JP5965801B2 - Cleaning agent, cleaning agent for food production equipment cleaning or dish cleaning and cleaning method - Google Patents

Description

  The present invention relates to a cleaning agent and a cleaning method.

For cleaning of various equipment such as equipment, pipes and parts used in the field of food production, etc., an alkaline detergent mainly composed of sodium hydroxide, a detergent mixed with an alkali agent and hypochlorite, phosphorus Acid cleaning agents that use acids and the like have been used depending on the quality of the soil and the object to be cleaned.
As a cleaning method for various devices, for example, a decomposition cleaning method or a stationary cleaning method is selected according to the scale of the equipment, equipment conditions, and the like. The in-place cleaning method is called CIP cleaning method (Clean In Place), and without disassembling a large-scale manufacturing device or line, the cleaning agent is put inside the compounding pot or piping in contact with raw materials and products. In this method, the cleaning liquid is sprayed or distributed.

In general, proteins tend to adhere to various devices, and proteins dispersed in a cleaning solution have a problem that they tend to foam. For this reason, when washing | cleaning the various apparatuses used for manufacturing the foodstuff etc. which contain protein, the washing | cleaning power with respect to protein is high, and the detergent which is hard to foam (foam suppression property) is calculated | required. In particular, in the CIP cleaning method, it is important that bubbles do not overflow from the equipment when the cleaning liquid is circulated.
Conventionally, as a cleaning agent for the various devices, a cleaning agent in which alkali and hypochlorite are mixed has been used at a low concentration in consideration of the disposal of the cleaning liquid. It was not possible to satisfy all of the problems associated with conventional cleaning agents, such as foam suppression during cleaning and problems with the use of hypochlorite.
In order to deal with such problems, for example, a method of cleaning dishes and the like with ultrasonic waves using a composition having a specific interfacial tension has been proposed (for example, Patent Document 1).

Japanese translation of PCT publication No. 2002-530484

However, it is difficult to apply the invention of Patent Document 1 to a large-scale manufacturing apparatus, and the objects to be cleaned are limited. In addition, in the invention of Patent Document 1, the cleaning power with respect to the various devices, particularly the cleaning power with respect to protein stains, has not been sufficient.
Then, this invention aims at the cleaning agent which is excellent in foam suppression property and detergency.

 The cleaning agent of the present invention contains (A) component: decyl sulfate and (B) component: condensed phosphate, and the mass ratio represented by (A) component / (B) component is 3. / 97 to 30/70. Furthermore, the component (C) contains at least one selected from 2-ethylhexanoic acid or an alkali metal salt thereof, methyl paraoxybenzoate, propylene glycol, benzoic acid or an alkali metal salt thereof, and the component (A) / It is preferable that mass ratio represented by the said (C) component is 5-50.

 The cleaning method of the present invention is characterized in that cleaning is performed using a cleaning liquid containing the cleaning agent of the present invention. The cleaning liquid preferably contains ozone.

  According to the cleaning agent of the present invention, it is excellent in foam suppression and cleaning power.

It is a schematic diagram of the washing | cleaning apparatus used for the evaluation method of washing power. It is a schematic diagram of the washing | cleaning apparatus used for the evaluation method of foam suppression. It is a schematic diagram of the washing | cleaning apparatus used for the evaluation method of sterilization power.

(Washing soap)
The cleaning agent of the present invention contains (A) component: decyl sulfate and (B) component: condensed phosphate.

The cleaning agent may be a liquid or a solid such as a granule, a tablet, a briquette, a sheet, or a bar.
In the case of a liquid cleaning agent (hereinafter sometimes referred to as a liquid cleaning agent), it may be a one-component type in which both the component (A) and the component (B) are mixed in the dispersion medium, or the component (A) It may be a two-component type consisting of a first liquid containing the second liquid containing the component (B).
Examples of the one-component liquid detergent include a concentrated type that is diluted with water at the time of use, and a straight type that is used without being diluted with water.

 The pH of the concentrated liquid detergent is not particularly limited, but is preferably 6 to 8, for example, and more preferably 6.5 to 7.5. If it is in the said range, liquid stability can be improved. The pH is a value measured at 25 ° C. using a pH meter.

