JP3228795B2 - Low foam detergent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to metal, ceramics,
The present invention relates to an aqueous cleaning agent used for degreasing cleaning of glass, plastic, and the like.

[0002]

2. Description of the Related Art Conventionally, as industrial degreasing agents for metals, ceramics, glass, plastics, etc., aqueous detergents represented by alkali detergents and solvent detergents represented by 1,1,1-trichloroethane have been used. Cleaning agents are used.

[0003] Alkali detergents include nonionic surfactants represented by polyoxyethylene alkylphenyl ether, surfactants such as anionic surfactants represented by sodium alkylbenzenesulfonate, sodium carbonate, sodium silicate, and boron. Sodium salts, sodium phosphate, sodium hydroxide, alkali salts such as potassium hydroxide, sodium tripolyphosphate, EDTA, NTA,
A chelating agent such as gluconate, a rust inhibitor such as benzotriazole, amines, alkanolamines, and sodium nitrite, etc. are appropriately blended. Its composition is
For example, Tsuji recommendation "Precision cleaning technology" engineering book p117-
120, "Precision Cleaning Technology Manual" by Tsuji recommendation, as described in New Technology Development Center, pp. 50-56, various proposals are made according to articles to be cleaned, metals, and stains. However, since the degreasing power and the osmotic power are inferior to chlorine solvents such as 1,1,1-trichloroethane and the like, as an actual field of application, the cleaning of articles having a simple structure and the amount of residual oil after cleaning are required. Mainly in fields that do not care much.

On the other hand, chlorinated solvents such as 1,1,1-trichloroethane have excellent degreasing power and penetrating power, and can be applied to all kinds of degreasing such as cutting oil, drawing oil, and press oil.
It is used in the field of cleaning articles having a complicated structure and precision parts requiring high cleanliness. However, in recent years, environmental problems such as groundwater pollution, air pollution, and ozone depletion caused by chlorine-based solvents have become prominent. I am doing it.

[0005]

However, the conventional alkaline cleaning agent is inferior in the degreasing power and the penetrating power as compared with the chlorine-based solvent. It cannot be applied to the case where it adheres to the details or to the case where a very small amount of residual oil on the surface of the part is a problem. Although it is conceivable to use a large amount of a nonionic surfactant in order to increase the degreasing power and the penetrating power, it is difficult to obtain a stable concentrated liquid as a product, and there are problems such as increased foaming. In addition, it is conceivable to increase the pH by increasing the amount of alkali salt in order to increase the degreasing power. However, this also makes it difficult to obtain a stable liquid state as a product. It is not preferable from the viewpoint of safety.

As a method for forming a stable liquid state, for example, there is a method in which sodium aromatic carboxylate is used in combination as shown in JP-B-63-13480, but it is used as a representative of sodium aromatic carboxylate. There is a problem that para-tert-butyl sodium benzoate is highly toxic to kidneys and liver. There is a method of adding a surfactant with a low cloud point to suppress foaming, and washing at a temperature higher than the cloud point.However, in this case, the washing liquid becomes cloudy white, the washing parts in the washing liquid become invisible, and the state of the parts Cannot be observed, and the degree of contamination of the cleaning liquid cannot be grasped.

[0007]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that the above problem can be solved by using a specific nonionic surfactant and an aliphatic carboxylic acid, and complete the present invention. Reached. That is, the present invention provides (A) at least 1 to 20% by weight of a nonionic surfactant represented by the following general formula (I).

Embedded image [In the formula, R represents a cyclohexyl group, n represents an integer of 2 to 3, and m + p represents an integer of 1 to 10.] (B) 1 to 20% by weight of an aliphatic carboxylic acid having 6 to 12 carbon atoms (C ) Low-foaming detergent characterized by containing water.

In the present invention, the amount of the surfactant (A) is 1 to 20% by weight, preferably 1 to 10% by weight, more preferably 2 to 5% by weight. If this amount is less than 1% by weight, the washing property is reduced, and
If it is larger, it is difficult to maintain a stable liquid state, which is not preferable. Even if only one type of surfactant (A) is used,
One or more of them may be used.

The aliphatic carboxylic acid as the component (B) is an essential component for keeping the detergent of the present invention in a stable liquid state in a wide temperature range from a low temperature of 0 ° C. or lower to a high temperature of 50 ° C. or higher. Specifically, hexanoic acid, heptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, 3,5,5-
Trimethylhexanoic acid, decanoic acid, undecanoic acid, dodecanoic acid and the like. When the number of carbon atoms is less than 6, an unpleasant odor becomes strong. When the number of carbon atoms is more than 12, foaming becomes large, which is not preferable. If the amount is less than 1% by weight, it is difficult to maintain a stable liquid state,
If the amount is more than that, the degreasing power is undesirably reduced.

