Steel wire rope lubricating grease composition as well as preparation method and application thereof

Abstract

The invention provides a steel wire rope lubricating grease composition as well as a preparation method and application thereof, and belongs to the technical field of lubricating grease. The steel wire rope lubricating grease composition comprises the following components in percentage by mass: 30-60% of high-viscosity base oil, 10-35% of low-viscosity base oil, 1-10% of microcrystalline wax, 0.5-10% of a polymer, 1-5% of a softening point improver, 1-10% of a water repellent agent, 1-10% of a metal surface adhesive and 0.1-3% of an antirust agent. The dropping point of the steel wire rope lubricating grease composition reaches 110 DEG C or above, the low-temperature performance reaches-30 DEG C or below, and the steel wire rope lubricating grease composition has the advantages of excellent adhesion, corrosion resistance, heat and humidity resistance, long-term usability and the like, is suitable for protection and lubrication of steel wire ropes in environments with large temperature difference, high salt mist, high heat and humidity and strong corrosion, and has a very good industrial application prospect.

Description

A wire rope lubricating grease composition, its preparation method and application Technical Field

[0001] This invention belongs to the field of lubricating grease technology, and relates to a wire rope lubricating grease composition, its preparation method and application. Background Technology

[0002] Most wire rope greases are hydrocarbon-based greases, mainly made by thickening high-viscosity mineral oil with petroleum grease thickeners such as ceresin and paraffin wax, and adding rust inhibitors. The main disadvantage of this product is its low dropping point, below 60°C. In the high temperatures of summer, the wire rope grease is prone to dripping from the wire rope. In addition, it has poor cold resistance and is prone to cracking and falling off at low temperatures, causing lubrication failure and environmental pollution.

[0003] Chinese invention patent CN104250575B discloses a high-performance wire rope grease composition and its preparation method. The composition consists of: high-viscosity base oil, low-viscosity base oil, microcrystalline wax, polymer A, polymer B, nitrogen-containing compound, extreme pressure anti-wear agent, and rust inhibitor. The resulting product can meet the protection and lubrication requirements of wire ropes in environments ranging from -35°C to 90°C, and has extremely strong high-temperature metal adhesion, water resistance, extreme pressure performance, and rust prevention performance.

[0004] Chinese invention patent application CN110283646A discloses a high-adhesion wire rope grease, comprising the following components: a first base oil, a second base oil, microcrystalline wax, synthetic wax, a thickener, ultra-high alkalinity synthetic calcium sulfonate, acetic acid, 12-hydroxystearic acid, boric acid, calcium hydroxide, and an adhesion promoter. By adjusting the components, a semi-fluid wire rope grease of a specific consistency can be prepared, improving the product's dropping point, adhesion, water resistance, corrosion resistance, and wear resistance.

[0005] The above-mentioned technologies mainly improve the product's dropping point (operating temperature), adhesion, and waterproof and rustproof properties through the use of various additives, but they still have the problem of short service life and cannot meet the needs of wire rope for long-term use in special environments.

[0006] Chinese invention patent application CN110234745A discloses the application of a composite modified grease and a composite calcium sulfonate-based grease in wire rope lubrication, and verifies that it has good low-temperature performance, corrosion resistance, adhesion and anti-wear properties. At the same time, after 1.2 million flipping tests, there was almost no wire breakage or rusting, which significantly improved the service life. However, during the preparation process, the addition of sulfonic acid will cause gelation after a certain period of time. It needs to be carried out under slight overpressure to ensure the reaction rate, and the preparation process is relatively complicated.

