JP2940719B2 - Vehicle damping structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is, floor panel of a vehicle or the like, dash panel, wheel house, the ceiling panel or the like (hereinafter
Below, it is described as "vehicle panel". The present invention relates to a vibration damping structure for a vehicle which is integrated by fusion molding on a substrate which is easily vibrated.

[0002]

2. Description of the Related Art A vibration substrate such as a floor panel , a dash panel , a wheel house , or a ceiling panel of a vehicle or the like is often used by fusing a heat-fusible damping material mainly composed of asphalt. Further, the steel sheet as a constraint member to the upper surface of the asphalt-based damping material in recent years, a metal sheet of aluminum plate or the like is provided, or epoxy resin, diallyl phthalate resin, constrained vibration damping by laminating a thermosetting resin such as an acrylic resin Improvement of vibration damping performance is also being performed as a structure. More recently, attempts have been made to improve the damping performance by foaming a damping material containing asphalt as a main component. However, these vibration damping structures have the following problems. In other words, in a double-layer type vibration damping structure in which the vibration substrate is damped only with a heat-fusible damping sheet mainly composed of asphalt or the like, it is necessary to increase the thickness in order to improve the damping performance. This results in the disadvantage of increasing the weight of the vehicle.
Also, this asphalt-based damping material is made of foam,
Although the technique for suppressing the weight increase has recently been widely used, the improvement in vibration damping performance in a practical weight range is not great. Further, in order to contact the steel plate on the asphalt-based damping material, a metal sheet of aluminum plate or the like having high rigidity metal plate as a constraint material heat-fusible damping material on, for example, high rigidity vibration infrastructure such as a steel plate Mechanically fixed to
Alternatively, it is necessary to fix by a method such as screwing using a bolt or the like. However, floor panels and the like of vehicles and the like are generally press-formed in an uneven shape to impart rigidity, so it is necessary to form a restraining metal sheet in a shape complementary to this, and an extra process is required. In addition, there is a problem that it is not easy to correctly position a predetermined position when mounting.

Further, a method of placing an uncured thermosetting resin on a vibration damping material, curing it in a coating drying process and using it as a restraining material, or a thermoplastic resin using a tackifier resin or the like as a base material. There is also a method in which a resin is placed on a damping material and is thermally fused in a coating drying step to be used as a restraining material. The method of using these hard resin materials as the restraint material is certainly effective in improving the vibration damping performance, but still does not significantly increase the weight from the viewpoint of recent noise reduction in the vehicle interior. At present, there is a shortage in the range of improvement in vibration damping performance when resin constraining materials are used within a practical range.

[0004]

SUMMARY OF THE INVENTION In order to solve these problems, the present inventors have first prepared a composition comprising a vinyl chloride resin for a paste, a plasticizer, a foaming agent and the like by adding a liquid ethoxy resin and a heat-activated resin. It has been proposed as a so-called thermosetting foamed damping structure with a foamed spacer (Japanese Patent Application No. 2-75495 ) using a foamable semi-gelled sheet containing a curing agent as a spacer. However, since the composition contains a vinyl chloride resin, there is a problem that the resin may be thermally decomposed at a high temperature such as an electrodeposition coating process in an automobile production line. there were. Under these circumstances, the present invention provides a vehicle structure that is lightweight and imparts high damping performance, and has good heat resistance, for example, a composition that can withstand the electrodeposition coating process. It is an object of the present invention to provide a vibration damping structure with a thermosetting foamed spacer comprising:

[0005]

According to the present invention, there is provided a viscoelastic
Damping sheet (2) made of material and foamable thermosetting resin sheet
Two layers consisting of a spacer sheet (1) consisting of
A laminate having a structure, wherein the spacer sheet (1)
(A) 100 parts by weight of an epoxy resin having one or more epoxy groups in one molecule, (B) more than 0.5 part by weight and less than 20 parts by weight of a co-reactive curing agent for an epoxy resin, (C)
0.5-fold foaming agent with a decomposition gas generation temperature of 100 to 220 ° C
More than 20 parts by weight, (D) surfactant 0.0
More than 5 parts by weight and less than 5 parts by weight, and (E) a rubber elastic material that is insoluble in the epoxy resin at room temperature and miscible and dispersible with the epoxy resin at a temperature of 80 to 150 ° C., or the epoxy resin at room temperature Over 10 parts by weight of at least one selected from powdery thermoplastic resins insoluble in water, containing no halogen and having an average particle size of 150 μm or less
The semi-gel was formed by heating at a temperature not higher than the decomposition gas generation temperature of the foaming agent (C) containing less than a part by mass.
A vibration damping structure for a vehicle, which is a seat, is provided.

