Antibacterial thermal insulation fabric and preparation method thereof

Abstract

The invention discloses an antibacterial thermal insulation fabric and a preparation method thereof, and relates to the technical field of fabrics. Alkaloid Schiff base is self-created and synthesized to serve as an antibacterial substance to be subjected to complex reaction with copper acetate and zinc acetate hydrate, copper ions and zinc ions are introduced into the fabric, the antibacterial effect of the fabric is improved, meanwhile, coordination complex reaction serves as a chemical bridge, the other end of the fabric is grafted to a functional group of a fiber raw material, namely polyacrylonitrile, and the antibacterial effect of the fabric is improved. The effective factor Schiff base can be firmly adsorbed on fabric fibers. A special spinning mode is adopted, fibers of a hollow structure are manufactured, and the fibers and wool are twisted and woven to manufacture the fabric which has the warm-keeping effect and is light and close-fitting. Meanwhile, after being soaked in liquid ammonia, the linen fiber, 2-hydrazinopyridine and salicylaldehyde contain hydroxyl, amino and the like, and hydrophilic groups are utilized, so that the moisture absorption performance of the fabric is improved, and bacterium breeding is effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to an antibacterial and heat-insulating fabric and its preparation method. Background Technology

[0002] People sweat unconsciously in daily life, and this moisture can remain in the fabrics they come into contact with, causing dampness and discomfort. This can make people feel uncomfortable, even affecting their quality of life and leading to certain health problems. Moisture trapped in bedding, clothing, and upholstered furniture can provide a breeding ground for bacteria and mold. This can lead to unpleasant odors, increase the risk of allergic reactions and respiratory problems, and also adversely affect skin health. Prolonged contact with damp fabrics can cause dry skin, itching, or even skin problems.

[0003] Functional fabrics have become a target for the development of everyday consumer goods. Among the fabrics that humans are most likely to come into prolonged contact with, invisible bacteria pose a potential threat to human health and the environment. Currently, due to the need for close contact with the skin, most fabrics on the market cannot incorporate organic compounds to achieve antibacterial effects. However, Schiff bases, as alkaloids, can work synergistically with copper and zinc ions to achieve effective antibacterial effects without harming the skin. The challenge lies in how to incorporate these effective factors into fabric production while simultaneously maintaining warmth. Therefore, this invention prepares a fabric that integrates antibacterial and warmth-retaining properties. Summary of the Invention

[0004] The purpose of this invention is to provide an antibacterial and heat-insulating fabric and its preparation method, so as to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an antibacterial and thermal insulation fabric, characterized in that the antibacterial and thermal insulation fabric comprises modified polyacrylonitrile fiber and modified flax fiber; the modified polyacrylonitrile fiber is obtained by melt spinning modified polyacrylonitrile chips to obtain hollow modified polyacrylonitrile fiber; the modified polyacrylonitrile chips are obtained from 2-hydrazinopyridine, salicylaldehyde, copper zinc acetate hydrate, and polyacrylonitrile; the modified flax fiber is first soaked in liquid ammonia, then dried by steam roller drying, and then impregnated with resin.

[0006] Furthermore, a method for preparing an antibacterial and thermal insulation fabric includes the following preparation steps:

[0007] (1) Copper acetate, zinc hydrate, 2-hydrazinopyridine and salicylaldehyde in a molar ratio of 1:2:2-1:4:4 were added to a polytetrafluoroethylene tube containing methanol. The molar ratio of methanol to copper acetate and zinc hydrate was 1:3-5, and the molar ratio of copper acetate and zinc acetate hydrate was 1:1. The mixture was then placed in a stainless steel reactor and sealed. The reaction was carried out at 80-100℃ for 48-72h. The mixture was allowed to cool naturally to room temperature, filtered, and the solid was taken, washed and dried to obtain the copper-zinc Schiff base complex.

[0008] (2) The average molecular weight is 1.5 × 10 5 Polyacrylonitrile, dimethylformamide, and potassium persulfate were mixed in a molar ratio of 1:2:2 and polymerized at 50°C for 10 min. The polymerization was carried out under a vacuum of 133 x 10⁻⁶ at 50°C. -5 Dry under Pa for 3 min to obtain polyacrylonitrile solution; then mix copper-zinc Schiff base complex and polyacrylonitrile solution in a molar ratio of 1:4-1:5, heat to 200℃, react for 10 min to obtain modified polyacrylonitrile, extrude and slice at 120-170℃ to obtain modified polyacrylonitrile slices.

