JPS62252434A - Coating of synthetic resin molding - Google Patents
Coating of synthetic resin moldingInfo
- Publication number
- JPS62252434A JPS62252434A JP61095888A JP9588886A JPS62252434A JP S62252434 A JPS62252434 A JP S62252434A JP 61095888 A JP61095888 A JP 61095888A JP 9588886 A JP9588886 A JP 9588886A JP S62252434 A JPS62252434 A JP S62252434A
- Authority
- JP
- Japan
- Prior art keywords
- paint
- coating
- low
- synthetic resin
- temperature baking
- 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
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 16
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 16
- 238000000576 coating method Methods 0.000 title abstract description 32
- 239000011248 coating agent Substances 0.000 title abstract description 26
- 238000000465 moulding Methods 0.000 title abstract 4
- 239000003973 paint Substances 0.000 claims abstract description 50
- 239000003054 catalyst Substances 0.000 claims abstract description 13
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 5
- 238000010422 painting Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 210000003298 dental enamel Anatomy 0.000 abstract 5
- 239000000758 substrate Substances 0.000 abstract 2
- 230000001464 adherent effect Effects 0.000 abstract 1
- 230000035699 permeability Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 37
- 238000001723 curing Methods 0.000 description 9
- 239000006260 foam Substances 0.000 description 5
- -1 R-RIM Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 150000007942 carboxylates Chemical class 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000008199 coating composition Substances 0.000 description 2
- 229920005906 polyester polyol Polymers 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 1
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229960002887 deanol Drugs 0.000 description 1
- RXKJFZQQPQGTFL-UHFFFAOYSA-N dihydroxyacetone Chemical compound OCC(=O)CO RXKJFZQQPQGTFL-UHFFFAOYSA-N 0.000 description 1
- 239000012972 dimethylethanolamine Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- GIWKOZXJDKMGQC-UHFFFAOYSA-L lead(2+);naphthalene-2-carboxylate Chemical compound [Pb+2].C1=CC=CC2=CC(C(=O)[O-])=CC=C21.C1=CC=CC2=CC(C(=O)[O-])=CC=C21 GIWKOZXJDKMGQC-UHFFFAOYSA-L 0.000 description 1
- AYLRODJJLADBOB-QMMMGPOBSA-N methyl (2s)-2,6-diisocyanatohexanoate Chemical compound COC(=O)[C@@H](N=C=O)CCCCN=C=O AYLRODJJLADBOB-QMMMGPOBSA-N 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- CHJMFFKHPHCQIJ-UHFFFAOYSA-L zinc;octanoate Chemical compound [Zn+2].CCCCCCCC([O-])=O.CCCCCCCC([O-])=O CHJMFFKHPHCQIJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、表層に発泡層すなわち空気がたまる微細な凹
部を有するプラスック素材、例えばＲＩＭやＳＭＣによ
って形成された合成樹脂成形品の塗装方法に関し、特に
、塗膜の密着性を向上させ得ると共にピンホールの発生
を防止し得る塗装方法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of painting a synthetic resin molded product made of plastic material, such as RIM or SMC, which has a foam layer on the surface layer, that is, minute recesses where air accumulates. In particular, the present invention relates to a coating method that can improve the adhesion of a coating film and prevent the formation of pinholes.
（従来技術）
ＲＩＭ、Ｒ−ＲＩＭ、ＳＭＣ等のプラスチ・ツク素材で
形成した合成樹脂成形品には、その表層に発泡層が存在
する。したがって、これらの成形品の塗装を施し、塗装
焼付時に加熱すると、発泡層内の空気が膨張して塗膜ピ
ンホールを生成し、塗装品質を著しく低下させている。(Prior Art) Synthetic resin molded products made of plastic materials such as RIM, R-RIM, and SMC have a foam layer on their surface layer. Therefore, when these molded products are coated and heated during coating baking, the air in the foam layer expands, producing pinholes in the coating film, significantly reducing the quality of the coating.
