KR970002040B1 - Deterging solvent composition and a method for washing an article with the same - Google Patents

Abstract

None.

Description

[Name of invention]

Solvent Composition for Cleaning and Cleaning Method of Articles

Detailed description of the invention

[Background of invention]

The present invention relates to a cleaning solvent composition used as a substitute for a chlorofluorocarbon (hereinafter referred to as a flon) solvent and a chlorine solvent and a method for cleaning the article therewith.

Flon and chlorine solvents have been widely used until now.

Various techniques have been developed to stabilize and utilize flon and chlorine solvents.

For example, Japanese Patent Application Publication No. Hei 3-173835 is a stabilizer selected from the group consisting of nitro compounds, phenols, amines, ethers, amylenes, esters, organic phosphites, epoxides, furans, alcohols, ketones and triazoles, trichlorodifluoroethanes and hydrocarbons, alcohols Disclosed is a stabilization method that is added to an azeotrope comprising a ketone, ether, ester, and the like.

However, the use of flon and chlorine solvents is limited in recent years because they cause environmental problems. Under such circumstances, there has been a strong demand for the development of an excellent cleaning solvent that can be used instead of the solvent described above and a technique for stabilizing it.

On the other hand, brominated hydrocarbons have not been used as solvents for degreasing and cleaning metal parts and plastics because they have lower chemical stability and incombustibility than flan and chlorinated hydrocarbons.

[Overview of invention]

Therefore, it is an object of the present invention to provide a new cleaning solvent composition which has an excellent cleaning effect and is useful as a flon and chlorine solvent substitute.

It is another object of the present invention to provide a cleaning solvent composition having high stability.

Another object of the present invention is to provide a method of washing an article with the solvent composition described above.

These and other objects of the present invention will become apparent from the following description and examples.

After intensive research on brominated hydrocarbons, the inventors found that certain brominated hydrocarbons are flame resistant and have high oil solubility and good degreasing and cleaning properties.

However, the inventors have also found their drawback that the reactivity of metals, especially aluminum and alloys thereof and their solvents is very high.

The problem is that the reaction takes place even at ambient temperature, especially when the temperature is raised for cleaning with steam. That is, the solvent reacts with aluminum in a short time of 10 to 20 minutes to form a dark brown tar or carbide, and also aluminum is severely corroded to finally completely dissolve aluminum.

After research suitable for the purpose of finding a stabilizer that can be used stably for steam cleaning for a long time, the inventors have found that the reactivity of the cleaning agent with the metal can be significantly reduced by adding certain stabilizers.

The present invention has been completed based on this finding.

In a first aspect of the invention it is a brominated hydrocarbon of the formula (A): C _n H _{2n + 1} Br where n represents a number of 3 or more and / or the formula: C _m H _2m-1 Br where m Provides a cleaning solvent consisting essentially of a brominated hydrocarbon of 2 or more).

In a second aspect of the present invention, there is provided a stable cleaning solvent composition comprising a solvent (A) described above and a stabilizer selected from the group consisting of nitroalkanes, ethers, epoxides and amines.

In a third aspect of the present invention, there is provided a stable cleaning solvent composition composed of a solvent selected from the group consisting of the solvents (A), (B) nitroalkanes, ethers, epoxides, and (C) amines described above.

In a fourth aspect of the invention, there is provided a method of cleaning an article with the aforementioned solvent or solvent composition.

[Detailed Description of Preferred Embodiments]

Examples of brominated hydrocarbons represented by the formula: C _n H _{2n + 1} Br or C _m H _2m-1 Br include n-propyl bromide, iso-propyl bromide, n-butyl bromide, isobutyl bromide, sec-butyl bromide, n-amyl bromide, isoamyl bromide, n-hexyl bromide, n-heptyl bromide, n-octyl bromide, 2-ethylhexyl bromide, n-nonyl bromide, n-decyl bromide, allyl bromide, butylene Bromide and hexylene bromide. They may be used alone or in the form of a mixture of two or more thereof.

In the formulas, n represents a number of 3 or more, preferably 3 to 8, more preferably 3 to 6, while m in the formula is 2 or more, preferably 2 to 9, More preferably, 3 to 7 are displayed.

Of these, n-propyl bromide and iso-propyl bromide are most preferred.

Nitroalkanes that may be used in the present invention include niromethane, nitroethane, 1-nitropropane, 2-nitropropane and nitrobenzene.

They may be used alone or in the form of a mixture of two or more thereof.

Ethers include 1,2-dimethoxyethane, 1,4-dioxane, diethyl ether, diisopropyl ether, dibutyl ether, trioxane, alkyl cellosolves, the alkyl group being methyl cellosolve, ethyl cellosolve and It has 1 to 10 carbon atoms such as isopropyl cellosolve, acetal, acetone, dimethylacetal, γ-butyrolactone, methyl t-butyl ether, tetrahydrofuran and N-methylpyrrole.

They may be used alone or in the form of a mixture of two or more thereof.

