Grey yarn cool-feeling knitted brocade-spandex fabric and preparation method thereof

Abstract

The invention discloses a grey yarn cool knitted chinlon-spandex fabric and a preparation method thereof, and relates to the technical field of chinlon-spandex fabrics, the preparation method comprises the following steps: adding chitosan into a solvent, stirring at room temperature, adding polyurethane particles, a TiO2 nanoparticle dispersion liquid and a modified spandex spinning solution, uniformly stirring, and electrospinning to obtain spandex core layer nanofibers; the preparation method comprises the following steps: adding polyamide nanofibers into tetrahydrofuran, adding a tetrahydrofuran solution of 1M borane in a nitrogen atmosphere under an ice bath condition, stirring at room temperature, carrying out a heating reaction, cooling to room temperature, adding methanol for quenching, washing the polyamide nanofibers, and carrying out vacuum drying to obtain polyamide cortex nanofibers; enabling the spandex core layer nanofiber to pass through a glutaraldehyde aqueous solution bath to form a coating, winding and coating the surface of the coating with the chinlon skin layer nanofiber, and drying at room temperature to obtain the chinlon-spandex composite yarn; weaving the brocade-spandex composite yarns into cloth to obtain a knitted brocade-spandex fabric; and carrying out nano-silver deposition post-treatment on the knitted brocade-spandex fabric to obtain the grey yarn cool knitted brocade-spandex fabric.

Description

Technical Field

[0001] The invention relates to the technical field of nylon-spandex fabrics, in particular to a raw yarn cool feeling knitted nylon-spandex fabric and a preparation method thereof. Background Art

[0002] As people's living standards continue to improve, the demand for functionality and comfort of textiles is also increasing. As a composite material that combines elasticity, softness and durability, nylon-spandex fabrics are widely used in sportswear, underwear and casual wear due to their excellent performance. However, there are still many technical bottlenecks in the practical application of traditional nylon-spandex fabrics that need to be solved. First of all, in order to meet the needs of multiple scenarios, nylon-spandex fabrics must have excellent water resistance, antibacterial and cooling properties at the same time, but most of the existing technologies focus on single function optimization and cannot achieve the synergistic improvement of multiple performances.

[0003] At the same time, the market's requirements for fabrics' coolness, antibacterial properties, and durability are constantly increasing, which has also posed new challenges to traditional preparation technologies. Therefore, how to give nylon-spandex fabrics multifunctionality and high durability through material innovation and process improvement while maintaining the original properties of the fabric has become a topic that needs to be urgently addressed in the current technical field. Summary of the invention

[0004] The object of the present invention is to provide a raw yarn cool feeling knitted nylon-spandex fabric and a preparation method thereof, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for preparing a raw yarn cool knitted nylon spandex fabric comprises the following steps: S1: adding chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4-5 hours, adding polyurethane particles, TiO2 nanoparticle dispersion, and modified spandex spinning solution, stirring evenly to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers;

[0007] S2: Add nylon nanofibers to tetrahydrofuran, add 1M borane tetrahydrofuran solution under nitrogen atmosphere and ice bath condition, stir at room temperature for 1-1.5h, heat to 50-55℃ for reaction for 10-11h, cool to room temperature, add methanol for quenching, wash nylon nanofibers with tetrahydrofuran, 1M hydrochloric acid solution, deionized water, 1M sodium hydroxide solution, deionized water, ethanol and acetone in sequence, place in 60-65℃ environment and vacuum dry for 10-12h to obtain nylon skin nanofibers;

[0008] S3: Passing the spandex core layer nanofibers through a glutaraldehyde aqueous solution bath to form a coating, winding and coating the nylon skin layer nanofibers on the surface of the coating, and drying at room temperature to obtain nylon-spandex composite yarns; weaving the nylon-spandex composite yarns into cloth to obtain knitted nylon-spandex fabrics; post-treating the knitted nylon-spandex fabrics with nano-silver deposition to obtain original yarn cool knitted nylon-spandex fabrics.

