Flame-retardant high-airtight corrosion-resistant composite rubber material, preparation method and application thereof and flame-retardant high-airtight corrosion-resistant rubber tube

Abstract

The invention provides a flame-retardant high-airtightness corrosion-resistant composite rubber material, a preparation method and application thereof and a flame-retardant high-airtightness corrosion-resistant rubber tube, and relates to the technical field of rubber materials. The flame-retardant high-airtight corrosion-resistant composite rubber material comprises the following components: butyl rubber, ethylene propylene diene monomer, chloroprene rubber, epichlorohydrin rubber, fluorinated montmorillonite and nano cerium oxide. The four kinds of rubber are used together through formula design, a product can have high strength, high elasticity, low compression set and excellent damping performance at the same time, good flexibility is kept, meanwhile, the durability of the product is remarkably improved, and the service life of the product is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of rubber materials technology, and in particular to a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material, its preparation method and application, and a flame-retardant, high-airtightness, and corrosion-resistant rubber pipe. Background Technology

[0002] With the development of new energy vehicles, high-power electronic devices (such as data centers and 5G base stations), and industrial laser equipment, efficient heat dissipation has become a core requirement. Traditional air cooling methods are no longer sufficient to meet the temperature control needs of high-energy-density electronic components. Liquid cooling technology has become the mainstream solution due to its high thermal conductivity and good temperature uniformity. As a key component for transporting the cooling medium, liquid cooling hoses regulate the equipment temperature by circulating cooling media (such as water or ethylene glycol solution) to ensure its efficient and stable operation. The performance of the liquid cooling hoses directly affects the system's heat dissipation efficiency and reliability.

[0003] Furthermore, electrochemical energy storage systems (such as lithium-ion battery packs and flow batteries) and compressed air energy storage systems also rely on fluid media (such as coolants and electrolytes) for energy transfer and thermal management. These systems place higher demands on the long-term sealing performance, corrosion resistance, and fatigue resistance of the hoses.

[0004] However, existing liquid-cooled hoses and energy storage hoses face numerous technical bottlenecks in practical applications. Particularly at the sealing structures where they mate with connectors, the sealing performance between the hose and connectors is prone to degradation due to long-term exposure to complex operating conditions such as vibration, temperature cycling, and chemical corrosion, leading to coolant or electrolyte leakage. For example, in equipment with frequent or severe vibration, the sealing points between the hose and connectors are easily loosened by repeated mechanical stress, causing coolant leakage. This not only wastes cooling media but may also cause short circuits, overheating, or even safety accidents, severely limiting the service life, safety, and operational stability of liquid-cooled and energy storage systems.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] One of the objectives of this invention is to provide a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, thereby addressing at least one of the technical problems existing in the prior art. This invention achieves the combined use of four types of rubber through formulation design, enabling the product to simultaneously possess high strength, high elasticity, low compression set, and excellent shock absorption performance. While maintaining good flexibility, it significantly improves the product's durability and service life.

[0007] The second objective of this invention is to provide a method for preparing a flame-retardant, highly airtight, and corrosion-resistant composite rubber material.

[0008] The third objective of this invention is to provide a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material, or the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material prepared by the aforementioned preparation method, for use in the preparation of flame-retardant, high-airtightness, and corrosion-resistant rubber pipes.

[0009] The fourth objective of this invention is to provide a flame-retardant, highly airtight, and corrosion-resistant rubber tube.

[0010] The fifth objective of this invention is to provide an application of a flame-retardant, highly airtight, and corrosion-resistant rubber tube in the preparation of liquid-cooled hoses or energy storage hoses.

[0011] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0012] In a first aspect, the present invention provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, the components of which include: butyl rubber, EPDM rubber, chloroprene rubber, chloroprene rubber, fluorinated montmorillonite, and nano-cerium oxide.

[0013] Furthermore, the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material comprises the following components by weight:

[0014] 40-90 parts butyl rubber, 10-50 parts EPDM rubber, 10-50 parts chloroprene rubber, 10-50 parts chloroprene rubber, 5-12 parts fluorinated montmorillonite and 10-20 parts nano-cerium oxide.

[0015] Furthermore, the components of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material also include: fillers, deodorizers, plasticizers, stearic acid, antioxidants, paraffin wax, flame retardants, processing aids, accelerators, vulcanizing resins, and vulcanizing agents;

[0016] Preferably, the filler comprises carbon black;

[0017] Preferably, the flame retardant includes one or more of Longsafe 210, Betachem SFR-4D, and Betachem SFR-3B;

[0018] Preferably, the processing aid includes one or more of WB16, Struktol WB212, and ADDITEK 16;

[0019] Preferably, the accelerator comprises HVA-2 and / or CBS-80;

[0020] Preferably, the vulcanizing resin includes one or more of SP1055, 202 resin and Tackirol AP-70;

[0021] Preferably, the vulcanizing agent includes one or more of S-80, Crystex HD OT20, and Rhenogran Is-60.

[0022] Furthermore, the components of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material, by weight parts, also include:

[0023] 30-70 parts carbon black, 20-80 parts flame retardant, 20-80 parts deodorizer, 10-30 parts plasticizer, 0.5-5 parts stearic acid, 0.5-3 parts antioxidant RD, 0.5-3 parts paraffin wax, 1-5 parts processing aid, 0.5-3 parts accelerator HVA-2, 0.5-2 parts accelerator CBS-80, 5-12 parts vulcanizing resin and 0.5-2 parts vulcanizing agent.

[0024] Secondly, the present invention provides a method for preparing a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, comprising the following steps:

[0025] (a) Chloroprene rubber, chloroprene rubber and fluorinated montmorillonite are mixed in one step;

[0026] (b) Butyl rubber, EPDM rubber and nano-cerium oxide are added to the mixture obtained in step (a) and then mixed for a second time to obtain the flame-retardant, high-airtightness and corrosion-resistant composite rubber material.