The pH of the straight type liquid detergent is not particularly limited, but is preferably 6 to 8.5, and more preferably 6.5 to 8, for example. If it is in the said range, the further improvement of the detergency with respect to protein dirt can be aimed at.
The viscosity of the straight type liquid detergent is not particularly limited, but is preferably 10 mPa · s or less, for example. If it is below the above-mentioned upper limit, foam improvement can be further improved.

 In the case of a solid cleaning agent (hereinafter sometimes referred to as a solid cleaning agent), the component (A) and the component (B) may be mixed, and the component (A) and the component (B) Each may be prepared as a separate granular material.

<(A) component: Decyl sulfate>
(A) A component is a decyl sulfate and is an anionic surfactant obtained by sulfating decyl alcohol. The component (A) acts as a cleaning component that disperses protein stains in the cleaning liquid and suppresses foaming derived from the protein dispersed in the cleaning liquid.

The decyl group of component (A) may be linear or branched.
Examples of the counter ion of sulfate include alkali metals such as sodium and potassium, alkanolamines such as monoethanolamine, diethanolamine and triethanolamine, and ammonium. Among them, alkali metals are preferable, and sodium and potassium are more preferable. preferable. With such a counter ion, the detergency against protein soil can be further enhanced while maintaining good foam suppression.

Examples of the component (A) include sodium decyl sulfate (reagent) manufactured by Kanto Chemical Co., Ltd. and POLYSTEP B-25 (trade name) manufactured by Stepan.
(A) A component may be used individually by 1 type and may be used in combination of 2 or more type.

<(B) component: condensed phosphoric acid (salt)>
The component (B) is condensed phosphoric acid or condensed phosphate (generally condensed phosphoric acid (salt)). A cleaning agent exhibits the outstanding detergency with respect to stain | pollution | contamination, especially protein stain | pollution | contamination by containing (A) component and (B) component.

Examples of the component (B) include pyrophosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, pentapolyphosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, hexametaphosphoric acid, and salts thereof. Examples of the counter ion of the condensed phosphate include alkali metals such as sodium and potassium. With such a counter ion, the detergency against protein soil can be further increased.
As the component (B), metaphosphate and polyphosphate are preferable, and hexametaphosphate is more preferable.
Examples of the component (B) include sodium tripolyphosphate manufactured by Taihei Chemical Industrial Co., Ltd. and phosphorus chemical industrial corporation, sodium hexametaphosphate manufactured by Taihei Chemical Industrial Co., Ltd., and the like.
These (B) components may be used individually by 1 type, and may be used in combination of 2 or more type.

 The mass ratio represented by component (A) / component (B) in the cleaning agent (hereinafter sometimes referred to as A / B ratio) is 3/97 to 30/70, and 5/95 to 20/80. Is preferred. When the A / B ratio is less than the above lower limit, the component (A) is too small, and protein stains cannot be dispersed well in the washing solution, and foaming caused by the protein dispersed in the washing solution cannot be suppressed well. If it exceeds the upper limit, the content of the component (A) becomes too large, and the foam suppression of the component (A) itself cannot be exhibited.

The total amount of the components (A) and (B) in the cleaning agent (hereinafter sometimes referred to as AB total amount) is appropriately determined in consideration of the dosage form of the cleaning agent and the like.
For example, the total amount of AB in the concentrated liquid cleaning agent is preferably 2 to 20% by mass, and more preferably 4 to 17% by mass. If it is more than the said lower limit, transportation efficiency can be improved and it is not necessary to make a storage space too wide. If it is below the said upper limit, liquid stability can be improved more.

 The total amount of AB of the straight type liquid detergent is, for example, preferably 10 to 1000 mg / L, and more preferably 50 to 500 mg / L. If it is less than the lower limit, the cleaning power may be reduced, and if it exceeds the upper limit, foam suppression may be reduced.

 The total amount of AB in the solid detergent is appropriately determined in consideration of solubility in water and the like.

<(C) component: 1 or more types selected from 2-ethyl hexanoic acid or its alkali metal salt, methyl paraoxybenzoate, propylene glycol, benzoic acid or its alkali metal salt>
The cleaning agent may contain at least one selected from the component (C): 2-ethylhexanoic acid or an alkali metal salt thereof, methyl paraoxybenzoate, propylene glycol, benzoic acid or an alkali metal salt thereof.
When the cleaning agent is a liquid cleaning agent, by containing the component (C), the liquid stability when stored at a low temperature (for example, 5 ° C. or less) (hereinafter sometimes referred to as low-temperature storage stability) is enhanced. It is done. Moreover, the low-temperature storage stability of the washing | cleaning liquid containing a cleaning agent can be improved by containing (C) component.

