Thermal insulation rubber tube and preparation method and application thereof

Abstract

The application provides a heat preservation rubber tube, which is a modified nitrile rubber heat preservation rubber tube; the outer side of the tube wall of the heat preservation rubber tube is provided with a heat preservation layer with air holes. In the vulcanization process, micro air holes are formed, a heat preservation layer with low heat transfer effect is formed on the outer layer of the rubber tube, the air movement in the bubbles is seriously hindered, and the 'convective heat conductor' effect formed by the micro holes on the rubber material prevents the air from flowing, thereby preventing the heat transfer and achieving good heat preservation effect and avoiding the rubber tube from being frozen and cracked. The application effectively avoids the limitation of rubber material selection, avoids the multi-stage processing of the rubber material, improves the production efficiency, achieves the heat preservation effect through the microstructure change after the vulcanization of the rubber material, and is more convenient to operate. The preparation process provided by the application is simple, the conditions are mild, and the controllability is strong, so that the application is more conducive to industrialization promotion and application.

Description

Technical Field

[0001] This invention belongs to the technical field of thermal insulation hoses for hydraulic hoses, and relates to a thermal insulation hose, its preparation method, and its application. Background Technology

[0002] Hydraulic hoses are mainly composed of a liquid-resistant inner rubber layer, a middle rubber layer, 2, 4, or 6 layers of steel wire spiral reinforcement, and an outer rubber layer. The inner rubber layer allows the conveyed medium to withstand pressure and protects the steel wire from corrosion. The outer rubber layer protects the steel wire from damage, and the steel wire layer acts as a reinforcing skeleton. Hydraulic hoses are commonly used for hydraulic power transmission or conveying high-pressure media such as water, gas, and oil to ensure liquid circulation and energy transfer. They are mainly used in hydraulic supports in mines and oilfields, and are suitable for engineering construction, lifting and transportation, metallurgical forging, mining equipment, ships, injection molding machinery, agricultural machinery, various machine tools, and various industrial mechanized and automated hydraulic systems for conveying petroleum-based (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquids (such as emulsions, oil-water emulsions, and water) at certain pressures (high pressure) and temperatures.

[0003] Because hydraulic hoses are frequently used in low-temperature environments (i.e., cryogenic hoses), their surfaces require additional insulation. However, existing cryogenic hose insulation suffers from deficiencies in balancing ozone aging resistance and low-temperature performance. On one hand, aging resistance requires sufficient -Cl side groups; on the other hand, -Cl side groups significantly reduce low-temperature resistance, creating a mutual constraint. Furthermore, excessively low hardness makes processing and dispersion difficult. Although existing cryogenic hoses have been improved by increasing molecular chain flexibility, reducing intermolecular forces, lowering molecular weight, and disrupting molecular crystallization—such as using raw rubber with low acrylonitrile content, adding low-molecular-weight cold-resistant plasticizers, and employing multi-stage processing techniques to reduce hardness—the aforementioned balance deficiencies remain difficult to overcome.

[0004] Therefore, finding a more suitable way to solve the above-mentioned problems of existing hydraulic hose cryogenic pipe insulation pipes has become one of the urgent problems to be solved by many front-line researchers in the industry. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a thermal insulation hose, its preparation method, and its application. The thermal insulation hose designed by the present invention is a modified nitrile rubber thermal insulation hose, which has a porous insulation layer on the outer side of its wall to prevent heat transfer, thus playing a good role in insulation and preventing the hose from freezing and cracking; moreover, the process is simple, the conditions are mild, and the controllability is strong, which is more conducive to industrial promotion and application.

[0006] This invention provides a thermal insulation hose, wherein the thermal insulation hose is a modified nitrile rubber thermal insulation hose;

[0007] The outer wall of the insulating hose has an insulating layer with pores.

[0008] Preferably, the modified nitrile rubber includes NV rubber-plastic alloy modified nitrile rubber;

[0009] The diameter of the thermal insulation hose is 18.8–19.8 mm;

[0010] The wall thickness of the thermal insulation hose is 1.5–2 mm;

[0011] The insulating hose is a low-temperature resistant insulating hose.

