JP2003096621A - High-viscosity energy-conversion fiber, sound-absorbing material made therefrom and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems of high-viscosity energy-conversion fibers comprising the difficulty in producing the fiber with an ordinary melt-spinning apparatus and the difficult handling owing to its brittleness at normal temperature. SOLUTION: The cross-section of the high-viscosity energy-conversion fiber A is composed of a layer 1 made of a resin containing a piezoelectric material and resin layers 2a, 2b made of a resin. The fiber having this structure is easily producible e.g. by cutting and has sufficient flexibility to solve the problem of the brittleness at normal temperature.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an energy conversion fiber made of a resin containing a piezoelectric material, and a high viscosity energy conversion fiber having a high viscosity characteristic having an MFR value of 5 g / 10 min or less. The present invention relates to a sound absorbing member and a manufacturing method thereof.

[0002]

2. Description of the Related Art As a general synthetic fiber manufacturing method,
There is a method called “melt spinning” in which a resin is heated and melted and discharged from a spinneret made of a metal or the like, which is stretched and formed into a predetermined thickness.

[0003]

By the way, in recent years,
For example, as a material used for sensors, there is an energy conversion fiber in which a resin as a base material of the fiber contains a piezoelectric material. However, such an energy conversion fiber cannot be discharged from a conventional melt spinning apparatus at present because the resin viscosity at the time of melting is high due to the inclusion of a piezoelectric material, and it is difficult to handle because it is brittle at room temperature. However, the problem was to solve these problems.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is a high-viscosity energy conversion that can be easily manufactured and can eliminate brittleness at room temperature. An object is to provide a fiber and a method for producing the fiber.

[0005]

A high-viscosity energy conversion fiber according to the present invention has a piezoelectric material-containing layer formed of a resin containing a piezoelectric material in a cross section of the fiber as described in claim 1. A resin layer formed of a resin is provided, and as described in claim 2, the piezoelectric material-containing layer has a three-layer structure having resin layers on both sides, and the viscosity of the piezoelectric material-containing layer is It is characterized by lowering the viscosity of the resin layer.

In the above structure, the resin used for the piezoelectric material-containing layer and the resin layer is, for example, nylon 6,
Aliphatic polyamide (PA) such as nylon 66, polyester such as polyethylene terephthalate (PET),
Polyphenylene sulfide (PPS), polyether ketone (PEK), polyvinylidene fluoride (PVD)
F), epoxy resin, and the like, but not particularly limited, and there is no problem in production regardless of which resin is used.

In the high-viscosity energy conversion fiber according to the present invention, as described in claim 3, the MFR value of the piezoelectric material-containing layer is 1 to 4.9 g / at a temperature of 270 ± 20 ° C.
It is 10 min, and the MRF value of the resin layer is at a temperature of 270 ± 2.
It is characterized by being 5 to 200 g / 10 min at 0 ° C.

The resin used for the piezoelectric material-containing layer is difficult to be made into fibers by a conventional melt spinning apparatus, that is, the MFR value is 1 to 4.9 g / 10 mi at a temperature of 270 ± 20 ° C.
It is preferably n, which improves performance over a wider frequency band than fibers produced by melt spinning. The resin used for the resin layer is MF at a temperature of 270 ± 20 ° C.
The R value is preferably 5 to 200 g / 10 min. That is, by holding the piezoelectric material-containing layer with the resin layer having a lower viscosity than the piezoelectric material-containing layer, it is made into fibers without impairing the flexibility.

Furthermore, in the high-viscosity energy conversion fiber according to the present invention, as described in claim 4, the piezoelectric material contained in the piezoelectric material-containing layer is 100 to 20 with respect to the resin amount.
The amount of the piezoelectric material contained in the piezoelectric material-containing layer is 200 to 850% by mass with respect to the amount of resin.

That is, the amount of the piezoelectric material contained in the piezoelectric material-containing layer is preferably 100% by mass to 2000% by mass at the maximum with respect to the base amount, which is the minimum amount at which melt spinning cannot be performed by mixing with the resin. Desirably 200-8
By setting the range to 50% by mass, the sound absorbing performance, the sound insulating performance, the workability, and the like are optimized.

Further, the high-viscosity energy conversion fiber according to the present invention is characterized in that the piezoelectric material-containing layer contains a conductive material as described in claim 6, and As described above, the conductive material contained in the piezoelectric material-containing layer is 0.01 to 5 mass% with respect to the amount of the piezoelectric material.

By including a conductive material in the piezoelectric material-containing layer, the internal resistance value of the piezoelectric material-containing layer changes, and it becomes possible to control the performance by focusing on a specific frequency band. When the content of the conductive material is 5% by mass or more, the internal resistance of the piezoelectric material-containing layer (the resistance value of the pseudo circuit around the inorganic powder or granular material) becomes close to 0Ω, and the performance deteriorates. Since the resin viscosity sometimes increases and the workability also deteriorates, it is preferably in the range of 0.01 to 5 mass% with respect to the amount of piezoelectric material.

Further, in the high-viscosity energy conversion fiber according to the present invention, as described in claim 8, the piezoelectric material-containing layer accounts for 10 to 90% in the cross section of the fiber.
As described in claim 9, the piezoelectric material-containing layer occupies 35 to 65% of the cross section of the fiber.

That is, when the frequency to be reduced is adjusted by changing the compounding amount of the piezoelectric material and the conductive material, the flexibility and strength of the fiber are greatly changed. The proportion of the piezoelectric material-containing layer in the fiber cross section is preferably 10 to 90%. If the ratio is 10% or less, the energy conversion effect is small and the performance is not exhibited, and if the ratio is 90% or more, it is necessary to reduce the amount of piezoelectric material or conductive material mixed due to the fibers becoming hard and brittle. , The effective frequency range is narrowed. More preferably, by setting the proportion of the piezoelectric material-containing layer in the cross section of the fiber to 35 to 65%, the flexibility of the fiber is not lowered, and the effect can be exhibited in a wide range of frequency bands.

Furthermore, the high-viscosity energy conversion fiber according to the present invention is characterized in that, as described in claim 10, the cross-sectional shape of the fiber is square or rectangular. In other words, by making the cross-sectional shape of the fiber square or rectangular, processing work after manufacturing is unnecessary, and in the case of a rectangular cross-section, it is easy to deform in the direction along the short side. Since the direction of deformation of can be controlled, when the piezoelectric containing layer is multilayered,
Further, the frequency can be narrowed down to exert the energy conversion effect.

Further, the high-viscosity energy conversion fiber according to the present invention is characterized in that, as described in claim 11, the aspect ratio of the cross-sectional shape of the fiber is 1: 1 to 1: 5. . When the aspect ratio of the fibers is outside the range of 1: 1 to 1: 5, the fibers are less likely to be entangled with each other in the case of a fiber aggregate, and the workability and sound vibration performance (sound absorption and vibration damping effect) are deteriorated. To do.

Further, the high-viscosity energy conversion fiber according to the present invention is characterized in that, as described in claim 12, the length of one side in the cross section of the fiber is 5 mm or less. The maximum length of one side of the fiber cross section is 5 mm due to the flexibility of the fiber. Also, the finer the fiber, the higher the sound vibration performance.