[0007] In summary, there is relatively little research on how to improve the service life of wire rope grease in special environments such as large temperature differences, ultra-low temperatures, high salt spray, high humidity and heat, and strong corrosion, so as to improve the bending fatigue life of wire ropes. How to improve the composition and preparation process of grease to give the product good high-temperature adhesion and bonding properties, solve the problems of "cracking" at low temperatures and grease shedding at high temperatures, and improve the corrosion resistance in seawater environment, while improving long service life, is crucial for expanding the application range of grease. Summary of the Invention

[0008] To address the problems existing in the prior art, this invention provides a wire rope lubricating grease composition, its preparation method, and its application. This composition uses base oils of different viscosities, combined with softening point improvers, water-repellent agents, metal surface adhesives, and rust inhibitors. By physically isolating the wire rope from the operating environment, it improves the resistance to chloride ion corrosion. While ensuring the product's low-temperature performance, adhesion, and corrosion and rust prevention properties, it effectively extends its long-term service life, thereby guaranteeing the service life of the wire rope.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows:

[0010] This invention provides a wire rope lubricating grease composition, wherein the wire rope lubricating grease composition comprises, by weight percentage:

[0011]

[0012] Furthermore, the high-viscosity base oil has a kinematic viscosity of 50-80 mmHg at 100°C. 2 / s; The low viscosity base oil has a kinematic viscosity of 20-50 mm at 100℃. 2 / s.

[0013] In this invention, high and low viscosity base oils are used in combination to give the lubricating oil better cooling and lubrication performance. The high viscosity base oil ensures good lubrication performance at both high and low temperatures, while the low viscosity base oil provides better cooling effect. There is no need to use viscosity index improvers. The combination of high and low viscosity base oils adjusts the viscosity-temperature properties of the lubricating oil as a whole, so that it can be used in environments with large temperature differences without affecting its performance.

[0014] Furthermore, the high-viscosity base oil and the low-viscosity base oil are independently selected from one or more of the following: reduced-three-line oil, reduced-four-line oil, extractable oil, and rubber filler oil.

[0015] Furthermore, in this invention, the use of softening point improvers, water-repellent agents, metal surface adhesives, and rust inhibitors, along with the adhesion between the polar amide groups in the metal surface adhesive and the metal surface, enhances the lubricity of the polymer in the wire rope grease, thereby effectively improving low-temperature adhesion. The polymer is also inserted into the interior of the grease and evenly distributed on the wire rope surface, resulting in better lubrication of the contact surface and significantly reducing friction. Additionally, the grease exhibits a brighter color. Through the synergistic effect of the softening point improvers, water-repellent agents, metal surface adhesives, and rust inhibitors, the physical isolation between the wire rope and the environmental medium is achieved, effectively solving the problem of seawater corrosion resistance and improving the bending fatigue resistance of the wire rope.

[0016] Furthermore, the microcrystalline wax is selected from one or more of Fischer-Tropsch synthetic wax and petroleum microcrystalline wax; the dropping melting point is 70-95℃.

[0017] Furthermore, the polymer is selected from one or more of low molecular weight polyethylene propylene rubber, low molecular weight polyisoprene, and low molecular weight polyisobutylene; the melt flow rate is 2.1-5.6 g / 10 min.

[0018] Furthermore, the softening point improver is selected from one or more of calcium stearate, magnesium stearate, zinc stearate, lithium stearate, calcium 12-hydroxystearate, magnesium 12-hydroxystearate, zinc 12-hydroxystearate, and lithium 12-hydroxystearate.

[0019] Preferably, the softening point improver is selected from any two of calcium stearate, magnesium stearate, zinc stearate, lithium stearate, calcium 12-hydroxystearate, magnesium 12-hydroxystearate, zinc 12-hydroxystearate, and lithium 12-hydroxystearate in a ratio of 1:10 to 10:1.

[0020] Furthermore, the water-resistant agent is selected from one or more of polyamide-polyurea-formaldehyde resin, modified amino resin, modified melamine-formaldehyde resin, polyamide-polyurea resin, urea-formaldehyde resin, and asphalt.

[0021] Preferably, the water-resistant agent is selected from any two of polyamide-polyurea formaldehyde resin, modified amino resin, modified melamine-formaldehyde resin, polyamide-polyurea resin, urea-formaldehyde resin, and asphalt, in a ratio of 1:10 to 10:1.

