JPH0791488A - Tubular composite body and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve damping performance, to provide a tubular composite body the weight of which is reduced, to reduce a cost, to eliminate a fear of a damping layer being slipped out from the tubular body, and to facilitate formation of a damping layer. CONSTITUTION:A tubular composite body comprises a tubular body 1; and a damping material arranged in the inner space 5 of the tubular body 1. The damping material is a foam 3C formed by foaming and curing a liquid mixture at an ordinary temperature. Preferably, in a cross section paralleling the axis of the tubular body 1 or a cross section vertical thereto, the foam 3C is formed only at a part. By injecting the liquid mixture in the inner space 5 at an ordinary temperature and then foaming and curing the mixture, a damping material is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular composite which is suitable as a vibration damping member and a vibration damping structural material and has excellent vibration absorbing performance, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, noise problems have been highlighted for the purpose of improving product performance. The object extends beyond the living space to the working space, where vibration,
A technique for reducing noise is drawing attention. On the other hand, from the viewpoint of the problem of waste disposal, the technology for effectively utilizing industrial waste has been highlighted. Since noise is generated by the vibration of objects, use structural members with excellent vibration absorption performance,
Eliminating the resonance and resonance phenomenon of the structural members of the vibration system,
This is the most efficient noise reduction measure.

Conventionally, tubular bodies have been widely used for mechanical members, columns of structures, and shafts for power transmission. This is because the tubular body can obtain high rigidity in spite of its small weight, and thus the weight of the column and the shaft can be reduced. However, the above-mentioned columns and shafts resonate when the vibration of the machine etc. is received, and the vibration of the machine etc. is amplified,
It is easy to generate noise. Therefore, in order to prevent noise pollution and improve the working environment, noise countermeasures are required. However, in most cases, these struts and shafts are mechanically and firmly connected to a machine or the like. That is,
In many cases, it is mechanically impossible to connect a machine or the like to a column or a shaft through a vibration insulator.

Generally, as a principle of preventing vibration,
(1) Weight increase or rigidity enhancement, (2) Avoidance of resonance, (3)
There are only three principles: vibration damping. However, if the pillar or shaft is made tubular, the resonance frequency changes even if the tubular body is thickened and a solid rod is used instead of the tubular body to increase the weight of the pillar or shaft. Can be seen, but (3) vibration damping effect is not seen. Therefore, conventionally, (2) resonance has been avoided. That is, by attaching a heavy object to a specific place and locally increasing the weight, the resonance frequency of the tubular body is shifted to a point different from the frequency of the vibration source, thereby avoiding vibration amplification due to resonance. . But,
This method is effective only when the frequency band of the vibration source is narrow, and it is impossible to shift the resonance point outside the audible range. Therefore, it is not always possible to exert a practical soundproof effect.

On the other hand, (3) In the case of a steel plate, many means are known as means for imparting vibration energy to the structural member itself for the purpose of damping vibration. For example, Japanese Patent Publication No. 39-12451 and Japanese Patent Publication No. 45-34703 disclose damping steel plates in which a viscoelastic body having a high mechanical loss rate is sandwiched between two steel plates. When such a sandwich structure is applied to a tubular body, a damping tube having a viscoelastic substance sandwiched between an inner tubular body and an outer tubular body can be obtained. However, with such a damping pipe, unlike the case of a steel plate, high damping properties cannot be obtained.

Therefore, the inventors of the present invention have previously reported that the Japanese Patent Publication No. 63-9 is used.
In Japanese Patent Publication No. 978, it is disclosed that when a viscoelastic body is filled in the entire tubular body, a significant vibration damping effect is exhibited. Although this method has a sufficient vibration damping property, the weight is increased and it is unavoidable to increase the horsepower of a drive source such as a motor, and the increased weight makes it difficult to carry and move.

[0007]

In order to solve this problem, the inventor of the present invention discloses in Japanese Patent Application No. 4-11622 that a foam is first produced externally and then the foam is formed into a tubular body. A technique for inserting the foam into the inner space and fixing the foam inside the tubular body has been disclosed. According to such a tubular composite, since the weight of the foam is light and the vibration damping effect of the foam is high, it is possible to provide a lightweight tubular composite having a high vibration damping effect.

However, in this case, it has been found that there is a difficult problem in the step of inserting and fixing the foam in the tubular body. That is, if the outer diameter of the foam is smaller than the inner diameter of the tubular body, the foam will come off, so that the outer diameter of the foam is made larger than the inner diameter of the tubular body, and the foam is pushed into the tubular body, and the friction force is increased. It is necessary to fix the foam by. However, if the tubular body and the foam become long, the frictional force at the time of inserting the foam becomes enormous, the insertion becomes impossible, and the tubular composite cannot be manufactured.

