JPS61188500A - Alkaline detergent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alkaline cleaning agent, and particularly to a low-foaming alkaline cleaning agent suitable as a hard surface cleaning agent such as a cleaning agent for automatic dishwashers.

Automatic dishwashers, which wash large quantities of kitchen utensils such as tableware and cooking utensils, are widely used mainly in cafeteria facilities. In such a washing machine, a cleaning agent is sprayed onto the tableware and the like to be washed, and the cleaning agent is recycled and used.

Therefore, cleaning agents are required to have low foaming properties in addition to cleaning power. When the cleaning agent foams, the cleaning agent overflows from the cleaning tank or the pump runs idle, making the cleaning machine inoperable. Therefore, in the past, surfactants could not be incorporated into cleaning agents, and cleaning agents mainly consisting of alkaline agents and chelating agents were used.

However, such cleaning agents do not necessarily have sufficient cleaning power, and spot stains on glassware such as pots have been a problem.

Spraying a finishing agent called a rinsing agent after cleaning has also been practiced, but this does not provide a fundamental solution.

Furthermore, for the long-term stable operation of washing machines, it is necessary to prevent the formation of scum, and since disinfectants are used in conjunction with tableware washing, stability against oxidizing agents is required. The development of a comprehensively superior cleaning agent has been awaited.

OBJECTS OF THE INVENTION An object of the present invention is to provide a surfactant-containing alkaline detergent that does not cause spot stains, has excellent detergency, has low foaming properties, and is suitable for automatic washing machines for single-dish dishes.

Composition of the invention The alkaline cleaning agent of the present invention has the following (a).

It is characterized by containing components (b) and (c).

(a) A dicarboxylic acid surfactant consisting of one or more compounds represented by the following general formulas (I), (II) or (nI) (in the above formula, R is a linear or branched chain carbon number 6 with
~10 alkyl or alkenyl groups, R,,
R.

R4, R, represents an alkylene group having 1 to 4 carbon atoms which may have a branched chain, and M represents an alkali metal. ) (b) Chelating agent (c) Alkaline agent The present invention will be described in more detail below.

The dicarboxylic acid surfactant as component (a) is an alkyl (or alkenyl) represented by the above general formula (I).
Succinic acid''; alkali metal salt, dialkali metal salt of N-acyliminodiacetic acid represented by general formula (n), general formula (I
At least one N-alkyl (or alkenyl) iminodiacetic acid dialkali metal salt represented by II) is used. In the above general formula, R1 must be in the range of 6 to 10. If this value is less than 5, the cleaning power will be insufficient and spot stains will occur, while if this value is 11 or more, foaming will be so strong that it will be difficult to operate the cleaning device, spot stains will occur, and the cleaning power will also be reduced. Also, R,,R,,R
When the number of carbon atoms in 4,R, is 5 or more, foaming becomes intense;
Spot stains occur and the cleaning power is poor. M is an alkali metal salt, preferably sodium or potassium.

The chelating agent for component (b) is not particularly limited and may be the same as conventional ones, such as polyacrylate, polymaleate, ethylenediaminetetraacetate,
Examples include gluconate and nitrilotriacetate.

Among these, it is preferable to use polyacrylates and polymaleates in combination with component (a), a dicarboxylic acid surfactant. Ethylenediaminetetraacetate, gluconate, nitrilotriacetate, etc. are often used because they have the ability to capture Ca and Mg ions that cause scale, but they have a dispersing effect on food stains and scale, It is not necessarily sufficient in terms of crystal formation or growth inhibiting effect. On the other hand, polyacrylates and polymaleates have excellent soil dispersion effects and scale suppression effects, but their chelating power for Ca and Mg is weak, so carboxylic acid-based compounds that form scum with these chelating agents alone If a surfactant is used in combination, the surfactant tends to generate scum and recontaminate the items to be cleaned and the cleaning machine. On the other hand, the specific dicarboxylic acid surfactant of the present invention does not generate scum even when combined with polyacrylates and polymaleates, and has excellent cleaning performance and long-term stability of washing machines. Are better. Furthermore, disinfectants such as sodium hypochlorite are often used to clean kitchen utensils such as tableware.

Since cleaning agents are recycled in automatic cleaning equipment, sodium hypochlorite gets mixed into the cleaning agent and decomposes ethylenediaminetetraacetate (EDTA), gluconate, nitrilotriacetate, etc. Therefore, E.D.T.
Even if a chelate system is formed by combining A, etc. with a polyacrylate, EDTA, etc. will be deactivated during use, resulting in the generation of scum. If (a) the dicarboxylic acid surfactant of the present invention is combined with a polyacrylate and a polymaleate, no scum will be generated, and
The chelating agent is not decomposed by the disinfectant and the desired cleaning ability is not lost.

