Antibacterial and infrared heating blended fabric and preparation method thereof
By modifying the surface of tourmaline micropowder and blending it with nylon 6 to produce antibacterial infrared heating nylon fiber, the problems of complex preparation of modified tourmaline powder and insufficient antibacterial performance in the existing technology are solved, and good infrared heating and antibacterial effects of the fiber are achieved.
Patent Information
- Application Number
- CN202411754320.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2044-12-02
AI Technical Summary
The preparation method of modified tourmaline powder in the prior art is complicated and fails to effectively impart good antibacterial properties to fiber fabrics.
The surface of tourmaline powder was modified with polycarboxyl quaternary ammonium salt modifier, and then melt-blended with nylon 6 for spinning. Antibacterial quaternary ammonium salt groups were introduced and heat-drawn to prepare antibacterial infrared heating nylon fiber.
The dispersion of tourmaline powder in nylon fiber is improved, giving the fiber good infrared heating performance and excellent antibacterial properties without affecting the mechanical properties of the fiber.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of fiber fabrics, in particular to an antibacterial and infrared heating blended fabric and a preparation method thereof. Background Art
[0002] Nylon fibers and their fabrics are popular among consumers for their excellent wear resistance, strong heat resistance, and superior mechanical properties. By blending tourmaline with montmorillonite and other natural minerals, fiber fabric products with excellent mechanical properties, infrared heating, and antibacterial properties can be produced. Tourmaline is a unique natural silicate mineral with properties such as pyroelectricity, electrical conductivity, far-infrared radiation, and negative ion release. It is widely used in coatings, plastics, fiber fabrics, and other materials. Surface modification of tourmaline to improve its dispersibility and compatibility with polymer materials is a research hotspot. Common tourmaline modifiers include polyacrylic acid, sodium stearate, and Span 60. CN112608497B discloses a method for surface-modifying tourmaline powder using a coupling agent, a higher fatty acid, an unsaturated organic acid, or a water-soluble polymer modifier to obtain the modified tourmaline powder. The modified tourmaline powder is then compounded with a phenolic resin, a curing agent, and the like. Finally, the powder is blended with a carrier resin, extruded, and granulated to obtain a health-care functional fiber masterbatch, which can impart good far-infrared emission properties to fiber fabrics. However, the preparation methods of the modified tourmaline powder and health-care functional fiber masterbatch in this patent are relatively complex, and the modified tourmaline powder and health-care functional fiber masterbatch do not impart good antibacterial properties to fiber fabrics. Summary of the Invention
[0003] (1) Technical problem to be solved: The present invention provides an infrared heating blended fabric with antibacterial effect.
[0004] (2) Technical solution: An antibacterial and infrared heating blended fabric, which is blended from antibacterial infrared heating nylon fiber and a second fiber.
[0005] The preparation method of antibacterial infrared heating nylon fiber comprises the following steps:
[0006] Step S1: Add water and tourmaline powder to a reaction container, place it in an ultrasonic instrument for ultrasonic dispersion, then add a polycarboxyl quaternary ammonium salt modifier, heat to 40-55° C., stir for surface modification for 6-12 hours, filter, wash with water, and dry to obtain modified tourmaline.
[0007] Step S2: adding nylon 6 and modified tourmaline to a spinning machine for melt spinning, with a screw temperature of 245-255° C. and a screw speed of 80-100 r / min; stretching the fibers through a stretching roller of a hot stretching device, with a stretching temperature of 115-120° C. and a stretching ratio of 3-4 times; and obtaining antibacterial infrared heating nylon fibers.
[0008] Furthermore, the second fiber is wool fiber, acrylic fiber or polyester fiber.
[0009] Furthermore, in step S1, the mass of the polycarboxyl quaternary ammonium salt modifier is 5-30% of the mass of the tourmaline powder.
[0010] Furthermore, in step S1, the mass of the modified tourmaline is 0.2-2% of the mass of nylon 6.
