A Degradable High-Temperature Chain Oil and Its Preparation Method

Abstract

The present invention belongs to the technical field of high-temperature chain oils, and particularly relates to a degradable high-temperature chain oil and a preparation method thereof. A high-temperature chain oil comprises 80-90 parts of a composite base oil, 0.5-2 parts of a detergent-dispersant, 1-2.5 parts of a rust inhibitor, and 0.01-0.2 parts of an antifoaming agent; the composite base oil is composed of modified Rhodococcus oil and modified Jatropha curcas oil in a mass ratio of (2-2.5):1; cobalt salicylidene propylenediamine complex is also uniformly dispersed in the composite base oil. By modifying Rhodococcus oil and Jatropha curcas oil and using them as the base oil through a reasonable ratio, and then directly preparing and adding cobalt salicylidene propylenediamine complex in the composite base oil by the microemulsion method, and adding a detergent-dispersant and a rust inhibitor, a high-temperature chain oil with the characteristics of high temperature resistance, excellent lubrication performance and degradability is prepared.

Description

Technical Field

[0001] The present invention belongs to the technical field of chain oils, and particularly relates to a biodegradable high-temperature chain oil and a preparation method thereof. Background Art

[0002] Chain drive is a common drive structure. In order to ensure the smoothness of chain drive, chain oil needs to be used to ensure the flexible rotation between its chain links. Chain conveyors are applied in multiple fields: heat setting machines and printing and setting machines in the textile and printing and dyeing industries; stretching and tenter frames in the plastic film industry; continuous hot presses in the sheet processing industry; high-temperature paint baking oven chain transmission systems in the metal decoration, furniture, and automotive industries, etc. Since the working environments of most chain conveyors are at high temperatures, with the working temperature reaching above 200 °C, it is required that the chain oil should have excellent high-temperature resistance characteristics and lubrication performance.

[0003] In the industrial field, traditional high-temperature chain oils are usually difficult to biodegrade, and will cause long-term pollution to the environment such as soil and water sources after being discarded. Therefore, the research and development of biodegradable high-temperature chain oils and related technologies has become an inevitable trend. Chinese Patent CN106753688A discloses a biodegradable special chain oil for electric chain saws, which includes 0.5%-2.0% of a functional reinforcing agent, 1.0%-2.0% of tert-butylhydroquinone, 5%-20% of polymethacrylate, and the balance is a biodegradable base oil. The kinematic viscosity of the special lubricating oil for the electric chain saw chain involved in the present invention at 40 °C is 60-220 mm 2 / s. However, it has the defect of poor high-temperature resistance. Chinese Patent CN118813320A discloses a barium-free lubricating and rust-proof oil for chains, which is composed of 10%-25% of a composite barium-free rust inhibitor, 1.5%-3.5% of an extreme pressure and anti-wear agent, 1%-3% of an oiliness agent, 1%-3% of a film-forming agent, 1%-3% of an adhesion improver, 2%-4% of a thixotropic agent, 0.5%-1.5% of an antioxidant, 0.03%-0.1% of a copper corrosion inhibitor, 1%-3% of a dehydrating agent, and the balance is a biodegradable base oil raw material component. Although it is biodegradable, its oxidation stability at high temperatures is poor, and it is prone to coking at high temperatures. Summary of the Invention

[0004] In view of the above problems, the present invention provides a biodegradable high-temperature chain oil and a preparation method thereof, which well solve the problem that biodegradable chain oils are not heat-resistant.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In the first aspect, the present invention provides a biodegradable high-temperature chain oil.

[0007] A degradable high-temperature chain oil, comprising 80-90 parts of a composite base oil, 0.5-2 parts of a detergent-dispersant, 1-2.5 parts of a rust inhibitor, and 0.01-0.2 parts of an antifoaming agent; the composite base oil includes modified Rhodococcus ruber oil and modified Jatropha curcas oil, and cobalt bis(salicylidene propylenediamine) is uniformly dispersed in the composite base oil; the mass ratio of the modified Rhodococcus ruber oil to the modified Jatropha curcas oil is (2-2.5):1.

