JPH10290958A - Coating method for blow molding made of polypropylene resin - Google Patents
Coating method for blow molding made of polypropylene resinInfo
- Publication number
- JPH10290958A JPH10290958A JP11877597A JP11877597A JPH10290958A JP H10290958 A JPH10290958 A JP H10290958A JP 11877597 A JP11877597 A JP 11877597A JP 11877597 A JP11877597 A JP 11877597A JP H10290958 A JPH10290958 A JP H10290958A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- blow molding
- coating
- polypropylene resin
- primer
- 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
- 229920005989 resin Polymers 0.000 title claims abstract description 33
- 239000011347 resin Substances 0.000 title claims abstract description 33
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 27
- -1 polypropylene Polymers 0.000 title claims abstract description 20
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 15
- 238000000576 coating method Methods 0.000 title abstract description 32
- 238000000071 blow moulding Methods 0.000 title abstract description 11
- 229920000098 polyolefin Polymers 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 5
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 5
- 229920005862 polyol Polymers 0.000 claims abstract description 5
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 239000003973 paint Substances 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 4
- 229920005672 polyolefin resin Polymers 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 24
- 239000000463 material Substances 0.000 abstract description 14
- IPZIVCLZBFDXTA-UHFFFAOYSA-N ethyl n-prop-2-enoylcarbamate Chemical compound CCOC(=O)NC(=O)C=C IPZIVCLZBFDXTA-UHFFFAOYSA-N 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 150000003077 polyols Chemical class 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000001035 drying Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 229920001971 elastomer Polymers 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 238000006757 chemical reactions by type Methods 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- XVEUJTIZHZIHJM-UHFFFAOYSA-N a828782 Chemical compound CCOC(N)=O.CCOC(N)=O XVEUJTIZHZIHJM-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、汎用グレードのポ
リプロピレン樹脂を用いたブロー成型品の塗装方法に係
り、特に低温高密着タイプのプライマーを用いて上塗り
塗装を行うことにより低温焼付を可能とするポリプロピ
レン樹脂製ブロー成型品の塗装方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a blow-molded article using a general-grade polypropylene resin, and more particularly to a method for applying a top coat using a primer of a low-temperature and high-adhesion type to enable low-temperature baking. The present invention relates to a method for coating a blow molded article made of polypropylene resin.
【０００２】[0002]
【従来の技術】最近、自動車用グリルガードは、安全性
を高めるために従来の金属製のものからポリプロピレン
樹脂（以下、ＰＰ樹脂という）によるブロー成型品へ切
り替えられるようになってきた。一般的に、ＰＰ樹脂の
ブロー成形では、材料をドローする際にパリソンが薄く
なったり落ちたりしないように、インジェクションで用
いられる材料の重量分子量約２０〜３０万に対してブロ
ー材では約６０〜７０万のものが用いられている。この
ように高分子量の比率が大きくなると塗装に関して付着
の足がほとんどなく、また含有ゴム分等塗装性向上成分
をＰ．Ｐ材に含有させたとしても有効成分の表面露出が
不均一であり、部分的に極端に少ない部分が発生してブ
ロー成型品の表面に塗装をするのが極めて困難であっ
た。このため、ＰＰ材の改良や塗料の面で多くの研究が
なされている。2. Description of the Related Art Recently, grill guards for automobiles have been switched from conventional metal-made grill guards to blow-molded articles made of polypropylene resin (hereinafter referred to as PP resin) in order to enhance safety. Generally, in the blow molding of PP resin, the weight and molecular weight of the material used in the injection is about 200,000 to 300,000, while the weight of the blown material is about 60 to 300,000 so that the parison does not become thin or fall when the material is drawn. 700,000 are used. When the ratio of the high molecular weight is increased as described above, there is almost no sticking to the coating, and the coating property improving component such as a rubber component is contained in the P.O. Even if it is contained in the P material, the surface exposure of the active ingredient is non-uniform, and an extremely small portion is partially generated, so that it is extremely difficult to apply the surface of the blow molded product. For this reason, much research has been made on the improvement of PP materials and paints.
