JPS5825752B2 - Cleaning agent for cleaning buff dregs and method for cleaning buff dregs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detergent for cleaning puff dregs containing stabilized 1,1.1-1-IJ chlorequene as a main component, and a method for cleaning puff dregs using the same.

Various metal daily necessities, such as cutlery and Western tableware, made of various metal platings, stainless steel, etc.

Eyeglass frames, watch exterior parts, etc. are finished by polishing to a highly glossy surface.

Puff polishing is common for these polishing operations.

Rough polishing, medium polishing, and final polishing are used depending on the purpose.

Traditionally, manual brushing and cleaning agents containing dangerous cyanide have been used to clean the puff scum after polishing these metal parts, and cleaning with organic solvents other than water-based
Cleaning with trichlorethylene is common.

The abrasive used for puff polishing consists of an oil containing mainly paraffin and fatty acids and abrasive grains.

The content of abrasive grains varies depending on rough polishing and final polishing, but is generally 50 to 70%, and silica, alumina, chromium oxide, etc. are used.

During puff polishing, the object to be polished is temporarily heated to several hundred degrees.
The puff agent and the surface of the object to be polished undergo various changes.

If the puff dregs are left for a long period of time, the oil in the puff dregs will solidify and become difficult to clean.

In operations where a single worker has many opportunities to come into contact with a large amount of solvent vapor, such as cleaning puff scum using organic solvents, it is extremely problematic to use highly toxic organic solvents such as trichlorethylene, and It has been desired by the industry to substitute less toxic solvents.

1.1,1-Trichloroethane has relatively low toxicity to humans compared to other chlorinated solvents, and is widely used as a solvent for degreasing metal mechanical parts, dry cleaning, and other industrial solvents. ing.

Attempts have been made to use stabilized 1,1.1 trichloroethane for general metal degreasing as an alternative to trichlorethylene for cleaning puff scum; is, 1, 1
, 1-trichloroethane has insufficient dissolving power, and compared to cleaning with trichlorethylene, the number of defective products that are washed in the actual cleaning process increases significantly.

There have been problems such as the need to remove dirt by wiping hands after washing, or the need to take an extremely long time to wash the puff dregs.

Furthermore, even with trichlorethylene, which has been commonly used in the past, it is difficult to completely clean stubborn stains, and after going through the cleaning process once, it is actually necessary to wash again or perform local correction cleaning.

The present inventors have discovered that stabilization 1゜1.1 contributes to puff scum cleaning.
The present invention provides a relatively low-toxicity cleaning agent and cleaning method that improves the dissolving power of chloroethane and can easily clean even extremely tough puff dregs.

That is, 5 the present invention provides a cleaning agent for cleaning puff dregs, which is prepared by adding and mixing acetone or methyl ethyl ketone to a stabilized 1,1.1-1-IJ chloroethane composition, and using the cleaning agent, the cleaning agent is heated using an ultrasonic vibrator. A puff dregs cleaning method characterized by performing ultrasonic cleaning.

In the present invention, stabilized 1,1,1-to-IJ chloroethane is a mixture of 1,1,1-1-lichloroethane with a conventionally known stabilizer of about 10% to 10%, and even after long-term use, it becomes extremely unstable. Any 1,1,1-trichloroethane may be used as long as it does not cause serious deterioration of the solvent and does not cause corrosion of the items to be washed or the cleaning equipment.

As the stabilizer, cyclic ethers, epoxides, nitroalkanes, alcohols having about 3 to 5 carbon atoms, and the like are generally used alone or in combination.

The cleaning agent of the present invention is achieved by adding acetone or methyl ethyl ketone to the above stabilized 1,1,1-trichloroethane.

The amount of acetone or methyl ethyl ketone added is preferably 1 to 10% by weight based on the total cleaning agent. Less than 1% is less effective, and more than 10% may have a flash point and may be harmful to metals. This is not preferable because it acts in a direction that impairs the stability of the material.

Acetone or methyl ethyl ketone is 1,1.1
Although it has no effect of increasing the stability of trichloroethane toward metals, and rather acts in the direction of slightly degrading it, 10% by weight
There is practically no problem if the following additions are made.

That is, the addition of acetone or methyl ethyl ketone in the cleaning agent of the present invention is completely different from a so-called stabilizer, and these additives are added only for the purpose of increasing the cleaning ability of puff dregs. .

Puff dregs can be cleaned using the cleaning agent of the present invention by ordinary hot bath or boiling cleaning, but it is more effective to use ultrasonic cleaning using an ultrasonic vibrator in combination.

Generally, it is known that the ability of a solvent to clean dirt increases by increasing the solvent temperature or using an ultrasonic transducer.5According to the study conducted by the present inventors, The degree of rotation varies greatly depending on the type of solvent.

