JPH061904A - Vibration-deadening material composition - Google Patents

Abstract

PURPOSE:To obtain a composition suitable for automobiles, household electric appliances, having high vibration damping properties by blending an ethylenic copolymer with a hydrocarbon resin, a petroleum-based resin, etc. CONSTITUTION:(A) 100 pts.wt. ethylenic copolymer is blended with (B) 100-300 pts.wt. resinous substance having 90-120 deg.C softening point obtained by blending a hydrocarbon resin having 115-145 deg.C softening point with a resin selected from an aliphatic petroleum resin, an aromatic petroleum resin, an aliphatic aromatic copolymer-based petroleum resin, a terpene-based resin and a coumarone-based resin having 50-100 deg.C softening point obtained by polymerizing 100 pts.wt. raw material oil having 60-90% indene content prepared from distillate having 140-220 deg.C boiling point among cracked petroleum distillate of cracking of petroleums in the presence of 4-10 pts.wt. phenolic compound by using a Friedel- Crafts catalyst.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping material having improved vibration damping performance, and can be widely used in fields for suppressing vibration, such as automobiles, building materials and home appliances.

[0002]

2. Description of the Related Art Conventionally, it has been proposed to use an ethylene-based copolymer as a binding material for a damping material for the purpose of improving moldability or reducing weight (Japanese Patent Laid-Open No. 52-977).
02, JP-A-54-110256, JP-A-61-222.
972, JP-A-63-295669). Further, it has been proposed to add petroleum resin or the like as a tackifying resin in order to improve the adhesion of the vibration damping material containing these ethylene-based copolymers to the metal plate (JP-A-64-38).
446, JP-A-2-209936). However, almost no studies have been made so far on the effect of improving the vibration damping property when these tackifying resins are blended.

On the other hand, in applications where these damping materials are used, especially in vehicle applications, further weight reduction is being promoted, so that higher performance damping materials are desired, but as shown above. In addition, the conventional proposal cannot obtain sufficient performance.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a damping material having high damping performance.

[0005]

Therefore, the present inventor has paid attention to the effect of improving the damping property of thermoplastic resins such as petroleum resin and natural resin, which have been conventionally used only as tackifiers. As a result of intensive studies on a damping material having a vibration performance, the present invention has been completed by finding that a specific composition satisfies it.

That is, according to the present invention, (A) 100 parts by weight of an ethylene-based copolymer and (B) (a) a cracked oil fraction obtained by thermal decomposition of petroleum, having a boiling point range of 140 to 220 ° C. 100 parts by weight of a feedstock oil having an indene content of 60 to 90% obtained by distilling a fraction having
A hydrocarbon resin having a softening point of 115 to 145 ° C. obtained by polymerization using a Friedel-Crafts type catalyst in the presence of parts by weight;
(B) One selected from aliphatic petroleum resins having a softening point of 50 to 100 ° C., aromatic petroleum resins, aliphatic aromatic copolymer petroleum resins, rosin resins, terpene resins, and coumarone resins. Alternatively, the present invention relates to a damping material composition comprising 100 to 300 parts by weight of a resinous material having a softening point of 90 to 120 ° C., which is obtained by mixing two or more kinds of resins. Hereinafter, the present invention will be described in detail.

The hydrocarbon resin (a) used in the present invention is obtained by distilling a fraction having a boiling point range of 140 to 220 ° C. among cracked oil fractions obtained by thermal decomposition of petroleum. , 100 parts by weight of feedstock oil having an indene content of 60 to 90%, and a phenol compound of 4.0 to 10.0
It is an aromatic petroleum resin having a softening point of 115 to 145 ° C. obtained by polymerization using a Friedel-Crafts type catalyst in the presence of parts by weight.

Here, the Friedel-Crafts type catalyst is preferably a complex catalyst using boron trifluoride ethyl ether, phenol, butyl ether, butyl alcohol, methyl alcohol or the like.