かかるピンホールの生成を防止し、塗装品質を向上させ
るため、従来から、塗料を低温で硬化させ得ると共に強
靭な塗膜を形成することができる紫外線硬化法（特公昭
５３−１９０３８号公報参照）等が提案されている。In order to prevent the formation of such pinholes and improve coating quality, ultraviolet curing methods have been used that can cure coatings at low temperatures and form tough coatings (see Japanese Patent Publication No. 19038/1983). etc. have been proposed.
（発明が解決しようとする問題点）
しかし、紫外線硬化法や触媒硬化法ではピンホールの生
成は抑止できるものの、塗料の被塗物に対する浸透力が
充分ではないため塗膜の剥離等を生じる場合がある。(Problems to be Solved by the Invention) However, although the ultraviolet curing method and catalyst curing method can suppress the formation of pinholes, the penetration power of the paint into the coated object is not sufficient, so peeling of the paint film may occur. There is.
そこで、本発明の目的は、表層に発泡層のあるプラスチ
ック素材を塗装する場合にも、ピンホールの発生を抑止
できると共に塗膜の被塗物に対する密着性を充分に確保
することのできるようにした合成樹脂成形品の塗装方法
を提供することにある。Therefore, the purpose of the present invention is to prevent the occurrence of pinholes even when painting plastic materials with a foam layer on the surface, and to ensure sufficient adhesion of the paint film to the object to be coated. An object of the present invention is to provide a method for coating synthetic resin molded products.
（問題点を解決するための手段、作用）上述の目的を達
成するため、本発明の塗装方法は次のような構成としで
ある。すなわち、合成樹脂成形品の被塗面に、内部浸透
力の大きな溶剤を含む密着力の高い低温焼付用塗料を塗
布する工程と、
未硬化状態にある前記低温焼付用塗料上に２液ウレタン
塗料を塗布する工程と、
低温度かつ硬化用触媒の雰囲気下で、前記低温焼付用塗
料を未硬化状態に維持しつつ前記２液ウレタン塗料のみ
を急速硬化させる工程と、前記低温焼付用塗料を硬化さ
せる焼付工程と、を備えた構成としである。(Means and operations for solving the problems) In order to achieve the above-mentioned object, the coating method of the present invention has the following configuration. That is, a process of applying a low-temperature baking paint with high adhesion that contains a solvent with a high internal penetration power to the surface of the synthetic resin molded product, and a two-component urethane paint on the uncured low-temperature baking paint. a step of rapidly curing only the two-component urethane paint while maintaining the low-temperature baking paint in an uncured state at low temperature and in an atmosphere of a curing catalyst; and curing the low-temperature baking paint. This configuration includes a baking process to make the image.
かかる構成を有する本発明の塗装方法によれば、塗膜の
下層を形成する塗料が内部浸透力の大きな溶剤を含むた
め、塗膜の被塗物に対する密着力が極めて大さいものと
なる。According to the coating method of the present invention having such a configuration, since the coating material forming the lower layer of the coating film contains a solvent with high internal penetration power, the adhesion of the coating film to the object to be coated becomes extremely high.
また、触媒雰囲気において低温で急速硬化する２液ウレ
タン塗料であらかじめ塗膜の上層を形成することにより
、被塗物の表層にある気泡が塗膜下に封じ込められるこ
ととなる。すなわち、引き続く焼付工程の際に被塗物の
表層にある空気が膨張しても、この膨張した空気があら
かじめ硬化された塗膜上層を突き破ることがなく、ピン
ホールの発生が確実に防止される。Furthermore, by forming the upper layer of the coating film in advance with a two-component urethane paint that hardens rapidly at low temperatures in a catalytic atmosphere, air bubbles on the surface layer of the object to be coated can be contained under the coating film. In other words, even if the air on the surface layer of the object to be coated expands during the subsequent baking process, this expanded air will not break through the pre-cured upper layer of the coating, and the generation of pinholes will be reliably prevented. .
（実施例）
以下本発明の実施例を添付した図面に基づいて説明する
。(Example) Examples of the present invention will be described below based on the attached drawings.
