CN114958470B

CN114958470B - Composite lubricating oil repairing additive and preparation method thereof

Info

Publication number: CN114958470B
Application number: CN202210763434.1A
Authority: CN
Inventors: 梅学军; 刘均佳; 林华慧; 李红婴
Original assignee: Fujian Qingyoufu Industrial Co ltd
Current assignee: Fujian Qingyoufu Industrial Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-08-11
Anticipated expiration: 2042-06-30
Also published as: CN114958470A

Abstract

The application discloses a composite lubricating oil repairing additive, which comprises, by weight, 5-25 parts of a succinimide dispersant, 5-25 parts of an antioxidant, 5-25 parts of an extreme pressure antiwear agent, 10-35 parts of an antirust agent, 5-25 parts of a friction improver, 0.1-5 parts of an anti-foaming agent, 5-30 parts of a nonionic surfactant and 7-20 parts of base oil, wherein the succinimide dispersant, the nonionic surfactant and the base oil are in a weight ratio of (1-3): (2-5): (1-2); the preparation method of the repairing additive comprises the steps of firstly mixing the succinimide dispersing agent, the antioxidant and the base oil, and then adding other raw materials for mixing. The repairing additive is uniform liquid, does not have layering phenomenon, can be added into lubricating oil in a uniform state, and forms a uniform protective film on the surface of metal to protect the metal from corrosion and erosion, so that a good lubricating effect is achieved.

Description

Composite lubricating oil repairing additive and preparation method thereof

Technical Field

The application relates to the field of lubricating oil additives, in particular to a composite lubricating oil repair additive and a preparation method thereof.

Background

Lubricating oils are liquid lubricants used in automobiles and machinery to reduce friction and protect machinery and work pieces. In the use process of the lubricating oil, the oil is polluted and deteriorated after a period of use due to different working conditions and environments, the service performance is greatly reduced, the machine can not be normally used, and even serious safety accidents occur.

The reasons for the generation of the waste lubricating oil are mainly two types: firstly, the lubricating oil is mixed with impurities such as water, dust, metal powder and the like during daily use; secondly, as the service time increases, the lubricating oil gradually goes bad, and oxidative variants, organic acids, colloid sludge and the like are generated, so that the viscosity-temperature property and the oxidation-resistant stability of the lubricating oil are poor, the corrosiveness is enhanced, and the color is blackened. At present, the waste lubricating oil is treated by adopting regeneration processes such as distillation, acid washing, clay refining process, distillation, furfural refining, clay refining process, solvent extraction, distillation, hydrogenation process and the like at home and abroad, and then lubricating oil additives such as antioxidants, antiwear agents, friction improvers (friction improvers), extreme pressure additives, dispersants, foam inhibitors, corrosion and rust inhibitors and the like are added into the regenerated lubricating oil, so that various functions of the oil are recovered to meet the mechanical use standards. The composite additive is prepared by mixing various single additives together in advance, and can be added into lubricating oil to be repaired at one time, so that the repairing efficiency is effectively improved.

Disclosure of Invention

The inventor finds that when the content of the additive component in the existing composite additive is high, the mixed composite additive is difficult to form into a uniform state due to large physical and chemical property difference of various additives, and particularly when the content of the base oil is low, the problem is more obvious due to lack of the effect of the base oil as a fused various additives, and the failure of the composite additive is caused. In order to improve the fusion effect among all additives in the composite additive, an integrally uniform composite additive is formed, so that all functions of the regenerated lubricating oil after the composite additive is added are recovered to new oil standards.

In a first aspect, the application provides a composite lubricating oil repair additive, which comprises the following raw materials in parts by weight:

5-25 parts of succinimide dispersant;

5-25 parts of an antioxidant;

5-25 parts of extreme pressure antiwear agent;

10-35 parts of rust inhibitor;

5-25 parts of friction improver;

0.1-5 parts of an anti-foaming agent;

5-30 parts of nonionic surfactant;

7-20 parts of base oil;

the succinimide dispersant, the nonionic surfactant and the base oil are mixed according to the weight part ratio of (1-3): (2-5): (1-2).

