JP2016083651A - Washing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing method which is suitably used for decontamination of an architectural structure.SOLUTION: A washing method is configured to jet a washing agent comprising: water; a thickener for applying thixotropy to the washing agent and being included by 0.05-1 mass part to 100 mass parts of the water; and calcium carbonate powder included by 5 mass parts to 10 mass parts to 100 mass parts of the water, to a washing object with high temperature vapor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cleaning method, and more particularly to a cleaning method suitable for decontamination of a building or the like, that is, removal of contaminants attached to the surface of an object to be cleaned such as a building.

  For example, high-pressure cleaning in which high-pressure water is vigorously sprayed onto an object to be cleaned is used for cleaning dirt that is firmly attached to a wall surface of a building or a painted surface of an automobile. Moreover, the blast process which sprays powder on a washing | cleaning target object with water or air may be used.

  However, when a hard powder is used as the blasting medium in the blasting process, there is a problem in that the object to be cleaned is finely scratched. Further, depending on the object to be cleaned, it may be inappropriate to use a hard powder as a blasting medium. Furthermore, in the blasting process, the powder is scattered or flows out together with water and air. Therefore, it is difficult to collect the used powder and the removed dirt.

  The problem of minute scratches on the object to be cleaned and the problem of restrictions on use in the object to be cleaned are solved by using a soft powder such as calcium carbonate powder instead of a hard powder in the blasting process. .

  A method for operating a blasting apparatus using calcium carbonate powder or silica sand in blasting has been proposed (see, for example, Patent Document 1). In the blasting device described in Patent Document 1, a powder blast medium is stored, a tank in which a supply port for the blast medium is formed at a predetermined position, and a base end portion is connected to the supply port of the tank. A hose, a nozzle connected to the tip of the hose, a liquid supply unit connected to the base end of the hose and supplying liquid toward the supply point of the blast medium supplied from the supply port of the tank; A blasting apparatus using calcium carbonate powder as a blasting medium and blasting with a mass ratio of calcium carbonate powder to liquid of 6: 1 to 4: 1. It is disclosed.

JP 2009-166206 A

  However, when blasting is used for decontamination of buildings or the like, it is important not to cause sedimentation of the blasting medium.

  An object of the present invention is to provide a cleaning method in which sedimentation of calcium carbonate powder is effectively suppressed and used suitably for decontamination of buildings and the like.

  The 1st aspect of this invention is related with the washing | cleaning method, 0.05 weight part-1 weight part thickener which gives thixotropic property to a washing | cleaning agent with respect to 100 weight part of water, and 100 weight of water. A cleaning agent containing 5 parts by weight to 10 parts by weight of calcium carbonate powder is jetted toward the object to be cleaned together with high-temperature steam.

According to the cleaning method of the first aspect of the present invention, the precipitation of calcium carbonate powder is effectively suppressed, and it is suitably used for decontamination of buildings and the like. That is, the cleaning agent containing calcium carbonate powder can be suitably used for a cleaning method, and provides a cleaning method with good removal of contaminants attached to the surface of an object to be cleaned such as a building. .
Since the cleaning agent uses calcium carbonate powder as a powder, a high cleaning effect can be obtained even on a cleaning object having a fine uneven surface such as a mortar wall surface, and the cleaning object can be damaged. rare.

  Moreover, since the thickener which provides thixotropy to a cleaning agent is mix | blended, sedimentation of the calcium carbonate powder contained in a cleaning agent is suppressed. Further, when the cleaning agent is sprayed toward the object to be cleaned, it can remain attached to the surface of the object to be cleaned. Therefore, it is very easy to collect the cleaning agent after cleaning the cleaning object.

  In addition, since the cleaning agent is sprayed toward the object to be cleaned together with the high-temperature steam, a higher cleaning effect can be obtained as compared with the case where the cleaning agent is sprayed onto the object to be cleaned together with water or air.

