting property, which can improve the skin-friendliness, softness and comfort of the cloud cotton when worn, and improve the warmth retention; the side of the cloud cotton fabric away from the human body is a smooth surface, which makes the cloud cotton fabric have better smoothness and flatness, and is not easy to pill when worn, thereby improving the texture and durability of the cloud cotton fabric; the cloud cotton fabric of the present application has good softness, skin-friendliness, resilience and warmth retention as a whole, is not easy to deform when worn and washed, and is suitable for autumn and winter warm clothing, such as base shirts, etc.

[0009] Preferably, the count of the blended yarn is 60-80, and the weight of the cloud cotton fabric is 160-180g / m 2 .

[0010] By adopting the above technical scheme, 60-80 blended yarns are used to produce cloud cotton fabrics with better grammage. While having better fabric strength and bursting force, it also has better lightness, fineness, softness and skin-friendliness.

[0011] In a second aspect, the present application provides a method for preparing a soft and warm cloud cotton fabric, using the following technical solution:

[0012] A method for preparing a soft and warm cloud cotton fabric comprises the following steps:

[0013] S1, blending long-staple cotton, combed cotton and spandex fiber according to a certain proportion to obtain a blended yarn;

[0014] S2, knitting the blended yarn using a double-ply tight siro spinning weaving process to obtain a cloud cotton grey cloth;

[0015] S3, using an etching agent to perform an etching treatment on the cloud cotton grey cloth;

[0016] S4, performing a sanding treatment on the inner surface of the cloud cotton grey cloth after the etched hair treatment;

[0017] S5, dyeing and shaping the brushed cloud cotton grey cloth to obtain cloud cotton fabric.

[0018] By adopting the above technical scheme, long-staple cotton, combed cotton and spandex fibers are first blended to obtain blended yarn, and then the blended yarn is knitted using a double-ply tight siro spinning weaving process, and the obtained cloud cotton grey cloth has good elasticity and support, good surface flatness, and reduced occurrence of stripes; then, an etching agent is used to perform an etching treatment, so that the flatness and smoothness of the cloud cotton grey cloth are improved, and the fluffiness, warmth retention and softness of the cloud cotton grey cloth are improved; then, the inner surface of the cloud cotton grey cloth is sanded, so that the inner surface of the cloud cotton grey cloth has uniform fluff, and the softness, skin-friendliness and warmth retention of the cloud cotton fabric are improved; finally, dyeing and shaping are performed to improve the dimensional stability of the cloud cotton fabric; the preparation method of the present application is simple and the operation steps are simple, and the softness, skin-friendliness and warmth retention of the cloud cotton fabric are improved by the process of first etching and then sanding.

[0019] Preferably, in step S3, a hair-etching agent is used for immersion treatment, and the hair-etching agent is made of the following raw materials in weight percentage:

[0020]

[0021] Water balance.

[0022] By adopting the above technical scheme, cellulase and papain with a better dosage ratio are compounded. Papain is a thiol protease with good activity and stability, and can produce a good synergistic effect with cellulase. The cloud cotton fabric is uniformly enzymolyzed, and the fine hair and hair knots on the surface of the cloud cotton fabric can be effectively removed, making the surface of the cloud cotton fabric smoother. The treated cloud cotton fabric is not easy to pilling, and the durability is improved; the stabilizer can improve the enzymolysis uniformity and enzymolysis efficiency of cellulase and papain, reduce the situation where the strength of the cloud cotton fabric is reduced due to excessive enzymolysis, and improve the softness and fluffiness of the cloud cotton fabric, thereby improving the resilience and warmth retention; At the same time, the stability of cellulase and papain is improved, so that cellulase and papain have better activity; the impregnating agent can produce a good synergistic effect with the stabilizer, while improving the uniformity of enzymatic hydrolysis of cellulase and papain, it can penetrate into the gaps in the fiber structure, and have a better uniform fluffy and stretching effect on the fiber structure of the cloud cotton fabric, thereby improving the softness, skin-friendliness, resilience and warmth retention of the cloud cotton fabric; the dispersant can improve the wetting uniformity of the impregnating agent, and at the same time make the fine hair and hair knots on the surface of the cloud cotton grey cloth evenly wetted, thereby improving the uniformity of the hair etching treatment; the buffer solution plays a role in maintaining the acid-base balance of the system, thereby improving the stability of the hair etching treatment.

