JPH0546419B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a damping floor member, and particularly to a damping floor member for direct attachment. As a result of intensive research into floor materials with excellent floor impact noise mitigation performance, the inventors of the present invention have developed the following cross-linked viscoelastic material by using an air-filled film base material with concave and convex portions as a floor constituent material. It was confirmed that the effect of mitigating floor impact noise was significant, and that the effect of mitigating floor impact noise was further improved by providing a damping function to the uneven absorbing material, and the present invention was completed. This is what I have come to do. The air-filled film with a crosslinked viscoelastic body, which is a vibration damping floor member of the present invention, utilizes the vibration damping properties of an air layer in combination with a crosslinked viscoelastic body that has excellent vibration damping properties and compression properties. It combines uneven absorbing material on the sides, which also has a vibration damping function. (Conventional technology) Technological progress regarding this type of vibration-damping floor members has been remarkable in recent years, and the remaining issues in the architectural field are:
It is said that the current situation is narrowing down to two points: condensation and sound/vibration. In recent years, various countermeasures have been taken to address the problem of sound and vibration, and although improvements have been made, there are still many areas where sufficient effects cannot be achieved due to technical difficulties. Flooring materials are an example of this, and although various studies have been conducted, there is currently no material that exhibits good performance. In other words, among flooring materials, there are many residents who request wooden flooring because of its advantages such as being able to maintain cleanliness, being difficult for pests such as mold and mites to inhabit, and having a calm color tone. It has increased. (Problem to be Solved by the Invention) However, the only drawback of wooden flooring is that it cannot at all dampen floor impact noise against the sound of walking on the floor or the sound of falling objects, and considering the inconvenience to the people living downstairs, Currently, wooden floors cannot be used on the upper floors. As is conventionally known, it is known that floor impact noise can be easily alleviated by using a material that can be compressed and deformed easily even under small stress, such as felt. . On the other hand, materials with such performance undergo too large a compression deformation, so if a floor material that requires a smooth finish, such as a wooden floor, is used, distortion may occur even at the height of furniture, etc. This results in a fatal drawback that smoothness cannot be maintained. Therefore, the measures currently being taken to counter floor impact noise are compressed glass wool,
The floor is constructed by combining several types of asbestos, wood chips, cement boards, rubber boards, inorganic board materials, plywood, etc., or by raising these combinations above the floor slabs, and also by putting sound-absorbing materials in the space between the floor slabs and the ceiling. In some cases, the ceiling is made of anti-vibration rubber to create a suspended ceiling, and floor impact noise is currently mitigated by the overall effect of the floor and ceiling. However, the method requires a large number of raw materials and high raw material costs. There is a lot of material loss during construction. The cost increases due to the large number of construction steps. In addition, the total thickness of the floor members for alleviating floor impact noise becomes extremely thick, and if buildings are kept at the same eave height, the living space must be made narrower or the number of floors must be reduced. On the other hand, if buildings have the same number of floors and the same living space, the disadvantage is that the increased height of the eaves will add to the construction cost of the building. The present inventors solved the above-mentioned drawbacks,
Numerous trials were conducted with the goal of creating a restraining type vibration-damping flooring material for direct attachment that can reduce floor impact noise at low cost, is thin, and can be directly attached, and can reduce floor impact noise even when finished with wood flooring. After repeated mistakes, we discovered that liquid rubber, which can be reacted at room temperature to form a crosslinked viscoelastic material, and a film base material with air-enclosed parts both have excellent floor impact sound mitigation performance when used alone. As a result of various tests, we found that JP-A-Sho not only has the ability to further reduce floor impact noise but also eliminates the drawbacks of using it alone.
62-253866 has been completed. According to the method described above, it is possible to provide a vibration-damping floor that is almost satisfactory, but the present invention was completed as a result of trial and error in order to further improve the construction surface, finish feel, and vibration-damping properties. That is, the present inventors further repeated trial and error in an attempt to improve the above method, and found that a foam net-like material with a thickness of 1 mm to 10 mm was used as an uneven absorbing material with a vibration damping function, or as an uneven absorbing material with a vibration damping function. By combining the method disclosed in JP-A No. 62-253866 as a component, not only the floor impact sound mitigation performance is significantly improved, but also stable adhesion can be obtained on the construction surface. As a result, we have found that the finish quality can be further improved. In other words, when liquid rubber is used alone to obtain a crosslinked viscoelastic body through room-temperature reaction, it is expensive and unsuitable for general-purpose flooring, and when reacted between plate-shaped restraining materials, However, unless a large amount of material is used and a method is used to extrude the excess material, large cavities tend to occur randomly, resulting in product variations. On the other hand, when using a film base material with an air-filled part alone, if there is no material to protect the convex thin film, the film will easily break if pressure is applied locally, and it may become a part of the flooring material. It has the disadvantage that it is not a material that can be used in layered form.
