A kind of antifreeze conductive gel and its preparation and application

Abstract

The present invention relates to the technical field of flexible sensors, and in particular to an antifreeze conductive gel and its preparation and application. The present invention first mixes choline chloride and polyacrylamide to form a eutectic solution; then, alginate, a crosslinking agent and an initiator are sequentially added to the eutectic solution to initiate a polymerization reaction to obtain an antifreeze conductive gel. The antifreeze conductive gel of the present invention has high light transmittance, large elongation at break, fracture strength, and large fracture energy. At the same time, the antifreeze conductive gel has a strong self-healing ability. The prepared antifreeze conductive gel is conductive and can be used as an electronic skin to respond to a variety of human body movements. The antifreeze conductive gel is simple to prepare, low in cost, has good flexibility, high conductivity and excellent mechanical properties, and has great application potential in wearable electronic skin, prostheses, and sensors for the human body.

Description

Technical Field

[0001] The invention relates to the technical field of flexible sensors, and in particular to an antifreeze conductive gel and a preparation and application thereof. Background Art

[0002] Conductive elastomers exhibit both mechanical toughness and electrical conductivity, and have great technological application value, especially in stretchable electronics and flexible photonics. Functional elastomers with conductive properties provide great development opportunities for flexible electronics and soft machinery, and have promoted the rapid development of related research fields in recent years. Due to the biocompatibility, flexibility, and conductivity of conductive gels, they are widely used in the design and preparation of biosensors, medical monitoring, human-computer interaction, etc.

[0003] Human skin covers our entire body. It can not only convert complex external stimuli into electrical signals and transmit them to the brain, but also has excellent mechanical properties and can meet our daily movements without instability or cracking. Therefore, the design of wearable gel (electronic skin) must not only be able to respond to external stimuli, but also have excellent mechanical properties to meet daily human movements.

[0004] Electronic skin mostly uses polymer gel as the basic substrate. However, the strength of flexible sensors is usually low and cannot produce large deformations. At the same time, most gel elastomers are prepared based on water, and their mechanical properties will gradually deteriorate as the water evaporates outdoors. In addition, most electronic skins are complicated to prepare and the raw materials used are relatively expensive, which seriously limits the rapid development of the industry. Therefore, it is extremely important to design a gel elastomer that is simple to prepare, low in price, and has high mechanical properties and conductivity.

[0005] Application No. 201910946428.8 discloses a method for designing Pickering emulsion microcapsules based on cellulose nanocrystals extracted from discarded grape residues using a low eutectic solvent, and preparing a self-repairing antifreeze hydrogel. Application No. 202011093032.2 discloses a method for preparing a biomass-based hydrogel, dissolving the biomass in a eutectic solvent of choline chloride and urea or acetic acid, and then adding a polymer monomer to initiate polymerization to obtain a gel that can be used for the adsorption of a variety of dyes with strong adsorption capacity. Application No. CN202110365358 discloses a class of supramolecular polymer double network low eutectic gels and their preparation methods and applications. Application No. CN202210449820 discloses a method for preparing a hemicellulose-based hydrogel based on a low eutectic solvent. Application No. CN202210192916 discloses a high-strength self-healing hydrogel and a preparation method thereof. β-cyclodextrin is added to the eutectic system of choline chloride and acrylamide-acrylic acid to initiate polymerization, and the hydrogel is prepared by soaking and washing with distilled water. Application No. CN202210374006 discloses a method for quickly preparing a high-strength hydrogel filled with chitosan. Chitosan is added to the eutectic system of choline chloride and acrylamide, acrylic acid, itaconic acid, etc. to prepare a gel. However, the material prepared by simple choline chloride and acrylamide is very hard and lacks softness. Application No. CN202111513881 discloses a self-adhesive conductive gel and a preparation method thereof. First, a polymer dispersion system is constructed by mixing quaternary ammonium salt choline chloride with one or more of glycerol, ethylene glycol, and PEG200 into a mixed solvent. Polymer monomers and initiators are added in sequence, and the gel is polymerized. The addition of hydrogen bond donors such as ethylene glycol promotes the softness of propionamide polymers and enhances the low temperature resistance and conductivity of the gel. Summary of the invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide an antifreeze conductive gel and its preparation and application. The present invention first mixes choline chloride and polyacrylamide to form a eutectic solution; then, alginate, a crosslinker and an initiator are sequentially added to the eutectic solution to initiate a polymerization reaction to obtain an antifreeze conductive gel. The antifreeze conductive gel of the present invention has high light transmittance, large elongation at break, fracture strength, and large fracture energy. At the same time, the antifreeze conductive gel has a strong self-healing ability. The prepared antifreeze conductive gel is conductive and can be used as an electronic skin to respond to a variety of human body movements. The antifreeze conductive gel is simple to prepare, low in cost, has good flexibility, high conductivity and excellent mechanical properties, and has great application potential in wearable electronic skin, prostheses, and sensors for the human body.

