Rubber sheath material for oil platform drilling cable and preparation method of rubber sheath material

Abstract

The invention relates to the technical field of electric wires and cables, in particular to a rubber sheath material for an oil platform drilling cable and a preparation method of the rubber sheath material. The utilization rate of the raw materials on the basis of molecular structure characteristics in the preparation process is considered, the preparation steps are adjusted from the angle of cost loss, the angle of processing technology, potential interference, technical difficulties and the like, and the performance parameters of the prepared rubber sheath material are obtained through scientific and visual tests and data comparison. According to the present invention, the effectiveness and the innovation of the formula, the mass ratio and the preparation method are verified, the more effective solution is provided for the use of the cable in the petroleum drilling platform, the cable loss is reduced to a certain extent, the service life is prolonged, and the market value and the promotion prospect are large.

Description

Technical Field

[0001] The present invention relates to the technical field of wire and cable, and particularly to a rubber sheath material for oil platform drilling cables and a preparation method thereof. Background Art

[0002] Cables for oil platforms refer to wire and cable specifically designed for oil platforms and other offshore facilities, mainly used for power transmission and power supply of control systems. These cables have specific performance and design requirements to ensure reliable operation in harsh offshore environments.

[0003] Generally, a drilling platform needs to accumulate and lay dozens of kilometers of cables of various specifications. The cables on the drilling platform need to have a series of special requirements to cope with the harsh use environment. Its remarkable technical feature is that the cables need to have good heat resistance, softness and flex resistance, resistance to mineral oil and diesel, low temperature resistance, flame retardancy, low smoke and halogen-free properties, etc.

[0004] EVA, also known as ethylene-vinyl acetate copolymer, is copolymerized from ethylene and vinyl acetate. In EVA, the content of vinyl acetate is generally 5% - 40%, and the oil resistance of the EVA polymer increases with the increase of the vinyl acetate content.

[0005] In addition, diisodecyl phthalate has long branched chains, a large molecular weight and a high flash point, so it has good heat resistance. And diisodecyl phthalate is not restricted by the EU detection standard among phthalates, and is also considered an environmentally friendly plasticizer. By adding the environmentally friendly plasticizer diisodecyl phthalate with a high relative molecular weight, the rubber sheath material can have good heat aging performance.

[0006] However, in the current prior art, there is no technical solution that combines the above two characteristics to meet the preparation and application of the rubber sheath of the cables used in oil platforms.

[0007] For the above reasons, the present invention designs a rubber sheath material for oil platform drilling cables and a preparation method thereof. By using EVA as the matrix material, combining diisodecyl phthalate as the plasticizer, and formulating other ingredients, on the basis of achieving oil resistance, it has functions such as flame retardancy, low smoke and halogen-free, and softness, meeting the use purpose of the cables in oil drilling platforms. Summary of the Invention

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a rubber sheath material for oil platform drilling cables and a preparation method thereof. By using EVA as the matrix material, combining diisodecyl phthalate as the plasticizer, and formulating other ingredients, on the basis of achieving oil resistance, it has functions such as flame retardancy, low smoke and halogen-free, and softness, meeting the use purpose of the cables in oil drilling platforms.

[0009] To achieve the above object, the present invention provides a rubber sheath material for a drilling cable of an oil platform, comprising the following formula and parts by mass: 36 - 40 parts of base material one, 3 - 5 parts of base material two, 1 - 2 parts of vulcanizing agent, 0.1 - 0.5 parts of vulcanization accelerator, 0.5 - 0.8 parts of antioxidant, 0.5 - 0.8 parts of softening agent, 0.3 - 0.6 parts of dispersant, 1 - 2 parts of antioxidant, 15 - 20 parts of kaolin, 35 - 50 parts of aluminum hydroxide, 5 - 10 parts of flame retardant, 1 - 2 parts of carbon black, 3 - 8 parts of plasticizer, 1 - 1.5 parts of silane coupling agent; Base material one is ethylene - vinyl acetate copolymer, wherein the content of vinyl acetate is 40%, and the melt index of base material one is 3 g / 10 min; Base material two is ethylene - vinyl acetate copolymer, wherein the content of vinyl acetate is 28%, and the melt index of base material two is 4 g / 10 min; The plasticizer is one of plasticizer one, plasticizer two or plasticizer three. Plasticizer one is diisodecyl phthalate DIDP with a flash point of 232°C and a density of 0.97 g / cm 3 ; Plasticizer two is environmentally friendly dioctyl phthalate VOP with a flash point of 210°C, and plasticizer three is dioctyl sebacate DOS with a flash point of 215°C.

[0010] The vulcanizing agent is di - tert - butyl peroxy - isopropyl benzene, with a melting point of 43 - 48°C, a flash point of 113°C, and a density of 0.974 g / cm 3 .

[0011] The vulcanization accelerator is triallyl isocyanurate, with a density of 1.11 g / cm 3 , and a melting point of 26 - 28°C.

