Multi-stimulus response intelligent fiber with color and brightness controllable and adjustable functions and preparation method of multi-stimulus response intelligent fiber

Abstract

According to the multi-stimulus-response intelligent fiber with the color and brightness controllable adjustment function and the preparation method of the multi-stimulus-response intelligent fiber, pre-coding design is conducted on the fiber by establishing a mathematical model, a photoluminescent material is integrated into the fiber through micro-fluidic sequence spinning, the fiber has the outstanding fluorescence / photosensitivity, and the color and brightness of the fiber can be controlled and adjusted. Meanwhile, the prepared fibers are twisted, the prepared intelligent fibers have excellent hygroscopicity and photosensitivity, and under ultraviolet light stimulation, the fibers can emit fluorescence and display axial coding information; meanwhile, due to the AIE effect, the aggregation state of molecules and the fluorescence intensity of the prepared torsion fiber are changed along with the change of the twist number of the fiber under the stimulation of humidity. Different twist numbers of the twisted fibers correspond to different fluorescence intensities in the rotating process, quantitative conversion of fluorescence signals and humidity driving can be achieved, reversible interaction between water molecules and the twisted fibers is achieved, the aggregation state of the twisted fibers is changed, and therefore controllable adjustment of the brightness of the fibers is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of smart fibers, and in particular to a multi-stimulus responsive smart fiber with controllable color and brightness and a preparation method thereof. Background Art

[0002] Smart flexible materials refer to materials that integrate "perception", "feedback" and "response", can receive driving information (such as light, heat, electricity, magnetism, humidity, pH value, etc.), and output control actions or mechanical movements. Compared with traditional rigid materials, smart flexible materials can achieve "small stimulus and large response" according to changes in the external environment, can perceive changes in a timely, dynamic and accurate manner, and are now widely used in various smart drive devices and equipment. The design and preparation of smart flexible materials has become an emerging and important development direction in the field of intelligence, and is widely used in flexible actuators, artificial muscles, electronic devices, medical equipment and other fields. However, smart materials that can respond quickly are difficult to obtain, the preparation process is complex, and the price is expensive. There are also problems such as poor stability and single stimulus response.

[0003] The patent with publication number CN114316267B discloses a shape memory liquid crystal elastomer material with dynamically adjustable surface morphology and a preparation method thereof. The invention uses 4-(5-hexenyloxy)phenyl-4-(5-hexenyloxy)benzoate as a liquid crystal monomer and thiol as a crosslinking agent to obtain a shape memory liquid crystal elastomer material with thermal response performance. The shortcomings of the invention are pointed out that the preparation process is complicated, the drug is polluting the environment, and it is not conducive to large-scale industrial production.

[0004] The patent with publication number CN110003427A discloses a light stimulus responsive gel material, its preparation and application. The invented material is sensitive to light stimulus when placed in a solvent, and its deformation degree can be regulated by the illumination time. The longer the illumination time, the more obvious the deformation. The shortcomings of the invention are slow response rate and single stimulus response behavior.

[0005] In view of this, it is necessary to design an improved multi-stimulus responsive smart fiber with controllable color and brightness and a preparation method thereof to solve the above problems. Summary of the invention

[0006] In view of the technical problems existing in the background technology, the present application provides a multi-stimulus responsive smart fiber with controllable color and brightness and a preparation method thereof, aiming to solve the technical problems of poor stability of smart materials and single stimulus response.

[0007] In a first aspect, the present application provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness, comprising the following steps:

[0008] S1. Take photoluminescent materials of different colors, dilute them with deionized water, stir and dissolve them to obtain photoluminescent aqueous solutions of different colors;

[0009] S2. Adding a predetermined amount of sodium alginate powder to the photoluminescent aqueous solution of different colors obtained in step S1, respectively, and stirring evenly to obtain a blended spinning solution of sodium alginate and photoluminescent material of different colors;

[0010] S3. dissolving a soluble metal ion salt in deionized water to obtain a coagulation bath;

[0011] S4. Encode and design the fiber by establishing a mathematical model;

[0012] S5. According to the coding sequence designed in step S4, the blended spinning solution obtained in step S2 is injected into the coagulation bath using microfluidic sequential spinning technology to obtain axially coded sodium alginate gel fibers;

[0013] S6. Twisting the axially encoded sodium alginate gel fiber obtained in step S5 to obtain a multi-stimulus responsive smart fiber with controllable color and brightness.

