Anti-corrosion and anti-cracking submarine cable sheath material and preparation method thereof

Abstract

The invention relates to the technical field of cable sheath materials, in particular to a corrosion-resistant and cracking-resistant submarine cable sheath material and a preparation method thereof. The corrosion-resistant and cracking-resistant submarine cable sheath material is prepared from the following raw materials in parts by weight: 60-80 parts of polyurethane rubber, 40-60 parts of butadiene styrene rubber, 20-30 parts of high-density polyethylene, 20-30 parts of filler, 10-15 parts of diatomite, 2-4 parts of calcium carbonate, 1-2 parts of antioxidant and 1-2 parts of lubricant. In N, N-dimethylformamide, a sulfonic acid group of 2-acrylamide-2-methylpropanesulfonic acid and a porous structure of the chestnut shell are subjected to reaction grafting, the porous structure is utilized for reaction grafting to enhance the deformation resistance of the material, bone glue and soybean meal can be combined to form a viscous network, the coating effect on other component materials is achieved, interface defects are reduced, and the tensile strength of the material is improved. The corrosion resistance of the material is improved, so that the service life of the cable sheath material is prolonged.

Description

Technical Field

[0001] This invention relates to the field of cable sheath materials technology, specifically to a corrosion-resistant and crack-resistant submarine cable sheath material and its preparation method. Background Technology

[0002] Cable sheath material is the material that covers the outermost layer of a cable to provide protection. It has properties such as insulation, wear resistance, corrosion resistance, and weather resistance, and can adapt to harsh environments, so it is widely used.

[0003] In existing technologies, submarine cable sheath materials are used in the seabed environment for extended periods, and their surfaces are in prolonged contact with corrosive seawater, which easily leads to corrosion, damage, and cracking of the sheath material, affecting its service life. Therefore, this invention provides a corrosion-resistant and crack-resistant submarine cable sheath material and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a corrosion-resistant and crack-resistant submarine cable sheath material and its preparation method. The cable sheath material prepared by this invention not only has good corrosion resistance but also excellent wear resistance, effectively improving the performance of the cable sheath material.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a corrosion-resistant and crack-resistant submarine cable sheath material, comprising the following raw materials in parts by weight: 60-80 parts polyurethane rubber, 40-60 parts styrene-butadiene rubber, 20-30 parts high-density polyethylene, 20-30 parts filler, 10-15 parts diatomaceous earth, 2-4 parts calcium carbonate, 1-2 parts antioxidant, and 1-2 parts lubricant.

[0007] The filler is prepared by the following method:

[0008] S1: Preparation of base material, wherein the raw materials of the base material include chestnut shell, 2-acrylamide-2-methylpropanesulfonic acid, and N,N-dimethylformamide;

[0009] S2: Preparation of additives, wherein the raw materials for the additives include bone glue, soybean meal powder, water, polytetrafluoroethylene, anhydrous ethanol, and KH550;

[0010] S3: Mixing treatment, the base material and additives are mixed to obtain the filler.

[0011] Further, the method for preparing the base material is as follows: chestnut shells are selected as the raw material. After pretreatment, the chestnut shells are used to obtain powder. The powder and sodium hydroxide aqueous solution are added to a reaction vessel. The reaction vessel is set at a temperature of 60-70°C and a stirring speed of 200-300 r / min. The mixture is stirred at a constant temperature for 20-30 min. The resulting product is filtered and washed, and then sent to an oven. The oven is set at 50-60°C and dried for 3-5 h to obtain coarse material. The coarse material is added to a water bath. 2-Acrylamide-2-methylpropanesulfonic acid and N,N-dimethylformamide are added to the water bath. The water bath is set at a temperature of 75-85°C. A magnetic stirrer is connected to the water bath. The magnetic stirrer is set at a speed of 80-100 r / min and stirred at a constant temperature for 10-15 min. The resulting product is rinsed with deionized water and then sent to an oven. The oven is set at 50-60°C and dried for 2-3 h to obtain the base material.