Furthermore, among film base materials, those covered with a thin film not only on one side but also on both sides have a slightly higher load capacity than single-sided film products, but are not materials that can be used in a layered manner as flooring materials. Also, plastic cardboard with enclosed air is known,
Materials with increased surface film thickness and overall rigidity not only have the fatal disadvantage as flooring materials of buckling under unexpectedly small stress and not restoring when a compressive load is applied. It also has the disadvantage of poor impact sound mitigation performance. In order to eliminate the above drawbacks, if a polyolefin foam sheet is pasted on one or both sides, the floor impact noise reduction performance will be improved, but if a plastic cardboard pole with sealed air is used, There is no difference at all from when the polyolefin foam sheet is not bonded, and even during compression, if the deformation limit of the polyolefin foam sheet is exceeded, it will buckle and will not restore its original shape, as in the case where the polyolefin foam sheet is not laminated. After repeating trial and error in order to solve both of the above-mentioned drawbacks, the present inventors applied a liquid rubber that can obtain a crosslinked viscoelastic body by reaction at room temperature to the recesses and/or the entire surface of a film base material having an air-enclosed portion. It was discovered that by filling this material with carbon dioxide, it is possible to obtain a floor material with excellent floor impact sound mitigation performance and very good compression properties as a floor material. The present invention provides a constraint-type vibration damping floor member for direct attachment, in which convex portions filled with air and concave portions made only of film are alternately disposed on the entire surface of a concave portion including concave portions and/or convex portions of a film base material. , an air-filled film base material with a crosslinked viscoelastic material filled with a crosslinked viscoelastic material is used as one member of the floor component, a wooden flooring board is placed above this as an upper restraining material, and a wooden flooring board is placed below it as a lower restraining material. The present invention relates to a restraining type vibration damping floor member for direct attachment, characterized in that plywood is laminated together, and an uneven absorbing material made of a foam net-like material is further combined with the plywood. In the damping floor member of the present invention, the ratio of the volume of air in the convex portions containing air to the volume of the crosslinked viscoelastic body filled in the concave portions made only of film is 2:8 (convex portions:concave portions).
~8:2, the height of the convex portion is 6 mm or less,
The cross-linked viscoelastic material that fills the entire surface of the recesses including the recesses and/or protrusions is a main ingredient whose basic component is a telechelic polymer having hydroxyl groups at the end, and a curing agent having two or more isocyanate groups per molecule at room temperature. It is preferable that the material be obtained by a curing reaction. The damping floor member of the present invention is a cross-linked viscoelastic material that fills the entire surface of the recesses including the recesses and/or projections of a film base material in which convex portions filled with air and recessed portions made only of film are arranged alternately. However, the main ingredients are hydroxyl-terminated liquid polybutadiene, asphalt, and a plasticizer, and 2 isocyanate groups per molecule.
It is preferable that the material be obtained by causing a curing reaction at room temperature with a curing agent having at least one of the following. In the present invention, the crosslinked viscoelastic body undergoes a curing reaction at room temperature, and the product after the curing reaction is 80%
It retains its shape even when heated to ℃, and its hardness at 20℃ is C as specified by the Japan Rubber Association standard SRIS-0101.
