JPH0448100B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a component of a vibration damping floor, and relates to a vibration damping floor member that has excellent vibration damping and soundproofing performance and has improved ability to block floor impact noise caused by an impact source. It is something. More specifically, although the level of construction technology has improved in recent years, the level of living performance required has become even higher, and there is a particularly strong tendency to seek quietness. The present invention is particularly aimed at blocking noise caused by floor impact noise. (Prior Art) Sources of floor impact noise are usually classified into heavy impact sources, typified by children running around and jumping, and light impact sources, typified by walking and falling knives. The latter lightweight impact source can be softened by changing the floor surface material to tatami or carpet, so that it has almost no impact on the floor below, but recently insects such as dust mites and mold There is a growing demand for wood floors that are easy to maintain cleanliness due to the disadvantages that they tend to cause such problems. (Problem to be solved by the invention) However, the biggest drawback of wood flooring is that it has poor performance in preventing vibrations caused by solid vibrations to the downstairs floor, and it is also less effective against light impact noise than wood floor finishes. The current situation is that we are unable to fully respond to requests. On the other hand, solid vibrations related to weight impact sources are in the low frequency range, and it has been technically very difficult to block vibrations in the low frequency range. That is, since sound insulation due to a weight impact source requires mitigation of vibrations in the low frequency range, a method is usually adopted in which the thickness of the concrete slab itself is increased.
However, increasing the thickness of the concrete slab itself strengthens its rigidity and is highly effective against weight impact sources.
On the other hand, the increased weight of the floor slabs will require the reinforcement of structures such as pillars and beams that support them, the space under the floors will be reduced, and the eaves height of mid-to-high-rise housing will increase, resulting in a significant increase in costs. Moreover, this method requires strengthening the structure, making it extremely difficult to apply to existing dwelling units. On the other hand, if the concrete slab itself is given high vibration damping performance without increasing the thickness of the concrete slab, and vibration energy loss is increased within the concrete slab, floor impact noise isolation performance should be improved. be. However, it must be effective in the low frequency range; the weight increase must be kept within a range that does not require strengthening the structure; and it must be applicable to not only new housing units but also existing housing units. Considering,
The technical conditions are extremely difficult. Conventional techniques include bonding plate-type damping materials to structural members, applying control paint, and using restraint-type vibration-damping steel plates with a viscoelastic substance sandwiched between the steel plates as structural members. It is being However, since the method and method is a non-constraint type, the damping effect will be small unless the thickness of the damping layer is made two to several times the thickness of the substrate, and if it is made sufficiently thick, it will only increase the cost. Therefore, it is almost impossible to add vibration damping functions to ordinary concrete slabs, which have a certain degree of rigidity and damping properties. On the other hand, methods using plastic or rubber-based viscoelastic substances, such as those found in Japanese Patent Publication No. 39-12451 and Japanese Patent Publication No. 49-34703, are known. Because it is a hot melt type that adheres to steel plates etc. by heat melting, it has a large heat capacity and is unsuitable for large or long products even in construction sites or factory production. In addition, as a conventional method, as described in JP-A-55-90735, a urethane elastomer is bonded to a rigid plate-like body at the same time by integral foaming, and a notch is formed in the part of the urethane elastomer material that is in contact with the bottom surface of the base. However, foams are susceptible to permanent compressive strain, and even if they have a high vibration-preventing effect at the beginning of manufacture, their function gradually deteriorates, and the drawback is that long-term vibration-preventing effects cannot be guaranteed. . For this purpose, a relatively hard urethane elastomer with a large number of hard segments is used, in which the number of hard segments is increased using a chain extender in the urethane elastomer manufacturing process, and a notch is provided on the bonding surface with the substrate. However, it has the disadvantage that it cannot prevent the anti-vibration effect of the foam from deteriorating over time. (Means for Solving the Problems) The present inventors have developed a method that improves vibration damping performance in the low frequency range by using a viscoelastic material made of liquid reactive rubber and its curing agent, and using a metal, wood, or inorganic board as a floor slab. Based on the knowledge that a restrained vibration damping floor consisting of bonded bodies can provide a floor structure that is extremely effective at damping vibrations in the low frequency range, we first proposed the