JP2576941B2 - Cleaning solvent composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning solvent composition used as a substitute for chlorofluorocarbons and chlorine solvents.

[0002]

2. Description of the Related Art Freon and chlorine-based solvents have been widely used so far, and various techniques for stabilizing and using fluorocarbon and chlorine-based solvents have been developed. For example, as a stabilization technique, JP-A-3-173835 discloses an azeotropic mixture containing trichlorodifluoroethane and a hydrocarbon, an alcohol, a ketone, an ether, an ester, or the like, a nitro compound, a phenol, an amine, an ether, There is disclosed a technique of adding a stabilizer selected from the group consisting of amylenes, esters, organic phosphites, epoxides, furans, alcohols, ketones, and triazoles. However, the use of chlorofluorocarbon and chlorinated solvents has been restricted due to environmental problems in recent years, and it has been desired to establish an excellent washing solvent instead of these and a stabilization technique thereof. On the other hand, brominated hydrocarbons are inferior in chemical stability and nonflammability to flon and chlorinated hydrocarbons, and have not been used as solvents for degreasing and cleaning various metal parts and plastics.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel cleaning solvent composition having an excellent cleaning effect as a substitute for chlorofluorocarbons and chlorine solvents.

[0004]

As a result of various studies on brominated hydrocarbons, the present inventors have found that n-propyl bromide and isobromide are flame-retardant and have a very low solubility in various oils. And excellent degreasing properties. In addition, these solvents alone have the drawback that the reactivity with metals, particularly aluminum or its alloys, is very large, and this reaction occurs even at room temperature, but becomes remarkable especially when the temperature is raised for steam cleaning. Within a short time of 10 to 20 minutes, they reacted with aluminum to form a black-brown tar or carbide, and also found that aluminum was severely corroded and completely dissolved. However, as a result of various studies on a stabilizer which can be stably operated for a long period even after steam cleaning, it was found that the reactivity with a metal can be greatly improved by adding a specific stabilizer. The present invention has been made based on such findings. That is, the present invention relates to (A) n-propyl bromide and / or isopropyl bromide, (B) at least one compound selected from the group consisting of nitromethane, nitroethane and nitropropane, and (C) alkyl cellosolve and dioxane. A cleaning solvent composition comprising at least one compound selected from the group consisting of:

The alkyl cellosolve of the component (C) used in the present invention has an alkyl group having 1 to 1 carbon atoms.
0, preferably 1 to 3 alkyl cellosolves. Specific examples include methyl cellosolve, ethyl cellosolve, and isopropyl cellosolve, which can be used alone or as a mixture of two or more.
Examples of the dioxane of the component (C) include 1,4-dioxane. Component (B) and component (C) can be used in any ratio with respect to component (A),
0.5 to 15% by weight of component (B) in component (A)
%), Preferably 1 to 5%. In addition, 0.01 to 10% of component (C) in component (A),
Preferably, 0.05 to 3% is present. In the present invention, the pH of the cleaning solvent composition is preferably adjusted to 6 to 8 using an amine.

The amines used herein include hexylamine, octylamine, 2-ethylhexylamine, dodecylamine, ethylbutylamine, hexylmethylamine, butyloctylamine, dibutylamine,
Octadecylmethylamine, triethylamine, tributylamine, diethyloctylamine, tetradecyldimethylamine, diisobutylamine, diisopropylamine, pentylamine, N-methylmorpholine, isopropylamine, cyclohexylamine, butylamine,
Isobutylamine, dipropylamine, 2,2,2,6
One or two of tetramethylpiperidine, N, N-diallyl-P-phenylenediamine, diallylamine, aniline, ethylenediamine, propylenediamine, diethylenetriamine, tetraethylenepentamine, benzylamine, dibenzylamine, diphenylamine, diethylhydroxyamine, etc. A mixture of the above is given.
The pH may be adjusted to 6 to 8 using sodium hydroxide or sodium carbonate. In the present invention, in addition to the above-mentioned stabilizer, phenol used as a chlorine-based hydrocarbon stabilizer, phenols such as O-cresol, monoethanolamine, diethanolamine, amino alcohols such as triethanolamine, methylbutynol, Acetylene alcohols such as methylpentinol and propargyl alcohol, and triazoles such as benzotriazole, (2-hydroxyphenyl) benzotriazole, and chlorobenzotriazole can also be used as the auxiliary stabilizer.

