JP2003176416A - Vibration-damping composite material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a vibration-damping composite material usable in wide applications and having a combination of high mechanical strengths with good vibration-damping properties. <P>SOLUTION: This composite material comprises a matrix polymer and a fibrous reinforcing material incorporated in the matrix polymer, wherein the matrix polymer is also incorporated with an organic vibration-damping agent. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping and sound absorbing material for ceilings, floors, sidewalls, bonnets, etc. in transportation machines such as automobiles, trains, ships, and aircraft, and also for construction, civil engineering, and agriculture. Etc. as a noise countermeasure material for various industrial machines or noise sources such as factory ducts and processing machines, as a vibration control and sound absorbing material for ceilings, floors and side walls of houses, buildings, factories, etc. It can be used for a wide range of purposes such as household appliances such as vacuum cleaners, audio equipment such as stereos and video players, precision equipment such as video cameras, electronic equipment such as computers and printers, and other sports equipment and daily necessities. The present invention relates to a vibration damping composite material having excellent vibration damping properties.

[0002]

2. Description of the Related Art Conventionally, fiber-reinforced plastic composite materials (FRP) have been widely used in transportation machines, precision instruments, industrial machines, civil engineering buildings and the like. .

Among the applications in which these FRPs are used, for example, in the engine portion of automobiles and ships, the function of suppressing the propagation of vibration to the outside is required.

Further, among the applications in which the FRP is used, the motor portion of a computer, a video camera or the like is required to have a function of protecting the motor portion from vibration propagating from the outside.

When the FRP is used for such purposes, measures against vibration have been taken such as sticking a rubber sheet on the inside of the FRP. Furthermore, recently, a vibration-damping FRP in which a thermosetting plastic such as unsaturated polyester is used as a matrix polymer and an inorganic filler such as ferrite is filled therein has been proposed.

However, an FRP with a rubber sheet attached
In addition to the complicated adhesion work, there was a problem that the FRP and the rubber sheet were peeled off depending on the condition of use. On the other hand, with respect to the vibration damping FRP filled with ferrite or the like, there is a problem that the vibration damping FRP has a low vibration damping property and a sufficient vibration countermeasure cannot be taken.

Therefore, as a further improved vibration damping FRP, it has been proposed to add a rubber material to the vibration damping FRP to improve the vibration damping performance.

However, in this vibration damping FRP, although high vibration damping is obtained by compounding the rubber material,
On the other hand, the strength of FRP (flexural elasticity) depends on the combination of rubber materials
However, there was a problem in that

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a vibration-damping composite material having both high strength and excellent vibration-damping property, which can be used in a wide variety of applications. It is intended.

[0010]

In order to achieve the above object, the invention according to claim 1 comprises a matrix polymer,
A vibration-damping composite material having a fiber reinforcing material contained in the matrix polymer, wherein a vibration-damping composite material characterized in that an organic vibration damping agent is blended in the matrix polymer.

According to a second aspect of the present invention, the matrix polymer is unsaturated polyester, epoxy, phenol,
Either melamine, urethane or silicon resin, or mixtures thereof, polyvinyl chloride, polyvinyl acetate,
The vibration damping composite material according to claim 1, which is one of polyamide and acrylic acid ester, or a mixture thereof.

According to the third aspect of the invention, the fiber reinforcement is carbon fiber, glass fiber, aramid fiber, boron fiber,
The vibration-damping composite material according to claim 1 is composed of one kind or two or more kinds selected from alumina fibers, silicon carbide fibers, and metal fibers.

The invention according to claim 4 is characterized in that the fiber reinforcing material is contained in an amount of 10 to 500 parts by weight with respect to 100 parts by weight of the matrix polymer. The material was used as the gist.

In the invention of claim 5, the organic vibration damping agent is selected from compounds having a benzothiazyl group, compounds having a benzotriazole group, compounds having a diphenylacrylate group, and compounds having a benzophenone group. The vibration-damping composite material according to claim 1, which is one kind or a mixture of two or more kinds.

