A corrosion-resistant and oil-resistant onshore power cable sheath material and its preparation method

Abstract

The present invention discloses a corrosion-resistant and oil-resistant onshore power cable sheath material and a preparation method thereof. The material comprises the following raw materials in parts by weight: 80-100 parts of modified resin, 8-10 parts of modified additive, 8-10 parts of strengthening agent, 5-10 parts of modified cellulose and 2-5 parts of benzoin ethyl ether. Castor oil is added during the preparation process of the modified resin, so that the modified resin forms a branched structure, and the molecular structure contains organosilicon segments, cyano groups, benzene rings and long-chain alkyl groups. The benzene ring structure has stable π electron clouds and is not easy to interact with oil molecules. The long-chain alkyl groups and organosilicon segments can increase the hydrophobicity of the material, thereby improving its oil resistance effect. The cyano group can endow the modified resin with strong polarity and further improve the oil resistance effect. The addition of modified fiber filaments can improve the integrity of the material, reduce the diffusion of corrosive media, and at the same time increase the crosslinking density, so as to further improve the corrosion resistance, oil resistance and water resistance effects.

Description

Technical Field

[0001] The present invention relates to the technical field of cable sheath material preparation, and in particular to a corrosion-resistant and oil-resistant shore power cable sheath material and a preparation method thereof. Background Art

[0002] As economic, trade, and cultural exchanges between countries become increasingly frequent, the number of ships traveling between countries increases. Ships arriving at ports are causing serious environmental pollution in port cities. Shore power transmission technology can provide clean energy for ships arriving at ports. To meet the high-power and graded load requirements of ports, high-voltage shore power cables are used for ship-to-shore mutual transmission. Shore power cables are laid exposed to the air in humid harbors, exposed to direct sunlight. Connections require the use of cranes, reels, and other facilities, and are affected by sea breezes and tidal sway during operation. To extend the service life of the cable, a sheath material is extruded onto its surface to protect the insulation and conductors from the external environment. The sheath of shore power cables is typically made of polyurethane, but traditional polyurethane materials have poor corrosion, oil, and water resistance. After a period of use, the sheath will age and no longer protect the cable. Summary of the Invention

[0003] The purpose of the present invention is to provide a corrosion-resistant and oil-resistant shore power cable sheath material and a preparation method thereof, which solves the problem that the current shore power cable sheath cannot protect the cable from normal operation for a long time in the harsh environment of the seaside.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a corrosion-resistant and oil-resistant shore power cable sheath material comprises the following steps:

[0006] Step A1: 2,2-dihydroxymethylpropionic acid, sodium hydroxide, and acetone are uniformly mixed, and the mixture is reacted at a speed of 120-150 r / min and a temperature of 20-25° C. for 1-1.5 hours. Then, allyl chloride is added, and the mixture is reacted for 3-5 hours. The pH is adjusted to acidic to obtain intermediate 1. Intermediate 1, dodecafluoroheptanol, p-toluenesulfonic acid, and toluene are uniformly mixed, and the mixture is reacted at a speed of 60-80 r / min and a temperature of 110-120° C. for 3-5 hours to obtain intermediate 2.

[0007] Step A2: Mix intermediate 2, triethoxysilane, chloroplatinic acid, and DMF evenly, introduce nitrogen for protection, and react for 6 - 8 h under the conditions of a rotation speed of 120 - 150 r / min and a temperature of 90 - 100 °C to obtain a modified additive. Mix dithiothreitol, dodecyl vinyl ether, benzophenone, and DMF evenly, and react for 3 - 5 h under the conditions of a rotation speed of 60 - 80 r / min, a temperature of 20 - 25 °C, and irradiation with 365 nm ultraviolet light. Then add isocyanatopropyltriethoxysilane and continue to react for 2 - 4 h to obtain a strengthening agent;

[0008] Step A3: Mix microcrystalline cellulose and sodium hydroxide solution, and react for 1 - 1.5 h under the conditions of a rotation speed of 200 - 300 r / min and a temperature of 20 - 25 °C. Then add allyl chloride and react for 3 - 5 h to obtain modified cellulose. Weigh the following raw materials in parts by weight: 80 - 100 parts of modified resin, 8 - 10 parts of modified additive, 8 - 10 parts of strengthening agent, 5 - 10 parts of modified cellulose, and 2 - 5 parts of benzoin ethyl ether. Melt - extrude the raw materials under the condition of a temperature of 170 - 180 °C, cool and soak in water for 1 - 1.5 h, and then irradiate and treat for 8 - 10 s under the condition of 365 nm ultraviolet light to obtain a corrosion - resistant and oil - resistant on - shore power cable sheath material.

