JPH09241684A - Cleaning composition and cleaning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cleaning composition composed of guanidine carbonate, a water-soluble solvent and water at specific ratios and capable of cleanly removing particulate stain, grease of hand, etc., attached to a cleaning object such as a working metal part without leaving the residue. SOLUTION: This cleaning composition is composed of (A) 0. 01-10vol.% of guanidine carbonate, (B) 40-60vol.% of a water-soluble solvent (preferably alcohols, ketones, etc.) and (C) the remaining part of water. The cleaning with the cleaning composition is preferably carried out at <60 deg.C to prevent the hydrolysis of the component A. Preferably, the cleaned material is rinsed with hot water of >=80 deg.C and dried at >=80 deg.C to prevent the formation of residue caused by the hydrolysis of the component A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition used for industrially cleaning an object to be cleaned such as metal processed parts, resin molded parts, glass molded parts, ceramic processed parts, and the like. The cleaning method used.

[0002]

2. Description of the Related Art Halogen-containing organic solvents typified by CFCs and trichloroethane are used for industrial applications such as metal working parts, resin molding parts, glass molding parts, and ceramic machining parts. This is because this halogen-containing organic solvent has high chemical stability, flame retardancy, high detergency, and nontoxicity. However, due to environmental destruction on a global scale, the use of these fluorocarbons and trichloroethane has been decided to be completely abolished. Also, other chlorine-containing organic solvents as substitutes for these have similar effects to CFCs, and thus their use is expected to be limited.

For these reasons, the cleaning agents are being changed to water-based, semi-water-based, or non-aqueous cleaning agents that do not use CFCs or chlorine-containing organic solvents. Among them, a substitute for water-based and semi-water-based cleaning agents has been developed as a highly safe cleaning agent in terms of influence on the human body and ignition. For example, JP-A-3-162946 proposes a cleaning composition containing a water-soluble solvent and water as main components.

[0004]

However, in the above-mentioned cleaning composition, liquid stains such as working oil, cutting oil, machine oil and rust preventive oil adhering to the surface of the object to be cleaned can be cleaned, but they are generated in the processing step. There is poor cleaning performance for metal dirt, resin burr scraps, abrasive grains, ceramic shavings, etc. contained in liquid dirt, and hand grease adhered by workers during processing. It often remains on the surface of the object to be cleaned without being cleaned.

Since these remain as residues after cleaning, a step such as manual wiping is required for cleaning the parts where appearance is important. This requires a very large number of man-hours when the required accuracy of cleaning is high, the shape of the object to be cleaned is complicated, and the material of the object to be cleaned is easily corroded. I have a problem.

The present invention has been made in consideration of such conventional problems, and an object of the present invention is to provide a cleaning composition having good cleaning properties for particle dirt and hand fat. Another object of the present invention is to provide a cleaning method capable of effectively exhibiting the ability of this cleaning composition.

[0007]

The cleaning composition of the present invention comprises:
It is characterized by comprising 0.01 to 10 vol% of guanidine carbonate, 40 to 60 vol% of a water-soluble solvent, and the balance being water. In this case, the water-soluble solvent is at least one of alcohols, ketones, lactic acid esters, glycols and glycol ethers which are completely compatible with water.

The cleaning method of the cleaning method of the present invention comprises a cleaning step of cleaning an object to be cleaned using the above-mentioned cleaning composition, a rinsing step of rinsing the cleaned object to be cleaned with water, and a water step. After the rinsing, it consists of a drying process in which the object to be cleaned is heated to 80 ° C or higher and dried. Further, in this cleaning method, it is preferable to perform the above-described rinsing step with warm water of 80 ° C. or higher.

In order to solve the above-mentioned problems, as a result of the study by the present inventor, it was found that a mixture of an aqueous solution and a water-soluble solvent in which guanidine carbonate was added to water to make the liquid alkaline was favorable. . The guanidine carbonate aqueous solution exhibits strong alkalinity and is effective for cleaning hand oil and particle dirt. This alkaline aqueous solution has a function of neutralizing the charge of particles electrostatically attached to the surface of the object to be cleaned and dispersing the particles. Further, by adding a water-soluble solvent to this, the aqueous solution of guanidine carbonate becomes slightly lipophilic, which increases the detergency of oil stains such as processing oil.

