JPH0554065B2 - - Google Patents

Description

[Detailed description of the invention]

This invention detects the amount of copper ions in cooling water, etc. as a difference in the amount of precipitate, and compares this with a standard sample of the amount of sediment, thereby easily measuring the degree of deterioration of cooling water, etc. This relates to a method of determination. This invention was developed specifically to easily test the deterioration state of cooling water for internal combustion engines, and can similarly be applied to determining the degree of deterioration of various cooling fluids used for other purposes. Currently, the degree of deterioration of cooling water for internal combustion engines is determined by measuring the amount of dissolved metals and the content of rust inhibitors using analytical equipment, and the specific gravity, refractive index, etc. are also measured to control the concentration. There is. However, although the measurement of dissolved metal content and rust preventive content measurement using analytical instruments is accurate and suitable for determining the degree of deterioration of cooling water,
These methods require expensive analytical equipment and a lot of man-hours, and it is not possible to easily determine the deterioration of cooling water on site. On the other hand, when measuring specific gravity or refractive index, it is possible to measure the concentration of antifreeze used in cooling water, but it is impossible to measure the concentration of rust inhibitors used in cooling water, which are used at concentrations as low as 5%. It is. Furthermore, with these concentration measurements, it is not possible to measure the amount of rust preventive agent contained in the cooling water, and it is impossible to prevent troubles due to deterioration of the rust preventive agent. Nowadays, in response to the demands of the times for higher engine speeds, lighter vehicle bodies, and energy savings, modern automobile engines are increasingly being made of aluminum alloy, slimmer, or have a radiator mechanism with a lower capacity. Furthermore, the quality of radiator solutions for cooling automobile engines is gradually improving as various additives, including antifreeze and rust preventive agents, are used together with water. The improved quality of this radiator solution has made it extremely convenient for users in that it can withstand long-term use and eliminates the troublesome work of replacing it.However, as mentioned above, the small structure of the engine itself The radiator solution is placed in a harsh environment due to the use of aluminum alloys, aluminum alloys, or faster circulation of the radiator solution by powerful pumps due to the gradual decrease in the capacity of the radiator mechanism, which inevitably leads to a decline in the functionality of the additives. Rapid deterioration of the radiator solution is unavoidable. Therefore, when using the radiator solution continuously for a long period of time without replacing it as in the past,
This may even cause the engine itself to deteriorate and cause a serious accident. Therefore, it is desired to develop a technology that can easily determine the deterioration of radiator solution.
As mentioned above, a satisfactory determination technique has not yet been developed. In view of the above-mentioned circumstances, the inventor of this invention focused on the fact that copper ions are the metal ions that greatly affect the functional deterioration of the radiator solution. This invention was completed by discovering that it is possible to determine the degree of deterioration of a radiator solution. Note that in addition to copper ions, aluminum ions, iron ions, lead ions, and zinc ions may exist in the radiator solution, but copper ions, which have the least tendency to ionize, have the strongest influence on other metals. It has been found that quantitative measurement of copper ions is sufficient for determining the deterioration of radiator solutions. Hereinafter, details of the present invention will be explained with reference to drawings showing one embodiment. As shown in FIGS. 1 and 2, in the simple method for determining deterioration of cooling water for an internal combustion engine according to the present invention, it is necessary to prepare a reagent and a reference chart. That is,
Reagent 1 is placed in bottle 2, test tube 3, and reference chart 4.
For example, it is stored in a case 5 and prepared. Reagent 1 contains a substance that reacts with copper ions in the cooling water to purify a water-insoluble salt; such substances include benzotriazole, methylbenzotriazole, meltcaptobenzothiazole,
Indazole, benzimidazole, etc. can react with copper ions to form a precipitate that is insoluble in water. As shown in FIG. 2, the reference chart 4 represents a large number of precipitate amounts that vary in stages depending on the amount of copper ions, and uses photographs or the like. Next, for the test, draw out the solution to be tested (radiator solution) and put it in test tube 3, and add reagent 1 to it.
Add. Reagents are not only directly added to the test solution and dissolved to react with copper ions, but also caustic soda, caustic potassium, monomethylamine, dimethylamine, trimethylamine, monomethylamine,
Ethylenediamine, diethylenetriamine, monoethanolamine, diethanolamine, triethanolamone, monoisopropanolamine,
The reagent is made into an aqueous solution by reacting with a water-soluble alkali such as diisopropanolamine, cyclohexylamine, or triisopropanolamine, and a buffer is used in combination to suppress the pH change of the aqueous solution and increase stability. To improve the stability of the aqueous reagent solution, add methyl acetone, methyl alcohol, ethyl alcohol, or propyl to the reagent aqueous solution to improve the stability of the reagent aqueous solution. Alcohol, isopropyl alcohol, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, glycerin, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether, diethylene glycol monomethyl ether, triethylene Add a water-soluble solvent such as glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, or acetone to react with copper ions, and visually check the amount of precipitate produced using a chart based on the amount of precipitate. Compare and contrast, find a matching amount of precipitate, detect the amount of copper ions, and determine the degree of deterioration of the cooling water. Next, three types of sedimentation amount standard charts [A], [B], and [C] are shown as examples of sedimentation amount standard charts prepared in advance. The reagents and samples used here are as follows. Reagent (1) Heat and dissolve 119 g of benzotriazole in ethylene glycol to make 1. Reagent (2) Heat and dissolve 133 g of methylbenzotriazole in ethylene glycol to make 1. Reagent (3) Dissolve 189 g of mercaptobenzothiazole soda in water to make 1. Reagent (4) Dissolve 39.2 g of copper sulfate (CuSO ₄ , 5H ₂ O) in water to make 1 (Cu 10000 ppm) Sample (5) (Reference cooling water) Ethylene glycol 30.0 g Water 67.0 89% phosphoric acid 0.5 g Stir and dissolve 1.5 parts of triethanolamine and 1.0 parts of sodium benzoate.