Further, according to the present invention, drive both panels and the like which can impart an excellent damping performance within a range weight increase of the vehicle is small by making the structure integral vibration substrate and the fusion of the vehicle Can be manufactured. In addition, this type of vehicle structure needs to be brought into close contact with the uneven vibration substrate by heat treatment in the drying process such as painting, and the reaction , foaming , and fusion of each layer must be completed. However, a material with little decrease in physical properties is required as a preferable property, but the structure according to the present invention correctly meets these requirements.

Hereinafter, each constituent layer according to the present invention will be described. The spacer sheet (1) used in the present invention is made of a foamable thermosetting resin sheet . The preferred properties of the spacer sheet in the vehicle vibration damping structure are that it is lightweight, has high rigidity, has little change in physical properties due to temperature changes, and is closely adhered and fixed to a vibrating substrate that has irregularities in the coating and drying process. Is to have a foaming action. To prepare such a spacer sheet (1),
The composition to be produced (hereinafter, referred to as “spacer composition”)
In the above, the epoxy resin used as the component (A) is a liquid epoxy resin having one or more epoxy groups in the molecule.
Xy resin. These include, for example , glycidyl ethers based on bisphenol A , bisphenol F or resorcin, polyglycidyl ethers of phenol novolak resins or cresol novolak resins, glycidyl ethers of hydrogenated bisphenol A , glycidylamine type , linear aliphatic Epoxide type , glycidyl ether of phthalic acid , hexahydrophthalic acid or tetrahydrophthalic acid, etc., with a preferable ethoxy equivalent of 100 to 300. These epoxy resins may be used alone or in combination of two or more. In order to impart toughness to the obtained foam, ethylene oxide or propylene oxide-added phenol A type epoxy is used. A flexible epoxy resin such as a resin , a dimer acid type epoxy resin , and an ethoxy-modified NBR may be used in combination.

[0008]The spacer compositionIn the above, the component (B)
Is used as a co-reactive curing agent for epoxy resin. This
Exothermic peak temperature in combination with epoxy resin
Preferably, the temperature is in the range of 100 to 200 ° C.
For example, dicyandiamide,
4,4'-diaminodiphenylsulfone,2-n-
Imidazole induction, such as heptadecyl imidazole
, Isophthalic dihydrazide, N, N-dialkylthio
No acid such as urea derivatives and tetrahydrophthalic anhydride
Water, isophoronediamine, m-phenylenediamine,
N-aminoethylpiperazine, boric acid trifluoride complex
Products, trisdimethylaminomethylphenol, etc.
Can be One of these curing agents may be used,
Two or more types may be used in combination, and their addition
The amount is equivalent to 100 parts by weight of the epoxy resin of the component (A).
OrMore than 0.5 parts by weight and less than 20 parts by weightIn the range
You. If the amount is less than 0.5 parts by weight, curing is insufficient and foaming occurs.
Insufficient rigidity of the body, and if it exceeds 20 parts by weight,
However, the rigidity of the foam does not improve, which is economically disadvantageous.
You. The curing temperature here means that the epoxy resin and the curing agent
Heat the mixture at room temperature with an oil bath or heater
When heated, the heat generated by curing will peak.
Refers to the temperature of the medium. Also, depending on the heating conditions
Pre-tested combination and amount of epoxy resin and curing agent
Can be easily determined. In the present invention
Together with the curing agent (B),
For example, alcohol-based curing accelerators,Phenol
system,Mercaptan type,Dimethyl urea,Aliphatic,Sa
Such as imidazole, monuron, chlorotoluene, etc.
Can be used.

