Equal-molecule lubricating oil with optimized ratio and preparation method thereof

Abstract

The invention relates to equal-molecular lubricating oil with an optimized ratio and a preparation method of the equal-molecular lubricating oil, and belongs to the field of lubricating oil production, and the equal-molecular lubricating oil comprises the following substances in parts by weight: 30-50 parts of trimethylolpropane caprylic caprate; 20 to 30 parts of dioctyl sebacate; 20 to 30 parts of polypropylene glycol; 10 to 20 parts of methoxy polyethylene glycol; 12 to 18 parts of rosin pentaerythritol ester; 5 to 7 parts of cholesteryl caprylate; 3 to 5 parts of lauric acid imidazoline; 3 to 6 parts of dioctyl sodium sulfosuccinate; 5 to 9 parts of trioctyl phosphite; the molecular weight of all the selected substances is 400-600. The molecular weights of all the substances are 400-600, so that the difference of the molecular weights of the substances is small, and the substances can be uniformly dispersed after being mixed; meanwhile, the selected molecular weight section belongs to a moderate area, so that the lubricating oil is difficult to volatilize and can be stably used for a long time.

Description

Technical Field

[0001] The invention belongs to the field of lubricating oil production, in particular to an equimolecular optimized ratio lubricating oil and a preparation method thereof. Background Art

[0002] Lubricating oil plays a vital role in mechanical operation, reducing friction and wear and improving work efficiency. The performance of lubricating oil is closely related to the molecular weight of the selected substance. If the molecular weight of the lubricating oil is small, its boiling point is low and its volatility is strong. Especially at high temperatures, the oil in the crankcase and cylinder wall is easy to evaporate and enter the combustion chamber, increasing oil consumption, resulting in incomplete combustion, carbon deposits, engine smoke, and thus affecting the power and efficiency of the engine. At the same time, the viscosity is low, which makes it difficult to form a stable oil film at high temperatures, and it cannot effectively lubricate the friction surface of the engine, causing the oil film to break quickly under the action of load, making key components lose protection, accelerating wear, and affecting engine performance. In addition, the sealing performance is reduced due to the small molecular weight, which may lead to loose cylinder sealing and air leakage, damaging the power output of the engine, and may also cause harmful exhaust gas to penetrate into the crankcase, causing the oil quality to deteriorate and form sludge and colloidal substances. Lubricating oil is highly volatile, especially at high temperatures. The oil in the crankcase and cylinder wall is easy to evaporate and enter the combustion chamber, increasing the engine. Oil consumption leads to incomplete combustion, carbon deposits, engine smoke, and thus affects the power and efficiency of the engine; if the molecular weight of the lubricant is large, the lubricating performance at high temperatures may be insufficient, and it may not provide sufficient protection inside the engine, which may lead to increased wear inside the engine and even cause serious mechanical failure; at the same time, its fluidity at low temperatures is poor, which may affect its use effect in cold environments; and many existing lubricants ignore the molecular weight factor during the configuration process, which may lead to large differences in molecular weight between different raw materials, poor solubility after mixing, which may lead to stratification or formation of colloids, and the viscosity after mixing may deviate from the design value, resulting in oil film strength not meeting the standard, increased wear or increased energy consumption, and the stability may be poor after mixing, which may lead to faster oxidation of the lubricant and formation of sludge to clog the filter element or oil circuit. Therefore, how to formulate lubricants according to molecular weight is an urgent problem to be solved in the field of lubricants. Summary of the Invention

[0003] The present invention provides an equimolecular optimized ratio lubricating oil and a preparation method thereof, which are used to solve the defects in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A lubricating oil with an optimized equimolecular ratio comprises the following substances in parts by weight: 30-50 parts of trimethylolpropane octylcaprate; 20-30 parts of dioctyl sebacate; 20-30 parts of polypropylene glycol; 10-20 parts of methoxy polyethylene glycol; 12-18 parts of rosin pentaerythritol ester; 5-7 parts of cholesterol octanoate; 3-5 parts of lauric acid imidazoline; 3-6 parts of sodium dioctyl sulfosuccinate; and 5-9 parts of trioctyl phosphite. The molecular weight of all the selected substances is between 400 and 600.

