JP2003240049A - Adhering method for vibration damping material composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simpler adhering method having higher adhesiveness than a method such as press working or hot melt machining of a vibration damping material composition containing isobutylene based block copolymer and a steel material. <P>SOLUTION: The vibration damping material composition A containing block copolymer comprising a polymer block mainly containing isobutylene and a polymer block mainly containing aromatic vinyl based compound and the steel material B are adhered by a pressure sensitive adhesive double coated tape C. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adhering a vibration damping composition for a vibration damping damper (viscoelastic damper) which absorbs shock displacement and vibration of a skeleton structure forming material in the field of construction.

[0002]

2. Description of the Related Art In the field of construction, vibration dampers are being developed for absorbing vibrations caused by earthquakes, typhoons and the like to impart a very high vibration damping structure to buildings. The damping material (viscoelastic material) used for the damping damper with stable damping property has high damping property in order to exert the action of absorbing the shock displacement and vibration of the skeleton structure forming material. In addition to the requirements, it is required that the temperature dependence of rigidity near room temperature is small in consideration of environmental conditions.

Such a vibration damper, particularly a so-called brace damper, is usually used by laminating a steel material and a vibration damping material in two layers or several layers, but the steel material and the vibration damping material are sufficiently adhered. It is essential from the viewpoint of structural safety. Regarding such adhesion, JP-A-10-3304
Japanese Patent Laid-Open No. 51-51 describes a method of pouring a damping material between steel materials for bonding a damping material and a steel material using a polyurethane compound and a polyurethane / asphalt composition. In manufacturing the vibration damper, such a pouring method is often used. Depending on the properties of the vibration damping material, it is heated to a high temperature for the purpose of sufficiently lowering the viscosity of the vibration damping material, and so-called hot melt processing is performed. In such cases, due to the fact that the melt viscosity does not decrease sufficiently,
It is known as a finding that a sufficiently defoamed sample cannot be obtained, and a sample in which bubbles remain remains as a starting point of material destruction. Therefore, it is a big problem when it is used for a vibration control damper that is subjected to repeated shear deformation. Although it is possible to lower the melt viscosity by heating the damping material at a high temperature, the damping material is usually
Most of them contain a synthetic resin, and when heated above the heat resistant temperature of the synthetic resin, the originally expected performance does not appear due to thermal deterioration. In addition, JP-A-11-199714
In the publication, a method of heating and pressurizing with a press is described for adhesion of a high damping rubber composed of a styrene elastomer / rubber composition. However, these methods both require large-scale equipment and require heating at a high temperature, which is a problem to be improved from the viewpoint of energy cost.

On the other hand, the fact that a damping material can be obtained from a styrene-isobutylene block copolymer is described in WO93 / 1.
Although it is described in Japanese Patent No. 4135 and Japanese Patent Laid-Open No. 7-137194, all of these publications only disclose that they can be used as a general vibration damping material, and are similar to vibration damping dampers in the construction field. Regarding the use in applications where special characteristics are required, no knowledge including the bonding method has been obtained.

[0005]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, it is an object of the present invention to bond a damping material composition and a steel material by a simpler method without using a hot melt bonding method. It is in.

[0006]

Means for Solving the Problems That is, the present invention provides a damping material composition containing a block copolymer composed of a polymer block mainly containing isobutylene and a polymer block mainly containing an aromatic vinyl compound. A method for adhering a damping material composition, characterized in that A) and a steel material (B) are attached with a double-sided adhesive tape (C). The vibration damping composition (A) may contain a diblock copolymer having a structure of a polymer block mainly containing isobutylene-a polymer block mainly containing an aromatic vinyl compound. The adhesive tape (C) preferably has an adhesive layer of at least one selected from butyl rubber, natural rubber, and acrylic.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a damping material composition (A) containing a block copolymer composed of a polymer block mainly containing isobutylene and a polymer block mainly containing an aromatic vinyl compound. The adhesive method is characterized in that a steel material (B) is attached with a double-sided adhesive tape (C).
The steel material (B) here is a concept including a steel plate, a steel pipe, and the like.

