JPH0443025A - Sound-absorbing heat-insulating insulator - Google Patents

Abstract

PURPOSE:To obtain a sound-absorbing heat-insulating insulator having black appearance as a whole by forming a nonwoven fabric in a black system nonwoven fabric having METSUKE of 20g/m<2>-50g/m<2> and forming a thermoplastic synthetic resin film in a black-colored film in thickness of 15mum-50mum. CONSTITUTION:A nonwoven fabric is laminated on a porous material through a thermoplastic synthetic resin film, and thermally joined, thus manufacturing a sound-absorbing heat-insulating insulator. The nonwoven fabric is formed in a black system nonwoven fabric having METSUKE of 20g/m<2>-50g/m<2> and the thermoplastic synthetic resin film is formed in a black-colored film in thickness of 15mum-50mum at that time. Accordingly, even when the METSUKE of the nonwoven fabric is not thickened, the approximately yellow porous material is concealed completely, thus acquiring the black-tone sound-absorbing heat- insulating insulator as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sound-absorbing and heat-insulating insulator.

(Prior Art) The above-mentioned sound-absorbing and heat-insulating insulator is used around the engines of industrial vehicles such as passenger cars, trucks, and forklifts for the purpose of sound absorption and heat insulation.

This sound-absorbing heat insulator is generally made of glass fiber,
The base material is a porous material made of synthetic fibers, etc., and the surface of this porous material is coated with a fabric weight of 2 to prevent fibers from scattering, improve handling workability, and provide water repellency to water.
It is made by laminating skin materials such as non-woven fabrics of about 0 g/m2 to 50 g/m2.

Conventionally, a method for laminating and bonding a nonwoven fabric as a skin material onto a porous material is to laminate a nonwoven fabric coated or impregnated with a thermosetting resin such as a phenol resin on a high-density glass wool plate of a porous material, and then, Previously, a method of bonding by heating was used, but this method had disadvantages such as phenol resin seeping onto the surface of the nonwoven fabric, discoloration, and uneven color, resulting in poor appearance and poor adhesion. There was a problem.

Therefore, currently, a method is employed in which a high-density glass wool plate and a nonwoven fabric are laminated via a thermosetting resin film such as a polyethylene film, and then heated and pressed using a mold.

According to this method, discoloration and color unevenness as described above can be prevented.

Incidentally, with the recent trend toward higher-quality vehicles, it is desired that sound-absorbing and heat-insulating insulators also have a more sophisticated appearance, and for this reason, it is desired that the surface color tone be blackish.

(Problem to be solved by the invention) However, although the color tone of nonwoven fabric is generally black,
Glass wool, which is the base material of the porous material, is yellow because it generally uses phenolic resin as a binder, and this color shows through the surface and prevents the surface of the sound-absorbing and heat-insulating insulator from turning black.

In order to completely hide the yellow glass wool and make the overall appearance of the sound-absorbing and heat-insulating insulator blackish, the non-woven fabric should be made from a thin fabric with a fabric weight of 20 g/m2 to 50 g/m''. 60g/m2~120g
It is conceivable to use a non-woven fabric with a fabric weight of 60 g/m2 to 120 g.
If a non-woven fabric with a thickness of about 1/2 m2 is used, not only will the product become expensive, but the higher the basis weight of the non-woven fabric, the lower its adhesion to porous materials, making wrinkles, tears, etc. more likely to occur. At the same time, there was a problem in that the moldability of the surface, such as the shape of protrusions, deteriorated, and the appearance deteriorated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sound-absorbing heat-insulating insulator that uses a thin non-woven fabric and can have a black overall appearance.

(Means for Solving the Problems) The present invention provides a sound-absorbing and heat-insulating insulator in which a non-woven fabric is laminated to a porous material via a thermoplastic synthetic resin film and thermally bonded, and the non-woven fabric has a basis weight of 20 g/m'' to 50 g/m''.
g/m'' black nonwoven fabric, and is characterized in that the thermoplastic synthetic resin film is colored black and has a thickness of 15 μm to 50 μm.

Porous materials used in the present invention include inorganic porous materials and organic porous materials. As the inorganic porous material, a high-density glass wool board made of ultrafine glass fibers, which has been conventionally used as a material with excellent flame resistance, sound absorption, and heat insulation performance, is preferable, and its thickness is determined from the viewpoint of heat insulation performance and weight reduction. Approximately 3 to 20 mm from (weight per unit 3
00 to 850 g/m'') is preferable.The organic porous material is preferably a felt-like material made by opening natural fibers or synthetic fibers and adhering them to phenolic resin, and the thickness of the organic porous material is as follows: 3 to 2 in terms of insulation performance and sound absorption performance
Approximately 3mm (weight per unit 400-1200g/m
"degree)" is preferable.

Furthermore, the nonwoven fabric laminated on the surface of the porous material is formed of polyethylene, rayon, nylon, polyester, etc. alone or in a blend.

