High-toughness temperature-resistant acid-corrosion-resistant conductive adhesive sheet and preparation method thereof

Abstract

The application discloses a high-toughness temperature-resistant acid-corrosion-resistant conductive adhesive sheet, which is prepared from raw materials of vermicular graphite, short-cut graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), an initiator and a plasticizer according to a mass ratio of 10-15:45-55:1-2:200:100:10-15:1-1.5:10-15 by mixing, drying, closed-die forming and rolling forming. The application is used to improve the toughness, high and low temperature resistance, acid resistance and corrosion resistance of the conductive adhesive.

Description

Technical Field

[0001] This invention belongs to the field of engineering material preparation technology, specifically relating to a high-toughness, temperature-resistant, acid-corrosion-resistant conductive film, and also to a method for preparing the high-toughness, temperature-resistant, acid-corrosion-resistant conductive film. Background Technology

[0002] In the assembly process of lead-salt single-flow battery stack components, the positive and negative plates are generally made of metal current collectors (such as copper sheets) and composite conductive plates, and are pressed together by pressure. In order to reduce the contact resistance between the copper sheet and the composite conductive plate, conductive adhesive is usually applied between them to reduce the contact resistance and improve battery efficiency.

[0003] Currently, commercially available acid-resistant conductive adhesives mostly use carbon-based fillers such as graphite powder, carbon black, and carbon nanotubes as conductive fillers, and thermosetting resins such as epoxy resin as binders. Due to the difference in thermal expansion coefficients between the copper sheet and the composite conductive plate, with the long-term charge-discharge process of the lead-salt single-flow battery (charging is an endothermic process, discharging is an exothermic process) and changes in ambient temperature (-40~50℃), cracks may appear inside the conductive adhesive, even causing it to detach severely from the copper sheet or composite conductive plate, resulting in increasingly high contact resistance and ultimately rendering the battery inoperable. This necessitates that the conductive adhesive possess high bonding strength and toughness. In addition, after long-term use, the composite conductive plate may experience leakage; therefore, the conductive adhesive should have excellent acid corrosion resistance, especially electrochemical corrosion resistance. Summary of the Invention

[0004] The first objective of this invention is to provide a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film to improve the toughness, high and low temperature resistance, acid resistance, and corrosion resistance of conductive adhesives.

[0005] To achieve the above objectives, the technical solution adopted in this invention is: a high-toughness, temperature-resistant, acid-corrosion-resistant conductive film, comprising worm graphite, chopped graphite fibers, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer; the mass ratio of worm graphite, chopped graphite fibers, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer is: 10-15: 45-55: 1-2: 200: 100: 10-15: 1-1.5: 10-15.

[0006] The second objective of this invention is to provide a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, so as to improve the toughness, high and low temperature resistance, acid resistance, and corrosion resistance of the conductive film.

[0007] To achieve the above objectives, the technical solution adopted in this invention is: a method for preparing a high-toughness, temperature-resistant, acid-corrosion-resistant conductive film, wherein the raw materials are worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, in a mass ratio of 10-15:45-55:1-2:200:100:10-15:1-1.5:10-15, and are obtained by mixing, dehydration, internal mixing, and roll forming.

[0008] As a preferred technical solution of the present invention, it is implemented according to the following steps:

[0009] Step 1: Weigh out the following components according to the mass ratio of 10-15: 45-55: 1-2: 200: 100: 10-15: 1-1.5: 10-15: respectively: worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator and plasticizer. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix to obtain a titanate ester hydrated solution; Step 3: The worm graphite and chopped graphite fibers weighed in Step 1 are added to the titanate hydrate solution obtained in Step 2 in sequence, and high-speed shearing is performed to obtain a mixed slurry. Finally, the mixed slurry is dried and dehydrated until conductive material powder is obtained. Step 4: Mix the EVA, MAH, initiator, and plasticizer weighed in Step 1 with the conductive material powder obtained in Step 3 in an internal mixer to obtain a solid material. Step 5: Roll the solid material obtained in Step 4 into a two-roll mill to obtain a high-density conductive film.

