JP4615355B2 - How to wash dishes - Google Patents

Description

  The present invention relates to a method for cleaning dishes, and preferably relates to a method for cleaning dishes with an automatic dishwasher found in business use.

  Tableware used in hotels, restaurants, business cafeterias, restaurants, etc. is automatically washed by an automatic dishwasher. In such a situation, unlike homes, there are a lot of dishes to be cleaned, so the cleaning time for dishes to be cleaned is shortened, and a large amount of objects to be cleaned is washed in a batch or flow manner. . In order to obtain a cleaning effect in a short cleaning time, cleaning is performed using a highly alkaline dedicated cleaning agent at a high temperature of about 50 to 70 ° C.

  In school lunches and coffee shops, aluminum and anodized tableware and utensils are also used, and they are similarly washed by an automatic dishwasher. It is well known that aluminum and anodized materials are corroded by alkali, and a technique using an alkali metal silicate in combination as an anticorrosive is well known and used. However, when alkali metal silicate is used, in addition to carbonated scale, so-called silicate scales such as Ca silicate and Mg silicate are deposited, adhere to the inside of the washing machine and dishes to be cleaned, and are used for a long time. It gradually accumulates and causes whitening. When the whitening phenomenon progresses inside the washing machine, dirt is likely to adhere to the surface, resulting in a very unsanitary state. In addition, the finish quality of tableware is greatly impaired, and in particular, glasses and the like appear remarkably. Before such a state is reached, a scale removal operation with an acidic cleaning agent is periodically performed, which is economically and work-intensive. Furthermore, since it is difficult to remove the silicic acid scale with this acidic cleaning agent alone, it imposes a very heavy burden such as a rubbing operation. Especially glass can be a big problem.

  In contrast to these technical backgrounds, Patent Document 1 discloses a proposal for preventing the corrosion of aluminum with a high detergency by using a detergent composition containing sodium carbonate, an alkali metal silicate, and an organic phosphonate. ing.

  Patent Document 2 proposes a dishwashing agent composition that contains an alkali agent, an organic phosphonate, and a polymer water-soluble dispersant in specific ratios and is excellent in scale prevention effect.

  Patent Document 3 discloses a proposal that has an effect of preventing corrosion of aluminum and preventing scale, and the effect of preventing scale is improved by a combination of an aminopolycarboxylate and a polycarboxylate.

Further, Patent Document 4 describes a dishwashing composition that contains an organic diphosphonate and a specific ratio of silicate / carbonate (SiO ₂ / CO ₃ weight ratio) and improves the whitening problem due to scale. .
JP 2000-80400 A JP-A-10-226800 Japanese Patent Laid-Open No. 4-15300 Japanese National Patent Publication No. 11-510532

  However, Patent Document 1 does not mention the scale prevention effect. Patent Document 2 does not describe a clear proposal for preventing corrosion of aluminum. Further, there is still room for improvement in the scale prevention effect of Patent Document 3. Further, Patent Document 4 is suitable for an automatic dishwasher for home use with a long washing time because it has substantially low alkali strength, but is unsuitable for an application with a short washing time for business use. In addition, in the case of household use where there are few dishes and the number of washing batches is very small, once a day, twice a day, up to about 5 times a day, Although it is not so much trouble to manually put in the cleaning agent, it is very difficult to put it in by hand for business use where the number of cleanings per day is 10 times or more and at most 100 times or more. Not only is it time consuming, it is not easy to maintain an appropriate concentration.

  Therefore, the present invention is excellent in detergency even in a short washing time, prevents corrosion of light metals such as aluminum and anodized material, and has an excellent effect of preventing scales attached to the inside and the surroundings of the washing machine and tableware during long-term use. Another object is to provide a method for cleaning dishes.

The present invention comprises (A) an alkali agent (hereinafter referred to as component (A)) 40 to 80% by weight, (B) an organic phosphonate (hereinafter referred to as component (B)) 0.5 to 10% by weight, (C ) Low-foaming nonionic surfactant (hereinafter referred to as component (C)) 0.5 to 5% by weight, (A) is (A1) M ₂ O / SiO ₂ = 1/1 to 1/3 ( (A1) / (A2) = 1 / 0.2 to 1/2 (weight ratio), (A) / (B ) = 4 to 100 (weight ratio).

Moreover, this invention contains (A) component 40-80 weight%, (B) component 0.5-10 weight%, (C) component 0.5-5 weight%, (A) component is (A1). ) M ₂ O / SiO ₂ = 1/1 to 1/3 (weight ratio) containing an alkali metal silicate (M is an alkali metal) and (A2) an alkali metal carbonate, (A1) / (A2) = It is 1 / 0.2-1 / 2 (weight ratio), It is related with the detergent composition for tableware which is (A) / (B) = 4-100 (weight ratio).

