JP2017075247A - Detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detergent composition having high ability to remove a fine particle and the like after polishing treatment using an abrasive.SOLUTION: A detergent composition has aliphatic hydrocarbon (A), anionic surfactant (B), and water (C), with a content of the aliphatic hydrocarbon (A) of 60.0-85.0 mass%, a content of the anionic surfactant (B) of 10.0-15.0 mass%, and a content of the water (C) of 1.0-15.0 mass%, wherein the detergent composition has pH of less than 1.5 and forms W/O microemulsion or solubilizable W/O emulsion.SELECTED DRAWING: None

Description

  The present invention relates to a cleaning composition, in particular, parts handled in various industrial fields such as automobiles, machines, precision equipment, electricity, electronics, optics, piping and devices of various factories such as oil refineries and chemical plants, automobiles, The present invention relates to a cleaning composition used for cleaning parts disassembled from industrial machinery and the like, and metal products used in daily life.

  Parts (hereinafter referred to as “parts”) handled in various industrial fields such as automobiles, machines, precision equipment, electricity, electronics, optics, etc. (i) water-insoluble, mainly composed of mineral oil, during processing Processing oil, (ii) water-soluble processing oil obtained by adding a surfactant to mineral oil and emulsifying in water, (iii) fine particles such as abrasives, and the like are used. In particular, a lot of water-soluble processing oil is used mainly for cutting and grinding, and parts manufactured through multiple processing steps have low polarity because the processing oil used for each step varies. In many cases, various stains ranging from high polarity to high polarity are attached.

  A cleaning agent composed of water, a solvent, and a surfactant has been developed for the purpose of cleaning parts having a mixture of various types of dirt from low polarity to high polarity. 1-3). The W / O microemulsion-type cleaning agent described in Patent Documents 1 to 3 enables cleaning of a wide range of dirt such as low polarity dirt and high polarity dirt.

  However, even with the W / O microemulsion-type cleaning agent described in Patent Documents 1 to 3, buffing using an abrasive that is performed for the purpose of deburring, smoothing, rounding, and polishing of parts after molding. In addition, the smut, which is a composite of fine particles and organic matter adhering to the parts after barrel polishing, could not be sufficiently cleaned. Further, it has not been possible to sufficiently clean a smut in which a decomposed product, a modified product, a carbide, a wear metal powder, or the like of an additive adhering to a part after pressing is combined.

  On the other hand, for the purpose of cleaning parts after polishing, etc., a surface treatment method for a magnesium alloy member (for example, see Patent Document 4) and a metal surface treatment agent (for example, see Patent Document 5) have been proposed. Also in these inventions, the cleaning property of the processing oil that can be adhered in other steps is insufficient, and the smut that adheres in the polishing step is not sufficiently removable.

JP 09-157698 A JP2013-117008A JP, 2014-214228, A Japanese Patent Laying-Open No. 2005-256064 JP 09-67600 A

  This invention is made | formed in view of the above, Comprising: It aims at providing the cleaning composition excellent in the removability of the smut containing the microparticles | fine-particles etc. after the grinding | polishing process using an abrasive | polishing agent.

  In order to solve the above-described problems and achieve the object, the cleaning composition of the present invention includes an aliphatic hydrocarbon (A), an anionic surfactant (B), and water (C). The aliphatic hydrocarbon (A) is 60.0 to 85.0% by mass, the anionic surfactant (B) is 10.0 to 15.0% by mass, and the water (C) is 1.0 to It is contained at a ratio of 15.0% by mass, has a pH of less than 1.5, and forms a W / O microemulsion or a solubilized W / O emulsion.

  The cleaning composition of the present invention includes an aliphatic hydrocarbon (A), an anionic surfactant (B), water (C), and a nonionic surfactant (D). The aliphatic hydrocarbon (A) is 60.0-85.0% by mass, the anionic surfactant (B) is 8.0-15.0% by mass, and the water (C) is 1.0-20. 0.0% by mass, containing the nonionic surfactant (D) in a proportion of 2.0 to 5.0% by mass, having a pH of less than 1.5, and a W / O microemulsion or solubilized type It is characterized by forming a W / O emulsion.

  Moreover, in the said invention, the cleaning composition of this invention contains 10.0-20.0 mass% in total with the said anionic surfactant (B) and the said nonionic surfactant (D). The anionic surfactant (B) and the nonionic surfactant (D) are blended in a ratio (mass ratio) of 2.0 to 5.0: 1.

  Further, in the cleaning composition of the present invention, in the above invention, the anionic surfactant (B) is a dialkylsulfosuccinic acid ester salt, and the nonionic surfactant (C) is a sorbitan fatty acid ester. It is characterized by.

