US20170335095A1 - Anti-vibration rubber - Google Patents

Anti-vibration rubber Download PDF

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Publication number
US20170335095A1
US20170335095A1 US15/525,889 US201615525889A US2017335095A1 US 20170335095 A1 US20170335095 A1 US 20170335095A1 US 201615525889 A US201615525889 A US 201615525889A US 2017335095 A1 US2017335095 A1 US 2017335095A1
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Prior art keywords
vibration
rubber
vibration rubber
inclusive
loss factor
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Inventor
Toshio Saito
Hiroyuki Maruko
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Yamauchi Corp
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Yamauchi Corp
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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
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • C08L23/283—Halogenated homo- or copolymers of iso-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L11/00—Compositions of homopolymers or copolymers of chloroprene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
    • C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • 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
    • C08L9/02—Copolymers with acrylonitrile
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/12—Casings; Tubs
    • D06F39/125—Supporting arrangements for the casing, e.g. rollers or legs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/3605—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by their material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/373—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by having a particular shape
    • F16F1/3732—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by having a particular shape having an annular or the like shape, e.g. grommet-type resilient mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2224/00—Materials; Material properties
    • F16F2224/02—Materials; Material properties solids
    • F16F2224/025—Elastomers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/001—Specific functional characteristics in numerical form or in the form of equations
    • F16F2228/005—Material properties, e.g. moduli
    • F16F2228/007—Material properties, e.g. moduli of solids, e.g. hardness

Definitions

  • the present invention relates to anti-vibration rubbers, and more particularly to anti-vibration rubbers for washing machines.
  • Washing machines have leg rubbers, which are made of an elastic body, at the four corners of their bottom surfaces for reduced vibration and improved ease of installation.
  • Examples of such washing machines include drum-type washing machines described in Japanese Unexamined Patent Application Publication Nos. 2006-204715 (Patent Literature 1) and H11-164986 (Patent Literature 2).
  • a drum-type washing machine 1 disclosed in Patent Literature 1 includes: an outer cabinet 4 that has a base 3 at the bottom; a wash tub 6 that is accommodated in the outer cabinet 4 and is elastically supported on its lower side by anti-vibration means; and a spin tub 8 (drum) that is accommodated in the wash tub 6 and is driven to turn by drive means.
  • the spin tub 8 functions as a common tub for wash, rinse, spin, and dry cycles.
  • the drum-type washing machine of Patent Literature 1 has elastic leg rubbers 31 attached to the four corners of the base 3 .
  • a drum-type washing machine 2 of Patent Literature 2 uses a structure in which a wash tub 6 accommodating a spin tub 8 is suspended from an outer cabinet 4 by spring bodies 11 .
  • the drum-type washing machine 2 further has an anti-vibration damper 12 in order to reduce vibration when a dry cycle is started.
  • the drum-type washing machine of Patent Literature 2 also has leg rubbers 31 under fixed legs fixed to the bottom of the outer cabinet 4 .
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2006-204715
  • Patent Literature 2 Japanese Unexamined Patent Application Publication No. H11-164986
  • the drum-type washing machine disclosed in Patent Literature 1 has a structure that is effective when expected installation locations are in buildings with low stiffness such as Japanese-style houses with wooden structures and when vibration and noise are desired to be reduced.
  • the drum-type washing machine disclosed in Patent Literature 2 has a more standard structure than Patent Literature 1, and this structure is common in the world market.
  • the drum-type washing machine operates with action and spin speed corresponding to each cycle (wash, rinse, spin, and dry).
  • the spin speed of the drum need be increased for the spin cycle because as large a centrifugal force as possible is required to squeeze out as much water as possible.
  • recent washing machines are used in the region from the start of the dry cycle (spin speed: 0 rpm) to their maximum spin speed (e.g., 1,800 rpm), and the washing machines always go through an intermediate region thereof when they are started and stopped.
  • the washing machines are therefore temporarily used in this intermediate region.
