CN116376627A - A kind of ionic liquid lubricant prepared in situ in water and preparation method thereof - Google Patents

Abstract

The invention provides an ionic liquid lubricant prepared in situ in water and a preparation method thereof, wherein the method comprises the following steps: the aqueous solution of phytic acid and the compound containing the alcoholic hydroxyl group are stirred and reacted at normal temperature to obtain the compound. The raw material phytic acid used in the invention is extracted from plants, does not contain halogen, is not easy to decompose corrosive acid such as HF, does not contain S, reduces the corrosion to metals such as copper and the like, and has lower toxicity; in addition, because the phytic acid has strong acidity, the phytic acid can be stirred with the compound containing the alcoholic hydroxyl group at normal temperature and directly reacts to generate the ionic liquid, and the preparation method is simple and takes less time. The aqueous ionic liquid can be directly used as a lubricant without drying treatment, and has good corrosion resistance.

Description

A kind of ionic liquid lubricant prepared in situ in water and preparation method thereof

technical field

The invention relates to the technical field of materials, in particular to an ionic liquid lubricant prepared in situ in water and a preparation method thereof.

Background technique

Ionic liquids have the advantages of low volatility, high reactivity, strong surface adsorption capacity, and controllable structure and performance, and can be used as high-performance lubricants and lubricating additives.

However, traditional ionic liquids are halogen-containing ionic liquids, which are easily hydrolyzed to produce corrosive acids such as HF and HCl, and have high toxicity. Therefore, traditional ionic liquids are mainly used as lubricants for non-metallic materials such as ceramics. agent, thus limiting the application range of traditional ionic liquids.

Contents of the invention

The purpose of the present invention is to solve the shortcomings of traditional ionic liquids, such as high toxicity, poor hydrolytic stability and strong corrosion, and provide an ionic liquid lubricant prepared in situ in water and a preparation method thereof.

The invention discloses a method for preparing ionic liquid lubricant in situ in water, which is prepared by stirring and reacting phytic acid aqueous solution and a compound containing alcoholic hydroxyl group at normal temperature.

Further, the method for preparing ionic liquid lubricant in situ in water as described above, the compound containing alcoholic hydroxyl group includes: monoethanolamine, diethanolamine, triethanolamine, N,N-dimethylethanolamine, choline hydroxide one or more of.

Further, in the method for preparing an ionic liquid lubricant in situ in water as described above, the concentration of the phytic acid aqueous solution is 50%-90%.

An ionic liquid lubricant prepared by any one of the above methods.

Beneficial effect:

The raw material phytic acid used in the present invention is extracted from plants, it does not contain halogen, is not easy to decompose corrosive acid such as HF, does not contain S, reduces the corrosion to metals such as copper, and is less toxic; and, because phytic acid has very Strong acidity, it can be stirred at normal temperature with compounds containing alcoholic hydroxyl groups, and directly react to generate ionic liquids. The preparation method is simple and time-consuming. The water-containing ionic liquid can be directly used as a lubricant without drying treatment, and has better anti-corrosion properties.

In addition, the present invention can obtain lubricants containing ionic liquids with different tribological properties by adjusting the water content. The mechanism of action is that the anion and cation structures formed by the ionic liquid in water are adsorbed on the positively charged metal surface in the form of ion pairs. , so as to form a more compact and orderly adsorption film with an electric double layer structure. The adsorption film not only isolates water and air, but also improves the anti-corrosion performance of metals, and the regulation of moisture content can change the viscosity and shear of the adsorption film. performance, thereby controlling its friction performance as a lubricant. And during the friction process, the molecular active groups containing P element in the adsorption film can further tribochemically react with the metal to form a friction reaction film. The boundary lubricant film composed of the adsorption film and the friction reaction film has good shear and wear resistance. Therefore, the coefficient of friction and wear can be further reduced, and the lubricating performance of the lubricant can be effectively improved.

Description of drawings

Fig. 1 is the friction coefficient curve of the phytic acid ionic liquid of different water content;

Figure 2 is a graph showing the anticorrosion effects of different concentrations of phytic acid ionic liquids on cast iron.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention are clearly and completely described below. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1:

100.0g of 70wt% phytic acid aqueous solution and 149.2g of triethanolamine were stirred and reacted at room temperature for 2 hours to obtain a 10wt% phytic acid ionic liquid containing water. The following formula is the molecular structure of the ionic liquid prepared in this example.

