JP2022137345A - Cleaning nozzle and sanitary washing device including the same - Google Patents

Abstract

To provide a sanitary washing device in which a cleaning nozzle has been used and tested on site, the cleaning nozzle securing chemical resistance, preventing a coating film from being damaged even if brought into contact with an acidic or alkaline detergent, and capable of maintaining a good appearance having a cleanliness feeling.SOLUTION: A cleaning nozzle includes an ejection opening that ejects cleaning water and can move between a standby position and a use position. The cleaning nozzle includes a nozzle body and a cylindrical nozzle cover that covers an outer periphery of the nozzle body. A coating film is formed on a surface of the nozzle cover, the coating film including fluorine-containing acryl resin.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present disclosure relates to a cleaning nozzle and a sanitary cleaning device including the same.

Patent Literature 1 discloses a nozzle device from which dirt on a nozzle cover can be easily removed in cleaning the nozzle device of a sanitary washing device.

The nozzle device of this sanitary washing device includes a washing nozzle having a discharge hole for discharging washing water. The cleaning nozzle has a nozzle body and a cylindrical nozzle cover that covers the outer circumference of the nozzle body. The surface of the nozzle cover has a coating film composed of a low surface free energy layer having a surface free energy of 40 dyne/cm or less. This low surface free energy layer is made of fluororesin. Specifically, the low surface free energy layer is made of fluororesin such as PTFE, PFEP, PFA, and PCTFE.

Japanese Patent Application Laid-Open No. 2001-132055

Since the coating film of PTFE-based resin is insoluble in solvents and has a high melting point, baking coating is necessary. Therefore, when forming a coating film of a PTFE-based resin on a stainless steel base material, coloring is necessary in order to mask discoloration due to baking. For this reason, there is a problem that the clean appearance of stainless steel is spoiled.

In addition, since coloring requires the addition of pigments, there is also the problem that the chemical resistance is reduced, and the coating film is damaged when it comes into contact with toilet cleaning chemicals.

The present disclosure provides a cleaning nozzle and a sanitary cleaning device having the cleaning nozzle that can ensure chemical resistance and prevent coating film from being damaged even when an acidic or alkaline detergent comes into contact with the cleaning nozzle. In addition, the present disclosure provides a cleaning nozzle and a sanitary cleaning device including the cleaning nozzle that can keep the nozzle cover clean and beautiful.

A cleaning nozzle according to the present disclosure has an ejection opening for ejecting cleaning water and is movable between a standby position and a use position,
The cleaning nozzle has a nozzle body and a cylindrical nozzle cover that covers the outer periphery of the nozzle body,
A coating containing a fluorine-containing acrylic resin is formed on the surface of the nozzle cover.

In one aspect of the present disclosure, a coating film of acrylic polymer polymer containing fluorine (that is, acrylic resin containing fluorine atoms in the molecule, hereinafter referred to as "fluorine-containing acrylic resin") is applied to the surface of the nozzle cover at room temperature. Form. That is, an acrylate containing fluorine is polymerized to form a coating film of a fluorine-containing acrylic resin on the surface of the nozzle cover at room temperature. Unlike PTFE-based resins, it is not necessary to bake at high temperatures when forming coating films of fluorine-containing acrylic resins. Therefore, it is unnecessary to add a pigment for masking discoloration due to firing. Therefore, a transparent coating film can be formed on the surface of the nozzle cover. Since the coating film is transparent, when the surface of the nozzle cover has a metallic luster, such as when the surface of the nozzle cover is made of stainless steel, it is possible to maintain a clean and beautiful appearance of the nozzle cover. .

In addition, fluorine improves chemical resistance (for example, acid resistance and alkali resistance). Addition of a pigment lowers chemical resistance due to fluorine, but the present disclosure can suppress such a deterioration in chemical resistance. Therefore, chemical resistance can be ensured, and damage to the coating film can be prevented even when it comes into contact with an acidic or alkaline detergent.