The mixing ratio of water, guanidine carbonate and water-soluble solvent is 0.01 to 10 vol% of guanidine carbonate, 40 to 60 vol% of water-soluble solvent, and the balance is water. If the composition of guanidine carbonate is less than 0.1 vol%, the absolute amount of guanidine carbonate is small, resulting in a weak alkaline pH of less than 9, resulting in poor hand-fat cleaning properties and particle cleaning properties, and the required cleaning quality. Can't get On the other hand, 10 vo
If it exceeds 1%, it becomes difficult to dissolve guanidine carbonate,
Even with a slight change in composition such as evaporation of water or a change in temperature, the dissolved amount of guanidine carbonate reaches saturation and precipitates, which is not preferable for use.

Further, guanidine carbonate is 80 ° C. in an aqueous solution.
It has the property of being hydrolyzed by the above heating. Inorganic soda salts and alcohol amines, which are organic alkalis, used as ordinary alkaline agents have poor water rinsing properties and have a problem of leaving residue after drying after water rinsing, but guanidine carbonate is especially hot water at 80 ° C or higher. Rinsing at gives a hydrolysis chemistry. Therefore, it has an advantage that it has a high water rinsing property and that no residue remains in the drying step due to the temperature of 80 ° C. or higher and the action of hydrolysis by the rinse water.

The composition of the water-soluble solvent used in the present invention is 4
If it is less than 0 vol%, the cleaning property of oil stains such as processing oil is extremely poor, and the required cleaning quality cannot be obtained. On the other hand, 60v
If it exceeds ol%, there is a problem that the risk of ignition becomes high and the amount of use and storage as a dangerous substance is limited even under the Fire Service Law, which is not preferable. The water-soluble solvent is preferably a solvent that is completely compatible with water. Although the cleaning agent of the present invention can obtain high cleaning quality by water rinsing, a water-soluble solvent that is completely compatible with water is used in order to smoothly perform this water rinsing.

As the water-soluble solvent, those which have good detergency such as processing oil and good water rinsing property include alcohols such as ethanol and isopropyl alcohol, ketones such as acetone and methyl ethyl ketone, methyl lactate and ethyl lactate. Lactic acid esters such as, glycols such as ethylene glycol and propylene glycol, diethylene glycol methyl ether, ethylene glycol butyl ether, dipropylene glycol methyl ether, 3-
These are glycol ethers such as methoxy-methylbutanol, and one or more of these can be used.

FIG. 1 shows the cleaning method of the present invention in which the above cleaning composition is used for cleaning. The washing step is a step of washing with the above-mentioned washing composition, and the washing object is washed by using ultrasonic waves, a jet flow and a low-foaming shower or bubbling as a physical force. The washing temperature should be set so that the main component, guanidine carbonate, does not hydrolyze, and therefore it is desirable to wash at a temperature of, for example, less than 60 ° C.

After the cleaning, the cleaned object is rinsed with water. Similar to the washing step, this rinsing step can use any physical force. It is desirable to use high-purity water such as ion-exchanged water as the water used, especially when high cleaning quality is required. The temperature of the rinse water can be widely used from normal temperature to boiling water,
Applying the hydrolysis property of guanidine carbonate, rinsing at 80 ° C. or higher is effective and preferable. The effect of this heating has the effect of shortening the time of the subsequent drying process. In the drying step, heating is performed at 80 ° C. or higher for the same reason as in the rinse step. The cleaning method of the present invention as described above can perform high-quality cleaning by setting the temperature according to the properties of the cleaning composition.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) A cleaning composition having the following composition was prepared. Guanidine carbonate 5 vol%: Specific gravity at 30 ° C is 1.2
5 was used for weight measurement and volume conversion was performed. Ethyl alcohol 50 vol%: Wako Pure Chemical Industries, Ltd. first-grade ion-exchanged water 45 vol%: conductivity 0.5 μs / cm After dissolving guanidine carbonate in the above-mentioned components of ion-exchanged water, ethyl alcohol was added with stirring to adjust. .

Detergency was confirmed using the cleaning composition thus obtained. A commercially available slide glass was used as an object to be cleaned, and hand grease and an abrasive were used for the dirt. Hand fat was applied and then heat-treated at 80 ° C. for 1 hour, and the abrasive used was water-soluble and similarly heated at 80 ° C. for 1 hour and dried.

In the cleaning method shown in FIG. 1, the cleaning composition described above is used by being stored in the cleaning step. Washing temperature is 25
Ultrasonic waves with an output of 40 kHz and a physical force of 300 W were used. In the rinsing step, ion-exchanged water having an electric conductivity of 0.5 μs / cm was used as rinsing water while being stored. The rinse water was heated to 80 ° C. Output 40 as a physical force to the rinse
Ultrasonic waves of kHz and 300 W were used. Drying process is 80 ℃
Hot air was used. The time required for each step is 120 seconds for the washing and rinsing steps and 300 seconds for the drying step.

