JPH03251693A - Composition for water repellent coating and heat exchanger employing composition for water repellent coating - Google Patents
Composition for water repellent coating and heat exchanger employing composition for water repellent coatingInfo
- Publication number
- JPH03251693A JPH03251693A JP4763190A JP4763190A JPH03251693A JP H03251693 A JPH03251693 A JP H03251693A JP 4763190 A JP4763190 A JP 4763190A JP 4763190 A JP4763190 A JP 4763190A JP H03251693 A JPH03251693 A JP H03251693A
- Authority
- JP
- Japan
- Prior art keywords
- water
- heat exchanger
- composition
- repellent coating
- water repellent
- 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.)
- Pending
Links
- 239000005871 repellent Substances 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 33
- 239000011248 coating agent Substances 0.000 title abstract description 13
- 238000000576 coating method Methods 0.000 title abstract description 11
- 239000000203 mixture Substances 0.000 title abstract description 8
- 230000002940 repellent Effects 0.000 title abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 12
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 9
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 8
- 239000011737 fluorine Substances 0.000 claims abstract description 8
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 6
- 239000008199 coating composition Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 230000003111 delayed effect Effects 0.000 abstract 1
- 230000006866 deterioration Effects 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 229920002050 silicone resin Polymers 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000003618 dip coating Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
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
ングするための組成物及び、前記組成物を塗布した熱交
換器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composition for coating the surface of a substrate for the purpose of imparting water repellency, and a heat exchanger coated with the composition.
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０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。Background Art Silicone-based or fluorine-based resin compounds have excellent water repellency, lubricity, etc., and have been put to practical use in many fields as coating materials and surface treatment agents to take advantage of these properties. It is also effective as a surface treatment for heat exchangers in air conditioners.
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。The proportion of air-source heat pump type air conditioners (hereinafter simply referred to as heat pumps) among air conditioners is rapidly increasing, and they now account for more than half of household room air conditioners, commercial room air conditioners, etc.
又、これらヒートポ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、前述した冷肩時、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、暖屑時における、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フツ化エチレン樹脂、塩
化３フツ化エチレン樹脂などのコーティングが知られて
いる。Furthermore, most of the heat exchangers used in these heat pumps are fin-tube heat exchangers that are composed of aluminum fins and refrigerant pipes that run perpendicularly to the aluminum fins. In a heat pump, during cooling, moisture condenses on the fin surface of the indoor heat exchanger, and the bridging phenomenon of condensed water between the fins causes a decrease in the air flow passing through the heat exchanger, which in turn causes a decrease in cooling capacity. . On the other hand, during heating, the same phenomenon occurs in the outdoor heat exchanger as in the indoor heat exchanger during the cold shoulder described above. If frost forms on the heat exchanger, ventilation resistance will increase, causing a reduction in heating capacity, and if the heat exchanger continues to grow, the fins will become clogged due to frost formation.
In this case, it is necessary to temporarily stop the heating operation and defrost the air, which may impair the comfort of heating. Therefore, in order to reduce the decrease in the cooling capacity and heating capacity, and to reduce frost formation on the outdoor heat exchanger during heating waste,
In order to reduce the number of times of defrosting and improve comfort, it is better to constantly remove condensed water from the fin surfaces of the heat exchangers of the indoor and outdoor units. One way to do this is to make the fin surface water repellent and roll off the condensed water. 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ｆ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。Problems to be Solved by the Invention On the surface of the fin material coated with the resin with excellent water repellency, it is possible to roll off relatively large condensed water with a diameter of 2 mm or more from the fin surface, and it can be used as a fin material for heat exchangers. , a certain degree of effect can be expected. However, in recent heat exchangers, the fin spacing tends to become narrower in order to increase the total fin surface area in order to increase the capacity. The fin spacing of current heat exchangers is generally about 2 to 3 mm, and it is thought that it will become narrower in the future.
しかしながら、前記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
を付与しつるコーティング材料が必要となる。However, with the method of applying a resin with excellent water repellency, fine water droplets with a diameter of about 1 mm cannot be dropped from the fin surface. Therefore, the water droplets remaining on the fin surfaces accumulate between the fins, causing ventilation resistance, or freezing and forming frost, resulting in insufficient water repellency. Therefore, a high-performance heat exchanger fin material is desired that can constantly remove condensed water from the fin surface so as not to reduce the heating and cooling capacity of the heat pump, and a coating material that provides higher water repellency is required.
８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の撥水性コーチインク
用組成物は、シリコーン系または、フッ素系樹脂化合物
からなる溶液と、表面を疎水化処理した無機粉体とから
構成してなるものである。Means for Solving the 8 Problems To achieve this object, the water-repellent coach ink composition of the present invention comprises a solution consisting of a silicone-based or fluorine-based resin compound, and an inorganic powder whose surface has been hydrophobized. It is composed of.
