KR20100062050A - Sound-insulating material & slab construction method using the same - Google Patents

Abstract

PURPOSE: A sound-insulating material and a slab construction method using the same are provided to effectively prevent impact sound using hard urethane expanding foam and resin expanding foam. CONSTITUTION: A sound-insulating material(10) is composed of organic isocyanate, a foaming agent, a catalyst, a foam stabilizer, and polyol blend. A resin expanding foam is loaded on the top surface or the bottom surface of a hard urethane expanding foam(11). The resin expanding foam is a polyethylene expanding foam(12).

Description

Interlayer sound insulation material and floor construction method using same {Sound-Insulating Material & Slab Construction Method using the same}

The present invention relates to a sound insulation material developed by applying a rigid urethane foam to reduce the noise between floors of an apartment house, and has excellent physical properties such as cushioning, durability, workability, and heat insulation, and excellent sound insulation for other materials and price. In particular, the present invention relates to an interlayer sound insulation material capable of effectively absorbing, dispersing, and blocking noise and vibration generated by a floor impact, and a floor construction method using the interlayer sound insulation material.

Along with changes in housing conditions, securing housing performance for protecting users (residents) at home and abroad is emerging as a major issue. In Japan, in particular, the Enforcement of Quality Assurance Act was enacted in 2000, and the quality of the housing was announced in the process of supplying the housing, thereby inducing the supply and consumption of affordable housing according to the consumer's choice. In Korea, the overall quality and performance of MDUs are induced to meet the demands of the citizens to improve the quality of their homes, as well as to contribute to the development of a sound housing industry at the national level, as well as to contribute to the development of a sound housing industry at the national level. It has led to the introduction of an objective housing quality labeling system to promote the development of technology and the housing industry and to allow people to know and select the quality and performance of housing in advance.

Among them, the performance criteria related to the floor impact sound insulation performance in MDUs are prescribed in Article 14 (3) and (4) of the Regulations on Housing Construction Standards as follows.

Article 14 (Boundary Wall, etc. between Households)

③ The floor of the multi-family house shall be of any of the following subparagraphs:

1. The floor impact sound between floors should be less than 58 decibels for light impact sounds (comparatively light and hard impact sounds) and less than 50 decibels for heavy impact sounds (bottom impact sounds due to heavy and soft impacts). In this case, the floor impact sound shall be measured and determined by the Minister of Construction and Transportation, and the performance shall be verified by an organization designated by the Minister of Construction and Transportation regarding the structure.

2. It should be a standard floor structure determined and announced by the Minister of Construction and Transportation.

④ The Minister of Construction and Transportation may decide and notify the floor impact sound blocking performance class of MDU.

The current industry is conducting a variety of research and development to cope with the floor impact sound problem, which is emerging as a major factor that hinders the housing environment for the construction of multi-family housing that meets the above regulations. In particular, the development of a variety of sound insulation materials that are equipped with a shock insulation and a shock absorbing function on the floor slab is actively progressing.

For some examples of sound insulation materials, Korean Patent No. 166993 covers a rubber material in which an adhesive material is mixed on a slab, and a polyethylene foam sponge is laminated thereon to form a barrier layer, and then on the foam sponge. Disclosed is a floor construction method for forming a floor covering. In addition, Korean Patent Laid-Open Publication No. 2006-38862 discloses a thermoplastic foam having a foam ratio of 5 to 200 times and a foam cell of a specific diameter, which can be used as an interlayer noise suppression material of a building.

All of the prior art use a resin foam foam as a member for reducing the intercalation noise. Such resin foams have been conventionally installed for the purpose of thermal insulation or cushioning, and examples thereof include foams such as polyethylene, polystyrene, or polyvinyl chloride. However, in the case of the conventional foam as described above, but the degree of insulation or shock cushioning is achieved to some extent, the effect of absorbing, dispersing, and exhausting the floor impact sound that is the main cause of the intercalation noise was not satisfactory.

On the other hand, the Republic of Korea Patent Publication No. 2008-0027177 was developed to improve the above problems, the open cell rate is 20% or more (including 60% or more, including 80% or more), the dynamic modulus of 0.5 to 10MN / m ³ The present invention relates to an interlayer sound insulating material containing a phosphorus open cell-containing resin foam, and is effective in absorbing and exhausting noise and vibration generated by an impact. However, this has a problem that the loss coefficient is large because the elastic modulus is too low.

The sound insulation material has a function to block the shock vibration applied from the upper part on the transmission path, and is known to be particularly effective for reducing the light impact sound. The floor structure using sound insulation materials is called floating floor structure. Generally, the dynamic modulus and loss coefficient of sound insulation materials are considered to be a major factor in determining the noise reduction effect. However, if the dynamic modulus is low, the sound insulation performance is good, but the walking feeling is poor, and cracks are easily generated on the floor structure. If the dynamic modulus is high, the floor impact sound insulation is low. Therefore, it is necessary to develop a buffer considering the correlation between dynamic modulus and structural stability.

