Moisture-absorbing and heating warm-keeping knitted fabric and preparation method thereof

Abstract

The invention belongs to the technical field of knitted fabrics, and particularly relates to a moisture-absorbing and heating warm-keeping knitted fabric and a preparation method thereof. The preparation method of the fabric comprises the following steps: preparing a composite modifier by taking alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotubes, glycidyl methacrylate and hydroxyethyl acrylate as raw materials; reacting the composite modifier with the amino-modified PET to prepare modified PET; melting the modified PET to obtain a melt, spraying the melt through a special-shaped spinneret orifice, cooling, drafting and chopping to obtain PET fibers; and spinning the PET fibers into yarns, and spinning the yarns into the fabric through a knitting process to obtain the moisture-absorbing and heat-generating warm-keeping knitted fabric. By adding the composite modifier, the moisture absorption performance and the heating performance of the fabric can be effectively improved, and the fabric is good in warm keeping effect and has good antistatic performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of knitted fabric, and particularly relates to a moisture-absorbing and heat-generating warm knitted fabric and a preparation method thereof. BACKGROUND

[0002] With the development of the textile industry, consumers have higher and higher requirements for cloth. The knitted fabric made of polyester fiber has the advantages of leisure fashion, elasticity, wrinkle resistance, shape retention and the like, and is favored by consumers. However, the polyester fabric has the disadvantage of poor moisture absorption, and the warmth retention of the polyester fabric also needs to be improved.

[0003] Chinese patent CN103382618B discloses a three-dimensional warm knitted fabric, which comprises an outer layer, an inner layer and connecting filaments. The outer layer is composed of fine denier polyester fiber, and the inner layer is composed of profiled cross-section fiber. The connecting filaments are polyester filaments. The fabric is knitted by using a needle disc and a needle cylinder to be separately knitted, so that the fabric has good compactness, and thus has the characteristics of thick appearance and good warmth retention. The warmth retention is improved by relying on high compactness, which easily aggravates the problem of poor moisture absorption and sweat release of the polyester fabric, and the antistatic property of the polyester fabric also needs to be improved. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a moisture-absorbing and heat-generating warm knitted fabric to solve the problems of poor warmth retention, moisture absorption and antistatic property of the polyester fabric in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a preparation method of a moisture-absorbing and heat-generating warm knitted fabric, comprising the following steps: Step one, preparing a composite modifier by using alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotube, glycidyl methacrylate and hydroxyethyl acrylate as raw materials; Step two, reacting the composite modifier with amino-modified PET to obtain modified PET; Step three, melting the modified PET to obtain a melt, which is sprayed out through a profiled spinneret hole, cooled, drawn, and cut to obtain PET fiber; Step four, spinning the PET fiber into yarn, and spinning the yarn into fabric by a knitting process to obtain the moisture-absorbing and heat-generating warm knitted fabric.

[0006] Preferably, the step one specifically comprises: S11, adding alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotube, glycidyl methacrylate and hydroxyethyl acrylate into an organic solvent, stirring and mixing to obtain a mixture; S12, adding a first part of initiator to the mixture, reacting, after the reaction is completed, adding a second part of initiator, continuing to react, after the reaction is completed, adding a third part of initiator, reacting again, after the reaction is completed, rotary evaporation, to obtain the composite modifier.

[0007] Preferably, in the S11, the mass ratio of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate is (20-30):(15-25):(30-40):(35-45); the amount of the organic solvent added is 3-5 times the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate; and the organic solvent includes ethyl acetate.

[0008] Preferably, in the S12, the first part of initiator accounts for 0.1%-0.2% of the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate, the reaction condition is refluxing at a temperature of 60-70℃ for 2-3h in a protective gas atmosphere; the second part of initiator accounts for 0.15%-0.25% of the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate, the condition for continuing to react is refluxing at a temperature of 70-80℃ for 2-3h in a protective gas atmosphere; the third part of initiator accounts for 0.3%-0.4% of the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate, the condition for reacting again is refluxing at a temperature of 75-85℃ for 2-3h in a protective gas atmosphere; and the initiator includes azobisisobutyronitrile.

[0009] Preferably, the alkenyl-modified polypyrrole / montmorillonite is prepared by the following steps: S21, dispersing montmorillonite in deionized water, stirring, standing, to obtain a montmorillonite suspension; S22, adding ferric chloride and sodium benzenesulfonate to the montmorillonite suspension, stirring, then adding pyrrole, reacting, after the reaction is completed, ultrasonicating, centrifuging, washing, and drying, to obtain a polypyrrole / montmorillonite; S23, adding γ-methacryloyloxypropyltrimethoxysilane (silane coupling agent KH-570) to an aqueous ethanol solution, adjusting the pH value to 3.5-4.5, stirring, then adding the polypyrrole / montmorillonite, reacting, after the reaction is completed, centrifuging, washing, and drying, to obtain the alkenyl-modified polypyrrole / montmorillonite.

[0010] Preferably, in the S21, the mass ratio of the montmorillonite to the deionized water is (0.3-0.5):100.

[0011] Preferably, in the S22, the mass ratio of the ferric chloride, the sodium benzenesulfonate, the montmorillonite suspension, and the pyrrole is (8.9-9.3):(4.2-4.6):(100.3-100.5):(0.8-1), the reaction condition is that the reaction is carried out at room temperature for 10-15 hours under nitrogen protection.

[0012] Preferably, in the S23, the mass ratio of the γ-methacryloyloxypropyltrimethoxysilane, the aqueous ethanol solution, and the polypyrrole / montmorillonite is (6-8):(150-250):10, the stirring condition is that the stirring is carried out at room temperature for 3-5 hours, and the reaction condition is that the reaction is carried out at a temperature of 65-75 °C by reflux for 20-30 hours.

[0013] Preferably, the aqueous ethanol solution comprises a 90wt% aqueous ethanol solution.

[0014] Preferably, the alkenyl-modified carbon nanotube is prepared by the following steps: adding the acidified carbon nanotube and the γ-methacryloyloxypropyltrimethoxysilane into ethanol, ultrasonic dispersion, reaction, centrifugation, washing, and drying to obtain the alkenyl-modified carbon nanotube.

[0015] Preferably, the mass ratio of the acidified carbon nanotube, the γ-methacryloyloxypropyltrimethoxysilane, and the ethanol is 10:(8-12):(200-300), and the reaction condition is that the reaction is carried out by stirring reflux at a temperature of 100-120 °C for 4-6 hours.

[0016] Preferably, the acidified carbon nanotube is prepared by the following steps: adding the carbon nanotube into mixed acid, ultrasonic dispersion, reaction, centrifugation, washing, and drying to obtain the acidified carbon nanotube; wherein the mass ratio of the carbon nanotube and the mixed acid is 1:(5-10), and the reaction condition is that the reaction is carried out by reflux at a temperature of 115-125 °C for 2.5-3.5 hours; the mixed acid is prepared by mixing concentrated sulfuric acid and concentrated nitric acid at a volume ratio of 3:1, the concentrated sulfuric acid is a 95wt% aqueous sulfuric acid solution, and the concentrated nitric acid is a 65wt% aqueous nitric acid solution.

[0017] Preferably, the step two specifically comprises: S31, placing the powdered PET resin into a nitric acid solution, heating reaction, after the reaction is completed, filtering, washing, and drying to obtain nitrated PET; S32, adding the nitrated PET into a sodium sulfide-sodium carbonate mixed solution, reaction, after the reaction is completed, filtering, washing, and drying to obtain amino-modified PET; S33, mixing the complex modifier with the amino-modified PET, melt reaction, extrusion, cooling, and pelletizing to obtain modified PET.

[0018] Preferably, in the step S31, the mass ratio of the powdered PET resin to the nitric acid solution is 1:(25-35), and the heating reaction is carried out at a temperature of 75-85 DEG C for 30-50 min; the concentration of the nitric acid solution is 25-35 g / L.

[0019] Preferably, in the step S32, the mass ratio of the nitrated PET to the sodium sulfide-sodium carbonate mixed solution is 1:(90-110), and the reaction is carried out at a temperature of 95-105 DEG C for 25-35 min; in the sodium sulfide-sodium carbonate mixed solution, the concentration of the sodium sulfide is 20-30 g / L, and the concentration of the sodium carbonate is 15-25 g / L.

[0020] Preferably, in the step S33, the mass ratio of the composite modifier to the amino-modified PET is (6-10):100, and the melting reaction is carried out at a temperature of 270-290 DEG C.

