JPH0655470B2 - Laminated sound insulation board - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sound insulation plate used for walls, floors, ceilings, doors, etc. of buildings, and more particularly to a lightweight, inexpensive, and sound insulation laminated sound insulation plate. Is.

[Prior art and its problems]

Noise has been increasing in recent years due to overcrowding of houses due to the development of transportation and the progress of urbanization, and prevention measures against it have become an important issue.

Causes of noise include traffic noise from automobiles, trains, aircraft, etc., as well as nearby facilities such as factories, schools, parks, and ball stadiums.
There are external noise generated from neighboring houses and internal noise generated in the same house, and music noises such as television, stereo, and piano are also serious problems in the residential area.

As a building board with a high sound insulation effect against these noises, it has been conventionally used for laminated sound insulation boards in which vinyl acetate resin, urea resin, water-based vinyl urethane resin, etc. are laminated as an adhesive layer on gypsum board, plywood, vinyl chloride resin, etc. There has been proposed a sound insulating sheet in which a heavy metal powder such as lead or iron is kneaded, or a composite sound insulating plate in which a sheet having a high sound insulating function such as a lead sheet is interposed.

However, such a conventionally known laminated sound insulation plate,
Alternatively, it has been pointed out that the composite sound insulation plate has the following problems. That is, (1) in the case of a laminated sound insulation plate, its production is easy, and it can be provided as an inexpensive building material, but the adhesive layer itself used for its construction contributes to the improvement of sound insulation. In addition, due to the rigidity of the board, the sound insulation performance (acoustic transmission loss) becomes considerably lower than the mass law in a frequency band higher than a certain frequency due to a kind of resonance phenomenon caused by bending waves and plane waves.

(2) In the case of a composite sound insulation board, satisfactory sound insulation performance can be obtained, but if a sheet with a high sound insulation function is used, it is heavy and expensive, and further, a composite sound insulation board is manufactured. In this case, not only the adhesive must be applied to the inner surface of the gypsum board, plywood, etc., but also to both sides of the sheet with a high sound insulation function. The obtained composite sound insulation plate is heavy in weight and expensive.

That is the drawback.

On the other hand, as a method of obtaining an ultra-soft elastomer composition with a urethane resin, a method of blending a high molecular weight polyether polyol with a chemical equivalent or less of an organic polyisocyanate and thermally curing them is known, and is also composed of these compositions. It is also known to use an elastomer composition for a shock absorbing material, a vibration isolating material, etc., but it has a sufficient adhesive force to be cured at room temperature and to be laminated with a construction board, and is super useful for sound insulation performance. No soft elastomer composition has been proposed to date.

[Problems to be Solved by the Invention]

The present inventors, in view of the above-mentioned problems, intend to address this, are easy to manufacture, and the obtained product is lightweight and inexpensive, as well as being a laminate having extremely high sound insulation performance. The purpose is to provide a sound insulation plate.

[Main points of the invention]

The present invention provides a prepolymer having an isocyanate group at an end, which is obtained from a high molecular weight polyol and an organic polyisocyanate, with a relatively low molecular weight caprolactone-based polyol between two or more plate-shaped materials to be laminated. The essential point of the invention is a laminated sound insulating plate obtained by integrating the plate-shaped materials with a room-temperature-curable ultrasoft elastomer composition blended as a crosslinking agent interposed as an adhesive layer.

[Means for solving problems]

Laminated sound insulation board according to the present invention, gypsum board, plywood, hardboard, in general commercially available building boards such as particle board, prepolymer having an isocyanate group at the terminal obtained from a high molecular weight polyol and an organic polyisocyanate, It is obtained by interposing a room temperature-curable ultrasoft elastomer composition containing a relatively low-molecular weight caprolactone-based polyol as a cross-linking agent as an adhesive layer and integrating them, and in this way, it is possible to reduce the sound transmission loss. While mitigating the coincidence effect, the frequency at which the coincidence effect occurs (the limit frequency) is shifted to the high frequency side, and as a result, it is easy to manufacture, is lightweight, is inexpensive, and is a composite with a conventional sound insulation function intervening. High sound insulation performance equivalent to or better than sound insulation plate In which it is possible to obtain a laminate sound insulation board.

