Concentrated lubricant composition for belt conveyors and method for improving the lubricity of belt conveyors

Abstract

To provide a concentrated lubricant composition for a belt conveyer which imparts good lubricity during transportation to a resin conveyor and a metallic conveyor for transportation of a container for a beverage product, a food product, etc. as well as excellent sterilization property against not only general bacteria but also cationic surfactant-resistivity bacteria, and good storage stability in long-term storage, and a lubrication improvement method of a belt conveyer using the same.SOLUTION: A concentrated lubricant composition for a belt conveyer is characterized by containing an anionic surfactant represented by the general formula (1) as an (A) component, a cationic surfactant as a (B) component, L-glutamic acid diacetate salt as a (C) component, and water as a (D) component.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a concentrated lubricant composition for belt conveyors and a method for improving the lubricity of a belt conveyor using the concentrated lubricant composition for belt conveyors, and more specifically to a concentrated lubricant composition for belt conveyors used when moving and conveying plastic containers, paper containers, metal containers, glass containers, ceramic containers, etc. in the process of filling or packaging beverages such as drinking water, soft drinks, milk, juice, tea, coffee, black tea, dairy drinks, carbonated drinks, beer, alcoholic beverages, and energy drinks, as well as foods such as seasonings and processed foods into containers, and a method for improving the lubricity of a belt conveyor. [Background technology]

[0002] The containers used for the beverages, foods, and the like described above include plastic containers made of polyethylene terephthalate or the like, paper containers, metal containers, glass containers, ceramic containers, and the like. In beverage and food manufacturing plants, belt conveyors are commonly used to continuously transport large quantities of containers during the filling and packaging processes for these containers. In such plants, it is common for the belt conveyor to operate continuously to transport containers and other transported objects at high speeds. However, friction generated at the contact surface between the containers and the belt conveyor can sometimes cause the containers to deform or tip over. To prevent such problems, it is common for a lubricant to be applied or sprayed onto the belt conveyor to reduce the coefficient of friction between the containers and the transported objects.

[0003] Aqueous solutions containing surfactants are generally used as belt conveyor lubricants. In addition, due to hygiene concerns, belt conveyors are required to be protected from contamination by various bacteria, and therefore belt conveyor lubricants containing a bactericidal component in addition to a lubricating component have been proposed.

[0004] For example, Patent Document 1 discloses a lubricant for conveyor belts, which comprises an aqueous solution containing a cationic surfactant having bactericidal properties and an alkyl phosphate ester salt that has good compatibility with the cationic surfactant and has excellent lubrication properties on metal conveyors. Furthermore, Patent Document 2 discloses a bactericidal conveyor lubricant in which a phosphate ester-type anionic surfactant and a quaternary ammonium salt-type surfactant are blended in a specific ratio. Furthermore, Patent Document 3 proposes a disinfecting lubricant composition for conveyors containing 2-methyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, a cationic surfactant, a chelating agent, and water. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 2797289 [Patent Document 2] Patent No. 3126338 [Patent Document 3] Patent No. 5843645 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] However, the lubricants described in Patent Documents 1 and 2 have the problem that bacteria resistant to cationic surfactants grow in the environment in which the lubricant is used, causing contamination by biofilms and polluting the environment. On the other hand, Patent Document 3 describes that the antibacterial lubricant composition for conveyors described in Patent Document 3 can disinfect or inhibit not only general bacteria but also bacteria resistant to cationic surfactants. However, the antibacterial lubricant composition for conveyors described in Patent Document 3 has poor storage stability, and it has been practically difficult to provide it as a concentrated composition, which is expected to have a long storage period.

[0007] Therefore, an object of the present invention is to provide a concentrated lubricant composition for belt conveyors which has good lubrication properties during conveyance on resin conveyors and metal conveyors for conveying containers for beverages, food, etc., and which has excellent disinfecting properties not only against general bacteria but also against cationic surfactant-resistant bacteria, and which exhibits good storage stability even when stored for a long period of time, and a method for improving the lubricity of belt conveyors using the same. [Means for solving the problem]

[0008] In order to solve the above problems, the present inventors have conducted extensive research and have found that by using a concentrated antibacterial lubricant composition for conveyors containing (A) an anionic surfactant having a specific structure, (B) a cationic surfactant, (C) L-glutamic acid diacetate, and (D) water, the composition not only exhibits good lubrication properties but also excels in antibacterial properties against not only general bacteria but also bacteria resistant to cationic surfactants, and further has excellent storage stability, making it substantially possible to provide the composition as a concentrated composition, thereby completing the present invention.

[0009] That is, the present invention is (1) As the component (A), an anionic surfactant represented by the following general formula (1): [ka] (In the formula, R1 is a hydrocarbon group having 6 to 18 carbon atoms which may have an oxygen atom or a nitrogen atom, n is the average number of moles of ethylene oxide added and is 2 to 7, m is 1 or 2, and M1 is any one of hydrogen, an alkali metal, an amine, and NH4.) a cationic surfactant as component (B); (C) L-glutamic acid diacetate as a component, (D) Water as a component; Contains death, The mass ratio (B) / (C) of the component (B) to the component (C) is 0.14 or more and 2.50 or less. A concentrated lubricant composition for a belt conveyor, (2) The concentrated lubricant composition for a belt conveyor according to (1) above, wherein the cationic surfactant of component (B) is at least one selected from alkyldimethylbenzylammonium chloride, didecyldimethylammonium chloride, didecyldimethylammonium methosulfate, dioctyldimethylammonium chloride, octyldecyldimethylammonium chloride, alkyldimethylhydroxyethylammonium chloride, and N,N-didecyl-N-methyl-polyoxyethyl-ammonium propionate. ( 3 ) (1) above, which contains as component (E) at least one selected from ethylenediaminetetraacetate, diethylenetriaminepentaacetate, triethylenetetraaminehexaacetate, 1,3-propanediaminetetraacetate, and 1,3-diamino-2-hydroxypropanetetraacetate. or (2) The belt conveyor lubricant concentrate composition according to any one of the preceding claims. ( 4 ) Furthermore, as component (F), it contains 1% by mass or more and 6% by mass or less of a nonionic surfactant produced by adding alkylene oxide to an aliphatic alcohol having 9 to 18 carbon atoms in the hydrocarbon group. The above (1)~( 3 The belt conveyor lubricant concentrate composition according to any one of the above items (1) to (4). ( 5 ) The above (1) to (2) further contain, as a component (G), at least one polyol selected from glycerin, propylene glycol, and polyethylene glycol in an amount of 20% by mass or more and 45% by mass or less. 4 ) The belt conveyor lubricant concentrate composition according to any one of ( 6 ) The composition of any one of (1) to (3), wherein the pH of the composition at 25°C is 7.0 or more and 11.0 or less. 5 2. The concentrated lubricant composition for a belt conveyor according to claim 1, ( 7 ) above (1) ~ ( 6a method for improving the lubricity of a belt conveyor, the method comprising: continuously supplying a treatment liquid prepared by using the concentrated conveyor lubricant composition according to any one of the above items (1) to (4) above, so that the concentration of component (A) contained in the concentrated conveyor lubricant composition is in the range of 0.005% by mass or more and 0.1% by mass or less, onto a belt conveyor that conveys an object to be conveyed; ( 8 ) above (1) ~ ( 6 The belt conveyor lubricant concentrate composition according to any one of the above items (1) to (4), a method for improving the lubricity of a belt conveyor, comprising intermittently supplying a treatment liquid, which is prepared so that the concentration of component (A) contained in the concentrated belt conveyor lubricant composition is in the range of 0.005% by mass or more and 0.1% by mass or less, onto a belt conveyor that conveys an object to be conveyed, in such a manner that the ratio of treatment liquid supply step time: treatment liquid supply stop step time is 10:1 to 1:4; ( 9 ) above (1) ~ ( 6 a treatment liquid prepared by using the concentrated lubricant composition for a belt conveyor according to any one of the above items (1) to (3), so that the concentration of component (A) contained in the concentrated lubricant composition for a belt conveyor is in the range of 0.04 mass % or more and 1 mass % or less, and intermittently supplying the treatment liquid onto a belt conveyor conveying an object to be conveyed and / or onto the object to be conveyed, in such a manner that the treatment liquid supply step time:treatment liquid supply stop time = 1:10 to 1:360; ( 10 ) The above belt conveyor is a resin conveyor Any one of (7) to (9) The method for improving the lubricity of a belt conveyor according to claim 1, The gist of this paper is as follows. [Effects of the Invention]

