JP4603289B2 - Cleaning composition for hard surface - Google Patents

Description

  The present invention relates to a hard surface cleaning composition, and more specifically, a stain component present on the surface (hereinafter also referred to as a hard surface) of a hard member such as precision parts, jigs and tools, metal, glass, ceramics, and plastics. It is related with the cleaning composition which is excellent in the removal property and rinsing property of this, and is also safe. The present invention also relates to a method for cleaning a hard surface using the cleaning composition.

  Conventionally, removal of dirt components mainly composed of organic substances such as oils and fats, machine oils, cutting oils, greases, liquid crystals, rosin wax, etc. present on the surface of hard parts such as precision tools or assembly tools. Uses chlorine-based solvents such as trichloroethane and tetrachloroethylene, fluorocarbon solvents such as trichlorofluoroethane, alkaline detergents containing surfactants and builders in sodium orthosilicate and caustic soda, and low-boiling hydrocarbon solvents. Has been. However, chlorine-based and chlorofluorocarbon-based solvents have problems in terms of safety, toxicity, work environment and environmental pollution, and alkaline cleaners remain on the surface of objects to be cleaned when used for precision parts. Then, there was a concern that it would adversely affect plastic parts and the like, and there was a concern that electrical characteristics were extremely adversely affected in electrical and electronic parts.

  In order to solve this problem, for example, a detergent composition comprising alkyl glyceryl ether and octadecene and / or water (Patent Document 1), a detergent composition containing a specific alkyl polyglycoside (Patent Document 2), an alkyl glycoside And a detergent composition comprising an alkyl polyglyceryl ether (Patent Document 3) and the like. However, none of these cleaning compositions has a sufficiently satisfactory effect in terms of rinsing properties and repeated cleaning properties required for industrial cleaning agents.

  In addition, as a cleaning method using these cleaning composition, first cleaning is performed with a cleaning agent stock solution or a cleaning solution diluted with water as a cleaning process, and then rinsed with water as a rinsing process, followed by a drying process. This is a common cleaning method.

  Furthermore, recently, the precision of processing of precision parts has been improved, so that there are a lot of irregularities, the gaps of the recesses are very narrow, and the time required for the cleaning process tends to be further shortened due to the improvement in productivity.

  In particular, with respect to the removal of liquid crystal stains, with the thinning of the liquid crystal display panel, the gap interval of the liquid crystal cell becomes narrower and it becomes more difficult to clean the liquid crystal existing between the gaps. When the conventional cleaning composition as described above is used against such liquid crystal stains, the cleaning properties of the liquid crystals existing between the gaps are insufficient even if the cleaning properties of the liquid crystals existing on the surface are good. Met.

  From these facts, the solubility of various oil stains (especially dirt that adheres to narrow gaps and recesses of precision parts) present on the surface of hard parts such as precision parts or assembly tools, jigs and tools, A cleaning agent that has excellent removability and does not require time for rinsing has been desired.

  On the other hand, alkaline cleaners have been widely used for cleaning surfaces of hard members such as metal, glass, ceramics, and plastics. In the field where an alkaline cleaning agent is used, in order to improve the cleaning performance, cleaning is often performed at a cleaning temperature higher than room temperature. For example, when steel plates (steel strips) are continuously washed at steelworks, etc., the washing equipment is usually structured to continuously wash the steel plates (steel strips) wound up in a coil shape, 30 to 1100 m It is operated at a speed of about / min, and the cleaning time of the steel plate is extremely short, at most several seconds. Accordingly, the cleaning agent for steel sheet generally has a temperature of 60 to 80 ° C. in order to remove oil adhering to the surface of the steel sheet in a short time. However, from the economical viewpoint, there has been a demand for a cleaning agent that can maintain the cleaning performance at high temperatures even when the cleaning temperature is lowered.

Examples of the hard surface cleaning composition as described above include an alkaline cleaning composition containing a polyglyceryl ether type nonionic surfactant and an alkaline agent (Patent Document 4), glyceryl ether, terpene hydrocarbon, and surfactant. An alkaline cleaning composition containing an agent and an alkaline agent (Patent Document 5) is disclosed. However, these cleaning compositions are not sufficient in terms of repeated cleaning properties, low foaming properties, etc. under low temperature (50 ° C. or lower) and short-time cleaning conditions.
JP-A-6-346092 JP-A-8-319497 Japanese Patent Laid-Open No. 3-17496 Japanese Patent Laid-Open No. 5-194999 JP-A-11-256200

  Therefore, the present invention can be used universally for various types of dirt on a hard surface, exhibits excellent solubility and removability, and can particularly improve the rinsing properties that have been rate-determined up to now, and is environmentally friendly. It is an object of the present invention to provide a hard surface cleaning composition with high safety and no risk of contamination, and a hard surface cleaning method using the cleaning composition.

That is, the gist of the present invention is as follows.
[1] Hard surface cleaning composition containing alkyl glycoside, glyceryl ether, olefinic hydrocarbon and / or paraffinic hydrocarbon, and water,
[2] A method of cleaning a hard surface using the cleaning composition according to [1],
About.

