JP2671029B2 - Pseudo-restraint type damping material manufacturing method - Google Patents

Description

The present invention relates to a method of manufacturing a pseudo-constraint type vibration damping material,
More specifically, the present invention relates to a method for manufacturing a pseudo-constraint type damping material that is mounted near a vibration source to reduce vibrations and noise.

[Conventional technology]

Generally, in a vibration source such as an engine part of a ship or a vehicle, a vibration damping material made of a synthetic resin 2 such as epoxy resin is attached (bonded) to a metal 1 (iron, aluminum, etc.) serving as a vibrating member so It reduces noise.

The damping material includes a non-constraining damping material X as shown in FIG. 2 (a) and a restraining damping material Y as shown in FIG. 3 (a).
There are two types, and both reduce vibration energy by internal loss of the damping material (converted into heat energy) to reduce noise.

The unconstrained damping material X is deformed as shown in FIG. 2 (b) when subjected to vibration from the state shown in FIG. 2 (a),
The internal loss (tan δ) of the base polymer itself and the filler compounded in the polymer undergo shear deformation between the fillers and between the filler polymers during bending (vibration) of the vibrating member, turning the vibration energy into friction energy. Converts and absorbs vibration.

Further, as shown in FIGS. 3 (a) and 3 (b), the constraining type vibration damping material Y sandwiches the synthetic resin material 2 on the substrate 1 between constraining plates 3 made of a metal material such as aluminum or iron. The internal loss mechanism is the same as that of the unconstrained damping material X,
When the vibrating member bends (vibrates), the restraint plate 3 has a large difference in elastic modulus between the restraint plate 3 and the synthetic resin 2.
Shear deformation occurs between the synthetic resin material 2 and the synthetic resin material 2 as shown by the arrow in FIG. 3 (b), and this deformation converts vibration energy into heat energy (friction) to absorb vibration.

This shear deformation converts the vibration energy into heat energy more efficiently than the internal loss mechanism of the unrestrained damping material X.

Therefore, the thickness of attachment to the vibration member is
<Non-restraint type damping material X ”, when the weight attached to the vibrating member is“ constrained type damping material Y <non-constrained type damping material X ”, thickness,
Even if the weight is small, the restraint type damping material Y is the non-restraint type damping material X.
There is an advantage that it has high endurance compared to.

[Problems to be solved by the invention]

However, the restraint type damping material Y has the following problems.

(A). Processing is inconvenient because it is a metal plate.

(B). It cannot be mounted in a complicated shape, and it is particularly difficult to mount it on the R part.

(C). The manufacturing process is more troublesome than the unconstrained type.

(D). The surface may require anti-corrosion coating.

[Object of the invention]

The present invention has been devised in view of such conventional problems, and the synthetic resin layer of the constraining type vibration damping material is constituted by two layers of a flexible resin layer and a resin layer having high rigidity, and has the conventional drawbacks. The method of manufacturing a pseudo-constraint type vibration damping material, which is easy to manufacture and process, can be mounted at any position, reduces vibration energy due to internal loss of the vibration damping material, and achieves low noise. It is intended to provide.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention integrally molds a synthetic resin lower layer made of a synthetic resin layer constituting a damping material and a synthetic resin upper layer containing a glass fiber chip, and By giving a difference in elastic modulus, in particular, let the synthetic resin upper layer mixed with the glass chip layer function as a pseudo restraint layer,
The gist is to reduce the noise by causing shear deformation and efficiently converting the vibration energy into heat energy.

That is, as the synthetic resin material, an epoxy resin is used, and a synthetic resin in which the glass fiber layer is blended so that the glass fiber chip layer is formed on the surface side of the synthetic resin upper layer The upper layer and the lower layer of synthetic resin made of a single material were integrally molded.

[Function of the invention]

The present invention is configured as described above, a predetermined amount of glass strand chips or metal fiber chips are mixed with a liquid synthetic resin material, and the specific gravity of the synthetic resin material and the difference in specific gravity between the chips cause a surface layer side. A chip layer is formed, and a synthetic resin layer having flexibility and a synthetic resin layer containing a highly rigid glass chip layer are integrally molded and fixed on a metallic substrate. It is preferable that the glass transition point (Tg) between the upper layer of the epoxy resin mixed with the chip layer and the lower layer of the epoxy resin composed of a single material has a difference of 30 ° C to 40 ° C. Increase Tg).

[Embodiment of the invention]

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a pseudo-constraint type vibration damping material embodying the present invention. Reference numeral 11 is a virtual vibration member made of aluminum or iron.
Indicates a synthetic resin layer made of an epoxy resin having a predetermined thickness,
An unrestrained damping material is constructed by both members, and in this invention,
The synthetic resin layer 12 is integrally molded with a synthetic resin upper layer 14a made of an epoxy resin mixed with a glass strand chip or a metal fiber chip 13 and a synthetic resin virtual 14b made of a single epoxy resin material.

