A stain-free bearing gear oil composition for aluminum rolling and a method for preparing and using the same

Abstract

The present application belongs to the technical field of lubricating oil, and relates to an aluminum rolling stain-free bearing and gear oil composition, a preparation method thereof and application. The aluminum rolling stain-free bearing and gear oil composition of the present application is composed of base oil and additives; the base oil is composed of mineral oil and synthetic oil; the mineral oil is selected from group II oil and / or industrial white oil; the synthetic oil is polyisobutylene; the total naphthenic hydrocarbon content of the mineral oil is less than or equal to 80% by mass percentage; the kinematic viscosity at 40 DEG C is less than or equal to 15 mm 2 / s. The preparation of the stain-free bearing and gear oil is realized by limiting the naphthenic hydrocarbon and viscosity of the mineral oil in the base oil, while effectively reducing the cost; in addition, by selecting the base oil and additives, the shear resistance and extreme pressure and wear resistance are further improved, and the comprehensive performance is excellent.

Description

Technical Field

[0001] This invention belongs to the field of lubricating oil technology, and relates to a stain-free bearing gear oil composition for aluminum rolling, its preparation method and application. Background Technology

[0002] During the cold rolling of aluminum sheet, strip, and foil, gear oil in the roll bearings and hydraulic oil in the hydraulic system can easily leak into the rolling process oil due to sealing compatibility issues. This leads to oil stains on the surface of the aluminum sheet, strip, and foil, affecting product quality and shortening the service life of the rolling process lubricating oil. Therefore, a "stain-free" requirement has been put forward for both bearing gear oil and hydraulic oil used in aluminum rolling, which plays a crucial role in extending the service life of the rolling process lubricating oil and improving the quality of aluminum sheet, strip, and foil.

[0003] Compared to conventional gear oils, stain-free bearing gear oils for aluminum rolling mills must first meet the requirement of being "stain-free," and secondly, they must meet the extreme pressure anti-wear properties, rust and corrosion prevention properties, and viscosity-temperature characteristics required of conventional gear oils. Compared to stain-free hydraulic oils (common viscosity grades are 32 and 46), stain-free bearing gear oils, due to their higher viscosity (common viscosity grades are 220 and 320), face greater difficulty in achieving a "stain-free" effect in terms of high-temperature annealing detergency.

[0004] To meet the "stain-free" requirement for bearing gear oils, improvements to the base oil and additives are typically necessary. Base oils include mineral oils, synthetic oils, and semi-synthetic oils blended from both. Currently, most products use polyalphaolefins as the base oil. While this provides good viscosity-temperature characteristics and lubricity, the high viscosity of polyalphaolefins easily leaves black stains on the aluminum foil surface, failing to meet the cleaning requirements of the aluminum rolling process during annealing.

[0005] In addition, some products use water-soluble or oil-soluble polyethers as base oils. For example, Chinese invention patent application CN104450019A discloses a synthetic stain-free bearing oil for aluminum rolling mills and its preparation method. It uses a synthetic stain-free PAG base oil, an ashless antioxidant to prevent oxidation, a high-efficiency extreme pressure agent to protect the bearing housing and gears, and a corrosion inhibitor to prevent oxidation and deterioration of the equipment. Another Chinese invention patent CN106947578B discloses a stain-free bearing oil for non-ferrous metal processing and its preparation method, which uses a novel oil-soluble polyether (a copolymer of BO and PO with triol as the initiator) as its main component.

[0006] Although PAG base oils perform well in high-temperature annealing, water-soluble polyethers have poor compatibility with other additives and can cause precipitation and stratification when mixed with other oily products, which limits their application. On the other hand, oil-soluble polyethers are expensive and difficult to use in actual industrial production.

