JPH06296926A - Production of coated body with porous base material powder paint - Google Patents
Production of coated body with porous base material powder paintInfo
- Publication number
- JPH06296926A JPH06296926A JP11249593A JP11249593A JPH06296926A JP H06296926 A JPH06296926 A JP H06296926A JP 11249593 A JP11249593 A JP 11249593A JP 11249593 A JP11249593 A JP 11249593A JP H06296926 A JPH06296926 A JP H06296926A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- coating
- coating film
- powder coating
- powder
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば木材のような多
孔質基材の粉体塗料塗装体の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a powder coating material coated on a porous substrate such as wood.
【０００２】[0002]
【従来の技術】粉体塗装は、溶剤型塗料では５〜１５μ
程度の膜厚しか得られないのに比べ、４０〜１５０μも
の厚膜塗装ができるので、木質基材に用いると重量感の
ある高級仕上げができる上に、傷がつきにくい、強靭な
保護膜を形成できる利点があるが、従来は木質基材には
ほとんど用いられておらず、主に金属基材の塗装に用い
られている。従来行われている金属板の粉体塗装は、粉
体塗料の各粒子を帯電させるとともに、金属板をアース
し、静電引力により粉体を金属板に付着させる、いわゆ
る静電塗装を行うものであるが、その塗料は樹脂に必要
に応じて顔料やその他の添加剤を加えて練り合わせてか
ら粉体化したものであるので、塗膜はその融点以上に加
熱して溶融、造膜する必要があり、１４０℃ないし２０
０℃で２０分程度加熱することが行われている。2. Description of the Related Art Powder coating is 5 to 15 .mu.
Compared to obtaining only a film thickness of about 40 to 150 μm, it is possible to apply a thick film of 40 to 150 μm, so when used on a wood base material, a heavy-duty high-quality finish can be achieved, and a tough protective film that is hard to scratch Although it has an advantage that it can be formed, it is rarely used for wood base materials in the past and is mainly used for coating metal base materials. Conventionally, powder coating of a metal plate is a so-called electrostatic coating in which each particle of the powder coating is charged, the metal plate is grounded, and the powder is attached to the metal plate by electrostatic attraction. However, since the paint is made by mixing the resin with pigments and other additives as necessary and kneading it into powder, the coating film must be heated above its melting point to melt and form a film. There is 140 ℃ to 20
Heating is performed at 0 ° C. for about 20 minutes.
【０００３】このような粉体塗装を多孔質基材に行う
と、塗膜を加熱する工程で、多孔質内に含有あるいは吸
着されている水分や空気が膨脹することにより噴出し、
溶融した塗膜に混入して塗膜は発泡し、平滑な塗膜が得
られない。特に透明な塗膜では白濁して美観を損ねると
いう問題がある。When such a powder coating is applied to a porous substrate, in the step of heating the coating film, the water or air contained or adsorbed in the porous material expands to eject.
When mixed with the molten coating, the coating foams and a smooth coating cannot be obtained. In particular, there is a problem that a transparent coating film becomes cloudy and spoils the appearance.
【０００４】これを避けるため、予め多孔質基材の塗布
面を粉体塗膜の融点以上に加熱しておき、その上に粉体
塗料の塗装を行ない、多孔質基材の保有する熱により溶
融・造膜すると、多孔質基材は放冷するに従い水蒸気な
どの気体は放出しないばかりではなく、減圧気味とな
り、得られる塗膜は発泡することがない。しかし、この
方法は、コンクリートや鋳物のように熱容量の大きい材
料では、一旦予熱しておけば粉体塗料は溶融・造膜され
るに足る熱量を供給されるが、木質材料のように熱容量
が小さく、その保持した熱では塗布した粉体塗料を溶融
・造膜することができない材料には適用できない。In order to avoid this, the coated surface of the porous base material is heated in advance to the melting point of the powder coating film or higher, and the powder coating material is applied on it, and the heat stored in the porous base material is used. When the porous base material is melted and formed into a film, the porous base material does not release gas such as water vapor as it is left to cool, but also becomes slightly depressurized, and the obtained coating film does not foam. However, in this method, for a material with a large heat capacity such as concrete or casting, once it is preheated, the powder coating is supplied with a sufficient amount of heat to be melted and formed into a film. It is not applicable to materials that are small and cannot melt and form the applied powder coating material with the held heat.
