Bio-based super-soft cool antibacterial knitted fabric and preparation method thereof

Abstract

The invention provides a bio-based super-soft cool antibacterial knitted fabric and a preparation method thereof. The preparation method comprises the following steps: step 1, blending modified nanometer jade powder and PLA master batch, and carrying out melt spinning through a double-screw extruder to obtain cool fibers; 2, polyamide is mixed with the mango seed kernel extract and the polythiophene nano shell powder, and hollow fibers are obtained through wet spinning; 3, combing and drawing PLA fibers, the hollow fibers and the cool fibers to obtain blended yarns; 4, the PLA fibers and the blended yarn serve as outer layer yarn, the hollow fibers serve as inner layer yarn, a double-face circular weft knitting machine is adopted for knitting, and gray fabric is obtained; and step 5, carrying out low-temperature dyeing and post-treatment on the gray fabric to obtain the bio-based super-soft cool antibacterial knitted fabric. By optimizing the addition amount of the nanometer jade powder, the proportion of a marriage house and a low-temperature post-treatment process, collaborative improvement of cool feeling, antibiosis, breathability and super softness is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of knitted fabrics, in particular to a bio-based ultra-soft, cool, antibacterial knitted fabric and a preparation method thereof. Background Art

[0002] With the growing consumer demand for functional textiles, fabrics that combine environmental friendliness, comfort, and health protection have become a research hotspot in the textile industry. With the arrival of summer, consumers often choose cooling fabrics that provide an instantaneous or sustained cooling sensation. Currently, mainstream cooling fabrics are typically made of pure cotton or nylon blends, relying on the fiber's moisture absorption to achieve temporary cooling, but their performance is significantly limited. For example, while pure cotton fabrics are skin-friendly and breathable, they dry slowly after absorbing moisture, making them prone to feeling stuffy. Nylon synthetic fibers can improve moisture conduction and quick-drying properties through profiled cross-sections or chemical finishing, but their petroleum-based origin is not environmentally friendly. Furthermore, traditional cooling technologies can enhance functionality by adding chemical cooling agents, but this approach suffers from ecological toxicity, limited functionality, and insufficient durability.

[0003] Existing inorganic cooling fillers, such as nano-jade powder, have poor compatibility with polymer matrices. Traditional blended spinning processes easily cause particle agglomeration, resulting in a stiff feel and reduced breathability, creating a conflict between the fabric's cooling properties and comfort. Furthermore, existing cooling fabrics are often required to possess antimicrobial properties. Currently, most cooling fabrics utilize chemical antimicrobial agents, such as anions or quaternary ammonium salts. While these agents offer high antimicrobial efficacy, they carry the risk of technical precipitation and can easily lead to functional antagonism.

[0004] Therefore, further research and development is needed to prepare a functional fabric that is soft, cool and has antibacterial properties. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present invention provides a bio-based ultra-soft, cool, antibacterial knitted fabric and a preparation method thereof, which solves the problems raised in the above-mentioned background technology.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] According to a first aspect of the present invention, a method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric is provided, comprising the following steps:

[0010] Step 1: blending modified nano jade powder with PLA masterbatch, and melt spinning through a twin-screw extruder to obtain a cool fiber;

[0011] Step 2: mixing polyamide with mango seed core extract and polythiophene nanoshell powder, and obtaining hollow fibers by wet spinning;

[0012] Step 3, combing and drawing the PLA fiber, the hollow fiber and the cooling fiber to obtain a blended yarn;

[0013] Step 4: using the PLA fiber and the blended yarn as the outer layer yarn and the hollow fiber as the inner layer yarn, and weaving them using a double-sided circular knitting machine to obtain a grey fabric;

[0014] Step 5: low-temperature dyeing and post-processing the grey fabric to obtain the bio-based ultra-soft, cool, antibacterial knitted fabric.

[0015] Preferably, in step 1, the amount of the alkyl-modified nano jade powder added is 0.8-1.2% of the PLA masterbatch;

[0016] The temperature of the melt spinning is 180-220°C.

[0017] Preferably, the preparation method of the modified nano jade powder is as follows:

[0018] A. Dissolve γ-aminopropyltriethoxysilane in ethanol, adjust the pH to 4-5 with acetic acid, and hydrolyze to obtain a pretreatment solution;

[0019] B. Adding nano jade powder to the pretreatment solution, stirring for reaction, and after the reaction is completed, centrifugally washing with ethanol and vacuum drying to obtain the modified nano jade powder.

[0020] Preferably, the volume ratio of γ-aminopropyltriethoxysilane to ethanol is 7 to 9:1;

[0021] The hydrolysis time is 10 to 30 minutes;

[0022] The mass ratio of the nano jade powder to the pretreatment solution is 1:20-50;

[0023] The stirring reaction is carried out at a temperature of 60 to 80° C. and for a time of 4 to 6 hours.

