JP5774815B2 - Vibration isolating member and manufacturing method thereof - Google Patents

Description

  The present invention relates to a vibration isolation member that attenuates vibration transmitted from outside while supporting a vibration isolation object.

As a member for attenuating external vibration transmitted from the floor and preventing malfunction and damage of equipment such as precision measuring instruments, a vibration damping damper combining a coiled spring and a viscoelastic body is known. (Patent Document 1)
Patent Document 1 describes an anti-vibration damper “for example, a coil spring is embedded in a cylindrical silicone gel and a silicone coating is formed on the surface of the silicone gel to obtain a vibration absorber”.

JP-A-9-296846

  In general, to improve the vibration isolation performance of the vibration isolation member, lower the resonance frequency of the vibration isolation member and decrease the response magnification (ratio of acceleration of output vibration to acceleration of input vibration to the vibration isolation member). Is desirable. When using a vibration isolation member combining a coil spring, which is an elastic body, and a viscoelastic body, the resonance frequency is proportional to the spring constant. Therefore, it is preferable to select a coil spring having a small spring constant. The viscoelastic body functions to convert the vibration energy of the spring into heat energy and converge the spring vibration at an early stage, and works to lower the response magnification of the vibration isolation member. On the other hand, since the viscoelastic body also has properties as an elastic body, the resonance frequency is increased when the spring constant of the viscoelastic body is increased. Therefore, it is preferable to use a material having a small spring constant for the viscoelastic body, that is, a material having a small elastic modulus.

  Generally, in a vibration isolation member that combines a coil spring and a viscoelastic body, the height of the viscoelastic body is set to be substantially the same as the height of the coil spring without supporting the vibration isolation object. When supported, the viscoelastic body is compressed together with the coil spring. However, the compression of the compressed viscoelastic body is restricted by its own elasticity or, when the viscoelastic body is received in the container, by the container. As a result, the elastic modulus of the viscoelastic body is increased and the vibration isolation performance of the vibration isolation member is degraded.

  The present invention solves the above-mentioned problems that occur in a vibration isolation member that combines a coil spring and a viscoelastic body, and provides a vibration isolation member that can exhibit high vibration isolation performance while supporting a vibration isolation object. Is.

In one aspect, the present invention is a vibration isolation member that performs vibration isolation while supporting a vibration isolation object, and includes an upper support, a lower support that is spaced apart from the upper support, and an upper support. And a lower support, a coil spring arranged in contact with both ends, an absorbent material accommodating portion provided between the upper support and the lower support, and a viscoelastic material disposed in the absorbent material accommodating portion has the door, before supporting the the dividend Fubutsu, absorbent material accommodating portion is one having a space above the upper end of the viscoelastic body, the height of the natural state of the viscoelastic body, the dividend supports the Fubutsu in which the coil spring provides the set anti-vibration member so as to the height substantially the same as the absorbing material container when contracted.

  According to the vibration isolation member of one aspect of the present invention, the elastic member is substantially not compressed in a state where the vibration isolation member supports the object to be vibration-damped. It can be suppressed and can exhibit good vibration isolation performance.

It is sectional drawing which shows the vibration isolator by the 1st Embodiment of this invention. It is sectional drawing which shows the state in which the vibration isolator of FIG. 1 is supporting the to-be-vibrated object. It is sectional drawing which shows the vibration isolator by the 2nd Embodiment of this invention. It is sectional drawing which shows the state in which the vibration isolator of FIG. 3 is supporting the to-be-vibrated object. It is sectional drawing which shows the vibration isolator by the 3rd Embodiment of this invention. 10 is a graph showing frequency characteristics of the vibration isolation member of Example 4. It is a graph which shows the frequency characteristic of the vibration isolator of the Example 9, Example 10 of this invention, and a comparative example.

  A vibration isolation member according to an embodiment of the present invention is used in a state where a vibration isolation object is supported, and the vibration isolation object is supported while the vibration isolation object is supported by one or a plurality of vibration isolation members. Damping vibration from the floor transmitted to the floor. The vibration isolation member includes an upper support, a lower support disposed away from the upper support, and a coil spring disposed in fixed contact with the upper support and the lower support at both ends. The vibration isolation member further includes an absorbent material accommodating portion provided in parallel with the coil spring between the upper support and the lower support, and the viscoelastic body is disposed in the absorbent material accommodating portion. The height A of the viscoelastic body in the natural state is smaller than the height H ′ of the absorbent material accommodating portion when the vibration isolation member does not support the vibration isolation object, and the vibration isolation member is the vibration isolation object. Is selected so as to be substantially the same as the height H of the absorbent material accommodating portion in a state in which is supported. For this reason, even if the vibration isolation member supports the object to be vibration-damped, the viscoelastic body is not substantially compressed, and a decrease in vibration isolation performance can be minimized.

  The vibration isolation member of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a vibration isolation member according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the vibration isolation member in a state of supporting a vibration isolation object.

  The vibration isolation member 1 includes a lower support 10, an upper support 12 that is spaced apart from the lower support 10, and a coil spring 14 that is disposed between the lower support 10 and the upper support 12. Then, the viscoelastic body 18 is provided in the absorbent material accommodating portion 16 provided between the upper and lower supports 10 and 12 in parallel with the coil spring 14. In the vibration isolation member 1 according to the present embodiment, the height H ′ of the absorbent material accommodating portion 16 in the state in which the vibration isolation object 60 is not supported is larger than the height A of the viscoelastic body 18 in the natural state, The height A of the viscoelastic body 18 and the height H of the absorbent material accommodating portion 16 in a state in which the vibration isolator 60 is supported are substantially equal.

  The coil spring 14 is a spring in which an elastic body such as metal is formed in a spiral shape, and is a compression spring that is used by applying a compression load to the coil spring 14. The coil spring 14 has appropriate characteristics depending on the mass of the vibration isolator to be supported, the number of vibration isolator members to be used, and the frequency characteristics and amplitude of vibration generated at the installation location of the vibration isolator. The coil spring can be selected. As described above, it is preferable to select a coil spring having a small spring constant in order to exhibit an excellent vibration isolation effect with a wide frequency characteristic.

  Each of the upper support 12 and the lower support 10 (hereinafter sometimes simply referred to as a support) can use a substantially plate-like member, and is disposed in contact with both ends of the coil spring 14. Each of the supports 10 and 12 is preferably fixedly attached to the coil spring 14 so that it can be handled integrally with the coil spring 14. The supports 10 and 12 can be made of any material such as metal or plastic. For example, the supports 10 and 12 can be made from a material that is not easily deformed, such as a metal such as iron or aluminum, or an engineering plastic such as a liquid crystal polymer. Here, the upper support 12 and the lower support 10 use substantially plate-like members, but the shape of the support is not necessarily limited to a plate. Both supports may support the coil spring 14 and the viscoelastic body 18, and the lower support 10 may have a shape that can be stably installed on the installation surface on which the lower support 10 is installed. The upper support 12 Then, the shape is not limited as long as the vibration isolation member 60 can be installed.

  For example, the lower support 10 is disposed so that the lower surface 10a of the lower support 10 is in contact with the floor surface 40a of the floor 40 on which the vibration isolation object is installed. The floor surface 40a is not limited to the floor surface of a building or a house, but also includes the ground surface, the surface of a table on which equipment is installed, and the bottom surface of a box. The lower support 10 is not only directly installed on the floor surface 40a, but may be disposed on another member such as a spacer for the purpose of adjusting the installation height. The upper support 12 is a part in contact with the vibration isolator 60. The vibration isolator 60 may be disposed in contact with the upper surface 12b of the upper support 12 or, for example, a bar-shaped attachment member (not shown) is provided on the upper support 12, and the vibration isolator is provided on the attachment member. May be fixed.

  The absorbent material accommodating portion 16 is a space formed in parallel with the coil spring 14 between the upper support 12 and the lower support 10, and a viscoelastic body 18 as a vibration absorber is disposed therein. The absorbent material accommodating portion 16 is not limited to the internal space of the coil spring 14, and the absorbent material accommodating portion 16 may be provided outside the coil spring 14.

  In this embodiment, the viscoelastic body 18 has a cylindrical shape in which sheet-like viscoelastic substances are stacked. The details of the viscoelastic body 18 will be described later.