Of the cracked oil fractions obtained by the thermal cracking of petroleum, those having a boiling point range of 140 to 220 ° C. are styrene, α-methylstyrene, β-methylstyrene, vinyltoluene, indene and diene. Cyclopentadiene, ethylbenzene, trimethylbenzene, naphthalene, etc. are included. Of these, styrene, α-methylstyrene, β-methylstyrene, vinyltoluene, and indene are the polymerizable components, and the indene content is defined by the following formula. Indene content (%) = (B / A) × 100 A; Polymerizable component content (wt%) B; Indene content (wt%) The content of each component is the value analyzed by the gas chromatography method. is there.

Examples of the phenol compound include phenol and alkyl-substituted phenols such as cresol and xylenol. The addition amount of the phenol compound of the present invention does not include the addition amount of phenol or the like added as a part of the Friedel-Crafts type catalyst.

(B) Softening point 5 used in the present invention
Examples of the resin at 0 to 100 ° C. include aliphatic petroleum resin, aromatic petroleum resin, aliphatic aromatic copolymer petroleum resin, rosin resin, terpene resin, and coumarone resin.

Examples of the rosin resin include rosin, rosin ester, hydrogenated rosin, hydrogenated rosin ester and polymerized rosin. Examples of the terpene resin include synthetic terpene resin and terpene phenol resin.

The ethylene-based copolymer (A) used in the present invention is ethylene-methyl acrylate, ethylene-ethyl acrylate, ethylene-vinyl acetate copolymer and the like, and particularly ethylene-vinyl acetate copolymer. Coalescence is preferred. The ethylene-vinyl acetate copolymer preferably has a vinyl acetate content of 25 to 50 parts by weight, which is a melt index (MI) used as a measure of the molecular weight.
(190 ℃, weighted 2160g, measured at 10 minutes) is 1
It is preferably 0 to 400 g / 10 minutes.

The hydrocarbon resin (a) used in the present invention and the softening point (b) used in the present invention are from 50 to 50.
The resinous material (B) obtained by mixing with a resin at 100 ° C. preferably has a softening point of 90 to 120 ° C., more preferably 100 ° C.
It is ~ 115 ° C. If the softening point is lower than 90 ° C, the peak temperature of the vibration damping performance will be low, which is not suitable. Also,
When the softening point is higher than 120 ° C., the peak temperature of the vibration damping performance becomes high, which is not suitable.

Further, the (a) hydrocarbon resin used in the present invention and the (b) softening point 5 used in the present invention.
The (B) resinous material obtained by mixing a resin at 0 to 100 ° C. is mixed with (A) and (B) in advance and then kneaded with the (A) ethylene-based copolymer used in the present invention. However, the order and means are not limited. For example, (a) and (A)
And (B) were prepared in advance and then further kneaded, or either (A) or (B) and (A) were kneaded. Examples include a method of kneading the other of the latter (a) and (b).

Further, an inorganic filler may be added to improve the vibration damping performance of the vibration damping composition of the present invention. Examples thereof include mica, titanium oxide, carbon black and the like.

[0017]

EXAMPLES Examples will be shown below, but these are examples and the present invention is not limited to these examples unless it deviates from the gist thereof.

The test method was as follows. Test method (1) Softening point JIS K-2207 (2) Viscoelasticity measurement The vibration damping performance was evaluated by viscoelasticity measurement. In general,
When the damping material is used in the unrestrained type, the damping performance improves as the loss elastic modulus (E ″) increases, and in the restricted type as the loss tangent (tan δ) increases, A composition exhibiting a high loss elastic modulus (E ″) or a high loss tangent (tan δ) was judged to have high vibration damping performance. Model: Orientec Co., Ltd., Leo Vibron DD
V-III-EP conditions: Measured at a heating rate of 2 ° C./min and a frequency of 35 Hz.

