JP2006290157A - Molding member for automobile - Google Patents
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- JP2006290157A JP2006290157A JP2005113504A JP2005113504A JP2006290157A JP 2006290157 A JP2006290157 A JP 2006290157A JP 2005113504 A JP2005113504 A JP 2005113504A JP 2005113504 A JP2005113504 A JP 2005113504A JP 2006290157 A JP2006290157 A JP 2006290157A
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Abstract
Description
本発明は、優れた密着性、耐食性を有する自動車用モールディング部材に関する。 The present invention relates to an automotive molding member having excellent adhesion and corrosion resistance.
ベルトモール、ウインドウモール、サイドモール、ピラー等の自動車用モールディング部材は、ステンレス鋼などの耐食性に優れた長尺金属材を芯材に使用し、複合押出成形法で最外層用樹脂をモールディング芯材に接合している。最外樹脂層には、押出成形性に優れたポリ塩化ビニル樹脂が使用されているが、環境負荷の大きなポリ塩化ビニル樹脂に代えてポリオレフィン樹脂も使用され始めている（特許文献１）。
自動車モールディング芯材に、ステンレス鋼などの高耐食性金属材が使用されてきた理由は、切断端面部の腐食を抑制するためである。しかしながら、自動車用モールディング部材に占めるモールディング芯材の材料コストは高く、モールディング部材を全てプラスチックで成型する方法なども検討されたが、強度不足や耐候性低下などの面から従来材からの代替はなされていない。 The reason why a high corrosion resistance metal material such as stainless steel has been used for the automobile molding core material is to suppress the corrosion of the cut end surface portion. However, the material cost of the molding core material in the molding materials for automobiles is high, and methods such as molding all molding materials with plastics have been studied, but replacement from conventional materials has been made in terms of insufficient strength and reduced weather resistance. Not.
本発明は、このような問題を解決すべく案出されたものであり、モールディング芯材として、切断端面部の耐食性に優れるＺｎ−Ａｌ−Ｍｇ合金めっき鋼板を用いた低コストの自動車用モールディング部材を提供することを目的とする。 The present invention has been devised to solve such a problem, and a low-cost automotive molding member using a Zn-Al-Mg alloy-plated steel sheet having excellent corrosion resistance at the cut end face as a molding core material. The purpose is to provide.
本発明の自動車モールディング部材は、その目的を達成するため、Ａｌ：４〜１０質量％、Ｍｇ：１〜４質量％を含み、Ａｌ／Ｚｎ／Ｚｎ２Ｍｇの三元共晶組織のマトリックスに初晶Ａｌ相又は初晶Ａｌ相およびＺｎ単層が混在しているＺｎ−Ａｌ−Ｍｇめっき層が形成された鋼板表面に、カルシウムシリケートおよび、もしくはリン酸化合物を含有するエポキシ樹脂からなる下塗り層を設け、さらに、エポキシ樹脂および最外層の樹脂層に相溶性を示し、かつ、顔料を含まない接着剤層を設けて、該接着剤層を介して最外樹脂層を形成したことを特徴とする。Ｚｎ−Ａｌ−Ｍｇめっき層がさらにＴｉ：０．００２〜０．１質量％、Ｂ：０．００１〜０．４５質量％の１方または両方を含むことができる。接着剤と最外樹脂層は相溶性の高い組合せで選定され、接着剤層がアクリル樹脂とエポキシ樹脂の混合物からなるとき、最外樹脂層がポリ塩化ビニル樹脂からなる。接着剤層が酸変性ポリオレフィン樹脂からなるとき、最外樹脂層がポリプロピレン樹脂からなる。 In order to achieve the object, the automotive molding member of the present invention contains Al: 4 to 10% by mass, Mg: 1 to 4% by mass, and is the first in the matrix of Al / Zn / Zn 2 Mg ternary eutectic structure. An undercoat layer made of an epoxy resin containing calcium silicate and / or a phosphoric acid compound is formed on the surface of a steel sheet on which a Zn-Al-Mg plating layer in which a crystalline Al phase or primary Al phase and a Zn single layer are mixed is formed. And an adhesive layer that is compatible with the epoxy resin and the outermost resin layer and does not contain a pigment, and the outermost resin layer is formed through the adhesive layer. . The Zn—Al—Mg plating layer may further contain one or both of Ti: 0.002 to 0.1 mass% and B: 0.001 to 0.45 mass%. The adhesive and the outermost resin layer are selected in a highly compatible combination. When the adhesive layer is made of a mixture of an acrylic resin and an epoxy resin, the outermost resin layer is made of a polyvinyl chloride resin. When the adhesive layer is made of an acid-modified polyolefin resin, the outermost resin layer is made of a polypropylene resin.