It is preferable to meet the following three conditions: 50 or less on a mold hardness tester. In the present invention, the uneven absorbing material is 1 mm to 10 mm
It is preferable that the material is made of a foam net-like material having a thickness of 10 to 70 times, a foaming ratio of 10 times to 70 times, and a space area formed by the mesh of 1 mm ² to 1000 mm ² . (Function) In the present invention, the reason why the hardness of the crosslinked viscoelastic body is set to 50 or less is as follows. The crosslinked viscoelastic body is a crosslinked rubber with very low hardness, and the low hardness of this crosslinked rubber makes it impossible to measure with a normal rubber hardness meter. Therefore, according to the Japan Rubber Association standard STIS-0101, which is a hardness measurement method often used for rubber sponges, it is a desirable condition to achieve the present invention that the hardness is 50 or less when measured with a C-type hardness meter. . In order to suppress problems with the lower limit under the condition that the temperature is 50 or less, we set the condition that ``the material produced after the curing reaction retains its shape even when heated to 80℃'', thereby preventing curing failure or This was limited to prevent the lack of restorability due to plastic flow. That is, by setting the above upper and lower limit conditions, a viscoelastic body suitable for achieving the present invention is defined. In the present invention, the thickness of the foam network is 1 mm or more.
The reason why the foaming ratio was set to 10 mm, the expansion ratio was set to 10 times to 70 times, and the space formed by the mesh was set to 1 mm ² to 1000 mm ² is as follows. If the thickness of the foam net is less than 1 mm, the effect of absorbing unevenness will be poor, the amount of displacement for shock absorption will be small, and the vibration damping function will be poor, so it is inappropriate to have a thickness of less than 1 mm. On the other hand, if the thickness is 10 mm or more, the vibration damping performance and unevenness absorption effect are excellent, but the cost is high and the total thickness of the floor material increases. This is not preferable because it has drawbacks such as the amount of displacement caused by walking becoming too large. Further, when the foaming ratio is less than 10 times, the effect of absorbing unevenness is poor and the vibration damping performance is also deteriorated, so a foaming ratio of less than 10 times is inappropriate. On the other hand, if it is 70 times or more, it is inappropriate because the amount of displacement during walking becomes too large, the compression set due to the load becomes large, and the damping performance gradually deteriorates over time. Next, the spatial surface formed by the mesh is 1 mm ² ~
The basis for setting it as 1000mm ² is as follows. If the area of the space formed by the mesh is less than 1 ^mm2 , it is inappropriate because the foam strings forming each mesh will stick to each other even with a small amount of displacement, making it difficult to obtain a sufficient amount of displacement. On the other hand, if the space area is 1000 mm ² or more, the amount of deformation becomes too large, and the disadvantage is that the material is susceptible to compression set, which is not preferable. In addition, in the present invention, to explain the major feature of using a net-like material, the intersection points of the net-like material overlap, making it twice the thickness or twice the density of a single mesh. It touches the floor structure at a point. In other words, these are ideal conditions for vibration isolation. Therefore, when an impact is applied such as when an object falls to the floor or when walking, the intersection points are crushed and the deformation energy is alleviated by each string-like object. Since it is necessary to have a mechanism that can receive deformation energy in the state and disperse stress over a larger area, it is possible to obtain a floor impact sound reduction effect that could not be obtained conventionally when using a string-like object. be. The reason why the restraint-type damping floor member for direct attachment of the present invention has excellent floor impact sound mitigation performance is that the air-filled portion becomes an air bag and is easily compressed and deformed, and the viscoelastic body filled in the recessed portion is made of a film base material. In addition to the impact energy absorption performance of the viscoelastic body itself, the deformation of the convex portion of the film that forms the air bag and the shear between the crosslinked viscoelastic body and the crosslinked viscoelastic body It is thought that the impact energy absorption performance was further increased by increasing the number of deformed parts. In addition, in terms of compression characteristics, when an impact is applied, the air bladder, which is a convex part of the film, is compressed, and the viscoelastic body is further compressed, so it easily deforms with a very small displacement, but under a constant load. For the above compression, the reaction force of the compressed air in the convex air bag,
Since the compressive reaction force of the crosslinked viscoelastic body acts and a larger force is required to increase the deformation, more displacement than necessary can be avoided.