[0007] Therefore, further research is needed on bearing gear oils for aluminum rolling mills that have high requirements for "stain-free" performance. Summary of the Invention

[0008] This invention addresses the problems existing in the prior art by providing a stain-free bearing gear oil composition for aluminum rolling, its preparation method, and its application. The "stain-free" bearing gear oil is prepared by adjusting the base oil and limiting characteristic parameters. Furthermore, by selecting the base oil and additives, the shear resistance and extreme pressure anti-wear properties are further improved, resulting in excellent overall performance.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows:

[0010] This invention provides a stain-free bearing gear oil composition for aluminum rolling, comprising a base oil and additives; the base oil comprises mineral oil and synthetic oil.

[0011] The mineral oil is selected from Group II oils and / or industrial white oil; the synthetic oil is polyisobutylene.

[0012] The total cycloalkanes content of the mineral oil is ≤80wt%; the kinematic viscosity at 40℃ is ≤15mm. 2 / s.

[0013] Preferably, the total cycloalkanes content of the mineral oil is 50-80 wt%; the kinematic viscosity at 40°C is 7-15 mm. 2 / s.

[0014] In this invention, the high-temperature detergency of bearing gear oil is improved by controlling the total cycloalkanes content and viscosity of the mineral oil in the composition; at the same time, by further limiting the above parameters, the cost is effectively reduced while ensuring the high-temperature detergency of bearing gear oil.

[0015] Preferably, the polyisobutylene has a molecular weight ≤1500.

[0016] More preferably, the number-average molecular weight of the polyisobutylene is 700-1500.

[0017] More preferably, the polyisobutylene has a number-average molecular weight of 900-1400.

[0018] In this invention, the shear resistance of bearing gear oil is improved by controlling the molecular weight of the synthetic oil—polyisobutylene—in the composition. At the same time, by further limiting the molecular weight of polyisobutylene, the cost is effectively reduced while ensuring the high-temperature detergency and shear resistance of the bearing gear oil.

[0019] Furthermore, the additives include one or more of the following: solubilizers, extreme pressure anti-wear agents, rust and corrosion inhibitors, and antifoaming agents.

[0020] Preferably, the stain-free bearing gear oil composition for aluminum rolling comprises, by weight percentage: 93.25-97.13% base oil, 2.0-4.0% solubilizer, 0.8-2.6% extreme pressure anti-wear agent, 0.05-0.1% rust and corrosion inhibitor, and 0.02-0.05% antifoaming agent.

[0021] More preferably, the stain-free bearing gear oil composition for aluminum rolling comprises, by weight percentage: 30-55% mineral oil, 38.25-67.13% synthetic oil, 2.0-4.0% solubilizer, 0.8-2.6% extreme pressure anti-wear agent, 0.05-0.1% rust and corrosion inhibitor, and 0.02-0.05% antifoaming agent.

[0022] Furthermore, the solubilizer is selected from diesters and / or polyol esters, and has a kinematic viscosity of 15-30 mmHg at 40°C. 2 / s; the extreme pressure anti-wear agent is selected from dibasic acid and / or ammonium phosphate; the rust and corrosion inhibitor is selected from dodecenyl succinate half ester, liquid alkenyl succinate half ester and / or benzotriazole derivative; the antifoaming agent is selected from polysiloxane and / or polyacrylate.

[0023] Preferably, the extreme pressure anti-wear agent is a dibasic acid and ammonium phosphate; the use of this extreme pressure anti-wear agent further enhances the extreme pressure anti-wear performance of bearing gear oil, resulting in excellent overall performance.

[0024] More preferably, the mass ratio of the dicarboxylic acid to ammonium phosphate is 1:2-3.

[0025] More preferably, the dicarboxylic acid has 20-30 carbon atoms; the phosphate amine is one or more of isooctyl acid phosphate octadecylamine salt, short-chain alkylamine phosphate, or aromatic phosphate amine.

[0026] This invention also provides a method for preparing a stain-free bearing gear oil composition for aluminum rolling, specifically including the following steps:

[0027] (1) Heat and stir the base oil until it is uniform and transparent, then add the solubilizer, extreme pressure anti-wear agent and rust and corrosion inhibitor in sequence, and stir to mix evenly;

[0028] (2) Cool down, add antifoaming agent, stir and mix evenly to obtain the final product.

