JP2000063638A - Damping material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide damping materials showing a damping effect good in the low frequency region of several hertz or less such as an earthquake motion and low in temperature dependency. SOLUTION: This damping material is composed of a rubber composition comprising (A) an epoxidized liquid butadiene rubber, (B) a plasticizer, and (C) a curing agent, and the epoxidized liquid butadiene rubber (A) is composed of a mixture of at least two epoxidized liquid butadiene rubbers having different glass transition temperatures. Further, the component (B) is composed of bitumen, and the component (C) is composed of an amine compound or an acid anhydride.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping material used for earthquake resistance and damping of buildings.

[0002]

2. Description of the Related Art Conventionally, general vehicles, floors and walls of buildings,
Various damping materials made of polymer viscoelastic materials have been developed for the purpose of preventing vibration of machines and soundproofing of acoustic equipment.

For example, a sheet made of asphalt as a main component, which is mixed with a filler or the like to form a sheet, has been proposed as a vehicle vibration-proof sheet.

[0004]

However, such a conventionally known damping material exerts a good damping effect against vibration in a relatively high frequency range of about several tens Hz to several thousands Hz. However, the high-frequency viscoelastic material generally has the characteristic that the damping effect becomes higher as the frequency becomes higher.) However, there is a problem that the damping effect in the low frequency region of several Hz or less is insufficient. It was

For this reason, it has been difficult to apply it to applications such as viscoelastic dampers and damping walls used for seismic reinforcement of buildings and various structures, which require such characteristics. Incidentally, the vehicle damping material is used in a relatively high frequency range.

Further, there is a problem that the vibration damping effect has temperature dependency, and the vibration damping performance changes depending on the use environment. There is also a problem that mechanical properties are poor.

The present invention has been made in order to solve such a problem and shows a good vibration damping effect even in a low frequency region of several Hz or less such as seismic motion, has a small temperature dependency, and has a mechanical property. The purpose is to provide a vibration damping material having good physical properties.

[0008]

The damping material of the present invention is
(A) epoxidized liquid butadiene rubber, (B) plasticizer,
And (C) a rubber composition containing a curing agent.

The present invention will be described in detail below.

The epoxidized liquid butadiene rubber of the component (A) used in the present invention is a liquid butadiene rubber having an epoxy group in the molecule, that is, at the end of the molecular chain or inside the molecular chain. Petrochemical Poly
Examples thereof include bd R-45EPT, PB3600 manufactured by Daicel Chemical Co., Ltd., and BF1000 (trade name) manufactured by Nippon Soda Co., Ltd. These may be used singly or in a mixture of two or more, but in particular, two or more having different glass transition temperatures, preferably having a glass transition temperature of-
It is advantageous that the glass transition of the mixture can be relaxed when a combination of those in the range of 10 to 20 ° C. and those in the range of 30 to 60 ° C. is used. When two or more types are mixed and used, it is desirable that the difference in SP value is within 1.

Further, as the plasticizer of the component (B), it is desirable to use a bituminous substance such as asphalt. Other, J-
Phthalates such as (2-ethylhexyl) phthalate, phthalic acid mixed group esters, adipates such as dibutoxyethyl adipate, glycol esters such as polyglycol ether, stearates such as isooctyl / tole oil fatty acid esters, dibutoxy Sebacic acid ester such as ethoxyethyl sebacate, ester system such as phosphoric acid ester such as tricresyl phosphate,
Epoxidized soybean oil, epoxy-based such as epoxidized linseed oil, polyester-based, it is also possible to use known plasticizers such as polyether-based, mineral oil-based, vegetable oil-based,
You may use what is known as a softener for rubbers or resins, such as a synthetic type. Mineral oil-based softeners include aromatic, aromatic, naphthene-based process oils and the like, and vegetable oil-based softeners include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, palm oil. , Peanut oil, wood wax, pine oil, olive oil and the like. These may be used alone or in combination of two or more.

The blending amount of the component (B) is usually in the range of 1 to 200 parts by weight per 100 parts by weight of the epoxidized liquid butadiene rubber of the component (A).

Next, as the curing agent of the component (C), those generally known as curing agents for epoxy resins can be mentioned. Among them, amine type or acid anhydride type curing agents are preferably used. As the amine type, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, chain aliphatic polyamines such as dipropylenediamine, N-aminoethylpiperazine, mensendiamine, cyclic aliphatic polyamines such as isophoronediamine, m-xylene Examples thereof include aliphatic aromatic amines such as diamine, and aromatic amines such as metaphenylenediamine, diaminodiphenylmethane and diaminodiphenylsulfone. Further, as the acid anhydride system, phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, aromatic acid anhydrides such as benzophenone tetracarboxylic acid anhydride, maleic anhydride, cyclic aliphatic acid anhydrides such as succinic anhydride. Compounds, aliphatic acid anhydrides such as polyadipic acid anhydride and polyazelaic acid anhydride, halogenated acid anhydrides such as clendic acid anhydride and tetrabromophthalic anhydride. These may be used alone or in combination of two or more. In the present invention, the use of isophoronediamine is particularly preferable.

The compounding amount of the curing agent of the component (C) is
The equivalent ratio to the epoxidized liquid butadiene rubber as the component (A) is preferably in the range of 0.75 to 1.05. If the compounding amount of the curing agent is less than this range, the mechanical properties will deteriorate, and conversely, if it is too large, the vibration damping effect will decrease.

