JPH0489849A - Vibration-damping and sound-insulating material composition - Google Patents

Abstract

PURPOSE:To obtain the title composition excellent in vibration-damping, sound- insulating, sound-absorbing and heat-insulating properties by mixing a specified elastomer with a softener and a self-adhesive to prepare a composition of a specified loss tangent. CONSTITUTION:100 pts.wt. at least one elastomer having a number-average molecular weight of 600000 or above (e.g. polyisobutylene) is mixed with 1-2000 pts.wt. softener (e.g. naphthenic oil) and 1-2000 pts.wt. self-adhesive (e.g. Clearon P-90, a product of Yasuhara Oil and Fat Co.) to obtain a composition having a peak temperature of a tangent loss (tandelta) at 10Hz of -50 to 80 deg.C and a peak value of 2.0 or above.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Fields] The present invention is applicable to industrial applications in the practical temperature range (-50 to 80°C).
It provides a material with a high tan δ (loss tangent), in other words, a material that absorbs energy applied from the outside (large energy loss), and can be in any form: crosslinked, non-crosslinked, foamed, or non-foamed It has good vibration damping, anti-vibration, sound insulation, sound absorption, sound insulation, and heat insulation properties regardless of the vehicle,
The present invention relates to a composition for vibration damping and sound insulation materials suitable for interior materials, building materials, and home appliance interior materials.

[Prior Art] Compositions based on medium to high repulsion rubber (such as butadiene rubber) having rubber elasticity can be made to match the appearance and form of the composition of the present invention, but these compositions cause energy loss, which is completely contrary to the present invention. Due to the small amount of material used, it is easy for sound and vibration to propagate, so it cannot be used for this purpose.

On the other hand, general-purpose resins (PE, PP, etc.), high-hardness resins (PS
, ABS, nylon, etc.) exhibit almost no energy loss in the practical temperature range of the present invention, easily propagate sound and vibration, and cannot be used for the purpose concerned.

Additionally, some thermoplastic elastomer (urethane, etc.) compositions, which are located between rubber and plastic, exhibit some energy loss and absorb sound and vibration, albeit slightly. It has a low ability that is incomparable to other compositions and has no practical use.

[Problems to be Solved by the Invention] As a result of intensive research into compositions that have excellent vibration damping, sound insulation, and properties for use in automobile interior materials, building materials, and home appliance interior materials, the present inventors have found that The present invention was developed based on a search for a damping material composition having good damping properties.

[Means for Solving the Problems] That is, the present invention provides 100 parts by weight of at least one type of elastomer (A) having a number average molecular weight of 600,000 or more, and 1 to 10 parts by weight of the softener (B). 200
0 parts by weight and 1 to 2000 parts by weight of adhesive (C), and the peak temperature of tan δ (loss tangent) at 10 Hz is in the range of 150 to 80°C, and the peak value is 2.
The object of the present invention is to provide a vibration-damping and sound-insulating composition characterized in that it has a coefficient of 0 or more.

Examples of the component (A) used in the present invention include natural rubber, imprene rubber, high CIS butadiene rubber, acrylonitrile butadiene rubber, butyl rubber, norbornene rubber, and polyisobutylene. Preferred elastomers include isoprene rubber, butyl rubber, norbornene rubber, and polyisobutylene, with butyl rubber and polyisobutylene being particularly preferred.

The number average molecular weight of component (A) is 600.000 or more, preferably soo, ooo or more. Number average molecular weight is 60
If it is less than 0.000, the ability to envelop components (B) and (C) will be poor. For this reason, the kneading processability is poor, and sufficient amounts of components (B) and (C) cannot be added, resulting in poor vibration damping and sound insulation properties.

Examples of the softening agent (B) include process oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt,
Petroleum-based softeners such as vaseline, coal tar-based softeners such as coal tar and coal tar pitch, fatty oil-based softeners such as castor oil, linseed oil, rapeseed oil, and coconut oil, tall oil, sub-oil, and beeswax, Carnauba wax, waxes such as lanolin, ricinoleic acid, palmitic acid, stearic acid, baium stearate, calcium stearate,
Examples include fatty acids and fatty acid salts such as zinc lanophosphate, and synthetic polymeric substances such as petroleum resins. Among these, particularly preferred are process oils such as naphthenic oils and aromatic oils, and petroleum asphalt.

