JPH07102171A - Composition for vehicle vibration-damping sheet - Google Patents

Abstract

PURPOSE:To obtain a vehicle vibration-damping composition excellent in storage stability, also excellent in chipping resistance and vibration-damping nature after firmly bonded to metal coated surface on heating, by dispersing a specific urethane resin at high concentrations in a bituminous substance using a specific dispersant. CONSTITUTION:This composition comprising (A) a bituminous substance, (B) a polydiene chain-contg. blocked urethane prepolymer (pref. blocked with an oxime compound and/or a lactam), (C) organic polyamine compound (S) (pref. at least one kind selected from alicyclic diamines and polyoxypropylene polyamines), and (D) an alkylphenol [pref. (mono-, di- or tri-1-18C alkyl)phenol], and pref. furthermore, (E) a thermally decomposable foaming agent and (F) a blocking agent dissociation catalyst.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for a vehicle vibration damping sheet, which has excellent storage stability of a coating material, is strongly adhered to a metal coating surface by heating, and is excellent in chipping resistance and vibration damping property. is there.

[0002]

2. Description of the Related Art Conventionally, as a composition for a vehicle vibration damping sheet of a bituminous material type, a composition comprising a bituminous material and an inorganic filler as main components and a thermosetting resin and a foaming agent (for example, JP-B-4-44899), a composition comprising a hydroxyl group-containing liquid diene polymer, a polyisocyanate compound and a bituminous material (for example, JP-B-4-46225) and the like are known.

[0003]

However, the conventional composition has insufficient adhesion to a metal-coated surface and chipping resistance, and the composition has a problem in storage stability.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors disperse a specific urethane resin in a bituminous substance at a high concentration using a specific dispersant, The inventors have found that a composition for a vehicle vibration damping sheet, which has excellent storage stability and is firmly adhered to a metal-coated surface by heating and has excellent chipping resistance and vibration damping property, has been accomplished, and has reached the present invention.

That is, the present invention relates to a bituminous material (A), a polydiene chain-containing blocked urethane prepolymer (B),
A composition for a vehicle vibration damping sheet, which comprises an organic polyamine compound (C) and an alkylphenol (D).

As (A) in the present invention, those usually used for this purpose can be used. Specific examples of the (A) include petroleum asphalt such as straight asphalt, blown asphalt, semi-blown asphalt, propane (solvent) deasphalting asphalt, petroleum pitch, coal tar, and modified products thereof. Of these, particularly preferred is a saturated content of 4 in the composition analysis method described in the "Asphalt Pocket Book" issued by the Japan Asphalt Association.
0-60% by weight, aromatic content 30-50% by weight, resin 1
It is a bituminous material having a composition of 0 wt% or less and asphaltene 5 wt% or less. The amount of (A) used is (A) to (D)
It is usually 10 to 60% by weight, preferably 20 to 50% by weight, based on the total total weight of When the amount of (A) used is less than 10% by weight, the viscosity of the composition for vehicle vibration-damping sheet becomes high and the coating workability deteriorates, and when it exceeds 60% by weight, the vibration-damping property deteriorates.

(B) in the present invention is a polydiene chain-containing urethane prepolymer (B1) and a blocking agent (B).
It is a block body from 2). Examples of the diisocyanate constituting (B1) include aromatic diisocyanate, aliphatic diisocyanate and alicyclic diisocyanate, and examples of the aromatic diisocyanate include tolylene diisocyanate (TDI), α, α, α ′, α′-tetramethylxylyl. Diisocyanate (TMXDI), diphenylmethane diisocyanate (MDI), naphthylene diisocyanate (NDI), xylylene diisocyanate (XDI), etc .; As aliphatic diisocyanate, hexamethylene diisocyanate (HDI), trimethylhexamethylene diisocyanate (TMDI), lysine diisocyanate (TDI) LDI) etc .; as cycloaliphatic diisocyanates, dicyclohexylmethane diisocyanate (HMDI), isophorone diisocyanate (IP
I), 1,4-cyclohexane diisocyanate (CH
DI), hydrogenated xylene diisocyanate (HXDI),
Hydrogenated tolylene diisocyanate (HTDI) and the like; and mixtures of two or more thereof. Preferred of these are TDI, HDI, HMDI and IP
DI, especially preferred are TDI, HMDI and IPDI.