A perspective view showing the appearance of the sanitary washing device installed on the toilet according to the first embodiment of the present disclosure. 2 is a perspective view showing the inside of the main body of the sanitary washing device according to Embodiment 1. FIG. FIG. 2 is a perspective view showing a stored state of the nozzle device according to Embodiment 1; A perspective view showing the buttocks washing state of the nozzle device according to the first embodiment. A vertical cross-sectional view showing the buttocks washing state of the nozzle device according to the first embodiment. Enlarged cross-sectional view of the nozzle cover of the cleaning nozzle of the nozzle device according to Embodiment 1 FIG. 11 is an enlarged cross-sectional view of a nozzle cover of a cleaning nozzle of a nozzle device according to Embodiment 2 of the present disclosure

(Knowledge, etc. on which this disclosure is based)
At the time when the inventors came up with the present disclosure, as described in the background art, PTFE-based resin was considered for antifouling of the nozzle cover. However, since PTFE-based resin is insoluble in solvents and has a high melting point, baking coating is required. The baking temperature is usually 200° C. or higher. For this reason, when the nozzle cover is coated with PTFE-based resin by baking, the base material of the nozzle cover is discolored by baking. Therefore, in order to mask the discoloration, a pigment is added to the PTFE-based paint to mask the discoloration of the base material of the nozzle cover. In recent years, stainless steel has been used as a material for nozzle covers. Since stainless steel has a clean appearance, there is a technical problem that it is desired that the coating film covering the stainless steel be transparent so as not to impair the design.

Also, when the user cleans the toilet, an acid or alkaline detergent for the toilet bowl is used. If the cleaning nozzle of the nozzle device is exposed during cleaning of the toilet bowl, such detergent may accidentally adhere to the cleaning nozzle. Since a pigment is added to the baking coating of PTFE-based resin, there is a part (that is, a pigment part) in the coating film structure where fluorine is not present. For this reason, there is also the problem that acid or alkali permeates the site and the coating film itself decomposes, and the coating film peels off from the nozzle cover.

In response to such problems, the present inventors have evaluated and studied paint materials. It has been found that it has transparency and can ensure chemical resistance.

The present disclosure provides a nozzle device capable of maintaining a clean and beautiful appearance of a nozzle cover, ensuring chemical resistance, and preventing damage to a coating film even when it comes in contact with an acidic or alkaline detergent.

Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters or redundant descriptions of substantially the same configurations may be omitted. This is to avoid the following description from becoming more redundant than necessary and to facilitate understanding by those skilled in the art.

It should be noted that the accompanying drawings and the following description are provided to allow those skilled in the art to fully understand the present disclosure and are not intended to limit the claimed subject matter thereby.

(Embodiment 1)
Embodiment 1 will be described below with reference to FIGS. 1 to 6 and Table 1. FIG.

[1-1. Constitution]
[1-1-1. Configuration of sanitary washing device 100]
As shown in FIG. 1, the sanitary washing device 100 of the present embodiment includes at least a main body 200, a sleeve portion 210, a toilet seat 300, a toilet lid 400, and the like. The sanitary washing device 100 of the present embodiment is installed on the upper surface 110a of the toilet bowl 110. As shown in FIG. The sleeve portion 210 is provided so as to protrude forward from the rear of the right side portion of the main body 200 . An operation portion 211, a plurality of operation switches 212, an indicator lamp 213, and the like are installed on the upper surface of the sleeve portion 210. As shown in FIG. The operation switch 212 operates each function of the sanitary washing device 100 .

Further, as shown in FIG. 2, inside the main body 200, a nozzle device 500, a deodorizing device 220, a control section 230, and the like are installed. The nozzle device 500 is installed in the central portion of the main body 200 . The deodorizing device 220 is arranged on the left side of the nozzle device 500 and sucks and deodorizes the odor inside the toilet bowl 110 . The control unit 230 controls each function of the sanitary washing device 100 based on the operation signal of the operation switch 212 .

FIG. 3 is a perspective view showing a stored state of the nozzle device according to the present embodiment. As shown in FIG. 3, the nozzle device 500 includes at least a support section 600, a cleaning nozzle 700, a driving section 800, a flow control valve 900, and the like. The cleaning nozzle 700 moves forward and backward along the support portion 600 . The drive unit 800 drives the cleaning nozzle 700 so as to move in forward and backward directions (that is, directions of two arrows pointing forward and backward in FIG. 3). The flow control valve 900 switches the supply of cleaning water to each channel of the cleaning nozzle 700 .

When the operation switch 212 of the operation unit 211 is operated to clean the buttocks, the nozzle main body 710 and the nozzle cover 720 are moved as shown in FIGS. According to a preset control sequence, it moves forward from the origin state (that is, the retracted position) until the number of revolutions of the drive motor 830 reaches a set value and then stops. That is, as shown in FIG. 5, the buttocks washing water jet port 711 faces the jetting opening 724 of the nozzle cover 720 (that is, the buttocks washing water jetting port 711 overlaps the jetting port 724). . This position is the "bottom washing position".

