Silicone composition for vibration damping dampers, viscous fluid for vibration damping dampers, and vibration damping dampers

Abstract

To provide a silicone composition for vibration dampers that exhibits little viscosity change with temperature fluctuations, can provide high damping in small quantities even under high-temperature conditions, and is also superior in load bearing, adhesion, and workability, to provide a viscous fluid for vibration dampers, and to provide a vibration damper.SOLUTION: A silicone composition for vibration dampers includes the following (A) and (B) as the main components and also includes the following (C)-(E). (A) Linear terminal vinyl group-modified silicone. (B) Branched silicone. (C) Platinum catalyst. (D) Retarder. (E) Chain extender.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a silicone composition for a vibration damping damper, a viscous fluid for a vibration damping damper, and a vibration damping damper. More specifically, the present invention relates to a silicone composition for a vibration damping damper, a viscous fluid for a vibration damping damper, and a vibration damping damper suitable for applications such as seismic isolation and vibration isolation in the civil engineering and construction fields.

Background Art

[0002] Vibration damping dampers used in seismic isolation devices and vibration isolation devices in the civil engineering and construction fields, especially those used in large-scale buildings such as bridges and buildings, are used for the purpose of suppressing vibrations caused by earthquakes, winds, etc., and traffic vibrations caused by the running of large vehicles, etc. In order to absorb the energy of a major earthquake, high strain and high damping are essential. However, many small and medium-sized earthquakes occur after a major earthquake. As in the case of long-period earthquakes observed in high-rise buildings, there is an increasing need for characteristic stabilization even for repeated deformations caused by the small and medium-sized earthquakes. As mechanisms of vibration damping dampers used for such applications, viscoelastic dampers, viscous dampers, oil dampers, steel dampers, etc. are mainly mentioned. Among them, viscous dampers have a large damping force and excellent repeatability, and since only the viscous term exists, the design is simple and they are widely introduced in large-scale facilities such as high-rise buildings.

[0003] As the viscous body used for the viscous damper, for example, those using polybutene-based materials such as polyisobutylene are common (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, because polybutene-based materials are highly temperature-dependent, a large amount of polybutene-based material is needed in viscous dampers to achieve high damping performance in high-temperature environments (above 30°C). Therefore, when using polybutene-based materials as the viscous material in viscous dampers, the equipment needs to be scaled up in proportion to the increased amount of polybutene-based material used.

[0006] Furthermore, because polybutene-based materials are highly temperature-dependent, when filling vibration dampers such as seismic isolation walls with polybutene-based materials, they must first be heated to 130-170°C to reduce their viscosity before they can be filled. Thus, there is also the problem of the extra effort required for heating during construction.

[0007] Therefore, the inventors considered using silicone, which has low temperature dependence, as the material for the viscous body. However, the characteristics of silicone—low strength and high non-stick properties—present weaknesses when used in viscous dampers. These include poor load-bearing capacity and reduced damping performance during vibration due to low adhesion to the damper's metal components. Therefore, further consideration is needed in this regard.

[0008] This invention has been made in view of these circumstances, and aims to provide a silicone composition for vibration damping dampers, a viscous fluid for vibration damping dampers, and a vibration damping damper that exhibit little viscosity change due to temperature changes, can produce high damping with a small amount even in high-temperature environments, and further has excellent load-bearing capacity, adhesion, and workability. [Means for solving the problem]

[0009] The inventors diligently conducted research to solve the aforementioned problems. In the course of this research, they adopted a viscous damper as the vibration damping mechanism of the vibration damping damper, as described above, and considered using silicone, which has low temperature dependence, as the viscous material. They then conducted various experiments and research to create a viscous material that exhibits little viscosity change due to temperature changes, can produce high damping with a small amount even in high-temperature environments, and furthermore, has excellent load-bearing capacity, adhesion, and workability. As a result, we developed a silicone composition containing a main component made by using a combination of linear vinyl-modified silicone (A) and branched silicone (B) as the viscous material, along with a platinum catalyst (C), a retarder (D), and a chain extender (E). As the polymerization reaction (viscous fluidization) of the developed silicone composition progresses, as shown in Figure 3, the branched silicone (B) (12) coexists with the linear silicone (11 in the figure) whose molecular weight has been increased by the polymerization reaction (two-dimensional crosslinking reaction) of (A) and (E). Furthermore, we found that the branched silicone 12, due to its molecular structure, easily entangles with the linear silicone 11, and this entanglement improves the load-bearing capacity, which is a weakness of silicone. In addition, we found that the combined use of branched silicone 12 increases the number of polymer ends that contribute to adhesion, thereby improving adhesion. Furthermore, the viscous fluid (viscous fluid for vibration damping dampers) made from the aforementioned silicone composition exhibits more than twice the viscosity of conventional viscous fluids using polybutene-based materials, achieving high damping and significantly reducing temperature dependence compared to polybutene-based materials. As a result, the intended objectives were achieved.

