JPH0768555B2 - Detergent composition for automatic dishwasher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic tableware that has extremely low foaming property during cleaning and excellent dispersibility of scum (water-insoluble metal soap) even when the hardness of cleaning water is high. The present invention relates to a detergent composition for a washing machine.

[Prior art]

Automatic dishwashers are rapidly becoming popular not only for commercial use in restaurants, hospitals, schools, etc. but also for general household use in recent years. For this reason, many proposals have been made to date for detergents for automatic dishwashers.

By the way, at present, the mainstream of this type of detergent is an alkaline detergent containing a polyether polyol (Japanese Patent Publication No. 59-15).
No. 360) has been. This polyether polyol has an advantage that it has a low foaming property by itself, but since it has a poor detergency, particularly a cleaning effect on oil stains, when removing oil stains, an auxiliary additive component such as an alkali builder is used. Need use.

On the other hand, the main purpose of improving the detergency is the alkoxy ether of secondary alcohol (Japanese Patent Publication No. 54-25043).
And alkoxy ethers of lower alcohols (JP-A-58-
Those using low-foaming surfactants such as 147500) are known.

However, these surfactants still have insufficient low-foaming properties, and when they are used as a washing liquid for a spray type automatic dishwasher using a circulation pump with a small capacity for general households, for example. However, since a lot of foaming still occurs, the load on the motors is shortened, the life of the washing machine is remarkably shortened, and the bubbles are not easily broken at the time of rinsing.

Furthermore, in order to achieve low foaming properties of detergents, a combination of soaps has been proposed (Japanese Patent Laid-Open No. 50-22811, Japanese Patent Publication No. 58/58).
-44119), since these are mainly composed of soap, water-insoluble metallic soap, so-called scum is not deposited, and there is a problem in the feeling of finish, and the drawback of frequent damage to the washing machine occurs. is there.

〔Purpose〕

The present invention provides a detergent composition for an automatic dishwasher which overcomes the above-mentioned drawbacks of the prior art, has extremely little foaming during washing, and has excellent dispersibility of scum even if the hardness of washing water is high. The purpose is to provide.

〔Constitution〕

According to the present invention, the higher fatty acid soap is contained in an amount of 0.5 to 5% by weight, and the nonionic surfactant represented by the following general formula (A) is added to 1 part by weight of the higher fatty acid soap.
Automatic content of 5 to 5 parts by weight, and 1 to 10% by weight of at least one nonionic surfactant represented by the following general formula (B) or general formula (C) A detergent composition for a dishwasher is provided.

(N; integer from 2 to 8 m; integer from 2 to 8 n + m; integer from 4 to 16 l; integer from 7 to 19) (R; alkyl group having 10 to 20 carbon atoms; p; integer from 2 to 15; q; integer from 1 to 10) (Integer of x ₁ ; 1 to 30 x ₂ ; integer of _{1 to} 30 x ₁ + x ₂ ; integer of 2 to 60 Y; integer of 5 to 50) Second class represented by the general formula (A) used in the present invention Alcohol ethoxylate type nonionic surfactants themselves have detergency, easy dephosphorization, hard water resistance, compatibility, easy solubility,
It is known to be excellent in terms of defoaming properties and rinsing properties, but there is a problem with the cleaning power of tableware with severe oil stains, and there are still problems with defoaming properties during rinsing. Therefore, it is not always sufficient as a cleaning agent for an automatic dishwasher.

Further, a detergent using metal soap in combination has excellent foam-suppressing properties, but when used, it causes precipitation of water-insoluble metal soap, resulting in poor finishing feeling and damage to the device. .

The inventors of the present invention have developed a detergent for an automatic dishwasher which overcomes the disadvantages contained therein while maintaining the advantages of the secondary alcohol ethoxylate type represented by the general formula (A) as a detergent. In the process of proceeding, surprisingly, the compound represented by the general formula (A) was used in combination with the higher fatty acid soap, and at least 1 of the nonionic surfactant represented by the general formula (B) or the general formula (C) was used. A liquid detergent composition containing seeds and containing these compounds in a specific ratio has excellent defoaming properties during rinsing, and also has excellent scum dispersibility. The inventors have found that they are suitable as machine cleaners and have completed the present invention.

