Preparation method of terahertz wave absorption type flexible electromagnetic interference shielding fabric

Abstract

The invention belongs to the field of functional fabrics, and provides a preparation method of a terahertz wave absorption type flexible electromagnetic interference shielding fabric, which comprises the following steps: firstly, designing and configuring a composite slurry containing an active wave-absorbing substance with a set viscosity, carrying out curing molding and drying to obtain yarns coated with the active wave-absorbing substances; then, the yarns coated with the active wave-absorbing substances are used for weaving, and the terahertz wave absorption type flexible electromagnetic interference shielding fabric is obtained. Compared with most existing wave-absorbing fabrics, the active wave-absorbing fabric has the advantages that the slurry containing the active wave-absorbing substances is fully fused with the yarns, the yarns filled with the active wave-absorbing substances can be seen microcosmically, and the distribution of the active wave-absorbing substances on the surfaces of the yarns can be seen macroscopically, so that the active wave-absorbing substances are not easy to fall off; the fabric structure and the wave-absorbing effect are more stable, so that the application requirements of light weight, thinness, width and strength of the fabric in the wave-absorbing field are met to the greatest extent.

Description

Technical Field

[0001] The present invention belongs to the field of functional fabrics, relates to a method for preparing absorbing fabrics, and specifically provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric. Background Art

[0002] With the advent of the 5G communications era, various electronic and electrical devices have become widely used in people's lives, but the accompanying electromagnetic radiation problem is also becoming increasingly serious. Research has found that electromagnetic waves in space can cause damage to the human central nervous system, endocrine system, cardiovascular system, immune system, and reproductive system, as well as damage the eyes and even cause cancer, becoming an invisible killer to human health. To address this problem, electromagnetic shielding materials have been proposed and studied in depth. Most electromagnetic shielding materials are mainly reflective, which can easily cause secondary reflection pollution of electromagnetic waves and interfere with the normal operation of other electronic devices. In contrast, absorptive electromagnetic shielding materials, which mainly absorb incident electromagnetic waves, can convert incident electromagnetic waves into heat or other forms of energy within the material, thereby eliminating the harm caused by secondary reflection to the human body and the environment.

[0003] At present, absorbing fabrics mainly include coated absorbing fabrics, surface-plated absorbing fabrics, impregnated absorbing fabrics, and structural absorbing fabrics. Although there are various types of absorbing fabrics, in terms of preparation methods, they all load active absorbing materials on the surface of existing fabrics. This preparation method causes the active absorbing materials loaded on the surface of the fabric to easily fall off the fabric surface when subjected to external factors (such as friction, tearing, etc.), thereby affecting the fabric's absorbing performance. Therefore, if the active absorbing material can be fully integrated with the textile yarn, the stability problem of the fabric can be effectively solved, and the structure and functionality of the fabric can also be significantly improved. In addition, the structural design of the fabric also shows a significant impact on the absorbing effect, specifically on the bandwidth of electromagnetic wave absorption, absorption efficiency, and the practicality of the fabric itself, such as lightness and thinness. However, there are relatively few research reports in this area, and it is also a great challenge for fabrics to simultaneously meet the characteristics of lightness, thinness, width, and strength in electromagnetic wave absorption applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric (abbreviated as absorbing fabric) to solve the stability problem of the absorbing fabric and improve the performance of the absorbing fabric. The present invention first fully fuses the active absorbing slurry with the yarn used for loading by spinning, then solidifies and dries the yarn to obtain the yarn for textile use. The yarn is then woven according to the designed fabric structure, finally obtaining a terahertz wave absorbing flexible electromagnetic interference shielding fabric with a stable structure and high absorption performance.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, characterized by comprising the following steps:

[0007] Step 1: Place an organic dispersion of the active absorbing material in a flask, add a polymer under mechanical stirring, and continue stirring until the solid polymer is completely dissolved to obtain a composite slurry of the active absorbing material and the polymer;

[0008] Step 2: ultrasonically washing the yarn with deionized water and ethanol in sequence, and then drying the yarn in a vacuum drying oven for later use;

