JPS5914517B2 - liquid cleaning composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid detergent composition with excellent storage stability.

General neutral liquid cleaning compositions usually contain 1 to 20 wt% of surfactant hydrodrops or solubilizers.
Contains a range of urea.

However, this type of liquid detergent composition loses its pH when stored for a long time or at relatively high temperatures.
This usually results in an increase in H, and this is believed to be due to the gradual decomposition of urea in the liquid detergent composition during storage, producing ammonia. Decomposition of urea in a neutral liquid cleaning composition is not preferred because it not only causes the generation of ammonia odor but also causes deterioration of the cold resistance of the cleaning composition. 10 As a method of suppressing the decomposition of urea in an aqueous solution and preventing its pH from increasing, a method of adding an ammonium salt such as ammonium chloride or ammonium sulfate is known as shown in Japanese Patent Publication No. 11010/1983.

It is also known that alkanolamines function as urea decomposition inhibitors. However, as is clear from the Examples described later, these decomposition inhibition effects are insufficient and cannot completely suppress the pH increase caused by the decomposition of urea. 20 Austrian Patent No. 237,625 teaches the use of neutral amino acids as urea decomposition inhibitors.

However, neutral amino acids alone cannot sufficiently suppress the decomposition of urea. By the way, when we prepared a normal neutral liquid detergent composition containing a neutral amino acid as a urea decomposition inhibitor and examined the change in pH over time, we found that the neutral amino acid was present at the beginning of the storage period. Although it was possible to suppress the increase in pH, it was observed that the pH increased significantly after that. 30 Additionally, Austrian Patent No. 214462 proposes the use of a urea-HCHO complex to stabilize solid urea, but this complex has an aldehyde odor and
It cannot be blended into the actual liquid cleaning agent 35 because it tends to form a resinous substance.

Therefore, although the present invention contains urea as a hydrodrop or solubilizing agent, it does not cause decomposition of urea over a long period of time, and therefore the pH value at the time of preparation is low. The present invention provides a liquid cleaning composition that does not substantially rise over a long period of time.

According to the knowledge obtained by the present inventors, known decomposition inhibitors, which are not very effective in inhibiting urea decomposition when used alone, can be used in specific combinations, specifically ammonium compounds or alkanols. When amines and amino acids are used in combination, the decomposition of urea in liquid detergents can be almost completely prevented for a long period of time.

It was also confirmed that the amino acids in this case are not limited to neutral amino acids, but also basic amino acids. The liquid cleaning composition according to the present invention was developed based on the above findings, and its compositional characteristics are as follows:
5 to 40 wt% surfactant, 1 to 20 wt% urea,
0.1 ammonium compound or alkanolamine
~5 wt%, neutral amino acids or basic amino acids 0.
The content is 1 to 5 wt%. In the liquid detergent composition of the present invention, as the surfactant component, any surfactant commonly blended in conventional liquid detergents can be used.

As the ammonium compound, ammonium chloride, ammonium sulfate, ammonium nitrate, ammonium phosphate, ammonium borate, ammonium acetate, ammonium oxalate, ammonium tartrate, etc. can be used, and as the alkanolamine, monoethanolamine, diethanolamine, triethanolamine, etc. can be used. etc. can be used. Further, as neutral amino acids, glycine, valine, inleucine, etc. can be used, and as basic amino acids, histidine, etc. can be used. In order to achieve the objectives aimed at by the present invention, the amount of ammonium compound or alkanolamine in the liquid cleaning composition should be at least 0.1 wt.
Similarly, the total amount of neutral or basic amino acids must be at least 0.1wt.
Must be expressed as %.

However, in any case, the addition of 5 wt % or more must be avoided, since it not only significantly increases the viscosity of the liquid detergent composition but also deteriorates its low-temperature stability. As mentioned above, it is known that the ammonium compound or alkanolamine used in the present invention and the neutral amino acid or basic amino acid each have the effect of suppressing the decomposition of urea. When used together with a neutral amino acid or a basic amino acid, contrary to the expectations of those skilled in the art,
It exhibits a synergistic urea decomposition inhibitory effect that overwhelmingly exceeds the sum of the individual urea decomposition inhibitory effects.

