Multi-stage driving muscle yarn for coping with damp-heat coupling complex scene

Abstract

The invention relates to the technical field of textile materials, and discloses a multi-stage driving muscle yarn for a damp-heat coupling complex scene, the multi-stage driving muscle yarn comprises the following materials: a temperature response type monomer, a cross-linking agent, an initiator, a solvent, a hydrophilic yarn base material, a constant-temperature water bath, a vacuum oven, an ultraviolet curing box, a mechanical twisting machine (supporting Z twist / S twist) and a pH meter, the yarn is soaked in a solution, it is ensured that stable reaction active sites can be formed on the surface of the yarn, and the yarn is soaked in the solution for 30 minutes to 1 hour. The safety and operability of the product are ensured; secondly, by adjusting the twist number and the twist direction of the single-strand or multi-strand yarn, the performance of the yarn in the damp-heat coupling environment can be accurately adjusted and controlled, and a flexible adjusting space is provided to meet different application requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of textile materials, and specifically to a multi-stage driven muscle yarn for coping with complex scenarios of coupled humidity and heat. Background Art

[0002] Muscle yarn is a high-strength functional yarn with a compact structure, a smooth surface, and no obvious fluff. It is usually formed by high-twist twisting of single or multiple fibers, forming a tough characteristic similar to "muscle". Such yarns are known for their excellent elasticity and resilience, and can effectively support muscles and adapt to high-intensity stretching. Common materials include spandex core-spun yarn, high-elastic polyester or nylon blends, which achieve low-elongation deformation and rapid recovery performance through special processes, while also taking into account breathability and durability, and are key materials for high-performance textiles.

[0003] The authorized announcement number (CN 115948835 B) discloses a process for preparing a shrink-swell yarn based on a thermally driven artificial muscle fiber material, including the following steps: preparing a twist-rolled thermally driven artificial muscle fiber material; performing a constant elongation cyclic mechanical training on the thermally driven artificial muscle fiber material; using the trained thermally driven artificial muscle fiber material as an outer cladding layer and a coarse denier low modulus high elongation fiber material as a core layer to prepare a single wrapped yarn; applying electricity to both ends of the single wrapped yarn, and the artificial muscle fiber material in the wrapped yarn body generates a thermally induced contraction, causing a reversible transformation of the structure between the outer cladding layer and the core layer in the yarn body, forming a shrink-swell yarn. The single wrapped yarn prepared in this application only requires a certain thermal excitation to produce a significant shrink-swell effect, and still has a robust shrink-swell effect under cyclic thermal excitation; this application is simple to prepare, has a low processing cost, and a convenient excitation method, and is worthy of popularization and application;

[0004] In the field of dynamic humidity and heat management, the prior art usually considers temperature or humidity stimuli separately, such as using single-response fibers or simple twist structure designs. However, there is a strong coupling effect between the wet and heat factors in the body domain microenvironment. Traditional methods cannot precisely coordinate the interaction between the two, resulting in adjustment lag or insufficient effect. In addition, the driving ability of traditional muscle yarns is limited, and it is difficult to achieve adaptive deformation in multiple scenarios. In the research on dynamic humidity and heat management yarns for environmental perception, changes in the wet / heat environment often occur simultaneously and cannot be considered separately. Among them, the body domain wet / heat microenvironment is composed of three main factors: temperature, humidity, and sweat, and there are interactions and influences between the factors. The current research progress often only designs fiber materials and twist structures for a specific stimulus (wet stimulus or heat stimulus), and fails to fully consider the coupling effect of wet / heat stimuli, making the humidity and heat adjustment process unable to precisely respond to environmental changes to meet the sensitive needs of the body surface for comfort, restricting its final effect.

[0005] Therefore, those skilled in the art have provided a multi-stage driven muscle yarn to cope with the complex scenario of wet-heat coupling to solve the problems raised in the above-mentioned background art. Summary of the Invention

[0006] To achieve the above object, the present invention provides the following technical solutions.

[0007] A multi-stage driven muscle yarn for coping with the complex scenario of wet-heat coupling, the multi-stage driven muscle yarn includes the following materials:

[0008] Temperature-responsive monomer, crosslinking agent, initiator, solvent, hydrophilic yarn substrate, constant temperature water bath, vacuum oven, ultraviolet curing box, mechanical twisting machine (supporting Z twist / S twist) and pH meter.

