JPH0411981A - Contaminant removing method and agent - Google Patents

Abstract

PURPOSE:To remove the contaminant of grease by coating the surface of an article with a film forming resin contg. a resin previously made water-soluble and a swelling material as the effective component and bringing the article into contact with cleaning water after the article surface is contaminated. CONSTITUTION:The surface of an article is coated with a film forming resin contg. a resin previously made water-soluble and a swelling material as the effective component, and the article is brought into contact with cleaning water after the article surface is contaminated. The decontaminating agent consists of a film forming resin contg. a resin made water-soluble and a swelling material as the effective component. One or >=2 kinds among PVA, carboxymethyl cellulose, hydroxypropyl cellulose, methyl-cellulose, polyethylene oxide, etc., are used for the water-soluble resin. A highly water absorptive polymer based on starch, cellulose, synthetic polymer, etc., is exemplified as the swelling material.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a stain removal method and a stain removal agent.

[Conventional technology]

BACKGROUND ART Conventionally, in ventilation fans used in kitchens and the like, extremely laborious manual work was required to remove oil and fat stains from the blades. In such cases, the oil and fat deposited on the surface of the blades is usually scrubbed off with a brush or the like using a detergent.

Later, a method was devised in which a removable film was formed on the blade surface of a ventilation fan in advance and the dirt was removed along with the film. That is, after the ventilation fan has been used for a certain period of time, the oily film is peeled off to remove the dirt that has adhered to the ventilation fan.

Furthermore, a method of removing dirt adhering to the surfaces of stained utensils by soaking the stained utensils in a cleaning solution containing a specific cleaning agent has also been considered.

[Problem to be solved by the invention]

However, none of the above methods were sufficient.

In other words, using a brush or the like to scrub off the oil and fat adhering to the surface of the blade requires a lot of effort, and it is often difficult to completely remove the dirt despite the amount of effort.
There was also the problem of damaging the surface of the blade.

The method of forming a peelable film on the blade surface of a ventilation fan in advance also has the problem that it is difficult to form a film with a uniform thickness on the blade surface. That is, if a film of uniform thickness is not formed on the surface of the blade, the thinner parts of the film tend to tear when the film is peeled off. Furthermore, if the film is left in use for a long period of time, it becomes difficult to peel off the film itself.

On the other hand, regarding the method of using cleaning liquid, conventional cleaning liquids mainly contain strong alkalis such as sodium percarbonate, which creates a bad environment for workers because of the strong alkali, and the cleaning liquid adheres to the skin of workers. In some cases, problems such as water leakage may occur, and there is also the problem of having to treat wastewater.

Therefore, there has been a strong desire for a method for easily removing stains such as oil and fat that are difficult to remove, and a stain removal agent for use in the method.

In view of the problems of the prior art described above, the present invention aims to provide a method for easily removing hard-to-remove stains adhering to articles such as ventilation fans, and a stain remover for use in the method. do.

[Means to solve the problem]

In order to achieve the above object, the characteristic configuration of the stain removal method according to the present invention is that a film-forming resin containing a water-soluble resin and a swelling substance as active ingredients is applied to the surface of the article in advance, and the stain is removed from the surface of the article. After deposition, the article is contacted with wash water.

When the water-soluble resin is contained in the film-forming resin in an amount of 1 to 30% by weight, it is convenient for removing stains later.

It is more preferable for stain removal if the washing water contains one or more selected from surfactants, alkaline agents, and protective colloid agents.

On the other hand, the characteristic structure of the stain remover according to the present invention is that it is composed of a film-forming resin containing a water-soluble resin and a swelling substance as active ingredients.

Among these, the water-soluble resins include polyvinyl alcohol, carboxymethylcellulose, hydroxypropylcellulose, methylcellulose, polyethylene oxide, polyvinylpyrrolidone, pyrrolidone-vinyl acetate copolymer, methylvinylmaleic acid copolymer, acrylic acid-
One or two selected from methacrylic acid ester copolymers
Preferably, it is more than one species.

The water-soluble resin may be a resin that becomes water-soluble in the presence of an alkaline agent.

The stain remover may also contain a surfactant.

Preferably, the swelling substance is a superabsorbent polymer such as a starch-based, cellulose-based, or synthetic polymer-based polymer.

It is preferable that the swelling substance is contained in an amount of 0.5 to 10% by weight.

[Action/Effect]

Next, the functions and effects of the present invention will be explained.

In the stain removal method of the present invention, a film-forming resin containing a water-soluble resin and a swelling substance as active ingredients is applied in advance to the surface of an article where stains are expected to adhere, and if stains adhere to the article surface, After that, when this article is brought into contact with washing water, the water-soluble resin that makes up the film-forming resin is dissolved by contact with the washing water, and in addition to this, the swelling effect of the swelling substance causes it to adhere firmly. Swelling occurs between the dirt and the base material, causing the dirt to rise and become peelable, allowing the dirt to be easily and reliably removed from the surface of the article. In particular, with this configuration, even if there is some unevenness in the thickness of the film applied to the surface of the article, the film itself will not swell or swell due to contact with the washing water.
Since it dissolves, there is no difficulty in removing the stain.