また、前記板状フィンの表面にシリコーン系または、フ
ッ素系樹脂化合物からなる溶液と、表面を疎水化処理し
た無機粉体とからなる撥水性コーティング用組成物を設
けてなる撥水性コーチインク３用組成物を塗布した熱交
換器を構成するものである。Further, a water-repellent coach ink 3 is provided in which a water-repellent coating composition comprising a solution of a silicone-based or fluorine-based resin compound and an inorganic powder whose surface has been hydrophobized is provided on the surface of the plate-like fin. This constitutes a heat exchanger coated with the composition.
作用
上記の構成の撥水性コーティング組成物は、無機粉体表
面を疎水化処理しているため、溶液中への分散性がよく
なり、良好な成膜性となり、本組成物を施した基材表面
は、シリコーン系または、フッ素系樹脂の撥水効果に加
え、無機粉体により形成された表面の微細凹凸により、
表面と水滴との接触面積が小さくなり、撥水性が著しく
高くなる。Effect The water-repellent coating composition having the above structure has been subjected to a hydrophobic treatment on the surface of the inorganic powder, so it has good dispersibility in the solution and good film-forming properties, and can be used on substrates coated with this composition. In addition to the water-repellent effect of silicone-based or fluorine-based resin, the surface has fine irregularities formed by inorganic powder.
The contact area between the surface and water droplets becomes smaller, resulting in significantly higher water repellency.
実施例 以下本発明の一実施例について説明する。Example An embodiment of the present invention will be described below.
実施例５．６及び、比較例３．４は、シリコーン系樹脂
コーティング剤に対し、各種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、ｌ Ｑ ｗ ｔ
％、あるいは７，５ｗｔ％添加して、常温で攪拌分散し
、コーティング組成物を作成し、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３
０分間乾燥硬化したものである。また、比較例１は、シ
リコーン系樹脂コーティング剤を同様に、厚さ０．５ｍ
ｍ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。In Example 5.6 and Comparative Example 3.4, various inorganic powders were added to the silicone resin coating agent based on the solid content in the silicone resin coating agent.
% or 7.5 wt%, stirred and dispersed at room temperature to create a coating composition, applied to an aluminum plate with a thickness of 0.5 mm by dip coating, and dried in a hot air drying oven at 150°C for 30 minutes.
It was dried and cured for 0 minutes. In addition, in Comparative Example 1, a silicone resin coating agent was similarly applied to a thickness of 0.5 m.
The coating was applied by dip coating onto an aluminum plate of 1.5 mm, and dried and cured for 30 minutes in a hot air drying oven at 150°C.
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、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。The water repellency effect was evaluated by measuring the contact angle with water. As shown in the figure, the contact angle with respect to water is expressed 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 with respect to water was measured using a contact angle meter DA-T model manufactured by Kyowa Interface Science.
実施例５．６は、無機シリカ微粒子の表面を疎水化処理
したものである。In Examples 5 and 6, the surfaces of inorganic silica fine particles were subjected to hydrophobization treatment.
表；添加粒子の種類と水接触角の関係
性１；部分的に微小クラック発生。分散が悪く、良好な
塗膜形成ができず。Table: Relationship between the type of added particles and the water contact angle 1: Small cracks partially occurred. Poor dispersion and failure to form a good coating film.
また、各サンプルとも、微粒子添加後、総固形分比（（
ベースレジン中の固形分子機粒子）／塗料重量）が２０
％となるよう、キシレンにより希釈した（塗料の増粘を
おざえるため）。In addition, for each sample, after adding fine particles, the total solid content ratio ((
Solid molecular particles in base resin/paint weight) is 20
% (to prevent thickening of the paint).
表からも判るように、
実施例５．６の接触角は、比較例１．２に比べ、大幅に
大きくなっている。比較例３．４の無機シリカ（表面を
疎水化処理していないもの）を添加した塗料の場合、撥
水性向上効果は認められるものの、塗膜にクラックを生
じるなど良好な成膜性であるとは言えず、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
向上していると共に、成膜性が向上し、良好な塗膜を得
ることができる。As can be seen from the table, the contact angle of Example 5.6 is significantly larger than that of Comparative Example 1.2. In the case of the paint containing inorganic silica (the surface of which was not subjected to hydrophobization treatment) in Comparative Example 3.4, although the water repellency improvement effect was observed, the film formation properties were not good, as cracks occurred in the paint film. However, it is difficult to put it into practical use. That is, in this example, water repellency is significantly improved, film formability is improved, and a good coating film can be obtained.
まず、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（モルフオロジカル効果）。また、無機シ
リカの表面を疎水化処理しない場合、すなわち、親水性
に場合は、溶液中で、無機シリカ同志の凝集が生じ、分
散性が悪くなり、良好な成膜性が得られない。無機シリ
カの表面を疎水化処理することにより、分散性がよくな
るので、成膜性がよくなると考えられる。First, when fine powder is added to water-repellent resin, in addition to the water-repellent resin making the surface water-repellent,
The fine irregularities of the fine powder reduce the contact area of the droplets, significantly reducing the adhesion force between the droplets and the fin surface, and increasing water repellency (morphological effect). Furthermore, if the surface of the inorganic silica is not treated to make it hydrophobic, that is, if it is made hydrophilic, the inorganic silica aggregates with each other in the solution, resulting in poor dispersibility and failure to obtain good film-forming properties. Hydrophobic treatment of the surface of inorganic silica improves dispersibility, which is thought to improve film formability.