[0012] The antioxidant is 2,2,4 - trimethyl - 1,2 - dihydroquinoline polymer, the softening agent is zinc stearate; the dispersant is a mixture of fatty acid and isoparaffin wax; the antioxidant is lead oxide, with a density of 9.1 g / cm 3 ; The flame retardant is zinc borate; the carbon black is fast extrusion furnace black, with a heating loss ≤ 1.0% and an ash content ≤ 0.5%.

[0013] The silane coupling agent is γ - aminopropyltriethoxysilane, with a density of 0.942 g / cm 3 .

[0014] A preparation method of a rubber sheath material for a drilling cable of an oil platform, comprising the following steps: S1, weigh the masses of various formulations according to the formula and the requirements of parts by mass; S2, preheat the internal mixer to a certain initial temperature for heating the formulation; the initial temperature is 65 - 75°C because at this temperature condition, the EVA material starts to soften, making it easier to absorb other additives, and facilitating the internal mixing process and more uniform mixing. S3, preheat the rubber filter, with the screw temperature set at 80°C. Under this temperature condition, the EVA material has good flexibility and is easier to be transported by the screw, reducing the transmission power of the screw. The head temperature is set between 80 - 100°C. The higher head temperature compared to the screw temperature is to make the rubber compound have fluidity and be easier to pass through the screen, preventing excessive power loss caused by material accumulation. S4, put Base Material 1 and Base Material 2 into the internal mixer, lower the upper ram and mix for 2 minutes to turn the granular base materials into a rubber mass with a certain plasticity and flexibility, and at the same time prevent excessive shearing from damaging the molecular chain length structure of EVA. S5, sequentially put aluminum hydroxide, clay, antioxidant, softening agent, dispersant, antioxidant, flame retardant, carbon black, silane coupling agent, and plasticizer into the internal mixer, lower the upper ram, and start the internal mixer for mixing; set the mixing time to 5 - 10 minutes. At the same time, turn on the cooling circulation device according to the internal mixing temperature to avoid premature loss caused by volatilization of some raw materials due to excessive temperature, and to avoid the problem of aging and failure. The internal mixing temperature does not exceed 115°C. S6, after the internal mixing is completed, open the lower ram, discharge the rubber compound and convey it to the roller mill for thin-sheeting. In theory, the more times of thin-sheeting, the more uniform the component mixing. However, considering production economy and the heat generated during thin-sheeting may cause thermal aging of the rubber compound, to improve the mixing effect and ensure uniform dispersion of various additive components, the number of thin-sheeting times is 5 times. S7, cut a strip of rubber from the 2130 roller mill and convey it to the feed inlet of the rubber filter for rubber filtering. There is one 20-mesh and one 40-mesh filter screen at the head part of the rubber filter. The rubber compound first passes through the 20-mesh filter screen for preliminary filtration, and then through the 40-mesh filter screen to filter out the difficult-to-mix rubber masses remaining during the internal mixing process and the impurities existing in the raw materials. When the head discharges rubber normally, turn on the cutting machine to cut the rubber mass into pieces for transfer to the next process. S8, convey the rubber compound discharged from the cutting machine to the 1530 roller mill for mixing and sheeting. Apply a thin layer of talcum powder to the resulting rubber sheet to play an isolation role and prevent the rubber sheets from sticking. S9, place the prepared rubber sheet under natural conditions for more than 8 hours to recover fatigue and relax stress, reduce the shrinkage of the rubber compound, and better promote the uniform dispersion of the compounding agents. The processed rubber compound is recharged into the internal mixer, and a vulcanizing agent and a vulcanization accelerator are added. The upper plug is pressed down, and the internal mixer is started to conduct internal mixing. Since the vulcanization temperature of rubber is relatively low, the high temperature generated during the internal mixing and shearing process can easily cause premature vulcanization of the rubber. Considering the uniform mixing of the vulcanizing agent and the rubber compound, the internal mixing time is 2 minutes. S10, after the internal mixing is completed, the lower plug is opened, and the rubber compound is discharged and conveyed to the 2130 roll mill for 5 passes of thin passing to fully mix the vulcanizing agent and the rubber compound evenly. S11, a strip of rubber on the 2130 roll mill is cut out and conveyed to the 1530 roll mill for mixing and sheet making. S12, the rubber sheet after mixing and sheet making on the 1530 roll mill in S11 is sent to the Φ570 eight-roll cold sheet unit for cooling to prevent the residual heat from the accumulation from causing rubber vulcanization, and then a layer of talcum powder is coated on the surface of the rubber sheet to obtain the finished product. S13, the performance of the rubber finished product obtained in S12 is tested. A flat vulcanizer is used for specimen preparation. Before specimen preparation, a rheometer is used to measure the vulcanization curve of the rubber compound to determine the vulcanization conditions for specimen preparation.

