JPH0218221B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing vibration damping/sound insulating materials, and its purpose is to produce very simple and It is an object of the present invention to provide a method for producing a vibration damping/sound insulating material that can be worn with good workability.

BACKGROUND ART Conventionally, thermally bonded bituminous vibration damping/sound insulating materials have been mainly used to prevent vibrations and noise from structural members such as vehicles, machines, and building materials. When attaching these vibration damping/sound insulating materials to the above structural members, the structural members are not necessarily flat and horizontal, and these vibration damping/sound insulating materials must also be applied to vertical surfaces or areas close to them. There are quite a few cases where this is not possible. In such cases, the following method has conventionally been used. Namely, (i) a method in which adhesive is applied to the back side of the vibration damping/sound insulating material, it is pasted at a predetermined position on the material to be damped, and then heat-sealed; (ii) a pressure sensitive method is applied to the vibration damping/sound insulating material. A method in which an adhesive is applied and applied directly to the surface of the material to be damped by hand; (iii) a method in which a vertical or nearly vertical surface is repositioned horizontally and then the damping/sound insulating material is applied; (iv) a flexible method. Place a suitable vibration damping/sound insulating material on the damped material,
A known method is to place a metal plate having approximately the same shape as the damping material on top of the material and fix it with spot adhesive or bolts.

However, all of the above four conventional methods had drawbacks and were not satisfactory. In other words, methods (i) and (ii) are not only practically unusable in areas where it is impossible or difficult to install, but also method (i), when heat-sealing,
The damping material may slip and fall, reducing the contact area and reducing the damping effect. Also, in method (iii),
Heat-sealing is required twice, which requires an extra process and is time-consuming. Method (iv) has drawbacks such as high cost and the impossibility of achieving full-surface contact.

The present inventor has continued to conduct research with a view to resolving each of the drawbacks of the conventional methods described above, and in this research, a thermosetting resin layer or ( and) A thermoplastic resin layer is provided, this is laminated on a rubber mold that has been pre-shaped into the shape of the damped material, heated and molded into a shape that follows the shape of the damped material, and then released from the rubber mold. We have discovered that the desired purpose can be achieved by separating and temporarily fixing the molded vibration damping/sound insulating material to a predetermined position of the damped material and then heating it to thermally fuse it. The present invention was finally completed. That is, the present invention provides a sheet-like multi-layer laminate material in which a thermosetting resin layer or (and) a thermoplastic resin layer is previously formed on one side of a sheet-like material whose main component is bituminous material. The sheet-like material is placed on a rubber mold so as to be in contact with the rubber mold, and then heated to form the multilayer laminate into the shape of a rubber mold, and then this laminate is separated from the rubber mold. This relates to a method of manufacturing vibration damping and sound insulating materials.

Since the vibration damping/sound insulating material of the present invention is pre-formed in a shape that follows the shape of the material to be damped, it can be applied to areas that are conventionally impossible or extremely difficult to install without using any adhesive. It can be easily applied as is, and most of the drawbacks of conventional methods can be eliminated. In addition, in the method of the present invention, a thermosetting or/and thermoplastic resin layer is provided on one side of the sheet-like material whose main component is bituminous material, so it has excellent properties not only at low temperatures but also at high temperatures. This has the advantage of providing a vibration damping effect.

The manufacturing method of the present invention will be sequentially explained below using the drawings.

First, as shown in FIG. 1, a thermosetting resin or/and thermoplastic resin sheet 1 and a sheet-like material 2 whose main component is bituminous are bonded together. At this time, the thermosetting resin used is one that has not yet been cured. The entire surface of the thus obtained multilayer damping material 3 is coated with about
Through holes 4 having a diameter of approximately 1 to 10 mm are provided at intervals of 5.0 cm.

Next, as shown in FIG. 2, it is placed on a rubber mold 5 that has been previously formed into the same shape as the vibration damping material.

Thereafter, as shown in FIG. 2B, the damping material 3 is formed by heating and cooled. During this heating, the thermosetting resin is heated to the extent that it is not completely cured, and the thermoplastic resin is heated to reduce its viscosity and is molded into the shape of the rubber mold.

Finally, as shown in FIG.
Separate from.

