JP3216833B2 - Vehicle damping structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting on a large-area substrate such as a floor panel of a vehicle , a dash panel or a wheel house, which is easily vibrated and needs to be robust , and is integrated with the substrate by fusion molding. TECHNICAL FIELD The present invention relates to a vehicle vibration damping structure suitable for use in a vehicle.

[0002]

BACKGROUND ART vehicles such floor panel, the dash panel, the vibration substrate surface such as wheel house, heat Chakugata damping material mainly composed of asphalt have conventionally been frequently used. In recent years, on the upper surface of the asphalt-based damping material, a metal sheet or thermosetting as constraining material, a sheet such as a thermoplastic resin are laminated, as a so-called constrained damping mass, the damping performance A method of reducing vibration by improving rigidity is used. However <br/> et al, damping in the range of practical weight even with these techniques the performance, the improvement width rigidity performance is limited, insufficient performance considering the demand for noise reduction of the vehicle interior The reality is that you have come. To compensate for the lack of performance of these structures, recently, the applicants have proposed a damping structure and a spacer with a constrained damping structure with a spacer (Japanese Patent Application No. 4-1589
No. 95). These technical methods prepare a semi-gelled sheet by subjecting the foamable thermosetting resin composition to sheeting and heat treatment at a temperature equal to or lower than the decomposition temperature of the foaming agent contained in the composition. This is laminated with the damping material , or the damping material and the restraining material are stacked on the sheet.
After the layering, the foaming agent in the semi-gelled sheet is decomposed by heat treatment in a drying process such as painting of a vehicle or the like.
At the same time, the sheet and the vibration damping material are fused and integrated to form a structure having a robust foam spacer. Features of the spacer with the damping and the like, with a very low weight range to enhance the damping property, which greatly increase the rigidity, thereby in which further reduced the interior noise.

[0003] However , the semi-gelled sheet that forms the foam spacer by such heat treatment has a high viscosity and a high viscosity.
Because of the wear of the sheet, and for the preservation stacked as it is, although it depends on the degree of Semigeru of, immediately blocking of, or there is a long-term problem of easily blocking of during storage. Therefore, the lower surface of the sheet (the opposite surface to be laminated with the damping material), the non-adhesive material impregnated with a release paper such as a silicone resin was laminated, the aim of handling property improvements and blocking prevention I have.

As described above, the lower surface of the sheet is released from the mold.
According to the method of laminating paper, since the highly adhesive surface is not exposed , the handleability of the sheet is improved, and blocking can be prevented even when the sheets are stacked during storage or transport . However, it is necessary to remove the release paper Oh in when placing it on the vibration substrate surface
You. For this reason, there are inconveniences that the number of operations in the process increases and the removed release paper must be disposed of.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to
The present invention is to provide a vibration damping structure for a vehicle , which can increase the number of operations in the process and eliminate waste, and has good handleability and prevents blocking during storage and transport.

[0006]

According to Means for Solving the Problems The present invention thus
For example, a spacer layer made of a foamable thermosetting resin sheet
(I) and a damping material sheet layer laminated on the spacer layer
(II), or the spacer layer (I) and the spacer layer (I).
The damping material sheet layer (I) laminated on the spacer layer (I)
I) and a three-layer structure in which a restraining material sheet layer (III) is further laminated on the vibration damping material sheet layer (II), and a softening temperature is provided on the lower surface of the spacer layer (I).
The degree is 70-160 ° C and the thickness is 10-50 μm
The present invention provides a vibration damping structure for a vehicle, characterized in that a hot-melt adhesive film (IV) is attached thereto. Book
Vehicle damping structure invention, without Semigeru of sheets is viscous <br/> wear or blocking, and in the mounting step, no work of removing unwanted substances such as release paper, as is the vehicle No waste is generated because it is only necessary to place on the vibrating substrate.

Further , according to the present invention, the vibration damping structure for a vehicle is provided.
Body and Ri by the be integrated vibrating substrate and fusing of the vehicle, a very small range of weight increase of the vehicle can be remarkably improved excellent damping performance and rigidity. Further, if necessary, it can be fused and integrated with a vibrating substrate of a vehicle having irregularities .
Furthermore, the reaction , foaming , and fusion integration of each layer can be completed by heat treatment in a drying step such as painting .