[0029] Furthermore, in step (1), the heating temperature is 50-70℃; the stirring time is 2-4h.

[0030] Furthermore, in step (2), the cooling temperature is 35-45℃; the stirring time is 1-2h.

[0031] The present invention also provides the application of the above-mentioned stain-free bearing gear oil composition for aluminum rolling or the stain-free bearing gear oil composition for aluminum rolling prepared by the above preparation method in the processing of aluminum sheet, strip and foil.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] This invention achieves excellent high-temperature detergency in the prepared composition by controlling the basic parameters of mineral oil in the base oil (total cycloalkanes content and kinematic viscosity); further, it achieves excellent shear resistance in the prepared composition by controlling the basic parameters of synthetic oil in the base oil (molecular weight); and further, it endows the composition with even better extreme pressure anti-wear properties by selecting additives—extreme pressure anti-wear agents, namely, by compounding diacids and ammonium phosphates.

[0034] In summary, the stain-free bearing gear oil composition prepared by this invention has excellent high-temperature annealing cleaning properties, shear resistance, extreme pressure anti-wear properties, rust and corrosion prevention properties, and anti-foaming properties, and has outstanding cost performance. It can fully meet the lubrication requirements of roll bearings in the aluminum rolling process, while reducing surface contamination of rolled products and improving the product qualification rate. Attached Figure Description

[0035] Figure 1 The results of the high-temperature cleaning properties test of the aluminum foil of the present invention are shown; wherein, A is Example 1, B is Example 2, C is Example 3, D is a commercially available product from abroad, and E is ordinary gear oil;

[0036] Figure 2 The results of the high-temperature cleaning properties test of the aluminum foil of the present invention are shown; wherein, A is Example 2, B is Comparative Example 1, and C is Comparative Example 2;

[0037] Figure 3 The results of the high-temperature cleaning properties test of the aluminum foil of the present invention are shown; wherein, A is Example 2, B is Comparative Example 3, and C is Comparative Example 4. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] The sources of raw materials for the comparative examples of this invention are as follows:

[0040] HVI H2 was purchased from Daqing Branch of China Petroleum Lubricating Oil Company; No. 5, No. 10, No. 15, and No. 22 industrial white oils were purchased from Hebei Feitian Petrochemical Group Co., Ltd.; polyisobutylene was purchased from Daelim Co., Ltd. (Korea); Priolube 3970 was purchased from Croda Co., Ltd.; NYCO 5750 was purchased from NYCO Petroleum Company (France); A51 was purchased from ExxonMobil; isooctyl acid phosphate octadecylamine salt was purchased from Jinzhou Shengda Chemicals Co., Ltd.; short-chain alkylamine phosphate and aromatic amine phosphate were purchased from Vanderbilt (Beijing) Trading Co., Ltd.; DIACID 1550 was purchased from Medveswick Co., Ltd.; IR39 and L12 were purchased from BASF; T747 was purchased from Jinzhou Chenghua New Materials Co., Ltd.; T551 was purchased from Beijing Xingpu Fine Chemical Technology Development Co., Ltd.; AF520 was purchased from Qingdao Degussa Chemical Co., Ltd. (Qingdao Evonik Chemical Co., Ltd.); FOAM BAN 159 and FOAM BAN 152 were purchased from Mengqingxin Additives Trading (Shanghai) Co., Ltd.

[0041] Example 1

[0042] The stain-free bearing gear oil composition for aluminum rolling was prepared according to the composition in Table 1. The specific preparation method is as follows:

[0043] The base oil components are added sequentially to a stainless steel mixing vessel equipped with a stirrer. While stirring, the temperature is raised to 70°C and stirred until uniform and transparent. At 70°C, the solubilizer, extreme pressure anti-wear agent, and rust and corrosion inhibitor are added sequentially, and stirring is continued for 4 hours. While stirring, the temperature is lowered to 40°C, and the antifoaming agent is added. Stirring is continued for 2 hours to obtain a stain-free bearing gear oil composition.

