Lubricant composition for belt conveyor and method for improving lubricity of belt conveyor

Abstract

To provide a lubricant composition for a belt conveyor having excellent lubricity and water resistance, little dust contamination due to wear, and excellent dust contamination removability, and a method for improving the lubricity of the belt conveyor.SOLUTION: A composition comprises: (A) a nonionic surfactant having an HLB of 6 or more and 10 or less produced by adding ethylene oxide to an aliphatic alcohol having a hydrocarbon group of 18 to 24 carbons; (B) a nonionic surfactant having an HLB of 12 or more and 18.5 or less produced by adding ethylene oxide to an aliphatic alcohol having a hydrocarbon group of 12 to 24 carbons; (C) a liquid hydrocarbon oil at 20°C selected from liquid paraffin and / or polyalphaolefin; (D) a solid hydrocarbon at 20°C selected from docosane and / or hydrocarbon-based wax; (E) a polyol selected from glycerin and / or polyalkylene glycol; (F) at least one or more kinds of specific diol; and (G) an oil-in-water emulsion containing water.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a lubricant composition for a belt conveyor and a method for improving the lubricity of a belt conveyor using the lubricant composition for a belt conveyor. More specifically, the present invention relates to a lubricant composition for a belt conveyor used when moving and conveying plastic containers, paper containers, metal containers, glass containers, ceramic containers, and the like in a 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] As the containers for the beverages and foods, plastic containers such as polyethylene terephthalate, paper containers, metal containers, glass containers, ceramic containers, etc. are used. In the process of filling these containers and the process of packaging them in beverage manufacturing factories, belt conveyors are generally used to continuously move and transport a large number of containers. In such factories, it is common to operate the belt conveyor continuously to transport the containers and other transported objects at high speed. At this time, friction generated between the containers or between the container and the belt conveyor may cause deformation of the container or the container to fall over, etc. In order to prevent such problems, it is common to apply or spray a belt conveyor lubricant onto the belt conveyor to reduce the coefficient of friction between the containers and the transported objects and the belt conveyor.

[0003] Conventional belt conveyor lubricants generally use an aqueous solution of a surfactant, but they need to be supplied to the conveyor surface continuously or with short intermittent stop times during use, which causes a problem of large amounts of lubricant being used. In recent years, lubricant compositions have been developed that maintain lubricity for a long time after application to the conveyor, allowing for longer intermittent stop times and reduced amounts of lubricant used. For example, Patent Document 1 discloses a method for lubricating a container conveyor surface, which includes forming a lubricant coating containing at least about 70% by weight of wax on at least a part of the conveyor surface.

[0004] Patent Document 2 discloses a lubrication method using a lubricant composition containing a synthetic wax emulsion including an ethylene-based or propylene-based wax emulsion, an amine derivative including an aliphatic amine or an ether amine, an emulsifier, and a metal ion sequestering agent, and the application cycle includes a first period during which the lubricant composition is distributed for 1 to 60 seconds and a second period during which the lubricant composition is not distributed for 10 to 3600 seconds.

[0005] Patent Document 3 discloses a lubricant composition for belt conveyors, which comprises an oil-in-water emulsion containing as component (A) a nonionic surfactant consisting of an alkylene oxide adduct of an aliphatic alcohol having a hydrocarbon group with 12 to 32 carbon atoms, as component (B) an oily substance, as component (C) one or more polyols selected from glycerin and polyalkylene glycols, as component (D) a cationic surfactant, and as component (E) water, wherein the mass ratio (B) / (A) of component (A) to component (B) is 2 or more and 7 or less, the mass ratio (C) / (A) of component (A) to component (C) is 1 or more and 20 or less, and the mass ratio (D) / (A) of component (A) to component (D) is 0.05 or more and 1 or less. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special table number 2008-518045 [Patent Document 2] Patent No. 6883104 [Patent Document 3] Patent No. 6762792 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the lubricant composition for belt conveyor mainly composed of wax described in Patent Documents 1 and 2 does not have satisfactory lubricity, and furthermore, there is a problem that a mixture of the lubricant composition for belt conveyor and dust generated by wear of the belt conveyor accumulates on the surface and joints of the belt conveyor, and the dirt is rubbed off by the conveyed container, adheres to the bottom of the container, and contaminates the container. In addition, the lubricant for belt conveyor described in Patent Document 3 can provide excellent lubricity for a relatively long time with a small amount of use, and further, dust dirt caused by wear is less likely to occur, and even if dust dirt occurs, it is excellent in removability, but there is a problem that the lubricating performance of the lubricant composition for belt conveyor supplied is reduced when the belt conveyor is wet with water.

[0008] Therefore, an object of the present invention is to provide a lubricant composition for belt conveyors which has excellent lubricity and water resistance even when used in a small amount, generates little dust staining due to wear when applied to a belt conveyor, and even if dust staining does occur, is easily removable by washing with water and can suppress a decrease in lubricity, and a method for improving the lubricity of a belt conveyor using the same. [Means for solving the problem]

[0009] In order to solve the above problems, the present inventors have conducted intensive studies and have found that the present invention provides a surfactant that is capable of dissolving a nonionic surfactant having an HLB of 6 or more and 10 or less, which is produced by adding ethylene oxide to an aliphatic alcohol having a hydrocarbon group with 18 to 24 carbon atoms, (B) a nonionic surfactant having an HLB of 12 or more and 18.5 or less, which is produced by adding ethylene oxide to an aliphatic alcohol having a hydrocarbon group with 12 to 24 carbon atoms, (C) a hydrocarbon oil that is liquid at 20° C. selected from liquid paraffin and / or polyalphaolefin, (D) a hydrocarbon that is solid at 20° C. selected from docosane and / or a hydrocarbon wax, and (E) a polyalkylene glycol selected from glycerin and / or polyalkylene glycol. The inventors have surprisingly found that by using a belt conveyor lubricant composition comprising an oil-in-water emulsion containing (F) a triol (excluding diols), at least one diol selected from ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, and hexylene glycol, and (G) water, the composition has excellent storage stability, excellent lubricity even when used in a small amount, little generation of dust stains due to wear when applied to a belt conveyor, and further has excellent water resistance such that the composition exhibits good lubricity even in a conveyor that is constantly wet with a large amount of water and is less likely to decrease in lubricity, and thus the present invention has been completed.

