KR100779296B1 - Oil-in-water microemulsion type detergent compositions containning aliphatic hydrocarbon oil - Google Patents

Abstract

The present invention relates to compositions of industrial detergents comprising nonionic and anionic surfactants, water, oils, and alcohol components, which are O / W microemulsion type cleaners and environmentally friendly water-based cleaners, many of which are composed of water. The surfactant constituting the cleaning agent is low toxicity, has excellent biodegradability, and the microemulsion prepared using the same has very low interfacial tension and thermodynamically stable properties. Therefore, the water-based cleaning agent of the present invention has excellent cleaning power against contaminants such as oils, fats, machine oils, cutting oils, grease oils, liquid crystal contamination, and fluxes on the surfaces of electronic parts and precision parts, and has no fire risk and excellent environmental safety. Do. In addition, the biggest feature is that it is not sensitive to temperature, so it has excellent cleaning power not only at low temperature but also at a wide temperature range, and has little effect on pH, hardness, and electrolyte concentration. The composition of such a washing | cleaning agent contains the following components (a)-(f).

(a) 0.5% by volume to 30% by volume of aliphatic hydrocarbon (R-CH ₂ CH ₃ : R is linear alkyl having 8-16 carbon atoms)

(b) 0.5% to 40% by volume of nonionic and anionic surfactants of HLB 4-20

(c) 0.5% to 30% by volume of alcohols as adjuvants

(d) (c) / (b) 0.01 to 1.5

(e) 50% to 80% by volume of water

(e) 0.01 ~ 10% by volume of other additives

Description

Oil-in-water microemulsion type detergent composition containing aliphatic hydrocarbon oil {OIL-IN-WATER MICROEMULSION TYPE DETERGENT COMPOSITIONS CONTAINNING HYDROCARBON OIL}

Figure 1 is a graph showing the solubility degree according to the type of oil in the cleaning agent according to the present invention of the same composition, it shows that solubilization is increased and saturated solubility increases with the length of the chain when saturated hydrocarbon is used.

Fig. 2 is a graph showing the solubility of D-limonene as a comparison with n-hexadecane, an aliphatic saturated hydrocarbon oil, indicating that aliphatic saturated hydrocarbon is more suitable for an aqueous detergent.

Figure 3 is a graph showing that the solubilization power is increased, unlike the nonionic surfactant alone system when using a mixed system of nonionic and anionic surfactant.

FIG. 4 is a graphical representation of the cleaning power difference between a mixing system of nonionic and anionic surfactants and a nonionic surfactant alone system.

FIELD OF THE INVENTION The present invention relates to industrial detergent compositions comprising aliphatic hydrocarbon oils, nonionic surfactants and anionic surfactants, alcohols, and water, and more particularly, have excellent biodegradability, low interfacial tension and thermodynamically stable contaminants. Excellent cleaning power, no risk of fire, low toxicity, excellent environmental safety, not sensitive to temperature, excellent cleaning power in low temperature range and wide temperature range. The present invention relates to an environment-friendly water-based oil-in-water (O / W) microemulsion type cleaner that contains a large amount of water, which is easy to apply the cleaner according to operating conditions, and has a large energy saving effect.

Ozone Depleting Substances (ODS), which has been widely used as a material having excellent cleaning power in various industrial fields such as automotive, electrical, electronics, precision equipment, heat treatment, plating, and optical industry, etc. There is active research to replace 1,1,1-TCE (1,1,1-trichloroethane) and CFC-113 (1,1,2-trichlorofluoroethane).

The above-mentioned 1,1,1-TCE and CFC-113 are ozone depleting substances, and the regulations are expected to be intensified. Therefore, there is an urgent need for alternative measures in related industries. It can be divided into three things as follows.

The first method is to use an alternative cleaner by modifying an existing cleaner. CFC-113 and 1,1,1-TCE, which have been used in the past, are low boiling point chlorine cleaners that are not regulated by steam degreasing. Although it may be used by reinforcing the heater or the cooling capacity of the existing cleaning device, there is a serious disadvantage that the air pollution problem can be caused because the chlorine-based cleaning agent is a low volatile organic solvent.                         

