JPS5946173A - Coating method - Google Patents

Abstract

PURPOSE:To dry a coating film in a short time, by applying polyester enamel to which a curing accelerator is added onto a substrate material coated with a primer paint to which a curing agent is added, and then subjecting the coated surface to ultraviolet irradiation. CONSTITUTION:After a coating film is formed by applying finish paint 3 of polyester enamel resin to which a curing accelerator such as cobalt naphthenate is added onto a substrate material 1 coated with a primer paint 2 such as polyurethane resin to which a curing agent such as methyl ethyl ketone peroxide is added, the coated surface is exposed to ultraviolet rays irradiation 4. Thus, a time necessary for dry curing is remarkably shortened, and the flatness of the coated surface is improved.

Description

【発明の詳細な説明】 この発明は、塗装素材（木材あるいは合板）にポリエス
テルエナメル（例えば黒）樹脂塗装を施し、この塗膜に
紫外線を照射して塗膜を短時間に乾燥硬化させる塗装方
法を提供するものである。[Detailed description of the invention] This invention is a coating method in which a polyester enamel (for example, black) resin coating is applied to a coating material (wood or plywood), and this coating film is irradiated with ultraviolet rays to dry and harden the coating film in a short time. It provides:

従来、例えばポリエステル黒エナメル樹脂塗装を施す場
合、一つの方法として、まず下塗り塗料としてポリエス
テル樹脂塗料を塗布し、これを２時間から２４時間■て
乾燥硬化させ、この下塗り塗膜を軽く研削した後、この
下塗り塗膜上にポリエステル黒エナメル樹脂塗料を塗布
する方法がある。この場合の上塗り塗料は、メチル・エ
チルケトン・パーオキサイド等の硬化剤を添加したポリ
エステル黒エナメル樹脂塗料を、ナフテン酸コバルト等
の硬化促進剤を添加したポリエステル黒エナメル樹脂塗
料とを用意し、これらを混合して塗布するか、あるいは
分別して塗布する。Conventionally, for example, when applying a polyester black enamel resin coating, one method is to first apply a polyester resin paint as an undercoat, allow it to dry and harden for 2 to 24 hours, and then lightly grind this undercoat film. There is a method of applying a polyester black enamel resin paint onto this undercoat film. In this case, the top coat is prepared by preparing a polyester black enamel resin paint containing a curing agent such as methyl ethyl ketone peroxide, and a polyester black enamel resin paint containing a curing accelerator such as cobalt naphthenate. Apply mixed or separate.

この上塗り塗料の塗膜を乾燥硬化させるのには２時間か
ら２４時間を要していた。この方法は乾燥時間が長くて
作業効率が悪く、又塗料の残液処理量が多くて塗料効率
も悪いという欠点がある。It took 2 to 24 hours to dry and harden the coating film of this top coat. This method has disadvantages in that the drying time is long, resulting in poor work efficiency, and the amount of residual paint liquid to be treated is large, resulting in poor paint efficiency.

又、他の方法として、リアクションプライマー塗装法と
呼ばれる方法がある。これはまず塗装素材に硬化剤とし
て過酸化物（例えばメチル・エチルケント・パーオキサ
イド）を添加した下塗り塗料（プライマー）を塗布し、
ただちに（乾燥硬化しないうちに）、この上に硬化促進
剤として金属石鹸（例えばナフテン酸コバルト）を添加
した上塗り塗料（ポリエステル黒エナメル樹脂）を塗布
し、加熱状態で１時間から２４時間かけて乾燥硬化させ
る方法である。この方法も乾燥時間が長くて作業効率が
悪く、そのうえ上塗り・下塗りの両塗膜の合計が２５０
ミクロンまでが限度であり、これ以上の塗膜は硬化剤の
反応状無理である。Further, as another method, there is a method called a reaction primer coating method. First, an undercoat (primer) containing peroxide (e.g. methyl ethyl chloride peroxide) as a hardening agent is applied to the paint material.
Immediately (before it dries and hardens), apply a top coat (polyester black enamel resin) containing metal soap (e.g. cobalt naphthenate) as a curing accelerator, and dry under heat for 1 to 24 hours. This is a method of curing. This method also takes a long time to dry and is inefficient, and furthermore, the total coating film of both the top coat and base coat is 250.
The limit is up to microns, and a coating film larger than this is unreasonable due to the reaction of the curing agent.

