JPH11140153A - Room-Temperature Foaming Polyurethane Raw Material for Damping Material, Damping Material Obtained from It, and Method of Manufacturing Damping Structural Material - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a damping soft polyurethane foam,
Provided is a room-temperature-expandable polyurethane raw material for a vibration damping material, which does not require a heating foaming operation, and is therefore applicable to a finished product or an in-process product, and a vibration damping material obtained by using the same. A bifunctional polyol having a molecular weight of 3,000 to 30,000 is 55% by weight or more and a molecular weight of 3,000 to 30,000.
1-10% by weight of 15000 trifunctional polyol;
A cold foamable polyurethane raw material for a vibration damping material was constituted from an active hydrogen compound comprising 5-35% by weight of a monofunctional hydroxyl group or carboxyl group-containing compound having a molecular weight of 150-6000 and an organic polyisocyanate. The polyurethane raw material is injected into the hollow portion of the hollow structural member 10 and reacted and foamed at room temperature to obtain a vibration damping structural member filled with the soft polyurethane foam 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a room temperature foamable polyurethane raw material for a vibration damping material, a vibration damping material obtained by using the same, and a method of manufacturing a vibration damping structural material filled with such a vibration damping material. It is about.

[0002]

2. Description of the Related Art Conventionally, structural members for transportation equipment such as railway vehicles, ships, trucks, etc., which require vibration damping, sports equipment such as bats, and other members requiring vibration damping and sound insulation. As a material, a material in which a predetermined foam is filled in a hollow portion of a hollow structural material has been used. Then, in order to fill such a foam, use a foam material obtained by foaming in advance, cut it into a required cross-sectional shape, put it in a highly airtight film bag, and evacuate In order to improve the vibration damping property, it is performed to shrink the material, insert it into the hollow portion of the hollow structural material where the vibration damping property is required, and restore it, thereby filling the hollow structural material, etc. In order to improve the vibration damping property, it is necessary that the structural material and the foam are adhered after insertion and filling, and for that purpose, it has been attempted to melt the film bag in a heat treatment furnace. , It was costly.

Further, in order to fill the inner space of a short hollow structure such as a pillar of an automobile with a foam, a slab urethane foam having a slow recovery has been proposed as a filler. The foam is compressed by hand and inserted into the cavity of the hollow structure through the opening before its size is restored, and then the urethane foam is fully spread within the cavity, leaving no space Because it is intended to be filled,
The foam can be put into the void only from the opening,
Therefore, it is difficult to properly pack it in an effective position, and therefore, it may not be possible to seal a void in a target portion. Filling was extremely difficult and could not be employed.

Further, unlike the above-mentioned method using a foam which has been foamed in advance, a non-foamed damping material is used, and after applying it to a structural material requiring damping properties, heat treatment is performed. While foaming such unfoamed material at high magnification,
Although a method in which the foam (damping material) to be generated is stuck to the structural material is being studied, the structural material to which such an unfoamed vibration damping material is applied may be a finished product or an intermediate material. In the case of a process product, it is necessary to avoid performing heat treatment on the product quality, and it was not a method that could be adopted at all.

In Japanese Unexamined Patent Publication No. 1-29787, a foamed polyurethane resin is filled in a predetermined structural material according to the same post-foaming method as described above to impart vibration damping or sound absorbing properties. However, it has been revealed that, although the soft material of the foamed polyurethane resin is excellent in sound absorbing property, it has no vibration damping property, and that the hard material has both sound absorbing property and damping property. It is considered that the polyurethane foam cannot provide vibration damping properties. Thus, in order to exhibit excellent vibration damping properties, a vibration damping material is brought into close contact with the inner surface of the member requiring vibration damping properties,
With the vibration of such a member, it is necessary that such a vibration damping material is easily deformed. For that purpose, a soft vibration damping foam material is desirable.
The development of a soft polyurethane foam with vibration damping action
It is desired.