The dispersing and fusing effects of the functional additives such as an antioxidant, an extreme pressure antiwear agent, an antirust agent, a friction improver, an anti-foaming agent and the like in the whole composite additive system are enhanced through the matching of the succinimide dispersing agent, the nonionic surfactant and the base oil, so that a uniform and stable composite additive system with good storage stability is obtained; meanwhile, the succinimide dispersant and the nonionic surfactant are matched for use, so that oxides generated in the use process of the lubricating oil and macromolecular substances formed by polymerization of the oxides can be effectively solubilized and dispersed, the generation of sediments is reduced, and the sediments are prevented from depositing and scaling on the mechanical surface.

Preferably, the succinimide dispersant is at least one selected from polyisobutylene succinimide, polyisobutylene bissuccinimide and boronated polyisobutylene succinimide.

Preferably, the succinimide dispersant is polyisobutylene succinimide with an average relative molecular weight of 1000-5000.

Preferably, the nonionic surfactant is selected from ethylene oxide-propylene oxide copolymer with 50-80wt% of propylene oxide.

Preferably, the antioxidant is at least one of zinc thiophosphoryl phenol, zinc thiophosphoryl secondary alkyl, zinc dialkyl dithiophosphate, 2, 6-di-tert-butyl mixed ester and zinc vulcanized carbamic acid.

Preferably, the rust inhibitor is at least one of barium sulfonate, sodium sulfonate, zinc epoxy, potassium ricinoleate, 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid.

Preferably, the rust inhibitor is prepared from 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid according to the mass ratio of (1-3): (1-3).

The friction improver is at least one of vulcanized olefin cotton seed oil, epoxy oleate, phosphate, molybdenum thiophosphate, butyl oleate, butyl stearate, oleic acid and triphenyl phosphite.

In a second aspect, the present application also provides a method for preparing a composite lubricant repair additive, comprising the steps of:

step 1, mixing the succinimide dispersant, the base oil and the antioxidant to obtain an oily mixture A;

step 2, adding the extreme pressure antiwear agent and the antirust agent into the oily mixture A in the step 1, and mixing to obtain an oily mixture B;

and 3, adding the friction improver, the anti-foaming agent and the nonionic surfactant into the oily mixture B in the step 2, and mixing to obtain the repairing additive.

The method is favorable for the fusion of antioxidants, extreme pressure antiwear agents, rust inhibitors, friction improvers and the like in the base oil through a step-by-step mixing mode.

Preferably, in the step 2, the temperature of the oily mixture B is adjusted to 40-50 ℃ before the friction modifier, the anti-foaming agent and the nonionic surfactant are added.

The composite additive for repairing lubricating oil is characterized by that a single additive is added into lubricating oil at one time, so that all indexes of repaired lubricating oil can meet the required index data. However, since the physicochemical properties of the various additives in the composite additive are greatly different, and in order to improve the addition efficiency of the composite additive (i.e., the content of the additive in the composite additive is high, the base oil is less, and the composite additive can be added less), the base oil content in the composite additive is also less, which results in that the various additives cannot form a uniform state after being mixed together, and the problems of poor addition effect, unsatisfactory part of indexes, satisfactory whole indexes, excessive part of indexes, poor batch stability of repair, and the like are caused. In order to solve the problems, the application obtains the composite additive with uniform state through the selection and process adjustment of the components of each additive under the condition of controlling less base oil in the composite additive, and adds the composite additive into lubricating oil to be repaired, wherein each index meets the requirements.

In summary, the present application includes at least one of the following beneficial technical effects:

the composite lubricating oil repairing additive is uniform and stable in state, good in stability in the storage process, not prone to bad phenomena such as layering and precipitation, good in repairing effect in waste lubricating oil, and capable of enabling all indexes of the repaired lubricating oil to meet requirements.

Detailed Description

The present application will be described in further detail with reference to examples.

The application provides a composite lubricating oil repairing additive which comprises the following raw materials in parts by weight: 5-25 parts of succinimide dispersant; 5-25 parts of an antioxidant; 5-25 parts of extreme pressure antiwear agent; 10-35 parts of rust inhibitor; 5-25 parts of friction improver; 0.1-5 parts of an anti-foaming agent; 5-30 parts of nonionic surfactant; 7-20 parts of base oil.