[0010] As a preferred technical solution of the present invention, in step 1, the particle size of the worm graphite is 100-200 mesh, the length of the chopped graphite fiber is not greater than 100µm, and the particle size is 2µm-5µm.

[0011] As a preferred technical solution of the present invention, in step 1, the titanate is triisostearoyl titanate isopropyl triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate isopropyl triisostearoyl titanate.

[0012] As a preferred embodiment of the present invention, in step 1, the initiator is bis-tert-butyl peroxide diisopropylbenzene (BIBP); the plasticizer is dibutyl phthalate.

[0013] As a preferred technical solution of the present invention, in step 2, the preparation process of the titanate hydrate solution is as follows: first, weigh titanate and deionized water according to a mass ratio of 0.5-1:100, then mix the two and stir magnetically at 40℃-50℃ for 10min-15min to obtain the titanate hydrate solution.

[0014] As a preferred technical solution of the present invention, in step 3, the dehydration process is as follows: the mixed slurry is spread to a thickness of less than 3 mm, and vacuum extraction is performed at 100 ℃ - 120 ℃ for 1 h - 3 h.

[0015] As a preferred technical solution of the present invention, in step 4, the mixing temperature is 180 ℃ - 200 ℃, the rotation speed is 60 r / min, and the time is 1 h - 1.5 h.

[0016] As a preferred technical solution of the present invention, in step 5, the open mill rolling process is as follows: the temperature of the upper and lower rollers is 120 ℃ - 150 ℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.1 mm - 0.5 mm.

[0017] The beneficial effects of this invention are as follows: The high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film of this invention, prepared by the method of this invention, is suitable for use in lead-salt single-flow batteries. It has high toughness, high and low temperature resistance, and acid corrosion resistance. It can not only solve the encapsulation technology problem between the composite material conductive plate and the metal current collector in the positive and negative electrodes of lead-salt single-flow batteries, but can also be applied to the bonding of conductive components in other electronic appliances. Compared with existing conductive adhesives and conductive films, it has superior performance and good industrialization prospects. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 The high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film prepared by this invention. Detailed Implementation

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The present invention discloses a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, which is specifically implemented according to the following steps: Step 1: Weigh out worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, respectively. The titanate is either triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate; the initiator is bis(tert-butylperoxide)diisopropylbenzene (BIBP); and the plasticizer is dibutyl phthalate. The mass ratio of worm graphite to chopped graphite fiber to titanate to deionized water is: ethylene-vinyl acetate copolymer (EVA): maleic anhydride (MAH): initiator: plasticizer = 10⁻¹⁵: 45⁻⁵: 1⁻²: 200: 100: 10⁻¹⁵: 1⁻¹.5: 10⁻¹⁵. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix. Stir magnetically at 40℃-50℃ for 10min-15min to obtain a titanate ester hydrated solution. Step 3: First, add the worm graphite and chopped graphite fibers weighed in Step 1 to the titanate hydrate solution obtained in Step 2. Perform high-speed shearing at a speed of 2000r / min-2500r / min for 10min-20min to disperse the worm graphite and chopped graphite fibers in the titanate hydrate solution to obtain a mixed slurry. Finally, spread the mixed slurry to a thickness of less than 3mm and vacuum extract it at 100℃-120℃ for 1h-3h to obtain conductive material powder. Step 4: Mix the EVA, MAH, initiator, plasticizer weighed in Step 1 and the conductive material powder obtained in Step 3 in an internal mixer. The mixing temperature is 180-200℃, the speed is 60r / min, and the time is 1-1.5h; to obtain solid material. Step 5: The solid material obtained in Step 4 is rolled into shape on an open mill. The temperature of the upper and lower rollers is 120-150℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.1-0.5 mm. This yields a high-density conductive film, such as... Figure 1 As shown.