[0006] In the above-mentioned equimolecular optimized ratio lubricating oil, the molecular weight of the trimethylolpropane octanedioate is 451.

[0007] In the above-mentioned equimolecular optimized ratio lubricating oil, the molecular weight of the dioctyl sebacate is 427.

[0008] In the above-mentioned lubricating oil with optimized molecular ratio, the polypropylene glycol is polypropylene glycol PPG-425 with a molecular weight of 410-450.

[0009] In the above-mentioned lubricating oil with optimized molecular ratio, the methoxy polyethylene glycol is methoxy polyethylene glycol MPEG-500, with a molecular weight of 470-530.

[0010] In the above-mentioned equimolecular optimized ratio lubricating oil, the rosin pentaerythritol ester is nano-grade rosin pentaerythritol ester with a molecular weight of 450.

[0011] In the above-mentioned equimolecular optimized ratio lubricant, the cholesterol octanoate is nano-scale cholesterol octanoate with a molecular weight of 513.

[0012] The above-mentioned equimolecular optimized ratio lubricant, wherein the lauric acid imidazoline is nano-scale lauric acid imidazoline with a molecular weight of 484.

[0013] In the above-mentioned equimolecular optimized ratio lubricating oil, the molecular weight of the sodium dioctyl sulfosuccinate is 445.

[0014] The above-mentioned equimolecular optimized ratio lubricating oil, wherein the trioctyl phosphite is 419.

[0015] A method for preparing an equimolecular optimized ratio lubricating oil comprises the following steps:

[0016] Step 1: Weigh trimethylolpropane octylcaprate, dioctyl sebacate, polypropylene glycol, methoxy polyethylene glycol, nano-grade pentaerythritol rosin ester, nano-grade cholesterol octanoate, nano-grade imidazoline laurate, sodium dioctyl sulfosuccinate, and trioctyl phosphite according to the ratio;

[0017] Step 2: Add trimethylolpropane octyl decanoate, dioctyl sebacate and polypropylene glycol into a sealed reaction kettle and heat and mix;

[0018] Step 3: After the mixing in step 2 is completed, methoxy polyethylene glycol, sodium dioctyl sulfosuccinate and trioctyl phosphite are added into a sealed reaction kettle and heated and mixed;

[0019] Step 4: After the mixing in step 3 is completed, the nano-sized rosin pentaerythritol ester, nano-sized cholesterol octanoate and nano-sized lauric acid imidazoline are added into a sealed reaction kettle and heated and mixed;

[0020] Step 5: After the mixing in step 4 is completed, stop heating and cool to room temperature and divide into packages to obtain the lubricating oil with equal molecular weight and optimized ratio.

[0021] In the above-mentioned method for preparing an equimolecular optimized ratio lubricant, the heating temperature in step 2 is 80-100° C. and the mixing time is 30-40 minutes.

[0022] In the above-mentioned method for preparing an equimolecular optimized ratio lubricant, the heating temperature in step 3 is 70-80° C. and the mixing time is 20-30 min.

[0023] In the above-mentioned method for preparing an equimolecular optimized ratio lubricant, the heating temperature in step 4 is 80-90° C. and the mixing time is 30-40 minutes.

[0024] The advantages of the present invention are as follows: the molecular weights of all substances in the present invention are between 400 and 600, thereby minimizing the difference in molecular weights of the substances, and enabling the substances to be evenly dispersed after mixing; and at the same time, the molecular weight range selected by the present invention belongs to a moderate region, which can ensure that the lubricating oil is not easily volatile and can be used stably for a long time, and the performance of the lubricating oil will not be affected by factors such as small or large molecular weight or large differences in molecular weights of different substances. Therefore, the lubricating oil can be used stably for a long time while ensuring its performance, thereby extending its service life. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] A lubricating oil with an optimized equimolecular ratio comprises the following substances in parts by weight: 30-50 parts of trimethylolpropane octylcaprate; 20-30 parts of dioctyl sebacate; 20-30 parts of polypropylene glycol; 10-20 parts of methoxy polyethylene glycol; 12-18 parts of rosin pentaerythritol ester; 5-7 parts of cholesterol octanoate; 3-5 parts of lauric acid imidazoline; 3-6 parts of sodium dioctyl sulfosuccinate; and 5-9 parts of trioctyl phosphite. The molecular weight of all the selected substances is between 400 and 600.

