JPS63179942A - Slide-type vibration damping rubber - Google Patents

Abstract

PURPOSE:To obtain the titled rubber having effective self-lubrication characteristics to unnecessitate a particular sliding part, producible at a low cost and useful as a ball joint, etc., by compounding a silicone oil to a rubber material at a specific ratio. CONSTITUTION:100pts.wt. of a rubber material is compounded with 2-20pts.wt. of a silicone oil to obtain the objective rubber which is used by inserting between two parts and enables the sliding against at least one of the parts. The silicone oil has a kinetic viscosity of preferably 10-300cst.

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a sliding type anti-vibration rubber, and is particularly useful as a bearing rubber as a bearing member in a joint device, a bushing rubber used in a pivot joint of a vehicle suspension, etc. This invention relates to anti-vibration rubber products with self-lubricating properties.

(Background technology) Conventionally, in joint devices such as ball joints, bearing rubber, which is vibration-proofing rubber, is placed on the bearing of the shaft member for the purpose of absorbing transmitted vibrations, shocks, etc. (Refer to Japanese Publication No. 55-33059, etc.) Also, bush rubber is used as a cylindrical anti-vibration rubber for sliding type anti-vibration bushings arranged in pivot joints of vehicle suspensions (see US Pat. (See Japanese Patent No. 3331642, Japanese Utility Model Application Publication No. 59-153736, etc.). By the way, these anti-vibration rubbers such as bearing rubber and bushing rubber are installed between two members, and need to be able to slide on at least one of these members. However, since such anti-vibration rubber is made of ordinary rubber material, it has a large coefficient of friction and therefore does not exhibit sufficient sliding characteristics or lubricating properties.

For this reason, such sliding type anti-vibration rubbers are provided with a liner made of fluororesin on the surface that comes into sliding contact with a predetermined member, or between the anti-vibration rubber and the anti-vibration rubber. Techniques are known in which a sliding member such as a sleeve made of resin impregnated with oil is interposed between the members to be brought into contact to ensure sliding characteristics between them. In each of these, a special slidable member is interposed between the vibration isolating rubber and the member that is in sliding contact with the rubber, so they all have the problem of increasing manufacturing costs. For example, with regard to liners made of fluororesin, the material cost of the liner itself and the processing cost to form the liner on the sliding surface of the anti-vibration rubber are high, and there are problems in cost compared to performance. Also, even if a sliding member made of oleoresin is installed on the sliding surface of the anti-vibration rubber, it is necessary to use special parts or structures to install such a sliding member. Moreover, it takes time and effort to assemble such a structure, which inevitably leads to high costs.

(Problem to be Solved) The present invention has been made against the background of the above, and its purpose is to provide an effective self-sealing method that does not require any special sliding member. The purpose of the present invention is to provide a sliding type anti-vibration rubber that has lubricating properties, and another objective is to provide a anti-vibration rubber that can be manufactured at low cost while ensuring good sliding properties. It's about doing.

(Solution Means) In order to achieve this object, the present invention provides a sliding type vibration isolating rubber which is interposed between two members and is slidable with respect to at least one of the members. is formed using a rubber composition in which 2 to 20 parts by weight of silicone oil is blended with 100 parts by weight of the rubber material.

(Specific configuration) By the way, one way to realize a low-cost sliding type anti-vibration rubber is to make the anti-vibration rubber itself self-lubricating. Using vibrating rubber eliminates the need for special sliding members, etc.
This will reduce costs, but in the case of such self-lubricating vibration isolating rubber, the lubricant gradually oozes out from the rubber body that makes up the rubber, reducing the amount of lubrication consumed by sliding. It is desirable to compensate the material and thereby guarantee its sliding life.

However, when attempting to impart self-lubricating properties by blending commonly used lubricating oil into a rubber compound (rubber composition) for manufacturing anti-vibration rubber, if the amount blended is small, the effectiveness of the lubricating oil may be reduced. If no bleed is observed and the amount of bleed is large, some bleed can be expected depending on the type of lubricating oil, but such lubricating oil acts largely as a softener for the rubber compound, and such The hardness of the vulcanized molded product obtained from the rubber compound becomes so low that it can no longer be used as a vibration-proof rubber.

On the other hand, when a solid lubricant such as molybdenum disulfide or graphite is used as a lubricant blended into such a rubber compound, the lubricant is scattered on the rubber surface. It exhibits the characteristics of rubber, and there is an inherent problem that the friction coefficient does not decrease and sufficient sliding performance cannot be ensured.Also, when fluororesin particles, which are a similar solid lubricant, are blended, Even if there is, it does not provide sufficient sliding effect.