[0008] Through the above technical solution, the Rhodococcus ruber oil and Jatropha curcas oil are modified and reasonably proportioned, and then cobalt bis(salicylidene propylenediamine) is prepared directly in the two modified oils by the microemulsion method, and a high-temperature chain oil with high temperature resistance, excellent lubrication performance and degradability is prepared by adding a detergent-dispersant and a rust inhibitor.

[0009] Further, the preparation method of the modified Rhodococcus ruber oil is as follows: S1, fermenting and culturing Rhodococcus ruber; S2, converting and extracting the Rhodococcus ruber oil esterified product; S3, transesterifying the Rhodococcus ruber oil esterified product with ditrimethylolpropane to obtain the modified Rhodococcus ruber oil.

[0010] Further, the specific operation of S1 is as follows: After washing the Rhodococcus ruber seed solution with a nutrient solution, inoculate it at 3-5% into a medium containing 8-10 g / L rapeseed meal, and perform shake flask fermentation culture at 30-35 °C and 130-150 r / min for 40-48 h. Filter the fermented medium containing rapeseed meal in a sterile environment, transfer the obtained thalli to a medium without rapeseed meal, and perform shake flask fermentation culture at 30-35 °C and 130-150 r / min for 100-120 h, and then centrifuge to collect the thalli.

[0011] Further, the specific operation of S2 is as follows: Spread 2-2.5 g of thalli on a petri dish, irradiate with 400-450 W of microwave for 2-3 min, add 10-12 mL of 2.5 wt% potassium hydroxide methanol solution to the irradiated thalli, stir at 48-52 °C for 2-3 h, then perform vacuum filtration, collect the filtrate, neutralize it with an acidic methanol solution, and remove the solvent to obtain the Rhodococcus ruber oil esterified product.

[0012] Further, the specific operation of S3 is as follows: Mix the Rhodococcus ruber oil esterified product, ditrimethylolpropane and potassium carbonate, and perform vacuum stirring reaction at 130-150 °C under nitrogen protection for 3-5 hours, then perform filtration, and collect the filtrate, which is the modified Rhodococcus ruber oil; the mass ratio of the Rhodococcus ruber oil esterified product, ditrimethylolpropane and potassium carbonate is (50-60):(5.5-8.2):(0.65-0.75).

[0013] Through the above technical solution, first, rapid proliferation and expansion culture of Rhodococcus bacteria are carried out in a culture medium containing rapeseed meal, and then the amplified bacteria are transferred to a nitrogen-limited oil-producing culture medium to accumulate a large amount of oil in it. By fermenting and culturing Rhodococcus bacteria through a two-step method, the sugar utilization rate and oil content can be improved. Then, Rhodococcus bacteria are treated by microwave and combined with methyl esterification reaction extraction, integrating the efficient destruction of cell structure and the acquisition of Rhodococcus lipid esters, greatly improving the extraction efficiency of Rhodococcus oil, and directly obtaining esterification products, which is more economical and efficient. Finally, the Rhodococcus oil esters are esterified with ditrimethylolpropane, enhancing the thermal stability, antioxidant performance of the modified Rhodococcus oil and improving its viscosity and lubrication performance.

[0014] Further, the preparation method of the modified Jatropha curcas oil is as follows: When the Jatropha curcas oil is preheated in a shaker to 40 - 45 °C, neopentyl glycol is added, and after continuing to preheat to 62 - 67 °C, a composite lipase is added, and the reaction is oscillated for 2 - 3 h. Then, the composite lipase is removed by filtration and separation to obtain a liquid product, which is allowed to stand and layer, and the upper-layer liquid is taken, washed, and filtered to obtain the modified Jatropha curcas oil; the mass ratio of the Jatropha curcas oil, neopentyl glycol, and composite lipase is (40 - 45):(12 - 15):(2.5 - 3.2); the composite lipase is immobilized lipase RM and immobilized lipase 40086 in a mass ratio of 1:(2.2 - 2.5).

[0015] Through the above technical solution, using the composite lipase as a catalyst and neopentyl glycol as a modifier, the esterification modification of Jatropha curcas oil is directly completed, improving the oxidation stability of Jatropha curcas oil. This method has simple operation steps, convenient post-treatment, and avoids the saponification problem caused by alkali catalysis.

