JPH04218554A - Composition for complex type vibration damper - Google Patents

Abstract

PURPOSE:To obtain a composition for complex type vibration damper suitable for manufacturing a complex type vibration damper providing excellent vibration-damping properties not only in a normal temperature range but also in a temperature range up to high temperature range, having extremely excellent adhesiveness to metallic materials, forming a viscoelastic intermediate layer hardly flowing approximately at a baking temperature of coating compound, showing water resistance and oil resistance. CONSTITUTION:100 pts.wt. composition comprising 30-90 pts.wt. modified block copolymer prepared by modifying a block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a functional group-containing vinyl compound and 10-70 pts.wt. tackifier resin having <=160 deg.C softening point is blended with 0.01-40 pts.wt. crosslinking agent capable of being reacted with the functional group of the vinyl compound to give a composition for complex type vibration-damper.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a composite vibration damping material composition used at high temperatures from room temperature to about 100°C, and more specifically, the present invention relates to a composition for a composite vibration damping material used at high temperatures from room temperature to about 100°C. A composition used when manufacturing composite vibration damping materials with high vibration absorption performance that can reduce these vibrations and reduce noise when used at high temperatures from room temperature to about 100 degrees Celsius. relating to things.

0002

[Background Art] In recent years, with the development of transportation systems and the proximity of residences to factories, noise and vibration problems have become a social problem as pollution. and vibrations. In response to such trends, there is a demand for providing vibration damping performance to rigid substrates such as metal materials that are sources of noise and vibration, and to improve the vibration damping performance.

[0003] Therefore, one of the conventional materials that exhibits such vibration damping performance is a composite vibration damping material having a three-layer structure in which a viscoelastic intermediate layer made of a viscoelastic resin is sandwiched between two rigid substrates. For example, if the rigid substrate is metal, it can be used for automobile oil pans, engine covers, dashboard panels and floors, hopper chutes, conveyor equipment stoppers, home appliances,
It has been studied and adopted in various other applications, such as vibration reduction members for metal processing machines and structural members of precision machines where vibration prevention is desired.

[0004] In this case, the metal materials constituting the two metal layers may be any metal material that can face each other and sandwich a viscoelastic resin between them to form a damping material.
Examples include two metal plates, two concentric metal tubes, two sections, two molded bodies that can be stacked on top of each other, a metal molded body and a backing plate, and other two-layered structures. . The metal forming the metal layer here is not particularly limited, but usually includes iron, aluminum, copper, lead, or alloys containing these as one component, as well as zinc, tin, chromium, etc. It may also be a metal material plated with epoxy resin, a melamine resin, or the like.

[0005] As the viscoelastic resin constituting the viscoelastic intermediate layer of such a composite vibration damping material, a polyester resin or a resin composition consisting of a polyester resin and a polyolefin resin (Japanese Unexamined Patent Application Publication No. 61-89, 842), a resin composition consisting of an amorphous polyester resin and a low-crystalline polyester resin (Japanese Unexamined Patent Publication No. 62-18,160), an acrylonitrile-butadiene copolymer (Japanese Unexamined Patent Publication No. 60-245, No. 550), and compositions comprising hydroxyl group-containing liquid diene polymers (Japanese Patent Laid-Open No. 60-190,
No. 350, JP-A-61-207,746, JP-A-61
-261,040 and JP-A No. 62-167,042), from ethylene/maleic anhydride copolymer and/or terpolymer of ethylene/maleic anhydride/alkyl (meth)acrylate. (Unexamined Japanese Patent Publication No. 62-46)
, No. 638, Japanese Unexamined Patent Publication No. 62-46,639),
A composition comprising a styrene copolymer and an olefin copolymer (Japanese Unexamined Patent Publication No. 62-64,844) has been proposed.

By the way, the first characteristic required of such a composite damping material is high damping performance, which is generally expressed by the magnitude of the loss coefficient. Secondly, since the composite vibration damping material is used as a structural member and is also subjected to secondary processing such as press processing, the adhesive strength between it and the viscoelastic intermediate layer made of viscoelastic resin is important, especially in terms of shear resistance. One example is its high adhesive strength. Furthermore, thirdly, the composite vibration damping material subjected to press processing may undergo a baking coating process in which it is heated to about 200°C, and the intermediate layer resin composition must not flow out at around this temperature. is required to have water resistance and oil resistance so that the interlayer resin composition will not be damaged by water, antirust oil, etc. and the adhesive strength will not be significantly reduced when put into practical use.

