JP2009127384A - Drain outlet of kitchen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drain outlet of a kitchen which can effectively prevent a contaminant like slime from attaching. <P>SOLUTION: The surface of a drain outlet member 1 is coated with an acrylic resin composition containing 1-70 mass% of a dimethylsilicone group represented by formula (1). The surface of the drain outlet is formed to have an excellent droplet slidable property by having a coating film 2 of the acrylic resin composition, so that water or oil droplets placed on the surface can be rolled and removed from the surface in a short time. Consequently, the water or oil is prevented from staying on the surface of the drain outlet, bacteria is restrained from breeding, and the slime is effectively restrained from developing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drain outlet such as a sink of a kitchen.

  A drain outlet provided in a kitchen sink or the like is a portion through which a large amount of food materials or oil flows, and organic dirt is very easily adhered to the surface, often resulting in a slimy surface or a bad odor.

  The mechanism by which dirt adheres to the drainage outlet and is generated is as follows. First, oil contained in domestic wastewater such as dishwashing water adheres to the drainage outlet and accumulates, and then various germs propagate using this oil as nutrients. And this microbe forms the protective layer which has an acid as a main component for the purpose of strengthening the power which adheres to the surface of a drain outlet, and protection of itself, and this protective layer becomes slimy. . This bad smell and bad smell generated from the slime give a dirty image to the drain.

  In order to remove the slime of such drain outlets, conventionally, the drain outlet is rubbed with a sponge or scrubber containing detergent, or an alkaline detergent containing sodium hypochlorite (for example, “Kitchen” manufactured by Kao Corporation ”) Is used to disassemble the slime, but the drainage outlet has a filthy image as mentioned above and is a part that you do not want to touch so much. It is hoped that.

  As one of the methods to suppress the occurrence of slime at the drain outlet, the base material forming the drain outlet contains an antibacterial agent such as silver, or a coating film containing the antibacterial agent is formed on the surface of the drain outlet. It is conceivable to suppress the propagation of germs at the drain outlet. However, there is a problem that the antibacterial agent gradually elutes at the drain outlet where water always flows, and it is difficult to maintain the bactericidal effect for a long time, and the accumulation of oil etc. in the drain port reduces the bactericidal effect of the antibacterial agent. Therefore, there is a problem that it is impossible to prevent the propagation of bacteria, and it is difficult to practically suppress slime.

  Therefore, it has been studied to suppress the occurrence of slime by forming an antifouling coating film on the surface of the drain port to prevent the contaminants from adhering to the drain port.

  For example, in Patent Document 1, an antifouling property is imparted by forming a coating film of a coating composition containing a specific siloxane polymer, a specific hydroxyl group-containing acrylic resin, and a polyisocyanate crosslinking agent. However, this can be easily removed by wiping even if contaminants adhere, but it is not intended to prevent the contaminants from adhering to them, and it is expected to have an effect of suppressing the occurrence of slime. Can not.

  In Patent Document 2, antifouling properties are obtained by forming a hydrophilic film made of an inorganic oxide film or a water-repellent film made of a silicone film. However, with this material, the surface is made hydrophilic or water-repellent, and water and oil attached to the surface are difficult to roll, and water and oil cannot be naturally removed from the surface in a short time. For this reason, there is a risk that moisture and oil will always remain on the surface and bacteria may propagate, and it is not possible to expect the effect of suppressing the occurrence of slime.

Furthermore, in Patent Document 3, antifouling properties are obtained by forming a water-repellent coating or a water slidable coating with a silicone-containing coating or the like. In this case, by making the surface slippery, water droplets and oil droplets attached to the surface are easy to roll, and it is possible to naturally remove moisture and oil from the surface. The silicone-containing film having the composition as described above does not have sufficient lubricity and cannot be expected to have a high effect of suppressing the occurrence of slime.
JP 2002-293969 A JP 2001-173056 A JP 2001-275866 A

  As described above, by forming an antifouling coating film as described in Patent Documents 1 to 3, it is not possible to sufficiently prevent contaminants such as slime from adhering to the drain outlet.

  This invention is made | formed in view of said point, and it aims at providing the drain outlet of the kitchen which can suppress effectively that contaminants, such as a slime, adhere.

