KR100475948B1 - A insulator composition of the good dynamic property and heat resistance durability - Google Patents

Abstract

The present invention relates to a dustproof rubber composition having excellent dynamic properties and heat resistance, and more particularly, to a dustproof rubber composition composed of a polymer, a filler, an anti-aging agent, a vulcanizing agent, and the like, instead of conventional natural rubber, isoprene rubber and polybutadiene. The present invention relates to a dustproof rubber composition having improved rubber properties and heat aging fatigue resistance by adjusting rubber to a ratio, adjusting sulfur to accelerator used as a vulcanizing agent, and using tetrabutylthiuram disulfide (TBTD) as an accelerator.

Description

Anti-vibration rubber composition with excellent dynamic properties and heat-resistant durability {A INSULATOR COMPOSITION OF THE GOOD DYNAMIC PROPERTY AND HEAT RESISTANCE DURABILITY}

The present invention relates to a dustproof rubber composition having excellent dynamic properties and heat resistance, and more particularly, to a dustproof rubber composition composed of a polymer, a filler, an anti-aging agent, a vulcanizing agent, and the like, instead of conventional natural rubber, isoprene rubber and polybutadiene. The present invention relates to a dustproof rubber composition having improved rubber properties and heat aging fatigue resistance by adjusting rubber to a ratio, adjusting sulfur to accelerator used as a vulcanizing agent, and using tetrabutylthiuram disulfide (TBTD) as an accelerator.

It is divided into anti-vibration rubbers used in automobiles, namely engine mount insulators and bush insulators, and many studies have been conducted as important functional parts in automobiles mainly for engine support and vibration isolation.

Anti-vibration rubber is a part whose use and function depend on the shape design, material design and evaluation criteria. The main material has many limitations as a rubber material.

In particular, the rubber used for the anti-vibration rubber uses natural rubber as the main raw material, and has a function of supporting and anti-vibration by using fillers and additives to impart viscoelasticity and processability. Since the weakness of the anti-vibration rubber is used for a long time due to the fatigue fatigue and the surrounding environment due to the displacement-load, the deterioration of durability and characteristics due to aging is a subject of continuous research.

Anti-vibration rubber has the disadvantage of considering the opposing characteristics of satisfying vibration insulation and durability at the same time. For example, if the durability is improved, the vibration insulation is deteriorated due to the problem of higher dynamic magnification, especially the dynamic spring constant. Properties), the durability is lowered, there is an opposite property that the practicality lacks.

Therefore, in the field of anti-vibration rubber, the problem of simultaneously satisfying the reduction of copper magnification (copper spring characteristics), heat resistance and durability is to be studied.

Therefore, the present inventors have studied to overcome the problems of the prior art for the solid-type anti-vibration rubber, using a certain ratio of isoprene rubber and polybutadiene rubber instead of the existing natural rubber, adjust the magnification of sulfur and accelerators, By using TBTD as an accelerator, the present invention was completed by developing a dustproof rubber composition having excellent low copper magnification and heat resistance, which improved dynamic characteristics and heat aging fatigue.

therefore. The present invention is to provide a dustproof rubber composition with the same magnification and heat resistance improved at the same time.

The present invention provides a dustproof rubber composition composed of 100 parts by weight of polymer, 30 to 45 parts by weight of filler, 3 to 7 parts by weight of anti-aging agent, and 2 to 5 parts by weight of vulcanizing agent, wherein the polymer has a weight ratio of isoprene rubber and polybutadiene rubber of 70 to 70 parts by weight. 80: 20 to 30, wherein the vulcanizing agent is characterized in that the dust-proof rubber composition consisting of 1 to 1.5: 0.5 to 1 by weight ratio of sulfur and accelerator.

The accelerator also includes a composition that is tetrabutylthiuram difulfide (TBTD).

Referring to the present invention in more detail as follows.

The present invention relates to a dustproof rubber composition comprising a polymer, a filler, an anti-aging agent, a vulcanizing agent, and the like, in which a predetermined ratio of isoprene rubber (IR) and polybutadiene rubber (BR) is used as a vulcanizing agent, instead of conventional natural rubber. The present invention relates to an anti-vibration rubber composition in which the ratio of sulfur and accelerators is adjusted, and TBTD (tetrabutylthiuram disulfide) is used as an accelerator to improve dynamic characteristics and heat aging fatigue resistance to heat.

While the polymer is 100 parts by weight of natural rubber, the present invention uses a certain ratio of isoprene rubber (IR) and polybutadiene rubber (BR) polymer blend. When the ratio of IR: BR is 70 to 80:20 to 30 (weight ratio), the ratio of BR is less than 20% based on IR in the above formulation, and the reduction of the copper spring constant is lowered. There is a problem of poor durability.

On the other hand, as the filler, it is generally preferred to use carbon black, zinc oxide, magnesium oxide, and the like, and the content thereof is preferably 30 to 45 parts by weight based on 100 parts by weight of the polymer. Departing from this, there is a problem of decreasing the static and copper spring constant and durability due to the deterioration of rubber properties.