本発明において、モールディング芯材として、Ａｌ：４〜１０質量％、Ｍｇ：１〜４質量％を含み、Ａｌ／Ｚｎ／Ｚｎ２Ｍｇの三元共晶組織のマトリックスに初晶Ａｌ相又は初晶Ａｌ相およびＺｎ単層が混在しているＺｎ−Ａｌ−Ｍｇめっき層が形成された鋼板を使用する。Ｚｎ−Ａｌ−Ｍｇ合金めっき鋼板は、めっき層に含まれるＡｌ、Ｍｇが緻密で難溶性の腐食生成物となり、めっき層表面を覆うため高耐食性を有する特徴がある。任意成分として添加されるＴｉ、Ｂは、塗装後の表面外観や耐食性に悪影響を及ぼすＺｎ１１Ｍｇ２相の晶出を抑制する作用を呈する。 In the present invention, as a molding core material, Al: 4 to 10% by mass, Mg: 1 to 4% by mass, and a primary Al phase or primary crystal in a matrix of Al / Zn / Zn 2 Mg ternary eutectic structure A steel sheet having a Zn—Al—Mg plating layer in which an Al phase and a Zn single layer are mixed is used. The Zn—Al—Mg alloy-plated steel sheet is characterized by high corrosion resistance because Al and Mg contained in the plating layer become dense and hardly soluble corrosion products and cover the surface of the plating layer. Ti and B added as optional components exhibit an action of suppressing crystallization of the Zn 11 Mg 2 phase, which adversely affects the surface appearance and corrosion resistance after coating.
本発明のモールディング部材の切断端面部で腐食が起きた場合、Ｚｎ−Ａｌ−Ｍｇ合金めっき鋼板と下塗り層との界面に前述の難溶性腐食生成物が生じる。ここで、下塗り層および接着剤を介して被覆された最外樹脂層は、ポリ塩化ビニル樹脂やポリプロピレン樹脂であり、一般的な塗料を塗装したプレコート鋼板の塗膜厚に比べて格段に厚い。一般的なプレコート鋼板の乾燥膜厚が数十μｍであるのに対して本発明の最外樹脂層の乾燥膜厚は、平均厚さ０．５ｍｍ、最も厚い部位で１ｍｍを越える。 When corrosion occurs at the cut end surface portion of the molding member of the present invention, the above-mentioned hardly soluble corrosion product is generated at the interface between the Zn-Al-Mg alloy-plated steel sheet and the undercoat layer. Here, the outermost resin layer coated with the undercoat layer and the adhesive is a polyvinyl chloride resin or a polypropylene resin, and is much thicker than the coating film thickness of a pre-coated steel plate coated with a general paint. While the dry film thickness of a general pre-coated steel sheet is several tens of μm, the dry film thickness of the outermost resin layer of the present invention is an average thickness of 0.5 mm and exceeds 1 mm at the thickest part.