  ADVANTAGE OF THE INVENTION According to this invention, the tableware by the automatic dishwasher which has the high washing | cleaning property in a short time washing | cleaning condition, prevents the corrosion of light metals, such as aluminum and anodized material, and was excellent in the scale prevention effect even if used for a long period of time. As a result, a reduction in maintenance burden due to periodic scale removal work is expected. Moreover, since the formation of a glass scale thin film can be suppressed, the life of the glass is consequently extended.

  In addition, because it has excellent cleaning performance in a short time, the processing speed of tableware is increased, and as a result, in places where a large amount of tableware is cleaned within a limited time, such as restaurants, coffee shops, school lunches, etc. Cleaning work can be performed efficiently.

<(A) component>
The component (A) consists of (A1) an alkali metal silicate [hereinafter referred to as (A1) component] of M ₂ O / SiO ₂ = 1 / 1-1 / 3 (weight ratio), and (A2) an alkali metal carbonate. Salt (hereinafter referred to as “component (A2)”) at (A1) / (A2) = 1 / 0.2 to 1/2 (weight ratio). Below, these (A) and (A) component are demonstrated.

<(A1) component>
The alkali metal silicate of the component (A1) is represented by M ₂ O · n (SiO ₂ ) (wherein M is sodium and potassium, and n is the number of moles of SiO ₂ ). Specific examples include sodium metasilicate, potassium metasilicate, No. 1 sodium silicate, No. 1 potassium silicate, No. 2 sodium silicate, No. 2 potassium silicate. Among them, sodium metasilicate, potassium metasilicate, No. 1 sodium silicate, No. 1 potassium silicate is preferred. Further, since the alkali metal orthosilicate has an M ₂ O / SiO ₂ molar ratio of 2/1, the molar ratio is the same as that of No. 1 alkali metal silicate having an M ₂ O / SiO ₂ molar ratio of 1/2. The following can be blended and used.

The M ₂ O / SiO ₂ molar ratio of the component (A1) is 1/1 to 1/3, preferably 1/1 to 1/2. When M ₂ O is large, aluminum is corroded, and when SiO ₂ is large, silicic acid scale is generated and there is a decrease in detergency due to a decrease in alkali strength.

<(A2) component>
The (A2) component alkali metal carbonate is effective for reinforcing alkali strength, and in addition, it is effective as an extender when the product form is solid or powder. The alkali metal carbonate here is arbitrarily blended for such purposes, and is an alkali metal carbonate that is generated by absorbing carbon dioxide in the air during product storage and handling, a so-called carry-over component. Certain alkali metal carbonates are not included.

  Specifically, sodium carbonate and potassium carbonate are effective and are preferably used depending on the product form, although not limited thereto. When taking the form of a liquid product, potassium carbonate having high solubility is preferable, and when taking the form of a solid or powder product, powdered or granular sodium carbonate is preferably used.

  The component (A) plays a very important role for improving the cleaning effect in a short time, and is blended in the cleaning composition used in the present invention at 40 to 80% by weight, preferably It is 45 to 75% by weight, more preferably 45 to 70% by weight, and most preferably 50 to 70% by weight. When the blending amount of the component (A) is 40% by weight or more, a sufficient cleaning effect can be exhibited under cleaning conditions in a short time of 10 seconds to 3 minutes. Moreover, if it is 80 weight% or less, the cleaning effect in a short time is favorable, and the scale prevention effect is also sufficient.

  From the aspect of scale prevention effect, the weight ratio of (A1) alkali metal silicate and (A2) alkali metal carbonate is important, and (A1) / (A2) is 1 / 0.2 to 1/2, Preferably it is 1 / 0.5 to 1 / 1.5. When there are few (A1) components, generation | occurrence | production of a silicate scale can be reduced, and generation | occurrence | production of a carbonic acid scale can be reduced when there are few (A2).

As the component (A), in addition to the components (A1) and (A2), an alkali metal hydroxide salt (MOH) (M is an alkali metal) can be used for the purpose of alkali strengthening. However, MOH is expressed as 1 / 2M ₂ O in addition to M ₂ O in (A1), and if the addition amount is adjusted so that the M ₂ O / SiO ₂ molar ratio does not exceed 1/1, aluminum is not corroded. The alkali strength can be increased. Therefore, it is effective when the M ₂ O / SiO ₂ molar ratio in (A1) is ½ or less.

