Preparation method and application of cotton fabric loaded with polydopamine / Cu9S5

Abstract

The invention discloses a preparation method and application of a cotton fabric loaded with polydopamine / Cu9S5. According to the method, the polydopamine / Cu9S5 composite material is prepared on the cation modified cotton fabric in situ, so that the multifunctional performance is improved. The result shows that the uniform polydopamine and Cu9S5 coating is successfully constructed by the method, and the conductivity, the electromagnetic shielding performance and the ultraviolet resistance of the cotton fabric are remarkably enhanced. Specifically, when the mass ratio of the L-glutamic acid to the dopamine is 1: 1, the conductivity of the loading material can reach 0.1 S / cm, the electromagnetic shielding effectiveness is 4.3 dB, and the ultraviolet protection coefficient (UPF) is 73.51; and when the dosage of dopamine is 1.5 g, the conductivity is further improved to 0.25 S / cm, the electromagnetic shielding effectiveness is improved to 4.32 dB, and the UPF value is as high as 155.51.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles, and particularly relates to a preparation method and application of a polydopamine / Cu9S5 loaded cotton fabric. Background Art

[0002] With the rapid development of science and technology, people's demand for functional textiles has become increasingly strong. The development of multifunctional textiles with multiple application values ​​has become a hot topic in current scientific research. Among them, conductive fabrics have become a research hotspot due to their broad application prospects in many aspects such as anti-static, electromagnetic shielding and wearable equipment. As a natural cellulose fiber, cotton fiber has the advantages of good softness and biocompatibility, and is widely used in clothing, medical and home fields. However, the lack of conductivity of traditional cotton fabrics limits their application in smart textiles. Conductive cotton fabrics can combine the comfort and conductive functions of cotton to provide an ideal base material for smart textiles such as wearable sensors and health monitoring clothing. Therefore, improving the conductivity of cotton fabrics has important scientific significance and application value.

[0003] There are two main methods for preparing conductive textiles. One is the direct coating method, which is to apply a conductive material on the surface of the fabric to make the fabric conductive. This method is relatively simple, has a wide range of conductive material choices, is low in cost, and is suitable for mass production. However, it also has some disadvantages, such as the poor adhesion of the conductive material on the fabric, which is easy to fall off, and generally has poor water resistance. The second method is to dope conductive fibers into the fabric, blend ordinary fibers and conductive fibers by a certain method, and process them into conductive fabrics, but this method is costly and has a complicated preparation process, and is not suitable for mass production. Therefore, developing a method for preparing conductive cotton fabrics that has high conductivity, excellent water resistance, low cost, and can be produced on a large scale is still the focus of current research. Summary of the Invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0005] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing polydopamine / Cu9S5 loaded cotton fabric.

[0007] In order to solve the above technical problems, the present invention provides the following technical solution: a preparation method of polydopamine / Cu9S5 loaded cotton fabric, characterized in that: comprising:

[0008] Sodium hydroxide and 3-chloro-2-hydroxypropyltrimethylammonium chloride are added to deionized water to obtain solution A; cotton fabric is immersed in solution A, shaken in a constant temperature water bath, taken out, washed with deionized water, and dried to obtain modified cotton fabric;

[0009] Tris(hydroxymethyl)aminomethane and hydrochloric acid were added to deionized water to obtain a Tris-HCl buffer solution;

[0010] L-glutamic acid and dopamine were added to the buffer solution to obtain solution B;

[0011] Sodium thiosulfate and copper sulfate are added to deionized water to obtain a mixed solution;

[0012] The modified cotton fabric was immersed in solution B, shaken at room temperature, taken out, washed with deionized water, and dried, then placed in the mixed solution, shaken in a water bath, taken out, washed with deionized water, and dried to obtain polydopamine / Cu9S5 loaded cotton fabric.

[0013] As a preferred embodiment of the preparation method of the present invention, the mass volume ratio of sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and deionized water in the solution A is 1-2 g:4-6 g:100 mL.

[0014] As a preferred embodiment of the preparation method of the present invention, the mass volume ratio of tris(hydroxymethyl)aminomethane, hydrochloric acid and deionized water in the buffer solution is 1.21 g:0.4 mL:100 mL.

