JPH06240295A - Dissolving and cleansing fluid for pitch, colophonium or the like - Google Patents

Abstract

PURPOSE:To obtain a dissolving and cleaning fluid for pitch, colophonium, etc., as a substitute for a chlorine-containing solvent by forming a mixture of at least one member selected from among phenetole, anethole and isoamyl butyrate. CONSTITUTION:A dissolving and cleansing fluid such as an aromatic ether such as phenetole of formula I, an anis oil such as anethole of formula II or a paraffinic carboxylic acid such as isoamyl butyrate of the formula: C5H11 COOC3H7 is used as a solvent for an oil such as paraffin, grease, wax, colophonium or pitch. When at least one of these solvents is placed in a vessel, and a substance to be dissolved and cleansed such as pitch is added in this vessel under applied ultrasonic vibrations, the substance can be perfectly dissolved within a specified time. Thus, this solvent can exhibit a solvency comparable to that of a chlorinated solvent such as trichlene and therefore can satisfactorily substitute for it.

Description

Detailed Description of the Invention

[0001]

The present invention relates to pitch, paraffin,
The present invention relates to a solution for cleaning and dissolving pitch, pine resin, etc., which dissolves and removes pine resin, grease, wax, and the like.

[0002]

2. Description of the Related Art In the processing of optical elements such as lenses, prisms and mirrors, the optical elements are set on a jig, but pitch, paraffin and pine resin are used for temporary fixing to the jig. Etc. adhesives are used. Further, it is also possible to process the optical element with high precision by using a pitch in the polishing plate of the optical element. On the other hand, cutting oil is used for cutting metal objects and plastics, and oil agents such as grease and wax adhere to them in the production thereof. As described above, since the adhesive adheres during the manufacture and processing of various products, it is necessary to remove the adhesive after these treatments, and a solution for cleaning and dissolving the adhesive has been conventionally used.

Although trichlene has been used as such a dissolution cleaning liquid, it has a strong toxicity because it is a chlorine-based solvent, and there is a problem that it must be handled with care for health and environmental pollution. For this reason, it is necessary to use a trichlene substitute, and Japanese Patent Publication No. 51-29195 discloses a method of removing a pitch-like polymerized substance using N-methylpyrrolidone.

[0004]

However, when the present inventors tried to dissolve pitch using N-methylpyrrolidone, it was difficult to dissolve 100%. That is, when 2.1 g of pitch dumpling was put into 100 ml of N-methylpyrrolidone and dissolved while applying ultrasonic vibration of 28 KHz and 1.2 KW, dissolution was only about 50% even after 15 minutes, After that, even if the treatment was continued, the pitch dumpling only swelled. On the other hand, when the same treatment was performed using 100 ml of trichlene, 100% of the pitch dumplings were dissolved after about 2.5 minutes. From the above, it was found that N-methylpyrrolidone has a certain degree of dissolving power, but cannot further increase the dissolving power.

Further, N-methylpyrrolidone has a strong attack property on a plastic material, and is not suitable for cleaning parts made of plastic. Moreover, N-methylpyrrolidone has high hydrophilicity,
Not only does it deteriorate over time due to water absorption and the detergency decreases, but it also has the problem of giving off a bad odor.

The present invention has been made in consideration of the above circumstances, and has a larger dissolving power than N-methylpyrrolidone,
An object of the present invention is to provide a solution for cleaning and dissolving an adhesive, which has a solution cleaning power comparable to that of trichlene, has no attack on an object to be cleaned, and can be safely used.

[0007]

Means and Actions for Solving the Problems The dissolution cleaning solution of the present invention is characterized by containing any one of phenetole, anethole and isoamyl butyrate as an active ingredient. Further, the present invention is characterized in that at least two kinds of phenetole, anethole and isoamyl butyrate are mixed and used as an active ingredient. In the case of the latter mixture, the compounding is appropriately performed depending on the adhesive to be dissolved and washed. In this case, in the dissolution cleaning solution in which phenetole and anethole are mixed,
Other solvents can also be mixed.

Phenetol is an aromatic ether having the chemical formula shown in Chemical formula 1, and is also known as ethoxybenzene or phenol ethyl ether. This phenetole has a flash point of 63 ° C. and a boiling point of 172 ° C., and is a liquid having a pleasant odor.

[0009]

[Chemical 1]

Anethole is an aromatic component of anise oil having the chemical formula shown in Chemical formula 2, having a flash point of 92 ° C. and a boiling point of 23.
It is an aromatic compound at 2 ° C.