[0012] Furthermore, the mass concentration of the sodium hydroxide aqueous solution is 2-4%, the mass of the sodium hydroxide aqueous solution is 4-6 times the mass of the powder, and the mass ratio of the coarse material, 2-acrylamide-2-methylpropanesulfonic acid, and N,N-dimethylformamide is 1:(0.08-0.1):(0.2-0.3).

[0013] Further, the pretreatment method for chestnut shells is as follows: chestnut shells are soaked in clean water for 2-4 hours, then rinsed, and after rinsing, they are placed in an oven and dried at 50-60℃ for 4-6 hours. The resulting product is then ground to a particle size of 20-40μm. The ground product is then added to a muffle furnace, where the heating rate is set to 3-5℃ / min, and the temperature is raised to 180-200℃. Then, the heating rate is set to 1-3℃ / min, and the temperature is raised to 320-340℃. The temperature is maintained for 40-50 minutes to complete the pretreatment of chestnut shells and obtain powder.

[0014] Further, the method for preparing the additive is as follows: bone glue, soybean meal powder, and water are added to a mixer, the mixer is set to 400-600 r / min and stirred for 20-30 min to obtain a slurry, the slurry is added to a reaction vessel, polytetrafluoroethylene, anhydrous ethanol, and KH550 are added to the reaction vessel, the reaction vessel is set to a temperature of 60-70℃, the stirring speed is 200-300 r / min, and the mixture is stirred at a constant temperature for 10-20 min to obtain the additive.

[0015] Furthermore, the mass ratio of bone glue, soybean meal powder, and water is 1:(0.4-0.6):(2-4), and the mass ratio of slurry, polytetrafluoroethylene, anhydrous ethanol, and KH550 is 1:(0.1-0.2):(0.3-0.4):(0.06-0.08). The polytetrafluoroethylene is selected as powder with a particle size of 10-20 μm.

[0016] Furthermore, the mass of the additive is 30-40% of the mass of the base material.

[0017] Further, the mixing process is as follows: the base material and the additive are added to a mixer, the mixer is set to 200-300 r / min and stirred for 40-60 min, then aluminum silicate fiber and silicon powder are added to the mixer, the mixer is set to 400-500 r / min and stirred for 20-30 min to complete the mixing process and obtain the filler. The mass of aluminum silicate fiber is 10-15% of the mass of the additive, the mass of silicon powder is 15-20% of the mass of the additive, the length of aluminum silicate fiber is 1-4 mm, and the particle size of silicon powder is 20-40 μm.

[0018] Furthermore, the antioxidant is selected from antioxidant 168, and the lubricant is selected from glyceryl stearate.

[0019] Secondly, the present invention also provides a method for preparing a corrosion-resistant and crack-resistant submarine cable sheath material, comprising the following steps: weighing polyurethane rubber, styrene-butadiene rubber, high-density polyethylene, filler, diatomaceous earth, calcium carbonate, antioxidant, and lubricant as needed and adding them to a mixer, setting the temperature of the mixer to 120-130°C, mixing for 10-20 minutes, adding the resulting product to a twin-screw extruder, and melt-extruded and granulated at 180-220°C to obtain the cable sheath material.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, chestnut shells, after being processed into powder, form a porous structure with a high specific surface area, enhancing their adhesion and bonding performance with other materials. In N,N-dimethylformamide, the sulfonic acid groups of 2-acrylamido-2-methylpropanesulfonic acid react and graft with the porous structure of chestnut shells, thereby enhancing the material's resistance to deformation. Bone glue and soybean meal can be combined to form an adhesive network, which can coat other component materials, reduce interface defects, and improve the material's corrosion resistance, thereby extending the service life of the cable sheath material.