[0015] As a preferred embodiment of the preparation method of the present invention, the mass ratio of L-glutamic acid to dopamine is 1:2 to 2:1.

[0016] As a preferred embodiment of the preparation method of the present invention, the mass volume ratio of the sodium thiosulfate, copper sulfate and deionized water is 1.8-2.4 g:1.5-2 g:100 mL.

[0017] As a preferred embodiment of the preparation method of the present invention, the mixture is placed in a mixed solution and subjected to shaking reaction in a water bath, wherein the temperature of the water bath reaction is 60-80° C. and the pH value is 2.

[0018] As a preferred embodiment of the preparation method of the present invention, the drying temperature is 40-60°C.

[0019] Another object of the present invention is to overcome the deficiencies in the prior art and provide a polydopamine / Cu9S5 loaded cotton fabric.

[0020] Another object of the present invention is to overcome the deficiencies in the prior art and provide an application of polydopamine / Cu9S5 loaded cotton fabric in the preparation of electromagnetic shielding products.

[0021] Another object of the present invention is to overcome the deficiencies in the prior art and provide a polydopamine / Cu9S5 loaded cotton fabric for use in UV protection products.

[0022] Beneficial effects of the present invention:

[0023] (1) Conductivity and electromagnetic shielding performance: When the mass ratio of L-glutamic acid to dopamine is 1:1, the conductivity of the loaded material can reach 0.1S / cm and the electromagnetic shielding effectiveness (EMSE) is 4.3dB; when the dopamine dosage is 1.5g, the conductivity is increased to 0.25S / cm and the EMSE is further improved to 4.32dB. This result shows that the polydopamine / Cu9S5 composite material can effectively enhance the conductivity and electromagnetic interference shielding ability of cotton fabrics, meeting the requirements of smart textiles for multifunctional integration.

[0024] (2) Anti-ultraviolet performance: The ultraviolet protection factor (UPF) of the loaded material is significantly improved, reaching a maximum of 155.51, which is much higher than the 73.51 of the original cotton fabric, indicating that it has significant advantages in protecting against ultraviolet radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0026] Figure 1 This is the XRD pattern of the cotton fabric in Example 1 of the present invention.

[0027] Figure 2 The SEM photographs (1000 times) of the cotton fabrics in Examples 1 and 2 of the present invention are shown.

[0028] Figure 3 1 and 2 are EDS spectra of the cotton fabrics in Examples 1 and 2 of the present invention.

[0029] Figure 4 The following are the weight gain test results of the cotton fabrics in Examples 1, 3, and 4 of the present invention.

[0030] Figure 5These are the conductivity test results of the cotton fabrics in Examples 1, 3, and 4 of the present invention.

[0031] Figure 6 These are the electromagnetic shielding test results of the cotton fabrics in Examples 1, 3, and 4 of the present invention.

[0032] Figure 7 These are the UV protection test results of the cotton fabrics in Examples 1, 3, and 4 of the present invention.

[0033] Figure 8 The weight gain test results of the cotton fabrics in Examples 1, 5 to 7 of the present invention and Comparative Example 1 are shown.

[0034] Figure 9 The conductivity test results of the cotton fabrics in Examples 1, 5 to 7 of the present invention and Comparative Example 1 are shown.

[0035] Figure 10 These are the electromagnetic shielding test results of the cotton fabrics in Examples 1, 5 to 7 of the present invention and Comparative Example 1.

[0036] Figure 11 These are the anti-ultraviolet test results of the cotton fabrics in Examples 1, 5 to 7 of the present invention and Comparative Example 1. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0040] The materials and reagents used in the present invention are shown in Table 1.

[0041] Table 1

[0042] name Specification Manufacturer Sodium hydroxide 97%, flake Shandong Keyuan Biochemical Co., Ltd. 3-Chloro-2-hydroxypropyltrimethylammonium chloride analytically pure Shanghai Titan Chemical Co., Ltd. Dopamine hydrochloride analytically pure Shanghai Titan Chemical Co., Ltd. Copper sulfate (pentahydrate) analytically pure Shanghai MacLean Biochemical Technology Co., Ltd. Tris(hydroxymethyl)aminomethane analytically pure Shanghai Jizhi Biochemical Technology Co., Ltd. L-Glutamic Acid analytically pure Shanghai Titan Technology Co., Ltd. Sodium thiosulfate analytically pure Shanghai MacLean Biochemical Technology Co., Ltd. hydrochloric acid analytically pure Jiangsu Tongsheng Chemical Reagent Co., Ltd. sulfuric acid analytically pure Jiangsu Tongsheng Chemical Reagent Co., Ltd.

