JPH05271693A - Detergent - Google Patents

Abstract

PURPOSE:To provide a detergent excellent in detergency and separability from water and having an ignition point practically high enough by using a specific glycol ether as the effective component. CONSTITUTION:A detergent contains a glycol ether of the formula (wherein R<1> is H, 1-6C alkyl, or cycloalkyl; R2 and R<3> are each II or methyl provided that they are not simultaneously methyl; C6H11 is cyclohexyl and (n) is an integer of 1-3) as the effective component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning solvent suitable for removing processing oils used for processing precision machine parts, optical machine parts, etc. and fluxes used for soldering electric and electronic parts. It is a thing.

[0002]

Various processing oils such as cutting oil, pressing oil, drawing oil, heat treatment oil, rust preventive oil, wax, lubricating oil, grease, etc. are used when processing precision mechanical parts, optical mechanical parts, etc. However, these oils and fats need to be finally removed, and removal with a solvent is generally performed.

Soldering is most commonly used as a method for joining electronic circuits, but the purpose is to remove and clean oxides on the metal surface to be soldered, prevent reoxidation, and improve wettability of solder. Therefore, it is usual to pretreat the soldering surface with a flux containing rosin as a main component.
The soldering method is to supply the flux to the surface of the board by dipping the board in a solution-like flux, and then to supply molten solder, or to mix the flux and solder powder in advance to form a paste. Although there is a method of heating after supplying it to the place to be soldered, in any case, flux residue causes corrosion of the metal, deterioration of insulation etc. Need to be removed.

For these applications, nonflammability and low toxicity,
Since it has many characteristics such as excellent solubility in oils and fats and flux, 1,1,2-trichloro-
Although 1,2,2-trifluoroethane and 1,1,1-trichloroethane are widely used, they are decomposed by ultraviolet rays in the stratosphere and release chlorine to destroy the ozone layer, which is harmful to the earth. It has been pointed out that as a result of increasing the amount of ultraviolet rays, it will seriously affect the ecosystem on the earth including humankind, which has become a global problem. For this reason, there is an international agreement to regulate the production and consumption of these substances and to eliminate them altogether. Under these circumstances, various non-halogen alternative cleaning agents that have little impact on the environment have been proposed, but none satisfying all the required performances has been obtained yet.

For example, terpenes are excellent in detergency but have a low flash point, which is a safety problem. Moreover, JP-A-3-16
Although glycol monoalkyl ether compounds have been proposed in Japanese Patent Publication No. 249 and Japanese Patent Application Laid-Open No. 3-97792, for example, diethylene glycol monobutyl ether having a relatively small number of carbon atoms in the alkyl group has high solubility in water. As a result, the burden on wastewater treatment increases. When the number of carbon atoms in the alkyl group is large, such as diethylene glycol monohexyl ether, the solubility in water is low and the burden on wastewater treatment is light, but the liquid viscosity is high and the detergency is poor.

JP-A-3-227400 proposes glycols of the dialkyl ether type, but diethylene glycol dimethyl ether and diethylene glycol diethyl ether, which are specifically described in the examples, have extremely high solubility in water and wastewater treatment. Is a heavy burden.

[0007]

In view of the above, the present invention provides a new cleaning solvent which is excellent in detergency and separability from water and which is substantially satisfactory in flammability. Is.

[0008]

Means for Solving the Problems As a result of extensive studies conducted by the present inventor to achieve the above object, the following general formula (1)
It was found that a detergent containing a glycol ether represented by the formula (1) as an active ingredient can achieve the above object, and completed the present invention. The present invention provides a new cleaning solvent which is excellent in detergency and separability from water and which is substantially satisfactory in flammability.

That is, the present invention is a detergent containing a glycol ether represented by the following general formula (1) as an active ingredient.

[0010]

[Chemical 2]

The present invention will be described in detail below. The glycol ether represented by the general formula (1) of the present invention includes ethylene glycol monocyclohexyl ether,
Ethylene glycol methyl cyclohexyl ether, ethylene glycol ethyl cyclohexyl ether, ethylene glycol propyl cyclohexyl ether, ethylene glycol isopropyl cyclohexyl ether,
Ethylene glycol butyl cyclohexyl ether, ethylene glycol pentyl cyclohexyl ether, ethylene glycol hexyl cyclohexyl ether, ethylene glycol dicyclohexyl ether and corresponding di- or tri-ethylene glycol ethers, propylene glycol monocyclohexyl ether, propylene glycol methyl cyclohexyl ether, propylene Glycol ethyl cyclohexyl ether, propylene glycol propyl cyclohexyl ether, propylene glycol isopropyl cyclohexyl ether, propylene glycol butyl cyclohexyl ether, propylene glycol pentyl cyclohexyl ether, propylene glycol hexyl cyclohexyl ether Di corresponds to the propylene glycol dicyclohexyl ether and these - can be exemplified propylene glycol ethers - or tri.

These glycol ethers can be used alone or in combination of two or more. Saturated aliphatic hydrocarbons, saturated alicyclic hydrocarbons, alkanolamines, nonionic surfactants, rust preventives, water and the like can be added to the detergent of the present invention as needed.