The preparation method of the composite lubricating oil repair additive comprises the following steps:

In the application, the single additive and the base oil in the composite additive are mixed step by step, so that the fusion effect is good, and the selected succinimide dispersant has interaction force with amino groups, ester groups, ether bonds and other groups in other additives, thereby being more beneficial to forming uniform and stable composite repair additives and preventing the composite repair additives from layering, precipitating and other phenomena in the storage process.

In the application, the succinimide dispersant is at least one selected from polyisobutylene succinimide, polyisobutylene bissuccinimide and boronated polyisobutylene succinimide.

The succinimide dispersant mainly plays roles of dispersing and solubilising. When the lubricating oil generates oil sludge-like impurities after being used for a period of time, the succinimide dispersing agent can act on the surface of the oil sludge to enable the oil sludge to be dispersed in the lubricating oil, and electrostatic repulsive force can be generated between the oil sludge, so that the mutual approaching and aggregation of the particles is prevented, the oil sludge is stably dispersed in the lubricating oil, and carbon deposition, paint film or pasty oil sludge formed by depositing the oil sludge particles on the surface of a machine is reduced; meanwhile, the succinimide dispersant can also form hydrogen bonds with the lubricating oil additive with polar groups, which is equivalent to the bridging effect of additives such as antioxidants and rust inhibitors with stronger polarity and base oil with weaker polarity, so that the additives with stronger polarity such as the antioxidants and the rust inhibitors can be promoted to be uniformly and stably present in the composite additive, and the possibility of layering phenomenon is reduced.

In the application, the nonionic surfactant can eliminate the obstacle of liquid drop combination in the lubricating oil, so that the liquid drops are combined together to achieve the effect of improving the emulsification resistance of the lubricating oil, and the ionic surfactant can also play a bridging role similar to that of succinimide dispersants.

Therefore, the combination of the succinimide dispersant and the nonionic surfactant promotes the fusion of the additives such as the antioxidant and the antirust agent with stronger polarity and the base oil with weaker polarity, thereby being beneficial to forming the composite repair additive in a uniform state.

In one embodiment, the weight part ratio of the succinimide dispersant, the nonionic surfactant and the base oil is (1-3): (2-5): (1-2); further, the weight ratio of the three components is 1: (4-5): (1.5-2).

In a preferred embodiment, the succinimide dispersant is polyisobutylene succinimide with an average relative molecular weight of 1000-5000; in particular, the average relative molecular weight may be 1000, 1500, 2000, 2500, 3000 or 4000; more preferably, the average relative molecular weight is 2000 to 4000.

The inventor finds that the average relative molecular weight of the succinimide dispersant is in the range of 1000-5000, and the succinimide dispersant has the best solubilization and dispersion effects; if the average relative molecular weight exceeds 5000, the content of the diimide is low, and the action with polar additives such as an antioxidant, a rust inhibitor and the like is weak; if the average relative molecular weight is less than 1000, the dispersion effect is poor, and it is also disadvantageous for forming a uniform and stable composite additive.

In the application, the nonionic surfactant is a low-foaming nonionic surfactant, has certain alkali resistance and plays a role in demulsification in lubricating oil; in the composite additive, the nonionic surfactant can also play a role in bridging, so that the fusion of the additives with stronger polarity, such as an antioxidant, an antirust agent and the like, and the base oil with relatively weaker polarity is promoted. In one embodiment, the nonionic surfactant is selected from ethylene oxide-propylene oxide copolymer with 50-80wt% of propylene oxide, and 50%, 55%, 60%, 65%, 68%, 70%, 75% or 80%; more preferably, the ethylene oxide-propylene oxide copolymer has a propylene oxide content of 60 to 68wt%.

In the application, ether bond in epoxypropane and epoxyethane chain segments has stronger interaction with carboxyl, amino and hydroxyl in antioxidants, extreme pressure antiwear agents, rust inhibitors and friction improvers, has good compatibility with the antioxidants, extreme pressure antiwear agents, rust inhibitors and friction improvers, and is not easy to generate layering phenomenon during use and storage; when the ratio of the epoxypropane chain segment is increased, the hydrophobicity is enhanced, and the regenerated lubricating oil has the effect of good oil-water separation performance; however, too high a ratio of propylene oxide segments can cause poor surface activity and cannot play a role in demulsification.

