JP4092415B2 - Damping material - Google Patents

Description

得られた各例の制振シートについて損失係数（η）、及びそのピーク温度を測定し、その結果を図４に示した。尚、各制振シートについての損失係数（η）の測定は、小野測器株式会社製の中央加振法損失係数測定装置（ＣＦ５２００タイプ）を用いて各々行った。
【００２９】
図４から、比較例１に係る制振シートの損失係数（η）のピークが約１０℃となっていたのに対し、ＥＭとＳＢＲをベース材料として用いた実施例１の制振シートの損失係数（η）のピークは約１３℃、実施例２の制振シートの損失係数（η）のピークは約１７℃であった。
【００３０】
また、比較例１に係る制振シートの損失係数（η）のピークは、約０．１７となっていたのに対し、ＥＭとＳＢＲをベース材料として用いた実施例１及び２の制振シートの損失係数（η）のピークはいずれも約０．１９であった。
【００３１】
さらに実施例１の制振シートと実施例２の制振シートの損失係数（η）を見てみると、いずれも同一レベルの性能であって、その性能の幅も同程度であった。
【００３２】
このことから、ＥＭとＳＢＲをベース材料とする制振材料では、活性成分の配合量を調整することで、当該制振材料の損失係数（η）のピーク温度をマイナス方向へ或いはプラス方向に移動させることができるということが確認された。
【００３３】
【発明の効果】
本発明の制振材料にあっては、ＥＭにＳＢＲを混合した混合物をベース材料とすると共に、前記ベース材料１００重量部に対し、３０〜８０重量部の割合で前記ベース材料における双極子モーメント量を増加させる、、ベンゾチアジル基を持つ化合物、ベンゾトリアゾール基を持つ化合物、ジフェニルアクリレート基を持つ化合物、及びベンゾフェノン基を持つ化合物の中から選ばれた１種若しくは２種以上からなる活性成分を配合したことにより、優れた制振性能を有すると共に、当該制振材料の用途や使用状態に応じて制振性能の発揮される温度を適宜調節することができる。
【図面の簡単な説明】
【図１】ベース材料における双極子を示した模式図である。
【図２】エネルギーが加わったときのベース材料における双極子の状態を示した模式図。
【図３】活性成分が配合されたときのベース材料における双極子の状態を示した模式図。
【図４】ベース材料中にＤＣＨＢＳＡを配合した制振材料（実施例１及び２）と未配合の制振材料（比較例１）の温度と損失係数との関係を示したグラフ。
【符号の説明】
１１・・・ベース材料
１２・・・双極子[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to automobiles, home appliances, precision equipment, construction machines, civil engineering buildings, and other various machines, equipment, building structures, etc., and propagates to the machines, equipment, structures, etc. The present invention relates to a vibration damping material that can effectively absorb and dampen vibration generated from a structure or the like. Specifically, the present invention relates to a vibration damping material that has excellent vibration damping performance and can appropriately adjust the temperature at which the vibration damping performance is exhibited according to the application and use state of the vibration damping material.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, materials with viscoelastic properties such as asphalt and vinyl chloride resin (such as asphalt and vinyl chloride resin) have been used as vibration countermeasures for automobiles, home appliances, precision equipment, construction machinery, civil engineering buildings, and other various machines, equipment, and building structures ( A damping material) is adhered to the application site of the machine, device, structure, etc., and is propagated to the machine, device, structure, etc., or absorbs and attenuates vibration generated from the machine, device, structure, etc. It was.
[0003]
However, this damping material is used at around room temperature (-5 to 30 ° C) in applications such as automobiles, home appliances, precision equipment, construction machinery, civil engineering buildings, and other various machines, equipment, and building structures. On the other hand, since the glass transition points of asphalt and vinyl chloride resin are both lower than that, there is a problem that sufficient performance is not exhibited in the operating temperature range.
[0004]
The present invention relates to an improvement of a conventional vibration damping material, and has an excellent vibration damping performance, and appropriately adjusts the temperature at which the vibration damping performance is exhibited according to the use and use state of the vibration damping material. An object of the present invention is to provide a vibration damping material that can be used.