[0016] Further, the detergent-dispersant is fatty acid methyl ester sulfonate or modified cellulose.

[0017] Further, the rust inhibitor is a combination of alkyl sarcosine and imidazole derivatives in a mass ratio of (2 - 2.5):1.

[0018] In a second aspect, the present invention provides a preparation method of the above-mentioned biodegradable high-temperature chain oil, including the following steps: (1) refluxing and stirring modified Rhodococcus oil, modified Jatropha curcas oil, absolute ethanol, and a composite surfactant at 78 - 80 °C for 30 - 40 min, then adding salicylaldehyde and propylenediamine, stirring and reacting for 1 - 1.5 h, then adding cobalt acetylacetonate, and continuing to stir and react for 2 - 3 h, filtering by suction, collecting the filtrate, and removing absolute ethanol to obtain a composite base oil uniformly dispersed with cobalt salicylaldehyde propylenediamine complex; (2) heating the composite base oil to 100 - 120 °C, and adding a detergent-dispersant, a rust inhibitor, and an antifoaming agent under stirring to obtain the biodegradable high-temperature chain oil.

[0019] Further, the dosage ratio of the total amount of the modified Rhodococcus oil and the modified Jatropha curcas oil, absolute ethanol, composite surfactant, salicylaldehyde, propylenediamine, and cobalt acetylacetonate is (13.2 - 14.5) g : (15 - 20) mL : (1.8 - 2.2) g : (0.36 - 0.55) mL : (0.12 - 0.18) mL : (0.82 - 1.23) g; the composite surfactant is composed of Tween 80, glycerol monostearate, and isopropanol in a mass ratio of (1 - 1.2) : (4 - 4.3) : (5 - 6).

[0020] Through the above technical solution, cobalt salicylaldehyde propylenediamine complex is directly prepared and added to the composite base oil by the microemulsion method, enabling cobalt salicylaldehyde propylenediamine complex to be uniformly and stably dispersed in the composite base oil. Through the selective transfer effect, a firm and smooth protective film is formed on the metal surface, thereby fully exerting its anti-wear and friction-reducing effects and simultaneously improving the high-temperature oxidation resistance of the base composite oil.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention modifies Rhodococcus oil and Jatropha curcas oil and uses them as the base oil through a reasonable ratio. Then, cobalt salicylaldehyde propylenediamine complex is directly prepared and added to the composite base oil by the microemulsion method, and a high-temperature chain oil with high temperature resistance, excellent lubrication performance, and biodegradability is prepared by adding a detergent-dispersant and a rust inhibitor.

[0023] The present invention directly prepares and adds cobalt salicylaldehyde propylenediamine complex to the composite base oil by the microemulsion method, enabling cobalt salicylaldehyde propylenediamine complex to be uniformly and stably dispersed in the composite base oil. Through the selective transfer effect, a firm and smooth protective film is formed on the metal surface, thereby fully exerting its anti-wear and friction-reducing effects and simultaneously improving the high-temperature oxidation resistance of the base composite oil. Description of the Drawings

[0024] Figure 1 SEM image of the composite base oil uniformly dispersed with cobalt salicylaldehyde propylenediamine complex. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] The composition of the nutrient solution is as follows: 80 g / L of xylose residue, 10 g / L of urea, 1 g / L of MgSO4·7H2O, 0.02 g / L of CaCl2·2H2O, 0.5 g / L of FeSO4·7H2O, 0.4 g / L of ZnSO4·7H2O, 0.02 g / L of MnSO4·5H2O, 0.015 g / L of H3BO3, 0.01 g / L of NiCl2·2H2O, 0.25 g / L of EDTA, 0.05 g / L of CoCl2·6H2O, 0.005 g / L of CuCl2·2H2O, 1 ml / L of Stock A solution, 35.2 ml / L of 1.0 M phosphate buffer solution, and the balance is water; among them, the formula of Stock A solution is 2 g / L of NaMoO4·2H2O and 5 g / L of FeNa·EDTA; the formula of 1.0 M phosphate buffer solution is 47 g / L of KH2PO4 and 113 g / L of K2HPO4.

