Fatigue-resistant high-elasticity polyamide-acrylic blended core-spun yarn and preparation method thereof

Abstract

This invention belongs to the field of polymer fiber materials technology and discloses a fatigue-resistant and highly elastic nylon-acrylic blended core-spun yarn and its preparation method. The core yarn comprises nylon resin, acrylic resin, a synergistically modified topological network elastomer, 1,3,5-tris(hydroxymethyl)benzene, zirconium chloride, and deionized water; wherein the synergistically modified topological network elastomer is a three-dimensional dynamic topological network structure synergistically constructed from dopamine, octa(3-aminopropyl)silsesquioxane, and 2,5-dihydroxyterephthalaldehyde. The preparation method includes mixing, melt blending spinning, and coating spinning steps. By constructing a network structure with multiple dynamic crosslinking and topological confinement synergistic effects, and introducing small organic molecules with multi-hydroxyl structures, energy dissipation and reversible structural reconstruction under cyclic loading are achieved, thereby significantly improving the fatigue resistance, elastic recovery performance, and structural stability of the core-spun yarn. This material is suitable for high-durability textiles and functional fibers.

Description

Technical Field

[0001] This invention belongs to the field of polymer fiber materials technology, specifically relating to a fatigue-resistant and highly elastic nylon-acrylic blended core-spun yarn and its preparation method. Background Technology

[0002] Nylon fiber possesses excellent mechanical strength, abrasion resistance, and fatigue resistance, and is widely used in high-strength textile materials. Acrylic fiber, on the other hand, exhibits good bulkiness, weather resistance, and dimensional stability. Blending nylon and acrylic fibers to prepare core-spun yarn structures can balance strength and appearance to a certain extent, thus showing broad application prospects in functional textiles and industrial yarns.

[0003] However, existing nylon-acrylic blended core-spun yarns still suffer from problems such as rapid decline in elastic recovery rate, insufficient fatigue life, and poor structural stability under long-term cyclic loading or repeated stretching conditions. The main reason for this is that traditional modification methods mainly rely on simple physical blending or single chemical crosslinking, making it difficult to effectively control chain segment movement at the molecular scale. Furthermore, it is difficult to construct a dynamic network structure capable of energy dissipation and structural recovery under external forces, thus limiting the material's performance in high-frequency applications.

[0004] In addition, the functional additives used in existing technologies are mostly conventional plasticizers, crosslinking agents or inorganic fillers, lacking novel small organic molecules that can form multi-point effects in the fiber system and participate in structural reconstruction. It is difficult to significantly improve the elastic recovery ability and fatigue resistance of the material while maintaining its strength.

[0005] Therefore, there is an urgent need to develop a new nylon-acrylic blended core-spun yarn. By introducing a synergistic modification system with structural regulation function and novel organic small molecules, a multi-scale synergistic network can be constructed at the molecular level, thereby achieving simultaneous improvement in the material's fatigue resistance and high elastic recovery performance. Summary of the Invention

[0006] To overcome the problems of low elastic recovery rate, insufficient fatigue resistance, and poor structural stability in nylon-acrylic blended core-spun yarns mentioned above, the present invention aims to provide a fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn and its preparation method. This is achieved by introducing a synergistically modified topological network elastomer into the core yarn system and combining it with 1,3,5-tris(hydroxymethyl)benzene, an organic small molecule not previously used in this field, to construct a composite structural system with multiple dynamic crosslinking and topological confinement synergistic effects. The present invention introduces a synergistically modified topological network elastomer composed of dopamine, octa(3-aminopropyl)silsesquioxane, and 2,5-dihydroxyterephthalaldehyde into the nylon and acrylic matrix, while simultaneously introducing 1,3,5-tris(hydroxymethyl)benzene and metal coordination components. Through melt blending spinning and cover spinning processes, a blended core-spun yarn with a core-shell structure is formed. By constructing a multi-scale dynamic synergistic network structure, the present invention achieves energy dissipation and reversible structural reconstruction of the material under cyclic loading, thereby significantly improving the elastic recovery and fatigue resistance of the core-spun yarn.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A fatigue-resistant and highly elastic nylon-acrylic blended core-spun yarn, wherein the core yarn comprises the following raw materials in parts by weight: 80-120 parts nylon resin; 40-100 parts acrylic resin; 10-40 parts synergistically modified topological network elastomer; 2-10 parts 1,3,5-tris(hydroxymethyl)benzene; 0.5-5 parts zirconium chloride; and 20-80 parts deionized water. The synergistically modified topological network elastomer is a three-dimensional dynamic topological network structure material formed by the oxidative self-polymerization of dopamine to form an interfacial adhesion layer, and synergistically constructed with octa(3-aminopropyl)silsesquioxane through Schiff base condensation reaction and coordination crosslinking under the action of 2,5-dihydroxyterephthalaldehyde.

