CN105924703A - Generator damping pad for electric power and preparing method of generator damping pad - Google Patents

Generator damping pad for electric power and preparing method of generator damping pad Download PDF

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Publication number
CN105924703A
CN105924703A CN201610301370.8A CN201610301370A CN105924703A CN 105924703 A CN105924703 A CN 105924703A CN 201610301370 A CN201610301370 A CN 201610301370A CN 105924703 A CN105924703 A CN 105924703A
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parts
rubber
electric power
power generator
shock pad
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郭秀珍
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a generator damping pad for electric power. The damping pad is prepared from, by weight, 40-60 parts of butadiene styrene rubber, 20-40 parts of chloroprene rubber, 23-26 parts of fluoroether rubber, 0.1-15 parts of graphene, 13-15 parts of phenolic resin, 1-10 parts of a silane coupling agent, 12-15 parts of semi-reinforcing furnace black, 10-12 parts of roasted pottery clay, 6-12 parts of Kevlar chopped fibers subjected to surface treatment, 1-10 parts of carbon black, 5-7 parts of nanometer molybdenum disulfide (MoS2), 1-10 parts of an anti-aging agent, 4-8 parts of zinc oxide and 1-5 parts of an accelerator. Butadiene styrene rubber, chloroprene rubber and fluoroether rubber serve as the main materials of the generator damping pad, and thus the prepared generator damping pad is resistant to abrasion and high temperatures and low in noise and has excellent impact resistance and abrasion resistance.

Description

A kind of electric power generator shock pad and preparation method thereof
Technical field
The present invention relates to a kind of electric power generator shock pad and preparation method thereof, belong to electrical equipment technical field.
Background technology
In some cases, the generation of vibration can serve adverse effect by band, and such as, machine vibration can produce noise, increase energy Consumption, in order to reduce these adverse effects, generally to use some damping elements to isolate the transmission of vibration and to absorb what vibration caused Impact.Cushion is most commonly seen a kind of damping element, and it is normally used as support member or connector, is widely used in various In plant equipment, vehicle, bridge and building.Rubber has good effectiveness in vibration suppression because of its high resiliency, therefore by as main Damping material.Existing Rubber shock-absorbing pad during the use of some bigger electromechanical equipments of vibration, the wearability shown Can be the most poor with creep resistance, shorten the service life of cushion.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of electric power generator shock pad.
Technical scheme is as follows:
A kind of electric power generator shock pad, the raw material components of cushion is as follows, is weight portion:
Butadiene-styrene rubber 40-60 part, neoprene 20-40 part, fluoroether rubber 23-26 part, Graphene 0.1-15 part, phenolic aldehyde tree Fat 13-15 part, silane coupler 1-10 part, semi-reinforcing furnace black 12-15 part, calcinated argil 10-12 part is surface treated Kev draws chopped strand 6～12 parts, white carbon black 1-10 part, nano molybdenum disulfide (MoS2) 5-7 part, age resistor 1-10 part, oxidation Zinc 4～8 parts, accelerator 1-5 part.
Currently preferred, semi-reinforcing furnace black, the particle diameter of calcinated argil are 80-90nm.
Currently preferred, described butadiene-styrene rubber is newborn poly-butylbenzene, the trade mark 1502.
Currently preferred, described silane coupler is Si69, Si747, KH550, KH560, KH570；Preferably, Described silane coupler is Si69.
Currently preferred, described age resistor is amines antioxidants or phenol antiager, it is preferred that described age resistor is right Phenylenediamine derivative class age resistor.
Currently preferred, described accelerator is dithio tetrabutyl thiuram.
Currently preferred, the particle diameter of white carbon black is more than 250nm, and further, white carbon black is fast extrusion white carbon black N990.
Currently preferred, described surface treated Kev draws chopped strand, is that Kev draws chopped strand put into percent mass Ratio is in the methacrylic solution of 30%, takes out and clean and obtain in drying in oven, Kev after impregnating 35～40 minutes Draw chopped strand diameter 18um～25um, fibre length 3～5mm.
