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CN-121975566-A - High-viscosity antioxidant industrial gear oil composition and preparation method thereof

CN121975566ACN 121975566 ACN121975566 ACN 121975566ACN-121975566-A

Abstract

The invention provides a high-viscosity antioxidant industrial gear oil composition, a preparation method and application thereof, wherein the composition comprises, by weight, 97 parts of base oil, 2.5-3 parts of complexing agent and 0.01-0.05 part of defoamer, and the base oil comprises, by weight, 55-70% of PAO150 base oil, 15-25% of PAO6 base oil and 12-20% of total synthetic alkyl naphthalene base oil based on the total mass of the base oil. The high-viscosity antioxidant industrial gear oil composition has the characteristics of low pour point, high viscosity index, good oxidation resistance and the like, and has low preparation cost and higher economic benefit.

Inventors

  • LI JIUSHENG
  • ZHAO ZHANGYOU
  • GU CIBING
  • Lv Zerong
  • HOU HAO
  • LIAO TINGJUN
  • ZHANG ZHAOJUN
  • FU LICAI
  • GUO CHUNJIAN
  • TIAN JUN
  • ZHU DELIN

Assignees

  • 中国科学院上海高等研究院
  • 四川泸天化股份有限公司

Dates

Publication Date
20260505
Application Date
20260316

Claims (10)

  1. 1. A high-viscosity antioxidant industrial gear oil composition is characterized by comprising 97 parts by weight of base oil, 1-5 parts by weight of complexing agent and 0.01-0.05 part by weight of defoamer; Based on the total mass of the base oil, the base oil comprises 55-70wt% of PAO150 base oil, 15-25wt% of PAO6 base oil and 12-20wt% of fully synthetic alkyl naphthalene base oil, wherein the kinematic viscosity of the fully synthetic alkyl naphthalene base oil at 100 ℃ is 5-15 mm 2 /s.
  2. 2. The high-viscosity antioxidant industrial gear oil composition according to claim 1, wherein the total synthetic alkyl naphthalene base oil is prepared by mixing naphthalene with alpha-olefin, performing Friedel-crafts alkylation reaction under the action of a catalyst of a modified Y-type molecular sieve to obtain long-chain alkyl naphthalene, wherein the modified Y-type molecular sieve is prepared by treating the Y-type molecular sieve with an ammonium compound aqueous solution or an oxalic acid solution, and drying and calcining.
  3. 3. The high viscosity antioxidant industrial gear oil composition of claim 2, comprising one or more of the following features: The Y-type molecular sieve is an ultrastable Y; the alpha-olefin is selected from one or more of 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene and 1-octadecene; The content of the linear olefin in the alpha-olefin is 92-98 wt%; The molar ratio of naphthalene to alpha-olefin is 1:1-4; The dosage of the catalyst is 3-20wt% of the total mass of naphthalene and alpha-olefin; The Friedel-crafts alkylation reaction also adopts saturated alkane solvent; the reaction temperature is 150-190 ℃; the reaction time is at least 6 hours.
  4. 4. A high viscosity antioxidant industrial gear oil composition according to claim 3, comprising one or more of the following features: the silicon-aluminum ratio of the ultra-stable Y molecular sieve is 8-11; The addition amount of the saturated alkane is 30-50wt% of the total mass of naphthalene and alpha-olefin; the number of C saturated alkane is 10-14; The volume ratio of the Y-type molecular sieve to the ammonium compound is 1:0.8-1.2; the concentration of the ammonium compound aqueous solution is 0.1-2 mol/L; Adopting an ammonium compound aqueous solution to treat for at least 8 hours; the drying temperature is 40-100 ℃; the calcining temperature is 500-600 ℃; the ammonium compound is selected from one or more of ammonium oxalate and ammonium nitrate.
  5. 5. The high viscosity antioxidant industrial gear oil composition of claim 1, wherein the feedstock ultrastable Y molecular sieve comprises one or more of the following characteristics: The specific surface area of the raw material ultra-stable Y molecular sieve is 500-600 m 2 /g; The total pore volume of the raw material ultra-stable Y molecular sieve is 0.35-0.38 m 3 /g; The total acid value of the raw material ultra-stable Y molecular sieve is 100-110 a.u.
  6. 6. The high viscosity antioxidant industrial gear oil composition of claim 1, comprising one or more of the following features: The defoamer comprises one or more selected from HL933S and Foam ban 149; the complexing agent is HiTEC 307 industrial gear oil complexing agent; The kinematic viscosity of the fully synthesized alkyl naphthalene base oil at 100 ℃ is 5-12 mm 2 /s.
  7. 7. The high-viscosity antioxidant industrial gear oil composition according to claim 6, wherein the defoamer comprises a mixture of HL933S and Foam ban 149, and the mass ratio of HL933S to Foam ban 149 is 1:0.8-1.2.
  8. 8. The high viscosity antioxidant industrial gear oil composition of claim 1, further comprising one or more of the following features: the kinematic viscosity at 40 ℃ is 320-350 mm 2 /s; The kinematic viscosity at 100 ℃ is 50-60 mm 2 /s; The pour point is-50 to-45 ℃; the acid value is 0.2-0.25 mgKOH/g.
  9. 9. A method for preparing the high-viscosity antioxidant industrial gear oil composition according to any one of claims 1 to 8, which comprises the steps of mixing base oil, adding and mixing an antifoaming agent and a complexing agent.
  10. 10. The use of the high-viscosity antioxidant industrial gear oil composition according to any one of claims 1 to 8 for lubricating oil of industrial gears under high-temperature and high-load working conditions, wherein the high temperature is 80 to 120 ℃, the high load is the maximum seizure-free load of 171 to 250kgf, and the sintering load is 191 to 298 kgf.

