JP2001271095A - Cleaning composition for molded plastic resin tableware and method for cleaning of tableware - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning composition for molded plastic resin tableware capable of completely cleaning the stain such as blot on the surface of the plastic resin without losing the luster of the resin and provide a method for the cleaning of the tableware. SOLUTION: The cleaning composition for a molded plastic resin tableware is composed of an inorganic alkaline aqueous solution containing 0.05-30 wt.% inorganic alkaline agent and an aqueous solution of an organic acid containing 0.01-30 wt.% organic acid. The stain such as blot on the surface of a plastic tableware can be removed without losing the luster of the surface of the tableware by immersing the tableware in the inorganic alkaline aqueous solution, rinsing with water, immersing in the aqueous solution of the organic acid and again rinsing the tableware with water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning composition for plastic resin molded tableware and a method for cleaning the same.
The present invention relates to a cleaning composition for a plastic resin molded tableware and a method for cleaning the same, which can remove stains and dirt on the surface of the plastic resin molded tableware which could not be removed with a conventional cleaning agent without impairing the gloss of the tableware surface.

[0002]

2. Description of the Related Art In the food service industry such as hotels and restaurants, schools, lunch centers, employee cafeterias, etc., tableware made of plastic resin molded, which is inexpensive, easily withstands shock and is not easily broken, has been used instead of ceramic. Such dishes have been cleaned by an automatic dishwashing machine using a cleaning agent containing an inorganic alkali agent as a main component, or by hand washing with various surfactants.

[0003]

In recent years, tableware made of plastic resin has been replaced by melamine resin from phenol, polycarbonate or epoxy resin due to environmental hormone problems. Melamine resin is a resin that is tough and has good heat resistance due to its properties.However, melamine resin molded tableware easily adheres to pigments, oils, lipsticks, etc., such as red ginger, coffee, Chinese food, etc. Various stains accumulate in the scratch, and stains occur on the resin surface. There is a problem that the stains cannot be completely removed only by an alkali detergent used in an automatic dishwasher or the like or a detergent mainly containing a surfactant.

[0004]

Means for Solving the Problems The present inventor has conducted intensive studies on dishwashing detergents made of plastic resin, and as a result,
It has been found that if the tableware is treated with the two kinds of cleaning compositions in a specific order, stains can be efficiently removed without losing gloss, and the present invention has been completed based on this finding.

That is, the present invention relates to a cleaning composition for cleaning plastic resin molded tableware, which is a cleaning composition for cleaning plastic resin molded tableware, comprising 0.05 to 30% by weight of an inorganic alkali agent. It is characterized by comprising an aqueous solution and an organic acid aqueous solution containing 0.01% to 30% by weight of an organic acid.

In addition, the method for cleaning tableware molded with plastic resin according to the present invention is characterized in that the inorganic alkali agent is contained in an amount of 0.05% by weight or less.
A plastic resin molded tableware is immersed in an aqueous solution of an inorganic alkali containing 30% by weight, rinsed with water, and then 0.01% of an organic acid is added.
The plastic resin molded tableware is immersed in an organic acid aqueous solution containing from 30% by weight to 30% by weight, and then rinsed with water.

[0007] By cleaning the plastic resin molded tableware as described above using the cleaning composition of the present invention, stains such as stains can be cleanly cleaned without losing the luster of the plastic resin surface.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a cleaning composition for a plastic resin molded dish and a method for cleaning the same according to an embodiment of the present invention will be described in more detail. The cleaning composition for plastic resin molded tableware according to the present invention comprises an inorganic alkali agent (1).
) And an organic acid aqueous solution containing an organic acid (two agents). The method for cleaning plastic resin molded tableware according to the present invention uses the cleaning composition, first uses an aqueous inorganic alkali solution, rinses well, and then performs cleaning using an aqueous organic acid solution.

The temperature of the aqueous inorganic alkali solution and the aqueous organic acid solution is preferably from room temperature to about 70 ° C., and more preferably from about 30 ° C. to 40 ° C. The inorganic alkali agent (one agent) that can be used in the present invention includes sodium hydroxide, potassium hydroxide, No. 1 / No. 2/3 sodium silicate, sodium orthosilicate, sodium metasilicate, potassium silicate, sodium carbonate, potassium carbonate ,
Sodium peroxide, sodium borate peroxide and the like can be mentioned. The mixing amount of the inorganic alkali agent with respect to water is 0.05% by weight to 30% by weight, and preferably 0.1% by weight to 20% by weight. If the compounding amount of the inorganic alkali agent is less than 0.05% by weight, the cleaning property cannot be expected, and if it exceeds 30% by weight, the cleaning power is not improved and the cost is increased.

