JP7031412B2 - Detergent composition and cleaning method using it - Google Patents

Description

The present invention relates to a detergent composition containing water, 1-heptanol and a water-soluble solvent, and a cleaning method using the same.

More specifically, it has excellent detergency against stains such as processing oils and fluxes adhering to parts handled in various industrial fields such as automobiles, machines, precision equipment, electricity, and electronics, and has good drying properties. The present invention relates to a non-flammable detergent composition and a cleaning method using the same.

In order to remove stains adhering to metal parts, electronic parts, semiconductor parts, etc. in various industrial fields, various cleaning agents such as chlorine-based solvents, hydrocarbon-based cleaning agents, glycol ether-based cleaning agents, water-based cleaning agents, and quasi-water-based cleaning agents are used. Cleaning agents are used.

However, chlorine-based solvents are highly harmful to the human body and the environment, and are subject to many laws and regulations, so there is a problem that they are difficult to handle. Hydrocarbon-based cleaning agents and glycol ethers are flammable, so it is necessary to take measures such as making the cleaning equipment explosion-proof and requiring fire-proof equipment, and the handling amount is as stipulated in the Fire Service Act. The larger the scale, the more sufficient management is required. Water-based cleaning agents and semi-water-based cleaning agents do not need to be used as explosion-proof equipment because they are not flammable. However, since these cleaning agents contain non-volatile components such as surfactants, pure water, etc. are used after cleaning. It is necessary to perform rinsing cleaning at the site, and a large amount of cost and equipment are required for wastewater treatment. In addition, since it cannot be reused by distillation recovery or the like, there are many problems such as complicated liquid management and periodic replacement of the cleaning agent and the rinsing agent.

To solve these problems, non-chlorine-based non-flammable cleaning agents that do not contain a surfactant have been proposed (see, for example, Patent Documents 1 to 5), but in each case, the solubility of oil is high. Due to its poor detergency, its detergency is insufficient, and it is not possible to satisfy all the required performances such as dryness and recoverability.

Japanese Unexamined Patent Publication No. 8-283973 Japanese Unexamined Patent Publication No. 9-255995 Japanese Unexamined Patent Publication No. 11-19986 Japanese Unexamined Patent Publication No. 2004-238442 Japanese Unexamined Patent Publication No. 2004-107561

An object of the present invention is that it has high detergency against stains such as processing oil and flux, does not require other rinsing liquid such as pure water, can be dried as it is after cleaning, and can be repeatedly reused by distillation recovery or the like. It is an object of the present invention to provide a non-flammable detergent composition capable of stable cleaning without phase separation.

As a result of various studies to solve the above-mentioned problems, the present inventors have surprisingly made a certain solvent mixture into a non-flammable solution by adding water in order to eliminate the flammability. It has been found that the oil solubility required for cleaning parts and the like can be maintained even at a certain water concentration, and the present invention has been completed.

That is, the detergent composition of the present invention is a non-flammable detergent composition containing water, 1-heptanol and a water-soluble solvent.

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

The water in the cleaning agent of the present invention is not particularly limited as long as it has an effect of extinguishing the ignition point of the cleaning agent composition, has few impurities, has an effect on parts and a cleaning machine, and has an effect on the finished quality after cleaning. Those having little influence, such as distilled water and ion-exchanged water, can be preferably used.

Here, non-flammable means that ignition is not recognized by the Cleveland open flash point measurement method (JIS K 2265).

1-Heptanol in the detergent of the present invention is a solvent having low harmfulness and excellent drying property. When water is added to this, water undergoes phase separation at room temperature, but when a certain amount of water-soluble solvent is further added, it dissolves into a uniform solution, has no flash point, and exhibits good detergency. The solvent containing 1-heptanol has problems such as detergency and uneven cleaning when water is added to eliminate the flash point.

The water-soluble solvent in the cleaning agent of the present invention is not particularly limited, and is a water-soluble solvent that is compatible with water even at about 30 ° C. or higher. Depending on the compounding ratio, the boiling point is preferably 230 ° C. or lower because it causes deterioration of drying property and the like. For example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol. Monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol isopropylmethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, dipropylene Glycol ethers such as glycol, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether; glycols such as ethylene glycol, diethylene glycol, propylene glycol, hexylene glycol and isoprene glycol; 3-methoxy-1-butanol, 3-methyl Examples thereof include methoxybutanols such as -3-methoxy-1-butanol; lactic acid esters such as methyl lactate and ethyl lactate; cyclic ether alcohols such as tetrahydrofurfuryl alcohol and furfuryl alcohol; gamma butyl lactone and the like. These can be used alone or in admixture of two or more.

Among the above water-soluble solvents, those having a boiling point of 170 ° C. or higher and 230 ° C. or lower are preferable because the composition change from 1-heptanol is small. Specifically, propylene glycol, dipropylene glycol monomethyl ether, 3-methyl-3-methoxy-1-butanol, diethylene glycol isopropylmethyl ether, diethylene glycol monoisobutyl ether and the like are preferable, and dipropylene glycol monomethyl ether and diethylene glycol are particularly preferable. Isopropylmethyl ether and diethylene glycol monoisobutyl ether.

The water, 1-heptanol, and water-soluble solvent of the cleaning agent composition of the present invention exhibit excellent effects as the desired cleaning agent composition only when all the components are blended, and particularly the oil content such as processing oil and the like. It is a composition suitable for cleaning stains containing flux and the like. That is, a composition in which only water and 1-heptanol are blended is not uniform, or a composition in which only water and a water-soluble solvent are blended to make it non-flammable has low oil solubility and sufficient detergency can be obtained. I can't. Further, a composition containing only 1-heptanol and a water-soluble solvent becomes a flammable solution.

