JP2008024878A - Liquid detergent composition for metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid detergent composition for metal excellent in initial detergency, exerting excellent detergency even contaminated with processing oil or the like in continuously cleaning industrial metal products or parts. <P>SOLUTION: The liquid detergent composition for metal is characterized by formulating following components (A)-(E) in a respective ratio. The component (A) 1-50 wt.% of a nonionic surfactant comprising (a1) a compound represented by general formula (1) and (a2) a compound represented by general formula (2), in a mass ratio of ä(a1)/(a2)}=1/10-20/1, (B) 0.1-6.0 wt.% of a silicate compound, (C) 0.1-6.0 wt.% of ethylene diamine tetraacetic acid and/or its alkali metal salt, (D) 0.1-6.0 wt.% of oxycarboxylic acid and/or its alkali metal salt, and (E) 32.0-98.7 wt.% of water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid detergent composition for metals. More specifically, it excels in the removal performance of grease, processing oil, chips, fingerprints, dust, etc., rinsing performance, etc. adhering to the surface of industrial products and parts made of metal such as ferrous metals and non-ferrous metals, When cleaning metal industrial parts continuously, excellent initial cleaning power, excellent cleaning power even when contaminated with processing oil, etc., and excellent stability of liquid cleaning agent The present invention relates to a liquid detergent composition.

  Conventionally, as detergents for cleaning metal industrial products / parts such as ferrous metal industrial products / parts, non-ferrous metal industrial products / parts, water-based detergents using water as a medium, typically alkaline detergents, In addition, solvent-based cleaning agents represented by 1,1,1-trichloroethane are used. Alkaline detergents include (1) nonionic surfactants typified by polyoxyethylene alkylphenyl ether, anionic surfactants typified by sodium alkylbenzene sulfonate, (2) sodium carbonate, silicic acid Alkaline inorganic compounds such as sodium, sodium borate, sodium phosphate, sodium hydroxide, (3) chelating agents such as EDTA, NTA, gluconate, (4) prevention of benzotriazoles, amines, alkanolamines, etc. A rusting agent or the like is appropriately blended. Various blending compositions have been proposed according to the object to be cleaned, the type of metal, and the degree of contamination (see Non-Patent Document 1, Non-Patent Document 2, etc.). However, since these alkaline cleaners are inferior to chlorine-containing solvent-based cleaners such as 1,1,1-trichloroethane in terms of degreasing power and penetrating power, they are practically used in the field of articles having a simple structure, The main field is that the amount of residual oil after washing is not so important.

  On the other hand, chlorine-containing solvent-based detergents such as 1,1,1-trichloroethane are excellent in degreasing power and penetrating power, and can be applied to all types of degreasing such as cutting oil, drawing oil, and press oil. Used for cleaning precision parts that require high cleanliness. However, in recent years, problems such as groundwater contamination, air pollution, and ozone layer destruction due to chlorine-containing solvent-based cleaning agents have been pointed out, and in the industry, water-based media using water as a cleaning agent is an alternative to chlorine-containing solvent-based cleaning agents. Attention is focused on cleaning agents (hereinafter simply referred to as water-based cleaning agents).

However, conventional water-based cleaning agents are inferior in degreasing and penetrating power compared to chlorine-containing solvent-based cleaning agents, and in particular, cutting oil, drawing oil, high-pressure press oil, etc. adhere to narrow gaps and details. It is difficult to use in a field where the amount of residual oil on the surface of metal industrial products and parts is a problem. To increase the degreasing power of water-based cleaning agents, there is a technique to increase the pH of the cleaning liquid by increasing the amount of alkaline inorganic compound, but it is difficult to make a stable liquid cleaning agent. Considering the impact on the environment and safety for workers, it is not a preferable method. As a technique for making a stable aqueous detergent, there is a technique of blending sodium aromatic carboxylate as described in Patent Document 1, but paratertiary butyl benzoate used as a representative of sodium aromatic carboxylate. Sodium acid has a problem that it is highly toxic to human kidney and liver.
Recommended work, published by Jinjin Shoinsha, "Industrial detergent and cleaning technology", pages 221 to 223, Recommended work, published by Industrial Technology Service Center, "Latest cleaning technology overview", page 422 Japanese Patent Publication No. 63-13480