Hereinafter, the present invention will be described in more detail.

The present invention uses higher fatty acid soap as the first essential component of the detergent composition for an automatic dishwasher. As the higher fatty acid, those having 8 to 22 carbon atoms, particularly 12 to 18 carbon atoms are preferable.
Further, it may be a saturated fatty acid, an unsaturated fatty acid or a mixed fatty acid thereof. As the counter ion of the higher fatty acid, for example, an alkali metal salt such as sodium or potassium, an ammonium salt, an alkylol-substituted ammonium salt, or the like can be used. It is desirable to use ammonium salts.

The amount of this higher fatty acid soap is based on the total amount of the composition.
It is 0.5 to 5% by weight, preferably 1.5 to 4.5% by weight. If the blending amount is less than 0.5% by weight, foaming tends to occur during the machine washing process and it takes time during rinsing, which is not preferable. On the other hand, if it exceeds 5% by weight, not only scum is significantly generated, but also the feeling of finishing after cleaning is deteriorated.

Further, in the present invention, the nonionic surfactant represented by the general formula (A) is used as the second essential component of the detergent composition for an automatic dishwasher. The compound represented by the general formula (A) is a conventionally known compound, any of which can be applied, but n is 2 to 8, preferably 4 to 7, and m is 2 to 8,
Preferably 4 to 7, n + m is 4 to 11, preferably 8 to 1
It is suitable to use those in which 4 and 1 are 7 to 15, preferably 10 to 13.

The compounding amount of the compound represented by the general formula (A) is 0.5 to 5 parts by weight with respect to 1 part by weight of the water-soluble metal salt of the higher fatty acid,
It is preferably 1 to 3 parts by weight. If the blending amount is less than 0.5 part by weight, the feeling of finishing after washing is remarkably inferior, and if it exceeds 5 parts by weight, foaming is excessive and the defoaming property at the time of rinsing deteriorates.

In the present invention, one or more kinds of the ninonone surfactants represented by the general formula (B) or the general formula (C) are used together with the above two kinds of essential components.

As the polyoxyethylene polyoxypropylene ether of the higher aliphatic alcohol represented by the general formula (B),
Although conventionally known ones are used, R is an alkyl group having 10 to 20 carbon atoms, preferably 11 to 18 carbon atoms, P is 2 to 15, preferably 3 to 10 and g is 1 to 10, preferably 3 to 8 It is suitable to use the one of

Further, as the higher aliphatic alcohol, not only primary alcohol but also secondary alcohol can be used.

The so-called Pluronic type nonionic surfactant represented by the general formula (C) has a sum of x ₁ and x ₂ of 2 to 60,
It is desirable to use those having 10 to 40, Y of 5 to 50, preferably 10 to 40, and an average molecular weight of 1000 to 5000, preferably 2000 to 4000.

The amount of the compound represented by the general formula (B) and / or the general formula (C) used in the present invention is 1 to 10% by weight, preferably 2 to 8% by weight, based on the total amount of the detergent composition. .

If the blending amount is less than 1% by weight, the defoaming property at the time of rinsing is inferior, and the scum dispersing effect is not sufficiently exerted,
On the other hand, if it exceeds 20% by weight, the amount of foaming is too much, the defoaming property at the time of rinsing is deteriorated, and the foamer leaks from the washing machine to deteriorate the workability, which is not desirable.

The detergent composition for an automatic dishwashing machine of the present invention has a combination of the above-mentioned higher fatty acid salt and a specific nonionic surfactant as an essential component, but if desired, a detergent composition of this kind may be used. It is also possible to add various customary auxiliary ingredients. As such an auxiliary component, for example, a fragrance, a colorant, a bleaching agent, a bactericidal agent or the like can be added, and further, a common hydrotrope such as ethanol, propylene glycol, polyethylene glycol, toluene sulfonate, etc. May be included.
It may also contain citrate, CMC, gluconate, a water-soluble polymer, a chelating agent such as amylase and protease, or an enzyme.