[0009]The above spacer compositionIn the (C)
The high temperature component where the decomposition gas generation temperature is 100 to 220 ° C
A release foaming agent is used. Such high-temperature decomposition type foaming agent
As an organic blowing agent,Inorganic foaming agent,High temperature expansion type microphone
Locabus cells and the like can be used. This decomposition gas
If the generation temperature is 100 ° C or lower, it will be described later.Semi-gelled
SheetFoaming starts in the processing of
Occasionally, the resin is insufficiently melted, causing outgassing,
Doesn't grow or gives a homogeneous foam
Peg. Further, when the temperature exceeds 220 ° C., the processing temperature of the composition
Of high quality and deterioration of resin
It is difficult to obtain foam. As such organic foaming agents,
For example, azodicarbonamide,p-toluenesulfonyl
Hydrazide,Dinitrosopentamethylenetetramine,
4,4'-oxybisbenzenesulfonyl hydrazide
And so on. The decomposition temperature of these organic blowing agents
Element, zinc compound, lead compound, etc.
It can be easily adjusted. Also, as an inorganic foaming agent
Is, for example, sodium bicarbonate,Sodium borohydride
Is a high-temperature expansion type microcapsule
Encapsulates low boiling hydrocarbons with vinylidene chloride resin
And the like.

In the present invention, any of the above-mentioned organic foaming agents, inorganic foaming agents, and high-temperature-expandable microcapsules can be used. However, from the viewpoints of expansion ratio, economy, etc., organic foaming agents are suitable. . These foaming agents may be used alone or in combination of two or more.
The addition amount is selected in the range of more than 0.5 parts by weight and less than 15 parts by weight per 100 parts by weight of the liquid ethoxy resin (A). If the amount is less than 0.5 part by weight, the foaming becomes insufficient. If the amount exceeds 15 parts by weight, the expansion ratio is not improved in spite of the amount, and in many cases, problems such as roughening of the foamed cells occur. In order for these foam cells to obtain a dense foam having a uniform cell diameter and a rigid cell membrane, it is advantageous that the particles of the foaming agent have a small particle size, for example, 0.1 to 0. In order to obtain a foam having a cell diameter of about 0.6 mm, preferably about 0.3 mm, the particle diameter should be 20 μm or less,
Preferably, it is 10 μm or less and uniform. In the present invention, a foaming accelerator can be used, if necessary, together with the foaming agent. Examples of the foaming accelerator include calcium stearate , barium stearate , sodium and potassium compounds, and urea.

In the spacer composition , a surfactant is used as the component (D). The surfactant, originating
It has a role of improving the structure of the foam cell (hereinafter, referred to as “cell structure”) . The surfactant, such as sodium lauryl sulfate, alkyl sulfate ester salts such as sodium myristyl sulfate, sodium dodecyl benzene sulfonate, alkyl aryl sulfonates such as potassium dodecyl benzene sulfonate, sodium dioctyl sulfosuccinic acid, sulfosuccinic acid ester salts such as dihexyl sulfoxylate sodium succinate, ammonium lauryl acid, fatty acid salts such as potassium stearate, polyoxyethylene aryl sulfates, can be exemplified preferably anionic surfactants such as rosin acid salt further sorbitan monooleate, sorbitan esters such as polyoxyethylene sorbitan monostearate, polyoxyethylene ethers, polyoxyethylene alkyl off Vinyl ether, polyoxyethylene alkyl esters of nonionic surfactants and cetyl pyridinium chloride, cationic surfactants such as cetyltrimethylammonium bromide may also be used. These surfactants may be used alone or in combination of two or more. The amount of addition exceeds 0.05 parts by weight per 100 parts by weight of the liquid epoxy resin (A).
It is selected in an amount of less than 5 parts by weight, preferably in the range of 0.2 to 3 parts by weight. If the amount is less than 0.05 part by weight, it cannot play a role of improving the cell structure. Even if the amount is more than 3 parts by weight, the stability of the cell is not improved for the amount. It may cause coloring due to decomposition. As a method for adding the surfactant, when the rubber elastic body or the thermoplastic resin used as the component (E) is in a powder form, it is advantageous to spray and uniformly dry-adsorb it before use.