The preparation method of above-mentioned cushion, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 1-5 hour prepared molybdenum bisuphide suspension of ultrasonic stripping； Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: (1-15): 100, unit: g/ml；
(2) preheating banbury to 70-80 DEG C, puts into banbury by butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin Middle banburying 22-24min obtains rubber major ingredient, during play triangle bag 5-8 time, the rubber major ingredient obtained is cooled to 30-35 DEG C, Add the molybdenum bisuphide suspension that step (1) prepares, be uniformly mixed, obtain mixture A；
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene, Reflux 30-40 minute, filter to obtain solid mixture；The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are (8-10): (2-5)；
(4) solid mixture step (3) obtained uses hot nitrogen to dry up, and is transferred in reactor, is subsequently adding graphite Alkene, semi-reinforcing furnace black, calcinated argil, white carbon black, surface treated Kev draw chopped strand, silane coupler, at indifferent gas It is heated to 50-60 DEG C under the atmosphere of body protection, stirring reaction 120-150 minute, obtain intermedium；
(5) in the intermedium obtained, add age resistor, zinc oxide, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue Temperature 90-100 DEG C, refines 20-30 minute glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, after sulfuration Goods take out, on request finishing after and get final product.
Currently preferred, in step (4), the temperature of described hot nitrogen is 70-80 DEG C, and described noble gas is nitrogen or argon Gas, the mixing speed of stirring reaction is 80-100 rev/min.
Currently preferred, in step (5), the condition of sulfuration is for vulcanize at twice, and primary vulcanization temperature is 180-190 DEG C, cure time 10-20 minute, then heat to 220-240 DEG C, carry out second time and vulcanize, during second time sulfuration Between be 7-10 minute.
The generator shock pad of the present invention is using butadiene-styrene rubber, butadiene rubber, fluoroether rubber as major ingredient so that the damping of the present invention Pad possesses wear-resistant, high temperature resistant, low noise and the shock resistance of excellence, wearability；Butadiene-styrene rubber, neoprene, fluoroether rubber Under the cooperation of phenolic resin, compound merges, and adds silane coupler simultaneously, makes to form firm C-C key between rubber molecule and go forward side by side One step constitutes " network structure ", and on fluoroether rubber molecular backbone, carbon atom link fluorine atom forms that bond length is short, the great C-F of bond energy Key, and fluorine atom surrounds C-C major key thick and fast, protection main chain is not impacted, is destroyed further, adds surface treated Kev draws the protection of chopped strand, makes the present invention have concurrently relatively while possessing high wear resistance, high temperature resistant and good shock resistance Good elasticity, intensity and the function of minimizing noise；There is between molybdenum bisuphide lamella more weak Van der Waals force (lubrication), pole Easily rive absorption frictional force so that the direct friction between rubber and rubber reforms into the indirect friction between lamella, thus improves The wearability of rubber；Coordinate Graphene, the absorption sulfuration of Graphene large scale lamellar structure simultaneously, extend time of scorch, improve chlorine The process safety of buna, coordinating between molybdenum bisuphide with Graphene, makes intermolecular more firm, closely knit, makes wearability Further enhancing, semi-reinforcing furnace black and calcinated argil are as reinforcing agent, it is possible to " network structure " being sufficient filling with between rubber molecule In, drastically increase the anti-wear performance of cushion further.The use of silane coupler Si-69, can not only promote above-mentioned Reinforcing filler is evenly distributed in " network structure " between the rubber molecule of the present invention, meanwhile, it is capable to coordinate accelerator shape Become vulcanizing system, improve vulcanization characteristics, hot nitrogen dry up make Graphene, semi-reinforcing furnace black, calcinated argil, zinc oxide, through table The Kev that face processes draws the contact area between chopped strand, silane coupler and rubber to increase, and the most each plays and each makees With and component between reciprocity, make cushion possess wear-resistant, high temperature resistant, low noise and the shock resistance of excellence, wearability. In " network structure " between rubber molecule under the protection of silane coupler Si-69, reinforcing filler, surface treated triumphant Husband draws chopped strand to play maximum effect, makes wearability and reduction noise can reach ultimate attainment.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described, but is not limited to this.