[0009] Step 3: Placing the yarn in a plasma cleaning apparatus for plasma treatment to complete surface modification;

[0010] Step 4: Place the composite slurry in the injection device, pass the yarn through the syringe of the injection device and lead it out by the needle. The drawn yarn passes through the curing box and is collected by the reel to complete the coating of the composite slurry on the yarn;

[0011] Step 5: Transfer the yarn to a vacuum drying oven for drying and then use, thereby obtaining yarn coated with an active absorbing material;

[0012] Step 6: Weaving the yarn coated with the active absorbing material to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0013] Furthermore, in step 1, the active absorbing material includes: a two-dimensional MXene absorbing material (including Ti3C2T x 、Ti2CT x 、Mo2TiC2T x 、Mo2Ti2C3T x 、Mo2CT x 、Nb4C3T x 、Nb2CT x 、V2CT x ), graphene and its derivatives (graphene oxide, reduced graphene oxide), the solvent of the organic dispersion of the active absorbing material is any one of dimethyl sulfoxide, N,N-dimethylformamide, and N,N-dimethylacetamide, and the polymer is polyurethane particles.

[0014] Furthermore, in step 1, in the composite slurry, Ti3C2T x The mass fraction of MXene ranges from 1% to 4%, the mass fraction of other MXenes, graphene and their derivatives ranges from 30% to 70%, and the concentration of polyurethane is 100 mg / mL to 200 mg / mL.

[0015] Furthermore, in step 1, the rotation speed of the mechanical stirring is 100 rpm to 300 rpm (revolutions per minute).

[0016] Furthermore, in step 2, the ultrasonic power of ultrasonic washing is 100W to 200W, the single washing time is 10 to 20 minutes, the drying temperature is 40°C to 80°C, and the time is more than 6 hours.

[0017] Furthermore, in step 3, during the plasma treatment, the atmosphere is oxygen, the vacuum degree is 50 Pa, the plasma radiation intensity is 10.5 W to 18 W, and the radiation time is 10 minutes to 20 minutes.

[0018] Furthermore, in step 4, the needle gauge of the injection device is 19G, 20G or 21G.

[0019] Furthermore, in step 4, the rotation speed of the reel is 1 rpm to 15 rpm (revolutions per minute).

[0020] Furthermore, in step 4, the liquid medium in the curing box is water or ethanol, the length of the curing box is more than 1.2 meters, and the curing temperature is room temperature.

[0021] Furthermore, in step 5, the drying temperature is 40° C. to 80° C. and the drying time is more than 12 hours.

[0022] Based on the above technical solution, the beneficial effects of the present invention are:

[0023] The present invention provides a preparation method of a terahertz wave absorbing flexible electromagnetic interference shielding fabric. First, a composite slurry containing an active absorbing substance with a set viscosity is designed and configured. The composite slurry can penetrate into the interior of the yarn and maximize fusion with the yarn. The composite slurry can be simply cured, formed, and dried to obtain a yarn coated with the active absorbing substance. The yarn coated with the active absorbing substance is then woven to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric. Compared with most existing absorbing fabrics, the present invention fully fuses the slurry containing the active absorbing substance with the yarn. The active absorbing substance can be seen microscopically filling the interior of the yarn and macroscopically distributed on the surface of the yarn, making the active absorbing substance less likely to fall off, and the fabric structure and absorbing effect are more stable, thereby maximally meeting the application requirements of the fabric in the field of absorbing lightness, thinness, width, and strength. In addition, the preparation method provided by the present invention has a simple process, is easy to operate, has a low production cost, and is conducive to industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a scanning electron microscope image of the ultra-high molecular weight polyethylene yarn in an embodiment of the present invention.

[0025] Figure 2This is a scanning electron microscope image of the cross section of the ultra-high molecular weight polyethylene yarn in an embodiment of the present invention.

[0026] Figure 3 In the embodiment of the present invention, Ti3C2T x Figure 2 shows the tensile strength test results of ultra-high molecular weight polyethylene yarn.

[0027] Figure 4 This is a graph showing the reflection loss and absorptivity test results of the terahertz wave absorbing flexible electromagnetic interference shielding fabric in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments; it is obvious that the described embodiments are only some preferred embodiments of the present invention, rather than all embodiments.