In addition, a nonionic surfactant, an anionic surfactant, an amphoteric surfactant, a chelating agent, an enzyme, and the like can be appropriately added to these inorganic alkali agents. These surfactants are not particularly limited, for example, polyoxyethylene alkyl ether as a nonionic surfactant,
Examples include polyoxyethylene alkylphenyl ether, polyoxyethylene glycol fatty acid monoester, fatty acid alkanolamide, EO adduct of sorbitan fatty acid ester, sucrose fatty acid ester, monoglyceride and the like. Examples of the anionic surfactant include carboxylate such as soap, higher alcohol sulfate, higher alcohol ether sulfate, sulfated olefin, alkylbenzene sulfonate, alkylnaphthalene sulfonate and higher alcohol phosphate. And the like.

Further, examples of the amphoteric surfactant include alkyl dimethyl betaine, alkyl amino carboxylate, alkyl dihydroxyethyl betaine, alkyl imidazolinium betaine, and alkyl sulfo betaine. As the chelating agent, sodium tripolyphosphate, sodium ethylenediaminetetraacetate, sodium nitrile triacetate, sodium citrate, sodium gluconate and the like can be used. As the enzyme, protease, amylase, lipase and the like can be blended. When the enzyme is blended, it is necessary to blend the enzyme so that the enzyme activity is not deactivated.

In the cleaning composition according to the present invention, one type of nonionic surfactant and / or anionic surfactant and / or amphoteric surfactant can be used alone.
Alternatively, two or more types can be used in combination. In the cleaning composition of the present invention, the content of the nonionic surfactant and / or the anionic surfactant and / or the amphoteric surfactant is not particularly limited, but is 0.005% by weight to 2%.
0% by weight is preferred.

Next, the organic acids (two agents) usable in the present invention
As the aliphatic monocarboxylic acid, formic acid, acetic acid,
Propionic acid etc. are listed.
Formic acid and acetic acid are preferred. As the aliphatic dicarboxylic acid,
Oxalic acid, malonic acid, succinic acid, glutaric acid and the like can be mentioned, and oxalic acid and malonic acid are preferable for more detergency. As the hydroxy polycarboxylic acid, lactic acid, malic acid and citric acid are preferred. As the aromatic sulfonic acid,
Xylene sulfonic acid, p-toluene sulfonic acid and the like can be mentioned.

The compounding amount of the organic acid in water is from 0.01% by weight to 30% by weight, preferably from 0.1% by weight to 2% by weight.
0% by weight. If the compounding amount of the organic acid is less than 0.01% by weight, the detergency is hardly exhibited, and if it exceeds 30% by weight, the detergency is not so much improved and the cost is increased.

Further, a nonionic surfactant, an anionic surfactant and an amphoteric surfactant can be appropriately added to these organic acids. These surfactants are not particularly limited. For example, EO adducts of polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene glycol fatty acid monoester, fatty acid alkanolamide, and sorbitan fatty acid ester as nonionic surfactants And sucrose fatty acid esters and monoglycerides. Examples of the anionic surfactant include carboxylate such as soap, higher alcohol sulfate, higher alcohol ether sulfate, sulfated olefin, alkylbenzene sulfonate, alkylnaphthalene sulfonate and higher alcohol phosphate. And the like.

Further, examples of the amphoteric surfactant include alkyl dimethyl betaine, alkyl amino carboxylate, alkyl dihydroxyethyl betaine, alkyl imidazolinium betaine, and alkyl sulfo betaine.

[0017]

EXAMPLES The present invention will be described in more detail with reference to the following Examples and Comparative Examples. However, the cleaning composition for plastic resin molded tableware and the cleaning method according to the present invention are not limited to these Examples and Comparative Examples. It is not something to be done.

Detergency test As shown in the following Examples and Comparative Examples, an aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared, and the object to be cleaned was washed. As an object to be washed, a melamine resin vetch for a Chinese restaurant to which stains adhered was used. The object to be cleaned was immersed in an aqueous solution of an inorganic alkali or an organic acid whose concentration was appropriately adjusted for a predetermined time, taken out at an appropriate time, and the state of the surface was observed to evaluate the removability of the stain. When using an inorganic alkali aqueous solution and an organic acid aqueous solution,
To prevent contamination in the next step, it was always rinsed with water. The water used in the examples and comparative examples is tap water,
The detergency test was visually determined.

Example 1 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkali aqueous solution Sodium metasilicate 9-hydrate 2% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Water remaining 100% by weight Organic acid aqueous solution Oxalic acid 2% by weight Water remaining 100% by weight The object to be washed was placed in the object to be washed, left for 0.5 hour, rinsed with water, and the organic acid aqueous solution was heated to 30 ° C., and the object to be washed was placed in the object and left for 2 hours.

