JPH0270860A - Sound insulation material for building floors - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a sound insulating material for a building floor that improves the sound insulation performance of the building floor by disposing it between a building floor base and a flooring material. .

[Conventional technology] Conventionally, carpets have been mainly used as flooring materials for medium-to-high-rise housing, but there are environmental hygiene problems such as the tendency to generate house dust and dust mites, and recently wooden flooring materials have been rapidly used. It is becoming popular. However, wood flooring has the disadvantage that its sound insulation performance is significantly inferior to that of carpets, and for this reason, various proposals have been made to improve the sound insulation performance when using wood flooring. .

For example, JP-A-55-39529 discloses that a synthetic resin foam with an initial compression modulus of 2.5 to 25 kg/cm' and a dynamic spring constant of 5 to 25 x 10'N/m' is used as a sound insulating material. It is disclosed that a sound insulating floor is constructed by disposing this synthetic resin foam between the flooring material and the base material, but in this example, in order to obtain the desired sound insulating performance, the synthetic resin foam is It is necessary to form the foam to a thickness of 20 to 90 ml11, and if such a thick foam is used as a base material for the floor, the thickness of the entire floor will be very thick, so when used in apartment complexes etc. Due to its special structure, it was difficult to construct even when renovating an existing house, making it impractical.

Further, Japanese Utility Model Application Publication No. 121357/1983 discloses a sound-insulating heat-insulating panel having a four-layer structure of a plate/a foamed plastic board/a board/a foamed plastic board. However, in the case of this sound insulation insulation panel, each foamed plastic board or flat plate is used, so in order to improve the sound insulation performance, each foamed plastic board needs to be made as thick as possible. However, even if the foamed plastic board is made thicker, the sound insulation performance can only reach a sound insulation grade of L-60, which is practically unsatisfactory. It was difficult to achieve a sound insulation grade of L-55.

[Problems to be Solved by the Invention] An object of the present invention is to provide a sound insulation material that is thin and has excellent sound insulation properties and workability.

[Means for Solving the Problems] In order to solve the above problems, the sound insulation material of the present invention is a synthetic resin foam containing a polyolefin resin and an inorganic powder, and having a pressure of 1119 g and a modulus of 20 to 50 kg/cm2. It is characterized by having wavy surfaces facing in different directions on the upper and lower surfaces.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the sound insulation material according to the present invention.
This sound insulating material 1 is composed of a synthetic resin foam sheet containing polyolefin resin and inorganic powder, and the upper and lower surfaces of the sound insulating material 1 have corrugated surfaces 2a and 2b each having a large number of protrusions 3. The protrusions 3, 3 in 2a, 2b are formed in different directions on the upper surface and the lower surface.

As the polyolefin resin used in the present invention, polyolefins such as low density polyethylene, high density polyethylene, and ethylene vinyl acetate copolymer are preferred.

In addition, the powders include carbonates such as calcium carbonate and magnesium carbonate, silicates such as kaolin, calcined seaweed, talc, and pennite, metal hydroxides such as aluminum hydroxide, magnesium hydroxide, and calcium hydroxide; Examples include sulfates such as barium sulfate and calcium sulfate, saponified metals such as aluminum oxide, magnesium oxide, tin oxide, and iron oxide. Among these, calcium carbonate is particularly suitable for obtaining a foam with uniform, fine cells.

These inorganic powders have an average particle size of 1.5 to 5.0 pu
The mixing ratio of the inorganic powder to the entire sound insulating material is preferably 20 to 50% by weight, considering the adhesion to the building floor base and flooring material, the elasticity as a sound insulating material, etc.
It is preferable to do so.

The synthetic resin foam sheet is produced by adding a blowing agent, a crosslinking agent, etc. to the polyolefin resin and inorganic powder, kneading the mixture using an internal mixer, a Pan Bali mixer, etc., and then rolling,
Form into a sheet using an extruder, etc.

Next, it is formed by foaming using a press foaming method.

As the blowing agent used at this time, azodicarbonamide, diphenylsulfone-3,3° disulfohydrazide, benzylsulfonic acid diphenylhydrazide, etc. are suitable.

Further, as the 3-crosslinking agent, 1.3bis(tert-butylperoxyisopropyl)benzene, 2.5dimethyl-2
, 5-di(tert-butylperoxy)hexane, dicumyl peroxide, 2,5-dimethyl-2,5-
C(tert-butylperoxy)hexene-3 and the like are preferred.

Furthermore, when forming the foam sheet, various additives such as antioxidants, colorants, foaming aids, crosslinking aids, lubricants, and flame retardants may be added as necessary.

Here, the apparent density of the foam sheet is 0.07 to 0.15 g from the viewpoint of improving elasticity and sound insulation properties as a sound insulation material.
/cm', and the hardness is preferably 40 to 70 degrees from the viewpoint of durability and elasticity as a sound insulating material.

