Lubricant composition for belt conveyors and method for improving the lubricity of belt conveyors

Abstract

To provide a lubricant composition for a belt conveyor, which exhibits excellent lubricity even when used in a small amount, exhibits excellent water resistance even on a wet conveyor, and hardly causes reduction of a lubricity.SOLUTION: A lubricant composition for a belt conveyor comprises an oil-in-water emulsion containing: a nonionic surfactant comprising an alkylene oxide adduct of an aliphatic alcohol having a hydrocarbon group of 12 to 32 carbon atoms as a component (A); an oily substance as a component (B); one or more kinds of polyol selected from glycerin and polyalkylene glycol as a component (C); a cationic surfactant as a component (D); an aliphatic alcohol having 16 to 24 carbon atoms as a component (E); and water as a component (F), wherein a weight ratio (E) / (A) of the component (A) to the component (E) is 0.02 or more and 4 or less.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, and more specifically to a lubricant composition for a belt conveyor used when moving and conveying plastic containers, paper containers, metal containers, glass containers, ceramic containers, etc. 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] The containers used for the beverages, foods, and the like include plastic containers made of polyethylene terephthalate or the like, paper containers, metal containers, glass containers, ceramic containers, and the like. In beverage manufacturing plants, belt conveyors are generally 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 between the containers or between the containers and the belt conveyor can cause the containers to deform or tip over. To prevent such problems, it is common for a belt conveyor lubricant to be applied or sprayed onto the belt conveyor to reduce the coefficient of friction between the containers and the transported objects.

[0003] Conventionally, an aqueous solution of a surfactant has been used as a lubricant for a belt conveyor. For example, Patent Document 1 discloses a lubricant composition for a resin conveyor, which comprises (A) at least one surfactant selected from nonionic surfactants such as polyoxyethylene alkyl ethers having 10 to 20 carbon atoms and having an HLB value of more than 16, (B) water, and (C) a cationic surfactant and / or an amphoteric surfactant, wherein the nonionic surfactant (A) and the cationic surfactant and / or amphoteric surfactant (C) are contained in a weight ratio of 5:1 to 1:30.

[0004] Patent Document 2 discloses a lubricant composition that can provide lubricity for a relatively long period of time with a small amount of use, and that contains at least one surfactant selected from the group consisting of a nonionic surfactant, an anionic surfactant, an aliphatic alkylamine, and an amphoteric surfactant, as well as a high-boiling solvent and water.

[0005] As a lubricant with excellent lubricity and water resistance, Patent Document 3 discloses a lubricant for belt conveyors that is an oil-in-water emulsion containing an oily substance selected from silicone oil, polyalphaolefin, and liquid paraffin, a nonionic emulsifier with an HLB of 16 or more, and a polyol.

[0006] Patent Document 4 discloses a belt conveyor lubricant comprising an oil-in-water emulsion containing, as component (A), a nonionic surfactant comprising 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 of component (A) to component (B), (B) / (A), is 2 or more and 7 or less; the mass ratio of component (A) to component (C), (C) / (A), is 1 or more and 20 or less; and the mass ratio of component (A) to component (D), (D) / (A), is 0.05 or more and 1 or less. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 4895572 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-106253 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-156521 [Patent Document 4] Patent No. 6762792 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0008] However, the lubricant composition for a belt conveyor described in Patent Document 1 needs to be supplied to the belt conveyor continuously or intermittently at short intervals, and when the lubricant composition is supplied to the conveyor intermittently at long intervals, sufficient lubricity and water resistance cannot be obtained. On the other hand, the lubricant composition described in Patent Document 2 can provide lubricity for a relatively long period of time with a small amount used, but has low water resistance. Therefore, when a beverage container passes through a rinser, warmer, pasteurizer, or the like, if water or hot water sprayed in a shower splashes directly onto the conveyor, or if water adheres to the outer surface of the bottle and then drips onto the conveyor, the lubricating components are easily removed by the water, resulting in a decrease in lubricity. Furthermore, the belt conveyor lubricant described in Patent Document 3 can provide lubrication for a relatively long period of time even with a small amount used, and the lubricating component is not easily removed even when water is splashed onto the conveyor or dripped from a bottle or the like, so the lubrication is not easily reduced and the lubrication is water-resistant. However, on the other hand, there is a problem in that a mixture of the belt conveyor lubricant composition 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 transported container and adheres to the bottom of the container, thereby contaminating the container. The lubricant for belt conveyors described in Patent Document 4 can provide excellent lubrication for a relatively long period of time with a small amount of use, and further generates little dust contamination due to wear, and even if dust contamination occurs, it is easy to remove. However, the lubrication may be reduced by the introduction of water, and sufficient water resistance was not obtained.

[0009] 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 small amounts, which generates little dust contamination due to wear when applied to a belt conveyor, and which, even if dust contamination does occur, is easily removable by washing with water, and a method for improving the lubricity of a belt conveyor using the same. [Means for solving the problem]

[0010] In order to solve the above problems, the present inventors have conducted extensive research and have found that by using an oil-in-water emulsion containing (A) a nonionic surfactant produced by adding an alkylene oxide to an aliphatic alcohol having a hydrocarbon group containing 12 to 32 carbon atoms, (B) an oily substance, (C) a polyol such as glycerin or a polyalkylene glycol, (D) a cationic surfactant, (E) an aliphatic alcohol having 16 to 24 carbon atoms, and (F) water, in which the weight ratio of components (A) to (E) is adjusted within a predetermined range, the use of such an oil-in-water emulsion as a belt conveyor lubricant composition surprisingly provides excellent lubricity even when used in small amounts, and further provides good lubricity even on conveyors that are constantly wet with a large amount of water, and exhibits excellent water resistance such that the lubricity is not easily reduced, thereby leading to the completion of the present invention.