Furthermore, in the high-viscosity energy conversion fiber according to the present invention, as described in claim 13, the piezoelectric material is barium titanate (BaTiO ₃ ) or lead zirconate titanate (PZT). Is characterized by.

Typical examples of piezoelectric materials having uniform spontaneous polarization used in energy conversion fibers include quartz, Rochelle salt, potassium phosphate (KDP), ammonium phosphate (ADP), lithium niobate, and titanium. Barium acid,
Lead titanate, lead zirconate, lead zirconate titanate (P
ZT), lead metaniobate, bismuth titanate, and strontium bismuth tantalate. In addition to these, various complex oxides are used as the piezoelectric body, and are mainly composed of an element selected from the IVa group transition element or the IVb group element and an alkaline earth metal.

This is because by using an element selected from these as a complex oxide containing an alkaline earth metal, higher piezoelectric performance can be obtained as compared with the case of other elements.
Here, the group IVa transition element is Ti (titanium), Zr.
(Zirconia), and Hf (hafnium), I
Vb group elements are C (carbon), Si (silicon), G
e (germanium), Sn (tin), and Pb (lead). Among these elements, in Group IVa, Ti and Zr
Is particularly large in contribution to the piezoelectric effect, and in Group IVb, Sn and Pb are particularly large in contribution to the piezoelectric effect, which is effective in constructing the present invention. These complex oxides are Ti and Ba, Ti and Sr, Ti and C.
It is particularly effective to be selected from a and a complex oxide composed of a combination of Ti and Mg. This is because the piezoelectric effect is greatest when these elements are combined.

In addition, combinations of other elements such as lead lanthanum zirconate titanate (PLZT), lithium lead zirconate titanate, and lead lanthanum lithium zirconate titanate (PLLZT) are also effective as piezoelectric substances. It is effective to use. Of these, the piezoelectric material is preferably selected from barium titanate (BaTiO ₃ ) or lead zirconate titanate (PZT). This is because these materials are inexpensive and have high performance as a piezoelectric body, and are easily available on the market, so that high-performance fibers can be obtained at low cost.

Further, the high-viscosity energy conversion fiber according to the present invention is characterized in that, as described in claim 14, the conductive material is carbon black or carbon fiber. In other words, by mixing carbon black or carbon fiber, it becomes possible to change the resistance value of the pseudo circuit around the inorganic powder or granular material, and by changing the resistance value, the sound is absorbed in the desired frequency range. Fibers are obtained.

Further, the sound absorbing member according to the present invention is, as described in claim 15, a sound absorbing member comprising a fiber assembly using the high viscosity energy converting fiber according to any one of claims 1 to 14. In addition, it is characterized in that binder fibers having a function of heat fusion with other fibers are mixed at least on the surface and thermoformed.

Furthermore, the sound insulation structure according to the present invention is characterized in that, as described in claim 16, the sound absorbing member according to claim 15 is attached to a plate-like material for sound insulation. I am trying.

Further, the vehicle interior material according to the present invention is
As described in claim 17, the sound absorbing member according to claim 15 is used, and as described in claim 18, the sound absorbing member according to claim 15 is used as an air cleaner for a vehicle. The invention is used in at least one of the inside of a system system and the inside of an engine cover,
As described in claim 9, the sound absorbing member according to claim 15 is used for the entire surface or a part of the sound absorbing member for a dash insulator of a vehicle, and as described in claim 20, The sound absorbing member according to claim 15 is used on the entire surface or a part of a sound absorbing member for a floor carpet of a vehicle, and as described in claim 21, the sound absorbing member according to claim 15 is used. It is characterized in that it is used for at least one whole surface or a part of a tunnel portion of a vehicle floor panel, a rear parcel portion, an inside of an instrument panel, various pillars, a roof panel portion, and a dash lower portion.

According to the method for producing a high-viscosity energy conversion fiber according to the present invention, as described in claim 22, in producing the high-viscosity energy conversion fiber according to any one of claims 1 to 14, a piezoelectric material is used. A piezoelectric material-containing layer formed into a film with a resin containing a material, a resin layer formed of a resin having a viscosity lower than that of the resin of the piezoelectric material-containing film is provided on both surfaces to form a three-layer laminated film, It is characterized in that the laminated film is cut from an end portion with a predetermined width to form a high-viscosity energy conversion fiber in which the piezoelectric material-containing layer is sandwiched between resin layers.

Further, in the method for producing a high-viscosity energy conversion fiber according to the present invention, as described in claim 23, a resin layer formed in a film shape is heated and pressed on both surfaces of the piezoelectric material-containing layer. A laminated film is formed by laminating the laminated film by the above method, and the ambient temperature at the time of laminating is 150 to 270 ° C. as described in claim 24.
And applying a pressure of 1 to 50 kg / cm ^2, and as described in claim 25, by applying a molten resin to both surfaces of the piezoelectric material-containing layer and drying, 28. A laminated film is formed, and as described in claim 26, a plurality of laminated films are stacked, and the end portions thereof are cut with a predetermined width, and the laminated film is described in claim 27. As described above, the laminated film is wound into a roll shape, and its end portion is cut into a predetermined width.

As a method for producing the high-viscosity energy conversion fiber, a method is used in which a laminated film composed of a piezoelectric material-containing layer and a resin layer is finely cut into fibers. When fibers are produced by this method, it is possible to produce fibers using a high-viscosity energy conversion resin that cannot be produced by a conventional melt spinning apparatus.

In order to produce a laminated film, a piezoelectric material-containing layer and a resin layer containing no piezoelectric material are previously formed into a film shape, and the piezoelectric material-containing layer is sandwiched between the resin layers, and each layer is heated and pressed. Stick together. That is, the resin is softened to some extent by heating, and the resin is adhered by applying pressure and the thickness is adjusted. Further, by making the resin layer on the outer side, the brittle piezoelectric material-containing layer is retained, and continuous fiberization by subsequent cutting is possible.

The operation of attaching the piezoelectric material-containing layer and the resin layer is as follows.
For example, it is carried out in an oven, and the ambient temperature in the apparatus is preferably 150 to 270 ° C. That is, by softening the resin, the adhesion between the piezoelectric material-containing layer and the resin layer is increased, and the piezoelectric material-containing layer is prevented from falling off. Further, the applied pressure is preferably from 1 to 50 kg / cm ² , and at a pressure higher than this, the laminated film becomes too thin to hold the piezoelectric material-containing layer and the fiber becomes brittle.

The laminated film which has been bonded is cut into a plurality of layers so that the force applied when the cutting blade is in contact with the laminated film is dispersed, so that the laminated film is prevented from being deformed and is cut at a time. A large amount of fiber.

As an apparatus for producing fibers, for example, an apparatus in which a cylinder for extruding the laminated film and a cutting blade are interlocked is used, and the thickness of the fibers is controlled by adjusting the extrusion amount of the laminated film. Even when the laminated films laminated together are continuously wound into a roll, the fiber cutting operation can be performed using the same device as described above.

In order to enhance the adhesion between the piezoelectric material-containing layer and the resin layer not containing the piezoelectric material, both surfaces of the piezoelectric material-containing layer should be
The resin that has been melted by heating is applied so as to have a uniform thickness. When applying the molten resin in this way, it is possible to easily adjust the thickness of the resin layer by using a guide such as a brush.