  The drain port of the kitchen according to the present invention is formed by coating the surface of the drain port member with an acrylic resin composition having a dimethylsilicon group represented by the formula (1) at a content of 1 to 70% by mass. It is characterized by.

  According to the present invention, the surface of the drain outlet can be formed with high water slidability by the coating film of the acrylic resin composition described above, and the water and oil adhering to the surface are rolled in a short time from the surface. It can be removed, and moisture and oil can be prevented from remaining on the surface of the drainage port to suppress the growth of various germs and to effectively prevent the occurrence of slime.

  In the present invention, the acrylic resin has a fluorine-containing group selected from at least one of the following formulas (2) to (5).

  According to the present invention, the fluorine-containing group contained in the acrylic resin can impart water repellency in addition to lubricity, and can make water and oil into water droplets and oil droplets and can be easily rolled. A high effect of removing water and oil from the surface can be obtained.

  Further, the present invention is characterized in that the above acrylic resin composition contains dimethyl silicone oil.

  According to this invention, lubricity can be improved by containing dimethyl silicone oil.

  In the present invention, the coating film of the acrylic resin composition is characterized in that the difference between the advancing contact angle and the receding contact angle of water is in the range of 0 to 20 °.

  According to this invention, even when the falling angle of the surface of the drainage port is small, high water slidability can be obtained.

  The present invention is characterized in that the acrylic resin composition contains an isocyanate resin as a crosslinking agent for the acrylic resin.

  According to this invention, an acrylic resin can be cured at a low temperature, and a coating film excellent in chemical resistance and water resistance can be formed.

  Further, the present invention is characterized in that the acrylic resin composition contains an amino resin as a crosslinking agent for the acrylic resin.

  According to this invention, an acrylic resin can be cured at a low temperature, and a coating film excellent in chemical resistance and water resistance can be formed.

  According to the present invention, the surface of the drain outlet can be formed with high lubricity by the coating film of the acrylic resin composition, and water and oil adhering to the surface are rolled and removed from the surface in a short time. Therefore, it is possible to prevent moisture and oil from remaining on the surface of the drainage port, to suppress the propagation of germs, and to effectively prevent the occurrence of slime.

  Hereinafter, the best mode for carrying out the present invention will be described.

  The acrylic resin used in the acrylic resin composition of the present invention has a molecular structure in which the dimethylsilicon group represented by the above formula (1) is bonded as a side chain to the molecular skeleton of the resin. This dimethylsilicon group functions as a water repellent group. As the water repellent group, a fluorine-containing group such as perfluoroolefin, an aliphatic hydrocarbon group, or the like can be used. Is particularly preferred. The contact angle of water to the acrylic resin coating film having a dimethylsilicon group is about 100 °, which is lower than that having a fluorine-containing group, but the acrylic resin coating film having a dimethylsilicon group has a high water slip surface. Can be formed.

  When the length of the dimethylsilicon group is longer, a coating film having good lubricity can be formed, but when it is too long, the coating film tends to be soft. On the contrary, when the length of the dimethylsilicon group is short, the hardness of the coating film is increased, but the sliding property is deteriorated. For this reason, the length of the dimethylsilicon group is preferably n = 1 to 400 in the formula (1). Moreover, when the content rate of the dimethyl silicon group in an acrylic resin is high, although a coating film with favorable sliding property can be formed, there exists a tendency for a coating film to become soft. On the other hand, when the content of the dimethylsilicon group is low, the hardness of the coating film is increased, but the sliding property is deteriorated. For this reason, the content rate of the dimethyl silicon group in an acrylic resin (a side chain is included) needs to be 1-70 mass%.

  The acrylic resin can be prepared by polymerizing various acrylic monomers, and the acrylic monomer can be represented by the following general formula (6).

_{CH 2 = CR 1 -COOR 2 (} 6)
The acrylic monomer of formula (6) is a (meth) acrylic acid ester in which R ₁ is a hydrogen atom and / or a methyl group, and R ₂ is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 9 carbon atoms. .