The structure of the block copolymer composed of a polymer block mainly containing isobutylene and a polymer block mainly containing an aromatic vinyl compound which can be used in the present invention has a linear, branched or star structure. Any of block copolymers, diblock copolymers, triblock copolymers, multi-block copolymers, etc. having a structure such as can be selected, and physical properties such as viscoelastic properties, maximum strain rate, shear strength, etc. It is sufficient to select one that meets the requirements for workability. From the viewpoint of processability and the ease of production, a polymer block mainly containing an aromatic vinyl compound-a polymer block mainly containing isobutylene-a polymer block mainly containing an aromatic vinyl compound A triblock copolymer formed and a diblock copolymer formed from a polymer block mainly containing isobutylene-a polymer block mainly containing an aromatic vinyl compound are preferable. Among these, the temperature dependence of the rigidity near room temperature is not reduced, and
It is particularly preferable to use a diblock copolymer formed from a polymer block mainly containing isobutylene-a polymer block mainly containing an aromatic vinyl compound for the purpose of improving the damping property at about 40 ° C. This is because the polymer block mainly composed of isobutylene is present at the terminal, the mobility of the polymer block is improved, and a phase highly mixed with the polymer block mainly composed of an aromatic vinyl compound is formed. By doing so, a new Tg is expressed in the intermediate region between the Tg of the polymer block mainly containing isobutylene and the Tg of the polymer block mainly containing the aromatic vinyl compound.

The isobutylene-based block copolymer of the isobutylene-based block copolymer usable in the present invention is a block containing 60% by weight or more, preferably 80% by weight or more of isobutylene. The body is not particularly limited as long as it is a cationically polymerizable monomer, and examples thereof include monomers such as aromatic vinyl compounds, diene compounds, vinyl ether, and β-pinene. These may be used alone or in combination of two or more.

The polymer block mainly composed of an aromatic vinyl compound of the isobutylene block copolymer is a block containing an aromatic vinyl compound in an amount of 60% by weight or more, preferably 80% by weight or more. The monomer other than the aromatic vinyl compound is not particularly limited as long as it is a cationically polymerizable monomer component, isobutylene,
Examples include monomers such as diene compounds, vinyl ether, and β-pinene. These may be used alone or in combination of two or more.

The aromatic vinyl compound in the polymer block mainly composed of the aromatic vinyl compound is at least one unit selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene and indene. It is preferable to use the body, and styrene, α-
It is particularly preferable to use methylstyrene or a mixture thereof.

The ratio of the polymer block mainly containing isobutylene to the polymer block mainly containing an aromatic vinyl compound is not particularly limited, but a polymer mainly containing isobutylene is used in view of balance between physical properties and processability. It is preferable that the block is 90 to 50% by weight, the polymer block mainly containing an aromatic vinyl compound is 10 to 50% by weight, and the polymer block mainly containing isobutylene is 85 to 60% by weight, the aromatic vinyl is It is particularly preferable that the content of the polymer block mainly containing the compound is 15 to 40% by weight.

The number average molecular weight of the isobutylene block copolymer is not particularly limited, but from the viewpoint of physical properties and processability, it is preferably 5,000 to 500,000, and 10,000 to 200,000. It is particularly preferable that When the number average molecular weight of the isobutylene-based block copolymer is lower than the above range, the physical properties of the composition are not sufficiently expressed, while when it exceeds the above range, it is disadvantageous in terms of processability.