[0027] The culture medium containing rapeseed meal (except that it does not contain xylose residue and urea, but contains rapeseed meal, and the other components are the same as those of the nutrient solution).

[0028] The culture medium without rapeseed meal: has the same composition as the nutrient solution.

[0029] Example 1

[0030] A biodegradable high-temperature chain oil, comprising 80 parts of a composite base oil, 0.5 part of a detergent-dispersant, 1 part of an anti-rust agent, and 0.01 part of an anti-foaming agent; the composite base oil includes modified Rhodococcus oil and modified Jatropha curcas oil, and cobalt salicylaldehyde propylenediamine complex is also evenly dispersed in the composite base oil; the mass ratio of the modified Rhodococcus oil to the modified Jatropha curcas oil is 2:1; the detergent-dispersant is fatty acid methyl ester sulfonate; the anti-rust agent is a combination of alkyl sarcosine and imidazole derivative in a mass ratio of 2:1; the anti-foaming agent is a hydroxyl-terminated polydimethylsiloxane anti-foaming agent.

[0031] The preparation method of the modified Rhodococcus oil is as follows: S1, ferment and culture Rhodococcus (variety: R. opacus PD630): After washing the Rhodococcus seed solution with the nutrient solution, inoculate it at 3% into the culture medium containing 8 g / L of rapeseed meal, and perform shake flask fermentation culture at 30 °C and 150 r / min for 48 h. Filter the culture medium of the rapeseed meal-containing culture medium after fermentation is completed in a sterile environment, transfer the obtained thalli to the culture medium without rapeseed meal, and perform shake flask fermentation culture at 30 °C and 150 r / min for 120 h, and then centrifuge to collect the thalli;

[0032] S2. Conversion and extraction of Rhodococcus oil esters: Spread 2 g of the bacterial cells on a petri dish, irradiate with 400 W of microwave for 2 min, add 10 mL of 2.5 wt% potassium hydroxide methanol solution to the irradiated bacterial cells, stir at 48 °C for 2 h, then perform vacuum filtration. After collecting the filtrate, neutralize it with an acidic methanol solution and remove the solvent to obtain Rhodococcus oil esters;

[0033] S3. Preparation of modified Rhodococcus oil: Mix 50 g of Rhodococcus oil esters, 5.5 g of ditrimethylolpropane, and 0.65 g of potassium carbonate, evacuate and stir the reaction under nitrogen protection at 130 °C for 3 h, perform filtration, and collect the filtrate, which is the modified Rhodococcus oil.

[0034] The preparation method of the modified Jatropha curcas oil is as follows: When 40 g of Jatropha curcas oil is preheated to 40 °C on a shaker, add 12 g of neopentyl glycol, continue to preheat to 62 °C, then add 2.5 g of immobilized lipase RM and immobilized lipase 40086 in a mass ratio of 1:2.2. Oscillate and react for 2 h, then filter and separate to remove the immobilized lipase to obtain a liquid product. Let it stand for layering, take the upper layer liquid, wash it, and filter it to obtain the modified Jatropha curcas oil; The immobilized lipase RM and immobilized lipase 40086 are both purchased from Beijing Gaoruisen Technology Co., Ltd.

[0035] The biodegradable high-temperature chain oil is prepared by the following steps: (1) Mix the modified Rhodococcus oil and modified Jatropha curcas oil (total mass 13.2 g), 15 mL of anhydrous ethanol, and 1.8 g of a composite surfactant, reflux and stir at 78 °C for 30 min, then add 0.36 mL of salicylaldehyde and 0.12 mL of propylenediamine, stir and react for 1 h, then add 0.82 g of cobalt acetylacetonate, continue to stir and react for 2 h, perform filtration, collect the filtrate, and remove the anhydrous ethanol to obtain a composite base oil with cobalt salicylaldehyde propylenediamine complex uniformly dispersed therein; The composite surfactant is composed of Tween 80, glycerol monostearate, and isopropanol in a mass ratio of 1:4:5; (2) Heat the composite base oil to 100 °C, and add a detergent-dispersant, a rust inhibitor, and an antifoaming agent under stirring to obtain the biodegradable high-temperature chain oil.

