Imitated copper ammonia island air layer fabric and production method thereof

Abstract

The invention relates to the technical field of textile after-finishing, and discloses a copper ammonia imitating sea-island air layer fabric and a production method thereof.The fabric is composed of cotton fibers and polyester fibers, and epoxy propyl quaternary ammonium salt modified chitosan is covalently bonded to the surfaces of the cotton fibers. The production method comprises the following steps: S1, providing a raw material fabric formed by interweaving the cotton and the sea-island polyester fibers; s2, performing trace cationization pretreatment on the fabric to form a protective layer; s3, decoupling, splitting and hydrolyzing the sea island components by using a composite biological enzyme at low temperature; s4, forming a temporary shielding layer on the surface of the polyester fiber by using a functional polymer; and S5, performing main cationization and anionic dye dyeing in the same bath to realize selective dyeing of the cotton. A low-temperature biological enzyme process is adopted to replace a traditional high-temperature strong alkali method, damage to cotton fibers is avoided, and the breaking strength and softness of the fabric are improved; meanwhile, the process is low in energy consumption and small in pollution; through serialized selective treatment, the frosted appearance effect with high contrast ratio and excellent color fastness is finally obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile finishing, in particular to a copper-imitated sea-island air-layer fabric and a production method thereof. BACKGROUND

[0002] The compounding of natural fibers with synthetic fibers is an important way to develop new functional and comfortable textiles. Among them, the compounding of cotton and ultra-fine denier polyester fibers is favored because it combines the skin-friendly and moisture-absorbing properties of cotton with the crispness and easy-care advantages of polyester fibers. Sea-island composite fibers are the main technical means for preparing ultra-fine denier polyester fibers. By removing the "sea" component polymer, the ultra-fine fibers wrapped therein are exposed. This process is commonly known as fiber opening or decoupling.

[0003] In the production of cotton / sea-island polyester fiber interwoven or blended fabrics, the current mainstream fiber opening process in the industry is the high-temperature strong alkali method. This method usually uses a high concentration of sodium hydroxide solution to treat the fabric at a near-boiling temperature for a long time to hydrolyze and dissolve the "sea" component in the sea-island fiber.

[0004] However, this traditional fiber opening process has inherent and difficult-to-overcome technical defects when applied to composite fabrics containing cotton components. The strong alkali and high temperature treatment conditions can cause irreversible damage to cotton fibers, which are sensitive to chemical properties. The cellulose macromolecular chain will undergo significant degradation under strong alkaline and high temperature conditions, resulting in a significant decrease in the physical strength of the cotton fiber, and the final strength of the fabric does not meet the standards. At the same time, this damage also destroys the original soft touch of the cotton fiber, making the finished fabric stiff and hard, and losing the comfort experience that cotton fiber should have.

[0005] In addition, the process itself is also contrary to the requirements of modern textile industry for green and sustainable development. Maintaining a high-temperature treatment environment for a long time requires a large amount of heat energy, resulting in high production energy consumption. At the same time, this process produces a large amount of alkaline wastewater with high pH value and high chemical oxygen demand (COD), which puts a huge pressure and cost burden on the subsequent wastewater treatment system and does not meet the requirements of environmental protection. SUMMARY

[0006] The technical problem to be solved by the present application is that the existing fiber opening process for sea-island fiber fabrics mainly uses the high-temperature strong alkali method, which has the defects of high energy consumption, serious environmental pollution, and easy damage to cotton fibers, resulting in a stiff and strong fabric.

[0007] To solve the above technical problems, the present application provides a new type of copper-imitated sea-island air-layer fabric and a green and efficient production method thereof.

[0008] The first aspect of the present application provides a copper ammonia island-in-the-air fabric.

[0009] The fabric is composed of cotton fibers and polyester fibers. In terms of weight percentage, the fabric contains 35-55% cotton fibers and 45-65% polyester fibers. Its structural feature is that the surface of the cotton fibers is covalently bonded with epoxy propyl quaternary ammonium salt modified chitosan, and the amount of the epoxy propyl quaternary ammonium salt modified chitosan is 2.0% to 4.0% of the total weight of the fabric.

