A functionalized terpolymer dispersion and its use in textiles

Abstract

The application discloses a functionalized terpolymer dispersion and application thereof in textiles, and belongs to the field of functional materials. The functionalized terpolymer dispersion is prepared by adding functional fillers into a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution; and then the functionalized terpolymer dispersion is used for functional finishing of textiles, so that the functional textiles are prepared. The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer is used for realizing good dispersion of functional materials, and the steps of adding a dispersant and modification are omitted; the functionalized terpolymer is used for functional finishing of textiles without the need of an adhesive, and the process is simpler.

Description

TECHNICAL FIELD

[0001] The present application relates to a functionalized terpolymer dispersion and its application in textiles, belonging to the field of functional materials. BACKGROUND

[0002] With the development of society and the improvement of people's living standards, people's demand for functionalization of textiles is increasing, and the requirements are also increasing. However, fibers, yarns and textiles generally do not have functionality, and to achieve their functionality, functional materials need to be introduced into fibers, yarns and textiles, and post-processing is the most direct and effective way.

[0003] However, functional materials are generally inorganic or metallic micro / nano fillers that are insoluble and infusible. Due to their small diameter and large specific surface area, they are prone to agglomeration and difficult to form a uniform dispersion in solvents. Generally, small molecule substances such as coupling agents are used to perform surface chemical treatment on them to achieve uniform dispersion of micro / nano functional fillers in solvents. Moreover, adhesives need to be added when functional materials are combined with substrates to achieve the combination of functional fillers with fibers, yarns or textiles, further increasing the complexity of functionalization of fibers, yarns and textiles.

[0004] Therefore, it is crucial to find a simple and effective method to functionalize fibers, yarns and textiles. SUMMARY

[0005] [TECHNICAL PROBLEM]

[0006] The dispersion of functional fillers generally requires the addition of dispersants or modification to achieve dispersion.

[0007] Conventional functional materials and substrates require adhesives for combination.

[0008] [TECHNICAL SCHEME]

[0009] To solve the above problems, the present application adds functional fillers to a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution to prepare a functionalized terpolymer dispersion. Then it is used for functional finishing of textiles to achieve the preparation of functional textiles. The present application realizes good dispersion of functional materials through tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer, omitting the steps of adding dispersants and modification. It does not require adhesives for functional finishing of textiles, and the process is simpler.

[0010] The first object of the present application is to provide a method for preparing a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion, comprising the following steps:

[0011] (1) stirring and mixing tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and solvent uniformly to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution;

[0012] (2) adding functional fillers to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution, stirring, and then ultrasonic oscillation to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion.

[0013] In an embodiment of the present application, the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer in step (1) has a fluorine content of less than 70%, and the weight percentages of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride structural units are 45.8%, 18.5% and 35.7%, respectively.

[0014] In an embodiment of the present application, the stirring in step (1) is magnetic stirring, specifically magnetic stirring at 20-70℃ for 10-120min.

[0015] In an embodiment of the present application, the solvent in step (1) is one of ethyl acetate, acetone, butanone, tetrahydrofuran, dichloromethane, trichloromethane, 1,4-dioxane, N,N-dimethylformamide and N,N-dimethylacetamide.

[0016] In an embodiment of the present application, the concentration of the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution in step (1) is 5-200mg / mL.

