JPH08209002A - Fusible vibration-damping resin for structural member, vibration-proof structural body and its production - Google Patents

Abstract

PURPOSE: To obtain the subject lightweight resin having high vibration-damping and sound insulation effects, excellent in workability, thus useful for the floor structural materials for vehicles or ships and for the floors or outer wall materials for buildings, comprising an asphalt, a synthetic rubber, a petroleum resin and a filler at specified proportions. CONSTITUTION: This resin comprises (A) 15-35wt.% of an asphalt, (B) 2-10wt.% of a synthetic rubber such as styrene-butadiene rubber, (C) 1-5wt.% of an aliphatic or aromatic petroleum resin, and (D) 50-75wt.% of a filler pref. composed of (i) 10-25wt.% of an inorganic lightweight aggregate, (ii) 35-50wt.% of a powdery filler, (iii) 3-8wt.% of a fibrous filter, and (iv) 2-5wt.% of quick lime. The objective structural body is obtained by bringing this resin into contact with a metallic structural body followed by heating to 100-250 deg.C to effect fusion bonding of the resin to the metallic structural body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-fusible damping resin for structural members used for floor structural materials of vehicles and ships, and floor and outer wall materials of buildings, vibration damping structures, and a manufacturing method thereof. Is.

[0002]

2. Description of the Related Art Floors of vehicles and ships, floors of some buildings,
As the outer wall metal material, a material such as iron or aluminum is generally used as a structural member. These materials have the advantage of high heat resistance, high mechanical strength, and high elastic modulus, but have the problem of resonance of sound or vibration noise peculiar to metal, and have the disadvantage of poor heat insulation performance compared to materials such as wood. There is.

Therefore, in recent years, various studies have been made to make a vibration damping structure so as to block outside sound and suppress vibration of the structural member itself to ensure habitability in the room.

That is, as a first method, a composite steel sheet having a viscous thin resin layer sandwiched between two metal plates made of, for example, iron, stainless steel, or aluminum is used as a material exhibiting good vibration damping performance. Focusing on the existence of constrained vibration-damping steel plates and non-constraint vibration-damping steel plates that consist of a vibration-damping composite in which a thick elastic resin sheet is attached to the back of a single metal plate, There is a method of combining to form a damping structure. As a second method, there is a method in which a damping resin is attached to the structure surface material to form a damping structure.

As a third method, there is a method of forming a vibration damping structure using a composition comprising vinyl chloride resin, a plasticizer, an epoxy resin and a foaming agent (JP-A-5-3299).
No. 73). As a fourth method, there is a method in which a thermosetting resin is coated with a vibration damping material containing a flaky inorganic substance to form a vibration damping structure (Japanese Patent Laid-Open No. 59-124843). Fifth
As a method of the above, there is a method of embedding a thermoplastic resin and a glass fiber cloth into a vibration damping structure (Japanese Patent Laid-Open No. 59-212).
249).

[0006]

However, when a vibration-damping steel plate is used as in the first method, there is a problem that it cannot be applied to an extruded shape member having a complicated shape. When the damping resin is attached to the structure surface material like the method, there is a problem that it is not possible to cope with the complicated unevenness of the structure surface material and there is a production constraint such as construction work being required later. . In particular, these problems become noticeable when applied to a long shaped material such as an extruded shaped material having a width of 1 m and a length of 5 m or more, further 20 m or more.

Further, when a foaming agent is used as in the third method, it is possible to follow the complicated irregularities of the base material (structure surface material) by foaming and increase the adhesiveness. But
The epoxy resin obtained by foaming and hardening the spacer layer has a drawback that the resin itself is hard and brittle. Then, if the curing is insufficient or the amount of the epoxy resin used is reduced, the resin becomes soft and the adhesiveness deteriorates, causing cohesive failure of the resin with the base material. Further, because of the spacer layer, if the positions of the metal constraining layer and the base material are too far apart, it becomes difficult for the damping layer to exert sufficient damping properties. Furthermore, in order to form a foam layer with a uniform thickness, it is necessary to use a certain amount of aluminum foil for the protective layer, so it is practically difficult to process it into a complicated structure or curved surface, Since the obtained material has a multi-layered structure, the problem of low productivity remains.