[0043] The instruments used in the examples of the present invention are shown in Table 2.

[0044] Table 2

[0045] name model Manufacturer electronic balance FR423CN Ohaus Instruments Co., Ltd. Water bath constant temperature oscillator WHY-2 Jiangsu Changzhou Huanyu Scientific Instrument Factory Gyrotron speed oscillator HY-5A Jintan Jingbo Experimental Instrument Factory Electric constant temperature blast drying oven DHG-9030A Shanghai Jinghong Experimental Equipment Co., Ltd. CNC ultrasonic cleaner KQ5200DE Kunshan Ultrasonic Instrument Co., Ltd. Textile UV resistance tester YG(B)912E Wenzhou Darong Textile Instrument Co., Ltd. Four-probe tester RTS-8 Guangzhou Four Probes Technology Co., Ltd. Digital fabric air permeability tester YG(B)461E Wenzhou Darong Textile Instrument Co., Ltd.

[0046] Cotton fabric detection method in the embodiment of the present invention:

[0047] (1) Weight gain rate: The weight gain rate of PDA / Cu9S5 cotton fabric was calculated according to the following formula.

[0048]

[0049] Where: W0 is the weight of the original cotton fabric, g; W1 is the weight of the PDA / Cu9S5 cotton fabric, g; WR is the weight gain rate, %.

[0050] (2) Structural characterization:

[0051] ① Structural Analysis: The crystalline structure of the cotton fabric was analyzed using an X'Pert3 Powder X-ray diffractometer (XRD) from PANalytical (Netherlands). The X-ray generator had a maximum output power of 3 kW, a microfocused X-ray source, and an aluminum target. The scanning angle range (2θ) and scanning speed were 5–80° and 1–2° / min, respectively.

[0052] ② Surface morphology observation: The surface morphology of the cotton fabric was observed using a FEI Nova NanoSEM 450 scanning electron microscope (SEM). Samples measuring 1 cm × 1 cm were fixed to a sample stage with conductive adhesive and then gold-sprayed. Surface morphology photographs were taken at 1000x magnification.

[0053] ③Chemical composition analysis: The types and contents of chemical elements in cotton fabrics were analyzed using AZtec X-MaxN80 energy dispersive spectrometer (EDS) from Oxford, UK.

[0054] (3) Performance testing:

[0055] Conductivity: Cotton fabric conductivity was tested using an RTS-8 four-probe tester. Preheat the power supply for 10 minutes. Place a 10cm diameter specimen flat on the test bench, ensuring good contact and a perpendicular position between the probes and the specimen surface. The current range was 10μA.

[0056] Electromagnetic Shielding: The electromagnetic shielding effectiveness of cotton fabrics was tested using the DR-913G Fabric Electromagnetic Radiation Protection Tester using the coaxial method in accordance with GJB 6190-2008, "Measurement Method for the Shielding Effectiveness of Electromagnetic Shielding Materials." The test frequency range was 0 to 3 × 109 Hz.

[0057] UV protection: The UV protection factor (UPF) of cotton fabrics was tested using a YG(B)912E textile UV protection tester in accordance with GB / T 18830-2009, "Evaluation of the UV protection properties of textiles." The test wavelength range is 290-400 nm.

[0058] Example 1

[0059] This embodiment provides a method for preparing a polydopamine / Cu9S5 loaded cotton fabric, comprising the following steps:

[0060] (1) Pretreatment of cotton fabrics:

[0061] 1.5 g of sodium hydroxide and 5 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride were added to 100 mL of deionized water to obtain solution A. Cotton fabric was immersed in solution A and shaken in a constant temperature water bath at 80° C. for 40 min. The fabric was taken out, washed with deionized water, and dried to obtain modified cotton fabric.