[0005]
[Means for Solving the Problems]
That is, the vibration damping material of the present invention uses as a base material a mixture obtained by mixing an ethylene methacrylic acid polymer (hereinafter referred to as EM) with styrene-butadiene rubber (hereinafter referred to as SBR), and the base material 100 described above. A compound having a benzothiazyl group, a compound having a benzotriazole group, a compound having a diphenyl acrylate group, and a benzophenone group, which increases the amount of dipole moment in the base material at a ratio of 30 to 80 parts by weight with respect to parts by weight. The active ingredient which consists of 1 type (s) or 2 or more types chosen from the compound was mix | blended.
[0006]
Examples of the EM constituting the base material include ethylene, methacrylic acid, methacrylic acid ester, methyl methacrylate, isobutyl methacrylate, methacrylic acid chloride, diethylaminoethyl methacrylate, dimethylaminoethyl methacrylate, N-butyl methacrylate, methacrylic acid. Mention may be made of copolymers with lauryl acid, glycidyl methacrylate, and 2-hydroxyethyl methacrylate.
[0007]
Similarly, the SBR constituting the base material is a copolymer of butadiene and styrene as is well known, and is a component that imparts flexibility to the EM and improves the workability of the vibration damping material. This SBR has many grades with different blending ratios of butadiene and styrene. Among them, those having high flexibility and rubber elasticity, and those having an amount of styrene exceeding 45% are desirable.
[0008]
The mixing ratio of the EM and SBR is not particularly limited, but a range of 1: 1 to 15: 1 is preferable. Among EM and SBR, if the mixing ratio of EM increases, the flexibility and workability of the damping material will decrease. If the SBR ratio increases, the flexibility and workability will increase, but the operating temperature range There is a risk of deteriorating vibration damping performance at the site.
[0009]
Of the above base materials, which base material is used as the damping material depends on the use and usage of automobiles, home appliances, precision equipment, construction machinery, civil engineering buildings, and other various machines, equipment, and structures. It may be determined appropriately in consideration of handling, availability, temperature performance (heat resistance and cold resistance), weather resistance, price, and the like.
[0010]
The vibration damping material of the present invention has an effect (effect 1) of exhibiting excellent vibration damping performance that has never been achieved by including an active component described later. In addition, the damping material can be appropriately adjusted to a temperature at which the damping performance is most exerted by appropriately adjusting the blending amount of the active ingredient in the base material according to the use and use state of the damping material. (Effect 2).
[0011]
First, the effect 1 produced by including an active ingredient is demonstrated.
[0012]
An active component is a component that dramatically increases the amount of dipole moment in the base material. The active component itself has a large dipole moment amount, or the active component itself has a small dipole moment amount. By blending an active ingredient, it refers to a component that can dramatically increase the amount of dipole moment in the base material.
[0013]
Hereinafter, the relationship between the amount of dipole moment in the base material and the damping performance will be described. FIG. 1 shows an arrangement state of the dipole 12 inside the base material 11 before vibration energy (hereinafter simply referred to as energy) is transmitted. It can be said that the arrangement state of the dipole 12 is in a stable state.
[0014]
However, when energy is transmitted, the dipole 12 existing inside the base material 11 is displaced, and each dipole 12 inside the base material 11 is placed in an unstable state as shown in FIG. As a result, each dipole 12 attempts to return to a stable state as shown in FIG.
[0015]
At this time, energy consumption occurs. It is considered that energy is absorbed through the displacement of the dipole inside the base material 11 and the energy consumption due to the restoring action of the dipole. Note that the occurrence of displacement in the dipole 12 means that each dipole 12 inside the base material 11 rotates or the phase shifts.
[0016]
From such a vibration damping mechanism, as the amount of dipole moment in the base material 11 as shown in FIGS. 1 and 2 increases, the damping property (damping performance) of the base material 11 also increases. It is considered to be.
