A high performance steel wire rope grease and preparation method thereof

Abstract

The present invention relates to the technical field of C10M169 / 00, and specifically to a high-performance steel wire rope grease and a preparation method thereof. The high-performance steel wire rope grease comprises the following components based on the weight of the high-performance steel wire rope grease: a) 40-85wt% base oil, b) 10-15wt% soap-based thickener, c) 4-8wt% polymer, d) 0-2wt% corrosion inhibitor, e) 1.5-2.5wt% multifunctional additive, f) 1.0-2.5wt% antioxidant; the dropping point of the high-performance steel wire rope grease is not less than 170°C; the oil separation rate of the high-performance steel wire rope grease within 7 days at 100°C is not higher than 5wt%. The high-performance wire rope grease provided by the present invention adopts a mixed soap-based thickener in a specific proportion to replace the use of traditional petroleum waxes such as microcrystalline wax, while effectively avoiding the low-temperature brittle cracking phenomenon of traditional wire rope grease and having good low-temperature performance; in addition, the specific polymer component used in the present application significantly improves the oil separation performance of the wire rope grease through the interaction with components such as compounded cycloalkane base oil and coal-to-oil base oil.

Description

Technical Field

[0001] The invention relates to the technical field of C10M169 / 00, and in particular to a high-performance steel wire rope grease and a preparation method thereof. Background Art

[0002] The working conditions of wire ropes are relatively bad. Usually, they will break or even be scrapped due to corrosion, insufficient lubrication, etc. With the continuous improvement of domestic equipment, the strength of wire ropes is required to be higher and higher, so lubrication is more important and higher requirements are placed on grease. The exposed working environment of wire ropes requires grease to be able to adhere firmly to the surface of the wire rope, have a wide temperature range, a high dropping point and good anti-corrosion performance. However, most of the existing products on the market have a series of thermal stability problems such as low dropping point (mostly below 90°C) and large oil separation, which seriously affects the use of wire rope grease and its service life.

[0003] In view of the above problems, steel wire ropes generally need to be lubricated with grease during use. For example, Chinese patent CN201310478748 discloses a steel wire rope grease composition, in which base oil, microcrystalline wax and other components are used to obtain a grease composition that does not contain volatile solvents and has high permeability and adhesion. Chinese patent CN201610761468 discloses an elevator steel wire rope grease, which also uses base oil, microcrystalline wax, rust inhibitor, nano-silicon dioxide, petroleum barium sulfonate and other components to obtain a grease with good extrusion anti-wear performance and excellent high temperature resistance. Chinese patent CN201110161912 discloses a special grease composition for steel wire ropes, which uses mineral base oil, extracted oil, microcrystalline wax, lithium stearate soap and other components to obtain a lubricant composition with good adhesion and penetration, and also solves the problems of oil throwing, loss and atmospheric pollution of the product.

[0004] However, the above-mentioned traditional wire rope grease often needs to add petroleum wax components such as petroleum wax to adjust its consistency. These components make the grease have a low dropping point and poor high temperature difference resistance, resulting in the dropping point of the wire rope grease commonly used in China being mostly below 90°C. The surface temperature of the wire rope exposed to the sun in summer is relatively high, exceeding the dropping point of the commonly used grease, causing the grease to have obvious oil dripping / oil separation, and the wire rope in use will also have oil throwing. In addition, due to the insufficient ductility of paraffin wax, the grease is prone to brittle cracking and falling off when the temperature is low in winter, and it does not play a protective role. Therefore, there is an urgent need for a high-performance grease to meet actual use needs. Summary of the invention

[0005] In response to the above technical problems, the first aspect of the present invention provides a high-performance wire rope grease, which, based on the weight of the high-performance wire rope grease, includes the following components: a) 40-85wt% base oil, b) 10-15wt% soap-based thickener, c) 4-8wt% polymer, d) 0-2wt% corrosion inhibitor, e) 1.5-2.5wt% multifunctional additive, f) 1.0-2.5wt% antioxidant; the dropping point of the high-performance wire rope grease is not lower than 170°C; the oil separation rate of the high-performance wire rope grease within 7 days at 100°C is not higher than 5wt%.