R ₂ essentially requires a dimethylsilicon group, and examples of the group to be used together include, for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, ter- Alkyl groups such as butyl, pentyl, hexyl, heptyl and octyl; cycloalkyl such as cyclopentyl and cyclohexyl; aralkyl such as 2-phenylethyl, 2-phenylpropyl and 3-phenylpropyl Group; aryl group such as phenyl group and tolyl group; halogenated hydrocarbon group such as chloromethyl group, γ-chloropropyl group and 3,3,3-trifluoropropyl group; hydroxy hydrocarbon such as 2-hydroxyethyl group Group etc. can be mentioned and 1 or more types can be selected from these.

  As the acrylic resin, those having a weight average molecular weight (Mw) of 20,000 to 500,000 are preferably used. More preferably, it is 50000-300000, More preferably, it is 150,000-250,000. If the molecular weight of the acrylic resin is too high, the compatibility with the solvent or the crosslinking agent tends to be poor, and if the molecular weight of the acrylic resin is too low, the physical properties of the resulting coating film tend to be lowered. The hydroxyl value of the acrylic resin is preferably in the range of 40 to 200 mgKOH / g, more preferably in the range of 60 to 150 mgKOH / g. When the hydroxyl value is too low, the crosslinking density of the resulting coating film is lowered, and the coating film tends to have a low hardness. On the other hand, if the hydroxyl value is too high, a hard coating film can be obtained, but the compatibility between the acrylic resin and the solvent tends to decrease, and the resin stability tends to be poor.

  As a crosslinking agent for curing the acrylic resin of the acrylic resin composition, it is preferable to use an isocyanate resin or an amino resin. By using an isocyanate resin or an amino resin as a cross-linking agent, it can be cured at a low temperature, and a coating film excellent in chemical resistance and water resistance can be formed.

  As the isocyanate resin, it is possible to use a prepolymerized basic monomer such as hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane-4,4-diisocyanate, bis (4-isocyanatocyclohexyl) methane, isophorone diisocyanate, lysine triisocyanate. In addition, as the crosslinked structure, those having a structure such as an isocyanurate body, an adduct body, and a biuret body can be used. The content ratio of the isocyanate resin to the acrylic resin is preferably set so that the equivalent ratio of the NCO group of the isocyanate resin to the hydroxyl value of the acrylic resin is in the range of 0.5 to 1.5. When the equivalent ratio is lower than this range, the reactivity becomes poor, the hardness of the coating film becomes low, and scratches and dirt are likely to adhere. On the other hand, when the equivalence ratio is higher than this range, scales or the like are bonded to the free isocyanate group, so that dirt is likely to adhere or the sliding property may be lowered.

  Examples of amino resins include urea resins, melamine resins, and benzoguanamine resins. Among them, melamine resins are preferably used. Melamine resins are broadly classified into butylated melamine resins and methylated melamine resins, and are further classified into complete alkyl type, imino type, methylol type, and methylol imino type depending on the structure of the skeleton. . The addition amount of the amino resin is preferably in the range of 10 to 50% by mass and more preferably in the range of 15 to 40% by mass with respect to the solid content of the acrylic resin (including the dimethylsilicon group side chain). When the addition amount of the amino resin is increased, a dense coating film can be formed. However, when the amount exceeds this range, the coating film is hard and brittle, and the adhesion tends to deteriorate. On the other hand, when the amount is less than this range, the reactivity of the melamine resin composition becomes poor and there is a possibility that the intended coating film cannot be formed.

  An acrylic resin composition can be prepared by blending an acrylic resin having a dimethylsilicon group, a crosslinking agent such as an isocyanate resin or an amino resin, a solvent, and further components described later. An antifungal agent or the like can also be blended.

  The antibacterial agent is not particularly limited, but antibacterial metals such as silver, copper, and zinc and their compounds, and their supported products (supports are silica, zeolite, apatite, calcium phosphate, zirconium phosphate, phosphorus And quaternary ammonium salts, nitrile derivatives, imidazole derivatives, benzothiazole derivatives, inchiazole derivatives, triazine derivatives, sulfone derivatives, phenol derivatives, and the like can be preferably used.

  The antifungal agent is not particularly limited, but tepconazole, 2-pyridinethiol-1-oxide zinc, 2,4,4′-trichloro-2′-hydroxydiphenyl ether, 10-10′oxybisphenoxy Arsine, copper, silver, zinc, a copper compound, a silver compound, a zinc compound, a copper support, a silver support, a zinc support and the like can be suitably used.

