JP2957303B2 - Damping steel sheet with excellent workability and its manufacturing method - Google Patents

Damping steel sheet with excellent workability and its manufacturing method

Info

Publication number
JP2957303B2
JP2957303B2 JP3112249A JP11224991A JP2957303B2 JP 2957303 B2 JP2957303 B2 JP 2957303B2 JP 3112249 A JP3112249 A JP 3112249A JP 11224991 A JP11224991 A JP 11224991A JP 2957303 B2 JP2957303 B2 JP 2957303B2
Authority
JP
Japan
Prior art keywords
steel sheet
resin
heating
thickness
foaming agent
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.)
Expired - Lifetime
Application number
JP3112249A
Other languages
Japanese (ja)
Other versions
JPH04319433A (en
Inventor
勝士 斉藤
良男 石井
亜紀良 武田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP3112249A priority Critical patent/JP2957303B2/en
Publication of JPH04319433A publication Critical patent/JPH04319433A/en
Application granted granted Critical
Publication of JP2957303B2 publication Critical patent/JP2957303B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/53—Base coat plus clear coat type
    • B05D7/532—Base coat plus clear coat type the two layers being cured or baked together, i.e. wet on wet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2503/00—Polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2507/00—Polyolefins
    • B05D2507/02—Polypropylene

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は自動車・家電・建材に使
用されるユーザー工程で加熱することによって発泡する
発泡性樹脂を被覆した軽量で多機能型の制振鋼板に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight, multifunctional vibration-damping steel sheet coated with a foaming resin which is foamed by heating in a user process used for automobiles, home appliances and building materials.

【０００２】[0002]

【従来の技術】自動車産業においては車体重量の軽量化
および居住性の観点から軽量で制振性、遮音性、吸音、
断熱性に優れ車体生産性の良い素材を求めている。自動
車においてはこの特性を得るためハイテン鋼板、制振鋼
板を導入して軽量、剛性、制振性を高めさらにハニカ
ム、粘弾性ゴムや発泡樹脂シートの複合によるダンピン
グシート等を組み合せた構造体で対応している。これら
の複雑な構造は製造工程を複雑化しコストを引上げる結
果となる。材料強度およびコストの関係から鋼板は有利
であり、鋼板と有機素材と複合した樹脂サンドイッチ型
制振鋼板が開発された。しかし、樹脂サンドイッチ型制
振鋼板は制振特性は優れているが軽量性、制振性、遮音
性、吸音性、断熱性、加工性の観点ではさらに改善が必
要である。また、家電・建材においても自動車と同様に
吸音、遮音特性、断熱性、加工性のある軽量制振鋼板が
要求されている。本発明は車体、家電、建材を対象とし
た多機能の特性を有する軽量の制振鋼板とその製造方法
に関するものである。本発明は軽量、制振、吸音、遮
音、断熱等の多機能を付与した薄膜型の加熱発泡剤を含
む発泡性樹脂皮膜を利用した制振鋼板である。本発明に
関連する公開された技術としては特開昭６３−２２７３
２８号公報の自動車用プレコート鋼板がある。公開技術
はプレス時には未発泡樹脂であり、塗装焼き付け工程で
発泡する樹脂を被覆したことを特徴とする自動車用プレ
コート鋼板である。公開技術では樹脂の厚みはプレス性
の観点から１．０ｍｍ未満が望ましいとされ、また、ガ
ラス繊維強化の硬質樹脂を最上層に被覆する技術が記載
されている。2. Description of the Related Art In the automobile industry, from the viewpoints of reducing the weight of a vehicle body and the comfort of a vehicle, it is lightweight and has vibration damping, sound insulation, sound absorption, and the like.
We are looking for materials with excellent heat insulation and good body productivity. In order to achieve this characteristic, high-strength steel sheets and vibration-damping steel sheets are introduced to increase the weight, rigidity and vibration damping properties of automobiles, and a structure combining a honeycomb, a viscoelastic rubber and a foamed resin sheet combined with a damping sheet is used. doing. These complex structures result in complicated manufacturing processes and increased costs. Steel sheets are advantageous in terms of material strength and cost, and a resin sandwich-type damping steel sheet that is a composite of steel sheets and organic materials has been developed. However, although the resin sandwich type vibration damping steel sheet has excellent vibration damping properties, further improvements are required in terms of lightness, vibration damping properties, sound insulation properties, sound absorption properties, heat insulation properties, and workability. In addition, as with automobiles, home appliances and building materials are also required to have a lightweight damping steel sheet having sound absorption, sound insulation properties, heat insulation properties, and workability. TECHNICAL FIELD The present invention relates to a lightweight vibration-damping steel sheet having multifunctional characteristics for a vehicle body, a home appliance, and a building material, and a method for manufacturing the same. The present invention is a vibration-damping steel sheet using a foamable resin film containing a thin-film-type heating foaming agent provided with multi-functions such as light weight, vibration damping, sound absorption, sound insulation, and heat insulation. A published technique related to the present invention is disclosed in JP-A-63-2273.
No. 28 discloses a pre-coated steel sheet for automobiles. The disclosed technology is a pre-coated steel sheet for automobiles, which is an unfoamed resin at the time of pressing and is coated with a resin that foams in a paint baking process. According to the disclosed technology, the thickness of the resin is desirably less than 1.0 mm from the viewpoint of pressability, and a technology of covering the uppermost layer with a glass fiber reinforced hard resin is described.