  In the present embodiment, the height H ′ (the upper surface 10 b of the lower support member 10 and the lower surface 12 a of the upper support member 12) of the absorbent material accommodating portion 16 in a state where the vibration isolation member 1 does not support the vibration isolation object 60. Is greater than the height A of the viscoelastic body 18 in a natural state (a state in which no load other than its own weight is received) (FIG. 1). However, when the vibration isolation member 1 supports the vibration isolation object 60 and the coil spring 14 contracts, the height H of the absorbent material accommodating portion 16 is substantially the same as the height A in the natural state of the viscoelastic body 18. Thus, the height A of the viscoelastic body 18 is set (FIG. 2).

  For example, when considering the case where the vibration isolator 60 is supported by the four vibration isolation members 1, when 1/4 of the mass of the vibration isolator 60 is applied as a load to one vibration isolation member 1, the absorbent material is accommodated. The height A of the viscoelastic body 18 is adjusted so that the height H of the part 16 and the height A in the natural state of the viscoelastic body 18 are substantially equal. By doing so, the viscoelastic body 18 and the upper support member 12 come into contact with each other when the object to be damped 60 is supported, but the viscoelastic body 18 is not substantially compressed by the support members 10 and 12.

Here, in general, the resonance frequency f ₀ of the elastic body can be expressed as f ₀ = (K / m) ^0.5 / 2π. Here, K is a spring constant of the viscoelastic body, and m is a load applied to the viscoelastic body. Further, the spring constant K of the columnar viscoelastic body having a constant cross-sectional area in the compressed direction can be expressed by K = E ′ × S / t. Here, S is the cross-sectional area of the surface perpendicular to the compression direction of the viscoelastic body, t is the height (thickness) of the viscoelastic body in the compression direction, and E ′ is the Young's modulus of the viscoelastic body.

  As can be seen from this equation, the smaller the Young's modulus E 'of the viscoelastic body 18, the smaller the spring constant. As a result, the resonance frequency of the viscoelastic body 18 and the vibration isolator 1 incorporating it can be lowered. When the viscoelastic body 18 is compressed, the Young's modulus increases, and the spring constant of the vibration isolation member 1 increases. However, when the height A of the viscoelastic body 18 is set so that the viscoelastic body 18 is not substantially compressed in a state where the vibration isolation member 1 supports the vibration isolation object 60 as in the present embodiment, the viscoelasticity is set. The low elastic modulus of the body 18 can be used effectively.

  Note that the viscoelastic body 18 is not substantially compressed means that the viscoelastic body 18 is not compressed at all by another member and the viscoelastic body 18 is not significantly damaged by the viscoelastic body 18. This includes a state where 18 is compressed from another member.

  The height A in the natural state of the viscoelastic body 18 is ideally set to be equal to the height H of the absorbent material accommodation portion 16 when the vibration isolator 60 is supported, but the present invention is viscoelastic. The height A in the natural state of the body 18 and the height H of the absorbent material accommodation portion 16 when the vibration isolator 60 is supported are not limited to the same. The upper support member 12 and the viscoelastic body 18 are more reliable as the height A in the natural state of the viscoelastic body 18 is larger than the height H of the absorbent material accommodating portion 16 when the vibration isolator 60 is supported. However, the amount of compression of the viscoelastic body 18 when the vibration isolator 60 is supported is increased and the elastic modulus is increased. Therefore, the height A in the natural state of the viscoelastic body 18 can be 115% or less of the height H of the absorbent material accommodation portion 16 when the vibration isolator 60 is supported, and is preferably 110% or less. 107% or less is more preferable, and 100% or less is more preferable.

  The height A in the natural state of the viscoelastic body 18 only needs to be high enough to allow the viscoelastic body 18 and the upper support member 12 to contact each other while the vibration isolation member 1 is oscillating (during vibration isolation). That is, when the vibration isolation member 1 is vibrating while supporting the vibration isolation object 60, the height of the absorbent material accommodating portion 16 changes in accordance with the period of vibration. The minimum height to be taken and the height A in the natural state of the viscoelastic body 18 are equal to each other, or the height A in the natural state of the viscoelastic body 18 may be larger. More specifically, the height A in the natural state of the viscoelastic body 18 is preferably 90% or more of the height H of the absorbent material accommodating portion 16 when the vibration isolator 60 is supported, and more preferably 95% or more. Preferably, 97% or more is more preferable.

  As described above, when the height A of the viscoelastic body 18 in the natural state and the height H of the absorbent material accommodating portion 16 in the state of supporting the vibration isolator 60 are set to be substantially the same, The response magnification is kept low compared to the case where the height A of the elastic body 18 in the natural state and the height H ′ of the absorbent material accommodating portion 16 in the state in which the vibration isolator 60 is not supported are substantially the same. The resonance frequency can be lowered while remaining. Further, the frequency characteristic of the vibration isolation member 1 configured as described above shows a frequency characteristic in which the response magnification is rapidly reduced when the frequency exceeds the resonance frequency. That is, the frequency characteristic of the response magnification shows a peak that becomes maximum at the resonance frequency, but the peak width is very narrow, and when the frequency increases after the peak value, the response magnification sharply decreases. Therefore, excellent vibration isolation performance can be exhibited even with respect to external vibration close to the resonance frequency of the vibration isolation member 1.

  The viscoelastic body 18 can be composed of any viscoelastic substance having viscoelasticity. The viscoelastic substance generally includes a polymer, and examples of the polymer that can be used include natural or synthetic rubber, silicone polymer, acrylic polymer, urethane polymer, and fluorine-based polymer.

  The viscoelastic body 18 used in the present embodiment has such a viscosity that it can maintain its own shape without being housed in a container or winding a film around the surface. That is, even if it is not accommodated in a container or the like, it can be elastically deformed to the extent of deformation applied during use of the vibration isolation member 1, and the original shape can be recovered when the external force is removed. When such a viscoelastic body 18 is used, there is no need to provide a container for the viscoelastic body 18 and the vibration isolation member 1 can be made small and simple. Furthermore, as will be described later, since deformation of the viscoelastic body 18 is not limited by the container or the like, an increase in the elastic modulus of the viscoelastic body 18 can be effectively suppressed.

  The viscoelastic body 18 is preferably fixedly attached to at least one of the upper and lower supports 10 and 12. Further, the viscoelastic body 18 may have adhesiveness to such an extent that it can adhere to the support members 10 and 12. If the viscoelastic body 18 can adhere to the support members 10 and 12, the viscoelastic body 18 and the lower support member 10 are integrated without providing a fixing member that fixes the viscoelastic body 18 to the lower support member 10. Can be realized. Further, even when the viscoelastic body 18 is subjected to tension, the vibration absorbing performance can be exhibited while maintaining the state in which the viscoelastic body 18 is in contact with the upper support member 12, and the vibration isolation performance of the vibration isolation member 1 can be improved. Can be increased.

  The viscoelastic body 18 is preferably produced by laminating a plurality of viscoelastic substances processed into a sheet shape as in this embodiment. In order to produce the columnar viscoelastic body 18, for example, a method of casting into a mold having a columnar internal space, a method of cutting out after producing a sheet of a viscoelastic material having a thickness equal to the height of the columnar body, etc. Can be considered. However, when the viscoelastic substance is a gel-like substance having a low elastic modulus and high adhesiveness, it may be difficult to produce by the above method. In order to produce by casting, it is difficult to uniformly cure the viscoelastic substance to the center or to release the sticky viscoelastic substance. Even when the columnar body is cut out at a time, the sheet of viscoelastic material is deformed in the cutout process, and it becomes difficult to process it into a desired shape.

  On the other hand, in the method of processing a viscoelastic substance into a thin sheet and laminating it to produce a columnar body, the above difficulty can be avoided. Moreover, when the viscoelastic substance has adhesiveness, the laminated viscoelastic substance can be integrated without using a separate adhesive or the like.

  It is preferable that the viscoelastic body 18 does not come into contact with the coil spring 14 during use (during vibration isolation) and does not stick even when in contact. When the viscoelastic body 18 is compressed by the upper and lower support members 12 and 10 in the vertical direction, the viscoelastic body 18 expands in the horizontal direction accordingly. Conversely, when the viscoelastic body 18 is extended in the vertical direction, it contracts in the horizontal direction. When the expansion / contraction of the viscoelastic body 18 in the lateral direction is restricted, it becomes difficult to contract / expand the viscoelastic body 18 in the vertical direction, and the elastic modulus increases. Therefore, during the operation of the vibration isolation member 1, it is preferable that the viscoelastic body is in contact with the coil spring and the expansion and contraction in the lateral direction is not restricted in order to exhibit excellent vibration isolation performance even at a low frequency. For the same reason, when the viscoelastic body 18 adheres to the coil spring 14, the free expansion / contraction of the viscoelastic body 18 is restricted. Therefore, it is preferable that the viscoelastic body 18 does not adhere to the coil spring 14.