Epoxides include epichlorohydrin, propylene oxide, butylene oxide, cyclohexene oxide, glycidyl methyl ether, glycidyl methacrylate, pentene oxide, cyclopentene oxide and cyclohexene oxide.

They may be used alone or in the form of a mixture of two or more thereof.

Hexylamine, octylamine, 2-ethylhexylamine, dodecylamine, ethylbutylamine, hexylmethylamine, butyloctylamine, dibutylamine, octadecylmethylamine, triethylamine, tributylamine, diethyloctyl to amine Amine, tetradecyldimethylamine, diisobutylamine, diisopropylamine, pentylamine, N-methylmorpholine, isopropylamine, cyclohexylamine, butylamine, isobutylamine, dipropylamine, 2,2,6 , 6-tetramethylpiperidine, N, N-diallyl-p-phenylenediamine, diallylamine, aniline, ethylenediamine, propyldiamine, diethylenetriamine, tetraethylenepentamine, benzylamine, dibenzylamine , Diphenylamine and diethylhydroxyamine.

These are useful alone or in the form of mixtures of two or more thereof.

The amount or relative amount of stabilizer required for stabilization of the brominated hydrocarbon described above depends on the type of oil adhering to the material to be cleaned and also varies over a wide range depending on the cleaning conditions such as the cleaning method.

It is preferably in the range of 0.1 to 15% by weight, more preferably in the range of 0.5 to 10% by weight, based on the total amount of brominated hydrocarbon. When this is less than 0.1%, the stabilizing effect is insufficient, whereas an amount exceeding 15% is economically disadvantageous.

Although the stabilizer is used alone, its effect is shown, but a combination of two or more stabilizers is also useful.

In the latter case, the total amount of stabilizer is preferably in the range of 0.1 to 15%.

The composition preferably also contains at least one compound (B) selected from the group consisting of nitromethane, nitroethane and nitropropane and at least one compound (C) selected from the group consisting of alkyl cellosolves and dioxane. In this connection n-propyl bromide and iso-propyl bromide are preferred as solvent (A).

Alkyl cellosolves (C) are those in which the alkyl group has 1 to 10 carbon atoms, preferably 1 to 3 carbon atoms, such as methyl cellosolve, ethyl cellosolve and isopropyl cellosolve.

These are useful alone or in the form of mixtures of two or more thereof.

The amount of components (B) and (C) relative to the amount of component (A) is not particularly limited, but component (A) contains 0.5 to 15%, especially 1 to 5% of component (B), It is preferred that A) contains 0.01 to 10%, in particular 0.05 to 3%, of component (C).

The pH of the cleaning solvent composition is preferably adjusted to 6 to 8 with amine.

The cleaning solvent compositions of the present invention include, in addition to the stabilizers described above, phenols such as phenol and o-cresol; Aminoalcohols such as monoethanolamine, diethanolamine and triethanolamine; Acetylene alcohols such as methylbutynol, methylpentylol and propargyl alcohol; And auxiliary stabilizers selected from the group consisting of triazoles such as those commonly used as stabilizers for chlorinated hydrocarbons such as benzotriazole, (2-hydroxyphenyl) benzotriazole and chlorobenzotriazole. have.

The cleaning solvent and the cleaning composition of the present invention containing component (A) have excellent degreasing and cleaning properties and are useful as flolon and chlorine solvent substitutes. By incorporating certain stabilizers into this composition, metals can be effectively and reliably degreased and cleaned for a long time without corrosion. In particular, by incorporating components (B) and (C) into the composition, the metal can be effectively and stably degreased and washed with the composition for a long time without corrosion.

Cleaning solvent compositions are very suitable for cleaning processed metal products and electronic components. For example, an article or circuit board made of metal or plastic can be washed with a cleaning solvent or cleaning composition, for example, to remove grease or oil from the article or circuit board. In this regard, the article or circuit board may be immersed in a cleaning solvent or cleaning solvent composition while heating.

The following examples and comparative examples will further illustrate the present invention.

Example 1

The cleaning solvent composition given in Table 1 was prepared.

Aluminum pieces (JIS-H-4000, A1100P) were arranged in the composition of the gas phase and liquid phase, and corrosion of the metal pieces was observed after 48 h according to JIS-K1600.

Results were measured according to the following criteria:

Standard of corrosion:

○: no change

×: corrosion

These results are given in Table 1 together with the results of the comparative examples.

In the table, nPB stands for n-propyl bromide (1-bromo propane), IPB stands for isopropyl bromide (2-bromo propane), and their amounts are given by weight ratio in parentheses.

Degreasing / cleaning force was measured by the method described below:

Degreasing / Cleaning Test:

Apply press oil (brand name: Nippon Kosaku-yu # 640) to pre-washed SPCC mild steel plate (50 × 100 × 0.3mm), and leave it in the room for 3 days. 200 to 300 mg / dm ² ) was obtained.

The test pieces were immersed in the sample solution for 2 minutes at room temperature and then dried.

The amount of oil remaining was measured by gravimetric method.