Further, when the thermosetting resin is coated with the vibration damping agent containing the flaky inorganic substance as in the fourth method, there are the following problems. That is, a thermosetting resin such as an unsaturated polyester resin or an epoxy resin is used for the resin composition, but it is important to have a structure in which scaly inorganic substances are stacked in the same direction in order to exhibit vibration damping property. It is also a requirement that the resin be a liquid substance having a low viscosity. Therefore,
In the fourth method, since it is necessary to coat by a spray method or the like, it is difficult to apply it uniformly to a narrow space of a long extruded frame. In addition, there is a problem that it is technically difficult to obtain sufficient vibration damping property because unevenness occurs in the thickness of the vibration damping resin layer when foamed. Further, in order to uniformly disperse the flaky inorganic substance, it is necessary to suppress the foaming rate to a low level, and there is a problem that the heat insulating property becomes insufficient. Further, in the method of embedding the thermoplastic resin and the glass fiber cloth like the fifth method, there is a problem that the vibration damping performance becomes insufficient because the elastic modulus of the resin itself is low.

As described above, the conventional method has a problem that it is difficult to form a damping structure having a complicated shape or a long shape so as to have sufficient damping performance. Therefore, in the present invention, a heat-fusion property for a structural member that can be easily applied to a metal structure having a complicated shape or a long shape, and that can form a vibration damping structure having good vibration damping performance. A first object is to provide a damping resin, a damping structure, and a method for manufacturing the same.

Further, in order to apply the structural member to a structure for a high-speed vehicle, it is required that the density is less than 1.7 g / cm ³ , preferably 1.5 g / cm ³ or less. In the structural members formed by the above first to fifth methods, since the resin material is heavy, 1.7 to 1.8 g / cm
^{It has} a density of ³ . Therefore, the second object of the present invention is to provide a heat-fusible damping resin for structural members, which can further reduce the density of the damping structure.

[0011]

In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that the heat-fusible damping resin for structural members comprises 15 to 35% by weight of asphalt and 2 to 5% of synthetic rubber.
10 wt%, petroleum resin 1-5 wt%, filler 50-
It is characterized in that the content is 75% by weight.

According to a second aspect of the present invention, the heat-fusible damping resin for structural members comprises asphalt of 15 to 35% by weight, synthetic rubber of 2 to 10% by weight, petroleum resin of 1 to 5% by weight, and filler. Is contained in a mixing ratio of 50 to 75% by weight, and one or more coating layers laminated on the first layer and made of at least one kind of thermoplastic resin. .

According to a third aspect of the present invention, the filler of the heat fusible damping resin for a structural member according to the first or second aspect is 10 to 25% by weight of an inorganic lightweight aggregate, and a powdery filler. 3
It is characterized by containing 5 to 50% by weight, a fibrous filler in an amount of 3 to 8% by weight, and quick lime in an amount of 2 to 5% by weight.

The invention of claim 4 is the invention of claim 1, 2 or 3.
Any one of the heat-fusible damping resin for structural members described above is characterized in that it is formed into a long sheet having a width of 1 m or less and a length of 5 m or more.

According to a fifth aspect of the present invention, there is provided a vibration damping structure in which the heat fusible damping resin for a structural member according to any one of the first to fourth aspects is heat fused to a metal structure by heating. It has a feature.

According to a sixth aspect of the present invention, the heat-fusible damping resin for structural member according to any one of the first to fourth aspects is heated to 100 to 250 ° C. in a state of being bonded to the metal structure, and the metal structure is heated. It is characterized in that it is heat-fused to the body to form a damping structure.

[0017]

[Function] First, the heat-fusible damping resin for structural members (hereinafter,
The role of each composition (referred to as a damping resin) is as follows.

That is, the reason for including asphalt is
This is to impart elasticity and tensile strength to the heat-fusible damping resin for structural members. Further, the reason why the synthetic rubber is contained is to obtain the necessary vibration damping performance by imparting sufficient elasticity to the heat-fusible vibration damping resin for structural members.
Further, the reason why the petroleum resin is contained is to make the damping resin exhibit tackiness. Also, the reason for including the filler is to maintain the shape of the heat-fusible damping resin for structural members,
This is for exhibiting heat insulation.

As a result, the damping resin composed of the above composition has self-welding properties such that it melts at the time of heating and flows into the complicated irregularities of the metal structure and adheres to the metal structure. Sufficient damping performance (loss coefficient at 20 ° C is 0.05 or more) is given to the damping structure,
Further, by obtaining high flexibility, the winding property is improved, and the tensile strength is also improved, so that it has excellent workability for a long mold material. And
The vibration-damping resin with excellent tensile strength has a width of 1 m.
Hereafter, by being formed into a long sheet having a length of 5 m or more, the insertability into the hollow portion of the vibration damping structure and the workability are improved. Further, when the thermoplastic resin film is laminated and adhered to the sheet-shaped damping resin, the slipperiness is improved, and the insertability into the hollow portion of the damping structure and the workability are further improved.