[0010] In a preferred embodiment, the cotton fibers of the fabric are derived from 42 cotton yarns, and the polyester fibers are derived from 105D island-in-the-air polyester filament fibrillation formed ultrafine fibers and 75D ordinary polyester filaments as connecting yarns.

[0011] The second aspect of the present application provides a method for producing the copper ammonia island-in-the-air fabric.

[0012] The method realizes the fibrillation of island-in-the-air fibers and the differential finishing of the fabric under mild conditions through sequential and selective chemical and biological treatment of different fiber components, and specifically includes the following steps:

[0013] S1, providing a raw fabric;

[0014] This step provides a raw fabric made of cotton fibers and island-in-the-air polyester fibers through an interweaving process.

[0015] S2, trace cationization pretreatment;

[0016] This step performs trace cationization pretreatment on the raw fabric. Its technical mechanism is to pre-graft a protective layer with positive charges on the surface of the cotton fibers, and to generate electrostatic action on the charged biological enzyme molecules in the subsequent enzyme treatment step, thereby reducing the direct contact between the enzyme and the cotton fibers and achieving protection of the cotton fiber component.

[0017] In a preferred embodiment, the cationic agent used in this step is epoxy propyl quaternary ammonium salt modified chitosan, and the amount is 0.3% to 0.8% of the weight of the fabric.

[0018] S3, complex biological enzyme decoupling fibrillation;

[0019] The fabric treated in S2 is treated with a complex biological enzyme preparation under low temperature conditions. This step utilizes the high specificity of polyester hydrolase for the hydrolyzable "sea" component in the island-in-the-air polyester fibers to hydrolyze it into water-soluble small molecules, thereby releasing the ultrafine polyester fibers of the "island" component to form the polyester fibers required for the final product. The entire process is carried out in a low temperature environment, avoiding damage to the fibers caused by high temperature.

[0020] In a preferred embodiment, the complex bio-enzyme preparation comprises a genetically recombined polyester hydrolytic enzyme and a lipase or cutinase.

[0021] In another preferred embodiment, the process conditions of this step are: temperature controlled at 50-60°C, pH value controlled at 7.5-8.5.

[0022] S4, temporary shielding layer construction; the fabric treated in S3 is treated with a soluble functional polymer. The technical mechanism is that a physical temporary shielding layer is formed on the surface of the newly exposed polyester fiber after the fiber opening treatment, which is used to hinder the adsorption of cationic agent and dye molecules on the surface of polyester fiber in the subsequent main cationization and dyeing steps.

[0023] In a preferred embodiment, the soluble functional polymer is sodium carboxymethyl cellulose or sodium alginate.

[0024] S5, main cationization and selective dyeing; the fabric treated in S4 is treated with main cationization and dyeing in the same bath. In this step, due to the presence of the temporary shielding layer on the surface of the polyester fiber, the cationic agent used for main cationization mainly reacts with the unshielded cotton fiber, making its surface loaded with a large number of positive charges. The anionic dye added subsequently is adsorbed on the cationized cotton fiber at a high speed and high selectivity due to strong electrostatic attraction, while it has little dyeing on the polyester fiber, thereby forming a clear and high-contrast two-color appearance on the fabric. This step finally produces the imitation copper ammonia island-in-the-air fabric.

[0025] In a preferred embodiment, the main cationization treatment agent used in this step is epoxy propyl quaternary ammonium salt modified chitosan.

[0026] In another preferred embodiment, the specific operation process of this step includes:

[0027] First, epoxy propyl quaternary ammonium salt modified chitosan and anionic dye used for main cationization treatment are added to the bath in which the fabric treated in S4 is located;

[0028] Second, the pH value of the dyeing bath is adjusted to 5.5-6.5;

[0029] Finally, the temperature is raised to 60-85°C at a rate of 1.0-1.5°C / min, and the temperature is maintained for 40-60 minutes.

[0030] In a preferred embodiment, after step S5, the method further includes a step of slightly sanding the fabric. This step uses a high-density carbon fiber or ceramic fiber brush roller to treat the surface of the fabric to improve the pile feeling and softness of the fabric.

