1. An anti-rust, anti-wear additive for polyether lubricating oils, characterized in that the additive has the formula (1):

2. a process for the preparation of an anti-rust and anti-wear additive according to claim 1, characterized in that it comprises the following steps:

(a) weighing bis (2-ethylhexyl) phosphate and a choline solution, slowly dripping the choline solution into the bis (2-ethylhexyl) phosphate solution, and stirring at room temperature to obtain bis (2-ethylhexyl) phosphate choline ammonium salt;

(b) weighing di (2-ethylhexyl) phosphate choline ammonium salt and dodecenyl succinic anhydride, adding into a flask, and stirring for reaction to obtain the antirust antiwear additive shown in the formula (1).

3. The method of preparing an anti-rust and anti-wear additive according to claim 2, wherein the molar ratio of di (2-ethylhexyl) phosphate to choline is 1: 1.

4. The method of preparing an anti-rust and anti-wear additive according to claim 2, wherein the molar ratio of di (2-ethylhexyl) phosphate choline ammonium salt to dodecenyl succinic anhydride is 1: 1.

5. The use of the rust-inhibiting, anti-wear additive according to claim 1, wherein the additive is added as a polyether lubricant in an amount of 0.25% to 2%.

6. The use of a rust-inhibiting, anti-wear additive according to claim 5 wherein the polyether lubricating oil is one of oil-soluble polyethers.

Technical Field

The polyether is a generic name for homo-or copolymers of ethylene oxide, propylene oxide, butylene oxide, which are synthetic lubricating oils belonging to group V basestocks. The polyether synthetic oil has unique structure of ether linkage and hydroxyl group, so that the polyether synthetic oil has excellent dispersing, emulsifying and lubricating performance, and the structure and performance of the polyether product may be regulated flexibly by means of the variable factor in the polyether molecule to meet different use requirements. The characteristics of the polyether open up a wide prospect for the practical application of the polyether, and the polyether is successfully applied to lubricants such as flame-retardant hydraulic oil, gear oil, air compressor oil, special chain oil, metal working fluid and the like.

Although the lubricity of polyether is superior to that of base oil such as mineral oil, poly-alpha-olefin and the like, the working condition is often harsh in the use process, and extreme pressure antiwear additive must be added to improve the antiwear performance. The polarity of the polyether is strong, and the general antiwear agents such as phosphate, thiophosphate and the like can not play a good antifriction and antiwear role in the polyether. In addition, the polyether has strong hydrophilic performance, so that an adsorption layer of the polyether on the metal surface is easily invaded by water, and thus, the polyether is easy to rust.

Disclosure of Invention

The invention aims to provide an ionic liquid antirust and antiwear additive for polyether lubricating oil, which solves the problem of poor antiwear performance of an additive applied to the polyether lubricating oil in the prior art and simultaneously solves the problem of poor antirust performance of the polyether lubricating oil.

The invention relates to an ionic liquid antirust and antiwear additive for polyether lubricating oil, which is characterized by having a structural formula shown in formula (1):

the preparation method of the rust-proof and wear-resistant additive is characterized by comprising the following steps:

(a) weighing bis (2-ethylhexyl) phosphate and a choline solution with a molar ratio of 1:1, slowly dripping the choline solution into the bis (2-ethylhexyl) phosphate solution, and stirring for 1h at room temperature to obtain bis (2-ethylhexyl) phosphate choline ammonium salt;

(b) weighing bis (2-ethylhexyl) phosphate choline ammonium salt and dodecenyl succinic anhydride with the molar ratio of 1:1, adding into a single-neck flask, and stirring and reacting for 2 hours at 80 ℃ to obtain the antirust and antiwear additive with the structure shown in the formula (1).

The application of the rust-proof and wear-resistant additive is characterized in that the additive is used as polyether lubricating oil, and the addition amount of the additive is 0.25-2%.

The polyether lubricating oil as described above is one of oil-soluble polyethers.

The invention has the technical characteristics and beneficial effects that:

the antirust and antiwear additive for polyether lubricating oil has excellent antiwear and antirust performance in polyether base oil, and the preparation method has the advantages of simple process, high product yield, good atom economy and no byproduct generation.

Description of the drawings:

FIG. 1 shows the results of rust performance tests on polyether base oil OSP 46 and additives of the present invention added at 0.25%, 1%, 2% respectively.

Fig. 2 is a graph showing the wear volume of a polyether base oil OSP 46 and oil samples with 0.25%, 1%, 2% TCP added, respectively, and 0.25%, 1%, 2% additives of the present invention added, respectively, after a rub test.

The specific implementation mode is as follows:

the invention will be further elucidated and described with reference to the drawings and specific embodiments.

Example 1

Firstly, 9.66g of di (2-ethylhexyl) phosphate is weighed and added into a single-neck flask, 7.89g of choline solution (with the concentration of 46%) is slowly dripped at room temperature, the dripping is finished within 10min, and the reaction is continued for 60 min. Thereafter, water was removed from the mixture by using a rotary evaporator to obtain 12.65g of di (2-ethylhexyl) phosphocholine ammonium salt in a yield of 99.2%.

4.26g of the product bis (2-ethylhexyl) phosphocholine ammonium salt and 2.66g of dodecenyl succinic anhydride are taken and added into a single-neck flask, and the mixture is stirred for 2 hours at 80 ℃ to obtain 6.92g of dark brown viscous product with the yield of 100 percent.

The present invention will be further described below with reference to test examples. The compositions of oil samples of the test examples and comparative examples are shown in Table 1, in which OSP 46 is a polyether base oil manufactured by BASF corporation and TCP is tricresyl phosphate, a conventional anti-wear additive.

TABLE 1 compositions of oil samples of test examples and comparative examples

Corrosion performance test

The test method comprises the following steps: the results of the rust properties test according to GB/T11143A method on test example 1, test example 2, test example 3 and comparative example 1 are shown in FIG. 1.

As can be seen from FIG. 1, the oil samples to which the additive of the present invention was added were all rust-free, while the blank oil sample OSP 46 was heavily rusted. The additive of the invention has good antirust performance.

Tribology Performance testing

The test examples and the comparative examples were subjected to tribological property tests, and the wear volumes were characterized and compared.

The test method comprises the following steps: the test equipment is an SRV-V fretting friction wear tester of Optimol grease company in Germany, and the test conditions are that the load is 200N, the temperature is 50 ℃, the frequency is 50Hz, the stroke is 1mm, and the time is 30 min. The steel ball used in the test is AISI 52100 bearing steel with the diameter of 10mm, and the steel block used in the lower sample is AISI 52100 bearing steel with the diameter of 24mm and the height of 7.9 +/-0.1 mm. And (3) performing wear loss characterization on the lower sample steel block subjected to the SRV test by using a MicroXAM 3D non-contact three-dimensional surface profiler, wherein the result is shown in figure 2.

Referring to fig. 2, the experimental results show that the sample incorporating the additive of the present invention has a significantly reduced wear volume compared to the base oil OSP 46; compared with the case that TCP with the same concentration is added, the abrasion volume of the experimental examples 1, 2 and 3 is much lower than that of the comparative examples 2, 3 and 4, and the additive has more excellent abrasion resistance.

The invention has the beneficial effects that: the antirust and antiwear additive for polyether lubricating oil has excellent antiwear and antirust performance in polyether base oil, and the preparation process is simple, high in product yield, high in atom economy and without side product.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.