更に他の方法として、ポリエステル黒エナメル樹脂を下
塗り塗料として塗装素材に塗布し、２時間から２４時間
かけて乾燥硬化させ、軽く研削した後、上塗り塗料とし
て光増感剤が添加された透明の樹脂（ポリエステルクリ
ヤー）を塗布し、ただちに紫外線照射によりこの上塗り
塗料を乾燥硬化させる方法がある。Still another method is to apply polyester black enamel resin as an undercoat to the painted material, dry and cure for 2 to 24 hours, lightly grind, and then apply a transparent resin to which a photosensitizer has been added as a topcoat. There is a method of applying a polyester clear (polyester clear) and immediately drying and curing this top coat by irradiating it with ultraviolet rays.

しかし、これも下塗り塗料の乾燥硬化に時間がかかり、
又塗装仕上り感が悪く、下塗りの塗面の傷等がそのまま
塗装表面に現われてしまうという欠点がある。However, this also takes time for the undercoat to dry and harden.
Another disadvantage is that the finish of the paint is poor, and scratches on the undercoat surface appear as they are on the painted surface.

この発明は前述した各塗装方法の欠点を解消するもので
あり、メチル・エチルケトン・パーオキサイド等の硬化
剤を添加したポリウレタン樹脂等からなる下塗り塗料を
塗装素材に塗布し、該下塗り塗料上にナフテン酸コバル
ト等の硬化促進剤を添加した紫外線硬化用ポリエステル
エナメル樹脂からなる上塗り塗料を塗布して前記塗装素
材上に塗膜を形成し、該塗膜へ紫外線を照射して該塗膜
を乾燥硬化させてなる。This invention solves the drawbacks of each of the above-mentioned coating methods, and involves applying an undercoat made of polyurethane resin or the like to which a hardening agent such as methyl, ethyl ketone, peroxide, etc. has been added to the painting material, and applying naphthene on the undercoat. A top coat made of ultraviolet curing polyester enamel resin containing a curing accelerator such as cobalt acid is applied to form a coating film on the coating material, and the coating film is irradiated with ultraviolet rays to dry and cure. I'll let you.

図面にこの発明の一実施例を示して説明する。An embodiment of the invention will be described with reference to the drawings.

（１）まず、塗装素材１として木材あるいは合板（ある
いは木材又は合板上に樹脂含浸板を貼ったものも含む）
が用意される。（２）この塗装素材１の表面に、下塗り
塗料としてポリエステル樹脂又はポリウレタン樹脂１０
０部に硬化剤としてのメチル・エチルケトン・パーオキ
サイド４０〜６０％溶液を５〜１０部、及び溶剤（シン
ナー）を１０〜５０部を各混合して塗布量５０〜１５０
ｇ／ｍ２にて吹付け、■ロー■ーター、又はロール■ー
ターで塗布し、３〜１０分間乾燥して下塗り塗膜２を形
成する。（３）この下塗り塗装膜２の上に上塗り塗料と
して光増感剤が添加された紫外線硬化用のポリエステル
黒エナメル樹脂１００部に硬化促進剤としてのコバルト
石鹸６％溶液を１〜５部、及び溶剤（シンナー）を５〜
２０部を各混合して塗布量４５０〜７５０ｇ／ｍ２にて
吹付けあるいは■ロー■ーターで塗布し、３〜５分間乾
燥して上塗り塗装膜３を形成する。そして更に、（４）
塗装面を１〜２分間紫外線４を照射して乾燥硬化させる
ものである。(1) First, the coating material 1 is wood or plywood (or wood or plywood with a resin-impregnated board pasted).
will be prepared. (2) Apply polyester resin or polyurethane resin 10 as an undercoat to the surface of this coating material 1.
0 parts, 5 to 10 parts of a 40 to 60% solution of methyl ethyl ketone peroxide as a hardening agent, and 10 to 50 parts of a solvent (thinner) to make a coating amount of 50 to 150 parts.
It is applied by spraying at g/m2 using a rotor or a roll rotor, and is dried for 3 to 10 minutes to form an undercoat film 2. (3) 1 to 5 parts of a 6% solution of cobalt soap as a curing accelerator to 100 parts of a polyester black enamel resin for ultraviolet curing to which a photosensitizer has been added as a top coat on this undercoat film 2, and Solvent (thinner) 5~
20 parts of each are mixed and applied by spraying or using a rotor at a coating amount of 450 to 750 g/m2, and dried for 3 to 5 minutes to form the top coat film 3. And furthermore, (4)
The painted surface is irradiated with ultraviolet 4 for 1 to 2 minutes to dry and harden.