  • the body (outer cabinet) of the washing machine may resonate with the spin speed of the drum in a region where the spin speed of the drum matches the natural frequency of the body of the washing machine, which amplifies vibration.
  • Patent Literature 1 elastic auxiliary legs are further attached between the leg rubbers in the four corners in order to restrain vibration and noise.
  • the leg rubbers formed by combination of a low hardness, low resilience rubber member and a high hardness rubber member are used in order to prevent an increase in vibration in the spin cycle.
  • vibration is not sufficiently reduced by the techniques disclosed in Patent Literatures 1 and 2.
  • the inventors looked at the fact that anti-vibration rubbers for washing machines are used in the temperature range of ⁇ 10° C. to 40° C., both inclusive, and conceived that vibration can be reduced by increasing a loss factor, which is an index of vibration energy absorption, in this temperature range.
  • the inventors arrived at the idea that, for washing machines with a natural frequency in a high frequency region close to their maximum spin speed, vibration can be reduced by implementing an anti-vibration rubber having a high loss factor in the high frequency region, and thus completed the invention.
  • An anti-vibration rubber of the present invention is an anti-vibration rubber for washing machines.
  • the anti-vibration rubber In temperature variance measurement of dynamic viscoelasticity at a frequency of 30 Hz, the anti-vibration rubber has a maximum loss factor at a temperature of ⁇ 10° C. to 40° C., both inclusive, and has a loss factor of 0.4 or more in an entire temperature range of ⁇ 10° C. to 40° C., both inclusive, at the frequency of 30 Hz.
  • the anti-vibration rubber of the present invention has a maximum loss factor within the temperature range of ⁇ 10° C. to 40° C., both inclusive, a high loss factor can be maintained in the temperature range in which the anti-vibration rubber for washing machines is used. Since the anti-vibration rubber has a loss factor of 0.4 or more in the entire temperature range of ⁇ 10° C. to 40° C., both inclusive, at the frequency of 30 Hz, a high loss factor can always be maintained in a high spin speed region close to a maximum spin speed of washing machines in the temperature range in which washing machines are used. Vibration can therefore be reduced.
  • the anti-vibration rubber of the present invention contains a polymer component, and the polymer component mainly contains butyl rubber.
  • An anti-vibration rubber having a high loss factor in the temperature range of ⁇ 10° C. to 40° C., both inclusive, can thus be implemented.
  • the butyl rubber be halogenated butyl rubber. This can reduce compression set.
  • the anti-vibration rubber of the present invention further contain a metal oxide as a vulcanizing agent. This can reduce compression set.
  • the anti-vibration rubber of the present invention further contain a tackifying resin.
  • An anti-vibration rubber having a high loss factor in the temperature range of ⁇ 10° C. to 40° C., both inclusive, can thus be implemented.
  • the anti-vibration rubber of the present invention further contain a processing aid.
  • An anti-vibration rubber with improved processability can thus be implemented.
  • the anti-vibration rubber of the present invention can reduce vibration.
  • FIG. 1 is a cutaway side view schematically showing a washing machine with anti-vibration rubber which is disclosed in Patent Literature 1.
  • FIG. 2 is a sectional view schematically showing a washing machine with anti-vibration rubber which is disclosed in Patent Literature 2.
  • FIG. 3 is a graph showing loss factors of anti-vibration rubbers of Samples 1 to 6.
  • FIG. 4 is a graph showing loss factors of anti-vibration rubbers of Samples 7 to 10.
  • FIG. 5 is a graph showing the amounts of amplitude measured with the anti-vibration rubbers of Samples 1 to 9 being attached to washing machines.
  • An anti-vibration rubber of an embodiment of the present invention is an anti-vibration rubber for washing machines.
  • the anti-vibration rubber of the present embodiment is used for leg rubbers 31 of washing machines and is disposed at positions similar to those of the leg rubbers 31 of FIGS. 1 and 2 .