Examples of 2-ethylhexanoic acid or an alkali metal salt thereof include 2-ethylhexanoic acid, sodium 2-ethylhexanoate, potassium 2-ethylhexanoate, and the like. With such a salt, the low-temperature storage stability can be further improved.
Examples of benzoic acid or alkali metal salts thereof include benzoic acid, sodium benzoate, and kalim benzoate.

 The content of the component (C) in the liquid detergent is a mass ratio represented by (A) component / (C) component (hereinafter sometimes referred to as A / C ratio), and is, for example, 5-50. An amount is preferable, and an amount of 10 to 30 is more preferable. If the A / C ratio is less than the above lower limit value, the liquid detergent may be easily frozen, and if it exceeds the above upper limit value, the blending balance with the component (A) may be lost and separated.

<Other ingredients>
In consideration of the dosage form and the like, the cleaning agent, in addition to the components (A) to (C), a surfactant other than the component (A), a dispersion medium, a disinfectant, a detergency builder, a pH adjuster, etc. It may contain.

Although it does not specifically limit as surfactant (arbitrary surfactant) other than (A) component, The thing which is hard to foam, such as polyoxyethylene hydrogenated castor oil (the average added mole number of ethylene oxide is 20-100), is preferable.
The content of the optional surfactant in the cleaning agent is appropriately determined according to the type of the optional surfactant. For example, when polyoxyethylene hydrogenated castor oil (average added mole number of ethylene oxide is 20 to 100) is used as the optional surfactant, the content of the optional surfactant in the cleaning liquid is preferably 100 mg / L or less.

Examples of the dispersion medium include water, ethanol, or a mixed solution thereof.
Examples of the disinfectant include hypochlorites such as sodium hypochlorite. However, it is preferable that the cleaning agent does not contain hypochlorite from the viewpoint of preventing corrosion of the object to be cleaned and considering the work environment.

(Production method of cleaning agent)
A cleaning agent is manufactured by a conventionally well-known manufacturing method according to a dosage form etc.
As a manufacturing method of a liquid detergent, for example, the components (A) to (B) and other components as necessary are dispersed in a part of the dispersion medium, adjusted to an arbitrary pH, and then the remainder of the dispersion medium is removed. The method of adding is mentioned.
As a solid cleaning agent, the method etc. which mix (A)-(B) component and another component as needed, and grind | pulverize this are mentioned, for example.

(how to use)
Any cleaning agent may be used as long as the cleaning liquid containing the cleaning agent is brought into contact with the object to be cleaned.
For example, the objects to be cleaned (devices, equipment, pipes, etc.) are disassembled, and each is immersed in a cleaning liquid for an arbitrary period of time (immersion cleaning method), or the cleaning liquid is sprayed on various disassembled equipment (injection cleaning method), then water And a decomposing cleaning method such as rinsing.
Alternatively, the cleaning liquid may be used for the CIP cleaning method.

The object to be cleaned is not particularly limited. The cleaning agent can be applied to any device, such as a device used in the food manufacturing field, a pipe or component, tableware, or a device that processes a raw material containing protein outside the food manufacturing field.
The material of the object to be cleaned is not particularly limited, and examples thereof include metals such as stainless steel and aluminum, ceramics, glass, concrete, and plastics.

An example of the cleaning liquid is a cleaning liquid in which a cleaning agent is dispersed in a dispersion medium such as water.
The content of the cleaning agent in the cleaning liquid is appropriately determined according to the dosage form of the cleaning agent, and is preferably an amount such that the total amount of AB in the cleaning solution is 10 to 1000 mg / L, and the total amount of AB is 50 to 500 mg. The amount of / L is more preferable. If it is less than the lower limit, the cleaning power may be reduced, and if it exceeds the upper limit, foam suppression may be reduced.
The viscosity of the cleaning liquid is not particularly limited, but is preferably 10 mPa · s or less, for example. If it is below the above-mentioned upper limit, foam improvement can be further improved.
For example, the pH of the cleaning liquid is preferably 6 to 8.5, and more preferably 6.5 to 8. If it is in the said range, the further improvement of a cleaning power can be aimed at.

