Barium-free lubricating and rust-preventing oil for chains

Abstract

This invention relates to a barium-free lubricating and rust-preventing oil for chains, comprising, by weight percentage: 10%-25% composite barium-free rust inhibitor, 1.5%-3.5% extreme pressure anti-wear agent, 1%-3% oiliness agent, 1%-3% film-forming agent, 1%-3% adhesion modifier, 2%-4% thixotropic agent, 0.5%-1.5% antioxidant, 0.03%-0.1% copper corrosion inhibitor, 1%-3% dehydrating agent, with the balance being biodegradable base oil raw material components. This invention does not contain the heavy metal barium, and the base oil is a biodegradable synthetic ester base oil, reducing the risk of environmental pollution caused by the rust-preventing oil spilling. It has good resistance to damp heat and salt spray, excellent lubrication performance, strong adhesion, and a certain degree of thixotropy, enabling it to quickly form a thin and stable oil film on the chain surface without dripping, reducing oil loss. It is suitable for lubrication and rust prevention during the operation of various chains, as well as for medium- and long-term rust prevention during storage and transportation.

Description

Technical Field

[0001] This invention belongs to the field of rust-preventive oil technology, and relates to a barium-free lubricating rust-preventive oil for chains. Background Technology

[0002] As a common mechanical transmission component, chains operate in an open atmospheric environment, and chain oil provides both rust prevention and lubrication. However, at high speeds, the lubricating oil is easily shed; at low speeds, it drips or leaks due to gravity. Therefore, rust-preventive lubricating oil must have excellent adhesion, firmly adhering to the chain's friction surfaces and not detaching due to various physical forces.

[0003] Furthermore, chain oil is an open-type consumable lubricant, meaning that almost all of it is lost to the surrounding environment after use. Under the previous extensive development model, its ecological impact did not attract much attention due to its small usage. However, in the current context of ecological civilization construction, while traditional oil-soluble barium salt rust inhibitors offer excellent rust prevention and are reasonably priced, they slowly decompose into toxic soluble barium salts when released into the natural environment, posing a potentially serious threat to the environment and human health. Moreover, traditional rust-preventive oils mostly use non-biodegradable mineral-based base oils, which have poor biodegradability. When they spill onto the ground or enter water, they gradually accumulate to form persistent hydrocarbons, directly polluting soil and water.

[0004] Most existing chain lubricating and rust-preventing oils are barium-containing products. Even some barium-free products either have short rust-preventing periods or lack sufficient rust-preventing data to support their performance characteristics. They may also use non-environmentally friendly rust inhibitors such as nitrites and recalcitrant mineral-based base oils, thus lacking environmental friendliness. There is an urgent need for a barium-free, biodegradable, environmentally friendly chain lubricating and rust-preventing oil with excellent rust prevention, lubrication, and adhesion properties. Summary of the Invention

[0005] The purpose of this invention is to provide a barium-free lubricating and rust-preventing oil for chains, which has good adhesion and is biodegradable.

[0006] The technical solution adopted in this invention is a barium-free lubricating and rust-preventing oil for chains, which is composed of the following components by mass percentage: 10%-25% composite barium-free rust inhibitor, 1.5%-3.5% extreme pressure anti-wear agent, 1%-3% oiliness agent, 1%-3% film-forming agent, 1%-3% adhesion modifier, 2%-4% thixotropic agent, 0.5%-1.5% antioxidant, 0.03%-0.1% copper corrosion inhibitor, 1%-3% dehydrating agent, and the balance being biodegradable base oil.

[0007] The present invention is further characterized in that: the composite barium-free rust inhibitor is composed of the following components by mass percentage: 20%-30% calcium petroleum sulfonate, 40%-50% dinonylnaphthalene sulfonate calcium, 5%-10% imidazoline amide type corrosion inhibitor, and 10%-35% other rust inhibitors, and the sum of the mass percentages of the above components is 100%.

[0008] Other rust inhibitors include any one or a combination of sodium petroleum sulfonate, dodecenyl succinic acid, dimer acid, dodecenyl succinate half ester, zinc naphthenate, N-oleoyl sarcosine, N-oleoyl sarcosine octadecylamine salt, heptadecanyl imidazoline enyl succinate, heptadecanyl hydroxyethyl imidazoline, heptadecanyl hydroxyethyl imidazoline, tallyl hydroxyethyl imidazoline, and heptadecanyl aminoethyl imidazoline.

