Lubricant compositions comprising polymerizable acid graft polymers as corrosion inhibitors

Abstract

Embodiments of lubricant compositions that can include a lubricating oil and a corrosion inhibitor are disclosed, where the corrosion inhibitor can include a polymerizable acid graft polymer that can include from about 3.0% to about 35% by weight of an unsaturated graft acid and an alkylene oxide polymer backbone, the alkylene oxide polymer backbone has the formula: R ''--[(OCnH2n) z---OR '] a wherein each R' in the formula may be independently selected from the group consisting of a hydrogen atom, a hydrogen group, and an acyl group wherein each R'' in the formula may be independently selected from the group consisting of a hydrogen atom, a hydrogen group, an amine-containing group, and an acyl group wherein each "n" in the formula may independently have a value of 2 to 4, wherein each "Z" in the formula may independently have a value from 4 to about 1800, and wherein "a" may have a value from 1 to 4.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Application Serial No. 63 / 359,586, filed on July 8, 2022, which is hereby incorporated by reference in its entirety. Technical Field

[0003] Embodiments described herein relate generally to corrosion inhibition, and more particularly to lubricant compositions having corrosion inhibitors. Background Art

[0004] Acid copolymer resins (ACRs) can be used to produce packaging materials, building panels, and water pipes, among other things. As a result of this utility, there is a demand for ACRs throughout the world. ACR production typically involves the use of corrosive materials. Over time, these corrosive materials can corrode components of the ACR production unit, requiring replacement of these components. Replacement of these components can increase the cost of ACR production. Therefore, there is a need to improve the production of ACRs, and more specifically, to improve the protection of ACR production units from the effects of corrosion. Summary of the invention

[0005] Embodiments of the present disclosure meet this need by utilizing the polymerizable acid-grafted polymers of the present invention in lubricant compositions.

[0006] According to one or more embodiments of the present disclosure, a lubricant composition is provided. The lubricant composition comprises: an oil lubricant and a corrosion inhibitor, wherein the corrosion inhibitor comprises a polymerizable acid graft polymer, wherein the polymerizable acid graft polymer comprises about 3.0 wt % to about 35 wt % of an unsaturated grafted acid and an alkylene oxide polymer backbone, wherein the alkylene oxide polymer backbone has the following formula: wherein each R' is independently selected from the group consisting of: a hydrogen atom, a hydrogen radical, and an acyl group; wherein R" is independently selected from the group consisting of: a hydrogen atom, a hydrogen radical, an amine-containing group, and an acyl group; wherein each "n" independently has a value from 2 to 4; wherein each "Z" independently has a value from 4 to about 1800; and wherein "a" has a value from 1 to 4.

[0007] Additional features and advantages will be set forth in the following detailed description, and in part will become apparent to those skilled in the art from that description or may be learned by practicing the embodiments described herein, including the drawings, the following detailed description, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A reactor system according to one or more embodiments of the present disclosure is schematically depicted.

[0009] When describing Figure 1 While the simplified schematic illustration of FIG. 1 does not include many valves, temperature sensors, electronic controllers, etc. that may be used and are well known to those of ordinary skill in the art, it should be understood that these components are within the scope of the present disclosure.

[0010] Reference will now be made in greater detail to various embodiments, some of which are illustrated in the accompanying drawings. DETAILED DESCRIPTION

[0011] The specific embodiments of the application will now be described. However, the present disclosure can be implemented in different forms and should not be construed as being limited to the embodiments set forth in the present disclosure. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the subject matter to those skilled in the art.

[0012] The present disclosure relates to lubricant compositions. For example, and as described herein, the lubricant composition may include a lubricating oil and a corrosion inhibitor. The corrosion inhibitor may include a polymerizable acid graft polymer comprising about 3.0 wt % to about 35 wt % of an unsaturated grafted acid and an alkylene oxide polymer backbone. The alkylene oxide polymer backbone may have the formula:

[0013]

[0014] Each R' in the formula may be independently selected from the group consisting of: a hydrogen atom, a hydrogen radical, and an acyl group. Each R" in the formula may be independently selected from the group consisting of: a hydrogen atom, a hydrogen radical, an amine-containing group, and an acyl group. Each "n" in the formula may independently have a value of 2 to 4. Each "Z" in the formula may independently have a value of 4 to about 1800. In the formula, "a" may have a value of 1 to 4.