  According to a second aspect of the present invention, in the cleaning method according to the first aspect, the thickener is selected from the group consisting of xanthan gum, tragacanth powder, guar gum, spino gum, sodium carboxymethylcellulose, and carboxyvinyl polymer. It is characterized by that.

  Xanthan gum, guar gum, and carboxyvinyl polymer used in the thickener are all thickeners that impart significant thixotropy to the detergent.

  A third aspect of the present invention is characterized in that the particle size of the calcium carbonate powder is 200 μm or less in the cleaning method of the first aspect or the second aspect.

  If the average particle diameter of the calcium carbonate powder used in the cleaning agent is within the above range, the object to be cleaned is rarely damaged and a high cleaning effect is obtained.

  According to a fourth aspect of the present invention, in the cleaning method according to any one of the first to third aspects, the object to be cleaned is an object to be cleaned whose surface is contaminated with a radioactive substance. The cleaning agent is jetted together with high-temperature steam toward the surface of the object to remove radioactive substances on the surface of the object to be cleaned.

  In the cleaning method, radioactive substances such as radioactive cesium on the surface of the object to be cleaned are removed from the object to be cleaned by the calcium carbonate powder in the cleaning agent and adsorbed on the calcium carbonate powder.

  Moreover, since the cleaning agent sprayed toward the object to be cleaned remains attached to the surface of the object to be cleaned, the cleaning agent contaminated with radioactive substances is recovered by collecting this cleaning agent. It is effectively prevented from escaping.

According to a fifth aspect of the present invention, in the cleaning method of the fourth aspect, the cleaning agent contains 0.1 to 1 part by weight of the thickening agent with respect to 100 parts by weight of water. To do.
When the cleaning agent contains 0.1 to 1 part by weight of the thickener, the thixotropy of the cleaning agent is improved, and the cleaning agent sprayed on the cleaning object depends on the surface of the cleaning object. It is maintained in a stably attached state.

  As described above, according to the present invention, there is provided a cleaning method in which sedimentation of calcium carbonate powder is effectively suppressed and used suitably for decontamination of buildings and the like.

It is the schematic which shows one Embodiment of the washing | cleaning apparatus of this invention. It is the elements on larger scale which show other embodiment of the washing | cleaning apparatus of this invention. It is a photograph which shows the mode before and after washing | cleaning when wash | cleaning a bathroom ceiling with the washing | cleaning apparatus of this invention, (A) is before washing | cleaning, (B) is a photograph after washing | cleaning. It is an expanded sectional view which shows the outline of another embodiment of the washing | cleaning apparatus using the steam cleaner used for this invention. It is a partial expansion perspective view of the washing | cleaning apparatus shown in FIG.

1. Cleaning Agent The main components of the cleaning agent used in the cleaning method of the present invention are water, calcium carbonate powder, and a thickener that imparts thixotropic properties to the cleaning agent. Hereinafter, each component of the cleaning agent and its content will be described.

The cleaning agent used in the cleaning method of the present invention contains calcium carbonate powder.
The content of the calcium carbonate powder in the cleaning agent is 5 to 10 parts by weight with respect to 100 parts by weight of water. When the content of calcium carbonate powder is less than 5 parts by weight with respect to 100 parts by weight of water, a sufficient cleaning effect can be obtained simply by spraying the cleaning agent together with the high-temperature steam described in detail below toward the object to be cleaned. It may not be obtained. On the other hand, when the content of the calcium carbonate powder exceeds 10 parts by weight, the detergency is almost the same as that when the calcium carbonate powder is 10 parts by weight, and it is difficult to obtain an improvement in the cleaning effect as the calcium carbonate powder content increases. In addition, when the surface is used for decontamination of an object to be cleaned contaminated with radioactive substances, there is a problem that the amount of calcium carbonate powder discharged as radioactive contaminants becomes excessive.