[0012] Preferably, the thickness of the porous insulation layer is 0.3 mm to 0.7 mm;

[0013] The diameter of the pores is 0.1–0.2 mm;

[0014] The insulated hose includes an insulated hose for hydraulic hoses.

[0015] Preferably, the wall of the heat-insulating hose is provided with a skeleton layer;

[0016] The skeleton is made of one or more of steel wire, fiber, and stainless steel.

[0017] The thermal insulation hose is obtained by foaming and vulcanizing rubber material.

[0018] Preferably, the porous insulation layer is formed during the foaming process;

[0019] The porous insulation layer is an integral structure with the pipe wall, and is not a composite structure.

[0020] The tube wall has a bubble structure;

[0021] The diameter of the bubble is 0.1 to 0.2 mm.

[0022] This invention provides a thermal insulation hose, comprising, by weight of raw materials:

[0023] 60-70 parts by weight of NBR (nitrile butadiene rubber);

[0024] NV rubber-plastic alloy 30-40 parts by weight;

[0025] 3-5 parts by weight of zinc oxide;

[0026] Stearic acid 1 to 1.5 parts by weight;

[0027] 2-3 parts by weight of coumarone resin;

[0028] Antioxidant 0.5 to 1.5 parts by weight;

[0029] Dispersant 1 to 1.5 parts by weight;

[0030] 70-100 parts by weight of carbon black;

[0031] 10-20 parts by weight of light calcium carbonate;

[0032] 7-10 parts by weight of dioctyl sebacate;

[0033] 1-3 parts by weight of 4,4'-oxobisbenzenesulfonylhydrazine;

[0034] 1-3 parts by weight of azodicarbonamide;

[0035] Sulfur, 1-2.5 parts by weight;

[0036] Accelerator: 0.5 to 3.5 parts by weight.

[0037] Preferably, the NBR nitrile rubber includes one or more of NBR1965, NBR1042, NBR3370C, and NBR3370;

[0038] The NV rubber-plastic alloy includes one or more of NV5075, NV7030 and M58;

[0039] The zinc oxide includes nano zinc oxide;

[0040] The antioxidant includes one or more of RD antioxidant, 4010NA antioxidant, BLE antioxidant, and NBC antioxidant;

[0041] The dispersant includes polymethacrylic acid derivatives and / or maleic anhydride copolymers;

[0042] The carbon black includes one or more of carbon black N550, N330 and N660;

[0043] The accelerator is one or more of the following: CZ accelerator, TT accelerator, DZ accelerator, HVA-2 accelerator, and DTDM.

[0044] This invention provides a method for preparing a thermal insulation hose as described in any of the above technical solutions, comprising the following steps:

[0045] 1) After mixing and pressing the raw materials, a rubber compound is obtained;

[0046] 2) The rubber compound and skeleton material obtained in the above steps are extruded and compounded to obtain a tubular matrix containing a skeleton and covered with an outer rubber layer.

[0047] 3) The matrix obtained in the above steps is heat-treated, foamed, and vulcanized to obtain the thermal insulation hose.

[0048] Preferably, the mixing and extrusion method includes tableting using an open mill.

[0049] The heat treatment foaming temperature is 190–240°C;

[0050] The heat treatment foaming time is 10-15 seconds;

[0051] The vulcanization temperature is 148–155°C;

[0052] The vulcanization time is 50–70 minutes;

[0053] The vulcanization pressure is 0.4–0.5 MPa.

[0054] The present invention also provides the application of the thermal insulation hose described in any one of the above technical solutions or the thermal insulation hose prepared by the preparation method described in any one of the above technical solutions in the field of thermal insulation hoses for hydraulic hoses.

[0055] This invention provides a thermal insulation hose, which is a modified nitrile rubber thermal insulation hose. The outer wall of the hose has a porous insulation layer. Compared with the prior art, this invention features a specially designed thermal insulation hose with a specific structure and composition. By adding two specific foaming materials, OBSH and AC, to the formula and further adjusting the preparation process, micropores are formed during vulcanization. This creates a low-heat-transfer insulation layer on the outer surface of the hose, severely hindering air movement within the bubbles. Furthermore, the micropores in the rubber compound prevent airflow, acting as a "convective heat conductor" and preventing heat transfer, thus providing excellent insulation and preventing the hose from freezing and cracking. This invention effectively avoids limitations in rubber material selection and multi-stage processing, improving production efficiency. The insulation effect is achieved through changes in the microstructure of the rubber compound after vulcanization, making operation more convenient. The preparation process provided by this invention is simple, operates under mild conditions, and is highly controllable, making it more suitable for industrial promotion and application. Detailed Implementation

[0056] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims.