【０００３】従来より、プライマーを用いることによっ
てＰＰ樹脂成型品の塗装性を向上させる方法としては、
ポリプロピレン樹脂成型品の塗装方法が提案されてい
る。（特開平５−７８３２号公報） この従来の塗装方法は、ポリプロピレン樹脂成型品の表
面に、塩素化ポリオレフイン樹脂をバインダーとして含
有するプライマーを塗布し、次いでその上にポリオール
化合物とポリイソシアネート化合物とからなる２液反応
型ポリウレタン樹脂塗料を塗布することからなるポリプ
ロピレン樹脂成型品の塗装方法において、該プライマー
とポリウレタン樹脂塗料の両方に、金属化合物であるウ
レタン硬化触媒を含有させるというものである。Conventionally, as a method of improving the coating property of a PP resin molded article by using a primer,
A coating method of a polypropylene resin molded product has been proposed. (JP-A-5-7832) In this conventional coating method, a primer containing a chlorinated polyolefin resin as a binder is applied to the surface of a molded polypropylene resin product, and then a polyol compound and a polyisocyanate compound are formed on the primer. In a method for coating a molded polypropylene resin product, the method comprises applying a two-component reaction type polyurethane resin paint to the primer and the polyurethane resin paint, both of which contain a urethane curing catalyst as a metal compound.
【０００４】また、ＰＰ樹脂製のブロー成型品表面を機
械的にサンディング処理しその後塗装するという方法も
ある。この塗装方法では、サンディングによる樹脂素材
のケバ立ちを抑えるために塗装を２Ｃ１Ｂ（２回塗装１
回乾燥）した後、さらにサンディングして塗装を３Ｃ１
Ｂするようにしている。There is also a method of mechanically sanding the surface of a blow-molded product made of a PP resin and then coating the surface. In this coating method, the coating is performed by 2C1B (two coatings 1
After drying), and further sanding to paint 3C1
B.
【０００５】また、組成物（素材）の改良によりプライ
マーを用いることなくＰＰブロー成型品の塗装性を向上
させるようにしたものでは、メルトフローインデックス
等の性状が規定されたポリプロピレン、ポリエチレンお
よびエチレン−αオレフイン共重合体ゴムを所定比率で
混合することにより、耐ドローダウン性、耐衝撃性等に
優れた大型ブロー成型用ポリオレフイン組成物がある
（特開平３−５９０４９号公報）。また、特定のメルト
インデックスを有するＰＰ系樹脂と高密度ＰＥと、ゴム
状重合体及び無機粉末とを配合することにより、ブロー
成形性、塗装性、塗装後の鏡面性に優れたブロー成型用
樹脂組成物がある（特公平６−５５８６８号公報）。[0005] Further, in a composition in which the coatability of a PP blow-molded article is improved without using a primer by improving the composition (material), polypropylene, polyethylene and ethylene-polyethylene having properties such as a melt flow index are specified. There is a polyolefin composition for large blow molding which is excellent in drawdown resistance, impact resistance and the like by mixing an α-olefin copolymer rubber at a predetermined ratio (JP-A-3-59049). In addition, by blending a PP resin having a specific melt index, high-density PE, a rubbery polymer and an inorganic powder, a blow molding resin having excellent blow moldability, paintability, and mirror finish after painting. There is a composition (JP-B-6-55868).
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、前記の
プライマーを用いるＰＰ樹脂成型品の塗装方法では、イ
ンジェクションによるＰＰ樹脂成型品を対象としてお
り、本発明のようなＰＰ樹脂製のブロー成型品には適用
できないものであった。However, the method for coating a PP resin molded product using the above-mentioned primer is intended for a PP resin molded product by injection. It was not applicable.
【０００７】また、ブロー成型品表面を機械的にサンデ
ィング処理しその後塗装するという方法では、塗装によ
ってもサンディング目を消し切れないため十分に満足で
きる外観品質が得られない。さらに、サンディング時に
サンディング剤などの異物を巻き込み塗装付着性が不安
定となり、１００゜Ｃという高い温度で焼付けをしなけ
ればならないため、高価な乾燥設備を必要とするだけで
なくエネルギーの無駄もあった。Further, in the method of mechanically sanding the surface of the blow-molded article and thereafter coating, the sanding eyes cannot be completely erased by the coating, so that a sufficiently satisfactory appearance quality cannot be obtained. In addition, foreign matter such as a sanding agent is involved during sanding and coating adhesion becomes unstable, and baking must be performed at a temperature as high as 100 ° C., which not only requires expensive drying equipment but also wastes energy. Was.