[0015] Compared with the prior art, the present invention makes full use of the characteristics of ethylene-vinyl acetate copolymer and diisodecyl phthalate, so that the prepared rubber sheath material has the functions of flame retardancy, low smoke and halogen-free, and softness while achieving oil resistance, meeting the use purpose of the cable in the oil drilling platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the rheological curve of the rubber finished product obtained by the present invention.

[0017] Figure 2 It is a comparison chart of the strength and elongation change rates after aging of four embodiments of the present invention.

[0018] Figure 3 It is a comparison chart of the strength and elongation change rates after immersion in mineral oil of four embodiments of the present invention.

[0019] Figure 4 It is a comparison chart of the strength and elongation change rates after immersion in fuel oil of four embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] See Figures 1 to 4 , and the present invention will be further described in conjunction with the accompanying drawings.

[0021] 1. Embodiment 1: The present invention provides a rubber sheath material for oil platform drilling cables, including the following formula and its mass parts: 38 parts of base material 1, 5 parts of base material 2, 1.5 parts of vulcanizing agent, 0.4 parts of vulcanization accelerator, 0.7 parts of antioxidant, 0.7 parts of softening agent, 0.5 parts of dispersant, 1.5 parts of antioxidant, 15 parts of clay, 42 parts of aluminum hydroxide, 7 parts of flame retardant, 1 part of carbon black, 6 parts of plasticizer, 1.5 parts of silane coupling agent; Base material 1 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 40%, and the melt index of base material 1 is 3 g / 10 min; Base material 2 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 28%, and the melt index of base material 2 is 4 g / 10 min; The plasticizer is diisodecyl phthalate DIDP with a flash point of 232 °C and a density of 0.97 g / cm 3

[0022] The vulcanizing agent is di-tert-butyl peroxycumene, its melting point is between 43 and 48 °C, its flash point is 113 °C, and its density is 0.974 g / cm 3

[0023] The vulcanization accelerator is triallyl isocyanurate, its density is 1.11 g / cm 3 , and its melting point is between 26 and 28 °C.

[0024] The antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline polymer, the softening agent is zinc stearate; the dispersant is a mixture of fatty acid and isoparaffin wax; the antioxidant is lead oxide, and the density is 9.1 g / cm 3 ; the flame retardant is zinc borate; the carbon black is fast extrusion furnace black, its heating loss ≤ 1.0%, and its ash content ≤ 0.5%.

[0025] The silane coupling agent is γ-aminopropyltriethoxysilane, and its density is 0.942 g / cm 3

[0026] A preparation method of a rubber sheath material for an oil platform drilling cable, comprising the following steps: S1, weighing the mass of each formula according to the formula and its mass fraction requirements; S2, preheating the internal mixer to make it have a certain initial temperature and serving as heating for the formula; the initial temperature is 65 °C; S3, preheating the rubber filter, with the screw temperature set at 80 °C and the head temperature set at 80 °C; S4, putting base material 1 and base material 2 into the internal mixer, pressing down the upper ram and kneading for 2 min to make the granular base material into a rubber mass with a certain plasticity and softness, and at the same time preventing excessive shearing from damaging the molecular chain length structure of EVA; ​​​S5. Sequentially put aluminum hydroxide, clay, antioxidant, softening agent, dispersant, antioxidant, flame retardant, carbon black, silane coupling agent, and plasticizer into the internal mixer, press down the upper plug, and start the internal mixer for mixing; set the mixing time to 5 min. Meanwhile, turn on the cooling circulation device according to the mixing temperature to avoid premature loss caused by volatilization of some raw materials due to excessive temperature, and to avoid the problem of aging and failure. The mixing temperature does not exceed 115 °C. S6. After mixing is completed, open the lower plug, discharge the rubber compound and convey it to the roller mill for thin-sheeting to improve the mixing effect and ensure uniform dispersion of various additive components. The number of thin-sheeting times is 5 times. S7. Cut out a strip of rubber from the roller mill and convey it to the inlet of the rubber filter. There is one 20-mesh filter screen and one 40-mesh filter screen at the head of the rubber filter. The rubber compound is first preliminarily filtered through the 20-mesh filter screen and then through the 40-mesh filter screen to filter out the difficult-to-mix rubber lumps remaining during the mixing process and the impurities in the raw materials. When the head discharges rubber normally, turn on the cutting machine to divide the rubber lumps for transfer to the next process. S8. Convey the rubber compound discharged from the cutting machine to the roller mill for mixing and sheeting. Apply a thin layer of talcum powder to the resulting rubber sheet to play an isolation role and prevent the rubber sheets from sticking. S9. Place the prepared rubber sheet under natural conditions for more than 8 hours to restore fatigue and relax stress, reduce the shrinkage of the rubber compound, and better promote the uniform dispersion of the compounding agents. Put the treated rubber compound back into the internal mixer, add vulcanizing agent and vulcanization accelerator, press down the upper plug, and start the internal mixer to start mixing; the mixing time is 2 min. S10. After mixing is completed, open the lower plug, discharge the rubber compound and convey it to the roller mill for thin-sheeting 5 times to make the vulcanizing agent and the rubber compound fully mixed and uniform. S11. Cut out a strip of rubber from the roller mill and convey it to another roller mill for mixing and sheeting. S12. Send the rubber sheet after mixing and sheeting in S11 to the Φ570 eight-roller cold-sheeting unit for cooling to prevent rubber vulcanization caused by the accumulated residual heat, and then apply a layer of talcum powder on the surface of the rubber sheet to obtain the finished product. S13. Conduct performance tests on the rubber finished product obtained in S12. Use a flat vulcanizer for specimen preparation. Before specimen preparation, use a rheometer to measure the vulcanization curve of the rubber compound to determine the vulcanization conditions for specimen preparation.

