JPH10143164A - Sound absorbing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sound absorbing performance by including active components which increase the dipole moment quantity of a high-polymer material of a fiber sheet into the high-polymer material. SOLUTION: This sound absorbing sheet is formed by adhering the high- polymer material to the fiber sheet. The high-polymer material contains the active components which increase the dipole moment quantity in the high- polymer material. The high-polymer materials having the largest dipole moment quantity in the molecules include polar high polymers. These polar high polymers more specifically include polyvinyl chloride, chlorinated polyethylene, acryl rubber(ACR), acrylonitrile-butadiene rubber (NBR), styrene butadiene rubber(SBR), chloroprene rubber(CR), etc. The high polymer having a glass transition temp. in a service temp. region is used as the high-polymer material. The amt. of the active components to be compounded is preferably a ratio of 10 to 300 pts.wt. per 100 pts.wt. high-polymer material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing sheet applied to shoji paper, sliding paper, wallpaper, ceiling cloth, and the like.

[0002]

2. Description of the Related Art Conventionally, rock wool, glass wool, felt and the like have been known as sound absorbing sheets. In these sound absorbing sheets, sound is absorbed as frictional heat when the sound passes through the fiber surface constituting the sheet while colliding, thereby absorbing sound energy.

[0003] In these conventional sound absorbing sheets, the sound absorbing performance has been enhanced by increasing the resistance of the surface of the fiber constituting the sheet.

[0004]

However, these sound-absorbing sheets are not suitable for securing sufficient sound-absorbing properties.
mm, 10 mm, and in some cases, a thickness of 20 to 30 mm. For this reason, these sound-absorbing sheets are applied as backfill materials arranged inside sliding doors, walls, ceilings, and the like, and cannot be directly applied to shoji paper, sliding door paper, wallpaper, ceiling cloth, and the like.

The present inventors have conducted intensive studies to propose a sound-absorbing sheet which is thin and paper-like and has sufficient sound-absorbing performance through research on a sound-absorbing sheet. The moment amount has a deep relationship with the sound absorbing property, and it has been found that by increasing the dipole moment amount in the sound absorbing sheet, the sound absorbing performance can be significantly improved regardless of the thickness of the sound absorbing sheet. .

[0006] The present invention has been completed based on this finding, and as a thin paper-like sheet, shoji paper, fusuma paper,
It is an object of the present invention to propose a sound-absorbing sheet that can be directly applied to a wallpaper, a ceiling cloth, and the like.

[0007]

According to one aspect of the present invention, there is provided a sound-absorbing sheet in which a polymer material is adhered to a fiber sheet, wherein the polymer material is the same. SUMMARY OF THE INVENTION The gist of the present invention is a sound-absorbing sheet characterized by containing an active ingredient for increasing the amount of dipole moment in the above.

The invention according to claim 2 is characterized in that the polymer material is made of chlorinated polyethylene, acrylic rubber, acrylonitrile.
The gist of the present invention is a sound absorbing sheet comprising a polar polymer selected from butadiene rubber, styrene-butadiene rubber, and chloroprene rubber.

The gist of the invention according to claim 3 is that the sound absorbing sheet is characterized in that the polymer material comprises a polymer having a glass transition point in a use temperature range.

The gist of the invention according to claim 4 is a sound absorbing sheet characterized in that the active ingredient is blended in a ratio of 10 to 300 parts by weight with respect to 100 parts by weight of the polymer material.

The gist of the invention according to claim 5 is that a sound-absorbing sheet is characterized in that the active ingredient is at least one compound selected from compounds containing a mercaptobenzothiazyl group.

The gist of the invention according to claim 6 is that the sound absorbing sheet is characterized in that the compound containing a mercaptobenzothiazine group is N, N-dicyclohexylbenzothiazyl-2-sulfenamide.

According to a seventh aspect of the invention, there is provided a sound absorbing sheet characterized in that the compound containing a mercaptobenzothiazine group is 2-mercaptobenzothiazole.

The gist of the invention described in claim 8 is that the sound absorbing sheet is characterized in that the compound containing a mercaptobenzothiazine group is dibenzothiazyl sulfide.

The gist of the invention according to claim 9 is that a sound-absorbing sheet is characterized in that the active ingredient is at least one compound selected from compounds having a benzotriazole group.

According to a tenth aspect of the present invention, the compound having a benzotriazole group is 2- {2'-hydroxy-
The gist of the present invention is a sound absorbing sheet characterized by 3 '-(3 ", 4", 5 ", 6" tetrahydrophthalimidemethyl) -5'-methylphenyl} -benzotriazole.

