JP3370596B2 - High-density anti-vibration rubber and its manufacturing method - Google Patents

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 manufacturing the same, and more particularly, to a vibrating body attached to an electric appliance, an automobile, or other industrial machine, which is fixed to the vibrating body and has a mass thereof. The present invention relates to a high-density anti-vibration rubber used for the purpose of performing anti-vibration and soundproofing of pipes, heat exchangers, etc., depending on the effects and characteristics, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In general, a wide variety of anti-vibration 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 while pursuing economic efficiency such as energy saving.

Along with this, the importance of anti-vibration rubber is further increasing from the viewpoint of vibration and noise, and the required characteristics for it are gradually changing to hardness. The required properties for anti-vibration rubber are as follows: 1) It must have a certain hardness and density to support a large static load. 2) It must have a low vibration transmissibility. It has excellent properties and durability.

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

[0005]

As a filler to be blended with such a high-density vibration-proof rubber material, a lead-based one is generally used because it has the advantages of low cost and high density.

By the way, the high-density anti-vibration rubber material is used for electric appliances, automobiles, and other industrial machines, and when disposing of these products, it is common to bury them as coarse dust.

[0007] However, when a product using a high-density anti-vibration rubber containing a lead-based filler is disposed of by landfill, the high-density anti-vibration rubber is gradually deteriorated and lead is eluted into the soil to cause environmental pollution. There is a problem. In particular, in recent years, regulations on environmental problems have been rapidly strengthened, so that it is required to reduce environmentally hazardous substances contained in products as much as possible.

The present invention solves the above problems and provides a high-density anti-vibration rubber that does not cause environmental pollution when it is disposed of, and has the same characteristics as conventional ones, and a method for producing the same. .

[0009]

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

Further, the method for producing a high-density anti-vibration rubber of the present invention is characterized by defining a step of compounding a vulcanization retarder. According to the present invention, a high-density anti-vibration rubber in which each component is uniformly dispersed can be manufactured with good mass productivity.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The high-density anti-vibration rubber according to claim 1 comprises a filler for 100 parts by weight of chloroprene rubber.
92-97 wt% of metallic zinc as a vulcanizing agent and oxidation as a vulcanizing agent
It is characterized in that at least 300 to 600 parts by weight of zinc powder having a packing density of 6 to 7 g / cc and containing 3 to 8% by weight of zinc and the balance of 1% by weight or less is blended.

According to this constitution, by mixing zinc powder into chloroprene rubber, a desired high density can be obtained, and other necessary physical properties such as loss coefficient, compression set, tensile strength and elongation are obtained. Etc. can reach a practical level. In addition, metallic zinc and zinc oxide are the same.
Sometimes it has the desired physical properties when mixed with chloroprene rubber.
Is obtained.

Zinc is used in various fields such as improving the corrosion resistance of steel sheets and is a substance that is considered to have no environmental impact at the present time. Even if the components are buried and eluted, the environmental pollution can be prevented.

[0014]

[0015]

The high-density anti-vibration rubber according to claim 2 is
1, the average particle size of the zinc powder is 3 to 10 μm.
It is characterized by With this configuration, it becomes easy to control the ratio of metallic zinc and zinc oxide. Further, by using the powder having the above-mentioned average particle size as the filler, the molding fluidity of the raw material is improved, the efficiency is high, and the injection molding excellent in mass productivity can be applied.

The dense rubber vibration insulator according to claim 3, in claim 1, rubber density measured by Archimedes' method is characterized by a 2.6~3.6g / cc. With this configuration, it is possible to obtain excellent anti-vibration characteristics when closely fixing the vibration object.

The high-density anti-vibration rubber according to claim 4 is characterized in that, in claim 1, the rubber hardness measured by the spring hardness A type according to JIS-K6301 is Hs 60 to 80 °. With this configuration, the anti-vibration rubber is repeated
The durability that can be used can be obtained.