[0011] That is, the present invention is (1) A nonionic surfactant comprising, as component (A), an alkylene oxide adduct of an aliphatic alcohol having a hydrocarbon group having 12 to 32 carbon atoms; (B) an oily substance as a component; Component (C) is one or more polyols selected from glycerin and polyalkylene glycols (D) a cationic surfactant as component (E) Component: aliphatic alcohol having 16 to 24 carbon atoms (F) Water as a component; and an oil-in-water emulsion comprising: a lubricant composition for a belt conveyor, characterized in that the weight ratio (E) / (A) of component (A) to component (E) is 0.02 or more and 4 or less; (2) The lubricant composition for a belt conveyor according to (1), wherein the mass ratio (B) / (A) of the component (A) to the component (B) is 2.5 or more and 70 or less, the mass ratio (C) / (A) of the component (A) to the component (C) is 5 or more and 100 or less, and the mass ratio (D) / (A) of the component (A) to the component (D) is 0.5 or more and 20 or less. (3) A belt conveyor lubricant composition according to either (1) or (2) above, wherein component (A) is an alkylene oxide adduct in which one or more polyoxyalkylene groups selected from ethylene oxide and propylene oxide are added to one or more aliphatic branched alcohols selected from octyldodecanol and decyltetradecanol, and the degree of polymerization of the polyoxyalkylene groups contained in the alkylene oxide adduct is 10 moles or more and 37 moles or less. (4) The lubricant composition for a belt conveyor according to any one of (1) to (3) above, wherein component (B) is a polyalphaolefin. (5) A lubricant composition for a belt conveyor according to any one of (1) to (4) above, wherein component (D) is a quaternary ammonium salt-type cationic surfactant and contains at least one selected from dioctyldimethylammonium salt, octyldecyldimethylammonium salt, didecyldimethylammonium salt, didodecyldimethylammonium salt, ditetradecyldimethylammonium salt, dihexadecyldimethylammonium salt, distearyldimethylammonium salt, dioleyldimethylammonium salt, dicoconut alkyldimethylammonium salt, dihardened tallow alkyldimethylammonium salt, dialkyl (C12-16) dimethylammonium salt, dialkyl (C14-18) dimethylammonium salt, benzalkonium chloride, benzethonium chloride, dodecyltrimethylammonium salt, tetradecyltrimethylammonium salt, hexadecyltrimethylammonium salt, octadecyltrimethylammonium salt, and behenyltrimethylammonium salt. (6) A lubricant composition for a belt conveyor according to any one of (1) to (5) above, wherein the cationic surfactant of component (D) contains at least one dialkyl (having 8 to 18 carbon atoms) dimethyl ammonium salt. (7) The lubricant composition for a belt conveyor according to any one of (1) to (6) above, wherein the component (E) is one or more selected from the group consisting of cetyl alcohol, stearyl alcohol, oleyl alcohol, arachidyl alcohol, and behenyl alcohol. (8) The belt conveyor lubricant composition according to any one of (1) to (7) above, further comprising, as component (G), one or more preservatives selected from 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one, and wherein the mass ratio (G) / (A) of component (A) to component (G) is 0.05 or more and 7 or less. (9) A lubricant composition for a belt conveyor according to any one of (1) to (8) above, further comprising, as component (H), at least one selected from rosin ethoxylate, aromatic sulfonic acid, or a salt thereof, and wherein the weight ratio (H) / (A) of component (A) to component (H) is 0.02 or more and 2 or less. (10) A method for improving the lubricity of a belt conveyor, comprising supplying a treatment liquid containing the belt conveyor lubricant composition according to any one of (1) to (9) above, the treatment liquid having a concentration of component (A) of 0.005% by mass or more and 0.2% by mass or less, onto the belt conveyor that conveys the conveyed product and / or onto the surface of the conveyed product. (11) The method for improving the lubricity of a belt conveyor according to (10) above, in which the treatment liquid is supplied as a drop or a continuous fluid using a tubular nozzle; (12) The method for improving the lubricity of a belt conveyor according to (10) above, in which the treatment liquid is sprayed onto the belt conveyor using a spray nozzle selected from a hollow cone, full cone, flat spray, wide-angle spray, and fine spray. (13) The method for improving the lubricity of a belt conveyor according to any one of (10) to (12) above, wherein the transported object is a polyethylene terephthalate container and the belt of the belt conveyor is made of resin. The gist of this paper is as follows. [Effects of the Invention]

[0012] The belt conveyor lubricant composition of the present invention exhibits excellent lubricity even when used in small amounts, and also exhibits very good water resistance, so that the lubricity is unlikely to decrease even when water is brought onto the conveying surface of the belt conveyor. Furthermore, by applying the belt conveyor lubricant composition of the present invention to the conveying surface, the problem of the conveying surface being scraped due to wear with the conveyed product and generating dust is suppressed. Furthermore, according to the present invention, even if dust does generate on the conveying surface, the presence of the belt conveyor lubricant composition of the present invention makes the dust well dispersible and less likely to form clumps, 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 above-mentioned lubricant composition for a belt conveyor of the present invention, and can improve the lubricity of a belt conveyor used for transporting containers for food and beverages, etc. DETAILED DESCRIPTION OF THE INVENTION

[0013] The nonionic surfactant of component (A) in the belt conveyor lubricant composition of the present invention is a compound represented by the following general formula (1). [C1] R1-O-(RO)mH (1) In the formula, R1 represents an aliphatic hydrocarbon group of 12 to 32, and specific examples thereof include dodecyl, tridecyl, isotridecyl, tetradecyl, pentadecyl, hexadecyl, octadecyl, octadecenyl, isooctadecyl, hexyldecyl, heptylundecyl, octyldodecyl, decyltetradecyl, dodecylhexadecyl, and tetradecyloctadecyl. Among these, hexyldecyl, octadecyl, octadecenyl, isooctadecyl, and decyltetradecyl groups are preferred, and decyltetradecyl is more preferred, because they provide excellent stability for the resulting oil-in-water emulsion, as well as excellent lubrication, water resistance, anti-wear properties for belt conveyers, and dust-cleaning properties. R2O represents an alkyleneoxy group having 2 to 4 carbon atoms, and specific examples include ethylene oxide, propylene oxide, and butylene oxide, but ethylene oxide and / or propylene oxide are preferred from the viewpoint of economy. The polymerization form of ethylene oxide and / or propylene oxide may be either homopolymerization or copolymerization, and the copolymerization form may be any of random copolymerization, block copolymerization, random / block copolymerization, etc. of ethylene oxide and propylene oxide. m is the average number of moles of alkyleneoxy groups added, and the degree of polymerization is preferably 10 moles or more and 37 moles or less, and more preferably 20 moles or more and 37 moles or less. If the degree of polymerization is less than 10 moles, the stability of the lubricant composition may decrease, and if the degree of polymerization exceeds 37 moles, the freezing point of the raw material itself may increase, resulting in decreased handleability and difficulty in production. When ethylene oxide and propylene oxide are contained as the alkyleneoxy groups, the total degree of polymerization thereof is preferably 10 moles or more and 37 moles or less, and more preferably 20 moles or more and 37 moles or less. The polyoxyalkylene group (-(RO)-) constituting the nonionic surfactant of component (A) is preferably formed by the addition of alkylene oxides containing at least ethylene oxide, and the proportion of oxyethylene groups in the polyoxyalkylene group is preferably 100 mol % or less, more preferably 85 mol % or less in order to provide the lubricant composition with better water resistance, and particularly preferably 65 mol % or less. When the polyoxyalkylene group is formed by the addition of ethylene oxide and another alkylene oxide, it is preferable to use a combination of ethylene oxide and another alkylene oxide, preferably ethylene oxide and propylene oxide, and to adjust the compounding ratio of the two so that the ethylene oxide is added in the above proportion (mol %).