[0044] Example 2

[0045] The stain-free bearing gear oil composition for aluminum rolling was prepared according to the composition in Table 1. The specific preparation method is as follows:

[0046] The base oil components are added sequentially to a stainless steel mixing vessel equipped with a stirrer. While stirring, the temperature is raised to 60°C and stirred until uniform and transparent. At 60°C, the solubilizer, extreme pressure anti-wear agent, and rust and corrosion inhibitor are added sequentially, and stirring is continued for 3 hours. While stirring, the temperature is lowered to 35°C, and the antifoaming agent is added. Stirring is continued for 1 hour to obtain a stain-free bearing gear oil composition.

[0047] Example 3

[0048] The stain-free bearing gear oil composition for aluminum rolling was prepared according to the composition in Table 1. The specific preparation method is as follows:

[0049] The base oil components are added sequentially to a stainless steel blending vessel equipped with a stirrer. While stirring, the temperature is raised to 55°C and stirred until uniform and transparent. At 55°C, the solubilizer, extreme pressure anti-wear agent, and rust and corrosion inhibitor are added sequentially, and stirring is continued for 4 hours. While stirring, the temperature is lowered to 45°C, and the antifoaming agent is added. Stirring is continued for 1.5 hours to obtain a stain-free bearing gear oil composition.

[0050] Table 1. Composition of Stain-Free Bearing Gear Oil for Aluminum Rolling Mills

[0051]

[0052]

[0053] The stain-free bearing gear oil compositions for aluminum rolling prepared in Examples 1-3 and commercially available foreign products were subjected to comprehensive performance tests. The test results are shown in Table 2.

[0054] High-Temperature Cleanliness Test of Aluminum Foil: Take a 70mm×70mm aluminum foil, fold it into a 50mm×50mm square box, clean it with petroleum ether and dry it before placing it in the aluminum box. Take 0.25g of test oil (the stain-free bearing gear oil composition for aluminum rolling prepared in Examples 1-3, commercially available foreign products, and ordinary gear oil), spread it evenly on the surface of the aluminum foil, and then place it in a muffle furnace. Maintain the temperature at 340℃±5℃ for 0.5h, then remove it. After cooling to room temperature, observe the morphology of the aluminum foil. The results are shown in […]. Figure 1 .

[0055] Table 2. Performance test results of the stain-free bearing gear oil compositions prepared in Examples 1-3 and commercially available foreign products.

[0056]

[0057]

[0058] from Figure 1 As shown in Table 2, the stain-free bearing gear oil composition for aluminum rolling provided by this invention produces light yellow stains on the surface of aluminum foil after high-temperature treatment, with a rating of Grade 2; while commercially available products from abroad produce brown stains on the aluminum foil surface, with a rating of Grade 3; and ordinary gear oil produces black stains on the surface, with a rating of Grade 6. To better differentiate the annealing cleaning properties of different oils, the above tests were conducted directly using the undiluted stain-free bearing gear oil without mixing it with the rolling process oil. In actual production, the proportion of bearing gear oil mixed with rolling process oil generally does not exceed 10%. The stain-free bearing gear oil composition provided by this invention, after mixing with the rolling process oil, produces virtually no obvious stains on the aluminum foil surface, demonstrating excellent annealing cleaning properties.

[0059] As can also be seen from Table 2, the stain-free bearing gear oil composition for aluminum rolling provided by the present invention also has excellent shear resistance (low relative viscosity loss, less than 1.3%) and extreme pressure anti-wear properties (small wear scar diameter and high sintering load, wherein, in Example 2, the sintering load P) D It can reach 3924N, and the sintering load of Example 1 also reached 2453N, which meets the requirement of not less than 2450N for sintering load in the national standard GB 5903 for gear oil, and can fully meet the lubrication requirements of the roll bearing; at the same time, it also has good rust and corrosion resistance (copper strip corrosion) and anti-foaming properties.