【０００８】また、特定のメルトインデックスを有する
ＰＰ系樹脂にαオレフイン共重合体ゴムとか、或いは高
密度ＰＥと、ゴム状重合体及び無機粉末とを混ぜ合わせ
たものでは、素材の汎用性がないため材料コストが高く
なるというだけでなく、ブロー成形機も特殊な機械が必
要になるという問題点があった。[0008] In addition, a mixture of a PP resin having a specific melt index with an α-olefin copolymer rubber or a high-density PE, a rubbery polymer and an inorganic powder does not have versatility of the material. Therefore, not only the material cost is increased, but also a blow molding machine requires a special machine.
【０００９】本発明の目的は、樹脂素材をＰ．Ｐとする
ブロー成型品に塗装を行うに際し、低温度で塗装の焼付
乾燥させることができるプライマーを用い、軟質樹脂や
ＡＢＳ樹脂等の塗装乾燥に用いられる、いわゆる低温の
乾燥設備が使用できるようにするものである。[0009] It is an object of the present invention to use a resin material of P.I. When applying to a blow-molded product as P, use a primer that can be baked and dried at a low temperature, so that so-called low-temperature drying equipment used for drying a soft resin or ABS resin can be used. Is what you do.
【００１０】[0010]
【課題を解決するための手段】本発明は、ポリプロピレ
ン樹脂製ブロー成型品の表面に、溶剤によるワイピング
等の処理を施した後、極性基を有する酸変性ポリオレフ
イン及び酸変性塩素化ポリオレフイン樹脂をバインダー
として含有するプライマーを塗布し、次いでその上にポ
リオール化合物とポリイソシアネート化合物とからなる
２液反応型アクリルウレタン樹脂塗料を塗布し、約８０
゜Ｃの温度にて低温焼付乾燥するようにしたことを特徴
とするポリプロピレン樹脂製ブロー成型品の塗装方法で
ある。According to the present invention, a polypropylene resin blow-molded article is subjected to a treatment such as wiping with a solvent, and then a polar group-containing acid-modified polyolefin and an acid-modified chlorinated polyolefin resin are bound to a binder. Is applied, and then a two-component reaction type acrylic urethane resin paint composed of a polyol compound and a polyisocyanate compound is applied thereon.
A method for coating a blow molded article made of polypropylene resin, characterized in that it is baked and dried at a temperature of ゜ C at a low temperature.
【００１１】[0011]
【発明の実施の形態】本発明の前処理は、ポリプロピレ
ン樹脂表面を活性化するために、シリコンオフ（関西ペ
イント製）等の表面改質溶剤を用いてワイピング処理が
行われている。なお、ブロー成形に用いられるＰ．Ｐ樹
脂は、例えば、ＥＸ８８０Ｘ３（出光石油化学社製）と
か、ＮＸ８０１（日本ポリケム社製）の重量分子量が約
６０万〜７０万というもので、これは一般的に用いられ
ているブロー成形用のＰ．Ｐ樹脂材料である。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the pretreatment of the present invention, a wiping treatment is performed using a surface modifying solvent such as silicone off (manufactured by Kansai Paint) to activate the polypropylene resin surface. In addition, the P.I. The P resin is, for example, EX880X3 (manufactured by Idemitsu Petrochemical) or NX801 (manufactured by Nippon Polychem) having a weight molecular weight of about 600,000 to 700,000, which is commonly used for blow molding. P. P resin material.