The raw materials used convenient source that is, commercial products in embodiment.
Embodiment 1
A kind of electric power generator shock pad, the raw material components of cushion is as follows, is weight portion:
42 parts of butadiene-styrene rubber, neoprene 35 parts, fluoroether rubber 25 parts, Graphene 5 parts, 14 parts of phenolic resin, silane Coupling agent Si69 7 parts, semi-reinforcing furnace black 14 parts, calcinated argil 11 parts, surface treated Kev draws chopped strand 8 parts, White carbon black 3 parts, nano molybdenum disulfide (MoS2) 6 parts, 3 parts of p-phenylene diamine derivative's class age resistor, zinc oxide 5 parts, dithio Tetrabutyl thiuram 2 parts.
Described surface treated Kev draws chopped strand, be Kev is drawn chopped strand put into mass percent be the methyl of 30% In acrylic acid amides solution, taking out and clean and obtain in drying in oven after impregnating 35～40 minutes, Kev draws chopped strand diameter 18um～25um, fibre length 3～5mm.
The preparation method of above-mentioned cushion, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 3 hours prepared molybdenum bisuphide suspensions of ultrasonic stripping； Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: 12:100, unit: g/ml；
(2) preheating banbury to 78 DEG C, puts into butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin in banbury Banburying 22min obtains rubber major ingredient, during play triangle bag 6 times, the rubber major ingredient obtained is cooled to 32 DEG C, add step (1) The molybdenum bisuphide suspension prepared, is uniformly mixed, obtains mixture A；
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene, Reflux 32 minutes, filter to obtain solid mixture；The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are 4:1；
(4) hot nitrogen that solid mixture step (3) obtained uses temperature to be 78 DEG C dries up, and is transferred in reactor, Be subsequently adding Graphene, semi-reinforcing furnace black, calcinated argil, white carbon black, surface treated Kev draw chopped strand, silane coupled Agent, is heated to 55 DEG C under the atmosphere of nitrogen protection, hastens to stir reaction 140 minutes, in obtaining with the stirring of 90 revs/min Between thing；
(5) in the intermedium obtained, add age resistor, zinc oxide, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue Temperature 98 DEG C, refines 25 minutes glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, and the condition of sulfuration is for dividing two Secondary vulcanizing, primary vulcanization temperature is 185 DEG C, cure time 15 minutes, then heats to 230 DEG C, carries out second time Sulfuration, cure time is 8 minutes for the second time.Will sulfuration after goods take out, on request finishing after and get final product.
Embodiment 2
A kind of electric power generator shock pad, the raw material components of cushion is as follows, is weight portion:
58 parts of butadiene-styrene rubber, neoprene 22 parts, fluoroether rubber 23 parts, Graphene 7 parts, 13 parts of phenolic resin, silane Coupling agent Si69 5 parts, semi-reinforcing furnace black 12 parts, calcinated argil 10 parts, surface treated Kev draws chopped strand 7 parts, White carbon black 2 parts, nano molybdenum disulfide (MoS2) 5 parts, 5 parts of p-phenylene diamine derivative's class age resistor, zinc oxide 4 parts, dithio Tetrabutyl thiuram 3 parts.
Described surface treated Kev draws chopped strand, be Kev is drawn chopped strand put into mass percent be the methyl of 30% In acrylic acid amides solution, taking out and clean and obtain in drying in oven after impregnating 35～40 minutes, Kev draws chopped strand diameter 18um～25um, fibre length 3～5mm.