[0021] Explanation of the function of each component: Worm-shaped graphite: a conductive filler with a morphology between flake and spherical graphite, ranging from 100-200 mesh in size, containing 99.99% carbon, and exhibiting a bulk electrical conductivity of 1×10⁻⁶. 4 S / cm; Short-cut graphite fibers: conductive fillers and toughening materials, with a carbon content of 99.0%, a length of less than 100µm, a particle size of 2µm-5µm, a tensile strength > 4GPa, and an electrical conductivity greater than 1×10⁻⁶. 3 S / cm; Ethylene-vinyl acetate copolymer (EVA): a thermoplastic resin with good adhesive strength and chemical resistance, VA value of 14, melting point of 80℃.

[0022] Maleic anhydride: maleic anhydride; Initiator: Di-tert-butylperoxide diisopropylbenzene, as a free radical initiator, promotes the grafting reaction between maleic anhydride and ethylene-vinyl acetate copolymer at a temperature of 180℃-200℃ to generate maleic anhydride-grafted ethylene-vinyl acetate copolymer (EVA-g-MAH): The polar anhydride group of this copolymer can improve the bonding strength between the resin matrix and the conductive filler, as well as the bonding strength between the conductive adhesive and the current collector copper sheet and the positive and negative electrode plates.

[0023] Titanate: It is a water-soluble monoalkyl pyrophosphate ester that can improve the adhesion between conductive fillers and resin matrix, and also improve the dispersion of conductive fillers in the matrix, which helps to improve the conductivity and uniformity of conductive adhesive. When diluted with deionized water at a certain temperature, the titanate coupling agent is fully and uniformly dispersed in it. The high-speed shear machine provides interlayer shear force to disperse the nanoparticles, thereby achieving surface modification of conductive fillers. Plasticizer: Dibutyl phthalate, which has strong gelling ability, high adhesion and stability, is beneficial to improving the dispersibility of the whole system, increasing the flexibility of the conductive adhesive after curing, and is beneficial to the tableting of open mill.

[0024] The prepared conductive film was subjected to performance testing. Conductivity testing employed the four-probe method, achieving a conductivity greater than 100 S / cm. According to national standard GB / T1040-2006, testing was conducted using an electronic universal testing machine, with tensile strength greater than 20 MPa and fracture strain greater than 20%. The interfacial bond strength (i.e., interfacial shear force) between the copper sheet and the conductive composite plate was determined using the lap shear test method. Conductive tape was cut to a suitable size based on the contact area between the copper sheet and the composite electrode plate, placed between them, and then hot-pressed (temperature 120℃ and pressure 6 kgf / cm²). 2 The interfacial bond strength is greater than 30 MPa; aging tests were conducted in 1M sulfuric acid solution, with immersion at three different temperatures (-40℃, room temperature, and 50℃) for 12 months, and the interfacial bond strength (i.e., interfacial shear force) between the copper sheet and the conductive composite material plate was measured to be greater than 20 MPa; the electrochemical corrosion rate measured in 1M sulfuric acid solution using the electrochemical linear polarization method was <10 μA / cm. 2 .

[0025] Example 1 The present invention discloses a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, which is specifically implemented according to the following steps: Step 1: Weigh out worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, respectively. The titanate is either triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate isopropyl; the initiator is bis(tert-butylperoxide)diisopropylbenzene (BIBP); and the plasticizer is dibutyl phthalate. The mass ratio of worm graphite to chopped graphite fiber to titanate to deionized water is: ethylene-vinyl acetate copolymer (EVA): maleic anhydride (MAH): initiator: plasticizer = 10:45:1:200:100:10:1:10. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix. Stir magnetically at 40°C for 10 minutes to obtain a titanate ester hydrated solution. Step 3: First, add the worm graphite and chopped graphite fibers weighed in Step 1 to the titanate hydrate solution obtained in Step 2. Perform high-speed shearing at 2000 r / min for 10 min to disperse the worm graphite and chopped graphite fibers in the titanate hydrate solution to obtain a mixed slurry. Finally, spread the mixed slurry to a thickness of less than 3 mm and vacuum extract it at 100℃ for 1 h to obtain conductive material powder. Step 4: The EVA, MAH, initiator, and plasticizer weighed in Step 1 and the conductive material powder obtained in Step 3 are mixed in an internal mixer at a mixing temperature of 180℃, a speed of 60r / min, and a time of 1h to obtain a solid material. Step 5: The solid material obtained in Step 4 is rolled into shape on an open mill. The temperature of the upper and lower rollers is 120℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.1 mm. A high-density conductive film is obtained.