As other polyisocyanates, modified products of araliphatic, aliphatic, alicyclic or aromatic polyisocyanate compounds can also be used. As a modified product of the polyisocyanate compound, a part or all of the isocyanate groups of the compounds exemplified above are modified to a carbodiimide group, a uretdione group, a uretoimine group, a buret group, an isocyanurate group or the like and two or more of these compounds. A mixture of Preferred of these are burette-modified and isocyanurate-modified polyisocyanates derived from TDI, HDI, HMDI and IPDI.

The polydiene chain-containing polyol constituting (B1) is a polybutadiene homopolymer having a hydroxyl group at the molecular end, a polyisoprene homopolymer, a butadiene-styrene copolymer, a butadiene-isoprene copolymer, a butadiene-acrylonitrile copolymer, a butadiene-2-. Examples thereof include ethylhexyl acrylate copolymer and butadiene-n-octadecyl acrylate copolymer. Particularly preferred among these are polybutadiene polyols. Also, (B
As 1), other known polyols (polyether polyol, polyester polyol, polymer polyol, polycarbonate polyol, polylactone polyol, polyolefin polyol, etc.) can be used in combination with the above polydiene chain-containing polyol.

The reaction temperature for forming the urethane prepolymer is usually 50 to 100 ° C. In the reaction of the urethane prepolymer, a known urethane polymerization catalyst (such as dibutyltin dilaurate) can be added to accelerate the reaction.

Examples of (B2) used to obtain (B) in the present invention include alkylphenol compounds [monoalkylphenol compounds (cresol, ethylphenol, n-propylphenol, n-butylphenol, n-octylphenol, n-nonylphenol). ,
Isopropylphenol, tert-butylphenol, sec-butylphenol, 2-ethylhexylphenol, etc., dialkylphenol compounds (xylenol, di-n-propylphenol, di-n-butylphenol, dioctylphenol, dinonylphenol, diisopropylphenol, di-tert- Butylphenol, di-sec-butylphenol, di-2-
Ethylhexylphenol, etc., trialkylphenol compounds (trimethylphenol, triethylphenol, etc.)]; Styrenated phenol compounds; Allyl compounds [Allyl alcohol compounds (allyl alcohol, allylcarbinol, etc.); Allyl ether compounds (ethylene glycol monoallyl ether, diethylene glycol) Monoallyl ether, glycerin monoallyl ether, glycerin diallyl ether, trimethylolpropane monoallyl ether, trimethylolpropane diallyl ether, pentaerythritol triallyl ether, diglycerol diallyl ether, etc .; Allylphenol compounds (allylphenol, 2-allyl- 6-
Methylphenol, etc.)], oxime compounds (acetoxime, methylethylketoxime, methylisobutylketoxime, etc.), lactams (ε-caprolactam, etc.), active methylene compounds [malonic acid diesters (diethyl malonate, etc.), acetylacetone, acetoacetic ester (Ethyl acetoacetate etc.), mercaptans (butyl mercaptan, hexyl mercaptan etc.), acid amides (acetanilide, acrylic amide, dimer acid amide etc.), imidazoles (imidazole, 2-ethylimidazole etc.), acid imides (Succinimide, phthalimide, etc.); and a mixture of two or more thereof. Of these, particularly preferred are oxime compounds and lactams, and particularly preferred are methyl ethyl ketoxime and ε-caprolactam. As the blocking agent which is excellent in storage stability and obtains sufficient physical properties after the heat treatment, one having a dissociation temperature for regenerating an isocyanate group in the range of usually 80 to 140 ° C. is preferable.

The amount of (B2) added is usually 1 to 2 equivalents, preferably 1.05 to 1.5 equivalents, relative to 1 equivalent of the free isocyanate group of (B1) which is the precursor of (B). .
The reaction temperature for blocking is usually 50 to 100 ° C. In the blocking reaction, a known urethane polymerization catalyst (such as dibutyltin dilaurate) can be added to accelerate the reaction.

