JP7257656B2 - Rubber composition for foam and anti-vibration gloves - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rubber composition for foams and anti-vibration gloves that can be used for work involving exposure to vibrations and reduce the damage.

As a conventional anti-vibration glove, a glove described in Patent Document 1 by the present applicant is known. The glove described in Patent Document 1 is a glove with anti-vibration performance that is mainly worn when using a vibrating tool such as a rock drill or an engine cutter. A vulcanized foamed rubber material is provided on the palm.

In addition, by forming grooves in the vulcanized foamed rubber material in the direction in which the fingers of the glove extend and in the direction orthogonal to this, and by forming the vulcanized foamed rubber material in a block shape, it has high vibration resistance and is easy to use. It is a glove with excellent durability.

The glove described in Patent Document 1 has the anti-vibration properties required for this type of product at the time of filing, and was also excellent in usability, so it can be used with vibrating tools such as rock drills and engine cutters. The user's burden was reduced.

JP-A-2004-339630

On the other hand, the international standard ISO 10819 regarding the measurement and evaluation method of the vibration reduction effect of anti-vibration gloves was revised in 2013, and the standard of vibration damping has become higher than before. Since conventional anti-vibration gloves do not meet the requirements of the above standards, anti-vibration gloves that meet the requirements of the standards have been desired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide anti-vibration gloves that can meet the requirements of the above standards. Another object of the present invention is to provide a foam rubber composition for ensuring the anti-vibration properties of the glove.

In order to achieve the above object, the rubber composition for foams of the present invention comprises 100 parts by mass of non-sulfur-modified chloroprene rubber, 1.0 to 3.0 parts by mass of a hydrazide-based organic foaming agent, and a single or a plurality of It is characterized by containing a total of 40 to 100 parts by mass of fillers and having a specific gravity of the single filler or a weighted average specific gravity of the plurality of fillers of 4.0 to 5.0.

Since the anti-vibration gloves described in Patent Document 1 did not satisfy the conditions of the above-mentioned international standards set later, the inventors of the present application conducted experiments by making various changes in the composition of the rubber material and filler. However, it was difficult to meet the requirements of the above international standards simply by following conventional foaming techniques.

As a result of further studies by the inventors of the present application, the rubber composition for foams, using a non-sulfur-modified chloroprene rubber as a rubber component and a predetermined amount of a hydrazide-based organic foaming agent as a foaming agent, has a rubber composition of 4.0 to 5.0 By blending a total of 40 to 100 parts by mass of a filler having a specific gravity or a plurality of fillers having a weighted average specific gravity of 4.0 to 5.0, when the rubber composition is foamed, the above international standard A foam for anti-vibration gloves that satisfies the conditions could be made.

Here, when the hydrazide-based organic foaming agent is less than 1.0, foaming becomes insufficient when foaming, and the specific gravity of the foam becomes high, resulting in poor vibration damping. On the other hand, when the hydrazide-based organic foaming agent exceeds 3.0, the foaming ratio becomes high and the specific gravity becomes low, so that the vibration damping property is also deteriorated. At the same time, the size of the air bubbles becomes non-uniform, and the proportion of open air bubbles increases, deteriorating the vibration-proof property and lowering the durability.

As for the filler, when the specific gravity or weight average specific gravity is less than 4.0 or exceeds 5.0, it is difficult to make a foam for anti-vibration gloves that satisfies the conditions of the above international standards. . Moreover, when the filler is less than 40 parts by mass, it is difficult to obtain the desired vibration damping properties when the foam is formed. On the other hand, when the filler exceeds 100 parts by mass, the ratio of the rubber component is lowered, which is not preferable because the strength, durability, and abrasion resistance of the resulting foam are lowered.

Moreover, in the rubber composition for foams of the present invention, the filler is preferably barium sulfate. Further, the filler may further contain aluminum oxide. When the inventors of the present application conducted various experiments using a filler having a predetermined specific gravity, it was found that barium sulfate was used, or barium sulfate was mixed with a predetermined amount of aluminum oxide or the like to form a foam. It was found that the desired vibration isolation can be obtained by

The rubber composition for foams of the present invention preferably contains 2 to 6 parts by mass of magnesium oxide and 3 to 7 parts by mass of zinc oxide as additives. When the non-sulfur-modified chloroprene rubber was used as the rubber component, by adding the above additives, it was possible to obtain the desired vibration damping properties when formed into a foam. Here, magnesium oxide used as an additive is produced by a light-burning method (light-burning magnesia).

