Lubricant composition for suppressing plugging and method for suppressing plugging using the same

Abstract

To provide a plugging-suppressing lubricant composition and a plugging-suppressing method using the same.SOLUTION: The present invention relates to the plugging-suppressing lubricant composition comprising any one selected from a base oil and a fatty acid and an emulsifier, and forming a single phase even when a carboxylic acid-based monomer flows into the base oil, and the lubricant composition suppresses plugging that occurs in a process of producing a copolymer derived from a carboxylic acid-based monomer. The present invention also relates to providing a plugging-suppression method using the plugging-suppressing lubricant composition.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lubricating composition for suppressing plugging and a method for suppressing plugging using the same.

Background Art

[0002] Ethylene-carboxylic acid copolymers such as ethylene-acrylic acid copolymers are utilized in various applications such as sealing materials, adhesives, packing materials, and optical films, and are industrially implemented on a wide scale.

[0003] Such ethylene-carboxylic acid copolymers can be produced by polymerizing carboxylic acid-based compounds such as acrylic acid and methacrylic acid as ethylene and comonomers in a continuous reactor. However, carboxylic acid-based compounds have higher self-polymerization reactivity than ethylene and can be self-polymerized when exposed to high temperatures during the process of being supplied by a flow path, pump, compressor, etc.

[0004] In this case, defects in devices such as clogging of the above-mentioned devices such as pumps, compressors, and flow paths, and blockage of the flow path can be caused, thereby reducing the production yield of the copolymer, making it difficult for the process to proceed uniformly and continuously, increasing the risk of accidents, and also posing a problem for the safety of workers.

[0005] Although methods of using additives together to suppress the self-polymerization of carboxylic acid-based monomers with high self-polymerization reactivity have been studied, nevertheless, defects in devices such as clogging and fouling of the above-mentioned devices due to monomer leakage still pose problems.

[0006] Therefore, in a situation where it is necessary to develop a lubricating composition for suppressing plugging that can improve the working yield and further improve the working stability by directly blocking the device defects caused by the leakage of the carboxylic acid-based monomer with high self-polymerization reactivity as described above.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Korean Published Patent Gazette No. 10-2016-0093679 (August 8, 2016) [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention aims to provide a plugging-suppressing lubricant composition that can suppress equipment defects such as fouling and clogging caused by the self-polymerization of monomers by increasing the coefficient of friction due to the leakage of carboxylic acid monomers into the lubricant composition.

[0009] Furthermore, the objective is to provide a lubricating composition for suppressing plugging that can block the aforementioned defects in the device and further improve process yield and work stability. [Means for solving the problem]

[0010] To achieve the above objective, the plugging-suppressing lubricating composition according to the present invention comprises a base oil and one selected from a fatty acid and an emulsifier, and forms a single phase when a carboxylic acid monomer flows into the base oil.

[0011] In a lubricating composition for suppressing plugging according to one embodiment of the present invention, the fatty acid may be an unsaturated fatty acid having 15 to 30 carbon atoms.

[0012] In a lubricating composition for suppressing plugging according to one embodiment of the present invention, the fatty acid may be present in an amount of 2 to 20% by weight relative to the total lubricating composition.

[0013] In a lubricating composition for suppressing plugging according to one embodiment of the present invention, the emulsifier may be present in an amount of 0.1 to 15% by weight relative to the total amount of the lubricating composition.

[0014] In a lubricating composition for suppressing plugging according to one embodiment of the present invention, the lubricating composition for suppressing plugging may contain all fatty acids and emulsifiers.

[0015] In a plugging-suppressing lubricant composition according to one embodiment of the present invention, the plugging-suppressing lubricant composition may be single-phase at a temperature in the range of 40 to 85°C.

[0016] In a plugging-suppressing lubricating composition according to one embodiment of the present invention, the amount of carboxylic acid monomers flowing into the plugging-suppressing lubricating composition may be 0.1 to 50% by weight.

[0017] In a lubricating composition for suppressing plugging according to one embodiment of the present invention, the lubricating composition for suppressing plugging can have a driving friction coefficient of less than 0.3 when a carboxylic acid monomer is introduced.

[0018] In a lubricating composition for suppressing plugging according to one embodiment of the present invention, the plugging-suppressing lubricating composition can suppress plugging at the discharge section at 55°C and 30N or higher.

[0019] The plugging suppression method according to the present invention includes, in the step of producing a copolymer derived from a carboxylic acid monomer, injecting the above-mentioned lubricating composition into a discharge section that discharges the carboxylic acid monomer to suppress the self-polymerization of the carboxylic acid monomer.