In one embodiment, the antioxidant may be at least one selected from zinc thiophosphoryl phenol, zinc thiophosphoryl secondary alkyl, zinc dialkyldithiophosphate, 2, 6-di-t-butyl mixed ester, 2, 6-di-t-butyl-p-cresol and zinc thiocarbamate.

In the application, the antioxidant has the peroxide generated in the oxidation process of decomposing oil products, can convert free radicals into inactive substances to prevent or cut off chain lock reaction, and plays a role in slowing down the oxidation of the oil products; and inorganic complex can be generated on the metal surface in the thermal decomposition process to form a protective film, so that the anti-corrosion effect is achieved, and part of the antioxidant can also chemically react with the metal surface under the extreme pressure condition to form a vulcanized film with certain bearing capacity, so that the extreme pressure anti-wear effect is achieved. Wherein 2, 6-di-tert-butyl-p-cresol is also a metal deactivator, which can generate a protective film on the surface of metal to prevent the corrosion of the metal parts by corrosive oxidation products.

In one embodiment, the rust inhibitor is at least one selected from barium sulfonate, sodium sulfonate, zinc oxide, potassium ricinoleate, 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid.

In the application, the antirust agent has stronger adsorption capacity, and can form a firm oil film on the metal surface after being added into lubricating oil, so as to protect the metal surface from being corroded and induced.

In a preferred embodiment, the rust inhibitor is prepared from 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid according to the mass ratio of (1-3): (1-3).

In the application, the 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid are mutually cooperated after being compounded and adsorbed on the metal surface to form a firm oil film on the metal surface, thereby not only protecting the metal surface from being corroded and corroded, but also improving the lubricity of the oil product and playing a role in reducing friction.

In one embodiment, the friction modifier is at least one of sulfurized olefin cottonseed oil, epoxy oleate, phosphate, molybdenum thiophosphate, butyl oleate, butyl stearate, oleic acid, and triphenyl phosphite.

In the application, the friction improver can be adsorbed on the metal surface to form a thinner oil film, thereby playing roles in improving the lubricity of oil products and reducing friction. Wherein, the sulfur content of the vulcanized olefin cotton seed oil is in the range of 15-20 percent, and the vulcanized olefin cotton seed oil has good compatibility with base oil and better lubricity.

In the present application, the anti-foaming agent functions to be adsorbed on the bubble film to form an unstable film, to be easily broken, or to be permeated into the bubble film to break the bubble. The anti-foaming agent may be selected from dimethicone.

In one embodiment, the mixing of step 1 is: stirring at 90-100deg.C for 30+ -5 min.

In one embodiment, the mixing of step 2 is: stirring at 100-110deg.C for 40+ -5 min.

In one embodiment, in the step 3, the temperature of the oily mixture B is adjusted to 40-50 ℃ before the friction modifier, the anti-foaming agent and the nonionic surfactant are added, and the subsequent raw materials are added and stirred for 30+/-5 minutes at constant temperature under the condition.

In the application, the raw materials are mixed at a proper temperature, so that the fusion of the single additives in the oil solution can be accelerated.

Example 1

A composite lubricating oil repairing additive comprises the following preparation methods:

adding 1.0kg of polyisobutylene succinimide (average relative molecular weight is 2000), 0.5kg of zinc dialkyl dithiophosphate and 2kg of base oil into a blending kettle, heating to 90+/-5 ℃, and stirring for 30+/-5 min under the condition of 650rpm to obtain an oily mixture A;

adding 0.8kg of di-n-butyl phosphite, 0.8kg of 2, 6-di-tert-butyl-p-cresol and 0.8kg of dodecenyl succinic acid into the oily mixture A, heating to 100+/-5 ℃, and stirring for 40+/-5 min under the condition of 550rpm to obtain an oily mixture B;

the oily mixture B was cooled to 45.+ -. 5 ℃ and then added with 0.8kg of vulcanized olefin cottonseed oil, 0.3kg of methyl silicone oil and 3kg of ethylene oxide-propylene oxide copolymer (propylene oxide ratio: 60%) and stirred at 450rpm for 30.+ -. 5min to obtain the additive.