[0062] (2) Preparation of polydopamine-loaded / Cu9S5 cotton fabric:

[0063] 1.21 g of tris(hydroxymethyl)aminomethane and 0.4 mL of hydrochloric acid were added to 100 mL of deionized water to obtain a buffer solution.

[0064] 1.5 g of L-glutamic acid and 1.5 g of dopamine (the mass ratio of L-glutamic acid to dopamine is 1:1) were added to the buffer solution to obtain solution B;

[0065] 1.8 g of sodium thiosulfate and 1.5 g of copper sulfate were added to 100 mL of deionized water to obtain a mixed solution;

[0066] The modified cotton fabric was immersed in solution B, shaken and reacted at room temperature for 22 hours, taken out, washed with deionized water, and dried at 60°C, then placed in the mixed solution, shaken and reacted at pH = 2 and 80°C in a water bath for 1 hour, taken out, washed with deionized water, and dried at 60°C to obtain polydopamine / Cu9S5 loaded cotton fabric (PDA / Cu9S5 cotton fabric), which was recorded as PDA / Cu9S5-1.5 cotton fabric.

[0067] The original cotton fabric, modified cotton fabric and PDA / Cu9S5-1.5 cotton fabric in Example 1 were subjected to XRD analysis. The XRD patterns were as follows: Figure 1 As shown, among them, (a) original cotton fabric, (b) modified cotton fabric, and (c) PDA / Cu9S5-1.5 cotton fabric.

[0068] It can be seen that the cotton fabric presents a typical cellulose I diffraction pattern, with obvious characteristic diffraction peaks at 2θ = 15.7°, 17.1°, and 21.8°, corresponding to the (101), (10ī), and (002) crystal planes, respectively. Both the modified cotton fabric and the PDA / Cu9S5 cotton fabric have characteristic diffraction peaks of cellulose I, but the peak intensity decreases and the peak width increases, indicating that the chemical modification destroys part of the crystalline region, thereby reducing the crystallinity. The modified cotton fabric does not have new diffraction characteristic peaks, indicating that the modification of the cotton fabric with 3-chloro-2-hydroxypropyltrimethylammonium chloride mainly affects the crystallinity of cellulose. However, the PDA / Cu9S5 cotton fabric produces new characteristic diffraction peaks at 2θ = 28.3° and 46.8°, corresponding to the (102) and (110) of the Cu9S5 crystal structure, respectively, indicating the successful preparation of the PDA / Cu9S5 cotton fabric.

[0069] The cotton fabric prepared in Example 1 was subjected to a washing durability test, and the results are shown in Table 3.

[0070] Table 3

[0071] Washing (times) 5 10 15 20 25 30 Washing fastness (grade) 5 5 5 4 4 4 Conductivity (S / cm) 0.25 0.24 0.24 0.22 0.2 0.2 UPF 155 147 145 131 120 120 Electromagnetic shielding effectiveness (dB) 4.3 4.1 4.1 3.8 3.6 3.6

[0072] The results show that within a certain washing range, the electromagnetic shielding performance and physical properties of cotton fabric remain relatively stable, and its surface treatment process has a certain durability.

[0073] Example 2

[0074] The difference between this embodiment and embodiment 1 is that the mass of L-glutamic acid and dopamine in step (2) is replaced with 1 g, and the remaining steps are the same as those in embodiment 1, to obtain polydopamine-loaded / Cu9S5 cotton fabric (PDA / Cu9S5 cotton fabric), which is recorded as PDA / Cu9S5-1 cotton fabric.

[0075] The raw cotton fabric, modified cotton fabric and PDA / Cu9S5 cotton fabric among embodiment 1,2 are carried out SEM analysis, the SEM photos (1000 times) of raw cotton fabric, modified cotton fabric and PDA / Cu9S5 cotton fabric are as shown in Figure 2. Figure 2 As shown, among them, (a) original cotton fabric, (b) modified cotton fabric, (c) PDA / Cu9S5-1 cotton fabric, and (d) PDACu9S5-1.5 cotton fabric.