[0027] 2. Example Two: The present invention provides a rubber sheath material for oil platform drilling cables, including the following formula and its parts by mass: 38.5 parts of Base Material 1, 4.5 parts of Base Material 2, 1.51 parts of vulcanizing agent, 0.34 parts of vulcanization accelerator, 0.65 parts of antioxidant, 0.65 parts of softening agent, 0.34 parts of dispersant, 1.5 parts of antioxidant, 17.4 parts of clay, 41 parts of aluminum hydroxide, 6 parts of flame retardant, 1.1 parts of carbon black, 4.5 parts of plasticizer, 1.3 parts of silane coupling agent; Base Material 1 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 40%, and the melt index of Base Material 1 is 3 g / 10 min; Base Material 2 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 28%, and the melt index of Base Material 2 is 4 g / 10 min; The plasticizer is diisodecyl phthalate DIDP with a flash point of 232 °C and a density of 0.97 g / cm 3

[0028] The vulcanizing agent is di-tert-butyl peroxy isopropyl benzene, its melting point is between 43 and 48 °C, its flash point is 113 °C, and its density is 0.974 g / cm 3

[0029] The vulcanization accelerator is triallyl isocyanurate, its density is 1.11 g / cm 3 and its melting point is between 26 and 28 °C.

[0030] The antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline polymer, the softening agent is zinc stearate; the dispersant is a mixture of fatty acid and isoparaffin wax; the antioxidant is lead oxide with a density of 9.1 g / cm 3 ; the flame retardant is zinc borate; the carbon black is fast extrusion furnace black, its heating loss ≤ 1.0%, and its ash content ≤ 0.5%.

[0031] The silane coupling agent is γ-aminopropyltriethoxysilane, its density is 0.942 g / cm 3

[0032] A preparation method of a rubber sheath material for an oil platform drilling cable, comprising the following steps: S1, weigh the mass of each formula according to the formula and its mass fraction requirements; S2, preheat the internal mixer to make it have a certain initial temperature and serve as heating for the formula; the initial temperature is 65-75 °C; S3, preheat the rubber filter, set the screw temperature at 80 °C and the head temperature at 85 °C; S4, put Base Material 1 and Base Material 2 into the internal mixer, press down the upper plug and knead for 2 min to make the granular base material become a rubber mass with a certain plasticity and softness, and at the same time prevent excessive shearing from damaging the molecular chain length structure of EVA; ​​​S5. Sequentially put aluminum hydroxide, clay, antioxidant, softener, dispersant, antioxidant, flame retardant, carbon black, silane coupling agent, and plasticizer into the internal mixer, press down the upper plug, and start the internal mixer for mixing; set the mixing time to 7 min; Meanwhile, turn on the cooling circulation device according to the mixing temperature to avoid premature loss caused by volatilization of some raw materials due to excessive temperature, and to avoid the problem of aging and failure. The mixing temperature does not exceed 115 °C; S6. After mixing is completed, open the lower plug, discharge the rubber compound, and convey it to the roller mill for thin passing to improve the mixing effect and ensure uniform dispersion of various added auxiliary agent components. The number of thin passing times is 5; S7. Cut out a strip of rubber from the roller mill and convey it to the inlet of the rubber filter. There is one 20-mesh and one 40-mesh filter screen at the head of the rubber filter. The rubber compound is first preliminarily filtered through the 20-mesh filter screen and then through the 40-mesh filter screen to filter out the difficult-to-mix rubber lumps remaining during the mixing process and the impurities existing in the raw materials. When the head normally discharges rubber, start the cutting machine to divide the rubber lumps for transfer to the next process; S8. Convey the rubber compound discharged from the cutting machine to the roller mill for mixing and sheet extrusion. Apply a thin layer of talcum powder to the rubber sheet coming out to play an isolation role to prevent the rubber sheets from sticking; S9. Place the prepared rubber sheet under natural conditions for more than 8 hours to restore fatigue and relax stress, reduce the shrinkage of the rubber compound, and better promote the uniform dispersion of the compounding agents; Put the treated rubber compound back into the internal mixer, add vulcanizing agent and vulcanization accelerator, press down the upper plug, and start the internal mixer to start mixing; the mixing time is 2 min; S10. After mixing is completed, open the lower plug, discharge the rubber compound, and convey it to the roller mill for thin passing 5 times to fully mix the vulcanizing agent with the rubber compound evenly; S11. Cut out a strip of rubber from the roller mill and convey it to another roller mill for mixing and sheet extrusion; S12. Send the rubber sheet after mixing and sheet extrusion in S11 to the Φ570 eight-roll cold sheet unit for cooling to prevent rubber vulcanization caused by the accumulated residual heat, and then apply a layer of talcum powder on the surface of the rubber sheet to obtain the finished product; S13. Conduct performance tests on the rubber finished product prepared in S12. Use a flat vulcanizer for specimen preparation. Before specimen preparation, use a rheometer to measure the vulcanization curve of the rubber compound to determine the vulcanization conditions for preparing specimens.

