JP5822556B2 - Kitchen sink - Google Patents

Kitchen sink Download PDF

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JP5822556B2
JP5822556B2 JP2011136062A JP2011136062A JP5822556B2 JP 5822556 B2 JP5822556 B2 JP 5822556B2 JP 2011136062 A JP2011136062 A JP 2011136062A JP 2011136062 A JP2011136062 A JP 2011136062A JP 5822556 B2 JP5822556 B2 JP 5822556B2
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sink
coating film
paragraph
kitchen
kitchen sink
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JP2013002196A (en
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輿石 謙二
謙二 輿石
洋一 村田
洋一 村田
鈴木 幸之助
幸之助 鈴木
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Lixil Corp
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Description

本発明は、シンク形状に絞り加工されたステンレス鋼材を基材としたキッチンシンクに関し、特に塗膜を被覆することでシンク底面部に開口した排水部周縁の腐食が防止されたキッチンシンクに関する。 The present invention, sink shape of the drawn stainless steel relates kitchen sink and the substrate, relates particularly kitchen sink corrosion of the drainage portion periphery which opens into the sink bottom portion by coating a coating film is prevented .

従来、ステンレス製流し台のシンク底部に開設された排水穴に、ゴミ籠を着脱自在に収納するゴミ籠収納器を落とし込み、これを固定してなるゴミ籠収納器が装着されてなるシンクが公知である。このようなゴミ籠収納器が装着されてなるシンクには、排水穴の開口周縁部とゴミ籠収納器のフランジの間に、水密性を確保する目的からゴム製或いは軟質合成樹脂で形成されたパッキンが介装されており、水密性に優れたパッキンが提案されている。(例えば、特許文献1参照)。   Conventionally, there has been known a sink in which a trash jar storage device for detachably storing trash trash is dropped into a drain hole provided at the bottom of the sink of a stainless steel sink, and a trash trash storage device is attached to fix the trash trash storage device. is there. The sink to which such a garbage container is mounted is formed of rubber or a soft synthetic resin between the peripheral edge of the drain hole and the flange of the garbage container for the purpose of ensuring watertightness. A packing is provided, and a packing excellent in water tightness has been proposed. (For example, refer to Patent Document 1).

また従来、ステンレス鋼製流し台において、キッチンシンクの耐食性をより高めるため、水分と接するキッチンシンクの表面に、有機無機複合クリア塗膜を被覆しているものがある(例えば、特許文献2参照)。   Conventionally, in a stainless steel sink, in order to further enhance the corrosion resistance of the kitchen sink, the surface of the kitchen sink in contact with moisture is coated with an organic-inorganic composite clear coating film (see, for example, Patent Document 2).

特許第4039473号公報(第2頁、第2図)Japanese Patent No. 4039473 (2nd page, FIG. 2) 特開2011−第38243号公報(第3頁)JP2011-38243A (page 3)

しかしながら、特許文献1に記載された水密性に優れたパッキンを使用しても、使用環境によっては、あるいはシンク材に使用されるステンレス鋼種の種類によって、例えば低価格であるが耐食性に劣るSUS430等の場合には、別段の耐食処理を施す必要が生じていた。特に、シンク底部に設けられた、前記ゴミ籠収納器を設置するための段落部の、前記パッキンとの隙間付近において重点的に耐食処理を要していた。   However, even if the packing excellent in water tightness described in Patent Document 1 is used, depending on the use environment or the type of stainless steel used for the sink material, for example, SUS430, which is low in price but inferior in corrosion resistance, etc. In this case, it was necessary to perform a separate anti-corrosion treatment. In particular, the anticorrosion treatment is required mainly in the vicinity of the gap between the packing portion and the paragraph portion provided on the sink bottom portion for installing the garbage basket storage device.

また一方で、特許文献2にあっては、キッチンシンクの材料となるステンレス基材の表面全面に亘り、耐水垢性と耐磨耗性に優れる有機無機複合クリア塗膜が被覆されており、また基材のステンレスも耐食性に優れたSUS304等が適用されているが、このようなキッチンシンクは塗布材料費等の製造コストが嵩むため、低価格帯商品としては採用できないという問題がある。   On the other hand, in Patent Document 2, the entire surface of the stainless steel base material that is the material of the kitchen sink is covered with an organic / inorganic composite clear coating film that is excellent in water resistance and abrasion resistance. SUS304, etc., which is excellent in corrosion resistance, is applied to the stainless steel of the base material, but such a kitchen sink has a problem that it cannot be adopted as a low-priced product because of high manufacturing costs such as coating material costs.

本発明は、このような問題点に着目してなされたもので、耐食性を十分に有するとともに低価格帯商品として適用できるキッチンシンクを提供することを目的とする。 The present invention has been made in view of such problems, and an object thereof is to provide a kitchen sink that can be applied as a low-end product which has a corrosion resistance sufficiently.

前記課題を解決するために、本発明のキッチンシンクは、
シンク形状に絞り加工されたステンレス鋼材を基材としたキッチンシンクにおいて、シンク底面部には、該シンク底面部よりも段落ちするとともに、排水トラップと水密に係合可能な内径方向に突出する突部を有し、前記突部の内端部が排水部として開口した段落部が前記キッチンシンクと一体に形成されており、該段落部のみが、耐食性を有する塗膜により被覆されていることを特徴としている。
この特徴によれば、キッチンシンクのシンク底面部よりも段落ちした排水部に向け排水が集中し、さらに排水トラップと水密に係合する突部を有する段落部のみが、耐食性を有する塗膜により被覆されていることで、キッチンシンクが高効率に耐食性を得られるばかりか、キッチンシンク全面に塗膜を被覆する場合に比べ製造コストを抑えることができるため、このキッチンシンクを比較的低価格帯の製品として提供できる。
In order to solve the above-described problem, the kitchen sink of the present invention includes:
In a kitchen sink using a stainless steel material drawn into a sink shape as a base material, the bottom surface of the sink is stepped down from the bottom surface of the sink and protrudes in the inner diameter direction so as to be watertightly engageable with the drain trap. A paragraph portion having an inner end portion of the protrusion as a drainage portion is formed integrally with the kitchen sink, and only the paragraph portion is covered with a corrosion-resistant coating film. It is a feature.
According to this feature, the drainage is concentrated toward the drainage part that has dropped from the bottom part of the sink of the kitchen sink, and only the paragraph part having the protrusion that is watertightly engaged with the drainage trap is formed by the coating film having corrosion resistance. This coating not only provides the kitchen sink with high-efficiency corrosion resistance, but also reduces manufacturing costs compared to coating the entire surface of the kitchen sink. Can be offered as a product.

