KR101745213B1 - Anti-vibration rubber composition for absorbing vibration of engine - Google Patents
Anti-vibration rubber composition for absorbing vibration of engine Download PDFInfo
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- KR101745213B1 KR101745213B1 KR1020150182059A KR20150182059A KR101745213B1 KR 101745213 B1 KR101745213 B1 KR 101745213B1 KR 1020150182059 A KR1020150182059 A KR 1020150182059A KR 20150182059 A KR20150182059 A KR 20150182059A KR 101745213 B1 KR101745213 B1 KR 101745213B1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
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- C08K3/0016—
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3442—Heterocyclic compounds having nitrogen in the ring having two nitrogen atoms in the ring
- C08K5/3445—Five-membered rings
- C08K5/3447—Five-membered rings condensed with carbocyclic rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/39—Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates
- C08K5/40—Thiurams, i.e. compounds containing groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
Abstract
More particularly, the present invention relates to a vibration-damping rubber composition for an engine mount, and more particularly to a vibration-damping rubber composition for an engine mount, which comprises a vulcanization accelerator, a crosslinking agent, an activator, an antioxidant and a filler in a proper amount in a mixture containing natural rubber, butadiene rubber and isoprene rubber, And it is possible to improve physical properties such as heat resistance, product durability and dynamic power (vibration insulation) by mixing, and it is possible to use automobile parts such as engine mount or suspension bush requiring heat resistance and vibration insulation simultaneously or transportation And more particularly to an anti-vibration rubber composition for an engine mount applicable to a vehicle.
Description
More particularly, the present invention relates to a vibration-damping rubber composition for an engine mount, and more particularly to a vibration-damping rubber composition for an engine mount, which comprises a vulcanization accelerator, a crosslinking agent, an activator, an antioxidant and a filler in a proper amount in a mixture containing natural rubber, butadiene rubber and isoprene rubber, And it is possible to improve physical properties such as heat resistance, product durability and dynamic power (vibration insulation) by mixing, and it is possible to use automobile parts such as engine mount or suspension bush requiring heat resistance and vibration insulation simultaneously or transportation And more particularly to an anti-vibration rubber composition for an engine mount applicable to a vehicle.
Various anti-vibration rubber parts have been applied to improve ride comfort by isolating vibration generated in a car. In particular, anti-vibration rubber has been applied to suspension components and suspension components related to driving parts and steering stability that are applied to chassis components closely related to ride comfort.
In particular, anti-vibration rubber parts that isolate the vibration generated in the vehicle during idling and running are required to have vibration isolation capability in a specific frequency range in order to exhibit its performance under various operating conditions.
However, the aging of the rubber part was promoted by the load inputted in various driving conditions, the high temperature generation during traveling due to the automobile environment regulation and high performance, and the increase of the ozone concentration through the change of the climatic environment. This is the main cause of the degradation of the vibration resistance of the automobile and the breakage of the rubber part.
In recent years, natural rubber materials having excellent fatigue resistance are basically used in order to compensate them. However, natural rubber generally has a limitation in improving ride comfort due to poor vibration insulation, and there is a problem in maintaining the initial ride feeling by progressing permanent deformation of the rubber with time.
Japanese Unexamined Patent Application Publication No. 2011-052200 discloses an anti-vibration rubber composition comprising natural rubber, zinc monomethacrylate and sulfur vulcanizing agent. However, the anti-vibration rubber composition disclosed in Japanese Unexamined Patent Publication No. 2011-052200 fails to simultaneously satisfy physical properties such as heat resistance, durability and vibration insulation there is a problem.
Therefore, it is necessary to study new materials that improve the ride quality by improving the physical properties such as durability and vibration insulation while applying the existing natural rubber as the basic material.
In order to solve the above problems, the present invention relates to a process for producing a rubber composition, which comprises mixing a vulcanization accelerator, a crosslinking agent, an activator, an antioxidant and a filler in an appropriate amount to a mixture containing a natural rubber, a butadiene rubber and an isoprene rubber, It is possible to improve the physical properties such as the performance and the magnification (vibration insulation), and it is possible to apply the present invention to automobile parts such as an engine mount or a suspension bush which requires heat resistance and vibration insulation simultaneously, I realized that I completed the invention.