The component (E) of the spacer composition is insoluble in the epoxy resin (A) at room temperature, and
A rubber elastic material that is miscible and dispersible with the epoxy resin at a temperature of about 150 ° C. or insoluble in the epoxy resin at room temperature ;
Powder-like heat-free, containing no logen and having an average particle size of 150 μm or less
At least one selected from plastic resins can be used. In this case, not only a solid but also a viscous liquid can be used as the rubber elastic body. On the other hand, it is necessary to use a thermoplastic resin composition having an average particle diameter of 150 μm or less as a powder. When the composition is heated to 150 ° C. or higher, the rubber elastic body or the thermoplastic resin is melted to form a homogeneous affinity with the epoxy resin (A), and the melt viscosity of the composition is maintained stably. Things are desirable. Such materials include rubber elastic materials such as chloroprene rubber , butadiene-acrylonitrile rubber , carboxyl-modified butadiene-acrylonitrile rubber , epoxy-modified butadiene-acrylonitrile rubber , butadiene rubber , isoprene rubber, ethylene-vinyl acetate copolymer, and polyphenylene. Ether , ethylene-vinyl alcohol copolymer , acrylonitrile-styrene copolymer , polyamide , polyvinyl butyral , polyvinyl acetal ,
Examples thereof include polymethyl methacrylate , acrylonitrile-butadiene-styrene copolymer , methyl methacrylate-butadiene-styrene copolymer, and polystyrene. These may be used alone or in combination of two or more. The component (E) is a spacer
-Having the function of adjusting the melt viscosity of the composition ,
It also has a function of improving the toughness of the obtained foam.
The amount of the component (E) added is more than 10 parts by weight and 200 parts by weight per 100 parts by weight of the liquid epoxy resin of the component (A).
It is selected in a range of less than parts by weight . Depending on the type of rubber elastic material or thermoplastic resin containing no halogen,
At 10 parts by weight or less, there is no function of adjusting the melt viscosity or the function of improving the toughness of the foam. Conversely, at 200 parts by weight or more,
This also depends on the type of the rubber elastic body or the thermoplastic resin, but disadvantages arise in that the expansion ratio of the foam is not improved or the rigidity of the foam is reduced.

In the composition of the present invention, it is important to balance the affinity between the epoxy resin (A) and the rubber elastomer or thermoplastic resin (E), and the type and molecular weight of the component (E). , it is necessary to appropriately select the particle size, amount and the like. In particular, regarding the affinity balance, a system in which the polymers are completely compatible with each other during melting is not preferable,
It is desirable to be in a stable dispersion-mixing state. Therefore, depending on the combination of polymers, it is desirable to add a plasticizer to adjust the affinity between the polymers by increasing the mutual affinity. The plasticizer also has a function of adjusting the melt viscosity. Examples of the plasticizer include phthalate esters such as dioctyl phthalate and dibutyl phthalate, phosphate esters such as tricresyl phosphate, and dioctyl adipate. And fatty acid esters of the above, and conventionally known ones such as condensates of adivic acid of ethylene glycol, trimellitic acid esters, glycolic acid esters, chlorinated paraffins and alkylbenzenes can be used.

In the spacer composition, an epoxy resin diluent may be added, if necessary, for the purpose of, for example, facilitating initial mixing or increasing the amount of a filler or the like. Examples of the diluent include reactive diluents such as butyl glycidyl ether , allyl glycidyl ether , phenyl glycidyl ether , cresyl glycidyl ether , and glycidyl ether persatic acid, and dibutyl phthalate , dioctyl phthalate , butyl benzyl phthalate , and tricresyl phosphat Fate , acetyl tributyl citrate , aromatic process oil , pine oil , 2,2,4-trimethyl-1,3-
Non-reactive diluents such as pentadiol isobutyrate may be mentioned. Furthermore, for the purpose of adjusting coating properties such as processability and viscosity, and for the purpose of increasing the amount to reduce costs, a thixotropic agent or a filler may be added as necessary, or a pigment or the like may be added. Is also good. Examples of the thixotropic agent include silicic acids such as silicic anhydride and hydrous silicic acid, bentonites such as organic bentonite, asbestos such as silodex, and organics such as dibenzylidene sorbitol. Further, for example calcium carbonate as a filler, mica, talc, kaolin clay, celite, asbestos, perlite, baryta, shea <br/> silica, silica sand, flaky graphite, dolomite limestone, gypsum, aluminum powder and the like.