[0024] Preferably, in step 2, the mass of the mango seed core extract is 5-8% of the polyamide, and the mass of the polythiophene nanoshell powder is 3-5% of the polyamide;

[0025] The conveying speed of the wet spinning is 0.5-0.6 mL / min, the outer diameter of the spinneret is 1.2-1.4 mm, and the inner diameter is 0.7-0.9 mm.

[0026] Preferably, in step 3, the amount of PLA fiber added to the blended yarn is 50-65%, the amount of hollow fiber added is 15-20%, and the amount of cooling fiber added is 15-30%.

[0027] Preferably, in step 5, the low-temperature dyeing method is as follows: citric acid is added to the stevia extract, and the mixture is kept at 60° C. for 20 minutes at a bath ratio of 1:10.

[0028] Preferably, in step 5, the post-processing steps are as follows:

[0029] The dyed blank is placed in a nano jade powder dispersion for padding treatment and shaped. After shaping, a chitosan-fig leaf extract composite liquid is sprayed on the blank and freeze-dried to form a porous antibacterial film.

[0030] Preferably, the concentration of the nano jade powder dispersion is 4-6%;

[0031] The setting temperature is 10-130°C and the time is 30s;

[0032] The total phenol content in the chitosan-fig leaf extract composite liquid is 40 mg / mL.

[0033] According to a second aspect of the present invention, there is provided a bio-based ultra-soft, cool, antibacterial knitted fabric obtained according to the above-mentioned preparation method.

[0034] Beneficial effects

[0035] The present invention provides a bio-based ultra-soft, cool, antibacterial knitted fabric and a preparation method thereof. It has the following beneficial effects:

[0036] (1) This proposal provides a method for preparing a bio-based ultra-soft, cool, and antibacterial knitted fabric. Nano-jade powder is modified with a silane coupling agent, and its interfacial bonding with PLA is enhanced through chemical bonding, thereby avoiding particle agglomeration and improving the thermal conductivity of the fiber. Mango seed core extract is then compounded with polythiophene nano-shell powder, and the electrical conductivity of polythiophene is used to promote the slow release of antibacterial ingredients, thereby achieving long-term antibacterial effect.

[0037] (2) This proposal provides a method for preparing a bio-based ultra-soft, cool, and antibacterial knitted fabric. By blending hollow fibers with PLA fibers and cool fibers, a gradient structure of "moisture-conducting outer layer + temperature-locking inner layer" can be constructed. Combined with double-sided circular knitting machines, a three-dimensional breathable network is formed to enhance the cool feeling and comfort.

[0038] (3) This proposal provides a method for preparing a bio-based ultra-soft, cool, and antibacterial knitted fabric. The method uses a low-temperature dyeing process that synergizes stevia extract and citric acid to reduce thermal damage to PLA fibers. At the same time, the chitosan-fig leaf extract composite liquid spraying and freeze-drying technology are combined to form a porous antibacterial film on the surface of the fabric, which combines a soft and tough touch with a durable function. DETAILED DESCRIPTION

[0039] In order to better illustrate the content of the present invention, it is described below in conjunction with specific embodiments.

[0040] The preparation method of the mango seed extract in this application is as follows:

[0041] First, the mango seed core is cleaned, dried at 50-60° C. until the moisture content is less than 8%, and pulverized through a 60-80 mesh sieve to obtain a powder. Then, a 60-80% ethanol solution is prepared, and the powder and the ethanol solution are mixed at a solid-to-liquid ratio of 1:15-20. Ultrasonic-assisted extraction is performed at 60-70° C. for 30-60 minutes. Finally, the residue is removed by centrifugation at 4000 rpm for 15 minutes. The filtrate is concentrated to 1 / 5-1 / 10 of the original volume by a rotary evaporator at 50-60° C., and freeze-dried to obtain a powdered mango seed core extract.

[0042] The preparation method of the chitosan-fig leaf composite liquid in this application is as follows:

[0043] First, fresh fig leaves were washed, dried at 50°C to constant weight, crushed and passed through a 40-mesh sieve, and then prepared with a 70% ethanol solution. The fig leaf powder and ethanol solution were mixed at a solid-liquid ratio of 1:15, and refluxed at 80°C for 2 h. The extract was centrifuged and concentrated by rotary evaporation to 1 / 5 of its original volume, and then freeze-dried to obtain a powder.