[0009] Optionally, the synergistically modified topological network elastomer comprises the following raw materials in parts by weight: 5-20 parts of dopamine; 2-12 parts of octa(3-aminopropyl)silsesquioxane; 1-8 parts of 2,5-dihydroxyterephthalaldehyde; 0.5-5 parts of zirconium chloride; and 20-80 parts of deionized water.

[0010] Optionally, the method for preparing the synergistically modified topological network elastomer includes the following steps:

[0011] (1) Dopamine is added to deionized water to react and obtain a dopamine prepolymer system;

[0012] (2) Add octa(3-aminopropyl)silsesquioxane and 2,5-dihydroxy-terephthalaldehyde to the dopamine prepolymer system to react and obtain an intermediate modified system;

[0013] (3) Add zirconium chloride to the intermediate modified system to react and obtain a synergistically modified topological network elastomer.

[0014] Optionally, the reaction conditions in step (1) are as follows: the pH is adjusted to 8.5-9.0 using a tris(hydroxymethyl)aminomethane buffer solution, and the reaction is carried out at a constant temperature of 25-35°C for 1.5-2.5 h in the presence of oxygen, with a stirring speed of 200-400 r / min.

[0015] Optionally, the reaction conditions in step (2) are as follows: the temperature is raised to 70-85°C under nitrogen protection, the reaction time is 3-5 hours, the stirring speed is 400-600 r / min, and the solid content of the system is controlled to be 10%-25%.

[0016] Optionally, the reaction conditions in step (3) are to heat the system to 80-100°C for reaction, the reaction time is 4-7 h, the stirring speed is 300-500 r / min, and the pH of the system is controlled to be 6.0-7.5.

[0017] Optionally, a method for preparing a fatigue-resistant and highly elastic nylon-acrylic blended core-spun yarn includes the following steps:

[0018] S1, Nylon resin, Acrylic resin, synergistically modified topological network elastomer, 1,3,5-tris(hydroxymethyl)benzene, zirconium chloride and deionized water are mixed to obtain a uniform spinning raw material system.

[0019] S2 involves melt-blending and extruding the spinning raw material system, and then spinning it to form the core fiber.

[0020] S3 uses acrylic staple fiber as the covering fiber, which is wrapped around the outside of the core fiber through a spinning process to obtain nylon-acrylic blended core-spun yarn.

[0021] Optionally, the reaction conditions in step S1 are as follows: mixing is carried out at 40-60°C for 20-60 min, stirring speed is 300-600 r / min, and the water content of the system is controlled at 5%-15%.

[0022] Optionally, the reaction conditions for step S2 are: melt blending temperature of 230–260°C, extrusion speed of 60–120 rpm, spinning draw ratio of 3–6 times, and air cooling.

[0023] Optionally, the reaction conditions in step S3 are: a coating ratio of 30% to 70% during spinning, a spinning tension of 0.2 to 0.6 cN / dtex, and a winding speed of 300 to 800 m / min.