[0021] Preferably, in the step three, the melting temperature is 270-290 DEG C, and the draw ratio is 3-5 times.

[0022] Preferably, in the step four, the yarn count of the yarn is 30-50 S (English count), and the gram weight of the moisture-absorbing and heat-generating thermal knit fabric is 180-220 g / m 2 .

[0023] The application further provides a moisture-absorbing and heat-generating thermal knit fabric prepared by the above method.

[0024] Compared with the prior art, the application has the advantages that: in the application, polyester is used as a base to prepare fibers, the fibers are spun into yarns, and the yarns are knitted into a fabric through a knitting process, the elasticity and wrinkle-resistant shape retention of the knitted fabric are good, the loops of the knitted fabric are intertwined with each other, a large number of isolated air bags are formed in the fabric, the fabric has good warmth retention and air permeability; in the application, alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotubes, glycidyl methacrylate and hydroxyethyl acrylate are used as raw materials to prepare a composite modifier, polypyrrole and carbon nanotubes both have good light-heat conversion functions, can absorb external solar radiation energy and convert it into heat energy, and make the fabric have light absorption and heat generation performance, so that the body temperature can be raised by using sunlight and the warmth retention of the fabric is enhanced; in the application, PET is subjected to nitration and reduction reactions, and a polar group, i.e., an amino group, is introduced, the hydrophilicity of the amino group is enhanced, and the moisture absorption of the PET can be effectively improved, in the preparation of the composite modifier, the montmorillonite has strong hydrophilicity and the hydrophilic groups, i.e., hydroxyl groups, introduced in the hydroxyethyl acrylate molecules, can both effectively improve the moisture absorption of the fabric, the epoxy groups introduced in the composite modifier react with the amino-modified PET, the chemical bonding between the composite modifier and the PET can be achieved, the compatibility between the composite modifier and the PET is improved, the epoxy groups react with the amino groups to generate hydroxyl groups, which is equivalent to the hydrophilic effect of the amino groups being replaced by the hydroxyl groups, and the hydrophilicity will not decrease due to the consumption of the hydrophilic groups by the reaction, the PET fiber is a profiled cross-section fiber, the capillary effect generated by the longitudinal grooves of the profiled cross-section fiber can quickly guide, diffuse and evaporate sweat, and the moisture absorption and perspiration performance of the fabric can be improved; in the application, PET is subjected to nitration and reduction reactions, and a hydrophilic group, i.e., an amino group, is introduced, and the hydrophilic groups, i.e., hydroxyl groups, are introduced when the amino-modified PET reacts with the composite modifier, the hydrophilic groups can capture water vapor in the atmosphere, the hydrophilic groups and the water vapor are combined in a hydrogen bond mode to be static, kinetic energy is converted into heat energy, and the temperature of the fabric is raised, so that the fabric can be endowed with moisture absorption and heat generation performance; in the application, the hydrophilic components (montmorillonite) and the hydrophilic groups (amino groups and hydroxyl groups) are introduced, the moisture absorption of the fabric can be improved, and the antistatic property of the PET is improved, meanwhile, the polypyrrole and the carbon nanotubes introduced both have good conductivity, and the antistatic property of the fabric can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 1 is a moisture absorption and perspiration performance test result diagram of the fabric prepared in the application examples 1-3 and the comparative examples 1-5; Figure 2 Fig. 2 is a moisture absorption and heat generation performance test result diagram of the fabric prepared in the application examples 1-3 and the comparative examples 1-5; Figure 3 Fig. 3 is a light absorption and heat generation performance test result diagram of the fabric prepared in the application examples 1-3 and the comparative examples 1-5; Figure 4The anti-static property test results of the fabric prepared in Examples 1-3 and Comparative Examples 1-5 of the present application are shown in the following table. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0027] Example 1 The present embodiment discloses a preparation method of a moisture-absorbing and heat-generating warm-keeping knitted fabric, comprising the following steps: Step one, preparation of composite modifier; specifically includes the following steps: S11, the alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is added in ethyl acetate, stirring mixing 40min under the speed of 300r / min, get the mixture; wherein, the mass ratio of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is 20:15:30:35, the amount of ethyl acetate is 3 times of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; S12, the first part of azobisisobutyronitrile is added to the mixture, under the atmosphere of nitrogen, reflux reaction at 60 DEG C for 3h, after the reaction is completed, the second part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 70 DEG C for 3h, after the reaction is completed, the third part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 75 DEG C for 3h, after the reaction is completed, the dissolved ethyl acetate is removed by rotary evaporation at 60 DEG C temperature, the composite modifier is obtained; wherein, the first part of azobisisobutyronitrile accounts for 0.1% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the second part of azobisisobutyronitrile accounts for 0.15% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the third part of azobisisobutyronitrile accounts for 0.4% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; the alkenyl modified polypyrrole / montmorillonite is prepared by the following steps: S21, the montmorillonite is dispersed in deionized water, the mass ratio of montmorillonite to deionized water is 0.3:100, stirring at the speed of 100r / min for 1h, standing for 12h, obtaining the montmorillonite suspension; S22, the ferric chloride, sodium benzenesulfonate is added to the montmorillonite suspension, after stirring at the speed of 100r / min for 30min, the pyrrole is added, the mass ratio of ferric chloride, sodium benzenesulfonate, montmorillonite suspension, pyrrole is 8.9:4.2:100.3:0.8, under the protection of nitrogen, reaction at room temperature for 10h, after the reaction is completed, ultrasonic dispersion for 30min under the frequency of 50kHz, centrifugal, washed with deionized water for 3 times, placed in 60 DEG C vacuum drying oven for drying for 24h, obtaining the polypyrrole / montmorillonite; S23, the γ-methacryloyloxypropyl trimethoxysilane is added in 90wt% ethanol aqueous solution, the pH value is adjusted to 3 with acetic acid.5, after stirring for 3h at room temperature, adding polypyrrole / montmorillonite, γ-methacryloxypropyltrimethoxysilane, 90wt% aqueous solution, the mass ratio of polypyrrole / montmorillonite / 90wt% aqueous solution is 6:150:10, refluxing at 65℃ for 30h, after the reaction is completed, centrifuging, washing with deionized water and ethanol for 3 times respectively, drying in a vacuum drying oven at 60℃ for 24h, obtaining alkenyl-modified polypyrrole / montmorillonite; the alkenyl-modified carbon nanotube is prepared by the following steps: adding carbon nanotube into mixed acid, the mass ratio of carbon nanotube / mixed acid is 1:5, ultrasonic dispersing at 50kHz for 30min, refluxing at 115℃ for 3.5h, after the reaction is completed, centrifuging, washing with deionized water for 5 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining acidified carbon nanotube; the mixed acid is prepared by mixing concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, the concentrated sulfuric acid is 95wt% aqueous solution of sulfuric acid, and the concentrated nitric acid is 65wt% aqueous solution of nitric acid; adding acidified carbon nanotube and γ-methacryloxypropyltrimethoxysilane into ethanol, the mass ratio of acidified carbon nanotube / γ-methacryloxypropyltrimethoxysilane / ethanol is 10:8:200, ultrasonic dispersing at 50kHz for 30min, refluxing and stirring at 100℃ for 6h, after the reaction is completed, centrifuging, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining alkenyl-modified carbon nanotube. Step two, preparing modified PET; specifically including the following steps: S31, placing powdered PET resin into 35g / L nitric acid solution, the mass ratio of powdered PET resin / 35g / L nitric acid solution is 1:25, reacting at 75℃ for 50min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining nitrated PET; S32, adding nitrated PET into sodium sulfide-sodium carbonate mixed solution, the mass ratio of nitrated PET / sodium sulfide-sodium carbonate mixed solution is 1:90, reacting at 95℃ for 35min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining amino-modified PET; wherein, in the sodium sulfide-sodium carbonate mixed solution, the concentration of sodium sulfide is 30g / L, and the concentration of sodium carbonate is 25g / L; S33, mixing composite modifier with amino-modified PET, the mass ratio of composite modifier / amino-modified PET is 6:100, melt-reaction, the temperature of melt-reaction is 270℃, extruding, cooling, pelletizing, obtaining modified PET; Step three, melting modified PET to obtain melt, the melt is extruded through special-shaped spinneret hole, the temperature of melting is 270℃, the shape of cross section of special-shaped spinneret hole is cross shape, cooling, drawing, the draw ratio is 4 times, chopping, obtaining PET fiber; the fineness of PET fiber is 1.5dtex, and the average length of PET fiber is 38mm. Step four, the PET fibers are spun into yarns, the yarn count of the yarns is 40S, the yarns are spun into a fabric through a knitting process, and a moisture-absorbing and heat-generating thermal knitted fabric is obtained, the fabric has a grammage of 200 g / m 2 .