[0057] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0058] There are no particular restrictions on the purity of any raw materials used in this invention. However, it is preferred to use analytical grade or conventional purity materials used in the preparation of sodium-ion battery anode materials.

[0059] This invention provides a thermal insulation hose, wherein the thermal insulation hose is a modified nitrile rubber thermal insulation hose;

[0060] The outer wall of the insulating hose has an insulating layer with pores.

[0061] In this invention, the modified nitrile rubber preferably includes NV rubber-plastic alloy modified nitrile rubber.

[0062] In this invention, the diameter of the thermal insulation hose is preferably 18.8-19.8 mm, more preferably 19.0-19.6 mm, and even more preferably 19.2-19.4 mm.

[0063] In this invention, the wall thickness of the heat-insulating hose is preferably 1.5-2 mm, more preferably 1.6-1.9 mm, and even more preferably 1.7-1.8 mm.

[0064] In this invention, the insulating hose is preferably a low-temperature resistant insulating hose.

[0065] In this invention, the thickness of the porous insulation layer is preferably 0.3mm to 0.7mm, more preferably 0.35mm to 0.65mm, even more preferably 0.4mm to 0.6mm, and even more preferably 0.45mm to 0.55mm. The optimal thickness is 0.5mm.

[0066] In this invention, the diameter of the pores is preferably 0.1-0.2 mm, more preferably 0.12-0.18 mm, and even more preferably 0.14-0.16 mm.

[0067] In this invention, the insulating hose preferably includes an insulating hose for hydraulic hoses.

[0068] In this invention, the wall of the heat-insulating hose preferably has a skeleton layer.

[0069] In this invention, the material of the skeleton preferably includes one or more of steel wire, fiber and stainless steel, and more preferably steel wire, fiber or stainless steel.

[0070] In this invention, the thermal insulation hose is preferably obtained by foaming and vulcanizing rubber material.

[0071] In this invention, the porous insulation layer is preferably formed during the foaming process.

[0072] In this invention, the heat insulation layer with pores is preferably an integral structure with the pipe wall, rather than a composite structure.

[0073] In this invention, the tube wall preferably has a bubble structure.

[0074] In this invention, the diameter of the bubble is preferably 0.1 to 0.2 mm, more preferably 0.12 to 0.18 mm, and even more preferably 0.14 to 0.16 mm.

[0075] This invention provides a thermal insulation hose, comprising, by weight of raw materials:

[0076] 60-70 parts by weight of NBR (nitrile butadiene rubber);

[0077] NV rubber-plastic alloy 30-40 parts by weight;

[0078] 3-5 parts by weight of zinc oxide;

[0079] Stearic acid 1 to 1.5 parts by weight;

[0080] 2-3 parts by weight of coumarone resin;

[0081] Antioxidant 0.5 to 1.5 parts by weight;

[0082] Dispersant 1 to 1.5 parts by weight;

[0083] 70-100 parts by weight of carbon black;

[0084] 10-20 parts by weight of light calcium carbonate;

[0085] 7-10 parts by weight of dioctyl sebacate;

[0086] 1-3 parts by weight of 4,4'-oxobisbenzenesulfonylhydrazine;

[0087] 1-3 parts by weight of azodicarbonamide;

[0088] Sulfur, 1-2.5 parts by weight;

[0089] Accelerator: 0.5 to 3.5 parts by weight.

[0090] In this invention, the amount of NBR nitrile rubber added is 60-70 parts by weight, which can be 62-68 parts by weight, preferably 64-66 parts by weight.

[0091] In this invention, the amount of NV rubber-plastic alloy added is 30-40 parts by weight, which can be 32-38 parts by weight, preferably 34-36 parts by weight.