Under such circumstances, the present inventors have intensively studied to provide a metal-based water-based cleaning agent that has solved the above-mentioned drawbacks, and as a result, have completed the present invention. That is, the object of the present invention is as follows.
1. To provide a liquid detergent composition for metal that is excellent in the removal performance and rinsing performance of grease, processing oil, chips, fingerprints, dust, etc. adhering to the surface of metal industrial products and parts.
2. To provide a liquid detergent composition for metal that is excellent in initial cleaning power and exhibits excellent cleaning power even when dirt such as processing oil is mixed when continuously cleaning industrial products and parts made of metal.
3. To provide a metal liquid detergent composition having excellent stability of a liquid detergent.
4). To provide a liquid detergent composition for metals that does not contain toxic substances and does not adversely affect human health.

In order to solve the above problems, in the present invention, the following components (A) to (E) are blended in the following proportions (100% by weight as a whole), respectively, A liquid detergent composition is provided.
Component (A): The (a1) compound represented by the following general formula (1) and the (a2) compound represented by the general formula (2) are in a mass ratio {(a1) / ( a2)} 1 to 50% by weight of a nonionic surfactant in which 1/10 to 20/1
(B) component: 0.1-6.0 weight% of silicate compounds,
(C) component: 0.1 to 6.0% by weight of ethylenediaminetetraacetic acid and / or alkali metal salt thereof,
(D) component: 0.1-6.0 weight% of oxycarboxylic acid and / or its alkali metal salt,
(E) component: Water 32.0-98.7 weight%.

The present invention is as described in detail below, has the following particularly advantageous effects, and its industrial utility value is extremely large.
1. The liquid detergent composition for metal according to the present invention is excellent in the removal performance and rinsing performance of grease, processing oil, chips, fingerprints, dust, and the like adhering to the surface of metal industrial products and parts.
2. The liquid detergent composition for metal according to the present invention has excellent initial cleaning power when continuously cleaning metal industrial products and parts, and exhibits excellent cleaning power even if dirt such as processing oil enters. To do.
3. The metal liquid detergent composition according to the present invention is excellent in the stability of a liquid detergent.
4). Since the liquid detergent composition for metals according to the present invention does not contain a toxic substance such as para-tertiary butyl benzoate, it does not adversely affect human health.

  Hereinafter, the present invention will be described in detail. The liquid detergent composition for metals according to the present invention is required to contain the components (A) to (E) in a specific ratio. In the present invention, the component (A) is a compound having a large number of ethylene oxide additions represented by the general formula (1) (a1) and a small number of ethylene oxide additions represented by the general formula (2) (a2 ) Compound is a nonionic surfactant in which the mass ratio {(a1) / (a2)} of the two is 1/10 to 20/1. By combining these two types of nonionic surfactants having different addition numbers of ethylene oxide, the initial cleaning power and cleaning durability of the metal liquid cleaning composition can be improved at the same time.

When the carbon number of R ¹ in the general formula (1) is less than 10, the metal liquid detergent composition is hardly uniform, and when the carbon number exceeds 15, the metal liquid detergent composition is initially washed. Both strength and washing persistence are difficult to improve, and neither is preferable. Specific examples of R ¹ include decyl group (C ₁₀ ), undecyl group (C ₁₁ ), dodecyl group (C ₁₂ ), tridecyl group (C ₁₃ ), tetradecyl group (C ₁₄ ), pentadecyl group (C ₁₅ ), and the like. Examples include alkenyl groups such as alkyl groups, decenyl groups (C ₁₀ ), undecenyl groups (C ₁₁ ), dodecenyl groups (C ₁₂ ), tridecenyl groups (C ₁₃ ), tetradecenyl groups (C ₁₄ ), and pentadecenyl groups (C ₁₅ ). It is done. A particularly preferred range of the carbon number of R ¹ is 10-15. When the integer m of the compound (a1) represented by the general formula (1) is less than 7, it is difficult to form a uniform liquid detergent composition, and when m exceeds 20, the initial washing power of the liquid detergent composition And cleaning durability does not improve. (A1) The compound may be one kind or a mixture of two or more kinds. M in the general formula (1) may be a mixture of a plurality of different m. In the case of a mixture, the average value of a plurality of compounds may be in the range of 7-20. A particularly preferable range of the integer m is 7 to 12.

