JPH04136100A - Liquid detergent composition for outer panel of vehicle - Google Patents

Abstract

PURPOSE:To obtain a liquid detergent composition for the outer panel of a vehicle which is improved in detergency and workability, can remove effectively brown dirt derived from iron rust, and permits automatic cleaning by dispersing and dissolving a specific water-soluble solvent, a surfactant, an organic acid and a water-soluble polysaccharide in water. CONSTITUTION:2-40wt.% water-soluble solvent comprising a compound represented by formula I and/or II (wherein R represents H or 1-4C alkyl; n represents 1 to 2); 0.1-5wt.% surfactant; 2-14wt.% organic acid selected from oxalic acid, citric acid, sulfamic acid, succinic acid, malic acid, tartaric acid and gluconic acid; and 0.01 to 0.5wt.% water-soluble polysaccharide (preferably xanthan gum) are dispersed and dissolved in water to obtain a liquid detergent composition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid detergent composition for vehicle exterior panels used for cleaning vehicle exterior panels such as railways and automobiles. More specifically, the present invention relates to a liquid detergent composition that exhibits excellent cleaning properties and can improve workability, particularly in cleaning the outer panels of railway vehicles.

[Conventional technology]

Conventionally, various detergents have been used to clean the outer panels of vehicles such as railways and automobiles. Such detergents can be acidic, weakly alkaline, or neutral, but acidic detergents with strong detergency are often used especially for cleaning railway cars in order to sufficiently remove firmly attached iron rust. It has been. The acidic detergent commonly used is a powder containing oxalic acid and a surfactant as its main ingredients.
Further, in order to further improve the cleaning power, a water-soluble solvent may be used in combination.

[Problem to be solved by the invention]

However, the conventional acidic detergents described above are applied to soiled surfaces containing iron rust and left for about 10 to 30 minutes to dissolve iron rust and remove stains; In such cases, there is a problem in that the retention property on the vertical surface is weak and it is necessary to reapply many times.

Furthermore, this acidic detergent cannot remove stains that have turned brown due to penetration of iron rust into the painted surface of the exterior panel. Therefore, there is a problem in that in order to maintain the light painted appearance of the outer panels, it is necessary to repaint them at intervals of about 3 to 5 years.

Furthermore, this acidic detergent is a powdered detergent that contains oxalic acid, which is a harmful substance, so it must be diluted with water before use, and if a water-soluble solvent is used together, a separate solvent must be prepared. There are disadvantages in handling and work that must be done. Therefore, there is a problem in that it is difficult to automate washing using an automatic car wash machine or the like.

As mentioned above, the reality is that no liquid acidic detergent has been found that can remove stains including iron rust and has excellent handling and workability.

The present invention solves the above-mentioned problems, and provides a vehicle that does not have the above-mentioned problems, has excellent washability, workability, and ability to remove brown stains caused by iron rust, and facilitates the automation of washing. An object of the present invention is to provide a liquid detergent composition for exterior panels.

[Means to solve the problem]

The conventional acidic detergents have the above-mentioned problems because they cannot be made into liquid detergents due to the low solubility of cydiacid in water, which is one of their main components. For this reason, the present inventors investigated the effects of each component on the detergency, retention, and solubility of oxalic acid in water with respect to acidic detergent compositions, and as a result of research on liquefaction, we found that organic acids, The inventors discovered that a composition in which a water-soluble solvent, a surfactant, and a water-soluble polysaccharide are dispersed and dissolved in water exhibits excellent cleaning properties and workability, leading to the completion of the present invention.

That is, the liquid detergent composition according to the first invention contains an organic acid,
A liquid detergent composition in which a water-soluble solvent, a surfactant, and a water-soluble polysaccharide represented by at least one of the above general formulas (I) and (II) are dispersed and dissolved in water, Based on the entire composition, the organic acid is 2 to 14% by weight (hereinafter referred to as "%"), the water-soluble solvent is 2 to 40%,
It is characterized by containing 0.1 to 5% of a surfactant and 0.01 to 0.5% of a water-soluble polysaccharide.

The above-mentioned "organic acid" exhibits the effect of dissolving and removing iron rust stains contained in oil, soot, etc. that adhere to the exterior panels of vehicles, and iron rust stains that have penetrated into painted surfaces. Specifically, as shown in the second invention, one or more compounds selected from oxalic acid, citric acid, sulfamic acid, succinic acid, nicotinic acid, tartaric acid, and gluconic acid are used. is appropriate.

Further, the reason why the content of this organic acid is set in the range of 2 to 14% is that if it is less than 2%, the ability to dissolve iron rust stains is weak, and if it exceeds 14%, a stable liquid detergent cannot be obtained.