[0006]

Here, the present invention has been made in view of such circumstances, and it is an object of the present invention to provide a vibration-damping flexible polyurethane foam without the need for a heating foaming operation. Accordingly, it is an object of the present invention to provide a room-temperature-expandable polyurethane raw material for a vibration damping material that can be applied to finished products and intermediate process products, and to provide a vibration damping material having excellent vibration damping properties obtained using the same. Another object of the present invention is to provide a method for advantageously producing a vibration damping structural member filled with such a vibration damping material.

[0007]

According to the present invention, there is provided a vibration control device comprising a combination of an organic polyisocyanate and an active hydrogen compound, wherein the components react and foam at room temperature. The above-mentioned active hydrogen compound is used as a polyurethane raw material to give a flexible polyurethane foam having a molecular weight of not less than 55% by weight of a bifunctional polyol having a molecular weight of 3,000 to 30,000 and a molecular weight of 3,000 to 150.
Room temperature foaming for vibration damping material, comprising 1 to 10% by weight of a trifunctional polyol of No. 00 and 5 to 35% by weight of a monofunctional hydroxyl or carboxyl group-containing compound having a molecular weight of 150 to 6000. The purpose is to provide a mold polyurethane raw material.

In the room temperature foamable polyurethane raw material for a vibration damping material according to the present invention, as the active hydrogen compound reacted with the organic polyisocyanate, a predetermined 2
A monofunctional hydroxyl group or carboxyl group-containing compound is used in combination with the functional polyol and the trifunctional polyol, and further, since these three components are used in a predetermined mixing ratio, the reaction with the organic polyisocyanate is performed. The amount of the linear portion of the molecular chain in the polyurethane foam formed by the above is effectively controlled, and moreover, by the reaction of a predetermined amount of a predetermined monofunctional hydroxyl group or carboxyl group-containing compound that serves as a crosslinking terminator, The presence of a non-crosslinked branch in the molecule further increases the loss factor, thereby improving the damping properties. Further, such a polyurethane raw material is different from a conventional foamed rubber elastic body formed by heat foaming, and can be injected in a liquid state at a predetermined application point, and furthermore, it can be foamed at room temperature. The application work becomes extremely easy, and the range of application to members requiring vibration damping properties can be significantly expanded.

According to a preferred embodiment of the room-temperature-expandable polyurethane raw material for a vibration damping material according to the present invention, chlorinated paraffin is added in an amount of 50 parts by weight based on 100 parts by weight of the total amount of the organic polyisocyanate and the active hydrogen compound. ~ 25
At a ratio of 0 parts by weight, it is further contained, whereby the resulting flexible polyurethane foam is made flame-retardant and the vibration damping effect is further improved.

Further, the present invention relates to an organic polyisocyanate having a molecular weight of not less than 55% by weight of a bifunctional polyol having a molecular weight of 3,000 to 30,000 and a molecular weight of 3,000 to 15,
A polyurethane raw material obtained by combining an active hydrogen compound composed of 1 to 10% by weight of a trifunctional polyol having a molecular weight of 000 and 5 to 35% by weight of a monofunctional hydroxyl group or carboxyl group-containing compound having a molecular weight of 150 to 6000. Reaction and foaming at room temperature, especially 20
Under a state of compression deformation from 15 mm to 15 mm, a load of 10 gf / cm ² is further applied, and a time required for compression from 15 mm to 5 mm is 0.1 to 10 seconds. The gist of the damping material is as follows.

The soft polyurethane foam constituting such a vibration damping material according to the present invention, because of its excellent viscoelastic properties, easily deforms with the vibration of the member in the member to which it is applied, and It shows the damping performance.

In the vibration damping material according to the present invention as described above, in order to obtain an effective vibration damping effect, the flexible polyurethane foam preferably has a foaming ratio of 3 to 20 times. And an average bubble diameter of 0.05 to 5 mm.