[0036] Example 2

[0037] A biodegradable high-temperature chain oil comprises 85 parts of a composite base oil, 1.2 parts of a detergent-dispersant, 1.8 parts of a rust inhibitor, and 0.1 part of an antifoaming agent; The composite base oil includes modified Rhodococcus oil and modified Jatropha curcas oil, and cobalt salicylaldehyde propylenediamine complex is also uniformly dispersed in the composite base oil; The mass ratio of the modified Rhodococcus oil to the modified Jatropha curcas oil is 2.3:1; The detergent-dispersant is modified cellulose; The rust inhibitor is a combination of alkyl sarcosine and imidazole derivative in a mass ratio of 2.2:1; The antifoaming agent is a dimethyl silicone oil antifoaming agent.

[0038] The preparation method of the modified Rhodococcus oil is as follows: S1, fermenting and culturing Rhodococcus (variety: R. opacus PD630): After washing the Rhodococcus seed liquid with nutrient solution, inoculating it at 4% into the culture medium containing 9 g / L rapeseed meal, culturing it on a shaker at 32 °C and 140 r / min for 44 h, filtering the culture medium bacterial liquid containing rapeseed meal after fermentation under sterile environment, transferring the obtained bacterial cells to the culture medium without rapeseed meal, culturing it on a shaker at 32 °C and 140 r / min for 110 h, centrifuging, and collecting the bacterial cells;

[0039] S2, converting and extracting the Rhodococcus oil ester: Spreading 2.2 g of bacterial cells on a petri dish, irradiating with 450 W microwave for 2 min, adding 11 mL of 2.5 wt% potassium hydroxide methanol solution to the irradiated bacterial cells, stirring at 50 °C for 2.5 h, then vacuum filtering, collecting the filtrate, neutralizing with acid-containing methanol solution, and removing the solvent to obtain the Rhodococcus oil ester;

[0040] S3, preparing the modified Rhodococcus oil: Mixing 55 g of Rhodococcus oil ester, 6.1 g of dipentaerythritol, and 0.70 g of potassium carbonate, stirring and reacting under vacuum at 140 °C under nitrogen protection for 4 h, filtering, and collecting the filtrate, which is the modified Rhodococcus oil.

[0041] The preparation method of the modified Jatropha curcas oil is as follows: When preheating 43 g of Jatropha curcas oil to 42 °C on a shaker, adding 14 g of neopentyl glycol, continuing to preheat to 65 °C, then adding 2.8 g of composite lipase, oscillating and reacting for 2.5 h, then filtering to separate and remove the composite lipase to obtain a liquid product, standing and separating into layers, taking the upper layer liquid, washing, and filtering to obtain the modified Jatropha curcas oil; the composite lipase is composed of immobilized lipase RM and immobilized lipase 40086 according to a mass ratio of 1:2.4. Both the immobilized lipase RM and the immobilized lipase 40086 are purchased from Beijing Gaoruisen Technology Co., Ltd.

[0042] The biodegradable high-temperature chain oil is prepared through the following steps: (1) Mixing the modified Rhodococcus oil and the modified Jatropha curcas oil (total mass 13.8 g), 18 mL of absolute ethanol, and 2 g of composite surfactant, refluxing and stirring at 79 °C for 35 min, then adding 0.44 mL of salicylaldehyde and 0.15 mL of propylenediamine, stirring and reacting for 1.2 h, then adding 1 g of cobalt acetylacetonate, continuing to stir and react for 2.5 h, filtering, collecting the filtrate, and removing the absolute ethanol to obtain a composite base oil with cobalt salicylaldehyde propylenediamine complex uniformly dispersed; the composite surfactant is composed of Tween 80, glycerol monostearate, and isopropanol according to a mass ratio of 1.1:4.2:5.5; (2) Heating the composite base oil to 110 °C, adding a detergent-dispersant, a rust inhibitor, and an antifoaming agent under stirring to obtain the biodegradable high-temperature chain oil.