[0007] In particular, in the case of damping materials that exhibit excellent damping performance in the temperature range from normal temperature to high temperature from 0 to 100°C,
The glass transition region of the viscoelastic intermediate layer resin composition must be around or below room temperature, and the composition has a low elastic modulus at room temperature. On the other hand, compositions exhibiting a high elastic modulus are generally superior in terms of shear adhesive strength, which has an important effect on press workability. In other words, the vibration damping performance required for composite vibration damping materials and the shear adhesive strength related to press workability are contradictory requirements regarding the elastic modulus of the viscoelastic intermediate layer resin, and the durability is also low. Durability against water and durability against oil are also contradictory required properties. Composite vibration damping materials manufactured using the above-mentioned conventional viscoelastic compositions cannot fully satisfy both the characteristics of damping performance and shear adhesive strength, as well as the characteristics of water resistance and oil resistance. It is insufficient as a viscoelastic composition for use.

For example, among the above-mentioned conventional techniques, Japanese Patent Laid-Open No. 62-46,638 and Japanese Patent Laid-Open No. 62-46,6
The technologies described in Publication No. 39 have excellent damping performance in a high temperature range, but have low damping performance in a temperature range from room temperature to high temperature, and are not suitable as a composite vibration damping material composition. It's not satisfying. Also, JP-A-59-80,454
The technology described in the publication has as essential components a crystalline polyolefin modified with an unsaturated carboxylic acid and an amorphous polymer. Due to its crystallinity, polyolefin has very low vibration damping performance in the temperature range from room temperature to high temperature, and even when it is combined with an amorphous polymer, the vibration damping performance in the temperature range from room temperature to high temperature is still poor. It is not sufficiently satisfactory as a composite vibration damping material composition.

Furthermore, in the case of the composition made of polyester resin disclosed in JP-A No. 62-18,160, water resistance is insufficient due to its hydrophilic nature, and the styrene-based composition disclosed in JP-A No. 62-64,844 lacks water resistance. In the case of a composition made of a polymer and an olefin copolymer, oil resistance is insufficient due to its lipophilicity, and it is not fully satisfactory as a composition for a composite vibration damping material.

0010

[Problems to be Solved by the Invention] As a result of intensive studies in order to obtain a composite type vibration damping material that does not have the above-mentioned problems, the present inventors have developed a functional block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon. A composite vibration damping material using as a viscoelastic intermediate layer a composition formed by blending a modified block copolymer modified with a vinyl compound having a group with a specific tackifying resin and a crosslinking agent is capable of being used at temperatures ranging from room temperature to high temperatures. The present invention was achieved by discovering that it has an excellent balance of vibration damping properties and adhesive strength in this area, can form a viscoelastic intermediate layer that does not easily flow out even near the baking temperature of the paint, and has both water resistance and oil resistance. did.

Therefore, the object of the present invention is to provide excellent vibration damping properties not only in the normal temperature range from low temperatures to room temperature, but also in the high temperature range of about 100°C, and to provide good adhesion to metal materials. To provide a composition suitable for producing a composite vibration damping material that is capable of forming a viscoelastic intermediate layer that does not easily flow out even near the paint baking temperature, and has both water resistance and oil resistance. be.

0012

[Means for Solving the Problems] That is, the present invention provides 30 to 90 parts by weight of a modified block copolymer obtained by modifying a block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a vinyl compound having a functional group. A composite type obtained by blending 0.01 to 40 parts by weight of a crosslinking agent capable of reacting with the functional group of the vinyl compound to 100 parts by weight of a composition consisting of 10 to 70 parts by weight of a tackifier resin having a temperature of 160°C or less. A composition for a vibration damping material, wherein the crosslinking agent is an epoxy compound,
For room-temperature composite vibration damping materials that are a mixture of any one or a combination of two or more selected from amine compounds, isocyanate compounds, metal alcoholate compounds, guanamine/melamine compounds, aziridyl compounds, and oxazoline compounds. It is a composite type composition, which is a hydrogenated block copolymer obtained by hydrogenating a modified block copolymer obtained by modifying a block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a vinyl compound having a functional group. This is a composition for shaking materials.

The present invention will be explained in detail below. First, the composite damping material in the present invention is the two types mentioned at the beginning.
It has a so-called three-layer structure in which a viscoelastic intermediate layer for bonding these metal layers to each other is sandwiched between two metal layers.