[0027] Furthermore, in step (b), fillers, deodorizers, plasticizers, stearic acid, antioxidants, processing aids, accelerators, vulcanizing resins and vulcanizing agents are also added to the mixture obtained in step (a).

[0028] Preferably, the temperature of the first mixing step is 100-120°C, and the time is 5-10 minutes;

[0029] Preferably, the temperature of the secondary mixing is 80-100°C and the time is 8-15 minutes.

[0030] Thirdly, the present invention provides an application of a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material or a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material prepared by the aforementioned preparation method in the preparation of flame-retardant, high-airtightness, and corrosion-resistant rubber pipes.

[0031] Fourthly, the present invention provides a flame-retardant, highly airtight, and corrosion-resistant rubber tube, comprising: an inner layer, a reinforcing layer, and an outer layer;

[0032] The materials of both the inner and outer layers include the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material or the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material prepared by the preparation method described above.

[0033] The skeleton layer is disposed outside the inner layer, and the outer layer is disposed outside the skeleton layer.

[0034] Furthermore, the flame-retardant, high-airtightness, and corrosion-resistant rubber tube is prepared through the following steps:

[0035] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is extruded to form an inner layer, and then a skeleton layer is formed on the outer surface of the inner layer. After that, the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is extruded onto the skeleton layer to form an outer layer.

[0036] Preferably, after forming the inner layer, the skeleton layer and the outer layer, vulcanization, plastic stripping and core removal are performed in sequence to obtain the flame-retardant, high-airtightness and corrosion-resistant rubber tube;

[0037] Preferably, the thickness of the inner layer is 1 to 5 mm;

[0038] Preferably, the thickness of the skeleton layer is 0.5–3 mm;

[0039] Preferably, the thickness of the outer layer is 0.8–5 mm;

[0040] Preferably, the material of the skeleton layer includes impregnated polyester yarn and / or impregnated aramid yarn.

[0041] Fifthly, the present invention provides an application of a flame-retardant, high-airtightness, and corrosion-resistant rubber tube in the preparation of liquid-cooled hoses or energy storage hoses.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] The flame-retardant, airtight, and corrosion-resistant composite rubber material provided by this invention uses butyl rubber, EPDM rubber, chloroprene rubber, and chloroprene rubber as the matrix rubber. IIR (butyl rubber) exhibits low air permeability and high damping characteristics; EPDM (ethylene propylene diene monomer) possesses excellent weather resistance and ozone resistance; CR (chloroprene rubber) has good mechanical strength and flame retardancy; and ECO (chloroprene rubber) demonstrates outstanding performance in oil resistance and chemical corrosion resistance. Through formulation design, the four rubbers are used in combination, achieving excellent comprehensive physical properties. This allows the product to simultaneously possess high strength, high elasticity, low compression set, and excellent shock absorption performance. While maintaining good flexibility, it significantly improves the product's sealing performance, durability, and service life, meeting the stringent requirements of complex physical properties for liquid cooling / energy storage system applications. In addition, the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material also contains fluorinated montmorillonite (F-MMT). Fluorinated montmorillonite is obtained through fluorination treatment, which changes the surface from hydrophilic to hydrophobic, improving its compatibility with non-polar rubbers such as EPDM and IIR, and also enhancing the barrier performance of the hose to coolant. The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material also contains nano-cerium oxide, which can inhibit thermal aging and extend the service life of liquid-cooled hoses under high-temperature conditions. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of the flame-retardant, airtight, and corrosion-resistant rubber tube provided by the present invention. Detailed Implementation

[0046] Unless otherwise defined herein, the scientific and technical terms used in conjunction with this invention shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The first aspect of this invention provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, the components of which include: butyl rubber, EPDM rubber, chloroprene rubber, chloroprene rubber, fluorinated montmorillonite, and nano-cerium oxide.

[0049] In some preferred embodiments, the components of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material further include: fillers, deodorizers, plasticizers, stearic acid, antioxidants, paraffin wax, processing aids, accelerators, vulcanizing resins, and vulcanizing agents;

[0050] Preferably, the filler comprises carbon black.

[0051] In this invention, carbon black is a reinforcing filler, and its core function is to significantly improve the mechanical properties of the material.

[0052] Preferably, the flame retardant includes one or more of Longsafe 210, Betachem SFR-4D, and Betachem SFR-3B;

[0053] Preferably, the processing aid includes one or more of WB16, Struktol WB212, and ADDITEK 16;

[0054] Preferably, the accelerator comprises HVA-2 and / or CBS-80;

[0055] Preferably, the vulcanizing resin includes one or more of SP1055, 202 resin and Tackirol AP-70;

[0056] Preferably, the vulcanizing agent includes one or more of S-80, Crystex HD OT20, and Rhenogran Is-60.

[0057] This invention, through rubber formulation design, enables the four main rubbers of the invention to form a synergistic effect with fluorinated montmorillonite (F-MMT) and nano-cerium oxide, which significantly improves the barrier properties and sealing performance of the coolant in the product, greatly reduces the amount of coolant seepage, and extends the service life of the product.

[0058] Specifically, IIR (butyl rubber) has excellent airtightness, resistance to chemical media (especially electrolytes), and resistance to coolants; EPDM (ethylene propylene diene monomer rubber) is resistant to high temperatures and ozone; CR (chloroprene rubber) improves flexibility, increases bending radius, and reduces cost; and ECO (chloroprene rubber) provides reactive sites for IIR rubber, which can produce synergistic effects with IIR, EPDM, and NR under the action of vulcanizing resin.

