JP4044816B2 - Water-based damping material - Google Patents
Water-based damping material Download PDFInfo
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- JP4044816B2 JP4044816B2 JP2002284427A JP2002284427A JP4044816B2 JP 4044816 B2 JP4044816 B2 JP 4044816B2 JP 2002284427 A JP2002284427 A JP 2002284427A JP 2002284427 A JP2002284427 A JP 2002284427A JP 4044816 B2 JP4044816 B2 JP 4044816B2
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- Prior art keywords
- damping material
- aqueous
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- vibration damping
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Description
【０００１】
【発明の属する技術分野】
本発明は、自動車のフロア、ダッシュ等の鋼板の制振材として用いるのに好適な水性制振材に関するもので、特に、焼き付けの際に膨れの生じない水性制振材に関するものである。
【０００２】
【従来の技術】
従来、この種の水性制振材としては、アクリルエマルションにゴムラテックスを混合した制振材等が知られている。
【０００３】
【発明が解決しようとする課題】
しかしながら、前記従来の水性制振材の場合には、焼き付けの際に被膜の表面に膨れが生じてしまい、制振性ばかりでなく、外観上も問題であった。また、雲母等の制振付与材の使用もできないものであった。
そこで、本発明は、焼き付けの際に膨れの生じない水性制振材を提供することを目的とする。
【０００４】
【課題を解決するための手段】
以上の目的を達成するため、本発明者等は鋭意検討の結果、水性エマルションベースに熱硬化性樹脂と加熱発泡剤を含ませることにより、焼き付けの際に膨れの生じない水性制振材が得られることを知見した。
即ち、水性エマルションベースに熱硬化性樹脂を含ませることにより、焼き付けの際に被膜表面に熱硬化性樹脂による硬い表面被膜が形成され、膨れが生じにくくなるとともに、加熱発泡剤を含ませることにより、焼き付けの際に加熱発泡剤が破裂することにより、被膜に亀裂を生じさせ、その亀裂から水分を逃がすことができ、水分コントロールが可能となり、これらの作用が相俟って、被膜表面に膨れが生じることが防止できるものと推察される。
本発明の水性制振材はかかる知見に基づきなされたもので、請求項１記載の通り、水性エマルション１００重量部に、熱硬化性樹脂３〜７重量部と、焼き付け時に破裂する加熱発泡剤２〜１１重量部を含ませてなり、前記熱硬化性樹脂は、フェノールアルデヒド樹脂、尿素樹脂、或いは、メラミン樹脂としたことを特徴とする。
また、請求項２記載の水性制振材は、請求項１記載の水性制振材において、前記加熱発泡剤を３〜１０重量部含ませてなることを特徴とする。
また、請求項３記載の水性制振材は、請求項１又は２に記載の水性制振材において、前記水性エマルションは、酢酸ビニルエマルション、エチレン酢ビエマルション、或いは、アクリルエマルションであることを特徴とする。
また、請求項４記載の水性制振材は、請求項１乃至３の何れかに記載の水性制振材において、前記加熱発泡剤は、低沸点炭化水素内包の加熱膨張カプセルであることを特徴とする。
【０００５】
【発明の実施の形態】
本発明の水性制振材は、水性エマルションベースに熱硬化性樹脂と加熱発泡剤を含ませてなることを特徴とするものであるが、前記水性エマルションとしては、酢酸ビニルエマルション、エチレン酢ビエマルション、或いは、アクリルエマルション等が使用される。
本発明水性制振材の使用温度領域を２０〜６０℃とした場合、ＴＧ３０〜３５℃の酢酸ビニルエマルション１０〜２０重量％にＴＧ３０〜５５℃のアクリル系エマルション９０〜８０重量％の割合で配合したものを用いるのが好ましい。
尚、酢酸ビニル系エマルションの場合は常温で成膜するが、アクリル系エマルションの場合は常温では成膜しないので、エマルション（液）１００重量部に対して２．５〜７．５重量部の造膜助剤を用いることが好ましく、プロピレングリコールなどの使用が好ましい。
【０００６】
前記水性エマルションに含ませる熱硬化性樹脂としては、フェノールアルデヒド樹脂、尿素樹脂、或いは、メラミン樹脂等が挙げられる。
このような熱硬化性樹脂は前記水性エマルション１００重量部に対して、３〜７重量部程度含ませるのが好ましい。これは３重量部未満では、膨れ防止の効果がなく、また、７重量部を超えるとエマルションの貯蔵安定性に関して粘度上昇が認められるからである。
【０００７】
前記水性エマルションに含ませる加熱発泡剤としては、メタン、プロパン、ブタン、イソブタン等の低沸点炭化水素内包の加熱膨張カプセル、具体的には、松本フェア Ｆ２０Ｄ、Ｆ３６、Ｆ５０（松本油脂製）等が挙げられる。
このような加熱発泡剤は前記水性エマルション１００重量部に対して、２〜１１重量部程度含ませるのが好ましい。これは２重量部未満では、膨れ防止効果が少なく、また、１１重量部を超えると、被着体との間で剥離が生じる恐れがあるからである。
【０００８】
前記熱硬化性樹脂と加熱発泡剤の働きによって焼き付け時の膨れ防止が可能となったことから、制振付与材料として既知の雲母等も大量に使用でき、また、クレー、タルク、グラファイト等の一般的な充填材の使用も可能である。
【０００９】
また、タレ防止材として、シリカ、セピオライト、ベントナイトの使用が好ましい。これら無機系のタレ防止材は膨れ対策上、好ましいものであるが、無機系タレ防止材の欠点を補うため、変性ポリエステル樹脂（ビスライザーＡＰ−２ 三洋化成製）、親水基に変性したポリエチレングリコールアミノプラスト共重合体（ホプティフロー ズードフェミー製）、ポリアクリレート類、セルロース類などの有機系タレ防止材を併用するようにしてもよい。
【００１０】
【実施例】
次に、本発明の水性制振材について、具体的な実施例に基づき説明する。
下記表１に示す配合割合の水性制振材を調整し、乾燥後の重さが４ｋｇ／ｍ2になるように、厚み１．６ｍｍの鋼板に１３０℃×１５分の条件で焼付けした。次いで、試験体の制振性を評価するため、共振法によって２００Ｈｚにて、２０℃、４０℃、６０℃の３点の温度での損失係数を測定し、その測定結果を下記表１に示した。
【００１１】
【表１】
表１から明らかなように、水性エマルション１００重量部に、熱硬化性樹脂３〜７重量部、加熱発泡剤２〜１１重量部を含ませた場合に、焼き付け時の膨れ防止効果が得られ、特に、前記発泡剤を３〜１０重量部を含ませた場合に極めて良好な焼き付け時の膨れ防止効果が得られることが明らかである。
【００１３】
【発明の効果】