When the carbon number of R ² in the general formula (2) is less than 10, the metal liquid detergent composition is difficult to be uniform, and when the carbon number exceeds 15, the metal liquid detergent composition is initially washed. Both strength and washing persistence are difficult to improve, and neither is preferable. Specific examples of R ² are the same as R ¹ in the general formula (1). When the integer n of the compound (a2) represented by the general formula (2) is less than 3, it is difficult to form a uniform metal liquid detergent composition, and when the integer n exceeds 6, the metal liquid detergent composition The initial detergency and durability of the object are not improved. The compound (a2) may be a single type or a mixture of two or more types. N in the general formula (2) may be a mixture of a plurality of different n. In the case of a mixture, the average value of a plurality of compounds may be in the range of 3-6. A particularly preferable range of the integer n is 3 to 5.

  According to the experiment of the present inventor, even when the compound (a1) represented by the general formula (1) is combined with the component (B) to the component (E), the initial cleaning power of the liquid detergent composition for metals And cleaning persistence did not improve. Further, even when the compound (a2) represented by the general formula (2) is combined with the component (B) to the component (E), it is difficult to form a uniform liquid detergent composition for metal and the detergency is not improved. . Therefore, the mass ratio {(a1) / (a2)} of the compound (a1) represented by the general formula (1) and the compound (a2) represented by the general formula (2) is expressed as follows. Combined with 1/10 to 20/1 and combined with component (B) or component (E), the liquid detergent composition for metal becomes a uniform and stable liquid, with excellent initial detergency and continuous cleaning. It turns out that power is demonstrated. A preferable range of the mass ratio {(a1) / (a2)} is 1/5 to 15/1.

Examples of the compounds (a1) and (a2) that are easily available include the following. The (a1) compound and the (a2) compound differ only in the number of ethylene oxide additions and share the same molecular chain skeleton. Polyoxyethylene decyl ether (C ₁₀ ), polyoxyethylene isodecyl ether (C ₁₀ ), polyoxyethylene lauryl ether (C ₁₂ ), polyoxyethylene tridecyl ether (C ₁₃ ), polyoxyethylene isotridecyl ether ( C _13), polyoxyethylene coconut alcohol ether _(mixture of _C 12 ~C _14), mixtures of polyoxyethylene synthetic alcohol ether _(C 12 _{~C 13),} mixtures of polyoxyethylene synthetic alcohol ether _(C 14 _{-C 15} ), Polyoxyethylene synthetic alcohol ether (mixture of C _{12 to} C ₁₅ ), polyoxyethylene synthetic secondary alcohol ether (mixture of C _{11 to} C ₁₅ ), polyoxyethylene synthetic alcohol ether (C _{12 to} C ₁₄ ) Mixture).

  According to the inventor's experiment, the proportion of the component (A) in the metal liquid detergent composition according to the present invention is 1 to 50% by weight (100% by weight of the total essential components. Hereinafter, the same meaning). )). When the component (A) is less than 1% by weight, the detergency of the metal liquid detergent composition is not excellent, and when it exceeds 50% by weight, it becomes difficult to obtain a uniform metal liquid detergent composition. Absent. A preferred ratio of the component (A) in the metal liquid detergent composition is 5 to 30% by weight.

  The component (B) (silicate compound) keeps the liquid detergent composition for metal according to the present invention alkaline, contributes to improving the detergency, and exerts an effect of inhibiting corrosion on metal. Specific examples of the component (B) include sodium metasilicate, sodium orthosilicate, potassium metasilicate, and potassium orthosilicate. The proportion of the component (B) in the liquid detergent composition for metal according to the present invention is selected in the range of 0.1 to 6.0% by weight. When the component (B) is less than 0.1% by weight, the initial cleaning power and cleaning endurance of the metal liquid detergent composition are inferior. When the component exceeds 6.0% by weight, a uniform metal liquid detergent composition is obtained. It is difficult to obtain and neither is preferable. Component (B) may be a single type or a mixture of two or more types. A preferred range for the component (B) is 0.5 to 4.0% by weight.