[0010] That is, the present invention is (1) (A) a nonionic surfactant having an HLB value of 6 or more and 10 or less, which is produced by adding ethylene oxide to an aliphatic alcohol having a hydrocarbon group with 18 to 24 carbon atoms as a component; (B) a nonionic surfactant having an HLB value of 12 or more and 18.5 or less, which is produced by adding ethylene oxide to an aliphatic alcohol having 12 to 24 carbon atoms in the hydrocarbon group; (C) a hydrocarbon oil that is liquid at 20°C selected from liquid paraffin and / or polyalphaolefin; (D) a hydrocarbon that is solid at 20°C and is selected from docosane and / or a hydrocarbon wax as a component; (E) a polyol selected from glycerin and / or polyalkylene glycol (excluding diols); (F) at least one diol selected from ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, and hexylene glycol; (G) Water as an ingredient; A lubricant composition for a belt conveyor, comprising an oil-in-water emulsion comprising: (2) The lubricant composition for a belt conveyor according to the above (1), in which the weight ratio (A) / (B) of the component (A) to the component (B) is 0.25 or more and 9 or less, the weight ratio (C) / (D) of the component (C) to the component (D) is 0.25 or more and 19 or less, and the weight ratio (C+D) / (A+B) of the sum of the component (C) and the component (D) to the sum of the component (A) and the component (B) is 2 or more and 10 or less. (3) A lubricant composition for a belt conveyor according to any one of (1) or (2) above, which contains, as a component (H), at least one disinfecting cationic surfactant selected from dioctyldimethylammonium salts, octyldecyldimethylammonium salts, didecyldimethylammonium salts, benzalkonium chloride, benzethonium chloride, dodecyltrimethylammonium salts, tetradecyltrimethylammonium salts, hexadecyltrimethylammonium salts, cetylpyridinium chloride, and didecylmethylpolyoxyethyleneammonium salts; (4) The belt conveyor lubricant composition according to (3) above, which contains, as component (I), at least one preservative selected from 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one; (5) A method for improving the lubricity of a belt conveyor, comprising supplying a treatment liquid containing the components (C) and (D) in the belt conveyor lubricant composition described in (1) above such that the total amount (C+D) of the components (C) and (D) is 0.1 mass % or more and 2 mass % or less onto a belt conveyor that conveys an article and / or onto a surface of the article. Effect of the Invention

[0011] The belt conveyor lubricant composition of the present invention has excellent storage stability and lubricity, and after the belt conveyor lubricant composition of the present invention is supplied to a conveyor, it can maintain excellent lubricity for a long time and also shows very excellent water resistance, so that even if water is brought into the conveying surface of the belt conveyor, the lubricity is not easily reduced and the amount of use can be reduced. In addition, the problem of the conveyor chain surface being scraped off due to wear and dust being generated is suppressed. Furthermore, according to the present invention, even if dust is generated on the conveying surface, the dust is well dispersed and is not easily lumped due to the presence of the belt conveyor lubricant composition of the present invention, so that the dust can be easily removed by washing with water. The method for improving the lubricity of a belt conveyor of the present invention can enjoy the excellent effects of the belt conveyor lubricant composition of the present invention described above, and can improve the lubricity of a belt conveyor used for conveying containers of food and beverage products, etc. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The nonionic surfactant of component (A) in the belt conveyor lubricant composition of the present invention (hereinafter sometimes simply referred to as the "lubricant composition") is a compound represented by the following general formula (1).

[0013] [C1] R1-O-(CH2CH2O)mH (1)

[0014] In the formula, R1 represents an aliphatic hydrocarbon group of 18 to 24, and specific examples thereof include an octadecyl group, an octadecenyl group, an isooctadecyl group, a docosyl group, an octyldodecyl group, and a decyltetradecyl group. Among these, the docosyl group, the octyldodecyl group, and the decyltetradecyl group are preferred because they provide excellent stability of the obtained oil-in-water emulsion, and excellent lubricity and water resistance. The docosyl group and the decyltetradecyl group are more preferred, and the docosyl group is particularly preferred. m is the average number of moles of ethyleneoxy groups added, and the degree of polymerization is preferably 3 moles or more and 10 moles or less, and more preferably 5 moles or more and 10 moles or less. If the degree of polymerization is less than 3 moles, the storage stability of the lubricant composition may decrease, and if the degree of polymerization is more than 10 moles, the water resistance decreases.

[0015] The nonionic surfactant of component (A) preferably has an HLB value of 6 or more and 10 or less, and more preferably 7 or more and 9 or less. If the HLB value is less than 6, the stability of the lubricant composition may decrease, and if it exceeds 10, the water resistance decreases. The HLB value of the nonionic surfactant of component (A) can be calculated by the following formula. Formula: HLB = (molecular weight of hydrophilic group part ÷ molecular weight of surfactant) × 100 / 5

[0016] For the nonionic surfactant (A), you can refer to the data published by the manufacturer. For example, the product names of Nippon Emulsion are EMALEX603 (HLB6), EMALEX605 (HLB8), EMALEX606 (HLB8), EMALEX608 (HLB10), EMALEX BHA-5 (HLB7), BHA-10 (HLB10), EMALEX OD-5 (HLB7), EMALEX OD-10 (HLB10), EMALEX1805 (HLB8), EMALEX2405 (HLB6), EMALEX2410 (HLB9); Kao product names are Emulgen 306P (HLB9.4), Emulgen 404 (HLB8.8), Emulgen 408 (HLB10.0); and Aoki Oil Industry product names are BROWNON EN-1504 (HLB7.9), BROWNON EN-905 (HLB8.9), and other nonionic surfactants can be used.

[0017] The nonionic surfactant of component (B) in the lubricant composition of the present invention is a compound represented by the following general formula (2).

[0018] [C2] R1-O-(CH2CH2O)mH (2)

[0019] In the formula, R1 represents an aliphatic hydrocarbon group having an integer of 12 to 24, and specific examples thereof include a dodecyl group, a tridecyl group, a tetradecyl group, a hexadecyl group, an octadecyl group, an octadecenyl group, an isooctadecyl group, a docosyl group, an octyldodecyl group, a decyltetradecyl group, etc. Among these, a hexadecyl group, an octadecyl group, an octadecenyl group, an isooctadecyl group, a docosyl group, an octyldodecyl group, a decyltetradecyl group, etc. are preferred, a docosyl group, an octyldodecyl group, and a decyltetradecyl group are more preferred, and an octyldodecyl group and a decyltetradecyl group are particularly preferred, because they provide excellent stability of the obtained oil-in-water emulsion, and excellent lubricity and water resistance. m is the average number of moles of ethyleneoxy groups added, and the degree of polymerization is preferably 13 moles or more and 60 moles or less, more preferably 15 moles or more and 40 moles or less, and particularly preferably 20 moles or more and 30 moles or less. If the degree of polymerization is less than 13 moles, the stability of the lubricant composition may decrease, and if the degree of polymerization exceeds 60 moles, the freezing point of the raw material itself becomes high, which may decrease the handleability and make production difficult.