As Comparative Example 1, a cleaning composition containing no guanidine carbonate was prepared. (Comparative Example 1) Ethyl alcohol 50 vol%: Wako Pure Chemical Industries, Ltd. first-grade ion-exchanged water 50 vol%: conductivity 0.5 μs / cm

With respect to the results of the cleaning, both the cleaning composition of the present embodiment and the cleaning composition of the comparative example were cleaned with 10 (N) samples each, the hand oil was evaluated under breath under a fluorescent lamp, and the abrasive was fluorescent. Visual evaluation was performed under a light. Table 1 shows the evaluation results.

[0021]

[Table 1]

Further, various stains were washed using a SUS press plate having a size of 150 mm × 100 mm × 1 mm. The stains were lanolin and grease as magic ink (trade name) stains used as line drawing during processing, water-soluble processing oils, lipophilic processing oils and severe oil stains. The washing was performed according to the washing method described above except that the washing time was arbitrarily set. Regarding the cleaning time, the time until complete cleaning was measured while performing cleaning evaluation. The results of soil type and cleaning time are shown in Table 2.

[0023]

[Table 2]

As shown in Table 1, it was confirmed that the cleaning composition of the present embodiment has a very high cleaning power for the abrasives which are hand grease and particle stains. Further, as shown in Table 2, various stains can be washed within 3 minutes (180 seconds), and a wide range of stains can be dealt with. Further, in both the slide glass and SUS plate tests, the cleaning composition of the present embodiment and the ones cleaned by the above cleaning method showed no residue due to poor rinsing and good rinsing properties. It was confirmed that there is.

(Embodiment 2) A cleaning composition having the following composition was prepared. Guanidine carbonate 10 vol%: Specific gravity at 30 ° C. is 1.
25 was used for weight measurement and volume conversion was performed. 3-Methoxy-3-methylbutanol 60 vol%:
Wako Pure Chemical Industries, Ltd. First-grade ion-exchanged water 30 vol%: conductivity 0.5 μs / cm After guanidine carbonate was dissolved in the above-mentioned ion-exchanged water, 3-methoxy-3-methylbutanol was added little by little while stirring. I adjusted it. This cleaning composition has no flash point and is classified as a non-dangerous substance under the Fire Service Law.

As Comparative Example 2, a cleaning composition was prepared using isopropanolamine, which is an alcohol amine, instead of guanidine carbonate. (Comparative Example 2) Isopropanolamine 10 vol%: Wako Pure Chemicals Reagent 3-methoxy-3-methylbutanol 60 vol%:
Kuraray Co., Ltd. ion-exchanged water 30 vol%: conductivity 0.5 μs / cm After isopropanol amine was dissolved in the above-mentioned component ion-exchanged water, 3-methoxy-3-methylbutanol was added little by little while stirring. It was adjusted.

The cleaning was carried out based on FIG. 1, and the cleaning composition of this embodiment was used in the reservoir in the cleaning step. The washing temperature was 60 ° C. and rocking was used as the physical force. The rocking was performed once per second and the rocking width was 50 mm. In the rinsing step, ion-exchanged water having an electric conductivity of 0.5 μs / cm was used as rinsing water while being stored. The rinse water was heated to 80 ° C., and the rinsing process was subjected to rocking under the same conditions as the washing process as a physical force. Hot air of 120 ° C. was used in the drying step. The time required for each step is 60 seconds for the washing and rinsing steps and 300 seconds for the drying step.

A clean slide glass was washed by the above washing method, and a rinsing property comparison test was conducted. The number of slide glass was 20 (N), and the evaluation was performed under a fluorescent lamp. As a result, all 20 of the cleaning agents of the present embodiment had no residue and were evaluated as ∘, and Comparative Example 2 was evaluated as x, since 3 out of 30 had residues.

As described above, the good result of the rinsing property of this embodiment is obtained in addition to the good rinsing property of the cleaning composition of this embodiment. Due to the consistent results.

(Embodiment 3) A cleaning composition having the following composition was prepared. Guanidine carbonate 0.1 vol%: Weighed using a specific gravity of 1.25 at 30 ° C. and converted into volume. Ethyl alcohol 60 vol%: Wako Pure Chemical Industries, Ltd. first-grade ion-exchanged water 39.9 vol%: Conductivity 0.5 μs /
cm Guanidine carbonate was dissolved in the above-mentioned component ion-exchanged water, and ethyl alcohol was added with stirring to adjust.