  • the anti-vibration rubber of the present embodiment is suitably used for washing machines with a natural frequency at 1,000 rpm or higher. That is, the anti-vibration rubber of the present embodiment is suitably used for washing machines including a wash tub holding therein a spin tub that turns, and an outer cabinet accommodating the wash tub and having a natural frequency at 1,000 rpm or higher.
  • the anti-vibration rubber of the present embodiment has a maximum loss factor at a temperature of ⁇ 10° C. to 40° C., both inclusive, preferably 0° C. to 40° C., both inclusive, and more preferably 5° C. to 35° C., both inclusive.
  • the anti-vibration rubber has a loss factor of 0.4 or more, preferably 0.45 or more, in the entire temperature range of ⁇ 10° C. to 40° C., both inclusive, at a frequency of 30 Hz.
  • the anti-vibration rubber preferably has a loss factor of 0.5 or more, more preferably 0.6 or more, in the entire temperature range of 0° C. to 40° C., both inclusive, at the frequency of 30 Hz. In view of anti-vibration properties, the higher the loss factor is, the more preferable.
  • the “loss factor (tan ⁇ )” is one of evaluation indices of anti-vibration properties of anti-vibration materials, and for example, is a value that is measured according to JIS K 6394 (testing methods and small testing devices for dynamic properties of vulcanized rubber and thermoplastic rubber). A high loss factor indicates that the anti-vibration rubber has a strong ability to reduce vibration.
  • Compression permanent set of the anti-vibration rubber is preferably 30% or less.
  • the “compression permanent set” is a value that is measured according to JIS K 6262 (methods for determining compression set of vulcanized rubber and thermoplastic rubber at ambient, high, and low temperatures). Low compression permanent set indicates that the anti-vibration rubber has a strong ability to recover when compressed for a long period of time.
  • Such an anti-vibration rubber (vulcanized anti-vibration rubber) of the present embodiment is made of a rubber composition containing a polymer component, a tackifying resin, a processing aid, a vulcanizing agent, a vulcanization accelerator, and a filler.
  • the rubber composition will be described below.
  • the polymer component is not particularly limited as long as it is a rubber material. However, it is preferable that the polymer component mainly contain butyl rubber. As used herein, “mainly contain” means 50 mass% or more of the total polymer component.
  • butyl rubber examples include halogenated butyl rubber and regular butyl rubber, and halogenated butyl rubber is preferred.
  • halogenated butyl rubber examples include chlorobutyl rubber and brominated butyl rubber, and chlorobutyl rubber is preferred.
  • Either a single kind of polymer component or a mixture of two or more kinds of polymer components may be used, but it is preferable to use a single kind of halogenated rubber. That is, it is preferable that the polymer component mainly contain halogenated butyl rubber and the remainder of the polymer component be unavoidable impurities.
  • the tackifying resin to be used herein has a melting point in the range of 90° C. to 150° C., both inclusive.
  • the tackifying resin include rosin resin, terpene resin, petroleum resin, coal resin, phenolic resin, xylene resin, and coumarone resin.
  • One of these resins may be used solely or a mixture of two or more of these resins may be used.
  • the tackifying resin be one or more kinds of resins selected from the group consisting of rosin resin, terpene resin, petroleum resin, coal resin, phenolic resin, and xylene resin.
  • the tackifying resin preferably has a melting point of 90° C. or higher, more preferably 100° C. or higher, even more preferably 120° C. or higher, most preferably in the range of 120° C. to 150° C., both inclusive.
  • the content of the tackifying resin is preferably in the range of 10 to 60 parts by mass, both inclusive, more preferably 25 to 60 parts by mass, both inclusive, even more preferably 35 to 60 parts by mass, both inclusive, most preferably 40 to 60 parts by mass, both inclusive, per 100 parts by mass of the polymer component.
  • the content of the tackifying resin having a melting point of 120° C. to 150° C., both inclusive is preferably in the range of 40 to 60 parts by mass, both inclusive, per 100 parts by mass of the polymer component.