  By using the hard surface cleaning composition of the present invention, it can be used universally for various types of stains on the hard surface, exhibits excellent solubility and removability to these stains, and Cleans the surface of hard parts such as precision parts, metal tools, metal, glass, ceramics, plastics, etc., which can greatly improve the rinsing performance, which has been rate-limiting until now, and has no risk of environmental pollution. The effect that it can be performed is produced.

  The hard surface cleaning composition of the present invention (hereinafter simply referred to as a cleaning composition) contains an alkyl glycoside, glyceryl ether, an olefinic hydrocarbon and / or a paraffinic hydrocarbon, and water. There is a big feature in using ingredients together.

In particular, the present invention is characterized in that olefinic hydrocarbons and / or paraffinic hydrocarbons that are not inherently soluble in water can be dispersed even in a high water content region by combining alkylglycosides and glyceryl ethers.
Therefore, it is possible to dissolve and remove oily dirt existing on hard surfaces even at high moisture content, not only greatly reducing the cost of cleaning agents, but also considering flammability compared to conventional cleaning agents. It becomes easier to handle without the need for strict moisture management.

  In addition, conventional water-based cleaning agents containing hydrocarbons become cloudy when the cleaning components adhering to the object to be cleaned are brought into the rinsing tank, so the load during rinsing when washing the cleaning components from the object to be cleaned is large. However, since the cleaning composition of the present invention stably disperses hydrocarbons even in a high water content region, it is uniform and transparent even when diluted, and can greatly reduce the load of the rinsing process after cleaning. Become.

  Furthermore, the liquid crystal existing between the gaps of the liquid crystal cell can be washed, and the effect that the liquid crystal stains present in the narrow liquid crystal cell between the gaps, which were difficult to wash, can be washed. . In addition, the conventional cleaning agent has a large load during rinsing because the cleaning components remaining in the cell gap are washed away, but the rinsing is greatly facilitated by using the cleaning composition of the present invention.

Furthermore, as described later, the present invention can lower the surface tension than alkylglycoside alone and increase the permeation / dissolving power against oil stains by combining with an alkali agent in a specific ratio of alkylglycoside and glyceryl ether, as will be described later. In addition, the emulsifying power and ease of rinsing with alkyl glycosides can be maintained.
As a result, the cleaning composition of the present invention can efficiently remove oil at a low temperature in an extremely short time, and is an industrial cleaning agent that requires repeated cleaning and low foaming properties, particularly very short. It is useful in the field of detergents for steel sheets such as steel sheets that require degreasing properties over time.

  The cleaning composition of the present invention has sufficient hard surface cleaning performance even at a low temperature, but also exhibits performance superior to the above-described known cleaning agents even at temperatures higher than 50 ° C.

  In the present invention, the hard surface means the surface of a hard member such as a precision part of an object to be cleaned, jigs, metals, glass, ceramics, plastic, etc., and the cleaning composition of the present invention is the hard surface. Various stains such as liquid crystal, oil components, and flux (residue generated during soldering) adhering to the surface are to be cleaned.

The alkyl glycoside used in the present invention has the following general formula (1):
R ¹ (OR ² ) _x G _y (1)
[Wherein, R ¹ represents a linear or branched alkyl group having 8 to 18 carbon atoms, an alkenyl group, or an alkylphenyl group, R ² represents an alkylene group having 2 to 4 carbon atoms, and G represents a carbon number. And a residue derived from a reducing sugar having 5-6, where x (mean value) represents 0 to 5 and y (mean value) represents 1 to 5.

In the formula, x is preferably 0 to 2, more preferably 0. y is preferably 1 to 1.5, more preferably 1 to 1.4. The carbon number of R ¹ is preferably 9 to 16, more preferably 10 to 14 from the viewpoint of detergency. X and y are determined by proton ( ¹ H) NMR.

  The alkyl glycoside is not particularly limited as long as it satisfies the general formula (1). For example, decyl glycoside, dodecyl glycoside, myristyl glycoside and the like are preferable from the viewpoint of obtaining high detergency.

The content of the alkyl glycoside is preferably 0.01 to 80% by weight in the detergent composition.
Among them, when cleaning the hard surfaces of precision parts and jigs and tools, from the viewpoint of obtaining high rinsability, the content of alkylglycoside is preferably 1 to 80% by weight, more preferably 1 to 50% by weight, 2 -40% by weight is more preferred, and 5-30% by weight is particularly preferred.
When cleaning hard surfaces such as metal, glass, ceramics, and plastics, it is preferable to use an alkylglycoside and an alkali agent in combination. In this case, from the viewpoint of obtaining high rinsability, the alkylglycoside content is preferably 0.01 to 20% by weight, more preferably 0.02 to 10% by weight, still more preferably 0.03 to 5% by weight, and 0.04 to 3% by weight. Is particularly preferred.