  When using the viscoelastic body 18 which has adhesiveness, it is preferable to process so that the surface 18a of the viscoelastic body 18 other than the surface which contact | connects the support bodies 10 and 12 does not have adhesiveness. Various known processing methods can be used for this processing. For example, a solvent or the like may be applied to the surface 18a of the viscoelastic body 18 to cause a chemical change in the surface 18a, thereby eliminating the adhesiveness. Alternatively, the degree of cross-linking of the surface 18a of the viscoelastic body 18 may be made higher than the degree of cross-linking inside the viscoelastic body 18 to reduce or eliminate the tackiness. Alternatively, another substance, for example, plastic fine particles such as polypropylene or polyethylene, may be attached to the surface of the viscoelastic body 18 to reduce or eliminate the stickiness, or the surface of the viscoelastic body 18 may be flexible. A certain film may be wound.

  If particles that are sufficiently small compared to the height of the viscoelastic body 18 are attached to the viscoelastic body 18 such as fine particles, the adhesiveness is reduced / disappeared without inhibiting the expansion / contraction of the viscoelastic body 18. be able to. Therefore, it is preferable to eliminate the stickiness by attaching a substance such as fine particles smaller than the viscoelastic body 18 to the surface 18a.

  As the viscoelastic substance constituting the viscoelastic body 18, a material having a small Young's modulus E 'is preferable. When the Young's modulus E ′ is small, the spring constant of the viscoelastic body 18 can be reduced. As described above, the size of the viscoelastic body 18 also affects the spring constant K as a parameter. However, if the volume V of the viscoelastic body is decreased to reduce the spring constant, the ability of the viscoelastic body 18 to attenuate vibrations is reduced. Resulting in. Further, there is a limit to the range in which the volume of the viscoelastic body 18 can be changed depending on the size of the coil spring 14 to be used, the mass of the vibration isolator 60, and the like. Therefore, in order to increase the degree of freedom in designing the vibration isolation member 1, it is preferable to select a viscoelastic material having a small Young's modulus E '.

The Young's modulus E ′ of the viscoelastic substance that can be used in the present embodiment is preferably 3 × 10 ⁵ Pa or less, preferably 2 × 10 ⁵ Pa or less, when dynamic viscoelasticity measurement is performed in a compression mode of 1 Hz in an environment at a temperature of 15 ° C. More preferred is 8 × 10 ⁴ Pa or less.

  The viscoelastic material preferably has a large loss coefficient (tan δ). As the loss factor is larger, vibration energy can be converted into thermal energy more effectively, so that the vibration damping performance of the vibration isolation member 1 can be improved. The loss coefficient of the viscoelastic substance is preferably 0.15 or more, preferably 0.2 or more, when measured in a compression mode at a temperature of 20 ° C. and 1 Hz using a dynamic viscoelasticity measuring device. Further preferred.

  As such a viscoelastic substance, an acrylic polymer can be suitably used. Acrylic polymers have low hydrolyzability and do not contain silicone, so there is a low risk of contaminating electronic components and the like. Therefore, the viscoelastic body containing an acrylic polymer is excellent in long-term weather resistance and excellent in chemical resistance and stain resistance.

  The acrylic polymer can be obtained by subjecting a mixture containing an acrylic monomer, a crosslinking agent, and an initiator to a polymerization / crosslinking reaction by a known method. The mixture containing an acrylic monomer or the like can further contain an optional additive, for example, a thickener. The thickener increases the viscosity of the mixture containing the acrylic monomer and facilitates the production of a viscoelastic material sheet having a relatively large thickness.

  As the acrylic monomer, an alkyl (meth) acrylate having an alkyl group having 2 to 20 carbon atoms can be suitably used. This monomer is obtained by adding an alkyl group to an acrylic skeleton. The longer the alkyl group, the lower the elastic modulus and the higher the loss factor of the alkyl group of the acrylic monomer. Therefore, the greater the number of carbon atoms in the alkyl group, the better. Specifically, the carbon number is preferably 8 or more, and more preferably 16 or more.

  The acrylic monomer preferably has a branched structure. This is because an acrylic polymer obtained from an acrylic monomer having a large number of carbon atoms and not having a branched structure generally has a high crystallinity and tends to have a waxy property.

  Examples of the alkyl (meth) acrylate having an alkyl group having 2 to 20 carbon atoms include ethyl (meth) acrylate, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, pentyl, hexyl, heptyl, 2- Examples include ethylhexyl, n-octyl, isooctyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl and the like. “(Meth) acrylate” means “acrylate” or “methacrylate”. In the mixture containing an acrylic monomer or the like, the above alkyl (meth) acrylate may be used alone or in combination.

  A polar group vinyl monomer may be further added to the mixture containing the acrylic monomer and copolymerized with the acrylic monomer. The polar group vinyl monomer has an effect of improving the holding power of the acrylic polymer (difficult to peel off from the adherend). On the other hand, when the amount of the polar group vinyl monomer increases, hydrogen bonds increase inside the polymer, so that the elastic modulus of the acrylic polymer tends to increase. Therefore, the ratio (mass ratio) of the polar group vinyl monomer added to the mixture containing the acrylic monomer and the like is preferably 0.1 or less with respect to the acrylic monomer 1 and polar with respect to the acrylic monomer 1. More preferably, the base vinyl monomer is 0.05 or less.

  Examples of polar group vinyl monomers include carboxy group-containing vinyl monomers such as carboxyalkyl (meth) acrylates such as (meth) acrylic acid, itaconic acid, and crotonic acid: 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl Hydroxyl group-containing vinyl monomers such as (meth) acrylates: Nitrogen-containing vinyl monomers such as acrylamide, acrylonitrile, N-vinylpyrrolidone, N-vinylcaprolactam and the like can be mentioned. The polar group vinyl monomers as described above can be added singly or plural kinds can be added to a mixture containing an acrylic monomer or the like.

  In addition to the above, a crosslinking agent can be added to the mixture containing acrylic monomers and the like. By adding a crosslinking agent to a mixture containing an acrylic monomer or the like, a polymerization reaction and a crosslinking reaction occur simultaneously, and a crosslinked structure can be introduced into the acrylic polymer.

  Although it does not specifically limit as a crosslinking agent, A polyfunctional vinyl compound can be used. Examples of the polyfunctional vinyl compound include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di, 1,9-nonanediol, (poly) ethylene glycol di, (poly) propylene glycol di, Examples thereof include allyl (meth) acrylate, vinyl (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, and urethane (meth) acrylate. These polyfunctional vinyl compounds may be used alone or in combination of two or more.

  Although it does not specifically limit as an initiator contained in the mixture containing an acrylic monomer etc., The photoinitiator which can start a polymerization reaction with an ultraviolet-ray etc. can use it conveniently. Usable photopolymerization initiators include, for example, 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Irgacure 2959, Ciba Specialty Chemicals) 1-hydroxycyclohexyl phenyl ketone (Irgacure 184, Ciba Specialty Chemicals), 2,2-trimethylbenzoyldiphenylphosphine oxide (Irgacure 651, Ciba Specialty Chemicals), and the like.

  In order to obtain an acrylic polymer from a mixture containing acrylic monomers and the like as described above, the polymerization / crosslinking reaction is initiated by irradiating light having a wavelength at which the photopolymerization initiator reacts with the mixture containing acrylic monomers and the like. Good. At this time, a mixture containing an acrylic monomer or the like can be poured into a mold to obtain an acrylic polymer having a desired shape, or a sheet-like acrylic polymer can be sandwiched between two films.

  As the viscoelastic body 18 containing a polymer, a polymer made into a gel can be used. For example, a silicone gel processed into a gel by a known method can be used. The gelled polymer can improve the loss factor of the viscoelastic body and improve the vibration isolation performance.

  As the gel-like viscoelastic substance, an ionic liquid gel obtained by gelling an ionic liquid into an acrylic polymer can be suitably used. This is because this material can be made very soft, that is, a gel material having a low elastic modulus. The ionic liquid gel can contain a very large amount of liquid component and can have a very large loss factor, eg, 0.4 or more at 20 ° C. due to friction of the liquid component.

