JPH02190563A - Manufacture of vibration controlling material and buffer material - Google Patents

Abstract

PURPOSE:To obtain a vibration controlling material and a buffer material having high function of vibration control and buffer by dispersing a flake and a polymer compound as a foam forming material, and using a polymer compound water dispersing liquid containing flakes more than a specific amount. CONSTITUTION:As a foam forming material, a flake such as a mica and the like and a polymer compound are dispersed, and polymer compound water dispersing liquid containing flakes more than 100 weight against polymer compound solid 100 weight is manufactured. Then, the material is foamed and treated, for example, it is applied to the surface of a nonwoven fabric and the like by means of a roll-coator and the like, a sheet with a proper thickness is formed, and a vibration controlling and buffer materials are completed by drying and bridging it. By using emulsion the polymer composed of into water, it is so functioned that the viscosity of the water dispersing liquid does not rise even though a large amount of flakes is mixed. Accordingly, the vibration controlling and buffer materials can be easily obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a vibration damping/buffering material used for soundproof floors and the like.

[Conventional technology]

Conventionally, the floors of housing complexes (for example, condominiums) have often been covered with carpets. However, car vents are prone to dust mites, which poses hygiene problems, and maintenance such as cleaning is difficult, so in recent years, wooden flooring has been replacing the flooring.

[Problem to be solved by the invention]

However, with wooden floors, the following problems are becoming apparent.

When the floor is carpeted, there is little floor impact sound that can be transmitted to the lower floor, but if the floor is hard like wood, even the slightest thing can cause the floor impact sound to be transmitted to the lower floor. Even impact sounds such as footsteps or falling spoons can be easily transmitted to the lower floors and cause noise.

In addition, in the case of wooden floors, when people doing aerobics or jazz dancing jump up and down, they receive a large reaction force from the floor, causing significant leg fatigue and knee pain.

Furthermore, with the introduction of electronic equipment and a review of the human environment, there is a trend toward minimizing the effects of vibrations on machines that generate vibrations, such as automobiles.

Conventionally, foamed urethane has been used as a distribution/i-side material, but its distribution/@city functions cannot be said to be sufficient.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a method for easily manufacturing a vibration damping/cushioning material that exhibits sufficient damping/damping functions.

[Means to solve the problem]

In order to solve the above-mentioned problems, in the present invention, when producing a shock absorbing material made of a foam of a polymer material and containing flakes, flakes and a polymer compound are dispersed as raw materials for forming the foam, and the flakes are highly Molecular compound solid content 10
An aqueous dispersion of a polymer compound containing 100 parts by weight or more relative to 0 parts by weight is used.

[For production]

The distribution/buffering material obtained by the manufacturing method of the present invention exhibits sufficient vibration damping/buffering functions. This is because the foam prolongs the impact time due to its elasticity and causes a loss of impact energy due to the viscosity of the foam. This is because the loss increases the loss coefficient for the entire sheet.

Obtaining a foam with a high flake content is a waste of conventional manufacturing methods. In other words, the foam-forming raw materials used in the past have a high viscosity, so when flakes are added, the viscosity becomes too high and cannot be molded.In contrast, in this invention, the foam-forming raw material Since an aqueous dispersion is used, for example, a suspension in which a urethane resin solid (a polymeric compound) is dispersed in water, or an emulsion in which a styrene-butadiene rubber liquid (a polymeric compound) is dispersed in water, the viscosity Since the viscosity of the aqueous dispersion does not increase significantly even when a large amount of flakes is mixed in, a foam can be easily obtained.

〔Example〕

Hereinafter, the method for manufacturing an allocation/buffer material according to the present invention will be described in detail based on examples thereof.

First, flakes and a polymer compound are dispersed as raw materials for forming a foam, and the flakes are mixed with a polymer compound solid content of 1
An aqueous dispersion of a polymer compound containing 100 parts by weight or more per 00 parts by weight is prepared. Note that it is usually preferable that the amount of flakes mixed in does not exceed 300 parts by weight per 100 parts by weight of the solid content of the polymer compound. This is because the viscosity becomes too high and molding becomes difficult.

For example, suspensions in which urethane polymers (solid small molecules) made of polymerized adducts obtained by hydrolyzing isocyanates and polyols are dispersed in water, or resin liquids such as styrene-butadiene rubber (SBR). is dispersed in water (for rubber compounds,
The raw material can be created by mixing and dispersing flakes in (often called latex). At this time, commonly used foaming aids and crosslinking agents may be added.

In the case of urethane suspension, the air cell auxiliary agent is
For example, stearate is used, and the crosslinking agent is, for example, an epoxy crosslinking agent.

The urethane polymer aqueous dispersion has a solid content of approximately 50% by weight out of 10% (10%) of this liquid, and has a low viscosity (20%).
00 to 12,000 cps), the increase in viscosity caused by adding flakes is not a problem at all. relatively soft D
Foams with high tE effect can be made. On the other hand, the so-called conventional two-component urethane type raw material has a high viscosity, and when flakes are added, the viscosity becomes too high, making it difficult to mold. In the case of this two-component urethane type, polyol and isocyanate to which a foaming liquid such as Freon is added are subjected to a hydrolysis reaction, polymerized while bonding with urethane, and the foaming liquid is gasified by heat to produce foamed urethane.

Note that, assuming that the aqueous polymer compound dispersion (before adding flakes) is 100% by weight, the resin solid content is 40 to 60% by weight.

Next, the raw material thus obtained is foamed. Examples of the foaming treatment include mechanical foaming treatment using a hand mixer or the like. Of course, it goes without saying that the process for forming a foam in the present invention is not limited to this.