[0020] In a plugging suppression method according to one embodiment of the present invention, the injection rate of the plugging suppression lubricant composition into the discharge section can be 2 kg / hr to 50 kg / hr.

[0021] In a plugging suppression method according to one embodiment of the present invention, the temperature inside the discharge section may be 20 to 85°C, and the discharge pressure from the discharge section may be 1,000 to 3,000 bar. [Effects of the Invention]

[0022] The lubricating composition for plugging suppression according to the present invention suppresses an increase in the friction coefficient caused by leakage of a carboxylic acid monomer into the lubricating composition, improves miscibility, achieves the effects of an excellent lubricating composition, reduces the friction coefficient, suppresses the acceleration of self-polymerization due to the accumulation of the carboxylic acid monomer at specific locations and the increase in frictional force, suppresses and delays the self-polymerization of the carboxylic acid monomer, and has the effect of significantly suppressing the occurrence of plugging, fouling, and the like.

[0023] Further, the lubricating composition for plugging suppression according to the present invention is applied to the formation process of a copolymer derived from a carboxylic acid monomer, suppresses the polymerization reaction of the unnecessary or uninduced carboxylic acid monomer due to the leakage of the carboxylic acid monomer into the lubricating composition, suppresses the occurrence of clogging, flow path blockage, fouling, plugging, etc. in the above-mentioned devices such as pumps, compressors, and flow paths, reduces device defects, and has the effect of increasing the production process efficiency.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic diagram showing the plugging suppression principle of the lubricating composition according to an embodiment of the present invention. [Figure 2] It is a diagram showing the actual images of the disk and ball of the friction force measuring device.

Modes for Carrying Out the Invention

[0025] Hereinafter, the present invention will be described in more detail by way of specific examples or embodiments including the attached drawings. However, the following specific examples or embodiments are for reference in explaining the present invention in detail, and the present invention is not limited thereto and can be realized in various forms.

[0026] Furthermore, unless otherwise defined, all technical and scientific terms have the same meaning as that generally understood by one skilled in the art in which this invention pertains. The terms used in this invention are merely for the purpose of effectively describing specific examples and are not intended to limit the invention.

[0027] Furthermore, the singular form used in the specification and the attached claims may also include plural forms unless otherwise indicated in the context.

[0028] Furthermore, when a part is described as "containing" a certain component, unless otherwise specified, this means that it may include other components, rather than excluding them.

[0029] The term "(meth)acrylic acid" as used in this invention is used as a term that encompasses both "methacrylic acid" and "acrylic acid."

[0030] To achieve the above objective, the present invention provides a lubricating composition for suppressing plugging and a method for suppressing plugging using the same.

[0031] The inventors have conducted extensive research on lubricating compositions that can suppress plugging or fouling caused by monomers leaking onto the lubricating oil in a high-pressure pump used to inject monomers during the process of producing copolymers derived from carboxylic acid monomers, thereby suppressing equipment defects such as high-pressure pump blockage. Through this research, they have discovered that by producing a lubricating composition containing one of the following: a base oil, a fatty acid, or an emulsifier, even if monomers leak and flow in from the discharge section of the carboxylic acid monomer during the process, a single phase is formed, reducing the coefficient of friction and achieving the aforementioned effects. This led to the completion of the present invention.

[0032] The lubricating composition for suppressing plugging according to the present invention will be described in detail below.

[0033] The lubricating composition for suppressing plugging according to the present invention comprises a base oil and one selected from a fatty acid and an emulsifier, and can maintain a single phase when a carboxylic acid monomer flows into the lubricating composition relative to the base oil.

[0034] The base oil may be included as a base solvent, diluent, or medium in the lubricating composition. The type of base oil is not particularly limited, and lubricating oils used in polymerization equipment, petrochemical equipment, etc., can be used. For example, one or a mixture thereof can be used, selected from the group consisting of mineral oil, polyalphaolefin (PAO), alkylbenzene, alkylnaphthalene, polyvinyl ether, polyalkylene glycol, polycarbonate, polyol ester, ethylene alphaolefin copolymer, polybutene, polyethylene glycol, aromatic ester, hindered ester, dibasic ester, paraffinic mineral oil, and naphthenic mineral oil.

[0035] The aforementioned fatty acids can be unsaturated fatty acids with 15 to 30 carbon atoms. Specific examples include, but are not limited to, a mixture of one or more fatty acids selected from myristoleic acid, palmitoleic acid, oleic acid, linoleic acid, EPA (eicosapentaenoic acid), and DHA (docosahexaenoic acid).

