CN111234899A - Organic nano friction reducing agent and preparation method and application thereof - Google Patents

Abstract

The invention provides an organic nano friction reducer and a preparation method and application thereof, relating to the technical field of lubricating materials. The friction reducer provided by the invention is used for low-viscosity lubricating oil base oil, and has excellent dispersion stability and long-acting friction reduction property.

Description

A kind of organic nanometer wear reducing agent and its preparation method and application

technical field

The invention relates to the technical field of lubricating materials, in particular to a lubricating oil anti-friction agent.

Background technique

At present, the main research direction of lubricating oil energy-saving technology to improve fuel economy is to appropriately use low-viscosity oil containing high-performance friction reducer, because reducing the oil viscosity level in the state of fluid lubrication and elastic fluid lubrication can reduce the hydrodynamic resistance, Reduce energy consumption. In the state of boundary lubrication and mixed lubrication, adding high-efficiency friction reducer is the most effective way to reduce boundary friction loss.

With the continuous development of nanomaterials and nanotribology, in recent years, scholars at home and abroad have noticed the excellent antifriction properties of many nanomaterials in the process of developing excellent tribological performance additives, and the application of nanometer solid lubricating materials A series of studies have been carried out, for example, the addition of graphene, disulfide and other nanoparticles can significantly reduce the friction coefficient of oil (CN108587729A, CN108517239A, CN104531272A). Although nanomaterials have excellent tribological properties, due to their large surface energy and specific surface area, nanomaterials are in a state of energy instability and are prone to agglomeration and form precipitation in lubricating oils, especially in low-viscosity lubricating oils. Therefore, it cannot provide long-term effective friction reduction and control to achieve long-term energy saving of oil products, which largely limits the application of nanoparticles in engine lubricants in the future.

Aiming at the poor dispersion stability of nanometer antifriction additives in low-viscosity lubricating oil in the prior art, and the lack of long-term antifriction ability, the purpose of the present invention is to provide a novel organic nanometer lubricating oil antifriction additive suitable for low-viscosity oil products, It can be uniformly dispersed in low-viscosity lubricating oil for a long time and has a long-term anti-friction effect.

SUMMARY OF THE INVENTION

The invention provides an organic nano-friction reducing agent and a preparation method and application thereof, which solve the technical problems of poor dispersion stability and insufficient long-term friction reducing ability of the nano-friction reducing additive in low-viscosity lubricating oil in the prior art.

The present invention is achieved in this way: the friction reducing agent comprises a compound having the following molecular structure:

Here, R ₁ =R ₂ =n·C ₈ H ₁₇ .

The friction reducing agent is prepared by grafting reaction between nano-silica containing epoxy group and dioctyl dithiophosphoric acid.

A preparation method of an organic nano-friction reducing agent, comprising the following steps: placing nano-silicon dioxide containing an epoxy group in petroleum ether, magnetic stirring and dispersing, adding dioctyl dithiophosphoric acid into a dispersion system, The temperature was directly heated to 100°C, and the reaction was refluxed for 4 hours. After the reaction, the crude product was collected by filtration at room temperature, washed three times with absolute ethanol, and dried to obtain a friction reducing agent.

As a preferred embodiment, the mass ratio of the epoxy group-containing nano-silica to dioctyl dithiophosphoric acid is 1:3.

The application of the organic nano-wear reducing agent, as a lubricating oil additive, is added in an amount of 0.2wt.%-0.3wt.%.

As a preferred embodiment, the added amount of the friction reducing agent is 0.25 wt.%.

Beneficial effects of the present invention: the friction reducing agent obtained by the present invention is suitable for low viscosity lubricating oil base oil (≤10cSt@100°C), and has excellent dispersion stability and long-term friction reducing performance.

Description of drawings

³¹ P NMR spectrum of the product of Example 1 (Nano-DPP) in Figure 1;

Fig. 2 is the thermogravimetric comparison diagram of the product (Nano-DPP) of embodiment 1 and nano-silica (Nano-Si);

Figure 3 is a graph of the friction coefficient of the friction reducing agent obtained in Example 1 used for lubricating oil additives, in which PAO10 represents pure base oil; PAO10+JP represents that the mass fraction of JP in PAO10 is 0.25%, and JP is a commercial organic nanometer Wear reducing agent; PAO10+Nano-DDDP represents that the mass fraction of Nano-DDDP in PAO10 is 0.25%.

Detailed ways

Example 1

Disperse 5g of nano-silica containing epoxy groups (Henan Heda Nanomaterials Engineering Research Center, particle size 7-25nm, Nano-SiO ₂ ) in 30mL of petroleum ether (boiling point: 60-90°C) with magnetic stirring . Subsequently, 15g of dioctyldithiophosphoric acid (DDP) was added to the above dispersion system, the temperature was directly heated to 100°C, and the reaction was refluxed for 4h. After the reaction was completed, the crude product was collected by filtration at room temperature, and rinsed with absolute ethanol. Three times, the dosage of each time is 20 g, and the product of the present invention (Nano-DDP) is obtained after drying in an oven. Referring to Figure 1 and Figure 2, it can be judged that the obtained product is the target graft product by comparing the ³¹ P NMR spectrum of the product and the thermal weight loss test results comparing the invention product and nano-silica.

reaction process:

Here, R ₁ =R ₂ =n·C ₈ H ₁₇ .