[0023] Preferably, the stabilizer is composed of tallow amine polyoxyethylene ether, propylene glycol alginate and cocoglyceryl in a weight ratio of 1:(1-3):(0.5-1).

[0024] By adopting the above technical scheme, tallow amine polyoxyethylene ether, propylene glycol alginate and coconut oil glyceryl ester are used as stabilizers in an optimal dosage ratio. Tallow amine polyoxyethylene ether and propylene glycol alginate can improve the dispersion uniformity and adsorption of the hair-etching agent on the surface of the cloud cotton fabric, and coconut oil glyceryl ester can improve the adhesion stability of tallow amine polyoxyethylene ether and propylene glycol alginate. The three produce a good synergistic effect, which improves the uniform dispersion of cellulase and papain on the surface of the cloud cotton fabric, and uniformly enzymolyzes the cloud cotton fabric to remove fine hair and hair knots, thereby improving the surface smoothness and softness of the cloud cotton fabric and preventing pilling.

[0025] Preferably, the wetting agent is composed of sulfonate polyether polyol and amino silicone oil emulsion in a weight ratio of 1:(1-3).

[0026] By adopting the above technical scheme, sulfonate polyether polyol and amino silicone oil emulsion with a better dosage ratio are used as wetting agents. The two produce a good synergistic effect and can penetrate into the fiber structure of the cloud cotton fabric. Under the enzymatic hydrolysis of cellulase and papain, they are infiltrated and adsorbed in the gaps of the fiber structure, which has a better uniform fluffy and stretching effect on the fiber structure of the cloud cotton fabric, thereby improving the softness, skin-friendliness, resilience and warmth retention of the cloud cotton fabric.

[0027] Preferably, the dispersant is sodium polyacrylate 445N and / or sodium polyaspartate.

[0028] By adopting the above technical solution, the above dispersant has good dispersibility, can enhance the synergistic effect of the wetting agent and the stabilizer on cellulase and papain, and further improve the uniformity and stability of the etching treatment.

[0029] Preferably, the buffer solution is any one of acetic acid-sodium acetate buffer solution and citric acid-sodium citrate buffer solution.

[0030] By adopting the above technical solution, the above buffer solution has good buffer stability, provides a moderate acid-base environment for enzymatic hydrolysis, and improves the uniformity of etching treatment.

[0031] Preferably, the water bath ratio of the etching treatment is 1:(10-12), the etching treatment temperature is 50-60°C, and the etching treatment time is 30-60min.

[0032] By adopting the above technical scheme, the better etching treatment conditions can make the surface of the cloud cotton fabric evenly etched, thereby improving the softness and smoothness of the surface of the cloud cotton fabric without over-etching and affecting the strength of the cloud cotton fabric.

[0033] Preferably, in the sanding treatment, sanding sand is used for physical sanding, and the mesh number of the sanding sand is 600-800 meshes.

[0034] By adopting the above technical solution, the better roughness of the sanding sand can make the inner surface of the cloud cotton fabric have uniform and delicate fluff, improve the uniformity of sanding, and then improve the softness, skin-friendliness and warmth retention of the cloud cotton fabric.

[0035] In summary, this application has the following beneficial effects:

[0036] 1. The soft and warm cloud cotton fabric of the present application is made by using long-staple cotton and combed cotton as cotton fibers, blending and knitting with spandex fibers. When worn, the side of the cloud cotton fabric away from the human body is a smooth surface, which has good smoothness and flatness, and is not easy to pill when worn; the side of the cloud cotton fabric close to the human body is a brushed surface, which has good wool feeling and skin-friendly property; the performance of cotton fiber and spandex fiber can be well combined, and the prepared cloud cotton fabric has good softness, skin-friendliness and warmth retention, as well as good resilience, is not easy to deform when worn and washed, and is suitable for autumn and winter warm clothing, such as base shirts, etc.

