JPH11269309A - High density anti-vibration rubber and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject rubber capable of satisfying required characteristics such as a strength, a density and an elongation equal to these of a conventional one, and useful for an automobile, an industrial machine or the like by compounding a specific zinc powder in a specified amount with a chloroprene rubber. SOLUTION: This rubber is a high density vibration-proof rubber (e.g. the one having 2.6-3.6 g/cm<3> rubber density and 60-80 deg. rubber hardness) and is obtained by compounding (A) 100 pts.wt. chloroprene rubber, (B) 300-600 pts.wt. zinc powder having 6-7 g/cm<3> packing density (e.g. the one comprising 92-97 wt.% metal zinc as a filler, 3-8 wt.% zinc oxide as a vulcanizing agent and <=1 wt.% remainder, and having 3-10 μm average particle diameter). The vibration-proof rubber is obtained by mixing (X) a vulcanization-retarding agent with the component A and further mixing the component B with the obtained mixture, or simultaneously mixing the components X and B with the component A, to provide a mixture, processing the mixture to form a ribbon-like shape, molding the mixture with the ribbon-like shape to form a prescribed shape, and vulcanizing the molded product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-density anti-vibration rubber and a method for producing the same, and more particularly, to a vibrator attached to an electric appliance, a car, or another industrial machine, in which the vibrator is fixed, The present invention relates to a high-density anti-vibration rubber used for the purpose of performing vibration and sound insulation of pipes, heat exchangers, and the like depending on effects and characteristics, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In general, various kinds of vibration-proof rubbers are used for vibration bodies mounted on electric appliances, automobiles, and other industrial machines in order to prevent noise and vibration. Particularly in the field of electric appliances, in recent years, cost reduction and environmental improvement have become important issues in pursuit of economic efficiency such as energy saving.

[0003] Accordingly, the importance of the vibration isolating rubber has been further increased in terms of vibration, noise, and the like, and the characteristics required for the rubber have been gradually changed. The required characteristics of the vibration-proof rubber are: 1) It must have a predetermined hardness and density in order to support a large static load. 2) It has a low vibration transmissibility. 3) It is resistant to bending fatigue against long-term repeated external force. High durability and durability.

In order to satisfy such required characteristics, a high-density vibration-proof rubber material in which a filler such as carbon black or a filler is blended with chloroprene rubber has been used. By blending fillers and fillers in this way,
The required strength is obtained, and physical properties such as hardness, tensile strength and elongation can be adjusted by adjusting the mixing ratio.

[0005]

As a filler compounded in such a high-density vibration-proof rubber material, a lead-based filler is generally used because of its advantages of being inexpensive and having a high density.

By the way, high-density vibration-proof rubber materials are used in electric appliances, automobiles, and other industrial machines. When these products are disposed of, they are generally buried as oversized garbage.

However, when a product using a high-density vibration-proof rubber containing a lead-based filler is disposed of by landfill, the high-density vibration-proof rubber gradually deteriorates and lead is eluted into the soil, causing environmental pollution. There is a problem. In particular, in recent years, regulations on environmental issues have been rapidly strengthened, and there is a demand for minimizing environmentally hazardous substances contained in products.

The present invention solves the above problems and provides a high-density anti-vibration rubber which does not cause environmental pollution at the time of disposal and has the same characteristics as conventional ones, and a method for producing the same. .

[0009]

The high-density rubber cushion of the present invention is characterized in that its composition has a special structure. According to the present invention, it is possible to provide a high-density anti-vibration rubber that satisfies various required characteristics such as strength, density and elongation without polluting the environment.

[0010] The method for producing a high-density vibration-isolating rubber according to the present invention is characterized in that a step of adding a vulcanization retarder is specified. According to the present invention, a high-density vibration-proof rubber in which each component is uniformly dispersed can be manufactured with high mass productivity.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The high-density vibration-insulating rubber according to claim 1 has a packing density of 6 to 100 parts by weight of chloroprene rubber.
It is characterized in that at least 300 to 600 parts by weight of zinc powder of 7 g / cc is blended.