The method for producing the high-density vibration-damping rubber according to claim 5 is such that at least the chloroprene rubber and the filler are used.
92-97 wt% of metallic zinc and zinc oxide as vulcanizing agent
When producing a high-density anti-vibration rubber by mixing a raw material consisting of a zinc powder composed of 3 to 8 wt% and the balance of 1 wt% or less, and a vulcanization retarder , the vulcanization retardant is mixed with chloroprene rubber. After that, mix the zinc powder to make a mixture
Or, or a vulcanization retarder and zinc powder are mixed simultaneously chloroprene rubber to create a mixture, and processing the mixture created in ribbon, was molded into a predetermined shape, and characterized in that vulcanizing To do.

According to this structure, the zinc powder as the densifying filler can be uniformly dispersed in the chloroprene rubber. In addition, the amount of zinc oxide contained in the zinc powder is
Mass production of high-density anti-vibration rubber that can be controlled and has desired physical properties
Can be manufactured well.

According to a sixth aspect of the present invention, in the method for producing a high-density anti-vibration rubber according to the fifth aspect , zinc powder having an average particle diameter of 3 to 10 μm is used. With this configuration
Therefore, mass productivity can be improved.

A seventh aspect of the present invention provides a method for producing a high-density vibration-isolating rubber, wherein the sulfenamide-based vulcanization retarder is used in the fifth aspect. According to this configuration, the acid
Even if the content of zinc oxide fluctuates, the manufacturing process can be performed efficiently.
Vulcanization on the way can be delayed.

FIG. 1 shows an embodiment of the present invention.
~ It demonstrates using FIG.

(Embodiment) FIGS. 1 to 3 show (Embodiment) of the present invention. In order to compare and examine a suitable blending ratio of the zinc powder to the chloroprene rubber when manufacturing the rubber composition, various blending ratios of each component are changed in Examples 1 to 3 and Comparative Examples 1 to 3 below. A rubber composition was prepared.

Example 1 As materials for the rubber composition, chloroprene rubber, zinc powder as a filler and a vulcanizing agent, a sulfenamide-based vulcanization retarder, magnesium oxide as a vulcanization aid, and a processing agent. Stearic acid as an auxiliary agent, carbon black SRF as a reinforcing agent, aroma oil as a softening agent, an antiaging agent, and an ester compound as a processing auxiliary agent are used, and the mixing ratios thereof are shown in Table 1. I did it.

[0026]

[Table 1]

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

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

In step 6, the compounded rubber thus obtained is processed into a ribbon shape, and after aging, the thickness is 5 to 8 mm and the width is 50 to 8 mm.
After forming into a 0 mm ribbon shape, at 195 ° C for 3 minutes,
Vulcanization treatment was performed to prepare a test piece, 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 according to the conventional method for measuring the spring hardness A type described in JIS-K6301, and the compression set was 100 ° C x 72h.
It was obtained under the condition of. The loss coefficient tan δ is defined by JIS
According to the method described in K6394, 15 Hz, amplitude 1.
It was measured under the condition of 0%.

[0031]

[Table 2]

Examples 2 and 3 The blending ratio of each component is shown in Table 1. And other than that, the test piece was created like Example 1 and various physical properties were measured.

The physical properties of the obtained test piece are shown in Table 2.

Further, the test piece prepared in Example 3 was used for 180 with a disc rheometer (manufactured by Toyo Seiki Seisakusho).
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 is for optimizing the vulcanization conditions of the rubber by continuously measuring the vulcanization state. That is,
A value M _E obtained by subtracting the minimum torque M _L from the final maximum torque M _H ∞ that is reached by being vulcanized is obtained. Next, t ₁₀ and t _{90 at} which 10% M _E and 90% M _E are obtained are obtained, and t ₉₀ and t ₁₀
And the difference Δt ₈₀ is calculated and used as an index of the vulcanization rate.

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

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 higher than the range of the present invention, and the remaining mixing ratio was as shown in Table 1. Other than that, the test piece was created like Example 1.

As is clear from Examples 1 to 3, when the mixing ratio of the 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, and elongation were able to reach practical levels.

The packing density of the zinc powder varies depending on the composition and particle size of the zinc powder, but in the present invention, the packing density of 6 to 7 g / cc is used to achieve the object of the present invention. It was possible to obtain high density rubber of 2.6 to 3.6 g / cc.