【００１２】本発明において用いられるプライマーは、
酸変性塩素化ＰＰと、極性基を導入した酸変性ポリオレ
フインとを含有するバインダーを適宜な塗料用有機溶媒
中に溶解し、必要ならば塗料用として慣用されている種
々の添加剤、例えば、顔料または染料等の着色材、充填
材、レベリング材、増粘材が配合されている。このプラ
イマーは、ユニストール（三井石油化学社製）のものを
使用している。The primer used in the present invention is:
A binder containing an acid-modified chlorinated PP and an acid-modified polyolefin into which a polar group has been introduced is dissolved in an appropriate organic solvent for paint, and various additives commonly used for paint, if necessary, for example, pigments Alternatively, a coloring material such as a dye, a filler, a leveling material, and a thickener are blended. The primer used was Unistor (manufactured by Mitsui Petrochemical Co.).
【００１３】２液反応型アクリルウレタン樹脂塗料は、
アクリルポリオールおよびポリエステルポリオール化合
物とポリイソシアネート化合物とからなるもので、汎用
の上塗り塗料（Ｒ２７５／Ｒ２７６（日本ビー．ケミカ
ル社製），（ＳＦＸ４００／ＳＦＸ５００（関西ペイン
ト社製））とし用いられているものである。The two-component reaction type acrylic urethane resin paint is
An acrylic polyol, a polyester polyol compound and a polyisocyanate compound, which are used as general-purpose overcoats (R275 / R276 (manufactured by Nippon Bee Chemical Co., Ltd.), (SFX400 / SFX500 (manufactured by Kansai Paint Co., Ltd.)) It is.
【００１４】本発明による塗装は、２Ｃ１Ｂ（２回塗装
１回乾燥）又は３Ｃ１Ｂ（３回塗装１回乾燥）が行われ
る。この焼付乾燥は、低温乾燥炉で８０゜Ｃ×３０分行
っている。本発明では、このように低温乾燥が行えるた
め、従来工法の１００゜Ｃ又は１２０゜Ｃの乾燥で
は、樹脂の熱収縮が大きく、熱変形の防止や矯正を兼ね
た特殊な塗装治具を必要としたが、本発明の工法では熱
変形がほとんどないため特殊な治具を必要としない。
本発明は低温乾燥のため熱ロスが少なく、従来の工法に
比べてエネルギーが半減できる。In the coating according to the present invention, 2C1B (two coatings and one drying) or 3C1B (three coatings and one drying) is performed. This baking drying is performed in a low-temperature drying oven at 80 ° C. for 30 minutes. In the present invention, since drying at a low temperature can be performed in this manner, in the conventional method of drying at 100 ° C. or 120 ° C., a large heat shrinkage of the resin is required, and a special coating jig that also serves to prevent and correct thermal deformation is required. However, the method of the present invention does not require a special jig because it hardly undergoes thermal deformation.
In the present invention, heat loss is small due to low-temperature drying, and energy can be reduced by half as compared with the conventional method.
【００１５】本発明によるＰ．Ｐ樹脂ブロー成型品の塗
装の評価を行うために下記の評価を行った。 付着性：ＪＩＳＫ−５４００の碁盤目試験を行ったが、
１００個の碁盤目のいづれにもはがれがなく、密着性は
良好であった。 耐ピッチング性：本発明品に厚さ２５μｍのクリア塗装
を施し、３０ｃｍ離れた位置より垂直に支持した塗装面
に対して直角にエアーで石を吹き付け、塗膜のピッチン
グ状態を確認したが、塗膜の剥がれや著しい欠陥がなく
良好なものであった。試験条件としては、石の球径はＪ
ＩＳ Ｚ８８０１−１９６５のフルイメッシュ＃○○に
相当する７．９３〜１１．１ｍｍのものを用い、５０ｇ
／ｓｅｃの割合で総量５００ｇを吹き付けている。な
お、この時のエアー圧は４．０〜４．５ｋｇ／ｃｍ2 、
エアー量は４０〜５０ｌ／ｓｅｃである。 高圧洗車性：本発明品にエレクセンにより切り込みを施
し、水平に支持した塗装面に対して３０゜の傾斜角で３
０ｃｍ離れた位置より高圧洗車機のノズルを用い高圧水
（７０ｋｇｆ／ｃｍｍ2 ）を１分間噴射させ、塗膜の状
態を確認したが、塗膜の剥れは全く見られず良好なもの
であった。 耐候性：ＪＩＳＤ−０２０５促進耐候試験機サンシャイ
ンウェザオメータを用いて８００時間の照射を行った
が、外観に全く異常が見られなかった。According to the present invention, P.I. The following evaluation was performed to evaluate the coating of the P resin blow molded product. Adhesion: A cross-cut test according to JIS K-5400 was performed.
