Ocean engineering hose and preparation method thereof

Abstract

The invention provides a hose for ocean engineering and a preparation method thereof, and belongs to the technical field of medium conveying hoses, the hose for ocean engineering is prepared by wrapping an inner layer structure with an outer wrapping layer, and the outer wrapping layer is prepared by continuously extruding a polyethylene composite reinforcing material; the polyethylene composite reinforced material is prepared from high-density polyethylene, modified glass fibers, maleic anhydride grafted polypropylene wax and an antioxidant, and the modified glass fibers are prepared from functional boron nitride filled chopped glass fibers. The outer coating layer of the hose for ocean engineering is high in waterproof capacity and good in high temperature resistance and seawater corrosion resistance, mechanical property reduction caused by volume swelling and insufficient corrosion resistance can be effectively avoided and reduced, the hose can be used for a long time in a high-temperature ocean environment, and the service life of the hose is greatly prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of medium conveying hoses, and particularly relates to a hose for ocean engineering and a preparation method thereof. Background Art

[0002] With the continuous development of deep-sea resources, the research and development and application of hoses for ocean engineering have very important strategic significance. Hoses for ocean engineering need to ensure the normal transportation of media such as oil and gas in the pipe, and the material properties also need to meet the relevant specification requirements to meet long-term use.

[0003] At present, non-bonded hoses are the mainstream structural form of hoses for ocean engineering, which can effectively combine stiffness and strength, and have the advantages of good flexibility, light weight, high strength and corrosion resistance. Non-bonded hoses mainly consist of several independent layers, including an inner lining layer, an armor layer, a wear-resistant layer and an outer coating layer, etc. There is no fixed connection between the layers, allowing relative displacement between the layers. The outer coating layer is made of a polymer material, and the function of the outer coating layer is to block external seawater and provide overall protection.

[0004] Due to characteristics such as wear resistance and non-scaling, polyethylene is commonly used as the base material for the outer coating layer of non-bonded hoses. In the prior art, the polyethylene outer coating layer of hoses for ocean engineering is prone to volume swelling under high-temperature conditions, with poor waterproof ability and insufficient corrosion resistance, resulting in a large reduction in the mechanical strength of the pipe material and affecting the service life of the hose. Summary of the Invention

[0005] To solve the problems in the background art, the present invention provides a hose for ocean engineering and a manufacturing method thereof. The outer coating layer of the manufactured hose has excellent high-temperature resistance and corrosion resistance, and finally realizes that the material has high mechanical properties and durability in a long-term high-temperature ocean environment.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A hose for ocean engineering is obtained by wrapping an inner layer structure with an outer coating layer. The outer coating layer is continuously extruded from a polyethylene composite reinforcing material. The polyethylene composite reinforcing material, by weight, comprises: 100 parts of high-density polyethylene, 6 - 10 parts of modified glass fiber, 4 - 6 parts of maleic anhydride grafted polypropylene wax, and 2 - 3 parts of antioxidant. The modified glass fiber is prepared from functionalized boron nitride-filled chopped glass fiber.

[0008] Further, the preparation of the modified glass fiber includes the following contents:

[0009] A1. Weigh 0.5 - 1 part of tetraethyl orthosilicate and 0.2 - 0.3 part of glycidoxypropyltrimethoxysilane by weight, add them to 25 - 35 parts of an ethanol solution with a concentration of 70 - 80%, mix evenly, and stir for 3 - 4 h to obtain a silica gel solution. Then soak 5 parts of boron nitride powder in the silica gel solution, evacuate, maintain for 30 - 60 min, filter, and dry in vacuum to obtain functionalized boron nitride.

[0010] A2. Add the functionalized boron nitride to 200 - 300 parts of polyvinylpyrrolidone to obtain a dispersion. Add 90 - 110 parts of chopped glass fibers to the dispersion, place it in a water bath at 60 - 70 °C, stir for 2 - 3 hours, filter, and dry to obtain modified glass fibers.

[0011] Furthermore, the preparation of maleic anhydride grafted polypropylene wax includes the following steps:

[0012] B1. Mix 6 - 10 parts of maleic anhydride, 0.4 - 0.6 part of diisopropylbenzene peroxide, and 3.5 - 4.5 parts of glycidyl methacrylate evenly to obtain a graft treatment solution for standby.

