JP3160971B2 - Composition for vibration damping and sound insulation materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
８０80 ° C.), has a high tan δ (loss tangent),
Despite its low viscosity, its own weight dripping under high temperature is small,
It is lightweight and has good vibration control, vibration proof, sound insulation, sound absorption, sound proof, regardless of cross-linked, non-cross-linked, foamed or non-foamed form.
The present invention relates to a composition for a vibration damping and sound insulating material having heat insulation properties and suitable for use in automobiles, interior materials, building materials, home appliances, and interior materials.

[0002]

2. Description of the Related Art In recent years, Japanese Unexamined Patent Publication (Kokai) No. 2-47047 discloses a damping material having a damping peak near 40 ° C. and a tan δ (loss tangent) of 2.0 or more. When this material is used on a standing surface, it sags under high temperature, causing sagging due to its own weight, impairing the appearance,
There is a problem that the workability is poor and the damping performance is inferior. Furthermore, recently, low-viscosity materials have been demanded for speeding up construction, and in particular, materials having low viscosity and low weight droop have been demanded.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been developed in the practical temperature range (-5).
(0 to 80 ° C.), and an object of the present invention is to provide a composition for a vibration damping and sound insulating material which has a low weight and low weight drop under its own weight at low temperatures and is lightweight despite its low viscosity.

[0004]

SUMMARY OF THE INVENTION The present invention relates to (a) a vinyl aromatic polymer block (A) and a conjugated diene polymer or a (co) polymer block (B) of a vinyl aromatic compound and a conjugated diene. (A)-(B)
A block copolymer or (A)-(B)-(A) block copolymer or, if necessary, a vinyl aromatic compound and a taper block (A ') in which the vinyl aromatic compound among conjugated dienes gradually increases. (A)-(B)
-(A ') block copolymer (hereinafter sometimes referred to as "block copolymer"), polybutadiene block (C) having 1,2-vinyl bond content of 20% or less, polybutadiene or vinyl aromatic compound-butadiene A block copolymer (D) having a 1,2-vinyl bond content of 25 to 95% in a butadiene portion and a block structure of C- (DC) n or (CD) m
(Where n is 1 or more and m is 2 or more), a linear or branched block copolymer (hereinafter sometimes referred to as a “block copolymer”), and a hydrogenated product thereof (hereinafter, referred to as “block copolymer”). for at least one 100 parts by weight selected from may be referred hydrogenated product "), (b) softener 50-300 parts by weight, (c) adhesive 1-300 parts by weight, and (d) silica An object of the present invention is to provide a composition for a vibration damping / sound insulation material, which contains 50 to 500 parts by weight of a filler.

The vinyl aromatic compound used in the component (a) includes styrene, t-butylstyrene, α-methylstyrene, p-methylstyrene, divinylbenzene,
1,1-diphenylstyrene, N, N-dimethyl-p-
Examples thereof include aminoethylstyrene, N, N-diethyl-p-aminoethylstyrene, and vinylpyridine, and styrene and α-methylstyrene are particularly preferable.

[0006] The conjugated diene used in the component (a) includes 1,3-butadiene, isoprene, and 2,3-butadiene.
Dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1,3-hexadiene, 4,5-diethyl-1,3-octadiene,
Examples thereof include 3-butyl-1,3-octadiene and chloroprene. In order to obtain the component (a) which is industrially usable and has excellent physical properties, 1,3-butadiene, isoprene, and 1,3-pentadiene are required. Is more preferable, and 1,3-butadiene is more preferable.

The block copolymer constituting the component (A) of the present invention is a vinyl aromatic compound polymer block (A).
(A)-(B) block copolymer or (A)-comprising a conjugated diene polymer or a (co) polymer block (B) of a vinyl aromatic compound and a conjugated diene.
(B)-(A) a block copolymer or, if necessary, a vinyl aromatic compound and a taper block (A ') in which a vinyl aromatic compound among conjugated dienes gradually increases (A)-(B). -(A ') It consists of a block copolymer. The ratio of the vinyl aromatic compound / conjugated diene in all the monomers of the block copolymer is preferably 5 to 95/95 to 5, more preferably 7 to 50/9 by weight.
3 to 50. When the content of the vinyl aromatic compound is less than 5% by weight, the compatibility with the softener is poor. For example, when an aromatic oil is blended, the vibration damping performance is inferior. on the other hand,
When the content of the vinyl aromatic compound exceeds 95% by weight,
It becomes resinous and the kneading process is inferior.