The first component of the resin composition forming the viscoelastic intermediate layer is a modified block copolymer obtained by modifying a block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a vinyl compound having a functional group. Such a modified block polymer is a block copolymer containing at least one polymer block of a conjugated diene compound and at least one, preferably two or more polymer blocks of a vinyl aromatic hydrocarbon. It is modified with a compound. In the modified block copolymer, the weight ratio of the conjugated diene compound and the vinyl aromatic compound is 95/5 to 60/4.
The range of 0 is preferable, and the number average molecular weight is 10,000 to 1.
A range of 00,000 is preferred. Further, the molecular structure thereof may be linear, branched, radial, or a combination thereof.

Conjugated diene compounds constituting the block copolymer of the present invention include those having 4 to 8 carbon atoms, such as butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, and 1,3-pentadiene. The preferred conjugated diene is butadiene. Examples of vinyl aromatic hydrocarbons include styrene, o-methylstyrene, p-methylstyrene, 1,3-dimethylstyrene, α-methylstyrene, and vinylnaphthalene, but preferred vinyl aromatic hydrocarbons include It is styrene.

The block copolymer of the present invention is generally synthesized by anionic living polymerization using an organolithium compound as a catalyst in an inert hydrocarbon solvent such as benzene. Modification with a functional group-containing vinyl compound is not particularly limited in its production method, and can generally be achieved by adding the functional group-containing vinyl compound in a solution or molten state with or without the use of a radical initiator.

Next, as the above functional group-containing vinyl compound, α,β-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, and cis-4-cyclohexene-1,2-carboxylic acid are used. , alicyclic unsaturated carboxylic acids, and their anhydrides, esters, amides, imides, derivatives such as metal salts, and the like. Also included are vinyl group-containing silane compounds such as vinyltriethoxysilane, vinyltriethoxysilane, and γ-methacryloxypropyltrimethoxysilane, and vinyl group-containing nitrogen compounds such as N-vinylcaprolactam and N-vinylsuccinimide. A preferred functional group-containing vinyl compound is maleic anhydride.

The reason why it is necessary to modify the block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a vinyl compound having a functional group in the present invention is that by modifying it with a vinyl compound having a functional group, the block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon can be modified with a vinyl compound having a functional group. By reacting this functional group with a crosslinking agent, the block copolymer changes from thermoplastic to thermosetting, significantly improving heat resistance and oil resistance. This is because it becomes possible to further improve adhesive strength.

Furthermore, it is more preferable that the modified block copolymer is hydrogenated. The reason for this is that the unsaturated bonds derived from the conjugated diene in the modified block copolymer are hydrogenated, which significantly improves its mechanical strength and makes it extremely stable against heat, making it possible to bake paints. This is because excellent heat resistance can be imparted with almost no decrease in adhesive strength even after the bonding process has been completed. Also,
As a production method, hydrogenation is generally achieved by hydrogenating the block copolymer in a solution or molten state using a catalyst such as Ni, Pd, Co, or the like.

On the other hand, the second component used together with the modified block copolymer of the present invention is a tackifying resin having a softening point of 160° C. or lower. A tackifier resin with a softening point exceeding 160° C. will have a strong adhesive strength (T-peel, shear), but its damping properties at room temperature will be significantly reduced, making it unusable. The tackifier resins with a softening point of 160°C or less used in the present invention include terpene resins such as terpenes and hydrogenated terpenes, rosin resins such as rosin, rosin esters, and hydrogenated rosin esters, aliphatic petroleum resins, and aromatic petroleum resins. Among them, terpenes, hydrogenated terpene resins, and aliphatic petroleum resins are particularly preferred.

The reason for using two resin components in the present invention, namely the modified block copolymer and the tackifying resin, is that although the modified block copolymer has excellent adhesive strength, it is Its damping properties at high temperatures are low, and it cannot be used alone as a damping material for temperatures ranging from room temperature to high temperatures.
Tackifier resin alone is extremely hard and brittle, and therefore cannot be used as a vibration damping material for temperatures ranging from room temperature to high temperature. However, by blending the two, the hard segment caused by the vinyl aromatic hydrocarbon block contained in the modified block copolymer is weakened, and vibration damping properties are significantly exhibited in the temperature range from room temperature to high temperature. As a result, it is possible to obtain an excellent composition with well-balanced vibration damping properties and adhesive strength from room temperature to high temperatures.