Further, in order to achieve the above object, the anti-vibration glove of the present invention comprises 100 parts by mass of non-sulfur-modified chloroprene rubber and 1.0 to 3.0 parts by mass of a hydrazide organic foaming agent alone. Or, it is blended with 40 to 100 parts by mass of a plurality of fillers, the specific gravity of the single filler, or the weighted average specific gravity of the plurality of fillers is 4.0 to 5.0, and the specific gravity is 0. .3 to 0.5 foam is fixed to a glove body, wherein the foam is fixed to the palm of the glove body in the form of blocks spaced apart from each other. and a groove or space opening toward the palm side is formed in the foaming protrusion.

According to experiments conducted by the inventors of the present application, a foam having a specific gravity of 0.3 to 0.5 is used to form a block-shaped foam projection, and a groove opening toward the palm side is formed in the foam projection. Alternatively, the inventors have found that by forming a space, anti-vibration gloves that meet the conditions of the above international standards can be obtained. When the specific gravity of the foam is less than 0.3, vibrational energy absorption is insufficient, and when the specific gravity of the foam exceeds 0.5, vibrational energy in the low-frequency range is not sufficiently absorbed.

Moreover, in the anti-vibration glove of the present invention, the filler is preferably barium sulfate or a mixture of barium sulfate and aluminum oxide. By using such a composition for the foam, it is possible to obtain anti-vibration gloves with excellent anti-vibration properties and excellent durability.

In addition, it is preferable that the foam projection includes one in which the groove or space is opened in the end surface located on the outer shell of the glove body. According to this configuration, since the space is open at the end surface located on the outer shell of the glove body, the inside of the glove body communicates with the outside air through the space. Therefore, it is possible to improve the air permeability of the portion.

In the anti-vibration glove of the present invention, in the measurement of the vibration reduction effect of the anti-vibration glove, TRsM, which is the average vibration transmissibility of the vibration spectrum M in the frequency band from 25 Hz to 200 Hz, is less than 0.9, and , TRsH, which is the average vibration transmissibility of the vibration spectrum H in the frequency band from 200 Hz to 1250 Hz, is preferably less than 0.6.

According to the studies of the inventors of the present application, at least the rubber component is a non-sulphur-modified chloroprene rubber, and a foam having a specific gravity of 0.3 to 0.5 is placed on the palm of the glove body in blocks. By forming a foamed protrusion fixed by the foamed protrusion and forming a groove or space opening on the palm side in the foamed protrusion, it is possible to make a vibration-proof glove that meets the conditions of the above international standard (ISO 10819). did it.

ADVANTAGE OF THE INVENTION According to this invention, the rubber composition for foams which can satisfy|fill the conditions of the said international standard, and a vibration-proof glove using the same can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing anti-vibration gloves that are an example of an embodiment of the present invention; The side view seen from the II direction of FIG. FIG. 2 is a sectional view taken along line III-III of FIG. 1; Explanatory drawing which shows the manufacturing process of the anti-vibration glove of this embodiment.

Next, a rubber composition for foams and anti-vibration gloves, which are examples of embodiments of the present invention, will be described with reference to FIGS. 1 to 4. FIG. As shown in FIG. 1, the anti-vibration glove 1 of the present embodiment has a plurality of block-shaped foam protrusions 11 formed of foam 10 fixed to the surface of the palm portion 3 of the glove body 2 .

The glove body 2 is constructed by knitting threads made of fibers into a glove shape. The glove body 2 is often made of stretchable knitted fabric, and gloves that are widely used at present can be used.

As fibers, materials such as natural fibers such as cotton and hemp, and synthetic fibers such as nylon (registered trademark) and polyester can be used. The glove body 2 has a palm portion 3 for covering the palm of the operator, and a back portion 4 for covering the back of the hand (see FIGS. 2 and 3).