[0017] In an embodiment of the present application, the functional filler in step (2) is a commercially available insoluble and infusible micro / nanoparticle, specifically including one or more of carbon black, single-walled carbon nanotube, multi-walled carbon nanotube, graphene, vapor-phase nanocarbon fiber, copper sulfide, cuprous sulfide, cuprous iodide, photochromic microcapsule, phase change microcapsule, silver powder, silver nanowire, zinc oxide, titanium dioxide, vanadium powder, hafnium powder, magnesium powder, manganese powder, zirconium powder, indium powder, chromium powder, lead powder, bismuth powder, tin powder, niobium powder, tantalum powder, titanium powder, molybdenum powder, tungsten powder, nickel powder, aluminum powder, copper powder, zinc powder, iron powder, cobalt powder, nickel powder, tungsten powder, molybdenum powder, titanium powder, tantalum powder, vanadium dioxide, indium tin oxide, antimony tin oxide, tungsten oxide, bismuth oxide, molybdenum oxide, cobalt oxide, tin oxide, magnesium oxide, magnetite, iron oxide, nickel oxide, zirconium oxide, aluminum oxide, copper oxide, silicon dioxide, titanium carbonitride, aluminum carbonitride, hafnium carbide, molybdenum carbide, niobium carbide, tantalum carbide, vanadium carbide, chromium carbide, tungsten carbide, boron carbide, zirconium carbide, titanium carbide, silicon carbide, magnesium nitride, chromium nitride, zirconium nitride, silicon nitride, boron nitride, titanium nitride, aluminum nitride, molybdenum disulfide, tungsten disulfide, silicon boride, hafnium diboride, calcium hexaboride, titanium diboride, lanthanum hexaboride, zirconium diboride, boron powder, hafnium disilicide, zirconium disilicide, molybdenum disilicide, hafnium hydride, titanium hydride, zirconium hydride, dysprosium oxide, praseodymium oxide, neodymium oxide, gadolinium oxide, lanthanum oxide, samarium oxide, cerium oxide, yttrium oxide, MXene, cellulose nanocrystal, chitin nanocrystal, semiconductor quantum dot, perovskite quantum dot, fullerene, carbon dot.

[0018] In an embodiment of the present application, the stirring in step (2) is magnetic stirring, specifically magnetic stirring at 20-30°C for 10-30 min; the ultrasonic oscillation time is 20-180 min.

[0019] In an embodiment of the present application, the particle size of the functional filler in step (2) is 5 nm-5 μm.

[0020] In an embodiment of the present application, the concentration of the functional filler in step (2) in the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution is 0.05-30 mg / mL.

[0021] A second object of the present application is the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion prepared by the method of the present application.

[0022] A third object of the present application is to provide a method for preparing a functionalized textile based on the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion of the present application, comprising the following steps:

[0023] The textile is placed in the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, ultrasonic treatment is carried out at 20-30℃ for 0.5-8min, and then the textile is taken out and dried to obtain the functionalized textile.

[0024] In an embodiment of the present application, the textile includes fibers, yarns, fabrics, and specifically includes polyester, polypropylene, polyvinyl alcohol, acrylic, nylon 6, nylon 66, nylon 11, nylon 56, nylon 12, chlorofiber, polylactic acid fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polybutylene succinate fiber, ultra-high molecular weight polyethylene fiber, aramid 1313, aramid 1414, polyimide fiber, and blended yarns and fabrics thereof; and the fabric includes knitted fabric, woven fabric and non-woven material.

[0025] In an embodiment of the present application, the textile is placed in the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, which can submerge the textile.

[0026] A fourth object of the present application is the functionalized textile prepared by the method of the present application.

[0027] A fifth object of the present application is the use of the functionalized textile of the present application in the preparation of industrialized textile.

[0028] [Advantages]

[0029] (1) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer used in the present application is a fluorine-containing polymer, which can be dissolved in an organic solvent when the fluorine content is less than 70%, and can uniformly disperse the insoluble and infusible micro / nano particles in the solvent.

[0030] (2) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer used in the present application has a low content of tetrafluoroethylene structural units, which has good adhesion to fibers and their products, so that the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer can be used as an adhesive to firmly combine with the textile to increase the durability of the textile.

[0031] (3) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer used in the present application is a fluorine-containing polymer, which has hydrophobicity and flame retardancy, and can increase the hydrophobicity of the textile and reduce its flammability in addition to being used as a dispersant and an adhesive, and has good effect in realizing the hydrophobicity of the textile.

[0032] (4) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer used in the present application has good elasticity, and the textile treated by the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution will not reduce the elasticity. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described below. It should be understood that the embodiments are for better explanation of the present invention and are not intended to limit the present invention.

[0034] Test method:

[0035] 1. Conductivity testing method:

[0036] Use a multimeter to test the resistance of a 10cm length of fiber or yarn, and calculate the conductivity using the formula for conductivity.

