KR102157191B1 - Elastomeric composite structure and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an elastic composite structure that supports structures such as bridges and buildings, and is inserted into the floor or the middle of the structure to withstand horizontal loads such as typhoons and earthquakes, and a method of manufacturing the same.

Description

Elastic composite structure and its manufacturing method {ELASTOMERIC COMPOSITE STRUCTURE AND MANUFACTURING METHOD THEREOF}

The present invention relates to an elastic composite structure that supports structures such as bridges and buildings, and is inserted into the floor or the middle of the structure to withstand horizontal loads such as typhoons and earthquakes, and a method of manufacturing the same.

In general, in special structures such as bridges, tunnels, high-rise buildings, nuclear power plants, and plants, elastic bearings are widely used for the purpose of reducing the force received by the lower structure by supporting the vertical load of the structure and performing a buffer function. .

In the conventional elastic bearing, a rubber material was used to disperse the impact of shear force and stress generated by the structure and to accommodate the behavior caused by the deformation of the structure, and to prevent excessive lateral expansion of the rubber material and to improve the strength. An iron plate was used together as a reinforcing material. However, the steel plate increases fatigue when used for a long period of time, and is destroyed due to corrosion due to climatic conditions and bending due to impact, so that its life is short, and the elastic support is excessively weighted due to the steel plate, so that the elastic support is transported, replaced, and When supplementing, there is a problem that workability is significantly deteriorated.

In order to solve the problem of excessive weight of the steel plate, a technology for replacing the reinforcing material of the elastic support with epoxy resin is being actively developed, but the epoxy is a thermosetting resin, which increases the manufacturing time and cost due to crosslinking, and the generation of fragments during the process. There is a problem that the workability is decreased due to the increase, the supply of demand is not smooth, and long-term storage is difficult. Accordingly, development of a technology capable of replacing the thermosetting resin with a thermoplastic resin has been actively made.

As a seismic isolation design for earthquakes, an elastic bearing is used as a buffer between the structure and the ground to prevent seismic waves from propagating to the structure by separating the structure and the ground. However, when used for a long period, the adhesion between the rubber and the reinforcing material in the elastic bearing is difficult. There is a problem that cannot be maintained and falls off. In order to prevent this, an epoxy resin adhesive is applied to the surface of the conventional epoxy resin reinforcement material, but the elastic support including the epoxy adhesive is not sufficiently strong and durable, so fracture due to external impact easily occurs and the seismic isolation performance is also low. It is a situation that needs to be supplemented.

In order to solve the above problems, the present invention provides an integrated composite prepreg by laminating at least two layers of prepreg produced by thermally impregnating at least two mats selected from a glass fiber mat and a carbon fiber mat with a polyamide resin. Core structure including; A rubber layer formed by surrounding the outer portion of the core structure with rubber; And a cresol-based resin adhesive layer comprising elastic particles formed at the interface between the core structure and the rubber layer; thereby having excellent mechanical properties, impact resistance, and abrasion resistance, and improving work efficiency due to weight reduction It is an object of the present invention to provide an elastic composite structure for support.

In addition, the present invention uses a composite prepreg in which two or more layers of a glass fiber prepreg, a carbon fiber prepreg, and a mixed prepreg thereof are laminated as a core structure by heat impregnation with a thermoplastic polyamide resin, so that storage is easy. It is an object of the present invention to provide an elastic composite structure using a thermoplastic resin capable of reusing prepreg residues generated during processing.

In addition, an object of the present invention is to provide an elastic composite structure capable of preventing the peeling between the core structure and the rubber layer, bending of the elastic composite structure for an elastic support in a specific direction, and breaking due to external impact.

In order to achieve the above object, the elastic composite structure of the present invention is an integrated composite prepreg by laminating at least two or more prepregs produced by thermally impregnating a polyamide resin on at least one mat selected from a glass fiber mat and a carbon fiber mat. A core structure including a leg; A rubber layer formed by surrounding the outer portion of the core structure with rubber; And a cresol-based resin adhesive layer including elastic particles formed at the interface between the core structure and the rubber layer.

In one aspect of the present invention, the adhesive layer may contain 1 to 60 parts by weight of elastic particles based on 100 parts by weight of the cresol-based resin.

In one aspect of the present invention, the elastic particles may be rubber or elastomer powder having an average particle diameter of 10 to 300 μm.

In one aspect of the present invention, the elastic composite structure may have at least two or more core structures spaced apart in the rubber layer.

In one aspect of the present invention, the composite prepreg may further include a reinforcing material.

In one aspect of the present invention, the reinforcing material may be a long fiber or a fiber woven in a mesh form.

