Pressure-resistant rubber pipe and preparation method thereof

Abstract

The invention relates to the technical field of rubber materials, and provides a pressure-resistant rubber tube and a preparation method thereof. The pressure-resistant rubber tube sequentially comprises an inner rubber layer, a middle rubber layer, a steel wire reinforcing layer and an outer rubber layer from inside to outside, the inner rubber layer is prepared from, by weight, 100 parts of nitrile rubber, 70-80 parts of filler, 10-12 parts of plasticizer, 3-4 parts of calcium stearate, 1-3 parts of vulcanizing agent and 1-2 parts of accelerant, and the nitrile rubber is composed of first nitrile rubber and second nitrile rubber; the first nitrile rubber and the second nitrile rubber have different acrylonitrile contents. By means of the technical scheme, the problem that in the prior art, the pressure resistance of a rubber pipe is insufficient is solved.

Description

Technical Field

[0001] This invention relates to the field of rubber materials technology, specifically to a pressure-resistant rubber hose and its preparation method. Background Technology

[0002] Hydraulic hoses are made of rubber as the base material and reinforced with reinforcing skeleton materials. Their core function is to safely transport fluid media under specific pressure conditions. With their good flexibility, impact resistance and sealing performance, they are widely used in many fields such as mine hydraulic supports, oil field extraction, engineering machinery, and aerospace. Among them, mine hydraulic supports and oil field extraction are their most representative core application scenarios.

[0003] In mining operations, pressure-resistant hoses serve as the power transmission hub for hydraulic supports, responsible for conveying high-pressure hydraulic oil or emulsion to drive the supports in lifting, lowering, and moving, directly determining the support stability and operational safety. In oilfield extraction scenarios, they are responsible for tasks such as high-pressure crude oil transportation, drilling fluid circulation, and hydraulic drive of oil production equipment, making them a key component to ensure continuous and efficient extraction operations. These application scenarios place stringent requirements on the pressure resistance of pressure-resistant hoses.

[0004] However, in existing technologies, the inner rubber layer of the hose still suffers from insufficient pressure resistance. Insufficient pressure resistance can lead to a series of serious problems. At best, it can cause media leakage, resulting in a sudden drop in hydraulic system pressure, leading to production interruptions such as mine support instability and oilfield equipment shutdowns, significantly increasing equipment maintenance costs and operational delays. At worst, it can cause the hose to burst, with high-pressure media ejection potentially triggering fires, explosions, and other safety accidents, threatening the lives of on-site operators and causing environmental pollution problems such as crude oil spills, resulting in enormous economic and social losses.

[0005] Therefore, it is necessary to develop a pressure-resistant hose. Summary of the Invention

[0006] This invention proposes a pressure-resistant hose and its preparation method, which solves the problem of insufficient pressure resistance of hoses in related technologies.

[0007] The technical solution of the present invention is as follows: The present invention proposes a pressure-resistant rubber hose, which comprises, from the inside out, an inner rubber layer, a middle rubber layer, a steel wire reinforcement layer and an outer rubber layer. The inner rubber layer comprises the following raw materials in parts by weight: 100 parts of nitrile rubber, 70-80 parts of filler, 10-12 parts of plasticizer, 3-4 parts of calcium stearate, 1-3 parts of vulcanizing agent, and 1-2 parts of accelerator. The nitrile rubber is composed of a first nitrile rubber and a second nitrile rubber, and the acrylonitrile content of the first nitrile rubber and the second nitrile rubber is different.

[0008] As a further technical solution, the acrylonitrile content of the first nitrile rubber is 28wt%~29wt%, for example, it can be 28wt% or 29wt%, preferably 28wt%, and the acrylonitrile content of the second nitrile rubber is 34wt%~35wt%, for example, it can be 34wt% or 35wt%, preferably 35wt%.