[0010] However, the gist of the present invention is as follows: [1] to

[12] . [1] A silicone composition for vibration damping dampers, comprising (A) and (B) below as the main components and containing (C) to (E) below. (A) Linear vinyl-modified silicone at both ends. (B) Branched silicone. (C) Platinum catalyst. (D) Delay agent. (E) Chain extender. [2] The silicone composition for vibration damping dampers according to [1], wherein (B) is a reaction product of a crosslinking agent having three or more hydrosilyl groups in one molecule and a linear vinyl-terminal modified silicone. [3] The silicone composition for vibration damping according to [2], wherein the ratio (a:b) of the mass a of (A) to the mass b of the linear vinyl group modified silicone at both ends constituting (B) is a:b = 95:5 to 10:90. [4] The silicone composition for vibration damping according to any one of [1] to [3], wherein the viscosity of (A) at 30°C is 2,000 to 1,000,000 mPa·s. [5] A silicone composition for vibration damping according to any one of [2] to [4], wherein the viscosity of the linear vinyl group-modified silicone constituting (B) at 30°C is 2,000 to 1,000,000 mPa·s. [6] The silicone composition for vibration damping according to any one of [1] to [5], wherein the content of (C) is 0.00003 to 0.003 parts by mass per 100 parts by mass of (A). [7] The silicone composition for vibration damping according to any one of [1] to [6], wherein the content of (D) is 0.01 to 1 part by mass per 100 parts by mass of (A). [8] The silicone composition for vibration damping according to any one of [1] to [7], wherein the molar ratio of (E) to (A) in the silicone composition for vibration damping is 0.01 to 4. A viscous fluid for vibration damping, obtained by polymerizing a silicone composition for vibration damping described in any of [9] [1] to [8].

[10] A viscous fluid for vibration damping dampers as described in [9], wherein the viscosity at 30°C is 6,000 to 150,000 Pa·s. A vibration damping damper filled with the viscous fluid for vibration damping dampers described in

[11] [9] or

[10] .

[12] A seismic damping wall, as described in

[11] . [Effects of the Invention]

[0011] From the above, the silicone composition for a vibration damping damper of the present invention has little change in viscosity due to temperature changes, can exhibit high damping with a small amount even in a high-temperature environment, and can further exhibit excellent performance as a viscous fluid material with excellent load resistance and adhesion. In addition, since the silicone composition for a vibration damping damper of the present invention reacts even at normal temperature, it can be filled into a vibration damping damper such as a vibration damping wall in a state of low viscosity, and can be polymerized at normal temperature inside the vibration damping damper. Moreover, since there is no need for the trouble of once heating to lower the viscosity before filling, it is advantageous in construction. And the vibration damping damper of the present invention is filled with the viscous fluid, and since high damping can be exhibited even with a small filling amount, it can be miniaturized compared to a viscous damper using a conventional polybutene-based material. Also, since there is little variation in damping performance due to temperature changes (particularly, a decrease in damping performance in a high-temperature environment can be suppressed), it can exhibit excellent performance as a vibration damping damper.

Brief Description of the Drawings

[0012] [Figure 1] It is a perspective view schematically showing an example of a vibration damping wall. [Figure 2] It is a perspective view showing the state before assembly of the vibration damping wall. [Figure 3] It is an explanatory view schematically showing the dispersion state of the polymer.

Modes for Carrying Out the Invention

[0013] Next, embodiments of the present invention will be described in detail. However, the present invention is not limited to this embodiment. In the present invention, when expressed as "X to Y" (X and Y are arbitrary numbers), unless otherwise specified, it includes the meaning of "X or more and Y or less", and also the meaning of "preferably larger than X" or "preferably smaller than Y". In addition, when expressed as "X or more" (X is any number) or "Y or less" (Y is any number), it also includes the intention of "preferably greater than X" or "preferably less than Y".

[0014] The silicone composition for a vibration damping damper of the present invention (hereinafter referred to as "this silicone composition") is a silicone composition containing the following (A) and (B) as main components and containing the following (C) to (E). (A) Linear both-end vinyl group-modified silicone. (B) Branched silicone. (C) Platinum catalyst. (D) Retarder. (E) Chain extender.

[0015] Here, the phrase "containing (A) and (B) as main components" means that the total mass of (A) and (B) occupies a ratio exceeding 90% with respect to the total mass of (A) to (E) which are essential components of this silicone composition, preferably occupies 92 to 98% by mass, and more preferably occupies 94 to 97% by mass. In addition, when the branched silicone of (B) is synthesized using a linear both-end vinyl group-modified silicone, the linear both-end vinyl group-modified silicone as its material is not included in (A).

