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CN-121989509-A - High-flexibility pressure-resistant rubber hose and preparation method thereof

CN121989509ACN 121989509 ACN121989509 ACN 121989509ACN-121989509-A

Abstract

The invention relates to the technical field of rubber hoses and discloses a high-flexibility pressure-resistant rubber hose and a preparation method thereof, wherein the preparation method comprises the following steps of putting inner layer rubber compound into an extruder, extruding and forming the inner layer rubber into a tubular inner rubber layer at 70-90 ℃, then preparing a tubular skeleton from polyester toughened palm fibers on the surface of the tubular inner rubber layer by a braiding machine, controlling the braiding density to 80-95%, and the braiding angle to 45-60 ℃, putting outer layer rubber compound into the extruder, extruding and coating the outer side of the skeleton layer at 70-90 ℃, and obtaining a composite hose blank integrally; and (3) conveying the tube blank into vulcanizing equipment, controlling the vulcanizing pressure to be 0.8-1.2MPa, controlling the temperature to be 150-170 ℃, preserving heat and vulcanizing for 25-50min, and cooling after the vulcanizing is finished to obtain the high-flexibility pressure-resistant rubber hose. The high-flexibility pressure-resistant rubber hose prepared by the invention has good pressure-resistant performance, flexibility and ageing-resistant performance.

Inventors

  • LI YUEJUN
  • Li Zaiqiong

Assignees

  • 东营广友橡胶有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (10)