[0007] A gel with polyacrylamide and alginate as double network polymer segments and choline chloride and water as dispersions; the prepared gel does not require the use of polyols such as glycerol and ethylene glycol, and the prepared gel does not contain polyol substances; the prepared gel has the advantages of high strength, stretchability, antifreeze, high temperature resistance, conductivity, good biocompatibility, etc.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] The first object of the present invention is to provide an antifreeze conductive gel, which is prepared from a polymer, an initiator, a crosslinking agent and a dispersion system;

[0010] The sum of the mass of the polymer, the initiator and the cross-linking agent is 10.001%-77% of the mass of the antifreeze conductive gel, and the mass of the dispersed system is 23%-89.999% of the mass of the antifreeze conductive gel;

[0011] Furthermore, the mass of the polymer is 10%-70% of the mass of the antifreeze conductive gel; the mass of the initiator is 0.01%-5% of the mass of the polymer; and the mass of the cross-linking agent is 0%-5% of the mass of the polymer.

[0012] In one embodiment of the present invention, the polymer is a mixture of polyacrylamide and alginate; the mass fraction of polyacrylamide is 5%-67%.

[0013] In one embodiment of the present invention, the initiator is selected from one or more of persulfate, hydrogen peroxide, water-soluble azo initiator or photoinitiator.

[0014] In one embodiment of the present invention, the photoinitiator is selected from one or both of 2-hydroxy-2-methylpropiophenone and 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone.

[0015] In one embodiment of the present invention, the mass of the photoinitiator is 0.01%-5% of the mass of the polymer.

[0016] In one embodiment of the present invention, the crosslinking agent is selected from one or more of an organic diacrylate crosslinking agent and an inorganic calcium sulfate.

[0017] The organic diacrylate crosslinking agent is selected from one of N,N-methylenebisacrylamide divinylstyrene, polyethylene glycol dimethacrylate, 4,4'-dimethylacrylamidoazobenzene and polyethylene glycol dimethacrylate.

[0018] In one embodiment of the present invention, the dispersed system is an aqueous solution of choline chloride.

[0019] The second object of the present invention is to provide a method for preparing the above-mentioned antifreeze conductive gel, comprising the following steps:

[0020] (1) mixing an aqueous solution of choline chloride and polyacrylamide to form a eutectic solution;

[0021] (2) Adding alginate, a crosslinking agent and an initiator to the eutectic solution prepared in step (1) in sequence, and performing polymerization reaction to obtain an antifreeze conductive gel.

[0022] In one embodiment of the present invention, in step (1), the molar ratio of choline chloride to polyacrylamide is 4:1-1:4.

[0023] In one embodiment of the present invention, in step (1), heating treatment is performed during the mixing process; the heating is performed to a temperature of 60-100°C.

[0024] In one embodiment of the present invention, in step (2), the polymerization reaction is a free radical polymerization reaction initiated under light or heat conditions.

[0025] The third object of the present invention is to provide an application of an antifreeze conductive gel in the preparation of wearable electronic skin, prosthesis or sensor for human body.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The antifreeze conductive gel prepared by the present invention significantly improves the elongation of the gel; the elongation at break of the antifreeze conductive gel invented is more than twice that of conventional polyacrylamide hydrogel;

[0028] (2) The antifreeze conductive gel of the present invention significantly improves the fracture stress; the fracture tensile stress strength of the invented gel is 1.6 MPa, which is much greater than that of conventional polyacrylamide hydrogel.

