JPS6313480B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a liquid cleaning composition that has excellent cleaning properties, metal elution prevention properties, and temporary rust prevention properties. Degreasing and cleaning the surfaces of metals and plastics is not only essential as a pretreatment for plating or painting, but the completion of this process is an important factor that controls the quality of the desired plating or painting. be. By the way, the hard surface cleaning agents used for the above purpose today, especially cleaning agents for metal cleaning, generally contain alkalis such as caustic soda and caustic potash, alkali metal salts such as carbonates, silicates, and phosphates, sulfates, etc. It consists of an "inorganic builder group" consisting of neutral metal salts and acidic metal salts, and a "surfactant group" represented by nonionic surfactants. "Organic builder group" consisting of oxycarboxylic acids or their alkali metal salts, EDTA (ethylenediaminedotetraacetic acid),
It consists of a "chelating agent group" consisting of aminopolycarboxylic acids such as NTA (nitrilotriacetic acid) or their alkali metal salts and amine salts, antifoaming agents, etc., and their shapes are granular, powder, and some plate-like. It is available on the market as a powder containing In general, alkaline cleaning is an efficient and effective cleaning method for metal cleaning, but metal elution phenomenon is observed especially when cleaning aluminum etc.
Careful cleaning management is required. Furthermore, after cleaning iron, etc., it may be left in the air for a short period of time, which can cause problems due to rust depending on the conditions. In addition, powdered alkaline cleaning agents require dissolution work to obtain the cleaning liquid, and the impact on the human body and the environment caused by the powder that is scattered during work is enormous. ○B It is inefficient as it requires equipment such as a dissolution tank and a long dissolution time. ○C Cleaning liquid management, which affects cleaning performance, is also less efficient than liquid cleaning agents. It has disadvantages such as, and is not preferable. Therefore, liquid cleaning agents have been proposed in order to solve the above-mentioned problems with powder cleaning agents, and also to provide advantages such as ease of measurement during work, possibility of pipe transportation, and simple storage. There is. However, in known liquid cleaning agents, salting out occurs due to a large amount of coexisting alkali builders, and as a result, it is difficult to avoid phase separation or precipitation of surfactants and antifoaming or antifoaming components. Can not. Of course, the performance of a cleaning agent whose components are made non-uniform in this manner is naturally degraded, and this has been a major hindrance to the practical application of liquid cleaning agents. Incidentally, as a means for preventing the above-mentioned phase separation and precipitation, for example, the following method has been considered. ○B Use a low concentration alkaline cleaning agent. ○B Separate the alkali builder part (liquid or powder may be used) and surfactant part and adjust the cleaning solution in a pre-washing tank. ○C A method of raising the cloud point of a surfactant or adding an anionic surfactant in an alkaline liquid. ○D A method of adding components having a hydrotrobi effect (water solubility increasing effect) such as relatively low molecular weight carboxylic acid salts, aromatic sulfonate salts, lower aliphatic alcohols, urea, amines, hydrocarbons, etc. However, the low-concentration alkaline cleaning agent shown in ○B has little utility even if it is liquefied due to transportation cost scale, etc., and the separation type shown in ○B cannot be said to be an improvement in terms of workability. The means for improving the cloud point (C) is not effective because it causes problems due to foaming due to the addition of anions and a decrease in cleanability. ○ D is relatively effective, but the effect is not sufficient to obtain a highly concentrated liquid detergent, and even if a highly concentrated liquid detergent is obtained, a large amount of additive is required that affects the cleaning effect, making it impractical. isn't it. On the other hand, it is known that to prevent the elution of metals, especially aluminum, in alkaline cleaning solutions, it is possible to adjust the pH value with an "inorganic builder" or to compose an alkaline cleaning agent based on a silicate builder. ,
If the pH value is 10 or more, which is effective for cleaning, the elution of aluminum other than silicic acid will be significant, and even with cleaning agents composed of silicate, careful attention must be paid to the management of the cleaning liquid and cleaning conditions. Furthermore, the addition of nitrites is known to be effective for short-term rust prevention during the processing of iron, etc., but it is known to be undesirable due to its effects on the human body, and the addition of phosphates and inorganic builders do not have sufficient effects. . The present invention solves the above-mentioned drawbacks of the known liquid cleaning agents, and is characterized by its "inorganic builder group" (A) such as alkalis, alkali metal salts, and neutral/acidic metal salts. , a "surfactant group" represented by nonionic surfactants (B), an oxycarboxylic acid-based "organic builder" (C), and an aminopolycarboxylic acid-based "chelating agent" (D). A "solubilizing agent" (E) consisting of an aromatic sulfonic acid and its alkali metal salt, and a "solubilizing agent" (E) consisting of an aromatic carboxylic acid and its alkali metal salt or amine salt are added to the cleaning agent component for cleaning surfaces, especially metals. "Organic rust preventive dissolution aid"