[0007]

The cleaning solvent composition of the present invention has excellent degreasing and cleaning properties, and can be used as an alternative solution for chlorofluorocarbons and chlorine solvents. Particularly, by using the component (B) and the component (C) together, it is possible to stably and satisfactorily perform degreasing and cleaning for a long period of time without corroding the metal to be cleaned. Therefore, it can be very suitably used for cleaning various metal products and electronic parts. Next, the present invention will be specifically described with reference to Examples and Comparative Examples.

[0008]

【Example】

Example 1 The action on aluminum pieces when nitroethane and methyl cellosolve were changed to n-propyl bromide at the ratios shown in Table 1 was evaluated by the following method. In addition, n-
The pH of the cleaning solvent composition containing propyl bromide, nitroethane and methyl cellosolve was adjusted to 7.5 using diisopropylamine in advance. Evaluation method (1) A cleaning solvent composition was prepared, and an aluminum piece (JIS-H4000, A110) was applied to each of the liquid phase portion and the gas phase portion of the cleaning solvent composition according to the method described in JIS-K1600.
0P) was placed, and the corrosion state of the metal piece after 48 hours was observed and evaluated according to the following criteria. Corrosion status evaluation standard ○ No change × Corrosion evaluation method (2) Prepare a solvent composition for washing, put it in a flask equipped with a reflux condenser, reflux for 2 hours in a warm bath at 70-80 ° C, and remove aluminum in the liquid. The state of corrosion of the aluminum surface damaged and damaged by sharp stainless steel was observed and evaluated according to the following criteria. Corrosion status evaluation criteria ○ No change × Corrosion

[0009]

[Table 1] Table-1 Nitroethane methyl cellosolve Evaluation method (1) Evaluation method (2) 0.5% − ○ × 3% − ○ × − 3% × × − 4% × × 0.5% 2% ○ ○ 2% 1% ○ ○

Example 2 The action on aluminum pieces when nitromethane and methyl cellosolve were changed to isopropyl isobromide at the ratios shown in Table 2 was evaluated in the same manner as in Example 1. The pH of the cleaning solvent composition containing propyl isobromide, nitromethane and methyl cellosolve was previously adjusted to 6.5 using diisopropylamine.

[Table 2] Table-2 Nitromethane Methyl cellosolve Evaluation method (1) Evaluation method (2) 1%-○ ×-3% × × 0.5% 2% ○ ○ 2% 1% ○ ○

Example 3 The effect on aluminum strips when nitroethane and 1,4-dioxane were changed to n-propyl bromide at the ratios shown in Table 3 was evaluated in the same manner as in Example 1. The pH of the cleaning solvent composition containing propyl isobromide, nitroethane and 1,4-dioxane was previously adjusted to 6.5 using diisopropylamine.

[Table 3] Table-3 Nitroethane 1,4-dioxane Evaluation method (1) Evaluation method (2) 1%----3%-- 2% 1% --

────────────────────────────────────────────────── (5) Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location C11D 7:26) (56) References JP-A-2-185597 (JP, A) JP-A-2 −204449 (JP, A)

Claims (2)

(57) [Claims] 1. A method comprising: (A) n-propyl bromide and / or isopropyl bromide; (B) at least one compound selected from the group consisting of nitromethane, nitroethane and nitropropane; and (C) alkyl cellosolve and dioxane. Contains at least one compound selected from the group consisting of
And a solvent composition for cleaning comprising no fluorine-based solvent and no chlorine-based solvent . 2. The cleaning solvent composition according to claim 1, wherein the pH is in the range of 6 to 8.