Hereinafter , the present invention will be described. In the present invention
The spacer layer (I) to be used is made of a foamable thermosetting resin sheet , and the lower surface thereof is bonded by hot-melt bonding described later.
It by sticking a film (IV), Ru der those which confer a function as a spacer definitive <br/> the damping mass for a vehicle.
Preferred properties of the spacer in the vehicle damping mass, lightweight rigid rather high, and such as coating drying process or the like
In tightly bonding the vibration substrate is fixed, also deer, such Engineering
In other words, there is a high magnification foaming action. Composition as a spacer having such characteristics is not particularly limited, For example, as shown in Japanese Patent Application No. 4-31442 by the present applicant already proposed, methacrylic the liquid epoxy resin Resin , polybutene , foaming agent ,
The composition was blended with the epoxy resin curing agent and a surfactant; or as represented by Japanese Patent Application No. 4-31441
Further, a composition in which a methacrylic resin , a polyethylene-based resin , a foaming agent , a curing agent for an epoxy resin, and a surfactant are mixed with a liquid epoxy resin is suitable. Such spacer
Layer (I) contains the composition after the preparation
At temperatures below the decomposition temperature of the blowing agent
Heat treatment to form a semi-gelled foam
Obtained as a modified resin sheet.

The damping material sheet layer (II) used in the present invention
The invention provides a vibration damping function in the vehicle vibration damping structure of the present invention . Damping used for damping material sheet layer (II)
The wood, for example, asphalt-based damping material, a rubber-based damping material and the resin-based damping material and the like can be mentioned up. These are described below
Selection depending on the presence or absence of the constraining material sheet layer (III)
To use.

The restraint sheet layer (II) used in the present invention
I) is to restrain the deformation due to vibration of the vibration-damping material sheet layer (II), are those that confer greater damping performance by applying a shear force to the damping material sheet layer (II). The material provided for the restraint sheet layer (III) is not particularly limited as long as it has a high elastic modulus and does not impair the function as a vehicle material. As such a material, steel, metal sheets such as aluminum; a thermosetting resin such as epoxy resin; those thermoplastic resins such as petroleum resin or the like as a base material like et be. In particular , Japanese Patent Application Laid-Open No. 1-141142, which has already been proposed by the present applicant, has been proposed .
As shown in the report and JP-A-1-141143 ,
Thermoplastic resin-based restraining material based on tackifier resin ,
It has excellent characteristics for vehicle use and is suitable.

[0011] The hot-melt adhesive film (IV) used in the present invention is used for storing or damping the vibration damping structure for a vehicle of the present invention.
During the transfer, when stacking them, Semigeru of sheets is prevented and that you sticking or blocking of the space <br/> Sa layer (I), these to vibration substrate of the floor of the vehicle And fix it by a method such as baking or adhesion .
If you are space simply made of foamable thermosetting resin sheet
Compared with a baked sur layer, it provides a function of firmly adhering and fixing. Conventionally , for spacer layer
The materials used tend to cause sticking and blocking ,
Especially in the case of highly sticky materials, put the release paper impregnated with silicone resin, to prevent sticking or blocking of
Was. However, in this case , the vibration damper
When placing the structure, it was necessary to remove release paper from the spacer layer . The hot melt adhesive film (I)
When the V) is stuck to the spacer layer (I), which rather name needs to be removed, it is possible to simplify the working process, it is advantageous from the viewpoint of reducing waste.

[0012] The hot-melt adhesive film (IV)
Is an adhesive whose main component is a thermoplastic resin, which is melted by heating and adhered to an adherend, and which generates an adhesive force by cooling and solidifying , and is formed into a film shape. . While a general adhesive generates an adhesive force due to the dissipation of a solvent or a chemical reaction, the hot-melt adhesive film (IV) used in the present invention is melted by heating and cooled by heating.
The compositions adhesive force is generated by solidifying the retirement is obtained by forming into a film.

[0013] The composition of the hot-melt adhesive film heat
Plastic resin, tackifier resin, plasticizer, filler and the like
It is blended with other additives, heating 及 the vibrating substrate surface such as a vehicle
The fine cooling to form a bond strength that can withstand practical use
If so, there is no particular limitation .

Specifically, for example, as a thermoplastic resin
An ethylene - vinyl acetate copolymer, polyethylene and copolymers thereof, polypropylene, atactic polypropylene, ethylene - acrylate copolymers, polyamides, polyesters, styrene - isoprene block copolymer (SIS), styrene - butadiene copolymerization Merging (SB
S) can be used as base polymer
You. As the tackifier resin, polyethylene wax ,
Wax for lowering melt viscosity such as fatty acid wax ; rosin and rosin derivative ; terpene resin , cumarone-indene
Resins, petroleum resins, and the levator up. Examples of the plasticizer include polybutene , polyisobutylene , chlorinated paraffin , liquid paraffin , and aromatic oil . As a filler
It includes calcium carbonate, titanium oxide, talc, anti-shrinkage or antiblocking fillers such as clay can be mentioned
You. As other additives, an antioxidant, an ultraviolet ray inhibitor and the like are used.