[0013] B2. Put 100 parts of polypropylene wax into a reaction kettle. Under nitrogen protection, heat the reaction kettle to 130 - 140 °C, put the graft treatment solution in step B1 into the reaction kettle containing polypropylene wax, stir evenly, raise the temperature of the reaction kettle to 150 - 170 °C, and stir for 3 - 5 h to obtain maleic anhydride grafted polypropylene wax.

[0014] Furthermore, the polyethylene composite reinforcing material is prepared by the following method:

[0015] S1. Mix high - density polyethylene, maleic anhydride grafted polypropylene wax, modified glass fibers, and antioxidant evenly to obtain a mixture.

[0016] S2. Feed the mixture in step S1 into a twin - screw extruder for melt extrusion, cooling, and pelletizing to obtain the polyethylene composite reinforcing material. The screw speed is 300 - 600 revolutions per minute, and the temperatures of the first to fifth sections of the twin - screw extruder are 160 - 180 °C, 190 - 200 °C, 190 - 200 °C, 180 - 190 °C, and 160 - 180 °C respectively.

[0017] Furthermore, the particle size of the boron nitride powder in step A1 is 1 - 10 μm.

[0018] Furthermore, the diameter of the chopped glass fibers in step A2 is 8 - 20 μm, and the length is 2 - 3 mm.

[0019] Furthermore, the antioxidant in step S1 is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168 with a mass ratio of 1:1.

[0020] The present application has the following beneficial effects:

[0021] 1. The hose for ocean engineering provided by the present invention has strong waterproof ability, good high-temperature resistance and seawater corrosion resistance. The used polyethylene outer coating material can effectively avoid and reduce the decline of mechanical properties caused by volume swelling and insufficient corrosion resistance, meet the long-term use in high-temperature ocean environments, and greatly extend the service life of the hose.

[0022] 2. The present invention attaches functionalized boron nitride to glass fibers. Taking the glass fibers as the overlapping skeleton, a uniform and continuous heat conduction network and a stable structural system are formed inside the composite material, improving the heat conduction performance and mechanical strength of the outer coating of the hose. The functionalization treatment of boron nitride can effectively avoid the aggregation of fillers, improve its dispersion ability, and at the same time can effectively improve the hydrophobic property of the material and enhance the corrosion resistance. Grafting maleic anhydride onto polyethylene wax can improve the compatibility between substances, enable the fillers to be evenly dispersed, avoid aggregation, and improve the heat conduction ability and hydrophobic property of the material. Thus, the outer coating of the hose has high high-temperature stability and corrosion resistance.

[0023] 3. The functionalization treatment of boron nitride endows boron nitride with many active groups such as hydroxyl groups and epoxy groups, which can bond with maleic anhydride grafted on polyethylene wax, improve the overall density and structural stability of the material, avoid and reduce the occurrence of swelling behavior, and further improve the durability of the material. Specific Embodiments

[0024] The following further elaborates on the present application in conjunction with embodiments.

[0025] The raw materials of the embodiments and comparative examples of the present application are all commercially available, unless otherwise specified.

[0026] Example 1

[0027] A hose for ocean engineering is prepared by wrapping an inner structure with an outer coating. The outer coating is continuously extruded from a polyethylene composite reinforcing material. The preparation of the polyethylene composite reinforcing material includes the following:

[0028] S1. Mix 100 parts of high-density polyethylene, 8 parts of modified glass fiber, 5 parts of maleic anhydride grafted polypropylene wax, and 2.5 parts of antioxidant evenly to obtain a mixture. The antioxidant is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168 with a mass ratio of 1:1;

[0029] S2. Feed the mixture in step S1 into a twin-screw extruder for melt extrusion, cooling, and pelletizing to obtain the polyethylene composite reinforcing material. The screw speed is 450 revolutions per minute, and the temperatures of the first to fifth sections of the twin-screw extruder are 167 °C, 195 °C, 195 °C, 185 °C, and 170 °C, respectively.

[0030] The preparation of the modified glass fiber includes the following:

[0031] A1. Weigh 0.8 parts of tetraethyl orthosilicate and 0.25 parts of glycidoxypropyltrimethoxysilane by weight, add them to 30 parts of an ethanol solution with a concentration of 75%, mix evenly, stir for 3.5 h to obtain a silica gel solution. Then soak 5 parts of boron nitride powder with a particle size of 1 - 10 μm in the silica gel solution, evacuate, hold for 30 min, filter, and dry in vacuum to obtain functionalized boron nitride.