Examples of polyacrylates include homopolymers of acrylic acid and copolymers with other vinyl monomers such as methacrylic acid. Preferred salts are alkali metal salts such as sodium and potassium. Also, the molecular weight is 4
,000 to about 80,000 is appropriate.

Examples of polymaleic acid salts include homopolymers of maleic acid and copolymers with other monomers such as ethylene, propylene, butylene, acrylic acid, and methacrylic acid. The salt is preferably an alkali metal salt such as sodium or potassium, and the molecular weight is 1,000 to 1,000.
Approximately 7,000 is appropriate.

As the alkaline agent for component (c), the same ones as conventional ones can be used, such as sodium hydroxide, potassium hydroxide, sodium metasilicate, sodium tripolyphosphate,
Examples include sodium pyrophosphate and sodium carbonate.

The blending amounts of components (a), (b), and (c) are as follows.

11jji1 [Anal master 1] [1 (a) component = 5 to 30 parts by weight 10 to 20 parts by weight (b
) component: 0.1 to 20 parts by weight 0.5 to 10 parts by weight (
Q) Component = 5 to 94 parts by weight ' 5 to 94 parts by weight The alkaline cleaning agent of the present invention can be in the form of either a liquid or a solid such as a powder.

In the case of liquid cleaning agents, the solid content concentration is preferably 45% or less. Moreover, the alkaline cleaning agent of the present invention can also contain additives such as sodium sulfate and disinfectants as optional components. Further, although other surfactants may be contained, it is preferable from the viewpoint of detergency that substantially no other surfactants such as foaming alkylbenzene sulfonate are contained.

By blending a specific dicarboxylic acid derivative as a surfactant component, the alkaline cleaning agent of the present invention has extremely low foaming and does not cause spot stains on the glass surface.
It also has excellent cleaning power. Moreover, this surfactant has excellent alkali resistance and can be stably stored for a long time as a liquid cleaning agent. The cleaning agent of the present invention is particularly suitable as a cleaning agent for automatic washing machines, especially as a cleaning agent for high-pressure washing of automatic dishwashers and the like.

Example A liquid detergent having the composition shown in Table 1 (wt%, balance: water) was prepared and supplied to an automatic dishwasher at a working concentration of 0.2%. The washing machine sprays high-pressure cleaning liquid onto glass cups and porcelain flat plates to clean them, and the cleaning liquid is circulated by a pump.As shown below, bubbles, spot stains, and cleaning power are evaluated and the results are evaluated. It is shown in Table 1.

(I) Foaming It was evaluated as follows.

0...There are almost no bubbles on the liquid surface 0...There are bubbles on the liquid surface, but it does not interfere with high-pressure cleaning Δ...Bubbles overflow X...The motor rotates at medium speed and cleans Unable to operate the machine ゛(2) Spot stains The glass cup was evenly stained with milk.

It was dried for 3-4 hours at room temperature and then washed.

Spot stains were visually judged based on the following criteria, and the average of the five samples was taken.

5 points...4 points with no spots...3 points with one spot...2 points with 2-3 spots...1 point with dirt removed but many spots... ...Stains remain (3) Cleaning power A mixture of Kayu and raw egg was applied in an amount of 5 to 8 grams per flat plate, dried at room temperature for 30 minutes to 1 hour, and then washed.

Remaining stains were detected by iosostarch reaction and evaluated based on the area ratio of non-colored areas as follows.

5 points...100-80% 4 points...80-60% 3 points...60-40% 2 points...40-20% 1 point...20% or less When 5 wt % of sodium hypochlorite was further added to the liquid cleaning agents No. 5 and 7.8 and continuous cleaning was performed, no change was observed in the cleaning ability except in Example 4, and no scum was generated. The washing machine was able to operate stably. The cleaning agent of Example 4 showed a decrease in cleaning ability, resulting in spot stains and poor cleaning performance.

(Margin below)

Claims (1)

[Claims] 2. (a) The following general formula (I), (II) or (III)
A dicarboxylic acid surfactant consisting of one or more of the compounds represented by: ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(II) ▲Mathematical formulas, There are chemical formulas, tables, etc. ▼ (II) (In the above formula, R_1 represents a linear or branched alkyl group or alkenyl group having 6 to 10 carbon atoms, and R_
2, R_3, R_4, and R_5 represent an alkylene group having 1 to 4 carbon atoms which may have a branched chain, and M represents an alkali metal. ) An alkaline cleaning agent characterized by containing (b) a chelating agent and (c) an alkaline agent.