The hot melt adhesive film (IV)
Has a softening temperature by the ring and ball method 70 to 160 ° C., preferably, 90 to 140 ° C.. Its thickness is 10-50
0 μm, preferably 50 to 100 μm . Soft
When temperature is to use the following hot-melt adhesive film 70 ° C., in the case of sticking to a high hot site of the vehicle, because it may bond strength in use is insufficient undesirably. Ma
In general, these materials are baked or fixed in a coating drying process in a vehicle production process. However , since the drying process is usually in the range of 120 to 160 ° C. , the softening point is low.
When using 160 ° C. or more hot melt adhesive film, the adhesive is difficult, since hardly can sticking to the vibration substrate surface is not preferable.

[0016] In addition, the hot melt adhesive film (I
If the thickness of the V) is 10μm or less, the strength is insufficient, stacking a foamable thermosetting resin sheet Semigeru of, transport or
When stored, the hot melt adhesive film breaks.
This is not preferred because Also, one object of the present invention is to provide a vehicle damping mass high performance lightweight, uses its thickness is at least 500μm hot melt adhesive film (IV) Then, the hot-melt used depending on the type of adhesive film, can adversely affect the damping characteristics and stiffness properties, further weight reduction is loss
This is not preferable from the viewpoint of being performed.

[0017] The hot-melt adhesive film (IV) a foamable thermosetting resin sheet made of a spacer layer (I)
How to stuck to the lower surface is not particularly limited, and examples <br/> example, the sol of composition forming the foamable thermosetting resin sheet, after applied onto a hot-melt adhesive film (IV) the at decomposition temperature below the temperature of the foaming agent contained in the composition constituting the foamable thermosetting resin sheet, a hot-melt together to adjust the sheets <br/> Semigeru of the composition
A method of attaching an adhesive film (IV) or
Using the integer was Semigeru of foamable thermosetting resin sheet stickiness, foamable thermosetting resin sheet Semigeru of
The, by placing on the hot melt adhesive film
You may stick it.

Further , these hot melt adhesive films
The plane dimensions of (IV) and the foamable thermosetting resin sheet may be completely the same, and the plane dimensions of the hot melt adhesive film (IV) may be larger than the foamable thermosetting resin sheet. The vibration damping structure for a vehicle according to the present invention includes two layers of a spacer layer (I) to which a hot melt adhesive film (IV) is adhered and a vibration damping material sheet layer (II) ;
Spacer layer (I) to which hot melt adhesive film is adhered , damping material sheet layer (II) and restraining material sheet layer
After preparing each of the three layers of (III),
Prepare by layering.

Further, the vehicle vibration damping structure of the present invention is
When fusing and integrating with a vibration substrate such as a floor panel,
Hot melt adhesive film on the lower surface of the spacer layer (I)
Via (IV), the two-layer or three-layer structure is
Placed on a plate, the foaming agent contained in the spacer layer (I)
By heating and bonding at temperatures above the decomposition temperature
Done.

[0020]

According to the vibration damping structure for a vehicle of the present invention , a vibrating substrate surface and a strong adhesive surface can be bonded to a vibrating substrate such as a floor panel of a vehicle , a dash panel , and a wheel house by fusion. When formed , a damping structure with spacers or a constrained damping structure with spacers can be formed, and excellent damping characteristics and rigidity characteristics can be imparted . Also on the lower surface of the foamable thermosetting resin sheet Semigeru of, for hot-melt adhesive film is stuck is prevented sticking or blocking of the resin sheet, it is possible to store and transport in a state stacked in multiple stages . Furthermore, the structure of the present invention, at the time of mounting the vibration substrate surface of the vehicle, does not need a step of removing the release paper, to be placed on the intact vibration substrate surface
For that you can, and to reduce waste and rationality of work.

[0021]

The present invention will be described below in detail with reference to examples. The test method is as follows. (1) Test material Vibration substrate: 0.8 mm thick steel sheet Foamable thermosetting resin sheet (spacer layer (I) ):
The foamable thermosetting resin composition compounding ratio shown in Table 1, was prepared by mixing for 20 minutes using a Hobart mixer, and coated with a predetermined thickness on the hot-melt adhesive film on shown. This was heated for 100 seconds at 120 ° C., to produce a sheet with Semigeru the micro suspension vinyl chloride resin (polymerization degree 700).