[0020] The nonionic surfactant of component (B) preferably has an HLB value of 12 or more and 18.5 or less, and more preferably 13 or more and 16 or less. If the HLB value is less than 12, the stability of the lubricant composition may decrease, and if it exceeds 18.5, the water resistance decreases. The HLB value of the nonionic surfactant of component (B) can be calculated by the following formula. Formula: HLB = (molecular weight of hydrophilic group part ÷ molecular weight of surfactant) × 100 / 5

[0021] For the nonionic surfactant (B), you can refer to the data published by the manufacturer. For example, the product names of Nippon Emulsion are EMALEX BHA-20 (HLB13), EMALEX BHA-30 (HLB14), EMALEX620 (HLB13), EMALEX OD-20 (HLB13), EMALEX OD-25 (HLB14), EMALEX2420 (HLB12), EMALEX2425 (HLB13), EMALEX730 (HLB16), EMALEX750 (HLB17), EMALEX120 (HLB14), EMALEX125 (HLB15), EMALEX1825 (HLB14), and Kao product names are Emulgen 320P (HLB13.9), Emulgen 350 (HLB17.8), Emulgen 409PV (HLB12.0), Emulgen 420 (HLB13.6), Emulgen 430 (HLB16.2), Emulgen 2020G-HA (HLB13.0), Emulgen 2025G (HLB1 5.7), and nonionic surfactants manufactured by Aoki Oil Industries Co., Ltd. under the trade names Braunon EN-914 (HLB 14.0), Braunon EN-920PL (HLB 15.3), Braunon EN-1509 (HLB 12.1), Braunon EN-1511 (HLB 12.4), Braunon EN-1513.5 (HLB 13.6), Braunon EN-1530 (HLB 16.5), Braunon EN-1560 (HLB 18.2), Braunon SR-720 (HLB 15.2), Braunon SR-730 (HLB 16.6), Braunon BE-20 (HLB 14.6), and Braunon BE-30 (HLB 16.1) are examples.

[0022] The blending ratio of components (A) and (B) in the lubricant composition of the present invention, expressed as (A) / (B), is preferably from 0.25 to 9, more preferably from 0.5 to 6, and particularly preferably from 1 to 4. If (A) / (B) is less than 0.25, water resistance decreases, and if it exceeds 9, the cleanability against dust stains and storage stability decrease.

[0023] The component (C) in the lubricant composition of the present invention is a hydrocarbon oil that is liquid at 20° C. and is selected from liquid paraffin and / or polyalphaolefin. The liquid paraffin and polyalphaolefin may be used alone or in combination. As the polyalphaolefin, a hydrocarbon oil having a viscosity of 5 mm at 40° C. or less is preferable. 2 / s or more, 50mm 2 / s or less is preferable, and 5 mm 2 / s or more, 20mm 2 / s or less, more preferably 5 mm 2 / s or more, 8mm 2 / s or less. Viscosity is 5mm 2 If it is less than 50 mm / s, the lubricity and water resistance when dry may decrease, which is not preferable. 2 If the viscosity exceeds 1 / s, the lubricity decreases, which is undesirable. Examples of such polyalphaolefins include polyalphaolefins manufactured by Chevron Phillips under the trade names Synfloid PAO 2cSt, Synfloid PAO 2.5cSt, Synfloid PAO 4cSt, and Synfloid PAO 5cSt.

[0024] In addition, the liquid paraffin (C) has a viscosity of 4 mm at 37.8°C. 2 / s or more, 40mm 2 / s or less is preferable, and 4mm 2 / s or more, 20mm 2 / s or less is preferable, and 4mm 2 / s or more, 10mm 2 / s or less is particularly preferable. 2 If it is less than 40 mm / s, the lubrication and water resistance when dry may decrease, which is not preferable. 2 If the viscosity exceeds 1 / s, the lubricity decreases, which is not preferable. Examples of such liquid paraffins include liquid paraffins manufactured by Kaneda Co., Ltd. under the trade names of Hicol K-140N, Hicol K-160N, Hicol K-230N, and Hicol K-290N. The viscosity is measured based on the standard of ASTM D7042.

[0025] The component (D) in the lubricant composition of the present invention is a hydrocarbon that is solid at 20°C and is selected from docosane and / or a hydrocarbon wax. Docosane and the hydrocarbon wax may be used alone or in combination. As the hydrocarbon wax, paraffin wax, Fischer-Tropsch wax, polyethylene wax, etc. are preferred, and paraffin wax and Fischer-Tropsch wax, which are mainly composed of linear hydrocarbons, are preferred because of their excellent lubricity. The hydrocarbon wax preferably has a melting point of 70°C or less, more preferably 60°C or less, and even more preferably 55°C or less. Examples of such hydrocarbon waxes include hydrocarbon waxes such as Paraffin Wax-115, Paraffin Wax-120, Paraffin Wax-125, and HNP-3 manufactured by Nippon Seiro Co., Ltd., and KH PARAFFIN WAX F48N manufactured by KING HONOR Co., Ltd.

[0026] The blending ratio of components (C) and (D) in the lubricant composition of the present invention, expressed as (C) / (D), is preferably from 0.25 to 19, more preferably from 0.5 to 10, and particularly preferably from 1 to 4. If (C) / (D) is less than 0.25, the lubricity, anti-wear properties of the belt conveyor, and cleanability of dust stains decrease, while if it exceeds 19, the lubricity and water resistance decrease.

[0027] In the lubricant composition of the present invention, the weight ratio (C+D) / (A+B) of the total of components (C) and (D) to the total of components (A) and (B) is preferably from 2 to 10, more preferably from 3 to 7, and particularly preferably from 4 to 6. If (C+D) / (A+B) is less than 2, the lubricity and water resistance decrease, and if it exceeds 10, the storage stability and dust-stain cleanability decrease.

[0028] The component (E) in the lubricant composition of the present invention is a polyol selected from glycerin and / or polyalkylene glycol, except for diols. Glycerin and polyalkylene glycol may be used alone or in combination. As the polyalkylene glycol, polyethylene glycol is preferred because of its excellent lubricity and storage stability. The molecular weight of polyethylene glycol is preferably 200 to 600, more preferably 200 to 400, and particularly preferably 200 to 300. If the molecular weight of polyethylene glycol is less than 200, storage stability may decrease, and if it exceeds 600, lubricity and anti-wear properties of the belt conveyor may decrease.

[0029] The component (F) in the lubricant composition of the present invention is at least one diol selected from ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, and hexylene glycol. These may be used alone or in combination of two or more. As the diol of the component (F), propylene glycol and butylene glycol are preferred because of their excellent storage stability. By blending the component (F) in the lubricant composition of the present invention, the storage stability can be further improved.

[0030] The water of the component (G) in the lubricant composition of the present invention 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, organic matter (total organic carbon) 0.7 mg / L).

[0031] In the lubricant composition of the present invention, the content of component (A) is preferably 0.002% by mass or more and 0.9% by mass or less, the content of component (B) is preferably 0.001% by mass or more and 0.8% by mass or less, the content of component (C) is preferably 0.02% by mass or more and 1.9% by mass or less, the content of component (D) is preferably 0.005% by mass or more and 1.6% by mass or less, the content of component (E) is preferably 0.01% by mass or more and 1% by mass or less, the content of component (F) is preferably 0.008% by mass or more and 1% by mass or less, and component (G) represents the remainder.

[0032] The lubricant composition of the present invention is an oil-in-water type emulsion. The belt conveyor lubricant composition of the present invention can be obtained by a method in which the (A), (B), (C), (D), (E), (F), and (G) components are all mixed together, and then an emulsion is prepared using a high-pressure emulsifying machine such as a homogenizer or a colloid mill. Alternatively, the (A), (B), (C), (D), and (E) components are melted by heating and mixing at 50°C or higher and 80°C or lower, and then the (G) component is added and stirred at a stirring speed of 50 to 1000 RPM using a stirring blade such as a paddle type or a propeller type so that the mass ratio (G) / (E) of the (G) component to the (E) component is in the range of 0.25 to 1.5, and then the (F) component is added and mixed and stirred, and then the remaining (G) component is added to prepare an emulsion. This latter method can be used to easily prepare an emulsion, so it is preferable to use this method.