The sheet-like material mainly composed of bituminous material used in the present invention is formed into a sheet shape by appropriately blending asphalt with inorganic and organic fillers. Examples of the agent include calcium carbonate, mica, talc, asbestos, perlite, and shirasu balloons, and examples of the organic filler include synthetic resins or fibers such as polyethylene, polyamide, and polyester, petroleum resins, synthetic rubber, natural rubber, and wood. powder, rice hulls,
Specific examples include linen, wool, etc. The amounts used are approximately 10 to 30 parts by weight of the inorganic filler and 10 to 20 parts by weight of the organic filler to 40 to 50 parts by weight of the asphalt. In the present invention, bituminous sheet materials containing no rubber components can also be preferably used.

Although it is possible to use ordinary thermosetting resins such as acrylic resin, urethane resin, and phenolic resin as the thermosetting resin layer used in the present invention, epoxy resin is preferably used in the present invention. is preferably used in the form of a sheet. Examples of such epoxy resins include various types such as ordinary bisphenol type, ether ester type, novolak epoxy type, ester type, cycloaliphatic type, and nitrogen-containing glycidyl ether type. Part 1 depending on the physical properties of
The seeds can be used alone or in combination of two or more.

In addition, as a curing agent, it is stable at room temperature and 80 to 200℃.
Those exhibiting activity in the temperature range are preferred, such as dicyandiamide, 4,4'-diaminodiphenylsulfone, imidazole derivatives such as 2-n-heptadecyl imidazole, isophthalic acid dihydrazide, N,N-dialkyl urea derivatives, N. ，
N-dialkylthiourea derivatives and the like are used. The amount of these hardening agents used is not particularly limited, but it is particularly preferable that in the baking process of the coating line of the damped material, the damping material first becomes thermally softened and follows the shape of the damped material, After that, it hardens and is fixed along the shape and is set appropriately according to the baking conditions so that it is completely hardened. Usually, 1 to 20 parts by weight of epoxy resin is
The percentage by weight is fine.

In addition to the above-mentioned epoxy resin and curing agent, various additives may be used as necessary to provide the composition with cohesive strength to the extent that it can be formed into a sheet.
Such additives include, for example, polyvinyl butyral, polyamide, polyamide derivatives,
Thermoplastic resins such as polyester, polysulfone, polyketone, high molecular weight epoxy resins derived from bisphenol A and epichlorohydrin, butadiene-acrylonitrile copolymers or derivatives thereof can be blended. The amount used is 5 to 100 parts by weight of epoxy resin.
It is best to use about parts by weight.

In addition to the above ingredients, in order to prevent sagging, control viscosity, and reduce costs, we use metal powders such as talc, clay, silica, alumina, barium sulfate, iron, lead, zinc, and aluminum, glass beads, perlite, glass balloons, and glass shorts. Fillers such as fibers may be blended, or pigments and dyes such as titanium oxide, carbon black, phthalocyanine blue, Mapico Yellow, and Watchene Red, various anti-aging agents, stabilizers, etc. may be blended.

The blending amount of these components may be about 5 to 500 parts by weight per 100 parts by weight of the epoxy resin.

To prepare a thermosetting resin layer consisting of such components, for example, add a curing agent to an epoxy resin and, if necessary, the above-mentioned optional components, and heat at room temperature or at a temperature that does not cause curing (even if it is slight). It is sufficient to mix the resin composition in a mixing pot, various kneaders, two or three mixing rolls, etc. at a temperature of roll,
It can be made into a sheet using any method such as extrusion molding.

Various thermoplastic resins can be used as the resin for the thermoplastic resin layer used in the present invention, such as polyethylene, polypropylene, vinyl resin, acrylic resin, and styrene resin. Polyethylene or styrene resin, which has a relatively high viscosity and is easy to mold, is preferred. By using this thermoplastic resin, the following characteristics are exhibited, unlike thermosetting resins.

There is less cracking of the resin part.

No blisters occur during curing.

Excellent storage stability.

The rubber mold used in the present invention is a molded product having a shape that follows the shape of the desired part of the damping material, and the rubber component is not particularly limited and can be appropriately selected from a wide range. A typical example is vulcanized rubber. The thickness of this molded product is not particularly limited, but it is usually about 1 to 50 mm from the viewpoint of its durability and workability. This rubber mold may be subjected to a mold release treatment in advance using a silicone resin or various fluororesins such as polytetrafluoroethylene in order to impart mold releasability.

When applying the vibration damping/sound insulating material produced by the method of the present invention to a material to be damped, the damping material is attached to a predetermined position of the material to be damped, and temporarily attached by means such as bolts or spot adhesives. Stop, then heat. This heating has the effect of fusing the bituminous sheet onto the metal plate serving as the damping material and curing 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.

Although there are various types of metal plates as the material to be damped in the present invention, steel is preferable, and steel plates for automobile bodies are particularly preferable. The method of the present invention will be explained in more detail below using the steel plate for automobile bodies as an example.

The damping material according to the present invention is, for example, first assembled into a car body, and then temporarily fixed to a required location on a car body steel plate in a painting line before electrodeposition coating or the next intermediate coating. Although it can be applied to all places where a damping effect is required, when using the damping material according to the present invention, it can be applied to darts panels, propeller shafts,
Excellent effects can be obtained when used in tunnels, etc., which get hot during driving, or when used in complex shapes. Next, in the paint baking oven, the bituminous layer is first softened by heat and conforms to 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 baking furnace conditions or the time the damping material is placed on the car body, but usually 100~
Complete curing and adhesion are achieved in the painting line at 200°C for 20 to 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 on the sheet surface. There is a concern that when using a thermosetting resin layer, the hardened resin will fix the blisters, resulting in poor appearance and
This may lead to poor adhesion and a decline in damping properties, but in the present invention, preferably by providing through holes in the damping material, the above concerns can be prevented and highly reliable damping can be achieved. It is possible to give the method of shaking.

In the present invention, a thermosetting resin layer or a thermoplastic resin layer is provided on a sheet-like material whose main component is bituminous material, but a resin sheet is further provided on the outside of the thermosetting resin layer. It is possible to add an outer layer base material such as. By adding this outer layer base material, it is possible to prevent the resin layer 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. For this outer base material sheet, ordinary resin films such as polyester, vinyl chloride, nylon, polyethylene, polypropylene, etc. can be used, but they do not impair the followability of the vibration damping material and have little shrinkage when heated. Adhesive polyolefins, which have the advantage of adhering well to epoxy resins etc. after curing, are particularly good, especially EVA (ethylene-vinyl acetate copolymer).
is desirable. The thickness of the film at this time is usually preferably about 0.01 to 0.8 mm.

EXAMPLES The present invention will be specifically explained below with reference to Examples. In the following Examples, all percentages indicating the compositions of the epoxy resin layer and the bituminous layer are percentages by weight.

Examples <Epoxy resin layer> Epoxy resin...39% Barium sulfate and calcium carbonate...50% Iron powder...8% Hardening agent and curing accelerator...3% <Bituminous layer> Straight asphalt...50% Talc and calcium carbonate...30% Nylon fiber...5% Petroleum resin...10% Asbestos...5% Next, as shown in Figure 1, a 3 mm thick asphalt sheet with the above composition and an epoxy layer of the same 0.3 mm thickness were pasted. A laminated sheet 4 was obtained. Then, the laminated sheet was placed on a rubber mold having the same shape as the damping material as shown in FIG. 2B, and heated at 140° C. for 15 minutes. By this heating, the laminated sheet was softened and followed the shape of the rubber mold, and the epoxy layer was further semi-hardened to fix the shape of the laminated sheet. It was easily separated from the rubber mold using the method described above. The molded laminate thus obtained was placed over the original vibration-damped body, and
Heated at ℃ for 20 minutes. Since it was preformed, it was easy to install, and there was no displacement, and workability was good.

[Brief explanation of drawings]

FIGS. 1 to 3 are drawings showing each step of manufacturing a vibration damping/sound insulating material in accordance with the method of the present invention. 1... Resin sheet, 2... Bituminous sheet, 3...
...Multilayer vibration damping material, 4...Through hole, 5...Rubber mold.

Claims (1)

[Scope of Claims] 1. A sheet-like multi-layer laminate material in which a thermosetting resin layer or (and) a thermoplastic resin layer is previously formed on one side of a sheet-like material whose main component is bituminous material. Place the component sheet-like material on a rubber mold so that it is in contact with it, then heat it (however, if a thermosetting resin is used, to the extent that it does not completely harden), and mold the multilayer laminate into a rubber mold. A method for manufacturing a vibration damping/sound insulating material, which comprises separating the laminated material from a rubber mold after forming it into a shape. 2. A method for manufacturing a vibration damping/sound insulating material according to claim 1, characterized in that through holes with a diameter of approximately 1 to 10 mm are provided at intervals of 3 to 5.0 mm on the entire surface of the multilayer laminate material. . 3. Claim 1 or 2, wherein the sheet-like material whose main component is bituminous material has a specific gravity of 1.2 to 1.8.
The method for manufacturing the vibration damping/sound insulating material described in section.