  In the cleaning composition of the present invention, the aliphatic hydrocarbon (A) is a paraffinic hydrocarbon or an olefinic hydrocarbon having 9 to 13 carbon atoms.

  Moreover, the cleaning composition of the present invention is characterized in that, in the above-mentioned invention, the saturated water content measured by turbidity is 10% by mass or more.

  Moreover, in the said invention, the cleaning composition of this invention is characterized by not containing a polar solvent.

  In the above invention, the cleaning composition of the present invention is used for cleaning fine particles after polishing treatment.

  In the above invention, the cleaning composition of the present invention is used for cleaning fine particles after press working.

  The cleaning composition of the present invention is characterized in that, in the above-mentioned invention, it is used for pretreatment cleaning in a diamond-like carbon coating process.

  The cleaning composition according to the present invention comprises an aliphatic hydrocarbon (A), an anionic surfactant (B), and water (C) at a predetermined ratio, and the inorganic oxide fine particles derived from the abrasive are The pH is adjusted so that it can be stably dispersed, and a W / O microemulsion or a solubilized W / O emulsion that dissolves organic substances quickly is formed. It becomes.

  When processing parts used in various industrial fields such as automobiles, machinery, precision machinery, electricity, electronics, optics, etc., water-insoluble processing oils mainly composed of mineral oils, mineral oils, etc., containing a surfactant Fine processing oil, abrasives and other fine particles are used, and various stains adhere to the object to be cleaned.

  In recent years, in order to improve the durability of articles such as automobile parts and tools, PVD (Physical Vapor Deposition) coating processing such as DLC (Diamond Like Carbon) coating has been performed, but before PVD coating processing, There are processes such as grinding, forging, electric discharge, polishing and rust prevention, and various stains adhere to the article in these processes. A detergent composition comprising a W / O microemulsion or a solubilized W / O emulsion in which water and a surfactant are blended in a solvent (hereinafter also referred to as “W / O microemulsion type detergent”) is polar. Various types of dirt can be washed from high dirt to low dirt, but the cleaning performance of dirt adhering to parts after buffing or barrel polishing and dirt adhering to press processing using water-insoluble processing oil is sufficient. I couldn't.

  The polishing agent used in the polishing step such as buff polishing is obtained by solidifying a fine powder for polishing such as silica, alumina, cerium oxide or the like, fine powder for polishing such as diamond, an auxiliary agent and a lubricating oil component with wax. Since the abrasive is attached to the part in a state where each component is oxidized or carbonized by heat generated in the polishing process and dried, it is difficult to clean, and cleaning becomes more difficult as time passes.

  On the other hand, water-insoluble processing oil used in press processing is a product obtained by dissolving additives such as oiliness agent and extreme pressure agent in mineral oil. If the product becomes contaminated with a mixture of a modified material, a carbide, a worn metal powder, and the like, and adheres to a part, the cleaning cannot be performed sufficiently.

  Dirt (hereinafter referred to as “smut”) adhering to parts in the polishing process or pressing process is a composite of inorganic oxide particles and organic matter. To remove this, the cleaning agent dissolves the organic matter. The function of dispersing the inorganic oxide particles is required.

  The conventional W / O microemulsion-type cleaning agent can dissolve the organic substance derived from the polishing agent in the oil layer, but the dispersibility of the inorganic oxide particles is not sufficient, or the cleaning property of the smut after the polishing treatment is poor. It was low. In addition, the conventional W / O microemulsion-type cleaning agent can dissolve organic substances derived from water-insoluble press oil in the oil layer, but the dispersibility of carbides and wear metal powders may be insufficient. In some cases, the smut was not cleanable.

  In order to improve the detergency of the smut, the present inventors paid attention to the electrokinetic potential (hereinafter referred to as zeta potential) of the inorganic oxide particles. In general, it is known that the zeta potential of inorganic oxide particles varies greatly with pH. For example, alumina sol is positively charged at low pH and negatively charged at high pH. Therefore, by adjusting the pH of the cleaning composition, the zeta potential of the inorganic oxide particles contained in the smut is positively or negatively charged to suppress aggregation of the inorganic oxide particles and stable in the cleaning agent. The present invention has been completed through intensive studies based on the assumption that it can be dispersed in an efficient manner.

  The cleaning composition according to the first embodiment of the present invention includes an aliphatic hydrocarbon (A), an anionic surfactant (B), and water (C), and the aliphatic hydrocarbon. 60.0-85.0 mass% of (A), 10.0-15.0 mass% of said anionic surfactant (B), and 1.0-15.0 mass% of said water (C). It is contained in a proportion and has a pH of less than 1.5 and is characterized by forming a W / O microemulsion or a solubilized W / O emulsion.