以上説明した通り、本発明の水性制振材によれば、水性エマルションベースに熱硬化性樹脂と加熱発泡剤を併用することで、水による均一発泡を助けることになり、焼き付け時の膨れ防止効果が得られ、しかも、制振付与剤である雲母なども使用できることで、制振性の向上を図れるという効果が得られる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aqueous vibration damping material suitable for use as a vibration damping material for steel plates such as automobile floors and dashes, and more particularly to an aqueous vibration damping material that does not swell during baking.
[0002]
[Prior art]
Conventionally, as this type of aqueous vibration damping material, a vibration damping material in which a rubber latex is mixed with an acrylic emulsion is known.
[0003]
[Problems to be solved by the invention]
However, in the case of the conventional water-based vibration damping material, the surface of the coating is swollen during baking, and this is a problem not only in vibration damping properties but also in appearance. Further, it is impossible to use a vibration damping material such as mica.
Accordingly, an object of the present invention is to provide an aqueous vibration damping material that does not swell during baking.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, as a result of intensive studies, the present inventors have obtained an aqueous damping material that does not swell during baking by including a thermosetting resin and a heating foaming agent in the aqueous emulsion base. I found out that
That is, by including a thermosetting resin in the aqueous emulsion base, a hard surface film is formed on the surface of the film during baking, making it difficult to swell, and including a heating foaming agent. When the heating foaming agent ruptures during baking, cracks are generated in the coating, moisture can be released from the cracks, moisture control becomes possible, and these actions combine to swell on the coating surface. It is presumed that the occurrence of this can be prevented.
The aqueous vibration damping material of the present invention has been made on the basis of such knowledge. As claimed in claim 1, 3 to 7 parts by weight of a thermosetting resin and 100 parts by weight of an aqueous emulsion and a heating foaming agent 2 that bursts during baking. The thermosetting resin is a phenol aldehyde resin, a urea resin, or a melamine resin .
Further, the aqueous vibration damping material according to claim 2 is characterized in that 3 to 10 parts by weight of the heating foaming agent is included in the aqueous vibration damping material according to claim 1 .
Further, characterized in that an aqueous vibration damping material according to claim 3, wherein, in an aqueous vibration damping material according to claim 1 or 2, wherein the aqueous emulsion, vinyl acetate emulsion, ethylene acetate bi emulsion, or an acrylic emulsion And
The aqueous damping material according to claim 4 is the aqueous damping material according to any one of claims 1 to 3 , wherein the heating foaming agent is a heat-expandable capsule containing low-boiling hydrocarbons. And
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The aqueous vibration damping material of the present invention is characterized in that a thermosetting resin and a heating foaming agent are contained in an aqueous emulsion base. Examples of the aqueous emulsion include a vinyl acetate emulsion and an ethylene vinyl acetate emulsion. Alternatively, an acrylic emulsion or the like is used.