[0014] From the viewpoint of maintaining the stability of the belt conveyor lubricant composition of the present invention, component (A) is preferably an alkylene oxide adduct in which one or more polyoxyalkylene groups selected from ethylene oxide and propylene oxide are added to one or more aliphatic branched alcohols selected from octyldodecanol and decyltetradecanol, and more preferably both ethylene oxide and propylene oxide are added. From the viewpoint of maintaining the stability of the belt conveyor lubricant composition and avoiding a decrease in handleability due to an increase in the freezing point of the raw material itself, it is more preferable that the alkylene oxide adduct contains a nonionic surfactant having a degree of polymerization of the polyoxyalkylene group of 10 moles or more and 37 moles or less.

[0015] The oily substance (B) in the belt conveyor lubricant composition of the present invention can be any substance that is poorly soluble in water and separates when mixed with water, but examples thereof include ester oil, polyalphaolefin, liquid paraffin, mineral oil, perfluoropolyether, dimethyl silicone oil, etc. These may be used alone or in combination of two or more, but polyalphaolefin, dimethyl silicone, and liquid paraffin are preferred from the viewpoint of lubricity, and polyalphaolefin is more preferred because it is easily removable by washing with water when dust stains occur due to wear on the belt conveyor. As the polyalphaolefin, a polyalphaolefin having a viscosity of 5 mm at 40°C is preferred. 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. Examples of such polyalphaolefins include Synfloid PAO 2cSt, Synfloid PAO 2.5cSt, Synfloid PAO 4cSt, and Synfloid PAO 5cSt (all trade names) manufactured by Chevron Phillips. In addition, as a dimethyl silicone oil, the viscosity at 25°C is 5mm 2 / s or more, 500mm 2 / s or less is preferable, and 5 mm 2 / s or more, 200mm 2 / s or less. Examples of such dimethyl silicone oils include SH200 FLUID 5cs and SH200 FLUID 350cs (both are trade names) manufactured by Toray Dow Corning Co., Ltd. The viscosity is measured in accordance with the ASTM D7042 standard. The (B) component is preferably blended so that the mass ratio of the (A) component to the (B) component, (B) / (A), is 2.5 or more and 70 or less, more preferably 5 or more and 40 or less, and particularly preferably 10 or more and 20 or less. If the (B) / (A) ratio is less than 2.5, the water resistance may decrease, and the lubricity of a wet belt conveyor may decrease, while if the blending ratio exceeds 70, the storage stability may decrease.

[0016] The component (C) in the belt conveyor lubricant composition of the present invention is one or more polyols selected from glycerin and polyalkylene glycols. These may be used alone or in combination. Examples of polyalkylene glycols that can be used include polyethylene glycols and random copolymers of ethylene oxide and propylene oxide. However, polyethylene glycol is preferred due to its excellent emulsion stability. The degree of polymerization (number of moles added) of ethylene oxide (EO) relative to polyethylene glycol is preferably 4 to 40 moles, more preferably 4 to 32 moles. If the degree of polymerization of EO relative to polyethylene glycol is less than 4 moles, emulsion stability may decrease, while if it exceeds 40 moles, lubrication and belt conveyor wear prevention may decrease. The (C) component is preferably blended so that the mass ratio of the (A) component to the (C) component, (C) / (A), is 5 or more and 100 or less, more preferably 8 or more and 60 or less, and particularly preferably 10 or more and 40 or less. If the (C) / (A) ratio is less than 5, storage stability and anti-wear properties may decrease, while if it exceeds 100, water resistance may decrease, and the lubricity of a wet belt conveyor may decrease.

[0017] The component (D) in the belt conveyor lubricant composition of the present invention is a cationic surfactant, which is blended as an emulsifier for the oily substance (component (B)) and / or as a disinfectant. The cationic surfactant may be one or more selected from the group consisting of primary alkylamines or salts thereof, tertiary alkylamines or salts thereof, alkyldiamines or salts thereof, alkyltriamines or salts thereof, and quaternary ammonium salt-type cationic surfactant alkylpyridinium salts. From the viewpoint of providing excellent emulsification properties for oily substances as component (B) and excellent stability when used in combination with one or more preservatives selected from 2-methyl-4-isothiazolin-3-one and / or 1,2-benzisothiazolin-3-one, which is component (G) described below, component (D) is preferably a quaternary alkyl ammonium salt, and examples thereof include dioctyl dimethyl ammonium salt, octyl decyl dimethyl ammonium salt, didecyl dimethyl ammonium salt, didodecyl dimethyl ammonium salt, ditetradecyl dimethyl ammonium salt, dihexadecyl dimethyl ammonium salt, and distearyl ammonium salt. Preferably, the alkyl acrylate or alkyl methacrylate is at least one selected from dimethylammonium salt, dioleyldimethylammonium salt, dicoconut alkyldimethylammonium salt, dihardened beef tallow alkyldimethylammonium salt, dialkyl (C12-16) dimethylammonium salt, dialkyl (C14-18) dimethylammonium salt, benzalkonium chloride, benzethonium chloride, dodecyl trimethylammonium salt, tetradecyl trimethylammonium salt, hexadecyl trimethylammonium salt, octadecyl trimethylammonium salt, and behenyl trimethylammonium salt.

