JP3248990B2 - Soundproofing material for car interior - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing material for automobile interiors, which comprises a pad material and a vibration damping / sound insulating sheet integrated with each other. More specifically, the present invention relates to a soundproofing material in which the fiber component of the pad material is specified. For example, it is mounted on the dash panel that separates the vehicle compartment from the engine room or on the floor of the vehicle compartment to prevent noise and vibration from the engine room, and exhibits excellent performance in all low-frequency regions. Related to soundproofing materials.

[0002]

2. Description of the Related Art Conventionally, for example, a dash panel or the like that separates an engine room and a vehicle interior of an automobile has a sound absorbing material formed by processing a bulky fiber material or by molding a foam material. The sound insulating sheet is used integrally.

[0003] However, from the demand for further silence in the vehicle interior, development of a molded soundproofing material having an excellent soundproofing effect especially in a low frequency region has been awaited. However, even the method of increasing the weight per unit area and increasing the bulkiness results in a remarkable increase in the weight of the soundproofing material itself, and does not improve the preferable soundproofing effect.

[0004]

Therefore, in the present invention,
It is an object of the present invention to develop a molded soundproof material that satisfies a required soundproof effect in all frequency ranges, rather than increasing the basis weight of the soundproof material.

[0005]

Means for Solving the Problems In order to solve the above problems, the present inventors have made intensive studies and have found that the material of the pad material can exhibit an excellent soundproofing effect in all frequency regions. The gist of the present invention resides in the following.

[0006] In a soundproofing material for a vehicle interior, in which a padding material and a vibration damping / sound insulating sheet are integrated, at least one of bast fiber, leaf vein fiber and fruit fiber is used as a fiber component of the padding material at a weight of 50%. % Or more, and the fiber component contains at least the same amount by weight as a binder component for forming a pad material as a whole.

The pad material used in the present invention must contain at least 50% by weight of at least one of bast fiber, vein fiber and fruit fiber among fibers used, and the other 50% by weight of glass Organic or inorganic natural or synthetic fibers such as wool, cotton, wool, polyester fiber, nylon fiber, rayon, acrylic fiber, polypropylene fiber, polyethylene fiber, carbon fiber, kainol, and various metal fibers can be used. is there. When the use amount of one or more of the bast fiber, the vein fiber and the fruit fiber is less than 50% by weight, there is a possibility that a certain or more excellent soundproof performance may not be exhibited in a high frequency region, which is not preferable.

The bast fiber, vein fiber and fruit fiber essential for the present invention include, for example, hemp, hemp, ramie, jute, manila hemp, sisal hemp, palm and binloge.

As a method for producing a pad material among the soundproofing materials of the present invention, a conventionally known production method can be used. That is, a thermosetting resin such as a phenol resin or a thermoplastic resin such as polyester or polypropylene is mixed with a fiber raw material to form a fleece of 0.6 to 1.5 kg / m ² , and heated to a semi-cured bulk. Manufactures raw material.
This is cut into a suitable size, placed on a mold for molding into an arbitrary shape, and a pad material having a thickness of 1 to 50 mm is formed by pressure molding or heat and pressure molding. can get.

At the time of pressure molding, etc., fillers such as extender pigments and additives are blended with rubbers such as synthetic rubber, natural rubber and recycled rubber, and binders such as bituminous substances and synthetic resins, if necessary. It is also possible to laminate on a rolled or sheeted vibration damping / sound insulating material having excellent vibration damping / sound insulation performance, and to simultaneously form the same, thereby obtaining a sound insulation material having excellent sound absorption performance and vibration damping / sound insulation performance.

[0011]

EXAMPLES In order to facilitate understanding of the present invention, examples will be described below. Needless to say, the present invention is not limited to the following examples.