Further, the present invention relates to an organic polyisocyanate having a molecular weight of at least 55% by weight of a bifunctional polyol having a molecular weight of 3,000 to 30,000,
A polyurethane raw material obtained by combining 1 to 10% by weight of a 5,000 trifunctional polyol and 5 to 35% by weight of a monofunctional hydroxyl or carboxyl group-containing compound having a molecular weight of 150 to 6000 is used. ,
After injecting into the hollow portion of the hollow structural material, the mixture is reacted and foamed at room temperature to further apply a load of 10 gf / cm ² in a state where the hollow portion of the hollow structural material is compressed and deformed from 20 mm to 15 mm. in addition,
The time required to compress from 15 mm to 5 mm is 0.
The gist of the present invention is also a method for producing a vibration damping structural material, which is characterized in that a flexible polyurethane foam having a characteristic of 1 to 10 seconds is produced and filled as a vibration damping material.

In the method for manufacturing a vibration damping structural material according to the present invention, the flexible polyurethane foam may have 3 to
Produced at a 20-fold expansion ratio and 0.0
It has an average cell diameter of 5 to 5 mm.

[0015]

DETAILED DESCRIPTION OF THE INVENTION In short, according to the present invention, in order to form a desired vibration-damping flexible polyurethane foam, three specific components are used as active hydrogen compounds to be combined with an organic polyisocyanate. That is, the use of a bifunctional polyol, a trifunctional polyol and a monofunctional hydroxyl group or a carboxyl group-containing compound has a great feature. In order to satisfy the sound insulation and the sound absorption, Since it is necessary to control the amount of the linear portion of the molecular chain of the polyurethane foam, the bifunctional polyol of the three components is 55% by weight based on the total amount of the three components. % Or less, and if the amount used is small, it is inevitable that other components such as a trifunctional polyol or a monofunctional hydroxyl group or carboxy Ratio of group-containing compound becomes large,
The vibration damping property is lost or the formation of the foam is hindered. Also, such bifunctional polyols
3000 to 30,000, preferably 8000 to 1500
It has a molecular weight of 0, and if the molecular weight is too small, the obtained polyurethane foam becomes hard, and there is a problem that a sufficient damping effect cannot be exerted, while the molecular weight becomes too large. This causes problems such as an increase in viscosity, making the filling operation difficult when applied to a structural material, and difficulty in forming a good foam structure.

The bifunctional polyol referred to here is:
A compound having two hydroxyl groups capable of reacting with an isocyanate group in one molecule and usually having two functional groups such as a dihydroxy compound such as ethylene glycol and diethylene glycol and an aromatic compound such as aniline and bisphenol A In addition, a polyether diol obtained by adding and polymerizing an alkylene oxide such as ethylene oxide or propylene oxide is used. Specifically, Sannicks PP-3000, PP-4000, PEG100 manufactured by Sanyo Chemical Industries, Ltd.
00, PEG13000, PTMG3000, Preminol 4010, 4019 manufactured by Asahi Glass Co., Ltd., CM-294, CM-381 manufactured by Asahi Denka Kogyo KK, and the like.

The trifunctional polyol is used for introducing a network structure into its molecular structure in a polyurethane foam, and performs effective crosslinking.
To form a foam, it is used in a proportion of at least 1% by weight or more based on the total amount of the three components. However, if the amount of use increases, the crosslink density increases and the damping performance decreases, so the upper limit is set to 10% by weight based on the total amount of the three components. Further, as such a trifunctional polyol, one having a molecular weight of 3,000 to 15,000 is used, and if the molecular weight is smaller than that, it is difficult to exert a sufficient vibration damping effect. On the other hand, when a trifunctional polyol having a molecular weight of more than 15,000 is used, it is difficult to form an effective foam and it is difficult to form a polyurethane foam having excellent target properties.

The trifunctional polyol has three hydroxyl groups capable of reacting with an isocyanate group in one molecule.
Usually, an alkylene oxide such as ethylene oxide or propylene oxide is added to an initiator having three functional groups such as glycerin or trihydroxy compound such as trimethylolpropane or an alkanolamine such as triethanolamine or diethanolamine. The polyether triol obtained by addition and polymerization will be used. Specifically, Sanyox GH-5000 and GP-3000 manufactured by Sanyo Chemical Industries, Ltd., MN-5000 manufactured by Mitsui Toatsu Chemicals, Inc., and Preminol 3012, 3010, 7012, 70 manufactured by Asahi Glass Co., Ltd.
09, 3005, etc., as appropriate.