In the above-mentioned Japanese Patent Application No. 4-11622, a solid material containing a foaming agent is inserted into the inner space of the tubular body, and then the tubular body is heated to cause a foaming reaction of the foaming agent. A technique for converting solids into foams has been disclosed. However, when the tubular body was heated and the foaming reaction proceeded, the material of the tubular body deteriorated. Further, this heat-foaming step requires a considerable amount of time, equipment, and energy, which increases the manufacturing cost of the tubular composite.

An object of the present invention is to provide a tubular composite having a high vibration damping performance and a low weight, and at a low cost, the vibration damping layer can be easily damped without the risk of the vibration damping layer coming out of the tubular body. The purpose is to be able to provide layers.

[0011]

The tubular composite of the present invention comprises:
The vibration damping material comprises a tubular body and a vibration damping material provided in the inner space of the tubular body, and the vibration damping material is a foam obtained by foaming and curing a liquid mixture at room temperature.

Further, the present invention is a method for producing a tubular composite body comprising a tubular body and a damping material provided in the inner space of the tubular body, wherein the compound which is liquid at room temperature is placed in the inner space. The present invention relates to a method for producing a tubular composite, which comprises forming a vibration damping material by pouring the mixture into a foam and then foaming and curing the composition.

[0013]

The present inventor has conducted various experiments on how to reduce the weight without impairing the damping performance of the damping member. In this process, pour the liquid mixture at room temperature into the inner space,
It was then found that when the damping material is formed by foaming and curing the formulation, a lightweight and highly damping tubular composite is obtained. Moreover, since it is not necessary to push the foam into the tubular body and heating is not required, the tubular composite can be manufactured very easily and at low cost.

The tubular composite of the present invention has the following modes. The entire interior space of the tubular body is filled with the formulation and allowed to foam to produce the tubular composite. When a layer of the compound is applied to the inner wall of the tubular body and then the compound layer is foamed and cured, a foam layer having a uniform thickness is formed over the entire inner wall of the tubular body. This tubular composite has a smaller amount of foam than the above-mentioned tubular composite and is therefore lighter in weight, and the vibration damping effect is not inferior.

In order to produce this tubular composite, the compound is put in the tubular body, the compound is foamed while rotating the tubular body, and the foam layer is molded (rotational molding). However, in this method, since the tubular body is rotated, centrifugal force is applied to the compound, and the compound layer is pressed to prevent foaming,
The expansion ratio is lower than expected. In addition, in the adhesion layer made of the compound, on the surface side close to the center of the tubular body, foaming progresses and the expansion ratio increases, and on the side closer to the inner wall of the tubular body (outer peripheral side of the adhesion layer), the adhesion layer collapses. Is large, the foaming is largely hindered, and the foaming ratio becomes low. As a result, the expansion ratio became non-uniform in the foam layer.

On the other hand, the present inventor has reversed the conventional idea, that the thickness of the foam layer attached to the inner wall of the tubular body is greatly reduced in part, and the foam layer is removed in part. Then I conducted a noise test. As a result, it was surprisingly obtained that the vibration damping performance was improved by making the thickness of the foam layer non-uniform and reducing the total weight of the foam layer.

Specifically, if the thickness of the foam layer attached to the inner wall of the tubular body is greatly reduced in part and the foam layer is completely removed in part, excellent vibration damping properties are exhibited. Can
It was discovered that the amount of sound generated at the time of impact was reduced, the attenuation speed was also increased, and the noise reduction effect was extremely high.

The foam layer having a non-uniform thickness cannot be produced by the above-mentioned rotational molding, but can be produced by the following methods. The reason why the tubular body is rotated is because it is a means for making the thickness of the foam layer uniform.

(1) The formulation is cast into the inner space to form an elongated adhesion layer, which is then foamed and cured to form a foam layer. (2) The mold is fixed in the inner space, the mixture is poured into the gap between the inner wall of the tubular body and the mold, the mixture is foamed and cured to form a foam, and then the mold is removed from the inner space. .

(3) A restraint material is inserted into the inner space, the mixture is poured into a gap between the inner wall of the tubular body and the restraint material, and the mixture is foamed and cured in the gap to form a foamed body. The restraint member and the tubular body are joined by a foam. In this case, the vibration of the tubular body is suppressed by the restraint material and is damped by the foam, so that the vibration damping effect is further enhanced.