[0036] A preferred embodiment of the lubricating composition may contain a base oil and a fatty acid, wherein the fatty acid may be present in an amount of 2 to 20% by weight relative to the total lubricating composition, more specifically 3 to 15% by weight, and more specifically 5 to 10% by weight. Within this content range, even if carboxylic acid monomers are introduced into the lubricating composition, phase separation does not occur, and the single phase has excellent miscibility. This reduces the increase in the coefficient of friction due to the introduction of carboxylic acid monomers, thereby suppressing the accumulation of carboxylic acid monomers that have leaked to specific locations and the self-polymerization of carboxylic acid monomers under high temperature and high pressure conditions, thus preventing plugging, which is preferable.

[0037] The emulsifier may be a nonionic surfactant, an anionic surfactant, or a cationic surfactant, and any known emulsifier can be used without limitation. Preferably, a polymeric surfactant can be used, and specifically, one or more mixtures of cationic polymers having polyethyleneimine groups and phosphonate groups and polyolefin polymers having polyisobutylene succinimide (PIBSI) groups can be used. Preferably, Thermoflo 7049 from Suez can be used as the cationic polymer having polyethyleneimine groups and phosphonate groups, and Prochem 3F18 from Suez can be used as the polyolefin polymer having polyisobutylene succinimide groups.

[0038] A preferred embodiment of the lubricating composition may include a base oil and an emulsifier, wherein the emulsifier may be present in an amount of 0.1 to 15% by weight of the total lubricating composition, specifically 1 to 15% by weight. Within this content range, when 0.1 to 50% by weight, specifically 0.1 to 30% by weight of carboxylic acid monomers is introduced relative to the base oil, phase separation does not occur, forming a single phase of emulsion with excellent miscibility. This reduces the increase in the coefficient of friction due to the introduction of carboxylic acid monomers, thereby suppressing the accumulation of carboxylic acid monomers leaked at specific locations and the self-polymerization of carboxylic acid monomers under high temperature and high pressure conditions, thus preventing plugging, which is preferable.

[0039] In one non-limiting embodiment, the lubricating composition for preventing plugging may contain all fatty acids and emulsifiers, wherein the fatty acids may be present in an amount of 1 to 15% by weight relative to the total lubricating composition, and the emulsifier may be present in an amount of 0.1 to 15% by weight. Within this content range, when 1 to 30% by weight of carboxylic acid monomers are introduced relative to the base oil, phase separation does not occur, a single phase of emulsion is formed, and excellent miscibility is achieved, preventing the accumulation of carboxylic acid monomers that have leaked to specific locations, and inhibiting the self-polymerization of carboxylic acid monomers under high temperature and high pressure conditions, thereby preventing plugging, which is preferable.

[0040] A lubricating composition for suppressing plugging according to one embodiment of the present invention can have a single phase in a temperature range of 20 to 85°C, more specifically, a single phase at a temperature of 50°C or higher, more specifically, a single phase at a temperature of 70°C or higher, and even more specifically, a single phase at a temperature of 75°C or higher. In this case, "single phase" may mean having a single homogeneous phase that is not separated into two or more phases.

[0041] More specifically, in the case of conventional lubricating compositions, as shown in Figure 1(a), when acrylic acid monomers leak and phase separation occurs, polyacrylic acid (PAA) is generated by the self-polymerization of the acrylic acid monomers due to frictional energy, causing plugging, fouling, etc. However, in the lubricating composition according to one embodiment of the present invention, as shown in Figure 1(b), even if acrylic acid monomers leak, phase separation does not occur, and a continuous single phase is formed. This suppresses the generation and accumulation of polyacrylic acid (PAA) at specific locations in the apparatus during processes under high temperature and high pressure conditions, thereby suppressing the occurrence of plugging, fouling, etc., which is preferable.

[0042] In the present invention, the content of the leaking carboxylic acid monomer may substantially mean the content leaked during the process, and to give a specific example, it may be more than 0% by weight of the lubricating composition, or it may be 0.01 to 30% by weight, but is not limited thereto. The lubricating composition for suppressing plugging according to one embodiment of the present invention may have a friction coefficient of less than 0.36 when the carboxylic acid monomer flows in, more specifically less than 0.3, more specifically less than 0.28, and even more specifically less than 0.25, but is not limited thereto.