[0009] Furthermore, the molar ratio of 2,2 - dimethylolpropionic acid, sodium hydroxide, and allyl chloride in Step A1 is 1:3.1:2, the molar ratio of intermediate 1 and dodecafluoroheptanol is 1:1, and the dosage of p - toluenesulfonic acid is 1% of the mass of dodecafluoroheptanol.

[0010] Furthermore, the molar ratio of intermediate 2 and triethoxysilane in Step A2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of triethoxysilane, the molar ratio of dithiothreitol, dodecyl vinyl ether, and isocyanatopropyltriethoxysilane is 1:2:2, and the dosage of benzophenone is 5‰ of the mass of dodecyl vinyl ether.

[0011] Furthermore, the dosage ratio of microcrystalline cellulose, sodium hydroxide solution, and allyl chloride in Step A3 is 2 g:30 mL:3 mL, and the mass fraction of the sodium hydroxide solution is 5%.

[0012] Furthermore, the modified resin is prepared by the following steps:

[0013] Step B1: Mix tetramethylcyclotetrasiloxane, acrylonitrile, chloroplatinic acid, and DMF evenly, introduce nitrogen for protection, and react for 4 - 6 h under the conditions of a rotation speed of 200 - 300 r / min and a temperature of 75 - 80 °C to obtain a modifier. Then mix octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, the modifier, tetramethylammonium hydroxide, tetramethyldisiloxane, and dimethyl sulfoxide evenly, introduce nitrogen for protection, and react for 3 - 5 h under the conditions of a rotation speed of 120 - 150 r / min and a temperature of 105 - 110 °C to obtain dihydropolysiloxane;

[0014] Step B2: Mix dihydropolysiloxane, p-hydroxycinnamic acid, chloroplatinic acid, and DMF evenly, introduce nitrogen for protection, and react for 3 - 5 h under the conditions of a rotation speed of 120 - 150 r / min and a temperature of 80 - 85 °C to obtain modified polysiloxane. Then mix the modified polysiloxane, dodecanol, p-toluenesulfonic acid, and toluene evenly, and react for 6 - 8 h under the conditions of a rotation speed of 60 - 80 r / min and a temperature of 110 - 120 °C to obtain a modified monomer;

[0015] Step B3: Add polycaprolactone diol to the reaction kettle, introduce nitrogen for protection, stir and add diphenylmethane diisocyanate and dibutyltin dilaurate under the conditions of a rotation speed of 60 - 80 r / min and a temperature of 60 - 65 °C, react for 2 - 3 h, then add the modified monomer and castor oil, continue to react for 2 - 3 h, cool down to 35 - 40 °C, add DMF and KH550, continue to react for 1 - 1.5 h, and dry to obtain the modified resin.

[0016] Furthermore, the molar ratio of tetramethylcyclotetrasiloxane to acrylonitrile in Step B1 is 1:4, the dosage of chloroplatinic acid is 1‰ of the mass of acrylonitrile, and the molar ratio of octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, the modifier, tetramethylammonium hydroxide, and tetramethyldisiloxane is 1.6:0.4:0.4:3:2.

[0017] Furthermore, the molar ratio of dihydropolysiloxane to p-hydroxycinnamic acid in Step B2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of p-hydroxycinnamic acid, the molar ratio of modified polysiloxane to dodecanol is 1:2, and the dosage of p-toluenesulfonic acid is 2% of the mass of dodecanol.

[0018] Furthermore, the molar ratio of polycaprolactone diol, diphenylmethane diisocyanate, the modified monomer, castor oil, and KH550 in Step B3 is 4.5:10:3:1.5:1, and the molecular weight of polycaprolactone diol is 2000.

