JPH01204956A - Composition for vibration-damping material and vibration-damping material - Google Patents

Abstract

PURPOSE:To provide the subject composition excellent in stability, moldability, vibration-damping property, etc., by adding specified amounts of flaky, powdery and fibrous fillers to a resin component comprising an epoxy compound, a polyphenol and an imidazole. CONSTITUTION:An epoxy compound (e.g., bisphenol A epoxy resin) is mixed with a polyphenol (e.g., bisphenol A) and an imidazole (e.g., 2-methylimidazole) as a curing agent (cure accelerator). 100pts.wt. obtained resin-forming component is mixed with 50-500pts.wt. flaky filler (e.g., mica or glass flake), at most 200pts.wt. powdery filler (e.g., ferrite or silica) and at most 100pts.wt. fibrous filler (e.g., alumina or polypropylene fiber) to produce a composition for vibration-damping material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a composition for a damping material that can produce a damping material having excellent damping performance, and a damping material produced using this composition. The present invention relates to a vibration damping material, and more particularly, the present invention relates to a -liquid type vibration damping material composition and a vibration damping material manufactured using this composition.

In order to prevent the vibrations of the vibration source from being transmitted to other parts, it has been widely used to insert vibration-proof rubber or air springs between the vibration source and other parts. It is being done.

However, although these methods can prevent the transmission of vibrations, they cannot be expected to attenuate the vibrations themselves of the vibration source.

For this reason, a method has been adopted in which a damping material is brought into close contact with the vibrating body to attenuate the vibration itself of the vibrating body. This method basically utilizes the heat of conversion at the glass transition point or melting point of the resin component that makes up the damping material.
This is a method of attenuating vibration itself by converting vibration energy into heat.

Conventionally, resins such as polyamide resins, polyvinyl chloride resins, and epoxy resins have been used as materials constituting vibration damping materials for forming such damping materials.

However, damping materials molded from damping material compositions containing polyamide resin as the main component have poor water resistance and chemical resistance, and have low mechanical strength, so the conditions of use are limited. There was a problem. In addition, it is difficult to mold vibration damping materials whose main component is polyvinyl chloride resin into damping materials with complex shapes, and it is also costly to manufacture a wide variety of damping materials in small quantities. There was a problem.

On the other hand, damping materials containing epoxy resin as a main component basically have good damping performance. When producing a vibration damping material containing an epoxy resin as a main component, it is common to use a damping material composition that cures at room temperature.

By the way, when attaching damping material to parts of a certain shape that are manufactured in mass production, such as automobile parts or electrical parts, continuous methods such as cast molding, transfer molding, and press molding are used. It is desirable to adopt a production method that allows the addition of damping material.

However, since the commonly used room-temperature curing epoxy resin vibration damping composition is a two-component type consisting of a main component and a hardening agent, it is difficult to mold it using the above-mentioned molding method. When carrying out this process, it is necessary to provide a step of mixing the main agent and the curing agent in advance, which poses a problem in that the manufacturing process becomes complicated. Furthermore, room-temperature curing compositions for vibration damping materials generally have a short pot life, so they must be used up quickly after mixing the main component and curing agent, and the continuous damping material composition described above must be used quickly. There was also the problem that it was unsuitable for use in the method of manufacturing vibration materials.

In order to solve the problems of the two-component vibration damping material composition, the use of a latent curing agent as a curing agent is also being considered. However, when a commonly used latent curing agent for epoxy resin is used, there is a problem in that it is often difficult to obtain a damping material having sufficient damping performance.

The present invention aims to solve the problems associated with the prior art as described above, and is aimed at solving the problems associated with the prior art as described above. The object of the present invention is to provide a liquid-type vibration damping material composition that has suitable stability and excellent moldability.

A further object of the present invention is to provide a vibration damping material having excellent vibration damping performance and adhesive properties.

1. The composition for a damping material according to the present invention comprises a resin-forming component containing a compound having an epoxy group, polyhydric phenols, and imidazole, and based on 100 parts by weight of the resin-forming component,
A scaly filler in the range of 50 to 500 parts by weight, and 200 parts by weight.
Further, the vibration damping material according to the present invention contains a powdery filler of not more than 100 parts by weight and a fibrous filler of not more than 100 parts by weight. In a heat-cured body of a resin-forming component containing the following, a scale-like filler in the range of 50 to 500 parts by weight and a powder filler in an amount of 200 parts by weight or less per 100 ff parts of the heat-cured body; It is characterized in that 100 parts by weight or less of a fibrous filler is dispersed therein.