For the purpose of improving the adhesion of the composition of the present invention to a steel plate or a steel pipe, it is preferable to use an isobutylene block copolymer having various functional groups in the molecular chain or at the terminal of the molecular chain. it can. As the functional group, for example, an epoxy group, a hydroxyl group, an amino group, an alkylamino group, an ether group such as an alkoxyl group, a carboxyl group,
Examples thereof include ester groups such as alkoxycarbonyl groups and acyloxyl groups, carbamoyl groups, alkylcarbamoyl groups, amide groups such as acylamino groups, acid anhydride groups such as maleic anhydride, silyl groups, allyl groups and vinyl groups. The isobutylene-based block copolymer may have only one type of these functional groups, or may have two or more types. From the viewpoint of physical property balance and the like, preferable functional groups include:
Examples thereof include an epoxy group, amino group, ether group, ester group, amide group, silyl group, allyl group, and vinyl group.

The method for producing the isobutylene block copolymer is not particularly limited, but for example, the method described in US Pat. No. 4,946,899 may be followed.

The damping material composition of the present invention may contain any component other than the isobutylene block copolymer as long as it is a composition containing the isobutylene block copolymer. Examples thereof include thermoplastic polymers such as thermoplastic resins and thermoplastic elastomers, tackifying resins, plasticizers, fillers and the like.

As the thermoplastic resin, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-
Hexene copolymer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, natural rubber, diene Polymer rubber, olefin polymer rubber,
Examples thereof include acrylic rubber and urethane rubber. As the diene rubber, isoprene rubber, butadiene rubber, 1,
2-polybutadiene, styrene-butadiene rubber, chloroprene rubber, nitrile rubber and the like are exemplified. Examples of the olefin rubber include butyl rubber, halogenated butyl rubber, ethylene-propylene-diene rubber and the like. Among these, from the aspect of compatibility with the isobutylene block copolymer, ethylene-propylene copolymer,
Ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, high density polyethylene, low density polyethylene, linear low Ethylene-based copolymers such as density polyethylene are preferred.

Examples of the thermoplastic elastomer include styrene-based thermoplastic elastomer, olefin-based thermoplastic elastomer, vinyl chloride-based thermoplastic elastomer, urethane-based thermoplastic elastomer, polyester-based thermoplastic elastomer, polyamide-based thermoplastic elastomer and the like. Among these, the styrene-based thermoplastic elastomer is preferable from the viewpoint of compatibility with the isobutylene-based block copolymer. Among the styrene-based thermoplastic elastomers, a polymer block containing an aromatic vinyl compound as a monomer-a conjugated diene monomer, and a polymer block which may be partially hydrogenated-aromatic vinyl-based A triblock copolymer composed of a polymer block containing a compound as a monomer is most preferable because it is industrially easily available. As the aromatic vinyl compound, it is preferable to use at least one monomer selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene, and indene. From the viewpoint of cost, styrene and α-methyl are preferred. It is particularly preferable to use styrene or a mixture thereof. Examples of the monomer used for the polymer block which is composed of a conjugated diene-based monomer and may be partially hydrogenated include butadiene and isoprene. These may be used alone or in combination of two kinds.

The tackifying resin has a number average molecular weight of 30.
0 to 3000, a low molecular weight resin having a softening point of 60 to 150 ° C. based on the ring and ball method defined in JIS K-2207, which is a rosin and a rosin derivative, a polyterpene resin, an aromatic modified terpene resin and hydrides thereof ,
Terpene phenol resin, coumarone indene resin, aliphatic petroleum resin, alicyclic petroleum resin and its hydride, aromatic petroleum resin and its hydride, aliphatic aromatic copolymer petroleum resin, dicyclopentadiene type Examples are petroleum resins and hydrides thereof, and low molecular weight polymers of styrene or substituted styrene. Such a tackifying resin has an effect of moving Tg of a polymer block containing isobutylene as a main component to a high temperature side, and in order to achieve such an object, an isobutylene-based block copolymer is used. It is desirable to add a tackifier resin compatible with a polymer block containing isobutylene as a main monomer component, such as an alicyclic petroleum resin and its hydride, an aliphatic petroleum resin, an aromatic petroleum resin. Hydrogenated petroleum resins, polyterpene resins and the like are preferably used. Even in the same kind of tackifying resin, the higher the softening point, the higher the effect of moving the Tg of the polymer block containing isobutylene of the isobutylene-based block copolymer as the monomer main component to the high temperature side, If the compounding amount of the applied resin is desired to be reduced, the one having a high softening point may be selected, and if it is desired to increase it, the one having a low softening point may be selected.