【０００３】[0003]

【発明が解決しようとする課題】上述した従来の樹脂サ
ンドイッチ鋼板は制振性、溶接性が優れているがより多
機能化の要求については改善すべき課題がある。特開昭
６３−２２７３２８号公報の自動車用プレコート鋼板は
樹脂の厚みが１ｍｍ以上の厚い場合には加熱によって発
生するガスを効率よく捕らえ均一な発泡樹脂を得ること
ができるが、プレス性が低下する。プレス性を考慮する
と薄い樹脂厚みが望ましいが加熱発泡する際に発泡する
ガスが樹脂膜を通過若しくは破壊して抜けるためガスを
効率よく捕らえることが難しく高倍率の発泡樹脂皮膜が
得られない。また、発泡後の表面は泡によって凹凸が生
じ、薄い膜厚では孔あきが生じ易い。また、加熱すると
熱伝導の関係から鋼板側から熱が供給されるため鋼板側
に大きいサイズの泡、表面側に小さいサイズの泡の形態
となり制振鋼板として振動を抑制する拘束力が低くなる
問題がある。ガラス繊維で強化した硬質樹脂を被覆した
制振鋼板は平板での特性は優れているが加工性が得られ
ない問題がある。本発明は薄い膜厚の樹脂を被覆した制
振鋼板でプレス加工性に優れ加熱することによって均一
に独立気泡型の発泡樹脂が得られ、発泡樹脂且つ振動を
抑制する拘束型の作用機構を加えた画期的な制振鋼板を
提供するものである。The above-mentioned conventional resin sandwich steel sheet is excellent in vibration damping property and weldability, but has a problem to be improved in the demand for multifunctionality. Japanese Patent Application Laid-Open No. 63-227328 discloses a precoated steel sheet for automobiles in which when the thickness of the resin is 1 mm or more, a gas generated by heating can be efficiently caught and a uniform foamed resin can be obtained, but pressability decreases. . Considering the pressability, a thin resin thickness is desirable, but the gas to be foamed during heating and foaming passes through or breaks through the resin film, so that it is difficult to efficiently capture the gas and a high-magnification foamed resin film cannot be obtained. In addition, the surface after foaming has irregularities due to the foam, and a hole having a small thickness tends to be formed. In addition, when heated, heat is supplied from the steel sheet side due to heat conduction, so that large-sized bubbles are formed on the steel sheet side and small-sized bubbles are formed on the surface side. There is. Damping steel sheets coated with a hard resin reinforced with glass fibers have excellent flat plate characteristics, but have the problem that workability cannot be obtained. The present invention provides a closed-cell foamed resin uniformly by heating the vibration-damping steel sheet coated with a resin having a thin film thickness and having excellent press workability. It is intended to provide a revolutionary damping steel plate.

【０００４】[0004]

【課題を解決するための手段】（１） 鋼板もしくはめっき鋼板の表面に下層として膜厚
５０〜７００ミクロンの加熱発泡剤入り樹脂を装着し、
上層として潤滑剤を含有する膜厚１００ミクロン以下の
熱硬化型樹脂塗料を被覆したことを特徴とする加工性に
優れた制振鋼板。（２） 鋼板もしくはめっき鋼板の表面に接着剤を塗布し
たのちドライ膜厚として５０〜７００ミクロンの加熱発
泡剤入り樹脂を融液、粉末、塗料もくしくフィルムのい
ずれかの形で被覆し、さらにその上に熱硬化型樹脂塗料
をドライ膜厚として１００ミクロン以下塗布し発泡剤の
分解温度以下の温度で加熱することを特徴とする加工性
に優れた制振鋼板の製造方法。（３） 鋼板もしくはめっき鋼板の表面に接着剤を塗布し
たのちドライ膜厚として５０〜７００ミクロンの加熱発
泡剤入り樹脂を融液、粉末、塗料もくしくフィルムのい
ずれかの形で被覆し、さらにその上に潤滑剤を含有する
熱硬化型樹脂塗料をドライ膜厚として１００ミクロン以
下塗布し発泡剤の分解温度以下の温度で加熱することを
特徴とする加工性に優れた制振鋼板の製造方法にある。Means for Solving the Problems (1) A resin containing a heating foaming agent having a thickness of 50 to 700 microns is attached as a lower layer on the surface of a steel sheet or a plated steel sheet,
A vibration-damping steel sheet excellent in workability, characterized by being coated with a thermosetting resin paint containing a lubricant and having a thickness of 100 μm or less containing a lubricant. (2) After applying an adhesive to the surface of a steel plate or a plated steel plate, a resin containing a heating foaming agent having a dry film thickness of 50 to 700 microns is coated in any form of a melt, a powder, a paint or a film , A method for producing a vibration-damping steel sheet having excellent workability, further comprising applying a thermosetting resin coating material thereon to a dry film thickness of 100 μm or less and heating at a temperature not higher than the decomposition temperature of the foaming agent. (3) After applying an adhesive to the surface of a steel sheet or a plated steel sheet, a resin containing a heating foaming agent having a dry film thickness of 50 to 700 microns is coated in any form of a melt, a powder, a paint or a film , Furthermore, a thermosetting resin paint containing a lubricant is applied thereon as a dry film having a thickness of 100 μm or less and heated at a temperature not higher than the decomposition temperature of the foaming agent. In the way.