In the rubber composition of the present invention, in addition to the above-mentioned components, additives such as carbon black, clay, hydrocarbon resin, coumarone-indene resin, etc. usually added to this type of rubber composition are filled. Agents, anti-aging agents, pigments and the like can be added within a range that does not impair the effects of the present invention.

In the damping material of the present invention, (A) epoxidized liquid butadiene rubber, (B) plasticizer and (C)
By blending the curing agent, the damping effect in the low frequency region is improved, the temperature dependence of the damping effect is reduced, and the mechanical properties are further improved.

Therefore, the present invention can be applied to applications such as viscoelastic dampers and damping walls of buildings, which require high damping effect in the low frequency region, and can be widely used in various applications.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In the description of the following examples and comparative examples, "part" means "part by weight".

Example 1 Epoxidized liquid butadiene rubber P having a glass transition temperature of 8 ° C.
B3600 (trade name, manufactured by Daicel Chemical Industries, written as epoxidized liquid butadiene rubber A) 75 parts, epoxidized liquid butadiene rubber with a glass transition temperature of 48 ° C BF1000 (manufactured by Nippon Soda Co., Ltd.
Product name, written as epoxidized liquid butadiene rubber B) 25
Parts, 50 parts of straight asphalt 60/80 (made by Idemitsu Kosan Co., Ltd.) as a plasticizer, and 40 parts of modified aliphatic polyamine EH-220 (made by Asahi Denka Co., Ltd.) as a curing agent were uniformly mixed using a planetary mixer. Then, it was heat-cured into a predetermined shape to obtain a damping material.

Examples 2 and 3 The procedure of Example 1 was repeated, except that the amounts of the components were changed as shown in Table 1, and the mixture was uniformly mixed using a planetary mixer and then heat-cured into a predetermined shape. I got a damping material.

Comparative Example 1 100 parts of epoxidized liquid butadiene rubber A and 40 parts of EH-220 as a curing agent were uniformly mixed using a planetary mixer and then heat-cured into a predetermined shape to obtain a damping material. .

Comparative Example 2 100 parts of epoxidized liquid butadiene rubber B and 40 parts of EH-220 as a curing agent were uniformly mixed using a planetary mixer and then heat-cured into a predetermined shape to obtain a damping material. .

Comparative Example 3 50 parts of epoxidized liquid butadiene rubber B, 050 parts of epoxidized liquid butadiene rubber B, and EH-220 as a curing agent
After uniformly mixing 40 parts using a planetary mixer,
A damping material was obtained by heat-curing into a predetermined shape.

With respect to the vibration damping materials obtained in each of the above Examples and Comparative Examples, changes in tan δ (loss coefficient) and shear modulus at low frequencies when the temperature was changed in the range of −10 ° C. to 50 ° C. DMTA (Dynamic mechanical Thermal An
alyzer). The measurement is 8 mm in diameter and 2 mm in thickness
Frequency of 0.5Hz, distortion rate of 20%, heating rate of 2
It was carried out under conditions of ° C / min. Also, based on JIS K 6301,
Hardness (thickness 6mm) and elongation (23 ℃, pulling speed 500mm / m
in) was measured. The results are shown in Table 1 together with the composition. Further, FIG. 1 shows a graph of temperature dependence of tan δ based on the measurement results.

[0025]

[Table 1] As is clear from these tables and figures, the damping material according to the present invention, even with respect to low-frequency vibration, is obtained with good damping performance stably without depending on temperature,
It also has excellent mechanical properties.

[0026]

As is apparent from the above examples, according to the damping material of the present invention, the epoxidized liquid butadiene rubber is mixed with the plasticizer and the curing agent, so that the high frequency region is not only used. Also, good vibration damping performance is exhibited even in a low frequency region such as earthquake motion, and since the temperature dependence of the vibration damping performance is small, deterioration of the vibration damping performance due to the operating environment temperature is also prevented. Further, mechanical properties are also improved.

[Brief description of drawings]

FIG. 1 tan δ of damping materials obtained in Examples and Comparative Examples
The graph which shows the temperature dependence of.

Continued front page    F-term (reference) 4J002 AE05W AG00W CD16W CD18X                       CF03W CH05W EH096 EH146                       EL137 EL147 EN037 EN047                       EN077 EU137 EV217 FD010                       FD02W FD026 FD147 GL00                 4J036 AA05 AK03 AK19 DB18 DB20                       DB22 DC03 DC04 DC06 DC09                       DC10 DC39 DC44 DD05 FA09                       FA10 FA12 FB11 FB12 FB20                       FB21 JA15

Claims (4)

[Claims] 1. (A) Epoxidized liquid butadiene rubber,
A damping material comprising a rubber composition containing (B) a plasticizer and (C) a curing agent. 2. The vibration damping material according to claim 1, wherein (A)
The epoxidized liquid butadiene rubber is a vibration damping material comprising a mixture of at least two epoxidized liquid butadiene rubbers having different glass transition temperatures. 3. The vibration damping material according to claim 1, wherein the component (B) is composed of a bituminous substance. 4. The vibration damping material according to claim 1, wherein the component (C) is an amine compound or an acid anhydride.