JPS61154838A - Vibration-damping and sound-proof material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a vibration-damping and sound-insulating material used for metal plates and the like, and more particularly to a material made of a three-layer laminate that can simultaneously perform vibration damping and sound insulation.

[Prior art]

2. Description of the Related Art Vibration damping materials have conventionally been used to prevent structural members such as vehicles, machines, and building materials from being photographed.

Conventionally used vibration damping materials include a single-layer type 11 vibration material consisting only of a viscoelastic layer, and a two-layer type 11 vibration material consisting of a viscoelastic layer with a higher elasticity polymer composition layer or a metal plate attached. There is a layered VI material. All of these vibration damping materials also function as sound insulating materials due to their material characteristics, and are also used as vibration damping and sound insulating materials. Focusing on the sound insulating properties of these materials, attempts were made to further improve the sound insulating effect, and one of these was the use of foam, usually a sheet of foam, as a vibration damping/sound insulating material consisting of only a single viscoelastic layer. It is known that materials are layered.

However, this method had the following major drawbacks.

In other words, ■ During use, especially when used for automobile panels, when water treatment is applied at the time of application, moisture impregnates the foam seal, and this remains even after heating, significantly reducing the sound absorption effect. Panels etc. corrode due to the moisture. ■The structure is made of laminated foam sheets, so the volume is thick (
This makes it bulky, which is undesirable for storage and transportation. ■When attaching vibration damping/sound insulating material to the vibration damping/sound insulating material, it is often necessary to apply pressure; However, the workability is extremely poor.

[Purpose and outline of the invention]

The purpose of the present invention is to solve the above-mentioned difficulties of conventional vibration damping/sound insulating materials laminated with foam sheets. In the vibration/sound insulating material, a foamable sheet is added on top of the thermosetting resin layer as the constraining layer, i.e., it is not yet foamed, but by applying appropriate foaming means such as heating, it has the property of becoming a foam. By further laminating sheets with
It has been found that the above objects of the invention are achieved. IIp
The present invention relates to a vibration-damping and sound-insulating material characterized in that a viscoelastic material layer, a thermosetting resin layer as a constraining layer, and a foaming material layer are laminated in this order.

【Effect of the invention〕

The vibration damping/sound insulating material of the present invention has a foamable material layer laminated on a thermosetting resin layer as a constraining layer, so it has low bulk (and is convenient for storage and transportation). In addition, even if pressure is applied during application, the pressure does not need to be relieved by the foam layer, making it highly workable. Furthermore, since it is not yet foamed at the time of application, there is no chance of moisture getting into the bubbles. Even if it foams, it is often closed cells (there is no dot point due to water impregnation).

A notable feature of the pond of the present invention is that the three layers of the viscoelastic material layer, the thermosetting resin layer, and the foamable material layer are fused together by heating.
By successfully performing curing and foaming at the same time, these three phenomena cooperate with each other to firmly adhere and adhere to the damping material, producing good vibration damping, sound insulation, and sound absorption effects.

[Structure of the invention]

The vibration damping and sound insulating material of the present invention basically consists of a viscoelastic material layer (1) and a thermosetting resin layer (2) as a constraining layer, as shown in FIG.
) and a foamable material layer (3).

As the viscoelastic material layer (1), in principle, viscoelastic substances, especially viscoelastic polymeric substances, can be used, and typical examples include thermoplastic resins, thermosetting resins, bituminous substances, Examples include various rubbers, which may be used singly or in combination of two or more.

More specifically, thermoplastic resins include vinyl acetate-ethylene copolymer, polyester, polyvinyl butyral, polyamide, polyketone, etc., and rubbers include natural rubber and various synthetic rubbers, including butyl rubber, styrene, etc. Examples include butadiene rubber.

The bituminous material is mainly composed of asphalt and is mixed with inorganic and organic fillers as appropriate.
Examples of inorganic fillers include calcium carbonate, mica, talc, asbestos, perlite, shirasu balloon, etc.
Specific examples of the organic filler include synthetic resins or fibers such as polyethylene, polyamide, and polyester, petroleum resins, synthetic rubber, natural rubber, wood flour, rice husk, hemp, and hair. The amount of these used is asphalt 40 ~
10 to 30 parts of inorganic filler per 50 parts by weight! Quantity part, organic filler lO ~ 20! It's about the amount of parts.