[0016] Hereinafter, the constituent materials of this silicone composition will be described in detail.

[0017] 《Linear both-end vinyl group-modified silicone (A)》 As the linear both-end vinyl group-modified silicone (A), a silicone having a linear molecular structure and having vinyl groups at both ends thereof is used. For example, a vinyl group-modified silicone represented by the following general formula (1) is used.

[0018]

Chemical formula

[0019] In the general formula (1) above, n is preferably an integer between 50 and 5000, more preferably an integer between 80 and 4000, and even more preferably an integer between 100 and 3000. This is because if the value of n is too small, the reaction becomes too fast, and if the value of n is too large, the reaction becomes too slow.

[0020] Furthermore, the viscosity of the linear vinyl-terminal silicone (A) described above at 30°C is preferably 400 to 5,000,000 mPa·s. More preferably, the viscosity is 500 to 4,000,000 mPa·s, and even more preferably 1,000 to 1,000,000 mPa·s. In other words, exhibiting the viscosity described above further improves the damping characteristics. The viscosity was measured at a measurement temperature of 30°C using a rotary rheometer (TA Instruments, ARES-G2).

[0021] Branched silicone (B) The branched silicone (B) is not particularly limited, but preferably, a reaction product of a crosslinking agent having three or more hydrosilyl groups in one molecule and a linear, double-ended vinyl-modified silicone is used. Here, the linear vinyl-modified silicone used as the constituent material of the branched silicone (B) is preferably the same as that of (A). For this reason, the vinyl-modified silicone represented by the following general formula (1) is preferably used.

[0022] [ka]

[0023] In the general formula (1) above, n is preferably an integer between 50 and 5000, more preferably an integer between 80 and 4000, and even more preferably an integer between 100 and 3000. This is because if the value of n is too small, the reaction becomes too fast, and if the value of n is too large, the reaction becomes too slow.

[0024] Furthermore, the viscosity of the linear vinyl-modified silicone at both ends used as a constituent material of the branched silicone (B) is preferably 400 to 5,000,000 mPa·s at 30°C. More preferably, the viscosity is 500 to 4,000,000 mPa·s, and even more preferably 1,000 to 1,000,000 mPa·s. In other words, exhibiting the above viscosity further improves the damping characteristics. The viscosity was measured at a measurement temperature of 30°C using a rotary rheometer (TA Instruments, ARES-G2).

[0025] Next, as the crosslinking agent used as a constituent material of the branched silicone (B), as mentioned above, a crosslinking agent having three or more hydrosilyl groups in one molecule is used. Examples of such crosslinking agents include compounds having hydrosilyl groups at one or both ends of their molecular chain and also having hydrosilyl groups in the molecular chain, and compounds that do not have hydrosilyl groups at the ends of the molecular chain but have three or more hydrosilyl groups only in the molecular chain. Here, as a compound that does not have a hydrosilyl group at the end of the molecular chain but has three or more hydrosilyl groups only within the molecular chain, for example, the compound represented by the following general formula (2) can be used. In the following general formula (2), n and m are arbitrary integers.

[0026] [ka]

[0027] The amount of hydrosilyl groups in the crosslinking agent is preferably in the range of 0.015 to 0.4 mmol / g, and more preferably in the range of 0.02 to 0.11 mmol / g.

[0028] As crosslinking agents as described above, commercially available options such as KF-9901 manufactured by Shin-Etsu Chemical Co., Ltd. and Crosslinker 100 manufactured by Evonik Corporation are preferably used.

[0029] Furthermore, the molar ratio of the crosslinking agent to the linear vinyl-modified silicone at both ends used as a constituent material of the branched silicone (B) is preferably 0.01 to 4, and more preferably 0.01 to 3. By reacting the crosslinking agent in this proportion, the desired branched silicone (B) can be obtained successfully.

[0030] The branched silicone (B) can usually be obtained by reacting a crosslinking agent having three or more hydrosilyl groups in one molecule, a linear vinyl-modified silicone with vinyl groups at both ends, a platinum catalyst, a retarder, etc., with a mixture of these components in an atmosphere of 5 to 35°C using a blade agitator, kneader, planetary mixer, mixing roll, twin-screw agitator, etc. Here, the platinum catalyst is not particularly limited, but it is preferably the same as the platinum catalyst (C) which is an essential component of this silicone composition. Similarly, the retarder is not particularly limited, but it is preferably the same as the retarder (D) which is an essential component of this silicone composition. Furthermore, when obtaining the branched silicone (B), the proportion of the platinum catalyst is preferably 0.00003 to 0.005 parts by mass, and more preferably 0.00009 to 0.003 parts by mass, per 100 parts by mass of the linear vinyl group-modified silicone at both ends. Furthermore, when obtaining the branched silicone (B), the proportion of the retarder is preferably 0.01 to 1 part by mass, and more preferably 0.05 to 0.5 parts by mass, per 100 parts by mass of the linear vinyl group-modified silicone at both ends.