Further, the vinyl bond (1,2-, 3,4) of the conjugated diene portion in the (co) polymer block (B) of a conjugated diene polymer or a vinyl aromatic compound and a conjugated diene in the block copolymer. The content is preferably 5% or more, more preferably 20% or more, particularly preferably 30% or more. This vinyl bond content is 5
%, The vibration control and sound insulation performance is poor.

The (A)-(B) block copolymer, (A)-(B)-(A) block copolymer, or (A)-(B)-(A ') block copolymer Coalescence is represented by the following general formula via a coupling agent residue,
A block copolymer in which the polymer molecular chain is extended or branched may be used. [(A)-(B)] p-X, [(A)-(B)-
(A)] p-X or [(A)-(B)-(A ')]
pX (wherein p is an integer of 2 to 4, and X represents a coupling agent residue) Examples of the coupling agent in this case include diethyl adipate, divinylbenzene, tetrachlorosilicon, and butyltrichlorosilicon. , Tetrachlorotin, butyltrichlorotin, dimethylchlorosilicon, tetrachlorogermanium, 1,2-dibromoethane,
Examples thereof include 1,4-chloromethylbenzene, bis (trichlorosilyl) ethane, epoxidized linseed oil, tolylene diisocyanate, and 1,2,4-benzene triisocyanate.

[0010] The hydrogenated product of these block copolymers should have at least 80% of double bonds in the conjugated diene portion of the block (B) in the block copolymer.
As described above, more preferably, 95 to 100% is hydrogenated and saturated. The hydrogenated products of these block copolymers used in the present invention are described, for example, in JP-A-3-7.
No. 2512 can be obtained. The block copolymer and / or its hydrogenated product constituting the component (a) used in the present invention preferably have a number average molecular weight in terms of polystyrene of 50,000 to 600,000, more preferably 80,000 to 50,000. Within this range, excellent vibration damping / sound insulation performance and workability with a roll coater or the like are excellent.

On the other hand, the block copolymer constituting the component (a) of the present invention comprises a polybutadiene block (C) having a 1,2-vinyl bond content of 20% or less and a polybutadiene or vinyl aromatic compound-butadiene copolymer. The polymer is a block (D) in which the 1,2-vinyl bond content of the butadiene portion is 25 to 95%, and the block structure is C- (D-C) n or (C-D) m ( However, n is 1 or more and m is 2 or more). Block (C)
Is a conventional low-density polyethylene (LDP)
It becomes a crystalline block segment showing a structure similar to E). The 1,2-vinyl structure in the block (C) is usually at most 20%, preferably at most 18%, more preferably at most 15%. If the 1,2-vinyl structure of the block (C) exceeds 20%, the drop in crystal melting point after hydrogenation is remarkable, and the mechanical properties of the component (A) are unfavorable.

The block (D) is a polybutadiene or vinyl aromatic compound-butadiene copolymer, which is hydrogenated to form a rubbery ethylene-butene copolymer or vinyl aromatic compound-ethylene-butene copolymer. It becomes a block segment showing a similar structure. Here, the vinyl aromatic compound used in the block (D) is the same as the vinyl aromatic compound used in the block (A). The amount of the vinyl aromatic compound to be used is 35% by weight or less, preferably 30% by weight or less, more preferably 25% by weight or less of the monomer constituting the block (D).
If it is not more than 35% by weight, the glass transition temperature of the block (D) increases, and the mechanical properties of the component (A) are inferior. Also, block (D)
The 1,2-vinyl structure of the butadiene moiety of
When it is less than 25% or more than 95%, it shows a crystal structure derived from a polyethylene chain and a polybutene-1 chain after hydrogenation, respectively. , Resin-like properties, and the mechanical properties of the component (a) are inferior.