Next, with the nozzle main body 710 and the nozzle cover 720 arranged at the “back washing position”, the control unit 230 controls the water stop electromagnetic valve 243 and the flow control valve 900 to open the rear washing channel 714. Washing water is passed through to start washing the buttocks. The cleansing water spouted from the buttocks cleansing water spout 711 passes through the spouting opening 724 of the nozzle cover 720 without coming into contact with it and is spouted upward.

When the bottom washing is stopped, the control unit 230 controls the water stop solenoid valve 243 and the flow control valve 900 to stop the supply of washing water. Then, the control unit 230 reversely rotates the motor of the drive unit 800 to move the nozzle body 710 and the nozzle cover 720 rearward and return them to the original "storage position" shown in FIG.

[1-1-2. Configuration of Nozzle Cover of Nozzle Device]
In FIG. 6, a coating film 730 is formed on a nozzle cover 720 of the cleaning nozzle 700 to prevent the nozzle cover 720 from being soiled. In other words, the coating film 730 is formed on the outer surface of the nozzle cover 720 . Desirably, a coating film 730 is formed on the outer peripheral surface of the nozzle cover 720 . Desirably, a coating film 730 is formed on the tip of the nozzle cover 720 . As will be described later in detail, the coating film 730 contains a fluorine-containing acrylic resin. Desirably, the coating film 730 is formed from a fluorine-containing acrylic resin. More desirably, coating film 730 is made of fluorine-containing acrylic resin.

Also, the nozzle cover 720 is made of stainless steel. SUS304 is used in this embodiment. Preferably, the outer peripheral surface of the nozzle cover 720 is made of stainless steel. In other words, preferably, a coating film 730 containing a fluorine-containing acrylic resin is formed on the outer peripheral surface of the nozzle cover 720 made of stainless steel. More preferably, a coating film 730 made of fluorine-containing acrylic resin is formed on the outer peripheral surface of the nozzle cover 720 made of stainless steel. More preferably, a coating film 730 made of fluorine-containing acrylic resin is formed on the outer peripheral surface of the nozzle cover 720 made of stainless steel.

Similarly, the tip of nozzle cover 720 is preferably made of stainless steel. In other words, the coating film 730 containing the fluorine-containing acrylic resin is formed on the tip of the nozzle cover 720, which is preferably made of stainless steel. More desirably, a coating film 730 made of a fluorine-containing acrylic resin is formed on the tip of the nozzle cover 720 made of stainless steel. More preferably, a coating film 730 made of fluorine-containing acrylic resin is formed on the tip of the nozzle cover 720 made of stainless steel.

The fluorine-containing acrylic resin has the chemical formula —(CR ₁ R ₂ —CR ₃ COOR ₄ ) _n — (wherein R ₁ to R ₃ are each independently a hydrogen atom or a hydrocarbon group, and R ₄ is —C is an organic group represented by _m1 F _m2 H _m3 , n is a natural number of 2 or more, and m1 to m3 are each independently a natural number of 1 or more. coalescence). As will be described later, not only polymers composed of such polymers but also copolymers containing such polymers are included in the concept of the term "fluorine-containing acrylic resin". More preferably, _R1 and _{R2 are} hydrogen atoms and R3 is a hydrogen atom or a methyl group. More preferably, the formula: m2+m3=2m1+1 is satisfied.

As described above, in the present embodiment, the surface of the nozzle cover 720 is composed of a layer made of stainless steel (hereinafter referred to as a stainless steel layer) and a coating film 730 containing a fluorine-containing acrylic resin (preferably, a stainless steel layer). It is composed of a laminate structure of a coating film 730 made of a fluorine-containing acrylic resin, more preferably a coating film 730 made of a fluorine-containing acrylic resin. The coating film 730 is positioned on the outermost surface of the nozzle cover 720 .

The surface of the nozzle cover 720 may be roughened by polishing or blasting to improve adhesion with the coating film 730 .

[1-2. Method of Forming Coating on Nozzle Cover]
Next, a method for forming the coating film 730 on the nozzle cover 720 will be described. The paint of the coating film 730 contains fluorine-containing acrylate as the main raw material of the acrylic polymer resin. In addition to this main raw material (that is, fluorine-containing acrylate), the paint contains a fluorine-based solvent. Desirably, the fluorine-containing acrylate is a monomer represented by the chemical formula (CR ₁ R ₂ =CR ₃ COOR ₄ ). The monomer is polymerized and changed into a fluorine-containing acrylic resin.