[0031] The viscosity of the branched silicone (B) obtained in this manner is preferably 400 to 5,000,000 mPa·s at 30°C. More preferably, the viscosity is 500 to 4,000,000 mPa·s, and even more preferably 1,000 to 1,000,000 mPa·s. In other words, exhibiting the above viscosity further improves the damping characteristics. The viscosity was measured at a measurement temperature of 30°C using a rotary rheometer (TA Instruments, ARES-G2).

[0032] In this silicone composition, the ratio (a:b) of the mass a of the linear vinyl-modified silicone (A) (excluding the linear vinyl-modified silicone constituting the branched silicone (B); the same applies hereinafter) to the mass b of the linear vinyl-modified silicone constituting the branched silicone (B) is preferably in the range of a:b = 95:5 to 10:90, more preferably a:b = 90:10 to 15:85, and even more preferably a:b = 80:20 to 20:80. Blending (A) and (B) within this range is desirable because it yields excellent results in both load-bearing capacity and adhesion required for this silicone composition.

[0033] 《Platinum catalyst (C)》 The platinum catalyst (C) incorporated into this silicone composition may include, for example, platinum-olefin complexes, chloroplatinic acid, elemental platinum, solid platinum supported on a carrier (alumina, silica, carbon black, etc.), platinum-vinylsiloxane complexes, platinum-phosphine complexes, platinum-phosphine complexes, etc., which may be used individually or in combination of two or more. Furthermore, the platinum catalyst (C) may be used in a form dissolved in a solvent such as xylene or toluene. Examples of commercially available products include SIP6830 manufactured by Gelest.

[0034] Furthermore, the content ratio of the platinum catalyst (C) per 100 parts by mass of the linear vinyl-terminal silicone (A) is preferably 0.00003 to 0.003 parts by mass, more preferably 0.00006 to 0.0027 parts by mass, and even more preferably 0.00009 to 0.0024 parts by mass. That is, by keeping the content of the platinum catalyst (C) within this range, the polymerization reaction of the silicone composition (polymerization reaction of component (A) and component (E)) can be suppressed from proceeding too rapidly, while the polymerization reaction can be carried out sufficiently, thereby suppressing variations in the viscosity of the polymer and making it possible to obtain the desired viscosity (desired high damping properties). Furthermore, the content ratio of the platinum catalyst (C) refers to the amount of the platinum catalyst itself, without including solvents such as xylene and toluene as described above.

[0035] Delaying agent (D) As the retarder (D), for example, compounds containing aliphatic unsaturated bonds, organophosphorus compounds, organosulfur compounds, nitrogen-containing compounds, tin compounds, organic peroxides, etc., can be used alone or in combination of two or more.

[0036] Examples of compounds containing aliphatic unsaturated bonds include alcohols containing aliphatic unsaturated bonds such as acetylene alcohol and 1-ethynyl-1-cyclohexanol, and maleic acid esters such as maleic anhydride and dimethyl maleate.

[0037] Furthermore, specific examples of the organophosphorus compounds include triorganophosphines, diorganophosphines, organophosphons, triorganophosphites, and the like.

[0038] Furthermore, specific examples of the aforementioned organic sulfur compounds include organomercaptans, diorganosulfides, hydrogen sulfide, benzothiazole, thiazole, and benzothiazole disulfide.

[0039] Furthermore, specific examples of nitrogen-containing compounds include N,N,N',N'-tetramethylethylenediamine, N,N-dimethylethylenediamine, N,N-diethylethylenediamine, N,N-dibutylethylenediamine, N,N-dibutyl-1,3-propanediamine, N,N-dimethyl-1,3-propanediamine, N,N,N',N'-tetraethylethylenediamine, N,N-dibutyl-1,4-butanediamine, and 2,2'-bipyridine.

[0040] Furthermore, specific examples of the tin-based compounds include stannous halide dihydrate and stannous carboxylate.

[0041] Furthermore, specific examples of the aforementioned organic peroxides include di-t-butyl peroxide, dicumyl peroxide, benzoyl peroxide, and t-butyl perbenzoate.

[0042] Among the various retarders mentioned above, compounds containing aliphatic unsaturated bonds are preferred from the viewpoint of versatility, more preferably alcohols containing aliphatic unsaturated bonds, and particularly preferably acetylene alcohol.

