CN114958470A - Composite lubricating oil repair additive and preparation method thereof - Google Patents

Abstract

The application discloses a composite lubricating oil repair 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 modifier, 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 ratio of the succinimide dispersant to the nonionic surfactant to the base oil in parts by weight is (1-3): (2-5): (1-2); the preparation method of the repair additive comprises the steps of firstly mixing the succinimide dispersant, the antioxidant and the base oil, and then adding and mixing the other raw materials. The repair additive is uniform liquid, does not have a 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 being rusted and corroded, so that a good lubricating effect is achieved.

Description

Composite lubricating oil repair additive and preparation method thereof

Technical Field

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

Background

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

The reasons for the generation of used lubricating oil are mainly two types: firstly, the lubricating oil is mixed with impurities such as water, dust, metal powder and the like in daily use; secondly, as the service time increases, the lubricating oil gradually goes bad, and oxidation degradation substances, organic acid, colloidal oil sludge and the like are generated, so that the viscosity-temperature property and the oxidation resistance stability of the lubricating oil are poor, the corrosivity is enhanced, and the color becomes black. At present, regeneration processes such as distillation-acid washing-clay refining process, distillation-furfural refining-clay refining process, solvent extraction-distillation-hydrogenation process and the like are mostly adopted at home and abroad to treat waste lubricating oil, and then lubricating oil additives such as antioxidant, antiwear agent, friction modifier (friction modifier), extreme pressure additive, dispersant, foam inhibitor, anti-corrosion antirust agent and the like are added into the regenerated lubricating oil so as to restore various functions of the oil to meet the mechanical use standard. The composite additive is prepared by mixing various single additives in advance, and can be added into the lubricating oil to be repaired at one time, so that the repairing efficiency is effectively improved.

Disclosure of Invention

The inventors found that when the content of the additive components in the conventional composite additive is high, the composite additive after mixing is difficult to form a uniform state due to the large difference of the physical and chemical properties of the various additives, and particularly when the content of the base oil is low, the effect of the base oil as the blended additives is lacked, which is more obvious, and the failure of the composite additive is caused. In order to improve the fusion effect among additives in the composite additive, form an integrally uniform composite additive and restore each function of the regenerated lubricating oil to the new oil standard after the composite additive is added, the application provides a composite lubricating oil repair additive and a preparation method thereof.

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 an extreme pressure antiwear agent;

10-35 parts of an antirust agent;

5-25 parts of a friction modifier;

0.1-5 parts of anti-foaming agent;

5-30 parts of a nonionic surfactant;

7-20 parts of base oil;

the succinimide dispersant, the nonionic surfactant and the base oil are prepared from the following components in parts by weight (1-3): (2-5): (1-2).

Through the matching of the succinimide dispersant, the nonionic surfactant and the base oil, the dispersion and fusion effects of functional additives such as an antioxidant, an extreme pressure antiwear agent, an antirust agent, a friction modifier, an anti-foaming agent and the like in the whole composite additive system are enhanced, and a composite additive system with uniformity, stability and good storage stability is obtained; meanwhile, the succinimide dispersant and the nonionic surfactant are used in a matching way, so that oxides generated in the using process of the lubricating oil and macromolecular substances formed by the polymerization of the oxides can be effectively solubilized and dispersed, the generation of deposits is reduced, and the deposits are prevented from depositing and scaling on the surface of a machine.

Preferably, the succinimide dispersant is at least one of polyisobutylene succinimide, polyisobutylene bis-succinimide and boronized polyisobutylene succinimide.

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

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

Preferably, the antioxidant is at least one of zinc alkyl dithiophosphate, zinc primary and secondary alkyl dithiophosphate, zinc dialkyl dithiophosphate, 2, 6-di-tert-butyl mixed ester and zinc sulfide carbamate.

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

Preferably, the antirust agent is prepared from 2, 6-di-tert-butyl-p-cresol and dodecenylsuccinic acid in a mass ratio of (1-3): (1-3).

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 a second aspect, the present application also provides a method for preparing a composite lubricating oil repairing additive, comprising the following steps:

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 obtained in the step 1, and mixing to obtain an oily mixture B;

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

The blending of the antioxidant, the extreme pressure antiwear agent, the antirust agent, the friction modifier and the like in the base oil is facilitated through a step-by-step mixing mode.