[0022] 2. In this invention, by synergistically adding aluminum silicate fiber and silicon powder, the fiber provides high toughness support, preventing cracks from forming when the material is under stress, while the silicon powder can fill the pores, providing rigid support, increasing the density of the material, reducing the penetration channels of corrosive media, and improving the surface wear resistance of the material. Attached Figure Description

[0023] Figure 1 The flowchart illustrates a corrosion-resistant and crack-resistant submarine cable sheath material and its preparation method. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0026] Example 1:

[0027] Raw material selection: 60 parts polyurethane rubber, 40 parts styrene-butadiene rubber, 20 parts high-density polyethylene, 20 parts filler, 10 parts diatomaceous earth, 2 parts calcium carbonate, 1 part antioxidant, 1 part lubricant;

[0028] Packing material preparation:

[0029] S1: Base material preparation, the raw materials of the base material include chestnut shell, 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethylformamide;

[0030] The method for preparing the base material is as follows: Chestnut shells are selected as the raw material. After pretreatment, the chestnut shells are powdered. The powder and sodium hydroxide aqueous solution are added to a reaction vessel. The reaction vessel is set to a temperature of 60℃ and a stirring speed of 200 r / min. The mixture is stirred at a constant temperature for 20 min. The resulting product is filtered and washed, and then sent to an oven. The oven is set to a temperature of 50℃ for drying for 3 h to obtain a coarse material. The coarse material is added to a water bath. 2-Acrylamido-2-methylpropanesulfonic acid and N,N-dimethylformamide are added to the water bath. The water bath is set to a temperature of 75℃ and connected to a magnetic stirrer. The magnetic stirrer is set to a speed of 80 r / min. The mixture is stirred at a constant temperature for 10 min. The resulting product is rinsed with deionized water and then sent to an oven. The oven is set to a temperature of 50℃ for drying for 3 h to obtain a coarse material. The base material was prepared by drying at 50℃ for 2 hours. The mass concentration of sodium hydroxide aqueous solution was 2%, and the mass of sodium hydroxide aqueous solution was 4 times the mass of powder. The mass ratio of coarse material, 2-acrylamide-2-methylpropanesulfonic acid, and N,N-dimethylformamide was 1:0.08:0.2. The pretreatment method of chestnut shells was as follows: chestnut shells were soaked in clean water for 2 hours, then rinsed, and then sent to an oven and dried at 50℃ for 4 hours. The resulting product was ground to a particle size of 20μm. The ground product was added to a muffle furnace, and the muffle furnace was heated at a rate of 3℃ / min to 180℃. Then the heating rate was set to 1℃ / min to 320℃ and held for 40 minutes to complete the pretreatment of chestnut shells and obtain powder.

[0031] S2: Preparation of additives, the raw materials of which include bone glue, soybean meal powder, water, polytetrafluoroethylene, anhydrous ethanol, and KH550;

[0032] The method for preparing the additive is as follows: bone glue, soybean meal powder, and water are added to a mixer, which is set to 400 r / min and stirred for 20 min to obtain a slurry. The slurry is then added to a reaction vessel, where polytetrafluoroethylene (PTFE), anhydrous ethanol, and KH550 are added. The reaction vessel is set to a temperature of 60℃, and the stirring speed is 200 r / min. The mixture is stirred at this constant temperature for 10 min to obtain the additive. The mass ratio of bone glue, soybean meal powder, and water is 1:0.4:2, and the mass ratio of the slurry, PTFE, anhydrous ethanol, and KH550 is 1:0.1:0.3:0.06. The PTFE is selected as powder with a particle size of 10 μm, and the mass of the additive is 30% of the mass of the base material.

[0033] S3: Mixing treatment, the base material and additives are mixed to obtain the filler;

[0034] The mixing process is as follows: the base material and additives are added to a mixer, which is set to 200 r / min and stirred for 40 min. Then, aluminum silicate fiber and silicon powder are added to the mixer, which is set to 400 r / min and stirred for 20 min to complete the mixing process and obtain the filler. The mass of aluminum silicate fiber is 10% of the mass of the additives, the mass of silicon powder is 15% of the mass of the additives, the length of aluminum silicate fiber is 1 mm, and the particle size of silicon powder is 20 μm.

[0035] Antioxidant 168 was selected as the antioxidant, and glyceryl stearate was selected as the lubricant.