[0006] The high-performance steel wire rope grease of the present invention comprises 40 to 85 wt% of base oil, based on the weight of the high-performance steel wire rope grease. For example, the content of the base oil may be 40 wt%, 45 wt%, 50 wt%, 53 wt%, 55 wt%, 58 wt%, 60 wt%, 62 wt%, 65 wt%, 68 wt%, 70 wt%, 72 wt%, 75 wt%, 78 wt%, 79 wt%, 80 wt%, 81 wt%, 82 wt%, 84 wt%, 85 wt%, etc. The numerical values ​​and numerical ranges in the present invention include approximate values ​​due to system errors, perceived errors, etc.

[0007] As a preferred technical solution of the present invention, the base oil is a cycloalkyl base oil and / or a coal-to-oil base oil, that is, the base oil in this application can be one of a cycloalkyl base oil or a coal-to-oil base oil, or a mixture of the two. When a mixture of a cycloalkyl base oil and a coal-to-oil base oil is used as the base oil in this application, the mass ratio of the two is not particularly limited, and can be compounded according to actual needs. In some embodiments, the mass ratio of the cycloalkyl base oil and the coal-to-oil base oil is 5: (1-10); for example, the mass ratio of the cycloalkyl base oil and the coal-to-oil base oil can be 1: 1, 1: 1.2, 1: 1.5, 1: 2, 1: 2.5, 1: 3, 1: 3.5, 1: 4, 1: 4.5, 1: 5, 5: 1, 4.5: 1, 4: 1, 3.5: 1, 3: 1, 2.5: 1, 2: 1, 1.5: 1, 1.2: 1, etc.

[0008] As a preferred technical solution of the present invention, the kinematic viscosity of the cycloalkyl base oil at 100°C is 10 to 40 mm 2 / s; Further preferably, the kinematic viscosity of the cycloalkyl base oil at 100°C is 20 to 40 mm 2 / s; Further preferably, the kinematic viscosity of the cycloalkane base oil at 100 ° C is 25 to 35 mm 2 For example, the kinematic viscosity of the naphthenic base oil at 100° C. may be 25 mm 2 / s, 26mm 2 / s, 27mm 2 / s, 28mm 2 / s, 29mm 2 / s, 30mm 2 / s、30.5mm 2 / s、31mm 2 / s、31.1mm 2 / s、31.5mm 2 / s, 32mm 2 / s、33mm 2 / s, 34mm 2 / s, 35mm 2 / s, etc. The term "kinematic viscosity" in the present invention is a physical quantity that measures the magnitude of the internal flow resistance of a fluid under the action of gravity, wherein the kinematic viscosity at 100° C. is obtained by testing according to ASTM D 445 standard.

[0009] Further, the viscosity index of the cycloalkyl base oil is 85 to 105; further preferably, the viscosity index of the cycloalkyl base oil is 90 to 100; for example, the viscosity index of the cycloalkyl base oil can be 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, etc. In the present invention, the term "viscosity index" refers to the degree to which the viscosity of a fluid changes with temperature. The higher the viscosity index, the less the viscosity of the fluid is affected by temperature, and the less sensitive the viscosity is to temperature. It can be obtained by testing according to ASTM D 2270 standard.

[0010] The specific type of the cycloalkyl base oil is not particularly limited in the present invention, and may include but is not limited to 150BS, KN4010, Karamay 4006, Karamay KW68, CROSS B200, NYNAS T22, SAN JOAQUIN N60HT and other cycloalkyl base oils.

[0011] The coal-to-liquid base oil described in the present invention is a hydrocarbon obtained by reacting coal with oxygen and water vapor at high temperature to completely gasify the coal and convert it into a mixture of carbon monoxide, methane and hydrogen, and then synthesizing it under the action of an iron-based or cobalt-based catalyst, and the main component is isoalkanes.