本発明のキッチンシンクは、
前記塗膜は、前記段落部における前記排水部の内周面から前記シンク底面部への境界部まで連続して被覆していることを特徴としている。
この特徴によれば、塗膜が段落部における排水部の内周面からシンク底面部への境界部まで連続して被覆していることで、塗膜に塗りムラが生じた場合でも、段落部の全面に亘り確実に被覆できる。
The kitchen sink of the present invention
The coating film is characterized in that it continuously covers from the inner peripheral surface of the drainage part to the boundary part to the sink bottom surface part in the paragraph part.
According to this feature, the coating part continuously covers from the inner peripheral surface of the drainage part to the boundary part of the sink bottom part in the paragraph part, so even if the coating part has uneven coating, the paragraph part Can be reliably coated over the entire surface of the film.

本発明のキッチンシンクは、
前記塗膜は、ウレタンエマルジョン樹脂を主剤とする塗料からなり、該塗膜の膜厚が20μm以上であることを特徴としている。
この特徴によれば、ウレタンエマルジョン樹脂を主剤とすることで、キッチンシンクに要求される耐水性、耐熱性、耐薬品性、耐汚染性等を満足でき、且つ膜厚が20μm以上であるので、ステンレス鋼材の素地に対しピンホールの無い健全な塗膜を形成できる。
The kitchen sink of the present invention
The said coating film consists of a coating material which has urethane emulsion resin as a main ingredient, The film thickness of this coating film is 20 micrometers or more, It is characterized by the above-mentioned.
According to this feature, water resistance, heat resistance, chemical resistance, stain resistance, etc. required for kitchen sinks can be satisfied by using urethane emulsion resin as the main ingredient, and the film thickness is 20 μm or more. A healthy coating film without pinholes can be formed on a stainless steel substrate.

本発明のキッチンシンクは、
前記塗膜は、前記主剤に混合されるカップリング剤として、エポキシ基含有シランカップリング剤を有していることを特徴としている。
この特徴によれば、カップリング剤としてのエポキシ基含有シランカップリング剤と、主剤であるウレタンエマルジョン樹脂との反応により、架橋密度の高い塗膜が得られる。
The kitchen sink of the present invention
The coating film has an epoxy group-containing silane coupling agent as a coupling agent mixed with the main agent.
According to this feature, a coating film having a high crosslinking density can be obtained by a reaction between the epoxy group-containing silane coupling agent as the coupling agent and the urethane emulsion resin as the main agent.

実施例1におけるキッチンシンクを示す縦断側面図である。It is a vertical side view which shows the kitchen sink in Example 1. FIG. 実施例1におけるキッチンシンクの段落部の断面図である。It is sectional drawing of the paragraph part of the kitchen sink in Example 1. FIG. 実施例1における段落部の塗膜を示す要部拡大断面図である。3 is an enlarged cross-sectional view of a main part showing a coating film of a paragraph part in Example 1. FIG. (a)は、被覆態様の変形例における段落部の塗膜を示す要部拡大断面図であり、(b)は、被覆領域の変形例における段落部の塗膜を示す要部拡大断面図である。(A) is a principal part expanded sectional view which shows the coating film of the paragraph part in the modification of a coating aspect, (b) is a principal part expanded sectional view which shows the coating film of the paragraph part in the modification of a coating area | region. is there.

本発明に係るキッチンシンクを実施するための形態を実施例に基づいて以下に説明する。   The form for implementing the kitchen sink which concerns on this invention is demonstrated below based on an Example.

実施例1に係るキッチンシンクにつき、図1から図4を参照して説明する。先ず図1の符号1は、台所に配設される本発明のキッチンである。このキッチン1には、シンク2が設けられており、シンク底面部2aには、このシンク底面部2aよりも一段下方に段落ちした段落部10が連続形成されている。シンク底面部2a及び段落部10が形成されたシンク2は、例えばSUS430等の比較的廉価なステンレス鋼板を基材とし、当該シンク形状に絞り加工されたものである。   The kitchen sink according to the first embodiment will be described with reference to FIGS. First, reference numeral 1 in FIG. 1 is a kitchen of the present invention disposed in a kitchen. The kitchen 1 is provided with a sink 2, and the sink bottom surface portion 2 a is continuously formed with a paragraph portion 10 that is stepped down one step below the sink bottom surface portion 2 a. The sink 2 in which the sink bottom surface portion 2a and the paragraph portion 10 are formed is made of a relatively inexpensive stainless steel plate such as SUS430 as a base material and drawn into the sink shape.

段落部10には排水トラップ3が配置され、この排水トラップ3には、シンク底面部2a下方において、床下に配設される図示しない下水管に通じる排水管4が水密に接続されている。尚、キッチン1前面側には、シンク2下方の収納空間5を開放させることができる扉6が取り付けられている。   A drainage trap 3 is disposed in the paragraph 10, and a drainage pipe 4 that leads to a drain pipe (not shown) disposed below the floor is connected to the drainage trap 3 in a watertight manner below the sink bottom surface 2 a. In addition, the door 6 which can open the storage space 5 under the sink 2 is attached to the kitchen 1 front side.