The present invention can also provide a means for effectively utilizing industrial waste. In particular, the glass transition temperature and spring constant of the foam can be adjusted by mixing industrial wastes such as recycled rubber and many plastics such as Styrofoam. The glass transition temperature and spring constant of the foam control the damping performance of the damping member. Therefore,
By utilizing the characteristics of each of the industrial wastes described above, the glass transition temperature and spring constant of the foam can be adjusted according to the operating temperature of the vibration damping member to obtain the optimum vibration damping effect.

[0022]

EXAMPLES The cross-sectional shape of the tubular body as viewed in the direction perpendicular to the central axis can be variously changed, such as a triangle, a quadrangle, a rhombus, and a hexagon. The tubular body is for ensuring the rigidity of the vibration damping member. The material of the tubular body may be an inorganic material such as metal, ceramics, glass, plastic, wood material,
It may be an organic substance such as paper, or may be a composite of the above materials. Examples of metals include steel, aluminum, copper, lead,
These alloys and the like are available. Ceramics, pottery,
There are porcelain, plaster, cement, etc.

Examples of plastics include vinyl chloride, acrylic, methacrylic, phenol, polypropylene and polyethylene. The wood material may be a tubular material having a hollow at the center. As the paper, there are a so-called paper tube and a paper tube which is impregnated with a resin or the like to give rigidity. The outer peripheral surface and / or the inner peripheral surface of these tubular bodies may be coated or plated to impart aesthetics and durability.

The conditions required for the foam are that it has a high vibration damping effect, does not deteriorate for a long period of time, adheres to the inner wall of the tubular body, does not flow below 80 ° C., and is as light as possible. However, unlike a commonly used viscoelastic body, various types of durability such as followability to a large amount of expansion and contraction displacement, oxidation deterioration resistance, and weather resistance are unnecessary.

The main polymer of the liquid composition at room temperature is polybutadiene, chloroprene, isoprene, styrene butadiene, acrylonitrile butadiene, aromatic short chain diol, etc., and the main chain skeleton has 2 or more end reactive groups per molecule. Those having; those having a double bond in the main chain skeleton as a cross-linking point; these combined systems; those having rich rubber elasticity such as polysulfide, urethane, silicon, modified silicon; epoxy resin, phenol resin, unsaturated polyester resin , Urea resin, melamine resin, acrylic resin,
A resin having high rigidity such as furan resin can be exemplified.

When the composition is a one-part composition which cures by moisture in the air, unlike the two-part composition, there is no need to mix the two parts and the pot life is short. Does not restrict work. The combination of the base compound and the reactive group of the curing agent for obtaining the liquid reaction-curable formulation is shown in Table 1.

[0027]

[Table 1]

Regardless of whether the main polymer is rich in rubber elasticity or has high rigidity, it is necessary to adjust the reaction molar ratio between the main agent and the curing agent, and to mix other polymers, bituminous substances, plasticizers, etc. Thereby, a foam having a high vibration damping property can be obtained.

When the operating temperature range of the tubular composite is near room temperature, in order to bring the glass transition point of the foam close to room temperature, bituminous materials, tackifying resins and other resins, and industrial waste thereof are used in combination. It is desirable to do. In this case, in general,
If a resin with good compatibility is used, the maximum value of the vibration damping property can be taken in a wide temperature range. However, even if a resin with poor compatibility is mixed, although the maximum value is divided into multiple parts, the peak value of the vibration damping performance can be reduced to some extent by devising the composition in order to bring the temperature ranges having the maximum value closer to each other. Even if it cannot be sacrificed, it can be a foam that can cover a wider temperature range.

The plasticizer is a substance that plays a role of a lubricant between polymers, assists fluidity between molecules, and reduces intermolecular internal friction to provide plasticity.

Specific examples of the plasticizer include petroleum softeners composed of naphthenic oils, aromatic oils and paraffinic oils; animal and vegetable oils such as castor oil, soybean oil and pine tar; phthalates composed of DBP, DOP and the like. Acid ester type; DOA,
Aliphatic dibasic acid ester system consisting of DBS; TOTM, TDTM
Etc. trimellitic acid ester type; epoxidized fatty acid monoester, epoxidized linseed oil etc. epoxy type; TCP, TOP etc. phosphoric acid ester type; diptyl carbitol adipate, triethylene glycol di-2-ethyl There are plasticizers such as ethers made of butyrate; polyesters made of adipic acid polyester, azelaic acid polyester and the like; chlorine type made of chlorinated fatty acid ester, chlorinated paraffin, and the like. Further, liquid rubber containing no polybutene or a terminal reactive group can be used as a plasticizer. The plasticizers can be used alone or in combination.