Conventionally known trichlorethylene or stabilized 1,
1.1-1-IJ One of the major features of the present invention is that compared to chloroethane, the cleaning agent of the present invention can dramatically improve the ability to clean puff dregs by using an ultrasonic vibrator in combination. be.

As an example of a suitable cleaning device for use in the practice of the present invention, a three-tank cleaning device is shown in FIG.

1 is a first cleaning tank, 2 is a second cleaning tank, 3 is a third cleaning tank, 4 is a cooling pipe for condensing solvent vapor, 5 is a water separator,
6 is an ultrasonic oscillator, and 7 is a heater for heating.

Furthermore, the arrows in the figure indicate the circulation path of the solvent.

In the present invention, items to be washed that have puff dregs attached to them.

After being roughly cleaned in a cleaning tank equipped with an ultrasonic oscillator, it is cooled to near room temperature in a second tank, and then finished cleaned with solvent vapor in a third tank.

Here, the ability to clean tough dirt is almost determined by the first tank, and it is extremely effective to use an ultrasonic oscillator in this tank.

The frequency of ultrasonic waves used is 20 to 100 kHz/second, and relatively high-frequency ultrasonic waves are used to clean objects with fine expressions, while low-frequency ultrasonic waves are used to wash objects with flat surfaces. Ultrasound is suitable.

In general, the closer the temperature of the solvent is to its boiling point, the better its cleaning power is, and it is desirable to heat the solvent with an electric heater or the like in addition to heat generation using ultrasonic waves.

Although the cleaning agent and cleaning method of the present invention have a particularly remarkable effect on cleaning puff scum, they can be applied to other cleaning fields in which stabilized 1,1.1-)IJ chloroethane has conventionally been generally used. There is no problem in applying it to

The present invention will be further explained below with reference to Examples.

In the following examples, cleaning experiments were carried out using polished articles of the same shape and under the same conditions. 50 pieces of each were cleaned, and after cleaning, they were inspected in detail under a magnifying glass, and no residual polishing powder was found. The number of passing items is 150 x 100 (OA
was taken as the passing rate.

In addition, the cleaning agent composition is represented by the following symbols.

Example 1 Using the side of a stainless steel men's watch with a polished front frame as the object to be washed, and using the cleaning device shown in FIG. Washed with.

A 40 kHz/second ultrasonic oscillator was used in the first tank, and the cleaning agent was heated to 70°C.

The second tank was a cold bath, and the third tank was a steam bath, and the items to be washed were washed sequentially from the first tank for 1 minute each.

The results are shown in Table 1.

Note that after washing, no discoloration or stains were observed on the items to be washed.

Example 2 The side of a men's watch made of zinc and polished with a front frame was used as the object to be washed, and the cleaning equipment shown in FIG.
and a cleaning agent shown in Comparative Example.

The cleaning conditions were the same as in Example 1 except that the ultrasonic oscillator in the first tank was set to 28 kHz/second.

The results are shown in Table 2.

In this experiment, no discoloration or stains were observed on the items to be washed after washing.

Example 3 A brass women's watch back cover polished with a front frame was cleaned using the cleaning agent shown in Table 3 g and Comparative Example (5) as the cleaning agent composition.

The cleaning device used was one with the same structure as in Figure 1, and the frequency was 40kHz.
The cleaning performance was compared by changing the temperature of the first bath between the case where ultrasonic waves of /second were used in combination and the case where no ultrasonic waves were used at all.

The results are shown in Figure 2.

From this result, the cleaning agent of the present invention can be used for simple immersion cleaning.
It exhibits superior cleaning properties compared to conventionally known stabilized 1,1,1-trichloroethane.

It is clear that the performance can be dramatically improved by using ultrasound in combination.

Note that the cleaning agent of the present invention is free from the risk of causing troubles such as discoloration and staining even when the brass parts are relatively prone to troubles such as discoloration and stains.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an apparatus showing one example of implementation of the present invention, and FIG.
The figure is a graph showing the results of Example 3 and Comparative Example 5. In the figure, ○ indicates Example 3 in which ultrasound was used; . indicates that ultrasound was not used;
△ indicates Comparative Example 5 in which ultrasonic waves were used together, and M indicates that the same ultrasonic waves were not used.

Claims (1)

[Claims] 1. Stabilization1. A detergent for cleaning slag made by adding and mixing acetone or methyl ethyl ketone to Ll-IJ chloroethane compound. 2. The detergent for cleaning puff scum according to claim 1, wherein the amount of acetone or methyl ethyl ketone added is 1 to 10% by weight based on the total solvent. 3. Stabilized 1,1,1-to-IJ chloroethane composition,
A puff dregs cleaning method characterized by using a puff dregs cleaning agent made by adding and mixing acetone or methyl ethyl ketone and performing ultrasonic cleaning with a smoke sound wave vibrator.