  The cleaning composition according to the first embodiment of the present invention is a mixture of aliphatic hydrocarbon (A), anionic surfactant (B), and water (C) in a predetermined ratio. Dissolve organic matter in smut quickly. Further, by setting the pH to less than 1.5, the smut cleaning ability is improved. This is because the zeta potential of the inorganic oxide particles in the smut is positively charged by contact with the cleaning composition, and the aggregation of the inorganic oxide particles is suppressed, that is, the dispersibility of the inorganic oxide particles is improved. it is conceivable that. Although the stability of the W / O microemulsion or the solubilized W / O emulsion varies depending on the pH, the cleaning composition of the present invention is stable even when the pH is less than 1.5. A smut that is a W / O emulsion and that is difficult to clean, in which organic matter and inorganic oxide particles are combined, can be cleaned. Moreover, there exists a secondary effect which can melt | dissolve an inorganic oxide particle by setting pH to less than 1.5.

Hereinafter, the components of the cleaning composition according to the first embodiment of the present invention will be described.
The aliphatic hydrocarbon (A) used in the cleaning composition according to the first embodiment of the present invention preferably has 9 to 13 carbon atoms. When the carbon number of the aliphatic hydrocarbon (A) is less than 9, the flash point of the cleaning composition is lowered, and the risk of ignition is increased. Moreover, when carbon number becomes larger than 14, the viscosity of a cleaning composition will become high and there exists a possibility that cleaning efficiency may fall. The aliphatic hydrocarbon (A) preferably has 10 to 13 carbon atoms, particularly preferably 10 to 12 carbon atoms.

  The aliphatic hydrocarbon (A) is preferably a paraffinic hydrocarbon or an olefinic hydrocarbon. The aliphatic hydrocarbon (A) is preferably a paraffinic hydrocarbon or an olefinic hydrocarbon because a stable W / O microemulsion or a solubilized W / O emulsion can be formed.

  Examples of the aliphatic hydrocarbon (A) according to the first embodiment of the present invention include normal heptane, normal octane, normal nonane, normal decane, normal undecane, normal dodecane, normal tridecane, normal tetradecane, and normal pentadecane. Normal paraffin hydrocarbons such as isoheptane, isooctane, isononane, isodecane, isoundecane, isododecane, isotridecane, isotetradecane, isopentadecane, and other isoparaffin hydrocarbons, cyclohexane, methylcyclohexane, dimethylcyclohexane, trimethylcyclohexane, tetramethylcyclohexane, Ethylcyclohexane, propylcyclohexane, butylcyclohexane, pentylcyclohexane, bicyclohexyl, decali Cycloparaffinic hydrocarbons such as methyl decalin, dimethyl decalin, ethyl decalin, normal heptene, normal octene, normal nonene, normal decene, normal undecene, normal dodecene, normal tridecene, normal tetradecene, normal pentadecene, isoheptene, isooctene Olefinic carbon such as isononene, isodecene, isoundecene, isododecene, isododecene, isotridecene, isotetradecene, isopentadecene, cyclohexene, methylcyclohexene, dimethylcyclohexene, trimethylcyclohexene, tetramethylcyclohexene, ethylcyclohexene, propylcyclohexene, butylcyclohexene, pentylcyclohexene Hydrogen can be used. These may be used alone or in combination of two or more. Among these, normal decane, normal undecane, normal dodecane, isodecane, isoundecane, and isododecane are preferable in terms of achieving both safety and washing efficiency.

  In the cleaning composition according to the first embodiment of the present invention, the blending amount of the aliphatic hydrocarbon (A) is 60.0 to 85.0 mass%. When the blending amount of the aliphatic hydrocarbon (A) is less than 60.0% by mass, the detergency with respect to low polarity dirt may be deteriorated. Detergency may be reduced. It is preferable that the compounding quantity of an aliphatic hydrocarbon (A) is 75.0-80.0 mass%.

  The anionic surfactant (B) used in the cleaning composition according to the first embodiment of the present invention can be appropriately selected according to the purpose. For example, petroleum sulfonate, funnel oil, etc. Examples thereof include sulfonates, sulfates, carboxylates and the like.