[0059] The combined use of IIR and EPDM balances resistance to media and temperature, while CR improves processability. ECO rubber molecular chains contain polar groups, and some active groups in the vulcanized resin can chemically react with these polar groups to form a cross-linked structure. Taking phenolic resin as an example, under high-temperature conditions, phenolic resin dehydrates to form a benzoquinone methylene intermediate. This intermediate can undergo a Diels-Alder reaction with rubber molecules containing double bonds to achieve cross-linking. The polar groups and epoxy structure on the molecular chain can undergo nucleophilic substitution and addition reactions with the benzoquinone methylene intermediate to form C-Cl bonds, connecting the two rubber molecular chains to construct an interpenetrating network structure, thereby achieving synergistic cross-linking and improving the overall material performance.

[0060] Chlorinated ether rubber (ECO) contains chlorine atoms in its molecular chain, while IIR rubber (butyl rubber) requires chlorine to participate in the crosslinking reaction. When ECO is blended with IIR rubber, the chlorine atoms in the ECO rubber can serve as active sites for the crosslinking reaction of the IIR rubber.

[0061] The active groups of vulcanized resins (such as the methylene structure of benzoquinone in phenolic resins) can undergo different types of chemical reactions with four types of rubber molecular chains. With IIR rubber, crosslinking can be achieved through nucleophilic substitution reactions with the assistance of chlorine atoms in ECO rubber; with EPDM rubber, an addition reaction occurs with the double bonds in the side chains; with NR rubber, a reaction occurs with the double bonds and active hydrogen atoms on the molecular chains; and with ECO rubber, a reaction may occur with epoxy groups and chlorine atoms. Multiple crosslinking reactions occur simultaneously, forming a complex and interwoven three-dimensional network structure. This synergistic construction of the crosslinked network is more stable and denser than the network formed by vulcanizing a single rubber, greatly enhancing the overall degree of crosslinking in the rubber material.

[0062] The high airtightness of IIR rubber compensates for the shortcomings of other rubbers in sealing performance; the excellent weather resistance and heat resistance of EPDM rubber enhance the stability of the system in harsh environments; the high elasticity and high strength of CR rubber provide a good mechanical basis for the material; and the oil resistance and ozone resistance of ECO rubber enhance the material's resistance to special media and environments. The properties of the four rubber compounds complement each other, and the stable cross-linking network formed by the vulcanizing resin enables the material to achieve synergistic improvement in multiple properties, overcoming the limitations of single rubber properties.

[0063] When four rubber compounds are blended and vulcanized with a vulcanizing resin, the processing properties of the compound, such as flowability and plasticity, change. The high viscosity of IIR rubber improves the overall roll wrapping properties of the compound; the good flowability of EPDM rubber facilitates mold filling; the plasticity of NR rubber makes the mixing process smoother; and the moderate hardness of ECO rubber adjusts the overall hardness and stiffness of the compound. The synergistic effect of these multiple rubber compounds optimizes the processing properties of the compound, reduces processing difficulty, and improves production efficiency and product quality stability.

[0064] After synergistic vulcanization of the four rubber compounds, the tensile strength is significantly improved compared to a single rubber, reaching 20-35 MPa, an increase of approximately 30%-50% compared to a single NR rubber; the elongation at break increases to 500%-800%, enhancing the material's toughness and deformation capacity; and the tear strength is significantly increased, effectively resisting crack propagation and making it less prone to damage under external impact. This is due to the complex network structure and complementary properties formed by synergistic cross-linking, which allows stress to be effectively transferred and dispersed between different rubber molecular chains, fully leveraging the advantages of each rubber.

[0065] Furthermore, the combination of butyl rubber, EPDM rubber, chloroprene rubber, and chloroprene rubber in this invention exhibits excellent processing adaptability. This combination optimizes rheological properties during compounding, vulcanization, and other processing steps. The low heat generation of IIR helps reduce processing energy consumption, the good flowability of EPDM improves the extrusion and calendering properties of the compound, the self-adhesiveness of CR is beneficial for molding, and the thermal stability of ECO ensures a more stable and controllable vulcanization process. Combining the weather resistance advantages of EPDM and CR, liquid-cooled hoses / energy storage hoses maintain good performance even under harsh environments such as ultraviolet radiation, ozone, and high and low temperatures, effectively resisting aging and cracking. Simultaneously, the oil and chemical resistance of ECO complements the other rubbers, enabling the product to be used for extended periods in various complex chemical media environments. This invention breaks through the limitations of traditional rubber formulations, creatively achieving a synergistic effect through a specific formulation of four rubbers with different properties. This not only fully leverages the advantages of each rubber but also creates new composite properties. The combination of IIR / EPDM / CR / ECO achieves a balance of airtightness, media resistance, temperature resistance, ozone resistance, and flexibility. The formulation design must be zinc-free and sodium-free to avoid contamination of the coolant, and the vulcanization process should result in lower compression set.

[0066] Furthermore, fluorinated montmorillonite (F-MMT) was incorporated into the formulation. Montmorillonite (MMT), as a nanofiller, is commonly used in rubber modification to improve material properties. However, ordinary MMT has limited compatibility with rubber and cannot effectively prevent the penetration of certain polar molecules in coolant, limiting its application in liquid-cooled hoses. This was achieved through a specific surface fluorination process to modify montmorillonite. Fluorine gas reacts with montmorillonite at high temperatures, grafting fluorine-containing groups onto the surface of the montmorillonite sheets. This transforms the surface of montmorillonite from hydrophilic to hydrophobic, effectively enhancing its compatibility with non-polar rubbers such as EPDM and IIR. Simultaneously, nanoscale channels are formed between the F-MMT sheets. These channels repel polar molecules (such as ethylene glycol) in the coolant, significantly improving the hose's barrier performance against coolant. After modification, the interlayer spacing of F-MMT is expanded to 1.5-2.0 nm, which creates a nanoscale barrier for the penetration of coolant molecules, greatly reducing the coolant penetration rate. Its coolant penetration is reduced by more than 60% compared with traditional hoses.