The above-mentioned "water-soluble solvent" mainly exhibits the same effect as the above-mentioned organic acid. Among these, "-mathematical formula (■)"
Those represented by: ethylene glycol, ethylene glycol monomethyl ether (methyl cellosolve)
, Ethylene Glycol Monoethyl Ether (Cellosolve), Ethylene Glycol Monobutyl Ether (Butyl Cellosolf), Ethylene Glycol Monopropyl Ether 7, Diethylene Glycol, Diethylene Glycol Monomethyl Ether (Methyl Calpitol), Diethylene Glycol Monoethyl Ether (Calpitol), Diethylene Glycol Monobutyl Ether (Butyl Carpitol) diethylene glycol monopropyl ether, etc. can be used.

In addition, those represented by "-formula (■)" include propylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol monopropyl ether, dipropylene glycol, dipropylene Glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, dipropylene glycol monopropyl ether, etc. can be used. still,
The value of n in each of the general formulas (I) and (II) is 1 to 2. This is because if it exceeds 3, it will have an adverse effect on the coating, which is not preferable.

In addition, the content of this water-soluble solvent is set in the range of 2 to 40% because if it is less than 2%, the cleaning power will be insufficient, and if it exceeds 40%, it will be difficult to obtain a stable liquid detergent, and the color of the painted surface will change. Otherwise, problems such as fading may occur. In addition, these water-soluble solvents represented by "general formula (I)" and "general formula (U)" may be used alone or in combination, or may be used in combination with the same general formula. 2 of the compound represented by
It may be a mixture of more than one species.

The above-mentioned "surfactant" is a component for efficiently cleaning oil, soot, and other stains, and commonly used surfactants can be used. For example, fatty acid soaps, naphthenic acid soaps, long chain alcohol sulfate salts,
Polyoxyethylene alkylphenyl sulfate salt,
Anionic surfactants such as fatty acid polyhydric alcohol sulfate ester salt, fatty acid monoalkanolamide sulfate ester salt, alkanesulfonate, α-olefin sulfonate, α-sulfo fatty acid salt, etc. Examples include nonionic surfactants such as ethylene alkylphenyl ether, polyoxyethylene-polyoxybrobylene glycol, polyoxyethylene difatty acid ester, ethylene glycol monofatty acid ester, and ethylene glycol monofatty acid monoethanolamine.

In addition, the reason why the content of this surfactant is set in the range of 0.1 to 5% is that if it is less than 0.1%, the cleaning power is insufficient,
%, the rinsing time after washing becomes longer.

The above-mentioned "water-soluble polysaccharide" is a component that exhibits effects on thickening action, retention action, and stability of detergent compositions, and it is appropriate to use xanthan gum as shown in the third invention. This is because xanthan gum exhibits a stable thickening effect even in acidic solutions.

In addition, the content of this water-soluble polysaccharide is set in the range of 0.01 to 0.05% because if it is less than 0.01, the viscosity will be low and satisfactory retention will not be obtained, whereas if it exceeds 0.05%, the This is because work efficiency decreases and the rinsing time becomes longer.

The method for producing the liquid detergent composition of the present invention is not particularly limited, but for example, after adding a water-soluble polysaccharide to water and dispersing it uniformly, adding cyanuric acid, a water-soluble solvent, a surfactant, etc. It can be easily manufactured by adding, mixing, and dissolving the agent. Furthermore, in addition to the above-mentioned essential components, antifoaming agents, corrosion inhibitors, preservatives, and the like can be appropriately used in the detergent composition of the present invention.

Further, as a modified example of the present invention, objects other than vehicles such as ships, electrical appliances, and buildings can be cleaned.

〔Example〕

The present invention will be specifically explained below using Examples.

In the Examples and Comparative Examples below, "%" means % by weight unless otherwise specified.

Table 1 shows the compositions of the detergent compositions according to Examples 1 to 4 and Comparative Examples 1 to 4. However, in the same table, the anionic surfactant refers to sodium alkyldiphenyldisulfonate. In addition, "Softanol 90" (trade name, manufactured by Nippon Shokubai Kagaku ■) is used as a nonionic surfactant, and rKELZANJ (trade name, manufactured by Kelco Co., Ltd.) is used as xanthan gum.
were used respectively.

In order to clarify the performance of the detergent composition according to the present invention,
Performance tests were conducted on each composition in Table 1. below,
For each test item, write down the test method, evaluation method, etc.
The test results are shown in Table 2.

(This line is a blank space.) (1) Cleanability ■ Test piece The test piece was a zinc phosphate treated steel plate (0.8X70X
150mm) with Phthal M resin paint “Cream No. 10”
(manufactured by Dainippon Toyo Co., Ltd.) and dried at room temperature for two weeks or more.

■Staining conditions The above test piece was covered with tissue paper, and iron powder of 100 mesh or less was sprinkled uniformly to give a concentration of 1 mg/cm, and then 5 w/v% salt water was added to the sample to give a concentration of about 0.
, 3 ml/cm''.Then, after being left at 20° C. and 60% RH for 24 hours, the tissue paper was peeled off, washed with water, and dried.