[0036] Cable sheath material preparation: Weigh polyurethane rubber, styrene-butadiene rubber, high-density polyethylene, filler, diatomaceous earth, calcium carbonate, antioxidant, and lubricant as needed and add them to a mixer. Set the mixer temperature to 120℃ and mix for 10 minutes. Add the resulting product to a twin-screw extruder and melt-extrude and granulate at 180℃ to obtain the cable sheath material.

[0037] Example 2:

[0038] Raw material selection: 70 parts polyurethane rubber, 50 parts styrene-butadiene rubber, 25 parts high-density polyethylene, 25 parts filler, 12 parts diatomaceous earth, 3 parts calcium carbonate, 1.5 parts antioxidant, 1.5 parts lubricant;

[0039] Packing material preparation:

[0040] S1: Base material preparation, the raw materials of the base material include chestnut shell, 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethylformamide;

[0041] The method for preparing the base material is as follows: Chestnut shells are selected as the raw material. After pretreatment, the chestnut shells are powdered. The powder and sodium hydroxide aqueous solution are added to a reaction vessel. The reaction vessel is set at a temperature of 65℃ and a stirring speed of 250 r / min. The mixture is stirred at a constant temperature for 25 min. The resulting product is filtered and washed, and then placed in an oven at 55℃ for drying for 4 h to obtain a coarse material. The coarse material is added to a water bath, where 2-acrylamido-2-methylpropanesulfonic acid and N,N-dimethylformamide are added. The water bath is set at a temperature of 80℃ and connected to a magnetic stirrer. The magnetic stirrer is set at a speed of 90 r / min and stirred at a constant temperature for 12 min. The resulting product is rinsed with deionized water and then placed in an oven at 55℃. The base material was prepared by drying at ℃ for 2.5h. The mass concentration of sodium hydroxide aqueous solution was 3%, and the mass of sodium hydroxide aqueous solution was 5 times the mass of powder. The mass ratio of coarse material, 2-acrylamide-2-methylpropanesulfonic acid, and N,N-dimethylformamide was 1:0.09:0.25. The pretreatment method of chestnut shells was as follows: chestnut shells were soaked in clean water for 3h, then rinsed, and then sent to an oven and dried at 55℃ for 5h. The resulting product was ground to a particle size of 30μm. The ground product was added to a muffle furnace, and the muffle furnace was heated at a rate of 4℃ / min to 190℃. Then the heating rate was set to 2℃ / min to 330℃ and held for 45min to complete the pretreatment of chestnut shells and obtain powder.

[0042] S2: Preparation of additives, the raw materials of which include bone glue, soybean meal powder, water, polytetrafluoroethylene, anhydrous ethanol, and KH550;

[0043] The method for preparing the additive is as follows: bone glue, soybean meal powder, and water are added to a mixer, which is set to 500 r / min and stirred for 25 min to obtain a slurry. The slurry is then added to a reaction vessel, where polytetrafluoroethylene (PTFE), anhydrous ethanol, and KH550 are added. The reaction vessel is set to a temperature of 65℃, and the stirring speed is 250 r / min. The mixture is stirred at this constant temperature for 15 min to obtain the additive. The mass ratio of bone glue, soybean meal powder, and water is 1:0.5:3, and the mass ratio of the slurry, PTFE, anhydrous ethanol, and KH550 is 1:0.15:0.35:0.07. The PTFE is selected as powder with a particle size of 15 μm, and the mass of the additive is 35% of the mass of the base material.

[0044] S3: Mixing treatment, the base material and additives are mixed to obtain the filler;

[0045] The mixing process is as follows: the base material and additives are added to a mixer, which is set to 250 r / min and stirred for 50 min. Then, aluminum silicate fiber and silicon powder are added to the mixer, which is set to 450 r / min and stirred for 25 min to complete the mixing process and obtain the filler. The mass of aluminum silicate fiber is 12% of the mass of the additives, the mass of silicon powder is 17% of the mass of the additives, the length of the aluminum silicate fiber is 2 mm, and the particle size of the silicon powder is 30 μm.

[0046] Antioxidant 168 was selected as the antioxidant, and glyceryl stearate was selected as the lubricant.