Next, the foamed raw material is applied to the surface of a sheet-like material such as non-woven fabric 3 using a roll coater or knife coater, formed into a sheet of an appropriate thickness, and dried (moisture removed). Bridge it to complete the vibration control/buffer company name.

In addition to the above-mentioned urethane and SBR, the polymer compound may be natural rubber, natural rubber+SBR, polyethylene, vinyl chloride, polybutadiene, acrylonitrile-butadiene rubber (NBR), or the like.

The expansion ratio of the foam is, for example, about 2 to 20 times.

The thickness of the vibration damping/cushioning material obtained by the manufacturing method of this invention is:
Usually, it is about 0.5 to 10 tm.

Examples of flakes include micas (mica) such as phlogopite, biotite, and muscovite, talc, pyrophyllite, chlorite, montmorillonite, kaolin, serpentine, hallosite, vermiculite, vermiculite, and the like. The flakes used have an average aspect ratio (average particle size/average thickness) of about 30 to 300. The average particle size of the flakes is 0.00
It is preferable that the particle size is about 1 to 5 wi+, and the particle size is about the same as the pore size of the foam.

Next, a soundproof floor, which is one example of the application of the distribution/buffer material obtained by the manufacturing method of the present invention, will be explained.

The soundproof floor shown in Fig. 1 is installed on a concrete slab F, and consists of a top plate 1 and a vibration damping/buffering material 2. The damping/buffering material 2 is installed closely on the back side of the top plate 1. The structure is as follows.

The surface plate 1 is made of lauan plywood with a thickness of 2.5 mm. Allocation/B
The jE material 2 consists of a foam 2b formed on a 100 μl thick polyester nonwoven fabric 2a. The foam 2b has a thickness of 5
+n, the foaming ratio is 3 times, it is urethane foam,
As flakes 2c, phlogopite with an average particle size of 1°4 fins and an average aspect ratio of 90 is 10% by weight per 100 parts by weight of urethane resin.
0 parts by weight are mixed. In addition, when there are many flakes 2c protruding into the pores (vesicles) of the foam, the impact energy is absorbed as vibration energy of the flakes, and the vibration/MHE effect is more sufficient.

The vibration damping characteristics of this soundproof floor are shown by the solid line a in FIG. In the graph in Figure 2, the vertical axis is vibration attenuation (dB) and the horizontal axis is frequency (Hz), which is transmitted to the back side of slab F when hit with the standard impact sound (light impact) specified by the JIS standard. It shows how much the amount of vibration has decreased compared to the amount of vibration transmitted to the back surface of the slab F when the surface of the slab F is directly struck. Further, the vibration damping characteristics of a soundproof floor having the same structure as that shown in FIG. 1 except that flakes are not mixed in the foam are shown in broken lines in FIG.

It is clearly seen that the soundproof floor using the distribution/buffering material of the example has a large amount of vibration attenuation particularly in the low frequency range, which is a problem, and exhibits excellent vibration damping/buffering functions.

The floor impact sound levels according to JIS standards for both of the above soundproof floors are shown in Figure 3. Broken lines L-55, L-50, L-45
If the floor impact sound level is lower than the value shown in , the 0 curve A, which satisfies the relevant value of the JIS standard (JIS A 1419), is for the soundproof floor using the distribution and cushioning material of the example, L-46 has a high sound insulation function, whereas curve B is for a comparative soundproof floor, L-4.
It remains at a low level of 8.

It was confirmed that a soundproofing floor using styrene-butadiene rubber latex instead of the urethane suspension as the foam had the same soundproofing performance as the above soundproofing floor.

Note that the soundproof floor in which the vibration damping/cushioning material of the present invention is used may have the following configuration.

One is a soundproof floor in which the distribution and cushioning material is not formed on a non-woven fabric (or directly formed on the back side of the top board).

The other type, as shown in Fig. 4, is a soundproof floor in which a lower board 3 such as plywood or resin board is provided between the distribution/buffer material and the slab. The lower plate 3 is provided with a male fruit 3a and a female fruit 3b for connection on its end surface. This soundproof floor is easy to connect and install, and has a high strength because of the bottom plate.

In the case of the above soundproof floor, the top board is 1 to 10 cm, and the bottom board is 3 to 10 cm.
A thickness of about 15fl is used.

The distribution/buffering material obtained by the manufacturing method of the present invention can also be used as a sound absorbing material and the like.

〔Effect of the invention〕

As described above, in the manufacturing method of the present invention, flakes and a polymer compound are dispersed as raw materials for forming a foam, and a polymer containing 100 parts by weight or more of the flakes per 100 parts by weight of the solid content of the polymer compound is used. Since the molecular compound aqueous dispersion is used, it is possible to easily obtain a vibration damping/buffering material that contains a sufficient amount of flakes and exhibits high damping/buffering functions.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing the structure of a soundproof floor using an example of the distribution/buffer material of the present invention, and Fig. 2 is a graph showing the vibration damping characteristics of this soundproof floor and a comparative soundproof floor. , Fig. 3 is a graph showing the floor impact sound levels of these soundproof floors, and Fig. 4 is a schematic cross-section showing the structure of a soundproof floor using another example of the damping/cushioning material of the present invention. It is a diagram. 2... Allocation/buffer material 2b... Foam 2c.
··flake

Claims (1)

[Claims] 1. Vibration damping material made of polymeric foam and containing flakes.
In obtaining the cushioning material, an aqueous polymer compound dispersion in which flakes and a polymer compound are dispersed and containing 100 parts by weight or more of the flakes per 100 parts by weight of the solid content of the polymer compound is used as a raw material for forming the foam. A method for manufacturing a vibration damping/cushioning material.