(2) Sample liquid Each detergent composition shown in Table 1 was diluted 20 times with water and used as a sample liquid.

(2) Cleaning method A sample solution was applied to each test piece subjected to the staining conditions described above, stood vertically, and left at 40° C. and 18% RH for 3 minutes, followed by washing with water and drying.

■Evaluation method According to JIS Z8729 (object color display method), the b* value of each test piece was measured using a color computer to determine the cleaning rate.The cleaning rate (%) was calculated using the following formula. .

Cleaning rate (%) = [(b* value after soiling - b* value after cleaning)/(b* value after soiling
*Value - b* value before staining) IXloo (2) Retention ■Test piece A test piece similar to that used in the evaluation of cleanability was used.

■Sample solution Among the detergent compositions shown in Table 1, for liquid detergents, the undiluted solution is
The powdered detergent was diluted 20 times with water and used as a sample solution.

(2) Evaluation method A sample solution was sufficiently applied to each test piece, and the remaining state of the solution after being left at 40° C. and 18% RH for 100 minutes was visually evaluated.

The evaluations shown in Table 2 are as follows.

O: Liquid remains on the entire applied area, ×: Liquid has completely drained (3) Place the storage-stable detergent composition in a glass container with a lid, and store at 0°C for 2 hours.
The condition of the liquid after being left for i was visually evaluated. Furthermore, the second
The evaluations shown in the table are as follows.

○: No abnormality, ×: Precipitate generation (4) Effect on coating ■ Test piece A test piece similar to that used in the evaluation of washability was used.

(2) The same sample solution as used in the evaluation of sample solution retention was used.

■Test method: Pour 0.2 mj of sample liquid onto each test piece! /cm2 drop at 25℃
The condition of the test piece was visually evaluated after being left at 60% RH for 30 minutes. The evaluations shown in Table 2 are as follows.

◯: No abnormality, ×: Significant discoloration or fading.Evaluating the results of each performance test above, the results are as follows.

Regarding cleaning properties and retention properties, Comparative Examples 3 and 4 are particularly inferior to other compositions. Since the sample solutions related to Comparative Examples 3 and 4 do not contain water-soluble polysaccharides, first,
This results in poor retention. This is because if the retention property is poor, the sample solution will not be able to sufficiently adhere to the vertically erected test piece, resulting in poor cleaning performance.

Furthermore, in both comparative examples, one of the reasons for the poor cleaning performance was that a water-soluble solvent, which plays a central role in the cleaning action together with the organic acid, was not included.

Regarding storage stability, a precipitate was generated in Comparative Example I. This is thought to be because the amount of organic acid (oxalic acid) contained in the sample solution according to Comparative Example 1 was too large.

As for the influence on the coating, an adverse effect was observed in Comparative Example 2. This is thought to be because the amount of water-soluble solvent contained in the sample solution of Comparative Example 2 was too large.

In contrast, Examples 1 to 4 showed good results in all test items. Therefore, as shown in this example, by using the essential components of the present invention in a well-balanced manner, a detergent composition with excellent detergency, workability, etc. can be obtained.

It should be noted that the present invention is not limited to those shown in the above-mentioned specific embodiments, and may be modified in various ways within the scope of the present invention depending on the purpose and use. In other words, the size, cross-sectional shape, material, installation condition, etc. of the object to be cleaned (test piece), etc.
There is no particular question.

〔Effect of the invention〕

As explained above, the detergent composition of the present invention has excellent cleaning properties for stains containing iron rust.

Moreover, since it is a liquid, it is easy to handle and has excellent workability, and furthermore, it can be used in automatic car wash machines, so cleaning work can be streamlined.

Claims (3)

[Claims] (1) A vehicle outer panel in which an organic acid, a water-soluble solvent represented by at least one of the following general formulas (I) and (II), a surfactant, and a water-soluble polysaccharide are dispersed and dissolved in water. 2 to 14% by weight of the organic acid based on the entire composition;
2 to 40% by weight of the water-soluble solvent and 0% of the surfactant.
．． 1-5% by weight, and 0.01-0.5% water-soluble polysaccharide
A liquid detergent composition for vehicle exterior panels, characterized in that it contains % by weight. RO(CH_2CH_2O)_nH(I) ▲Mathematical formulas, chemical formulas, tables, etc.▼(II) (However, R is H or an alkyl group having 1 to 4 carbon atoms, n
is 1-2. ) (2) The liquid for vehicle exterior panels according to claim 1, wherein the organic acid is one or more compounds selected from oxalic acid, citric acid, sulfamic acid, succinic acid, malic acid, tartaric acid, and gluconic acid. Detergent composition. (3) The water-soluble polysaccharide is xanthan gum (Xanth
2. The liquid detergent composition for vehicle exterior panels according to claim 1, wherein the liquid detergent composition is