[0009] Preferably, a preparation method of the multi-stage driven muscle yarn for coping with the complex scenario of wet-heat coupling, S1, yarn pretreatment: Immerse the yarn in a solution to ensure that stable reactive sites can be formed on the surface of the yarn. The yarn is immersed in the solution for 30 minutes to 1 hour to ensure that it completely absorbs the chemical components in the solution. Subsequently, place the yarn in a temperature-controlled environment at 60-90 °C for reaction, so that a chemical reaction occurs between the surface of the yarn and the siloxane coupling agent to form carbon-carbon double bonds, providing a basis for the subsequent binding of the temperature-responsive monomer. After the treatment is completed, heat the yarn in a vacuum drying oven to 100-115 °C and dry it for 12 to 24 hours to ensure that the yarn is completely dry and stable;

[0010] S2, preparation of temperature-responsive monomer solution: Select a suitable temperature-responsive monomer according to needs and dissolve it in an appropriate amount of solvent, and the concentration is generally controlled between 10% and 50%. To improve the binding force between the yarn and the temperature-responsive monomer, add an appropriate amount of crosslinking agent (0.5%-3%) and initiator (1%-6%), and after mixing evenly, immerse the pretreated yarn in step S1 in the solution to ensure that the yarn is completely soaked. The soaking time is 1 to 3 hours, and the specific time depends on the absorption of the yarn to obtain a temperature-responsive yarn;

[0011] S3, ultraviolet curing treatment: The temperature-responsive yarn in step S2 is cured by ultraviolet rays. The soaked yarn is pre-baked to remove excess solvent, and the yarn is heated to 70-120 °C, and the baking time is controlled within 1 to 3 minutes. The yarn is exposed to ultraviolet light for curing. Under ultraviolet light irradiation, the temperature-responsive monomer undergoes a polymerization reaction, and a crosslinked structure will be formed on the surface of the yarn, thereby endowing the yarn with controllable expansion or contraction characteristics under temperature changes;

[0012] S4. Yarn Twisting and Plies Forming: Using the mechanical twisting method, the temperature-responsive thermosensitive yarns and hydrophilic yarns solidified in step S3 are subjected to single-strand twisting and ply twisting with different twist numbers clockwise and counterclockwise to construct a multi-level moisture absorption gradient structure. The temperature-responsive thermosensitive yarns are twisted into single strands and multiple plies. For single-strand twisting, the twist number is (0 - 350); for multiple-ply twisting, the number of plies is greater than 1, and the twist number is (0 - 350), thus obtaining multi-stage driving muscle yarns for coping with complex scenarios of coupled heat and humidity.

[0013] S5. Final Treatment: After twisting and ply forming are completed, the yarns are washed to remove residual chemical reagents and solvents to ensure the safety and stability of the yarns. After washing, the yarns are thoroughly dried and subjected to performance testing, especially the heat and humidity responsiveness. The test contents include the moisture absorption, swelling, shrinkage of the yarns, and their stability in a heat and humidity environment, ensuring that the prepared yarns meet the design requirements and have good heat and humidity response capabilities.

[0014] Preferably, the pretreatment mixed solution in step S1 is made of water and the siloxane coupling agent TMSPMA, prepared according to a volume ratio of 2:1, and the solution pH = 3 - 4 is adjusted with formic acid or acetic acid. The hydrophilic yarn substrate can be one of cotton yarns, viscose fibers, or regenerated cellulose fibers.

[0015] Preferably, the temperature-responsive monomers in step S2 can be at least one of N-isopropylacrylamide, 2-(2-methoxyethoxy)ethyl 2-methylacrylate, 2-carboxyisopropylacrylamide, N,N-diethylacrylamide, N-acryloyl-N'-alkylpiperazine, N-1-hydroxymethylpropylacrylamide, N-acryloylglycine amide, and [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide;

[0016] The solvent can be one of absolute ethanol or trifluoroethanol;

[0017] The crosslinking agent can be one of ethylene glycol dimethacrylate or N,N'-methylenebisacrylamide

[0018] The initiator can be one of 2,2-diethoxyacetophenone or 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

[0019] Preferably, the wavelength of the ultraviolet lamp in step S3 is set at 365 nm, the irradiation power is 200 - 400 W, and the irradiation time is 2 to 10 minutes.