[0060] In practical applications, the most common type of stain-free bearing gear oil for aluminum rolling is grade 320. Example 2 uses grade 320 stain-free bearing gear oil, and the following comparative examples are all compared with Example 2.

[0061] Comparative Example 1

[0062] The only difference between this comparative example and Example 2 is the composition and amount of the base oil.

[0063] Base oil 94.79%: specifically 46.79% of No. 10 industrial white oil (85% naphthenes, kinematic viscosity 10.08 mm at 40°C). 2 / s) with 48% polyisobutylene (Mn is 1300).

[0064] Comparative Example 2

[0065] The only difference between this comparative example and Example 2 is the composition and amount of the base oil.

[0066] Base oil 94.79%: specifically 39.19% No. 10 industrial white oil (37% naphthenes, kinematic viscosity 10.15 mm at 40°C). 2 / s) with 55.6% polyisobutylene (Mn is 1300).

[0067] The high-temperature detergency test results of the stain-free bearing gear oil compositions prepared in Comparative Examples 1 and 2 are shown in the figure. Figure 2 And Table 3.

[0068] Table 3. High-temperature detergency results of the stain-free bearing gear oil compositions of Comparative Examples 1 and 2

[0069] project Example 2 Comparative Example 1 Comparative Example 2 Test methods Viscosity grade 320 320 320 GB / T 3141 Aluminum foil high-temperature cleaning performance (340℃) / grade 2 3 2 Q / SY RH17ZB 2046-2023

[0070] From Table 3 and Figure 2 As can be seen, the different naphthenic content of No. 10 industrial white oil leads to significant differences in the thickening effect of polyisobutylene on mineral oils of the same viscosity grade. It should be noted that, in order to achieve the same viscosity grade (VG320) for the finished oils, the polyisobutylene content decreases as the naphthenic content of the mineral oil increases.

[0071] Compared to Example 2, Comparative Example 1 used a No. 10 industrial white oil with a higher cycloalkanes content (reaching 85%), resulting in deeper brown stains on the surface of the finished oil aluminum foil and a decrease in high-temperature annealing detergency, downgrading from grade 2 to grade 3. Comparative Example 2 used a No. 10 industrial white oil with a lower cycloalkanes content (37%). Although it still performed well in high-temperature annealing detergency, the thickening ability of polyisobutylene on the mineral oil decreased. To achieve a viscosity grade of 320, more polyisobutylene needed to be added, an increase of 5.6% compared to Example 2, leading to increased costs. Therefore, controlling the cycloalkanes content of the mineral oil within an appropriate ratio allows the finished oil to achieve optimal performance within a controllable cost range; ideally, the cycloalkanes content in the base oil should be 50-80%.

[0072] Comparative Example 3

[0073] The only difference between this comparative example and Example 2 is the composition and amount of the base oil.

[0074] Base oil 94.79%: specifically 50.79% of No. 22 industrial white oil (kinematic viscosity 22.36 mmHg at 40°C). 2 / s) with 44% polyisobutylene (Mn is 1300).

[0075] Comparative Example 4

[0076] The only difference between this comparative example and Example 2 is the composition and amount of the base oil.

[0077] Base oil 94.79%: specifically 38.79% No. 5 industrial white oil (kinematic viscosity 5.132 mm at 40°C). 2 / s), with 56% polyisobutylene (Mn is 1300).

[0078] The high-temperature detergency test results of the stain-free bearing gear oil compositions prepared in Comparative Examples 3 and 4 are shown in the figure. Figure 3 And Table 4.