(F) and "water" (G) are blended as essential components, and if desired, an antifoaming agent (H) and/or a compound (I) selected from known solubilizing agents are blended. Be at the point. That is, the present invention includes: A: 0 to 80% by weight of one or more inorganic builders selected from alkali, alkali metal salts, neutral salts, and acidic salts; B: Nonionic surfactant, anionic surfactant. and 0.1 to 50% by weight of one or more surfactants selected from amphoteric surfactants; C: oxycarboxylic acids of gluconic acid, citric acid, glycolic acid, malic acid, tartaric acid, and lactic acid, or their One or more organic builders selected from alkali metal salts,
2 to 60% by weight; D: 1 to 40% by weight of one or more chelating agents selected from aminopolycarboxylic acids such as ethylenediaminetetraacetic acid and nitrilotriacetic acid, or their alkali metal salts or amine salts; E: 1 to 30% by weight of one or more solubilizing agents selected from aromatic sulfonic acids such as toluenesulfonic acid, xylenesulfonic acid, or naphthalenesulfonic acid, or alkali metal salts thereof; F: benzoic acid, cinnamon 2 to 50% by weight of one or more organic rust preventive dissolution aids selected from aromatic carboxylic acids, their alkali metal salts, or amine salts; 1.5 to 4 times the total of components F and H to I; is included as an essential component, and optionally as an additional component: H: one or more antifoaming agents; and/or I: lower alcohol A liquid cleaning composition for metals, characterized in that it contains a compound selected from known solubilizers consisting of urea, amines, and hydrocarbons. In the above composition, one or more inorganic builders selected from alkali, alkali metal salts, neutral salts, and acidic salts as component A are usually used as solid components excluding water (hereinafter each component B to F). The same applies to the following: 0 to 80% by weight (the same applies hereinafter). If this component exceeds 80%, it becomes difficult to obtain a homogeneous liquid cleaning agent. Next, component B, one or more surfactants selected from nonionic surfactants, anionic surfactants, and amphoteric surfactants, is blended in a proportion of 0.1 to 50%. If the amount is less than 0.1%, the cleaning effect will be poor, and if it exceeds 50%, it will be difficult to obtain a uniform liquid detergent. In addition, one or more organic builders selected from oxycarboxylic acids such as gluconic acid, citric acid, glycolic acid, malic acid, tartaric acid, and lactic acid or their alkali metal salts, which are component C, have a content of 2 to 60%. Mixed in proportions. If the blending ratio is less than 2%, the cleaning effect will be reduced and it will be difficult to obtain a uniform liquid cleaning agent.
Moreover, if it exceeds 60%, the cleaning effect will decrease. Furthermore, one or more chelating agents selected from aminopolycarboxylic acids such as ethylenediaminetetraacetic acid and nitrilotriacetic acid, or their alkali metal salts or amine salts, which are component D,
It is blended at a ratio of 1 to 40%. Even if the blending ratio is less than 1% or more than 40%, the cleaning effect will decrease. Also E
One or more aromatic sulfonic acids selected from aromatic sulfonic acids such as toluene sulfonic acid, xylene sulfonic acid, or naphthalene sulfonic acid, or their alkali metal salts, which are components, are blended at a ratio of 1 to 30%. be done. Contains 1%
If it is less than 30%, it will be difficult to obtain a homogeneous liquid cleaning agent, and if it exceeds 30%, the cleaning effect will decrease. Finally, component F, one or more aromatic carboxylic acids selected from aromatic carboxylic acids such as benzoic acid and cinnamic acid, or their alkali metal salts or amine salts, has a blending ratio of 2 to 50%. If it is less than 2%, it is difficult to obtain a homogeneous liquid cleaning agent, and it is also difficult to obtain elution prevention and rust prevention effects. If it exceeds 50%, the cleaning effect will decrease. Components H and I may be added in small amounts as necessary. Water (G component) is other A to F and H to I
It is added at a rate of 1.5 to 4 times the total amount of ingredients. Through the steps described above, it is possible to obtain a liquid cleaning composition that is homogeneous and stable in liquid form, has an excellent cleaning effect, and has excellent metal elution prevention effects and temporary rust prevention effects. The modes of carrying out the invention and the effects of the invention will be explained below with reference to Examples, but the examples are, of course, for illustrative purposes only and are not intended to limit the spirit of the invention.
In particular, it is needless to say that the act of manufacturing or selling dry matter (dry matter) obtained by removing water from the composition of the present invention constitutes an obvious incomplete embodiment. EXAMPLE Blend Invention cleaning agent and control cleaning agent were trial-produced according to the composition table shown in Table 1.