[0034]

The high-viscosity energy conversion fiber according to claim 1 of the present invention comprises the piezoelectric material-containing layer containing the piezoelectric material and the resin layer, so that, for example, a laminated film composed of each layer is cut. It is possible to fiberize by adopting the manufacturing method, and it becomes possible to easily obtain high-viscosity energy conversion fibers that could not be manufactured by the conventional melting prevention device, and at the same time, at the room temperature by the resin layer. The brittleness of the fiber can be eliminated, and in addition, the frequency control can be easily dealt with by adjusting the amount of the piezoelectric material.

According to the high-viscosity energy conversion fiber of the second aspect of the present invention, the same effect as that of the first aspect can be obtained, and the resin layer having a low viscosity is provided on both sides of the piezoelectric material-containing layer. With the layered structure, the piezoelectric material-containing layer can be held by the resin layer to further enhance flexibility.

According to the high-viscosity energy conversion fiber according to claim 3 of the present invention, the same effect as that of claim 2 can be obtained, and the MFR value of the piezoelectric material-containing layer is 1 to 4.9.
g / 10min, MRF value of resin layer is 5 ~ 200g
By setting / 10 min, the performance can be improved in a wider frequency band than the fiber produced by melt spinning, and further flexibility can be obtained.

According to the high-viscosity energy conversion fiber of claim 4 of the present invention, the same effects as those of claims 1 to 3 can be obtained, and the amount of piezoelectric material contained in the piezoelectric material-containing layer is 100 to 10. By setting the content to 2000% by mass, the sound absorbing performance, sound insulating performance, workability, etc. can be optimized.

According to the high-viscosity energy conversion fiber of the fifth aspect of the present invention, the same effects as those of the first to third aspects can be obtained, and the amount of the piezoelectric material contained in the piezoelectric material-containing layer is 200-. Sound absorption performance,
The sound insulation performance and workability can be further improved.

With the high-viscosity energy conversion fiber according to claim 6 of the present invention, it is possible to obtain the same effects as in claims 1-5, and further, by containing a conductive material in the piezoelectric material-containing layer. By changing the internal resistance value of the piezoelectric material-containing layer, the performance can be controlled by focusing on a specific frequency band.

According to the high viscosity energy conversion fiber of the seventh aspect of the present invention, the same effect as the sixth aspect can be obtained, and the amount of the conductive material contained in the piezoelectric material-containing layer is 0.01 to. By setting the content to 5% by mass, the internal resistance value of the piezoelectric material-containing layer can be changed and narrowed down to a specific frequency band without causing the performance deterioration due to the internal resistance of the piezoelectric material-containing layer approaching 0Ω. You can control the performance.

According to the high viscosity energy conversion fiber of the eighth aspect of the present invention, the same effects as those of the first to seventh aspects can be obtained, and the ratio of the piezoelectric material-containing layer in the fiber cross section is 10 to 90. When the frequency is adjusted to be reduced by changing the compounding amount of the piezoelectric material and the conductive material, the content of% ensures sufficient energy conversion effect and sufficient frequency range, and the flexibility and strength of the fiber. Can be suppressed to a minimum.

With the high-viscosity energy conversion fiber according to claim 9 of the present invention, the same effect as in claim 8 can be obtained, and the ratio of the piezoelectric material-containing layer in the fiber cross section is 35 to 65%. By doing so, it is possible to more reliably prevent deterioration of the flexibility of the fiber, and it is possible to exert an effect in a wider frequency band.

According to the high viscosity energy conversion fiber of the tenth aspect of the present invention, the same effects as those of the first to ninth aspects can be obtained, and the cross-sectional shape of the fiber is square or rectangular. Since post-manufacturing processing is not required, it is possible to reduce man-hours and cost, and especially when the cross-sectional shape is rectangular, the direction of fiber deformation can be controlled. Therefore, in the case where the piezoelectric-containing layer has a multi-layer structure, the frequency can be further narrowed down to exert the energy conversion effect.

According to the high viscosity energy conversion fiber of the eleventh aspect of the present invention, the same effect as that of the tenth aspect can be obtained, and the aspect ratio of the cross-sectional shape of the fiber is 1: 1.
By setting the ratio to ˜1: 5, the fibers can be easily entangled with each other when the fibers are aggregated, and the workability and the sound vibration performance (sound absorption and vibration damping effect) can be favorably maintained. .

According to the twelfth aspect of the present invention, the high-viscosity energy conversion fiber has the same effects as those of the tenth and eleventh aspects, and the length of one side in the cross section of the fiber is 5 mm or less. As a result, high sound vibration performance can be maintained.

According to the high viscosity energy conversion fiber of the thirteenth aspect of the present invention, the same effects as those of the first to twelfth aspects can be obtained, and barium titanate or lead zirconate titanate is used as the piezoelectric material. By using
A high-performance fiber having a large piezoelectric effect can be obtained at low cost.

According to the high-viscosity energy conversion fiber of claim 14 of the present invention, the same effects as those of claims 6 to 13 can be obtained, and the conductive material is carbon black or carbon fiber. It becomes possible to change the resistance value of the pseudo circuit around the inorganic powder, and the change in the resistance value allows the fiber to absorb sound in a desired frequency range.

According to the sound absorbing member of claim 15 of the present invention, good sound absorbing performance and sound insulating performance can be obtained due to the characteristics of the high viscosity energy converting fiber according to any one of claims 1 to 14. In addition, since at least the surface thereof is mixed with a binder fiber having a function of heat-sealing with another fiber and thermoformed, it can be formed into an arbitrary shape, and various types such as a vehicle interior material can be formed. It can be used as an insulator material.

According to the sound insulation structure of the sixteenth aspect of the present invention, due to the characteristics of the sound absorbing member of the fifteenth aspect, good sound insulation performance can be obtained, and the sound absorbing member is attached to the plate member. Since it is attached, in addition to the sound insulation frequency characteristic due to the thickness, weight and material of the plate-shaped material, another frequency characteristic can be given.

According to the vehicle interior material of the seventeenth aspect of the present invention, since the sound absorbing member of the fifteenth aspect is used, noise generated during operation is reduced, and particularly low frequency noise is reduced. It is possible to significantly improve the quietness in the vehicle.

According to the vehicle interior material of the eighteenth aspect of the present invention, the sound absorbing member of the fifteenth aspect is used in at least one of the inside of the air cleaner system system of the vehicle and the inside of the engine cover. It is possible to reduce intake noise and the like in the system system and engine noise.

According to the vehicle interior material of the nineteenth aspect of the present invention, the sound absorbing member according to the fifteenth aspect is used for the entire surface or a part of the sound absorbing member for the dash insulator of the vehicle. The noise from the vehicle can be reduced and the quietness inside the vehicle can be improved.

According to the vehicle interior material of claim 20 of the present invention, since the sound absorbing member according to claim 15 is used for all or part of the sound absorbing member for the floor carpet of the vehicle, it is possible to reduce the noise from the engine. It is possible to absorb a specific frequency of the frequency, reduce noise from the lower part of the vehicle, and further improve quietness in the vehicle.