[0014] In the technical scheme of the embodiment of the present application, the fiber is pre-coded by establishing a mathematical model, and the photoluminescent material is integrated into the fiber by microfluidic sequence wet spinning, so that the fiber has outstanding fluorescence / photosensitive ability, and the prepared fiber is twisted at the same time. The prepared smart fiber has excellent hygroscopicity and photosensitivity. The smart fiber absorbs water and swells under humidity stimulation, and the volume change during the water absorption and swelling process is converted into mechanical driving behavior, thereby producing high-speed, reversible torsion driving behavior. Under ultraviolet light stimulation, the fiber can emit fluorescence and display axial coding information. At the same time, due to the AIE (aggregation-induced emission) effect, the prepared torsion fiber changes with the twist number of the fiber under humidity stimulation, and the aggregation state and fluorescence intensity of the molecule also change accordingly. Different twist numbers correspond to different fluorescence intensities during rotation, and quantitative conversion of fluorescence signals and humidity drive can be realized. Water molecules and torsion fibers reversibly interact with each other, causing their aggregation state to change, thereby realizing controllable regulation of fiber brightness.

[0015] In some embodiments, the photoluminescent material is quantum dots or phosphor, the concentration of the photoluminescent aqueous solution is 0.1-0.5 mg / ml; the quantum dots are water-soluble quantum dots; and the phosphor is photoluminescent phosphor.

[0016] In this embodiment, by precisely controlling the concentration of quantum dots or phosphors, the luminescence performance of the smart fiber can be adjusted to meet the needs of different application scenarios. In addition, by selecting different types of quantum dots or phosphors, the application range of the smart fiber can be broadened.

[0017] In some embodiments, the mass percentage of sodium alginate in the blended spinning solution is 2-6 wt %; the mass percentage of photoluminescent material in the blended spinning solution is 0.16-0.8 wt %.

[0018] In this embodiment, the selected material sodium alginate has the characteristics of being cheap, green and pollution-free. The content of sodium alginate is to ensure that the spinning solution has appropriate viscosity and stability so as to form continuous and uniform fibers during the spinning process, and to ensure that the fibers have good mechanical strength and flexibility so that they are not easily broken during wearing and use. The content of the photoluminescent material ensures that the fiber has the required luminescent properties, and the appropriate concentration of the photoluminescent material can improve the response speed and reversibility of the fiber to external stimuli.

[0019] In some embodiments, the stirring rate is 200-800 rpm.

[0020] In this embodiment, stirring can effectively disperse sodium alginate and photoluminescent material uniformly in the solvent, prevent agglomeration and precipitation, and ensure uniform distribution of spinning solution components. Appropriate stirring rate helps to reduce bubbles generated during mixing. The presence of bubbles may form defects in the fiber, affecting the mechanical properties and appearance of the fiber. The stirring rate can affect the viscosity of the spinning solution. Within this rate range, a suitable viscosity can be obtained to ensure the molding of the fiber. A moderate stirring rate can accelerate the dissolution rate of the solute in the solvent, thereby improving production efficiency.

[0021] In some embodiments, the mass percentage of the soluble metal ion salt in the coagulation bath is 3-5 wt %. The soluble metal ion salt is one of a zinc ion salt, a calcium ion salt, and a mixed salt of zinc ions and calcium ions.

[0022] In this embodiment, at a concentration of 3 to 5 wt%, the metal ion salt can undergo a cross-linking reaction with the carboxyl group in sodium alginate to quickly form gel-state fibers, thereby achieving effective coagulation. An appropriate concentration of metal ion salt helps to form a fiber structure with good mechanical properties and stability, and reduces fiber breakage during subsequent processing and use. Different metal ion salts and their concentrations can affect the physical and chemical properties of the fiber, such as flexibility, strength, and biocompatibility.

[0023] In some embodiments, the coding design method is: take each color of the blended spinning solution as a basic coding unit, arrange and combine different basic coding units according to the principle of probability combination, start from a single code, gradually increase the complexity, and perform multi-stage coding design.