The ionic liquid gel is characterized by containing an ionic liquid in a polymer structure, so-called polymer network. Here, the “ionic liquid” refers to a substance that exists in a liquid state under normal temperature and normal pressure (25 ° C., 1 atm (1 × 10 ⁵ Pa)) while being an electrolyte composed of an anion and a cation. The “ionic liquid” is generally also called “room temperature molten salt”.

  The ionic liquid contained in the ionic liquid gel is capable of effectively exhibiting vibration absorption performance due to the presence of its own anion and cation ionic bond, etc. Combined properties such as flammability and ion conductivity. The ionic liquid gel of the present embodiment is provided with flexibility by including this ionic liquid. For example, when the ionic liquid gel includes 50% by mass or more of the whole, that is, a large amount of ionic liquid, the characteristics of the flexible gel structure At the same time, the characteristics of the ionic liquid are easily exhibited relatively clearly.

  The polymer (polymer) used in the ionic liquid gel according to the present embodiment contains at least one of an acidic group or a basic group as a structural unit. Examples of the acidic group include a carboxyl group, a hydroxyl group, and a sulfonic acid group. Examples of basic groups include primary, secondary, and tertiary amine groups, primary, secondary, tertiary, and quaternary ammonium groups, amide groups, imidazole groups, and imides. Groups, morpholine groups, piperidyl groups and the like. As a polymer used in the gel composition according to the present embodiment, a homopolymer having at least one selected from vinyl derivatives having acidic groups or basic groups or salts thereof as monomers, Mention may be made of copolymers, tarmers, or polysaccharides such as cellulose, starch, hyaluronic acid, phenol resins, epoxy resins and the like.

  When these polymers having acidic or basic groups are polymerized in the presence of an ionic liquid, the polymer matrix retains the ionic liquid by forming interactions such as hydrogen bonds with the ionic liquid. And easily form a gel state.

  For example, specific examples of the monomer having a carboxyl group as an acidic group include acrylic acid, methacrylic acid, 2-acryloyloxyethyl phthalate, and the like.

  In particular, when polyacrylic acid is used as the polymer, the compatibility with the ionic liquid is good and bleed-out hardly occurs. In addition, interaction such as hydrogen bonding is easily formed with the ionic liquid, and a large amount of ionic liquid is easily retained in the polymer matrix. Accordingly, a gel composition containing a large amount of ionic liquid components can be provided.

  Furthermore, when an acrylic resin such as an acrylic acid homopolymer or copolymer is used as the polymer, the gel composition can be given tackiness. Separately, it is possible to use the gel composition directly by attaching it to a necessary place without requiring an adhesive layer.

  Here, examples of the monomer having a hydroxyl group as an acidic group include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, and the like.

  Examples of the monomer having a sulfonic acid group as an acidic group include 2-acryloyloxyethyl sulfonic acid, 2-methacryloxyethyl sulfonic acid, sodium 2-acryloyloxyethyl sulfonate, and the like.

  Furthermore, examples of monomers having primary, secondary, and tertiary amine groups as basic groups include dimethylaminoethyl acrylate, dimethylaminopropyl acrylate, dimethylaminobutyl acrylate, dimethylaminoethyl methacrylate, and the like. Can be mentioned.

  Examples of monomers having primary, secondary, tertiary and quaternary ammonium groups as basic groups include acryloyloxyethyldimethylammonium fluoride, acryloyloxyethyldimethylammonium chloride, Examples include acryloyloxyethyldimethylammonium bromide and acryloyloxyethyldimethylammonium iodide.

  Furthermore, examples of the monomer having an amide group as a base include dimethylacrylamide, dimethylmethacrylamide, diethylacrylamide, dimethylmethacrylamide and the like.

  Examples of monomers having an imidazole group, an imide group, a morpholine group, or a piperidyl group as a base include vinyl imidazole, imide acrylate, imide methacrylate, acryloylmorpholine, and the like.

  In the ionic liquid gel of the present embodiment, the ionic liquid can be contained in an amount of 50% by mass or more of the entire ionic liquid gel, and can be contained in an amount of 80% or more. By containing a large amount of ionic liquid in this way, flexibility can be imparted to the ionic liquid gel, which can give characteristics such as very low elastic modulus, non-volatility, flame retardancy, and ionic conductivity of the ionic liquid. it can.

  In addition, the ionic liquid gel according to the present embodiment causes friction due to vibration at the bonded portion due to the presence of ionic bonds between cations and anions of the ionic liquid and hydrogen bonds between the polymer structure and the ionic liquid. Because it is easy, it can effectively convert vibration energy to heat energy and exhibit higher vibration absorption performance compared to conventional gel materials such as organogel containing oil in polymers without these structures. .

  Therefore, the vibration absorption ability can be expected to increase as the ratio of the ionic liquid in the gel composition increases. Therefore, the amount of the ionic liquid in the ionic liquid gel is preferably 50% by mass or more, 60% by mass or more, 70% by mass or more, or 80% by mass or more. When it is contained in an amount of 70% by mass or more, it is possible to obtain vibration absorption characteristics equivalent to those of commercially available viscoelastic materials. Further, when it is contained in an amount of about 80% by mass or more, conventional urethane rubber, organogel, silicone gel It is possible to obtain a vibration absorption characteristic higher than that of the vibration absorbing material using the.

  In addition, the higher the ratio of the ionic liquid, the stronger the characteristics of the ionic liquid can be exhibited together with the high vibration absorption ability. For example, depending on the type of ionic liquid used, characteristics derived from the ionic liquid such as non-volatility, ionic conductivity, and flame retardancy are added to the vibration absorbing ability.

  On the other hand, the amount of the ionic liquid in the gel composition only needs to maintain the gel structure, and is preferably 95% by mass or less of the entire gel composition. In addition, if it is 90% by mass or less, it is possible to obtain a more stable structure, but the amount of ionic liquid in the ionic liquid gel is adjusted according to the level of vibration absorption capacity required depending on the application. can do.

There is no limitation in the kind of ionic liquid contained in the ionic liquid gel of embodiment of this invention. The cation is not particularly limited, and a known cation can also be used. Specifically, primary (R ¹ NH ₃ ⁺ ), secondary (R ¹ R ² NH ₂ ⁺ ), tertiary (R ¹ R ² R ³ NH ⁺ ), quaternary (R ¹ R ² R ³ R ⁴ N ⁺ ) chain ammonium cation (wherein R ¹ , R ² , R ³ and R ⁴ are each independently a linear or branched alkyl group having 1 to 15 carbon atoms, or one or more And a straight-chain or branched alkyl group having 1 to 15 carbon atoms or a phenyl group having a hydroxyl group as a side chain) and a cyclic ammonium cation can be used. Examples of the cyclic ammonium cation include oxazolium, thiazolium, imidazolium and the like. Further, as another cation, a chain phosphonium cation (R ⁵ R ⁶ R ⁷ P ⁺ and R ⁵ R ⁶ R ⁷ R ⁸ P ⁺ ), a chain sulfonium cation (R ⁹ R ¹⁰ R ¹¹ S ⁺ ) (in the formula, , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ are each independently a linear or branched alkyl group having 1 to 12 carbon atoms or a phenyl group) and a cyclic sulfonium cation. Is mentioned. Examples of the cyclic sulfonium cation include thiophenium, thiazolinium, and thiopyranium.

  As the anion, inorganic acid ions such as phosphoric acid, sulfuric acid and carboxylic acid, fluorine ions and the like can be used. Various combinations of cations and anions are possible.

Examples of the fluorine-based anion include tetrafluoroborate (BF ₄ ⁻ ), hexafluorophosphate (PF ₆ ⁻ ), hexafluoroarsenate (AsF ₆ ⁻ ), trifluoromethyl sulfonate (CF ₃ SO ₃ ⁻ ), and bis (fluorosulfonyl). ) Imide [(FSO ₂ ) ₂ N ⁻ ], bis (trifluoromethylsulfonyl) imide [(CF ₃ SO ₂ ) ₂ N ⁻ ], bis (trifluoroethylsulfonyl) imide [(CF ₃ CF ₂ SO ₂ ) ₂ N ^-], tris (trifluoromethylsulfonyl _{methide) [(CF 3 SO 2)} 3 C -] can be exemplified.