[0009] The general structural formula of imidazoline amide type corrosion inhibitors is:

[0010]

[0011] Where R is a C10 to C21 straight or branched hydrocarbon group, and n is an integer from 0 to 2;

[0012] Extreme pressure anti-wear agents are sulfur-containing anti-wear agents and neutral phosphate esters; sulfur-containing anti-wear agents are sulfurized fatty acid esters or alkyl polysulfides; neutral phosphate esters are isopropylated triphenyl phosphate or tert-butylated triphenyl phosphate;

[0013] The oiling agent is any one or a combination of several of the following: polylactone castor oil, polylactone 12-hydroxystearate, dimer ester, and trimer ester.

[0014] The film-forming agent is any one or a combination of several of the following: petrolatum, oxidized wax ester, oxidized petroleum grease, oxidized petroleum grease calcium soap, lanolin, lanolin magnesium soap, lanolin calcium soap, and lanolin fatty acid pentaerythritol ester.

[0015] The adhesion modifier is a composite ester with a molecular weight of 17,000 Da-22,000 Da; the thixotropic agent is any one or a combination of hydrogenated castor oil, modified hydrogenated castor oil, and aluminum distearate.

[0016] The antioxidant is any one or a combination of several of the following: 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-p-(dimethylaminomethyl)phenol, N-phenyl-α-naphthylamine, N,N-di-sec-butyl-p-phenylenediamine, butyl-octyl diphenylamine, dioctyl diphenylamine, and dinonyl diphenylamine.

[0017] The copper corrosion inhibitor is any one or a combination of several of benzotriazole, methylbenzotriazole, benzotriazole Mannich condensate, methylbenzotriazole Mannich condensate, and thiadiazole derivatives;

[0018] The dehydrating agent is any one or a combination of several of diethylene glycol monobutyl ether, 3-methoxy-3-methyl-1-butanol, and fatty alcohol polyoxyethylene ether;

[0019] Biodegradable base oil has a kinematic viscosity of 200 mmHg at 40°C. 2 / s-500mm 2 Synthetic ester base oils with a biodegradability rate greater than 60% per second.

[0020] The beneficial effects of this invention are:

[0021] (1) The chain-free lubricating rust-preventing oil of the present invention does not contain heavy metal barium (barium content is less than 10ppm), which meets the environmental protection requirements of foreign environmental regulations that the rust-preventing materials used in exported metal products must not contain barium. In addition, the base oil is selected as a biodegradable synthetic ester base oil, which significantly reduces the risk of pollution to the surrounding environment caused by the rust-preventing oil spilling, and has substantial environmental protection characteristics.

[0022] (2) The barium-free lubricating and rust-preventing oil for chains of the present invention has good resistance to damp heat and salt spray, good lubrication performance, strong adhesion, and certain thixotropic properties. It can quickly form a thin and stable oil film on the chain surface without flowing, reducing oil loss. It is suitable for lubrication and rust prevention during the operation of various chains as well as for medium and long-term sealing and rust prevention during storage and transportation. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments.

[0024] The barium-free lubricating and rust-preventing oil for chains of the present invention is composed of the following raw material components by weight percentage:

[0025] The compound barium-free rust inhibitor consists of 10%-25%, extreme pressure anti-wear agent 1.5%-3.5%, oiliness agent 1%-3%, film-forming agent 1%-3%, adhesion modifier 1%-3%, thixotropic agent 2%-4%, antioxidant 0.5%-1.5%, copper corrosion inhibitor 0.03%-0.1%, dehydrating agent 1%-3%, and the balance is biodegradable base oil.

[0026] Furthermore, the barium-free lubricating and rust-preventing oil for chains of the present invention comprises a composite barium-free rust inhibitor including calcium petroleum sulfonate, calcium dinonylnaphthalene sulfonate, and an imidazoline amide type corrosion inhibitor as shown in (1):

[0027]

[0028] In formula (1), R is a C10-C21 straight or branched hydrocarbon group, and n is an integer from 0 to 2. This type of imidazoline amide corrosion inhibitor contains a unique imidazoline five-membered ring, whose nitrogen atoms can form coordinate bonds with the empty d orbitals on the metal surface, thereby forming a strong monomolecular adsorption film on the metal surface; its unique imidazoline five-membered ring can also change the charge distribution and redox potential of hydrogen ions on the metal surface; and the nonpolar alkyl chain R forms a hydrophobic layer, preventing the corrosive medium from entering the metal surface. Therefore, the imidazoline amide corrosion inhibitor shown in formula I has excellent corrosion inhibition effect on ferrous metals.

