A core-spun silk fabric composite material and its preparation method and application

Abstract

The present invention belongs to the technical field of functional materials, and particularly relates to a core-spun silk fabric composite material, and its preparation method and application. A core-spun silk fabric composite material comprises a substrate layer, a silver nanowire layer, and a polydopamine layer in sequence; the substrate layer comprises a core-spun silk fabric. The present invention achieves modification of the core-spun silk fabric through the polydopamine layer and the silver nanowire layer, so that the core-spun silk fabric composite material has good flexibility, conductivity, stability, and antibacterial properties. When it is applied to a fabric sensor, it not only meets the physical and mechanical properties of the sensor, but also maintains the feel and flexibility of the fabric. In addition, the preparation process of the present invention is simple, the source of reaction raw materials is wide, the raw material cost is low, the preparation process is pollution-free, and it is convenient for industrial production.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional materials, and in particular relates to a core-spun silk fabric composite material and a preparation method and application thereof. Background Art

[0002] As electronic products gradually develop towards miniaturization, integration and flexibility, people's demand for wearable textiles is also increasing, which in turn makes textiles gradually develop towards functionalization, intelligence and electronicization. Therefore, the new generation of textiles that combine electronic components and traditional textiles, namely electronic textiles, has become a current research hotspot.

[0003] At present, new conductive fibers are mainly obtained by functionalizing various single polymer fibers or fabric matrices. However, the polymer matrices used in the prior art are mostly PET fibers (polyester fibers, commonly known as polyester), and the ductility of PET fibers is limited, resulting in the inability of the conductive fibers prepared by functionalization to have both flexibility and conductivity. Core-spun silk is a new type of coaxial fiber. It is a new type of fiber based on the "skin-core" coaxial structure of two polymer materials prepared through a special melt spinning technology. This type of fiber can usually combine the advantages of two polymer materials and is the preferred material for the new generation of fabrics. Although core-spun silk fabrics are widely used, there are no technical reports on the functionalization of core-spun silk fabrics in the prior art, nor are there any public studies on flexible sensors based on core-spun silk fabrics.

[0004] Therefore, there is an urgent need to provide a core-spun silk fabric composite material that can well balance flexibility and conductivity, has good antibacterial properties and stability, and has a simple preparation method and low cost. Summary of the Invention

[0005] The present invention aims to solve one or more technical problems existing in the prior art and at least provide a beneficial alternative or create conditions. The present invention provides a core-spun silk fabric composite material that can well balance flexibility and conductivity, has good antibacterial properties and stability, and is prepared by a simple and low-cost method.

[0006] The inventive concept of the present invention: The core-spun silk fabric composite material of the present invention comprises a substrate layer, a silver nanowire layer, and a polydopamine layer in sequence; the substrate layer comprises a core-spun silk fabric. The core-spun silk fabric is modified by a polydopamine layer (PDA) and a silver nanowire layer (AgNWs layer). Among them, a conductive network that contacts and penetrates each other is formed between the AgNWs, so that the core-spun silk fabric composite material has good conductive properties, and at the same time, it can also make the core-spun silk fabric composite material have good antibacterial properties, further improving the functionality of the core-spun silk fabric composite material. The introduction of the conductive polydopamine layer further improves the conductivity of the core-spun silk fabric and increases its sensitivity as a strain sensor. In addition, polydopamine has good biocompatibility and is closer to human skin. When it is applied to a fabric sensor, it maintains the feel and flexibility of the fabric while meeting the physical and mechanical properties of the sensor. More importantly, polydopamine forms a "protective film" on the AgNWs layer, which can significantly reduce the shedding of AgNWs, thereby protecting the conductive network and improving the stability of the core-spun silk fabric composite material. This enables the core-spun silk fabric composite material to have a good balance between flexibility and conductivity, thereby extending the service life of the core-spun silk fabric composite material as a flexible sensor.

[0007] Therefore, a first aspect of the present invention provides a core-spun silk fabric composite material.

[0008] Specifically, a core-spun silk fabric composite material comprises a substrate layer, a silver nanowire layer, and a polydopamine layer in sequence; the substrate layer comprises the core-spun silk fabric.

[0009] Preferably, the surface of the substrate layer contains fibers; and the fibers contain silver nanowires.

