JPH0834997A - Liquid alkaline detergent composition for washing hard surface and washing method - Google Patents

Abstract

PURPOSE:To obtain the composition excellent in detergency, also excellent in environmental compatibility with ready biodegradability, suitable for washing glass hardwares, metals, etc., by incorporating an alkali metal hydroxide as the chief ingredient with a specific aldohexose. CONSTITUTION:This composition is obtained by incorporating (A) as the chief ingredient, an alkali metal hydroxide such as sodium hydroxide with (B) as active ingredient(s), at least one kind of aldohexose among D-glucose, D-mannose and D-galactose, and in addition, pref. (C) as another active ingredient, a water- soluble metal salt such as iron chloride or sodium aluminate with the molar ratio B/C of (1:0.1) to (1:1) in terms of metal ion.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid alkaline cleaner composition for cleaning hard surfaces and a cleaning method. For more information,
The present invention relates to a liquid alkaline cleaner composition for cleaning hard surfaces and a cleaning method which are excellent in cleaning performance, easily decomposed by microorganisms and have little environmental pollution, and are particularly suitable as industrial cleaners.

[0002]

BACKGROUND ART Conventionally, for cleaning a hard surface such as a glass surface or a metal surface, an alkaline cleaner based on an alkali metal hydroxide, ethylenediaminetetraacetic acid alkali salt, gluconic acid alkali salt or sodium tripolyphosphate is typical. A detergent containing a complexed metal complex such as a condensed phosphate is used in many cases. However, the detergents containing these metal complex-forming products have advantages and disadvantages in their action and effects, and no satisfactory ones have been obtained.

For example, although ethylenediaminetetraacetic acid alkali salt (EDTA-Na) has excellent cleaning performance, it is poor in microbial degradability and therefore remains in the natural environment for a long period of time and has a problem of affecting the environment. Although gluconic acid alkali salt has good biodegradability, it has a small metal complex-forming ability and has a problem that cleaning performance is deteriorated under the condition of a solution having a high hardness. On the other hand, in the case of condensed phosphate,
In addition to its poor solubility in water, the condensed phosphate dissolved in an aqueous solution is hydrolyzed to a phosphorus compound with a low degree of condensation, which has a poor ability to form metal complexes. It is not suitable as a thing. Moreover, the detergent waste liquid containing this phosphate flows into rivers and lakes,
It becomes so-called eutrophication and pollutes rivers, which is also an environmental problem.

Further, a cleaning agent made of powder requires a troublesome operation such as a problem in handling the powder in the production process or the need to manually prepare a detergent solution having a desired concentration at the time of cleaning. Inconvenient for industrial use. On the other hand, the liquid detergent can be automatically supplied from the container by a simple supply device, or the individual component stock solutions constituting the cleaning composition can be supplied from the supply device at a desired ratio and prepared. It is a preferred form for industrial use, such that a detergent solution having various concentration ratios can be freely prepared according to the purpose. Therefore, there is a strong demand for the development of a liquid cleaning agent which has excellent cleaning performance and is less likely to cause environmental pollution.

[0005]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned problems, the present inventors have earnestly conducted research and development on a liquid detergent having excellent cleaning performance and easily decomposed by microorganisms. It was found that the cleaning performance is remarkably enhanced by having such an aldohexose in combination with a water-soluble iron salt or a water-soluble aluminum salt, and succeeded in developing a liquid alkaline cleaner for hard surface cleaning with less environmental pollution. did. The present invention is based on such findings.

The present invention is a liquid alkaline detergent composition for cleaning hard surfaces, which comprises an alkali metal hydroxide as a main component, and is at least one selected from D-glucose, D-mannose and D-galactose. To provide a liquid alkaline detergent composition characterized by containing an aldohexose as an active ingredient,
A liquid alkaline detergent composition characterized in that the liquid alkaline detergent composition further contains at least one water-soluble metal salt selected from water-soluble aluminum salts or water-soluble iron salts as an active ingredient. It is provided. Furthermore, the present invention provides a cleaning method characterized in that, when the above-mentioned liquid alkaline cleaner composition is used, it is prepared in a desired ratio according to the purpose and then used for cleaning.

Aldohexose, which is an active ingredient of the liquid alkaline detergent composition for cleaning hard surfaces according to the present invention, is a naturally occurring D-glucose, D-mannose or D-glucose.
-Galactose, these aldohexoses are
It is industrially produced by hydrolyzing the starch, mannan or galactan, which are polysaccharides.
It was unexpected that these aldohexoses were found to have the action of enhancing the cleaning action of the alkaline detergent. Furthermore, by using aldohexose in combination with a water-soluble iron salt or a water-soluble aluminum salt, it acts as a chelating agent for capturing calcium ions, and it has been found that a very high cleaning effect comparable to EDTA-Na is exhibited. Was issued. The details of the mechanism by which these aldohexoses, which are monosaccharides, act together with a water-soluble metal salt to capture calcium ions are unknown, but it is a new finding found by the present inventors' research. Hereinafter, the present invention will be described in detail.