[0015] As used herein, the term "polymerizable acid graft polymer" refers to a segmented copolymer comprising a linear backbone polymer and randomly distributed branches of another acid polymer. The linear backbone polymer may be a poly(alkylene oxide) compound. The poly(alkylene oxide) compound may be produced by reacting an alkylene oxide or a mixture of alkylene oxides added sequentially or in combination with an alcohol. Such an alcohol may be a monohydric alcohol or a polyhydric alcohol and corresponds to the formula R"(OH) a , wherein R" is selected from the group consisting of a hydrogen atom, a hydrogen radical, an amine-containing group, and an acyl group, and "a" has a value of 1 to 4. Such alcohols may include methanol, ethanol, propanol, butanol, ethylene glycol, glycerol, monoethyl ether of glycerol, dimethyl ether of glycerol, sorbitol, 1,2,6-hexanetriol, trimethylolpropane, and other alcohols having the corresponding formula are contemplated herein. Grafting the polymerizable acid monomer onto the poly(oxyalkylene) compound to form the polymerizable acid graft polymer can be carried out by free radical polymerization.

[0016] In one or more embodiments, the lubricant composition may include an oil lubricant. The oil lubricant may include at least one oil, and may contain one or more additives, for example, one or more lubricants. Additives may be added to improve lubricity, fluidity, thermal stability and / or other characteristics. In one or more embodiments, at least one oil may be a viscous liquid having a viscosity that is improved compared to water at the same temperature and pressure, and it is derived from petroleum. At least one oil may provide lubrication and reduce friction between the moving surfaces of a rotating mechanism and / or a reciprocating mechanism. In one or more embodiments, the oil may be one or more mineral oils and polyalkylene glycol base oils.

[0017] In some embodiments, the oil may have a 50 mm 2 / s to 200mm 2 / s kinematic viscosity. For example, oil may have a kinematic viscosity of 50 mm 2 / s to 100mm 2 / s、100mm 2 / s to 150mm 2 / s、150m 2 / s to 200mm 2 / s or any combination of these ranges.

[0018] As described herein, in one or more embodiments, the lubricant composition may include a corrosion inhibitor. In some embodiments, the lubricant composition may include a corrosion inhibitor in an amount of 0.5 wt % to about 20 wt %. For example, the lubricant composition may include a corrosion inhibitor in an amount of 0.5 wt % to 1 wt %, 1 wt % to 5 wt %, 5 wt % to 10 wt %, 10 wt % to 15 wt %, 15 wt % to 20 wt %, or any combination of these ranges. In some embodiments, the lubricant composition may include a corrosion inhibitor in an amount of 1 wt % to 17.5 wt %, 1.5 wt % to 15 wt %, 2 wt % to 12.5 wt %, or 2.5 wt % to 10 wt %. In some embodiments, the lubricant composition may include a polymerizable acid graft polymer as described herein in an amount of 2.5 wt % to 10 wt %.

[0019] In one or more embodiments, the corrosion inhibitor may comprise the polymerizable acid grafted polymer described above. As described above, the alkylene oxide polymer backbone may have the formula:

[0020]

[0021] Each R' may be independently selected from the group consisting of: a hydrogen atom, a hydrogen radical, and an acyl group. R" may be independently selected from the group consisting of: a hydrogen atom, a hydrogen radical, an amine-containing group, and an acyl group. Each "n" may independently have a value of 2 to 4. Each "Z" may independently have a value of about 4 to about 1800. In this formula, "a" may have a value of 1 to 4. In some embodiments, the lubricant composition may include a corrosion inhibitor wherein R' and R" are not both hydrogen atoms. In one or more embodiments, "n" is 2 or 3, "a" has a value of 1, and R' and R" are selected from the group consisting of: a hydrogen atom, a hydrogen radical, and an acyl group. In one embodiment, the alkylene oxide polymer backbone is an ethylene oxide ("EO") polymer or a propylene oxide ("PO") polymer.