No peeling was observed on any of the 100 grids, and the adhesion was good. Pitching resistance: A clear coating having a thickness of 25 μm was applied to the product of the present invention, and a stone was blown with air at right angles to a coating surface vertically supported from a position 30 cm away, and the pitting state of the coating film was confirmed. The film was good with no peeling of the film or significant defects. The test conditions are as follows:
Use 7.93 to 11.1 mm, which is equivalent to Flumesh # ○○ of IS Z8801-1965, and 50 g
/ G is sprayed at a rate of / sec. The air pressure at this time was 4.0 to 4.5 kg / cm 2 ,
The amount of air is 40 to 50 l / sec. High-pressure car washability: The product of the present invention was cut with Elexen and inclined at an angle of 30 ° with respect to the horizontally supported painted surface.
From a position 0 cm away, high pressure water (70 kgf / cmm 2 ) was sprayed for 1 minute using a nozzle of a high pressure car washer to check the state of the coating film. Was. Weathering resistance: Irradiation was performed for 800 hours using a sunshine weatherometer according to JISD-0205 accelerated weathering tester, but no abnormality was observed in appearance.
【００１６】[0016]
【発明の効果】本発明は、樹脂素材をＰ．Ｐとするブロ
ー成型品に塗装を行うに際し、通常の簡単な前処理を施
し、その上に、酸変性塩素化ＰＰと、極性基として酸変
性ポリオレフインとを含有するバインダーを適宜な塗料
用有機溶媒中に溶解してなるプライマーを塗布し、上塗
り塗装としては通常の２液反応型アクリルウレタン樹脂
塗料を用い、低温乾燥炉にて塗料を乾燥することができ
るため、従来の工法に比べて塗装品に変形を生じさせる
ことがなく、さらに乾燥のためのエネルギーを大幅に節
減することができる。According to the present invention, the resin material is made of P.O. When performing coating on a blow-molded product as P, a usual simple pretreatment is performed, and a binder containing acid-modified chlorinated PP and an acid-modified polyolefin as a polar group is further applied to an appropriate organic solvent for coating. The primer is applied by dissolving it inside, and a normal two-pack reaction type urethane urethane resin paint is used as the top coat, and the paint can be dried in a low-temperature drying oven. Thus, the energy for drying can be greatly reduced without causing any deformation.
Claims (1)
に、溶剤によるワイピング等の処理を施した後、極性基
を有する酸変性ポリオレフイン及び酸変性塩素化ポリオ
レフイン樹脂をバインダーとして含有するプライマーを
塗布し、次いでその上にポリオール化合物とポリイソシ
アネート化合物とからなる２液反応型アクリルウレタン
樹脂塗料を塗布し、約８０゜Ｃの温度にて低温焼付乾燥
するようにしたことを特徴とするポリプロピレン樹脂製
ブロー成型品の塗装方法。After applying a treatment such as wiping with a solvent to the surface of a blow molded article made of a polypropylene resin, a primer containing an acid-modified polyolefin having a polar group and an acid-modified chlorinated polyolefin resin as a binder is applied, Then, a two-component reactive urethane resin paint composed of a polyol compound and a polyisocyanate compound is applied thereon, and is baked and dried at a temperature of about 80 ° C. at a low temperature. How to paint the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11877597A JPH10290958A (en) | 1997-04-21 | 1997-04-21 | Coating method for blow molding made of polypropylene resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11877597A JPH10290958A (en) | 1997-04-21 | 1997-04-21 | Coating method for blow molding made of polypropylene resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10290958A true JPH10290958A (en) | 1998-11-04 |
Family
ID=14744777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11877597A Pending JPH10290958A (en) | 1997-04-21 | 1997-04-21 | Coating method for blow molding made of polypropylene resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10290958A (en) |
-
1997
- 1997-04-21 JP JP11877597A patent/JPH10290958A/en active Pending
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