The manufacturing method of the elastic composite structure of the present invention is: a) At least two layers of prepreg prepared by extruding a polyamide resin at high temperature and thermally impregnating at least one mat selected from a glass fiber mat and a carbon fiber mat are laminated and heated. And a core structure manufacturing step of manufacturing a composite prepreg by pressing. b) applying and drying a cresol-based resin solution containing elastic particles on the surface of the composite prepreg; And c) laminating rubber sheets on both sides of the core structure, heating and pressing, and then wrapping the outer portion of the core structure with a rubber layer to be integrated.

In another aspect of the present invention, step c) may be a step of alternately stacking the core structure and the rubber sheet, wrapping the outer part with a rubber layer, and then heating and compressing the core structure to be integrated.

The elastic composite structure according to the present invention has excellent mechanical properties, impact resistance, abrasion resistance, flexural strain and flexural modulus, and has the advantage of improving work efficiency due to weight reduction.

In addition, the elastic composite structure according to the present invention is easy to store by using a prepreg manufactured by thermally impregnating a polyamide resin as a core structure, and the prepreg residue generated during processing can be reused, and mass production is possible. .

In addition, compared to the conventional prepreg having a limited size of the prepreg produced by laminating a thermosetting resin and glass fiber or carbon fiber to manufacture the prepreg, the prepreg according to the present invention uses a thermoplastic polyamide as a matrix resin. By doing so, it is possible to easily manufacture prepregs of various sizes, and there is an advantage that it is possible to supplement the core structure manufactured by using the prepregs.

In addition, since the elastic composite structure includes a core structure and a rubber layer, it is resistant to deformation and fracture due to external impact, and can prevent bending in a specific direction, and has an advantage of preventing corrosion with excellent chemical resistance.

In addition, by using a conventional thermosetting epoxy resin reinforcing material, the elastic support can be manufactured only by a heating process without an essential crosslinking process, thereby reducing manufacturing time and cost.

In addition, the elastic composite structure according to the present invention further includes a cresol-based resin adhesive layer containing elastic particles at the interface between the core structure and the rubber layer, thereby further improving adhesion and strength, and impacts, which is a problem of the elastic support using the conventional epoxy resin reinforcement and adhesive. It has the advantage that it can be used for a long time because it prevents breakage and peeling by and has excellent durability.

The elastic composite structure of the present invention has excellent damping characteristics compared to the steel plate used as a reinforcing material of the conventional elastic support, and includes a core structure and a rubber layer that has a superior elongation compared to a thermosetting resin, so that vibration reduction and decline is very fast, and buffering and seismic isolation performance Can improve.

1 is a cross-sectional view of an elastic composite structure according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail through specific examples or examples including the accompanying drawings. However, the following specific examples or examples are only one reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

In addition, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms used in the description in the present invention are merely intended to effectively describe specific embodiments and are not intended to limit the present invention.

In addition, the singular form used in the specification and the appended claims may be intended to include the plural form unless otherwise indicated in the context.

The present invention for achieving the above object relates to an elastic composite structure using a polyamide resin and a method of manufacturing the same.

In the present specification, “prepreg” refers to a sheet in a semi-cured state in which a matrix resin is previously impregnated with reinforcing fibers, and a thermosetting epoxy resin is widely used as the matrix resin. In addition, the “impregnation” refers to a state in which the matrix resin is penetrated into the reinforcing fiber without a gap.

One aspect of the present invention is a core structure comprising a composite prepreg integrated by laminating at least two or more layers of a prepreg manufactured by thermally impregnating at least one mat selected from a glass fiber mat and a carbon fiber mat with a polyamide resin; A rubber layer formed by surrounding the outer portion of the core structure with rubber; And a cresol-based resin adhesive layer comprising elastic particles formed at the interface between the core structure and the rubber layer.

In the present invention, by using a prepreg manufactured using a thermoplastic resin polyamide as a matrix resin, it is possible to overcome the problem that the storage period is short and recycling after curing is impossible due to the characteristics of the prepreg manufactured using the conventional thermosetting resin. It is easy to store, and it is possible to reuse prepreg residues generated during processing and to manufacture prepregs of various sizes.

In addition, as the core structure, a composite prepreg produced by laminating at least one prepreg selected from a glass fiber prepreg manufactured using a polyamide resin, a carbon fiber prepreg, and a mixed prepreg of glass fiber and carbon fiber By using it, the advantages of the glass fiber prepreg and the carbon fiber prepreg can be improved or combined to exhibit synergy, and the disadvantages can be compensated.

Specifically, the prepreg of the present invention has excellent flexural strain, elongation, chemical resistance and low price, which are the advantages of glass fiber prepreg, and has excellent tensile strength, modulus, chemical resistance, and low specific gravity of carbon fiber prepreg. They can also be expressed complementarily.

In addition, as the prepreg is laminated in multiple layers to manufacture a composite prepreg, the flexural strength, flexural strain, and flexural modulus are remarkably improved, and thus it is preferable to withstand deformation or fracture caused by external environment and force.