Examples of the organic polyamine compound (C) in the present invention include polyethylene polyamines (ethylenediamine, diethylenetriamine, etc.); aromatic polyamines (xylylenediamine, 4,4'-diaminodiphenylmethane, etc.), aliphatic polyamines (hexamethylenediamine). Etc.); alicyclic polyamine (4,4′-diaminodicyclohexylmethane, isophoronediamine, 1,
4-diaminocyclohexane, hydrogenated xylylenediamine, hydrogenated tolylenediamine, 3,3′-dimethyl-4,
4'-diaminodicyclohexylmethane, 3,3'-dichloro-4,4'-diaminodicyclohexylmethane,
Isopropylidene dicyclohexyl-4,4'-diamine and the like); polyoxyalkylene diamine [polyoxypropylene diamine (for example, "Jeffamine D-230", "Jeffamine D-40" manufactured by Texaco Chemical Co., Ltd.
0 "and the like)]; polyoxyalkylene triamine {ethyl tris [aminopoly (isopropyloxymethyl)]
Methane (for example, "Jeffermin T-403" manufactured by Texaco Chemical Co., Ltd.), etc .; and a mixture of two or more thereof. Of these, particularly preferred are isophoronediamine and 3,3′-dimethyl-4,4 ′.
-Diaminodicyclohexylmethane, 3,3'-dichloro-4,4'-diaminodicyclohexylmethane, polyoxypropylenediamine and "Jeffamine T-
403 ". The amount of (C) used is 0.9 to 1.1 equivalents, preferably 0.98 to 1.02 equivalents, relative to 1 equivalent of the regenerated isocyanate group of (B).

The amount of (B) + (C) used in the present invention is usually 20 to 6 based on the total weight of (A) to (D).
It is 0% by weight, preferably 20 to 50% by weight. (B)
If the amount of + (C) used is less than 20% by weight, the vibration damping property becomes insufficient, and if it exceeds 60% by weight, the viscosity of the composition increases and the coating workability deteriorates.

Alkylphenol (D) in the present invention
Functions as a dispersant for dispersing (B) and (C) in (A). Examples of the (D) include alkylphenol compounds [monoalkylphenol compounds (cresol, ethylphenol, n-propylphenol, n-
Butylphenol, n-octylphenol, n-nonylphenol, isopropylphenol, tert-butylphenol, sec-butylphenol, 2-ethylhexylphenol, etc., dialkylphenol compounds (xylenol, di-n-propylphenol, di-n-butylphenol, dioctylphenol, Dinonylphenol, diisopropylphenol, di-te
rt-butylphenol, di-sec-butylphenol, di-2-ethylhexylphenol, etc.), trialkylphenol compounds (trimethylphenol, triethylphenol, etc.)]; styrenated phenol compounds, etc .; and mixtures of two or more thereof. Particularly preferred among these are n-nonylphenol, tert-butylphenol and 3,5-
It is xylenol.

Further, an alkylene oxide adduct derived from (D) can also be used. As alkylene oxide, ethylene oxide, propylene oxide,
Butylene oxide, tetrahydrofuran, styrene oxide, epichlorohydrin and mixtures of two or more thereof. The molecular weight per hydroxyl group of the alkylene oxide adduct of (D) is usually 1000 or less, preferably 700 or less. Addition reaction temperature is usually 80-1
It is 50 ° C. In the addition reaction, a known polymerization catalyst (such as sodium methylate) can be added to accelerate the addition reaction. The amount of (D) used is (A) to (D)
It is usually 1 to 15% by weight, preferably 1 to 10% by weight, based on the total weight of When the amount of (D) used is less than 1% by weight, the dispersion of (B) and (C) with respect to (A) becomes insufficient, and when it exceeds 15% by weight, the vibration damping property is deteriorated.

The composition of the present invention may contain a heat decomposition type foaming agent (E) in order to impart foam moldability. Examples of the (E) include azobisformamide, azobisisobutyronitrile, 2,2'-azobis- (2,4
-Dimethylvaleronitrile), azoazobenzene, diazoaminobenzene, azodicarbonamide, and other azo compounds; (paratoluenesulfonylacetonehydrazone, N, N'-dimethyl-N, N'-dinitroso-terephthalamide, N, N '-Dinitrosopentamethylenetetramine, etc.) N-nitroso compound; [benzenesulfonyl hydrazide, paratoluenesulfonyl hydrazide, 4,4'-oxybis (benzenesulfonyl hydrazide), 4-4'-diphenylmethanesulfonyl hydrazide, etc. ] Sulfonyl hydrazide compound and the like; and a mixture of two or more thereof. Of these, preferred are 4,4'-oxybis (benzenesulfonyl hydrazide) and azodicarbonamide. The amount of (E) used is not particularly limited, but is usually 0 with respect to the total weight of (A) to (D).
-5% by weight, preferably 1-4% by weight.