The present invention is made in consideration of the above-described prior art, by using a rigid urethane foam or a synthetic foam of a rigid urethane foam and a resin foam, interlayer sound insulation material that can effectively prevent floor impact sound and floor construction using the above It is an object to provide a method.

In order to solve the above problems, the present invention is made of organic isocyanate, blowing agent, catalyst, foam stabilizer and polyol blend as a material, the polyol blend is a polyether polyol in the polyester polyol 10 ~ 40wt% relative to the total polyol blend It provides an interlayer sound insulation material consisting of a rigid urethane foam produced by the foaming method using a mixture.

However, in order to improve sound insulation of the interlayer sound insulating material, a resin foam may be laminated on the upper or lower surface of the rigid urethane foam, and the resin foam may be polyurethane foam, polyurea foam, or polyvinyl chloride foam. , Polypropylene foam, polyethylene foam, polystyrene foam, polyvinylacetate foam, melamine resin foam, phenolic resin foam may be optionally applied.

In order to optimize sound insulation and durability of the interlayer sound insulating material, polyethylene foam is applied as the resin foam, and the thickness ratio of the rigid urethane foam and polyethylene foam may be 1: 0.2 to 1. By adopting such a configuration, it is desirable to have a dynamic elastic modulus of 5 to 40 MN / m 3, a loss coefficient of 0.1 to 0.3, and a density of 20 to 50. The sound insulation can be constructed.

In addition, the present invention provides a floor construction method comprising the step of constructing the interlayer sound insulation material on the slab, and further comprising the step of sequentially constructing the concrete layer, mortar layer and floor finish material on top of the interlayer sound insulation material constructed. Can be.

The present invention optimizes physical properties such as the dynamic modulus, thickness, and density of the rigid urethane foam included in the sound insulating material, and in some cases, by laminating a resin foam foam on one or both surfaces of the rigid urethane foam, The present invention provides an interlayer sound insulation material having excellent physical properties such as strength, workability, and heat insulation and good thermal insulation, and a floor construction method using the interlayer sound insulation material.

Rigid urethane foam is inexpensive and can be used for various purposes, but conventionally, there was no example in which the sound insulating material was composed of only rigid urethane foam. The inventors of the present invention focused on this point, and conducted research and development for applying a rigid urethane foam as a sound insulating material, and noted that the sound insulating material should consider not only sound insulation performance but also various physical properties such as physical strength, workability, and thermal insulation.

Accordingly, the present invention is made of an organic isocyanate, a blowing agent, a catalyst, a foam stabilizer and a polyol blend as a material, and the polyol blend is a mixture of polyether polyol in a polyester polyol at 10 to 40wt% based on the total polyol blend. Produced by using a foaming method, to provide an interlayer sound insulating material composed of a rigid urethane foam having a closed cellization rate of 80% or more.

The interlayer sound insulating material of the present invention is excellent in durability as a rigid structure with a closed cellization rate of 80% or more. In addition, when the closed cellization rate of the foam is high, thermal insulation properties are excellent due to low thermal conductivity of carbon dioxide, pentane, and CFC11 trapped inside the cell. Attached Figure 1 is an electron micrograph of the closed cell structure. The open cell, which is the structure opposite to the closed cell, is a concept that includes all open cells even at a part of the cell, and the foam having high open cell ratio has an excellent effect in terms of elasticity and sound insulation. If this is too low (oppositely high closed cell rate), sound insulation will fall. However, the interlayer sound insulation material according to the present invention has high closed cellization rate and excellent sound insulation performance as well as statutory sound insulation standards. Experimental data on this will be described later.

HCFC-141b (CCl2FCH3) may be used as the blowing agent, and the polyol blend may be a polyether polyol (at least one of various kinds) to a polyester polyol (adding one or more kinds of various kinds) as described above. 10 to 40 wt% of the added polyol brand is used. This is because if the polyether polyol content is less than 10wt%, the shrinkage and brittleness of the foam is increased, and if it exceeds 40wt%, the sound insulation performance is lowered. Conventionally, the rigid urethane foam has not been applied as a sound insulating material between buildings, but the use of the present invention could be newly expanded.

On the other hand, the sound insulation performance of the sound insulation material can be represented by the dynamic elastic modulus, the structural stability of the sound insulation material can be represented by the loss coefficient.

The dynamic modulus (s') is defined as the ratio of dynamic displacement to dynamic load and can be expressed as

S is the area of the test piece (㎡)
F is the dynamic load (N) applied perpendicular to the specimen
Δd is the dynamic change value of the specimen thickness (m)

The method of measuring the dynamic modulus is divided into the sine wave method and the pulse vibration method. The pulse vibration method calculates the dynamic modulus of elasticity per unit area from one of two methods: spectral analysis and time series analysis. It is possible in a way. The present invention uses a spectral analysis method.