[0017]
When the active ingredient is blended with the base material, the amount of dipole moment generated in the base material 11 is 3 times or 10 times under the same temperature and energy conditions as shown in FIG. Has the ability to increase in quantity. Along with this, the energy consumption due to the restoring action of the dipole when energy is transmitted will also increase dramatically, and it is considered that vibration absorption performance far exceeding prediction will occur.
[0018]
Examples of active ingredients that lead to such action and effects include N, N-dicyclohexylbenzothiazyl-2-sulfenamide (DCHBSA), 2-mercaptobenzothiazole (MBT), dibenzothiazyl sulfide (MBTS), N- Cyclohexylbenzothiazyl-2-sulfenamide (CBS), N-tert-butylbenzothiazyl-2-sulfenamide (BBS), N-oxydiethylenebenzothiazyl-2-sulfenamide (OBS), N , N-diisopropylbenzothiazyl-2-sulfenamide (DPBS) and other compounds having a benzothiazyl group, benzotriazole having an azole group bonded to the benzene ring as a parent nucleus, and 2- {2 having a phenyl group bonded thereto '-Hydroxy-3'-(3 ", 4", 5 ", 6" tetra Idrophthalimidomethyl) -5'-methylphenyl} -benzotriazole (2HPMMB), 2- {2'-hydroxy-5'-methylphenyl} -benzotriazole (2HMPB), 2- {2'-hydroxy-3'- t-butyl-5'-methylphenyl} -5-chlorobenzotriazole (2HBMPCB), 2- {2'-hydroxy-3 ', 5'-di-t-butylphenyl} -5-chlorobenzotriazole (2HDBPCB) Compounds having a benzotriazole group such as, compounds having a diphenyl acrylate group such as ethyl-2-cyano-3,3-diphenyl acrylate, or 2-hydroxy-4-methoxybenzophenone (HMBP), 2-hydroxy-4 -Methoxybenzophenone-5-sulfonic It can include one or more selected from among compounds having a benzophenone group, such as Sid (HMBPS).
[0019]
The blending amount of the active ingredient for leading the above-described excellent vibration damping performance is desirably 10 to 90 parts by weight with respect to 100 parts by weight of the base material. When the range of the amount of the active ingredient is, for example, less than 10 parts by weight, a sufficient effect of blending the active ingredient to increase the amount of dipole moment cannot be obtained. The active ingredient may not be sufficiently compatible with the base material.
[0020]
Next, the effect 2 that can be appropriately adjusted to a temperature at which the vibration damping performance is most exerted according to the use and use state of the vibration damping material by appropriately adjusting the blending amount of the active ingredient will be described.
[0021]
Damping materials are applied in a wide range of fields such as automobiles, interior materials, building materials, and home appliances. Therefore, vibration absorption performance (energy) It can be said that one of the important conditions for producing the vibration damping material is to make the damping property of the most effective.
[0022]
In the vibration damping material of the present invention, by appropriately adjusting the blending amount of the active ingredient in the base material, the temperature can be adjusted appropriately to the temperature at which the vibration damping performance is most exerted depending on the application and use state. ing.
[0023]
That is, the temperature at which the damping performance of the damping material is most exhibited (so-called peak temperature) by appropriately adjusting the blending amount of the active ingredient within a range of 30 to 80 parts by weight with respect to 100 parts by weight of the base material. Can be adjusted to a range of 10 ° C to 30 ° C.
[0024]
For example, when the amount of the active ingredient is out of the range of 30 to 80 parts by weight, if the range is in the range of 10 to 90 parts by weight with respect to 100 parts by weight of the base material, excellent vibration damping performance can be obtained. However, the function of adjusting the peak temperature due to the incorporation of the active ingredient does not occur. If the range of 10 to 90 parts by weight is also exceeded, it becomes impossible to obtain excellent vibration damping performance and to adjust the peak temperature.
[0025]
In determining the active ingredient to be blended in the base material, it is preferable to select the one having a close value in consideration of the compatibility between the active ingredient and the base material, that is, the SP value.