[0029] Example 1

[0030] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0031] Step 1: Add Ti3C2T into a three-necked flask x The organic dispersion of (MXene) (solvent: dimethyl sulfoxide) was prepared, and then the corresponding mass of polyurethane (PU) particles was weighed. The weighed polyurethane particles were added to the Ti3C2T x The organic dispersion was stirred for 6 hours until the PU particles were completely dissolved and fully mixed with MXene to prepare a Ti3C2T x Composite slurry with polyurethane, the final composite slurry contains Ti3C2T x The mass fraction of is 2%, and the concentration of polyurethane is 200 mg / mL;

[0032] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0033] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0034] Step 4: Add Ti3C2T xThe composite slurry with polyurethane is placed in an injection device (a syringe with a needle), the yarn is passed through the syringe of the injection device and drawn out by the needle, the drawn yarn passes through a curing box and is collected by a reel. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm, the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; the reel is started, and the yarn is pulled by the reel through the injection device containing the composite slurry, and then cured to complete the coating of the composite slurry on the yarn;

[0035] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0036] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0037] The beneficial effects of the present invention are described in detail below in conjunction with actual tests.

[0038] In this embodiment, the yarn is made of ultra-high molecular weight polyethylene fiber with specifications of 200D, 400D, and 600D. The three specifications are prepared using the same process to obtain terahertz wave absorbing flexible electromagnetic interference shielding fabrics with similar performance. Taking 400D as an example, the scanning electron microscope image (SEM image) of the ultra-high molecular weight polyethylene yarn is as follows: Figure 1 As shown, in this embodiment, Ti3C2T x The scanning electron microscope image (SEM image) of ultra-high molecular weight polyethylene yarn is as follows Figure 2 As shown by Figure 1 and Figure 2 It can be seen that after the spinning process, the surface of the yarn and the single fiber are wrapped by the composite slurry, indicating that the composite slurry is well combined with the yarn.

[0039] Furthermore, ultra-high molecular weight polyethylene fiber (Fiber), ultra-high molecular weight polyethylene yarn (400D Yarn) and the Ti3C2T x The tensile strength of ultra-high molecular weight polyethylene yarn (Yarn-MXene) was compared and the results were as follows: Figure 3 As shown in the figure, it can be seen that from a single fiber to yarn and then to yarn coated with a composite sizing agent, the tensile strength decreases, but it still has the advantage of high strength; in addition, its elongation at break increases gradually, and the yarn coated with a composite sizing agent has the largest elongation at break. The surface coating with a composite sizing agent brings beneficial effects, making the fabric more resistant to pulling.

[0040] Furthermore, the reflection loss and absorptivity of the terahertz wave absorbing flexible electromagnetic interference shielding fabric prepared in this embodiment were tested, and the results were as follows: Figure 4 As shown in the figure, it can be seen that the reflection loss of the fabric is above 25dB and the absorption rate is above 99.5%. The reflection loss and the absorption rate results match, which shows that the fabric prepared by the present invention has excellent absorption performance and good test stability.

[0041] Example 2

[0042] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0043] Step 1: Add an organic dispersion of graphene oxide (solvent: dimethyl sulfoxide) to a three-necked flask, then weigh the corresponding mass of polyurethane (PU) particles. Add the weighed polyurethane particles to the organic dispersion of graphene oxide while mechanically stirring at a speed of 200 rpm, and continue stirring for 6 hours until the PU particles are completely dissolved and fully mixed with the graphene oxide to prepare a composite slurry containing graphene oxide and polyurethane. The mass fraction of graphene oxide in the final composite slurry is 60%, and the concentration of polyurethane is 200 mg / mL;

[0044] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0045] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0046] Step 4: Place the composite slurry containing graphene oxide and polyurethane in an injection device (a syringe with a needle), pass the yarn through the syringe of the injection device and lead it out by the needle, and collect the yarn by the reel after passing through the curing box. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm (revolutions / minute), the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; start the reel, and the yarn passes through the injection device containing the composite slurry under the traction of the reel, and then undergoes curing to complete the coating of the composite slurry on the yarn;