It is desirable to use a non-halogen-based anion. In particular, if a phosphate ion is used, it is cheaper and more economical than a fluorine ion, and high flame retardancy can be obtained. . For example, the general formula [PO ₄ ³⁻ ], [RPO ₄ ²⁻ ] or [RR′PO ₄ ⁻ ] containing the following phosphate group as a phosphate anion (wherein R and R ′ are hydrogen, carbon number 1-8 linear or branched alkyl groups or phenyl groups) can be used. Specifically, phosphoric acid (PO ₄ ³⁻ , HPO ₄ ²⁻ , H ₂ PO ₄ ⁻ ), phosphoric acid monoester (RPO ₄ ²⁻ , HRPO ₄ ⁻ ), phosphoric acid diester (R ² PO ₄ ⁻ ) [R is a linear or branched alkyl group or phenyl group having 1 to 8 carbon atoms].

  As described above, in the ionic liquid gel of the present embodiment, flame retardancy can be obtained when the flame retardant ionic liquid is used. The term “flame retardancy” as used herein refers to, for example, US Underwriters Laboratories Inc. According to the safety standard UL-94 flame retardant test method defined by (UL), not only when it corresponds to V-1 or higher, or more preferably V-0 or higher, but also by the A method specified in JISK6911 When digestibility is observed, or after a flame such as a burner is in contact with a flame for a certain period of time, the flame disappears within a few seconds to several tens of seconds when the burner is released.

  Next, the manufacturing method of the ionic liquid gel of this Embodiment is demonstrated. In the ionic liquid gel of the present embodiment, the ionic liquid is mixed with the monomer or polymer and, if necessary, the crosslinking agent, and then the monomer is polymerized and crosslinked by ultraviolet irradiation (UV) irradiation or heating, or the polymer is crosslinked. Can be produced.

  A commercially available ionic liquid can be used, but it can also be synthesized using methods such as an acid ester method, a complex formation method, and a neutralization method. Further, not only one type but also a plurality of types can be mixed and used.

  For example, when synthesizing a phosphate-based ionic liquid using a neutralization method, an amine is added to an inorganic / organic phosphoric acid such as phosphoric acid or dibutyl phosphate diluted 5-fold with an organic solvent such as alcohol under low temperature conditions. For example, the solution is dropped at 0 ° C. and sufficiently stirred at room temperature. Thereafter, it is distilled under reduced pressure to evaporate the solvent.

  Next, the obtained ionic liquid, one kind or two or more kinds of monomers and, if necessary, a crosslinking agent are added and mixed. As the monomer, a monomer containing at least one acidic group selected from the group consisting of a carboxyl group, a hydroxyl group and a sulfonic acid group as a constituent unit, or primary, secondary, and tertiary amine groups At least one acidic group selected from the group consisting of primary, secondary, tertiary, and quaternary ammonium groups, amide groups, imidazole groups, imide groups, morpholine groups, and piperidyl groups; A monomer or the like included as a structural unit can be used. A monomer is not restricted to 1 type, You may use 2 or more types.

  For example, when using an acrylic acid monomer that is a monomer containing a carboxyl group, acrylic acid, ammonium acrylate, sodium acrylate, lithium acrylate, methacrylic acid, ammonium methacrylate, sodium methacrylate, lithium methacrylate, etc. Monomers can be used.

  As for the mixing ratio of the ionic liquid and the monomer, for example, 100 parts by mass or more of the ionic liquid is added to 100 parts by mass of the monomer so that 50% by mass or more of the finally obtained gel composition becomes the ionic liquid.

  A polymer can also be used in place of the monomer. It is also possible to use both monomers and polymers or a plurality of types of monomers and polymers. In any case, 100 parts by mass or more of the ionic liquid is added to 100 parts by mass of the total of the polymer or the monomer and the polymer.

  The crosslinking agent is added in an amount of about 0.1 to 10 parts by weight, or 0.1 to 50 parts by weight with respect to 100 parts by weight of the monomer or the polymer or the monomer and the polymer.

  Moreover, when using an acrylic acid monomer, as a crosslinking agent, for example, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, ECH-modified 1,6-hexanediol diacrylate, etc. should be used. Can do.

  As the polymerization means, any polymerization means of heat or radiation may be used. As radiation, in particular, when ultraviolet rays (UV) having a wavelength of 200 nm to 400 nm are used, controllability is good and polymerization and curing can be performed at room temperature, so that a gel composition is directly formed even on a substrate having a relatively low melting point. it can. In addition, when performing UV polymerization, a photoinitiator is added. For example, the photopolymerization initiator is added in an amount of about 0.01 to 1 part by mass with respect to 100 parts by mass of the monomer.

  Examples of the photopolymerization initiator include 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Irgacure 2959, Ciba Specialty Chemicals), 1- Hydroxycyclohexyl phenyl ketone (Irgacure 184, Ciba Specialty Chemicals), 2,2-trimethylbenzoyldiphenylphosphine oxide (Irgacure 651, Ciba Specialty Chemicals) and the like can be mentioned.

  Various additives can be further added according to the use of the vibration absorbing material. For example, a filler as a heat dissipating material or an electromagnetic wave absorbing material can be added. If the gel composition itself is almost transparent, it can also be colored by adding pigments and dyes. Further, if necessary, a tackifier, a surface lubricant, a leveling agent, an antioxidant, a corrosion inhibitor and the like can be added.

  In the polymerization, necessary processing can be performed according to the intended use. There is no limitation on its shape. For example, the sheet may have a thickness of several mm to several tens of mm, or may be a film having a thickness of several mm or less. Or when bonding and using to a member, it can also shape | mold according to the member shape to bond.

  In the case of processing into a sheet or film, for example, a mixed solution in which the ionic liquid, the monomer, the crosslinking agent, and the photopolymerizer are mixed is poured into a frame mold having good releasability, such as silicone rubber. A transparent resin film that has been peeled off is laminated. Thereafter, the mixed solution is polymerized by irradiating with ultraviolet rays (UV) through a transparent resin film. After the polymerization, a sheet-like gel composition can be obtained by peeling the mold and the resin film.

  In addition, it coats the said liquid mixture on the resin film which carried out the peeling process, Furthermore, it laminates with the resin film which carried out the peeling process on it, and irradiates an ultraviolet-ray (UV) through any resin film, and a liquid mixture May be polymerized. After the polymerization, the film-like gel composition can be obtained by peeling both films. Or it can also be used as a vibration-absorbing material with the gel composition sandwiched between two resin films. Moreover, it is good also as a structure which sealed the edge part of two resin films and sealed the gel-like composition.

  Only one of the two resin films may be peeled off, and the user may peel off one of the films at the time of use, and affix the peeled gel-like composition surface to a place where the vibration absorber is to be used. When acrylic acid homopolymer or copolymer is used as the polymer of the gel-like composition, the gel-like composition itself has an adhesive force, so that it can be used by directly sticking to a required place. Although there is no restriction | limiting in particular in the resin film to be used, If it is a film provided with the flexibility, it is desirable. For example, polyethylene, polypropylene, vinyl chloride, polycarbonate, thermoplastic polyurethane, cellophane (registered trademark), vinylidene fluoride, polyethylene terephthalate (PET), polystyrene and vinyl chloride acrylic, polyurethane, polyolefin, fluorine resin (PVdF, ETFE, etc.) ), Resin films of polyimide, phenol resin, epoxy resin, polyamide, polyphenylene ether and the like.

  The vibration isolation member 1 as described above can be manufactured as follows. First, the coil spring 14 having an appropriate spring constant is selected from the frequency of vibration generated at the place where the vibration isolation object 60 is installed, the mass of the vibration isolation object supported by one vibration isolation member, and the like. .

  From the mass, the length of the coil spring 14 when the vibration isolation member 1 supports the vibration isolation object is obtained experimentally or by calculation, and the height H of the absorbent material accommodating portion 16 is obtained. A viscoelastic body 18 having substantially the same height as the height H of the absorbent material accommodating portion 16 is prepared by an arbitrary method.

  The vibration isolation member 1 having the structure shown in FIG. 1 is assembled. For example, the lower support member 10 is prepared, and the coil spring 14 and the viscoelastic body 18 are disposed thereon. The upper support member 12 is disposed on the coil spring 14. The coil spring 14 and the upper and lower support members 12 and 10 can be fixed by any method.