In addition, anti-aging agents are also generally used phenylene diamine (3C, KUMANOX13), dihydroquinoline (RD), wax (SUNNOC-N) and the like, the content thereof is 3 to 100 parts by weight of the polymer 7 parts by weight is preferred. Outside of this, there is a problem of premature failure regardless of the rubber properties and operating conditions during use.

In addition, the ratio of sulfur and accelerator using sulfur (SULFUR) and an accelerator as a vulcanizing agent is preferably 1 to 1.5: 0.5 to 1 (weight ratio), and particularly the heat resistance of the vulcanized rubber by using the tetrabutylthiuram disulfide (TBTD) as an accelerator. It is improved, and the effect of reducing the dynamic spring constant is large by supplementing the elastic force of rubber. At this time, if the accelerator ratio is less than 0.5, the delay of vulcanization time and heat resistance are low, and if the accelerator ratio is greater than 1, room temperature durability is low and there is a problem that adversely affects the reduction of the copper spring constant.

Therefore, the present invention improves heat aging fatigue resistance to dynamic properties and heat by using a certain ratio of isoprene rubber and polybutadiene rubber as a polymer, adjusting the ratio of sulfur and accelerator as a vulcanizing agent, and using TBTD as accelerator. As a low vibration magnification and excellent heat resistance rubber composition, it will be usefully used in automobiles, ships, and the like.

Hereinafter, the present invention will be described in more detail based on the test examples, but the present invention is not limited to the following examples.

Test Example

Examples 1 and 2 and Comparative Examples 1 and 2 were manufactured to the anti-dust rubber (INSULATOR) with the composition shown in Table 1 in the engine and chassis field to measure the following physical properties.

[Property evaluation method]

1. Constant Spring Constant (Ks) Evaluation

The standard test period was 90 ± 15 kgf and measured by SAGINOMIYA (Japan) dustproof rubber characteristic tester (1 TON) (dustproof rubber characteristic tester)

[Equation 1]

Positive spring constant (Ks) = Load change amount (△ kgf) / Displacement change amount (△ ℓ (mm))

2. Evaluation of Copper Spring Constant (Kd)

The test conditions were measured using a SAGINOMIYA (Japan) anti-vibration rubber characteristic tester (anti-vibration rubber characteristic tester) at a preload of 90 kgf, frequency of 20 Hz, and amplitude of ± 0.5 mm. The dynamic spring constant (Kd) results are calculated in the instrument according to the test conditions.

3. Dynamic magnification measurement

The dynamic magnification is calculated by the following Equation 2, and the lower the dynamic magnification, the greater the effect of improving the vibration / noise of the vehicle. The constant spring constant cannot be changed to the unique characteristics of the vehicle. Vibration / noise improvement effect is great.

[Equation 2]

Dynamic magnification = Copper spring constant (Kd) / Constant spring constant (Ks)

4. Durability Evaluation

 1) Room temperature durability

The test conditions were 120 ± 240 kgf and frequency 3.33 반복. The test was repeated until the rubber part cracked using a dustproof rubber endurance tester (3 TON) manufactured by SAGINOMIYA (Japan).

 2) heat resistance

Using SAGINOMIYA (Japan) anti-vibration rubber endurance tester (3 TON), the parts were subjected to a preload 120 kgf in a CHAMBER (-50 to +200 ℃), and then thermally aged at 120 ℃ for 50 hours. The parts were allowed to stand at room temperature (20 ° C.) for at least 1 hour and then repeatedly tested until the rubber part cracked under the conditions of 120 ± 240 kgf and frequency: 3.33 kHz.

As shown in Table 1, compared with Comparative Examples 1 and 2, Examples 1 and 2 are improved by more than 2 to 4 dB in the real vehicle IDLE (area below 600 rpm) by reducing the dynamic spring constant, which is the main factor for determining the dynamic magnification. The effect was shown, and room temperature durability and heat resistance were also found to be very improved.

Therefore, the anti-vibration rubber composition according to the present invention uses a certain ratio of isoprene rubber and polybutadiene rubber instead of conventional natural rubber as a polymer, adjusts the ratio of sulfur and accelerator as a vulcanizing agent, and uses TBTD as an accelerator to provide dynamic characteristics and heat resistance durability. It is improved at the same time and is very useful for cars, ships and the like.

Claims (2)

In the dustproof rubber composition composed of 100 parts by weight of polymer, 30 to 45 parts by weight of filler, 3 to 7 parts by weight of antioxidant, 2 to 5 parts by weight of vulcanizing agent, The weight ratio of isoprene rubber and polybutadiene rubber as the polymer 70 to 80: 20 to 30, the dust-proof rubber composition, characterized in that the weight ratio of sulfur and accelerator as the vulcanizing agent is 1 to 1.5: 0.5 to 1. The anti-vibration rubber composition according to claim 1, wherein the accelerator is tetrabutylthiuram disulfide.