Continuous cool cotton fiber and preparation method thereof

Abstract

The invention provides continuous cool cotton fiber and a preparation method thereof, and belongs to the technical field of functional textile processing. The preparation method of the continuous cool cotton fiber comprises the following steps: firstly, dissolving an initiator and a monomer with a boron-nitrogen functional group in a solvent, and uniformly stirring to obtain a mixed solution; soaking cotton fibers in the mixed solution, fully reacting, washing with water, and drying to obtain the continuous cool cotton fibers. By means of chemical grafting, boron-nitrogen functional groups with high heat conductivity coefficients are introduced and are combined with the surfaces of the cotton fibers through covalent bonds, and then the continuous contact cool cotton fibers are obtained. The prepared continuous cool cotton fiber is lasting in cool function and good in washing fastness, and the function and application of the cotton fiber are expanded.

Description

Technical Field

[0001] The invention relates to the technical field of functional textile processing, and in particular to a continuous cooling cotton fiber and a preparation method thereof. Background Art

[0002] Cooling textiles refer to a type of textiles that can quickly dissipate heat from the skin surface and instantly reduce the temperature when in contact with the skin, thus making people feel cool. As people's living standards improve, the comfort requirements for textiles are also getting higher and higher. In the hot summer, consumers hope that the clothes they wear and the bedding they use can bring a cool and comfortable experience. Cooling textiles came into being to meet people's demand for a cool feeling in a high temperature environment.

[0003] Cotton fiber is a natural cellulose fiber with a relatively compact structure. Compared with some synthetic fibers that have high thermal conductivity (such as metal fibers or some functional polyester fibers), cotton fibers have a lower thermal conductivity. This means that heat conduction in cotton fabrics is slow, and it is difficult to transfer heat from the skin surface as quickly as high thermal conductivity fibers, so it is not easy to produce a cool feeling. Most traditional cotton fabric modification methods use post-finishing technology to encapsulate substances with a cool feeling (such as menthol, xylitol, etc.) in microcapsules, and then attach these microcapsules to the surface of cotton fibers through adhesives and other methods. During the wearing process, due to factors such as friction, the microcapsules will gradually break and release cool substances. After the menthol microcapsules break, the menthol will evaporate on the skin surface, taking away the heat, giving people a cool feeling, just like applying a cool mint cream on the skin. Alternatively, add mineral powders with excellent thermal conductivity (such as jade powder, mica, etc.).

[0004] In the prior art, the patent with publication number CN119102035A provides a xylitol cellulose mask cloth and its preparation method and application, wherein the xylitol cellulose mask cloth comprises a cotton yarn layer with a grid structure, and both sides of the cotton yarn layer are provided with a xylitol cellulose fiber layer, and the fibers of the cotton yarn layer and the fibers of the xylitol cellulose fiber layer are interlaced and entangled with each other; by selecting cotton yarn and xylitol cellulose fibers for matching, and specially limiting the structure of the cotton yarn layer, and limiting the fibers of the cotton yarn layer and the fibers of the xylitol cellulose fiber layer to be interlaced and entangled with each other, the obtained xylitol cellulose mask cloth has excellent air permeability, cool feeling and soothing effect. However, the cool feeling obtained by the post-finishing modification method is not sustainable and has poor washability. The patent with publication number CN118704154A provides a jade-like cool anti-ultraviolet functional fabric and its preparation method, wherein cotton fiber, spandex fiber and hemp fiber are blended to form a first blended yarn, and then modal fiber and modified polyester fiber are blended to form a second blended yarn; the first blended yarn and the second blended yarn are woven by a knitting circular machine according to a weight ratio of 4:3 to obtain a knitted fabric body; the knitted fabric body is then impregnated for improvement; finally, the impregnated improved fabric body is finally heat-set at 120°C for 2 to 3s to obtain a jade-like cool anti-ultraviolet functional fabric. The modified polyester fiber of the invention and the fabric body impregnated with the impregnation liquid are coordinated, the cool feeling of the product can be improved, and the washing stability is further improved. However, blended fabrics all introduce other chemical fibers, which are not suitable for special industries that require pure cotton fabrics. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the present application provides a continuous cool cotton fiber and a preparation method thereof, aiming to solve the problem that the existing cool fabrics use post-finishing technology or introduce chemical fibers, have poor water wash resistance, and are not suitable for special scenarios.