[0009] In the pressure-resistant hose of the present invention, the acrylonitrile content of the first nitrile rubber is 28wt%~29wt%, and the molecular chain has weak polarity, resulting in good flowability and elasticity. The acrylonitrile content of the second nitrile rubber is 34wt%~35wt%. When the two are used together, the high polarity of the second nitrile rubber can serve as a rigid support for the crosslinking network, while the low polarity of the first nitrile rubber fills the gaps in the network, balancing the rigidity of the rubber compound and preventing cracking due to excessive brittleness under high pressure, thereby improving the pressure resistance of the hose.

[0010] As a further technical solution, the mass ratio of the first nitrile rubber to the second nitrile rubber is 3:6~7.

[0011] In the inner rubber layer of the pressure-resistant hose of the present invention, the mass ratio of the first nitrile rubber and the second nitrile rubber is 3:6~7. If the proportion of the first nitrile rubber increases, the rigidity of the cross-linking network will be insufficient. If the proportion of the first nitrile rubber decreases, the proportion of the strong polar chain segments of the second nitrile rubber will be too high, the cross-linking network will be too rigid and the elasticity will be insufficient. Under long-term pressure, the inner rubber layer is prone to cracks, which will lead to hose rupture. When the mass ratio of the first nitrile rubber and the second nitrile rubber is 3:6~7, a balance between rigidity and elasticity can be achieved, thereby improving the pressure resistance of the hose.

[0012] As a further technical solution, the plasticizer includes one or more of dioctyl phthalate, dibutyl phthalate, and dioctyl adipate.

[0013] The present invention adds a plasticizer to the pressure-resistant rubber hose. The addition of the plasticizer can reduce the intermolecular forces of nitrile rubber, making it easier to flow in processing steps such as mixing and extrusion, and reducing equipment energy consumption.

[0014] As a further technical solution, the vulcanizing agent includes one or more of sulfur, dicumyl peroxide, and benzoyl peroxide, preferably sulfur.

[0015] The present invention adds a vulcanizing agent to the pressure-resistant rubber hose. The vulcanizing agent reacts with nitrile rubber molecules to connect the linear rubber molecules into a three-dimensional network structure, causing the rubber to lose its thermoplasticity, possess stable physical properties, and extend the service life of the hose.

[0016] As a further technical solution, the accelerator includes one or more of 2-mercaptobenzothiazole, dibenzothiazole disulfide, and tetramethylthiuram disulfide, preferably 2-mercaptobenzothiazole.

[0017] The present invention adds an accelerator to the pressure-resistant rubber hose. The accelerator can improve the reaction efficiency of the vulcanizing agent, accelerate the crosslinking reaction, reduce the residence time of the rubber hose in the vulcanizing tank, improve production efficiency, and reduce costs.

[0018] As a further technical solution, the filler comprises the following raw materials in parts by weight: 40-60 parts carbon black, 15-20 parts calcium carbonate, 5-10 parts talc, 4-5 parts 3-(N-cyclohexylamine)propyltrimethoxysilane, and 1-2 parts aminodiphenyl sulfide compound.

[0019] As a further technical solution, the preparation method of the filler includes the following steps: dispersing 3-(N-cyclohexylamine)propyltrimethoxysilane in anhydrous ethanol, adding carbon black, mixing and drying to obtain composite carbon black; dispersing an aminodiphenyl sulfide compound in anhydrous ethanol, adding calcium carbonate, mixing and drying to obtain composite calcium carbonate; and mixing the composite carbon black, the composite calcium carbonate and the talc powder to obtain the filler.

[0020] In the inner rubber layer of the pressure-resistant rubber hose of the present invention, carbon black is treated with 3-(N-cyclohexylamine)propyltrimethoxysilane and calcium carbonate is compounded with an aminodiphenyl sulfide compound to promote the uniform dispersion of carbon black and calcium carbonate, improve the interfacial compatibility of carbon black, calcium carbonate and rubber, avoid the fracture problem caused by stress concentration, and improve the tensile strength of the inner rubber layer.