The second is a representative of the no-clean method, which uses no residual cleaning by replacing the flux used in the electronics industry with low residual flux, but this no-clean method is still early. It is difficult to use in advanced space, military and medical sectors that require a lot of cost as a step, and also requires the reliability and accuracy of electronic products.

The third is the case of using an alternative cleaning agent and the necessary alternative cleaning device, and most of the alternative cleaning agents are not regulated because the ozone depletion index is "0", and thus, many studies on the development of such alternative cleaning agents have been conducted. These alternative cleaners can be broadly divided into water-based, compliant, hydrocarbon-based, alcohol-based, and halogen-based solvents. Halogen-based oils occupy 50-55% of the total market. As there are safety issues such as toxicity and carcinogenicity, it is certain that the usage regulations will spread, and the market size is expected to gradually decrease. On the other hand, hydrocarbons have a market size of about 25 to 30%, but flammability and drying problems are pointed out, and the system solved by these flammability problems is a compliant or aqueous system. However, since the compliant cleaner uses a large amount of solvent, there is a high possibility of releasing VOC (Volatile Organic Compound) during drying, and there is a flammability problem, and there is also a problem of separately treating wastewater after washing. On the other hand, in the case of water-based cleaners, human body stability and work safety are superior to those of solvent-based cleaners, and various surfactants and builders have the advantage of increasing cleaning power and rinsing properties, and thus, various water-based cleaner systems are studied. Is actively underway.                         

Among aqueous detergent systems, alkaline detergents are used to remove strong organic and vegetable oils, mineral oils, waxes, greases, proteins, and carbons, due to the action of neutralizing acids, saponifying oils and fats (triglycerides), and having electrical conductivity. , Metal-plastic parts and glass-related industries. These alkaline cleaners have been used in combination with various builders such as surfactants and chelating agents depending on the contaminant, the degree of deterioration of the contamination and the adsorption state. However, conventional alkali cleaners have inferior low-temperature cleaning properties and have various problems, such as a decrease in the unit consumption of the cleaner as the cleaner adheres to the object to be cleaned.

In addition, in some aqueous cleaners, detergents using limonene (D-limonene, L-limonene, and a mixed form of these isomers), which are a type of terpine oil, are known. This tends to be high, especially in the gaps between joints and assembly parts of the surface of the cleaning agent. In addition, limonene has problems such as poor cleaning power with respect to polar contaminants.

The macro-objective of the present invention is a microemulsion form using a biodegradable surfactant and oil that can replace ozone depleting substances 1,1,1-TCE and CFC-113, which have been widely used due to their excellent detergency. To provide an environmentally friendly water-based alternative cleaner.

Specifically, the first object of the present invention is to provide a low interfacial tension of 10 ⁻¹ to 10 ⁻³ dyne / cm, in the form of a microemulsion comprising anionic surfactant and an aliphatic hydrocarbon oil with a highly biodegradable nonionic surfactant. It is intended to provide a cleaning agent having excellent cleaning power and rinsing property as well as non-polar pollutant as well as non-polar pollutant, and having excellent environmental friendliness and human safety.

The second object of the present invention can be applied not only to the existing washing temperature range but also to the low temperature range, which has an energy saving effect and is excellent without any influence on the change of conditions such as washing temperature, pH, hardness, and electrolyte concentration. An object of the present invention is to provide a thermodynamically stable cleaning agent capable of exerting cleaning power.

The third object of the present invention is to provide a detergent which is very safe for the workplace environment because there is no problem of singular odor and flammability.

The fourth object of the present invention is a concentrated type of detergent containing water, which is easy to transport and transport, relatively inexpensive, and, after rinsing, unlike the semi-conductive cleaner which uses the stock solution as it is. It is to provide an economical cleaner that can recycle water by simply treating wastewater by using coacervation phenomenon.

According to the cleaning composition for achieving the first to fourth objects of the present invention described above, (a) aliphatic hydrocarbon having 10 to 18 carbon atoms, most preferably aliphatic saturated hydrocarbon (R-CH ₂ CH ₃ : R is carbon number) 8-16 linear alkyl) 0.5-30 vol%, (b) HLB is 4-20, nonionic surfactant and 0.5-40 vol% anionic surfactant, (c) 0.5-30 vol% alcohol as an adjuvant and (d) 50 to 80% by volume of water, and (e) an oil-in-water microemulsion type aqueous detergent composition having a volume ratio of (c) / (b) = 0.01 to 1.5.