invention of JP-A-61-206640. However, at the stage of further improvement, it was discovered that the viscoelastic material, which greatly contributes to vibration damping, should be sandwiched between substrates to (1) prevent the odor peculiar to the viscoelastic material; (2) It is possible to prevent damage to the viscoelastic material during transportation, etc.; (3) It is possible to omit the anti-stick film of the viscoelastic material, which saves resources by reducing man-hours at the construction site and eliminating waste. (4) In terms of cost, it was confirmed that the range of applications from low-cost floors to high-end floors could be expanded, leading to the present invention. The present invention has at least a hydroxyl-terminated liquid polymer and an isocyanate curing agent as essential components, which are mixed at a viscosity of 200,000 cps or less, and then heated at temperatures of 0°C to 100°C.
An elastomer obtained by a crosslinking reaction at a reaction temperature of 150°C, and a non-foamed viscoelastic material that does not flow when the crosslinking reaction product is left standing at a temperature of 150°C, is used as a wood board material, an inorganic board material, and a sheet. , film,
This restraint type vibration damping floor member is characterized in that it is formed by laminating selected fabrics in a sandwich pattern and integrally molding them. The viscoelastic substance used in the present invention contains a hydroxyl-terminated liquid polymer and an isocyanate curing agent as essential components, and contains appropriate amounts of a plasticizer, bituminous agent, filler, anti-aging agent, catalyst, pigment, and surfactant as additives. One or more of the following agents, insect repellents, fungicides, and coupling agents are blended and mixed at a temperature of 0°C to
It is characterized by being obtained by crosslinking reaction at 100°C. Further, the viscoelastic material of the present invention is characterized in that it has a thickness of 0.5 to 10.0 mm. Next, the structure and constituent materials will be described. FIG. 1 shows one embodiment in which the damping floor member of the present invention is applied to a floor slab. FIG. 2 shows one embodiment in which the damping floor member of the present invention is applied to a floor slab. 3 to 5 show embodiments of the damping floor member of the present invention. To describe the structure of the present invention in more detail, the constrained mold structure of the present invention is a laminate in which wood boards, inorganic boards, sheets, films, and cloth are laminated on the upper and lower surfaces of the viscoelastic material 4 and the viscoelastic material is used as an intermediate layer. It is a shaking bed member. Furthermore, the constituent materials will be explained including specific examples. Specific examples of wood planks include sawn products made of wood materials, precious woods, sawn boards, flooring, veneer flooring, laminated veneer lumber, plywood, and chips. Particle boards, wood chip cement boards, fiber boards made of fibers, pulp cement boards, and wood wool cement boards made of wood wool are listed, and all of these can be used regardless of the presence or absence of decorative finishing on the surface, the presence or absence of holes, and the thickness of the board. It can be used if it is plate-shaped. Specific examples of inorganic board materials include flexible boards,
Soft flexible board, large flat board, asbestos cement board represented by soft board, asbestos cement perlite board,
Examples include asbestos cement calcium silicate boards, plaster boards, etc., and any of these can be used regardless of whether or not the surface has decorative processing, whether or not there are holes, and whether the board is thick or not. In addition, sheet-like and film-like base materials include vulcanized rubber, non-vulcanized rubber, vinyl chloride polyethylene,
Examples include polypropylene, polyester, vinylidene chloride, ethylene-vinyl acetate copolymer, etc., but these may be foams, and the sheet thickness may be arbitrary. Further, specific examples of cloth-like base materials include nylon, polyethylene, polypropylene polyester, nonwoven fabric made of glass fiber, etc., cheesecloth; natural fibers such as cotton and linen, and/or nylon, urethane, polypropylene, acrylic, Examples include fabrics made of synthetic fibers such as polyester. Next, the viscoelastic substance will be explained. The viscoelastic material used in the present invention refers to a material that contains a hydroxyl-terminated liquid polymer and an isocyanate curing agent as essential components and does not flow when left at 150°C. More specifically, hydroxyl-terminated liquid polymers include liquid rubber polyols, polyether polyols, polyester polyols, and aniline derivatives whose main chain is polybutadiene, hydrogenated polybutadiene, polybutadiene-nitrile, polybutadiene-styrene, chloroprene, isoprene, etc. There are polyols and the like, and these can be used alone or in combination. In addition, as the isocyanate curing agent, toluylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate,