[0092] In this invention, the amount of zinc oxide added is 3 to 5 parts by weight, which can be 3.4 to 4.6 parts by weight, preferably 3.8 to 4.2 parts by weight.

[0093] In this invention, the amount of stearic acid added is 1 to 1.5 parts by weight, which can be 1.1 to 1.4 parts by weight, preferably 1.2 to 1.3 parts by weight.

[0094] In this invention, the amount of coumarone resin added is 2 to 3 parts by weight, which can be 2.2 to 2.8 parts by weight, preferably 2.4 to 2.6 parts by weight.

[0095] In this invention, the amount of antioxidant added is 0.5 to 1.5 parts by weight, which can be 0.7 to 1.3 parts by weight, and preferably 0.9 to 1.1 parts by weight.

[0096] In this invention, the amount of the dispersant added is 1 to 1.5 parts by weight, which can be 1.1 to 1.4 parts by weight, and preferably 1.2 to 1.3 parts by weight.

[0097] In this invention, the amount of carbon black added is 70 to 100 parts by weight, which can be 75 to 95 parts by weight, and preferably 80 to 90 parts by weight.

[0098] In this invention, the amount of light calcium carbonate added is 10 to 20 parts by weight, which can be 12 to 18 parts by weight, and preferably 14 to 16 parts by weight.

[0099] In this invention, the amount of dioctyl sebacate added is 7 to 10 parts by weight, which can be 7.5 to 9.5 parts by weight, preferably 8 to 9 parts by weight.

[0100] In this invention, the amount of 4,4'-oxobisbenzenesulfonylhydrazine added is 1 to 3 parts by weight, which can be 1.4 to 2.6 parts by weight, preferably 1.8 to 2.2 parts by weight.

[0101] In this invention, the amount of azodicarbonamide added is 1 to 3 parts by weight, which can be 1.4 to 2.6 parts by weight, preferably 1.8 to 2.2 parts by weight.

[0102] In this invention, the amount of sulfur added is 1 to 2.5 parts by weight, which can be 1.3 to 2.2 parts by weight, and preferably 1.6 to 1.9 parts by weight.

[0103] In this invention, the amount of the accelerator added is 0.5 to 3.5 parts by weight, which can be 1 to 3 parts by weight, preferably 1.5 to 2.5 parts by weight.

[0104] In this invention, the NBR nitrile rubber preferably includes one or more of NBR 1965, NBR1042, NBR3370C and NBR3370, more preferably NBR1965, NBR1042, NBR3370C or NBR3370.

[0105] In this invention, the NV rubber-plastic alloy preferably includes one or more of NV5075, NV7030 and M58, more preferably NV5075, NV7030 or M58.

[0106] In this invention, the zinc oxide preferably comprises nano zinc oxide.

[0107] In this invention, the antioxidant preferably includes one or more of RD antioxidant, 4010NA antioxidant, BLE antioxidant and NBC antioxidant, more preferably RD antioxidant, 4010NA antioxidant, BLE antioxidant or NBC antioxidant.

[0108] In this invention, the dispersant preferably comprises a polymethacrylic acid derivative and / or a maleic anhydride copolymer, more preferably a polymethacrylic acid derivative or a maleic anhydride copolymer.

[0109] In this invention, the carbon black preferably includes one or more of carbon black N550, N330 and N660, and more preferably carbon black N550, N330 or N660.

[0110] In this invention, the accelerator preferably includes one or more of CZ accelerator, TT accelerator, DZ accelerator, accelerator HVA-2, and DTDM, and more preferably CZ accelerator, TT accelerator, DZ accelerator, accelerator HVA-2, and DTDM.

[0111] The materials used in this invention are noted below:

[0112] NBR (Nitrile Butadiene Rubber) is produced by emulsion polymerization of butadiene and acrylonitrile. It is primarily manufactured using low-temperature emulsion polymerization and exhibits excellent oil resistance, high abrasion resistance, good heat resistance, and strong adhesion. Its disadvantages include poor low-temperature resistance, poor ozone resistance, poor insulation performance, and slightly lower elasticity.