[Table] Stability of the products of the present invention The detergents of the present invention and the control detergent prepared according to the above table were left in constant temperature chambers at 5°C and 40°C for 30 days, respectively, and the appearance of each sample was observed with the naked eye. . The results are shown in Table 2 below. Cleaning test A JIS G 3141 (SPCC-SB) rolled steel plate was used as a test piece, 20 holes with an inner diameter of 5 mmφ were drilled in it, bent into a “concave” shape, and then heated with mobil oil.
After immersion in an oil bath consisting of 90 parts and 10 parts of soybean oil,
Tests were conducted after heating at 100°C for 8 hours. This test piece was immersed for 60 seconds in a cleaning agent containing 30 g of each active ingredient and adjusted to 60°C. Furthermore, spray cleaning was carried out for 60 seconds under conditions of spray pressure: 4 kg/cm ² , and then spray washing was carried out for 60 seconds. The results were calculated according to the formula below. Cleanability (%) = Amount of oil to be cleaned / Amount of attached oil x 10
0 The results are shown in Table-2.

[Table] [] Aluminum elution (erosion) test JIS H 4000 (A-1050P) Aluminum plate was impregnated with contaminated oil consisting of 80 parts of Mobil oil and 10 parts of soybean oil, and the paper was layered alternately at 100℃ for 10 kg/cm. The samples were subjected to a pressure test of ² and treated for 3 hours. ●Cleaning test Inventive cleaner 1 and control cleaners 1 to 4,
Each test piece was adjusted to 90° C. with a pure content of 20 g/solution, then immersed and washed for 60 minutes, and the washability was determined by the gravimetric method as in the example. ● Elution (erosion) test Elution (erosion) g/m ² is calculated from the initial test piece weight and the weight reduction of the test piece that was further cleaned with petroleum benzine ethyl alcohol after the cleaning test. The results are shown in Table 3.

[Table] [] Temporary rust prevention test JIS G 3141 (SPCC-B) mild steel plate JIS R
A test piece that has been uniformly polished with 6252 (abrasive paper) No. 240 is coated with 100 g/m ² of lithium grease, cleaned, and subjected to a temporary rust prevention test. ●Cleaning test Inventive cleaner 2 and control cleaners 5 to 8,
Each test piece was adjusted to 95℃ with a pure content of 80g/solution and then immersed and cleaned for 30 minutes. Effect example 2
Improve cleaning performance using the same gravimetric method. ●Temporary rust prevention test After cleaning, leave the test piece in 60℃ x 100% humidity for 60 minutes and judge the rust (%) with the naked eye. The results are shown in Table 4.

【table】

Claims (1)

[Claims] 1 A: 0 to 80% by weight of one or more inorganic builders selected from alkali, alkali metal salts, neutral salts, and acidic salts; B: Nonionic surfactant, anionic interface 0.1 to 50% by weight of one or more surfactants selected from active agents and amphoteric surfactants; C: oxycarboxylic acid of gluconic acid, citric acid, glycolic acid, malic acid, tartaric acid, and lactic acid; One or more organic builders selected from those alkali metal salts,
2 to 60% by weight; D: 1 to 40% by weight of one or more chelating agents selected from aminopolycarboxylic acids such as ethylenediaminetetraacetic acid and nitrilotriacetic acid, or their alkali metal salts or amine salts; E: 1 to 30% by weight of one or more solubilizing agents selected from aromatic sulfonic acids such as toluene sulfonic acid, xylene sulfonic acid, or naphthalene sulfonic acid, or alkali metal salts thereof; F: benzoic acid, cinnamon 2 to 50% by weight of one or more organic rust preventive dissolution aids selected from aromatic carboxylic acids, their alkali metal salts, or amine salts; 1.5 to 4 times the total of components F and H to I; is included as an essential component, and optionally as an additional component: H: one or more antifoaming agents; and/or I: lower alcohol A liquid cleaning composition for metals, characterized in that it contains a compound selected from known solubilizers consisting of urea, amines, and hydrocarbons.