antifouling agent

Abstract

The present invention provides an antifouling agent comprising: (a) a branched alkyl sulfosuccinate ester in which the branched alkyl group has 8 to 13 carbon atoms (hereinafter referred to as component (a)). The present invention also provides an antifouling method in which a treatment liquid containing component (a) is brought into contact with an object to be treated.

Description

TECHNICAL FIELD

[0001] The present application relates to an antifouling agent and an antifouling method. BACKGROUND

[0002] The case where water comes into contact with a hydrophobic surface exists everywhere. For example, in the case where residual hot water is left for the next washing in a whole bathroom in a household, an oily component such as sebum adheres to the hydrophobic surface of a bathtub, causing the bathtub to be contaminated. Or, if oil dirt adheres to the inside of a dishwashing machine, the cleaning efficiency is reduced. Further, if an oily component exists, in a pit or a pipe that becomes a flow path of water, the oily component is adsorbed to a hydrophobic material, contaminating the surface of the hydrophobic material. Therefore, there is a demand for an antifouling technology that inhibits the adsorption of an oily component or the like to a hydrophobic surface that comes into contact with water.

[0003] On the other hand, it is known that sulfosuccinates have excellent cleaning properties and surface activity as surfactants (for example, Japanese Patent Application Publication No. 2017-214554, U.S. Patent Application Publication No. 2007 / 0214999). SUMMARY

[0004] There is a demand for a technology that inhibits the adsorption of an oily component or the like to a hydrophobic surface that comes into contact with water. In addition, on a hydrophobic surface, a hydrophobic dirt component that is dissolved into water by a cleaning agent can sometimes be reattached. Therefore, for example, in the case of cleaning a resin-made dishware with an automatic dishwashing machine, oil dirt that is dissolved into water by cleaning is transferred to the resin-made dishware, becoming one of the main causes of reducing the satisfaction degree of stain removal.

[0005] The present application provides an antifouling agent and an antifouling method that inhibit the adsorption of an oily component to the surface of a treatment target.

[0006] The present application relates to an antifouling agent containing (a) a sulfosuccinic acid branched alkyl ester in which the branched alkyl group is a branched alkyl group having 8 or more and 13 or less carbon atoms (hereinafter referred to as the (a) component).

[0007] In addition, the present application relates to an antifouling method in which a treatment liquid containing a sulfosuccinic acid branched alkyl ester in which the branched alkyl group is a branched alkyl group having 8 or more and 13 or less carbon atoms is brought into contact with a treatment target.

[0008] According to the present application, an antifouling agent and an antifouling method that inhibit the adsorption of an oily component to the surface of a treatment target are provided. DETAILED DESCRIPTION

[0009] As a result of intensive studies by the inventors, it has been found that by bringing a specific compound into contact with a treatment target, the adsorption of an oily component to the surface of the treatment target can be inhibited, and an excellent antifouling effect can be exhibited, thereby completing the present application.

[0010] The mechanism by which the antifouling agent of the present application inhibits the adsorption of an oily component to the surface of a treatment target has not been determined, but it can be considered that the antifouling agent of the present application is adsorbed to the surface of the treatment target, controls the surface energy of the treatment target (modifies the surface of the treatment target), and thereby prevents the adsorption of an oily component to the surface of the treatment target. According to the antifouling agent and the antifouling method of the present application, if the treatment target is treated in advance with the antifouling agent of the present application, not only an excellent antifouling effect can be obtained, but also by containing the antifouling agent of the present application in a prescribed concentration in a cleaning liquid or the like for the treatment target, it is possible to prevent the reattachment of a fouling component contained in the cleaning liquid or the like to the treatment target. In particular, according to the antifouling agent of the present application, it is possible to prevent the adsorption of an oily component contained in water to a hydrophobic surface.

[0011] <Antifouling agent>

[0012] The antifouling agent of the present application contains (a) a branched alkyl sulfosuccinate ester in which the branched alkyl group has 8 to 13 carbon atoms (hereinafter referred to as the (a) component). The antifouling agent of the present application can contain the (a) component as an effective component, for example, as an effective component for imparting an antifouling effect to a target.