[0024] In this embodiment, the fibers are coded along the length direction, which expands the application scope of smart materials and meets the needs of future smart textiles. Through coding design, a combination of multiple colors can be achieved, thereby preparing smart fibers with rich color changes. Through a predetermined coding design, a single fiber can emit light of different wavelengths under ultraviolet light stimulation. The multi-order coding design gives the fiber a unique color pattern, which can be identified and interpreted for information encoding and transmission.

[0025] In some embodiments, the injection speed of the blended spinning solution is 0.1 to 0.5 ml / min.

[0026] In this embodiment, controlling the injection speed can better control the diameter of the fiber to achieve the desired fineness, which helps to form fibers with uniform structure and reduce internal defects. Sodium alginate and metal ions are successfully cross-linked directly through wet spinning, and the preparation process is simple.

[0027] In some embodiments, the twist number of the twisting process is 2000 to 6000 turns / m; the obtained multi-stimulus responsive smart fiber with controllable color and brightness has a diameter of 70 to 120 μm and a length of 4 to 20 cm.

[0028] In this embodiment, a conventional twisting process is used, and the fiber obtained after twisting has excellent hygroscopicity and can rotate at high speed under humidity stimulation. The fiber is not limited to a single stimulus response change mode, and can achieve multiple response modes of high-speed rotation and photoluminescence under humidity and ultraviolet scenes. By adjusting the number of twists, the physical properties of the fiber, such as strength, elasticity and surface characteristics, can be accurately controlled, thereby achieving controllable adjustment of color and brightness. The polymer fiber can be assembled and applied to the fields of humidity fluorescence sensors and encrypted information storage.

[0029] In a second aspect, an embodiment of the present application provides a multi-stimulus responsive smart fiber with controllable color and brightness, which is prepared by the preparation method of the first aspect.

[0030] In the technical solution of the embodiment of the present application, the obtained fiber can not only convert clean water resources into continuous mechanical energy output, but can also be designed into smart textiles through weaving, providing diversified innovative designs in the future fields of humidity-controllable intelligent visual flexible devices, smart clothing and flexible robots.

[0031] 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

[0032] 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.

[0033] Figure 1 Schematic diagram of the microfluidic sequential spinning technology used in this application.

[0034] Figure 2 300x and 500x SEM images of the fiber in Example 1 of the present application;

[0035] Figure 3 This is the minimum unit multi-level coding principle diagram of this application;

[0036] Figure 4 This is an optical photograph of the fiber with axial coding in Examples 1-3 of the present application under ultraviolet light stimulation;

[0037] Figure 5 This is a fluorescence spectrum diagram of the smart fiber in Example 1 of the present application;

[0038] Figure 6 The fluorescence spectra of the smart fibers in Examples 1 and 8 of the present application are shown;

[0039] Figure 7 These are optical photographs of the smart fibers in Examples 1 and 8 of the present application under ultraviolet light. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. 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.

[0041] 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 used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0043] 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.

[0044] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0045] Compared with traditional rigid materials, intelligent flexible materials can achieve "small stimulus and large response" according to changes in the external environment, and can perceive changes in a timely, dynamic and accurate manner. They are now widely used in various intelligent drive devices and equipment. The design and preparation of intelligent flexible materials has become an emerging and important development direction in the field of intelligence, and are widely used in flexible actuators, artificial muscles, electronic devices, medical equipment and other fields. However, intelligent materials that can respond quickly are difficult to obtain, the preparation process is complex, and the price is expensive. There are also problems such as poor stability and single stimulus response.

[0046] In order to solve the technical problems of poor stability and single stimulus response of intelligent and fast-response materials, the present application provides a multi-stimulus responsive intelligent fiber with controllable color and brightness and a preparation method thereof, wherein photoluminescent materials are integrated into the fibers through microfluidic sequential wet spinning, so that the fibers have outstanding fluorescence / photosensitivity, and the prepared fibers are twisted at the same time, and the obtained intelligent fibers have excellent hygroscopicity and photosensitivity.