[0011] Furthermore, the preparation method of the polycarboxyl quaternary ammonium salt modifier comprises:
[0012] (1) Nitrogen is introduced into the reaction vessel, and N,N-dimethylformamide, 2,2'-diamino-N-methyldiethylamine, alkyl diacyl chloride, and triethylamine are added in an ice bath at a molar ratio of 1:(0.9-1.1):(1-1.1), and then stirred at room temperature for 12-18 hours. N,N-dimethylformamide is removed by distillation under reduced pressure, and the mixture is washed with acetone and dried to obtain a modifier precursor. The reaction formula is as follows:
[0013]
[0014] (2) Add ethanol, modifier precursor, water, and chloroacetic acid to a reaction vessel equipped with a condenser reflux tube, heat to 75-85°C, stir and react for 18-24 hours, heat and stir to evaporate, precipitate, cool in an ice bath, filter, wash with acetone, and dry to obtain a polycarboxyl quaternary ammonium salt modifier. The reaction formula is as follows:
[0015]
[0016] Furthermore, the alkyl dicarboxylic acid chloride in (1) is 1,8-dioctanoyl chloride, azelayl chloride, sebacoyl chloride or dodecanedioyl chloride.
[0017] Furthermore, the mass of chloroacetic acid in (2) is 25-40% of the mass of the modifier precursor.
[0018] (III) Technical Effect: The present invention involves subjecting 2,2'-diamino-N-methyldiethylamine and alkyl diacyl chloride to an amidation polymerization reaction, followed by a quaternization reaction with chloroacetic acid, to obtain a polycarboxyl quaternary ammonium salt modifier containing polyamide molecular chains. The carboxyl groups in its side chains then interact with the surface of tourmaline micropowder, thereby introducing polyamide molecular chains containing quaternary ammonium salt groups onto the tourmaline surface.
[0019] The present invention melt-blends modified tourmaline with nylon 6 for spinning. Polyamide molecular chains are introduced onto the surface of the tourmaline powder, which also has polyamide molecular chains. This ensures good compatibility between the modified tourmaline powder and nylon 6, improves the dispersibility of the tourmaline powder in the nylon fiber, and does not significantly adversely affect the mechanical properties of the fiber after blending and spinning, maintaining good breaking strength and elongation. Furthermore, the tourmaline powder is evenly dispersed in the fiber matrix, significantly improving the far-infrared emissivity of the fiber and imparting good infrared heating properties to the fiber.
[0020] After the tourmaline micropowder of the present invention is modified by a polycarboxyl quaternary ammonium salt modifier, a large number of antibacterial quaternary ammonium salt groups are introduced on the surface of the tourmaline micropowder. After being blended and spun with nylon 6, the quaternary ammonium salt groups are uniformly dispersed in the fiber matrix, thereby giving the nylon fiber excellent antibacterial properties. DETAILED DESCRIPTION
[0021] To facilitate understanding of the present invention, preferred embodiments of the present invention are provided below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of the present invention.
[0022] In the specific embodiment, nylon 6 was produced by Haozheng New Materials Technology (Dongguan) Co., Ltd. Tourmaline micropowder with an average particle size of 30 nm was produced by Hangzhou Zheming New Materials Co., Ltd. Polyacrylic acid was produced by Maoming Runjing Chemical Co., Ltd.
[0023] Example 1
[0024] (1) Nitrogen was introduced into the reaction vessel, and 10 mL of N,N-dimethylformamide, 4 mmol of 2,2'-diamino-N-methyldiethylamine, 4 mmol of sebacic acid chloride, and 4.4 mmol of triethylamine were added in an ice bath, and then stirred at room temperature for 12 h. N,N-dimethylformamide was removed by distillation under reduced pressure, and the mixture was washed with acetone and dried to obtain a modifier precursor.
[0025] (2) Add 20 mL of ethanol, 2 g of the modifier precursor, 15 mL of water, and 0.6 g of chloroacetic acid to a reaction vessel equipped with a condenser reflux tube, heat to 75°C, and stir to react for 24 hours. Heat and stir to evaporate, precipitate, cool in an ice bath, filter, wash with acetone, and dry to obtain a polycarboxyl quaternary ammonium salt modifier.
[0026] (3) Add 200 mL of water and 20 g of tourmaline powder to a reaction vessel, place it in an ultrasonic instrument for ultrasonic dispersion, then add 1 g of polycarboxyl quaternary ammonium salt modifier, heat to 40°C, stir for surface modification for 8 hours, filter, wash with water, and dry to obtain modified tourmaline.
[0027] (4) 1 kg of nylon 6 and 2 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 250°C and a screw speed of 100 r / min; the fibers were stretched by the stretching rollers of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times; and antibacterial infrared heating nylon fibers were obtained.
[0028] Example 2
[0029] (1) Nitrogen was introduced into the reaction vessel, and 10 mL of N,N-dimethylformamide, 4 mmol of 2,2'-diamino-N-methyldiethylamine, 4.4 mmol of dodecane dicarboxylic acid dichloride, and 4.4 mmol of triethylamine were added in an ice bath, and then stirred at room temperature for 12 h. N,N-dimethylformamide was removed by distillation under reduced pressure, and the mixture was washed with acetone and dried to obtain a modifier precursor.
[0030] (2) Add 30 mL of ethanol, 2 g of the modifier precursor, 15 mL of water, and 0.5 g of chloroacetic acid to a reaction vessel equipped with a condenser reflux tube, heat to 85°C, and stir to react for 24 hours. Heat and stir to evaporate, precipitate, cool in an ice bath, filter, wash with acetone, and dry to obtain a polycarboxyl quaternary ammonium salt modifier.
[0031] (3) Add 250 mL of water and 20 g of tourmaline powder to a reaction vessel, place it in an ultrasonic instrument for ultrasonic dispersion, then add 2.5 g of polycarboxyl quaternary ammonium salt modifier, heat to 55 ° C, stir for surface modification for 6 hours, filter, wash with water, and dry to obtain modified tourmaline.
[0032] (4) 1 kg of nylon 6 and 2 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 245°C and a screw speed of 100 r / min; the fibers were stretched by the stretching rollers of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times; and antibacterial infrared heating nylon fibers were obtained.
[0033] Example 3
[0034] (1) Nitrogen was introduced into the reaction vessel, and 8 mL of N,N-dimethylformamide, 4 mmol of 2,2'-diamino-N-methyldiethylamine, 3.6 mmol of 1,8-dioctanoyl chloride, and 4 mmol of triethylamine were added in an ice bath. The mixture was stirred and reacted at room temperature for 18 h. N,N-dimethylformamide was removed by distillation under reduced pressure, and the mixture was washed with acetone and dried to obtain a modifier precursor.
[0035] (2) Add 25 mL of ethanol, 2 g of the modifier precursor, 15 mL of water, and 0.8 g of chloroacetic acid to a reaction vessel equipped with a condenser reflux tube, heat to 80°C, and stir to react for 24 hours. Heat and stir to evaporate, precipitate, cool in an ice bath, filter, wash with acetone, and dry to obtain a polycarboxyl quaternary ammonium salt modifier.
[0036] (3) Add 300 mL of water and 20 g of tourmaline powder to a reaction vessel, place it in an ultrasonic instrument for ultrasonic dispersion, then add 4 g of polycarboxyl quaternary ammonium salt modifier, heat to 55 ° C, stir for surface modification for 8 h, filter, wash with water, and dry to obtain modified tourmaline.
[0037] (4) 1 kg of nylon 6 and 2 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 250°C and a screw speed of 80 r / min; the fibers were stretched by a stretching roller of a hot stretching device at a temperature of 115°C and a stretching ratio of 3 times; and antibacterial infrared heating nylon fibers were obtained.
[0038] Example 4
[0039] (1) Nitrogen was introduced into the reaction vessel, and 10 mL of N,N-dimethylformamide, 4 mmol of 2,2'-diamino-N-methyldiethylamine, 4.4 mmol of azelaic acid chloride, and 4.4 mmol of triethylamine were added in an ice bath, and then stirred at room temperature for 12 h. N,N-dimethylformamide was removed by distillation under reduced pressure, and the mixture was washed with acetone and dried to obtain a modifier precursor.