[0013] The (a) component is a branched alkyl sulfosuccinate ester in which the branched alkyl group has 8 to 13 carbon atoms. The branched alkyl sulfosuccinate ester of the (a) component can be a salt. That is, the (a) component can be one or more compounds selected from branched alkyl sulfosuccinate esters in which the branched alkyl group has 8 to 13 carbon atoms and salts thereof. The salt can include inorganic salts such as sodium salts, potassium salts, ammonium salts, and magnesium salts, and organic salts such as monoethanolamine salts, diethanolamine salts, triethanolamine salts, and morpholine salts. The salt is preferably a salt selected from sodium salts, potassium salts, ammonium salts, magnesium salts, and monoethanolamine salts, more preferably an inorganic salt selected from sodium and potassium salts, and even more preferably a sodium salt.

[0014] The (a) component can include compounds in which the ester is a monoester, and compounds in which the ester is a diester. It is preferable that the (a) component be a branched alkyl sulfosuccinate diester in which the branched alkyl group has 8 to 13 carbon atoms.

[0015] The branched alkyl group of the (a) component is preferably a branched alkyl group having 8 to 11 carbon atoms, and particularly preferably a branched alkyl group having 9 or 10 carbon atoms.

[0016] The branched alkyl group of the (a) component is preferably a branched alkyl group having a main chain with 6 or 7 carbon atoms and one or more side chains.

[0017] The branched alkyl group of the component (a) is preferably a branched alkyl group having a main chain of 6 or 7 carbon atoms and 1 or more side chains, and the total number of carbon atoms of the side chains is 3 or 4.

[0018] The branched alkyl group of the component (a) is preferably a branched alkyl group selected from the group consisting of 2-propylheptyl and 3,5,5-trimethylhexyl.

[0019] As the component (a), a sulfosuccinic acid branched alkyl ester represented by the following general formula (al) can be exemplified.

[0020]

[0021] (In the formula, R 1a , R 2a are each independently a branched alkyl group having 8 or more and 13 or less carbon atoms. A 1 , A 2 are each independently an alkylene group having 2 or more and 4 or less carbon atoms, x, y are each independently an average addition mole number, and are each independently 0 or more and 6 or less. M 1 is a hydrogen atom or a cation. )

[0022] Further, as the component (a), a sulfosuccinic acid branched alkyl ester represented by the following general formula (al-1) can be exemplified. This compound is a compound in which x = 0 and y = 0 in the general formula (al).

[0023]

[0024] (In the formula, R 1a , R 2a are each independently a branched alkyl group having 8 or more and 13 or less carbon atoms. M 1 is a hydrogen atom or a cation. )

[0025] The following description can be applied to the general formula (al) and the general formula (al-1) respectively.

[0026] The carbon atom number of R 1a , R 2a may be the same or different.

[0027] In the present application, the hydrocarbon residue from which the hydroxyl group is removed from a secondary alcohol is included in a chain branched hydrocarbon group.

[0028] In the present application, in the chain branched hydrocarbon group of R 1a , R 2a , the hydrocarbon chain having the largest number of carbon atoms counted from the carbon atom bonded to the oxygen atom is taken as a main chain, and the hydrocarbon chain bonded to branch from the main chain is taken as a side chain.

[0029] When it can be considered that there are two or more main chains, that is, when there are two or more hydrocarbon chains having the largest number of carbon atoms (hereinafter also referred to as the longest hydrocarbon chain), the main chain is determined in the following order.

[0030] 1. The side chain having a larger number of carbon atoms branching from the longest hydrocarbon chain is regarded as the main chain.

[0031] 2. Next, in the case where the number of carbon atoms of the side chain branching from the longest hydrocarbon chain is the same, the side chain having a larger number of side chains branching from the longest hydrocarbon chain is regarded as the main chain.

[0032] 3. Next, in the case where the number of side chains branching from the longest hydrocarbon chain is the same, the side chain having a side chain on a carbon atom closer to the oxygen atom, counted from the carbon atom bonded to the oxygen atom, is regarded as the main chain.

[0033] 4. Next, in the case where the position of the carbon atom having a side chain closest to the oxygen atom is the same, the side chain having a larger number of carbon atoms closest to the oxygen atom is regarded as the main chain.

[0034] Further, in the case where two or more longest hydrocarbon chains have the same symmetrical structure, either one can be the main chain.