[0009] (3) Modified polyacrylonitrile chips are melt-spun at 130℃-170℃. Spinning is carried out using a spinneret with a "C" shaped hole. After cooling, modified polyacrylonitrile fibers are obtained.

[0010] (4) After treating the flax fiber with liquid ammonia, it is placed in the liquid ammonia treatment chamber for padding. After padding, it is dried to obtain pretreated flax fiber. The pretreated fiber is immersed in 2D resin padding solution, three times for padding and three times for padding, with a soaking temperature of 30℃ and a padding rate of 80%. After pre-drying at 130℃ for 90s, it is baked at 170℃ for 60s to obtain modified flax fiber.

[0011] (5) Wool and modified polyacrylonitrile fiber are twisted together at a mass ratio of 1:1 and woven to obtain the outer fabric. Modified flax fiber and modified acrylonitrile fiber are twisted together at a mass ratio of 2:1 and woven to obtain the inner fabric. The inner and outer fabrics are sewn together with acrylonitrile long fiber to obtain an antibacterial and heat-insulating fabric with a weight of 400g / m2.

[0012] Furthermore, the washing and drying process described in step (1) involves washing the product three times with methanol and then drying it at 60°C for 24 hours.

[0013] Further, the cooling process in step (3) is as follows: the fiber opening direction is directly facing the cooling air blowing device, which is set 2-3 cm away from the lower surface of the spinneret, with a temperature of 15℃-17℃ and a wind speed of 1000-3000 rpm. Further, the drying process in step (4) is as follows: drying in a steam roller at 130℃-140℃ for 3 minutes, under a vacuum of 0.5-1 Pa, at 80℃, and with a warp tension of 2.40 N for 3 minutes.

[0014] Furthermore, in step (4), the liquid ammonia temperature for liquid ammonia treatment is -33.5 to -36°C, and the immersion time is 30 to 60 minutes; the temperature of the liquid ammonia immersion treatment chamber is 60 to 90°C, the immersion roller pressure is 1 to 2 kg, and the tensile tension is 1 to 10 kg.

[0015] Furthermore, the 2D resin impregnation solution in step (4) comprises 60 g / L of 2D resin, 18 g / L of NKC catalyst, 15 g / L of HDP strong protective agent, 25 g / L of UP softener, 0.5 g / L of penetrant, and the remainder is water.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] In preparing the antibacterial and heat-insulating fabric, the present invention involves twisting modified polyacrylonitrile fibers with wool and flax fibers that have undergone liquid ammonia cross-linking treatment to create an outer layer and an inner layer, which are then combined to achieve the effect of heat insulation and antibacterial properties of the fabric.

[0018] First, the nitrile group of 2-hydrazinopyridine reacts with the aldehyde group of salicylaldehyde to synthesize a Schiff base group, which can effectively resist bacterial growth. Then, 2-hydrazinopyridine and salicylaldehyde contain hydrophilic groups such as hydroxyl and amino groups, which can absorb moisture and improve the absorbency of the fabric. Next, the Schiff base complexes with copper zinc acetate hydrate, introducing copper and zinc ions, which work together with the Schiff base to improve the antibacterial properties of the fabric. Then, the cyanide ions in polyacrylonitrile undergo a complexation reaction with copper and zinc, so that the copper zinc Schiff base complex is firmly bound to the polyacrylonitrile long fibers, improving the antibacterial properties of the fabric. Then, using the above polyacrylonitrile-copper zinc Schiff base polymer chips as raw materials, nascent fibers are obtained according to conventional spinning processes. These nascent fibers are cooled, oiled, and drawn and wound into hollow fibers by a winding equipment, which can store more still air, thereby improving the thermal insulation effect of the material.