  Among them, as the sulfonate, a hydrocarbon sulfonate having 8 to 22 carbon atoms is preferable. As the sulfate ester salt, a sulfated oil having 8 to 18 carbon atoms and an alkyl sulfate ester salt having 8 to 18 carbon atoms are preferable. Examples of carboxylates include dialkylsulfosuccinic acid ester salts having 6 to 13 carbon atoms in the alkyl group, alkyl disalts having 6 to 13 carbon atoms, and polyoxyethylene alkylsulfosuccinic acid having 6 to 13 carbon atoms in the alkyl group. Acid disalts are preferred. The anionic surfactant (B) is preferable because it can form a stable W / O microemulsion or a solubilized W / O emulsion. In particular, dialkylsulfosuccinic acid ester salts having 6 to 13 carbon atoms of alkyl groups such as sodium di (2-ethylhexyl) sulfosuccinate form more stable W / O microemulsions or solubilized W / O emulsions. Therefore, it is preferably used.

  In addition, as the sulfonate used as the anionic surfactant (B), it is preferable to use a substance other than the alkylbenzene sulfonate because it reduces the influence on the environment and facilitates management.

  Examples of the surfactant salt used as the anionic surfactant (B) include alkali metal salts, alkaline earth metal salts, ammonium salts, and alkanolamine salts having 1 to 5 carbon atoms. Acid forms such as sulfuric acid esters and carboxylic acids can also be used. The surfactants exemplified above may be used alone or in combination of two or more.

  In the cleaning composition according to the first embodiment of the present invention, the amount of the anionic surfactant (B) is 10.0 to 15.0% by mass. If the amount of the anionic surfactant (B) is less than 10.0% by mass, the detergency with respect to highly polar soils may be deteriorated. There is a possibility that the cleaning property against the water may be reduced. It is preferable that the compounding quantity of an anionic surfactant (B) is 11.0-15.0 mass%.

  As the water (C) used in the cleaning composition according to the first embodiment of the present invention, distilled water, ion-exchanged water, or the like can be used. The compounding quantity of water (C) is 1.0-15.0 mass%. When the blending amount of water (C) is less than 1.0% by mass, the detergency with respect to highly polar stains may be reduced. May decrease. The blending amount of water (C) is preferably 5.0 to 15.0 mass%, particularly preferably 5.0 to 10.0 mass%.

  In addition, the cleaning composition according to the second embodiment of the present invention includes an aliphatic hydrocarbon (A), an anionic surfactant (B), water (C), and a nonionic surfactant. (D), 60.0-85.0 mass% of the aliphatic hydrocarbon (A), 8.0-15.0 mass% of the anionic surfactant (B), the water ( C) is contained in an amount of 1.0 to 20.0% by mass, the nonionic surfactant (D) is contained in an amount of 2.0 to 5.0% by mass, and the pH is less than 1.5. / O microemulsion or solubilized W / O emulsion.

  The aliphatic hydrocarbon (A), the anionic surfactant (B), and water (C) used in the cleaning composition according to the second embodiment of the present invention are used in the first embodiment. Similar to those to be used can be used.

  The cleaning composition according to the second embodiment of the present invention contains a nonionic surfactant (D). By blending the nonionic surfactant (D), it is possible to improve the detergency against dirt such as processing oil and wax. In addition, by using the anionic surfactant (B) and the nonionic surfactant (D) in combination, it becomes possible to increase the amount of water in the cleaning composition, and to prevent high-contamination stains. Detergency can be improved.

  The nonionic surfactant (D) used in the second embodiment of the present invention can be appropriately selected according to the purpose. Examples thereof include polyalkylene glycols and fatty acid esters. be able to. In particular, fatty acid esters are preferred because they can form stable W / O microemulsions or solubilized W / O emulsions.

  Examples of the polyalkylene glycols used as the nonionic surfactant (D) include polyoxyethylene polyoxypropylene block copolymers and polyoxyethylene polyoxypropylene alkyl ethers. When polyalkylene glycols are used as the nonionic surfactant (D), the thermal stability can be improved.

The polyoxyethylene polyoxypropylene block copolymer is a compound represented by the following formula (1) or formula (2).
_{HO- (C 2 H 4 O)} a - (C 3 H 6 O) b - (C 2 H 4 O) c -H (1)
_{HO- (C 3 H 6 O)} a - (C 2 H 4 O) b - (C 3 H 6 O) c -H (2)
In the above formulas (1) and (2), a is preferably 2 to 160, b is 10 to 60, and c is preferably 2 to 160.
The polyoxyethylene polyoxypropylene block copolymer used as the nonionic surfactant (D) preferably has a polyoxypropylene moiety having a molecular weight of 3500 or less and a polyethylene oxide moiety of 50% by mass or less.

Polyoxyethylene polyoxypropylene alkyl ether is a compound represented by the following formula (3).
^{_{R 1 -O- (C 3 H 6}} O) m - (C 2 H 4 O) n -H (3)
In the above formula (3), R ¹ is an alkyl group having 6 to 16 carbon atoms, and n and m are preferably 2 to 16.