[0020] Preferably, in step S4, the single-strand muscle yarn is mechanically single-stranded twisted with the prepared temperature-responsive thermosensitive yarn and hydrophilic yarn, mainly including single-strand yarn Z-twist (twist number 0-150), single-strand yarn Z-twist (twist number 150-250), single-strand yarn Z-twist (twist number 250-350); single-strand yarn S-twist (twist number 0-150), single-strand yarn S-twist (twist number 150-250), single-strand yarn S-twist (twist number 250-350);

[0021] The multi-strand muscle yarn is mechanically multi-stranded twisted with the prepared temperature-responsive thermosensitive yarn and hydrophilic yarn. Taking two-strand twisting as an example, the single-strand Z-twist (S-twist) temperature-responsive thermosensitive yarn (twist number 250-350) and the single-strand Z-twist (S-twist) hydrophilic yarn (twist number 0-150) are S-twist (Z-twist) combined with a twist number of 50-150; or the single-strand Z-twist (S-twist) temperature-responsive thermosensitive yarn (twist number 0-150) and the single-strand Z-twist (S-twist) hydrophilic yarn (twist number 250-350) are S-twist (Z-twist) combined with a twist number of 50-150.

[0022] Compared with the prior art, the present invention provides a multi-stage drive muscle yarn for coping with the complex scenario of coupled heat and humidity, and has the following beneficial effects:

[0023] The multi-stage drive muscle yarn for coping with the complex scenario of coupled heat and humidity has a simple preparation process and the experimental materials used are harmless to the human body, ensuring the safety and operability of the product; secondly, by adjusting the twist number and twist direction of the single-strand or multi-strand yarn, the performance of the yarn in the coupled heat and humidity environment can be precisely controlled, providing a flexible adjustment space to meet different application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic flow chart of the preparation method of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the preparation mechanism flow of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the single-strand twisting of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the double-strand twisting of the present invention;

[0028] Figure 5 It is a schematic structural diagram of the single-strand S-twist of the present invention;

[0029] Figure 6 It is a schematic structural diagram of the single-strand Z-twist of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the double-strand Z-twist combined twisting (ZZZ) of the present invention;

[0031] Figure 8 Schematic diagram of the double - strand S - twist ply - twisting (SSZ) structure of the present invention. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] Embodiment

[0034] Embodiment of a multi - stage driven muscle yarn for coping with complex scenarios of coupled humidity and heat

[0035] A multi - stage driven muscle yarn for coping with complex scenarios of coupled humidity and heat, the multi - stage driven muscle yarn comprising the following materials:

[0036] Temperature - responsive monomer, cross - linker, initiator, solvent, hydrophilic yarn substrate, constant - temperature water bath, vacuum oven, ultraviolet light - curing oven, mechanical twisting machine (supporting Z - twist / S - twist), and pH meter.

[0037] Preparation method of a multi - stage driven muscle yarn for coping with complex scenarios of coupled humidity and heat. S1. Yarn pretreatment: Immerse the yarn in a solution to ensure that stable reactive sites can be formed on the surface of the yarn. The yarn is immersed in the solution for 30 minutes to 1 hour to ensure that it completely absorbs the chemical components in the solution. Subsequently, place the yarn in a temperature - controlled environment at 60 - 90 °C for reaction, so that a chemical reaction occurs between the surface of the yarn and the siloxane coupling agent to form carbon - carbon double bonds, providing a basis for the subsequent binding of the temperature - responsive monomer. After the treatment is completed, heat the yarn in a vacuum drying oven to 100 - 115 °C and dry it for 12 to 24 hours to ensure that the yarn is completely dry and stable.

[0038] S2. Preparation of the temperature - responsive monomer solution: Select a suitable temperature - responsive monomer according to needs and dissolve it in an appropriate amount of solvent. The concentration is generally controlled between 10% and 50%. To improve the binding force between the yarn and the temperature - responsive monomer, add an appropriate amount of cross - linker (0.5% - 3%) and initiator (1% - 6%). After mixing evenly, immerse the pretreated yarn in step S1 in the solution to ensure that the yarn is completely soaked. The soaking time is 1 to 3 hours, and the specific time depends on the absorption of the yarn to obtain a temperature - responsive yarn.

