JP2584109B2 - Paint for water-repellent coating and heat exchanger coated with the paint - Google Patents
Paint for water-repellent coating and heat exchanger coated with the paintInfo
- Publication number
- JP2584109B2 JP2584109B2 JP2152118A JP15211890A JP2584109B2 JP 2584109 B2 JP2584109 B2 JP 2584109B2 JP 2152118 A JP2152118 A JP 2152118A JP 15211890 A JP15211890 A JP 15211890A JP 2584109 B2 JP2584109 B2 JP 2584109B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- paint
- heat exchanger
- fins
- repellent coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Paints Or Removers (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、撥水性を付与する目的で基材表面にコーテ
ィングするための塗料及び、前記塗料を塗布した熱交換
器に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint for coating the surface of a substrate for imparting water repellency, and a heat exchanger to which the paint is applied.
従来の技術 シリコーン系または、フッ素系樹脂化合物は、優れた
撥水性,潤滑性などを有しその特性を活かすためのコー
ティング材料,表面処理剤として多くの分野で、実用化
されている。例えば、空気調和機の熱交換器の表面処理
としても有効である。2. Description of the Related Art Silicone-based or fluorine-based resin compounds have excellent water repellency, lubricity, and the like, and have been put to practical use in many fields as coating materials and surface treatment agents for utilizing their properties. For example, it is also effective as a surface treatment for a heat exchanger of an air conditioner.
そして、空気調和機における空気熱源ヒートポンプ式
空気調和機(以下、単にヒートポンプと呼ぶ)のしめる
割合は急増してきており、家庭用ルームエアコン,業務
用ルームエアコン等については、半数以上を占めてい
る。又、これらヒートピンプに用いられる熱交換器の大
部分は、アルミフィンと、またこれに直行する冷媒管か
ら構成されているフィンチューブ型熱交換器である。ヒ
ートポンプにおいて、冷房時には室内側熱交換器のフィ
ン表面に水分の凝縮が起こり、フィン間における凝縮水
のブリッジ現象により、熱交換器通過風量の低下を招
き、ひいては、冷房能力の低下の原因となる。一方、暖
房時には、室外側熱交換器において、前述した冷房時、
室内側熱交換器と同様な現象が起こる。熱交換器に、着
霜した場合は、通風抵抗が増加し、暖房能力の低下の原
因となり、更に進むと、着霜によるフィンの目詰まりを
生じ、その場合暖房運転を一時停止し、除霜を行なう必
要があるため、暖房の快適性を損なう原因にもなる。し
たがって前記冷房能力,暖房能力の低下を減少させるた
めに及び、暖房時における、室外側熱交換器の着霜を減
少し、除霜回数を減らし,快適性を向上させるために
は、室内機及び室外機の熱交換器のフィン表面の凝縮水
を常に取り除けば、良いわけである。その方法としてフ
ィン表面を撥水化して凝縮水を転がり落とす方法があ
り、実開昭48−11414号公報,実開昭51−15261号公報で
提案されているような4フッ化エチレン樹脂,塩化3フ
ッ化エチレン樹脂などのコーティングが知られている。The proportion of air conditioner heat pump type air conditioners (hereinafter simply referred to as heat pumps) in air conditioners has been increasing rapidly, and more than half of household air conditioners and commercial room air conditioners are occupied. Most of the heat exchangers used in these heat pumps are fin tube type heat exchangers composed of aluminum fins and refrigerant pipes which are perpendicular to the fins. In a heat pump, when cooling, moisture condenses on the fin surfaces of the indoor heat exchanger, and a bridge phenomenon of condensed water between the fins causes a decrease in the air volume passing through the heat exchanger, which in turn causes a decrease in cooling capacity. . On the other hand, at the time of heating, in the outdoor heat exchanger, at the time of cooling described above,
The same phenomenon as the indoor heat exchanger occurs. If frost is formed on the heat exchanger, ventilation resistance increases, causing a decrease in the heating capacity.If the fin is further advanced, clogging of the fins due to frost occurs, in which case the heating operation is temporarily stopped and defrosting is performed. It is necessary to perform heating, which may cause a decrease in heating comfort. Therefore, in order to reduce the decrease in the cooling capacity and the heating capacity and to reduce the frost of the outdoor heat exchanger during heating, to reduce the number of times of defrosting, and to improve the comfort, the indoor unit and the It is good to always remove the condensed water on the fin surface of the heat exchanger of the outdoor unit. As a method therefor, there is a method in which condensed water is rolled off by making the fin surface water-repellent, and a tetrafluoroethylene resin such as the one proposed in Japanese Utility Model Laid-Open Nos. Coatings such as trifluoroethylene resin are known.