[0010] Specifically, the AgNWs include AgNWs in the silver nanowire layer, AgNWs embedded in the fiber gaps of the substrate layer, and AgNWs embedded in the molecular structure of the core-spun silk fibers after swelling; that is, the AgNWs are attached to and embedded in the fiber gaps and molecular structure on the surface of the core-spun silk fabric, which not only makes the three-dimensional conductive network coverage wider and effectively improves the conductive performance, but also when the AgNWs are embedded in the fiber gaps and molecular structure on the surface of the core-spun silk fabric, the AgNWs will be more stable and not easy to fall off, thereby ensuring the stability and durability of the core-spun silk fabric composite material.

[0011] Preferably, the mass percentage of the silver nanowires in the silver nanowire layer and the silver nanowires in the substrate layer is 45-75:25-55.

[0012] More preferably, the mass percentage of the silver nanowires in the silver nanowire layer and the silver nanowires in the substrate layer is 50-70:30-50.

[0013] Preferably, the aspect ratio of the AgNWs is 900-1650.

[0014] Further preferably, the aspect ratio of the AgNWs is 1000-1500.

[0015] Preferably, the polydopamine layer is formed by polydopamine molecules formed by self-polymerization of dopamine molecules.

[0016] The second aspect of the present invention provides a method for preparing the core-spun silk fabric composite material according to the first aspect of the present invention.

[0017] Specifically, the method for preparing the core-spun silk fabric composite material comprises the following steps:

[0018] (1) distributing the AgNWs dispersion on the surface of the substrate layer, vacuum filtering, and drying to obtain an AgNWs-core-spun silk fabric;

[0019] (2) placing the AgNWs-core-spun silk fabric obtained in step (1) in a dopamine buffer solution, reacting, and drying to obtain the core-spun silk fabric composite material.

[0020] Specifically, in step (1), the AgNWs dispersion is distributed on the surface of the substrate layer, and after vacuum filtration, part of the AgNWs is embedded in the fiber gaps and molecular structure on the surface of the core-spun silk fabric.

[0021] Preferably, in step (1), the AgNWs dispersion is a dispersion formed by dispersing AgNWs in a solvent; the solvent comprises at least one of isopropanol, water, and ethanol.

[0022] Preferably, the ratio of the core-spun silk fabric to the AgNWs dispersion is 16-36 cm 2 :0.35-0.65mL.

[0023] Further preferably, the ratio of the core-spun silk fabric to the AgNWs dispersion is 16-36 cm 2 :0.4-0.6mL.

[0024] Preferably, the filter paper used in the vacuum filtration is a filter paper with nanopore size.

[0025] Preferably, the vacuum filtration time is 4.5-17 min; further preferably, the vacuum filtration time is 5-15 min.

[0026] Preferably, the drying temperature is 65-95° C., and the drying time is 18-35 minutes.

[0027] More preferably, the drying temperature is 75-85° C., and the drying time is 20-30 min.

[0028] Preferably, in step (2), the dopamine buffer solution is obtained by dissolving the dopamine reagent in a buffer solution; the dosage ratio of the AgNWs-core-spun silk fabric, the dopamine reagent, and the buffer solution is: 16-36 cm 2 :0.04g:15-25mL.

[0029] Further preferably, the dosage ratio of the AgNWs-core-spun silk fabric, dopamine reagent, and buffer solution is: 16-36 cm 2 :0.04g:18-22mL.

[0030] Preferably, the buffer solution is a Tris buffer solution.

[0031] Preferably, the Tris buffer solution is obtained by dissolving Tris reagent in water.

[0032] Preferably, the water is purified water.

[0033] Preferably, the usage ratio of the Tris reagent to water is 8-22 g:100 mL.

[0034] More preferably, the usage ratio of the Tris reagent to water is 10-20 g:100 mL.

[0035] Preferably, the pH of the buffer solution is 8-9.

[0036] Preferably, the pH of the buffer solution is adjusted by aqueous citric acid solution.

[0037] Preferably, in step (2), the reaction temperature is 12-35° C.; the reaction is carried out while stirring; the stirring time is 5.5-7.5 h, and the stirring speed is 160-250 rpm.

[0038] Further preferably, in step (2), the reaction temperature is 15-30°C; the reaction is stirred while the reaction is carried out; the stirring time is 6-7h, and the stirring speed is 180-220rpm.