[0006] In a first aspect, the present application provides a continuous cooling cotton fiber and a preparation method thereof, comprising the following steps:

[0007] S1. The initiator and the monomer having a boron nitrogen functional group are dissolved in a DMF solution and stirred to obtain a mixed solution;

[0008] S2. Soak the cotton fiber in the mixed solution, filter, wash and dry the mixed solution after sufficient reaction, to obtain the continuous cool cotton fiber.

[0009] In the technical solution of the embodiment of the present application, a boron nitrogen functional group with high thermal conductivity is introduced by chemical grafting, and is combined with the surface of cotton fiber by covalent bonds. The good in-plane thermal conductivity of the boron nitrogen functional group is used to build a heat conduction channel at the molecular level of cotton fiber, so that heat can be transferred between fibers more quickly, thereby obtaining continuous contact cool cotton fiber; the grafted boron nitrogen functional group will also affect the crystallization behavior of cotton fiber and promote the increase of crystallinity of cotton fiber. The increase of crystallinity usually makes the molecular chain arrangement of cotton fiber more regular, and the scattering of phonons is relatively weak, which is conducive to the transfer of heat. In this way, heat can be transferred more quickly inside the fiber and between fibers, thereby enhancing the overall cool feeling of cotton fabric. .

[0010] In some embodiments, in step S1, the initiator is benzoyl oxide; in the mixed solution, the concentration of benzoyl oxide is 0.4-0.6 mol / L.

[0011] In this embodiment, the initiator generates free radicals under heating conditions, and these free radicals attack the hydroxyl groups on the cotton fiber molecular chain, and also cause the boron nitrogen monomer to generate active free radicals, creating conditions for the boron nitrogen functional groups to be grafted onto the cotton fiber.

[0012] In some embodiments, in step S1, the monomer having a boron-nitrogen functional group is a boron-nitrogen heterocyclic compound; and in the mixed solution, the concentration of the boron-nitrogen heterocyclic compound is 0.4-0.6 mol / L.

[0013] In this embodiment, by introducing boron nitrogen functional groups and utilizing the good in-plane thermal conductivity of boron nitrogen functional groups, a thermal conductive channel is constructed at the molecular level of the cotton fiber, so that heat can be transferred more quickly within the fiber and between fibers, thereby obtaining a continuous cool contact cotton fiber.

[0014] In some embodiments, in step S2, the reaction temperature is 75-85°C.

[0015] In this embodiment, the initiator can be excited to produce free radicals at a certain temperature. Too high a temperature may cause the reaction rate to be too fast, which will make the grafting reaction difficult to control to a certain extent. Too high a temperature may also cause the reactants to decompose or cause side reactions, resulting in a decrease in grafting efficiency, and the products of the side reactions will affect the purity and performance of the final product.

[0016] In some embodiments, in step S2, the reaction time is 1.5 to 2.5 hours.

[0017] In this embodiment, the grafting reaction time is too long, and the reaction may continue after reaching equilibrium. In this case, further extending the time will not help to improve the grafting rate, but will waste time and energy.

[0018] In some embodiments, in step S2, the mass volume fraction of the cotton fiber in the mixed solution is 95-105 g / L.

[0019] In this embodiment, a certain amount of cotton fibers react with the mixed solution to ensure sufficient reaction, thereby increasing the grafting rate of boron and nitrogen functional groups.

[0020] In some embodiments, in step S1, the solvent is a DMF solution.

[0021] In this embodiment, DMF as a solvent can cause the cotton fiber to swell. During the process of grafting boron nitrogen functional groups, the swollen cotton fiber can allow the grafting reagent to enter the interior of the fiber more easily and contact more reaction sites, thereby improving the grafting efficiency.

[0022] In some embodiments, in step S2, the drying temperature is 55-65°C.

[0023] In this embodiment, the drying is performed at a specific temperature without destroying the grafting effect.