Next, each composition of the heat-fusible damping resin for structural members was treated with asphalt: 15 to 35% by weight, synthetic rubber: 2 to 10% by weight, filler: 50 to 75% by weight, petroleum resin. The reason for setting 1 to 5% by weight is as follows.

That is, the reason why the asphalt content is in the range of 15 to 35% by weight is that if it is less than 15% by weight, the elastic modulus of the damping resin becomes insufficient and the damping performance cannot be obtained. This is because there is a problem that the handling property that a solid substance is melted and used at the time of heating at room temperature is deteriorated, and further the heat resistance is deteriorated. On the other hand, if it exceeds 35% by weight, the tensile strength of the vibration damping resin is lowered and the workability is deteriorated.

The reason why the synthetic rubber content is in the range of 2 to 10% by weight is that if it is less than 2% by weight, sufficient elasticity cannot be imparted to the damping resin and the required damping performance cannot be obtained. .
On the other hand, if it exceeds 10% by weight, the tensile strength of the vibration-damping resin is lowered and the workability is deteriorated.

The reason why the petroleum resin content is 1 to 5% by weight is 1
If it is less than 5% by weight, the tensile strength of the damping resin may be insufficient and the damping resin may be broken during construction. If it is more than 5% by weight, the flexibility may be insufficient and the damping resin may have poor workability and workability. This is because there is a possibility that satisfactory vibration damping performance may not be obtained due to a decrease in workability and lack of elasticity.

The reason why the content of the filler is in the range of 50 to 75% by weight is that if it is less than 50% by weight, problems such as difficulty in maintaining the shape during heat fusion occur, and if it exceeds 75% by weight, This is because the weight is increased more than necessary and the heat insulating property is not sufficiently exhibited.

Further, the blending ratio of the filler is such that the inorganic lightweight aggregate 1
0 to 25% by weight, powdered filler 35 to 50% by weight, fibrous filler 3 to 8% by weight, and quick lime 2 to 5% by weight are particularly low in specific gravity and light in weight, and in addition to the heat insulating property. This is to realize an excellent damping resin.

Here, 10 to 25% by weight of the inorganic lightweight aggregate is used.
The reason why the range is set is that if it is less than 10% by weight, the weight reduction cannot be sufficiently realized, and if it exceeds 25% by weight, the vibration damping property deteriorates. The reason why the powder filler is set in the range of 35 to 50% by weight is that when it is less than 35% by weight, the shape cannot be maintained and the workability is lowered when the damping resin is processed into a sheet, and the weight reduction is 50% by weight. If it exceeds, there is a possibility that the weight reduction becomes insufficient. The reason for setting the fibrous filler in the range of 3 to 8% by weight is that if it is less than 3% by weight, the strength of the vibration damping resin may be reduced and the workability may be deteriorated. This is because the sex is reduced. 2 to quicklime
The reason for setting the range of 5% by weight is that it is less than 2% by weight.
This is because swelling may occur during heat fusion of the damping resin, and if it exceeds 5% by weight, the effect does not change even if the compounding amount is increased, which is disadvantageous in terms of cost.

Next, each composition of the heat-fusible damping resin for structural members will be described more specifically. Those that can be used for asphalt include natural asphalt and petroleum asphalt. Examples of petroleum asphalt include straight asphalt, blown asphalt, semi-blown asphalt, and rubber-modified asphalt. These asphalts can be used alone or as a mixture of several kinds.

The synthetic rubbers that can be used include butyl rubber, styrene rubber, chloroprene rubber and styrene.
Butadiene rubber and the like can be mentioned. Particularly, it is preferable to use styrene-butadiene rubber, but it is also possible to use several kinds of rubber together. In addition, if necessary, as a rubber-like substance, a polybutadiene-based thermoplastic elastomer containing 90% by weight or more of 1,2-bonds, a liquid rubber in which a carboxyl group or an amino group is chemically modified in a terminal group, styrene / acrylic rubber, or the like is used. It can also be used.

