A flexible conductive yarn and its preparation method and application

Abstract

The application discloses a kind of flexible conductive yarn and its preparation method and application;The method comprises the following steps: S1, hexanediamine solution, conductive carbon material solution and alkali solution are mixed to obtain aqueous solution;Aqueous solution and oil phase monomer solution are mixed to carry out interfacial polymerization reaction to obtain film;S2, the film is stretched, and after removing organic solvent, twist, drying are obtained to obtain conductive yarn;The composition of the oil phase monomer solution includes adipoyl chloride.The conductive yarn prepared by the method has the effects of good elasticity, high strength and good conductivity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite materials, in particular to a flexible conductive yarn and a preparation method and application thereof. BACKGROUND

[0002] With the rapid development of science and technology, intelligent textiles and wearable technology have gradually become the focus of attention, and in this field, conductive yarn as its core basic material plays a vital role. At present, the methods commonly used for preparing conductive fibers or yarns on the market include coating technology, blending of conductive materials and chemical fiber spinning, and electrospinning technology. However, the thickness of the coating layer is not easy to control, and it is easy to fall off, and the yarn feels hard; the blending of conductive nanomaterials and spinning leads to uneven distribution of materials, insufficient strength, and brittle yarns; electrospinning technology is difficult to ensure the strength of the conductive fiber, and it is not easy to mass-produce.

[0003] Therefore, it is of great significance to prepare a conductive yarn with good elasticity, high strength and good conductivity. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect of the present application provides a preparation method of a flexible conductive yarn, which has good elasticity, high strength and good conductivity.

[0005] The second aspect of the present application also provides a flexible conductive yarn.

[0006] The third aspect of the present application also provides an application of a flexible conductive yarn.

[0007] The preparation method of a flexible conductive yarn according to the first aspect of the present application comprises the following steps:

[0008] S1, mixing hexanediamine solution, conductive carbon material solution and alkali solution to obtain an aqueous phase solution; mixing the aqueous phase solution and an oil phase monomer solution to perform interfacial polymerization reaction to obtain a thin film;

[0009] S2, stretching the thin film, twisting and drying after removing the organic solvent to obtain a conductive yarn;

[0010] The composition of the oil phase monomer solution includes adipoyl chloride.

[0011] The preparation method according to the embodiments of the present application has at least the following beneficial effects:

[0012] The application uses hexanediamine and graphene as the water phase solution, uses adipamide as the oil phase solution, slowly pours the oil phase solution into the water phase solution, makes the two polymerize at the interface, and stretches and twists the obtained film to obtain the conductive yarn.

[0013] This is because the application first uses specific hexanediamine and adipoyl chloride as the raw material for polymerization, and can have excellent elasticity and strength.

[0014] On the other hand, the conductive carbon material is in the water phase solution, and uses the interfacial polymerization technology to make the conductive carbon material stably and uniformly distributed in the yarn, and improves the conductivity of the conductive yarn.

[0015] According to some embodiments of the application, the mass concentration of the conductive carbon material solution is 3% to 10%. For example, the mass concentration of the conductive carbon material solution according to the application is 3%, 5%, 8%, 10%, or any sub-range composed of two of them.

[0016] When the concentration of the conductive carbon material solution is less than 3%, the conductivity of the conductive yarn will be affected; if the concentration of the conductive carbon material solution is higher than 10%, the strength of the conductive yarn will be affected. Therefore, the conductive yarn prepared within the above range has good conductivity and breaking strength.

[0017] According to some embodiments of the application, the conductive carbon material in the conductive carbon material solution is selected from at least one of graphene, carbon nanotube, conductive carbon black, or conductive carbon fiber.

[0018] According to some embodiments of the application, the mass concentration of the hexanediamine solution in the water phase solution is 3% to 5%.

[0019] According to some embodiments of the application, the mass concentration of adipoyl chloride in the oil phase monomer solution is 1.5% to 5%.

[0020] According to some embodiments of the application, the temperature of the interfacial polymerization reaction of the water phase solution and the oil phase monomer solution is 10°C to 30°C.

[0021] According to some embodiments of the application, the time of the interfacial polymerization reaction is 1 to 20 seconds.

[0022] According to some embodiments of the application, the twist factor of the twisting is 100 to 250.

[0023] According to some embodiments of the application, the twist factor is calculated by the following formula:

[0024] α=t*T^(1 / 2);

[0025] Wherein, a - twist coefficient; t - twist, twist / 10cm; T - yarn linear density, tex.