[0039] S3. UV curing treatment: The temperature-responsive yarn in step S2 is cured by ultraviolet light. The soaked yarn is pre-baked to remove excess solvent, and the yarn is heated to 70 - 120 °C with a baking time controlled within 1 to 3 minutes. Then the yarn is exposed to ultraviolet light for curing. Under ultraviolet light irradiation, the temperature-responsive monomer undergoes a polymerization reaction, and a cross-linked structure will form on the yarn surface, thereby endowing the yarn with controllable expansion or contraction characteristics under temperature changes;

[0040] S4. Yarn twisting and doubling: The cured temperature-responsive thermosensitive yarn and hydrophilic yarn in step S3 are subjected to single-strand twisting and multi-strand twisting with different twist numbers in clockwise and counterclockwise directions using mechanical twisting methods to construct a multi-level moisture absorption gradient structure. The temperature-responsive thermosensitive yarn is subjected to single-strand twisting and multi-strand twisting. For single-strand twisting, the twist number is (0 - 350); for multi-strand twisting, the number of strands is greater than 1, and the twist number is (0 - 350), to obtain a multi-stage drive muscle yarn for coping with complex scenarios of coupled heat and humidity;

[0041] S5. Final treatment: After completion of twisting and doubling, the yarn is washed to remove residual chemical reagents and solvents to ensure the safety and stability of the yarn. After washing, the yarn is thoroughly dried and subjected to performance testing, especially the heat and humidity responsiveness. The test contents include the moisture absorption, expansion, contraction of the yarn, and its stability in a heat and humidity environment to ensure that the prepared yarn meets the design requirements and has good heat and humidity response capabilities.

[0042] The above technical solution can be adaptively adjusted according to different temperature and humidity conditions, showing significant temperature and humidity responsiveness. When the temperature is below 32 °C, the temperature-responsive thermosensitive yarn shows a hydrophobic state and does not absorb moisture; while when the temperature is above 32 °C, the yarn quickly changes to a hydrophilic state, absorbs moisture and expands or contracts, specifically showing three behaviors according to the change of twist number;

[0043] Low twist number (0 - 150): The yarn structure is loose, with large fiber gaps. When absorbing moisture, it mainly shows lateral expansion and an increase in overall volume;

[0044] Medium twist number (150 - 250): The fiber gaps decrease. When absorbing moisture, it shows moisture absorption stasis, and the yarn density and tightness reach a dynamic balance;

[0045] High twist number (250 - 350): The yarn structure is tight, and the fiber inclination angle is close to the critical value. When absorbing moisture, the lateral expansion is limited, and it mainly shows moisture absorption contraction.

[0046] This adaptive adjustment mechanism can have different shrinkage and expansion performances in six usage scenarios. When simulating the summer sports scenario of the human body (the human body surface feels high temperature and sweat): the hydrophilic yarn absorbs moisture and expands at high temperature, causing the ply yarn to relax and undergo longitudinal shrinkage. This not only increases the friction between fibers, releases the stored elastic potential energy, but also adjusts the porosity of the fabric, promotes heat dissipation and sweat evaporation, can enhance heat dissipation when sweating, and restore a certain degree of warmth when dry;

[0047] When simulating the humid summer in the south for the human body (the human body surface feels high temperature and high humidity): the temperature-responsive thermosensitive yarn accelerates untwisting, releases the stored elastic potential energy, causing the overall shrinkage of the yarn. The hydrophilic yarn shows moisture absorption and expansion. The expansion difference between the two causes the yarn to deform in the shrinking direction in the hot and humid environment, which helps to enhance the evaporation and heat dissipation of sweat and improve wearing comfort;

[0048] When simulating the human body entering a dry indoor environment with air conditioning (the human body surface feels high temperature and low humidity): the yarn remains stationary. The thermosensitive yarn and the hydrophilic yarn cannot sense the moisture response in the low-humidity environment and maintain a comfortable body feeling, which is suitable for maintaining a comfortable body temperature;

[0049] When simulating the human body entering an air-conditioned room after exercise (the human body surface feels low temperature and sweat): the temperature-responsive yarn does not absorb moisture at low temperature and maintains heat insulation, while the hydrophilic yarn expands and absorbs moisture, promoting the export of sweat. It can not only maintain comfortable warmth at low temperature but also increase breathability and heat dissipation when sweating, thus enhancing the comfortable experience of the wearer;

[0050] When simulating the humid winter in the south for the human body (the human body surface feels low temperature and high humidity): the temperature-responsive thermosensitive yarn remains stationary or slightly expands, and the hydrophilic yarn absorbs moisture and slightly expands, which can block external moisture. At the same time, the thermosensitive yarn provides low-temperature stability and avoids the feeling of cold;