The filler is effective in improving vibration damping properties, specific gravity, weight reduction, thermal conductivity and flame retardancy, and those generally used in the rubber and paint related industries can be used. Specific examples thereof include scale-like inorganic powders such as mica, graphite, hirucite, talc and clay; high specific gravity and heat conductive fillers such as ferrite, zinc oxide, iron oxide, metal powder, barium sulfate and lithopone; carbonic acid. General-purpose fillers such as calcium, finely divided silica, carbon and magnesium carbonate; flame retardant improving fillers such as antimony trioxide, borax and aluminum hydroxide;
There are lightweight fillers such as glass hollow powder, perlite, resin foam powder, rubber foam powder, resin powder, rubber powder, fiber powder and paper powder.

The tackifying resin has the effect of adhering to the inner wall of the tubular body and improving the vibration damping property. Specific examples thereof include natural resins, rosins, modified rosins, derivatives of rosins and modified rosins, polyterpene resins, terpene modified products, aliphatic hydrocarbon resins, cyclopentadiene resins, aromatic petroleum resins: phenol resins, Alkylphenol-acetylene resin, xylene resin, coumarone-
There are indene resin, vinyltoluene-α-methylstyrene copolymer and the like, which can be used alone or in combination.

The bitumen has the effect of adhering to the inner wall of the tubular body and improving the vibration damping property. As a concrete example,
Straight asphalt, blown asphalt, tar, pitch. Other compounding agents include rust preventives, anti-aging agents, vulcanizing agents, catalysts, surfactants and the like, which can be added if necessary.

A blowing agent must be added to the formulation. Although there are many methods of forming a viscoelastic foam, they are roughly classified into the following foaming methods. (1) The gas generated by the chemical reaction is used. (2) Evaporate the low boiling point solvent.
(3) Air kneading method. (4) Method for removing solvent in polymer.
(5) Other.

In order to obtain a foam, optimum conditions must be set from the relationship between the curing rate of the polymer and the foaming rate. As the low boiling point solvent (2) that can be used as a foaming agent, methylene chloride, trichloromonofluoromethane, dichlorodifluoromethane, propane, butane, pentane, hexane, heptane, cyclohexane and the like can be used. The low boiling point solvents can be used alone or in combination. Further, a low boiling point solvent can be used in combination with the following foaming agent. The amount of low boiling point solvent used should be kept as low as possible in order to create a working environment.

(4) Examples of the foaming agent that can be used in the solvent removal method include N-methylformamide and dimethyl sulfoxide. The foaming agent specific to each polymer is shown. For unsaturated polyester, sodium bicarbonate, percarbonate,
Examples thereof include perborate salts, hydrazide compounds, and azodicarboxylic acids, which can be used alone or in combination.

By adding a catalyst to the composition, the state of formation of the core and the surface layer of the foam and the physical properties of the foam can be controlled. Specific examples of the catalyst will be shown.

Tertiary amines have a nucleophilic catalytic action on the resonance structure of the isocyanate compound. This includes triethylenediamine, triethylenediamine glycol solution, N, N, N ', N', N'-pentamethyldipropylenetriamine, N, N, N ', N', N'-pentamethyldiethylenetriamine, N, N, N ', N'-tetramethylhexamethylenediamine, N, N, N', N'-tetramethylpropylenediamine, bis (dimethylaminoethyl) ether, 2- (N, N-dimethylamino) ethyl-3 ─
(N, N-dimethylamino) propyl ether, N,
N'-dimethylcyclohexylamine, N, N-dicyclohexylmethylamine, methylenebis (dimethylcyclohexyl) amine, triethylamine, N, N-dimethylcetylamine, N, N-dimethyldodecylamine,
N, N-dimethylhexadecylamine, N, N, N ', N "-tetramethyl-1,3-butanediamine, N, N-dimethylbenzylamine, morpholine, N-methylmorpholine, N-ethylmorpholine, N- (2-dimethylaminoethyl) morpholine, 4,4'-oxydiethylenedimorpholine, N, N'-diethylpiperazine, N, N'-
Dimethylpiperazine, N-methyl-N'-dimethylaminoethylpiperazine, 2,4,6-tri (dimethylaminomethyl) phenol, tetramethylguanidine, 3-
Dimethylamino-N, N-dimethylpropionamide,
N, N, N ', N'-tetra (3-dimethylaminopropyl) methanediamine, N, N-dimethylaminoethanol, ethoxylated hydroxylamine, N, N, N', N'-tetramethyl-1,3 -Diamino-2-propanol, N, N, N'-trimethylaminoethylethanolamine, 1,4-bis (2-hydroxypropyl) 2-methylpiperazine, 1
-(2-hydroxypropyl) 2-methylpiperazine,
1- (2-hydroxypropyl) imidazole, 3,3
Examples thereof include diamino-N-methyldipropylamine, 1,8-diazobicyclo (5,4,0) -undecene-7 and N-methyl-N-hydroxyethylpiperazine.