[0037] 2. The preparation method of the soft and warm cloud cotton fabric of the present application is to first use an etching agent to etch the cloud cotton grey cloth, so that the flatness and smoothness of the cloud cotton grey cloth are improved, and at the same time, the fluffiness of the cloud cotton grey cloth is improved, thereby improving the softness and warmth retention; then the inner surface of the cloud cotton grey cloth is sanded so that the inner surface of the cloud cotton grey cloth has uniform fluff, and finally dyeing and shaping are performed, and the obtained cloud cotton fabric has good softness, skin-friendliness and warmth retention.

[0038] 3. The cloud cotton grey fabric is treated with an etching agent made of cellulase, papain, a stabilizer composed of tallow amine polyoxyethylene ether, propylene glycol alginate and coconut oil glyceride, a wetting agent composed of sulfonate polyether polyol and amino silicone oil emulsion, a dispersant, a buffer solution and water to improve the softness, elasticity and warmth retention of the cloud cotton fabric. DETAILED DESCRIPTION

[0039] The present application is further described in detail below with reference to the embodiments.

[0040] The following are the sources and specifications of some raw materials of this application. The raw materials used in the preparation examples and embodiments of this application can be obtained from the market, including but not limited to the raw materials of the following models and manufacturers. Raw materials with equivalent performance can be used:

[0041] 1. Cellulase: Cellusoft Neupolish 8000L;

[0042] 2. Papain: Pangbo brand, content 99%, enzyme activity 100,000;

[0043] 3. Tallow amine polyoxyethylene ether: brand sea stone flower, TA-8;

[0044] 4. Propylene glycol alginate: brand Mingyue, content 99%, CAS number 9005-37-2;

[0045] 5. Coconut oil glyceryl ester: BASF PEG-7;

[0046] 6. Sulfonate polyether polyol: Jinan Huakai HKP-6033, molecular weight 500-600, hydroxyl value 190-210;

[0047] 7. Amino silicone oil emulsion: Green Union CM8194, content 90%;

[0048] 8. Sodium polyaspartate: content 40%, CAS number 181828-06-8;

[0049] 9. Hydroxyethyl cellulose: Dow QP-300H;

[0050] 10. Long-staple cotton: Xinjiang long-staple cotton, fiber length 31-36mm;

[0051] 11. Combed cotton: Xinjiang combed cotton, fiber length 25-30mm;

[0052] 12. Spandex fiber: 20-30D, length 28-35mm.

[0053] Preparation example of hair-etching agent

[0054] Preparation Example 1

[0055] Preparation Example 1 discloses a hair-etching agent, which is prepared by the following steps:

[0056] Add 0.2kg 1mol / L acetic acid-sodium acetate buffer solution with pH=5 into 8.3kg water, stir well, then add 0.5kg stabilizer (composed of hydroxyethyl cellulose and tallow amine polyoxyethylene ether in a weight ratio of 1:1), 0.4kg amino silicone oil emulsion as a wetting agent and 0.1kg sodium polyacrylate 445N as a dispersant, stir to dissolve, then add 0.3kg cellulase and 0.2kg papain, stir well to prepare a hair etching agent.

[0057] Preparation Example 2-3

[0058] The difference between Preparation Example 2-3 and Preparation Example 1 is that the amounts of raw materials used are different, see Table 1 below for details.

[0059] Table 1 Raw material dosage table of preparation examples 1-3

[0060]

[0061]

[0062] Preparation Example 4

[0063] The difference between Preparation Example 4 and Preparation Example 1 is that the stabilizer is different. The stabilizer in Preparation Example 4 is composed of isomeric alcohol polyoxyethylene ether 1308, propylene glycol alginate and glycerol. The amount of tallow amine polyoxyethylene ether is 0.1 kg, the amount of propylene glycol alginate is 0.2 kg, and the amount of glycerol is 0.2 kg. The rest is the same as Preparation Example 1.