The blending amount of the softener (B) is 1 to 2000 parts by weight, preferably 200 to 1 part by weight, per 100 parts by weight of component (A).
The amount is 700 parts by weight, more preferably 350 to 1500 parts by weight, particularly preferably 500 to 1000 parts by weight. In order to sufficiently obtain the effect of kneading processability, 1 part by weight or more is required. If it exceeds 2000 parts by weight, the vibration damping and sound insulation properties will deteriorate and the viscosity of the composition will drop significantly, which will impede processing operations, which is not preferable.

Examples of the adhesive component (C) include rosin resins, terpene resins, terpene modified resins, aliphatic/aromatic petroleum resins, coumaron indene resins, and the like. Among these, those having a softening point of 60° C. or higher are particularly preferred.

The blending amount of the adhesive component (C) is 1 to 2000 parts by weight, preferably 200 to 1 part by weight, per 100 parts by weight of component (A).
The amount is 500 parts by weight, more preferably 350 to 1200 parts by weight, particularly preferably 400 to 1000 parts by weight. In order to sufficiently obtain the effect of kneading processability, 1 part by weight or more is required. If it exceeds 2,000 parts by weight, tackiness becomes significant and processing workability and post-process workability are impaired, which is not preferable.

Furthermore, in addition to the above-mentioned substances, the vibration damping material composition of the present invention may optionally contain inorganic fillers such as calcium carbonate, talc, clay, silica, mica, and carbon black, as well as antioxidants and ultraviolet absorbers. Stabilizers may also be added.

Further, the vibration damping material composition of the present invention may contain a vulcanizing agent or a foaming agent, as long as it does not reduce the damping performance below a predetermined level, and may also contain other elastomers, such as emulsified or solution polymerized elastomers. High styrene (ST50% or more) type styrene-butadiene copolymer rubber, chloroprene rubber, acrylic rubber, halogenated butyl rubber, styrene-butadiene rubber, ethylene-propylene rubber, solution polymerized styrene-butadiene rubber, 1,2-polybutadiene, aromatic One or more of vinyl compound-conjugated diene block copolymers, ethylene-vinyl acetate copolymers, polybutene 1, polyethylene, atactic polypropylene ionomers, styrene resins, etc. may be mixed.

In addition, the blended compositions of (A), (B), and (C) above are l
The peak temperature of tan δ (loss tangent) of OH2 is 150~
80°C, preferably 0 to 70°C, more preferably 10
-60°C, and has a peak value of 2.0 or more, preferably 2.5 or more, and more preferably 3-7.

Each component of the damping material composition of the present invention is mixed under heat using a heat roll, a pressure kneader-Banbury mixer-1 extruder, a planetary mixer, etc., and is then mixed using a calender roll or an extruder. It can be molded into a desired shape using an injection molding machine.

[Examples] Hereinafter, the present invention will be specifically explained using Examples, but the scope of the present invention is not limited by the Examples.

In Examples and Comparative Examples, tan δ (loss tangent) was measured using a dynamic viscoelasticity measuring device (PL-DMTA).

The peak temperature and peak value were measured at an ambient temperature of -100 to 100[deg.] C. in the 1OH2 frequency range. The evaluation was conducted on compositions that had a peak between -50 and 80°C and a peak value of 2°C or more.
Good: It was judged as ○, and compositions that deviated from this were judged as [Poor: ×].

The vibration damping properties were based on JIS M329-83 5.10 vibration damping properties.

That is, on a 200X20mm test plate, 170X
A 20mm sample sheet*1) was aligned vertically and horizontally, and 30mm was inserted from one end of the test plate made of steel plate. After baking the test pieces after placing them at a distance of 1 mm, the test pieces were left to cool to room temperature.

Material) The sample sheet is 1.5 thick asphalt vibration damping material/1
A laminated sheet of a+m thick composition of the present invention/2 mm thick resin sheet (manufactured by Japan Synthetic Rubber Co., Ltd., in accordance with JP-A-62-288647) was laminated and baked on a 0°8 mm steel plate.