[0029] (3) The antifreeze conductive gel of the present invention has antifreeze properties and remains soft and elastic at -25°C, while conventional gel freezes and becomes hard.

[0030] (4) The antifreeze conductive gel of the present invention has conductive properties and can still maintain the conductive properties at -60°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The surface adhesion of the gel prepared in Example 1 to different substances;

[0032] Figure 2 The tensile stress curves of the gels prepared in Example 1, Comparative Example 1 and Comparative Example 2;

[0033] Figure 3is the water retention rate of the gel prepared in Example 1 and Comparative Example 1;

[0034] Figure 4 This is the temperature-conductivity performance curve of the gel prepared in Example 1. DETAILED DESCRIPTION

[0035] The present invention provides an antifreeze conductive gel, which is prepared from a polymer, an initiator, a crosslinking agent and a dispersion system;

[0036] The sum of the mass of the polymer, the initiator and the cross-linking agent is 10.001%-77% of the mass of the antifreeze conductive gel, and the mass of the dispersed system is 23%-89.999% of the mass of the antifreeze conductive gel;

[0037] Furthermore, the mass of the polymer is 10%-70% of the mass of the antifreeze conductive gel; the mass of the initiator is 0.01%-5% of the mass of the polymer; and the mass of the cross-linking agent is 0%-5% of the mass of the polymer.

[0038] In one embodiment of the present invention, the polymer is a mixture of polyacrylamide and alginate; the mass fraction of polyacrylamide is 5%-67%.

[0039] In one embodiment of the present invention, the initiator is selected from one or more of persulfate, hydrogen peroxide, water-soluble azo initiator or photoinitiator.

[0040] In one embodiment of the present invention, the photoinitiator is selected from one or both of 2-hydroxy-2-methylpropiophenone and 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone.

[0041] In one embodiment of the present invention, the mass of the photoinitiator is 0.01%-5% of the mass of the polymer.

[0042] In one embodiment of the present invention, the crosslinking agent is selected from one or more of an organic diacrylate crosslinking agent and an inorganic calcium sulfate.

[0043] The organic diacrylate crosslinking agent is selected from one of N,N-methylenebisacrylamide divinylstyrene, polyethylene glycol dimethacrylate, 4,4'-dimethylacrylamidoazobenzene and polyethylene glycol dimethacrylate.

[0044] In one embodiment of the present invention, the dispersed system is an aqueous solution of choline chloride.

[0045] The present invention provides a method for preparing the above-mentioned antifreeze conductive gel, comprising the following steps:

[0046] (1) mixing an aqueous solution of choline chloride and polyacrylamide to form a eutectic solution;

[0047] (2) Adding alginate, a crosslinking agent and an initiator to the eutectic solution prepared in step (1) in sequence, and performing polymerization reaction to obtain an antifreeze conductive gel.

[0048] In one embodiment of the present invention, in step (1), the molar ratio of choline chloride to polyacrylamide is 4:1-1:4.

[0049] In one embodiment of the present invention, in step (1), heating treatment is performed during the mixing process; the heating is performed to a temperature of 60-100°C.

[0050] In one embodiment of the present invention, in step (2), the polymerization reaction is a free radical polymerization reaction initiated under light or heat conditions.

[0051] The present invention provides an application of an antifreeze conductive gel in preparing wearable electronic skin, a prosthesis or a sensor for a human body.

[0052] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] In the following examples and comparative examples, unless otherwise specified, all reagents used are commercially available reagents, and all detection means and methods used are conventional detection means and methods in the art.

[0054] Example 1

[0055] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0056] (1) 14 g of choline chloride aqueous solution and acrylamide were prepared in a molar ratio of 1:2, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) was obtained;

[0057] (2) adding 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stirring for 30 min until the mixture is completely mixed;

[0058] (3) then adding 0.58 g of 5% calcium sulfate suspension;

[0059] (4) adding 2-hydroxy-2-methyl-1-phenyl-1-propanone with a molar percentage of 1% acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain an antifreeze conductive gel: acrylamide-alginate-choline chloride hydrogel.