The cleaning liquid preferably contains ozone. By containing ozone, the object to be cleaned can be sterilized while being cleaned.
Ozone in the cleaning liquid may exist as bubbles in the cleaning liquid, or may be dissolved in the cleaning liquid.

When ozone is present as bubbles in the cleaning liquid, it is preferable that ozone be microbubbles having a bubble diameter of 200 μm or less.
Examples of the method for generating microbubbles include a method in which a gas containing ozone (ozone-containing gas) is mixed with a cleaning liquid using a pressure-dissolving microbubble generator and a two-phase swirl microbubble generator, and porous. Examples thereof include a method of sending an ozone-containing gas into the cleaning liquid through a porous material, a method of mixing the cleaning liquid and the ozone-containing gas with an ejector or a venturi tube, and the like.

 The pressure-dissolving microbubble generator creates a supersaturated condition of the dissolved ozone-containing gas by dissolving a sufficient amount of ozone-containing gas in the cleaning liquid at a pressure higher than atmospheric pressure and then reducing the pressure. As a result, the excessively dissolved ozone-containing gas becomes unstable, and the supersaturated ozone-containing gas tends to jump out of the cleaning liquid. As a result, a large amount of microbubbles of ozone-containing gas are generated in the cleaning liquid.

 The two-phase flow swirl type microbubble generator is a microbubble generator generally used. This device generates microbubbles by generating a vortex by a water flow, entraining ozone-containing gas in the vortex with a large bubble, and subdividing the bubble when the vortex is collapsed. There are many methods for generating vortices, which are commercially available as various types of microbubble generators.

 The method of blowing the ozone-containing gas into the cleaning liquid through the porous material reduces the surface tension of the cleaning liquid by the surface activity of the component (A), expands the gas-liquid contact area of the blown ozone-containing gas, It generates bubbles of ozone-containing gas. When ozone-containing gas is blown into the cleaning liquid through the porous material, the surface tension that balances the buoyancy of the generated bubbles is reduced, and the bubbles rise with smaller bubbles than when the component (A) is not included. Can be generated.

In the method using an ejector or a venturi tube, the ozone-containing gas is sheared by a water flow in the gas-liquid mixing part, and forms more gas-liquid interfaces in the aqueous solution whose surface tension is reduced by the component (A). Generates microbubbles.
In the present invention, the microbubble generation method provides a sufficient effect regardless of which of the above methods is used.

 In the case of using a cleaning liquid containing ozone as bubbles, for example, a cleaning liquid containing ozone may be prepared, and the object to be cleaned may be cleaned using this, or the object to be cleaned may be added to a cleaning liquid not containing ozone. The ozone-containing gas may be aerated in the cleaning liquid while being immersed.

Methods for dissolving ozone in the cleaning liquid are roughly classified into a method for generating ozone in the cleaning liquid and a method for dissolving ozone-containing gas in the cleaning liquid.
As a method for generating ozone in the cleaning liquid, an electrolysis method is the most common.
As a method of dissolving the ozone-containing gas in water, ozone is generated by ultraviolet irradiation, discharge or radiation irradiation, and the cleaning liquid is aerated with the ozone-containing gas containing ozone, and the ozone-containing gas is made into the cleaning liquid using a diffuser. Examples thereof include a method of aeration or a method of dissolving an ozone-containing gas in a cleaning liquid through a polytetrafluoroethylene film or the like.

The concentration of ozone in the ozone-containing gas is not particularly limited, but is preferably 10,000 ppm by volume or less, more preferably 7500 ppm by volume or less in consideration of the working environment. Although a lower limit is not specifically limited, 10 volume ppm or more is preferable and 100 volume ppm or more is more preferable from a viewpoint of containing ozone efficiently in a washing | cleaning liquid.
INDUSTRIAL APPLICABILITY The present invention is useful because an effective bactericidal effect is obtained at room temperature in an aeration process using an ozone-containing gas having an ozone concentration of 100 to 7500 volume ppm.

 The method of adding ozone to the cleaning liquid is not limited to the method of aeration of the ozone-containing gas into the cleaning liquid in which the cleaning agent is dispersed in the dispersion medium. After the ozone is added to the dispersion medium in advance, the cleaning agent is added thereto. It may be dispersed.