[0067] The formulation of this invention also incorporates nano-cerium oxide, which catalyzes the decomposition of ethylene glycol oxidation products, inhibits thermal aging (particle size ≤20nm), and extends the service life of liquid-cooled hoses under high-temperature conditions. 3+ / Ce 4+Redox reactions can efficiently scavenge free radicals generated by ultraviolet radiation and thermal oxidation, delaying the degradation of the IIR backbone, making it particularly suitable for liquid-cooled hoses / energy storage hoses with high airtightness requirements. Nano-cerium particles fill the gaps between polymer chains, reducing gas permeability and synergizing with the inherently low permeability of IIR. Nano-cerium oxide adsorbs ozone on its surface and catalyzes its decomposition into oxygen, protecting the double bonds in rubber from attack. Synergistically with paraffin-based physical protective agents, paraffin forms a surface barrier while cerium oxide provides internal chemical protection, creating a dual mechanism to resist environmental aging. Nanoparticles exist stably in oil media, reducing swelling and delaying the erosion of the polymer network by oil molecules. In dynamic seals, cerium oxide synergistically reduces the coefficient of friction with wear-resistant fillers (such as carbon black), extending product lifespan. Under dynamic stress, cerium oxide catalyzes the reconnection of broken rubber molecules, synergistically enhancing microcrack repair capabilities with sulfur-containing vulcanization systems.

[0068] In some preferred embodiments, the flame-retardant, highly airtight, and corrosion-resistant composite rubber material comprises the following components by weight:

[0069] 40-90 parts butyl rubber, 10-50 parts EPDM rubber, 10-50 parts chloroprene rubber, 10-50 parts chloroprene rubber, 5-12 parts fluorinated montmorillonite and 10-20 parts nano-cerium oxide.

[0070] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 40 to 90 parts of butyl rubber, for example, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, etc., by weight.

[0071] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 10 to 50 parts of EPDM rubber, for example, 10, 15, 20, 25, 30, 35, 40, 45, or 50 parts by weight.

[0072] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 10 to 50 parts of chloroprene rubber, for example, 10, 15, 20, 25, 30, 35, 40, 45, or 50 parts by weight.

[0073] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 10 to 50 parts of chlorinated ether rubber, for example, 10, 15, 20, 25, 30, 35, 40, 45, or 50 parts by weight.

[0074] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 5 to 12 parts of fluorinated montmorillonite, for example, 5, 6, 7, 8, 9, 10, 11, or 12 parts by weight.

[0075] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 10 to 20 parts of nano-cerium oxide, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts by weight.

[0076] More preferably, the addition amounts of the four matrix rubbers are: 50-70 parts butyl rubber, 10-20 parts ethylene propylene diene monomer (EPDM) rubber, 10-20 parts chloroprene rubber, and 10-30 parts chloroprene rubber.

[0077] In some preferred embodiments, the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material further comprises, by weight parts:

[0078] 30-70 parts carbon black, 20-80 parts flame retardant, 20-80 parts deodorizer, 10-30 parts plasticizer, 0.5-5 parts stearic acid, 0.5-3 parts antioxidant RD, 0.5-3 parts paraffin wax, 1-5 parts processing aid, 0.5-3 parts accelerator HVA-2, 0.5-2 parts accelerator CBS-80, 5-12 parts vulcanizing resin and 0.5-2 parts vulcanizing agent.

[0079] More preferably, the components of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material further include, by weight parts: 30-70 parts carbon black N550, 20-80 parts flame retardant, 20-80 parts deodorizer Imersorb, 10-30 parts plasticizer 2280, 0.5-5 parts stearic acid, 0.5-3 parts antioxidant RD, 0.5-3 parts paraffin wax, 1-5 parts processing aid WB16, 0.5-3 parts accelerator HVA-2, 0.5-2 parts accelerator CBS-80, 5-12 parts vulcanizing resin SP1055, and 0.5-2 parts vulcanizing agent S-80.

[0080] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 30 to 70 parts of carbon black by weight, for example, 30, 35, 40, 45, 50, 55, 60, 65, or 70 parts.

[0081] The flame-retardant, high-airtightness, corrosion-resistant composite rubber material contains 20 to 80 parts of flame retardant, for example, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80 parts, etc., by weight.

[0082] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 20 to 80 parts of deodorizing agent by weight, for example, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, etc.

[0083] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 10 to 30 parts of plasticizer by weight, for example, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, etc.

[0084] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 0.5 to 5 parts of stearic acid, for example, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc., by weight.

[0085] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 0.5 to 3 parts of antioxidant RD by weight, for example, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, etc.

[0086] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 0.5 to 3 parts of paraffin wax, for example, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, etc., by weight.

[0087] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 1 to 5 parts of processing aids by weight, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, etc.

[0088] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 0.5 to 3 parts of accelerator HVA-2 by weight, for example, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, etc.

[0089] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 0.5 to 2 parts of accelerator CBS-80 by weight, for example, 0.5 parts, 1 part, 1.5 parts, 2 parts, etc.

[0090] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 5 to 12 parts of vulcanized resin, for example, 5, 6, 7, 8, 9, 10, 11, or 12 parts by weight.

[0091] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material contains 0.5 to 2 parts of vulcanizing agent by weight, for example, 0.5 parts, 1 part, 1.5 parts, 2 parts, etc.