In addition, in the case of a steel plate used as a reinforcing material for an elastic support in the related art, the steel plate exhibits limited physical properties, but the elastic composite structure of the present invention uniformly obtains desired physical properties by controlling the type and ratio of the prepreg in the composite prepreg. It is desirable to be able to implement it.

In one aspect of the present invention, the polyamide resin may be prepared by a method known to a person of ordinary skill in the art, or a commercially available polyamide resin may be used without limitation. Specifically, for example, any one selected from Nylon 6, Nylon 66, Nylon 610, Nylon 611, Nylon 612, Nylon 1010, Nylon 1011, Nylon 1012, Nylon 1111, Nylon 1112, Nylon 1212, Nylon 46 and Nylon MXD6, etc. It may be a mixture of two or more, but is not limited thereto.

The content of the polyamide resin in the prepreg may be 20 to 80% by weight, more preferably 40 to 60% by weight, but is not limited thereto. The prepreg containing the polyamide resin in the above range has excellent mechanical strength, impact resistance, and flexural strain, and has the effect of easy processing, cutting, and storage. Specifically, it is possible to reuse the prepreg residue generated during processing, and there is an effect of improving work efficiency due to weight reduction.

In one aspect of the present invention, the prepreg may be produced by extruding a polyamide resin at a high temperature and heat-impregnating at least one mat selected from a glass fiber mat and a carbon fiber mat.

The glass fiber mat and carbon fiber mat are used for the purpose of reinforcing the polyamide resin, and specifically, have the effect of imparting physical properties such as excellent tensile strength, flexural strain, chemical resistance, and low specific gravity to the resin.

In one aspect of the present invention, the composite prepreg may be manufactured by laminating at least two or more layers of prepreg and heating and pressing. Specifically, the composite prepreg may be in the form of a single lamination in which two or more layers of glass fiber prepreg are laminated, carbon fiber prepreg is laminated, or a mixed prepreg of glass fiber and carbon fiber is laminated. In addition, the composite prepreg may be in a form in which two or more prepregs selected from a glass fiber prepreg, a carbon fiber prepreg, and a mixed prepreg are laminated, and the laminated form has a flexural strength, flexural strain, and There is an effect of further improving the flexural modulus.

In addition, the composite prepreg not only improves the tensile strength and chemical resistance of the prepreg, but also has excellent flexural strength, so that the strength to endure fracture by external impact is improved.

In one aspect of the present invention, as the composite prepreg, the glass fiber prepreg and the carbon fiber prepreg are sequentially stacked alternately, and the flexural strength, flexural strain and flexural modulus are remarkably improved to have an excellent shear modulus. The effect of preventing deformation and fracture due to is increased.

The ratio of the glass fiber prepreg and the carbon fiber prepreg in the alternately laminated composite prepreg may have a thickness ratio of 20:80 to 80:20, but is not limited thereto. The composite prepreg laminated with the above thickness ratio has excellent mechanical strength and improved flexural strain, thereby absorbing energy and preventing breakage when receiving an external force such as a flexural load.

In one aspect of the present invention, when the composite prepreg has a structure in which three or more layers of prepreg are stacked, the prepreg may be vertically symmetric with respect to the prepreg at the center. The composite prepreg having a symmetrical structure as described above is formed by stacking prepregs having the same upper layer and lower layer, and has an effect of preventing warpage in a specific direction due to external impact.

In one aspect of the present invention, the core structure may be manufactured to a thickness of 1.5 to 6 mm according to the manufacturing dimensions of the elastic support according to KS F 4420, and more preferably, it may be manufactured to a thickness of 2 to 5 mm. It is not limited.

According to one aspect of the present invention, the core structure including the composite prepreg has a thickness within the above range, so that mechanical strength and flexural strain are remarkably improved, and it is deformed when receiving external force and absorbs impact for a long period of time without breaking. It can be used and is preferable.

In one aspect of the present invention, by forming a cresol-based resin adhesive layer including elastic particles formed at the interface between the core structure and the rubber layer, it is possible to improve adhesion and adhesion between the core structure and the rubber layer, and impart excellent strength and durability. Specifically, the adhesive layer matches the interface between the core structure and the rubber layer without voids, so that the adhesion between the core structure and the rubber layer is excellent, so that external impacts are uniformly dispersed to prevent peeling, thereby improving durability.

In one aspect of the present invention, the adhesive layer may be formed by applying an adhesive composition in which elastic particles are dispersed in a resin solution dissolved in an organic solvent on one or both surfaces of a core structure and drying it. In the case of forming the adhesive layer as above, not only the adhesion and adhesion between the core structure and the rubber layer are improved, but also the low impact resistance of the interface is strengthened to absorb the impact even when an external force acts, and to prevent separation of the interface. It can represent the number of shear stages.