[0035] In R 1a , R 2a , the total number of carbon atoms of the chain branched alkyl group can be the same or different, and from the viewpoint of inhibiting adsorption of the oily component to the hydrophobic surface, is 8 or more, preferably 9 or more, and is 13 or less, preferably 11 or less, more preferably 10 or less.

[0036] In R 1a , R 2a , the number of carbon atoms constituting the main chain can be the same or different, and from the viewpoint of inhibiting adsorption of the oily component to the hydrophobic surface, is preferably 6 or 7.

[0037] In R 1a , R 2a , the total number of carbon atoms constituting the side chain can be the same or different, and from the viewpoint of inhibiting adsorption of the oily component to the hydrophobic surface, is 2 or more, preferably 3 or 4.

[0038] In the present application, the total number of carbon atoms constituting the side chain means the value obtained by adding up the number of carbon atoms of all the side chains other than the main chain in one branched alkyl group, and in the case where there are a plurality of side chains, the total number of carbon atoms of all the side chains.

[0039] R 1a , R 2aThe number of side chains can be the same or different, and is preferably 1 or more and 3 or less from the viewpoint of suppressing adsorption of the oily component to the hydrophobic surface, and in the case where the number of carbon atoms of the side chain is 2 or more, the number of side chains is preferably 1, and in the case where the number of carbon atoms of the side chain is 1, the number of side chains is preferably 2 or more and 3 or 4.

[0040] In the present application, the number of side chains refers to the number of side chains branched from the main chain, and even if the side chain has a side chain branched therefrom, the number of side chains does not change. However, from the viewpoint of suppressing adsorption of the oily component to the hydrophobic surface, the side chain can have a side chain branched therefrom.

[0041] R 1a , R 2a The number of branched carbons can be the same or different, and is preferably 1 or more and 3 or less from the viewpoint of suppressing adsorption of the oily component to the hydrophobic surface, and is more preferably 2 or less.

[0042] In the present application, the number of branched carbons refers to the total number of tertiary carbon atoms and quaternary carbon atoms in the chain branched alkyl group.

[0043] R 1a , R 2a The preferable mode of R 1a , R 2a The total number of carbon atoms of the chain branched alkyl group of R

[0044] R 1a , R 2a The specific branched alkyl group of R

[0045] In general formula (al), A 1 , A 2 are each independently an alkylene group having 2 or more and 4 or less, preferably 3 or less, carbon atoms.

[0046] In general formula (al), x and y are the average addition mole number, and are each independently preferably 0 or more and 6 or less, more preferably 4 or less, further more preferably 2 or less, and further more preferably 0, from the viewpoint of suppressing adsorption of the oily component to the hydrophobic surface.

[0047] Furthermore, from the viewpoint of suppressing the adsorption of oily components onto hydrophobic surfaces, x+y is preferably 0 or more, more preferably 12 or less, more preferably 6 or less, even more preferably 3 or less, and even more preferably 0.

[0048] M 1 The cation is a hydrogen ion, or an inorganic cation such as sodium ion, ammonium ion, potassium ion, magnesium ion, or an organic cation such as monoethanol ammonium ion, diethanol ammonium ion, triethanol ammonium ion, or morpholinium ion. It is preferably a cation selected from sodium ion, ammonium ion, potassium ion, magnesium ion, and monoethanol ammonium ion, more preferably an inorganic cation selected from sodium ion and potassium ion, and even more preferably a sodium ion.

[0049] As R 1a R 2a The preparation method of the same compound is not particularly limited; for example, it can be prepared by referring to the method described in U.S. Patent No. 2,028,091. Furthermore, as R... 1a R 2a Different methods for preparing asymmetric compounds can be found, for example, by referring to Japanese Patent Application Publication No. 58-24555. As a raw material for component (a), a compound formed by adding an epoxide to an alcohol with a specified number of carbon atoms can also be used.

[0050] Suitable alcohols that can be used in the manufacture of component (a) of the present invention can be listed as follows:

[0051] (1) Primary alcohols, represented by 2-ethylhexanol, 3,5,5-trimethylhexane-1-ol, and 2-propylheptane-1-ol,

[0052] (2) Secondary alcohols, such as 5-nonanol and 2,6-dimethyl-4-heptanol.

[0053] In this invention, by using component (a), it is possible to provide an antifouling agent with excellent inhibition of the adsorption of oily components onto hydrophobic surfaces.

