JPH11106799A - Liquid alkaline detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid alkaline detergent composition having a high stability, detergency and foam-inhibiting property and a low viscosity. SOLUTION: A detergent composition contains 10 to 35 wt.% (based on Na2 O) alkaline agent, from 1 to 10 wt.%. aliphatic or aromatic compound having 1 to 5 polar groups per molecule, 0.1 to 10 wt.% polyacrylic acid or its salt and 0.1 to 10 wt.% amino carboxylate or its salt. Furthermore, it contains at least one chosen from a higher alcohol, a surfactant and a chelating agent, which further improves the detergency or the foam-inhibiting property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid alkaline cleaning composition used for cleaning dirt on hard surfaces such as metals, glass, ceramics, and plastics.

[0002]

2. Description of the Related Art Conventionally, alkaline detergents have been used industrially because they are excellent in cleaning dirt such as animal and vegetable oils and fats and mineral oils firmly attached to hard surfaces such as metals and glass. Industrially, a liquid alkaline cleaning agent is used as an alkaline cleaning agent because of the necessity of replenishment in a fixed amount. Liquid alkali detergents are generally used after being diluted to a predetermined alkali concentration with water.To minimize storage space or reduce transportation costs, high-concentration alkalis may be used. Is desired.

[0003] The liquid alkaline cleaning agent cannot provide sufficient detergency with the alkaline agent alone, and foams when dirt components such as animal and vegetable oils and fats attached to an object to be cleaned are accumulated in the cleaning agent. Therefore, in general, components such as a surfactant, a chelating agent, and alcohol for improving the detergency and the defoaming property are blended. However, the one-pack type alkaline cleaning agent is separated from the alkaline agent,
There is a great limitation on the types and amounts of drugs that can be blended, and further, there is a limitation that the concentration of the alkali itself cannot be too high.

[0004] As a method for solving this problem, for example, Japanese Patent Application Laid-Open No. 7-41974 proposes to include an aromatic compound having 2 to 50 polar groups as a slurry stabilizer. However, in this method, the viscosity increases with the concentration, so that the stirring power is increased, bubbles are not easily removed at the time of stirring, and it is necessary to increase the pump capacity when transferring through a pipe. There is a problem that there is a restriction on the strategic use. In particular, the problem becomes remarkable when applied to a process using a large amount of a cleaning agent, for example, a steel cleaning line.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to satisfy the detergency and defoaming properties, and to stably blend components such as surfactants, chelating agents and alcohols in high-concentration alkalis.
And a liquid alkali cleaning composition having a low viscosity.

[0006]

SUMMARY OF THE INVENTION The present invention provides an alkaline agent,
A liquid alkaline detergent composition comprising an aliphatic compound or aromatic compound having 1 to 5 polar groups in one molecule, polyacrylic acid or a salt thereof, and an aminocarboxylic acid or a salt thereof. .

Further, the present invention relates to a method for preparing an alkaline agent comprising 10 to 35% by weight of Na ₂ O, 1 to 10% by weight of an aliphatic or aromatic compound having 1 to 5 polar groups in a molecule,
A liquid alkaline cleaning composition comprising 0.1 to 10% by weight of polyacrylic acid or a salt thereof and 0.1 to 10% by weight of an aminocarboxylic acid or a salt thereof.

The liquid alkaline detergent composition according to the present invention comprises an alkaline agent, an aliphatic or aromatic compound having 1 to 5 polar groups in one molecule, polyacrylic acid or a salt thereof, and an aminocarboxylic acid or a salt thereof. including.

The alkaline agent is an alkaline component as a main cleaning agent, and may be any water-soluble alkaline agent. From the viewpoint of increasing the alkali concentration, examples thereof include sodium hydroxide and potassium hydroxide. The concentration of the alkaline agent is
A liquid alkaline detergent compositions 10 to 35 (Na ₂ O basis)% by weight, preferably 15 to 30 (Na ₂ O basis)% by weight. If it is less than 10% by weight, the concentration cannot be sufficiently increased, and if it exceeds 35% by weight, the viscosity rises and the viscosity cannot be reduced, which is not preferable.