Furthermore, among tackifier resins, terpenes, hydrogenated terpenes, and aliphatic petroleum resins have a carbon skeleton consisting only of aliphatic molecules, so they have remarkable vibration damping properties from room temperature to high temperatures. It has the effect of causing expression.

[0023] Furthermore, the blending ratio of the modified block copolymer and the tackifying resin is such that the modified block copolymer is 30 to 9
0 parts by weight, preferably 40 to 80 parts by weight, and 70 to 10 parts by weight, preferably 60 to 20 parts by weight of the tackifying resin. If the amount of the modified block copolymer is less than 30 parts by weight, the damping property at high temperatures will be high, but the damping property at room temperature will be impaired, and if it exceeds 90 parts by weight, the damping property at room temperature will be low; Therefore, it cannot be used as a composite vibration damping material composition for high temperatures.

Next, the present invention requires a crosslinking agent as a third component. This crosslinking agent is capable of reacting with functional groups derived from the functional group-containing vinyl compound that is a component of the modified block copolymer, and the crosslinking reaction significantly improves the heat resistance of the composition, allowing it to reach temperatures close to the baking temperature of the paint. It is possible to suppress the outflow of oil and to significantly improve oil resistance. Moreover, the adhesive strength (T-peel, shear) can be further improved, and a very preferable composition can be obtained.

Examples of such crosslinking agents include compounds that can react under specific conditions with the functional groups derived from the functional group-containing vinyl compounds, such as epoxy compounds, amine compounds, isocyanate compounds, metal alcoholate compounds, and guanamine. - Any one type of compound or a mixture of two or more types selected from melamine compounds, aziridyl compounds, and oxazoline compounds can be mentioned. Among these, when the functional group is a carboxylic acid or a carboxylic acid anhydride, isocyanate compounds such as diphenylmethane diisocyanate and epoxy compounds such as bisphenol A type epoxy resin, which are highly reactive with carboxylic acids and carboxylic anhydrides, are particularly preferred.

The amount of these crosslinking agents to be used varies depending on the type thereof, but is preferably 40 parts by weight or less, preferably 0.01 to 30 parts by weight, based on 100 parts by weight of the total amount of the modified block copolymer and tackifying resin. be. If the amount exceeds 40 parts by weight, the composition becomes very hard and vibration damping properties at room temperature deteriorate, which is not preferable. Further, as long as the crosslinking agent is in the above blending range, the blending method and blending order are not limited.

[0027] Furthermore, the adhesive strength (T-peel,
An inorganic filler may be added to further improve the shearing properties. The inorganic filler used for this purpose is 25
It must be a material that does not thermally decompose even when heated to about 0°C, such as talc, clay, titanium oxide, silica, alumina, mica, zinc white, carbon black, graphite, etc., but it especially improves shear strength. It is preferable to use one or more of talc, clay, silica, and carbon black in order to have a large effect on the carbon black. The amount added is preferably 1 to 100 parts by weight, preferably 5 to 50 parts by weight, based on 100 parts by weight of the total amount of the modified block copolymer and tackifying resin.

The composition of the present invention may also contain the above-mentioned modified block copolymer in order to improve the damping performance or the elastic modulus within a range that does not impair the overall performance as a vibration damping material. A mixture of resins other than the tackifying resin may also be used. Examples of these resins include styrene resins such as polystyrene, maleic anhydride-modified polystyrene, AS resin, ABS resin, MS resin, and SBR (block or random) resin, ethylene/α-olefin copolymers, and ethylene/acetic acid. Olefin resins such as vinyl copolymers, propylene/ethylene copolymers, propylene/butene copolymers, rubber resins such as natural rubber, polyisoprene rubber (IR), butyl rubber (IIR), polyester elastomers, and polyamides. Examples include resins such as elastomers.

Furthermore, a plasticizer may be added in order to shift the glass transition temperature of the resin composition to a desired value. Plasticizers used for this purpose include, for example, polyester plasticizers, polyether ester plasticizers, phosphoric acid esters, epoxy plasticizers, ester plasticizers such as phthalic acid diesters, sebacic acid diesters, etc. Examples include acidic plasticizers, chlorinated paraffins, etc., which are appropriately selected and used depending on the type of modified block copolymer and tackifying resin used.