[0012] The specific type of the coal-to-liquid base oil in the present invention is not particularly limited, and may include but is not limited to coal-to-liquid base (CTL 10) base oil and other base oils. Since the base oil has high hydrogenation saturation, small evaporation loss, good thermal stability, low pour point, high viscosity index, low aromatic content, reaching food grade and cosmetic grade, low heavy metal content, almost zero, it can meet the needs of blending high-performance grease.

[0013] In the present invention, by using a compounded cycloalkane base oil and a coal-to-liquid base oil as the base oil of the grease of the present application, the grease has better thermal stability and hydrolysis stability, and at the same time has a lower pour point and a higher viscosity index, which helps to improve the comprehensive performance of the grease in high and low temperature environments.

[0014] The high-performance steel wire rope grease of the present invention comprises 10-15wt% soap-based thickener based on the weight of the high-performance steel wire rope grease. For example, the content of the soap-based thickener may be 10wt%, 10.5wt%, 10.8wt%, 11wt%, 11.5wt%, 11.8wt%, 12wt%, 12.2wt%, 12.5wt%, 12.8wt%, 13wt%, 12.3wt%, 13.5wt%, 13.8wt%, 14wt%, 14.2wt%, 14.5wt%, 14.8wt%, 15wt%, etc.

[0015] The soap-based thickener described in the present invention is a component obtained by reacting an organic acid and a metal compound. As a preferred technical solution of the present invention, the soap-based thickener includes a lithium soap-based thickener and / or a calcium soap-based thickener, that is, the thickener in the present invention can be a lithium soap-based thickener or a calcium soap-based thickener used alone, or the two can be mixed and used. When the thickener of the present invention is a mixture of a lithium soap-based thickener and a calcium soap-based thickener, the mass ratio of the two is not particularly limited, and can be matched according to actual needs.

[0016] In the present invention, there is no special limitation on the metal compound raw materials of the lithium soap-based thickener and the calcium soap-based thickener. The metal compound raw materials (lithium compounds) of the lithium soap-based thickener include but are not limited to LiOH, and the metal compound raw materials (calcium compounds) of the calcium soap-based thickener include but are not limited to Ca(OH)2.

[0017] As a preferred technical solution of the present invention, the raw materials for preparing the soap-based thickener include fatty acids and / or substituted fatty acids, calcium compounds, and lithium compounds; the number of carbon atoms of the fatty acids and / or substituted fatty acids is 12 to 20. Furthermore, the fatty acids and / or substituted fatty acids include but are not limited to stearic acid, oleic acid, 12-hydroxystearic acid, etc. Compared with traditional paraffin wax, the lithium soap-based thickener and calcium soap-based thickener described in the present invention have a higher dropping point, which can reach 240°C, and the operating temperature can be higher, up to 160°C. At the same time, by adopting the above-mentioned specific lithium soap-based thickener and calcium soap-based thickener in this application, the rope grease can also have better high temperature resistance and mechanical stability.

[0018] The high-performance steel wire rope grease of the present invention comprises 4-8wt% of polymer based on the weight of the high-performance steel wire rope grease. For example, the content of the polymer may be 4wt%, 4.2wt%, 4.5wt%, 4.8wt%, 5.0wt%, 5.2wt%, 5.5wt%, 5.8wt%, 6.0wt%, 6.3wt%, 6.5wt%, 6.8wt%, 7.0wt%, 7.5wt%, 7.8wt%, 8.0wt%, etc.

[0019] As a preferred technical solution of the present invention, the polymer includes one or more of polyolefin homopolymers and / or copolymers, acrylate homopolymers and / or copolymers, and polyurethane.

[0020] As a preferred technical solution of the present invention, the polyolefin homopolymer and / or copolymer includes styrene-ethylene-propylene copolymer and / or polyisobutylene; further preferably, the polymer is styrene-ethylene-propylene copolymer and / or polyisobutylene.

[0021] As a preferred technical solution of the present invention, the antioxidant includes an amine antioxidant and / or a phenolic antioxidant. The specific selection of the amine antioxidant in the present invention is not particularly limited, and conventional amine antioxidants in the art can be selected, including but not limited to IRGANOX L 57, irganox L67, irganox L101, etc. The specific selection of the phenolic antioxidant in the present invention is not particularly limited, and conventional phenolic antioxidants in the art can be selected, including but not limited to 2,6-di-tert-butyl-4-methylphenol, etc. In the present application, by adopting the above-mentioned specific antioxidants, utilizing their good high-temperature thermal stability and high-temperature oxidation resistance, as well as good compatibility, it helps to make the high-performance wire rope grease product of the present application have excellent thermal stability.

