JP6630513B2 - Manufacturing method of vibration damping rubber sheet - Google Patents

Description

The present invention relates to a method for manufacturing a vibration-damping rubber sheet used for, for example, a house or industrial equipment and suppressing various vibrations.

  The vibration-damping rubber sheet is a flat sheet, for example, a sheet used under the floor of a house to prevent vibration is known. Resin is blended in order to make it 1.0 or more, and a damping rubber material having a JIS A hardness of 25 to 45 degrees and a rebound resilience of 5% or less at room temperature is used.

Such a vibration damping rubber sheet 1 is manufactured by extrusion continuous molding. When passing through a continuous vulcanizing furnace at normal pressure, when the unvulcanized rubber material becomes a high temperature of 150 ° C. or more in the vulcanizing furnace, the figure is obtained. As shown in Fig. 6, the so-called sagging occurs in the material due to the deformation due to the melt flow, so that the height of the cross-sectional shape at the end side becomes lower than at the center and a constant thickness cannot be obtained, so that the aimed vibration reduction is achieved. There is a possibility that the effect cannot be obtained.
In addition, since the vibration-damping rubber sheet 1 has a strong surface adhesiveness, during the production, the conveyance belt in the vulcanizing furnace is softened and adheres due to softening, and the product cannot be removed due to the adhesion. Alternatively, there is a problem that the transport belt may be damaged if it is forcibly removed. Furthermore, when vulcanization is performed over a plurality of vulcanization furnaces, productivity is extremely deteriorated if the vulcanization is carried around a conveyor belt.

  On the other hand, by adhering a cloth material made of fibers to the surface of the damping rubber composition, it is possible to increase the strength and prevent the rubber from sticking to the base, and also prevent the base surface from being stained. It is known (for example, see Patent Document 1).

JP-A-9-22657

  However, since the invention described in Patent Document 1 is obtained by laminating a cloth material having a significantly different material to the vibration damping rubber, it is necessary to add a machine dedicated to the cloth material. There is a problem that the production efficiency is low and the cost is high as compared with the manufactured one.

  Therefore, an object of the present invention is to provide a vibration-damping rubber sheet and a method of manufacturing the vibration-damping rubber sheet, which can solve the problem at the time of vulcanization without deteriorating production efficiency.

In order to achieve the above object, a method for manufacturing a vibration-damping rubber sheet (10) of the present invention is directed to a method of manufacturing a vibration-damping rubber material (20) containing a resin in which the entire bottom surface (21) is thinner than JIS. The one covered with a rubber coating material (30) having an A hardness of 50 to 90 degrees is vulcanized and integrally formed ,
The rubber coating material (30) is applied to the entire bottom surface (21) of the vibration damping rubber material (20) and the thickness (M) of the side surface (22) of the vibration damping rubber material (20). The side surface (22) is covered within a range of a distance equal to or more than 1/4 of the total height (T) to which the thickness (N) is added .

In addition, the present invention further includes a method in which the entire bottom surface (21) of the vibration damping rubber material (20) containing the resin is covered with a rubber coating material (30) thinner than that and having a JIS A hardness of 50 to 90 degrees. It is formed by sulfur molding and integrated.
The rubber coating material (30) is applied to the entire bottom surface (21) of the vibration damping rubber material (20) and the thickness (M) of the side surface (22) of the vibration damping rubber material (20). Characterized in that the side surface (22) is covered within a range of a distance equal to or less than 3/4 of the total height (T) including the thickness (N).

In addition, the present invention further includes a method in which the entire bottom surface (21) of the vibration damping rubber material (20) containing the resin is covered with a rubber coating material (30) thinner than that and having a JIS A hardness of 50 to 90 degrees. It is formed by sulfur molding and integrated.
The vibration damping rubber material (20) is NBR, and the rubber coating material (30) is one of NBR and CR .

Further, the present invention is characterized in that the thickness (N) of the rubber coating material (30) is set to 10% or less of the overall height (T).

  The symbols in parentheses indicate corresponding elements or matters described in the drawings and the embodiments for carrying out the invention described later.

