JP3180384B2 - Vibration energy absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in various fields of transportation equipment, precision electronic equipment, acoustic equipment, and the like to improve the operation response speed, measurement accuracy, and sound quality by controlling vibration. It relates to an excellent vibration energy absorbing material.

[0002]

2. Description of the Related Art Conventionally, butyl rubber is most often used as a vibration energy absorbing material. Also, recently, polynorbornene and special urethane-based elastomers have been found to have higher performance and have attracted attention.

[0003] The primary evaluation of these vibration energy-absorbing materials is based on storage elastic modulus (E ') and loss coefficient (tan δ = loss elastic modulus (E ") / obtained by measuring the viscoelasticity of the material.
(Storage modulus (E ')).

[0004] In order to design as a vibration energy absorbing material, there is an optimum value as the loss coefficient increases and the storage elastic modulus depends on the form used.

[0005] These two factors are usually highly temperature dependent. That is, the storage elastic modulus gradually decreases as the temperature increases, and sharply decreases from a temperature range usually exceeding the glass transition point. Further, the loss coefficient shows the highest value in a temperature range exceeding the glass transition point, but generally tends to decrease in a temperature range around the glass transition point.

Therefore, as a standard conventionally required for such a vibration energy absorbing material, first, it has to have a high loss coefficient in a temperature range where the material is used.

On the other hand, the storage elastic modulus can be adjusted to an optimum value by adding an inorganic or metal filler, a softening agent, rubber, or the like, so that the value can be adjusted within a considerable range. . Therefore, butyl rubber, polynorbornene, special urethane-based elastomers, and the like have a maximum loss coefficient of tan δ = 1.4, 2..
It shows an excellent value of 8,1.3. However, these materials have difficulties in workability and formability, and their use range is limited.

[0008] Further, polyvinyl chloride resin has a long history as one of the five major general-purpose resins, and most molding methods have been established in addition to economic efficiency. In addition, it is advantageous in that it is an amorphous resin, and that it can be easily compounded with an inorganic / metal filler or a softener. The loss factor of polyvinyl chloride alone has a peak value of about 1.1 at around 90 ° C. However, when 100 parts by weight of DOP, which is a typical plasticizer, is added to 100 parts by weight of the resin, the peak temperature of the loss coefficient becomes about 5 ° C., and the peak value becomes about 0.7. Will drop.

[0009] This value is too low compared to the rubber elastomers described above. For this reason, a thermoplastic resin having excellent processability and economic efficiency with a high loss coefficient is being demanded.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide an excellent vibration energy absorbing material while making use of the characteristics of polyvinyl chloride resin.

[0011]

Means for Solving the Problems In view of the above situation, the present inventors have conducted intensive studies and as a result have completed the present invention.

That is, the present invention relates to a condensed polycyclic compound comprising three or more rings and / or a ring assembly comprising three or more ring systems per 100 parts by weight of a polyvinyl chloride resin.
The present invention relates to a vibration energy absorbing material comprising a polyvinyl chloride resin composition containing from 100 to 100 parts by weight.

[0013]

[0014]

[0015]

The details will be described below.

The polyvinyl chloride resin used in the present invention includes vinyl chloride homopolymer resin, chlorinated vinyl chloride resin,
A vinyl chloride copolymer resin obtained by random copolymerization or block copolymerization with one or more of all monomers copolymerizable with the vinyl chloride monomer (for example, vinyl acetate-vinyl chloride copolymer, ethylene- Vinyl chloride copolymer)
And a single resin or a mixture of two or more of the above resins.

The condensed polycyclic compound used in the present invention is a condensed polycyclic hydrocarbon or a condensed heterocyclic compound composed of three or more rings. There is no problem with any configuration as long as it has three or more rings, but it is particularly preferable that the number of rings is large.

On the other hand, the ring assembly used in the present invention includes three or more ring systems (single or condensed rings) directly bonded by a single bond or a double bond, and includes the number of such direct ring bonds. Means one less than the number of ring systems present. The ring system may be a cyclic hydrocarbon system or a heterocyclic system.
Although there is no problem with any configuration as long as it has three or more ring systems, it is particularly preferable to have many ring systems.