  The component (C) (ethylenediaminetetraacetic acid and / or its alkali metal salt) exhibits a chelating effect and contributes to the improvement of the detergency of the metal liquid detergent composition according to the present invention. Specific examples of the component (C) include ethylenediaminetetraacetic acid, ethylenediaminetetraacetic acid monosodium, ethylenediaminetetraacetic acid disodium, ethylenediamine, trisodium tetraacetate, ethylenediaminetetraacetic acid tetrasodium, ethylenediaminetetraacetic acid monopotassium, ethylenediaminetetraacetic acid dipotassium , Ethylenediaminetetraacetic acid tripotassium, ethylenediaminetetraacetic acid tetrapotassium and the like. The proportion of the component (C) in the liquid detergent composition for metal according to the present invention is selected in the range of 0.1 to 6.0% by weight. If the component (C) is less than 0.1% by weight, the initial cleaning power and cleaning durability of the metal liquid cleaning composition are inferior, and if it exceeds 6.0% by weight, it becomes difficult to obtain a uniform liquid cleaning agent. Neither is preferred. Component (C) may be a single type or a mixture of two or more types. A preferred range for the component (C) is 0.5 to 4.0% by weight.

  The component (D) (oxycarboxylic acid and / or alkali metal salt thereof) contributes to the improvement of the initial cleaning power and cleaning durability of the metal liquid detergent composition according to the present invention together with the component (C). Specific examples of the component (D) include gluconic acid, sodium gluconate, potassium gluconate, citric acid, sodium citrate, potassium citrate, heptonic acid, sodium heptonic acid, potassium heptonic acid, malic acid, sodium malate, Examples include potassium malate, lactic acid, sodium lactate, potassium lactate, glycolic acid, sodium glycolate, potassium glycolate, tartaric acid, sodium tartrate, potassium tartrate and the like. Among these, gluconic acid, sodium gluconate, potassium gluconate, heptonic acid, sodium heptonic acid, potassium heptonic acid, citric acid, sodium citrate, potassium citrate and the like are preferable. The proportion of the component (D) in the liquid detergent composition for metal according to the present invention is selected in the range of 0.1 to 6.0% by weight. When the component (D) is less than 0.1% by weight, the initial cleaning power and the cleaning durability are inferior, and when it exceeds 6.0% by weight, it becomes difficult to obtain a uniform liquid cleaning agent. Component (D) may be a single type or a mixture of two or more types. The preferred range of component (D) is 0.5 to 4.0% by weight.

  The component (E) is water and the components (A) to (D) are dispersed. The proportion of the component (E) in the metal liquid detergent composition according to the present invention is selected in the amount of 32.0 to 98.7% by weight. When the component (E) is less than 32.0, the dispersibility is insufficient, and a liquid detergent composition for metal excellent in stability cannot be obtained. When the component exceeds 98.7% by weight, the active ingredient is insufficient. Since the cleaning power and the cleaning durability are poor, neither is preferable.

  The liquid detergent composition for metal according to the present invention essentially comprises the above components (A) to (E), but as an additional component, as long as the object of the present invention is not impaired, a metal corrosion inhibitor { (F) component}, antifoaming agent {(G) component}, solubilizer {(H) component}, fragrance and / or colorant {(I) component} and the like can be blended.

  Component (F) (corrosion inhibitor for metal) is a metal (aluminum, aluminum alloy, copper, brass, phosphor bronze, copper alloy, etc.) since the metal liquid cleaning composition according to the present invention is alkaline. ) May be corroded, and the corrosion of the metal can be suppressed by adding the component (F). Specific examples of the component (F) include aromatic carboxylic acids such as benzoic acid and cinnamic acid, metal salts and amine salts thereof, alkylamines, dicyclohexyl nitrite, 2-mercaptothiazole, 1,2,3-benzo And triazole. The proportion of the component (F) in the liquid detergent composition for metal according to the present invention is 0.01 to 0.5% by weight (the total of essential components and additional components is 100% by weight. It is preferable to select within the range of If the component (F) is less than 0.01% by weight, the metal corrosion inhibiting effect is insufficient, and if it exceeds 0.5% by weight, the detergency of the metal liquid detergent composition is reduced. Is also not preferred.