According to the eleventh aspect of the present invention, the compound having a benzotriazole group is 2- {2'-hydroxy-
The gist of the present invention is a sound absorbing sheet characterized by being 5'-methylphenyl} -benzotriazole.

According to a twelfth aspect of the present invention, the compound having a benzotriazole group is 2- {2'-hydroxy-
The gist of the present invention is a sound absorbing sheet characterized by being 3'-t-butyl-5'-methylphenyl} -5-chlorobenzotriazole.

According to a thirteenth aspect of the present invention, the compound having a benzotriazole group is 2- {2'-hydroxy-
The gist of the present invention is a sound-absorbing sheet characterized by 3 ', 5'-di-t-butylphenyl} -5-chlorobenzotriazole.

The gist of the invention according to claim 14 is that a sound-absorbing sheet is characterized in that the active ingredient is at least one compound selected from compounds having a diphenylacrylate group.

The invention according to claim 15 is that the compound having a diphenylacrylate group is ethyl-2-cyano-3,
The gist of the present invention is a sound-absorbing sheet characterized by being 3-di-phenyl acrylate.

The gist of the invention according to claim 16 is that the sound absorbing sheet is characterized in that the amount of the polymer material attached is 20 to 300 g / m ² .

The invention according to claim 17 is characterized in that the frequency is 110H
The gist of the present invention is a sound absorbing sheet characterized by having a dielectric loss factor of 7 or more in z.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The sound absorbing sheet of the present invention will be described below in detail. This sound-absorbing sheet is made by attaching a polymer material to a fiber sheet. Although it is a thin paper-like sheet, it has sufficient sound-absorbing performance, and is made of shoji paper, fusuma paper, wallpaper, and ceiling cloth. It can be applied to such as it is.

The fiber sheet may be anything as long as it is a sheet made of thin paper-like fibers applicable to shoji paper, fusuma paper, wallpaper, ceiling cloth and the like. Preferred examples include paper (Japanese paper or semi-paper), cloth, non-woven fabric, and the like, which are used as paper, wallpaper, ceiling cloth, and the like.

The polymer material contains an active ingredient that increases the amount of dipole moment in the polymer material. First, the relationship between the dipole moment amount and the sound absorbing performance will be described. FIG. 1 shows an arrangement state of the dipoles 12 in the polymer material 11 before the air propagation sound (sound energy) is transmitted. It can be said that the arrangement state of the dipole 12 is in a stable state. However, the transmission of the air propagation sound (sound energy) causes a displacement in the dipoles 12 existing inside the polymer material 11, and as shown in FIG. 2, each dipole 12 inside the polymer material 11 It will be placed in an unstable state and each dipole 12 will try to return to a stable state as shown in FIG.

At this time, sound energy is consumed. It is considered that sound absorption performance is generated through the displacement of the dipole inside the polymer material 11 and the consumption of sound energy due to the restoring action of the dipole.

According to such a sound absorbing mechanism, the larger the amount of the dipole moment in the polymer material 11 as shown in FIGS. 1 and 2, the higher the sound absorbing performance of the polymer material 11. Conceivable. For this reason, it is very useful to use a material having a large dipole moment in the molecule as the polymer material in order to ensure higher sound absorbing performance.

A polar polymer having a large amount of dipole moment inside the molecule can be mentioned. As the polar polymer, specifically, polyvinyl chloride, chlorinated polyethylene, acrylic rubber (ACR),
Examples include acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), and chloroprene rubber (CR). These polar polymers are also excellent in mechanical strength and workability.

The sound-absorbing sheet of the present invention is applied in a house room such as shoji paper, fusuma paper, wallpaper, ceiling cloth, etc.
It is important to apply the sound-absorbing sheet so that the sound-absorbing performance is maximized at the temperature at the application place (hereinafter referred to as a use temperature range; specifically, −20 ° C. to 40 ° C.). One of the elements.