Furthermore, the compression modulus of the foam sheet is 20 to 50 kg/
cm2 is preferred.

If the compressive elastic modulus is less than 20 kg/cm, the elasticity is significantly reduced and impact sound cannot be absorbed.
If it exceeds "g/cm", the elasticity will be too large and it will not be able to absorb the impact sound of a lightweight machine like a cod pink machine.

It is preferable that the thickness t of the sound insulating material 1 is in the range of 2 to 2 hm, and the intersection angle of the protrusions 3, 3 on the upper surface and the lower surface may be of any size. It is preferable to set the sound insulating material 1 at an angle as close to that as possible, and there are no particular restrictions on the cross-sectional shape of the corrugated surfaces 2a, 2b or the spacing between the protrusions 3, 3, etc. Considering the adhesion properties when adhering to the substrate, sound insulation properties after adhesion, etc., it is preferable to form the adhesive so that the adhesion area on the upper and lower surfaces is in the range of 30 to 50% of the total area.

The sound insulating material 1 having the above configuration is used, for example, as shown in FIG. 2 or 3.

Figure 2 shows an example in which a sound insulating material 1 is placed between a building floor base 5 made of mortar and a flooring material 6, and these are bonded together using a commonly used vinyl acetate or epoxy adhesive. be.

In this case, both the upper and lower surfaces of the sound insulating material 1 are corrugated surfaces 2a and 2b.
Since it is bonded to the original substrate 5 and the flooring material 6 with a small contact area, and the directions of the protrusions 3, 3 are different on the upper and lower surfaces, the impact sound acting on the sound insulating material 1 through the flooring material 6 is reduced. , is effectively absorbed and relaxed by the elasticity of the protrusions 3, 3, and at the same time is dispersed in different directions on the upper and lower surfaces through the air layer 4.4 between the protrusions, thereby significantly improving the sound insulation effect. do.

On the other hand, FIG. 3 shows an example in which the sound insulation material is arranged in two layers, in which the lower sound insulation material 1a is arranged between the original substrate 5 and the intermediate base plate 7, and the lower sound insulation material 1a is arranged between the intermediate base plate 7 and the floor material 6. An upper sound insulating material 1b is disposed between them.

In this way, when sound insulating materials are placed on two calendars, rq
1i! ! Due to the synergistic effect of the sound materials 1a and 1b, the sound insulation effect can be further enhanced compared to that shown in FIG. 2 above.

In addition, in FIG. 3 above, instead of using the structure shown in FIG. 1 as the upper sound insulating material 1b, holes are made in a flat synthetic resin foam sheet so that the adhesive area is 30 to 50%. It is also possible to use a perforated plate provided with a perforated plate, and in this case, although the sound insulation performance is slightly inferior to the case where the structure shown in Fig. 1 is used as the upper sound insulation material 1b, it maintains a high level of sound insulation performance. At the same time, durability can be further improved. That is, when multiple layers of sound insulating material are provided, each layer may have a sound insulating material with a top and bottom surface or a corrugated surface, or a sound insulating material with a corrugated surface and a flat porous member may be used in combination. Therefore, it is possible to form a more effective sound insulating floor depending on the purpose, depending on whether priority is given to sound insulation or durability.

Next, a performance experiment regarding the sound insulation material of the present invention will be explained.

The sample testing method and performance criteria for each experiment are as follows.

(1) Apparent density was determined by the following formula according to JISK 6767 polyethylene foam test method.

D: Apparent density (g/cm') W: Mass of sample (g) V: Volume of sample (cm'') (2) Hardness 5 Using a Sbring hardness tester according to RIS 0101 physical test method for expanded rubber It was measured using

(3) Compression modulus was determined by the following formula in accordance with JISK 722Q compression test method for rigid foam plastics.

Ec: Compressive elastic modulus (kg/cm2) △σ: Stress difference between two points on a straight line (kg/cm”) △ε:
Difference in strain between the same two points (4) Adhesiveness Using an Instron type tensile tester, the tensile speed was 3 m.
A test was conducted at a rate of m/min, and the adhesive strength was measured using the following formula, and was judged based on the following evaluation criteria.

<Adhesive strength> K: Adhesive strength (kg/cm2) F: Load at peeling (kg) A: Cross-sectional area of sample (cm2) <Adhesiveness evaluation criteria> Is it the adhesive strength between the flat foam sheet and the plywood? Approximately 5kg/c
m2, the following evaluation was made using this value as a standard.