[0009] Furthermore, the preparation method of the modified spandex spinning solution comprises the following steps: adding polytetramethylene ether glycol to a reaction container, heating to 90-92°C and vacuum drying for 2h, adding diphenylmethane diisocyanate preheated to 70-72°C, keeping the temperature at 90-92°C under vacuum conditions to react until the theoretical NCO value is reached, adding N,N-dimethylacetamide, stirring evenly, adding a dimethyl sulfoxide solution of polyhexamethyleneguanidine hydrochloride, keeping the temperature at 90-92°C and reacting for 20-25min to obtain a modified spandex spinning solution.

[0010] Furthermore, in the preparation process of the modified spandex spinning solution, the molar ratio of polytetramethylene ether glycol: diphenylmethane diisocyanate: polyhexamethyleneguanidine hydrochloride is (0.061-0.072):(0.1165-0.1168):0.0555.

[0011] Furthermore, the preparation method of polyhexamethyleneguanidine hydrochloride comprises the following steps: adding guanidine hydrochloride and 1 / 3 of hexamethylenediamine into a reaction container, heating to 120-125° C. for reaction for 3-3.5 hours, adding the remaining 2 / 3 of hexamethylenediamine, heating to 140-145° C. for reaction for 8-8.5 hours, and placing the product in an environment of 85-87° C. for vacuum drying for 48 hours to obtain polyhexamethyleneguanidine hydrochloride.

[0012] Furthermore, in the preparation process of the polyhexamethyleneguanidine hydrochloride, the molar ratio of guanidine hydrochloride to hexamethylenediamine is 1:1.

[0013] Furthermore, in the preparation process of the spandex core layer spinning solution, the mass ratio of polyurethane particles: chitosan: modified spandex spinning solution is (85-95): (5-15): (0.5-1); the TiO2 nanoparticle dispersion is obtained by ultrasonically dispersing TiO2 nanoparticles in N,N-dimethylformamide, and the amount of TiO2 nanoparticles added is 1-1.5wt% of the mass of the polyurethane particles; the concentration of the spandex core layer spinning solution is 15-16w / v%; in the preparation process of the spandex core layer nanofibers, the electrospinning parameters include: applied voltage of 14.5-17kV, distance from needle tip to collector of 14-22cm, and spinning solution flow rate of 0.5-0.7mL / h.

[0014] In the mixed solution of trifluoroacetic acid and dichloromethane, the volume ratio of trifluoroacetic acid to dichloromethane is 7:3;

[0015] Furthermore, the nanosilver deposition post-treatment process comprises the following steps: step (1): adding dopamine hydrochloride to deionized water, adding Tris to adjust the pH of the solution to 8.5, adding copper sulfate pentahydrate solution and hydrogen peroxide solution, immersing the knitted nylon-spandex fabric therein, treating at room temperature for 30-45 minutes, washing with deionized water, placing in a 60-65°C environment and vacuum drying for 12-16 hours, to obtain a modified knitted nylon-spandex fabric;

[0016] Step (2): Add silver nitride to deionized water, add ammonia water until the solution is transparent, immerse the modified knitted nylon-spandex fabric therein, add glucose solution, react at room temperature for 30-45 minutes, wash with deionized water, expose to glutaraldehyde atmosphere for 24 hours, place in a 60-65°C environment and vacuum dry for 12-24 hours to obtain a cool knitted nylon-spandex fabric.

[0017] Furthermore, in the preparation process of the modified knitted nylon-spandex fabric, the concentration of the copper sulfate pentahydrate solution is 1.8-2g / L, and the concentration of the hydrogen peroxide solution is 0.6ml / L; in the preparation process of the original yarn cool knitted nylon-spandex fabric, the concentration of the glucose solution is 12g / L; and the glutaraldehyde atmosphere is provided by a 50wt% glutaraldehyde aqueous solution.

[0018] Furthermore, during the preparation of the nylon-spandex composite yarn, the concentration of the glutaraldehyde aqueous solution is 17-20wt%.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention utilizes borane-tetrahydrofuran to reduce the secondary amine on the surface of polyamide nanofibers to activate the active functional groups on the surface of polyamide, and then controls the content of chitosan in the polyurethane-chitosan mixed polymer solution to prepare a spandex core material with a suitable diameter. Finally, glutaraldehyde is used as a cross-linking layer between the spandex core material and the nylon skin material (activated polyamide nanofibers), which greatly enhances the adhesion between the nanofibers and provides a basic condition for the water resistance of the nylon-spandex fabric prepared subsequently.