In the present invention, another important factor relating to control of the molecular chain of the urethane foam is a compound having one of a hydroxyl group (hydroxyl group) or a carboxyl group which reacts with an isocyanate group.
This is the adjustment of the crosslink density by the functional compound. That is, in the case of ordinary urethane foam (elastomer), such a monofunctional compound is not used. However, as in the present invention, to realize a polyurethane foam exhibiting vibration damping properties, Since the monofunctional compound acts as a cross-linking terminator and has a non-cross-linked branch in the molecule,
The loss coefficient is further increased, and the vibration damping property can be further improved. And as such a monofunctional compound, the molecular weight is 150-6000, preferably 2
Those having a size of 00 to 3000 are used. Its molecular weight is 15
When the molecular weight is less than 0, there is a problem that the length of the non-cross-linked branch becomes short and the vibration damping property is reduced. On the other hand, when the molecular weight exceeds 6000, a problem occurs in the foaming property and the effective foaming is caused. It becomes difficult to get a body. In addition, since such a monofunctional compound inhibits the formation of a foam due to termination of cross-linking by the reaction, the amount of the monofunctional compound is limited to three components constituting the active hydrogen compound. It must be kept within the range of 5 to 35% by weight based on the total amount. If the used amount is less than 5% by weight, the vibration damping property is not sufficient, and if it exceeds 35% by weight, it becomes difficult to form the foam itself.

Incidentally, such a monofunctional compound includes 1
There are functional hydroxyl group-containing compounds and monofunctional carboxyl group-containing compounds. Among them, monofunctional hydroxyl group-containing compounds are usually long-chain alkylphenols such as nonylphenol, octylphenol and dodecylphenol, nonyl alcohol, lauryl alcohol, Use is made of addition polymers of higher alcohols such as stearyl alcohol with alkylene oxides such as ethylene oxide and propylene oxide, and hydroxyl group-containing petroleum resins. The latter monofunctional carboxyl group-containing compounds include palmitic acid and stearic acid. , Behenic acid, etc. having 9 carbon atoms
The above higher fatty acids will be used. All of these monofunctional compounds are appropriately selected from commercially available products. For example, Nonipol Soft FD-140, FD-80, Nonipol 70 manufactured by Sanyo Chemical Industries, Ltd.
0, D-160, Preminol 10 manufactured by Asahi Glass Co., Ltd.
02, 1006, SR-30 manufactured by Arakawa Chemical Industries, Ltd.
PX, SR-200, Y made by Yashara Chemical Co., Ltd.
P-90LL, Oxocol 14 manufactured by Kyowa Yuka Co., Ltd.
15, Arifat 47 manufactured by Henkel Hakusui Co., Ltd., and the like.

In the present invention, the organic polyisocyanate which forms a polyurethane resin by reacting with such an active hydrogen compound comprising three specific components has been conventionally used for the formation of polyurethane. In general, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and derivatives and modified products thereof are advantageously used, and for example, luplanate MS manufactured by BASF Japan. MM-103, Cosmonate T-80 and T-100 manufactured by Mitsui Toatsu Chemicals, Inc., Millionate MR-20 manufactured by Nippon Polyurethane Industry Co., Ltd.
0, MR-300, etc. will be used. The amount of the organic polyisocyanate used is such that the isocyanate group (NCO group) is 0.80 to 1 equivalent of the hydroxyl group (OH group) in the active hydrogen compound composed of the three components.
It is combined with the active hydrogen compound in such a ratio as to give 1.20 equivalents.

In order to form a polyurethane by reacting such an organic polyisocyanate with an active hydrogen compound, a suitable catalyst will be used in the same manner as in the prior art. It is desirable to use an organometallic system such as dibutyltin dilaurate, a tin system such as stannas octoate or a bismuth system such as bismuth neodecanoate or bismuth octylate and an amine system such as triethylenediamine in combination. Wherein the former is about 0.1 to 4.0 parts by weight based on 100 parts by weight of the polymer-forming component (the total amount of the organic polyisocyanate and the active hydrogen compound, the same applies hereinafter), and the latter is 100 parts by weight of the polymer-forming component Parts to about 0.1 to 5.0 parts by weight.