[0011]

[Chemical 2]

Isoamyl butyrate has the chemical formula C ₅ H ₁₁ COOC.
Has ₃ H _7, flash point 65 ° C., boiling point 150 to 180
It is a paraffinic carboxylic acid having a temperature of ° C. On the other hand, the pitch in the adhesive to be cleaned is a residual residue after heavy oil refining, and is not a simple aromatic system or paraffin system but a mixture of various polar monomers, oligomers and polymers. In contrast, phenetole, anethole, and isoamyl butyrate have a good balance of polarities, which allows the pitch to be strongly dissolved. This action is also effective for other oil agents such as paraffin, pine resin, grease, wax, etc., and these can be sufficiently dissolved.

[0013]

[Examples] Phenetol, anethole and isoamyl butyrate were prepared as a dissolution cleaning solution, and pitch, pine resin, paraffin and beeswax were prepared as dissolution cleaning objects, and a dissolution test was conducted in the following procedure.

First, the pitches of K class Nos. 2 and 3 are set to 1:
The mixture was mixed at a ratio of 1 and 2.1 g of a truncated cone-shaped pitch lump was cast to obtain a pitch melting sample. In addition, pine resin, paraffin and beeswax were used as a sample for dissolution in the form of a mass of 0.25 g. These were put into a dissolution tank, and a dissolution test was performed using each dissolution cleaning solution. FIG. 2 shows a dissolution test of 2.1 g of pitch lump, and 100 ml of room temperature dissolution cleaning liquid 2 is placed in the beaker 1.
Then, the beaker 1 is put into the ultrasonic bath 3 and is immersed in the normal temperature water bath 4. Inside the ultrasonic tank 3, an ultrasonic diaphragm 5 having an output of 28 KHz and 1.2 KW is provided. After setting in this way, 2.1 g of pitch lumps 6 are put into the beaker 1 while being subjected to ultrasonic vibration to be melted. For the dissolution, the time required for 100% dissolution was measured while measuring the weight of the residual pitch lumps 6 every 1 minute.

FIG. 3 shows a dissolution test of pine resin, paraffin, and beeswax. A test tube 7 is filled with a dissolution cleaning solution 2 and immersed in a water tank 4 of an ultrasonic tank 3. The water tank 4 is at room temperature, and an ultrasonic vibration plate 5 having an output of 28 KHz and 1.2 KW is provided in the ultrasonic tank 3. Also in this test, 0.25 g of each sample of pine resin 8, paraffin 9, and beeswax 10 was put into each test tube 7 while ultrasonic vibration was applied, and the time until complete dissolution was measured.

FIG. 1 is a characteristic diagram plotting the time until complete dissolution when the pitch mass 6 is dissolved by the operation shown in FIG. 2. Characteristic curve A is phenetole, characteristic curve B is anethole, and characteristic curve C is butyric acid. Each of isoamyl is shown. Characteristic curve D is phenetole: isoamyl butyrate:
Paraffinic petroleum = 2.5: 2.5: 5 mixed solution, and characteristic curve E shows trichlene as a comparative example. From the figure, it can be seen that phenetol and the mixed solution have the same degree of dissolving power as trichlene, followed by anethole and isoamyl butyrate in this order, but both can be completely dissolved in a short time.

Table 1 shows pine resin, paraffin and beeswax.
The results of measuring the time required for complete dissolution by the procedure shown in are shown below. Although the amount of time required varies depending on the type of dissolution cleaning solution, it is possible to completely dissolve them.

[0018]

[Table 1]

[0019]

As described above, the dissolution cleaning solution of the present invention is capable of completely dissolving oil agents such as pitch, pine resin, paraffin, grease, wax, etc., and is therefore useful as a cleaning solution as a substitute for chlorine-based solvents such as trichlene. have.

[Brief description of drawings]

FIG. 1 is a dissolution characteristic diagram of pitch lumps.

FIG. 2 is a cross-sectional view showing a pitch dissolution test.

FIG. 3 is a cross-sectional view showing a dissolution test of pine resin.

Claims (4)

[Claims] 1. A dissolution cleaning solution for pitch, pine resin, etc., which contains phenetole. 2. A solution for cleaning pitch, pine resin, etc., which contains anethole. 3. A dissolution cleaning solution for pitch, pine resin, etc., which contains isoamyl butyrate. 4. A solution for cleaning and dissolving pitch, pine resin, etc., characterized by mixing at least two of phenetole, anethole, and isoamyl butyrate.