【０００５】木質基材に粉体塗装を行う方法としては、
基材に粉体塗料を塗布し、加熱した金属板をアイロンの
ように熱圧着する方法も知られているが、これは平坦な
被塗面にしか利用することができず、様々な曲面を持っ
た被塗面にはそれに密着する形状の金属板を作る煩わし
さがあり、実用的ではない。As a method of powder coating a wood base material,
A method is known in which powder coating is applied to a base material and a heated metal plate is thermocompression bonded like an iron, but this method can be used only on a flat coated surface, and various curved surfaces can be used. The surface to be coated has the trouble of making a metal plate having a shape in close contact with it, which is not practical.
【０００６】[0006]
【発明が解決しようとする課題】以上のように、多孔質
基材に粉体塗料の塗装を行う場合には、その塗膜形成過
程において、従来の方法による加熱を行うと多孔質基材
内の水分等が噴出するという問題があり、これを避ける
ために多孔質基材を予熱する方法も行われているが、こ
れも的確、能率的に行えるものではないのみならず、熱
容量の比較的小さい木質基材には適用できないという問
題があり、さらに金属板をアイロンのように用いて木質
基材に適用できる方法も曲面の被塗面には実用的でない
という問題があり、その改善が望まれていた。As described above, when the powder coating material is applied to the porous base material, heating in the conventional method is performed in the process of forming the coating film. However, there is a method of preheating the porous base material in order to avoid this, but this is also not exactly and efficiently performed, and the heat capacity is relatively high. There is a problem that it can not be applied to small wooden bases, and there is also a problem that the method that can be applied to wooden bases by using a metal plate like an iron is not practical for curved coated surfaces, so improvement is desired. It was rare.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記課題を解
決するために、多孔質基材にシーラーを塗布する工程
と、該シーラー塗装体を研磨する工程と、該研磨面に中
塗り塗料を塗布する工程と、該中塗り塗膜の上に粉体塗
料を塗布する工程と、該粉体塗料塗布層をほぼ局限加熱
する赤外線照射工程を有する多孔質基材粉体塗料塗装体
の製造方法を提供するものである。In order to solve the above-mentioned problems, the present invention provides a step of applying a sealer to a porous substrate, a step of polishing the sealer-coated body, and an intermediate coating composition on the polished surface. Of a porous base material powder coating body having a step of applying a powder coating material, a step of applying a powder coating material on the intermediate coating film, and an infrared irradiation step of substantially locally heating the powder coating material coating layer It provides a method.
【０００８】本発明において、多孔質基材とは木質基材
のみならず、コンクリート、鋳物、セラミック製品、紙
製品を含むが、木質基材への利用価値が大きい。木質基
材としては、木材及び木材を加工して得られる合板、ハ
ードボード、パーティクルボードなど木材を使用して得
られるすべての材料が含まれるが、含水率の少ないもの
が好ましい。また、木質の比重が高く、連続した導管の
長さが短い程好ましい。In the present invention, the porous base material includes not only a wood base material but also concrete, castings, ceramic products and paper products, but it has a great utility value as a wood base material. The wood base material includes all materials obtained by using wood such as wood and plywood obtained by processing wood, hardboard, particle board, and the like, and those having a low water content are preferable. Further, it is preferable that the specific gravity of wood is high and the length of the continuous conduit is short.
【０００９】本発明においては、まず目止めをするため
に多孔質基材にシーラーを塗布し、乾燥する。その際ケ
バ立つ（毛皮の毛のように繊維が立つ現象）のでサンド
ペーパー等により研磨する、いわゆる空研ぎを行う。そ
の後、表面を平滑にするために、中塗り塗料を塗布し、
乾燥する。木質基材用のシーラー及び中塗り塗料として
は、木工塗料で使用されるラッカータイプ、アミノアル
キッドクリヤー系、ウレタン系、あるいはポリエステル
系などが使用できるが、低温硬化、作業の能率等のため
には紫外線硬化型塗料や電子線硬化型塗料が好ましい。In the present invention, first, a sealer is applied to the porous base material for sealing and then dried. At that time, since fluffing occurs (a phenomenon in which fibers rise like fur hair), so-called sanding is performed by sanding with sandpaper or the like. After that, in order to smooth the surface, apply an intermediate coating paint,
dry. As the sealer and intermediate coating for wood base materials, lacquer type, amino alkyd clear type, urethane type or polyester type used in woodworking coating can be used, but for low temperature curing, work efficiency, etc. UV curable paints and electron beam curable paints are preferred.