A foaming agent is also added to the polyurethane raw material composition in the same manner as in the prior art in order to foam the polyurethane produced by the reaction between the organic polyisocyanate and the active hydrogen compound according to the present invention and to form a predetermined foam. Although it will be hampered, such a blowing agent, generally,
Water is present in an amount of from 1 to 5 per 100 parts by weight of the polymer forming component.
As is well known, CO ₂ generated by the reaction between such water and isocyanate groups is used as a foaming gas to form a desired foam. In addition, a low boiling point solvent such as methylene chloride can be used in combination within a range of a compounding amount that does not cause volume shrinkage of the polyurethane foam that occurs at the time, specifically, a ratio of less than 10% by weight in the polyurethane raw material composition. is there.

Further, when the vibration-damping flexible polyurethane foam according to the present invention is applied to vibration-damping structural members of railway cars, various automobiles, etc., it is desirable to impart flame retardancy.
In this case, halogen-based flame retardants such as decabromodiphenyl oxide and chlorinated paraffin, phosphate-based flame retardants such as tricresyl phosphate and cresyl diphenyl phosphate, and antimony-based flame retardants such as Sb ₂ O ₃ The flame retardant is used alone or in combination. In addition, the compounding quantity is 50-250 weight part with respect to 100 weight part of polymer forming components. In particular, among such flame retardants, chlorinated paraffin imparts flame retardancy and also advantageously contributes to improvement of vibration damping properties.
It is suitably used.

In addition, various known compounding agents, for example, a foam stabilizer, a viscosity reducing agent, a plasticizer, a stabilizer, a filler, a coloring agent and the like can be appropriately compounded. Among them, dioctyl phthalate and dibutyl phthalate are used as plasticizers, and calcium carbonate, silica, mica and the like are used as fillers.

The above-mentioned components are divided into two-component systems (isocyanate component system and polyol component system: two liquids) in consideration of their properties and compatibility, and if necessary, three-component systems or more. The raw material compositions are prepared separately, and then, by mixing and stirring the raw material compositions at a predetermined ratio, at room temperature, a urethanization reaction is caused to generate polyurethane, and a predetermined foaming agent is used. The foamed structure is made to appear by the foaming action, and the intended polyurethane foam is formed. At this time, in order to obtain an effective vibration damping effect, the expansion ratio is 3
So that the average diameter of the bubbles is 0.05 to
The dispersion of the raw materials and the stirring of the components are adjusted so as to be 5 mm.

In this way, under the state of being compressed and deformed from a free thickness of 20 mm to a thickness of 15 mm, a load of 10 gf / cm ^{2 is} further applied, and 15 m
The time required to compress from m to 5 mm is 0.1 to 1
A flexible polyurethane foam having properties of 0 seconds,
Although it has been obtained advantageously, based on such excellent viscoelastic properties, such a flexible polyurethane foam exhibits extremely excellent vibration damping properties together with sound insulating properties and sound absorbing properties. Therefore, it is advantageously used as a conventional vibration damping material.

Further, according to the present invention, a polyurethane raw material composed of a combination of an organic polyisocyanate and an active hydrogen compound composed of predetermined three components can be formed as a liquid composition. After injecting into a hollow portion of a predetermined hollow structural material using a suitable liquid composition, by reacting and foaming at room temperature, a soft polyurethane having viscoelastic properties as described above is formed in the hollow portion of the hollow structural material. To generate foam,
By forming it into a form that is integrally filled as a vibration damping material, a vibration damping structural material can be advantageously manufactured, so that the range of application to members requiring vibration damping properties can be significantly expanded. That was it.

Incidentally, FIG. 1 shows a cross-sectional view of a hollow extruded member 10 which is one of the hollow structural members. There, the hollow extruded material 10 is opposed to and located at a predetermined distance from the upper and lower two face plates 12 and 14.
Are a plurality of intermediate plates 1 integrally formed between them.
6, a plurality of internal cavities 18 are formed between the face plates 12 and 14 and partitioned by an intermediate plate 16. The internal space 18 is generally formed continuously in the longitudinal direction of the hollow extruded mold member 10 (the direction perpendicular to the plane of the drawing in the figure).