[0092] A second aspect of this invention provides a method for preparing a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, comprising the following steps:

[0093] (a) Chloroprene rubber, chloroprene rubber and fluorinated montmorillonite are mixed in one step;

[0094] (b) Butyl rubber, EPDM rubber and nano-cerium oxide are added to the mixture obtained in step (a) and then mixed for a second time to obtain the flame-retardant, high-airtightness and corrosion-resistant composite rubber material.

[0095] In some preferred embodiments, in step (b), fillers, deodorizers, plasticizers, stearic acid, antioxidants, processing aids, accelerators, vulcanizing resins and vulcanizing agents are also added to the mixture obtained in step (a).

[0096] Preferably, the temperature of the first mixing step is 100-120°C, and the time is 5-10 minutes;

[0097] Preferably, the temperature of the secondary mixing is 80-100°C and the time is 8-15 minutes.

[0098] In a preferred embodiment of the present invention, the preparation process of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is as follows: A stepwise mixing process is employed. First, F-MMT, ECO, and CR are mixed in an internal mixer at 100–120°C for 5–10 minutes. The polarity of ECO and CR interacts with the fluorinated groups on the surface of F-MMT, achieving initial dispersion of F-MMT. Then, EPDM, IIR, nano-cerium oxide, fillers, deodorizers, plasticizers, stearic acid, antioxidants, processing aids, accelerators, vulcanizing resins, and vulcanizing agents are added, and the mixture is mixed in a two-roll mill at 80–100°C for 8–15 minutes to further promote the uniform dispersion of F-MMT throughout the rubber system, resulting in the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material.

[0099] The third aspect of this invention provides an application of a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material, or a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material prepared by the aforementioned preparation method, in the preparation of flame-retardant, high-airtightness, and corrosion-resistant rubber pipes.

[0100] like Figure 1 As shown, a fourth aspect of the present invention provides a flame-retardant, high-airtightness, and corrosion-resistant rubber tube, comprising: an inner layer, a skeleton layer, and an outer layer; the materials of the inner layer and the outer layer both comprise flame-retardant, high-airtightness, and corrosion-resistant composite rubber material or flame-retardant, high-airtightness, and corrosion-resistant composite rubber material prepared by the aforementioned preparation method; the skeleton layer is disposed outside the inner layer, and the outer layer is disposed outside the skeleton layer.

[0101] Specifically, the flame-retardant, high-airtightness, and corrosion-resistant rubber hose adopts a three-layer composite structure. The inner layer, the reinforcing layer, and the outer layer are all tubular structures. The reinforcing layer covers the outer surface of the inner layer, and the outer layer covers the outer surface of the reinforcing layer. The inner layer is used for direct contact with fluids (coolant, electrolyte), and must be resistant to media corrosion (zinc-free), have excellent airtightness, and low compression set. The middle reinforcing layer enhances mechanical properties (compression resistance, tensile strength, and pulse resistance) to adapt to different working conditions. The outer layer protects against environmental erosion (ozone resistance, flame retardancy, and aging resistance) and has low compression set. Both the inner and outer layers are made of flame-retardant, high-airtightness, and corrosion-resistant composite rubber material.

[0102] In some preferred embodiments, the flame-retardant, highly airtight, and corrosion-resistant rubber tube is prepared by the following steps:

[0103] The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is extruded to form an inner layer, and then a skeleton layer is formed on the outer surface of the inner layer. After that, the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is extruded onto the skeleton layer to form an outer layer.

[0104] Preferably, after forming the inner layer, the skeleton layer and the outer layer, vulcanization, plastic stripping and core removal are performed in sequence to obtain the flame-retardant, high-airtightness and corrosion-resistant rubber tube;

[0105] Preferably, the thickness of the inner layer is 1 to 5 mm, for example, it can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.;

[0106] Preferably, the thickness of the skeleton layer is 0.5 to 3 mm, for example, it can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.;

[0107] Preferably, the thickness of the outer layer is 0.8 to 5 mm, for example, it can be 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0108] Preferably, the material of the skeleton layer includes impregnated polyester yarn and / or impregnated aramid yarn.

[0109] In this invention, PET (impregnated polyester yarn) is suitable for environments with conventional pressure (≤2.5MPa) and temperature ≤125℃, and is low in cost; AR (impregnated aramid yarn) is used in scenarios requiring high pressure (≥2.5MPa), high temperature (≤150℃), or high fatigue resistance. Furthermore, this invention preferably uses braiding or winding processes to prepare the skeleton layer. In the braiding process, the braiding angle is 40°~60°, which can balance axial strength, radial compressive strength, and assembly performance. Impregnation with epoxy resin can also be performed to enhance the adhesion between the rubber and the skeleton layer.

[0110] The preparation process in this invention ensures that F-MMT is fully dispersed in the rubber matrix, maximizing its performance advantages. It forms the inner and outer layer materials of the liquid-cooled / energy-storage hose. The intermediate skeleton layer can be configured with PET (impregnated polyester thread) or AR (impregnated aramid thread) depending on the actual scenario, temperature, environment, and pressure of the liquid-cooled / energy-storage hose. The inner layer thickness is 1–5 mm, the intermediate skeleton layer thickness is 0.5–3 mm, the outer layer thickness is 0.8–5 mm, and the hose temperature resistance rating is -40℃ to 120℃.