[0021] As a further technical solution, the mass ratio of anhydrous ethanol to carbon black is 4~6:1, for example, it can be 4:1, 5:1, 6:1, preferably 5:1.

[0022] As a further technical solution, the mixing time during the preparation of the composite carbon black is 2 to 5 hours, for example, 2 hours, 3 hours, 4 hours, or 5 hours, preferably 3 hours.

[0023] As a further technical solution, the mass ratio of anhydrous ethanol to calcium carbonate is 3 to 6:1, for example, it can be 3:1, 4:1, 5:1, or 6:1, preferably 5:1.

[0024] As a further technical solution, the mixing time during the preparation of the composite calcium carbonate is 3 to 6 hours, for example, 3 hours, 4 hours, 5 hours, or 6 hours, preferably 3 hours.

[0025] As a further technical solution, the aminodiphenyl sulfide compound includes one or more of 2-aminodiphenyl sulfide, 4,4-diaminodiphenyl sulfide, and 2-amino-4'-chlorodiphenyl sulfide.

[0026] As a further technical solution, the intermediate rubber layer comprises the following raw materials in parts by weight: 100 parts of second nitrile rubber, 30-50 parts of carbon black, 10-12 parts of dioctyl phthalate, 2-4 parts of zinc oxide, 1-3 parts of antioxidant, 0.5-1 part of accelerator, and 1-3 parts of vulcanizing agent.

[0027] As a further technical solution, the antioxidant is antioxidant RD.

[0028] As a further technical solution, the accelerator is accelerator NS.

[0029] As a further technical solution, the vulcanizing agent is sulfur.

[0030] As a further technical solution, the outer rubber layer comprises the following raw materials in parts by weight: 100 parts of chloroprene rubber, 40-50 parts of ethylene-vinyl alcohol copolymer, 20-30 parts of carbon black, 20-30 parts of alumina, 3-5 parts of vulcanizing agent, 2-3 parts of antioxidant, and 0.5-1.5 parts of accelerator.

[0031] As a further technical solution, the vulcanizing agent is sulfur.

[0032] As a further technical solution, the antioxidant is antioxidant RD.

[0033] As a further technical solution, the accelerator is accelerator NS.

[0034] This invention also proposes a method for preparing a pressure-resistant hose, comprising the following steps: S1. Mix the raw materials of the inner rubber layer evenly except for the vulcanizing agent, add the vulcanizing agent, mix and then extrude to obtain the inner rubber layer material. S2. Mix the raw materials of the middle rubber layer evenly except for the vulcanizing agent, add the vulcanizing agent, mix and then extrude to obtain the middle rubber layer material. S3. Mix the raw materials of the outer rubber layer evenly except for the vulcanizing agent, add the vulcanizing agent, mix and then extrude to obtain the outer rubber layer material. S4. The inner rubber layer material is coated to obtain the inner rubber layer. The middle rubber layer material, the steel wire reinforcement layer, and the outer rubber layer material are sequentially coated on the outer surface of the inner rubber layer to obtain the pressure-resistant hose.

[0035] This invention relates to a pressure-resistant hose that possesses excellent performance in withstanding both positive and negative pressure. Its layered structural design is the core support. The inner rubber layer, formed using a specific raw material ratio and extrusion process, resists expansion and bursting under high system pressure, ensuring structural stability under positive pressure. The synergistic coating of the middle rubber layer, steel wire reinforcement layer, and outer rubber layer, especially the braided reinforcement of the steel wire reinforcement layer, gives the hose excellent compression resistance. When the system experiences negative pressure, it can effectively resist the compression of external atmospheric pressure, preventing pipeline collapse and blockage. This optimization of the process and strengthening of the structure from the inside out allows the hose to cope with the internal high pressure during hydraulic system operation and adapt to the internal low pressure during fluid return or oil replenishment, meeting the dual pressure resistance requirements under complex working conditions.