The composition for a vehicle vibration damping sheet of the present invention can be adhered to a metal coated surface at a lower baking temperature by using a blocking agent dissociation catalyst (F) in combination. Examples of (F) include potassium or sodium salts of alkylphosphonic acid; metal salts of fatty acids having 8 to 20 carbon atoms such as sodium, potassium, nickel, cobalt, cadmium, barium, calcium and zinc;
Organotin compounds such as dibutyltin dilaurate, dioctyltin maleate, dibutyldibutoxytin, bis (2-ethylhexyl) tin oxide, 1,1,3,3-tetrabutyl-1,3-diacetoxydistannoxane; and these Mixtures of two or more may be mentioned. Particularly preferred among these are dibutyltin dilaurate and dioctyltin maleate. The amount of (F) used is usually 0 to 5% by weight based on the total weight of (A) to (D),
It is preferably 0.1 to 3% by weight.

The composition for vehicle vibration damping sheet of the present invention may optionally contain a plasticizer (G). Examples of the (G) include phthalic acid esters such as diethyl phthalate, dibutyl phthalate, dioctyl phthalate, dilauryl phthalate, distearyl phthalate and diisononyl phthalate; adipic acid esters such as dioctyl adipate; sebacic acid esters such as dioctyl sebacate; Phosphate esters such as rufusofate; ester type plasticizers such as 2,2,4-trimethyl 1,3-pentanediol diisobutyrate; and mixtures of two or more thereof. Particularly preferred among these are dioctyl phthalate and diisononyl phthalate. The amount of (G) used is not particularly limited, but is 40% by weight or less, preferably 30% by weight or less based on the total amount of (A) to (D).

In addition to the above-mentioned components (A) to (G), various other additives (for example, fillers) can be added to the composition for vehicle vibration-damping sheet of the present invention, if necessary. As a filler, an inorganic filler (calcium carbonate, talc, diatomaceous earth,
Kaolin, etc.) and organic fillers (cellulose powder, powdered rubber, recycled rubber, etc.) and the like.

The amount of the filler used as an additive is not particularly limited, but is usually 0 to 70% by weight, preferably 10 to 60% by weight based on the total amount of (A) to (D).
Is.

In the composition for a vehicle vibration damping sheet of the present invention, the content of each component is not particularly limited, but an example of the formulation is as follows. Usually preferably bituminous material (A) 10 to 60% by weight (20 to 50% by weight) blocked urethane prepolymer + organic polyamine compound (B) + (C) 20 to 60% by weight (20 to 50% by weight) alkylphenol ( D) 1 to 15% by weight (1 to 10% by weight) Thermal decomposition type foaming agent (E) 0 to 5% by weight (1 to 4% by weight) Blocking agent dissociation catalyst (F) 0 to 5% by weight (0.1 ~ 3 wt%) Plasticizer (G) 0-40 wt% (1-30 wt%) Filler 0-70 wt% (10-60 wt%)

The composition for a vehicle vibration damping sheet of the present invention can be produced by using a commonly used dispersion kneader, and the mixing method and mixing conditions of each component are not particularly limited.

The composition for a vehicle vibration damping sheet of the present invention can be applied to various metal substrates and various undercoating surfaces applied to metal (especially steel) surfaces, and particularly to cationic type electrodeposition coating surfaces. . The amount of the composition for vehicle vibration damping sheet applied to the coated surface is usually 500 to 3000 g /
m ² and the coating film thickness is usually 0.2 to ² mm. Examples of the coating method include brush coating, roller coating, airless spray coating and the like. In addition, heat treatment is performed after coating, and the temperature in that case is usually 110 to 160 ° C, preferably 120 to 140 ° C, and the time is usually 20 to 4 ° C.
0 minutes. Alternatively, a molded vibration damping sheet having a film thickness of 1 mm to 10 mm may be prepared in advance, and the vibration damping sheet may be attached to a portion of the vehicle where vibration damping is required.

[0025]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In the following, "part" means part by weight and "%" means% by weight.

Production Example 1 [Production of Blocked Urethane Prepomer (B-)] 1 L capacity 4 equipped with a stirrer, thermometer and nitrogen introducing tube
Polybutadiene polyol "R-15H"
T "(manufactured by Idemitsu Petrochemical, hydroxyl content 1.83 meq /
g) 567 parts, isophorone diisocyanate 237 parts and dibutyltin dilaurate 1 part were charged and reacted at 90 ° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer having an NCO content of 5.5%. Subsequently, 96 parts of methyl ethyl ketoxime was added and reacted at 60 ° C. for 1 hour to obtain 900 parts of blocked urethane polymer (B-).