[0010] The concentrated belt conveyor lubricant composition of the present invention has excellent lubrication and antibacterial properties for beverage containers, food containers, etc., on plastic conveyors and metal conveyors such as stainless steel. The antibacterial effect of the present invention is effective not only against general bacteria but also against cationic surfactant-resistant bacteria. Furthermore, the concentrated belt conveyor lubricant composition of the present invention has excellent storage stability, and is unlikely to become cloudy, turn brown, or produce precipitates, even after long-term storage. Therefore, the present invention substantially makes it possible to provide a concentrated belt conveyor lubricant composition that is expected to be stored for long periods of time. Furthermore, the method for improving the lubricity of a belt conveyor of the present invention enjoys the excellent effects of the concentrated lubricant composition for a belt conveyor of the present invention described above, enabling smooth transportation of containers for food and beverages, and improving the sanitary condition of the belt conveyor used for transportation. DETAILED DESCRIPTION OF THE INVENTION

[0011] The anionic surfactant of component (A) in the concentrated lubricant composition for belt conveyors of the present invention is a compound represented by the following general formula (1): In the following, ethylene oxide in general formula (1) may be simply referred to as EO. [ka] (In the formula, R1 is a hydrocarbon group having 6 to 18 carbon atoms which may have an oxygen atom or a nitrogen atom, n is the average number of moles of ethylene oxide added and is 2 to 7, m is 1 or 2, and M1 is any one of hydrogen, an alkali metal, an amine, and NH4.)

[0012] In general formula (1), R1 is a hydrocarbon group having 6 to 18 carbon atoms. Examples of such hydrocarbon groups include hexyl, heptyl, octyl, isooctyl, nonyl, decyl, isodecyl, undecyl, dodecyl, tridecyl, isotridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, isooctadecyl, hexadecenyl, and octadecenyl. Among these, dodecyl, isotridecyl, octadecyl, and octadecenyl groups are preferred because of their excellent lubricity, and dodecyl and octadecenyl groups are more preferred as R1.

[0013] In the general formula (1), n, which represents the average number of moles of ethylene oxide added, is 2 to 7. If n exceeds the above range, the lubricity and storage stability may be insufficient.

[0014] In general formula (1), m is 1 or 2, and preferably 1 because it provides excellent lubricity. However, since it is difficult to purify ethylene oxide as a single component in terms of chemical synthesis, the concentrated belt conveyor lubricant composition of the present invention may contain, as component (A), both an anionic surfactant in which m is 1 and an anionic surfactant in which m is 2. If m is 3, the lubricity and water solubility are significantly reduced, which is not preferred.

[0015] In the general formula (1), M1 is any one of hydrogen, an alkali metal, an alkaline earth metal, an amine, and NH4. Examples of the alkali metal include sodium and potassium, and examples of the alkaline earth metal include magnesium and calcium. Examples of the amines include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N,N-dimethylethanolamine, N,N-dibutylethanolamine, N-(β-aminoethyl)ethanolamine, N-methylethanolamine, N-methyldiethanolamine, N-ethylethanolamine, N-ethyldiethanolamine, Nn-butyldiethanolamine, Nt-butylethanolamine, Nt-butyldiethanolamine, N-(β-aminoethyl)isopropanolamine, N,N-diethylisopropanolamine, 2-amino-2-hydroxymethyl-1,3-propanediol, aminomethylpropanol, and tetrahydroxypropylethylenediamine, which may be used alone or in combination. Component (A) may be a single compound in which M1 in general formula (1) is any of hydrogen, alkali metal, alkaline earth metal, amines, and NH4, or a combination of two or more compounds in which M1 is different. Of these, component (A) in which M1 is one or more selected from sodium, potassium, monoethanolamine, triethanolamine, and monoisopropanolamine is preferred because of its excellent lubricity, and more preferably component (A) in which M1 is monoethanolamine, component (A) in which M1 is triethanolamine, and component (A) in which M1 is monoisopropanolamine is preferred because of its excellent storage stability.

[0016] The anionic surfactant of component (A) may be a single compound in which R1, a hydrocarbon group having 6 to 18 carbon atoms, and n, m, and M1, which indicate the average number of moles of ethylene oxide added, in general formula (1), are all the same, or it may contain two or more compounds in which any or all of these are different. More specific examples of the anionic surfactant represented by general formula (1) include sodium salts, potassium salts, monoethanolamine salts, diethanolamine salts, triethanolamine salts, and the like of compounds selected from the group consisting of polyoxyethylene (4 moles of EO) C6-C10 alkyl ether phosphate, polyoxyethylene (2 moles of EO) lauryl ether phosphate, polyoxyethylene (4 moles of EO) lauryl ether phosphate, polyoxyethylene (3 moles of EO) tridecyl ether phosphate, polyoxyethylene (6 moles of EO) tridecyl ether phosphate, polyoxyethylene (2 moles of EO) stearyl ether phosphate, polyoxyethylene (3 moles of EO) stearyl ether phosphate, polyoxyethylene (4 moles of EO) oleyl ether phosphate, and polyoxyethylene (7 moles of EO) oleyl ether phosphate, and combinations of two or more thereof. Note that the above-listed phosphoric acids include phosphate esters. From the viewpoint of being able to exhibit particularly excellent lubricity, it is preferable that component (A) contains one or more selected from polyoxyethylene (2 moles of EO) lauryl ether phosphate, polyoxyethylene (4 moles of EO) lauryl ether phosphate, polyoxyethylene (4 moles of EO) oleyl ether phosphate, and polyoxyethylene (7 moles of EO) oleyl ether phosphate.