In one aspect of the present invention, the thickness of the adhesive layer may be 1 to 100 μm, more preferably 30 to 70 μm, but is not limited thereto. When the adhesive layer has a thickness within the above range, it is possible to further improve adhesiveness and adhesion without disturbing impact transmission between the core structure and the rubber layer.

In one aspect of the present invention, the cresol-based resin may be any one selected from novolak-type or resol-type resin, or a mixture thereof, and the organic solvent for dissolving the resin is not particularly limited, but a specific example , Toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, dimethylformamide, dimethylacetamide, etc. may be any one or a mixture of two or more selected from.

In addition, the resin solution may be prepared with 20 to 60% by weight of a cresol-based resin and 40 to 80% by weight of an organic solvent in order to improve the adhesion and adhesion of the interface according to an embodiment. The resin solution may have a viscosity of 100 to 1,000 cps measured by Brookfield LV2/12 at 26° C., but is not limited thereto.

In one aspect of the present invention, the adhesive layer may be one in which 1 to 60 parts by weight of elastic particles are dispersed based on 100 parts by weight of the resin, and more preferably, 6 to 30 parts by weight may be dispersed, but is not limited thereto. When the adhesive layer is manufactured with the above content, the adhesive layer can be uniformly applied to the core structure, and there is an effect of simultaneously improving adhesion and shock absorption.

In one aspect of the present invention, the elastic particles may be rubber or elastomer powder, for example, butadiene rubber, chlorinated rubber, styrene-butadiene rubber, styrene-butadiene-styrene, acrylonitrile rubber, acrylonitrile-butadiene rubber , Acrylic rubber, ethylene-propylene-diene, reactive olefinic rubber (RTPO), styrene-ethylene-butylene-styrene rubber, styrene-isoprene-styrene rubber, ethylene octene rubber, ethylene propylene rubber, ethylene-propylene-diene rubber And any one or a mixture of two or more selected from styrene-propylene rubber and the like.

In one aspect of the present invention, the elastic particles may have an average particle diameter of 5 to 300 μm, more preferably 10 to 200 μm, but are not limited thereto. As the elastic particles having the average particle diameter are uniformly applied due to improved miscibility with the cresol-based resin solution, improved impact resistance and mechanical properties are uniformly expressed. In addition, by absorbing external impact and energy at the interface between the core structure and the rubber layer to prevent peeling from occurring, the number of shear stages and durability of the elastic composite structure may be further improved.

In one aspect of the present invention, the composite prepreg may further include a reinforcing material for the purpose of improving impact strength, and the reinforcing material may be a long fiber or a fiber woven in a mesh form.

Specifically, the long fibers are continuous short fibers or fiber bundles of 50 mm or more, and the strength and elastic modulus may be further improved by using long fibers in which the fiber bundles made of short fibers are arranged without twisting in a single direction.

In addition, by using the fibers woven in the form of a mesh as a reinforcing material, it is possible to improve ease of handling and impart isotropy to the prepreg. The woven fibers are in the form of plain (0˚, 90˚) and satin, which may be selected according to the required physical properties and characteristics of the elastic composite structure of the present invention, but are not limited thereto. .

In addition, in the related art, a prepreg was manufactured using a reinforcing material having irregularities on the surface, and rubber was cut to surround the prepreg to produce an elastic composite structure. This causes voids to occur along the part where the surface of the prepreg and the rubber do not match, and when an impact is applied to a part of the elastic composite structure, voids are generated even with a small impact, and the interface between the prepreg and the rubber layer is peeled off. . On the other hand, as the prepreg of the present invention has a flat surface, it is excellent in adhesion to the surface of the rubber layer, so that the impact is uniformly dispersed to prevent peeling, thereby improving durability.

In one aspect of the present invention, the rubber layer may be formed in a form surrounding the outer part of the core structure with rubber, and as the rubber, natural rubber, neoprene rubber, synthetic rubber and chloroprene rubber may be used, but limited thereto. It is not.

The rubber layer has a shape that surrounds and wraps the core structure, so that it can exhibit a buffering effect in any impact occurring at the outer side of the elastic composite structure, thereby distributing the vertical load and impact generated by the special structure and improving the seismic isolation performance. effective.

The thickness of the rubber layer can be appropriately selected according to the design and use of the elastic composite structure, and preferably can be cut and used to meet the standard of KS F 4420. Specifically, the rubber layer may be manufactured to a thickness of 0.2 to 50 mm, more preferably 10 to 30 mm, but is not limited thereto. The rubber layer having a thickness in the above range provides an effect of improving impact resistance and flexural modulus.

