WO2006095854A1 - Composition de materiau d'isolation anti-vibration - Google Patents

Composition de materiau d'isolation anti-vibration Download PDF

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Publication number
WO2006095854A1
WO2006095854A1 PCT/JP2006/304739 JP2006304739W WO2006095854A1 WO 2006095854 A1 WO2006095854 A1 WO 2006095854A1 JP 2006304739 W JP2006304739 W JP 2006304739W WO 2006095854 A1 WO2006095854 A1 WO 2006095854A1
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Prior art keywords
vibration
component
weight
material composition
isobutylene
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PCT/JP2006/304739
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English (en)
Japanese (ja)
Inventor
Katsuhiko Kimura
Hironari Nakabayashi
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Kaneka Corporation
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Priority to JP2007507201A priority Critical patent/JPWO2006095854A1/ja
Publication of WO2006095854A1 publication Critical patent/WO2006095854A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • 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
    • C08L23/02—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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes

Definitions

  • the present invention relates to a vibration-proof material composition.
  • a recording medium driving device such as an optical drive or a hard disk drive (HDD) includes a recording medium driving unit that records and / or reproduces a recording medium inside the device, and this recording medium driving unit Is equipped with a motor for driving the recording medium and a pickup means for recording and Z or reproducing the recording medium. These are mechanically vulnerable to external and internal vibrations.
  • an insulator made of thermoplastic rubber or the like is attached to the recording medium driving device for the purpose of vibration isolation.
  • An anti-vibration material that can be used for such an insulator for a recording medium driving device is required to have excellent anti-vibration properties and vibration damping properties (vibration suppression properties).
  • Anti-vibration is related to the flexibility of the anti-vibration material. The higher the flexibility, the lower the natural frequency of the entire system, so the transmission rate of vibration decreases (improves vibration isolation). In addition, it is possible to further suppress the transmission of vibrations by increasing vibration damping.
  • the isobutylene block copolymer proposed in Patent Document 1 and Patent Document 2 as a material for a vibration-proofing material also has a problem in terms of resilience due to its large compression set.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2003-49043
  • Patent Document 2 International Publication No. 03Z27183 Pamphlet
  • Patent Document 3 International Publication No. 03Z2654 Pamphlet
  • Patent Document 4 Pamphlet of International Publication No.04Z44050
  • An object of the present invention is to provide a highly flexible vibration-proof and vibration-damping property that can be used for an optical drive device, a hard disk drive (HDD), and the like in view of the prior art.
  • An object of the present invention is to provide an anti-vibration material composition excellent in (vibration control) and load resistance (restoration).
  • the present inventors use linear low-density polyethylene as the polyolefin species and combine petroleum-based hydrocarbon resin and paraffin-based oil while maintaining excellent resilience and vibration damping properties.
  • Hardness power The inventors have found that a very flexible vibration-proofing material composition having an A hardness of 10 degrees or less can be obtained, leading to the present invention. That is, the present invention relates to an isobutylene polymer having a alkenyl group at the terminal (A), a composition crosslinked with a hydroxy group-containing compound in the presence of linear low density polyethylene (B), petroleum The present invention relates to an anti-vibration material composition that has a power based on a hydrocarbon-based hydrocarbon (C) and a oil-based oil (D).
  • a polymer block ( a ) mainly composed of an aromatic vinyl monomer unit and a polymer block (b) mainly composed of an isobutylene unit (b) a block copolymer comprising a force
  • the present invention relates to the vibration-proof material composition comprising E).
  • the component (B) is 50 to 50 parts by weight
  • the component (C) is 50 to 300 parts by weight
  • the component (D) is 100 parts by weight of the component (A).
  • the anti-vibration material composition comprising 100 to 400 parts by weight and 0 to 50 parts by weight of the component (E).
  • the alkenyl group at the terminal of the component (A) is an aryl group introduced at the terminal by a substitution reaction of chlorotrimethylsilane and chlorine.
  • the component (A) has an isobutylene type having a weight average molecular weight of 1,000 to 500,000 and having an average of 0.2 or more alkenyl groups per molecule at the terminal. It is a polymer.
  • the isobutylene unit is 50% by weight or more.