Description

High-viscosity antioxidant industrial gear oil composition and preparation method thereof Technical Field The invention relates to the technical field of lubricating oil, in particular to a high-viscosity antioxidant industrial gear oil composition and a preparation method thereof. Background Industrial gear oil is used as a key lubricating medium of a mechanical equipment transmission system and plays important roles of reducing abrasion, heat dissipation, rust prevention and power transmission. With the development of industrial equipment to large-scale, heavy-duty and continuous, the performance requirements on gear oil are increasingly improved, and particularly, stronger oxidation resistance is required under the conditions of high temperature, heavy-duty, long-term operation and the like. The gear oil bears extremely high contact pressure in the gear meshing area, the local temperature can exceed 150 ℃, and under the combined action of metal catalysis, moisture, air and other factors, the oil is extremely easy to undergo oxidation reaction, and acidic substances, oil sludge and paint films are generated. These oxidation products can accelerate equipment wear, block oil circuit, reduce heat dissipation efficiency, lead to gear pitting, gluing and even tooth breakage in serious cases, cause equipment to stop unplanned, and bring about huge economic loss. The above-mentioned conditions require that the high-viscosity industrial gear oil not only have excellent extreme pressure wear resistance, rust and corrosion resistance, anti-foaming property, water separation property and other conventional properties, but also have high-temperature oxidation stability, dispersibility of oxidation products and long-term service life as important performance indexes. At present, industrial gear oil in the market mostly adopts mineral base oil or partial synthetic oil, and the antioxidant capacity is improved by increasing the content of antioxidants such as phenols, amines and the like. However, because mineral oil itself contains polyunsaturated hydrocarbon and impurities, under the conditions of high temperature and high load, even if the dosage of the antioxidant is greatly increased, the excessive antioxidant is difficult to effectively inhibit the generation of a large amount of oil sludge, and simultaneously can antagonize other additives to reduce extreme pressure antiwear performance, promote the formation of a paint film even under certain working conditions, so that the problem of long service life of the high-viscosity gear oil under severe working conditions can not be fundamentally solved. Therefore, development of a high-viscosity antioxidant industrial gear oil is necessary. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a high-viscosity antioxidant industrial gear oil composition and a preparation method thereof, which are used for solving the problem of insufficient performance caused by the fact that the existing industrial gear oil depends on imported base oil as a raw material. To achieve the above and other related objects, the present invention is achieved by comprising the following technical solutions. The target industrial gear oil of the present application has a kinematic viscosity of about 320mm 2/s at 40 ℃, such as an industrial gear oil in a range that can float up and down by 10% at 320mm 2/s. The invention provides an antioxidant high-viscosity industrial gear oil by adopting alkyl naphthalene synthetic base oil, and the oil has high viscosity index and high-temperature oxidation stability. The invention provides a high-viscosity antioxidant industrial gear oil composition, which comprises 97 parts by weight of base oil, 1-5 parts by weight of complexing agent and 0.01-0.05 part by weight of defoamer. The complexing agent is 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight and 5 parts by weight. Preferably, the complexing agent is 2.5-3 parts. The defoamer is 0.01 part by weight, 0.02 part by weight, 0.03 part by weight, 0.04 part by weight and 0.05 part by weight. Preferably, the base oil comprises 55-70wt% of PAO150 base oil, 15-25wt% of PAO6 base oil and 12-20wt% of fully synthetic alkyl naphthalene base oil based on the total mass of the base oil. More preferably, the PAO150 base oil may be 55wt%, 58wt%, 60wt%, 62wt%, 65wt%, 68wt%, 70wt%. More preferably, the PAO6 base oil may be 15wt%, 17wt%, 20wt%, 22wt%, 25wt%. More preferably, the fully synthetic alkyl naphthalene base oil may be 12wt%, 15wt%, 17wt%, or 20wt%. Preferably, the kinematic viscosity of the fully synthesized alkyl naphthalene base oil at 100 ℃ is 5-15 mm 2/s. More preferably, the kinematic viscosity of the fully synthesized alkyl naphthalene base oil at 100 ℃ is 5-12 mm 2/s, such as 5mm 2/s (AN 5 for short), 6mm 2/s (AN 6 for short), 7 mm 2/s (AN 7 for short), 8 mm 2/s (AN 8 for short), 9 mm 2/s (AN 9 for sho