Next, the end of the test plate on which the sample is not baked is firmly fixed in the tester and kept at 40°C in a constant temperature bath. A current of 130 to 140 Hz is applied to the electromagnetic exciter to cause the plate to resonate, and the frequency at which the next amplitude reaches its maximum is measured. Next, the frequency at the point where the amplitude becomes 1/FΣ on both sides is measured.

Calculate the vibration isolation coefficient using the following formula.

Here, d: Anti-vibration coefficient fo: Frequency at the resonance point Hz fl, f2: Frequency at which the amplitude on both sides of the resonance point is 1/I'Σ of the peak value at the resonance point Hzf2>fl (Evaluation) 0: d = 0.4 or more △: d = 0.4 to 0.3
The cohesiveness of the compound during kneading with a planetary mixer was evaluated, and compositions with good cohesiveness were rated as ``◎'', those that were somewhat good were rated as [○], and those that were poor were rated as [x].

Example 1.2.5.6 (A) component butyl rubber, polyisobutylene (Vistanex MML-14Q, manufactured by Exxon Chemical), (B) component naphthenic oil, (C) component Clearon (P-9)
0, cheap crude oil), Niscrone (G-90, made by Nippon Steel Chemical Co., Ltd.), and other compounding agents were kneaded into 5 using a planetary mixer in the proportions shown in Table 1, and the mixture was adjusted to a predetermined thickness using a press. , obtained the sample. The test results are shown in Table-1.

Example 3.4 Component (A) polyisobutylene (Vistanex MML
-14Q, manufactured by Exxon Chemical), norbornene rubber (NS
X2OB, manufactured by Nippon Zeon), (B) component naphthenic oil, (C) component Clearon (P-90, manufactured by Yasushi Oil), and other compounding agents in the proportions shown in Table 1.
The mixture was kneaded using a °C kneader and adjusted to a predetermined thickness using a press to obtain a sample. The test results are shown in Table-1.

Comparative Examples 1 to 6 Comparative Examples 1 to 6 were carried out in the same manner as in Example 1 except that the types and amounts of each component were changed. The results are shown in Table-2.

In Comparative Example 1, the amount of adhesive exceeds the scope of the claims of the present invention, and it has drawbacks in tan δ peak value and vibration damping coefficient.

In Comparative Example 2, the amount of softener exceeded the range claimed in the present invention, and therefore it could not be processed using a kneader or a planetary mixer, and a uniform composition could not be obtained.

It can be seen that in Comparative Example 3, the amount of adhesive was less than the claimed range of the present invention, the tan δ peak temperature was low, and the vibration damping coefficient and crosstalk processability were poor.

In Comparative Examples 4.5.6, the average molecular weight of the elastomer is less than the claimed range of the present invention, and these are all ta
The nδ peak value and vibration damping coefficient are not satisfied.

As shown in Table 1 above, the composition of the example satisfies both the kneading processability and the peak temperature and peak value of tan δ (loss tangent), and has excellent physical properties, whereas the comparative example is a composition that has excellent physical properties. It has some drawbacks and is not satisfactory.

Margins below [Effects of the Invention] The composition of the present invention has an excellent ability to absorb energy applied from the outside in the practical temperature range (-50 to 80°C), and has crosslinked, non-crosslinked, foamed, and non-foamed forms. It has good vibration damping, sound insulation, sound absorption, soundproofing, and heat insulation properties, and can be used as automobile interior materials, building materials (floor lining, walls, ceiling materials, etc.), home appliances,
A: It can be used in a wide range of applications, such as equipment interior materials, and has extremely high industrial value.

Patent applicant: Japan Synthetic Rubber Co., Ltd.

Claims (1)

[Claims] (A) 100 parts by weight of at least one type of elastomer having a number average molecular weight of 600,000 or more, 1 to 2000 parts by weight of the softener (B), and 1 to 200 parts by weight of the adhesive (C).
0 parts by weight, and the peak temperature of tan δ (loss tangent) at 10 Hz is in the range of -50 to 80 °C,
A vibration damping and sound insulating material composition characterized in that its peak value is 2.0 or more.