この最外樹脂層の厚さが、該樹脂層の力学的変形を起こりにくくし、接着剤層および下塗り層を介して腐食生成物の体積膨張、すなわち、腐食進行を抑制する作用として働く。ここで、接着剤層中に顔料を含まないことから、接着剤と最外樹脂層との接着がより緻密になり、界面接着力を増大して、最外樹脂層からの腐食進行抑制を高める。また、下塗り層がＺｎ−Ａｌ−Ｍｇ合金めっき鋼板への接着性に優れたエポキシ樹脂からなり、カルシウムシリケートおよび、もしくはリン酸化合物を含有することにより、Ｚｎ−Ａｌ−Ｍｇ合金めっき鋼板と下塗り層との界面での難溶性腐食生成物の成長を、さらに抑制することができる。また、Ｚｎ−Ａｌ−Ｍｇ合金めっき鋼板と下塗り層との界面に生じるわずかな腐食生成物は該界面をを緻密に閉塞する作用を示し、外部から侵入してくる腐食性イオンの内部への進入を阻止し、切断端面部での腐食がその部位に留まる。 The thickness of the outermost resin layer makes it difficult for mechanical deformation of the resin layer, and acts as an action of suppressing the volume expansion of the corrosion product, that is, the progress of corrosion through the adhesive layer and the undercoat layer. Here, since the pigment is not contained in the adhesive layer, the adhesion between the adhesive and the outermost resin layer becomes denser, the interfacial adhesive force is increased, and the progress of corrosion progression from the outermost resin layer is enhanced. . The undercoat layer is made of an epoxy resin excellent in adhesion to a Zn-Al-Mg alloy-plated steel sheet, and contains a calcium silicate and / or a phosphoric acid compound, so that the Zn-Al-Mg alloy-plated steel sheet and the undercoat layer It is possible to further suppress the growth of the hardly soluble corrosion product at the interface. In addition, slight corrosion products generated at the interface between the Zn-Al-Mg alloy-plated steel sheet and the undercoat layer close the interface precisely, and corrosive ions entering from the outside enter the interior. The corrosion at the cut end face remains at the site.
本発明のモールディング芯材は、Ａｌ／Ｚｎ／Ｚｎ２Ｍｇの三元共晶組織のマトリックスに初晶Ａｌ相または初晶Ａｌ相およびＺｎ単層が混在しているＺｎ−Ａｌ−Ｍｇめっき層が形成された鋼板を使用する。かかる組織のめっき層を形成するため、Ａｌ、Ｍｇ含有量をそれぞれ４〜１０質量％、１〜４質量％に調整する。Ｚｎ−Ａｌ−Ｍｇ合金めっき鋼板に接着剤を塗布する前に、脱脂、表面調整、化成処理等の塗装前処理が施される。化成処理には、リン酸塩処理、チタン系、ジルコニウム系、シリカ系等の化成皮膜を形成する非クロメート系処理が適用できる。 The molding core material of the present invention has a Zn—Al—Mg plating layer in which an Al / Zn / Zn 2 Mg ternary eutectic structure matrix is mixed with primary Al phase or primary Al phase and Zn single layer. Use formed steel plate. In order to form a plating layer having such a structure, the contents of Al and Mg are adjusted to 4 to 10% by mass and 1 to 4% by mass, respectively. Before applying the adhesive to the Zn—Al—Mg alloy plated steel sheet, pre-coating treatments such as degreasing, surface adjustment, and chemical conversion treatment are performed. For the chemical conversion treatment, non-chromate treatment for forming a chemical conversion coating such as phosphate treatment, titanium-based, zirconium-based, or silica-based can be applied.