In one aspect of the present invention, the core structure may be spaced apart from at least two layers in the rubber layer. Specifically, for example, the elastic composite structure may be a structure in which at least two or more layers of a core structure and a rubber are sequentially stacked alternately and the outer side is surrounded by a rubber layer, and an elastic composite structure including the alternately stacked laminate. As the physical properties such as excellent tensile strength, flexural strength, and flexural strain are uniformly expressed, there is an effect of attenuating fracture due to impact in a specific direction.

In one aspect of the present invention, the elastic composite structure may be symmetrical vertically with respect to the core structure in the center when the core structure is spaced apart by three or more layers. The elastic composite structure having a symmetrical structure as described above is formed by stacking a core structure having the same upper layer and lower layer, and the effect of preventing bending and destruction in a specific direction due to external impact can be significantly improved.

According to one aspect, the elastic composite structure of the present invention may be manufactured in a structure in which the upper and lower surfaces and outer circumferential surfaces of the single core structure are wrapped with a rubber layer. According to another aspect, after laminating at least two or more layers of the core structure, the upper and lower surfaces and the outer circumferential surfaces may be wrapped with a rubber layer. According to another aspect, the core structure and the rubber may be sequentially stacked alternately, and the upper and lower surfaces and the outer circumferential surface are surrounded by a rubber layer, and at least two or more layers of the core structure may be manufactured in a form spaced apart in the rubber layer. In addition, the spaced form may have a shape in which all of the core structures of at least two or more layers are spaced apart, or some may be laminated, and some may be separated by laminated rubber at the interface.

The manufacturing method of the elastic composite structure of the present invention is a) laminated at least two layers of prepreg produced by extruding a polyamide resin at high temperature and impregnating at least one mat selected from a glass fiber mat and a carbon fiber mat. A core structure manufacturing step of manufacturing a composite prepreg by heating and pressing; b) applying and drying a cresol-based resin solution containing elastic particles on the surface of the composite prepreg; And c) laminating rubber sheets on both sides of the core structure, followed by heating and compressing, to wrap the outer portion of the core structure with a rubber layer to be integrated.

As the elastic composite structure of the present invention produces a prepreg by thermally impregnating polyamide fibers with a core structure, the prepreg can be reused, and it is possible to manufacture and mass-produce prepregs of various sizes, as well as long-term storage. This is possible and has a light weight effect.

In addition, as a composite prepreg is manufactured by laminating at least two layers of the prepreg, tensile strength, flexural strength, chemical resistance, and flexural strain may be remarkably increased, and desired physical properties may be uniformly realized.

In one aspect of the present invention, after the manufacturing step of the core structure, a cresol-based resin solution containing elastic particles is applied to the surface of the core structure and dried to prepare an adhesive layer, thereby improving adhesion and adhesion between the core structure and the rubber layer, and It shows the effect of preventing separation, and has the advantage of being able to use it for a long time with sufficient strength and excellent durability.

In one aspect of the method for producing the elastic composite structure of the present invention, the prepreg impregnated with the polyamide resin in step a) uses the polyamide resin at 100 to 300°C, more preferably at 150 to 280°C. It may be melted and discharged, applied to one or more mats selected from glass fiber mats and carbon fiber mats, and then impregnated using a hot roller, but is not limited to the above temperature and method.

In one aspect of the present invention, the composite prepreg is molded in a mold, specifically stacking at least two layers of the prepreg in the mold, raising the temperature to 70 to 300 °C, preheating for 5 to 30 minutes, and 0.01 to 30 It may be prepared by applying a ton of pressure and thermoforming for 1 to 100 minutes and then cooling. More preferably, it may be heated to 200 to 300° C. in the mold, preheated for 10 to 20 minutes, and thermoformed for 1 to 30 minutes by applying a pressure of 5 to 25 tons, but is not limited thereto.

In one aspect of the present invention, more specifically, for example, the composite prepreg is laminated on the lower mold and the upper mold is fastened, and then the upper and lower plate surfaces are formed by using an autoclave or a hot press. The core structure can be manufactured by thermoforming after being placed between them. In addition, the core structure thermoformed in the mold may be manufactured by cooling to room temperature while maintaining pressure, and then demolding in the mold, and in order to facilitate the demolding, a Teflon coating treatment in the mold is performed according to one aspect. It may be molded after performing, but is not limited thereto.

In one aspect of the present invention, step a) may further include other processes within a range that does not impair its effect. For example, a short process for removing foreign substances on the surface of the core structure, a surface cleaning process for removing organic materials using a solvent, and removal of residual solvent after cleaning, a heat treatment process for improving evaporation, and a corona or plasma treatment process. Any one or two or more processes may be further included, but the present invention is not limited thereto.

In one aspect of the method for manufacturing the elastic composite structure of the present invention, the step of applying and drying the cresol-based resin solution containing the elastic particles in step b) forms an adhesive layer on the surface of the composite prepreg prepared in step a). This is the step.