The zinc powder contains 92 to 97 wt% of metallic zinc as a filler and zinc oxide 3 as a vulcanizing agent.
-8 wt% and the balance of 1 wt% or less were used, so that even if metallic zinc and zinc oxide were mixed with chloroprene rubber at the same time, those having desired physical properties were obtained.

Further, zinc is currently used in various fields for the purpose of, for example, improving the corrosion resistance of steel sheets, and is not considered as a substance that pollutes the environment at this time.
Therefore, it is considered that even if the high-density anti-vibration rubber obtained in the above example is buried in the soil and disposed of, it does not pollute the environment.

On the other hand, as shown in Comparative Example 1, when the blending ratio of the zinc powder to the chloroprene rubber was too small, the hardness became low and the densification could not be achieved. In addition, when the anti-vibration characteristics of this rubber were measured in an actual machine test,
The desired vibration damping property was not obtained.

Further, as shown in Comparative Examples 2 and 3, if the blending ratio of the zinc powder to the chloroprene rubber is too high,
The hardness becomes too high and the flexibility becomes poor. That is, it becomes inferior in rubber elasticity such as tensile strength and elongation, and it becomes impossible to obtain a material that can withstand actual use.

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 make it 0 to 600 parts by weight. In addition, in Examples 1 to 3 above, the rubber composition was manufactured in the manufacturing process shown in FIG. 1. This is because the zinc powder in the present invention is an oxide that acts not only as a filler but also as a vulcanizing agent. This is because it contains zinc.

In such a zinc powder, the vulcanization reaction in which the 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 is a localized reaction. It is preferred because it is unlikely to occur. That is, it is preferable to add the vulcanization retarder in a step prior to mixing the zinc powder with the chloroprene rubber.

However, as shown in Examples 1 to 3 above,
It was found that when the amount of zinc oxide contained in the zinc powder is small, even if the zinc powder and the vulcanization retarder are simultaneously mixed in step 2, it does not cause a big problem.

Therefore, in the present invention, a vulcanization retarder is mixed with chloroprene rubber and then zinc powder is mixed to prepare a mixture, or a vulcanization retarder and zinc powder are simultaneously mixed with chloroprene rubber to obtain a mixture. By making the mixture into a ribbon shape, molding the mixture into a predetermined shape, and then vulcanizing the mixture, a high-density anti-vibration rubber in which zinc powder is uniformly dispersed in chloroprene rubber is prepared. Obtainable.

Next, in order to investigate the effect of the type of filler compounded in the chloroprene rubber, in Comparative Examples 4 and 5, rubber compositions other than zinc powder were used as fillers.

Comparative Example 4 Instead of the zinc powder of the present invention, litharge containing lead oxide as a main component, which has been conventionally used, is used as a filler.
The blending ratio of each component is 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 material rubber was masticated. Then, in step 2, materials other than the above-mentioned chloroprene rubber, vulcanizing agent, and vulcanization accelerator were mixed and kneaded, and in step 3, a masterbatch was prepared.

In step 4, a vulcanizing agent and a vulcanization accelerator were blended with the obtained masterbatch, and the mixture was kneaded to obtain a final blended rubber compound in step 5. In step 6, the compounded rubber obtained is processed into a ribbon shape, aged and then molded into a predetermined shape, and 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 pieces.

[0055]

[Table 4]

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

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

Comparative Example 4 shows an example of a high-density anti-vibration rubber that has been conventionally used, and its physical properties are almost the same as those of the high-density anti-vibration rubber of the present invention. However, unlike Examples 1 to 3 above, lead oxide as a filler does not function as a vulcanizing agent. Therefore, in order to uniformly disperse each component, as shown in FIG. 2, the materials other than the vulcanizing agent and the vulcanization accelerator are first compounded, and then the vulcanizing agent is added to the obtained masterbatch. It was necessary to mix with a sulfur accelerator, and the process became complicated.

Further, since it contains lead, there is a problem that lead is leached into the soil to pollute the environment when it is disposed of.
In Comparative Example 5, since iron powder was used as the filler, rubber properties such as tensile strength and elongation were inferior to those of the high-density anti-vibration rubber of the present invention obtained in Examples 1 to 3 above.

Further, probably because the iron powder has a poor adhesive bond with the chloroprene rubber, in a hot and humid atmosphere of 35 ° C. and a relative humidity of 90%, iron as a filler is easily oxidized and the iron rust state occurs. became.