[0022] Furthermore, the metal surface adhesive is selected from one or more of ethylene bisoleamide, stearyl erucamide, stearyl stearamide, ethylene bisstearamide, and palmitamide.

[0023] Preferably, the metal surface adhesive is selected from any two of ethylene bisoleamide, stearic acid erucamide, stearic acid stearamide, ethylene bisstearamide and palmitamide in a ratio of 1:10 to 10:1.

[0024] Furthermore, the rust inhibitor is selected from two or more of the following: polyurethane polyacrylate, triethanolamine borate, barium petroleum sulfonate, alkyl phosphate imidazoline salt, and modified thiadiazole derivative.

[0025] Preferably, the rust inhibitor is selected from any two of the following: polyurethane polyacrylate, triethanolamine borate, barium petroleum sulfonate, alkyl phosphate imidazoline salt, and modified thiadiazole derivative, in a ratio of 1:10 to 10:1.

[0026] The present invention also provides a method for preparing any of the above-described wire rope lubricating grease compositions, comprising the following steps:

[0027] (1) Add high-viscosity base oil and low-viscosity base oil to the reactor and heat it up;

[0028] (2) Add the polymer, softening point improver, water-resistant agent and metal surface adhesive, and stir to react;

[0029] (3) Cool down for the first time, add microcrystalline wax, and continue stirring to react;

[0030] (4) Cool down for the second time, add rust inhibitor, and continue stirring to react, and the product is obtained.

[0031] Furthermore, the heating temperature is 140-150℃.

[0032] Furthermore, the first cooling temperature is 120-130℃.

[0033] Furthermore, the second cooling temperature is 90-100℃.

[0034] Furthermore, in steps (2)-(4), the stirring reaction time is 1-2 hours.

[0035] The present invention also provides the application of the wire rope grease composition described above or the wire rope grease composition prepared by any of the preparation methods described above in wire ropes in environments with large temperature differences, high salt spray, high humidity and heat and strong corrosion.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The present invention uses high viscosity base oil and low viscosity base oil in combination to provide a suitable viscosity base for wire rope lubricating grease and ensure the overall adhesion during use;

[0038] (2) In addition, with the combined use of additives such as softening point improvers, water-resistant agents, metal surface adhesives and rust inhibitors, the steel wire rope is physically isolated from the environmental medium, which effectively solves the problem of seawater corrosion resistance and improves the bending fatigue performance of the steel wire rope.

[0039] (3) The wire rope lubricating grease of the present invention adopts a two-step thickening process. Compared with the existing technology, the high viscosity base oil and low viscosity base oil do not need to be added separately during the preparation process, and the process is simpler.

[0040] (4) The wire rope grease provided by this invention has a dropping point of over 110°C, an adhesion of 100%, a softening point of over 85°C, seawater salt spray resistance of Class A and over 15 days, and a bending fatigue life of over 1 million cycles. It is particularly suitable for the initial lubrication of wires, strands and cores in the production process of wire ropes for marine engineering and port environments, breaking the monopoly of foreign countries in the field of high-end wire rope grease. Attached Figure Description

[0041] Figure 1 is a comparison of the fatigue test results of the present invention and the imported high-end steel wire rope of Comparative Example 1. Detailed Implementation

[0042] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions were applied in the examples. Reagents or instruments used, unless otherwise specified, are all commercially available products.

[0043] Example 1

[0044] 510 kg of oil was extracted (viscosity at 100℃: 68 mm). 2 / s) and 300kg of reduced-density three-line oil (viscosity 40mm at 100℃) 2 The mixture is added to a reactor and heated to 140°C. 10 kg of low molecular weight polyethylene propylene rubber (molecular weight approximately 50,000; melt flow rate 4.2 g / 10 min), 50 kg of modified amino resin, 8 kg of calcium stearate, and 10 kg of ethylene bisoleic acid amide are added and stirred for 2 hours. The temperature is then lowered to 120-130°C, and 30 kg of petroleum microcrystalline wax is added and stirred for 2 hours at a stirring speed of 200-400 r / min. The temperature is then lowered to 90-100°C, and 5 kg of barium petroleum sulfonate and 10 kg of triethanolamine borate are added. After stirring at a constant temperature for 1 hour, the mixture is removed from the reactor and filled into the finished product.