Accordingly, an object of the present invention is to provide an anti-vibration rubber composition for an engine mount which is excellent in physical properties such as heat resistance, durability performance and vibration insulation.
The present invention relates to a rubber composition comprising 100 parts by weight of rubber containing 40 to 60% by weight of natural rubber, 20 to 30% by weight of butadiene rubber and 20 to 30% by weight of isoprene rubber, 1.5 to 3.0 parts by weight of vulcanization accelerator, The cross-linking agent comprises 0.2 to 0.7 parts by weight of sulfur and 1.0 to 3.0 parts by weight of a heat resistant cross-linking agent; 8 to 12 parts by weight of an activator; 2 to 15 parts by weight of an antioxidant; And 10 to 50 parts by weight of a filler.
The vibration-damping rubber composition for an engine mount according to the present invention is prepared by mixing a vulcanization accelerator, a crosslinking agent, an activator, an antioxidant and a filler in a proper amount to a mixture containing a natural rubber, a butadiene rubber and an isoprene rubber as base rubber, And has the effect of improving physical properties such as performance and dynamic power (vibration insulation).
In addition, the present invention can be applied to automobile parts such as an engine mount or a suspension bush to improve the ride quality of an automobile by improving the ride quality of the automobile, and also to a vehicle such as an airplane that requires both heat resistance and vibration insulation.
Hereinafter, the present invention will be described in more detail with reference to one embodiment.
The vibration-damping rubber composition for an engine mount of the present invention comprises 100 parts by weight of rubber comprising 40 to 60% by weight of natural rubber, 20 to 30% by weight of butadiene rubber and 20 to 30% by weight of isoprene rubber, 1.5 to 3.0 parts by weight of vulcanization accelerator ; The cross-linking agent comprises 0.2 to 0.7 parts by weight of sulfur and 1.0 to 3.0 parts by weight of a heat resistant cross-linking agent; 8 to 12 parts by weight of an activator; 2 to 15 parts by weight of an antioxidant; And 10 to 50 parts by weight of a filler.
Specifically, the vibration-damping rubber composition is a heterogeneous synthetic rubber which can complement the vibration insulating property of natural rubber and improve durability, and includes butadiene rubber excellent in rotation between molecular chains and isoprene rubber having a uniform molecular weight distribution of carbon double bonds Thereby improving durability and processability.
According to a preferred embodiment of the present invention, the natural rubber has excellent elongation, tensile strength, elasticity, etc., and has high strength at the time of vulcanization, so that it can be used as an automotive dustproof rubber. The natural rubber preferably has a Mooney viscosity of 30 to 40. Other than that, it is usually used in a range of 20 to 50. [ When the content of the natural rubber is less than 40% by weight, the elongation, tensile strength and elasticity may be lowered. When the content is more than 60% by weight, elongation and tensile strength Etc. are excellent, but the vibration insulation may be degraded relatively.
According to a preferred embodiment of the present invention, the butadiene rubber and the isoprene rubber may be mixed to improve vibration insulation of the natural rubber and improve durability. Specifically, the butadiene rubber is excellent in the rotatability between the molecular chains, so that the vibration energy can be quickly removed to improve the vibration insulation. When the content of the butadiene rubber is less than 20% by weight, the effect of vibration insulation is insignificant. When the content of the butadiene rubber is more than 30% by weight, the performance of the butadiene rubber may be drastically decreased.
In addition, the isoprene rubber has a uniform molecular weight distribution of the carbon double bond and can improve durability and processability. If the content of the isoprene rubber is less than 20% by weight, durability and processability may be deteriorated. If the content is more than 30% by weight, the performance of the isoprene rubber may be drastically decreased .
According to a preferred embodiment of the present invention, the vulcanization accelerator is selected from the group consisting of N-cyclohexylbenzothiozole-2-sulfenamide (CZ), tetramethylthiuram disulfide (TT) Can be used. If the content of the vulcanization accelerator is less than 1.5 parts by weight, the vulcanization time is too long to reduce the productivity. If the content of the vulcanization accelerator exceeds 3.0 parts by weight, a scorch is generated, Can occur. Such a vulcanization accelerator may serve to shorten the vulcanization time, lower the vulcanization temperature, and reduce the amount of the vulcanizing agent.