[0027] Preferably, the molecular weight of the trimethylolpropane octanedioate described in this embodiment is 451.

[0028] Preferably, the molecular weight of the dioctyl sebacate described in this embodiment is 427.

[0029] Preferably, the polypropylene glycol described in this embodiment is polypropylene glycol PPG-425, with a molecular weight of 410-450.

[0030] Preferably, the methoxy polyethylene glycol described in this embodiment is methoxy polyethylene glycol MPEG-500, with a molecular weight of 470-530.

[0031] Preferably, the rosin pentaerythritol ester described in this embodiment is nano-scale rosin pentaerythritol ester with a molecular weight of 450.

[0032] Preferably, the cholesterol octanoate described in this embodiment is nano-sized cholesterol octanoate with a molecular weight of 513.

[0033] Preferably, the lauric acid imidazoline described in this embodiment is nano-scale lauric acid imidazoline with a molecular weight of 484.

[0034] Preferably, the molecular weight of the sodium dioctyl sulfosuccinate described in this embodiment is 445.

[0035] Preferably, the trioctyl phosphite described in this embodiment is 419.

[0036] A method for preparing an equimolecular optimized ratio lubricating oil comprises the following steps:

[0037] Step 1: Weigh trimethylolpropane octylcaprate, dioctyl sebacate, polypropylene glycol, methoxy polyethylene glycol, nano-grade pentaerythritol rosin ester, nano-grade cholesterol octanoate, nano-grade imidazoline laurate, sodium dioctyl sulfosuccinate, and trioctyl phosphite according to the ratio;

[0038] Step 2: Add trimethylolpropane octyl decanoate, dioctyl sebacate and polypropylene glycol into a sealed reaction kettle and heat and mix;

[0039] Step 3: After the mixing in step 2 is completed, methoxy polyethylene glycol, sodium dioctyl sulfosuccinate and trioctyl phosphite are added into a sealed reaction kettle and heated and mixed;

[0040] Step 4: After the mixing in step 3 is completed, the nano-sized rosin pentaerythritol ester, nano-sized cholesterol octanoate and nano-sized lauric acid imidazoline are added into a sealed reaction kettle and heated and mixed;

[0041] Step 5: After the mixing in step 4 is completed, stop heating and cool to room temperature and divide into packages to obtain the lubricating oil with equal molecular weight and optimized ratio.

[0042] Preferably, the heating temperature in step 2 of this embodiment is 80-100° C., and the mixing time is 30-40 min.

[0043] Preferably, the heating temperature in step 3 of this embodiment is 70-80° C., and the mixing time is 20-30 min.

[0044] Preferably, the heating temperature in step 4 of this embodiment is 80-90° C., and the mixing time is 30-40 min.

[0045] Example 1

[0046] Step 1: According to the ratio, weigh 30 parts of trimethylolpropane octyl decanoate (molecular weight 451); 20 parts of dioctyl sebacate (molecular weight 427); 20 parts of polypropylene glycol PPG-425 (molecular weight 410-450); 10 parts of methoxy polyethylene glycol MPEG-500 (molecular weight 470-530); 12 parts of nano-grade rosin pentaerythritol ester (molecular weight 450); 5 parts of nano-grade cholesterol octanoate (molecular weight 513); 3 parts of nano-grade lauric acid imidazoline (molecular weight 484); 3-6 parts of sodium dioctyl sulfosuccinate (molecular weight 445); and 5 parts of trioctyl phosphite (molecular weight 419);

[0047] Step 2: Add trimethylolpropane octyl decanoate, dioctyl sebacate and polypropylene glycol PPG-425 into a sealed reactor and heat to 80°C and mix for 40 minutes;

[0048] Step 3: After the mixing in step 2 is completed, methoxy polyethylene glycol MPEG-500, sodium dioctyl sulfosuccinate and trioctyl phosphite are added into a sealed reaction kettle and heated to 70°C and mixed for 30 minutes;

[0049] Step 4: After the mixing in step 3 is completed, nano-sized rosin pentaerythritol ester, nano-sized cholesterol octanoate and nano-sized lauric acid imidazoline are added into a sealed reaction kettle and heated to 80° C. and mixed for 40 minutes;

[0050] Step 5: After the mixing in step 4 is completed, stop heating and cool to room temperature and divide into packages to obtain the lubricating oil with equal molecular weight and optimized ratio.