[0060] Example 2

[0061] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0062] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 1:2 to a volume of 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0063] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0064] (3) Then add 0.58 g of 5% calcium sulfate suspension.

[0065] (4) adding a photoinitiator (2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone) with a molar percentage of 1% of acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain an antifreeze conductive gel: acrylamide-alginate-choline chloride hydrogel.

[0066] Example 3

[0067] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0068] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 1:2 to a volume of 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0069] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0070] (3) Then add 0.58 g of 5% calcium sulfate suspension.

[0071] (4) adding potassium persulfate (exothermic) with a molar ratio of 1% of acrylamide, standing for 24 hours, and solidifying to obtain an antifreeze conductive gel: acrylamide-alginate-choline chloride hydrogel.

[0072] Example 4

[0073] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0074] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 1:2 to a volume of 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0075] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0076] (3) adding a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar amount of 1% of acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain an antifreeze conductive gel: acrylamide-alginate-choline chloride hydrogel.

[0077] Example 5

[0078] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0079] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 1:2 to a volume of 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0080] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0081] (3) Then, 0.6 g of ethylene glycol dimethacrylate was added.

[0082] (4) adding a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar amount of 1% of acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain an antifreeze conductive gel: acrylamide-alginate-choline chloride hydrogel.

[0083] Example 6

[0084] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0085] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 1:2 to a volume of 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0086] (2) Add 2 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0087] (3) adding a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar amount of 1% of acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain an antifreeze conductive gel: acrylamide-alginate-choline chloride hydrogel.

[0088] Example 7

[0089] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0090] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 1:1 to 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0091] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0092] (3) Then add 0.58 g of 5% calcium sulfate suspension.

[0093] (4) Add a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar percentage of 1% of acrylamide, pour into a mold, and irradiate with ultraviolet light for 30 minutes to obtain an antifreeze conductive gel: acrylamide-alginate-choline chloride hydrogel.

[0094] Example 8

[0095] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0096] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 2:1 to a volume of 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0097] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0098] (3) Then add 0.58 g of 5% calcium sulfate suspension.

[0099] (4) Add a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar percentage of 1% of acrylamide, pour into a mold, and irradiate with ultraviolet light for 30 minutes to cure.

[0100] Example 9

[0101] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0102] (1) A choline chloride aqueous solution and acrylamide are prepared in a molar ratio of 4:1 to a volume of 14 g, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) is obtained.

[0103] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0104] (3) Then add 0.58 g of 5% calcium sulfate suspension.

[0105] (4) adding a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar amount of 1% of acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain acrylamide-alginate-choline chloride hydrogel.

[0106] Example 10

[0107] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0108] (1) A choline chloride aqueous solution and acrylamide were prepared in a molar ratio of 1:4 to prepare 14 g of the mixture, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) was obtained.

[0109] (2) Add 1.38 g of 1 wt % sodium alginate solution to the eutectic solution prepared in step (1), and stir for 30 min until the mixture is completely mixed.

[0110] (3) Then add 0.58 g of 5% calcium sulfate suspension.

[0111] (4) adding a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar amount of 1% of acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain acrylamide-alginate-choline chloride hydrogel.

[0112] Embodiment 11

[0113] This embodiment provides a method for preparing an antifreeze conductive gel, comprising the following steps:

[0114] (1) A choline chloride aqueous solution and acrylamide were prepared in a molar ratio of 1:4 to prepare 14 g of the mixture, and heated at 70° C. while stirring until a clear, colorless, transparent liquid (eutectic solution) was obtained.

[0115] (2) Add 1.38 g of water to the eutectic solution prepared in step (1) and stir for 30 min until the mixture is completely mixed.

[0116] (3) adding a photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) with a molar amount of 1% of acrylamide, irradiating with ultraviolet light for 30 minutes, and curing to obtain acrylamide-choline chloride hydrogel.

[0117] Comparative Example 1

[0118] Except that sodium alginate is not added, other aspects are the same as those of Example 1.

[0119] Comparative Example 2

[0120] Except that sodium alginate and choline chloride are not added, the other steps are the same as those in Example 1.