[0021] 2. In order to further enhance the antibacterial properties of nylon-spandex fabrics, the present invention uses polyhexamethyleneguanidine hydrochloride as a functional segment to replace the diamine in ordinary spandex, and synthesizes a spandex spinning solution with a special antibacterial segment. Under normal spinning conditions, a specific amount of spandex spinning solution with a special antibacterial segment is added to ordinary spandex spinning solution, and an appropriate amount of TiO2 nanoparticle dispersion is added to prepare spandex nanofibers with intrinsic antibacterial activity. By introducing special segments into spandex, the antibacterial properties of nylon-spandex fabrics are enhanced, and the problem of reduced service life caused by the seepage of antibacterial agents in traditional antibacterial materials during repeated washing of the fabrics is solved.

[0022] 3. In order to further enhance the cooling properties of nylon-spandex fabrics, the fiber surface is modified using a dopamine / copper sulfate / hydrogen peroxide system to enhance the binding force between the fiber and the silver nanoparticles and to increase the deposition rate and chemical stability of the silver nanoparticles. The present invention deposits silver nanoparticles on the surface of the fabric. On the one hand, the thermal conductivity of the nylon-spandex fabric is improved, and the contact cooling coefficient during contact with the skin is increased. On the other hand, it can reflect infrared radiation from external heat sources and reduce the heat absorption performance of the fabric, so that the fabric can reduce the influence of external heat sources while dissipating heat and being breathable, thereby providing a long-lasting cooling experience. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the following examples, the specification of polyamide 6 is: Mw=35000; the specification of polytetramethylene ether glycol is: Mn=1800; the specification of chitosan is: deacetylation degree=85%; and the other raw materials are all commercially available.

[0025] The preparation method of nylon nanofiber comprises the following steps: adding formic acid to polyamide 6, stirring evenly, preparing 15wt% nylon spinning solution, electrospinning the nylon spinning solution to obtain nylon nanofiber; the electrospinning parameters include: applying a voltage of 15kV, a distance from a needle tip to a collector of 22cm, and a spinning solution flow rate of 0.25mL / h.

[0026] The preparation method of polyhexamethyleneguanidine hydrochloride comprises the following steps: adding 0.3 mol of guanidine hydrochloride and 0.1 mol of hexamethylenediamine into a reaction container, heating to 120°C for reaction for 3 hours, adding the remaining 0.2 mol of hexamethylenediamine, heating to 140°C for reaction for 8 hours, placing the product in an environment of 85°C for vacuum drying for 48 hours, and obtaining polyhexamethyleneguanidine hydrochloride.

[0027] The preparation method of modified spandex spinning solution comprises the following steps: adding 0.061 mol of polytetramethylene ether glycol into a reaction container, heating to 90°C and vacuum drying for 2 hours, adding 0.1165 mol of diphenylmethane diisocyanate preheated to 70°C, keeping the temperature at 90°C under vacuum conditions to react until the theoretical NCO value is reached, adding N,N-dimethylacetamide, stirring evenly, adding 0.0555 mol of dimethyl sulfoxide solution of polyhexamethyleneguanidine hydrochloride, keeping the temperature at 90°C and reacting for 20 minutes to obtain the modified spandex spinning solution.