[0031] In summary, the present invention has at least one of the following beneficial technical effects:

[0032] 1. This invention uses a low-temperature composite bio-enzyme preparation to decouple and open island-type polyester fibers, and pre-protects cotton fibers with trace amounts of cationization beforehand, completely replacing the traditional high-temperature strong alkali treatment process. This technical solution avoids damage to the natural structure of cotton fibers caused by strong alkali and high temperature, and preserves the original strength, luster and softness of cotton fibers to the maximum extent, so that the final fabric has a better soft hand feel and drape performance.

[0033] 2. The core steps, including bio-enzyme decoupling and fiber opening and cationization dyeing, are all carried out at temperatures far lower than those of traditional processes. This low-temperature production path significantly reduces energy consumption throughout the entire production process. At the same time, by avoiding the use of highly polluting chemicals such as strong alkalis, it also reduces the load on subsequent wastewater treatment from the source, and has clear advantages in energy conservation, emission reduction and environmental protection.

[0034] 3. By constructing a temporary physical shielding layer on the surface of polyester fibers and then performing a sequential process of main cationization treatment on cotton fibers, a highly selective dyeing mechanism was established. This mechanism ensures that anionic dyes are precisely guided to cotton fibers for adsorption and fixation, while polyester fibers remain nearly white. This allows for the stable and repeatable production of products with a high-contrast frosted appearance. Furthermore, due to the cationization dyeing principle, the product exhibits excellent color fastness indicators. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to preparation examples, embodiments, comparative examples and test examples.

[0036] The main raw materials and reagents used in the following examples and comparative examples have the following sources and specifications. Reagents not specifically mentioned are all commercially available analytical grade or higher grade products.

[0037] Raw material fabric: An air-layer knitted fabric woven from three types of yarns, specifically composed of:

[0038] Surface yarn: 42-count combed cotton yarn.

[0039] Bottom yarn: 105D / 36f island-type polyester filament, wherein the "sea" component is alkali-soluble copolyester (Co-PET) and the "island" component is polyethylene terephthalate (PET).

[0040] Connecting yarn: 75D ordinary polyester filament, made of polyethylene terephthalate (PET).

[0041] Chitosan: CAS No.: 9012-76-4;

[0042] Glycidyltrimethylammonium chloride: CAS No.: 3033-77-0;

[0043] Lipase: CAS No.: 9001-62-1;

[0044] Sodium alginate: CAS No.: 9005-38-3;

[0045] Active Black 5: CAS No.: 17095-24-8;

[0046] Sodium hydroxide: CAS No.: 1310-73-2;

[0047] Acetic acid: CAS No.: 64-19-7;

[0048] Sodium carbonate: CAS No.: 497-19-8;

[0049] Isopropyl alcohol: CAS No.: 67-63-0.

[0050] The preparation examples of this invention provide the source or preparation method of the key raw materials glycidyl quaternary ammonium salt modified chitosan and recombinant polyester hydrolase, to ensure that those skilled in the art can realize this invention.

[0051] Preparation Example 1: Preparation of Chitosan Modified with Glyceryl Oxide Quaternary Ammonium Salt

[0052] This preparation example provides a method for preparing glycidyl quaternary ammonium salt modified chitosan for steps S2 and S5 of the present invention. The specific steps are as follows:

[0053] Weigh 10 parts of chitosan powder with a molecular weight of 250,000 and a degree of deacetylation of 90%, add it to a reactor containing 100 parts of 2% (by weight) acetic acid aqueous solution, and mechanically stir at room temperature for 4 hours until the chitosan is completely dissolved to form a homogeneous and transparent chitosan solution.

[0054] Take another reaction vessel, add 15 parts isopropanol and 5 parts deionized water, turn on the stirrer and heat to 60°C. Transfer the chitosan solution obtained in step (1) to a constant pressure dropping funnel, and slowly and uniformly add it to the isopropanol aqueous solution over 30 minutes. After the addition is complete, continue stirring at this temperature for 1 hour.

[0055] Weigh 15 parts of glycidyltrimethylammonium chloride (industrial grade, content ≥90%) and prepare a 50% (weight percentage) aqueous solution. Add the solution to a constant pressure dropping funnel and add it dropwise over 2 hours to the reaction system in step (2).