[0029] Composite barium-free rust inhibitors also include calcium petroleum sulfonate, calcium dinonylnaphthalene sulfonate, imidazoline amide type corrosion inhibitors, and other rust inhibitors.

[0030] Other rust inhibitors include any one or a combination of several of the following: sodium petroleum sulfonate, dodecenyl succinic acid, dimer acid, dodecenyl succinic acid half ester, zinc naphthenate, N-oleoyl sarcosine, N-oleoyl sarcosine octadecylamine salt, heptadecanyl imidazoline enyl succinate, heptadecanyl hydroxyethyl imidazoline, heptadecanyl hydroxyethyl imidazoline, tallyl hydroxyethyl imidazoline, and heptadecanyl aminoethyl imidazoline.

[0031] The total weight of the composite barium-free rust inhibitor is 100%. In the composite barium-free rust inhibitor, calcium petroleum sulfonate preferably accounts for 20-30%, calcium dinonylnaphthalene sulfonate preferably accounts for 40-50%, imidazoline amide type corrosion inhibitor preferably accounts for 5-10%, and other rust inhibitors preferably account for 10-35%.

[0032] The preferred extreme pressure anti-wear agent is a sulfur-containing extreme pressure anti-wear agent and a neutral phosphate ester;

[0033] Sulfur-containing extreme pressure anti-wear agents are sulfurized fatty acid esters or alkyl polysulfides;

[0034] The neutral phosphate ester is isopropylated triphenyl phosphate or tert-butylated triphenyl phosphate.

[0035] The oiling agent is preferably any one or more of castor oil polylactone, 12-hydroxystearic acid polylactone, dimer ester, and trimer ester.

[0036] The film-forming agent is preferably any one or more of petrolatum, oxidized wax ester, oxidized petroleum grease, oxidized petroleum grease calcium soap, lanolin, lanolin magnesium soap, lanolin calcium soap, and lanolin fatty acid pentaerythritol ester.

[0037] The adhesion improver is preferably a composite ester with a molecular weight of 17,000 Da to 22,000 Da.

[0038] The thixotropic agent is preferably any one or more of hydrogenated castor oil, modified hydrogenated castor oil, and aluminum distearate.

[0039] The antioxidant is preferably any one or more of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-p-(dimethylaminomethyl)phenol, N-phenyl-α-naphthylamine, N,N-di-sec-butyl-p-phenylenediamine, butyl-octyl-diphenylamine, dioctyl-diphenylamine, and dinonyl-diphenylamine.

[0040] The preferred copper corrosion inhibitor is any one or more of benzotriazole, methylbenzotriazole, benzotriazole Mannich condensate, methylbenzotriazole Mannich condensate, and thiadiazole derivatives.

[0041] The dehydrating agent is preferably any one or more of diethylene glycol monobutyl ether, 3-methoxy-3-methyl-1-butanol, and fatty alcohol polyoxyethylene ether.

[0042] Biodegradable base oil is preferably with a kinematic viscosity of 200 mmHg at 40°C. 2 / s-500mm 2 / s of biodegradable synthetic ester base oils.

[0043] The method for preparing the barium-free lubricating and rust-preventing oil for chains of the present invention is as follows: 10%-25% of a composite barium-free rust inhibitor, 1.5%-3.5% of an extreme pressure anti-wear agent, 1%-3% of an oiliness agent, 1%-3% of a film-forming agent, 1%-3% of an adhesion modifier, 2%-4% of a thixotropic agent, 0.5%-1.5% of an antioxidant, 0.03%-0.1% of a copper corrosion inhibitor, and 1%-3% of a dehydrating agent are added to a mixing vessel in a single step, with the remainder being components of a biodegradable base oil. The mixture is stirred thoroughly at room temperature until the composition is uniformly mixed to obtain the barium-free lubricating and rust-preventing oil for chains.

[0044] The present invention will be further illustrated below through examples and experimental verification.

[0045] Example 1:

[0046] The components and contents of the barium-free lubricating and rust-preventing oil for chains provided in this embodiment are shown in Table 1. The composite barium-free rust inhibitor, based on its total weight of 100%, is composed of 25% calcium petroleum sulfonate, 45% dinonylnaphthalene sulfonate, 5% imidazoline amide corrosion inhibitor, 20% zinc naphthenate, and 5% heptadecenyl imidazoline succinate.