[0028] Embodiment 1: A method for preparing a raw yarn cool knitted nylon spandex fabric, comprising the following steps: S1: adding 5g of chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4h, adding 95g of polyurethane particles, a TiO2 nanoparticle dispersion containing 9.5g of TiO2 nanoparticles, and 0.5g of modified spandex spinning solution, stirring evenly, to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers; the electrospinning parameters include: applied voltage of 14.5kV, a distance from the needle tip to the collector of 14cm, and a spinning solution flow rate of 0.5mL / h;

[0029] S2: Add nylon nanofibers to tetrahydrofuran, add 1M borane tetrahydrofuran solution under nitrogen atmosphere and ice bath condition, stir at room temperature for 1 hour, heat to 50°C for 10 hours, cool to room temperature, add methanol for quenching, wash nylon nanofibers with tetrahydrofuran, 1M hydrochloric acid solution, deionized water, 1M sodium hydroxide solution, deionized water, ethanol, and acetone in sequence, place in a 60°C environment and vacuum dry for 10 hours to obtain nylon skin nanofibers;

[0030] S3: passing the spandex core layer nanofibers through a 17 wt% glutaraldehyde aqueous solution bath to form a coating, winding and coating the nylon skin layer nanofibers on the surface of the coating, and drying at room temperature to obtain a nylon-spandex composite yarn; weaving the nylon-spandex composite yarn into a cloth to obtain a knitted nylon-spandex fabric;

[0031] S4: dopamine hydrochloride was added to deionized water, Tris was added to adjust the pH value of the solution to 8.5, 1.8 g / L copper sulfate pentahydrate solution and 0.6 mL / L hydrogen peroxide solution were added, the knitted nylon-spandex fabric was immersed therein, treated at room temperature for 30 min, washed with deionized water, and placed in a 60°C environment for vacuum drying for 12 h to obtain a modified knitted nylon-spandex fabric;

[0032] S5: Add silver nitride to deionized water, add ammonia water until the solution is transparent, immerse the modified knitted nylon-spandex fabric therein, add 12 g / L glucose solution, react at room temperature for 30 min, wash with deionized water, expose to glutaraldehyde atmosphere for 24 h, place in a 60°C environment and vacuum dry for 12 h to obtain the original yarn cool knitted nylon-spandex fabric.

[0033] Embodiment 2: A method for preparing a raw yarn cool knitted nylon spandex fabric, comprising the following steps: S1: adding 10g of chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4h, adding 90g of polyurethane particles, a TiO2 nanoparticle dispersion containing 9.0g of TiO2 nanoparticles, and 0.5g of modified spandex spinning solution, stirring evenly to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers; the electrospinning parameters include: applied voltage of 14.5kV, distance from needle tip to collector of 14cm, and spinning solution flow rate of 0.5mL / h;

[0034] The remaining steps are the same as those in Example 1.

[0035] Embodiment 3: A method for preparing a raw yarn cool knitted nylon spandex fabric, comprising the following steps: S1: adding 15g of chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4h, adding 85g of polyurethane particles, a TiO2 nanoparticle dispersion containing 8.5g of TiO2 nanoparticles, and 0.5g of modified spandex spinning solution, stirring evenly to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers; the electrospinning parameters include: applied voltage of 14.5kV, distance from needle tip to collector of 14cm, and spinning solution flow rate of 0.5mL / h;

[0036] The remaining steps are the same as those in Example 1.

[0037] Embodiment 4: A method for preparing a raw yarn cool knitted nylon spandex fabric, comprising the following steps: S1: adding 15g of chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4h, adding 85g of polyurethane particles, a TiO2 nanoparticle dispersion containing 8.5g of TiO2 nanoparticles, and 1g of modified spandex spinning solution, stirring evenly to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers; the electrospinning parameters include: applied voltage of 14.5kV, distance from needle tip to collector of 14cm, and spinning solution flow rate of 0.5mL / h;

[0038] The remaining steps are the same as those in Example 1.

[0039] Comparative Example 1: A method for preparing a raw yarn cool knitted nylon spandex fabric, comprising the following steps: S1: adding 5g of chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4h, adding 95g of polyurethane particles, a TiO2 nanoparticle dispersion containing 9.5g of TiO2 nanoparticles, and 0.5g of modified spandex spinning solution, stirring evenly, to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers; the electrospinning parameters include: an applied voltage of 14.5kV, a distance from the needle tip to the collector of 14cm, and a spinning solution flow rate of 0.5mL / h;