  • the component (C) is an alicyclic saturated hydrocarbon resin.
  • the component (E) is a polymer block mainly composed of an aromatic vinyl compound (a) -polymer block mainly composed of isobutylene (b) -aromatic Vinyl A triblock copolymer having a structure of a polymer block (a) mainly composed of a series compound and having a weight average molecular weight of 40,000 to 200,000.
  • the present invention it is possible to provide a vibration-proof material composition having high vibration resistance, vibration damping (damping), and load resistance (restorability) with high flexibility.
  • a vibration-proof material composition having high vibration resistance, vibration damping (damping), and load resistance (restorability) with high flexibility.
  • an anti-vibration material composition having a JIS-A hardness of 10 degrees or less flexibility while maintaining high resilience and vibration damping properties.
  • the isobutylene polymer (A) used in the present invention is not particularly limited as long as it is obtained by polymerizing a monomer component containing isobutylene, but in terms of flexibility, vibration proofing and vibration damping.
  • the isoprene unit is preferably 50% by weight or more, more preferably 70% by weight or more, and more preferably 90% by weight or more.
  • the monomer other than isopylene used together with isopylene is not particularly limited as long as it is a monomer component capable of thione polymerization.
  • aromatic vinyl monomers, aliphatic olefin monomers, and gen monomers are used. Examples thereof include monomers, vinyl ether monomers, and monomers such as ⁇ -pinene. These may be used alone or in combination of two or more.
  • aromatic butyl monomers include styrene, ⁇ -alkyl styrene such as ⁇ -methyl styrene, ⁇ -ethyl styrene, ⁇ -methyl- ⁇ -methyl styrene; ⁇ -methylol styrene; —Methylenostyrene, m-methylstyrene, p-methylenostyrene, 2,4 dimethyl styrene, ethyl styrene, 2, 4, 6 trimethyl styrene, o-tert-butyl styrene, p-tert-butyl styrene, p cyclohexyl styrene Nuclear alkyl-substituted styrene such as o chlorostyrene, m chlorostyrene, p chlorostyrene, p bromostyrene, 2-methyl 4-ch
  • Examples of the aliphatic olefin monomers include ethylene, propylene, 1-butene, 2-methyl 1-butene, 3-methyl-1-butene, pentene, hexene, cyclohexene, 4-methyl-1-pentene, Examples include burcyclohexene, otaten and norbornene.
  • Examples of the above-mentioned gen-based monomers include butadiene, isoprene, cyclopentagen, cyclohexagen, dicyclopentagen, dibutenebenzene, ethylidene norbornene, and the like.
  • the above butyl ether monomers include methyl butyl ether, ethyl butyl ether, (n-, iso) propyl butyl ether, (n-, sec-, tert-, iso) butyl butyl ether, methyl propyl ether.
  • Examples include pale ether and ethyl propellate.
  • aromatic vinyl monomers are more preferred in terms of control of vibration damping characteristics, which are preferred by aromatic bull monomers and bull ether monomers, .
  • styrene, a-methylstyrene, p-methylolstyrene, and indene are particularly preferable from the viewpoint of balance between cost, physical properties, and productivity.
  • the structure of the isobutylene polymer (A) is not particularly limited, and any structure such as a homopolymer of isobutylene and a copolymer such as a random copolymer, a block copolymer, and a graft copolymer, etc. These isobutylene polymers can also be used.
  • the molecular weight of the isobutylene polymer (A) having an alkenyl group at the terminal is not particularly limited! /, Force The weight average molecular weight measured by gel permeation chromatography is 1,000,000, etc. 500,000 Power preference ⁇ , 5,000 power etc. 200, 000 power ⁇ Especially preferred! / ,. If the weight-average molecular weight is less than 1,000, the mechanical properties of the vibration-proof material composition may not be fully expressed, and if it exceeds 500,000, molding of the vibration-proof material composition may occur. There is a tendency for the sex, etc. to decline significantly.
  • the weight average molecular weight and the molecular weight distribution can be usually obtained as a molecular weight in terms of polystyrene by performing GPC measurement using a polystyrene gel column using black mouth form as a mobile phase.