Example 2 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkaline aqueous solution Potassium carbonate 5% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Softanol 90 0.5% by weight Water remaining 100% by weight Organic acid aqueous solution Oxalic acid 0.01% by weight Softanol 90 0.1% by weight Water remaining 100% by weight The above-mentioned inorganic alkali aqueous solution is heated to 40 ° C., the object to be cleaned is put therein, and the resultant is left for 2 hours.
The object to be cleaned was placed in the material heated to ° C. and left for 4 hours.
The sophthanol 90 is manufactured by Nippon Shokubai Co., Ltd.

Example 3 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkaline aqueous solution Potassium carbonate 5% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Softanol 90 0.5% by weight Water remaining 100% by weight Organic acid aqueous solution Lactic acid 0.05% by weight Softanol 90 0.1% by weight Water remaining 100% by weight The above-mentioned inorganic alkali aqueous solution is heated to 40 ° C., the object to be cleaned is put therein, and the resultant is left for 2 hours.
The object to be cleaned was placed in the material heated to ° C. and left for 4 hours.

Example 4 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkali aqueous solution 30% by weight sodium carbonate 0.01% by weight sodium ethylenediaminetetraacetate 0.01% by weight of water 100% by weight of aqueous solution of organic acid Lactic acid 30% by weight of water 100% by weight of remaining amount After standing for a period of time, the object to be washed was rinsed with water, and the object to be washed was placed in the above-mentioned organic acid aqueous solution at room temperature and left for 0.5 hour.

Example 5 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkali aqueous solution Potassium carbonate 10% by weight Sodium carbonate 10% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Water remaining 100% by weight Organic acid aqueous solution Lactic acid 20% by weight Water remaining 100% by weight Put 1
After leaving for an hour, the object to be washed was rinsed with water, and the object to be washed was placed at room temperature in the organic acid aqueous solution, and allowed to stand for 1 hour.

Example 6 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkali aqueous solution Sodium carbonate 20% by weight Sodium metasilicate nonahydrate 10% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Water 100% by weight Organic acid aqueous solution Citric acid 30% by weight Water 100% by weight , And the object to be washed was put in the container and left for 2 hours.
The object to be cleaned was placed in the material heated to ° C. and left for 12 hours.

Example 7 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkaline aqueous solution Potassium carbonate 10% by weight Water 100% by weight Organic acid aqueous solution Oxalic acid 1% by weight Lactic acid 1% by weight Water 100% by weight
After leaving for a period of time, the object to be cleaned was placed in a solution of the organic acid aqueous solution at room temperature by rinsing with water and allowed to stand for 6 hours.

Example 8 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkaline aqueous solution Potassium carbonate 10% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Water remaining 100% by weight Organic acid aqueous solution 1% by weight oxalic acid Water The remaining 100% by weight
After leaving for a period of time, the object to be cleaned was placed in a solution in which the organic acid aqueous solution was heated to 40 ° C. by rinsing with water, and was left for 4 hours.

Example 9 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkali aqueous solution Sodium carbonate 1% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Water remaining 100% by weight Organic acid aqueous solution Xylene sulfonic acid 5% by weight Water remaining 100% by weight The above inorganic alkali aqueous solution is heated to 30 ° C. to be washed. And leave it for 2 hours.
The object to be cleaned was placed in the material heated to ° C. and left for 4 hours.

Example 10 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. Inorganic alkali aqueous solution Potassium carbonate 5% by weight Sodium metasilicate nonahydrate 5% by weight Sodium citrate 0.1% by weight Water remaining 100% by weight Organic acid aqueous solution Lactic acid 2% by weight Water remaining 100% by weight Installed in an automatic dishwasher / dryer (NP-C10 manufactured by Matsushita Electric Industrial Co., Ltd.), after washing at a washing temperature of 70 ° C., a washing time of about 0.5 hour, and a single rinse,
The organic acid aqueous solution was added, and the resultant was washed by a usual washing method (washing temperature: about 70 ° C., washing time: about 0.5 hour, rinsing three times).

Comparative Example 1 An aqueous inorganic alkali solution was prepared as follows. The above-mentioned inorganic alkali aqueous solution was heated to 30 ° C., and an object to be cleaned was put therein and left for 6 hours.

Comparative Example 2 The following inorganic acid aqueous solution was prepared. The above inorganic acid aqueous solution is heated to 30 ° C.
Left for hours.

Comparative Example 3 The following organic acid aqueous solution was prepared. The organic acid aqueous solution is heated to 40 ° C.
Left for hours.

Comparative Example 4 An aqueous solution of an inorganic alkali solution and an aqueous solution of an organic acid were prepared as follows. Inorganic alkaline aqueous solution Sodium metasilicate 9-hydrate 2% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Water 100% by weight Organic acid aqueous solution Oxalic acid 2% by weight Water 100% by weight Reverse the order of the washing liquid to be used. The organic acid aqueous solution is heated to 30 ° C.
The object to be cleaned was placed in a solution obtained by rinsing with water and heating the aqueous inorganic alkali solution to 30 ° C., and allowed to stand for 2 hours.