【０００５】[0005]

【作用】本発明は連続的に生産される加熱発泡剤を含む
樹脂を被覆した制振鋼板に関するものであり鋼板メーカ
ーからは薄い未発泡状態の樹脂が被覆された制振鋼帯と
して出荷し、プレス加工後、脱脂等化学的な後処理、塗
装を経て加熱処理されこの時点で未発泡樹脂中の発泡剤
が分解し樹脂の軟化、架橋硬化のバランスからガスが樹
脂中に固定され発泡樹脂が形成される。自動車車体の製
造工程では、電着塗装の焼付ゾーンを利用することがで
き、従来のプロセスで得られる。本発明は図１に示すよ
うに鋼板ｄの表面に分解しない低温接着剤を塗装（接着
層ｃ）し発泡剤を含む樹脂を被覆（加熱発泡剤入り樹脂
層ｂ），その上層に更に薄い樹脂塗装もしくは箔などを
被覆（上層皮膜層ａ）した三層皮膜で構成する。接着層
−発泡性樹脂層−上層皮膜の三層皮膜の全厚みはプレス
性、コストの関係から１ｍｍ以下が必要である。本発明
は制振性等の特性の寄与率の高い発泡性樹脂層を厚みを
５０−７００ミクロンと非常に薄く抑えてプレス性を確
保する。１００ミクロン以下の上層皮膜層は加熱発泡工
程において薄膜に起因するガス抜けの問題を解決して発
泡倍率を確保し且つ均一な泡分散樹脂層および表面平滑
性を与え、さらに、鋼板を上層皮膜層によって発泡樹脂
層をサンドイッチした擬似的な拘束性を与えて制振性、
剛性を向上させるものである。The present invention relates to a damping steel sheet coated with a resin containing a heating foaming agent which is continuously produced, and is shipped from a steel sheet manufacturer as a thin damping steel strip coated with a thin unfoamed resin. After pressing, heat treatment is performed through chemical post-treatments such as degreasing and painting.At this point, the foaming agent in the unfoamed resin is decomposed and the gas is fixed in the resin from the balance of softening and crosslinking and curing of the resin, and the foamed resin is It is formed. In the manufacturing process of an automobile body, a baking zone of electrodeposition coating can be used and can be obtained by a conventional process. According to the present invention, as shown in FIG. 1, a low-temperature adhesive which does not decompose is applied to the surface of the steel sheet d (adhesive layer c), and a resin containing a foaming agent is coated (resin layer b containing a heating foaming agent). It is composed of a three-layer film coated with paint or foil (upper layer film a). The total thickness of the three layers of the adhesive layer, the foamable resin layer and the upper layer film is required to be 1 mm or less from the viewpoint of pressability and cost. According to the present invention, the foaming resin layer having a high contribution rate of characteristics such as vibration damping properties is suppressed to a very small thickness of 50 to 700 microns to ensure pressability. The upper coating layer of 100 μm or less solves the problem of outgassing caused by the thin film in the heating and foaming step, secures a foaming ratio, provides a uniform foam-dispersed resin layer and a surface smoothness, and further forms a steel sheet on the upper coating layer. By giving a pseudo-constraining property by sandwiching the foamed resin layer with
This is to improve rigidity.

【０００６】以下各層について説明する。本発明に用い
る鋼板は熱延鋼板、冷延鋼板、電気めっき鋼板、溶融め
っき鋼板に属する薄鋼板である。鋼板の厚みは軽量性、
強度の観点から０．３−１．２ｍｍが望ましい。接着層
は加熱発泡剤入り樹脂と鋼板の接着強度が得られればよ
く薄いほうが良好である。厚すぎると逆にプレス加工時
に凝集破壊により密着性が低下する。接着層は１−１０
ミクロンが好ましい厚みであり、塗布タイプの接着剤が
好ましい。接着剤は加熱発泡剤入り樹脂と親和力が強く
発泡剤の分解温度以下の１５０℃以下で硬化する接着剤
を用いることが出来る。本発明に用いる接着剤としては
マレイン酸等のカルボキシル基やフェノール等の水三酸
基もしくは二重結合を付与したオレフィン系接着剤、ポ
リプタジエン接着剤、クロロプレンゴム接着剤、エポキ
シ接着剤、フェノール接着剤、ポリアミド接着剤、ポリ
エステル接着剤、シリコーン接着剤、ウレタン接着剤を
適用できる。以下加熱発泡剤入り樹脂について述べる。
加熱発泡剤入り樹脂層の厚みが５０ミクロン未満では発
泡するガスを封じ込める樹脂膜厚が不足するため発泡効
果が低下し好ましくない。７００ミクロン超ではプレス
成形材の精度や打ち抜き、切断においてエッジ精度が得
られない。加熱発泡剤入り樹脂層は１００−５００ミク
ロンが最も好ましい厚みである。発泡倍率は２−２０倍
が本発明に利用出来、３−１０倍が好ましい範囲であ
る。２倍未満の倍率では発泡樹脂としての効果が実用的
でなく２０倍超では強度、制振性が低下するため好まし
くない。Hereinafter, each layer will be described. The steel sheet used in the present invention is a thin steel sheet belonging to a hot-rolled steel sheet, a cold-rolled steel sheet, an electroplated steel sheet, and a hot-dip steel sheet. The thickness of the steel plate is lightweight,
0.3-1.2 mm is desirable from the viewpoint of strength. As long as the adhesive strength between the resin containing the heating foaming agent and the steel sheet can be obtained, the adhesive layer is preferably thinner. On the other hand, if the thickness is too large, cohesive failure during press working lowers the adhesion. The adhesive layer is 1-10
Micron is the preferred thickness, and coating-type adhesives are preferred. As the adhesive, an adhesive having a strong affinity with the resin containing the heating foaming agent and hardening at 150 ° C. or lower which is lower than the decomposition temperature of the foaming agent can be used. Examples of the adhesive used in the present invention include an olefin adhesive having a carboxyl group such as maleic acid or a water triacid group such as phenol or a double bond, a polybutadiene adhesive, a chloroprene rubber adhesive, an epoxy adhesive, and a phenol adhesive. , A polyamide adhesive, a polyester adhesive, a silicone adhesive, and a urethane adhesive. Hereinafter, the resin containing a heating foaming agent will be described.
If the thickness of the resin layer containing the heating foaming agent is less than 50 microns, the foaming effect is reduced because the resin film thickness for containing the gas to be foamed is insufficient, which is not preferable. If it exceeds 700 microns, the edge accuracy cannot be obtained in the precision of the press-formed material or in punching and cutting. The most preferable thickness of the resin layer containing the heating foaming agent is 100 to 500 microns. An expansion ratio of 2 to 20 times can be used in the present invention, and 3 to 10 times is a preferable range. When the magnification is less than 2 times, the effect as a foamed resin is not practical, and when the magnification is more than 20 times, the strength and vibration damping properties are undesirably reduced.