According to a vehicle interior material of a twenty-first aspect of the present invention, the sound absorbing member of the fifteenth aspect is applied to a tunnel portion of a vehicle floor panel, a rear parcel portion, an instrument panel interior, various pillar interiors, and a roof. Since it is used for at least one whole surface or a part of the panel portion and the dash lower portion, it is possible to absorb sound of a specific frequency at each position inside the vehicle, and efficient sound absorption without waste is achieved inside the vehicle. It can be demonstrated, and the quietness inside the vehicle can be further enhanced.

According to the method for producing a high-viscosity energy conversion fiber according to a twenty-second aspect of the present invention, the high-viscosity energy conversion fiber according to any one of the first to fourteenth aspects can be easily and easily obtained.

According to the method for producing a high-viscosity energy conversion fiber according to a twenty-third aspect of the present invention, the same effect as that of the twenty-second aspect can be obtained, and at the same time, the film containing the piezoelectric material-containing layer is formed. The laminated film can be easily and easily obtained by laminating the resin layer formed into a shape by pressurization and overheating. Particularly, by pressurizing, the thickness of the laminated film can be easily controlled. As a result, the thickness of the fiber can be easily controlled.

According to the method for producing a high-viscosity energy conversion fiber according to a twenty-fourth aspect of the present invention, the same effect as in the twenty-third aspect can be obtained, and the ambient temperature at the time of laminating each layer is 150 to 270. ℃, pressurizing pressure 1-5
By setting it to 0 kg / cm ² , it is possible to enhance the adhesion between the piezoelectric material-containing layer and the resin layer, prevent the piezoelectric material-containing layer from falling off, and secure a thickness that can hold the piezoelectric material-containing layer. It is possible to prevent the situation where the fiber becomes brittle.

According to the method for producing a high-viscosity energy conversion fiber according to a twenty-fifth aspect of the present invention, the same effect as the twenty-second aspect can be obtained, and the resin melted on both sides of the piezoelectric material-containing layer can be obtained. By applying to form a laminated film, the adhesion between the piezoelectric material-containing layer and the resin layer can be further enhanced.

According to the method for producing a high-viscosity energy conversion fiber according to a twenty-sixth aspect of the present invention, the same effects as those of the twenty-second to twenty-fifth aspects can be obtained, and moreover, a plurality of laminated films are superposed and cut. As a result, a large amount of fibers can be cut out at one time while preventing the laminated film from being deformed.

According to the method for producing a high-viscosity energy conversion fiber according to claim 27 of the present invention, the same effects as those of claims 22-25 can be obtained, and the laminated film is wound into a roll and cut. By doing so, it is possible to excellently cut out fibers while preventing deformation of the laminated film.

[0061]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. In order to manufacture the high-viscosity energy conversion fiber according to the present invention, first, the laminated film F shown in FIG. 1 is formed. This laminated film F includes a piezoelectric material-containing layer 1 formed in a film shape by dispersing a piezoelectric material or a piezoelectric material and a conductive material in a resin, and two resin films formed by forming a resin containing no piezoelectric material into a film shape. By using the layers 2a and 2b and pressing the layers 1, 2a and 2b with a pair of rollers 3a and 3b to bond them together, the piezoelectric material-containing layer 1 is formed into a resin layer
It is formed in a three-layer structure sandwiched between a and 2b. The formation of the laminated film F is performed in a temperature-controlled oven device (not shown), and the layers 1, 2a and 2b are bonded together while being heated.

The piezoelectric material-containing layer 1 and the resin layers 2a and 2b have different softening points due to heating.
By making the softening temperature of a and 2b lower than the softening temperature of the piezoelectric material containing layer 1, the resin layers 2a and 2b can be evenly bonded to the piezoelectric material containing layer 1. Also, the roller 3
A and 3b are coated with a release agent or the like in order to prevent the softened resin from adhering, and the thickness of the laminated film F can be controlled by adjusting the distance between them.

The above laminated film F can also be formed by the method shown in FIG. That is, the piezoelectric material-containing layer 1 previously formed in a film shape is fed horizontally, and a feeding device that makes a U-turn of the piezoelectric material-containing layer 1 downward by a plurality of guide rollers 4 is used. Nozzles 5a and 5b for ejecting resin containing no material are arranged. At this time, the resin is discharged in a molten state by heating. Brushes 6a and 6b for spreading the discharged resin to a uniform thickness are provided near the nozzles 5a and 5b.

Then, while the piezoelectric material-containing layer 1 is being fed at a constant speed, the molten resin is discharged from the nozzle 5a to one surface of the piezoelectric material-containing layer 1 on the upper side, and the resin is uniformly brushed with the brush 6a. To form a resin layer 2a on one side, and similarly on the lower side, the molten resin is discharged from the nozzle 5b to the other surface of the piezoelectric material-containing layer 1, and the resin is evenly brushed with a brush 6b. To the other resin layer 2b
To form. In this case, high adhesion between the piezoelectric material-containing layer 1 and the resin layers 2a, 2b can be obtained without heating the whole, and the angles or heights of the brushes 6a, 6b can be adjusted. Thus, the thickness of the resin layers 2a and 2b can be controlled.

Laminated film F formed as described above
Is cut into fibers by the cutting device shown in FIGS. 3 and 4.

The cutting apparatus shown in FIG. 3 is for cutting a plurality of laminated films F by stacking them, and the jigs 9a and 9b provided on the base 13 make the stacked surfaces in a vertical direction. The plurality of laminated films F are fixed so as not to shift from each other. A pressing plate 8 connected to a cylinder 14 is in contact with one end of the laminated film F, and a cutting blade 7 that is driven up and down is arranged in the other end of the laminated film F.

The above cutting device cuts the end portion of the laminated film F into a predetermined width by the cutting blade 7 to fiberize the film F. As a result, the resin layers 2a, 2 are formed on both sides of the piezoelectric material-containing layer 1 in the cross section as shown in FIGS.
High viscosity energy conversion fibers A having b are formed.

Further, the cylinder 14 is adapted to interlock with the driving device for the cutting blade 7, and when the cutting blade 7 completes one cutting operation, that is, lowering and ascending, it depends on the thickness of the fiber to be formed. The laminated film F is pushed out together with the pressing plate 8 by a certain amount. Then the cutting blade 7
The cutting by and the extrusion by the cylinder 14 are repeated.

As described above, by stacking a plurality of laminated films F and cutting the laminated films F, the high-viscosity energy conversion fibers A are obtained.
Can be cut without being deformed, and a large number of high-viscosity energy conversion fibers A are formed by cutting once.

The cutting device shown in FIG. 4 is for cutting the laminated film F by winding it in a roll shape, and fixing the laminated film F by arcuate jigs 10a and 10b provided on the base 13. To do. A pressing plate 8 connected to a cylinder 14 is in contact with one end of the laminated film F, and a cutting blade 7 that is driven up and down is arranged in the other end of the laminated film F. In this case as well, the same operation as that of the cutting device shown in FIG. 3 is performed, and the high-viscosity energy conversion fiber A can be cut without being deformed.