[0024] The beneficial effects of this invention are:

[0025] This invention constructs a topological network structure formed by a dopamine interface adhesion layer, octa(3-aminopropyl)silsesquioxane rigid nanonodes, and dynamic Schiff base bonds of 2,5-dihydroxyterephthalaldehyde. This structure enables the material to undergo reversible fracture and recombination under external forces, effectively dispersing stress concentration and significantly improving structural stability under cyclic loading. Simultaneously, 1,3,5-tris(hydroxymethyl)benzene, an organic small molecule not previously used in this field, is introduced. Its multi-hydroxyl structure constructs a multi-point dynamic hydrogen bond network between molecular chains, enabling energy dissipation during stretching and rapid recovery of the molecular chain configuration during unloading, thus significantly improving elastic recovery rate. The coordination crosslinking formed by zirconium chloride further enhances the synergistic effect between network nodes, improving the overall density and creep resistance of the system. This allows the core-spun yarn to maintain excellent mechanical properties and fatigue resistance under high-frequency cyclic deformation conditions, achieving a synergistic improvement in high elasticity and high durability. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Figure 1 The infrared spectra of nylon-acrylic blended core-spun yarn and synergistically modified topological network elastomer are compared. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.

[0029] Example 1: The purpose of this example is to verify the basic properties and molding feasibility of the material under the condition that all components and process parameters are at the lower limit.

[0030] S1. Add 5 parts of dopamine to 20 parts of deionized water, adjust the pH to 8.5 using tris(hydroxymethyl)aminomethane buffer solution, and react at 25°C for 1.5 h with stirring at 200 r / min in the presence of oxygen to obtain a dopamine prepolymer system. Then add 2 parts of octa(3-aminopropyl)silsesquioxane and 1 part of 2,5-dihydroxyterephthalaldehyde, and react at 70°C for 3 h under nitrogen protection with stirring at 400 r / min, controlling the solid content of the system to 10%. Then add 0.5 parts of zirconium chloride, and react at 80°C for 4 h with stirring at 300 r / min, controlling the pH to 6.0 to obtain a synergistically modified topological network elastomer.

[0031] S2, 80 parts of nylon resin, 40 parts of acrylic resin, 10 parts of synergistic modified topological network elastomer, 2 parts of 1,3,5-tris(hydroxymethyl)benzene, 0.5 parts of zirconium chloride, and 20 parts of deionized water were mixed at 40°C for 30 min with a stirring speed of 300 r / min and the water content of the system was controlled at 5% to obtain a spinning raw material system; then, melt blending extrusion was carried out at 230°C with an extrusion speed of 60 rpm and a spinning draw ratio of 3 times, and air cooling was used to form the core fiber;

[0032] S3, using acrylic staple fiber as the coating fiber, coating spinning is carried out under the conditions of a coating ratio of 30%, a spinning tension of 0.2cN / dtex, and a winding speed of 300m / min to obtain nylon-acrylic blended core-spun yarn.

[0033] Example 2: The purpose of this example is to verify that the overall performance of the material is optimal when the components and reaction conditions are within a moderate range.

[0034] S1, 12 parts of dopamine were added to 50 parts of deionized water, and the pH was adjusted to 8.8 using tris(hydroxymethyl)aminomethane buffer solution. The mixture was stirred at 30°C for 2 hours in the presence of oxygen, with a stirring speed of 300 r / min, to obtain a dopamine prepolymer system. Subsequently, 7 parts of octa(3-aminopropyl)silsesquioxane and 4 parts of 2,5-dihydroxyterephthalaldehyde were added, and the mixture was heated to 80°C for 4 hours under nitrogen protection, with a stirring speed of 500 r / min, and the solid content of the system was controlled to be 18%. Then, 3 parts of zirconium chloride were added, and the mixture was heated to 90°C for 5 hours, with a stirring speed of 400 r / min, and the pH was controlled to be 6.8, to obtain a synergistically modified topological network elastomer. Figure 1 For the unmodified sample at 3400cm -1 At 1720 cm⁻¹, only weak OH or NH absorption peaks are observed. -1 The presence of a distinct C=O characteristic peak nearby indicates that the system is dominated by the original polymer structure; after modification, a peak at 3400 cm⁻¹ is observed. -1 The absorption peak at 1650 cm⁻¹ is significantly enhanced and broadened, indicating enhanced hydrogen bonding. -1 The appearance of a new C=N characteristic peak at 1100 cm⁻¹ indicates the successful formation of a Schiff base structure; -1 The Si-O-Si absorption peak is significantly enhanced at 600–700 cm⁻¹. -1 The presence of Zr-O coordination characteristic peaks within the range indicates the successful introduction of inorganic nodes and coordination structures; in summary, the modified system forms a synergistic network structure with multiple dynamic cross-links.

