JPH0677715B2 - Resin coating method - Google Patents
Resin coating methodInfo
- Publication number
- JPH0677715B2 JPH0677715B2 JP62022563A JP2256387A JPH0677715B2 JP H0677715 B2 JPH0677715 B2 JP H0677715B2 JP 62022563 A JP62022563 A JP 62022563A JP 2256387 A JP2256387 A JP 2256387A JP H0677715 B2 JPH0677715 B2 JP H0677715B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- coated
- powder
- film
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は樹脂のコーテイング方法に関し、更に詳しくは
煙道、煙突、電気集塵器、化学プラントなどの防食被膜
形成、船舶、海洋構造物、配管、工作機械摺動部、無潤
滑軸受、電子部品、アイロン、フライパンなどの耐食耐
摩耗性、低付着性被膜形成に適用しうる樹脂のコーテイ
ング方法に関する。TECHNICAL FIELD The present invention relates to a resin coating method, more specifically, a flue, a chimney, an electrostatic precipitator, a chemical plant or the like, which forms an anticorrosive film, a ship, a marine structure, The present invention relates to a resin coating method applicable to the formation of coatings for corrosion resistance and abrasion resistance and low adhesion such as piping, machine tool sliding parts, non-lubricated bearings, electronic parts, irons and frying pans.
加熱すれば融解する樹脂には、ポリエチレン、ポリプロ
ピレン等のオレフイン系樹脂、ポリアミド系樹脂、ポリ
イミド、アミド系樹脂、フツ素系樹脂等の熱可塑性樹脂
及び半硬化状態で粉砕されたエポキシ樹脂等がよく知ら
れている。Resins that melt when heated are often olefin resins such as polyethylene and polypropylene, polyamide resins, polyimide, amide resins, thermoplastic resins such as fluorine resins, and epoxy resins that are crushed in a semi-cured state. Are known.
これらの樹脂を用いるコーテイング方法としては次の如
き方法が従来から適用されている。As a coating method using these resins, the following methods have been conventionally applied.
（１）流動浸漬方法 加熱した物体を樹脂の粉体が流動する槽（流動槽）の中
に浸漬する方法であり、加熱物体に粉体が付着すると、
物体の熱をうばつて粉体が溶融して樹脂の被膜を形成す
る。(1) Fluid immersion method This is a method in which a heated object is immersed in a tank (fluid tank) in which resin powder flows, and when the powder adheres to the heated object,
The powder is melted by radiating the heat of the object to form a resin film.
この方法はポリエチレン、ポリアミド、エポキシ樹脂、
フツ化ビニリデン樹脂等の比較的低温で融解するような
樹脂に適用されている方法であるが、流動槽の大きさ又
は被塗物の浸漬用設備の大きさによつて、コーテイング
しやすい被塗物の大きさに限度があるため、大型製品に
応用された事例は見当らない。This method uses polyethylene, polyamide, epoxy resin,
This method is applied to resins that melt at relatively low temperatures, such as vinylidene fluoride resin, but it is easy to coat depending on the size of the fluid tank or the equipment for dipping the material to be coated. Since there is a limit to the size of the product, there are no cases where it has been applied to large products.
（２）静電流動浸漬法 樹脂粉体を流動槽内で流動させながら静電気を帯電さ
せ、アースされた被塗物の表面に樹脂粉体の層を形成さ
せたのち、電気炉で焼成して被膜を形成する方法であ
る。(2) Electrostatic fluid immersion method The resin powder is charged in the fluidized tank in a fluidized tank to be charged with static electricity to form a layer of the resin powder on the surface of the grounded object, and then fired in an electric furnace. It is a method of forming a film.