Furthermore, when the compressive load is removed, the restoring force of the cross-linked viscoelastic body and the restoring force of the compressed convex air bladders are combined, resulting in a very quick recovery force. It was done. Furthermore, even if the material is cross-linked, the cross-linked viscoelastic material tends to be susceptible to changes in hardness due to temperature changes, but at high temperatures, air expansion can suppress the decrease in compressive force due to the decrease in hardness of the viscoelastic material. On the other hand, at low temperatures, the shrinkage of air can suppress the increase in compressive strength due to increased hardness of the viscoelastic body, and it also has the advantage of being used as a vibration damping floor member in that it reduces changes in performance due to temperature changes. In addition, in terms of cost, since one side is a film, handling is very easy, and long length processing is also possible, which not only greatly reduces the number of man-hours, but also reduces the number of convex parts. Since the air sealing part does not require any material, it is possible to reduce the amount of material, which is suitable for cost reduction. Furthermore, by using a foam net as an uneven absorbing material, it can easily follow the unevenness of the base structure, and the effective bonding area can be increased, resulting in a better finish as a wood flooring material and providing long-term stability. It is not long enough to provide the desired performance, making it difficult for vibrations to be transmitted to the floor slab, making it extremely effective in alleviating floor impact noise. Moreover, it is an inexpensive material and has very little cost increase, making it very useful. Next, the cross-sectional structure of a floor using the restraint-type damping floor member for direct attachment of the present invention will be described. As shown in FIGS. 1 and 3, a relatively rigid plate-like material is bonded to both sides of a crosslinked viscoelastic hollow film base material as a restraining material, and a foam network material is then bonded to a non-uniform absorbent material or As shown in Figure 2, the film base material filled with a cross-linked viscoelastic material and the foam net are directly laminated together to be used as a constraint-type vibration damping flooring material. There is a way to do this. In addition, there is no problem whether the film base material with a crosslinked viscoelastic material is used with the film surface as the top surface or as the bottom surface. Alternatively, a film or nonwoven fabric may be further laminated on the surface of the crosslinked viscoelastic material. Next, the floor components will be explained step by step. Examples of finishing materials include wood floor finishing materials, vinyl chloride floor finishing materials, and cork tiles, which are currently used as floor finishing materials. Wooden flooring materials include flooring boards, flooring blocks, single-layer flooring made of mosaic parquet, natural wood decorative composite flooring, specially processed decorative composite flooring, natural wood decorative composite blocks, composite flooring made of specially processed decorative composite blocks, and sawn wood flooring. Examples include flooring made of boards, boards, cork, and laminated layers.
For these, it is preferable to make the plate layer thinner in order to alleviate floor impact noise. Specific examples of restraining materials include the aforementioned wooden flooring materials, plywood, compressed paper, plastic boards, thin metal boards, particle boards, wood chip cement boards, fiber boards, pulp cement boards, wood wool cement boards, flexible boards, and soft flexible boards. Boards, large flat plates, asbestos cement boards, asbestos cement perlite boards, asbestos cement calcium silicate boards, plaster boards, etc. are all board-shaped, regardless of the presence or absence of decorative finishing on the surface and the presence or absence of holes. However, if the purpose is to reduce the total thickness of the floor component, a thinner plate is preferable. Note that the restraining material and the substrate are made of the same material, and the opposite side of the substrate to which the impact is applied, that is, the wooden flooring board, serves as the restraining material, and when the impact is applied from the opposite side, the substrate serves as the restraining material. Therefore, when the restraining material and the substrate are excited by the restraining material, they are in exactly the opposite state, and the substrate acts as the restraining material and the restraining material acts as the substrate, so it is difficult to distinguish between the restraining material and the substrate. Although it cannot be used as a restraining material, it is generally referred to as a restraining material or a substrate. Next, the uneven absorbing material will be explained. Examples of suitable non-uniform absorbent materials for the present invention include chloroprene, various synthetic rubbers including EPT, polyethylene, polypropylene, polysterene, polyurethane, ethylene-vinyl acetate copolymers, etc. as the main polymer of the foam. It is preferable that the basic polymer is a polymer or a combination of two or more types, and the expansion ratio of the foam is 10 to 10.