  • GPC gel permeation chromatography
  • column Shodex K-804 (polystyrene gel) manufactured by Showa Denko KK) Use as a mobile phase and find it by converting to polystyrene.
  • the alkenyl group at the terminal of the isobutylene polymer (A) is a group containing a carbon-carbon double bond active for the crosslinking reaction of the component (A) for achieving the object of the present invention. There is no particular limitation as long as it is present.
  • Specific examples include an aliphatic unsaturated hydrocarbon group such as a butyl group, a allyl group, a methyl butyl group, a probe group, a butyl group, a pentyl group, and a hexyl group, a cyclopropyl group, Examples thereof include cyclic unsaturated hydrocarbon groups such as a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group.
  • Methods for introducing an alkenyl group into the terminal of an isobutylene polymer (A) having an alkenyl group at the terminal are disclosed in JP-A-3-152164 and JP-A-7-304909! Examples thereof include a method of introducing an unsaturated group into a polymer by reacting a compound having an unsaturated group with a polymer having a functional group such as a hydroxyl group.
  • the amount of the alkenyl group at the end of the isobutylene polymer (A) can be arbitrarily selected depending on the required properties, but from the viewpoint of the properties after crosslinking,
  • the average amount is preferably 0.2 or more per molecule, more preferably 0.5 or more, and most preferably 1.0 or more. If the number is less than 2, the effect of improving the physical properties of the composition due to crosslinking may not be sufficiently exhibited.
  • the linear low density polyethylene is produced by copolymerizing ethylene monomer and ⁇ -olefin comonomer by a medium pressure method such as solution polymerization, slurry polymerization, and gas phase polymerization.
  • ⁇ -olefin fincomonomer includes 1-butene, 1-hexene, 1-octene, etc.
  • linear low density polyethylene using 1-hexene and 1-octene is particularly preferred.
  • the linear low density polyethylene (B) has a density measured according to JIS K0061 of 0.
  • the force of use! Ru ones 940g / cm 3, 0. 903 ⁇ 0. More range of preferably instrument 0. 904 ⁇ 930g / cm 3 to use one of the 935 g / cm 3 It is particularly preferred to use some. If the density is less than 0.900 gZcm 3 , the stiffness of the vibration isolator may be significantly reduced, and if the density is higher than 0.940 gZcm 3 , the strength of the vibration isolator may be significantly reduced.
  • the amount of linear low-density polyethylene (B) added is preferably 5 to 50 parts by weight, preferably 10 to 40 parts by weight, per 100 parts by weight of the isobutylene polymer (A). Is particularly preferred. If the amount is less than 5 parts by weight, the isobutylene polymer of component (A) may not be sufficiently dispersed and coarse particles may be generated. If it exceeds 50 parts by weight, the flexibility and resilience of the vibration-proof material tend to be impaired.
  • hydrosilyl group-containing compound for obtaining a crosslinked product of the isobutylene polymer (A) having an alkenyl group at the terminal various kinds of compounds without particular limitation can be used. That is, a chain polysiloxane represented by the general formula (I) or ( ⁇ );
  • R 1 and R 2 represent an alkyl group having 1 to 6 carbon atoms or a phenyl group
  • R 3 represents an alkyl group having 1 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms.
  • R 1 and R 2 may be the same or different from each other a a «0 ⁇ a ⁇ 100, bi or 2 ⁇ b ⁇ 100, d or integer satisfying 0 ⁇ c ⁇ 100.
  • R 4 and R 5 represent an alkyl group having 1 to 6 carbon atoms or a phenyl group
  • R 6 represents an alkyl group having 1 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms.
  • Each R 4 and R 5 may be the same or different from each other: d is an integer 0 ⁇ d ⁇ 8, e is an integer 2 ⁇ e ⁇ 10, f is an integer 0 ⁇ f ⁇ 8, and 3 ⁇ d + e + f ⁇ 10)) and the like can be used.
  • the isobutylene polymer (A) having an alkenyl group at the terminal and the hydrosilyl group-containing compound can be mixed at an arbitrary ratio, but from the viewpoint of reactivity, the molar amount of the hydrosilyl group relative to the alkenyl group. Is preferably in the range of 0.5 to 10, more preferably in the range of 1 to 5. If the molar ratio is less than 0.5, the crosslinking is insufficient and stickiness remains, and the compression set of the vibration-proof material composition also tends to deteriorate. Since a large amount of active hydrosilyl groups remain, hydrogen gas is generated by hydrolysis, and cracks tend to form voids in the vibration isolator.