下塗り層には、カルシウムシリケートおよび、もしくはリン酸化合物を含有するエポキシ樹脂を用いる。カルシウムシリケートは変性シリカとも称され、Ｃａイオンをイオン交換で結合させた多孔質シリカであり、Ｈイオン等の腐食性イオンをＣａイオンで捕捉することにより、下地鋼板の非クロム系化成処理皮膜と相俟って、従来のクロム系防錆顔料を凌駕する腐食防止機能を呈する。リン酸化合物としては、ピロリン酸アルミニウム、メタリン酸アルミニウム、トリポリリン酸アルミニウム等のポリリン酸塩が用いられる。カルシウムシリケート、リン酸化合物はそれぞれ単独でも高い防食作用を示すが、併用することでさらに耐食性は向上する。 For the undercoat layer, an epoxy resin containing calcium silicate and / or a phosphoric acid compound is used. Calcium silicate, also called modified silica, is porous silica in which Ca ions are bonded by ion exchange. By capturing corrosive ions such as H ions with Ca ions, Together, it exhibits a corrosion prevention function that surpasses conventional chromium anticorrosive pigments. As the phosphoric acid compound, polyphosphates such as aluminum pyrophosphate, aluminum metaphosphate, and aluminum tripolyphosphate are used. Calcium silicate and phosphoric acid compound each show a high anticorrosion effect even when used alone, but the combined use improves the corrosion resistance.
接着剤層は、最外樹脂層との関連で樹脂種が選定される。ポリ塩化ビニル樹脂を最外樹脂層とする場合、アクリル樹脂とエポキシ樹脂の混合物が接着剤に適用される。アクリル樹脂がポリ塩化ビニル樹脂と高い相溶性を示し、エポキシ樹脂からなる下塗り層には当然エポキシ樹脂が強い密着性を呈する。アクリル樹脂には、メチル、エチル、イソブチル、ｎ−ブチル等のアクリルまたはメタクリル酸エステルモノマーからなる単独重合体または共重合体が挙げられ、ポリエステル、ウレタン等で変性したアクリル樹脂も使用できる。エポキシ樹脂には、ビスフェノールＡ、ＦまたはＡＤ型、ノボラック型、グリシジルアミン型、グリシジルエステル型、脂環式、鎖状型等の各種エポキシ樹脂が使用される。アクリル樹脂とエポキシ樹脂の配合割合は、アクリル樹脂／エポキシ樹脂の質量比として、５／９５〜９０／１０が好ましく、この範囲を外れると、接着剤側か下地原板側の一方のどちらかとの結びつきが強くなり、密着性のバランスが保てない。 The resin layer is selected for the adhesive layer in relation to the outermost resin layer. When polyvinyl chloride resin is used as the outermost resin layer, a mixture of acrylic resin and epoxy resin is applied to the adhesive. The acrylic resin is highly compatible with the polyvinyl chloride resin, and the epoxy resin naturally exhibits strong adhesion to the undercoat layer made of the epoxy resin. Examples of the acrylic resin include homopolymers or copolymers composed of acrylic or methacrylic acid ester monomers such as methyl, ethyl, isobutyl, and n-butyl. An acrylic resin modified with polyester, urethane, or the like can also be used. As the epoxy resin, various epoxy resins such as bisphenol A, F or AD type, novolac type, glycidylamine type, glycidyl ester type, alicyclic type, and chain type are used. The mixing ratio of the acrylic resin and the epoxy resin is preferably 5/95 to 90/10 as the mass ratio of the acrylic resin / epoxy resin, and if it is out of this range, it is associated with either the adhesive side or the base substrate side. Becomes stronger and the balance of adhesion cannot be maintained.
ポリプロピレン樹脂を最外樹脂層とする場合、酸変性ポリオレフィン樹脂が好適な接着剤である。酸変性ポリオレフィン樹脂は、下地の塗装原板とポリプロピレン樹脂の双方に十分な相溶性、密着性を示す。酸変性ポリオレフィン樹脂には、ポリエチレン、ポリプロピレン、エチレン−プロピレン共重合体、エチレン−酢酸ビニル共重合体等のポリオレフィン樹脂に、無水マレイン酸等のエチレン性不飽和基を有する酸無水物をグラフト重合した変性体や、エチレン−アクリル酸共重合体、エチレン−メタクリル酸共重合体等のオレフィンとエチレン性不飽和基を有するカルボン酸との共重合体等を単独または混合体として使用する。 When polypropylene resin is used as the outermost resin layer, an acid-modified polyolefin resin is a suitable adhesive. The acid-modified polyolefin resin exhibits sufficient compatibility and adhesion to both the base coating original plate and the polypropylene resin. The acid-modified polyolefin resin was graft polymerized with an acid anhydride having an ethylenically unsaturated group such as maleic anhydride on a polyolefin resin such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc. A modified body, a copolymer of an olefin such as an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, and a carboxylic acid having an ethylenically unsaturated group is used alone or as a mixture.