[0045] Example 2

[0046] Extract 600 kg of oil (viscosity 68 mm at 100℃). 2 / s) and 340kg of reduced-density three-line oil (viscosity of 40mm at 100℃) 2 The mixture is added to a reactor, heated to 140°C, and 15 kg of low molecular weight polyethylene propylene rubber (molecular weight approximately 50,000; melt flow rate 4.2 g / 10 min) and 60 kg of urea-formaldehyde resin, 12 kg of magnesium stearate, and 14 kg of ethylene bis-stearamide are added. The mixture is stirred for 2 hours. The temperature is then lowered to 120-130°C, and 35 kg of petroleum microcrystalline wax is added. The mixture is stirred for 2 hours at a stirring speed of 200-400 r / min. The temperature is then lowered to 90-100°C, and 6 kg of barium petroleum sulfonate and 10 kg of triethanolamine borate are added. The mixture is stirred at a constant temperature for 1 hour, and then discharged from the reactor and packaged into the finished product.

[0047] Example 3

[0048] 770 kg of oil was extracted (viscosity at 100℃: 68 mm). 2 / s) and 380kg of reduced-density three-line oil (viscosity of 40mm at 100℃) 2 / s) Add oil to the reactor, heat to 140℃, add 15kg of low molecular weight polyethylene propylene rubber (molecular weight approximately 50,000; melt flow rate 4.2g / 10min) and 60kg of polyamide-polyurea resin, 10kg of 12-hydroxystearic acid magnesium, and 14kg of stearamide stearate, and stir for 2 hours; cool to 120-130℃, add 35kg of petroleum microcrystalline wax, and stir for 2 hours, maintaining a stirring speed of 200-400r / min; cool to 90-100℃, add 8kg of petroleum sulfonate barium and 14kg of triethanolamine borate, stir at a constant temperature for 1 hour, and then remove from the reactor and fill into the finished product.

[0049] Comparative Example 1

[0050] Using a high-end imported steel wire rope grease as a comparison, the formula consists of 50-70% high-viscosity mineral oil, 20-25% petroleum wax paste, 3-5% waterproofing agent, and 2-6% rust-preventive additive.

[0051] The performance of the finished products of the comparative examples in the above embodiments was characterized, and the statistical results are shown in Table 1.

[0052] Table 1. Performance Characterization Results of Finished Products

[0053]

[0054]

[0055] As can be seen from the table above, the wire rope lubricating grease composition provided by the present invention has the following advantages:

[0056] (1) Wide operating temperature range, with a base oil pour point below -25℃ and a dropping point above 110℃, ensuring that the product will not slip, sludge, or crack when the operating temperature is between -30℃ and 90℃.

[0057] (2) Good high-temperature adhesion, the drop test temperature meets the requirement of "non-slip on all six sides" at 65℃;

[0058] (3) Good film-forming properties ensure the product’s excellent water resistance and corrosion resistance. It can instantly form a solidified film on the surface of the wire rope, ensuring the physical isolation between the wire rope and the environment.

[0059] (4) Excellent seawater rust prevention performance, achieving Grade A in both 15-day salt spray test and 40-day damp heat test;

[0060] (5) The use of high-viscosity base oil, special thickener, metal surface adhesion agent and softening point improver ensures that the product has an ultra-long wire rope fatigue life without grease leakage at high temperature. On a 46mm rope, under a load of 260 kg, the number of reciprocating bending fatigue cycles reaches more than 1 million, and the wire rope remains intact. In contrast, the imported high-end wire rope lubricant provided in the comparison sample has a large number of broken wires after 1 million reciprocating bending fatigue cycles. The fatigue test comparison effect is shown in Figure 1.