[0028] Embodiment 2 The embodiment discloses a preparation method of a moisture-absorbing and heat-generating thermal knitted fabric, comprising the following steps: Step one, preparation of composite modifier; specifically includes the following steps: S11, the alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is added in ethyl acetate, stirring mixing 20 min under the speed of 500 r / min, get the mixture; wherein, the mass ratio of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is 30:25:40:45, the amount of ethyl acetate is 5 times of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; S12, the first part of azobisisobutyronitrile is added to the mixture, under the atmosphere of nitrogen, reflux reaction at 70 DEG C for 2h, after the reaction is completed, the second part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 80 DEG C for 2h, after the reaction is completed, the third part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 85 DEG C for 2h, after the reaction is completed, the dissolved ethyl acetate is removed by rotary evaporation at 60 DEG C temperature, the composite modifier is obtained; wherein, the first part of azobisisobutyronitrile accounts for 0.2% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the second part of azobisisobutyronitrile accounts for 0.25% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the third part of azobisisobutyronitrile accounts for 0.3% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; The alkenyl modified polypyrrole / montmorillonite is prepared by the following steps: S21, the montmorillonite is dispersed in deionized water, the mass ratio of montmorillonite to deionized water is 0.5:100, stirring at the speed of 100 r / min for 1h, standing for 12h, obtaining the montmorillonite suspension; S22, the ferric chloride, sodium benzenesulfonate is added to the montmorillonite suspension, after stirring at the speed of 100 r / min for 30 min, the pyrrole is added, the mass ratio of ferric chloride, sodium benzenesulfonate, montmorillonite suspension, pyrrole is 9.3:4.6:100.5:0.1, under the protection of nitrogen, reaction at room temperature for 15h, after the reaction is completed, ultrasonic dispersion for 30 min under the frequency of 50 kHz, centrifugal, washed with deionized water for 3 times, placed in 60 DEG C vacuum drying oven for drying 24h, obtaining the polypyrrole / montmorillonite; S23, the γ-methacryloyloxypropyl trimethoxysilane is added in 90wt% ethanol aqueous solution, the pH value is adjusted to 4 with acetic acid.5, after stirring for 5h at room temperature, adding polypyrrole / montmorillonite, γ-methacryloxypropyltrimethoxysilane, 90wt% aqueous solution of ethanol, the mass ratio of polypyrrole / montmorillonite / γ-methacryloxypropyltrimethoxysilane / 90wt% aqueous solution of ethanol is 8:250:10, refluxing at 75℃ for 20h, after the reaction is completed, centrifuging, washing with deionized water and ethanol for 3 times respectively, drying in a vacuum drying oven at 60℃ for 24h, obtaining the alkenyl-modified polypyrrole / montmorillonite; the alkenyl-modified carbon nanotube is prepared by the following steps: adding carbon nanotubes into mixed acid, the mass ratio of carbon nanotubes / mixed acid is 1:10, ultrasonic dispersing at 50kHz for 30min, refluxing at 125℃ for 2.5h, after the reaction is completed, centrifuging, washing with deionized water for 5 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining acidified carbon nanotubes; the mixed acid is prepared by mixing concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, the concentrated sulfuric acid is 95wt% aqueous solution of sulfuric acid, and the concentrated nitric acid is 65wt% aqueous solution of nitric acid; adding acidified carbon nanotubes and γ-methacryloxypropyltrimethoxysilane into ethanol, the mass ratio of acidified carbon nanotubes / γ-methacryloxypropyltrimethoxysilane / ethanol is 10:12:300, ultrasonic dispersing at 50kHz for 30min, refluxing at 120℃ for 4h, after the reaction is completed, centrifuging, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining the alkenyl-modified carbon nanotube. Step two, preparing modified PET; specifically including the following steps: S31, placing powdered PET resin into 25g / L nitric acid solution, the mass ratio of powdered PET resin / 25g / L nitric acid solution is 1:35, reacting at 85℃ for 30min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining nitrated PET; S32, adding nitrated PET into sodium sulfide-sodium carbonate mixed solution, the mass ratio of nitrated PET / sodium sulfide-sodium carbonate mixed solution is 1:110, reacting at 105℃ for 25min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining amino-modified PET; wherein, in the sodium sulfide-sodium carbonate mixed solution, the concentration of sodium sulfide is 20g / L, and the concentration of sodium carbonate is 15g / L; S33, mixing composite modifier with amino-modified PET, the mass ratio of composite modifier / amino-modified PET is 10:100, melt-reaction, the temperature of melt-reaction is 290℃, extruding, cooling, pelletizing, obtaining modified PET; Step three, melting modified PET to obtain melt, the melt is extruded through special-shaped spinneret, the temperature of melting is 290℃, the shape of the cross section of the special-shaped spinneret is cross shape, cooling, drawing, the draw ratio is 4 times, chopping, obtaining PET fiber; the fineness of PET fiber is 1.5dtex, and the average length of PET fiber is 38mm. Step four, the PET fiber is spun into a yarn, the yarn count of the yarn is 40S, the yarn is spun into a fabric through a knitting process, and a moisture-absorbing and heat-releasing warm knitted fabric is obtained, the grammage of the moisture-absorbing and heat-releasing warm knitted fabric is 200g / m 2 .

[0029] Example 3 The embodiment discloses a preparation method of a moisture-absorbing and heat-releasing warm knitted fabric, comprising the following steps: Step one, a composite modifier is prepared; specifically comprising the following steps: S11, alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate and hydroxyethyl acrylate are added into ethyl acetate, and stirring and mixing are carried out at a speed of 500 r / min for 20 min, so as to obtain a mixture; The mass ratio of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate is 25:20:35:40, and the adding amount of the ethyl acetate is 4 times of the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate; S12, a first part of azobisisobutyronitrile is added to the mixture, and reflux reaction is carried out under a nitrogen atmosphere at a temperature of 65 DEG C for 2.5h, after the reaction is completed, a second part of azobisisobutyronitrile is added, and reflux reaction is carried out under a nitrogen atmosphere at a temperature of 75 DEG C for 2.5h, after the reaction is completed, a third part of azobisisobutyronitrile is added, and reflux reaction is carried out under a nitrogen atmosphere at a temperature of 80 DEG C for 2.5h, after the reaction is completed, the dissolved ethyl acetate is removed by rotary evaporation at a temperature of 60 DEG C, and a composite modifier is obtained; wherein the first part of azobisisobutyronitrile accounts for 0.15% of the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate, the second part of azobisisobutyronitrile accounts for 0.2% of the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate, and the third part of azobisisobutyronitrile accounts for 0.35% of the total mass of the alkenyl-modified polypyrrole / montmorillonite, the alkenyl-modified carbon nanotube, the glycidyl methacrylate, and the hydroxyethyl acrylate; the alkenyl-modified polypyrrole / montmorillonite is prepared by the following steps: S21, montmorillonite is dispersed in deionized water, the mass ratio of the montmorillonite to the deionized water is 0.4:100, stirring is carried out at a speed of 100r / min for 1h, and standing is carried out for 12h, and a montmorillonite suspension is obtained; S22, ferric chloride and sodium benzenesulfonate are added to the montmorillonite suspension, stirring is carried out at a speed of 100r / min for 30min, and then pyrrole is added, and the mass ratio of the ferric chloride, the sodium benzenesulfonate, the montmorillonite suspension, and the pyrrole is 9.1:4.4:100.4:0.9, under nitrogen protection, reacting for 12h at room temperature, after the reaction, ultrasonic dispersion for 30min under 50kHz frequency, centrifugation, washing with deionized water for 3 times, drying in a vacuum drying box at 60℃ for 24h, to obtain polypyrrole / montmorillonite; S23, adding γ-methacryloyloxypropyl trimethoxysilane into 90wt% ethanol aqueous solution, adjusting pH value to 4 with acetic acid, after stirring for 4h at room temperature, adding polypyrrole / montmorillonite, the mass ratio of γ-methacryloyloxypropyl trimethoxysilane, 90wt% ethanol aqueous solution, polypyrrole / montmorillonite is 7:200:10, refluxing for 25h at 70℃, after the reaction, centrifugation, washing with deionized water and ethanol for 3 times respectively, drying in a vacuum drying box at 60℃ for 24h, to obtain alkenyl modified polypyrrole / montmorillonite; the alkenyl modified carbon nanotube is prepared by the following steps: adding carbon nanotube into mixed acid, the mass ratio of carbon nanotube and mixed acid is 1:8, after ultrasonic dispersion for 30min under 50kHz frequency, refluxing for 3h at 120℃, after the reaction, centrifugation, washing with deionized water for 5 times, drying in a vacuum drying box at 60℃ for 24h, to obtain acidified carbon nanotube; the mixed acid is prepared by mixing concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, the concentrated sulfuric acid is 95wt% sulfuric acid aqueous solution, the concentrated nitric acid is 65wt% nitric acid aqueous solution; adding acidified carbon nanotube and γ-methacryloyloxypropyl trimethoxysilane into ethanol, the mass ratio of acidified carbon nanotube, γ-methacryloyloxypropyl trimethoxysilane and ethanol is 10:10:250, after ultrasonic dispersion for 30min under 50kHz frequency, stirring and refluxing for 5h at 110℃, after the reaction, centrifugation, washing with deionized water for 3 times, drying in a vacuum drying box at 60℃ for 24h, to obtain alkenyl modified carbon nanotube. Step two, preparing modified PET; specifically including the following steps: S31, placing powdered PET resin into 30g / L nitric acid solution, the mass ratio of powdered PET resin and 30g / L nitric acid solution is 1:30, reacting for 40min at 80℃, after the reaction, filtration, washing with deionized water for 3 times, drying in a vacuum drying box at 60℃ for 24h, to obtain nitrated PET; S32, adding nitrated PET into sodium sulfide-sodium carbonate mixed solution, the mass ratio of nitrated PET and sodium sulfide-sodium carbonate mixed solution is 1:100, reacting for 30min at 100℃, after the reaction, filtration, washing with deionized water for 3 times, drying in a vacuum drying box at 60℃ for 24h, to obtain amino modified PET; wherein, in the sodium sulfide-sodium carbonate mixed solution, the concentration of sodium sulfide is 25g / L, the concentration of sodium carbonate is 20g / L; S33, mixing composite modifier with amino modified PET, the mass ratio of composite modifier and amino modified PET is 8:100, melt reaction, the temperature of melt reaction is 280℃, extrusion, cooling, granulation, to obtain modified PET; Step three, melt the modified PET to obtain a melt, the melt is extruded through a shaped spinneret, the temperature of the melt is 280℃, the shape of the cross section of the shaped spinneret is cross-shaped, cooling, drawing, the draw ratio is 4 times, cutting, to obtain a PET fiber; the fineness of the PET fiber is 1.5dtex, and the average length of the PET fiber is 38mm; Step four, spinning the PET fiber into a yarn, the yarn count of the yarn is 40S, spinning the yarn into a fabric through a knitting process, to obtain a moisture-absorbing and heat-generating thermal knitted fabric, the grammage of the moisture-absorbing and heat-generating thermal knitted fabric is 200g / m 2 .