[0035] S2, 100 parts of nylon resin, 70 parts of acrylic resin, 25 parts of synergistic modified topological network elastomer, 6 parts of 1,3,5-tris(hydroxymethyl)benzene, 3 parts of zirconium chloride, and 50 parts of deionized water were mixed at 50°C for 40 min with a stirring speed of 450 r / min and the water content of the system was controlled at 10% to obtain a spinning raw material system; then, melt blending extrusion was carried out at 245°C with an extrusion speed of 90 rpm and a spinning draw ratio of 4.5 times, and air cooling was used to form the core fiber;

[0036] S3, using acrylic staple fiber as the coating fiber, coating spinning is carried out under the conditions of a coating ratio of 50%, a spinning tension of 0.4cN / dtex, and a winding speed of 500m / min to obtain nylon-acrylic blended core-spun yarn.

[0037] Example 3: The purpose of this example is to verify the changing trend of material properties under conditions of high addition amount and high process strength.

[0038] S1. 20 parts of dopamine were added to 80 parts of deionized water, and the pH was adjusted to 9.0 using a tris(hydroxymethyl)aminomethane buffer solution. The mixture was stirred at 35°C for 2.5 hours in the presence of oxygen at a stirring speed of 400 r / min to obtain a dopamine prepolymer system. Subsequently, 12 parts of octa(3-aminopropyl)silsesquioxane and 8 parts of 2,5-dihydroxyterephthalaldehyde were added, and the mixture was heated to 85°C for 5 hours under nitrogen protection at a stirring speed of 600 r / min, with the solid content of the system controlled at 25%. Then, 5 parts of zirconium chloride were added, and the mixture was heated to 100°C for 7 hours at a stirring speed of 500 r / min, with the pH controlled at 7.5 to obtain a synergistically modified topological network elastomer.

[0039] S2, 120 parts of nylon resin, 100 parts of acrylic resin, 40 parts of synergistic modified topological network elastomer, 10 parts of 1,3,5-tris(hydroxymethyl)benzene, 5 parts of zirconium chloride, and 80 parts of deionized water were mixed at 60°C for 60 min with a stirring speed of 600 r / min and the water content of the system was controlled at 15% to obtain a spinning raw material system; then, melt blending extrusion was carried out at 260°C with an extrusion speed of 120 rpm and a spinning draw ratio of 6 times, and air cooling was used to form the core fiber;

[0040] S3, using acrylic staple fiber as the coating fiber, coating spinning is carried out under the conditions of a coating ratio of 70%, a spinning tension of 0.6 cN / dtex, and a winding speed of 800 m / min to obtain nylon-acrylic blended core-spun yarn.

[0041] Comparative Example 1: The purpose of this comparative example is to verify the effect of using only a single dopamine modification system on the material properties.

[0042] S1, 12 parts of dopamine were added to 50 parts of deionized water, and the pH was adjusted to 8.8 using tris(hydroxymethyl)aminomethane buffer solution. The mixture was stirred at 30°C for 2 hours in the presence of oxygen, with a stirring speed of 300 r / min, to obtain the dopamine prepolymer system. Without adding octa(3-aminopropyl)silsesquioxane, 2,5-dihydroxyterephthalaldehyde, and zirconium chloride, it was used directly as a single modification system.

[0043] S2, 100 parts of nylon resin, 70 parts of acrylic resin, 25 parts of the above single modified system, 6 parts of 1,3,5-tris(hydroxymethyl)benzene, 3 parts of zirconium chloride, and 50 parts of deionized water were mixed at 50°C for 40 min with a stirring speed of 450 r / min and the water content of the system was controlled at 10% to obtain a spinning raw material system; then, melt blending and extrusion were carried out at 245°C with an extrusion speed of 90 rpm and a spinning draw ratio of 4.5 times, and air cooling was used to form the core fiber;

[0044] S3, using acrylic staple fiber as the coating fiber, coating spinning is carried out under the conditions of a coating ratio of 50%, a spinning tension of 0.4cN / dtex, and a winding speed of 500m / min to obtain nylon-acrylic blended core-spun yarn.