[0051] When simulating the dry winter in the north for the human body (the human body surface feels low temperature and low humidity): in the low-temperature and low-humidity environment, the yarn remains stationary, can effectively block the intrusion of cold air, avoid moisture loss, and provide good heat preservation effect;

[0052] The temperature-responsive thermosensitive yarn absorbs moisture at temperatures above 32°C. However, when the twist number is changed, it can exhibit moisture absorption and expansion - constant moisture absorption - moisture absorption and contraction. It does not absorb moisture below 32°C. When the ambient temperature is higher than the critical solution temperature (UCST, such as above 32°C), the polymer chains stretch due to intermolecular hydrogen bonding, exposing hydrophilic groups. The surface of the temperature-responsive thermosensitive yarn becomes hydrophilic, allowing it to quickly absorb and evenly disperse moisture. At low temperatures (such as below 32°C), the polymer chains contract and fold, with hydrophobic groups occupying the surface, and the fabric transforms into a hydrophobic state. The multi-stage drive muscle yarn for complex scenarios of coupled heat and humidity exhibits approximately three changes (moisture absorption and contraction - slight moisture absorption and contraction - constant moisture absorption) when the ambient humidity is different (sweat - high humidity - low humidity) at temperatures above 32°C. The multi-stage drive muscle yarn for complex scenarios of coupled heat and humidity exhibits approximately three changes (moisture absorption and expansion - slight moisture absorption and expansion - constant moisture absorption) when the ambient humidity is different (sweat - high humidity - low humidity) at temperatures below 32°C. At low temperatures, the yarn plays a role in moisturizing and heat preservation, while at high temperatures, it plays a role in quickly absorbing sweat and dissipating heat to lower the temperature.

[0053] This temperature and humidity response characteristic not only improves the comfort of the wearer but also effectively regulates the porosity of the fabric, promotes sweat evaporation, or prevents moisture intrusion. It exhibits multi-stage responses in complex coupled heat and humidity environments, can quickly adjust the structure of the yarn in high-temperature and humid or low-temperature and dry environments to achieve the desired moisture absorption, expansion, or contraction effects. This can not only enhance the heat dissipation effect but also effectively block external cold air and moisture, maintain a comfortable state on the body surface, and improve the comfort of the wearer, especially suitable for applications in sportswear, smart clothing, and high-comfort fabrics.

[0054] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage driven muscle yarn for coping with complex scenarios of heat and humidity coupling, characterized in that: The multi-stage driven muscle yarn comprises the following materials: Temperature-responsive monomers, cross-linking agents, initiators, solvents, hydrophilic yarn substrates, constant temperature water baths, vacuum ovens, ultraviolet curing chambers, mechanical twisting machines (supporting Z-twist / S-twist), and pH meters.

2. The method for preparing a multi-stage driven muscle yarn for coping with a complex scenario of coupled heat and humidity according to claim 1, wherein: S1. Yarn pretreatment: Immerse the yarn in a solution to ensure that stable reactive sites can be formed on the yarn surface. The yarn is immersed in the solution for 30 minutes to 1 hour to ensure that it completely absorbs the chemical components in the solution. Subsequently, place the yarn in a temperature-controlled environment at 60-90 °C for reaction, so that a chemical reaction occurs between the yarn surface and the siloxane coupling agent to form carbon-carbon double bonds, providing a basis for the subsequent binding of temperature-responsive monomers. After the treatment is completed, heat the yarn in a vacuum drying oven to 100-115 °C and dry it for 12 to 24 hours to ensure that the yarn is completely dry and stable; S2. Preparation of temperature-responsive monomer solution: Select a suitable temperature-responsive monomer according to needs and dissolve it in an appropriate amount of solvent. The concentration is generally controlled between 10% and 50%. To improve the binding force between the yarn and the temperature-responsive monomer, an appropriate amount of cross-linking agent (0.5%-3%) and initiator (1%-6%) are added. After mixing evenly, immerse the pretreated yarn in step S1 in the solution to ensure that the yarn is completely soaked. The soaking time is 1 to 3 hours, and the specific time depends on the absorption of the yarn to obtain a temperature-responsive yarn; S3. Ultraviolet curing treatment: The temperature-responsive yarn in step S2 is cured by ultraviolet light. The soaked yarn is pre-baked to remove excess solvent, and the yarn is heated to 70-120 °C. The baking time is controlled within 1 to 3 minutes. The yarn is exposed to ultraviolet light for curing. Under ultraviolet light irradiation, the temperature-responsive monomers undergo a polymerization reaction, and a cross-linked structure will be formed on the yarn surface, thereby endowing the yarn with controllable expansion or contraction characteristics under temperature changes; S4. Yarn twisting and doubling: Adopt the mechanical twisting method to twist and double-twist the cured temperature-responsive thermosensitive yarn and hydrophilic yarn in step S3 clockwise and counterclockwise with different twist numbers to construct a multi-level moisture absorption gradient structure. The temperature-responsive thermosensitive yarn is single-twisted and multi-strand twisted. For single-twisting, the twist number is (0-350); for multi-strand twisting, the number of strands is greater than 1, and the twist number is (0-350) to obtain a multi-stage driven muscle yarn for coping with a complex scenario of coupled heat and humidity; S5. Final treatment: After twisting and doubling are completed, wash the yarn to remove residual chemical reagents and solvents to ensure the safety and stability of the yarn. After washing, thoroughly dry the yarn and conduct performance tests, especially the heat and humidity responsiveness. The test contents include the hygroscopicity, expansibility, shrinkability of the yarn, and its stability in a humid and hot environment to ensure that the prepared yarn meets the design requirements and has good heat and humidity response capabilities.