まず、第１図に示すように、合成樹脂成形品ｌの被塗面
１ａに、内部浸透力の大きな溶剤を含む密着力の高い低
温焼付用塗料をロール法、スプレー法等によって塗布す
ることにより、塗料下層Ｂを形成する。このとき、被塗
面１ａの発泡層内の気泡１ｂは塗料下層Ｂで覆われる。First, as shown in Figure 1, a low-temperature baking paint with high adhesion and containing a solvent with high internal penetration power is applied to the coated surface 1a of a synthetic resin molded product l by a roll method, a spray method, etc. , forming a paint lower layer B. At this time, the air bubbles 1b in the foam layer on the surface to be coated 1a are covered with the paint lower layer B.
この塗料下層Ｂを形成するのに適した塗料系の塗料タイ
プは、官能基の多い１液ウレタン塗料であり、樹脂はウ
レタン変成ポリエステル−アミノ樹脂である。The paint type suitable for forming the paint lower layer B is a one-component urethane paint with many functional groups, and the resin is a urethane-modified polyester-amino resin.
次に、未硬化状態にある塗料下層Ｂ上に、触媒雰囲気に
おいて低温で急速硬化する塗料をスプレー法等によって
塗布ことにより、塗料上層Ａを形成する。これにより、
塗料下層Ａと塗料上層Ｂとからなる二重層の塗料層２が
形成される。上記塗料上層Ａを形成するのに適した塗料
系の塗料タイプは２液ウレタン塗料であり、樹脂はポリ
エステル系ポリオール又はアクリル系ポリオールである
。そして、硬化剤としては脂肪族インシアネート （ヘ
キサメチレンジイソシアネート、又はリジンジイソシア
ネート等）や芳香族イソシアネート（キシレンジイソシ
アネート、又はトリレジイソシアネート等）が適してお
り、触媒としては、カルボン酸塩（ラウリル酸ジブチル
すず、又はオクチル酸亜鉛、又はナフテン酸鉛等）が適
している。Next, on the uncured lower paint layer B, a paint that hardens rapidly at low temperatures in a catalytic atmosphere is applied by a spray method or the like to form an upper paint layer A. This results in
A double-layer paint layer 2 consisting of a lower paint layer A and an upper paint layer B is formed. The paint type suitable for forming the above-mentioned paint upper layer A is a two-component urethane paint, and the resin is a polyester polyol or an acrylic polyol. As curing agents, aliphatic incyanates (hexamethylene diisocyanate, lysine diisocyanate, etc.) and aromatic isocyanates (xylene diisocyanate, trirediisocyanate, etc.) are suitable, and as catalysts, carboxylates (dibutyltin laurate, etc.) are suitable. , zinc octylate, lead naphthenate, etc.) are suitable.
次いで、第３図及び第４図に示すように 一定の温度雰
囲気を作り（通常は５０℃以下）、塗料下層Ｂを未硬化
状態に維持したまま、塗料層２とりわけ塗料下層Ｂから
溶剤を十分に揮発させ、後の工程において溶剤がピンホ
ール発生の原因とならないようにされる。Next, as shown in Figures 3 and 4, a constant temperature atmosphere is created (usually below 50°C), and the solvent is sufficiently removed from the paint layer 2, especially the lower paint layer B, while keeping the lower paint layer B in an uncured state. This prevents the solvent from causing pinholes in later steps.
溶剤が充分に揮発した後、その温度雰囲気のまま塗料上
層Ａを硬化させるための触媒濃度を上昇させ、塗料下層
Ｂを未硬化状態に維持しつつ、当該塗料上層Ａのみを急
速硬化させ（第３図、第５図参照）、硬化した塗膜上層
Ａ′を形成する（第２図参照）。これにより、この後温
度を上昇させても、気泡１ｂ（第１図参照）が硬化した
塗膜上層Ａ′を破壊し得ないようになる。なお、使用す
る触媒としては、脂肪族第３級アミン（ジメチルエタノ
ールアミン、又はトリエチルアミン、又はテトラメチル
エチレンジアミン等）がａする。After the solvent has sufficiently volatilized, the catalyst concentration for curing the upper paint layer A is increased in the same temperature atmosphere, and while the lower paint layer B is maintained in an uncured state, only the upper paint layer A is rapidly cured (the 3 and 5), and a cured coating film upper layer A' is formed (see FIG. 2). This prevents the bubbles 1b (see FIG. 1) from destroying the cured upper layer A' even if the temperature is subsequently increased. The catalyst used is an aliphatic tertiary amine (dimethylethanolamine, triethylamine, tetramethylethylenediamine, etc.).