[0079] Table 4. High-temperature detergency results of the stain-free bearing gear oil compositions prepared in Comparative Examples 3 and 4

[0080] project Example 2 Comparative Example 3 Comparative Example 4 Test methods Viscosity grade 320 320 320 GB / T 3141 Aluminum foil high-temperature cleanliness / grade 2 4 2 Q / SY RH17ZB 2046-2023

[0081] From Table 4 and Figure 3 As can be seen, in Comparative Example 3, the base oil was replaced with No. 22 industrial white oil. The stains on the aluminum foil surface changed from light yellow to light brown, and the rating changed from level 2 to level 4. The detergency after high-temperature annealing deteriorated drastically, failing to meet the requirements of actual working conditions. In Comparative Example 4, the viscosity of the base oil decreased to 5 mm. 2The aluminum foil cleaning performance was slightly better than in Example 2 at around / s, but the addition of polyisobutylene (Mn 1300) increased by 6%, leading to increased costs. It is evident that the viscosity of the mineral oil in the base oil must be controlled within a suitable range to achieve the optimal cost-effectiveness; that is, the preferred viscosity of the mineral oil in the base oil is 7-15 mm. 2 / s.

[0082] Comparative Example 5

[0083] The only difference between this comparative example and Example 2 is the composition and amount of the base oil.

[0084] Base oil 94.79%: Specifically, 54.79% of No. 10 industrial white oil (70.5% naphthenes, kinematic viscosity at 40°C 10.15 mm). 2 / s) with 40% polyisobutylene (Mn is 2400).

[0085] The results of the shear resistance test of the stain-free bearing gear oil composition prepared in Comparative Example 5 are shown in Table 5.

[0086] Table 5 shows the shear resistance results of the stain-free bearing gear oil composition prepared in Comparative Example 5.

[0087] project Example 2 Comparative Example 5 Test methods Viscosity grade 320 320 GB / T 3141 Relative viscosity loss / % 1.2 12.8 NB / SH / T 0845

[0088] As can be seen from Table 5, after the molecular weight of polyisobutylene in Comparative Example 4 increased from 1300 to 2400, the relative viscosity loss decreased from 1.2% to 12.8%, and the shear resistance decreased significantly. It can be seen that the relative molecular weight of polyisobutylene has a very important influence on the shear resistance. In order to improve the shear resistance of oil, the molecular weight of polyisobutylene needs to be controlled within an appropriate range.

[0089] Comparative Example 6

[0090] The only difference between this comparative example and Example 2 is the use of different extreme pressure anti-wear additives; specifically, only 2.1% of the dicarboxylic acid DIACID 1550 is used.

[0091] Comparative Example 7

[0092] The only difference between this comparative example and Example 2 is the use of different extreme pressure anti-wear additives; specifically, only 2.1% of short-chain alkylamine phosphate is used.

[0093] The extreme pressure anti-wear test results of the stain-free bearing gear oil compositions prepared in Comparative Examples 6 and 7 are shown in Table 6.

[0094] Table 6 shows the extreme pressure anti-wear properties of the stain-free bearing gear oil compositions prepared in Comparative Examples 6 and 7.

[0095] project Example 2 Comparative Example 6 Comparative Example 7 Test methods Wear scar diameter (392N) / mm 0.41 0.39 0.56 NB / SH / T 0189 <![CDATA[Sintering load (P D ) / N]]> 3924 1668 3924 GB / T 3142

[0096] As can be seen from Table 6, when using dibasic acid alone, the sintering load P D The initial pressure is too low to meet the requirements of the working conditions; when ammonium phosphate is used alone, the wear scar diameter is too large, and the wear resistance is insufficient. Only when the two are combined can they exhibit excellent extreme pressure anti-wear properties and have a significant synergistic effect.

[0097] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A stain-free bearing gear oil composition for aluminum rolling, characterized in that, It consists of base oil and additives; the base oil is composed of mineral oil and synthetic oil. The mineral oil is selected from Group II oils and / or industrial white oil; the synthetic oil is polyisobutylene. The total cycloalkanes content of the mineral oil is ≤80wt%; kinematic viscosity at 40℃ is ≤15mm. 2 / s.