[0043] A lubricating composition for suppressing plugging according to one embodiment of the present invention can have a drive friction coefficient (MTM TEST) of less than 0.4 when measured at 55°C and a ground load between balls and discs of 30N, and a drive friction coefficient (MTM TEST) of less than 0.3, specifically 0.28 or less, and more specifically less than 0.26, when measured at 55°C and a ground load between balls and discs of 60N.

[0044] A lubricating composition for suppressing plugging according to one embodiment of the present invention can suppress plugging of the discharge portion at a ground load of 30 N or more at 55°C, in which case the discharge portion may refer to the discharge portion described later.

[0045] The plugging-suppressing lubricating composition according to the present invention has the effect of suppressing problems such as plugging, fouling, etc., which occur when carboxylic acid monomers leaking into high-pressure pumps, cylinders, etc., are not mixed with the oil phase of lubricating oil in the discharge section and exist as separate phases, thereby accelerating self-polymerization due to friction with a coefficient of friction of 0.3 or more that occurs in the piston and packing section of the pump.

[0046] Thus, the present invention also provides a plugging inhibitor comprising one or two selected from a base oil, a fatty acid, and an emulsifier.

[0047] The following describes a method for suppressing plugging using the plugging-suppressing lubricant composition according to the present invention.

[0048] One embodiment of the plugging suppression method includes, in the step of producing a copolymer derived from a carboxylic acid monomer, injecting the above-mentioned lubricating composition into a discharge section that discharges the carboxylic acid monomer to suppress the self-polymerization of the carboxylic acid monomer.

[0049] The copolymer derived from the carboxylic acid monomer may specifically mean a copolymer derived from an olefin and a carboxylic acid monomer, and the olefin monomer may be one or more selected from ethylene, propylene, but but is not limited thereto.

[0050] The carboxylic acid monomer may include an unsaturated carboxylic acid capable of chain polymerization, and as a specific example, it may be one or more selected from (meth)acrylic acid or its esters. Particularly preferably, the copolymer may be an ethylene-acrylic acid copolymer, and the plugging-suppressing lubricating composition of the present invention can be suitably applied in the process of producing an ethylene-acrylic acid copolymer, but is not limited thereto.

[0051] The discharge section of a process for producing copolymers derived from carboxylic acid monomers may include a piston and a packing section, and the carboxylic acid monomer supplied through the discharge channel can be pumped or ejected by the reciprocating motion of the piston inside the packing section. The packing section may be a sealing member such as a bushing or cylinder. If the carboxylic acid monomer leaks into a gap between the piston and the packing section, the carboxylic acid monomer will accumulate locally, and repeated friction between the piston and the packing section in the gap will cause the carboxylic acid monomer to self-polymerize, forming an autopolymer such as polyacrylic acid (PAA), which can lead to fouling, plugging, and other problems.

[0052] A lubricating composition for suppressing plugging, according to one embodiment of the present invention, when injected into the discharge section described above, exhibits excellent miscibility and forms a single phase even if carboxylic acid monomers leak, thereby suppressing local concentration increases and self-polymerization of carboxylic acid monomers, and suppressing plugging and fouling.

[0053] In this case, the injection rate of the plugging-suppressing lubricating composition into the discharge section may be 2 to 50 kg / hr, the temperature inside the discharge section may be 20 to 85°C, and the discharge pressure from the discharge section may be 1,000 to 3,000 bar, but is not limited thereto.

[0054] The lubricating composition for suppressing plugging according to the present invention has the effect of suppressing unnecessary or uninduced polymerization reactions in copolymer formation steps derived from carboxylic acid monomers, thereby suppressing clogging, flow blockage, fouling, plugging, and other issues in the aforementioned equipment such as pumps, compressors, and flow channels, reducing equipment defects, and increasing production process efficiency.

[0055] The present invention will be described in more detail below based on examples and comparative examples. However, the following examples and comparative examples are merely illustrative examples for illustrating the present invention in more detail, and the present invention is not limited to the following examples and comparative examples.

[0056] [Experimental Method] 1. MTM (Mini-Traction Machine) Test A sample solution was prepared by mixing the manufactured lubricating composition with acrylic acid (AA) (99% purity, manufactured by Sigma-Aldrich). During this process, any existing polymerization inhibitors in the acrylic acid were removed by distillation to eliminate the possibility of polymerization inhibitors inhibiting self-polymerization. The prepared sample solution was then used to observe whether self-polymerization occurred while rotating a disc and ball using a friction force measuring device (MTM (Mini-Traction Machine) 2) as shown in Figure 2. The sample solution was supplied into the disc through an inlet connected to the ball at an initial temperature of 55°C, and then the disc and ball were rotated together to bring them into contact with the sample solution. The presence or absence of self-polymerization was observed while varying the load between the disc and ball, and the slide-roll ratio (SRR) between the ball and disc.