[0039] Preferably, in step (2), the drying temperature is 12-35° C., and the drying time is 20-130 min.

[0040] Further preferably, in step (2), the drying temperature is 15-30° C., and the drying time is 25-120 min.

[0041] Preferably, in step (2), the drying is performed under vacuum conditions.

[0042] A third aspect of the present invention provides a fabric sensor.

[0043] Specifically, the fabric sensor includes the core-spun silk fabric composite material described in the first aspect of the present invention.

[0044] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0045] (1) The core-spun silk fabric composite material of the present invention comprises a substrate layer, a silver nanowire layer, and a polydopamine layer in sequence; the substrate layer comprises a core-spun silk fabric; the core-spun silk fabric is modified by the polydopamine layer and the silver nanowire layer, so that the core-spun silk fabric composite material has good flexibility, conductivity, stability, and antibacterial properties, and further, when it is applied to a fabric sensor, it not only meets the physical and mechanical properties of the sensor, but also maintains the feel and flexibility of the fabric.

[0046] (2) The AgNWs in the AgNWs layer of the present invention have a high aspect ratio. The AgNWs are attached to and embedded in the surface of the core-spun silk fabric composite material, which not only makes the three-dimensional conductive network cover a wider range and improves the conductive performance, but also when embedded in the fiber pores and fiber molecular structure of the core-spun silk fabric, the AgNWs are more stable and not easy to fall off, thereby ensuring the stability of the core-spun silk fabric composite material.

[0047] (3) The polydopamine layer of the present invention has good biocompatibility and is closer to human skin. It forms a "protective film" on the AgNWs layer, which can significantly reduce the shedding of AgNWs, thereby protecting the conductive network, making the core-spun silk fabric composite material longer in service life and having good stability.

[0048] (4) The preparation process of the present invention is simple, the sources of reaction raw materials are wide, the raw material cost is low, and the preparation process is pollution-free and convenient for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the preparation process of the core-spun silk fabric composite material according to Example 1 of the present invention;

[0050] Figure 2 The stress-strain curves of the materials prepared in Example 1 and Comparative Examples 1-3 of the present invention are shown;

[0051] Figure 3 The resistance change rate-strain curves of the materials prepared in Example 1 and Comparative Example 3 of the present invention are shown;

[0052] Figure 4This is a 100-cycle stretching curve of CSY / AgNWs / PDA prepared in Example 1 of the present invention;

[0053] Figure 5 The scanning electron microscope images of the materials prepared in Example 1 and Comparative Example 3 of the present invention are shown;

[0054] Figure 6 This is the elemental analysis diagram of CSY / AgNWs / PDA prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0055] In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the following examples are given for illustration. It should be noted that the following examples do not limit the scope of protection claimed by the present invention.

[0056] Unless otherwise specified, the raw materials, reagents, or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0057] Example 1

[0058] A core-spun silk fabric composite material comprises a core-spun silk fabric, a silver nanowire layer, and a polydopamine layer in sequence; the aspect ratio of the AgNWs is 1100.

[0059] A method for preparing a core-spun silk fabric composite material comprises the following steps:

[0060] (1) Cut the commercial core-spun yarn (CSY) into 4×4cm 2 , obtaining CSY core-spun silk fabric;

[0061] (2) Using a syringe, 0.4 mL of the isopropanol dispersion of AgNWs was evenly dropped onto the surface of the CSY core-spun silk fabric obtained in step (1). The mixture was vacuum filtered for 10 min to allow the AgNWs in the isopropanol dispersion to adhere to and embed onto the surface of the CSY core-spun silk fabric. The mixture was then dried at 80°C for 20 min to obtain a CSY / AgNWs composite material.

[0062] (3) Dissolve 15 g of Tris reagent in 100 mL of purified water, and adjust the amount of citric acid aqueous solution to obtain a buffer solution with a pH of 8.5; dissolve 0.04 g of dopamine reagent in 20 mL of the buffer solution to obtain a dopamine buffer solution;

[0063] (4) placing the CSY / AgNWs composite material obtained in step (2) in the dopamine buffer solution obtained in step (3), stirring at 20° C. and 200 rpm for 6 h to allow it to fully react, coating a polydopamine layer on the surface of the CSY / AgNWs composite material, and obtaining a precursor of the core-spun silk fabric composite material;

[0064] (5) The precursor of the core-spun silk fabric composite material obtained in step (4) was placed in a vacuum drying oven at 25° C. and vacuum-dried for 30 minutes to obtain a core-spun silk fabric composite material (CSY / AgNWs / PDA).

