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CN-121991490-A - Polyurethane resin for cable water blocking tape and preparation method thereof

CN121991490ACN 121991490 ACN121991490 ACN 121991490ACN-121991490-A

Abstract

The invention discloses a polyurethane resin for a cable water-blocking tape and a preparation method thereof, wherein pretreated polyurethane, modified filler and dimethylbenzene are uniformly mixed to prepare the polyurethane resin for the cable water-blocking tape, the polyurethane resin is influenced by moisture in air in the use process of the polyurethane resin, siloxane on the surface of the modified filler and siloxane on the pretreated polyurethane are hydrolyzed and condensed, so that the compactness of the material is further improved, the hydrophobic effect of the polyurethane resin is further improved, the branched structure of the pretreated polyurethane molecules enables molecular chains to be piled more densely, water molecules and oxygen are more difficult to permeate into a polyurethane main chain, easily-hydrolyzed groups are attacked, the service life of the water-blocking tape is prolonged, the cable keeps stable radial water-blocking capability in long-term operation, the C-F bond energy in the polyurethane is extremely low, the surface of the material has extremely low surface energy, a water-blocking layer is further formed on the surface, the permeation of water vapor can be effectively blocked, and the water-blocking effect is further improved.

Inventors

  • SUN YUFEI
  • ZHANG SHILONG
  • HUO YUWEN

Assignees

  • 威海江源高分子科技有限公司

Dates

Publication Date
20260508
Application Date
20260303

Claims (9)

  1. 1. A preparation method of polyurethane resin for a cable water-blocking tape is characterized by comprising the following steps: A1, mixing octamethyl cyclotetrasiloxane, tetramethylammonium hydroxide, tetramethyl disiloxane and tetrahydrofuran, introducing nitrogen for protection, reacting to obtain hydrogen polysiloxane, mixing hydrogen polysiloxane, vinyl trichlorosilane, chloroplatinic acid and xylene, introducing nitrogen for protection, and reacting to obtain modified polysiloxane; A2, mixing lithium dimethylhydrogen silanol and tetrahydrofuran, introducing nitrogen for protection, stirring, adding trifluoropropyl methyl cyclotrisiloxane, heating for reaction, adding modified polysiloxane, continuing to react for 2-3h to obtain branched polysiloxane, mixing branched polysiloxane, allyl alcohol, chloroplatinic acid and xylene, introducing nitrogen for protection, and reacting to obtain a modified monomer; and step A3, mixing polycaprolactone diol, dibutyl tin dilaurate and dimethylbenzene, introducing nitrogen for protection, stirring, adding isophorone diisocyanate, reacting, adding a modified monomer, continuing the reaction, adding gamma-aminopropyl triethoxysilane, continuing the reaction, preparing pretreated polyurethane, and uniformly mixing the pretreated polyurethane, the modified filler and the dimethylbenzene to prepare the polyurethane resin for the cable water-blocking tape.
  2. 2. The method for preparing a polyurethane resin for a cable water-blocking tape according to claim 1, wherein the molar ratio of octamethyl cyclotetrasiloxane, tetramethylammonium hydroxide and tetramethyldisiloxane in the step A1 is 1.2:1.5:1, and the molar ratio of the hydrogen polysiloxane and vinyl trichlorosilane is 1:2.
  3. 3. The method for preparing a polyurethane resin for a cable water-blocking tape according to claim 1, wherein the molar ratio of lithium dimethylhydrogensilylate, trifluoropropyl methyl cyclotrisiloxane to Si-Cl on the modified polysiloxane in the step A2 is 1:4:1, and the molar ratio of Si-H bond on the branched polysiloxane to allyl alcohol is 1:1.
  4. 4. The method for preparing the polyurethane resin for the cable water-blocking tape according to claim 1, wherein the molar ratio of the polycaprolactone diol, the isophorone diisocyanate, the modified monomer and the gamma-aminopropyl triethoxysilane in the step A3 is 12:18:1:6, and the mass ratio of the pretreated polyurethane to the modified filler to the xylene is 100:5-8:40.
  5. 5. The method for preparing the polyurethane resin for the cable water-blocking tape according to claim 1, wherein the modified filler is prepared by the following steps: dissolving perfluorohexyl propanol in toluene, stirring, adding potassium hydroxide and tetrabutylammonium bromide, reacting, cooling, adding epichlorohydrin, reacting, adding sodium hydroxide, and continuing to react to obtain a modifier; Step B2, dispersing nano silicon dioxide in ethanol, stirring and adding gamma-aminopropyl triethoxysilane and deionized water for reaction to obtain pretreated silicon dioxide, uniformly mixing the pretreated silicon dioxide, a modifier and toluene, introducing nitrogen for protection, adding triethylamine for reaction, and obtaining functional silicon dioxide; And B3, dispersing the functionalized silica in toluene, introducing nitrogen for protection, stirring, adding dibutyl tin dilaurate and propyl triethoxysilane, and reacting to obtain the modified filler.
  6. 6. The method for preparing a polyurethane resin for a cable water-blocking tape according to claim 5, wherein the molar ratio of perfluorohexyl propanol, potassium hydroxide, tetrabutylammonium bromide, epichlorohydrin and sodium hydroxide in the step B1 is 1:1.2:0.03:1:1.3.
  7. 7. The method for preparing a polyurethane resin for a cable water-blocking tape according to claim 5, wherein the amount of gamma-aminopropyl triethoxysilane in the step B2 is 4% of the mass of the nano silica, and the molar ratio of the amino groups on the pretreated silica to the modifier is 1:2.1.
  8. 8. The method of preparing a polyurethane resin for a cable water-blocking tape according to claim 5, wherein the molar ratio of hydroxyl groups on the functionalized silica to propyltriethoxysilane in the step B3 is 1:1.
  9. 9. A polyurethane resin for a cable water-blocking tape, which is characterized by being prepared by the preparation method according to any one of claims 1-8.