Examples include isophorone diisocyanate, prepolymers having terminal isocyanate groups, and block polymers thereof, which can be used alone or in combination. Isocyanate curing agents can be used in combination with plasticizers due to issues such as their blending ratio and viscosity, but the plasticizer must be dehydrated and must not react with the isocyanate compound. Although it is possible to obtain a viscoelastic substance that satisfies the present invention by combining only the essential components as described above, from the viewpoint of cost, workability, and physical properties, it is possible to obtain a viscoelastic substance with a wide range of stable viscoelastic properties by adding various additives. substance can be obtained. Examples of additives include plasticizers, fillers, bituminous materials, and tackifying resins. Plasticizers are blended for the purpose of adjusting viscosity and workability, controlling the physical properties of viscoelastic substances, and imparting flame retardancy. Specific examples of plasticizers include naphthenic oil,
Paraffin oil, aromatic oil,
There are castor oil, cottonseed oil, pine oil, tall oil, phthalic acid derivatives, isophthalic acid derivatives, adipic acid derivatives, maleic acid derivatives, and those that do not contain functional groups of liquid rubber, and they can be used alone or in combination. Furthermore, 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, tar, etc., and in order to obtain a desired viscoelastic body, they can be used after being modified with a tackifying resin, a plasticizer, etc. 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 are used to adjust the blending ratio of main ingredient/curing agent, adjust viscosity, and reduce blending costs. Those commonly used in relation to this 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. Agents can be used alone or in combination. Moreover, antimony trioxide, borax, etc. can also be used for the purpose of flame retardation. As other additives, various anti-aging agents, catalysts, pigments, surfactants, coupling agents, etc. can also be blended. The viscoelastic substance blended as described above undergoes a crosslinking reaction using an isocyanate curing agent, and the reaction molar ratio can be adjusted by adjusting the amount of the isocyanate curing agent to control the crosslinking density. As a result, a range of viscoelastic materials from very soft to hard viscoelastic materials can be obtained, but the reaction molar ratio suitable for the present invention is 0.5 to 1.5 mol Nco/oH. If it is less than 0.5 mol Nco/oH, the isocyanate curing agent is insufficient, and unreacted hydroxyl group-terminated polymer becomes excessive, causing flow phenomena at high temperatures.
The rubber elasticity is insufficient at low temperatures, resulting in disadvantages such as poor vibration absorption temperature characteristics and increased compression set. Furthermore, in terms of construction, there is an increased risk of curing failure. Conversely, 1.5 mol Nco/oH
In the case of the above reaction molar ratio, the isocyanate curing agent becomes excessive, which tends to impair rubber elasticity and damping properties in the service temperature range and low frequency range. In addition, in terms of construction, foaming is likely to occur due to the generation of carbon dioxide gas due to the reaction between the excess curing agent and a small amount of moisture, which is undesirable since there is a risk of adversely affecting the durability of the viscoelastic material. The calculation method is as follows. The required amount of curing agent for 100 parts by weight of hydroxyl-terminated liquid rubber (when the reaction molar ratio is 1.0 Nco/oH) is as follows. Required amount of curing agent = Weight of hydroxyl group-terminated liquid rubber (100) x Hydroxyl group content (wt%) / Curing agent isocyanate content (wt
%)×Nco/oH where Nco/oH=42/17=2.47 The hydroxyl group content indicates the weight percentage of hydroxyl groups in the hydroxyl group-terminated liquid polymer. Isocyanate content refers to the weight percentage of isocyanate groups in the curing agent. Next, regarding the crosslinking reaction conditions, the viscoelastic substance applied to the present invention is a substance obtained by mixing a main ingredient that is liquid at room temperature or when heated with a curing agent that is liquid at room temperature and performing a crosslinking reaction. Regarding the conditions for carrying out the crosslinking reaction, the factors of temperature and time greatly affect the speed of the crosslinking reaction, and the crosslinking curing time to reach non-fluid solidification becomes longer as the temperature becomes lower. The thickness of the viscoelastic material after the crosslinking reaction is preferably 0.5 to 10.0 mm. If it is less than 0.5 mm, the effect of blocking floor impact noise may be reduced.
It has the disadvantage that it is easily affected by unevenness of the substrate, and there are parts where the performance of the viscoelastic material cannot be fully demonstrated. On the other hand, if it is 10.0 mm or more, it is not preferable because it will increase the cost and there is a risk of distortion of the floor surface if the floor load is large. In addition, the crosslinking reaction of the viscoelastic material applied to the present invention can be carried out at temperatures ranging from low temperatures below 0°C to high temperatures above 100°C, but temperatures below 0°C are inappropriate because the crosslinking reaction time takes a long time. However, high temperatures of 100°C or higher are not suitable because the crosslinking reaction time is too short. Therefore, it is desirable to carry out the crosslinking reaction at 0°C to 100°C. In addition, it is desirable that the viscosity during application work be low, 20
10,000 cps is the limit for coating work. Generally, the viscosity is
Although it is supposed to decrease as the temperature rises, the crosslinking reaction temperature, that is, in the present invention, the temperature of 100° C. is the maximum, and the viscosity at that time is the lowest.