接着剤層には、クロムフリー防錆顔料や体質顔料等の各種顔料を含まない樹脂層を適用する。接着剤層中に顔料を含まないことで、接着剤層と最外樹脂層との接着がより緻密となり、界面接着力が増大して、最外樹脂層による腐食進行抑制を高める効果がある。 A resin layer that does not contain various pigments such as chromium-free rust preventive pigments and extender pigments is applied to the adhesive layer. By not containing a pigment in the adhesive layer, the adhesion between the adhesive layer and the outermost resin layer becomes denser, the interfacial adhesive force is increased, and there is an effect of increasing the corrosion progress suppression by the outermost resin layer.
モールディング部材の製造に際しては、表面を清浄したＺｎ−Ａｌ−Ｍｇ合金めっき鋼板に、ロールコート、スプレーコート、ダイコート、カーテンフローコート等で、下塗り塗料を塗布し、１５０〜２５０℃の焼付け乾燥にて下塗り塗膜層を設ける。下塗り塗料の塗布量は、下塗り塗膜層の乾燥膜厚が２〜２０μｍとなるように調整する。乾燥膜厚２μｍ以上で必要な耐食性と接着力を発現する。乾燥膜厚として２０μｍを越えても優れた耐食性と接着力を有するもののコストメリットがない。次いで、接着剤を塗布し、１５０〜２５０℃の焼付け乾燥にて接着剤層を設ける。接着剤の塗布量は、接着剤層の乾燥膜厚が２〜２０μｍとなるように調整する。乾燥膜厚２μｍ以上で必要な接着力を発現する。乾燥膜厚として２０μｍを越えても優れた接着力を有するもののコストメリットがない。 In the production of the molding member, a primer coating is applied to the Zn-Al-Mg alloy-plated steel sheet with a clean surface by roll coating, spray coating, die coating, curtain flow coating, etc., followed by baking and drying at 150 to 250 ° C. An undercoat coating layer is provided. The application amount of the undercoat paint is adjusted so that the dry film thickness of the undercoat paint film layer is 2 to 20 μm. Necessary corrosion resistance and adhesive strength are exhibited at a dry film thickness of 2 μm or more. Even if the dry film thickness exceeds 20 μm, there is no cost merit although it has excellent corrosion resistance and adhesive strength. Next, an adhesive is applied, and an adhesive layer is provided by baking and drying at 150 to 250 ° C. The application amount of the adhesive is adjusted so that the dry film thickness of the adhesive layer is 2 to 20 μm. Necessary adhesive force is expressed at a dry film thickness of 2 μm or more. Even if the dry film thickness exceeds 20 μm, there is no cost merit although it has excellent adhesion.
下塗り塗膜層および接着剤層が設けられたＺｎ−Ａｌ−Ｍｇ合金めっき鋼板は、ロールフォーミング、プレス加工等で所定のモールディング形状に加工される。下塗り塗膜層および接着剤層は、成形加工時に下地鋼板の塑性変形に追従し、均一な皮膜としてモールディング芯材の表面に存在する。下塗り塗膜層および接着剤層に多少の加工欠陥があっても、最外樹脂層を接合する複合押出成形工程で、接着剤層が最外層の樹脂層に相溶一体化されるので、加工欠陥は解消し、加えて、下塗り塗膜層のカルシウムシリケートおよび、もしくはリン酸化合物が加工欠陥由来の下地腐食を抑制する。 A Zn—Al—Mg alloy-plated steel sheet provided with an undercoat coating layer and an adhesive layer is processed into a predetermined molding shape by roll forming, pressing, or the like. The undercoat coating layer and the adhesive layer follow the plastic deformation of the base steel sheet during the forming process and exist on the surface of the molding core as a uniform coating. Even if there are some processing defects in the undercoat coating layer and the adhesive layer, the adhesive layer is compatible and integrated with the outermost resin layer in the composite extrusion process that joins the outermost resin layer. The defects are eliminated, and in addition, the calcium silicate and / or the phosphoric acid compound in the undercoat layer suppresses the base corrosion caused by the processing defects.