[0022] As a preferred technical solution of the present invention, the corrosion inhibitor is a sulfonate; the sulfonate includes alkylbenzene sulfonate, alkylnaphthalene sulfonate, substituted alkylbenzene sulfonate, substituted alkylnaphthalene sulfonate. Specifically, the corrosion inhibitor can be TUDASTAR 1030SLACK WAX corrosion inhibitor, etc.

[0023] As a preferred technical solution of the present invention, the multifunctional additive contains an anti-wear agent. Further, the multifunctional additive also contains a rust inhibitor, other antioxidants, etc.; further, the multifunctional additive is obtained by mixing and adjusting the additive components such as anti-wear agent, other antioxidants, and rust inhibitors. For example, the anti-wear agent can be zinc dialkyl dithiophosphate, dialkyl dithiocarbamate, ethoxyamine, fatty acid glyceride, 2,2'-iminobisethanol-N-tallow alkyl derivative and other ingredients; the other antioxidant can be a phosphite antioxidant, etc. In some embodiments, the multifunctional additive of the present invention can be selected from zinc dialkyl dithiophosphate, amine antioxidants, and / or phenolic antioxidants, and / or phosphite antioxidants, sulfonate corrosion inhibitors, etc.

[0024] As a preferred technical solution of the present invention, the dropping point of the high-performance steel wire rope grease is not less than 185°C. The dropping point described in the present invention is an indicator of the temperature resistance performance of the grease, which is used to determine its maximum operating temperature. The dropping point of the high-performance steel wire rope grease in the present invention is preferably not less than 185°C; further, its dropping point is preferably not less than 190°C; further, its dropping point is preferably not less than 195°C. The dropping point described in the present invention is obtained by testing according to the national standard GB / T 4929.

[0025] As a preferred technical solution of the present invention, the oil separation rate of the high-performance steel wire rope grease at 100°C within 24 hours is not higher than 2.5wt%; further preferably, the oil separation rate of the high-performance steel wire rope grease at 100°C within 24 hours is not higher than 0.3wt%; further, the oil separation rate of the high-performance steel wire rope grease at 100°C within 50 hours is not higher than 4.5wt%; further, the oil separation rate of the high-performance steel wire rope grease at 100°C within 50 hours is not higher than 0.5wt%. The oil separation rate described in the present invention refers to the oil separation rate of the steel mesh, which is tested according to the industrial standard SH / T 0324.

[0026] As a preferred technical solution of the present invention, the low-temperature pumping pressure of the high-performance wire rope grease at -20°C is not higher than 600mbar; further, the low-temperature pumping pressure of the high-performance wire rope grease at -20°C is not higher than 500mbar; the low-temperature pumping pressure of the high-performance wire rope grease at -20°C is not higher than 475mbar.

[0027] As a preferred technical solution of the present invention, the low-temperature pumping pressure of the high-performance wire rope grease at -30°C is not higher than 1200mbar; further, the low-temperature pumping pressure of the high-performance wire rope grease at -30°C is not higher than 1150mbar.

[0028] The low-temperature pumping performance of -20°C (-30°C) described in the present invention is a parameter that characterizes whether the grease can still maintain good lubrication performance under low temperature conditions. The above performance in the present invention is obtained by testing according to the German industrial standard DIN 51805.

[0029] A second aspect of the present invention provides a method for preparing the high-performance steel wire rope grease as described above, comprising the following steps:

[0030] Add the required amount of base oil into the reaction kettle, then add the required amount of soap-based thickener and perform saponification treatment at 100-120°C; then heat up to 150-170°C, add the required amount of polymer, then heat up to 190-210°C for thickening treatment, then cool down to 60-80°C, add the remaining raw materials, stir and mix to obtain the high-performance wire rope grease.

