Marine oil-resistant ship mooring rope

Abstract

The invention discloses a marine oil-resistant ship mooring rope. The ship mooring rope is composed of plied yarns and is of a one-layer or more-layer structure, and the outermost plied yarns of the ship mooring rope are oil-resistant plied yarns; the oil-resistant plied yarns are made of oil-resistant fibers; the oil-resistant fibers are obtained by melting and spinning oil-resistant fiber raw materials; the oil-resistant fiber is prepared from the following raw materials in parts by weight: 100 parts of polyethylene slices, 1-3 parts of an oil-resistant material, 0.1-0.5 part of an antioxidant and 0-0.2 part of maleic anhydride grafted polyethylene; the oil-resistant material comprises an acyloxy nitrile compound with a benzene ring and an acyloxy nitrile compound without a benzene ring. The oil-resistant ship cable is prepared by mixing an acyloxy nitrile compound 2-acetoxybenzonitrile with a benzene ring and an acyloxy nitrile compound 3-acetoxypropionitrile without a benzene ring according to the ratio of 1: 4 and adding the mixture into polyethylene, so that the oil resistance of the cable can be greatly improved, the use of a compatilizer can be reduced or the compatilizer is not added, and the oil resistance of the cable is improved. And the strength of the cable is not influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship cables, and in particular to a marine oil pollution resistant ship cable. Background Art

[0002] Ship cables are used on ships and can be categorized into various types, including dock mooring cables, buoy mooring cables, and anchorage mooring cables, depending on their intended use and environment. Ship cables are primarily categorized by material as either steel wire rope or synthetic fiber rope. While steel wire rope is often used for towing and tugboats, which require strong pulling force, synthetic fiber rope is generally used for docking and other onboard operations.

[0003] Synthetic fiber ropes are generally made from a variety of materials, including polyethylene, polypropylene, polyester, and polyamide. Depending on their operating environment, ship cables must possess properties such as high strength, abrasion resistance, acid and alkali resistance, salt spray resistance, and flame retardancy. Therefore, the fibers must be given corresponding properties. The complex operating environment aboard ships and the regular maintenance required often lead to unavoidable oil contamination. This is particularly true on oil tankers, where oil contamination of cables is unavoidable. Oil contamination can shorten the service life of cables and reduce their strength and abrasion resistance. Polyethylene cables, in particular, have poor oil resistance. Long-term contact with oil and grease can cause low-molecular-weight polyethylene fibers to swell, soften, and even degrade. Polyethylene cables are the most commonly used type of synthetic fiber cable for ships, so they must exhibit oil resistance. However, while research on the oil resistance of cable sheaths has been extensive, research on the oil resistance of ship cables is relatively limited. This is because cable sheaths are typically made from rubber, and rubber materials such as chloroprene rubber and nitrile rubber contain polar groups, making them susceptible to the addition of polar materials, and compatibility issues are less common. However, due to compatibility issues, it is difficult to add oil-resistant polar materials to ship cables, especially polyethylene. Therefore, it is necessary to develop a marine oil-resistant ship cable that is not only resistant to oil pollution but also has good compatibility with polyethylene without affecting the strength and other properties of the polyethylene cable. Summary of the Invention

[0004] In response to the above-mentioned prior art, the present invention aims to provide an oil-resistant marine cable. This invention prepares an oil-resistant cable by mixing 2-acetoxybenzonitrile, an acyloxynitrile compound with a benzene ring, and 3-acetoxypropionitrile, an acyloxynitrile compound without a benzene ring, in a mass ratio of 1:4 and adding the mixture to polyethylene. This mixture significantly improves the cable's oil resistance while reducing or eliminating the need for compatibilizers, without compatibilizing the cable's strength.

[0005] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a marine oil-resistant ship cable, the ship cable comprising a stranded yarn having one or more layers, wherein the outermost stranded yarn of the ship cable is an oil-resistant stranded yarn; the oil-resistant stranded yarn is made of oil-resistant fiber; and the oil-resistant fiber is obtained by melt spinning an oil-resistant fiber raw material. The oil-resistant fiber raw materials include the following raw materials in parts by weight: 100 parts of polyethylene chips, 1-3 parts of oil-resistant material, 0.1-0.5 parts of antioxidant, 0-0.2 parts of maleic anhydride grafted polyethylene; The oil-resistant material includes an acyloxynitrile compound with a benzene ring and an acyloxynitrile compound without a benzene ring.