  1. 1. The high-flexibility pressure-resistant rubber hose is characterized by sequentially comprising an inner adhesive layer, a reinforced framework layer and an outer adhesive layer from inside to outside; The inner adhesive layer comprises the following components, by weight, 100 parts of nitrile rubber, 30-40 parts of carbon black N550, 8-12 parts of plasticizer DOS, 4-6 parts of zinc oxide, 1.5-2 parts of sulfur, 1-2 parts of stearic acid, 2-3 parts of antioxidant RD and 1-1.5 parts of accelerator CZ; the reinforced framework layer is formed into a tubular structure by polyester toughened palm fibers through a braiding process; The outer adhesive layer is made of a rubber composition and comprises the following components, by weight, 100 parts of ethylene propylene diene monomer, 20-30 parts of modified nano silicon dioxide, 1-3 parts of modified diallyl bisphenol A derivative, 20-25 parts of carbon black N550, 5-10 parts of paraffin oil, 4-6 parts of zinc oxide, 0.5-1.5 parts of sulfur, 1-1.5 parts of accelerator CZ, 1-2 parts of stearic acid and 2-3 parts of antioxidant RD.
  2. 2. The high-flexibility pressure-resistant rubber hose according to claim 1, wherein the modified nano-silica is prepared by the following steps: adding lauryl alcohol, succinic anhydride and anhydrous sodium acetate into a reactor, stirring at 60-70 ℃ for reaction for 3-4 hours, adding n-hexane into the reactor after the reaction is finished, continuously stirring at 60-70 ℃ for 10-12 minutes, cooling to room temperature, filtering, concentrating under reduced pressure, recrystallizing in absolute ethyl alcohol for 2-3 times, and drying to obtain lauryl succinate; Adding lauryl succinate and 1-hydroxybenzotriazole into an anhydrous dichloromethane solvent, uniformly mixing, adding dicyclohexylcarbodiimide into the solvent at 0-5 ℃, stirring for 20-30min, then dropwise adding 3-aminopropyl triethoxysilane, reacting at room temperature for 18-24h after the dropwise adding is finished, filtering, washing and drying, and distilling under reduced pressure to remove the solvent to obtain lauryl succinate modified silane; Adding ethanol and deionized water into a reactor, mixing to prepare a solvent, regulating the pH of the solvent to 4-5 by using acetic acid, adding nano silicon dioxide, performing ultrasonic treatment for 10-15min, then adding lauryl succinate modified silane into the reactor, stirring and reacting for 4-6h at 30-40 ℃, and after the reaction is finished, performing suction filtration, washing and drying to obtain the modified nano silicon dioxide.
  3. 3. The high-flexibility pressure-resistant rubber hose according to claim 2, wherein the dosage ratio of lauryl alcohol, succinic anhydride, anhydrous sodium acetate and n-hexane in the step one is 4.5-4.6g:2.4-2.5g:0.06-0.07g:5.8-5.9mL.
  4. 4. The high flexible pressure-resistant rubber hose according to claim 2, wherein the ratio of the anhydrous methylene chloride, lauryl succinate, 1-hydroxybenzotriazole, dicyclohexylcarbodiimide and 3-aminopropyl triethoxysilane used in the second step is 60-80ml:2.8-2.9g:1.1-1.2g:1.9-2g:2.2-2.3g.
  5. 5. The high-flexibility pressure-resistant rubber hose according to claim 2, wherein the dosage ratio of ethanol, deionized water, nano-silica and lauryl succinate modified silane in the third step is 80-90ml:9-10ml:1.5-1.6g:1-1.1g.
  6. 6. The high-flexibility pressure-resistant rubber hose according to claim 1, wherein the modified diallyl bisphenol a derivative is prepared by: S1, adding 2,2 '-diallyl bisphenol A and 3-mercapto-2-methyl-valeraldehyde into an N, N-dimethylformamide solvent, uniformly mixing, then adding a photoinitiator 2-hydroxy-4' - (2-hydroxyethoxy) -2-methyl propiophenone, controlling the illumination intensity to be 50-60mW/cm 2 under 365nm ultraviolet light, irradiating for 20-30min at room temperature, filtering, washing and drying to obtain the aldehyde diallyl bisphenol A; S2, adding aldehyde diallyl bisphenol A and o-aminothiophenol into an N, N-dimethylformamide solvent under the protection of nitrogen gas, stirring and mixing, then adding ammonium chloride, reacting for 22-26 hours at 50-60 ℃, filtering, washing and drying after the reaction is finished to obtain benzothiazolyl diallyl bisphenol A; S3, adding benzothiazolyl diallyl bisphenol A into the N, N-dimethylformamide solvent, stirring and dissolving, adding pyridine, dropwise adding triphenylchlorosilane into the system at 0-5 ℃, reacting for 12-14h at 10-20 ℃ after the dropwise adding, adding toluene into the mixture after the reaction is finished, washing the mixture with deionized water for 3-4 times, and distilling the mixture under reduced pressure to obtain the modified diallyl bisphenol A derivative.
  7. 7. The highly flexible pressure-resistant rubber hose according to claim 6, wherein the ratio of N, N-dimethylformamide, 2 '-diallylbisphenol a, 3-mercapto-2-methyl-valeraldehyde, photoinitiator 2-hydroxy-4' - (2-hydroxyethoxy) -2-methylpropionne used in S1 is 40-50ml:3-3.1g:2.9-3g:0.03-0.04g.
  8. 8. The flexible pressure-resistant rubber hose according to claim 6, wherein the ratio of the amount of N, N-dimethylformamide, the aldehyde-formed diallylbisphenol A, the o-aminothiophenol and the ammonium chloride used in S2 is 50 to 60mL, 4.5 to 4.6g, 2.2 to 2.3g, and 0.25 to 0.27g.
  9. 9. The highly flexible pressure-resistant rubber hose according to claim 6, wherein the amount ratio of N, N-dimethylformamide, benzothiazolyldiallyl bisphenol a, pyridine, triphenylchlorosilane, toluene in S3 is 35-45ml:3.3-3.4g:1.4-1.5g:3.6-3.7g:80-100mL.
  10. 10. A method for producing the high-flexibility pressure-resistant rubber hose according to any one of claims 1 to 9, characterized in that the method for producing the high-flexibility pressure-resistant rubber hose comprises: (1) Putting nitrile rubber, carbon black N550, plasticizer DOS, zinc oxide, stearic acid and antioxidant RD into an internal mixer, mixing for 5-8min at 100-120 ℃, discharging rubber, cooling, adding sulfur and accelerator CZ, carrying out thin pass for 5-8 times, and discharging to obtain an inner-layer rubber compound; mixing ethylene propylene diene monomer, modified nano silicon dioxide, modified diallyl bisphenol A derivative, carbon black N550, paraffin oil, zinc oxide, stearic acid and an anti-aging agent RD in an internal mixer at 110-130 ℃ for 6-10min, discharging rubber, cooling, adding sulfur and an accelerator CZ, carrying out thin pass for 5-8 times, and discharging to obtain an outer-layer rubber compound; (2) Putting the inner layer of rubber compound into an extruder, extruding and forming the inner layer of rubber into a tubular inner rubber layer at 70-90 ℃, then adopting a braiding machine to prepare the polyester toughened palm fibers into a tubular framework on the surface of the tubular inner rubber layer, controlling the braiding density to be 80-95%, the braiding angle to be 45-60 ℃, putting the outer layer of rubber compound into the extruder, extruding and coating the outer side of the framework layer at 70-90 ℃, and integrating to obtain a composite hose blank; (3) And (3) conveying the tube blank into vulcanizing equipment, controlling the vulcanizing pressure to be 0.8-1.2MPa, controlling the temperature to be 150-170 ℃, preserving heat and vulcanizing for 25-50min, and cooling after the vulcanizing is finished to obtain the high-flexibility pressure-resistant rubber hose.