[0047] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0048] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0049] Example 3

[0050] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0051] Step 1: Add an organic dispersion of graphene (solvent: dimethyl sulfoxide) to a three-necked flask, then weigh the corresponding mass of polyurethane (PU) particles. During mechanical stirring at a speed of 200 rpm, the weighed polyurethane particles are added to the organic dispersion of graphene and stirred for 6 hours until the PU particles are completely dissolved and fully mixed with the graphene to prepare a composite slurry containing graphene and polyurethane. The mass fraction of graphene oxide in the final composite slurry is 40%, and the concentration of polyurethane is 200 mg / mL;

[0052] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0053] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0054] Step 4: Place the composite slurry containing graphene and polyurethane in an injection device (a syringe with a needle), pass the yarn through the syringe of the injection device and lead it out by the needle, and collect the yarn by the reel after passing through the curing box. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm (revolutions / minute), the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; start the reel, and the yarn passes through the injection device containing the composite slurry under the traction of the reel, and then undergoes curing to complete the coating of the composite slurry on the yarn;

[0055] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0056] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0057] Example 4

[0058] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0059] Step 1: Add an organic dispersion of reduced graphene oxide (solvent: dimethyl sulfoxide) to a three-necked flask, then weigh the corresponding mass of polyurethane (PU) particles, add the weighed polyurethane particles to the organic dispersion of reduced graphene oxide while mechanically stirring at a speed of 200 rpm, and continue stirring for 6 hours until the PU particles are completely dissolved and fully mixed with the reduced graphene oxide to prepare a composite slurry containing reduced graphene oxide and polyurethane. The mass fraction of reduced graphene oxide in the final composite slurry is 50%, and the concentration of polyurethane is 200 mg / mL;

[0060] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0061] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0062] Step 4: Place the composite slurry containing reduced graphene oxide and polyurethane in an injection device (a syringe containing a needle), pass the yarn through the syringe of the injection device and lead it out by the needle, and collect the yarn by the reel after passing through the curing box. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm (revolutions / minute), the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; start the reel, and the yarn passes through the injection device containing the composite slurry under the traction of the reel, and then undergoes curing to complete the coating of the composite slurry on the yarn;

[0063] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0064] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0065] Example 5

[0066] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0067] Step 1: Add Ti3C2T into a three-necked flaskx The organic dispersion of (MXene) (solvent: N,N-dimethylformamide) was prepared, and then the corresponding mass of polyurethane (PU) particles was weighed. The weighed polyurethane particles were added to the Ti3C2T x The organic dispersion was stirred for 6 hours until the PU particles were completely dissolved and fully mixed with MXene to prepare a Ti3C2T x Composite slurry with polyurethane, the final composite slurry contains Ti3C2T x The mass fraction of is 4%, and the concentration of polyurethane is 200 mg / mL;

[0068] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0069] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0070] Step 4: Add Ti3C2T x The composite slurry with polyurethane is placed in an injection device (a syringe with a needle), the yarn is passed through the syringe of the injection device and drawn out by the needle, the drawn yarn passes through a curing box and is collected by a reel. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm, the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; the reel is started, and the yarn is pulled by the reel through the injection device containing the composite slurry, and then cured to complete the coating of the composite slurry on the yarn;

[0071] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0072] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0073] Example 6

[0074] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0075] Step 1: Add Ti3C2T into a three-necked flask xThe organic dispersion of (MXene) (solvent: N,N-dimethylacetamide) was prepared, and then the corresponding mass of polyurethane (PU) particles was weighed. The weighed polyurethane particles were added to the Ti3C2T x The organic dispersion was stirred for 6 hours until the PU particles were completely dissolved and fully mixed with MXene to prepare a Ti3C2T x Composite slurry with polyurethane, the final composite slurry contains Ti3C2T x The mass fraction of is 1.5%, and the concentration of polyurethane is 200 mg / mL;

