A multifunctional tractor oil compound and its preparation method

Abstract

The present invention relates to the field of chemical engineering technology, and specifically relates to a multifunctional tractor oil compound and a preparation method thereof. The compound of the present invention comprises, by weight, 20 - 40 parts by weight of a detergent, 10 - 30 parts by weight of a dispersant, 7 - 14 parts by weight of an antioxidant, 18 - 28 parts by weight of zinc dialkyldithiophosphate, 5 - 14 parts by weight of a friction improver, and 1 - 10 parts by weight of a neutral base oil. The preparation method of the compound comprises adding the dispersant into a container, heating it to 50 - 65 °C while stirring, adding the detergent, antioxidant, base oil, zinc dialkyldithiophosphate and friction improver, maintaining at 50 - 65 °C, stirring for 2.5 - 3 hours, and filtering to obtain the multifunctional tractor oil compound. The tractor oil formulated with the multifunctional tractor oil compound of the present invention has excellent thermal oxidation stability, better extreme pressure and anti-wear performance, and excellent antioxidant performance, can extend the oil change period, and keep the friction performance in the whole temperature range of the transmission system.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical engineering, and particularly relates to a multifunctional tractor oil compound and a preparation method thereof. Background Art

[0002] Tractors are one of the important agricultural machinery in modern agriculture. Most domestic small and medium-sized tractors use hydraulic transmission dual-purpose oil. Large agricultural machinery companies such as John-Deere in the United States, New Holland in Italy, and Kubota in Japan have long used advanced technologies to produce large and medium-sized tractors. Large and medium-sized tractors need to use multifunctional tractor oil (UTTO) to meet their requirements for hydraulic - transmission - brake - shift oil. Therefore, multifunctional tractor oil needs to have excellent antioxidant, anti-wear, corrosion prevention properties and brake characteristics, balance the friction characteristics of the oil, and have a smaller tendency to generate sludge and paint film. At present, domestic research and production of large and medium-sized tractors have also started, but their special oils are almost all products produced with imported compound agents. At present, the research and development of domestic general-purpose multifunctional tractor oil is in its infancy, and there is a large gap compared with foreign general-purpose multifunctional tractor oil in terms of thermal oxidation stability, brake characteristics, and friction characteristics of the oil.

[0003] At present, general-purpose multifunctional tractor oil generally has poor thermal oxidation stability, short service life, and unstable friction durability characteristics of the oil at all temperatures, which will lead to a shorter clutch / brake engagement time and a possibility of slipping, and will also increase the tendency of tremors and noises during the tractor braking process. Therefore, it is necessary to develop a multifunctional tractor oil with high thermal oxidation stability and excellent friction characteristics to meet the requirements of large and medium-sized tractors for hydraulic - transmission - brake - shift oil. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned existing technologies, the present invention aims to provide a multifunctional tractor oil compound and a preparation method thereof to solve the problems of poor thermal oxidation stability, short service life, and unstable friction durability characteristics of the oil at all temperatures of the existing tractor oil.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] In the first aspect, the present invention provides a multifunctional tractor oil compound, which includes, by weight:

[0007] 20 - 40 parts by weight of a detergent;

[0008] 10 - 30 parts by weight of a dispersant;

[0009] 7 - 14 parts by weight of an antioxidant;

[0010] 18 - 28 parts by weight of zinc dialkyldithiophosphate;

[0011] 5 to 14 parts by weight of a friction improver;

[0012] 1 to 10 parts by weight of a neutral base oil.

[0013] As an implementable mode, the dispersant is at least one of monoalkenyl succinimide and high molecular weight polyisobutylene succinimide.

[0014] As an implementable mode, the antioxidant is at least one of butyl, octyl diphenylamine, dinonyl diphenylamine, N-phenyl-α-naphthylamine, and isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

[0015] As an implementable mode, the zinc dialkyldithiophosphate is at least one of sulfur-phosphorus bis-octyl zinc salt, propyl-octyl secondary and primary alkyl zinc salt, and sulfur-phosphorus primary and secondary alkyl zinc salt.

[0016] As an implementable mode, the friction improver is at least one of borate ester, ashless fatty amine, and ethylene glycol oleate.

[0017] As an implementable mode, the detergent is at least one of boronated overbased synthetic calcium sulfonate, overbased calcium alkylsalicylate, and calcium sulfonated alkylphenol.

[0018] As an implementable mode, the antioxidant is dinonyl diphenylamine, N-phenyl-α-naphthylamine, and isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate; the dispersant is monoalkenyl succinimide and high molecular weight polyisobutylene succinimide; the detergent is boronated overbased synthetic calcium sulfonate; the zinc dialkyldithiophosphate is sulfur-phosphorus primary and secondary alkyl zinc salt; the friction improver is borate ester and ethylene glycol oleate.