The high molecular weight polyol used in the present invention is a polyol having an average molecular weight of 2000 to 8000 having 2 to 3 hydroxyl groups in one molecule, and examples thereof include polyhydric alcohols such as ethylene glycol, propylene glycol, glycerin, trimethylolpropane and hexanetriol. Ethylene oxide,
Polyether polyol obtained by adding one or more of propylene oxide, butylene oxide, etc., polyester polyol and caprolactone obtained by condensation of adipic acid, succinic acid, maleic acid, phthalic acid, etc. with ethylene glycol, propylene glycol, etc. It is also possible to use a polyester polyol obtained by ring-opening polymerization of, a polyester polyol such as castor oil and dehydrated castor oil, and a hydroxyl group-terminated polybutadiene polyol.

The organic polyisocyanate used in the present invention is a compound having two or more isocyanate groups in one molecule, and typical examples thereof include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and liquid modified diphenylmethane. Examples of the diisocyanate include, but are not limited to,
These may be used alone or in combination of two or more.

The prepolymer having an isocyanate group at the terminal used in the present invention is obtained by reacting the above-mentioned high molecular weight polyol and an organic polyisocyanate by a known method, and the isocyanate group at the terminal is 5 to 20% by weight, preferably 7 to 15% by weight. It is better to have

When the content of free isocyanate groups exceeds 20% by weight, the resulting elastomer composition becomes hard and is not preferable in terms of sound insulation performance. When the content of free isocyanate groups is less than 5% by weight, the prepolymer Viscosity increases, which causes trouble in handling.

Further, the crosslinking agent used in the present invention, ethylene glycol, propylene glycol, butylene glycol, glycerin, trimethylolpropane, polyhydric alcohols such as pentaerythritol or ethylene oxide, propylene oxide, butylene oxide,
A caprolactone-based polyester polyol which is a reaction product of a caprolactone and a polyether polyol having a hydroxyl group at a terminal obtained by addition-polymerizing one or more alkylene oxides such as tetrahydrofuran, and an average molecular weight of 300 to 1200, preferably 500 to 1000.

If the average molecular weight exceeds 1200, the reaction activity will be low at room temperature, which is not preferable as a crosslinking agent.

Further, if the average molecular weight is less than 300, the elastomer composition becomes hard, which is not preferable in terms of sound insulation performance.

When a polyoxyalkylene polyol having the same molecular weight and the same number of functional groups is used as a cross-linking agent, it cannot be cured at room temperature, and only a sufficient elastomer composition can be obtained by heat curing. Only when a caprolactone-based polyol is used, a super-soft elastomer composition that is useful for room temperature sound insulation performance can be obtained.

The mixing ratio of the above-mentioned cross-linking agent and the prepolymer having an isocyanate group at the terminal is not particularly limited, but usually, the molar ratio of the isocyanate group (NCO) of the pre-polymer to the hydroxyl group (OH) of the cross-linking agent, that is, NCO / OH is 0.8
~ 1.5, preferably 0.9-1.3.

If the molar ratio is outside the above range, the composition obtained is hard to cure, which is not preferable.

As the urethanization catalyst, those used in ordinary urethanization reactions, that is, tertiary amine compounds and organometallic compounds are used, and examples thereof include triethylenediamine, diaza-bicycloundecene, N-methylmorpholine, NN-dimethyl. Examples thereof include ethanolamine, tin octylate, tin laurate, and the like, and the amount to be used can be widely varied depending on the desired reaction rate.

Inorganic fillers can be used if necessary, and examples of these inorganic fillers include fumed silica, precipitated silica, silicic acid anhydride, reinforcing fillers such as carbon black, calcium carbonate, and carbonate. Examples include fillers such as magnesium, diatomaceous earth, clay, calcined clay, talc, titanium oxide, bentonite, organic bentonite, ferric oxide and shirasu balloon, and fibrous fillers such as glass fibers and filaments.

Further, in the present invention, a diluent can be used if necessary.

As the diluent to be used, usual diluents, for example, phthalic acid esters such as dioctyl phthalate and dibutyl phthalate, dioctyl adipate, isodecyl succinate, and aliphatic second basic esters such as dibutyl sebacate, diethyl are used. Examples thereof include fatty acid esters such as glycol benzoate and pentaerythritol ester, tricresyl phosphate, phosphate esters such as trioctyl phosphate, and chlorinated paraffin.