According to this structure, a desired high density can be obtained by mixing zinc powder into chloroprene rubber, and other necessary physical properties such as loss coefficient, compression set, tensile strength, elongation, etc. Etc. can also reach a practical level.

[0013] Zinc is used in various fields, such as for improving the corrosion resistance of steel sheets. At present, zinc is a substance that does not pose a problem to the environment. Even if the components are eluted by being buried therein, the occurrence of environmental pollution can be prevented.

According to a second aspect of the present invention, there is provided the high-density vibration-isolating rubber according to the first aspect, wherein the zinc powder comprises metallic zinc as a filler.
2 to 97 wt%, and 3 to 8 wt% of zinc oxide as a vulcanizing agent
% And the balance of 1 wt% or less.

According to this configuration, zinc and zinc oxide are simultaneously mixed with chloroprene rubber to obtain a material having desired physical properties. The high-density anti-vibration rubber according to claim 3 is
3. The method according to claim 2, wherein the average particle size of the zinc powder is 3 to 10 μm.
It is characterized by being.

According to this configuration, the ratio between the zinc metal and the zinc oxide can be easily controlled. In addition, by using a powder having the above-mentioned average particle size as a filler, the molding fluidity of the raw material is improved, and injection molding that is efficient and excellent in mass productivity can be applied.

A high-density rubber according to claim 4 is characterized in that the rubber has a rubber density of 2.6 to 3.6 g / cc as measured by the Archimedes method. According to this configuration, it is possible to obtain an excellent vibration-proofing property when closely fixed to the vibrating object.

The high-density vibration-isolating rubber according to the fifth aspect is characterized in that, in the first aspect, the rubber hardness measured by a spring hardness type A according to JIS-K6301 is Hs 60 to 80 °.

According to this configuration, it is possible to obtain a durability in which the anti-vibration rubber can be used repeatedly. In the method for producing a high-density vibration-isolating rubber according to claim 6, at least a raw material consisting of chloroprene rubber, zinc powder and a vulcanization retarder is mixed to produce a high-density vibration-isolating rubber. After mixing with chloroprene rubber, zinc powder is mixed to form a mixture, or a vulcanization retarder and zinc powder are simultaneously mixed with chloroprene rubber to form a mixture, and the mixture is processed into a ribbon shape, After molding to the shape of
It is characterized by being vulcanized.

According to this structure, zinc powder as a filler for densification can be uniformly dispersed in chloroprene rubber. The method for producing a high-density vibration-isolating rubber according to claim 7 is the method according to claim 6, wherein
~ 97wt% and zinc oxide as a vulcanizing agent 3 ~ 8wt%
And a balance of 1 wt% or less.

According to this configuration, the amount of zinc oxide contained in the zinc powder can be controlled, and a high-density vibration-proof rubber having desired physical properties can be manufactured with good mass productivity. The method for producing a high-density vibration-isolating rubber according to claim 8 is characterized in that in claim 7, zinc powder having an average particle size of 3 to 10 μm is used.

According to this configuration, mass productivity can be improved. According to a ninth aspect of the present invention, there is provided a method for producing a high-density vibration-isolating rubber according to the sixth aspect, wherein a sulfenamide-based vulcanization retarder is used.

According to this configuration, even when the zinc oxide content fluctuates, vulcanization in the course of the manufacturing process can be efficiently delayed. An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment) FIGS. 1 to 3 show (embodiment) of the present invention. In producing the rubber composition, in order to compare and examine the suitable compounding ratio of zinc powder to chloroprene rubber, in the following Examples 1 to 3, Comparative Examples 1 to 3 A rubber composition was prepared.