[0047] Among them, the biodegradable base oil selected has a kinematic viscosity of 224.2 mmHg at 40°C. 2 Biodegradable synthetic ester base oils with a biodegradability rate greater than 60% (OECD 301-B) per s.

[0048] Table 1. Composition of Barium-Free Lubricating and Rust-Preventing Oil for Chains in Example 1

[0049]

[0050]

[0051] Add the above components and their amounts to the mixing vessel at once, and stir thoroughly at room temperature until the composition is uniformly mixed to obtain barium-free lubricating and rust-preventing oil for chains.

[0052] Example 2:

[0053] The components and contents of the barium-free lubricating and rust-preventing oil for chains provided in this embodiment are shown in Table 2. The composite barium-free rust inhibitor, based on its total weight of 100%, is composed of 25% calcium petroleum sulfonate, 50% dinonylnaphthalene sulfonate, 7% imidazoline amide corrosion inhibitor, 13% dodecenyl succinic acid, and 5% heptadecanyl imidazoline succinate.

[0054] Among them, the biodegradable base oil selected has a kinematic viscosity of 325.3 mmHg at 40°C. 2 Biodegradable synthetic ester base oils with a biodegradability rate greater than 60% (OECD 301-B) per s.

[0055] Table 2. Composition of Barium-Free Lubricating and Rust-Preventing Oil for Chains in Example 2

[0056]

[0057]

[0058] Add the above components and their amounts to the mixing vessel at once, and stir thoroughly at room temperature until the composition is uniformly mixed to obtain barium-free lubricating and rust-preventing oil for chains.

[0059] Example 3:

[0060] The components and contents of the barium-free lubricating and rust-preventing oil for chains provided in this embodiment are shown in Table 3. The composite barium-free rust inhibitor, based on its total weight of 100%, is composed of 25% calcium petroleum sulfonate, 50% dinonylnaphthalene sulfonate, 7% imidazoline amide corrosion inhibitor, 13% dodecenyl succinic acid, and 5% heptadecanyl imidazoline succinate.

[0061] Among them, the biodegradable base oil selected has a kinematic viscosity of 325.3 mmHg at 40°C. 2 Biodegradable synthetic ester base oils with a biodegradability rate greater than 60% (OECD 301-B) per s.

[0062] Table 3. Composition of Barium-Free Lubricating and Rust-Preventing Oil for Chains in Example 3

[0063] composition content Composite barium-free rust inhibitor 10.00％ Sulfated fatty acid esters 2.00％ tert-Butyltriphenyl phosphate 1.00％ 12-Hydroxystearic acid polylactone 3.00％ Lanolin fatty acid pentaerythritol ester 3.00％ Complex esters with molecular weights of 17,000 Da-22,000 Da 3.00％ Aluminum distearate 4.00％ Butyldiphenylamine 1.50％ benzotriazole Mannich condensate 0.10％ Fatty alcohol polyoxyethylene ether AEO-9 3.00％ Biodegradable synthetic ester base oils 69.40％

[0064] Add the above components and their amounts to the mixing vessel at once, and stir thoroughly at room temperature until the composition is uniformly mixed to obtain barium-free lubricating and rust-preventing oil for chains.

[0065] Example 4:

[0066] The components and contents of the barium-free lubricating and rust-preventing oil for chains provided in this embodiment are shown in Table 4. The composite barium-free rust inhibitor, based on its total weight of 100%, is composed of 20% calcium petroleum sulfonate, 40% dinonylnaphthalene sulfonate calcium, 10% imidazoline amide corrosion inhibitor, 10% sodium petroleum sulfonate, 10% dodecenyl succinic acid, 7% N-oleoyl sarcosine, and 3% heptadecanylaminoethyl imidazoline.

[0067] Among them, the biodegradable base oil selected has a kinematic viscosity of 495.5 mmHg at 40°C. 2 Biodegradable synthetic ester base oils with a biodegradability rate greater than 60% (OECD 301-B) per s.

[0068] Table 4. Composition of Barium-Free Lubricating and Rust-Preventing Oil for Chains in Example 4

[0069] composition content Composite barium-free rust inhibitor 15.00％ Di-tert-butyl polysulfide 1.00％ Isopropyltriphenyl phosphate 1.00％ Dimeric acid ester 2.00％ Lanolin magnesium soap 2.00％ Complex esters with molecular weights of 17,000 Da-22,000 Da 2.00％ Hydrogenated castor oil 2.50％ N-phenyl-α-naphthylamine 0.60％ Thiadiazole derivatives 0.08％ Diethylene glycol monobutyl ether 2.50％ Biodegradable synthetic ester base oils 71.32％

[0070] Add the above components and their amounts to the mixing vessel at once, and stir thoroughly at room temperature until the composition is uniformly mixed to obtain barium-free lubricating and rust-preventing oil for chains.