[0017] The content of component (A) in the concentrated belt conveyor lubricant composition of the present invention is preferably 2% by mass or more and 10% by mass or less, more preferably 2% by mass or more and 8% by mass or less, even more preferably 3% by mass or more and 7% by mass or less, and particularly preferably 3% by mass or more and 6% by mass or less. If the content of component (A) is less than 2% by mass, the lubricity may be insufficient when used with metal conveyors such as stainless steel conveyors. If the content exceeds 10% by mass, the lubricity may be insufficient when used with plastic conveyors. Note that when M1 in component (A) is an alkali metal, alkaline earth metal, amine, or NH4, the proportion of component (A) in the concentrated belt conveyor lubricant composition of the present invention is the proportion calculated by converting M1 of the component into hydrogen.

[0018] While the above-described component (A) can exhibit excellent belt conveyor lubrication, similar to other phosphate ester-type anionic surfactants, typical compositions containing component (A) lack sufficient disinfection properties (especially against cationic surfactant-resistant bacteria), and when diluted to form a concentrated composition, precipitates may form. In contrast, the belt conveyor lubricant concentrated composition of the present invention, by combining component (A) with components (B) and (C) described below, exhibits good lubrication, is excellent in disinfection properties against not only general bacteria but also cationic surfactant-resistant bacteria, and has excellent storage stability. Furthermore, the present invention is preferable as a concentrate because of its excellent dilution stability.

[0019] Component (B) in the belt conveyor lubricant concentrate composition of the present invention is a cationic surfactant. Examples of cationic surfactants include benzethonium chloride, alkyldimethylhydroxyethylammonium salts, didecyldimethylammonium salts, dioctyldimethylammonium salts, octyldecyldimethylammonium salts, decylisononyldimethylammonium salts, didecylmethylpolyoxyethyleneammonium salts, alkylbenzylimidazolium salts, alkyldimethylbenzylammonium salts, alkyldimethylethylbenzylammonium salts, alkyldimethylmethylbenzylammonium salts, cetylpyridinium chloride, trialkylamine salts, alkyltriamine salts, polyhexamethylene biguanide hydrochloride, chlorhexidine gluconate, chlorhexidine hydrochloride, and 1,4-bis(3,3'-(1-decylpyridinium)methyloxy)butane dibromide. These may be used as component (B) alone or in combination. Examples of the salt of the cationic surfactant of the component (B) include chloride ions, bromide ions, alkyl sulfate ester ions having 1 or 2 carbon atoms, fatty acid ions having at least 1 but not more than 12 carbon atoms, and benzenesulfonate ions optionally substituted with at least one but not more than three alkyl groups having at least one but not more than three carbon atoms. Among these, component (B) preferably contains one or more selected from alkyl dimethyl benzyl ammonium chloride, didecyl dimethyl ammonium chloride, didecyl dimethyl ammonium methosulfate, dioctyl dimethyl ammonium chloride, octyl decyl dimethyl ammonium chloride, alkyl dimethyl hydroxyethyl ammonium chloride, and N,N-didecyl-N-methyl-polyoxyethyl ammonium propionate, due to its excellent disinfecting properties. More preferably, component (B) contains one or more selected from didecyl dimethyl ammonium chloride, didecyl dimethyl ammonium methosulfate, octyl decyl dimethyl ammonium chloride, and alkyl dimethyl hydroxyethyl ammonium chloride, due to its excellent disinfecting properties against cationic surfactant-resistant bacteria.

[0020] The (B) component is preferably contained in the belt conveyor lubricant concentrated composition of the present invention in an amount of 1% by mass or more and 15% by mass or less, more preferably 2% by mass or more and 10% by mass or less, and particularly preferably 3% by mass or more and 7% by mass or less. If the (B) component content is less than 2% by mass, the antibacterial properties and lubrication of stainless steel conveyors may be insufficient. If the (B) component content is greater than 15% by mass, the problem of reduced miscibility with beverages may occur, and the lubrication of plastic conveyors may be insufficient. In this context, the problem of reduced miscibility with beverages refers to the incompatibility of beverages spilled on or around belt conveyors such as filling machines, bottle capping machines, and can end seamers with the lubricant supplied to or around the belt conveyor, resulting in the formation of precipitates. Such problems can lead to contamination of the conveying environment by precipitates (foreign matter) formed inside the belt conveyor and its surrounding equipment, which is undesirable from a hygienic standpoint.

[0021] Component (C) in the concentrated belt conveyor lubricant composition of the invention is L-glutamic acid diacetate, and examples of the salt include alkali metal salts, ammonium salts, and alkanolamine salts such as monoethanolamine, triethanolamine, and monoisopropanolamine. In the present invention, component (C) may be one type of L-glutamic acid diacetate, or may contain two or more types of L-glutamic acid diacetate that are different salts.

[0022] The content of component (C) in the concentrated belt conveyor lubricant composition of the present invention is preferably 6% by mass or more and 15% by mass or less, more preferably 8% by mass or more and 15% by mass or less, and particularly preferably 10% by mass or more and 15% by mass or less. If the content of component (C) is less than 6% by mass, the disinfection ability against cationic surfactant-resistant bacteria, lubricity, and dilution stability may be insufficient. Even if the content exceeds 15% by mass, the performance plateaus, making it undesirable from a cost perspective. In the present invention, dilution stability refers to the stability of the concentrated composition when diluted to a concentration suitable for use. If the dilution stability is poor, precipitates will form in the treatment solution obtained by diluting the concentrated composition, making it unusable. The concentrated belt conveyor lubricant composition of the present invention, which contains the above-described component (A) as a lubricating component, exhibits good dilution stability due to the inclusion of component (C).

[0023] In the concentrated belt conveyor lubricant composition of the present invention, the water (D), component (D), is not particularly limited, and examples thereof include tap water, well water, ion-exchanged water, soft water, etc. Examples of tap water include tap water from Arakawa Ward, Tokyo (pH = 7.6, total alkalinity (calcium carbonate equivalent) 40.5 mg / L, German hardness 2.3°DH (including calcium hardness 1.7°DH and magnesium hardness 0.6°DH), chloride ions 21.9 mg / L, sodium and its compounds 15 mg / L, nitrate nitrogen and nitrite nitrogen 1.2 mg / L, fluorine and its compounds 0.1 mg / L, boron and its compounds 0.04 mg / L, total trihalomethanes 0.016 mg / L, residual chlorine 0.4 mg / L, and organic matter (total organic carbon) 0.7 mg / L).