[0036] The working principle and beneficial effects of this invention are as follows: In the pressure-resistant hose of this invention, the inner rubber layer is composed of a first nitrile rubber and a second nitrile rubber with different acrylonitrile contents. The two are used in combination to improve the hose's pressure resistance. The nitrile rubber with lower acrylonitrile content has lower molecular chain polarity, giving the rubber good elasticity and processing fluidity. The nitrile rubber with higher acrylonitrile content has higher molecular chain polarity, possessing stronger intermolecular forces and media stability. The combination of the two allows the molecular chains of different polarities to form a more uniform cross-linked network. The low-polarity chain segments enhance the flexibility of the cross-linked network, preventing brittleness due to excessive rigidity under high pressure; the high-polarity chain segments increase the cross-linking point density, improving the rubber's tensile and compressive strength. When the hose is subjected to high-pressure fluid impact, the inner rubber layer can effectively disperse stress, reduce local stress concentration, and improve the hose's pressure resistance. Detailed Implementation

[0037] 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.

[0038] In the following examples and comparative examples: First Nitrile Rubber: Acrylonitrile content is 28wt%, model number is 2875, purchased from JSR Corporation; Second nitrile rubber: Acrylonitrile content is 35wt%, model is N230SV, purchased from JSR Corporation; Carbon black: Model N550; Calcium carbonate: average particle size is 800 mesh; Talc powder: average particle size is 400 mesh; Ethylene-vinyl alcohol copolymer: Model number EVAL TM H171B; The steel wire in the steel wire reinforcement layer is 321 stainless steel wire.

[0039] Example 1 A method for preparing a pressure-resistant rubber hose includes the following steps: S1. Mix the raw materials of the inner rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the inner rubber layer material; S2. Mix the raw materials of the middle rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the middle rubber layer material; S3. Mix the raw materials of the outer rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the outer rubber layer material; S4. The inner rubber layer material is coated with rubber to obtain the inner rubber layer. The middle rubber layer material, the braided steel wire reinforcement layer, and the outer rubber layer material are sequentially coated on the outer surface of the inner rubber layer to obtain the pressure-resistant hose. The raw materials for the inner rubber layer include the following components by weight: 100 parts of nitrile rubber, 70 parts of filler, 10 parts of dioctyl phthalate, 3 parts of calcium stearate, 1 part of sulfur, and 1 part of 2-mercaptobenzothiazole; wherein the nitrile rubber is composed of a first nitrile rubber and a second nitrile rubber in a mass ratio of 1:2, and the filler includes the following raw materials by weight: 40 parts of carbon black, 15 parts of calcium carbonate, and 5 parts of talc. The middle layer comprises the following raw materials in parts by weight: 100 parts of second nitrile rubber, 30 parts of carbon black, 10 parts of dioctyl phthalate, 2 parts of zinc oxide, 1 part of antioxidant RD, 0.5 parts of accelerator NS, and 1 part of sulfur; The outer rubber layer comprises the following raw materials in parts by weight: 100 parts chloroprene rubber, 40 parts ethylene-vinyl alcohol copolymer, 20 parts carbon black, 20 parts alumina, 3 parts sulfur, 2 parts antioxidant RD, and 0.5 parts accelerator NS.

[0040] Example 2 A method for preparing a pressure-resistant rubber hose includes the following steps: S1. Mix the raw materials of the inner rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the inner rubber layer material; S2. Mix the raw materials of the middle rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the middle rubber layer material; S3. Mix the raw materials of the outer rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the outer rubber layer material; S4. The inner rubber layer material is coated with rubber to obtain the inner rubber layer. The middle rubber layer material, the braided steel wire reinforcement layer, and the outer rubber layer material are sequentially coated on the outer surface of the inner rubber layer to obtain the pressure-resistant hose. The raw materials for the inner rubber layer include the following components by weight: 100 parts of nitrile rubber, 75 parts of filler, 11 parts of dibutyl phthalate, 3.5 parts of calcium stearate, 2 parts of sulfur, and 1.5 parts of 2-mercaptobenzothiazole; wherein the nitrile rubber is composed of a first nitrile rubber and a second nitrile rubber in a mass ratio of 1:2, and the filler includes the following raw materials by weight: 50 parts of carbon black, 18 parts of calcium carbonate, and 8 parts of talc. The middle layer comprises the following raw materials in parts by weight: 100 parts of second nitrile rubber, 40 parts of carbon black, 11 parts of dioctyl phthalate, 3 parts of zinc oxide, 2 parts of antioxidant RD, 0.8 parts of accelerator NS, and 2 parts of sulfur; The outer rubber layer comprises the following raw materials in parts by weight: 100 parts chloroprene rubber, 45 parts ethylene-vinyl alcohol copolymer, 25 parts carbon black, 25 parts alumina, 4 parts sulfur, 2.5 parts antioxidant RD, and 1 part accelerator NS.