[0043] Furthermore, the content ratio of the retarder (D) per 100 parts by mass of the linear vinyl-terminally modified silicone (A) is preferably 0.01 to 1 part by mass, and more preferably in the range of 0.05 to 0.5 parts by mass. That is, by adding the retarder (D) within the above range, the polymerization reaction between the linear vinyl-terminally modified silicone (A) and the chain extender (E) is suppressed, the variation in the viscosity of the polymer is suppressed, and the desired viscosity (desired high damping properties) can be obtained.

[0044] Chain extender (E) Examples of the chain extender (E) include low molecular weight compounds having hydrosilyl groups (Si-H groups) at both ends of the molecular chain, as shown in the general formula (3) below.

[0045] [ka]

[0046] In the general formula (3) above, n is preferably an integer between 1 and 100, more preferably an integer between 1 and 90, and even more preferably an integer between 1 and 80. This is because if the value of n is too small, the reaction will be too fast, and if the value of n is too large, the reaction will be too slow.

[0047] Furthermore, in this silicone composition, the molar ratio of the chain extender (E) to the linear vinyl-modified silicone (A) is preferably 0.01 to 4, and more preferably 0.1 to 2. In other words, by blending the linear vinyl-modified silicone (A) and the chain extender (E) in the proportions described above, the desired viscosity can be obtained.

[0048] Other ingredients In addition to the components (A) to (E) described above, this silicone composition may also contain various additives as needed, such as fillers, liquid polymers other than silicone, defoaming agents, rheology control agents, internal adhesives, and coupling agents, as long as they do not impair the effects of the present invention.

[0049] Examples of the aforementioned fillers include carbon black, silica, talc, calcium carbonate, carbon fibers, and carbon nanotubes, which can be used individually or in combination of two or more.

[0050] The appropriate proportion of the filler blended into this silicone composition is preferably in the range of 1 to 100 parts by mass, and more preferably in the range of 5 to 50 parts by mass, per 100 parts by mass of the linear vinyl-terminal silicone (A). With such a proportion, the damping characteristics are further improved.

[0051] Examples of liquid polymers other than silicone include liquid isoprene rubber (liquid IR), liquid butadiene rubber (liquid BR), liquid styrene-butadiene rubber (liquid SBR), liquid styrene-isoprene rubber (liquid SI), liquid styrene-ethylene-propylene rubber (liquid SEP), and liquid isoprene-butadiene rubber (liquid IR-BR), which can be used individually or in combination of two or more.

[0052] The content of the liquid polymer appropriately blended into this silicone composition is preferably in the range of 1 to 100 parts by mass, and more preferably in the range of 5 to 50 parts by mass, per 100 parts by mass of the linear vinyl-terminal silicone (A). With such a content ratio, the damping characteristics are further improved.

[0053] This silicone composition can be prepared, for example, by kneading and stirring components (A) to (E), and other components as needed, in an atmosphere of 5 to 35°C using a blade agitator, kneader, planetary mixer, mixing roll, twin-screw agitator, etc. It is preferable that the branched silicone (B) be synthesized in advance by the method described above and then added together with components (A), (C) to (E), etc. The silicone composition obtained in this way undergoes a reaction (increase in molecular weight) even at room temperature (5-35°C), becoming a viscous fluid. Therefore, it can be filled into vibration damping dampers such as seismic damping walls in its low viscosity state immediately after preparation, and its molecular weight can be increased at room temperature within the damper. Moreover, since there is no need to heat the composition to reduce its viscosity before filling, as is done in the past, it is advantageous during construction. Furthermore, the silicone composition prepared as described above will not undergo high molecular weight formation (will not become a viscous fluid) for approximately 12 hours, depending on the temperature, immediately after preparation. In this case, it is possible to transport the pre-prepared silicone composition to the construction site for use. Furthermore, by allowing the silicone composition to stand for 1 to 24 hours in an atmosphere of 5 to 35°C, the polymerization reaction (two-dimensional crosslinking reaction) between component (A) and component (E) is completed, resulting in a high molecular weight and becoming a viscous fluid (viscous fluid for vibration damping dampers; hereinafter referred to as "this viscous fluid").

[0054] Here, the viscosity of the viscous fluid is preferably 6,000 to 100,000 Pa·s at 30°C. More preferably, the viscosity is 6,500 to 80,000 Pa·s, and even more preferably 7,000 to 60,000 Pa·s. In other words, exhibiting the above viscosity further improves the damping characteristics. The viscosity was measured at a measurement temperature of 30°C using a rotary rheometer (TA Instruments, ARES-G2).