[0051] Example 2

[0052] Step 1: According to the ratio, weigh 50 parts of trimethylolpropane octyl decanoate (molecular weight 451); 30 parts of dioctyl sebacate (molecular weight 427); 30 parts of polypropylene glycol PPG-425 (molecular weight 410-450); 20 parts of methoxy polyethylene glycol MPEG-500 (molecular weight 470-530); 18 parts of nano-grade pentaerythritol rosin ester (molecular weight 450); 7 parts of nano-grade cholesterol octanoate (molecular weight 513); 5 parts of nano-grade lauric acid imidazoline (molecular weight 484); 6 parts of sodium dioctyl sulfosuccinate (molecular weight 445); and 9 parts of trioctyl phosphite (molecular weight 419);

[0053] Step 2: Add trimethylolpropane octyl decanoate, dioctyl sebacate and polypropylene glycol PPG-425 into a sealed reactor and heat to 100°C and mix for 30 minutes;

[0054] Step 3: After the mixing in step 2 is completed, methoxy polyethylene glycol MPEG-500, sodium dioctyl sulfosuccinate and trioctyl phosphite are added into a sealed reaction kettle and heated to 80°C and mixed for 20 minutes;

[0055] Step 4: After the mixing in step 3 is completed, nano-sized rosin pentaerythritol ester, nano-sized cholesterol octanoate and nano-sized lauric acid imidazoline are added into a sealed reaction kettle and heated to 90° C. and mixed for 30 minutes;

[0056] Step 5: After the mixing in step 4 is completed, stop heating and cool to room temperature and divide into packages to obtain the lubricating oil with equal molecular weight and optimized ratio.

[0057] Example 3

[0058] Step 1: According to the ratio, weigh 40 parts of trimethylolpropane octyl decanoate (molecular weight 451); 25 parts of dioctyl sebacate (molecular weight 427); 25 parts of polypropylene glycol PPG-425 (molecular weight 410-450); 15 parts of methoxy polyethylene glycol MPEG-500 (molecular weight 470-530); 15 parts of nano-grade pentaerythritol rosin ester (molecular weight 450); 6 parts of nano-grade cholesterol octanoate (molecular weight 513); 4 parts of nano-grade imidazoline laurate (molecular weight 484); 4.5 parts of sodium dioctyl sulfosuccinate (molecular weight 445); and 7 parts of trioctyl phosphite (molecular weight 419);

[0059] Step 2: Add trimethylolpropane octyl decanoate, dioctyl sebacate and polypropylene glycol PPG-425 into a sealed reactor and heat to 90°C and mix for 35 minutes;

[0060] Step 3: After the mixing in step 2 is completed, methoxy polyethylene glycol MPEG-500, sodium dioctyl sulfosuccinate and trioctyl phosphite are added into a sealed reaction kettle and heated to 75°C and mixed for 25 minutes;

[0061] Step 4: After the mixing in step 3 is completed, nano-sized rosin pentaerythritol ester, nano-sized cholesterol octanoate and nano-sized lauric acid imidazoline are added into a sealed reaction kettle and heated to 85° C. and mixed for 35 minutes;

[0062] Step 5: After the mixing in step 4 is completed, stop heating and cool to room temperature and divide into packages to obtain the lubricating oil with equal molecular weight and optimized ratio.

[0063] The lubricating oils prepared in Examples 1-3 of the present invention and an existing lubricant with relatively good performance (denoted as a control example) were tested for performance according to national standards GB / T12583-1998 (Determination of Extreme Pressure Properties of Lubricants) and GB / T265-2004 (Determination of Kinematic Viscosity and Calculation of Dynamic Viscosity of Petroleum Products). The test results are shown in Table 1.