Example 1 Chloroprene rubber, zinc powder as a filler and a vulcanizing agent, a sulfenamide-based vulcanization retarder, magnesium oxide as a vulcanization aid, and processing were used as materials for the rubber composition. Using stearic acid as an auxiliary agent, carbon black SRF as a reinforcing agent, an aroma-based oil as a softener, an antioxidant, and an ester compound as a processing aid, the mixing ratio is shown in Table 1. I did it.

[0026]

[Table 1]

The zinc powder was 92% by weight of metallic zinc.
, 7% by weight of zinc oxide and 1% by weight of the balance, having an average particle size of 5 μm and a packing density of 6.3 g / cc. Using the above-mentioned materials, a high-density vibration-proof rubber was produced in the manufacturing process shown in FIG.

First, in step 1, chloroprene rubber as a raw rubber was masticated. Then, in step 2, materials other than the above-mentioned chloroprene rubber were compounded and kneaded, and in step 5, a compound rubber as a final batch was obtained.

In the step 6, the obtained compounded rubber is processed into a ribbon shape, aged and then aged 5 to 8 mm in thickness and 50 to 8 in width.
After molding into a ribbon shape of 0mm, at 195 ° C for 3 minutes,
A test piece was prepared by performing a vulcanization treatment, and various physical properties were measured.

Table 2 shows the physical properties of the obtained test pieces. In each of the following Examples and Comparative Examples, the hardness was measured in accordance with the measurement method of spring hardness A type described in JIS-K6301 and the compression set was 100 ° C. × 72 h.
Was determined under the following conditions. The loss coefficient tan δ is calculated according to JIS
15 Hz, amplitude 1. according to the method described in K-6394.
It was measured under 0% conditions.

[0031]

[Table 2]

Examples 2 and 3 The mixing ratio of each component was as shown in Table 1. Other than that, a test piece was prepared in the same manner as in Example 1, and various physical properties were measured.

Table 2 shows the physical properties of the obtained test pieces.

The test piece prepared in Example 3 was subjected to 180-degree measurement using a disc rheometer (manufactured by Toyo Seiki Seisaku-sho, Ltd.).
The vulcanization curve was measured at a temperature of ° C. The obtained vulcanization curve is shown in FIG. As shown in FIG. 3, in Example 3, a vulcanization curve suitable for mass production was obtained.

The vulcanization curve optimizes vulcanization conditions of rubber by continuously measuring the vulcanization state. That is,
Finding the value M _E minus the minimum torque M _L from the final maximum torque M _H ∞ arriving vulcanized. Next, t ₁₀ and t ₉₀ which are 10% M _E and 90% M _E are obtained, and t ₉₀ and t ₁₀ are obtained.
This by obtaining a difference Delta] t ₈₀ the index of the vulcanization rate of the.

Comparative Example 1 The mixing ratio of zinc powder to chloroprene rubber was made smaller than the range of the present invention, and the mixing ratio of the rest was as shown in Table 1. Otherwise, a test piece was prepared in the same manner as in Example 1.

Table 2 shows the physical properties of the obtained test pieces.

Comparative Examples 2 and 3 The mixing ratio of zinc powder to chloroprene rubber was set to be larger than the range of the present invention, and the mixing ratio of the remainder was as shown in Table 1. Otherwise, a test piece was prepared in the same manner as in Example 1.

As is apparent from Examples 1 to 3, when the mixing ratio of zinc powder to 100 parts by weight of chloroprene rubber was 300 to 600 parts by weight, a desired high density could be obtained. In addition, other necessary physical properties such as loss coefficient, compression set, tensile strength, elongation and the like were able to reach practical levels.

The filling density of the zinc powder varies depending on the composition and particle size of the zinc powder. In the present invention, the use of a powder having a filling density of 6 to 7 g / cc makes it possible to achieve the object of the present invention. 2.6 to 3.6 g / cc of high density rubber was obtained.