Regarding the ratio in the detergent composition of the present invention, from the viewpoint of detergency and flammability extinguishing action, water is preferably 5% by volume or more and 30% by volume or less, and particularly preferably 10% by volume or more and 25% by volume or less. .. From the viewpoint of oil solubility and non-flammable composition, 1-heptanol is preferably 5% by volume or more and 60% by volume or less. From the viewpoint of oil solubility and water separation, the water-soluble solvent is preferably 30% by volume or more and 85% by volume or less.

The detergent composition of the present invention may further contain other polyhydric alcohol derivatives, esters, ethers and the like as long as the performance of the composition is not impaired. In addition, antioxidants such as 2,6-di-tert-butyl-p-cresol (BHT), timole, and pyrocatechin, irons such as aminoalcohols, alkylamines, benzotriazoles, and benzothiazoles, copper, etc. It may further contain a corrosion inhibitor such as zinc and a rust inhibitor.

Since the detergent composition of the present invention does not contain a non-volatile substance such as a surfactant and is composed of easily volatile components, it does not require another rinsing liquid and can be dried as it is after cleaning. After cleaning, the object to be cleaned can be subjected to the drying methods used for conventional cleaning agents such as warm air drying, suction drying, rotary drying, and vacuum drying.

It is also possible to rinse with water or a low boiling point solvent such as isopropyl alcohol after washing and then dry.

The detergent composition of the present invention separates stain components from a liquid contaminated in cleaning such as stains such as processing oil by a batch type or continuous type distiller without causing a change in composition or deterioration of cleaning performance. It is possible to collect it and use it repeatedly. The distiller used is not particularly limited, but a vacuum (vacuum) distiller is usually preferable.

Further, in the detergent composition of the present invention, a poor solvent for stains such as water can be added to phase-separate the stains dissolved by cleaning, and the separated stains can be removed by an oil-water separator or the like. be. Oil-water separation depends on the oil content separation accuracy, such as the conventional oil-water separation method that separates using the difference in specific gravity, the oil-water separation method that efficiently separates through a corelesser, and the method that separates by a filter or ultrafiltration membrane. The liquid after separation can be recovered as a cleaning agent by distillation or phase separation.

The detergent composition of the present invention can be applied to remove stains such as processing oils and fluxes, as well as waxes, greases, inks, resists, buffs and the like.

The cleaning method for cleaning parts to which processing oil or flux is attached using the cleaning agent composition of the present invention is not particularly limited, and is, for example, ultrasonic cleaning, jet cleaning, immersion cleaning, and rocking cleaning. , Rotational cleaning, shower cleaning, spray cleaning, vacuum cleaning, etc. can be used, and can be carried out individually or in combination of several types in consideration of the required cleanliness, required time, and the like.

The cleaning agent composition of the present invention has excellent detergency against processing oils and the like adhering to parts and the like handled in various industrial fields such as automobiles, machines, precision equipment, electricity, and electronics, and does not require other rinsing liquids and after cleaning. It can be dried as it is, can be reused repeatedly by distillation recovery, etc., and is non-flammable and can be safely washed.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto.

<Cleanability test>
Prepare two types of commercially available water-insoluble cutting oils A and B, add 0.2 ml to 10 ml of various detergent compositions, shake well, observe the state of dissolution, and wash according to the following evaluation criteria. Sexual evaluation was performed. The results are shown in Table 1.

Evaluation criteria ◎: Both A and B dissolve
◯: Either A or B dissolves
×: Neither A nor B dissolves <flash point measurement>
The flash point was measured using a Cleveland open flash point measuring instrument in accordance with JIS K 2265.

Evaluation criteria: ○: No flash point ×: With flash point The meanings of the abbreviations in the table are as follows.
DEGIB: Diethylene glycol monoisobutyl ether DEGIPM: Diethylene glycol isopropylmethyl ether DPGM: Dipropylene glycol monomethyl ether MMB: 3-Methyl-3-methoxy-1-butanol PG: Propylene glycol DPGB: Dipropylene glycol monobutyl ether (water-insoluble solvent)
DPG: Dipropylene Glycol Examples 1-10
A detergent composition containing water, 1-heptanol and a water-soluble solvent shown in Table 1 was obtained and evaluated.

Comparative Examples 1 to 10
The detergent compositions shown in Table 1 were obtained and evaluated.

Comparative Examples 10 and 1 without water, Comparative Examples 3 and 9 without 1-heptanol, and Comparative Examples 1 and 2 without a water-soluble solvent are inferior in detergency and flash point to the detergent composition of the present invention. Met.

Claims (4)

A cleaning agent composition comprising water, 1-heptanol and a water-soluble solvent, wherein the water-soluble solvent is ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl. Ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, diethylene glycol isopropylmethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, dipropylene glycol , Dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, ethylene glycol, diethylene glycol, propylene glycol, hexylene glycol, isoprene glycol, 3-methoxy-1-butanol, 3-methyl-3-methoxy-1-butanol, lactic acid A cleaning composition comprising one or more selected from methyl, ethyl lactate, tetrahydrofurfuryl alcohol, furfuryl alcohol, and gamma butyl lactone . The claim is characterized in that the water-soluble solvent is at least one selected from diethylene glycol monoisobutyl ether, diethylene glycol isopropylmethyl ether, propylene glycol, dipropylene glycol monomethyl ether, and 3-methyl-3-methoxy-1-butanol. The cleaning agent composition according to 1. The invention according to claim 1 or 2, wherein the water content is 5% by volume or more and 30% by volume or less, 1-heptanol is 5% by volume or more and 60% by volume or less, and the water-soluble solvent is 30% by volume or more and 85% by volume or less. Detergent composition. A method for cleaning a part to which any of processing oil, flux, wax, grease, ink, resist, or buff is attached, using the detergent composition according to any one of claims 1 to 3.