[0022] In another embodiment, the corrosion inhibitor may comprise an alkylene oxide polymer backbone selected from the group consisting of ethylene oxide ("EO") and propylene oxide ("PO").

[0023] In one or more embodiments, the alkylene oxide polymer backbone is a copolymer of EO and PO polymers having a weight ratio of EO:PO of about 0:100 to about 100:0. For example, the alkylene oxide polymer backbone is a copolymer of EO and PO polymers having a weight ratio of EO:PO of about 0:100, about 10:90, about 20:80, about 30:70, about 40:60, about 50:50, about 60:40, about 70:30, about 80:20, about 90:10, or about 100:0. In some embodiments, the alkylene oxide polymer backbone is a copolymer of EO and PO polymers having a weight ratio of EO:PO of about 90:10 to about 10:90 or about 75:25 to about 25:75.

[0024] In one or more embodiments, the polymerizable acid grafted polymer may have an average molecular weight of about 1500 Daltons to about 80,000 Daltons. For example, the polymerizable acid grafted polymer may have an average molecular weight of about 1500 Daltons to about 5000 Daltons, about 5000 Daltons to about 10,000 Daltons, about 10,000 Daltons to about 20,000 Daltons, about 20,000 Daltons to about 30,000 Daltons, about 30,000 Daltons to about 40,000 Daltons, about 40,000 Daltons to about 50,000 Daltons, about 50,000 Daltons to about 60,000 Daltons, about 60,000 Daltons to about 70,000 Daltons, about 70,000 Daltons to about 80,000 Daltons, or any combination of these ranges. In some embodiments, the polymerizable acid grafted polymer may have an average weight of about 1500 Daltons to about 20,000 Daltons.

[0025] As disclosed herein, in one or more embodiments, the polymerizable acid-grafted polymer may include about 3.0 wt % to about 35 wt % of unsaturated grafted acid. For example, the polymerizable acid-grafted polymer may account for about 3.0 wt % to about 5.0 wt %, about 5.0 wt % to about 10 wt %, about 10 wt % to about 15 wt %, about 15 wt % to about 20 wt %, about 20 wt % to about 25 wt %, about 25 wt % to about 30 wt %, about 30 wt % to about 35 wt %, or any combination of these ranges. In some embodiments, the polymerizable acid-grafted polymer may account for about 4.0 wt % to about 30 wt %, or about 5.0 wt % to about 25 wt %. Without being bound by theory, it is surprisingly found that this grafting level is associated with improved corrosion resistance, as further described below.

[0026] In one or more embodiments, the unsaturated grafted acid can be selected from one or more of the following: acrylic acid, methacrylic acid, itaconic acid, maleic acid, 2-acrylamido-2-methylpropyl sulfonic acid (AMPS), 2-methacrylamido-2-methylpropyl sulfonic acid, styrene sulfonic acid, vinyl sulfonic acid, ethylene glycol methacrylate phosphate, vinyl phosphonic acid, and mixtures thereof.

[0027] In one or more embodiments, the corrosion inhibitor may comprise a polymerizable acid grafted polymer wherein the grafted acid is acrylic acid and the alkylene oxide polymer backbone is poly(ethylene oxide-propylene oxide) having a 50:50 weight ratio of ethylene oxide to propylene oxide.

[0028] In one or more embodiments, the corrosion inhibitor can be an acrylic grafted ethylene oxide-propylene oxide copolymer. For example, the corrosion inhibitor can be UCON from Dow TMEPML-483.

[0029] In one or more embodiments, the lubricant composition can be used in a method for reducing corrosion, the method comprising exposing a metal component to a solution containing the lubricant composition and (meth)acrylic acid, wherein the lubricant composition reduces metal corrosion. As used in this disclosure, the term "(meth)acrylic acid" may be used to refer to methacrylic acid or acrylic acid or both.

[0030] In one or more embodiments, the solution containing the lubricant composition may include a co-solvent. The co-solvent may include a carboxylic acid, an alcohol, or a combination thereof. In some embodiments, the co-solvent may include methanol.