[0121] Figure 1 Schematic diagram of stress when the gel prepared in Example 1 is attached to the surface of different materials; Figure 1 It can be found that the gel prepared in Example 1 has strong viscosity, and the gel can form a large adhesive force with a material with a smooth surface; the adhesive force formed with a material with a rough surface (human skin) can still reach 4.2 kPa.

[0122] The gel prepared in Example 1 has a high tensile stress strength; the strength of the implementation case is better than that of the gel prepared in Comparative Examples 1 and 2. When choline chloride is used as a polymer dispersion, the mechanical deformation properties of the gel are significantly improved, and the stress at the stretching ratio and the maximum stretching ratio are greater than those in Comparative Examples 1 and 2; the tensile stress strength of the gel obtained in Example 1 is 1.6 MPa, and the elongation at break is 840%. Figure 2 shown.

[0123] The gel prepared in Example 1 has good water retention performance. After the gels prepared in Example 1 and Comparative Example 2 were placed in a 60°C oven for one week, the mass of the gel prepared in Example 1 was about 94% of the initial weight, while the mass of the gel prepared in Comparative Example 2 was only 65% ​​of the initial weight. Figure 3 shown.

[0124] The gel prepared in Example 1 is frost-resistant and remains transparent and soft after being placed in a refrigerator at -23°C for 24 hours, while the gels prepared in Comparative Examples 1 and 2 become hard and opaque. The conductivity of the gel prepared in Example 1 is tested, and the results are as follows: Figure 4 As shown, the gel still has conductive properties (0.004 S / m) at -60°C.

[0125] The gel prepared in Example 1 was cut with a blade, and the cut surface disappeared quickly after kneading; the gel prepared in Example 1 had stress when stretched, and the mechanical stress recovery rate was 37% in 3 minutes and about 72% in 12 hours.

[0126] In summary, the gel prepared by the present invention has good performance and can be used to prepare wearable electronic skin, prostheses, and sensors for the human body.

[0127] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An antifreeze conductive gel, characterized in that: The antifreeze conductive gel is prepared from acrylamide monomer, sodium alginate, an initiator, a crosslinking agent and a dispersion system; The sum of the mass of acrylamide monomer, sodium alginate, initiator and cross-linking agent is 10.001%-77% of the mass of the antifreeze conductive gel, and the mass of the dispersed system is 23%-89.999% of the mass of the antifreeze conductive gel; Furthermore, the sum of the mass of acrylamide monomer and sodium alginate is 10%-70% of the mass of the antifreeze conductive gel; the mass of the initiator is 0.01%-5% of the sum of the mass of acrylamide monomer and sodium alginate; the mass of the cross-linking agent is 0%-5% of the sum of the mass of acrylamide monomer and sodium alginate, and is not 0%; The cross-linking agent is inorganic calcium sulfate; the dispersion system is a choline chloride aqueous solution, and the choline chloride aqueous solution and acrylamide monomer form a eutectic solution; The molar ratio of choline chloride to acrylamide monomer is 4:1-1:4; The antifreeze conductive gel has elasticity at -25°C and maintains conductive properties at -60°C.

2. The antifreeze conductive gel according to claim 1, characterized in that: The initiator is selected from one or more of persulfate, hydrogen peroxide, water-soluble azo initiator or photoinitiator.

3. The antifreeze conductive gel according to claim 2, characterized in that: The photoinitiator is selected from one or both of 2-hydroxy-2-methylpropiophenone and 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone.

4. A method for preparing the antifreeze conductive gel according to any one of claims 1 to 3, characterized in that: The following steps are involved: (1) mixing an aqueous solution of choline chloride and acrylamide monomer to form a eutectic solution; (2) Sodium alginate, a cross-linking agent and an initiator are sequentially added dropwise to the eutectic solution prepared in step (1) to obtain an antifreeze conductive gel through a polymerization reaction.

5. The method for preparing an antifreeze conductive gel according to claim 4, characterized in that: In step (2), the polymerization reaction is a free radical polymerization reaction initiated under light or heat conditions.

6. Use of the antifreeze conductive gel as claimed in any one of claims 1 to 3 in the preparation of wearable electronic skin, prosthesis or sensor for human body.

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