The cresol-based resin solution containing the elastic particles according to an aspect of the present invention may be one in which 1 to 60 parts by weight of elastic particles are dispersed based on 100 parts by weight of the cresol-based resin solution dissolved in an organic solvent, and more preferably 6 To 30 parts by weight may be dispersed, but is not limited thereto. The resin solution of the above content may be uniformly applied to the surface of the core structure, and adhesion and shock absorption may be improved at the same time.

According to an aspect of the present invention, the resin composition may be coated by applying any one selected from spray spray coating, roller coating, screen printing, brush coating, flow coating and dip coating, or a combination thereof, but is limited thereto. no. The resin solution may be applied to a thickness of 1 to 100 µm, more preferably 1 to 25 µm after drying, in order to apply a thickness that does not interfere with the impact transmission between the core structure and the rubber layer, but is not limited thereto.

In addition, the drying conditions are not limited in the present invention, but may be performed at 20 to 80° C. for about 30 minutes to 2 hours.

By preparing the adhesive layer by the above application and drying method, it is possible to not only improve the bonding strength between the core structure and the rubber layer in the elastic composite structure, but also improve the excellent impact resistance and elastic effect of the rubber layer to prevent deformation and breakage by external force. have.

In addition, the elastic composite structure manufactured according to an aspect of the present invention is integrated by wrapping the outer part of the core structure with a rubber layer, so that it has excellent buffering effect against external impacts, thereby reducing the vertical load and the amount of impact generated by the special structure. It is effective in dispersing and improving the seismic isolation performance.

In one aspect of the present invention, in the step of integrating the core structure and the rubber layer in step c), the rubber sheets are laminated on both sides of the core structure, the rubber is cut to surround the outer part of the core structure, and then heated using a press. And it may be a step manufactured by pressing, and as the heating and pressing conditions, it may be performed in a range of 120 to 250° C. and an atmospheric pressure of 500 or less according to KS F4420 according to the manufacturing standard of an elastic composite structure for an elastic support.

In addition, step c) may be a step of laminating not only a single core structure as a core structure, but also at least two or more layers of core structure, and then laminating rubber sheets on both sides, wrapping the outer part with rubber, and heating and pressing it. .

In another aspect of the present invention, step c) may be a step of sequentially alternately stacking the core structure and the rubber sheet, wrapping the outer part with a rubber layer, and then heating and pressing to integrate. The core structure may be one selected from a single core structure and at least two or more layers, or a mixture thereof.

The elastic composite structure manufactured by the manufacturing method of the present invention has excellent tensile strength, flexural strength, flexural strain, flexural modulus, chemical resistance, impact resistance and shear modulus, and can withstand deformation or fracture due to external environment and force. Accordingly, it can be applied to special structures such as bridges, tunnels, high-rise buildings, nuclear power plants, and plants to buffer vertical loads, and has excellent seismic isolation performance to safely support structures in preparation for earthquakes.

Hereinafter, the elastic composite structure for an elastic support and a method of manufacturing the same according to the present invention will be described in more detail through examples. However, the following examples are only one reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Further, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms used in the description herein are merely to effectively describe specific embodiments and are not intended to limit the invention.

[Method of measuring properties]

1) Flexural strength, flexural modulus and flexural strain

According to ASTM D7264, the flexural strength, flexural modulus, and flexural strain of the core structure manufactured as follows were measured.

2) Number of previous steps

With a 3,250-ton elastic bearing tester manufactured according to the standard of KS F4420, the number of shear stages of the elastic composite structure manufactured as follows was measured, and it is suitable as an elastic bearing standard for bridge support in the range of 1.15±0.2 MPa.

1. Core structure manufacturing

[Production Example 1]

Nylon 6 (molecular weight: 25,000 ~ 40,000 g/mol) was melt-extruded at 250°C using an extruder, and then nylon 6 discharged using a hot roller was applied to the glass fiber mat and the carbon fiber mat, respectively, and nylon 6 was 33. A glass fiber prepreg having a thickness of 0.3 mm and a carbon fiber prepreg having a thickness of 0.25 mm were prepared.

Thereafter, the prepared glass fiber prepreg and carbon fiber prepreg were laminated to prepare a composite prepreg.

As a specific laminated structure of the prepreg, the glass fiber prepreg is expressed as nGP, the carbon fiber prepreg is expressed as nCP, and n denotes the number of each prepreg laminated and used. In addition, the composite prepreg stacked by repeating (nGP/nCP) m times was expressed as m (nCP/nGP).

The laminated structure of the composite prepreg actually used is as follows.