[0065] A schematic diagram of the preparation process of the core-spun silk fabric composite material according to Example 1 of the present invention is shown in FIG. Figure 1 shown.

[0066] Example 2

[0067] A core-spun silk fabric composite material comprises a core-spun silk fabric, a silver nanowire layer, and a polydopamine layer in sequence; the aspect ratio of the AgNWs is 1000.

[0068] A method for preparing a core-spun silk fabric composite material comprises the following steps:

[0069] (1) Cut the commercial core-spun yarn (CSY) into 5×5cm 2 , obtaining CSY core-spun silk fabric;

[0070] (2) Using a syringe, measure 0.5 mL of the isopropanol dispersion of AgNWs and evenly drop it on the surface of the CSY core-spun silk fabric obtained in step (1). Vacuum filter for 10 min to allow the AgNWs in the isopropanol dispersion to adhere to and embed on the surface of the CSY core-spun silk fabric. Dry the mixture at 80°C for 25 min to obtain a CSY / AgNWs composite material.

[0071] (3) Dissolve 15 g of Tris reagent in 100 mL of purified water, and adjust the amount of citric acid aqueous solution to obtain a buffer solution with a pH of 8; dissolve 0.04 g of dopamine reagent in 20 mL of the buffer solution to obtain a dopamine buffer solution;

[0072] (4) placing the CSY / AgNWs composite material obtained in step (2) in the dopamine buffer solution obtained in step (3), stirring at 210 rpm for 6.5 h at 20° C. to allow it to fully react, coating a polydopamine layer on the surface of the CSY / AgNWs composite material, and obtaining a precursor of the core-spun silk fabric composite material;

[0073] (5) The precursor of the core-spun silk fabric composite material obtained in step (4) was placed in a vacuum drying oven at 20° C. and vacuum-dried for 40 minutes to obtain a core-spun silk fabric composite material (CSY / AgNWs / PDA).

[0074] Example 3

[0075] A core-spun silk fabric composite material comprises a core-spun silk fabric, a silver nanowire layer, and a polydopamine layer in sequence; the aspect ratio of the AgNWs is 1300.

[0076] A method for preparing a core-spun silk fabric composite material comprises the following steps:

[0077] (1) Cut the commercial core-spun yarn (CSY) into 6×6cm 2 , obtaining CSY core-spun silk fabric;

[0078] (2) Using a syringe, 0.6 mL of the isopropanol dispersion of AgNWs was evenly dropped onto the surface of the CSY core-spun silk fabric obtained in step (1). The mixture was vacuum filtered for 5 min to allow the AgNWs in the isopropanol dispersion to adhere to and embed onto the surface of the CSY core-spun silk fabric. The mixture was then dried at 80°C for 25 min to obtain a CSY / AgNWs composite material.

[0079] (3) Dissolve 15 g of Tris reagent in 100 mL of purified water, and adjust the amount of citric acid aqueous solution to obtain a buffer solution with a pH of 9; dissolve 0.04 g of dopamine reagent in 20 mL of the buffer solution to obtain a dopamine buffer solution;

[0080] (4) placing the CSY / AgNWs composite material obtained in step (2) in the dopamine buffer solution obtained in step (3), stirring at 30° C. and 220 rpm for 7 h to allow it to fully react, coating a polydopamine layer on the surface of the CSY / AgNWs composite material, and obtaining a precursor of the core-spun silk fabric composite material;

[0081] (5) The precursor of the core-spun silk fabric composite material obtained in step (4) was placed in a vacuum drying oven at 30° C. and vacuum-dried for 25 minutes to obtain a core-spun silk fabric composite material (CSY / AgNWs / PDA).

[0082] Comparative Example 1

[0083] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 only contains step (1) of Example 1 without any other treatment, and thus obtains CSY core-spun silk fabric.