[0076] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0077] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0078] Step 4: Add Ti3C2T x The composite slurry with polyurethane is placed in an injection device (a syringe with a needle), the yarn is passed through the syringe of the injection device and drawn out by the needle, the drawn yarn passes through a curing box and is collected by a reel. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm, the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; the reel is started, and the yarn is pulled by the reel through the injection device containing the composite slurry, and then cured to complete the coating of the composite slurry on the yarn;

[0079] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0080] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0081] Example 7

[0082] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0083] Step 1: Add Mo2TiC2T into a three-necked flask xThe organic dispersion of (MXene) (solvent: dimethyl sulfoxide) was prepared, and then the corresponding mass of polyurethane (PU) particles were weighed. The weighed polyurethane particles were added to the Mo2TiC2T x The organic dispersion was stirred for 6 hours until the PU particles were completely dissolved and fully mixed with MXene to prepare a Ti3C2T x Composite slurry with polyurethane, the final composite slurry contains Mo2TiC2T x The mass fraction of is 30%, and the concentration of polyurethane is 200 mg / mL;

[0084] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0085] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0086] Step 4: Add Mo2TiC2T x The composite slurry with polyurethane is placed in an injection device (a syringe with a needle), the yarn is passed through the syringe of the injection device and drawn out by the needle, the drawn yarn passes through a curing box and is collected by a reel. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm, the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; the reel is started, and the yarn is pulled by the reel through the injection device containing the composite slurry, and then cured to complete the coating of the composite slurry on the yarn;

[0087] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0088] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0089] Example 8

[0090] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0091] Step 1: Add Mo2Ti2C3T into a three-necked flask xThe organic dispersion of (MXene) (solvent: dimethyl sulfoxide) was prepared, and then the corresponding mass of polyurethane (PU) particles were weighed. The weighed polyurethane particles were added to the Mo2Ti2C3T x The organic dispersion was stirred for 6 hours until the PU particles were completely dissolved and fully mixed with MXene to prepare a product containing Mo2Ti2C3T x Composite slurry with polyurethane, the final composite slurry contains Mo2Ti2C3T x The mass fraction of is 50%, and the concentration of polyurethane is 200 mg / mL;

[0092] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0093] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0094] Step 4: Add Mo2Ti2C3T x The composite slurry with polyurethane is placed in an injection device (a syringe with a needle), the yarn is passed through the syringe of the injection device and drawn out by the needle, the drawn yarn passes through a curing box and is collected by a reel. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm, the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; the reel is started, and the yarn is pulled by the reel through the injection device containing the composite slurry, and then cured to complete the coating of the composite slurry on the yarn;

[0095] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0096] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0097] Example 9

[0098] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0099] Step 1: Add Nb2CT into a three-necked flask xThe organic dispersion of (MXene) (solvent: dimethyl sulfoxide) was prepared, and then the corresponding mass of polyurethane (PU) particles was weighed. The weighed polyurethane particles were added to the Nb2CT x The organic dispersion was stirred for 6 hours until the PU particles were completely dissolved and fully mixed with MXene to prepare a product containing Mo2Ti2C3T x Composite slurry with polyurethane, the final composite slurry contains Nb2CT x The mass fraction of is 60%, and the concentration of polyurethane is 200 mg / mL;

[0100] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0101] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0102] Step 4: Add Nb2CT x The composite slurry with polyurethane is placed in an injection device (a syringe with a needle), the yarn is passed through the syringe of the injection device and drawn out by the needle, the drawn yarn passes through a curing box and is collected by a reel. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm, the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; the reel is started, and the yarn is pulled by the reel through the injection device containing the composite slurry, and then cured to complete the coating of the composite slurry on the yarn;

[0103] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0104] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0105] Example 10

[0106] This embodiment provides a method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, which specifically includes the following steps:

[0107] Step 1: Add Ti2CT into a three-necked flask xThe organic dispersion of (MXene) (solvent: dimethyl sulfoxide) was prepared, and then the corresponding mass of polyurethane (PU) particles was weighed. The weighed polyurethane particles were added to the Ti2CT x The organic dispersion was stirred for 6 hours until the PU particles were completely dissolved and fully mixed with MXene to prepare a Ti2CT x Composite slurry with polyurethane, Ti2CT in the final composite slurry x The mass fraction of is 10%, and the concentration of polyurethane is 200 mg / mL;