[0056] After the addition is complete, the temperature of the reaction system is raised to 65°C, and the reaction continues at this temperature for 5 hours.

[0057] After the reaction is complete, stop heating and allow it to cool naturally to room temperature. Slowly add isopropanol to the reaction mixture to induce precipitation until no obvious precipitate forms. After standing and separating the layers, collect the solid product by vacuum filtration.

[0058] The collected solid product was washed with 80% (volume fraction) ethanol solution, stirring for 30 minutes after each wash and then filtering. This washing operation was repeated 3 times. The filtrate after the last wash was tested with 0.1 mol / L silver nitrate solution to confirm the absence of chloride ions.

[0059] The washed solid product was placed in a vacuum drying oven at 60°C and dried for 10 hours. After being removed, it was crushed and passed through a 100-mesh sieve to obtain white powdered glycidyl quaternary ammonium salt modified chitosan, which was then sealed and stored for later use.

[0060] Preparation Example 2: Obtaining Recombinant Polyester Hydrolase

[0061] The recombinant polyester hydrolase used in step S3 of this embodiment is a commercially available enzyme preparation with polyester (PET) hydrolytic activity. Those skilled in the art can obtain such products from the market; for example, they can purchase LCC-type polyester hydrolases (such as keratinase mutants derived from *Tricholoma thermophilum*) disclosed in the literature from Novozymes A / S (Denmark), or enzyme preparations with equivalent or higher polyester hydrolytic activity from other suppliers. When using it, the enzyme activity units are determined according to the product specifications provided by the supplier, and the amount to be added in the specific process is calculated accordingly.

[0062] Test Example 1-3:

[0063] Example 1:

[0064] This embodiment aims to illustrate the specific process of producing imitation cupro-ammonia island air layer fabric when using the lower limit values ​​of various process parameters according to the technical solution of the present invention.

[0065] S1. Provided raw material fabric: A knitted fabric with an air-layer structure, the surface layer of which is composed of 42-count cotton yarn, the bottom layer of which is composed of 105D / 36f island-type polyester filament, and the middle layer is woven with 75D ordinary polyester filament as connecting yarn. The weight of this raw material fabric is 280g / m². 2 Of which cotton fiber accounts for 45% of the total weight, island-type polyester fiber and connecting yarn account for 55% of the total weight.

[0066] S2. Micro-cationization pretreatment: Place the raw fabric in an overflow dyeing machine at a liquor ratio of 1:10. Add 0.3% (based on fabric weight percentage, the same below) of glycidyl quaternary ammonium salt modified chitosan obtained in Preparation Example 1 and treat at 40°C for 20 minutes. After treatment, do not drain the liquid and proceed directly to the next step.

[0067] S3. Compound bio-enzyme decoupling and fiber opening: In the above bath, add 1.5% of recombinant polyester hydrolase (enzyme activity 200 U / g) and 0.5% of lipase purchased from the supplier described in Preparation Example 2. Adjust the pH to 7.5 using sodium carbonate, then heat to 50°C and treat at this temperature for 60 minutes. After treatment, heat to 95°C and hold for 10 minutes to inactivate the enzymes, then wash with water.

[0068] S4. Temporary shielding layer construction: In a new bath (liquor ratio 1:10), add 2 g / L of sodium alginate, and pad the fabric treated in step S3 at 40°C with a padding rate of 70%, and then dry it.

[0069] S5. Primary Cationicization and Selective Dyeing: The fabric treated in step S4 was placed back into the overflow dyeing machine at a liquor ratio of 1:10. 3.0% of the glycidyl quaternary ammonium salt modified chitosan prepared in Preparation Example 1 and 2.0% of reactive black dye (CIReactiveBlack5) were added. The pH of the dye bath was adjusted to 5.5 using acetic acid. The temperature was then increased to 60°C at a rate of 1.0°C / min and held at this temperature for 60 minutes. After completion, the fabric was washed, soaped, and dried.

[0070] S6. Finishing: The dried fabric is lightly brushed on one side using a high-density carbon fiber brush roller.

[0071] The final cupro-ammonia island air layer fabric has a cotton fiber content of about 38%, a polyester fiber content of about 60%, and the amount of glycidyl quaternary ammonium salt modified chitosan bonded to the surface of the cotton fibers is about 2.0% of the total weight of the fabric.