Although the composition for vibration damping material of the present invention is a liquid type, it has very excellent stability and moldability. Therefore, it can be particularly suitably used when a continuous manufacturing method using a molding device is adopted. Moreover, the damping material obtained by thermoforming using the composition for damping material of the present invention has excellent properties such as damping performance, durability, and adhesiveness.

1 friend! `` ■ Kuchi & Group The composition for vibration damping material and the vibration damping material according to the present invention will be specifically explained below.

In recent years, vibration damping materials have been increasingly manufactured using the continuous molding method as described above, so damping material compositions used for manufacturing vibration damping materials have good moldability. It is necessary that the material has excellent stability as well as excellent stability. Furthermore, in order for the damping material obtained using such a composition to have good damping performance, it is necessary that properties such as damping ratio, mass, and dynamic elastic modulus are well balanced.

In response to these demands, we selected an epoxy resin that inherently has good vibration damping performance as the resin component constituting the vibration damping material, and we investigated the problems caused by the use of epoxy resin, such as deterioration in moldability and stability of the composition. This problem can be solved by using a specific curing agent, and the vibration damping performance can be improved by using this epoxy resin together with a plurality of specific fillers.

The composition for vibration damping material according to the present invention includes, as a resin forming component,
These include compounds having epoxy groups, polyhydric phenols, and imidazoles.

Examples of compounds having an epoxy group used in the present invention include sorbitol polyglycidyl ether, pentaerythritol polyglycidyl ether, glycerol polyglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene Polyglycidyl ethers such as glycol diglycidyl ether and polypropylene glycol diglycidyl ether; Glycidyl esters such as phthalic acid diglycidyl ester, hexahydrophthalic acid diglycidyl ester and diglycidyl p-oxybenzoic acid ester; Alicyclic gepoxy acetals , alicyclic epoxy resins such as alicyclic gepoxy adipate, alicyclic gepoxy carboxylate and vinylcyclohexene dioxide; bisphenol type epoxy resins such as bisphenol A type epoxy resins and bisphenol F type epoxy resins niortu cresol novolak type Novolac type epoxy resins such as epoxy resins can be mentioned.

The epoxy equivalent of the compound having an epoxy group used in the present invention is usually 50 to 2,000.

If the epoxy equivalent is too high, the mechanical strength of the resulting damping material may decrease. In particular, in the present invention, a vibration damping material with particularly excellent properties such as mechanical strength and vibration damping performance is manufactured by using a compound having an epoxy group having an epoxy equivalent in the range of 75 to 1500 g/equivalent. be able to.

In addition to the above-mentioned compounds having epoxy groups,
A reactive diluent such as a monoepoxy compound can also be used to adjust the viscosity or impart flexibility to the vibration damping material composition.

° In the present invention, polyhydric phenols are appropriately selected from compounds having at least one benzene ring and at least two hydroxyl groups directly bonded to the benzene ring. Examples of polyhydric phenols that can be used include bisphenols such as bisphenol A and bisphenol F; hydroxybenzene derivatives such as hydroquinone, pyrogallol and brologlucine;
-methyl-4-glycidoxy-5-1-butylphenyl)butane and 1-[α-methyl-α-(4°-glycidoxyphenyl)ethyl]-4-[α°-α°-bis(
Compounds having a glycidoxyphenyl group such as 4°°-glycidoxyphenyl)ethyl]benzene, and phenyl novolac resins, cresol novolac resins, and octylphenyl novolac resins whose softening points are usually within the range of 80 to 120°C Examples include novolac resins.

These polyhydric phenols can be used alone or in combination.

Particularly preferred polyhydric phenols in the present invention are bisphenols and novolacs.

The amount of polyhydric phenols blended in the vibration damping material composition of the present invention is such that the amount of hydroxyl groups in the polyhydric phenol is usually 0.6 to 1 equivalent of the epoxy group of the compound having an epoxy group. It is set within the range of 1.3 equivalents. If it deviates from the above range, a three-dimensional structure may not be effectively formed in the resin forming the damping material, and the mechanical strength of the damping material may decrease. In particular, in the present invention,
By setting the blending amount of polyhydric phenols so that the amount of hydroxyl groups is within the range of 0.8 to 1.1 equivalents, a damping material with particularly excellent damping performance and mechanical strength is manufactured. be able to.