In the composition of the present invention described above, referring to the addition amount of the nonionic surfactant and the anionic surfactant, the anionic surfactant: nonionic surfactant = 1: 1000-1: 3, preferably anionic surfactant in a relative volume ratio : Nonionic surfactant = 1: 100-1: 4, More preferably, it is the ratio of anionic surfactant: nonionic surfactant = 1: 50-1: 4. It may also be desirable to use anionic surfactants having the same or approximately similar carbon chain lengths as the nonionic surfactants.

These anionic surfactants compensate for the sensitivity of the nonionic surfactants to the temperature of the detergents, so that they exhibit excellent cleaning power even at room temperature lower than the existing cleaning temperature of 40-50 ° C. It also serves to provide good detergency and safety on microemulsions.

In addition, the aliphatic saturated hydrocarbon oil is composed of a linear hydrocarbon in comparison with the conventional limonene, and forms a microemulsion while penetrating preferentially into the micelle to form a flexible packing of the micelle. In addition, the aliphatic saturated hydrocarbon oil has a merit of effectively solubilizing an insoluble compound having a large molecular weight and a large molecular size, and limonene has inherent flammability, specific odor and difficulty in biodegradation. It provides excellent physical properties with few of these problems.

Hereinafter, the present invention will be described in more detail.                     

The detergent according to the present invention is a microemulsion having a very low interfacial tension of 10 ⁻¹ to 10 ⁻³ dyne / cm using a straight chain hydrocarbon oil and a surfactant (a nonionic surfactant and an anionic surfactant, and if necessary, an auxiliary agent is added). As a type, it maintains an excellent detergency and a thermodynamically stable phase.

       Surfactant systems impart a specific order by interactions between hydrophilic-hydrophobic groups in a molecule to form supramolecular aggregates in a thermodynamically stable or quasi-stable state. Examples of such supramolecular aggregates include a monomolecular layer formed by adsorption at the gas-liquid interface and rearranged in the most thermodynamically stable direction, a molecular bilayer in solution, micelles, microemulsions, liquid crystals, or liposomes. Supramolecular microstructures such as the like.

Micelles are aggregates of spontaneous microstructures that are formed when a surfactant is dissolved in a solvent and are formed when the concentration of the surfactant in the liquid is above the critical micelle concentration (CMC). The geometry of micelles is determined by several variables, such as temperature and concentration. At lower concentrations near CMC, the structure of micelles is spherical, and as the concentration increases, tubular or layered structures, and lamellar and cube , Various kinds of liquid crystal structures such as hexagonal bodies and vesicles are formed. On the other hand, under conditions where the system exhibits hydrophobicity, the hydrophilic portion of the surfactant forms a reverse micelle with a structure opposite to the micelle, with the orientation of the core portion of the aggregate. On the other hand, when an insoluble substance such as oil is added to the micelles, the insoluble substance combines with the hydrophobic portion of the surfactant to form an O / W type microemulsion in which the oil is dispersed in water in a continuous phase as a dispersed phase, while reverse micelles. The addition of water to the water forms a W / O type microemulsion in which the water is continuously dispersed in the oil phase as a dispersed phase. In addition to these O / W type microemulsions and W / O type microemulsions, there are bicontinuous middle-phase microemulsions in which both water and oil phases are continuously present, and especially the middle-phase microemulsions are the same. The temperature that contains the volume of water and oil is called the phase inversion temperature (PIT) or hydrophilie-lipophilie balance (HLB) temperature. Under the PIT condition, the hydrophobicity-hydrophilicity of the system is balanced, and it is known that there is a very low interfacial tension generally in the range of 10 ⁻² to 10 ⁻⁴ dyne / cm. In general, microemulsions remain thermodynamically stable, unlike milky emulsions (macroemulsion) in which the particle size is isotropic in the range of 0.01 to 0.1 μm and visible to the naked eye, and the particle size is in the range of 1 to 50 μm. have. Microemulsions are widely applied and applied in the pharmaceutical, paint, cosmetics, and food industries. The factors affecting the solubilization of insoluble materials include the alkyl group length, the type and position of functional groups, and HLB (價). The chemical structure of surfactant, such as), the kind and structure of a solulizate, concentration, temperature, pH, an additive, presence or absence of counter ion, etc. are mentioned.