The saturated aliphatic hydrocarbon or saturated alicyclic hydrocarbon is preferably one that does not impair the high flash point, and examples thereof include decane, undecane, dodecane, tridecane, tetradecane, pentadecane, menthane, bicyclohexyl, cyclododecane, Decalin, 2, 2, 4, 4, 6,
Examples include 8,8-heptamethylnonane, 2,6,10,14-tetramethylpentadecane, and these may be added alone or in combination. Addition amount is 0-9
It is preferably 0% by weight, more preferably 0 to 70% by weight.

Examples of the alkanolamine include monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N-ethylethanolamine, N-propylethanolamine, N
-Methylethanolamine and the like. The addition amount is
The amount is preferably 0 to 30% by weight, more preferably 0 to 15% by weight.

Examples of the nonionic surfactant include, for example,
Polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polystyryl phenyl ether, polyoxyethylene-polyoxypropylene glycol, polyoxyethylene-
Polyoxypropylene alkyl ether, polyhydric alcohol fatty acid partial ester, polyoxyethylene polyhydric alcohol fatty acid partial ester, polyoxyethylene fatty acid ester, polyglycerin fatty acid ester, fatty acid diethanolamide, polyoxyethylene alkylamine, triethanolamine fatty acid partial ester Etc. can be mentioned and these can be used individually or in combination of 2 or more types. The addition amount is 0 to 30% by weight, preferably 0 to 15
% By weight.

As the rust preventive agent, known rust preventive agents such as fatty acids, metallic soaps, amines, esters, dicyclohexylammonium nitrite, diisopropylamine nitrite, dicycloamine caprate and benzotriazole may be used alone or in combination of two or more kinds. Can be used.

[0017]

The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

[0018]

[Examples 1 and 2 and Comparative Examples 1 to 4] The solvents shown in Table 1 were compared and evaluated for "separability with water", "degreasing rate", and "rosin dissolution rate". The results are shown in Table 1. The evaluation of each performance was performed by the following methods. "Separability from water": Mix equal volumes of solvent and water,
The separated state after 5 minutes was visually observed.

◯: Well separated ×: Not separated “Degreasing rate”: 30 mesh stainless mesh of 2 cm in width and 5 cm in length was pressed oil (manufactured by Nippon Petrochemical Co., Ltd., Unipress DP-1).
After immersing in 20) and adhering about 0.5 g of pressing oil thereto, ultrasonic cleaning was carried out in 100 ml of solvent at 40 ° C. for 1 minute. The residual oil was extracted with carbon tetrachloride and measured with an oil concentration meter to obtain the degreasing rate.

◯: Degreasing rate of 99% or more Δ: 90 to 99
% X: less than 90% "Rosin dissolution rate": About 0.5 g of rosin was melted, and tablets were immersed in 50 ml of solvent for 7 minutes while shaking, and then the dry weight was measured to determine the dissolution rate. ◯: Dissolution rate 30% or more Δ: 15 to 30% ×: 1
Less than 5% For the solvents used in Comparative Examples 1 to 4, as shown in Table 1 for the above evaluation items, satisfactory results were not obtained.

The terpene-based limonene used in Comparative Example 1 has good separability from water and cleanability, but has a low flash point and presents a safety problem. The diethylene glycol monobutyl ether used in Comparative Example 2 has good detergency, but has a problem of separability from water. The diethylene glycol monohexyl ether used in Comparative Example 3 has good separability from water, but has a problem in detergency.

The diethylene glycol diethyl ether used in Comparative Example 4 has good detergency, but has a problem of separability from water.

[0023]

Example 3 60% by weight of propylene glycol cyclohexyl ether, 30% by weight of petroleum solvent (trade name: No. 0 solvent M) manufactured by Nippon Petrochemical Co., Ltd., polyoxyethylene nonylphenyl ether type nonionic surfactant ( Toho Chemical Industry Co., Ltd .: Product name: Nonal 21
0) A flux cleaning test of a cleaning agent prepared by putting 10% by weight in a 1-liter beaker and stirring and mixing was carried out by the following method.

Flux (trade name: F-230V) manufactured by Tamura Seisakusho Co., Ltd. was applied to a glass epoxy printed circuit board, which was soldered in a molten solder bath as an article to be washed and dipped in the above cleaning agent for 2 minutes. After ultrasonic cleaning,
After rinsing with water, the cleaning effect was visually evaluated according to the following criteria. ◯: Almost no residual Δ: Slightly residual X: Significant residual results are shown in Table 2.

[0025]

Examples 4 to 7 Tests were conducted in the same manner as in Example 3 except that the cleaning composition was changed as shown in Table 2. The results are shown in Table 2.

[0026]

[Table 1]

[0027]

[Table 2]

[0028]

As is clear from the examples, the cleaning agent of the present invention has an excellent cleaning power, is easy to treat wastewater, and has a low risk of ignition, so that it is a new cleaning agent that does not cause ozone layer depletion. Is extremely useful as

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Claims (1)

[Claims] 1. A detergent containing a glycol ether represented by the following general formula (1) as an active ingredient. [Chemical 1]