[0043] Example 3

[0044] A degradable high-temperature chain oil, comprising 90 parts of a composite base oil, 2 parts of a detergent-dispersant, 2.5 parts of a rust inhibitor, and 0.2 part of an antifoaming agent; the composite base oil includes modified Rhodococcus oil and modified Jatropha curcas oil, and cobalt salicylidene propylenediamine is evenly dispersed in the composite base oil; the mass ratio of the modified Rhodococcus oil to the modified Jatropha curcas oil is 2.5:1; the detergent-dispersant is fatty acid methyl ester sulfonate or modified cellulose; the rust inhibitor is a combination of alkyl sarcosine and imidazole derivative in a mass ratio of 2.5:1; the antifoaming agent is a polyether-modified silicone antifoaming agent.

[0045] The preparation method of the modified Rhodococcus oil is as follows: S1, fermenting and culturing Rhodococcus (variety: R.opacus PD630): after washing the Rhodococcus seed liquid with a nutrient solution, inoculating it at 5% into a medium containing 10 g / L rapeseed meal, performing shake flask fermentation culture at 35 °C and 130 r / min for 40 h, filtering the culture medium containing rapeseed meal of the completed fermentation in a sterile environment, transferring the obtained thallus to a medium without rapeseed meal, performing shake flask fermentation culture at 35 °C and 130 r / min for 100 h, and centrifuging to collect the thallus;

[0046] S2, converting and extracting Rhodococcus oil esterified product: spreading 2.5 g of thallus on a petri dish, performing microwave radiation at 450 W for 3 min, adding 12 mL of 2.5 wt% potassium hydroxide methanol solution to the irradiated thallus, stirring at 52 °C for 3 h, then performing vacuum filtration, collecting the filtrate, neutralizing it with an acidic methanol solution, and removing the solvent to obtain the Rhodococcus oil esterified product;

[0047] S3, preparing modified Rhodococcus oil: mixing 60 g of Rhodococcus oil esterified product, 8.2 g of ditrimethylolpropane, and 0.75 g of potassium carbonate, performing vacuum stirring reaction at 150 °C under nitrogen protection for 5 h, filtering, and collecting the filtrate, which is the modified Rhodococcus oil.

[0048] The preparation method of the modified Jatropha curcas oil is as follows: when preheating 45 g of Jatropha curcas oil to 45 °C on a shaker, adding 15 g of neopentyl glycol, continuing to preheat to 67 °C, adding 3.2 g of a composite lipase, performing oscillating reaction for 3 h, then filtering and separating to remove the composite lipase to obtain a liquid product, standing and separating layers, taking the upper layer liquid, washing, and filtering to obtain the modified Jatropha curcas oil; the composite lipase is immobilized lipase RM and immobilized lipase 40086 in a mass ratio of 1:2.5. Both the immobilized lipase RM and the immobilized lipase 40086 are purchased from Beijing Gaoruisen Technology Co., Ltd.

[0049] The biodegradable high-temperature chain oil is prepared through the following steps: (1) Mix modified Rhodococcus oil, modified Jatropha curcas oil (total mass 14.5 g), 20 mL of absolute ethanol, and 2.2 g of a composite surfactant, reflux and stir at 80°C for 40 min. Then add 0.55 mL of salicylaldehyde and 0.18 mL of propylenediamine, stir and react for 1.5 h. Next, add 1.23 g of cobalt acetylacetonate, continue to stir and react for 3 h, perform suction filtration, collect the filtrate, and remove the absolute ethanol to obtain a composite base oil with cobalt salicylaldehyde propylenediamine uniformly dispersed therein. The composite surfactant consists of Tween 80, glycerol monostearate, and isopropanol in a mass ratio of 1.2:4.3:6. (2) Heat the composite base oil to 100 - 120°C, and add a detergent-dispersant, a rust inhibitor, and an antifoaming agent under stirring to obtain the biodegradable high-temperature chain oil.

[0050] Comparative Example 1

[0051] Same as Example 3, except that the preparation steps of a biodegradable high-temperature chain oil are as follows: Mix modified Rhodococcus oil, modified Jatropha curcas oil, absolute ethanol, and a composite surfactant, reflux and stir at 80°C for 40 min. Then add cobalt salicylaldehyde propylenediamine and continue to stir for 3 h to obtain a composite base oil containing cobalt salicylaldehyde propylenediamine. Then heat the composite base oil containing cobalt salicylaldehyde propylenediamine to 120°C, and add a detergent-dispersant and a rust inhibitor under stirring to obtain the biodegradable high-temperature chain oil.