In the anti-vibration glove 1 of this embodiment, a plurality of foam protrusions 11 are provided in a block shape on the surface of the palm portion 3, and the foam protrusions 11 are fixed with a space therebetween. The foam protrusion 11 is configured such that when the worker grips the item, the foam protrusion 11 is interposed between the item and the worker's hand. Further, foam grooves 12 in which the foam 10 is firmly pressed against the palm 3 and fixed are formed between the foam protrusions 11 . Spacing is formed around each foaming protrusion 11 by the foaming groove 12 .

As shown in FIG. 2, the foam protrusion 11 is fixed to the surface of the palm 3 in an arch shape (U shape). Therefore, as shown in FIG. 2, when the glove main body 2 is viewed from the side, a substantially semicircular space 13 is opened on the side of each foam protrusion 11 .

Moreover, as shown in FIG. 3, the space 13 inside each foaming projection 11 is open to the palm portion 3 side. Since the foam 10 does not exist in the palm portion 3 facing the space 13, the space 13 communicates with the inside of the glove body 2 and the outside air due to the air permeability of the fabric of the glove body 2. - 特許庁

Next, the foam 10 forming the foam protrusions 11 and the foam grooves 12 will be described. The foam 10 in the present embodiment is formed by forming a rubber composition for foam into a sheet, temporarily fixing it to the glove body 2, and performing a cross-linking reaction and foaming in a heating furnace.

The rubber composition for the foam comprises 1.0 to 3.0 parts by mass of a hydrazide-based organic foaming agent per 100 parts by mass of non-sulfur-modified chloroprene rubber, and a single filler having a specific gravity of 4.0 to 5.0. It contains 40 to 100 parts by mass. Alternatively, the filler includes a mixture of a plurality of fillers with a weighted average specific gravity of 4.0 to 5.0.

As the filler, barium sulfate having a specific gravity of 4.49 is suitable. In addition to this barium sulfate, aluminum oxide (alumina) with a specific gravity of 3.95, or other fillers are included so that the final weighted average specific gravity of the filler is in the range of 4.0 to 5.0. may be In this case, in addition to aluminum oxide, aluminum nitride or magnesium oxide (dead-burnt magnesia) manufactured by a dead-burning method in a high temperature range exceeding 1500° C. may be used.

Here, the filler in the present embodiment is the same concept as a filler that has been widely used in the field of manufacturing rubber products. Specifically, it is a powder that does not directly participate in the cross-linking reaction of rubber and essentially does not have anti-oxidation properties for anti-aging. For example, as fillers, quartz powder, graphite powder, boron nitride, ferrites, antimony trioxide, titanium oxides, silver powder, etc. can be used in addition to the above substances.

Next, a method for manufacturing the anti-vibration glove 1 of this embodiment will be described with reference to FIG. First, a rubber composition for foam is compounded. First, to 100 parts by mass of non-sulfur-modified chloroprene rubber, 1.0 to 3.0 parts by mass, preferably 2.0 parts by mass of OBSH (p,p'-oxybisbenzenesulfonyl hydrazide) is added to 100 parts by mass of a hydrazide organic foaming agent. Add 5 parts by weight.

As a filler, 50 parts by mass of barium sulfate is added alone. In addition to this, as additives, 4 parts by mass of magnesium oxide, 5 parts by mass of zinc oxide, 1 part by mass of stearic acid, 20 parts by mass of naphthenic oil, 2 parts by mass of phenolic antioxidant, 1.5 parts by mass of vulcanization accelerator EU (ethylene thiourea) and 0.5 parts by mass of vulcanization accelerator MBTS (2-benzothiazyl disulfide) are added.

Next, these raw materials are kneaded in a kneader (not shown) to produce a compound (rubber composition for foam). Next, this compound is formed into a sheet having a thickness of 2.0 mm using a device such as a calender roll or an extruder. Next, this sheet is cut out according to the shape of the palm portion 3 of the glove body 2 to form the compound sheet 14 shown in FIG.

As shown in FIG. 4 , in manufacturing the anti-vibration glove 1 of the present embodiment, a press machine 20 is used to temporarily fix the compound sheet 14 to the glove body 2 . The press machine 20 has a press body 21 , an upper die 22 and a lower die 23 . The upper die 22 is formed with projections and depressions for forming the foaming projections 11 and the foaming grooves 12 on the compound sheet 14 (not shown). A concave portion 24 is formed in the lower mold 23 so as to match the shape of the glove body 2 .

