JPS59160572A - Local chip resistance painting film of car body of automobile - Google Patents

Abstract

PURPOSE:To improve a chip resistance by placing a power or a painting film by a slurry painting between an electrodeposition painting film and an intermediate painting film. CONSTITUTION:A body which is degreased and chemically treated is brought to an electrodeposition painting, and therefore, washed with water, and by utilizing a small space before reaching a baking furnace, a powder paint or a slurry paint is blown to the hood tip and the front end panel so that a film thickness 8 after heating and hardening becomes 100-200mu. Thereafter, an intermediate painting film 9 and a finished painting film 10 are formed. In this way, the smoothness and chipping resistance are improved.

Description

【発明の詳細な説明】 本発明は自動車車体の耐チツプ性能が要求される部位に
おける局部耐チツプ塗膜に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a localized chip-resistant coating film for parts of an automobile body where chip-resistant performance is required.

自動車の走行中には路面の小石や砂利が車体にはねかえ
って塗膜を傷つ・けるので、このような小石や砂利が当
シやすく外観に平滑性を殆んど必要としない部分、例え
ばバランスパネルやロッカーパネル等には耐チツプ塗料
を使用して来た。While the car is running, pebbles and gravel from the road bounce off the car body and damage the paint film. Chip-resistant paint has been used for balance panels, rocker panels, etc.

耐チツプ塗料とは例えば、ポリ塩化ビニルのプラスチゾ
ルに炭酸カルシウムを加えたものや、二液性ポリウレタ
ン等、粘性が高くて厚い塗膜を得やすいものが使用され
る。しかるに第１図に示すスラントノーズ型のフード先
端１ヤフロントエンドパネル２、更にはクォーターやド
アの下部等は先行車の弾きとばす小石や砂利が当シやす
くチツピングダメジが著しい。一方でこのような部位の
塗膜は平滑性も重視されるので上記のような耐チツプ塗
料を使用することができず、やむなく使用して中塗シ、
上塗りでカバーしても平滑な塗膜を得にくいという問題
がある。The chip-resistant paint used is, for example, a polyvinyl chloride plastisol with calcium carbonate added thereto, or a two-component polyurethane, which has high viscosity and can easily form a thick coating. However, the tip of the slant-nose type hood shown in Figure 1, the front end panel 2, the quarters, and the lower part of the doors are easily hit by pebbles and gravel thrown by the vehicle in front, resulting in significant chipping damage. On the other hand, since smoothness is important for the coating film in such areas, it is not possible to use the above-mentioned chip-resistant paints, so we have no choice but to use intermediate coatings.
There is a problem in that it is difficult to obtain a smooth coating even if covered with a top coat.

一方、既存の溶剤型塗料を主体とした自動車塗装のシス
テム範囲では、タレやワキの問題から５０μ以上の塗膜
は得られず、耐チップ性を満足する程の厚塗りは不可能
である。On the other hand, with existing automotive coating systems that mainly use solvent-based paints, it is not possible to obtain a coating film with a thickness of more than 50 μm due to problems with sagging and undercoating, and it is impossible to apply a coating thick enough to satisfy chip resistance.

本発明は自動車車体のスラントノーズ部分等の外観を損
うことなく耐チップ性を向上せしめることのできるよう
な構造を有する局部耐チツプ塗膜の提供を目的とするも
のである。The object of the present invention is to provide a localized chip-resistant coating film having a structure that can improve chip resistance without damaging the appearance of the slant nose portion of an automobile body.

即ち本発明の局部耐チツプ塗膜は被塗装物基材の上に、
電着塗膜、粉体またはスラリー塗料の熱硬化塗膜、中塗
り塗膜及び上塗シ塗膜の順で塗り重ねられてなシ、上記
の粉体またはスラリー″塗料よシの熱硬化塗膜が１００
ないし２００μの厚みを有することを特徴とするもので
ある。That is, the local chip-resistant coating film of the present invention is applied on the base material of the object to be coated.
Electrodeposition coatings, thermosetting coatings made of powder or slurry paints, intermediate coatings, and top coatings, which are not coated in this order, and thermosetting coatings made from the above powder or slurry paints. is 100
It is characterized by having a thickness of 200 μm to 200 μm.

車体工場で製作された自動車ボディーは通常の脱脂・化
成処理後、例えばエポキシ樹脂系カチオン塗料で下塗り
電着塗装され、続いてシーラー塗布、防錆処理及び防音
処理を行なった後、ポリエステル中塗り塗料を外板面に
吹きつけられる。次ニエンジンルーム内、トランクルー
ム内及びフューエルインレット内に近似ボデー色のポリ
エステル樹脂系上塗シ塗料を吹きつけ、焼付は乾燥する
。しかる後ボデー表面を水研ぎして塗装前処理を終シ、
塗装ブース内の上塗シ塗装に入る。Automobile bodies manufactured at auto body shops are subjected to normal degreasing and chemical conversion treatment, and are then electrocoated with an undercoat of, for example, cationic epoxy resin paint, followed by sealer application, rust prevention treatment, and soundproofing treatment, followed by polyester undercoat paint. can be sprayed onto the outer panel surface. Next, spray a polyester resin topcoat paint in a similar body color to the interior of the second engine compartment, trunk compartment, and fuel inlet, and let it dry. After that, the surface of the body is wet-sanded to complete the pre-painting treatment.
Start painting the top coat in the paint booth.