[0033] The cationic surfactant of the component (H) in the lubricant composition of the present invention is at least one selected from dioctyldimethylammonium salt, octyldecyldimethylammonium salt, didecyldimethylammonium salt, benzalkonium chloride, benzethonium chloride, dodecyltrimethylammonium salt, tetradecyltrimethylammonium salt, hexadecyltrimethylammonium salt, cetylpyridinium chloride, and didecylmethylpolyoxyethyleneammonium salt, and is blended as a bactericide. These may be used alone or in combination. From the viewpoint of excellent bactericidal properties, dioctyldimethylammonium salt, octyldecyldimethylammonium salt, didecyldimethylammonium salt, benzalkonium chloride, dodecyltrimethylammonium salt, and hexadecyltrimethylammonium salt are preferred, and dioctyldimethylammonium salt, octyldecyldimethylammonium salt, didecyldimethylammonium salt, and benzalkonium chloride are more preferred. In addition, the component (H) is particularly preferably a chloride salt in terms of its salt form, from the viewpoint of excellent compatibility with carbonated PET bottles.

[0034] The content of component (H) blended in the lubricant composition of the present invention is preferably 0.005% by mass or more and 1% by mass or less, more preferably 0.01% by mass or more and 1% by mass or less, and particularly preferably 0.01% by mass or more and 0.5% by mass or less, from the viewpoints of bactericidal properties, storage stability, lubricity, and water resistance. If the content of component (H) is less than 0.005% by mass, the bactericidal properties are insufficient, and if it exceeds 1% by mass, the storage stability, lubricity, and water resistance are reduced.

[0035] The lubricant composition of the present invention preferably further contains at least one preservative selected from 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one as component (I). These may be used alone or in combination. By adding component (I) to the lubricant composition of the present invention, in addition to the disinfecting properties against general bacteria, the composition exhibits excellent disinfecting properties against bacteria species that are resistant to the cationic surfactant of component (H) (hereinafter, sometimes simply referred to as "cationic surfactant-resistant bacteria").

[0036] The content of component (I) in the lubricant composition of the present invention is preferably 0.005% by mass or more and 0.2% by mass or less, more preferably 0.01% by mass or more and 0.1% by mass or less, and particularly preferably 0.01% by mass or more and 0.05% by mass or less, from the viewpoints of bactericidal properties, storage stability, lubricity, and water resistance. If the content of component (I) is less than 0.005% by mass, the bactericidal properties against cationic surfactant-resistant bacteria are insufficient, and if the content exceeds 0.2% by mass, the effect becomes saturated, making it difficult to obtain economic benefits.

[0037] The lubricant composition of the present invention may further contain any known lubricant additives, and depending on the intended use, a chelating agent, a surfactant other than components (A), (B) and (H), and the like may be blended within a range that does not impair the effects of the present invention.

[0038] Surfactants that can be optionally further blended in the lubricant composition of the present invention include nonionic surfactants and anionic surfactants other than the components (A) and (B). Examples of such surfactants include polyoxyalkylene alkyl ether acetic acid and its salts, polyoxyalkylene alkyl ether phosphate and its salts, alkylaminopropionate, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene sorbitol fatty acid ester, polyoxyalkylene glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyalkylene alkylamide, polyoxyalkylene castor oil, polyoxyalkylene hydrogenated castor oil, polyoxyalkylene lanolin ether, acetylene glycol ethylene oxide (EO; ethylene oxide) adduct, alkyldimethylamine oxide, polyoxyalkylene dimethylpolysiloxane copolymer, etc. The polyoxyalkylene group in the above compound includes a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group, and one or more polycondensates of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, etc. These surfactants may be used alone or in combination of two or more.

[0039] Examples of chelating agents that can be incorporated into the lubricant composition of the present invention include ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), hydroxyethylenediaminetriacetic acid (HEDTA), diethylenetriaminopentaacetic acid (DTPA), triethylenetetraaminehexaacetic acid (TTHA), hydroxyethyliminodiacetic acid (HIDA), etc. Other examples of chelating agents include amino acid-based chelating agents such as dihydroxyethylglucine (DHEG), methylglycine diacetate (MGDA), glutamic acid diacetate (GLDA), aspartic acid diacetate (ASDA), β-alanine diacetate (ADA), serine diacetate (SDA), glycine, alanine, glutamic acid, and aspartic acid. Other examples of chelating agents include glycolic acid, lactic acid, citric acid, gluconic acid, tartaric acid, malic acid, etc. Other examples of chelating agents include alkali metal salts, ammonium salts, and alkanolamine salts such as monoethanolamine, triethanolamine, and monoisopropanolamine of the above-mentioned compounds. The above-mentioned chelating agents may be used alone or in combination of two or more.

[0040] The lubricant composition of the present invention can be used as it is as a treatment liquid for improving the lubricity of a belt conveyor, but it can also be provided as a concentrate and used by diluting with water to prepare a treatment liquid when improving the lubricity of a belt conveyor. When provided as a concentrate, the total content (C+D) of the (C) component and the (D) component in the lubricant composition of the present invention is preferably 1% by mass or more and 30% by mass or less. If it is less than 1% by mass, the concentration is low, so the transportation cost increases, making it difficult to obtain economic benefits, and if it is blended in more than 30% by mass, the stability of the lubricant composition may decrease. When the belt conveyor lubricant composition is a concentrate, the total content in the lubricant composition of all components other than water, i.e., components (A), (B), (C), (D), (E), and (F) other than water, and components (H) and (I) which are added as necessary, is preferably 2 mass% or more and 70 mass% or less, more preferably 10 mass% or more and 50 mass% or less, and particularly preferably 15 mass% or more and 30 mass% or less, with the remainder being water.

[0041] Next, the method for improving the lubricity of a belt conveyor of the present invention (hereinafter, sometimes simply referred to as the "lubricity improvement method") will be described. In the method for improving lubricity of the present invention, when supplying a treatment liquid onto the belt conveyor and / or the surface of the conveyed product, it is preferable to use a treatment liquid in which the content of the component (A) in the belt conveyor lubricant composition of the present invention is 0.002 mass% or more and 0.9 mass% or less. A more preferable range of the content of the component (A) is 0.01 mass% or more and 0.5 mass% or less, and particularly preferably 0.03 mass% or more and 0.2 mass% or less. In addition, with regard to the content of the components (C) and (D), it is preferable to use a treatment liquid in which the total content (C+D) of the components (C) and (D) is 0.1 mass% or more and 2 mass% or less. As a result, the method for improving lubricity of the present invention enjoys various effects of the above-mentioned belt conveyor lubricant composition of the present invention, and enables the conveyed product to be conveyed well by the belt conveyor. In this embodiment, the "surface of the transported product" refers to the top, side and bottom surfaces of the transported product, in other words, all surfaces that appear on the outer surface. When the lubricant composition is supplied to the surface of the transported product, it may be supplied to a part or the entirety of the surface.