[0047] In a first aspect, the present invention provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness, comprising the following steps:

[0048] S1. Take photoluminescent materials of different colors, dilute them with deionized water, stir and dissolve them to obtain photoluminescent aqueous solutions of different colors;

[0049] S2. Adding a predetermined amount of sodium alginate powder to the photoluminescent aqueous solution of different colors obtained in step S1, respectively, and stirring evenly to obtain a blended spinning solution of sodium alginate and photoluminescent material of different colors;

[0050] S3. dissolving a soluble metal ion salt in deionized water to obtain a coagulation bath;

[0051] S4. Encode and design the fiber by establishing a mathematical model;

[0052] S5. According to the coding sequence designed in step S4, the blended spinning solution obtained in step S2 is injected into the coagulation bath using microfluidic sequential spinning technology to obtain axially coded sodium alginate gel fibers;

[0053] S6. Twisting the axially encoded sodium alginate gel fiber obtained in step S5 to obtain a multi-stimulus responsive smart fiber with controllable color and brightness.

[0054] Photoluminescent materials can emit colored light after absorbing light energy. By selecting photoluminescent materials of different colors, fibers that can photoluminesce at different wavelengths can be prepared. Sodium alginate is a natural polymer that can undergo cross-linking reactions with metal ions to form a gel. The coding design achieved through mathematical models and microfluidic technology enables the fiber to have a specific color sequence and stimulus response mode, thereby achieving multifunctional intelligent response.

[0055] Furthermore, in some embodiments, the photoluminescent material is quantum dots or phosphor, the concentration of the photoluminescent aqueous solution is 0.1-0.5 mg / ml; the quantum dots are water-soluble quantum dots, preferably CdSe / ZnS quantum dots or CdTe / ZnS quantum dots; the phosphor is a photoluminescent phosphor, preferably a halide phosphor.

[0056] In the technical solution of the embodiment of the present application, quantum dots are a type of semiconductor nanocrystal whose luminescence characteristics depend on their size and shape. The luminescence of quantum dots is due to the recombination of electrons and holes within the quantum dots. Quantum dots have high luminescence efficiency, narrow luminescence spectrum, and good color purity. They can emit light at different wavelengths, and the luminescence color can be adjusted by changing the size of the quantum dots. In smart fibers, quantum dots have excellent luminescence performance and strong stability, and due to their small size, they can be more easily embedded in fibers. Phosphor is a powder containing fluorescent substances, which emits light by absorbing light energy, electrons transitioning from the ground state to the excited state, and then releasing light energy when returning to the ground state.

[0057] Furthermore, in some embodiments, the mass percentage of sodium alginate in the blended spinning solution is 2-6wt%; the mass percentage of the photoluminescent material in the blended spinning solution is 0.16-0.8wt%; and the stirring rate is 200-800rpm.

[0058] In the technical solution of the embodiment of the present application, the concentration of sodium alginate has a significant effect on the strength and stability of the gel. Too low a concentration may result in insufficient gel strength and easy fiber breakage; while too high a concentration may result in too strong a gel, affecting the flexibility and processability of the fiber. The mass percentage of the photoluminescent material directly affects the luminous efficiency of the fiber. A low concentration may result in a relatively low fluorescence value, while a high concentration may cause self-absorption and reduce the luminous efficiency. By adjusting the mass percentage of the photoluminescent material, the color and brightness of the fiber can be controlled. Different concentrations of photoluminescent materials will produce different luminous effects. The concentration of the photoluminescent material will also affect the degree of response of the fiber to external stimuli. The appropriate concentration can ensure that the fiber exhibits obvious color changes under different stimuli. The prepared gel-like blended spinning solution is allowed to stand at room temperature for 20 to 28 hours to remove bubbles.

[0059] Furthermore, in some embodiments, the mass percentage of the soluble metal ion salt in the coagulation bath is 3-5 wt %. The soluble metal ion salt is one of a zinc ion salt, a calcium ion salt, and a mixed salt of zinc ions and calcium ions.

[0060] In the technical solution of the embodiment of the present application, the concentration of the soluble metal ion salt has a significant effect on the coagulation process and final performance of the fiber. Too low a concentration may result in insufficient crosslinking reaction and unstable fiber structure. Appropriate concentration can ensure sufficient crosslinking to form fibers with good mechanical properties and stability. Too high a concentration may result in excessive crosslinking, making the fiber too hard and brittle, affecting its flexibility and functionality.