この方法も前記流動浸漬法と同様に大型製品には適用し
難いばかりでなく、焼成する場合、ポリエチレン、ポリ
アミド、エポキシ樹脂のように比較的融解温度が低く、
融解潜熱の小さい樹脂では短時間に僅かな熱量で被膜を
形成することが可能であるが、フツ素系樹脂のように融
解温度が高く、融解潜熱の大きい場合には非常に大きな
熱量を要するばかりでなく、融解物の溶融粘度が高いた
めに、融解温度に近い温度の炉では連続したピンホール
のない被膜を形成するのが難かしい。又、溶融粘度が10
4〜105ポアズになるような高温で加熱すると、加熱炉の
熱により極く表層の樹脂が先ず溶融して、被膜を形成す
るため、常温（又は被塗物を予備加熱する場合もある）
で付着させた粉体の粒子間に存在するガス（空気）が放
散しがたく、コーテイング膜には空気の泡を含んだ状態
になり、ピンホールのない良好なコーテイング膜は得ら
れない。This method is not only difficult to apply to large-sized products like the fluidized-bed method, but when it is baked, it has a relatively low melting temperature like polyethylene, polyamide, and epoxy resin,
It is possible to form a film with a small amount of heat in a short time with a resin with a low latent heat of fusion, but as with a fluorine-based resin, the melting temperature is high, and if the latent heat of fusion is high, a very large amount of heat is required. Moreover, because of the high melt viscosity of the melt, it is difficult to form a continuous pinhole-free coating in a furnace at a temperature close to the melting temperature. Also, the melt viscosity is 10
When heated at a temperature as high as 4 to 10 5 poise, the resin in the outermost layer is first melted by the heat of the heating furnace to form a film, so at room temperature (or the object to be coated may be preheated).
The gas (air) existing between the particles of the powder adhered in step 3 is hard to dissipate, and the coating film contains air bubbles, and a good coating film without pinholes cannot be obtained.
従つて、フツ素樹脂の粉体を付着させた物の焼成は溶融
粘度の低下による被膜の形成速度を犠牲にしてでも良好
な被膜を形成させるために、融解温度よりも僅かに高い
温度で長時間をかけているのが現状である。例えば、フ
ツ素系樹脂では数時間かけて焼成している。Therefore, the baking of the product to which the fluorine resin powder is adhered is performed at a temperature slightly higher than the melting temperature in order to form a good film even at the sacrifice of the film formation rate due to the decrease in melt viscosity. The current situation is that it takes time. For example, a fluorocarbon resin is baked for several hours.
（３）静電吹き付け法 この方法は前記静電流動浸漬法とほぼ同じ工程でコーテ
イング膜を形成する方法であり別名、静電粉体塗装法と
呼ばれる方法である。樹脂の粉体を空気で分散、圧送し
て、粉体を被塗物に吹き付ける際に粉体に静電気を帯電
させ、アースした被塗物の表面に付着させたのち、加熱
炉で、付着した粉体を被塗物にやきつける方法である。
この方法は前記静電流動浸漬法に比べて、静電塗装ガン
の移動により、大型のものにも粉体を付着させることは
できるが、焼成は炉で加熱焼成するので、焼成に要する
設備、費用、時間は静電浸漬法と何ら変らない。(3) Electrostatic spraying method This method is a method of forming a coating film in almost the same steps as the electrostatic flow dipping method, which is also called an electrostatic powder coating method. Resin powder is dispersed by air and pressure-fed, and when the powder is sprayed onto the object to be coated, the powder is charged with static electricity and adhered to the grounded surface of the object to be coated, and then adhered in a heating furnace. This is a method of binding the powder to the object to be coated.
Compared with the electrostatic fluidized dipping method, this method allows the powder to be attached to a large one by moving the electrostatic coating gun, but since firing is performed by heating in a furnace, the equipment required for firing, The cost and time are no different from the electrostatic immersion method.