[0064] Maximum negative bite (N) Wear spot diameter (mm) <![CDATA[Kinematic viscosity (100 °C) (mm 2 / s)]]> Example 1 856±2.913 0.342±0.134 11.31 Example 2 863±3.147 0.318±0.129 11.09 Example 3 868±3.049 0.298±0.132 10.86 Control Example 749±3.298 0.638±0.276 14.56

[0065] Table 1

[0066] As can be seen from the data in Table 1, the maximum negative bite and wear spot diameter of Examples 1-3 of the present invention are better than those of the control example, and the kinematic viscosity meets the relevant standards (9.3-12.5mm under 100°C conditions). 2 / s), so the lubricant prepared by the present invention has excellent performance, and it has been verified through actual use that it can be used stably for a long time during use, thereby ensuring the performance of the lubricating oil while also ensuring its long-term stable use.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An equimolecular optimized ratio lubricating oil, characterized by: The invention comprises the following substances in parts by weight: 30-50 parts of trimethylolpropane octylcaprate; 20-30 parts of dioctyl sebacate; 20-30 parts of polypropylene glycol; 10-20 parts of methoxy polyethylene glycol; 12-18 parts of rosin pentaerythritol ester; 5-7 parts of cholesterol octanoate; 3-5 parts of lauric acid imidazoline; 3-6 parts of sodium dioctyl sulfosuccinate; and 5-9 parts of trioctyl phosphite. The molecular weight of all the selected substances is 400-600.

2. The equimolecular optimized ratio lubricating oil according to claim 1, characterized in that: The molecular weight of the trimethylolpropane octanedioate is 451; The molecular weight of the dioctyl sebacate is 427; The polypropylene glycol is polypropylene glycol PPG-425, with a molecular weight of 410-450; The methoxy polyethylene glycol is methoxy polyethylene glycol MPEG-500, and the molecular weight is 470-530.

3. The equimolecular optimized ratio lubricating oil according to claim 1, characterized in that: The rosin pentaerythritol ester is nano-scale rosin pentaerythritol ester with a molecular weight of 450.

4. The equimolecular optimized ratio lubricating oil according to claim 1, characterized in that: The cholesterol octanoate is nano-scale cholesterol octanoate with a molecular weight of 513.

5. The equimolecular optimized ratio lubricating oil according to claim 1, characterized in that: The lauric acid imidazoline is nano-scale lauric acid imidazoline with a molecular weight of 484.

6. The equimolecular optimized ratio lubricating oil according to claim 1, characterized in that: The molecular weight of the sodium dioctyl sulfosuccinate is 445; The trioctyl phosphite is 419.

7. A method for preparing an equimolecular optimized ratio lubricating oil, characterized in that: The steps include: Step 1: Weigh trimethylolpropane octylcaprate, dioctyl sebacate, polypropylene glycol, methoxy polyethylene glycol, nano-grade pentaerythritol rosin ester, nano-grade cholesterol octanoate, nano-grade imidazoline laurate, sodium dioctyl sulfosuccinate, and trioctyl phosphite according to the ratio; Step 2: Add trimethylolpropane octyl decanoate, dioctyl sebacate and polypropylene glycol into a sealed reaction kettle and heat and mix; Step 3: After the mixing in step 2 is completed, methoxy polyethylene glycol, sodium dioctyl sulfosuccinate and trioctyl phosphite are added into a sealed reaction kettle and heated and mixed; Step 4: After the mixing in step 3 is completed, the nano-sized rosin pentaerythritol ester, nano-sized cholesterol octanoate and nano-sized lauric acid imidazoline are added into a sealed reaction kettle and heated and mixed; Step 5: After the mixing in step 4 is completed, stop heating and cool to room temperature and divide into packages to obtain the lubricating oil with equal molecular weight and optimized ratio.

8. The method for preparing an equimolecular optimized ratio lubricating oil according to claim 7, characterized in that: The heating temperature in the step 2 is 80-100° C., and the mixing time is 30-40 minutes.

9. The method for preparing an equimolecular optimized ratio lubricating oil according to claim 7, characterized in that: The heating temperature in step 3 is 70-80° C., and the mixing time is 20-30 min.

10. The method for preparing an equimolecular optimized ratio lubricating oil according to claim 7, characterized in that: The heating temperature in the step 4 is 80-90° C., and the mixing time is 30-40 min.