発明が解決しようとする課題 前記撥水性に優れた樹脂を塗布したフィン材表面にお
いては、直径2mm以上の比較的大きな凝縮水をフィン表
面から転がり落とすことが可能であり、熱交換器用フィ
ン材として、ある程度の効果が期待できる。しかし、最
近の熱交換器は、高能力化を目的とし、フィン総表面積
を増やすためにフィン間隔が狭くなる傾向にある。現在
の熱交換器のフィン間隔は、約2〜3mmが一般的であり
これからますます狭められていくと考えられる。そこ
で、前記の撥水性に優れた樹脂を塗布する方法では、直
径1mm程度の微細な水滴をフィン表面から落とすことは
できない。そこで、フィン表面に残存した水滴が、フィ
ン間に溜るため、通風抵抗になったり、そのまま氷結し
霜となるなどその撥水効果は不十分であった。したがっ
て、ヒートポンプの冷暖房能力を低下させないようフィ
ン表面の凝縮水を常に取り除くことが可能な高性能な熱
交換器用フィン材が望まれ、より高い撥水性を付与しう
るコーティング材料が必要となる。Problems to be Solved by the Invention On the fin material surface coated with the resin having excellent water repellency, relatively large condensed water having a diameter of 2 mm or more can be rolled off from the fin surface, and as a fin material for a heat exchanger. Some effects can be expected. However, in recent heat exchangers, the fin spacing tends to be narrow in order to increase the capacity and increase the total fin surface area. The fin spacing of current heat exchangers is generally about 2-3 mm and is expected to become increasingly narrower in the future. Therefore, in the method of applying a resin having excellent water repellency, fine water droplets having a diameter of about 1 mm cannot be dropped from the fin surface. Therefore, the water-repellent effect of the water droplets remaining on the fin surface was insufficient, such as a resistance to ventilation or frost as it was, because it remained between the fins. Therefore, a high-performance fin material for a heat exchanger capable of constantly removing condensed water on the fin surface without lowering the cooling / heating capacity of the heat pump is desired, and a coating material capable of imparting higher water repellency is required.
課題を解決するための手段 この目的を達成するために本発明は、下記一般式
(I)の2種を構成単位とした3次元架橋体を有し、 R:メチル基またはフェニル基 (I)式中のR/Si比が、1.0より大きく且つ1.7未満であ
るシリコーン系樹脂化合物を含む溶液と、前記溶液中に
分散され、表面を疎水化処理した無機微粒子とから撥水
性コーティング用塗料を構成し、この塗料を熱交換器の
板状フィンの表面に塗布するのである。Means for Solving the Problems In order to achieve this object, the present invention has a three-dimensional crosslinked body comprising two kinds of the following general formula (I) as constituent units, R: methyl group or phenyl group (I) a solution containing a silicone resin compound in which the R / Si ratio in the formula is greater than 1.0 and less than 1.7, and an inorganic material dispersed in the solution and having a surface subjected to hydrophobic treatment. The water-repellent coating paint is formed from the fine particles, and this paint is applied to the surface of the plate-like fin of the heat exchanger.
作用 上記の構成の撥水性コーティング用塗料を施した基材
表面は、シリコーン系樹脂化合物3次元架橋体の撥水効
果に加え、無機微粒子により形成された表面の微細な凹
凸により、表面と水滴との接触面積が小さくなり、撥水
性がいちじるしく高くなる。Action In addition to the water-repellent effect of the three-dimensionally crosslinked silicone-based resin compound, the surface of the substrate coated with the water-repellent coating paint having the above-described structure has surface and water droplets due to fine irregularities on the surface formed by inorganic fine particles. And the water repellency is extremely high.
実施例 以下本発明の一実施例について説明する。Example An example of the present invention will be described below.