 As above-mentioned, since the cleaning agent of this invention contains (A) component and (B) component, it is excellent in foam suppression property and detergency. The cleaning agent of the present invention is particularly excellent in detergency against protein stains and can suppress foaming derived from protein. Therefore, a member that comes into contact with a protein-containing raw material or product, such as food production equipment or tableware, is used. Suitable for cleaning. In addition, since the cleaning agent of the present invention has excellent antifoaming properties, it is suitable as a cleaning agent for CIP cleaning.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated in detail, this invention is not limited by the following description.

(Raw materials used)
<(A) component>
A-1: Sodium decyl sulfate (Na (C10AS), sodium n-decyl sulfate, reagent, manufactured by Kanto Chemical Co., Inc.).
<(A ′) component: Comparative product of component (A)>
A′-1: sodium dodecyl sulfate (C12AS, reagent, manufactured by Wako Pure Chemical Industries, Ltd.).
A′-2: Sodium octyl sulfate (manufactured by Kanto Chemical Co., Inc.).

<(B) component>
B-1: Sodium hexametaphosphate (manufactured by Taihei Chemical Industrial Co., Ltd.).
B-2: Sodium tripolyphosphate (manufactured by Taihei Chemical Industrial Co., Ltd.).
<(B ′) component: Comparative product of component (B)>
B′-1: Sodium phosphate (reagent, manufactured by Wako Pure Chemical Industries, Ltd.).
B′-2: Trisodium citrate (reagent, manufactured by Wako Pure Chemical Industries, Ltd.).

<(C) component>
C-1: 2-ethylhexanoic acid (reagent, manufactured by Wako Pure Chemical Industries, Ltd.).
C-2: Methyl paraoxybenzoate (reagent, manufactured by Kanto Chemical Co., Inc.).
C-3: Propylene glycol (reagent, manufactured by Kanto Chemical Co., Inc.).
C-4: Sodium benzoate (reagent, manufactured by Kanto Chemical Co., Inc.).
<(C ′) component: Comparative product of component (C)>
C′-1: ethyl paraoxybenzoate (reagent, manufactured by Kanto Chemical Co., Inc.).
C′-2: Polyethylene glycol (reagent, molecular weight 400, manufactured by Kanto Chemical Co., Inc.).

<Optional component>
pH adjuster: sodium hydroxide (manufactured by Kanto Chemical Co., Inc.).
pH adjuster: sulfuric acid (manufactured by Kanto Chemical Co., Inc.).
Water: Ion exchange water.

(Examples 1-1 to 1-18, Comparative Examples 1-1 to 1-9)
According to the composition of Tables 1-3, each raw material except a pH adjuster and a part of water were mixed, and the pH adjuster was added to this to make pH 7.2. Subsequently, the remainder of water was added and the cleaning agent of each case was obtained. About the obtained cleaning agent, a cleaning power, foam suppression property, and low-temperature storage stability were evaluated, and the result is shown in a table | surface.
The composition in the table is a pure conversion amount, and the “balance” in water is an amount necessary to make the cleaning agent 100% by mass.

(Evaluation method)
<Detergency>
≪Manufacture of dirt board≫
One egg (50 g) was placed in a 200 mL glass beaker, stirred for 5 minutes with a stir bar, and then filtered through a polyamide mesh (60 mesh). The filtrate was placed in a 50 mL vial, and a test piece (SUS304, width 25 mm, length 75 mm, thickness 1 mm, No. 400 buffing) was immersed therein and pulled up. At this time, the length direction of the test piece was set to the vertical direction, and the test piece was immersed in the filtrate to the middle of the length direction. After repeating this three times, the test piece was suspended with the length direction as the vertical direction, and dried for 18 hours in a temperature-controlled room with a room temperature of 23 ° C. and a humidity of 40% to obtain a dirt plate. On the obtained dirt plate, a part immersed in the filtrate and attached with the dirt (contaminated part) and a part not immersed in the filtrate and attached with the dirt (clean part) were formed.