[0037] 2. Photothermal performance testing method:

[0038] A solar simulator was used (simulating a solar radiation intensity of 1000 W / m²). 2 The sample was irradiated with a high-efficiency photothermal responsive polylactic acid material, and the temperature change of the sample was recorded by an infrared thermal imager for 1 minute.

[0039] 3. Photochromic performance test method:

[0040] The color difference of the material was tested using a Datacolor CI7800 computer colorimeter at D65 / 10°.

[0041] 4. Antibacterial performance test method:

[0042] The antibacterial properties of the material were tested according to the standard GB / T 20944.3-2008 Evaluation of antimicrobial properties of textiles - Part 3: Vibration method.

[0043] 5. Sensor performance test:

[0044] The applied pressure was adjusted using a push-pull force gauge (Yueqing Aidebao Instrument Co., Ltd.), and real-time current data was acquired using an electrochemical workstation CME-660E (Shanghai Chenhua Instrument Co., Ltd.). The test voltage was 5V.

[0045] The formula for calculating sensitivity is as follows:

[0046] Sensitivity S = (ΔI / I0) / ΔP;

[0047] Where ΔI is the change in current, I0 is the initial current, and ΔP is the applied pressure.

[0048] 6. Hydrophobicity test:

[0049] DSA25 droplet shape analyzer was used. (Germany) 10 μL of water was dropped onto the surface to test the water contact angle.

[0050] 7. Wash fastness test:

[0051] The sample was placed in a beaker containing deionized water, stirred with a magnetic stirrer at a speed of 500 rmp for 5 min, rinsed with deionized water after being taken out, and then dried, and its corresponding functionality was tested.

[0052] Raw materials used in the examples:

[0053] Tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer: the weight percentages of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride structural units were 45.8%, 18.5% and 35.7%, respectively;

[0054] Multi-walled carbon nanotubes: diameter 20-40 nm, length 5-15 μm;

[0055] Red photochromic microcapsules: model PMR01, average particle size 3±1 μm, purchased from Guangzhou Shengse Technology Co., Ltd.;

[0056] Zirconium carbide: average particle size 30 nm, purity 99.9%, specific surface area 75 m 2 / g, density 15.5 g / cm 3 , purchased from Shanghai Pantian Powder Materials Co., Ltd.;

[0057] Nano-silver: average particle size 50 nm, purity 99.9%, specific surface area 30 m 2 / g, density 10.5 g / cm 3 , purchased from Shanghai Pantian Powder Materials Co., Ltd.;

[0058] Polyamide 11 filament: polyamide 11 raw material from Arkema, France, model PA11 BMO TLD, corresponding filament self-made, diameter 136.6 μm;

[0059] Polylactic acid filament: 150D / 144f FDY;

[0060] Polyester filament: 150D / 144f FDY;

[0061] Polyester-cotton blended yarn: 32S, T60 / C30;

[0062] Nylon 6-based air-laid nonwoven material: thickness 1.2 cm, area density 320 g / m 2 ;

[0063] Polyester-based air-laid nonwoven material: thickness 1.0 cm, area density 250 g / m 2 .

[0064] Example 1

[0065] A method for preparing a functionalized nylon 6-based air-laid nonwoven material based on a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, comprising the following steps:

[0066] (1) mixing tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and ethyl acetate, magnetically stirring at 60°C for 60 min to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution with a concentration of 20 mg / mL;

[0067] (2) adding multi-walled carbon nanotubes to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution so that the concentration is 8 mg / mL, magnetically stirring at room temperature for 30 min, and then ultrasonic oscillation for 120 min to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid;

[0068] (3) immersing a nylon 6-based air-laid nonwoven material in the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid at room temperature for 5 min under ultrasonic oscillation, and then drying through a drying device to obtain a piezoresistive sensor.

[0069] The obtained piezoresistive sensor is subjected to performance testing, and the testing structure is as follows:

[0070] The sensitivity of the piezoresistive sensor is 1.26 kPa -1 , and the water contact angle is 153°.