[0015] Such spacer composition, said (A),
A predetermined amount of each of the essential components (B) , (C) , (D) and (E) and various additive components used as desired is used, for example, a planetary mixer , a kneader , a roll. , it can be prepared by a Henschel mixer or the like. The spacer composition thus prepared is
The melt viscosity of the foaming agent contained therein at the decomposition gas generation temperature is 2.5 × 10 ^{3 to} 5 × 10 ⁴ dPa. It is preferably in the range of s. When the melt viscosity is out of the above range, it is difficult to obtain a favorable foam having a good appearance and an expansion ratio of 5 times or more and an average cell diameter of 0.5 mm or less. In the structure according to the present invention, the spacer
The sheet (1) is used as a semi-gelled sheet . That is, the adjusted composition is previously formed into a sheet at a temperature equal to or lower than the decomposition temperature of the foaming agent, and then, after the vibration damping sheet (2) is laminated, the next heating step, for example, coating drying 120 ° C to 200 ° C in the process
Foamed and cured by crosslinking of the epoxy resin. The expansion ratio of the spacer sheet (1) is 2 to 30 times, preferably 5 to 10 times. Those having an expansion ratio of 2 times or less can of course fulfill the function as a spacer, but this is not the gist of the present invention from the viewpoint of lightness. There is a possibility that a problem may occur in the durability depending on the use site of the. The thickness of the spacer sheet after foaming is 1 to 50 mm, preferably 3 to 30 mm.
It is. When it is 1 mm or less, it cannot fulfill an effective function as a spacer, and when it is 50 mm or more, in a vehicle application which is an object of the present invention, the space inside the vehicle becomes narrow, which makes it impractical and a heating process such as a drying process. In such a case, a uniform foaming property cannot be obtained.

The material having viscoelasticity used for the vibration damping sheet (2) made of a viscoelastic material in the present invention is particularly limited.
But are not constant, rubber, resin, asphalt based or the like ani
Gerare, it is necessary to consider the required quality, such as vibration damping performance vibration substrate and excellent a heat-welding or unevenness of the lower layer of the spacer sheet (1). When satisfying such demands and considering cost , light weight, etc., asphalt-based damping materials ,
Butyl rubber-based vibration damping materials and the like are preferred. The thickness of such a vibration damping sheet is desirably 10 mm or less, preferably 2 mm or less. When the thickness is 10 mm or more, the weight becomes extremely large, and is not the gist of the present invention. There is no particular lower limit on the thickness. This is because the structure of the present invention is a damping structure with a spacer, and although it depends on the thickness of the spacer sheet (1), even if the damping sheet (2) is thin, it can sufficiently exhibit its function. Vehicle damping structure of the present invention
Methods of manufacturing vehicle panels using the body, for example,
The respective layers of the spacer sheet (1) and the vibration damping sheet (2) are individually placed on the vibration substrate of the vehicle and laminated, and the vibration substrate , the spacer sheet (1) and
The vibration damping sheets (2) may be fused and integrated with each other and foamed, and at the same time, may follow irregularities of the vibrating substrate. foaming and panel together to fuse the panel plate in step
You may make it follow the unevenness | corrugation of a metal plate .

[0017]

The vehicle damping structure according to the present invention, a vehicle floor panel Le, placed on the vibration substrate, such as a dash panel, foaming a spacer sheet (1) by heating
By doing so, the spacer sheet (1) and the damping sheet
(2), and between the spacer sheet (1) and the vibrating base
It is possible to firmly fix the gap between the vibration plate and the plate and to follow the uneven shape of the vibration substrate. Such a structure, space
Sashito (1) lifting a dense cell structure of not high expansion ratio
And, the vibration damping sheet (2) has good rigidity and heat resistance.
Because of the vibration damping structure with spacers that have favorable properties, it not only exhibits excellent vibration damping performance over a wide temperature range, is also suitable as a material for reducing vehicle interior noise, but also has a solid panel structure. This gives a structure with excellent heat insulation.

[0018]

The present invention will be described below with reference to examples and comparative examples. The materials used for the test and the test method are as follows. I. Test material Vibrating substrate: 0.8 mm thick steel sheet spacer sheet (1) A spacer composition was prepared by mixing with a Hobart mixer for 20 minutes at the compounding ratio shown in the following Table 1, and then applied on release paper at a predetermined thickness. did. This was heated at 120 ° C. for 100 seconds to produce a semi-gelled sheet.

[0019]

[Table 1]

Damping material sheet (2) Asphalt-based damping sheet (trade name: Mel sheet, made by Nippon Special Paint) Material code: -F Asphalt foam damping sheet (trade name: Foamed Mel Sheet: made by Nippon Special Paint), material code: -G Thickness Was adjusted in advance by a hot press.