[0031] The technical solution provided by the present invention has the following beneficial effects :

[0032] The high-performance wire rope grease provided by the present invention adopts a mixed soap-based thickener in a specific proportion, which replaces the use of traditional petroleum waxes such as microcrystalline wax, and effectively avoids the low-temperature brittle cracking phenomenon of traditional wire rope grease, and has good low-temperature performance; in addition, the specific polymer component used in this application significantly improves the oil separation performance of the wire rope grease under the interaction with the compounded cycloalkyl base oil and coal-to-oil base oil and other components. In addition, in this application, under the interaction between the compounded base oil, the mixed soap-based thickener, the polymer and other components, the wire rope grease product has good thermal stability, which further improves the thermal stability of the product. The combined effect of the above factors makes the product have a longer service life. DETAILED DESCRIPTION

[0033] The following example discloses a high-performance steel wire rope grease, and its formula components and contents are shown in Table 1. The high-performance steel wire rope grease is prepared by the following method:

[0034] Preparation method of wire rope grease: put base oil into the reactor, add the corresponding amount of 12-hydroxystearic acid, mix evenly, and heat to 80-85℃ to dissolve it completely. Add the corresponding amount of Ca(OH)2 and LiOH, mix and heat to 100-120℃ for saponification. After the saponification reaction is complete, heat to 160℃, add the polymer and continue to heat to 200℃ to start thickening, then transfer the reactor. When the temperature drops below 70℃, add the remaining oil and additives to adjust the cone penetration. When the product dropping point and cone penetration are qualified, the product is filtered, homogenized, degassed and packaged.

[0035] Table 1

[0036]

[0037]

[0038] Performance Testing

[0039] The sample performance test standards and test results of the above embodiments are shown in the following table.

[0040] Table 2

[0041]

[0042]

[0043] It can be seen from the above experimental data that the thermal stability and service life of the grease are effectively improved by using specific base oil, thickener, polymer, additives and other components in the present invention.

Claims

1. A high performance wire rope grease, characterized in that: The high-performance steel wire rope lubricating grease is composed of the following components based on the weight of the grease: a) 40-85wt% base oil, b) 10-15wt% soap-based thickener, c) 4-8wt% polymer, d) 1-2wt% corrosion inhibitor, e) 1.0-2.5wt% antioxidant, f) 1.5-2.5wt% multifunctional additive, and the sum of the weight percentages of the above components is 100%; the oil separation rate of the high-performance steel wire rope lubricating grease is not higher than 0.1wt% within 7 days at 100°C; The base oil is a cycloalkyl base oil and a coal-to-liquid base oil, with a mass ratio of 5:(1-10); the kinematic viscosity of the cycloalkyl base oil at 100°C is 25-35 mm 2 / s; The soap-based thickener is a lithium soap-based thickener and a calcium soap-based thickener; The raw materials for preparing the soap-based thickener include fatty acids and / or substituted fatty acids, calcium compounds, and lithium compounds; the number of carbon atoms in the fatty acids and / or substituted fatty acids is 12 to 20; The high polymer is a polyolefin homopolymer and / or copolymer; the polyolefin homopolymer and / or copolymer is a styrene-ethylene-propylene copolymer and / or polyisobutylene; The antioxidant includes an amine antioxidant and / or a phenolic antioxidant; The corrosion inhibitor is equal in mass to succinic acid half ester and paraffin; The dropping point of the high performance wire rope grease is not less than 185°C; The low-temperature pumping pressure of the high-performance wire rope grease at -30°C is not higher than 1200mbar; The multifunctional additive is obtained by blending and adjusting additive components including anti-wear agent, other antioxidants and rust inhibitor.

2. The method for preparing high-performance steel wire rope grease according to claim 1, characterized in that: It includes the following steps: Add the required amount of base oil into the reactor, then add the required amount of soap-based thickener and perform saponification treatment at 100-120°C; then heat up to 150-170°C, add the required amount of polymer, then heat up to 190-210°C for thickening treatment, then cool down to 60-80°C, add the remaining components, stir and mix to obtain the high-performance wire rope grease.

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