  In addition, as polyalkylene glycols used as the nonionic surfactant (D), it is possible to use substances other than polyoxyethylene alkyl ether and polyoxyethylene alkyl phenyl ether to reduce the environmental impact, This is preferable because management becomes easy.

  Examples of fatty acid esters used as the nonionic surfactant (D) include sorbitan fatty acid esters, ethylene glycol fatty acid esters, glycerin fatty acid esters, propylene glycol fatty acid esters, polyoxy fatty acid esters, and the like. Fatty acid esters are preferred because they can improve detergency. Among these, sorbitan fatty acid esters are preferable because they can form more stable W / O microemulsions or solubilized W / O emulsions.

  The blending ratio of each component in the cleaning composition according to the second embodiment of the present invention is 60.0 to 85.0% by mass of the aliphatic hydrocarbon (A) and the anionic surfactant (B). Is preferably 8.0 to 15.0 mass%, water (C) is 1.0 to 20.0 mass%, and nonionic surfactant (D) is preferably 2.0 to 5.0 mass%. .

  In the detergent composition according to the second embodiment of the present invention, if the amount of the anionic surfactant (B) is less than 8.0% by mass, the detergency with respect to highly polar dirt is lowered. In some cases, when the amount is more than 15.0% by mass, the cleaning property against dirt with low polarity may be deteriorated. It is preferable that the compounding quantity of an anionic surfactant (B) is 10.0-15.0 mass%.

  In the cleaning composition according to the second embodiment of the present invention, if the blending amount of water (C) is less than 1.0% by mass, the detergency of highly polar dirt may be reduced. When the amount is more than 20.0% by mass, there is a risk that the cleaning property against dirt with low polarity is lowered. The blending amount of water (C) is preferably 5.0 to 15.0 mass%, particularly preferably 5.0 to 10.0 mass%.

  In the cleaning composition according to the second embodiment of the present invention, when the blending amount of the nonionic surfactant (D) is less than 2.0% by mass, the cleaning performance with respect to highly polar dirt is lowered. When the amount is more than 5.0% by mass, there is a risk that the cleaning property against dirt with low polarity may be deteriorated. It is preferable that the compounding quantity of a nonionic surfactant (D) is 3.0-5.0 mass%.

  Moreover, in the cleaning composition which concerns on the 2nd Embodiment of this invention, an anionic surfactant (B) and a nonionic surfactant (D) are 10.0-20.0 mass% in total. In addition, the anionic surfactant (B) and the nonionic surfactant (D) are preferably blended at a ratio (mass ratio) of 2.0 to 5.0: 1.

  In the cleaning composition according to the second embodiment of the present invention, the total amount of the anionic surfactant (B) and the nonionic surfactant (D) is less than 10.0% by mass. In such a case, there is a risk that the cleaning efficiency with respect to highly polar dirt is lowered. On the other hand, when the total blending amount is larger than 20.0% by mass, there is a possibility that the cleaning efficiency with respect to dirt with low polarity is lowered. The total amount of the anionic surfactant (B) and the nonionic surfactant (D) is preferably 12.0 to 20.0% by mass.

  In the cleaning composition according to the second embodiment of the present invention, the blending ratio (mass ratio) of the anionic surfactant (B) and the nonionic surfactant (D) is the nonionic surfactant. When the agent (D) is 1, the anionic surfactant (B) is preferably 2.0 to 5.0 times. When the blending ratio of the anionic surfactant (B) is less than 2.0 times or more than 5.0 times that of the nonionic surfactant (D), there is a risk that the cleaning efficiency with respect to highly polar stains is lowered. There is.

  The cleaning composition according to the first and second embodiments of the present invention forms a W / O microemulsion or a solubilized W / O emulsion. By forming the W / O microemulsion or the solubilized W / O emulsion, the organic matter can be dissolved and washing unevenness can be prevented. In addition, since the cleaning composition of the present invention forms a stable W / O microemulsion or solubilized W / O emulsion even at a low temperature, it can exhibit high detergency without heating, Weak material can be cleaned.

  Conventionally, in order to form a stable W / O microemulsion or a solubilized W / O emulsion, in addition to water, a non-aqueous cleaning agent that becomes an oil layer, a surfactant, glycol ethers, alcohols Polar solvents such as glycols and polyoxyalkylene alkyl ethers have been used. Since the cleaning agent of the present invention does not contain a polar solvent, a specific resin or rubber material that may be eroded by the polar solvent, such as ABS resin, acrylic resin, vinyl chloride, nitrile rubber, urethane rubber, fluorine rubber, etc. It can be used for cleaning an object to be cleaned using the above materials. In addition, a resin cleaning jig can be used.