≪Cleaning test≫
The said dirt board was wash | cleaned using the washing | cleaning apparatus 1 of FIG. 1, and the cleaning power was evaluated.
The cleaning device 1 includes a storage tank 10, a cleaning tank 20, a stirrer 22, and a pump 40. A cleaning tank 20 is provided above the storage tank 10, and a stirrer 22 is provided so that the inside of the cleaning tank 20 can be stirred. The storage tank 10 is connected to the pump 40 via a pipe 42, and the cleaning tank 20 is connected to the pump 40 via a pipe 44.
The storage tank 10 was a bottomed cylindrical polypropylene container having a capacity of 5000 mL, and the cleaning tank 20 was a bottomed cylindrical polypropylene container having a capacity of 500 mL.
The stirrer 22 includes a drive unit 26 and a stirring blade 24 (blade length 30 mm, four inclined blades), and a three-one motor was used for the drive unit 26. A sealless pump (manufactured by Elepon Processing Machine Co., Ltd.) was used for the pump 40, and a silicon tube (outer diameter 6 mm) was used for the piping 42 and the piping 44.

The cleaning agent of each example was diluted 500 times (volume basis) with tap water at 20 ° C., and an appropriate amount of sodium hydroxide was added to prepare 3000 mL of a pH 7.4 cleaning solution.
The prepared cleaning liquid was put in the storage tank 10, the pump 40 was started, and the cleaning liquid 30 in the storage tank 10 was allowed to flow into the cleaning tank 20 through the pipe 42, the pump 40, and the pipe 44 in this order. When the cleaning liquid 30 was filled in the cleaning tank 20, the cleaning liquid 30 in the cleaning tank 20 overflowed from the opening of the cleaning tank 20 and flowed into the storage tank 10. Thus, the cleaning liquid 30 in the storage tank 10 was circulated in the order of the pipe 42, the pump 40, the pipe 44, the cleaning tank 20, and the storage tank 10.
The stirrer 22 was activated, and two dirt plates were placed in the cleaning tank 20 while stirring the cleaning liquid 30 in the cleaning tank 20 (the rotation speed of the stirring blade 24 was 150 rpm). At this time, the contaminating part 54 is vertically downward, the cleaning part 52 is vertically upward, and the boundary 56 between the cleaning part 52 and the contaminating part 54 is below the liquid level of the cleaning liquid 30 in the cleaning tank 20. The dirt plate 50 was placed in the cleaning tank 20 so that
After the cleaning liquid 30 was circulated (cleaning process) for 20 minutes, the two dirt plates 50 were taken out and vertically immersed in a polypropylene beaker containing 1500 mL of tap water at 20 ° C. (rinsing process). . After this rinsing process was repeated five times, the dirt plate 50 was stood on a stainless steel bat having a width of 250 mm, a length of 400 mm, and a height of 50 mm and naturally dried. The dirt plate 50 was visually evaluated according to the following evaluation criteria. A score of 4 or more was evaluated as “excellent detergency”.

≪Evaluation criteria≫
5 points: No dirt remains.
4 points: A slight boundary line between the contaminated part and the clean part remains, and no dirt remains in other parts.
3 points: The boundary line between the contaminated part and the clean part remains clearly, but no dirt remains in other parts.
2 points: The boundary line between the contaminated part and the clean part remains clearly, and the other parts remain slightly dirty.
1 point: almost no dirt

<Foam suppression>
The foam suppression property was evaluated using the cleaning apparatus 100 of FIG.
The cleaning apparatus 100 includes a storage tank 110, a pump 120, a pump 130, and a hopper 140.
A nozzle 144 is provided inside the hopper 140, and the nozzle 144 is connected to a pressure gauge 146 through a pipe 148. A pipe 142 is provided at the bottom of the hopper 140, and the pipe 142 is connected to the pump 130. An inverter 132 is electrically connected to the pump 130, and the pump 130 is connected to the storage tank 110 through a pipe 136. The storage tank 110 is connected to the pump 120 through a pipe 112 provided with a flow meter 114, and the pump 120 is connected to the pipe 148 through a pipe 122.
A 6000 mL capacity polypropylene container (diameter 190 mm, height 230 mm) was used for the storage tank 110, and LW20-PTN (Horiba Estec Co., Ltd.) was used for the flow meter 114. A vortex pump (manufactured by Nikuni Co., Ltd.) was used as the pump 120, and a spiral pump (Lacie RMD-701, manufactured by Iwaki Co., Ltd.) was used as the pump 130. FR-FS-0.8K (manufactured by Mitsubishi Electric Corporation) was used for the inverter 132, and HTF-ST-21 (made of stainless steel, Sanhiro Astec Co., Ltd.) was used for the hopper 140. ES01 (manufactured by Ikeuchi Co., Ltd.) was used for the nozzle 144, and a Bourdon tube pressure gauge (manufactured by MonotaRO Co., Ltd.) was used for the pressure gauge 146. As the pipes 112, 122, 136, 142, and 148, 15A SUS304 pipes were used.