Example 2

adding 1.0kg of polyisobutylene succinimide (average relative molecular weight is 2000), 1.2kg of zinc dialkyl dithiophosphate and 2kg of base oil into a blending kettle, heating to 90+/-5 ℃, and stirring for 30+/-5 min under the condition of 650rpm to obtain an oily mixture A;

1.2kg of di-n-butyl phosphite, 0.7kg of 2, 6-di-tert-butyl-p-cresol and 0.7kg of dodecenyl succinic acid are added into the oily mixture A, the temperature is raised to 105+/-5 ℃, and the mixture is stirred for 40+/-5 minutes under the condition of 550rpm to obtain an oily mixture B;

the oily mixture B was cooled to 45.+ -. 5 ℃ and then 1.19kg of a vulcanized olefin cottonseed oil, 0.01kg of a methyl silicone oil and 2kg of an ethylene oxide-propylene oxide copolymer (propylene oxide ratio: 60%) were added thereto, and stirred at 450rpm for 30.+ -. 5min to obtain an additive.

Example 3

adding 2.0kg of polyisobutylene succinimide (average relative molecular weight is 2000), 1.0kg of zinc dialkyl dithiophosphate and 2kg of base oil into a blending kettle, heating to 90+/-5 ℃, and stirring for 30+/-5 min under the condition of 650rpm to obtain an oily mixture A;

adding 0.5kg of di-n-butyl phosphite, 0.5kg of 2, 6-di-tert-butyl-p-cresol and 0.5kg of dodecenyl succinic acid into the oily mixture A, heating to 95+/-5 ℃, and stirring for 40+/-5 min under the condition of 550rpm to obtain an oily mixture B;

the oily mixture B was cooled to 40.+ -. 5 ℃ and then added with 0.5kg of vulcanized olefin cottonseed oil, 0.5kg of methyl silicone oil and 2.5kg of ethylene oxide-propylene oxide copolymer (propylene oxide ratio: 60%) and stirred at 450rpm for 30.+ -. 5min to obtain the additive.

Example 4

adding 0.7kg of polyisobutylene succinimide (average relative molecular weight is 2000), 1.2kg of zinc dialkyl dithiophosphate and 1kg of base oil into a blending kettle, heating to 90+/-5 ℃, and stirring for 30+/-5 min under the condition of 650rpm to obtain an oily mixture A;

1.5kg of di-n-butyl phosphite, 1.2kg of 2, 6-di-tert-butyl-p-cresol and 1.3kg of dodecenyl succinic acid are added into the oily mixture A, the temperature is raised to 100+/-5 ℃, and the mixture is stirred for 40+/-5 min under the condition of 550rpm to obtain an oily mixture B;

the oily mixture B was cooled to 45.+ -. 5 ℃ and then 1.4kg of vulcanized olefin cottonseed oil, 0.3kg of methyl silicone oil and 1.4kg of ethylene oxide-propylene oxide copolymer (propylene oxide ratio: 60%) were added thereto, and stirred at 450rpm for 30.+ -. 5min to obtain an additive.

Example 5

adding 0.5kg of polyisobutylene succinimide (average relative molecular weight is 2000), 0.5kg of zinc dialkyl dithiophosphate and 0.7kg of base oil into a blending kettle, heating to 90+/-5 ℃, and stirring for 30+/-5 min under the condition of 650rpm to obtain an oily mixture A;

1.0kg of di-n-butyl phosphite, 1.7kg of 2, 6-di-tert-butyl-p-cresol and 1.7kg of dodecenyl succinic acid are added into the oily mixture A, the temperature is raised to 100+/-5 ℃, and the mixture is stirred for 40+/-5 minutes under the condition of 550rpm to obtain an oily mixture B;

the oily mixture B was cooled to 45.+ -. 5 ℃ and then 1.6kg of vulcanized olefin cottonseed oil, 0.3kg of methyl silicone oil and 2.0kg of ethylene oxide-propylene oxide copolymer (propylene oxide ratio: 60%) were added thereto, and stirred at 450rpm for 30.+ -. 5min to obtain an additive.