[0031] As described above, the lubricant composition can be used to resist corrosion of metal components. In one or more embodiments, the metal components may include bronze packing rings. In one or more embodiments, the bronze packing rings may be part of a compressor. In some embodiments, the bronze packing rings may be used in high pressure polymerization reactors such as Figure 1 Part of a compressor unit utilized in a high pressure polymerization reactor (schematically depicted in FIG. ).

[0032] In one or more embodiments, the lubricant composition can be used in a free radical polymerization process comprising polymerizing ethylene monomer and optionally (meth)acrylic acid via free radical polymerization in a high pressure polyethylene reactor having a compressor with bronze packing rings in the presence of the lubricant composition. Free radical polymerization processes for producing ethylene-based polymers are typically conducted at elevated pressures (typically at least 100 MPa). For example, the free radical polymerization process can be conducted at least 200 MPa, at least 300 MPa, at least 400 MPa, or at least 500 MPa.

[0033] The following definitions may aid in understanding the operation of example reactor systems that may be suitable for use with the lubricant compositions described herein.

[0034] As used herein, the term "feed" or "feed stream" refers to fresh and / or recycled reactants added to a reaction zone at the inlet of the reaction zone.

[0035] As used herein, the term "reaction zone" refers to the zone of the reactor where polymerization is initiated or reinitiated by adding free radicals and / or decomposing components into free radicals and / or components that generate free radicals.

[0036] As used herein, the term "reactor system" refers to a component (device) for polymerizing and separating polymers. Such components / devices include, but are not limited to, one or more reactors, ultra-high pressure compressors, main compressors, and booster compressors. The reactor system typically includes at least one reactor, such as a tubular reactor, an autoclave reactor, or any combination thereof.

[0037] As used herein, the term "injection point" refers to the entry location of a device (used in a polymerization process) where a feed stream is added to the device.

[0038] As used herein, the term "pressurizing" refers to increasing the pressure of a liquid or feed to a higher pressure level.

[0039] As used herein, the term "compression system" refers to a compression device that increases the pressure of a vapor (e.g., ethylene vapor below or above its critical point) to a higher pressure level. Feeding comonomers may include pressurizing the reactive comonomers using an ultra-high pressure reciprocating piston pump and feeding the reactive comonomers directly into the feed stream of the reactor zone and / or the reaction zone, and / or feeding the comonomers by a combination of pressurizing with a high pressure pump and further compressing with a reciprocating piston compressor (e.g., an ultra-high pressure compressor, a main compressor, and / or a booster compressor).

[0040] As used herein, the term "compression" refers to increasing the pressure of a vapor (eg, ethylene vapor below or above its critical point) to a higher pressure level.

[0041] A booster compressor is a device that compresses the low pressure recycle, e.g. from a low pressure separator, to the required pressure level at the inlet side of the main compressor. This compression can be performed in one or more compression stages and can be combined with intercooling. A booster compressor can consist of a single or multiple compressor frames and can potentially be combined with a main compressor frame.

[0042] The main compressor is a device that compresses, for example: a) fresh incoming ethylene, and / or b) low pressure recycle from a booster compressor; each to the required pressure level on the inlet side of the hypercompressor. This compression can be performed in one or more compression stages and can be combined with intercooling. The main compressor can consist of a single or multiple compressor frames and can potentially be combined with a booster compressor frame.

[0043] A super high pressure compressor or secondary compressor is a device that compresses, for example, monomers from a primary compressor to the pressure level required for feeding to a reactor at its inlet pressure set point. This compression can be performed in one or more compression stages and can be combined with intermediate cooling. A super high pressure compressor typically comprises a plunger reciprocating compressor and can consist of a single or multiple compressor frames.

[0044] Reference now Figure 1 , schematically depicts an example reactor system that may be suitable for use with the lubricant compositions described herein. It should be understood that not Figure 1 All parts of the appended claims should be interpreted as being essential to the claimed subject matter. In addition, although the lubricant composition in the appended claims is Figure 1 Although described in the context of the present invention, such listed compositions should be understood to be applicable to other systems, as understood by those skilled in the art.