<(B) component>
As the component (B), 1-hydroxyethane-1,1-diphosphonic acid [CH ₃ C (OH) [PO (OH) ₂ ] ₂ ] (abbreviation: HEDP), aminotri (methylenephosphonic acid) [N [CH ₂ PO (OH) ₂ ] ₃ ] (abbreviation: ATMP), ethylenediaminetetra (methylenephosphonic acid) [N ₂ (CH ₂ ) ₂ [CH ₂ PO (OH) ₂ ] ₄ ], diethylenetriaminepenta (methylenephosphonic acid) [ N ₃ (CH ₂ ) ₂ [CH ₂ PO (OH) ₂ ] ₅ ], 2-phosphono-1,2,4-butanetricarboxylic acid [PO (OH) ₂ CH ₂ CCH ₂ CH ₂ (COOH) ₃ ] ( Abbreviation: PBTC) and the like, and sodium salt or potassium salt of HEDP, ATMP, PBTC is preferable, and sodium salt of HEDP, ATMP or Potassium salts are most preferred. Most preferred is the sodium or potassium salt of ATMP.

  Although (B) is mix | blended 0.5-10 weight% in the cleaning composition used for this invention, Preferably it is 1-8 weight%, More preferably, it is 1-5 weight%.

  Moreover, (A) component and (B) component are mix | blended in the detergent composition used for this invention in (A) / (B) weight ratio in the range of 4-100, but scale prevention property, From the viewpoint of environmental load and economy, the (A) / (B) weight ratio is preferably 2 to 50, particularly preferably 5 to 30.

<(C) component>
The low-foaming nonionic surfactant of component (C) refers to one that exhibits sufficient water-solubility or water-dispersibility and does not produce excessive foam even when used for machine washing. Specifically, at least one selected from the following general formulas (1) to (6) is preferable. Of these, compounds of general formulas (1) to (3) are preferred, and compounds of general formula (1) are most preferred.

HO- (PO) x- (EO) y- (PO) zH (1)
HO- (EO) a- (PO) b- (EO) cH (2)
[In the formula, EO represents an oxyethylene group, PO represents an oxypropylene group, and x, y, z, a, b, and c are all numbers greater than 0, and x, z, and b are average additions of propylene oxide. The number of moles, x + z ≦ 60, preferably 10-50, b ≦ 60, preferably 10-50, y and a, c represent the average number of moles of ethylene oxide added, y ≦ 150, preferably 2-50, a + c ≦ 150, preferably 2-50. ]
R ¹ -O (EO) nR ² (3)
[Wherein, R ¹ represents a linear or branched alkyl group having 1 to 24 carbon atoms, EO represents an oxyethylene group, n represents a number of 8 to 30 indicating the average number of moles of ethylene oxide added, R ² Represents a linear or branched alkyl group having 1 to 18 carbon atoms. ]
R ³ -O- (EO) x- (PO) y- (EO) zR ⁴ (4)
[Wherein R ³ and R ⁴ are the same or different and each represents a linear or branched alkyl group having 1 to 24 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms (provided that R ⁴ also includes a hydrogen atom) ), EO represents an oxyethylene group, and PO represents an oxypropylene group. x and z each represent an average addition mole number of ethylene oxide of 1 or more, preferably 2 to 10, and y is a number of 1 to 4 indicating the average addition mole number of propylene oxide. (EO) x, (PO) y, and (EO) z are block-connected in this order. ]
R ⁵ -O- (EO) x- (PO) yR ⁶ (5)
R ⁵ -O- (EO) x- (BO) zR ⁶ (6)
[Wherein R ⁵ and R ⁶ are the same or different and each represents a linear or branched alkyl group having 1 to 24 carbon atoms or a cycloalkyl group having 3 to 12 carbon atoms (provided that R ⁶ includes a hydrogen atom) ), EO represents an oxyethylene group, PO represents an oxypropylene group, and BO represents an oxybutylene group. x, y, and z are numbers of 1 to 20, each representing the average number of moles of addition of ethylene oxide, propylene oxide, and butylene oxide. ]

  The component (C) is 0.5 to 5% by weight, preferably 0.5 to 3% by weight, more preferably, in the cleaning composition used in the present invention, from the viewpoint of the cleaning property of the oily soil and the appearance of the product. 0.5 to 2% by weight is blended.

<(D) component>
In the detergent composition used in the present invention, the effect of preventing scale can be further enhanced by using a polymer carboxylic acid or a salt thereof (hereinafter referred to as “component (D)”) in combination.