The alkali metal hydroxide used in the liquid alkaline detergent composition for cleaning hard surfaces according to the present invention is typified by sodium hydroxide or potassium hydroxide. In the present invention, this kind of alkali metal hydroxide is usually used. Sodium hydroxide, which is often used in liquid alkaline cleaners, is the preferred one. For this alkali metal hydroxide, an aqueous solution having a concentration of about 1 to 5% by weight is used as a base solution depending on the degree of contamination of the object to be cleaned. Among the aldohexoses composed of D-glucose, D-mannose or D-galactose, D-glucose is the most preferable in terms of detergency and calcium ion trapping action, and is industrially easily available. is there. The amount used is not particularly limited, but is about 0.3 to 5% by weight, and is usually 0.
A concentration of 5 to 2% by weight is suitable. Even if added in excess of 5% by weight, no improvement in cleaning effect is observed.

Examples of water-soluble iron salts include iron chloride, iron sulfate, potassium ferrocyanide and ammonium ferrocyanide. Especially, from the viewpoint of easy handling or price,
Iron chloride is the preferred one. Further, as the water-soluble aluminum salt, aluminum chloride, aluminum sulfate,
Examples include sodium aluminate, but sodium aluminate is the most preferable because it is easy to handle because there is no formation of an insoluble metal salt that is often seen when mixing an alkali metal hydroxide and a water-soluble aluminum salt. is there.

The mixing ratio of each active ingredient in the liquid alkaline detergent composition according to the present invention is not particularly limited, and may be an appropriate concentration ratio depending on the material of the object to be cleaned, the type of dirt and the adhered amount. Can be adjusted. In addition, it is optional to prepare a high-concentration product in advance and, when using it, dilute it to a necessary optimum concentration according to the purpose. Usually, the mixing ratio of the alkali metal hydroxide and the aldohexose is 10 to 50 parts by weight, preferably 25 to 50 parts by weight of the aldohexose per 100 parts by weight of the alkali metal hydroxide. The mixing ratio of the aldohexose and the water-soluble iron salt or the water-soluble aluminum salt is not particularly limited, but the molar ratio of aldohexose to all metal ions is 1: 0. It is about 0.01 to 1: 1 and is usually mixed and used in the range of 1: 0.4 to 1: 0.7.

Furthermore, it is optional to add to the liquid alkaline detergent composition according to the present invention, other additives which are usually used after being added to the alkaline detergent.
For example, it is possible to add a bleaching agent such as hypochlorite, or a foam suppressor such as a surfactant in a usual use ratio.

When the liquid alkaline detergent composition according to the present invention is used, it may be at room temperature or at about 70 to 80 ° C. depending on the type and amount of stains on the article to be washed and the material and shape of the article to be washed. Heated and applied. As the cleaning method, by contacting with a cleaning solution for a desired time, or by spraying a spray method or circulating in a pipe, or a commonly used cleaning method such as a brushing method can be applied. A method suitable for the cleaning purpose is selected. At that time, it is a particularly preferable embodiment as an industrial cleaning method to automatically supply the individual solutions of the respective constituent components constituting the cleaning agent of the present invention from a supply device at a desired mixing ratio for cleaning.

The liquid alkaline detergent composition according to the present invention exerts an excellent cleaning effect on both inorganic and organic stains, and can be applied to a wide range of hard surfaces irrespective of the type of material to be washed and the stain component. It can be applied to cleaning. Next, the present invention will be described in more detail with reference to the results of the calcium ion trapping test and the cleaning effect test of the liquid alkaline detergent composition according to the present invention as examples. The present invention is not limited to these examples.

[0014]

【Example】

Example 1 In this example, a solution containing sodium hydroxide and ferric chloride and each solution in which each aldohexose was added (total volume of water was 1000 ml
It was observed and compared. Table 1 shows the results.

[0015]

[Table 1]

As is clear from the results shown in Table 1, in the solution to which each aldohexose was added, no precipitation was observed. This phenomenon is transformed into some form of soluble substance by the action of each aldohexose and ferric chloride, and this soluble substance is prevented from forming an insoluble precipitate as a hydroxide.

Example 2 In this example, D- was added to an aqueous solution of an alkali metal hydroxide.
This is a test for the ability to capture calcium ions in a solution to which glucose and a water-soluble aluminum salt or D-glucose and a water-soluble iron salt have been added.
Sodium hydroxide was used as the alkali metal hydroxide, sodium aluminate was used as the water-soluble aluminum salt, and ferric chloride hexahydrate was used as the water-soluble iron salt. The amount of calcium ion was measured by the precipitation titration analysis method.