[0019] Secondly, the flax fibers are first soaked in liquid ammonia, which acts on the amorphous regions of the fibers, destroying some of the crystalline regions, reducing the fiber crystallinity, improving the fiber's adsorption capacity for water molecules, and expanding the internal pores of the fibers, thereby improving the fabric's moisture absorption performance. Then, the fibers are dried by steam rollers. The high temperature causes the liquid ammonia to decompose and form ammonia gas. Due to the warp tension of the fibers, the ammonia gas is quickly released with the fibers, reducing residue. Next, the treated flax fibers are impregnated with 2D resin. The resin finishing agent can combine with the hydroxyl groups in the cellulose molecules to form covalent bonds and deposit between the fiber molecules, thereby restricting the relative sliding between the macromolecular chains, improving the fabric's wrinkle resistance, and also achieving a shrinkage-resistant effect. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The testing methods for various indicators of the antibacterial and thermal insulation fabric produced in the following embodiments are as follows:

[0022] Thermal Insulation: The sample is covered on the electric heating test plate. The test plate, its surrounding and bottom heat shield (protective plate) are kept at the same constant temperature. A temperature sensor transmits data to the computer to maintain the constant temperature, ensuring that the heat of the electric heating test plate can only be dissipated through the sample. The computer determines the heating time required for the test plate to maintain a constant temperature within a certain period and calculates the thermal insulation rate. Q = (1 - Q1 / Q2) * 100%, where Q1 refers to the heat dissipation of the blank test and Q2 refers to the heat dissipation of the sample test.

[0023] Moisture absorption: The sample was soaked in distilled water for 24 hours, then centrifuged for 3 minutes to obtain mass W1. The sample was then placed in an environment with 65% humidity and allowed to stand for 48 hours to obtain mass W2. Finally, the sample was dried at 105℃ for 3 hours to obtain mass W0. The moisture absorption rate was calculated as follows: Moisture absorption rate = (W2 - W0) / W0 × 100%

[0024] Antibacterial activity: *Escherichia coli* (Gram-negative), *Staphylococcus aureus* (Gram-positive), and *Bacillus subtilis* (Gram-positive) were selected as test bacteria. The minimum inhibitory concentration (MIC) of the copper-zinc Schiff base complex against these three bacteria was investigated using a 96-well plate method. To facilitate observation of bacterial growth in the wells, INT (iodonitrobetrazolium chloride violet) was added as a bacterial staining agent. After 24 hours of bacterial culture, the concentration of the compound in wells where the solution remained clear and undiscolored was observed visually and taken as the MIC of this compound against the test bacteria.

[0025] Example 1

[0026] (1) Copper-zinc acetate hydrate, 2-hydrazinopyridine and salicylaldehyde in a molar ratio of 1:2:2 were added to a polytetrafluoroethylene tube containing methanol. The molar ratio of methanol to copper and zinc acetate hydrate was 1:3 and the molar ratio of copper acetate to zinc acetate hydrate was 1:1. The mixture was then placed in a stainless steel reactor and sealed. The reaction was carried out at 80°C for 48 hours. The mixture was then allowed to cool naturally to room temperature. After filtration, the solid was taken, washed three times with methanol, and dried at 60°C for 24 hours to obtain the copper-zinc Schiff base complex.

[0027] (2) The average molecular weight is 1.5 × 10 5Polyacrylonitrile, dimethylformamide, and potassium persulfate were mixed in a molar ratio of 1:2:2 and polymerized at 50°C for 10 min. The polymerization was carried out under a vacuum of 133 x 10⁻⁶ at 50°C. -5 The polyacrylonitrile solution was prepared by drying under Pa for 3 min. Then, the copper-zinc Schiff base complex and the polyacrylonitrile solution were mixed in a molar ratio of 1:4, heated to 200℃, and reacted for 10 min to obtain modified polyacrylonitrile. The modified polyacrylonitrile was extruded and sliced ​​at 120-170℃ to obtain modified polyacrylonitrile slices.

[0028] (3) The modified polyacrylonitrile chips are melt-spun at 130-190℃ using a spinneret with a "C" shaped hole to obtain nascent fibers. The fiber opening direction is then aligned with the cooling air blowing device, which is set 2cm away from the lower surface of the spinneret, at a temperature of 15℃ and a wind speed of 1000 rpm, to obtain modified polyacrylonitrile fibers.