[0064] Preparation Example 5

[0065] The difference between Preparation Example 5 and Preparation Example 4 is that the stabilizer consists of tallow amine polyoxyethylene ether, propylene glycol alginate and cocoyl glyceride, the amount of tallow amine polyoxyethylene ether is 0.2 kg, the amount of propylene glycol alginate is 0.2 kg, the amount of cocoyl glyceride is 0.1 kg, and the rest is the same as Preparation Example 4.

[0066] Preparation Example 6

[0067] The difference between Preparation Example 6 and Preparation Example 5 is that the amount of tallow amine polyoxyethylene ether used is 0.1 kg, the amount of propylene glycol alginate used is 0.3 kg, and the amount of cocoglyceryl ester used is 0.1 kg. The rest is the same as Preparation Example 5.

[0068] Preparation Example 7

[0069] The difference between Preparation Example 7 and Preparation Example 5 is that the wetting agent is different. The wetting agent in Preparation Example 7 is composed of sulfonate polyether polyol and amino silicone oil emulsion. The amount of sulfonate polyether polyol used is 0.2 kg, and the amount of amino silicone oil emulsion used is 0.2 kg. The rest is the same as Preparation Example 5.

[0070] Preparation Example 8

[0071] The difference between Preparation Example 8 and Preparation Example 7 is that the amount of sulfonate polyether polyol used is 0.1 kg, the amount of amino silicone oil emulsion used is 0.3 kg, and the rest is the same as Preparation Example 7.

[0072] Preparation Comparative Example 1

[0073] The difference between Preparation Comparative Example 1 and Preparation Example 1 is that an equal amount of papain is replaced by cellulase, and the rest is the same as Preparation Example 1.

[0074] Example

[0075] Example 1

[0076] Example 1 discloses a soft and warm cloud cotton fabric, which is knitted from blended yarn, wherein the blended yarn is blended from 92% cotton fiber and 8% spandex fiber, wherein the cotton fiber is composed of 30% long-staple cotton and 70% combed cotton, and the side of the cloud cotton fabric close to the human body is a brushed surface, and the side of the cloud cotton fabric away from the human body is a smooth surface.

[0077] The soft and warm cloud cotton fabric is prepared by the following preparation method:

[0078] S1, 2.76kg of long-staple cotton, 6.44kg of combed cotton and 0.8kg of spandex fiber are blended according to a certain ratio to obtain a 60-count blended yarn;

[0079] S2, knit the blended yarn using a double-ply tight siro spinning process to obtain 180g / m 2 Cloud cotton fabric;

[0080] S3, using a commercially available etching agent to etch the cloud cotton grey cloth, controlling the water bath ratio to be 1:10, that is, mixing the commercially available etching agent and water in a weight ratio of 1:10, and soaking at a temperature of 60° C. for 30 minutes;

[0081] S4. The inner surface of the cloud cotton grey cloth after the etched hair treatment is subjected to a sanding treatment using a sanding machine, the mesh number of the sanding sand of the sanding roller for the sanding treatment is 600 meshes, the rotation speed of the sanding roller is 300 r / min, the pressure of the sanding roller is 0.1 MPa, and the sanding time is 20 s;

[0082] S5, dyeing the sanded cloud cotton grey fabric, and hot-air setting it at a temperature of 170° C. to obtain a cloud cotton fabric;

[0083] The commercially available hair-etching agent is composed of 6% cellulase and 2% 1 mol / L acetic acid-sodium acetate buffer solution with pH=4.5; the dyeing uses a commercially available environmentally friendly dye, and the dyeing and setting treatments are conventional processing steps in the field and will not be described in detail here.

[0084] Embodiment 2-4

[0085] The difference between Example 2-4 and Example 1 is that the preparation process parameters are different and the source of the etching agent is also different, see Table 2 below for details.