Organometallic compounds have a function of electrophilic catalysis of the resonance structure of isocyanate compounds. This includes stanas octoate, stanas oleate, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin thiocarboxylate, dibutyltin dialeate, dimethyltin dilaurate, dioctyltin thiocarboxylate, potato acetate, sodium Examples thereof include bicarbonate, calcium carbonate, lead octoate, and the like.

The above-mentioned tertiary amines can be used alone or in combination of two or more kinds. The organometallic compounds can be used alone or in combination of two or more. The tertiary amine and the organometallic compound can be used in combination.

Next, the restraint material will be described. As the form of the restraint material, a film, a sheet or the like can be used. As the material of the restraint material, metal, ceramics, paper, wood material, rubber, plastic, fiber or the like can be used. A formulation layer can be formed on the restraint material, the restraint material inserted into the inner space of the tubular body, and the formulation foamed and cured to form a foam.
When the thickness of the foam is equal to or greater than the thickness of the tubular body, the vibration damping effect becomes large.

Embodiments of the present invention will be described below with reference to the drawings. 1 (A) and 1 (B) are cross-sectional views of the tubular composite taken along a line perpendicular to the axis. In this example, the tubular body 1 has a cylindrical shape. Both ends of the tubular body 1 are open. In the example of FIG. 1 (A), the foam 3A is filled in the inner space 5 of the tubular body 1, and the foam 3A is joined to the inner wall 1a.

In the example of FIG. 1B, the foam 3B is filled in the inner space 5 of the tubular body 1, and the foam 3B is joined to the inner wall 1a. A cavity 4A is formed in a part of the foam 3B, and the cavity 4A has a substantially circular shape. The foam 3B is not in contact with the inner wall 1a in the cavity 4A.

FIG. 2 (a) is a sectional view of the tubular composite taken along a direction parallel to the axis, and FIG. 2 (b) is a sectional view of the tubular composite taken along a direction perpendicular to the axis. FIG. The foam 3C is joined to the inner wall 1a, and the restraint material 2 is housed in the cavity 4B of the foam 3C.
And are joined. The cross-sectional shape of the restraint member 2 is substantially square, and the cavity 2 a is provided inside the restraint member 2.

Both the restraint member 2 and the foam 3C extend between the end portions 1b and 1c. The restraint member 2 is fixed to an external member. When manufacturing such a tubular composite, the compound is filled between the restraint member 2 and the inner wall 1a, and the compound is foamed and cured.

FIG. 3 (a) is a sectional view of the tubular composite taken in a direction parallel to the axis, and FIG. 3 (b) is a sectional view of the tubular composite taken in a direction perpendicular to the axis. FIG. A string-shaped foam layer 3D is formed on the inner wall 1a of the tubular body 1. The foam layer 3D extends between the ends 1b and 1c. The foam layer 3D is provided only in part in a cross section perpendicular to the axis of the tubular body 1.

To form this foam 3D, the compound is poured into the inner space 5 little by little to form a string-like compound layer. The formulation layer is then foamed and cured.

FIG. 4 (a) is a sectional view of the tubular composite taken along a direction parallel to the axis, and FIG. 4 (b) is a sectional view of the tubular composite taken along a direction perpendicular to the axis. FIG. The foam layer 3E is joined to the inner wall 1a, and the foam layer 3E
And the restraint material 12 are joined. The restraint member 12 includes a raised portion 12a and a pair of flat portions 12b on both sides of the raised portion 12a.

A foam layer 3E is provided below the raised portion 12a, and the flat portion 12b is in contact with the inner wall 1a. The restraint member 12 and the foam 3E are both end portions 1b.
Between 1 and 1c. The restraint member 12 is fixed to an external member.

FIG. 5 (a) is a sectional view of the tubular composite taken in a direction parallel to the axis, and FIG. 5 (b) is a sectional view of the tubular composite taken in a direction perpendicular to the axis. FIG. On the inner wall 1a of the tubular body 1, the string-shaped foam layer 3F is provided with the end portion 1b.
And around the end 1c. In these portions, the foam layer 3F is provided over the entire circumference of the inner wall 1a in a cross section perpendicular to the axis of the tubular body 1, but its thickness is not uniform and unevenness is observed.