[0076] As can be seen from the figure, the fiber surface of the original cotton fabric is smooth and has a natural longitudinal curvature. The fiber surface of the modified cotton fabric is rougher than that of the original cotton fabric. This may be due to the local etching of the cellulose amorphous region caused by the modification with 3-chloro-2-hydroxypropyltrimethylammonium chloride. There are no obvious particles on the fiber surface of the original cotton fabric and the modified cotton fabric. Compared with the modified cotton fabric, the fiber surface of the PDA / Cu9S5 cotton fabric is rougher and has particles attached, indicating that Cu9S5 has successfully attached to the cotton fabric. Figure 2 (c) and Figure 2 (d) It can be seen that when the dosage of L-glutamic acid and dopamine is 1.5 g, the fiber surface roughness of PDA / Cu9S5 cotton fabric is larger and the attached Cu9S5 is more and denser.

[0077] The raw cotton fabric, modified cotton fabric and PDA / Cu9S5 cotton fabric among embodiment 1,2 are entered into EDS analysis, and the element content of cotton fabric is as shown in table 4, and the EDS collection of illustrative plates of raw cotton fabric, modified cotton fabric and PDA / Cu9S5 cotton fabric is as shown in table 4. Figure 3 As shown, among them, (a) original cotton fabric, (b) modified cotton fabric, (c) PDA / Cu9S5-1 cotton fabric, and (d) PDACu9S5-1.5 cotton fabric.

[0078] Table 4 Element content of cotton fabrics

[0079]

[0080] The results showed that the original cotton fabric contained carbon and oxygen, while the modified cotton fabric contained more sodium and chloride than the original cotton fabric. This is likely due to the reaction of 3-chloro-2-hydroxypropyltrimethylammonium chloride with the hydroxyl groups of the cotton fabric. The Cu and S contents of the PDA / Cu9S5 cotton fabric increased with increasing dopamine dosage, consistent with the SEM observation that the distribution of Cu9S5 particles shifted from sparse to dense. This result suggests that the in situ preparation of Cu9S5 on the cotton fabric surface is beneficial when both L-glutamic acid and dopamine dosages are 1.5 g. In summary, the successful preparation of PDA / Cu9S5 cotton fabric is demonstrated.

[0081] Example 3

[0082] The difference between this embodiment and embodiment 1 is that the mass ratio of L-glutamic acid and dopamine in step (2) is replaced with 1:2, and the remaining steps are the same as those in embodiment 1 to obtain polydopamine-loaded / Cu9S5 cotton fabric (PDA / Cu9S5 cotton fabric).

[0083] Example 4

[0084] The difference between this embodiment and embodiment 1 is that the mass ratio of L-glutamic acid and dopamine in step (2) is replaced with 2:1, and the remaining steps are the same as those in embodiment 1 to obtain polydopamine-loaded / Cu9S5 cotton fabric (PDA / Cu9S5 cotton fabric).

[0085] The weight gain test of the cotton fabrics prepared in Examples 1, 3 and 4 was performed. The results are as follows: Figure 4 As shown in the figure, it can be seen that as the mass ratio of L-glutamic acid to dopamine increases, the weight gain of cotton fabric first increases and then decreases. When the mass ratio of L-glutamic acid to dopamine is 1:1, the weight gain rate of cotton fabric is 5.7%. This shows that this ratio condition is conducive to the in situ synthesis of Cu9S5 on the cotton fabric surface.

[0086] Effect of the mass ratio of L-glutamic acid to dopamine on the conductivity of cotton fabrics Figure 5 As shown in the figure, the conductivity of the original cotton fabric is close to 0 S / cm, consistent with the insulator nature of cotton fabric. As the mass ratio of L-glutamic acid to dopamine increases, the conductivity first increases and then decreases. When the mass ratio of dopamine to L-glutamic acid is 1:1, the conductivity of the PDA / Cu9S5 cotton fabric is 0.1 S / cm, indicating good conductivity. This is likely due to the in situ synthesis of a larger amount of Cu9S5 on the cotton fabric. As the mass ratio of L-glutamic acid to dopamine increases, the conductivity decreases. This is likely because the Cu9S5 on the cotton fabric surface has completely reacted, and excess dopamine cannot further promote the formation of Cu9S5, and may even affect its structural stability, thereby reducing the conductivity of the cotton fabric.