3. The preparation method of the multi-stage driven muscle yarn for coping with the complex scenario of humidity-heat coupling according to claim 2, wherein: The pretreatment mixed solution in step s1 is made of formic acid, absolute ethanol, and siloxane coupling agent TMSPMA, prepared according to a volume ratio of 5:3:2, with a pH of 3 - 4. The hydrophilic yarn substrate can be one of cotton yarn, viscose fiber, or regenerated cellulose fiber.

4. The preparation method of the multi-stage driven muscle yarn for coping with the complex scenario of coupled humidity and heat according to claim 2, characterized in that: The temperature-responsive monomer in step s2 can be at least one of N-isopropylacrylamide, 2-(2-methoxyethoxy)ethyl 2-methyl-2-propenoate, 2-carboxyisopropylacrylamide, N,N-diethylacrylamide, N-acryloyl-N'-alkylpiperazine, N-(1-hydroxymethylpropyl)acrylamide, N-acryloylglycine amide, and [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide; The solvent can be one of absolute ethanol or trifluoroethanol; The crosslinking agent can be one of ethylene glycol dimethacrylate or N,N'-methylenebisacrylamide The initiator can be one of 2,2-diethoxyacetophenone or 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

5. The preparation method of the multi-stage driven muscle yarn for coping with the complex scenario of coupled humidity and heat according to claim 2, wherein: In step S3, the wavelength of the ultraviolet lamp is set to 365 nm, the irradiation power is 200 - 400 W, and the irradiation time is 2 to 10 minutes.

6. The preparation method of the multi-stage driven muscle yarn for coping with the complex scenario of coupled humidity and heat according to claim 2, wherein: In step S4, the single-strand muscle yarn is obtained by mechanically single-strand twisting the prepared temperature-responsive thermosensitive yarn and the hydrophilic yarn. Specifically, it includes single-strand yarn Z-twist (twist number 0 - 150), single-strand yarn Z-twist (twist number 150 - 250), single-strand yarn Z-twist (twist number 250 - 350); single-strand yarn S-twist (twist number 0 - 150), single-strand yarn S-twist (twist number 150 - 250), single-strand yarn S-twist (twist number 250 - 350); The multi-strand muscle yarn is obtained by mechanically multi-strand twisting the prepared temperature-responsive thermosensitive yarn and the hydrophilic yarn. Taking two-strand twisting as an example, a single-strand Z-twist (S-twist) temperature-responsive thermosensitive yarn (twist number 250 - 350) and a single-strand Z-twist (S-twist) hydrophilic yarn (twist number 0 - 150) are S-twisted (Z-twisted) with a ply twist number of 50 - 150; or a single-strand Z-twist (S-twist) temperature-responsive thermosensitive yarn (twist number 0 - 150) and a single-strand Z-twist (S-twist) hydrophilic yarn (twist number 250 - 350) are S-twisted (Z-twisted) with a ply twist number of 50 - 150.

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