The ratio of the block (C) and the block (D) in the block copolymer is usually from 5 to 90% by weight of the block (C), from 95 to 10% by weight of the block (D), preferably from the block (C). ) 10-85% by weight, block (D) 90-15% by weight. When the amount of the block (C) is less than 5% by weight and the amount of the block (D) is more than 95% by weight, the crystalline block segments are insufficient, and (A)
It is not preferable because the mechanical properties of the components are inferior. The content of the block (C) exceeds 90% by weight, and the content of the block (D) is 1%.
If the amount is less than 0% by weight, the hardness of the component (a) increases,
It is not preferable because it becomes inappropriate as a thermoplastic elastomer. Further, the hydrogenated product of the block copolymer used in the present invention is obtained by hydrogenating at least 90%, preferably 95 to 100%, of the double bond of the butadiene portion of the blocks (C) and (D). If it is less than 90%, heat resistance, weather resistance and ozone resistance are inferior. The weight average molecular weight of the block (C) and the block (D) is usually 5,000 or more, preferably 10,000 or more, and more preferably 15.0 or more.
It is preferably not less than 00, and if it is less than 5,000, the mechanical properties of the component (A) are inferior, which is not preferable.

The block copolymer of the present invention can be obtained by subjecting the block (C) and the block (D) to living anionic polymerization in an organic solvent to obtain a block copolymer. It is obtained by hydrogenating this block copolymer. As the organic solvent, a hydrocarbon solvent such as pentane, hexane, heptane, octane, methylcyclopentane, cyclohexane, benzene, and xylene is used.

As the organic alkali metal compound as a polymerization initiator, an organic lithium compound is preferable. As the organic lithium compound, an organic monolithium compound, an organic dilithium compound, and an organic polylithium compound are used. Specific examples of these include ethyl lithium, n-propyl lithium, isopropyl lithium, n-butyl lithium, sec-butyl lithium, t-butyl lithium, hexamethylene dilithium, butadienyl lithium, isoprenyl dilithium and the like. And monomer 1
It is used in an amount of 0.02 to 0.2 parts by weight per 00 parts by weight.

At this time, Lewis bases such as ethers and amines, such as diethyl ether, tetrahydrofuran, propyl ether, butyl ether, higher ethers, and the like, are used as regulators of the microstructure, that is, the vinyl bond content of the conjugated diene moiety. Ether derivatives of polyethylene glycol such as ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, and triethylene glycol dimethyl ether; examples of amines include tertiary amines such as tetramethylethylene diamine, pyridine and tributylamine; Used. Further, the polymerization reaction is usually carried out at -30 ° C.
Performed at 150 ° C. Furthermore, the polymerization may be carried out at a controlled temperature or at an elevated temperature without heat removal. The block copolymer may be formed by any method. Generally, the block (C) is first polymerized in the organic solvent using a polymerization initiator such as the alkali metal compound, and then the block (D) is polymerized. Is polymerized.

The block copolymer thus obtained is a block copolymer having a polymer molecular chain extended or branched as represented by the following general formula by adding a coupling agent. Is also good. C- (DC) n (CD) m (wherein, n represents an integer of 1 or more, preferably 2 to 4, and m represents 2 or more, preferably an integer of 2 to 4). As the coupling agent in this case, the same coupling agent as that used in the block copolymer is used.
The bond content of the vinyl aromatic compound in the block copolymer is adjusted by the amount of the monomer supplied at the time of polymerization in each step, and the vinyl bond content of the conjugated diene is adjusted by changing the components of the micromodulator. Is done. further,
The weight average molecular weight is adjusted by the amount of a polymerization initiator, for example, n-butyllithium.

The method for producing the block copolymer used in the present invention will be described more specifically. First, in order to obtain the block copolymer, for example, an organolithium compound such as sec-butyllithium is used as an initiator and a vacuum is applied. Under a high-purity nitrogen stream or under a high-purity nitrogen stream, 1,3-
By polymerizing butadiene, a low vinyl polybutadiene block which becomes block (C) is polymerized, and then a micro-regulator such as tetrahydrofuran or diethyl ether and 1,3-butadiene for the second stage are added to complete the polymerization. Thereafter, a calculated amount of a coupling agent such as dimethyldichlorosilane is added, and the CD diblock polymer is coupled to obtain a triblock polymer composed of CDC.