【００１０】紫外線硬化型塗料としては、ポリエステル
系、ウレタン系、エポキシ系、ポリエーテル系、アクリ
ル系などのオリゴマー、モノビニル系、ジビニル系、ト
リビニル系、テトラビニル系などの反応性希釈剤とアセ
トフェノン系、ベンゾインエーテル系、ベンジルケター
ル系、ケトン系などの光重合開始剤を配合して得られる
ものが挙げられるが、その塗膜は粉体塗料塗膜形成時の
加熱に耐えるもの、その加熱時に塗膜から溶剤、モノマ
ーなどの揮発分を放出しないものほど好ましい。The UV-curable coating composition includes polyester-based, urethane-based, epoxy-based, polyether-based, acrylic-based oligomers, monovinyl-based, divinyl-based, trivinyl-based, tetravinyl-based reactive diluents and acetophenone-based coatings. , Benzoin ether-based, benzyl ketal-based, and ketone-based photopolymerization initiators can be used.The coating film must be resistant to heat during powder coating film formation. Those that do not release volatile components such as solvents and monomers from the membrane are more preferable.
【００１１】本発明において使用される粉体塗料は、熱
可塑性粉体塗料、熱硬化性粉体塗料のいずれも使用でき
る。粉体塗料は樹脂及び必要に応じて可塑剤、着色剤
（染料や顔料を含む）、流展剤、黄変防止剤等の添加剤
からなる組成物を練り合わせ、粉体化したものである。
木質基材用としてはこれらから顔料を除いた無色透明な
クリヤー又は染料を加えた着色クリヤー塗料を使用する
と生地の模様を活かした仕上げをすることができる。樹
脂成分としては熱可塑性樹脂として、ポリオレフィン樹
脂系、ポリ塩化ビニル樹脂系、ポリアミド系、ポリエス
テル系などを使用することができる。また、熱硬化性樹
脂系ではエポキシ樹脂系、ポリエステル樹脂系、ハイブ
リッド系、アクリル系などを使用することができる。こ
れらの樹脂のうち、熱可塑性樹脂の溶融は一般に２００
℃以上の加熱を必要とするので、木質基材に粉体塗料の
塗膜を形成するときに木質基材内の水分等により発泡し
易いので、より低温で溶融し、造膜する熱硬化性樹脂を
使用した粉体塗料が好ましい。The powder coating used in the present invention may be either a thermoplastic powder coating or a thermosetting powder coating. The powder coating material is obtained by kneading a resin and, if necessary, a composition comprising an additive such as a plasticizer, a colorant (including a dye or a pigment), a leveling agent, an anti-yellowing agent and the like into a powder.
For a wood base material, a colorless and clear clear paint obtained by removing pigments from these or a colored clear paint containing a dye is used, whereby a finish utilizing the pattern of the cloth can be achieved. As the resin component, a thermoplastic resin such as a polyolefin resin type, a polyvinyl chloride resin type, a polyamide type, or a polyester type can be used. As the thermosetting resin system, epoxy resin system, polyester resin system, hybrid system, acrylic system and the like can be used. Of these resins, the melting of thermoplastic resins is generally 200
Since it requires heating above ℃, it easily foams due to moisture in the wood base material when forming the coating film of the powder coating on the wood base material. A powder coating using a resin is preferable.
【００１２】本発明においては、粉体塗料の塗布層をほ
ぼ局限加熱するために熱線照射を行うが、そのためには
照射強度、照射距離、照射時間をコントロールする必要
があり、多孔質基材内の水分等が放出されないような温
度にするとともに、その温度で溶融・造膜する粉体塗料
を選択する。熱線としては赤外線が好ましいが、これに
は近赤外線、遠赤外線も含まれる。赤外線照射装置とし
ては、セラミック等からなる赤外線放射体が使用され、
その波長は特に限定されないが、使用する粉体塗料の吸
収波長とできるかぎり近似した波長を放射する放射体が
好ましい。In the present invention, heat ray irradiation is performed in order to substantially locally heat the coating layer of the powder coating material. For that purpose, it is necessary to control the irradiation intensity, irradiation distance, and irradiation time. Select a powder coating that will melt and form a film at a temperature that does not release the water and other substances. Infrared rays are preferable as the heat rays, but this includes near infrared rays and far infrared rays. As the infrared irradiation device, an infrared radiator made of ceramic or the like is used,
The wavelength is not particularly limited, but a radiator that emits a wavelength as close as possible to the absorption wavelength of the powder coating used is preferable.