The preparation method of above-mentioned cushion, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 1-5 hour prepared molybdenum bisuphide suspension of ultrasonic stripping； Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: 1:10, unit: g/ml；
(2) preheating banbury to 72 DEG C, puts into butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin in banbury Banburying 24min obtains rubber major ingredient, during play triangle bag 6 times, the rubber major ingredient obtained is cooled to 30 DEG C, add step (1) The molybdenum bisuphide suspension prepared, is uniformly mixed, obtains mixture A；
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene, Reflux 30-40 minute, filter to obtain solid mixture；The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are 5:1；
(4) hot nitrogen that solid mixture step (3) obtained uses temperature to be 75 DEG C dries up, and is transferred in reactor, Be subsequently adding Graphene, semi-reinforcing furnace black, calcinated argil, white carbon black, surface treated Kev draw chopped strand, silane coupled Agent, is heated to 54 DEG C under the atmosphere of nitrogen protection, hastens to stir reaction 145 minutes, in obtaining with the stirring of 88 revs/min Between thing；
(5) in the intermedium obtained, add age resistor, zinc oxide, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue Temperature 95 DEG C, refines 25 minutes glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, and the condition of sulfuration is for dividing two Secondary vulcanizing, primary vulcanization temperature is 188 DEG C, cure time 12 minutes, then heats to 220 DEG C, carries out second time Sulfuration, cure time is 10 minutes for the second time.Will sulfuration after goods take out, on request finishing after and get final product.

Claims (10)

1. an electric power generator shock pad, the raw material components of cushion is as follows, is weight portion:
Butadiene-styrene rubber 40-60 part, neoprene 20-40 part, fluoroether rubber 23-26 part, Graphene 0.1-15 part, phenolic aldehyde tree Fat 13-15 part, silane coupler 1-10 part, semi-reinforcing furnace black 12-15 part, calcinated argil 10-12 part is surface treated Kev draws chopped strand 6～12 parts, white carbon black 1-10 part, nano molybdenum disulfide (MoS2) 5-7 part, age resistor 1-10 part, oxidation Zinc 4～8 parts, accelerator 1-5 part.
Electric power generator shock pad the most according to claim 1, it is characterised in that semi-reinforcing furnace black, calcinated argil Particle diameter is 80-90nm, and described butadiene-styrene rubber is newborn poly-butylbenzene, the trade mark 1502.
Electric power generator shock pad the most according to claim 1, it is characterised in that described silane coupler be Si69, Si747、KH550、KH560、KH570；Preferably, described silane coupler is Si69.
Electric power generator shock pad the most according to claim 1, it is characterised in that described age resistor is that amine is anti-old Agent or phenol antiager, it is preferred that described age resistor is p-phenylene diamine derivative's class age resistor.
Electric power generator shock pad the most according to claim 1, it is characterised in that described accelerator is dithio four Butyl thiuram.
Electric power generator shock pad the most according to claim 1, it is characterised in that the particle diameter of white carbon black is more than 250nm, Further, white carbon black is fast extrusion white carbon black N990.
Electric power generator shock pad the most according to claim 1, it is characterised in that described surface treated Kev draws Chopped strand, be Kev is drawn chopped strand put into mass percent be 30% methacrylic solution in, dipping 35～ Taking out after 40 minutes and clean and obtain in drying in oven, Kev draws chopped strand diameter 18um～25um, fibre length 3～ 5mm。
8. a preparation method for the cushion described in claim 1, step is as follows:
(1) molybdenum bisuphide is joined in N-Methyl pyrrolidone, through 1-5 hour prepared molybdenum bisuphide suspension of ultrasonic stripping； Molybdenum bisuphide with the mass volume ratio of N-Methyl pyrrolidone is: (1-15): 100, unit: g/ml；
(2) preheating banbury to 70-80 DEG C, puts into banbury by butadiene-styrene rubber, neoprene, fluoroether rubber, phenolic resin Middle banburying 22-24min obtains rubber major ingredient, during play triangle bag 5-8 time, the rubber major ingredient obtained is cooled to 30-35 DEG C, Add the molybdenum bisuphide suspension that step (1) prepares, be uniformly mixed, obtain mixture A；
(3) mixture A is joined in reflux, adds hexamethylene, be uniformly mixed, be heated to reflux hexamethylene, Reflux 30-40 minute, filter to obtain solid mixture；The addition of hexamethylene and the mass ratio of butadiene-styrene rubber are (8-10): (2-5)；
(4) solid mixture step (3) obtained uses hot nitrogen to dry up, and is transferred in reactor, is subsequently adding graphite Alkene, semi-reinforcing furnace black, calcinated argil, white carbon black, surface treated Kev draw chopped strand, silane coupler, at indifferent gas It is heated to 50-60 DEG C under the atmosphere of body protection, stirring reaction 120-150 minute, obtain intermedium；
(5) in the intermedium obtained, add age resistor, zinc oxide, accelerator, proceed to after mix homogeneously in rubber mixing machine, refine glue Temperature 90-100 DEG C, refines 20-30 minute glue time, and discharging after sulfuration in vulcanizer put into by the sizing material after refining glue, after sulfuration Goods take out, on request finishing after and get final product.