【０００７】発泡性樹脂としては通常発泡体として使用
されるポリオレフィン系樹脂、ポリスチロール樹脂、ポ
リウレタン系樹脂を含め、熱可塑性樹脂及び熱硬化性樹
脂の多くが使用出来るが、プレコート鋼板はプレス成形
後、組立体として脱脂、化成処理、電着塗装などの工程
を経るので伸び率が大きく、且つ耐化学薬品性、電気絶
縁性に優れているポリオレフィン系樹脂が最も適してい
る。また高分子化合物の中で、比重の小さい樹脂なので
軽量補強材として良好である。ポリオレフィン系樹脂は
温度上昇に伴って急激な粘度低下を生じるので、発泡温
度域を拡げ、安定した発泡を行うには化学架橋により樹
脂溶融時に粘弾性を改善することが好適である。従って
鋼板に塗覆装するポリオレフィン系樹脂層には予め化学
架橋剤を含有させておくとよい。架橋剤としてはジクミ
ルパ−オキサイド、２，５−ジメチル−２，５−ジ（ｔ
ｅｒｔ−ブチルパ−オキシ）ヘキシン−３および１，３
−ビズ（ｔｅｒｔ−ブチルパ−オキシイソプロピル）ベ
ンゼンなどの通常の架橋剤の全てが使用出来る。その添
加量としては樹脂１００重量部に対し、０．１〜２０重
量部が好ましい。同じく樹脂層に予め含有させておく発
泡剤としてはアゾジカルボンアミド、イソブチロニトリ
ル、ジアゾアミノベンゼン、Ｎ，Ｎ´−ジニトロソペン
タメチレンテトラミン、Ｐ，Ｐ´−オキシビスベンゼン
スルホニルヒドラジドなどの市販の多くの発泡剤が使用
出来る。その添加量としては発泡倍率により異なるが、
樹脂１００重量部に対し通常２〜３０重量部位である。
発泡剤は車体塗装後の塗料焼付温度で分解発泡する発泡
剤を選定することが必要で、電着塗装後の焼付温度及び
焼付時間は通常１６０〜２００℃で２０〜３０分間であ
るが、今後省エネルギーの見地から１００℃に近い低温
焼付硬化型の塗料に進展しても、それに見合った重炭酸
ナトリウム、炭酸アンモニウムなどの無機系の低温分解
型発泡剤を選定すれば本発明を実施することは可能であ
る。ポリオレフィン系樹脂を高倍率発泡すると樹脂層の
強度が低下する方向にあるので、曲げ剛性に対する補強
硬化を向上するには更に架橋度を上げると良い。発泡に
先立って架橋度を上げすぎると安定した発泡が抑圧され
るので、始め低分解温度の架橋剤で化学架橋を先行さ
せ、樹脂溶融時の流動性を低下させ、或る程度の形状維
持性が出た所で、発泡剤が分解し、気泡発泡が始まるよ
うにする。そして完全な発泡樹脂層になっても更により
高分解温度の架橋剤で化学架橋を連続して行ない、高架
橋度の発泡した樹脂層を生成させるのである。また、補
強効果を向上する別法として伸び率の小さい、機械的強
度の大きい樹脂をプレス成形性を損わない範囲でポリオ
レフィン系樹脂に混合することも出来る。また樹脂層に
ガラス繊維などを混入して塗覆装することも補強効果を
上げる一方法である。As the foamable resin, many thermoplastic resins and thermosetting resins can be used, including polyolefin resins, polystyrene resins, and polyurethane resins, which are usually used as foams. Since the assembly undergoes processes such as degreasing, chemical conversion treatment, and electrodeposition coating, a polyolefin-based resin having a high elongation rate and excellent in chemical resistance and electrical insulation is most suitable. In addition, among the polymer compounds, a resin having a small specific gravity is preferable as a lightweight reinforcing material. Since the viscosity of a polyolefin-based resin rapidly decreases with an increase in temperature, it is preferable to improve the viscoelasticity at the time of melting the resin by chemical crosslinking in order to expand the foaming temperature range and perform stable foaming. Therefore, it is preferable that the polyolefin resin layer to be coated and coated on the steel sheet contains a chemical crosslinking agent in advance. As crosslinking agents, dicumyl peroxide, 2,5-dimethyl-2,5-di (t
tert-butyl peroxy) hexyne-3 and 1,3
All of the usual crosslinking agents such as -biz (tert-butylperoxyisopropyl) benzene can be used. The addition amount is preferably 0.1 to 20 parts by weight based on 100 parts by weight of the resin. Similarly, commercially available foaming agents previously contained in the resin layer include azodicarbonamide, isobutyronitrile, diazoaminobenzene, N, N'-dinitrosopentamethylenetetramine, and P, P'-oxybisbenzenesulfonylhydrazide. Many blowing agents can be used. The amount added depends on the expansion ratio,
It is usually 2 to 30 parts by weight based on 100 parts by weight of the resin.
It is necessary to select a foaming agent that decomposes and foams at the paint baking temperature after painting the car body. The baking temperature and baking time after electrodeposition coating are usually 160 to 200 ° C and 20 to 30 minutes, but in the future Even from the viewpoint of energy saving, even if a low-temperature bake-hardening paint approaching 100 ° C. is developed, the present invention can be implemented by selecting an inorganic low-temperature decomposable foaming agent such as sodium bicarbonate and ammonium carbonate. It is possible. When the polyolefin resin is foamed at a high magnification, the strength of the resin layer tends to decrease. Therefore, it is preferable to further increase the degree of cross-linking in order to improve the reinforcement hardening with respect to the bending rigidity. If the degree of crosslinking is too high prior to foaming, stable foaming will be suppressed, so chemical crosslinking will be preceded by a low-decomposition temperature crosslinking agent at first, reducing the fluidity during resin melting, and maintaining a certain degree of shape retention. The foaming agent is decomposed at the point where bubbles appear, and foaming starts. Then, even when a complete foamed resin layer is obtained, chemical crosslinking is continuously performed with a crosslinking agent having a still higher decomposition temperature to produce a foamed resin layer having a high degree of crosslinking. As another method of improving the reinforcing effect, a resin having a small elongation and a high mechanical strength can be mixed with the polyolefin resin within a range not to impair press moldability. In addition, it is one method to increase the reinforcing effect by coating and covering the resin layer with glass fiber or the like.