[0045] Comparative Example 2: The purpose of this comparative example is to verify the changes in material properties when a dynamic topological cross-linking structure is missing.

[0046] S1, 12 parts of dopamine were added to 50 parts of deionized water, and the pH was adjusted to 8.8 using tris(hydroxymethyl)aminomethane buffer solution. The mixture was stirred at 30°C for 2 hours in the presence of oxygen at a stirring speed of 300 r / min to obtain a dopamine prepolymer system. Subsequently, 7 parts of octa(3-aminopropyl)silsesquioxane were added for reaction. The mixture was heated to 80°C and reacted for 4 hours under nitrogen protection at a stirring speed of 500 r / min. 2,5-Dihydroxyterephthalaldehyde and zirconium chloride were not added to obtain a two-component modified system.

[0047] S2, 100 parts of nylon resin, 70 parts of acrylic resin, 25 parts of the above two-component modified system, 6 parts of 1,3,5-tris(hydroxymethyl)benzene, 3 parts of zirconium chloride, and 50 parts of deionized water were mixed at 50°C for 40 min with a stirring speed of 450 r / min and the water content of the system was controlled at 10% to obtain a spinning raw material system; then, melt blending and extrusion were carried out at 245°C with an extrusion speed of 90 rpm and a spinning draw ratio of 4.5 times, and air cooling was used to form the core fiber;

[0048] S3, using acrylic staple fiber as the coating fiber, coating spinning is carried out under the conditions of a coating ratio of 50%, a spinning tension of 0.4cN / dtex, and a winding speed of 500m / min to obtain nylon-acrylic blended core-spun yarn.

[0049] Comparative Example 3: The purpose of this comparative example is to verify the changes in material properties when 1,3,5-tris(hydroxymethyl)benzene is not introduced.

[0050] S1, 12 parts of dopamine were added to 50 parts of deionized water, and the pH was adjusted to 8.8 using tris(hydroxymethyl)aminomethane buffer solution. The mixture was stirred at 30°C for 2 hours in the presence of oxygen, with a stirring speed of 300 r / min, to obtain a dopamine prepolymer system. Subsequently, 7 parts of octa(3-aminopropyl)silsesquioxane and 4 parts of 2,5-dihydroxyterephthalaldehyde were added, and the mixture was heated to 80°C for 4 hours under nitrogen protection, with a stirring speed of 500 r / min, and the solid content of the system was controlled to be 18%. Then, 3 parts of zirconium chloride were added, and the mixture was heated to 90°C for 5 hours, with a stirring speed of 400 r / min, and the pH was controlled to be 6.8, to obtain a synergistically modified topological network elastomer.

[0051] S2, 100 parts of nylon resin, 70 parts of acrylic resin, 25 parts of synergistic modified topological network elastomer, 3 parts of zirconium chloride, and 50 parts of deionized water were mixed at 50°C for 40 min with a stirring speed of 450 r / min. The water content of the system was controlled at 10%, and 1,3,5-tris(hydroxymethyl)benzene was not added to obtain the spinning raw material system. Subsequently, melt blending and extrusion were carried out at 245°C with an extrusion speed of 90 rpm and a spinning draw ratio of 4.5 times. Air cooling was used to form the core fiber.

[0052] S3, using acrylic staple fiber as the coating fiber, coating spinning is carried out under the conditions of a coating ratio of 50%, a spinning tension of 0.4cN / dtex, and a winding speed of 500m / min to obtain nylon-acrylic blended core-spun yarn.