The cleaning composition of the present embodiment was used to clean the metal processed product after the sandblasting step for making the surface satin. The metalworking product used was a ground product of SPCC, 200 of which were washed and evaluated. As stains on this metal processed product, water-soluble cutting oil diluted with city water to 10% (manufactured by Idemitsu Kosan Co., Ltd., product name "Daphne Aqua Cool")
Then, grinding sand made of # 120 mesh aluminum oxide is attached.

In the cleaning step, the cleaning composition according to the present embodiment was used by being stored. The cleaning temperature was 25 ° C., and ultrasonic waves with an output of 40 kHz and 300 W were used as physical force. In the rinsing step, ion-exchanged water having an electric conductivity of 0.5 μs / cm was used as rinsing water while being stored. The rinse water was heated to 80 ° C. The same ultrasonic wave was used for the rinse water as a physical force in the washing process. Hot air of 120 ° C was used in the drying step. The time required for each step is 3 minutes for the cleaning step and the rinsing step, and 10 minutes for the drying step.

As a result of washing, the water-soluble cutting oil and the grinding sand are reduced to 20
It was confirmed that all of them were cleaned without any residue, and that cleaning of particles such as cutting sand accompanying the processing was also good.

Further, using the cleaning composition of the present embodiment, a circular plate-shaped molded product of polypropylene resin was cleaned. On the surface of this molded product, a release agent and hand grease for handling are attached. The cleaning method was carried out by rubbing the surface of the molded product with a sponge impregnated with the above-described cleaning composition, and then throwing the molded product into a running tap water bath at room temperature. When this tank is full, remove the molded product from the tank and
Was dried with warm air for 15 minutes. It was confirmed that by this cleaning, the surface of the molded product could be cleaned without any release residue of the mold release agent or hand grease.

(Embodiments 4 to 10) Table 3 shows the cleaning compositions of Embodiments 4 to 10. The numbers in the table are v for each composition
ol% is shown. The same cleaning method as in Embodiment 1 was used, and a slide glass was used as the object to be cleaned. As the target stains, three kinds of hand grease, an abrasive, and a water-soluble cutting oil were used, and these were adhered and then heated at 80 ° C. for 1 hour. As a water-soluble cutting oil, trade name "Daphne Aqua Cool" (made by Idemitsu Kosan Co., Ltd.)
The product diluted with 0% was used as an abrasive material under the trade name of "morundum" (manufactured by Showa Denko KK). In Table 3, butyl carbitol is diethylene glycol butyl ether and DPGM is dipropylene glycol methyl ether.

The hand oil was evaluated for breathing under a fluorescent lamp, the abrasive was visually evaluated under a projector lamp, and the water-soluble cutting oil was visually evaluated under a fluorescent lamp. The number of washings was 20 for each stain of each embodiment. The evaluation in Table 3 is that the product that could be washed 20 out of 20 was ◯,
△ that can wash 18 or more out of 20 and × if less
It is described in. From the table, it was confirmed that Embodiments 4 to 10 are superior to Comparative Examples 3 and 4 in the cleaning property of hand grease and abrasives.

[0037]

[Table 3]

[0038]

[Effects of the Invention] For industrial cleaning of metal processed parts, resin molded parts, glass molded parts, ceramic processed parts, etc.
By using the cleaning composition of the present invention and the cleaning method of the present invention, particle stains and hand grease can be cleaned without residue. In addition, the cleaning method of the present invention improves the rinsing property and enables clean cleaning without residues.

[Brief description of drawings]

FIG. 1 is a flowchart showing a cleaning method of the present invention.

Claims (4)

[Claims] 1. Guanidine carbonate 0.01 to 10 vol%
And a water-soluble solvent of 40 to 60 vol% and the balance being water. 2. The cleaning composition, wherein the water-soluble solvent is at least one of alcohols, ketones, lactic acid esters, glycols and glycol ethers which are completely compatible with water. 3. A cleaning step of cleaning an object to be cleaned with the cleaning composition according to claim 1, a rinsing step of rinsing the cleaned object with water, and an object after rinsing with water. A cleaning method comprising a drying step of heating a cleaned product to 80 ° C. or higher to dry it. 4. The cleaning method according to claim 3, wherein the rinsing step is rinsing with warm water of 80 ° C. or higher.