[0052] Comparative Example 2

[0053] Same as Example 3, except that the composite base oil does not contain cobalt salicylaldehyde propylenediamine and is directly used for the preparation of the biodegradable high-temperature chain oil.

[0054] Comparative Example 3

[0055] Same as Example 3, except that in the composite base oil, the modified Jatropha curcas oil is replaced with an equal amount of Jatropha curcas oil.

[0056] Comparative Example 4

[0057] Same as Example 3, except that in the composite base oil, the modified Rhodococcus oil is replaced with an equal amount of Rhodococcus oil ester.

[0058] Comparative Example 5

[0059] Same as Example 3, except that in the composite base oil, the modified Rhodococcus oil and the modified Jatropha curcas oil are combined in a mass ratio of 1:2.5.

[0060] Performance test:

[0061] a. After 20 minutes of completion of the preparation of the composite base oil uniformly dispersed with cobalt salicylidene propanediamine in Example 3, a sample was sucked with a dropper, diluted with ethanol, and the diluted solution was taken for particle size observation using a scanning electron microscope. The results are as Figure 1 shown. It can be seen from Figure 1 that the particle size of cobalt salicylidene propanediamine is about 2 microns, the particle size is uniform, the dispersibility is good, and there is no obvious agglomeration phenomenon, indicating that the preparation method of the present application can uniformly disperse cobalt salicylidene propanediamine in the composite base oil.

[0062] b. Data verification and analysis were carried out on cobalt salicylidene propanediamine in the composite base oil prepared in Example 3. The results are as follows: IRv(cm -1 ): 1605, 1406, 742; Msm / z(relative intensity / %): 337.2; Elemental analysis: The molecular formula is C 17 H 16 N2O2Co, the theoretical value of the element content is C 60.15%, H 4.72%, N 8.26%, and the measured values are C 59.45%, H 4.45%, N 8.40%, which are basically consistent with the theoretical values, proving that cobalt salicylidene propanediamine was successfully prepared.

[0063] c. The composite base oils containing cobalt salicylidene propanediamine prepared in Example 3 and Comparative Example 1 were each injected into a centrifuge tube and centrifuged at a speed of 4000 rpm for 10 minutes to observe the phenomenon.

[0064] The results showed that the composite base oil containing cobalt salicylidene propanediamine prepared in Example 3 still had good uniformity; while the composite base oil containing cobalt salicylidene propanediamine prepared in Comparative Example 1 showed a phenomenon of two-phase separation with good uniformity.

[0065] d. The physical and chemical properties and degradation properties of the high-temperature chain oils prepared in Examples 1-3 and Comparative Examples 1-5 were tested. The results are shown in Table 1:

[0066] Table 1. Performance test results

[0067]

[0068] It can be seen from Table 1 that the high-temperature chain oils prepared in Examples 1-3 of the present application have excellent high-temperature performance, lubricating performance, anti-wear extreme pressure performance and anti-coking performance.

[0069] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A degradable high-temperature chain oil, characterized in that: It includes 80 - 90 parts of compound base oil, 0.5 - 2 parts of detergent-dispersant, 1 - 2.5 parts of rust inhibitor, and 0.01 - 0.2 parts of defoamer; the compound base oil includes modified Rhodococcus oil and modified Jatropha curcas oil, and cobalt (II) salicylaldehyde propanediamine is also evenly dispersed in the compound base oil; the mass ratio of the modified Rhodococcus oil to the modified Jatropha curcas oil is (2 - 2.5):1; The preparation method of the modified Rhodococcus oil is as follows: S1, ferment and culture Rhodococcus; S2, transform and extract the Rhodococcus oil ester; S3, transesterify the Rhodococcus oil ester with dipentaerythritol to obtain the modified Rhodococcus oil; The preparation method of the modified Jatropha curcas oil is as follows: When the Jatropha curcas oil is preheated in a shaker to 40 - 45 °C, add neopentyl glycol, continue to preheat to 62 - 67 °C, then add immobilized lipase, oscillate and react for 2 - 3 h, then filter and separate to remove the immobilized lipase to obtain a liquid product, let it stand for layering, take the upper-layer liquid, wash it, and filter it to obtain the modified Jatropha curcas oil.