The cleaning agent used in the cleaning method of the present invention includes a thickener that imparts thixotropic properties to the cleaning agent.
The content of the thickener in the cleaning agent is 0.05 to 1 part by weight with respect to 100 parts by weight of water.
When the content of the thickener is less than 0.05 parts by weight with respect to 100 parts by weight of water, the calcium carbonate powder may settle inside the pump when the cleaning agent is fed by the pump in the cleaning device. There is. On the other hand, when the content of the calcium carbonate powder is as high as 10 parts by weight with respect to 100 parts by weight of water, if the thickener is blended in 1 part by weight with respect to 100 parts by weight of water, the calcium carbonate powder Therefore, it is considered that there is no point in adding a thickener in excess of 1 part by weight per 100 parts by weight of water.

  Moreover, for example, the content of the thickener in the cleaning agent can be 0.1 to 1 part by weight with respect to 100 parts by weight of water. By setting the content of the thickener in the cleaning agent to 0.1 parts by weight to 1 part by weight with respect to 100 parts by weight of water, the viscosity of the cleaning agent having thixotropy in a state where no shear force is applied. When the cleaning agent and the vapor are applied to the surface of the cleaning target, the cleaning agent tends to stay on the surface of the cleaning target. For this reason, when the object to be cleaned contains a radioactive substance, the content of the thickener is set within the preferred range described above, so that the scattering of the cleaning agent containing the radioactive substance is suppressed, and the pollutant after use is reduced. It becomes easier to collect the cleaning agent.

  Moreover, content of the thickener in a cleaning agent can be 0.05 weight part-0.8 weight part with respect to 100 weight part of water. By setting the content of the thickener in the cleaning agent to 0.05 parts by weight to 0.8 parts by weight with respect to 100 parts by weight of water, the viscosity of the cleaning agent having thixotropy can be suppressed to a low level. When steam is applied to the surface of the object to be cleaned, the cleaning agent can easily remove contaminants on the surface of the object to be cleaned. For this reason, the cleaning method of the present invention is also effective for the purpose of efficiently cleaning a normal object to be cleaned and removing contaminants.

  When using xanthan gum as a thickener contained in the cleaning agent, the content of xanthan gum is preferably 0.1 parts by weight to 0.8 parts by weight with respect to 100 parts by weight of water.

  Hereinafter, the calcium carbonate powder and the thickener used in the cleaning agent of the present invention will be described in detail.

  The particle size of the calcium carbonate powder is preferably 200 μm or less, and particularly preferably in the range of 1 to 200 μm. If the particle size of the calcium carbonate powder is 200 μm or less, it is preferable in that the object to be cleaned is less damaged as compared with the case where a calcium carbonate powder having a particle size exceeding 200 μm is used. On the other hand, if the particle size of the calcium carbonate powder is 1 μm or more, it is considered that a sufficient cleaning effect can be obtained simply by spraying the cleaning agent toward the object to be cleaned. The median particle size of the calcium carbonate powder is preferably 100 μm or less.

  The particle shape of the calcium carbonate powder is not particularly limited, such as a spindle shape, a column shape, a cube shape, an indefinite shape, etc., but a cube shape is preferable from the viewpoint that the object to be cleaned is difficult to be scratched, and a cube with rounded corners in particular. The shape is preferred.

The thickener is not particularly limited as long as the aqueous solution has thixotropic properties. By using such a thickener, thixotropy is imparted to the cleaning agent used in the cleaning method of the present invention.
Examples of such thickeners include xanthan gum, tragacanth powder, guar gum, spino gum, carboxymethylcellulose sodium, and carboxyvinyl polymer.
Among these thickeners, the yield value is high, the viscosity curve showing the change in viscosity with respect to the shear rate is steep, in other words, the fluidity is low when attached to the object to be cleaned, Despite the fact that it does not flow down even if it adheres to the wall, etc., it exhibits high fluidity when delivered in a cleaning device that injects cleaning agent and steam onto the object to be cleaned, and it is derived from natural products and is environmentally compatible Xanthan gum is the most preferable because of its high properties and the need for pH adjustment when preparing the detergent.