  • the cross-linking reaction between the isobutylene polymer having an alkenyl group at the terminal (A) and the hydrosilyl group-containing compound proceeds by mixing and heating the two components, but a cross-linking catalyst ( Hydrosilylation catalyst) can be added.
  • a cross-linking catalyst Hydrosilylation catalyst
  • Such a bridging catalyst is not particularly limited, and examples thereof include radical initiators such as organic peroxide azo compounds and transition metal catalysts.
  • the radical initiator is not particularly limited.
  • di-t-butyl peroxide 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy).
  • the transition metal catalyst is not particularly limited.
  • a platinum solid, alumina, silica, carbon black or the like dispersed in a platinum solid, chloroplatinic acid, chloroplatinic acid and alcohol, aldehyde, Examples include complexes with ketones, platinum-olefin complexes, and platinum (0) -dialkyltetramethyldisiloxane complexes.
  • catalysts other than platinum compounds include RhCl (PPh), RhCl, RuCl, IrCl, FeCl, A1C1, PdCl ⁇ 0, NiCl
  • platinum bulesiloxane is most preferred because the resulting vibration-proof material composition has good compatibility, crosslinking efficiency, and scorch stability (storage stability of the uncrosslinked composition).
  • the petroleum hydrocarbon resin used as the component (C) is also called “petroleum resin”, and it is a subsidiary of an ethylene plant that produces ethylene, propylene, etc. by petroleum steam cracking. Diolefin and monoolefins contained in the resulting cracked oil fraction are polymerized without isolation.
  • Petroleum hydrocarbon resin is one In general, aliphatic or C petroleum oils and C
  • Aromatic or C-based petroleum resin made from 9 minutes, CC copolymerized from both
  • hydrocarbon resin It is categorized as hydrocarbon resin.
  • any of these petroleum-based hydrocarbon hydrocarbons may be used, but the phase with an isobutylene polymer (or linear low-density polyethylene (B)) having high stability of the resin.
  • An alicyclic saturated hydrocarbon resin is preferable because of its excellent solubility, and examples of the alicyclic saturated hydrocarbon resin include Alcon P-70, P-90, P-100, P-115, P-125. , P-140, Alcon M-90, M-100, M-115, and M-135 (all manufactured by Arakawa Chemical Industries, Ltd.).
  • Component (C) is added for the purpose of adjusting the peak position of tan ⁇ , which is an index of vibration damping, and adapting the vibration damping of the vibration damping material to the intended use conditions (temperature, frequency).
  • tan ⁇ which is an index of vibration damping
  • the tan ⁇ peak of the composition is shifted to a higher temperature side and a lower frequency side.
  • the blending amount of the petroleum hydrocarbon resin (C) is not particularly limited, but when the isobutylene polymer ( ⁇ ⁇ ) having a alkenyl group at the terminal is 100 parts by weight, 50 to 300 It is preferably 100 parts by weight to 300 parts by weight. Even when the amount is less than 50 parts by weight or more than 300 parts by weight, the vibration-proof material tends not to exhibit sufficient vibration damping properties.
  • a bulky oil (D) is further added.
  • the component (D) component has the effect of shifting the peak position of tan ⁇ , which is a vibration damping index, to the lower temperature side and the higher frequency side, and the reverse effect of the (C) component.
  • the peak position of tan ⁇ can be arbitrarily controlled by the balance with the amount of the additive.
  • paraffinic oil examples include Diana Process PW 32, PW90, PW150, PW380 (manufactured by Idemitsu Kosan Co., Ltd.), JOMO Process P200, P300, P400, P500, EPT750 (Janen Energy Corporation). Commercial products such as Plastor 35, 65, 155, 455, 2105 (manufactured by ExxonMobil Co., Ltd.).
  • paraffinic oils (D) may be used alone or in combination of two or more.