According to a preferred embodiment of the present invention, the cross-linking agent preferably includes 0.2 to 0.7 parts by weight of sulfur and 1.0 to 3.0 parts by weight of a heat-resistant cross-linking agent. Specifically, when the content of sulfur is less than 0.2 parts by weight, the durability of the rubber is deteriorated and a problem of poor adhesion occurs. When the content of sulfur exceeds 0.7 parts by weight, heat resistance is not satisfied.
According to a preferred embodiment of the present invention, the heat resistant crosslinking agent is used to cure the rubber and improve the mechanical properties of the rubber. The crosslinking agent may be N, Nm-phenylenedimaleimide, PMP, 0.5 to 1.5 parts by weight of hexamethylene-1,6-bis (thiosulfate), HTS}, and 1,3-bis (citraconimidomethyl) benzene) { 1,3-bis (citraconimidomethyl) benzene), P900}, or a mixture thereof, 0.5 to 1.5 parts by weight. Specifically, heat resistant crosslinking agent PMP improves heat resistance and maintains initial properties in spite of heat at high temperature. In case of HTS and P900, it improves fluidity and dynamic characteristics. If the content of the PMP is less than 0.5 parts by weight, heat resistance may be deteriorated. If the amount is more than 1.5 parts by weight, fatigue performance may be deteriorated due to lack of structural fluidity. If the content of the above-mentioned HTS, P900 or a mixture thereof is less than 0.5 parts by weight, the flowability and dynamic characteristics may be deteriorated. If more than 1.5 parts by weight, heat resistance of the material may be deteriorated.
According to a preferred embodiment of the present invention, the activating agent may be stearic acid, zinc oxide, or a mixture thereof, which activates the vulcanization accelerator, but is not limited thereto. If the amount of the activator is less than 8 parts by weight, the crosslinking reaction becomes slow. If the amount of the activator is more than 12 parts by weight, the crosslinking reaction may become too fast, resulting in a problem of productivity.
According to a preferred embodiment of the present invention, the antioxidant is selected from the group consisting of N-phenyl-N'-isopropyl-p-phenylenediamine (3C), 2-mercapto 2-Mcrcaptobenzimidazole, and Microcrystalline wax. The antioxidant may be blended in an amount of 2 to 15 parts by weight, more preferably 2 to 5 parts by weight, When the content of the microstructural wax is less than 5 parts by weight, the amount of the antioxidant is less than that of the antioxidant, the mechanical strength of the antivibration rubber is significantly reduced. If the content is less than 2 parts by weight, the amount of blooming on the surface of the rubber material is small, which prevents the anti-aging function. On the other hand, if the content is more than 5 parts by weight, It is a swelling rubber has a problem does not function properly as anti-vibration rubber.
According to a preferred embodiment of the present invention, the filler is preferably carbon black having particles having a large specific surface area. In general, carbon black is classified into SAF, ISAF, HAF, XCF, FEF, GPF, SRF, FT and MT depending on the particle size based on ASTM (AMERICAN STANDARD TEST METHOD) Carbon black MT (Medium Thermal) is preferably used. The reason for this is that SAF (particle diameter 11 to 19 nm) having a small particle size may have a large number of carbon black particles, thereby increasing friction between these particles and increasing the calorific value of rubber due to external force. The carbon black MT used in the present invention has the effect of maximizing the dispersibility to a large particle size and maximizing the rubber amount in contact with the carbon black to improve the vibration insulation.
If the content of the carbon black is less than 10 parts by weight, the mechanical reinforcement effect may be deteriorated and the durability may be significantly reduced. If the content of the carbon black is more than 50 parts by weight, There is a problem that it is not suitable as rubber for vibration proof rubber. And preferably 20 to 30 parts by weight.
Accordingly, the vibration-damping rubber composition for an engine mount according to the present invention can be obtained by mixing a vulcanization accelerator, a crosslinking agent, an activator, an antioxidant and a filler in a proper amount to a mixture containing a natural rubber, a butadiene rubber and an isoprene rubber as base rubber, It has an effect of improving physical properties such as endurance performance and dynamic magnification (vibration insulation).