An aliphatic or aromatic compound having 1 to 5 polar groups is a component as a stabilizer, and a detergent component such as a surfactant or alcohol which is hardly soluble in a high-concentration alkaline agent is uniformly dispersed. It has a function to make The concentration of this component is from 0.1 to 10% by weight in the liquid alkaline cleaning composition. If it is less than 0.1% by weight, a stable liquid alkaline detergent composition cannot be obtained, and if it exceeds 10% by weight, the viscosity is increased and the viscosity cannot be reduced, which is not preferable.

The polar group is not particularly limited as long as it does not decompose or hardly decomposes in an aqueous alkali solution and shows relatively strong hydrophilicity. For example, COOM, SO ₃ M, NH ₂ , NO ₂ , NR ₁
One or more types can be selected from a group consisting of H, NR ₂ R ₃ and OH. Here, M represents hydrogen, an alkali metal, an alkaline earth, an aliphatic amine having 1 to 4 carbon atoms, ammonium or an alkanolamine, and R ₁ , R ₂ , and R ₃ are the same or different groups. Represents a straight-chain or branched, saturated or unsaturated hydrocarbon group of 1 to 4; Of these, groups containing COOM and SO ₃ M are particularly preferred.

Examples of such an aliphatic compound having two or more polar groups include adipic acid, azelaic acid, sebacic acid, octenylsuccinic acid, dodecenylsuccinic acid, N
-Octyl-β-dialanine, N-lauryl-β-dialanine, hexamethylenediamine, butadiene-1,4
-Dicarboxylic acid, heptene-1,7-disulfonic acid, butylene-1,4-disulfonic acid, laurylsulfonic acid, and acetic acid, propionic acid, butyric acid, and octanoic acid as one polar group. Can also use its salt.

The aromatic compound having a polar group is not particularly limited, but those described below are preferable, and these can be used alone or in a mixture of two or more.

Polyacrylic acid or a salt thereof is a component as a viscosity modifier, and can lower the viscosity without impairing the stability. Its concentration is from 0.01 to 10% by weight in the liquid alkaline cleaning composition. 0.0
If the amount is less than 1% by weight, the effect of lowering the viscosity as a viscosity modifier is not exhibited, and if it exceeds 10% by weight, the effect is hardly changed. The weight average molecular weight of the polyacrylic acid is not particularly limited, but those having a molecular weight of 1,000 to 200,000 are generally used. If it is less than 1,000, the effect of lowering the viscosity as a viscosity modifier is small, and if it exceeds 200,000, the dissolution in high concentration alkali is poor.

Aminocarboxylic acid or a salt thereof is a component generally used as a cleaning aid. In the present invention, aminocarboxylic acid or a salt thereof is used as a component to assist the stabilizing action of an aliphatic compound having a polar group or an aromatic compound. . The concentration of aminocarboxylic acid is 0.1 to 10 in the liquid alkaline detergent composition.
% By weight. If the amount is less than 0.1% by weight, the effect of assisting the stabilizing action is small, and if it exceeds 10% by weight, the stabilizing action is improved but the viscosity is increased. Specific examples of aminocarboxylic acids include ethylenediaminetetraacetic acid and nitrilotriacetic acid. This component can be used alone or
Used in combination of more than one species.

In the present invention, a polar group is contained in one molecule in an amount of from 1 to 5;
The aromatic compound having one or more is a benzene derivative, a naphthalene derivative or an anthracene derivative.

According to the present invention, the fact that the aromatic compound having 1 to 5 polar groups is a derivative of benzene, naphthalene or anthracene makes it possible to uniformly disperse detergent components such as surfactants and alcohols. Is preferred.

Examples of the benzene derivative include phthalic acid, isophthalic acid, terephthalic acid, sulfanilic acid, trimellitic acid, trimesic acid, aminobenzoic acid, benzoic acid, benzenesulfonic acid, and aniline. 3-naphthalenedicarboxylic acid, 2,6
-Naphthalenedicarboxylic acid, 1,5-naphthalenedisulfonic acid, 2,6-naphthalenedisulfonic acid, 2,7-naphthalenedisulfonic acid, 2-naphthol-6-sulfonic acid, 1,3,6-naphthalenetrisulfonic acid, , 5-
Examples include naphthalenediamine, 2,6-dihydroxynaphthalene, a formalin condensate of β-naphthalenesulfonic acid, naphthalenesulfonic acid, and naphthalenecarboxylic acid, and anthracene derivatives include anthracenecarboxylic acid and anthracenesulfonic acid. When the compound is an acid, it includes a salt thereof.