【００１３】[0013]
【実施例】次に実施例を説明するが、本発明はこれに限
定されるものではない。 実施例１ 木質基材として、ゴムと米ツガ集成材からなる２２０×
２３０×２５ｍｍ、含水率１０％の平板試験片に、水性
紫外線硬化型塗料（玄々化学社製、商品名ウルトラＶカ
ラー）を塗布量３０ｇ／ｍ2 で塗布し、８０Ｗ／ｃｍ2
の紫外線照射ランプから、照射距離１５０ｍｍ、照射時
間２０秒の条件で紫外線を照射し、塗膜を硬化させる。
次に＃１８０のサンドペーパーで塗膜表面を研磨する。
その後、この研磨した塗布面に再度上記水性紫外線硬化
型塗料からなる塗布膜を同じ塗布量、同じ照射条件で設
ける。このようにしてシーラー塗布膜及びその研磨面に
設けた中塗り塗膜からなる下地が形成される。EXAMPLES Examples will be described below, but the present invention is not limited thereto. Example 1 220 × composed of rubber and rice hemlock laminated wood as a wood base material
A flat plate test piece of 230 × 25 mm and a water content of 10% was coated with an aqueous UV-curable coating material (manufactured by Gengen Kagaku Co., Ltd., trade name Ultra V color) at a coating amount of 30 g / m 2 , and 80 W / cm 2
The coating film is cured by irradiating ultraviolet rays from the ultraviolet irradiation lamp under the conditions of irradiation distance of 150 mm and irradiation time of 20 seconds.
Then, the surface of the coating film is polished with # 180 sandpaper.
After that, a coating film made of the above water-based ultraviolet curable coating material is again provided on the polished coating surface under the same coating amount and the same irradiation condition. In this way, the base consisting of the sealer coating film and the intermediate coating film provided on the polished surface thereof is formed.
【００１４】次に下記成分を通常の粉体塗料製造法にし
たがい、プレミックス、コニーダーによる練合せ、粉砕
の後、１５０メッシュの篩で粗粒子を除いて、アクリル
系粉体塗料を製造した。 粉体塗料配合 ファインディック Ａ−２２４Ｓ ８５重量部 （大日本インキ化学工業（株）製アクリル系熱硬化型樹脂） ドデカン２酸 １４重量部 モダフロー １重量部 （モンサント社製）Next, according to the usual powder coating material production method, the following components were premixed, kneaded by a kneader and pulverized, and then coarse particles were removed with a 150 mesh screen to produce an acrylic powder coating material. Powder coating compound Finedic A-224S 85 parts by weight (Acrylic thermosetting resin manufactured by Dainippon Ink and Chemicals, Inc.) Dodecane diacid 14 parts by weight Modaflow 1 part by weight (manufactured by Monsanto)
【００１５】上記組成の粉体塗料を静電塗装装置により
膜厚約５０μの塗膜を形成するように塗布する。なお、
この粉体塗料を示差熱分析により融点を測定したところ
１３２℃であった。The powder coating composition having the above composition is applied by an electrostatic coating device so as to form a coating film having a film thickness of about 50 μm. In addition,
When the melting point of this powder coating material was measured by differential thermal analysis, it was 132 ° C.
【００１６】そして、電気加熱型セラミックヒーターを
使用して上記粉体塗膜に赤外線を照射してその塗膜を硬
化させる。その際、試験片と上記ヒータとの距離を８０
ｃｍとし、４分間赤外線を照射したところ、上記セラミ
ックヒータの表面温度が２６０℃、試験片の基材温度が
８０℃であったが、塗膜は透明、平滑であることが目視
され、塗膜の硬化度を示す後述するラビング試験の結果
は４回であった。これらの結果については後述する比較
例とともに表１に示す。標準例として上記粉体塗料を金
属板に塗布し、１７０℃で２０分加熱し、完全硬化した
と思われる塗膜について同様のラビング試験を行ったと
ころ、衝撃試験などの機械物性試験に合格する基準（ラ
ビング回数が５サイクル以上）を達成し、上記試験片の
塗膜もほぼこれに匹敵するものであった。Then, the powder coating film is irradiated with infrared rays using an electric heating type ceramic heater to cure the coating film. At that time, the distance between the test piece and the heater is set to 80.