発明の効果
以上のように本発明では、撥水性コーティング用組成物
を、シリコーン系または、フッ素系樹脂化合物からなる
溶液と、表面を疎水化処理した無機粉体を前記溶液中に
添加し構成したものであり、優れた成膜性を有し、この
撥水性コーティング用組成物を塗布した基材は非常に高
い撥水性を示す。Effects of the Invention As described above, in the present invention, a water-repellent coating composition is constructed by adding a solution of a silicone-based or fluorine-based resin compound and an inorganic powder whose surface has been hydrophobized to the solution. It has excellent film-forming properties, and a substrate coated with this water-repellent coating composition exhibits extremely high water repellency.
また、この撥水性コーティング用組成物を熱交換器用フ
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。In addition, when this water-repellent coating composition is applied to the fin material for a heat exchanger to construct a heat exchanger, it is effective for rolling off water droplets condensed on the fin surface even when the fin spacing is as narrow as about 2 mm. It has excellent performance. Therefore, by delaying clogging between the fins due to frost formation on the heat exchanger of a heat pump air conditioner, the heat pump can reduce the decline in cooling and heating capacity, and also shorten the defrosting interval of the outdoor unit heat exchanger during heating. It can be extended to improve comfort.
図は接触角について説明した断面図である。
１・・・基材、２・・・試料、３・・・水滴、４・・・
接触角。The figure is a cross-sectional view explaining the contact angle. 1...Base material, 2...Sample, 3...Water drop, 4...
contact angle.
Claims (2)
る溶液と、表面を疎水化処理した無機粉体とからなる撥
水性コーティング用組成物。(1) A water-repellent coating composition comprising a solution of a silicone-based or fluorine-based resin compound and an inorganic powder whose surface has been subjected to a hydrophobic treatment.
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、前記板状フィンの表面にシリコ
ーン系または、フッ素系樹脂化合物からなる溶液と、表
面を疎水化処理した無機粉体とからなる撥水性コーティ
ング用組成物を設けてなる撥水性コーティング用組成物
を用いた熱交換器。(2) Consisting of a large number of plate-shaped fins arranged in parallel at regular intervals, through which air flows, and a heat transfer tube inserted at right angles to the plate-shaped fins, the surface of the plate-shaped fins is made of silicone or A heat exchanger using a water-repellent coating composition comprising a solution of a fluororesin compound and an inorganic powder whose surface has been hydrophobized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4763190A JPH03251693A (en) | 1990-02-28 | 1990-02-28 | Composition for water repellent coating and heat exchanger employing composition for water repellent coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4763190A JPH03251693A (en) | 1990-02-28 | 1990-02-28 | Composition for water repellent coating and heat exchanger employing composition for water repellent coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03251693A true JPH03251693A (en) | 1991-11-11 |
Family
ID=12780573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4763190A Pending JPH03251693A (en) | 1990-02-28 | 1990-02-28 | Composition for water repellent coating and heat exchanger employing composition for water repellent coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03251693A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560912U (en) * | 1992-01-29 | 1993-08-10 | 株式会社ゼクセル | Vehicle air conditioning cooling unit |
| EP0649887A3 (en) * | 1993-10-22 | 1996-12-18 | Dow Corning Asia Ltd | Water-repellant and antiseptic coating composition. |
| JP2003128991A (en) * | 2001-10-26 | 2003-05-08 | Nippon Soda Co Ltd | Water-repellent film and method for producing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028285A (en) * | 1988-06-28 | 1990-01-11 | Kansai Paint Co Ltd | Composition capable of forming water repellent coating film |
| JPH03215570A (en) * | 1990-01-19 | 1991-09-20 | Tokyo Silicone Kk | Water-repellent coating material and coating film |
-
1990
- 1990-02-28 JP JP4763190A patent/JPH03251693A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028285A (en) * | 1988-06-28 | 1990-01-11 | Kansai Paint Co Ltd | Composition capable of forming water repellent coating film |
| JPH03215570A (en) * | 1990-01-19 | 1991-09-20 | Tokyo Silicone Kk | Water-repellent coating material and coating film |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0560912U (en) * | 1992-01-29 | 1993-08-10 | 株式会社ゼクセル | Vehicle air conditioning cooling unit |
| EP0649887A3 (en) * | 1993-10-22 | 1996-12-18 | Dow Corning Asia Ltd | Water-repellant and antiseptic coating composition. |
| JP2003128991A (en) * | 2001-10-26 | 2003-05-08 | Nippon Soda Co Ltd | Water-repellent film and method for producing the same |
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