Further, the present invention is characterized in that the aromatic compound is a compound having one polar group in one molecule.

According to the present invention, aromatic compounds having one polar group are particularly preferred due to the overall physical properties of the composition.

Examples of the aromatic compound having one polar group include benzoic acid, benzenesulfonic acid, aniline, naphthalenesulfonic acid, naphthalenecarboxylic acid, anthracenecarboxylic acid, and anthracenesulfonic acid. Contains salt.

The present invention is further characterized in that the composition further comprises at least one of a higher alcohol, a surfactant and a chelating agent.

According to the present invention, components such as a surfactant, a chelating agent, and an alcohol can be further added to the liquid alkaline detergent composition in order to enhance the detergency and the defoaming property.

The surfactant is a component for improving the detergency, and nonionic surfactants, anionic surfactants, amphoteric surfactants, and cationic surfactants can be used. Two or more surfactants may be used in combination.

The chelating agent is a component which enhances the detergency of both the surfactant and the surfactant as a cleaning aid, and examples thereof include a hydroxycarboxylate and a hydroxysulfonate. Two or more chelating agents may be used in combination.

Alcohol is a foam-suppressing component for suppressing foaming, and a straight-chain or branched-chain higher alcohol is used. Two or more alcohols may be used in combination.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the examples.

(Example 1) 30 parts by weight of sodium hydroxide were added to 59.7 parts by weight of water and dissolved, and 0.3 parts by weight of sodium polyacrylate having an average molecular weight of 20,000 and 3 parts by weight of ethylenediaminetetraacetic acid were added to this solution. Parts by weight, 3 parts by weight of isostearyl alcohol, 1 part by weight of sodium gluconate, and 2 parts by weight of benzoic acid are added and mixed with a stirrer to obtain a uniform solution. The foaming properties were examined and the results are shown in Table 1.

(Examples 2 to 16) The following chemicals were mixed in the same proportions as in Example 1 in the proportions shown in Tables 1 and 2 to obtain uniform solutions, and the stability, viscosity and washing of these solutions sex,
The foam suppressing properties were examined, and the results are shown in Tables 1 and 2.

Alkali agent A-1: t-sodium hydroxide Organic compound having one polar group B-1: benzoic acid B-2: benzenesulfonic acid B-3: naphthalenecarboxylic acid B-4: propionic acid polyacrylic acid Or a salt thereof C-1: sodium polyacrylate average molecular weight 50
00 C-2: sodium polyacrylate average molecular weight 20,000 C-3: sodium polyacrylate average molecular weight 10
10,000 aminocarboxylic acids or salts thereof D-1: ethylenediaminetetraacetic acid D-2: nitrilotriacetic acid surfactant E-1: polyoxyethylene nonylphenyl ether (10 mol) E-2: polyoxyethylene (10 mol) poly Oxypropylene (10 mol) lauryl ether E-3: Polyoxyethylene (10 mol) lauryl ether Alcohol F-1: Tridecanol F-2: Isostearyl alcohol F-3: 2-Ethylhexyl alcohol Chelating agent G-1: Gluconic acid sodium

[0031]

[Table 1]

[0032]

[Table 2]

(Comparative Examples 1 to 8) The above-mentioned chemicals were mixed in the mixing ratio shown in Table 3 in the same manner as in Example 1 to obtain uniform solutions, and the stability, viscosity, detergency, and suppression of these solutions were reduced. The foamability was examined, and the results are shown in Table 3.