Chicken eggs were placed in a beaker and stirred for 5 minutes with a stir bar, and then filtered through a polyamide mesh (60 mesh). The chicken egg filtrate was dispersed in a cleaning solution obtained by diluting the cleaning agent with tap water 500 times (volume basis) to obtain a cleaning solution having a content of chicken eggs of 0.1% by mass.
5000 mL (20 ° C.) of this cleaning liquid was put in the storage tank 110. The pumps 120 and 130 were started, and the cleaning liquid 102 in the storage tank 110 was passed through the pipe 112, the pump 120, the pipe 122, and the pipe 148 in this order, and injected into the hopper 140 by the nozzle 144 (0.05 MPa). At this time, the pump 120 has a flow rate of 2.3 L / min. The pump 130 was operated at 27 Hz.
The cleaning liquid in the hopper 140 was sucked by the pump 130 and flowed into the storage tank 110 through the pipe 136.
The above operation was performed for 5 minutes, and the height of bubbles generated in the storage tank 110 was measured. The measured foam height was classified into the following evaluation criteria, and the foam suppression property was evaluated. A foam having a foam height of 5 cm or less was judged to have good foam suppression.

≪Evaluation criteria≫
A: The height of the foam is 3 cm or less.
◯: The height of the foam exceeds 3 cm and is 5 cm or less.
(Triangle | delta): The height of a bubble exceeds 5 cm and is 10 cm or less.
X: The height of a bubble exceeds 10 cm.

<Low temperature storage stability>
40 g of the cleaning agent of each example was placed in a 50 mL hard glass vial and covered with a polyethylene cap to prepare a sample for storage. The sample for preservation | save was preserve | saved with the 0 degreeC thermostat. The appearance of the cleaning agent after 10 days, 20 days and 30 days after the start of storage was visually observed and evaluated according to the following evaluation criteria. Those with “◯” or “◎” were judged to have good low-temperature storage stability.

≪Evaluation criteria≫
A: Freezing and separation are not observed after 30 days.
○: Neither freezing nor separation was observed after 20 days, but freezing or separation was observed after 30 days.
Δ: Neither freezing nor separation was observed after 10 days, but freezing or separation was observed after 20 days.
X: Freezing or separation was observed within 10 days.

(Example 2-1)
1 part by weight of sodium decyl sulfate (component (A)), 9 parts by weight of sodium metaphosphate (component (B)), 0.1 part by weight of methyl parahydroxybenzoate (component (C)), 5 parts by mass and 89.4 parts by mass of ion-exchanged water were mixed in a beaker to obtain the cleaning agent of this example. The pH of this cleaning agent was 7.2. About the obtained cleaning agent, bactericidal power was evaluated according to the following "<Method for evaluating bactericidal power>".

<Method for evaluating sterilizing power>
The sterilizing power was evaluated using the cleaning device 200 shown in FIG. 3. The cleaning device 200 includes a storage tank 210, a pump 220, a mass flow controller 230, an ozone gas monitor 240, an ozone generator 250, and an air cylinder 260. Is provided.
The storage tank 210 is connected to the pump 220 through a pipe 222 and a pipe 224. An ejector 226 is provided in the pipe 224, and a pipe 232 is connected to the ejector 226. The pipe 232 is connected to the mass flow controller 230, and the mass flow controller 230 is connected to the ozone gas monitor 240 through the pipe 242. The ozone gas monitor 240 is connected to the ozone generator 250 through a pipe 252, and the ozone generator 250 is connected to the air cylinder 260 through a pipe 262.
A 5000 mL capacity polypropylene container (diameter 180 mm, height 220 mm) was used for the storage tank 210, and a sealless pump (manufactured by Elepon Processing Co., Ltd.) was used for the pump 220. The ejector 226 was made of tetrafluoroethylene, and the mass flow controller 230 was Model 8500 (Coffrock Co., Ltd.). For the ozone gas monitor 240, EG-600 (manufactured by Sugawara Jitsugyo Co., Ltd.) was used, and for the ozone generator 250, OZSD-3000A (manufactured by Hagiwara Jitsugyo Co., Ltd.) was used. Tetrafluoroethylene tubes (inner diameter 4 mm, outer diameter 6 mm) were used for the pipes 222, 224, 232, 242, 252, and 262.