  And, by applying the above acrylic resin composition to the surface of the member constituting the drain port such as the sink of the kitchen and curing it, an acrylic resin coating film is formed on the surface of the drain port member, and the water slidability is high A drainage port having a surface can be formed. Thus, when coating the acrylic resin composition on the surface of the drain port member, in order to increase the adhesion of the coating film, the drain port member is surface-treated or a primer is applied to the drain port member. Also good. The surface treatment can be performed on the drain port member formed of stainless steel by chemical treatment such as chromate treatment or zinc phosphate treatment. As the primer, epoxy resin paint, acrylic resin paint, alkyd resin paint, urethane resin paint, inorganic paint, etc. can be used. As the inorganic paint, silicon derivatives such as tetraethoxysilane and hydrolysis condensates thereof are used. In general, titanium derivatives such as titanium alkoxide, zirconia derivatives such as zirconia alkoxide and hydrolysis condensates thereof are used, and water glass such as lithium silicate and potassium silicate can also be used.

  Here, when the surface is made water-repellent as described in Patent Documents 1 and 2 described above, water drops are formed by repelling water W as shown in FIG. However, there is a risk that contaminating components contained in the water will accumulate on the surface. If the surface is made hydrophilic as described in Patent Documents 1 and 2, the water W on the surface wets and spreads and does not roll as shown in FIG. 1C, so that the water W is completely dried. It takes a considerable amount of time and the water W is spread and spreads, so that contaminating components contained in the water are likely to accumulate. In this way, when making the surface water-repellent or hydrophilic, the drying of water is slow, contaminating components contained in the water accumulate and adhere to it, and various germs are propagated by this contaminating component, thus suppressing the occurrence of slime. It is not possible.

  On the other hand, when the coating film 2 made of the acrylic resin composition is formed on the surface of the drain port member 1 as in the present invention, and the drain port is formed on the surface having high lubricity, as shown in FIG. The water W on the surface of the drain port member 1 rolls and moves even at a gentle inclination, so that water can be removed from the surface of the drain port, so that almost no water remains on the surface of the drain port. In particular, the surface of the drain outlet is formed on a vertical surface or an inclined surface having a gradient for flowing water, and the water on the surface of the coating film 2 having high water slidability is along the vertical surface or the inclined surface. It rolls easily and is discharged in a short time. Accordingly, water can be removed from the surface of the drain port in a relatively short time so that no water remains on the surface, and the surface of the drain port can be dried in a short time. . This also applies to the oil component, and the oil component on the surface of the drain port member 1 rolls and flows so that almost no oil component remains on the surface of the drain port. For this reason, it is possible to prevent the contamination components contained in water from accumulating on the surface of the drain outlet, and since no oil remains as bait for germs, it is possible to suppress the propagation of germs. It is possible to suppress the generation of slime produced by the above, and to effectively prevent the slime from adhering to the drain outlet.

  The above-described high surface water-sliding property is that the dimethylsilicon group bonded to the acrylic resin skeleton moves to the outermost surface when the coating film 2 is formed on the surface of the drain port member 1, and the dimethylsilicon group is inclined on the surface. It is obtained by orienting. Since this dimethylsilicon group is chemically bonded to the acrylic resin skeleton, it does not drop off easily even if it is repeatedly subjected to wear or hot water, and can maintain a high water slidability forever. .

  FIG. 2A shows an example of the drain port A of the sink 3, in which the drainage basin 4 is recessed on the bottom surface of the sink 3, and the drainage cylinder 5 is provided on the bottom surface of the drainage basin 4. The drain tube 5 is connected to a drain pipe, and the upper portion of the drain tube 5 is projected from the bottom surface of the drain tube 4 into the drain tube 4. A portion of the drain tube 5 protruding into the drain rod 4 is covered with a trap rod 6 having an open bottom surface, and a notch 8 through which water flows is formed at the lower end edge of the trap rod 6. A mesh basket is attached to the opening on the upper surface of the drainage basin 4. In this drainage port A, the drainage port A is formed with the drainage basin 4, the drainage tube 5 and the trap cage 6 as the drainage port member 1, and the upper end of the drainage tube 5 is formed in the drainage basin 4 of the drainage port A. Water always stays below the water line L. 2A, the water-slidable coating film 2 of the present invention is formed on the surface of the drainage basin 4 and the surface of the trap basin 6 above the water line L not immersed in water. Thus, it is preferable to prevent the occurrence of slime. Even if the water-slidable coating film 2 is formed below the water line L, the above-mentioned effect cannot be expected because this part is always immersed in water, and there is no slime in this part. Even if it occurs, there is no problem of malodor due to being in water, so it is not necessary to form the water-slidable coating film 2 of the present invention.