FIG. 5 is a diagram showing a high viscosity energy converting fiber A having a square cross section, and FIG. 6 is a diagram showing a high viscosity energy converting fiber A having a rectangular cross section. In particular, the high-viscosity energy conversion fiber A shown in FIG. 6A has a short side in the stacking direction.
The high-viscosity energy conversion fiber A of (b) has a long side in the stacking direction. These high-viscosity energy conversion fibers A have a desired cross-sectional shape by adjusting the ratio between the piezoelectric material-containing layer 1 and the resin layers 2a and 2b, and adjusting the thickness of the laminated film F and the cutting width by a cutting device. Can be

The above-mentioned high-viscosity energy conversion fibers can constitute a sound absorbing member as a fiber assembly. In this case, at least the surface thereof is mixed with a binder fiber having a function of heat-sealing with another fiber and thermoformed. By blending the binder fiber in this way, it becomes possible to perform thermoforming and at the same time to form an arbitrary shape by thermoforming, which can be used as various insulation materials including interior materials for vehicles. .

Here, the fibers constituting the fiber assembly of the sound absorbing member are not particularly limited except that they include the above-mentioned binder fibers, but the above-mentioned binder fibers and, for example, polyethylene terephthalate (PET) are the main components. The sound absorbing member can be obtained at low cost by using fibers that are generally easily available, such as the above-mentioned fibers.

Further, the sound-insulating structure can be obtained by adhering the above-mentioned sound-absorbing member to a plate-shaped material for the purpose of sound insulation. As described above, by attaching the sound absorbing member composed of the fiber assembly using the high-viscosity energy converting fiber according to the present invention to the plate-shaped material, the sound insulating structure used conventionally can be replaced with a more efficient structure. Is possible. This is originally
The sound insulation structure has a sound insulation frequency characteristic due to the thickness, weight and material of the plate-shaped material, but another frequency characteristic can be imparted by attaching the sound absorbing member to the plate-shaped material. Because it will be possible.

Furthermore, it is extremely effective to use the above sound absorbing member as an interior material for a vehicle. In a vehicle that is severely limited in terms of space, weight, cost, etc., it is difficult to reduce noise particularly on the low frequency side. However, using the sound absorbing member according to the present invention improves sound absorption performance and sound insulation performance, and reduces noise. Noise on the frequency side can also be reduced.

Further, it is particularly effective to use the above sound absorbing member inside the air cleaner system or inside the engine cover. The noise generated by the intake air in the intake duct of the engine is one of the sound sources of vehicle noise, and a means for efficiently absorbing the noise is required. In order to reduce the noise particularly in the low frequency region of the noise region, a resonator or a resonance duct whose capacity is adjusted to the target frequency is generally used. This is 5 for sound absorbing members
This is because it is difficult to absorb low frequency sound of 00 Hz or less.

Therefore, as shown in FIG. 7, in the air cleaner 30, as the space on the air intake side and the space on the engine side partitioned by the air filter element 31, for example, the sound absorbing member 3 is provided in the intake passage 32 and the introduction passage 33.
By providing 4, 35, noise in the low frequency region can be reduced. Along with this, it is possible to eliminate part or all of the resonator and resonance duct,
It can also contribute to securing space inside the engine room and reducing costs.

Furthermore, it is effective to use the above sound absorbing member for a dash insulator for a vehicle. As a result, it is possible to absorb a low frequency specific frequency from the engine and prevent noise from entering the vehicle. At this time, the sound absorbing member can be provided on the entire surface or a part of the dash insulator. FIG. 8 shows a case where the sound absorbing members 42 and 43 are partially provided to the dash insulator 41 having the rubber skin 40. That is, when the sound of the specific frequency is generated from the specific portion of the dash portion, it is sufficient to provide the sound absorbing member only in the generated portion, whereby the cost reduction can be realized and the efficient sound absorbing effect can be obtained.

Furthermore, it is effective to use the above sound absorbing member for a floor carpet for vehicles. As a result, it is possible to absorb a low frequency specific frequency from the engine and prevent noise from entering the vehicle. At this time, the sound absorbing member can be provided on the entire surface or a part of the floor carpet. FIG. 9 shows a case where the sound absorbing members 52 and 53 are partially provided on the insulator 51 having the carpet skin 50. That is, when the sound of the specific frequency is generated from the specific portion of the floor panel, it is sufficient to provide the sound absorbing member only in the generated portion, and thereby the cost can be reduced and the efficient sound absorbing effect can be obtained.

Further, it is also effective to provide the above sound absorbing member only beside the tunnel portion (upper side portion of the drive shaft) in the floor panel. This is because the sound from the device inside the tunnel is specifically generated at this portion.

Further, as shown in FIG. 10, the sound absorbing member is the inside of the tunnel portion 60 of the vehicle floor panel, the rear parcel portion 61, the instrument panel 62, the inside of the front pillar 63, and the inside of the center pillar 64. , The inside of the rear pillar 65, the roof panel portion 66, and the dash lower portion 67 are effectively used for at least one entire surface or a part thereof. By absorbing sound of a specific frequency at each position inside the vehicle, it is possible to exhibit efficient sound absorption without waste in the vehicle.

Example 1 PA was used as the base resin, BaTiO ₃ was used as the piezoelectric material, and carbon fiber was used as the conductive material to form a film-shaped piezoelectric material-containing layer. The amount of piezoelectric material at this time is 800% by mass with respect to PA.
The conductive material amount is 0.15% by mass with respect to the piezoelectric material amount.
By blending so that the piezoelectric MFR value becomes 3.
It was set to 0 g / 10 min.

Then, the piezoelectric material-containing layer is sandwiched between resin layers formed into a film using a resin having an MFR value of 95.0 g / 10 min, heated at 210 ° C., and heated to 50 kg.
/ Cm ² was pressed to form a laminated film having a three-layer structure. At this time, in the cross section of the laminated film, the areas of the piezoelectric material-containing layer and the resin layer were adjusted to be 50% each.

A plurality of the above-mentioned laminated films were stacked and the fibers were cut out using the apparatus shown in FIG. At this time, when the aspect ratio in the cross section of the fiber was set to 1: 1 and the length of one side of the cross section of the fiber was adjusted to 0.1 mm and cutting was performed, the fiber could be obtained without any problem.

(Example 2) A laminated film formed in the same manner as in Example 1 was used, and the length of one side of the fiber cross section was 0.
When the fiber was cut to a thickness of 05 mm, fibers could be obtained without any problem.

Example 3 A laminated film formed in the same manner as in Example 1 was used, and the aspect ratio of the cross section of the fiber was 1: 5.
When the fibers were cut to have a rectangular cross section, and the dimensions were adjusted to 1 × 5 mm, the fibers could be obtained without problems.

Example 4 A laminated film formed in the same manner as in Example 1 was used, the ratio of the piezoelectric material-containing layer in the cross section of the laminated film was 10%, and the length of one side of the fiber cross section was 0. When the fiber was cut out to have a diameter of 0.05 mm, fibers could be obtained without any problem.

(Example 5) The aspect ratio of the cross section of the fiber was changed to 1: 5 under the conditions of Example 4, and the cross section of the fiber was 1x5.
When cutting out after adjusting to mm,
I was able to obtain fibers without any problems.