Degreasing / cleaning power was evaluated as good when the amount of oil remaining was 2 mg / dm ² or less, and this amount 2 mg / dm ² was equal to the amount of trichloroethane.

X: The amount of oil remaining was ² mg / dm ² or more.

○: The amount of oil remaining was 2 mg / dm ² or less.

Note: D.D. Power refers to degreasing / cleaning power (see below).

Example 2

The effect of aluminum flakes was tested by changing the relative amounts of nitroethane and methyl cellosolve added to n-propyl bromide (1-bromo propane) as given in Table 2 by the method described below.

The pH of the cleaning composition consisting of n-propyl bromide (1-bromo propane), nitroethane and methyl cellosolve was previously adjusted to 7.5 with diisopropylamine.

Evaluation method (1):

Corrosion of the metal pieces was observed in the same manner as in Example 1.

Evaluation method (2):

A cleaning formulation was prepared and placed in a flask with a reflux condenser.

After refluxing for 2 h in a hot bath at 70-80 ° C., the aluminum pieces were scraped with a sharp stainless steel knife and the corrosion state of each aluminum piece surface was observed. This result was evaluated according to the following criteria.

○: no change

×: corrosion

Example 3

The effect of the aluminum statue was tested by changing the relative amounts of nitromethane and methyl cellosolve added to isopropyl bromide (2-bromo propane) as given in Table 3 in the same manner as in Example 2.

The pH of the cleaning composition consisting of isopropyl bromide (2-bromo propane), nitromethane and methyl cellosolve was previously adjusted to 6.5 with diisopropylamine.

Example 4

The effect of the aluminum statue was tested by changing the relative amounts of nitroethane and 1,4-dioxane added to n-propyl bromide (1-bromo propane) as given in 4 in the same manner as in Example 2.

The pH of the cleaning solvent composition consisting of n-propyl bromide (1-bromo propane), nitroethane and 1,4-dioxane was previously adjusted to 6.5 with diisopropylamine.

Example 5

The cleaning solvent compositions given in Table 5 were prepared and their corrosion and their degreasing and detergency were tested in the same manner as in Table 1.

The results are given in Table 5.

In the table, n-butyl bromide is 1-bromo butane, isobutyl bromide is 1-bromo-2-methyl propane, n-amyl bromide is 1-bromo pentane and n-hexyl bromide is 1-bro Parent hexane, n-heptyl bromide is 1-bromo heptane and allyl bromide is CH = CHCHBr.

Claims (16)

(A) a brominated hydrocarbon of formula C _n H _{2n + 1} Br, where n represents a number of 3 or more and / or a formula: C _m H _2m-1 Br, wherein m represents a number of 2 or more A washing solvent consisting essentially of a brominated hydrocarbon of The washing solvent according to claim 1, wherein n is 3 to 8 and m is 2 to 9 in formula. The washing solvent according to claim 2, wherein n is 3 to 6 and m is 3 to 7 in the formula. The cleaning solvent according to claim 2, wherein the brominated hydrocarbon is selected from the group consisting of n-propyl bromide and isopropyl bromide. The cleaning solvent according to claim 1, wherein the pH of the solvent is adjusted to 6 to 8 by the addition of an amine. (A) a brominated hydrocarbon of formula C _n H _{2n + 1} Br, where n represents a number of 3 or more and / or a formula: C _m H _2m-1 Br, wherein m represents a number of 2 or more And a stabilizing agent selected from the group consisting of nitroalkanes, ethers, epoxides, and amines. 7. The solvent composition according to claim 6, wherein n is 3 to 8 and m is 2 to 9. 7. A solvent composition according to claim 6, wherein the stabilizer is present in an amount of 0.1 to 15% by weight and the remainder is component (A). The solvent composition according to claim 6, comprising a solvent selected from the group consisting of (B) nitroalkanes, ethers, epoxides, and (C) amines. 7. A solvent composition according to claim 6, wherein components (B) and (C) are present in amounts of 0.5 to 15% by weight and 0.001 to 10% by weight, respectively, with the remainder being component (A). The composition of claim 10 wherein component (A) is selected from the group consisting of n-propyl bromide and iso-propyl bromide. (A) a brominated hydrocarbon of formula C _n H _{2n + 1} Br, where n represents a number of 3 or more and / or a formula: C _m H _2m-1 Br, wherein m represents a number of 2 or more A method of cleaning an article with a cleaning solvent consisting essentially of brominated hydrocarbons. 13. The method of claim 12, wherein n is 3 to 8 and m is 2 to 9 in the formula. (A): brominated hydrocarbon of C _n H _{2n + 1} Br, where n represents 3 or more, and / or the formula: C _m H _2m-1 Br, where m represents 2 or more And a cleaning solvent composition comprising a brominated hydrocarbon of (C) and a stabilizer selected from the group consisting of nitroalkanes, ethers, epoxides and amines. The method according to claim 14, wherein the stabilizer is present in an amount from 0.1 to 15% by weight and the remaining component (A). The method according to claim 14, wherein a solvent selected from the group consisting of (B) nitroalkanes, ethers, epoxides, and (C) amines is contained.