[0032] A2. Add the functionalized boron nitride to 250 parts of polyvinylpyrrolidone to obtain a dispersion. Add 100 parts of chopped glass fibers with a diameter of 8 - 20 μm and a length of 2 - 3 mm to the dispersion, place it in a water bath at 65 °C, stir for 2.5 hours, filter, and dry to obtain the modified glass fiber;

[0033] The preparation of maleic anhydride grafted polypropylene wax includes the following:

[0034] B1. Mix 8 parts of maleic anhydride, 0.5 parts of diisopropylbenzene peroxide, and 4 parts of glycidyl methacrylate evenly to obtain a grafting treatment solution for standby;

[0035] B2. Put 100 parts of polypropylene wax into a reaction kettle. Under nitrogen protection, heat the reaction kettle to 135 °C, add the grafting treatment solution in step B1 into the reaction kettle containing polypropylene wax, stir evenly, raise the temperature of the reaction kettle to 160 °C, and stir for 4 h to obtain maleic anhydride grafted polypropylene wax.

[0036] Example 2

[0037] A marine engineering hose is prepared by wrapping an inner structure with an outer covering layer. The outer covering layer is continuously extruded from a polyethylene composite reinforcing material. The preparation of the polyethylene composite reinforcing material includes the following:

[0038] S1. Mix 100 parts of high-density polyethylene, 6 parts of modified glass fiber, 4 parts of maleic anhydride grafted polypropylene wax, and 2 parts of antioxidant, where the antioxidant is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168 with a mass ratio of 1:1;

[0039] S2. Feed the mixture in step S1 into a twin-screw extruder for melt extrusion, cooling, and pelletizing to obtain the polyethylene composite reinforcing material. The screw speed is 300 revolutions per minute, and the temperatures of the first to fifth sections of the twin-screw extruder are 160°C, 190°C, 190°C, 180°C, and 160°C respectively.

[0040] The preparation of the modified glass fiber includes the following:

[0041] A1. Weigh 0.5 parts of tetraethyl orthosilicate and 0.2 parts of glycidoxypropyltrimethoxysilane by weight, add them to 25 parts of an ethanol solution with a concentration of 70%, mix evenly, and stir for 3 h to obtain a silica gel solution. Then soak 5 parts of boron nitride powder with a particle size of 1 - 10 μm in the silica gel solution, evacuate, keep for 30 min, filter, and dry in vacuum to obtain functionalized boron nitride.

[0042] A2. Add the functionalized boron nitride to 200 parts of polyvinylpyrrolidone to obtain a dispersion. Add 90 parts of chopped glass fibers with a diameter of 8 - 20 μm and a length of 2 - 3 mm to the dispersion, place it in a 60°C water bath, stir for 2 hours, filter, and dry to obtain the modified glass fiber;

[0043] The preparation of maleic anhydride grafted polypropylene wax includes the following:

[0044] B1. Mix 6 parts of maleic anhydride, 0.4 parts of diisopropylbenzene peroxide, and 3.5 parts of glycidyl methacrylate evenly to obtain a grafting treatment solution for standby;

[0045] B2. Put 100 parts of polypropylene wax into a reaction kettle. Under nitrogen protection, heat the reaction kettle to 130°C, add the grafting treatment solution in step B1 into the reaction kettle containing polypropylene wax, stir evenly, raise the temperature of the reaction kettle to 170°C, and stir for 3 h to obtain maleic anhydride grafted polypropylene wax.

[0046] Example 3

[0047] A marine engineering hose is prepared by wrapping an inner structure with an outer coating layer. The outer coating layer is continuously extruded from a polyethylene composite reinforcing material. The preparation of the polyethylene composite reinforcing material includes the following:

[0048] S1. Mix 100 parts of high-density polyethylene, 10 parts of modified glass fiber, 6 parts of maleic anhydride grafted polypropylene wax, and 3 parts of antioxidant, where the antioxidant is a 1:1 mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168;

[0049] S2. Feed the mixture in step S1 into a twin-screw extruder for melt extrusion, cooling, and pelletizing to obtain the polyethylene composite reinforcing material. The screw speed is 600 revolutions per minute, and the temperatures of the first to fifth sections of the twin-screw extruder are 180°C, 200°C, 200°C, 190°C, and 180°C respectively.

