Ionic conductive gelatin hydrogel with high compression strength and preparation method thereof

Abstract

The invention discloses an ionic conductive gelatin hydrogel with high compression strength and a preparation method thereof. The preparation method of the ionic conductive gelatin hydrogel with high compression strength comprises the following steps: respectively preparing a gelatin solution and a montmorillonite dispersion liquid; adding sodium lactate into the gelatin solution, and heating and stirring to obtain a gelatin-sodium lactate mixed solution; adding the montmorillonite dispersion liquid into the gelatin-sodium lactate mixed solution, heating and stirring to obtain a precursor solution, and cooling to obtain the gelatin-sodium lactate-montmorillonite hydrogel. According to the preparation method provided by the invention, the defects of poor mechanical property, poor ionic conductivity and the like of the gelatin hydrogel can be improved, and then the gelatin hydrogel with high compression strength and ionic conductivity is prepared.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for preparing a hydrogel, and particularly relates to a method for preparing a high-compression-strength ion-conducting gelatin hydrogel. BACKGROUND

[0002] In the field of intelligent sensing, ion-conducting hydrogels have become the core materials for preparing flexible sensors, electronic skins and other devices due to their electrolyte function and flexible mechanical properties. Gelatin is a natural polymer obtained by mild hydrolysis and purification of animal collagen. It has good biocompatibility and is widely available and low in cost. It has significant application potential in the above-mentioned fields.

[0003] However, the network structure of traditional gelatin hydrogels is mainly cross-linked by weak hydrogen bonds, and the mechanical properties are weak, especially the compression strength is low. When subjected to external pressure, the gelatin hydrogels are prone to rupture or structural collapse, which cannot meet the demand for mechanical stability in practical applications of flexible devices (such as repeated pressure scenarios of sensors). At the same time, in order to realize ion conductivity, traditional schemes often need to add inorganic salts, ionic liquids and other conductive media to the gelatin hydrogels, but such additives can easily lead to a decrease in the uniformity of the gel network, further weakening the mechanical properties, or the conductive stability is insufficient due to the easy loss of the conductive medium, which cannot meet the demand for long-term stable use.

[0004] Therefore, it is a great challenge to develop a preparation method that is simple in process and can simultaneously realize high compression strength and stable ion conductivity of gelatin hydrogels. SUMMARY

[0005] In view of the above problems, the present application provides a high-compression-strength ion-conducting gelatin hydrogel and a preparation method thereof. The method is simple, and the prepared hydrogel has excellent compression performance, water retention and conductivity, overcoming the characteristics of traditional gelatin hydrogels such as weak structure and poor conductivity.

[0006] The technical scheme of the present application is as follows: I. A method for preparing a high-compression-strength ion-conducting gelatin hydrogel The preparation method comprises the following steps: Step S1) preparing a gelatin solution and a montmorillonite dispersion liquid, respectively; Step S2) adding sodium lactate to the gelatin solution, and obtaining a gelatin-sodium lactate mixed solution after heating and stirring; Step S3) adding the montmorillonite dispersion liquid to the gelatin-sodium lactate mixed solution, obtaining a precursor solution after heating and stirring, and obtaining a gelatin-sodium lactate-montmorillonite hydrogel after cooling.

[0007] The concentration of gelatin in the precursor solution is 15-20 wt%; the concentration of sodium lactate is 10-30 wt%; and the concentration of montmorillonite is 0.01-2 wt%.

[0008] In the step S3, the volume ratio of the gelatin-sodium lactate mixed solution to the montmorillonite dispersion solution is 8-10:1.

[0009] In the step S3, the heating temperature is 50-60 DEG C, the stirring time is 120-180 min; the cooling temperature is 20-25 DEG C, the cooling humidity is 55-60%, and the cooling time is 12-14 h.

[0010] In the step S3, the precursor solution is cooled in a constant-temperature and constant-humidity environment.

[0011] In the step S1, the process for preparing the gelatin solution is as follows: deionized water is added to gelatin particles, the gelatin particles are allowed to swell by absorbing water for 30-60 min, and then heated at a temperature of 50-60 DEG C for 60-120 min to obtain the gelatin solution.