If immersion is used as a means of contacting with water, there is no need for any work such as scrubbing, and dirt can be easily removed and removed by immersion alone.

When the water-soluble resin is contained in the film-forming resin in an amount of 1 to 30% by weight, a good effect in removing stains can be obtained. If the water-soluble resin in the film-forming resin is less than 1% by weight, it will not be possible to form a sufficient protective film, and if it contains more than 30% by weight, the stain removal effect will not be as noticeable despite the increased content. .

When the cleaning water contains one or more selected from surfactants, alkaline agents, and protective colloid agents, penetration of the aqueous solution into the film is promoted, and dirt once dissolved in the cleaning water is removed. It is possible to reliably prevent adhesion when the article is lifted out of the washing water again, and a desirable result can be obtained.

Various surfactants can be used, but
Particularly preferred are nonionic and anionic ones.

When polyvinyl alcohol, carboxymethyl cellulose, etc. are added as a protective colloid agent, a protective colloid is formed on the surface of the peeled/removed fat and oil, which is convenient because the stickiness characteristic of fat and oil disappears.

The above-mentioned washing water may be used at room temperature or in a warm water state.

On the other hand, since the stain remover of the present invention contains a water-soluble resin and a swelling substance as active ingredients, even if stains adhere to the surface of an article, the resin can easily swell and dissolve by using washing water. The dirt can be quickly detached and removed from the surface of the article.

Various types of water-soluble resins can be used, but
Particularly selected from polyvinyl alcohol, carboxydimethylcellulose, hydroxypropylcellulose, methylcellulose, polyethylene oxide, polyvinylpyrrolidone, pyrrolidone-vinyl acetate copolymer, methylvinylmaleic acid copolymer, acrylic acid-methacrylate ester copolymer. When one or more of them are used, they are themselves water-soluble and thus serve as convenient removal agents for dissolving and removing.

The water-soluble resin may be a resin that becomes water-soluble through a neutralization reaction in the presence of an alkaline agent.

For example, it is effective to use styrene maleic anhydride copolymer, rosin maleic acid copolymer, polyacrylic acid resin, etc. as such a resin.

Various kinds of swelling substances can be used, but starch-based, cellulose-based, and synthetic polymer-based superabsorbent polymers, which have a water absorption capacity of 10 to 1000 times their own weight, are particularly good. , polyacrylic acid salts, acrylic acid vinyl alcohol copolymers, isobutylene-maleic anhydride copolymers, starch-polyacrylonitrile hydrolysates, carboxydimethylcellulose crosslinked products, polyacrylonitrile hydrolysates There are formaldehyde crosslinked products.

The swelling substance has a 0. It is preferable that the content is 5 to 10% by weight, but in this case, it is 0.5% by weight or less,
No effect is observed, and if the amount is 10% by weight or more, the stain removal effect will not be significant even though the amount is increased, and it will take more time to remove the film itself, which is not preferable.

Furthermore, when a surfactant is included, it becomes easier for the aqueous solution to penetrate into the film, allowing stains to be removed from the surface of the article, making it easier to remove and remove stains from the surface of the article.

Furthermore, an appropriate amount of a plasticizer may be added to the stain remover, which is preferable because it improves the flexibility of the film and improves its adhesion to the substrate.

Similarly, an appropriate amount of a polyhydric alcohol such as glycerin or an inorganic filler such as finely divided silica may be added to the stain remover. It is more preferable because it improves the oil resistance of the film formed on the article and also improves the permeability of aqueous solutions.

Note that an appropriate amount of a preservative, a fungicide, a rust preventive, etc. may be included in the film-forming resin.

As described above, by carrying out the present invention, it is possible to greatly improve the dirt removal work that conventionally required the labor of a puppy, and the dirt removal does not damage the article and does not make the working environment particularly bad. It has an excellent effect.

〔Example〕

Next, examples of the stain removal method and stain removal agent according to the present invention will be described in detail together with comparative examples.

The stain remover used in this example was produced by dissolving and dispersing the following components in a solvent.

In addition, each component is clearly shown in weight %.

(Experimental Example 1) Protective film forming agent (Comparative example) (Removal agent of the present invention) Polyvinylpyrrolidone (water-soluble resin) 10 10 Water-absorbing polymer 2.0 Solvent (mainly ethanol) 90 88 (Experimental example 2) Protective film formation Agent (Comparative example) Styrene-maleic anhydride copolymer water-absorbing polymer alkali agent (triisopropanolamine) Solvent (based on ethanol) 2.5 2.0 87.5 (Removal agent of the present invention) 2.5 85. 5 (Experimental Example 3) Protective film forming agent (Comparative example) (Removal agent of the present invention) Styrene maleic anhydride copolymer 10 10 Water-absorbing polymer 2.0゛Alkaline agent (triisopropanolamine) 2.5 2 .5
Nonionic surfactant 1.0 1.0 Fine powder silica 0.6 0.6 Solvent (mainly ethanol) 85.9 83.9
Further, a cleaning agent was manufactured by mixing the following components.