[0071] Comparative Example 1:

[0072] The difference between Comparative Example 1 and Example 4 is that barium petroleum sulfonate is used instead of calcium petroleum sulfonate in the composite barium-free rust inhibitor, barium dinonylnaphthalene sulfonate is used instead of calcium dinonylnaphthalene sulfonate in the composite barium-free rust inhibitor, and mineral base oil is used instead of the imidazolinamide corrosion inhibitor in the composite barium-free rust inhibitor, thus illustrating the effects of the composite barium-free rust inhibitor and the imidazolinamide corrosion inhibitor; chlorinated paraffin is used instead of the composite extreme pressure anti-wear agent of di-tert-butyl polysulfide and isopropyltriphenyl phosphate, and mineral base oil is used instead of the thixotropic agent, thus illustrating the effect of the thixotropic agent; the kinematic viscosity of the mineral base oil 150BS at 40°C is 493.7 mm. 2 / s replaced biodegradable synthetic ester base oils to illustrate the impact of biodegradable synthetic ester base oils on the environmental characteristics of the final rust-preventive oil product.

[0073] The components and their contents are shown in Table 5.

[0074] The composite rust inhibitor, by weight 100%, is composed of 20% barium petroleum sulfonate, 40% barium dinonylnaphthalene sulfonate, 10% mineral base oil 150BS, 10% sodium petroleum sulfonate, 10% dodecenyl succinic acid, 7% N-oleoyl sarcosine, and 3% heptadecanylaminoethyl imidazoline.

[0075] Table 5. Composition of the rust-preventive oil composition in Comparative Example 1

[0076] composition content Composite rust inhibitor* 15.00％ Chlorinated paraffin 2.00％ Dimeric acid ester 2.00％ Lanolin magnesium soap 2.00％ High molecular weight complex ester 2.00％ N-phenyl-α-naphthylamine 0.60％ Thiadiazole derivatives 0.08％ Diethylene glycol monobutyl ether 2.50％ Mineral base oil 150BS 73.82％

[0077] Add the above components and amounts to the mixing vessel at once, and stir thoroughly at room temperature until the composition is evenly mixed to obtain the rust-preventive oil.

[0078] The physicochemical analysis and rust prevention performance evaluation results of Examples 1-4 and Comparative Example 1 are shown in Table 6:

[0079] Table 6

[0080]

[0081]

[0082] As shown in Table 6, the physicochemical analysis results of Examples 1-4 and Comparative Example 1, including appearance, density, mechanical impurities, moisture, water-soluble acids and alkalis, separation stability, barium content, etc., as well as the evaluation test results of four-ball extreme pressure performance, four-ball wear test, salt spray test, damp heat test, corrosion test, and biodegradability test, are presented.

[0083] According to the experimental data of the maximum non-seize load example of the experimental project, it can be seen that the maximum non-seize load of the composition of this application is higher than that of the comparative example, which means that the lubrication performance of this application is better.

[0084] According to the experimental data of the barium content example, the barium content of this application is less than 10 ppm, which meets the environmental protection requirements of foreign environmental regulations that the anti-rust materials used in exported metal products must not contain barium, that is, it does not contain the heavy metal barium (barium content is less than 10 ppm).

[0085] According to Examples 1-4 in the table, the corrosion test was conducted at 55±1℃ for 168 hours according to SH / T 0081 standard. All 45# steel sheets were rated 0 and H62 copper sheets were rated 1, indicating that the rust-preventive oil of this application has very low corrosiveness.

[0086] According to the SH / T 0081-2000 standard, the 45# steel sheet and H62 copper sheet showed no rust after more than 168 hours of salt spray testing, indicating good salt spray resistance.

[0087] According to GB / T 2361-1992 standard, the 45# steel sheet and H62 copper sheet showed no rust after 160 days of damp heat test, indicating good resistance to damp heat.