[0006] Preferably, the material of the polyethylene slice is low-density polyethylene.

[0007] Preferably, the mass ratio of the acyloxy nitrile compound with a benzene ring to the acyloxy nitrile compound without a benzene ring is 1:3-5.

[0008] Preferably, the acyloxynitrile compound with a benzene ring is 2-acetoxybenzonitrile; and the acyloxynitrile compound without a benzene ring is 3-acetoxypropionitrile.

[0009] Preferably, the antioxidant is antioxidant 1010.

[0010] Preferably, the twine is a twisted rope or a braided rope.

[0011] Preferably, the oil-resistant fiber is prepared by the following method: (1) granulating low-density polyethylene chips, oil-resistant material, antioxidant and maleic anhydride grafted polyethylene in a granulator to obtain oil-resistant fiber raw material; (2) The oil-resistant fiber raw material is melted by a twin-screw extruder, melt-extruded through a spinneret, air-cooled and solidified, and the oil-resistant fiber is obtained by spinning.

[0012] Preferably, the temperature of the melt extrusion is 140-160°C.

[0013] Preferably, the preparation method of the ship cable is: (1) The oil-resistant twine is made into oil-resistant twisted rope or oil-resistant braided rope by a twisting machine or a braiding machine; (2) Arrange the oil-resistant twisted rope or oil-resistant braided rope on the outermost layer and combine them to form a ship rope.

[0014] The second aspect of the present invention provides the use of a marine oil pollution resistant ship cable in oil pollution resistance.

[0015] Beneficial effects of the present invention: (1) The present invention prepares an oil-resistant ship cable by mixing an acyloxynitrile compound 2-acetoxybenzonitrile with a benzene ring and an acyloxynitrile compound 3-acetoxypropionitrile without a benzene ring in a mass ratio of 1:4 and adding the mixture to polyethylene. This not only greatly improves the oil resistance of the cable, but also reduces the use of a compatibilizer or eliminates the need to add a compatibilizer, and does not affect the strength of the cable.

[0016] (2) The preparation method of the present invention is simple and can produce oil-resistant fibers in one step. After the oil-resistant fibers are made into a twine rope, they are placed on the outermost layer of a ship's cable to protect the inner layer from oil contamination without affecting the cable's strength. Depending on the conditions of use, twine ropes made of other materials or with other functions can be placed on the inner layer, allowing it to be used in a variety of ship operation scenarios. DETAILED DESCRIPTION

[0017] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0018] As mentioned in the background section, polyethylene fibers readily absorb oil and grease, which can cause fiber swelling and softening. Long-term exposure can lead to hydrolytic degradation. Polyethylene cables are the most commonly used type of synthetic fiber cable for ships, so they must be resistant to oil stains. However, while much research has been conducted on the oil resistance of cable sheaths, little has been done on the oil resistance of ship cables.

[0019] Based on this, the purpose of the present invention is to provide a marine oil-resistant ship cable. Compounds with cyano and chlorine atoms have good oil resistance, such as nitrile rubber, chloroprene rubber, etc. However, the cable is made of synthetic fibers and is not suitable for adding oil-resistant rubber. The inventors found through research on compounds containing cyano and chlorine atoms that acyloxynitrile compounds can be used to improve the oil resistance of polyethylene fibers; however, this will affect the mechanical properties of polyethylene. Therefore, through repeated experiments, it was found that adding a small amount of acyloxynitrile compounds with benzene rings and adding them in a mass ratio of 1:4 with acyloxynitrile compounds without benzene rings not only greatly improved the oil resistance of polyethylene fibers with a small amount of use, but also maintained the strength of polyethylene without using a compatibilizer or with a small amount of compatibilizer.

[0020] The structural formula of 2-acetoxybenzonitrile is ; The structural formula of 3-acetoxypropionitrile is .

[0021] Research has revealed that while both are polar materials with poor compatibility with polyethylene, their acyloxy groups may enhance their compatibility with polyethylene. The improved oil resistance is attributed to the nitrile groups in these two compounds. The addition of some acyloxynitrile compounds with benzene rings can maintain the mechanical strength of polyethylene. This allows for the production of oil-resistant fibers in a single step. This fiber, after being made into a twisted rope, can be placed as the outermost layer of a ship's cable, protecting the inner layer from oil contamination without compromising cable strength.