(Example 6) Under the conditions of Example 4, the ratio of the piezoelectric material-containing layer in the cross section of the laminated film was changed to 90%, and the same cutting was performed to obtain fibers without problems. I was able to.

(Example 7) The aspect ratio of the cross section of the fiber was changed to 1: 5 under the conditions of Example 6 so that the cross section of the fiber was 1 × 5.
When the fibers were cut out after being adjusted to have a size of mm, fibers could be obtained without problems.

(Example 8) Under the conditions of Example 1, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer was 5.0 g / 1.
The film was adjusted to 0 min to form a laminated film. On this occasion,
The operation was carried out with the ambient temperature at 210 ° C. However, the resin was not sufficiently melted and the piezoelectric material-containing layer and the resin layer did not adhere to each other. Therefore, when the ambient temperature was raised to 230 ° C. to melt the resin and the laminated film was formed,
The resin melted and adhered to the piezoelectric material-containing layer. After that, when cutting was performed in the same manner as in each of the above-mentioned examples, fibers could be obtained without any problem.

(Example 9) Under the conditions of Example 1, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer was 200.0 g.
When a laminated film was prepared by adjusting to / 10 min and cut out in the same manner as in each of the above Examples, fibers could be obtained without any problem.

Example 10 For the conditions of Example 1,
The amount of piezoelectric material is 2000% by mass, and the amount of conductive material is 0.01
Changed to mass%. Accordingly, the MF of the piezoelectric material-containing layer
The R value was 1.8 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 11) The amount of the conductive material was changed to 5.0% by mass with respect to the conditions of Example 10. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

Example 12 The amount of the piezoelectric material was changed to 100.0% by mass under the conditions of Example 10. Along with this, the MFR value of the piezoelectric material-containing layer was 4.9 g / 10 mi.
It became n. A laminated film is formed using this resin,
When the fibers were cut out, the fibers could be obtained without any problem.

(Example 13) With respect to the conditions of Example 1,
Changed the number of layers. A laminated film was formed by forming the piezoelectric material-containing layer as two layers and as a total of five layers. The other conditions were the same as in Example 1, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 14) The amount of the piezoelectric material was changed to 2000% by mass and the amount of the conductive material was changed to 5.0% by mass under the conditions of Example 13. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 15) For the conditions of Example 1,
When the conductive material was changed from carbon fiber to carbon black and the fiber was cut out under the other conditions in the same manner as in Example 1, the fiber could be obtained without any problem.

(Example 16) Under the conditions of Example 15, the amount of piezoelectric material was changed to 2000% by mass, and the amount of conductive material was changed to 5.0% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. Also, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer is 200.0 g.
It was adjusted to / 10 min, a laminated film was formed using this resin, and the fiber was cut out. As a result, fibers could be obtained without problems.

(Example 17) Under the conditions of Example 16, the amount of piezoelectric material was 100% by mass, and the amount of conductive material was 0.
It was changed to 01% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 4.9 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Embodiment 18) For the conditions of Embodiment 1,
The piezoelectric material was changed to PZT. When the other conditions were the same as in Example 1 and cutting was performed, fibers could be obtained without problems.

(Example 19) The amount of the piezoelectric material was changed to 2000% by mass and the amount of the conductive material was changed to 5.0% by mass under the conditions of Example 18. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Embodiment 20) Under the conditions of Embodiment 18, the amount of piezoelectric material is 100% by mass and the amount of conductive material is 0.01.
Changed to mass%. Along with that, MFR of piezoelectric material-containing layer
The value became 4.9 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 21) [0104] In contrast to the conditions of Example 18, the conductive material was changed from carbon fiber to carbon black, and other conditions were the same as in Example 18 except that the fibers were cut out. The fiber could be obtained.

(Embodiment 22) Under the conditions of Embodiment 21, the amount of piezoelectric material was changed to 2000% by mass, and the amount of conductive material was changed to 5.0% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 23) With respect to the conditions of Example 21, the amount of the piezoelectric material was 100% by mass, and the amount of the conductive material was 0.
It was changed to 01% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 4.9 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Embodiment 24) For the conditions of Embodiment 1,
The base resin was changed from PA to PET. Along with this, the MFR value of the piezoelectric material-containing layer is 2.1 g / 10 mi.
It became n. The molding temperature of the laminated film is 270 ° C.
And The other conditions were the same as in Example 1, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 25) Under the conditions of Example 24, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer was 5.0.
It adjusted to g / 10min and formed the laminated film. The other conditions were the same as in Example 24, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 26) The amount of the piezoelectric material was changed to 2000% by mass and the amount of the conductive material was changed to 5.0% by mass under the conditions of Example 24. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. At the same time, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer is 200.0 g
It was adjusted to / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Embodiment 27) With respect to the conditions of Embodiment 24, the amount of the piezoelectric material is 100% by mass, and the amount of the conductive material is 0.0.
It was changed to 1% by mass. Along with this, M of the piezoelectric material-containing layer
The FR value became 3.5 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Embodiment 28) For the conditions of Embodiment 1,
The base resin was changed from PA to PPS. Along with this, the MFR value of the piezoelectric material-containing layer is 1.5 g / 10 mi.
It became n. The molding temperature of the laminated film is 270 ° C.
And The other conditions were the same as in Example 1, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 29) Under the conditions of Example 28, the MFR value of the resin layer sandwiching the piezoelectric material containing layer was 5.0.
It adjusted to g / 10min and formed the laminated film. The other conditions were the same as in Example 28, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 30) Under the conditions of Example 28, the amount of piezoelectric material was changed to 2000% by mass, and the amount of conductive material was changed to 5.0% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. At the same time, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer is 200.0 g
It was adjusted to / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 31) Under the conditions of Example 28, the amount of piezoelectric material was 100% by mass, and the amount of conductive material was 0.
It was changed to 01% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 2.5 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 32) For the conditions of Example 1,
The base resin was changed from PA to PVDF. Along with this, the MFR value of the piezoelectric material-containing layer was 17.0 g / 10.
It became min. The molding temperature of the laminated film is 21
It was set to 0 ° C. The other conditions were the same as in Example 1, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 33) Under the conditions of Example 32, the MFR value of the resin layer sandwiching the piezoelectric material containing layer was 5.0.
It adjusted to g / 10min and formed the laminated film. The other conditions were the same as in Example 32, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 34) Under the conditions of Example 32, the amount of the piezoelectric material was changed to 2000% by mass, and the amount of the conductive material was changed to 5.0% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 4.9 g / 10 min. At the same time, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer is 200.0 g.
It was adjusted to / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 35) Under the conditions of Example 33, the amount of piezoelectric material was 100% by mass, and the amount of conductive material was 0.
It was changed to 01% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 34.0 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 36) With respect to the conditions of Example 1,
The base resin was changed from PA to PEK. As a result, the MFR value of the piezoelectric material-containing layer was 2.0 g / 10 mi.
It became n. The molding temperature of the laminated film is 360 ° C.
And The other conditions were the same as in Example 1, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 37) Under the conditions of Example 36, the MFR value of the resin layer sandwiching the piezoelectric material containing layer was 5.0.
It adjusted to g / 10min and formed the laminated film. When the fibers were cut under the other conditions in the same manner as in Example 36, the fibers could be obtained without any problem.