In addition, as mentioned above, although it does not bleed onto the rubber surface, wax, which is a rubber chemical (compounding agent), can be considered as a cause of the bloom phenomenon, but its compounding may reduce the coefficient of friction. There are limits to this, and there is also the inherent problem that when the temperature of the rubber body rises, the melt will actually seep into the rubber.

In short, in order to obtain a self-lubricating anti-vibration rubber, the lubricant to be added to the rubber compound is as follows:
Not only does it bleed effectively onto the rubber surface and effectively replenish the surface, but since it uses the rubber body as a medium, it does not deteriorate the physical properties of the rubber body. In addition, it does not deteriorate processability or workability such as vulcanization characteristics, which is a measure of productivity, and there is sufficient flexibility in designing the rubber compound regarding elastic modulus, which is a particularly required property for vibration-proof rubber materials. It has to be.

In order to obtain a lubricant that meets the above-mentioned circumstances, the present inventors have made extensive studies, and as a result, the present invention has revealed that a vibration-proof rubber obtained from a rubber compound blended with silicone oil is
It exhibits effective self-lubricating properties without reducing its physical performance, processability, workability, etc., and can be used as an effective sliding type anti-vibration rubber. It was completed based on the discovery that the effect can be maintained for a long period of time.

As is well known, the silicone oil used in the present invention is a linear polysiloxane with a relatively low degree of polymerization, such as an alkyl polysiloxane such as dimethyl polysiloxane, or an olefin thereof. Modified products, fluorine-modified products, etc. can be mentioned. In addition, this silicone oil generally has a 10 to 30
One having a kinematic viscosity (25°C) of 0 centistokes, preferably 10 to 100 centistokes is used,
This results in even better sliding performance.

In the present invention, the silicone oil is preferably used in an amount of 2 to 20 parts by weight based on 100 parts by weight of the rubber material constituting the rubber compound.
It will be blended in a proportion of ~10 parts by weight. However, if the amount of silicone oil blended is too small, it will not be possible to fully exhibit the desired self-lubricating properties or sliding performance.
In addition, too large a quantity may cause problems such as deterioration of workability such as kneading processability of the rubber compound and its moldability, and furthermore, deterioration of the physical performance of the resulting vibration-proof rubber. be.

As the main rubber material (raw material rubber) constituting the rubber compound, any of the rubber materials conventionally used in the production of anti-vibration rubber can be used, such as NR, BR, IR, 5BRSCR, NBR, EPDM
, IIR, or blend polymers thereof.

Furthermore, in order to manufacture the desired anti-vibration rubber, the rubber compound is made of various conventionally known compounding agents, such as vulcanizing agents and vulcanization accelerators, in addition to the above-mentioned rubber materials and silicone oil. , vulcanization aid, processing aid, anti-aging agent,
A reinforcing agent, and if necessary, a softener, a filler, a tackifier, etc. are mixed and prepared in the same manner as in the past.

By the way, among such compounding agents, the vulcanizing agent is usually compounded at a ratio of 0.1 to 10 parts by weight per 100 parts by weight of the rubber material, and includes, for example, sulfur, peroxide,
Thiourea, oxime, alkylphenol resin, disulfide, metal oxide, polyamines, etc. are appropriately selected and used. Vulcanization accelerators include sulfenamides, thiazoles, thiurams, dithiocarbamates, xanthates, etc., and are generally used in a proportion of 0.1 to 10 parts by weight per 100 parts by weight of the rubber material. Furthermore, metal oxides such as zinc oxide are used as vulcanization aids, and generally 3 parts by weight per 100 parts by weight of the rubber material.
It will be used in a proportion of ~15 parts by weight. In addition, as processing aids, fatty acids such as stearic acid and vegetable oils such as fatty oils are added at 0.5 to 100 parts by weight per 100 parts by weight of the rubber material.
It is used in a proportion of about 5 parts by weight, and an anti-aging agent (anti-deterioration agent) is usually added in an amount of 0 to 100 parts by weight of the rubber material.
．． It is blended in a proportion of 5 to 8 parts by weight. In addition, examples of the anti-aging agent include amine type, phenol type, imidazole type, carbamate metal salt, wax and the like. Furthermore, the reinforcing agent is a reinforcing filler that has the effect of enhancing the mechanical properties of the vulcanizate (tensile strength, hardness, tear strength, abrasion resistance, etc.), and is etc., and is generally blended in a proportion of 10 to 100 parts by weight per 100 parts by weight of the rubber material.

Among the softeners that can be added as needed, paraffinic, naphthenic, and aromatic process oils and ester plasticizers are used as softeners.
Used in a ratio of 0 to 40 parts by weight to 00 parts by weight,
In addition, fillers such as calcium carbonate, clay, and talc are used in an amount of 0 to 150 parts by weight per 100 parts by weight of the rubber material, and tackifiers such as alkyl formaldehyde resins, coumaron indene resins, xylene formaldehyde resins, etc. Resin, petroleum resin, hydrogenated rosin, etc.
It is blended in a proportion of 0 to 10 parts by weight per 100 parts by weight of the rubber material.