  The component (G) (antifoaming agent) suppresses bubbles that may be generated by a cleaning method when various metal industrial products / parts are cleaned with the metal liquid cleaning composition according to the present invention. The component (G) is typically polydimethylsiloxane. The proportion of the component (G) in the metal liquid detergent composition according to the present invention is preferably selected in the range of 0.1 to 5.0% by weight. If the component (G) is less than 0.1% by weight, the defoaming effect may not be sufficient, and if it exceeds 5.0% by weight, the detergency of the metal liquid detergent composition is reduced. Is also not preferred.

  The component (H) (solubilizing agent) refers to one that fulfills the function of dissolving a uniform part when a predetermined amount of the constituent components of the liquid detergent composition for metal according to the present invention is weighed and mixed. Specific examples of the component (H) include aromatic sulfonic acids such as toluene sulfonic acid, xylene sulfonic acid, and naphthalene sulfonic acid, and alkali metal salts thereof, lower alcohols, amines such as ethanolamine, glycol ether, urea. , And hydrocarbons. The proportion of the component (H) in the metal liquid detergent composition according to the present invention is preferably selected in the range of 1.0 to 10.0% by weight. When the component (H) is less than 1.0% by weight, the function as a solubilizer cannot be exhibited, and when it exceeds 10.0% by weight, the detergency of the metal liquid detergent composition is reduced. Neither is preferred.

  Of the component (I) (fragrance and / or colorant), the fragrance suppresses the substrate odor and unpleasant odor of the metal liquid cleaning composition according to the present invention, and the colorant is the metal liquid according to the present invention. When viewing the cleaning composition, it functions to give a high-class feeling. Examples of the fragrances include citronellol, geraniol, eugenol, vanillin, decan-1-ol, allylisoamyloxyacetate, limonene and the like. Examples of the colorant include various water-soluble dyes. The proportion of the component (I) in the metal liquid detergent composition according to the present invention is preferably selected in the range of 0.01 to 1.0% by weight. When the component (I) exceeds 1.0% by weight, the cleaning power of the metal liquid detergent composition is lowered, which is not preferable.

  In order to prepare the liquid detergent composition for metal according to the present invention, a component (E) (water) is weighed and prepared in a container of 100 ml to several thousand liters, and the liquid detergent composition is constituted thereby. Weigh out a certain amount of essential components, that is, (B) component to (D) component, and if necessary, also prepare impossible components, that is, (F) component to (I) component, and add each component to water collectively Alternatively, the addition order may be changed and added to water and stirred uniformly with a stirrer. The prepared liquid detergent composition for metal according to the present invention can be stored in a container and stored until use, and the components do not separate into layers during storage, so the solid content is gelled. It has excellent storage stability.

  When the metal liquid detergent composition according to the present invention is used, the metal liquid detergent composition is used as it is, or the metal liquid detergent composition is diluted with water, and the object is a metal industrial product to be washed. -Depending on the size and shape of the parts, it can be done by immersion cleaning, spray cleaning, etc. In the case of the immersion method, the cleaning effect can be improved by applying an ultrasonic wave to the liquid cleaning agent and vibrating it.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to the example as described below.

<Details of components>
Details of the components used in the examples and comparative examples are as follows.
(A1) Compound (1) a1-1: Polyoxyethylene tridecyl ether {carbon number 13 (hereinafter referred to as C ₁₃ ; hereinafter, the numbers have the same meaning), m (ethylene oxide average added mole number) ( m has the same meaning below.) = 12}.
(2) a1-2: Polyoxyethylene tridecyl ether {C ₁₃ , m = 10}.
(3) a1-3: Polyoxyethylene tridecyl ether {C ₁₃ , m = 8}.
(4) a1-4: Polyoxyethylene tridecyl ether {C ₁₃ , m = 7}.
(5) a1-5: Polyoxyethylene synthetic alcohol ether {C _12-15 , m = 10}.
(6) a1-6: Polyoxyethylene isodecyl ether {C ₁₀ , m = 8}.
(7) a1-7: Polyoxyethylene 2-ethylhexyl ether {C ₈ , m = 8}.
(8) a1-8: Polyoxyethylene oleyl ether {C ₁₈ , m = 14}.
(9) a1-9: Polyoxyethylene lauryl ether {C ₁₂ , m = 40}.