For reference, when the high-density anti-vibration rubbers obtained in Examples 1 to 3 were exposed to the same high temperature and high humidity atmosphere, they did not change with time even after one month or more and were actually used. A high-density anti-vibration rubber suitable for was obtained.

Next, the influence of the composition of the zinc powder was investigated. 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 blending ratio of sulfenamide as a vulcanization retarder. A test piece was prepared in the same manner as in Example 3 except for the above.

[0064]

[Table 5]

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

[0066]

[Table 6]

Comparative Example 6 The composition of zinc powder and the blending ratio of the vulcanization retarder are shown in Table 5. That is, regarding 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. A test piece was prepared in the same manner as in Example 3 except for the above.

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

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, when the amount of the vulcanization retarder is too large, the vulcanization treatment, which is the final step, takes time, and the vulcanization treatment at 195 ° C. for 3 minutes provides sufficient vulcanization. There wasn't. As a result, Table 6
As shown in (1), not only the rubber properties such as tensile strength and elongation were deteriorated due to insufficient vulcanization, but also the compression set was increased. Although it is possible to improve the physical properties by taking a sufficient time for the vulcanization, it is not preferable because the mass productivity is deteriorated.

When the amount of zinc oxide contained in the zinc powder is large, the density of the antivibration rubber tends to decrease.
On the contrary, if the proportion of metallic zinc in the zinc powder is increased, vulcanization will be insufficient even at the end, so in order to obtain the desired physical properties,
It was necessary to mix zinc oxide (zinc white) into the final batch again, and the ratio of the amount of zinc oxide added to the chloroprene rubber finally became almost the same.

In consideration of the physical properties of the high-density anti-vibration rubber, mass production efficiency, cost, and ease of management, the composition of the zinc powder is 92 to 97% by weight of metallic zinc and 3 to 8% of zinc oxide. In the manufacturing method, it is preferable to simultaneously mix the zinc powder and the vulcanization retarder while adjusting the weight% and the balance to be 1% by weight or less.

In Examples 1 to 5, the 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, the fine particle components and the surface layer of the zinc powder will oxidize in the atmosphere during storage or kneading of the rubber, and will act as a vulcanizing agent for the rubber, causing it to flow before being processed into the prescribed shape. I lose my sex.

It is also possible to add a large amount of a vulcanization retarder in the compounding for the purpose of inhibiting this, but if too much vulcanization retarder is added, it will take time to sufficiently vulcanize in the final vulcanization step. It will take too much, and the mass productivity will decrease.

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 the zinc powder having an average particle diameter of 3 to 10 μm, and more preferably 5 to 8 μm. Even in this case, the amount of processing aid added increases as the average particle size increases,
Productivity needs to be optimized.

The density of the high-density anti-vibration rubber obtained in the present invention is 2.6 to 3.6 g / cc. The high-density anti-vibration rubber of the present invention must have the same physical properties as the conventional high-density anti-vibration rubber containing lead oxide as a filler obtained in Comparative Example 4. Therefore, if the density of the conventional high-density anti-vibration rubber becomes too small compared to the density of 3.4 g / cc, it is necessary to increase the volume of the anti-vibration rubber in order to obtain equivalent performance. Will occur.

Although the density is large, there is no problem due to it, but sufficient rubber properties such as tensile strength and elongation cannot be obtained, and the hardness is 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 and the repeatability in practical use becomes poor, and when the hardness is 60 ° or less, a desired performance can be obtained by the method of adding zinc powder as a filler. become unable.

As the vulcanization retarder used in the production of the high-density anti-vibration rubber, generally, sulfenamide-based compounds, phthalic anhydride, N-nitrosodiphenylamine, N-cyclohexylthiophthalimide are mentioned. In the present invention, even when the amount of zinc oxide contained in the zinc powder fluctuates, the sulfenamide-based vulcanization retarder can be preferably used because it can be dealt with so much without changing the addition amount.