Less than 3 kg/cm” ml x3~4kg/
Less than cm2 = b △ Less than 4 to 5 kg/Cm2 - 0 More than 5 kg/cm2 Instant ◎ (5) Method of measuring sound insulation performance Measured according to JISA 1418 Method of measuring floor impact sound level (tapping machine) at building site. Frequency 63, 125, 250, 500, 1000.2000.
Measurement was performed at 4000 (Hz), and judgment was made based on the following evaluation criteria.

Sound insulation class L-65 Shun × Sound insulation class L-60-* △ Sound insulation class L-55-=D O Sound insulation class L-50 Moan ◎ (5) # Lay the flooring material on the human body base through the sample, 1 on top of that
．． A static load of 5 kg/cm'' was applied, and the amount of settling of the flooring after 24 hours was measured, and the evaluation was made according to the following evaluation criteria.

Settlement amount 2.0 mm+ or more Groan × Settlement amount 1
,5~less than 2.0mm ΔSinking amount 1.0~1.5
Less than arm # O Sinking amount Less than 1.0 mm -◎ (7) Comprehensive evaluation When each evaluation item is ◎ or ○ ◎ Δ or more than one of each evaluation item Instant Δ × or more than one of each evaluation item 4 × (Creation of foam for samples) Prior to the experiment, five types of foam (NO, 1 to 5) were created by the first method in order to create samples as sound insulation materials. These foams are shown in Table 1.

Foam No. 1) F-251- manufactured by Sumitomo Chemical Co., Ltd. as low-density polyethylene
1 (density + 0.92 g/cm', melt index 1.2 g/cmff) at 80 weight percent, calcium carbonate manufactured by Sankyo Seifun■ as an inorganic powder: Niscalon "800 (average particle size 1.6 p, ra) ) and 20% by weight of azodicarbonamide manufactured by Daiga Kagaku ■ as a blowing agent; AZ-L
3.0 parts by weight and 1.0 parts by Kayaku Marley ■ as a crosslinking agent.
0.5 parts by weight of 3-bis(tertiary-butylperoxy-isopropyl)benzene; Percadox 14/40 was used, and after kneading them with an internal mixer, they were formed into a sheet with two rolls and foamed using a pressure foaming method. The body was created.

The resulting foam has a density of 0.07 g/cm3. It had physical properties of hardness of 40 degrees and compressive elastic modulus of 20 kg/cm2, and the air bubbles, which greatly affected adhesiveness, were uniform and fine.

<Foam N002-5> As an inorganic powder, calcium carbonate manufactured by Sankyo Seifun ■; Niscalon" 800 (average particle size 1.65 uLm),
and calcium carbonate; Niscalon special grade "1" (average particle size 2.961 Lm), calcium carbonate manufactured by Shiraishi Calcium ■; Whiten 0 (average particle size 3.6L II), Whiten AA (average particle size 5.0 gm) ), four types of foams were produced with the formulations shown in Table 1.

The cells of these foams were also uniform and fine.

(Example 1) Cut the NOol foam to 30 cm in length x 30 cm in width.
c@X thickness 2.0! +11 and height 30cm x width 30cm
Two foam sheets with a thickness of 4.0+am were formed, and the foam sheet with a thickness of 4.0 mm was heated in an oven at 120°C for 3 minutes, and then molded using two molds.
A sample with a thickness of 270 cm was created by pressing with a hydraulic pressure of 2.0 cm to create a wavy sample with a corrugated surface with protrusions facing different directions on the upper and lower surfaces, and an adhesion area of 30% (270 cm) on the upper and lower surfaces. The foam sheet of .0Il was used as a flat sample.

Next, as shown in FIG.
and the intermediate base plate 7, and a wave-shaped sample is disposed on the lower surface of the intermediate base plate 7 as the lower sound insulating material 1a,
Use Conicy's epoxy adhesive EPO-602 to
A four-layer floor laminate was constructed by bonding the two layers together.

The above-mentioned floor plan is glued onto the base 4 (concrete slab thickness 150 mm) on the second floor of the building using the aforementioned epoxy adhesive EPO-602 made by Nikoshi ■, and a tapping machine is applied on top of it. They were installed and evaluated for sound insulation and adhesive strength on the first floor.

In addition, regarding the durability of the floor, 1.5% from the top of the floor laminate
A static load of "kg/cm" was applied, and the amount of settlement of the floor laminate was measured and evaluated. The results are shown in Table 2.

As you can see, the sound insulation performance is sound insulation class L.
-55 was obtained, showing excellent sound insulation properties, and the adhesion of the wave-shaped sample is slightly smaller than that of the flat sample, which is 5.0 kg/cm2, since its adhesion area is only 30%. Although the weight was low at 4.0 kg/cm, there was material destruction on the peeled surface, so there was no problem in practical use.

In addition, regarding durability, the amount of floor settlement is 1.0 + ms*
The performance was satisfactory for practical use.