Examples of fillers that can be used include powder fillers, fibrous fillers, flaky fillers, and lightweight aggregates. Examples of the powdery filler include barium sulfate, calcium carbonate, zinc dust, zinc white, clay and the like. Examples of the fibrous filler include natural and unwoven fibers from scientific fibers, paper fibers from crushed waste paper, mineral fibers from glass wool, slag wool and the like. As the flaky filler,
Examples thereof include mica and mica. Examples of the lightweight aggregate include lightweight aggregates made of minerals such as silica-based lightweight aggregates and shirasu-based lightweight aggregates, for example, bubble-containing pigments having bubbles inside the minerals. In addition, a lightweight aggregate such as an inorganic balloon having a hollow interior by processing a silica-based or shirasu-based inorganic material can also be used. Further, examples of the organic lightweight aggregate include copolymers of methyl acrylate, ethyl acrylate, methyl methacrylate, acrylonitrile, and acrylic plastic balloons copolymerized with vinyl acetate, vinyl chloride styrene, and the like.

The petroleum resin that can be used is an aliphatic petroleum resin, an aromatic petroleum resin, a copolymer resin obtained by using both of them as a raw material, or a urethane resin which can be similarly used in addition to the petroleum resin. Starting with thermoplastic elastomers such as thermoplastic elastomers, vinyl chloride, methacrylic acid and ester derivatives, acrylic acid and ester derivatives, vinyl acetate, fumaric acid, maleic acid, itaconic acid, vinylidene chloride homopolymers or copolymers, Or there is a mixture of these.

In addition, if necessary, various additives can be added to the above composition. Examples of the additive include an ultraviolet absorber, an antioxidant and a dispersant.

Next, a method of manufacturing the damping resin will be described. The vibration damping resin containing the above-mentioned material (composition) can be produced by a conventionally known method. That is, it can be produced by mixing and dispersing the filler into the asphalt melted by an appropriate heating means and stirring the mixture. For mixing and dispersing, a dispersing machine such as a vacuum kneader, an open kneader, various mixers such as a planetary mixer, and various mills such as a ball mill can be used.

Thereafter, the vibration-damping resin composed of the blended and dispersed mixture is rolled into a sheet-shaped vibration-damping resin sheet as shown in FIG. 2 by a rolling means such as a two-roll roll, a three-roll roll or a calender roll. It is processed into 1 and cut into an arbitrary shape and size. The damping resin may be three-dimensionally molded according to the shape of the metal structure to be heat-sealed. However, in the case of three-dimensional molding, it is preferable to cold press because the heat insulating and damping material has temperature sensitivity.

For the metal structure to which the damping resin is heated and fused, metals widely used in the industrial field such as iron, aluminum, stainless steel, copper, titanium, and alloys thereof can be used. The metal structure is preferably in a state in which the oil content on the surface is removed, but this is not an essential condition. For example, a metal structure (pre-coated metal) coated with a suitable synthetic resin paint, a chemical conversion treatment, an electric treatment, or the like. It may be a metal structure having a coated surface.

Next, the reason why the vibration-damping resin sheet 1 having the above structure is used as the first layer, and the first layer is provided with one or more coating layers made of at least one kind of thermoplastic resin is as follows. The damping property of the damping resin against the metal structure is increased to further improve workability (especially for long structures), and the damping resin has good characteristics at low temperatures (damping effect and cold shock resistance). This is because it is possible to easily obtain a vibration damping structure having more excellent performance.

A concrete example of the vibration damping resin composed of a plurality of layers is shown in FIG.
10-40μ of hot melt adhesive 2 (second layer)
There is one in which the thermoplastic resin film 3 (third layer) is laminated and adhered while it is applied with a film thickness of 1 and has an adhesive ability.

Here, the hot melt adhesive 2 is mainly composed of a thermoplastic synthetic resin, to which waxes, plasticizers, tackifiers, antioxidants, fillers and the like as modifiers are appropriately mixed. It is an adhesive with a solid content of 100% and is heated to a temperature at which it can be applied by a dedicated applicator and applied, but it solidifies when cooled to room temperature.

The film thickness of the hot melt adhesive 2 is 10-4.
The range of 0 μ is desirable. This is because if the coating film is less than 10 μm, sufficient adhesive ability cannot be obtained, while if it exceeds 40 μm, the adhesive strength does not change even if it is applied with a further coating film,
This is because the vibration damping performance is deteriorated.

As the thermoplastic resin film 3, a film made of polyester, polyethylene, polystyrene, polyurethane, vinyl chloride, vinyl oxide, or a copolymer of these can be used. The film thickness of the film is preferably 20 to 50 μm. This is because the cold shock resistance is not sufficient for a film having a thickness of less than 20 μ,
This is because a film having a thickness of more than 50μ will have reduced vibration damping properties.