[0053] Performance testing:

[0054] 1. Cyclic tensile fatigue performance test: The prepared nylon-acrylic blended core-spun yarn was cut into specimens with a length of 200 mm and tested on an electronic universal testing machine. The tensile speed was set to 100 mm / min. The specimens were repeatedly stretched to 50% of their original length and then returned to the initial length. This process was repeated 10,000 times. After the test, the fracture strength of the specimens was measured and compared with the initial fracture strength before the test. The strength retention rate was calculated to evaluate the fatigue resistance of the material under long-term cyclic loading.

[0055] 2. Elastic recovery performance test: Fix the specimen on the tensile testing device, stretch the specimen to 100% of its original length at a speed of 100 mm / min, hold for 10 seconds and then unload it to allow it to naturally recover to a stable state. Record the length after recovery. Repeat the above stretching and recovery process 5 times, take the average value, and calculate the ratio of the recovered length to the original length to evaluate the elastic recovery ability of the material.

[0056] 3. Creep resistance test: The specimen is fixed in a constant temperature environment, with the temperature controlled at 25℃. A constant load equivalent to 30% of its fracture strength is applied to the specimen and the loading is continued for 1 hour. The maximum deformation during the loading process is recorded. After unloading, the specimen is allowed to stand for another 30 minutes. The length change after recovery is recorded. The proportion of recovered deformation to total deformation is calculated to evaluate the creep resistance of the material under continuous stress conditions.

[0057] 4. Wear resistance test: The sample is fixed on the reciprocating friction tester and subjected to reciprocating friction under a load of 5N. The friction stroke is 10mm, the friction speed is 60 times / min, and the total number of friction cycles is 5000. The sample is weighed before and after the test, the mass loss rate is calculated, and the wear degree of the fiber surface is observed to evaluate the wear resistance of the material.

[0058] Table 1 Performance Test Results

[0059] sample Fatigue strength retention rate % elastic recovery rate % Creep recovery rate % Quality loss rate % Example 1 84 86 82 2.8 Example 2 96 97 94 1.5 Example 3 91 92 89 2.0 Comparative Example 1 68 72 65 4.6 Comparative Example 2 75 78 72 3.9 Comparative Example 3 80 83 78 3.2

[0060] As shown in Table 1, the performance indicators of Examples 1-3 are significantly better than those of Comparative Examples 1-3, indicating that the introduction of synergistically modified topological network elastomers and small organic molecules can significantly improve the overall performance of nylon-acrylic blended core-spun yarn. Among them, Example 2 achieved a fatigue strength retention rate of 96%, an elastic recovery rate of 97%, a creep recovery rate of 94%, and the lowest mass loss rate of only 1.5%, indicating that the material performance is optimal under moderate formulation conditions.

[0061] Further analysis revealed that Comparative Example 1, lacking a synergistic modified topological network structure and relying solely on single dopamine modification, lacked effective multi-point crosslinking and energy dissipation mechanisms, leading to structural damage during cyclic stretching and significantly reduced fatigue strength retention and elastic recovery rates. Comparative Example 2, although introducing some modified components, failed to form a complete three-dimensional network structure due to the lack of key dynamic Schiff base structures and coordination crosslinking effects. While its performance improved somewhat, it remained significantly lower than that of the Example. Comparative Example 3, while possessing a synergistic network structure, lacked the introduction of 1,3,5-tris(hydroxymethyl)benzene, resulting in insufficient energy dissipation and recovery capabilities, thus lower elastic recovery and creep recovery rates than the Example.

[0062] Furthermore, Examples 1 and 3 correspond to low and high addition conditions, respectively. Although both are better than the comparative example, their performance is slightly lower than that of Example 2. This indicates that there is an optimal range for the content of the synergistically modified topological network elastomer and organic small molecules. When the content is too low, the network structure is not perfect, while when the content is too high, it may lead to excessive rigidity of the system or excessive cross-linking of the structure, thereby affecting the reversible movement ability of the molecular chain segments.

[0063] In summary, this invention, by constructing a network structure with synergistic effects of multiple dynamic cross-linking and topological confinement, and introducing small organic molecules with multi-point hydrogen bonding, achieves energy dissipation and reversible structural reconstruction of the material under cyclic loading. This significantly improves the fatigue resistance, elastic recovery performance, and structural stability of nylon-acrylic blended core-spun yarn, and has promising application prospects.