As the plasticizer, petroleum-based process oils such as paraffin-based process oils, naphthene-based process oils and aromatic process oils, diethyl phthalate,
Examples are dialkyl dibasic acid dioctyl phthalate and dibutyl adipate, low molecular weight liquid polymers such as liquid polybutene and liquid polyisoprene, and any of these can be used. Such a plasticizer has the effect of moving the Tg of the polymer block containing isobutylene as the main monomer component to the low temperature side, and in order to achieve such an object, the isobutylene-based block copolymer It is desirable to add a plasticizer compatible with a polymer block containing isobutylene as a main component, and paraffin-based process oil or liquid polybutene is preferably used.

Examples of the filler include powder fillers such as mica, carbon black, silica, calcium carbonate, talc, graphite, stainless steel and aluminum; fibrous fillers such as glass fiber and metal fiber. . Among them, mica is preferable because it has an effect of improving the damping property. Further, spot welding can be performed by incorporating various metal powders such as stainless powder and aluminum powder, metal fibers, or conductive particles such as carbon black and graphite.

Examples of other compounding agents include stabilizers such as triphenyl phosphite, hindered phenol and dibutyltin maleate; lubricants such as polyethylene wax, polypropylene wax and montanic acid wax;
Flame retardants such as triphenyl phosphate, tricresyl phosphate, decabromobiphenyl, decabromobiphenyl ether and antimony trioxide; pigments such as titanium oxide, zinc sulfide and zinc oxide.

The damping material composition of the present invention not only contains the above-mentioned isobutylene block copolymer, but also has a storage elastic modulus (G) obtained by measurement of dynamic viscoelasticity (dynamic properties) in shear mode. 'ratio of the values in the value and 30 ° C. at 10 ° C. _{in) (G' 10 ℃ / G} '30 ℃) is 5 or less, and,
The loss tangent (tan δ) obtained by the above measurement is 10
It is preferably 0.4 or more at 30 ° C to 30 ° C.

The dynamic viscoelasticity measurement in shear mode is based on JIS
It may be carried out according to K-6394 (Dynamic property test method for vulcanized rubber and thermoplastic rubber). At this time, the frequency needs to be 0.1 to 5 Hz. This corresponds to the frequency of vibrations caused by earthquakes and typhoons on buildings. The storage elastic modulus (G ′) and the loss tangent (tan) obtained by performing the dynamic viscoelasticity measurement in the shear mode in this way
δ) corresponds to the equivalent stiffness (Keq) and the equivalent damping constant (heq) used in the field of construction, G ′ = Keq, tanδ
It is known that there is a relation of = 2 · heq. G '
Represents the rigidity of the damping material, and the larger the value, the higher the rigidity. On the other hand, tan δ represents the damping property of the damping material, and the larger the value, the higher the damping property.

The method for producing the composition used in the present invention is as follows:
The method is not particularly limited, and a method of mechanically mixing using a melting pot equipped with a roll, a Banbury mixer, a kneader, a stirrer or a single-screw or twin-screw extruder can be used. At this time, it is also possible to heat if necessary. Also, add the compounding agent to a suitable solvent,
A method in which a uniform solution of the composition is obtained by stirring this and then the solvent is distilled off can also be used. Further, if necessary, the vibration damping composition can be molded and crosslinked by a press machine or the like.