[0033] 3. Example Three: The present invention provides a rubber sheath material for an oil platform drilling cable, including the following formula and its mass parts: 38.5 parts of base material 1, 4.5 parts of base material 2, 1.51 parts of vulcanizing agent, 0.34 parts of vulcanization accelerator, 0.65 parts of antioxidant, 0.65 parts of softening agent, 0.34 parts of dispersant, 1.5 parts of antioxidant, 17.4 parts of clay, 42 parts of aluminum hydroxide, 6.5 parts of flame retardant, 1.1 parts of carbon black, 3.7 parts of plasticizer, 1.3 parts of silane coupling agent; Base material 1 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 40%, and the melt index of base material 1 is 3 g / 10 min; Base material 2 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 28%, and the melt index of base material 2 is 4 g / 10 min; The plasticizer is environment-friendly dioctyl phthalate VOP with a flash point of 210°C.

[0034] The vulcanizing agent is di-tert-butyl peroxide cumene, its melting point is between 43 and 48°C, its flash point is 113°C, and its density is 0.974 g / cm 3 。

[0035] The vulcanization accelerator is triallyl isocyanurate, its density is 1.11 g / cm 3 and its melting point is between 26 and 28°C.

[0036] The antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline polymer, the softening agent is zinc stearate; the dispersant is a mixture of fatty acid and isoparaffin wax; the antioxidant is lead oxide, and the density is 9.1 g / cm 3 ; the flame retardant is zinc borate; the carbon black is fast extrusion furnace black, its heating loss ≤ 1.0%, and its ash content ≤ 0.5%.

[0037] The silane coupling agent is γ-aminopropyltriethoxysilane, and its density is 0.942 g / cm 3 。

[0038] A preparation method of a rubber sheath material for an oil platform drilling cable, comprising the following steps: S1, weighing the mass of each formula according to the formula and its mass fraction requirements; S2, preheating the internal mixer to make it have a certain initial temperature and serving as heating for the formula; the initial temperature is 65 - 75°C; S3, preheating the rubber filter, setting the screw temperature at 80°C and the head temperature at 90°C; S4, putting base material 1 and base material 2 into the internal mixer, pressing down the upper plug and kneading for 2 min to make the granular base material into a plastic and flexible rubber mass, and at the same time preventing excessive shear from damaging the molecular chain length structure of EVA; S5. Sequentially feed aluminum hydroxide, clay, antioxidant, softener, dispersant, antioxidant, flame retardant, carbon black, silane coupling agent, and plasticizer into the internal mixer, press down the upper plug, and start the internal mixer for mixing; set the mixing time to 9 minutes. Meanwhile, turn on the cooling circulation device according to the mixing temperature to avoid premature loss caused by volatilization of some raw materials due to excessive temperature, and to avoid aging and failure problems. The mixing temperature does not exceed 115°C. S6. After mixing is completed, open the lower plug, discharge the rubber compound, and convey it to the roll mill for thin-sheeting to improve the mixing effect and ensure uniform dispersion of various additive components. The number of thin-sheeting times is 5 times. S7. Cut a strip of rubber from the roll mill and convey it to the inlet of the rubber filter. There is one 20-mesh and one 40-mesh filter screen at the head of the rubber filter. The rubber compound is first preliminarily filtered through the 20-mesh filter screen and then through the 40-mesh filter screen to filter out the difficult-to-mix rubber lumps remaining during the mixing process and the impurities in the raw materials. When the head discharges rubber normally, turn on the cutting machine to divide the rubber lumps for transfer to the next process. S8. Convey the rubber compound discharged from the cutting machine to the roll mill for mixing and sheeting. Apply a thin layer of talcum powder to the resulting rubber sheet to play an isolating role and prevent the rubber sheets from sticking. S9. Place the prepared rubber sheet under natural conditions for more than 8 hours to restore fatigue and relax stress, reduce the shrinkage of the rubber compound, and better promote the uniform dispersion of the compounding agents. Re-feed the treated rubber compound into the internal mixer, add vulcanizing agent and vulcanization accelerator, press down the upper plug, and start the internal mixer to start mixing; the mixing time is 2 minutes. S10. After mixing is completed, open the lower plug, discharge the rubber compound, and convey it to the roll mill for thin-sheeting 5 times to fully mix the vulcanizing agent with the rubber compound evenly. S11. Cut a strip of rubber from the roll mill and convey it to another roll mill for mixing and sheeting. S12. Send the rubber sheet after mixing and sheeting in S11 to the Φ570 eight-roll cold sheet unit for cooling to prevent rubber vulcanization caused by the accumulated residual heat, and then apply a layer of talcum powder on the surface of the rubber sheet to obtain the finished product. S13. Conduct performance tests on the rubber finished product obtained in S12. Use a flat vulcanizer to prepare specimens. Before specimen preparation, use a rheometer to measure the vulcanization curve of the rubber compound to determine the vulcanization conditions for specimen preparation.