[0026] According to some embodiments of the present application, the organic solvent in the oil phase monomer solution is selected from at least one of n-hexane, cyclohexane, n-heptane, n-octane or n-pentane.

[0027] According to some embodiments of the present application, the base in the base solution is selected from at least one of sodium hydroxide, potassium hydroxide, calcium hydroxide or barium hydroxide.

[0028] According to some embodiments of the present application, in step S2, the method for removing the organic solvent is mixing, heating and soaking the stretched film with deionized water.

[0029] According to some embodiments of the present application, the heating temperature is 40-60℃.

[0030] According to the second aspect of the present application, a flexible conductive yarn is provided, which is prepared by the preparation method of the first aspect of the present application.

[0031] Thus, the prepared conductive yarn has good elasticity, high strength and good conductivity.

[0032] The third aspect of the present application provides an application of the above-mentioned flexible conductive yarn in electromagnetic shielding materials, antistatic materials, smart textiles or wearable devices.

[0033] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0035] Figure 1 is a flowchart of embodiment 1 of the present application;

[0036] Figure 2 is a SEM image of the flexible conductive yarn prepared in embodiment 1 of the present application;

[0037] Figure 3 is a SEM image of the yarn prepared in comparative example 1. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present application, and the technical solutions of the present application are further described in conjunction with the embodiments, but the present application is not limited to these embodiments.

[0039] The reagents, methods and apparatus employed in the present application are conventional in the art unless otherwise specified.

[0040] Some raw materials in the embodiments of the present application are as follows:

[0041] Hexanediamine: purchased from Macklin reagent;

[0042] Adipoyl chloride: purchased from Macklin reagent;

[0043] Conductive carbon material: graphene (CAS No. 7782-42-5); commercially available.

[0044] Example 1

[0045] The present example provides a flexible conductive yarn, Figure 1 The flowchart is a schematic diagram, and the preparation method is as follows:

[0046] Hexanediamine solution: a hexanediamine solution with a mass concentration of 4.0% is prepared;

[0047] Sodium hydroxide solution: a sodium hydroxide solution with a concentration of 3% is prepared;

[0048] Graphene solution: a graphene solution with a mass concentration of 10% is prepared;

[0049] Oil phase monomer solution: adipoyl chloride and n-hexane are mixed to obtain an oil phase monomer solution with a mass concentration of 3.2%.

[0050] S1, mix the hexanediamine solution, sodium hydroxide solution and graphene solution to obtain an aqueous phase solution; slowly pour the oil phase monomer solution into the aqueous phase solution at 25°C, and perform interfacial polymerization for 10s to obtain a black film;

[0051] S2, manually stretch the black film, and immerse the stretched filament-like film in water at 50°C for 30min; take out the dried film filament, twist it (twist factor is 114), and dry it at 80°C for 10min to obtain a conductive yarn.

[0052] Example 2

[0053] The present example provides a flexible conductive yarn, and the preparation method is basically the same as that of Example 1, except that the mass concentration of the graphene solution is 8%.

[0054] Example 3

[0055] The present example provides a flexible conductive yarn, and the preparation method is basically the same as that of Example 1, except that the mass concentration of the graphene solution is 5%.

[0056] Example 4

[0057] This example provides a flexible conductive yarn, the preparation method of which is basically the same as in Example 1, except that the mass concentration of the graphene solution is 3%.

[0058] Example 5

[0059] This example provides a flexible conductive yarn, the preparation method of which is basically the same as in Example 1, except that the mass concentration of the graphene solution is 12%.

[0060] Example 6

[0061] This example provides a flexible conductive yarn, the preparation method of which is basically the same as that in Example 1, except that: the mass concentration of hexamethylenediamine solution is 2.0%, the mass concentration of sodium hydroxide is 1.4%, the soaking time is 30 min, and the twisting coefficient is 154.

[0062] Example 7

[0063] This example provides a flexible conductive yarn, the preparation method of which is basically the same as that in Example 1, except that: the mass concentration of the oil phase monomer solution is 4.5%, the soaking time is 35 min, and the twisting coefficient is 210.

[0064] Comparative Example 1

[0065] This example provides a flexible conductive yarn, the preparation method of which is basically the same as in Example 1, except that the aqueous solution does not contain graphene solution.

[0066] Comparative Example 2

[0067] This example provides a flexible conductive yarn, which is prepared in basically the same way as in Example 1, except that piperazine is used instead of hexamethylenediamine.