In the present invention, as the thermosetting resin used as the viscoelastic material layer (1), it is possible to use ordinary thermosetting resins such as acrylic resin, urethane resin, and phenol resin. In particular, epoxy resins are preferably used. Examples of such epoxy resins include various types such as ordinary bisphenol type, ether ester type, novolac epoxy type, ester type, cycloaliphatic type, and nitrogen-containing glycidyl ether type, and the physical properties of the composition layer Depending on the situation, one type can be used alone or two or more types can be used in combination.

The curing agent is preferably one that is stable at room temperature and exhibits activity in the temperature range of 80 to 200°C, such as dicyandiamide, 4,4'-diaminodiphenylsulfone, 2
Imidazole derivatives such as -n-heptadecyl imidazole, isophthalic acid dihydrazide, N,N-dialkyl urea derivatives, N,N-dialkylthiourea derivatives, etc. are used. The amount of these hardening agents used is not particularly limited, but it is particularly preferable that in the process of demarcating the coating line of the damped material, first the material No. 11 is thermally softened and follows the shape of the damped material. After that, the epoxy resin is set appropriately according to the baking conditions so that it hardens and is fixed along the shape and is completely hardened.
The ratio may be 1 to 20 parts by weight to 0 parts by weight.

In the present invention, various other components can be appropriately blended into the viscoelastic material layer (1). For example, in order to prevent dripping, control viscosity, and reduce costs, we use metal powders such as talc, clay, silica, alumina, barium sulfate, iron, lead, zinc, and aluminum, glass peas, pearlite, shirasu balloons, and short glass fibers. Fillers may be blended, or pigments and dyes such as titanium oxide, carbon blank, phthalocyanine blue, Mavico Yellow, and Watchchan Red, various anti-aging agents, stabilizers, etc. may be blended.

The blending amount of these is 5 to 5 parts by weight per 100 parts by weight of the viscoelastic substance.
The amount may be about 500 parts by weight.

In the present invention, the thermosetting resin layer (
The thermosetting resin used in 2) has a ratio between the elastic modulus of the thermosetting resin layer (2) and the elastic modulus of the viscoelastic material layer (1) at the ambient temperature where the damping material is used. Ratio is 10'~1
0' dyne/-, preferably 10' dyne
A material of the order of e/- is used.

The thermosetting resin itself used is not particularly limited as long as it has the above-mentioned modulus of elasticity, and its type can be the same as the various thermosetting resins used in the viscoelastic material layer (1). Ru. Furthermore, the curing agent used in the viscoelastic material layer (1) is similarly used as the curing agent.

The materials used as the foamable material layer in the present invention are:
A foamable resin sheet that foams by itself due to the effect of a foaming agent and an elastic foam containing a fixing agent in the voids are flattened and this flattened state is maintained by the fixing agent. These include flattened foams with resiliency properties, which have a restorable part in the foam.

The above-mentioned fixing agent is a resin that softens or melts when heated and can solidify when cooled.

First, the foamable resin sheet used in the present invention will be explained.

A foamable resin sheet refers to a sheet that foams when heated above the decomposition temperature of the foaming agent contained therein.

This foam resin sheet is made of thermoplastic resin, thermosetting resin,
Alternatively, the mixture may contain a foaming agent and, if necessary, a foaming aid, a curing agent, a curing accelerator, a crosslinking agent, a crosslinking aid, a filler,
After blending colorants, stabilizers, etc., and kneading this mixture with a mixing roll, etc., the mixture is heated under temperature conditions that do not decompose the blowing agent, or under conditions that do not harden the resin if the resin component is a thermosetting resin. It can be obtained by forming it into a sheet by extrusion molding or the like.

The resins used for sheet molding include polyethylene, ethylene vinyl acetate copolymer, adhesive polyolefin, etc. as thermoplastic resins, and epoxy resins as thermosetting resins, and these can be blended as necessary. You may.