[0024] In the concentrated belt conveyor lubricant composition of the present invention, the mass ratio (B) / (C) of component (B) to component (C) is preferably 0.14 or more and 2.50 or less. From the viewpoints of disinfection ability against cationic surfactant-resistant bacteria, lubricity, and dilution solution stability, it is more preferably 0.20 or more and 0.90 or less, and particularly preferably 0.20 or more and 0.70 or less. In this way, by adjusting the blending ratio of component (B) to component (C), the intended object of the present invention can be more effectively achieved. If the mass ratio (B) / (C) is less than 0.14, disinfection ability against general bacteria and cationic surfactant-resistant bacteria and lubricity for metal conveyors such as stainless steel may be insufficient. If it exceeds 2.50, lubricity for plastic conveyors may be insufficient.

[0025] The concentrated belt conveyor lubricant composition of the present invention preferably further contains, as component (E), at least one selected from ethylenediaminetetraacetate, diethylenetriaminepentaacetate, triethylenetetraaminehexaacetate, 1,3-propanediaminetetraacetate, and 1,3-diamino-2-hydroxypropanetetraacetate. These may be used alone or in combination. Examples of salt forms of component (E) include alkali metal salts, ammonium salts, and alkanolamine salts such as monoethanolamine, triethanolamine, and monoisopropanolamine. Among these, ethylenediaminetetraacetate is preferred as component (E) from the viewpoints of disinfecting properties and dilution stability. The concentrated belt conveyor lubricant composition of the present invention preferably contains component (E) in an amount of 0.4% by mass or more and 8% by mass or less, more preferably 0.5% by mass or more and 4% by mass or less, and particularly preferably 1% by mass or more and 3% by mass or less. If the content of component (E) is less than 0.4% by mass, the stability of the diluted solution may decrease, and even if it is blended in at more than 8% by mass, the performance will plateau, which is not preferable from the standpoint of cost.

[0026] The belt conveyor lubricant concentrate composition of the present invention preferably further contains, as component (F), a nonionic surfactant produced by adding an alkylene oxide such as ethylene oxide to an aliphatic alcohol having a hydrocarbon group with 9 to 18 carbon atoms. Examples of hydrocarbon groups in the aliphatic alcohol that can be used in component (F) include nonyl, decyl, isodecyl, undecyl, dodecyl, tridecyl, isotridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, isooctadecyl, and octadecenyl groups, and these may be used alone or in combination. Among these, nonyl, decyl, isodecyl, undecyl, dodecyl, tetradecyl, hexadecyl, octadecyl, and octadecenyl groups are preferred due to their excellent lubricity, and nonyl, decyl, undecyl, and dodecyl groups are more preferred due to their excellent lubricity, particularly for stainless steel conveyors.

[0027] Component (F) is obtained by adding an alkylene oxide to the above-mentioned aliphatic alcohol. Examples of alkylene oxides include ethylene oxide, propylene oxide, and butylene oxide, with ethylene oxide and propylene oxide being preferred from an economical perspective. The alkylene oxide may be polymerized in either a homopolymer or a copolymer, with a homopolymer of ethylene oxide being preferred. The copolymerization may be a random copolymer, block copolymer, or random / block copolymer of ethylene oxide and propylene oxide. The nonionic surfactant of component (F) preferably has a degree of polymerization of the polyoxyalkylene group (ethylene oxide + propylene oxide) of 6 to 20, more preferably 6 to 15, and even more preferably 6 to 11. If the degree of polymerization of the polyoxyalkylene group is less than 6, the storage stability of the concentrated belt conveyor lubricant composition may be insufficient, while if it exceeds 20, the lubricity of a stainless steel conveyor may be insufficient. The nonionic surfactant (F) preferably has an ethylene oxide group content of 50 mol% or more and 100 mol% or less, more preferably 60 mol% or more and 100 mol% or less, of the polyoxyalkylene groups. If the ethylene oxide group content is less than 50 mol%, the storage stability of the concentrated belt conveyor lubricant composition may be reduced. The (F) component is preferably contained in the concentrated belt conveyor lubricant composition of the present invention at 1 mass% or more and 6 mass% or less, more preferably 1 mass% or more and 4 mass% or less, and particularly preferably 1 mass% or more and 3 mass% or less. If the (F) component content is less than 1 mass%, the mixability of the concentrated belt conveyor lubricant composition with beverages may be reduced. On the other hand, if the (F) component is contained in an amount exceeding 6 mass%, the lubrication of the stainless steel conveyor may be insufficient.

[0028] The concentrated lubricant composition for a belt conveyor of the present invention preferably further contains, as component (G), one or more polyols selected from the group consisting of glycerin, propylene glycol, and polyethylene glycol. The degree of polymerization (average number of moles added) of ethylene oxide to polyethylene glycol is preferably 4 to 20 moles, more preferably 4 to 16 moles, and particularly preferably 4 to 8 moles. If the degree of polymerization (average number of moles added) of polyethylene glycol is less than 4 moles or more than 20 moles, the lubricity may be insufficient. As component (G), glycerin and / or polyethylene glycol are preferably used because of their excellent lubricity, and glycerin is particularly preferred from the standpoint of economy. The concentrated lubricant composition for a belt conveyor of the present invention preferably contains component (G) in an amount of 20 to 60% by mass, more preferably 30 to 45% by mass, and particularly preferably 30 to 40% by mass. If the content of component (G) is less than 20% by mass, the lubricity may be insufficient when the resin conveyor is used intermittently for a long period of time, and if the content exceeds 60% by mass, the lubricating performance saturates, which is not economically preferable, and the storage stability of the concentrated lubricant composition for a belt conveyor may be insufficient. Note that long-term intermittent use refers to a mode in which a supply step of supplying a treatment liquid prepared by diluting the concentrated lubricant composition for a belt conveyor to the belt conveyor and a supply stop step of stopping the supply of the treatment liquid are repeatedly applied for a long period of time.

[0029] The concentrated belt conveyor lubricant composition of the present invention may further contain one or more components commonly used in the art, depending on the formulation of the concentrated conveyor lubricant composition, as long as the effects of the present invention are not impaired. Examples of such components include preservatives, metal corrosion inhibitors, pH adjusters, thickeners, etc. The formulation may be in the form of a liquid or solid (pellets, powder, etc.), but a liquid is preferred from the viewpoint of uniformity of component concentration.

[0030] Examples of preservatives include 2-methyl-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, etc. These may be used alone or in combination of two or more.

[0031] Examples of metal corrosion inhibitors include polycarboxylic acids such as short-chain dicarboxylic acids and tricarboxylic acids, triazoles such as benzotriazole, tolyltriazole, and mercaptobenzothiazole, and phosphonic acids such as 1-hydroxyethylidene-1,1-diphosphonic acid, etc. These may be used alone or in combination of two or more.

[0032] Examples of bases used as pH adjusters include sodium hydroxide, potassium hydroxide, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, etc., and preferably monoethanolamine, triethanolamine, and monoisopropanolamine. These may be used alone or in combination of two or more. Examples of acids used as pH adjusters include hydrochloric acid, acetic acid, propionic acid, lactic acid, malic acid, citric acid, benzoic acid, malonic acid, succinic acid, glutaric acid, adipic acid, gluconic acid, ethylenediaminetetraacetic acid, phosphonobutanetricarboxylic acid, and phosphoric acid, with preferred examples being acetic acid, citric acid, ethylenediaminetetraacetic acid, p-toluenesulfonic acid, xylenesulfonic acid, and cumenesulfonic acid. These may be used alone or in combination of two or more.