[0042] In the method for improving lubricity of the present invention, the method of supplying the belt conveyor lubricant composition onto the belt conveyor and / or the surface of the conveyed product is not particularly limited, and for example, the belt conveyor lubricant composition can be applied, dropped, or supplied as a continuous fluid, or sprayed. When the total content (C+D) of the (C) component and the (D) component in the belt conveyor lubricant composition is 0.1 mass% or more and 2 mass% or less, the original solution is used as it is as the treatment liquid, and when the content of (C+D) is a concentrate or the like exceeding 2 mass%, it is preferable to use the solution diluted with water or the like as the treatment liquid. When the content of (C+D) in the treatment liquid described above is less than 0.1 mass%, the lubricity is reduced, and when it exceeds 2 mass%, the cleanability of dust stains is reduced.

[0043] Methods for improving the lubricity of the belt conveyor of the present invention include a method of applying a treatment liquid prepared so that the total content of the (C) component and the (D) component (C+D) is 0.1 mass % or more and 2 mass % or less onto the belt conveyor and / or the surface of the transported product using a brush, a method of dripping or continuously supplying the treatment liquid onto the belt conveyor and / or the surface of the transported product, and a method of spraying with a spray or the like.

[0044] The method for dropping or continuously supplying the treatment liquid is not particularly limited, but it is preferable to use a tubular nozzle, which makes it easier to supply the treatment liquid to the target area. Examples of the tubular nozzle include a resin or metal tube such as SUS. The pressure and speed at which the treatment liquid is supplied through the tubular nozzle are not particularly limited; for example, the treatment liquid can be delivered at a pressure of 0.1 MPa or more and 0.3 MPa or less, and supplied through the tubular nozzle onto the belt conveyor and / or the surface of the transported product at a flow rate of 10 mL / min or more and 100 mL / min or less.

[0045] The method of spraying and supplying the treatment liquid is not particularly limited, but it is preferable to use a spray nozzle, since it can uniformly supply a relatively small amount of the treatment liquid of the belt conveyor lubricant composition over a wide area on the belt conveyor without waste. The form of spray varies depending on the type of spray nozzle, but it can be used according to the application, and for example, it can be appropriately selected from known nozzles. An example of the spray nozzle is a one-fluid nozzle that sprays the treatment liquid by applying liquid pressure. 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 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 more preferably 100 microns or more and 2,000 microns or less, since the treatment liquid can be sprayed uniformly and wear of the conveyor can be prevented. 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 is the angle at which the sprayed liquid spreads. When using a treatment liquid in which the total content (C+D) of the (C) component and the (D) component in the belt conveyor lubricant composition is 0.1 mass% or more and 2 mass% or less, the spray amount of the treatment liquid is preferably 10 mL / min or more and 200 mL / min or less per nozzle, and more preferably 30 mL / min or more and 100 mL / min or less from the viewpoint of maintaining optimal lubricity.

[0046] Preferred examples of the above-mentioned spray nozzles include hollow cone, full cone, flat spray, wide-angle spray, fine spray, solid spray, air atomizing spray, etc. Using the sol of these sprays, the treatment liquid can be sprayed and supplied onto the belt conveyor and / or the surface of the transported product.

[0047] The method of supplying the treatment liquid onto the belt conveyor and / or the surface of the transported product may be either continuous or intermittent. In the case of continuous spraying, the treatment liquid may be continuously sprayed onto the conveyor belt and / or the surface of the transported product at a spray rate of 5 mL / min or more and 80 mL / min or less. In the case of intermittent spraying, a long-term intermittent supply method is possible in which a stop time (non-supply time) corresponding to a time of 40 times or more and 720 times or less of the supply time is provided. Specifically, a method of continuously repeating a process of spraying at a spray rate of 10 mL / min or more and 100 mL / min or less for 5 seconds or more and 180 seconds or less, and then stopping spraying for 10 minutes or more and 180 minutes or less is preferable. In the intermittent spraying, the lubricity is maintained even when spraying is stopped because the lubricant composition for a belt conveyor once sprayed remains on the conveyor belt and / or the surface of the transported product. In the method for improving lubricity of the present invention, good lubricity is maintained even during intermittent spraying by using the lubricant composition for a belt conveyor of the present invention. As a spraying method, a method using intermittent spraying is preferred because it can reduce the amounts of the belt conveyor lubricant composition and water used.

[0048] The treatment liquid used in the method for improving the lubricity of a belt conveyor of the present invention is preferably adjusted to a pH of 4 or more and 9.5 or less by adding a base component or an acid component, and more preferably adjusted to a pH of 6.0 or more and 9.0 or less. If the pH of the treatment liquid is less than 4.0, problems may occur in which the belt conveyor or equipment in the beverage manufacturing process corrodes, and if the pH exceeds 9.5, problems such as cracks and cracks occurring in the transported PET bottles may occur due to a decrease in the ability to suppress cracks and cracks in the PET bottles. Examples of base components for adjusting the pH include sodium hydroxide, potassium hydroxide, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, and triisopropanolamine, and preferably monoethanolamine, triethanolamine, and monoisopropanolamine. These may be used alone or in combination of two or more. Examples of acid components for adjusting the pH 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, phosphoric acid, etc., and preferably acetic acid, citric acid, and ethylenediaminetetraacetic acid. These may be used alone or in combination of two or more.

[0049] The water used to dilute the belt conveyor lubricant composition can be pure water without hardness components, but generally can be water containing hardness components such as tap water.Tap water can be used for diluting the belt conveyor lubricant composition of the present invention as long as it has pH=5.8 to 8.6, German hardness 0°DH or more to 53.6°DH or less, chloride ion 0mg / L or more to 200mg / L or less, sodium and its compounds 0mg / L or more to 200mg / L or less, nitrate nitrogen and nitrite nitrogen 0mg / L or more to 10mg / L or less, fluorine and its compounds 0mg / L or more to 0.8mg / L or less, boron and its compounds 0mg / L or more to 1.0mg / L or less, total trihalomethane 0mg / L or more to 0.1mg / L or less, residual chlorine 0mg / L or more to 1mg / L or less, and organic matter amount (total organic carbon amount) 0mg / L or more to 3mg / L or less. There is no particular restriction on the total alkalinity, but it is preferable that it be 0 mg / L or more and 75 mg / L or less (calcium carbonate equivalent) as specified as the standard water quality for industrial water supply.