The blowing agent is regulated by the softening temperature of the resin and the sheet forming temperature, but a wide range of azo compounds, nitroso compounds, hydrazide compounds, etc. can be used.

Next, the flattened resilient foam used in the present invention will be explained.

Elastic foams can be manufactured by various known methods using various polymers. The polymer to be used is not particularly limited as long as it forms an elastic foam that can recover to its original state when the foam itself is compressed and deformed by an external force, such as polyethylene. , polypropylene, ethylene-vinyl acetate copolymer, polyurethane, rubber, etc. Also, as the fixing agent used, substances whose softening point or melting point is lower than the softening point or melting point of the above-mentioned elastic foam and higher than room temperature can be used. The resin used as the fixing agent is a thermosetting resin, thermoplastic resin, etc., and the viscoelastic material layer (1)
The same one used in is used.

The vibration damping and sound insulating material of the present invention has a viscoelastic material layer (
1), consists of a thermosetting resin layer (2) as a constraining layer and a foamable material layer (3), but the thickness of these three layers before foaming is usually the same as that of the viscoelastic material layer (1). 0.2-101
1 m, preferably about 0.5 to 6 mm, thermosetting resin layer (2
) is about 0.02 to 51, preferably about 0.05 to 3-1. When the vibration damping and sound insulating material of the present invention is actually used, that is, after being heated and foamed by being applied to the damped material, the foamable material layer is formed as shown in FIG. is foamed to form a foam layer (3') of usually 1 to 50 m5, preferably 5 to 30+s-.

When the vibration-damping and sound-insulating material of the present invention is used for a metal plate, etc., which is a material to be damped, the vibration-damping and sound-damping material is usually applied with a viscoelastic substance 1i! Place it so that the (1) side is on the metal plate, and then heat it.

Heating has the effect of fusing the viscoelastic substance layer onto the metal plate, which is the damping material, and hardening the thermosetting resin layer. Particularly in the case of objects to be painted, such as steel plates for automobiles, building materials, and ships, heating during baking in the painting line can be utilized.

There are various types of metal plates as the material to be damped in the present invention, but steel is preferable, and a steel plate with an automatic grass structure is particularly preferable. The method of the present invention will be explained in more detail below using the steel plates of these four automobiles as an example.

In the vibration damping method according to the present invention, for example, after first assembling four automobiles, a zero vibration damping device is placed at a predetermined location on a car body steel plate in a painting line before electrocoating or before the next intermediate coating. It can be applied to all necessary places, but according to the present invention! When using ill vibration materials, excellent effects can be obtained when used on dash panels, propeller shafts, tunnels, etc. that get hot during driving or have complex shapes6.
Next, the paint is baked in a furnace, and the jllll material is first softened by heat and follows the shape of the car body. Thereafter, the thermosetting resin layer is cured, and is sufficiently adhered and fixed according to the shape.

Heating conditions vary depending on the furnace conditions or the time when the damping material is placed on the car body, but it is usually 100 to 200℃ and 20℃.
Complete curing and adhesion are achieved in the painting line within 120 minutes. During construction, moisture and oil contained in the sheet, or air interposed between the steel plate and the sheet, due to the immersion process in electrodeposition liquid, etc., generate gas during heat fusion and cause blistering between the sheets. However, in the present invention, preferably By providing the through holes in the vibration damping material, the above concerns can be prevented and a highly reliable vibration damping method can be provided. The through holes to be provided are 1 in diameter at approximately 3.0 to 5.0 cm intervals on the entire surface of the damping material.
~10-rin is desirable.

In the present invention, a thermosetting resin layer is mainly provided on the viscoelastic material layer, but an outer layer base material such as a resin sheet is further added to the outside of the thermosetting resin layer. I can do it. By adding this outer layer base material, it is possible to prevent the thermosetting resin from becoming sticky in an uncured state, and it becomes possible to store the sheet-shaped vibration damping materials in a stacked manner. It also prevents contamination for construction workers, has excellent workability, and is useful for protecting the surface of the cured film even after curing. The outer base sheet may be made of ordinary resin films such as polyester, vinyl chloride, nylon,
Although polyethylene, polypropylene, etc. can be used, adhesive polyolefins are preferable because they do not affect the conformability of the vibration damping material, have little shrinkage when heated, and have good adhesion to epoxy resins after curing.Especially EVA (Ethylene-
Vinyl acetate copolymer) is preferred.