There is no restriction | limiting in particular in the manufacturing method of the cleaning agent used for the cleaning method of this invention.
As a method for producing a cleaning agent, for example, a thickener is added little by little while stirring water, and after dissolving and dissolving, a calcium carbonate powder is gradually added to an aqueous solution of the resulting thickener to disperse. And a method of mixing the calcium carbonate powder and the thickener to obtain a mixture, and then gradually adding the obtained mixture to water gradually while stirring the water to uniformly disperse the mixture. .

2. Cleaning device A cleaning device 1 used in the cleaning method of the present invention is a device using steam, and as shown in FIG. 1, a nozzle 10 having an injection port 10 </ b> A and high-temperature steam are supplied to the nozzle 10. The steamer 11 for carrying out and the injection pipe 12 opened in the center of 10 A of injection nozzles in the nozzle 10 are provided. In addition, a cleaning agent tank 13 for storing the cleaning agent supplied to the injection pipe 12, a connection line 14 connecting the cleaning agent tank 13 and the injection pipe 12, and a pressure pump interposed in the connection pipe 14 15.

  The steamer 11 boiles the water stored therein to form high-temperature steam, and supplies the high-temperature steam to the nozzle 10. In addition, as shown in FIG. 2, the cleaning device 1 may be configured by connecting the tip sleeve 16 of an existing separate steam cleaner to the nozzle 10 instead of the steamer 11.

  In FIG. 2, the end sleeve 16 of the steam cleaner is connected to the end portion (the right end portion of the nozzle 10 in FIG. 2) facing the injection port 10 </ b> A of the nozzle 10, and the side surface (lower side in FIG. 2 is perpendicular to the injection port 10 </ b> A). The injection pipe 12 is connected to the side surface. However, the injection pipe 12 may be connected to the end facing the injection port 10A, and the tip sleeve 16 of the steam cleaner may be connected to the side surface orthogonal to the injection port 10A.

Commercial products can be used as the steam cleaner. For example, the cleaning method of the present invention can be carried out using a steam cleaner canister type STM-415 (trade name) manufactured by Iris Ohyama Co., Ltd., which is a commercial product for household use.
Reference numeral 16 in FIG. 2 represents a straight nozzle that is a tip sleeve of the steam cleaner. As shown in FIG. 2, a nozzle 10 for injection, which is integrally provided with an injection pipe 12 for supplying a cleaning agent and an outlet 10A, is fitted to the tip of a tip end 16 of a steam cleaner and used as an injection device.
By forming an elastic tapered cylindrical layer, for example, a polyurethane layer, on the inner peripheral surface of the portion of the nozzle 10 that fits with the tip sleeve 16, a straight nozzle that is the tip sleeve 16 of the steam cleaner and a cleaning agent are sprayed. The nozzle 10 is in close contact.
The high-temperature steam sucked from the steam cleaner at a negative pressure is mixed with the cleaning agent supplied from the injection pipe 12 connected to the side surface orthogonal to the injection port 10A and the gap in the nozzle 10, and the high-temperature steam A cleaning agent is sprayed onto the object to be cleaned.

  In the embodiment shown in FIG. 2, the distal end surface of the distal end sleeve 16 is in contact with the inner peripheral extension portion of the injection tube 12, i.e., the same surface as the inner peripheral extension portion, but is not necessarily the same surface. The tip end surface of the steam cleaner 16 may be located on the steam cleaner side with respect to the inner peripheral surface of the injection pipe 12. By setting it as such an aspect, the negative pressure which attracts | sucks a washing | cleaning agent can be generated effectively in the nozzle 10, and the space mixed enough with high temperature steam can be ensured.