[0068] Comparative Example 3

[0069] This example provides a flexible conductive yarn, which is prepared in a manner basically the same as in Example 1, except that isophthaloyl chloride is used instead of adipyl chloride.

[0070] Performance testing

[0071] The conductive yarn prepared in Example 1 of this invention was subjected to SEM testing, and the results are as follows: Figure 2 As shown, where Figure 2 a is a partial topographic image. Figure 2 b is an overall morphological diagram of the conductive yarn, from Figure 2 It can be observed that the conductive yarn with added graphene has a high porosity.

[0072] The yarn prepared in Comparative Example 1 was subjected to SEM testing, and the results are as follows: Figure 3 As shown, where Figure 3a is a partial topographic image. Figure 3 b is an overall morphological diagram of the conductive yarn, from Figure 3 It can be observed that, in comparison, the interfacial polymerized yarn without graphene has fewer pores on its surface, indicating that the yarn without graphene has a compact structure, resulting in a lower porosity.

[0073] Furthermore, the conductive yarns prepared in the embodiments and comparative examples of the present invention were subjected to the following tests; the results are shown in Table 1.

[0074] The yarn resistance is tested using a multimeter, the yarn thickness is checked using a handheld digital thickness gauge, the breaking strength and elongation at break of the yarn are tested using a tensile testing machine, the weight of the yarn is tested using an electronic balance, and the length of the yarn is measured using a vernier caliper.

[0075] The formula for calculating electrical conductivity is:

[0076] σ = L / RS;

[0077] Where σ is the conductivity, R represents the resistance (Ω), and S is the cross-sectional area (m²). 2 L represents the length, in meters.

[0078] The formula for calculating linear density is:

[0079] Tt = 1000G K / L;

[0080] Where Tt is the linear density, G k L is the yarn weight in grams; L is the yarn length in meters.

[0081] Table 1

[0082] Conductivity (S / m) Breaking strength (MPa) Breaking elongation Example 1 12.36 7.0 188％ Example 2 8.72 7.3 192％ Example 3 6.38 8.1 206％ Example 4 4.04 10.5 212％ Example 5 15.2 5.4 125％ Example 6 12.26 7.6 214％ Example 7 12.36 9.7 213％ Comparative Example 1 0.01 11.8 223％ Comparative Example 2 3.76 4.01 14.5％ Comparative Example 3 5.54 3.29 8.9％

[0083] As can be seen from the data in Table 1, this invention uses interfacial polymerization technology to embed conductive nanomaterials within a membrane material, thus preparing conductive yarns with good uniformity and high conductivity. Furthermore, through analysis of the proportions and examples, it can be observed that the synergistic technology of interfacial polymerization and twisting not only effectively maintains the original elasticity of the yarn but also ensures that the yarn possesses high strength and conductivity. This indicates that the conductive yarn prepared by this invention has broad application prospects in the fields of electromagnetic shielding materials, antistatic materials, and high-performance textiles.

[0084] The present invention has been described in detail above with reference to the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method of making a flexible conductive yarn, characterized by, The method comprises the following steps: S1, mixing hexamethylene diamine solution, conductive carbon material solution and alkali solution to obtain an aqueous phase solution; mixing the aqueous phase solution and an oil phase monomer solution to perform interfacial polymerization to obtain a film; S2, stretching the film, removing organic solvent, twisting and drying to obtain a conductive yarn; The oil phase monomer solution comprises adipoyl chloride; The mass concentration of the conductive carbon material solution is 3-10%; the conductive carbon material in the conductive carbon material solution is selected from at least one of graphene, carbon nanotube, conductive carbon black or conductive carbon fiber; The mass concentration of the hexamethylene diamine solution in the aqueous phase solution is 3-5%; the mass concentration of adipoyl chloride in the oil phase monomer solution is 1.5-5%.

2. The method of claim 1, wherein the flexible conductive yarn is prepared by the steps of: The temperature of the interfacial polymerization of the aqueous phase solution and the oil phase monomer solution is 10-30℃.

3. The method of claim 1, wherein the flexible conductive yarn is prepared by the steps of: The twisting factor is 100-250.

4. The method of claim 1, wherein the flexible conductive yarn is prepared by the steps of: In step S2, the method for removing the organic solvent is mixing and heating the stretched film with deionized water and soaking to remove the organic solvent.

5. A flexible conductive yarn, characterized by, Prepared by the preparation method in any one of claims 1-4.

6. Application of the flexible conductive yarn in claim 5 in electromagnetic shielding material, antistatic material, smart textile or wearable device.

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