The vibration damping material composition of the present invention contains imidazoles.

As imidazoles that can be used in the present invention, unsubstituted imidazole, substituted imidazole having a substituent such as an alkyl group, an aryl group, an amino group, a hydroxyalkyl group or a cyanoalkyl group, and derivatives thereof can be used. Specific examples of imidazoles that can be used in the present invention include imidazole, 2-ethyl-4-methylimidazole, 2-undecylimidazole, 2-heptadecyl imidazole, 2-phenylimidazole, 1- Benzyl-2-methylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-ethylimidazole, 1-cyanoethyl-2-undecylimidazole, 1-cyanoethyl-2-undecylimidazolium trimetate, 1- Cyanoethyl-2-phenylimidazolium trimethate, 2-methylimidazolium isocyanurate, 2-phenylimidazolium
Isocyanate, 2,4-diamino-6-[2-methylimidazolyl-(1)]-]ethyl-8-triazine 2
,4-diamino-6-12-ethyl-4-methylimidazolyl-(1)]-]ethyl-3-riazine, 2゜4-
Diamino-6-[2-undecylimidazolyl-(1)
]-]Ethyl-8-triazine-2-phenyl-4,5-
Dihydroxymethylimidazole, 2-phenyl-4-
Methyl-5-dihydroxymethylimidazole, 1-cyanoethyl-2-phenyl-4,5-di(cyanoethoxymethyl)imidazole, 1-dodecyl-2-methyl-
Mention may be made of 3-imidazolium tallolide and 1,3-dibenzyl-2-methylimidazolium tallolide. These imidazoles can be used alone or in combination.

Particularly in the present invention, it is preferable to use imidazole substituted with an alkyl group having 1 to 5 carbon atoms at the 2-position of the imidazole ring.

The amount of imidazole compounded in the vibration damping material composition of the present invention is usually o, ooi to 0.3 mol, preferably 0 to 1 epoxy group equivalent of the compound having an epoxy group.
．． The amount should be within the range of 0.005 to 0.1 mole. When used within this range, the imidazole acts well as a curing accelerator and curing agent, improving the properties of the resulting damping material.

Furthermore, considering the curability of the composition for damping material and the damping performance of the obtained damping material, the blending ratio of polyhydric phenols and imidazoles in the composition for damping material of the present invention should be adjusted to For 1 g equivalent of the group, the latter is usually o, ooi ~ 0
．． 3 mol, preferably within the range of 0.005 to 0.3 mol.

The composition for a vibration damping material of the present invention contains the above-mentioned resin component and a specific amount of filler relative to the resin component. The filler used in the present invention has a specific shape.

That is, the fillers used in the present invention are scaly fillers, powder fillers, and fibrous fillers.

Among these fillers, the scaly filler mainly acts to improve the vibration damping performance and elastic modulus of the damping material.

Examples of scaly fillers that can be used in the present invention include mica, laminated mica, scaly graphite, alumina flakes, glass flakes, silicon carbide flakes, steel flakes, and scaly iron oxide. can be used alone or in combination.

The scaly filler used in the present invention has a scaly shape (
or plate-like), but especially if the aspect ratio is 5.
or more (preferably within the range of 20 to 100).

The amount of the scaly filler in the vibration damping material composition is within the range of 50 to 500 parts by weight based on 100 parts by weight of the resin-forming component in the composition. If the amount of the J# flaky filler blended is more than 500 parts by weight, the flowability of the composition will decrease and the moldability will deteriorate. In addition, if it is less than 50 parts by weight, the effect of using the scale-like filler will not be realized substantially.In particular, in the present invention, by using the scale-like filler within the range of 100 to 400 parts by weight, vibration damping performance and It becomes easier to obtain a damping material that is excellent in both durability.

The powdered filler contained in the vibration damping material composition of the present invention is
It compensates for the decrease in flowability of the composition due to the combination of the above-mentioned scaly filler, and also improves the mechanical strength of the vibration damping material, -
Furthermore, it has the effect of adjusting the density of the damping material.