所定形状に加工された成形体は、樹脂混錬成形機のダイスに導入される。ダイスに注入される最外層用樹脂とともに押し出す複合押出成形によって最外樹脂層として成形体を被覆する。複合押出成形時の受熱で接着剤層が１５０〜２５０℃程度に加熱され、接着剤層の表層が最外層用樹脂と融和し、接着剤層が最外樹脂層に相溶一体化する。最外樹脂層が接着剤層および下塗り塗膜層を介してモールディング芯材に接合されるため、高い接合力、密着力、高耐食性が得られる。これは、モールディング芯材の表面に均一な下塗り塗膜層および接着剤層を有することから、モールディング芯材／最外樹脂層の界面に非接合部が生じないことによる。 The molded body processed into a predetermined shape is introduced into a die of a resin kneading molding machine. The molded body is coated as an outermost resin layer by composite extrusion molding that is extruded together with the outermost layer resin injected into the die. The adhesive layer is heated to about 150 to 250 ° C. by receiving heat at the time of composite extrusion, the surface layer of the adhesive layer is fused with the resin for the outermost layer, and the adhesive layer is compatible and integrated with the outermost resin layer. Since the outermost resin layer is bonded to the molding core through the adhesive layer and the undercoat coating layer, high bonding strength, adhesion, and high corrosion resistance can be obtained. This is because a uniform undercoat coating layer and an adhesive layer are formed on the surface of the molding core material, so that no non-bonded portion is formed at the molding core / outermost resin layer interface.
モールディング部材の形状によっては、芯材の内側や側面に接着剤層が剥き出し状態になる。しかし、接着剤層の界面にはカルシウムシリケートおよび、もしくはリン酸化合物を含有するエポキシ樹脂からなる下塗り塗膜層が存在するため支障はなく、そのまま残存させてよい。すなわち、本来、下地が露出する内面や側面でも下塗り塗膜および接着剤層で被覆されるので、モールディング部材としての耐食性も格段に向上する。 Depending on the shape of the molding member, the adhesive layer is exposed on the inside and side surfaces of the core material. However, since there is an undercoat film layer made of an epoxy resin containing calcium silicate and / or a phosphoric acid compound at the interface of the adhesive layer, there is no problem and it may be left as it is. That is, the inner surface and the side surface where the base is exposed are originally covered with the undercoat coating film and the adhesive layer, so that the corrosion resistance as a molding member is significantly improved.
実施例１；
板厚：０．４ｍｍ、片面当りめっき付着量：１２０ｇ／ｍ２のＺｎ−Ａｌ−Ｍｇ合金めっき鋼板（Ｚｎめっき層の合金成分含有率；Ａｌ：６質量％、Ｍｇ：３質量％、Ｔｉ：０．０２質量％、Ｂ：０．０８質量％）をモールディング芯材に使用した。Ｚｎ−Ａｌ−Ｍｇ合金めっき鋼板をアルカリ脱脂し、チタン系の非クロメート処理によってＴｉ換算付着量：１５ｍｇ／ｍ２の化成皮膜を形成した後、カルシウムシリケートを１０質量部、トリポリリン酸アルミニウムを２０質量部配合したエポキシ樹脂からなる下塗り塗料を乾燥膜厚が５μｍになるように塗布し、２２５℃の雰囲気中で１分間焼付け乾燥し、次いで、アクリル樹脂とエポキシ樹脂を６：４の質量比で配合した混合樹脂からなる接着剤を乾燥膜厚が５μｍになるように塗布し、２３５℃の雰囲気中で１分間焼付け乾燥して、下塗り塗膜層および接着剤層を設けた。
Example 1;
Plate thickness: 0.4 mm, plating adhesion amount per side: 120 g / m 2 Zn—Al—Mg alloy plated steel sheet (Al alloy component content of Zn plating layer; Al: 6 mass%, Mg: 3 mass%, Ti: 0.02 mass%, B: 0.08 mass%) was used for the molding core material. A Zn-Al-Mg alloy-plated steel sheet is degreased with alkali, and after forming a chemical conversion film having a Ti equivalent adhesion amount of 15 mg / m 2 by titanium-based non-chromate treatment, 10 parts by mass of calcium silicate and 20 parts by mass of aluminum tripolyphosphate A primer coating composed of a partially mixed epoxy resin is applied so that the dry film thickness is 5 μm, baked and dried in an atmosphere of 225 ° C. for 1 minute, and then blended with a mass ratio of 6: 4 acrylic resin and epoxy resin. The adhesive made of the mixed resin was applied so that the dry film thickness was 5 μm, and baked and dried in an atmosphere of 235 ° C. for 1 minute to provide an undercoat coating layer and an adhesive layer.