In the present invention, in order to obtain a composition capable of providing an aqueous detergent in consideration of the above matters, basically, phase equilibrium experiments were performed on non-ionic surfactants, water, and hydrocarbon oils to identify conditions under which a microemulsion was formed. Microemulsions are divided into three types: oil-in-water (O / W) type microemulsions, bicontinuous microemulsions, and W / O type microemulsions. Excellent cleaning ability for nonpolar and polar contaminants, but is generally only formed when a large amount of oil is present, making it unsuitable for the preparation of water-based cleaners containing more than 50% water.In the case of W / O type microemulsions, most compositions are oil. Since cleaning of plastic parts requires prior tests for solvent resistance and has a problem of having a separate waste water treatment device, it is inadequate in terms of environmental friendliness, and thus an O / W type emulsion system is most desirable. Do. O / W type microemulsion contains more than 50% of water, so there is no problem of flammability and safety, and it can be diluted, unlike the compliance system which uses almost the stock solution for cleaning, so it has a relatively low cost advantage in terms of cost. have. In addition, it is non-flammable and has almost no influence on resins. When used in combination with spray, shower, submerged in water, and ultrasonic waves, it is possible to exhibit more excellent cleaning power.

Nonionic surfactants are composed of a hydrophilic portion and a hydrophobic portion, and have a property of increasing hydrophobicity with increasing temperature. Therefore, the affinity with water is large at low temperature, and the affinity with oil is high at high temperature. O / W type microemulsions of nonionic surfactants have excellent cleaning power in the normal washing temperature and low temperature region, while the hydrophobicity of the system increases in the high temperature region, resulting in phase separation. Surprisingly, however, when using a mixture of anionic surfactants, the sensitivity decreases with increasing temperature, resulting in room temperature to 60 ° C. The microemulsion phase stability and excellent cleaning power are maintained up to the above high temperature region.

The present invention has been completed in consideration of the above-described conditions, the invention of the water-based detergent of the nonionic surfactant and the anionic surfactant.

Oil-in-water microemulsion type detergent compositions containing aliphatic hydrocarbon oils according to the present invention consist of:

(a) aliphatic hydrocarbon (R-CH ₂ CH ₃ , wherein R is straight chain alkyl of 8-16 carbon atoms) 0.5-30% by volume;

(b) 0.5 to 40% by volume of HLB having 4 to 20 nonionic surfactants and anionic surfactants;

(c) 0.5-30% by volume of alcohol as an adjuvant;

(d) 50-80% volume of water; And

(e) 0.01 to 10% by volume of other additives as optional components;

(f) where (c) / (b) = 0.01 to 1.5 in volume ratio.

The hydrocarbon oil of component (a) used in the present invention is an aliphatic hydrocarbon having 10 to 18 carbon atoms, preferably aliphatic saturated hydrocarbon (R-CH ₂ CH ₃ : R is a straight alkyl having 8 to 16 carbon atoms). It has no safety and has no risk of fire. The amount of the aliphatic hydrocarbon described above is blended in an amount of 0.5 to 30% by volume, preferably 1 to 20% by volume, more preferably 3 to 10% by volume, based on the total composition.

Examples of the aforementioned hydrocarbon oils which can be preferably used in the present invention include octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane and the like. .

The nonionic surfactant of component (b) has an average HLB value in the range of 4 to 20, and is not only used for microemulsion, but also improves cleanability, rinsing with water and good phase safety of the product. It is used to let.

In addition, in the present invention, the anionic surfactant may be usefully used to reduce the sensitivity to the temperature of the detergent and to maintain phase safety at high temperatures.

In the composition of the present invention described above, anionic surfactant: nonionic surfactant = 1: 1000-1: 3 in volume ratio, preferably anionic surfactant: nonionic surfactant = 1: 100-1: 4, more preferably Preferably, the ratio of anionic surfactant: nonionic surfactant = 1: 50 to 1: 4 is as described above, and it is preferable to use anionic surfactant having a carbon chain length that is about the same or about the same as that of the nonionic surfactant. It may also be preferred as described above.