(Example 38) In the conditions of Example 36, the amount of the piezoelectric material was changed to 2000% by mass, and the amount of the conductive material was changed to 5.0% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 1.0 g / 10 min. At the same time, the MFR value of the resin layer sandwiching the piezoelectric material-containing layer is 200.0 g
It was adjusted to / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 39) Under the conditions of Example 36, the amount of piezoelectric material was 100% by mass, and the amount of conductive material was 0.
It was changed to 01% by mass. Along with this, the MFR value of the piezoelectric material-containing layer became 4.7 g / 10 min. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 40) For the conditions of Example 1,
The base resin was changed from PA to epoxy resin.
Moreover, the same amounts of the piezoelectric material and the conductive material as in Example 1 were mixed with the epoxy resin and kneaded. A curing agent was mixed with the resin and cured to form a film-shaped piezoelectric material-containing layer. This piezoelectric material-containing layer is sandwiched between resin layers formed into a film using a resin having an MFR value of 95.0 g / 10 min, heated at 210 ° C., and further pressurized at 50 kg / cm ² to form a three-layer structure. A film was formed. In addition, an epoxy resin mixed with a curing agent was applied to form a laminated film having a three-layer structure. The other conditions were the same as in Example 1, and the fibers were cut out, and the fibers could be obtained without any problem.

(Example 41) Under the conditions of Example 40, the MFR value of the resin layer sandwiching the piezoelectric material containing layer was 5.0.
It adjusted to g / 10min and formed the laminated film. At this time, the operation was performed at an ambient temperature of 210 ° C., but the resin was not sufficiently melted and the piezoelectric material-containing layer and the resin layer did not adhere to each other. Then, when the atmosphere temperature was raised to 230 ° C. to melt the resin, the resin was melted and adhered to the piezoelectric material-containing layer. After that, when cutting was performed in the same manner as in each of the above-mentioned examples, fibers could be obtained without any problem.

(Example 42) In the conditions of Example 40, the amount of the piezoelectric material was changed to 2000% by mass, and the amount of the conductive material was changed to 5.0% by mass. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems.

(Example 43) Under the conditions of Example 40, the amount of piezoelectric material was 100% by mass, and the amount of conductive material was 0.
It was changed to 01% by mass. When a laminated film was formed using this resin and the fibers were cut out, the fibers could be obtained without problems. The data of Examples 1 to 23 are shown in Table 1, and the data of Examples 24 to 43 are shown in Table 2.

[0127]

[Table 1]

[0128]

[Table 2]

Comparative Example 1 PA was used as the base resin, BaTiO ₃ was used as the piezoelectric material, carbon fiber was used as the conductive material, and the amount of the piezoelectric material was 80 relative to PA.
0 mass% and the amount of the conductive material is 0.1 with respect to the amount of the piezoelectric material.
It was blended so as to be 5% by mass. Thereby, the piezoelectric MF
The R value was 3.0 g / 10 min.

When the piezoelectric material-containing resin was tried to be made into fibers by using a general melt spinning apparatus, the fibers contained in the piezoelectric material-containing resin had a high MFR value.
(mm) was not discharged and it could not be made into fibers.
Also, an attempt was made to raise the device temperature to raise the piezoelectric MFR value, but there was no effect, and conversely, resin decomposition occurred.

(Comparative Example 2) PA was used as the base resin, BaTiO ₃ was used as the piezoelectric material, and carbon fiber was used as the conductive material to form a piezoelectric material-containing resin film.
At this time, the amount of piezoelectric material is 800 mass% with respect to PA,
The amount of the conductive material was blended so as to be 0.15 mass% with respect to the amount of the piezoelectric material. As a result, the piezoelectric MFR value is 3.0 g / 1.
It became 0 min.

This piezoelectric material-containing resin film was combined with a resin film formed of a resin having an MFR value of 95.0 g / 10 min, heated at 210 ° C., and heated to 50 kg / cm ^2.
And pressure was applied to form a two-layer laminated film. At this time, in the cross section of the laminated film, the area of the resin film layer containing the piezoelectric material and the area of the resin film layer were 50% each.
I adjusted it to be.

When a plurality of the above laminated films were stacked and the fibers were cut out using the cutting device shown in FIG. 3,
The piezoelectric material-containing resin portion could not be held by the resin portion on one side, and the piezoelectric material-containing resin portion was swelled, and fell off from the resin portion to break the fiber.

Next, regarding the piezoelectric fibers (high-viscosity energy conversion fibers) obtained in the above Examples and Comparative Examples, JIS-
The vertical incident sound absorption coefficient was measured based on the vertical incident sound absorption coefficient measuring method for building materials by the in-pipe method of A1405.

Experimental Examples 1 to 5 are Examples 1, 2, 10, and 1.
Align the piezoelectric fibers created in 1, 18 to a fiber length of 50 mm,
Binder fiber made of PET (fiber diameter 2 denier, fiber length 5
1 mm, softening point 140 ° C.), and the sample was thermoformed at a weight ratio of the piezoelectric fiber to the binder fiber of 80:20. The sample has an areal density of 1
a kg / ^{m 2,} thickness 10 mm, is 100 mm in diameter.

Experimental Example 6 is a comparative example, in which PET binder fibers containing no piezoelectric component (fiber diameter 15 denier, fiber length 51 mm, softening point 210 ° C.) were used as the main fibers, and PET binder fibers ( The fiber diameter is 2 denier, the fiber length is 51 mm, and the softening point is 140 ° C.), and the weight ratio of the main fiber to the binder fiber is 80:20.
The sample was thermoformed as. Sample is thickness 1
It is 0 mm and φ100 mm.

Then, in the main pipe 20 of the normal incidence sound absorption coefficient measuring apparatus shown in FIG. 11, the sample S of the above-mentioned Experimental Examples 1 to 6 is set on one end side of the inside thereof, and sound is emitted from the speaker 21 provided on the other end side of the inside. It was generated and the normal incidence sound absorption coefficient was measured. At this time, the measurement frequency range of the normal incident sound absorption coefficient is 10
It was set to 0 to 1600 Hz. Table 3 shows the values of the representative frequencies of the measurement results. The graph of FIG. 12 shows a comparison of measurement results.

[0138]

[Table 3]

In the judgment column of Table 3, the results of the sound absorbing performance comparison are shown by ◯ ×. A sound absorption peak in a specific frequency range of 500 Hz or less, which is a target, and a sound absorption coefficient of 0.5 or more were evaluated as ◯.

Among the experimental examples, the samples of Experimental Examples 1 to 5 using the piezoelectric fiber prepared in the Example were compared with Experimental Example 6 prepared using only the PET fiber in a specific frequency range, particularly 50.
It has been confirmed that it has an excellent sound absorbing property in a specific frequency range of 0 Hz or less and is an excellent sound absorbing member. Experimental example 6
The sample of No. 1 is equivalent to the sound absorbing member using the PET fiber which is generally used, and since the piezoelectric material was not included, the sound absorbing peak did not occur.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a method for forming a laminated film in a process of producing a high-viscosity energy conversion fiber according to the present invention.

FIG. 2 is a side view illustrating another method for forming a laminated film.

FIG. 3 is a perspective view illustrating an example of a laminated film cutting device.