  • the paraffinic oil (D) is preferably used in an amount of 100 to 400 parts by weight, more preferably 150 to 400 parts by weight, when the amount of the isobutylene polymer (A) is 100 parts by weight. If the amount of the component (D) is less than 100 parts by weight, there is a tendency that sufficient vibration resistance is not imparted to the vibration isolator, and if it exceeds 400 parts by weight, bleeding tends to occur.
  • the anti-vibration material composition of the present invention is a polymer block mainly composed of an aromatic vinyl monomer unit as necessary for the purpose of improving mechanical properties and molding fluidity without impairing flexibility.
  • a block copolymer (E) having a) and a polymer block mainly composed of isobutylene units (b) also having a force may be included.
  • the polymer block (a) mainly composed of an aromatic bur monomer unit is not particularly limited as long as it contains an aromatic bul monomer unit in the block.
  • the block (a) contains 50% by weight or more of an aromatic bule monomer unit, preferably 70% by weight or more, more preferably 90% by weight or more.
  • the aromatic bur monomer include the same monomers as those exemplified above as the aromatic vinyl monomer that can be used in the isobutylene polymer (A). Of these, styrene, a-methylstyrene, p-methylolstyrene, and indene are preferable from the viewpoint of the balance between the cost and the physical properties and productivity of the vibration-proof material composition.
  • the monomer other than the aromatic vinyl compound used together with the aromatic vinyl compound is not particularly limited as long as it is a monomer component capable of cationic polymerization, but is not limited to aliphatic olefins, isoprene, butadiene. And gens such as dibutenebenzene, vinyl ethers, and monomers such as ⁇ -pinene.
  • isobutylene polymer ⁇ Examples of monomers that can be used in (1) include those exemplified above. These may be used alone or in combination of two or more.
  • the polymer block (b) mainly composed of an isobutylene unit is not particularly limited as long as it contains an isobutylene monomer unit in the block.
  • the polymer block (b) is flexible, vibration-proof and vibration-damping.
  • the block (b) contains 50% by weight or more of isobutylene monomer units, more preferably 70% by weight or more, and more preferably 90% by weight or more. preferable.
  • the monomer other than isoprene polymerized with isopylene is not particularly limited as long as it is a monomer capable of polymerization with cathylene, but is not limited to aliphatic olefins, isoprenes, butadienes, dibutylbenzenes and other gens, and bull ethers. And monomers such as 13 pinene.
  • Specific examples of monomers that can be used in the isobutylene polymer (A) include those exemplified above. These may be used alone or in combination of two or more.
  • the structure of the block copolymer (E) is not particularly limited, but the polymer block mainly comprising an aromatic vinyl monomer unit is (a) and the polymer mainly comprising an isobutylene unit.
  • the block is represented as (b)
  • a polymer is preferred.
  • (a)-(b) type diblock copolymer (a)-(b)-(a ) Type or (b)-(a)-(b) type triblock copolymer or a mixture thereof.
  • a triblock copolymer of (a)-(b)-(a) is particularly preferred.
  • the ratio of the block (a) to the block (b) in the block copolymer (E) is not particularly limited, but is mainly composed of isobutylene units from the balance of physical properties and processability.
  • the polymer block (b) is 95 to 20% by weight, and the polymer block (a) mainly composed of aromatic vinyl monomer units is preferably 5 to 80% by weight. It is particularly preferable that the polymer block (b) is 90 to 60% by weight and the polymer block (a)) mainly composed of aromatic vinyl monomer units is 10 to 40% by weight.
  • the molecular weight of the block copolymer (E) is not particularly limited, but the weight average molecular weight measured by gel permeation chromatography is preferably 40,000 force to 200,000.
  • the power of 50, 000 power etc. is especially preferred!
  • the weight average molecular weight force is less than 40,000, the mechanical properties such as bow I tension properties of the vibration-proof material composition tend to be insufficient, and when it exceeds 200,000, vibration resistance There is a significant tendency to decrease the formability of the material composition.
  • the amount of component (E) added is preferably 0 to 50 parts by weight, particularly preferably 0 to 30 parts by weight, when the amount of the isobutylene polymer (A) is 100 parts by weight. If it exceeds 50 parts by weight, the resilience and heat resistance of the vibration-proof material tend to deteriorate.