[0108] Step 2: ultrasonically clean the yarn with deionized water and ethanol in sequence, with an ultrasonic power of 150W and a single washing time of 10 minutes; then place the yarn in a blast drying oven for drying at a temperature of 60°C for 12 hours;

[0109] Step 3: Place the yarn in a plasma cleaning apparatus and perform plasma treatment in an oxygen atmosphere with a vacuum degree of 50 Pa, a plasma radiation intensity of 10.5 W, and a radiation time of 10 minutes to complete the surface modification;

[0110] Step 4: Add Ti2CT x The composite slurry with polyurethane is placed in an injection device (a syringe with a needle), the yarn is passed through the syringe of the injection device and drawn out by the needle, the drawn yarn passes through a curing box and is collected by a reel. The needle specification of the injection device is 19G, the speed of the reel is 15 rpm, the liquid medium in the curing box is water, the length of the curing box is 1.2 meters, and the curing temperature is room temperature; the reel is started, and the yarn is pulled by the reel through the injection device containing the composite slurry, and then cured to complete the coating of the composite slurry on the yarn;

[0111] Step 5: The yarn is removed from the winder and transferred to a vacuum drying oven, where it is dried at 60°C for 12 hours to remove the organic solvent and water, thereby obtaining yarn coated with an active absorbing material.

[0112] Step 6: The yarn coated with the active absorbing material is woven using an industrial textile machine to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

[0113] The above description is only a specific embodiment of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes; all disclosed features, or all steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A method for preparing a terahertz wave absorbing flexible electromagnetic interference shielding fabric, characterized in that: The following steps are involved: Step 1: Place an organic dispersion of the active absorbing material in a flask, add a polymer under mechanical stirring, and continue stirring until the solid polymer is completely dissolved to obtain a mixed slurry of the active absorbing material and the polymer; Step 2: ultrasonically washing the yarn with deionized water and ethanol in sequence, and then drying the yarn in a vacuum drying oven for later use; Step 3: Placing the yarn in a plasma cleaning apparatus for plasma treatment to complete surface modification; Step 4: Place the composite slurry in the injection device, pass the yarn through the syringe of the injection device and lead it out by the needle. The drawn yarn passes through the curing box and is collected by the reel to complete the coating of the composite slurry on the yarn; Step 5: Transfer the yarn to a vacuum drying oven for drying and then use, thereby obtaining yarn coated with an active absorbing material; Step 6: Weaving the yarn coated with the active absorbing material to obtain a terahertz wave absorbing flexible electromagnetic interference shielding fabric.

2. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 1, the active absorbing material includes: two-dimensional MXene absorbing material, graphene and its derivatives. The solvent of the organic dispersion of the active absorbing material is dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide, or a combination of any two in any proportion. The polymer is polyurethane particles.

3. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 1, in the organic dispersion of the active absorbing substance, the mass fraction of the active absorbing substance is 1% to 70%, and the concentration of the polymer is 100 mg / mL to 200 mg / mL.

4. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 1, the rotation speed of the mechanical stirring is 100 rpm to 300 rpm.

5. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 2, the ultrasonic power of ultrasonic washing is 100W to 200W, the single washing time is 10 minutes to 20 minutes, the drying temperature is 40°C to 80°C, and the time is more than 6 hours.

6. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 3, during the plasma treatment, the atmosphere is oxygen, the vacuum degree is 50 Pa, the plasma radiation intensity is 10.5 W to 18 W, and the radiation time is 10 minutes to 20 minutes.

7. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 4, the needle gauge of the injection device is 19G, 20G or 21G, and the rotation speed of the reel is 1 rpm to 15 rpm.

8. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 4, the liquid medium in the curing box is water or ethanol, the length of the curing box is more than 1.2 meters, and the curing temperature is room temperature.

9. The method for preparing the terahertz wave absorbing flexible electromagnetic interference shielding fabric according to claim 1, characterized in that: In step 5, the drying temperature is 40° C. to 80° C., and the drying time is more than 12 hours.

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