【０００８】以下、上層皮膜について説明する。上層皮
膜の厚みが１００ミクロン超では熱硬化性樹脂のためプ
レス加工性、吸音性が低下する問題がある。上層皮膜の
厚みが薄いと発泡樹脂が得られ難いため５−５０ミクロ
ンが望ましい膜厚である。上層皮膜は熱硬化型の樹脂塗
料を使用する。樹脂としてはメラミン樹脂、アクリル樹
脂、エポキシ樹脂、オレフィン樹脂、変性オレフィン樹
脂、ウレタン樹脂、フェノール樹脂が適用できる。プレ
ス性確保の観点から、テフロンワックス、金属石鹸、等
の潤滑剤を分散した上層皮膜を使用することによりプレ
ス性が向上する。オレフィン樹脂の場合、密着性を確保
するため公知の前処理例えばクロム酸エッチング処理、
コロナ放電処理、プラズマ放電処理、火災処理等を実施
することが望ましい。Hereinafter, the upper film will be described. If the thickness of the upper layer coating is more than 100 microns, there is a problem that press workability and sound absorption are reduced due to the thermosetting resin. When the thickness of the upper layer film is small, it is difficult to obtain a foamed resin. For the upper layer film, a thermosetting resin paint is used. As the resin, melamine resin, acrylic resin, epoxy resin, olefin resin, modified olefin resin, urethane resin, and phenol resin can be used. From the viewpoint of ensuring pressability, pressability is improved by using an upper layer film in which a lubricant such as Teflon wax or metal soap is dispersed. In the case of an olefin resin, a known pretreatment such as a chromic acid etching treatment is performed to secure adhesion.
It is desirable to carry out corona discharge treatment, plasma discharge treatment, fire treatment and the like.

【０００９】以下、製造方法について説明する。薄鋼板
コイルもしくはめっき鋼板コイルの表面に必要によりク
ロメート、リン酸塩処理等の化成処理を行なった後、接
着剤を塗布する。加熱乾燥により溶媒を揮発させ、接着
剤を軟化させて加熱発泡剤入り樹脂を被覆する。加熱発
泡剤入り樹脂の被覆方法は公知の技術である加熱して溶
融化した融液をスリットから押出し塗布するダイコーテ
ィング法、フィルム貼り合わせ法、粉末静電塗装法、ロ
ールコート法等によって被覆する。ついで軽加重で圧着
し、化成処理後、熱硬化性樹脂塗料を被覆し焼き付けた
後、冷却し巻き取る。Hereinafter, the manufacturing method will be described. The surface of the thin steel sheet coil or the plated steel sheet coil is subjected to a chemical conversion treatment such as a chromate treatment or a phosphate treatment as necessary, and then an adhesive is applied. The solvent is volatilized by heating and drying, the adhesive is softened, and the resin containing the heating foaming agent is coated. The coating method of the resin containing the heating foaming agent is performed by a known technique, such as a die coating method in which a melt melted by heating is extruded through a slit and applied, a film bonding method, a powder electrostatic coating method, a roll coating method, or the like. . Then, it is press-bonded under light load, and after a chemical conversion treatment, it is coated with a thermosetting resin paint and baked, then cooled and wound up.