（４）デイスパージヨン溶液吹き付け後焼成する方法 樹脂粉体を有機溶剤又は水中に懸濁させたものをエアス
プレ又はエアレススプレガンにより被塗物に吹き付け脱
溶剤（脱水）したのち、炉で焼成する方法である。但
し、脱溶剤（脱水）後の粉体の脱落を防止するため、工
業的に用いられているデイスパージヨン溶液にはエポキ
シ樹脂、アルキッド樹脂、アクリル樹脂等、通状塗料に
用いられる樹脂が若干混合されたものが多い。したがつ
て、フツ素系樹脂デイスパージヨンを焼付ける場合には
先ず、脱溶剤したのち、混合したフツ素樹脂以外の樹脂
をゆつくりと熱分解して放出する工程と、その後、フツ
素樹脂を溶融してフツ素樹脂のみの被膜を形成させる工
程の２段階焼成が用いられている。(4) Method of firing after spraying sprayed solution The resin powder suspended in an organic solvent or water is sprayed on an object to be coated with an air spray or airless spray gun to remove the solvent (dehydrate), and then fired in a furnace. Is the way. However, in order to prevent the powder from falling off after solvent removal (dehydration), some industrially used dispersion solutions include epoxy resins, alkyd resins, acrylic resins, etc. Many are mixed. Therefore, when baking the fluorocarbon resin display purgeon, first, the solvent is removed, and then the resin other than the mixed fluorocarbon resin is slowly and thermally decomposed and released, and then the fluorocarbon resin is discharged. The two-step firing of the step of melting the resin to form a film of fluorine resin only is used.
この方法は被塗物に樹脂粉体を付着させるまでは前記、
他の方法に比べて容易に行うことができるが、焼成に長
時間を要し２段階焼成となるため、焼成温度の管理と次
段階焼成工程に移るタイミングが非常に難かしく、バイ
ンダとして用いた樹脂が完全分解していない場合にはコ
ーテイング膜に気泡が残るばかりでなく、付着力も非常
に悪くなるなどの欠点がある。This method is the same as above until the resin powder is attached to the object to be coated,
Although it can be performed more easily than other methods, since it takes a long time to fire and two-step firing is required, it is very difficult to control the firing temperature and move to the next-stage firing step, and thus used as a binder. If the resin is not completely decomposed, not only bubbles remain in the coating film, but also the adhesiveness becomes very poor.
（５）溶射法 この方法は金属、セラミツクの溶射と同様、ホツパに保
持された樹脂の粉末を、酸素アセチレンあるいは酸素プ
ロパンガスによる高温炎が維持されているノズル内に高
流速（例えば50m/sec）で吹き込み、融解軟化した状態
で被塗物表面に衝突付着させ、瞬時に融解過程を経たコ
ーテイング膜を形成させる方法である。(5) Thermal spraying method In this method, similar to the thermal spraying of metal and ceramics, the resin powder held in the hopper is injected at a high flow rate (for example, 50 m / sec into the nozzle where the high temperature flame of oxygen acetylene or oxygen propane gas is maintained ), And melted and softened so as to collide with and adhere to the surface of the object to be coated, and a coating film that has undergone the melting process instantaneously is formed.
この方法では高流速で吹き付けるために被塗物に付着し
た樹脂が加熱しすぎて、溶融粘度が低下し、風圧によ
り、波立ち現象をひきおこし、均一な厚膜が得られ難い
ばかりでなく、熱分解温度の低い樹脂では溶射ガンの移
動速度が遅くなつた場合、コーテイング膜が熱分解して
しまうなどの欠点がある。又、直角に近い状態で吹き付
けた面しか膜を形成し難く複雑な形状のものには施工が
難かしい。In this method, since the resin adhered to the object to be coated is heated too much because it is sprayed at a high flow rate, the melt viscosity is reduced, and the wind pressure causes a wavy phenomenon, making it difficult to obtain a uniform thick film and causing thermal decomposition. If the temperature of the resin is low, the coating film may be thermally decomposed when the moving speed of the spray gun becomes slow. In addition, it is difficult to apply a film having a complicated shape because it is difficult to form a film only on the surface sprayed in a nearly right angle state.
以上述べたように、加熱すれば融解する樹脂を用いて、
コーテイング膜を形成する方法は、耐食性、耐摩耗性、
低摩擦抵抗性、低付着性などの良好な性能を得るための
焼成膜の形成において多大の熱と時間を要し、又、設備
の面でも多大の費用を要し、経済的に大型の製品に適用
できない状況にある。As mentioned above, using a resin that melts when heated,
The method of forming the coating film is corrosion resistance, wear resistance,
A large amount of heat and time are required to form a fired film to obtain good performance such as low friction resistance and low adhesion, and also large costs are required in terms of equipment, making it an economically large product. Is not applicable to.