[0040] S2: Add nylon nanofibers to tetrahydrofuran, add 1M borane tetrahydrofuran solution under nitrogen atmosphere and ice bath condition, stir at room temperature for 1 hour, heat to 50°C for 10 hours, cool to room temperature, add methanol for quenching, wash nylon nanofibers with tetrahydrofuran, 1M hydrochloric acid solution, deionized water, 1M sodium hydroxide solution, deionized water, ethanol, and acetone in sequence, place in a 60°C environment and vacuum dry for 10 hours to obtain nylon skin nanofibers;

[0041] S3: passing the spandex core layer nanofibers through a 17 wt% glutaraldehyde aqueous solution bath to form a coating, winding and coating the nylon skin layer nanofibers on the surface of the coating, and drying at room temperature to obtain a nylon-spandex composite yarn; weaving the nylon-spandex composite yarn into a cloth to obtain a knitted nylon-spandex fabric;

[0042] S4: The knitted nylon-spandex fabric is soaked in a silver-ammonia solution for 48 hours. After washing, it is soaked in a 1wt% glucose solution, heated to 30°C for reaction for 90 minutes, washed with deionized water, and placed in a 60°C environment for vacuum drying for 12 hours to obtain the original yarn cool knitted nylon-spandex fabric.

[0043] Comparative Example 2: A method for preparing a raw yarn cool knitted nylon spandex fabric, comprising the following steps: S1: adding 5g of chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4h, adding 95g of polyurethane particles, a TiO2 nanoparticle dispersion containing 9.5g of TiO2 nanoparticles, and 0.5g of modified spandex spinning solution, stirring evenly to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers; the electrospinning parameters include: an applied voltage of 14.5kV, a distance from the needle tip to the collector of 14cm, and a spinning solution flow rate of 0.5mL / h;

[0044] S2: Add nylon nanofibers to tetrahydrofuran, add 1M borane tetrahydrofuran solution under nitrogen atmosphere and ice bath condition, stir at room temperature for 1 hour, heat to 50°C for 10 hours, cool to room temperature, add methanol for quenching, wash nylon nanofibers with tetrahydrofuran, 1M hydrochloric acid solution, deionized water, 1M sodium hydroxide solution, deionized water, ethanol, and acetone in sequence, place in a 60°C environment and vacuum dry for 10 hours to obtain nylon skin nanofibers;

[0045] S3: passing the spandex core layer nanofibers through a 17 wt% glutaraldehyde aqueous solution bath to form a coating, winding and coating the nylon skin layer nanofibers on the surface of the coating, and drying at room temperature to obtain a nylon-spandex composite yarn; weaving the nylon-spandex composite yarn into a cloth to obtain a knitted nylon-spandex fabric;

[0046] S4: dopamine hydrochloride was added to deionized water, Tris was added to adjust the pH value of the solution to 8.5, 1.8 g / L copper sulfate pentahydrate solution and 0.6 mL / L hydrogen peroxide solution were added, the knitted nylon-spandex fabric was immersed therein, treated at room temperature for 30 min, washed with deionized water, and placed in a 60°C environment for vacuum drying for 12 h to obtain a modified knitted nylon-spandex fabric;

[0047] S5: Add silver nitride to deionized water, add ammonia water until the solution is transparent, immerse the modified knitted nylon-spandex fabric therein, add 12 g / L glucose solution, react at room temperature for 30 min, wash with deionized water, place in a 60°C environment and vacuum dry for 12 h to obtain the original yarn cool knitted nylon-spandex fabric.

[0048] Comparative Example 3: A method for preparing a raw yarn cool knitted nylon-spandex fabric, comprising the following steps: S1: adding formic acid to polyamide 6, stirring evenly, preparing 15wt% nylon spinning solution, and electrospinning the nylon spinning solution to obtain nylon cortical nanofibers; the electrospinning parameters include: applied voltage of 15kV, distance from needle tip to collector of 22cm, spinning solution flow rate of 0.25mL / h;

[0049] S2: adding polyurethane to N,N-dimethylformamide, stirring evenly, preparing 17wt% spandex spinning solution, electrospinning the spandex spinning solution to obtain spandex core nanofibers; the electrospinning parameters include: applying a voltage of 16kV, a distance from the needle tip to the collector of 22cm, and a spinning solution flow rate of 0.5mL / h;