[0026] Example 2 The present invention discloses a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, which is specifically implemented according to the following steps: Step 1: Weigh out worm-shaped graphite, chopped graphite fibers, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, respectively. The titanate is either triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate isopropyl; the initiator is bis(tert-butylperoxide)diisopropylbenzene (BIBP); and the plasticizer is dibutyl phthalate. The mass ratio of worm-shaped graphite to chopped graphite fibers is: titanate: deionized water: ethylene-vinyl acetate copolymer (EVA): maleic anhydride (MAH): initiator: plasticizer = 15:55:2:200:100:15:1.5:15. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix. Stir magnetically at 50°C for 15 minutes to obtain a titanate ester hydrated solution. Step 3: First, add the worm graphite and chopped graphite fibers weighed in Step 1 to the titanate hydrate solution obtained in Step 2. Perform high-speed shearing at 2500 r / min for 20 min to disperse the worm graphite and chopped graphite fibers in the titanate hydrate solution to obtain a mixed slurry. Finally, spread the mixed slurry to a thickness of less than 3 mm and vacuum extract it at 120℃ for 3 h to obtain conductive material powder. Step 4: The EVA, MAH, initiator, and plasticizer weighed in Step 1 and the conductive material powder obtained in Step 3 are mixed in an internal mixer at a temperature of 200℃, a speed of 60r / min, and a time of 1.5h to obtain a solid material. Step 5: The solid material obtained in Step 4 is rolled into shape in an open mill. The temperature of the upper and lower rollers is 150℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.5 mm. A high-density conductive film is obtained.

[0027] Example 3 The present invention discloses a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, which is specifically implemented according to the following steps: Step 1: Weigh out worm-shaped graphite, chopped graphite fibers, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, respectively. The titanate is either triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate; the initiator is di(tert-butylperoxide)diisopropylbenzene (BIBP); and the plasticizer is dibutyl phthalate. The mass ratio of worm-shaped graphite to chopped graphite fibers is: titanate: deionized water: ethylene-vinyl acetate copolymer (EVA): maleic anhydride (MAH): initiator: plasticizer = 12:50:1.5:200:100:12:1.2:12. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix. Stir magnetically at 45°C for 12 minutes to obtain a titanate ester hydrated solution. Step 3: First, add the worm graphite and chopped graphite fibers weighed in Step 1 to the titanate hydrate solution obtained in Step 2. Perform high-speed shearing at a speed of 2000r / min-2500r / min for 10min-20min to disperse the worm graphite and chopped graphite fibers in the titanate hydrate solution to obtain a mixed slurry. Finally, spread the mixed slurry to a thickness of less than 3mm and vacuum extract it at 110℃ for 2h to obtain conductive material powder. Step 4: The EVA, MAH, initiator, and plasticizer weighed in Step 1 and the conductive material powder obtained in Step 3 are mixed in an internal mixer at a mixing temperature of 190℃, a speed of 60r / min, and a time of 1.2h to obtain a solid material. Step 5: The solid material obtained in Step 4 is rolled into shape on an open mill. The temperature of the upper and lower rollers is 135℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.3 mm. A high-density conductive film is obtained.