[0039] 4. Example Four: The present invention provides a rubber sheath material for oil platform drilling cables, including the following formula and its mass parts: 38.5 parts of base material 1, 4.5 parts of base material 2, 1.51 parts of vulcanizing agent, 0.34 parts of vulcanization accelerator, 0.65 parts of antioxidant, 0.65 parts of softening agent, 0.34 parts of dispersant, 1.5 parts of antioxidant, 17.4 parts of clay, 42 parts of aluminum hydroxide, 6.5 parts of flame retardant, 1.1 parts of carbon black, 3.7 parts of plasticizer, 1.3 parts of silane coupling agent; Base material 1 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 40%, and the melt index of base material 1 is 3 g / 10 min; Base material 2 is ethylene-vinyl acetate copolymer, in which the content of vinyl acetate is 28%, and the melt index of base material 2 is 4 g / 10 min; The plasticizer is dioctyl sebacate DOS with a flash point of 215 °C.

[0040] The vulcanizing agent is di-tert-butyl peroxyisopropylbenzene, its melting point is between 43 and 48 °C, its flash point is 113 °C, and its density is 0.974 g / cm 3 。

[0041] The vulcanization accelerator is triallyl isocyanurate, its density is 1.11 g / cm 3 , and its melting point is between 26 and 28 °C.

[0042] The antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline polymer, the softening agent is zinc stearate; the dispersant is a mixture of fatty acid and isoparaffin wax; the antioxidant is lead oxide, and the density is 9.1 g / cm 3 ; the flame retardant is zinc borate; the carbon black is fast extrusion furnace black, its heating loss ≤ 1.0%, and its ash content ≤ 0.5%.

[0043] The silane coupling agent is γ-aminopropyltriethoxysilane, and its density is 0.942 g / cm 3 。

[0044] A preparation method of a rubber sheath material for an oil platform drilling cable includes the following steps: S1, weigh the quality of each formula according to the formula and its mass fraction requirements; S2, preheat the internal mixer to make it have a certain initial temperature, and it is used to heat the formula; the initial temperature is 65 - 75 °C; S3, preheat the rubber filter, set the screw temperature at 80 °C and the head temperature at 100 °C; S4, put base material 1 and base material 2 into the internal mixer, lower the upper ram and knead for 2 min to make the granular base material become a rubber mass with a certain plasticity and softness, and at the same time prevent excessive shearing from damaging the molecular chain length structure of EVA; S5. Sequentially feed aluminum hydroxide, clay, antioxidant, softener, dispersant, antioxidant, flame retardant, carbon black, silane coupling agent, and plasticizer into the internal mixer, lower the upper plug, and start the internal mixer for mixing; set the mixing time to 10 min; Meanwhile, turn on the cooling circulation device according to the mixing temperature to avoid premature loss caused by volatilization of some raw materials due to excessive temperature and to avoid aging and failure problems. The mixing temperature does not exceed 115 °C; S6. After mixing is completed, open the lower plug, discharge the rubber compound, and convey it to the roller mill for thin-sheeting to improve the mixing effect and ensure uniform dispersion of various additive components. The number of thin-sheeting times is 5 times; S7. Cut out a strip of rubber from the roller mill and convey it to the inlet of the rubber filter. There is one 20-mesh and one 40-mesh filter screen at the head of the rubber filter. The rubber compound is first preliminarily filtered through the 20-mesh filter screen and then through the 40-mesh filter screen to filter out the difficult-to-mix rubber lumps remaining during the mixing process and the impurities in the raw materials; start the cutting machine when the head discharges rubber normally to divide the rubber lumps for transfer to the next process; S8. Convey the rubber compound discharged by the cutting machine to the roller mill for mixing and sheeting. Apply a thin layer of talcum powder to the resulting rubber sheet to play an isolation role and prevent the rubber sheets from sticking; S9. Place the prepared rubber sheet under natural conditions for more than 8 hours to restore fatigue and relax stress, reduce the shrinkage of the rubber compound, and better promote the uniform dispersion of the compounding agents; Re-feed the treated rubber compound into the internal mixer, add vulcanizing agent and vulcanization accelerator, lower the upper plug, and start the internal mixer to start mixing; the mixing time is 2 min; S10. After mixing is completed, open the lower plug, discharge the rubber compound, and convey it to the roller mill for thin-sheeting 5 times to fully mix the vulcanizing agent with the rubber compound evenly; S11. Cut out a strip of rubber from the roller mill and convey it to another roller mill for mixing and sheeting; S12. Send the rubber sheet after mixing and sheeting in S11 to the Φ570 eight-roller cold sheet unit for cooling to prevent rubber vulcanization caused by the accumulated residual heat, and then apply a layer of talcum powder on the surface of the rubber sheet to obtain the finished product; S13. Conduct performance tests on the rubber finished product obtained in S12. Use a flat vulcanizer to prepare specimens. Before specimen preparation, use a rheometer to measure the vulcanization curve of the rubber compound to determine the vulcanization conditions for preparing specimens.