According to a sixth aspect of the present invention, the organic vibration damping agent is contained in an amount of 1 to 10 per 100 parts by weight of the matrix polymer.
The vibration damping composite material according to claim 5, characterized in that it is blended in a proportion of 0 parts by weight.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The vibration-damping composite material of the present invention will be described in more detail below. As the matrix polymer constituting the vibration-damping composite material of the present invention, a thermosetting plastic or a thermoplastic resin can be used depending on the application and use condition of the vibration-damping composite material.

Examples of thermosetting plastics include unsaturated polyester, epoxy, phenol, melamine,
Either urethane or silicon resin, or a mixture thereof is preferable, and as the thermoplastic,
For example, polyvinyl chloride, polyvinyl acetate, polyamide,
Alternatively, either acrylic acid ester or a mixture thereof is preferable.

When epoxy or urethane is used as the matrix polymer, the polymer is cured with a polyamine-based or polyamidoamine-based curing agent.
Further, depending on the type of matrix polymer, it is cured using a crosslinking agent or a vulcanizing agent. This matrix polymer contains a fiber reinforcement to strengthen the vibration-damping composite material.

As the fiber reinforcing material, for example, one kind selected from carbon fiber, glass fiber, aramid fiber, boron fiber, alumina fiber, silicon carbide fiber, and metal fiber, or a combination of two or more kinds of these fibers is used. Can be used. The fiber length and the fiber diameter of the fiber reinforcement are arbitrary, and should be appropriately determined in consideration of the type and content of the polymer, the content of the fiber reinforcement, the application and use state of the vibration damping composite material, and the like. Good. Further, as the form of the fiber reinforcing material, in addition to the fibrous form, a form of a fibrous body formed into a shape of a place where vibration damping is required can be adopted.

The fiber reinforcing material is preferably contained in a proportion of 10 to 500 parts by weight with respect to 100 parts by weight of the matrix polymer. When the content of the fiber reinforcement is less than 10 parts by weight, sufficient effect of increasing the strength of the vibration damping composite material cannot be expected, and when it exceeds 500 parts by weight, embrittlement of the vibration damping composite material proceeds. Will be done.

The above matrix polymer including the fiber reinforcement has sufficient strength by itself. However, it is hard to say that the damping performance is sufficient.
Therefore, in the vibration damping composite material of the present invention, an organic vibration damping agent is blended in the matrix polymer. By blending the organic vibration damping agent in the matrix polymer, the vibration damping performance of the vibration damping composite material is dramatically improved.

Examples of organic vibration damping agents having such a function include N, N-dicyclohexylbenzothiazyl-2-sulfenamide (DCHBSA), 2-mercaptobenzothiazole (MBT), dibenzothiazyl sulfide ( MBTS), N-cyclohexylbenzothiazyl-2-sulfenamide (CBS), N-ter
t-Butylbenzothiazyl-2-sulfenamide (B
BS), N-oxydiethylenebenzothiazyl-2-sulfenamide (OBS), N, N-diisopropylbenzothiazyl-2-sulfenamide (DPBS) and other compounds having a benzothiazyl group, an azole group on the benzene ring 2- {2'-hydroxy-3 'having benzotriazole as a mother nucleus having a phenyl group bonded thereto
-(3 ", 4", 5 ", 6" Tetrahydrophthalimidemethyl) -5'-methylphenyl} -benzotriazole (2HPMMB), 2- {2'-hydroxy-5 '
-Methylphenyl} -benzotriazole (2HMP
B), 2- {2'-hydroxy-3'-t-butyl-
5'-methylphenyl} -5-chlorobenzotriazole (2HBMPCB), 2- {2'-hydroxy-
Compounds having a benzotriazole group such as 3 ', 5'-di-t-butylphenyl} -5-chlorobenzotriazole (2HDBPCB), ethyl-2-cyano-3,3
A compound having a diphenyl acrylate group such as di-phenyl acrylate, or 2-hydroxy-4-
Examples thereof include one kind or a mixture of two or more kinds selected from compounds having a benzophenone group such as methoxybenzophenone (HMBP) and 2-hydroxy-4-methoxybenzophenone-5-sulphonic acid (HMBPS).