Examples of powdered fillers that can be used in the present invention include ferrite, calcium carbonate, silica, talc, aluminum hydroxide and alumina powder. Considering the dispersibility into the material, it is preferable to use particles with an average particle diameter of 0.1 μm or more, particularly 0.2 to 5.0 μm.
By using a material within the above range, it becomes easy to produce a vibration damping material that has good flowability of the composition, good moldability, high mechanical strength, and good density.

The blending amount of the powdery filler in the resin composition for vibration damping material is 200 parts by weight or less based on 100 parts by weight of the resin forming component. If it exceeds 200 parts by weight, the flowability of the composition will deteriorate. In particular, by controlling the blending amount of the powdery filler within the range of 1 to 100 parts by weight, the moldability of the vibration damping material composition is improved and it becomes easier to obtain a vibration damping material with high mechanical strength.

The fibrous filler blended in the damping material composition of the present invention effectively prevents the scaly filler and powdery filler from settling in the composition, and also prevents the resulting damping material from settling. It has the effect of improving mechanical strength and further preventing deterioration of damping performance due to improved mechanical strength.

Examples of fibrous fillers that can be used in the present invention include inorganic fibrous fillers such as asbestos, rock wool, fibrous magnesium compounds, alumina fibers, calcium titanate fibers and carbon fibers, as well as synthetic pulps of polyolefins, Mention may be made of organic fibrous fillers such as polyamide resins, polyester resins, acrylic resins, polyvinyl alcohol resins and wood pulp.

The aspect ratio of these fibrous fillers is usually 10 to 10.
It is within the range of 00. Particularly preferred among these fibrous fillers are polyethylene synthetic pulp, fibrous magnesium compounds, and asbestos.

The content of the fibrous filler in the vibration damping material composition of the present invention is 100 parts by weight or less based on 100 parts by weight of the resin forming component. If it exceeds 100 parts by weight, the flowability of the composition will decrease.

In particular, in the present invention, it is preferable to use the fibrous filler in an amount of 1 to 50 parts by weight.

The vibration damping material composition of the present invention may further contain additives such as a plasticizer, an internal mold release agent, a coupling agent, an antifoaming agent, and a leveling agent.

For example, plasticizers include aromatic alcohols, alkylphenols, lactones, furfuryl alcohols,
Examples include phthalic acid esters, polyglycols, asphalt, coal tar, cationic polymers of aromatic compounds, and polymers of aromatic compounds and formaldehyde.

The amount of plasticizer used is usually less than 50 parts by weight per 100 parts by weight of the resin forming component. If more than 500 parts by weight is used, the strength of the damping material may decrease.

By using a plasticizer in this manner, the glass transition point or melting point can be adjusted to the operating temperature of the damping material, and the damping performance of the resulting damping material can be effectively utilized.

Examples of mold release agents that can be used in the present invention include stearic acid, and examples of coupling agents include silane-based and titanium-based compounds. Conventional antifoaming agents and leveling agents can be used.

The vibration damping material composition of the present invention can be produced by mixing the above components. However, when using a compound having an epoxy group, polyhydric phenols, and a plasticizer, these are usually mixed in advance by heating (usually at a temperature within the range of 50 to 200°C), and then heated at around room temperature. It is desirable to adopt a method of adding and mixing imidazoles, scale-like fillers, powder fillers, fibrous fillers, and other additives, and mixing by adding imidazoles with polyhydric phenols under heating. This is because the curing reaction progresses during the process.

A damping material can be manufactured by heating and curing the composition for a damping material prepared in this manner. In particular, the vibration damping material composition of the present invention can be suitably used in continuous production methods employing molding methods such as cast molding, transfer molding, and press molding.

For example, when manufacturing a vibration damping material using the above-mentioned method, the above heat curing temperature and heat curing time of the vibration damping material composition are set, and if desired, the composition is molded under pressure. can be done.

The vibration damping material manufactured in this way consists of a heat-cured resin-forming component containing a compound having an epoxy group, polyhydric phenols, and imidazoles, and a scale-like filler, a powdery filler, and a fibrous filler. The content of these fillers in the damping material is 5 parts by weight of the scaly filler per 100 parts by weight of the thermoset resin constituting the damping material.
Within the range of 0 to 500 parts by weight (preferably 100 to 40 parts by weight)
0 parts by weight), 200 parts by weight or less (preferably 1 to 100 parts by weight) of powdered filler, and 100 parts by weight or less (preferably 1 to 50 parts by weight) of fibrous filler. within range).