[0028] Example 4 The present invention discloses a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, which is specifically implemented according to the following steps: Step 1: Weigh out the following components: worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, respectively. The titanate is either triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate isopropyl; the initiator is bis(tert-butylperoxide)diisopropylbenzene (BIBP); and the plasticizer is dibutyl phthalate. The mass ratio of these components is: worm graphite: chopped graphite fiber: titanate: deionized water: ethylene-vinyl acetate copolymer (EVA): maleic anhydride (MAH): initiator: plasticizer = 13:50:1.5:200:100:13:1.3:13. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix. Stir magnetically at 45°C for 10-15 minutes to obtain a titanate ester hydrated solution. Step 3: First, add the worm graphite and chopped graphite fibers weighed in Step 1 to the titanate hydrate solution obtained in Step 2. Perform high-speed shearing at 2250 r / min for 15 min to disperse the worm graphite and chopped graphite fibers in the titanate hydrate solution to obtain a mixed slurry. Finally, spread the mixed slurry to a thickness of less than 3 mm and vacuum extract it at 110℃ for 2 h to obtain conductive material powder. Step 4: The EVA, MAH, initiator, and plasticizer weighed in Step 1 and the conductive material powder obtained in Step 3 are mixed in an internal mixer at a mixing temperature of 190℃, a speed of 60r / min, and a time of 1.3h to obtain a solid material. Step 5: The solid material obtained in Step 4 is rolled into shape on an open mill. The temperature of the upper and lower rollers is 135℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.3 mm. A high-density conductive film is obtained.

[0029] Example 5 The present invention discloses a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, which is specifically implemented according to the following steps: Step 1: Weigh out worm-shaped graphite, chopped graphite fibers, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, respectively. The titanate is either triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate; the initiator is bis(tert-butylperoxide)diisopropylbenzene (BIBP); and the plasticizer is dibutyl phthalate. The mass ratio of worm-shaped graphite to chopped graphite fibers is: titanate: deionized water: ethylene-vinyl acetate copolymer (EVA): maleic anhydride (MAH): initiator: plasticizer = 10:55:2:200:100:15:1.5:15. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix. Stir magnetically at 48°C for 14 minutes to obtain a titanate ester hydrated solution. Step 3: First, add the worm graphite and chopped graphite fibers weighed in Step 1 to the titanate hydrate solution obtained in Step 2. Perform high-speed shearing at 2200 r / min for 10 min-20 min to disperse the worm graphite and chopped graphite fibers in the titanate hydrate solution to obtain a mixed slurry. Finally, spread the mixed slurry to a thickness of less than 3 mm and vacuum extract it at 105℃ for 1 h to obtain conductive material powder. Step 4: The EVA, MAH, initiator, and plasticizer weighed in Step 1 and the conductive material powder obtained in Step 3 are mixed in an internal mixer at a mixing temperature of 185℃, a speed of 60r / min, and a time of 1.1h to obtain a solid material. Step 5: The solid material obtained in Step 4 is rolled into shape on an open mill. The temperature of the upper and lower rollers is 125℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.2 mm. A high-density conductive film is obtained.

[0030] Example 6 The present invention discloses a method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, which is specifically implemented according to the following steps: Step 1: Weigh out worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator, and plasticizer, respectively. The titanate is either triisostearoyl titanate or tris(dioctylpyrophosphoryloxy) titanate isopropyl; the initiator is bis(tert-butylperoxide)diisopropylbenzene (BIBP); and the plasticizer is dibutyl phthalate. The mass ratio of worm graphite to chopped graphite fiber to titanate to deionized water is: ethylene-vinyl acetate copolymer (EVA): maleic anhydride (MAH): initiator: plasticizer = 11:17:2:200:100:12:1:10. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix. Stir magnetically at 42°C for 11 min to obtain a titanate ester hydrated solution. Step 3: First, add the worm graphite and chopped graphite fibers weighed in Step 1 to the titanate hydrate solution obtained in Step 2. Perform high-speed shearing at 2400 r / min for 19 min to disperse the worm graphite and chopped graphite fibers in the titanate hydrate solution to obtain a mixed slurry. Finally, spread the mixed slurry to a thickness of less than 3 mm and vacuum extract it at 115℃ for 3 h to obtain conductive material powder. Step 4: The EVA, MAH, initiator, and plasticizer weighed in Step 1 and the conductive material powder obtained in Step 3 are mixed in an internal mixer at a mixing temperature of 195℃, a speed of 60r / min, and a time of 1.4h to obtain a solid material. Step 5: The solid material obtained in Step 4 is rolled into shape on an open mill. The temperature of the upper and lower rollers is 125℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.4 mm. A high-density conductive film is obtained.