In addition, when using the thermoplastic synthetic resin film to thermally bond a porous material and a nonwoven fabric, it does not impede the surface condition of the nonwoven fabric, provides strong adhesive strength between the two materials, and eliminates the problem of peeling. It is possible to maintain the flame retardancy required for a sound-absorbing and heat-insulating insulator, and the adhesive layer made of the film can prevent water from entering the porous material without applying water-repellent treatment to both the porous material and the non-woven material. Any material can be used as long as it satisfies the above requirements, but it must have a low thermal bonding temperature, a wide thermal bonding temperature range, be difficult to decompose during thermal melting, and be heat-resistant due to external heating. In consideration of good thermal conductivity during bonding, we use polyethylene, polyethylene with ethylene-vinyl acetate copolymer added, and surface-modified materials to improve their adhesion. It is desirable to use it.

Furthermore, in order to color the thermoplastic synthetic resin film black, a pigment such as carbon black or a dye such as oil black may be added to the above-mentioned materials. Furthermore, the thickness of this film can be 15 to 50 μm, and 25 to 50 μm can be used.
~35 μm is preferred. This thickness was set to 15
If it is less than 50 μm, holes will easily form during hot molding and the moisture-proof performance will deteriorate, and if it is more than 50 μm, the film material will easily ooze out from the nonwoven fabric when heated and will adhere to the mold etc., making it difficult to release from the mold. It is.

(Function) In the present invention, a thermoplastic synthetic resin film colored black is used to laminated and bond a nonwoven fabric on a porous material, so that the bonding between the two is good, and the porous material We were able to completely hide the noise and obtain a sound-absorbing and heat-insulating insulator that was black in color as a whole.

(Example) Hereinafter, sound-absorbing and heat-insulating insulators according to examples of the present invention will be described in detail together with comparative examples.

First, we used glass wool of 500 g/rn'' (thickness 8 mm) as the porous material, a black polyethylene film mixed with carbon black as the thermoplastic synthetic resin film, and a polyethylene film with a thickness of 25 μm as the skin material. 3
Polyester nonwoven fabrics weighing 5 g/rn2 were each prepared. Note that the color of the glass wool was yellow.

Next, an upper mold having a complex uneven shape on a molding surface, and a molding surface arranged at a position facing the upper mold and having an uneven shape corresponding to the uneven shape of the molding surface of the upper mold. , and a lower mold that can be heated appropriately were prepared, and a laminate in which a polyethylene film and a nonwoven fabric were sequentially laminated on the porous material was placed between the upper mold and the lower mold. After that, both molds are heated and maintained at a temperature of about 200°C, and both molds are pressed using a press at a pressure of 0.5 kg/
cm" and press time of 2 minutes. As a result, a sound-absorbing and heat-insulating insulator having an overall uneven shape and a thickness of 15 mm at each part was produced.

As a comparative example, a thermoplastic synthetic resin film with a thickness of 2
A sound-absorbing and heat-insulating insulator was produced in the same manner as in the above example, except that a colorless and transparent polyethylene film with a thickness of 5 μm was used, and the nonwoven fabric was a polyester nonwoven fabric with a basis weight of 70 g/m. g/
m" because this thickness was necessary to completely hide the yellow glass wool of the porous material with only the nonwoven fabric.

When the sound-absorbing heat-insulating insulator of the example was compared with the sound-absorbing heat-insulating insulator of the comparative example, it was found that the sound-absorbing heat-insulating insulator of the comparative example had the same overall black color as that of the present example, and the same high-class feel was obtained. However, as the basis weight of the nonwoven fabric was increased, the skin material formed from the nonwoven fabric lost its flexibility, and its compatibility with the porous material decreased, causing wrinkles on the surface of the product and a poor appearance. On the other hand, in this example, the porous material and the nonwoven fabric were firmly bonded, and there were no wrinkles on the surface, which was good.

(Effect of the invention) According to the present invention, a thermoplastic synthetic resin film colored black is interposed between the porous material and the skin material, which is a thin nonwoven fabric with a basis weight of 20 to 50 g/m2, and is thermally bonded to absorb sound. Since we have created a heat insulator, the porous material, which is mostly yellow, can be completely hidden without increasing the fabric weight of the non-woven fabric, resulting in an overall black tone, which improves the appearance. In addition, it is possible to give the sound-absorbing and heat-insulating insulator a diversified arbitrary uneven shape without causing any lifting, wrinkles, etc., and it is possible to further enhance the luxurious appearance.

3 other people

Claims (1)

[Claims] In sound-absorbing and heat-insulating insulators, non-woven fabric is laminated to porous material via thermoplastic synthetic resin film and thermally bonded.
A sound-absorbing and heat-insulating insulator characterized in that the nonwoven fabric is a black nonwoven fabric with a basis weight of 20 g/m^2 to 50 g/m^2, and the thermoplastic synthetic resin film is a black colored film with a thickness of 15 μm to 50 μm. .