The wear reducing agent is used as an additive of lubricating oil, and the addition amount is 0.2wt.%-0.3wt.%, the mass fraction, preferably the addition amount is 0.25wt.%.

Experimental example 1

The obtained Nano-DDP was added to a low-viscosity polyalphaolefin base oil (PAO10, 9.8cSt@100°C) at a concentration of 0.25 wt. Dispersion stability and anti-friction properties. The friction-reducing performance of the oil was investigated by fretting friction and wear tester (SRV). The lower the friction coefficient, the better the friction-reducing performance. Load: 50N, Time: 1800s, Amplitude: 1mm, Frequency: 50Hz, see Figure 3 for friction coefficient.

The test results show that the existence of JP and Nano-DDP can reduce the friction coefficient of base oil; the friction reducing effect of Nano-DDP is better than that of JP under the same amount of addition; when the test time is more than 100s, PAO10+ The friction coefficient of JP showed a rapid increase trend with the prolongation of time, indicating that the friction reduction of JP in oil products failed. Long-lasting anti-friction effect.

The Nano-DDP obtained in Example 1 was added to mineral oil, PAO10 and diester base oil according to the concentration of 0.25wt.%, mechanically stirred for 10min, and then ultrasonicated for 10min, and then evaluated its dispersion stability in oil. , see Table 1 for the results.

Table 1 Dispersion stability of organic nano-friction reducer in different types of base oils (room temperature), 0.25wt.%

Among them, mineral oil base oil was purchased from Daqing Refinery Company; diester base oil and PAO10 were purchased from ExxonMobil Company. It can be seen from Table 1 that the organic nano-wear reducing agent of the present invention has excellent dispersion stability in lubricating oil.

Experimental example 2

The Nano-DDP obtained in Example 1 was added to a low-viscosity polyalphaolefin base oil (PAO10, 9.8cSt@100°C) according to the concentrations of 0.20wt.% and 0.30wt.%, respectively, and mechanically stirred for 10min, and then ultrasonicated for 10min. Then evaluate its antifriction performance in base oil, load: 50N, time: 1800s, amplitude: 1mm, frequency: 50Hz, see Table 2 for the results.

Table 2 Effects of different concentrations of Nano-DDP on the antifriction performance of PAO10

It can be seen from Table 2 that when the addition amount of Nano-DDP in the base oil is 0.20wt.%, 0.25wt.%, and 0.30wt.%, the friction coefficients of the base oil are 0.071, 0.069, and 0.073, respectively, which are significantly lower than those without the addition of Nano-DDP. Friction coefficient of the base oil of the wear reducer.

The Nano-DDP obtained in Example 1 was added to mineral oil, PAO10 and diester base oil according to the concentration of 0.20wt.% and 0.30wt.%, mechanically stirred for 10min, and then ultrasonicated for 10min, and then evaluated its performance in oil. Dispersion stability in , see Table 3 for the results.

Table 3. Dispersion stability of Nano-DDP in different types of base oils (room temperature)

It can be seen from Table 3 that the Nano-DDP obtained in Example 1 has excellent stability in different base oils.

Beneficial effects of the present invention: the friction reducing agent obtained by the present invention is suitable for low viscosity lubricating oil base oil (≤10cSt@100°C), and has excellent dispersion stability and long-term friction reducing performance.

Claims (6)

1. organic nanometer wear reducing agent, is characterized in that, this wear reducing agent comprises the compound with following molecular structure:

Here, R ₁ =R ₂ =n·C ₈ H ₁₇ . 2. organic nanometer wear-reducing agent according to claim 1, is characterized in that, this wear-reducing agent is prepared by grafting reaction of nano-silica containing epoxy group and dioctyl dithiophosphoric acid. to make. 3. the preparation method of organic nanometer wear-reducing agent as claimed in claim 1, is characterized in that, comprises the steps: the nano-silicon dioxide containing epoxy group is placed in petroleum ether, magnetic stirring is dispersed, and dioctyl The base dithiophosphoric acid was added to the dispersion system, the temperature was directly heated to 100 °C, and the reaction was refluxed for 4 h. After the reaction, the crude product was collected by filtration at room temperature, rinsed three times with absolute ethanol, and dried to obtain a friction reducer. 4. the preparation method of organic nanometer wear-reducing agent according to claim 3, is characterized in that, the mass ratio of the described nano-silica containing epoxy group and dioctyl dithiophosphoric acid is 1:3 . 5 . The application of the organic nano-wear reducing agent according to claim 1 , wherein, as a lubricant oil additive, the addition amount is 0.1wt.%-0.3wt.%. 6 . 6 . The application according to claim 5 , wherein the addition amount of the friction reducing agent is 0.25 wt. %. 7 .

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