[0024] In some embodiments, the grafting rate of boron-nitrogen functional groups of the continuous cooling cotton fiber is 33-37%.

[0025] In this embodiment, the higher grafting rate greatly improves the thermal conductivity of the cotton fiber, thereby improving its cool feeling.

[0026] In some embodiments, the thermal conductivity of the cotton fabric woven with the continuous cooling cotton fiber is 0.14-0.20 W / (m·K).

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings used in the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 Schematic diagram of the chemical reaction formula for grafting boron-nitrogen heterocyclic compounds onto cotton fibers in Example 1. DETAILED DESCRIPTION

[0030] The following is a detailed description of the embodiments of the technical solution of the present application. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms "including" and "having" and any variations thereof used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In order to solve the problem that the existing existing cool fabrics adopt post-finishing technology or introduce chemical fibers, have poor water washing resistance, and are not suitable for special scenarios, the present application provides a continuous cool cotton fiber and a preparation method thereof. By chemical grafting, a boron nitrogen functional group with high thermal conductivity is introduced into the cotton fiber, and it is combined with the cotton fiber surface through a covalent bond. The good in-plane thermal conductivity of the boron nitrogen functional group is used to build a heat conduction channel at the molecular level of the cotton fiber, so that heat can be transferred between fibers more quickly, thereby obtaining a continuous contact cool cotton fiber; the grafted boron nitrogen functional group will also affect the crystallization behavior of the cotton fiber and promote the improvement of the crystallinity of the cotton fiber. The increase in crystallinity usually makes the molecular chain arrangement of the cotton fiber more regular, and the scattering of phonons is relatively weak, which is conducive to the transfer of heat. It is like opening up a new "highway" on the heat conduction road that was originally "blocked" by the cotton fiber, so that heat can be transferred more quickly inside the fiber and between fibers, thereby enhancing the overall coolness of the cotton fabric. The continuous cool cotton fiber has a long-lasting cool function and good washability, which expands the function and application of cotton fiber.

[0034] On the one hand, the present application provides a method for preparing a continuous cooling cotton fiber, comprising the following steps:

[0035] S1. dissolving the initiator and the monomer having a boron nitrogen functional group in a solvent, stirring evenly to obtain a mixed solution;

[0036] S2. Soaking the cotton fiber in the mixed solution, washing it with water and drying it after sufficient reaction, to obtain the cotton fiber with continuous cool feeling.

[0037] In the technical solution of the embodiment of the present application, a boron nitrogen functional group with high thermal conductivity is introduced by chemical grafting, and is combined with the cotton fiber surface by covalent bonds. The good in-plane thermal conductivity of the boron nitrogen functional group is used to build a heat conduction channel at the molecular level of the cotton fiber, so that heat can be transferred more quickly between fibers, thereby obtaining continuous contact cool cotton fibers; the grafted boron nitrogen functional group will also affect the crystallization behavior of the cotton fiber, promote the increase of the crystallinity of the cotton fiber, and the increase of the crystallinity will usually make the molecular chain arrangement of the cotton fiber more regular, and the scattering of phonons is relatively weak, which is conducive to the transfer of heat. In this way, heat can be transferred more quickly inside the fiber and between fibers, thereby enhancing the overall coolness of the cotton fabric.

[0038] Furthermore, in some embodiments, in step S1, the initiator is benzoyl oxide; in the mixed solution, the concentration of benzoyl oxide is 0.4-0.6 mol / L.

[0039] In the technical solution of the embodiment of the present application, the initiator generates free radicals under heating conditions, and these free radicals attack the hydroxyl groups on the cotton fiber molecular chain, and also cause the boron nitrogen monomer to generate active free radicals, creating conditions for the boron nitrogen functional groups to be grafted onto the cotton fiber.

[0040] Furthermore, in some embodiments, in step S1, the monomer having a boron-nitrogen functional group is a boron-nitrogen heterocyclic compound; and in the mixed solution, the concentration of the boron-nitrogen heterocyclic compound is 0.4-0.6 mol / L.