[0012] In the step S1, the process for preparing the montmorillonite dispersion solution is as follows: deionized water is added to montmorillonite powder, and then ultrasonic treatment is performed for 2-4 h, followed by stirring for 20-22 h to obtain the montmorillonite dispersion solution.

[0013] In the step S2, the heating temperature is 50-60 DEG C, and the stirring time is 30-60 min.

[0014] II. A high-compression-strength ion-conducting gelatin hydrogel prepared by the above preparation method.

[0015] The present application has the following advantages: 1. The addition of montmorillonite and sodium lactate improves the mechanical properties of the gelatin hydrogel through multiple electrostatic interactions, and improves the ion conductivity of the gelatin hydrogel by providing stable sodium ions.

[0016] 2. The material of the present application has good biocompatibility, low cost, simple preparation method, and easy batch production. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 4 is a tensile stress-strain diagram of the gelatin hydrogel with different montmorillonite contents, wherein 0-2 wt% represents the content of montmorillonite in the system.

[0018] Figure 2 FIG. 6 is a tensile stress-strain diagram of the gelatin hydrogel with different cooling times, wherein 0.5-12 h represents the cooling time.

[0019] Figure 3 FIG. 8 is a tensile stress-strain diagram of the gelatin hydrogel with different components.

[0020] Figure 4 Compression stress-strain curves of different component hydrogels.

[0021] Figure 5 Conductivity curves of different montmorillonite content hydrogels, wherein 0-2 wt% represents the content of montmorillonite in the system.

[0022] Figure 6 Water retention curves of different sodium lactate content hydrogels, wherein 0-30 wt% represents the content of sodium lactate in the system. DETAILED DESCRIPTION

[0023] The application will be further described in detail below in combination with the drawings and specific examples.

[0024] The hydrogel provided by the application takes gelatin as a skeleton, and sodium lactate and montmorillonite are doped into the gelatin aqueous solution as substances for improving the compression strength of the hydrogel and providing ion conductivity, so as to improve the mechanical properties and electrical properties of the hydrogel.

[0025] Specifically, the negative charge on the surface of the montmorillonite and the carboxylate ions in the sodium lactate molecules can form electrostatic adsorption and ion crosslinking with the positively charged ammonium ions on the gelatin molecular chain, respectively, and meanwhile, the hydroxyl groups on the surface of the montmorillonite can form a hydrogen bond network with the carboxyl groups and hydroxyl groups in the sodium lactate molecules and the amino groups and hydroxyl groups of the gelatin molecular chain. Such multiple electrostatic interactions significantly improve the crosslinking density and bonding strength of the gelatin network, and greatly enhance the mechanical strength of the gelatin hydrogel. In addition, the sodium lactate and the montmorillonite can dissociate sodium ions in the system, and the montmorillonite has a large specific surface area and can "capture" free sodium ions through electrostatic interaction, so as to ensure the stability of the carrier concentration and endow the gelatin hydrogel with excellent and stable ion conductivity.

[0026] Therefore, the preparation method provided by the application can improve the shortcomings of poor mechanical properties and poor ion conductivity of the gelatin hydrogel, and further prepare the gelatin hydrogel with high compression strength and ion conductivity.

[0027] The preparation method provided by the application specifically includes the following steps: Step S1) preparing a gelatin solution and a montmorillonite dispersion liquid, respectively.

[0028] In step S1, the process of preparing the gelatin solution is specifically as follows: deionized water is added to a certain amount of gelatin particles, the gelatin particles are swelled by water for 30-60 min, and then heated at a temperature of 50-60℃ for 60-120 min to obtain the gelatin solution.

[0029] In step S1, the process of preparing the montmorillonite dispersion liquid is specifically as follows: deionized water is added to a certain amount of montmorillonite powder, ultrasonic treatment is performed for 2-4 h, and then stirring is performed for 20-22 h to obtain the montmorillonite dispersion liquid.

[0030] Step S2) adding sodium lactate into the gelatin solution, and obtaining a gelatin-sodium lactate mixed solution after heating and stirring.

[0031] In step S2, the heating temperature is 50-60℃, and the stirring time is 30-60 min.

[0032] Step S3) adding a montmorillonite dispersion liquid into the gelatin-sodium lactate mixed solution, and obtaining a precursor solution after heating and stirring, and obtaining a gelatin-sodium lactate-montmorillonite hydrogel after cooling.