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

The lubricating oil repairing composite additive is mainly characterized in that a single additive is added into lubricating oil at one time, so that each index of the repaired lubricating oil reaches the required index data. However, due to the large difference in the physicochemical properties of the additives in the composite additive, 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 amount of the base oil is small, and the amount of the composite additive can be reduced), the base oil content in the composite additive is also small, which causes the problems that the additives cannot form a uniform state after being mixed together, the addition effect is poor, part of the indexes cannot meet the requirements, all the indexes meet the requirements but part of the indexes exceed the requirements, or the stability of the repaired batch is poor. In order to solve the problems, the composite additive with a uniform state is obtained by selecting the components of the additive and adjusting the process under the condition of controlling the small amount of the base oil in the composite additive, and is added into the lubricating oil to be repaired, so that all indexes meet the requirements.

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

through formula design and process adjustment, the obtained composite lubricating oil repair additive is uniform and stable in state, good in stability in the storage process, not prone to causing adverse phenomena such as layering and precipitation, good in repair effect in waste lubricating oil, and capable of enabling various indexes of 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 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 an extreme pressure antiwear agent; 10-35 parts of an antirust agent; 5-25 parts of a friction modifier; 0.1-5 parts of anti-foaming agent; 5-30 parts of a nonionic surfactant; 7-20 parts of base oil.

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

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 obtained in the step 1, and mixing to obtain an oily mixture B;

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

In the invention, a stepwise mixing mode is utilized, the fusion effect of each single additive and the base oil in the composite additive is good, and the selected succinimide dispersant and amino groups, ester groups, ether bonds and other groups in other additives have interaction force, so that the uniform and stable composite repair additive is more favorably formed, and the phenomena of layering, precipitation and the like generated in the storage process of the composite repair additive are prevented.

In the invention, the succinimide dispersant is at least one of polyisobutylene succinimide, polyisobutylene bis-succinimide and boronized polyisobutylene succinimide.

The succinimide dispersant mainly plays roles in dispersing and solubilizing. When the lubricating oil generates oily sludge-like impurities after being used for a period of time, the succinimide dispersant can act on the surface of the oil sludge, so that the oil sludge can be dispersed in the lubricating oil, and electrostatic repulsive force can be generated between the oil sludge, so that the mutual approaching and aggregation among particles can be prevented, the oil sludge can be stably dispersed in the lubricating oil, and the phenomenon that oil sludge particles deposit on the surface of a machine to form carbon deposit, a paint film or pasty oil sludge is reduced; meanwhile, hydrogen bonds are formed between the succinimide dispersant and a lubricating oil additive with polar groups, which is equivalent to the bridging effect of additives such as an antioxidant and an antirust agent with strong polarity and base oil with relatively weak polarity, so that the additives with strong polarity such as the antioxidant and the antirust agent can be promoted to uniformly and stably exist in the composite additive, and the possibility of layering is reduced.

In the invention, 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 anti-emulsification effect of the lubricating oil, and the ionic surfactant can also play a bridging role similar to a succinimide dispersant.

Therefore, the succinimide dispersant and the nonionic surfactant jointly act to promote 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 to the nonionic surfactant to the base oil is (1-3): (2-5): (1-2); furthermore, the weight part ratio of the three components is 1: (4-5): (1.5-2).

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

The inventor finds that the average relative molecular weight of the succinimide dispersant is in the range of 1000-5000-; if the average relative molecular weight exceeds 5000, the content of diimide is low, and the effect of the diimide and polar additives such as an antioxidant, an antirust agent and the like is weak; if the average relative molecular weight is less than 1000, the dispersing effect is poor and it is also disadvantageous in forming a uniform and stable composite additive.

In the invention, 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 play a bridging role and promote the fusion of additives with stronger polarity, such as an antioxidant, an antirust agent and the like, and base oil with weaker polarity. In one embodiment, the nonionic surfactant is ethylene oxide-propylene oxide copolymer with propylene oxide content of 50-80wt%, 50%, 55%, 60%, 65%, 68%, 70%, 75% or 80%; more preferably, the ratio of propylene oxide in the ethylene oxide-propylene oxide copolymer is 60 to 68 wt%.