[0019] Advantages of the present invention: A corrosion-resistant and oil-resistant onshore power cable sheath material prepared by the present invention reacts 2,2-dimethylolpropionic acid with sodium hydroxide to form sodium hydroxy, reacts the sodium hydroxy with the chlorine atom site on allyl chloride, adjusts the pH to acidic to obtain intermediate 1, reacts intermediate 1 with dodecafluoroheptanol to esterify the carboxyl group on intermediate 1 and the hydroxyl group on dodecafluoroheptanol to obtain intermediate 2, reacts intermediate 2 with triethoxysilane under the action of chloroplatinic acid to graft the double bond on intermediate 2 and the Si-H bond on triethoxysilane to obtain a modified additive, reacts dithioerythritol with dodecyl vinyl ether under the action of benzophenone by ultraviolet light irradiation to graft the mercapto group on dithioerythritol and the double bond on dodecyl vinyl ether, and then adds isocyanatopropyltriethoxysilane to react the mercapto group on isocyanatopropyltriethoxysilane with the alcohol hydroxyl group on dithioerythritol to obtain a strengthening agent, treats microcrystalline cellulose with sodium hydroxide to form sodium cellulose, and then reacts with allyl chloride to graft a double bond on the cellulose molecule, melts and extrudes the modified resin, modified additive, strengthening agent, modified cellulose and benzoin ethyl ether, soaks them in cold water, hydrolyzes and condenses the siloxane on the modified resin, modified additive and strengthening agent molecules, and then under ultraviolet light irradiation, grafts the double bonds on the modified resin, modified additive, strengthening agent and modified cellulose molecules to obtain a corrosion-resistant and oil-resistant onshore power cable sheath material.

[0020] The modified resin reacts tetramethylcyclotetrasiloxane with acrylonitrile under the action of chloroplatinic acid to make the Si-H bond on tetramethylcyclotetrasiloxane and the double bond on acrylonitrile to obtain a modifier, ring-opens octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane and the modifier, and then condenses with tetramethyldisiloxane to obtain dihydropolysiloxane, reacts dihydropolysiloxane with p-hydroxycinnamic acid to graft the Si-H bond on dihydropolysiloxane and the double bond on p-hydroxycinnamic acid to obtain modified polysiloxane, reacts modified polysiloxane with dodecanol to esterify the carboxyl group on modified polysiloxane and the hydroxyl group on dodecanol to obtain a modified monomer, reacts polycaprolactone diol with diphenylmethane diisocyanate to form a polyurethane prepolymer, extends the chain with the modified monomer and castor oil, and finally caps it with KH550 to obtain a modified resin.

[0021] During the preparation of the modified resin, castor oil is added, enabling the modified resin to form a branched structure. The molecular structure contains silicone segments, cyano groups, benzene rings, and long-chain alkyl groups. The benzene ring structure has stable π electron clouds and is not prone to interacting with oil molecules. The long-chain alkyl groups and silicone segments can increase the hydrophobicity of the material, thereby enhancing its oil resistance effect. The cyano group can endow the modified resin with strong polarity, further enhancing the oil resistance effect. After extrusion, cold water immersion and ultraviolet light irradiation treatments can form a silicone coating on the surface of the silicone resin, and at the same time form a long-chain fluoroalkane and long-chain alkyl protective layer, thereby preventing water, oil, and corrosive substances from contacting the modified resin. The addition of modified fiber filaments can improve the integrity of the material, reduce the diffusion of corrosive media, and at the same time increase the crosslinking density, further enhancing the corrosion resistance, oil resistance, and water resistance effects. Detailed implementation mode

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Example 1

[0024] A preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material specifically includes the following steps:

[0025] Step A1: Mix 2,2-dimethylolpropionic acid, sodium hydroxide, and acetone evenly. Under the conditions of a rotation speed of 120 r / min and a temperature of 20 °C, react for 1 h, add allyl chloride, react for 3 h, adjust the pH to acidic, and obtain intermediate 1. Mix intermediate 1, dodecafluoroheptanol, p-toluenesulfonic acid, and toluene evenly. Under the conditions of a rotation speed of 60 r / min and a temperature of 110 °C, react for 3 h to obtain intermediate 2;