[0054] The object to be treated (the object to be treated) by the antifouling agent of the present invention is not particularly limited, but hard articles are preferred, and hard articles with hydrophobic surfaces are even more preferred. Examples of objects to be treated include articles made of glass, metal, resin, etc.

[0055] The hydrophobic surface can mean a surface of which the critical surface energy with respect to dirt is 50 mN / m or less. In addition, the hydrophobic surface can be a surface coated with a polymer or the like. Specifically, it is known that the surface energy of, for example, polyethylene is 35 mN / m, that of polypropylene is 21.0 to 28.5 mN / m, and that of polystyrene is 44 mN / m (Physical Chemistry of Polymer Surface, Vol. 17, No, 196, 1968, 680-687), and the present application can effectively impart the antifouling effect to a hydrophobic surface having such a surface energy.

[0056] The antifouling agent of the present application is suitable as an antifouling agent for a bath, a sink, a washing tub, tableware, cookware, and the like, and is more suitable as an antifouling agent for tableware, and further for preventing the attachment of oil dirt (solid fat or the like) to tableware. In addition, if the antifouling agent of the present application is used as an antifouling agent when tableware is washed with an automatic dishwashing machine, it is possible to prevent the reattachment of oil dirt to tableware having a hydrophobic surface and the attachment of oil dirt in the cabinet of the automatic dishwashing machine, and is thus preferred. In addition, the antifouling agent of the present application can also be contained in a liquid detergent composition for an automatic dishwashing machine.

[0057] The antifouling agent of the present application can suppress the attachment of sebum dirt or the like to a bath tub by being contained in, for example, a detergent or a bath additive for the bath tub. In addition, the antifouling agent of the present application can suppress the attachment of dirt components in a pipe by being contained in a fluid flowing in the pipe.

[0058] In the case where the antifouling agent of the present application is used for tableware, the effect of the present application can be obtained by containing the antifouling agent in any one of a treatment liquid before, during, or after the washing of tableware, and it is possible to suppress the reattachment of dirt components (for example, oil dirt such as solid fat or liquid oil) to tableware.

[0059] The concentration of the (a) component at the time of use of the antifouling agent of the present application is preferably 1 ppm (on a mass basis, the same applies hereinafter) or more, more preferably 10 ppm or more, and further more preferably 20 ppm or more, from the viewpoint of suppressing the adsorption of oily components to a hydrophobic surface, and is preferably 500 ppm or less, more preferably 300 ppm or less, and further more preferably 200 ppm or less.

[0060] In the present application, the description of the amount of the (a) component (ppm or mass %) is based on the mass of the compound converted to a sodium salt, for example, based on the mass of M 1 assuming the mass of sodium.

[0061] It is known that a general surfactant has a surface activity at a concentration of 1 cmc or more. In the general formula (al-1) of one embodiment of the (a) component of the present application, R1a 2a In the case of the compound in which R is 2-propylheptyl, the cmc (measured using pure water) of the compound is about 500 ppm, but as shown in the examples described later, the compound has an excellent antifouling effect even at a concentration lower than the cmc of the compound, which is unexpected. Therefore, the concentration of the (a) component at the time of use of the antifouling agent of the present application can be lower than the cmc of the (a) component. In the present application, the cmc is the value at which equilibrium is reached using a surface tension measurement method. The cmc can also be the equilibrium value at 25°C and atmospheric pressure (1013 hPa).

[0062] The antifouling agent of the present application can also contain any component other than the (a) component within a range that does not impair the effects of the present application. As the any component, components such as surfactants, solvents, cosolvents, dispersants, pH adjustors, tackifiers, viscosity adjustors, perfumes, colorants, antioxidants, preservatives, foam suppressors, bleaching agents, bleaching activators, and the like (but not components equivalent to the (a) component) can be incorporated.

[0063] The antifouling agent of the present application can be produced by mixing a prescribed amount of the (a) component and water. At this time, the precursor composition containing the (a) component is diluted with water, and the antifouling agent composition of the present application can be obtained. For example, such dilution can be performed immediately before use of the antifouling agent of the present application, and the antifouling agent of the present application can be prepared. As the precursor composition, for example, a composition containing the (a) component at preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and at preferably 5% by mass or less, more preferably 3% by mass or less, and further containing water can be exemplified.