[0072] Example 2:

[0073] This embodiment aims to illustrate the specific process of producing imitation cupromium island air layer fabric when using the limit values ​​among the various process parameters according to the technical solution of the present invention.

[0074] S1. Provide raw material fabric: Same as in Example 1.

[0075] S2. Trace cationization pretreatment: The treatment process is the same as in Example 1, except that the amount of glycidyl quaternary ammonium salt modified chitosan prepared in Example 1 is adjusted to 0.5%.

[0076] S3. Composite bio-enzyme decoupling and fiber opening: The treatment process is the same as in Example 1, except that the process conditions are adjusted to: pH value 8.0 and treatment temperature 55℃.

[0077] S4. Temporary shielding layer construction: Same as in Example 1.

[0078] S5. Main cationization and selective staining: The treatment process is the same as in Example 1, except that the process conditions are adjusted as follows: 4.0% of the glycidyl quaternary ammonium salt modified chitosan prepared in Example 1 is added; the pH of the dye bath is 6.0; the temperature is increased to 75°C at a rate of 1.2°C / min, and held at this temperature for 50 minutes.

[0079] S6. Post-processing: Same as Example 1.

[0080] The final cuprammonium island air layer fabric has approximately 3.0% of the total fabric weight in terms of the amount of glycidyl quaternary ammonium salt modified chitosan bonded to the surface of the cotton fibers.

[0081] Example 3:

[0082] This embodiment aims to illustrate the specific process of producing imitation cupro island air layer fabric when using the upper limit values ​​of each process parameter according to the technical solution of the present invention.

[0083] S1. Provide raw material fabric: Same as in Example 1.

[0084] S2. Trace cationization pretreatment: The treatment process is the same as in Example 1, except that the amount of glycidyl quaternary ammonium salt modified chitosan prepared in Example 1 is adjusted to 0.8%.

[0085] S3. Composite bio-enzyme decoupling and fiber opening: The treatment process is the same as in Example 1, except that the process conditions are adjusted to: pH value 8.5 and treatment temperature 60℃.

[0086] S4. Temporary shielding layer construction: Same as in Example 1.

[0087] S5. Main cationization and selective staining: The treatment process is the same as in Example 1, except that the process conditions are adjusted as follows: 5.0% of the glycidyl quaternary ammonium salt modified chitosan prepared in Example 1 is added; the pH of the dye bath is 6.5; the temperature is increased to 85°C at a rate of 1.5°C / min, and held at this temperature for 40 minutes.

[0088] S6. Post-processing: Same as Example 1.

[0089] The final cupro-ammonia-inspired island-of-sea air-layer fabric uses approximately 4.0% of the total fabric weight of epichlorohydrin-modified chitosan bonded to the cotton fiber surface.

[0090] Comparative Examples 1-3:

[0091] Comparative Example 1:

[0092] Compared to Example 2, the difference lies in that steps S2 and S3 are not used; instead, a traditional high-temperature strong alkali method is employed for fiber opening treatment. Specifically, the raw material fabric is placed in a sodium hydroxide solution with a concentration of 30 g / L and treated at 98°C for 60 minutes. After neutralization and washing, it undergoes conventional dyeing and finishing. Everything else remains the same.

[0093] Comparative Example 2:

[0094] Compared to Example 2, the difference lies in that the trace cationization pretreatment in step S2 is omitted. That is, after step S1, the composite bio-enzyme decoupling and fiber-opening treatment in step S3 is performed directly. The remaining steps are the same.

[0095] Comparative Example 3:

[0096] Compared to Example 2, the difference lies in that the temporary shielding layer construction in step S4 is omitted. That is, after processing and washing in step S3, the main cationization and selective staining in step S5 are performed directly without further processing in step S4. The remaining steps are the same.

[0097] Test example:

[0098] Test Example: Fabric Performance Testing

[0099] The imitation cupro island air layer fabrics finally obtained in Examples 1-3 and Comparative Examples 1-3 were subjected to 24 hours of conditioning under standard atmospheric conditions (temperature 20±2℃, relative humidity 65±5%), and then their performance was tested according to the following method.