[0019] In a second aspect, the present invention provides a multifunctional tractor oil, comprising the multifunctional tractor oil compound agent described above.

[0020] As an implementable mode, the multifunctional tractor oil comprises, by weight:

[0021] 3 parts by weight of the multifunctional tractor oil compound agent;

[0022] 40 parts by weight of Group II 150N base oil;

[0023] 54 parts by weight of Group II 500N base oil;

[0024] 2.5 parts by weight of a viscosity index improver;

[0025] 0.5 part by weight of a pour point depressant;

[0026] and 200 ppm of a methacrylate antifoaming agent.

[0027] Thirdly, the present invention provides a preparation method of the multifunctional tractor oil compounding agent, which includes adding a dispersant into a container, heating the mixture to 50 - 65°C while stirring, adding a detergent, an antioxidant, a base oil, zinc dialkyldithiophosphate and a friction improver, maintaining the temperature at 50 - 65°C, stirring for 2.5 - 3 hours, and filtering to obtain the multifunctional tractor oil compounding agent.

[0028] The beneficial effects of the present invention are as follows:

[0029] The multifunctional tractor oil compounding agent of the present invention is prepared by compounding dinonyldiphenylamine, N - phenyl - α - naphthylamine, and isooctyl β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate. These three antioxidants have good synergistic effects when compounded;

[0030] The multifunctional tractor oil compounding agent of the present invention is prepared by compounding borate ester and ethylene glycol oleate, which has synergistic properties, and the friction performance of the oil sample is significantly improved;

[0031] The tractor oil formulated with the multifunctional tractor oil compounding agent of the present invention has excellent thermal oxidation stability, can improve the quality of the oil product, and extend the operation life of the tractor;

[0032] The multifunctional tractor oil compounding agent of the present invention can provide better extreme pressure and anti - wear performance for tractor oil, and can meet the extreme pressure and anti - wear performance requirements of the gear sets and hydraulic pumps of large and medium - sized tractors;

[0033] The multifunctional tractor oil compounding agent of the present invention can provide excellent antioxidant performance for tractor oil and extend the oil change cycle;

[0034] The multifunctional tractor oil compounding agent of the present invention can maintain the friction performance of the transmission system of tractor oil within the full temperature range, and has excellent shift feeling and wet brake performance. Detailed implementation manners

[0035] The following further elaborates the present invention with reference to specific embodiments.

[0036] It should be noted that these embodiments are only used to illustrate the present invention, rather than limiting the present invention. Under the premise of the concept of the present invention, simple improvements to this method all fall within the scope protected by the present invention.

[0037] The composition of the multifunctional tractor oil compounding agent is as follows: detergent 20 - 40%, dispersant 10 - 30%, antioxidant 7 - 14%, zinc dialkyldithiophosphate 18 - 28%, friction improver 5 - 14%, and the balance is neutral base oil.

[0038] Among them, the function of the detergent is to neutralize the acidic oxidation products and acidic gums generated by high-temperature oxidation in the oil. At the same time, it has excellent high-temperature detergency and thermal stability, can promptly clean the paint film and deposits on the surface of the torque converter, shaft body, and vane pump of the hydraulic system, and can effectively control the increase in the viscosity of tractor oil. In addition, it can also improve the shifting feeling and wet braking performance of the tractor. The detergents used in this experiment include at least one of calcium borated overbased synthetic sulfonate (300TBN), calcium overbased alkyl salicylate (300TBN), and calcium sulfonated alkylphenol (300TBN).

[0039] Among them, the function of the dispersant can meet the requirements of the oil for cleanliness and dispersibility under high and low temperature conditions, inhibit the formation of carbon deposits and paint films on the surface of the torque converter and vane pump of the hydraulic system, and can effectively control the increase in the viscosity of tractor oil. The dispersants used in this experiment include at least one of monoalkenyl succinimide and high molecular weight polyisobutylene succinimide.

[0040] Among them, the function of the antioxidant is to improve the antioxidant and anti-aging ability of tractor oil, reduce the tendency of sludge and paint film formation, and extend the service life of tractor oil. The antioxidants used in this experiment include at least one of butyl, octyl diphenylamine, dinonyl diphenylamine, N-phenyl-α-naphthylamine, and isooctyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate.

[0041] Among them, zinc dialkyldithiophosphate provides anti-wear and antioxidant properties for tractor oil, and can quickly form a boundary adsorption film or a chemical reaction film under low-speed heavy load or impact load of the gear mechanism to prevent tooth surface wear, scuffing, and galling. At the same time, it can inhibit the formation of paint films and sludge in tractor oil, and also protect against wear of the hydraulic pump. The zinc dialkyldithiophosphates used in this experiment include at least one of sulfur-phosphorus bis-octyl zinc salt, propyl-octyl secondary-tertiary alkyl zinc salt, and sulfur-phosphorus primary-secondary alkyl zinc salt.