       It is preferable that the nonionic surfactant which can be used suitably for the washing | cleaning agent of this invention is the range whose average HLB value is 4-20. Such nonionic surfactants are used not only for microemulsion of hydrocarbon oils, but also for improving cleanability, rinsing with water and phase stability of products.

Examples of the above nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl phenol ethers, polyoxyalkylene aryl phenol ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, and polyoxy Alkylene alkyl amines, sorbitan fatty acid esters, alkyl alcohol amines, aryl alcohol amines, or any mixtures thereof; polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl phenol ethers in view of biodegradability and performance , Alkyl alcohol amines are preferred, and more preferably polyoxyalkylene alkyl ethers. These nonionic surfactants are in the range of 0.5 to 40% by volume, preferably in the range of 5 to 35% by volume, more preferably in the range of 15 to 30% by volume on the basis of preforming properties.

Examples of anionic surfactants that can be used in the present invention include alkyl ether sulfates, straight chain alkylbenzene sulfonates, alpha-olefin sulfonates, alkanesulfonates, alkyl sulfonates, preferably alkyl sulfonates, and more preferably. Preferably, sodium decyl sulfate, sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium hexadecyl sulfate, sodium octadecyl sulfate, sodium lauryl sulfate, sodium myristyl sulfate, and sodium stearyl sulfate. Sodium dodecyl sulfate.

Next, the alcohols as another component (c) that can be used in the cleaning agent of the present invention will be described. Alcohols are added to increase the phase safety and solubility of the microemulsions produced in systems consisting of aliphatic hydrocarbons, surfactants, and water, and also help to maintain microemulsions over a wide temperature range, allowing them to be cleaned at various cleaning temperatures. give.

Examples of the alcohols that can be used in the present invention include ethanol, propanol, butanol, hexanol, heptanol, octanol, decanol, isopropanol, isohexanol, isooctanol, isodecanol, ethylene glycol, diethylene glycol, Triethylene glycol, ethylene glycol methyl ether, diethylene glycol methyl ether, triethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol ethyl ether, triethylene glycol ethyl ether, ethylene glycol monopropyl ether, diethylene glycol monopropyl ether , Triethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene monobutyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, triethylene glycol dibutyl ether, ethylene glycol mono Hexyl ether, Diethylene glycol monohexyl ether, triethylene glycol monohexyl ether, or any mixture thereof may be used, but preferably propanol, butanol, diethylene glycol, triethylene glycol, ethylene glycol monobutyl ether, diethylene glycol mono Butyl ether, triethylene monobutyl ether, ethylene glycol monohexyl ether, diethylene glycol monohexyl ether, triethylene glycol monohexyl ether, or any mixture thereof can be used, more preferably propanol, diethylene glycol Monobutyl ether, triethylene monobutyl ether, or any mixture thereof. These alcohols are 0.5-30 volume%, Preferably it is 5-30 volume%, More preferably, it is 10-25 volume% based on a precursor composition. Here, the mixing ratio by the volume ratio of the alcohol / nonionic and anionic surfactant is mixed in a ratio of 0.01 to 1.5, preferably 0.05 to 1.2, more preferably 0.1 to 1.0.

     Water, which is another component (d) in the cleaning agent of the present invention, is a composition that occupies the continuous phase of the microemulsion, and not only affects stability and washability, but also plays an important role in the cleaning of polar contamination. The composition ratio is 50 to 80% by volume, preferably 55 to 75% by volume, more preferably 65 to 75% by volume based on the composition.

Finally, the other additives of component (f) as optional additive ingredients are within the range where the phase stability of the microemulsion is not a problem, and the cleaning and rinsing properties and the human and environmental safety are not caused to the extent that they do not cause any problems. As an example of the other additives described above, an anticorrosive agent for imparting a rust prevention effect to the microemulsion detergent, an antioxidant, a chelating agent for metal cleaning, and an antifoaming agent for removing bubbles may be combined in an appropriate amount. The compounding amount is 0.01 to 10% by volume, preferably 0.1 to 5% by volume, more preferably 0.1 to 1% by volume based on the total composition volume. May vary.