The method of forming the coating film 730 on the nozzle cover 720 will be described in more detail below.

First, the surface of the nozzle cover 720 is cleaned and degreased with an organic solvent such as isopropyl alcohol, acetone, or hexane. After degreasing, it is dried by heating.

After the nozzle cover 720 is dried by heating, the paint for the coating film 730 is applied. Here, as an example of the coating method, there is a dipping method in which the nozzle cover 720 is immersed in a bath of paint and pulled up. Alternatively, as another example of the coating method, there is a spraying method of coating by spraying.

In the dipping method, the film thickness of the coating film 730 can be adjusted by the lifting speed at which it is lifted after dipping. As for the spray method, the film thickness of the coating film 730 can be adjusted by the amount of spray and the distance to the object. Here, the spraying method consumes more paint than the dipping method, but the adhesion of the coating film 730 to the nozzle cover 720 is high. In the spraying method, the solvent in the paint evaporates while the sprayed paint adheres to the nozzle cover 720, so the amount of solvent becomes smaller than in dipping when the paint adheres. As a result, shrinkage at the time of coating film formation is reduced, and internal stress is reduced, resulting in increased adhesiveness. The weight ratio of the solvent in the paint of the coating film 730 to the paint is 50% or more and 95% or less.

After the paint is applied to the nozzle cover 720, it is dried. Drying is carried out at room temperature for 1 to 2 days, so that the solvent component (ie, solvent) in the paint volatilizes and the fluorine-containing acrylate polymerizes. In this manner, the coating film 730 is formed as a fluorine-containing acrylic polymer polymer resin (that is, a fluorine-containing acrylic resin). Drying may be performed by heating at 50 to 120° C. for a short time of 10 minutes to 1 hour. However, when the film thickness of the coating film 730 is increased, the solvent in the coating film 730 may be volatilized and air bubbles may be generated by heat drying. Therefore, it is desirable to determine the drying conditions according to the film thickness of the coating film 730 to be formed.

Since the coating film 730 after drying is made of acrylic resin, it is colorless and transparent. In addition, since the drying temperature is a low temperature of 120° C. or less, the stainless steel of the base material (that is, the base material of the nozzle cover 720) is not discolored and the appearance is not spoiled.

[1-3. effect]
Next, the results of evaluating various characteristics of the nozzle cover 720 on which the coating film 730 is formed will be described. Table 1 shows the results of evaluating the characteristics of the nozzle cover.

In Table 1, the contact angle and the falling angle indicate the properties of water.

(Regarding simulated dirt adhesion rate)
Evaluation of adhesion of simulated dirt will be described below.

As a result of examining the dirt on the nozzle cover of the nozzle device of the toilet (that is, sanitary washing toilet seat), mold was confirmed in the dirt. Stool was thought to be the source of nutrients for this fungus. Therefore, a mixture of proteins, lipids, carbohydrates, and salt was diluted with water to prepare simulated stains. A nozzle cover 720 having a coating film 730 formed thereon was immersed in the simulated dirt using a dipping device and lifted out at a constant speed, and then the amount of dirt adhering was measured. For the nozzle cover 720 on which the coating film 730 was not formed, the adhesion amount was similarly measured. Then, the adhesion amount with the coating film 730 formed relative to the adhesion amount without the coating film 730 formed (that is, the weight of the deposit) was calculated as the simulated dirt adhesion rate.

(Regarding acid resistance and alkali resistance)
Next, evaluation of acid resistance and alkali resistance will be described. Acidic detergents containing hydrochloric acid as main components or alkaline detergents containing sodium hydroxide or hypochlorous acid as main components are used as detergents for toilet bowls.

When the user cleans the toilet, if the user uses this detergent to clean the toilet bowl and wash it with the nozzle cover 720 pulled out as shown in FIG. there's a possibility that.

Assuming such a situation, the acid resistance and alkali resistance test of the coating film 730 was carried out.

A method for testing the acid resistance and alkali resistance of the coating film 730 will be described. The cloth was impregnated with an aqueous solution obtained by diluting a commercially available acidic detergent (trade name “Sun Paul” (registered trademark)) and an alkaline detergent (trade name “Domest” (registered trademark)) by several tens of times. The cloth was composed of cotton. The impregnated cloth was wrapped around the nozzle cover 720, and the test sample was placed in a sealed container so as not to dry and left at room temperature for 10 days. After 10 days, the surface of the test sample was washed with water to observe the external appearance.

When there was no particular change in the appearance state, it was evaluated as "◯".