According to the present invention, the entire bottom surface of the resin-containing vibration damping rubber material, which is covered with a thinner rubber coating material having a JIS A hardness of 50 to 90 degrees, is vulcanized and integrated. Therefore, by mounting the high hardness rubber film material side on the conveyor belt in the vulcanization, it is possible to prevent the highly damping rubber material having high adhesiveness from adhering to the conveyor belt and preventing the adhesion of dirt. In addition, it is possible to prevent the transport belt from being damaged or entangled.
Also, by covering the damping rubber material with the rubber film material, deformation due to so-called sagging can be prevented, so that a desired shape can be obtained.
Furthermore, since the vibration damping rubber material and the rubber coating material covering the same are made of the same material called rubber material, the entire material can be manufactured only with rubber material. The production efficiency is better than that using different materials, and no special machine is required.

  Further, according to the present invention, since the thickness of the rubber coating material is made thinner than the thickness of the vibration damping rubber material, it is possible to reduce adverse effects on the vibration damping properties.

  Further, according to the present invention, the entire bottom surface of the damping rubber material is covered with the rubber coating material, and in addition, on the side surface of the damping rubber material, the thickness of the damping rubber material is added to the thickness of the coating material to be 1/1 of the total height. Since the side surfaces are covered in a range of a distance equal to or greater than four, it is possible to prevent the shape from being deformed by preventing sagging and to obtain a target shape capable of exhibiting a sufficient vibration damping function.

  Further, according to the present invention, since the thickness of the rubber coating material is set to 10% or less of the entire height, it is possible to reduce the adverse effect on the vibration damping property.

It is sectional drawing which shows the manufacturing process of the damping rubber sheet which concerns on embodiment of this invention. It is an expanded sectional view of the X section shown in Drawing 1 in a damping rubber sheet concerning an embodiment of the present invention. It is an expanded sectional view of the X section shown in Drawing 1 in another damping rubber sheet concerning the embodiment of the present invention. It is an expanded sectional view of the X section shown in Drawing 1 in still another damping rubber sheet concerning the embodiment of the present invention. It is sectional drawing which shows the other damping rubber sheets which concern on embodiment of this invention. It is sectional drawing which shows the manufacturing process of the damping rubber sheet which concerns on a prior art example.

With reference to FIGS. 1 and 2, a description will be given of a vibration damping rubber sheet and a method of manufacturing the vibration damping rubber sheet according to the embodiment of the present invention.
The vibration damping rubber sheet 10 is provided at various portions for suppressing vibration, and is not particularly limited. However, here, a floor material of the house or an underfloor material for preventing vibration propagating between floors below the floor is used. It is attached to the back side of the floor and is interposed between the floor and the beam or foundation that supports the floor.

The vibration damping rubber sheet 10 is a long, flat sheet, and includes a resin-containing vibration damping rubber material 20 having a JIS A hardness of 20 to 45 degrees, preferably 25 to 35 degrees. It is formed by laminating a rubber coating material 30 having a JIS A hardness of 50 to 90 degrees, preferably 65 to 85 degrees, which is thin and covers the damping rubber material 20 by vulcanization.
The damping rubber material 20 has a rubber having a tan δ (loss coefficient) of 0.5 or more and preferably 0.9 or more near normal temperature (20 ° C.) and a rebound resilience of 5% or less at normal temperature. The resin is blended in 20 to 80 parts, preferably 30 to 70 parts, based on 100 parts of the main polymer. As the resin, for example, a coumarone indene resin, a modified phenol resin, a terpene resin, a modified terpene resin, a terpene phenol resin, a petroleum hydrocarbon resin, polybutene, a rosin derivative, polystyrene, polyvinyl chloride, and the like can be appropriately used. Preferably, a resin having a softening point Sp in the range of 100 to 150 ° C. is used. Here, tan δ of rubber is a value measured according to JIS K6394, and softening point Sp is a value measured according to JIS K2207 “Testing method for softening point (ring and ball method)”.