70% is desirable. Also, as shown in Figures 5 and 6, a foam net-like material is one in which string-like materials are combined vertically as shown in Figure 5, or on the same plane as in Figure 6. It may be molded into a net-like material. In addition, the cross-sectional shape of the string-like material constituting the net-like material is circular, elliptical,
It may be square, triangular or other shape. Next, the suitable dimensions for the space part of the mesh are 1 mm ² to 1000 mm ² when the space is open like a mesh, but when sharing this with other items, the mesh should be shortened. It may also be used in the fully opened state. Depending on each material, foaming ratio, and thickness, ease of exhibiting uneven absorption performance, ease of adhesion to floor slabs, ease of exhibiting vibration damping performance, and difficulty in causing compression settling are determined on a case-by-case basis. Although it is necessary to change the position and select the optimal location, the following can generally be said. In other words, when the mesh spacing is small or when the expansion ratio of the foam is relatively small, a taut state is preferable, but
On the other hand, when the mesh spacing is large and the expansion ratio is large, it is preferable to use it with a reduced mesh size. By using the foam reticulate material as described above, the ability to absorb the unevenness of the base, which is a key point in the construction of direct adhesive flooring, has been significantly improved, making it possible to achieve a beautiful finish. In addition, as for adhesive performance, point adhesion and line adhesion were used more effectively than when used on a flat surface, and it was found that the effective adhesion area could be increased, and the adhesion was more reliable. Furthermore, for the purpose of improving vibration damping properties, the foam reticulated material according to the present invention can be used as a part of a floor cross-section component, for example, by placing it directly under finished wood flooring and laminating it with a crosslinked viscoelastic film. It is also possible. Further, the foam net-like material shown in the present invention is highly effective when used in combination with a foam sheet as a measure against moisture from the surface of a concrete slab. Next, the crosslinked viscoelastic material will be explained. The cross-linked viscoelastic material referred to in the present invention is liquid at room temperature, and after reacting at room temperature, the cured product retains its shape even when heated to 80°C, and has a hardness of Nippon Rubber at 20°C. It is preferable that the hardness satisfies the condition of 50 or less on a C-type hardness tester as shown in the association standard SRIS-0101. Examples of reactive substances that can satisfy the above conditions include combinations of a liquid rubber having a functional group shown in Table 1 and a crosslinking agent.
Considering the ease of controlling curing speed, cost, and availability of room-temperature reactivity, these materials have a hydroxyl group at the end and a main chain consisting of polybutadiene, hydrogenated polybutadiene, and polybutadiene. -nitrile, polybutadiene-styrene,
It is desirable to use isoprene, polyether polyol, polyester polyol, urethane acrylic polyol, aniline derivative polyol, etc. alone or in combination. Further, as the curing agent for the above-mentioned reactive substance, an isocyanate-based curing agent is suitable, and it is necessary that each molecule has two or more isocyanate groups. Specific examples thereof include toluylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and prepolymers having terminal isocyanate groups, which can be used alone or in combination. In addition, isocyanate-based curing agents can be used in combination with plasticizers due to problems such as blending ratio and/or viscosity, but the plasticizer must be dehydrated and must not react with the isocyanate compound. It is.

[Table] Id

[Table] Although it is possible to obtain a crosslinked viscoelastic material that satisfies the present invention by combining only the essential components required to carry out the room-temperature reaction described above, it is possible to obtain a crosslinked viscoelastic material that satisfies the present invention. By adding additives, a wide range of stable crosslinked viscoelastic materials can be obtained. Examples of additives include plasticizers, fillers, bituminous substances, tackifying resins, antiaging agents, antifungal agents, flame retardants, catalysts, surfactants, coupling agents, and the like. The plasticizer is blended for the purpose of adjusting viscosity, adjusting workability, adjusting the substance of the crosslinked viscoelastic body, imparting flame retardance, and the like. Specific examples of plasticizers include naphthenic oil, paraffinic oil, amarotic oil, castor oil, cottonseed oil, pine oil, tall oil, phthalic acid derivatives, isophthalic acid derivatives, adipic acid derivatives, areic acid derivatives, and functional groups of liquid rubber. There are some that do not contain , and they can be used alone or in combination. When flame retardancy is required, halogen compound-based or phosphorus compound-based plasticizers can be used alone or in combination. Bituminous materials include straight asphalt, blown asphalt, and tar.
In order to obtain a desired crosslinked viscoelastic body, it may be used after being modified with a tackifying resin, a plasticizer, etc. in advance. Tackifier resins include natural resins, rosins, modified rosins, derivatives of rosins and modified rosins, polyterpene resins, modified terpenes, aliphatic hydrocarbon resins, cyclopentadiene resins, aromatic petroleum resins, phenolic resins, Alkylphenol - acetylene resin, xylene resin, coumaron -
Indene resin, vinyltoluene-α-methylstyrene copolymer, etc. can be used alone or in combination. Fillers are effective in improving vibration damping properties, sound insulation properties, and flame retardancy, and can be used to adjust the blending ratio of main ingredient/curing agent.