下塗り塗膜層および接着剤層を設けたＺｎ−Ａｌ−Ｍｇ合金めっき鋼板を幅：５０ｍｍの短冊状切板に裁断し、短冊状切板をロールフォーミングで幅：１５ｍｍ、高さ：２５ｍｍのほぼＣ型断面形状に成形した。次いで、樹脂混錬成形機のダイスに導入し、ポリ塩化ビニル樹脂をダイスに注入しながらＣ型断面成形体とともに押し出すことにより、膜厚２ｍｍのポリ塩化ビニル樹脂層（最外樹脂層）が接合されたモールディング部材を得た。Ｃ型断面成形体は複合押出成形時に１７０〜２２０℃程度に加熱され、接着剤層はポリ塩化ビニル樹脂層（最外樹脂層）と完全に一体化されていた。 A Zn—Al—Mg alloy-plated steel sheet provided with an undercoat coating layer and an adhesive layer is cut into a strip-shaped cut plate having a width of 50 mm, and the strip-shaped cut plate is almost formed with a width of 15 mm and a height of 25 mm by roll forming. Molded into a C-shaped cross section. Next, it is introduced into a die of a resin kneading molding machine and extruded together with a C-shaped cross-section molding while pouring polyvinyl chloride resin into the die, thereby joining a polyvinyl chloride resin layer (outermost resin layer) having a thickness of 2 mm. A molded member was obtained. The C-shaped cross-sectional molded body was heated to about 170 to 220 ° C. during the composite extrusion molding, and the adhesive layer was completely integrated with the polyvinyl chloride resin layer (outermost resin layer).
実施例２；
下塗り塗料がトリポリリン酸アルミニウムを含有せず、接着剤が酸変性ポリオレフィン樹脂であり、また、最外層用樹脂がポリプロピレン樹脂で膜厚：２ｍｍである以外は実施例１と同じ条件でモールディング部材を作製した。この場合の接着剤層もポリオレフィン樹脂層（最外樹脂層）と完全に一体化されていた。
Example 2;
A molding member is produced under the same conditions as in Example 1 except that the undercoat paint does not contain aluminum tripolyphosphate, the adhesive is an acid-modified polyolefin resin, and the outermost layer resin is a polypropylene resin and the film thickness is 2 mm. did. The adhesive layer in this case was also completely integrated with the polyolefin resin layer (outermost resin layer).
比較例１；
下塗り塗料がカルシウムシリケートおよびトリポリリン酸アルミニウムを含有せず、接着剤が混合樹脂に対してカルシウムシリケートを３０質量部配合する以外は、実施例１と同じ条件でモールディング部材を作製した。この場合の接着剤層もポリ塩化ビニル樹脂層（最外樹脂層）と完全に一体化されていた。
Comparative Example 1;
A molding member was produced under the same conditions as in Example 1, except that the undercoat paint did not contain calcium silicate and aluminum tripolyphosphate, and the adhesive compounded 30 parts by mass of calcium silicate with respect to the mixed resin. The adhesive layer in this case was also completely integrated with the polyvinyl chloride resin layer (outermost resin layer).