[0111] In the optional embodiments of the present invention, the preferred preparation process of the flame-retardant, high-airtightness, and corrosion-resistant rubber tube is as follows:

[0112] (1) Preparation of inner and outer rubber layers: Mixing: The formulation of flame-retardant, high airtight and corrosion-resistant rubber material is mixed according to the process → open milling → thin pass → sheeting → rapid inspection;

[0113] (2) Core extrusion: Use a TPX core rod with a diameter 0.1 to 0.2 mm smaller than the target inner diameter and extrude it together with the inner rubber layer;

[0114] (3) Skeleton layer weaving: PET / AR yarn is uniformly woven / wound onto the inner layer surface after being impregnated with epoxy resin;

[0115] (4) Extrusion and coating of outer rubber: The outer rubber material is extruded and coated onto the skeleton layer, and at the same time, plastic coating is performed to protect the appearance of the outer rubber and improve the adhesion between the layers of the pipeline.

[0116] (5) Vulcanization, peeling and core removal: Direct vulcanization is adopted: 175℃×40min. After vulcanization, peeling is carried out under the external plastic heat state and left for 4 hours. The TPX core rod is removed by water pressure to obtain flame-retardant, high airtight and corrosion-resistant rubber tube.

[0117] The fifth aspect of this invention provides the application of a flame-retardant, high-airtightness, and corrosion-resistant rubber tube in the preparation of liquid-cooled hoses or energy storage hoses.

[0118] The flame-retardant, airtight, and corrosion-resistant rubber hose provided by this invention can be used as a liquid-cooled hose or an energy storage hose, and can be applied to liquid-cooled servers and energy storage systems.

[0119] The present invention will be further illustrated below by way of examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or purchased directly from the market.

[0120] In the following examples and comparative examples, the fluorinated montmorillonite used was: Fluorinated montmorillonite from Shanghai Aladdin Biochemical Technology Co., Ltd. (trade name: Fluorinated Montmorillonite, model: FMT-100, fluorine content 8-10wt%, average particle size 1-5μm, XRD interlayer spacing 1.8-2.0nm).

[0121] In the following examples and comparative examples, the average particle size of the cerium nanoparticles used was 5-50 nm (measured by transmission electron microscopy TEM), the purity was ≥99.5% (free from heavy metal impurities), and the specific surface area was 50-150 m². 2 / g (determined by BET method), and has a cubic phase structure (XRD characteristic peaks 2θ = 28.5°, 47.5°, 56.3°).

[0122] Example 1

[0123] This embodiment provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, which comprises the following components by weight:

[0124] 60 parts butyl rubber, 15 parts EPDM rubber, 15 parts chloroprene rubber, 10 parts chloroprene rubber, 8 parts fluorinated montmorillonite, 15 parts nano cerium oxide, 50 parts carbon black N550, 20 parts flame retardant Longsafe210, 20 parts deodorizer Imersorb, 20 parts plasticizer 2280, 1 part stearic acid, 0.8 parts antioxidant RD, 1 part paraffin wax, 1 part processing aid WB16, 3 parts accelerator HVA-2, 1 part accelerator CBS-80, 9 parts vulcanizing resin SP1055 and 1 part vulcanizing agent S-80; totaling 250.8 parts by weight, with a rubber content of approximately 39.9%;

[0125] The preparation process of flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is as follows:

[0126] Step 1: Mix the prescribed amounts of chloroprene rubber, chloroprene rubber, and fluorinated montmorillonite in a mixer at 110°C for 8 minutes.

[0127] Step 2: Then, add butyl rubber, EPDM rubber, nano cerium oxide, carbon black N550, flame retardant Longsafe 210, deodorizer Imersorb, plasticizer 2280, stearic acid, antioxidant RD, paraffin wax, processing aid WB16, accelerator HVA-2, accelerator CBS-80, vulcanizing resin SP1055, and vulcanizing agent S-80 to the mixture obtained in Step 1. Mix the remaining raw materials in a two-roll mill at 90°C to obtain a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material.

[0128] Example 2

[0129] This embodiment provides a flame-retardant, airtight, and corrosion-resistant composite rubber material, which differs from Embodiment 1 in that the proportions of the four matrix rubbers are different: butyl rubber is 50 parts, EPDM rubber is 10 parts, chloroprene rubber is 10 parts, and chloroprene rubber is 30 parts; the rest is the same as in Embodiment 1.

[0130] Example 3

[0131] This embodiment provides a flame-retardant, airtight, and corrosion-resistant composite rubber material, which differs from Embodiment 1 in that the proportions of the four matrix rubbers are different: 60 parts of butyl rubber, 10 parts of EPDM rubber, 10 parts of chloroprene rubber, and 20 parts of chloroprene rubber; the rest is the same as in Embodiment 1.

[0132] Example 4

[0133] This embodiment provides a flame-retardant, airtight, and corrosion-resistant composite rubber material. The difference between this embodiment and Embodiment 1 is that the proportions of the four matrix rubbers are different: 65 parts of butyl rubber, 10 parts of EPDM rubber, 10 parts of chloroprene rubber, and 15 parts of chloroprene rubber; the rest is the same as in Embodiment 1.

[0134] Example 5

[0135] This embodiment provides a flame-retardant, airtight, and corrosion-resistant composite rubber material. The difference between this embodiment and Embodiment 1 is that the proportions of the four matrix rubbers are different: 70 parts of butyl rubber, 10 parts of EPDM rubber, 10 parts of chloroprene rubber, and 10 parts of chloroprene rubber; the rest is the same as in Embodiment 1.

[0136] Example 6

[0137] This embodiment provides a flame-retardant, airtight, and corrosion-resistant composite rubber material. The difference from Embodiment 1 is that the proportions of the four matrix rubbers are different: butyl rubber is 50 parts, EPDM rubber is 20 parts, chloroprene rubber is 20 parts, and chloroprene rubber is 10 parts; the rest is the same as in Embodiment 1.