The use of such a sulfenamide-based vulcanization retarder is accompanied by mass productivity such as an increase in the amount of zinc oxide during storage of zinc powder or a decrease in fluidity during storage of a masterbatch. It is effective in 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 used for accumulating the compressor suction side in the outdoor unit of the separate type air conditioner. Was used as a high-density anti-vibration rubber for fixing the. Then, vibration of 15 to 150 Hz was intentionally applied to confirm the vibration damping effect.

As a result, the same excellent effects as those of the conventional lead-based vibration damping rubber could be obtained with the zinc-based vibration damping 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 incorporating 7 g / cc of zinc powder. Also, a limited composition range
Chloroprene rubber by using zinc powder
At the same time as the vulcanization, it is possible to increase the density. In addition, other necessary physical properties such as loss coefficient, compression set, tensile strength, and elongation can be set to practical levels, and further environmental pollution can be prevented.

According to the second aspect of the invention, the ratio of metallic zinc to zinc oxide in the zinc powder can be easily controlled. Also, the molding fluidity is improved, and injection with excellent mass productivity can be applied.

According to the third and fourth 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 properties when closely fixed to a vibrating object. it can. Further, it is possible to obtain a vibration-proof rubber which has excellent durability and can be repeatedly used.

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

Further, by using the 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 anti-vibration rubber having desired physical properties can be manufactured with good mass productivity. be able to.

According to the sixth aspect of the present invention, by prescribing the average particle size of the zinc powder, it is possible to prevent excessive oxidation of metallic zinc, and to manufacture with good mass productivity. Further, according to the invention of claim 7, by selecting a sulfenamide type as the vulcanization retarder, even if the content rate of zinc oxide changes, it is possible to efficiently extract the thermal history from the thermal history during the production process. Vulcanization can be delayed.

The high-density anti-vibration rubber configured as described above is in close contact with a vibrating body attached to an electric appliance, an automobile, or other industrial machine, and fixes the vibrating body. It can be preferably used as a high-density anti-vibration rubber used for the purpose of anti-vibration and sound-proof of heat exchangers and the like.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

1 Raw material rubber 2 compounding materials, chemicals 3 compounded rubber

Front page continuation (72) Inventor Norimasa Kitamura 3-9-13 Higashi-Kobashi, Higashinari-ku, Osaka-shi, Osaka Inside Okayasu Rubber Co., Ltd. (72) Kazuo Yasuda 3-9-13 Higashi-Kobashi, Higashi-nari-ku, Osaka No. Okayasu Rubber Co., Ltd. (56) Reference JP-A-4-344230 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08L 11/00 C08K 3/08 C08K 3/18 -3/22 F16F 1/36 F16F 15/08

Claims (7)

(57) [Claims] 1. To 100 parts by weight of chloroprene rubber ,
92-97 wt% of metallic zinc as a filler and a vulcanizing agent
3-8% by weight of zinc oxide and the balance less than 1% by weight
A high-density anti-vibration rubber containing at least 300 to 600 parts by weight of zinc powder having a packing density of 6 to 7 g / cc. 2. The zinc powder has an average particle size of 3 to 10 μm.
The high-density anti-vibration rubber according to claim 1. 3. The rubber density measured by Archimedes method is
The high-density anti-vibration according to claim 1, which is 2.6 to 3.6 g / cc.
Rubber. 4. A spring hardness according to JIS-K6301.
The rubber hardness measured with a degree A is Hs 60 to 80 °
The high-density anti-vibration rubber according to claim 1. 5. At least chloroprene rubber and
92-97 wt% of metallic zinc as a vulcanizing agent and a vulcanizing agent
3 to 8 wt% of zinc oxide and the balance less than 1 wt%
Mixed raw material consisting of zinc powder and vulcanization retarder
When manufacturing high-density anti-vibration rubber, after mixing the vulcanization retarder with chloroprene rubber, zinc powder
To form a mixture, or chloroprene
A mixture obtained by simultaneously mixing a vulcanization retarder and zinc powder with rubber.
And the mixture is processed into a ribbon,
Manufacturing method for high-density anti-vibration rubber that is vulcanized after being molded into shape
Law. 6. The zinc powder has an average particle size of 3 to 10 μm.
The method for producing a high-density anti-vibration rubber according to claim 5, wherein 7. A sulfenamide-based vulcanization retarder is used.
The method for producing a high-density anti-vibration rubber according to claim 5 .