  • the vulcanizing agent is not particularly limited.
  • the vulcanizing agent include sulfur, a sulfur-based vulcanizing agent such as tetraalkylthiuram disulfide, a metal oxide, an organic peroxide, and a resin vulcanizing agent.
  • One of these vulcanizing agents may be used solely or a mixture of two or more of these vulcanizing agents may be used.
  • the vulcanizing agent contain a metal oxide.
  • the metal oxide is not particularly limited. Examples of the metal oxide include zinc oxide and magnesium oxide, and zinc oxide is preferred.
  • the content of the vulcanizing agent is preferably in the range of 1 to 50 parts by mass, both inclusive, more preferably 3 to 10 parts by mass, both inclusive, per 100 parts by mass of the polymer component.
  • the vulcanization accelerator is not particularly limited.
  • the vulcanization accelerator include thiazoles such as dibenzothiazyl disulfide, sulfenamides such as N-cyclohexyl-2-benzothiazole sulfenamide, thiurams such as tetramethylthiuram disulfide, and dithiocarbamates such as zinc dimethyldithiocarbamate.
  • thiazoles such as dibenzothiazyl disulfide, sulfenamides such as N-cyclohexyl-2-benzothiazole sulfenamide, thiurams such as tetramethylthiuram disulfide, and dithiocarbamates such as zinc dimethyldithiocarbamate.
  • One of these vulcanization accelerators may be used solely or a mixture of two or more of these vulcanization accelerators may be used.
  • the content of the vulcanization accelerator is preferably in the range of
  • the vulcanizing agent means a compounding agent that preferentially reacts with a rubber material.
  • the vulcanization accelerator (vulcanization accelerator aid) means a compounding agent that facilitates a reaction that is caused by the vulcanizing agent and accelerates the reaction or that increases crosslink density.
  • the processing aid is not particularly limited as long as it is a material that improves processability.
  • Examples of the processing aid include stearic acid and amines. One of these processing aids may be used solely or a mixture of two or more of these processing aids may be used.
  • the processing aid is preferably a compound having a fatty acid skeleton, more preferably stearic acid.
  • the content of the processing aid is preferably in the range of 0.3 to 10 parts by mass, both inclusive, more preferably 0.3 to 5 parts by mass, both inclusive, per 100 parts by mass of the polymer component. If the content of the processing aid is less than 0.3 parts by mass, processability during kneading is not sufficiently improved. If the content of the processing aid is more than 10 parts by mass, compression set may be deteriorated.
  • the filler is not particularly limited.
  • Examples of the filler include carbon black, silica, calcium carbonate, talc, clay, and titanium white.
  • One of these fillers may be used solely or a mixture of two or more of these fillers may be used.
  • the rubber composition may further contain a softener, a plasticizer, an anti-aging agent, a reinforcing agent, etc. as appropriate in addition to the substances described above.
  • a method for producing the anti-vibration rubber of the present embodiment will be described below.
  • a polymer component, a tackifying resin, a vulcanizing agent, a vulcanization accelerator, and a filler are kneaded with an open roll, an internal kneading machine (e.g., Intermix, kneader, or Banbury mixer), etc. to produce an unvulcanized rubber composition.
  • an internal kneading machine e.g., Intermix, kneader, or Banbury mixer
  • the rubber compression is vulcanized by, e.g., compression press molding, preferably by transfer molding etc.
  • the anti-vibration rubber of the present embodiment can thus be produced.
  • Table 1 shows the contents of each component and the evaluation results of Samples 1 to 10.
  • Table 2 specifically shows the components listed in Table 1.
  • a polymer component, a tackifying resin, a filler, a vulcanizing agent, a vulcanization accelerator, and a processing aid were kneaded with a kneading machine as shown in Tables 1 and 2 to produce rubber compositions of Samples 1 to 6.