  • a reinforcing agent and a filler can be added to the vibration-proof material composition of the present invention within a range that does not impair the physical properties according to the required characteristics according to each application.
  • additives such as hindered phenol-based hindered amine-based antioxidants, ultraviolet absorbers, light stabilizers, pigments, surfactants, flame retardants and the like can be appropriately blended.
  • Known coupling agents, organic fillers, antiblocking agents, antistatic agents, flame retardants, antioxidants, UV absorbers, softeners, colorants, inorganic or organic antibacterials Agents, lubricants or silicone oils can also be added.
  • the antistatic agent N, N-bis- (2-hydroxyethyl) -alkylamines and glycerol fatty acid esters having an alkyl group having 12 to 18 carbon atoms are preferable.
  • fatty acid amides are preferred, and specific examples include L-acid amides, behenic acid amides, stearic acid amides, and oleic acid amides. Since the vibration-proofing material composition of the present invention tends to have high tackiness, it is preferable to add a lubricant or silicone oil for the purpose of suppressing the tackiness.
  • the vibration isolator composition of the present invention may contain bubbles inside. By incorporating bubbles, the weight of the vibration isolator can be reduced.
  • the method of incorporating bubbles is not particularly limited.
  • an inorganic hollow filler such as a glass balloon or a silica balloon, an organic hollow filler made of polyvinylidene fluoride, a polyvinylidene fluoride copolymer, or the like is blended.
  • the method for obtaining the composition in which the isobutylene-based polymer (A) having an alkenyl group at the terminal is crosslinked with the hydrosilyl group-containing compound in the presence of the linear low-density polyethylene (B) is not particularly limited. It can manufacture by the method illustrated in (1).
  • the (A) component, the (B) component, the crosslinking catalyst, etc. are extruded in advance.
  • a melt-kneader such as a machine
  • pelletize dry blend the hydrosilyl group-containing compound into the pellets, and then in a melt-kneader such as an extruder or Banbury mixer.
  • the dynamic crosslinking means that the terminal alkenyl group of the isobutylene polymer (A) is converted to a hydrosilyl group under melt kneading in a system in which the isobutylene polymer (A) and the hydrosilyl group-containing compound are present. It means that it is cross-linked by the inclusion compound.
  • the cross-linking reaction proceeds under melt-kneading, and the resulting polymer network is divided by shearing force, and exhibits thermoplasticity after cross-linking.
  • An anti-vibration material composition having improved physical properties can be obtained.
  • melt-kneading in a temperature range in which the set temperature of the melt-kneading apparatus is 140 to 240 ° C. More preferably, it is performed in the temperature range. If the temperature during the melt-kneading is lower than 140 ° C., the linear low-density polyethylene (B) is not sufficiently melted and the kneading tends to be uneven. On the other hand, when the temperature at the time of melt kneading is higher than 240 ° C., thermal decomposition of the isobutylene polymer (A) having an alkenyl group at the terminal tends to occur.
  • the addition of the component (C) is not particularly limited, and it may be added before the crosslinking reaction of the isobutylene polymer (A) or may be added to the composition after crosslinking. It may be added both before and after crosslinking. It is preferable to add the component (C) after the crosslinking of the component (A) because the addition of the component (C) may affect the crosslinking conditions.
  • component (D) and the component (E) added as necessary, various additives, etc., and before the crosslinking reaction of the isobutylene polymer (A) is performed. It may be added to the composition after crosslinking, or may be added both before and after crosslinking.
  • the component (D) promotes the mixing of the components (A) and (B) and promotes the uniform progress of the crosslinking reaction. It is preferable to add component (D) before crosslinking.
  • the anti-vibration material composition of the present invention can be obtained by mixing using a kneader or continuous melt kneader. wear. Furthermore, after mechanically mixing as necessary, the obtained vibration isolator composition can be shaped into pellets using an existing method.
  • the weight average molecular weight shown in the production examples is determined by the GPC (gel permeation chromatography) analyzer shown below and GPC measurement using a polystyrene gel column with black mouth form as the mobile phase to obtain the molecular weight in terms of polystyrene. It was. GPC measurement was performed with a GPC analyzer (system: GPC system manufactured by Waters, column: Shodex K-804 (polystyrene gel) manufactured by Showa Denko KK). The molecular weight in terms of polystyrene was determined using black mouth form as the mobile phase.