It is used for the purpose of adjusting viscosity and reducing compounding costs, and those commonly used in rubber and paints can be used. Specific examples include mica, graphite,
General-purpose fillings such as scale-like inorganic powders such as vermiculite, talc, and clay, high-density fillers such as ferrite, metal powder, barium sulfate, and lithopone, calcium carbonate, finely divided silica, carbon, magnesium carbonate, aluminum hydroxide, and asbestos. These agents can be used alone or in combination. Moreover, antimony trioxide, borax, etc. can also be used for the purpose of flame retardation. Other additives include anti-aging agents, catalysts, pigments, surfactants, coupling agents, antifungal agents, etc., and these can be added as necessary. Next, the air-filled film base material filled with the crosslinked viscoelastic material refers to a film base material having alternately air-filled convex portions and film-only recessed portions.
The figure shows a perspective view of an example of an embodiment filled with a crosslinked viscoelastic material. As the air-filled film base material, general-purpose products conventionally used as packaging materials are sufficient.
The ratio of the air volume of the hollow convex portion to the volume of the crosslinked viscoelastic material filled in the concave portions of the film alone is preferably a ratio of convex portions: concave portions = 2:8 to 8:2; concave portions: convex portions. When the number of convex portions is less than 2:8, the cost of raw materials increases and the restorability tends to deteriorate. On the other hand, if the number of convex portions increases from a ratio of convex portions to concave portions of 8:2, although the cost of raw materials decreases, there is a tendency that the risk of destruction of the air bag increases and the restorability tends to deteriorate. Further, the thickness of the film constituting the air enclosing portion is preferably about 20μ to 100μ. Further, the height of the convex portion is preferably 6 mm or less, and a more preferable range is 2 mm to 4 mm. Further, the volume of air per one convex portion is desirably 10 c.c. or less, and a more preferable range is 0.3 to 5 c.c. Further, the crosslinked viscoelastic material to be filled may be filled onto the convex portion, but in consideration of cost, it is better to have a thickness of 1 mm or less. On the other hand, if the filling height is less than 3/4 of the height of the convex part, it is not desirable because unless it is compressed from the beginning, the adhesion effect with the restraining material cannot be achieved and the adhesive strength is likely to be insufficient. . In addition, the materials that make up the film base material include polyethylene, polypropyne, nylon, polyester,
Films such as vinyl chloride and vinylidene chloride can be used, but polyethylene and polypropylene have the advantage of being easily available as general-purpose products, and vinylidene chloride is a preferred material because it has excellent gas permeation resistance. Further, the shape of the air-filled convex portion may be any shape such as a columnar shape, a prismatic shape, a semicircular shape, or an elliptical shape. In addition, in order for the flooring material having the floor structure of the present invention to exhibit its function as a wooden flooring material, the entire surrounding area may be provided with, for example, a narrow fruit part,
By adopting a method that takes into account the level of the flooring materials, it is aesthetically no different from ordinary wood flooring materials. Next, the present invention will be explained with reference to Examples and Comparative Examples. These are summarized in the table.

[Table] Test method (1) Prepare a base material according to the formulation examples shown in Examples and Comparative Examples, add and mix the specified curing agent, and apply it to a film base material having the indicated volume ratio of convex portions to concave portions. After filling and crosslinking, a crosslinked viscoelastic film was obtained. One side of the film obtained as above
Glued to 5.5mm thick wood composite flooring material,
Glue the remaining one side to 2.5mm thick plywood,
This was used as a common sample for comparative examples. Next, Example 1 is 2.5
A 10 mm to 4 mm thick 30 times expanded polyethylene mesh was bonded to one side of a mm thick plywood board with a mesh spacing of 20 mm x 20 mm as an uneven absorbing material. In Example 2, the bottom surface of the uneven absorbent material of Comparative Example 1 was further covered with 4 mm thick 30 mm expanded polyethylene with a mesh spacing of 20.
It is made by laminating mm x 20 mm. Comparative Example 1 uses the uneven absorbent material of Example 1 with a thickness of 2 mm.