  FIG. 2 (b) shows another example of the drain port A of the sink 3, in which the drainage basin 4 is recessed on the bottom surface of the sink 3, and the drainage pipe 7 is connected to the bottom surface of the drainage basin 4. It is. The drain pipe 7 is connected to the drain pipe through a trap, and a net basket is attached to the opening on the upper surface of the drainage tub 4. In this drainage port A, the drainage port A and the drainage pipe 7 are used as the drainage port member 1 to form the drainage port A, and the drainage port A of the type shown in FIG. Therefore, it is preferable to prevent the occurrence of slime by forming the water-slidable coating film 2 of the present invention on the entire surface from the inner peripheral surface to the bottom surface of the drainage tub 4.

  Here, in order for the surface of the coating film 2 to exhibit high water slidability as described above, it is preferable that the difference between the forward and backward contact angles of water with respect to the surface of the coating film 2 is in the range of 0 to 20 °. In general, when a water droplet is dropped on an inclined slope, as shown in FIG. 3, the water droplet W has a curved surface and slides down, and the contact angle of the front water droplet in the traveling direction is the forward angle (forward contact angle) θa, and the rear The contact angle of the water droplet on the side becomes the receding angle (receding contact angle) θr. The smaller the falling angle α, which is the inclination angle at which the water droplet starts to fall, the better the sliding property. Thus, in order to reduce the falling angle α, it is preferable that the difference between the advancing contact angle θa and the receding contact angle θr is in the range of 0 to 20 °. Usually, since the water droplet on the inclined surface is affected by a constant gravity, the forward contact angle θa is larger than the backward contact angle θr. The small receding contact angle θr means that there is adhesion at the contact interface between the water droplet and the coating film 2, and the smaller the receding contact angle θr is, the closer the receding contact angle θr is to the advancing contact angle θa, Is easy to slide down, and the sliding angle α becomes small and the sliding property becomes high. For this reason, if the difference between the advancing contact angle θa and the receding contact angle θr is in the range of 0 to 20 °, it indicates high water slidability, and the difference between the advancing contact angle θa and the receding contact angle θr is 20 °. In the case of exceeding, it is difficult to roll and discharge the surface water and oil in a short time.

  In the present invention, the acrylic resin having a dimethylsilicon group can contain a fluorine-containing group in the resin skeleton. Examples of the fluorine-containing group include those represented by the above formulas (2) to (5), and can be bonded to the acrylic resin skeleton during the synthesis of the acrylic resin. In this way, by adding a fluorine-containing group to the acrylic resin, water repellency can be imparted to the surface of the coating film 2 in addition to water slidability. It can be rolled out and discharged in a state in which a part of the surface hardly remains on the surface, and can be removed from the surface of the drain in a short time. And since the fluorine-containing group is bonded to the acrylic resin, it is possible to obtain high water repellency durability.

  The content of the fluorine-containing group is preferably adjusted in the range of 1 to 70% by mass in the acrylic resin (including the side chain). As the amount of the fluorine-containing group increases, the durability of the water-repellent performance of the obtained coating film 2 is improved, and the heat resistance of hot water and the like is also improved. Especially in kitchen sinks, hot water etc. frequently acts, so it is preferable to adjust the content of fluorine-containing groups so as to be excellent in heat resistance, but if the content of fluorine-containing groups increases, the solvent of acrylic resin and Compatibility with other resins tends to decrease. For this reason, it is preferable to adjust content of a fluorine-containing group to the range of 1-70 mass% as mentioned above.