In addition, the present invention can be applied to automobile parts such as an engine mount or a suspension bush to improve the ride quality of an automobile by improving the ride quality of the automobile, and also to a vehicle such as an airplane that requires both heat resistance and vibration insulation.
Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.
Example 1
Forty percent by weight of natural rubber having a pattern viscosity of 30 was sintered for 1 minute using a Banbury mixer, then 30 percent by weight of butadiene rubber and 30 percent by weight of isoprene rubber were added and the Soviets were further run for one minute. Then, as shown in Table 1, carbon black MT was added and kneaded for 10 minutes. Then, the activator and the antioxidant were mixed and kneaded for 2 minutes to prepare a carbon master batch. Sulfur and a heat resistant cross-linking agent were added as a cross-linking agent to the thus-prepared carbon master batch, and a vulcanization accelerator was added and dispersed and mixed using a roll mixer. In this way the use made of the rubber composition was prepared in the flow meter proper vulcanization of measuring a time after heated at 170 ℃ to 210 kgf / cm 2 pressurized by a compressor engine mount specimens of the anti-vibration rubber composition.
Examples 2 and 3 and Comparative Examples 1 to 5
The test pieces were prepared in the same manner as in Example 1, except that they were added in the proportions shown in Table 1 below.
Rubber
(weight%)
(FEF, N550)
(MT, N990)
PMP: N, Nm-Phenylenedimaleimide
P900: 1,3-Bis (citraconimidomethyl) benzene, FLEXSYS Inc.
CZ: N-cyclohexylbenzothiazole-2-sulfenamide, Toyo Chemical, oricel CZ
TT: tetramethylthiuram disulfide, TYO Chemical, oricel TT
Carbon black N550: Korea carbon black, Corax N550 (FEF)
Carbon Black N990: Korea Carbon Black, Corax N990 (MT)
ZnO: zinc oxide, Korean zinc oxide, 99.5%
3C: N-phenyl-N'-isopropyl-p-phenylenediamine, Kumamoto Kumanox 3C
MB: 2-Mcrcaptobenzimidazole, Miwon Chemical
Micro Wax: Microcrystalline wax (Hydrocarbon 100%), Seiko chemical
Experimental Example
The physical properties of the rubber specimens and products prepared in Examples 1 to 3 and Comparative Examples 1 to 5 were tested for the following items, and the results are shown in Table 2 below.
<Experimental Method>
(1) Hardness: Measured according to KS M 6784.
(2) Tensile strength, elongation and modulus: Measured with dumbbell type 3 according to KS M 6782.
(3) Aging property: The change in physical properties after aging at 85 ° C for 1,000 hours was measured.
(4) Evaluation of Mounting Solution: The change of physical properties after aging at 125 ° C for 1,000 hours was measured.
(5) Heat resistance durability: The durability performance after aging at 120 ° C for 100 hours was measured.
side
Rate of change (%)
Width
According to the results shown in Table 2, it was confirmed that hardness, tensile strength and elongation were almost similar in Examples 1 to 3 and Comparative Examples 1 to 5. However, when the hardness change value after aging and the change rate after aging were examined, it was confirmed that the results of Examples 1 to 3 were far superior to those of Comparative Examples 1 to 5. Especially, it was found that the rate of change of physical properties was small in terms of the tensile strength and elongation at the rate of change after aging.
The results of the room temperature endurance performance and the heat resistance endurance performance are as follows. In the case of Comparative Example 5 in which only the natural rubber was used, the heat resistance endurance performance was the lowest. In Comparative Examples 1 and 4, And the physical properties in the heat resistance endurance performance were lower than those in Examples 1 to 3 above.
On the other hand, in the case of Examples 1 to 3, when natural rubber, butadiene rubber, and isoprene rubber were mixed at a proper ratio, and carbon black MT having a particle size of 201 to 500 nm as a filler was mixed, ~ 5, it was confirmed that the physical properties such as product durability and dynamic power (vibration insulation) were improved. Thus, it can be seen that the vibration-damping rubber composition for an engine mount of the present invention is very suitable for use as an engine mount operating at a high temperature.