[0031] The foregoing description illustrates and describes several preferred embodiments of the invention. However, as previously stated, it should be understood that the invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the invention should be within the protection scope of the appended claims.

Claims

1. A high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, characterized in that, It contains worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator and plasticizer; the mass ratio of worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator and plasticizer is: 10-15: 45-55: 1-2: 200: 100: 10-15: 1-1.5: 10-15.

2. A method for preparing a high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film, characterized in that, The product is prepared by mixing, dehydrating, internal mixing and rolling molding, using worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator and plasticizer as raw materials in a mass ratio of 10-15:45-55:1-2:200:100:10-15:1-1.5:10-15.

3. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 2, characterized in that, The specific steps are as follows: Step 1: Weigh out the following components according to the mass ratio of 10-15: 45-55: 1-2: 200: 100: 10-15: 1-1.5: 10-15: respectively: worm graphite, chopped graphite fiber, titanate, deionized water, ethylene-vinyl acetate copolymer (EVA), maleic anhydride (MAH), initiator and plasticizer. Step 2: Add the titanate ester weighed in Step 1 to deionized water and mix to obtain a titanate ester hydrated solution; Step 3: The worm graphite and chopped graphite fibers weighed in Step 1 are added to the titanate hydrate solution obtained in Step 2 in sequence, and high-speed shearing is performed to obtain a mixed slurry. Finally, the mixed slurry is dried and dehydrated until conductive material powder is obtained. Step 4: Mix the EVA, MAH, initiator, and plasticizer weighed in Step 1 with the conductive material powder obtained in Step 3 in an internal mixer to obtain a solid material. Step 5: Roll the solid material obtained in Step 4 into a two-roll mill to obtain a high-density conductive film.

4. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 3, characterized in that, In step 1, the worm graphite has a particle size of 100-200 mesh, and the chopped graphite fibers have a length of no more than 100µm and a particle size of 2µm-5µm.

5. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 4, characterized in that, In step 1, the titanate is triisostearoyl titanate isopropyl or tris(dioctylpyrophosphoryloxy) titanate isopropyl.

6. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 5, characterized in that, In step 1, the initiator is bis-tert-butyl peroxide diisopropylbenzene (BIBP); the plasticizer is dibutyl phthalate.

7. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 6, characterized in that, In step 2, the preparation process of the titanate hydrate solution is as follows: first, weigh titanate and deionized water according to a mass ratio of 0.5-1:100, then mix the two and stir magnetically at 40℃-50℃ for 10min-15min to obtain the titanate hydrate solution.

8. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 7, characterized in that, In step 3, the dehydration process is as follows: the mixed slurry is spread to a thickness of less than 3 mm and vacuum-extracted at 100 ℃ - 120 ℃ for 1 h - 3 h.

9. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 8, characterized in that, In step 4, the mixing temperature is 180 ℃ - 200 ℃, the rotation speed is 60 r / min, and the time is 1 h - 1.5 h.

10. The method for preparing the high-toughness, temperature-resistant, and acid-corrosion-resistant conductive film according to claim 9, characterized in that, In step 5, the open mill rolling process is as follows: the temperature of the upper and lower rollers is 120 ℃ - 150 ℃, the linear speed is 1 m / min, and the distance between the upper and lower rollers is 0.1 mm - 0.5 mm.

Images