図2に示されるように、段落部10は、シンク底面部2aに連続して比較的緩やかに段落ちする境界部14,14’と、この境界部14,14’に連続して比較的急峻に段落ちする平面視略円形の周壁からなり下方に向け漸次縮径して延びる筒部11,11’と、筒部11,11’下端に連続して内径方向に突出する突部12,12’とを有し、突部12の内端部が上下に開口した排水部13として形成されている。尚、図2に示されるように、本実施例の筒部11,11’の断面形状は、段落部10の周方向に均一形状ではなく、シンク2前側の筒部11’は後側の筒部11よりも上下に長寸に延びている。   As shown in FIG. 2, the paragraph portion 10 includes boundary portions 14 and 14 ′ that are stepped down relatively gently continuously to the sink bottom surface portion 2a, and a relatively steep portion that is continuous to the boundary portions 14 and 14 ′. The cylindrical portions 11 and 11 ', which are formed from a substantially circular peripheral wall stepped down in a plan view and are gradually reduced in diameter downward, and the protruding portions 12 and 12 projecting in the inner diameter direction continuously from the lower ends of the cylindrical portions 11 and 11'. , And the inner end portion of the protrusion 12 is formed as a drainage portion 13 opened up and down. As shown in FIG. 2, the cross-sectional shape of the cylindrical portions 11 and 11 ′ of this embodiment is not uniform in the circumferential direction of the paragraph portion 10, and the cylindrical portion 11 ′ on the front side of the sink 2 is the rear side cylinder. It extends longer than the portion 11 in the vertical direction.

またシンク底面部2aは、その上面が段落部10に向け漸次緩やかに下方に傾斜して形成され、シンク底面部2a上面の排水が、段落部10の排水部13に導かれ集まるようになっている。   Further, the sink bottom surface portion 2a is formed so that the upper surface thereof is gradually inclined downward toward the paragraph portion 10, and the drainage of the upper surface of the sink bottom surface portion 2a is guided to the drainage portion 13 of the paragraph portion 10 and gathers. Yes.

図3に示されるように、この段落部10の突部12上面12a及び筒部11内周面11aは、その全面に亘り後述する耐食性を有する塗膜Tにより被覆されている。   As shown in FIG. 3, the protrusion 12 upper surface 12a and the cylindrical portion 11 inner peripheral surface 11a of the paragraph portion 10 are covered with a coating film T having corrosion resistance described later over the entire surface.

尚、排水トラップ3は、有底円筒状であって排水管4に連通形成されたトラップ本体8を有し、このトラップ本体8の上端に拡径形成された鍔部8aが防水用のパッキン材15を介して段落部10の突部12に水密に係合するとともに、突部12下方にてフランジ7と螺合してシンク2に組み付けられており、更にトラップ本体8の上端に連通する側方の開口部8bが、パッキンリング21を介し螺合したスリーブ20により排水管4と接続されている。   The drain trap 3 has a trap body 8 which has a bottomed cylindrical shape and is formed in communication with the drain pipe 4, and a flange 8 a having an enlarged diameter formed at the upper end of the trap body 8 is a packing material for waterproofing. 15 is engaged with the projecting portion 12 of the paragraph portion 10 through water 15 and is screwed into the flange 7 below the projecting portion 12 and assembled to the sink 2. Further, the side communicating with the upper end of the trap body 8. The other opening portion 8 b is connected to the drain pipe 4 by a sleeve 20 screwed through a packing ring 21.

次に、本実施例で適用される塗膜Tが被覆されたシンク2の製造方法について説明する。上述したように、シンク形状に絞り加工されたステンレス鋼材を基材とし、シンク底面部2aには、このシンク底面部2aよりも段落ちするとともに排水部13が開口した段落部10が形成されたシンク2を用いる。先ず、段落部10まわりのシンク底面部2aに予めマスキングを施し、この段落部10に耐食性を有する塗料を吹付塗装し、後に前記したマスキングを剥がすことで、段落部10に塗膜Tが被覆されるようになっている。   Next, a method for manufacturing the sink 2 coated with the coating film T applied in this embodiment will be described. As described above, a stainless steel material drawn into a sink shape is used as a base material, and the bottom portion 2a of the sink is formed with a paragraph portion 10 that is stepped down from the bottom surface portion 2a of the sink and has an open drainage portion 13. Sink 2 is used. First, the sink bottom surface portion 2a around the paragraph portion 10 is masked in advance, and the paragraph portion 10 is spray-coated with a paint having corrosion resistance, and the coating portion T is coated on the paragraph portion 10 by peeling off the masking described later. It has become so.

上記したシンク2の製造方法によれば、段落部10まわりのシンク底面部2aにマスキングを施し、吹付塗装後に剥がすことで、排水が集中する段落部10のみを、作業手間をかけること無く耐食性を有する塗膜Tにより被覆することができ、シンク2が高効率に耐食性を得て且つ製造コストを抑えることができるため、このシンク2を比較的低価格帯の製品として提供できる。   According to the manufacturing method of the sink 2 described above, the sink bottom surface portion 2a around the paragraph portion 10 is masked and peeled off after spray coating, so that only the paragraph portion 10 where drainage is concentrated can be made resistant to corrosion without much work. The sink 2 can be coated with the coating film T, and the sink 2 can obtain corrosion resistance with high efficiency and suppress the manufacturing cost. Therefore, the sink 2 can be provided as a relatively low-priced product.

次に、本実施例で適用される塗膜Tの被覆態様について、図3及び図4(a),(b)を参照して詳述する。尚、図3及び図4(a),(b)では、シンク2後側の筒部11及び突部12からなる段落部10の断面形状を示しているが、前側の筒部11’及び突部12’からなる段落部10についても同様の被覆態様であるとする。   Next, the coating mode of the coating film T applied in the present embodiment will be described in detail with reference to FIG. 3 and FIGS. 4 (a) and 4 (b). 3 and 4 (a) and 4 (b) show the cross-sectional shape of the paragraph portion 10 including the cylindrical portion 11 and the protruding portion 12 on the rear side of the sink 2, the cylindrical portion 11 'and the protruding portion on the front side are shown. It is assumed that the paragraph portion 10 composed of the portion 12 ′ has the same covering mode.