Then, the hollow extruded die 1 having such a structure is used.
0, within at least one of its internal cavities 18
After the polyurethane raw material composition as described above is injected,
By foaming and reacting at normal temperature, the interior space 18 is filled (filled) with a soft polyurethane foam 20 as shown in FIG. 2 and is brought into close contact with the inner peripheral surface of the interior space 18. . Needless to say, such a flexible polyurethane foam 20 can be fixed to the inner peripheral surface of the internal space 18 of the hollow extruded mold member 10 using an appropriate adhesive. is there.

The hollow structural material to be filled with such a flexible polyurethane foam is not limited to those having a triangular hollow section as shown in the examples. Other various hollow structures are also applicable. For example, even a structure in which an inner space having a plurality of rectangular cross sections is formed by a plurality of intermediate plates between two face plates. The inside having a plurality of substantially rectangular cross sections or trapezoidal cross sections constituted by laminating a corrugated processing plate which is formed into a substantially corrugated shape by press molding or the like on a flat face plate without any problem. The present invention can be advantageously applied to a hollow structural material in which a void is formed, and a simple cylindrical or rectangular hollow member.

Further, in order to obtain a desired vibration damping material from the flexible polyurethane foam according to the present invention, such a vibration damping material may be constituted by such a flexible polyurethane foam alone or by using a restraining plate. It goes without saying that the vibration damping material can be formed in various known structures such as a structure in which a layer of a flexible polyurethane foam is formed on one surface thereof.

【Example】

Although the specific configuration of the present invention has been described in detail with reference to specific examples, the present invention is not to be construed as being limited by the specific description and the description of the following examples. The present invention is not limited to the above, and can be implemented in an embodiment in which various changes, modifications, improvements, and the like are made based on the knowledge of those skilled in the art, and such an embodiment does not depart from the spirit of the present invention. It goes without saying that all of them are included in the scope of the present invention.

First, as shown in FIG. 1, a plurality of hollow extrusion members 10 made of aluminum alloy: A6N01-T5 having a cross-sectional shape having seven internal cavities 18 and having a thickness of 80 mm and a length of 4 m. Was prepared, and various kinds of two-component room-temperature-expandable polyurethane raw material compositions comprising the first liquid and the second liquid shown in Table 1 below were prepared. As the first liquid, a bifunctional polyol having a molecular weight of 4000 (bifunctional PPG: Sannics PP-4000 manufactured by Sanyo Chemical Industry Co., Ltd.) and a trifunctional polyol having a molecular weight of 5000 (trifunctional PPG: Sanyo Chemical Industry Co., Ltd.) Sannics GH-5000 manufactured by Sanyo Chemical Co., Ltd., a monofunctional hydroxyl-containing compound having a molecular weight of 1000 (ethylene oxide adduct of nonylphenol: Nonipol D-16 manufactured by Sanyo Chemical Industries, Ltd.)
0), prepared using a silicone-based foam stabilizer, water, dibutyltin dilaurate, and TEDA-L33 (a 33% solution of triethylenediamine in dipropylene glycol) as a catalyst, and a second liquid comprising chlorinated paraffin and It was prepared using MDI (Lupranate MM-103 manufactured by BASF Japan) as an organic polyisocyanate.

Then, after the two-component room temperature foamable polyurethane raw material composition is uniformly mixed, immediately,
By injecting into each internal space 18 of the hollow extruded mold material 10 and causing it to react at room temperature and foaming,
Having various viscoelastic properties, average cell diameter of 0.05 to 5
A plurality of vibration damping structural members were obtained in which the interior voids 18 were filled with a flexible polyurethane foam having a diameter of mm (see FIG. 2).