The vibration damping composition of the present invention can be used as a vibration damping damper for construction in combination with a steel plate or a steel pipe. The material of the steel plate or the steel pipe used in the vibration damper is not particularly limited, but examples thereof include general structural steel plates, cold rolled steel plates, carbon steel plates, stainless steel plates, low alloy steel plates and the like. Further, the structure of the vibration damper, using the vibration damping composition of the present invention as a vibration damping material, a structure in which at least one layer of the vibration damping material and more steel plates than that are alternately laminated, or It is preferable to have a structure in which at least one layer of damping material and more steel pipes than that are laminated concentrically and alternately.

The double-sided pressure-sensitive adhesive tape (C) according to the present invention is not particularly limited as long as it has a structure in which pressure-sensitive adhesive layers are present on both sides.
There is no particular problem with a structure in which a non-woven fabric or a wariff is sandwiched. Examples of the material of the double-sided adhesive tape include acrylic, natural rubber, butyl rubber, EVA, SIS, and silicone. Among these, natural rubber, butyl rubber, acrylic, and the vibration damping material Is more preferable from the viewpoint of self-adhesiveness.

The thickness of the double-sided adhesive tape is 1/3 of the thickness of the viscoelastic material layer so as not to affect the characteristics of the vibration damping material.
It is preferably ˜1 / 10. If the thickness of the double-sided pressure-sensitive adhesive tape is not sufficiently thin, the dynamic characteristics due to the pressure-sensitive adhesive tape layer will be reflected and the original characteristics of the vibration damping material will not be expressed.

The bonding method of the present invention is not particularly limited as long as it is a bonding method in which a damping material composition containing an isobutylene block copolymer and a steel plate are bonded with a double-sided adhesive tape. It may be performed at room temperature or under heated conditions. In addition, a load may be applied to the adhesive surface for the purpose of enhancing the adhesiveness. Also, the curing time may be selected such that the adhesive layer of the adhesive tape is sufficiently wet.

[0030]

The present invention will be described in more detail with reference to the following examples. It should be noted that the present invention is not limited to these embodiments, and various modifications can be made without departing from the scope of the invention.

(Production Example 1 Production of styrene-isobutylene-diblock copolymer) In a 2 L reaction vessel equipped with a stirrer,
589 mL of methylcyclohexane (dried with molecular sieves), 613 mL of n-butyl chloride (dried with molecular sieves), and 0.550 g of cumyl chloride were added. After cooling the reaction vessel to −70 ° C., α-picoline (2-methylpyridine) 0.3
5 mL and 179 mL isobutylene were added. Further, 9.4 mL of titanium tetrachloride was added to start polymerization, and the temperature was -70 ° C.
The solution was reacted for 2.0 hours with stirring. Next, 59 mL of styrene was added to the reaction solution, the reaction was continued for another 60 minutes, and then a large amount of methanol was added to stop the reaction. After removing the solvent and the like from the reaction solution, the polymer was dissolved in toluene and washed twice with water. The toluene solution was added to a methanol mixture to precipitate a polymer, and the obtained polymer was vacuum dried at 60 ° C. for 24 hours to obtain an isobutylene block copolymer (diblock body) (hereinafter referred to as SIB). (Omitted).

The number average molecular weight of the obtained SIB is 48.0.
And the molecular weight distribution was 1.12. The number average molecular weight was measured by Waters 510 type GPC system (chloroform was used as a solvent, and the flow rate was 1 mL / min), and the value in terms of polystyrene was shown.

Production Example 2 Production of Damping Material SIB produced in Production Example 1, SEPS (polystyrene-hydrogenated polyisoprene-polystyrene triblock copolymer), tackifying resin, paraffin-based process oil, EPR (ethylene) -Propylene rubber) at the compounding ratio shown in Table 1 is 1
A rubber composition was manufactured by kneading for 15 minutes with a Labo Plastomill (manufactured by Toyo Seiki Co., Ltd.) set at 70 ° C. The rubber composition was compression molded at 170 ° C. to prepare a sheet. The moldability was extremely good.