【００１０】[0010]

【実施例】実施例１ 板厚０．８ｍｍの冷延鋼板コイルをオルソケイ酸ナトリ
ウム水溶液で電解脱脂後、市販の塗装下地用クロメート
をＣｒ換算付着量として１平方メートル当り３０ミリグ
ラム塗布し熱風で乾燥したのち、マレイン酸変性のオレ
フィン接着剤を１平方メートル当り５グラム塗布し１３
０℃に加熱し、ついで発泡倍率の異なる濃度を配合した
発泡剤（アゾジカルボン酸アミド）および架橋剤を含む
低密度ポリエチレン樹脂（ＬＤＰＥ）のフィルムを貼り
合わせ金属冷却ロールで軽圧着したのち、クロム酸に接
着させて表面を酸化し、ついで２液型ビスフェノール型
エポキシ樹脂クリヤー塗料を塗布し１３０℃に焼き付け
て発泡性樹脂を被覆した制振鋼板コイルを製造した。２
００×３００ｍｍに切断して未発泡サンプルを作成し、
試験サイズに切断後、熱風式電気炉で１７０−２００℃
に２５分加熱して発泡させ、機械インピーダンスによる
損失係数を温度４０℃周波数３００ヘルツで測定した。
また、鋼板の表面に発泡した樹脂面を接触させ鋼板の反
対面から赤外線で加熱し鋼板の昇温速度を測定した。ま
た、未発泡サンプルを樹脂側をポンチ面（直径１００ｍ
ｍ）として球頭カップ絞りを行ない破断高さを測定し
た。また、遮音性は容積０．２５立方メートル無響音箱
と残響箱の付き合わせ面に３００×３００の発泡させた
サンプルをはめこみ最箱を密着させ音源を残響箱、騒音
計を無響音箱に入れて透過損失（デシベルｄｂ）を測定
し、透過損失を計算した。結果を表１に示す。試料Ｎ
ｏ．１−５は本発明の発泡樹脂の厚みを変化させた例で
ある。発泡倍率は計算上８−９倍狙いで混合し加熱後実
測した。損失係数は発泡後の樹脂厚が厚いほど高い値を
示し断熱性、プレス性も良好であった。遮音の透過損失
は発泡後厚い樹脂（Ｎｏ．５，６，７）が良好であっ
た。試料Ｎｏ．６は上層皮膜を行なわなかった例で本発
明試料Ｎｏ．２との比較出来る。発泡ガスが抜けてしま
い、孔の多い表面で損失係数、断熱性が劣る。試料Ｎ
ｏ．７−１０は発泡樹脂の厚みを一定とし、上層皮膜を
５−１００ミクロンに変えた本発明例である。Ｎｏ．７
−９はいずれもバランスの良い性能を示した、上層厚み
１００ミクロンのＮｏ．１０ではプレス性に対して影響
がでてくるためプレス性が低下した。Example 1 A cold-rolled steel sheet coil having a thickness of 0.8 mm was electrolytically degreased with an aqueous sodium orthosilicate solution, and then a commercially available undercoating chromate was applied in an amount of Cr equivalent of 30 milligrams per square meter and dried with hot air. Then, 5 g of a maleic acid-modified olefin adhesive was applied per square meter and 13
After heating to 0 ° C., a film of a low density polyethylene resin (LDPE) containing a foaming agent (azodicarboxylic acid amide) and a cross-linking agent mixed at different concentrations of foaming ratio was laminated and lightly pressed with a metal cooling roll. The surface was oxidized by adhering to an acid, and then a two-component bisphenol-type epoxy resin clear paint was applied and baked at 130 ° C. to produce a damping steel coil covered with a foamable resin. 2
Cut to 00 × 300mm to make an unfoamed sample,
After cutting to test size, 170-200 ° C in hot air electric furnace
Was heated for 25 minutes to cause foaming, and the loss coefficient due to mechanical impedance was measured at a temperature of 40 ° C. and a frequency of 300 Hz.
Further, the foamed resin surface was brought into contact with the surface of the steel sheet, and the steel sheet was heated by infrared rays from the opposite side to measure the rate of temperature rise of the steel sheet. Also, place the unfoamed sample on the resin side with a punch surface (diameter 100m).
As m), the ball head cup was squeezed and the breaking height was measured. The sound insulation is as follows: A 300 x 300 foamed sample is fitted on the mating surface of the anechoic box and the reverberation box with a volume of 0.25 cubic meters, the top box is closely attached, and the sound source is placed in the anechoic box. The transmission loss (dB) was measured and the transmission loss was calculated. Table 1 shows the results. Sample N
o. 1-5 is an example in which the thickness of the foamed resin of the present invention is changed. The expansion ratio was measured after mixing, heating and aiming at 8-9 times. The loss coefficient was higher as the resin thickness after foaming was larger, and the heat insulating properties and pressability were also good. Thick resin after foaming (Nos. 5, 6, and 7) had good transmission loss of sound insulation. Sample No. Sample No. 6 of the present invention is an example in which the upper layer coating was not performed. 2 can be compared. The foaming gas escapes, and the loss coefficient and heat insulation are poor on the surface with many holes. Sample N
o. 7-10 is an example of the present invention in which the thickness of the foamed resin is fixed and the upper layer film is changed to 5-100 microns. No. 7
No.-9 showed a well-balanced performance, and No. 9 having an upper layer thickness of 100 microns. In the case of No. 10, the pressability was reduced because the pressability was affected.