[0100] Fabric breaking strength test: The test was conducted according to GB / T3923.1-2013 "Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break - Strip Method". A 300mm × 50mm strip was cut from the sample. A tensile strength tester was used, with the instrument spacing set to 200mm and the tensile speed to 100mm / min. The maximum force required for the strip to break was recorded. Each sample was tested five times in the warp direction, and the average value was taken.

[0101] Fabric softness test: Performed according to GB / T18318.1-2009 "Textiles - Determination of bending properties - Part 1: Inclined plane method". Cut a 200mm × 25mm strip from the sample. Place it on a 41.5° inclined plane of the bending performance tester, and slowly and uniformly advance the strip until its front end bends and touches the inclined plane due to its own weight. Record the overhang length of the strip on the platform at this moment, i.e., the bending length. The smaller the bending length value, the softer the fabric. Test each sample 5 times in the warp direction and take the average value.

[0102] Fabric frosting effect evaluation: Using a Datacolor SF600X computer colorimeter under D65 light source and a 10° viewing angle, the apparent color depth (K / S value) of the cotton and polyester fiber areas on the fabric surface was tested. The frosting effect of the fabric was quantitatively evaluated by calculating the difference in K / S values ​​between the two areas (ΔK / S = K / S cotton - K / S polyester). The larger the ΔK / S value, the stronger the color contrast between cotton and polyester fibers, and the more significant the frosting effect.

[0103] The color fastness to washing of the fabric was tested according to GB / T3921-2008 "Textiles - Tests for color fastness - Color fastness to washing". The test conditions were C2S: soap concentration 5 g / L, temperature 60℃, and treatment time 30 minutes. The original color change grade of the sample and the staining grade on adjacent polyester and cotton lining fabrics were assessed using a gray scale.

[0104] The color fastness to rubbing of fabrics was tested according to GB / T3920-2008 "Textiles - Tests for color fastness to rubbing". A standard white rubbing cloth was placed on a standard rubbing head (pressure 9N) using a rubbing fastness tester, and the sample was subjected to 10 cycles of dry rubbing and wet rubbing respectively. The staining grade of the white rubbing cloth was assessed using a gray scale.

[0105] Performance test results:

[0106] The data obtained from the above tests are summarized in Table 1 below.

[0107] Table 1. Performance test results of fabrics in the examples and comparative examples

[0108] Test item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Breaking strength / N (warp) 465 482 471 358 421 478 Softness (bend length) / mm (warp) 32.1 29.5 30.8 45.6 36.4 30.1 Chalkiness effect (ΔK / S) 10.5 12.8 12.1 2.1 12.5 1.8 Fastness to soaping color change / grade 4-5 4-5 4-5 3-4 4-5 4 Fastness to soaping dye transfer to nylon / grade 4 4-5 4-5 3 4 2-3 Dry rubbing fastness / grade 4 4-5 4 3 4-5 4 Wet rubbing fastness / grade 3-4 4 3-4 2-3 3-4 3

[0109] In summary, the test data in Table 1 show that the fabrics prepared by the technical solution provided by this invention have significant differences in key performance characteristics.

[0110] Table 1 shows that the fabrics obtained in Examples 1-3 have significantly higher breaking strength than those in Comparative Example 1, and significantly lower softness (bending length) than those in Comparative Example 1. This is because the proposed method uses a low-temperature composite bio-enzyme for fiber opening, replacing the high-temperature strong alkali treatment. The selective action mechanism of this enzymatic hydrolysis process avoids the drastic degradation of cotton cellulose macromolecules by high-temperature strong alkali, thus preserving the original physical strength and natural softness of the cotton fibers. Compared with Comparative Example 2, the fabrics in the Examples also exhibit better strength and softness, confirming that the protective layer formed on the surface of the cotton fibers by the micro-cationization pretreatment step effectively reduces the potential impact of subsequent enzyme preparations on the cotton fibers.