[0045] Figure 1 A general flow diagram of a high pressure polymerization process is shown, wherein the reactor system contains a reactor 26, which can be a tubular reactor, an autoclave reactor, or a combination of a tubular reactor and an autoclave reactor. Stream (1) represents fresh monomer supplement, which is compressed into stream (2) by a main compressor (22) together with the outlet of a booster compressor (20). The fresh monomer supplement may contain ethylene. Stream (2) is combined with a high pressure recycle stream (7) from a high pressure separator (28) in an ultra-high pressure compressor inlet stream (3) and fed to the suction port of an ultra-high pressure compressor (24). The ultra-high pressure compressor compresses the monomer feed stream to a level sufficient to feed to a reactor (26). Stream 4 represents a compressed monomer feed stream fed to a reactor (26). The high pressure separator (28) separates the product vapor (5) into a polymer-rich stream (6) and a stream (7) rich in unreacted monomers. Stream (7) is recycled for reuse in the process and stream (6) is sent to a low pressure separator (30). The low pressure separator (30) separates the vapor (6) into a monomer stream (8) which flows to a booster compressor (20) and a polymer stream (9) for further processing.

[0046] In one or more embodiments, the lubricant composition as described herein can be utilized in an ultra-high pressure compressor (UHP). For example, the lubricant composition can be exposed to metal components of an ultra-high pressure compressor (UHP). In some embodiments, the metal components of the ultra-high pressure compressor (UHP) can include bronze packing rings.

[0047] Test Method

[0048] Corrosion testing

[0049] The use density is 8.8g / cm 3The 936 bronze sample was subjected to corrosion testing at 20°C. The bronze sample was cut into a diameter of 1.27 cm and a thickness of 0.32 cm. The test was carried out in a glove box, and the reagents were degassed and dried if necessary and then placed in the glove box. All experiments were repeated 5 times and the average value was recorded. The pre-measured sample was added to a 40ml vial with a decompression cap. The reagent was then added to the vial and the decompression cap was fixed. The vial was then taken out of the glove box and a photo of the vial was taken. The vial was then placed in a heating block and heated at 100°C for 2 weeks. After 2 weeks, the vial was removed from the heating block and allowed to cool. When the vial had cooled to room temperature, tweezers were used to remove the sample from the vial and place it on a chemical wipe. The sample was rinsed on a metal pan with tetradecane and completely wiped off with a metal scraper. The flat end of the scraper was used at an angle of about 30° to scrape off any corrosion or accumulation on the surface of the sample. Be careful not to apply maximum pressure to the sample during scraping to avoid scratching the surface of the sample. Rinse the sample with clean tetradecane and wipe the sample with a chemical wipe. Place each of the cleaned samples in a separate 20 ml vial. Place the vials containing the cleaned samples in a vacuum oven at 160°C overnight to dry. Then weigh the dried sample. Measure and record the difference between the dried sample weight and the starting sample weight.

[0050] Corrosion rate

[0051] The corrosion rate was measured using the following formula: where weight loss is the difference between the dry sample weight and the starting sample weight, and the alloy density is 8.8 g / cm 3 , the exposed area of ​​the specimen is measured by treating the specimen as a cylinder and the exposed area is calculated as the exposed area of ​​the cylinder. 2 The exposure area is 1.27 cm, the specimen has a diameter of 0.32 cm and a thickness of 336 hours, the exposure time is 336 hours, and K is the K factor. The alloy density and K factor values ​​were collected from the literature.

[0052]

[0053] Corrosion Inhibition

[0054] Corrosion inhibition was measured to calculate the percent corrosion inhibition using the following formula: Uninhibited corrosion rate was calculated from the corrosion rate of the sample without the inhibitor present. Inhibited corrosion rate was calculated from the corrosion rate of the sample with the inhibitor added.

[0055]

[0056] Example

[0057] The embodiments will be further illustrated by the following examples.