The transfer function of each of the various vibration damping structural members obtained by filling the internal space 18 with the flexible polyurethane foam having the predetermined viscoelastic properties obtained by the above-described method is adjusted by a hammer vibration. The measurement was performed, and the loss coefficient was calculated from the obtained result based on the resonance method according to the following equation. Table 1 shows the results. Loss factor = half width / resonance frequency

The density and expansion ratio of each of these flexible polyurethane foams having various viscoelastic properties are determined, and the viscoelastic properties are determined as the required compression time (seconds) by using a polyurethane foam having a thickness of 20 mm. After compressing the body to 15 mm in advance, another 10 gf / cm
^The time required for compressive deformation from 15 mm to 5 mm under the load of ² was measured, and the results are shown in Table 1 below.

[0038]

[Table 1] (Note) The unit of the composition is parts by weight.

As is apparent from the results in Table 1, as in Examples 1 to 5 of the present invention, the vibration damping structure filled with the flexible polyurethane foam obtained by using the room temperature foamable polyurethane raw material composition according to the present invention. In the case of the material, the required compression time of the flexible polyurethane foam is in the range of 0.1 to 10 seconds, an extremely high loss coefficient is obtained, and it is recognized that the material exhibits an excellent vibration damping effect. Can be In contrast, as active hydrogen compounds, bifunctional polyols and 3
In Comparative Examples 1 and 2 in which a functional polyol was used and a polyurethane raw material composition without a monofunctional compound was used, the loss coefficient was low, and therefore, the vibration damping effect was not sufficient.

[0040]

As is apparent from the above description, the room-temperature foamable polyurethane raw material according to the present invention is a flexible polyurethane foam having excellent vibration damping properties,
Furthermore, a vibration damping material, and thus a vibration damping structural material, can be advantageously formed, and in addition to its excellent soundproofing properties, unlike conventional heat-foaming type vibration damping foam materials, can be foamed at room temperature. Since it is a material, it is not necessary to insert a foaming material in the state of the material into the material to be damped and heat and foam it.After assembling into a product, the polyurethane raw material composition as the foaming material is injected. It is possible to make it foam by this, after this, after assembling the product,
In the event that noise and vibration become a problem and countermeasures are required, such noise and vibration countermeasures can be advantageously taken using the room-temperature-expandable polyurethane raw material for vibration damping materials according to the present invention. It becomes.

Further, using the room-temperature-expandable polyurethane raw material for a vibration damping material according to the present invention, the vibration damping material obtained therefrom is as follows:
As it has both high vibration damping properties and sound absorption properties, and also has heat insulation properties, when applied to vibration damping members such as hollow structural materials, it has the same sound absorption and heat insulation properties as conventional urethane foam materials. Can also be expected.

Further, the room temperature foamable polyurethane raw material according to the present invention or the vibration damping material obtained therefrom has a great feature that it can be applied to members that could not be used with conventional heat foaming type vibration damping foaming materials. doing. For example, in a hard bat, a 7000 series aluminum alloy is used. In the case of such a 7000 series alloy, since the temperature at which the strength is reduced by heating is 120 ° C., the foaming temperature is 140 ° C. or higher. However, in the present invention, it is impossible to apply a conventional heat-foaming type vibration damping foam. However, in the present invention, since such a vibration damping foam can be foamed at normal temperature, such a vibration damping member (hard type) is used. Since the bat is not heated, it can be advantageously applied to such a member.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing an example of a hollow structural member to which the present invention is applied.

FIG. 2 is a cross-sectional explanatory view corresponding to FIG. 1, showing a state in which a hollow portion of the hollow structural material shown in FIG. 1 is filled with a vibration damping material according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Hollow extruded mold material 12 Face plate 14 Face plate 16 Intermediate plate 18 Internal space 20 Flexible polyurethane foam

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[Procedure amendment]

[Submission date] January 20, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

[0015]