実施例1〜3及び、比較例4,6,7は、3次元架橋体を
構成単位とし基体構成単位中のR/Siを変更した各種シリ
コーン系樹脂を含むコーティング剤に対し、表面を撥水
化処理した無機系粉体あるいは、疎水化処理をしていな
い無機系粉体をシリコーン樹脂コーティング剤中の固形
分に対して、10wt%,あるいは7.5wt%添加して、常温
で撹拌分散し、コーティング塗料を作成し、厚さ0.5mm
のアルミニウム板に浸漬塗布し、150℃の熱風乾燥炉中
で30分間乾燥硬化したものである。また、比較例5は、
3次元架橋体を構成単位としR/Si比が1.6のシリコーン
系樹脂を含むコーティング剤を同様に、厚さ0.5mmのア
ルミニウム板に浸漬塗布し、150℃の熱風乾燥炉中で30
分間乾燥硬化したものである。さらに比較例8は、3次
元架橋体を有さない単量体シリコーン系樹脂を含むコー
ティング剤に対し、表面を疎水化処理した無機系粉体を
シリコーン樹脂コーティング剤中の固形分に対して、10
wt%,あるいは7.5wt%添加して、同様に厚さ0.5mmのア
ルミニウム板に浸漬塗布し、150℃の熱風乾燥炉中で30
分間乾燥硬化したものである。膜強度の評価は、JIS:K
−5400による鉛筆引っ掻き試験を行った。又、撥水性効
果については水に対する接触角を測定することにより評
価した。尚、鉛筆引っ掻き試験とは、塗膜の引っ掻き抵
抗性を鉛筆の芯の硬さを変えた時の塗膜の割れで調べる
ものであり、鉛筆の硬度記号で表わす。又、水に対する
接触角とは、図に示すように、試料2表面に形成した水
滴3と試料2表面が作る角度θで表わされ、接触角θが
大きい程、撥水性が高いといえる。水に対する接触角
は、協和界面科学製コンタクトアングルメータDA−T型
で測定した。In Examples 1 to 3 and Comparative Examples 4, 6, and 7, the surface was water-repellent to a coating agent containing various silicone resins in which the three-dimensionally crosslinked body was a constituent unit and R / Si in the base constituent unit was changed. 10 wt% or 7.5 wt% based on the solid content in the silicone resin coating agent of the inorganic powder subjected to the hydrophobizing treatment or the inorganic powder not subjected to the hydrophobizing treatment, and stirred and dispersed at room temperature. Create coating paint, thickness 0.5mm
Is applied by dip coating on an aluminum plate of No. 1 and dried and cured in a hot air drying oven at 150 ° C. for 30 minutes. Comparative Example 5
Similarly, a coating agent containing a silicone-based resin having an R / Si ratio of 1.6 using a three-dimensional crosslinked product as a structural unit is similarly applied to a 0.5 mm-thick aluminum plate by dip coating, and then dried in a hot-air drying oven at 150 ° C for 30 minutes.
It was dried and cured for minutes. Further, Comparative Example 8 shows that, for a coating agent containing a monomeric silicone resin having no three-dimensional crosslinked body, an inorganic powder whose surface was subjected to a hydrophobic treatment was applied to a solid content in the silicone resin coating agent. Ten
wt% or 7.5wt%, and dip-coated on a 0.5mm thick aluminum plate in the same
It was dried and cured for minutes. Evaluation of film strength is JIS: K
A -5400 pencil scratch test was performed. The water repellency effect was evaluated by measuring the contact angle with water. The pencil scratch test is a test for examining the scratch resistance of a coating film by cracking the coating film when the hardness of the pencil core is changed, and is represented by a pencil hardness symbol. Further, as shown in the figure, the contact angle with water is represented by the angle θ formed between the water droplet 3 formed on the surface of the sample 2 and the surface of the sample 2, and it can be said that the larger the contact angle θ, the higher the water repellency. The contact angle to water was measured with a contact angle meter DA-T manufactured by Kyowa Interface Science.
これらの評価結果を表に示す。表でも判るように、実
施例1〜3は、シリカ微粒子を添加しでいない比較例5
と比較すると、接触角が大幅に向上している。又、比較
例4の表面を疎水化処理していないシリカ微粒子を添加
した場合よりも撥水性が高く、成膜性がよい。更に、R/
Si比が1.7以上であるシリコーン樹脂に無機微粒子を添
加した場合は、比較例6,7からもわかるように撥水性は
実施例1〜3と同様に著しく向上するが塗膜強度が非常
に弱く、実用化には問題がある。比較例8の3次元架橋
体を有さない単量体シリコーン系樹脂化合物をふくむコ
ーティング剤を塗布したサンプリングも、シリカ微粒子
の添加により、実施例1〜3と同様に撥水性向上効果は
認められるも のの、膜強度が著しく弱く、実用化は困難である。すな
わち、本実施例において、大幅に撥水性が向上させるこ
とができると共に、膜強度と成膜性を向上させることが
できた。The results of these evaluations are shown in the table. As can be seen from the table, Examples 1 to 3 were Comparative Examples 5 in which no silica fine particles were added.