The glass transition point (Tg) of the epoxy resin between the synthetic resin upper layer 14a and the synthetic resin lower layer 14b preferably has a difference of 30 ° C to 40 ° C, and particularly, the glass transition point (Tg) of the synthetic resin upper layer 14a (Tg).
The higher g) is, the better.

By configuring as described above, there is a difference in elastic modulus between the synthetic resin upper layer 14a mixed with the glass fiber chip or the metal fiber chip 13 and the synthetic resin lower layer 14b made of a single epoxy resin material, and particularly glass. The upper layer of the synthetic resin mixed with the chip layer functions as a pseudo constraining layer to cause shear deformation and efficiently convert vibration energy into heat energy.

As a method for producing such a pseudo restraint type vibration damping material, a liquid epoxy resin material is mixed with a glass strand chip or a metal fiber chip for 10 to 50 Phr and molded by a 16 mm thick mold. Use as choreography.

That is, glass strand chips or metal fiber chips
Utilizing the difference in specific gravity between 13 and the epoxy resin material, it is blended so that a chip layer is formed on the surface layer side, and a synthetic resin layer (lower layer) 14b having flexibility and a glass chip layer with high rigidity are blended. The synthetic resin layer (upper layer) 14a is integrally molded and attached (bonded) to a metallic vibrating member to form a non-restraint type vibration damping material exhibiting performance close to that of the constrained type vibration damping material. .

4 and 5 show the structures of the conventional unconstrained damping material and the pseudo-constrained damping material of the present invention, and FIG. 6 compares the loss coefficient (η) of both damping materials. The graph explanatory drawing is shown.

In FIG. 6, as a result of comparing the loss factors of frequencies 200 Hz and 1000 Hz, the pseudo-constraint type damping material of the present invention has a larger loss coefficient (η) with respect to temperature than the conventional unconstrained type damping material. It turns out that the damping effect is great.

The thickness of the fiber layer in the pseudo restraint type damping material is set to 1/2 or less of the total thickness of the damping material.

〔The invention's effect〕

This invention is in the form of liquid epoxy resin as described above,
A predetermined amount of glass strand chips or metal fiber chips are mixed, a specific gravity of the epoxy resin material and a chip layer is formed on the surface layer side due to a difference in specific gravity between the chip material, a synthetic resin layer having flexibility, and rigidity. Since it is integrally molded with a synthetic resin layer containing a high-performance glass chip layer and is fixed on a metallic substrate, conventional workability and mountability can be effectively resolved, and fabrication and processing are easy. It can be mounted at any position, and in particular, by making the upper and lower resin layers have different elastic moduli and making the synthetic resin upper layer containing the glass chips function as a pseudo restraint layer, shear deformation is caused and vibration energy is heated. There is an effect that noise and vibration can be effectively reduced by efficiently converting into energy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view when a pseudo-constraint type damping material embodying the present invention is attached to a vibrating member, and FIGS. 2 (a) and 2 (b) are
A cross-sectional view when a conventional non-restraining type vibration damping material is attached to a vibrating member and a cross-sectional view when subjected to vibration, FIGS. 3 (a) and 3 (b),
A cross-sectional view of a conventional restraint type vibration damping material and a cross-sectional view when subjected to vibration, and FIGS. 4 and 5 are cross-sectional views of a conventional non-constraint type vibration damping material and a pseudo restraint type vibration damping material of the present invention. , FIG. 6 is a graph explanatory view comparing the loss factors of the vibration damping materials of FIGS. 4 and 5. 11 …… Substrate (vibrating member), 12 …… Synthetic resin layer, 13 …… Glass strand chip or metal fiber chip, 14a ……
Synthetic resin upper layer, 14b ... Synthetic resin lower layer.

Claims (3)

(57) [Claims] 1. A liquid epoxy resin material is mixed with a predetermined amount of glass strand chips or metal fiber chips, and a chip layer is formed on the surface layer side by the specific gravity difference between the epoxy resin material and the chip material. Then, a synthetic resin layer having flexibility and a synthetic resin layer mixed with a glass chip layer having high rigidity are integrally molded and fixed on a metallic substrate, which is a pseudo-constraint type vibration damping. Method of manufacturing wood. 2. The glass transition point (Tg) of the epoxy resin in the upper layer of the synthetic resin is set to be 30 ° to 40 ° higher than the glass transition point (Tg) of the epoxy resin in the lower layer of the synthetic resin. A method for manufacturing the pseudo-constraint type damping material described in. 3. The method for producing a pseudo-constraint type vibration damping material according to claim 1, wherein the liquid epoxy resin material is mixed with glass strand chips or metal fiber chips for 10 to 50 Phr and molded by molding. .