Cleaning agent Anionic surfactant 5.0 Nonionic surfactant 5.0 Water
90 Next, the stain remover was applied to an ABS plate and an iron plate to form a protective film, and then mixed with degraded vegetable oil (1 part used tempura oil; 1 part dog bean oil; 1 part castor oil) at 180°C to form a protective film. time, then
A sample piece was prepared by applying an oil heat-treated at 200°C for 5 hours to the surface of this film.

Next, this sample piece was used together with a blank in which degraded vegetable oil was applied directly to the substrate, as well as a 45% sample to which 5% of the cleaning agent was added.
immersed in warm water at ℃. Furthermore, for comparison, the above blanks were immersed in 45°C warm water to which 5% of a commercially available soaking type detergent containing sodium percarbonate as a main ingredient had been added, and the extent to which these oil stains were removed was compared and observed. . The results are shown in Table 1.

The evaluation criteria in Table 11 are as follows: ◎: By immersion, the applied oil is completely removed within 10 minutes, and the sample piece becomes in the same state as before the protective film was formed.

○: The applied oil is removed by immersion in hot water, but the time required for this is about 10 to 30 minutes.

△: The applied oil is removed by soaking in hot water, but
The time required for this is 30 minutes or more.

×: It was impossible to remove the applied oil only by dipping.

As can be seen from the results in Table 1 above, it is clear that the stain remover according to the present invention exhibits superior effects compared to comparative removers.

It is also clear that the combination of the above cleaning agents has an excellent effect.

(Experimental Example 4) The removal agent used in Experimental Example 3 was applied to a ventilation fan blade (30 cm in diameter).
, 4 blades) after forming a protective film.
It was actually used at a tempura restaurant for two days. During this time, dirt such as oil dust was attached to the surface of the blade. This was immersed in 45°C warm water containing a detergent.

After 10 minutes, the oil stains on the protective film were completely peeled off and lifted off the blades of the ventilation fan.

(Experimental Example 5) The removing agent used in Experimental Example 3 was spray applied around a press machine in a press factory.

After 90 days of operation, punching oil, cutting oil, etc. adhered to the protective film.

Next, check the top 5 parts around the press machine that have this oil stain.
I showered with warm water at 0°C.

As a result, oil stains adhering to the area around the machine could be easily and cleanly washed away with light brushing.

The present invention can also be applied to stains with oil and fat such as cigarette tar, and the objects to be contaminated are not limited to plastic products, but can also be applied to various products such as metal, glass, and wood products. It is applicable to

The present invention can be effectively implemented not only in the home but also in removing dirt around various equipment and workplaces, walls, window glass, etc. in factories.

Claims (1)

[Claims] 1. A film-forming resin containing a water-soluble resin and a swelling substance as active ingredients is applied to the surface of the article in advance, and after dirt has adhered to the surface of the article, the article is brought into contact with cleaning water. How to remove stains by 2. The stain removal method according to claim 1, wherein the water-soluble resin is contained in the film-forming resin in an amount of 1 to 30% by weight. 3. The stain removal method according to claim 1 or 2, wherein the washing water contains one or more selected from surfactants, alkaline agents, and protective colloid agents. 4. A stain remover comprising a film-forming resin containing a water-soluble resin and a swelling substance as active ingredients. 5. The water-soluble resin is polyvinyl alcohol, carboxymethylcellulose, hydroxypropylcellulose, methylcellulose, polyethylene oxide, polyvinylpyrrolidone, pyrrolidone-vinyl acetate copolymer,
The stain removal method or stain removal agent according to any one of claims 1 to 4, which is one or more selected from methyl vinyl maleic acid copolymer and acrylic acid-methacrylic acid ester copolymer. 6. The stain removal method or stain removal agent according to any one of claims 1 to 4, wherein the water-soluble resin is a resin that becomes water-soluble in the presence of an alkaline agent. 7. The resin that becomes water-soluble in the presence of the alkaline agent is selected from styrene maleic anhydride copolymer, rosin maleic anhydride copolymer, and polyacrylic acid resin.
The stain removal method or stain removal agent according to claim 6, wherein the stain removal method or stain removal agent is one or more types. 8. The stain removal method or stain removal agent according to any one of claims 1 to 7, wherein the film-forming resin contains a surfactant. 9. The stain removal method or stain removal agent according to any one of claims 1 to 8, wherein the swelling substance is a superabsorbent polymer. 10. The stain removal method or stain removal agent according to claim 9, wherein the swelling substance is contained in an amount of 0.5 to 10% by weight.