[0029] (4) After treating the flax fiber with liquid ammonia, it is placed in the liquid ammonia treatment chamber for padding. The liquid ammonia temperature is -33.5°C and the padding time is 30 min. The temperature of the liquid ammonia treatment chamber is 60°C, the padding roller pressure is 1 kg, and the tensile tension is 1 kg. After padding, it is dried in a steam roller at 130°C for 3 min, and then steamed at 80°C and 2.40 N under vacuum of 0.5 Pa to obtain pretreated flax fiber. The pretreated fiber is then immersed in a 2D resin sizing solution, which includes 60 g / L of 2D resin, 18 g / L of NKC catalyst, 15 g / L of HDP strength protectant, 25 g / L of UP softener, 0.5 g / L of penetrant, and the remainder is water. The fiber is then dipped and spun three times at 30°C with a padding rate of 80%. After pre-drying at 130°C for 90 s, it is then baked at 170°C for 60 s to obtain modified flax fiber.

[0030] (5) Wool and modified polyacrylonitrile fibers are twisted and woven at a mass ratio of 1:1 to obtain the outer fabric. Modified flax fibers and modified acrylonitrile fibers are twisted and woven at a mass ratio of 2:1 to obtain the inner fabric. The inner and outer fabrics are sewn together with acrylonitrile long fibers to obtain a weight of 400 g / m². 2 Antibacterial and heat-insulating fabric.

[0031] Example 2

[0032] (1) Copper zinc acetate hydrate, 2-hydrazinopyridine and salicylaldehyde in a molar ratio of 1:3:3 were added to a polytetrafluoroethylene tube containing methanol. The molar ratio of methanol to copper zinc acetate hydrate was 1:4 and the ratio of copper acetate to zinc acetate hydrate was 1:1. The mixture was then placed in a stainless steel reactor and sealed. The reaction was carried out at 90°C for 60 h. After cooling to room temperature, the mixture was filtered, and the solid was washed three times with methanol and dried at 60°C for 24 h to obtain a copper-zinc Schiff base complex.

[0033] (2) The average molecular weight is 1.5 × 10 5 Polyacrylonitrile, dimethylformamide, and potassium persulfate were mixed in a molar ratio of 1:2:2 and polymerized at 50°C for 10 minutes. The product was then subjected to polymerization at 50°C and a vacuum degree of 133 x 10⁻⁶. -5 The polyacrylonitrile solution was prepared by drying under Pa for 3 min. Then, the copper-zinc Schiff base complex and the polyacrylonitrile solution were mixed at a molar ratio of 1:4.5, heated to 200℃, and reacted for 10 min to obtain modified polyacrylonitrile. The modified polyacrylonitrile was extruded and sliced ​​at 120-170℃ to obtain modified polyacrylonitrile slices.

[0034] (3) Modified polyacrylonitrile chips are melt-spun at 130-190℃ using a spinneret with a "C" shaped hole to obtain nascent fibers. The fiber opening direction is then aligned with the cooling air blowing device, which is set 2.5cm away from the lower surface of the spinneret, at a temperature of 16℃ and a wind speed of 2000 rpm, to obtain modified polyacrylonitrile fibers.

[0035] (4) After treating the flax fiber with liquid ammonia, it is placed in the liquid ammonia treatment chamber for padding. The liquid ammonia temperature is -33.5℃ and the padding time is 45min. The temperature of the liquid ammonia treatment chamber is 75℃, the padding roller pressure is 1.5kg, and the tensile tension is 5.5kg. After padding, it is dried in a steam roller at 135℃ for 3min, and steamed at 80℃ and 2.40N under vacuum of 0.75Pa to obtain pretreated flax fiber. The pretreated fiber is then immersed in a 2D resin sizing solution, which includes 60g / L of 2D resin, 18g / L of NKC catalyst, 15g / L of HDP strength protectant, 25g / L of UP softener, 0.5g / L of penetrant, and the remainder is water. The fiber is dipped and spun three times at 30℃ with a padding rate of 80%. After pre-drying at 130℃ for 90s, it is baked at 170℃ for 60s to obtain modified flax fiber.

[0036] (5) Wool and modified polyacrylonitrile fibers are twisted and woven at a mass ratio of 1:1 to obtain the outer fabric. Modified flax fibers and modified acrylonitrile fibers are twisted and woven at a mass ratio of 2:1 to obtain the inner fabric. The inner and outer fabrics are sewn together with acrylonitrile long fibers to obtain a weight of 400 g / m². 2 Antibacterial and heat-insulating fabric.