[0012]

EXAMPLE 1 A phenolic resin was mixed with a mixed fiber raw material consisting of 50% by weight of flax and 50% by weight of jute to form a fleece, which was then heated to a semi-cured state, cut into a suitable size, and cut into an appropriate size. Anti manufactured. The raw material of the pad material was placed on a lower mold heated to 200 ° C., and the upper mold was lowered. The pad was heated and pressed at 100 kg / cm ^{2 for} 1 minute to obtain a surface weight of 1 kg / m ² . A pad material was formed. 40 parts by weight of butyl rubber, bron asphalt 5
Parts by weight, 50 parts by weight of calcium carbonate and 5 parts by weight of talc were kneaded and extruded to a thickness of 3 mm to form a vibration-damping and sound-insulating sheet. The sound insulating sheet was preheated at 100 ° C. for 1 minute, placed on a lower mold cooled to 5 ° C., and vacuum formed. The molded product of the pad material was placed on the vacuum molded product of the vibration damping / sound insulation sheet via an adhesive, and the upper mold was lowered. The molded product was pressed at 100 kg / cm ^{2 for} 30 seconds, and the surface weight was reduced. 5500 g / m ² of the soundproof material 1 for a vehicle interior was obtained.

[0013]

Example 2 A phenolic resin was mixed with a mixed fiber material consisting of 50% by weight of jute, 20% by weight of palm, 10% by weight of ramie and 20% by weight of polypropylene fiber to form a fleece, and then heated to a semi-cured state. The raw material of the pad material was manufactured by cutting into a suitable size. The raw material of the pad material was preheated at 180 ° C. for 1 minute, and then placed on a lower die cooled to 5 ° C., and the upper die was lowered.
g / cm ^{2 for} 1 minute under cooling and pressure molding, surface weight 1 kg
/ M ² of the pad material was prepared. Butyl rubber 40
Parts by weight, 5 parts by weight of bron asphalt, 50 parts by weight of calcium carbonate, and 5 parts by weight of talc were kneaded and extruded to a thickness of 3 mm to form a vibration damping and sound insulating sheet. The vibration-damping and sound-insulating sheet was preheated at 100 ° C. for 1 minute, placed on a lower mold cooled to 5 ° C., and vacuum formed. The molded product of the pad material was placed on the vacuum molded product of the vibration damping / sound insulation sheet via an adhesive, and the upper mold was lowered, and 100 kg / cm.
^{2 was} pressed for 30 seconds to obtain an automotive interior soundproofing material 2 having a surface weight of 5500 g / m ² .

[0014]

Example 3 55% by weight of jute, 5% by weight of wool, cotton 3
A phenolic resin was mixed with a mixed fiber material composed of 5% by weight and 5% by weight of polyester fiber to form a fleece, heated to a semi-cured state, and cut into a suitable size to produce a raw material of the pad material. The raw material of the pad material is 20
It was placed on a lower mold heated to 0 ° C., the upper mold was lowered, and heated and pressed at 100 kg / cm ^{2 for} 1 minute,
A pad material having a surface weight of 1 kg / m ² was formed. Kneading 40 parts by weight of butyl rubber, 5 parts by weight of bron asphalt, 50 parts by weight of calcium carbonate and 5 parts by weight of talc,
The sheet was extruded to a thickness of 3 mm to form a vibration damping and sound insulating sheet.
The vibration-damping and sound-insulating sheet was preheated at 100 ° C. for 1 minute, placed on a lower mold cooled to 5 ° C., and vacuum formed.
The molded product of the pad material is placed on the vacuum molded product of the vibration damping / insulation sheet via an adhesive, and the upper mold is lowered.
Pressure molding at 00 kg / cm ^{2 for} 30 seconds, surface area 55
A soundproofing material 3 for a vehicle interior of 00 g / m ² was obtained.

[0015]

Example 4 20% by weight of jute, 20% by weight of ramie,
A phenolic resin is mixed with a mixed fiber raw material consisting of 10% by weight of Manila hemp, 5% by weight of wool, 25% by weight of cotton and 20% by weight of polyester fiber to form a fleece, which is then heated to a semi-cured state and cut into a suitable size. The raw material of the pad material was manufactured. The raw material of the pad material was placed on a lower mold heated to 200 ° C., and the upper mold was lowered.
g / cm ^{2 for} 1 minute under heat and pressure, surface weight 1kg
/ M ² of the pad material was prepared. Butyl rubber 40
Parts by weight, 5 parts by weight of bron asphalt, 50 parts by weight of calcium carbonate, and 5 parts by weight of talc were kneaded and extruded to a thickness of 3 mm to form a vibration damping and sound insulating sheet. The vibration-damping and sound-insulating sheet was preheated at 100 ° C. for 1 minute, placed on a lower mold cooled to 5 ° C., and vacuum formed. The molded product of the pad material was placed on the vacuum molded product of the vibration damping / sound insulation sheet via an adhesive, and the upper mold was lowered, and 100 kg / cm.
^{2 was} press-molded for 30 seconds to obtain an automotive interior soundproofing material 4 having a surface weight of 5500 g / m ² .