[0026] Step A2: Mix intermediate 2, triethoxysilane, chloroplatinic acid, and DMF evenly, introduce nitrogen protection, and under the conditions of a rotation speed of 120 r / min and a temperature of 90 °C, react for 6 h to obtain a modified additive. Mix dithioerythritol, dodecyl vinyl ether, benzophenone, and DMF evenly. Under the conditions of a rotation speed of 60 r / min, a temperature of 20 °C, and ultraviolet light irradiation at 365 nm, react for 3 h, add isocyanatopropyltriethoxysilane, and continue to react for 2 h to obtain a strengthening agent;

[0027] Step A3: Mix microcrystalline cellulose and sodium hydroxide solution, react for 1 h under the conditions of a rotation speed of 200 r / min and a temperature of 20 °C, add allyl chloride, and react for 3 h to obtain modified cellulose. Weigh the following raw materials by weight: 80 parts of modified resin, 8 parts of modified additive, 8 parts of strengthening agent, 5 parts of modified cellulose, and 2 parts of benzoin ethyl ether. Melt and extrude the raw materials under the condition of a temperature of 170 °C, cool and soak in water for 1 h, and then irradiate and treat for 8 s under the condition of 365 nm ultraviolet light to obtain the corrosion-resistant and oil-resistant onshore power cable sheath material.

[0028] The molar ratio of 2,2-dimethylolpropionic acid, sodium hydroxide, and allyl chloride described in Step A1 is 1:3.1:2, the molar ratio of Intermediate 1 and dodecafluoroheptanol is 1:1, and the dosage of p-toluenesulfonic acid is 1% of the mass of dodecafluoroheptanol.

[0029] The molar ratio of Intermediate 2 and triethoxysilane described in Step A2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of triethoxysilane, the molar ratio of dithiothreitol, dodecyl vinyl ether, and isocyanatopropyltriethoxysilane is 1:2:2, and the dosage of benzophenone is 5‰ of the mass of dodecyl vinyl ether.

[0030] The dosage ratio of microcrystalline cellulose, sodium hydroxide solution, and allyl chloride described in Step A3 is 2 g:30 mL:3 mL, and the mass fraction of the sodium hydroxide solution is 5%.

[0031] The described modified resin is prepared by the following steps:

[0032] Step B1: Mix tetramethylcyclotetrasiloxane, acrylonitrile, chloroplatinic acid, and DMF evenly, introduce nitrogen protection, and react for 4 h under the conditions of a rotation speed of 200 r / min and a temperature of 75 °C to obtain a modifier. Mix octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, the modifier, tetramethylammonium hydroxide, tetramethyldisiloxane, and dimethyl sulfoxide evenly, introduce nitrogen protection, and react for 3 h under the conditions of a rotation speed of 120 r / min and a temperature of 105 °C to obtain dihydropolysiloxane;

[0033] Step B2: Mix dihydropolysiloxane, p-hydroxycinnamic acid, chloroplatinic acid, and DMF evenly, introduce nitrogen protection, and react for 3 h under the conditions of a rotation speed of 120 r / min and a temperature of 80 °C to obtain modified polysiloxane. Mix the modified polysiloxane, dodecanol, p-toluenesulfonic acid, and toluene evenly, and react for 6 h under the conditions of a rotation speed of 60 r / min and a temperature of 110 °C to obtain a modified monomer;

[0034] Step B3: Add polycaprolactone diol into the reaction kettle, introduce nitrogen for protection, stir and add diphenylmethane diisocyanate and dibutyltin dilaurate at a rotation speed of 60 r / min and a temperature of 60 °C, react for 2 h, then add the modified monomer and castor oil, continue to react for 2 h, cool down to 35 °C, add DMF and KH550, continue to react for 1 h, and dry to obtain the modified resin.

[0035] The molar ratio of tetramethylcyclotetrasiloxane to acrylonitrile described in Step B1 is 1:4, the dosage of chloroplatinic acid is 1‰ of the mass of acrylonitrile, and the molar ratio of octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, modifier, tetramethylammonium hydroxide, and tetramethyldisiloxane is 1.6:0.4:0.4:3:2.