The cleaning agent was diluted 500 times (volume basis) with sterilized tap water to obtain 3000 mL of cleaning solution (pH 6.8). Escherichia coli (E. coli, NBR3982, Gram-negative bacteria) transplanted and cultured twice at 37 ° C. for 24 hours in a standard agar medium was added to the washing solution, and the test solution (E. coli: 1.0 × 10 ⁶ cfu / mL) It was. This test solution was put in the storage tank 210.
The pump 220 is started, and the test solution 202 in the storage tank 210 is 2 L / min. In order of the pipe 222, the pump 220, the pipe 224, and the storage tank 210. Circulated at a flow rate of.
Air was supplied to the ozone generator 250 from the air cylinder 260 via the pipe 262, and ozone was generated by the ozone generator 250. The ozone-containing gas containing the generated ozone was passed through the pipe 252, the ozone gas monitor 240, the pipe 242, the mass flow controller 230, the pipe 232, and the ejector 226 in order, and the ozone-containing gas and the test liquid 202 were mixed by the ejector 226. At this time, the flow rate of the ozone-containing gas to the ejector 226 was 0.2 L / min. The ozone content of the ozone-containing gas was 1200 ppm by volume.
The test liquid 202 was circulated, and the inside of the storage tank 10 was aerated with ozone-containing gas for 20 minutes (aeration treatment).

 Immediately after the aeration treatment, 4.5 mL of a test solution was collected, and 0.5 mL of a 0.1N sodium thiosulfate aqueous solution was added thereto to obtain a measurement sample. 9 mL of sterilized physiological saline was added to 1 mL of this measurement sample and diluted 10 times (dilution treatment). Further, serial dilution was performed 10 times in the same manner as in the dilution treatment. 1 mL of each diluted solution was put in a petri dish, mixed with 10 mL of 50 ° C. SCD agar medium (manufactured by Nissui Pharmaceutical Co., Ltd.), and cooled to room temperature to solidify the SCD agar medium. After the solidified SCD agar medium was cultured at 37 ° C. for 24 hours in an incubator, the number of colonies on the medium was measured for those having 30 to 300 cfu per petri dish to examine the number of viable bacteria. A value obtained by multiplying the measured petri dish by the dilution rate at the time of serial dilution of the collected test solution and further multiplying by 10/9 was calculated as the number of remaining viable bacteria per 1 mL of the test solution. As a result, the number of remaining viable bacteria in the test solution after the aeration treatment was less than 30 cfu / mL.

(Comparative Example 2-1)
The number of remaining viable bacteria was determined in the same manner as in Example 2-1, except that the test solution was prepared without using the cleaning agent. As a result, the number of remaining viable bacteria in the test solution after the aeration treatment was on the order of 10 ⁴ cfu / mL.

 From the results of Example 2-1 and Comparative Example 2-1, it was found that the sterilizing power can be further enhanced by applying the present invention. In addition, even if Example 2-1 was aerated with ozone-containing gas, it was able to exhibit excellent foam suppression.

Claims (4)

(A) component: decyl sulfate and (B) component: condensed phosphate,
A cleaning agent for washing food production equipment or dishwashing, wherein the mass ratio represented by the component (A) / component (B) is 3/97 to 30/70. (A) Component: Decyl sulfate, (B) Component: condensed phosphate, (C) Component: 2-ethylhexanoic acid or its alkali metal salt, methyl paraoxybenzoate, propylene glycol, benzoic acid or its Containing one or more selected from alkali metal salts,
The mass ratio represented by the component (A) / component (B) is 3/97 to 30/70,
Wherein component (A) / the (C) washing the mass ratio represented by components you characterized in that 5 to 50 cleaning agent. A cleaning method comprising a cleaning agent for cleaning food production equipment according to claim 1 or a cleaning liquid containing the cleaning agent according to claim 2.   The cleaning method according to claim 3, wherein the cleaning liquid contains ozone.

Images