[0033] The concentrated belt conveyor lubricant composition of the present invention is preferably used after adjusting the pH to a range of 7.0 to 11.0 by adding a base component or an acid component, more preferably to a range of 8.5 to 10.0, and particularly preferably to a range of 9.0 to 10.0. If the pH of the treatment solution is less than 7.0, sufficient disinfecting properties and dilution stability may not be obtained. If the pH exceeds 11.0, the ability to suppress cracking and crazes in PET bottles may decrease, resulting in problems such as cracking and crazes in the PET bottles being transported. Examples of methods for adjusting the pH include a method in which an appropriate amount of the above-mentioned pH adjuster is incorporated into the concentrated belt conveyor lubricant composition of the present invention.

[0034] Next, the method for improving the lubricity of a belt conveyor of the present invention (hereinafter simply referred to as the method for improving the lubricity of the present invention) will be described. The concentrated belt conveyor lubricant composition of the present invention can reduce the coefficient of friction between the belt conveyor and the conveyed items by supplying a diluted solution (treatment solution) diluted with water to the belt conveyor and / or the conveyed items on the belt conveyor, thereby improving the lubricity of the belt conveyor. Methods for supplying the composition to the belt conveyor include a method of continuously or intermittently supplying a treatment solution in a low concentration range (hereinafter simply referred to as a low-concentration treatment solution) prepared by diluting the concentrated belt conveyor lubricant composition so that the (A) component concentration is 0.005% by mass or more and 0.1% by mass or less, and a method of continuously or intermittently supplying a treatment solution in a high concentration range (hereinafter simply referred to as a high-concentration treatment solution) prepared by diluting the concentrated belt conveyor lubricant composition so that the (A) component concentration is 0.04% by mass or more and 1% by mass or less. In the method of supplying a low concentration treatment liquid, the concentration of component (A) in the treatment liquid is preferably 0.007 to 0.08% by mass, more preferably 0.01 to 0.07% by mass. In the method of supplying a high-concentration treatment liquid, the concentration of component (A) in the treatment liquid is preferably 0.05% by mass or more and 0.8% by mass or less, and more preferably more than 0.1% by mass and 0.5% by mass or less.

[0035] The supplying means for supplying the treatment liquid to the belt conveyor includes dripping, coating, spraying, etc., but spraying is preferred when treating with a high concentration treatment liquid because it can supply a relatively small amount uniformly over a wide area without waste. When spraying is selected as the supplying means, a relatively small amount of the treatment liquid of the concentrated belt conveyor lubricant composition can be supplied uniformly over a wide area on the belt conveyor without waste. The form of spraying varies depending on the type of spray nozzle, but can be selected according to the application. For example, a known spray nozzle can be appropriately selected and used. An example of the spray nozzle is a one-fluid nozzle that sprays the treatment liquid by applying liquid pressure.

[0036] The orifice diameter of the liquid spray port of the spray nozzle is preferably 0.3 mm or more and 2.4 mm or less, more preferably 0.4 mm or more and 1.0 mm or less. The spray pressure is preferably 0.1 MPa or more and 2.5 MPa or less, more preferably 0.1 MPa or more and 1.0 MPa or less, and even more preferably 0.1 MPa or more and 0.3 MPa or less. The droplet size of the treatment liquid supplied from the spray nozzle is preferably 50 microns or more and 5,500 microns or less, but is more preferably 100 microns or more and 2,000 microns or less, as this allows the treatment liquid to be sprayed uniformly and prevents wear on the belt conveyor. The spray angle is preferably 30° or more and 150° or less, and more preferably 60° or more and 140° or less. The spray angle refers to the angle at which the sprayed liquid spreads. The spray rate of the treatment liquid per nozzle is preferably 10 mL / min or more and 100 mL / min or less, and more preferably 10 mL / min or more and 50 mL / min or less from the viewpoint of maintaining optimal lubrication. The spray shape varies depending on the type of spray nozzle, but any known type can be used depending on the application. Among them, hollow cone, full cone, flat spray, wide-angle spray, fine spray, solid spray, air atomizing spray, etc. are preferred. The treatment liquid can be sprayed and supplied onto a belt conveyor using these spray sols.

[0037] When processing with a low-concentration treatment solution, methods include continuous or intermittent supply of the low-concentration treatment solution at a flow rate of 10 to 150 mL / min by dripping, coating, etc., and continuous or intermittent spray supply by spraying at a flow rate of 10 to 150 mL / min. In the case of intermittent spray supply of the low-concentration treatment solution, it is preferable to continuously repeat a process of spraying the low-concentration treatment solution at 10 to 150 mL / min for about 20 to 120 seconds and then stopping the spray for about 30 to 120 seconds. In addition, in the case of intermittent supply, a short-term intermittent supply method in which the stop time is set to four times or less the supply time is preferable. If the stop time exceeds four times, there is a risk of a decrease in lubricity.

[0038] On the other hand, when treating with a high-concentration treatment solution, methods include continuously or intermittently supplying the high-concentration treatment solution at a flow rate of 10 to 100 mL / min by dripping, coating, etc. through a resin or SUS tube, or continuously or intermittently supplying it by spray at a flow rate of 10 to 50 mL / min. When supplying a high-concentration treatment solution, intermittent supply is preferred as it minimizes waste of the amount of chemical used, and intermittent spray supply is particularly preferred as it allows for uniform supply of the treatment solution.

[0039] When a high-concentration treatment liquid is supplied intermittently, a long-term intermittent supply method in which a stop time of 10 to 360 times the supply time is set is possible, but when a high-concentration treatment liquid is supplied by intermittent spraying, it is preferable to spray the high-concentration treatment liquid at a spray rate of about 10 to 100 mL / min for about 5 to 180 seconds, and then stop spraying for about 10 to 120 minutes, and repeat this process continuously. In intermittent spraying, lubricity is maintained even when spraying stops because the lubricant that was sprayed once remains on the belt conveyor.

[0040] For example, a specific first embodiment of the method for improving lubricity of the present invention is a method for improving lubricity in which a treatment liquid prepared using the concentrated lubricant composition for belt conveyors of the present invention so that the concentration of component (A) contained in the concentrated composition is in the range of 0.005 mass % or more and 0.1 mass % or less is continuously supplied onto a belt conveyor that transports an object to be transported. This method of treating a belt conveyor by continuous supply or continuous spray supply of a low-concentration treatment liquid can be applied to both stainless steel conveyors and plastic conveyors, but is particularly suitable for treating stainless steel conveyors and metal conveyors such as beverage filling machines, cappers, seamers, and can feed chains, as it prevents dirt that occurs when the liquid is mixed with the beverage from contaminating the conveyor.