Further, by using a polyfunctional coupling agent, a branched multiblock polymer having a plurality of CD blocks in a branch shape can be obtained. Here, at the end of the first stage, an appropriate amount of the polymerization solution is sampled and measured by gel permeation chromatography (GPC) to determine the molecular weight of the block (C).
Similarly, the second-stage molecular weight is obtained by subtracting the first-stage molecular weight from the molecular weight value obtained by GPC measurement of the sample at the end of the second-stage. Therefore,
In the case of the CDC triblock polymer, the molecular weight of the block (D) is twice the molecular weight of the second stage determined from GPC measurement.

By hydrogenating the block copolymer thus polymerized, a hydrogenated product of the block copolymer used in the present invention is obtained. The hydrogenated product of the block copolymer of the present invention is obtained by dissolving the thus obtained block copolymer in an inert solvent,
The reaction is carried out in the presence of a hydrogenation catalyst at 20 to 150 ° C. under 1 to 100 kg / cm ² of pressurized hydrogen. Inert solvents used for hydrogenation include hydrocarbon solvents such as hexane, heptane, cyclohexane, benzene, toluene and ethylbenzene, and polar solvents such as methyl ethyl ketone, ethyl acetate, ethyl ether and tetrahydrofuran.

As the hydrogenation catalyst, dicyclopentadienyl titanium halide, nickel organic carboxylate,
A hydrogenation catalyst comprising an organic nickel carbonate and an organic metal compound of Groups I to III of the Periodic Table; nickel, platinum, palladium, ruthenium, rhenium, rhodium metal catalysts supported on carbon, silica, diatomaceous earth, cobalt, Nickel, rhodium, ruthenium complex, or lithium aluminum hydride, p-toluenesulfonyl hydrazide, or Zr-Ti-Fe-V-Cr
Alloy, Zr-Ti-Nb-Fe-V-Cr alloy, LaN
such hydrogen storage alloy such as i ₅ alloys. Among these hydrogenation catalysts, a catalyst comprising an organic carboxylate of organolithium and cobalt, for example, a catalyst comprising n-butyllithium and cobalt octate is preferred. In this case, the Li / Co ratio (molar ratio) = 2.0 to 2.5 / 1 is appropriate.

The hydrogenation rate of the double bond in the butadiene portion of the hydrogenated product of the block copolymer of the present invention depends on the amount of the hydrogenation catalyst and the hydrogenated compound, or the hydrogen pressure and reaction time during the hydrogenation reaction. It is adjusted by changing. The catalyst residue is removed from the hydrogenated block copolymer solution, and a phenolic or amine-based antioxidant is added, so that the hydrogenated product can be easily isolated from the polymer solution. Isolation of the hydrogenated product of the block copolymer is performed, for example, by a method of adding acetone or alcohol to the polymer solution to cause precipitation, a method of adding the polymer solution to boiling water with stirring, and removing the solvent by distillation. It can be carried out.

Next, (b) as a softener, for example, a process oil, a lubricating oil, a petroleum softener such as paraffin, liquid paraffin, petroleum asphalt, petrolatum, or a coal tar softener such as coal tar or coal tar pitch ,
Fatty oil-based softeners such as castor oil, linseed oil, rapeseed oil and coconut oil, waxes such as tall oil, sub oil or beeswax, carnauba wax and lanolin, ricinoleic acid, palmitic acid, stearic acid, barium stearate and stear Examples include fatty acids and fatty acid salts such as calcium phosphate and zinc lanolinate, and synthetic high molecular substances such as petroleum resins. Of these, particularly preferred are process oils such as naphthenic oils and aromatic oils, and petroleum asphalt. (B) The amount of the softener is (a)
50 to 300 parts by weight, preferably 50 to 200 parts by weight, more preferably 50 to 1 part by weight, per 100 parts by weight of the component.
50 parts by weight. If the amount is less than 50 parts by weight, the effect of kneading processability cannot be sufficiently obtained, while if it exceeds 300 parts by weight, the viscosity of the composition is remarkably lowered, dripping becomes large, and
Not only does the sound insulation deteriorate, but it also hinders the processing operation and is not preferred.