[0030] Comparative Example 1 The present comparative example discloses a preparation method of a moisture-absorbing and heat-generating thermal knitted fabric, comprising the following steps: Step one, preparation of composite modifier; specifically includes the following steps: S11, the alkenyl modified montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is added in ethyl acetate, stirring mixing at 300r / min speed 40min, get mixture;Wherein, the mass ratio of alkenyl modified montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is 11.8:15:30:35, the amount of ethyl acetate is 3 times of the total mass of alkenyl modified montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate;S12, the first part of azobisisobutyronitrile is added to the mixture, under the atmosphere of nitrogen, at the temperature of 60℃, reflux reaction 3h, after the reaction is completed, the second part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, at the temperature of 70℃, reflux reaction 3h, after the reaction is completed, the third part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, at the temperature of 75℃, reflux reaction 3h, after the reaction is completed, the dissolved ethyl acetate is removed by rotary evaporation at the temperature of 60℃, to obtain the composite modifier;Wherein, the first part of azobisisobutyronitrile accounts for 0.1% of the total mass of alkenyl modified montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the second part of azobisisobutyronitrile accounts for 0.15% of the total mass of alkenyl modified montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the third part of azobisisobutyronitrile accounts for 0.4% of the total mass of alkenyl modified montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate;The alkenyl modified montmorillonite is prepared by the following steps: γ-methacryloxypropyl trimethoxysilane is added to 90wt% ethanol aqueous solution, the pH value is adjusted to 3.5 with acetic acid, after stirring at room temperature for 3h, montmorillonite is added, the mass ratio of γ-methacryloxypropyl trimethoxysilane, 90wt% ethanol aqueous solution, montmorillonite is 3.5:150:10, reflux reaction at 65℃ for 30h, after the reaction is completed, centrifugal, washed with deionized water and ethanol for 3 times respectively, placed in 60℃ vacuum drying oven for drying for 24h, to obtain the alkenyl modified montmorillonite;The alkenyl modified carbon nanotube is prepared by the following steps: carbon nanotube is added to mixed acid, the mass ratio of carbon nanotube and mixed acid is 1:5, after ultrasonic dispersion at 50kHz frequency for 30min, reflux reaction at 115℃ for 3h.5h, after the reaction is completed, centrifugal, washed with deionized water 5 times, placed in a vacuum drying oven at 60 DEG C drying 24h, after the acidification of carbon nanotubes; the mixed acid is concentrated sulfuric acid and concentrated nitric acid mixed in a volume ratio of 3:1, concentrated sulfuric acid is 95wt% sulfuric acid solution, concentrated nitric acid is 65wt% nitric acid solution; the acidification of carbon nanotubes, gamma-methacryloxy propyl trihydroxy silane, ethanol, the mass ratio of 10:8:200, ultrasonic dispersion at 50 kHz frequency for 30 min, stirring reflux reaction at 100 DEG C for 6h, after the reaction is completed, centrifugal, washed with deionized water 3 times, placed in a vacuum drying oven at 60 DEG C drying 24h, to get alkenyl modified carbon nanotubes. Step two, preparation of modified PET; specifically includes the following steps: S31, the powder of PET resin is placed in 35g / L nitric acid solution, the mass ratio of powder of PET resin and 35g / L nitric acid solution is 1:25, the reaction is carried out at 75 DEG C for 50 min, after the reaction is completed, filtration, washed with deionized water 3 times, placed in a vacuum drying oven at 60 DEG C drying 24h, to obtain nitrated PET; S32, the nitrated PET is added into sodium sulfide-sodium carbonate mixed solution, the mass ratio of nitrated PET and sodium sulfide-sodium carbonate mixed solution is 1:90, the reaction is carried out at 95 DEG C for 35 min, after the reaction is completed, filtration, washed with deionized water 3 times, placed in a vacuum drying oven at 60 DEG C drying 24h, to obtain amino modified PET; wherein, in the sodium sulfide-sodium carbonate mixed solution, the concentration of sodium sulfide is 30g / L, the concentration of sodium carbonate is 25g / L; S33, the composite modifier is mixed with the amino modified PET, the mass ratio of the composite modifier and the amino modified PET is 6:100, melt reaction, the temperature of melt reaction is 270 DEG C, extrusion, cooling, pelletizing, to obtain modified PET; Step three, the modified PET is melted to obtain a melt, the melt is sprayed out through a special-shaped spinneret hole, the temperature of melting is 270 DEG C, the shape of the cross section of the special-shaped spinneret hole is cross, cooling, drawing, the draw ratio is 4 times, chopping, to obtain PET fiber; the fineness of the PET fiber is 1.5dtex, the average length of the PET fiber is 38mm; Step four, the PET fiber is spun into yarn, the yarn count of the yarn is 40S, the yarn is spun into fabric through knitting process, to obtain moisture-absorbing and heat-generating warm knitted fabric, the grammage of the moisture-absorbing and heat-generating warm knitted fabric is 200g / m 2 .