Example 2:

100.0 g of 70 wt % phytic acid aqueous solution and 149.2 g of triethanolamine were stirred and reacted in 15.9 g of water at room temperature for 2 h to obtain 15 wt % phytic acid ionic liquid.

Example 3:

100.0 g of 70 wt % phytic acid aqueous solution and 149.2 g of triethanolamine were stirred and reacted in 35.0 g of water at room temperature for 2 h to obtain 20 wt % phytic acid ionic liquid.

Example 4:

100.0 g of 70 wt % phytic acid aqueous solution and 149.2 g of triethanolamine were stirred and reacted in 56.6 g of water at room temperature for 2 h to obtain 25 wt % phytic acid ionic liquid.

Example 5:

100.0 g of 70 wt % phytic acid aqueous solution and 149.2 g of triethanolamine were stirred and reacted in 81.4 g of water at room temperature for 2 hours to obtain 30 wt % phytic acid ionic liquid.

Embodiment 6:

100.0 g of 70 wt % phytic acid aqueous solution and 149.2 g of triethanolamine were stirred and reacted in 109.9 g of water at room temperature for 2 hours to obtain 35 wt % phytic acid ionic liquid.

Embodiment 7:

100.0 g of 70 wt % phytic acid aqueous solution and 149.2 g of triethanolamine were stirred and reacted in 143.2 g of water at room temperature for 2 hours to obtain 40 wt % phytic acid ionic liquid.

Embodiment 8:

100.0 g of 70 wt % phytic acid aqueous solution and 149.2 g of triethanolamine were stirred and reacted in 182.6 g of water at room temperature for 2 hours to obtain a water-containing 45 wt % phytic acid ionic liquid.

Experimental example 1:

Tribological performance test:

Using the SRV-IV fretting friction and wear testing machine of Optimol Grease Company in Germany, the friction coefficient was evaluated under the conditions of temperature 30°C, frequency 50Hz, amplitude 1mm, load 5N, and time 30min. The steel ball used in the test is GCr15 bearing steel with a diameter of 10mm. The block used for the lower sample is a GCr15 steel block with a diameter of 24mm and a height of 7.9±0.1mm. The wear volume of the wear marks on the steel block is measured by a non-contact 3D surface profiler. Figure 1 is the friction coefficient curves of phytic acid ionic liquids with different water contents, as shown in Figure 1, as can be seen from Figure 1, when the water content exceeds 25%, the higher the water content, the greater the friction coefficient, and the 25% containing The friction coefficient reaches the minimum value when the amount of water is high.

The results of average friction coefficient and wear volume are shown in Table 1, where the comparative example is water. It can be seen from Table 1 that the ionic liquids prepared in Examples 1-4 have good friction-reducing and anti-wear properties. However, as the water content increases, the viscosity decreases and the corresponding corrosion wear increases, and the anti-friction performance and anti-wear performance of the ionic liquid prepared in Examples 5-8 become worse.

Experimental example 2:

Anti-corrosion performance test:

This experimental example adopts the cast iron sheet corrosion in GB/T 6144-2010 to carry out the corrosion resistance test, as shown in Figure 2, the embodiment of the phytic acid ionic liquid prepared by the method of the present invention has a water content of 15%-45% to cast iron. Good anti-corrosion effect.

And, when the water content of phytic acid ionic liquid is between 10%～30%, SRV friction test result shows that 10%-30% water content embodiment has better anti-wear property and lower friction coefficient, exceeds 30% water content, the amount of wear increases sharply.

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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (4)

1. A method for preparing an ionic liquid lubricant in situ in water, characterized in that, the phytic acid aqueous solution and the compound containing alcoholic hydroxyl groups are stirred and reacted at normal temperature to prepare. 2. the method for preparing ionic liquid lubricant in situ in water according to claim 1, is characterized in that, described compound containing alcoholic hydroxyl group comprises: monoethanolamine, diethanolamine, triethanolamine, N,N-dimethylethanolamine , one or more of choline hydroxide. 3. The method for preparing an ionic liquid lubricant in situ in water according to claim 1, wherein the concentration of the phytic acid aqueous solution is 50%-90%. 4. An ionic liquid lubricant prepared by the method according to any one of claims 1-3.

Images