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[Table] In addition to ethylene glycol, reagents (1), (2), and (3) may be dissolved in water-soluble solvents such as methyl alcohol, ethyl alcohol, and isopropyl alcohol. It can also be dissolved in water containing an alkali such as ethanolamine, diethanolamine, triethanolamine, etc. From the above precipitation amount standard chart, it can be seen that there is a correlation between the amount of copper ions and the amount of precipitation. Next, we will show an example of the results when applied to the deterioration determination of radiator fluid (actual vehicle fluid) in an actual vehicle.

【table】

[Table] Collect 100 ml of the test liquid into each 100 ml measuring cylinder with a stopper, and add 1 ml of reagent (3) to each cylinder.
ml of the solution was added, shaken vigorously for 10 seconds, and allowed to stand for 15 minutes.The amount of precipitate was then compared and contrasted with the precipitate amount reference chart [C]. As a result, the larger the amount of copper ions, the larger the amount of precipitation, which almost coincided with the amount of precipitation standard chart [C]. As described above, this invention allows the amount of eluted copper ions to be detected based on the amount of precipitated chelate compound produced by the reaction of copper ions with a reagent. Determination of the deterioration of various types of industrial water, including its condition, is extremely simple and can be performed accurately by any person without requiring any skill. In addition, even if the amount of copper ions is not detected using a chart, if precipitation is formed and the presence of copper ions becomes clear, at least the copper-based rust inhibitor in the cooling water will be consumed and it will be known that it cannot be used as is. It can be implemented effectively. In addition, since the reagent can be freely handled in a solution state or solidified into tablets, it is easy to handle and can be used in various industrial water test and quantitative methods, especially for determining deterioration by quantifying copper ions in cooling water for internal combustion engines. It is effective for Furthermore, reagents, chemicals, instruments, etc. can be integrated into a single case along with instructions for commercialization, making it easy to conduct deterioration determinations by quantifying copper ions in cooling water for internal combustion engines and other industrial water at each site. have an effect. In particular, by using the precipitation reagent as a specific constituent rather than a single substance, it is possible to effectively clarify the amount of precipitation, make the precipitate non-suspended, make it a constant density, etc. As is clear from the above description, according to the present invention, by detecting the amount of copper ions in the coolant as a difference in the amount of precipitate and comparing this with a sample of the amount of precipitate, it is possible to easily determine the level of the coolant in the internal combustion engine. can be determined.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing reagents, and FIG. 2 is an explanatory diagram showing a precipitate amount standard chart. 1... Reagent, 2... Reagent bottle, 3... Test tube, 4
...Sedimentation amount standard chart, 5...case.

Claims (1)

[Claims] 1 At least one of benzotriazole, methylbenzotriazole, mercaptobenzothiazole, indazole, and benzimidazole containing a substance that reacts with copper ions to produce water-insoluble salts, a water-soluble alkali such as caustic soda, a buffer, and iron. A precipitation reagent consisting of an ion sequestering agent that forms a complex compound with ions or zinc ions and a stabilizer such as methylacetone is added to the cooling water, and the deterioration of the cooling water is determined based on the formation of the salt. A simple method for determining the deterioration of cooling water, etc. for internal combustion engines.