[0037] Example 3

[0038] (1) Copper-zinc acetate hydrate, 2-hydrazinopyridine and salicylaldehyde in a molar ratio of 1:4:4 were added to a polytetrafluoroethylene tube containing methanol. The molar ratio of methanol to copper-zinc acetate hydrate was 1:5 and the ratio of copper acetate to zinc acetate hydrate was 1:1. The mixture was then placed in a stainless steel reactor and sealed. The reaction was carried out at 100°C for 72 h. After cooling to room temperature, the mixture was filtered, and the solid was washed three times with methanol and dried at 60°C for 24 h to obtain the copper-zinc Schiff base complex.

[0039] (2) The average molecular weight is 1.5 × 10 5 Polyacrylonitrile, dimethylformamide, and potassium persulfate were mixed in a molar ratio of 1:2:2 and polymerized at 50°C for 10 minutes. The product was then subjected to polymerization at 50°C and a vacuum degree of 133 x 10⁻⁶. -5 The polyacrylonitrile solution was prepared by drying under Pa for 3 min; then, the copper-zinc Schiff base complex and the polyacrylonitrile solution were mixed in a molar ratio of 1:5, heated to 200℃, and reacted for 10 min to obtain modified polyacrylonitrile. The modified polyacrylonitrile was extruded and sliced ​​at 120-170℃ to obtain modified polyacrylonitrile slices.

[0040] (3) The modified polyacrylonitrile chips are melt-spun at 130-190℃ using a spinneret with a "C" shaped hole to obtain nascent fibers. The fiber opening direction is then aligned with the cooling air blowing device, which is set 3cm away from the lower surface of the spinneret, at a temperature of 17℃ and a wind speed of 3000 rpm, to obtain modified polyacrylonitrile fibers.

[0041] (4) After treating the flax fiber with liquid ammonia, it is placed in the liquid ammonia treatment chamber for padding. The liquid ammonia temperature is -33.5℃ and the immersion time is 60min. The temperature of the liquid ammonia treatment chamber is 90℃, the padding roller pressure is 2kg, and the tensile tension is 10kg. After padding, it is dried in a steam roller at 140℃ for 3min, and then steamed for 3min under a vacuum of 1Pa, 80℃, and a warp tension of 2.40N to obtain pretreated flax fiber. The pretreated fiber is then immersed in a 2D resin immersion solution, which includes 60g / L of 2D resin, 18g / L of NKC catalyst, 15g / L of HDP strength protectant, 25g / L of UP softener, 0.5g / L of penetrant, and the remainder is water. The fiber is dipped and swapped three times at a soaking temperature of 30℃ and a roll rate of 80%. After pre-drying at 130℃ for 90s, it is then baked at 170℃ for 60s to obtain modified flax fiber.

[0042] (5) Wool and modified polyacrylonitrile fibers are twisted and woven at a mass ratio of 1:1 to obtain the outer fabric. Modified flax fibers and modified acrylonitrile fibers are twisted and woven at a mass ratio of 2:1 to obtain the inner fabric. The inner and outer fabrics are sewn together with acrylonitrile long fibers to obtain a weight of 400 g / m². 2 Antibacterial and heat-insulating fabric.

[0043] Comparative Example 1

[0044] The difference between Comparative Example 1 and Example 2 is that step (1) is omitted, and step (2) is changed to: The average molecular weight is 1.5 × 10⁻⁶. 5 Polyacrylonitrile, dimethylformamide, and potassium persulfate were mixed in a molar ratio of 1:2:2 and polymerized at 50°C for 10 minutes. The product was then subjected to polymerization at 50°C and a vacuum degree of 133 x 10⁻⁶. -5 Dry under Pa for 3 min to obtain a polyacrylonitrile solution; then mix copper acetate zinc hydrate and polyacrylonitrile solution in a molar ratio of 1:4.5, with copper acetate and zinc acetate hydrate in a 1:1 ratio, heat to 200℃, react for 10 min to obtain modified polyacrylonitrile, extrude and slice at 145℃ to obtain modified polyacrylonitrile slices; the remaining steps are the same as in Example 2.

[0045] Comparative Example 2

[0046] The difference between Comparative Example 2 and Example 2 is that step (1) is different. Step (1) is changed to: 2-hydrazinopyridine and salicylaldehyde in a molar ratio of 1:1 are added to a polytetrafluoroethylene tube containing methanol, and then placed in a stainless steel reactor and sealed. The reaction is carried out at 90°C for 60 h, and then cooled naturally to room temperature. The mixture is filtered, the solid is taken, washed with methanol 3 times, and then dried at 60°C for 24 h to obtain the Schiff base complex. The remaining steps are the same as in Example 2.