本発明は上述したような欠点を解消し、小物量産品から
大型の個別品にわたるあらゆる製品に加熱すれば融解す
る樹脂のコーテイング膜を瞬時に且つ安価に形成させう
るコーテイング法を提供しようとするものである。The present invention aims to solve the above-mentioned drawbacks and to provide a coating method capable of instantaneously and inexpensively forming a coating film of a resin which is melted by heating any product from small mass-produced products to large individual products. Is.
本発明は加熱すれば融解する樹脂を用いて、熱融解した
均一なコーテイング膜を形成させる方法において、粉
体状樹脂を加熱融解し液滴状樹脂にする工程、液滴状
樹脂を帯電させる工程、帯電した液滴状樹脂を被コー
テイング材表面に静電付着させコーテイング被膜を形成
する工程からなる工程によつてコーテイング膜を形成さ
せる方法である。The present invention relates to a method of forming a heat-melted and uniform coating film using a resin that melts when heated, a step of heating and melting a powdery resin into a droplet resin, and a step of charging the droplet resin. A method of forming a coating film by a step of electrostatically adhering a charged droplet resin to the surface of a material to be coated to form a coating film.
本発明方法は固体の粉体状樹脂を被コーテイング材に付
着させたのち焼成する方法ではなく、粉体状樹脂が被コ
ーテイング材に到達する前に融解させ、その液滴を静電
気帯電させたのち被コーテイング材に吹き付けて静電付
着させコーテイングする方法であり、被コーテイング面
で液滴状樹脂同志が互に凝結し、液膜状樹脂となつた後
に熱融解温度以下に冷却するだけで、樹脂の融解工程を
経たコーテイング膜が形成される。The method of the present invention is not a method in which a solid powdery resin is adhered to a material to be coated and then baked, but the powdery resin is melted before reaching the material to be coated, and its droplets are electrostatically charged. This is a method in which the material to be coated is sprayed and electrostatically adhered to the material to be coated, and the resin droplets are coagulated with each other on the surface to be coated. A coating film is formed through the melting step of.
以下、本発明によるコーテイング法の一実施態様を第１
図によつて説明する。The first embodiment of the coating method according to the present invention will be described below.
It will be described with reference to the drawings.
ホツパ２に保持されている粉体状樹脂１（例えばテトラ
フルオロエチレンパーフルオロアルキルエーテル共重合
体など）は粉体供給装置３から供給ガス14（特に空気、
窒素など）によつて樹脂輸送ライン７から樹脂加熱装置
８に供給される。このとき供給される粉状樹脂１の平均
粒径は10〜100μｍ程度、望ましくは約30μｍである。The powdery resin 1 (for example, tetrafluoroethylene perfluoroalkyl ether copolymer) held in the hopper 2 is supplied from the powder supply device 3 to a supply gas 14 (especially air,
It is supplied from the resin transportation line 7 to the resin heating device 8 by means of nitrogen or the like. The powder resin 1 supplied at this time has an average particle size of about 10 to 100 μm, preferably about 30 μm.
樹脂加熱装置８に供給された粉体状樹脂１は熱を加えら
れ融点温度以上（350℃〜500℃）に昇温し液滴状樹脂12
となる。液滴状樹脂12は樹脂輸送ライン７より噴射ノズ
ル６に供給され帯電電極５（４は帯電装置、13は導電
線）によつて正あるいは負の静電荷を帯びながら、アー
ス10されている被コーテイング材９に静電付着し、コー
テイング膜11が形成される。このとき静電付着が行われ
やすいように、帯電電極５の電圧は80kV以下が望まし
く、液滴状樹脂12の流出速度は10m/sec以下特に2m/sec
程度が良好であることを実験結果で確認している。The powdery resin 1 supplied to the resin heating device 8 is heated and heated to a temperature higher than the melting point temperature (350 ° C. to 500 ° C.), and the droplet resin 12
Becomes The liquid droplet resin 12 is supplied to the injection nozzle 6 from the resin transport line 7 and is charged to the earth 10 while being charged with positive or negative electrostatic charge by the charging electrode 5 (4 is a charging device, 13 is a conductive wire). A coating film 11 is formed by electrostatically adhering to the coating material 9. At this time, the voltage of the charging electrode 5 is preferably 80 kV or less, and the outflow speed of the droplet-shaped resin 12 is 10 m / sec or less, especially 2 m / sec so that electrostatic adhesion is easily performed.