[0087] Effect of the mass ratio of L-glutamic acid to dopamine on the electromagnetic shielding properties of cotton fabrics Figure 6 As shown in the figure, raw cotton fabric has almost no electromagnetic shielding effect due to its inherent lack of conductivity. As can be seen from the figure, when the L-glutamic acid to dopamine mass ratio is 1:1, the electromagnetic shielding properties of the PDA / Cu9S5 cotton fabric are improved; however, when the L-glutamic acid to dopamine mass ratios are 1:2 and 2:1, the electromagnetic shielding properties are almost non-existent. When the dopamine to L-glutamic acid mass ratio is 1:1, the electromagnetic shielding effectiveness of the PDA / Cu9S5 cotton fabric is 4.3 dB in the frequency range of 0.9 to 1.2 GHz, demonstrating good electromagnetic shielding properties.

[0088] Effect of the mass ratio of L-glutamic acid to dopamine on the UV resistance of cotton fabrics Figure 7As shown in the figure, the UPF value of the raw cotton fabric is the lowest, at 6.57, indicating that the raw cotton fabric has poor UV protection. The UPF values ​​of the PDA / Cu9S5 cotton fabric are all higher than those of the raw cotton. When the mass ratio of L-glutamic acid to dopamine is 1:1, the UPF value is the highest, at 73.51, indicating better UV resistance. This may be because a large amount of Cu9S5 is in situ synthesized on the cotton fabric at this time. Its unique crystal structure and optical properties can effectively absorb and reflect ultraviolet rays, thereby enhancing the cotton fabric's UV protection. As the dopamine dosage continues to increase, the cotton fabric's UPF value decreases. This may be because the excessive dopamine changes the microstructure of the cotton fabric surface, reducing the cotton fabric's UV protection effect.

[0089] Example 5

[0090] The difference between this embodiment and embodiment 1 is that the mass of dopamine in step (2) is replaced with 2 g, and the remaining steps are the same as those in embodiment 1 to obtain polydopamine-loaded / Cu9S5 cotton fabric (PDA / Cu9S5 cotton fabric).

[0091] Example 6

[0092] The difference between this embodiment and embodiment 1 is that the mass of dopamine in step (2) is replaced with 2.5 g, and the remaining steps are the same as those in embodiment 1 to obtain polydopamine-loaded / Cu9S5 cotton fabric (PDA / Cu9S5 cotton fabric).

[0093] Example 7

[0094] The difference between this embodiment and embodiment 1 is that the mass of dopamine in step (2) is replaced with 3 g, and the remaining steps are the same as those in embodiment 1 to obtain polydopamine-loaded / Cu9S5 cotton fabric (PDA / Cu9S5 cotton fabric).

[0095] Comparative Example 1

[0096] The difference between this embodiment and embodiment 1 is that dopamine is not added in step (2), and the remaining steps are the same as those in embodiment 1 to obtain Cu9S5 loaded cotton fabric (PDA / Cu9S5 cotton fabric).

[0097] The weight gain rate of the cotton fabrics prepared in Examples 1, 5 to 7 and Comparative Example 1 was tested, and the results were as follows: Figure 8 As shown in the figure, as the dopamine dosage increases, the weight gain of the cotton fabric first increases and then decreases. When the dopamine dosage is 1.5g, the weight gain rate is 9.1%, and a large amount of Cu9S5 is generated on the cotton fabric. The dopamine dosage of 1.5g is conducive to the in situ synthesis of Cu9S5 on cotton fabric.

[0098] Effect of dopamine dosage on the conductivity of cotton fabrics Figure 9As shown in the figure, as the dopamine dosage increases, the conductivity of the cotton fabric first increases and then decreases. When the dopamine dosage reaches 1.5g, the conductivity reaches a maximum of 0.25S / cm, indicating good conductivity. Further increases in dopamine dosage lead to a decrease in conductivity, indicating that by the time the dopamine dosage reaches 1.5g, Cu9S5 has formed a complete conductive network on the cotton fabric surface, eliminating the need for further dopamine dosage.