本発明の塗膜は上記の電着塗装と中塗り塗装との間に熱
硬化性樹脂の粉体塗料またはスラリー塗料を吹きつけた
後、加熱硬化して得られるものであり該中間塗膜の厚さ
は１００ないし２００μ、好ましくは１０口ないし１５
０μである。１００μ以下では耐チップ性が十分でなく
２００μ以上は塗着性及び効率の点で限界がある。The coating film of the present invention is obtained by spraying a thermosetting resin powder coating or slurry coating between the electrodeposition coating and the intermediate coating, and then heating and curing the coating. The thickness is 100 to 200 μ, preferably 10 to 15
It is 0μ. If it is less than 100μ, the chip resistance is insufficient, and if it is more than 200μ, there is a limit in terms of adhesion and efficiency.

本発明塗膜の形成に用いられるカチオン性樹脂水溶液に
特に制限はないがエポキシ樹脂、アミノアクリル樹脂、
ポリアミド樹脂等の塩基性合成樹脂を乳酸、プロピオン
酸、蟻酸、酢酸等の酸性化合物で部分的に中和した水溶
液が適当である。また熱硬化性粉体塗料としては、一般
の粉体塗料として使用できるエポキシ系、ポリエステル
系、ポリウレタン系、エポキシ−アクリル系の樹脂及び
硬化剤の混合物であり、必要に応じて各種の添加物を加
えることができる。The cationic resin aqueous solution used to form the coating film of the present invention is not particularly limited, but includes epoxy resins, aminoacrylic resins,
An aqueous solution obtained by partially neutralizing a basic synthetic resin such as a polyamide resin with an acidic compound such as lactic acid, propionic acid, formic acid, or acetic acid is suitable. Thermosetting powder coatings are mixtures of epoxy, polyester, polyurethane, and epoxy-acrylic resins and curing agents that can be used as general powder coatings, and various additives may be added as necessary. can be added.

以下、本発明の実施例を図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.

実施例 第１図は本発明の塗膜を得る工程を示し脱脂・化成処理
されたボデーが電着槽３で電着塗装される。電着塗料は
次のようにして調整される。Embodiment FIG. 1 shows the process of obtaining the coating film of the present invention, in which a body that has been degreased and chemically treated is electrodeposited in an electrodeposition bath 3. The electrodeposition paint is prepared as follows.

即チ、エホキシ樹脂１００部、ジェタノールアミン１５
部、イソプロピルアミン３０部を８０’Ｃで５時間、還
流下に反応させ液状のアミノエポキン樹脂を得る。次に
この樹脂液を氷醋酸で中和し、脱イオン水を加えて固形
分２０チのカチオン性樹脂水溶液とする。Sokuchi, 100 parts of epoxy resin, 15 parts of jetanolamine
1 part and 30 parts of isopropylamine were reacted at 80'C for 5 hours under reflux to obtain a liquid aminoepochine resin. Next, this resin liquid is neutralized with glacial acetic acid, and deionized water is added to prepare a cationic resin aqueous solution having a solid content of 20 inches.

電着塗装後、水洗し、従来ならば焼付炉４を通って直ち
に焼付硬化させるのであるが、本発明の塗膜を得るには
焼付炉４に至る間の僅かの空間を利用して粉体塗料５ま
たはスラリー塗料をフード先端１及びフロントエンドパ
ネル２に、加熱硬化後の膜厚が１００ないし２００μと
なるように吹きつける。なお粉体塗料５の組成の一例は
次の通シである。After electrodeposition coating, it is washed with water and, conventionally, it is immediately baked and hardened through a baking oven 4, but in order to obtain the coating film of the present invention, the powder is Paint 5 or slurry paint is sprayed onto the hood tip 1 and front end panel 2 so that the film thickness after heating and curing is 100 to 200 μm. An example of the composition of the powder coating 5 is as follows.