  The component (D) is preferably one or more selected from polyacrylic acid or a salt thereof, polymaleic acid or a salt thereof, and an acrylic acid-maleic acid copolymer or a salt thereof. Some or all of these may be salts, and the salt is preferably an alkali metal salt such as sodium or potassium.

  The weight average molecular weight of the component (D) is preferably 2,000 to 100,000, but the weight average molecular weight of the polyacrylic acid is preferably 2,000 to 20,000, particularly preferably 2,000 to 15,000. . Examples of the maleic acid polymer include polymaleic acid or a salt thereof which is a homopolymer of maleic acid, and a copolymer or a salt thereof with another monomer copolymerizable with maleic anhydride. Such a copolymer has a structure represented by the following general formula (7).

[Wherein R ₁ , R ₂ , R ₃ and R ₄ represent hydrogen, an alkyl group having 1 to 5 carbon atoms, a phenyl group, an alkoxy group or a carboxyl group, and M represents hydrogen, an alkali metal or an organic amine. And x and y are numbers satisfying x / y (molar ratio) = 1/10 to 10/1, and the weight average molecular weight is 2,000 to 100,000. ]

  In the above general formula (7), x / y (molar ratio) is 1/10 to 10/1, preferably 3/7 to 7/3. The weight average molecular weight of the maleic acid polymer represented by the general formula (7) is 2,000 to 100,000, preferably 2,000 to 80,000, and further 5,000 to 80,000. Is preferred. As the maleic acid copolymer having the structure represented by the general formula (7), an acrylic acid-maleic acid copolymer or a salt thereof is preferable.

  The weight average molecular weight of the component (D) is measured by gel permeation chromatography (GPC) (standard substance: polyethylene glycol).

<Optional component>
The cleaning composition used in the present invention includes, as optional components, chelating agents (hereinafter referred to as (E) component), effective chlorine releasing components such as hypochlorite and chlorinated isocyanurate, fatty acids and phosphoric acid. It may contain components generally blended in dishwashing agents such as esters, silicone-based antifoaming agents, enzymes, pigments and dyes, and fragrances. When taking a liquid product form, a transparent and stable product appearance can be obtained by using a medium chain fatty acid alkali metal salt such as sodium caprylate or a glycol solvent such as propylene crigor as a solubilizer. (E) The chelating agent of component is a chelating agent other than (B) component and (D) component, specifically, hydroxycarboxylate represented by citrate, nitrilotricarboxylic acid (NTA) salt, Examples thereof include aminocarboxylates such as ethylenediaminetetracarboxylic acid (EDTA) salt and condensed phosphates such as tripolyphosphate. Of these, citrate, NTA salt, EDTA salt and tripolyphosphate are preferred. The salt is preferably an alkali metal salt such as sodium salt or potassium salt.

  The cleaning composition takes the form of a liquid type or a solid or powder type, and in the case of the liquid type, a balanced amount of water is blended. In the case of a solid or powder type, an alkali metal sulfate, an alkali metal hydrogen carbonate, or the like may be included as a bulking agent.

[Cleaning method]
In the present invention, the dishes are washed for 10 seconds to 3 minutes with the washing liquid prepared from the detergent composition, but the washing is preferably performed using an automatic dishwasher. In general, an automatic dishwasher for business use includes a cleaning nozzle (usually a spray type or a shower type) for cleaning, a cleaning liquid tank, a pump, a heat source, etc., and a nozzle for rinsing and rinsing water as components. It is equipped with a tank, pump, heat source, etc., a box that prevents the cleaning liquid and rinsing water from splashing, and an installation section for installing tableware. The cleaning liquid in the cleaning liquid tank is transferred by the pump and sprayed from the cleaning nozzle to the tableware. Further, the dishes are automatically and continuously washed by a mechanism in which the rinse water in the rinse water tank is transferred by a pump and sprayed from the nozzles onto the washed dishes.

  In the washing by the automatic dishwasher, the cleaning composition according to the present invention is arbitrarily transferred into the automatic dishwasher by the supply device to maintain a proper detergent concentration. When the product form of the cleaning agent is liquid, a dedicated tube is directly inserted into a container such as a plastic filled with the cleaning agent, and is sucked and supplied. If the cleaning agent is in solid or powder form, set the plastic hopper filled with the cleaning agent in the dedicated hopper, or set the cleaning agent filled in the pouch container etc. in the dedicated hopper. Instead, water or hot water is sprayed onto the cleaning agent by spraying or showering to produce a concentrated cleaning solution and supplied to the inside of the cleaning machine.

  The concentration of the cleaning composition in the cleaning liquid is preferably 0.04 to 0.5% by weight, but is preferably 0.05 to 0.3% by weight from the viewpoints of economy and cleaning effect, and more preferably 0.07%. ~ 0.25 wt% is preferred.