  In the present invention, the acrylic resin composition may contain dimethyl silicone oil. By containing dimethyl silicone oil in this way, silicon groups can be arranged more densely on the surface layer, and the water slidability of the coating film 2 can be further improved. Dimethyl silicone oil includes reactive ones having reactive groups that chemically react with other compounds and non-reactive ones in which reactive groups are blocked, both of which can be suitably used. Dimethyl silicone oil is more preferable because it does not easily fall off the coating film 2 and can maintain its effect. The basic structure of dimethyl silicone oil is as follows, and is roughly divided into double-end type, single-end type, side-chain type, and side-chain double-end type due to the difference in the bonding structure of reactive organic functional groups. The

  Examples of the organic functional group of R include an epoxy group, a carbinol group, a hydroxyl group, a carboxyl group, a silanol group, a polyether group, a mercapto group, and a phenol group, and examples thereof include a hydroxyl group, a carbinol group, and a silanol group. It is more preferable because it reacts with an isocyanate resin as a crosslinking agent.

  Next, the present invention will be specifically described with reference to examples.

(Example 1)
According to the blending amount in Table 1, an acrylic resin containing a dimethylsilicon group and a fluorine-containing group represented by formula (1) (“ZX-022H” manufactured by Fuji Chemical Industry Co., Ltd .: hydroxyl value 120, solid content 46% by mass) And a hydroxyl group-containing dimethyl silicone oil (“170DX” manufactured by Shin-Etsu Chemical Co., Ltd.) and a solution containing butyl acetate as a solvent. Next, an adduct of hexamethylene diisocyanate as an isocyanate resin as a cross-linking agent was added to this solution. "Sumijoule HT" manufactured by Kabaya Urethane Co., Ltd .: NCO content 13 mass%, solid content 75 mass%) was added to prepare an acrylic resin composition.

  This acrylic resin composition is applied to the surface of a stainless steel drain of a kitchen sink (of the type shown in FIG. 2B made of SUS304, the same applies below) by air spray so that the dry thickness is 3 μm. The film was formed by drying and curing at 80 ° C. for 30 minutes.

(Example 2)
An acrylic resin composition was prepared in accordance with the blending amount in Table 1 in which the blending amount of dimethyl silicone oil was less than that in Example 1, and this acrylic resin composition was coated on the surface of the stainless steel drain port in the same manner as in Example 1.

(Example 3)
An acrylic resin composition was prepared in accordance with the blending amount in Table 1 in which the blending amount of dimethyl silicone oil was larger than that in Example 1, and this acrylic resin composition was coated on the surface of the stainless steel drain port in the same manner as in Example 1.

Example 4
An acrylic resin composition was prepared according to the blending amount in Table 1 using butylated melamine resin (“Uban 225” manufactured by Mitsui Chemicals, Inc .: solid content 60% by mass) instead of isocyanate resin as a crosslinking agent. And this acrylic resin composition was apply | coated to the surface of the stainless steel drain outlet so that dry thickness might be set to 3 micrometers, and the coating film was formed by making it dry and harden | cure on the conditions of 150 degreeC x 30 minutes.

(Example 5)
An acrylic resin composition was prepared in accordance with the blending amount in Table 1 in which the blending amount of butylated melamine resin was larger than that in Example 4, and this acrylic resin composition was coated on the surface of the stainless steel drain port in the same manner as in Example 4. .

(Comparative Example 1)
The surface of the stainless steel drain of the kitchen sink was used as it was without being painted.

(Comparative Example 2)
The surface of the polypropylene drain of the kitchen sink was used without being painted.

(Comparative Example 3)
According to the blending amount in Table 1, xylene is added as a diluent to an acrylic resin containing no dimethylsilicon group (acrylic polyol “LR-199” manufactured by Mitsubishi Rayon Co., Ltd .: hydroxyl value 80, solid content 55 mass%), and An adduct of hexamethylene diisocyanate (the above-mentioned “Sumijoule HT”) was added as an isocyanate resin to prepare an acrylic resin composition. Then, this acrylic resin composition was coated on the surface of the stainless steel drain outlet in the same manner as in Example 1.

(Comparative Example 4)
Fluoro acrylic resin paint (Fluoro Technology Co., Ltd. “5030”: solid content 6 mass%) bonded with perfluoroolefin group instead of dimethylsilicon group was applied to the surface of the stainless steel drain port in the same manner as in Example 1. did.