[0041] Example 3 A method for preparing a pressure-resistant rubber hose includes the following steps: S1. Mix the raw materials of the inner rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the inner rubber layer material; S2. Mix the raw materials of the middle rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the middle rubber layer material; S3. Mix the raw materials of the outer rubber layer evenly except for the vulcanizing agent, add sulfur, mix and then extrude to obtain the outer rubber layer material; S4. The inner rubber layer material is coated with rubber to obtain the inner rubber layer. The middle rubber layer material, the braided steel wire reinforcement layer, and the outer rubber layer material are sequentially coated on the outer surface of the inner rubber layer to obtain the pressure-resistant hose. The raw materials for the inner rubber layer include the following components by weight: 100 parts of nitrile rubber, 80 parts of filler, 12 parts of dioctyl adipate, 4 parts of calcium stearate, 3 parts of sulfur, and 2 parts of 2-mercaptobenzothiazole; wherein the nitrile rubber is composed of a first nitrile rubber and a second nitrile rubber in a mass ratio of 1:2, and the filler includes the following raw materials by weight: 60 parts of carbon black, 20 parts of calcium carbonate, and 10 parts of talc. The middle layer comprises the following raw materials in parts by weight: 100 parts of second nitrile rubber, 50 parts of carbon black, 12 parts of dioctyl phthalate, 4 parts of zinc oxide, 3 parts of antioxidant RD, 1 part of accelerator NS, and 3 parts of sulfur; The outer rubber layer comprises the following raw materials in parts by weight: 100 parts chloroprene rubber, 50 parts ethylene-vinyl alcohol copolymer, 30 parts carbon black, 30 parts alumina, 5 parts sulfur, 3 parts antioxidant RD, and 1.5 parts accelerator NS.

[0042] Example 4 The difference between Example 4 and Example 2 is that the nitrile rubber in the inner rubber layer is composed of a first nitrile rubber and a second nitrile rubber in a mass ratio of 3:7.

[0043] Example 5 Compared with Example 4, the difference in Example 5 is that, in the inner rubber layer, the first nitrile rubber (acrylonitrile content of 28wt%, model 2875, purchased from JSR Corporation) is replaced with an equal amount of nitrile rubber (acrylonitrile content of 25wt%, model N640, purchased from JSR Corporation).

[0044] Example 6 Compared with Example 4, the difference in Example 6 is that, in the inner rubber layer, the second nitrile rubber (acrylonitrile content of 35wt%, model N230SV, purchased from JSR Corporation) is replaced with an equal amount of nitrile rubber (acrylonitrile content of 48wt%, model N215SL, purchased from JSR Corporation).

[0045] Example 7 The preparation method of the filler includes the following steps: 4 parts of 3-(N-cyclohexylamine)propyltrimethoxysilane are dispersed in 250 parts of anhydrous ethanol, 50 parts of carbon black are added, and after mixing for 3 hours, the mixture is dried to obtain composite carbon black. The composite carbon black, 18 parts of calcium carbonate and 8 parts of talc are mixed to obtain the filler. The difference between Example 7 and Example 4 is that the filler is replaced with an equal amount of filler prepared by the above preparation method.