  The cleaning time for tableware is 10 seconds to 3 minutes, and within this range, the amount of tableware that can be cleaned per unit time increases, and a sufficient cleaning effect is obtained. Preferably, the washing time is 20 seconds to 2 minutes. This cleaning time is defined as the time that the cleaning liquid is in contact with the dishes, and in particular when using an automatic dishwasher, the cleaning time is defined as the time that the cleaning liquid sprayed from the cleaning nozzle is in contact with the dishes. .

  The temperature of the cleaning solution is very important for increasing the cleaning efficiency in a short time, and is preferably 40 ° C. or higher, and particularly preferably 40 to 70 ° C. After the dishes are washed, they are immediately rinsed with water or warm water in the washing machine, and in some cases, drying and sterilization processes are performed with hot water at 70 to 90 ° C.

  In the case of continuously washing dishes, the concentration of the detergent in the washing liquid decreases with the number of washings due to carry-out of the washing liquid by the dishes and carry-over of rinse water to the washing layer. In order to maintain an appropriate cleaning agent concentration, when the cleaning agent concentration decreases, the cleaning agent is supplied to the cleaning liquid by the automatic supply device so as to obtain an appropriate concentration.

  The automatic supply device for the cleaning composition is not particularly limited, but means for detecting the concentration of the cleaning composition in the cleaning liquid and the cleaning agent in the cleaning liquid in relation to the concentration of the cleaning composition in the cleaning liquid. It is preferable to maintain the concentration of the cleaning composition in the cleaning liquid at a predetermined amount using an automatic supply device provided with means for supplying the composition. Specifically, when the concentration of the cleaning composition in the cleaning liquid in the cleaning machine is sensed, a signal is received, and the product form of the cleaning composition is liquid, the tube pump is driven and the powder or solid In this case, water or warm water is sprayed or sprayed on the cleaning composition in the form of a shower to supply a necessary amount of the cleaning composition. That is, it is preferable that the automatic supply device has a function of supplying the cleaning composition to the cleaning liquid in relation to the concentration of the cleaning composition in the cleaning liquid.

  This automatic supply device is suitable for business use where the number of cleanings per day is very large, and has the advantage that it can be overwhelmingly reduced compared to manual feeding for each number of cleanings. It becomes easy to maintain an appropriate concentration of the cleaning composition in the cleaning liquid throughout the cleaning process.

  When the form of the cleaning composition is solid or powder, it is important to consider solubility. When the concentration of the cleaning composition in the cleaning liquid is lower than the specified concentration and the signal is received, if the cleaning composition has good solubility, that is, if the dissolution rate is fast, the supply of the cleaning composition concentrate becomes rapid and the cleaning liquid The proper concentration of the detergent composition in the inside is maintained, and the cleaning properties of the dishes become appropriate. Usually, it is preferable to use warm water rather than water as conditions for preparing the detergent composition concentrate, and it is more preferable that the flow rate is smaller and larger. In addition, from the viewpoint of solubility, it is necessary to pay attention to the steps of densification of the cleaning composition, such as blending of morphological processing components such as a binder, and tableting and blocking. In general, it contains powders, granules, etc. in which each component is mixed rather than a tablet-like or block-like detergent composition that contains a binder such as high-molecular-weight polyethylene glycol and is processed by a densification process. This is more advantageous in terms of solubility under cold water or low-pressure water conditions.

  In the tableware cleaning method of the present invention, it is preferable to continuously clean the tableware using the cleaning liquid in a circulating manner. Moreover, it is preferable to wash dishes using an automatic dishwasher.

  Examples of automatic dishwashers that can be used in the cleaning method of the present invention include door-type washer and conveyor-type washer.

  The tableware washing method using the door type washing machine is a batch type washing method in which the tableware set in the dedicated rack is washed under a predetermined condition and then the other unwashed tableware taken out is washed. It is. By repeating a cleaning batch of dishes using a door-type washer, a large amount of dishes can be cleaned. For example, 200 batches can be cleaned in 5 hours if one batch is processed for 90 seconds. It becomes possible. As a commercially available door type washing machine that can be used in the present invention, “SANYO DR53” manufactured by Sanyo Electric Co., Ltd. can be mentioned. In the cleaning method using the door-type cleaning machine, the volume ratio of the dishes to the cleaning liquid is preferably tableware / cleaning liquid = 0.1 / 40 to 10/40. Moreover, in the cleaning method using a door-type cleaning machine, the circulation amount of the cleaning liquid is preferably in the range of 100 to 500 L / min.