The vibration isolation member 1 according to an embodiment of the present invention can be variously modified in addition to the above-described embodiment. Hereinafter, other embodiments will be described.
3 and 4 show a vibration isolation member 101 according to the second embodiment of the present invention. The vibration isolation member 101 of the present embodiment is different from that of the first embodiment in that the upper support member 1200 includes an adjustment member 120 that adjusts the height H ′ (that is, H) of the absorbent material accommodation portion 16.

  The vibration isolation member 101 of the second embodiment includes an adjustment member 120 that is engaged with the upper support member base 112 of the upper support member 1200. The adjustment member 120 includes a shaft portion 122 and a support portion 124 provided at one end of the shaft portion 122. The absorbent material accommodation portion 16 is disposed between the lower surface 124 a of the support portion 124 and the upper surface 10 b of the lower support member 10.

  The shaft part 122 is a cylindrical part and has a thread on the surface 122a. The upper support member base 112 also has a hole 113 corresponding to the outer diameter of the shaft portion 122, and has a thread on its inner surface 113a. The shaft portion 122 and the hole portion 113 are screwed together by a screw thread on each surface. Therefore, by rotating the adjustment member 120 relative to the upper support member 112, the position of the adjustment member 120 with respect to the upper support member 112, that is, the height H of the absorbent material accommodating portion 16 can be adjusted.

  The support part 124 is a part in contact with the viscoelastic body 18 and has a disk shape in the illustrated embodiment. When the vibration isolation member 101 supports the vibration isolation object 60, the coil spring 14 is compressed, and the support portion 124 approaches the viscoelastic body 18. The adjustment member 120 is arranged in advance at a position closest to the upper support member base 112, and a gap is generated between the lower surface 124a of the support portion 124 and the viscoelastic body 18 when the vibration isolation portion 60 is supported. Next, the adjusting member 120 is rotated to approach the viscoelastic body 18, and the adjusting member 120 can be fixed at a position where the lower surface 124 a contacts the viscoelastic body 18.

  In the case where the mass of the vibration isolator 60 is not known in advance, it is difficult to determine the height H of the absorbent material accommodating portion 16 and the height A of the viscoelastic body in advance. In that case, if it has the adjustment member 120 like this embodiment, the height H of the absorber accommodating part 16 can be adjusted according to the mass of the to-be-vibrated object 60. FIG.

The means for engaging the adjustment member 120 and the upper support member base 112 is not limited to screws, and various known means can be used. Further, the adjustment member 120 and the upper support member base 112 may be fixed with a known fixing element such as a pin or a nut, an adhesive, or the like so that the position of the adjustment member 120 does not change during vibration isolation. Alternatively, a thin plate as an adjustment member is inserted between the viscoelastic body 18 and the upper support member base 112, and the height H of the absorbent material accommodation portion 16 when the vibration isolator 60 is supported and the viscosity in the natural state. You may adjust so that the height A of the elastic body 18 may become substantially equal.
Next, a vibration isolation member according to a third embodiment of the present invention will be described. FIG. 5 shows a cross-sectional view of the vibration isolation member 201. The vibration isolation member 201 includes an intermediate layer 20 that can suppress adhesion between the upper support member 12 and the viscoelastic body 18. Other than that, the same structure and materials as those of the first or second embodiment described above can be used. FIG. 5 shows an example in which the structure of the first embodiment is used except for the intermediate layer 20.

  As the viscoelastic body 18 used in the first and second embodiments of the present invention, typically, a viscoelastic substance exhibiting adhesiveness can be used, such as an ionic liquid gel. The use of the viscoelastic body 18 having a sticky structure is easy to fix to the lower support member 12 or when the viscoelastic body 18 is formed by stacking a plurality of viscoelastic materials processed into a sheet shape. There is an advantage that can be easily integrated. However, on the other hand, when vibration is applied in a state in which the vibration isolation member is placed on the vibration isolation member 1, the viscoelastic body 18 substantially does not compress but the vertical contraction movement of the coil spring 14 is performed. Thus, when the coil spring 14 is contracted, the upper surface 18b of the viscoelastic body 18 contacts the upper support 12 and the viscoelastic body 18 may stick to the upper support member 12 due to its adhesiveness. Once the viscoelastic body 18 adheres to the upper support member 12, the viscoelastic body 18 vibrates with the coil spring 14, and the substantial spring constant K of the coil spring 14 is the original spring constant (Kc) of the coil. ) And the spring constant (Kv) of the viscoelastic body. Since the spring constant K increases, the natural frequency increases and the resonance frequency cannot be kept low.

A vibration isolation member 201 according to the third embodiment shown in FIG. 5 includes an intermediate layer 20 that can suppress adhesion between the upper support member 12 and the viscoelastic body 18 between the upper support member 12 and the viscoelastic body 18. . Since the viscoelastic body 18 can be prevented from sticking to the upper support member 12 due to the presence of the intermediate layer 20, the original vibration isolation performance of the coil spring 14 can be prevented from being hindered by the sticking of the viscoelastic body 18. As a result, the substantial spring constant K of the coil spring 14 can maintain the original spring constant (Kc) of the coil spring, and the resonance frequency can be kept low. The response acceleration of the supporting member can be reduced, and a good vibration isolation effect can be exhibited.
The arrangement of the intermediate layer 20 is not particularly limited as long as it is between the upper support member 12 and the viscoelastic body 18. For example, as shown in FIG. It can arrange | position so that the upper surface 18b of the viscoelastic body 18 which opposes may be covered. Also in this case, the intermediate layer 20 does not need to cover the entire upper surface 18b of the viscoelastic body 18, and is disposed so as to cover at least partly, thereby allowing the viscoelastic body 18 and the upper support member 12 to adhere to each other. If it can suppress.

The intermediate layer 20 can be used as long as it can suppress the adhesion between the viscoelastic body 18 and the upper support member 12, and the material is not limited, but may be a material that does not hinder the original movement of the viscoelastic body 18. desirable. For example, various materials such as a non-adhesive resin film layer, a resin coating layer, a metal foil, a metal or oxide film coating layer, a resin or inorganic fine particles, and a metal foil can be used. If these materials are placed on the upper surface 18 b of the viscoelastic body 18 facing the upper support member 12, the material can be fixed by the adhesive property of the viscoelastic body 18 itself and on the upper surface 18 b of the viscoelastic body 18. A non-adhesive surface can be formed, and adhesion with the upper support member 12 can be suppressed.
When a resin film layer is used as the intermediate layer 20, it can be easily attached to the vibration isolation member 201. Although there is no restriction | limiting in particular as a resin film to be used, It is preferable to use the resin film provided with the flexibility which can follow the deformation | transformation of the viscoelastic body 18 in use. For example, such resin films include polyethylene, polypropylene, vinyl chloride, ethylene vinyl acetate, thermoplastic polyurethane, cellophane (registered trademark), vinylidene fluoride, polyethylene terephthalate (PET), polystyrene and vinyl chloride acrylic, polyurethane, Examples thereof include resin films such as polyolefins, fluorine resins (PVdF, ETFE, etc.), polyimides, phenol resins, epoxy resins, polyamides, and polyphenylene ethers.

Although there is no limitation on the thickness of the resin film to be used, it is preferable to use a thickness of 500 μm or less, 300 μm or less, or 100 μm or less depending on the type of material so as to easily follow the movement of the viscoelastic body 18. On the other hand, it is desirable that the thickness be 10 μm or more, or 50 μm or more in order to have durability to withstand repeated impacts applied during vibration. These films may be perforated films or mesh films having openings.
When the intermediate layer 20 is a layer in which inorganic or organic fine particles are dispersed and adhered onto the upper surface 18b of the viscoelastic body, the inorganic fine particles include silicon oxide (SiO ₂ ), titanium oxide (TiO ₂ ), and the like. As the organic fine particles, for example, plastic fine particles such as polypropylene and polyethylene can be used.

  The intermediate layer 20 does not necessarily need to be separate from the viscoelastic body 18 and the upper support member 12. The intermediate layer 20 may be connected to the upper surface 18 b of the viscoelastic body 18 or the viscoelastic body of the upper support member 12. The intermediate layer 20 may be formed by subjecting the opposing surface to physical or chemical processing, and adhesion between the two may be suppressed. For example, the upper surface 18b of the viscoelastic body 18 is subjected to surface modification that increases the degree of cross-linking of the resin by heat treatment, plasma treatment, ultraviolet irradiation treatment, or the like, so that the surface layer, that is, the intermediate layer 20 in which the adhesiveness is reduced or eliminated. May be formed.