Compared with, the contact angle is greatly improved. Further, the water repellency is higher and the film formability is better than when silica fine particles whose surface is not subjected to hydrophobic treatment in Comparative Example 4 are added. Furthermore, R /
When the inorganic particles are added to the silicone resin having a Si ratio of 1.7 or more, the water repellency is significantly improved as in Examples 1 to 3 as can be seen from Comparative Examples 6 and 7, but the coating film strength is very weak. However, there is a problem in practical use. Also in the case of applying a coating agent containing a monomeric silicone resin compound having no three-dimensional crosslinked product of Comparative Example 8, the same effect as in Examples 1 to 3 was observed by adding silica fine particles. Also However, the film strength is extremely weak, and practical application is difficult. That is, in the present example, the water repellency was able to be greatly improved, and the film strength and film formability were able to be improved.
これは、撥水性樹脂に微細な粉体を添加すると、撥水
性樹脂により、表面が撥水性になっていることに加え
て、微小な粉体の微細凹凸により、液滴の接触面積が小
さくなり、液滴とフィン表面の付着力が大幅に低下し、
撥水性が高くなる(モルフォロジカル効果)と考えられ
る。又、表面を疎水化処理した無機微粒子を添加すると
表面処理をしていない微粒子を添加した場合に比べて分
散性が非常によくなり成膜性が向上すると考えられる。
更に、3次元架橋体であるシリコーン系樹脂化合物を用
いると樹脂化合物同志の架橋が進み、3次元網目構造と
なり、優れた強度を有する塗膜となる。一方、3次元架
橋体を有さない単量体シリコーン系樹脂は、構成単位間
の結合が弱く強固な塗膜とはならない。This is because when a fine powder is added to a water-repellent resin, the surface of the water-repellent resin becomes water-repellent, and in addition, the contact area of the droplet becomes smaller due to the fine irregularities of the fine powder. Greatly reduces the adhesion between the droplets and the fin surface,
It is considered that the water repellency becomes higher (morphological effect). It is also considered that the addition of inorganic fine particles whose surface has been hydrophobized results in significantly improved dispersibility and improved film formability as compared with the case where fine particles not subjected to surface treatment are added.
Further, when a silicone-based resin compound that is a three-dimensionally crosslinked body is used, crosslinking between the resinous compounds proceeds, resulting in a three-dimensional network structure, and a coating film having excellent strength. On the other hand, a monomeric silicone resin having no three-dimensional crosslinked product has a weak bond between constituent units and does not form a strong coating film.
発明の効果 以上のように本発明では、撥水性コーティグ用塗料
は、3次元架橋体を構成単位とし、R/Si比が1.0より大
きく且つ1.7未満であるシリコーン系樹脂化合物を含む
溶液と、前記溶液中に分散され、表面が疎水化処理され
た無機系微粒子とから構成されたものであり、この撥水
性コーティグ用塗料を塗布・乾燥硬化することにより成
膜性に優れかつ、非常に高い膜強度と撥水性を示す膜が
得られる。この撥水性コーティング用塗料を熱交換器用
フィン材に塗布し、熱交換器を構成した場合、フィン間
隔が2mm程度と狭い場合でも、フィン表面に凝縮した水
滴を、転がり落とすために有効な性能を有する。したが
って、ヒートポンプエアコンの熱交換器の着霜によるフ
ィン間の目詰まりを遅れさせることにより、ヒートポン
プとして、冷房能力,暖房能力の低下を減少させるとと
もに、暖房時室外機熱交換器の除霜間隔を延長すること
ができ、快適性を向上させることが可能である。Effects of the Invention As described above, in the present invention, a coating material for a water-repellent coating has a three-dimensionally crosslinked body as a constituent unit, and a solution containing a silicone-based resin compound having an R / Si ratio of greater than 1.0 and less than 1.7, It is composed of inorganic fine particles dispersed in a solution and the surface of which has been hydrophobized, and is excellent in film formability and extremely high in film by applying, drying and curing this paint for water repellent coating. A film exhibiting strength and water repellency is obtained. When this water-repellent coating paint is applied to the fin material for heat exchangers and the heat exchanger is configured, even if the fin spacing is as narrow as about 2 mm, effective performance to roll off water droplets condensed on the fin surface Have. Therefore, by delaying the clogging between the fins due to the frost formation of the heat exchanger of the heat pump air conditioner, the heat pump reduces the cooling capacity and the heating capacity and reduces the defrosting interval of the heating outdoor heat exchanger. It can be extended and comfort can be improved.
図は接触角について説明した図である。 1……基材、2……試料、3……水滴、4……接触角。 The figure illustrates the contact angle. 1 ... substrate, 2 ... sample, 3 ... water droplet, 4 ... contact angle.