[0045] The test process of the present invention is as follows: 1. Set the temperature of the rheometer to 170 °C, the experimental time to 60 minutes, and start the equipment for preheating.

[0046] 2. After the temperature reaches the set temperature, take an appropriate amount of film and place it on the specimen stage, close the top column, and start the test.

[0047] 3. After the experiment, observe the rheological curve as Figure 1 shown. It can be seen from the curve that at 30 minutes, the curve gradually becomes stable, indicating that the rubber has basically completed the vulcanization reaction at this time, and the crosslinking degree of the molecular structure is relatively high. Therefore, the sample preparation conditions of the flat vulcanizer are set to 170 °C for 30 minutes.

[0048] 4. Take an appropriate amount of rubber compound and knead it on a two-roll mill to soften the rubber compound for easy molding. Cut an appropriate amount of rubber compound and place it in a mold and vulcanize it on a flat vulcanizer. The vulcanization temperature is 170 °C and the vulcanization time is 30 min. The test pieces obtained are subjected to performance tests, and the performance test results are shown in Table 1 below:

[0049] Combined with Table 1 above and Figures 2 to 4 it can be intuitively seen that the use effect of plasticizer three is poor and the aging performance is unqualified; when replaced with plasticizer two, although all indicators meet the requirements, the margin of performance indicators is low; while when using plasticizer one, the oil resistance indicators are all improved, and the aging performance and low-temperature performance are also better.

[0050] The above is only the preferred implementation mode of the present invention, which is only used to help understand the method and its core idea of the present application. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0051] The present invention overall addresses the deficiencies in the prior art regarding the underutilization of the chemical properties of ethylene-vinyl acetate copolymer and diisodecyl phthalate in cables for oil platforms. By setting a detailed preparation formula for the rubber sheath material used in drilling cables for oil platforms and a preparation method based thereon, research on the formula and preparation steps has been carried out, making full use of the oil resistance of ethylene-vinyl acetate copolymer and the heat and aging resistance of diisodecyl phthalate. Consideration has been given to the utilization rate based on the molecular structure characteristics of the raw materials during the preparation process, and the preparation steps have been adjusted from the perspectives of cost loss, processing technology, potential interference, technical difficulties, etc. Finally, through scientific and intuitive test and comparison data, the performance parameters of the prepared rubber sheath material have been obtained, verifying the effectiveness and innovation of the formula, its mass ratio, and the preparation method included in the present invention, providing a more effective solution for the use of cables in oil drilling platforms, reducing the loss of cables to a certain extent, increasing their service life, and having great market value and promotion prospects.

Claims

1. A rubber sheath material for oil platform drilling cables, characterized in that: Including the following formulas and their mass parts: 36-40 parts of base material 1, 3-5 parts of base material 2, 1-2 parts of vulcanizing agent, 0.1-0.5 parts of vulcanizing accelerator, 0.5-0.8 parts of antioxidant, 0.5-0.8 parts of softener, 0.3-0.6 parts of dispersant, 1-2 parts of antioxidant, 15-20 parts of clay, 35-50 parts of aluminum hydroxide, 5-10 parts of flame retardant, 1-2 parts of carbon black, 3-8 parts of plasticizer, 1-1.5 parts of silane coupling agent; The base material 1 is ethylene-vinyl acetate copolymer, wherein the content of vinyl acetate is 40%, and the melt index of the base material 1 is 3g / 10min; The base material 2 is ethylene-vinyl acetate copolymer, wherein the content of vinyl acetate is 28%, and the melt index of the base material 2 is 4g / 10min; The plasticizer is one of plasticizer 1, plasticizer 2 or plasticizer 3, and the plasticizer 1 has a flash point of 232°C and a density of 0.97 g / cm 3 The second plasticizer is diisodecyl phthalate DIDP; the second plasticizer is environmentally friendly dioctyl phthalate VOP with a flash point of 210°C, and the third plasticizer is dioctyl sebacate DOS with a flash point of 215°C.