ポリ、エステル樹脂　　　２０部 エポキシ樹脂　　　　　８０〃 表面調整剤　　　　　　　１〃 酸化チタン　　　　　　５０〃 カーボンブラック　　　　１〃 次に焼付炉４にて１８０ないし２００°に２０分間保ち
、上記の塗装部位を未硬化の電着塗装部位と同時に加熱
硬化させ、その後は所定の中塗シ、上塗少工程に移され
る。なお背定の塗装部位に粉体またはスラリー塗装する
際には、電着時のボデー付着水分の影響をさけるため当
部位のみに加熱空気を吹付は水切りをすると塗膜中の発
泡を防止することができる。Polyester resin 20 parts Epoxy resin 80〃 Surface conditioner 1〃 Titanium oxide 50〃 Carbon black 1〃 Next, keep it at 180 to 200° for 20 minutes in baking oven 4, and apply uncured electrodeposition coating to the above-mentioned painted area. The area is heated and cured at the same time, and then the predetermined intermediate coating and top coating processes are carried out. In addition, when applying powder or slurry coating to an area to be painted, spray heated air only on that area and drain the water to avoid foaming in the coating to avoid the effects of moisture adhering to the body during electrodeposition. Can be done.

このようにして得られた塗膜は第２図に示す如く基材６
の上の電着塗膜７、粉体塗料塗膜８、中塗り塗膜９、上
塗シ塗膜１０よシ構成され、綜合で１５０ないし２５０
μの膜厚となシ、しかも平滑で第２図に示すように膜厚
が連続的に変化し、外見上、段違い等の不具合がみられ
ない。また粉体塗料塗膜８の厚みを変えて耐チップ性を
試験した結果、本発明の範囲内では従来の耐チツプ塗料
に勝る結果を示した。次にその試験方法と結果を示す。The coating film thus obtained is coated on the base material 6 as shown in FIG.
It is composed of an electrodeposition coating film 7, a powder coating film 8, an intermediate coating film 9, and a top coating film 10, with a total coating thickness of 150 to 250.
It has a film thickness of μ, and is smooth, and the film thickness changes continuously as shown in FIG. 2, and there are no visible defects such as unevenness. Further, as a result of testing the chip resistance by varying the thickness of the powder coating film 8, results were shown to be superior to conventional chip resistant paints within the scope of the present invention. Next, the test method and results are shown.

■　グラベロテスト 外径約３〜５２１１１１＋の御影石の破砕粒子１Ｋｇを
上塗り済みの塗装面１００ｄに圧力５　％（Ｐ）の空気
を利用して吹きつけた後、塩水噴霧試験を２４０時間実
施してその後の錆状況をレーティングＮｏ表示で示す。■ Gravelo test After spraying 1 kg of crushed granite particles with an outer diameter of approximately 3 to 521111+ onto 100 d of the top-coated painted surface using air at a pressure of 5% (P), a salt water spray test was conducted for 240 hours. The rust condition is indicated by the rating number.

■　ナツトテスト ２４０時間の温水浸漬を施こし劣化させた塗装パネルを
約４５度傾斜させ、そのうえ約１．５ｍの高さからナツ
トを連続的に落下させ、鉄素地があられれだ時点のナツ
ト重量を示す。■ Nut test A painted panel that had been immersed in hot water for 240 hours and deteriorated was tilted at an angle of approximately 45 degrees, and then the nuts were continuously dropped from a height of approximately 1.5 m. show.

※ニレーティングＮＯＡＳＴＭ規格による。*Based on Nirating NOASTM standard.

「１０」は全く素地に傷がなく錆なしの状態を示す。"10" indicates that there is no scratch on the base material and no rust.

上記の如く本発明の塗膜は電着塗膜と中塗シ塗膜との間
に粉体またはスラリー塗装による塗膜を挾んだことによ
シ平滑性と耐チツビーング性とを兼ね具えることができ
ること＼なシ、且つ、既存の塗装ラインを大巾に変更す
ることなく、電着塗装設備と中塗シ塗装設備の間の僅か
な空間を利用することによシ最少限の塗装設備とコスト
で足りるので製品の品質向上効果が大きい。As mentioned above, the coating film of the present invention has both smoothness and chipping resistance by sandwiching a powder or slurry coating between the electrodeposition coating and the intermediate coating. It is possible to use the small space between the electrodeposition coating equipment and the intermediate coating equipment without making major changes to the existing painting line, thereby minimizing painting equipment and costs. Since it is sufficient, the effect of improving the quality of the product is large.

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

第１図は本発明の塗膜を得るだめの工程図を表わし、 第２図は本発明塗膜の断面図を表わす。 図中、 FIG. 1 shows a process diagram for obtaining the coating film of the present invention, FIG. 2 represents a cross-sectional view of the coating film of the present invention. In the figure,

Claims (1)

【特許請求の範囲】[Claims] 被塗装物基材の上に、電着塗膜、粉末まだはスラリー塗
料の熱硬化塗膜、中塗シ塗膜及び上塗り塗膜の順で塗り
重ねられてなシ、上記の粉体またはスラリー塗料よりの
熱硬化塗膜が１００ないし２００μの厚みを有すること
を特徴とする自動車車体の局部耐チツプ塗膜。The above-mentioned powder or slurry paint is coated on the base material of the object to be coated in the following order: electrodeposition coating, thermosetting coating of powder or slurry coating, intermediate coating, and top coating. A local chip-resistant coating film for an automobile body, characterized in that the thermosetting coating film has a thickness of 100 to 200μ.