(Comparative Example 5)
Commercially available fluororesin (“Fluonate K-704” manufactured by Dainippon Ink & Chemicals, Inc .: solid content 60% by mass), isocyanate resin (“Sumijour HT” above) as a crosslinking agent, butyl acetate and xylene as solvents Were mixed in the amounts shown in Table 1 to prepare a water / oil-repellent fluororesin composition. The water / oil repellent fluororesin composition was applied to the surface of the stainless steel drain port in the same manner as in Example 1.

  About the drainage port of said Examples 1-5 and Comparative Examples 1-5, the advancing contact angle, receding contact angle, stain resistance, and slime adhesion were tested and evaluated. The test method is as follows, and the results are shown in Table 1.

(1) Measurement of advancing / retreating contact angle The advancing contact angle and the receding contact angle were measured using a dynamic contact angle measuring device manufactured by Kyowa Interface Science Co., Ltd. The difference between the advancing and receding contact angles was obtained from the values of the advancing contact angle and the receding contact angle. In this test, a 150 × 170 mm SUS304 plate coated with the resin compositions of Examples 1 to 5 and Comparative Examples 3 to 5 or a SUS304 plate not coated (Comparative Example 1). A PP plate not coated (Comparative Example 2) was used.

(2) Contamination resistance One milliliter of a slime solution collected from a drain outlet of a sink that has been used for a long time was dropped into 1 liter of water to which nutrients were added to prepare a slime solution. Then, under an atmosphere of temperature 30 ° C. and humidity 90% RH, this slime solution was collected by flowing to the drain outlet of each Example and each Comparative Example, and further circulating and collecting for 1 week. . And the color difference (DELTA) E of the coating film of the drain port before circulating this slime solution and the drain port after circulating for one week was measured with the color difference meter, and it evaluated by the following criteria.

  ○: The color difference ΔE of the appearance of the coating film before and after the test is less than 1.

  Δ: The color difference ΔE of the appearance of the coating film before and after the test is 1 or more and less than 2.

  X: The color difference ΔE of the appearance of the coating film before and after the test is 2 or more.

(3) Adhesiveness of slime After the slime solution was circulated for one week as described above, the slime state was observed by touching the surface of the drainage port and evaluated according to the following criteria.

  ○: There is no slimy feeling with the touch of a finger, and no slime is generated.

  (Triangle | delta): There is a feeling of sliminess partially by finger touch, and slime has occurred.

  X: The surface has a slimy feeling when touched by a finger, the slime is generated, and the appearance is dirty.

  As can be seen from Table 1, the drain outlets of the respective examples in which the acrylic resin coating film bonded with the dimethylsilicon group was formed were less likely to be contaminated and could suppress the occurrence of slime.

(A) is a schematic diagram illustrating the behavior of water on the surface of the water slidable surface, (b) is a schematic diagram illustrating the behavior of water on the surface of the water-repellent surface, and (c) is a schematic diagram illustrating water on the surface of the hydrophilic surface. It is the schematic explaining a behavior. (A) (b) is sectional drawing of a drain outlet, respectively. It is the schematic explaining an advancing contact angle, a receding contact angle, and a fall angle.

Explanation of symbols

1 Drainage port member 2 Paint film

Claims (6)

A kitchen having water slidability, characterized in that the surface of the drain port member is coated with an acrylic resin composition having a dimethyl silicon group represented by the formula (1) at a content of 1 to 70% by mass. Drainage outlet.

The acrylic resin has at least one fluorine-containing group selected from the following formulas (2) to (5).

  The drain of a kitchen according to claim 1 or 2, wherein the acrylic resin composition contains dimethyl silicone oil.   4. The kitchen according to claim 1, wherein the coating film of the acrylic resin composition has a difference between the advancing contact angle and the receding contact angle of water within a range of 0 to 20 °. Drainage outlet.   The drain of a kitchen according to any one of claims 1 to 4, wherein the acrylic resin composition contains an isocyanate resin as a crosslinking agent for the acrylic resin.   The kitchen drain according to any one of claims 1 to 5, wherein the acrylic resin composition contains an amino resin as a crosslinking agent for the acrylic resin.

Images