[0022] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below with reference to specific embodiments.

[0023] Note: Maleic anhydride grafted polyethylene was purchased from Dongguan Shangyi Plastic Co., Ltd. The LDPE model is LG FB3000.

[0024] The test materials used in the examples of the present invention are all conventional test materials in the art and can be purchased through commercial channels.

[0025] Example 1: Preparation of oil-resistant ship rope 100 kg of low-density polyethylene chips (LDPE), 1 kg of 3-acetoxypropionitrile (CAS No. 5325-93-9), 0.25 kg of 2-acetoxybenzonitrile (CAS No. 5715-05-6), and 0.3 kg of antioxidant 1010 were granulated in a granulator to obtain an oil-resistant fiber raw material.

[0026] The oil-resistant fiber raw material is added to a twin-screw extruder with a melting temperature of 150°C. The extrudate is melt-extruded through a spinneret with an aperture of 1.2 mm. The ejected salt-resistant fiber filaments are solidified by air cooling (air cooling temperature 20°C, wind speed 1.5 m / s), enter the spinning tunnel, are oiled and entangled, and stretched by a hot roller (70~90°C). The oil-resistant fiber is then wound on a winder to obtain the oil-resistant fiber.

[0027] Twisting two strands of oil-resistant fiber makes an oil-resistant ship rope.

[0028] Example 2: Preparation of oil-resistant ship rope The difference from Example 1 is that 0.1 g of maleic anhydride grafted polyethylene (PE-g-MA) is added.

[0029] The result is an oil-resistant ship rope.

[0030] Comparative Example 1 The difference from Example 1 is that 3-acetoxypropionitrile and 2-acetoxybenzonitrile are not added. Finally, an oil-resistant ship rope is obtained.

[0031] Comparative Example 2 The difference from Example 1 is that 2-acetoxybenzonitrile was not added, but 1.25 kg of 3-acetoxypropionitrile was added. Finally, an oil-resistant ship rope was obtained.

[0032] Comparative Example 3 The difference from Example 1 is that 3-acetoxypropionitrile is not added, but 1.25 kg of 2-acetoxybenzonitrile is added. Finally, an oil-resistant ship rope is obtained.

[0033] Comparative Example 4 The difference from Example 1 is that the mass ratio of 3-acetoxypropionitrile to 2-acetoxybenzonitrile is 1:1. Finally, an oil-resistant ship rope is obtained.

[0034] Comparative Example 5 The difference from Example 1 is that the mass ratio of 3-acetoxypropionitrile to 2-acetoxybenzonitrile is 2:1. Finally, an oil-resistant ship rope is obtained.

[0035] Comparative Example 6 The difference from Example 1 is that 3-acetoxypropionitrile and 2-acetoxybenzonitrile are replaced with equal amounts of chlorinated polyethylene, thereby obtaining an oil-resistant ship rope.

[0036] Comparative Example 7 The difference from Example 1 is that 3-acetoxypropionitrile and 2-acetoxybenzonitrile are replaced with equal amounts of acrylonitrile, thereby obtaining an oil-resistant ship rope.

[0037] The cables from Examples 1-2 and Comparative Examples 1-7 were subjected to a tensile strength test and then treated with IPM902 oil at 90°C for 7 days as an oil resistance test. After the oil resistance test, the cables were tested for tensile strength. The oil resistance performance was determined based on the change in tensile strength before and after the oil resistance test. Each group was repeated five times and the average value was taken. The results are shown in Table 1.

[0038] Tensile strength change rate = (tensile strength before oil resistance - tensile strength after oil resistance) / tensile strength before oil resistance × 100%.

[0039] Table 1 Oil resistance Table 1 shows that, compared to Example 1, the addition of maleic anhydride-grafted polyethylene in Example 2 not only increases tensile strength but also reduces the rate of change in tensile strength before and after oil resistance, demonstrating that the addition of a compatibilizer helps improve the oil resistance of the cable. Compared to Comparative Example 1, which lacks the salt-resistant material, the tensile strength of Example 2 is closer to that of Comparative Example 1, demonstrating that the addition of maleic anhydride-grafted polyethylene maintains the mechanical properties of polyethylene.