[0061] The prepared coagulation bath is allowed to stand for 0.5 to 1 hour for use. The purpose of the standing treatment is to remove bubbles.

[0062] Furthermore, in some embodiments, the coding design method is: taking each color of the blended spinning solution as a basic coding unit, and according to the principle of probability combination, different basic coding units are arranged and combined, starting from a single code, and gradually increasing the complexity to perform multi-stage coding design.

[0063] In the technical solution of the embodiment of the present application, a large amount of information can be encoded in the fiber through different combinations of colors. Each color or color combination represents a specific information bit. Different color combinations are unique and can be used as an identification mark for tracking, verification or other purposes. The coding design is not limited to color, but can also be combined with other functionalities of the fiber, such as humidity response, so as to expand the application range of the fiber. By controlling the order and combination of the coding, the coding complexity and readability of the fiber can be accurately controlled.

[0064] Furthermore, in some embodiments, the injection speed of the blended spinning solution in the microfluidic spinning technology is 0.1 to 0.5 ml / min.

[0065] In the technical solution of the embodiment of the present application, the injection speed is controlled to ensure that the diameter, uniformity, internal structure and functionality of the fiber meet the predetermined requirements.

[0066] Furthermore, in some embodiments, the twist number of the twisting process is 2000 to 6000 turns / m; the obtained multi-stimulus responsive smart fiber with controllable color and brightness has a diameter of 70 to 120 μm and a length of 4 to 20 cm.

[0067] In the technical solution of the embodiment of the present application, by controlling the number of twists in the twisting process, as well as the diameter and length of the prepared smart fiber, precise regulation of the physical properties and functional characteristics of the fiber can be achieved. This regulation not only ensures the controllable adjustment of the color and brightness of the fiber, but also enables it to adapt to a variety of stimulus response applications, thereby broadening the scope of use of smart fibers.

[0068] In a second aspect, an embodiment of the present application provides a multi-stimulus responsive smart fiber with controllable color and brightness, which is prepared by the preparation method of the first aspect.

[0069] 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.

[0070] 1. Preparation method

[0071] Example 1

[0072] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness, comprising the following steps:

[0073] S1. Take three water-soluble CdSe / ZnS quantum dot solutions with different emission wavelengths, dilute them with deionized water, stir and dissolve them to obtain photoluminescent aqueous solutions of different colors;

[0074] S2. Add 2 wt % sodium alginate powder to the photoluminescent aqueous solution of different colors obtained in step S1, stir at 200 rpm to obtain a blended spinning solution of different colors, and let stand at room temperature for 20 h;

[0075] S3. The zinc chloride was dissolved in deionized water to obtain a coagulation bath, the weight percentage of zinc chloride was 3wt%, and the prepared zinc chloride coagulation bath was allowed to stand for 0.5h;

[0076] S4. Using the primary coding design, three monochrome fiber coding units are obtained;

[0077] S5. According to the coding sequence designed in step S4, the blended spinning solution obtained in step S2 is injected into the coagulation bath using microfluidic sequential spinning technology at a rate of 0.1 ml / min to obtain axially coded sodium alginate gel fibers; the schematic diagram of microfluidic sequential spinning technology is shown in Figure 1 As shown, different types of spinning solutions are passed through a multi-component spinning needle in sequence according to a predetermined coding sequence and injected into a zinc chloride coagulation bath, and sodium alginate gel fibers with axial coding are prepared by a wet spinning process and continuously collected by a rotating drum device.

[0078] S6. The axially coded sodium alginate gel fiber obtained in step S5 is twisted at a twist number of 2000 turns / m to obtain three types of monochrome coded smart fibers.

[0079] Figure 2 This is the SEM image of one of the monochrome-coded smart fibers. It can be seen that the surface of the quantum dot fiber is smooth, which indicates that there are no obvious defects or particles attached to the fiber surface during the preparation process.

[0080] Example 2

[0081] This embodiment provides a method for preparing multi-stimulus responsive smart fibers with controllable color and brightness. Compared with Example 1, the only difference is that a two-level coding design is adopted to obtain three smart fibers with dual-color coding. The rest is roughly the same as Example 1 and will not be repeated here.