Further, as other additives, a defoaming agent, an ultraviolet absorber, an antioxidant, a pigment or the like can be used if necessary.

〔Example〕

Hereinafter, some embodiments of the present invention will be described with reference to the drawings and will also be compared with comparative examples.

The specifications of the laminated sound insulating plate samples shown in the following examples and comparative examples are as follows.

Area of sample 890 mm × 1800 mm Adhesive coating amount 400 g / m ² Pressing time 4 Hr Press gauge pressure 3 kg / cm ² Example 1 FIG. 1 shows the first example according to the present invention, The laminated sound insulation board indicated by A is 66.7 parts by weight of polyoxypropylenetriol having an average molecular weight of 5000 and 33.3 parts by weight of 4,4-diphenylmethane diisocyanate at 80 ° C. between two gypsum boards 1 and 1 having a thickness of 9 mm. 100 parts by weight of a prepolymer having a free isocyanate group content of 9.2% by weight and a viscosity of 3500 CPS (25 ° C.) obtained by reacting for 3 hours was mixed with 100 parts by weight of a caprolactone-based polyol having an average molecular weight of 800 and 0.01 part by weight of tin laurate. Adhesive 2 composed of a room temperature curable ultra soft elastomer composition according to the present invention
After being coated, the laminated gypsum boards 1 and 1 are pressure-bonded to obtain a product.

COMPARATIVE EXAMPLE 1 FIG. 2 is formed for comparison with the first embodiment. The laminated sound insulating plate generally indicated by B is a two-layer board having a plate thickness of 9 mm and having the same specifications as those of the first embodiment. 1 gypsum board,
An adhesive 3 made of water-based vinyl urethane (trade name; manufactured by KR-137 Koyo Sangyo Co., Ltd.) is applied between 1 ', and the laminated gypsum boards 1', 1'are then pressure-bonded to obtain a product. .

The sound insulation performance of each of the laminated sound insulation plate A of Example 1 and the laminated sound insulation plate B of Comparative Example 1 is shown in FIG. 7, and the sound insulation performance of the laminated sound insulation plate A of Example 1 is superior. The performance was shown.

This measurement result shows that the present invention remarkably contributes to the prevention of the reduction of sound transmission loss due to coincidence.

Embodiment 2 FIG. 3 shows a second embodiment according to the present invention. The laminated sound insulating plate generally indicated by A is composed of two lauan plywoods 11 and 11 having a plate thickness of 4 mm and a plate thickness of 5 mm. Between the hardboard 12 and the average molecular weight of 5000 polyoxypropylene triol
66.7 parts by weight of 4,4-diphenylmethane diisocyanate 33.3 parts by weight were reacted at 80 ° C. for 3 hours to obtain a free isocyanate group content of 9.2% by weight and a viscosity of 3500 CPS (2
(5 ° C) 100 parts by weight of prepolymer and 100 parts by weight of caprolactone-based polyol having an average molecular weight of 800 and tin laurate 0.0
The adhesive 2 made of the room temperature-curable ultra-soft elastomer composition according to the present invention containing 1 part by weight is applied, and then the laminated lauan plywood 11 and the hard boat 12 are pressure-bonded to each other to obtain a product. .

COMPARATIVE EXAMPLE 2 FIG. 4 is formed for comparison with the second embodiment. The laminated sound insulating plate generally indicated by B is a lauan plywood 11 and a hard disk having the same specifications as those of the second embodiment. Adhesive 3 made of water-based vinyl urethane between the board 12 (trade name: K
R-137 Koyo Sangyo Co., Ltd. was applied and then pressure-bonded to obtain a product.

The sound insulation performance of each of the laminated sound insulating plate A of Example 2 and the laminated sound insulating plate B of Comparative Example 2 is measured as shown in FIG. 8. The laminated sound insulating plate A of Example 2 which is an embodiment of the present invention. Showed better sound insulation performance.

This measurement result shows that, like the measurement result in the first embodiment, the present invention significantly contributes to the prevention of the reduction of the sound transmission loss due to the coincidence.