2. The biodegradable high-temperature chain oil according to claim 1, wherein: The specific operation of S1 is as follows: Wash the Rhodococcus seed liquid with nutrient solution, then inoculate it into a medium containing 8 - 10 g / L rapeseed meal at 3 - 5%, and ferment and culture it on a shaker at 30 - 35 °C and 130 - 150 r / min for 40 - 48 h. Filter the culture medium containing rapeseed meal of the fermented product in a sterile environment, transfer the obtained thallus to a medium without rapeseed meal, and ferment and culture it on a shaker at 30 - 35 °C and 130 - 150 r / min for 100 - 120 h, then centrifuge and collect the thallus.

3. A degradable high-temperature chain oil according to claim 1, characterized in that: The specific operation of S2 is as follows: Spread 2 - 2.5 g of thallus on a petri dish, irradiate it with 400 - 450 W microwave for 2 - 3 min, add 10 - 12 mL of 2.5 wt% potassium hydroxide methanol solution to the irradiated thallus, stir it at 48 - 52 °C for 2 - 3 h, then filter it under vacuum. After collecting the filtrate, neutralize it with an acidic methanol solution and remove the solvent to obtain the Rhodococcus oil ester.

4. The biodegradable high-temperature chain oil according to claim 2, characterized in that: The specific operation of S3 is as follows: Mix the Rhodococcus oil ester, dipentaerythritol, and potassium carbonate, and under nitrogen protection, stir and react under vacuum at 130 - 150 °C for 3 - 5 h, then filter and collect the filtrate, which is the modified Rhodococcus oil; the mass ratio of the Rhodococcus oil ester, dipentaerythritol, and potassium carbonate is (50 - 60):(5.5 - 8.2):(0.65 - 0.75).

5. The biodegradable high-temperature chain oil according to claim 1, characterized in that: The mass ratio of the Jatropha curcas oil, neopentyl glycol, and immobilized lipase is (40 - 45):(12 - 15):(2.5 - 3.2); the immobilized lipase is composed of immobilized lipase RM and immobilized lipase 40086 in a mass ratio of 1:(2.2 - 2.5).

6. The biodegradable high-temperature chain oil according to claim 1, wherein: The detergent-dispersant is fatty acid methyl ester sulfonate or modified cellulose.

7. A degradable high-temperature chain oil according to claim 1, characterized in that: The rust inhibitor is composed of alkyl sarcosine and imidazole derivative in a mass ratio of (2 - 2.5):

1.

8. The preparation method of a degradable high-temperature chain oil according to any one of claims 1-7, characterized in that: It includes the following steps: (1) Reflux and stir the modified Rhodococcus oil, modified Jatropha curcas oil, absolute ethanol, and composite surfactant at 78 - 80 °C for 30 - 40 min, then add salicylaldehyde and propylenediamine, stir and react for 1 - 1.5 h, then add cobalt acetylacetonate, continue to stir and react for 2 - 3 h, filter by suction, collect the filtrate, remove the absolute ethanol, and obtain a composite base oil with cobalt salicylaldehyde propylenediamine uniformly dispersed therein; (2) Heat the composite base oil to 100 - 120 °C, and add a detergent-dispersant, a rust inhibitor, and an antifoaming agent under stirring to obtain a biodegradable high-temperature chain oil.

9. The preparation method of a degradable high-temperature chain oil according to claim 8, characterized in that: The dosage ratio of the total amount of the modified Rhodococcus oil and the modified Jatropha curcas oil, absolute ethanol, composite surfactant, salicylaldehyde, propylenediamine, and cobalt acetylacetonate is (13.2 - 14.5) g : (15 - 20) mL : (1.8 - 2.2) g : (0.36 - 0.55) mL : (0.12 - 0.18) mL : (0.82 - 1.23) g; the composite surfactant is composed of Tween 80, glycerol monostearate, and isopropanol in a mass ratio of (1 - 1.2) : (4 - 4.3) : (5 - 6).

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