Claims

1. A fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn, characterized in that, The core yarn comprises the following raw materials in parts by weight: 80-120 parts of nylon resin; 40-100 parts of acrylic resin; 10-40 parts of synergistic modified topological network elastomer; 2-10 parts of 1,3,5-tris(hydroxymethyl)benzene; 0.5-5 parts of zirconium chloride; and 20-80 parts of deionized water. The synergistic modified topological network elastomer is a three-dimensional dynamic topological network structure material formed by the oxidative self-polymerization of dopamine to form an interfacial adhesion layer, and the synergistic construction of octa(3-aminopropyl)silsesquioxane with Schiff base condensation reaction and coordination crosslinking under the action of 2,5-dihydroxyterephthalaldehyde.

2. The fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn according to claim 1, characterized in that, The synergistically modified topological network elastomer comprises the following raw materials in parts by weight: 5-20 parts dopamine; 2-12 parts octa(3-aminopropyl)silsesquioxane; 1-8 parts 2,5-dihydroxyterephthalaldehyde; 0.5-5 parts zirconium chloride; and 20-80 parts deionized water.

3. A fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn according to claim 1 or 2, characterized in that, The method for preparing the synergistically modified topological network elastomer includes the following steps: (1) Dopamine is added to deionized water to react and obtain a dopamine prepolymer system; (2) Add octa(3-aminopropyl)silsesquioxane and 2,5-dihydroxy-terephthalaldehyde to the dopamine prepolymer system to react and obtain an intermediate modified system; (3) Add zirconium chloride to the intermediate modified system to react and obtain a synergistically modified topological network elastomer.

4. The fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn according to claim 3, characterized in that, The reaction conditions for step (1) are as follows: pH is adjusted to 8.5-9.0 using tris(hydroxymethyl)aminomethane buffer solution, and the reaction is carried out at a constant temperature of 25-35°C for 1.5-2.5 hours in the presence of oxygen, with a stirring speed of 200-400 r / min.

5. The fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn according to claim 3, characterized in that, The reaction conditions for step (2) are as follows: the temperature is raised to 70-85°C under nitrogen protection, the reaction time is 3-5 hours, the stirring speed is 400-600 r / min, and the solid content of the system is controlled to be 10%-25%.

6. The fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn according to claim 3, characterized in that, The reaction conditions for step (3) are to heat the system to 80-100℃ for reaction, the reaction time is 4-7h, the stirring speed is 300-500r / min, and the pH of the system is controlled to be 6.0-7.

5.

7. A process for the production of a high-elasticity, fatigue-resistant, polyamide- acrylic blend core-spun yarn, characterized in that, The preparation method includes the following steps: S1, Nylon resin, Acrylic resin, synergistically modified topological network elastomer, 1,3,5-tris(hydroxymethyl)benzene, zirconium chloride and deionized water are mixed to obtain a uniform spinning raw material system. S2 involves melt-blending and extruding the spinning raw material system, and then spinning it to form the core fiber. S3 uses acrylic staple fiber as the covering fiber, which is wrapped around the outside of the core fiber through a spinning process to obtain nylon-acrylic blended core-spun yarn.

8. The method of claim 7, wherein the method is characterized by the steps of: The reaction conditions for step S1 are as follows: mixing is carried out at 40-60°C for 20-60 min, stirring speed is 300-600 r / min, and the water content of the system is controlled at 5%-15%.

9. The method of claim 7, wherein the method is characterized by the steps of: The reaction conditions for step S2 are: melt blending temperature of 230-260℃, extrusion speed of 60-120 rpm, spinning draw ratio of 3-6 times, and air cooling.

10. The method for preparing a fatigue-resistant, highly elastic nylon-acrylic blended core-spun yarn according to claim 7, characterized in that, The reaction conditions for step S3 are: a coating ratio of 30% to 70% during spinning, a spinning tension of 0.2 to 0.6 cN / dtex, and a winding speed of 300 to 800 m / min.

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