In manufacturing the anti-vibration glove 1 of the present embodiment, the glove body 2 is attached to the flat hand mold 25 and supplied to the pressing machine 20 in the same manner as in the manufacturing method in Patent Document 1. At this time, the flat hand mold 25 is set at a predetermined position of the lower mold 23 with the palm portion 3 of the glove body 2 directed upward.

From this state, the compound sheet 14 is placed on the palm portion 3 of the glove body 2 , and the compound sheet 14 is temporarily fixed to the glove body 2 by pressing with the upper mold 22 from above. At this time, the temperature of the upper die 22 is 60-80° C., and the pressing pressure is about 392-588 kPa (4-6 kg/cm ² ). The pressing time is 15 to 60 seconds.

By this temporary fixation, the compound sheet 14 having unevenness is attached to the surface of the palm portion 3 of the glove body 2 . Next, the glove body 2 is removed from the flat hand mold 25 and attached to a three-dimensional hand mold (not shown) imitating the shape of a human hand.

After that, the glove body 2 to which the compound sheet 14 is temporarily fixed is introduced into a heating furnace (not shown), and heated in the heating furnace to cause a cross-linking reaction in the compound sheet 14, and the action of the foaming agent. The compound sheet 14 is made into the foam 10 by foaming. After that, the glove body 2 is removed from the three-dimensional hand mold to obtain the anti-vibration glove 1. - 特許庁

In a state where the compound sheet 14 is temporarily fixed to the glove body 2, part of the compound in the portion that becomes the foamed groove 12 after foaming is pressed into the fibers of the glove body 2 by the upper mold 22 and entangled with the fibers. Become. On the other hand, since pressure is not applied by the upper die 22 to the portion of the compound sheet 14 that will become the foam protrusion 11, the compound in that portion is just in contact with the surface of the fiber portion of the glove body 2. It has become.

Therefore, when the compound sheet 14 is crosslinked and foamed, the portion to be the foam protrusion 11 which is not subjected to pressure is greatly foamed and rises from the surface of the glove body 2 . Moreover, since the compound of the portion of the foam protrusion 11 is only in contact with the surface of the glove body 2, as shown in FIG. This space 13 communicates with the inner space of the glove body 2 because the palm portion 3 of the glove body 2 is made of fiber.

On the other hand, since a part of the compound of the foamed groove 12 is entangled with the fibers of the glove body 2 , even if the cross-linking/foaming reaction occurs, the foamed protrusion 11 does not swell. Therefore, the foaming groove portion 12 becomes a space surrounding the periphery of the foaming projection portion 11 .

The anti-vibration glove 1 of this embodiment is made by adjusting the material and the manufacturing process so that the specific gravity of the foam 10 is between 0.3 and 0.5. Moreover, by making the shape of the foam 10 as shown in FIGS. 2 and 3, it is possible to manufacture the anti-vibration glove 1 conforming to the international standard ISO10819 regarding the vibration reduction effect. In particular, since the specific gravity of the foam 10 greatly affects the resonance frequency of the foam 10, adjusting the specific gravity of the foam 10 in the anti-vibration glove 1 is important for improving anti-vibration properties.

If the specific gravity of the foam 10 is less than 0.3, the foam 10 is too light to sufficiently absorb vibrational energy. Conversely, when the specific gravity of the foam 10 exceeds 0.5, the foam 10 becomes heavy, so that the vibration energy absorption performance improves, but the vibration energy absorption in the low frequency range becomes insufficient.

On the other hand, in the outer shell portion of the glove body 2, the left and right side edges of the foam protrusion 11 in FIG. 1 are not blocked by the foam groove 12, as shown in FIG. It will be in a state of opening to With this configuration, the foam protrusions 11 located in the outer shell portion of the glove body 2, particularly the foam protrusions 11 in the portions corresponding to the fingers, are open to the inside of the glove body 2 and the outside air through the space 13, so that the air permeability is improved. gets better.

The anti-vibration glove 1 of the present embodiment satisfies ISO 10819 as will be described later, and has superior anti-vibration properties compared to conventional anti-vibration gloves, and can be used for vibrating tools such as rock drills and engine cutters. When worn during use, the excellent anti-vibration properties can greatly reduce the damage caused by exposure to vibrations.