  • GPC gel permeation chromatography
  • the block copolymer was dissolved in heavy chloroform and NMR was measured to obtain an NMR chart.
  • the mole fraction of styrene was determined from the ratio of the isobutylene-derived peak (8H) and the styrene-derived aromatic ring peak (5H) in the chart.
  • the mole fraction was converted to a weight fraction using the molecular weight per unit to calculate the styrene content (% by weight).
  • the styrene content represents the weight ratio of units derived from styrene monomer to the total weight of the block copolymer.
  • JIS—A hardness was measured using a type A durometer (unit: degree). A 12. Omm thick press sheet was used as a test piece. For sheets having a JIS-A hardness of 10 degrees or less, ASKER-C hardness (unit: degree) was also measured.
  • compression set Measured according to JIS K-6262.
  • the test piece was a 12. Omm thick press sheet. It was measured at 70 ° CX for 22 hours under the condition of 25% deformation (unit:%).
  • 'Polyolefin 1 Linear low-density polyethylene, Ultzettas 15150J (Mitsui Engineering Co., Ltd.)
  • Polyolefin 2 High density polyethylene, Hi-Zex 2200J (Mitsui Chemicals Co., Ltd.) 'Resin 1: Alicyclic saturated hydrocarbon resin, Alcon 140—140 (Arakawa Chemical Co., Ltd.) • Resin 2: Alicyclic saturated Hydrocarbon resin, Alcon ⁇ -100 (Araji 11 Chemical Industry Co., Ltd.) • Oil 1: Paraffinic oil, JOMO process ⁇ -500 (Japan Energy Co., Ltd.)
  • Oil 2 Paraffinic oil, Diana process oil PW-380 (made by Idemitsu Kosan Co., Ltd.)
  • the reaction solution was washed twice with water, the solvent was evaporated, and the resulting polymer was vacuum-dried at 60 ° C. for 24 hours to obtain the desired isobutylene polymer (hereinafter abbreviated as APIB).
  • APIB isobutylene polymer
  • the weight average molecular weight was 45,500.
  • the number of terminal aryl groups for which NMR measurement data power was also calculated was an average of 2.0 per molecule.
  • the dynamic cross-linking composition (hereinafter abbreviated as MB1) was taken out.
  • a comparative dynamic crosslinking composition (hereinafter abbreviated as MB2) was prepared in the same manner as in Production Example 2, except that polyolefin 2 was used instead of polyolefin 1.
  • ⁇ (E) component> After purging the inside of the polymerization vessel of a 500 mL separable flask with nitrogen, using a syringe, n monohexane (dried with molecular sieves) 21.2 mL and butyl chloride (dried with molecular sieves) 256.6 mL After adding the polymerization vessel to the 70 ° C dry ice Z methanol bath and cooling it, 60.5 mL of isobutylene monomer is contained! Teflon (registered in a pressure-resistant glass liquid tube with a three-way cock) (Trademark) liquid feeding tube was connected, and isoprene monomer was fed into the polymerization vessel by nitrogen pressure.
  • Teflon registered in a pressure-resistant glass liquid tube with a three-way cock
  • SIBS1 block copolymer
  • GPC gel permeation chromatography
  • the p-dic milk mouthride 0.097 g (0.42 mmol) and N, N-dimethylacetamide 0.073 g (0.84 mmol) were calories.
  • a further 1.66 mL (15.12 mmol) of tetrachloride-titanium was added to initiate polymerization.
  • about 1 mL of the polymerization solution was extracted from the polymerization solution for sampling.
  • 13.71 g (131.67 mmol) of styrene monomer was added into the polymerization vessel.
  • the reaction solution in the polymerization vessel was added to a large amount of water to terminate the reaction.
  • the reaction solution was washed twice with water, the solvent was evaporated, and the resulting polymer was vacuum-dried at 60 ° C for 24 hours to obtain the desired block copolymer (hereinafter abbreviated as SIBS2). .
  • SIBS2 block copolymer
  • the weight average molecular weight was 110,000.