On the other hand, when there was peeling of the coating film or partial discoloration in the external appearance, it was evaluated as "x".

Table 1 also shows the test results of nozzle covers formed with coating films made of other materials as comparative examples in addition to the present example.

From Table 1, the silicon-based and silica glass-based coating films of Comparative Examples 1-6 and 1-7 are colorless and transparent, and the rate of adhesion of simulated dirt is small and favorable, but the coating film is damaged in the acid resistance test. and peeling were observed. Similar deterioration was also observed in the alkali resistance test. In particular, there is a problem that silica becomes sodium silicate and is easily eluted against an alkali.

On the other hand, there is a monomolecular film shown in Comparative Example 1-5 as a fluorine-based coating film. In Comparative Example 1-5, the coating film (i.e., monomolecular film) was colorless and transparent, and the adhesion rate of the simulated dirt was small and favorable, but the coating film (i.e., monomolecular film) was damaged and peeled in the acid resistance test Admitted. Similar deterioration was also observed in the alkali resistance test. The monomolecular film has a carbon chain formed by bonding carbon in a direction perpendicular to the substrate, and a fluorine atom having high resistance to acid and alkali is bonded to the end of the carbon chain. In Comparative Example 1-5, the monomolecular film contains fluorine atoms, but the molecules are not bonded to each other (i.e., do not form a polymer), and the coating film (i.e., monomolecular film) Since the film thickness of is also on the order of nanometers, there is a problem of low resistance to acids and alkalis.

PTFE (that is, polytetrafluoroethylene) of Comparative Example 1-2, FEP (that is, tetrafluoroethylene-hexafluoropropylene copolymer) of Comparative Example 1-3, PFA of Comparative Example 1-4 (that is, tetrafluoroethylene Ethylene-perfluoroalkyl vinyl ether copolymer) is a perfluoro-based fluoropolymer coating film. In these, since all the hydrogen atoms of the hydrocarbons forming the skeleton of the polymer were replaced with fluorine atoms, the test results of acid resistance and alkali resistance were good except for PTFE of Comparative Example 1-2. However, since these polymers are non-polar and difficult to dissolve in solvents, they must be baked at a high temperature of 250° C. in order to form a coating film on the nozzle cover 720 . Since the nozzle cover 720 is baked at such a high temperature, the stainless steel of the nozzle cover 720 is discolored. For this reason, it is necessary to mask the discoloration of the base material by adding a pigment to the paint for coloring. Depending on the type and amount of pigment to be added, the acid or alkali penetrates into the fluorine-free portion (that is, the pigment portion) and damages the coating film. This is considered to be the cause of deterioration of the coating film in the alkali resistance test of PTFE of Comparative Example 1-2.

When the fluoroethylene-vinyl ether polymer of Comparative Example 1-1 is used, a coating film can be formed by normal temperature curing, and the coating film is colorless and transparent. However, the contact angle was as small as 100° or less, and the falling angle was 80° or more. As a result, the simulated dirt adherence rate was as high as 99%, and there was a problem with the antifouling property.

Compared to the fluorine-based resins of Comparative Examples 1-1 to 1-5, the acrylic polymer polymer resin (that is, the fluorine-containing acrylic resin) of Example 1-1 using fluorine-containing acrylate as the main raw material has a viscosity of 150 Since the fluorine-containing acrylate was polymerized and cured at a low temperature of 0° C. or less, the base material of the nozzle cover 720, which was made of stainless steel, did not discolor and was colorless and transparent. Moreover, although the contact angle was 100° or more and had water repellency, the falling angle was as large as 64°. The simulated soil adhesion rate was small and favorable. The acid resistance and alkali resistance tests were also good with no change in the appearance of the coating film after the test. Since the paint used in Example 1-1 contained other monomers containing unsaturated bonds in addition to the fluorine-containing acrylate, the solvent was 70% (weight ratio) of the monomer component (that is, the Fluorine acrylate and other monomers) were contained at 30% (weight ratio) and the viscosity was high, so the coating film 730 could be formed relatively thick. Although the thickness of the coating film 730 depends on the coating method and conditions of the coating material, as an example, in Example 1-1, the coating film 730 has a thickness of 40 micrometers or more and 60 micrometers. Therefore, chemical resistance can be ensured by the coating film 730 containing fluorine and having a relatively large thickness.

As in Example 1-1, when the paint contains other monomers containing unsaturated bonds in addition to the fluorine-containing acrylate, the coating film 730 is a copolymer of the fluorine-containing acrylate and the other monomer. could be. In this specification, such copolymers are also included in the term "fluorine-containing acrylic resin".