The zinc powder contains 92 to 97% by weight of metallic zinc as a filler and zinc oxide 3 as a vulcanizing agent.
Since a composition constituted by ８8 wt% and a balance of 1 wt% or less was used, even if zinc metal and zinc oxide were simultaneously mixed with chloroprene rubber, a substance having desired physical properties was obtained.

Furthermore, zinc is currently used in various fields, for example, for the purpose of improving the corrosion resistance of steel sheets, and is not considered to be a substance that pollutes the environment at present.
Therefore, it is considered that even if the high-density vibration-isolating rubber obtained in the above embodiment is buried in the soil and disposed of, the environment is not polluted.

On the other hand, as shown in Comparative Example 1, when the mixing ratio of the zinc powder to the chloroprene rubber was too small, the hardness was lowered and the density was not increased. In addition, when this rubber was measured for vibration isolation characteristics in an actual machine test,
Desired anti-vibration properties could not be obtained.

Further, as shown in Comparative Examples 2 and 3, when the mixing ratio of zinc powder to chloroprene rubber was too large,
The hardness becomes too high, resulting in poor flexibility. That is, rubber elasticity such as tensile strength and elongation is inferior, and a material that can withstand actual use cannot be obtained.

Therefore, in the present invention, the mixing ratio of zinc powder to 100 parts by weight of chloroprene rubber is 30%.
It is necessary to be 0 to 600 parts by weight. In Examples 1 to 3 described above, the rubber composition was manufactured by the manufacturing process shown in FIG. 1. This is because the zinc powder in the present invention is an oxidizing agent that acts not only as a filler but also as a vulcanizing agent. This is because a material containing zinc is used.

In such a zinc powder, the vulcanization reaction in which zinc oxide contained in the zinc powder is mixed with the chloroprene rubber in a state where the vulcanization retarder is dispersed in the entire chloroprene rubber in advance causes a partially localized vulcanization reaction. It is preferable because it hardly occurs. That is, it is preferable to add a vulcanization retarder in a step prior to mixing zinc powder with chloroprene rubber.

However, as shown in Examples 1 to 3,
When the amount of zinc oxide contained in the zinc powder was small, it was found that mixing the zinc powder and the vulcanization retarder in step 2 did not cause a serious problem.

Therefore, in the present invention, a vulcanization retarder is mixed with chloroprene rubber and then mixed with zinc powder to form a mixture, or a vulcanization retarder and zinc powder are simultaneously mixed with chloroprene rubber to form a mixture. The mixture is processed into a ribbon shape, molded into a predetermined shape, and then vulcanized, whereby a zinc powder is uniformly dispersed in chloroprene rubber to obtain a high-density vibration-proof rubber. Obtainable.

Next, in order to examine the influence of the type of filler to be added to the chloroprene rubber, in Comparative Examples 4 and 5, a rubber composition was prepared using a filler other than zinc powder as the filler.

Comparative Example 4 Instead of the zinc powder of the present invention, a conventional litharge containing lead oxide as a main component was used as a filler.
The mixing ratio of each component was as shown in Table 3.

[0051]

[Table 3]

Then, a high-density anti-vibration rubber was prepared in the manufacturing process shown in FIG. First, in step 1, chloroprene rubber as a raw rubber was masticated. Then, in step 2, materials other than the above-mentioned chloroprene rubber, vulcanizing agent, and vulcanization accelerator were blended and kneaded, and in step 3, a master batch was prepared.

In step 4, a vulcanizing agent and a vulcanization accelerator were blended and kneaded with the obtained master batch, and in step 5, a compounded rubber as a final batch was obtained. In the step 6, the obtained compounded rubber is processed into a ribbon shape, aged, molded into a predetermined shape, vulcanized at 195 ° C. for 3 minutes to prepare a test piece, and various physical properties are measured. did.

Table 4 shows the physical properties of the obtained test piece.