[0041] A second specific embodiment of the method for improving lubricity of the present invention is a method for improving lubricity, which uses the concentrated lubricant composition for a belt conveyor of the present invention, and intermittently supplies a treatment liquid prepared so that the concentration of component (A) contained in the concentrated composition is in the range of 0.005 mass % or more and 0.1 mass % or less onto a belt conveyor that transports an object to be transported, so that the ratio of treatment liquid supply step time: treatment liquid supply stop step time is 10:1 to 1:4. This method of treatment using intermittent supply or intermittent spray supply of low-concentration treatment solution can be applied to both stainless steel conveyors and resin conveyors, but is particularly suitable for treating resin conveyors because their lubricity is not easily reduced even when supply is stopped for periods of time.

[0042] A third specific embodiment of the method for improving lubricity of the present invention is a method for improving lubricity, which uses a concentrated lubricant composition for a belt conveyor, and intermittently supplies a treatment liquid prepared so that the concentration of component (A) contained in the concentrated composition is in the range of 0.04 mass % or more and 1 mass % or less onto a belt conveyor that conveys an object to be conveyed and / or onto the object to be conveyed, such that the ratio of treatment liquid supply step time: treatment liquid supply stop time = 1:10 to 1:360. The third embodiment, which uses a high-concentration treatment solution and has a long treatment solution supply suspension period, is applicable to both stainless steel conveyors and resin conveyors, but is particularly suitable for treating resin conveyors because it can prevent contamination caused by wear powder generated on the conveyor. In the third embodiment, the concentration of the treatment liquid supplied is high, so the supply amount can be small, and therefore the amount of dilution water used can also be small. Therefore, the third embodiment is preferable from the viewpoint of water conservation. From the viewpoint of maintaining good lubricity and disinfecting properties even when the supply interval of the treatment liquid is long, in the third embodiment, the concentration of component (A) contained in the concentrated belt conveyor lubricant composition is preferably in the range of more than 0.1% by mass and not more than 1% by mass.

[0043] The concentrated belt conveyor lubricant composition used in the methods for improving lubricity of the first to third aspects may contain the components (A), (B), and (C) in a balanced manner, but the concentrated belt conveyor lubricant composition of the present invention has excellent storage stability and dilution stability, and can be easily handled in a concentrated state. Therefore, the method for improving lubricity of the present invention can suitably use a concentrated belt conveyor lubricant composition in which the component (A) is contained in an amount of 2% by mass or more and 10% by mass or less.

[0044] The shape, structure, material, etc. of the transported object are not particularly limited, but beverage containers are preferred, and examples thereof include plastic containers made of polyethylene terephthalate (PET), polyethylene, polypropylene, polystyrene, polyamide, polycarbonate, etc.; paper containers such as paper cartons (including wax-finished and resin-coated); metal containers made of iron, aluminum, tin, copper, zinc, or composite materials thereof; glass containers; ceramic containers, etc. Among these containers, iron or aluminum containers are preferred because the effects of the present invention are most pronounced. [Example]

[0045] The present invention will be described in more detail below with reference to examples. The components used in the concentrated belt conveyor lubricant compositions of the examples and comparative examples are shown in Tables 1 to 6 below. The numerical values ​​relating to the blending amounts shown in Tables 1 to 6 below are the ratio (mass %) of the pure content of each component to the concentrated belt conveyor lubricant composition, and in the following examples, "%" indicates mass % unless otherwise specified. The number following the C in parentheses indicates the number of carbon atoms in the alkyl or alkenyl group, EO stands for ethylene oxide, and PO stands for propylene oxide, and the numbers following it indicate the average number of moles added of EO and PO, respectively.

[0046] Component (A): Anionic surfactant A-1: Polyoxyethylene (EO 4 mol) alkyl (C6-10 mixed) ether phosphate ester monoethanolamine salt ("Phosphanol RA-600" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with monoethanolamine) A-2: Polyoxyethylene (EO 2 moles) alkyl (C12) ether phosphate ester monoethanolamine salt ("Phosphanol ML-220" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with monoethanolamine) A-3: Polyoxyethylene (EO 4 mol) alkyl (C12) ether phosphate ester monoethanolamine salt ("Phosphanol ML-240" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with monoethanolamine) A-4: Polyoxyethylene (EO 7 mol) alkyl (unsaturated C18) ether phosphate ester monoethanolamine salt (ADEKA Corporation's "ADEKACOL PS-807" completely neutralized with monoethanolamine) A-5: Polyoxyethylene (EO 4 mol) alkyl (unsaturated C18) ether phosphate ester monoethanolamine salt ("Phosphanol RB-410" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with monoethanolamine) A-6: Polyoxyethylene (EO 2 moles) alkyl (C12) ether phosphate ester triethanolamine salt ("Phosphanol ML-220" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with triethanolamine) A-7: Polyoxyethylene (EO 4 mol) alkyl (C12) ether phosphate ester monoisopropanolamine salt ("Phosphanol ML-240" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with monoisopropanolamine) The above-mentioned A-1 to A-7 are all anionic surfactants in which a compound in which m=1 and a compound in which m=2 are mixed in the above-mentioned general formula, and M1 is hydrogen.

[0047] (A) Comparative ingredient A'-1: Polyoxyethylene (EO 1 mol) alkyl (C4) ether phosphate ester monoethanolamine salt ("Phosphanol BH-650" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with monoethanolamine) A'-2: Alkyl (C12) ether phosphate ester monoethanolamine salt ("Phosphanol ML-200" manufactured by Toho Chemical Industry Co., Ltd., completely neutralized with monoethanolamine) A'-3: Polyoxyethylene (EO 10 mol) alkyl (C13) ether phosphate ester monoethanolamine salt (manufactured by Toho Chemical Industry Co., Ltd., "Phosphanol RS-710" completely neutralized with monoethanolamine)

[0048] (B) Component: Cationic surfactant B-1: Alkyl (C8-18 mixed) dimethylbenzyl ammonium chloride B-2: Didecyldimethylammonium chloride B-3: Didecyldimethylammonium methosulfate B-4: Dioctyldimethylammonium chloride B-5: Octyldecyldimethylammonium chloride B-6: Alkyldimethylhydroxyethylammonium chloride B-7: N,N-didecyl-N-methyl-polyoxyethyl-ammonium propionate

[0049] (C) Ingredient: L-glutamic acid diacetate C-1: Tetrasodium L-glutamate diacetate ("GLDA-4Na" manufactured by Showa Denko K.K.)