(Examples 2 to 5) Foams No. 2 to 5 were used, and the urine performance of each was evaluated using the same evaluation method as in Example 1.

The results are shown in Table 2.

In all cases, a sound insulation grade of L-55 was achieved, and there were no problems with adhesiveness, durability, etc.

(Examples 6 to 10) Using NO.3 foam and using the same evaluation method as in Example 1, the thickness and Similar experiments were conducted with various adhesion areas. The results are shown in Table 3.

As a result, the sound insulation performance gradually deteriorates as the bonding area of the corrugated sample increases, but the sound insulation grade L-55 is fully satisfied, and the thickness is 2. hm
Although the sound insulation performance is slightly lower when the thickness is 20.0 mm than when it is 10 mm, a practically satisfactory sound insulation rating of -55 is achieved.

(Example 11) In Example 1, instead of the flat sample with a thickness of 2.01 mm as the upper sound insulating material, a wavy sample with a thickness of 2.0 am and a surface area of 30 to 50% was used. , an experiment similar to this Example 1 was conducted. The results are shown in Table 3.

As is clear from this result, even if the adhesion area of the wave-shaped upper and lower sound insulation materials is both 50%,
Although the durability is slightly lower within the practical range than when the bonding area is smaller, it exhibits excellent sound insulation, durability, and adhesion.

(Example 12) In Example 1, the upper sound insulation material had a thickness of 2.0 IIm.
Instead of using a flat sample with a thickness of 2. hm, a flat sample with holes with 50% of the adhesive area was used.

Further, an experiment similar to that in Example 1 was conducted using a wave-shaped sample with an adhesive area of 50% as the lower sound insulating material.

The results are shown in Table 3.

As is clear from this result, although the sound insulation performance is slightly lower than when the adhesive area is less than 50%, it still achieves a sound insulation grade of L-55, which is fully satisfactory for practical purposes, and is an excellent sound insulation product. properties, durability and adhesion.

(Examples 13-14) Two types of wave-shaped samples with thicknesses of 4011 and lha were formed using NO. A floor laminate with a two-layer structure was obtained by bonding with a plywood floorboard, and the performance of each was evaluated using the same evaluation method as in Example 1. The results are shown in Table 4.

As is clear from this result, the overall evaluation is slightly inferior to that of the four-layer floor laminate; however, as can be seen from the comparison with the comparative example described later, when using a flat sound insulating material, It exhibits extremely superior sound insulation performance compared to other materials.

(Comparative Examples 1 and 2) Two flat samples with thicknesses of 4 mm and 10 mm were formed using NO03 foam, and these samples were made of plywood with a thickness of 91 mm as shown in Figure 2. A floor laminate with a two-layer structure was obtained by bonding with a manufactured floor board, and the performance of each was evaluated using the same evaluation method as in Example 1. The results are shown in Table 4.

As is clear from this result, when a flat foam is used as a sound insulating material, a practically satisfactory sound insulating performance cannot be obtained even if the thickness is increased.

(Comparative Examples 3 to 6) A wavy sample with a bonding area of 30%, whose upper and lower surfaces were wavy surfaces with protrusions facing the same direction, and a wavy sample with a thickness of 10 mm obtained from the foam of NO03, and a lower surface. A single-sided corrugated sample with a bonding area of 30% and a corrugated top surface only, and a flat plate porous sample with holes drilled so that the bonding area was 30% were prepared. As shown in Figure 2, it is laminated with a 9cm thick plywood floorboard. Floor laminates having an MI structure were obtained, and the performance of each was evaluated using the same evaluation method as in Example 1. The results are shown in Table 4.

As is clear from this result, even with a wave-shaped sound insulating material, if the corrugated surfaces are oriented in the same direction on the top and bottom surfaces, or if the corrugated surface is formed on only one side, the desired sound insulation performance cannot be achieved. cannot be obtained. The same applies to the case of a perforated plate.

[Effects of the Invention] As described above, according to the present invention, it is possible to use a thinner sound insulating material compared to conventionally known sound insulating materials, and the building floor can be improved without impairing durability, workability, walkability, etc. can significantly improve sound insulation properties.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the sound insulating material of the present invention;
The figure and FIG. 3 are cross-sectional views showing different usage examples thereof. 1 ・Sound insulation material, 2a, 2b ・Corrugated surface, 3
・Protrusion, 4 ・Air layer. 5. Building floor base, 6. Floor material, 7. Intermediate base plate.

Claims (1)

[Claims] 1. It is composed of a synthetic resin foam that contains polyolefin resin and inorganic powder and has a compressive modulus of elasticity of 20 to 50 kg/cm^2, and has a corrugated surface whose upper and lower surfaces face in different directions. Characteristic sound insulation material for building floors.