  FIG. 4 is a partially enlarged cross-sectional view showing an example of another aspect of the nozzle fitted to the tip sleeve 16 of the steam cleaner, and FIG. 5 is a partially enlarged perspective view. In the present embodiment, the nozzle 18 is elastically deformable so as to be fitted into a ring-shaped recess formed on the outer periphery of the straight nozzle that is the tip sleeve 16 of the steam cleaner, and to fix the nozzle 18 to the tip of the tip sleeve 16 of the steam cleaner. A nozzle fixing member 20 is provided. The nozzle fixing member 20 includes a notch 20A that fits into a ring-shaped recess near the tip of a straight nozzle that is the tip sleeve 16 of the steam cleaner, and a knob 20B that is used when the notch 20A is removed from the recess. According to this embodiment, the nozzle 18 can be stably fixed to the tip of the steam cleaner, and the nozzle 18 can be easily attached to and detached from the steam cleaner.

  A cleaning agent tank 13 </ b> A is connected to the tip of the injection pipe 12 that integrally protrudes from the outer periphery of the nozzle 18. A nut 32 that is rotatable to the neck 13B of the cleaning agent tank 13A is screwed with the tip of the injection pipe 12 to connect the cleaning agent tank 13A to the injection pipe 12 through a packing 34 in an airtight manner. The lead tube 36 is mounted in the cleaning agent tank 13A, the lower end is immersed in the cleaning agent, and the upper part is led into the nozzle 18 through the inside of the injection pipe 12 and reaches the vicinity of the tip of the tip sleeve 16. With such a structure, the cleaning agent tank 13A can be easily connected to the nozzle 18, and can be replaced with another tank after the cleaning agent is used. If the cleaning agent tank 13A is made of an elastically deformable resin, the lead tube 36 can be omitted because it is contracted by negative pressure.

  A steam cleaner is an apparatus that simply supplies high-temperature steam. In the cleaning method of the present invention, by using a household or industrial steam cleaner for supplying high-temperature steam and applying the cleaning agent according to the present invention, as shown in FIG. The cleaning method of the present invention can be easily performed without using a steam generator or the like provided with According to this embodiment, it is possible to more easily remove contaminants attached to an object to be cleaned by a soft blast method using a cleaning agent containing calcium carbonate powder and a specific thickener. It became.

  The steam supply pressure in the steamer 11 or the steam cleaner 16 is preferably 0.4 MPa to 1 MPa, and the temperature of the supplied steam is preferably 110 ° C. to 150 ° C. In this range, the optimum conditions for the steam injected together with the cleaning agent are that the supply pressure is 1 MPa and the temperature is 150 ° C.

  In the cleaning device 1, since the high-temperature steam supplied by the steamer 11 is injected from the injection port 10 </ b> A at a high speed, the inside of the nozzle 10 is decompressed. Accordingly, since the cleaning agent is sucked out from the cleaning agent tank 13 through the connection pipe 14 and the injection pipe 12, it is not always necessary to supply the cleaning agent by the pressurizing pump 15. However, when the injection speed of the vapor from the injection port 10A is not sufficient and the pressure is not sufficiently reduced to suck out the cleaning agent at the injection port 10A, or when the viscosity of the cleaning agent is large and the pressure reduction occurs at the injection port 10A. Then, in consideration of the case where the cleaning agent cannot be sucked out, it is preferable to insert the pressurizing pump 15 in the connection pipe line 14. As the pressurizing pump 15, a diaphragm pump is used in particular.

  The discharge pressure of the cleaning agent in the pressure pump 15 is preferably about 0.1 to 0.2 MPa. However, depending on the viscosity of the cleaning agent to be injected and the supply amount of the cleaning agent to the injection pipe 12, the discharge pressure in the pressure pump 15 may be smaller than 0.1 MPa or larger than 0.2 MPa. .

3. Cleaning method The cleaning method of the present invention comprises water, 0.05 to 1 part by weight of a thickener that imparts thixotropic properties to the cleaning agent, and 5 to 10 parts by weight with respect to 100 parts by weight of water. And spraying a cleaning agent containing calcium carbonate powder together with high-temperature steam toward the object to be cleaned.
When the cleaning agent is sprayed toward the object to be cleaned together with the high-temperature steam, the high-temperature cleaning agent adheres to the surface of the object to be cleaned together with the high-temperature steam. At this time, due to the high temperature of the cleaning agent, dirt attached to the object to be cleaned tends to float from the surface of the object to be cleaned, and as a result, it becomes easier to remove the dirt than when high temperature steam is not used. It is considered a thing.