実施例１、実施例２および比較例１で製造されたモールディング部材を２０００時間の塩水噴霧試験に供し、端面の樹脂フクレ幅を測定した。実施例１が０．５ｍｍであり、実施例２が１ｍｍであり、比較例１が５ｍｍであった。なお、塩水噴霧試験後に各モールディング部材の端面から最外樹脂層を強制剥離し、剥離状態を調査した。その結果、いずれも密着性が良好であり最外樹脂層が材料破断した。 The molding members manufactured in Example 1, Example 2, and Comparative Example 1 were subjected to a salt spray test for 2000 hours, and the resin swelling width of the end face was measured. Example 1 was 0.5 mm, Example 2 was 1 mm, and Comparative Example 1 was 5 mm. In addition, the outermost resin layer was forcibly peeled from the end surface of each molding member after the salt spray test, and the peeled state was investigated. As a result, all had good adhesiveness and the outermost resin layer was broken.
従来からモールディング芯材として使用されてきたステンレス鋼と遜色ない切断端面部耐食性が得られ、密着性、耐食性の高いモールディング部材が低コストで得られる。
Corrosion resistance of the cut end surface, which is comparable to that of stainless steel conventionally used as a molding core, is obtained, and a molding member having high adhesion and corrosion resistance can be obtained at low cost.
Claims (4)
The automobile molding member according to claim 1 or 2, wherein the adhesive layer is made of an acid-modified polyolefin resin, and the outermost resin layer is made of a polypropylene resin.
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| JP2005113504A JP2006290157A (en) | 2005-04-11 | 2005-04-11 | Molding member for automobile |
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| JP2005113504A JP2006290157A (en) | 2005-04-11 | 2005-04-11 | Molding member for automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012529389A (en) * | 2009-06-08 | 2012-11-22 | アルセロルミタル・インベステイガシオン・イ・デサロジヨ・エセ・エレ | Composite metal and polymer parts, especially in the automotive field |
| JP2017170690A (en) * | 2016-03-22 | 2017-09-28 | 凸版印刷株式会社 | Composite film |
| WO2020129473A1 (en) * | 2018-12-20 | 2020-06-25 | Ｊｆｅスチール株式会社 | Surface-treated steel sheet |
-
2005
- 2005-04-11 JP JP2005113504A patent/JP2006290157A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012529389A (en) * | 2009-06-08 | 2012-11-22 | アルセロルミタル・インベステイガシオン・イ・デサロジヨ・エセ・エレ | Composite metal and polymer parts, especially in the automotive field |
| US9950497B2 (en) | 2009-06-08 | 2018-04-24 | Arcelormittal Investigacion Y Desarrollo | Composite metal and polymer part |
| JP2017170690A (en) * | 2016-03-22 | 2017-09-28 | 凸版印刷株式会社 | Composite film |
| WO2020129473A1 (en) * | 2018-12-20 | 2020-06-25 | Ｊｆｅスチール株式会社 | Surface-treated steel sheet |
| JPWO2020129473A1 (en) * | 2018-12-20 | 2021-02-15 | Ｊｆｅスチール株式会社 | Surface-treated steel sheet |
| CN113195757A (en) * | 2018-12-20 | 2021-07-30 | 杰富意钢铁株式会社 | Surface-treated steel sheet |
| EP3901296A4 (en) * | 2018-12-20 | 2022-01-19 | JFE Steel Corporation | Surface-treated steel sheet |
| US20220112579A1 (en) * | 2018-12-20 | 2022-04-14 | Jfe Steel Corporation | Surface-treated steel sheet |
| US11795526B2 (en) * | 2018-12-20 | 2023-10-24 | Jfe Steel Corporation | Surface-treated steel sheet |
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