下層Ｂ′を形成することにより、最終的に、それぞれ硬
化した塗膜上層Ａ′と塗膜下層Ｂ′との二重層となった
塗膜２′が得られる（第２図参照）。By forming the lower layer B', a coating film 2' is finally obtained which is a double layer consisting of a cured upper coating layer A' and a lower coating layer B' (see FIG. 2).
さて次に、本発明の実験例について説明するが、実験条
件は下記の通りである。Next, an experimental example of the present invention will be described, and the experimental conditions are as follows.
（１）下層Ｂの塗料組成
樹脂：ウレタン変性ポリエステル １００部溶剤二Ｎ−
メチルーＺ−ピロリドン ７０部芳香族炭化水素、ケト
ン
粘度：１４秒／Ｎ０４フォードカップ７２０℃膜厚：１
５〜２０勝
（２）上層Ａの塗料組成
樹脂：ポリエステルポリオール １００部硬化剤：
脂肪族インシアネート ２０部触媒：カルボン酸
塩 ０．２部溶剤：芳香族炭化水素、脂
肪族ケトン ７０部粘度＝１４秒／ Ｎ ｏ ４７ ＊
−ドカップ／２０℃膜厚：２５〜３０川
（３）触媒雰囲気下での硬化条件
触媒ニジメチルエタノールアミン
濃度１０００〜２０００ｐｐｍ
雰囲気温度：２０〜３０℃
触媒雰囲気暴露時間＝５〜１０分
（４）焼付（ポストキュア）：６０〜９０℃ＸＩＯ〜２
０分
（５）合成樹脂成形品Ｉ Ｒ−ＲＩＭ以上のような条
件下で得られた塗膜２′においては、ピンホールの発生
が無く、また合成樹脂成形品ｌから塗膜２′を剥離させ
るピーリング強度は１８００〜２０００ｇ／ｃｍと十分
に大きなものであった。なお、合成樹脂成形品ｌに塗料
上層Ａ′のみを塗布してこれを触媒雰囲気下で急速硬化
させた従来のものでは、ピーリング強度は１３００〜１
６００ｇ／Ｃｍであった。(1) Lower layer B coating composition Resin: Urethane modified polyester 100 parts Solvent 2N-
Methyl-Z-pyrrolidone 70 parts Aromatic hydrocarbon, ketone Viscosity: 14 seconds/N04 Ford cup 720°C Film thickness: 1
5 to 20 wins (2) Upper layer A coating composition Resin: Polyester polyol 100 parts Hardening agent:
Aliphatic incyanate 20 parts Catalyst: Carboxylate 0.2 parts Solvent: Aromatic hydrocarbon, aliphatic ketone 70 parts Viscosity = 14 seconds/N o 47 *
-Cup/20℃ Film thickness: 25~30℃ (3) Curing conditions under catalyst atmosphere Catalyst Nidimethylethanolamine concentration 1000~2000ppm Atmosphere temperature: 20~30℃ Catalyst atmosphere exposure time = 5~10 minutes (4) Baking (post cure): 60~90℃XIO~2
0 minutes (5) Synthetic resin molded product I R-RIM In the coating film 2' obtained under the above conditions, no pinholes were generated, and the coating film 2' was peeled from the synthetic resin molded product I. The resulting peeling strength was 1,800 to 2,000 g/cm, which was sufficiently large. In addition, in the conventional method in which only the upper paint layer A' was applied to the synthetic resin molded product L and this was rapidly cured in a catalyst atmosphere, the peeling strength was 1300 to 1.
It was 600g/Cm.
（発明の効果）
本発明は以上述べたことから明らかなように、ピンホー
ルの発生が無くかつ合成樹脂成形品に対する密着性の優
れた塗膜を形成することができる。(Effects of the Invention) As is clear from the above description, the present invention can form a coating film that does not generate pinholes and has excellent adhesion to synthetic resin molded articles.