〔Example〕

EXAMPLES The present invention will be specifically described below with reference to Examples. However, in each category, parts refer to parts by weight.

Example 1 [Composition formulation for bituminous sheet] Straight asphalt.
50% talc and calcium carbonate
,,, 30% nylon fiber,,,,,,,,,,,
,,,,,,,,,,,, 5% petroleum resin,,,,,
,,,,,,,,,,,,,,,,,,,,,,, 1
0% asbestos, , , , , , , , , , , , , , .
,,,,,,,, 5% [Composition formulation for epoxy resin sheet] Bisphenol A epoxy resin ,,,,,,,,,,,,,,,,,,,,
,, 3794 barium sulfate and calcium carbonate, ,,,,,,,,,,,,,,,,,,
,, 50% iron powder ,,,,,,,,,,,,
9% dicyandiamide curing agent and curing accelerator
,,,, 4% A zero-order resilient foam flattened product made of a vibration damping material using an asphalt sheet with the above composition of 311 plow thickness as a viscoelastic layer and a 0.3 AUi thick epoxy resin layer as a constraining layer. It was used.

Adhesive agent> Ethylene-vinyl acetate copolymer [vinyl acetate content 14% by weight, melt index 2G, melting point 66°C CVI C
100 parts of AT method)), 5 parts of a blowing agent (azodicarbon type), decomposition temperature: 120° C.) were mixed to obtain a foamable resin composition of 60 mesh baths. This was used as a fixing agent.

<Description of flattened foam> Urethane foam 10m5 thick (apparent density 0.02g/
The above foamable resin composition was contained as a heat-foamable fixing agent in an amount of 150 g/cd throughout the voids of this foam while vibrating the foam, and then the foam was heated to 90 g/cd. C. and immediately flattened by passing through a cooling roll to obtain a flattened resilient foam with a thickness of 1.0 mm.

A bituminous sheet 31 m thick, an epoxy resin sheet 0.3 m thick, and a flattened resilient foam 1.011 m thick are laminated,
This was placed on a cold rolled steel plate and heated at 150° C. for 30 minutes, and then the loss coefficient and normal incidence sound absorption coefficient were measured. The results are shown in Figures 3 and 4, except for (1) in Figure 1.
1 shows the case of Example 1, and (2) in the same figure shows the case where only the bituminous sheet is used.

Example 2 The same bituminous sheet as in Example 1 and the same epoxy resin sheet as in Example 1 were used. The following foamable sheets were used.

[Foamable sheet]

Polyethylene (low-density polyethylene I/7Ml7), 100 parts Blowing agent (azodicarbonamide), 4 parts Crosslinking agent (dicumyl peroxide), 1
The above composition was molded using an extrusion molding machine to a thickness of 0.4 mm.
The 9M blue sheet, epoxy resin sheet, and foamable sheet obtained were laminated in this order to a thickness of 0.8
-Place the bituminous sheet face down on the steel plate. When this was heated in a hot air dryer at 150°C for 30 minutes, a vibration damping and sound insulating material with good adhesion was obtained.The foaming ratio of the foam sheet was 5 times. When examined, it showed excellent vibration damping properties similar to Example 1.

[Brief explanation of drawings]

FIG. 1 is a drawing showing the vibration damping and sound insulating material of the present invention, and FIG. 2 is a drawing showing the state when this is heated. Furthermore, FIGS. 3 and 4 are graphs showing measurements of the loss coefficient and sound absorption coefficient of the vibration damping and sound insulating material of the present invention. (1) , , , , , , , , viscoelastic material layer (2)
, , , , , , , , , , Restriction layer (3) , , , , ,
, , , , , Foaming material layer (3') , , , , , ,
, , , Layer (or more) in which the foamable material layer is foamed

Claims (1)

[Claims] (1) A vibration-damping and sound-insulating material comprising a viscoelastic material layer, a thermosetting resin layer as a constraining layer, and a foaming material layer laminated in this order.