[0036] The molar ratio of dihydropolysiloxane to p-hydroxycinnamic acid described in Step B2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of p-hydroxycinnamic acid, the molar ratio of modified polysiloxane to dodecanol is 1:2, and the dosage of p-toluenesulfonic acid is 2% of the mass of dodecanol.

[0037] The molar ratio of polycaprolactone diol, diphenylmethane diisocyanate, modified monomer, castor oil, and KH550 described in Step B3 is 4.5:10:3:1.5:1, and the molecular weight of polycaprolactone diol is 2000.

[0038] Example 2

[0039] A preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material specifically includes the following steps:

[0040] Step A1: Mix 2,2-dimethylolpropionic acid, sodium hydroxide, and acetone evenly, react for 1 h at a rotation speed of 150 r / min and a temperature of 20 °C, add allyl chloride, react for 4 h, adjust the pH to acidic to obtain Intermediate 1, mix Intermediate 1, dodecafluorooctanol, p-toluenesulfonic acid, and toluene evenly, and react for 4 h at a rotation speed of 60 r / min and a temperature of 115 °C to obtain Intermediate 2;

[0041] Step A2: Mix Intermediate 2, triethoxysilane, chloroplatinic acid, and DMF evenly, introduce nitrogen for protection, react for 7 h at a rotation speed of 120 r / min and a temperature of 95 °C to obtain a modified additive, mix dithioerythritol, dodecyl vinyl ether, benzophenone, and DMF evenly, react for 4 h at a rotation speed of 60 r / min, a temperature of 25 °C, and under the irradiation of 365 nm ultraviolet light, add isocyanatopropyltriethoxysilane, and continue to react for 3 h to obtain a strengthening agent;

[0042] Step A3: Mix microcrystalline cellulose and sodium hydroxide solution, react for 1 h under the conditions of a rotation speed of 200 r / min and a temperature of 25 °C, add allyl chloride, and react for 4 h to obtain modified cellulose. Weigh the following raw materials in parts by weight: 90 parts of modified resin, 9 parts of modified additive, 9 parts of strengthening agent, 8 parts of modified cellulose, and 3 parts of benzoin ethyl ether. Melt and extrude the raw materials under the condition of a temperature of 175 °C, cool and soak in water for 1.5 h, and then irradiate and treat for 9 s under the condition of 365 nm ultraviolet light to obtain a corrosion-resistant and oil-resistant onshore power cable sheath material.

[0043] The molar ratio of 2,2-dimethylolpropionic acid, sodium hydroxide, and allyl chloride described in Step A1 is 1:3.1:2, the molar ratio of Intermediate 1 and dodecafluoroheptanol is 1:1, and the dosage of p-toluenesulfonic acid is 1% of the mass of dodecafluoroheptanol.

[0044] The molar ratio of Intermediate 2 and triethoxysilane described in Step A2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of triethoxysilane, the molar ratio of dithioerythritol, dodecyl vinyl ether, and isocyanatopropyltriethoxysilane is 1:2:2, and the dosage of benzophenone is 5‰ of the mass of dodecyl vinyl ether.

[0045] The dosage ratio of microcrystalline cellulose, sodium hydroxide solution, and allyl chloride described in Step A3 is 2 g:30 mL:3 mL, and the mass fraction of the sodium hydroxide solution is 5%.

[0046] The described modified resin is prepared by the following steps:

[0047] Step B1: Mix tetramethylcyclotetrasiloxane, acrylonitrile, chloroplatinic acid, and DMF evenly, introduce nitrogen protection, and react for 5 h under the conditions of a rotation speed of 200 r / min and a temperature of 80 °C to obtain a modifier. Mix octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, the modifier, tetramethylammonium hydroxide, tetramethyldisiloxane, and dimethyl sulfoxide evenly, introduce nitrogen protection, and react for 3 - 5 h under the conditions of a rotation speed of 120 r / min and a temperature of 110 °C to obtain dihydropolysiloxane;

[0048] Step B2: Mix dihydropolysiloxane, p-hydroxycinnamic acid, chloroplatinic acid, and DMF evenly, introduce nitrogen protection, and react for 4 h under the conditions of a rotation speed of 120 r / min and a temperature of 85 °C to obtain modified polysiloxane. Mix the modified polysiloxane, dodecanol, p-toluenesulfonic acid, and toluene evenly, and react for 7 h under the conditions of a rotation speed of 60 r / min and a temperature of 115 °C to obtain a modified monomer;

[0049] Step B3: Add polycaprolactone diol into the reaction kettle, introduce nitrogen for protection, stir and add diphenylmethane diisocyanate and dibutyltin dilaurate under the conditions of a rotation speed of 80 r / min and a temperature of 60 °C. After reacting for 2 h, add the modified monomer and castor oil, continue to react for 3 h, cool down to 35 °C, add DMF and KH550, continue to react for 1.5 h, and dry to obtain the modified resin.