Further, instead of using the hot melt adhesive 2 and the thermoplastic resin film 3 described above, as shown in FIG. 4, only the thermoplastic film 3 may be mechanically adhered to the damping resin 1. Alternatively, it may be adhered to the vibration damping resin 1 at a heating temperature at which the thermoplastic film 3 becomes tacky. Further, only the hot melt adhesive 2 may be adhered to the damping resin 1. That is, when the damping resin 1 is used as the first layer, one or more coating layers such as the hot melt adhesive 2 and the thermoplastic resin film 3 made of at least one kind of thermoplastic resin are laminated on the first layer. It should be done.

The damping resin 1 and the thermoplastic resin film 3 are used.
By being attached, it becomes a damping resin having a certain degree of heat insulation performance, but it is also effective to further enhance the heat insulation performance by adding a foaming agent to foam.
As for the foaming method, known materials and methods can be applied.

Next, a method of manufacturing the vibration damping structure will be described. As shown in FIG. 1, the vibration damping resin is formed into a size and shape corresponding to the space of the extrusion molded body 4 (metal structure) by cutting or the like, whereby a vibration damping resin sheet is obtained. Then, this damping resin sheet is inserted into the space of the extrusion molded body 4 and is inserted while being pulled.

Next, if the surface of the extruded body 4 to which the damping resin is attached is a flat surface or an inclined surface with an extremely gentle angle, the desired position on these surfaces is controlled. A vibration resin sheet can be placed. On the other hand, extruded body 4
If the sticking surface of is a slanted surface or a vertical surface, the vibration-damping resin sheet is temporarily fixed by a conventionally known method such as a pressure-reducing adhesive, clips, screws, or double-sided adhesive tape. .

After that, the extrusion molded body 4 is heat-treated at 100 to 250 ° C. with the damping resin sheet inserted therein. Then, the damping resin sheet is melted by heating and heat-bonded to the bonding surface of the extrusion molded body 4, whereby the damping structure 6 having the damping resin 5 bonded thereto is manufactured. At this time, the heating time is preferably in the range of 30 minutes to 2 hours, but is not particularly limited.

It should be noted that the heating temperature is 100 to 25 as described above.
The reason for setting the temperature range to 0 ° C. is that if the temperature is lower than 100 ° C., the damping resin will be insufficiently melted and the adhesiveness will be poor. On the other hand, when the temperature exceeds 250 ° C., it is necessary to finish the heat treatment in a short time so as not to cause the resin deterioration due to thermal decomposition, and this is not practically applicable to the large extrusion molded body 4.

As the heat treatment, conventionally known electric heating furnaces, gas heating furnaces, and other heating means can be used, and the heat discharged during the heating and drying of the baking type paint using a thermosetting resin can be used. It may be used.

[0047]

EXAMPLES The following examples are provided for a more detailed understanding of the present invention. Naturally, the invention is not limited to the following examples.

Example 1 As shown in Table 1, 32 wt% of blown asphalt was melted by heating as asphalt, and 10 wt% of styrene-butadiene rubber as synthetic rubber and 5 wt% of petroleum resin were added thereto. And then
40% by weight of calcium carbonate, 8% by weight of crushed waste paper and 5% by weight of quick lime were added as a filler and mixed and dispersed by a vacuum kneader to obtain a damping resin. Then, this damping resin is processed into a sheet having a thickness of about 2 mm by a calender roll, placed on an aluminum alloy plate for railway vehicle structure, and heated at 170 ° C. for 40 minutes, whereby the damping resin is A vibration damping structure completely heat-sealed to an aluminum alloy plate was obtained.

[0049]

[Table 1]

Next, the above damping resin was processed into a sheet and wound into a roll having a width of 10 m and a length of 100 m. Then, the vibration-damping resin sheet pulled out from the roll end is an extruded body 4 which is an extruded aluminum mold member having a length of about 25 m and a width of about 5 m shown in FIG. 1 (a contact interval between the pillar and the pillar mold member is about 16 cm, Height about 7 mm, wall thickness of mold material about 2
It was confirmed that it could be properly inserted into this space when it was pushed into the space of (mm) and pulled by the guide rod passed from the opposite side. In addition, it was confirmed that when the damping resin of Comparative Example 7 described later was similarly formed into a sheet shape and pulled by a guide rod, the sheet was cut and the construction became impossible.

Next, regarding the above-mentioned vibration control structure, JIS
An adiabatic test was conducted according to R1611 (laser flash method), and heat transfer (W / m · K) was measured. The heat transfer property indicates the ease with which heat is transferred, and the smaller the number, the higher the heat insulating property.