[0033] In step S3, the concentration of gelatin in the precursor solution is 15-20 wt%; the concentration of sodium lactate is 10-30 wt%; and the concentration of montmorillonite is 0.01-2 wt%.

[0034] In step S3, the volume ratio of the gelatin-sodium lactate mixed solution to the montmorillonite dispersion liquid is 8-10:1, preferably 9:1.

[0035] In step S3, the heating temperature is 50-60℃, the stirring time is 120-180 min, the cooling temperature is 20-25℃, the cooling humidity is 55-60%, and the cooling time is 12-14 h.

[0036] In step S3, the precursor solution is preferably cooled in a constant-temperature and constant-humidity environment.

[0037] The specific implementation of the present application is as follows: Example 1 1.5 g of gelatin was added to 5.5 mL of deionized water, swelled for 30 min, heated at 55℃ for 2 h, and a clear gelatin solution was obtained; 2 g of sodium lactate (SL) was added to the uniform gelatin solution, heated and stirred at 55℃ for 60 min, and a gelatin-sodium lactate mixed solution was formed; 0.01 g of montmorillonite (MMT) was added to 9.99 mL of deionized water, ultrasonically treated for 2 h, and magnetically stirred for 22 h, and a 0.1 wt% MMT dispersion liquid was obtained; 1 mL of the 0.1 wt% MMT dispersion liquid was added to the gelatin-sodium lactate mixed solution, heated and stirred at 55℃ for 120 min, and a gelatin-sodium lactate-montmorillonite mixed solution was formed; the gelatin-sodium lactate-montmorillonite mixed solution was poured into a mold, cooled at 22℃ and 60% for 12 h, and a high-compression-strength ion-conducting gelatin hydrogel was obtained.

[0038] In the high-compression-strength ion-conducting gelatin hydrogel obtained in this example, the mass fractions of gelatin, sodium lactate, and montmorillonite were 15%, 20%, and 0.01%, respectively.

[0039] Example 2 Example 1

[0040] In the high compressive strength ion conductive gelatin hydrogel obtained in this example, the mass fractions of gelatin, sodium lactate, and montmorillonite are 15%, 20%, and 0.05%, respectively.

[0041] Example 3 Example 3

[0042] In the high compressive strength ion conductive gelatin hydrogel obtained in this example, the mass fractions of gelatin, sodium lactate, and montmorillonite are 15%, 20%, and 0.1%, respectively.

[0043] Example 4 Example 1

[0044] In the high compressive strength ion conductive gelatin hydrogel obtained in this example, the mass fractions of gelatin, sodium lactate, and montmorillonite are 15%, 20%, and 0.5%, respectively.

[0045] Example 5 Example 5

[0046] In the high compressive strength ion conductive gelatin hydrogel obtained in this example, the mass fractions of gelatin, sodium lactate, and montmorillonite are 15%, 20%, and 1%, respectively.

[0047] Example 6 Example 1

[0048] The high compressive strength ionically conductive gelatin hydrogel obtained in this example has the mass fractions of gelatin, sodium lactate, and montmorillonite of 15%, 20%, and 2%, respectively.

[0049] Comparative Example 1 The high compressive strength ionically conductive gelatin hydrogel obtained in this example has the mass fractions of gelatin, sodium lactate, and montmorillonite of 15%, 0%, and 0%, respectively.

[0050] The high compressive strength ionically conductive gelatin hydrogel obtained in this example has the mass fractions of gelatin, sodium lactate, and montmorillonite of 15%, 20%, and 2%, respectively.

[0051] Comparative Example 2 The high compressive strength ionically conductive gelatin hydrogel obtained in this example has the mass fractions of gelatin, sodium lactate, and montmorillonite of 15%, 10%, and 0%, respectively.

[0052] The high compressive strength ionically conductive gelatin hydrogel obtained in this example has the mass fractions of gelatin, sodium lactate, and montmorillonite of 15%, 20%, and 2%, respectively.

[0053] Comparative Example 3 Add 1.5 g gelatin into 7 mL deionized water, swell for 30 min, heat at 55 °C for 2 h to obtain a clear gelatin solution; add 1.5 g sodium lactate (SL) into the uniform gelatin solution, heat at 55 °C for 60 min with stirring to form a gelatin-sodium lactate mixed solution; pour the gelatin-sodium lactate mixed solution into a mold, cool at 22 °C and 60% for 12 h to obtain a gelatin-sodium lactate hydrogel.