(A2) Compound (10) a2-1: Polyoxyethylene tridecyl ether {C ₁₃ , n (average added mole number of ethylene oxide) (n is the same meaning hereinafter) = 3}.
(11) a2-2: Polyoxyethylene tridecyl ether {C ₁₃ , n = 5}.
(12) a2-3: Polyoxyethylene synthetic alcohol ether {C _12-15 , n = 3}.
(13) a2-4: Polyoxyethylene synthetic alcohol ether {C _12-15 , n = 5}.
(14) a2-5: Polyoxyethylene isodecyl ether {C ₁₀ , n = 3}.
(15) a2-6: Polyoxyethylene 2-ethylhexyl ether {C ₈ , n = 4}.
(16) a2-7: Polyoxyethylene oleyl ether {C ₁₈ , n = 5}.
(17) a2-8: Polyoxyethylene lauryl ether {C ₁₂ , n = 2}.

(18) Component B: sodium metasilicate pentahydrate (manufactured by Guangei Chemical Industry Co., Ltd.).
(19) C component: EDTA 3 sodium (manufactured by Kirest Co., Ltd., trade name: chelate C).
(20) D component: sodium gluconate (manufactured by Fuso Chemical Industries).

[Example 1 to Example 16, Comparative Example 1 to Comparative Example 15]
<Preparation of liquid detergent composition for metal>
The proportions (weights) described in Table-1 and Table-2 (Examples), Table-3 and Table-4 (Comparative Examples) so that each component constituting the metal liquid detergent composition is 300 g in total. Part). The weighed components were put into a beaker having a capacity of 500 ml, and stirred for 30 minutes at a strength of 500 times / min with a mixer (manufactured by Yamato Kagaku Co., Ltd., model: LABO STIRRE LR-41C) to obtain a metal liquid. A cleaning composition was prepared.

<Evaluation method of liquid detergent composition for metal>
(1) Initial cleaning power: First, a test piece made of SUS304 having a size of 25 mm × 80 mm × 1.0 mm was prepared. This test piece was immersed in an oil obtained by mixing grease (manufactured by Nippon Oil Co., Ltd., trade name: Multinock) and gear oil (manufactured by Nippon Oil Co., Ltd., trade name: Bonnock SP320) at a weight ratio of 6: 4. Then, oil was applied to the surface of the test piece. On the other hand, the metal liquid cleaning composition shown in Tables 1 to 4 was diluted with water to prepare a cleaning solution having a concentration of 5% by weight. The prepared cleaning liquid was immersed in the cleaning liquid according to the “detergency evaluation test” described in the synthetic detergent test method of JIS K3362, and the surface of the test piece was cleaned while stirring the cleaning liquid. The difference in weight before and after immersion of the test piece in the cleaning solution was measured, and the same test was performed using the index detergent described in JIS K3362, and the degreasing amount was compared. The test results were displayed as follows.
A: The degreasing amount of the prepared cleaning liquid in Examples and Comparative Examples exceeds 4 times that of the index detergent.
A: The degreasing amount of the prepared cleaning liquid in Examples and Comparative Examples is 3 to 4 times that of the indicator detergent.
X: The amount of degreasing of the prepared cleaning liquid in Examples and Comparative Examples is less than 3 times that of the index detergent.

(2) Washing durability: A test piece made of SUS304 having a size of 25 mm × 80 mm × 1.0 mm was prepared. This test piece was immersed in an oil obtained by mixing grease (manufactured by Nippon Oil Co., Ltd., trade name: Multinock) and gear oil (manufactured by Nippon Oil Co., Ltd., trade name: Bonnock SP320) at a weight ratio of 6: 4. Then, oil was applied to the surface of the test piece. On the other hand, the liquid detergent composition for metals shown in Table-1 to Table-4 was diluted with water to prepare a liquid having a concentration of 5% by weight. The prepared liquid was mixed with 0.1% by weight of kerosene to obtain a cleaning liquid. In accordance with the “detergency evaluation test” described in the synthetic detergent test method of JIS K3362, this test liquid was immersed in the cleaning liquid, and the surface of the test specimen was cleaned while stirring the cleaning liquid. The difference in weight before and after immersion of the test piece in the cleaning solution was measured, and the same test was performed using the index detergent described in JIS K3362, and the degreasing amount was compared. The test results were displayed as follows.
A: The degreasing amount of the prepared cleaning liquid in Examples and Comparative Examples exceeds 4 times that of the index detergent.
A: The degreasing amount of the prepared cleaning liquid in Examples and Comparative Examples is 3 to 4 times that of the indicator detergent.
X: The amount of degreasing of the prepared cleaning liquid in Examples and Comparative Examples is less than 3 times that of the index detergent.

