JPH0468090A - Degreasing detergent - Google Patents

Abstract

PURPOSE:To obtain a detergent for degreasing which is excellent in qualities and replaces the conventional fluorocarbon and chlorine-base solvents by compounding specified alcohols and fatty acid esters. CONSTITUTION:A detergent for degreasing comprising 3 to 4C alcohols and fatty acid esters. The detergent has good degreasing performance and finish comparable with those of the conventional fluorocarbon and chlorine-base solvents and does not destruct ozone. Further, the conventional apparatus for cleaning can be used substantially as they are, since the detergent can readily be recovered by boiling or distillation by the use of a washing machine and a distiller which have been used for the recovery of the conventional fluorocarbon and chlorine-base solvents. In addition, water rinse for removing the detergent from the washed article is not necessary in working steps, since it has a low boiling point and thus the washed article is ready to dry. Accordingly, there is no possibility of polluting water environment with waste water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composition for degreasing and cleaning materials, such as mechanical parts, to which oil-soluble oil has adhered during manufacturing and processing steps.

C. Conventional technology] Traditionally, in metal parts processing industries such as machinery and automobile industries,
In the manufacturing process, various oils such as cutting oil, processing oil,
Many hydrocarbon oils such as press oil and grease are used, and since these adhere to various parts (objects to be washed), they are washed and removed as appropriate. Freon 1 has traditionally been used as a solvent to wash and remove these oils and greases.
13 or chlorinated solvents such as methyl chloroform and trichloroethylene have been used. These solvents have a high ability to dissolve oil and grease and are nonflammable, so they are used in a wide range of industrial fields, such as for degreasing and cleaning metals, developing dry films for printed circuit boards, and the like.

[Problem that the invention is trying to solve]

However, as society's awareness of environmental issues increases, there is a movement to regulate the discharge of environmentally destructive substances into the atmosphere and water systems. For example, fluorocarbon solvents (5 types of specified fluorocarbons:
CFCll, CFCl2. CFCll3. C.F.C.
The use of 114°CFCll5) and methyl chloroform as ozone layer depleting substances, and trichlorethylene as a groundwater pollutant, is being restricted.

Under such circumstances, the industry that uses chlorinated solvents such as Freon 113, methyl chloroform, and trichloroethylene is rapidly seeking degreasing detergents that can replace these solvents.

[Means to solve problems]

The present inventors have discovered that Freon 113 used in degreasing detergents
As a result of repeated research into cleaning agents that can replace chlorinated solvents such as methylchloroform and trichloroethylene, we have found that
A composition containing one or more types of alcohols (4) and fatty acid esters as essential components has a high degreasing property comparable to conventional degreasing detergents (chlorofluorocarbon 113 and chlorinated solvents such as methyl chloroform and trichloroethylene). It was discovered that the cleaning agent exhibits good performance and finish quality, and based on this knowledge, the present invention was developed.

That is, the present invention is a degreasing detergent characterized by containing as essential components: (1) one or more alcohols having 3 to 4 carbon atoms; and (2) fatty acid esters.

In the present invention, the composition of the alcohol having 3 to 4 carbon atoms and the fatty acid ester is preferably such that the concentration of the fatty acid ester is 10 to 30% by weight based on the total amount of the composition.

The alcohols having 3 to 4 carbon atoms used in the present invention include:
Examples include n-propanol, isopropanol, n-butanol, S-butanol, isobutanol, and t-butanol. These may be used alone or in combination of two or more.

Examples of fatty acid esters used in the present invention include ethyl acetate, propyl acetate, isopropyl acetate, and 5eC acetate.
-butyl, isobutyl acetate, isoamyl acetate, methyl n-butyrate, ethyl n-butyrate, ethyl propionate, isobutyl formate, ethyl isovalerate, and the like. These may be used alone or in combination of two or more.

The combination of essential components in the present invention can be arbitrarily changed depending on the material and form of the object to be washed, the type of dirt, etc. Among the essential components, if alcohol is missing, fatty acid esters will have too strong of an odor, which is a problem when using them, and will be extremely difficult to tolerate in practice, making them unsuitable as cleaning agents. On the other hand, when fatty acid esters are lacking, the degreasing ability decreases.

Therefore, a practical cleaning agent can only be obtained by using both at the same time.

Furthermore, it is possible to add various stabilizers and additives to the composition of the present invention in order to maintain the stability of the liquid and improve the stability against the objects to be washed, or to improve the dissolving power. Examples of stabilizers and additives include hydrocarbons, ethers, acetals, ketones, nitroalkanes, amines, benzotriazoles, and the like.

〔Example〕

Hereinafter, the present invention will be specifically explained using Examples and Comparative Examples. The cleaning method is as follows.

Cleaning method ■ As shown in Figure 1, a capacity 100-
Three hard glass washers (a first tank, a second tank, and a third tank) were prepared, and the composition of the present invention or a comparative solvent 30 (W) was put in the multi-tank, the first tank was a boiling tank, and the third tank was a boiling tank. The second tank was a cold bath (room temperature), and the third tank was a steam bath.

■ Apply various oils to the items to be washed (50 mm x 50 mm square SUS plates) [press oil (Nippon Oil Co., Ltd., stock system, product name, Unipres ER-500), drawing oil (Idemitsu Oil Co., Ltd. (stock system, product name: Daphne) Master Toro-522WD)] to 0
．． A sample was prepared in which 10 g was uniformly applied.

(2) The above-mentioned items to be washed were immersed in multiple tanks in order for 1 minute (however, in the third tank, the items to be washed were simply put into the steam layer).

■ The weight of the items to be washed was measured, the amount of residual oil was measured, and the cleanliness of the appearance was visually judged.

Examples 1-7 A cleaning experiment was conducted on the compositions shown in Table 1.

The results are shown in Table 3.

Comparative examples 1 to 7 Cleaning experiments were conducted using the solvents shown in Table 2.

The results are shown in Table 3.

Judgment criteria for Table 1 (note) in the margins below: No residual oil content...Residual amount less than 0.0000 Slightly remaining...Residual amount o, oooo or more 0.001
Less than 0 considerably remaining...Residual amount is 0.0010 or more Appearance cleanliness - 0...No oil stain It has degreasing performance and finish quality comparable to that of solvent-based solvents, and
It doesn't destroy ozone. Furthermore, since the composition of the present invention can be easily recovered by boiling or distillation in the washing machines and distillers used for conventional fluorocarbon and chlorine solvents, conventional equipment can be used almost as is. You can.

Furthermore, since the composition of the present invention has a low boiling point, it is easy to dry the items to be washed, so there is no need for steps such as water rinsing to remove the cleaning agent from the items to be washed during the work process. . Therefore, there is no fear that the water environment will be contaminated by wastewater.

Therefore, the composition of the present invention is practically an excellent degreasing detergent that can replace conventional fluorocarbon-based and chlorinated solvents.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a method of cleaning objects to be washed using cleaning agents of Examples and Comparative Examples. Go to the 2nd tank 3rd tank weight measurement

Claims (2)

[Claims] 1. (1) One or more alcohols having 3 to 4 carbon atoms, and (2) fatty acid esters, A degreasing detergent characterized by containing as an essential ingredient.