The microemulsion detergent composition of the present invention can be prepared by mixing the components of (a) to (d) or (a) to (e) in a conventional manner, but the other additives of (e) are polar In the case of, it is advantageous to first mix the water of (d) with the surfactant of (b) and the alcohol of (c), and then mix the aliphatic hydrocarbon oil of (a) which is the remaining component. It is advantageous to mix the aliphatic hydrocarbon oil of a) and then to the mixture of the remaining components (b), the alcohol of (c) and the water of (d). The microemulsion type cleaning agent according to the present invention manufactured in this way is effective for cleaning contaminants such as oil, fat, machine oil, cutting oil, grease oil, liquid crystal contamination, rosin type flux, etc. which are on the surface of electronic parts and precision parts. It can be used as a cleaning method, and can be cleaned by various cleaning methods such as ultrasonic cleaning, deposition cleaning, vibration cleaning, and spray cleaning. In addition, after completion of washing, it is possible to continuously rinse in low temperature and hot water, and shows excellent washing and rinsing properties.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but it should be understood that the present invention is only for illustrating the present invention and not for limiting the present invention.

Examples 1-32 and Comparative Examples 1-4

Solubility Degree Measurement

The solubility of the detergent was measured until there was no phase change by adding a certain amount of abietic acid, a model flux.

Preparation of Specimen :

4 g of abietic acid was dissolved in 10 ml of IPA (Isopropyl alcohol), and then thinly coated on a stainless steel specimen (SUS plate) having a size of 7.5 × 2.4 × 0.2 cm ³ . After leaving at room temperature for 2 hours-4 hours, it was left to stand in 70 degreeC-90 degreeC oven for about 12 hours.

Detergency and Rinseability Evaluation :

The cleaning temperature was tested at 30 ° C for low-temperature cleaning power and relatively high temperature of 40 ° C and 50 ° C, which are the existing cleaning temperatures, and prepared with compositions as shown in the following Examples and Comparative Examples. 50 ml of the microemulsion-type cleaning solution was immersed and rinsed by immersing the contaminated specimen prepared by the above method for 2 minutes and then immersing the contaminated specimen again for 2 minutes in a rinse liquid at room temperature (electric conductivity: about 18 kV / cm). . Then, after warm air drying for about 2 minutes, the cleaning power was evaluated by measuring the volume of the contaminant removed from the specimen.

Detergency Evaluation Method and Criteria :

% Removal = (A-B) / A x 100 (where A is the volume of contaminant attached before the test and B is the volume of contaminant attached after the cleaning test)

Cleaning power  (Double-circle): There is no contamination of a contamination source in a test specimen, and it is very favorable  (Circle): The test specimen has little residue of a contamination source, and is favorable  (Triangle | delta): There exists some residue of a contamination source in a test specimen, and is bad  Ｘ: Poor source of test specimen remains Rinse castle  ◎ very good  ○: good  △: somewhat bad  Ｘ: bad

Note) ЧE: Microemulsion

Note) ЧE: Microemulsion

Note) ЧE: Microemulsion

Tables 2 to 5 above describe polyoxyethylene (6) lauryl ether systems and polyoxyethylene (7) under conditions having the same composition (i.e. the same volume ratio of alcohol to surfactant and the same hydrocarbon oil used). Phase stability and detergency by the addition of anionic surfactants to the lauryl ether system are shown. In particular, when compared with Comparative Examples 1 to 4, it can be seen that all the mixing system of the nonionic and anionic surfactant according to the present invention exhibits excellent phase stability and cleaning power even at high temperatures. This indicates that the sensitivity to temperature in the nonionic surfactant alone system is well complemented, and that cleaning in a wide range of temperatures is possible.