S ' _t : Apparent dynamic modulus per unit area [MN / ㎥]
f ₀ : fundamental natural frequency of the vibrometer [Hz]
m: mass per unit area of the load plate [kg / ㎡]

The smaller the value, the better the sound insulation performance, and the following characteristics.

○ The dynamic modulus is proportional to the load per unit area applied to the specimen (fixed value)

Inversely proportional to the dynamic change in specimen thickness (corresponds to the softness of the material)

○ The value that influences the value of equation (3) is the natural frequency of the material.

○ The natural frequency of the material is determined by the degree of softness.

The loss coefficient refers to the degree to which the object absorbs energy when a load is given, and the smaller the value, the better the structural stability, and the following equation can be expressed.

The smaller the dynamic modulus of the sound insulation material, the larger the loss coefficient, and the smaller the loss modulus, the larger the elastic modulus. Can be interpreted as meaning. The present invention provides an interlayer sound insulating material having a structure in which a resin foam foam is laminated on the upper or lower surface of the rigid urethane foam as a method for controlling the dynamic modulus and loss coefficient of the rigid urethane foam to an appropriate level.

The resin foams include polyurethane foams, polyurea foams, polyvinyl chloride foams, polypropylene foams, polyethylene foams, polystyrene foams, polyvinylacetate foams, melamine resin foams, phenolic resin foams. Either one can be selectively applied. However, it is preferable that the polyethylene foam is applied as the resin foam, and the thickness ratio of the rigid urethane foam and the polyethylene foam is 1: 0.2-1.

According to the above technical idea, it is possible to obtain an interlayer sound insulating material having a dynamic modulus of 5 to 40 MN / m 3, a loss coefficient of 0.1 to 0.3, and a density of 20 to 50, within the range of the above-described dynamic modulus, loss coefficient, and density. It is possible to construct an interlayer sound insulation material with appropriate sound insulation and durability. The thickness of the interlayer sound insulating material is preferably 20 ~ 40cm, hereinafter will be described the physical properties data of the specific embodiment according to the sound insulation material composition content (thickness ratio of rigid urethane foam and polyethylene foam) on the basis of 30cm thickness.

[Table 1] Physical property data according to thickness ratio of PU and PE

※ PU: Rigid Urethane Foam, PE: Polyethylene Foam

The physical property data values shown in [Table 1] are shown in Example 2 (PE: PU thickness ratio = 1: 2, FIG. 2 (a)) and Example 3 (PE: PU thickness ratio = 1: 1, FIG. 2). (B) of Figure 3 shows the appropriate level of dynamic modulus and loss factor.

The inventors of the present invention performed a physical property test by thinking about the sound insulating material made of hard urethane foam, which is a low-cost material, and confirmed that the sound insulating performance having a dynamic modulus of 15.97 was reached as described in the following table.

However, rigid urethane foam has no restoring force when it is depressed by external impact due to the nature of the material. Therefore, in the present invention, another layer of resin foam is attempted as a layer for further improving the modulus of elasticity and protecting the rigid urethane foam. PE foam (polyethylene foam) has a low modulus of elasticity of 9.66, but cannot be used alone due to heat modification. Therefore, by stacking the PU foam and PE foam, the effect of improving the structural stability and sound insulation performance was obtained. The reason for obtaining the stability to heat is that the heat-insulating material, which is weak in heat because of the high temperature heating pipe in the floor structure, does not exhibit its performance due to deterioration after initial construction.

[Table 2] Property data change after heat treatment

※ Heat treatment is KS M ISO 1796 (hard foamed plastic test method) in accordance with KS M ISO 4898 (hard foam plastic-building insulation specification). After this heat treatment, the volume change should be within 5%.

[Table 2] shows the change value of the interlayer sound insulation material properties data after the heat treatment proceeded for 48 hours at 70 ℃. Example 2 (PE: PU thickness ratio = 1: 2, see Fig. 2 (a)) and Example 3 (PE: PU thickness ratio = 1: 1, see Fig. 2 (b)) physical properties of the heat treatment Although it was found that the change value was not large, Example 3 exhibited some warpage in appearance. Since the polyethylene foam is inherently weak in heat, the bending occurs in the third embodiment where the proportion of the polyethylene foam is relatively large, and the rigid urethane foam serves to compensate for the above weakness due to its durability.

According to [Table 1], the fifth embodiment is the best in terms of sound insulation, but due to heat deflection, the shape of the fifth embodiment is not maintained, and the third and fourth embodiments also have some deflections. It could not be maintained.