The preparation method of cushion the most according to claim 8, it is characterised in that in step (4), described hot nitrogen Temperature be 70-80 DEG C, described noble gas is nitrogen or argon, stirring reaction mixing speed be 80-100 rev/min.
The preparation method of cushion the most according to claim 8, it is characterised in that in step (5), the condition of sulfuration For vulcanizing at twice, primary vulcanization temperature is 180-190 DEG C, and cure time 10-20 minute then heats to 220-240 DEG C, carrying out second time and vulcanize, cure time is 7-10 minute for the second time.
CN201610301370.8A 2016-05-09 2016-05-09 Generator damping pad for electric power and preparing method of generator damping pad Pending CN105924703A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210002466A1 (en) * 2018-03-23 2021-01-07 Bando Chemical Industries, Ltd. Crosslinked rubber composition

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104329400A (en) * 2014-10-13 2015-02-04 杭州桑拉科技有限公司 Friction brake disc for marine electromagnetic clutch motor and method for preparing friction drag material layer of friction brake disc
CN104761767A (en) * 2015-03-28 2015-07-08 安徽微威胶件集团有限公司 Shock absorber rubber
CN104788747A (en) * 2015-04-17 2015-07-22 柳州市乾阳机电设备有限公司 Preparation method of wear-resisting rubber cushion
CN105017587A (en) * 2015-07-06 2015-11-04 安徽创宇电力设备有限公司 Tear-resistant and wear-resistant flame-retardant insulator
CN105367832A (en) * 2013-11-29 2016-03-02 郑州思辩科技有限公司 Rubber used for generator shock pad
CN105419180A (en) * 2015-11-27 2016-03-23 安徽锦洋氟化学有限公司 High-performance fluorine rubber composite material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105367832A (en) * 2013-11-29 2016-03-02 郑州思辩科技有限公司 Rubber used for generator shock pad
CN104329400A (en) * 2014-10-13 2015-02-04 杭州桑拉科技有限公司 Friction brake disc for marine electromagnetic clutch motor and method for preparing friction drag material layer of friction brake disc
CN104761767A (en) * 2015-03-28 2015-07-08 安徽微威胶件集团有限公司 Shock absorber rubber
CN104788747A (en) * 2015-04-17 2015-07-22 柳州市乾阳机电设备有限公司 Preparation method of wear-resisting rubber cushion
CN105017587A (en) * 2015-07-06 2015-11-04 安徽创宇电力设备有限公司 Tear-resistant and wear-resistant flame-retardant insulator
CN105419180A (en) * 2015-11-27 2016-03-23 安徽锦洋氟化学有限公司 High-performance fluorine rubber composite material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210002466A1 (en) * 2018-03-23 2021-01-07 Bando Chemical Industries, Ltd. Crosslinked rubber composition
US11566124B2 (en) * 2018-03-23 2023-01-31 Bando Chemical Industries, Ltd. Crosslinked rubber composition

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