[0057] [Example 1] A lubricating composition with an oleic acid content of 3 wt% was prepared by mixing 67.9 g of HYPERCOMP-1000 (manufactured by SK Innovation Co., Ltd.) with 2.1 g of oleic acid in a 100 ml container using a magnetic bar at room temperature for more than 30 minutes.

[0058] [Example 2] A lubricating composition was prepared in the same manner as in Example 1, except that 6.3 g of oleic acid was mixed with 63.7 g of base oil so that the oleic acid content was 9 wt%.

[0059] [Example 3] A lubricating composition with an emulsifier content of 2.4 wt% was prepared by mixing 68.32 g of HYPERCOMP-1000 (manufactured by SK Innovation) as a base oil with 1.68 g of emulsifier (Thermoflo 7049 manufactured by Suez) in a 100 ml container using a magnetic bar at room temperature for more than 30 minutes.

[0060] [Example 4] A lubricating composition was prepared in the same manner as in Example 3, except that 64.82 g of base oil was mixed with 5.18 g of emulsifier (Thermoflo 7049 manufactured by Suez) so that the emulsifier content was 7.4 wt%.

[0061] [Example 5] A lubricating composition was prepared by mixing 67.2g of HYPERCOMP-1000 (manufactured by SK Innovation Co., Ltd.) as a base oil with 2.1g of oleic acid and 0.7g of emulsifier (Thermoflo 7049, manufactured by Suez) in a 100ml container using a magnetic bar at room temperature for more than 30 minutes, resulting in an oleic acid content of 3 wt% and an emulsifier content of 1 wt%.

[0062] [Comparative Example 1] HYPERCOMP-1000 (manufactured by SK Innovation Co., Ltd.) was used as the base oil.

[0063] The properties of the lubricating compositions prepared in Examples 1 to 5 and Comparative Example 1 were evaluated as follows.

[0064] [Experimental Example 1] Phase separation pattern of lubricating composition depending on temperature and acrylic acid content 30 g of acrylic acid was mixed with the lubricating compositions prepared in Examples 1 to 5, and the phase separation of the mixture is shown in Table 1 below.

[0065] Furthermore, 17.5 g of acrylic acid was added to the lubricating compositions prepared in Example 1 and Example 2, respectively, and these were designated as Example 6 and Example 7. The phase separation patterns of the mixtures are shown in Table 1 below.

[0066] [Table 1]

[0067] [Experimental Example 2] Evaluation of MTM Test for Lubricating Compositions As shown in Table 2 above, the lubricating compositions of Examples 1 to 7 and Comparative Example 1, which contain acrylic acid, were evaluated using the MTM test and are shown in Table 2 below.

[0068] In this study, the control group used HYPERCOMP1000 (manufactured by SK Innovation Co., Ltd.) as the base oil, without mixing in acrylic acid.

[0069] [Table 2]

[0070] As shown in Table 1 above, in the control group, which does not contain acrylic acid and uses base oil alone, the coefficient of friction was maintained at 0.1, whereas when acrylic acid was included, the coefficient of friction increased. In this case, the examples containing oleic acid and / or emulsifiers showed a lower coefficient of friction compared to Comparative Example 1, which did not contain these agents, and in particular, the reduction in the coefficient of friction was greater under harsh conditions where a larger load was applied even at the same temperature. Furthermore, Examples 6 and 7, which had a low acrylic acid content, showed a lower coefficient of friction compared to Examples 1-5, which had a high acrylic acid content. This means that even when acrylic acid is introduced into the lubricating composition, a rapid increase in the coefficient of friction is suppressed, delaying and suppressing the occurrence of plugging due to the self-polymerization of acrylic acid in specific areas. Also, when the content of the introduced acrylic acid is low, the coefficient of friction becomes even lower, resulting in sufficiently stable miscibility, improving the lubrication performance to the level of the control group and further suppressing the generation of PAA.

[0071] More specifically, as shown in Tables 1 and 2 above, when acrylic acid and base oil have excellent miscibility as single phases, it was confirmed that the phenomenon of polyacrylic acid (PAA), a self-polymer of acrylic acid that causes plugging, is suppressed and delayed under conditions of 55°C and 30N or higher. Furthermore, as shown in Examples 3 and 4, when an emulsifier is used to form a single phase of the emulsion, it was confirmed that the formation of polyacrylic acid (PAA) is also mitigated.