[0086] Table 2 Preparation process parameters and sources of etching agents for Examples 1-4

[0087]

[0088]

[0089] Embodiment 5-10

[0090] The difference between Examples 5-10 and Example 2 is that the hair-etching agents are different, as shown in Table 3 below.

[0091] Table 3 Sources of the hair-etching agents of Examples 5-10

[0092] Example Source of Etching Agent Example 5 Preparation Example 4 Example 6 Preparation Example 5 Example 7 Preparation Example 6 Example 8 Preparation Example 7 Example 9 Preparation Example 8 Example 10 Preparation Comparative Example 1

[0093] Comparative Example

[0094] Comparative Example 1

[0095] The difference between Comparative Example 1 and Example 1 is that an equal amount of long-staple cotton is replaced by combed cotton, and the rest is the same as Example 1.

[0096] Performance Testing The following performance tests were conducted on the soft and warm cloud cotton fabrics of Examples 1-10 and Comparative Example 1:

[0097] 1. Softness test

[0098] According to the test method in GB / T 18318.1-2009 "Determination of Flexural Properties of Textiles", the bending stiffness (unit: mN cm) of the cloud cotton fabric was tested and recorded as the first bending strength. The smaller the bending stiffness, the better the softness of the cloud cotton fabric. The test results were tested and recorded.

[0099] 2. Use a drum washing machine, adjust it to the quick wash mode, use a commercial laundry detergent that accounts for 1% of the washing volume, wash the cloud cotton fabric 25 times, and then test the bending stiffness (unit: mN·cm) of the cloud cotton fabric according to the test method in GB / T 18318.1-2009 "Determination of Flexural Properties of Textiles", record it as the second bending strength, and test and record the test results; 3. Rebound test

[0100] According to the test method in FZ / T 70006-2022, the elongation is controlled to be 50%, the relaxation time is 2 minutes each time, and the elastic recovery rate (unit: %) after 10 stretches is repeatedly tested, and the test results are recorded;

[0101] 4. Warmth test

[0102] Test according to method A in GB / T 11048-1989, test the thermal insulation rate (unit: %), test and record the test results;

[0103] 5. Smooth surface wear resistance test

[0104] Use a textile pilling tester, set the speed to 100r / min, and test the pilling level of the smooth surface of the cloud cotton fabric after 500 revolutions. The pilling levels are as follows: no pilling is recorded as level 5, slight pilling is recorded as level 4, medium pilling is recorded as level 3, more pilling is recorded as level 2, and severe pilling is recorded as level 1. Test and record the test results;

[0105] The following are the performance test data of the soft and warm cloud cotton fabrics prepared in Examples 1-10 and Comparative Example 1, see Table 4 below for details.

[0106] Table 4 Data table of soft and warm cloud cotton fabrics of Examples 1-10 and Comparative Example 1

[0107]

[0108]

[0109] Combining Example 1 and Comparative Example 1 and Table 4, it can be seen that the cloud cotton fabric obtained by using the long-staple cotton and combed cotton in the preferred dosage ratio of the present application as cotton fibers has good softness, resilience and warmth retention, and can still maintain good softness after washing; while in Comparative Example 1, the long-staple cotton is replaced with combed cotton. Compared with Example 1, the bending strength of the cloud cotton obtained is increased by 0.36 mN·cm, the elastic recovery rate is reduced by 1.8%, and the thermal insulation rate is reduced by 1.9%. The softness after washing is also significantly reduced compared with Example 1, and the fuzzing level is also reduced. This may be because the surface smoothness, softness and fluffiness of the cloud cotton fabric are reduced in the absence of long-staple cotton.

