JPH06258607A - Dissolving and washing liquid for pitch, pine resin and the like - Google Patents

Abstract

PURPOSE:To provide the dissolving and washing liquid which has the dissolving and washing power equiv. to the dissolving and washing power of trichloroethylene and is safely usable by containing an aromatic hydrocarbon, etc. CONSTITUTION:This washing and dissolving liquid contains one or two kinds of the aromatic hydrocarbon, cycloparaffinic hydrocarbon or paraffinic hydrocarbon. The aromatic hydrocarbon is the compds. derived from petroleum in which alkyl groups are bonded to benzene rings. These compds. fall under the three major categories expressed by formula I, formula II, formula III corresponding to the number of alkyl group bonded thereto. In the formula I, the formula II, the formula III, R1, R2, R3 are all CnH2n+1; n in the formula I is 1 to 30; n in the formula II is 10<=n<=30, n in the formula III is 10<=n<=30. R1=R2, R1=R2=R3 or R1not equal to R2, R1not equal to R2not equal to R5 in the formula II and the formula III where >=2 alkyl groups are bonded. The carbon atoms n of the alkyl groups are properly selected according to the objects to be dissolved and washed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to pitch, paraffin,
Dissolving and cleaning solution for pitch, pine tar, etc. that dissolves and removes pine tar, grease, wax, etc.

[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 adhesives and oils adhere during the manufacture and processing of various products, it is necessary to remove them, and they are used as a dissolving and cleaning solution for these.

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 aromatic hydrocarbons, cycloparaffinic hydrocarbons or paraffinic hydrocarbons as an active ingredient. And Further, the present invention is characterized in that at least two kinds of aromatic hydrocarbons, cycloparaffinic hydrocarbons and paraffinic hydrocarbons 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 addition, other solvents can be mixed in the mixture.

Aromatic hydrocarbons are petroleum-derived compounds in which an alkyl group is bonded to a benzene ring, and are represented by Chemical formula 1, Chemical formula 2, and Chemical formula 3 depending on the number of alkyl groups bonded.
It is roughly divided into species. In Chemical formula 1, Chemical formula 2, and Chemical formula 3, R ₁ , R
₂ and R ₃ are both C _n H _{2n + 1} , and n in the chemical _{formula 1}
Is 1 to 30, n in Chemical formula 2 is 10 ≦ n ≦ 30, and n in Chemical formula 3 is 10 ≦ n ≦ 30. In Chemical formula 2 and Chemical formula 3 in which two or more alkyl groups are bonded, R ₁ = R ₂ , R ₁ = R ₂
= R ₃ , or R ₁ ≠ R ₂ and R ₁ ≠ R ₂ ≠ R ₃ . The carbon number n of the alkyl group is appropriately selected according to the object to be dissolved and washed.

[0009]

[Chemical 1]

[0010]

[Chemical 2]

[0011]

[Chemical 3]

Cycloparaffinic hydrocarbons are also petroleum-derived compounds and are roughly classified into three types shown in Chemical formula 4, Chemical formula 5, and Chemical formula 6 according to the number of alkyl group bonds. In Chemical Formula 4, Chemical Formula 5, and Chemical Formula 6, R ₁ , R ₂ , and R ₃ are all C _n H _{2n + 1} , n in Chemical Formula 4 is 1 to 30, and n in Chemical Formula 5 and Chemical Formula 6 is 10 ≦ n. ≦ 30. Further, in Chemical formulas 5 and 6, R ₁ = R ₂ , R ₁ = R ₂ = R ₃ or R ₁
≠ R ₂ , R ₁ ≠ R ₂ ≠ R ₃ . Also in this cycloparaffin hydrocarbon, the alkyl group and the carbon number n are appropriately selected according to the object to be dissolved and washed.

[0013]

[Chemical 4]

[0014]

[Chemical 5]

[0015]

[Chemical 6]

Paraffinic hydrocarbons have the chemical formula C _n H _{2n + 2}
And petroleum-derived compounds with 10 ≦ n ≦ 17 are used. 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. On the other hand, the above-mentioned hydrocarbon compound has a good balance of polarities, which allows the pitch to be dissolved as strongly as or more strongly than the chlorine-based solvent. This action is also effective for other oil agents such as paraffin, pine resin, grease, wax, etc., and these can be sufficiently dissolved.

[0017]

[Embodiment] All of the petroleum-derived aromatic hydrocarbons, cycloparaffinic hydrocarbons, and paraffinic hydrocarbons were prepared as dissolution cleaning liquids, and pitch, pine resin, paraffin, and wax were prepared as dissolution cleaning objects. The dissolution test was conducted in the following procedure. In this case, the aromatic hydrocarbon has 14 carbon atoms and an average molecular weight of 15
6. Each compound having a carbon number of 15 and an average molecular weight of 174 as a paraffinic hydrocarbon and having a carbon number of 12 and an average molecular weight of 130 as a cycloparaffinic hydrocarbon was used as a dissolution cleaning liquid.

First, the K-class No. 2 and No. 3 pitches 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. The test tube 7 is filled with the dissolution cleaning liquid 2 and immersed in the water tank 4 of the 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, the characteristic curve A being the above-mentioned paraffinic hydrocarbon, and the characteristic curve B being the above-mentioned. Aromatic hydrocarbons,
Characteristic curve C is the same as [aromatic hydrocarbon: cycloparaffinic hydrocarbon described above] = 50: 50, and characteristic curve D is the case where n-tetradecane is used as paraffinic hydrocarbon, characteristic curve E is Each of trichlene as a comparative example is shown. From the figure, the aromatic hydrocarbon (B) has the same dissolving power as trichlene, and the mixed liquid (C) of the aromatic hydrocarbon and the cycloparaffinic hydrocarbon and the paraffinic hydrocarbons (A and D) are It has the following dissolving power and shows that they can be completely dissolved in a short time. Although the data using the cycloparaffinic hydrocarbon as a simple substance is not described, as can be seen from the characteristic curve C showing the dissolving power of the mixed solution, the cycloparaffinic hydrocarbon alone has a sufficient dissolving power. Is.

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.

Even in this dissolution test, the dissolution test of the cycloparaffinic hydrocarbon alone was not conducted, but aromatic hydrocarbon: cycloparaffinic hydrocarbon = 4
Since the 9:51 mixed solution dissolves all of pine resin, paraffin, and beeswax, cycloparaffinic hydrocarbon alone has a sufficient dissolving power.

In addition to these, in the present invention, it has been found that even if aromatic hydrocarbons, paraffin hydrocarbons and cycloparaffin hydrocarbons are mixed, the above-mentioned object to be dissolved and cleaned can be similarly strongly dissolved. is doing. In the case of these mixed liquids, the compound to be mixed and the mixing ratio thereof can be appropriately selected according to the object to be dissolved and washed.

[0024]

[Table 1]

[0025]

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 (5)

[Claims] 1. A solution for cleaning pitch, pine resin, etc., characterized by containing an aromatic hydrocarbon. 2. A solution for cleaning pitch, pine resin, etc., which contains cycloparaffinic hydrocarbon. 3. A dissolution cleaning solution for pitch, pine resin, etc., characterized by containing paraffinic hydrocarbons. 4. A dissolution cleaning solution for pitch, pine resin, etc., characterized by mixing at least two kinds of aromatic hydrocarbons, cycloparaffinic hydrocarbons, and paraffinic hydrocarbons. 5. A pitch characterized by mixing a solution with at least one of aromatic hydrocarbons, cycloparaffinic hydrocarbons, and paraffinic hydrocarbons,
A solution for dissolving and cleaning pine resin.