Next, (c) adhesives include rosin resins, terpene resins, terpene modified resins, aliphatic / aromatic petroleum resins, cumarone / indene resins, and the like. Among these adhesives, those having a softening point of 60 ° C. or less are particularly preferred. (C) The amount of the adhesive is 1 to 300 parts by weight based on 100 parts by weight of the component (A).
Parts by weight, preferably 5 to 200 parts by weight, more preferably 10 to 180 parts by weight. If the amount is less than 1 part by weight, the effect of kneading workability cannot be sufficiently obtained, while if it exceeds 300 parts by weight, the tackiness becomes remarkable, and the workability in post-process is impaired, which is not preferable.

Next, (d) the silica-based filler is a compound containing silicon among the compounds used as the filler, for example, silicic anhydride, hydrous silicic acid, synthetic silicate, and hydrous silicic acid. Examples thereof include calcium oxide and hydrous aluminum silicate, and preferably hydrous silicic acid having a SiO ₂ content of about 70 to 95% by weight. The feature of the present invention is that the specific block copolymer and / or its hydrogenated product (a) and (d) silica-based filler are essential components, so that the viscosity is low. However, it is intended to obtain a composition of the present invention which has low weight droop, is lightweight, and has excellent vibration damping properties and sound insulation properties. (D) The amount of the silica-based filler is (a) component 10
Relative to 0 parts by weight, 50-500 parts by weight, preferably from 5
0 to 400 parts by weight, more preferably 50 to 150 parts by weight. If the amount is less than 50 parts by weight, the effect of preventing self-weight dripping is not sufficient. On the other hand, if the amount exceeds 500 parts by weight, tackiness is lost and vibration damping performance is poor. Here, the amount of self-weight dripping of the composition for vibration damping and sound insulating material of the present invention is determined by the measuring method shown in the examples,
Preferably within 100 mm, more preferably 80 mm
Within, particularly preferably within 60 mm. When the range of the amount of self-weight dripping is within this range, the composition for vibration damping and sound insulating materials of the present invention, which is more excellent, can be obtained.

The composition for vibration damping and sound insulating material of the present invention may further comprise, if necessary, other than the above-mentioned components (a) to (d), for example, light calcium carbonate, heavy calcium carbonate, and various surface-treated carbonates. In addition to calcium, talc, magnesium hydroxide
Inorganic filler such as uranium, clay, barium sulfate, titanium oxide, glass fiber, carbon fiber, cotton floc, various carbon blacks, etc. is 70 parts by weight or less, preferably 50 parts by weight, based on 100 parts by weight of the silica-based filler. Less than
You may add below, and you may add further stabilizers, such as an antioxidant and an ultraviolet absorber.

The composition for a vibration damping and sound insulating material of the present invention may contain a vulcanizing agent or a foaming agent as long as the vibration damping performance and the sound insulating performance are not reduced below a predetermined level. Other elastomers such as emulsion or solution polymerization high styrene (styrene content of 50% or more) type styrene-butadiene copolymer rubber, chloroprene rubber, acrylic rubber, halogenated butyl rubber, styrene-butadiene rubber, ethylene-propylene rubber, solution polymerization Styrene-
Butadiene rubber, 1,2-polybutadiene, ethylene-
Vinyl acetate copolymer, polybutene-1, polyethylene,
One or more of atactic polypropylene ionomers and styrene resins may be mixed.

Each component of the composition for vibration damping and sound insulating material of the present invention is mixed under heating using a hot roll, a pressure kneader, a Banbury mixer or an extruder, a planetary mixer, or the like, or a calender roll or an extruder. It can be formed into a sheet shape using a machine or into a predetermined shape using an injection molding machine.

[0029]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the present invention. In the examples, parts and% are by weight unless otherwise specified.
In the examples, the analysis of the copolymer and the evaluation of various physical properties were measured by the following methods.

Tan δ (loss tangent ) Dynamic viscoelasticity measuring device (Polymer Laboratories, P
L-DMTA) and -10 in a frequency range of 10 Hz.
The peak temperature and the peak value were measured at an ambient temperature of 0 to 100 ° C. In the evaluation, a composition having a peak at −50 to 80 ° C. and a peak value of 2.0 or more was determined to be “good”, and a composition out of this was determined to be “poor”. .