【００１１】[0011]

【表１Ａ】表１Ａ 実施例１の試験結果 [Table 1A] Test results of Example 1

【００１２】[0012]

【表１Ｂ】 [Table 1B]

【００１３】実施例２ 板厚０．８ｍｍの冷延鋼板コイルをオルソケイ酸ナトリ
ウム水溶液で電解脱脂後市販の塗装下地用クロメートを
Ｃｒ換算付着量として１平方メートル当り３０ミリグラ
ム塗布し熱風で乾燥したのち、マレイン酸変性のオレフ
ィン接着剤を１平方メートル当り５グラム塗布し１３０
℃に加熱し、加熱発泡剤（アゾジカルボン酸アミド）、
架橋剤を含むポリプロピレン樹脂（ＰＰ）のフィルムを
貼りあわせ、金属冷却ロールで軽圧着したのち、クロム
酸に接触させて表面を酸化し、ついでウレタン樹脂クリ
ヤー塗料を塗布し１３０℃に焼き付けて発泡性樹脂を被
覆した制振鋼板コイルを製造した。熱風式電気炉で２０
０−２５０℃に２５分加熱して発砲させ、実施例１に準
じて機械インピーダンスによる損失係数、昇温速度、球
頭カップ絞り破断高さ、透過損失（ｄｂ）を測定した。
結果を表２に示す。Example 2 A cold-rolled steel sheet coil having a thickness of 0.8 mm is electrolytically degreased with an aqueous sodium orthosilicate solution, and then a commercially available undercoating chromate is applied in an amount of Cr equivalent of 30 milligrams per square meter and dried with hot air. 5 g of maleic acid-modified olefin adhesive is applied per square meter and 130
℃, heated foaming agent (azodicarboxylic acid amide),
A film of a polypropylene resin (PP) containing a cross-linking agent is stuck and lightly pressed with a metal cooling roll. Then, the surface is oxidized by contacting with chromic acid, and then a urethane resin clear paint is applied and baked at 130 ° C to form a foam. Resin-coated damping steel coil was manufactured. 20 with hot-blast electric furnace
The mixture was heated at 0 to 250 ° C. for 25 minutes and fired, and a loss coefficient due to mechanical impedance, a temperature rising rate, a ball-head cup drawing break height, and a transmission loss (db) were measured in accordance with Example 1.
Table 2 shows the results.

【００１４】[0014]

【表２Ａ】実施例２の実験結果 [Table 2A] Experimental results of Example 2

【００１５】[0015]

【表２Ｂ】 [Table 2B]

【００１６】実施例３ 板厚０．８ｍｍの冷延鋼板コイルをオルソケイ酸ナトリ
ウム水溶液で電解脱脂後市販の塗装下地用クロメートを
Ｃｒ換算付着量として１平方メートル当り３０ミリグラ
ム塗布し熱風で乾燥したのち、マレイン酸変性のオレフ
ィン接着剤を１平方メートル当り５グラム（５μ）塗布
し１３０℃に加熱し、７倍発泡設計量の加熱発泡剤（ア
ゾジカルボン酸アミド）、架橋剤を含む５００ミクロン
のポリプロピレン樹脂（ＰＰ）のフィルムを貼り合わ
せ、金属冷却ロールで軽圧着したのち、クロム酸に接触
させて表面を酸化し、ついで潤滑剤としテフロン粒子を
分散したウレタンエポキシ樹脂塗料を乾燥膜厚狙いで１
０ミクロン塗布し１３０℃に焼き付け制振鋼板コイルを
製造した。熱風式電気炉で２００−２５０℃に２５分加
熱して発泡させ、実施例１に準じて評価した。機械イン
ピーダンスによる損失係数は０．１、昇温速度は０．０
２℃／分・ｍｍ、球頭カップ絞り破断高さは４９ｍｍ、
透過損失（ｄｂ）は３２ｄｂであり、良好な特性を示し
た。Example 3 A cold-rolled steel sheet coil having a thickness of 0.8 mm is electrolytically degreased with an aqueous sodium orthosilicate solution, and then a commercially available undercoating chromate is applied in an amount of Cr equivalent of 30 mg per square meter and dried with hot air. A maleic acid-modified olefin adhesive is applied at 5 g (5 μ) per square meter and heated to 130 ° C., and a 7-fold expanded design amount of a heating foaming agent (azodicarboxylic acid amide) and a 500 micron polypropylene resin containing a crosslinking agent ( PP) film is bonded and lightly pressed with a metal cooling roll, and then oxidized by contact with chromic acid. Then, a urethane epoxy resin paint containing Teflon particles dispersed as a lubricant is applied to a dry film thickness of 1 mm.
0 micron was applied and baked at 130 ° C. to produce a damping steel coil. The foam was heated by heating at 200 to 250 ° C. for 25 minutes in a hot-air electric furnace, and evaluated according to Example 1. The loss factor due to mechanical impedance is 0.1, and the heating rate is 0.0
2 ° C / min · mm, ball head cup drawing break height is 49mm,
The transmission loss (db) was 32 db, indicating good characteristics.