[0016]

Comparative Example 1 A phenolic resin was mixed with a mixed fiber raw material comprising 30% by weight of jute and 70% by weight of polyester fiber to form a fleece, which was then heated to a semi-cured state, cut into an appropriate size, and cut into an appropriate size. Fabrics were manufactured. The raw material of the pad material was placed on a lower mold heated to 200 ° C., and the upper mold was lowered. The material was heated and pressed at 100 kg / cm ^{2 for} 1 minute to obtain a surface weight of 1000 g / m ² . A pad material was formed. 40 parts by weight of butyl rubber, 5 parts by weight of bron asphalt, 50 parts by weight of calcium carbonate and 5 parts by weight of talc were kneaded and extruded to a thickness of 3 mm to form a vibration-damping and sound-insulating sheet. The vibration-damping and sound-insulating sheet was preheated at 100 ° C. for 1 minute, placed on a lower mold cooled to 5 ° C., and vacuum formed. Via an adhesive onto the vacuum forming of the damping, soundproofing sheet brought down the upper die by placing the molded product of the pad material, 100 kg / cm ² at 3
Pressure molding was performed for 0 second to obtain a soundproof material 5 for a vehicle interior having a surface weight of 5500 g / m ² .

[0017]

Comparative Example 2 A phenolic resin was mixed with a mixed fiber raw material consisting of 20% by weight of jute, 20% by weight of hemp, 40% by weight of cotton and 20% by weight of polyester fiber to form a fleece, and then heated to a semi-cured state. The raw material of the pad material was manufactured by cutting to an appropriate size. The raw material of the pad material was preheated at 180 ° C. for 1 minute, and then placed on a lower die cooled to 5 ° C., and the upper die was lowered to 100 kg / c.
m ² at 1 minute, and cooled under pressure molding, surface weight 1 kg / m ²
A molded product of the pad material was prepared. 40 parts by weight of butyl rubber, 5 parts by weight of bron asphalt, 50 parts of calcium carbonate
Parts by weight and 5 parts by weight of talc were kneaded and extruded to a thickness of 3 mm to form a vibration-damping and sound-insulating sheet. The vibration-damping and sound-insulating sheet was preheated at 100 ° C. for 1 minute, placed on a lower mold cooled to 5 ° C., and vacuum formed. Vibration-damping through an adhesive onto the sound insulation vacuum forming of sheet brought down the upper die by placing the molded product of the pad material, 100 kg / cm ² at pressure and pressure-molded for 30 seconds, face weight 5500 g / m ² of the soundproof material 6 for a vehicle interior was obtained.

[0018]

[Test method] The soundproofing effect at each frequency of 100 to 5000 Hz was measured. The test method was as follows: a steel sheet of 0.8 mm thickness was vibrated by hitting about 200 metal balls (8 mmφ average), and the noise level (TL ₀ ) at that time was measured. The noise levels (TL ₁ ) of the vehicle interior soundproofing materials 1 to 6 according to Examples and Comparative Examples were measured. The value of TL ₀ -TL ₁ for each frequency are shown in Table 1 below.

[0019]

[Test results] Table 1 shows the test results. The unit in the table is dB
It is. The higher the number, the better the soundproofing effect.

[Table 1]

[0020]

According to the present invention, the soundproofing material for a vehicle interior is
It was clarified that the required soundproofing effect was satisfied in all frequency ranges.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G10K 11/162 B32B 5/00 B60R 13/08 B62D 29/04

Claims (1)

(57) [Claims] 1. A soundproofing material for an automobile interior, wherein a padding material and a vibration damping / sound insulating sheet are integrated, wherein at least one of bast fiber, vein fiber and fruit fiber is used as a fiber component of the padding material. A soundproofing material for automobile interiors, comprising 50% by weight or more, and a fiber component in the same amount or more by weight as a binder component for forming a pad material as a whole.