[0061] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A wire rope lubricating grease composition, characterized in that, The wire rope lubricating grease composition comprises, by weight percentage:

2. The wire rope lubricating grease composition according to claim 1, characterized in that, The high-viscosity base oil has a kinematic viscosity of 50-80 mmHg at 100°C. 2 / s; The low viscosity base oil has a kinematic viscosity of 20-50 mm at 100℃. 2 / s.

3. The wire rope lubricating grease composition according to claim 1, characterized in that, The high-viscosity base oil and the low-viscosity base oil are independently selected from one or more of the following: reduced-three-line oil, reduced-four-line oil, extractable oil, and rubber filler oil.

4. The wire rope lubricating grease composition according to claim 1, characterized in that, The microcrystalline wax is selected from one or more of Fischer-Tropsch synthetic wax and petroleum microcrystalline wax; the dropping melting point is 70-95℃.

5. The wire rope lubricating grease composition according to claim 1, characterized in that, The polymer is selected from one or more of low molecular weight polyethylene propylene rubber, low molecular weight polyisoprene and low molecular weight polyisobutylene; the melt flow rate is 2.1-5.6 g / 10 min.

6. The wire rope lubricating grease composition according to claim 1, characterized in that, The softening point improver is selected from one or more of calcium stearate, magnesium stearate, zinc stearate, lithium stearate, 12-hydroxycalcium stearate, 12-hydroxymagnesium stearate, 12-hydroxyzinc stearate, and 12-hydroxylithium stearate; the water-resistant agent is selected from one or more of polyamide polyurea formaldehyde resin, modified amino resin, modified melamine formaldehyde resin, polyamide polyurea resin, urea-formaldehyde resin, and asphalt; the metal surface adhesive is selected from one or more of ethylene bisoleamide, stearyl erucamide, stearyl stearamide, ethylene bisstearamide, and palmitamide; the rust inhibitor is selected from two or more of polyacrylate, triethanolamine borate, barium petroleum sulfonate, alkyl phosphate imidazoline salt, and modified thiadiazole derivatives.

7. The wire rope lubricating grease composition according to claim 6, characterized in that, The softening point improver is selected from any two of calcium stearate, magnesium stearate, zinc stearate, lithium stearate, calcium 12-hydroxystearate, magnesium 12-hydroxystearate, zinc 12-hydroxystearate, and lithium 12-hydroxystearate in a ratio of 1:10 to 10:1; the water-resistant agent is selected from any two of polyamide-polyurea-formaldehyde resin, modified amino resin, modified melamine-formaldehyde resin, polyamide-polyurea resin, urea-formaldehyde resin, and asphalt in a ratio of 1:10 to 10:1; the metal surface adhesive is selected from any two of ethylene bisoleamide, stearic acid erucamide, stearic acid stearamide, ethylene bisstearamide, and palmitamide in a ratio of 1:10 to 10:1; the rust inhibitor is selected from any two of polyacrylate, triethanolamine borate, barium petroleum sulfonate, alkyl phosphate imidazoline salt, and modified thiadiazole derivative in a ratio of 1:10 to 10:

1.

8. The method for preparing the wire rope lubricating grease composition according to any one of claims 1-7, characterized in that, Includes the following steps: (1) Add high viscosity base oil and low viscosity base oil to the reactor and heat up; (2) Add polymer, softening point improver, water repellent and metal surface adhesive and stir to react; (3) Cool down for the first time, add microcrystalline wax and continue to stir to react; (4) Cool down for the second time, add rust inhibitor and continue to stir to react, and the product is obtained.

9. The preparation method according to claim 8, characterized in that, The heating temperature is 140-150℃; the first cooling temperature is 120-130℃; the second cooling temperature is 90-100℃; in steps (2)-(4), the stirring reaction time is 1-2h.

10. The application of the wire rope grease composition according to any one of claims 1-7 or the wire rope grease composition prepared by the preparation method according to claim 8 or 9 in wire ropes in environments with large temperature differences, high salt spray, high humidity and heat and strong corrosion.

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