[0047] Cable sheath material preparation: Weigh polyurethane rubber, styrene-butadiene rubber, high-density polyethylene, filler, diatomaceous earth, calcium carbonate, antioxidant, and lubricant as needed and add them to a mixer. Set the mixer temperature to 125℃ and mix for 15 minutes. Add the resulting product to a twin-screw extruder and melt-extrude and granulate at 200℃ to obtain the cable sheath material.

[0048] Example 3:

[0049] Raw material selection: 80 parts polyurethane rubber, 60 parts styrene-butadiene rubber, 30 parts high-density polyethylene, 30 parts filler, 15 parts diatomaceous earth, 4 parts calcium carbonate, 2 parts antioxidant, 2 parts lubricant;

[0050] Packing material preparation:

[0051] S1: Base material preparation, the raw materials of the base material include chestnut shell, 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethylformamide;

[0052] The method for preparing the base material is as follows: Chestnut shells are selected as the raw material. After pretreatment, the chestnut shells are powdered. The powder and sodium hydroxide aqueous solution are added to a reaction vessel. The reaction vessel is set to a temperature of 70℃ and a stirring speed of 300 r / min. The mixture is stirred at a constant temperature for 30 min. The resulting product is filtered and washed, and then sent to an oven. The oven is set to 60℃ for drying for 5 h to obtain a coarse material. The coarse material is added to a water bath. 2-Acrylamido-2-methylpropanesulfonic acid and N,N-dimethylformamide are added to the water bath. The water bath is set to a temperature of 85℃ and connected to a magnetic stirrer. The magnetic stirrer is set to a speed of 100 r / min. The mixture is stirred at a constant temperature for 15 min. The resulting product is rinsed with deionized water and then sent to an oven. The base material was prepared by drying at 60℃ for 3 hours. The mass concentration of the sodium hydroxide aqueous solution was 4%, and the mass of the sodium hydroxide aqueous solution was 6 times the mass of the powder. The mass ratio of coarse material, 2-acrylamide-2-methylpropanesulfonic acid, and N,N-dimethylformamide was 1:0.1:0.3. The pretreatment method of chestnut shells was as follows: chestnut shells were soaked in clean water for 4 hours, then rinsed, and then placed in an oven and dried at 60℃ for 6 hours. The resulting product was then ground to a particle size of 40μm. The ground product was then added to a muffle furnace, and the muffle furnace was heated at a rate of 5℃ / min to 200℃. Then the heating rate was set to 3℃ / min to 340℃, and the temperature was held for 50 minutes to complete the pretreatment of chestnut shells and obtain powder.

[0053] S2: Preparation of additives, the raw materials of which include bone glue, soybean meal powder, water, polytetrafluoroethylene, anhydrous ethanol, and KH550;

[0054] The method for preparing the additive is as follows: bone glue, soybean meal powder, and water are added to a mixer, which is set to 600 r / min and stirred for 30 min to obtain a slurry. The slurry is then added to a reaction vessel, where polytetrafluoroethylene (PTFE), anhydrous ethanol, and KH550 are added. The reaction vessel is set to a temperature of 70℃, and the stirring speed is 300 r / min. The mixture is stirred at this constant temperature for 20 min to obtain the additive. The mass ratio of bone glue, soybean meal powder, and water is 1:0.6:4, and the mass ratio of the slurry, PTFE, anhydrous ethanol, and KH550 is 1:0.2:0.4:0.08. The PTFE is selected as powder with a particle size of 20 μm, and the mass of the additive is 40% of the mass of the base material.

[0055] S3: Mixing treatment, the base material and additives are mixed to obtain the filler;

[0056] The mixing process is as follows: the base material and additives are added to a mixer, which is set to 300 r / min and stirred for 60 min. Then, aluminum silicate fiber and silicon powder are added to the mixer, which is set to 500 r / min and stirred for 30 min to complete the mixing process and obtain the filler. The mass of aluminum silicate fiber is 15% of the mass of the additives, the mass of silicon powder is 20% of the mass of the additives, the length of the aluminum silicate fiber is 4 mm, and the particle size of the silicon powder is 40 μm.

[0057] Antioxidant 168 was selected as the antioxidant, and glyceryl stearate was selected as the lubricant.