These condensed polycyclic compounds and ring assemblies (hereinafter collectively referred to as cyclic products) include those having 1 to 4 carbon atoms among the alkyl groups, hydroxyl, oxo, carboxyl,
A functional group such as an amino group, a cyano group, a nitro group, or a halogen group may be bonded to the ring.

Further, since the cyclic substance is compounded with the polyvinyl chloride resin, it is necessary to bring the compound into a sufficiently dispersed state. Therefore, the melting point of the cyclic material is desirably lower than the processing temperature of the polyvinyl chloride resin. For example, condensed polycyclic compounds include acenaphthylene, acenaphthene, phenanthrene, 9-phenanthrole, fluorene, anthrone, 9-fluorenone, per-hydrofluorene, benzophenanthrene, 9-anthracene methanol,
9,10-dihydroanthracene, pyrene, 1,2-benzopyrene, dibenzophenanthrene, dibenzosuberane, terpene composed of three or more rings, steroid, alkaloid, dibenzofuran, xanthene, 9-xanthenol, xanthone, acridine, dibenzothiophene,
Examples thereof include phenanthridine, 1,4-benzoquinone, 7,8-benzoquinoline, 1,10-phenanthroline, phenazine, phenoxazine, and thianthrene.
As ring assemblies, 1,2-diphenylbenzene, 1,3
-Diphenylbenzene, 1,3,5-triphenylbenzene, 1,2,3,4-tetraphenyl-1,3-cyclopentadiene, 2,2: 6 ′, 2 ″ -terpyridine and the like.

One of these cyclic materials or a mixture of two or more thereof is compounded with a polyvinyl chloride resin.

The total amount of the cyclic substance is 5 to 100 parts by weight, and more than 15 to 50 parts by weight, based on 100 parts by weight of the polyvinyl chloride resin, from the viewpoint of processability and economy. Parts or less is desirable.

In the case of polyvinyl chloride alone, the frequency is 10H
When the dynamic viscoelasticity is measured at z, the maximum value of tan δ is 1.1 at about 90 ° C., but the maximum value of tan δ is 1 at a temperature of about 20 ° C. to 85 ° C. depending on the amount of addition in this range. .2
About 2.5. This phenomenon is understood from the theory of relaxation phenomena that the state inside the material has become more uniform and the distribution of relaxation times has been narrowed, but it is unknown why such specific cyclic substances are specifically superior. It is.

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

The polyvinyl chloride resin composition constituting the vibration energy absorbing material according to the present invention may contain DOP, dioctyl sebacate (DOS), etc. which are usually added to the polyvinyl chloride resin to such an extent that the performance is not extremely reduced. Plasticizers, inorganic fillers such as calcium carbonate, talc, etc., flame retardants such as antimony trioxide and zinc borate, and flake-like fillers often used for vibration energy absorbers such as mica and graphite And the like can be added as needed.

If necessary, it can be blended with NBR (acrylonitrile-butadiene rubber), EVA (ethylene-vinyl acetate copolymer), acrylic resin and the like which are usually used for modifying polyvinyl chloride resin. Further, it can be blended with a coumarone resin, a xylene resin, or the like often used as a vibration energy absorbing material.

The vibration energy absorbing material according to the present invention can be freely formed by a conventional method such as calendering, extrusion, injection molding, foam molding, compression molding or the like, which is a method of molding polyvinyl chloride resin.

The vibration energy obtained by the present invention
Absorbents are used for supporting members of equipment such as precision electronic equipment and precision measuring equipment, etc., whose accuracy may be affected by vibration, fixing members such as packing and gaskets, laminated members and chassis of audio equipment, etc. it can. It is also used to control vibration by attaching it directly to highly vibrating parts such as automobiles and industrial equipment.It is also used on the legs of precision equipment to prevent vibration transmission from the floor. It can be used in combination with other materials such as a metal material such as an aluminum plate, wood, an inorganic material, and the like.