Description

Polyurethane resin for cable water blocking tape and preparation method thereof Technical Field The invention relates to the field of polyurethane resin preparation, in particular to polyurethane resin for a cable water-blocking tape and a preparation method thereof. Background With the rapid development of the power communication industry, the cable has increasingly wide application fields including underground direct burial, submarine laying, rail transit, oil and gas platforms and other humid or even underwater environments. When the cable sheath is damaged due to mechanical damage or aging, once the external moisture invades the cable, the cable sheath longitudinally permeates along a gap between conductors or a cable core, the signal attenuation and the insulation performance are reduced, the electrochemical reaction and the ablation failure of a buffer layer are caused by heavy weight, even the cable breakdown is scrapped, the running stability and the service life of a power system are seriously threatened, the water blocking belt is one of core materials for realizing the radial water blocking function of the cable at present, polyurethane resin plays an increasingly important role in the cable water blocking material due to excellent mechanical property, wear resistance, oil resistance, flexibility and adjustable molecular structure, but the chemical resistance, hydrolysis resistance and hydrophobicity of the traditional polyurethane coating are difficult to meet the long-term reliability requirements, and the water blocking function is possibly invalid. Disclosure of Invention The invention aims to provide polyurethane resin for a cable water-blocking tape and a preparation method thereof, which solve the problem that the waterproof effect of the polyurethane resin is common at the present stage. The aim of the invention can be achieved by the following technical scheme: The preparation method of the polyurethane resin for the cable water blocking tape specifically comprises the following steps: Step A1, mixing octamethyl cyclotetrasiloxane, tetramethylammonium hydroxide, tetramethyl disiloxane and tetrahydrofuran, introducing nitrogen for protection, reacting for 3-5 hours at the rotation speed of 150-200r/min and the temperature of 90-100 ℃ to obtain hydrogen polysiloxane, mixing hydrogen polysiloxane, vinyl trichlorosilane, chloroplatinic acid and dimethylbenzene, introducing nitrogen for protection, and reacting for 6-8 hours at the rotation speed of 120-150r/min and the temperature of 80-85 ℃ to obtain modified polysiloxane; Step A2, mixing lithium dimethylhydrogen silanol and tetrahydrofuran, introducing nitrogen for protection, stirring and adding trifluoropropyl methyl cyclotrisiloxane at the rotating speed of 150-200r/min and the temperature of 0 ℃, heating to 20-25 ℃, reacting for 20-24 hours, adding modified polysiloxane, continuing to react for 2-3 hours to obtain branched polysiloxane, mixing the branched polysiloxane, allyl alcohol, chloroplatinic acid and xylene, introducing nitrogen for protection, and reacting for 6-8 hours at the rotating speed of 200-300 r/min and the temperature of 80-85 ℃ to obtain a modified monomer; And step A3, mixing polycaprolactone diol, dibutyl tin dilaurate and dimethylbenzene, introducing nitrogen for protection, stirring and adding isophorone diisocyanate at the rotation speed of 150-200r/min and the temperature of 85-90 ℃ for 2-3 hours, adding a modified monomer, continuing to react for 2-3 hours, adding gamma-aminopropyl triethoxysilane, continuing to react for 2-3 hours, preparing pretreated polyurethane, and uniformly mixing the pretreated polyurethane, modified filler and dimethylbenzene to obtain the polyurethane resin for the cable water-stop. Further, the molar ratio of octamethyl cyclotetrasiloxane, tetramethyl ammonium hydroxide and tetramethyl disiloxane in the step A1 is 1.2:1.5:1, the molar ratio of the hydrogen polysiloxane and the vinyl trichlorosilane is 1:2, and the amount of chloroplatinic acid is 0.01 percent of the mass of the vinyl trichlorosilane. Further, the molar ratio of lithium dimethylhydrogen silanol, trifluoropropyl methyl cyclotrisiloxane and Si-Cl on the modified polysiloxane in step A2 is 1:4:1, the molar ratio of Si-H bond on the branched polysiloxane and allyl alcohol is 1:1, and the amount of chloroplatinic acid is 0.01% of the mass of allyl alcohol. Further, the molar ratio of the polycaprolactone diol to the isophorone diisocyanate to the modified monomer to the gamma-aminopropyl triethoxysilane in the step A3 is 12:18:1:6, the dosage of the dibutyl tin dilaurate is 1% of the mass of the isophorone diisocyanate, and the mass ratio of the pretreated polyurethane to the modified filler to the xylene is 100:5-8:40. Further, the modified filler is prepared by the following steps: Dissolving perfluorohexyl propanol in toluene, stirring and adding potassium hydroxide and tetrabutylammonium bromide at the rotation speed