[0055] Furthermore, the weight-average molecular weight (Mw) of the polymerization reaction product of components (A) and (E) in this viscous fluid is preferably 80,000 to 2,000,000, and more preferably 100,000 to 1,800,000. In other words, exhibiting the weight-average molecular weight described above further improves the damping characteristics. Furthermore, the molecular weight distribution (weight-average molecular weight (Mw) / number-average molecular weight (Mn)) of the polymerization reaction product is preferably 1.5 to 40, and more preferably 2 to 30, from the viewpoint of more effectively exhibiting the effects of the present invention. Note that the weight-average molecular weight (Mw) is the weight-average molecular weight converted to standard polystyrene molecular weight, and was measured using a high-performance liquid chromatograph (Waters, "Waters 2695 (main unit)" and "Waters 2414 (detector)") with a column: Shodex GPC KF-806L (exclusion limit molecular weight: 2 × 10⁶). 7 Separation range: 100~2×10 7The measurement is performed by using three tubes in series (theoretical plate count: 10,000 stages / tube, filler material: styrene-divinylbenzene copolymer, filler particle size: 10 μm). The number average molecular weight (Mn) is also measured by the same method, and the molecular weight distribution of the polymerization reaction product (weight average molecular weight (Mw) / number average molecular weight (Mn)) can be determined from the number average molecular weight (Mn) and weight average molecular weight (Mw).

[0056] Examples of vibration dampers (hereinafter referred to as "the vibration damper") filled with the viscous fluid prepared as described above include the vibration damping wall shown in Figure 1.

[0057] Figure 1 is a schematic perspective view showing an example of a seismic damping wall. The illustrated seismic damping wall 1 consists of a hanging wall 2 made of one or more plates that are fixed to the framework of the upper floor building structure and hang down, and are separated from the framework of the lower floor building structure, and a rising wall 3 made of multiple plates that are fixed to the framework of the lower floor building structure parallel to the hanging wall 2 and rise up to surround the hanging wall 2, and are separated from the framework of the upper floor building structure, with the viscous fluid being filled into the gap between them. Furthermore, in the case of the seismic damping wall 1 with the structure shown in Figure 1, it is preferable from the viewpoint of the manufacturing process of the seismic damping wall 1 to fill the gap between the hanging wall 2 and the rising wall 3 with the silicone composition and then polymerize it to produce the viscous fluid.

[0058] In addition to steel plates, fiber-reinforced resin plates can be used as materials for the hanging wall 2 and rising wall 3 of the seismic damping wall 1. As the fiber-reinforced resin plate, for example, a thermosetting resin such as unsaturated polyester resin or epoxy resin, or a thermoplastic resin such as polyamide, polypropylene, or ABS resin can be used as the matrix resin, and a resin plate can be used in which glass fibers, carbon fibers, boron fibers, alumina fibers, amide fibers, etc. are dispersed.

[0059] Furthermore, as a specific structure of the seismic damping wall 1, bolt holes (not shown) may be drilled (not shown) through the hanging wall 2 and the rising wall 3 at predetermined intervals along the horizontal and vertical directions of the seismic damping wall 1, and gap adjustment bolts that maintain the gap between the two walls are inserted through these bolt holes in both walls and screwed with nuts, so that the size of the gap between the two walls can be adjusted according to the length of screwing the gap adjustment bolts into the nuts.

[0060] Furthermore, the filling of the seismic damping wall 1 with the silicone composition can be performed before or after the hanging wall 2 is erected onto the rising wall 3, and there are no particular limitations on the method. For example, a filling method before erection could be to install a long inlet pipe from the top of the rising wall 3 into the wall and pour in the silicone composition, or to provide multiple injection ports (not shown) at the bottom of the rising wall 3 and fill the silicone composition from these injection ports using a pump such as a grout injection machine. By these methods, as shown in Figure 2, after the silicone composition (silicone composition 4) has been filled into the rising wall 3, the hanging wall 2 is erected into the rising wall 3, and the polymerization reaction of the silicone composition 4 is completed (it becomes a viscous fluid), thereby completing the seismic damping wall 1. The filling process can be carried out at any time, such as by pre-filling the silicone composition 4 and transporting it to the construction site, or by preparing and filling the silicone composition 4 at the construction site. Furthermore, when filling the silicone composition 4 after installing the hanging wall 2 into the rising wall 3, it is preferable to apply a method of providing an injection port at the lower part of the rising wall 3 and injecting the composition there.

[0061] This vibration damping damper is not limited to the shape shown in the illustration above, but can be of various shapes as long as it uses this silicone composition or this viscous fluid. Furthermore, this vibration damping damper can demonstrate excellent functionality as a vibration damping damper for civil engineering and construction, as well as for home appliances and electronic devices. In particular, it can demonstrate superior functionality as a seismic damper used in large structures such as bridges and buildings, and especially as a seismic damper for high-rise buildings. [Examples]

[0062] Next, examples will be described together with comparative examples. However, the present invention is not limited to these examples unless it exceeds the essence of the invention.