[0050] (C) Comparative ingredients C'-1: Trisodium methylglycine diacetate (BASF "Trilon M Liquid")

[0051] (D) Component: Water D-1: Tap water from Arakawa Ward, Tokyo (pH = 7.6, total alkalinity (calcium carbonate equivalent) 40.5 mg / L, German hardness 8.1°DH (including calcium hardness 6.3°DH and magnesium hardness 2.1°DH), chloride ions 21.9 mg / L, sodium and its compounds 13 mg / L, nitrate nitrogen and nitrite nitrogen 1.1 mg / L, fluorine and its compounds 0.09 mg / L, boron and its compounds 0.04 mg / L, total trihalomethanes 0.014 mg / L, residual chlorine 0.4 mg / L, organic matter (total organic carbon) 0.5 mg / L)

[0052] (E) Ingredient: Ethylenediaminetetraacetate E-1: Tetrasodium ethylenediaminetetraacetate ("Dissolvin E-39" manufactured by Nouryon Japan) E-2: Sodium diethylenetriaminepentaacetate ("Chilest P" manufactured by Chelest Co., Ltd.) E-3: Sodium triethylenetetramine hexaacetate ("Chilest Q" manufactured by Chelest Co., Ltd.) E-4: 1,3-propanediaminetetraacetic acid (Chelest PD-4H, manufactured by Chelest Co., Ltd.) E-5: 1,3-diamino-2-hydroxypropanetetraacetic acid ("Chelest RA" manufactured by Chelest Co., Ltd.)

[0053] (F) Component: Nonionic surfactant F-1: EO9 mole adduct of dodecyl alcohol (C12) F-2: EO9 mole adduct of octadecenyl alcohol (C18) F-3: EO 7 mole adduct of synthetic alcohol (C9-C11 mixture) F-4: Dodecyl alcohol (C12) adduct of 5 moles of EO and 3 moles of PO F-5: Dodecyl alcohol (C12) adduct of 12 moles of EO and 3 moles of PO

[0054] (G) Component: Polyol G-1: Glycerin G-2: Propylene glycol G-3: Polyethylene glycol with a molecular weight of 200 (EO 4 mole adduct)

[0055] (H) Other ingredients: Preservatives H-1: 1,2-Benzisothiazolin-3-one ("Acticide B20(N)" manufactured by Thor Japan Co., Ltd.)

[0056] (I) Other ingredients: pH adjuster I-1: Citric acid I-2: Monoethanolamine

[0057] Examples 1 to 48, Comparative Examples 1 to 8 Concentrated belt conveyor lubricant compositions were prepared using tap water from Arakawa Ward, Tokyo, according to the formulations shown in Tables 1 to 6, and were used to carry out the following tests and evaluations. The results are shown in Tables 1 to 6.

[0058] *1-1 Resin conveyor lubricity test The coefficient of dynamic friction between the resin conveyor and the bottle was measured by the following test method to evaluate the lubricating properties of the concentrated lubricant composition. Test Method: The concentrated belt conveyor lubricant composition was diluted to 0.5% by mass with tap water and continuously supplied for 5 minutes at a rate of 100 mL / min via a 6 mm inner diameter resin tube onto a 1.5 m long stainless steel conveyor at a belt speed of 30 m / min. After 5 minutes, a 350 mL aluminum can was placed on the belt conveyor while the supply was continuing, and the friction coefficient was measured and evaluated according to the following criteria. The friction coefficient was calculated using the following formula by connecting the container to a load measuring device and measuring the tensile load while the belt conveyor was running. [Formula 1] Friction coefficient (μ) = tensile load (g) / container weight (g) (1) Evaluation criteria: ○: Friction coefficient (μ) = 0.13 or more and less than 0.16 (good sliding). △: Friction coefficient (μ) = 0.16 or more and less than 0.20 (slides without problems). ×: Friction coefficient (μ) = 0.20 or more (poor slip). The products were judged as practical with ○ and △.

[0059] *1-2 Resin conveyor lubricity test The coefficient of dynamic friction between the resin conveyor and the bottle was measured by the following test method to evaluate the lubricating properties of the concentrated lubricant composition. Test Method: The concentrated belt conveyor lubricant composition was diluted to 5% by mass with tap water and sprayed for 20 seconds at a supply rate of 50 mL / min through a full-cone spray nozzle onto a 1.5 m long resin conveyor with a belt conveyor speed of 30 m / min. After that, a 350 mL aluminum can was placed on the belt conveyor, and the friction coefficient immediately after spraying (immediately after application) and the friction coefficient when dry 30 minutes after spraying (after drying) were measured and evaluated according to the following criteria. The friction coefficient was calculated by connecting the container to a load measuring device, measuring the tensile load value while the belt conveyor was running, and using the following formula: [Formula 2] Friction coefficient (μ) = tensile load (g) / container weight (g) (2) Evaluation criteria: ○: The friction coefficient (μ) was 0.08 or more and less than 0.11 (good slip) both immediately after spraying and 30 minutes after spraying. △: The friction coefficient (μ) value is 0.11 or more and less than 0.13 (slides without problems) either immediately after spraying or 30 minutes after spraying. ×: The friction coefficient (μ) value was 0.13 or more (poor slipperiness) or less than 0.08 (too slipperiness) both immediately after spraying and 30 minutes after spraying. The products were judged as practical with ○ and △.

[0060] *2 Stainless steel conveyor lubricity test The coefficient of dynamic friction between the stainless steel belt conveyor and the bottle was measured by the following test method to evaluate the lubricating properties of the lubricant concentrate composition. Test Method: The concentrated belt conveyor lubricant composition was diluted to 0.5% by mass with tap water and continuously supplied for 5 minutes at a rate of 100 mL / min via a 6 mm inner diameter resin tube onto a 1.5 m long stainless steel conveyor at a belt speed of 30 m / min. After 5 minutes, a 350 mL aluminum can was placed on the belt conveyor while the supply was continuing, and the friction coefficient was measured and evaluated according to the following criteria. The friction coefficient was calculated using the following formula by connecting the container to a load measuring device and measuring the tensile load while the belt conveyor was running. [Formula 3] Friction coefficient (μ) = tensile load (g) / container weight (g) (3) Evaluation criteria: ○: Friction coefficient (μ) = 0.13 or more and less than 0.16 (good sliding). △: Friction coefficient (μ) = 0.16 or more and less than 0.20 (slides without problems). ×: Friction coefficient (μ) = 0.20 or more (poor slip). The products were judged as practical with ○ and △.

[0061] *3 Storage stability test The concentrated belt conveyor lubricant compositions were subjected to stability tests and evaluated by the following method. Test Method: 100 g of each concentrated belt conveyor lubricant composition was placed in a transparent glass bottle and allowed to stand at 40° C. for one month, after which the appearance was observed and evaluated according to the following criteria. Evaluation criteria: ○: Transparent. ×: Turbidity, browning or precipitation occurs. The evaluation was made as being practical with ○.

[0062] *4 Diluted solution stability test The concentrated belt conveyor lubricant compositions were subjected to a stability test of the diluted solutions by the following method and evaluated. Test Method: 100 g of a 0.3% diluted solution of the concentrated belt conveyor lubricant composition was prepared using artificial hard water with a hardness of 50 ppm, placed in a transparent glass bottle, and left to stand overnight at room temperature. The appearance was then observed and evaluated according to the following criteria. Evaluation criteria: ○: Transparent. △: Cloudy but no precipitate. ×: Precipitation occurs. The products were judged as practical with ○ and △.