In the example shown in FIGS. 6 (a) and 6 (b), a string-shaped foam layer 3G is formed on the inner wall 1a of the tubular body 1. In particular, the foam layer 3G is fixed to the inner wall so as to have a spiral shape with the axis of the tubular body 1 as the main axis.

In the example shown in FIGS. 7A and 7B, two thick cord-shaped foam layers 3H are provided. Each foam layer 3H extends from the end portion 1b or 1c toward the central portion of the tubular body 1, but at this central portion, the foam layers 3H are not in contact with each other.

Further, as shown in FIG. 8 (a), the cord-shaped foam layer 3I can be fixed to four locations on the inner wall 1a. In the example of FIG. 8A, in particular, the foam layers 3I are arranged so as to form an angle of about 90 ° with each other. Further, as shown in FIG. 8B, a large number of string-shaped viscoelastic body layers 3J can be randomly arranged on the inner wall 1a.

Hereinafter, more specific experimental results will be described. First, the following formulations A to C were prepared.

[0056]

[Table 2] (Compound A: high rigidity type) Short chain diol (Mitsubishi Chemical Dow "Isonol 100") 100 parts by weight Straight asphalt 100 parts by weight Plasticizer (Idemitsu Kosan "Diana Process Oil AH-16") 100 parts by weight Foam stabilizer ("TSA-750" manufactured by Toshiba Silicon) 0.5 parts by weight Catalyst ("DABCO-33LV" manufactured by Sankyo Air Products Co., Ltd.) 1 part by weight Water 5 parts by weight Total main ingredient 306.5 parts by weight Curing agent ("Millionate MR200" manufactured by Nippon Polyurethane Industry Co., Ltd.) 370 parts by weight Total 676.5 parts by weight

[0057]

[Table 3] (Compound B: High rubber elasticity type) Hydroxylated terminal polybutadiene ("Poly BD R-45HT" manufactured by Idemitsu Petrochemical Co., Ltd.) 100 parts by weight Straight asphalt 60/80 200 parts by weight Plasticizer (Idemitsu Kosan Co., Ltd. "Diana Process Oil AH-16") 100 parts by weight Foam stabilizer ("TSA-750" manufactured by Toshiba Silicon) 0.5 parts by weight Dibutyltin dilaurate catalyst (manufactured by Nitto Kasei) 0.1 parts by weight Catalyst (Sankyo Air) Products "DABCO-33LV") 1 part by weight Water 3 parts by weight Total main agent 404.6 parts by weight Curing agent ("Millionate MR200" by Nippon Polyurethane Industry Co., Ltd.) 86 parts by weight Total 490.6 parts by weight

[0058]

[Table 4] (Combination C: Room temperature reaction-curable viscoelastic body) Epoxy resin ("AER331" manufactured by Asahi Kasei Corporation) 90 parts by weight Epoxy resin ("DER732" manufactured by Dow Chemical Co., Ltd.) 10 parts by weight Rubber foam pulverized Product 50 parts by weight Fine silica 20 parts by weight Paranonylphenol 1 part by weight Total of main agent 171 parts by weight Polyamine (“SANMIDE M-1001” manufactured by Sanwa Chemical Co., Ltd.) 100 parts by weight Clay 50 parts by weight DOP 20 parts by weight Total curing agent 170 Parts by weight Total of main agent and curing agent 341 parts by weight

Then, the following tubular composites were produced.
The tubular body 1 has an outer diameter of 48.6 cm, an inner diameter of 44 cm,
A steel pipe having a length of 1000 mm and a thickness of 2.3 mm was used.
Then, each of the above-mentioned formulations A to C was used to form a foam.

Example 1 The tubular composite shown in FIG. 1 (A) was manufactured. The formulation B was filled in the inner space 5 and allowed to react at room temperature. Example 2 A tubular composite body shown in FIG. 2 was manufactured. A restraint member 2 made of vinyl chloride resin was inserted in the center of the tubular body 1.
The size of the restraint member 2 is 20 mm × 20 mm × 10 on the outside.
00 mm, the inside is 19 mm x 19 mm x 100
It is 0 mm. The maximum thickness of the foam layer is 12 mm.

Example 3 A tubular composite body shown in FIG. 5 was produced. The foam layer 3F has a length of about 100 mm and a maximum thickness of about 10 mm. (Example 4) A tubular composite body similar to that in Example 3 was produced.
However, the foam layer was provided only on one end 1b side.

(Examples 5 and 6) The tubular composites shown in FIG. 3 were produced. The maximum thickness of the foam layer 3D was 3 mm.