In Example 1-2, the raw material of the acrylic polymer resin was composed only of fluorine-containing acrylate. Also in this case, since it polymerized and hardened at a low temperature of 150° C. or less, the stainless steel base material of the nozzle cover 720 did not discolor and was colorless and transparent. In addition, the contact angle was 100° or more, indicating water repellency, and the falling angle was as small as 46°, which was good. The simulated stain adhesion rate was as small as 11%, indicating good antifouling properties. The acid resistance and alkali resistance tests were also good with no change in the appearance of the coating film after the tests. Furthermore, in a salt water spray test separately conducted, there was no change in the appearance of the coating film after the test. From this, Example 1-2 was also effective in improving tolerance to salt contained in stool. Since the paint of Example 1-2 is composed only of fluorine-containing acrylate, the solvent is 90% (weight ratio) and the monomer component (that is, fluorine-containing acrylate) is 10% (weight ratio). Smaller than Example 1-1. Therefore, the coating film 730 is formed thinner than in Example 1-1. The thickness of the coating film 730 depends on the coating method and conditions of the coating material, but as an example, in Example 1-2, the coating film 730 has a thickness of 10 micrometers or more and 30 micrometers. However, in Example 1-2, since the raw material of the resin of the acrylic polymer polymer is composed only of fluorine-containing acrylate, fluorine atoms are more densely present in the polymerized polymer than in Example 1-1. As a result, chemical resistance can be secured even with a thin film, and salt water resistance can be improved.

In Example 1-1, since the viscosity of the paint is high, the dipping method is suitable as the coating method. As for Example 1-2, since the viscosity of the paint is low, the dipping method or spraying is possible. As described above, the spraying can improve the adhesion of the base material of the nozzle cover 720 to the stainless steel.

The film thickness of the coating film 730 is adjusted by the lifting speed in the case of the dipping method, and by the amount and distance of the spray in the case of spraying. In order to ensure chemical resistance, the test results show that the film thickness must be 10 μm or more, and preferably 15 μm or more. However, if it is too thick, the coating film cracks, so the thickness must be 50 μm or less, preferably 30 μm or less.

Further, the coating film 730 may contain an antibacterial agent to impart an antibacterial action. After adding 1.0% (weight ratio) of a silver-based antibacterial agent to the fluorine-containing acrylate to the paint of this example, a coating film was formed on a stainless steel substrate, and this test sample was subjected to an antibacterial test based on JISZ2801. As a result, an antibacterial effect with an antibacterial activity value of 2.0 was observed against Escherichia coli and Staphylococcus aureus. As for the amount of the antibacterial agent to be added, in order to obtain an antibacterial effect, the weight ratio of the antibacterial agent to the resin (that is, the fluorine-containing acrylic resin contained in the coating film 730) must be 1.0% or more. In order to maintain antifouling properties and chemical resistance, the weight ratio is desirably 1.0% or more and 5.0% or less. As described above, the weight ratio is a value obtained by dividing the weight of the antibacterial agent by the fluorine-containing acrylic resin contained in the coating film 730 . In this embodiment, the antibacterial agent used is a silver-based antibacterial agent, but other antibacterial agents such as zinc and copper-based antibacterial agents may be used. However, silver-based antibacterial agents have an antibacterial effect in a small amount compared to these antibacterial agents, so it is desirable to use a silver-based antibacterial agent in order to achieve both antifouling properties and chemical resistance.

[1-4. summary]
As described above, in the present embodiment, the cleaning nozzle 700 includes the buttocks cleaning water spout 711 , the nozzle main body 710 , and the tubular nozzle cover 720 covering the outer periphery of the nozzle main body 710 . A coating film 730 is formed on the surface of the nozzle cover 720 and contains a fluorine-containing acrylic resin polymerized using a fluorine-containing acrylate as a main raw material.

As a result, the coating film 730 can be formed at normal temperature, so that the nozzle cover 720 can be kept transparent and beautiful. The coating film 730 is a resin coating film obtained by three-dimensionally polymerizing a fluorine-containing polymer, and the coating can contain a large amount of fluorine-containing acrylate. As a result, a thick coating film 730 can be formed, ensuring chemical resistance. As a result, damage to the coating film 730 can be prevented even when it comes into contact with acidic or alkaline detergents.