先ず図3に示されるように、本実施例における塗膜Tの被覆領域について説明すると、塗膜Tは、段落部10の突部12の上面12aから連続して筒部11の内周面11aまでの全面領域に亘り、後述する好適な20μm以上の膜厚で被覆している。   First, as shown in FIG. 3, the coating region of the coating film T in the present embodiment will be described. The coating film T is continuously formed from the upper surface 12 a of the projecting portion 12 of the paragraph portion 10 and the inner peripheral surface 11 a of the cylindrical portion 11. The entire surface area is covered with a film thickness of 20 μm or more which will be described later.

尚、塗膜の被覆態様の変形例として、図4(a)に示されるように、塗膜Tの被覆対象となる例えば段落部10の突部12の上面12aから筒部11の内周面11aまでに亘る表面を、粗面Qとする粗面処理を予め施し、当該粗面処理の後に塗膜Tを被覆してもよく、このようにすることで粗面処理を施した粗面Qに塗膜Tが長期間に渡り被覆して、塗膜Tが剥れてしまう虞を回避できる。   In addition, as a modification of the coating mode of the coating film, as shown in FIG. 4A, the inner peripheral surface of the cylindrical portion 11 from the upper surface 12a of the projection 12 of the paragraph portion 10 to be coated with the coating film T, for example. The surface up to 11a may be previously subjected to a rough surface treatment to make the rough surface Q, and the coating film T may be coated after the rough surface treatment, and in this way, the rough surface Q subjected to the rough surface treatment. It is possible to avoid the possibility that the coating film T is coated over a long period of time and the coating film T is peeled off.

また、塗膜の被覆領域の変形例として、図4(b)に示されるように、塗膜T’が、段落部10の排水部13の内周面13aから、突部12の上面12a、筒部11の内周面11a、更にシンク底面部2aへの境界部14の上面までに亘る連続した領域を被覆するようにしてもよい。尚、上記した境界部14は、シンク底面部2aに連続して移行する部分を意味するが、より具体的には、筒部11の段落ち寸法よりも短寸であることが好ましい。   Moreover, as a modification of the coating region of the coating film, as shown in FIG. 4B, the coating film T ′ extends from the inner peripheral surface 13 a of the drainage portion 13 of the paragraph portion 10 to the upper surface 12 a of the protrusion 12. You may make it coat | cover the continuous area | region covering the inner peripheral surface 11a of the cylinder part 11, and also to the upper surface of the boundary part 14 to the sink bottom face part 2a. In addition, although the above-mentioned boundary part 14 means the part which transfers to the sink bottom face part 2a continuously, it is preferable that it is shorter than the stepped dimension of the cylinder part 11 more specifically.

図4(b)に示す塗膜の被覆領域の変形例のように、塗膜T’が排水部13の内周面13aから、突部12の上面12a、筒部11の内周面11a、更にシンク底面部2aへの境界部14の上面までに至る連続した領域を被覆していることで、塗膜T’に塗りムラが生じた場合でも、段落部10の全面に亘り確実に被覆できる。   As in the modification example of the coating region of the coating film shown in FIG. 4B, the coating film T ′ extends from the inner peripheral surface 13a of the drainage part 13 to the upper surface 12a of the projecting part 12, the inner peripheral surface 11a of the cylindrical part 11, Further, by covering a continuous region extending to the upper surface of the boundary portion 14 to the sink bottom surface portion 2a, even when coating unevenness occurs in the coating film T ′, the entire surface of the paragraph portion 10 can be reliably coated. .

尚、上記した被覆領域の変形例において、特に図示しないが、被覆領域となる段落部10の排水部の内周面13aから、突部12の上面12a、筒部11の内周面11a、更にシンク底面部2aへの境界部14の上面までに至る連続した領域を、粗面とする粗面処理を予め施すようにしてもよく、このようにすることで、粗面処理を施した表面に塗膜が長期間に渡りしっかりと被覆して、塗膜が剥れてしまう虞を十分に回避できる。   In the above-described modification of the covering region, although not particularly illustrated, from the inner peripheral surface 13a of the drainage portion of the paragraph 10 serving as the covering region, the upper surface 12a of the protrusion 12, the inner peripheral surface 11a of the cylindrical portion 11, and Rough surface treatment may be performed in advance so that the continuous region extending to the upper surface of the boundary portion 14 to the sink bottom surface portion 2a is roughened, and in this way, the surface subjected to the rough surface treatment is treated. It is possible to sufficiently avoid the possibility that the coating film is firmly covered over a long period of time and the coating film is peeled off.

次に、本実施例のシンク2の段落部10を被覆した塗膜、すなわち耐食性及び耐水密性に優れたウレタンエマルジョン樹脂系塗膜について説明する。   Next, the coating film which coat | covered the paragraph part 10 of the sink 2 of a present Example, ie, the urethane emulsion resin-type coating film excellent in corrosion resistance and water resistance, is demonstrated.

(主樹脂)
塗膜Tの主樹脂であるエマルジョン樹脂に関しては、一般的にはエポキシ樹脂、アクリル樹脂、ポリエステル樹脂、ウレタン樹脂などがあるが、本用途であるキッチンシンクのように、耐水性、耐熱性、耐薬品性、耐汚染性などが要求される過酷な環境下に於いて、要求特性を満足できる樹脂はウレタン樹脂をおいて他にない。エポキシ樹脂は基材であるステンレスに対する初期の密着性に優れるものの、耐水性や長期の耐久性に劣る。また、アクリル樹脂やポリエステル樹脂は耐水性に優れるものの、耐薬品性に劣る。一方、ウレタン樹脂は耐水性にも耐薬品性にも優れる。ただし、どのようなウレタンエマルジョン樹脂でも良いというわけではない。その理由は、使用されるシンクの環境は、水を使用したりお湯を使用したりとステンレスシンク自体が伸縮・膨張を繰り返す。そうした素地に対しては、より追従性の高い柔軟性のあるウレタン樹脂が望ましい。そうした柔軟性のあるウレタン樹脂としては、伸び率が150%以上である必要がある。その結果、柔軟な塗膜が形成されて、伸縮・膨張を繰り返す素材に対して追従して耐久性に優れた塗膜が得られる。伸び率が150%未満では柔軟性に乏しく、伸縮・膨張を繰り返す素材に対して追従できず耐久性に優れた塗膜が得られない。
(Main resin)
As for the emulsion resin that is the main resin of the coating film T, there are generally epoxy resin, acrylic resin, polyester resin, urethane resin, etc., but water resistance, heat resistance, There is no other resin, such as urethane resin, that can satisfy the required characteristics in harsh environments where chemical properties and stain resistance are required. Epoxy resins have excellent initial adhesion to stainless steel as a base material, but are inferior in water resistance and long-term durability. Moreover, although acrylic resin and polyester resin are excellent in water resistance, they are inferior in chemical resistance. On the other hand, urethane resin is excellent in water resistance and chemical resistance. However, not all urethane emulsion resins are acceptable. The reason for this is that the stainless sink itself repeatedly expands and contracts and expands when water is used or hot water is used. For such a substrate, a flexible urethane resin with higher followability is desirable. Such a flexible urethane resin needs to have an elongation of 150% or more. As a result, a flexible coating film is formed, and a coating film having excellent durability is obtained by following a material that repeatedly expands and contracts. If the elongation is less than 150%, the flexibility is poor, and it is impossible to follow a material that repeatedly expands and contracts, and a coating film having excellent durability cannot be obtained.