[0050] The belt conveyor applied to the method for improving the lubricity of a belt conveyor of the present invention can be made of various materials, but the material of the belt conveyor is preferably a resin product (for example, a resin product using polyolefin resin such as polyethylene or polypropylene, polyamide resin, polyester resin, polyacetal resin, etc.) because it has excellent lubricity, reduces wear of the belt conveyor, and is excellent in removal of dust generated by wear of the belt conveyor. The shape, structure, material, etc. of the conveyed item are not particularly limited, but a beverage container is preferable, and examples thereof include plastic containers made of polyethylene terephthalate (PET), polyethylene, polypropylene, polystyrene, polyamide, polycarbonate, etc.; paper containers such as paper packs (including wax finish and resin coating); metal containers made of iron, aluminum, tin, copper, zinc, or composite materials thereof; glass containers; ceramic containers, etc. Among these containers, the use of PET containers such as PET bottles is preferable because the effects of the present invention are significantly exhibited. In other words, the method for improving the lubricity of a belt conveyor of the present invention is particularly effective as a method for improving the lubricity of a belt conveyor for transporting PET containers. EXAMPLES

[0051] The present invention will be specifically described below with reference to examples. The components used in the belt conveyor lubricant compositions of the examples and comparative examples are shown in Tables 1 to 8 below. The numerical values ​​relating to the blending amounts shown in Tables 1 to 8 below are the ratios (mass%) of the pure content of each component to the belt conveyor lubricant composition, and in the following examples, "%" indicates mass% unless otherwise specified. The compounds used in the tests are shown below. The number in parentheses after the name of the alcohol indicates the carbon number of the aliphatic alcohol, EO is an abbreviation for ethylene oxide, the number after that indicates the average number of moles added (degree of polymerization), and the number in the last parentheses indicates the HLB.

[0052] (A) Component: A nonionic surfactant with an HLB level of 6 or more and 10 or less. A-1: Octadecyl alcohol (C18) EO 3 mole adduct (HLB6) (trade name EMALEX603, manufactured by Nippon Emulsion Co., Ltd.) A-2: Octadecyl alcohol (C18) EO 8 mole adduct (HLB10) (product name EMALEX608, manufactured by Nippon Emulsion Co., Ltd.) A-3: EO 4 mole adduct of octadecenyl alcohol (C18) (HLB 7.9) (trade name Brownon EN-1504, manufactured by Aoki Oil Industries) A-4: EO 5 mole adduct (HLB7) of docosyl alcohol (C22) (trade name EMALEX BHA-5, manufactured by Nippon Emulsion Co., Ltd.) A-5: 10 moles of EO adduct of docosyl alcohol (C22) (HLB10) (product name EMALEX BHA-10, manufactured by Nippon Emulsion Co., Ltd.) A-6: EO 5 mole adduct (HLB8) of isooctadecyl alcohol (C18) (product name EMALEX1805, manufactured by Nippon Emulsion Co., Ltd.) A-7: EO 5 mole adduct (HLB7) of octyldodecyl alcohol (C20) (product name EMALEX OD-5, manufactured by Nippon Emulsion Co., Ltd.) A-8: Octyldodecyl alcohol (C20) EO 10 mole adduct (HLB10) (product name EMALEX OD-10, manufactured by Nippon Emulsion Co., Ltd.) A-9: 5 mole adduct of decyltetradecyl alcohol (C24) with EO (HLB6) (trade name EMALEX2405, manufactured by Nippon Emulsion Co., Ltd.) A-10: Decyltetradecyl alcohol (C24) EO 10 mole adduct (HLB9) (trade name EMALEX2410, manufactured by Nippon Emulsion Co., Ltd.)

[0053] (B) Component: A nonionic surfactant with an HLB value of 12 or more and 18.5 or less. B-1: EO50 mole adduct of dodecyl alcohol (C12) (HLB17) (product name EMALEX750, manufactured by Nippon Emulsion Co., Ltd.) B-2: 25 moles of EO adduct of hexadecyl alcohol (C16) (HLB15) (product name EMALEX125, manufactured by Nippon Emulsion Co., Ltd.) B-3: Octadecenyl alcohol (C18) EO 13.5 mole adduct (HLB 13.6) (trade name: Brownon EN1513.5, manufactured by Aoki Oil Industries) B-4: Octadecenyl alcohol (C18) EO 30 mole adduct (HLB 16.5) (trade name Brownon EN1530, manufactured by Aoki Oil Industries) B-5: Octadecenyl alcohol (C18) EO60 mole adduct (HLB18.2) (trade name: Brownon EN1560, manufactured by Aoki Oil Industries) B-6: Octadecyl alcohol (C18) EO 30 mole adduct (HLB 16.6) (trade name: Brownon SR-730, manufactured by Aoki Oil Industries) B-7: EO 25 mole adduct (HLB14) of isooctadecyl alcohol (C18) (trade name EMALEX1825, manufactured by Nippon Emulsion Co., Ltd.) B-8: 30 mole adduct of docosyl alcohol (C22) with EO (HLB 16.1) (product name: Brownon BE-30, manufactured by Aoki Oil Industry Co., Ltd.) B-9: EO 20 mole adduct of octyldodecyl alcohol (C20) (HLB13) (product name EMALEX OD-20, manufactured by Nippon Emulsion Co., Ltd.) B-10: Octyldodecyl alcohol (C20) EO 25 mole adduct (HLB14) (trade name EMALEX OD-25, manufactured by Nippon Emulsion Co., Ltd.) B-11: Decyltetradecyl alcohol (C24) EO 20 mole adduct (HLB12) (trade name EMALEX2420, manufactured by Nippon Emulsion Co., Ltd.) B-12: Decyltetradecyl alcohol (C24) EO 25 mole adduct (HLB13) (trade name EMALEX2425, manufactured by Nippon Emulsion Co., Ltd.)

[0054] (C) Component: Hydrocarbon oil that is liquid at 20°C C-1: Viscosity 4.75mm at 37.8℃ 2 / s liquid paraffin (product name Hicol K-140N, manufactured by Kaneda Co., Ltd.) C-2: Viscosity 13.7mm at 37.8℃ 2 / s liquid paraffin (product name Hicol K-230N, manufactured by Kaneda Co., Ltd.) C-3: Viscosity 5.1mm at 40℃ 2 / s polyalphaolefin (trade name Synfluid PAO 2cSt, manufactured by Chevron Phillips Chemical Company LP) C-4: Viscosity 16.8mm at 40℃ 2 / s polyalphaolefin (trade name Synfluid PAO 4cSt, manufactured by Chevron Phillips Chemical Company LP)

[0055] (D) Component: Hydrocarbon that is solid at 20°C D-1: Docosan (product name PARAFOL 22-95, manufactured by SASOL LTD.) D-2: Paraffin wax with a melting point of 48°C (product name: Paraffin Wax-115, manufactured by Nippon Seiro Co., Ltd.) D-3: Paraffin wax with a melting point of 53°C (product name: Paraffin Wax-125, manufactured by Nippon Seiro Co., Ltd.) D-4: Paraffin wax with a melting point of 69°C (product name Paraffin Wax-155, manufactured by Nippon Seiro Co., Ltd.) D-5: Fischer-Tropsch wax with a melting point of 48.75°C (product name: KH PARAFFIN WAX F48H, manufactured by KING HONOR INTERNATIONAL)

[0056] Component (E): Polyol E-1: Glycerin E-2: Polyethylene glycol with a weight average molecular weight of 200 (EO 4 mole adduct)