[0031] Comparative example 2 The present comparative example discloses a preparation method of moisture-absorbing and heat-generating warm knitted fabric, comprising the following steps: Step one, preparation of composite modifier; specifically includes the following steps: S11, the alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is added in ethyl acetate, stirring mixing 40min under the speed of 300r / min, get the mixture; wherein, the mass ratio of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is 20:15:30:35, the amount of ethyl acetate is 3 times of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; S12, the first part of azobisisobutyronitrile is added to the mixture, under the atmosphere of nitrogen, reflux reaction at 60 DEG C for 3h, after the reaction is completed, the second part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 70 DEG C for 3h, after the reaction is completed, the third part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 75 DEG C for 3h, after the reaction is completed, the dissolved ethyl acetate is removed by rotary evaporation at 60 DEG C temperature, the composite modifier is obtained; wherein, the first part of azobisisobutyronitrile accounts for 0.1% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the second part of azobisisobutyronitrile accounts for 0.15% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the third part of azobisisobutyronitrile accounts for 0.4% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; The alkenyl modified polypyrrole / montmorillonite is prepared by the following steps: S21, the montmorillonite is dispersed in deionized water, the mass ratio of montmorillonite to deionized water is 0.3:100, stirring at the speed of 100r / min for 1h, standing for 12h, obtaining the montmorillonite suspension; S22, the ferric chloride, sodium benzenesulfonate is added to the montmorillonite suspension, after stirring at the speed of 100r / min for 30min, the pyrrole is added, the mass ratio of ferric chloride, sodium benzenesulfonate, montmorillonite suspension, pyrrole is 8.9:4.2:100.3:0.8, under the protection of nitrogen, reaction at room temperature for 10h, after the reaction is completed, ultrasonic dispersion for 30min under the frequency of 50kHz, centrifugal, washed with deionized water for 3 times, placed in 60 DEG C vacuum drying oven for drying 24h, obtaining the polypyrrole / montmorillonite; S23, the γ-methacryloyloxypropyl trimethoxysilane is added in 90wt% ethanol aqueous solution, the pH value is adjusted to 3 with acetic acid.5, after stirring for 3h at room temperature, adding polypyrrole / montmorillonite, γ-methacryloxypropyltrimethoxysilane, 90wt% aqueous solution of ethanol, the mass ratio of polypyrrole / montmorillonite / gamma-methacryloxypropyltrimethoxysilane / 90wt% aqueous solution of ethanol is 6:150:10, refluxing at 65℃ for 30h, after the reaction is completed, centrifuging, washing with deionized water and ethanol for 3 times respectively, drying in a vacuum drying oven at 60℃ for 24h, obtaining the alkenyl-modified polypyrrole / montmorillonite; the alkenyl-modified carbon nanotube is prepared by the following steps: adding carbon nanotubes into mixed acid, the mass ratio of carbon nanotubes and mixed acid is 1:5, ultrasonic dispersing at 50kHz for 30min, refluxing at 115℃ for 3.5h, after the reaction is completed, centrifuging, washing with deionized water for 5 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining acidified carbon nanotubes; the mixed acid is prepared by mixing concentrated sulfuric acid and concentrated nitric acid according to a volume ratio of 3:1, the concentrated sulfuric acid is 95wt% aqueous solution of sulfuric acid, and the concentrated nitric acid is 65wt% aqueous solution of nitric acid; adding acidified carbon nanotubes and gamma-methacryloxypropyltrimethoxysilane into ethanol, the mass ratio of acidified carbon nanotubes / gamma-methacryloxypropyltrimethoxysilane / ethanol is 10:8:200, ultrasonic dispersing at 50kHz for 30min, refluxing and stirring at 100℃ for 6h, after the reaction is completed, centrifuging, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining the alkenyl-modified carbon nanotube. Step two, preparing modified PET; specifically including the following steps: mixing the composite modifier with the powdered PET resin, the mass ratio of the composite modifier and the powdered PET resin is 6:100, melting and reacting, the temperature of the melting and reacting is 270℃, extruding, cooling, and pelletizing, obtaining the modified PET; Step three, melting the modified PET to obtain a melt, the melt is extruded through a special-shaped spinneret hole, the temperature of the melting is 270℃, the shape of the cross section of the special-shaped spinneret hole is cross-shaped, cooling, drawing, the draw ratio is 4 times, and cutting, obtaining the PET fiber; the fineness of the PET fiber is 1.5dtex, and the average length of the PET fiber is 38mm; Step four, spinning the PET fiber into yarn, the yarn count of the yarn is 40S, spinning the yarn into a fabric through a knitting process, obtaining the moisture-absorbing and heat-generating thermal knitted fabric, the grammage of the moisture-absorbing and heat-generating thermal knitted fabric is 200g / m 2 .

[0032] In the above examples and comparative examples, the length of the carbon nanotube is 5-15μm, the diameter of the carbon nanotube is 15-25nm, the average particle size of the montmorillonite is 2000 mesh, and the particle size of the powdered PET resin is 100-500 mesh.

[0033] Comparative example 3 The present comparative example discloses a preparation method of a moisture-absorbing and heat-generating warm-keeping knitted fabric, comprising the following steps: Step one, preparation of composite modifier; specifically includes the following steps: S11, the alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is added in ethyl acetate, stirring mixing 40min under the speed of 300r / min, get the mixture; wherein, the mass ratio of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is 20:15:30:35, the amount of ethyl acetate is 3 times of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; S12, the first part of azobisisobutyronitrile is added to the mixture, under the atmosphere of nitrogen, reflux reaction at 60 DEG C for 3h, after the reaction is completed, the second part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 70 DEG C for 3h, after the reaction is completed, the third part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 75 DEG C for 3h, after the reaction is completed, the dissolved ethyl acetate is removed by rotary evaporation at 60 DEG C temperature, the composite modifier is obtained; wherein, the first part of azobisisobutyronitrile accounts for 0.1% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the second part of azobisisobutyronitrile accounts for 0.15% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the third part of azobisisobutyronitrile accounts for 0.4% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; The alkenyl modified polypyrrole / montmorillonite is prepared by the following steps: S21, the montmorillonite is dispersed in deionized water, the mass ratio of montmorillonite to deionized water is 0.3:100, stirring at the speed of 100r / min for 1h, standing for 12h, obtaining the montmorillonite suspension; S22, the ferric chloride, sodium benzenesulfonate is added to the montmorillonite suspension, after stirring at the speed of 100r / min for 30min, the pyrrole is added, the mass ratio of ferric chloride, sodium benzenesulfonate, montmorillonite suspension, pyrrole is 8.9:4.2:100.3:0.8, under the protection of nitrogen, reaction at room temperature for 10h, after the reaction is completed, ultrasonic dispersion for 30min under the frequency of 50kHz, centrifugal, washed with deionized water for 3 times, placed in 60 DEG C vacuum drying oven for drying 24h, obtaining the polypyrrole / montmorillonite; S23, the γ-methacryloyloxypropyl trimethoxysilane is added in 90wt% ethanol aqueous solution, the pH value is adjusted to 3 with acetic acid.5, after stirring for 3h at room temperature, adding polypyrrole / montmorillonite, γ-methacryloxypropyltrimethoxysilane, 90wt% aqueous solution, the mass ratio of polypyrrole / montmorillonite / 90wt% aqueous solution is 6:150:10, refluxing at 65℃ for 30h, after the reaction is completed, centrifuging, washing with deionized water and ethanol for 3 times respectively, drying in a vacuum drying oven at 60℃ for 24h, obtaining alkenyl-modified polypyrrole / montmorillonite; the alkenyl-modified carbon nanotube is prepared by the following steps: adding carbon nanotube into mixed acid, the mass ratio of carbon nanotube / mixed acid is 1:5, ultrasonic dispersing at 50kHz for 30min, refluxing at 115℃ for 3.5h, after the reaction is completed, centrifuging, washing with deionized water for 5 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining acidified carbon nanotube; the mixed acid is prepared by mixing concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, the concentrated sulfuric acid is 95wt% aqueous solution of sulfuric acid, and the concentrated nitric acid is 65wt% aqueous solution of nitric acid; adding acidified carbon nanotube and γ-methacryloxypropyltrimethoxysilane into ethanol, the mass ratio of acidified carbon nanotube / γ-methacryloxypropyltrimethoxysilane / ethanol is 10:8:200, ultrasonic dispersing at 50kHz for 30min, refluxing and stirring at 100℃ for 6h, after the reaction is completed, centrifuging, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining alkenyl-modified carbon nanotube. Step two, preparing modified PET; specifically including the following steps: S31, placing powdered PET resin into 35g / L nitric acid solution, the mass ratio of powdered PET resin / 35g / L nitric acid solution is 1:25, reacting at 75℃ for 50min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining nitrated PET; S32, adding nitrated PET into sodium sulfide-sodium carbonate mixed solution, the mass ratio of nitrated PET / sodium sulfide-sodium carbonate mixed solution is 1:90, reacting at 95℃ for 35min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining amino-modified PET; wherein, in the sodium sulfide-sodium carbonate mixed solution, the concentration of sodium sulfide is 30g / L, and the concentration of sodium carbonate is 25g / L; S33, mixing composite modifier with amino-modified PET, the mass ratio of composite modifier / amino-modified PET is 3:100, melt-reaction, the temperature of melt-reaction is 270℃, extruding, cooling, pelletizing, obtaining modified PET; Step three, melting modified PET, obtaining melt, the melt is extruded through special-shaped spinneret hole, the temperature of melting is 270℃, the shape of cross section of special-shaped spinneret hole is cross shape, cooling, drawing, the draw ratio is 4 times, chopping, obtaining PET fiber; the fineness of PET fiber is 1.5dtex, and the average length of PET fiber is 38mm. Step four, the PET fibers are spun into yarns, the yarn count of the yarns is 40S, the yarns are spun into a fabric through a knitting process, and a moisture-absorbing and heat-generating thermal knitted fabric is obtained, the grammage of the moisture-absorbing and heat-generating thermal knitted fabric is 200 g / m 2 .