Comparative Example 5 An aqueous solution of an inorganic alkali and an aqueous solution of an inorganic acid were prepared. Inorganic alkali aqueous solution Sodium metasilicate 9-hydrate 2% by weight Sodium ethylenediaminetetraacetate 0.01% by weight Water remaining 100% by weight Inorganic acid aqueous solution Sulfuric acid 1% by weight Water remaining 100% by weight The above inorganic alkali aqueous solution was heated to 30 ° C. After the object to be washed was put therein and left for 0.5 hour, the substrate was rinsed with water and heated to an aqueous solution of an inorganic acid at 30 ° C., and the object to be washed was put therein and allowed to stand for 2 hours.

Comparative Example 6 An aqueous solution of an inorganic alkali and an aqueous solution of an organic acid were prepared as follows. The inorganic alkali aqueous solution of sodium metasilicate nonahydrate 0.005 wt% sodium ethylenediaminetetraacetate 0.001 wt% Water balance 100% by weight organic acid solution of lactic acid 0.005% by weight Water balance to 100 wt% of the organic acid solution to 30 ° C. Heat and put the object to be cleaned 4
After standing for a period of time, rinse with water to
The object to be cleaned was placed in the material heated to ° C. and left for 4 hours.

Tables 1 and 2 show the results of the cleaning tests in the above Examples and Comparative Examples, respectively. In addition,
In each table, an aqueous solution of an inorganic alkali is indicated by an “alkali agent”, and an aqueous solution of an organic acid and an aqueous solution of an inorganic acid are indicated by an “acid agent”. In addition, the evaluation of the cleaning property and surface state of the object to be cleaned in each table is as follows.
It is as follows. Evaluation Detergency ○: Almost dirt was removed (detergency 80% or more) △: Slight dirt remained (80 to 50%) ×: Almost no dirt was removed (50% or less) Surface condition ：: There is gloss and luster △: There is a little loss of gloss ×: The surface is rough and there is no luster

[0036]

[Table 1]

[0037]

[Table 2]

From the examples shown in Table 1, it was found that by treating with an aqueous solution of an inorganic alkali and then with an aqueous solution of an organic acid, it is possible to remove stain stains without impairing the surface gloss. As can be seen from the comparative examples in Table 2, stains on tableware cannot be removed by the inorganic alkali aqueous solution or the organic acid aqueous solution alone treatment, or the method of treating the organic acid aqueous solution first and then treating it with the inorganic alkali aqueous solution. In the treatment using sulfuric acid, which is a mineral acid, as an inorganic acid aqueous solution, stain stains are removed, but the gloss of tableware is lost. When the concentration of the detergent composition was as low as 0.005%, it was found that the cleanability was extremely poor.

[0039]

According to the present invention, an inorganic alkali agent is used in an amount of 0.1.
The plastic resin molded tableware is immersed in an aqueous solution of an inorganic alkali containing 0.05% to 30% by weight, rinsed with water, and then molded into an aqueous solution of an organic acid containing 0.01% to 30% by weight of an organic acid. By immersing the tableware and then rinsing it with water, it is possible to remove stains and other stains without impairing the gloss of the tableware surface.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C11D 7/38 C11D 7/38

Claims (5)

[Claims] 1. A cleaning composition for cleaning tableware molded with plastic resin, comprising an aqueous solution of an inorganic alkali containing 0.05 to 30% by weight of an inorganic alkali agent and 0.01 to 30% by weight of an organic acid. A cleaning composition for plastic resin molded tableware, comprising: an organic acid aqueous solution containing a weight percent. 2. The inorganic alkali agent is at least one selected from the group consisting of alkali metal hydroxides, alkali metal silicates, alkali metal carbonates and peroxides thereof. Item 7. The cleaning composition according to Item 1. 3. The organic acid is an aliphatic monocarboxylic acid,
The cleaning composition according to claim 1, wherein the cleaning composition is at least one selected from the group consisting of aliphatic dicarboxylic acids, hydroxy polycarboxylic acids, aromatic sulfonic acids, and derivatives thereof. 4. The method according to claim 1, wherein the content of the inorganic alkali agent is 0.05% by weight to 30%.
The plastic resin-molded tableware is immersed in an inorganic alkali aqueous solution containing 0.01% by weight and rinsed with water, and then the plastic resin-molded tableware is immersed in an organic acid aqueous solution containing 0.01% to 30% by weight of an organic acid. Next, a method for cleaning plastic resin molded tableware characterized by rinsing with water. 5. The plastic resin molded tableware is immersed in the inorganic alkali aqueous solution for 0.5 hours to 6 hours, and the plastic resin molded tableware is immersed in the organic acid aqueous solution for 0.5 hours to 2 hours. The cleaning method according to claim 4, wherein: