JPS62289446A - Material for laminated anti-vibration sound insulator and manufacture therof - Google Patents

Abstract

PURPOSE:To obtain an excellent sound insulation characteristic over a wide range of sound wavelengths from low to high frequencies as well as simplify manufacture by interposing a nonwoven fabric between an anti-vibration material layer of main ingredients of rubber or the like and filler and an expanded plastic layer. CONSTITUTION:When manufacturing a laminated sound insulation antivibration material A, at first at least one of heat-melted rubber, plastic and bituminous substance and filler are mixed, extruded and then rolled into a sheet-shape to form an anti-vibration material sheet 1. The anti-vibration material sheet 1 is then placed on a lower die and over them is placed an appropriate nonwoven fabric 2. Then an upper die is placed over the lower die and plastic liquid for expansion 3 is injected into a space formed by the upper die above the unwoven fabric 2 and the plastic liquid is expanded. In this manner, an excellent sound insulation characteristic over a wide range of sound from low to high frequencies can be utilized. Also, manufacture is simple and suited for mass production.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention The present invention is installed to cover the floor of a vehicle, for example, to suppress vibrations of the floorboard and reduce noise inside the vehicle. 1′,
This invention relates to a laminated vibration damping material.

J.m. On the upper surface of the automobile floorboard or dash board,
A flat plate-like heat-adhesive imaging material called Melsheet (registered trademark), whose main component is asphalt, is attached using a thermal F vibration damping material or an adhesive. Then, if necessary, the surface of the damping material is covered with resin foam, nonwoven fabric (felt), etc. to improve sound insulation performance.

However, when the surface of heat-adhesive damping material is covered only with resin foam, the sound insulation performance in the high frequency range is poor, and heat-adhesive damping material Seedlings whose surface is made only of non-woven fabric have the disadvantage of poor soundproofing performance in the low frequency range.

The first object of the present invention is to have good sound insulation performance from a low frequency sound range to a high frequency sound range, and also to easily adapt to the uneven shape of the object to be mounted. The object of the present invention is to provide a vibration damping and sound insulating material that can comply with the above requirements.

A second object of the present invention is to manufacture such a vibration damping/shielding tX material by a simple method.

According to the first feature of the present invention, the laminated vibration damping and sound insulating material includes a damping material layer whose main components are at least one of rubber, resin, and bituminous material, and a filler, and a resin foam layer. It is provided with a bulky nonwoven fabric interposed therebetween.

Further, according to the second feature of the present invention, the laminated vibration damping and sound insulating material is a vibration damping material that covers the lower mold, the main components of which are at least one of rubber, resin, and plastic material, and a filler. Place the sheet and then layer the bulky nonwoven fabric on top! After Itδ, the upper mold is placed on the lower mold to close the mold, and a raw resin liquid to which a foaming agent has been added is injected into the space above the bulky nonwoven fabric defined by the upper mold. It is manufactured by foaming it.

In addition to natural rubber, synthetic rubbers such as polybutadiene, styrene-butadiene rubber, butyl rubber, neoprene rubber, and chloroprene rubber can be used as the component rubber for the υ1 vibration material.In order to reduce manufacturing costs, recycled rubber can be used. It is also effective to use

In addition, as component resins for vibration damping materials, polyethylene resin,
It is preferable to use at least one of polypropylene resin and ethylene/vinyl acetate copolymer resin.

As the bituminous material for the υ1 vibration material, at least one of straight asphalt, brown asphalt, semi-brown asphalt, etc. is used.

Fillers that are blended as main ingredients in each of the above materials include powdered materials such as talc, clay, and calcium carbonate;
at least one kind of inorganic filler selected from scale-like materials such as mica and hollow spherical materials such as silica balloons is used;
It is also possible to use organic fillers such as resin powder and synthetic fiber waste in combination.

The blending ratio of at least one of rubber, resin, and bituminous material and the filler is preferably 50 to 250 parts of the former (rubber, etc.) ioo yl=Dt to 50 to 250 parts of the filler. The reason is that if the blending ratio of the filler is less than 50 parts by weight, the f,
There is a problem that the II damping material drips and the drop volume decreases, and when the blending ratio of the filler exceeds 250 parts by weight, the stiffness of the damping material increases and it becomes difficult to adapt to the uneven parts of the object to be attached. This is because there is a risk of deterioration in damping performance.

A laminated υj vibration shield @ (A) in which a nonwoven fabric 2 is laminated to cover the surface of a damping material sheet 1 having such a composition, and a resin foam 3 is further laminated on the nonwoven fabric, and a damping material having the same composition. sheet 1
The sound insulation performance was determined for the case (8) in which the surface of the damping material sheet 1 of the same composition was covered only with the nonwoven fabric 3 (see Fig. 1) and the case (C) in which the surface of the damping material sheet 1 of the same composition was covered only with the nonwoven fabric 2. The results of the investigation are shown in Figure 2.

According to Figure 2, the laminated υll vibration sound material B) has poor sound insulation performance in the high frequency range, and the V4 layer υ1 vibration sound insulation material (C) has poor sound insulation performance in the low frequency sound range. It can be seen that the laminated sound insulating material (A) exhibits excellent sound insulating performance from the low frequency sound range to the high frequency sound range17. From the comparison of Seikyu damping and shielding 7:51 (A) and (C), we get
The laminated vibration damping and sound insulating material (^) is particularly effective in the frequency 7'i range of 400 Hz or less.

By the way, in the laminated vibration damping and sound insulating material (A), the surface layer of the soft resin foam 3 is easily damaged. It is effective to reinforce the laminated vibration damping and sound insulating material (A) by reinforcing it.

Furthermore, by using the woven fabric, the vibration damping and sound insulation performance of the resin foam 3 itself can be improved, particularly in the low frequency range.

To obtain the laminated vibration damping and sound insulating material (8), at least one type of heated and melted rubber, resin, bituminous material, etc. and a filler are mixed in a heating mixer, extruded, and then rolled (calendered). ) may be rolled into a sheet shape. The thickness of the sheet is 10 to 5. Omtn is preferable; if it is less than 1.0 m+, the damping effect will be low, and if it exceeds 5.0 m, there will be a problem that the weight will increase significantly and the demand for weight reduction cannot be satisfied.

The obtained damping material sheet 1 is molded under heat and pressure according to the shape of the lower mold, if necessary, and then placed on a fifth mold, which is covered with the nonwoven fabric 2. As the nonwoven fabric 2, use a bulky fabric made by opening and mixing animal fibers, vegetable fibers, and resinous fibers to form a fleece (wool) shape that can be handled (carried, etc.). . Considering the aim of the present invention to obtain excellent sound insulation performance, this nonwoven fabric
The damping material sheet 1 is preferably placed so as to cover 10 to 90%, preferably 30 to 70%, of the upper surface area.

Next, the upper mold is placed on the lower mold to close the mold, and a resin foaming liquid is injected into the space defined by the upper mold on the nonwoven fabric to foam it.

Examples of this resin foam include foamed polyurethane, which is made by adding auxiliary agents such as a blowing agent, catalyst, foam stabilizer, and crosslinking agent to a raw resin liquid containing polyol and polyisocyanate as main ingredients. Obtained by foaming a liquid. The mold preheating temperature during foam molding is 30 to 100℃.
°C is appropriate.

Among the components of sugar beet foaming liquid, as isocyanate, 4.4
-Di-phenyl methane di-isocyanate (MDI)
), l-lylene diisocyanate (TDI), water is used as a blowing agent, and Freon 11 is used as an auxiliary blowing agent. Further, 3@amine or a tin-based catalyst is used as a catalyst, and di-ethanol amine, tri-ethanol amine, etc. are used as a crosslinking agent. Moreover, if asphalt, rubber, etc. are added to the resin foaming liquid component, the sound insulation performance can be improved.

The thus obtained laminated vibration damping and sound insulating material (A) follows the uneven shape of the combined object well and exhibits excellent vibration damping and sound insulating performance.

In addition, it corresponds to the opening of the object to be attached! ? If an opening is formed in the four-layer vibration-damping and sound-insulating material and wiring is carried out through that part, one or more slits may be formed instead of forming an opening in the resin foam 3. , thereby preventing a decline in sound insulation performance.

Additionally, if the bulky nonwoven fabric is wrapped in paper, thin nonwoven fabric, thermoplastic resin film, etc. before obtaining the laminate, it will be easier to handle and the sound insulation performance can be improved. However, if a thermoplastic resin film is used, a large number of small openings should be formed in the film to prevent the sound absorption performance from being poor due to the resin foam.

As a l1i1-like method, between the bulky nonwoven fabric and the damping material,
Alternatively, it is also effective to interpose a thermoplastic resin film having a large number of small openings between the bulky nonwoven fabric and the resin foam.

Goyu Mitate ■ 1 to 10 parts by weight of asbeth and 40 parts by weight (6) parts of calcium carbonate are directly connected to the asphalt component 50 parts consisting of 50 mΩ% of straight asphalt and 50 ffl m% of blown asphalt, and rolled to a thick wall. 2. OM's sheet-like υ1 material is blue.

■ Sprinkle and mix 1 part of phenolic resin powder on 55 parts of fallen cotton and 25 parts of recycled wool to form a fleece.
This is heated to 180°C in a heating furnace to obtain a thickness of class 24.

A bulky nonwoven fabric with an areal density of 880 g/bottom was obtained.

■ Place the sheet-shaped damping material obtained in the above ■ on the lower mold F preheated to 50°C, and place the bulky nonwoven fabric obtained in the above ■ above (50% of the damping material sheet area) (size) were placed one on top of the other.

■Pull out the upper mold onto the F mold to open the mold, add 100 parts of polyether triol, 100 parts of TDI, 4 parts of water.
A #j74 resin foaming liquid consisting of 3 parts by weight of amine-based catalyst 0, and 3 parts by weight of diethanol amine is injected into the space above the bulky nonwoven fabric defined by the upper mold and foamed. A foamed polyurethane was formed.

(2) The thus obtained laminated vibration-damping and sound-insulating material exhibits excellent vibration-damping and sound-insulating performance as shown in FIG.

A glass T11i fiber cloth was attached to cover the outer surface of the resin foam layer of the GI layer vibration damping and sound insulating material obtained in Example 1.

The surface layer of the resin foam layer of the obtained laminated vibration damping and sound insulating material is reinforced, and the durability of the resin foam layer is improved, and an improvement in vibration damping performance can be expected.

As is clear from the above explanation, there is a bulky structure between the damping material layer whose main components are at least one of rubber, resin, bitumen, and a filler, and the resin foam layer. A laminated stationary shielding material consisting of a non-woven fabric with intervening properties; After laminating the bulky nonwoven fabric thereon, the upper mold is placed on the lower mold to open the mold, and a resin foaming liquid is injected into the space above the nonwoven fabric defined by the upper mold. A method of manufacturing a laminated side@sound insulating material has been proposed, which is characterized by foaming the material.

According to the laminated vibration damping and sound insulating material according to the present invention, superior sound insulation performance can be expected in a wide sound range from a low frequency sound range to a high frequency sound range, compared to conventional materials of the same type. Further, the laminated vibration damping and sound insulating material of the present invention is obtained by sequentially placing a sheet-like damping material and a bulky nonwoven fabric on a lower mold, and forming a resin foam layer thereon, and a manufacturing method thereof. is simple and suitable for high-volume production.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing a laminated vibration damping and sound insulating material J3 according to an embodiment of the present invention and two types of laminated vibration damping and sound insulating materials as comparative examples, and Fig. 2 is a laminated vibration damping and sound insulating material J3 according to an embodiment of the present invention. It is a graph showing the sound insulation performance of. A, B, C...Laminated i! I11 Sound insulation material, 1... Damping material sheet, 2... Nonwoven fabric, 3... Resin foam.

Claims (2)

[Claims] (1) At least one of rubber, resin, and bituminous substances,
and a laminated vibration damping and sound insulating material comprising a bulky nonwoven fabric interposed between a damping material layer containing a filler as a main component and a resin foam layer. (2) After placing a damping material sheet whose main components are at least one of rubber, resin, bituminous material, and filler on the lower mold, and further layering a bulky nonwoven fabric thereon. , a laminated system characterized by placing an upper mold on a lower mold, closing the mold, injecting a resin foaming liquid into the space defined by the upper mold on the nonwoven fabric, and foaming it. A method for manufacturing vibration and sound insulation materials.