[0082] Example 3

[0083] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that a three-level coding design is adopted to obtain three types of smart fibers with three-color coding. The rest is roughly the same as Example 1 and will not be repeated here.

[0084] Example 1-3 The fiber types and complexity of the smart fibers with different levels of coding are shown in Table 1. The principle of multi-level coding is as follows: Figure 3 shown.

[0085] Table 1 Fiber types and complexity of smart fibers with different levels of coding in Examples 1-3

[0086] Example Coding combination Fiber Type Fiber complexity Example 1 (C1 3A1 3) / 2 Single color Low Example 2 (C2 3A2 3) / 2 Single two-color middle Example 3 (C3 3A3 3) / 2 Single three colors high

[0087] According to the principle of combinatorial probability, the complexity of the fiber gradually increases with the increase of code order.

[0088] Figure 4The optical photographs of the fibers with axial coding in Examples 1-3 under ultraviolet light stimulation show that the fibers have axial coding information.

[0089] Example 4

[0090] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the amount of sodium alginate powder added is 4wt%. The rest is roughly the same as Example 1 and will not be repeated here.

[0091] Example 5

[0092] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the amount of sodium alginate powder added is 6wt%. The rest is roughly the same as Example 1 and will not be repeated here.

[0093] Example 6

[0094] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the amount of zinc chloride added is 5wt%. The rest is roughly the same as Example 1 and will not be repeated here.

[0095] Example 7

[0096] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the twist number is 3000 turns / m, and the rest is roughly the same as Example 1, which will not be repeated here.

[0097] Example 8

[0098] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the twist number is 4000 turns / m, and the rest is roughly the same as Example 1, which will not be repeated here.

[0099] Example 9

[0100] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the twist number is 5000 turns / m, and the rest is roughly the same as Example 1, which will not be repeated here.

[0101] Example 10

[0102] This embodiment provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the twist number is 6000 turns / m, and the rest is roughly the same as Example 1, which will not be repeated here.

[0103] Comparative Example 1

[0104] Comparative Example 1 provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the amount of sodium alginate powder added is 8wt%, and the rest is roughly the same as Example 1, which will not be repeated here.

[0105] Comparative Example 2

[0106] Comparative Example 2 provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the amount of zinc chloride added is 8wt%, and the rest is roughly the same as Example 1, which will not be repeated here.

[0107] Comparative Example 3

[0108] Comparative Example 3 provides a method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness. Compared with Example 1, the only difference is that the twist number of the fiber twisting treatment is 1000 turns / m, and the rest is roughly the same as Example 1, which will not be repeated here.

[0109] 2. Test Method

[0110] 1. SEM test

[0111] The fiber prepared in Example 1 was subjected to SEM examination using a scanning electron microscope IT300-Jiouda.

[0112] 2. Humidity response test

[0113] The untwisting and re-twisting rates under humidity stimulation were tested on the fibers prepared in the examples and comparative examples using a digital tachometer - Chint.

[0114] 3. Fluorescence characterization

[0115] The fibers prepared in the examples and comparative examples were tested using a fluorescence spectrophotometer F97pro-prism.

[0116] III. Analysis of test results of various embodiments and comparative examples

[0117] The fluorescence test data of the smart fiber in Examples 1, 4, 5 and Comparative Example 1 are shown in Table 2:

[0118] Table 2 Fluorescence test data of smart fibers in Examples 1, 4, 5 and Comparative Example 1

[0119] Example Sodium alginate mass fraction (wt%) Fluorescence value (au) Example 1 2 270 Example 4 4 320 Example 5 6 370 Comparative Example 1 8 200

[0120] It can be seen that with the increase of the mass fraction of sodium alginate, the fluorescence value of the smart fiber first increases and then decreases. When the mass fraction of sodium alginate is 6wt%, the fluorescence intensity is high, while when the mass fraction is 8wt%, the fluorescence value decreases, which may be caused by the insufficient cross-linking of high-concentration sodium alginate and metal ions.