The surface temperature of the ceramic heater was 260 ° C. and the base material temperature of the test piece was 80 ° C., but it was visually confirmed that the coating film was transparent and smooth. The result of a rubbing test, which will be described later, showing the curing degree of was 4 times. The results are shown in Table 1 together with Comparative Examples described later. As a standard example, the above powder coating was applied to a metal plate, heated at 170 ° C. for 20 minutes, and subjected to a similar rubbing test on a coating film which seems to be completely cured, and passed mechanical property tests such as an impact test. The standard (the number of rubbing times was 5 cycles or more) was achieved, and the coating film of the above-mentioned test piece was almost comparable.
【００１７】なお、試験片の基材温度の測定法、ラビン
グ試験の試験法は以下のとおりである。 （基材温度の測定）図１に示すように、縦２２０ｍｍ、
横２３０ｍｍの木質基材１に粉体塗料塗膜２を被覆した
試験片において、基材２の横方向の中心に、表面から
４．５ｍｍの位置に、直径３ｍｍ、深さ１００ｍｍの測
定器挿入用穴３をドリルであける。試験片の粉体塗膜２
に上記ヒータにより上記条件のもとで熱線を照射した直
後に、（株）鶴賀電気製作所製熱電温度計の測定器をこ
の測定器挿入用穴３の奥まで挿入し、基材表面直下約３
ｍｍの位置の温度を測定する。 （ラビング試験） シンナーによるラビング試験 シンナー（一般にはキシロール、メチルエチルケトン、
エタノール、イソプロピルアルコールなどを使用する
が、本実験ではラッカーシンナーを使用）を浸みこませ
たガーゼを試験片の塗膜の上に載せ、さらにガーゼに１
００ｇの荷重をかけて塗膜を擦り、塗膜が軟化して溶解
しはじめるまでの擦る回数を計数する。The method of measuring the substrate temperature of the test piece and the method of rubbing test are as follows. (Measurement of base material temperature) As shown in FIG.
In a test piece in which a wood base material 1 having a width of 230 mm is coated with the powder coating film 2, a measuring device having a diameter of 3 mm and a depth of 100 mm is inserted at a position 4.5 mm from the surface at the center of the base material 2 in the lateral direction. Drill the use hole 3. Powder coating of test piece 2
Immediately after irradiating a heat ray under the above conditions with the above heater, a measuring instrument of a thermoelectric thermometer manufactured by Tsuruga Denki Seisakusho Co., Ltd. was inserted into the measuring instrument insertion hole 3 to a depth of about 3 immediately below the substrate surface.
Measure the temperature at mm. (Rubbing test) Rubbing test with thinner Thinner (generally xylol, methyl ethyl ketone,
Use ethanol, isopropyl alcohol, etc., but in this experiment, use gauze soaked with lacquer thinner) and place it on the coating of the test piece.
The coating film is rubbed with a load of 00 g, and the number of rubbing until the coating film softens and starts to dissolve is counted.
【００１８】比較例１ 実施例１において、セラミックヒータの表面温度、赤外
線の照射時間を表１に示すように変えた以外は同様にし
て試験片の粉体塗料塗装体を得た。これらについても目
視により外観を調べた結果、上記ラビング試験を行った
結果及び基材温度の測定結果を表１に示す。Comparative Example 1 A powder paint-coated body of a test piece was obtained in the same manner as in Example 1 except that the surface temperature of the ceramic heater and the irradiation time of infrared rays were changed as shown in Table 1. Table 1 shows the results of visually inspecting the appearance of these materials, the results of the rubbing test, and the results of the substrate temperature measurement.
【００１９】[0019]
【表１】 [Table 1]
【００２０】比較例２ 実施例１において、セラミックヒータの表面温度を２６
０℃の一定にし、試験片と上記ヒータとの距離を表２に
示すように変えた以外は同様にして試験片の粉体塗料塗
装体を得た。これらについても目視により外観を調べた
結果、上記ラビング試験を行った結果及び基材温度を測
定した結果を表２に示す。Comparative Example 2 In Example 1, the surface temperature of the ceramic heater was set to 26
A powder paint-coated body of a test piece was obtained in the same manner except that the temperature was kept constant at 0 ° C. and the distance between the test piece and the heater was changed as shown in Table 2. Table 2 shows the results of visually inspecting the appearance of these materials, the results of the rubbing test, and the results of measuring the substrate temperature.