[0047] Comparative Example 3

[0048] The difference between Comparative Example 3 and Example 2 is that step (4) is different. Step (4) is changed to: immersing flax fibers in 2D resin sizing solution, which includes 60 g / L of 2D resin, 18 g / L of NKC catalyst, 15 g / L of HDP strong protectant, 25 g / L of UP softener, 0.5 g / L of penetrant, and the remainder being water; immersing and sizing three times, with an immersion temperature of 30°C, a roll yield of 80%, pre-drying at 130°C for 90 seconds, and then baking at 170°C for 60 seconds to obtain modified flax fibers; the remaining steps are the same as in Example 2.

[0049] Comparative Example 4

[0050] The difference between Comparative Example 4 and Example 2 lies in step (4). Step (4) is changed to: treating flax fibers with liquid ammonia and then placing them in a liquid ammonia impregnation chamber; the liquid ammonia temperature is -33.5℃ and the impregnation time is 45min; the temperature of the liquid ammonia impregnation chamber is 75℃, the impregnation roller pressure is 1.5kg, and the tensile tension is 5.5kg; after impregnation, the fibers are dried in a steam roller at 135℃ for 3min, and then steamed for 3min at a vacuum of 0.75Pa, 80℃, and a warp tension of 2.40N to obtain modified flax fibers; the remaining steps are the same as in Example 2.

[0051] Comparative Example 5

[0052] The difference between Comparative Example 5 and Example 2 is that step (3) is different. Step (3) is changed to: melt spinning modified polyacrylonitrile chips at 130-190℃, so that the fiber opening direction is facing the cooling blower. The cooling blower is set at a distance of 2.5cm from the lower surface of the spinneret, the temperature is 17℃, the wind speed is 2000 rpm, and the spinneret with a circular orifice is used to obtain nascent fibers with a cross section of c, thus obtaining modified polyacrylonitrile fibers; the remaining steps are the same as in Example 2.

[0053] Example of effect

[0054] Table 1 below shows the performance analysis results of the antibacterial and thermal insulation fabrics of Examples 1 to 3 and Comparative Examples 1 to 5 of the present invention.

[0055] Table 1

[0056]

[0057]

[0058] A comparison of the antibacterial rate experimental data from the examples and comparative examples reveals that, in the preparation of the self-made modified polyacrylonitrile, the present invention reacts the nitrile group of 2-hydrazinopyridine with the aldehyde group of salicylaldehyde to synthesize a Schiff base group, which can effectively resist bacterial growth. Then, the Schiff base complexes with copper-zinc acetate hydrate, introducing copper and zinc ions, which work together with the Schiff base to improve the antibacterial properties of the fabric. Furthermore, the cyanide ions in the polyacrylonitrile undergo a complexation reaction with copper and zinc, causing the copper-zinc Schiff base complex to firmly bind to the polyacrylonitrile long fibers, further enhancing the fabric's antibacterial properties. A comparison of the hygroscopicity experimental data from the examples and comparative examples also reveals that the present invention utilizes 2-hydrazinopyridine... Salicylic aldehyde contains hydrophilic groups such as hydroxyl and amino groups, which can absorb moisture and improve the water absorption of polyacrylonitrile. Then, the flax fiber is soaked in liquid ammonia for treatment, which acts on the amorphous region of the fiber, destroys some of the crystalline regions, reduces the crystallinity of the fiber, improves the fiber's adsorption performance for water molecules, and expands the internal pores of the fiber, thereby improving the moisture absorption performance of the fabric. From the comparison of the thermal insulation experimental data of the examples and comparative examples, it can be found that the present invention uses a new pore shape to obtain "C"-shaped hollow modified polyacrylonitrile fiber, forming a hollow fiber that fully achieves the physical characteristics of hollow fiber. It contains a large amount of still air, which can bring the fabric lightweight elasticity, good moisture permeability and comfortable warmth.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. An antibacterial and thermal insulation fabric, characterized in that, The antibacterial and thermal insulation fabric includes modified polyacrylonitrile fiber and modified flax fiber; the modified polyacrylonitrile fiber is obtained by melt spinning of modified polyacrylonitrile chips to obtain hollow modified polyacrylonitrile fiber; the modified polyacrylonitrile chips are obtained by 2-hydrazinopyridine, salicylaldehyde, copper zinc acetate hydrate, and polyacrylonitrile; the modified flax fiber is first soaked in liquid ammonia, then dried by steam roller, and then impregnated with resin.