[0121] The fluorescence test data of the smart fiber in Examples 1, 6 and Comparative Example 2 are shown in Table 3:

[0122] Table 3 Fluorescence test data of smart fibers in Examples 1, 6 and Comparative Example 2

[0123] Example Zinc chloride mass fraction (wt%) Fluorescence value (au) Example 1 3 270 Example 6 5 380 Comparative Example 2 8 300

[0124] It can be seen that with the increase of the mass fraction of zinc chloride, the fluorescence value of the smart fiber shows a trend of first increasing and then decreasing, indicating that the fluorescence is strongest when the mass fraction of zinc chloride is 5wt%, and excessive cross-linking will inhibit the AIE phenomenon.

[0125] The UV and humidity drive test results of smart fibers with different twist numbers are shown in Table 4:

[0126] Table 4 UV and humidity driven test results of smart fibers with different twist numbers

[0127]

[0128] It can be seen that the smart fiber prepared by the experimental method of the present application can rotate at high speed under moderate stimulation, and the greater the twist number, the greater the response speed; the higher the twist number, the higher the fluorescence value.

[0129] Figure 5 This is a fluorescence spectrum diagram of the smart fiber in Example 1 of the present application. It can be seen that the emission wavelengths of different photoluminescent fibers are different.

[0130] Figure 6 The fluorescence spectra of the smart fibers in Examples 1 and 8 of the present application show that the fluorescence intensities of smart fibers with different twist numbers are different, and the higher the twist number, the higher the fluorescence value.

[0131] Figure 7 These are optical photographs of the smart fibers in Example 1 and Example 8 of the present application under ultraviolet light. It can be seen that under ultraviolet light, the brightness of the fiber with a high twist number is stronger than that of the fiber with a low twist number.

[0132] 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 multi-stimulus responsive smart fiber with controllable color and brightness, characterized in that: The following steps are involved: S1. Take photoluminescent materials of different colors, dilute them with deionized water, stir and dissolve them to obtain photoluminescent aqueous solutions of different colors; S2. Adding a predetermined amount of sodium alginate powder to the photoluminescent aqueous solution of different colors obtained in step S1, respectively, and stirring evenly to obtain a blended spinning solution of sodium alginate and photoluminescent material of different colors; S3. dissolving a soluble metal ion salt in deionized water to obtain a coagulation bath; S4. Encode and design the fiber by establishing a mathematical model; S5. According to the coding sequence designed in step S4, the blended spinning solution obtained in step S2 is injected into the coagulation bath using microfluidic sequential spinning technology to obtain axially coded sodium alginate gel fibers; S6. Twisting the axially encoded sodium alginate gel fiber obtained in step S5 to obtain a multi-stimulus responsive smart fiber with controllable color and brightness.

2. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 1, characterized in that: In step S1, the photoluminescent material is quantum dots or phosphors, and the concentration of the photoluminescent aqueous solution is 0.1-0.5 mg / ml; and / or, the quantum dots are water-soluble quantum dots; And / or, the phosphor is a photoluminescent phosphor.

3. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 1, characterized in that: In step S2, the mass percentage of sodium alginate in the blended spinning solution is 2-6wt%; And / or, the mass percentage of the photoluminescent material in the blended spinning solution is 0.16-0.8wt%.

4. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 3, characterized in that: The stirring speed is 200-800 rpm.

5. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 1, characterized in that: In step S3, the mass percentage of the soluble metal ion salt in the coagulation bath is 3-5 wt%.

6. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 5, characterized in that: The soluble metal ion salt is one of a zinc ion salt, a calcium ion salt, and a mixed salt of zinc ions and calcium ions.

7. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 1, characterized in that: In step S4, the coding design method is: taking each color of the blended spinning solution as a basic coding unit, and according to the principle of probability combination, arranging and combining different basic coding units, starting from a single code, gradually increasing the complexity, and performing multi-stage coding design.

8. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 1, characterized in that: In step S5, the injection speed of the blended spinning solution is 0.1-0.5 ml / min.

9. The method for preparing a multi-stimulus responsive smart fiber with controllable color and brightness according to claim 1, characterized in that: In step S6, the twisting number of the twisting process is 2000 to 6000 turns / meter; And / or, the obtained multi-stimulus responsive smart fiber with controllable color and brightness has a diameter of 70 to 120 μm and a length of 4 to 20 cm.

10. A multi-stimulus responsive smart fiber with controllable color and brightness, characterized in that: Prepared by the preparation method according to any one of claims 1 to 9.

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