Lamination configuration: 7CP/8GP

The composite prepreg was placed on the lower surface of the mold, and the upper part of the mold was bound and closed, and then placed between the upper and lower plate surfaces of a hot press. Thereafter, the temperature was raised to 260° C. and preheated for 20 minutes, followed by thermoforming for 5 minutes while applying a pressure of 15 tons. Thereafter, the core structure was manufactured by cooling to room temperature while maintaining the pressure and demolding from the mold.

[Production Example 2]

A core structure was manufactured in the same manner as in Preparation Example 1, except that the laminated structure was prepared as follows.

Lamination configuration: 7(1GP/1CP)/1GP

[Production Example 3]

The prepreg was prepared in the same manner as in Preparation Example 1, except that only 14GP of glass fiber prepreg was laminated.

[Production Example 4]

The prepreg was prepared in the same manner as in Preparation Example 1, except that only 16 CP of carbon fiber prepreg was laminated.

[Production Example 5]

In Preparation Example 3, the glass fiber prepreg was prepared in the same manner, except that the glass fiber prepreg was alternately laminated at 0° and 90°.

Table 1 below shows the analysis results of the preparation example.

Flexural strength (MPa) Flexural strain (%) Flexural modulus (GPa) Manufacturing Example 1 1,534.50 0.1123 111.10 Manufacturing Example 2 1,775.60 0.1240 128.40 Manufacturing Example 3 1,424.35 0.1735 104.00 Manufacturing Example 4 1,920.45 0.0270 137.20 Manufacturing Example 5 1,210.27 0.0920 101.08

As shown in Table 1 above, in the case of Preparation Example 1 of the present invention, since the composite prepreg in which the glass fiber prepreg and the carbon fiber prepreg are laminated in multiple layers is used, compared to Preparation Example 3 in which only the glass fiber prepreg is laminated alone. It was confirmed that the flexural strength and the flexural modulus were improved, and the flexural strain was improved compared to Preparation Example 4 in which only carbon fiber prepreg was laminated alone.

In addition, in the case of Manufacturing Example 2, in the composite prepreg lamination configuration of Preparation Example 1, glass fiber prepreg and carbon fiber prepreg are sequentially stacked alternately, and have a configuration that is vertically symmetric based on the prepreg in the center, which is remarkably excellent. It was confirmed that the flexural strength, flexural strain and flexural modulus were shown.

As a result, the flexural strength and flexural modulus exert synergy, so that excellent mechanical properties and impact resistance are obtained, and the flexural strain is also excellent, so that fracture due to impact such as flexural load can be significantly attenuated.

In addition, since the flexural strain is uniformly maintained, the resistance to deformation or fracture due to external environment and force is superior, and weight reduction is also possible.

2. Manufacture of elastic composite structure

[Example 1]

An adhesive (BRC Co., Ltd., CILBOND 24) containing 22 parts by weight of rubber (average particle diameter 200 μm) in 100 parts by weight of a cresol resin solution dissolved in 20% by weight in toluene on the surface of the core structure prepared in Preparation Example 1 was 50 After spraying to a thickness of µm, it was dried at 80° C. to form an adhesive layer having a thickness of 20 µm.

An elastic structure in which the five core structures on which the adhesive layer is formed and the rubber sheet cut to meet the standard of KS F 4420 are sequentially stacked, and the upper and lower and outer circumferential surfaces are surrounded by rubber, and five core structures are spaced apart as shown in FIG. The composite was prepared.

The elastic structure composite was prepared by preheating at 65° C. for 30 minutes, then heating and pressing at 160° C. at 300 atmospheres with a hot press.

[Example 2]

It was prepared in the same manner as in Example 1, except that the core structure prepared in Preparation Example 2 was used instead of the core structure prepared in Preparation Example 1.

[Example 3]

It was prepared in the same manner as in Example 1, except that the core structure prepared in Preparation Example 3 was used instead of the core structure prepared in Preparation Example 1.

[Example 4]

It was prepared in the same manner as in Example 1, except that the core structure prepared in Preparation Example 4 was used instead of the core structure prepared in Preparation Example 1.

[Example 5]

It was prepared in the same manner as in Example 1, except that the core structure prepared in Preparation Example 5 was used instead of the core structure prepared in Preparation Example 1.

[Comparative Example 1]

It was prepared in the same manner except that an iron plate was used in place of the core structure prepared in Preparation Example 1.

[Comparative Example 2]

It was prepared in the same manner as in Example 1, except that the adhesive layer was not formed.

Table 2 below shows the analysis results of the Examples.

Shear number (MPa) Example 1 1.20 Example 2 1.30 Example 3 1.10 Example 4 1.22 Example 5 1.01 Comparative Example 1 1.15 Comparative Example 2 0.71

As shown in Table 2 above, the elastic composite structure manufactured according to the embodiment of the present invention has a shear modulus suitable for the KS standard and has excellent shear strain, so it can have the effect of attenuating the deformation or fracture of the elastic composite structure due to external impact. It was confirmed that weight reduction was possible and durability was excellent.