[0099] Effect of dopamine dosage on electromagnetic shielding properties of cotton fabrics Figure 10 As shown. Figure 10 It can be seen that when the dopamine dosage is 1-2g, the electromagnetic shielding properties of PDA / Cu9S5 cotton fabric are improved, while when the dopamine dosage is 2-3g, the electromagnetic shielding properties of PDA / Cu9S5 cotton fabric are almost non-existent. In the frequency range of 0-1.5GHz, the electromagnetic shielding properties of PDA / Cu9S5-1 cotton fabric are slightly better than those of PDA / Cu9S5-1.5 cotton fabric. In the frequency range of 1.5-3GHz, the electromagnetic shielding properties of PDA / Cu9S5-1 cotton fabric and PDA / Cu9S5-1.5 cotton fabric are not significantly different.

[0100] Effect of dopamine dosage on UV resistance of cotton fabrics Figure 11 As shown in the figure, the UPF values ​​of the PDA / Cu9S5 cotton fabric are higher than those of the original cotton fabric, indicating good UV protection. As the dopamine dosage increases, the UPF value of the cotton fabric first increases and then decreases. When the dopamine dosage is 1.5g, the cotton fabric has a maximum UPF value of 155.51, indicating good UV protection.

[0101] The present invention achieves enhanced multifunctional performance by in-situ preparing a polydopamine / Cu9S5 composite material on a cationic modified cotton fabric. The results show that this method successfully constructs a uniform polydopamine and Cu9S5 coating, significantly enhancing the electrical conductivity, electromagnetic shielding performance, and UV resistance of the cotton fabric. Specifically, when the mass ratio of L-glutamic acid to dopamine is 1:1, the conductivity of the loaded material can reach 0.1S / cm, the electromagnetic shielding effectiveness is 4.3dB, and the ultraviolet protection factor (UPF) is 73.51; when the dopamine dosage is 1.5g, the conductivity is further increased to 0.25S / cm, the electromagnetic shielding effectiveness is increased to 4.32dB, and the UPF value is as high as 155.51.

[0102] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit 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 spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the present invention.

Claims

1. A method for preparing a polydopamine / Cu9S5 loaded cotton fabric, characterized in that: include, Sodium hydroxide and 3-chloro-2-hydroxypropyltrimethylammonium chloride are added to deionized water to obtain solution A; cotton fabric is immersed in solution A, shaken in a constant temperature water bath, taken out, washed with deionized water, and dried to obtain modified cotton fabric; Tris(hydroxymethyl)aminomethane and hydrochloric acid were added to deionized water to obtain a Tris-HCl buffer solution; L-glutamic acid and dopamine were added to the buffer solution to obtain solution B; Sodium thiosulfate and copper sulfate are added to deionized water to obtain a mixed solution; The modified cotton fabric was immersed in solution B, shaken at room temperature, taken out, washed with deionized water, and dried, then placed in the mixed solution, shaken in a water bath, taken out, washed with deionized water, and dried to obtain polydopamine / Cu9S5 loaded cotton fabric.

2. The preparation method according to claim 1, wherein: The mass volume ratio of sodium hydroxide, 3-chloro-2-hydroxypropyltrimethylammonium chloride and deionized water in the solution A is 1-2 g: 4-6 g: 100 mL.

3. The preparation method according to claim 1, wherein: The mass volume ratio of tris(hydroxymethyl)aminomethane, hydrochloric acid and deionized water in the buffer solution is 1.21 g:0.4 mL:100 mL.

4. The preparation method according to claim 1, wherein: The mass ratio of the L-glutamic acid to dopamine is 1:2 to 2:

1.

5. The preparation method according to claim 5, wherein: The mass volume ratio of the sodium thiosulfate, copper sulfate and deionized water is 1.8-2.4 g:1.5-2 g:100 mL.

6. The preparation method according to claim 1, wherein: The mixture is placed in the mixed solution and shaken in a water bath for reaction, wherein the temperature of the water bath reaction is 60-80° C. and the pH value is 2.

7. The preparation method according to claim 1, wherein: The drying temperature is 40-60°C.

8. Polydopamine / Cu9S5 loaded cotton fabric prepared by the preparation method according to any one of claims 1 to 7.

9. Use of the polydopamine / Cu9S5 loaded cotton fabric as claimed in claim 8 in the preparation of electromagnetic shielding products.

10. Use of the polydopamine / Cu9S5 loaded cotton fabric as claimed in claim 8 in UV protection products.

Images