[0055]

[Table 4]

Comparative Example 5 Iron powder was used as a filler instead of zinc powder, and the mixing ratio of each component was as shown in Table 3. Otherwise, a test piece was prepared in the same manner as in Comparative Example 4.

Table 4 shows various physical properties of the obtained test piece.

Comparative Example 4 shows an example of a conventionally used high-density vibration-proof rubber, and various physical properties are almost the same as those of the high-density vibration-proof rubber of the present invention. However, unlike Examples 1 to 3, lead oxide as a filler has no function as a vulcanizing agent. Therefore, in order to uniformly disperse each component, as shown in FIG. 2, materials other than the vulcanizing agent and the vulcanization accelerator are first mixed, and then the vulcanizing agent and the vulcanizing agent are added to the obtained master batch. It is necessary to mix a sulfur accelerator, and the process becomes complicated.

In addition, since lead is contained, lead is eluted into the soil during disposal treatment, causing a problem of polluting the environment.
In Comparative Example 5, since the iron powder was used as the filler, rubber characteristics such as tensile strength and elongation were inferior to the high-density vibration-proof rubber of the present invention obtained in Examples 1 to 3 above.

In addition, iron powder, which is a filler, is easily oxidized to an iron rust state in a high-temperature and high-humidity atmosphere at 35 ° C. and 90% relative humidity, probably because iron powder has poor adhesion to chloroprene rubber. became.

For reference, the high-density vibration-isolating rubbers obtained in Examples 1 to 3 were exposed to a similar high-temperature and high-humidity atmosphere. A high-density vibration-proof rubber suitable for the above was obtained.

Next, the effect of the composition of the zinc powder was examined. The average particle size of the zinc powder was 5 μm.

Examples 4 and 5 Table 5 shows the composition of zinc powder and the mixing ratio of sulfenamide as a vulcanization retarder. Otherwise, a test piece was prepared in the same manner as in Example 3.

[0064]

[Table 5]

Table 6 shows the physical properties of the obtained test piece.

[0066]

[Table 6]

Comparative Example 6 The composition of the zinc powder and the mixing ratio of the vulcanization retarder were as shown in Table 5. That is, in the composition of the zinc powder, the compounding ratio of metallic zinc as a filler was made smaller than the range of the present invention, and the compounding ratio of zinc oxide as a vulcanizing agent was made larger than the range of the present invention. Otherwise, a test piece was prepared in the same manner as in Example 3.

Table 6 shows the physical properties of the obtained test piece.

As is clear from Table 5, it was necessary to increase the amount of the vulcanization retarder as the amount of zinc oxide contained in the zinc powder increased. However, as shown in Comparative Example 6, if the amount of the vulcanization retarder is too large, the vulcanization treatment as the final step takes a long time, and the vulcanization treatment at 195 ° C. for 3 minutes results in sufficient vulcanization. Did not. As a result, Table 6
As shown in (1), not only rubber properties such as tensile strength and elongation were deteriorated due to insufficient vulcanization, but also compression set increased. Although it is possible to improve the physical properties if a sufficient time is taken for the vulcanization, it is not preferable because mass productivity is reduced.

When the amount of zinc oxide contained in the zinc powder increases, the density of the vibration-proof rubber tends to decrease.
Conversely, if the ratio of metallic zinc in the zinc powder is increased, vulcanization will be insufficient even at the end, so in order to obtain desired physical properties,
It was necessary to mix zinc oxide (zinc white) again in the final batch, and the ratio of the amount of zinc oxide finally added to the chloroprene rubber was not much different.

From the above, considering the physical properties, mass production efficiency, cost and ease of management of the high-density vibration-isolating rubber, the composition of the zinc powder is 92 to 97% by weight of metallic zinc and 3 to 8% by weight of zinc oxide. In the production method, the zinc powder and the vulcanization retarder are preferably mixed at the same time, while adjusting the weight percent and the balance to 1% by weight or less.