In the sound-absorbing sheet of the present invention, a polymer having a glass transition point in the operating temperature range is used as the polymer material in order to maximize the sound absorbing performance in the operating temperature range. As the polymer having a glass transition point in the operating temperature range, specifically, polyvinyl chloride, polyethylene,
Polypropylene, ethylene-vinyl acetate copolymer, polymethyl methacrylate, polyvinylidene fluoride, polyisoprene, polystyrene, styrene-butadiene-acrylonitrile copolymer, styrene-acrylonitrile copolymer, and other polymers such as di-2-ethylhexyl By adding a plasticizer such as phthalate (DOP), dibutyl phthalate (DBP), diisononyl phthalate (DINP),
A glass transition point (T) in the operating temperature range of -20 ° C to 40 ° C.
g) or the polymer itself is -2.
Glass transition point (Tg) in the operating temperature range of 0 ° C to 40 ° C
Acrylic rubber (ACR) having acrylonitrile
Butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (N
R), isoprene rubber (IR), chloroprene rubber (C
R) and polymers such as chlorinated polyethylene.

When selecting a polymer material, handling properties and availability are determined according to the amount of the dipole moment inside the molecule, the operating temperature range, and the application and use form of the sound absorbing sheet. It is also desirable to consider temperature performance (heat resistance and cold resistance), weather resistance, price, and the like.

The active component is a component that dramatically increases the amount of dipole moment in the polymer material.
The active component itself has a large dipole moment amount, or the active component itself has a small dipole moment amount, but by blending the active component, the dipole moment amount in the polymer material can be dramatically increased. Refers to a component that can be

For example, the amount of dipole moment generated in the polymer material 11 under a predetermined temperature condition and the magnitude of sound energy is the same as shown in FIG. Under the conditions, it will increase to 3 times or 10 times. Along with this, it is considered that the energy consumption of the sound due to the restoring action of the dipole when the energy of the sound is transmitted will also increase drastically, and sound absorption performance far exceeding the prediction will be produced.

Examples of the active ingredient which induces such an effect include N, N-dicyclohexylbenzothiazyl-
2-sulfenamide (DCHBSA), 2-mercaptobenzothiazole (MBT), dibenzothiazyl sulfide (MBTS), N-cyclohexylbenzothiazyl-2-sulfenamide (CBS), N-tert-
Butylbenzothiazyl-2-sulfenamide (BB
S), a compound containing a mercaptobenzothiazyl group such as N-oxydiethylenebenzothiazyl-2-sulfenamide (OBS), N, N-diisopropylbenzothiazyl-2-sulfenamide (DPBS),

A benzotriazole in which an azole group is bonded to a benzene ring is used as a mother nucleus, and 2- (2'-hydroxy-3 '-(3 ", 4",
5 ", 6" tetrahydrophthalimidemethyl) -5'-
Methylphenyl} -benzotriazole (2HPMM
B), 2- {2'-hydroxy-5'-methylphenyl} -benzotriazole (2HMPB), 2- {2 '
-Hydroxy-3'-t-butyl-5'-methylphenyl} -5-chlorobenzotriazole (2HBMPC
B), 2- {2'-hydroxy-3 ', 5'-di-t
Compounds having a benzotriazole group, such as -butylphenyl} -5-chlorobenzotriazole (2HDBPCB);

Alternatively, ethyl-2-cyano-3,3-
1 selected from compounds containing a diphenyl acrylate group such as di-phenyl acrylate (ECDDPA)
Species or two or more species.

The amount of the active ingredient is preferably 10 to 300 parts by weight based on 100 parts by weight of the polymer material. For example, when the blending amount of the active ingredient is less than 10 parts by weight, the effect of blending the active ingredient that increases the amount of the dipole moment cannot be obtained, and the blending amount of the active ingredient exceeds 300 parts by weight. May not be sufficiently compatible.

In deciding the active ingredient contained in the polymer material, it is preferable to take into consideration the easiness of compatibility between the active ingredient and the polymer material, that is, the SP value, and to select the one having a similar value.

The amount of the dipole moment varies depending on the type of the above-mentioned polymer material or active ingredient. Even if the same component is used, the amount of the dipole moment changes depending on the temperature at which the sound energy is transmitted. The amount of dipole moment also changes depending on the magnitude of the sound energy. For this reason, it is necessary to select and use a polymer material and an active ingredient so that the largest dipole moment is obtained in consideration of the temperature and the magnitude of sound energy when applied as a sound absorbing sheet. desirable.

The sound-absorbing sheet of the present invention can be obtained by applying the above-mentioned active ingredient-blended polymer material in the form of an emulsion to the fiber sheet. The amount of the polymer material attached to the fiber sheet after the application is not particularly limited, but is preferably 20 to 300 g / m ² , and more preferably 40 to 200 g / m ² . When the adhesion amount of the polymer material is less than 20 g / m ² , sufficient sound absorbing performance cannot be obtained. When the adhesion amount exceeds 300 g / m ² , sufficient sound absorbing performance can be obtained, but the sound absorbing sheet itself is not obtained. It becomes plastic-like and impairs paper-like appearance and properties such as warmth and softness.