[0084] Comparative Example 2

[0085] The difference between Comparative Example 2 and Example 1 is that the core-spun silk fabric composite material of Comparative Example 2 does not contain the AgNWs layer, that is, the preparation does not include step (2) of Example 1, and the polydopamine layer is directly plated on the surface of the core-spun silk fabric. The rest is the same as Example 1.

[0086] Specifically, the preparation method of the core-spun silk fabric composite material of Comparative Example 2 comprises the following steps:

[0087] (1) Cut the commercial Core-Spun-Yarn (CSY) into 4×4cm 2 , obtaining CSY core-spun silk fabric;

[0088] (2) Dissolve 15 g of Tris reagent in 100 mL of purified water, and adjust the amount of citric acid aqueous solution to obtain a buffer solution with a pH of 8.5; dissolve 0.04 g of dopamine reagent in 20 mL of the buffer solution to obtain a dopamine buffer solution;

[0089] (3) placing the CSY core-spun silk fabric obtained in step (1) in the dopamine buffer solution obtained in step (2), stirring at a stirring speed of 200 rpm for 6 hours to allow it to fully react, and coating a polydopamine layer on the surface of the CSY core-spun silk fabric to obtain a precursor of the core-spun silk fabric composite material;

[0090] (4) The precursor of the core-spun silk fabric composite material obtained in step (3) was placed in a vacuum drying oven at 25° C. and vacuum-dried for 30 minutes to obtain a composite material (CSY / PDA).

[0091] Comparative Example 3

[0092] The difference between Comparative Example 3 and Example 1 is that the core-spun silk fabric composite material of Comparative Example 3 does not contain a polydopamine (PDA) layer, that is, steps (3), (4), and (5) of Example 1 are not included during preparation, and the rest are the same as Example 1. Specifically, the preparation method of the core-spun silk fabric composite material of Comparative Example 3 includes the following steps:

[0093] (1) Cut the commercial Core-Spun-Yarn (CSY) into 4×4cm 2 , obtaining CSY core-spun silk fabric;

[0094] (2) 0.4 mL of the isopropanol dispersion of AgNWs was measured with a syringe and evenly dropped onto the surface of the CSY core-spun silk fabric obtained in step (1). The mixture was vacuum filtered for 10 min to allow the AgNWs in the isopropanol dispersion to adhere to and embed on the surface of the CSY core-spun silk fabric. The mixture was dried at 80°C for 20 min to obtain a composite material (CSY / AgNWs).

[0095] Performance Testing

[0096] 1. Stress-strain testing

[0097] The present invention is tested according to the test method disclosed in the document (Qin Y, Qu M, Pan Y, et al. Fabrication, Characterization and Modelling of Triple Hierarchic PET / CB / TPU Composite Fibers for Strain Sensing [J]. Composites Part A Applied Science and Manufacturing, 2019, 129: 105724.), and the materials obtained in Example 1 and Comparative Examples 1-3 are uniaxially stretched to fracture at a speed of 60 mm / min, and the change in the tensile force required for the material is recorded. The stress-strain curves of the materials obtained in Example 1 and Comparative Examples 1-3 are as follows. Figure 2 As shown. Wherein, the horizontal axis strain represents strain (%), and the vertical axis stress represents stress, the unit is MPa. Figure 2 It can be seen that the elongation at break of the materials prepared in Example 1 and Comparative Examples 1-3 all exceeded 300%, indicating that the CSY fiber has super tensile properties; and the elongation at break of the CSY / AgNWs / PDA prepared in Example 1 reached 400%, indicating that the core-spun silk fabric composite material of the present invention has excellent flexibility.

[0098] 2. Resistance change rate-strain test

[0099] According to the test method disclosed in the literature (Qin Y, Qu M, Pan Y, et al. Fabrication, Characterization and Modelling of Triple Hierarchic PET / CB / TPU Composite Fibers for Strain Sensing [J]. Composites Part A Applied Science and Manufacturing, 2019, 129: 105724.), the CSY / AgNWs / PDA material prepared in Example 1 of the present invention and the CSY / AgNWs material prepared in Comparative Example 3 were stretched to fracture at a speed of 60 mm / min, and the change in the resistance of the material was recorded. The resistance change rate-strain curves of the materials in Example 1 and Comparative Example 3 are as shown in FIG. Figure 3 As shown, the horizontal axis strain represents the strain (%), and the vertical axis RCR represents the resistance change rate. Figure 3 in Figure 3 (a) is an enlarged view of the resistance change rate curve in the strain range of 0-100.