After that, a vibration damping test was conducted. Specifically, the loss coefficient μ at each temperature of 20 ° C., 40 ° C., and 60 ° C. was measured by the resonance method. The larger the loss coefficient μ is, the higher the damping effect is, and when the loss coefficient is 0.05 or more, the damping effect is considered to be effective. Next, the flexibility, specific gravity and cold shock resistance were measured, and the measurement results are shown in Table 2. The flexibility was measured by placing the vibration damping material (50 × 200 mm) in a thermo-hygrostat and leaving it at each predetermined temperature for 2 hours or more, and then immediately after removing it from the thermo-hygrostat as shown in FIG. φ1
It was performed by visually observing the fractured state of the damping material 12 when wound around a 0 mm steel rod 11. If there is no breakage or other abnormalities in the range of -20 to 40 ° C, “⊚”, and if there is no breakage or other abnormalities in the range of 0 to 30 ° C, “◯”, 5 to 25 ° C. When there was no breakage or other abnormality in the range, it was judged as "△". In addition, cold shock resistance is measured using an aluminum plate (150 x 200 x
Immediately after taking out the vibration damping material (100 x 50 x 3 mm) from 2 mm) into a test piece, placing it in a thermo-hygrostat for 2 hours or more and leaving it for 2 hours or more, immediately after removing it from the thermo-hygrostat. In addition, as shown in FIG. 6, the degree of peeling and floating of the test piece 14 when a steel ball drop test in which 50 g of the steel ball 13 was dropped from 300 mm above was performed was visually determined. Then, when there was no peeling up to −20 ° C., it was judged as “⊚”, when there was no peeling up to 0 ° C., it was judged as “◯”, and when there was no peeling up to 10 ° C., it was judged as “Δ”. The specific gravity was measured by the water replacement method.

Example 2 As shown in Table 1, 32% by weight of blown asphalt was melted by heating as asphalt, and 10% by weight of styrene-butadiene rubber as synthetic rubber and 5% by weight of petroleum resin were added thereto. Then, 10% by weight of silica-based lightweight aggregate, 30% by weight of calcium carbonate, 8% by weight of crushed waste paper and 5% by weight of quick lime were added as a filler, and mixed and dispersed by a vacuum kneader to obtain a damping resin. . Then, this damping resin is processed into a sheet having a thickness of about 2 mm by a calender roll, placed on an aluminum alloy plate for railway vehicle structure, and heated at 170 ° C. for 40 minutes, whereby the damping resin is A vibration damping structure completely heat-sealed to an aluminum alloy plate was obtained.

Thereafter, in the same manner as in Example 1, the vibration damping structure was subjected to a heat insulating test and a vibration damping test in accordance with JIS R1611, and the flexibility, specific gravity and cold shock resistance were measured. The results of these measurements are shown in Table 2.

Example 3 A polyethylene resin film having a thickness of 50 μ was laminated and adhered to one surface of the sheet-shaped resin obtained in Example 2 and placed on an aluminum alloy plate for railway vehicle structure. Then, by heating at 170 ° C. for 40 minutes, a damping structure in which the damping resin was completely heat-sealed to the aluminum alloy plate was obtained.

Thereafter, in the same manner as in Example 1, the heat insulating structure and the vibration damping test according to JIS R1611 were conducted on the above-mentioned vibration damping structure, and the flexibility, the specific gravity and the cold shock resistance were measured. The results of these measurements are shown in Table 2.

Example 4 As shown in Table 1, 32 wt% of blown asphalt was melted by heating as asphalt, and 10 wt% of styrene-butadiene rubber as synthetic rubber and 5 wt% of petroleum resin were added thereto. Then, 10% by weight of a silica-based lightweight aggregate, 30% by weight of calcium carbonate, 8% by weight of crushed waste paper and 5% by weight of quick lime were added as a filler, and mixed and dispersed by a vacuum kneader to obtain a damping resin. . Then, this damping resin is processed into a sheet having a thickness of about 2 mm by a calender roll to form a first layer, and further, the damping resin of the first layer is hot-melt bonded with ethylene vinyl acetate having a thickness of 30 μm. The agent was laminated and adhered as the second layer. Then, the vibration damping resin was placed on an aluminum alloy plate for a railway vehicle structure and heated at 170 ° C. for 40 minutes to obtain a vibration damping structure in which the damping resin was completely heat-sealed to the aluminum alloy plate.

Thereafter, in the same manner as in Example 1, the vibration damping structure was subjected to a heat insulating property test and a vibration damping property test according to JIS R1611, and the flexibility, specific gravity and cold shock resistance were measured. The results of these measurements are shown in Table 2.