The analytical method was as follows.
Using coconut fatty acid sodium as a precipitation indicator, D-
In a sodium hydroxide aqueous solution containing glucose and sodium aluminate or D-glucose and ferric chloride,
An aqueous 0.1 M calcium acetate solution was added dropwise, and the point where cloudiness due to coconut oil fatty acid calcium occurred was taken as the end point. Using an automatic photometric titrator as an analyzer, the amount of 0.1 M calcium acetate aqueous solution required to reach the end point is converted into the amount of calcium carbonate, and each aldohexose or each aldohexose and sodium aluminate is used. Alternatively, it was calculated as the amount of calcium carbonate (mg) for 1 g of the component of ferric chloride (mixed in equimolar ratio). The results are shown in Table 2.

[0019]

[Table 2]

As is clear from Table 2, the calcium ion-capturing ability of each aldohexose was found to be enhanced by the combined use of sodium aluminate or ferric chloride, and in particular D-glucose and ferric chloride. When used in combination with 2 iron, extremely high calcium ion trapping performance was observed.

Example 3 In this example, the cleaning efficiency of the conventional cleaning composition and the cleaning composition of the present invention were compared and examined. Sodium hydroxide was used as the alkali metal hydroxide, sodium aluminate was used as the water-soluble aluminum salt, and ferric chloride hexahydrate was used as the water-soluble iron salt.

For the evaluation of the cleaning efficiency, an aqueous solution in which diatomaceous earth was dispersed as a stain component was uniformly applied on a glass plate and then dried at 105 ° C. for 8 hours to prepare an artificial dirt plate. This artificial dirt plate was immersed in each sample solution shown in Table 3 heated to 80 ° C. for 10 minutes, rinsed in still water, and the remaining amount of dirt on the washed surface after drying was measured using a gloss meter. The washing efficiency was calculated and compared with the glossiness of the artificial soil plate before washing and the glossiness of the artificial soil plate after washing. The solutions used for the cleaning efficiency test were prepared as two test solutions having two different hardnesses of calcium carbonate concentration of 60 ppm and 200 ppm. Table 3 shows the results.

[0023]

[Table 3]

As is clear from Table 3 above, the addition of D-glucose to the aqueous sodium hydroxide solution (Sample No. 1) (Samples Nos. 3 and 4) resulted in 60 ppm, 200 ppm.
An increase in cleaning efficiency was observed at any hardness of ppm. Furthermore, when D-glucose and a water-soluble metal salt were used in combination (Sample Nos. 5 to 14), the cleaning efficiency was higher than that of the alkaline detergent containing sodium hydroxide alone, and especially D-glucose and chlorination were used. When used in combination with ferric iron (Data Nos. 9 to 14), a detergent added with EDTA-Na, which has been regarded as the most powerful detergent in the past (Sample N).
o. An extremely high cleaning efficiency comparable to 2) was observed.

As is clear from the above, the liquid alkaline detergent composition for cleaning hard surfaces according to the present invention is synergistic in that the alkali metal hydroxide is used in combination with a specific aldohexose or a water-soluble metal salt. It exhibits a strong cleaning effect and is widely suitable for cleaning hard surfaces such as various kinds of glass, food manufacturing equipment, metal products and plastic products which are heavily contaminated with oil. Further, the liquid alkaline detergent composition for cleaning hard surfaces according to the present invention is easily decomposed by microorganisms and has no problem in terms of environmental pollution due to waste water. Moreover, since it is a liquid cleaning agent, it has an extremely high industrial utility value as a cleaning agent that is easy to handle, and it is a great contribution to the relevant technical field.

Claims (5)

[Claims] 1. A liquid alkaline detergent composition containing an alkali metal hydroxide as a main component for cleaning hard surfaces, comprising at least one aldo selected from D-glucose, D-mannose or D-galactose. A liquid alkaline detergent composition comprising hexose as an active ingredient. 2. A liquid alkaline detergent composition for cleaning hard surfaces, which comprises an alkali metal hydroxide as a main component, wherein at least one aldo selected from D-glucose, D-mannose or D-galactose is used. A liquid alkaline detergent composition comprising, as an active ingredient, hexose and at least one water-soluble metal salt selected from water-soluble aluminum salts or water-soluble iron salts. 3. The blending ratio of the aldohexose and the water-soluble metal salt is 1: 0.01 to 1: 1 in terms of metal ion.
The liquid alkaline detergent composition according to claim 2, having a molar ratio in the range of. 4. The liquid alkaline detergent composition according to any one of claims 1 to 3, wherein the aldohexose contains at least D-glucose as an active ingredient. 5. A method of cleaning a hard surface with a liquid alkaline cleaner containing an alkali metal hydroxide as a main component, which comprises D
-A liquid alkaline detergent composition containing at least one aldohexose selected from glucose, D-mannose or D-galactose and a water-soluble metal salt selected from a water-soluble aluminum salt or a water-soluble iron salt as active ingredients A method for cleaning, characterized in that, when a product is used, each component is mixed in a desired ratio in accordance with the purpose of use and then subjected to cleaning.