The thixotropic property of the cleaning agent can be controlled by the content of the thickener. For this reason, when it is intended to apply the cleaning method of the present invention to a vapor jet cleaning method in which steam and a cleaning agent are sprayed onto the surface of an object to be cleaned, the viscosity increase in the cleaning agent used in the present invention is performed. The content of the agent is preferably 0.05 to 0.8 parts by weight with respect to 100 parts by weight of water.
Since the thickener imparts thixotropy to the cleaning agent, the dispersion of the cleaning agent is suppressed by containing 0.05 part by weight to 0.8 part by weight of the thickening agent with respect to 100 parts by weight of water. The cleaning agent adheres to the surface of the object to be cleaned or flows down on the surface of the object to be cleaned. When cleaning normal dirt, for example, dirt such as soil adhering to the outer wall surface of a house, by the cleaning method of the present invention, collect the cleaning agent containing dirt attached to the surface of the object to be cleaned, or The cleaning agent containing dirt can be collected below the object to be cleaned, or the cleaning agent can be discarded as it is.

On the other hand, when contaminants such as radioactive substances are attached to the surface of the cleaning object, the content of the thickener in the cleaning agent is 0.1 to 1 part by weight with respect to 100 parts by weight of water. It is preferable to use parts by weight. By using a cleaning agent containing 0.1 to 1 part by weight of a thickener with respect to 100 parts by weight of water, when the steam and the cleaning agent are sprayed onto the surface of the cleaning object, the viscosity of the cleaning agent is As a result, the cleaning agent adheres to the surface of the object to be cleaned and is more likely to stay.
Hereinafter, a method for recovering and treating the cleaning agent attached to the surface of the object to be cleaned in the present embodiment will be described.

4). Treatment method of recovered cleaning agent Since the cleaning agent of the present invention contains a thickener, it has thixotropic properties. In the cleaning method of the present invention, when the cleaning agent is attached to the surface of the object to be cleaned and the cleaning agent is to be collected, it can be obtained by adjusting the type and content of the thickener contained in the cleaning agent. When the cleaning agent to be cleaned is jetted together with steam toward the cleaning object, it can be kept on the surface of the cleaning object without scattering or flowing down. Therefore, the cleaning agent after cleaning adhering to the surface of the object to be cleaned can be easily recovered using a flooring vacuum cleaner or a squeegee.

The recovered cleaning agent can be treated by the following procedure.
First, the cleaning agent on the surface of the cleaning object is recovered, and the recovered cleaning agent is diluted with water. As a result, the thickener in the cleaning agent is diluted with water and loses its viscosity, the concentration of the thickening agent is lowered, and the calcium carbonate powder in the cleaning agent settles. The amount of water added when diluting the cleaning agent can be set to such an amount that the concentration of the thickening agent is lowered to such an extent that the calcium carbonate powder of the cleaning agent settles. The amount of water depends on the type and amount of thickener in the cleaning agent, but is usually about 2 to 3 times the weight of the recovered cleaning agent.

  The precipitated calcium carbonate powder is then recovered by filtration. Here, when the object to be cleaned is contaminated with a radioactive substance such as radioactive cesium, the radioactive cesium on the surface of the object to be cleaned is eluted into water in the cleaning agent and adsorbed on the calcium carbonate powder. Therefore, when the cleaning agent after the cleaning object is recovered and the calcium carbonate powder is precipitated, most of the radioactive substance in the cleaning agent is transferred to the calcium carbonate powder and does not remain in the supernatant water. Here, since calcium carbonate powder hardly dissolves in water, the supernatant water contains almost no radioactive cesium. Therefore, even when the object to be cleaned is decontaminated with a cleaning agent, it is considered that there is no particular environmental problem if the supernatant water is discarded as it is into a river or lake without being treated specially.