[0050] The molar ratio of tetramethylcyclotetrasiloxane to acrylonitrile described in Step B1 is 1:4, the dosage of chloroplatinic acid is 1‰ of the mass of acrylonitrile, and the molar ratio of octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, modifier, tetramethylammonium hydroxide, and tetramethyldisiloxane is 1.6:0.4:0.4:3:2.

[0051] The molar ratio of dihydropolysiloxane to p-hydroxycinnamic acid described in Step B2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of p-hydroxycinnamic acid, the molar ratio of modified polysiloxane to dodecanol is 1:2, and the dosage of p-toluenesulfonic acid is 2% of the mass of dodecanol.

[0052] The molar ratio of polycaprolactone diol, diphenylmethane diisocyanate, modified monomer, castor oil, and KH550 described in Step B3 is 4.5:10:3:1.5:1, and the molecular weight of polycaprolactone diol is 2000.

[0053] Example 3

[0054] A preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material specifically includes the following steps:

[0055] Step A1: Mix 2,2-dimethylolpropionic acid, sodium hydroxide, and acetone evenly, react for 1.5 h under the conditions of a rotation speed of 150 r / min and a temperature of 25 °C, add allyl chloride, react for 5 h, adjust the pH to acidic to obtain Intermediate 1. Mix Intermediate 1, dodecafluoroheptanol, p-toluenesulfonic acid, and toluene evenly, and react for 5 h under the conditions of a rotation speed of 80 r / min and a temperature of 120 °C to obtain Intermediate 2;

[0056] Step A2: Mix Intermediate 2, triethoxysilane, chloroplatinic acid, and DMF evenly, introduce nitrogen for protection, and react for 8 h under the conditions of a rotation speed of 150 r / min and a temperature of 100 °C to obtain a modified additive. Mix dithioerythritol, dodecyl vinyl ether, benzophenone, and DMF evenly, and react for 5 h under the conditions of a rotation speed of 80 r / min, a temperature of 25 °C, and 365 nm ultraviolet light irradiation. Add isocyanatopropyltriethoxysilane and continue to react for 4 h to obtain a strengthening agent;

[0057] Step A3: Mix microcrystalline cellulose and sodium hydroxide solution, react for 1.5 h under the conditions of a rotation speed of 300 r / min and a temperature of 25 °C, add allyl chloride, and react for 5 h to obtain modified cellulose. Weigh the following raw materials in parts by weight: 100 parts of modified resin, 10 parts of modified additive, 10 parts of strengthening agent, 10 parts of modified cellulose, and 5 parts of benzoin ethyl ether. Melt and extrude the raw materials under the condition of a temperature of 180 °C, cool and soak in water for 1.5 h, and then irradiate and treat for 10 s under the condition of 365 nm ultraviolet light to obtain the corrosion-resistant and oil-resistant onshore power cable sheath material.

[0058] The molar ratio of 2,2-dimethylolpropionic acid, sodium hydroxide, and allyl chloride described in Step A1 is 1:3.1:2, the molar ratio of Intermediate 1 and dodecafluoroheptanol is 1:1, and the dosage of p-toluenesulfonic acid is 1% of the mass of dodecafluoroheptanol.

[0059] The molar ratio of Intermediate 2 and triethoxysilane described in Step A2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of triethoxysilane, the molar ratio of dithiothreitol, dodecyl vinyl ether, and isocyanatopropyltriethoxysilane is 1:2:2, and the dosage of benzophenone is 5‰ of the mass of dodecyl vinyl ether.