[0057] (F) Component: Diol F-1: Propylene glycol F-2: Butylene glycol

[0058] (G) Ingredient: Water G-1: Tap water in Arakawa-ku, Tokyo (pH=7.6, total alkalinity (calcium carbonate equivalent) 40.5mg / L, German hardness 8.1°DH (including calcium hardness 6.3°DH and magnesium hardness 2.1°DH), chloride ions 21.9mg / L, sodium and its compounds 13mg / L, nitrate nitrogen and nitrite nitrogen 1.1mg / L, fluorine and its compounds 0.09mg / L, boron and its compounds 0.04mg / L, total trihalomethanes 0.014mg / L, residual chlorine 0.4mg / L, organic matter (total organic carbon) 0.5mg / L)

[0059] Component (H): Cationic surfactant H-1: Benzalkonium chloride (product name HYAMINE 3500-J, manufactured by ARXADA) H-2: Didecyldimethylammonium chloride (trade name Lipocard 210-80E, manufactured by Lion Separation Chemicals Co., Ltd.) H-3: Didecyldimethylammonium methosulfate (trade name Lipocard 210-80MSPG, manufactured by Lion Separation Chemicals Co., Ltd.) H-4: Dioctyldimethylammonium chloride (trade name BARDAC LF-80, manufactured by ARXADA) H-5: Octyldecyldimethylammonium chloride (JINGJIANG CONNECT CHEMICAL MANUFACTURING CO. LTD.) H-6: Benzethonium chloride (product name HYAMINE 1622, manufactured by ARXADA) H-7: Dodecyltrimethylammonium chloride (product name NIKKOL CA-2150, manufactured by Nikko Chemicals) H-8: Hexadecyltrimethylammonium chloride (trade name Lipocard 16-50E, manufactured by Lion Separation Chemicals Co., Ltd.) H-9: Cetylpyridinium chloride (brand name RONACARE, manufactured by Merck Performance Materials) H-10: Didecylmethylpolyoxyethylene ammonium propionate (trade name BARDAP26, manufactured by ARXADA)

[0060] (I) Ingredient: Preservative I-1: 2-Methyl-4-isothiazolin-3-one (trade name Acticide M20, manufactured by Thor Japan Co., Ltd.) I-2: 1,2-Benzisothiazolin-3-one (trade name Acticide B20(N), manufactured by Thor Japan Co., Ltd.)

[0061] (J) Component: Chelating agent J-1: Ethylenediaminetetraacetic acid, disodium salt J-2: Ethylenediaminetetraacetic acid, tetrasodium salt

[0062] Examples 1 to 67, Comparative Examples 1 to 6 Using tap water from Arakawa-ku, Tokyo, belt conveyor lubricant compositions were prepared according to the formulations shown in Tables 1 to 8, and the belt conveyor lubricant compositions were evaluated. The results are shown in Tables 1 to 8. For Examples 1 to 67 and Comparative Examples 1 to 6, tests *1 to *5 described below were performed using the undiluted lubricant composition. For Examples 63 to 67, the test *5 (storage stability test) was performed both in the case where the undiluted lubricant composition was used and in the case where the diluted lubricant composition was used. For Examples 42 to 67, the test *6 was also performed. For Examples 54 to 67, the test *7 was also performed.

[0063] *1 Lubricity test The dynamic friction coefficient between the belt conveyor and the bottle was measured by the following test method, and the lubricating properties of the belt conveyor lubricant composition was evaluated. Test Method: A polyethylene terephthalate (PET) container with a square bottom and a volume of 900 mL was placed on a belt conveyor (90 pieces of Tsubaki Yamakyu Chain Co., Ltd.'s Platop (registered trademark) chain (model number TTP826P-DIY), each piece 82.6 mm wide and 38.1 mm long, connected in the longitudinal direction), and the belt conveyor was run at 30 m / min. The undiluted solution or a treatment solution of a belt conveyor lubricant composition prepared by diluting it in advance with tap water was sprayed onto the conveyor through a hollow cone spray nozzle (product name Unijet TX, flow rate size 1, orifice diameter 0.51, manufactured by Spraying Systems Co., Ltd.) over 1 m of the conveyor belt. 2 After spraying at a rate of about 70 mL per container (for 24 seconds at a supply rate of 50 mL / min), the friction coefficient was measured immediately after spraying (immediately after adhesion) and when dry 30 minutes after spraying (after drying). The friction coefficient was calculated using the following formula by connecting the container to a load measuring device and measuring the tensile load value while the conveyor was in operation. Formula: Friction coefficient (μ) = tensile load (g) / container weight (g) Lubricity rating criteria: ○: Friction coefficient (μ) = 0.08 or more and less than 0.10 (good sliding). △: Friction coefficient (μ) = 0.10 or more and less than 0.13 (slides without problems). ×: Friction coefficient (μ) = 0.13 or more (poor slipperiness) or less than 0.08 (too slippery). The evaluation was made as △ or ◯, and the evaluation was made as practical.

[0064] *2 Water resistance test The water resistance of the belt conveyor lubricant composition was evaluated by measuring the dynamic friction coefficient between the belt conveyor and the bottle after supplying the original solution or treated solution of the belt conveyor lubricant composition to the belt conveyor that was constantly wet with water, by the following test method. That is, the lubricating performance of the belt conveyor lubricant composition when the belt conveyor was wet with water was tested. Test Method: A belt conveyor (90 pieces of Tsubaki Yamakyu Chain's Platop (registered trademark) chain (model number TTP826P-DIY), each piece 82.6 mm wide and 38.1 mm long, connected in the longitudinal direction) was run at 30 m / min, and water was supplied onto the conveyor through a SUS tube (inner diameter 6 mm) at a flow rate of 80 mL / min, and the conveyor was operated continuously for 5 minutes. After that, while continuing to supply water, a stock solution of the belt conveyor lubricant composition or a treatment solution prepared by diluting it in advance with tap water was sprayed onto the conveyor through a tubular nozzle over 1 m of the conveyor belt. 2 After that, a 900 mL polyethylene terephthalate (PET) container with a square bottom was placed on the conveyor and the friction coefficient (after washing with water) was measured. The friction coefficient was calculated by connecting the container to a load measuring device, measuring the tensile load value while the conveyor was in operation, and using the following formula. Formula: Friction coefficient (μ) = tensile load (g) / container weight (g) Lubricity rating criteria: ○: Friction coefficient (μ) = 0.10 or more and less than 0.12 (good sliding). △: Friction coefficient (μ) = 0.12 or more and less than 0.13 (slides without problems). ×: Friction coefficient (μ) = 0.13 or more (poor slipperiness). The evaluation was made as △ or ◯, and the evaluation was made as practical.