The compounding amount of the organic vibration damping agent is preferably 1 to 100 parts by weight with respect to 100 parts by weight of the matrix polymer. If the amount is less than 1 part by weight, the sufficient effect of dramatically improving the vibration damping performance cannot be obtained, and if it exceeds 100 parts by weight, the organic vibration damping agent is contained in the matrix polymer. However, the effect of the amount exceeding 100 parts by weight cannot be expected.

The vibration-damping composite material of the present invention contains an inorganic material such as mica flakes, glass pieces, calcium carbonate, barite, and precipitated barium sulfate for the purpose of further increasing the vibration-damping property and strength of the vibration-damping composite material. Fillers can be filled.

Further, this vibration-damping composite material contains an antioxidant, a reinforcing agent / reinforcing agent, an antistatic agent, a flame retardant, a lubricant, as long as it does not impair the vibration-damping property and strength of the vibration-damping composite material. Additives such as a foaming agent and a coloring agent can be appropriately mixed.

The vibration-damping composite material of the present invention is a plate-shaped, rod-shaped,
It is molded into various shapes such as spherical shape according to the application. Further, the vibration-damping composite material of the present invention can be laminated and integrated with another material such as a plate material or a steel plate to form a composite.

When the damping composite material of the present invention is molded into a plate shape, a rod shape, a spherical shape, or the like, for example, the above matrix polymer, the fiber reinforcing material, and the organic vibration damping agent are blended in a predetermined ratio, and this is blended. It is possible to employ a molding method such as kneading using a Banbury mixer, a roll or the like, and further molding into a shape according to the application and purpose by a calendar method, an extrusion method or the like.

Further, in the vibration-damping composite material of the present invention, when the place where vibration damping is required has a complicated shape, a liquid matrix polymer is used, and a fiber reinforcing material and an organic vibration damping agent are used. It is also possible to adopt a method of spraying a mixed solution containing a predetermined proportion to a place where vibration damping is required, and then heating and pressurizing to cure.

Further, the fiber reinforcing material is not limited to the fibrous shape,
It is also possible to take the form of a fibrous body molded into the shape of a place where vibration damping is required. In this case, the matrix polymer excluding the fiber reinforcement and the organic vibration damping agent are blended in a predetermined ratio and kneaded. It is desirable to adopt a method of casting or impregnating the above-mentioned fibrous body and then curing.

The present invention is not limited to the following examples and can be implemented by freely changing it within the scope described in "Claims".

[0031]

EXAMPLE 1 13.9% by weight of a bisphenol A type epoxy resin as a matrix polymer, 4.1% by weight of a polyoxyalkylene diglycidyl ether type epoxy resin, and 0.5% of DCHBSA as an organic vibration damping agent. % By weight, and polyamidoamine as a curing agent at a ratio of 1.5% by weight.
Toray Co., Ltd.) was impregnated and 15 carbon fiber woven fabrics containing this mixed solution were laminated on top of each other and integrated to obtain a vibration damping composite material. The mixed solution, when impregnated into the carbon fiber woven fabric,
Impregnation was performed so that the weight thereof was 20% by weight (the total weight of the carbon fiber woven fabric was 80% by weight).

The loss coefficient (η) and the flexural modulus (GPa) of the obtained vibration-damping composite material were measured, and the results are shown in FIGS. 1 and 2, respectively.

The loss factor (η) of the vibration damping composite material is 2
It is data at 5 ° C and 200 Hz, and its measurement is made by Ono Sokki Co., Ltd. central excitation method loss coefficient measuring device
F5200 type) was used. In addition, the flexural modulus (GP
The measurement of a) was performed by the three-point bending test specified in JIS K7074.

Example 2 An example except that 9.3 wt% of bisphenol A type epoxy resin, 8.3 wt% of polyoxyalkylene diglycidyl ether type epoxy resin and 0.9 wt% of DCHBSA were blended. A vibration-damping composite material was obtained in the same manner as in 1. The obtained damping composite material was measured for loss factor (η) and flexural modulus (GPa) in the same manner as in Example 1,
The results are shown in FIGS. 1 and 2, respectively.