第１図は合成樹脂成形品に上下２暦に塗料を塗布した直
後の状態を示す断面図。
第２図は第１図の塗料層をそれぞれ硬化させた状態を示
す断面図。
第３図は第１図の状態から上下の塗料層を硬化させるま
での間の制御例を表わす図。
第４図は溶剤揮発時間と塗料中の不揮発分濃度との関係
を示す図。
第５図は触媒雰囲気暴露時間と塗料のゲル分率との関係
を示す図。
第６図は焼付時間と塗料のゲル分率との関係を示す図。
ｌ二合成樹脂成形品
２：塗料（未硬化）
Ａ：塗料上層（未硬化）
Ｂ：塗料下層（未硬化）
２′：塗膜（硬化）
Ａ′：塗膜上層（硬化）
Ｂ′：塗膜下層（硬化）
Ａ、Ｂ層１′Ｐ４不厚発分濃度 ％
導片ル
γル分学
ケ゛ル令宰FIG. 1 is a sectional view showing the state immediately after coating a synthetic resin molded product with paint on the upper and lower sides. FIG. 2 is a sectional view showing the state in which the paint layers shown in FIG. 1 are cured. FIG. 3 is a diagram showing an example of control from the state shown in FIG. 1 until the upper and lower paint layers are cured. FIG. 4 is a diagram showing the relationship between solvent volatilization time and nonvolatile content concentration in the paint. FIG. 5 is a diagram showing the relationship between catalyst atmosphere exposure time and gel fraction of paint. FIG. 6 is a diagram showing the relationship between baking time and gel fraction of paint. l2 Synthetic resin molded product 2: Paint (uncured) A: Upper paint layer (uncured) B: Lower paint layer (uncured) 2': Coating film (cured) A': Upper coating layer (cured) B': Paint Lower film layer (cured) A, B layer 1'P4 non-thickness concentration % Conductor group γ-scale separation model control
Claims (1)
溶剤を含む密着力の高い低温焼付用塗料を塗布する工程
と、 未硬化状態にある前記低温焼付用塗料上に２液ウレタン
塗料を塗布する工程と、 低温度かつ硬化用触媒の雰囲気下で、前記低温焼付用塗
料を未硬化状態に維持しつつ前記２液ウレタン塗料のみ
を急速硬化させる工程と、 前記低温焼付用塗料を硬化させる焼付工程と、を備えて
いることを特徴とする合成樹脂成形品の塗装方法。(1) A process of applying a low-temperature baking paint with high adhesion that contains a solvent with high internal penetration power to the surface of the synthetic resin molded product, and applying two-component urethane on the uncured low-temperature baking paint. a step of applying a paint; a step of rapidly curing only the two-component urethane paint while maintaining the low temperature baking paint in an uncured state at low temperature and an atmosphere of a curing catalyst; and curing the low temperature baking paint only. A method for painting a synthetic resin molded product, comprising: a baking step for hardening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61095888A JPS62252434A (en) | 1986-04-26 | 1986-04-26 | Coating of synthetic resin molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61095888A JPS62252434A (en) | 1986-04-26 | 1986-04-26 | Coating of synthetic resin molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62252434A true JPS62252434A (en) | 1987-11-04 |
Family
ID=14149849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61095888A Pending JPS62252434A (en) | 1986-04-26 | 1986-04-26 | Coating of synthetic resin molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62252434A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01170622A (en) * | 1987-12-25 | 1989-07-05 | Toyota Motor Corp | Coating of frp molded article |
| JP2005046789A (en) * | 2003-07-31 | 2005-02-24 | Pritec:Kk | Method for resin coating |
-
1986
- 1986-04-26 JP JP61095888A patent/JPS62252434A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01170622A (en) * | 1987-12-25 | 1989-07-05 | Toyota Motor Corp | Coating of frp molded article |
| JPH0618910B2 (en) * | 1987-12-25 | 1994-03-16 | トヨタ自動車株式会社 | FRP molding method |
| JP2005046789A (en) * | 2003-07-31 | 2005-02-24 | Pritec:Kk | Method for resin coating |
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