In the above Examples 1 to 5, zinc powder having an average particle size of 5 μm was used, but the zinc powder of the present invention preferably has an average particle size of 3 to 10 μm.
If the particle size of the zinc powder is too small, during storage or kneading of the rubber, the fine particles and the surface layer of the zinc powder will oxidize in the atmosphere and act as a vulcanizing agent for the rubber, causing it to flow before processing into the desired shape. Loses sex.

In order to inhibit this, a large amount of vulcanization retarder may be added in the compounding. However, if too much vulcanization retardant is added, it takes time to sufficiently vulcanize in the final vulcanization step. It takes too much and mass productivity is reduced.

On the other hand, if the zinc powder is too large, the fluidity during injection molding will be poor, and the mass productivity will also be poor. Therefore, it is preferable to select a zinc powder having an average particle diameter of 3 to 10 μm, more preferably 5 to 8 μm. Even in this case, the addition amount of the processing aid is increased as the average particle size increases,
Productivity needs to be optimized.

The high-density vibration-proof rubber obtained in the present invention has a density of 2.6 to 3.6 g / cc. The high-density anti-vibration rubber of the present invention needs to have the same physical properties as the conventional high-density anti-vibration rubber containing lead oxide obtained as a filler in Comparative Example 4. Therefore, if the density is lower than 3.4 g / cc of the conventional high-density anti-vibration rubber, it is necessary to increase the volume of the anti-vibration rubber to obtain the same performance. Will occur.

Although there is no problem due to the large density, sufficient rubber properties such as tensile strength and elongation cannot be obtained, and excessively hard, resulting in poor repeatability in practical use. .

The hardness of the anti-vibration rubber obtained in the present invention is Hs 60 to 80 °. When the hardness of the anti-vibration rubber is 80 ° or more, it becomes too hard, resulting in poor repeatability in practical use, and when the hardness is 60 ° or less, a method of adding zinc powder as a filler may obtain desired performance. become unable.

Examples of the vulcanization retarder used for producing a high-density vibration-proof rubber include sulfenamides, phthalic anhydride, N-nitrosodiphenylamine and N-cyclohexylthiophthalimide. In the present invention, a sulfenamide-based vulcanization retarder can be suitably used because it can cope with a change in the amount of zinc oxide contained in the zinc powder without changing the amount of addition so much.

By using such a sulfenamide-based vulcanization retarder, mass productivity such as an increase in the amount of zinc oxide when storing zinc powder or a decrease in fluidity when storing a master batch is caused. It is effective for solving problems.

In order to confirm the anti-vibration effect of the high-density anti-vibration rubber of the present invention, the high-density anti-vibration rubber prepared in Example 3 was accumulated in an outdoor unit of a separate type air conditioner on the compressor suction side. Was used as a high-density anti-vibration rubber. Then, vibration of 15 to 150 Hz was intentionally applied to confirm the anti-vibration effect.

As a result, the same excellent effects as those of the conventional lead-based vibration-proof rubber could be obtained with the zinc-based vibration-proof rubber of the present invention.

[0082]

As described above, according to the first aspect of the present invention, the chloroprene rubber has a packing density of 6 to 6 as a filler.
The desired high density can be obtained by mixing 7 g / cc of zinc powder. Further, other necessary physical properties such as loss coefficient, compression set, tensile strength and elongation can be made practical levels, and furthermore, environmental pollution can be prevented.

According to the second aspect of the present invention, by using zinc powder having a limited composition range, the chloroprene rubber can be vulcanized and densified at the same time. Claim 3
ADVANTAGE OF THE INVENTION According to the described invention, it becomes easy to control the ratio of metallic zinc and zinc oxide in zinc powder. In addition, molding fluidity is also improved, and injection excellent in mass productivity can be applied.