[0050] The preparation of the modified glass fiber includes the following:

[0051] A1. Weigh 1 part of tetraethyl orthosilicate and 0.3 part of glycidoxypropyltrimethoxysilane by weight, add them to 35 parts of an 80% ethanol solution, mix evenly, stir for 4 h to obtain a silica gel solution. Then soak 5 parts of boron nitride powder with a particle size of 1 - 10 μm in the silica gel solution, evacuate, maintain for 60 min, filter, and dry in vacuum to obtain functionalized boron nitride.

[0052] A2. Add the functionalized boron nitride to 300 parts of polyvinylpyrrolidone to obtain a dispersion. Add 100 parts of chopped glass fibers with a diameter of 8 - 20 μm and a length of 2 - 3 mm to the dispersion, place it in a 70°C water bath, stir for 2 hours, filter, and dry to obtain the modified glass fiber;

[0053] The preparation of maleic anhydride grafted polypropylene wax includes the following:

[0054] B1. Mix 10 parts of maleic anhydride, 0.6 part of diisopropylbenzene peroxide, and 4.5 parts of glycidyl methacrylate evenly to obtain a grafting treatment solution for standby;

[0055] B2. Put 100 parts of polypropylene wax into a reaction kettle. Under nitrogen protection, heat the reaction kettle to 140°C. Add the grafting treatment solution in step S1 into the reaction kettle containing polypropylene wax, stir evenly, raise the temperature of the reaction kettle to 170°C, and stir for 3 h to obtain maleic anhydride grafted polypropylene wax.

[0056] Example 4

[0057] A marine engineering hose is prepared by wrapping an inner structure with an outer coating layer. The outer coating layer is continuously extruded from a polyethylene composite reinforcing material. The preparation of the polyethylene composite reinforcing material includes the following:

[0058] S1. Mix 100 parts of high-density polyethylene, 8 parts of modified glass fiber, 5 parts of maleic anhydride grafted polypropylene wax, and 2 parts of antioxidant, where the antioxidant is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168 with a mass ratio of 1:1;

[0059] S2. Feed the mixture in step S1 into a twin-screw extruder for melt extrusion, cooling, and pelletizing to obtain the polyethylene composite reinforcing material. The screw speed is 600 revolutions per minute, and the temperatures of the first to fifth sections of the twin-screw extruder are 180°C, 190°C, 200°C, 180°C, and 160°C respectively.

[0060] The preparation of the modified glass fiber includes the following:

[0061] A1. Weigh 0.5 parts of tetraethyl orthosilicate and 0.3 parts of glycidoxypropyltrimethoxysilane by weight, add them to 25 parts of an ethanol solution with a concentration of 70%, mix evenly, stir for 3 h to obtain a silica gel solution. Then soak 5 parts of boron nitride powder with a particle size of 1 - 10 μm in the silica gel solution, evacuate, maintain for 60 min, filter, and vacuum dry to obtain functionalized boron nitride.

[0062] A2. Add the functionalized boron nitride to 200 parts of polyvinylpyrrolidone to obtain a dispersion. Add 110 parts of chopped glass fibers with a diameter of 8 - 20 μm and a length of 2 - 3 mm to the dispersion, place it in a water bath at 60°C, stir for 3 hours, filter, and dry to obtain the modified glass fiber;

[0063] The preparation of maleic anhydride grafted polypropylene wax includes the following:

[0064] B1. Mix 10 parts of maleic anhydride, 0.4 parts of diisopropylbenzene peroxide, and 3.5 parts of glycidyl methacrylate evenly to obtain a grafting treatment solution for standby;

[0065] B2. Put 100 parts of polypropylene wax into a reaction kettle. Under nitrogen protection, heat the reaction kettle to 140°C, put the grafting treatment solution in step S1 into the reaction kettle containing polypropylene wax, stir evenly, raise the temperature of the reaction kettle to 170°C, and stir for 3 h to obtain maleic anhydride grafted polypropylene wax.