In addition, in the anti-vibration glove 1 of the present embodiment, the surface of the glove body 2 where the space 13 provided inside each foam protrusion 11 is located is elastic because the foam 10 is not fixed. ing. For this reason, compared with the case where the foam protrusion 11 is solid, the portion of the knitted glove body 2 that can be freely expanded and contracted is increased.

Therefore, when the operator wears the anti-vibration glove 1, it becomes easier for the operator to grasp or extend the hand when operating a handle or a tool to be grasped during work, and a smaller force is required. Work can be performed, and workability can be improved.

In addition, the anti-vibration glove 1 of the present embodiment uses a non-sulfur-modified chloroprene rubber as a rubber component, adds the above-mentioned foaming agent, and fills with the above-mentioned filler. Abrasion resistance is improved compared to the vulcanized foamed rubber protrusions in the described anti-vibration gloves. Using a Martindale abrasion tester for measuring wear resistance, the anti-wear performance of anti-vibration glove 1 of this embodiment and the anti-vibration glove described in Patent Document 1 was measured.

As a result, the average of the three samples of the anti-vibration glove 1 of the present embodiment was about 213 times, while the anti-vibration glove described in Patent Document 1 averaged 104 times, which is higher than the conventional one. More than double the durability.

Furthermore, the anti-vibration glove 1 of the present embodiment uses a non-sulfur-modified chloroprene rubber as a rubber component, adds the above-mentioned foaming agent, and fills with the above-mentioned filler. Thermal conductivity is lower than the described anti-vibration gloves. For the measurement of thermal conductivity, we adopted the thin wire heating method, which is widely used in the rubber industry to measure thermal conductivity. A rapid thermal conductivity meter (for example, Kyoto Electronics Industry Co., Ltd.: QTM-500) was used as a measuring device to measure the thermal conductivity of a sheet-like foam 10 as a sample of 100 mm×50 mm×20 mm.

As a result, the thermal conductivity of the foam 10 in this embodiment was 9.98×10 ⁻² [W/(mK)] when the average of five samples was set to 0.250 A ² . , and was 8.37×10 ⁻² [W/(m·K)] when the set current value was 0.625 A ² . This is a suitable numerical value for this type of glove for high temperature work.

Therefore, the anti-vibration glove 1 of the present embodiment can be applied to gloves that require heat insulation, such as gloves for putting in and out of a high-temperature oven, gloves for moving a heated mold, and the like. Become. Thus, the anti-vibration glove 1 of this embodiment not only has anti-vibration performance, workability, breathability, and durability (abrasion resistance), but also has low thermal conductivity, which makes it difficult to handle hot objects. It is now possible to provide excellent gloves.

Next, Examples 1 to 6 and Comparative Examples 1 to 7 of the anti-vibration glove 1 of the present embodiment will be described with reference to Tables 1 to 4. Table 1 shows Examples 1 to 6 of the anti-vibration glove 1 of the present embodiment, Table 2 shows Comparative Examples 1 to 5, Table 3 shows Comparative Examples 6 and 7, and Table 4 shows damping values of each Example and Comparative Example. and evaluation.

In Example 1, as shown in Table 1, 100 parts by mass of chloroprene rubber “M-40” manufactured by Denka Co., Ltd. was prepared as the non-sulfur-modified chloroprene rubber. As an organic hydrazide blowing agent, 2.5 parts by mass of OBSH (p,p'-oxybisbenzenesulfonyl hydrazide) was prepared.

As a filler, 50 parts by mass of barium sulfate was prepared alone. Barium sulfate having an average particle size of 4.5 μm was used. As additives, 4 parts by mass of magnesium oxide and 5 parts by mass of zinc oxide were prepared.

Further, as additives, 1 part by mass of stearic acid, 20 parts by mass of naphthenic oil, and 2 parts by mass of phenolic antioxidant were prepared. Further, 1.5 parts by mass of EU (ethylene thiourea) as a vulcanization accelerator and 0.5 parts by mass of MBTS (2-benzothiazyl disulfide) as a vulcanization accelerator were prepared.

After these materials were kneaded by a kneader (not shown) to obtain a compound, this compound was formed into a sheet having a thickness of 2.0 mm by calendar rolls. In Example 1, in the pressing machine 20, the temperature of the upper die 22 was set to about 60° C., and the pressing pressure was set to 392 kPa (4 kg/cm ² ), and the pressing was performed for about 15 seconds.