[0088] In summary, the barium-free composite agent system containing imidazolinamide-type corrosion inhibitors and the extreme pressure anti-wear agent system combining sulfurized fatty acid esters or alkyl polysulfides with isopropylated triphenyl phosphate or tert-butylated triphenyl phosphate of the present invention, which are used for chain use, exhibit good storage stability, with barium content below 10 ppm, good four-ball extreme pressure performance and anti-wear properties, and a biodegradability rate of over 70%. In contrast, Comparative Example 1, which does not contain the composite barium-free rust inhibitor, extreme pressure anti-wear agent system, or thixotropic agent, shows inferior resistance to damp heat, salt spray, and four-ball extreme pressure anti-wear performance compared to Examples 1-4.

Claims

1. A barium-free lubricating and rust-preventing oil for chains, characterized in that, The composition by weight percentage is as follows: 10%-25% composite barium-free rust inhibitor, 1.5%-3.5% extreme pressure anti-wear agent, 1%-3% oiliness agent, 1%-3% film-forming agent, 1%-3% adhesion modifier, 2%-4% thixotropic agent, 0.5%-1.5% antioxidant, 0.03%-0.1% copper corrosion inhibitor, 1%-3% dehydrating agent, with the balance being biodegradable base oil; The composite barium-free rust inhibitor is composed of the following components by mass percentage: 20%-30% calcium petroleum sulfonate, 40%-50% dinonylnaphthalene sulfonate, 5%-10% imidazoline amide type corrosion inhibitor, and 10%-35% other rust inhibitors, with the sum of the above components by mass percentage being 100%. The other rust inhibitors are any one or a combination of several of the following: sodium petroleum sulfonate, dodecenyl succinic acid, dimer acid, dodecenyl succinic acid half ester, zinc naphthenate, N-oleoyl sarcosine, N-oleoyl sarcosine octadecylamine salt, heptadecanyl imidazoline enyl succinate, heptadecanyl hydroxyethyl imidazoline, heptadecanyl hydroxyethyl imidazoline, tallyl hydroxyethyl imidazoline, and heptadecanyl aminoethyl imidazoline. The general structural formula of the imidazoline amide type corrosion inhibitor is: （1） Where R is a straight or branched hydrocarbon group of C10 to C21, and n is an integer from 0 to 2, and n is not 0; The extreme pressure anti-wear agent is a sulfur-containing anti-wear agent and a neutral phosphate ester; The sulfur-containing anti-wear agent is a sulfurized fatty acid ester or an alkyl polysulfide; The neutral phosphate ester is isopropyltriphenyl phosphate or tert-butyltriphenyl phosphate.

2. The barium-free lubricating and rust-preventing oil for chains according to claim 1, characterized in that, The oiliness agent is any one or a combination of several of the following: polylactone castor oil, polylactone 12-hydroxystearate, dimer ester, and trimer ester.

3. The barium-free lubricating and rust-preventing oil for chains according to claim 1, characterized in that, The film-forming agent is any one or a combination of several of the following: petrolatum, oxidized wax ester, oxidized petroleum grease, oxidized petroleum grease calcium soap, lanolin, lanolin magnesium soap, lanolin calcium soap, and lanolin fatty acid pentaerythritol ester.

4. The barium-free lubricating and rust-preventing oil for chains according to claim 1, characterized in that, The adhesion modifier is a composite ester with a molecular weight of 17000 Da-22000 Da; the thixotropic agent is any one or a combination of hydrogenated castor oil, modified hydrogenated castor oil, and aluminum distearate.

5. The barium-free lubricating and rust-preventing oil for chains according to claim 1, characterized in that, The antioxidant is any one or a combination of several of the following: 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-p-(dimethylaminomethyl)phenol, N-phenyl-α-naphthylamine, N,N-di-sec-butyl-p-phenylenediamine, butyl-octyl-diphenylamine, dioctyl-diphenylamine, and dinonyl-diphenylamine.

6. The barium-free lubricating and rust-preventing oil for chains according to claim 1, characterized in that, The copper corrosion inhibitor is any one or a combination of several of benzotriazole, methylbenzotriazole, benzotriazole Mannich condensate, methylbenzotriazole Mannich condensate, and thiadiazole derivatives. The dehydrating agent is any one or a combination of several of diethylene glycol monobutyl ether, 3-methoxy-3-methyl-1-butanol, and fatty alcohol polyoxyethylene ether.

7. The barium-free lubricating and rust-preventing oil for chains according to claim 1, characterized in that, The biodegradable base oil has a kinematic viscosity of 200 mmHg at 40°C. 2 / s-500mm 2 Synthetic ester base oils with a biodegradability rate greater than 60% per second.

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