JP2616847B2 - Additives for alkaline cleaners for metal products and alkaline cleaner compositions for metal products containing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal processing product which can be added to an alkaline cleaning agent to remarkably improve the wastewater treatment of cleaning wastewater while maintaining high cleaning performance and low foaming property in the cleaning process. TECHNICAL FIELD The present invention relates to an additive for an alkaline detergent for use and an alkaline detergent composition for a metal product containing the same.

[0002]

2. Description of the Related Art Conventional alkaline cleaning agents for metal products have poor wastewater treatment properties. There was a problem that they did not match.

[0003] Therefore, there has been a demand for the development of an additive for an alkali cleaner for metal products having high detergency and high wastewater treatment performance, and an alkali detergent composition for metal products containing the same. .

[0004]

Under such circumstances, the present inventors have conducted intensive studies to satisfy such a demand, and as a result, have been able to use an additive containing a specific branched carboxylic acid or a salt thereof. For example, the present inventors have found that an alkaline cleaning composition for a metal work product which can suppress foaming of a cleaning liquid while maintaining high detergency and has improved wastewater treatment properties can be obtained, and completed the present invention.

That is, the present invention provides the following general formula (1)

[0006]

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[In the formula, R ¹ and R ² are the same or different and each represents a straight-chain or branched-chain alkyl group having 6 to 8 carbon atoms, the total of which is 6 or more. , M represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an aliphatic amine having 1 to 4 carbon atoms, ammonia, or a mono-, di- or trialkanolamine.
The present invention provides an additive for an alkali cleaning agent for metal products, which comprises a branched carboxylic acid or a salt thereof represented by the formula: and an alkali cleaning composition for a metal product containing the same.

The branched carboxylic acid (1) used in the present invention
Preferred specific examples include those represented by the following formula (1a).

[0009]

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The branched carboxylic acid (1) in the present invention can be used as it is or as a salt. Specific examples of the salt include alkali metals such as potassium and sodium; alkaline earth metals such as calcium and magnesium;
C1-C4 aliphatic amines, such as methylamine, ethylamine, propylamine, and diethylenetriamine; Ammonia; C2-C10 alkanolamines, such as monoethanolamine and triethanolamine.

The branched carboxylic acid (1) or a salt thereof in the present invention can be produced, for example, by oxidizing an alcohol obtained by subjecting an aldehyde to aldol condensation by the oxo method, and then forming a salt if necessary. Commercially available ones can be used, and examples thereof include isostearic acid or a salt thereof manufactured by Nissan Chemical Industries, Ltd.

Further, when the additive of the present invention is added to the alkaline detergent composition for metal products, the branched carboxylic acid or its salt in the additive is washed out when the detergent is subjected to coagulation and precipitation in the wastewater treatment step. Acts as a coagulant for the surfactant and the organic chelating agent in the agent composition, and can improve the wastewater treatment property. In this case, the addition amount is preferably 0.1 to 30% by weight based on the total amount of the detergent composition, as the amount of the branched carboxylic acid or its salt (1).

The alkaline detergent composition for metal products to which the additive of the present invention is added is an alkaline detergent having a pH at the time of use of 10 or more. (B) Chelate builder,
(C) Nonionic surfactants, (d) anionic surfactants, (e) cationic surfactants, and (f) amphoteric surfactants.

The alkali builder of the component (a) is a water-soluble alkali agent, for example, sodium hydroxide, sodium hydroxide, sodium orthosilicate, sodium metasilicate, sodium phosphate, sodium orthophosphate, sodium metaphosphate, sodium tripolyphosphate, carbonate carbonate Soda and the like.

Examples of the chelate builder of the component (b) include aminocarboxylic acid type chelate builders and oxycarboxylic acid type builders. Specific examples thereof include glycine, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and ethylenediaminediacetic acid. , An alkali metal salt such as hydroxyethylethylenediamine triacetic acid or a lower amine salt or gluconic acid, citric acid, malic acid, an alkali metal salt such as glucoheptonic acid or
And lower amine salts.

The nonionic surfactant of component (c) is HL
There is no particular limitation as long as it is B3-18, but for example, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl aryl ether, polyoxyalkylene alkyl amino ether, sorbitan fatty acid ester, polyoxyethylene fatty acid ester, glycerin fatty acid mono (di) Esters and the like.