  In the present specification, the W / O microemulsion is a water (C) and anionic surfactant (B) that forms micelles having an average particle size of about 10 to 100 nm. It refers to the state of being dispersed in the hydrocarbon (A), which is in the form of a translucent or transparent liquid. In addition, the solubilized W / O emulsion means that water (C) and anionic surfactant (B) form micelles having an average particle diameter of about 1 to 10 nm. The state dispersed in A) is a transparent liquid. The W / O microemulsion or the solubilized W / O emulsion has a small particle size of the dispersed water (C), so that it does not separate into layers even when left for a long period of time. The average particle size of micelles can be measured by a zeta potential / particle size / molecular weight measuring device.

  The saturated moisture content of the cleaning compositions of the first and second embodiments of the present invention is preferably 10% by mass or more. When the saturated water content is 10% by mass or more, water (C) is dispersed in a high proportion in the aliphatic hydrocarbon (A), so that the polarity is high while maintaining the cleanability of low polarity dirt. It becomes possible to improve the detergency of dirt. The saturated moisture content of the cleaning composition of the present invention is preferably 10% by mass or more, more preferably 10 to 35% by mass.

  The saturated moisture content of the cleaning composition is determined in the composition comprising the aliphatic hydrocarbon (A) and the anionic surfactant (B), or the aliphatic hydrocarbon (A), the anionic surfactant (B) and Water when water (C) is blended in the composition comprising the nonionic surfactant (D) and the turbidity (JIS K0101) of the cleaning composition after the addition of water (C) is 100 NTU The ratio (mass%) in the cleaning composition of (C) is said. The turbidity of the cleaning composition used was a portable turbidimeter 2100P type (manufactured by Central Science Co., Ltd.), but is not limited thereto.

  The pH of the cleaning composition of the first and second embodiments of the present invention is less than 1.5. By setting the pH of the cleaning composition to less than 1.5, the zeta potential of the inorganic oxide particles in the smut is positively charged, and the dispersibility of the inorganic oxide particles is improved, thereby improving the smut detergency. To do. In order to improve the dispersibility of the inorganic oxide particles, it may be considered that the zeta potential of the inorganic oxide particles is negatively charged, that is, the pH of the cleaning composition is increased. For example, when it is about 12 to 13.5, an improvement in smut detergency is not confirmed. Moreover, there exists a secondary effect which can melt | dissolve an inorganic oxide particle by setting pH to less than 1.5. The pH of the cleaning composition is preferably less than 1.5, but more preferably 1.2 or less.

  In order to adjust the pH of the cleaning composition to less than 1.5, it is preferable to add an acid to the cleaning composition. As the acid blended in the cleaning composition, for example, any of inorganic acids such as phosphoric acid, hydrochloric acid, sulfuric acid and nitric acid and organic acids such as sulfamic acid and oxalic acid can be used.

  Moreover, since the main component of the cleaning composition of the present invention is an aliphatic hydrocarbon (A), the pH cannot be measured with a general pH meter, but the pH can be measured with a pH test paper. . For example, it is possible to measure whether the pH is less than 1.5 by using a pH measurement region 0.0 to 1.8 of a striped pH test paper (PEHANON).

  In addition, the cleaning compositions of the first and second embodiments of the present invention include an aliphatic hydrocarbon (A), an anionic surfactant (B), water (C), a nonionic surfactant. In addition to (D), other detergent components and various additives may be added as long as the effects of the present invention are not impaired.

  Here, as other cleaning agent components, hydrocarbons other than aliphatic hydrocarbon (A), for example, alkylbenzenes such as trimethylbenzene, ethyltoluene and tetramethylbenzene, alkylnaphthalenes such as methylnaphthalene, ethylnaphthalene and dimethylnaphthalene Is exemplified.

  Examples of the additive include a rust inhibitor, an antioxidant, an antiseptic, a chelating agent, an alkali agent, a bleaching agent, and an odorant. Examples of the rust preventive include fatty acid ester rust preventives such as pentaerythritol monoester and sorbitan monooleate, amine rust preventives such as amines and amine salts, aromatic carboxylic acids, alkenyl succinic acids, and naphthenates. Examples include carboxylic acid rust preventives, organic sulfonic acid rust preventives such as petroleum sulfonate, organic phosphate ester rust preventives, and oxidized paraffin rust preventives.