When the operating temperature range of the aqueous vibration damping material of the present invention is 20 to 60 ° C., it is blended at a ratio of 90 to 80% by weight of TG 30 to 55 ° C. acrylic emulsion to 10 to 20% by weight of vinyl acetate emulsion of TG 30 to 35 ° C. It is preferable to use the above.
In the case of a vinyl acetate emulsion, the film is formed at room temperature, but in the case of an acrylic emulsion, the film is not formed at room temperature, so that 2.5 to 7.5 parts by weight per 100 parts by weight of the emulsion (liquid) is prepared. It is preferable to use a film auxiliary agent, and it is preferable to use propylene glycol or the like.
[0006]
Examples of the thermosetting resin included in the aqueous emulsion include phenol aldehyde resin, urea resin, and melamine resin.
Such a thermosetting resin is preferably contained in an amount of about 3 to 7 parts by weight with respect to 100 parts by weight of the aqueous emulsion. This is because if it is less than 3 parts by weight, there is no effect of preventing swelling, and if it exceeds 7 parts by weight, an increase in viscosity is recognized with respect to the storage stability of the emulsion.
[0007]
Examples of the heating foaming agent contained in the aqueous emulsion include heating expansion capsules containing low-boiling hydrocarbons such as methane, propane, butane, and isobutane, specifically Matsumoto Fair F20D, F36, F50 (made by Matsumoto Yushi). Can be mentioned.
Such a heating foaming agent is preferably contained in an amount of about 2 to 11 parts by weight with respect to 100 parts by weight of the aqueous emulsion. This is because if the amount is less than 2 parts by weight, the effect of preventing swelling is small, and if the amount exceeds 11 parts by weight, there is a risk of peeling between the adherend.
[0008]
Since the thermosetting resin and the heating foaming agent can prevent blistering during baking, a known amount of mica can be used as a vibration damping material, and clay, talc, graphite, etc. The use of typical fillers is also possible.
[0009]
Further, it is preferable to use silica, sepiolite, or bentonite as the sagging prevention material. These inorganic sagging prevention materials are preferable in terms of countermeasures against swelling, but in order to compensate for the disadvantages of the inorganic sagging prevention materials, modified polyester resins (Bilyzer AP-2 manufactured by Sanyo Kasei), polyethylene glycol modified with hydrophilic groups An organic anti-sagging material such as an aminoplast copolymer (manufactured by Hopty Frozen Femmy), polyacrylates and celluloses may be used in combination.
[0010]
【Example】
Next, the aqueous vibration damping material of the present invention will be described based on specific examples.
The aqueous damping material having a blending ratio shown in Table 1 below was prepared and baked on a steel plate having a thickness of 1.6 mm at 130 ° C. for 15 minutes so that the weight after drying was 4 kg / m 2 . Next, in order to evaluate the vibration damping properties of the test specimen, loss factors at three temperatures of 20 ° C., 40 ° C., and 60 ° C. were measured at 200 Hz by the resonance method, and the measurement results are shown in Table 1 below. It was.
[0011]
[Table 1]
As is apparent from Table 1, when 100 parts by weight of the aqueous emulsion contains 3 to 7 parts by weight of a thermosetting resin and 2 to 11 parts by weight of a heating foaming agent, an effect of preventing blistering during baking is obtained. In particular, when 3 to 10 parts by weight of the foaming agent is included, it is clear that an extremely good blistering prevention effect can be obtained.
[0013]
【The invention's effect】
As described above, according to the aqueous vibration damping material of the present invention, by using a thermosetting resin and a heating foaming agent in combination with an aqueous emulsion base, it helps uniform foaming with water, and prevents swelling during baking. In addition, the use of mica, which is a vibration damping imparting agent, provides an effect of improving vibration damping properties.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002284427A JP4044816B2 (en) | 2002-09-27 | 2002-09-27 | Water-based damping material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002284427A JP4044816B2 (en) | 2002-09-27 | 2002-09-27 | Water-based damping material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004115740A JP2004115740A (en) | 2004-04-15 |
| JP4044816B2 true JP4044816B2 (en) | 2008-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002284427A Expired - Fee Related JP4044816B2 (en) | 2002-09-27 | 2002-09-27 | Water-based damping material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4044816B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006335938A (en) * | 2005-06-03 | 2006-12-14 | Dainippon Ink & Chem Inc | Aqueous acrylic emulsion and foaming vibration-damping paint and damping body |
| JP2010235888A (en) * | 2009-03-31 | 2010-10-21 | Cci Corp | Vibration damping composition |
| JP6435065B1 (en) | 2018-01-17 | 2018-12-05 | サイデン化学株式会社 | Resin emulsion for damping paint, damping paint, and method for producing resin emulsion for damping paint |
-
2002
- 2002-09-27 JP JP2002284427A patent/JP4044816B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004115740A (en) | 2004-04-15 |
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