In the invention, strong interaction exists between ether bonds in epoxypropane and epoxyethane chain segments and carboxyl, amino and hydroxyl in an antioxidant, an extreme pressure antiwear agent, an antirust agent and a friction modifier, the compatibility between the epoxy chains and the carboxyl, amino and hydroxyl in the antioxidant, the extreme pressure antiwear agent, the antirust agent and the friction modifier is good, and the phenomenon of layering is not easy to generate during use and storage; when the proportion of the propylene oxide chain segment is increased, the hydrophobic property is enhanced, and the regenerated lubricating oil has a good oil-water separation effect; however, the propylene oxide segment has a too high ratio to make the surface active effect poor and to fail to exert a demulsifying effect.

In one embodiment, the antioxidant can be at least one of zinc alkyl thiophosphate, zinc primary and secondary thiophosphate, zinc dialkyl dithiophosphate, 2, 6-di-tert-butyl mixed ester, 2, 6-di-tert-butyl-p-cresol and zinc sulfide carbamate.

In the invention, the antioxidant can decompose peroxide generated in the oxidation process of the oil product, and can also convert free radicals into inactive substances to prevent or cut off chain reaction, thereby playing a role in slowing down the oxidation of the oil product; and inorganic complex can be generated in the thermal decomposition process to form a protective film on the metal surface to play a role in corrosion resistance, and part of the antioxidant can also react with the metal surface under the extreme pressure condition to form a vulcanized film with certain bearing capacity to play a role in extreme pressure wear resistance. 2, 6-di-tert-butyl-p-cresol is also a metal deactivator, and can form a protective film on the metal surface to prevent corrosion of the metal parts by corrosive oxidation products.

In one embodiment, the antirust agent is at least one of barium sulfonate, sodium sulfonate, zinc epoxide, potassium ricinoleate, 2, 6-di-tert-butyl-p-cresol and dodecenyl succinic acid.

In the invention, the antirust agent has stronger adsorption capacity, and can form a firm oil film on the metal surface by adding the antirust agent into lubricating oil, thereby protecting the metal surface from induced corrosion and corrosion.

In a preferred embodiment, the antirust agent is prepared from 2, 6-di-tert-butyl-p-cresol and dodecenylsuccinic acid in a mass ratio of (1-3): (1-3).

In the application, 2, 6-di-tert-butyl-p-cresol and dodecenylsuccinic acid are compounded and then mutually cooperated, and are adsorbed on the metal surface to form a firm oil film on the metal surface, so that the metal surface can be protected from being rusted and corroded, the lubricating property of an oil product can be improved, and the effect of reducing friction is achieved.

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 invention, the friction modifier can be adsorbed on the metal surface to form a thin oil film, thereby playing the roles of improving the lubricating property of oil products and reducing friction. Wherein, the sulfur content of the sulfurized olefin cottonseed oil is within the range of 15-20%, the sulfurized olefin cottonseed oil has good compatibility with base oil and has better lubricity.

In the present invention, the antifoaming agent functions to adsorb on the foam film, form an unstable film, easily break, or permeate into the foam film to break the foam. The anti-foaming agent may be selected from dimethicone.

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

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

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

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

Example 1

A compound lubricating oil repair additive is prepared by the following steps:

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 at 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 dodecenylsuccinic acid into the oily mixture A, heating to 100 +/-5 ℃, and stirring for 40 +/-5 min at 550rpm to obtain an oily mixture B;

and cooling the oily mixture B to 45 +/-5 ℃, adding 0.8kg of sulfurized olefin cottonseed oil, 0.3kg of methyl silicone oil and 3kg of ethylene oxide-propylene oxide copolymer (the propylene oxide accounts for 60%), and stirring at 450rpm for 30 +/-5 min to obtain the additive.

Example 2

A compound lubricating oil repair additive is prepared by the following steps:

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 at 650rpm to obtain an oily mixture A;

adding 1.2kg of di-n-butyl phosphite, 0.7kg of 2, 6-di-tert-butyl-p-cresol and 0.7kg of dodecenylsuccinic acid into the oily mixture A, heating to 105 +/-5 ℃, and stirring for 40 +/-5 min at 550rpm to obtain an oily mixture B;

and cooling the oily mixture B to 45 +/-5 ℃, adding 1.19kg of sulfurized olefin cottonseed oil, 0.01kg of methyl silicone oil and 2kg of ethylene oxide-propylene oxide copolymer (the propylene oxide accounts for 60%), and stirring at 450rpm for 30 +/-5 min to obtain the additive.