Comparative Example Example 1 except that bisphenol A type epoxy resin was blended at 18.5% by weight, polyoxyalkylene diglycidyl ether type epoxy resin at 0.0% by weight and DCHBSA at 0.0% by weight. A vibration-damping composite material was obtained in the same manner as in. With respect to the obtained vibration-damping composite material, the loss coefficient (η) and the flexural modulus (GPa) were measured in the same manner as in Example 1, and the results are shown in FIGS. 1 and 2, respectively.

From FIG. 2, the flexural modulus (GPa) of the comparative example in which the organic vibration damping agent was not blended, and Example 1 in which the organic vibration damping agent was blended at 0.5% by weight, and the organic vibration damping agent Example 2 in which 0.9% by weight was blended shows the same flexural modulus (GPa), and the flexural modulus (GPa) is not affected by the blending of the organic vibration damping agent. I understand.

On the other hand, looking at the loss factors (η) of Examples 1 and 2 and the comparative example shown in FIG. 1, the loss factor (η) of Example 1 is the loss factor (η) of the comparative example. ),
It can be seen that the vibration damping property is improved by about 40%, and the vibration damping property is improved to the level of the loss coefficient (η) of Example 2 which is about four times that of the comparative example.

From the results shown in FIG. 1 and FIG. 2, the organic vibration-damping agent dispersed in the matrix polymer does not reduce the strength of the fiber reinforcement contained in the matrix polymer, and the vibration damping property is greatly improved. It was confirmed that it will be improved.

[0039]

In the vibration-damping composite material of the present invention, the organic vibration-damping agent compounded in the matrix polymer does not reduce the strength of the vibration-damping composite material and leap in vibration damping property. The vibration-damping composite material thus has both high strength and excellent vibration-damping property.

[Brief description of drawings]

FIG. 1 is a graph showing a loss coefficient (η) in each of the vibration damping composite materials of Examples 1 and 2 and Comparative Example.

FIG. 2 is a graph showing flexural modulus (GPa) of each of the vibration damping composite materials of Examples 1 and 2 and Comparative Example.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08K 5/105 C08K 5/105 5/3475 5/3475 5/46 5/46 7/02 7/02 F16F 15/02 F16F 15/02 QF term (reference) 3J048 AA01 AB01 AC02 AC03 BD01 DA06 EA07 4F072 AA02 AA07 AA08 AB06 AB08 AB09 AB10 AB11 AD06 AD08 AD09 AD13 AD21 AD23 AD38 AD43 AD44 AD47 AE14 AF15 AF27 AG03 AG17 A14 AH02 AH02 AH02 AH02 AH02 AH02 AL02 AL11 AL16 AL17 4J002 BD031 BF021 BG041 CC031 CC181 CD001 CF211 CK021 CL001 CL062 CP031 DA016 DA066 DE146 DJ006 DK006 DL006 EE037 EH077 EU177 EV327 FD012 FD016 FD207 GL00 GM00 GN00 GQ00

Claims (6)

[Claims] 1. A vibration-damping composite material comprising a matrix polymer and a fiber reinforcement contained in the matrix polymer, wherein an organic vibration-damping agent is blended in the matrix polymer. material. 2. The matrix polymer is any one of unsaturated polyester, epoxy, phenol, melamine, urethane or silicon resin, or a mixture thereof, polyvinyl chloride, polyvinyl acetate, polyamide, or an acrylic ester, Alternatively, the vibration-damping composite material according to claim 1, which is a mixture thereof. 3. The fiber reinforcing material comprises one or more selected from carbon fiber, glass fiber, aramid fiber, boron fiber, alumina fiber, silicon carbide fiber, and metal fiber. The vibration damping composite material according to claim 1. 4. The fiber reinforcement is a matrix polymer 10
The vibration damping composite material according to claim 3, wherein the vibration damping composite material is contained in an amount of 10 to 500 parts by weight relative to 0 parts by weight. 5. The organic vibration damping agent is one or more selected from compounds having a benzothiazyl group, compounds having a benzotriazole group, compounds having a diphenylacrylate group, and compounds having a benzophenone group. The vibration-damping composite material according to claim 1, which is a mixture of 6. The vibration-damping composite material according to claim 5, wherein the organic vibration-damping agent is blended in a ratio of 1 to 100 parts by weight with respect to 100 parts by weight of the matrix polymer.