In the field of sound absorbing materials, it is known that the sound absorbing performance of one material varies depending on the type of sound, that is, the frequency. In this sound absorbing sheet, by increasing or decreasing its thickness, or by increasing or decreasing its size,
It can correspond to the type of sound. For example, in the case of low frequency (low sound), the sheet thickness is reduced or the sheet area is increased. On the other hand, in the case of high frequency (high sound), it is possible to cope with this by increasing the thickness of the sheet or reducing the sheet area.

As described above, the sound-absorbing sheet in which the polymer material containing the active ingredient is adhered to the fiber sheet dramatically increases the amount of the dipole moment in the polymer material, thereby exhibiting excellent sound absorbing performance. However, the amount of the dipole moment in this sound absorbing sheet is represented by AB shown in FIG.
It is expressed as a difference in dielectric constant (ε ′) between the two. That is, the larger the difference in the dielectric constant (ε ′) between AB shown in FIG. 4 is, the larger the amount of the dipole moment in the polymer material is.

4 is a graph showing the relationship between the dielectric constant (ε ′) and the dielectric loss factor (ε ″). As shown in this graph, the dielectric constant (ε ′) and the dielectric loss factor (ε ″) are shown. ε ″), the following relationship holds: dielectric loss factor (ε ″) = dielectric constant (ε ′) × dielectric tangent (tan δ).

The present inventor has found through research on the sound absorbing sheet that the higher the dielectric loss factor (ε ″) is, the higher the sound energy absorption and sound absorbing performance are.

Based on this finding, the dielectric loss factor (ε ″) of the above-described sound absorbing sheet was examined.
When the dielectric loss factor at 7 Hz was 7 or more, it was found that the sound absorbing sheet had excellent sound absorbing performance.

[0047]

【Example】

Example 1 As a fiber sheet, a paper having a basis weight of 12 g / m ² (Tsugisa paper, P100 C-35) was used, and this was mixed in a polymer material emulsion prepared by mixing 100 parts by weight of DCHBSA with 100 parts by weight of chlorinated polyethylene. By immersing and drying, a sound absorbing sheet having a basis weight of 136 g / m ² (of which the amount of adhered polymer material was 124 g / m ² ) was obtained.

Comparative Example 1 The fiber sheet of Example 1 was directly used as a sound absorbing sheet.

Example 2 Japanese paper having a basis weight of 32 g / m ² was used as a fiber sheet, and this was added to 100 parts by weight of chlorinated polyethylene by DCHBSA.
Was immersed in a polymer material emulsion containing 100 parts by weight, and dried to obtain a sound-absorbing sheet having a basis weight of 73 g / m ² (of which the attached amount of the polymer material was 41 g / m ² ).

Comparative Example 2 The fiber sheet of Example 2 was used as it was as a sound absorbing sheet.

Example 3 A silk fabric having a basis weight of 36 g / m ² was used as a fiber sheet.
A was immersed in a polymer material emulsion containing 100 parts by weight of A and dried to obtain a sound absorbing sheet having a basis weight of 204 g / m ² (of which the attached amount of the polymer material was 168 g / m ² ).

Comparative Example 3 The fiber sheet of Example 3 was used as it was as a sound absorbing sheet.

For each of the sound absorbing sheets of Examples 1 to 3 and Comparative Examples 1 to 3, the mechanical loss tangent (tan δ),
The dielectric loss tangent (tan δ), dielectric loss factor (ε ″), and dielectric constant (ε ′) were measured, and the results are shown in Table 1 and FIG.

[0054]

For these sound absorbing sheets, a normal incidence sound absorption coefficient measuring device (JIS No. A14, manufactured by B & K) was used.
05) was used to measure the sound absorption coefficient. The results are shown in FIG. 6 (Example 1 and Comparative Example 1), FIG. 7 (Example 2 and Comparative Example 2), and FIG. 8 (Example 3 and Comparative Example 3). Each sample had a size of φ29 and a thickness of 200 μm, and a 20 mm air layer was provided behind each sample.

[0056]

According to the sound absorbing sheet of the present invention, a polymer material containing an active ingredient is attached to a fiber sheet, and the amount of dipole moment in the sound absorbing sheet is extremely large. Like shoji paper, fusuma paper, wallpaper, ceiling cloth, etc., it is designed to exhibit excellent sound absorption performance that is far more than expected, even though it is a thin paper-like sheet.