  On the other hand, the tableware cleaning method using a conveyor type washing machine is a continuous cleaning method in which tableware set directly on a conveyor unit or set on a dedicated rack is continuously cleaned under predetermined conditions. The conveyor type washing machine has a high ability to wash dishes, so if you wash dishes continuously, wash dishes about 1.5 to 4 times more than if you use a door type washing machine. Is possible. Examples of commercially available conveyor type washing machines that can be used in the present invention include “SANYO DW-2000R (L)” manufactured by Sanyo Electric Co., Ltd. In the cleaning method using the conveyor type cleaning machine, the volume ratio of the dishes to the cleaning liquid is preferably tableware / cleaning liquid = 0.1 / 100 to 10/100. Moreover, in the cleaning method using a conveyor type cleaning machine, the circulation amount of the cleaning liquid is preferably in the range of 500 to 2000 L / min.

  The pH of the cleaning liquid prepared from the cleaning composition used in the present invention is preferably 11 to 13 and more preferably 11 to 12 at 25 ° C., and the pH of the cleaning liquid is within the above range even at the temperature at the time of cleaning. It is preferable.

<Test example>
The following evaluation was performed about the cleaning composition shown to Table 1,2. These detergent compositions are manufactured by adding sodium sulfate to the components (A) to (E) shown in Tables 1 and 2 to 100% by weight, and then mixing until uniform. Since the components (A) to (B) are water-containing products, the effective component can be calculated as excluding water.

(1) Aluminum corrosion test (non-corrosive evaluation)
A test piece made of aluminum (manufactured by Nippon Test Panel Co., Ltd., A1050P, 20 mm × 50 mm × 1 mm) is previously washed with a neutral detergent, treated with acetone and dried. 50 g of a detergent diluent obtained by diluting the detergent composition shown in Tables 1 and 2 with tap water to 0.1% by weight is placed in a 50 mL plastic container.

  Immerse the entire test piece in contact with the detergent diluent and cap it and store at room temperature for 24 hours. After 24 hours, the test piece was taken out, rinsed with ion-exchanged water and then dried. The state of the test piece surface was visually observed, and the non-corrosiveness was evaluated according to the following criteria.

Judgment criteria ○: No change △: White discolored part is observed ×: Brown or black discolored part is recognized

(2) Scale adhesion test (evaluation of scale prevention)
Stainless steel test pieces (Japan Test Panel, JIS G4305, 15 × 40 × 1 mm) and slide glass (Matsunami Glass Industry, 26 mm × 76 mm × 1 mm) are washed with a neutral detergent in advance, treated with acetone and dried. Use what you let me. 100 g of a detergent diluent obtained by diluting the detergent composition shown in Tables 1 and 2 with tap water to 0.1% by weight is placed in a 100 mL plastic container.

  The test piece is immersed so that the entire test piece comes into contact with the detergent diluent, and 2 mL of Ca / Mg hard water adjusted to 600 degrees (in terms of German hardness) is added and capped, and stored in a 60 ° C. dryer for 24 hours. After 24 hours, the test piece is taken out, rinsed with ion exchange water and then dried, and the state of the test piece surface is visually observed. In addition, the weight of the test piece before immersion and after immersion (drying) is measured with a balance capable of weighing up to 0.1 mg, and the amount of scale adhesion is determined by the difference. From the state of the surface of the test piece and the amount of scale attached, the scale prevention property was evaluated according to the following criteria. The Ca / Mg hard water is obtained by dissolving 9.5 g of calcium chloride (anhydrous) and 4.34 g of magnesium chloride (hexahydrate) in 1 L of ion-exchanged water to 600 degrees.

Judgment criteria ○: Scale adhesion not recognized (Scale adhesion: 0.0 mg)
Δ: A small amount of scale adheres (scale deposit: 0.1 to 0.5 mg)
×: Clearly adhering to the scale (scale adhering amount: more than 0.5 mg)

(3) Detergency evaluation The pH (25 ° C) and alkalinity of a detergent diluent obtained by diluting the detergent composition shown in Tables 1 and 2 with tap water to 0.1% by weight were measured according to the following criteria. Detergency was evaluated. The alkalinity is evaluated as a concentration (ppm) in terms of NaOH. 100 g of the detergent diluent is weighed into a beaker, and a few drops of phenolphthalein (1% ethanol solution) indicator is added to make it red. From this, titration was performed with 0.1N hydrochloric acid until the red color disappeared, and the titration amount was calculated by the following equation.
Alkalinity (NaOHppm) = Titration (mL) × [0.4 / 100 (g)] × 10000