[0041] In the technical solution of the embodiment of the present application, by introducing boron nitrogen functional groups and utilizing the good in-plane thermal conductivity of the boron nitrogen functional groups, a thermal conductive channel is constructed at the molecular level of the cotton fiber, so that heat can be transferred between fibers more quickly; the grafted boron nitrogen functional groups will also affect the crystallization behavior of the cotton fibers and promote the increase in the crystallinity of the cotton fibers. The increase in crystallinity usually makes the molecular chains of the cotton fibers more regularly arranged, and the scattering of phonons is relatively weak, which is conducive to the transfer of heat.

[0042] Furthermore, in some embodiments, in step S2, the reaction temperature is 75-85°C.

[0043] In the technical solution of the embodiment of the present application, the initiator can be excited to produce free radicals at a certain temperature. Too high a temperature may cause the reaction rate to be too fast, which will make the grafting reaction difficult to control to a certain extent. Too high a temperature may also cause the reactants to decompose or cause side reactions, resulting in a decrease in grafting efficiency, and the products of the side reactions will affect the purity and performance of the final product.

[0044] Furthermore, in some embodiments, in step S2, the reaction time is 1.5 to 2.5 hours.

[0045] In the technical solution of the embodiment of the present application, if the grafting reaction time is too long, the reaction may continue after reaching equilibrium. In this case, further extending the time will not help to improve the grafting rate, but will waste time and energy.

[0046] Furthermore, in some embodiments, in step S2, the mass volume fraction of the cotton fiber in the mixed solution is 95-105 g / L.

[0047] In the technical solution of the embodiment of the present application, a certain amount of cotton fibers react with the mixed solution to ensure sufficient reaction, thereby making the grafting rate of the boron nitrogen functional groups higher.

[0048] Furthermore, in some embodiments, in step S1, the solvent is a DMF solution.

[0049] In the technical solution of the embodiment of the present application, DMF is used as a solvent to cause the cotton fiber to swell. During the process of grafting boron and nitrogen functional groups, the swollen cotton fiber enables the grafting agent to more easily enter the interior of the fiber and contact more reaction sites, thereby improving the grafting efficiency.

[0050] Furthermore, in some embodiments, in step S2, the drying temperature is 55-65°C.

[0051] In the technical solution of the embodiment of the present application, drying is performed at a specific temperature without destroying the grafting effect.

[0052] In a second aspect, an embodiment of the present application provides a continuous cooling cotton fiber, which is prepared by the method for preparing continuous cooling cotton fiber according to any one of claims 1 to 8, and the grafting rate of boron and nitrogen functional groups of the continuous cooling cotton fiber is 33 to 37%.

[0053] In the technical solution of the embodiment of the present application, the higher grafting rate greatly improves the thermal conductivity of the cotton fiber, thereby improving its cool feeling.

[0054] Furthermore, in some embodiments, the thermal conductivity of the cotton fabric woven with the continuous cooling cotton fiber is 0.14-0.20 W / (m·K).

[0055] Some specific embodiments are listed below. It should be noted that the embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used without specifying the manufacturer are all conventional products that can be obtained commercially.

[0056] Example 1

[0057] This embodiment provides a method for preparing a continuous cooling cotton fiber, which specifically comprises the following steps:

[0058] (1) Dissolve 0.5 mol / L benzoyl oxide and 0.5 mol / L 1,2-borane heterocycle in DMF solution, stir evenly, and obtain 1 L of mixed solution.

[0059] (2) Weigh 100 g of cotton fiber, soak it in the mixed solution, stir it evenly, react it at a reaction temperature of 80° C. for 2 h, filter it, wash it with water, and then dry it in an oven at 60° C. to obtain a cotton fiber with a continuous cool feeling.

[0060] In this embodiment, the chemical reaction formula of cotton fiber grafting boron nitrogen heterocyclic compound is as follows: Figure 1 shown.

[0061] Depend on Figure 1 It can be seen that the boron-nitrogen double bond in the 1,2-borane heterocycle opens and copolymerizes with the hydroxyl group in the cotton fiber, so that the boron-nitrogen functional group is grafted onto the cotton fiber.

[0062] The infrared spectrum test of the continuous cooling cotton fiber prepared in Example 1 showed that the grafting rate of boron nitrogen functional groups was 35%.