[0064] The pH of the antifouling agent of the present application at 25°C is preferably 2 or more, more preferably 4 or more, and even more preferably 5 or more, and is preferably 10 or less, more preferably 9 or less, and even more preferably 8 or less, from the viewpoint of the irritancy to the skin of the hand. Furthermore, the pH can be measured using a glass electrode method.

[0065] The viscosity of the antifouling agent of the present application at 25°C is preferably 3 mPa-s or more, more preferably 10 mPa-s or more, and is preferably 5,000 mPa-s or less, more preferably 2,500 mPa-s or less, although it also depends on the use and the like. The viscosity can be adjusted using a tackifier, a solvent, a cosolvent, and the like that are generally used.

[0066] In the present application, a method in which the antifouling agent of the present application is diluted with water to 10 times or more and less than 10,000 times, and preferably 50 times or more and less than 5,000 times, and an antifouling agent composition (treatment liquid) is prepared for the treatment of the treated object is preferred.

[0067] ​The present application provides use of a branched alkyl sulfosuccinic acid ester in which the branched alkyl group is a branched alkyl group having 8 or more and 13 or less carbon atoms (component (a)) as an antifouling agent.

[0068] The present application provides use of component (a) as an antifouling agent for a hydrophobic surface.

[0069] The present application provides use of component (a) as an antifouling agent for preventing attachment of oil stains to a hydrophobic surface.

[0070] These matters described in the antifouling agent of the present application can be appropriately applied to the use.

[0071] <Antifouling method>

[0072] The present application provides an antifouling method in which a treatment liquid containing component (a) is brought into contact with a treated object. The treated object is an article which is a treatment target of the antifouling agent of the present application.

[0073] The treatment liquid of the present application can be obtained by mixing the antifouling agent of the present application with water. In addition, the treatment liquid of the present application can be obtained by diluting a precursor composition containing component (a) described above with water. In addition, the treatment liquid of the present application can also directly use the antifouling agent of the present application.

[0074] The matters described in the antifouling agent of the present application can be appropriately applied to the antifouling method of the present application. The specific examples, preferred modes, and the treatment target of component (a) in the antifouling method of the present application are the same as those of the antifouling agent of the present application.

[0075] The treatment target of the antifouling method of the present application is preferably the surface of a hard article, and preferably a hard article having a hydrophobic surface. The treatment target of the antifouling method of the present application can be, for example, a hydrophobic surface of tableware or the like. In addition, as an object to be antifouled, for example, it can be a bath, a pipe, a medical instrument, or an optical instrument, or the like. In the present application, when tableware is washed using an automatic dishwashing machine, it is further preferable to use the tableware on which an oil stain further containing solid fat is attached as a treatment target to be antifouled at the time of washing the tableware.

[0076] The automatic dishwashing machine can be any one of a household automatic dishwashing machine and a work automatic dishwashing machine, as long as it is a generally marketable automatic dishwashing machine.

[0077] The washing conditions are not particularly limited, and the washing temperature, the washing time, and the like can be performed according to the publicly known washing conditions using an automatic dishwashing machine.

[0078] From the viewpoint of inhibiting adsorption of the oily component to the hydrophobic surface, the treatment liquid of the present application contains the (a) component preferably at 1 ppm or more, more preferably at 10 ppm or more, further more preferably at 20 ppm or more, and preferably at 500 ppm or less, more preferably at 300 ppm or less, further more preferably at 200 ppm or less. The treatment liquid of the present application can contain the (a) component at a concentration lower than the cmc of the (a) component.

[0079] The treatment liquid of the present application has a pH preferably at 2 or more, more preferably at 4 or more, further more preferably at 5 or more, and preferably at 10 or less, more preferably at 9 or less, further more preferably at 8 or less, from the viewpoint of the stimulation to the hand skin. The pH is the pH at the cleaning temperature.

[0080] The cleaning temperature of the cleaning method of the present application is preferably at 40°C or more, more preferably at 50°C or more, from the viewpoint of the cleaning property, and is preferably at 80°C or less, more preferably at 70°C or less, from the viewpoint of the cleaning property and the productivity. The cleaning temperature can be the temperature of the cleaning liquid of the present application.

[0081] The content of the (a) component, the cleaning time, and the cleaning temperature described above are, for example, conditions also applicable to the case of cleaning tableware with an automatic tableware cleaning machine.