[0018] Furthermore, from the viewpoint of particularly excellent improvements in emulsifiability and water resistance, the cationic surfactant used as component (D) is preferably a dialkyl (carbon number 8 to 18) dimethyl ammonium salt, more preferably one or more selected from distearyl dimethyl ammonium and dioleyl dimethyl ammonium salt, and from the viewpoint of particularly excellent performance in improving bactericidal properties, it is preferably one or more selected from benzalkonium chloride, didecyl dimethyl ammonium salt, dioctyl dimethyl ammonium salt and octyl decyl dimethyl ammonium salt. Using two or more of these in combination is even more preferable because it can achieve multifaceted effects. Furthermore, it is particularly preferable that component (D) be in the form of a chloride salt, as this provides excellent compatibility with carbonated PET bottles. The (D) component is preferably blended so that the mass ratio of the (A) component to the (D) component, (D) / (A), is 0.5 or more and 20 or less, more preferably 1 or more and 10 or less, and particularly preferably 1 or more and 4 or less. If the (D) / (A) ratio is less than 0.5, the water resistance may decrease and the lubricity of a wet belt conveyor may decrease, while if the blending ratio exceeds 20, the storage stability may decrease.

[0019] In the belt conveyor lubricant composition of the present invention, with regard to the blending ratios of components (B), (C), and (D) relative to component (A), it is particularly preferred that the mass ratio of component (A) to component (B), (B) / (A), is 2.5 or more and 70 or less, the mass ratio of component (A) to component (C), (C) / (A) is 5 or more and 100 or less, and the mass ratio of component (A) to component (D), (D) / (A) is 0.5 or more and 20 or less. In this way, by adjusting the other components relative to component (A), the intended object of the present invention can be more effectively achieved.

[0020] The component (E) in the belt conveyor lubricant composition of the present invention is an aliphatic alcohol having 16 to 24 carbon atoms. These may be used alone or in combination. By including the component (E) in a predetermined range, the belt conveyor lubricant composition of the present invention can have very good water resistance. Examples of the aliphatic alcohol having 16 to 24 carbon atoms include cetyl alcohol, stearyl alcohol, oleyl alcohol, arachidyl alcohol, behenyl alcohol, octyldodecanol, and decyltetradecanol. From the viewpoint of excellent lubricity, water resistance, and storage stability, one or more selected from cetyl alcohol, stearyl alcohol, oleyl alcohol, arachidyl alcohol, and behenyl alcohol are more preferred. Behenyl alcohol alone or a combination of behenyl alcohol with another of the above-mentioned aliphatic alcohols is particularly preferred. The (E) component can be blended so that the mass ratio (E) / (A) of the (A) component to the (E) component is 0.02 or more and 4 or less, but from the viewpoint of exhibiting better water resistance and storage stability, the (E) / (A) ratio is preferably 0.1 or more and 2 or less, and more preferably 0.3 or more and 1 or less. If the (E) / (A) ratio is less than 0.02, the water resistance may decrease and the lubricity of a wet belt conveyor may decrease, while if the blending ratio exceeds 4, the storage stability may decrease.

[0021] The water (F) in the belt conveyor 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, and organic matter (total organic carbon) 0.7 mg / L).

[0022] The belt conveyor lubricant composition of the present invention is an oil-in-water emulsion. The belt conveyor lubricant composition of the present invention may be prepared by mixing all of the components (A), (B), (C), (E), and (F), and then using a high-pressure emulsifying machine such as a homogenizer or colloid mill to prepare an emulsion. However, since the emulsion is easy to prepare, the components (A), (C), (D), and (E) are heated and mixed to 50 ° C or higher and 80 ° C or lower to melt, and then the component (B) is added and dispersed while stirring at a stirring speed of 50 to 1000 RPM using a stirring blade such as a paddle or propeller type, and the component (F) is gradually added and mixed with the component (C) so that the mass ratio (F) / (C) becomes 0.05 to 0.7 by 0.05 increments, and then the remaining component (F) is added to prepare an emulsion.

[0023] The belt conveyor lubricant composition of the present invention preferably further contains one or more preservatives selected from 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one as component (G). By adding component (G) to the belt conveyor lubricant composition of the present invention, the composition exhibits excellent disinfecting properties not only against general bacteria but also against bacterial species that are resistant to the cationic surfactant of component (A) (hereinafter sometimes abbreviated as cationic surfactant-resistant bacteria). The component (G) is preferably blended so that the mass ratio (G) / (A) of the component (A) to the component (G) is 0.05 or more and 7 or less, more preferably 0.1 or more and 2 or less, and particularly preferably 0.3 or more and 1 or less. If the ratio (G) / (A) is less than 0.05, the disinfecting effect against cationic surfactant-resistant bacteria may be insufficient, and even if the ratio exceeds 7, the effect saturates, making it difficult to obtain economic benefits.

[0024] The belt conveyor lubricant composition of the present invention preferably further contains, as component (H), at least one selected from rosin ethoxylate, aromatic sulfonic acid, or a salt thereof. These may be used alone or in combination. Adding component (H) to the belt conveyor lubricant composition of the present invention further improves the belt conveyor's anti-wear properties. Rosin ethoxylate is a nonionic surfactant obtained by adding ethylene oxide to rosin to introduce a polyoxyethylene chain. The degree of polymerization of ethylene oxide is preferably 10 moles or more and 30 moles or less. A degree of polymerization less than 10 moles may reduce water solubility and result in a decrease in the stability of the composition, while a degree of polymerization greater than 30 moles may reduce the belt conveyor's anti-wear properties. Furthermore, by incorporating an appropriate amount of component (H) into the composition of the present invention, it is possible to effectively prevent cracking and fractures in PET bottle containers during transportation. This effect tends to be particularly effective in preventing cracking during transportation of PET bottle containers filled with carbonated beverages and subjected to internal pressure. Component (H) is preferably blended so that the mass ratio of component (A) to component (H), (H) / (A), is 0.02 or more and 2 or less, more preferably 0.1 or more and 1 or less, and particularly preferably 0.2 or more and 0.5 or less. If (H) / (A) is less than 0.02, the anti-wear properties may decrease, and if it exceeds 2, the water resistance of the belt conveyor lubricant composition may decrease.

[0025] The belt conveyor 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 component (A) and component (D), and the like may be blended within a range that does not impair the effects of the present invention.