Vibration Suppression Property Compliant with JIS M329-83 5.10.
That is, on a 200 × 20 mm test plate, 170 ×
A 20 mm sample sheet was aligned in the vertical and horizontal directions, placed 30 mm apart from one end of a steel plate test piece, baked, and allowed to cool to room temperature to obtain a test piece. Here, the sample sheet is a 1.5 mm thick asphalt-based damping material / 1 mm thick present composition / 2 mm thick resin-based sheet [manufactured by Nippon Synthetic Rubber Co., Ltd., JP-A-62-2886.
No. 47] and laminated and baked on a 0.8 mm steel plate. Next, the end of the test plate on which the sample was not baked was firmly fixed to the tester, and a current of 130 to 140 Hz was passed through the electromagnetic exciter to resonate the plate, and the frequency at which the amplitude of the plate was maximized Is measured.

Next, the frequency at the point where the amplitude becomes 1 / √2 on both sides is measured, and the vibration isolation coefficient is calculated by the following equation. d = (f ₂ −f ₁ ) / f ₀ where d is the vibration isolation coefficient, and f ₀ is the frequency (H
z), f ₁ and f ₂ are frequencies (Hz) (f ₂ > f ₁ ) on both sides of the resonance point where the amplitude is 1 / √2 of the peak value of the resonance point. The evaluation was made for those which did not take a foamed form. ；: Value exceeding d = 0.4 △; d = 0.4 to 0.3 ×; d = less than 0.3

The amount of improvement in sound insulation was based on JIS A1416. That is, 400 × 5
A sample of the same size was baked on a 00 × 0.8 (mm) SPCC steel plate at 140 to 180 ° C., and then cooled to room temperature to obtain a test specimen. Here, the composition of the sample is as follows: 1.5 mm thick asphalt-based damping material / 1 mm thick composition of the present invention / 2 mm thick resin-based sheet [manufactured by Nippon Synthetic Rubber Co., Ltd., JP-A-62-288647. ] Is a laminated sheet. Next, the test specimen prepared in the above was attached to the sample mounting opening penetrating on the adjacent wall surface of the anechoic chamber on the sound source side and the anechoic chamber on the receiving side, and pink noise was generated from the sound source side to receive the noise from the sound source side. The sound pressure level difference on the side is measured, and the sound pressure level difference at this time is defined as Pi. next,
A single 0.8 mm SPCC steel plate is mounted on the sample mounting opening, pink noise is generated from the sound source side, and the sound pressure level difference between the sound source side and the sound receiving side is measured. The sound pressure level at this time is defined as Ps. The sound insulation improvement amount L (dB) is calculated by the following equation. L = Pi-Ps

The specific gravity was based on the underwater substitution method of JIS K7112. J: less than 1.1 △; 1.1 or more and less than 1.2 ×; 1.2 or more viscosity HAAKE rotational viscometer, Rotovisco RV-12,
It was measured at 160 ° C. and a shear rate of 350 mm / S ⁻¹ .

Self- weight sagging is a method in which a sample is pressed to a thickness of 0.4 mm by a press, cut into a 50 mm square sheet, attached to a vertical steel plate, and placed in a thermostat at 190 ° C.
After holding the sheet for one minute, the length of the sheet flowing down from the sheet was measured and evaluated as follows. ◎ Top: less than 60 mm ◎ Bottom: 60 mm or more, less than 80 mm ○: 80 mm or more, less than 100 mm ×: 100 mm or more

REFERENCE EXAMPLES Each component used in the formulations of the examples and comparative examples is as follows:
It is as follows. SBS; block copolymer composed of polystyrene block-polybutadiene block-polystyrene block SIS; block copolymer composed of polystyrene block-polyisoprene block-polystyrene block Norbornene rubber; NSX20B hydrogenated SBS manufactured by Zeon Corporation; polystyrene- A block copolymer obtained by hydrogenating a polybutadiene portion of a polybutadiene-polystyrene block copolymer, polyisobutylene; manufactured by Exxon Chemical Co., Ltd., Vistanex MML-140