[0111] The fabrics of Examples 1-3 achieved a significantly higher frosting effect (ΔK / S value) than Comparative Example 3. The mechanism lies in the fact that the temporary shielding layer constructed in step S4 effectively hinders the diffusion and adsorption of cationic agents and anionic dyes to the polyester fiber surface in the subsequent step S5. This precisely confines the cationization reaction and dye adsorption to the cotton fibers, resulting in a high-contrast color difference. Comparative Example 3, lacking this shielding step, resulted in both cotton and polyester fibers being cationicized and dyed, thus failing to achieve an effective frosting effect.

[0112] Furthermore, the fabrics prepared in the examples achieved high levels of colorfastness to soaping and rubbing. This is because after the cotton fibers undergo primary cationization treatment, the surface is loaded with a large number of positive charges, forming strong electrostatic attraction and covalent bonds with anionic dyes, thus improving the fixation of the dyes on the fibers. By integrating the technical features of the above steps, this method achieves a balance between the mechanical properties, functional appearance, and colorfastness of the fabric under mild process conditions.

[0113] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cupro-like island-sea air-layer fabric, composed of cotton and polyester fibers, characterized in that, By weight percentage, including: Cotton fiber 35-55%; Polyester fiber 45-65%; Furthermore, the surface of the cotton fiber is covalently bonded with glycidyl quaternary ammonium salt modified chitosan, and the amount of chitosan used is 2.0% to 4.0% of the total weight of the fabric.

2. The cupro-like island air layer fabric according to claim 1, characterized in that, The cotton fiber is derived from 42-count cotton yarn, and the polyester fiber is derived from 105D island-type polyester filament and 75D ordinary polyester filament as connecting yarn.

3. A method for producing a cupro-like island-type air layer fabric as described in any one of claims 1-2, characterized in that, Includes the following steps: S1. A raw material fabric made of interwoven cotton fibers and island-type polyester fibers; S2. Perform a micro-cationization pretreatment on the raw material fabric to form a cation protective layer on the surface of the cotton fibers; S3. The fabric treated in step S2 is subjected to decoupling and fiber opening treatment with a composite biological enzyme preparation under low temperature conditions to hydrolyze the sea component in the island-type polyester fiber, thereby forming the polyester fiber required to constitute the final product. S4. The fabric treated in step S3 is treated with a soluble functional polymer to form a temporary shielding layer on the surface of the polyester fibers. S5. The fabric treated in step S4 is subjected to main cationization treatment and dyeing treatment in the same bath, thereby bonding the glycidyl quaternary ammonium salt modified chitosan to the cotton fiber and completing selective dyeing, thereby obtaining the imitation cuprammonium island air layer fabric.

4. The method for producing the imitation cupro-ammonia island air layer fabric according to claim 3, characterized in that, In step S2, the cationic agent used in the micro-cationization pretreatment is glycidyl quaternary ammonium salt modified chitosan, and its dosage is 0.3% to 0.8% of the fabric weight.

5. The method for producing the imitation cupro-ammonia island air layer fabric according to claim 3, characterized in that, In step S3, the composite biological enzyme preparation contains recombinant polyester hydrolase and lipase or keratinase.

6. The method for producing the imitation cupro-ammonia island air layer fabric according to claim 3, characterized in that, In step S3, the low-temperature conditions are a temperature of 50°C to 60°C and a pH value of 7.5 to 8.

5.

7. The method for producing the imitation cupro-ammonia island air layer fabric according to claim 3, characterized in that, In step S4, the soluble functional polymer is sodium carboxymethyl cellulose or sodium alginate.

8. The method for producing the imitation cupro-ammonia island air layer fabric according to claim 3, characterized in that, The specific operation process of step S5 includes: In the bath containing the fabric after step S4, add the glycidyl quaternary ammonium salt modified chitosan and anionic dye used in the main cationization treatment. Adjust the pH of the dye bath to 5.5-6.5; The temperature is increased to 60-85℃ at a rate of 1.0-1.5℃ / min and held at this temperature for 40-60 minutes to bond the glycidyl quaternary ammonium salt modified chitosan to the cotton fiber and complete selective dyeing, thereby obtaining the imitation cuprammonium island air layer fabric.

9. The method for producing the imitation cupro-ammonia island air layer fabric according to claim 3, characterized in that, After step S5, a step of lightly brushing the fabric is also included, wherein the brushing is performed using a high-density carbon fiber or ceramic fiber brush roller.