Example 3

A compound lubricating oil repair additive is prepared by the following steps:

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 at 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 dodecenylsuccinic acid into the oily mixture A, heating to 95 +/-5 ℃, and stirring for 40 +/-5 min at 550rpm to obtain an oily mixture B;

and cooling the oily mixture B to 40 +/-5 ℃, adding 0.5kg of sulfurized olefin cottonseed oil, 0.5kg of methyl silicone oil and 2.5kg of ethylene oxide-propylene oxide copolymer (the proportion of propylene oxide is 60%), and stirring at 450rpm for 30 +/-5 min to obtain the additive.

Example 4

A compound lubricating oil repair additive is prepared by the following steps:

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 at 650rpm to obtain an oily mixture A;

adding 1.5kg of di-n-butyl phosphite, 1.2kg of 2, 6-di-tert-butyl-p-cresol and 1.3kg of dodecenylsuccinic acid into the oily mixture A, heating to 100 +/-5 ℃, and stirring for 40 +/-5 min at 550rpm to obtain an oily mixture B;

and cooling the oily mixture B to 45 +/-5 ℃, adding 1.4kg of sulfurized olefin cottonseed oil, 0.3kg of methyl silicone oil and 1.4kg of ethylene oxide-propylene oxide copolymer (the proportion of propylene oxide is 60 percent), and stirring at 450rpm for 30 +/-5 min to obtain the additive.

Example 5

A compound lubricating oil repair additive is prepared by the following steps:

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 at 650rpm to obtain an oily mixture A;

adding 1.0kg of di-n-butyl phosphite, 1.7kg of 2, 6-di-tert-butyl-p-cresol and 1.7kg of dodecenylsuccinic acid into the oily mixture A, heating to 100 +/-5 ℃, and stirring for 40 +/-5 min at 550rpm to obtain an oily mixture B;

and cooling the oily mixture B to 45 +/-5 ℃, adding 1.6kg of sulfurized olefin cottonseed oil, 0.3kg of methyl silicone oil and 2.0kg of ethylene oxide-propylene oxide copolymer (the proportion of propylene oxide is 60 percent), and stirring at 450rpm for 30 +/-5 min to obtain the additive.

Comparative example 1

A compound lubricating oil repair additive is prepared by the following steps:

1.0kg of polyisobutylene succinimide (average relative molecular weight 2000), 0.5kg of zinc dialkyl dithiophosphate, 2kg of base oil, 0.8kg of di-n-butyl phosphite, 0.8kg of 2, 6-di-tert-butyl-p-cresol, 0.8kg of dodecenyl succinic acid, 0.8kg of sulfurized olefin cottonseed oil, 0.3kg of methyl silicone oil and 3kg of ethylene oxide-propylene oxide copolymer (propylene oxide accounts for 60%) are added into a blending kettle, heated to 90 +/-5 ℃, and stirred for 2 hours at 650rpm to obtain the 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 an equal weight of polyisobutylene succinimide (average relative molecular weight 2000) was used in place of the ethylene oxide-propylene oxide copolymer.

Comparative example 4

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

Comparative example 5

A compound lubricating oil repair additive is prepared by the following steps:

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 at 650rpm to obtain an oily mixture A;

adding 1.0kg of di-n-butyl phosphite, 1.7kg of 2, 6-di-tert-butyl-p-cresol and 1.7kg of dodecenylsuccinic acid into the oily mixture A, heating to 100 +/-5 ℃, and stirring for 40 +/-5 min at 550rpm to obtain an oily mixture B;

and cooling the oily mixture B to 45 +/-5 ℃, adding 1.8kg of sulfurized olefin cottonseed oil, 0.3kg of methyl silicone oil and 2.0kg of ethylene oxide-propylene oxide copolymer (the proportion of propylene oxide is 60 percent), and stirring at 450rpm for 30 +/-5 min to obtain the additive.

Performance test

1. The additives of examples 1 to 5 and comparative examples 1 to 5 were charged into a test tube, and the transparency thereof was observed, and the test results were filled in the following table 1;

2. the additives of examples 1 to 5 and comparative examples 1 to 5 were filled in a test tube and sealed with a cork, and the transparency was observed after indoor storage 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 the tables 1 and 2, the regenerated lubricating oil treated by the composite lubricating oil repairing additive prepared by adopting a step-by-step mixing mode and matching with the selection and the proportioning of each single-component additive in the composite additive is uniform and stable, has good storage stability and is not easy to layer.