[0026]
In addition to the active ingredient, the base material is filled with fillers such as mica scale pieces, glass pieces, glass fibers, carbon fibers, calcium carbonate, barite, and precipitated barium sulfate in addition to the active components. be able to. Moreover, a coloring agent and a flame retardant can also be mix | blended as needed.
[0027]
The vibration damping material of the present invention can be obtained by blending the base material, the active ingredient, and the filler. In this case, a conventionally known melting material such as a heat roll, a Banbury mixer, a twin-screw kneader, or an extruder is used. A mixing device can be used.
[0028]
【Example】
The base material is a mixture of EM (Nucrel AN4213C, Mitsui DuPont Polychemical Co., Ltd.) and SBR (NIPOL9529 (styrene content: 45% by weight), Nippon Zeon Co., Ltd.). DZ, manufactured by Sanshin Chemical Industry Co., Ltd.), mica scales (clarite mica, manufactured by Kuraray Co., Ltd.), and a flame retardant are blended as shown in Table 1 below, kneaded, and a sheet having a thickness of 0.8 mm. Molded into.
[Table 1]

The loss factor (η) and the peak temperature of each of the obtained vibration damping sheets were measured, and the results are shown in FIG. In addition, the measurement of the loss factor ((eta)) about each damping sheet was performed using the central excitation method loss factor measuring apparatus (CF5200 type) by Ono Sokki Co., Ltd., respectively.
[0029]
From FIG. 4, the loss factor (η) peak of the damping sheet according to Comparative Example 1 was about 10 ° C., whereas the loss of the damping sheet of Example 1 using EM and SBR as the base materials. The peak of the coefficient (η) was about 13 ° C., and the peak of the loss coefficient (η) of the vibration damping sheet of Example 2 was about 17 ° C.
[0030]
The peak of the loss factor (η) of the vibration damping sheet according to Comparative Example 1 was about 0.17, whereas the vibration damping sheets of Examples 1 and 2 using EM and SBR as base materials The peak of the loss coefficient (η) was about 0.19.
[0031]
Further, when looking at the loss coefficient (η) of the vibration damping sheet of Example 1 and the vibration damping sheet of Example 2, they all had the same level of performance, and the width of the performance was similar.
[0032]
Therefore, in the damping material based on EM and SBR, the peak temperature of the loss factor (η) of the damping material is moved in the minus direction or the plus direction by adjusting the amount of the active ingredient. It was confirmed that it can be made.
[0033]
【The invention's effect】
In the vibration damping material of the present invention, a mixture of EM and SBR is used as a base material, and a dipole moment amount in the base material is 30 to 80 parts by weight with respect to 100 parts by weight of the base material. Formulated with one or more active ingredients selected from a compound having a benzothiazyl group, a compound having a benzotriazole group, a compound having a diphenyl acrylate group, and a compound having a benzophenone group As a result, the temperature at which the damping performance is exhibited can be appropriately adjusted according to the application and use state of the damping material while having excellent damping performance.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a dipole in a base material.
FIG. 2 is a schematic diagram showing a state of a dipole in a base material when energy is applied.
FIG. 3 is a schematic diagram showing a dipole state in a base material when an active ingredient is blended.
FIG. 4 is a graph showing the relationship between the temperature and loss factor of a damping material (Examples 1 and 2) in which DCHBSA is blended in a base material and an unblended damping material (Comparative Example 1).
[Explanation of symbols]
11 ... Base material 12 ... Dipole

Claims (2)

A mixture obtained by mixing a styrene-butadiene rubber with an ethylene methacrylic acid polymer is used as a base material, and the amount of dipole moment in the base material is increased at a rate of 30 to 80 parts by weight with respect to 100 parts by weight of the base material . A compound having one or more active ingredients selected from a compound having a benzothiazyl group, a compound having a benzotriazole group, a compound having a diphenyl acrylate group, and a compound having a benzophenone group Damping material. 2. The vibration damping material according to claim 1, wherein a base material is a mixture obtained by mixing ethylene methacrylate polymer with styrene-butadiene rubber in a ratio of 1: 1 to 15: 1 .

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