DETAILED DESCRIPTION OF THE INVENTION In short, according to the present invention, in order to form a desired vibration-damping flexible polyurethane foam, three specific components are used as active hydrogen compounds to be combined with an organic polyisocyanate. That is, the use of a bifunctional polyol, a trifunctional polyol, and a monofunctional hydroxyl group or carboxyl group-containing compound has a great feature, in which the vibration damping property, the sound insulation property, and the sound absorption property are improved. In order to satisfy the above, it is necessary to control the amount of the linear portion of the molecular chain of the polyurethane foam. Therefore, the bifunctional polyol of the three components is added to the total amount of the three components. 55 for
% By weight or more, and if the amount used is reduced, the proportion of other components, such as a trifunctional polyol or a monofunctional hydroxyl group or a carboxyl group-containing compound, inevitably increases, and the vibration damping property is lost. Or inhibit the formation of foam. Also, such bifunctional polyols may range from 3,000 to 30,000, preferably from 8,000
It has a molecular weight of 15,000, and when the molecular weight is too small, the obtained polyurethane foam becomes hard, and there is a problem that a sufficient vibration damping effect cannot be exhibited.
If the molecular weight is too large, the viscosity will increase, and when applied to a structural material, there will be problems such as difficulty in filling and difficulty in forming a good foam structure.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C08J 9/02 CFF C08J 9/02 CFF F16F 1/36 F16F 1/36 C 15/02 15/02 Q (72) Inventor Ohashi Masahiko Nagoya 1-27-2 Shinei, Naka-ku Iida Sangyo Co., Ltd. (72) Inventor Nobuya Sato 1-127-2 Shinei, Naka-ku Nagoya-shi Iida Sangyo Co., Ltd.

Claims (7)

[Claims] An organic polyisocyanate and an active hydrogen compound are combined, and the components are reacted at room temperature.
The active hydrogen compound is used as a polyurethane raw material that gives a vibration-damping flexible polyurethane foam by foaming.
55% by weight or more of the bifunctional polyol having a molecular weight of 3
1 to 10% by weight of a trifunctional polyol having a molecular weight of 000 to 15000, and 5 to 35% by weight of a monofunctional hydroxyl group or carboxyl group-containing compound having a molecular weight of 150 to 6000. Room temperature foam type polyurethane raw material. 2. 50 to 25 parts by weight based on 100 parts by weight of the total amount of the organic polyisocyanate and the active hydrogen compound.
The room-temperature foamable polyurethane raw material for vibration damping materials according to claim 1, wherein chlorinated paraffin is further contained in a proportion of 0 parts by weight. 3. A bifunctional polyol having a molecular weight of 3,000 to 30,000 based on an organic polyisocyanate.
% By weight or more, 1 to 10% by weight of a trifunctional polyol having a molecular weight of 3000 to 15,000, and a molecular weight of 150 to 6
From a flexible polyurethane foam obtained by reacting and foaming a polyurethane raw material obtained by combining an active hydrogen compound composed of 5 to 35% by weight of a 000 monofunctional hydroxyl group or carboxyl group-containing compound at room temperature. Become a damping material. 4. The flexible polyurethane foam has a thickness of 20 m.
Under the condition of compression deformation from m to 15 mm,
Further, a load of 10 gf / cm ² was applied, and
The vibration damping material comprising a flexible polyurethane foam according to claim 3, which has a characteristic that a time required for compression to 0.1 mm is 0.1 to 10 seconds. 5. The flexible polyurethane foam according to claim 3, wherein
The damping material comprising a flexible polyurethane foam according to claim 3 or 4, having a foaming ratio of 0 times and having an average cell diameter of 0.05 to 5 mm. 6. A bifunctional polyol having a molecular weight of 3,000 to 30,000 based on an organic polyisocyanate.
% By weight or more, 1 to 10% by weight of a trifunctional polyol having a molecular weight of 3000 to 15,000, and a molecular weight of 150 to 6
After injecting into a hollow portion of a hollow structural material, a polyurethane raw material obtained by combining an active hydrogen compound composed of 5 to 35% by weight of a compound having a monofunctional hydroxyl group or a carboxyl group of 000, reaction and foaming are performed at room temperature. In this way, a 20 mm
Under a state of compression deformation from 15 mm to 15 mm, a load of 10 gf / cm ² is further applied to
A method for producing a vibration damping structural material, comprising: producing a flexible polyurethane foam having a property of requiring 0.1 to 10 seconds to be compressed to m, and filling as a vibration damping material. 7. The flexible polyurethane foam according to claim 3, wherein
Produced at 0 times expansion ratio and 0.05
The method for producing a vibration damping structural material according to claim 6, which has an average cell diameter of 5 to 5 mm.