[0054] In the high compression strength ion-conductive gelatin hydrogel obtained in this comparative example, the mass fractions of gelatin, sodium lactate, and montmorillonite are 15%, 15%, and 0%, respectively.

[0055] Comparative Example 4 Add 1.5 g gelatin into 6.5 mL deionized water, swell for 30 min, heat at 55 °C for 2 h to obtain a clear gelatin solution; add 2 g sodium lactate (SL) into the uniform gelatin solution, heat at 55 °C for 60 min with stirring to form a gelatin-sodium lactate mixed solution; pour the gelatin-sodium lactate mixed solution into a mold, cool at 22 °C and 60% for 12 h to obtain a gelatin-sodium lactate hydrogel.

[0056] In the high compression strength ion-conductive gelatin hydrogel obtained in this comparative example, the mass fractions of gelatin, sodium lactate, and montmorillonite are 15%, 20%, and 0%, respectively.

[0057] Comparative Example 5 Add 1.5 g gelatin into 6 mL deionized water, swell for 30 min, heat at 55 °C for 2 h to obtain a clear gelatin solution; add 2.5 g sodium lactate (SL) into the uniform gelatin solution, heat at 55 °C for 60 min with stirring to form a gelatin-sodium lactate mixed solution; pour the gelatin-sodium lactate mixed solution into a mold, cool at 22 °C and 60% for 12 h to obtain a gelatin-sodium lactate hydrogel.

[0058] In the high compression strength ion-conductive gelatin hydrogel obtained in this comparative example, the mass fractions of gelatin, sodium lactate, and montmorillonite are 15%, 25%, and 0%, respectively.

[0059] Comparative Example 6 Add 1.5 g gelatin into 5.5 mL deionized water, swell for 30 min, heat at 55 °C for 2 h to obtain a clear gelatin solution; add 3 g sodium lactate (SL) into the uniform gelatin solution, heat at 55 °C for 60 min with stirring to form a gelatin-sodium lactate mixed solution; pour the gelatin-sodium lactate mixed solution into a mold, cool at 22 °C and 60% for 12 h to obtain a gelatin-sodium lactate hydrogel.

[0060] The high compression strength ion conductive gelatin hydrogel obtained in the present comparative example has the mass fractions of gelatin, sodium lactate and montmorillonite of 15%, 30% and 0%, respectively.

[0061] Comparative Example 7 1.5 g of gelatin was added into 5.5 mL of deionized water, swelled for 30 min, heated at 55°C for 2 h to obtain a clear gelatin solution; 2 g of sodium lactate (SL) was added into the uniform gelatin solution, heated and stirred at 55°C for 60 min to form a gelatin-sodium lactate mixed solution; 0.5 g of montmorillonite (MMT) was added into 9.5 mL of deionized water, ultrasonically treated for 2 h, magnetically stirred for 22 h to obtain a 5 wt% MMT dispersion; 1 mL of the 5 wt% MMT dispersion was added into the gelatin-sodium lactate mixed solution, heated and stirred at 55°C for 120 min to form a gelatin-sodium lactate-montmorillonite mixed solution; the gelatin-sodium lactate-montmorillonite mixed solution was poured into a mold, cooled at 22°C and 60% for 30 min to obtain a gelatin-sodium lactate-montmorillonite hydrogel.

[0062] The high compression strength ion conductive gelatin hydrogel obtained in the present comparative example has the mass fractions of gelatin, sodium lactate and montmorillonite of 15%, 20% and 0.5%, and a cooling time of 30 min.

[0063] Comparative Example 8 1.5 g of gelatin was added into 5.5 mL of deionized water, swelled for 30 min, heated at 55°C for 2 h to obtain a clear gelatin solution; 2 g of sodium lactate (SL) was added into the uniform gelatin solution, heated and stirred at 55°C for 60 min to form a gelatin-sodium lactate mixed solution; 0.5 g of montmorillonite (MMT) was added into 9.5 mL of deionized water, ultrasonically treated for 2 h, magnetically stirred for 22 h to obtain a 5 wt% MMT dispersion; 1 mL of the 5 wt% MMT dispersion was added into the gelatin-sodium lactate mixed solution, heated and stirred at 55°C for 120 min to form a gelatin-sodium lactate-montmorillonite mixed solution; the gelatin-sodium lactate-montmorillonite mixed solution was poured into a mold, cooled at 22°C and 60% for 6 h to obtain a gelatin-sodium lactate-montmorillonite hydrogel.