II. Test method A spacer sheet (1) and a damping sheet (2) were combined with a steel plate having a size of 15 × 300 mm and a thickness of 0.8 mm to form a damping structure, and the rigidity ratio of each structure was 20 , 40 ,
It was measured at 60 ° C. Lamination and foaming of each layer were performed by placing each layer on a steel plate and then performing a heat treatment in an oven at 150 ° C. for 30 minutes. The loss coefficient is calculated from the half width at the resonance point of the mechanical impedance, and is calculated by interpolation.
The loss coefficient at 00 Hz was determined. The measurement frequency is 1-1.
000 Hz.

Further, the followability to the uneven shape is as described above.Spec
-Cer sheet (1), damping sheet (2)The material of each width
Cut out to 20 mm and 250 mm in length.
Front view,(B) The height of the wave is 7.8 with the uneven shape shown in the side view.
mm on a steel plate in an oven perpendicular to the wave shape
A heating test was performed, and its followability was observed. Heating conditions are pasted
It is the same as the case of joining. Judgment, close contact without gap
"○",Some gaps remain, but they are acceptable for use
“△” for those without level,Gap remains and is problematic in use
The remaining ones were marked "x". Also, the uniformity of the foam cells
By observing the appearance of,“○”,
“△”,Classified into four levels of “x” and issued
The measurement of the foam ratio was performed. These follow-up and foam properties
Table 2 shows the results of the examples, and Table 3 shows the results of the comparative examples.
You.

[0023]

[Table 2]

[0024]

[Table 3]

From the above results, as shown in Table 2, Examples 1 to 5 are excellent in foaming property , vibration damping property (loss coefficient) , and conformability to irregularities, and particularly excellent in loss coefficient. This sufficiently satisfies the vibration damping performance required by the structure. On the other hand, in Comparative Examples 1 to 7, as shown in Table 3, in the structures of Comparative Examples 1 and 2, the foaming property was extremely poor, and that of Comparative Example 2 was inferior in vibration damping property. Also,
In the structures of Comparative Examples 3 to 7, the loss factor is extremely poor.

[Brief description of the drawings]

FIG. 1 is a front view and a side view of a steel plate used for a followability test.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI // C08L 63:00 (72) Inventor Seiki Yada 1-2-1 Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Research of ZEON Corporation Inside the Development Center (72) Inventor Toshio Nagase 1-2-1, Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Japan Zeon Co., Ltd. Inside the R & D Center (72) Inventor Hiroshi Kagoshima 1-chome, Yakko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 2 In the Research & Development Center of Zeon Corporation (56) References JP-A-61-154840 (JP, A) JP-A-2-248248 (JP, A) JP-A-62-231741 (JP, A) JP-A-62-251131 (JP, A) JP-A-4-73139 (JP, A) JP-A-4-73137 (JP, A) JP-B-60-26417 (JP, B2) (58) Field (Int.Cl. ⁶ , DB name) B32B 1/00-35/00 B60R 13/00-13/10 C08J 9/00-9/42

Claims (1)

(57) [Claims] 1. A vibration-damping sheet (2) made of a viscoelastic material.
Spacer sheet made of foamable thermosetting resin sheet
A laminate having a two-layer structure composed of (1), wherein the spacer sheet (1) is (A) 100 parts by weight of an epoxy resin having one or more epoxy groups in one molecule,
(B) exceeds 0.5 parts by weight co-reactive curing agents for epoxy resins less than 20 parts by weight, (C) decomposition gas generation temperature 100
Not more than 20 parts by weight exceeding 0.5 parts by weight of blowing agent at -220 ° C
Mitsuru, 5 parts by weight more than 0.05 parts by weight (D) a surfactant
Below, and (E) is insoluble in room temperature the epoxy resin, and a rubber elastic body miscible dispersion with the epoxy resin at a temperature of 80 to 150 ° C., or an average does not contain halogen which is insoluble in the epoxy resin at room temperature At least one selected from powdery thermoplastic resins having a particle size of 150 μm or less.
A sheet containing more than 10 parts by weight and less than 200 parts by weight and being semi-gelled by heating at a temperature not higher than the decomposition gas generation temperature of the foaming agent (C).
Vehicle damping structure.