[0058] Table 1 - Materials added for corrosion inhibition testing

[0059]

[0060] Table 1 shows the composition of the lubricant composition tested for its corrosion inhibition performance. Corrosion inhibitor testing was performed using a formulation having a lubricating oil, methanol, methacrylic acid and an optional corrosion inhibitor. The formulation components were mixed at room temperature. The lubricating oil used was Hydrobrite 380, which is a common white mineral oil produced by Sonneborn. The inhibitor used was UCON TM EPML 483 (which is an acrylic acid grafted ethylene oxide-propylene oxide copolymer) and UCON TM 50-HB-5100 (which is a non-grafted ethylene oxide-propylene oxide copolymer). UCON TM EPML 483 and UCON TM 50-HB-5100 are all commercially available from Dow Inc., Midland, MI. The amount of inhibitor added in each experiment was calculated as a weight percent of the Hydrobrite 380 lubricant.

[0061] Table 2 - Corrosion test results

[0062]

[0063] Table 3 - Corrosion Inhibition Percentage

[0064] Experiment number experiment Corrosion rate mil / year (mpy) Corrosion inhibition % A No inhibitors 12.25 0 2 Inhibitor: 2.5% EPML 483 1.72 85.9 3 Inhibitor: 5% EPML 483 1.35 88.9 4 Inhibitor: 10% EPML 483 1.18 90.4 B Inhibitor: 5% 50-NB-5100 12.15 0.8

[0065] Referring to the corrosion inhibition results in Tables 2 and 3, the experiments using EPML 483 (i.e., Experiments 2-4) showed significantly less corrosion than the comparative examples (such as Comparative Examples A and B) that did not use EPML 483. In addition, Tables 2 and 3 show that corrosion inhibition increases with increasing amounts of EPML 483 up to 10%. In short, Tables 2 and 3 show that EPML 483 exhibits excellent corrosion inhibition against methanol and methacrylic acid when combined with lubricating oils. Further, Tables 2 and 3 show that the addition of non-grafted ethylene oxide-propylene oxide copolymers (such as in Comparative Example B) has no significant effect on the corrosion inhibition performance of the lubricant composition. This indicates that acid grafting of ethylene oxide-propylene oxide copolymers improves the corrosion inhibition properties of the copolymers.

[0066] In a first aspect of the present disclosure, a lubricant composition may include an oil lubricant and a corrosion inhibitor comprising a polymerizable acid grafted polymer comprising from about 3.0 wt % to about 35 wt % of an unsaturated grafted acid and an alkylene oxide polymer backbone having the formula: wherein each R' is independently selected from the group consisting of a hydrogen atom, a hydrogen radical, and an acyl group, each R' is independently selected from the group consisting of a hydrogen atom, a hydrogen radical, an amine-containing group, and an acyl group, each "n" independently has a value from 2 to 4, each "Z" independently has a value from 4 to about 1800, and wherein "a" has a value from 1 to 4.

[0067] A second aspect of the present disclosure may include the first aspect, wherein R' and R" are not both hydrogen atoms.

[0068] A third aspect of the present disclosure may include any of the preceding aspects, wherein the grafted acid is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, 2-acrylamido-2-methylpropyl sulfonic acid (AMPS), 2-methacrylamido-2-methylpropyl sulfonic acid, styrene sulfonic acid, vinyl sulfonic acid, ethylene glycol methacrylate phosphate, vinyl phosphonic acid, and mixtures thereof.

[0069] A fourth aspect of the present disclosure may include any of the preceding aspects, wherein "n" = 2 or 3, wherein "a" has a value of 1, wherein each R' or R" is independently selected from the group consisting of: a hydrogen atom, a hydrogen radical, and an acyl radical, and wherein the alkylene oxide polymer backbone is an ethylene oxide ("EO") or propylene oxide ("PO") polymer.

[0070] A fifth aspect of the present disclosure may include any of the preceding aspects, wherein the alkylene oxide polymer backbone is selected from the group consisting of ethylene oxide ("EO") and propylene oxide ("PO").

[0071] A sixth aspect of the present disclosure may include any of the preceding aspects, wherein the alkylene oxide polymer backbone is a copolymer of EO and PO polymers having a weight ratio of EO:PO of about 0:100 to about 100:0, or about 90:10 to about 10:90 EO:PO, or about 75:25 to about 25:75 EO:PO.

[0072] A seventh aspect of the present disclosure may include any of the preceding aspects, wherein the polymer has an average molecular weight between about 1500 Daltons and about 80000 Daltons.