The rubber compound (rubber composition) that provides the sliding type anti-vibration rubber according to the present invention is obtained by blending a predetermined silicone oil with a predetermined rubber material according to the same mixing method as before, and then adding the above-mentioned various types. It is prepared by blending compounding agents, and is made into the desired anti-vibration rubber through a kneading process, a molding process, and a vulcanization process according to conventional processing methods.

(Examples) Below, some examples of the present invention will be shown to clarify the present invention more specifically, but the present invention is not limited in any way by the description of such examples. Needless to say, it is not something that can be accepted.

In addition to the following examples and the above-mentioned specific description, the present invention includes various changes, modifications, and changes based on the knowledge of those skilled in the art, as long as they do not depart from the spirit of the present invention. It should be understood that improvements and the like may be made.

Note that all parts and percentages in the following examples are expressed on a weight basis unless otherwise specified.

Example 1 Various rubber compounds were prepared by adding the additives shown in Table 1 below to the rubber compounding composition shown below. The silicone oil used as an additive was dimethylpolysiloxane of various viscosities, and one of the modified silicone oils used was a fluorine-modified silicone oil (kinematic viscosity: 100 centistokes). In addition, in the following composition,
Naphthenic oil was included only when the additive was solid.

y company soubun repayment 11 parts LNR...
...100 Stearic acid ...2ZnO
・・・・・・ 5 Anti-aging agent (amine type) ・・・・・・ 1 Carbon black ・・・・・・ 44 Naphthenic oil 8 ・・・・・・ 5 Vulcanization accelerator
1 (sulfenamide type) Sulfur 2.5 Additives (Table 1) χ* Blend only when the additive is solid.

Next, these various rubber compounds were subjected to molding and vulcanization operations according to conventional methods to produce the intended vibration-proof rubber materials. Using the obtained anti-vibration rubber material, its normal physical properties were measured, and the sample piece was subjected to a pull-out force test, and the results are shown in Table 1 below.

In addition, in the pull-out force test, a Zn-plated iron plate (thickness: 8fi) was used as the intermediate plate, and rubber sample pieces (25m x 40cm x 811t) were placed on both sides of the plate, and the compression ratio of the rubber sample pieces was 20%, by applying a predetermined compressive load from both sides, and measuring the force when pulling out the intermediate plate at a tensile speed of 100 cm/min as the pulling force, The smaller the force is, the better the self-lubricating property or sliding property is.

Table 1 (B phr...number of parts added to 100 parts of rubber 100%M...100% modulus (
kg/cm") T, 1.""Breaking strength (kg
/cm2) E, ...Elongation at break (%) Hs
...Hardness PTFB ...Polytetrafluoroethylene C
S... Centistokes (MJfM) Example 2 In the same manner as in Example 1, a rubber compound with the following rubber compounding composition was prepared, and the desired anti-vibration rubber was manufactured, and its normal physical properties were measured. A pullout force test was conducted, and the following excellent results were obtained.

Ingredients: 1 plate [BR...
...100 Stearic acid ...2 Zinc white ...5 Anti-aging agent (
Amine type) ・・・・・・ 1 Carbon black
・・・・・・ 44 silicone oil (10c
s)...10 Vulcanization accelerator ・
・・・・・・ 1.2 (sulfenamide type) Sulfur ・・・・・・ 2-cut I Okifu 41 pulling force (kg) ・・・・・・ 38 (
Normal physical properties) 100%M 24
TB...153
E...40
3Hs・・・・・・
60 Example 3 In the same manner as in Example 1, a rubber compound with the following rubber compounding composition was prepared, and the desired anti-vibration rubber was manufactured, its normal physical properties were measured, and a pulling force test was conducted. We obtained excellent results.

Ingredients Ingredients (parts) SBR...
...100 Stearic acid ...2 Zinc white ...5 Anti-aging agent (
Amine type) ・・・・・・ 1 Carbon black
・・・・・・ 44 silicone oil (10c
s)...10 Vulcanization accelerator ・
・・・・・・ 1.2 (sulfenamide type) Sulfur ・・・・・・ 2 effects 1 khufu - 3n flood value removal force (k+r) ・・・・・・ 35
(Normal physical properties) 100%M...23TIl
...168E8
......493H3...60 Example 4 After preparing a rubber compound with the following rubber composition in the same manner as in Example 1, the desired anti-vibration rubber was manufactured, and its normal physical properties were determined. In addition to measuring this, a pull-out force test was also conducted, and the following excellent results were obtained.