【００２１】[0021]
【表２】 [Table 2]
【００２２】なお、表１、２中、「外観」の項中、◎は
透明、平滑、○は白濁、□は発泡、△は凹凸を伴う著し
い発泡、×は粉体塗料塗膜に溶融しない部分がある、を
示す。In Tables 1 and 2, in the "Appearance" section, ⊚ is transparent and smooth, ∘ is cloudy, □ is foaming, Δ is remarkable foaming with unevenness, and x is not melted in the powder coating film. Indicates that there is a part.
【００２３】上記結果から、セラミックヒータの表面温
度が２６０℃、試験片とヒータとの距離が８０ｍｍであ
る実施例１のものは、外観、ラビング試験のいずれも良
く、赤外線の照射条件がこれらの条件よりはずれる比較
例のものはいずれも両方の試験結果を満足することがで
きないことがわかり、実施例１のものには局限加熱によ
る効果が現れていることがわかる。なお、実施例１にお
いて、セラミックヒータの表面温度を２５０〜２７０
℃、試験片とヒータとの距離を６０〜１００ｍｍとした
場合もほぼ実施例１に準ずる結果が得られた。なおま
た、この結果は上記粉体塗料を用いた場合であって、他
の粉体塗料を用いればこれに適合する他の赤外線の照射
条件があるが、他の粉体塗料の場合でも上記に準ずる条
件が例示される。From the above results, the ceramic heater having the surface temperature of 260 ° C. and the distance between the test piece and the heater of Example 1 of Example 1 is good in both appearance and rubbing test, and the infrared irradiation conditions are these. It is found that none of the comparative examples that deviate from the conditions can satisfy both test results, and it is understood that the effect of localized heating appears in the example 1. In the first embodiment, the surface temperature of the ceramic heater is set to 250 to 270.
Even when the temperature was set to 60 ° C. and the distance between the test piece and the heater was set to 60 to 100 mm, almost the same results as in Example 1 were obtained. In addition, this result is the case where the above powder coating material is used, and if other powder coating material is used, there are other infrared irradiation conditions suitable for this, but even in the case of other powder coating material, An example of the conditions that are the same is shown.
【００２４】上記実施例は粉体塗料塗膜をセラミックヒ
ータの１回の照射で加熱処理したが、第１回目の加熱で
粉体塗料塗膜を発泡しない状態で架橋を進め、粉体塗料
塗膜をラビング回数２回程度の半架橋程度にとどめ、一
定時間常温または低温で保存して、基材の内部温度を一
旦低下させた後、再度セラミックヒータにより加熱する
ことにより発泡のない完全硬化塗膜を得るようにしても
良い。この方法によれば、第１回目の加熱により、塗布
膜の加熱時の軟化は少なくなり、より強度の大きい熱線
による加熱を行なっても発泡の危険性は減少するので、
硬化速度の遅い粉体塗料の塗膜を形成する場合や、含水
量が多くて発泡し易い基材を用いる場合には、その基材
の昇温を防ぐことにより発泡を抑制することができるの
で有利である。なお、このような２段加熱に限らず、さ
らに多段加熱を行っても良く、これらの加熱は基材の温
度を検知し、そのデータに基づいてコンピュータ制御す
ることもでき、このようにすると上記の発泡現象の発生
を精密に抑制することができるとともに、塗装工程を自
動化することができるので好ましい。１段加熱の場合に
も同様にコンピュータ制御を行っても良い。上記は熱線
のみにより加熱したが、他の塗膜硬化手段を併用しても
よい。In the above example, the powder coating film was heat-treated by one irradiation of the ceramic heater. The film is kept at about half-crosslinking with rubbing about 2 times, stored at room temperature or low temperature for a certain period of time, the internal temperature of the substrate is once lowered, and then it is heated again by a ceramic heater to completely cure the coating without foaming. You may make it obtain a film. According to this method, by the first heating, the softening of the coating film at the time of heating is reduced, and the risk of foaming is reduced even if heating with a stronger heat ray is performed.