[0073] An eighth aspect of the present disclosure may include any of the preceding aspects, wherein the grafted acid is acrylic acid (10 wt%) and the alkylene oxide polymer backbone is poly(ethylene oxide-propylene oxide) having a 50:50 weight ratio of ethylene oxide ("EO") to propylene oxide ("PO").

[0074] A ninth aspect of the present disclosure may include any of the preceding aspects, wherein the oil lubricant comprises mineral oil.

[0075] A tenth aspect of the present disclosure may include any of the preceding aspects, wherein the lubricant composition comprises 0.5 wt % to 20 wt % of the corrosion inhibitor or 2.5 wt % to 10 wt % of the corrosion inhibitor.

[0076] An eleventh aspect of the present disclosure may include a method for reducing corrosion, the method comprising exposing a metal component to a solution comprising the lubricant composition according to any of the previous aspects and (meth)acrylic acid, wherein the lubricant composition reduces metal corrosion.

[0077] A twelfth aspect of the present disclosure may include the eleventh aspect, wherein the solution may include a co-solvent.

[0078] A thirteenth aspect of the present disclosure may include the twelfth aspect, wherein the co-solvent comprises a carboxylic acid, an alcohol, or a combination thereof.

[0079] A fourteenth aspect of the present disclosure may include the thirteenth aspect, wherein the alcohol comprises methanol.

[0080] A fifteenth aspect of the present disclosure may include the twelfth to fourteenth aspects, wherein the metal component includes a bronze packing ring.

[0081] A sixteenth aspect of the present disclosure may include the fifteenth aspect, wherein the bronze packing ring is part of a compressor.

[0082] A seventeenth aspect of the present disclosure may include the sixteenth aspect, wherein the bronze packing ring is part of a compressor unit utilized in a high pressure polyethylene reactor.

[0083] An eighteenth aspect of the present disclosure may include a free radical polymerization method, comprising polymerizing ethylene monomer and an optional (meth)acrylic acid comonomer via free radical polymerization in a high pressure polyethylene reactor having a compressor with bronze packing rings in the presence of the lubricant composition according to any one of the first to eleventh aspects.

[0084] It will be apparent to those skilled in the art that various modifications and changes may be made without departing from the scope disclosed herein. Since modifications, combinations, sub-combinations, and changes of the disclosed embodiments incorporating the spirit and substance disclosed herein may be made by those skilled in the art, the scope disclosed herein should be interpreted as including all matters within the scope of the appended claims and their equivalents.

[0085] For the purpose of defining the present invention, the transition phrase "consisting of" may be introduced in the claims as a closed preamble term that limits the scope of the claim to the listed components or steps and any naturally occurring impurities. For the purpose of defining the present invention, the transition phrase "consisting essentially of" may be introduced in the claims to limit the scope of one or more claim items to the stated elements, components, materials or method steps and any non-stated elements, components, materials or method steps that do not substantially affect the novel characteristics of the claimed subject matter. The transition phrases "consisting of" and "consisting essentially of" may be interpreted as open transition phrases, such as a subset of "comprising" and "including", so that any use of open phrases used to introduce a statement of a series of elements, components, materials or steps should be interpreted as also disclosing the statement of the series of elements, components, materials or steps using the closed terms "consisting of" and "consisting essentially of". For example, a statement of a composition "comprising" components A, B and C should be interpreted as also disclosing a composition "consisting of" components A, B and C and a composition "consisting essentially of" components A, B and C. Any quantitative values ​​expressed in this application may be deemed to include open embodiments conforming to the transitional phrases "comprising" or "including" as well as closed or partially closed embodiments conforming to the transitional phrases "consisting of" and "consisting essentially of.

[0086] As used in the specification and the appended claims, the singular forms "a", "an", and "the" include plural references unless the context clearly indicates otherwise. The verb "comprise" and its cognate forms should be interpreted as referring to elements, components, or steps in a non-exclusive manner. The referenced elements, components, or steps may exist, be utilized, or be combined with other elements, components, or steps that are not explicitly referenced.