  The blending amount of the above-mentioned other components into the cleaning composition is not limited as long as the effects of the present invention are not impaired, but in the cleaning composition, 10.0% by mass or less is preferable, and 5.0 The content is more preferably at most mass%, further preferably at most 1.0 mass%. When the blending amount of other components exceeds 10.0% by mass, the cleaning effect on highly polar soil may be reduced, and a stable W / O microemulsion or solubilized W / O emulsion May interfere with formation.

  The cleaning composition of the first and second embodiments of the present invention can be produced by weighing each component described above in a predetermined amount, mixing and stirring. There is no limitation on the order of mixing and the stirring method, and a detergent composition that forms a stable W / O microemulsion or a solubilized W / O emulsion by mixing and stirring a predetermined proportion of each component. Can be manufactured.

  The cleaning method using the cleaning composition according to the first and second embodiments of the present invention includes immersing the object to be cleaned in the cleaning composition of the present invention, and applying the cleaning composition to the object to be cleaned. It can be carried out by spraying or wiping the surface of the object to be cleaned with a sponge impregnated with the cleaning composition. In the case of cleaning by immersion in the cleaning composition, the cleaning effect can be improved by performing ultrasonic waves, stirring, air bubbling, rocking of the object to be cleaned, and the like. In particular, it is preferable to use ultrasonic waves in order to improve the removability of the abrasive-derived inorganic oxide particles. Moreover, the cleaning effect can be improved by heating and cleaning the cleaning composition.

  After cleaning the object to be cleaned with the cleaning composition of the first and second embodiments of the present invention, the cleaning agent composition remaining on the surface of the object to be cleaned and the surfactant blended in the cleaning composition are removed. For this purpose, it is preferable to perform rinsing with the aliphatic hydrocarbon (A) used as the cleaning composition of the present invention, or a hydrocarbon having a boiling point lower than that of the aliphatic hydrocarbon (A), for example, normal decane. The rinse may be performed once or may be performed twice or more.

  As described above, the cleaning compositions of the first and second embodiments of the present invention are excellent in the removal of smuts in which inorganic oxide particles and organic substances adhering to parts after the polishing process or pressing process are combined. In addition, since the cleaning composition of the first and second embodiments of the present invention forms a stable W / O microemulsion or a solubilized W / O emulsion, other stains such as water-insoluble Excellent cleanability of processing oil and water-soluble processing oil. Among them, smut that adheres to parts in a pressing process using water-insoluble press oil can be cleaned with the cleaning composition of the present invention, and has excellent adhesion in PVD coating processes such as DLC coating after cleaning. A coating without pinholes can be obtained.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to the following Example.

(Formation of W / O microemulsion or solubilized W / O emulsion)
Prepare a detergent composition with the components and proportions shown in the Examples and Comparative Examples shown in Table 1 to Table 5, and whether the prepared detergent composition forms a W / O microemulsion or a solubilized W / O emulsion. It was determined by measuring the turbidity of the cleaning composition. The turbidity of the cleaning composition was measured using a portable turbidimeter 2100P (manufactured by Central Science Co., Ltd.). It was determined that a detergent composition having a turbidity of 100 NTU or less formed a W / O microemulsion or a solubilized W / O emulsion. The case where the turbidity was 100 NTU or less was marked with ◯, and the case where the turbidity was larger than 100 NTU was marked with ×.

(PH)
A cleaning composition was prepared with the components and proportions shown in the Examples and Comparative Examples shown in Tables 1 to 5, and the pH of the prepared cleaning composition was adjusted to a pH measurement region of 0.0 on a striped pH test paper (PEHANON). Measured mainly using ~ 1.8. The measurement scale of the striped pH test paper is 0.0-0.3-0.6-0.8-1.0-1.2-1.5-1.8, and the pH is 1.5-1.8. Measured with pH 1.5, pH 1.2-1.5 measured with 1.2, pH 1.0-1.2 measured with 1.0, The value measured in the range of pH 0.8-1.0 is shown as 0.8, and the value measured in the range of pH 0.6-0.8 is shown as 0.6. Those that could not be measured in the pH measurement region of 0.0 to 1.8 were measured with striped pH test paper in other pH measurement regions (1.8 to 3.8, 6.0 to 8.1, etc.).

(Abrasive cleaning test)
Cleaning compositions were prepared with the components and proportions shown in the Examples and Comparative Examples shown in Tables 1 to 6, and smut cleaning tests were performed using the prepared cleaning compositions. The object to be cleaned is a barrel-polished SUS430 work, and a black smut is attached to the surface. Cleaning is performed by immersing the object to be cleaned in the cleaning compositions of Examples and Comparative Examples shown in Tables 1 to 6, ultrasonic cleaning for 3 minutes (28 kHz, 25 ° C.), and ultrasonic cleaning for 3 minutes with normal decane. (28 khz, 25 ° C.) was performed twice, followed by hot air drying (70 ° C.) for 20 minutes. Evaluation of the cleaning property was made by visually observing that there was no residue (◯) and there was residue (×) on the workpiece.