According to the example 1, the comparative example 1 and the comparative example 2, the single additives are added into the base oil in steps and mixed, the single additives have good compatibility with the base oil, can uniformly and stably exist in the base oil, and are not easy to generate the layering phenomenon.

According to the embodiment 1, the comparative example 3 and the comparative example 4, the polyisobutylene succinimide is used as the dispersant, the ethylene oxide-propylene oxide copolymer is used as the anti-emulsifier and is added into the base oil, and the polyisobutylene succinimide, the ethylene oxide-propylene oxide copolymer and the anti-emulsifier are cooperated, so that the compatibility of other single additives in the base oil can be improved, and the delamination phenomenon is not easy to occur after the polyisobutylene is stored for a long time.

According to examples 4, 5 and 5, it can be seen that as the proportion of the base oil decreases, the lack of the base oil in the base oil of each single additive as a function of blending each single additive will affect the compatibility between the other additives.

In order to further verify the adding effect of the composite lubricating oil repairing additive in the repaired waste lubricating oil, the gas holder sealing oil waste oil is taken and equally divided into 3 parts, each part is 10L, the embodiment 4 and the comparative example 5 are respectively added into the waste oil for repairing treatment, and the concrete steps are as follows:

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 bis-succinimide, and dispersing oil dirt and coke on the pipe wall into oil;

step two, extracting light components to remove light components through high-temperature vacuum flash evaporation, and improving the flash point;

step three, regulating the temperature of the guided hot oil to meet the process requirements;

step four: adsorbing and flocculating high-boiling residues, asphaltenes, degumming oxides and the like by an adsorption flocculation process;

step five: all solid particles are purified and separated by a filtering device.

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

Carrying out anti-emulsification performance test on the regenerated gas holder sealing oil according to GB/T7305-2003 method for measuring water separability of petroleum and synthetic fluids, recording the observed conditions of an oil layer, a water layer and an emulsion layer, and filling the test results into a table 2;

TABLE 2 test conditions for sealing oil in regeneration gas holder

Numbering	Demulsification 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; fail and incomplete delamination
		3a (comparative example)	30min (0-0-80) mL; fail and no delamination at all

According to the data in table 2, it can be seen that the regenerated lubricating oil treated by the composite lubricating oil repairing additive has good oil-water separation performance.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. 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 an extreme pressure antiwear agent;

10-35 parts of an antirust agent;

5-25 parts of a friction modifier;

0.1-5 parts of anti-foaming agent;

5-30 parts of a nonionic surfactant;

7-20 parts of base oil;

the succinimide dispersant, the nonionic surfactant and the base oil are prepared from the following components in parts by weight (1-3): (2-5): (1-2).

2. The compound type lubricating oil repairing additive according to claim 1, wherein the succinimide dispersant is at least one selected from polyisobutylene succinimide, polyisobutylene bis-succinimide and boronized polyisobutylene succinimide.

3. The composite lubricating oil repairing additive as defined in claim 2, wherein the succinimide dispersant is polyisobutylene succinimide with an average relative molecular weight of 1000-5000.

4. The compound type lubricating oil restoration additive according to claim 1, wherein the nonionic surfactant is an ethylene oxide-propylene oxide copolymer with a propylene oxide content of 50-80 wt%.

5. The compound type lubricating oil repair additive according to claim 1, wherein the antioxidant is at least one selected from zinc dithiophosphate alkylphenate, zinc dithiophosphate primary and secondary alkyl zinc salts, zinc dialkyl dithiophosphate, 2, 6-di-tert-butyl mixed ester, and zinc sulfide carbamate.

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

7. The compound type lubricating oil repair additive according to claim 6, 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).

8. The compound additive for repairing lubricating oil according to claim 1, wherein the friction modifier is at least one selected from the group consisting of sulfurized olefin cottonseed oil, epoxy oleate, phosphate, molybdenum thiophosphate, butyl oleate, butyl stearate, oleic acid and triphenyl phosphite.

9. A method for preparing the composite type lubricating oil restoration additive according to any one of claims 1 to 8, which is characterized by comprising the following steps:

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 obtained in the step 1, and mixing to obtain an oily mixture B;

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

10. The preparation method according to claim 9, wherein in the step 2, the temperature of the oily mixture B is adjusted to 40-50 ℃ before the addition of the extreme pressure anti-wear agent and the rust preventive agent.