[0040] Although Comparative Example 1 has the highest tensile strength, the change rate before and after oil resistance is too large, and it can no longer be used after oil resistance.

[0041] Comparative Example 2 only added 3-acetoxypropionitrile. Although the oil resistance was good, the tensile strength of the cable decreased by 10% compared with Example 1, and the mechanical properties were poor.

[0042] Comparative Example 3 only added 2-acetoxybenzonitrile. Although the cable strength was higher, the oil resistance was reduced by nearly half compared with Comparative Example 1.

[0043] Comparative Examples 4 and 5 have different mass ratios of 3-acetoxypropionitrile to 2-acetoxybenzonitrile. However, it can be seen that although Comparative Examples 4 and 5 have slightly higher tensile strengths than Example 1, their oil resistance is inferior to that of Example 1. Considering both tensile strength and oil resistance, the cable of Example 1 performs better.

[0044] Different oil-resistant materials were added to Comparative Examples 6 and 7, respectively. It can be seen that the chlorinated polyethylene added in Comparative Example 6 and the acrylonitrile added in Comparative Example 7 are both polar materials with poor compatibility with polyethylene. The two materials are basically not integrated into the polyethylene, and the oil resistance of the polyethylene is basically not improved, but the mechanical properties are slightly reduced.

[0045] In summary, Examples 1 and 2 not only maintain the tensile strength of polyethylene, but also have excellent oil resistance.

[0046] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A marine oil pollution resistant ship cable, characterized in that: The ship cable is composed of a stranded wire and has a structure of one or more layers, wherein the outermost stranded wire of the ship cable is an oil-resistant stranded wire; the oil-resistant stranded wire is made of oil-resistant fiber; and the oil-resistant fiber is obtained by melt spinning an oil-resistant fiber raw material; The oil-resistant fiber raw materials include the following raw materials in parts by weight: 100 parts of polyethylene chips, 1-3 parts of oil-resistant material, 0.1-0.5 parts of antioxidant, 0-0.2 parts of maleic anhydride grafted polyethylene; The oil-resistant material includes an acyloxynitrile compound with a benzene ring and an acyloxynitrile compound without a benzene ring.

2. The marine oil pollution resistant ship cable according to claim 1, characterized in that: The material of the polyethylene slice is low-density polyethylene.

3. The marine oil pollution resistant ship cable according to claim 1, characterized in that: The mass ratio of the acyloxy nitrile compound with a benzene ring to the acyloxy nitrile compound without a benzene ring is 1:3-5.

4. The marine oil pollution resistant ship cable according to claim 1, characterized in that: The acyloxynitrile compound with a benzene ring is 2-acetoxybenzonitrile; the acyloxynitrile compound without a benzene ring is 3-acetoxypropionitrile.

5. The marine oil pollution resistant ship cable according to claim 1, characterized in that: The antioxidant is antioxidant 1010.

6. The marine oil pollution resistant ship cable according to claim 1, characterized in that: The twine is a twisted rope or a braided rope.

7. The marine oil pollution resistant ship cable according to claim 1, characterized in that: The oil-resistant fiber is prepared by the following method: (1) granulating low-density polyethylene chips, oil-resistant material, antioxidant and maleic anhydride grafted polyethylene in a granulator to obtain oil-resistant fiber raw material; (2) The oil-resistant fiber raw material is melted by a twin-screw extruder, melt-extruded through a spinneret, air-cooled and solidified, and the oil-resistant fiber is obtained by spinning.

8. The marine oil pollution resistant ship cable according to claim 7, characterized in that: The temperature of the melt extrusion is 140-160°C.

9. The marine oil pollution resistant ship cable according to claim 1, characterized in that: The preparation method of the ship cable is as follows: (1) The oil-resistant twine is made into oil-resistant twisted rope or oil-resistant braided rope by a twisting machine or a braiding machine; (2) Arrange the oil-resistant twisted rope or oil-resistant braided rope on the outermost layer and combine them to form a ship rope.

10. Use of the marine oil pollution resistant ship cable according to any one of claims 1 to 9 in oil pollution resistance.

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