FIG. 4 is a perspective view illustrating another example of a laminated film cutting device.

FIG. 5 is a perspective view showing a high-viscosity energy conversion fiber having a square cross section.

FIG. 6 is a perspective view showing two examples (a) and (b) of high-viscosity energy conversion fibers each having a rectangular cross section.

FIG. 7 is a schematic cross-sectional view showing an example in which a sound absorbing member is provided in the air cleaner system system.

FIG. 8 is a schematic cross-sectional view of essential parts showing an example in which a sound absorbing member is provided in the dash insulator.

FIG. 9 is a schematic sectional view of a main part showing an example in which a sound absorbing member is provided on a floor carpet.

FIG. 10 is a perspective view illustrating various vehicle interior materials.

FIG. 11 is a cross-sectional view schematically showing a normal incidence sound absorption coefficient measuring device.

FIG. 12 is a graph showing the results of measurement of normal incidence sound absorption coefficient for samples of Experimental Examples 1 to 6.

[Explanation of symbols]

A high viscosity energy conversion fiber F laminated film 1 Piezoelectric material-containing layer 2a 2b resin layer 34 35 Sound absorbing member 42 43 Sound absorbing member 52 53 Sound absorbing member

Continued front page    F term (reference) 3D023 BA03 BB01 BB02 BB12 BB17                       BB21 BD01 BD04 BD05 BD08                       BD11 BD12 BD14 BD21 BE04                       BE06 BE31                 4F100 AA33A AA34A AD11 AK01A                       AK01B AK01C AK46 BA02                       BA03 BA10B BA10C CA21A                       CA30A GB32 GB33 JA06A                       JH01 YY00A                 4L041 AA28 BA03 BA05 BA09 BA37                       BC20 BD20 CB02 CB05 CB25                       CB27 CB28 DD04 DD21

Claims (27)

[Claims] 1. A high-viscosity energy conversion fiber comprising a piezoelectric material-containing layer formed of a resin containing a piezoelectric material and a resin layer formed of a resin in a cross section of the fiber. 2. A piezoelectric material-containing layer comprising resin layers on both sides thereof.
The high-viscosity energy conversion fiber according to claim 1, wherein the high-viscosity energy conversion fiber has a layered structure and the viscosity of the resin layer is lower than that of the piezoelectric material-containing layer. 3. The MFR value of the piezoelectric material-containing layer has a temperature of 270.
It is 1 to 4.9 g / 10 min at ± 20 ° C, and the MRF value of the resin layer is 5 to 200 g / 10 m at a temperature of 270 ± 20 ° C.
The high-viscosity energy conversion fiber according to claim 2, wherein the high-viscosity energy conversion fiber is in. 4. The high-viscosity energy conversion fiber according to claim 1, wherein the piezoelectric material contained in the piezoelectric material-containing layer is 100 to 2000 mass% with respect to the amount of resin. 5. The high-viscosity energy conversion fiber according to claim 4, wherein the piezoelectric material contained in the piezoelectric material-containing layer is 200 to 850 mass% with respect to the amount of resin. 6. The high-viscosity energy conversion fiber according to claim 1, wherein the piezoelectric material-containing layer contains a conductive material. 7. The high-viscosity energy conversion fiber according to claim 6, wherein the conductive material contained in the piezoelectric material-containing layer is 0.01 to 5 mass% with respect to the amount of the piezoelectric material. 8. The high-viscosity energy conversion fiber according to claim 1, wherein the piezoelectric material-containing layer accounts for 10 to 90% in the cross section of the fiber. 9. The high-viscosity energy conversion fiber according to claim 8, wherein the piezoelectric material-containing layer accounts for 35 to 65% in the cross section of the fiber. 10. The high-viscosity energy conversion fiber according to claim 1, wherein the cross-sectional shape of the fiber is a square or a rectangle. 11. The aspect ratio of the cross-sectional shape of the fiber is from 1: 1 to 1.
It is 1: 5, The high viscosity energy conversion fiber of Claim 10 characterized by the above-mentioned. 12. The length of one side in the cross section of the fiber is 5 m.
It is m or less, The high viscosity energy conversion fiber of Claim 10 or 11 characterized by the above-mentioned. 13. The piezoelectric material is barium titanate or lead zirconate titanate, as claimed in claim 1.
The high-viscosity energy conversion fiber according to any one of to 12. 14. The conductive material is carbon black or carbon fiber, as claimed in claim 6.
The high-viscosity energy conversion fiber according to any one of 13 above. 15. A sound-absorbing member comprising a fiber assembly using the high-viscosity energy conversion fiber according to any one of claims 1 to 14, and having a function of heat-sealing with another fiber at least on the surface thereof. A sound absorbing member characterized by being thermoformed with a binder fiber mixed therein. 16. A plate-shaped material for sound insulation, comprising:
A sound insulation structure, wherein the sound absorbing member according to item 5 is attached. 17. A vehicle interior material comprising the sound absorbing member according to claim 15. 18. An interior material for a vehicle, wherein the sound absorbing member according to claim 15 is used in at least one of an inside of an air cleaner system system of a vehicle and an inside of an engine cover. 19. An interior material for a vehicle, wherein the sound absorbing member according to claim 15 is used on the entire surface or a part of a sound absorbing member for a dash insulator of a vehicle. 20. An interior material for a vehicle, wherein the sound absorbing member according to claim 15 is used on all or part of a sound absorbing member for a floor carpet of a vehicle. 21. The sound absorbing member according to claim 15, wherein at least one of a tunnel portion of a vehicle floor panel, a rear parcel portion, an inside of an instrument panel, various pillars inside, a roof panel portion, and a dash lower portion is provided. An interior material for vehicles, which is used for the parts. 22. When manufacturing the high-viscosity energy conversion fiber according to any one of claims 1 to 14, a piezoelectric material-containing film is formed on both surfaces of a piezoelectric material-containing layer formed of a resin containing a piezoelectric material in a film shape. A resin layer formed of a resin having a viscosity lower than that of the resin is provided to form a three-layer laminated film, and the laminated film is cut at a predetermined width from the end, and the piezoelectric material-containing layer is sandwiched between the resin layers. A method for producing a high-viscosity energy conversion fiber, which comprises forming the high-viscosity energy conversion fiber. 23. A film-shaped resin layer is adhered to both surfaces of the piezoelectric material-containing layer by heating and pressing,
The method for producing a high-viscosity energy conversion fiber according to claim 22, wherein a laminated film is formed. 24. The ambient temperature at the time of bonding is 150 to
The method for producing a high-viscosity energy conversion fiber according to claim 23, wherein the pressure is 270 ° C and the pressure is 1 to 50 kg / cm ² . 25. The method for producing a high-viscosity energy conversion fiber according to claim 22, wherein a laminated film is formed by applying a molten resin on both surfaces of the piezoelectric material-containing layer and drying the resin. . 26. A stack of a plurality of laminated films, the end of which is cut into a predetermined width.
The method for producing a high-viscosity energy conversion fiber according to any one of 2 to 25. 27. A laminated film is wound into a roll,
The method for producing a high-viscosity energy conversion fiber according to any one of claims 22 to 25, characterized in that the end is cut into a predetermined width.