  On the other hand, since the precipitated calcium carbonate powder contains a radioactive substance in a high concentration, it is preferable to store and process it as radioactive waste as it is. The recovered calcium carbonate powder may be stored as it is after being appropriately dried, but it is dissolved in an acidic solution, and the radioactive substance in the obtained solution is adsorbed and removed by another adsorbent, The amount of radioactive waste can be further reduced. The adsorbent is generally used for the adsorption of radioactive cesium, and is preferably more excellent in cesium adsorption capacity than calcium carbonate powder. Specific examples of the adsorbent include adsorbent agents composed of highly ordered mesoporous materials synthesized from silica and alumina, Prussian blue, vermiculite, zeolite, and the like.

  According to the above-described embodiment, since an adsorbent that is more excellent in cesium adsorption capacity than calcium carbonate powder is used, compared with the case of diluting the recovered cleaning agent with water and precipitating the calcium carbonate powder, The amount can be further reduced. Therefore, it is considered that the radioactive liquid is hardly contained in the solution after adsorbing the radioactive substance, and can be discharged into rivers, lakes and the like after being appropriately neutralized.

(1) Example 1
When xanthan gum is used as a thickener and the amount of calcium carbonate powder is 5 parts by weight with respect to 100 parts by weight of water and 10 parts by weight, the compounding amount of xanthan gum and the dispersion stability of the calcium carbonate powder I investigated the relationship.
The amount of xanthan gum is 0.05 parts by weight, 0.1 parts by weight, 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight, 0.5 parts by weight, and 100 parts by weight of water. The amount was 0.6 parts by weight. In addition, the compounding quantity of the calcium carbonate powder in the following Table 1 and the xanthan gum was represented by the weight ratio with respect to 100 weight part of water, respectively.
The dispersion stability of the calcium carbonate powder was evaluated by visually inspecting the presence or absence of precipitation of the calcium carbonate powder after the cleaning agent was prepared and allowed to stand for 3 hours and 24 hours.
As xanthan gum, Echo Gum Celtrol F (trade name) manufactured by DSP Gokyo Food & Chemical Co., Ltd. was used, and NSK-100 (trade name) manufactured by Nichetsu Co., Ltd. was used as the calcium carbonate powder. NSK-100 is a mixture of calcium carbonate powder having a maximum particle size of 200 μm and a minimum particle size of 1 μm, and the median particle size is 100 μm. The results are shown in Table 1.
○: There is no precipitate in the cleaning solution and the dispersion stability of the calcium carbonate powder is good. Δ: The calcium carbonate powder is dispersed in the cleaning solution, but there is a precipitate that can be visually confirmed at the bottom of the container. The powder is almost precipitated.

  As shown in Table 1, all the cleaning agents after standing for 3 hours had good dispersion stability. On the other hand, after leaving the cleaning agent for 24 hours, when the amount of calcium carbonate powder is 5 parts by weight with respect to 100 parts by weight of water, the compounding amount of xanthan gum is 0.1 weight with respect to 100 parts by weight of water. When the amount was more than 1 part, no precipitation of calcium carbonate powder was observed. When the compounding amount of xanthan gum was 0.05 parts by weight with respect to 100 parts by weight of water, precipitation of calcium carbonate powder was observed.

  On the other hand, when the amount of calcium carbonate powder is 10 parts by weight with respect to 100 parts by weight of water, the detergent is prepared when the amount of xanthan gum is 0.4 parts by weight or more with respect to 100 parts by weight of water. After standing for 24 hours, no precipitation of calcium carbonate powder was observed. When the amount of xanthan gum is 0.3 parts by weight with respect to 100 parts by weight of water, the calcium carbonate powder is slightly precipitated, and when the amount of xanthan gum is 0.05 parts by weight to 0.2 parts by weight Sedimentation of calcium carbonate powder was clearly observed.