Examples of the anionic surfactant (d) include metal soaps of fatty acids, alkyl sulfates, and alkyl sulfonates. Specific examples include sodium higher alcohol sulfate, ammonium lauryl sulfate, and trioctyl sulfate. Examples thereof include ethanolamine, sodium dodecylbenzenesulfonate, sodium alkylnaphthalenesulfonate, sodium polyoxyethylene alkylphenyl ether sulfate, and sodium salts of β-naphthalenesulfonic acid formalin condensate.

As the cationic surfactant of the component (e), alkylamine acetate, alkylamine hydrochloride,
And quaternary ammonium salts.

As the amphoteric surfactant of the component (f), alkyldimethylamine oxide, alkylcarboxymethylhydroxyethylimidazolium betaine,
Alkyl amino carboxylate and the like can be mentioned.

The alkaline detergent composition for a metal workpiece of the present invention is produced by a conventional method by blending the above components, and is used for cleaning metal workpieces such as cold-rolled steel sheets, machine metals, and metal pipes.

[0021]

The alkaline detergent composition for metal products of the present invention has a high detergency and an excellent foaming suppressing effect while maintaining high detergency. Improvements in quality, productivity, and the like can be achieved. In addition, since it has excellent wastewater treatment properties, it is extremely useful for environmental protection.

[0022]

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

Example 1 Using the additives shown in Table 1 below, metal detergent compositions having the compositions shown in Table 2 were prepared, and the cleaning properties, low foaming properties, and wastewater treatment properties were evaluated. Table 2 shows the results.

[0024]

[Table 1]

[Cleaning Conditions and Evaluation Method] (1) Preparation of Test Material Commercially available stainless steel plate (SUS-304: 100 mm long ×
Crude degreasing was performed on a 50 mm wide x 0.5 mm thick) with a solvent (hexane + ethanol), and then completely degreased with an alkaline cleaning solution. A commercially available metal working oil (main component: mineral oil, ester, fatty acid) was applied to the steel sheet, and heated in a dryer at 150 ° C. for 24 hours to thermally degrade the working oil. This was used as a test material.

(2) Method of evaluating cleanability The test material was cleaned under the following conditions. (Washing conditions) Water used: Ion-exchanged water Detergent composition amount: 500 ml Detergent composition temperature: 50 ° C. Treatment time: 1 minute (Evaluation method) Washing the washed stainless steel sheet with a large amount of tap water and washing the steel sheet surface After the agent components were completely removed, the water wettability of the steel sheet surface (the ratio of the entire surface area of the steel sheet to water) was evaluated.

(3) Evaluation method of low foaming property The liquid temperature was 60 ° C., which was evaluated by the Ross Miles method, and the foaming height was evaluated 5 minutes after dropping.

(4) Wastewater treatment property Each of the experimental solutions was diluted 100 times with distilled water, and 1000
ml was used as a treatment liquid. The treatment was performed by the coagulation precipitation method using ferric chloride. (Wastewater treatment method) The washing solution was diluted 100-fold, HCl was added thereto, and the pH was adjusted to 5%.
After adjusting to pH 7, FeCl ₂ was added, Ca (OH) ₂ was added to adjust the pH to 7, and the mixture was filtered.
The OD value was measured. (Evaluation of wastewater treatment properties) COD concentration (ppm) after wastewater treatment was shown.

[0029]

[Table 2]

[Evaluation Results] As a result, as shown in Table 2, the metal detergent composition to which the additive of the present invention was added (Experiment No. (8)) had good cleaning properties, low foaming properties, and good wastewater treatment properties. there were.

Claims (3)

(57) [Claims] 1. The following general formula (1): [Wherein, R ¹ and R ² are the same or different and each represent a straight-chain or branched-chain alkyl group having 6 to 8 carbon atoms, the sum of the degrees of branching of which is 6 or more; A hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an aliphatic amine having 1 to 4 carbon atoms, ammonia, or a mono-, di- or trialkanolamine]] or a salt thereof. An additive for an alkaline cleaning agent for metalwork products, characterized by the following. 2. The branched carboxylic acid is represented by the following formula (1a): The additive for an alkali cleaner for a metal product according to claim 1, which is represented by the following formula. 3. An alkaline cleaning composition for metal products, which contains the additive according to claim 1 or 2 as an essential component and has a pH of 10 or more.