[0034]

[Table 3]

The methods for evaluating stability, viscosity, detergency, and foam control are as follows. (1) Stability Evaluation Method The adjusted liquid alkaline detergent composition was stored at 30 ° C. in a standing state, and the separated state of various components in the detergent was visually judged and evaluated according to the following criteria. ○: stable for 3 days or more △: stable for 1 day or more ×: separated within 1 day

(2) Evaluation method of viscosity The adjusted liquid alkaline detergent composition was kept at 20 ° C.
The viscosity was measured with a mold viscometer and evaluated according to the following criteria. ○: Less than 100 cps △: 100 cps or more, less than 500 cps ×: 500 cps or more

(3) Method of Evaluating Detergency A steel sheet 5 × 5 cm to which tallow-fat rolling oil has adhered is immersed in the adjusted diluted alkaline cleaning solution, quickly energized for electrolytic cleaning, brushed, and then washed with running water. The cleanability was evaluated from the water wetted area on the steel sheet surface after the cleaning. The conditions are shown below. Electrolytic cleaning conditions: cleaning solution temperature 70 ° C, electrolysis time 1 second (AC
0.5 sec each), current density 7 A / dm ² cleaning solution concentration: concentration of alkaline agent in cleaning agent is 2% by weight
Dilution with water so as to obtain ○: 90% or more wet area ×: less than 90% water wet area

(4) Evaluation Method of Foam Suppressing Property 0.5% by weight of tallow rolling oil was added to each washing solution, and the test solution stirred at 80 ° C. for 48 hours was placed in a 1 L measuring cylinder.
0 cc was charged, glass with a foamer (diffuser stone) was inserted, air was blown in at a flow rate of 50 L / min with an air pump, and the foam height after 5 minutes was measured. Cleaning solution concentration: diluted with water so that the concentration of the alkaline agent in the cleaning agent becomes 2% by weight. Cleaning solution temperature: 70 ° C. ○: foam height 30 mm or more and less than 150 mm △: foam height 150 mm or more and less than 300 mm ×: foam Height 300mm or more

The liquid alkaline agent plastic of the present invention is excellent in stability, detergency and foam control, has a low viscosity but lacks an organic compound having a polar group (Comparative Example 1), polyacrylic acid or a polyacrylic acid or the like. One lacking a salt (Comparative Example 2), one lacking an aminocarboxylic acid or a salt thereof (Comparative Example 3) and one lacking two of them (for example, polyacrylic acid or a salt thereof and an aminocarboxylic acid or a salt thereof) Example 3)
Have poor stability or high viscosity. Those in which the mixing ratio of these drugs is outside the range of Claim 2 (Comparative Examples 5 to 5)
8) is inferior in stability and high in viscosity.

[0040]

As described above, the liquid alkaline detergent composition according to the present invention comprises an alkaline agent, an organic compound having 1 to 5 polar groups, polyacrylic acid or a salt thereof, aminocarboxylic acid or a salt thereof. As a result, it is excellent in stability, detergency and defoaming property and has a low viscosity, so that it is suitably used in a cleaning line for steel or the like that uses a large amount of a detergent.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C11D 3:26 3:30 3:33 3:34) (C11D 7/60 7:06 7:22 7:32 7:34) (72) Inventor Takehiko Deda Asahi Chemical Industry Co., Ltd. 4-1-2-4 Shigino Nishi, Joto-ku, Osaka City, Osaka Prefecture

Claims (5)

[Claims] 1. An alkaline agent having 1 to 5 polar groups per molecule.
A liquid alkaline cleaning composition comprising an aliphatic compound or an aromatic compound, polyacrylic acid or a salt thereof, and an aminocarboxylic acid or a salt thereof. 2. The method according to claim 1, wherein the alkali agent is 10 to 35 based on Na ₂ O.
% By weight, 1 to 10% by weight of an aliphatic or aromatic compound having 1 to 5 polar groups in one molecule, 0.1 to 10% by weight of polyacrylic acid or a salt thereof, and aminocarboxylic acid or a salt thereof. A liquid alkaline detergent composition comprising 0.1 to 10% by weight of a salt. 3. The liquid alkaline cleaning composition according to claim 1, wherein the aromatic compound having 1 to 5 polar groups in one molecule is a benzene derivative, a naphthalene derivative or an anthracene derivative. . 4. The compound according to claim 1, wherein the aromatic compound is a compound having one polar group in one molecule.
The liquid alkaline cleaning composition according to any one of the above. 5. The liquid alkaline cleaning composition according to claim 1, further comprising one or more of a higher alcohol, a surfactant, and a chelating agent.