一方、塗膜に水分が浸入する(透水すると)と塗膜を膨潤させる。塗膜が膨潤すると、塗膜とステンレス鋼板との界面に膨潤力が作用して密着力を低下させると考える。そのため、塗膜を膨潤させないためには、まずは透水性の低い塗膜であることが第1である。さらに、塗膜の膨潤を防ぐためには、塗膜が強靭である事が必要である。そのためには、伸び率のみならず、引張り強度も高くないといけない。塗膜に水が浸入してきて、塗膜を膨潤させようとする時にそれを防ぐためには、引張り強度が400kg/cm2である必要がある。引張り強度が 400kg/cm2未満では強靭な塗膜が得られず、水分の浸入に耐えられず膨潤してしまい、素地に対する密着性が低下してしまう。   On the other hand, when moisture enters the coating film (permeates water), the coating film is swollen. When the coating film swells, it is considered that the swelling force acts on the interface between the coating film and the stainless steel plate to reduce the adhesion. Therefore, in order not to swell the coating film, it is first that the coating film has low water permeability. Furthermore, in order to prevent swelling of the coating film, it is necessary that the coating film is tough. For this purpose, not only the elongation but also the tensile strength must be high. In order to prevent water from entering the coating film and causing the coating film to swell, the tensile strength needs to be 400 kg / cm 2. If the tensile strength is less than 400 kg / cm <2>, a tough coating film cannot be obtained, cannot withstand the ingress of moisture, swells, and the adhesion to the substrate decreases.

従って、ウレタンエマルジョン樹脂の機械的性質として、伸び率が150%以上、引張り強度が400kg/cm2以上であることが必要である。   Therefore, as the mechanical properties of the urethane emulsion resin, it is necessary that the elongation is 150% or more and the tensile strength is 400 kg / cm 2 or more.

(カップリング剤)
カップリング剤もシラン系、アルミ系、チタン系など色々な物が公知であるが、本用途に対しては、シラン系カップリング剤が適している。加水分解により生成された水酸基がステンレス表面に強固に結合して耐水性に優れた密着性を提供する。また、有機官能基としては、ビニル基、エポキシ基、メタクリル基、アクリル基、アミン基などが上げられるが、その中でもエポキシ基を有機官能基として有するシランカップリング剤が特に良い。
(Coupling agent)
Various coupling agents such as silane, aluminum and titanium are known, but silane coupling agents are suitable for this application. Hydroxyl groups produced by hydrolysis are firmly bonded to the stainless steel surface to provide adhesiveness with excellent water resistance. Examples of the organic functional group include a vinyl group, an epoxy group, a methacryl group, an acrylic group, and an amine group. Among them, a silane coupling agent having an epoxy group as an organic functional group is particularly preferable.

具体的には、2−(3,4−エポキシシクロへキシル)エチルトリメトキシシラン、3−グリシドキシプロピルトリメトキシシラン、3−グリシドキシプロピルメチルジエトキシシラン、3−グリシドキシプロピルトリエトキシシランなどが上げられる。   Specifically, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltri Examples include ethoxysilane.

上記カップリング剤を使用すると、カップリング剤のエポキシ基と主樹脂であるウレタンエマルジョン樹脂の水素との間で付加反応が起こり、架橋密度の高い塗膜が得られる。また、更にはシランカップリング剤の水酸基とウレタンエマルジョン樹脂の水素の結合による脱水縮合反応も起きていると考えられ、さらに架橋反応が進んで架橋密度の高い塗膜が得られる。その結果、シンクのような厳しい耐水性が要求される用途においても、水分の透過を防止し、耐水性に優れた塗膜を提供できる。さらに、カップリング剤の加水分解により生成された水酸基はステンレス表面と強固に結合することから、下地ステンレスに対して強固な密着性を有する塗膜を提供できる。   When the above coupling agent is used, an addition reaction occurs between the epoxy group of the coupling agent and hydrogen of the urethane emulsion resin as the main resin, and a coating film having a high crosslinking density is obtained. Further, it is considered that a dehydration condensation reaction is caused by the bonding of the hydroxyl group of the silane coupling agent and the hydrogen of the urethane emulsion resin, and the crosslinking reaction further proceeds to obtain a coating film having a high crosslinking density. As a result, it is possible to provide a coating film excellent in water resistance by preventing the permeation of moisture even in applications such as a sink where strict water resistance is required. Furthermore, since the hydroxyl group produced | generated by the hydrolysis of a coupling agent couple | bonds firmly with the stainless steel surface, the coating film which has strong adhesiveness with respect to base stainless steel can be provided.

(その他添加剤)
その他塗膜として添加される物としては、色を付けるための着色剤、塗装時の塗膜の平坦性を上げるレベリング剤、塗料の攪拌時あるいは塗装時に発生する泡を消す働きのある消泡剤などがある。また、光沢を調整するためにつや消し剤も添加しても良い。
(Other additives)
Others added as a paint film include colorants for coloring, leveling agents that increase the flatness of the paint film during painting, and antifoaming agents that work to eliminate foam generated during paint stirring or painting. and so on. Further, a matting agent may be added to adjust the gloss.