Comparative example 1

1.0kg of polyisobutylene succinimide (average relative molecular weight: 2000), 0.5kg of zinc dialkyldithiophosphate, 2kg of base oil, 0.8kg of di-n-butyl phosphite, 0.8kg of 2, 6-di-t-butyl-p-cresol, 0.8kg of dodecenyl succinic acid, 0.8kg of vulcanized olefin cottonseed oil, 0.3kg of methyl silicone oil, 3kg of ethylene oxide-propylene oxide copolymer (propylene oxide ratio: 60%) were added to a mixing kettle, heated to 90.+ -. 5 ℃ and stirred for 2 hours at 650rpm to obtain an additive.

Comparative example 2

The difference from comparative example 1 is that the temperature during stirring was controlled at 105.+ -. 5 ℃.

Comparative example 3

The difference from example 1 is that the ethylene oxide-propylene oxide copolymer is replaced by an equivalent weight of polyisobutene succinimide (average relative molecular weight 2000).

Comparative example 4

The difference from example 1 is that the ethylene oxide-propylene oxide copolymer is replaced by an equal weight of sodium dodecylbenzenesulfonate.

Comparative example 5

adding 0.5kg of polyisobutylene succinimide (average relative molecular weight is 2000), 0.6kg of zinc dialkyl dithiophosphate and 0.4kg of base oil into a blending kettle, heating to 90+/-5 ℃, and stirring for 30+/-5 min under the condition of 650rpm to obtain an oily mixture A;

the oily mixture B was cooled to 45.+ -. 5 ℃ and then 1.8kg of a vulcanized olefin cottonseed oil, 0.3kg of a methyl silicone oil and 2.0kg of an ethylene oxide-propylene oxide copolymer (propylene oxide ratio: 60%) were added thereto, followed by stirring at 450rpm for 30.+ -. 5min to obtain an additive.

Performance test

1. The additives of examples 1 to 5 and comparative examples 1 to 5 were put into test tubes, their transparency was observed, and the test results were filled into the following table 1;

2. the additives of examples 1 to 5 and comparative examples 1 to 5 were put into test tubes and sealed with cork, and transparency thereof was observed after storage in a room for 3 months, 6 months and 12 months, and the test results were filled in the following table 1.

Table 1 transparency test

According to tables 1 and 2, the regenerated lubricating oil treated by the composite lubricating oil repairing additive prepared by adopting a stepwise mixing mode and matching with the selection and the proportion of each single component additive in the composite additive is uniform and stable, has good storage stability and is not easy to delaminate.

According to example 1, comparative example 1 and comparative example 2, it is seen that the single additives are added to the base oil and mixed in steps, the compatibility between each single additive and the base oil is good, each single additive can exist in the base oil uniformly and stably, and layering phenomenon is not easy to occur.

According to the embodiment 1, the comparative example 3 and the comparative example 4, the polyisobutylene succinimide is adopted as the dispersing agent, the ethylene oxide-propylene oxide copolymer is adopted as the anti-emulsifying agent to be added into the base oil, and the three components are cooperated, so that the compatibility of other single additives in the base oil can be improved, and the layering phenomenon is not easy to occur after long-term storage.

From examples 4, 5 and comparative example 5, it can be seen that as the proportion of base oil decreases, the lack of base oil in the base oil as a blend of individual additives will affect the miscibility between the other additives.

In order to further verify the addition effect of the compound lubricating oil repairing additive in the repaired waste lubricating oil, taking the gas holder sealing oil waste oil and uniformly dividing the gas holder sealing oil waste oil into 3 parts, wherein each part is 10L, respectively adding the embodiment 4 and the comparative example 5 into the waste oil to carry out repairing treatment, and specifically comprising the following steps:

step one, online cleaning: adding an oil-soluble online cleaning agent consisting of 70% of C14-C21 aromatic base oil, 15% of sodium alkyl naphthalene sulfonate and 15% of bissuccinimide, and dispersing a pipe wall oil scale coked material into the oil;

step two, carrying out vacuum flash evaporation at high temperature to separate and remove light components, and improving the flash point;

thirdly, temperature adjustment is carried out on the guided-out hot oil, so that the process requirements are met;

step four: adsorbing and flocculating high-boiling substances, asphaltenes, degummed oxides and the like through an adsorption and flocculation process;

step five: all solid particles were purified by filtration means.

