JP2800899B2 - Rubber composition for vibration isolation - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rubber composition for vibration isolation. More specifically, the present invention relates to a low-rebound resilience halogenated butyl rubber-based rubber composition for vibration isolation having improved adhesion.

[Prior Art] and [Problems to be Solved by the Invention] Conventionally, a butyl rubber-based composition has been used as a low-rebound resilience rubber composition for vibration isolation. However, butyl rubber has a disadvantage in adhesiveness compared with general-purpose rubber,
This tendency is particularly strong in a low hardness composition.

To solve these difficulties, (a) Use of halogenated butyl rubber (b) Addition of mineral rubber and white filler, especially silica, high filling (c) Mixing of high sil, resorcinol and hexafluoro powder (HRH method), etc. However, these methods still do not sufficiently improve the adhesiveness and tend to increase the rebound resilience.

Further, it is also known to add a large amount of a plasticizer and a high reinforcing carbon in order to reduce the rebound resilience of the rubber composition. However, such a method generally has an adverse effect on the adhesion, Also reduce.

An object of the present invention is to provide an anti-vibration rubber composition capable of achieving an improvement in adhesiveness while maintaining the low rebound resilience inherent in butyl rubber.

[Means for solving the problem]

The object of the present invention is to provide 100 parts by weight of a halogenated butyl rubber, about 15 to 75 parts by weight of MAF or FEF carbon black,
Hard clay about 10-40 parts by weight and aroma oil about 5
This is achieved by a rubber composition for vibration isolation containing 15 parts by weight.

As the halogenated butyl rubber, chlorinated butyl rubber or brominated butyl rubber into which about 2 to 3% of halogen is introduced is generally used, and preferably chlorinated butyl rubber is used. As these halogenated butyl rubbers, commercially available products can be used as they are.

As the carbon black to be added, MAF grade (average particle diameter 30 to 38 mμ) or FEF grade (average particle diameter 40 to 52 m
μ) is used. HA with smaller average particle size
When F class (26-30mμ) is used, rebound resilience is good, but adhesion is remarkably reduced, while MT class (450-556mμ) with large average particle size uses rebound resilience and adhesiveness. Is seen to decrease.

MAF or FEF grade carbon black is used in an amount of about 15 to 75 parts by weight, preferably about 3 to 100 parts by weight of halogenated butyl rubber.
It is used in a ratio of 0 to 40 parts by weight. If the compounding ratio is less than this, the desired effect of improving the adhesiveness, which is the object of the present invention, cannot be obtained. On the other hand, if the compounding ratio is more than this, the effect of improving the adhesiveness cannot be obtained.

As the white filler, a hard type clay is used, and the use of calcium carbonate, silica, fine powder talc or the like lowers the adhesiveness. Hard clay is present in an amount of about 10 to 40 parts by weight, preferably about 1 to 40 parts by weight, per 100 parts by weight of halogenated butyl rubber.
It is used in a proportion of 0 to 30 parts by weight. If the compounding ratio is less than this, the effect of improving the adhesiveness is hardly observed, while if it is used in a proportion higher than this, foaming or undercuring is liable to occur.

As the petroleum oil, an aroma oil having an aniline point of about 10 to 40 ° C. is suitable.In general, paraffinic and naphthenic oils having good compatibility with butyl rubber not only increase the rebound resilience but also slightly. Significantly reduces adhesion. The aroma oil is used in an amount of about 5 to 15 parts by weight, preferably about 10 parts by weight, per 100 parts by weight of the halogenated butyl rubber. These formulations are selected in relation to adhesion.

In the composition, in addition to the above essential components, a vulcanizing agent, an acid acceptor, a lubricant, an antioxidant and other compounding agents were appropriately compounded and kneaded by a known kneading means using a kneader, a two-roll or the like. Thereafter, heat vulcanization is performed at a temperature of about 100 to 200 ° C. for about 0.5 to 120 minutes.

〔The invention's effect〕

Low rebound resilience and good adhesion by adding MAF or FEF grade carbon black to halogenated butyl rubber, similar effect by adding aroma oil as plasticizer, and addition of hard clay as white filler Thus, the composition of the present invention, which exhibits good adhesiveness and thus exhibits improved properties in combination, is used as a vibration-proof rubber composition for hard disk mounts and metal-bonded types such as clutch dampers. It can be effectively used as a molding material for vibration-proof rubber.

〔Example〕

 Next, the present invention will be described with reference to examples.

Example 1 Halogenated butyl rubber 100 parts by weight (Exxon Chemical's chlorobutyl 1066) MAF carbon black 35 (Tokai Carbon Product Seast 116, average particle size 38 mμ) Aroma oil 10 (Idemitsu Kosan Diana Process Oil AH16) Hard clay 20 (Venderbilt) Product Dixie clay) Zinc oxide (No. 3) 5 Stearic acid 1 Tetramethylthiuram disulfide accelerator 1 (Ouchi Shinko Chemical Noxeller TT) Dibenzothiazyl disulfide accelerator 1 (Our product Noxeller DM) Is kneaded in a 3 kneader at 165 ° C,
Press vulcanization was performed for 8 minutes. Vulcanized product (hardness JIS-A5
0, tensile strength 120kg / cm ² , elongation 750%), rebound resilience (JIS K-6301) and adhesiveness (JIS 90 ゜ peeling method, adherent SPCC-shot blast surface treatment, adhesive Chemlock 205-Chemlock 252) was measured.

Example 2 In Example 1, the same amount of FEF carbon black (Tokai Carbon Product Seast S0, average particle size 43 mμ) was used instead of MAF carbon black.

Comparative Examples 1-2 In Example 1, instead of MAF carbon black, the same amount of HAF carbon black (Diablack H manufactured by Mitsubishi Kasei Co., average particle size 30 mμ) or MT carbon black (Thermax MT manufactured by Cancarb) was used. Used.

The measurement results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1 below.

Examples 3 and 4 In Example 1, the amount of aroma oil was changed to 5 parts by weight or
Changed to 15 parts by weight.

Comparative Example 3 In Example 1, no aroma oil was used.

Comparative Example 4 In Example 1, the same amount of naphthenic oil (Idemitsu Kosan Diana Process Oil) was used in place of the aroma oil.
NS-24) was used.

The measurement results of Examples 3 and 4 and Comparative Examples 3 and 4 are shown in Table 2 below.

Examples 5 to 6, Comparative Examples 5 to 8 In Example 1, the amount of hard clay was changed as follows, and the measurement results as shown in Table 3 below were obtained.

Comparative Examples 9 to 11 In Example 1, instead of hard clay, the same amount of calcium carbonate (Shiraishi calcium product Whiten SB), silica (Nipsil ER manufactured by Nippon silica) or fine powder talc (Mistrone vapor manufactured by Nippon MISTRON) was used instead of the hard clay. ) Was used.

Comparative Example 12 In Example 1, no hard clay was used.

Comparative Example 13 In Example 1, hard clay and aroma oil were not used.

 The measurement results of Comparative Examples 9 to 13 are shown in Table 4 below.

Claims (1)

(57) [Claims] (1) 100 parts by weight of halogenated butyl rubber, 15 to 75 parts by weight of MAF or FEF carbon black, 10 parts of hard clay
1 to 40 parts by weight and 5 to 15 parts by weight of aroma oil.