As in Example 1-2, a coating film 730 made of an acrylic resin polymerized using only fluorine-containing acrylate as a raw material may be formed on the surface of the nozzle cover 720 . In this case, the coating film 730 is a thin film because the amount of fluorine-containing acrylate that can be contained in the paint is small. As a result, chemical resistance can be secured even with a thin film, and salt water resistance can be improved. Also, since the viscosity of the paint is low, it can be applied by various methods such as dipping or spraying.

The film thickness of the coating film 730 may be 10 μm or more and 50 μm or less. By forming the film to a thickness of 10 μm or more, it is possible to prevent the permeation of an acid or alkali chemical from reaching the interface between the nozzle cover 720 and the coating film 730 , thereby preventing the coating film 730 from peeling off and the nozzle cover 720 to to prevent corrosion of the base material. Cracking of the coating film 730 is prevented by setting the film thickness to 50 μm or less.

Coating 730 may contain an antimicrobial agent. Due to the antibacterial properties of the antibacterial agent, it is possible to suppress the growth of mold on the surface of the nozzle cover 720 and further improve the antifouling property.

The antibacterial agent may be a silver-based antibacterial agent. As a result, since a small amount of the antibacterial agent has an antibacterial effect, it is possible to reduce the decrease in the transparency of the coating film due to the addition of the antibacterial agent, and to achieve both antifouling properties and chemical resistance and effects.

The antibacterial agent may be contained in a weight ratio of 1.0% or more and 5.0% or less with respect to the fluorine-containing acrylic resin. That is, it is desirable that the weight ratio of the antibacterial agent to the resin (that is, the fluorine-containing acrylic resin contained in the coating film 730) is 1.0% or more and 5.0% or less. As a result, it is possible to further reduce the decrease in the transparency of the coating film due to the addition of the antibacterial agent, and achieve both antifouling properties and chemical resistance effects.

(Embodiment 2)
Embodiment 2 will be described below with reference to FIG.

The configurations of the sanitary washing device 100, the nozzle device 500, and the washing nozzle 700 are the same as those of the first embodiment, and detailed description thereof will be omitted.

[2-1. Configuration of nozzle cover 720 of nozzle device]
In FIG. 7, a primer layer 731 is formed on the surface of nozzle cover 720 of cleaning nozzle 700 . A coating film 730 is formed on the primer layer 731 . Table 2 shows the results of confirming the adhesiveness of various materials to the stainless base material for the material of the primer layer 731 .

The primer layer 731 is made of polymer containing no fluorine atoms. Since the primer layer 731 is formed of a polymer containing no fluorine atoms, it is possible to improve the adhesion between the coating film 730 containing the fluorine-containing acrylic resin and the nozzle cover 720 .

Table 2 shows a sample in which the coating film 730 was formed after forming the primer layer 731, and a sample in which the coating film 730 was formed after pretreatment (that is, solvent degreasing treatment with isopropyl alcohol) on the stainless steel substrate without forming the primer layer 731. 2 shows adhesion test results for formed samples.

(Adhesion test)
For each treatment specification, an adhesion test was performed on a sample dried at room temperature (“Heat treatment: None” in Table 2) and a sample heated at 100° C. (“Heat treatment: Yes” in Table 2). In the primary tape peeling test, peeling of the coating film 730 was confirmed by adhering Sellotape (registered trademark) to the coating film 730 after drying and then peeling off the Sellotape (registered trademark). Next, the state of the coating film 730 after being immersed in boiling water at 98° C. was observed. Furthermore, a tape peeling test was performed again (hereinafter, the tape peeling test is referred to as a “secondary tape peeling test”) to confirm peeling of the coating film 730 .

From Table 2, it can be seen that among the various primer materials, the olefin-based materials had better release and It was found that there is no heat effect and the adhesion between the stainless steel material and the coating film 730 is excellent.

The primer layer 731 is formed on the surface of the nozzle cover 720 by dipping or spraying and drying. Then, a coating film 730 is formed on this primer layer 731 . As for the method of forming the coating film 730, the same method as in the first embodiment can be applied.

[2-2. effect]
As a result of evaluating the antifouling property of the nozzle cover 720 having the coating film 730 formed on the primer layer 731 in the same manner as in the first embodiment, the adhesion rate of the simulated fouling was low and favorable. Moreover, as a result of carrying out an acid resistance and alkali resistance test, no change in the appearance of the coating film 730 was observed, and it was good.