また、主樹脂に対するカップリング剤とその他の添加剤の添加量に関しては、主剤のウレタンエマルジョン樹脂固形分:100質量%に対して,カップリング剤:3〜30質量%,その他添加剤(着色剤、レベリング剤、消泡剤など):3〜30質量%が望ましい。カップリング剤が3質量%未満では、その効果が不十分であり、30%を超えても性能上は変わらず、カップリング剤は一般的に高価であるので、コストに影響する。その他添加剤に関しては、適宜入れれば良いが、レベリング剤は0.3%〜6%、消泡剤であれば0.3%〜3%程度が一般的には良い。   Moreover, regarding the addition amount of the coupling agent and other additives with respect to the main resin, the coupling agent: 3 to 30% by mass, other additives (colorants, relative to the main component urethane emulsion resin solid content: 100% by mass , Leveling agent, antifoaming agent, etc.): 3 to 30% by mass is desirable. If the coupling agent is less than 3% by mass, the effect is insufficient, and if it exceeds 30%, the performance does not change, and the coupling agent is generally expensive, which affects the cost. Other additives may be added as appropriate, but generally, the leveling agent is 0.3% to 6%, and the antifoaming agent is generally about 0.3% to 3%.

また、塗料の塗装方法は、ステンレス素地を清浄にした上で、ハケまたはスプレー塗装を行う。乾燥条件は120℃×10分程度の強制乾燥が望ましいが、それだけの時間が取れない場合には、ドライヤーで塗料が垂れない程度に水を蒸発させてから、その後常温で硬化させても良い。塗膜厚に関しては、20μm以上が望ましい。すなわち、20μm未満だとステンレス鋼材の素地に対してピンホールの無い健全な保護膜が形成しづらく、欠陥部分から腐食成分が侵入して、ステンレス素地を腐食したり、水分が浸入することにより、塗膜剥れの問題が生ずるが、膜厚が20μm以上であれば、ステンレス鋼材の素地に対しピンホールの無い健全な塗膜を形成できる。   The paint is applied by brushing or spraying after the stainless steel substrate is cleaned. As drying conditions, forced drying at about 120 ° C. for about 10 minutes is desirable. However, when it is not possible to take the time, water may be evaporated to such an extent that the paint does not drip with a dryer, and then cured at room temperature. The coating thickness is preferably 20 μm or more. That is, if it is less than 20 μm, it is difficult to form a healthy protective film without pinholes on the base material of stainless steel material, corrosive components enter from the defective part, corroding the stainless base material, or moisture entering. Although the problem of peeling of the coating film occurs, if the film thickness is 20 μm or more, a healthy coating film having no pinholes can be formed on the base of the stainless steel material.

このとき、薄く着色した塗料を使えば、当該塗料の着色具合により十分な膜厚を塗装したか否か目視で確認できる。尚、段落部10は、通常の使用時ではトラップ本体8の鍔部8aで覆われ露出しないので、着色しても問題は生じない。段落部10まわりのシンク底面部2aは、マスキングにより着色を防ぐことができる。   At this time, if a lightly colored paint is used, it can be visually confirmed whether or not a sufficient film thickness is applied depending on the color of the paint. In addition, since the paragraph part 10 is covered with the collar part 8a of the trap main body 8 and is not exposed during normal use, there is no problem even if it is colored. The sink bottom surface portion 2a around the paragraph portion 10 can be prevented from being colored by masking.

本発明の耐食性及び耐水密着性に優れた上述のウレタンエマルジョン樹脂系塗膜が被覆されたシンク2の排水部13が開口した段落部10は、腐食性の厳しい環境に置かれても、腐食され難い。   The paragraph part 10 in which the drainage part 13 of the sink 2 covered with the above-mentioned urethane emulsion resin coating film excellent in corrosion resistance and water adhesion of the present invention is opened is corroded even if placed in a corrosive environment. hard.

(ウレタンエマルジョン樹脂系塗料の調製)
下記の配合表 表1のように塗料の調製を行った。カップリング剤の添加量を3水準として、ウレタンエマルジョン樹脂系塗料3種類を得た。なお、ここでのウレタンエマルジョン樹脂の不揮発分は30%である。
(Preparation of urethane emulsion resin paint)
The following recipe was prepared as shown in Table 1. Three types of urethane emulsion resin-based paints were obtained with three levels of coupling agent added. The non-volatile content of the urethane emulsion resin here is 30%.

Figure 0005822556
Figure 0005822556

塗装原板には板厚:0.7mmのSUS430 No.9仕上げのステンレス鋼板を用い、シンク形状に絞り加工した(図1及び図2参照)。成形後のシンク2の基材をアルカリ脱脂した後、上記ウレタンエマルジョン樹脂系塗料3種類をシンクの排水部13を有する段落部10にスプレー塗布し、その後ドライヤーで水を蒸発させてから常温で乾燥硬化させた。なお、乾燥膜厚は25μmとした。   A stainless steel plate finished with SUS430 No. 9 having a thickness of 0.7 mm was used as the coating original plate and drawn into a sink shape (see FIGS. 1 and 2). After demolding the base material of the sink 2 after molding, the above three types of urethane emulsion resin-based paints are spray-applied to the paragraph part 10 having the sink drain part 13 of the sink, and then water is evaporated with a dryer and then dried at room temperature. Cured. The dry film thickness was 25 μm.

なお、ここで使用したウレタンエマルジョン樹脂は、実施例3の実験No.7と同じ樹脂を使用し、この樹脂の機械的性質は伸び率200%、引張り強度450kg/cm2である。   In addition, the urethane emulsion resin used here uses the same resin as Experiment No. 7 of Example 3, and the mechanical properties of this resin are an elongation of 200% and a tensile strength of 450 kg / cm 2.