Therefore, Example 2 was set as an optimal example, and when the floor impact sound test on the floor constructed with the structure of [FIG. 3] was requested to the Korea Institute of Construction Materials Testing, the light impact sound was 45 dB and the weight impact sound was 47 dB. In this test, the thicknesses of slab, sound insulation material, (light foam) concrete layer and mortar layer were constructed at 180, 30, 40, and 40 mm, respectively.) Since the impact sound is 50 dB or less, the interlayer sound insulation material according to the present invention was determined to have sound insulation performance superior to the legal standard.

On the other hand, the present invention provides an interlayer sound insulating material, characterized in that the thermal conductivity is 0.019 to 0.030 Pa / mh ℃.

Thermal conductivity (λ) refers to the transfer of heat from the front surface of the material to the back surface, and the amount of heat transferred for 1 hour from the front surface of the material 1m thick and 1㎡ to the rear surface by 1 ° C temperature difference (㎉ / mh ℃). Say). The lower the thermal conductivity is, the better the thermal insulation. Generally, the thermal conductivity of EPS (Styrofoam), which is widely used as a heat insulator, is 0.031㎉ / mh ℃ in Styropol (Styropol No. 1) with a density of 30㎏ / ㎥ or more, density 25 ~ 30㎏. Styropol (Styropol No. 4) at 0.032mh / mh ℃ in Styropol (Styropole No. 2) / m 3, Styropol (Styropole No. 3) in Density 20-30 kg / ㎥ ) Is 0.037 dB / mh ° C.

However, as a result of testing the thermal conductivity of several embodiments of the interlayer sound insulating material according to the present invention confirmed the results of the following [Table 3], which shows the excellent heat insulation than the existing heat insulating material.

[Table 3] Thermal conductivity according to thickness ratio of PU and PE

※ PU: Rigid Urethane Foam, PE: Polyethylene Foam

The present invention also provides a floor construction method comprising the step of constructing an interlayer sound insulating material according to the present invention on a slab, which includes the steps of sequentially constructing a concrete layer, mortar layer and a floor finish on top of the interlayer sound insulating material. It may further comprise.

Attached Figure 3 shows one aspect of the floor construction structure formed by the construction method as described above. Specifically, FIG. 3 illustrates a state in which an interlayer sound insulating material, a concrete layer, and a mortar layer are sequentially installed on the slab, and the symbol W represents a wall of a building. As shown in Figure 3 the interlayer sound insulation material according to the invention is installed on the slab, through which the impact sound or vibration is blocked. In general, the concrete layer is preferably formed by pouring and curing lightweight foam concrete, and the mortar layer is embedded with a pipe for heating or gas piping. Such a specific construction method of each step of the method of the present invention is not particularly limited, and can be easily performed using a general construction method in the art.

1 is an electron micrograph (SEM) of a rigid urethane foam applied to the present invention.

2 is a cross-sectional view of the interlayer sound insulating material according to the present invention.

3 is a cross-sectional view of a building floor structure to which the interlayer sound insulation material of the present invention is applied.

<Explanation of symbols for the main parts of the drawings>

10: interlayer sound insulation

11: hard urethane foam 12: polyethylene foam

20: concrete layer 30: mortar layer

S: Slab W: Wall

P: Pipe

Claims (8)

Organic isocyanate, foaming agent, catalyst, foam stabilizer and a polyol blend is made of a material, the polyol blend is a method of foaming using a polyester polyol polyether polyol in a mixture of 10 to 40wt% relative to the total polyol blend Interlayer sound insulation material made of rigid urethane foam having a closed cellization rate of 80% or more. The method of claim 1, An interlayer sound insulating material, wherein the thermal conductivity is 0.019 to 0.030 Pa / mh ° C. The method of claim 1, An interlayer sound insulating material comprising a resin foam foam laminated on the upper or lower surface of the rigid urethane foam. The method of claim 3, The resin foam is a polyurethane foam, polyurea foam, polyvinyl chloride foam, polypropylene foam, polyethylene foam, polystyrene foam, polyvinylacetate foam, melamine resin foam, phenolic resin foam Interlayer sound insulation material, characterized in that any one. The method of claim 4, wherein The resin foam is a polyethylene foam, The thickness ratio of the rigid urethane foam and polyethylene foam is 1: 0.1 ~ 1 interlayer sound insulating material, characterized in that. The method of claim 5, An interlayer sound insulating material, characterized by having a dynamic modulus of 5 to 40 MN / m 3, a loss coefficient of 0.1 to 0.3, and a density of 20 to 50. A floor construction method comprising the step of installing the interlayer sound insulation of any one of claims 1 to 6 on a slab. The method of claim 7, wherein Floor construction method further comprising the step of sequentially constructing a concrete layer, mortar layer on top of the interlayer sound insulation material constructed.

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