Example 5 As shown in Table 1, 32 wt% of blown asphalt was melted by heating as asphalt, and 10 wt% of styrene-butadiene rubber as synthetic rubber and 5 wt% of petroleum resin were added thereto. Then, 10% by weight of silica-based lightweight aggregate, 30% by weight of calcium carbonate, 8% by weight of crushed waste paper and 5% by weight of quick lime were added as a filler, and mixed and dispersed by a vacuum kneader to obtain a damping resin. . Then, this damping resin was processed into a first layer with a calender roll into a sheet having a thickness of about 2 mm, and hot damping adhesive composed of ethylene vinyl acetate having a thickness of 30 μm was applied to the damping resin of the first layer. The agent was laminated and adhered as a second layer, and a polyethylene resin film having a thickness of 50 μm was laminated and adhered as a third layer. After this,
Placed on an aluminum alloy plate for railway vehicle structure, 4 at 170 ℃
By heating for 0 minutes, a damping structure in which the damping resin was completely heat-sealed to the aluminum alloy plate was obtained.

Thereafter, in the same manner as in Example 1, the heat insulating structure and the vibration damping test according to JIS R1611 were performed on the above-mentioned vibration damping structure, and the flexibility, the specific gravity and the cold shock resistance were measured. The results of these measurements are shown in Table 2.

[Comparative Examples 1 to 9] The compositions were weighed so as to have the compounding ratios shown in Table 1, and mixed and dispersed by a vacuum kneader to obtain damping resins, respectively. Then, each of these damping resins is calendered to a thickness of about 2 m.
After being processed into a m-shaped sheet, it is placed on an aluminum alloy plate for railway vehicle structure and heated at 170 ° C for 40 minutes, so that the damping resin is completely heat-sealed to the aluminum alloy plate. Got the body

Thereafter, in the same manner as in Example 1, the above damping structure was subjected to a heat insulating test and a vibration damping test in accordance with JIS R1611, and at the same time, the specific gravity and cold shock resistance were measured. The results are shown in Table 2.

[0063]

[Table 2]

From the above measurement results, as in Examples 1 to 5, the damping resin is 15 to 35% by weight of asphalt, 2 to 10% by weight of synthetic rubber, 1 to 5% by weight of petroleum resin, and the filler. It has been revealed that a damping resin having excellent characteristics such as flexibility and tensile strength can be obtained by containing 50% by weight to 75% by weight.

Further, in the first and second embodiments,
Since the specific gravity of the damping resin is 1.6 in Example 1 and 1.5 in Example 2, it is clear that the specific gravity can be reduced by using the silica-based lightweight aggregate as the filler. Became.

In the second and third embodiments,
While the cold shock resistance of the damping resin is “◯” in Example 2, it is “⊚” in Example 3, and the loss coefficient of Example 3 is larger than the loss coefficient of Example 2. From the results, it was revealed that the cold shock resistance and the vibration damping effect can be further improved by laminating and bonding the polyethylene resin film on the vibration damping resin. Further, in Example 4, it was confirmed that the flexibility, the impact resistance against cold, and the vibration damping property were improved by only hot melt. In addition, in Example 5, it was confirmed that the above effect was improved even when the hot melt and the PE film were laminated.

[0067]

The heat-fusible damping resin for structural members according to the invention of claim 1 comprises 15 to 35% by weight of asphalt, 2 to 10% by weight of synthetic rubber, and 1 to 5% by weight of petroleum resin, By containing the filler in a mixing ratio of 50 to 75% by weight, it has extremely excellent tensile strength, and also has flexible physical properties, and can be easily applied to a metal structure having a complicated shape or a long shape, Moreover, it is possible to form a vibration damping structure having good vibration damping performance. Further, since it is lightweight and has a low specific gravity, it is possible to contribute to the weight reduction of the power machine and the transportation machine as a whole, and to contribute to fuel saving and resource saving.

The heat-fusible damping resin for structural members according to the second aspect of the invention is filled with 15 to 35% by weight of asphalt, 2 to 10% by weight of synthetic rubber, and 1 to 5% by weight of petroleum resin. Since it is provided with a first layer containing the material in a mixing ratio of 50 to 75% by weight and one or more coating layers laminated on the first layer and made of at least one kind of thermoplastic resin, The vibration damping effect and the cold shock resistance are further improved, and it is possible to obtain a structure having more excellent performance.

Further, in the heat-fusible damping resin for structural members according to claim 3, the filler is 10 to 25% by weight of the inorganic lightweight aggregate, 35 to 50% by weight of the powdery filler, and the fibrous filler. Material 3
Since it contains -8% by weight and quick lime in a mixing ratio of 2-5% by weight, it is possible to obtain a resin having a low specific gravity and a light weight and excellent heat insulating properties.