[0063] First, prior to the examples and comparative examples, the following materials were prepared. The numerical values ​​shown for the materials below were measured based on the measurement method described above.

[0064] [Vinyl-modified silicone at both ends (i)] The following general formula (1) represents a double-ended vinyl-modified silicone (Polymer VS 2000 (viscosity at 30°C: 2000 mPa·s), manufactured by Evonik), with n=100 to 300.

[0065] [ka]

[0066] [Vinyl-modified silicone at both ends (ii)] The above general formula (1) represents a vinyl-modified silicone with n=500 to 800 (Polymer VS 10000 (viscosity at 30°C: 10000 mPa·s), manufactured by Evonik).

[0067] [Vinyl-modified silicone at both ends (iii)] The above general formula (1) represents a double-ended vinyl-modified silicone (Polymer VS 65000 (viscosity at 30°C: 65000 mPa·s), manufactured by Evonik) with n = 1100 to 1400.

[0068] [Vinyl-modified silicone at both ends (iv)] The above general formula (1) represents a double-ended vinyl-modified silicone (Polymer VS 100000 (viscosity at 30°C: 100000 mPa·s), manufactured by Evonik), with n = 1350 to 1650.

[0069] [Platinum catalyst] SIP6830, manufactured by Gelest.

[0070] [Delaying agent] Acetylene alcohol (Surfinol 61, manufactured by Nisshin Chemical Industry Co., Ltd.)

[0071] [Chain extender] The chain extender (DMS-H11, manufactured by Evonik) for n=1 to 18, as shown in the general formula (3) below.

[0072] [ka]

[0073] [Crosslinking agent (i)] A crosslinking agent with a hydrosilyl group content of 7 mmol / g, represented by the general formula (2) below (KF-9901, manufactured by Shin-Etsu Chemical Co., Ltd.)

[0074] [ka]

[0075] [Crosslinking agent (ii)] A crosslinking agent represented by the general formula (2) above, with a hydrosilyl group content of 8 mmol / g (Crosslinker 100, manufactured by Evonik).

[0076] [Examples 1-11, Comparative Examples 1, 2] First, the materials shown in Table 1 below were mixed in the proportions shown in the table, and the mixture was stirred with a blade agitator in an atmosphere of 30°C to induce a crosslinking reaction, thereby obtaining branched silicones (I) to (V). The amounts of crosslinking agents shown in Table 1 below are expressed as the molar ratio of the crosslinking agent to the vinyl-modified silicone at both ends. Furthermore, the percentage of platinum catalyst shown in Table 1 below represents the content of the platinum catalyst itself, excluding solvents and other components contained in the chemical agent (SIP6830). Furthermore, the viscosities of the branched silicones (I) to (V) shown in Table 1 below are values ​​measured at a 30°C atmosphere based on the measurement method described above.

[0077] [Table 1]

[0078] Next, the aforementioned materials and the branched silicones (I) to (V) shown in Table 1 were mixed in the proportions shown in Tables 2 and 3 below, and the mixture was stirred with a blade agitator in an atmosphere of 30°C to prepare the silicone compositions of the examples and comparative examples. The amounts of chain extender (E) shown in Tables 2 and 3 below are expressed as the molar ratio of chain extender (E) to the vinyl-modified silicone (A) at both ends. Furthermore, the platinum catalyst (C) content shown in Tables 2 and 3 below represents the content of the platinum catalyst itself, excluding solvents and other components contained in the chemical agent (SIP6830).

[0079] The following properties were measured and evaluated using the silicone compositions of the examples and comparative examples, according to the following criteria. These results are shown in Tables 2 and 3 below.

[0080] ≪Viscosity≫ The prepared silicone composition was polymerized at 30°C for one day, and then its viscosity was measured at 30°C using a rotary rheometer (TA Instruments, ARES-G2).

[0081] ≪Temperature dependence≫ The prepared silicone composition was polymerized at 30°C for one day, and then its viscosity was measured at a measurement temperature of 10°C using a rotary rheometer (TA Instruments, ARES-G2). The same measurement was then performed at a measurement temperature of 30°C, and the ratio of "viscosity at 10°C / viscosity at 30°C" was calculated.

[0082] Dynamic modulus of elasticity The prepared silicone composition was polymerized at 30°C for one day, and then viscoelasticity measurements were performed at 30°C using a rotary rheometer (TA Instruments, ARES-G2), and the maximum value of the dynamic modulus was determined.