[0065] *3 Abrasion prevention test for belt conveyors A belt conveyor with a belt speed of 30 m / min (90 pieces of Tsubaki Yamakyu Chain Co., Ltd.'s Platop (registered trademark) chain (model number TTP826P-LFG), each piece 82.6 mm wide and 38.1 mm long, connected in the longitudinal direction) was sprayed with a hollow cone spray nozzle (product name Unijet TX, flow rate size 1, orifice diameter 0.51, manufactured by Spraying Systems Co., Ltd.) over a length of 1 m of the conveyor belt. 2After spraying at a rate of about 350 mL per bottle (for 120 seconds at a supply rate of 50 mL / min), the supply of the treatment liquid was stopped and the belt conveyor was allowed to continue operating for 30 minutes. After 30 minutes, a polyethylene terephthalate (PET) container with a square bottom and a volume of 900 mL was placed on the belt conveyor, the bottle was fixed to the conveyor guide with string, and the belt conveyor was operated for 30 seconds while the bottle was being pulled. After that, the presence or absence of dust-like dirt on the bottom of the bottle was confirmed. Abrasion resistance evaluation criteria: ○: No dirt is observed. △: A small amount of dust-like dirt is attached. ×: Dust-like dirt is attached. The items were judged as practical with ○ and △.

[0066] *4 Dust stain cleanability test A polyacetal resin conveyor (Tsubaki Yamakyu Chain Co., Ltd., Platop (registered trademark) chain (model number TTP826P)) was scraped using a flat, nominal size 150 mm, medium-grained iron file as specified in the Japanese Industrial Standard JIS-4703 to prepare dust-like dirt. 5 g of the original solution of the belt conveyor lubricant composition or a treatment solution prepared by diluting it with tap water in advance and 0.1 g of dust dirt were placed in a 100 mL volume glass conical beaker, mixed with a spoon, and then dried in an oven at 105 ° C. for 10 hours. After cooling to room temperature, 50 mL of tap water was added and stirred at 100 rpm for 30 seconds using a magnetic stirrer to confirm the cleanability of the dust dirt. If no dust lumps were observed, it was easy to wash with water and adhesion to the container was not noticeable, so it was evaluated as having good cleanability (○). Dust stain cleaning evaluation criteria: ○: The dust stains are dispersed in the water and no lumps are observed. △: The dust stains are almost completely dispersed in the water and no clumps are visible, but dust is floating on the surface of the liquid. ×: Clumps of dust stains are observed. The evaluation was made as △ or ◯, and the evaluation was made as practical.

[0067] *5 Storage stability test The belt conveyor lubricant composition was subjected to a storage stability test and evaluated by the following method. Test Method: 100 g of the belt conveyor lubricant composition (undiluted or diluted) was placed in a transparent glass bottle and allowed to stand at 50° C. for one month, after which the appearance was observed. Storage stability criteria: ○: No separation of the oil and water phases was observed and the mixture was stable. Δ: No overall separation, but some separation of the aqueous phase is observed at the bottom. ×: Creaming (dispersed oil phase droplets rise and become uneven) and oil droplets are observed on the liquid surface. The evaluation was made as △ or ◯, and the evaluation was made as practical.

[0068] *6 Bactericidal activity test The antibacterial properties of the belt conveyor lubricant composition were tested and evaluated by the following method. Test Method: Pseudomonas aeruginosa (test strain: NBRC13736) was cultured in a 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 100 g of the original solution of the belt conveyor lubricant composition or a treatment solution prepared by diluting it in advance with tap water to obtain a test solution, which was then allowed to stand at 25°C. After 30 minutes, 1 mL of the test solution was taken and mixed with a sterilized SCDLP agar medium to confirm the viable cell count and evaluate it according to the following criteria. Evaluation criteria: ◎: Log reduction of the test bacteria is 5 or more. ○: Log reduction of the test bacteria is 4 or more and less than 5. △: Log reduction of the test bacteria is 2 or more and less than 4. ×: Log reduction of test bacteria is less than 2 The items were judged as practical with ◎, ○, and △.

[0069] *7 Bactericidal activity test against cationic surfactant-resistant bacteria The antibacterial properties of the belt conveyor lubricant composition against cationic surfactant-resistant bacteria were tested and evaluated by the following method. Test Method: The test cationic surfactant-resistant strain cultured on SCD agar medium was suspended in sterilized physiological saline to prepare a bacterial solution with a 10^8 level of cfu / mL. 300 μL of the bacterial solution was added to 30 mL of the belt conveyor lubricant composition stock solution or a treatment solution prepared by diluting it in advance with tap water, and the mixture was allowed to come into contact at 25° C. for 7 days. 1 mL of the mixture was then mixed and cultured on SCD agar medium, and the viable bacterial count was confirmed and evaluated according to the following criteria. Test strains: The cationic surfactant-resistant strain, Serratia marcescens, was isolated and identified from a food processing plant. ○: Log reduction of the 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 items were judged as practical with ○ and △.

[0070] [Table 1]

[0071] [Table 2]

[0072] [Table 3]

[0073] [Table 4]

[0074] [Table 5]

[0075] [Table 6]

[0076]

Table 7

[0077]

Table 8

Claims

1. (A) a nonionic surfactant having an HLB of 6 or more and 10 or less, which is produced by adding ethylene oxide to an aliphatic alcohol having a hydrocarbon group with 18 to 24 carbon atoms; (B) a nonionic surfactant having an HLB of 12 or more and 18.5 or less, which is produced by adding ethylene oxide to an aliphatic alcohol having a hydrocarbon group with 12 to 24 carbon atoms, (C) a hydrocarbon oil that is liquid at 20° C. and is selected from liquid paraffin and / or polyalphaolefin; (D) a hydrocarbon which is solid at 20° C. and is selected from docosane and / or a hydrocarbon wax; (E) a polyol selected from glycerin and / or polyalkylene glycol (excluding diols); (F) at least one diol selected from ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, and hexylene glycol; (G) Water as a component, 1. A lubricant composition for a belt conveyor, comprising an oil-in-water emulsion comprising:

2. The weight ratio (A) / (B) of the component (A) to the component (B) is 0.25 or more and 9 or less; a weight ratio (C) / (D) of the component (C) to the component (D) is 0.25 or more and 19 or less; 2. The belt conveyor lubricant composition according to claim 1, wherein the weight ratio (C+D) / (A+B) of the total of the components (C) and (D) to the total of the components (A) and (B) is 2 or more and 10 or less.

3. 3. The belt conveyor lubricant composition according to claim 1, further comprising, as component (H), at least one disinfecting cationic surfactant selected from the group consisting of dioctyldimethylammonium salt, octyldecyldimethylammonium salt, didecyldimethylammonium salt, benzalkonium chloride, benzethonium chloride, dodecyltrimethylammonium salt, tetradecyltrimethylammonium salt, hexadecyltrimethylammonium salt, cetylpyridinium chloride, and didecylmethylpolyoxyethyleneammonium salt.

4. 4. The belt conveyor lubricant composition according to claim 3, further comprising, as component (I), at least one preservative selected from the group consisting of 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one.

5. 2. A method for improving the lubricity of a belt conveyor, comprising: supplying a treatment liquid containing components (C) and (D) in the belt conveyor lubricant composition according to claim 1 such that the total amount (C+D) of components (C) and (D) is 0.1 mass % or more and 2 mass % or less onto a belt conveyor that conveys an article and / or onto a surface of the article.

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