Claims (3)
3次元架橋体を有し、(I)式中のR/Si比が、1.0より
大きく且つ1.7未満であるシリコーン系樹脂化合物を含
む溶液と無機微粒子とからなる撥水性コーティング用塗
料。 R:メチル基またはフェニル基1. A silicone resin having a three-dimensional crosslinked body comprising two kinds of the following general formula (I) as constituent units, wherein the R / Si ratio in the formula (I) is larger than 1.0 and smaller than 1.7. A water-repellent coating composition comprising a solution containing a compound and inorganic fine particles. R: methyl group or phenyl group
たことを特徴とする請求項1記載の撥水性コーティング
用塗料。2. The water-repellent coating composition according to claim 1, wherein the surface of the inorganic fine particles to be added is subjected to a hydrophobic treatment.
気流が流動する板状フィンと、この板状フィンに直角に
挿通された伝熱管とからなり、前記板状フィンに下記一
般式(I)の2種を構成単位とした3次元架橋体を有
し、(I)式中のR/Si比が、1.0より大きく且つ1.7未満
であるシリコーン系樹脂化合物を含む溶液と無機微粒子
とからなる塗料を塗布した熱交換器。 R:メチル基またはフェニル基3. A plurality of plate-like fins, which are arranged in parallel at regular intervals and through which an air current flows, and a heat transfer tube inserted at right angles to the plate-like fins, wherein the plate-like fins have the following general formula ( A solution containing a silicone-based resin compound having a three-dimensional crosslinked body having two types of constituent units (I) and wherein the R / Si ratio in the formula (I) is greater than 1.0 and less than 1.7; Heat exchanger coated with paint. R: methyl group or phenyl group
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2152118A JP2584109B2 (en) | 1990-06-11 | 1990-06-11 | Paint for water-repellent coating and heat exchanger coated with the paint |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2152118A JP2584109B2 (en) | 1990-06-11 | 1990-06-11 | Paint for water-repellent coating and heat exchanger coated with the paint |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0445181A JPH0445181A (en) | 1992-02-14 |
JP2584109B2 true JP2584109B2 (en) | 1997-02-19 |
Family
ID=15533456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2152118A Expired - Lifetime JP2584109B2 (en) | 1990-06-11 | 1990-06-11 | Paint for water-repellent coating and heat exchanger coated with the paint |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2584109B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101230504B1 (en) * | 2010-08-31 | 2013-02-06 | 한국생산기술연구원 | Metal-Polymer Complex Cold Storage Module |
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---|---|---|---|---|
JP2000026727A (en) * | 1998-07-06 | 2000-01-25 | Dow Corning Toray Silicone Co Ltd | Curable silicone resin composition |
JP2001207123A (en) * | 1999-11-16 | 2001-07-31 | Sentan Kagaku Gijutsu Incubation Center:Kk | Film having high hardness and high droplet slidability and method for producing the same |
JP5466356B2 (en) * | 2006-09-19 | 2014-04-09 | 学校法人慶應義塾 | High water-repellent composition |
JP5135546B2 (en) * | 2008-04-24 | 2013-02-06 | 新日鐵住金株式会社 | Surface-treated metal, method for producing the same, and metal surface-treated liquid |
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DE2435860B2 (en) * | 1974-07-25 | 1977-10-20 | Deutsche Gold- U. Silber-Scheideanstalt, Vorm. Roessler, 6000 Frankfurt | PROCESS FOR THE PRODUCTION OF FINE PARTICLE HYDROPHOBIC SILICACIDS OR SILICATES |
JPS5334831A (en) * | 1976-09-14 | 1978-03-31 | Tokuyama Soda Co Ltd | Coating composition |
JPS58145614A (en) * | 1982-02-23 | 1983-08-30 | Shokubai Kasei Kogyo Kk | Powdery silica dispersible uniformly into organic solvent and its preparation |
JPS59170160A (en) * | 1983-03-18 | 1984-09-26 | Kansai Paint Co Ltd | Coating compound composition for preventing traces of patch of paper |
JPS63184385U (en) * | 1987-05-15 | 1988-11-28 | ||
JPH0737107B2 (en) * | 1988-05-06 | 1995-04-26 | 日新製鋼株式会社 | Black silicone resin coated metal plate |
-
1990
- 1990-06-11 JP JP2152118A patent/JP2584109B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101230504B1 (en) * | 2010-08-31 | 2013-02-06 | 한국생산기술연구원 | Metal-Polymer Complex Cold Storage Module |
Also Published As
Publication number | Publication date |
---|---|
JPH0445181A (en) | 1992-02-14 |
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