  • Each of the rubber compositions of Samples 1 to 6 was then vulcanized by heating at 160° C. for 30 minutes to produce anti-vibration rubbers of Samples 1 to 6.
  • the anti-vibration rubbers of Samples 1 to 6 contain halogenated butyl rubber as a polymer component, a tackifying resin, a filler, a processing aid, a vulcanizing agent, and a vulcanization accelerator, and the remainder is unavoidable impurities.
  • a polymer component, a filler, a vulcanizing agent, a vulcanization accelerator, a processing aid, and a softener were kneaded with a kneading machine as shown in Tables 1 and 2 to produce rubber compositions of Samples 7 to 9.
  • Each of the rubber compositions of Samples 7 to 9 was then vulcanized by heating at 160° C. for 30 minutes with a molding machine to produce anti-vibration rubbers of Samples 7 to 9.
  • a polymer component, a tackifying resin, a filler, a vulcanizing agent, a vulcanization accelerator, and a processing aid were kneaded with a kneading machine as shown in Tables 1 and 2 to produce a rubber composition of Sample 10.
  • the rubber composition of Sample 10 was then vulcanized by heating at 160° C. for 30 minutes to produce an anti-vibration rubber of Sample 10.
  • Loss factors of the anti-vibration rubbers of Samples 1 to 10 were measured according to JIS K 6394 with a dynamic viscoelasticity measuring device Rheogel-E4000 made by UBM. The measurement was carried out under the following conditions. Test pieces of 15 mm long, 5 mm wide, and 2 mm thick were used and were strained in the vertical direction at a test interval (interval between upper and lower chucks) of 10 mm, initial strain (mean strain) of 10% (1 mm), amplitude of ⁇ 0.02% ( ⁇ 2 ⁇ m), and a frequency of 30 Hz. The results are shown in Table 1 and FIGS. 3 and 4 .
  • the anti-vibration rubbers of Samples 1 to 10 were used as leg rubbers of washing machines with a natural frequency at 1,400 rpm, and vibration amplitude (amount of amplitude) at 25° C. was measured. The results are shown in FIG. 5 and Tables 1 and 3.
  • “Anti-Vibration Properties” in Table 1 “X” indicates that the amount of amplitude at the natural frequency of the washing machine was 0.2 mm or less, “Y” indicates that the amount of amplitude at the natural frequency of the washing machine was more than 0.2 mm and 0.3 mm or less, and “Z” indicates that the amount of amplitude at the natural frequency of the washing machine was more than 0.3 mm.
  • Compression set (c-set) was measured according to JIS K 6262 after storage at a temperature of 100° C. and a compression rate of 25% for 24 hours. The results are shown in Table 1.
  • each of the anti-vibration rubbers of Samples 1 to 6 had a maximum loss factor at a temperature of ⁇ 10° C. to 40° C., both inclusive, and had a loss factor of 0.4 or more in the entire temperature range of ⁇ 10° C. to 40° C., both inclusive, at the frequency of 30 Hz.
  • each of the anti-vibration rubbers of Samples 1 to 5 had a maximum loss factor at a temperature of 0° C. to 40° C., both inclusive, and had a loss factor of 0.5 or more in the entire temperature range of 0° C. to 40° C., both inclusive, at the frequency of 30 Hz.
  • each of the anti-vibration rubbers of Samples 7 to 9 had a maximum loss factor at a temperature of ⁇ 25° C. or lower, and each of the anti-vibration rubbers of Samples 7 to 10 had a loss factor of less than 0.4 in a part of the temperature range of ⁇ 10° C. to 40° C., both inclusive, at the frequency of 30 Hz.
  • the anti-vibration rubber of Sample 10 has a high loss factor at around 20° C. at the frequency of 30 Hz, but a high loss factor cannot be maintained in the low temperature range of ⁇ 10° to 5° C. It was thus confirmed the anti-vibration rubber of Sample 10 had poor anti-vibration properties.