2. A method for preparing an antibacterial and thermal insulation fabric, characterized in that, The preparation steps include the following: (1) Copper acetate, zinc hydrate, 2-hydrazinopyridine and salicylaldehyde in a molar ratio of 1:2:2-1:4:4 were added to a polytetrafluoroethylene tube containing methanol. The molar ratio of methanol to copper acetate and zinc hydrate was 1:3-5, and the molar ratio of copper acetate and zinc acetate hydrate was 1:

1. The mixture was then placed in a stainless steel reactor and sealed. The reaction was carried out at 80-100℃ for 48-72h. The mixture was allowed to cool naturally to room temperature, filtered, and the solid was taken, washed and dried to obtain the copper-zinc Schiff base complex. (2) The average molecular weight is 1.5 × 10 5 Polyacrylonitrile, dimethylformamide, and potassium persulfate were mixed in a molar ratio of 1:2:2 and polymerized at 50°C for 10 min. The polymerization was carried out under a vacuum of 133 x 10⁻⁶ at 50°C. -5 Dry under Pa for 3 min to obtain polyacrylonitrile solution; then mix copper-zinc Schiff base complex and polyacrylonitrile solution in a molar ratio of 1:4-1:5, heat to 200℃, react for 10 min to obtain modified polyacrylonitrile, extrude and slice at 120-170℃ to obtain modified polyacrylonitrile slices. (3) Modified polyacrylonitrile chips are melt-spun at 130-190℃. Spinning is carried out using a spinneret with a "C" shaped hole. After cooling, modified polyacrylonitrile fibers are obtained. (4) After treating the flax fiber with liquid ammonia, it is placed in the liquid ammonia treatment chamber for padding. After padding, it is dried to obtain pretreated flax fiber. The pretreated fiber was immersed in 2D resin sizing solution, three times for each immersion and sizing, with an immersion temperature of 30℃ and a roll rate of 80%. After pre-drying at 130℃ for 90 seconds, it was then baked at 170℃ for 60 seconds to obtain modified flax fiber. (5) Wool and modified polyacrylonitrile fibers are twisted and woven at a mass ratio of 1:1 to obtain the outer fabric. Modified flax fibers and modified acrylonitrile fibers are twisted and woven at a mass ratio of 2:1 to obtain the inner fabric. The inner and outer fabrics are sewn together with acrylonitrile long fibers to obtain a weight of 400 g / m². 2 Antibacterial and heat-insulating fabric.

3. The processing method of the antibacterial and thermal insulation fabric according to claim 2, characterized in that, The washing and drying process described in step (1) involves washing the product three times with methanol and then drying it at 60°C for 24 hours.

4. The method for preparing an antibacterial and thermal insulation fabric according to claim 2, characterized in that, The specific cooling steps in step (3) are as follows: the fiber opening direction is facing the cooling blower, the cooling blower is set 2-3cm away from the lower surface of the spinneret, the temperature is 15℃-17℃, and the wind speed is 1000-3000 rpm.

5. The processing method of an antibacterial and thermal insulation fabric according to claim 2, characterized in that, In step (4), the liquid ammonia temperature for liquid ammonia treatment is -33.5 to -36°C, and the immersion time is 30 to 60 minutes; the temperature of the liquid ammonia immersion treatment chamber is 60 to 90°C, the immersion roller pressure is 1 to 2 kg, and the tensile tension is 1 to 10 kg.

6. The method for preparing an antibacterial and thermal insulation fabric according to claim 2, characterized in that, The specific drying process in step (4) is as follows: drying in a steam roller at 130℃-140℃ for 3 minutes, with a vacuum of 0.5-1Pa, 80℃, and a radial tension of 2.40N for 3 minutes.

7. The method for preparing an antibacterial and thermal insulation fabric according to claim 2, characterized in that, The 2D resin impregnation solution in step (4) comprises 60 g / L of 2D resin, 18 g / L of NKC catalyst, 15 g / L of strong protective agent, 25 g / L of UP softener, 0.5 g / L of penetrant, and the remainder is water.

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