[0042] Among them, the friction improver can improve the anti-wear and friction reduction effect of tractor oil. The friction improvers used in this experiment are at least one of borate ester, ashless fatty amine, and ethylene glycol oleate.

[0043] Among them, the neutral base oil includes but is not limited to at least one of 150N and 150SN. Among them, N refers to the neutral oil viscosity grade expressed by the Saybolt viscosity (seconds) at 37.8 °C (100 °F), such as 150N, 100N, 500N. SN refers to paraffinic neutral oil, and its viscosity is divided by the kinematic viscosity at 40 °C.

[0044] The preparation method of the multi-functional tractor oil compound (UTTO) is as follows: Add a dispersant into a container, heat it to 50 - 65 °C while stirring, and simultaneously add a detergent, an antioxidant, a base oil, zinc dialkyldithiophosphate, and a friction modifier in sequence; maintain the temperature at 50 - 65 °C and stir for 2.5 - 3 hours, and obtain the multi-functional tractor oil compound product through filtration.

[0045] The compound agents of the following examples were respectively formulated into multi-functional tractor oil (UTTO), as shown in Table 1. The oil formulation is: 3.0% of the compound agent, 40% of Formosa Plastics Group type II 150N base oil, 54% of Formosa Plastics Group type II 500N base oil, 2.5% of a viscosity index improver, 0.5% of a pour point depressant, and additionally 200 ppm of a methacrylate antifoaming agent needs to be added.

[0046] Table 1 Component ratios of the multi-functional tractor oil compound agents of Examples 1 - 5 (based on 100 parts by total mass)

[0047]

[0048]

[0049] The oxidation induction period of the samples was respectively tested according to the SH / T 0719 - PDSC method. The longer the time, the better the antioxidant performance. The oxidation stability of the lubricating oil was determined by the CECL - 48 - 00 - DKA oxidation method. The smaller the viscosity change rate and the smaller the increase in acid value, the better the oxidation stability. The test results are shown in Table 2.

[0050] Table 2 Comparison of antioxidant performance

[0051]

[0052]

[0053] It can be seen from Tables 1 and 2 that it can be seen from Examples 1, 2, and 3 that the PDSC and DKA oxidation results of the compound of dinonyldiphenylamine, N - phenyl - α - naphthylamine, and isooctyl β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate are the best, and these three antioxidants have good synergistic effects; the total antioxidant content was reduced in Example 4, and both the PDSC and DKA oxidation results were significantly reduced. The total antioxidant content was increased in Example 5, and the PDSC and DKA oxidation results hardly increased, indicating that increasing the total amount of antioxidants within a certain range can improve the antioxidant performance, and the improvement of antioxidant performance is not obvious when the antioxidants are in excess.

[0054] The compound agents of the following examples were respectively formulated into multi-functional tractor oil (UTTO), as shown in Table 3.

[0055] Table 3 Component ratios of the multi-functional tractor oil compound agents of Examples 3, 6 - 11

[0056]

[0057]

[0058] The oxidation stability of the lubricating oil was measured according to the CEC L-48-00-DKA oxidation method, and the friction performance of the lubricating oil for non-road vehicles was evaluated according to GB / T 35472.6. μE is the dynamic friction coefficient, and μM is the static friction coefficient. The closer the E / M value is to 1, the better the friction performance of the oil. The test results are shown in Table 4.

[0059] Table 4 Comparison of thermal oxidation stability and friction performance

[0060]

[0061] It can be seen from Tables 3 and 4 that in Examples 3, 6, and 7, it can be seen that using borated overbased calcium sulfonate can significantly improve the DKA oxidation stability and friction performance of the oil. The boron element in borated overbased calcium sulfonate can keep the friction coefficient of the oil more stable; in Example 8, the content of borated overbased calcium sulfonate was reduced, the DKA oxidation result decreased, and the range of the E / M value became larger. In Example 9, the content of borated overbased calcium sulfonate was increased, and the DKA oxidation result and the E / M value hardly changed. It can be seen from Examples 3, 10, and 11 that after the monoalkenyl succinimide and the high molecular weight polyisobutylene succinimide are compounded, the viscosity change rate of the DKA oxidation of the oil sample is lower and the increase in acid value is smaller, indicating that the antioxidant ability of the oil sample can be improved after the two dispersants are compounded.

[0062] The compound agents of the following examples were respectively formulated into multifunctional tractor oils (UTTO), as shown in Table 5.