[0064] The high compression strength ion conductive gelatin hydrogel obtained in the present comparative example has the mass fractions of gelatin, sodium lactate and montmorillonite of 15%, 20% and 0.5%, and a cooling time of 6 h.

[0065] Comparative Example 9 The 1.5 g gelatin was added into 7.5 mL deionized water, swelled for 30 min, heated at 55 °C for 2 h to obtain a clear gelatin solution; 0.5 g of montmorillonite (MMT) was added into 9.5 mL deionized water, ultrasonically treated for 2 h, magnetically stirred for 22 h to obtain a 5 wt% MMT dispersion; 1 mL of the 5 wt% MMT dispersion was added into the gelatin solution, heated and stirred at 55 °C for 120 min to form a gelatin-montmorillonite mixed solution; the gelatin-montmorillonite mixed solution was poured into a mold, cooled at 22 °C and 60% for 12 h to obtain a gelatin-montmorillonite hydrogel.

[0066] The mass fractions of gelatin, sodium lactate and montmorillonite in the high compression strength ion-conducting gelatin hydrogel obtained in the present comparative example were 15%, 0% and 0.5%, respectively.

[0067] Next, the hydrogels obtained in Examples 1-6 and Comparative Examples 1-8 above were subjected to tensile / compressive mechanical property testing, ion conductivity testing and water retention testing, and the specific processes were as follows: Tensile / compressive mechanical property testing of the hydrogel: a UTM2102 electronic universal testing machine of Shenzhen Sansi Company was used for testing. Tensile testing: the hydrogel sample was cut into a dumbbell-shaped sample, with an effective length of 16.0 mm, a width of 4.0 mm and a thickness of 1.0 mm, and the tensile rate was 30 mm min -1 . The stress-strain curve of the hydrogel sample was recorded until fracture. Compression testing: the above hydrogel sample was cut into a cylindrical shape, with a diameter of 5 mm and a height of 7 mm, and the compression rate was 2 mm min -1 . The stress-strain curve of the hydrogel sample was recorded until the maximum force was 90 N.

[0068] Ion conductivity testing of the hydrogel: the hydrogel sample was assembled between two stainless steel electrodes to form a symmetric battery configuration, and a CHI760E electrochemical workstation of Shanghai Chenhua Instrument Co., Ltd. was used for ion conductivity testing. The initial voltage was set to 0 V, the amplitude was 5 mV, and the frequency range was 0.1 Hz-1000 kHz. The ion conductivity (σ c , unit: S cm -1 ) of the hydrogel was defined as σ c =(1000×L) / (Rb×S), where L (unit: cm) was the thickness of the hydrogel; Rb (unit: Ω) was the bulk resistance, which was determined by the intersection of the linear part of the impedance spectrum and the real axis; and S (unit: cm 2 ) was the effective contact area of the hydrogel and the stainless steel electrode.

[0069] Hydrogel water retention test: The above hydrogel samples were cut into uniform pieces, at this time the initial mass of each hydrogel piece was recorded. Then the hydrogel pieces were placed in a constant temperature and humidity environment (temperature 22°C, relative humidity 60%), and weighed at different time intervals to evaluate their water retention. The mass change of the hydrogel is defined as Δm = m / m0, where m0 (unit: g) is the initial mass of the hydrogel, and m (unit: g) is the mass after a certain time interval.

[0070] The results of tensile / compressive stress-strain, conductivity, water retention, etc. are shown in Figures 1-6

[0071] The tensile stress-strain results of Examples 1-6 and Comparative Example 4 above are shown in Figure 1 As can be seen from the figure, with the increase of the content of montmorillonite, the Young's modulus of the hydrogel first increases and then decreases, and the Young's modulus of the hydrogel corresponding to 0.5 wt% montmorillonite concentration (Example 4) is the largest.