[0071] Example 2

[0072] A method for preparing a functionalized nylon 6-based air-laid nonwoven material based on a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, comprising the following steps:

[0073] (1) mixing tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and ethyl acetate, magnetically stirring at 60°C for 60 min to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution with a concentration of 20 mg / mL;

[0074] (2) adding multi-walled carbon nanotubes to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution so that the concentration is 4 mg / mL, magnetically stirring at room temperature for 30 min, and then ultrasonic oscillation for 120 min to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid;

[0075] (3) immersing a nylon 6-based air-laid nonwoven material in the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid at room temperature for 5 min under ultrasonic oscillation, and then drying through a drying device to obtain a piezoresistive sensor.

[0076] The obtained piezoresistive sensor is subjected to performance test, and the test structure is as follows:

[0077] The sensitivity of the piezoresistive sensor is 0.83 kPa -1 , and the water contact angle is 152°.

[0078] Example 3

[0079] A method for preparing a polyester-based air-laid nonwoven material based on a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, comprising the following steps:

[0080] (1) mixing tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and ethyl acetate, and stirring magnetically at 60°C for 60 min to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution with a concentration of 20 mg / mL;

[0081] (2) adding 0.5 μm zirconium carbide to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution so that the concentration is 8 mg / mL, stirring magnetically at room temperature for 30 min, and then ultrasonic oscillation for 120 min to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid;

[0082] (3) immersing 0.5 μm zirconium carbide in the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid at room temperature for 5 min, and then drying through a drying device to obtain a photo-heat nonwoven material.

[0083] The obtained photo-heat nonwoven material is subjected to performance test, and the test structure is as follows:

[0084] The temperature of the photo-heat nonwoven material can reach 70°C, and the water contact angle is 154°.

[0085] Example 4

[0086] A method for preparing functionalized polyamide 11 filaments based on a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, comprising the following steps:

[0087] (1) mixing tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and ethyl acetate, and stirring magnetically at 60°C for 60 min to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution with a concentration of 80 mg / mL;

[0088] (2) adding multi-walled carbon nanotubes to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution so that the concentration is 10 mg / mL, stirring magnetically at room temperature for 20 min, and then ultrasonic oscillation for 60 min to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid;

[0089] (3) The polyamide 11 filaments are unwound from the bobbin, then immersed in the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid at room temperature for ultrasonic treatment for 5 min, then dried through a drying device, and finally the treated polyamide 11 filaments are wound onto the bobbin at a speed of 1 m / min to obtain the polyamide 11 conductive filaments.

[0090] The obtained polyamide 11 conductive filaments are subjected to performance testing, and the testing structure is as follows:

[0091] The conductivity of the polyamide 11 conductive filaments is 1.3 S / m.

[0092] Example 5

[0093] A method for preparing functionalized polylactic acid filaments based on a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, comprising the following steps:

[0094] (1) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and ethyl acetate are mixed and magnetically stirred at 60°C for 60 min to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution with a concentration of 60 mg / mL;

[0095] (2) Red photochromic microcapsules are added to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution to make the concentration thereof 0.5 mg / mL, and then the mixture is magnetically stirred at room temperature for 20 min and ultrasonically oscillated for 60 min to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid;

[0096] (3) The polylactic acid filaments are unwound from the bobbin, then immersed in the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid at room temperature for ultrasonic treatment for 5 min, then dried through a drying device, and finally the treated polylactic acid filaments are wound onto the bobbin at a speed of 2 m / min to obtain the photochromic polylactic acid filaments.

[0097] The obtained photochromic polylactic acid filaments are subjected to performance testing, and the testing structure is as follows:

[0098] The color difference of the photochromic polylactic acid filaments can reach 13.6.

[0099] Example 6

[0100] A method for preparing functionalized polyester filaments based on a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion liquid, comprising the following steps:

[0101] (1) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and ethyl acetate were mixed and magnetically stirred at 60°C for 60 min to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution with a concentration of 40 mg / mL.

[0102] (2) Add 100 nm of nano silver powder to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution to make its concentration 1 mg / mL, stir magnetically for 20 min at room temperature, and then sonicate for 60 min to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion.