Example 3 FIG. 5 shows a third example according to the present invention, which is provided on both sides of a wooden frame 5 (20 mm × 40 mm) containing glass wool 4 (32 kg / m ³ , thickness 10 mm) inside. The laminated sound insulation boards A and A obtained in the second example were obtained by reacting 66.7 parts by weight of polyoxypropylenetriol having an average molecular weight of 5000 and 33,3 parts by weight of 4,4-diphenylmethane diisocyanate at 80 ° C. for 3 hours. Free isocyanate group content 9,2
% By weight, 100 parts by weight of a prepolymer having a viscosity of 3500 CPS (25 ° C.) and 100 parts of a caprolactone-based polyol having an average molecular weight of 800
A panel product was prepared by applying an adhesive 2 composed of a room-temperature-curable soft elastomer composition according to the present invention containing 0.01 part by weight of important parts and tin laurate and then pressure-bonding the same.

COMPARATIVE EXAMPLE 3 FIG. 6 is formed for comparison with the third example. Instead of the adhesive made of the room temperature curable super soft elastomer composition specified in the third example, an aqueous vinyl urethane is used. An adhesive 3 (commercial name: KR-137 Koyo Sangyo Co., Ltd.) consisting of is applied and then pressure-bonded to form a panel product.

The results of measuring the sound insulation performances of the panel of Example 3 and the panel of Comparative Example 3 are shown in FIG. 9, and the product according to the third example of the present invention is superior in sound insulation. The performance was shown.

Similar to the measurement result in the first embodiment, this measurement result shows that the present invention remarkably contributes to the prevention of the reduction of the sound transmission loss due to the coincidence, and the sound insulation performance is reduced due to the structural short circuit. It is considered that the present invention is also effective for (sound bridge).

〔The invention's effect〕

Since the laminated sound insulating plate of the present invention is configured as described above, it can have a remarkable effect particularly on the coincidence effect, and compared with the laminated sound insulating plate constituted by using the conventionally used adhesive. We were able to dramatically improve the sound insulation effect.

In particular, according to the present invention, the above-mentioned sound insulation effect can be surely obtained without being affected by the material of the plate material used as the laminated board, and the adhesive layer 2 (normal temperature curing type super soft material) used. The elastomer composition) can exert the two effects of the function as an adhesive and the function as a sound insulation layer extremely effectively. Further, since the above-mentioned room temperature curable ultra-soft elastomer composition has sufficient adhesive force to form a laminated sound insulation plate, it can be used as a building material without any problem.

Furthermore, since the adhesive 2 used in the present invention is a room temperature-curing type super-soft elastomer, it can be cured at room temperature and does not require a special device for curing the adhesive during the production process. It has many features such as simplification, manufacturing cost reduction, and weight reduction.

[Brief description of drawings]

1, 3, and 5 are vertical side views showing an embodiment of the present invention, FIG. 2 is a vertical side view showing a comparative example with respect to the embodiment of FIG. 1, and FIG. 6 is a vertical sectional side view showing a comparative example with respect to the embodiment, FIG. 6 is a vertical sectional side view showing the comparative example with respect to the embodiment of FIG. 5, and FIG. 7 shows sound insulation effects of the first embodiment and the first comparative example. FIG. 8 is a graph showing the sound insulation effect of the second embodiment and the second comparative example, and FIG. 9 is a graph showing the sound insulation effect of the third embodiment and the third comparative example. A: laminated sound insulation plate of the present invention, B: known laminated sound insulation plate,
1, 1 '... Gypsum board, 11 ... Lauan plywood, 12 ...
... Hard board, 2 ... Adhesive composed of room-temperature-curable super-soft elastomer composition, 3 ... Known adhesive

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-249845 (JP, A) JP-A-63-69850 (JP, A) JP-A-63-227614 (JP, A)

Claims (1)

[Claims] 1. A relatively low molecular weight caprolactone-based polyol is cross-linked to a prepolymer having an isocyanate group at the terminal, which is obtained from a high molecular weight polyol and an organic polyisocyanate, between two or more plate-shaped materials to be laminated. A laminated sound insulation board in which a plurality of plate-shaped materials are integrated with each other by interposing a room temperature-curable supersoft elastomer composition mixed as an agent as an adhesive.