According to the fourth and fifth aspects of the present invention, by limiting the density and hardness of the high-density anti-vibration rubber, it is possible to obtain excellent anti-vibration characteristics when it is fixed in close contact with a vibrating object. it can. Further, it is possible to obtain an anti-vibration rubber which has excellent durability and can be used repeatedly.

According to the sixth aspect of the present invention, a high-density vibration-proof rubber in which zinc powder is uniformly dispersed can be obtained by mixing a vulcanization retarder with chloroprene rubber in advance or simultaneously. it can.

According to the seventh aspect of the present invention, by using zinc powder having a limited composition range, the amount of zinc oxide contained in the zinc powder can be easily controlled, and a high-density protective material having desired physical properties can be obtained. Vibration rubber can be manufactured with good mass productivity.

According to the eighth aspect of the present invention, by defining the average particle size of the zinc powder, excessive oxidation of metallic zinc can be prevented, and the zinc powder can be manufactured with high productivity. According to the ninth aspect of the present invention, by selecting a sulfenamide-based as a vulcanization retarder, even when the content of zinc oxide fluctuates, the heat history during the production process can be efficiently reduced. Vulcanization can be delayed.

The high-density anti-vibration rubber configured as described above is used to fix the vibrating body in close contact with a vibrating body particularly mounted on electric appliances, automobiles, and other industrial machines. And a high-density anti-vibration rubber used for the purpose of vibration and sound insulation of heat exchangers and the like.

[Brief description of the drawings]

FIG. 1 is a diagram showing a manufacturing process of a high-density vibration-isolating rubber according to an embodiment.

FIG. 2 is a view showing a manufacturing process of a high-density vibration-proof rubber in Comparative Examples 4 and 5.

FIG. 3 is a view showing a vulcanization curve of a high-density vibration-proof rubber in Example 3.

[Explanation of symbols]

 1 Raw material rubber 2 Compounding materials and chemicals 3 Compounding rubber

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Norimasa Kitamura 3-9-13 Higashiobashi, Higashinari-ku, Osaka, Osaka Prefecture Inside Okayasu Rubber Co., Ltd. 9-13 Okayasu Rubber Co., Ltd.

Claims (9)

[Claims] 1. A high-density vibration-proof rubber comprising at least 300 to 600 parts by weight of zinc powder having a packing density of 6 to 7 g / cc per 100 parts by weight of chloroprene rubber. 2. The method according to claim 1, wherein the zinc powder is metallic zinc 9 as a filler.
2 to 97 wt%, and 3 to 8 wt% of zinc oxide as a vulcanizing agent
% And a balance of 1 wt% or less. 3. The high-density rubber cushion according to claim 2, wherein the zinc powder has an average particle size of 3 to 10 μm. 4. The high-density rubber according to claim 1, wherein the rubber density measured by the Archimedes method is 2.6 to 3.6 g / cc. 5. The high-density vibration-isolating rubber according to claim 1, wherein the rubber hardness measured by a spring hardness A type described in JIS-K6301 is Hs 60 to 80 °. 6. A method for producing a high-density vibration-isolating rubber by mixing at least raw materials comprising chloroprene rubber, zinc powder and a vulcanization retarder, and mixing the zinc powder after mixing the vulcanization retarder with the chloroprene rubber. Or a mixture of vulcanization retardants and zinc powder simultaneously mixed with chloroprene rubber to form a mixture.The mixture is processed into a ribbon, molded into a predetermined shape, and then vulcanized. To manufacture high-density vibration-proof rubber. 7. 92-97 wt. Of metallic zinc as a filler
%, 3 to 8% by weight of zinc oxide as a vulcanizing agent, and the balance 1
7. The method for producing a high-density vibration-proof rubber according to claim 6, wherein zinc powder consisting of not more than wt% is used. 8. The method according to claim 7, wherein zinc powder having an average particle size of 3 to 10 μm is used. 9. The method for producing a high-density vibration-proof rubber according to claim 6, wherein a sulfenamide-based vulcanization retarder is used.