[0072] The tensile stress-strain results of Example 4 and Comparative Examples 7-8 above are shown in Figure 2 As can be seen from the figure, with the extension of the cooling time, the Young's modulus of the hydrogel increases.

[0073] The tensile stress-strain results of Example 4 and Comparative Examples 1, 4 above are shown in Figure 3 As can be seen from the figure, with the addition of sodium lactate and montmorillonite in turn, the Young's modulus of the hydrogel increases.

[0074] The compressive stress-strain results of Example 4 and Comparative Examples 1, 4 above are shown in Figure 4 As can be seen from the figure, with the addition of sodium lactate and montmorillonite in turn, the compressive modulus of the hydrogel increases.

[0075] The conductivity results of Examples 1-6 and Comparative Example 4 above are shown in Figure 5 As can be seen from the figure, with the increase of the content of montmorillonite, the conductivity of the hydrogel first increases and then decreases, and the conductivity of the hydrogel corresponding to 0.5 wt% montmorillonite concentration is the largest.

[0076] The water retention results of Comparative Examples 1-6 above are shown in Figure 6 As can be seen from the figure, with the increase of the content of sodium lactate, the water retention of the hydrogel is enhanced, and the water content reaches equilibrium when cooled for 12 h.

[0077] The appearance of Comparative Example 9 above is significantly different from other examples. The sample prepared in this comparative example is in the form of a film and has almost no water retention, which has deviated from the category of traditional hydrogels.

[0078] ​From the above examples and comparative examples, it can be seen that the present application can improve the water retention performance of the hydrogel by adding sodium lactate, can improve the compression strength of the hydrogel by adding montmorillonite and sodium lactate, and can improve the mechanical and electrical properties of the hydrogel by adding the substance providing ion conductivity into the system.

[0079] It should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some parts. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a high compressive strength ion-conductive gelatin hydrogel, characterized in that, Includes the following steps: Step S1) Prepare gelatin solution and montmorillonite dispersion respectively; Step S2) Sodium lactate is added to the gelatin solution, and the mixture is heated and stirred to obtain a gelatin-sodium lactate mixed solution; Step S3) Add the montmorillonite dispersion to the gelatin-sodium lactate mixed solution, heat and stir to obtain a precursor solution, and after cooling, obtain gelatin-sodium lactate-montmorillonite hydrogel.

2. The method for preparing the high compressive strength ion-conductive gelatin hydrogel according to claim 1, characterized in that: The precursor solution contains 15-20 wt% gelatin, 10-30 wt% sodium lactate, and 0.01-2 wt% montmorillonite.

3. The method for preparing the high compressive strength ion-conductive gelatin hydrogel according to claim 2, characterized in that: In step S3, the volume ratio of the gelatin-sodium lactate mixed solution to the montmorillonite dispersion is 8~10:

1.

4. The method for preparing the high compressive strength ion-conductive gelatin hydrogel according to claim 1, characterized in that: In step S3, the heating temperature is 50~60℃, the stirring time is 120~180 min, the cooling temperature is 20~25℃, the cooling humidity is 55~60%, and the cooling time is 12 h~14 h.

5. The method for preparing the high compressive strength ion-conductive gelatin hydrogel according to claim 4, characterized in that: In step S3, the precursor solution is cooled in a constant temperature and humidity environment.

6. The method for preparing the high compressive strength ion-conductive gelatin hydrogel according to claim 1, characterized in that: In step S1, the process of preparing the gelatin solution is as follows: deionized water is added to the gelatin particles, and after the gelatin particles absorb water and swell for 30-60 minutes, they are heated at 50-60°C for 60-120 minutes to obtain the gelatin solution.

7. The method for preparing the high compressive strength ion-conductive gelatin hydrogel according to claim 1, characterized in that: In step S1, the process of preparing the montmorillonite dispersion is as follows: deionized water is added to montmorillonite powder, ultrasonic treatment is carried out for 2-4 hours, and then stirring is carried out for 20-22 hours to obtain the montmorillonite dispersion.

8. The method for preparing the high compressive strength ion-conductive gelatin hydrogel according to claim 1, characterized in that: In step S2, the heating temperature is 50~60℃ and the stirring time is 30~60 min.

9. A high compressive strength ion-conductive gelatin hydrogel obtained by the preparation method described in any one of claims 1 to 8.

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