Criteria ◎: pH is over 12 and NaOH concentration is over 350 ppm ○: pH is 11 or more and 12 or less, and NaOH concentration is 220 ppm or more and 350 ppm or less Δ: pH is 11 or more and 12 or less and NaOH concentration is less than 220 ppm ×: pH Is less than 11 and NaOH concentration is less than 220 ppm

(Note) The components in the table are as follows.
* 1: Product name powdered sodium silicate No. 1, Nippon Chemical Industry Co., Ltd., Na ₂ O / SiO ₂ = 1/2, 22.5% by weight water-containing product * 2: Product name dry metacaustic 5aq, Guangei Chemical Industry Co., Ltd., Na ₂ O / SiO ₂ = 1/1, 42.5 wt% water-containing product * 3: Product name Neoortho 80 grains, Guangei Chemical Industry Co., Ltd., Na ₂ O / SiO ₂ = 2/1, 20 wt% water-containing product * 4: Product name DEQUEST2006, Solusia Japan Co., Ltd., aminotri (methylenephosphonic acid) pentasodium salt, effective 40% by weight
* 5: Product name DEQUEST2016, Solusia Japan, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, effective content 30% by weight
* 6: Product name Pluronic PE6100, BASF Japan Ltd., ethylene oxide / propylene oxide / ethylene oxide copolymer, weight average molecular weight 2000, ethylene oxide molar fraction 10%
* 7: Product name Pluronic RPE2520, BASF Japan Ltd., propylene oxide / ethylene oxide / propylene oxide copolymer, weight average molecular weight 3100, ethylene oxide molar fraction 20%
* 8: Product name Socaran CP5, BASF Japan Ltd., acrylic acid-maleic acid copolymer sodium salt, acrylic acid / maleic acid = 7/3 (molar ratio), weight average molecular weight 70000
* 9: Product name Aquaric DL-100, Nippon Shokubai Co., Ltd., sodium salt of acrylic polymer, weight average molecular weight 3500

<Example 1 and Comparative Example 1>
The present invention products 1 and 10 in Tables 1 and 2 and the comparative product 5 were used to evaluate the detergency under the following conditions. The results are shown in Table 3.

(1) Production of model dirt On the center of a ceramic dish having a diameter of about 20 cm, 2 g of egg yolk is uniformly applied with a brush in a circle having a diameter of about 16 cm and placed in an electric dryer set at 80 ° C. Thirty minutes later, the egg yolk-coated dish was taken out, and the naturally cooled one was used as a model soil for evaluation of detergency.

(2) Detergency evaluation Hot water at 60 ° C. was introduced into a door-type commercial dishwasher [SANYO DR53, manufactured by Sanyo Electric Co., Ltd.], and a detergent composition (this product 1, 10 or comparative product 5) Was weighed and charged. The cleaning bath was about 38 L, and the concentration of the cleaning composition in the cleaning liquid was about 0.1% by weight. Set two model dirt dishes in a dedicated rack, change the cleaning time to 5 seconds, 1 minute, 2 minutes, 5 minutes, and circulate the cleaning liquid prepared in the cleaning liquid tank at a flow rate of 280 L / min. Sprayed from a spray nozzle and washed. After washing, 2.6 L of warm water at 80 ° C. was sprayed from the spray nozzle in 8 seconds to perform rinsing. Rinsing water was used without circulation. The washed dish was colored with a 1% by weight aqueous solution of erythrosin dye and judged according to the following criteria.

Judgment Criteria ◎: No coloring marks were observed, and the dirt was completely removed. ○: Slight coloring marks were observed, but most of the dirt was removed. Residual X: Mostly colored marks are observed, and only a few are removed.

  In Examples 1-1 to 1-3, good detergency was obtained with a washing time of 1 minute and 2 minutes. However, the cleaning effect was hardly exhibited in the cleaning time of Comparative Example 1-1 at 5 seconds. In Comparative Examples 1-2 to 1-3, the washability was poor even at 1 minute and 2 minutes. As a reference example, good cleaning performance was obtained by extending the cleaning time to 5 minutes. However, in the case of business use with a very large number of cleaning operations, it is inefficient and cannot be put into practical use.

<Example 2>
The supply evaluation of the cleaning composition was performed by an automatic supply device. That is, 1 kg of the detergent composition of the product 10 of the present invention in Table 1 is filled in a dedicated hopper (EW-9000 manufactured by Kao Corporation), and the detergent composition concentration is set to 0.1% by weight in advance. Then, using an automatic supply apparatus (KPR-2000 manufactured by Kao Corporation) with the alarm system turned on, it was supplied to a door-type commercial dishwasher (SANYO DR53 manufactured by Sanyo Electric Co., Ltd.).