Ingredients Plate metal i1 part LCR...
...100 Stearic acid ...0.5 Magnesium oxide ...4 Zinc white
・・・・・・ 5 Anti-aging agent (amine type) ・Old... 1 Carbon Black
・・・・・・ 46 Aroma oil・Old・・・ 10 Silicone oil (10cs)・・・・・・
10 Vulcanization accelerator (thiuram type) ・・・・・・ 0
．． 5 Vulcanization accelerator (thiourea type) 0.
5 Toyomi Chichikawa Bond Removal Force (kg) Old... 42 (Normal Physical Properties) 100%M...26TII
...112E8
・・・・・・398Hs
...... 64 Example 5 After preparing a rubber compound with the following rubber compounding composition in the same manner as in Example 1, the desired anti-vibration rubber was manufactured, and its normal physical properties were measured, and the pulling force was measured. A test film was conducted and excellent results 1 were obtained as shown below.

K hill bottom part star survey 1yu plate LNBR...
...100 Stearic acid ...1 Zinc white ...5 Anti-aging agent (
Amine type) ・・・・・・ 1 Carbon blank
・・・・・・ 52 dioctyl phthalate
・・・・・・ 10 silicone oil (10cs)・
... 10 Vulcanization accelerator (thiazole type) ...
・・・ 1.5 Vulcanization accelerator (thiuram type) ・・・・・・
・0.3 sulfur ・・・・・・
1.5 elbows, five armpits, Toyosumi evaluator pulling force (kg)...45
(Normal physical properties) 100%M...31Tm
・・・・・・184El
・・・・・・406Hs
...... 68 Example 6 After preparing a rubber compound with the following rubber composition in the same manner as in Example 1, the desired anti-vibration rubber was produced, its normal physical properties were measured, and the pulling force was measured. A test film was conducted and the following excellent results were obtained.

■Kaikuni y gold 1" plate and 11R...
...100 Zinc white ...5 Carbon black ...36 Paraffin oil ...20 Silicone oil (
10cs)...10 Vulcanization accelerator
1.8 (dithiocarbamate type) Vulcanization accelerator (thiazole type) 1 sulfur
・・・・・・ 1.5 Arms 5 people's fertility... Bargaining power (kg) ・・・・・・ 38 (
Normal physical properties) 100%M...21TIl
・・・・・・ 69El
・・・・・・427Hs
62 Example 7 After preparing a rubber compound with the following rubber composition in the same manner as in Example 1, the desired anti-vibration rubber was produced, its normal physical properties were measured, and the pulling force was measured. A test film was conducted and the following excellent results were obtained.

■ Hill bottom L gold 1 Yu plate moon EPDM
...100 stearic acid
・・・・・・ 1 Zinc white
・・・・・・ 5 Anti-aging agent
... 1 (dithiocarbamate) Tackifier ... 3 (phenol/formaldehyde resin) carbon black
・・・・・・ 70 naphthenic oil
・・・・・・ 30 silicone oil (10cs)・
... 10 Vulcanization accelerator ...
・・ 1.5 (dithiocarbamate type) Vulcanization accelerator (thiuram type) ・・ 1.5 Sulfur ・・ 0.5 Reed and plate bum samurai ban Kunhira pulling force (kg) ・・・・・・・ 28(
Normal physical properties) 100%M...23T,
・・・・・・179EB
・・・・・・532Hs
...... 56 (Effects of the Invention) As is clear from the above explanation, the sliding type anti-vibration rubber according to the present invention is obtained using a rubber composition containing a predetermined amount of silicone oil. It exhibits effective self-lubricating properties due to the bleeding of the blended silicone oil, and can be advantageously used as a sliding type anti-vibration rubber without using a special sliding member as in the past. The conventional high cost factors were effectively eliminated and the cost could be advantageously reduced, and the physical properties of the rubber body could be reduced within a practical range. It has been possible to provide a vibration isolating rubber that can exhibit outstanding self-lubricating properties or sliding properties while maintaining the same properties as the previous one, while having almost no effect on processability or workability. This is why the present invention has great industrial significance.

Therefore, the sliding type anti-vibration rubber according to the present invention can be inserted between two members without using any special sliding member, and can exert an effective sliding function on at least one of the members. Therefore, it can be advantageously used, for example, as a bearing rubber in a joint device, or as a bush-type slidable anti-vibration rubber in a vehicle suspension device.

Claims (2)

[Claims] (1) A sliding type anti-vibration rubber that is interposed between two members and is capable of sliding on at least one of the members,
A sliding type anti-vibration rubber characterized in that it is formed using a rubber composition in which 2 to 20 parts by weight of silicone oil is blended with 100 parts by weight of a rubber material. (2) The sliding type anti-vibration rubber according to claim 1, wherein the silicone oil has a kinematic viscosity of 10 to 300 centistokes.