2. The rubber sheath material for oil platform drilling cable according to claim 1, characterized in that: The vulcanizing agent is di-tert-butyl peroxide isopropylbenzene, which has a melting point of 43-48°C, a flash point of 113°C, and a density of 0.974 g / cm 3 .

3. The rubber sheath material for oil platform drilling cable according to claim 1, characterized in that: The vulcanizing agent is triallyl isocyanurate, and its density is 1.11 g / cm 3 , its melting point is 26~28℃.

4. The rubber sheath material for oil platform drilling cable according to claim 1, characterized in that: The antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline polymer, the softener is zinc stearate; the dispersant is a mixture of fatty acid and isoparaffin wax; the antioxidant is lead oxide with a density of 9.1 g / cm 3 ; The flame retardant is zinc borate; the carbon black is fast-pressed black, its heating loss is ≤1.0%, and its ash content is ≤0.5%.

5. The rubber sheath material for oil platform drilling cable according to claim 1, characterized in that: The silane coupling agent is γ-aminopropyltriethoxysilane, with a density of 0.942 g / cm 3 .

6. A method for preparing a rubber sheath material for oil platform drilling cables, characterized in that: The following steps are involved: S1, weigh the mass of various formulas according to the formula and its mass requirements; S2, preheating the internal mixer to a certain initial temperature, and heating the formula; the initial temperature is 65-75°C; S3, preheating the rubber filter, wherein the screw temperature is set at 80°C and the head temperature is set between 80 and 100°C; S4, putting the base material 1 and the base material 2 into an internal mixer, pressing down the top bolt and mixing for 2 minutes, so that the granular base material becomes a gel with certain plasticity and softness, and at the same time preventing excessive shearing from destroying the molecular chain length structure of EVA; S5, sequentially putting the aluminum hydroxide, the clay, the antioxidant, the softener, the dispersant, the antioxidant, the flame retardant, the carbon black, the silane coupling agent, and the plasticizer into an internal mixer, pressing down the top bolt, and starting the internal mixer for mixing; setting the internal mixing time to 5 to 10 minutes; At the same time, the cooling circulation device is turned on according to the banburying temperature to avoid the volatilization of part of the raw materials due to excessive temperature, resulting in premature loss, and to avoid aging failure problems. The banburying temperature does not exceed 115°C; S6, after the internal mixing is completed, the lower top bolt is opened, and the rubber material is discharged and transported to the roller mill for thin passing, which is used to improve the mixing effect and ensure that various additive ingredients are evenly dispersed. The number of thin passing is 5 times; S7, cutting a strip of rubber from the roller mill and conveying it to the inlet of the rubber filter for rubber filtering. The head of the rubber filter is provided with a filter screen of 20 mesh and a filter screen of 40 mesh. The rubber is first filtered through the filter screen of 20 mesh and then filtered through the filter screen of 40 mesh to filter out the difficult-to-mix rubber agglomerates remaining in the internal mixing process and impurities in the raw materials; When the glue is discharged normally from the machine head, the cutting machine is turned on to separate the glue mass into blocks for transfer to the next process; S8, conveying the rubber material discharged from the cutting machine to a roller mill for mixing and sheeting, and coating the rubber sheet with a thin layer of talcum powder to play an isolation role and prevent the rubber sheet from sticking; S9, placing the prepared film under natural conditions for more than 8 hours to recover fatigue and relax stress, reduce the shrinkage of the rubber material and better promote the uniform dispersion of the compounding agent; The treated rubber material is put back into the internal mixer, and the vulcanizing agent and the vulcanizing accelerator are added, the upper push pin is pressed down, and the internal mixer is started to start internal mixing; the internal mixing time is 2 minutes; S10, after the internal mixing is completed, the lower top bolt is opened, and the rubber material is discharged and conveyed to the roller mill for thinning 5 times to fully mix the vulcanizing agent and the rubber material; S11, cutting a strip of rubber from the roller mill and conveying it to another roller mill for mixing and forming a sheet; S12, sending the film mixed and sheeted in S11 to a Φ570 eight-roller cooling unit for cooling to prevent the accumulated waste heat from causing rubber vulcanization, and then coating a layer of talcum powder on the surface of the film to obtain a finished product; S13, performing a performance test on the rubber product obtained in S12, preparing a sample using a flat vulcanizer, and measuring the vulcanization curve of the rubber material using a vulcanometer before preparing the sample, so as to determine the vulcanization conditions for preparing the sample.

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