The heat-cured product includes a compound having an epoxy group, a polyhydric phenol having an amount of hydroxyl groups in the range of 1.3 to 0.6 equivalents per equivalent of the epoxy group of this compound, and an epoxy group. It has a structure derived from 1 to 10 parts by weight of imidazole based on 100 parts by weight of the compound.

As described above, the vibration damping material composition of the present invention is a highly stable one-component type, and is therefore particularly suitable for use in the above-mentioned molding method. However, the composition for a damping material of the present invention is not limited to the above-mentioned method, but can also be used, for example, in a method in which it is directly filled into a space of a vibration source such as metal or concrete and then heated and cured.

The composition for vibration damping materials according to the present invention has excellent stability despite being a one-component type by combining a compound having an epoxy group and a specific curing agent. Furthermore, the tendency for vibration damping performance, mechanical strength, etc. to deteriorate due to the use of specific hardening agents can be effectively prevented by blending three types of fillers with different shapes. can do. Therefore, the composition for a vibration damping material of the present invention can be effectively used in a method for continuously manufacturing a vibration damping material. In particular, since the vibration damping material composition of the present invention is of a -liquid type, by using it,
The process of calculating in advance the amount to be used during molding and accurately preparing the corresponding amount of the composition in advance is no longer necessary, and the production of the damping material does not become complicated.

Furthermore, the damping material obtained by thermoforming using the composition for damping material of the present invention is a heat-cured product of epoxy resin using a compound having an epoxy group and further using a specific curing agent and filler. By doing so, the respective resin-forming components interact with each other, resulting in good properties such as vibration damping performance, mechanical strength, and adhesiveness.

EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

100 parts by weight of bisphenol A type epoxy resin with a Yue boxy equivalent of 188 g/equivalent, 57 parts by weight of a bisphenol novolac resin with a softening point <UCC method) of 97°C, and 350 parts by weight of a phenol-modified aromatic polymer oil as a plasticizer were charged into a planetary mixer. , and mixed for 1 hour at a temperature of 100° C. to obtain a homogeneous resin solution.

After cooling this resin solution to room temperature, 1.5 parts by weight of 2-methylimidazole, 300 parts by weight of mica (aspect ratio: 70) as a scaly filler, and ferrite (average particle size: 1 μm) as a powdery filler were added. ) and 1 part by weight of a fibrous magnesium compound (average aspect ratio: approximately 50) as a fibrous filler were added and kneaded for 30 minutes at room temperature to prepare a composition for a damping material of the present invention. .

Separately, prepare a mold loaded with a steel plate 5 mm thick, 30 mm wide, and 300 mm long that has been previously degreased and sandblasted, and apply the above vibration damping material composition onto this steel plate to a thickness of 5 mm and a width of 3 Q mm. The damping material of the present invention was manufactured by applying the mixture to a length of 300 mm and press-molding it. Note that the curing temperature at this time was set to 130° C., and the heat curing time was set to 1 hour.

The adhesion, formability and storage stability of the obtained composition for damping material to a steel plate, as well as the adhesion of the damping material, were measured.

The measurement method is as follows.

(Vibration damping performance) The vibration damping ratio of the first bending mode (approximately 300 Hz) was determined by changing the measurement temperature using the two-point suspension resonance method.

The maximum value of the vibration damping ratio (C/Cc) IlaX and the temperature at that time (T 1a
x) is shown in Table 1.

(Moldability) Those in which no curing due to poor flow of the composition or cracking due to curing shrinkage are observed in the damping material obtained are considered to be acceptable in Table 1.
Please write it in.

(Adhesiveness) After measuring the damping performance, the adhesive force measurement jig (
Shape: cylindrical, diameter: 20 mm) was adhered with an epoxy adhesive, and the damping material around the jig was cut using a core drill until it reached the steel plate.

Next, the jig was pulled perpendicularly to the damping material surface using a tensile tester to measure the adhesive strength.

The results are shown in Table 1.

The meanings of the symbols in Table 1 are as follows.

A-111 adhesive strength is 30 kgf/cm" or more.