Production Example 2 [Production of Blocked Urethane Prepomer (B-)] Using the same reactor as in Production Example 1, polybutadiene polyol "R-45HT" (manufactured by Idemitsu Petrochemical Co., Ltd., hydroxyl group content: 0. 83 meq / g) 605 parts, polyether polyol "Sannickstriol TP-400" (manufactured by Sanyo Chemical Industries, molecular weight 430) 46 parts, disirohexyl methane diisocyanate 185 parts and dibutyltin dilaurate 1 part were charged, and under a nitrogen stream 95 Reaction was carried out at 0 ° C. for 5 hours to obtain a urethane prepolymer having an NCO content of 3.5%. Subsequently, 64 parts of methyl ethyl ketoxime was added to 60
The reaction was carried out at 0 ° C for 1 hour to obtain 900 parts of a blocked urethane polymer (B-).

Production Example 3 [Production of Blocked Urethane Prepomer (B-)] Using the same reactor as in Production Example 1, 635 parts of polybutadiene polyol "R-45HT" and polyether polyol "Sannickstriol TP" were used. -400 "49
Parts, "Coronate T-80" (manufactured by Nippon Polyurethane Industry Co., Ltd., 2,4- and 2,6-tolylene diisocyanate (80/20) mixture, NCO content 48%) 129 parts and dibudibutyltin dilaurate 1 part, The reaction was carried out at 80 ° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer having an NCO content of 3.8%. Subsequently, 87 parts of ε-caprolactam was added and reacted at 90 ° C for 4 hours to obtain 900 parts of a blocked urethane prepolymer (B-).

Comparative Production Example 1 [Production of Comparative Blocked Urethane Prepomer (B-)] Using the same reactor as in Production Example 1, the polyether polyol "Sannix diol PP-2000" (Sanyo Kasei Co., Ltd.) was used. Made, molecular weight 2000) 274 parts, polyether polyol "Sannix Triol GP-3000"
(Sanyo Chemical Co., Ltd., molecular weight 3000) 411 parts, isophorone diisocyanate 152 parts and dibutyltin dilaurate 1 part were charged and reacted at 90 ° C. for 5 hours under a nitrogen stream to obtain a urethane prepolymer having an NCO content of 3.4%. Subsequently, 63 parts of methyl ethyl ketoxime was added to 60
The reaction was carried out at 0 ° C for 1 hour to obtain 900 parts of a comparative blocked urethane polymer (B-).

Example 1 Bituminous product "FR-LA" was added to a 5L planetary mixer.
(Fuji Kosan Co., Ltd.) 1000 parts and n-nonylphenol 5
After 0 part was charged and kneaded uniformly at room temperature, 900 parts of (B-) obtained in Production Example 1, 89 parts of isophoronediamine and 100 parts of DOP were added and further kneaded at room temperature. Subsequently, 1200 parts of "NCC-110" (manufactured by Nippon Koka Kogyo Co., Ltd., calcium carbonate) were charged in portions and kneaded, and then 33 parts of dibutyltin dilaurate and 27 parts of 4,4'-oxybis (benzenesulfonylhydrazide) were added. Kneading,
Vacuum degassing was performed to prepare a composition for vehicle vibration damping sheet. The initial viscosity of the composition for vehicle vibration damping sheet is 300 PS / 25 ° C.
And the viscosity after storage at 40 ° C. for 10 days is 350 PS /
It was 25 ° C. When the coating composition was applied to a steel sheet coated with cationic electrodeposition to a coating thickness of 0.5 mm and heat-treated at 140 ° C. for 30 minutes, the expansion ratio was 2.8. A sheet was obtained, the adhesion to the surface of the cationic electrodeposition coating was extremely good, and no rust was observed after the chipping resistance test piece was dipped in a salt water for 3 days by a gravelometer. Furthermore, the adhesiveness did not change at all even after immersion in 40 ° C. warm water for 10 days. The loss factor of the sheet, which shows the damping property of the sheet, is 2m.
m sheet was 0.35 at 20 ° C and 0.15 at 60 ° C. The results of these performance evaluations are shown in Table 1.

Example 2 In Example 1, the same amount of (B-) obtained in Production Example 2 was used in place of (B-), and an ethylene oxide 2 mol adduct of n-nonylphenol was used instead of n-nonylphenol. A vehicle damping sheet composition was obtained in the same manner as in Example 1 except that the same amount was used and 83 parts of 3,3′-dimethyl-4,4′-diaminodicyclohexylmethane was used instead of 89 parts of isophoronediamine. . The performance evaluation results of this product are shown in Table 1.