[0046] Example 8 The preparation method of the filler includes the following steps: 1 part of 2-aminodiphenyl sulfide is dispersed in 90 parts of anhydrous ethanol, 18 parts of calcium carbonate are added, and after mixing for 3 hours, the mixture is dried to obtain composite calcium carbonate. 50 parts of carbon black, composite calcium carbonate and 8 parts of talc are mixed to obtain the filler. The difference between Example 4 and Example 8 is that the filler is replaced with an equal amount of filler prepared by the above preparation method.

[0047] Example 9 The preparation method of the filler includes the following steps: 4 parts of 3-(N-cyclohexylamine)propyltrimethoxysilane are dispersed in 250 parts of anhydrous ethanol, 50 parts of carbon black are added, and the mixture is dried after 3 hours to obtain composite carbon black; 1 part of 2-aminodiphenyl sulfide is dispersed in 90 parts of anhydrous ethanol, 18 parts of calcium carbonate are added, and the mixture is dried after 3 hours to obtain composite calcium carbonate; the composite carbon black, composite calcium carbonate and 8 parts of talc are mixed to obtain the filler; The difference between Example 4 and Example 9 is that the filler is replaced with an equal amount of filler prepared by the above preparation method.

[0048] Example 10 Compared with Example 9, Example 10 differs in that the amount of 3-(N-cyclohexylamine)propyltrimethoxysilane added is 5 parts, and the amount of 2-aminodiphenyl sulfide added is 2 parts.

[0049] Example 11 The difference between Example 11 and Example 10 is that 2-aminodiphenyl sulfide is replaced with an equal amount of 4,4-diaminodiphenyl sulfide.

[0050] Example 12 The difference between Example 12 and Example 10 is that 2-aminodiphenyl sulfide is replaced with an equal amount of 2-amino-4'-chlorodiphenyl sulfide.

[0051] Comparative Example 1 Compared with Example 2, the difference in Comparative Example 1 is that the nitrile rubber in the inner layer is the first nitrile rubber.

[0052] Comparative Example 2 Compared with Example 2, the difference in Comparative Example 2 is that the nitrile rubber in the inner layer is a second nitrile rubber.

[0053] Experimental Example 1 The pressure-resistant hoses prepared in Examples 1-6 and Comparative Examples 1-2 were subjected to hydrostatic tests according to the test methods specified in GB / T 10544-2003 "Hydraulic Rubber Hoses and Hoses with Steel Wire Spiral Reinforced Rubber Coating" to obtain the minimum burst pressure. The type of the samples was a 4-layer steel wire spiral medium-pressure hose with an inner diameter of 19 mm.

[0054] The test results are shown in Table 1: Table 1. Performance test results of pressure-resistant hoses prepared in Examples 1-6 and Comparative Examples 1-2

[0055] As shown in Table 1, when the inner rubber layer of the pressure-resistant hose is composed of first nitrile rubber and second nitrile rubber with different acrylonitrile contents, the pressure resistance of the hose can be improved.

[0056] Experimental Example 2 The inner rubber layer of the pressure-resistant rubber hoses prepared in Examples 4 and 7-12 was tested for tensile strength according to the test methods specified in GB / T 528-2009 "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber". The specimens were type 1A dumbbell-shaped specimens with a thickness of 4 mm.

[0057] The test results are shown in Table 2: Table 2. Performance test results of the inner rubber layer of the pressure-resistant hoses prepared in Examples 4 and 7-12.

[0058] As shown in Table 2, when the filler in the inner rubber layer of the pressure-resistant hose includes 3-(N-cyclohexylamine)propyltrimethoxysilane and aminodiphenyl sulfide compounds, the tensile strength of the inner rubber layer of the pressure-resistant hose can be improved.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure-resistant hose characterized by, From inside to outside, the inner rubber layer, the middle rubber layer, the steel wire reinforced layer and the outer rubber layer are sequentially included, the inner rubber layer includes the following components in parts by weight: nitrile rubber 100 parts, filler 70-80 parts, plasticizer 10-12 parts, calcium stearate 3-4 parts, vulcanizing agent 1-3 parts, accelerator 1-2 parts, the nitrile rubber is composed of first nitrile rubber and second nitrile rubber, the acrylonitrile content of the first nitrile rubber and the second nitrile rubber is different.