[0030] Furthermore, a coupling agent such as silane or titanium may be added in order to improve adhesion to metal materials. In order to improve heat resistance, phenol-based, phosphorus-based, sulfur-based, and other antioxidants may be added.

Furthermore, conductivity can be imparted to the viscoelastic composition by blending a conductive solid substance as a filler, and the resulting damping material can be made into a spot weldable material. Conductive substances used for this purpose include metal materials such as stainless steel, zinc, tin, copper, brass, and nickel processed into powder, flake, fiber, wire, etc. . These conductive substances may be used alone, or two or more of them may be used as a mixture. In order to obtain better spot weldability at this time, if the conductive substance is in powder form, the maximum particle size should be adjusted, and if it is in flake form, the maximum thickness should be adjusted. If it is in the form of a fiber, its maximum diameter is taken as its representative length (L), and the ratio (L) of this representative length (L) to the thickness (T) of the intermediate resin layer of the composite vibration damping material. /T) to 0
．． 5 or more, preferably 0.8 or more, more preferably 1.
It is preferable to set it to 0 or more.

The thickness of the viscoelastic intermediate layer formed from the composition of the present invention is appropriately selected depending on the required vibration damping performance, etc., but from the viewpoint of vibration damping performance, it is 10 μm or more, preferably 20 μm or more. The thickness is 300 μm or less, preferably 200 μm or less from the viewpoint of press workability of the composite damping material.

[0033] The method for producing the composite damping material using the composition of the present invention is not particularly limited, and may be any method such as a batch method using a cut plate or a continuous method using a coil. can be adopted. On the other hand, methods for compounding viscoelastic resin and metal materials include methods such as dissolving the viscoelastic resin in a solvent and applying it to the metal material in the form of a paint, and pasting it together using a T-die extruder. Examples include a method of forming an intermediate layer of viscoelastic resin on a metal material, and a method of sandwiching a film-like viscoelastic resin produced offline between metal materials as an intermediate layer and bonding with hot melt adhesive. Any method can be adopted depending on the purpose, such as the properties of the composition or the type of composite damping material to be obtained.

[0034]

EXAMPLES The present invention will be specifically explained below based on Examples and Comparative Examples, but the scope of the present invention is not limited by the Examples.

Examples 1 to 5 and Comparative Examples 1 to 3 Table 1 shows examples and comparative examples of vibration damping materials for room temperature that are mainly used at room temperature. Modified SEBS resin (modified SEBS resin) in which a block copolymer consisting of butadiene was modified with maleic anhydride and hydrogenated (
In A), the weight ratio of styrene and ethylene/butylene is 20
/80 and an acid value (mg, CH3 ONa/g) of 10 (modified SEBS), and the hydrogenated block copolymer used in the comparative example was a combination of the above modified hydrogenated block copolymer and styrene/ A copolymer with the same weight ratio of ethylene and butylene but not modified with maleic anhydride (unmodified SEB
S). As the tackifying resin, a hydrogenated terpene resin with a softening point of 115°C and a coumaron resin with a softening point of 120°C were used.

[0036] Also, as a crosslinking agent, an epoxy equivalent of 184
~194 and 3,000-5,000 bisphenol A epoxy resins (Epicote 828 and Epicote 1
010, manufactured by Yuka Shell Epoxy Co., Ltd.) was used. Further, as a filler, talc having a particle size of 3 to 4 μm was used.

Examples 6 to 9 Next, Table 2 shows examples and comparative examples of high-temperature vibration damping materials mainly used at high temperatures.
The resin (B) has a weight ratio of styrene and ethylene/butylene of 30/70 and an acid value (mg, CH3 ONa/g) of 1.
0 copolymer (modified SEBS). Further, as the tackifier resin, a hydrogenated terpene resin with a softening point of 130°C and a coumaron resin with a softening point of 120°C were used.

[0038] In each of the Examples and Comparative Examples shown in Tables 1 and 2 above, the compositions and vibration damping steel plates used for the tests were produced by the methods described below. That is, first, a modified hydrogenated block copolymer (modified SEBS) or a hydrogenated block copolymer (SEBS) and a tackifier resin were mixed at 100%
Roll kneading was carried out at ~180°C, and when a filler was added, the filler was added and thoroughly kneaded, and the resulting composition was dissolved in xylene to form a paint-type composition. After adding a predetermined amount of epoxy resin to this paint-type composition and mixing well, the composition was coated on a cold-rolled steel plate using a bar coater at 180°C.
After drying for 3 minutes at a temperature of 150~22
A composite damping material having a viscoelastic resin intermediate layer with a thickness of approximately 50 μm was prepared by heat-pressing at a temperature of 0° C. for 3 minutes. The adhesive strength (T-peel and shear) and vibration damping performance of the composite damping material thus prepared were measured. The results are shown in Tables 1 and 2, respectively.