After that, in a heating furnace (not shown), heating is performed at a temperature of about 160 ° C. for about 6 minutes to cause a cross-linking reaction in the compound sheet 14 and to foam it by the action of the foaming agent. The specific gravity of the foam 10 in Example 1 was 0.35.

In Example 1, as shown in FIG. 3, the height H of each foam protrusion 11 protruding from the surface of the glove body 2 is about 8 mm on average. The thickness T of the foam 10 of each foam protrusion 11 is about 3 to 4 mm on average.

In Example 2, 40 parts by mass of barium sulfate as a filler was used. Others are the same as those of the first embodiment. The specific gravity of the foam 10 in Example 2 was 0.33.

In Example 3, 100 parts by mass of barium sulfate as a filler was used. Others are the same as those of the first embodiment. The specific gravity of the foam 10 in Example 3 was 0.49.

In Example 4, p,p'-oxybisbenzenesulfonylhydrazide, which is a hydrazide-based organic foaming agent, was 1.0 parts by mass. Others are the same as those of the first embodiment. The specific gravity of the foam 10 in Example 4 was 0.44.

In Example 5, 3.0 parts by mass of p,p'-oxybisbenzenesulfonyl hydrazide, which is a hydrazide-based organic blowing agent, was used. Others are the same as those of the first embodiment. The specific gravity of the foam 10 in Example 5 was 0.31.

In Example 6, the filler was a mixture of 50 parts by weight of aluminum oxide and 20 parts by weight of barium sulfate, totaling 70 parts by weight. The weighted average specific gravity of the filler in Example 6 is 4.10. Others are the same as those of the first embodiment. The specific gravity of the foam 10 in Example 6 was 0.41.

Next, Comparative Examples 1 to 7 will be described with reference to Tables 2 to 4.

[Comparative Example 1]
In Comparative Example 1, sulfur-modified chloroprene rubber is used as the rubber component. Specifically, 100 parts by mass of chloroprene rubber “PM-40” manufactured by Denka Co., Ltd. was prepared. Others are the same as those of the first embodiment. The specific gravity of the foam in Comparative Example 1 was 0.25.

[Comparative Example 2]
In Comparative Example 2, 35 parts by mass of barium sulfate as a filler was used. Others are the same as those of the first embodiment. The specific gravity of the foam in Comparative Example 2 was 0.28.

[Comparative Example 3]
In Comparative Example 3, 105 parts by mass of barium sulfate as a filler was used. Others are the same as those of the first embodiment. The specific gravity of the foam in Comparative Example 3 was 0.51.

[Comparative Example 4]
In Comparative Example 4, the foaming agent was changed to ADCA (azodicarbonamide) instead of the hydrazide organic foaming agent. The blending amount was 2.5 parts by mass, which is the same as the hydrazide foaming agent in Example 1. Others are the same as those of the first embodiment. The specific gravity of the foam 10 in Comparative Example 4 was 0.17.

[Comparative Example 5]
In Comparative Example 5, 50 parts by mass of calcium carbonate (manufactured by Maruo Calcium Co., Ltd.: MSK-C) having a specific gravity of 3.34 was used as the filler. Others are the same as those of the first embodiment. The specific gravity of the foam in Comparative Example 5 was 0.25.

[Comparative Example 6]
In Comparative Example 6, natural rubber is used as the rubber component. Specifically, SMR-5 (Standard Malaysian Rubber) was used. Along with this, 0.6 parts by mass of DPG (N,N'-diphenylguanidine), which is a guanidine-based vulcanization accelerator, was used instead of EU as a vulcanization accelerator. Also, the amount of the vulcanization accelerator MBTS was set to 1.8 parts by mass. Further, 0.4 parts by mass of vulcanization accelerator TMTM (tetramethylthiuram monosulfide) and 1.5 parts by mass of sulfur were added. Others are the same as those of the first embodiment. The specific gravity of the foam in Comparative Example 6 was 0.26.

[Comparative Example 7]
In Comparative Example 7, 30 parts by mass of the non-sulfur-modified chloroprene rubber, which is the rubber component of Example 1, was mixed with 70 parts by mass of SMR-5, which is a natural rubber. Along with this, as vulcanization accelerators, the vulcanization accelerator DPG is 0.6 parts by mass, the vulcanization accelerator MBTS is 1.8 parts by mass, and the vulcanization accelerator TMTM is 0.4 parts by mass. , and 1.05 parts by mass of sulfur were added. Others are the same as those of the first embodiment. The specific gravity of the foam in Comparative Example 7 was 0.21.