Example 7 A tubular composite body shown in FIG. 4 was produced. The restraint material 12 was formed of corrugated paper. Example 8 A tubular composite body shown in FIG. 7 was manufactured. Each foam layer 3H has a length of about 400 mm and a maximum thickness of about 1
It is 0 mm. The distance between the foam layers 3H is about 200 mm.

Comparative Example 1 The above steel pipe was used. (Comparative Example 2) The viscoelastic body layer was provided over the entire inner wall of the steel pipe with a thickness of 1.5 mm.

The following properties were measured for the tubular composite or steel pipe of each example, and the measured values are shown in Table 5. A measuring device as schematically shown in FIG. 9 was used. The specimen 18 was supported by the hanging thread 10. A microphone 19 is installed on an extension of the axis of the tubular body 1 that constitutes the sample 18, and the microphone 19 and the sound level meter 2
0, a frequency analyzer 28, and a recorder 29 were sequentially connected.

As a measurement condition, the height of the microphone 19 is 1.2 m, and the distance between the microphone 19 and the test piece 18 is 1 m.
The height of the test piece 18 was 1.2 m. A 600 mm long hanging thread 10 was hung on the fulcrum 9, and a 45 g weight 8 was suspended at the end of the hanging thread 10. Lift the weight 8 in the opposite direction of the microphone 19 and move the hanging thread 10 about 9
It is fixed at an angle of 0 ° and then the weight 8
Was dropped and collided with the specimen 18.

The peak value (dB) of the sound generated at the time of this collision was measured and is shown in Table 5. Further, the peak value of generated sound of 98 dB in Comparative Example 1 (single steel pipe) was used as a reference value, and Table 5 shows the improvement amount of the peak value of generated sound from this reference value. In addition, the time from the time of the above collision until the generated sound is attenuated by 20 dB is measured, and as the vibration attenuation time (ms),
The results are shown in Table 5.

In addition, the weight of the steel pipe alone was measured, and then the weight of the tubular composite body after forming the viscoelastic body layer and the like was measured to calculate the weight increase amount. This weight increase is
The weight increase rate was calculated by dividing by the weight of the steel pipe below,
It was shown to.

[0069]

Table 5 Examples Comparative Examples 1 2 3 4 5 6 7 8 1 2 Blend of viscoelastic body BBBBBABBCB-C Maximum thickness of viscoelastic body layer (mm) 44 12 10 10 3 3 3 10-2 Peak value of generated sound [dB (A)] 72 73 84 86 85 78 75 74 98 92 Improvement amount of generated sound [dB (A)] 26 25 14 12 13 20 23 24-6 Vibration Decay time (ms) 25 30 50 80 70 40 30 30 270 120 Weight increase rate (%) 17 15 3 2 3 3 4 7-16 Structure of tubular composite Figure 1 Figure 2 Figure 5 Figure 3 Figure 3 4 Figure 7 --- A deformation

The sound level of Example 1 is 26 more than that of Comparative Example 1.
It is improved by dB, and the vibration damping time is about 1 / compared with that of Comparative Example 1.
Eleven. The weight increase rate is 17%. Example 2 is
The sound generation amount is improved by 25 dB as compared with Comparative Example 1, the vibration damping time is about 1/9 of Comparative Example 1, and the weight increase rate is 1
5%.

In Example 3, the amount of sound produced is 14 more than in Comparative Example 1.
It is improved by dB, and the vibration damping time is about 1 / compared with that of Comparative Example 1.
5, the weight gain is only 3%. Example 4 is
The sound generation amount is improved by 12 dB as compared with Comparative Example 1, the vibration damping time is about 1/3 of Comparative Example 1, and the weight increase rate is only 2%. This example has a particularly lightweight damping layer,
Great effect is obtained.

In Example 5, the amount of sound produced is 13 more than in Comparative Example 1.
It is improved by dB, and the vibration damping time is about 1 / compared with that of Comparative Example 1.
4 and the weight gain is only 3%. Example 6 is
The sound generation amount is improved by 20 dB as compared with Comparative Example 1, the vibration damping time is about 1/8 of Comparative Example 1, and the weight increase rate is only 3%.

In Example 7, the sound production amount was 23 compared with Comparative Example 1.
It is improved by dB, and the vibration damping time is about 1 / compared with that of Comparative Example 1.
9 and the weight increase rate is only 4%. Example 8 is
The sound generation amount is improved by 24 dB as compared with Comparative Example 1, the vibration damping time is about 1/9 of Comparative Example 1, and the weight increase rate is only 7%. These examples are particularly excellent in damping characteristics.