Specifically, in the case of Example 1, it was confirmed that the adhesion and adhesion between the core structure and the rubber layer were further improved, so that the effect of preventing separation that may occur at the interface is excellent, and the shock absorption power and durability are simultaneously improved.

In addition, in the case of Example 2, in the composite prepreg lamination configuration of Example 1, the glass fiber prepreg and the carbon fiber prepreg were sequentially stacked alternately so that the composite prepreg was not only vertically symmetric based on the prepreg in the center, but also the composite prepreg. It was confirmed that the included core structure also exhibited remarkably excellent shear strain by having a configuration that is vertically symmetric with respect to the core structure at the center of the rubber layer. It was confirmed that the effect of preventing fracture and warpage in a specific direction was excellent even compared to Example 3 in which only glass fiber prepreg was laminated and Example 4 in which only carbon fiber prepreg was laminated.

In addition, it was confirmed through Example 5 that a core structure in which glass fiber prepregs are alternately laminated at 0° and 90° can be effectively used as an elastic composite structure capable of responding to horizontal and vertical vibration.

Comparative Example 1 used a conventional steel plate having excellent flexural strength, flexural strain and flexural modulus in place of the core structure, and had physical properties suitable for the KS standard, but rapid deformation occurred due to external force as the stress was concentrated. I confirmed that. In addition, after the deformation occurs, the steel plate cannot be restored to its original state and the steel plate is bent, so it may not be able to cope with the impact such as aftershocks after an earthquake. I confirmed that.

In addition, in the case of Comparative Example 2, since the adhesive layer was not formed, the adhesion between the core structure and the rubber layer interface was poor, and it was easily separated, fracture by impact occurred, and the number of shear steps was significantly reduced.

Accordingly, the elastic composite structure manufactured in the embodiment of the present invention can be manufactured as an elastic support for special structures such as bridges, tunnels, high-rise buildings, nuclear power plants and plants, and safely support the structure in preparation for earthquakes and save lives. Can be used to protect.

In addition, as the elastic composite structure is manufactured using a core structure that can be reused and mass-produced and is easy to process and store, it is also possible to reduce weight, thereby improving work and transportation efficiency and lowering construction costs, resulting in economical effects.

As described above, in the present invention, an elastic composite structure for an elastic support and a method of manufacturing the same have been described through specific matters and limited embodiments, but this is only provided to help a more general understanding of the present invention, and the present invention is carried out as described above. It is not limited to the examples, and various modifications and variations are possible from these descriptions by those of ordinary skill in the field to which the present invention pertains.

Therefore, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things that are equivalent or equivalent to the claims as well as the claims to be described later belong to the scope of the spirit of the present invention. .

100: core structure 200: rubber layer 300: adhesive layer 400: elastic composite structure

Claims (8)

A core structure comprising a composite prepreg integrated by laminating at least two or more layers of a prepreg produced by thermally impregnating at least two mats selected from a glass fiber mat and a carbon fiber mat with a polyamide resin;
A rubber layer formed by surrounding the outer portion of the core structure with rubber; And
A cresol-based resin adhesive layer comprising elastic particles formed at the interface between the core structure and the rubber layer;
Including,
The elastic particles are rubber or elastomer powder and have an average particle diameter of 10 to 300 μm,
The adhesive layer contains 1 to 60 parts by weight of elastic particles based on 100 parts by weight of the cresol-based resin, an elastic composite structure. delete delete The method of claim 1,
An elastic composite structure in which at least two or more core structures are spaced apart from each other in the rubber layer. The method of claim 1,
The composite prepreg is an elastic composite structure further comprising a reinforcing material. The method of claim 5,
The reinforcing material is an elastic composite structure of a long fiber or a fiber woven in a mesh form. a) A core for manufacturing a composite prepreg by laminating at least two layers of prepreg produced by extruding a polyamide resin at high temperature and impregnating at least one type of mat selected from a glass fiber mat and a carbon fiber mat, followed by heating and pressing Structure manufacturing step;
b) applying and drying a cresol-based resin solution containing elastic particles on the surface of the composite prepreg; And
c) laminating rubber sheets on both sides of the core structure, heating and pressing, and then wrapping the outer part of the core structure with a rubber layer to integrate;
Including,
The elastic particles are rubber or elastomer powder, having an average particle diameter of 10 to 300 μm, and containing 1 to 60 parts by weight of elastic particles based on 100 parts by weight of the cresol-based resin, a method for producing an elastic composite structure. The method of claim 7,
In the step c), the core structure and the rubber sheet are alternately stacked, the outer part is wrapped with a rubber layer, and then heated and compressed to be integrated.

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