[0044] Dissolve chitosan in 1% acetic acid solution to obtain a mixed solution with a mass concentration of 2%, and let it stand for degassing;

[0045] Fig leaf extract powder was added to chitosan solution at a total content of 40 mg / mL, magnetically incubated for 30 min, the pH was adjusted to 5.5-6.0 with 5% NaOH solution, 10% glycerol by weight of chitosan was added, and finally the solution was sterilized by filtration through a 0.22 μm filter membrane and stored at 4°C in the dark.

[0046] Example 1

[0047] Preparation of modified nano jade powder: γ-aminopropyltriethoxysilane and ethanol were mixed in a volume ratio of 9:1, the pH was adjusted to 4.5 with acetic acid, and the mixture was hydrolyzed for 20 minutes. Nano jade powder was then added in a mass ratio of 1:30, and the mixture was stirred at 70°C for 5 hours. The mixture was washed with ethanol and then vacuum dried to obtain the modified nano jade powder.

[0048] Preparation of cooling fiber: 1% modified nano jade powder was blended with PLA masterbatch and melt-spun through a twin-screw extruder at 200°C to obtain cooling fiber;

[0049] Preparation of hollow fibers: 6% mango seed kernel extract, 4% polythiophene nanoshell powder, and polyamide were mixed and wet-spun at an output speed of 0.55 mL / min using a spinneret with an outer diameter of 1.3 mm and an inner diameter of 0.8 mm to produce hollow fibers.

[0050] Preparation of blended yarn: 60% PLA fiber, 18% hollow fiber and 22% cool fiber are combed and drawn to obtain blended yarn;

[0051] Weaving and dyeing: PLA fiber and blended yarn are used as outer yarns, and hollow fiber is used as inner yarns. The fabric is woven using a double-sided circular knitting machine to obtain the fabric. The fabric is then placed in a stevia extract dye vat at a bath ratio of 1:10. After 5 minutes, citric acid is added and the fabric is kept at 60°C for 20 minutes for complete dyeing.

[0052] Post-treatment: The dyed fabric is immersed in a 5% nano-jade powder dispersion for padding treatment, and then shaped at 120°C for 30 seconds. Finally, a chitosan-fig leaf composite liquid is sprayed on the fabric and freeze-dried to form a porous antibacterial film layer on the surface of the fabric to obtain a bio-based ultra-soft and cool antibacterial knitted fabric.

[0053] Example 2

[0054] The preparation method of this embodiment is the same as that of Example 1, except that, during the preparation of the cooling fiber, the mass of the modified nano jade powder accounts for 0.8% of the PLA masterbatch.

[0055] Example 3

[0056] The preparation method of this embodiment is the same as that of Example 1, except that, during the preparation of the cooling fiber, the mass of the modified nano jade powder accounts for 1.2% of the PLA masterbatch.

[0057] Example 4

[0058] The preparation method of this embodiment is the same as that of Example 1, except that, in the preparation process of the blended yarn, 50% PLA fiber, 20% hollow fiber and 30% cool fiber are combed and drawn to obtain the blended yarn.

[0059] Example 5

[0060] The preparation method of this embodiment is the same as that of Example 1, except that, in the preparation process of the blended yarn, 65% PLA fiber, 15% hollow fiber and 20% cool fiber are combed and drawn to obtain the blended yarn.

[0061] Comparative Example 1

[0062] The preparation method of this comparative example is the same as that of Example 1, except that, during the preparation of the cooling fiber, the mass of the modified nano jade powder accounts for 0.6% of the PLA masterbatch.

[0063] Comparative Example 2

[0064] The preparation method of this comparative example is the same as that of Example 1, except that, during the preparation of the cooling fiber, the mass of the modified nano jade powder accounts for 1.3% of the PLA masterbatch.

[0065] Comparative Example 3

[0066] The preparation method of this comparative example is the same as that of Example 1, except that chitosan-fig leaf extract is not sprayed after shaping in the post-treatment step.

[0067] Comparative Example 4

[0068] The preparation method of this comparative example is the same as that of Example 1, except that, in the post-processing step, conventional shaping equipment is used to shape the grey cloth, and after shaping, the grey cloth is slowly cooled, the shaping temperature is 125° C., and the shaping time is 2 min.

[0069] In order to further verify the performance advantages of the new super-elastic, super-soft and cool multifunctional interwoven fabric prepared in this embodiment, performance tests were carried out on the fabrics of this embodiment and the comparative example.

[0070] The test method for contact coolness is: under specified experimental environmental conditions, a heat detection plate with a temperature higher than that of the sample is brought into contact with the sample, the temperature change of the heat detection plate over time is measured, and its contact coolness coefficient (Qmax) is calculated. The larger the Qmax value, the stronger the coolness felt by the skin; the smaller the Qmax value, the weaker the coolness felt by the skin.