  FIG. 5 shows an example in which the upper support member 12 of the first embodiment is used as the vibration isolation member 201 of the third embodiment, but the upper support member 1200 of the second embodiment is used. In this case, the same effect can be obtained by providing the intermediate layer 20 between the upper surface 18b of the viscoelastic body and the bottom surface of the adjusting member 121 corresponding to the surface of the upper support member facing the viscoelastic body.

In FIG. 5, the intermediate layer 20 is formed on the upper surface 18b of the viscoelastic body 18. However, the arrangement of the intermediate layer 20 is not necessarily formed or fixed on the upper surface 18b. And between the opposing surfaces of the viscoelastic body 18. For example, the intermediate layer 20 may be provided on the bottom surface 12 a side of the upper support member 12. Alternatively, the intermediate layer 20 may be provided on each of the bottom surface 12a and the viscoelastic surface 18b of the upper support member 12.
As mentioned above, although embodiment of this invention was described, the structure, material, etc. of the vibration isolator of this invention are not limited to description of the 1st-3rd embodiment mentioned above, A various deformation | transformation and combination Needless to say, this is possible.

1. -1 Preparation of viscoelastic composition <Example 1>
94 parts by weight of C16 isopalmityl acrylate (HEDA16 manufactured by Toho Chemical Co., Ltd.), 6 parts by weight of polyisobutylene (OPanol B100 manufactured by BASF), 1,6-hexanediol diacrylate (Light acrylate 1,6HX- manufactured by Kyoei Chemical Co., Ltd.) A) A shaft equipped with propeller-type four blades in which 0.1 part by weight and 0.3 part by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (Ciba Specialty Chemicals Darocur TPO) are placed in a beaker. Were mixed for 30 minutes using a lab stirrer (LR-51B, manufactured by Yamato Kagaku Co., Ltd.). The mixed solution was sandwiched between two different PET films peeled with silicone (A50 50 μm thickness manufactured by Teijin DuPont Films Co., Ltd. and therapy MIB (T) 50 μm thickness manufactured by Toray Industries, Inc.). That is, a PMMA frame was placed on one PET film, the mixed solution was poured into the frame, and then the other PET film was covered. The mixed solution was irradiated with ultraviolet rays having a cumulative amount of 3000 mJ / cm ² with a fluorescent black light bulb (F20T12B manufactured by Sylvania) having a maximum emission spectrum at a light wavelength of 300-400 nm and 351 nm through a PET film, and a thickness of about 1.3 mm. A sheet-like viscoelastic composition was obtained. The sheet-like viscoelastic composition was cut into a circle and four sheets were laminated to obtain a viscoelastic composition having the shape shown in Table 1. In addition, the dimension was measured with the dial thickness gauge (made by Mitutoyo Corporation).

<Example 2>
100 parts by weight of 2-ethylhexyl acrylate (AEH manufactured by Nippon Shokubai Co., Ltd.) and 0.04 parts by weight of 2,2-dimethoxy-2-phenylacetophenone (Irgacure 651 manufactured by CIBA specialty chemicals) were placed in a flask, and 10 labs with the above lab stirrer. Stir for minutes to obtain a homogeneous solution. While stirring the obtained solution, bubbling with nitrogen gas was performed for 10 minutes, and an ultraviolet ray with an integrated amount of 90 mJ / cm ² was irradiated with the fluorescent black light bulb to prepare a polymerizable prepolymer syrup having a reaction rate of 10% and a viscosity of 1000 cps. .

  100 parts by weight of the polymerizable prepolymer syrup, 0.1 part by weight of 1,6-hexanediol diacrylate (HDDA) (NK Nakano Chemical Co., Ltd., NK ester A-HD), 2,2-dimethoxy- 0.16 part by weight of 2-phenylacetophenone was added and the mixture was further stirred for 30 minutes to make a uniform solution.

The obtained solution was sandwiched between two pieces of silicone-exfoliated PET (A71 manufactured by Teijin DuPont Films, 50 μm thick), and irradiated with ultraviolet light having a cumulative amount of 1500 mJ / cm ^{2 with} the fluorescent black light bulb. A 2 mm sheet-like viscoelastic composition was obtained. The sheet-like viscoelastic composition was cut out into a circle, and three sheets were laminated to obtain a viscoelastic composition having the shape shown in Table 1.

<Example 3>
Monoethyl / diethyl phosphate triethylammonium equimolar mixture (TrEA-EtHPO ₄ / Et ₂ PO ₄ ) Triethylamine (TrEA) (manufactured by Daicel Chemical Industries, Ltd.) in 100 parts by mass, methanol (MeOH) (special grade, Wako Pure Chemical Industries, Ltd.) 50 parts by mass), and further, a solution (EtH ₂ PO ₄ / Et ₂ HPO ₄ ) (JP-502, Johoku Chemical) in which monoethyl phosphate and diethyl phosphate are mixed at a molar ratio of 50:50 under ice cooling. 139 parts by mass of Kogyo Co., Ltd. was slowly added dropwise. After stirring at room temperature for 3 hours, distillation was performed under reduced pressure to obtain TrEA-EtHPO ₄ / Et ₂ PO ₄ which is a colorless and transparent viscous liquid.

80 parts by weight of TrEA-EtHPO ₄ / Et ₂ PO ₄ obtained by the above process, 20 parts by weight of acrylic acid (special grade reagent, manufactured by Wako Pure Chemical Industries, Ltd.), 2-hydroxy-2-methyl-1-phenyl-propane 0.04 part by weight of -1-one (manufactured by CIBA specialty chemicals, Darcur 1173) was placed in a flask and stirred for 10 minutes with the lab stirrer to obtain a uniform solution. While stirring the obtained solution, bubbling with nitrogen gas was performed for 10 minutes, and an ultraviolet ray with an integrated amount of 90 mJ / cm ² was irradiated with the fluorescent black light bulb to prepare a polymerizable prepolymer syrup having a reaction rate of 10% and a viscosity of 1000 cps. .

  To 100 parts by weight of the resulting polymerizable prepolymer syrup, 0.06 part by weight of 1,6-hexanediol diacrylate (HDDA) (Kyoei Chemical Co., Ltd. Light Acrylate 1,6HX-A) and 0.08 part by weight of Darcur 1173 The mixture was further stirred for 30 minutes to obtain a uniform solution.

The solution was degassed in vacuum, and then sandwiched between two peeled PET (A31 38 μm thickness, manufactured by Teijin DuPont Films), and irradiated with ultraviolet light with a cumulative amount of 1500 mJ / cm ^{2 with} the fluorescent black bulb, and a thickness of about 1 A sheet-like viscoelastic composition of 2 mm was obtained. The sheet-like viscoelastic composition was cut out into a circle, and three sheets were laminated to obtain a viscoelastic composition having the shape shown in Table 1.

1-2. Measurement of Young's modulus of viscoelastic composition For the viscoelastic composition prepared in Examples 1 to 3, Young's modulus E 'in compression mode was measured using RSAIII manufactured by TA Instruments. However, the ambient temperature of the sample was set to 20 ° C., and the measurement frequency was 1 Hz. Table 1 shows the measured Young's modulus E ′ and the spring constant obtained by calculation.

1-3. Preparation of vibration isolation member and measurement of vibration isolation performance <Example 4>
In the same manner as in Example 1, a sheet-like viscoelastic composition was prepared. However, the thickness of the obtained sheet-like viscoelastic composition was about 1.2 mm, and it was cut into a circle having a diameter of about 23 mm. Thirteen viscoelastic compositions cut into a circle were stacked to obtain a cylindrical viscoelastic body. Each layer of the viscoelastic composition was integrated by its own adhesiveness. The height in the natural state of the obtained viscoelastic body was 15.6 mm.

  The obtained viscoelastic body and a coil spring (diameter 30 mm, free length 30 mm, spring constant of about 1.68 N / m) were arranged between two spring seats (diameter 30 mm) to produce a vibration isolation member. . The surface of the spring seat that contacts the viscoelastic body has a difference of 3.2 mm from the surface that the end surface of the coil spring contacts, and the height of the absorber housing portion is 6.4 mm longer than the length of the spring. It is configured to be shorter.