[0034]

[Table 1]

(Examples 1 to 3) The damping material prepared in Production Example 2 was adhered to a steel plate via an adhesive tape. The shape of the part including the thickness of the double-sided adhesive tape in the damping material is 50 mm
It was adjusted to be × 50 mm × 5 mm (thickness). After standing at room temperature for 1 day, measurement of dynamic characteristic value and destructive test were performed. Servo pulser EHF-E10 (manufactured by Shimadzu Corporation) was used for the measurement. The fracture test is performed by increasing the shear strain from 400% to 100% at 20 ° C. 9
It was loaded up to 00%, the dynamic characteristic value at that time was calculated, and the strain at which the maximum load was lowered was defined as "break strain". Also, from the state of the sample after loading up to 900%,
It was visually judged whether "interfacial peeling" or "cohesive failure". The measurement frequency was 0.5 Hz. The adhesive tapes used were Super Butyl Tape 5931 (Butyl rubber, Sliontech), NW-N50 (Rubber, Nichiban), VHB Y-4952 (Acrylic, Sumitomo 3M).
Manufacture) (Comparative Examples 1 to 3) In Examples 1 to 3, samples were prepared by press working or melt bonding without using an adhesive tape, and dynamic characteristics were calculated and a destructive test was performed. The press working was performed at room temperature under a load of 50 kg / cm ² . Melt bonding was performed in an oven at 150 ° C or 200 ° C.

(Examples 4 to 6 and Comparative Examples 4 to 6) Example 1
~ 3, 7 to the samples prepared in the same manner as Comparative Examples 4-6
The sample was loaded with a large shear strain of 50% for 3 cycles, and the extent of material fracture was observed from the change in G ′ (storage elastic modulus) before and after the loading.

[0037]

[Table 2]

While Comparative Examples 1 to 3 have problems in defoaming property, breaking state and breaking strain, Examples 1 to 3 have good defoaming property and breaking state, and in the breaking strain, press molding and Better than fusion bonding.

[0039]

[Table 3]

In Comparative Examples 4 and 5, 750% loading causes interface peeling, and in Comparative Example 6, the G ′ retention rate after loading is 80% or less, while Examples 4 to 6 maintain about 90%. Therefore, even if a large-amplitude load is applied during an earthquake, the vibration control performance after that is maintained at a high level.

[0041]

The method for adhering the vibration damping composition of the present invention uses an adhesive tape between the vibration damping composition and the steel material.
Excellent adhesiveness can be developed more easily than hot-melt or press-bonding methods, and the amount of deformation that leads to breakage when sheared is improved. A vibration damper can be provided.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09J 133/00 C09J 133/00 F term (reference) 3J048 BD04 BD06 EA38 4F100 AB01B AK08 AK08A AK11A AK12 AL02 AL02A AN01C AN02C AR00C BA03 BA07 BA10A CB05C EC182 GB07 JH02 4J004 AA04 AA05 AA07 AA09 AA10 AA11 AB01 BA02 CB01 EA05 FA08 4J040 CA011 DA051 DA141 DE031 DF041 DM011 EK031 JA09 JB09 LA06 MA03 MA10 NA12 PA23

Claims (4)

[Claims] 1. A vibration damping composition (A) containing a block copolymer comprising a polymer block mainly containing isobutylene and a polymer block mainly containing an aromatic vinyl compound.
And a steel material (B) are attached with a double-sided pressure-sensitive adhesive tape (C). 2. A composition in which the vibration damping composition (A) contains a diblock copolymer having a structure of a polymer block mainly containing isobutylene-a polymer block mainly containing an aromatic vinyl compound. The method for adhering the damping material composition according to claim 1, wherein 3. The damping material composition according to claim 1, wherein the adhesive layer of the double-sided adhesive tape (C) is at least one selected from the group consisting of butyl rubber, natural rubber and acrylic. Adhesion method. 4. A vibration damper made by using the method for bonding a vibration damping composition according to claim 1.