[0082] After the tableware is cleaned with the automatic tableware cleaning machine, the tableware is usually rinsed with water, warm water, or hot water, for example, hot water at 70°C or more and 90°C or less, for 5 seconds or more and 15 seconds or less, quickly with the same automatic tableware cleaning machine.

[0083] The method of contacting the antifouling agent of the present application with the object to be treated is not particularly limited, and can be performed by coating, dipping, spraying, or the like. When the object to be treated is dipped in the treatment liquid containing the antifouling agent of the present application, a mechanical force such as stirring, shaking, water flow, or a tool such as a brush or a sponge used in general cleaning can be applied.

[0084] Examples

[0085] The following (a) component or (a') component was dissolved in water of 3.5°DH to prepare the treatment liquids shown in Tables 1 to 3. The (a') component is a comparative component of the (a) component. In addition, the pH of the treatment liquid was measured by a glass electrode method. The cmc is the value at 25°C, in pure water, at pH 7, under atmospheric pressure.

[0086] (a) Component

[0087] The number of carbon atoms of a branched alkyl group is indicated in parentheses. a-1 is a branched alkyl sulfosuccinate synthesized using a branched alcohol commercially available as isalchem 123 (manufactured by SASOL).

[0088] • a-1 sodium di(carbon atoms 12 / carbon atoms 13, branched alkyl) sulfosuccinate (each of the alkyl groups has 12 or 13 carbon atoms)

[0089] • a-2 sodium di(2-propylheptyl) sulfosuccinate (one alkyl group has 10 carbon atoms), cmc: about 500 ppm

[0090] • a-3 sodium di(3,5,5-trimethylhexyl) sulfosuccinate (each of the alkyl groups has 9 carbon atoms), cmc: about 600 ppm

[0091] • a-4 sodium di(2-ethylhexyl) sulfosuccinate (each of the alkyl groups has 8 carbon atoms), cmc: about 1100 ppm

[0092] (a') component

[0093] • a'-1 sodium di(1,3-dimethylbutyl) sulfosuccinate (each of the alkyl groups has 6 carbon atoms), cmc: 3000 ppm or more

[0094] • a'-2 sodium dodecyl sulfate, cmc: about 2800 ppm

[0095] • a'-3 sodium 1-dodecylsulfate, cmc: about 3000 ppm

[0096] • a'-4 sodium laurate, cmc: about 6000 ppm

[0097] • a'-5 polyoxyethylene lauryl ether (trade name EMULGEN 106, manufactured by Kao Corporation), average addition mole number of ethyleneoxy group 5, cmc: about 20 ppm

[0098] • a'-6 7EO adduct of secondary alcohol having 12 or more and 14 or less carbon atoms (trade name SOFTANOL 70, manufactured by Nippon Shokubai Co., Ltd.), EO represents ethyleneoxy group. cmc: about 40 ppm

[0099] (1) Antifouling evaluation 1

[0100] To 300 mL of a treatment liquid of the composition shown in Table 1, a clean polypropylene plate (8 cm x 3 cm, surface energy 26 mN / m) was added while stirring the treatment liquid, and 0.5 g of liquid paraffin was added. After 60 seconds from the addition of the liquid paraffin, the plate was lifted and dried, and the mass of the plate to which liquid paraffin was adhered was measured. The amount of oil adhered (mg / cm 2 ) was calculated as the increase in the mass of the plate before the addition of the treatment liquid and after the adhesion of the liquid paraffin, divided by the area of the front and back surfaces of the plate. The results are shown in Table 1.

[0101] (2) Evaluation of Antifouling

[0102] To a polypropylene plate, 1 μL of triolein was adhered, and the plate to which triolein was adhered was immersed in a treatment liquid of the composition shown in Table 2. The treatment liquid was warmed to 50°, and the contact angle of the triolein was measured. The results are shown in Table 2. From the results of Table 2, it is known that a high contact angle can be obtained by bringing a treatment liquid containing an antifouling agent into contact with a polypropylene plate. From this result, it is considered that the antifouling agent of the present application reduces the solid-liquid surface energy on a hydrophobic surface, and it is difficult for oil stains such as liquid oil to be adsorbed to the hydrophobic surface.