[0110] Combining Example 1 with Example 2-3 and Example 4-7 and Table 4, it can be seen that, compared with Example 1, Example 2-4 uses the hair-etching agent of the present application to etch the cloud cotton grey cloth, which can better improve the surface flatness and smoothness of the side of the cloud cotton fabric away from the human body, and can also better improve the softness, resilience and heat preservation of the cloud cotton fabric; and compared with Example 2 and Example 5, the bending strength of the cloud cotton fabric in Example 6-7 is reduced by 0.1mN·cm, the elastic recovery rate is increased by 0.8%, the heat preservation rate is increased by 0.8%, and the The change rate of bending strength after washing is also small, indicating that it is not easy to deform after washing and can maintain good softness. The fuzzing level of the smooth surface is also improved from level 4 to level 5. It can be seen that the better dosage ratio of tallow amine polyoxyethylene ether, propylene glycol alginate and coconut acid glyceride as stabilizers has a good synergistic effect, which can improve the enzymatic hydrolysis uniformity and efficiency of cellulase and papain, reduce the situation where the strength of the cloud cotton fabric is reduced due to excessive enzymatic hydrolysis, improve the flatness, softness and fluffiness of the cloud cotton fabric, and make it less prone to fuzzing, thereby improving the resilience and thermal insulation.

[0111] Furthermore, compared with Example 6, Examples 8-9 use sulfonate polyether polyol and amino silicone oil emulsion in a better dosage ratio as wetting agents, which can further produce a better synergistic effect with the stabilizer to improve the softness, resilience and warmth retention of the prepared cloud cotton fabric.

[0112] Furthermore, in Example 1, compared with Example 10, papain replaced cellulase, and the fuzzing grade of the obtained cloud cotton fabric was reduced from level 4 to level 3, and other properties were also slightly reduced. This may be because the synergistic effect of papain was lost, which reduced the enzymatic stability and enzymatic efficiency of the cloud cotton fabric.

[0113] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A method for preparing a soft and warm cloud cotton fabric, characterized in that: The following steps are involved: S1, blending long-staple cotton, combed cotton and spandex fiber according to a certain proportion to obtain a blended yarn; S2, knitting the blended yarn obtained by double-ply compact siro spinning to obtain cloud cotton grey cloth; S3, using an etching agent to perform an etching treatment on the cloud cotton grey cloth; S4, performing a sanding treatment on the inner surface of the cloud cotton grey cloth after the etched hair treatment; S5, dyeing and shaping the cloud cotton grey cloth after the brushing treatment to obtain the cloud cotton fabric; The blended yarn is made by blending the following weight percentages of fibers: 90-94% cotton fiber and 6-10% spandex fiber, the cotton fiber is composed of the following weight percentages of raw materials: 20-30% long-staple cotton and 70-80% combed cotton, one side of the cloud cotton fabric is a brushed surface, and the other side of the cloud cotton fabric is a smooth surface; In the step S3, a hair-etching agent is used for soaking treatment, and the hair-etching agent is prepared from the following raw materials in percentage by weight: Cellulase 2-4% Papain 1-2% Stabilizer 3-8% Wetting agent 4-6% Dispersant 1-2% 1mol / L pH=5-6 buffer solution 2-3% Water balance; The stabilizer is composed of tallow amine polyoxyethylene ether, propylene glycol alginate and coconut oil glyceride in a weight ratio of 1: (1-3): (0.5-1); The wetting agent is composed of sulfonate polyether polyol and amino silicone oil emulsion in a weight ratio of 1:(1-3); The water bath ratio of the etching treatment is 1: (10-12), the etching treatment temperature is 50-60°C, and the etching treatment time is 30-60min.

2. The method for preparing a soft and warm cloud cotton fabric according to claim 1, characterized in that: The count of the blended yarn is 60-80, and the weight of the cloud cotton fabric is 160-180g / m 2 .

3. The method for preparing a soft and warm cloud cotton fabric according to claim 1, characterized in that: The dispersant is sodium polyacrylate 445N and / or sodium polyaspartate.

4. The method for preparing a soft and warm cloud cotton fabric according to claim 1, characterized in that: The buffer solution is any one of an acetic acid-sodium acetate buffer solution and a citric acid-sodium citrate buffer solution.

5. The method for preparing a soft and warm cloud cotton fabric according to claim 1, characterized in that: In the sanding treatment, sanding sand is used for physical sanding, and the mesh number of the sanding sand is 600-800 meshes.

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