[0039] The T-peel adhesive strength is JIS K
Evaluation was made at a tensile speed of 50 mm/min based on the JIS K 6854 test method, and shear adhesive strength was evaluated at a tensile speed of 5 mm/min based on the JIS K 6850 test method. In addition, vibration damping performance is determined by measuring the loss coefficient (η) representing vibration absorption ability using the mechanical impedance method, and measuring the maximum value of η (ηmax
) and the temperature (Tp) at which this ηmax is exhibited.The low-temperature vibration damping performance was evaluated using the loss coefficient (η20c) at 20°C. Furthermore, the outflow start temperature and oil resistance of the composition were evaluated by applying the paint-type composition containing the above-mentioned epoxy resin onto release paper, and
The composition was dried at ℃ for 3 minutes and peeled off from the release paper. The outflow start temperature was measured using an elevated flow tester (manufactured by Shimadzu Corporation) under the conditions of a die diameter of 0.5 mmφ, a die length of 1 mm, and a pressure of 10 kgf/cm2. Judgment was made based on resolubility in xylene at room temperature.

[0040]

[Table 1]

[0041]

[Table 2]

[0042] From the results in Table 1, Examples 1 to 5 of the present invention, which are used as vibration damping materials for room temperature, have high adhesive strength (T-peel, shear) and high vibration damping properties at room temperature. Furthermore, due to the reaction between the functional groups in the modified hydrogenated block copolymer and the crosslinking agent, the composition does not run out at around 200°C, which is the baking temperature of the paint. In addition, the oil resistance is significantly improved as it is insoluble in xylene solvents. On the other hand, as shown in the Comparative Examples, Comparative Example 1 has low vibration damping properties at room temperature and cannot be put to practical use, and Comparative Example 2 using an unmodified hydrogenated block copolymer
In No. 3 to 3, the block copolymer has no functional group, so the adhesive strength is low, and since no reaction with the crosslinking agent occurs, the composition flows out at 200° C. or lower, and the oil resistance is also poor.

From the results in Table 2, it can be seen that Examples 6 to 9 of the present invention, which are used as high-temperature vibration damping materials, have high adhesive strength (T-peel and shear), especially at high temperatures of about 60 to 100°C. The composition has excellent vibration damping properties. Further, at about 200° C., there is no outflow of the composition, and oil resistance is improved.

From the above results, a composition consisting of a modified block copolymer obtained by modifying a block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a vinyl compound having a functional group, a tackifying resin, and a crosslinking agent exhibits vibration damping properties. Performance and adhesive strength (T
It was found to be an excellent composite damping material with a good balance of peeling and shearing, the composition did not flow out even at high temperatures of about 200°C, and improved oil resistance.

[0045]

[Effects of the Invention] The composite vibration damping material composition of the present invention has two
The resulting composite vibration damping material has excellent adhesive properties and exhibits excellent vibration damping performance in the range from around room temperature to high temperatures of about 100 degrees Celsius, and has excellent durability ( It exhibits high temperature spill resistance and oil resistance) and is extremely useful industrially.

Claims (3)

[Claims] Claim 1: 30 to 90 parts by weight of a modified block copolymer obtained by modifying a block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a vinyl compound having a functional group, and a tackifying resin 10 having a softening point of 160° C. or less. A composite vibration damping material composition comprising 0.01 to 40 parts by weight of a crosslinking agent capable of reacting with the functional group of the vinyl compound to 100 parts by weight of the composition comprising 70 parts by weight. [Claim 2] The crosslinking agent is an epoxy compound, an amine compound, an isocyanate compound, a metal alcoholate compound,
2. The composite vibration damping material composition according to claim 1, which is a mixture of one or a combination of two or more selected from guanamine/melamine compounds, aziridyl compounds, and oxazoline compounds. 3. Claim 1, wherein the modified block copolymer obtained by modifying a block copolymer of a conjugated diene and a vinyl aromatic hydrocarbon with a vinyl compound having a functional group is a hydrogenated modified block copolymer. The composite vibration damping material composition described above.