(Water-insoluble processing oil cleaning test)
A cleaning composition was prepared with the components and proportions shown in the Examples and Comparative Examples shown in Table 6, and a smut cleaning test was performed using the prepared cleaning composition. The object to be cleaned is obtained by pressing a SUS430 work, and a black smut is attached to the surface. In the cleaning, the objects to be cleaned are immersed in the cleaning compositions of Examples and Comparative Examples shown in Table 6, ultrasonic cleaning for 3 minutes (28 kHz, 25 ° C.), and then ultrasonic cleaning for 3 minutes with normal decane (28 kHz, 28 kHz) 25 ° C.) was performed twice and dried with warm air (70 ° C.) for 20 minutes. Evaluation of the cleaning property was made by visually observing that there was no residue (◯) and there was residue (×) on the workpiece.

(Coating test)
The workpieces after the abrasive cleaning test with the cleaning compositions of Examples 37 and 38 shown in Table 6 were DLC coated, and the appearance was visually observed. The case where there was no pinhole or film peeling was marked with ◯, and the case where there was a pinhole or film peeling was marked with x.

  As shown in Tables 1 to 6, in the cleaning compositions of Examples 1 to 38 having a pH of less than 1.5 and stably forming a W / O microemulsion or a solubilized W / O emulsion, It was confirmed that smut adhering to the polishing process can be removed by washing. Further, according to Examples 37 and 38, it was possible to remove the smut generated by the processing of the water-insoluble press oil, and a DLC coating without film peeling or pinhole was obtained.

  The cleaning composition of the present invention includes parts used in various industrial fields such as automobiles, machines, precision equipment, electricity, electronics, optics, pipes and devices of various factories such as oil refineries and chemical plants, automobiles and industrial machines. It is useful for cleaning various articles such as metal parts and resin products used in daily life, and is suitably used for smut cleaning after polishing process and pressing process, especially PVD coating processing, It is suitable as a cleaning agent for pretreatment of DLC coating that requires surface cleanliness.

Claims (10)

An aliphatic hydrocarbon (A);
An anionic surfactant (B);
Water (C),
The aliphatic hydrocarbon (A) is 60.0-85.0% by mass, the anionic surfactant (B) is 10.0-15.0% by mass, and the water (C) is 1.0-15. 0.0% by mass,
A detergent composition having a pH of less than 1.5 and forming a W / O microemulsion or a solubilized W / O emulsion. An aliphatic hydrocarbon (A);
An anionic surfactant (B);
Water (C),
A nonionic surfactant (D),
The aliphatic hydrocarbon (A) is 60.0-85.0% by mass, the anionic surfactant (B) is 8.0-15.0% by mass, and the water (C) is 1.0-20. 0.0% by mass, containing the nonionic surfactant (D) at a ratio of 2.0 to 5.0% by mass,
A detergent composition having a pH of less than 1.5 and forming a W / O microemulsion or a solubilized W / O emulsion.   The anionic surfactant (B) and the nonionic surfactant (D) are included in a total amount of 10.0 to 20.0% by mass, and the anionic surfactant (B) and the nonionic surfactant are included. Surfactant (D) is mix | blended in the ratio (mass ratio) of 2.0-5.0: 1, The cleaning composition of Claim 2 characterized by the above-mentioned. The anionic surfactant (B) is a dialkylsulfosuccinate salt;
The detergent composition according to claim 2 or 3, wherein the nonionic surfactant (C) is a sorbitan fatty acid ester.   The detergent composition according to any one of claims 1 to 4, wherein the aliphatic hydrocarbon (A) is a paraffinic hydrocarbon or an olefinic hydrocarbon having 9 to 13 carbon atoms. .   The saturated water content measured by turbidity is 10 mass% or more, The cleaning composition as described in any one of Claims 1-5 characterized by the above-mentioned.   The detergent composition according to any one of claims 1 to 6, which does not contain a polar solvent.   The cleaning composition according to any one of claims 1 to 7, which is used for cleaning fine particles after polishing treatment.   The cleaning composition according to any one of claims 1 to 7, wherein the cleaning composition is used for cleaning fine particles after press working.   The cleaning composition according to any one of claims 1 to 7, which is used for pretreatment cleaning in a diamond-like carbon coating process.