[0026] Surfactants that can be optionally added to the belt conveyor lubricant composition of the present invention include nonionic and anionic surfactants other than component (A), such as polyoxyalkylene alkyl ether acetates and salts thereof, polyoxyalkylene alkyl ether phosphates and salts thereof, alkylaminopropionates, polyoxyalkylene sorbitan fatty acid esters, polyoxalkylene sorbitol fatty acid esters, polyoxyalkylene glycerin fatty acid esters, polyglycerin fatty acid esters, polyoxyalkylene alkylamides, polyoxyalkylene castor oil, polyoxyalkylene hydrogenated castor oil, polyoxyalkylene lanolin ether, acetylene glycol ethylene oxide (EO) adducts, alkyldimethylamine oxides, and polyoxyalkylene-dimethylpolysiloxane copolymers. Examples of the polyoxyalkylene group include polyoxyethylene groups, polyoxypropylene groups, polyoxybutylene groups, and polycondensates of one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, etc. These surfactants may be used alone or in combination of two or more.

[0027] Examples of chelating agents that can be incorporated into the belt conveyor lubricant composition of the present invention include ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), hydroxyethylenediaminetriacetic acid (HEDTA), diethylenetriaminopentaacetic acid (DTPA), triethylenetetraaminehexaacetic acid (TTHA), and hydroxyethyliminodiacetic acid (HIDA). Other examples of chelating agents include amino acid chelating agents such as dihydroxyethylglycine (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, and malic acid. Chelating agents also include alkali metal salts, ammonium salts, and alkanolamine salts such as monoethanolamine, triethanolamine, and monoisopropanolamine of the above compounds. The above-mentioned chelating agents may be used alone or in combination of two or more.

[0028] The belt conveyor lubricant composition of the present invention can be used as a treatment solution for improving the lubricity of a belt conveyor. Alternatively, it can be provided as a concentrate and diluted with water to prepare a treatment solution for improving the lubricity of a belt conveyor. When provided as a concentrate, the blending amount of component (A) is preferably 0.3% by mass or more and 2% by mass or less. If the blending amount is less than 0.3% by mass, the low concentration results in increased transportation costs, making it difficult to obtain economic benefits. If the blending amount exceeds 2% by mass, the stability of the lubricant composition may be reduced. When the belt conveyor lubricant composition is a concentrate, the total proportion of all components other than water (components (A), (B), (C), (D), and (E) other than water, and optional components (G) and (H)) in the composition, excluding water (component (F)), is preferably 3% by mass or more and 85% by mass or less, more preferably 20% by mass or more and 75% by mass or less, and particularly preferably 25% by mass or more and 65% by mass or less, with the remainder being water.

[0029] 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. In the method for improving lubricity of the present invention, a treatment liquid containing the lubricant composition for a belt conveyor of the present invention, in which the concentration of component (A) is 0.005 mass % or more and 0.2 mass % or less, is supplied onto the belt conveyor and / or the surface of the conveyed article, thereby enjoying the various effects of the lubricant composition for a belt conveyor of the present invention described above, and enabling the belt conveyor to convey the article smoothly. In the method for improving lubricity of the present invention, the method for supplying the belt conveyor lubricant composition to the belt conveyor is not particularly limited, and the lubricant composition can be supplied, for example, by coating, dropping, or supplying as a continuous fluid, or by spraying. The concentration of component (A) in the treatment liquid is preferably 0.01 mass % or more and 0.1 mass % or less. When the concentration of component (A) in the belt conveyor lubricant composition is 0.005% by mass or more and 0.2% by mass or less, the undiluted solution can be used as is as the treatment liquid, whereas when the concentration of component (A) in the lubricant composition is a concentrate or the like in which the concentration exceeds 0.2% by mass, it is recommended to dilute it with water or the like and use it as the treatment liquid. If the concentration of component (A) in the treatment liquid is less than 0.005% by mass, the storage stability may decrease, while if it exceeds 0.2% by mass, the water resistance may decrease, which may decrease the lubricity of a wet belt conveyor or decrease the ability to suppress cracking and fractures in transported items such as PET bottles.

[0030] Methods for improving the lubricity of the belt conveyor of the present invention include a method of applying a treatment liquid having a concentration of component (A) of 0.005 mass % or more and 0.2 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.

[0031] The method for supplying the treatment liquid dropwise or continuously is not particularly limited, but the use of a tubular nozzle is preferred because it makes it easier to supply the treatment liquid to the target area. Examples of the tubular nozzle include a tube made of resin or metal such as SUS. The pressure and speed at which the treatment liquid is supplied through the tubular nozzle are not particularly limited, but 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 onto the belt conveyor and / or the surface of the transported product through the tubular nozzle at a flow rate of 10 mL / min or more and 100 mL / min or less.

[0032] The method of spraying and supplying the treatment liquid is not particularly limited, but using a spray nozzle is preferred because 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 spray form varies depending on the type of spray nozzle, but it can be selected according to the application, for example, 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 is more preferably 100 microns or more and 2,000 microns or less in order to ensure uniform spraying of the treatment liquid and prevent wear on the 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 in order to maintain optimal lubrication.

[0033] Preferred examples of the above-mentioned spray nozzles include hollow cone, full cone, flat spray, wide-angle spray, fine spray, solid spray, and air atomizing spray. The sol of these sprays can be used to spray and supply the treatment liquid onto a belt conveyor.

[0034] The method for supplying the treatment solution onto the belt conveyor and / or the surface of the conveyed product may be either continuous or intermittent. In the case of continuous spraying, the treatment solution may be continuously sprayed onto the conveyor belt and / or the conveyed product at a spray rate of 5 mL / min to 80 mL / min. In the case of intermittent spraying, a long-term intermittent supply method is possible, with a stop time of 40 to 720 times the supply time. Specifically, a process of spraying at a spray rate of 10 mL / min to 100 mL / min for 5 to 180 seconds, and then stopping spraying for 10 to 180 minutes, may be continuously repeated. In the case of intermittent spraying, lubricity is maintained even when spraying is stopped because the sprayed belt conveyor lubricant remains on the conveyor belt. The method for improving lubricity of the present invention maintains good lubricity even during intermittent spraying by using the belt conveyor lubricant composition of the present invention. Intermittent spraying is preferred because it also reduces the amount of belt conveyor lubricant and water used.