Naphthenic oil; Fujikosan Co., Ltd.
Made, softener Tackifier; made by Yashara Chemical Co., Ltd., Clearon P
-90 Silica-based filler I; Nipsil V, manufactured by Nippon Silica Co., Ltd.
N3, SiO ₂ content of 93% or more of precipitated silica silica filler II; Tokuyama Soda Co., Tokuseal G
V, hydrous silicate heavy calcium carbonate having an SiO ₂ content of 88 to 91%; manufactured by Maruo Calcium Co., Ltd .;

Examples 1 to 9 The components having the formulations shown in Tables 1 and 2 were kneaded using a 5-liter planetary mixer, and test pieces were prepared using a press machine for each test. The results are shown in Tables 1 and 2. Examples 1 to 9 are damping, soundproofing material composition of the present invention, have been obtained aims of the present invention.

Comparative Examples 1 to 7 Test pieces were prepared in the same manner as in Example 1 using the components having the formulation shown in Table 3. Table 3 shows the results. As is clear from Table 3, Comparative Examples 1 and 2 are examples in which a polymer outside the range of the present invention was used as the component (A), and the peak value of tan δ was low, and as a result, the vibration damping property was poor. Also, its own weight droop is large. Comparative Example 3 is an example using a filler (heavy carbon super S) outside the scope of the present invention as the (d) component,
The peak value of tan δ is low, and as a result, the vibration damping property is poor,
In addition, its specific gravity is large and its own weight sags.

Comparative Example 4 is an example in which the amount of the component (b) exceeds the range of the present invention, and the viscosity of the composition was remarkably reduced, so that it could not be used as a measurement sample. Comparative Example 5
(C) This is an example in which the amount of the component is less than the range of the present invention, and
δ, the peak temperature and the peak value are all low, the vibration damping property is inferior, and the self-weight dripping is large. Comparative Example 6 is an example in which the amount of the component (c) exceeds the range of the present invention, and has a low tan δ peak value, inferior vibration damping properties, and a large weight drop. Comparative Example 7 is an example in which the amount of the component (d) exceeds the range of the present invention, and has a low tan δ peak value, poor vibration damping properties, high viscosity, and high specific gravity.

[0041]

[Table 1]

[0042]

[Table 2]

[0043]

[Table 3]

[0044]

The composition for vibration damping and sound insulating material of the present invention has a high tan δ (loss tangent) in a practical temperature range (−50 to 80 ° C.), and is extremely excellent in workability because of low viscosity. Despite its low viscosity, it has low weight drop under high temperature and is lightweight, and has good vibration damping, sound insulation, sound absorption, sound insulation and heat insulation properties regardless of cross-linked, non-cross-linked, foamed or non-foamed form. However, it is useful over a wide range of applications, such as automotive interior materials, building materials (floor lining, walls, ceiling materials, etc.), home appliances, OA equipment, interior materials, and the like, and is of great industrial value.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Minori Yamaguchi 2--11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd. (72) Yoshihisa Fujinaga 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan (56) References JP-A-63-69850 (JP, A) JP-A-2-209936 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 53 / 02 C08K 3/36 C08L 53/00 C08L 57/02

Claims (1)

(57) [Claims] 1. (A) A (A)-comprising a vinyl aromatic compound polymer block (A) and a conjugated diene polymer or a (co) polymer block (B) of a vinyl aromatic compound and a conjugated diene. (B) a block copolymer or (A)-(B)-(A) block copolymer, or, if necessary, a taper block (A) in which a vinyl aromatic compound among a vinyl aromatic compound and a conjugated diene gradually increases. (A)-(B)-(A ') block copolymer comprising polybutadiene block (C) having 1,2-vinyl bond content of 20% or less, polybutadiene or vinyl aromatic compound-butadiene copolymer A polymer having a 1,2-vinyl bond content of the butadiene moiety of 25 to
A linear structure comprising 95% of a block (D) and having a block structure represented by C- (DC) n or (CD) m (where n is 1 or more and m is 2 or more) or (B) 50 to 300 parts by weight of a softener, (c) 1 to 300 parts by weight of an adhesive, and 100 parts by weight of at least one selected from a branched block copolymer and a hydrogenated product thereof. (D) A composition for a vibration damping and sound insulating material, comprising 50 to 500 parts by weight of a silica filler.