[0040] (2) Add 30 mL of ethanol, 2 g of the modifier precursor, 15 mL of water, and 0.6 g of chloroacetic acid to a reaction vessel equipped with a condenser reflux tube, heat to 75°C, and stir to react for 24 hours. Heat and stir to evaporate, precipitate, cool in an ice bath, filter, wash with acetone, and dry to obtain a polycarboxyl quaternary ammonium salt modifier.
[0041] (3) Add 300 mL of water and 20 g of tourmaline powder to a reaction vessel, place it in an ultrasonic instrument for ultrasonic dispersion, then add 6 g of polycarboxyl quaternary ammonium salt modifier, heat to 50°C, stir for surface modification for 12 hours, filter, wash with water, and dry to obtain modified tourmaline.
[0042] (4) 1 kg of nylon 6 and 2 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 255°C and a screw speed of 100 r / min; the fibers were stretched by the stretching rollers of a hot stretching device at a temperature of 120°C and a stretching ratio of 3.5 times; and antibacterial infrared heating nylon fibers were obtained.
[0043] Example 5
[0044] (1) Modified tourmaline was prepared according to the method of Example 1.
[0045] (2) 1 kg of nylon 6 and 10 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 250°C and a screw speed of 100 r / min; the fibers were stretched by the stretching rollers of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times; and antibacterial infrared heating nylon fibers were obtained.
[0046] Example 6
[0047] (1) Modified tourmaline was prepared according to the method of Example 1.
[0048] (2) 1 kg of nylon 6 and 20 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 250°C and a screw speed of 100 r / min; the fibers were stretched by the stretching rollers of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times; and antibacterial infrared heating nylon fibers were obtained.
[0049] Comparative Example 1
[0050] (1) 1 kg of nylon 6 was added to a spinning machine for melt spinning, with a screw temperature of 250°C and a screw speed of 100 r / min; the fibers were stretched by a stretching roller of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times; and antibacterial infrared heating nylon fibers were obtained.
[0051] Comparative Example 2
[0052] (1) 1 kg of nylon 6 and 2 g of tourmaline powder were added to a spinning machine for melt spinning at a screw temperature of 250°C and a screw speed of 100 r / min; the fibers were stretched by a stretching roller of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times to obtain antibacterial infrared heating nylon fibers.
[0053] Comparative Example 3
[0054] (1) Nitrogen was introduced into the reaction vessel, and 10 mL of N,N-dimethylformamide, 4 mmol of 2,2'-diamino-N-methyldiethylamine, 4 mmol of sebacic acid chloride, and 4.4 mmol of triethylamine were added in an ice bath, and then stirred at room temperature for 12 h. N,N-dimethylformamide was removed by distillation under reduced pressure, and the mixture was washed with acetone and dried to obtain a modifier precursor.
[0055] (2) Add 20 mL of ethanol, 2 g of the modifier precursor, 15 mL of water, and 0.6 g of ethyl chloride to a reaction vessel equipped with a condenser reflux tube, heat to 75°C, and stir to react for 24 hours. Heat and stir to evaporate, precipitate, cool in an ice bath, filter, wash with acetone, and dry to obtain a polyquaternium salt modifier.
[0056] (3) Add 200 mL of water and 20 g of tourmaline powder to a reaction vessel, place it in an ultrasonic instrument for ultrasonic dispersion, then add 1 g of a polyquaternary ammonium salt modifier, heat to 40°C, stir for surface modification for 8 hours, filter, wash with water, and dry to obtain modified tourmaline.
[0057] (4) 1 kg of nylon 6 and 2 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 250°C and a screw speed of 100 r / min; the fibers were stretched by the stretching rollers of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times; and antibacterial infrared heating nylon fibers were obtained.
[0058] Comparative Example 4
[0059] (1) Add 200 mL of water and 20 g of tourmaline powder to a reaction vessel, place it in an ultrasonic instrument for ultrasonic dispersion, then add 1 g of polyacrylic acid, heat to 40°C, stir and perform surface modification for 8 hours, filter, wash with water, and dry to obtain modified tourmaline.