The cleaning composition of the present invention can be applied to all commonly used tableware such as glass tableware, ceramics, plastic, aluminum, stainless steel, and copper tableware, and is a cleaning agent for industrial or general household automatic dishwashing machines. Widely used as.

〔effect〕

The detergent composition for an automatic dishwashing machine of the present invention uses the higher fatty acid soap and the nonionic surfactant represented by the general formula (A) in combination, and is represented by the general formula (B) or the general formula (C). Since at least one kind of nonionic surfactant used is mixed in a specific amount, foaming during cleaning is extremely small, and even if the hardness of the cleaning water is high, scum does not precipitate and is sufficiently dispersed in the composition. Excellent in defoaming during rinsing,
Further, since the work efficiency of the washing machine can be improved, its commercial value is extremely high.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to Examples.

Examples 1 to 16 and Comparative Examples 1 to 10 Various detergent compositions for automatic dishwashers having the compositions shown in Table 1 were prepared and subjected to tests for defoaming and scum dispersibility during washing.

The results are shown in Table-1.

The test method and evaluation method were as follows. Clean porcelain and beef tallow 0.5g / piece, butter on plastic dish
Put 4 dishes each with 0.5g / sheet attached and 2 plastic dishes without any dirt attached, composition concentration 0.2%
After washing with a dishwasher under the following conditions, the evaluation was performed according to the following evaluation method.

(I) Washing conditions 1) Dishwasher: A fully automatic dishwasher of the type in which a detergent solution is sprayed from a rotating nozzle and the dishes installed on the spray track are washed.

2) Washing temperature: The automatically supplied tap water (15 ° C) is gradually heated by the heater during washing, and the washing liquid temperature at the end of washing is 60 ° C.

3) Washing time: 20 minutes 4) Rinse: Rinse for 1 minute after water supply and perform draining cycle 3 times, and heat rinsing once while raising the temperature to 60 ° C.

5) Drying: After rinsing, the temperature inside the dishwasher is gradually raised to 80 ° C. and dried for 1 hour.

(Ii) Evaluation of foaming At the time of cleaning, hard water of 15 ° DH was used as the water used, and after 20 minutes of cleaning, the foaming in the automatic dishwasher of the cleaning liquid was measured, and the following criteria were given.

0 point: 30 mm or more 1 point: 24 to 29 mm 2 points: 18 to 23 mm 3 points: 12 to 17 mm 4 points: 6 to 11 mm 5 points: 0 to 5 mm (iii) Scum dispersibility Using 15 ° DH hard water, detergent 0.2 The turbidity at the time of heating at 60 ° C. in% concentration was visually evaluated and evaluated according to the following criteria.

⊚: Transparent ∘: Transparent but bluing as a whole liquid Δ: White turbidity ×: White turbidity and insoluble matter is deposited.

From the results of Table-1, the detergent composition for an automatic dishwasher of the present invention has the general formula (A), the general formula (B) or the general formula (C).
It can be seen that, unlike the case where the compound represented by (4) is used alone, foaming during cleaning is extremely small and scum dispersibility is extremely excellent.

Claims (1)

[Claims] 1. A higher fatty acid soap is contained in an amount of 0.5 to 5% by weight, and 0.5 to 5 parts by weight of the higher fatty acid soap is added with 0.5 to 5% of a nonionic surfactant represented by the following general formula (A).
5 parts by weight and at least 1 of the nonionic surfactant represented by the following general formula (B) or the following general formula (C).
A detergent composition for an automatic dishwasher, which comprises 1 to 10% by weight of seeds. (N; integer from 2 to 8 m; integer from 2 to 8 n + m; integer from 4 to 16 l; integer from 7 to 19) (R; alkyl group having 10 to 20 carbon atoms; p; integer from 2 to 15; q; integer from 1 to 10) (X ₁ ; integer _{1 to} 30 x ₂ ; integer _{1 to} 30 x ₁ + x ₂ ; integer 2 to 60 y; integer 5 to 50)