[0066] Example 5

[0067] A marine engineering hose is prepared by wrapping an inner structure with an outer coating layer. The outer coating layer is continuously extruded from a polyethylene composite reinforcing material. The preparation of the polyethylene composite reinforcing material includes the following:

[0068] S1. Mix 100 parts of high-density polyethylene, 10 parts of modified glass fiber, 4 parts of maleic anhydride grafted polypropylene wax, and 2 parts of antioxidant, where the antioxidant is a 1:1 mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168;

[0069] S2. Feed the mixture in step S1 into a twin-screw extruder for melt extrusion, cooling, and pelletizing to obtain the polyethylene composite reinforcing material. The screw speed is 300 revolutions per minute, and the temperatures of the first to fifth sections of the twin-screw extruder are 180°C, 190°C, 190°C, 190°C, and 170°C, respectively.

[0070] The preparation of the modified glass fiber includes the following:

[0071] A1. Weigh 1 part of tetraethyl orthosilicate and 0.2 part of glycidoxypropyltrimethoxysilane by weight, add them to 35 parts of an 80% ethanol solution, mix evenly, stir for 4 h to obtain a silica gel solution, then soak 5 parts of boron nitride powder with a particle size of 1 - 10 μm in the silica gel solution, evacuate, keep for 30 min, filter, and dry in vacuum to obtain functionalized boron nitride.

[0072] A2. Add the functionalized boron nitride to 200 parts of polyvinylpyrrolidone to obtain a dispersion. Add 100 parts of chopped glass fibers with a diameter of 8 - 20 μm and a length of 2 - 3 mm to the dispersion, place it in a 65°C water bath, stir for 3 hours, filter, and dry to obtain the modified glass fiber;

[0073] The preparation of maleic anhydride grafted polypropylene wax includes the following:

[0074] B1. Mix 8 parts of maleic anhydride, 0.5 part of diisopropylbenzene peroxide, and 3.5 parts of glycidyl methacrylate evenly to obtain a grafting treatment solution for standby;

[0075] B2. Put 100 parts of polypropylene wax into a reaction kettle. Under nitrogen protection, heat the reaction kettle to 130°C, add the grafting treatment solution in step S1 into the reaction kettle containing polypropylene wax, stir evenly, raise the temperature of the reaction kettle to 150°C, and stir for 5 h to obtain maleic anhydride grafted polypropylene wax.

[0076] Comparative Example 1

[0077] The difference between this comparative example and Example 1 is only that in the preparation of the polyethylene composite reinforcing material, maleic anhydride grafted polypropylene wax is replaced by polypropylene wax.

[0078] Comparative Example 2

[0079] The difference between this comparative example and Example 1 is only that in the preparation of the polyethylene composite reinforcing material, the chopped glass fibers are not modified, that is, the modified glass fiber is replaced by chopped glass fibers.

[0080] Comparative Example 3

[0081] The difference between this comparative example and Example 1 is only that in the preparation of the modified glass fiber, the functionalized boron nitride is replaced by boron nitride powder.

[0082] Comparative Example 4

[0083] The difference between this comparative example and Example 1 is only that in the preparation of the polyethylene composite reinforcing material, maleic anhydride grafted polypropylene wax is replaced by polypropylene wax, and at the same time, in the preparation of the modified glass fiber, functionalized boron nitride is replaced by boron nitride powder.

[0084] Effect verification

[0085] Specimens of the outer cladding materials in the examples and comparative examples were made, and tensile strength tests were carried out. The test standard: ASTM D638, the tensile speed was 50 mm / min. The initial tensile strength, the tensile strength and volume expansion rate after accelerated treatment with high-temperature seawater were detected respectively, and the tensile strength retention rate was calculated. Among them, the tensile strength retention rate = (initial tensile strength - tensile strength after treatment) / initial tensile strength * 100%. The process of accelerated treatment with high-temperature seawater: put each group of specimens into seawater at 50 °C and soak for 60 days. The specific results are shown in Table 1:

[0086] Table 1

[0087]

[0088]

[0089] Result analysis

[0090] By analyzing Examples 1-5 and Comparative Examples 1-4 and combining the data in Table 1, it can be seen that the outer cladding of the marine engineering hose provided by the present invention has good high-temperature resistance and seawater corrosion resistance, has a low volume expansion rate and a high tensile strength retention rate, can effectively avoid the erosion of high-temperature seawater, and reduce the mechanical property decline caused by insufficient volume swelling and corrosion resistance. The specific analysis is as follows:

[0091] It can be seen from Comparative Example 2 that the addition of functionalized boron nitride can significantly reduce the volume expansion of the material and greatly improve the tensile strength retention rate of the outer cladding of the hose, indicating that the filling of functionalized boron nitride in the chopped glass fiber can greatly improve the corrosion resistance of the outer cladding material in high-temperature seawater and improve the material durability;