However, from the results of Table 1, the evaluation results based on the presence or absence of calcium carbonate powder settling when the detergent was allowed to stand for 24 hours after preparation had a difference in dispersion stability depending on the blending amount of calcium carbonate powder. After the cleaning agent was allowed to stand for 3 hours, no precipitation occurred in any of the cleaning agents. For this reason, even if it is a composition in which precipitation of calcium carbonate powder is observed after standing for 24 hours in Table 1, if the detergent is used within 3 hours, precipitation of calcium carbonate powder is a problem. It will not be.
Further, in the cleaning method of the present invention, when spraying the steam and the cleaning agent onto the surface of the cleaning object, the cleaning agent is pumped to the injection pipe by a pump, or the inside of the cleaning agent tank is stirred. The dispersibility of the calcium carbonate powder in the cleaning agent can be improved. For this reason, any cleaning agent in Example 1 can be suitably used for the cleaning method of the present invention.

(2) Example 2
Based on the results of Example 1, 5 parts by weight of calcium carbonate powder and 0.1 parts by weight of xanthan gum were blended with 100 parts by weight of water to prepare a cleaning agent. Then, this cleaning agent was sprayed toward the bathroom ceiling with steam by the cleaning device of the present invention. As a result, most of the cleaning agent adhered to the bathroom ceiling. The attached cleaning agent was removed by wiping with a rag.
The results are shown in FIG. As shown in FIG. 3, the bathroom ceiling had blackish dirt, but the area cleaned by the cleaning device of the present invention was wiped with the cleaning agent, so that the dirt that can be visually confirmed with the cleaning agent is It was confirmed that it was completely removed.

(3) Example 3
Based on the results of Example 1, a detergent was prepared by blending 5 parts by weight of calcium carbonate powder and 0.6 parts by weight of xanthan gum with 100 parts by weight of water.
This cleaning agent was then sprayed onto the surface of the vertical mortar wall with 110 ° C. steam by the cleaning device of the present invention. When the surface of the wall was observed after spraying, it was confirmed that most of the sprayed cleaning agent adhered to the surface of the wall, and that few scattered or flowed down the wall surface.
The cleaning agent adhering to the wall surface was collected using a squeegee made of silicone rubber. It was confirmed that the surface of the wall after the cleaning agent was collected with a squeegee was cleaned together with the cleaning agent, and there was no residual stain visually.
From the results of Examples 2 to 3, by removing the cleaning agent adhering to the cleaning object with a rag, squeegee, etc., the dirt is removed together with the cleaning agent. According to the cleaning method of the present invention, the cleaning object It can be seen that the dirt of the object was efficiently removed by a simple method.

DESCRIPTION OF SYMBOLS 1 Cleaning apparatus 10, 18 Nozzle 10A Injecting port 11 Steamer 12 Injecting pipe 13, 13A Cleaning agent tank 14 Connection pipe 15 Pressure pump 16 Steam cleaner tip sleeve 20 Nozzle fixing member

Claims (5)

  Water, 0.05 parts by weight to 1 part by weight with respect to 100 parts by weight of water, a thickener that imparts thixotropic properties to the cleaning agent, and 5 parts by weight to 10 parts by weight of carbonic acid with respect to 100 parts by weight of water A cleaning method in which a cleaning agent containing calcium powder is sprayed toward a cleaning object together with high-temperature steam.   The cleaning method according to claim 1, wherein the thickener is a thickener selected from the group consisting of xanthan gum, tragacanth powder, guar gum, spino gum, sodium carboxymethylcellulose, and carboxyvinyl polymer.   The cleaning method according to claim 1 or 2, wherein an average particle diameter of the calcium carbonate powder is 100 µm or less.   The cleaning object is a cleaning object whose surface is contaminated with a radioactive substance, and the cleaning agent is jetted together with high-temperature steam toward the surface of the cleaning object, so that the radioactive substance on the surface of the cleaning object The washing | cleaning method of any one of Claims 1-3 which removes.   The cleaning method according to claim 4, wherein the cleaning agent contains 0.1 to 1 part by weight of the thickening agent with respect to 100 parts by weight of water.