【００１７】[0017]

【発明の効果】本発明は制振鋼板の製造自体有利である
他に、自動車においては天井、床等の複雑なダンピング
シート構造を簡略化し生産性を上げ、車体重量の軽量化
に寄与する効果がある。また、組立後に加熱発泡させる
必要があるが、隙間部にも発泡樹脂が密に充填され断
熱、遮音性に優れ建材用資材として天井、壁、床等、に
適用でき工程を簡略化できる。The present invention exhibits in addition to advantageous production itself of the vibration damping steel plate, raising the ceiling, complex damping sheet structure is simplified productivity such as the floor in the automobile, which contributes to weight reduction of vehicle weight effect There is. In addition, although it is necessary to heat and foam after assembling, the gaps are densely filled with a foamed resin, which is excellent in heat insulation and sound insulation, and can be applied as a material for building materials to ceilings, walls, floors, etc., and the process can be simplified.

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

【図１】本発明の多機能軽量制振鋼板の断面を示した模
式図である。FIG. 1 is a schematic view showing a cross section of a multifunctional lightweight vibration-damping steel sheet of the present invention.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ１６Ｆ 15/02 Ｆ１６Ｆ 15/02 Ｑ (56)参考文献 特開 昭60−97842（ＪＰ，Ａ) 特開 昭63−319085（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B32B 15/08 B05B 7/14 B32B 7/02 101 B32B 27/18 B32B 31/00 F16F 15/02 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI F16F 15/02 F16F 15/02 Q (56) References JP-A-60-97842 (JP, A) JP-A-63-319085 ( JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B32B 15/08 B05B 7/14 B32B 7/02 101 B32B 27/18 B32B 31/00 F16F 15/02

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 鋼板もしくはめっき鋼板の表面に下層と
して膜厚５０〜７００ミクロンの加熱発泡剤入り樹脂を
装着し、上層として潤滑剤を含有する膜厚１００ミクロ
ン以下の熱硬化型樹脂塗料を被覆したことを特徴とする
加工性に優れた制振鋼板。 1. A steel sheet or a plated steel sheet is coated with a resin containing a heating foaming agent having a thickness of 50 to 700 microns as a lower layer and coated with a thermosetting resin paint containing a lubricant and having a thickness of 100 microns or less as an upper layer. Damping steel sheet with excellent workability, characterized by 【請求項２】 鋼板もしくはめっき鋼板の表面に接着剤
を塗布したのちドライ膜厚として５０〜７００ミクロン
の加熱発泡剤入り樹脂を融液、粉末、塗料もくしくフィ
ルムのいずれかの形で被覆し、さらにその上に熱硬化型
樹脂塗料をドライ膜厚として１００ミクロン以下塗布し
発泡剤の分解温度以下の温度で加熱することを特徴とす
る加工性に優れた制振鋼板の製造方法。 2. An adhesive is applied to the surface of a steel sheet or a plated steel sheet, and then a resin containing a heating foaming agent having a dry film thickness of 50 to 700 microns is coated in any form of a melt, a powder, a paint or a film. A method for producing a vibration-damping steel sheet having excellent workability , further comprising applying a thermosetting resin coating material thereon in a dry film thickness of 100 μm or less and heating at a temperature not higher than the decomposition temperature of the foaming agent. 【請求項３】 鋼板もしくはめっき鋼板の表面に接着剤
を塗布したのちドライ膜厚として５０〜７００ミクロン
の加熱発泡剤入り樹脂を融液、粉末、塗料もくしくフィ
ルムのいずれかの形で被覆し、さらにその上に潤滑剤を
含有する熱硬化型樹脂塗料をドライ膜厚として１００ミ
クロン以下塗布し発泡剤の分解温度以下の温度で加熱す
ることを特徴とする加工性に優れた制振鋼板の製造方
法。 3. An adhesive is applied to the surface of a steel sheet or a plated steel sheet, and then a resin containing a heating foaming agent having a dry film thickness of 50 to 700 microns is coated in any form of a melt, a powder, a paint or a film. and, further damping steel sheet excellent in workability characterized by heating a thermosetting resin paint containing a lubricant thereon at decomposition temperature below the temperature of the applied blowing agent 100 microns or less as a dry film thickness Manufacturing method.
JP3112249A 1991-04-18 1991-04-18 Damping steel sheet with excellent workability and its manufacturing method Expired - Lifetime JP2957303B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3112249A JP2957303B2 (en) 1991-04-18 1991-04-18 Damping steel sheet with excellent workability and its manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3112249A JP2957303B2 (en) 1991-04-18 1991-04-18 Damping steel sheet with excellent workability and its manufacturing method

Publications (2)

Publication Number Publication Date
JPH04319433A JPH04319433A (en) 1992-11-10
JP2957303B2 true JP2957303B2 (en) 1999-10-04

Family

ID=14581981

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2957303B2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3106120B2 (en) 1997-05-16 2000-11-06 三菱電機株式会社 Portable electronic devices
JP2006071090A (en) * 2004-01-13 2006-03-16 Sekisui Chem Co Ltd Vibration damping material
JP2007040515A (en) * 2005-03-08 2007-02-15 Sekisui Chem Co Ltd Vibration control structure of vibrating body, and its manufacturing method
JP2007021813A (en) * 2005-07-13 2007-02-01 Sekisui Chem Co Ltd Damping material
JP2007071347A (en) * 2005-09-08 2007-03-22 Sekisui Chem Co Ltd Vibration damping material
JP4890380B2 (en) * 2007-08-07 2012-03-07 トヨタ自動車株式会社 Multi-layer steel plate reinforcement
JP4751489B2 (en) * 2009-08-04 2011-08-17 新日本製鐵株式会社 Pre-coated metal plate

Also Published As

Publication number Publication date
JPH04319433A (en) 1992-11-10

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