[0050] S3: Wrapping the nylon skin nanofibers around the surface of the spandex core nanofibers to obtain a nylon-spandex composite yarn; weaving the nylon-spandex composite yarn into a cloth to obtain a knitted nylon-spandex fabric;

[0051] S4: dopamine hydrochloride was added to deionized water, Tris was added to adjust the pH value of the solution to 8.5, 1.8 g / L copper sulfate pentahydrate solution and 0.6 mL / L hydrogen peroxide solution were added, the knitted nylon-spandex fabric was immersed therein, treated at room temperature for 30 min, washed with deionized water, and placed in a 60°C environment for vacuum drying for 12 h to obtain a modified knitted nylon-spandex fabric;

[0052] S5: Add silver nitride to deionized water, add ammonia water until the solution is transparent, immerse the modified knitted nylon-spandex fabric therein, add 12 g / L glucose solution, react at room temperature for 30 min, wash with deionized water, place in a 60°C environment and vacuum dry for 12 h to obtain the original yarn cool knitted nylon-spandex fabric.

[0053] Experiment: The nylon-spandex fabrics prepared in the examples and comparative examples have a gram weight of 150 g / m 2 .

[0054] Antibacterial performance test: The antibacterial properties of the nylon-spandex fabrics prepared in the examples and comparative examples were tested according to GB / T 20944.3-2008.

[0055] The experimental results are shown in Table 1 below.

[0056] Cooling performance test: test temperature 34.5±0.2℃, RH27±3%, place the nylon-spandex fabrics prepared in the examples and comparative examples on the surface of the instrument, and within the first 0.2 seconds, use the test instrument to measure the heat transfer value close to the skin surface.

[0057] The experimental results are shown in Table 2 below.

[0058] Table 1 Antibacterial performance test data of nylon-spandex fabrics

[0059]

[0060] Table 2 Cooling performance test data of nylon-spandex fabrics

[0061]

[0062] Conclusion: The cool knitted nylon-spandex fabric prepared by the present invention has excellent antibacterial and contact cool properties, and also has excellent water washability, which can meet people's needs for repeated washing during summer wear.

[0063] In Comparative Example 1, due to the different deposition methods of nanosilver, the nanosilver loading on the fabric surface is reduced, the firmness of the nanosilver on the fabric surface is reduced, and the water resistance is reduced.

[0064] Comparative Example 2 lacks glutaraldehyde atmosphere treatment during the preparation process, resulting in reduced adhesion between different nanofibers and reduced water wash resistance.

[0065] In Comparative Example 3, nylon nanofibers are directly used to directly cover spandex nanofibers without modification, resulting in reduced adhesion between different nanofibers and reduced water wash resistance.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A method for preparing a raw yarn cool knitted nylon-spandex fabric, characterized in that: The following steps are involved: S1: adding chitosan to a mixed solution of trifluoroacetic acid and dichloromethane, stirring at room temperature for 4-5 hours, adding polyurethane particles, TiO2 nanoparticle dispersion, and modified spandex spinning solution, stirring evenly, to obtain a spandex core layer spinning solution; electrospinning the spandex core layer spinning solution according to set parameters to obtain spandex core layer nanofibers; S2: Add nylon nanofibers to tetrahydrofuran, add 1M borane tetrahydrofuran solution under nitrogen atmosphere and ice bath condition, stir at room temperature for 1-1.5h, heat to 50-55℃ for reaction for 10-11h, cool to room temperature, add methanol for quenching, wash nylon nanofibers with tetrahydrofuran, 1M hydrochloric acid solution, deionized water, 1M sodium hydroxide solution, deionized water, ethanol and acetone in sequence, place in 60-65℃ environment and vacuum dry for 10-12h to obtain nylon skin nanofibers; S3: Passing the spandex core layer nanofibers through a glutaraldehyde aqueous solution bath to form a coating, winding and coating the nylon skin layer nanofibers on the surface of the coating, and drying at room temperature to obtain nylon-spandex composite yarns; weaving the nylon-spandex composite yarns into cloth to obtain knitted nylon-spandex fabrics; post-treating the knitted nylon-spandex fabrics with nano-silver deposition to obtain original yarn cool knitted nylon-spandex fabrics.

2. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 1, characterized in that: The preparation method of the modified spandex spinning solution comprises the following steps: adding polytetramethylene ether glycol into a reaction container, heating to 90-92°C and vacuum drying for 2h, adding diphenylmethane diisocyanate preheated to 70-72°C, keeping the temperature at 90-92°C under vacuum conditions to react until the theoretical NCO value is reached, adding N,N-dimethylacetamide, stirring evenly, adding a dimethyl sulfoxide solution of polyhexamethyleneguanidine hydrochloride, keeping the temperature at 90-92°C and reacting for 20-25min, and obtaining the modified spandex spinning solution.

3. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 2, characterized in that: In the preparation process of the modified spandex spinning solution, the molar ratio of polytetramethylene ether glycol: diphenylmethane diisocyanate: polyhexamethyleneguanidine hydrochloride is (0.061-0.072):(0.1165-0.1168):0.0555.

4. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 2, characterized in that: The preparation method of polyhexamethyleneguanidine hydrochloride comprises the following steps: adding guanidine hydrochloride and 1 / 3 of hexamethylenediamine into a reaction container, heating to 120-125° C. for reaction for 3-3.5 hours, adding the remaining 2 / 3 of hexamethylenediamine, heating to 140-145° C. for reaction for 8-8.5 hours, placing the product in an environment of 85-87° C. for vacuum drying for 48 hours, and obtaining polyhexamethyleneguanidine hydrochloride.

5. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 4, characterized in that: In the preparation process of polyhexamethyleneguanidine hydrochloride, the molar ratio of guanidine hydrochloride to hexamethylenediamine is 1:

1.

6. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 1, characterized in that: In the process of preparing the spandex core spinning solution, the mass ratio of polyurethane particles: chitosan: modified spandex spinning solution is (85-95): (5-15): (0.5-1); the TiO2 nanoparticle dispersion is obtained by ultrasonically dispersing TiO2 nanoparticles in N,N-dimethylformamide, and the amount of TiO2 nanoparticles added is 1-1.5wt% of the mass of the polyurethane particles; The concentration of the spandex core layer spinning solution is 15-16 w / v%. During the preparation of the spandex core layer nanofibers, the electrospinning parameters include: applied voltage 14.5-17 kV, distance from needle tip to collector 14-22 cm, and spinning solution flow rate 0.5-0.7 mL / h.

7. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 1, characterized in that: The nanosilver deposition post-treatment process comprises the following steps: step (1): adding dopamine hydrochloride into deionized water, adding Tris to adjust the pH value of the solution to 8.5, adding copper sulfate pentahydrate solution and hydrogen peroxide solution, immersing the knitted nylon-spandex fabric therein, treating at room temperature for 30-45 minutes, washing with deionized water, placing in a 60-65°C environment and vacuum drying for 12-16 hours, and obtaining a modified knitted nylon-spandex fabric; Step (2): Add silver nitride to deionized water, add ammonia water until the solution is transparent, immerse the modified knitted nylon-spandex fabric therein, add glucose solution, react at room temperature for 30-45 minutes, wash with deionized water, expose to glutaraldehyde atmosphere for 24 hours, place in a 60-65°C environment and vacuum dry for 12-24 hours to obtain a cool knitted nylon-spandex fabric.

8. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 7, characterized in that: During the preparation of the modified knitted nylon-spandex fabric, the concentration of the copper sulfate pentahydrate solution is 1.8-2 g / L, and the concentration of the hydrogen peroxide solution is 0.6 ml / L.

9. The method for preparing a raw yarn cool knitted nylon-spandex fabric according to claim 1, characterized in that: During the preparation of the nylon-spandex composite yarn, the concentration of the glutaraldehyde aqueous solution is 17-20wt%.

10. The raw yarn cool feeling knitted nylon-spandex fabric prepared by the method for preparing raw yarn cool feeling knitted nylon-spandex fabric according to claims 1-9.

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