[0092] By comprehensively analyzing Comparative Example 1, Comparative Example 3 and Comparative Example 4, it can be seen that grafting maleic anhydride onto polyethylene wax can improve the tensile strength retention rate of the outer cladding material, and functionalizing boron nitride can reduce the volume expansion rate of the outer cladding material and improve the tensile strength retention rate of the material, which can avoid and reduce the occurrence of swelling behavior and extend the service life of the material. At the same time, the two can work synergistically to further improve the tensile strength retention rate of the outer cladding material and improve the material durability.

[0093] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination manners.

[0094] In addition, any combinations can be made among various different embodiments of the present invention, as long as they do not violate the idea of the present invention, and they should also be regarded as the content disclosed by the present invention.

Claims

1. A marine engineering hose, comprising an inner layer structure and an outer coating layer, characterized in that: The outer coating layer is made of polyethylene composite reinforcement material, and the raw materials of the polyethylene composite reinforcement material include, by weight: 100 parts of high-density polyethylene, 6-10 parts of modified glass fiber, 4-6 parts of maleic anhydride grafted polypropylene wax and 2-3 parts of antioxidant, wherein the modified glass fiber is made of functionalized boron nitride filled short glass fiber.

2. The marine engineering hose according to claim 1, characterized in that: The preparation of modified glass fiber includes the following: A1. Weigh 0.5-1 parts of tetraethyl orthosilicate and 0.2-0.3 parts of glycidyloxypropyl trimethoxysilane by weight, add 25-35 parts of 70-80% ethanol solution, mix well, stir for 3-4 hours to obtain a silica gel solution, and then soak 5 parts of boron nitride powder in the silica gel solution, evacuate, keep for 30-60 minutes, filter, and vacuum dry to obtain functionalized boron nitride; A2. Add functionalized boron nitride to 200-300 parts of polyvinyl pyrrolidone to obtain a dispersion, add 90-110 parts of chopped glass fibers to the dispersion, put it in a 60-70°C water bath, stir for 2-3 hours, filter, and dry to obtain modified glass fibers.

3. The marine engineering hose according to claim 1, characterized in that: The preparation of maleic anhydride grafted polypropylene wax includes the following: B1. 6-10 parts of maleic anhydride, 0.4-0.6 parts of dicumyl peroxide and 3.5-4.5 parts of glycidyl methacrylate are mixed to obtain a grafting treatment solution for standby use; B2. Add 100 parts of polypropylene wax into a reactor, heat the reactor to 130-140°C under nitrogen protection, add the grafting treatment liquid in step B1 into the reactor containing polypropylene wax, stir evenly, increase the temperature of the reactor to 150-170°C, stir for 3-5h, and obtain maleic anhydride grafted polypropylene wax.

4. The marine engineering hose according to claim 1, characterized in that: The polyethylene composite reinforced material is prepared by the following method: S1. The high-density polyethylene, maleic anhydride grafted polypropylene wax, modified glass fiber and antioxidant are uniformly mixed to obtain a mixture; S2. Feed the mixed material in step S1 into a twin-screw extruder for melt extrusion, cooling and granulation to obtain the polyethylene composite reinforced material, wherein the screw speed is 300-600 rpm, and the temperatures of the first to fifth sections of the twin-screw extruder are 160-180°C, 190-200°C, 190-200°C, 180-190°C and 160-180°C, respectively.

5. The marine engineering hose according to claim 2, characterized in that: In step A1, the particle size of the boron nitride powder is 1-10 μm.

6. The marine engineering hose according to claim 2, characterized in that: The diameter of the chopped glass fibers in step A2 is 8-20 μm and the length is 2-3 mm.

7. The marine engineering hose according to claim 4, characterized in that: The antioxidant in step S1 is a mixture of hindered phenol antioxidant 1010 and phosphite antioxidant 168 in a mass ratio of 1:

1.

8. A method for preparing a marine engineering hose, used for preparing the marine engineering hose according to any one of claims 1 to 7, characterized in that: The marine engineering hose is prepared by wrapping an inner layer structure with an outer coating layer, and the outer coating layer is prepared by continuous extrusion of a polyethylene composite reinforced material.

Images