The glyceryl ether used in the present invention is a linear or branched alkyl group or alkenyl group having 4 to 12 carbon atoms from the viewpoint of maintaining a uniform and transparent product property within the operating temperature range without degrading the detergency. For example, n-butyl group, isobutyl group, n-hexyl group, isohexyl group, n-heptyl group, n-octyl group, 2-ethylhexyl group, n-nonyl group, n-decyl group, etc. Those having an alkyl group of ˜12 are preferable, and those having 1 or 2 alkyl groups having 5 to 10 carbon atoms and more preferably 5 to 8 carbon atoms are particularly preferable. Furthermore, the glyceryl ether used in the present invention may be a monoalkyl diglyceryl ether or a monoalkyl polyglyceryl ether in which two or more, preferably 2-3 glyceryl groups are connected by an ether bond. In particular, monoalkyl glyceryl ether and monoalkyl diglyceryl ether are preferable from the viewpoint of excellent liquid crystal stain cleaning properties. These glyceryl ethers may be used alone or in admixture of two or more. In the present invention, by using such glyceryl ether, the dispersibility of the organic solvent and water can be stabilized, so that there is an advantage that more oily stains and / or liquid crystal stains can be washed. .
A particularly preferred glyceryl ether is 2-ethylhexyl glyceryl ether.

The content of glyceryl ether is preferably 0.02 to 80% by weight in the detergent composition.
Among them, when cleaning the hard surfaces of precision parts and jigs and tools, the content of glyceryl ether is preferably 0.2 to 0.5 from the viewpoint of stabilizing the dispersion of hydrocarbons and water and achieving both high cleaning performance and rinsing performance. 80% by weight is preferable, more preferably 0.5 to 50% by weight, still more preferably 1 to 30% by weight, and particularly preferably 1 to 20% by weight.
When cleaning hard surfaces such as metal, glass, ceramics, and plastics, it is preferable to use an alkali agent in combination. In this case, from the viewpoint of enhancing the permeability to oil stains, the content of glyceryl ether is preferably 0.02 to 40% by weight, more preferably 0.03 to 20% by weight, further preferably 0.05 to 10% by weight, and 0.1 to 5%. % By weight is particularly preferred.

In the detergent composition of the present invention, the weight ratio of alkylglycoside / glyceryl ether is preferably 0.25 to 10.
In particular, when cleaning the hard surfaces of precision parts and jigs and tools, the weight ratio of alkylglycoside / glyceryl ether is preferably 10 or less from the viewpoint of suppressing foaming during cleaning, and the hydrocarbon and water are stable. From the viewpoint of dispersion, one or more is preferable. Therefore, the weight ratio of alkylglycoside / glyceryl ether is preferably 1 to 10, more preferably 3 to 8, and further preferably 3 to 6.
When cleaning hard surfaces such as metal, glass, ceramics, and plastics, it is preferable to use an alkali agent in combination. In this case, the weight ratio of alkylglycoside / glyceryl ether is preferably 4 or less from the viewpoint of achieving both permeability and rinsing properties, and preferably 0.25 or more from the viewpoint of maintaining rinsing properties. Accordingly, the weight ratio of the alkyl glycoside / glyceryl ether is preferably 0.25 to 4, more preferably 0.3 to 3, and still more preferably 0.4 to 1.

The hydrocarbon used in the present invention is an olefinic hydrocarbon and / or a paraffinic hydrocarbon.
As the olefinic hydrocarbon and paraffinic hydrocarbon, a compound having 10 to 18 carbon atoms, preferably 10 to 14 carbon atoms is preferable. Straight chain or branched chain saturated or unsaturated hydrocarbon solvents; and cycloaliphatic hydrocarbon solvents such as cyclodecane and cyclododecene. Of these, C10-18, preferably 10-14 linear or branched, saturated or unsaturated hydrocarbons are preferred, and olefinic hydrocarbons are more preferred.
These hydrocarbons may be used alone or in admixture of two or more.

  In the present invention, in addition to the olefinic hydrocarbon and paraffinic hydrocarbon, an aromatic hydrocarbon solvent such as an alkylbenzene such as nonylbenzene and dodecylbenzene, a naphthalene compound such as methylnaphthalene and dimethylnaphthalene is also used. be able to.

In the cleaning composition of the present invention, the content of these hydrocarbons is preferably 0.005 to 80% by weight.
Among them, when cleaning hard surfaces of precision parts and jigs and tools, the content of the hydrocarbon is preferably 0.1 to 80% by weight, more preferably 0.5 to 50% by weight, from the viewpoint of obtaining high cleanability. From the viewpoint of achieving both detergency and rinsing properties, the content is more preferably 1 to 20% by weight, further preferably 4 to 20% by weight, and further preferably 5 to 20% by weight.
When cleaning hard surfaces such as metal, glass, ceramics, and plastics, it is preferable to use an alkali agent in combination. In this case, the content of the olefinic hydrocarbon and the paraffinic hydrocarbon is preferably 0.005 to 10% by weight, more preferably 0.01 to 8% by weight from the viewpoint of increasing the permeability to oil stains and suppressing foaming. Preferably, 0.02 to 5% by weight is more preferable.