[0034] Comparative Example 4 The present comparative example discloses a preparation method of a moisture-absorbing and heat-generating thermal knitted fabric, comprising the following steps: Step one, preparation of composite modifier; specifically includes the following steps: S11, the alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is added in ethyl acetate, stirring mixing 40min under the speed of 300r / min, get the mixture; wherein, the mass ratio of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate is 15:10:30:25, the amount of ethyl acetate is 3 times of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; S12, the first part of azobisisobutyronitrile is added to the mixture, under the atmosphere of nitrogen, reflux reaction at 60 DEG C for 3h, after the reaction is completed, the second part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 70 DEG C for 3h, after the reaction is completed, the third part of azobisisobutyronitrile is added, under the atmosphere of nitrogen, reflux reaction at 75 DEG C for 3h, after the reaction is completed, the dissolved ethyl acetate is removed by rotary evaporation at 60 DEG C temperature, the composite modifier is obtained; wherein, the first part of azobisisobutyronitrile accounts for 0.1% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the second part of azobisisobutyronitrile accounts for 0.15% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate, the third part of azobisisobutyronitrile accounts for 0.4% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate; The alkenyl modified polypyrrole / montmorillonite is prepared by the following steps: S21, the montmorillonite is dispersed in deionized water, the mass ratio of montmorillonite to deionized water is 0.3:100, stirring at the speed of 100r / min for 1h, standing for 12h, obtaining the montmorillonite suspension; S22, the ferric chloride, sodium benzenesulfonate is added to the montmorillonite suspension, after stirring at the speed of 100r / min for 30min, the pyrrole is added, the mass ratio of ferric chloride, sodium benzenesulfonate, montmorillonite suspension, pyrrole is 8.9:4.2:100.3:0.8, under the protection of nitrogen, reaction at room temperature for 10h, after the reaction is completed, ultrasonic dispersion for 30min under the frequency of 50kHz, centrifugal, washed with deionized water for 3 times, placed in 60 DEG C vacuum drying oven for drying 24h, obtaining the polypyrrole / montmorillonite; S23, the γ-methacryloyloxypropyl trimethoxysilane is added in 90wt% ethanol aqueous solution, the pH value is adjusted to 3 with acetic acid.5. After stirring at room temperature for 3 hours, add polypyrrole / montmorillonite, γ-methacryloyloxypropyltrimethoxysilane, 90wt% ethanol aqueous solution, and polypyrrole / montmorillonite in a mass ratio of 6:150:10. Reflux at 65℃ for 30 hours. After the reaction, centrifuge, wash three times each with deionized water and ethanol, and dry in a vacuum drying oven at 60℃ for 24 hours to obtain alkenyl-modified polypyrrole / montmorillonite. The alkenyl-modified carbon nanotubes are prepared by the following steps: adding carbon nanotubes to mixed acid in a mass ratio of 1:5, ultrasonically dispersing at 50kHz for 30 minutes, refluxing at 115℃ for 3.5 hours, centrifuging, and washing with deionized water and ethanol. The carbon nanotubes were washed five times with water and dried in a vacuum drying oven at 60°C for 24 hours to obtain acidified carbon nanotubes. The mixed acid was a mixture of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1, with the concentrated sulfuric acid being a 95wt% sulfuric acid aqueous solution and the concentrated nitric acid being a 65wt% nitric acid aqueous solution. The acidified carbon nanotubes and γ-methacryloyloxypropyl were added to ethanol, with a mass ratio of acidified carbon nanotubes, γ-methacryloyloxypropyltrimethoxysilane, and ethanol of 10:8:200. After ultrasonic dispersion at 50kHz for 30 minutes, the mixture was stirred and refluxed at 100°C for 6 hours. After the reaction was completed, the mixture was centrifuged, washed three times with deionized water, and dried in a vacuum drying oven at 60°C for 24 hours to obtain alkenyl-modified carbon nanotubes. Step 2: Preparation of modified PET; specifically including the following steps: S31, Powdered PET resin is placed in a 35 g / L nitric acid solution, with a mass ratio of powdered PET resin to 35 g / L nitric acid solution of 1:25. The reaction is carried out at 75℃ for 50 min. After the reaction, the mixture is filtered, washed three times with deionized water, and dried in a vacuum drying oven at 60℃ for 24 h to obtain nitrated PET; S32, Nitrated PET is added to a sodium sulfide-sodium carbonate mixed solution, with a mass ratio of nitrated PET to sodium sulfide-sodium carbonate mixed solution of 1: 90. React at 95℃ for 35 min. After the reaction, filter, wash three times with deionized water, and dry in a vacuum drying oven at 60℃ for 24 h to obtain amino-modified PET. In the sodium sulfide-sodium carbonate mixed solution, the concentration of sodium sulfide is 30 g / L and the concentration of sodium carbonate is 25 g / L. S33. Mix the composite modifier with amino-modified PET at a mass ratio of 6:100, melt the mixture at 270℃, extrude, cool, and pelletize to obtain modified PET. Step 3: Melt the modified PET to obtain a melt. The melt is then extruded through a shaped spinneret at a melting temperature of 270°C. The cross-sectional shape of the shaped spinneret is cross-shaped. After cooling, the PET fibers are drawn with a draw ratio of 4 times and then chopped to obtain PET fibers. The fineness of the PET fibers is 1.5 dtex, and the average length of the PET fibers is 38 mm. Step four, the PET fibers are spun into yarns, the yarn count of the yarns is 40S, the yarns are spun into a fabric through a knitting process, and a moisture-absorbing and heat-generating thermal knitted fabric is obtained, the grammage of the moisture-absorbing and heat-generating thermal knitted fabric is 200 g / m 2 .