B-111 adhesive strength is 20 kfJf / crm2 or more 3
0 k (If /cn2).

C-111 adhesive force is less than 20 kgf/c112.

(Storage stability) Both the vibration damping material composition immediately after preparation and after being stored at 15°C for 3 months were tested using a JSR type Curastmeter (manufactured by Hitoshi Kikai Kogyo Co., Ltd.). The curing rate was measured using

That is, if the maximum torque value is 1/2 or more of that immediately after blending, it is indicated in Table 1 that the storage stability is acceptable.

In addition, in Examples 2 to 5 described below, the properties of vibration damping performance, moldability, adhesiveness, and storage stability were also measured by the above method.

In place of the bisphenol A epoxy resin used in Example 1, a bisphenol A epoxy resin with an epoxy equivalent of 475 g/equivalent was used, the amount of phenyl novolac resin used was 23 parts by weight, and a phenol-modified aromatic resin was added. Example 1 except that the amount of group polymerized oil used was 170 parts by weight.
A composition for a vibration damping material was prepared in the same manner as described above, and a vibration damping material was manufactured in the same manner except that this composition was used.

The adhesion, formability and storage stability of the obtained composition for damping material to a steel plate, as well as the adhesion of the damping material, were measured.

The results are shown in Table 1.

X Saturday Week 3 A composition for a damping material was prepared in the same manner as in Example 1, except that the amount of phenol-modified aromatic polymerized oil used was 33 parts by weight in Example 2, and this composition was used. A damping material was manufactured in the same manner except for that.

The adhesion, formability and storage stability of the obtained composition for damping material to a steel plate, as well as the adhesion of the damping material, were measured.

The results are shown in Table 1.

[X-in-law] 4 Instead of the bisphenol A type epoxy resin used in Example 1, an orthocresol novolac type epoxy resin (epoxy equivalent: 225) was used, 50 parts by weight of bisphenol A was used instead of the phenyl novolac resin, and a phenol-modified aromatic resin was used. A composition for a vibration damping material was prepared in the same manner as in Example 1 except that the amount of the group polymerized oil used was 44 parts by weight, and a vibration damping material was produced in the same manner except that this composition was used.

Measure the adhesion, formability and storage stability of the obtained composition for damping material to steel plates, as well as the adhesion of the damping material.
The results are shown in Table 1.

Example 1 Except that the total equivalent of diglycidyl ether of polypropylene glycol (epoxy equivalent; 172 g/equivalent) and the phenol-modified aromatic polymer oil were not used instead of the bisphenol A-type epoxy resin used in Example 1. A vibration damping material composition was prepared in the same manner as in Example 1, and a vibration damping material was manufactured in the same manner except that this composition was used.

The adhesion, formability and storage stability of the obtained composition for damping material to a steel plate, as well as the adhesion of the damping material, were measured.

The results are shown in Table 1.

Claims (4)

[Claims] (1) A resin-forming component containing a compound having an epoxy group, polyhydric phenols, and imidazoles, and a scale-like filler in the range of 50 to 500 parts by weight based on 100 parts by weight of the resin-forming component; A composition for a vibration damping material, comprising at most 100 parts by weight of a powdery filler and 100 parts by weight or less of a fibrous filler. (2) The amount of hydroxyl groups of polyhydric phenol in the composition for vibration damping material is within the range of 1.3 to 0.6 equivalents per equivalent of epoxy group of the compound having an epoxy group, and The amount of imidazole compounded in the composition for vibration material is
1 to 1 per 100 parts by weight of the compound having an epoxy group
The composition for vibration damping material according to claim 1, wherein the composition is within the range of 0 parts by weight. (3) In a heat-cured product of a resin-forming component containing a compound having an epoxy group, polyhydric phenols, and imidazole, 50 to 500
A vibration damping material comprising a scale-like filler within a range of 200 parts by weight or less, a powdery filler of 200 parts by weight or less, and a fibrous filler of 100 parts by weight or less. (4) The heat-cured body contains a compound having an epoxy group, a polyhydric phenol having an amount of hydroxyl groups in the range of 1.3 to 0.6 equivalents per 1 equivalent of the epoxy group of the compound, and the epoxy group. 4. The damping material according to claim 3, which is a heat-cured material derived from imidazoles in an amount of 1 to 10 parts by weight per 100 parts by weight of the compound having the following.