Example 1 140 out of cracked oil fractions obtained by thermal cracking of petroleum
5 parts by weight of phenol was added to 100 parts by weight of a fraction having an indene content adjusted to 85% obtained by distilling a fraction having a boiling range of 220 to 220 ° C. After 6 wt% was added and the mixture was polymerized at 30 ° C. for 3 hours, the catalyst was removed with an aqueous solution of caustic soda, followed by washing with water to remove unreacted oil and low-polymerization products to obtain a resin (A). The softening point of the resin (A) was 130 ° C. The resin (A) thus obtained was melt-kneaded with an equal amount of an aliphatic aromatic copolymer petroleum resin (PETROTAC 70 manufactured by Tosoh Corporation) having a softening point of 70 ° C. to obtain a softening point of 1
A resinous material (B) having a temperature of 02 ° C. was obtained.

The resinous material (B) 2 thus obtained
00 parts by weight, 100 parts by weight of ethylene-vinyl acetate copolymer (vinyl acetate content 32%, MI 60), and 50 parts by weight of mica (60C manufactured by Kuraray) were melt-kneaded to prepare and evaluate a damping material composition. The results are shown in Table 1 and FIGS. 1 and 2.

Example 2 To 80 parts by weight of the resin (A) obtained in the same manner as in Example 1, an aliphatic-aromatic copolymer petroleum resin having a softening point of 89 ° C. (PETROTAC 90 manufactured by Tosoh Corporation) 120 Part by weight was melt-kneaded to obtain a resinous material (C) having a softening point of 105 ° C. 200 parts by weight of the resinous material (C) thus obtained, 100 parts by weight of ethylene-vinyl acetate copolymer (vinyl acetate content 32%, MI 60), and 50 parts by weight of mica (Kuraray 60C) are melted. The results of evaluation by kneading to prepare a vibration damping composition are shown in Table 1, FIG. 1 and FIG.

Comparative Example 1 Aliphatic petroleum resin (ESCOREZ manufactured by Tonex Co., Ltd.)
1310 softening point 93 ° C.) (D) 100 parts by weight, ethylene-vinyl acetate copolymer (vinyl acetate content 32%,
MI 60) 100 parts by weight, mica (Kuraray 60C)
50 parts by weight were melt-kneaded to prepare a vibration damping composition, and the evaluation results are shown in Table 1, FIG. 1 and FIG.

Comparative Example 2 Terpene resin (TO-105 manufactured by Yasuhara Chemical Co., Ltd.
Softening point 100 ° C.) (E) 200 parts by weight, ethylene-vinyl acetate copolymer (vinyl acetate content 32%, MI 6
0) 100 parts by weight and 50 parts by weight of mica (60C manufactured by Kuraray) were melt-kneaded to prepare a damping material composition, and the evaluation results are shown in Table 1, FIG. 1 and FIG.

[0024]

[Table 1]

[0025]

Industrial Applicability As described above, the damping material composition of the present invention exhibits excellent damping performance and can be widely used in fields for damping control such as automobiles, building materials and home appliances.

[Brief description of drawings]

FIG. 1 is a graph showing loss elastic moduli of compositions obtained in Examples and Comparative Examples.

FIG. 2 is a graph showing loss tangents of compositions obtained in Examples and Comparative Examples.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location C08L 93/04 LSK 7415-4J F16F 15/02 Q 9138-3J

Claims (1)

[Claims] 1. (A) 100 parts by weight of an ethylene copolymer and (B) (a) a cracked oil fraction obtained by thermal decomposition of petroleum, which has a boiling point range of 140 to 220 ° C. 100 parts by weight of a feedstock oil having an indene content of 60 to 90% obtained by distillation was added to a phenol compound of 4.0 to 10.
A hydrocarbon resin having a softening point of 115 to 145 ° C. obtained by polymerization using a Friedel-Crafts type catalyst in the presence of 0 part by weight, and (b) an aliphatic petroleum resin having a softening point of 50 to 100 ° C.
A softening point of 90-by mixing with one or more resins selected from aromatic petroleum resins, aliphatic aromatic copolymer petroleum resins, rosin resins, terpene resins and coumarone resins. A damping material composition comprising 100 to 300 parts by weight of a resinous material at 120 ° C.