Since the heat-fusible damping resin for structural members according to claim 4 is formed into a long sheet having a width of 1 m or less and a length of 5 m or more, it has a long shape. This has the effect of facilitating construction on materials and the like.

The damping structure according to claim 5 is the vibration damping structure according to claim 1.
The heat-fusible damping resin for a structural member according to any one of 1 to 4 is heat-fused to a metal structure by heating, and therefore exhibits good vibration damping and sound insulating properties, and further, is lightweight and has a low specific gravity. Since the heat-fusible damping resin for structural members is heat-fused, the vibration-damping structure itself is also lighter, resulting in a reduction in the weight of power machinery and transportation equipment, and in turn, fuel efficiency. It also has the effect of enabling resource saving.

Further, in the method for manufacturing the vibration damping structure according to the sixth aspect, the heat-fusible damping resin for structural members is heated to 100 to 250 ° C. in a state of being bonded to the metal structure to form a metal structure. By heat-sealing the vibration-damping structure, the vibration-damping resin is sufficiently melted and heat-sealed while preventing thermal deterioration, and good adhesion and vibration-damping to the vibration-damping structure are achieved. The effect of being able to exert the effect is exhibited.

[Brief description of drawings]

FIG. 1 is a front view of a main part in which a damping resin is heat-sealed to a damping mold material.

FIG. 2 is a front view of a main portion of a vibration damping resin to which a thermoplastic resin film is attached via a hot melt adhesive.

FIG. 3 is a front view of a main part of a vibration damping resin to which a thermoplastic resin film is attached.

FIG. 4 is a perspective view of an extruded body on which a damping resin is heat-sealed.

FIG. 5 is an explanatory diagram showing a method of measuring flexibility.

FIG. 6 is an explanatory diagram showing a method of measuring cold shock resistance.

[Explanation of symbols]

 1 damping resin sheet 2 hot melt adhesive 3 thermoplastic resin film 4 extrusion molded body 5 damping resin 6 damping structure

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C08K 3/00 3/22 7/02 C08L 21/00 LBV (72) Inventor Noriaki Yasumoto Tokyo 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Incorporated company Kobe Steel, Ltd. Tokyo headquarters (72) Inventor Toshimitsu Tanaka 1-5-5, Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Kobe Steel Works, Ltd. 72) Inventor Akio Sugimoto 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Kobe Steel Research Institute, Kobe Research Institute (72) Inventor Toshihiko Sasaki 14-1 Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Kobe Steel, Ltd. (72) Inventor Hiromichi Okumura 4- 1-3 Bingo-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Kobe Works, Ltd. Osaka Branch Office (72) Inventor Manabu Shibata Kyoto Kita Toshima 8-chome 16th No. 15 Nippon special paint Co., Ltd. soundproofing material in the division (72) inventor Naofumi Itano Kita-ku, Tokyo Toshima 8-chome 16th No. 15 Nippon special paint Co., Ltd. soundproofing material in the Division

Claims (6)

[Claims] 1. A heat-melting structural member containing 15 to 35% by weight of asphalt, 2 to 10% by weight of synthetic rubber, 1 to 5% by weight of petroleum resin, and 50 to 75% by weight of a filler. Adhesive damping resin. 2. A first layer containing 15-35% by weight of asphalt, 2-10% by weight of synthetic rubber, 1-5% by weight of petroleum resin, and 50-75% by weight of filler. A heat-fusible damping resin for structural members, which is laminated on the first layer and has one or more coating layers made of at least one thermoplastic resin. 3. The filler is made of inorganic lightweight aggregate 10-2.
5% by weight, a powdery filler in an amount of 35 to 50% by weight, a fibrous filler in an amount of 3 to 8% by weight, and quick lime in an amount of 2 to 5% by weight. 2. The heat-fusible damping resin for a structural member according to any one of 2 above. 4. The heat fusible control for a structural member according to claim 1, wherein the sheet is formed into a long sheet having a width of 1 m or less and a length of 5 m or more. Shake resin. 5. A vibration damping structure, wherein the heat fusible damping resin for a structural member according to claim 1 is heat fused to a metal structure by heating. 6. The heat-fusible damping resin for a structural member according to claim 1, which is bonded to a metal structure, is heated to 100 to 250 ° C., and heat-bonded to the metal structure. A method for manufacturing a vibration damping structure, which comprises forming a vibration damping structure.