2. The pressure-resistant rubber tube according to claim 1, wherein The acrylonitrile content of the first nitrile rubber is 28wt%-29wt%, the acrylonitrile content of the second nitrile rubber is 34wt%-35wt%.

3. The pressure-resistant rubber tube according to claim 1, wherein The mass ratio of the first nitrile rubber and the second nitrile rubber is 3:6-7.

4. The pressure-resistant rubber tube according to claim 1, wherein The plasticizer includes one or more of dioctyl phthalate, dibutyl phthalate, dioctyl adipate; The vulcanizing agent includes one or more of sulfur, dicumyl peroxide, benzoyl peroxide; The accelerator includes one or more of 2-mercaptobenzothiazole, diphenyl disulfide, tetramethylthiuram disulfide.

5. The pressure-resistant rubber tube according to claim 1, wherein The filler includes the following components in parts by weight: carbon black 40-60 parts, calcium carbonate 15-20 parts, talc 5-10 parts, 3-(N-cyclohexylamine) propyl trimethoxysilane 4-5 parts, aminodiphenyl sulfide compound 1-2 parts.

6. A pressure-resistant rubber tube according to claim 5, wherein The preparation method of the filler includes the following steps: dispersing 3-(N-cyclohexylamine) propyl trimethoxysilane in anhydrous ethanol, adding carbon black, drying after mixing to obtain composite carbon black, dispersing aminodiphenyl sulfide compound in anhydrous ethanol, adding calcium carbonate, drying after mixing to obtain composite calcium carbonate, mixing the composite carbon black, the composite calcium carbonate and the talc to obtain the filler.

7. A pressure-resistant rubber tube according to claim 5, wherein The aminodiphenyl sulfide compound includes one or more of 2-aminodiphenyl sulfide, 4,4-diamino diphenyl sulfide, 2-amino-4'-chlorodiphenyl sulfide.

8. The pressure-resistant rubber tube according to claim 1, wherein The middle rubber layer includes the following components in parts by weight: second nitrile rubber 100 parts, carbon black 30-50 parts, dioctyl phthalate 10-12 parts, zinc oxide 2-4 parts, antioxidant 1-3 parts, accelerator 0.5-1 part, vulcanizing agent 1-3 parts.

9. The pressure-resistant rubber tube according to claim 1, wherein The outer rubber layer includes the following components in parts by weight: chloroprene rubber 100 parts, ethylene-vinyl alcohol copolymer 40-50 parts, carbon black 20-30 parts, aluminum oxide 20-30 parts, vulcanizing agent 3-5 parts, antioxidant 2-3 parts, accelerator 0.5-1.5 parts.

10. A method for producing a pressure-resistant rubber tube for use in the pressure-resistant rubber tube according to any one of claims 1 to 9, characterized by, It includes the following steps: S1, uniformly mix the raw materials of the inner rubber layer except the vulcanizing agent, add the vulcanizing agent, extrude after mixing to obtain the inner rubber layer material; S2, uniformly mix the raw materials of the middle rubber layer except the vulcanizing agent, add the vulcanizing agent, extrude after mixing to obtain the middle rubber layer material; S3, uniformly mix the raw materials of the outer rubber layer except the vulcanizing agent, add the vulcanizing agent, extrude after mixing to obtain the outer rubber layer material; S4, the inner rubber layer material is coated to obtain the inner rubber layer, the middle rubber layer material is coated on the outer surface of the inner rubber layer, the steel wire reinforced layer is woven, and the outer rubber layer material is coated to obtain the pressure-resistant rubber pipe.

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