Further, assuming that the user cleans the nozzle cover 720, a wear test was conducted in which a cloth dipped in a weakly alkaline detergent was applied to the nozzle cover 720 with a constant load while rubbing the coating film 730 back and forth. As a result of this wear test, no peeling of the coating film 730 forming the primer layer 731 from the nozzle cover 720 was observed. Thus, the primer layer 731 improved adhesion. Since the polyolefin structure of the primer layer 731 does not contain fluorine atoms, the primer layer 731 can improve adhesion between the nozzle cover 720 and the coating film 730 .

[2-3. summary]
As described above, in Embodiment 2, primer layer 731 is formed on the surface of nozzle cover 720 of cleaning nozzle 700 , and coating film 730 is formed on primer layer 731 . Since the primer layer 731 is made of fluorine-free resin, the adhesion to the nozzle cover 720 can be improved.

Desirably, the primer layer 731 is a polyolefin resin. The adhesion between the stainless base material of the nozzle cover 720 and the coating film 730 can be further improved by the polyolefin resin.

Note that the above-described embodiment is for illustrating the technology in the present disclosure, and various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or equivalents thereof.

The present disclosure can ensure chemical resistance and prevent damage to the coating even when exposed to acidic or alkaline detergents. In addition, since it is colorless and transparent, the clean appearance of the washing nozzle can be maintained, so that it can be applied to a sanitary washing device for toilet.

REFERENCE SIGNS LIST 100 sanitary washing device 110 toilet bowl 200 main body 210 sleeve portion 211 operation portion 212 operation switch 213 indicator light 220 deodorizing device 230 control portion 243 water stop solenoid valve 300 toilet seat 500 nozzle device 600 support portion 700 washing nozzle 710 nozzle main body 711 bottom washing water Ejection port 714 Bottom washing channel 724 Ejection opening 720 Nozzle cover 730 Coating film 731 Primer layer 800 Actuator 900 Flow control valve

Claims (15)

A cleaning nozzle having an ejection opening for ejecting cleaning water and movable between a standby position and a use position,
The cleaning nozzle has a nozzle body and a cylindrical nozzle cover that covers the outer periphery of the nozzle body,
A coating film containing a fluorine-containing acrylic resin is formed on the surface of the nozzle cover,
cleaning nozzle. The coating film is made of a fluorine-containing acrylic resin,
The cleaning nozzle according to claim 1. The film thickness of the coating film is 10 μm or more and 50 μm or less.
The cleaning nozzle according to claim 1 or 2. The coating film contains an antibacterial agent,
The cleaning nozzle according to any one of claims 1-3. The antibacterial agent is a silver-based antibacterial agent,
The cleaning nozzle according to claim 4. The weight ratio of the antibacterial agent to the fluorine-containing acrylic resin is 1.0% or more and 5.0% or less.
The cleaning nozzle according to claim 4 or 5. A primer layer is formed between the surface of the nozzle cover and the coating film.
The cleaning nozzle according to any one of claims 1-6. The cleaning nozzle according to claim 7, wherein the primer layer is made of polyolefin resin. The fluorine-containing acrylic resin is composed of a polymer represented by the chemical formula —(CR ₁ R ₂ —CR ₃ COOR ₄ ) _n —.
The cleaning nozzle according to any one of claims 1-8.
here,
R ₁ to R ₃ are each independently a hydrogen atom or a hydrocarbon group,
R ₄ is an organic group represented by -C _m1 F _m2 H _m3 ,
n is a natural number of 2 or more, and m1 to m3 are each independently a natural number of 1 or more. The fluorine-containing acrylic resin comprises a copolymer containing a polymer represented by the chemical formula —(CR ₁ R ₂ —CR ₃ COOR ₄ ) _n —.
The cleaning nozzle according to any one of claims 1-8.
here,
R ₁ to R ₃ are each independently a hydrogen atom or a hydrocarbon group,
R ₄ is an organic group represented by -C _m1 F _m2 H _m3 ,
n is a natural number of 2 or more, and m1 to m3 are each independently a natural number of 1 or more. R ₁ and R ₂ are hydrogen atoms and R ₃ is a hydrogen atom or a methyl group,
11. The cleaning nozzle according to any one of claims 9 or 10. 12. The cleaning nozzle of claim 11, wherein the formula: m2+m3=2m1+1 is satisfied. the surface of the nozzle cover has a metallic luster;
The cleaning nozzle according to any one of claims 1-12. a surface of the nozzle cover is made of stainless steel;
The cleaning nozzle according to any one of claims 1-12. A sanitary washing device comprising the washing nozzle according to any one of claims 1-14.

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