Therefore, even if the liquid detergent composition according to the present invention is stored at a relatively high temperature, it can almost completely suppress the increase in pH caused by the decomposition of urea over a long period of time. In addition, each component that functions as a urea decomposition inhibitor in the present invention improves the detergency of the liquid detergent composition,
It does not impair transparency, low-temperature stability, color tone, etc., but rather has the secondary effect of improving foaming performance. Therefore, the present invention provides a liquid cleaning composition that is free from ammonia odor and has high commercial value. Next, the structure and effects of the present invention will be explained in more detail by showing comparative examples and examples.

Comparative Example A liquid detergent composition having the following composition was prepared, and this was
The temperature was maintained at 0°C and the change in pH over time was measured.

The results are shown in Table 1. As is clear from Table 1, when ammonium chloride, triethanolamine, and glycine are used alone as urea decomposition inhibitors, even the most effective one can only suppress the pH increase for about 10 days. , thereafter, the pH increases rapidly.

>! ? Example
A liquid detergent composition was prepared according to the composition of the comparative example except that ammonium chloride and glycine were used together as decomposition inhibitors of urea, and the change in pH over time at 50° C. was measured.

The results are shown in Table 2. Table 2 shows that ammonium chloride and glycine exert a synergistic effect to almost completely suppress the increase in pH of the liquid cleaning composition over time.

Example 2 It has the following composition, and the pH at the time of preparation is 7.
A liquid cleaning composition having a pH value of 0 was prepared, and after being maintained at a temperature of 50°C for 20 days, its pH was measured.

The results are shown in Table 3. Example 3 Liquid cleaning composition A. having the composition shown in Table 4 and having a pH of 7.0 at the time of preparation. B was prepared, and the foaming power, detergency, and low-temperature stability of each cleaning composition were evaluated.

The results are shown in Table 5. As is clear from Table 5, the urea decomposition inhibitor of the present invention can not only suppress the pH increase of the liquid detergent composition, but also impair the detergency and low-temperature stability of the liquid detergent composition. In fact, it has the effect of improving foaming power.

Example 4 A liquid cleaning composition having the following composition was prepared so that the pH at the time of preparation was 7.0, and its viscosity was measured.
In addition, low-temperature stability was evaluated.

The results are shown in Table 6. In addition, the PH value and low temperature stability are as follows:
Evaluation was made according to footnotes (Note-1) and (-4) of Table 5.
Table 6 shows that if the amount of one of the urea decomposition inhibitors used in combination in the present invention is 0.1 wt% or less, the pH increase cannot be suppressed, and if the amount of one of the urea decomposition inhibitors is 5 wt% or more. This indicates that the viscosity increases significantly and the low temperature stability is also impaired.

Example 5 The liquid cleaning compositions A and B prepared in Example 3 were stored for 30 days at different storage temperatures, and then the PH value of each composition was measured.

The results are shown in Table 7. As is clear from Table 7, the liquid detergent composition of the present invention hardly causes a pH increase even when stored at a relatively high temperature; however, when the storage temperature is around room temperature, urea Decomposition is almost completely prevented and the pH at the time of preparation can be maintained for a long time.

Claims (1)

[Claims] 1 5 to 40 wt% of surfactant, 1 to 20 wt% of urea
%, and further contains 0.1 to 5 wt% of an ammonium compound or alkanolamine, and 0.1 to 5 wt% of a neutral amino acid or basic amino acid. 2. The liquid cleaning composition according to claim 1, wherein the liquid cleaning composition contains ammonium chloride as the ammonium compound and glycine as the neutral amino acid. 3. The liquid detergent composition according to claim 1, wherein the liquid detergent composition contains triethanolamine as the alkanolamine and glycine as the neutral amino acid.