[0063] *5 Bacterial sterilization test The disinfecting properties of the concentrated belt conveyor lubricant compositions were tested and evaluated by the following method. Test Method: Pseudomonas aeruginosa (test strain: NBRC13736) was cultured in sterilized SCD medium at 37°C for 24 hours to obtain a bacterial solution with a 109 level of cfu / mL. 100 μL of the bacterial solution was added to 10 mL of an aqueous solution prepared by diluting the concentrated belt conveyor lubricant composition with pure water to 0.5% by mass, and the mixture was allowed to come into contact with the aqueous solution at 25°C for 15 minutes. 1 mL of this mixture was then pour-cultured on sterilized SCDLP agar medium, and the viable cell count was confirmed and evaluated according to the following criteria. Evaluation criteria: ○: Log reduction of the number of test bacteria is 6 or more. △: Log reduction of the test bacteria is 4 or more but less than 6. ×: Log reduction of the test bacteria is less than 4. The products were judged as practical with ○ and △.

[0064] *6 Bactericidal test against cationic surfactant-resistant bacteria The disinfecting ability of the concentrated belt conveyor lubricant composition against cationic surfactant-resistant bacteria was tested and evaluated by the following method. Test Method: The following test strains, cultured on SCD agar medium, were suspended in sterilized physiological saline to prepare a bacterial solution with a 10^8 level of cfu / mL. A concentrated belt conveyor lubricant composition that had been left standing at 40°C for one month was diluted with pure water to 0.5% by mass, and 300 μL of the bacterial solution was added to 30 mL of the aqueous solution. The mixture was allowed to come into contact with the composition for 7 days at 25°C. 1 mL of the resulting solution was then pour cultured on SCD agar medium, and the viable bacterial count was determined and evaluated according to the following criteria. The dilution water used was artificial hard water with a hardness of 50 ppm. Test strains: The cationic surfactant-resistant strain of Serratia marcescens, which was isolated and identified in a food factory, was used. Evaluation criteria: ○: Log reduction of test bacteria is 6 or more △: Log reduction of test bacteria is 4 or more and less than 6 ×: Log reduction of test bacteria is less than 4 The products were judged as practical with ○ and △.

[0065] *7 Beverage mixability test The beverage mixability of the belt conveyor lubricant concentrate compositions was tested and evaluated by the following method. Test Method: 50 mL of an aqueous solution prepared by diluting the concentrated belt conveyor lubricant composition with tap water to 0.5% by mass was mixed with 50 mL of commercially available beer in a 100 mL glass sample bottle, and the mixture was allowed to stand at room temperature for 5 hours. The appearance of the mixture and the condition of the bottom of the sample bottle were then visually evaluated according to the following criteria. Beverage Mixability Evaluation Criteria: ○: The mixture is clear and free of precipitate. △: The mixture is cloudy but there is no precipitate. ×: Precipitate is observed. The products were judged as practical with ○ and △.

[0066] [Table 1]

[0067] [Table 2]

[0068] [Table 3]

[0069] [Table 4]

[0070]

Table 5

[0071]

Table 6

Claims

1. As the component (A), an anionic surfactant represented by the following general formula (1): 【Chemical formula 1】 (In the formula, R １ is a hydrocarbon group having 6 to 18 carbon atoms which may have an oxygen atom or a nitrogen atom, n is the average number of moles of ethylene oxide added, n=2 to 7, m is 1 or 2, M １ is hydrogen, alkali metals, amines, NH ４ Either a cationic surfactant as component (B); (C) L-glutamic acid diacetate as component; (D) Water as a component; Contains A concentrated lubricant composition for a belt conveyor, characterized in that the mass ratio (B) / (C) of component (B) to component (C) is 0.14 or more and 2.50 or less.

2. 2. The concentrated antibacterial lubricant composition for belt conveyors according to claim 1, wherein the cationic surfactant of component (B) is at least one selected from the group consisting of alkyl dimethyl benzyl ammonium chloride, didecyl dimethyl ammonium chloride, didecyl dimethyl ammonium methosulfate, dioctyl dimethyl ammonium chloride, octyl decyl dimethyl ammonium chloride, alkyl dimethyl hydroxyethyl ammonium chloride, and N,N-didecyl-N-methyl-polyoxyethyl-ammonium propionate.

3. 3. The concentrated lubricant composition for a belt conveyor according to claim 1, further comprising, as component (E), at least one selected from the group consisting of ethylenediaminetetraacetate, diethylenetriaminepentaacetate, triethylenetetraaminehexaacetate, 1,3-propanediaminetetraacetate, and 1,3-diamino-2-hydroxypropanetetraacetate.

4. 4. The belt conveyor lubricant concentrated composition according to claim 1, further comprising, as component (F), 1 mass % or more and 6 mass % or less of a nonionic surfactant produced by adding an alkylene oxide to an aliphatic alcohol having a hydrocarbon group with 9 to 18 carbon atoms.

5. 5. The belt conveyor lubricant concentrated composition according to claim 1, further comprising, as component (G), 20% by mass or more and 45% by mass or less of at least one polyol selected from glycerin, propylene glycol, and polyethylene glycol.

6. 6. The concentrated lubricant composition for a belt conveyor according to claim 1, wherein the pH of the composition at 25°C is 7.0 or more and 11.0 or less.

7. The method of claim 1, wherein the concentrated belt conveyor lubricant composition is used. A method for improving the lubricity of a belt conveyor, comprising continuously supplying a treatment liquid prepared so that the concentration of component (A) contained in the concentrated belt conveyor lubricant composition is in the range of 0.005 mass % or more and 0.1 mass % or less onto the belt conveyor that transports the transported material.

8. The method of claim 1, wherein the concentrated belt conveyor lubricant composition is used. A method for improving the lubricity of a belt conveyor, comprising intermittently supplying a treatment liquid, which is prepared so that the concentration of component (A) contained in the concentrated belt conveyor lubricant composition is in the range of 0.005 mass % or more and 0.1 mass % or less, onto a belt conveyor that conveys an object to be conveyed, such that the ratio of treatment liquid supply step time: treatment liquid supply stop step time is 10:1 to 1:

4.

9. The method of claim 1, wherein the concentrated belt conveyor lubricant composition is used. A method for improving the lubricity of a belt conveyor, comprising intermittently supplying a treatment liquid, which is prepared so that the concentration of component (A) contained in the concentrated belt conveyor lubricant composition is in the range of 0.04 mass % or more and 1 mass % or less, onto a belt conveyor that transports an object to be transported and / or onto the object to be transported, such that the ratio of treatment liquid supply step time: treatment liquid supply stop time is 1:10 to 1:

360.

10. The method for improving the lubricity of a belt conveyor according to any one of claims 7 to 9, wherein the belt conveyor is a resin conveyor.

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