  (1) A set of 10 model dirt dishes used in Example 1 in a dedicated rack, (2) 1 minute cleaning with a cleaning solution at 60 ° C. (use the cleaning solution circulated at a flow rate of 280 L / min), ( 3) Rinsing for 8 seconds (using rinse water of 2.6 L of 80 ° C. without circulating it) and (4) taking out 10 plates after rinsing were performed as 200 cycles continuously.

  As a result, in the cleaning operation of 200 cycles, there is no adjustment or operation by human hands other than the removal of the dish after rinsing during the cleaning, and an appropriate cleaning agent concentration can be obtained without any alarm. Maintained automatically. This alarm system emits an alarm warning sound when a state of less than 0.08% by weight continues for 5 minutes or more.

Claims (10)

(A) Alkali agent 50 to 80% by weight, (B) Organic phosphonate having an amino group 0.5 to 10% by weight, (C) Low-foaming nonionic surfactant represented by the following general formula (1) Silica alkali metal salt (M is an alkali metal) containing 0.5 to 5% by weight and (A) is (A1) M ₂ O / SiO ₂ = 1 / 1-1 / 3 ( molar ratio ) and ( A2) Including an alkali metal carbonate, (A1) / (A2) = 1 / 0.2 to 1/2 (weight ratio), (A) / (B) = 5 to 30 (weight ratio) A method for washing dishes, wherein the dishes are washed with a cleaning solution prepared from the cleaning composition in 10 seconds to 3 minutes.
HO- (PO) x- (EO) y- (PO) zH (1)
[In the formula, EO represents an oxyethylene group, PO represents an oxypropylene group, x and z represent the average number of added moles of propylene oxide, both are numbers greater than 0, and x + z is a number from 10 to 50. , Y represents the average number of moles of ethylene oxide added and is a number from 2 to 50. ] The method for washing dishes according to claim 1, wherein the dishes are washed using an automatic dishwasher. The method for cleaning tableware according to claim 1 or 2, wherein the tableware is continuously cleaned by circulating the cleaning liquid. The method for washing dishes according to claim 2 or 3, wherein the dishes are washed using an automatic dishwasher, and the cleaning composition is supplied to the automatic dishwasher using an automatic feeder. Cleaning in the cleaning liquid using an automatic supply device having means for detecting the concentration of the cleaning composition in the cleaning liquid and means for supplying the cleaning composition to the cleaning liquid in relation to the concentration of the cleaning composition in the cleaning liquid The method for washing dishes according to claim 3 or 4, wherein the concentration of the agent composition is maintained at a predetermined amount. The said cleaning composition contains the (D) polymeric carboxylic acid or its salt further, The cleaning method of the tableware in any one of Claims 1-5. (B) The organic phosphonate having an amino group is a sodium salt or potassium salt of an organic phosphonic acid selected from aminotri (methylenephosphonic acid), ethylenediaminetetra (methylenephosphonic acid), and diethylenetriaminepenta (methylenephosphonic acid). The method for cleaning tableware according to any one of claims 1 to 6. The cleaning method for tableware according to any one of claims 1 to 7 , wherein the concentration of the cleaning composition in the cleaning liquid is 0.04 to 0.5% by weight . (D) Polyacrylic acid having a weight average molecular weight of 2,000 to 15,000 or a salt thereof and an acrylic acid-maleic acid copolymer having a weight average molecular weight of 5,000 to 80,000 or a salt thereof. The cleaning method for tableware according to any one of claims 6 to 8, wherein the cleaning method is one or more selected from the group consisting of: (A) Alkali agent 50 to 80% by weight, (B) Organic phosphonate having an amino group 0.5 to 10% by weight, (C) Low-foaming nonionic surfactant represented by the following general formula (1) Silica alkali metal salt (M is an alkali metal) containing 0.5 to 5% by weight and (A) is (A1) M ₂ O / SiO ₂ = 1 / 1-1 / 3 ( molar ratio ) and ( A2) Including an alkali metal carbonate, (A1) / (A2) = 1 / 0.2 to 1/2 (weight ratio), (A) / (B) = 5 to 30 (weight ratio) Tableware cleaning composition.
HO- (PO) x- (EO) y- (PO) zH (1)
[In the formula, EO represents an oxyethylene group, PO represents an oxypropylene group, x and z represent the average number of added moles of propylene oxide, both are numbers greater than 0, and x + z is a number from 10 to 50. , Y represents the average number of moles of ethylene oxide added and is a number from 2 to 50. ]