There is no limitation in particular as water used for this invention, Ion exchange water, a pure water, deionized water, etc. are mentioned.
The water content is preferably 5 to 99.8% by weight in the cleaning composition.
Among them, when cleaning the hard surfaces of precision parts and jigs and tools, the water content is preferably 5 to 98% by weight from the viewpoint of preventing the cleaning composition from igniting and rinsing properties. 10 to 95% by weight is more preferred, 30 to 90% by weight is still more preferred, 50 to 90% by weight is particularly preferred, and 60 to 90% by weight is most preferred.
When cleaning hard surfaces such as metal, glass, ceramics, and plastics, it is preferable to use an alkali agent in combination. In this case, the content of water is preferably 5 to 99.8% by weight and more preferably 10 to 99.5% by weight from the viewpoint of reducing the drainage load during use and concentrating the cleaning liquid.

  In the present invention, as a preferred combination of alkyl glycoside, glyceryl ether, olefinic hydrocarbon and / or paraffinic hydrocarbon, alkyl glycoside is decyl glycoside and dodecyl glycoside, glyceryl ether is 2-ethylhexyl glyceryl ether and Examples thereof include hexyl glyceryl ether, wherein the olefinic hydrocarbon and / or paraffinic hydrocarbon is selected from decene, dodecene, tetradecene, decane, dodecane and tetradecane.

Moreover, it is preferable that the cleaning composition of this invention contains an alkaline agent from a viewpoint of obtaining still higher cleaning property.
As the alkaline agent used in the present invention, any water-soluble alkaline agent can be used. Specific examples include hydroxides of alkali metals such as sodium hydroxide and potassium hydroxide, sodium orthosilicate, sodium metasilicate, and sodium sesquisilicate (for example, No. 1 sodium silicate, No. 2 sodium silicate, No. 3 sodium silicate). Silicates such as sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, disodium carbonate, sodium bicarbonate, dipotassium carbonate And carbonates such as potassium hydrogen carbonate, and borate salts such as sodium borate. Two or more water-soluble alkaline agents may be used in combination. Of these alkali agents, sodium hydroxide, potassium hydroxide, sodium orthosilicate, and sodium metasilicate are preferred.

  The content of the alkaline agent in the cleaning composition is preferably from 0.1 to 50% by weight, more preferably from 0.1 to 10% by weight, from the viewpoint of maintaining high detergency and concentrating the cleaning liquid. 0.2-8 weight% is still more preferable, and 0.5-5 weight% is still more preferable.

  When using an alkali agent, it is preferable to use a chelating agent and / or a water-soluble polymer carboxylic acid in combination, particularly when continuously cleaning the rolling oil adhering to the surface of the steel plate (steel strip).

  The cleaning composition of the present invention can further improve the cleaning performance by using a chelating agent in combination. Examples of the chelating agent used include aldonic acids such as gluconic acid and glucoheptonic acid, and aminocarboxylic acids such as ethylenediaminetetraacetic acid. Examples include acids, hydroxycarboxylic acids such as citric acid and malic acid, phosphonic acids such as aminotrimethylene phosphonic acid and hydroxyethylidene diphosphonic acid, and alkali metal salts, lower amine salts, ammonium salts and alkanol ammonium salts thereof. Particularly preferred are sodium gluconate, sodium glucoheptonate, sodium ethylenediaminetetraacetate, sodium citrate, and sodium hydroxyethylidene diphosphonate.

  The content of the chelating agent in the cleaning composition of the present invention is preferably from 0.01 to 15% by weight, more preferably from 0.05 to 10% by weight from the viewpoint of cleaning properties and economy.

  The cleaning composition of the present invention can further improve storage stability and cleaning performance by incorporating a water-soluble polymer carboxylic acid. Examples of the water-soluble polymer carboxylic acid used in the present invention include compounds represented by the general formula (2).

[Wherein, R ^{1 to} R ⁶ are the same or different and each represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, COOM, or OH, where M is a hydrogen atom, an alkali A metal, an alkylamine having 1 to 4 carbon atoms, or an alkanolamine having 1 to 6 carbon atoms, m and n each represents the number of moles of the structural unit in parentheses, and m / n (molar ratio) is 0/10. ~ 10/1. ]

The both ends of the groups of the general formula (2) is not particularly limited, hydrogen, OH, alkyl group having 1 to 5 carbon atoms, an alkoxyl group or a SO ₃ M (M 1 to 5 carbon atoms are as defined above ) And the like, and the groups at both ends may be the same or different. m may be 0. The weight average molecular weight (Mw) of the compound represented by the general formula (2) is 1,000 to 100,000, preferably 3,000 to 50,000, more preferably 5,000 to 20,000. The polymerization form may be block or random.

Specific examples of the water-soluble polymer carboxylic acid represented by the general formula (2) include acrylic acid homopolymer, acrylic acid-maleic acid copolymer, α-hydroxyacrylic acid homopolymer, C ₅ olefin-maleic acid copolymer. Examples thereof include polymers, isobutylene-maleic acid copolymers, and alkali metal salts or amine salts thereof. Preferred are acrylic acid homopolymers and acrylic acid-maleic acid copolymers, and two or more water-soluble polymer carboxylic acids may be used in combination.