[0060] The dosage ratio of microcrystalline cellulose, sodium hydroxide solution, and allyl chloride described in Step A3 is 2 g:30 mL:3 mL, and the mass fraction of the sodium hydroxide solution is 5%.

[0061] The described modified resin is prepared by the following steps:

[0062] Step B1: Mix tetramethylcyclotetrasiloxane, acrylonitrile, chloroplatinic acid, and DMF evenly, introduce nitrogen protection, and react for 6 h under the conditions of a rotation speed of 300 r / min and a temperature of 80 °C to obtain a modifier. Mix octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, the modifier, tetramethylammonium hydroxide, tetramethyldisiloxane, and dimethyl sulfoxide evenly, introduce nitrogen protection, and react for 5 h under the conditions of a rotation speed of 150 r / min and a temperature of 110 °C to obtain dihydropolysiloxane;

[0063] Step B2: Mix dihydropolysiloxane, p-hydroxycinnamic acid, chloroplatinic acid, and DMF evenly, introduce nitrogen protection, and react for 5 h under the conditions of a rotation speed of 150 r / min and a temperature of 85 °C to obtain modified polysiloxane. Mix the modified polysiloxane, dodecanol, p-toluenesulfonic acid, and toluene evenly, and react for 8 h under the conditions of a rotation speed of 80 r / min and a temperature of 120 °C to obtain a modified monomer.

[0064] Step B3: Add polycaprolactone diol into the reaction kettle, introduce nitrogen for protection, stir and add diphenylmethane diisocyanate and dibutyltin dilaurate at a rotation speed of 80 r / min and a temperature of 65 °C. After reacting for 3 h, add the modified monomer and castor oil, continue to react for 3 h, cool down to 40 °C, add DMF and KH550, continue to react for 1.5 h, and dry to obtain the modified resin.

[0065] The molar ratio of tetramethylcyclotetrasiloxane to acrylonitrile described in Step B1 is 1:4, the dosage of chloroplatinic acid is 1‰ of the mass of acrylonitrile, and the molar ratio of octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, modifier, tetramethylammonium hydroxide and tetramethyldisiloxane is 1.6:0.4:0.4:3:2.

[0066] The molar ratio of dihydropolysiloxane to p-hydroxycinnamic acid described in Step B2 is 1:2, the dosage of chloroplatinic acid is 1‰ of the mass of p-hydroxycinnamic acid, the molar ratio of modified polysiloxane to dodecanol is 1:2, and the dosage of p-toluenesulfonic acid is 2% of the mass of dodecanol.

[0067] The molar ratio of polycaprolactone diol, diphenylmethane diisocyanate, modified monomer, castor oil and KH550 described in Step B3 is 4.5:10:3:1.5:1, and the molecular weight of polycaprolactone diol is 2000.

[0068] Comparative Example 1

[0069] In this comparative example, no modified additive was added compared with Example 1, and the remaining steps were the same.

[0070] Comparative Example 2

[0071] In this comparative example, no strengthening agent was added compared with Example 1, and the remaining steps were the same.

[0072] Comparative Example 3

[0073] In this comparative example, no modified cellulose was added compared with Example 1, and the remaining steps were the same.

[0074] Comparative Example 4

[0075] In this comparative example, no castor oil was added compared with Example 1, and the remaining steps were the same.

[0076] Comparative Example 5

[0077] In this comparative example, ethylenediamine monomer was used as the modified monomer compared with Example 1, and the remaining steps were the same.

[0078] The materials prepared in Examples 1-3 and Comparative Examples 1-5 were made into specimens with dimensions of 25 mm × 4 mm × 2 mm. The tensile strength was measured under the condition of a tensile rate of 200 mm / min. The specimens were respectively immersed in an acetic acid solution with a mass fraction of 15%, a sodium hydroxide solution with a mass fraction of 15%, a sodium chloride solution with a mass fraction of 15%, and IRM No. 903 oil at a temperature of 25°C for 96 h, and then the tensile strength was measured. The decrease rate of the tensile strength was calculated, and the results are shown in the following table.

[0079]

[0080] It can be seen from the above table that the present application has good corrosion resistance and oil resistance.