[0035] The treatment solution 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 higher and 9.5 or lower by adding a base or acid component, and more preferably adjusted to a pH of 6.0 or higher and 9.0 or lower. If the pH of the treatment solution is less than 4.0, corrosion problems may occur in the belt conveyor or equipment used in the beverage production process. If the pH exceeds 9.5, the treatment solution may exhibit reduced cracking and craze suppression properties in PET bottles, resulting in cracking and crazes in the transported PET bottles. Examples of base components used to adjust the pH include sodium hydroxide, potassium hydroxide, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, and triisopropanolamine, with monoethanolamine, triethanolamine, and monoisopropanolamine being preferred. These may be used alone or in combinations 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, and phosphoric acid, with acetic acid, citric acid, and ethylenediaminetetraacetic acid being preferred. These may be used alone or in combination of two or more.

[0036] The water used to dilute the belt conveyor lubricant composition can be pure water containing no hardness components, but it is generally assumed that water containing hardness components, such as tap water, will be used. Tap water can be used to dilute the belt conveyor lubricant composition of the present invention if it has a pH of 5.8 to 8.6, a total alkalinity of 0 to 53.6° DH on the German hardness scale, a chloride ion content of 0 to 200 mg / L, a sodium and its compounds of 0 to 200 mg / L, a nitrate nitrogen and nitrite nitrogen content of 0 to 10 mg / L, a fluorine and its compounds of 0 to 0.8 mg / L, a boron and its compounds of 0 to 1.0 mg / L, a total trihalomethane content of 0 to 0.1 mg / L, a residual chlorine content of 0 to 1 mg / L, and an organic matter content (total organic carbon content) of 0 to 3 mg / L. There are no particular restrictions on the total alkalinity, but it is preferably 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.

[0037] The method for improving the lubricity of a belt conveyor of the present invention has excellent lubricity, reduces wear on the belt conveyor, and is excellent at removing dust even if it is generated due to wear on the belt conveyor. Therefore, it is preferable that the belt in the belt conveyor is a resin product (for example, a resin product using a polyolefin resin such as polyethylene or polypropylene, a polyamide resin, a polyester resin, a polyacetal resin, or the like). The shape, structure, material, etc., of the conveyed object are not particularly limited, but beverage containers are preferred, including plastic containers made of polyethylene terephthalate (PET), polyethylene, polypropylene, polystyrene, polyamide, polycarbonate, etc.; paper containers such as paper cartons (including wax-finished or resin-coated); metal containers made of iron, aluminum, tin, copper, zinc, or composite materials thereof; glass containers; and ceramic containers. Among these containers, use with PET containers such as PET bottles is preferred, as the effects of the present invention are most pronounced. 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 PET containers when conveying them. [Example]

[0038] 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 6 below. The numerical values relating to the blending amounts shown in Tables 1 to 6 below are the ratios (mass %) of the pure content of each component to the belt conveyor lubricant composition, and in the following examples, "%" means mass % unless otherwise specified. The compounds used in the test are listed below. Note that the number in parentheses after the alcohol name indicates the carbon number of the aliphatic alcohol, EO stands for ethylene oxide, and PO stands for propylene oxide, and the numbers after them indicate the average number of moles added (degree of polymerization) of EO and PO, respectively.

[0039] (A) Component: Nonionic surfactant A-1: EO 10 mole adduct of dodecyl alcohol (C12) A-2: 13 moles of EO adduct of hexadecyl alcohol (C16) A-3: 13 moles of EO adduct of hexyldecyl alcohol (C16) A-4: EO 15 mole adduct of octadecenyl alcohol (C18) A-5: EO 15 mole adduct of octadecyl alcohol (C18) A-6: EO 16 mole adduct of isooctadecyl alcohol (C18) A-7: EO 10 mole adduct of octyldodecyl alcohol (C20) A-8: EO 25 mole adduct of octyldodecyl alcohol (C20) A-9: EO 15 mole adduct of decyltetradecyl alcohol (C24) A-10: EO 25 mole adduct of decyltetradecyl alcohol (C24) A-11: Decyltetradecyl alcohol (C24) adduct of 20 moles of EO and 6 moles of PO A-12: Decyltetradecyl alcohol (C24) adduct of 30 moles of EO and 6 moles of PO A-13: Decyltetradecyl alcohol (C24) adduct of 24 moles of EO and 13 moles of PO A-14: EO 30 mole adduct of dodecylhexadecyl alcohol (C28) A-15: EO 30 mole adduct of tetradecyl octadecyl alcohol (C32)

[0040] (A) Comparative ingredient A'-16: Decyl alcohol (C10) EO 10 mole adduct A'-17: Decyl alcohol (C10) adduct of 12 moles of EO and 3 moles of PO

[0041] (B) Component: Oily substance B-1: Viscosity 5.1 mm at 40°C 2 / s polyalphaolefin (trade name: Synfluid PAO 2cSt, manufactured by Chevron Phillips Chemical Company LP) B-2: Viscosity 8.3mm at 40℃ 2 / s polyalphaolefin (trade name: Synfluid PAO 2.5cSt, manufactured by Chevron Phillips Chemical Company LP) B-3: Viscosity 5mm at 25℃ 2 / s dimethyl silicone (product name SH200 FLUID 5cs, manufactured by Toray Dow Corning Co., Ltd.) B-4: Viscosity 350mm at 25℃ 2 / s dimethyl silicone (product name SH200 FLUID 350cs, manufactured by Toray Dow Corning Co., Ltd.) B-5: Viscosity 5.8-8.9mm at 37.8℃ 2 / s liquid paraffin (product name: Hicol K-160, manufactured by Kaneda Co., Ltd.)

[0042] Component (C): Polyol C-1: Glycerin C-2: Polyethylene glycol (EO 4 mole adduct) with a weight average molecular weight of 200 C-3: Polyethylene glycol (EO3 2 mole adduct) with a weight average molecular weight of 1540

[0043] Component (D): Cationic surfactant D-1: Benzalkonium chloride (product name: HYAMINE 3500-J, manufactured by Lonza Japan) D-2: Dioleyldimethylammonium chloride (trade name: Paionin B-2811, manufactured by Takemoto Oil Co., Ltd.) D-3: Octyldecyldimethylammonium chloride (trade name: Octyl Decyl Dimethyl Ammonium Chloride 80%, manufactured by RUGAO WANLI CHEMICAL INDUSTRY CO., LTD.)