シンク2の段落部10は筒部11と突部12から構成されるが、腐食による穴開きは実際には筒部11及び突部12共に認められる事から、塗膜Tは筒部11及び突部12の両方共に被覆される(図3参照)。   Although the paragraph part 10 of the sink 2 is composed of a cylindrical part 11 and a protruding part 12, since the hole due to corrosion is actually recognized in both the cylindrical part 11 and the protruding part 12, the coating film T has a cylindrical part 11 and a protruding part. Both parts 12 are coated (see FIG. 3).

塗装されたステンレス鋼製シンク2の排水部13が開口した段落部10から試験片を切り出し、耐温水性試験、耐洗剤性試験に供した。   A test piece was cut out from the paragraph portion 10 where the drainage portion 13 of the coated stainless steel sink 2 was opened, and subjected to a hot water resistance test and a detergent resistance test.

〔耐温水性試験〕
80℃の温水にサンプルを168時間連続浸漬した後、乾燥し、テープ剥離試験で温水環境下での塗膜密着性を調査した。10面積%以上の剥離が生じた塗膜を×,点状に剥離した塗膜を△,全く剥離しなかった塗膜を○として耐温水性を評価した。
[Temperature resistance test]
The sample was continuously immersed in 80 ° C. hot water for 168 hours, then dried, and the adhesion of the coating film in a hot water environment was examined by a tape peeling test. The hot water resistance was evaluated with a coating film with peeling of 10% by area or more being evaluated as “x”, a coating film peeled off in a dotted manner as “Δ”, and a coating film without peeling at all as “◯”.

〔耐洗剤性試験〕
市販の洗剤A(K社製)と洗剤B(U社製)をそれぞれサンプル塗膜表面に1CC滴下し、24時間放置する。その後水道水で洗浄後、外観確認を行い異常が無いか確認する。これを4回、96時間繰り返し行う。塗膜が剥げた場合は×、塗膜にシミ、変色などの外観変化が見られた場合は△、全く異常が無かった場合は○として耐洗剤性を評価した。
[Detergent resistance test]
1 CC of commercially available detergent A (manufactured by K company) and detergent B (manufactured by U company) are dropped on the surface of the sample coating film and left for 24 hours. After washing with tap water, check the appearance and check for any abnormalities. This is repeated 4 times for 96 hours. Detergent resistance was evaluated as x when the coating film was peeled off, Δ when the coating film was changed in appearance such as a stain or discoloration, and ◯ when there was no abnormality.

Figure 0005822556
Figure 0005822556

表2の試験結果通り、シランカップリング剤の添加量が0.5%と少ない実験No.1では耐温水性試験、耐洗剤性試験のいずれでも不良の結果となった。一方、添加量が2%以上であるNo.2とNo.3のサンプルは、耐温水性試験、耐洗剤性試験のいずれでも良好な結果となった。   As shown in the test results in Table 2, in Experiment No. 1, where the addition amount of the silane coupling agent was as low as 0.5%, both the warm water resistance test and the detergent resistance test resulted in poor results. On the other hand, the samples No. 2 and No. 3 having an addition amount of 2% or more gave good results in both the warm water resistance test and the detergent resistance test.

表1の実験No.2の塗料を用いて、実施例1と同様の手順でシンク2の排水部13が開口した段落部10に膜厚が異なる3水準(10μm、20μm、30μm)で塗装を行い、段落部10から試験片を切り出し、耐温水性試験、耐洗剤性試験に供した。   Using the paint of Experiment No. 2 in Table 1, painting is performed at three levels (10 μm, 20 μm, 30 μm) with different thicknesses on the paragraph part 10 where the drainage part 13 of the sink 2 is opened in the same procedure as in Example 1. The test piece was cut out from the paragraph 10 and subjected to a hot water resistance test and a detergent resistance test.

Figure 0005822556
Figure 0005822556

表3の試験結果通り、膜厚が10μmと薄い実験No.4では耐温水性試験、耐洗剤性試験のいずれでも不良の結果となった。一方、膜厚が20μm以上であるNo.5とNo.6のサンプルは、耐温水性試験、耐洗剤性試験のいずれでも良好な結果となった。   As shown in the test results of Table 3, in Experiment No. 4 where the film thickness was as thin as 10 μm, both the warm water resistance test and the detergent resistance test showed poor results. On the other hand, the samples No. 5 and No. 6 having a film thickness of 20 μm or more gave good results in both the warm water resistance test and the detergent resistance test.

下表4の通り、伸び率と引張り強度の異なる2種類のウレタンエマルジョン樹脂を用いた塗料組成の塗料を用いて、実施例1と同様の手順でシンク2の段落部10に膜厚が20μmとなるように塗装を行い、段落部10から試験片を切り出し、耐温水性試験、耐洗剤性試験に供した。なお、ウレタンエマルジョン樹脂2種類の不揮発分はいずれも30%である。   As shown in Table 4 below, using a paint having a paint composition using two types of urethane emulsion resins having different elongation rates and tensile strengths, the thickness of the paragraph portion 10 of the sink 2 is 20 μm in the same procedure as in Example 1. It coated so that it might become, and the test piece was cut out from the paragraph part 10, and it used for the warm water resistance test and the detergent resistance test. Note that the nonvolatile content of the two types of urethane emulsion resins is 30%.

Figure 0005822556
Figure 0005822556

Figure 0005822556
Figure 0005822556

表5の試験結果通り、伸び率が200%、引張り強度が450kg/cm2の実験No.7は耐温水性試験、耐洗剤性試験のいずれでも良好な結果となった。一方伸び率が100%、引張り強度が300kg/cm2の実験No.8は、耐温水性試験、耐洗剤性試験のいずれでも不良な結果となった。   As shown in the test results of Table 5, Experiment No. 7 having an elongation of 200% and a tensile strength of 450 kg / cm 2 gave good results in both the hot water resistance test and the detergent resistance test. On the other hand, Experiment No. 8 with an elongation of 100% and a tensile strength of 300 kg / cm 2 gave poor results in both the hot water resistance test and the detergent resistance test.