[0138] Example 7

[0139] This embodiment provides a flame-retardant, airtight, and corrosion-resistant composite rubber material. The difference between this embodiment and Embodiment 1 is that the proportions of the four matrix rubbers are different: 40 parts of butyl rubber, 40 parts of EPDM rubber, 10 parts of chloroprene rubber, and 10 parts of chloroprene rubber. The rest is the same as in Embodiment 1.

[0140] Example 8

[0141] This embodiment provides a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material, differing from Example 1 in the following aspects: 5 parts fluorinated montmorillonite, 20 parts nano-cerium oxide, 30 parts carbon black N550, 80 parts flame retardant Longsafe 210, 10 parts plasticizer 2280, 5 parts stearic acid, 0.5 parts antioxidant RD, 3 parts paraffin wax, 1 part processing aid WB16, 0.5 parts accelerator HVA-2, 2 parts accelerator CBS-80, and 5 parts vulcanizing resin SP1055; the rest is the same as in Example 1. The total composition is 283 parts by weight, with a rubber content of approximately 35.3%.

[0142] Example 9

[0143] This embodiment provides a flame-retardant, high-airtightness, and corrosion-resistant composite rubber material, differing from Example 1 in the following aspects: 12 parts fluorinated montmorillonite, 10 parts nano-cerium oxide, 70 parts carbon black N550, 20 parts flame retardant Longsafe 210, 30 parts plasticizer 2280, 0.5 parts stearic acid, 3 parts antioxidant RD, 0.5 parts paraffin wax, 5 parts processing aid WB16, 3 parts accelerator HVA-2, 0.5 parts accelerator CBS-80, and 12 parts vulcanizing resin SP1055; the rest is the same as in Example 1. The total composition is 287.5 parts by weight, with a rubber content of approximately 34.8%.

[0144] Example 10

[0145] This embodiment provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, which differs from Example 1 in that it does not contain paraffin wax; otherwise, it is identical to Example 1. The total composition is 249.8 parts by weight, with a rubber content of approximately 40%.

[0146] Application Example 1-10

[0147] This application example provides a flame-retardant, highly airtight, and corrosion-resistant rubber hose, the preparation process of which is as follows:

[0148] (1) Preparation of inner and outer layers: In Examples 1-10, the flame-retardant, high-airtightness, and corrosion-resistant composite rubber materials prepared in Examples 1-10 were used as the inner and outer layers, respectively. The composite rubber materials were then subjected to thin-pass, sheeting, and rapid inspection in sequence.

[0149] (2) Core extrusion: Use a TPX core rod with a diameter 0.1 to 0.2 mm smaller than the target inner diameter and extrude it together with the inner layer;

[0150] (3) Skeleton layer weaving: PET yarn is evenly woven onto the inner layer surface after being impregnated with resin;

[0151] (4) External rubber extrusion and plastic coating: The outer rubber material is extruded and coated onto the skeleton layer to form the outer layer, and plastic coating is performed at the same time.

[0152] (5) Vulcanization, peeling and core removal: Direct vulcanization is adopted: 175℃×40min. After vulcanization, peeling is carried out under the external plastic heat state and left for 4 hours. The TPX core rod is removed by water pressure to obtain flame-retardant, high airtight and corrosion-resistant rubber tube.

[0153] Comparative Example 1

[0154] This comparative example provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, which differs from Example 1 in that: no chlorinated ether rubber is added; the remaining components are the same as in Example 1.

[0155] Comparative Example 2

[0156] This comparative example provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, which differs from Example 1 in that chlorinated polyethylene rubber is used instead of chlorinated ether rubber; the remaining components are the same as in Example 1.

[0157] Comparative Example 3

[0158] This comparative example provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, which differs from Example 1 in that chlorosulfonated polyethylene rubber is used instead of chloroprene rubber; the remaining components are the same as in Example 1.

[0159] Comparative Example 4

[0160] This comparative example provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, which differs from Example 1 in that montmorillonite is used instead of fluorinated montmorillonite; the remaining components are the same as in Example 1.

[0161] Comparative Example 5

[0162] This comparative example provides a flame-retardant, highly airtight, and corrosion-resistant composite rubber material, which differs from Example 1 in that: no nano-cerium oxide is added; the remaining components are the same as in Example 1.

[0163] Compare and contrast examples 1-5

[0164] This application example provides a flame-retardant, high-airtightness, and corrosion-resistant rubber tube. The difference between this example and application example 1 is that application examples 1-5 use the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material prepared in comparative examples 1-5 as the inner and outer layers, respectively.

[0165] Test case

[0166] Test samples: Flame-retardant, airtight, and corrosion-resistant rubber tubes prepared in Application Examples 1-10 and Comparative Application Examples 1-5 were used as samples for testing.

[0167] Test method:

[0168] Helium gas was used to test the airtightness (pressure held at 10 bar for 20 minutes);

[0169] Flame retardancy test UL94-V0 rating (vertical burning method);

[0170] Durability test conditions: coolant flow rate 5m / s, amplitude 2mm, frequency 20Hz, medium is 50% ethylene glycol aqueous solution, 1 million cycles.

[0171] The test results are shown in Table 1.

[0172] Table 1

[0173]

[0174]

[0175]

[0176] As can be seen from the data in Table 1, the product prepared using the composite rubber formulation provided by this invention is superior to traditional products in terms of mechanical properties, airtightness, coolant barrier properties, and durability.