It is made of double-foamed polyethylene and is made into a sheet-like material without a mesh. (2) Mix the main ingredient of the viscoelastic compound obtained in the same manner as in (1) above and a curing agent at a predetermined ratio, and form a 12 mm x 50 mm
It was poured into a formwork with dimensions of 50 mm and used as a sample for hardness measurement. After curing for 7 days at room temperature and 7 days at 50°C, hardness was measured using a C-type hardness meter specified in the Japan Rubber Association standard SRIS-0101. (3) 12mm x 50mm x 50mm obtained in the same way as hardness measurement
Apply release paper to the crosslinked viscoelastic material surface of the sample,
After applying a load of 500 g and allowing it to stand at 80°C for 24 hours, it was unloaded, left to stand at room temperature, and was visually judged based on the magnitude of deformation after 4 hours. Those with sharp edges and little deformation are marked with an ○, and those with no sharp edges or large deformations are marked with an x. (4) To measure floor impact sound, the sample prepared in (1) above was attached to a 150 mm thick RC slab, and light impact sound was measured using a tapping machine. The measurement method was in accordance with JIS-A-1418, as shown in FIG. The results were shown in terms of floor impact sound insulation grade. (5) The 4 mm thick cross-linked viscoelastic film base material obtained in (1) above was created, and it was laminated to 2.5 ^t plywood boards each on the top and bottom with dimensions of 4 mm x 50 mm x 50 mm, and tested using a compression tester. Compress 50% at a compression speed of 2 mm/min,
After holding for 30 minutes, the load was unloaded and the recovery property was checked after 10 minutes. ○ Those that showed recovery of 95% or more
95% or less is indicated by an x mark. (6) The relationship between the compressive stress and displacement of the air-filled film alone and the crosslinked viscoelastic film was compressed using a compression tester at a compression speed of 2 mm/min, and the displacement and compressive stress were determined from the obtained chart. The readings were graphed (see Figure 8). (7) The sample used in Example (1) had dimensions of 200 mm x 300 mm, and a point load of 1 cm ² was applied to the center, and the loads were 1 Kg/cm ² , 3 Kg/cm ² , and 5 Kg/cm ^{2 .} The amount of displacement of the floor over a long period of time was measured using a dial gauge and graphed (see Figure 9). From the above, in Example 1, a cross-linked viscoelastic film was bonded between a 5.5 mm thick wood composite flooring material and a 2.5 mm thick plywood, and the above boards were used as an upper restraining layer and a lower restraining layer, respectively, and a 4 mm thick A double-foamed polyethylene network is bonded to the remaining surface of the lower restraining layer as a non-contact absorbing material with vibration damping properties. In this case, the effect of the uneven absorbing material can be exerted, and the length is not such that a good floor impact sound mitigation effect is produced, and the compression properties also show good resilience. Example 2 shows the case where a net-like material of 4 mm thick 30 times expanded polyethylene was further bonded to the lower surface of Comparative Example 1. It can be seen that the effect of mitigating the floor impact sound of Example 1 is exhibited. Comparative Example 1 showed a case where the foam network was not used as the uneven absorbent material. Although the floor impact noise mitigation effect is excellent, there is still room for further improvement in order to obtain even higher effects. As shown in Examples 1 and 2, the floor structure shown in Comparative Example 1, in which the uneven absorbent material was replaced with a foam net, had a very large effect, and it was even more effective for residents on the lower floors. This is close to a level where you can live comfortably. The graph shown in Figure 8 compares the air-filled film base material alone and the film base material with a crosslinked viscoelastic body. This shows that it is necessary to add large compressive strength to provide displacement. In other words, it can be said that it has ideal compression characteristics as a floor material for mitigating floor impact noise. Figure 9 shows that the flooring material of the present invention is subjected to long-term loads.
This shows what kind of changes will occur. This is an attempt to change the load value by point load,
Judging from the materials used in ordinary housing complexes, it can be said that this flooring material has sufficient load-bearing capacity. As mentioned above, according to the present invention, the patent application No. 1983-
93466 (Japanese Unexamined Patent Publication No. 62-253866), by utilizing the compression characteristics of the enclosed air layer and the compression characteristics of the crosslinked viscoelastic body, and by increasing the adhesion surface area due to the complex shape. , the damping performance of the restraint-type damping material can be exhibited more efficiently. By replacing part of the crosslinked viscoelastic material of the raw material with an air layer in the convex portion of the film, it has become possible to reduce costs. By keeping the total thickness of the vibration damping floor members thin, it is possible to suppress the height of the building's eaves, which has a great effect on lowering construction costs. In addition, a blocking effect can be utilized by the air layer in the convex portion of the film. In addition, by using the uneven absorbing material with a vibration damping function using the foam mesh according to the present invention, it becomes possible to further reduce floor impact noise, which has been in high demand compared to the past. The present invention, which makes it possible to finish wood flooring at low cost, has great industrial utility value.