  The content of the water-soluble polymer carboxylic acid in the cleaning composition of the present invention is preferably 0.05 to 1% by weight from the viewpoint of water softening performance, detergency and low COD (chemical oxygen demand). More preferred is 0.1 to 0.5% by weight. By using 0.05% by weight or more, when water with high hardness such as industrial water is used, water-insoluble salts are formed with fatty acids and the like mixed with calcium ions and magnesium ions as dirt, resulting in poor cleaning. Can be effectively suppressed.

  Further, in order to reduce the viscosity of the cleaning liquid in the cleaning composition of the present invention, suppress foaming at the time of cleaning, and further reduce the drainage load at the time of rinsing immediately after cleaning (hereinafter referred to as preliminary rinsing). It is preferred to add ether. As glycol ethers, ethylene glycol monoalkyl (carbon number 1 to 12) ether, diethylene glycol monoalkyl (carbon number 1 to 12) ether, triethylene glycol monoalkyl (carbon number 1 to 12) ether, benzyl glycol, benzyl diglycol , Phenylalkyl, propylene glycol or monoalkyl (carbon number 1 to 12) ether of dipropylene glycol, monoalkyl (carbon number 1 to 12) ether of dialkyl glycol (carbon number 2 to 12), ethylene glycol Monohexyl ether, ethylene glycol mono 2-ethylhexyl ether, diethylene glycol monobutyl ether, diethylene glycol monohexyl ether, diethylene glycol mono 2-ethylhex Luether, triethylene glycol monobutyl ether, dipropylene glycol monobutyl ether, diethylene glycol dimethyl ether, and diethylene glycol dibutyl ether are preferred, and the washing method for reducing the drainage load of the rinsing liquid described in Japanese Patent No. 2539284 (hereinafter referred to as oil-water separation method) From the viewpoint of carrying out, diethylene glycol monohexyl ether, diethylene glycol mono 2-ethylhexyl ether, dipropylene glycol monobutyl ether, and diethylene glycol dibutyl ether are particularly preferable.

  When an alkaline agent is used in combination, ethylene glycol mono-2-ethylhexyl ether and diethylene glycol mono-2-ethylhexyl ether are particularly preferable from the viewpoint of enhancing the permeability of the cleaning liquid and suppressing the foaming property of the cleaning liquid.

  These glycol ethers may be used alone or in admixture of two or more.

As content of glycol ether, 0.01 to 40 weight% is preferable in a cleaning composition.
Among them, when washing precision parts and jigs and tools, the content of glycol ether is 0.01 to 40 from the viewpoint of washing at a high temperature with a cloud point of the cleaning agent of 30 ° C. or higher and performing an oil-water separation method. % By weight, more preferably 0.01 to 30% by weight, still more preferably 0.1 to 25% by weight, particularly preferably 0.5 to 20% by weight, and most preferably 0.5 to 15% by weight.
When cleaning hard surfaces such as metal, glass, ceramics, and plastics, it is preferable to use an alkali agent in combination. In this case, the content of glycol ether is preferably 0.02 to 40% by weight, more preferably 0.03 to 20% by weight, and 0.04 to 10% by weight from the viewpoint of enhancing the permeability to oil stains and suppressing foaming. Is more preferable, and 0.04 to 5% by weight is particularly preferable.

  Further, the cleaning composition of the present invention is a concentrated cleaning agent produced by adding a solubilizing agent for suppressing separation of the cleaning agent as necessary and a slurrying agent for making the appearance of the cleaning agent a white suspension. It can also be in the form of a composition.

  Examples of the solubilizer used in the present invention include fatty acids and salts thereof, and alkyl sulfates and salts thereof. Specifically, alkenyl succinic acids having 6 to 18 carbon atoms and salts thereof, caproic acid, enanthic acid, and capryl. Examples include acid, capric acid, lauric acid, butyric acid, valeric acid, isobutyric acid, 2-ethylhexanoic acid and salts thereof.

  Examples of the slurrying agent used in the present invention include the water-soluble polymer carboxylic acid, naphthalene dicarboxylic acid, naphthalene disulfonic acid or phthalic acid, and alkali metal salts or amine salts thereof.

  Further, the cleaning composition of the present invention includes an antifoaming agent that suppresses foam generated in the cleaning process, such as silicone, higher alcohol, higher fatty acid and salts thereof, pluronic copolymer, tetranic copolymer, polyethylene glycol. Polypropylene glycol and the like can also be blended.

  When the detergent composition of the present invention is provided in the form of a concentrated detergent, the composition is not particularly limited, but glyceryl ether is preferably 0.1 to 20 from the viewpoint of obtaining excellent product stability and pipe transportability. % By weight, more preferably 0.5-5% by weight, alkylglycosides are preferably 0.1-20% by weight, more preferably 0.5-5% by weight, olefinic hydrocarbons and / or paraffinic hydrocarbons are preferably 0.05 to 20 wt%, more preferably 0.1 to 5 wt%, glycol ether is preferably 0.1 to 20 wt%, more preferably 0.5 to 5 wt%, and the alkaline agent is preferably 1 to 50 wt%, More preferably, it is 15 to 45% by weight, and the solubilizer or slurrying agent is preferably 0.05 to 40% by weight, more preferably 0.1 to 10% by weight. Moreover, when a chelating agent is contained, 0.1 to 20% by weight is preferable, and 0.5 to 10% by weight is more preferable. If the cleaning composition is stable, a solubilizing agent or a slurrying agent may not be used.