[0103] In particular, it is known that a treatment liquid containing the antifouling agent of the present application can obtain an antifouling effect even if it is a very dilute solution of a concentration lower than the cmc.

[0104]

[0105] [Table 2]

[0106]

[0107] (3) Evaluation of Antifouling

[0108] A clean polypropylene plate (8 cm x 3 cm) was immersed in a treatment liquid of the composition shown in Table 3 for 1 minute. After the plate was lifted from the treatment liquid, the portion of the plate 3 cm from the lower end was immersed in triolein and immediately lifted, and the amount of oil adhered to the portion immersed in triolein (mg / cm 2 ) was calculated. Specifically, the mass of the oil adhered to the plate was calculated from the difference in the mass of the plate before the immersion in triolein and after the immersion, and the amount of oil adhered (mg / cm 2 ) was calculated by dividing the mass of the oil by the area of both surfaces of the plate (3 cm x 3 cm x front and back). The results are shown in Table 3. From this result, it is considered that by previously treating a hydrophobic surface with the antifouling agent of the present application, it is difficult for oil stains such as liquid oil to be adhered to the hydrophobic surface.

[0109] [Table 3]

[0110]

Claims

1. The use of the sulfosuccinic acid branched alkyl ester of the following general formula (a1-1) as component (a) in an antifouling agent to prevent oil from adhering to hydrophobic surfaces, wherein, In the formula, R 1a R 2a M is an independently branched alkyl group having a main chain with 6 or 7 carbon atoms and one or more side chains with a total of 3 or 4 carbon atoms in the side chains. 1 It can be a hydrogen atom or a cation.

2. A method for preventing contamination, wherein, A treatment solution containing a branched alkyl sulfosuccinate of the following general formula (a1-1) as component (a) at a concentration of 1 ppm to 500 ppm is brought into contact with a workpiece having a hydrophobic surface. Component (a) is adsorbed onto the hydrophobic surface, preventing oil from adhering to the hydrophobic surface. In the formula, R 1a R 2a M is an independently branched alkyl group having a main chain with 6 or 7 carbon atoms and one or more side chains with a total of 3 or 4 carbon atoms in the side chains. 1 It can be a hydrogen atom or a cation.

3. The antifouling method as described in claim 2, wherein, In general formula (a1-1), R 1a R 2a The number of branched carbons is independently between 1 and 3.

4. The antifouling method as described in claim 2, wherein, In general formula (a1-1), R 1a R 2a Each is an independently branched alkyl group having 9 or 10 carbon atoms, 6 or 7 carbon atoms in the main chain, 3 carbon atoms in the side chain, and 1 to 3 side chains.

5. The antifouling method as described in claim 2, wherein, In general formula (a1-1), M 1 It is an inorganic cation.

6. The antifouling method according to any one of claims 2 to 5, wherein, The treatment solution contains component (a) at a concentration lower than that of component (a) in cmc.

7. The antifouling method according to any one of claims 2 to 5, wherein, (a) The branched alkyl group of the component is selected from 2-propylheptyl and 3,5,5-trimethylhexyl.

8. The antifouling method according to any one of claims 2 to 5, wherein, The pH of the treatment solution is above 2 and below 10.

9. The antifouling method according to any one of claims 2 to 5, wherein, The temperature of the treatment liquid is above 40°C and below 80°C.

10. The antifouling method according to any one of claims 2 to 5, wherein, The contact between the treatment liquid and the object being treated is achieved by coating, impregnation, or spraying.

11. The antifouling method as described in claim 2, wherein, The critical surface energy of a hydrophobic surface in contact with dirt is below 50 mN / m.

12. The antifouling method according to any one of claims 2 to 5, wherein, The object being processed is an article made of glass, metal or resin.

13. The antifouling method according to any one of claims 2 to 5, wherein, The items being processed are bathroom fixtures, sinks, washing tubs, or tableware and cooking utensils.

14. The antifouling method according to any one of claims 2 to 5, wherein, The treatment solution is prepared from a bath cleaning agent or bath additive containing component (a), and by using the treatment solution, the adhesion of sebum and dirt to the bath is inhibited.

15. The antifouling method according to any one of claims 2 to 5, wherein, The items being processed are tableware.

16. The antifouling method according to any one of claims 2 to 5, wherein, Use an automatic dishwashing machine to bring the treatment solution into contact with the food being treated.

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