[0072] Furthermore, as shown in Table 2, in Example 3, which contained sufficient oleic acid on the base oil, no PAA formation occurred even under harsh conditions up to 60N, confirming excellent lubrication. Similarly, in Examples 4 and 5, which contained an emulsifier, no PAA formation occurred even under harsh conditions up to 75N, confirming excellent lubrication. In contrast, in Comparative Example 1, which used a single type of base oil, the presence of acrylic acid made PAA formation more likely, resulting in plugging and making MTM testing impossible.

[0073] Although the present invention has been described above with reference to specific details, limited embodiments, and drawings, these are provided to facilitate a more general understanding of the invention, and the invention is not limited to the embodiments described above. Various modifications and variations can be made from such descriptions by those who have ordinary skill in the art to which the invention pertains.

[0074] Therefore, the concept of the present invention should not be limited to the embodiments described above. Not only the claims described later, but also all things that are equivalent to or have equivalent variations to these claims can be said to fall within the scope of the concept of the present invention.

Claims

1. A lubricating composition for suppressing plugging in an apparatus for producing copolymers derived from carboxylic acid monomers, Base oil and Contains fatty acids, When a carboxylic acid monomer is introduced into the base oil, it forms a single phase or emulsion. The aforementioned fatty acid is an unsaturated fatty acid having 15 to 30 carbon atoms. The aforementioned fatty acid is present in a lubricating composition for suppressing plugging in an amount of 5 to 20% by weight relative to the total lubricating composition.

2. A lubricating composition for suppressing plugging in an apparatus for producing copolymers derived from carboxylic acid monomers, Base oil and Contains emulsifiers, When a carboxylic acid monomer is introduced into the base oil, it forms a single phase or emulsion. The emulsifier is a mixture of one or more selected from cationic polymers having polyethyleneimine groups and phosphonate groups, and polyolefin polymers having polyisobutylene succinimide (PIBSI) groups. The aforementioned emulsifier is present in a lubricating composition for suppressing plugging in an amount of 1 to 15% by weight relative to the total lubricating composition.

3. A lubricating composition for suppressing plugging in an apparatus for producing copolymers derived from carboxylic acid monomers, Base oil and Contains fatty acids and emulsifiers, When a carboxylic acid monomer is introduced into the base oil, it forms a single phase or emulsion. The aforementioned fatty acid is an unsaturated fatty acid having 15 to 30 carbon atoms. The aforementioned fatty acid is present in an amount of 1 to 15% by weight relative to the total lubricating composition. The emulsifier is a mixture of one or more selected from cationic polymers having polyethyleneimine groups and phosphonate groups, and polyolefin polymers having polyisobutylene succinimide (PIBSI) groups. The aforementioned emulsifier is present in a lubricating composition for suppressing plugging in an amount of 1 to 15% by weight relative to the total lubricating composition.

4. The plugging-suppressing lubricating composition is a single-phase or emulsion at a temperature in the range of 40 to 85°C when a carboxylic acid monomer is introduced, according to any one of claims 1 to 3.

5. The plugging-suppressing lubricating composition according to any one of claims 1 to 3, wherein the amount of carboxylic acid monomers introduced into the plugging-suppressing lubricating composition is 0.1 to 50% by weight.

6. The plugging-suppressing lubricating composition is the plugging-suppressing lubricating composition according to any one of claims 1 to 3, wherein the driving friction coefficient when a carboxylic acid monomer flows in is less than 0.

3.

7. The plugging-suppressing lubricating composition suppresses plugging in the discharge section that discharges the carboxylic acid monomer in the apparatus at 55°C and 30N or higher, according to any one of claims 1 to 3.

8. A method for suppressing plugging of a dispensing unit in a process of producing a copolymer derived from a carboxylic acid monomer using an apparatus equipped with a dispensing unit for dispensing a carboxylic acid monomer, A plugging suppression method comprising injecting the lubricating composition according to any one of claims 1 to 7 into a discharge section that discharges the carboxylic acid monomer, thereby suppressing the self-polymerization of the carboxylic acid monomer.

9. The plugging suppression method according to claim 8, wherein the injection rate of the plugging suppression lubricant composition into the discharge section is 2 kg / hr to 50 kg / hr.

10. The plugging suppression method according to claim 9, wherein the temperature inside the discharge section is 20 to 85°C, and the discharge pressure from the discharge section is 1,000 to 3,000 bar.

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