[0100] Wherein, RCR is based on the method disclosed in the literature (Y.Zheng et al.The effect of filler dimensionality on the electromechanical performance of polydimethylsiloxane based conductive nanocomposites for flexible strain sensors, Composites Science and Technology, 2017, 139: 64-73) (i.e., R0 is the initial resistance of the sample).

[0101] Wherein, the sensitivity GF is based on the method disclosed in the literature (ZF Liu et al. Hierarchically buckled sheath-core fibers for superelastic electronics, sensors, and muscles, Science, 2015, 349 (6246): 400-404) (i.e. ), the sensitivity indicates the rate of change of the resistance of the sample under the same strain, that is, the greater the sensitivity, the greater the rate of change of the resistance of the sample under the same strain.

[0102] from Figure 3 It can be seen that for the CSY / AgNWs material of Comparative Example 3, i.e., the core-spun silk fabric without the PDA layer, when the strain reaches 150%, the unprotected AgNWs are seriously damaged, and the resistance signal exceeds the range of the picoammeter instrument (greater than 10 9Ohm), and lost its function as a sensor; while the material of Example 1, that is, using PDA as a coating layer to protect AgNWs, has a correspondingly increased resistance change rate with the increase of strain, and has different sensitivities in different areas. It is worth noting that when the strain of CSY / AgNWs / PDA is as high as nearly 600%, the resistance signal can still be detected. In summary, the CSY / AgNWs / PDA material of the present invention has the excellent performance required for the sensor, with a maximum sensitivity of 66.8 and a maximum detectable strain of 584%, both of which are higher than the level of the currently reported prior art. Among them, the sensitivity and detectable strain of the best material in the prior art are 61.8 and 130%, respectively (reference documents: Zhang, P.; Chen, Y.; Li, Y.; Zhang, Y.; Zhang, J.; Huang, L., A flexible strain sensor based on the porous structure of a carbonblack / carbon nanotube conducting network for human motion detection. Sensors 2020, 20 (4), 1154.).

[0103] 3. Cyclic tensile test

[0104] The CSY / AgNWs / PDA material strips (4×4 cm 2 ) is clamped at the upper and lower ends of a machine with an intercept of 30 mm in a taut state. The intercept of the machine is adjusted to 27.5 mm (the spline is in a relaxed and slightly curved state at this time). The spline is stretched 100 times at a speed of 240 mm / min while the intercept of the machine changes from 27.5 mm to 55 mm and from 55 mm to 27.5 mm. The results of the 100-cycle stretching test are shown in the figure. Figure 4 As shown in the figure, the horizontal axis Cycle No. represents the number of cycles, and the vertical axis RCR represents the resistance change rate. Figure 4 (a) and (b) are enlarged views of the corresponding positions in Figure (4). Figure 4 It can be seen that the macroscopic detection signal of the CSY / AgNWs / PDA material prepared in Example 1 of the present invention has good long-term repeatability, indicating that the core-spun silk fabric composite material prepared in the present invention has good stability.

[0105] 4. Scanning Electron Microscope Observation

[0106] The materials prepared in Example 1 and Comparative Example 3 were observed and analyzed using a scanning electron microscope. Figure 5 As shown. Among them, Figure 5 (a) SEM image of CSY prepared in Comparative Example 1; Figure 5 (b) (c) are scanning electron micrographs of CSY / AgNWs prepared in Comparative Example 3; Figure 5 (d) is a scanning electron microscopy image of CSY / AgNWs / PDA prepared in Example 1. Figure 5 (a) No treatment was performed and it can be used as a blank control group to observe the effects of other treatments on the material microstructure. Figure 5 After the CSY in (b) and (c) is treated with the isopropyl alcohol dispersion of AgNWs, the surface of CSY is evenly covered with AgNWs. Although the AgNWs are already located on the surface of CSY, they are not stable on the surface of CSY. This is because although the silver nanowires have been introduced to the fiber surface through the swelling effect of the core-spun silk fabric, they are still in a relatively prominent position. When the material is used for a long time, cyclically stretched, or the surface is subjected to friction, the introduced silver nanowires will fall off very easily. This indirectly shows that attaching the PDA layer on the outside of the AgNWs layer plays an important role in the stability of the AgNWs layer. Figure 5 (d) A clear PDA layer was observed between the CSY fibers. The PDA layer covered the surface of the core-spun silk fabric covered with AgNWs, which could protect the conductive network channels and extend the service life of the core-spun silk fabric composite material of the present invention.