[0063] Examples 2 to 3 and Comparative Examples 1 to 2

[0064] Examples 2 to 3 and Comparative Examples 1 to 2 respectively provide a method for preparing a continuously cool cotton fiber. Compared with Example 1, the difference is that the concentration of benzoyl oxide is different. The specific concentration is shown in Table 1. The other steps are roughly the same as Example 1 and will not be repeated here.

[0065] Table 1 Concentration of benzoyl oxide in Examples 2 to 3 and Comparative Examples 1 to 2

[0066] Example / Comparative Example Example 2 Example 3 Comparative Example 1 Comparative Example 2 Dosage / mol / L 0.4 0.6 0.3 0.7

[0067] The continuous cool cotton fibers prepared in Examples 2 to 3 and Comparative Examples 1 to 2 were subjected to infrared spectroscopy testing to obtain the grafting rates of boron and nitrogen functional groups, as shown in Table 2.

[0068] Table 2 Grafting rate of boron nitrogen functional groups in Examples 2 to 3 and Comparative Examples 1 to 2

[0069] Example / Comparative Example Example 2 Example 3 Comparative Example 1 Comparative Example 2 Grafting rate / % 28.8 30.9 18.5 20.6

[0070] As can be seen from Table 3, the grafting effect of the continuous cool cotton fiber prepared in Examples 2 to 3 is better; the grafting effect of the continuous cool cotton fiber prepared in Comparative Examples 1 to 2 is poor, because when the concentration of the catalyst oxidized benzoyl is low, the number of active centers is limited. In the grafting reaction, the lower concentration of the catalyst results in a small number of free radicals, and these free radicals can only trigger a limited number of grafting reactions, so the grafting rate is low; however, when the catalyst concentration is too high, it will lead to over-initiation. Too many active centers will cause self-polymerization between the grafted monomers instead of being effectively grafted onto the cotton fiber, resulting in a decrease in the grafting rate.

[0071] Examples 4 to 5 and Comparative Examples 3 to 4

[0072] Examples 4 to 5 and Comparative Examples 3 to 4 respectively provide a method for preparing a continuously cool cotton fiber. Compared with Example 1, the difference is that the temperature of the grafting reaction is different, as shown in Table 3. The other steps are roughly the same as Example 1 and will not be repeated here.

[0073] Table 3 Temperature of grafting reaction in Examples 4 to 5 and Comparative Examples 3 to 4

[0074] Example / Comparative Example Example 4 Example 5 Comparative Example 3 Comparative Example 4 Temperature / ℃ 75 85 70 90

[0075] The continuous cool cotton fibers prepared in Examples 4 to 5 and Comparative Examples 3 to 4 were subjected to infrared spectroscopy testing to obtain the grafting rates of boron and nitrogen functional groups, as shown in Table 4.

[0076] Table 4 Grafting rate of boron nitrogen functional groups in Examples 4 to 5 and Comparative Examples 3 to 4

[0077] Example / Comparative Example Example 4 Example 5 Comparative Example 3 Comparative Example 4 Grafting rate / % 33 37 26.7 26.6

[0078] As can be seen from Table 4, the grafting rate of the continuous cool cotton fiber obtained in Examples 4 to 5 is good, and the grafting rate of the continuous cool cotton fiber obtained in Comparative Examples 3 to 4 is not very good, indicating that when the concentration of the initiator benzoyl oxide is 0.4 to 0.6 mol / L and the reaction temperature is 75 to 85 ° C, the boron nitrogen functional group can have a higher grafting rate. This is because at a lower temperature, the molecular motion in the reaction system, the diffusion rate of the monomer, and the reaction rate of forming chemical bonds are relatively slow. Furthermore, the generation of free radicals, the diffusion of monomers, and the formation of chemical bonds are slowed down and insufficient. Thereby reducing the grafting rate; when the temperature is too high, some unfavorable situations will occur. On the one hand, the initiator may decompose too quickly and produce too many free radicals. These free radicals will terminate each other, resulting in a decrease in the concentration of free radicals that effectively initiate the grafting reaction; on the other hand, too high a temperature will break the molecular chain of the fiber, reduce the active sites available for grafting, and also cause the grafted part to fall off, resulting in a decrease in the grafting rate.