Step six: taking 2 parts of filtered oil, respectively adding 80mL of the repairing additive of the example 4 and the repairing additive of the comparative example 5, and respectively numbering the treated 2 parts of regenerated gas holder sealing rings as 1a and 2a; the number of the regenerated gas cabinet sealing oil which is not treated by adding the composite additive is 3a for the rest 1 part.

The regenerated gas cabinet sealing oil is subjected to an anti-emulsifying performance test according to GB/T7305-2003 oil and synthetic liquid-water separation property determination method, the observed conditions of an oil layer, a water layer and an emulsifying layer are recorded, and the test result is filled in a table 2;

table 2 regenerated gasometer sealing oil test conditions

Numbering device	Anti-emulsifying test (54 ℃ C.)
		1a (example 4)	10min (40-40-0) mL; qualified and good oil-water separation effect
2a (comparative example 5)	30min (43-33-4) mL; failure, incomplete delamination
		3a (comparative example)	30min (0-0-80) mL; disqualification, no layering at all

As can be seen from the data in table 2, the regenerated lubricating oil treated with the compound lubricating oil repairing additive of the present application has good oil-water separation performance.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. The preparation method of the composite lubricating oil repair additive is characterized by comprising the following raw materials in parts by weight:

5-25 parts of succinimide dispersant;

5-25 parts of an antioxidant;

5-25 parts of extreme pressure antiwear agent;

10-35 parts of rust inhibitor;

5-25 parts of friction improver;

0.1-5 parts of an anti-foaming agent;

5-30 parts of nonionic surfactant;

7-20 parts of base oil;

the nonionic surfactant is an ethylene oxide-propylene oxide copolymer with the propylene oxide accounting for 50-80 wt%;

the succinimide dispersant, the nonionic surfactant and the base oil are mixed according to the weight part ratio of (1-3): (2-5): (1-2);

the preparation method comprises the following steps:

step 1, stirring the succinimide dispersant, the base oil and the antioxidant for 30+/-5 min at the temperature of 90-100 ℃ and mixing to obtain an oily mixture A;

step 2, adding the extreme pressure antiwear agent and the antirust agent into the oily mixture A in the step 1, and stirring for 40+/-5 min at the temperature of 100-110 ℃ for mixing to obtain an oily mixture B;

and 3, regulating the temperature of the oily mixture B in the step 2 to 40-50 ℃, adding the friction improver, the anti-foaming agent and the nonionic surfactant, stirring at constant temperature for 30+/-5 min, and mixing to obtain the repairing additive.

2. The method for preparing a compound lubricating oil repair additive according to claim 1, wherein the succinimide dispersant is at least one selected from the group consisting of polyisobutylene succinimide, polyisobutylene bis-succinimide and boronated polyisobutylene succinimide.

3. The method for preparing a compound lubricating oil repair additive according to claim 2, wherein the succinimide dispersant is polyisobutylene succinimide with an average relative molecular weight of 1000-5000.

4. The method for preparing a compound lubricating oil repair additive according to claim 1, wherein the antioxidant is at least one of zinc thiophosphoryl phenol, zinc thiophosphoryl secondary alkyl, zinc dialkyldithiophosphate, 2, 6-di-tert-butyl mixed ester and zinc vulcanized carbamic acid.

5. The method for preparing the compound lubricating oil repair additive according to claim 1, wherein the rust inhibitor is at least one selected from barium sulfonate, sodium sulfonate, zinc oxide, potassium ricinoleate, 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid.

6. The method for preparing a composite lubricating oil repair additive according to claim 5, wherein the rust inhibitor is prepared from 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid in a mass ratio of (1-3): (1-3).

7. The method for preparing a composite lubricating oil repair additive according to claim 1, wherein the friction improver is at least one selected from sulfurized olefin cottonseed oil, epoxy oleate, phosphate, molybdenum thiophosphate, butyl oleate, butyl stearate, oleic acid and triphenyl phosphite.