[0044] (E) Ingredient: Fatty alcohol E-1: Cetyl alcohol E-2: Stearyl alcohol E-3: Arachidyl alcohol E-4: Behenyl alcohol E-5: Decyltetradecyl alcohol

[0045] (E) Comparative ingredients E'-1: Lauryl alcohol E'-2: Myristyl alcohol

[0046] (F) Ingredient: Water F-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)

[0047] (G) Ingredient: Preservative G-1: 2-methyl-4-isothiazolin-3-one (trade name Acticide M20, manufactured by Thor Japan Co., Ltd.) G-2: 1,2-benzisothiazolin-3-one (trade name Acticide B20(N), manufactured by Thor Japan Co., Ltd.)

[0048] (H) Ingredients: Rosin ethoxylate, aromatic sulfonic acid H-1: Rosin ethoxylate (EO 15 mole adduct) H-2: Rosin ethoxylate (EO 30 mole adduct) H-3: Xylene sulfonic acid H-4: Toluenesulfonic acid H-5: Cumene sulfonic acid H-6: Sodium 4-methoxybenzenesulfonate

[0049] (I) Component: Chelating agent I-1: Ethylenediaminetetraacetic acid disodium salt I-2: Ethylenediaminetetraacetic acid trisodium salt

[0050] Examples 1 to 60, Comparative Examples 1 to 9 Lubricant compositions for belt conveyors were prepared using tap water from Arakawa Ward, Tokyo, according to the formulations shown in Tables 1 to 6, and the lubricant compositions for belt conveyors were evaluated. The results are shown in Tables 1 to 6. For Examples 1 to 55 and Comparative Examples 1 to 9, the undiluted lubricant compositions were used to carry out the tests *1 to *6 (or *7) described below. For Examples 56 to 60, the undiluted lubricant compositions were used to carry out the test *5 described below, and lubricant treatment solutions diluted at the dilution ratios shown in Table 5 were also used to carry out the tests *1 to *7 described below.

[0051] *1 Lubricity test The coefficient of dynamic friction between the belt conveyor and the bottle was measured by the following test method to evaluate the lubricity of the belt conveyor lubricant composition. 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's Platop (registered trademark) chain (model number TTP826P-DIY), each 82.6 mm wide and 38.1 mm long, connected in the longitudinal direction), and the belt conveyor was run at 30 m / min. A treatment solution of a belt conveyor lubricant composition, either undiluted or prepared by diluting it with tap water, was sprayed onto the conveyor through a hollow cone spray nozzle (trade 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, with the container and a load measuring device connected, and the tensile load value measured while the conveyor was running. Friction coefficient (μ) = tensile load (g) / container weight (g) Lubricity evaluation 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 slipperiness). The evaluation was made as △ and ○ for practical use.

[0052] *2 Water resistance test According to the following test method, the water resistance of the belt conveyor lubricant composition was evaluated by measuring the coefficient of dynamic friction between the belt conveyor and the bottle after supplying the undiluted solution or treated solution of the belt conveyor lubricant composition to a belt conveyor that was constantly wet with water. Test Method: A belt conveyor [90 pieces of Tsubaki Yamakyu Chain's Platop (registered trademark) chain (model number TTP826P-DIY), each 82.6 mm wide and 38.1 mm long, connected lengthwise] 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 for 5 minutes. After that, while continuing to supply water, the undiluted solution or a treatment solution prepared in advance by diluting it with tap water was sprayed onto the conveyor through a tubular nozzle for 1 m of the conveyor belt. 2 The solution was sprayed at a rate of about 70 mL per container (for 24 seconds at a supply rate of 50 mL / min), after which a 900 mL polyethylene terephthalate (PET) container with a square bottom was placed on the conveyor and the coefficient of friction (after washing with water) was measured. The coefficient of friction was calculated using the following formula, after connecting the container to a load measuring device and measuring the tensile load while the conveyor was running. Friction coefficient (μ) = tensile load (g) / container weight (g) Lubricity evaluation 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) or less than 0.10 (too slipperiness). The evaluation was made as △ and ○ for practical use.

[0053] *3 Belt conveyor wear prevention test The undiluted solution or the treatment solution prepared by diluting it in advance with tap water was sprayed onto a belt conveyor (90 pieces of Tsubaki Yamakyu Chain Co., Ltd.'s Platop (registered trademark) chain (model number TTP826P-LFG) with a width of 82.6 mm and a length of 38.1 mm connected lengthwise) at a speed of 30 m / min through a hollow cone spray nozzle (product name: Unijet TX, flow rate size 1, orifice diameter 0.51, manufactured by Spraying Systems Co., Ltd.) for 1 m of the conveyor belt. 2 After spraying at a rate of approximately 350 mL per container (for 120 seconds at a supply rate of 50 mL / min), the supply of the treatment solution was stopped and the belt conveyor was allowed to run for 30 minutes. After 30 minutes, a square-bottomed, 900 mL polyethylene terephthalate (PET) container was placed on the belt conveyor, the bottle was secured to the conveyor guide with string, and the belt conveyor was run 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 checked. Abrasion resistance evaluation criteria: ○: No stains are observed. △: A small amount of dusty dirt is attached. ×: Dusty dirt is attached. The products were judged as practical with ○ and △.

[0054] *4 Dust stain cleanability test A polyacetal resin conveyor (Tsubaki Yamakyu Chain Co., Ltd., Platop® chain (model number TTP826P)) was filed using a flat, 150mm, medium-grit iron file as specified in Japanese Industrial Standard JIS-4703 to remove dust-like dirt. 5g of the original solution or a treatment solution prepared by diluting it with tap water and 0.1g of the dust stains were placed in a 100mL conical glass beaker and mixed with a spoon. The mixture was then dried in an oven at 105°C for 10 hours. After cooling to room temperature, 50mL of tap water was added and the mixture was stirred at 100 rpm for 30 seconds using a magnetic stirrer to check the cleanability of the dust stains. If no clumps of dust were observed, the mixture was easy to wash with water and did not noticeably adhere to the container, and was rated as good cleanability (Good). Dust and dirt cleanability evaluation criteria: ○: The dust stains are dispersed in the water and no clumps are observed. △: The dust stains are mostly 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 △ and ○ for practical use.