[0035] Comparative Example 5 The present comparative example discloses a preparation method of a moisture-absorbing and heat-generating thermal knitted fabric, comprising the following steps: Step 1: Preparation of the composite modifier; specifically including the following steps: S11, adding alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotubes, glycidyl methacrylate, and hydroxyethyl acrylate to ethyl acetate, stirring and mixing at 300 r / min for 40 min to obtain a mixture; wherein, the mass ratio of alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotubes, glycidyl methacrylate, and hydroxyethyl acrylate is 20:15:30:35, and the amount of ethyl acetate added is 3 times the total mass of alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotubes, glycidyl methacrylate, and hydroxyethyl acrylate; S1 2. Add the first part, azobisisobutyronitrile (AIBN), to the mixture and reflux at 60°C for 3 hours under a nitrogen atmosphere. After the reaction is complete, add the second part, azobisisobutyronitrile (AIBN), and reflux at 70°C for 3 hours under a nitrogen atmosphere. After the reaction is complete, add the third part, azobisisobutyronitrile (AIBN), and reflux at 75°C for 3 hours under a nitrogen atmosphere. After the reaction is complete, remove the dissolved ethyl acetate by rotary evaporation at 60°C to obtain the composite modifier. The first part, azobisisobutyronitrile, accounts for 0.1% of the total mass of the alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotubes, glycidyl methacrylate, and hydroxyethyl acrylate. The second part, azobisisobutyronitrile (AIBN), comprises 0.15% of the total mass of alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotubes, glycidyl methacrylate, and hydroxyethyl acrylate. The third part, azobisisobutyronitrile (AIBN), comprises 0.4% of the total mass of alkenyl-modified polypyrrole / montmorillonite, alkenyl-modified carbon nanotubes, glycidyl methacrylate, and hydroxyethyl acrylate. The alkenyl-modified polypyrrole / montmorillonite is prepared by the following steps: S21, dispersing montmorillonite in deionized water at a mass ratio of 0.3:100, stirring at 100 r / min for 1 h, and allowing to stand for 12 h to obtain a montmorillonite suspension; S22... 1. Ferric chloride and sodium benzenesulfonate were added to the montmorillonite suspension and stirred at 100 r / min for 30 min. Then, pyrrole was added. The mass ratio of ferric chloride, sodium benzenesulfonate, montmorillonite suspension, and pyrrole was 8.9:4.2:100.3:0.4. The reaction was carried out under nitrogen protection at room temperature for 10 h. After the reaction was completed, the mixture was ultrasonically dispersed at 50 kHz for 30 min, centrifuged, washed three times with deionized water, and dried in a vacuum drying oven at 60 ℃ for 24 h to obtain polypyrrole / montmorillonite. S23. γ-methacryloyloxypropyltrimethoxysilane was added to a 90 wt% ethanol aqueous solution, and the pH was adjusted to 3 with acetic acid.5, after stirring for 3h at room temperature, adding polypyrrole / montmorillonite, γ-methacryloxypropyltrimethoxysilane, 90wt% aqueous solution, the mass ratio of polypyrrole / montmorillonite / 90wt% aqueous solution is 6:150:10, refluxing at 65℃ for 30h, after the reaction is completed, centrifuging, washing with deionized water and ethanol for 3 times respectively, drying in a vacuum drying oven at 60℃ for 24h, obtaining alkenyl-modified polypyrrole / montmorillonite; the alkenyl-modified carbon nanotube is prepared by the following steps: adding carbon nanotube into mixed acid, the mass ratio of carbon nanotube / mixed acid is 1:5, ultrasonic dispersing at 50kHz for 30min, refluxing at 115℃ for 3.5h, after the reaction is completed, centrifuging, washing with deionized water for 5 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining acidified carbon nanotube; the mixed acid is prepared by mixing concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, the concentrated sulfuric acid is 95wt% aqueous solution of sulfuric acid, and the concentrated nitric acid is 65wt% aqueous solution of nitric acid; adding acidified carbon nanotube and γ-methacryloxypropyltrimethoxysilane into ethanol, the mass ratio of acidified carbon nanotube / γ-methacryloxypropyltrimethoxysilane / ethanol is 10:8:200, ultrasonic dispersing at 50kHz for 30min, refluxing and stirring at 100℃ for 6h, after the reaction is completed, centrifuging, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining alkenyl-modified carbon nanotube. Step two, preparing modified PET; specifically including the following steps: S31, placing powdered PET resin into 35g / L nitric acid solution, the mass ratio of powdered PET resin / 35g / L nitric acid solution is 1:25, reacting at 75℃ for 50min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining nitrated PET; S32, adding nitrated PET into sodium sulfide-sodium carbonate mixed solution, the mass ratio of nitrated PET / sodium sulfide-sodium carbonate mixed solution is 1:90, reacting at 95℃ for 35min, after the reaction is completed, filtering, washing with deionized water for 3 times, drying in a vacuum drying oven at 60℃ for 24h, obtaining amino-modified PET; wherein, in the sodium sulfide-sodium carbonate mixed solution, the concentration of sodium sulfide is 30g / L, and the concentration of sodium carbonate is 25g / L; S33, mixing composite modifier with amino-modified PET, the mass ratio of composite modifier / amino-modified PET is 6:100, melt-reaction, the temperature of melt-reaction is 270℃, extruding, cooling, pelletizing, obtaining modified PET; Step three, melting modified PET, obtaining melt, the melt is extruded through special-shaped spinneret hole, the temperature of melting is 270℃, the shape of cross section of special-shaped spinneret hole is cross shape, cooling, drawing, the draw ratio is 4 times, chopping, obtaining PET fiber; the fineness of PET fiber is 1.5dtex, and the average length of PET fiber is 38mm. Step four, the PET fibers are spun into yarns, the yarn count of the yarns is 40S, the yarns are knitted into a fabric through a knitting process, and a moisture-absorbing and heat-generating thermal knitted fabric is obtained, the fabric has a grammage of 200 g / m 2 .

[0036] Experimental example (1) Moisture absorption and perspiration performance: The water absorption of the fabrics prepared in Examples 1-3 and Comparative Examples 1-5 is determined according to the standard GB / T21655.1-2023 "Evaluation of moisture absorption and quick drying of textiles Part 1: single combination test method", the moisture permeability of the fabrics prepared in Examples 1-3 and Comparative Examples 1-5 is determined according to the standard GB / T12704.1-2009 "Textile fabric moisture permeability test method Part 1: moisture absorption method", using a FX3180-CM15 type fabric moisture permeability analyzer, and the determination results are shown in Table 1:

[0037] As shown in Table 1, the fabric prepared in the application has good moisture absorption and perspiration performance. PET is subjected to nitration and reduction reaction to introduce hydrophilic groups of amino, which can effectively improve the moisture absorption of PET, and through reaction with the composite modifier, hydrophilic components of montmorillonite and hydrophilic groups of hydroxyl in hydroxyethyl acrylate molecules are introduced, which can further improve the moisture absorption of the fabric, and the PET fibers have a special cross-section, which helps to improve the moisture absorption and perspiration performance of the fabric. Compared with Example 1: in Comparative Example 2, the PET is not modified by amino, the moisture absorption of the PET decreases, the composite modifier cannot be chemically bonded to the PET through the introduced epoxy groups, the compatibility between the PET and the composite modifier decreases, and the moisture absorption and perspiration performance further decreases; in Comparative Example 3, the amount of the composite modifier is reduced, the amount of the introduced montmorillonite and hydroxyethyl acrylate is reduced, and the moisture absorption and perspiration performance significantly decreases; in Comparative Example 4, the amount of the montmorillonite and hydroxyethyl acrylate in the composite modifier is reduced, and the moisture absorption and perspiration performance decreases.

[0038] (2) Moisture absorption and heat generation performance: The moisture absorption and heat generation temperature rise value of the fabrics prepared in Examples 1-3 and Comparative Examples 1-5 is determined according to the standard GB / T29866-2013 "Textile moisture absorption and heat generation performance test method", and the determination results are shown in Table 2:

[0039] As shown in Table 2, the fabric prepared by the application has good moisture absorption and heat generation performance. PET is introduced with hydrophilic group amino through nitration and reduction reaction, and the hydrophilic group hydroxyl in the hydrophilic group of hydroxyethyl acrylate molecule is introduced when the amino modified PET is reacted with the composite modifier. The water vapor in the atmosphere is captured by the hydrophilic group, and the hydrophilic group and the water vapor are combined in the form of hydrogen bond to be static, so that the kinetic energy is converted into heat energy, and the temperature of the fabric is increased. Compared with Example 1: in Comparative Example 2, the PET is not modified by amino, the moisture absorption of the PET is reduced, the composite modifier cannot be chemically bonded to the PET through the introduced epoxy group, the compatibility between the composite modifier and the PET is weakened, the moisture absorption performance is further reduced, the moisture absorption is reduced, and the moisture absorption and heat generation performance is reduced; in Comparative Example 3, the amount of the composite modifier is reduced, the introduced montmorillonite and hydroxyethyl acrylate are reduced, and the moisture absorption and heat generation performance is reduced; in Comparative Example 4, the amount of the montmorillonite and hydroxyethyl acrylate in the composite modifier is reduced, and the moisture absorption and heat generation performance is reduced.

[0040] (3) Light absorption and heat generation performance: the light absorption and heat generation performance of the fabric prepared in Examples 1-3 and Comparative Examples 1-5 is determined according to the standard GB / T18319-2019 "Textile light and heat storage performance test method", the irradiance of the xenon arc lamp is adjusted to 400W / m 2 , the light irradiation time is 10min, and the temperature recorder is used to automatically record the temperature change of the sample before and after the test. The test results are shown in Table 3:

[0041] As shown in Table 3, the fabric prepared by the application has good light absorption and heat generation performance. The composite modifier is prepared from alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate and hydroxyethyl acrylate as raw materials. Polypyrrole and carbon nanotube have good light-heat conversion function, so that the fabric has good light absorption and heat generation performance. Compared with Example 1: in Comparative Example 1, polypyrrole is not introduced, and the light absorption and heat generation performance is obviously reduced; in Comparative Example 2, the PET is not modified by amino, the composite modifier cannot be chemically bonded to the PET through the introduced epoxy group, the compatibility between the composite modifier and the PET is weakened, and the light absorption and heat generation performance is reduced; in Comparative Example 3, the amount of the composite modifier is reduced, the introduced polypyrrole and carbon nanotube are reduced, and the light absorption and heat generation performance is reduced; in Comparative Example 4, the amount of the polypyrrole and carbon nanotube in the composite modifier is reduced, and the light absorption and heat generation performance is reduced; in Comparative Example 5, the amount of the polypyrrole in the composite modifier is reduced, and the light absorption and heat generation performance is slightly reduced.