【table】

[Table] Table 1 shows the relationship between temperature and time of crosslinking reaction. In other words, at temperatures below 0°C, the crosslinking reaction time required for non-flowing solidification is extremely long, and a large storage space must be secured.Even if the viscoelastic material is applied to a constant thickness, it will flow. Since the time is long, there are disadvantages such as the thickness tends to vary. On the other hand, when the temperature is 100°C or higher, it is necessary to apply the coating in a very short time, making it unsuitable for constant production at a constant thickness. Next, the present invention will be explained with reference to Examples and Comparative Examples.

【table】

[Table] Example 1 shows an example in which the constrained vibration damping floor member of the present invention uses plywood for both the upper and lower layers of a viscoelastic material, and a carpet is arranged on the surface layer. The layered effect of the restraint-type damping floor member and the surface carpet is demonstrated. Example 2 shows a case in which a constrained vibration damping floor member of the present invention uses plywood as the upper layer of a viscoelastic material, uses a non-vulcanized rubber sheet as the lower layer, and has flooring arranged on the surface layer. Good effects have also been obtained on hard surface flooring materials. Comparative Example 1 is an example in which a constraining layer was provided only on the upper layer of the viscoelastic material, and no constraining layer was provided on the lower layer. Although the viscoelastic substance has an effect, it is not sufficient. Comparative Example 2 shows a case where the thickness of the viscoelastic material layer is 0.3 m/m among the structural conditions of the constrained vibration damping floor member of the present invention, which is outside the scope of the claims. Since the thickness of the viscoelastic material is thin, the effect of the viscoelastic material is not fully demonstrated. Comparative Example 3 shows an example of plywood alone. In this case, the effect of blocking floor impact noise is poor, and some kind of countermeasure is required. As mentioned above, by providing the constraining layers on the upper and lower layers of the viscoelastic material according to the present invention, vibration damping performance is improved, odor peculiar to the viscoelastic material is prevented, damage during transportation is prevented, and the viscoelastic material is The anti-adhesive film on the body can be omitted, reducing the number of man-hours for manufacturing the damping floor member and the construction process.Furthermore, since the anti-adhesive film is not discarded, it is effective from the viewpoint of resource conservation. In addition, in terms of cost, the method of attaching carpets, floor mats, etc. on the restraint-type damping floor member of the present invention has good damping properties, so it is possible to use low-cost damping floors, making it suitable for industrial use. It has great utility value.

[Brief explanation of the drawing]

1 and 2 show a construction sectional view of one embodiment of the present invention, and FIGS. 3, 4, and 5 show sectional views of each embodiment of the present invention, respectively. 1... Concrete floorboard, 2... Adhesive, 3... Plywood, 4... Viscoelastic material, 5... Carpet, 6... Non-vulcanized rubber sheet, 7... Flooring, 8... Flexible board, 9... Vinyl chloride film, 10... Non-woven fabric .

Claims (1)

[Scope of Claims] 1 At least a hydroxyl group-terminated liquid polymer and an isocyanate curing agent are essential components, and 200,000
An elastomer obtained by mixing at a viscosity of cps or less and crosslinking the mixture at a reaction temperature of 0°C to 100°C, and in which the crosslinking reaction product does not flow when left standing at a temperature of 150°C. Foamed viscoelastic material,
A restraining type vibration damping floor member characterized in that it is formed by laminating and integrally molding any one selected from wood board materials, inorganic board materials, sheets, films, and cloth in a sandwich shape. 2. The viscoelastic substance contains a hydroxyl group-terminated liquid polymer and an isocyanate curing agent as essential components, and contains appropriate amounts of a plasticizer, bituminous agent, filler, anti-aging agent,
Contains one or more of catalysts, pigments, surfactants, insect repellents, fungicides, and coupling agents,
2. The constrained vibration damping floor member according to claim 1, which is obtained by mixing and crosslinking at a temperature of 0°C to 100°C. 3. The constrained vibration damping floor member according to claim 1, characterized in that the viscoelastic material is formed with a thickness of 0.5 to 10.0 mm.