実施例3の実験No.7と同じ塗装品と無塗装品(板厚:0.7mmのSUS430 No.9仕上げのステンレス鋼板)の排水口を準備して、ごみ籠収納器をそれぞれのシンク排水口にゴムパッキンを介して締付けリングにより取付けて、耐食性の試験に供した。   Prepare drains for painted and unpainted products (thickness: SUS430 No. 9 stainless steel plate with a thickness of 0.7 mm) as in Experiment No. 7 in Example 3, and separate the waste bins into each sink drain. It was attached to the mouth with a fastening ring via a rubber packing and subjected to a corrosion resistance test.

〔耐食性試験〕
下記の環境条件下にサンプルを置いて、順次サイクル的に環境を変えて、1回の環境サイクルを1サイクルとして、50サイクルまで試験を行い、評価は発錆状況と腐食の最大浸食深さを測定した。
[Corrosion resistance test]
The sample is placed under the following environmental conditions, and the environment is changed in order, and the test is performed up to 50 cycles with one environmental cycle as one cycle. Evaluation is based on the rusting situation and the maximum corrosion depth of corrosion. It was measured.

(1)塩水噴霧(5%NaCl、35℃×15min)→(2)乾燥(30%R.H.、60℃×1h)→(3)湿潤(95%R.H.、50℃×3h)→ここまでで、1サイクル。(1)に戻る。
50サイクルの試験の結果、実験No.7の塗装品は全く錆が認められなかった。一方、無塗装品は、パッキン最外周部で部分的に腐食が発生しており、最大侵食深さは0.16mmであった。この結果からも塗装品は耐食性に極めて優れる事が分かった。
(1) Salt spray (5% NaCl, 35 ° C. × 15 min) → (2) Dry (30% RH, 60 ° C. × 1 h) → (3) Wet (95% RH, 50 ° C. × 3 h) → 1 cycle. Return to (1).
As a result of the 50-cycle test, no rust was observed in the painted product of Experiment No. 7. On the other hand, the uncoated product was partially corroded at the outermost periphery of the packing, and the maximum erosion depth was 0.16 mm. From this result, it was found that the coated product was extremely excellent in corrosion resistance.

以上説明したように、本発明のシンク2によれば、シンク2のシンク底面部2aよりも段落ちした排水部13に向け排水が集中する段落部10のみが、耐食性を有する塗膜Tにより被覆されていることで、シンク2が高効率に耐食性を得られるばかりか、キッチンシンク全面に塗膜を被覆する場合に比べ製造コストを抑えることができるため、このシンク2を比較的低価格帯の製品として提供できる。   As described above, according to the sink 2 of the present invention, only the paragraph portion 10 where the drainage concentrates toward the drainage portion 13 that is stepped down from the sink bottom surface portion 2a of the sink 2 is covered with the coating film T having corrosion resistance. As a result, the sink 2 can not only obtain corrosion resistance with high efficiency, but also can be manufactured at a lower cost compared to the case where the entire surface of the kitchen sink is coated with a coating film. Can be provided as a product.

以上、本発明の実施例を図面により説明してきたが、具体的な構成はこれら実施例に限られるものではなく、本発明の要旨を逸脱しない範囲における変更や追加があっても本発明に含まれる。   Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

例えば、前記実施例では、段落部10は、筒部11,11’及び突部12,12’を有しているが、シンクの底面部よりも下方に段落ちし排水部が開口形成したものであれば、例えば段落部は、上下略鉛直方向に延びる直管状の周壁部のみから成ってもよいし、あるいは下方に向け緩やかに縮径する漏斗部のみから成っても構わない。   For example, in the said Example, although the paragraph part 10 has cylinder part 11, 11 'and protrusion 12, 12', it falls below the bottom face part of a sink, and the drainage part opened and formed it In this case, for example, the paragraph portion may be composed of only a straight tubular peripheral wall portion extending in the substantially vertical direction in the vertical direction, or may be composed of only a funnel portion whose diameter is gradually reduced downward.

1 キッチン
2 シンク
2a シンク底面部
3 排水トラップ
4 排水管
10 段落部
11 筒部
12 突部
13 排水部
14 境界部
DESCRIPTION OF SYMBOLS 1 Kitchen 2 Sink 2a Sink bottom face part 3 Drain trap 4 Drain pipe 10 Paragraph part 11 Tube part 12 Protrusion part 13 Drain part 14 Boundary part

Claims (4)

シンク形状に絞り加工されたステンレス鋼材を基材としたキッチンシンクにおいて、シンク底面部には、該シンク底面部よりも段落ちするとともに、排水トラップと水密に係合可能な内径方向に突出する突部を有し、前記突部の内端部が排水部として開口した段落部が前記キッチンシンクと一体に形成されており、
該段落部のみが、耐食性を有する塗膜により被覆されていることを特徴とするキッチンシンク。
In a kitchen sink using a stainless steel material drawn into a sink shape as a base material, the bottom surface of the sink is stepped down from the bottom surface of the sink and protrudes in the inner diameter direction so as to be watertightly engageable with the drain trap. It has a section, paragraph portion inner end has an opening as a drainage portion of the projection is formed integrally with the kitchen sink,
Only the paragraph part is covered with a coating film having corrosion resistance.
前記塗膜は、前記段落部における前記排水部の内周面から前記シンク底面部への境界部まで連続して被覆していることを特徴とする請求項1に記載のキッチンシンク。   2. The kitchen sink according to claim 1, wherein the coating film is continuously covered from an inner peripheral surface of the drainage portion to a boundary portion to the sink bottom surface portion in the paragraph portion. 前記塗膜は、ウレタンエマルジョン樹脂を主剤とする塗料からなり、該塗膜の膜厚が20μm以上であることを特徴とする請求項1または2に記載のキッチンシンク。   The kitchen sink according to claim 1 or 2, wherein the coating film is made of a paint mainly composed of urethane emulsion resin, and the film thickness of the coating film is 20 µm or more. 前記塗膜は、前記主剤に混合されるカップリング剤として、エポキシ基含有シランカップリング剤を有していることを特徴とする請求項3に記載のキッチンシンク。   The kitchen sink according to claim 3, wherein the coating film has an epoxy group-containing silane coupling agent as a coupling agent mixed with the main agent.
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