The experimental results confirm that the degree is good.
以上の工程で液滴状樹脂を被コーテイング材表面すべて
にわたつて付着させることによつて被コーテイング材表
面に樹脂膜を作成することができる。A resin film can be formed on the surface of the material to be coated by depositing the droplet-shaped resin over the entire surface of the material to be coated in the above steps.
本発明の方法によると融解した樹脂の液滴に静電気を帯
電させるために、従来の溶射法のように圧送ガス流速を
高くすることなく吹き付けられるので、均一なコーテイ
ング膜を容易に得られるばかりでなく、原料樹脂の塗着
効率を大幅に向上することができる。又、本発明は従来
の方法では不可能であつた大型で複雑な被塗物のコーテ
イングも可能である。According to the method of the present invention, since the molten resin droplets are charged with static electricity, they can be sprayed without increasing the pressure-feeding gas flow rate unlike the conventional thermal spraying method, so that a uniform coating film can be easily obtained. Therefore, the coating efficiency of the raw material resin can be significantly improved. Further, the present invention can coat a large and complicated object to be coated, which is impossible by the conventional method.
第１図は本発明によるコーテイング法の一実施態様を説
明するための図である。FIG. 1 is a diagram for explaining one embodiment of a coating method according to the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平井 悦郎 広島県広島市西区観音新町４丁目６番22号 三菱重工業株式会社広島研究所内 (56)参考文献 特開 昭57−127464（ＪＰ，Ａ) 特開 昭53−88046（ＪＰ，Ａ) 特開 昭51−109939（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Etsuro Hirai 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory (56) Reference JP-A-57-127464 (JP, A) JP-A-53-88046 (JP, A) JP-A-51-109939 (JP, A)
Claims (1)
イングする方法において、粉体状樹脂を加熱融解し液
滴状樹脂にする工程、液滴状樹脂を帯電させる工程、
帯電した液滴状樹脂を被コーテイング材表面に静電付
着させコーテイング被膜を形成する工程からなることを
特徴とする樹脂のコーテイング方法。1. A method for coating a surface of a material to be coated with a molten resin, the step of heating and melting a powdery resin to form a droplet resin, the step of charging the droplet resin,
A method for coating a resin, comprising a step of electrostatically adhering a charged droplet resin to the surface of a material to be coated to form a coating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62022563A JPH0677715B2 (en) | 1987-02-04 | 1987-02-04 | Resin coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62022563A JPH0677715B2 (en) | 1987-02-04 | 1987-02-04 | Resin coating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63194771A JPS63194771A (en) | 1988-08-11 |
| JPH0677715B2 true JPH0677715B2 (en) | 1994-10-05 |
Family
ID=12086338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62022563A Expired - Lifetime JPH0677715B2 (en) | 1987-02-04 | 1987-02-04 | Resin coating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0677715B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6805952B2 (en) * | 2000-12-29 | 2004-10-19 | Lam Research Corporation | Low contamination plasma chamber components and methods for making the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51109939A (en) * | 1975-03-23 | 1976-09-29 | Yasuyuki Sakurada | BUTSUSHITSUOKANETSUYOKAISHITE TO SOSURUHOHO TO KYUJOBIFUNMATSUNOSEIHO TO SONOSOCHINITSUITE |
| JPS5388046A (en) * | 1977-01-14 | 1978-08-03 | Toyota Motor Corp | Electrostatic powder coating method and spray coating gun |
| US4346667A (en) * | 1980-12-19 | 1982-08-31 | The Continental Group, Inc. | Inside powder striping apparatus |
-
1987
- 1987-02-04 JP JP62022563A patent/JPH0677715B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63194771A (en) | 1988-08-11 |
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