  The frequency characteristics of the manufactured vibration isolation member were measured. A load of 6 kgf was applied to the vibration isolation member so that the height of the viscoelastic body in the natural state and the height of the absorbent material accommodating portion were substantially the same. The vibrations of both the vibration exciter and the upper support of the vibration isolation member were measured, and the ratio of the vibration output to the vibration input was determined as the response magnification. The length of the single coil spring when compressed with 6 kgf was about 22 mm. As in the waveform of the vibration isolation member of Example 4 shown in FIG. 5, a waveform having a maximum response magnification (resonance magnification) on the low frequency side was observed in any sample. From the obtained measurement results, the peak width at which the response magnification is 70% of the maximum value and the center (resonance frequency) of the peak width were obtained by calculation. The results are shown in Table 2.

Exciter: IMV m060MA1
Accelerometer: Ono Sokki NP-3211
Accelerometer: Ono Sokki DS-2000 FFT analyzer Environmental temperature: 25 ° C
Excitation conditions: Acceleration 0.5G (frequency 5-500Hz)
Excitation direction: Z direction (direction in which the coil spring is compressed and expanded)

<Example 5 to Example 7>
Using the vibration isolation member produced in Example 4, insert 1 to 3 shims (spacers) having a diameter of 30 mm and a thickness of 1.6 mm between the viscoelastic body and the upper support member to Measurement was performed in the same manner as in Example 4 while changing the height. The results are shown in Table 2.

2-1. Preparation of viscoelastic composition <Example 8>
An acrylic monomer mixed solution prepared under the same composition conditions as in Example 1 was prepared. A PMMA frame is placed on a PET film (A71 manufactured by Teijin DuPont Films, Inc., 38 μm thick) peeled with silicone, and the mixed solution is poured into the frame. Therapeutic MIB (T), 38 μm thick). Furthermore, a transparent PMMA plate (acrylic plate cast ACA HM manufactured by Misumi Co., Ltd.) with a thickness of 1 mm is placed on the PET film, and maximum light emission occurs at light wavelengths of 300 to 400 nm and 351 nm through the PMMA plate and the PET film. An accumulated amount of 4400 mJ / cm ² of ultraviolet light was irradiated with a fluorescent black light bulb having a spectrum (F20T12B manufactured by Sylvania) to obtain a sheet-like viscoelastic composition having a thickness of about 4 mm.

2-2. Measurement of Young's Modulus of Viscoelastic Composition For the viscoelastic composition prepared in Example 8, Young's modulus E ′ in the compression mode was measured using RSAIII manufactured by TA Instruments. However, the ambient temperature of the sample was set to 20 ° C., and the measurement frequency was 1 Hz. Table 3 shows the measured Young's modulus E ′ and the spring constant obtained by calculation.

2-3. Preparation of vibration isolation member <Example-9>
The sheet-like viscoelastic composition obtained in Example 8 was cut into a circle having a diameter of 23 mm, and four sheets were laminated to obtain a columnar viscoelastic body having a thickness of 16 mm. A 30 μm-thick ethylene vinyl acetate copolymer (EVA) film (EVA35 / PET50 FILM manufactured by Seadom Co., Ltd.) was attached to the side surface and the upper surface of the cylindrical viscoelastic body. Thus, the upper surface and the side surface of the viscoelastic body were brought into a non-sticky state.
A coil spring (diameter: 30 mm, free length: 30 mm, spring constant: about 0.93 N / m) is disposed around the outer periphery of the cylindrical viscoelastic body to which the EVA film is attached, and these are used as an upper support member and a lower support member. It was installed between two spring seats (diameter 30 mm) to produce a vibration isolation member. The surface of one spring seat facing the upper surface of the viscoelastic body has a difference of 3.5 mm from the surface with which the end surface of the coil spring contacts, and the height of the absorber housing portion is 7 mm longer than the length of the spring. It is configured to be shortened by 0.0 mm.

<Example-10>
For comparison with Example 9, the sheet-like viscoelastic composition obtained in Example 8 was cut into a circle with a diameter of 23 mm, and four sheets were laminated to prepare a columnar viscoelastic body with a thickness of 16 mm. Only 30 μm-thick ethylene vinyl acetate copolymer (EVA) film (EVA35 / PET50 FILM manufactured by Seadam Co., Ltd.) was attached thereto. This was placed inside the same coil spring as in Example-9, and both were placed between two spring seats (diameter 30 mm) to produce a vibration isolation member. The upper surface of the viscoelastic body to which EVA is not attached is in a state where the sticky viscoelastic body is exposed.
The surface of the spring seat that contacts the viscoelastic body has a gap of 3.5 mm from the surface that the end surface of the coil spring contacts, and the height of the absorber housing is 7.0 mm shorter than the length of the spring. It is configured as follows.

2-4. Measurement of vibration isolation performance The frequency of response acceleration of the vibration isolation member using only the same coil spring as that of the two vibration isolation members manufactured in Example-9 and Example-10 and the comparative example Dependency was measured. A load of 5 kgf was applied to the vibration isolation member so that the height of the viscoelastic body due to the natural state and the height of the absorbent material accommodating portion were substantially the same. Under the following conditions, a predetermined vibration was applied to the vibration isolation member using a vibration exciter, and a response acceleration generated in a 5 kgf supported body supported on each vibration isolation member was measured. The length of the coil spring alone when compressed with 5 kgf was about 13 mm. Further, when only the coil spring is used, the low frequency region where the response acceleration exceeds the measurement limit of the measuring device is not measured.

Exciter: IMV m060MA1
Accelerometer: Ono Sokki NP-3211
Accelerometer: DS-2000 FFT analyzer manufactured by Ono Sokki Environmental temperature: 20 ° C
Measurement frequency: 5-500Hz
Excitation conditions: acceleration single amplitude: 0.5G, acceleration double amplitude: 1G
Excitation direction: Z direction (direction in which the coil spring is compressed and expanded)
The results are shown in FIG. In each of the vibration isolation members of Example-9 and Example-10, the maximum value of the response acceleration, that is, a waveform having a resonance frequency is observed on the low frequency side of 10 Hz or less, and the resonance is higher than when only the coil spring is used. Response acceleration in frequency was greatly reduced. Furthermore, compared with the vibration isolation member of Example-10, in the vibration isolation member of Example-9 in which an EVA film is attached to the upper surface of the viscoelastic body to prevent sticking to the spring seat, the resonance frequency is lower. The response acceleration at the resonance frequency could be further reduced.

DESCRIPTION OF SYMBOLS 1,101 Anti-vibration member 10 Lower support member 12, 1200 Upper support member 14 Coil spring 16 Absorber accommodating part 18 Viscoelastic body 20 Intermediate layer 40 Floor 60 Damped object 120 Adjustment member

Claims (5)

A vibration isolation member for vibration isolation while supporting a vibration isolation object,
An upper support;
A lower support that is spaced apart from the upper support;
A coil spring disposed at both ends in contact with the upper support and the lower support;
An absorbent material accommodating portion provided between the upper support and the lower support;
A viscoelastic body disposed in the absorbent material accommodating portion,
Before supporting the vibration isolator, the absorbent container has a space above the upper end of the viscoelastic body,
The height of the natural state of the viscoelastic body, wherein are set such that the coil spring to support the the dividend Fubutsu is substantially the height of the absorbing material container when deflated the same, the vibration isolation member .   The natural height of the viscoelastic body is less than 110% of the height of the absorbent housing portion when the vibration isolator is supported, and the vibration isolator supports the vibration isolator. The vibration isolation member according to claim 1, wherein the vibration isolation member is larger than a minimum height of the absorbent material accommodating portion therein. 3. The vibration isolation member according to claim 1, wherein Young's modulus E ′ of the viscoelastic body is 3 × 10 ⁵ Pa or less when measured in a compression mode of 1 Hz in an environment of 20 ° C. 4.   The vibration isolator according to any one of claims 1 to 3, wherein the viscoelastic body includes an acrylic polymer or an ionic liquid gel. A method for manufacturing a vibration isolation member according to any one of claims 1 to 4,
A step of obtaining a height of the absorbent housing portion in a state of supporting the vibration isolator,
Preparing the viscoelastic body having a height substantially equal to the height of the absorbent material accommodating portion in a state in which the vibration isolator is supported;
A step of disposing the viscoelastic body in the absorbent material accommodating portion and assembling the compression coil spring to the lower support member and the upper support member so as to be in contact with both ends of the compression coil spring;
The manufacturing method of the vibration isolating member containing this.