Therefore, the vibration-damping rubber compositions for engine mounts prepared in Examples 1 to 3 were prepared by mixing the vulcanization accelerator, the crosslinking agent, the activator, the antioxidant and the filler in a proper amount in a mixture containing natural rubber, butadiene rubber and isoprene rubber as base rubber It has been confirmed that there is an effect of improving the physical properties such as heat resistance, product endurance performance and dynamic magnification (vibration insulation) by mixing.
Claims (7)
1.5 to 3.0 parts by weight of a vulcanization accelerator;
The cross-linking agent comprises 0.2 to 0.7 parts by weight of sulfur and 1.0 to 3.0 parts by weight of a heat resistant cross-linking agent;
8 to 12 parts by weight of an activator;
2 to 15 parts by weight of an antioxidant; And
10 to 50 parts by weight of a filler;
Wherein the vibration-damping rubber composition for an engine mount comprises:
Wherein the vulcanization accelerator is N-cyclohexylbenzothiazole-2-sulfenamide (CZ), tetramethylthiuram disulfide (TT) or a mixture thereof.
The heat resistant crosslinking agent is a mixture of 0.5 to 1.5 parts by weight of N, N-m-phenylenedimaleimide (PMP) (citraconimidomethyl) benzene), P900}, or a mixture thereof in an amount of 0.5 to 1.5 parts by weight, based on 100 parts by weight of the mixture Wherein the rubber composition is a rubber composition for an engine mount.
Wherein the activator is stearic acid, zinc oxide or a mixture thereof.
The antioxidant may be selected from the group consisting of N-phenyl-N'-isopropyl-p-phenylenediamine, 2-Mcrcaptobenzimidazole and microstalin Wax (Microcrystalline wax). ≪ RTI ID = 0.0 > 11. < / RTI >
Wherein the filler is carbon black MT (Medium Thermal) having a particle diameter of 201 to 500 nm.
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| KR1020150182059A KR101745213B1 (en) | 2015-12-18 | 2015-12-18 | Anti-vibration rubber composition for absorbing vibration of engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190056601A (en) * | 2017-11-17 | 2019-05-27 | 현대자동차주식회사 | Rubber composition having high stiffness for absorbing vibration of engine |
| CN116102794A (en) * | 2022-09-09 | 2023-05-12 | 广东粤港澳大湾区黄埔材料研究院 | High-modulus high-temperature-resistant dynamic shear fatigue rubber composition for tire and preparation method thereof |
| KR20230123084A (en) | 2022-02-15 | 2023-08-23 | 현대자동차주식회사 | Rubber composition for motor mount with improved fatigue resistance and rubber for motor mount comprising the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011098995A (en) | 2009-11-04 | 2011-05-19 | Asahi Carbon Kk | Soft furnace carbon black to be compounded into vibration-proof rubber, and vibration-proof rubber composition comprising the same |
| JP2014237753A (en) * | 2013-06-07 | 2014-12-18 | 株式会社ブリヂストン | Rubber composition for vibration-proof rubber |
-
2015
- 2015-12-18 KR KR1020150182059A patent/KR101745213B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011098995A (en) | 2009-11-04 | 2011-05-19 | Asahi Carbon Kk | Soft furnace carbon black to be compounded into vibration-proof rubber, and vibration-proof rubber composition comprising the same |
| JP2014237753A (en) * | 2013-06-07 | 2014-12-18 | 株式会社ブリヂストン | Rubber composition for vibration-proof rubber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190056601A (en) * | 2017-11-17 | 2019-05-27 | 현대자동차주식회사 | Rubber composition having high stiffness for absorbing vibration of engine |
| KR102417538B1 (en) | 2017-11-17 | 2022-07-05 | 현대자동차주식회사 | Rubber composition having high stiffness for absorbing vibration of engine |
| KR20230123084A (en) | 2022-02-15 | 2023-08-23 | 현대자동차주식회사 | Rubber composition for motor mount with improved fatigue resistance and rubber for motor mount comprising the same |
| CN116102794A (en) * | 2022-09-09 | 2023-05-12 | 广东粤港澳大湾区黄埔材料研究院 | High-modulus high-temperature-resistant dynamic shear fatigue rubber composition for tire and preparation method thereof |
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