The present invention provides a microemulsion type detergent in which a nonionic surfactant and an anionic surfactant having excellent biodegradability are mixed at a specific ratio, thereby providing a non-polarity due to a very low interfacial tension of 10 ⁻¹ to 10 ⁻³ dyne / cm. As well as pollutants, it has excellent cleaning and rinsing properties for polar pollutants, and can be applied to a wide range of temperatures in low and high temperature zones, and is less affected by pH, electrolyte concentration and water hardness according to operating conditions. The specific odor and flammability of the refined hydrocarbon oil is relatively low, which is excellent in environmental friendliness, human safety and fire safety. The microemulsion type cleaning agent according to the present invention is effective for cleaning contaminants such as oils, fats, machine oils, cutting oils, grease oils, liquid crystal contamination, rosin-type fluxes, etc. which are on the surfaces of electronic parts and precision parts, and are ultrasonic cleaning and deposition. It is possible to apply various cleaning methods such as cleaning, vibration cleaning, and spray cleaning, and since there is no flash point, it is not necessary to install explosion-proof equipment, so that additional equipment cost can be saved, and after completion of cleaning, rinsing can be performed continuously. Therefore, there is an advantage of easy handling, and since both the basic phase behavior of the composition and the phase transition with respect to temperature are known, it is easy to separate the oil and oil from the desired composition and conditions by using coacervation, which makes wastewater treatment work easier. Simple and economical usefulness because it can recycle used water The.

Claims (8)

(a) 0.5-30 vol% of aliphatic hydrocarbon oils having 10 to 18 carbon atoms; (b) HLB is 4 to 20 nonionic surfactant and 0.5 to 40% by volume of anionic surfactant, (c) 0.5-30% by volume of alcohol as an adjuvant; And (d) 50 to 80% by volume of water, (e) the volume ratio (c) / (b) = 0.01 to 1.5, (f) The anionic surfactant: nonionic surfactant = 1: 1000-1: 3, by volume ratio Oil-in-water microemulsion type detergent composition containing aliphatic hydrocarbon oil. The oil-in-water microemulsion type detergent composition according to claim 1, wherein the aliphatic hydrocarbon oil of component (a) is aliphatic saturated hydrocarbon (R-CH ₂ CH ₃ , wherein R is straight alkyl having 8 to 16 carbon atoms). The oil-in-water microemulsion type detergent composition according to claim 1 or 2, wherein the anionic surfactant: nonionic surfactant of component (b) is 1: 100 to 1: 4 in volume ratio. The hydrocarbon oil according to claim 1 or 2, wherein the hydrocarbon oil of component (a) is n-octane, n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetra An oil-in-water microemulsion type detergent composition, which is at least one compound selected from the group consisting of decane, n-pentadecane, n-hexadecane, n-heptadecane, and n-octadecane. The nonionic surfactant according to claim 1 or 2, wherein the nonionic surfactant of component (b) is polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenol ether, polyoxyalkylene aryl phenol ether, polyoxyalkylene fatty acid. At least one compound selected from the group consisting of esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl amines, sorbitan fatty acid esters, alkyl alcohol amines, and aryl alcohol amines; Oil-in-water micro, wherein the anionic surfactant of component (b) is at least one compound selected from the group consisting of alkyl ether sulfates, linear alkylbenzene sulfonates, alpha-olefin sulfonates, alkanesulfonates, and alkyl sulfonates. Emulsion type detergent composition. The method according to claim 5, wherein the anionic surfactants are sodium decyl sulfate, sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium hexadecyl sulfate, sodium octadecyl sulfate, sodium lauryl sulfate, sodium myristyl sulfate, and sodium stearyl sulfate. An oil-in-water microemulsion type detergent composition which is at least one compound selected from the group consisting of sulfates. The alcohol according to claim 1 or 2, wherein the alcohol of component (c) is ethanol, propanol, butanol, hexanol, heptanol, octanol, decanol, isopropanol, isohexanol, isooctanol, isodecanol, Ethylene glycol, diethylene glycol, triethylene glycol, ethylene glycol methyl ether, diethylene glycol methyl ether, triethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol ethyl ether, triethylene glycol ethyl ether, ethylene glycol monopropyl ether , Diethylene glycol monopropyl ether, triethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene monobutyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, triethylene glycol Dibutyl ether, ethylene glycol monohexyl ether, Oil-in-water microemulsion type detergent composition which is at least 1 sort (s) of compound chosen from the group which consists of diethylene glycol monohexyl ether and triethylene glycol monohexyl ether ethanol.        The cleaning agent according to claim 1, wherein the cleaning agent further comprises at least one additive selected from the group consisting of a rust inhibitor, an antioxidant, a chelating agent, and an antifoaming agent in a range of 0.01 to 10% by volume based on the volume of the cleaning agent composition described above. Oil-in-water microemulsion type detergent composition.

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