[0022]

[Table 1]

The damping material sheet (II): after the damping material composition compounding ratio shown in Table 2 was kneaded with a roll,
The thickness was adjusted to a predetermined thickness by a hot press . Also, for comparison
Therefore, a commercially available asphalt-based vibration damping material was used.

[0024]

[Table 2]

Restriction material sheet (III) : A steel plate (thickness 0.3 mm) was used. (Material code:
D) Hot melt adhesive film (IV) : A hot melt adhesive film shown in Table 3 was used.

[0026]

[Table 3]

(2) Test Method Vibration Suppression and Rigidity Test A damping material sheet layer (II) is laminated on a spacer layer (I) having a hot melt adhesive film (IV) adhered to the lower surface.
Then, a restraining material sheet layer (III) is placed thereon.
Then, after preparing a three-layer structure, this is placed on a vibration substrate (0.
Placed on the 8mm thick steel plate), 145 ° C., for 30 minutes Conditions
To form a structural specimen by foaming the foaming agent and fusing each layer . The loss coefficient and the rigidity ratio were measured in an atmosphere at 20 , 40 , and 60 ° C. The dimensions of each component are 150 × 300 mm. Loss factor was calculated from the half value width of the resonance frequency of the mechanical impedance, to determine the loss factor of 200Hz by interpolation. Further, calculation of the stiffness was calculated the ratio of the rigidity of the vibration substrate by the following expression of equation (1).

[0028]

Stiffness ratio = (f ₀ / f) ² · {(m ₁ + m ₂ ) / m ₁ }

Here, f ₀ : resonance frequency (H
z) f: Resonance frequency (Hz) when using a single steel plate m ₁ : Surface density when using a single steel plate (kg / m ² ) m ₂ : Surface density when using a multilayer structure (kg / m ² )

Blocking resistance test A damping material sheet layer (II) is placed on the spacer layer (I).
The test pieces, which were integrally structured by placing them on each other and pressing them lightly, were piled in 15 sheets each , and the blocking state after standing for 100 hours in an atmosphere of 45 ° C. and 85% humidity was observed.
The dimensions of the test specimen are 100 × 200 mm. The evaluation of blocking resistance was performed on a five-point scale , with ◎, ○ , △ , x ,
xx. ◎: Blocking is completely absent and can be easily separated. : No blocking and easy separation, but a little sticky feeling. △: While blocking is observed in part, it can be separated. x: Inseparable due to blocking. xx: Complete blocking by adhesion. Damping property, a test result according to an embodiment of the rigid test and blocking in Table 4, Table 5 shows the test results of Comparative Example.

[0031]

[Table 4]

[0032]

[Table 5]

[0033] As shown in Table 4 and Table 5, the vehicle of the present invention
Use the damping mass (Example 1-6), the loss factor, the stiffness ratio is also over good, seen that are blocking resistance is also excellent is the main object of the present invention. On the other hand, when the hot melt adhesive film was not used (Comparative Examples 1 to 3), it was found that the blocking resistance was significantly inferior to all . In the case of using a polyethylene film (Comparative Example 4), it will be peeled off without adhesion by fusion, thus could not be measured. Also , the softening point of the hot melt adhesive film
When it was excessively high (Comparative Example 5), it was not fused to the vibrating substrate, and measurement was not possible. Also, the softening point is too low
Case (Comparative Example 6) and when its thickness is excessively small
(Comparative Example 7) In each case, the blocking resistance was poor.
Also, for those thickness of the hot-melt adhesive film is more than 500μm is not particularly performed test, lacks light weight, see that lacks practicality from cost
You.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Noboru Hino Inventor, Ritsumeikan Center, 1-1-2, Yakko, Kawasaki-ku, Kawasaki, Kanagawa Prefecture JP-A-4-334674 (JP, A) JP-A-4-73139 (JP, A) JP-A-3-27933 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60R 13/08 B32B 5/18 B62D 29/04

Claims (1)

(57) [Claims] 1. A space made of a foamable thermosetting resin sheet.
A layer formed on the spacer layer (I) and the spacer layer (I).
Two layers of the vibration material sheet layer (II) or the spacer
Layer (I) and damping material laminated on the spacer layer (I)
A structure comprising three layers in which a sheet layer (II) and a restraining material sheet layer (III) are further laminated on the vibration damping material sheet layer (II) , wherein the spacer layer (I) Under
The surface has a softening temperature of 70 to 160 ° C. and a thickness of 10
A damping structure for a vehicle , comprising a hot-melt adhesive film (IV) having a thickness of about 50 [mu] m .