[0036]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to these examples.

Example 1 Ethylene-vinyl chloride copolymer (Rulon E-280)
0, manufactured by Tosoh Corporation), 20 parts by weight of phenanthrene as a condensed polycyclic compound, and OG- as a stabilizer.
756 (manufactured by Mizusawa Chemical Co., Ltd.), 5 parts by weight, antimony trioxide (ATOX-S, manufactured by Nippon Seiko Co., Ltd.) as a flame retardant
7 parts by weight were mixed and roll-kneaded at a temperature of 170 ° C. for 5 minutes to obtain a target composition.

Example 2 In Example 1, pyrene 20 was used instead of phenanthrene.
Mix exactly the same system except using parts by weight,
Roll kneading was performed at 0 ° C. for 5 minutes to obtain a desired composition.

Example 3 The same system as in Example 1 was used except that 20 parts by weight of fluorene was used instead of phenanthrene, and the mixture was roll-kneaded at a temperature of 170 ° C. for 5 minutes to obtain a target composition. .

Example 4 The same system as in Example 1 was used except that 20 parts by weight of anthrone were used instead of phenanthrene, and the mixture was roll-kneaded at a temperature of 170 ° C. for 5 minutes to obtain a target composition. .

Example 5 The same system as in Example 1 was used except that 20 parts by weight of dibenzofuran was used instead of phenanthrene.
Roll kneading was performed at a temperature of 160 ° C. for 5 minutes to obtain a target composition.

Example 6 The same system as in Example 1 was used except that the amount of phenanthrene was changed to 80 parts by weight, followed by roll kneading at a temperature of 170 ° C. for 5 minutes to obtain a target composition.

Comparative Example 1 The same system as in Example 1 was used except that 20 parts by weight of 2-methylnaphthalene, which is a condensed polycyclic compound having two rings, was used instead of phenanthrene. The mixture was roll-kneaded for 5 minutes to obtain the desired composition.

Comparative Example 2 In Example 1, decalin 2 was used instead of phenanthrene.
Mix exactly the same system except using 0 parts by weight,
Roll kneading was performed at 60 ° C. for 5 minutes to obtain a target composition.

Example 7 Except for using 20 parts by weight of 1,2-diphenylbenzene as a ring assembly in place of phenanthrene in Example 1, the same system was mixed and roll kneading was performed at a temperature of 170 ° C. for 5 minutes. Thus, the desired composition was obtained.

Example 8 In Example 1, 1,3,5 was used instead of phenanthrene.
-Except for using 20 parts by weight of triphenylbenzene, exactly the same system was mixed and roll-kneaded at a temperature of 170 ° C for 5 minutes to obtain a target composition.

Example 9 The same system as in Example 7 was used except that 1,2-diphenylbenzene was used in an amount of 80 parts by weight.
The mixture was roll-kneaded for 5 minutes to obtain the desired composition. Comparative Example 3 The same system as in Example 1 was used except that 20 parts by weight of biphenyl, which is a ring assembly composed of two rings, was used in place of phenanthrene.
To obtain the desired composition.

Comparative Example 4 The same system as in Example 1 was used except that 20 parts by weight of p-hydroxybiphenyl was used instead of phenanthrene, and the mixture was roll-kneaded at a temperature of 170 ° C. for 5 minutes to obtain the desired composition. I got

[0049]

[0050]

[0051]

[0052]

[0053]

[0054]

[Table 1]

[0055]

As is apparent from the above description, according to the present invention, a condensed polycyclic compound comprising a polyvinyl chloride resin and three or more rings, and / or a ring comprising three or more ring systems. By compounding the set at a specific ratio, a vibrational energy absorber having a high loss factor is obtained.

[0056]

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C08L 27/06

Claims (1)

(57) [Claims] 1 to 5 parts by weight of a condensed polycyclic compound composed of three or more rings and / or a ring assembly composed of three or more ring systems per 100 parts by weight of a polyvinyl chloride resin. Vibration energy absorbing material made of polyvinyl chloride resin composition.