[0060] (2) 1 kg of nylon 6 and 2 g of modified tourmaline were added to a spinning machine for melt spinning at a screw temperature of 250°C and a screw speed of 100 r / min; the fibers were stretched by the stretching rollers of a hot stretching device at a temperature of 120°C and a stretching ratio of 4 times; and antibacterial infrared heating nylon fibers were obtained.
[0061] The breaking strength and elongation of nylon fiber were tested according to GB T 14344-2008.
[0062] The far-infrared performance of the fiber was tested according to the GB / T 30127-2013 method.
[0063] The test results of breaking strength, elongation and far-infrared emissivity are shown in Table 1.
[0064] Table 1: Breaking strength, elongation and far infrared emissivity tests
[0065]
[0066] As shown in Table 1, the tourmaline powder of Examples 1-6 is treated with a polycarboxyl quaternary ammonium salt modifier to introduce a polyamide molecular chain on the surface, and nylon 6 also has a polyamide molecular chain, thereby having good compatibility between the modified tourmaline powder and nylon 6, improving the dispersibility of the tourmaline powder in the nylon fiber, and after the co-spinning, the tourmaline powder does not have a large adverse effect on the mechanical properties of the fiber. Compared with Comparative Example 1, the fiber of Examples 1-6 still has good breaking strength and elongation at break. In addition, the tourmaline powder is evenly dispersed in the fiber matrix, significantly improving the far-infrared emissivity of the fiber, and can give the fiber good infrared heating performance.
[0067] The compatibility of the tourmaline powder added to Comparative Example 2 with nylon 6 was very poor, significantly affecting the mechanical properties of the fiber after blending and spinning, with a significant decrease in breaking strength and elongation. Furthermore, the tourmaline powder had poor dispersibility in the nylon fiber, resulting in a lower far-infrared emissivity than in the Examples.
[0068] Compared with Example 1, Comparative Example 3 utilizes ethyl chloride and modifier precursor to carry out quaternization reaction, and the obtained polyquaternary ammonium salt does not contain carboxyl group, is difficult to interact with the surface of tourmaline micropowder, and can not play the effect of good surface modification. After filtration and water washing, polyquaternary ammonium salt can be eluted from the surface of tourmaline micropowder, resulting in that effective surface modification does not occur in tourmaline micropowder, and the compatibility of tourmaline micropowder and nylon 6 is still very poor. After co-spinning, the mechanical properties of the fiber are greatly affected, and the breaking strength and elongation at break are significantly reduced. In addition, the dispersibility of tourmaline micropowder in nylon fiber is poor, and the far-infrared emissivity of the fiber is lower than that of Example 1.
[0069] Compared with Example 1, Comparative Example 4 uses conventional polyacrylic acid to modify the surface of tourmaline powder, but the breaking strength, elongation at break and far-infrared emissivity of the fiber are lower. This is mainly because polyacrylic acid does not contain polyamide molecular chains, and the compatibility between polyacrylic acid and nylon 6 is lower than the compatibility between polycarboxyl quaternary ammonium salt modifier and nylon 6. As a result, the compatibility of polyacrylic acid-modified tourmaline powder with nylon 6 is lower than that of the modified tourmaline in Example 1, and the breaking strength, elongation at break and far-infrared emissivity after blended reverse spinning are lower than those in Example 1.
[0070] Antibacterial properties were tested according to GB / T 20944.3-2008. The test strains were Staphylococcus aureus, Escherichia coli, and Candida albicans. Inhibition rate = (W / Q) / W × 100%.
[0071] W is the average value of the viable bacterial concentration in the flask after 18 hours of oscillation contact of the control sample (CFU / mL). The control sample is the nylon fiber prepared in Comparative Example 1.
[0072] Q is the average value of the viable bacterial concentration (CFU / mL) in the flask after 18 h of shaking contact with the antimicrobial fiber product.
[0073] The antibacterial rate test results are shown in Table 2.