この発明においては、硬化剤添加の下塗り塗料と硬化促
進剤添加の上塗り塗料の下部（接触面付近）とは硬化剤
及び硬化促進剤によって反応硬化すると共に、上塗り塗
料の上部は、この塗料自身が紫外線硬化用であるから、
紫外線によって反応硬化することとなる。In this invention, the lower part (near the contact surface) of the undercoat containing a curing agent and the top coat containing a curing accelerator is reacted and cured by the curing agent and curing accelerator, and the upper part of the top coat is cured by the coating itself. Because it is for ultraviolet curing,
It will be reactively cured by ultraviolet rays.

したがって上塗り塗料が厚くても硬化時間は非常に短縮
されることとなる。Therefore, even if the top coat is thick, the curing time will be significantly shortened.

以上のように、この発明の方法によれば、下塗り塗装工
程と上塗り塗装工程とが一連の作業となって作業時間が
大幅に短縮され、塗装面の平滑性が向上し、最終の研削
作業が極めて容易となり、さらに塗料効率が向上する等
多くの効果を有するものである。As described above, according to the method of the present invention, the undercoat painting process and the topcoat painting process become a series of operations, which greatly reduces the working time, improves the smoothness of the painted surface, and reduces the final grinding work. It is extremely easy to apply, and has many effects such as improved coating efficiency.

【図面の簡単な説明】[Brief explanation of the drawing]

図面はこの発明の■実施例による塗装方法の工程図であ
る。 １・・・・・・・・・塗装素材、２・・・・・・・・・
下塗り塗膜、３・・・・・・・・・上塗り塗膜、４・・
・・・・・・・紫外線。 特許出願人 株式会社河合楽器製作所 代表者　河合滋 浜二ペイント株式会社 代表者　岡本一■The drawings are process diagrams of the coating method according to the embodiment (1) of the present invention. １・・・・・・・・・Painting material, ２・・・・・・・・・
Undercoat film, 3...Top coat film, 4...
......Ultraviolet light. Patent applicant Kawai Musical Instruments Manufacturing Co., Ltd. Representative: Shigehama Kawai Paint Co., Ltd. Representative: Hajime Okamoto

Claims (1)

【特許請求の範囲】[Claims] メチル・エチルケトン・パーオキサイド等の硬化材を添
加したポリウレタン樹脂等からなる下塗り塗料を塗装素
材に塗布し、該下塗り塗料上にナフテン酸コバルト等の
硬化促進剤を添加した紫外線硬化用のポリエステルエナ
メル樹脂からなる上塗り塗料を塗布して前記塗装素材上
に塗膜を形成し、該塗膜へ紫外線を照射して該塗膜を乾
燥硬化させてなる塗装方法。A polyester enamel resin for ultraviolet curing, in which an undercoat made of polyurethane resin containing a curing agent such as methyl, ethyl ketone, peroxide, etc. is applied to the coating material, and a curing accelerator such as cobalt naphthenate is added to the undercoat. A coating method comprising: forming a coating film on the coating material by applying a top coat consisting of the above, and drying and curing the coating film by irradiating the coating film with ultraviolet rays.