[0063] Table 5 Component ratios of the compound agents of the multifunctional tractor oils in Examples 11-15

[0064]

[0065] According to GB / T 3142 - Determination of the load-carrying capacity of lubricants (four-ball machine method), the maximum non-seizure load of the sample was measured, and the result was PB (kg). The larger the value, the better the load-carrying capacity performance. The test results are shown in Table 6.

[0066] Table 6 Comparison of anti-wear performance and antioxidant performance

[0067]

[0068] As can be seen from the comparison of the data of Examples 11, 12, and 13 in Table 6, the use of zinc dialkyldithiophosphate with sulfur and phosphorus has excellent extreme pressure and anti-wear properties and antioxidant properties. At the same time, from the comparison of the data of Examples 13, 14, and 15, it can be seen that when the content of zinc dialkyldithiophosphate with sulfur and phosphorus is reduced, the PB value of the oil sample decreases significantly. When its content is increased, the PB value does not increase, indicating that increasing the total amount of zinc dialkyldithiophosphate with sulfur and phosphorus within a certain range can improve the load-carrying capacity and antioxidant properties, and when the zinc dialkyldithiophosphate with sulfur and phosphorus is in excess, it has little effect on the load-carrying capacity and antioxidant properties. In addition, from the comparison results of the friction characteristics, different types of zinc dialkyldithiophosphates have little effect on the friction characteristics.

[0069] The compound agents of the following examples were respectively formulated into multi-functional tractor oils (UTTO), as shown in Table 7.

[0070] Table 7 Composition ratios of the compound agents of the multi-functional tractor oils in Examples 13 - 20

[0071]

[0072]

[0073] According to GB / T35472.6, the friction performance of non-road vehicle lubricating oils was evaluated. μE is the dynamic friction coefficient, μM is the static friction coefficient, and the closer the E / M value is to 1, the better the friction performance of the oil product. The larger μE is, the smaller the possibility of clutch slippage; the larger μM is, the stronger the load-bearing capacity of the clutch. The test results are shown in Table 8.

[0074] Table 8 Comparison of friction characteristics

[0075]

[0076]

[0077] As can be seen from the comparison of the data of Examples 13, 16, and 17 in Table 8, from the perspectives of μE, μM, and E / M values, the friction performance of using borate and ethylene glycol oleate alone is better than that of ashless fatty amines. From the comparison of the data of Examples 18, 19, and 20, after the borate and ethylene glycol oleate are compounded, they have synergy, and the friction performance of the oil sample is significantly improved.

[0078] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described by referring to the preferred embodiments of the present invention, those of ordinary skill in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. A multifunctional tractor oil compound, characterized in that, comprising by weight: 20 - 40 parts by weight of a detergent; 10 - 30 parts by weight of a dispersant; 7 - 14 parts by weight of an antioxidant; 18 - 28 parts by weight of zinc dialkyldithiophosphate; 5 - 14 parts by weight of a friction improver; 1 - 10 parts by weight of a neutral base oil; The antioxidant is dinonyl diphenylamine, N - phenyl - α - naphthylamine and isooctyl β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate; the dispersant is monoalkenyl succinimide and high - molecular - weight polyisobutylene succinimide; the detergent is borated overbased synthetic calcium sulfonate; the friction improver is boric acid ester and ethylene glycol oleate.

2. The multifunctional tractor oil compound according to claim 1, characterized in that, the zinc dialkyldithiophosphate is at least one of sulfur - phosphorus bis - octyl zinc salt, propyl - octyl secondary - primary alkyl zinc salt, and sulfur - phosphorus primary - secondary alkyl zinc salt.

3. The multifunctional tractor oil compound according to claim 1, characterized in that, the zinc dialkyldithiophosphate is sulfur - phosphorus primary - secondary alkyl zinc salt.

4. A multifunctional tractor oil, characterized in that, comprising the multifunctional tractor oil compound according to any one of claims 1 - 3.

5. The multifunctional tractor oil according to claim 4, characterized in that, comprising by weight: 3 parts by weight of the multifunctional tractor oil compound according to any one of claims 1 - 3; 40 parts by weight of type II 150N base oil; 54 parts by weight of type II 500N base oil; 2.5 parts by weight of a viscosity index improver; 0.5 parts by weight of a pour point depressant; and 200 ppm of a methacrylate antifoaming agent.

6. The preparation method of the multifunctional tractor oil compound according to any one of claims 1 - 3, characterized in that, comprising adding a dispersant into a container, heating to 50 - 65 °C while stirring, adding a detergent, an antioxidant, a base oil, zinc dialkyldithiophosphate and a friction improver, maintaining at 50 - 65 °C, stirring for 2.5 - 3 hours, and filtering to obtain the multifunctional tractor oil compound.

Images