In the case of a sound-absorbing sheet having a dielectric loss factor of 7 or more at a frequency of 110 Hz, excellent sound-absorbing performance is exhibited that cannot be expected from a conventional sound-absorbing sheet.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a dipole in a polymer material.

FIG. 2 is a schematic diagram showing a state of a dipole in a polymer material when sound energy is transmitted.

FIG. 3 is a schematic diagram showing a state of a dipole in a polymer material when an active ingredient is blended.

FIG. 4 is a graph showing a relationship between a dielectric constant (ε ′) and a dielectric loss factor (ε ″) in a polymer material.

FIG. 5 is a graph showing the mechanical loss tangent (tan δ) at each temperature of the sound absorbing sheets of Example 1 and Comparative Example 1.

FIG. 6 is a graph showing the sound absorption coefficient at each frequency of the sound absorbing sheets of Example 1 and Comparative Example 1.

FIG. 7 is a graph showing the sound absorption coefficient at each frequency of the sound absorbing sheets of Example 2 and Comparative Example 2.

FIG. 8 is a graph showing the sound absorption coefficient at each frequency of the sound absorbing sheets of Example 3 and Comparative Example 3.

[Explanation of symbols]

 11 ... resin matrix 12 ... dipole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI E04B 1/82 E04B 1/82 C G10K 11/16 G10K 11/16 D

Claims (17)

[Claims] 1. A sound-absorbing sheet in which a polymer material is adhered to a fiber sheet, wherein the polymer material contains an active component that increases the amount of dipole moment in the polymer material. Sound absorbing sheet. 2. The method according to claim 1, wherein the polymer material is polyvinyl chloride, chlorinated polyethylene, acrylic rubber, acrylonitrile-
The sound-absorbing sheet according to claim 1, comprising a polar polymer selected from butadiene rubber, styrene-butadiene rubber, and chloroprene rubber. 3. The method according to claim 1, wherein the polymer material comprises a polymer having a glass transition point in a use temperature range.
The sound absorbing sheet as described. 4. The sound-absorbing sheet according to claim 1, wherein the active ingredient is blended in an amount of 10 to 300 parts by weight with respect to 100 parts by weight of the polymer material. 5. The sound-absorbing sheet according to claim 1, wherein the active ingredient is at least one compound selected from a compound containing a mercaptobenzothiazyl group. . 6. The compound containing a mercaptobenzothiazine group, wherein the compound containing N, N-dicyclohexylbenzothiazyl-
6. The compound according to claim 5, which is 2-sulfenamide.
The sound absorbing sheet as described. 7. The sound absorbing sheet according to claim 5, wherein the compound containing a mercaptobenzothiazine group is 2-mercaptobenzothiazole. 8. The sound absorbing sheet according to claim 5, wherein the compound containing a mercaptobenzothiazine group is dibenzothiazyl sulfide. 9. The sound-absorbing sheet according to claim 1, wherein the active ingredient is at least one compound selected from compounds having a benzotriazole group. 10. The compound having a benzotriazole group is 2- {2′-hydroxy-3 ′-(3 ″,
4 ", 5", 6 "tetrahydrophthalimidomethyl)-
The sound absorbing sheet according to claim 9, wherein the sheet is 5'-methylphenyl} -benzotriazole. 11. The sound absorbing sheet according to claim 9, wherein the compound having a benzotriazole group is 2- {2′-hydroxy-5′-methylphenyl} -benzotriazole. 12. The compound having a benzotriazole group is 2- {2′-hydroxy-3′-t-butyl-
The sound absorbing sheet according to claim 9, which is 5'-methylphenyl} -5-chlorobenzotriazole. 13. The compound having a benzotriazole group is 2- {2'-hydroxy-3 ', 5'-di-t.
The sound-absorbing sheet according to claim 9, which is -butylphenyl} -5-chlorobenzotriazole. 14. The sound-absorbing sheet according to claim 1, wherein the active component is at least one compound selected from compounds having a diphenyl acrylate group. 15. The sound absorbing sheet according to claim 14, wherein the compound having a diphenyl acrylate group is ethyl-2-cyano-3,3-di-phenyl acrylate. 16. The amount of the polymer material attached is 20 to 30.
Sound absorbing sheet according to any one of claims 1 to 15, characterized in that the 0 g / m ^2. 17. The sound-absorbing sheet according to claim 1, wherein a dielectric loss factor at a frequency of 110 Hz is 7 or more.