  • Example 1 it was confirmed that anti-vibration rubbers having a maximum loss factor at a temperature of ⁇ 10° C. to 40° C., both inclusive, and having a loss factor of 0.4 or more in the entire temperature range of ⁇ 10° C. to 40° C., both inclusive, at the frequency of 30 Hz in temperature variance measurement of dynamic viscoelasticity at the frequency of 30 Hz can reduce vibration when attached to washing machines.
  • the anti-vibration rubber of the present invention is suitably used for washing machines with a natural frequency at 1,000 rpm or higher.
  • anti-vibration rubbers having a maximum loss factor at a temperature of ⁇ 10° C. to 40° C., both inclusive, and having a loss factor of 0.4 or more in the entire temperature range of ⁇ 10° C. to 40° C., both inclusive, at the frequency of 30 Hz in temperature variance measurement of dynamic viscoelasticity at the frequency of 30 Hz can be implemented by using a rubber composition containing a polymer component mainly containing butyl rubber, a tackifying resin, and a metal oxide serving as a vulcanizing agent.
  • anti-vibration rubbers molded from a rubber composition in which a tackifying resin has a melting point of 100° C. or higher and the content of the tackifying resin is 35 to 60 parts by mass, both inclusive, per 100 parts by mass of a polymer component have a very strong ability to reduce vibration.
  • Table 4 shows the contents of each component and the evaluation results of Samples 2, 11, and 12.
  • Sample 2 in Table 4 is the same as Sample 2 in Table 1.
  • Components of Samples 11 and 12 are specifically shown in Table 2.
  • a polymer component, a tackifying resin, a filler, a vulcanizing agent, a vulcanization accelerator, and a processing aid were kneaded with a kneading machine as shown in Tables 2 and 4 to produce a rubber composition of Sample 11.
  • a polymer component, a tackifying resin, a filler, a vulcanizing agent, and a vulcanization accelerator were kneaded with a kneading machine as shown in Tables 2 and 4 to produce a rubber composition of Sample 12.
  • Each of the rubber compositions of Samples 11 and 12 was then vulcanized by heating at 160° C. for 30 minutes to produce anti-vibration rubbers of Samples 11 and 12.
  • a sulfur-based vulcanizing agent was used as a vulcanizing agent of Sample 11, and a resin vulcanizing agent was used as a vulcanizing agent of Sample 12.
  • zinc oxide was used as a vulcanization accelerator.
  • each of the anti-vibration rubbers of Samples 11 and 12 had a maximum loss factor at a temperature of ⁇ 10° C. to 40° C., both inclusive, and had a loss factor of 0.4 or more in the entire temperature range of ⁇ 10° C. to 40° C., both inclusive, at the frequency of 30 Hz.
  • Sample 2 containing a metal oxide as a vulcanizing agent exhibited lower compression set than Sample 11 containing a sulfur-based vulcanizing agent as a vulcanizing agent.
  • Sample 2 exhibited satisfactory compression set at high temperatures, which indicates that Sample 2 has excellent long-term reliability.
  • Sample 2 containing a metal oxide as a vulcanizing agent and containing stearic acid as a processing aid exhibited higher processability than Sample 12 containing a resin vulcanizing agent as a vulcanizing agent and containing no processing aid.
  • Sample 1 and 3 to 6 also contain a metal oxide as a vulcanizing agent and contain stearic acid as a processing aid. Accordingly, it was found that, like Sample 2 shown in Table 4, Samples 1 and 3 to 4 also exhibited satisfactory compression set and high processability.
  • Example 2 It was found from Example 2 that the use of a metal oxide as a vulcanizing agent can improve compression set in addition to providing high anti-vibration properties and that addition of a processing aid can further improve processability.

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US10266686B2 (en) 2019-04-23
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US20190010320A1 (en) 2019-01-10
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EP3290564A4 (en) 2018-09-26
CN109576948B (zh) 2021-08-27

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