[0113] NV rubber-plastic alloy is a rubber-plastic blend made by co-precipitating latex and polyvinyl chloride emulsions, and adding appropriate antioxidants, heat stabilizers, and adhesives. Chemically, NV rubber combines the properties of neoprene rubber; physically, it exhibits high tensile strength and excellent abrasion resistance, significantly improving rubber processing techniques, increasing finished product yield, and reducing production costs.

[0114] ZnO nano zinc oxide. RD antioxidant, a homopolymer of 1,2-dihydro-2,2,4-trimethylquinoline. Dioctyl sebacate (DOS) is an excellent low-temperature plasticizer with very good cold resistance, very low volatility, and can be processed at higher temperatures. It has good electrical insulation, good light and weather resistance, but is prone to migration and is easily affected by hydrocarbons. SA stearic acid, also known as octadecanoic acid, has the molecular formula C2. 18 H36 O2, stearic acid plays an important role in the synthesis and processing of rubber. Stearic acid is a widely used vulcanizing activator in natural rubber, synthetic rubber, and latex, and can also be used as a plasticizer and softener. In the production of synthetic rubber, stearic acid is added as an emulsifier; in the manufacture of foamed rubber, stearic acid can act as a foaming agent; and stearic acid can also be used as a release agent for rubber products. 4,4'-Oxobis(benzenesulfonyl)hydrazine (OBSH), with the molecular formula C... 12 H 14 N4O5S2 is mainly used as a foaming agent in the rubber and plastics industries. Azodicarbonamide (AC) is a non-toxic, odorless, non-flammable compound that is soluble in alkalis but insoluble in gasoline, alcohols, benzene, pyridine, and water. Its molecular formula is C2H4O2N4. It can be used as a food additive and foaming agent.

[0115] This invention provides a method for preparing the thermal insulation hose according to any one of the above technical solutions, comprising the following steps:

[0116] 1) After mixing and pressing the raw materials, a rubber compound is obtained;

[0117] 2) The rubber compound and skeleton material obtained in the above steps are extruded and compounded to obtain a tubular matrix containing a skeleton and covered with an outer rubber layer.

[0118] 3) The matrix obtained in the above steps is heat-treated, foamed, and vulcanized to obtain the thermal insulation hose.

[0119] The present invention first mixes and presses the raw materials to obtain a rubber compound.

[0120] In this invention, the mixing and extrusion method preferably includes pressing with an open mill.

[0121] The present invention further combines the rubber material and skeleton material obtained in the above steps through extrusion to obtain a tubular matrix containing a skeleton and covered with an outer rubber layer.

[0122] The adhesive layer covering the skeleton in this invention is obtained by compounding through an extruder.

[0123] Finally, the substrate obtained in the above steps is subjected to heat treatment, foaming, and vulcanization to obtain the thermal insulation hose.

[0124] In this invention, the heat treatment foaming temperature is preferably 190–240°C, more preferably 200–230°C, and even more preferably 200–220°C. Specifically, it can be 200°C.

[0125] In this invention, the heat treatment foaming time is preferably 10-15 seconds, more preferably 10-13 seconds, and even more preferably 10-11 seconds. Specifically, it can be 10 seconds.

[0126] In this invention, the vulcanization temperature is preferably 148–155°C, more preferably 149–154°C, and even more preferably 151–152°C. Specifically, it can be 151°C.

[0127] In this invention, the vulcanization time is preferably 50-70 min, more preferably 54-66 min, and even more preferably 58-62 min. Specifically, it can be 60 min.

[0128] In this invention, the vulcanization pressure is preferably 0.4 to 0.5 MPa, more preferably 0.42 to 0.48 MPa, and even more preferably 0.44 to 0.46 MPa.

[0129] To complete and refine the overall technical solution and better ensure the performance of the thermal insulation hose, the aforementioned thermal insulation hose for hydraulic hoses and its preparation method can be specifically described as follows:

[0130] This foaming compound is prepared from raw materials in parts by weight:

[0131] NBR 1965, NV5075, ZnO, SA, coumarone, RD antioxidant, 4010NA antioxidant, dispersant, carbon black N55, light calcium carbonate, DOS, OBSH, AC, S, CZ accelerator and TT accelerator.