[0058] Cable sheath material preparation: Weigh polyurethane rubber, styrene-butadiene rubber, high-density polyethylene, filler, diatomaceous earth, calcium carbonate, antioxidant, and lubricant as needed and add them to a mixer. Set the mixer temperature to 130℃ and mix for 20 minutes. Add the resulting product to a twin-screw extruder and melt-extrude and granulate at 220℃ to obtain the cable sheath material.

[0059] Comparative Example 1: The difference between this comparative example and Example 1 is that an equal amount of bamboo powder is used to replace the powder in this comparative example.

[0060] Comparative Example 2: The difference between this comparative example and Example 1 is that an equal amount of calcium stearate is used to replace the filler in this comparative example.

[0061] Comparative Example 3 differs from Example 1 in that it does not contain any additives.

[0062] Comparative Example 4 differs from Example 1 in that it does not contain filler.

[0063] Performance testing: The cable sheath materials prepared in Examples 1, 2, 3, 1, 2, 3, and 4 were subjected to performance tests, and the test data are recorded in the table below:

[0064] Table 1 Corrosion Resistance Test Table:

[0065]

[0066] Table 2 Abrasion Resistance Test Table:

[0067]

[0068] In the performance test, the cable sheath materials prepared in Examples 1, 2, 3, 1, 2, 3 and 4 were made into samples. The tensile strength and elongation at break of each sample were tested using the test method in GB / T 528-2009. After that, each sample was immersed in 1M hydrochloric acid solution for 12 days for corrosion treatment. After the corrosion treatment, the tensile strength and elongation at break were tested again.

[0069] The wear resistance of each sample was tested using the test methods in GB / T1689-1998.

[0070] It is evident that the corrosion resistance and wear resistance of the cable sheath materials prepared in Comparative Examples 1, 2, 3, and 4 are all lower than those in Examples 1, 2, and 3. This indicates that, in the filler additives, chestnut shells, after being processed into powder, form a porous structure with a high specific surface area, enhancing the adhesion and bonding performance with other materials. In N,N-dimethylformamide, the sulfonic acid groups of 2-acrylamido-2-methylpropanesulfonic acid react and graft with the porous structure of chestnut shells, utilizing the porous structure to enhance the material's resistance to deformation. Bone glue and soybean meal can combine to form an adhesive network, which can coat other component materials, reduce interface defects, and improve the material's corrosion resistance.

[0071] By synergistically adding aluminum silicate fiber and silica powder, the fiber provides high toughness support, preventing cracks from forming when the material is under stress, while the silica powder fills the pores, providing rigid support, increasing the density of the material, reducing the penetration channels of corrosive media, and improving the surface wear resistance of the material.

[0072] By comparing and analyzing the relevant data in the table, it can be seen that the cable sheath material prepared by this invention not only has good corrosion resistance but also excellent wear resistance. This indicates that the corrosion-resistant and crack-resistant submarine cable sheath material provided by this invention has a broader market prospect and is more suitable for widespread application.

[0073] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A corrosion-resistant and crack-resistant submarine cable sheath material, characterized in that: It includes the following raw materials in parts by weight: 60-80 parts polyurethane rubber, 40-60 parts styrene-butadiene rubber, 20-30 parts high-density polyethylene, 20-30 parts filler, 10-15 parts diatomaceous earth, 2-4 parts calcium carbonate, 1-2 parts antioxidant, and 1-2 parts lubricant. The filler is prepared by the following method: S1: Preparation of base material, wherein the raw materials of the base material include chestnut shell, 2-acrylamide-2-methylpropanesulfonic acid, and N,N-dimethylformamide; S2: Preparation of additives, wherein the raw materials for the additives include bone glue, soybean meal powder, water, polytetrafluoroethylene, anhydrous ethanol, and KH550; S3: Mixing treatment, the base material and additives are mixed to obtain the filler.

2. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 1, characterized in that, The method for preparing the base material is as follows: chestnut shells are selected as the raw material. After pretreatment, the chestnut shells are powdered. The powder and sodium hydroxide aqueous solution are added to a reaction vessel. The reaction vessel is set at a temperature of 60-70℃ and a stirring speed of 200-300 r / min. The mixture is stirred at a constant temperature for 20-30 min. The resulting product is filtered and washed, and then sent to an oven. The oven is set at 50-60℃ and dried for 3-5 h to obtain a coarse material. The coarse material is added to a water bath. 2-Acrylamide-2-methylpropanesulfonic acid and N,N-dimethylformamide are added to the water bath. The water bath is set at a temperature of 75-85℃. A magnetic stirrer is connected to the water bath. The magnetic stirrer is set at a speed of 80-100 r / min and stirred at a constant temperature for 10-15 min. The resulting product is rinsed with deionized water and then sent to an oven. The oven is set at 50-60℃ and dried for 2-3 h to obtain the base material.

3. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 2, characterized in that, The mass concentration of the sodium hydroxide aqueous solution is 2-4%, and the mass of the sodium hydroxide aqueous solution is 4-6 times the mass of the powder. The mass ratio of the coarse material, 2-acrylamide-2-methylpropanesulfonic acid, and N,N-dimethylformamide is 1:(0.08-0.1):(0.2-0.3).

4. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 1, characterized in that, The pretreatment method for chestnut shells is as follows: chestnut shells are soaked in clean water for 2-4 hours, then rinsed, and then placed in an oven at 50-60℃ for 4-6 hours. The resulting product is then ground to a particle size of 20-40 μm. The ground product is then added to a muffle furnace, where the heating rate is set to 3-5℃ / min, and the temperature is raised to 180-200℃. The heating rate is then set to 1-3℃ / min, and the temperature is raised to 320-340℃. The temperature is maintained for 40-50 minutes to complete the pretreatment of chestnut shells and obtain powder.

5. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 1, characterized in that, The method for preparing the additive is as follows: bone glue, soybean meal powder, and water are added to a mixer, which is set to 400-600 r / min and stirred for 20-30 min to obtain a slurry. The slurry is then added to a reaction vessel, where polytetrafluoroethylene, anhydrous ethanol, and KH550 are added. The reaction vessel is set to a temperature of 60-70℃ and a stirring speed of 200-300 r / min. The mixture is stirred at a constant temperature for 10-20 min to obtain the additive.

6. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 5, characterized in that, The mass ratio of bone glue, soybean meal powder, and water is 1:(0.4-0.6):(2-4), and the mass ratio of slurry, polytetrafluoroethylene, anhydrous ethanol, and KH550 is 1:(0.1-0.2):(0.3-0.4):(0.06-0.08). The polytetrafluoroethylene is selected as powder with a particle size of 10-20 μm.

7. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 1, characterized in that, The mass of the additive is 30-40% of the mass of the base material.

8. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 1, characterized in that, The mixing process is as follows: the base material and additives are added to a mixer, which is set to 200-300 r / min and stirred for 40-60 min. Then, aluminum silicate fiber and silicon powder are added to the mixer, which is set to 400-500 r / min and stirred for 20-30 min to complete the mixing process and obtain the filler. The mass of aluminum silicate fiber is 10-15% of the mass of the additives, the mass of silicon powder is 15-20% of the mass of the additives, the length of the aluminum silicate fiber is 1-4 mm, and the particle size of the silicon powder is 20-40 μm.

9. The corrosion-resistant and crack-resistant submarine cable sheath material according to claim 1, characterized in that, The antioxidant is selected from antioxidant 168, and the lubricant is selected from glyceryl stearate.

10. A method for preparing a corrosion-resistant and crack-resistant submarine cable sheath material according to any one of claims 1-9, characterized in that, The process includes the following steps: Weigh polyurethane rubber, styrene-butadiene rubber, high-density polyethylene, filler, diatomaceous earth, calcium carbonate, antioxidant, and lubricant as needed and add them to a mixer. Set the mixer temperature to 120-130℃ and mix for 10-20 minutes. Add the resulting product to a twin-screw extruder and melt-extrude and granulate it at 180-220℃ to obtain cable sheath material.

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