[0074] Table 2: Antibacterial rate test
[0075]
[0076] As can be seen from Table 2, after the tourmaline powder of Examples 1-6 was modified with a polycarboxyl quaternary ammonium salt modifier, a large number of antibacterial quaternary ammonium salt groups were introduced on its surface. After being blended and spun with nylon 6, the quaternary ammonium salt groups were evenly dispersed in the fiber matrix, giving the nylon fiber excellent antibacterial properties.
[0077] The tourmaline powder surfaces of Comparative Examples 2, 3, and 4 all do not contain quaternary ammonium salt groups, and the antibacterial rate of the fibers is very low, and the antibacterial performance is very poor. The antibacterial rate of Comparative Example 3 is slightly higher, which may be because the polycarboxyl quaternary ammonium salt modifier on the tourmaline surface is not completely washed away, and a small amount of polycarboxyl quaternary ammonium salt modifier remains.
[0078] The antibacterial infrared heating nylon fiber prepared in each embodiment of the present invention can be blended with wool fiber, acrylic fiber or polyester fiber to produce antibacterial and infrared heating blended fabrics.
[0079] The above embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.
Claims
1. A method for preparing an antibacterial and infrared heating blended fabric, characterized in that: The antibacterial and infrared heating blended fabric is formed by blending antibacterial infrared heating nylon fiber and a second fiber; The preparation method of the antibacterial infrared heating nylon fiber comprises the following steps: Step S1, adding water and tourmaline powder to a reaction vessel, placing the mixture in an ultrasonic instrument for ultrasonic dispersion, then adding a polycarboxyl quaternary ammonium salt modifier, stirring for surface modification, filtering, washing, and drying to obtain modified tourmaline; Step S2: adding nylon 6 and modified tourmaline into a spinning machine for melt spinning, and stretching the fibers through a stretching roller of a hot stretching device to obtain antibacterial infrared heating nylon fibers; The preparation method of the polycarboxyl quaternary ammonium salt modifier comprises: (1) nitrogen is introduced into a reaction vessel, and N,N-dimethylformamide, 2,2'-diamino-N-methyldiethylamine, alkyl diacyl chloride, and triethylamine in a molar ratio of 1:(0.9-1.1):(1-1.1) are added in an ice bath, followed by stirring at room temperature for 12-18 hours, followed by vacuum distillation, washing, and drying to obtain a modifier precursor; (2) Add ethanol, modifier precursor, water, and chloroacetic acid to a reaction vessel equipped with a condenser reflux tube, heat to 75-85° C., stir and react for 18-24 hours, heat and stir to evaporate, filter after cooling, wash, and dry to obtain a polycarboxyl quaternary ammonium salt modifier.
2. The method for preparing the antibacterial and infrared heating blended fabric according to claim 1, characterized in that: The second fiber is wool fiber, acrylic fiber or polyester fiber.
3. The method for preparing the antibacterial and infrared heating blended fabric according to claim 1, characterized in that: In the step S1, the mass of the polycarboxyl quaternary ammonium salt modifier is 5-30% of the mass of the tourmaline powder.
4. The method for preparing the antibacterial and infrared heating blended fabric according to claim 1, characterized in that: In the step S1, the surface modification is performed at a temperature of 40-55° C. for 6-12 hours.
5. The method for preparing the antibacterial and infrared heating blended fabric according to claim 1, characterized in that: In step S2, the mass of the modified tourmaline is 0.2-2% of the mass of nylon 6.
6. The method for preparing the antibacterial and infrared heating blended fabric according to claim 1, characterized in that: During the melt spinning, the screw temperature is 245-255° C., and the screw speed is 80-100 r / min; the temperature during stretching is 115-120° C., and the stretching ratio is 3-4 times.
7. The method for preparing the antibacterial and infrared heating blended fabric according to claim 1, characterized in that: The alkyl dichloride in (1) is 1,8-dioctanoyl chloride, azelayl chloride, sebacoyl chloride or dodecanedioyl chloride.
8. The method for preparing the antibacterial and infrared heating blended fabric according to claim 1, characterized in that: The mass of the chloroacetic acid in (2) is 25-40% of the mass of the modifier precursor.
9. An antibacterial and infrared heating blended fabric prepared by the preparation method according to any one of claims 1 to 8.