Description

High-flexibility pressure-resistant rubber hose and preparation method thereof Technical Field The invention relates to the technical field of rubber hoses, in particular to a high-flexibility pressure-resistant rubber hose and a preparation method thereof. Background The rubber hose has good flexibility, sealing performance and mechanical property, and is widely applied to the fields of petroleum exploitation, engineering machinery, chemical industry transmission and the like and used for conveying media such as hydraulic oil, fuel oil and the like. With the development of modern industrial equipment to high pressure, light weight and compactness, the requirements on the comprehensive performance of the rubber hose are more and more stringent, and the requirements on the pressure resistance, bending flexibility, ageing resistance and interlayer bonding stability of the rubber hose are more and more stringent. In the prior art, rubber hoses are typically composed of an inner layer of rubber, a reinforcing carcass layer, and an outer layer of rubber. However, the conventional rubber hose has the problems of difficult compromise of oil resistance and low-temperature flexibility, easy occurrence of swelling, hardening, cracking and the like during long-term use, influence on sealing and pressure-bearing stability, extremely high rigidity, extremely high overall bending rigidity and poor flexibility of the hose, and difficult meeting the high flexibility installation requirement of a narrow space due to the fact that the reinforced skeleton layer is generally woven by steel wires or wound by steel wires, and the outer rubber layer is easy to crack, pulverize and fall off on the surface under the conditions of long-term thermo-oxidative aging, ozone corrosion and complex dynamic fatigue, so that the skeleton layer is corroded or corroded, and finally the hose is caused to fail. As disclosed in the patent application publication No. CN121086362a, a flame retardant rubber hose including an inner rubber layer, a reinforcing layer and an outer rubber layer, which solves the problems of insufficient mechanical properties and flame retardant properties of the rubber hose in the related art, but has to be improved in pressure resistance and flexibility, and a method for preparing the same. Therefore, developing a rubber hose which can bear high pressure, has higher bursting pressure, and has excellent flexibility, bending fatigue life and ageing resistance is a technical problem to be solved in the current industry. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide the high-flexibility pressure-resistant rubber hose and the preparation method thereof, and the high-flexibility pressure-resistant rubber hose prepared by the invention has good pressure-resistant performance, flexibility and ageing-resistant performance. In order to achieve the aim, the invention provides the technical scheme that the high-flexibility pressure-resistant rubber hose sequentially comprises an inner adhesive layer, a reinforced framework layer and an outer adhesive layer from inside to outside; The inner adhesive layer comprises the following components, by weight, 100 parts of nitrile rubber, 30-40 parts of carbon black N550, 8-12 parts of plasticizer DOS, 4-6 parts of zinc oxide, 1.5-2 parts of sulfur, 1-2 parts of stearic acid, 2-3 parts of antioxidant RD and 1-1.5 parts of accelerator CZ; the reinforced framework layer is formed into a tubular structure by polyester toughened palm fibers through a braiding process; The outer adhesive layer is made of a rubber composition and comprises the following components, by weight, 100 parts of ethylene propylene diene monomer, 20-30 parts of modified nano silicon dioxide, 1-3 parts of modified diallyl bisphenol A derivative, 20-25 parts of carbon black N550, 5-10 parts of paraffin oil, 4-6 parts of zinc oxide, 0.5-1.5 parts of sulfur, 1-1.5 parts of accelerator CZ, 1-2 parts of stearic acid and 2-3 parts of antioxidant RD. Further, the preparation method of the modified nano silicon dioxide comprises the following steps: adding lauryl alcohol, succinic anhydride and anhydrous sodium acetate into a reactor, stirring at 60-70 ℃ for reaction for 3-4 hours, adding n-hexane into the reactor after the reaction is finished, continuously stirring at 60-70 ℃ for 10-12 minutes, cooling to room temperature, filtering, concentrating under reduced pressure, recrystallizing in absolute ethyl alcohol for 2-3 times, and drying to obtain lauryl succinate; in the above steps, hydroxyl of lauryl alcohol is heated and anhydrous sodium acetate is used as a weak alkaline catalyst, carbonyl carbon of succinic anhydride is nucleophilic attacked, the anhydride is ring-opened, an ester bond is formed at one end, and free carboxyl is exposed at the other end, so that lauryl succinate is obtained. Adding lauryl succinate and 1-hydroxybenzotriazole into an anhydrous dichlo