[0042] (4) Anti-static property: The anti-static property of the fabric prepared in Examples 1-3 and Comparative Examples 1-5 was determined according to the standard GB / T12703.2-2021 "GB / T12703.2-2021 Textiles - Determination of the chargeability - Part 2: Manual rubbing method", and the measurement results of the charge surface density are shown in Table 4:

[0043] As shown in Table 4, the fabric prepared by the application has good anti-static property. PET is nitrified and reduced to introduce hydrophilic group amino, which can effectively improve the moisture absorption of PET. By reacting with the composite modifier, the hydrophilic components montmorillonite and the hydrophilic groups hydroxyl in the hydroxyethyl acrylate molecules are introduced, which can further improve the moisture absorption of the fabric. The enhancement of moisture absorption can improve the anti-static property of PET; the introduced polypyrrole and carbon nanotube both have good conductivity, and the fabric has good anti-static property. Compared with Example 1: in Comparative Example 1, no polypyrrole was introduced, and the anti-static property decreased significantly; in Comparative Example 2, PET was not modified by amino, the moisture absorption decreased, and the composite modifier could not be chemically bonded to PET through the introduced epoxy group, the compatibility between the composite modifier and PET was weakened, and the anti-static property decreased; in Comparative Example 3, the amount of the composite modifier was reduced, the introduced hydrophilic components, hydrophilic groups, polypyrrole and carbon nanotube were reduced, and the anti-static property decreased; in Comparative Example 4, the amount of polypyrrole and carbon nanotube in the composite modifier was reduced, and the anti-static property decreased; in Comparative Example 5, the amount of polypyrrole in the composite modifier was reduced, and the anti-static property decreased slightly.

[0044] Although the embodiments of the application have been shown and described, it is to be understood that for the purpose of the present application, the embodiments can be substantially changed without departing from the spirit and the scope of the present application, the scope of the present application being defined by the appended claims and their equivalents.

Claims

1. A method of producing a moisture-absorbing heat-generating thermal knit fabric, characterized by, The method comprises the following steps: Step one, using alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, hydroxyethyl acrylate as raw materials to prepare a composite modifier; Step two, reacting the composite modifier with amino modified PET to prepare modified PET; Step three, melting the modified PET to obtain a melt, which is sprayed out through a special-shaped spinneret hole, cooled, drawn, and cut to obtain PET fiber; Step four, spinning the PET fiber into yarn, and spinning the yarn into fabric through a knitting process to obtain a moisture-absorbing and heat-generating thermal knitted fabric.

2. The method of claim 1, wherein the moisture-absorbing and heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn together. The step one specifically comprises: S11, adding alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, and hydroxyethyl acrylate into an organic solvent, stirring and mixing to obtain a mixture; S12, adding a first part of initiator to the mixture, reacting, adding a second part of initiator after the reaction is completed, continuing to react, adding a third part of initiator after the reaction is completed, and reacting again, and then rotary evaporation to obtain a composite modifier.

3. The method of claim 2, wherein the moisture-absorbing heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn together. In the S11, the mass ratio of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, and hydroxyethyl acrylate is (20-30):(15-25):(30-40):(35-45); in the S12, the first part of initiator accounts for 0.1%-0.2% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, and hydroxyethyl acrylate, the reaction conditions are refluxing at a temperature of 60-70℃ for 2-3h in a protective gas atmosphere; the second part of initiator accounts for 0.15%-0.25% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, and hydroxyethyl acrylate, the continued reaction conditions are refluxing at a temperature of 70-80℃ for 2-3h in a protective gas atmosphere; the third part of initiator accounts for 0.3%-0.4% of the total mass of alkenyl modified polypyrrole / montmorillonite, alkenyl modified carbon nanotube, glycidyl methacrylate, and hydroxyethyl acrylate, and the reaction conditions are refluxing at a temperature of 75-85℃ for 2-3h in a protective gas atmosphere.

4. The method of claim 3, wherein the moisture-absorbing heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn together. The alkenyl modified polypyrrole / montmorillonite is prepared by the following steps: S21, dispersing montmorillonite in deionized water, stirring, and standing to obtain a montmorillonite suspension; S22, adding ferric chloride and sodium benzenesulfonate to the montmorillonite suspension, stirring, then adding pyrrole, reacting, ultrasonicating after the reaction is completed, centrifuging, washing, and drying to obtain polypyrrole / montmorillonite. S23, adding γ-methacryloyloxypropyl trimethoxysilane into the aqueous ethanol solution, adjusting the pH value to 3.5-4.5, stirring, then adding the polypyrrole / montmorillonite, reacting, after the reaction is completed, centrifuging, washing, and drying to obtain the alkenyl-modified polypyrrole / montmorillonite; wherein, in the S21, the mass ratio of the montmorillonite to the deionized water is (0.3-0.5):100; in the S22, the mass ratio of the ferric trichloride, the sodium benzenesulfonate, the montmorillonite suspension, and the pyrrole is (8.9-9.3):(4.2-4.6):(100.3-100.5):(0.8-1), the reaction condition is that the reaction is carried out at room temperature for 10-15 h under nitrogen protection; in the S23, the mass ratio of the γ-methacryloyloxypropyl trimethoxysilane, the aqueous ethanol solution, and the polypyrrole / montmorillonite is (6-8):(150-250):10, the stirring condition is that the stirring is carried out at room temperature for 3-5 h, and the reaction condition is that the reaction is carried out at a temperature of 65-75 °C under reflux for 20-30 h.

5. The method of claim 3, wherein the moisture-absorbing heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn together, the first yarn being a moisture-absorbing heat-generating yarn, and the second yarn being a thermal yarn. The alkenyl-modified carbon nanotube is prepared by the following steps: adding the acidized carbon nanotube and γ-methacryloyloxypropyl trimethoxysilane into ethanol, ultrasonic dispersion, then reacting, after the reaction is completed, centrifuging, washing, and drying to obtain the alkenyl-modified carbon nanotube; wherein, the mass ratio of the acidized carbon nanotube, the γ-methacryloyloxypropyl trimethoxysilane, and the ethanol is 10:(8-12):(200-300), and the reaction condition is that the reaction is carried out at a temperature of 100-120 °C under stirring and reflux for 4-6 h.

6. The method of claim 1, wherein the moisture-absorbing heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn together. The step two specifically comprises: S31, placing the powdered PET resin into a nitric acid solution, heating and reacting, after the reaction is completed, filtering, washing, and drying to obtain nitrated PET; S32, adding the nitrated PET into a sodium sulfide-sodium carbonate mixed solution, reacting, after the reaction is completed, filtering, washing, and drying to obtain amino-modified PET; S33, mixing the composite modifier with the amino-modified PET, melt-reaction, extruding, cooling, and pelletizing to obtain modified PET.

7. The method of claim 6, wherein the moisture-absorbing heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn together, the first yarn being a moisture-absorbing heat-generating yarn, and the second yarn being a thermal yarn. In the S31, the mass ratio of the powdered PET resin to the nitric acid solution is 1:(25-35), and the heating and reaction condition is that the reaction is carried out at a temperature of 75-85 °C for 30-50 min; in the S32, the mass ratio of the nitrated PET to the sodium sulfide-sodium carbonate mixed solution is 1:(90-110), and the reaction condition is that the reaction is carried out at a temperature of 95-105 °C for 25-35 min; in the S33, the mass ratio of the composite modifier to the amino-modified PET is (6-10):100, and the melt-reaction temperature is 270-290 °C.

8. The method of claim 1, wherein the moisture-absorbing heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn, and the first yarn and the second yarn are knitted in a single layer. In the step three, the melt temperature is 270-290 °C, and the draw ratio is 3-5 times.

9. The method of claim 1, wherein the moisture-absorbing heat-generating thermal knit fabric is prepared by knitting a first yarn and a second yarn, and the first yarn and the second yarn are knitted in a single layer. In the fourth step, the yarn count of the yarn is 30-50S, and the gram weight of the moisture-absorbing and heat-generating warm knitted fabric is 180-220 g / m 2 .

10. A moisture-absorbing and heat-generating warm-keeping knitted fabric prepared by the method according to any one of claims 1-9.

Images