[0071] The test results are shown in Table 1.

[0072] Table 1

[0073]

[0074] According to the data comparison of Examples 1-3 and Comparative Examples 1-2, the addition amount of modified nano jade powder is between 0.8 and 1.2, and the cooling coefficient can be stabilized at 0.35 to 0.39 W / cm 2If the addition amount is too low or too high, the cooling coefficient will decrease, indicating that the silane coupling agent can significantly improve the dispersibility of nanoparticles. Excessive addition will also cause particle agglomeration and weaken the thermal conductivity.

[0075] By comparing the data of Examples 1 to 5 and Comparative Example 3, it can be seen that the synergistic effect of mango kernel extract and chitosan-fig leaf composite liquid can maintain the antibacterial rate above 97%. For the spraying antibacterial composite liquid, the antibacterial performance is significantly reduced to 72-75%.

[0076] In Example 4, the proportion of hollow fibers increased by 20%, the air permeability slightly decreased to 820 mm / s, but the bending stiffness decreased to 3.0, and the fabric became softer.

[0077] In Comparative Example 4, long-term shaping under high temperature conditions will cause partial degradation of the PLA fiber, decreased air permeability, and a significant increase in bending stiffness.

[0078] Through the above embodiments, the present invention achieves a synergistic improvement in coolness, antibacterial, breathability and ultra-softness by optimizing the amount of nano jade powder added, the proportion of the wedding room and the low-temperature post-processing process.

[0079] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric, characterized by: The following steps are involved: Step 1: blending modified nano jade powder with PLA masterbatch, and melt spinning through a twin-screw extruder to obtain a cool fiber; Step 2: mixing polyamide with mango seed core extract and polythiophene nanoshell powder, and obtaining hollow fibers by wet spinning; Step 3, combing and drawing the PLA fiber, the hollow fiber and the cooling fiber to obtain a blended yarn; Step 4: using the PLA fiber and the blended yarn as the outer layer yarn and the hollow fiber as the inner layer yarn, and weaving them using a double-sided circular knitting machine to obtain a grey fabric; Step 5: low-temperature dyeing and post-processing the grey fabric to obtain the bio-based ultra-soft, cool, antibacterial knitted fabric.

2. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 1, characterized in that: In step 1, the amount of the alkyl-modified nano jade powder added is 0.8-1.2% of the PLA masterbatch; The temperature of the melt spinning is 180-220°C.

3. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 2, characterized in that: The preparation method of the modified nano jade powder is as follows: A. Dissolve γ-aminopropyltriethoxysilane in ethanol, adjust the pH to 4-5 with acetic acid, and hydrolyze to obtain a pretreatment solution; B. Adding nano jade powder to the pretreatment solution, stirring for reaction, and after the reaction is completed, centrifugally washing with ethanol and vacuum drying to obtain the modified nano jade powder.

4. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 3, characterized in that: The volume ratio of the γ-aminopropyltriethoxysilane to ethanol is 7 to 9:1; The hydrolysis time is 10 to 30 minutes; The mass ratio of the nano jade powder to the pretreatment solution is 1:20 to 50; The stirring reaction is carried out at a temperature of 60 to 80° C. and for a time of 4 to 6 hours.

5. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 1, characterized in that: In step 2, the mass of the mango seed core extract is 5-8% of the polyamide, and the mass of the polythiophene nano shell powder is 3-5% of the polyamide; The conveying speed of the wet spinning is 0.5-0.6 mL / min, the outer diameter of the spinneret is 1.2-1.4 mm, and the inner diameter is 0.7-0.9 mm.

6. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 1, characterized in that: In step 3, the amount of PLA fiber added to the blended yarn is 50-65%, the amount of hollow fiber added is 15-20%, and the amount of cooling fiber added is 15-30%.

7. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 1, characterized in that: In step 5, the low-temperature dyeing method is as follows: citric acid is added to the stevia extract, and the mixture is kept at 60° C. for 20 minutes at a bath ratio of 1:

10.

8. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 1, characterized in that: In step 5, the post-processing steps are as follows: The dyed blank is placed in a nano jade powder dispersion for padding treatment and shaped. After shaping, a chitosan-fig leaf extract composite liquid is sprayed on the blank and freeze-dried to form a porous antibacterial film.

9. The method for preparing a bio-based ultra-soft, cool, antibacterial knitted fabric according to claim 8, characterized in that: The concentration of the nano jade powder dispersion is 4-6%; The setting temperature is 100-130°C and the time is 30s; The total phenol content in the chitosan-fig leaf extract composite liquid is 40 mg / mL.

10. A bio-based ultra-soft, cool, antibacterial knitted fabric obtained according to the preparation method according to any one of claims 1 to 9.

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