In such a vibration damping rubber sheet 10, as shown in the upper part of FIG. 1, a vibration damping rubber material 20 and a rubber coating material 30 are simultaneously and continuously extruded.
At this time, as shown in FIG. 2, the entire height of the rubber coating material 30 obtained by adding the thickness N of the rubber coating material 30 to the thickness M of the entire bottom surface 21 of the damping rubber material 20 and the thickness M of the side surface 22 of the damping rubber material 20. The two rubber members 20 and 30 are extruded in a state where the rubber members 20 and 30 are covered from below in a range that is equal to or more than ４ of the thickness T, here, approximately 略. The thickness N of the rubber coating material 30 is 10% or less of the overall height T, and is approximately 10% here.
That is, the entire bottom surface 21 of the damping rubber material 20 is covered with a thin rubber coating material 30 such as 10% of the total height T with respect to the extrusion direction (the direction of the front and back of the paper surface in FIG. 1). The right and left side surfaces 22 are made of a rubber coating material 30 of the same thickness and rise up from the bottom surface 21 to half the height.
As a matter of course, as shown in FIG. 5A, the side surface 22 of the damping rubber member 20 may not be coated, and the entire bottom surface 21 of the damping rubber member 20 may be covered with the rubber coating member 30. As shown in FIG. 5B, the rubber coating material 30 may cover the entire bottom surface 21 of the vibration damping rubber material 20 and may further protrude outside.

The main rubber of the damping rubber material 20 is NBR (nitrile rubber), while the rubber coating material 30 is preferably compatible with the damping rubber material 20. Here, the same NBR as the damping rubber material 20 is used. It was used. In addition, any rubber-like elastic material such as a rubber or a thermoplastic elastomer made of a highly polar main polymer may be used. As the main polymer, for example, CR (chloroprene rubber) can be used.
Further, the main polymer of the damping rubber material 20 may be EPDM (ethylene / propylene rubber) or IIR (butyl rubber) having low polarity. In this case, the rubber coating material 30 is preferably a rubber-like elastic body made of a low-polarity main polymer because of compatibility.

Then, the vibration damping rubber sheet 10 is integrated and extruded by an extrusion die when being extruded, and is vulcanized at a temperature of 150 ° C. or more in a subsequent vulcanizing furnace (not shown) to be elasticized. It becomes an integrated product that has a function as a body.
At this time, the damping rubber sheet 10 is placed on a conveyor belt and conveyed in the vulcanizing furnace, and the rubber coating material 30 covering the bottom surface of the damping rubber material 20 is placed on the conveyor belt. Although it is conveyed in a state where it is placed on a vulcanizer, even in an unvulcanized state when it is extruded and then enters a vulcanization furnace, the highly adhesive vibration damping rubber material 20 adheres to the conveyor belt and dirt is removed. Will not adhere.
Therefore, the conveyance belt is not damaged by the adhesion of the vibration damping rubber material 20, and the productivity is not reduced by being caught in the conveyance belt due to the adhesiveness.

Further, by covering the damping rubber material 20 with the rubber film material 30, deformation due to so-called sagging can be prevented, so that a desired shape can be obtained.
As shown in the lower part of FIG. 1, at the upper part of the rubber coating material 30 covering the left and right side surfaces 22 of the damping rubber material 20, the damping rubber material 20 slightly swells outward to the left and right. Since the material 20 is supported from below by the rubber film material 30, it is prevented from flowing down to the outside.