For Examples 1 to 6 and Comparative Examples 1 to 7, Table 4 summarizes the attenuation values measured according to ISO 10819 and whether or not the standard values are satisfied. In Table 4, TRsM is the average vibration transmissibility of the vibration spectrum M in the frequency band from 25 Hz to 200 Hz. TRsH is the average vibration transmissibility of the vibration spectrum H in the frequency band from 200 Hz to 1250 Hz.

As shown in Table 4 below, in Examples 1 to 6, the attenuation values measured in accordance with ISO 10819 satisfy the standard values of TRsM and TRsH. On the other hand, in Comparative Examples 1 to 7, although some TRsM cleared the reference value (Comparative Examples 2, 4, and 5), all TRsH did not clear. As described above, the anti-vibration gloves 1 of Examples 1 to 6 of the present invention have cleared the standard value of ISO10819, and have been proved to have high anti-vibration performance.

In the above embodiment, the foam 10 is provided only on the glove main body 2, but the foam 10 may be provided on the outer shell portion of the glove main body 2 and the back portion 4 as well. Moreover, the anti-vibration glove 1 of the present invention clears the standard values of ISO10819, but also clears the standard values of JIS T8114, which was revised accordingly.

Further, in the above-described embodiment, a semicircular space 13 is formed inside the foaming protrusion 11 when viewed from the side. It may have a shape such as Even with such a groove, it is possible to enhance the cushioning property of the foamed protrusion 11 and improve the vibration isolation performance.

DESCRIPTION OF SYMBOLS 1... Vibration-proof glove, 2... Glove body, 3... Palm part, 4... Back part, 10... Foam body, 11... Foam protrusion, 12... Foam groove part, 13... Space, 14... Compound sheet, 20... Press machine , 21... Press body, 22... Upper die, 23... Lower die, 24... Concave part, 25... Flat hand die.

Claims (8)

For 100 parts by mass of non-sulfur-modified chloroprene rubber,
1.0 to 3.0 parts by mass of a hydrazide-based organic blowing agent;
A total of 40 to 100 parts by mass of a single or multiple fillers,
A rubber composition for a foam, wherein the specific gravity of the single filler or the weighted average specific gravity of the plurality of fillers is 4.0 to 5.0. 2. The rubber composition for foam according to claim 1, wherein said filler is barium sulfate. 3. The rubber composition for foam according to claim 2, wherein the filler further contains aluminum oxide. 4. The rubber composition for foam according to any one of claims 1 to 3, further comprising 2 to 6 parts by mass of magnesium oxide and 3 to 7 parts by mass of zinc oxide as additives. The rubber component is obtained by blending 1.0 to 3.0 parts by mass of a hydrazide-based organic foaming agent and 40 to 100 parts by mass of a single or multiple fillers with 100 parts by mass of non-sulfur-modified chloroprene rubber. The specific gravity of a single filler or the weighted average specific gravity of the plurality of fillers is 4.0 to 5.0 , and a foam having a specific gravity of 0.3 to 0.5 is fixed to the glove body. Anti-vibration gloves,
The foam has foam protrusions fixed to the palm portion of the glove body in a block shape with a space therebetween, and the foam protrusions are formed with grooves or spaces opening toward the palm portion. An anti-vibration glove characterized by: 6. Anti-vibration glove according to claim 5 , characterized in that the filler is barium sulfate or a mixture of barium sulfate and aluminum oxide. 7. The anti-vibration glove according to claim 5 or 6 , wherein the foam protrusion includes one in which the groove or space is opened in an end face located on the outer contour of the glove body. In measuring the vibration reduction effect of the anti-vibration gloves,
TRsM, which is the average vibration transmissibility of the vibration spectrum M in the frequency band from 25 Hz to 200 Hz, is less than 0.9,
8. The anti-vibration glove according to any one of claims 5 to 7 , wherein TRsH, which is an average transmissibility of vibration of vibration spectrum H in a frequency band from 200 Hz to 1250 Hz, is less than 0.6.

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