[0083] <<Adhesion>> One disc-shaped metal fitting with a diameter of 30 mm and a thickness of 2 mm, and one square metal fitting with a diameter of 50 mm were prepared. The prepared silicone composition was filled between these two metal fittings to a thickness of 1 mm, and left to stand at 30°C for one day to promote the polymerization reaction of the silicone composition. After that, the two metal fittings were pulled apart using a force gauge (Imada Corporation, general-purpose mechanical force gauge). The peeled surfaces of the separated metal fittings were then visually evaluated according to the following criteria. ○: Material degradation of the polymerization reaction product of the silicone composition was observed in more than 50% of the peeled surface. ×: Interfacial delamination or material failure of the polymerization reaction product of the silicone composition was observed in less than 50% of the delamination surface.

[0084] <Overall Rating> Based on the results of each measurement, samples that met all the requirements—viscosity of 6,000 to 100,000 Pa·s, temperature dependence of 2 or less, dynamic modulus of elasticity of 5,000 Pa or more, and adhesion evaluation of "○"—were given an overall evaluation of "○". Samples that did not meet even one of these requirements were given an overall evaluation of "×".

[0085] [Table 2]

[0086] [Table 3]

[0087] From the results in Tables 2 and 3, it can be seen that all of the samples in the examples exhibited high viscosity (6,000 to 100,000 Pa·s) of the viscous fluid after the polymerization reaction was completed, indicating high damping properties, and furthermore, the low temperature dependence of the viscous fluid indicates that viscosity changes with temperature are minimal. In addition, all of the samples in the examples showed high dynamic modulus and good adhesion.

[0088] In contrast, the sample in Comparative Example 1, lacking branched silicone, did not exhibit the desired dynamic modulus and failed to achieve adhesion. The sample in Comparative Example 2 contained only branched silicone and no linear silicone, but this sample also failed to exhibit the desired dynamic modulus. [Industrial applicability]

[0089] The silicone composition and viscous fluid for vibration damping dampers of the present invention can exhibit excellent functionality when used in vibration damping dampers for civil engineering and construction, as well as for home appliances and electronic devices. In particular, they can exhibit even better functionality when used in vibration damping dampers for large structures such as bridges and buildings, and especially for high-rise buildings. Furthermore, vibration damping devices such as vibration-damping walls and seismic isolation devices for buildings, vibration damping materials and shock absorbers for home appliances and electronic devices, and vibration damping materials and shock absorbers for automobiles, which utilize the silicone composition for vibration damping dampers and viscous fluid for vibration damping dampers of the present invention, can also be used as vibration damping dampers of the present invention. [Explanation of Symbols]

[0090] 1 Seismic damping wall 2 hanging wall 3. Rising wall 4. Silicone composition

Claims

1. A silicone composition for vibration damping dampers, comprising (A) and (B) below as the main components and containing (C) to (E) below, wherein (B) is a reaction product of a compound represented by the following formula (2) which does not have a hydrosilyl group at the end of the molecular chain but has three or more hydrosilyl groups only in the molecular chain, and a linear vinyl group modified silicone at both ends. (A) Linear vinyl-modified silicone at both ends. (B) Branched silicone. (C) Platinum catalyst. (D) Delay agent. (E) Chain extender. 【Chemistry 1】 In equation (2) above, n is an integer greater than or equal to 3, and m is any integer.

2. The silicone composition for vibration damping according to claim 1, wherein the ratio (a:b) of the mass a of (A) to the mass b of the linear vinyl group modified silicone at both ends constituting (B) is a:b = 95:5 to 10:

90.

3. The silicone composition for vibration damping according to claim 1 or 2, wherein the viscosity of (A) at 30°C is 2,000 to 100,000 mPa·s.

4. The silicone composition for vibration damping according to any one of claims 1 to 3, wherein the viscosity of the linear vinyl-modified silicone at both ends constituting (B) at 30°C is 2,000 to 100,000 mPa·s.

5. The silicone composition for vibration damping according to any one of claims 1 to 4, wherein the content of (C) is 0.00003 to 0.003 parts by mass per 100 parts by mass of (A).

6. The silicone composition for vibration damping according to any one of claims 1 to 5, wherein the content of (D) is 0.01 to 1 part by mass per 100 parts by mass of (A).

7. The silicone composition for vibration damping according to any one of claims 1 to 6, wherein the molar ratio of (E) to (A) in the silicone composition for vibration damping is 0.01 to 4.

8. A viscous fluid for vibration damping, obtained by polymerizing the silicone composition for vibration damping according to any one of claims 1 to 7.

9. The viscous fluid for vibration damping according to claim 8, wherein the viscosity at 30°C is 6,000 to 150,000 Pa·s.

10. A vibration damping damper filled with the viscous fluid for vibration damping dampers described in claim 8 or 9.

11. A seismic damping wall, as described in claim 10.

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