  In the detergent composition of the present invention, other surfactants, antiseptics, rust preventives, silicones, etc., which are usually used in the detergent composition, if necessary, as long as the effects of the present invention are not impaired. An antifoaming agent etc. can be used together suitably.

  The cleaning composition of this invention which has the above structure can be manufactured by mixing the said component, arbitrary components, etc. by a conventional method. For example, the alkylglycoside, the glyceryl ether, the olefinic hydrocarbon and / or paraffinic hydrocarbon, and the glycol ether are mixed with stirring, and other optional components are mixed as necessary, and finally water is added. It can manufacture by adding.

  Moreover, it is preferable that the cleaning composition of the present invention is manufactured as a concentrated product, diluted with an aqueous medium such as water during cleaning, and used.

  The cleaning composition of the present invention can be applied to known cleaning methods for cleaning the surface of hard parts such as precision parts, jigs, metals, glass, ceramics, and plastics. For example, a cleaning process is performed using a stock solution of the cleaning composition of the present invention or a solution diluted with water, and then the object to be cleaned is cleaned through a rinsing process, a drying process, and the like. Accordingly, the present invention relates to a method for cleaning a hard surface using the cleaning composition.

  The physical power of the cleaning process and the rinsing process is not particularly limited, but various known cleaning methods such as an immersion method, an ultrasonic cleaning method, an immersion rocking method, a spray method, an electrolytic cleaning, and a hand wiping method may be used alone or in combination. Wash. Cleaning conditions such as temperature may be known conditions that are usually performed. For example, the temperature is preferably from room temperature to 90 ° C. or less, and 80 ° C. or less is more preferable in consideration of water evaporation.

  In addition, the cleaning composition of the present invention is effective when cleaning metals, glass, ceramics, plastics, etc. at low temperatures, and in particular, continuous cleaning of steel sheets in steelworks, that is, immersion cleaning, spray cleaning, brush cleaning. The effect can be exhibited in electrolytic cleaning and the like.

  The cleaning composition of the present invention can also be used for cleaning by an oil-water separation method that reduces the drainage load of the rinsing liquid.

  Among these, the cleaning composition of the present invention has a particularly excellent effect for cleaning precision parts and jigs and tools used in the assembly process.

The precision component in the present invention refers to, for example, an electronic component, a metal component, an electric component, a resin processed component, an optical component, and the like.
Examples of the electronic component herein include liquid crystal panels, semiconductor packages, printed wiring boards, IC leads, semiconductor materials such as silicon and ceramic wafers, and crystal resonators. The metal parts include, for example, bearings used in precision drive devices, plastic processed products such as deep pots and cans of electronic pots and electronic jars. Examples of the electric parts include electric motor parts such as brushes, rotors, and housings. Examples of the resin processed product include precision resin processed parts used in cameras, automobiles, and the like. Examples of the optical component include a lens used in a camera, glasses, and optical equipment.

  In the present invention, the jigs and tools used in the assembling process include jigs and tools that handle precision parts as shown in the above-mentioned examples of various parts in various processes such as manufacturing, processing, assembling and finishing. This refers to various devices that handle precision parts, and their parts.

  The cleaning composition of the present invention includes the liquid crystal stains present in the gaps of the liquid crystal panel, the semiconductor package, the flux remaining on the printed wiring board, the processing oil adhering to the surface after cutting the silicon ingot, and the metal parts. However, the precision parts and jigs and tools that are the object of cleaning of the present invention are not limited to these examples. Precision parts and tooling tools with solid surfaces of fixed shape to which various processing oils, post-process interference substances such as liquid crystals and fluxes, or various oily contaminants that deteriorate the properties of products are attached in the processing process If so, the cleaning composition of the present invention can be applied.

  Furthermore, the cleaning composition of the present invention is particularly effective when these pollutants are mainly organic oil stains such as fats, oils, machine oils, cutting oils, greases, rosin fluxes, liquid crystals, and petroleum pitches. Also, it exhibits high detergency against dirt mixed with metal powder, inorganic powder, moisture and the like.

<Production of test substrate>
A TFT (thin film transistor) liquid crystal was sealed in a gap of a liquid crystal cell (a gap distance of 5 μm), and the test substrate was allowed to stand at room temperature for 30 minutes.

Examples 1-6, Comparative Examples 1-3
Each component was added and mixed so that it might become a composition shown in Table 1, and the cleaning composition of Examples 1-6 and Comparative Examples 1-3 was prepared, respectively. In the prepared cleaning composition at 40 ° C., the test substrate was subjected to ultrasonic cleaning (39 kHz, 200 W) for 10 minutes, and then rinsed in 4 pure water tanks (40 ° C.) for 3 minutes. It dried for 30 minutes with a 90 degreeC hot air dryer, and was set as the observation sample.