In the present embodiment, as shown in FIG. 2, the thickness of the rubber coating 20 is reduced to approximately ２ of the total height T obtained by adding the thickness M of the side surface 22 of the damping rubber material 20 to the thickness N of the rubber coating material 30. As shown in FIG. 3, the right and left side surfaces 22 of the damping rubber material 20 are entirely covered with the rubber coating material 30 by the height as shown in FIG. 3, or as shown in FIG. In addition, it is conceivable that the left and right side surfaces 22 that cover only the bottom surface 21 and the top surface 23 of the damping rubber material 20 are not covered.
However, in the case of FIG. 3, although it is excellent in fluidization measures such as preventing the damping rubber material 20 from sagging, there is a problem in the flatness of the upper surface of the damping rubber sheet 10, and in the case of FIG. Although there is a problem with the fluidization countermeasures on the left and right side surfaces 22, since the upper surface of the damping rubber sheet 10 is formed of the rubber film material 30, the upper surface of the damping rubber sheet 10 has excellent flatness. Is prevented from slightly bulging outward in the left and right directions shown on the lower side of FIG. 1 described above. As a countermeasure against fluidization of the damping rubber material 20 on the left and right side surfaces 22, the total height T obtained by adding the thickness N of the rubber film material 30 to the thickness M of the side surface 22 is not less than 1/4 and not more than 3/4. The effect is sufficient if the rubber coating material 30 is up.
In addition, it is conceivable that the rubber coating material 30 covers the entire circumference of the vibration damping rubber material 20, that is, the bottom surface 21, the left and right side surfaces 22, and the upper surface 23. In this case, gas generated from the inside during vulcanization molding is discharged to the outside. It cannot be adopted because air bubbles do not escape and remain inside.

From the above, the bottom surface 21 and the top surface 23 of the damping rubber material 20 are covered with the rubber film material 30, and the rubber film material 30 covering the bottom surface 21 is raised from the bottom surface 21 so that the left and right side surfaces 22 have a total height T of 3 mm. It is also possible to cover up to / 4 or less, or to lower the rubber coating material 30 covering the upper surface 23 from the upper surface 23 to cover the left and right side surfaces 22 from above to a length of 3/4 or less of the overall height T, In consideration of the problem that the damping rubber material 20 flows outward and damages the conveyor belt, it is preferable that the right and left side surfaces 22 are raised from the bottom surface 21 to cover the left and right side surfaces 22.
Further, the rubber coating material 30 can be covered along the left and right side surfaces 22 from both the bottom surface 21 and the upper surface 23 of the vibration damping rubber material 20 to cover a distance equal to or more than ４ of the total height T.

  Further, it is preferable that the thickness of the rubber coating material 30 is smaller than the thickness of the vibration damping rubber material 20. Further, when the thickness is more than 10% of the total height T, the portion of the vibration damping rubber material 20 is reduced to reduce the thickness. It is preferable that the height is set to 10% or less of the total height T because the vibration is greatly deteriorated.

REFERENCE SIGNS LIST 1 damping rubber sheet 10 damping rubber sheet 20 damping rubber material 21 bottom surface 22 side surface 23 top surface 30 rubber coating material M thickness of damping rubber material N thickness of rubber coating material T overall height of damping rubber sheet

Claims (4)

The whole bottom surface of the damping rubber material containing the resin is covered with a thinner rubber coating material having a JIS A hardness of 50 to 90 degrees, which is then vulcanized and integrated,
The rubber coating material covered the entire bottom surface of the vibration-damping rubber material and the side surface in a range of a distance equal to or more than １ ／ of the total height obtained by adding the thickness of the coating material to the thickness of the side surface of the vibration-damping rubber material. A method for producing a vibration damping rubber sheet. The whole bottom surface of the damping rubber material containing the resin is covered with a thinner rubber coating material having a JIS A hardness of 50 to 90 degrees, which is then vulcanized and integrated,
With the rubber coating material, the entire bottom surface of the vibration damping rubber material and the side surface within a distance equal to or less than 3/4 of the total height obtained by adding the thickness of the rubber coating material to the thickness of the side surface of the vibration damping rubber material. A method for producing a vibration-damping rubber sheet, which is covered. The whole bottom surface of the damping rubber material containing the resin is covered with a thinner rubber coating material having a JIS A hardness of 50 to 90 degrees, which is then vulcanized and integrated,
The method for manufacturing a vibration-damping rubber sheet, wherein the vibration-damping rubber material is NBR, and the rubber film material is one of NBR and CR .   The method for producing a vibration-damping rubber sheet according to any one of claims 1 to 3, wherein the thickness of the rubber coating material is set to 10% or less of the overall height.