[0081] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the specific embodiments described, or use similar methods to replace them. As long as they do not deviate from the concept of the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. A preparation method of a sheath material for a corrosion-resistant and oil-resistant onshore power cable, characterized in that: Specifically, it includes the following steps: Step A1: Mix 2,2-dimethylolpropionic acid, sodium hydroxide and acetone for reaction, add allyl chloride, react for 3 - 5 h, adjust the pH to acidic to obtain Intermediate 1. Mix Intermediate 1, dodecafluoroheptanol, p-toluenesulfonic acid and toluene for reaction to obtain Intermediate 2; Step A2: Mix Intermediate 2, triethoxysilane, chloroplatinic acid and DMF evenly, introduce nitrogen for protection and react to obtain a modified additive. Mix dithiothreitol, dodecyl vinyl ether, benzophenone and DMF for reaction, add isocyanatopropyltriethoxysilane and continue to react to obtain a strengthening agent; Step A3: Mix microcrystalline cellulose and sodium hydroxide solution for reaction, add allyl chloride and continue to react to obtain modified cellulose. Weigh the following raw materials in parts by weight: 80 - 100 parts of modified resin, 8 - 10 parts of modified additive, 8 - 10 parts of strengthening agent, 5 - 10 parts of modified cellulose and 2 - 5 parts of benzoin ethyl ether. Melt and extrude the raw materials at a temperature of 170 - 180 °C, cool and soak in water, and then perform ultraviolet irradiation treatment to obtain a corrosion-resistant and oil-resistant onshore power cable sheath material; The modified resin is prepared by the following steps: Step B1: Mix tetramethylcyclotetrasiloxane, acrylonitrile, chloroplatinic acid and DMF evenly, introduce nitrogen for protection and react to obtain a modifier. Mix octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, modifier, tetramethylammonium hydroxide, tetramethyldisiloxane and dimethyl sulfoxide evenly, introduce nitrogen for protection and react to obtain dihydrogen polysiloxane; Step B2: Mix dihydrogen polysiloxane, p-hydroxycinnamic acid, chloroplatinic acid and DMF evenly, introduce nitrogen for protection and react to obtain modified polysiloxane. Mix modified polysiloxane, dodecanol, p-toluenesulfonic acid and toluene for reaction to obtain a modified monomer; Step B3: Add polycaprolactone diol to the reaction kettle, introduce nitrogen for protection, stir and add diphenylmethane diisocyanate and dibutyltin dilaurate, react, then add the modified monomer and castor oil, continue to react, cool down and add DMF and KH550, continue to react, and dry to obtain the modified resin.

2. The preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material according to claim 1, characterized in that: The molar ratio of 2,2-dimethylolpropionic acid, sodium hydroxide and allyl chloride in Step A1 is 1:3.1:2, and the molar ratio of Intermediate 1 and dodecafluoroheptanol is 1:

1.

3. The preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material according to claim 1, characterized in that: The molar ratio of Intermediate 2 and triethoxysilane in Step A2 is 1:2, and the molar ratio of dithiothreitol, dodecyl vinyl ether and isocyanatopropyltriethoxysilane is 1:2:

2.

4. The preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material according to claim 1, characterized in that: The dosage ratio of microcrystalline cellulose, sodium hydroxide solution and allyl chloride in Step A3 is 2 g:30 mL:3 mL.

5. The preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material according to claim 1, characterized in that: The molar ratio of tetramethylcyclotetrasiloxane and acrylonitrile in Step B1 is 1:4, and the molar ratio of octamethylcyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, modifier, tetramethylammonium hydroxide and tetramethyldisiloxane is 1.6:0.4:0.4:3:

2.

6. The preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material according to claim 1, characterized in that: The molar ratio of the dihydropolysiloxane and p-hydroxycinnamic acid described in step B2 is 1:2, and the molar ratio of the modified polysiloxane and dodecanol is 1:

2.

7. The preparation method of a corrosion-resistant and oil-resistant onshore power cable sheath material according to claim 1, characterized in that: The molar ratio of the polycaprolactone diol, diphenylmethane diisocyanate, modified monomer, castor oil and KH550 described in step B3 is 4.5:10:3:1.5:

1.

8. A corrosion-resistant and oil-resistant onshore power cable sheath material, characterized in that: Prepared by the preparation method according to any one of claims 1-7.

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