[0103] (3) The polyester filament is unwound from the bobbin, then immersed at room temperature in a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion and ultrasonicated for 5 minutes. After drying in a drying device, the treated polyester filament is wound onto the bobbin at a speed of 1 m / min to obtain antibacterial polyester filament.

[0104] The obtained antibacterial polyester filament was subjected to performance testing, and the test structure is as follows:

[0105] The antibacterial polyester filaments exhibited inhibition rates of 99.3% and 97.8% against Staphylococcus aureus and Escherichia coli, respectively.

[0106] Example 7

[0107] A method for preparing functionalized polyester-cotton blended yarn based on a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion includes the following steps:

[0108] (1) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and ethyl acetate were mixed and magnetically stirred at 60°C for 60 min to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution with a concentration of 80 mg / mL.

[0109] (2) Add multi-walled carbon nanotubes to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution to make its concentration 10 mg / mL, stir magnetically for 20 min at room temperature, and then sonicate for 60 min to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion.

[0110] (3) The 32S polyester-cotton blended yarn (T60 / C30) is unwound from the bobbin, then immersed at room temperature in a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion and ultrasonicated for 5 minutes, then dried by a drying device, and finally wound onto the bobbin at a speed of 1 m / min to obtain conductive polyester-cotton blended yarn.

[0111] The obtained conductive polyester-cotton blended yarn was subjected to performance testing. The test structure is as follows:

[0112] The conductivity of the conductive polyester-cotton blended yarn is 0.9 S / m.

[0113] Comparative Example 1

[0114] The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer in step (1) of Example 1 was replaced with polyacrylic acid, while the rest remained the same as in Example 1, to obtain a piezoresistive sensor.

[0115] Comparative Example 2

[0116] Omit the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer in step (1) of Example 1, mix multi-walled carbon nanotubes and ethyl acetate to obtain a dispersion; then immerse nylon 6-based air-blown nonwoven material in the dispersion at room temperature, and keep the rest consistent with Example 1 to obtain a piezoresistive sensor.

[0117] Example 8

[0118] The concentration of the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution in step (1) of Example 1 was adjusted to 5 mg / mL, while other steps remained the same as in Example 1, to obtain a piezoresistive sensor.

[0119] Example 9

[0120] The concentration of the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution in step (1) of Example 1 was adjusted to 50 mg / mL, while other steps remained the same as in Example 1, to obtain a piezoresistive sensor.

[0121] The obtained piezoresistive sensor was subjected to performance testing, and the test results are shown in Table 1 below:

[0122] Table 1 Functionality of materials before and after washing

[0123]

[0124] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A method for preparing a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion, characterized in that, Includes the following steps: (1) The tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer and the solvent are stirred and mixed evenly to obtain a tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution. (2) Add functional filler to the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution, stir, and then ultrasonically vibrate to obtain the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion. The fluorine content in the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer described in step (1) is less than 70%; the concentration of the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution is 5-80 mg / mL; and the weight percentages of the tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride structural units are 45.8%, 18.5%, and 35.7%, respectively. The functional filler in step (2) is a multi-walled carbon nanotube with a diameter of 20-40 nm and a length of 5-15 μm; the concentration of the functional filler in the tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer solution is 8 mg / mL.

2. The method according to claim 1, characterized in that, The solvent mentioned in step (1) is one of ethyl acetate, acetone, butanone, tetrahydrofuran, dichloromethane, chloroform, 1,4-dioxane, N,N-dimethylformamide and N,N-dimethylacetamide.

3. The functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion prepared by the method according to any one of claims 1-2.

4. A functionalized textile prepared based on the functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion as described in claim 3, characterized in that, Its preparation method includes the following steps: Nylon 6-based air-laid nonwoven material was placed in a functionalized tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer dispersion and ultrasonically treated at 20-30℃ for 0.5-8 min. After removal and drying, functionalized textiles were obtained. The thickness of the nylon 6-based air-laid nonwoven material was 1.2 cm, and the areal density was 320 g / m³. 2 ; Functional textiles are used as piezoresistive sensors.

5. The application of the functionalized textile of claim 4 in the preparation of industrialized textiles.

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