[Brief explanation of drawings]

FIG. 1 is a construction cross-sectional view of an embodiment of the present invention. FIG. 2 is a cross-sectional view of a product according to an embodiment of the present invention, in which the finishing material is an upper restraining material and the lower restraining material is an uneven absorbing material made of a foam net having a vibration damping function. . FIG. 3 is a construction sectional view of an example product of the present invention, and is an example in which two types of uneven absorbent materials, a foam net material and a foam sheet, are used in combination. FIG. 4 is a perspective view showing an example of the restraint-type damping floor member for direct attachment of the present invention, and FIGS. 5 and 6 are perspective views showing examples of the uneven absorption material with vibration damping function. Figure 7 is an explanatory diagram showing the equipment used to measure floor impact sound.
Furthermore, FIG. 8 is a diagram showing compression characteristics with and without a crosslinked viscoelastic body according to the present invention. FIG. 9 is a diagram showing the relationship between long-term point load and dent depth for an example product of the present invention. 1...Wood flooring board (upper restraint material), 2
... Film base material with crosslinked viscoelastic material, 3 ... Plywood (lower restraint material), 4 ... Foamed polyethylene network material,
5... Floor slab, 6... Real part, 7... Real part, 8... Polyethylene foam sheet, 9... Sound source room, 10...
Tapping machine, 11... Sample, 12... Floor slab, 13... Sound receiving room, 14... Microphone, 1
5... Precision sound level meter, 16... Frequency analyzer, 17
...Level recorder.

Claims (1)

[Scope of Claims] 1. A restraining type vibration damping floor member for direct attachment, including a concave portion and/or a convex portion of a film base material in which convex portions filled with air and concave portions made only of film are alternately arranged. An air-filled film base material with a cross-linked viscoelastic material filled with a cross-linked viscoelastic material is used as one member of the floor component on the entire surface of the recess, and a wooden flooring board is placed on the upper side as an upper restraining material, and a wooden flooring board is placed on the lower side. A restraint-type vibration damping floor member for direct attachment, characterized in that plywood is laminated as a side restraint material, and an uneven absorbing material made of a foam net-like material is further combined with the plywood. 2. The ratio of the volume of air in the convex portion containing air to the volume of the crosslinked viscoelastic material filled in the concave portion of the film alone is convex portion:concave portion = 2:8 to 8:2, and The cross-linked viscoelastic body, which is 6 mm or less in height and fills the entire surface of the recess including the recess and/or projection, is composed of a main component consisting of a telechelic polymer having a hydroxyl group at the end and an isocyanate group of 2 per molecule. 2. The restraint-type damping floor member for direct attachment according to claim 1, which is obtained by a curing reaction at room temperature with a curing agent having at least one of the following. 3. The crosslinked viscoelastic material that fills the entire surface of the recesses including the recesses and/or projections of the film base material, in which the convex portions containing air and the recessed portions containing only the film are arranged alternately, is made of hydroxyl-terminated liquid polybutadiene, Claim 1, characterized in that the product is obtained by subjecting a main ingredient consisting of asphalt and a plasticizer to a curing reaction at room temperature with a curing agent having two or more isocyanate groups per molecule. The described restraint type vibration damping floor member for direct attachment. 4 The crosslinked viscoelastic body undergoes a curing reaction at room temperature, and the product after the curing reaction retains its shape even when heated to 80°C, and has a hardness that meets the Japan Rubber Association standard SRIS-0101 at 20°C. 50 according to the C type hardness tester specified in
A constraint-type damping floor member for direct attachment according to claim 1, which satisfies the following three conditions. 5. The uneven absorbent material is made of a foam net-like material having a thickness of 1 mm to 10 mm, a foaming ratio of 10 times to 70 times, and a spatial surface formed by the mesh of 1 mm ² to 1000 mm ² . The vibration-damping flooring material described in item 1.