When forming a coating film of a powder coating having a slow curing rate, or when using a base material having a high water content and easily foaming, foaming can be suppressed by preventing the temperature rise of the base material. It is advantageous. It should be noted that the present invention is not limited to such two-stage heating, and multi-stage heating may be performed, and such heating can detect the temperature of the substrate and be computer-controlled based on the data. It is preferable because the occurrence of the bubbling phenomenon can be precisely suppressed and the coating process can be automated. Computer control may also be performed in the case of one-stage heating. Although the above is heated only by the heat ray, other coating film curing means may be used in combination.
【発明の効果】本発明によれば、多孔質基材にシーラ
ー、中塗り塗料を塗布し、その塗膜の上に粉体塗料の塗
布層を形成し、その塗布層にほぼ局限して熱線を照射し
たので、加熱は粉体塗料の塗布層にほぼ限って行われ、
多孔質基材はその内在する水分等が放出されるほどには
加熱されないようにすることができ、これにより粉体塗
料塗膜に発泡現象等が生じるのを避けることができ、平
滑な塗膜を得ることができる。According to the present invention, a sealer and an intermediate coating material are applied to a porous substrate, a powder coating material coating layer is formed on the coating material, and the heat ray is almost localized in the coating layer. Since it was irradiated, heating is limited to the coating layer of powder coating,
It is possible to prevent the porous base material from being heated to such an extent that the water contained therein is released, thereby avoiding the foaming phenomenon or the like in the powder paint coating film, and smoothing the coating film. Can be obtained.
【００２５】このように、多孔質基材内の水分の影響を
受けることなく、美麗、平滑な粉体塗料塗膜が得られる
ので、特に上記した予熱による塗膜形成方法が適用でき
ず、金属板をアイロンのように使用する塗膜形成方法も
煩わしい木質基材に対する粉体塗料塗装方法として実用
価値が大きい。また、他の多孔質基材に対してもその塗
装方法が簡明であるから、粉体塗料の塗膜を的確、能率
的に形成することができる。As described above, since a beautiful and smooth powder coating film can be obtained without being affected by the water content in the porous substrate, the above-mentioned method for forming a coating film by preheating cannot be applied, and a metal coating can be used. A coating film forming method using a plate like an iron is also of great practical value as a powder coating method for a troublesome wooden base material. Moreover, since the coating method is simple for other porous substrates, the coating film of the powder coating material can be formed accurately and efficiently.
【図１】本発明の方法を実施した際の基材の温度を測定
するための試験片を示す。 １ 基材 ２ 粉体塗料塗膜 ３ 測定器挿入用穴FIG. 1 shows a test piece for measuring the temperature of a substrate when carrying out the method of the present invention. 1 Base material 2 Powder coating film 3 Measuring instrument insertion hole
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０５Ｄ 7/24 ３０１ Ｎ 8720−4Ｄ Ａ 8720−4Ｄ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location B05D 7/24 301 N 8720-4D A 8720-4D
Claims (1)
と、該シーラー塗装体を研磨する工程と、該研磨面に中
塗り塗料を塗布する工程と、該中塗り塗膜の上に粉体塗
料を塗布する工程と、該粉体塗料塗布層をほぼ局限加熱
する熱線照射工程を有する多孔質基材粉体塗料塗装体の
製造方法。1. A step of applying a sealer to a porous substrate, a step of polishing the sealer-coated body, a step of applying an intermediate coating material to the polished surface, and a powder on the intermediate coating film. A method for producing a porous base material powder coating material comprising a step of applying a coating material and a heat ray irradiation step of substantially locally heating the powder coating material coating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11249593A JPH06296926A (en) | 1993-04-16 | 1993-04-16 | Production of coated body with porous base material powder paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11249593A JPH06296926A (en) | 1993-04-16 | 1993-04-16 | Production of coated body with porous base material powder paint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06296926A true JPH06296926A (en) | 1994-10-25 |
Family
ID=14588085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11249593A Pending JPH06296926A (en) | 1993-04-16 | 1993-04-16 | Production of coated body with porous base material powder paint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06296926A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921622A (en) * | 2012-11-23 | 2013-02-13 | 中信戴卡股份有限公司 | Coating process for finish-turned silver-electroplated wheel |
-
1993
- 1993-04-16 JP JP11249593A patent/JPH06296926A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921622A (en) * | 2012-11-23 | 2013-02-13 | 中信戴卡股份有限公司 | Coating process for finish-turned silver-electroplated wheel |
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