[0132] Process plan:

[0133] The woven (wound) skeleton layer is coated with an outer rubber layer in an extruder. After coating, it is placed in a high-temperature oven at 200°C for 10 seconds to form a dense heat-insulating pore sample layer on the surface. Then, the foamed rubber tube is vulcanized in a vulcanizing tank at 151°C / MPa for 60 minutes to finally obtain the heat-insulating rubber tube.

[0134] The foaming time in the above scheme is 10 seconds.

[0135] The present invention also provides the application of the thermal insulation hose described in any one of the above technical solutions or the thermal insulation hose prepared by the preparation method described in any one of the above technical solutions in the field of thermal insulation hoses for hydraulic hoses.

[0136] This invention provides an insulated rubber hose, its preparation method, and its application. The insulated rubber hose designed in this invention has a specific structure and composition. By adding two specific foaming materials, OBSH and AC, to the formula and further adjusting the preparation process, micropores are formed during vulcanization. This creates a low-heat-transfer insulation layer on the outer surface of the hose. Air movement within the bubbles is severely hindered, and the micropores in the rubber material act as "convective heat conductors," preventing heat transfer and providing excellent insulation, thus preventing the hose from freezing and cracking. This invention effectively avoids limitations in rubber material selection and multi-stage processing of the rubber material, improving production efficiency. The insulation effect is achieved through changes in the microstructure of the rubber material after vulcanization, making operation more convenient. The preparation process provided by this invention is simple, operates under mild conditions, and is highly controllable, making it more conducive to industrial promotion and application.

[0137] To further illustrate the present invention, the following detailed description of the thermal insulation hose, its preparation method, and its application is provided in conjunction with embodiments. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures. They are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0138] Example 1

[0139] NBR 1965:65

[0140] NV5075:36

[0141] ZnO: 3.5

[0142] SA:1.3

[0143] Gumarone: 2.5

[0144] RD Anti-aging Agent: 1

[0145] 4010NA antioxidant: 1

[0146] Dispersant: 1.2

[0147] Carbon Black N550: 85

[0148] Light calcium: 14

[0149] DOS:8

[0150] OBSH:2.0

[0151] AC: 1.8

[0152] S:1.8

[0153] CZ accelerator: 1.5%; TT accelerator: 1.5%

[0154] Test results: Foaming specific gravity 0.8, low temperature resistance -45℃.

[0155] Example 2

[0156] NBR 1965:66

[0157] NV5075:36

[0158] Zno: 4.2

[0159] SA:1.3

[0160] Gumarone: 2.5

[0161] RD Anti-aging Agent: 1

[0162] 4010NA antioxidant: 1

[0163] Dispersant: 1.3

[0164] Carbon Black N550: 85

[0165] Light calcium: 14

[0166] DOS:8

[0167] OBSH:2.0

[0168] AC: 2.0

[0169] S:1.8

[0170] CZ accelerator: 1.3%; TT accelerator: 2.0%.

[0171] Test results: Foaming specific gravity 0.4, low temperature resistance -50℃

[0172] Example 3

[0173] NBR 1965:65

[0174] NV5075:35

[0175] Zno: 4.2

[0176] SA:1.3

[0177] Gumarone: 2.5

[0178] RD Anti-aging Agent: 1

[0179] 4010NA antioxidant: 1.5

[0180] Dispersant: 1.3

[0181] Carbon Black N550: 86

[0182] Light calcium: 15

[0183] DOS:8

[0184] OBSH: 1.8

[0185] AC: 2.0

[0186] S:1.8

[0187] CZ accelerator: 1.3

[0188] TT accelerator: 1.5

[0189] Test results show a foaming specific gravity of 0.4 and low-temperature resistance of -60℃.

[0190] The experiment proved that the third option was more effective.

[0191] The performance of the thermal insulation hose prepared in Example 3 of the present invention was tested.

[0192] See Table 1, which is a comparison of the 24-hour performance of the thermal insulation hose prepared in Example 3 of the present invention at -40℃ and -60℃.

[0193] Table 1

[0194] Hardness (Shore A) Tensile strength MPA Elongation at break % Permanent deformation % -40℃*24h 72 8.5 365 15 -60℃*24h 73 8.3 350 13

[0195] The thermal insulation hose prepared in Example 3 of the present invention was subjected to aging resistance testing.