[0107] 5. Elemental Analysis

[0108] The CSY / AgNWs / PDA material of Example 1 of the present invention was subjected to elemental determination using Element Mapping. The results are as follows: Figure 6 As shown in Table 1. The horizontal axis Energy represents energy, the vertical axis cps represents counts per second, that is, the counts per second using the relative photoelectron flux intensity, which is used to evaluate the number of atoms of the corresponding element, and Map in the figure represents the distribution map.

[0109] Table 1: Elemental analysis results

[0110]

[0111]

[0112] from Figure 6 From the element analysis results in Table 1, it can be seen that AgNWs are introduced into the core-spun silk fabric composite material of the present invention. The conductive function of the core-spun silk fabric composite material is achieved by introducing AgNWs, and the proportion of AgNWs can be reflected.

[0113] 6. Antibacterial performance test

[0114] The antibacterial property test of the CSY / AgNWs / PDA prepared in Example 1 was conducted, mainly testing the antibacterial effect of CSY / AgNWs / PDA against Escherichia coli and Staphylococcus aureus, and the test was conducted with reference to GB / T20944.3-2008.

[0115] Test results showed that the CSY / AgNWs / PDA prepared in Example 1 exhibited an antibacterial rate of greater than 99% against both Escherichia coli and Staphylococcus aureus, meeting the requirements of Section 12.5 of GB / T 20944.3-2008, "Evaluation of Antimicrobial Properties of Textiles - Part 3: Oscillation Method." This demonstrates that the core-spun silk fabric composite material of the present invention possesses excellent antimicrobial properties.

[0116] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A core-spun silk fabric composite material, characterized in that: It is composed of a substrate layer, a silver nanowire layer, and a polydopamine layer in sequence; the substrate layer is a core-spun silk fabric; The preparation method of the core-spun silk fabric composite material comprises the following steps: (1) distributing a dispersion of silver nanowires on the surface of the substrate layer, vacuum filtering, and drying to obtain a silver nanowire-core-spun silk fabric; (2) placing the silver nanowire-core-spun silk fabric obtained in step (1) in a dopamine buffer solution, reacting, and drying to obtain the core-spun silk fabric composite material; In step (1), the dispersion of silver nanowires is distributed on the surface of the substrate layer. After vacuum filtration, part of the silver nanowires are embedded in the fiber gaps and molecular structures on the surface of the core-spun silk fabric.

2. The core-spun silk fabric composite material according to claim 1, characterized in that: The mass percentages of the silver nanowires in the silver nanowire layer and the silver nanowires in the substrate layer are 45-75:25-55.

3. The core-spun silk fabric composite material according to claim 1, characterized in that: The aspect ratio of the silver nanowires is 900-1650.

4. The core-spun silk fabric composite material according to claim 1, characterized in that: In step (1), the dispersion of silver nanowires is a dispersion formed by dispersing silver nanowires in a solvent; the solvent includes at least one of isopropyl alcohol, water, and ethanol.

5. The core-spun silk fabric composite material according to claim 1, characterized in that: In step (1), the ratio of the core-spun silk fabric to the silver nanowire dispersion is 16-36 cm 2 :0.35-0.65mL.

6. The core-spun silk fabric composite material according to claim 1, characterized in that: In step (2), the dopamine buffer solution is obtained by dissolving the dopamine reagent in the buffer solution; the amount ratio of the silver nanowire-core-spun silk fabric, the dopamine reagent, and the buffer solution is: 16-36cm 2 :0.04g:15-25mL.

7. The core-spun silk fabric composite material according to claim 1, characterized in that: In step (2), the reaction temperature is 12-35° C.; the reaction is carried out while stirring; the stirring time is 5.5-7.5 h, and the stirring speed is 160-250 rpm.

8. A fabric sensor, characterized in that: The core-spun silk fabric composite material comprises the core-spun silk fabric composite material according to any one of claims 1 to 7.

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