[Liquid crystal detergency evaluation method]
The liquid crystal remaining in the gap of the liquid crystal cell after washing, and the mixture of the liquid crystal and the detergent composition that was not sufficiently discharged at the time of rinsing were observed with a polarizing microscope (25 times magnification), and the detergency of the liquid crystal panel was observed. evaluated.
The liquid crystal detergency evaluation was represented by a value obtained by dividing the total area of the observed gap by subtracting the total area of the portion where the liquid crystal and the mixture of the liquid crystal and the cleaning agent remained from the total area of the observed gap. The evaluation criteria were determined as follows.
[LCD cleanability evaluation criteria]
◎: 90% or more ○: 80 to less than 90% △: 40 to less than 80% ×: less than 40%

(Repeatability)
In order to evaluate the repetitive cleaning properties of the cleaning liquid, the liquid crystal saturated dissolution concentration was examined. Add 0.02g of TFT liquid crystal to 20g of cleaning composition kept at 40 ° C and hold at 40 ° C for 3 minutes. In this state, the state of the liquid is confirmed. If it is transparent, it is determined that the solution is dissolved, and the same operation is repeated. This operation was repeated, and the saturated dissolution concentration was calculated from the amount obtained by subtracting 0.01 g from the amount of liquid crystal at which the cleaning liquid began to become cloudy, and defined as the liquid crystal saturation dissolution concentration.

For example, assuming that 0.24 g of TFT liquid crystal is added for the first time, the liquid crystal saturation dissolution concentration is calculated as (0.24-0.01) / (20 + 0.24-0.01) × 100. Using such a liquid crystal saturated dissolution concentration, the washability was repeatedly evaluated based on the following evaluation criteria.
[Repeatability evaluation criteria]
◎: 2% or more ○: 1% or more to less than 2% △: 0.5% or more to less than 1% ×: Less than 0.5%

(Rinse water evaluation)
In order to evaluate the liquid state of the rinse water, 5% by weight aqueous solution of each cleaning solution was prepared as a pre-rinsing solution, and 0.5% by weight aqueous solution of each cleaning solution was prepared as a rinsing solution, and these pre-rinsing solutions and rinses at 60 ° C. The state of the liquid was observed and evaluated as rinse water.

(Rinsability evaluation)
1. 18 sheets of glass panels (35 × 48 mm) were immersed in a 10 wt% aqueous solution (500 g) of a cleaning solution (60 ° C.) for 10 minutes.
2. Then, the panel was slowly pulled up over 20 seconds and immersed in the first rinsing tank containing 500 g of pure water at 60 ° C. (2 minutes).
3. Similarly, the panel was pulled up and immersed in a second rinsing tank containing 500 g of pure water at 60 ° C. (2 minutes).
4. Next, in an extraction tank (ultrasonic tank) with pure water maintained at 70 ° C., rinsing was performed for 10 minutes with ultrasonic waves (38 KHz, 400 W) in order to extract the cleaning agent component remaining on the panel surface.
5. Next, measure the organic matter concentration of the rinse water in each rinse tank (first and second) and the extracted water in the ultrasonic tank by TOC (Total Organic Carbon Meter), and then the oil content in the first rinse tank according to the following formula. The removal rate was calculated.
Formula: Oil removal rate of first rinsing tank (%) =
(Weight of organic substance in first rinsing tank) / (weight of organic substance in first rinsing tank + weight of organic substance in second rinsing tank + weight of organic substance in ultrasonic tank) × 100

The following evaluation was made on the oil removal rate of the first rinsing tank.
◎: Oil removal rate of the first rinsing tank is 90% or more ○: Oil removal ratio of the first rinsing tank is 70% or more but less than 90% △: Oil removal rate of the first rinsing tank is 50% or more but less than 70% ×: Oil removal rate of the first rinsing tank is less than 50%

  In Examples 1 to 5 in Table 1, the preliminary rinse water and the rinse water are also transparent, the rinse property is high, and the liquid crystal solubility is high. It can be seen that there is no mixture of the above, and high liquid crystal detergency is exhibited. Moreover, in Example 6, it is a cleaning composition which can perform the oil-water separation method, and although preliminary rinse water becomes cloudy, since rinse water is transparent, it was shown that a washing | cleaning component can fully be rinsed. .

  On the other hand, in Comparative Examples 1 and 2, the rinsing water is transparent, but does not contain hydrocarbons, so that it has no liquid crystal solubility and low liquid crystal detergency. Therefore, in industrial cleaners that repeatedly wash with the same cleaning solution, these cleaning solutions do not have sufficient performance. Moreover, although the comparative example 3 contains a hydrocarbon and has a liquid crystal solubility, it turns out that a rinse property is inferior and, as a result, a liquid-crystal detergency falls.

Examples 7 to 10 and Comparative Examples 4 to 7 (However, Examples 7 to 10 are reference examples.)
Each component was added and mixed so that it might become a composition shown in Table 2, and the cleaning composition (remaining amount is deionized water) of Examples 7-10 and Comparative Examples 4-7 was prepared, respectively, and the following method Thus, a steel plate cleaning test was performed, and the cleaning properties, foaming properties and foaming properties of the steel plates were evaluated. The results are shown in Table 2.