2. The stain-free bearing gear oil composition for aluminum rolling according to claim 1, characterized in that, The total cycloalkanes content of the mineral oil is 50-80 wt%; the kinematic viscosity at 40°C is 7-15 mm. 2 / s.

3. The stain-free bearing gear oil composition for aluminum rolling according to claim 1, characterized in that, The polyisobutylene has a number-average molecular weight of ≤1500.

4. The stain-free bearing gear oil composition for aluminum rolling according to claim 3, characterized in that, The polyisobutylene has a number-average molecular weight of 700-1500.

5. The stain-free bearing gear oil composition for aluminum rolling according to claim 4, characterized in that, The polyisobutylene has a number-average molecular weight of 900-1400.

6. The stain-free bearing gear oil composition for aluminum rolling according to any one of claims 1-5, characterized in that, The additives include one or more of the following: solubilizers, extreme pressure anti-wear agents, rust and corrosion inhibitors, and antifoaming agents.

7. The stain-free bearing gear oil composition for aluminum rolling according to claim 6, characterized in that, The stain-free bearing gear oil composition for aluminum rolling comprises, by weight percentage: 93.25-97.13% base oil, 2.0-4.0% solubilizer, 0.8-2.6% extreme pressure anti-wear agent, 0.05-0.1% rust and corrosion inhibitor, and 0.02-0.05% antifoaming agent.

8. The stain-free bearing gear oil composition for aluminum rolling according to claim 7, characterized in that, The stain-free bearing gear oil composition for aluminum rolling comprises, by weight percentage: 30-55% mineral oil, 38.25-67.13% synthetic oil, 2.0-4.0% solubilizer, 0.8-2.6% extreme pressure anti-wear agent, 0.05-0.1% rust and corrosion inhibitor, and 0.02-0.05% antifoaming agent.

9. The stain-free bearing gear oil composition for aluminum rolling according to claim 6, characterized in that, The solubilizer is selected from diesters and / or polyol esters, and has a kinematic viscosity of 15-30 mmHg at 40°C. 2 / s; the extreme pressure anti-wear agent is selected from dibasic acid and / or ammonium phosphate; the rust and corrosion inhibitor is selected from dodecenyl succinate half ester, liquid alkenyl succinate half ester and / or benzotriazole derivative; the antifoaming agent is selected from polysiloxane and / or polyacrylate.

10. The stain-free bearing gear oil composition for aluminum rolling according to claim 9, characterized in that, The extreme pressure anti-wear agent is a dibasic acid and ammonium phosphate.

11. The stain-free bearing gear oil composition for aluminum rolling according to claim 10, characterized in that, The mass ratio of the dicarboxylic acid to ammonium phosphate is 1:2-3.

12. The stain-free bearing gear oil composition for aluminum rolling according to claim 10, characterized in that, The dicarboxylic acid has 20-30 carbon atoms; the phosphate amine is one or more of isooctyl acid phosphate octadecylamine salt, short-chain alkylamine phosphate, or aromatic phosphate amine.

13. The method for preparing the stain-free bearing gear oil composition for aluminum rolling according to any one of claims 6-12, characterized in that, Includes the following steps: (1) Heat and stir the base oil until it is uniform and transparent, then add the solubilizer, extreme pressure anti-wear agent and rust and corrosion inhibitor in sequence, and heat and stir to mix evenly; (2) Cool down, add antifoaming agent, heat and stir to mix evenly, and you will get the product.

14. The preparation method according to claim 13, characterized in that, In step (1), the heating temperature is 50-70℃ and the stirring time is 2-4h.

15. The preparation method according to claim 13, characterized in that, In step (2), the cooling temperature is 35-45℃; the stirring time is 1-2h.

16. The application of the stain-free bearing gear oil composition for aluminum rolling according to any one of claims 1-12 or the stain-free bearing gear oil composition for aluminum rolling prepared by any one of claims 13-15 in the processing of aluminum sheet, strip and foil.

Images