[0079] The thermal conductivity of the continuous cooling cotton fibers prepared in Examples 1 to 5 and Comparative Examples 1 to 4 was tested and compared with that of the cotton fibers that had not been grafted. The test results are shown in Table 5.

[0080] Table 5 Thermal conductivity of continuous cool cotton fibers obtained from Examples 1 to 5, Comparative Examples 1 to 4 and cotton fibers not grafted

[0081]

[0082] It can be seen from Table 5 that the thermal conductivity of the continuous cooling cotton fibers prepared in Examples 1 to 5 is greatly improved compared with the cotton fibers that have not been grafted; the thermal conductivity of the continuous cooling cotton fibers prepared in Comparative Examples 1 to 4 is also improved compared with the thermal conductivity of the cotton fibers that have not been grafted, but the optimal effect has not been achieved.

[0083] In summary, the present application provides a continuous cool cotton fiber and a preparation method thereof. By means of chemical grafting, a boron nitrogen functional group with high thermal conductivity is introduced into the cotton fiber, and the boron nitrogen functional group is combined with the cotton fiber surface by a covalent bond. The good in-plane thermal conductivity of the boron nitrogen functional group is utilized to construct a heat conduction channel at the molecular level of the cotton fiber, so that heat can be transferred between fibers more quickly, thereby obtaining continuous contact cool cotton fibers; the grafted boron nitrogen functional group also affects the crystallization behavior of the cotton fiber and promotes the improvement of the crystallinity of the cotton fiber. The increase in crystallinity usually makes the molecular chain arrangement of the cotton fiber more regular, and the scattering of phonons is relatively weak, which is conducive to the transfer of heat. It is like opening up a new "highway" on the heat conduction road that was originally "blocked" by the cotton fiber, so that heat can be transferred more quickly inside the fiber and between fibers, thereby enhancing the overall coolness of the cotton fabric. The continuous cool cotton fiber has a long-lasting cool function and good washability, which expands the function and application of cotton fiber.

[0084] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for preparing a continuous cool cotton fiber, characterized in that: The following steps are involved: S1. dissolving the initiator and the monomer having a boron nitrogen functional group in a solvent, stirring evenly to obtain a mixed solution; S2. Soaking the cotton fiber in the mixed solution, washing it with water and drying it after sufficient reaction, to obtain the cotton fiber with continuous cool feeling.

2. The method for preparing the continuous cool cotton fiber according to claim 1, characterized in that: In step S1, the initiator is benzoyl oxide; in the mixed solution, the concentration of benzoyl oxide is 0.4-0.6 mol / L.

3. The method for preparing the continuous cool cotton fiber according to claim 1, characterized in that: In step S1, the monomer with boron nitrogen functional groups is a boron nitrogen heterocyclic compound; in the mixed solution, the concentration of the boron nitrogen heterocyclic compound is 0.4-0.6 mol / L.

4. The method for preparing the continuous cool cotton fiber according to claim 1, characterized in that: In step S2, the reaction temperature is 75-85°C.

5. The method for preparing the continuous cool cotton fiber according to claim 1, characterized in that: In step S2, the reaction time is 1.5 to 2.5 hours.

6. The method for preparing the continuous cool cotton fiber according to claim 1, characterized in that: In step S2, the mass volume fraction of the cotton fiber in the mixed solution is 95-105 g / L.

7. The method for preparing the continuous cool cotton fiber according to claim 1, characterized in that: In step S1, the solvent is DMF solution.

8. The method for preparing the continuous cool cotton fiber according to claim 1, characterized in that: In step S2, the drying temperature is 55-65°C.

9. A continuous cool cotton fiber, characterized in that: The continuous cooling cotton fiber is prepared by the preparation method of any one of claims 1 to 8, wherein the grafting rate of boron and nitrogen functional groups of the continuous cooling cotton fiber is 33 to 37%.

10. The continuous cooling cotton fiber according to claim 9, characterized in that: The thermal conductivity of the continuous cooling cotton fiber is 0.14-0.20 W / (m·°C).

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