[0010] The water of the component (C) is used as a solvent for the surfactant of the component (A) and the detergent active ingredient of the aliphatic carboxylic acid of the component (B) to form a uniform liquid product. The amount is determined so that the total amount of water and the amount of the above-mentioned cleaning agent active ingredient and known additives and the like will be 100% by weight.

When the cleaning agent of the present invention is used in an actual cleaning step, it is used after further diluting with water. The dilution concentration at that time is usually 1 to 10% by weight. The dilution concentration is appropriately adjusted depending on conditions such as a cleaning method, a cleaning article, and a stain.

In the present invention, other known additives such as polyoxyethylene alkyl ether,
Nonionic surfactants such as polyoxyethylenealkyl phenyl ether, surfactants such as anionic surfactants, and salts such as carbonates, silicates, borates, phosphates, sodium hydroxide, and potassium hydroxide , Chelating agents such as sodium tripolyphosphate, gluconate, EDTA, NTA,
Corrosion inhibitors such as benzotriazole, amines, alkanolamines, and nitrite, antifoaming agents, and solvents such as alcohol, glycol, and glycol ether can be appropriately blended and used.

[0013]

The present invention will be described below with reference to examples.

Examples 1-4 and Comparative Examples 1-2 The detergents shown in Table 1 were blended and the following tests were conducted. Table 2 shows the results. (1) Degreasing and Penetration Test A 30-mesh stainless steel mesh (60 × 30 mm) was impregnated with the following metal working oil and heated at 100 ° C. for 30 minutes.
This was washed with a 3% by weight aqueous solution of a detergent, and the degreasing rate was calculated from the amount of oil adhering before and after washing by the following equation (1), and 1,1,1
Comparative evaluation with degreasing with trichloroethane. Metal working oil used for the test Cutting oil: Unicut GH35 (trade name, manufactured by Nippon Oil Co., Ltd.) Press oil: Unipres DP120 (trade name, manufactured by Nippon Oil Co., Ltd.) (2) Stability test The cleaning agent was -5 ° C. While maintaining the temperature at 30 ° C. and 60 ° C., it was observed whether the active ingredient of the detergent was separated or precipitated. (3) Foaming test 50 ml of a 3% by weight aqueous solution of the detergent was placed in a 100-ml measuring cylinder, shaken vigorously, allowed to stand, and the height of foaming was measured. (4) Cloud Point Test A 3% by weight aqueous solution of the detergent was placed in a test tube, the temperature was raised from 20 ° C., and the temperature at which the solution became cloudy was measured.

[0014]

(Equation 1)

[0015]

[Table 1]

The numbers in the table indicate% by weight. 1) Surfactant of the general formula (I) a1: n = 2, m + p = 2 〃 a2: n = 2, m + p = 6 〃 a3: n = 3, m + p = 2 2) aliphatic carboxylic acid b1: nonanoic acid 〃 b2: 3,5,5-trimethylhexanoic acid 3) Other nonionic surfactant: polyoxyethylene octyl phenyl ether (addition of 8 mol of ethylene oxide on average)

[0017]

[Table 2] 1) When the degreasing rate is equivalent to degreasing with 1,1,1-trichloroethane; 〇 Inferior; × 2) No change; 変 化 When sedimentation and separation are observed; × 3) Foam height is 20 mm Below; 〇 20 mm or more; × 4) Cloud point of 80 ° C. or more; 未 満 less than 80 ° C .; ×

[0018]

EFFECT OF THE INVENTION The cleaning agent of the present invention has a degreasing power and a penetrating power comparable to that of a chlorine-based solvent, has little foaming, is transparent, and can observe the state during cleaning of the cleaning object and the degree of contamination of the cleaning liquid, and is stable. It is an excellent water-based cleaning agent having an excellent liquid state.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ryoji Kaneda 1-14-25, Yoshiyukizaka, Fujisawa City, Kanagawa Prefecture (72) Inventor Takashi Tokue 97-6, Ichizawamachi, Asahi-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-4-13799 (JP, A) JP-A-4-142399 (JP, A) JP-A-4-57897 (JP, A) JP-A-4-88098 (JP, A) JP-A-63-121685 ( JP, A) JP-A-4-57898 (JP, A) JP-A-63-168498 (JP, A) JP-A-63-121685 (JP, A) JP-A-4-142399 (JP, A) (58) ) Field surveyed (Int.Cl. ⁷ , DB name) C11D 1/00-7/60 C23G 5/036 CA (STN)

Claims (1)

(57) [Claims] (1) at least (A) 1 to 20% by weight of a nonionic surfactant represented by the following general formula (I): [In the formula, R represents a cyclohexyl group, n represents an integer of 2 to 3, and m + p represents an integer of 1 to 10.] (B) 1 to 20% by weight of an aliphatic carboxylic acid having 6 to 12 carbon atoms (C A low-foaming detergent characterized by containing water.