(3) Liquid stability: The liquid detergent composition for metal shown in Table-1 to Table-4 is left in a temperature-controlled room maintained at 40 ° C. for 30 days to obtain a solid liquid detergent composition for metal. The presence or absence of separation and precipitation was visually observed. The test results were displayed as follows.
A: Separation and precipitation are not observed.
X: Separation and precipitation were observed.

From Table-1 to Table-4, the following becomes clear.
1. The liquid detergent composition for metal according to the present invention is excellent in initial cleaning power such as removal performance of grease, processing oil, chips, fingerprints, dust, etc., rinsing performance attached to the surface of metal industrial products and parts. Even if dirt such as processing oil is mixed, excellent cleaning power is exhibited (see Examples 1 to 16).
2. On the other hand, even if both the (a1) compound and the (a2) compound are included as the component A, if the mass ratio is outside the range specified in claim 1, the initial cleaning power, the cleaning maintenance power, etc. Inferior (see Comparative Example 1 and Comparative Example 2).
3. When the component (A) is less than the amount specified in claim 1 (Comparative Example 3), the initial cleaning power and cleaning maintenance power are inferior (see Comparative Example 3), and conversely, the component (A) is Claim 1. When the amount is more than the amount specified in (1), the liquid stability is poor (see Comparative Example 4).
4). When the number of carbon atoms of the a1 compound and the a2 compound is 8 and does not satisfy the requirement of claim 1, the liquid stability is inferior even if m and n satisfy the requirement of claim 1 (see Comparative Example 5).
5. In the case where the carbon number of the a1 compound and the a2 compound is 18 and does not satisfy the requirement of claim 1, even if m and n satisfy the requirement of claim 1, the initial detergency and detergency are poor (comparative example) 6).
6). Even if the carbon number of the a1 compound satisfies the requirement of claim 1, if m is out of the range of claim 1 as 40, the initial cleaning power, cleaning maintenance power, liquid stability, etc. are poor (see Comparative Example 7). . Even if the number of carbon atoms of the a2 compound satisfies the requirement of claim 1, if n is outside the range specified in claim 1 as 2, the initial cleaning power, cleaning maintenance power, liquid stability, etc. are inferior (Comparative Example 8). reference).
7). Moreover, when the component (B), the component (C), and the component (D) are outside the scope of claim 1, the initial cleaning power and the cleaning maintenance power are inferior (see Comparative Examples 9 to 12).
8). Furthermore, if any of the blending amounts of the component (B), the component (C), or the component (D) is outside the range defined in claim 1, the liquid stability is inferior (Comparative Examples 13 to Comparative Examples). 15).

  The liquid detergent composition for metal according to the present invention is a product that removes grease, processing oil, chips, fingerprints, dust, and the like attached to the surface of industrial products and parts made of metal such as ferrous metals and non-ferrous metals, Useful as a cleaning agent for rinsing.

Claims (2)

The following liquid detergent composition for metals, wherein the following components (A) to (E) are blended in the following proportions (100% by weight as a whole).
Component (A): The (a1) compound represented by the following general formula (1) and the (a2) compound represented by the general formula (2) are in a mass ratio {(a1) / ( a2)} 1 to 50% by weight of a nonionic surfactant in which 1/10 to 20/1
(B) component: 0.1-6.0 weight% of silicate compounds,
(C) component: 0.1 to 6.0% by weight of ethylenediaminetetraacetic acid and / or alkali metal salt thereof,
(D) component: 0.1-6.0 weight% of oxycarboxylic acid and / or its alkali metal salt,
(E) component: Water 32.0-98.7 weight%.

The liquid detergent composition for metals according to claim 1, further comprising at least one of the following components and the following ratio in the components (A) to (E).
(F) component: 0.01-0.5 weight% of corrosion inhibitors for metals,
(G) component: 0.1-5.0 weight% of antifoaming agents,
(H) component: 1.0-10.0 weight% of solubilizers,
(I) Component: 0.01 to 1.0% by weight of a fragrance and / or colorant.