[0055] *5 Storage stability test The belt conveyor lubricant compositions were subjected to stability tests and evaluated by the following methods. 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. Stability criteria: ○: No separation of the oil and water phases was observed and the mixture was stable. △: No overall separation, but slight 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 △ and ○ for practical use.

[0056] *6 Bacterial sterilization test The antibacterial properties of the 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 prepare 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 or a treatment solution prepared in advance by diluting with tap water to prepare 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 sterilized SCDLP agar medium. The viable cell count was confirmed and evaluated according to the following criteria. Evaluation criteria: ◎: Log reduction of the number of test bacteria is 5 or more. ○: Log reduction of the test bacteria is 4 or more but less than 5. △: Log reduction of test bacteria is 2 or more and less than 4 ×: Log reduction of test bacteria is less than 2 The evaluation was made as being practical with ◎, ○, and △.

[0057] *7 Bactericidal test against cationic surfactant-resistant bacteria The antibacterial properties of the belt conveyor lubricant compositions against cationic surfactant-resistant bacteria were tested and evaluated by the following method. Test Method: The test cationic surfactant-resistant strains cultured on SCD agar medium were suspended in sterilized saline to prepare a bacterial suspension with a 10^8 level of cfu / mL. 300 μL of the bacterial suspension was added to 30 mL of the original solution or a treatment solution prepared in advance by diluting with tap water, and the mixture was allowed to come into contact at 25°C for 7 days. 1 mL of this mixture was then pour-cultured on SCD agar medium, and the viable cell count was confirmed and evaluated according to the following criteria. Test strains: The cationic surfactant-resistant strain of Serratia marcescens, which was collected, isolated, and identified in a food factory, was used. ○: 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 number of test bacteria is less than 4. The products were judged as practical with ○ and △.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3]

[0061] [Table 4]

[0062]

Table 5

[0063]

Table 6

Claims

1. (A) a nonionic surfactant comprising an alkylene oxide adduct of an aliphatic alcohol having a hydrocarbon group having 12 to 32 carbon atoms; (B) an oily substance as a component; Component (C) is one or more polyols selected from glycerin and polyalkylene glycols. A cationic surfactant as component (D) (E) Component: an aliphatic alcohol having 16 to 24 carbon atoms (F) water as component; and an oil-in-water emulsion comprising: A lubricant composition for a belt conveyor, characterized in that the mass ratio (E) / (A) of component (A) to component (E) is 0.02 or more and 4 or less.

2. Furthermore, the mass ratio (B) / (A) of the component (A) to the component (B) is 2.5 or more and 70 or less; the mass ratio (C) / (A) of the component (A) to the component (C) is 5 or more and 100 or less; 2. The lubricant composition for a belt conveyor according to claim 1, wherein the mass ratio (D) / (A) of the component (A) to the component (D) is 0.5 or more and 20 or less.

3. the component (A) is an alkylene oxide adduct in which one or more polyoxyalkylene groups selected from ethylene oxide and propylene oxide are added to one or more aliphatic branched alcohols selected from octyldodecanol and decyltetradecanol, 3. The lubricant composition for a belt conveyor according to claim 1, wherein the degree of polymerization of the polyoxyalkylene group contained in the alkylene oxide adduct is 10 mol or more and 37 mol or less.

4. 4. The lubricant composition for a belt conveyor according to claim 1, wherein component (B) is a polyalphaolefin.

5. 5. The belt conveyor lubricant composition according to claim 1, wherein component (D) is a quaternary ammonium salt-type cationic surfactant and contains at least one selected from the group consisting of dioctyldimethylammonium salt, octyldecyldimethylammonium salt, didecyldimethylammonium salt, didodecyldimethylammonium salt, ditetradecyldimethylammonium salt, dihexadecyldimethylammonium salt, distearyldimethylammonium salt, dioleyldimethylammonium salt, dicoconut alkyldimethylammonium salt, di-hardened tallow alkyldimethylammonium salt, dialkyl (C12-16) dimethylammonium salt, dialkyl (C14-18) dimethylammonium salt, benzalkonium chloride, benzethonium chloride, dodecyltrimethylammonium salt, tetradecyltrimethylammonium salt, hexadecyltrimethylammonium salt, octadecyltrimethylammonium salt, and behenyltrimethylammonium salt.

6. 6. The belt conveyor lubricant composition according to claim 1, wherein the cationic surfactant of component (D) contains at least one dialkyl (having 8 to 18 carbon atoms) dimethyl ammonium salt.

7. 7. The belt conveyor lubricant composition according to claim 1, wherein component (E) is at least one selected from the group consisting of cetyl alcohol, stearyl alcohol, oleyl alcohol, arachidyl alcohol, and behenyl alcohol.

8. Furthermore, the composition contains, as a component (G), one or more preservatives selected from 2-methyl-4-isothiazolin-3-one and 1,2-benzisothiazolin-3-one, 8. The lubricant composition for a belt conveyor according to claim 1, wherein the mass ratio (G) / (A) of the component (A) to the component (G) is 0.05 or more and 7 or less.

9. 9. The belt conveyor lubricant composition according to claim 1, further comprising, as component (H), at least one selected from the group consisting of rosin ethoxylate, aromatic sulfonic acid, and a salt thereof, and wherein the weight ratio (H) / (A) of component (A) to component (H) is 0.02 or more and 2 or less.

10. 10. A method for improving the lubricity of a belt conveyor, comprising supplying a treatment liquid containing the belt conveyor lubricant composition according to claim 1, wherein the concentration of component (A) is 0.005% by mass or more and 0.2% by mass or less, onto the belt conveyor that conveys the conveyed product and / or onto the surface of the conveyed product.

11. 11. The method for improving the lubricity of a belt conveyor according to claim 10, wherein the treatment liquid is supplied as a drop or a continuous fluid using a tubular nozzle.

12. 11. The method for improving the lubricity of a belt conveyor according to claim 10, wherein the treatment liquid is sprayed onto the belt conveyor using a spray nozzle selected from a hollow cone, full cone, flat spray, wide-angle spray, and fine spray.

13. 13. The method for improving lubricity of a belt conveyor according to any one of claims 10 to 12, wherein the transported object is a container made of polyethylene terephthalate, and the belt of the belt conveyor is made of resin.

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