Example 3 In Example 1, the same amount of (B-) obtained in Production Example 3 was used instead of (B-), and 114 parts of "Jeffamine T-403" was used instead of 89 parts of isophoronediamine. A vehicle vibration damping composition was obtained in the same manner as in Example 1 except that 4,4'-oxybis (benzenesulfonylhydrazide) was not used. The performance evaluation results of this product are shown in Table 1.

Comparative Example 1 Comparative Example 1 in place of (B-) in Example 1
Using the same amount of (B-) obtained in 1., isophorone diamine 89
A comparative vehicle damping sheet composition was obtained in the same manner as in Example 1 except that 60 parts were used. The results of performance evaluation of this product are also shown in Table 1.

Comparative Example 2 A comparative vehicle vibration damping composition was obtained in the same manner as in Example 1 except that n-nonylphenol was not used. The results of performance evaluation of this product are also shown in Table 1.

The performance evaluation items and evaluation methods in Table 1 are as follows. Initial viscosity: Viscosity immediately after paint preparation (BH type viscometer, PS /
Viscosity after storage: Viscosity after storage at 40 ° C for 10 days after preparation of paint (BH type viscometer, PS / 25 ° C) Adhesion: Adhesion to cationic type electrodeposition coated steel sheet after baking at 140 ° C for 30 minutes Property (Cutter knife peeling) Water-resistant adhesion: 140 ° C x 30 minutes after baking, and adhesion to cationic type electrodeposition coated steel sheet after immersion in 40 ° C warm water for 10 days (cutter knife peeling) Tensile shear strength: 140 ° C x 30 Tensile shear strength after partial baking (Kg / cm ² , conforming to JIS K 6850) Shear fracture state: CF; Cohesive fracture, AF; Interfacial peeling Chipping resistance: Gravelo method (step stone No. 6 crushed stone, stepping stone amount 5)
00gr × 5, pressure 5Kg / cm ² , angle 45 °, panel temperature -30 ° C) 3 pieces of chipping resistance test piece in salt water
The number of rust points after immersion in the sun. Damping property: The loss factor is 2.0 based on the resonance method "Handbook for Noise Control (published by Japan Society for Acoustic Materials), page 438".
Measured at ~ 2.5 mm. Generally, this loss coefficient is 0.
If it is 05 or more, it is said to have a damping effect. Foaming ratio: Each sheet with or without the addition of a heat-decomposable foaming agent was prepared and calculated from the volume difference.

[0036]

[Table 1]

[0037]

The composition for a vehicle vibration damping sheet of the present invention has the following effects. (1) Usually, although it is effective to use a foam material in order to reduce the weight of a vehicle, the anti-chipping property, which shows the vehicle performance, and the imparting of vibration damping property are contradictory, but the composition of the present invention is It satisfies both the chipping property and the vibration damping property. (2) Conventionally, vinyl chloride resin-based plastisol compositions, felts, etc. have been used as body sealers, undercoat materials, and vibration damping materials for automobile bodies, but the present invention is a bituminous substance that is a by-product generated during petroleum refining. Is expected to be effective in the effective use of chemical by-products and the prevention of global environmental pollution due to acid rain derived from vinyl chloride resin. From the above effects, the composition for a vehicle vibration damping sheet of the present invention is extremely useful as a material for a vibration damping material of a car body, particularly a cationic electrodeposition coating in the automobile industry, a body sealer and an undercoat material. It is useful.

Claims (8)

[Claims] 1. A composition for a vehicle vibration damping sheet, comprising a bituminous material (A), a polydiene chain-containing blocked urethane prepolymer (B), an organic polyamine compound (C) and an alkylphenol (D). 2. The composition according to claim 1, wherein the blocking agent (B) is blocked with an oxime compound and / or a lactam. 3. The composition according to claim 1, wherein (C) is at least one selected from the group consisting of alicyclic diamines and polyoxypropylene polyamines. 4. The composition according to claim 1, wherein (D) is a mono-, di- or trialkyl (C 1-18) phenol. 5. Based on the total weight of (A) to (D), (A) is 10 to 60% by weight, and (B) + (C) is 20.
% To 60% by weight, and (D) is 1 to 15% by weight.
[4] The composition according to any one of [4] to [4]. 6. The composition according to any one of claims 1 to 5, which further contains a thermal decomposition type foaming agent (E). 7. The composition according to claim 1, further comprising a blocking agent dissociation catalyst (F). 8. The composition according to claim 1, which is used as a coating type or a preformed foamed vibration damping sheet for vehicles.