The sound amount of Comparative Example 2 is 6d more than that of Comparative Example 1.
B was improved, and the vibration damping time was about 1/2 that of Comparative Example 1.
And the weight increase rate is 16%. In this example, although the vibration damping effect is certainly recognized, in the present invention example, the weight increase rate is further greatly reduced, and the vibration damping time is further shortened, and the peak value of the generated sound is greatly reduced. It's getting low.

[0075]

According to the present invention, the vibration damping material is formed by pouring the liquid mixture at room temperature into the inner space, and then foaming and curing the mixture, which is lightweight and has a high vibration damping effect. A tubular composite is obtained. Moreover, there is no need to push the foam into the tubular body, and no heating is required, so
A tubular composite can be manufactured very easily and at low cost. This has succeeded in reducing the weight of the vibration damping tubular body and streamlining the manufacturing process.

As a result, in the power member such as the mechanical rotating body, the power loss can be reduced and it is not necessary to increase the output of the power source. In the structural member, the weight of the structure itself is reduced, so that it is possible to downsize the lower structure and reduce transport loss. In addition, since the tubular composite body can be manufactured very easily and at low cost, it can be applied to many uses, which is a great advantage. In particular, when a restraint material is used, the productivity of the tubular composite body is improved by using the restraint material to put the compound in the tubular body or by using the compound for molding the compound.

[Brief description of drawings]

1A and 1B are cross-sectional views of the tubular composite body of each example, taken in a direction perpendicular to an axis.

FIG. 2 (a) is a cross-sectional view of a tubular composite taken along a direction parallel to an axis, and (b) is a cross-sectional view of the tubular composite taken along a direction perpendicular to the axis. is there.

FIG. 3 (a) is a sectional view of the tubular composite taken along a direction parallel to the axis, and FIG. 3 (b) is a sectional view of the tubular composite taken along a direction perpendicular to the axis. is there.

FIG. 4 (a) is a cross-sectional view of the tubular composite taken along a direction parallel to the axis, and FIG. 4 (b) is a cross-sectional view of the tubular composite taken along a direction perpendicular to the axis. is there.

5A is a cross-sectional view of the tubular composite taken along a direction parallel to the axis, and FIG. 5B is a cross-sectional view of the tubular composite taken along a direction perpendicular to the axis. is there.

6A is a cross-sectional view of the tubular composite taken along a direction parallel to the axis, and FIG. 6B is a cross-sectional view of the tubular composite taken along a direction perpendicular to the axis. is there.

7A is a cross-sectional view of the tubular composite taken along a direction parallel to the axis, and FIG. 7B is a cross-sectional view of the tubular composite taken along a direction perpendicular to the axis. is there.

8A is a cross-sectional view of the tubular composite taken along a direction perpendicular to the axis, and FIG. 8B is a cross-sectional view of the tubular composite taken along a direction parallel to the axis. is there.

FIG. 9 is a schematic diagram schematically showing an apparatus for measuring vibration damping characteristics.

[Explanation of symbols]

1 Tubular body 1a Inner wall 1b, 1c End part 2, 12 Restraint material 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H, 3
I, 3J foam 4A, 4B cavity 5 inner space

Claims (8)

[Claims] 1. A tubular composite comprising a tubular body and a damping material provided in an inner space of the tubular body, wherein the damping material is a compound which is liquid at room temperature and is foamed and cured. A tubular composite, which is a foam made of. 2. The tubular composite body according to claim 1, wherein the foam is provided only in a part in a cross section parallel to the axis of the tubular body or a cross section perpendicular to the axis of the tubular body. 3. The tubular composite according to claim 1, wherein the maximum thickness of the foam is equal to or greater than the thickness of the tubular body. 4. The tubular composite body according to claim 1, wherein a restraint member is inserted into the inner space, and the restraint member and the tubular body are joined by the foamed body. 5. A method for producing a tubular composite body comprising a tubular body and a vibration damping material provided in the inner space of the tubular body, comprising pouring a liquid compound at room temperature into the inner space, Next, a method for producing a tubular composite, characterized in that the vibration damping material is formed by foaming and curing the composition. 6. The method of making a tubular composite according to claim 5, wherein the formulation is cast into the inner space to form an elongated adherent layer, which is then foamed and cured to form the foam. . 7. A mold is fixed in the inner space, the mixture is poured into a gap between the inner wall of the tubular body and the mold, and the mixture is foamed and cured in the gap to form the foam. The method for producing a tubular composite according to claim 5, wherein the mold is then removed from the inner space. 8. A restraint material is inserted into the inner space, and the compound is poured into a gap between the inner wall of the tubular body and the restraint material,
The method for producing a tubular composite according to claim 5, wherein the compound is foamed and cured in the gap to form the foam, and thereby the restraint member and the tubular body are joined by the foam.