[0177] Of the applications in Examples 1-10, the product in Application Example 1 exhibits the best overall performance. The liquid cooling / energy storage hose in Application Example 1, made with different raw rubber combinations, shows the best overall performance when the inner / outer layer IIR:EPDM:CR:ECO ratio is 60:15:15:10. By incorporating fluorinated montmorillonite (F-MMT) and nano-cerium oxide, it demonstrates excellent tensile strength, tear strength, and fatigue resistance. Through testing at a coolant flow rate of 5 m / s, amplitude of 2 mm, frequency of 20 Hz, and a 50% ethylene glycol aqueous solution as the medium, and undergoing 1 million cycles, its fatigue life is significantly improved, approximately 2.5 times that of the original product, meeting the long-term use requirements of liquid cooling hoses and extending their service life. The coolant barrier properties are significantly improved, with coolant permeation reduced by more than 60% compared to traditional liquid cooling hoses. Among them, in Application Examples 1-7, the rubber formulations of Application Examples 1-5 achieved a better balance of mechanical properties, sealing performance, durability and coolant barrier properties within the preferred range of 50-70 parts of IIR, 10-20 parts of EPDM, 10-20 parts of CR and 10-30 parts of ECO.

[0178] As can be seen from Application Example 1 and Comparative Application Examples 1-5, the composite rubber formulation provided by the present invention uses four types of rubber together to form a synergistic effect, and is used in combination with fluorinated montmorillonite and nano-cerium oxide to improve the overall performance of the product. None of the components can be omitted, and any substitution (such as Comparative Examples 2-4) will affect the overall performance of the product.

[0179] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame-retardant, highly airtight, and corrosion-resistant composite rubber material, characterized in that, Its components include: butyl rubber, EPDM rubber, chloroprene rubber, chloroprene rubber, fluorinated montmorillonite, and nano-cerium oxide.

2. The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material according to claim 1, characterized in that, The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material comprises the following components by weight: 40-90 parts butyl rubber, 10-50 parts EPDM rubber, 10-50 parts chloroprene rubber, 10-50 parts chloroprene rubber, 5-12 parts fluorinated montmorillonite and 10-20 parts nano-cerium oxide.

3. The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material according to claim 1, characterized in that, The components of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material also include: fillers, deodorizers, plasticizers, stearic acid, antioxidants, paraffin wax, flame retardants, processing aids, accelerators, vulcanizing resins, and vulcanizing agents; Preferably, the filler comprises carbon black; Preferably, the flame retardant includes one or more of Longsafe 210, Betachem SFR-4D, and Betachem SFR-3B; Preferably, the processing aid includes one or more of WB16, Struktol WB212, and ADDITEK 16; Preferably, the accelerator comprises HVA-2 and / or CBS-80; Preferably, the vulcanizing resin includes one or more of SP1055, 202 resin and Tackirol AP-70; Preferably, the vulcanizing agent includes one or more of S-80, Crystex HD OT20, and Rhenogran Is-60.

4. The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material according to claim 3, characterized in that, The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material also includes, by weight parts: 30-70 parts carbon black, 20-80 parts flame retardant, 20-80 parts deodorizer, 10-30 parts plasticizer, 0.5-5 parts stearic acid, 0.5-3 parts antioxidant RD, 0.5-3 parts paraffin wax, 1-5 parts processing aid, 0.5-3 parts accelerator HVA-2, 0.5-2 parts accelerator CBS-80, 5-12 parts vulcanizing resin and 0.5-2 parts vulcanizing agent.

5. The preparation method of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material as described in claims 1-4, characterized in that, Includes the following steps: (a) Chloroprene rubber, chloroprene rubber and fluorinated montmorillonite are mixed in one step; (b) Butyl rubber, EPDM rubber and nano-cerium oxide are added to the mixture obtained in step (a) and then mixed for a second time to obtain the flame-retardant, high-airtightness and corrosion-resistant composite rubber material.

6. The preparation method according to claim 5, characterized in that, In step (b), fillers, deodorizers, plasticizers, stearic acid, antioxidants, processing aids, accelerators, vulcanizing resins and vulcanizing agents are also added to the mixture obtained in step (a). Preferably, the temperature of the first mixing step is 100-120°C, and the time is 5-10 minutes; Preferably, the temperature of the secondary mixing is 80-100°C and the time is 8-15 minutes.

7. The application of the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material as described in claims 1-4, or the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material prepared by the preparation method described in claim 5 or 6, in the preparation of flame-retardant, high-airtightness, and corrosion-resistant rubber pipes.

8. A flame-retardant, highly airtight, and corrosion-resistant rubber hose, characterized in that, include: Inner layer, skeleton layer, and outer layer; The materials of the inner layer and the outer layer both include the flame-retardant, high airtight, and corrosion-resistant composite rubber material as described in any one of claims 1-4, or the flame-retardant, high airtight, and corrosion-resistant composite rubber material prepared by the preparation method described in claim 5 or 6. The skeleton layer is disposed outside the inner layer, and the outer layer is disposed outside the skeleton layer.

9. The flame-retardant, high-airtightness, corrosion-resistant rubber hose according to claim 7, characterized in that, The flame-retardant, high-airtightness, and corrosion-resistant rubber tube is prepared through the following steps: The flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is extruded to form an inner layer, and then a skeleton layer is formed on the outer surface of the inner layer. After that, the flame-retardant, high-airtightness, and corrosion-resistant composite rubber material is extruded onto the skeleton layer to form an outer layer. Preferably, after forming the inner layer, the skeleton layer and the outer layer, vulcanization, plastic stripping and core removal are performed in sequence to obtain the flame-retardant, high-airtightness and corrosion-resistant rubber tube; Preferably, the thickness of the inner layer is 1 to 5 mm; Preferably, the thickness of the skeleton layer is 0.5–3 mm; Preferably, the thickness of the outer layer is 0.8–5 mm; Preferably, the material of the skeleton layer includes impregnated polyester yarn and / or impregnated aramid yarn.

10. The application of the flame-retardant, high-airtightness, and corrosion-resistant rubber hose as described in claim 8 or 9 in the preparation of liquid-cooled hoses or energy storage hoses.

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