  • the styrene content calculated from the NMR measurement data was 30 wt%.
  • the components were weighed so as to have a total mass strength of Og, melt-kneaded for 5 minutes using a Laboplast mill set at 170 ° C., and the vibration-proof material composition was taken out.
  • the obtained vibration-damping material composition could be easily formed into a sheet by a heating press (manufactured by Shindo Metal Industry Co., Ltd.) at 190 ° C. In both cases, the oil bleed was unseen.
  • the hardness, tan ⁇ and compression set at 20 ° C. of the obtained sheet were measured according to the above methods. Table 1 shows the physical properties of each sheet.
  • the sheets of Examples 1 to 4 have flexibility of JIS- ⁇ hardness of 10 degrees or less while maintaining high vibration damping (tan ⁇ ) and good restoration property of compression set of 50% or less. Realized.
  • the sheet of Comparative Example 3 using high-density polyethylene as the polyolefin has a similar JIS-A hardness exceeding 10 degrees despite having the same composition as in Example 1.
  • the sheets of Comparative Examples 1 and 2 which are conventional techniques, have a large compression set and are poor in recoverability.
  • the vibration-proof, vibration-damping (damping), and load-bearing (restoration) are excellent in vibration-proofing while having a high flexibility of less than 10 degrees in JIS-A hardness.
  • a material composition can be provided. Therefore, the vibration-damping material composition of the present invention can be used as an elastic member for an inkjet printer, an insulator for a recording medium driving device, an HDD gasket, and an impact absorbing material for an HDD, and particularly an insulator for a recording medium driving device. Can be suitably used.

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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)
  • Vibration Prevention Devices (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L’invention décrit une composition de matériau d’isolation anti-vibration ayant une grande flexibilité tout en étant excellente en termes de propriétés d'isolation vis-à-vis des vibrations, de propriétés d'atténuation des vibrations (capacité d’amortissement) et de résistance à la charge (résilience). Cette composition de matériau d’isolation anti-vibration peut être utilisée pour un dispositif de lecture pour lecteurs optiques, lecteurs de disque dur et analogues. L’invention décrit plus spécifiquement une composition de matériau d’isolation anti-vibration composée d’une composition obtenue en réticulant un polymère d'isobutylène (A) ayant un groupe alcényle terminal avec un composé contenant un groupe hydrosilyle en présence d'un polyéthylène basse densité linéaire (B), d'une résine d’hydrocarbure de pétrole (C) et d'une huile de paraffine (D).
PCT/JP2006/304739 2005-03-11 2006-03-10 Composition de materiau d'isolation anti-vibration WO2006095854A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006312708A (ja) * 2005-04-08 2006-11-16 Polymatech Co Ltd 熱伝導性成形体
JP2013100404A (ja) * 2011-11-08 2013-05-23 Jx Nippon Oil & Energy Corp 改善したシール材用組成物およびその製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08311342A (ja) * 1995-05-19 1996-11-26 Kanegafuchi Chem Ind Co Ltd 防音防振材料
WO2001074964A1 (fr) * 2000-04-05 2001-10-11 Kaneka Corporation Composition amortissant les vibrations
JP2003049043A (ja) * 2001-08-03 2003-02-21 Kanegafuchi Chem Ind Co Ltd 弱電機器用防振材
WO2004044050A1 (fr) * 2002-11-11 2004-05-27 Kaneka Corporation Composition elastomere thermoplastique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08311342A (ja) * 1995-05-19 1996-11-26 Kanegafuchi Chem Ind Co Ltd 防音防振材料
WO2001074964A1 (fr) * 2000-04-05 2001-10-11 Kaneka Corporation Composition amortissant les vibrations
JP2003049043A (ja) * 2001-08-03 2003-02-21 Kanegafuchi Chem Ind Co Ltd 弱電機器用防振材
WO2004044050A1 (fr) * 2002-11-11 2004-05-27 Kaneka Corporation Composition elastomere thermoplastique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006312708A (ja) * 2005-04-08 2006-11-16 Polymatech Co Ltd 熱伝導性成形体
JP2013100404A (ja) * 2011-11-08 2013-05-23 Jx Nippon Oil & Energy Corp 改善したシール材用組成物およびその製造方法

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