[0196] Ozone test: Ozone concentration 50PPM, 40℃, 72 hours, no cracks found in the finished product.

[0197] The above provides a detailed description of the thermal insulation hose, its preparation method, and its applications. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the wording of the claims, or if they include equivalent structural elements that are not substantially different from the wording of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A thermal insulation hose for hydraulic hoses, characterized in that, The thermal insulation hose is a modified nitrile rubber thermal insulation hose; The modified nitrile rubber includes NV rubber-plastic alloy modified nitrile rubber; The wall thickness of the thermal insulation hose is 1.5~2mm; The outer wall of the insulated hose has an insulation layer with air holes. The thickness of the porous insulation layer is 0.3mm to 0.7mm; The heat-insulating hose has a skeleton layer in its wall; The porous insulation layer is an integral structure with the pipe wall, and is not a composite structure. The thermal insulation hose, by weight of raw materials, comprises: 60-70 parts by weight of NBR (nitrile butadiene rubber); NV rubber-plastic alloy 30-40 parts by weight; 3-5 parts by weight of zinc oxide; Stearic acid 1-1.5 parts by weight; 2-3 parts by weight of coumarone resin; Antioxidant 0.5~1.5 parts by weight; Dispersant 1~1.5 parts by weight; 70-100 parts by weight of carbon black; 10-20 parts by weight of light calcium carbonate; 7-10 parts by weight of dioctyl sebacate; 1-3 parts by weight of 4,4'-oxobisbenzenesulfonylhydrazine; 1-3 parts by weight of azodicarbonamide; Sulfur 1-2.5 parts by weight; Accelerator: 0.5-3.5 parts by weight.

2. The thermal insulation hose according to claim 1, characterized in that, The diameter of the thermal insulation hose is 18.8~19.8mm; The insulating hose is a low-temperature resistant insulating hose.

3. The thermal insulation hose according to claim 1, characterized in that, The diameter of the pores is 0.1~0.2mm.

4. The thermal insulation hose according to claim 1, characterized in that, The skeleton is made of one or more of steel wire, fiber, and stainless steel. The thermal insulation hose is obtained by foaming and vulcanizing rubber material.

5. The thermal insulation hose according to claim 4, characterized in that, The porous insulation layer is formed during the foaming process; The tube wall has a bubble structure; The diameter of the bubble is 0.1~0.2mm.

6. The thermal insulation hose according to claim 1, characterized in that, The NBR nitrile rubber includes one or more of NBR 1965, NBR1042 and NBR3370C; The NV rubber-plastic alloy includes one or more of NV5075, NV7030 and M58; The zinc oxide includes nano zinc oxide.

7. The thermal insulation hose according to claim 1, characterized in that, The antioxidant includes one or more of RD antioxidant, 4010NA antioxidant, BLE antioxidant, and NBC antioxidant; The dispersant includes polymethacrylic acid derivatives and / or maleic anhydride copolymers; The carbon black includes one or more of carbon black N550, N330 and N660; The accelerator is one or more of the following: CZ accelerator, TT accelerator, DZ accelerator, HVA-2 accelerator, and DTDM.

8. A method for preparing a thermal insulation hose as described in any one of claims 1 to 7, characterized in that, Includes the following steps: 1) After mixing and pressing the raw materials, a rubber compound is obtained; 2) The rubber compound and skeleton material obtained in the above steps are extruded and compounded to obtain a tubular matrix containing a skeleton and covered with an outer rubber layer. 3) The matrix obtained in the above steps is heat-treated, foamed, and vulcanized to obtain the thermal insulation hose.

9. The preparation method according to claim 8, characterized in that, The mixing and extrusion method includes pressing with an open mill; The heat treatment foaming temperature is 190~240℃; The heat treatment foaming time is 10~15 seconds; The vulcanization temperature is 148~155℃; The vulcanization time is 50-70 minutes; The vulcanization pressure is 0.4~0.5 MPa.

10. The application of the thermal insulation hose according to any one of claims 1 to 7 or the thermal insulation hose prepared by the preparation method according to any one of claims 8 to 9 in the field of thermal insulation hoses for hydraulic hoses.