[0087] It should be understood that any two quantitative values ​​assigned to a characteristic may constitute a range for that characteristic, and all combinations of ranges formed by all said quantitative values ​​of a given characteristic are considered in the present disclosure. The subject matter described herein has been described in detail and by reference to specific embodiments. It should be understood that any detailed description of a component or feature of an embodiment does not necessarily imply that the component or feature is necessary for a specific embodiment or any other embodiment. Further, it will be apparent to those skilled in the art that various modifications and changes may be made to the described embodiments without departing from the essence and scope of the claimed subject matter.

Claims

1. A lubricant composition, comprising: Oil lubricants and A corrosion inhibitor comprising a polymerizable acid grafted polymer comprising from about 3.0% to about 35% by weight of an unsaturated grafted acid and an alkylene oxide polymer backbone having the formula: wherein each R' is independently selected from the group consisting of a hydrogen atom, a hydrogen radical, and an acyl radical; wherein R" is independently selected from the group consisting of a hydrogen atom, a hydrogen radical, an amine-containing group, and an acyl group; wherein each value of "n" is independently 2 to 4; wherein each "Z" has a value independently ranging from 4 to about 1800; and The value of "a" is 1 to 4.

2. The lubricant composition according to claim 1, wherein R' and R" are not both hydrogen atoms.

3. The lubricant composition according to any preceding claim, wherein the grafted acid is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, 2-acrylamido-2-methylpropyl sulfonic acid (AMPS), 2-methacrylamido-2-methylpropyl sulfonic acid, styrene sulfonic acid, vinyl sulfonic acid, ethylene glycol methacrylate phosphate, vinyl phosphonic acid, and mixtures thereof.

4. A lubricant composition according to any preceding claim, wherein "n" = 2 or 3; The value of "a" is 1; wherein each R' or R" is independently selected from the group consisting of a hydrogen atom, a hydrogen radical, and an acyl group; and Wherein the alkylene oxide polymer backbone is an ethylene oxide ("EO") or propylene oxide ("PO") polymer.

5. The lubricant composition of any preceding claim, wherein the alkylene oxide polymer backbone is selected from the group consisting of ethylene oxide ("EO") and propylene oxide ("PO").

6. A lubricant composition according to any preceding claim, wherein the alkylene oxide polymer backbone is a copolymer of EO and PO polymers having a weight ratio of EO:PO of from about 0:100 to about 100:0, or from about 90:10 to about 10:90 EO:PO, or from about 75:25 to about 25:75 EO:PO.

7. The lubricant composition of any preceding claim, wherein the polymer has an average molecular weight of between about 1500 Daltons and about 80,000 Daltons.

8. A lubricant composition according to any preceding claim, wherein the grafted acid is acrylic acid (10 wt%) and the alkylene oxide polymer backbone is poly(ethylene oxide-propylene oxide) having a 50:50 weight ratio of ethylene oxide ("EO") to propylene oxide ("PO").

9. A lubricant composition according to any preceding claim, wherein the oil lubricant comprises mineral oil.

10. A lubricant composition according to any preceding claim, wherein the lubricant composition comprises 0.5 wt% to 20 wt% corrosion inhibitor or 2.5 wt% to 10 wt% corrosion inhibitor.

11. A method for reducing corrosion, the method comprising: Exposing a metal component to a solution comprising a lubricant composition according to any preceding claim and (meth)acrylic acid, wherein the lubricant composition reduces metal corrosion.

12. The method of claim 11, wherein the solution can contain a co-solvent.

13. The method of claim 12, wherein the co-solvent comprises a carboxylic acid, an alcohol, or a combination thereof.

14. The method of claim 13, wherein the alcohol comprises methanol.

15. A method according to any one of claims 12 to 14, wherein the metal component comprises a bronze packing ring.

16. The method of claim 15, wherein the bronze packing ring is part of a compressor.

17. The method of claim 16, wherein the bronze packing rings are part of a compressor unit utilized in a high pressure polyethylene reactor.

18. A free radical polymerization method, comprising: Ethylene monomer and optional (meth)acrylic acid comonomer are polymerized via free radical polymerization in a high pressure polyethylene reactor having a compressor with bronze packing rings in the presence of a lubricant composition according to any one of claims 1 to 11.

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