<Steel plate cleaning test>
(1) Steel plate to be cleaned All the steel plates to be cleaned were prepared by cutting a steel plate having an adhesion oil amount of 350 mg / m ² cold-rolled to a thickness of 0.5 mm into a size of 50 mm long × 25 mm wide.

(2) Preparation of pseudo-deteriorated cleaning liquid A scum extracted oil obtained by extraction with hexane from scum deposited and deposited on a rolling mill is added to the cleaning composition so as to be 1.0% by weight in the cleaning composition. A pseudo-deteriorated cleaning solution was prepared by sufficiently stirring.

(3) Cleaning and rinsing method Equal distance from a pair of electrode plates each having a size of 100 mm in length and 50 mm in width (distance between the electrode plates is 20 mm) in the cleaning composition (clean solution without dirt) and pseudo-deteriorated cleaning solution. In addition, the steel plate to be cleaned was immersed in the center for 1 second, and then the steel plate potential was switched once from negative to positive at a current density of 10 A / dm ² . Subsequently, water spray rinsing (water temperature 20 ° C., water pressure 0.2 MPa) was carried out for 1 second at a position 10 cm from the spray head, followed by hot air drying. The temperature of the test cleaning solution was 40 ° C.

(4) Evaluation of steel plate detergency (method for measuring the amount of residual adhered oil)
For the cleaning solution without dirt and the pseudo-deterioration cleaning solution, the amount of oil adhered to the steel sheet after cleaning and rinsing was measured using a steel sheet adhesion oil content measuring device “EMIA-111” (manufactured by Horiba, Ltd.), and the average of five sheets was measured. The washability of the steel sheet was evaluated according to the following criteria. The evaluation using the pseudo-deteriorating cleaning liquid is a cleaning performance evaluation of repetitive cleaning performance assuming a case where oil adhering to the steel plate surface accumulates in the cleaning tank. As an evaluation standard for detergency, it is acceptable if the amount of residual adhered oil after measurement is less than 45 mg / m ² .

(5) Foaming property evaluation Foaming property evaluation was performed as follows.
A 25 ml test tube was filled with 10 ml of washing liquid, and the liquid temperature was kept at 40 ° C. Thereafter, the test tube was shaken 10 times by hand, and the volume of the washing liquid immediately after standing and the foam height was evaluated as the initial foam height. The volume of the same washing liquid and bubble height after holding the test tube at 40 ° C. for 1 minute was defined as the bubble height after standing for 1 minute. The standard for foaming evaluation is acceptable if the initial foam height (initial foaming property) is 16 ml or less and the foam height after standing for 1 minute (foaming property) is 11 ml or less.

  From the results shown in Table 2, the detergent compositions obtained in Examples 7 to 10 are superior to those obtained in Comparative Examples 4 to 7 in terms of cleanability of the steel sheet and have low foaming properties. I understand that.

Example 11 (However, Example 11 is a reference example.)
After preparing a detergent composition having the composition before dilution shown in Table 3 (remaining amount is deionized water), prepare a test cleaning solution by diluting with deionized water to the concentration after dilution shown in Table 3. I did . For this cleaning liquid performs steel cleaning test in the same manner as in Example 7-10, the cleaning of the steel sheet, foaming properties were evaluated defoaming properties. The results are shown in Table 3.

  From the results in Table 3, it can be seen that the detergent composition obtained in Example 11 is similarly excellent in the cleanability of the steel sheet and has low foaming properties.

  The cleaning composition of the present invention includes, for example, electronic parts, metal parts, electrical parts, resin processed parts, precision parts such as optical parts, jigs that handle the precision parts in various processes such as manufacturing, processing, assembly, and finishing, In addition to tools, it can be suitably used for cleaning various devices that handle these precision parts, and jigs and tools used in the assembly process of the parts.

Claims (7)

A hard surface cleaning composition comprising an alkyl glycoside, 2-ethylhexyl glyceryl ether, an olefinic hydrocarbon and / or a paraffinic hydrocarbon, and water, wherein the weight ratio of alkyl glycoside / 2-ethylhexyl glyceryl ether is 3 10 to 10, a hard surface cleaning composition .   2. The hard surface cleaning composition according to claim 1, wherein the hydrocarbon is a compound having 10 to 18 carbon atoms. The content in the detergent composition is 0.01 to 80% by weight of alkyl glycoside, 1 to 5.3% by weight of 2-ethylhexyl glyceryl ether, 0.005 to 80 % by weight of olefinic hydrocarbon and / or paraffinic hydrocarbon , and water 5 to claim 1 or 2 hard surface cleaning composition according 98% by weight. Furthermore, the cleaning composition for hard surfaces in any one of Claims 1-3 containing an alkaline agent. Furthermore, the cleaning composition for hard surfaces in any one of Claims 1-4 containing a chelating agent and / or water-soluble polymeric carboxylic acid. Furthermore, the cleaning composition for hard surfaces in any one of Claims 1-5 containing glycol ether. The method to wash | clean a hard surface using the cleaning composition in any one of Claims 1-6 .