KR20190012957A - Lightweight sandwich panels for military buildings - Google Patents

Abstract

The present invention relates to a lightweight sandwich panel, which comprises: a bulletproof and explosion-proof functional layer; an internal force and insulating functional layer on the bulletproof and explosion-proof functional layer; a bulletproof and security functional layer on the internal force and insulating functional layer; and a soundproof functional layer on the bulletproof and security functional layer, wherein the bulletproof and explosion-proof functional layer is placed in the outermost side. According to the present invention, as the sandwich panel has multiple bulletproof, explosion-proof, internal force, insulating, security, and soundproof functions, the sandwich panel is quickly installed in a severe environment to provide various functions in a building, a military building required for inside protection and security, and a disaster area to be used for protection and a temporary residence.

Description

[0001] Lightweight sandwich panels for military buildings [

The present invention relates to a lightweight composite sandwich panel construction for use in military or military buildings or construction.

The composite material is generally composed of a reinforcing material having excellent mechanical properties and a base material capable of exhibiting mechanical properties inherent to the reinforcing material by fixing the reinforcing material in a specific space so as not to be deformed or moved, It is a material with mechanical properties that can not be exerted by reinforcing materials and matrix alone.

These composite materials have a very long history and are widely used, ranging from soil bricks mixed with plant stem used for thousands of years to carbon fiber composite materials used in aircraft fuselage.

Composite materials employing continuous phase oil, inorganic reinforcing materials and polymer resins, which are of interest in the present invention, have been applied in a wide range of industrial fields in recent years and their use has been expanded. Because of its excellent mechanical properties and low specific gravity compared to conventional metallic or mineral materials, it can reduce the weight of parts and finished products by replacing existing materials, thereby increasing energy efficiency and increasing ease of movement and installation. As a part of it, it has been attracting attention as a substitute material for existing materials in aerospace industry, wind power industry, machinery industry, transportation equipment industry, construction and civil engineering industry.

In addition, since it is a lightweight material having excellent mechanical properties and at the same time, it is a material having excellent heat insulation performance, and thus it is beginning to be applied to new construction materials that reduce energy consumption. In order to satisfy the structural functionality, it is required to have excellent mechanical properties and to prevent the heat loss due to the temperature difference between inside and outside of the building. For this purpose, the composite material is used as a skin material, A sandwich panel construction using a functional sheet material having a physical property as a core can be manufactured and used.

It is known that the basic mechanical properties of the sandwich panel composition can be expressed by the mechanical properties of the skin material and the distance to the other skin materials bonded through the core material as main parameters. This is a concept similar to that for steel I-beams or H-beams where the mechanical properties of the steel are determined by the configuration of flanges and webs. That is, in the section steel, the mechanical properties represented by the material, thickness, width, etc. of the flange portion and the distance between the flanges spaced apart from each other by the web jointly define the mechanical properties of the section steel. Thus, in the sandwich panel construction, the distance between each skin material, which is expressed by the mechanical properties of the skin material and the thickness of the core material, is a major factor in the mechanical properties of the entire sandwich panel.

Functionally, the characteristics of the skin material and the core material can be expressed by the characteristics of the sandwich panel composition, and the sandwich panel construction using the composite material having excellent mechanical properties as the skin material and the functional sheet material having the unique mechanical properties as the core material is excellent It can be used as building material for building construction.

As described above, the sandwich panel composition can be applied to various applications as a material having a very unique function by the combination of the skin material and the core material. As a multifunctional building material of particular interest in the present invention, the sandwich panel construction can be applied as a novel material having a wide variety of possibilities.

On the other hand, there are many types and purpose of buildings besides general buildings which are used as residences of residents. Temporary residential buildings that are not permanent residents, Buildings that can be easily established or moved for commercial purpose, Buildings for storing non-residents, Buildings for storage of various facilities or vehicles, Urban buildings for urgent disaster relief, Wallpaper There is a demand for various types of buildings depending on their uses and functions such as buildings that are easy to establish and special-purpose buildings. Various solutions are proposed to satisfy such demands, and sandwich panel components are also proposed as one of these solutions In fact.

Generally, the sandwich panel construction applied to buildings such as kiosks, factories, warehouses, etc. is a steel plate sandwich panel composed of a steel sheet as a skin material and a foamed resin sheet as a core. The steel plate sandwich panel is applied to many buildings with ease of manufacture and excellent mechanical properties. However, the steel panel sandwich panel has a disadvantage in that the construction method is complicated and a large number of seams are generated between the panels because the width of the steel panel used as the skin material is narrow to 1 m or so and many panels must be successively applied. In addition, since the construction method must be established by fixing the panel to the steel frame after completion of the foundation work on the floor construction and the installation of the steel frame on the floor, It can be installed only in the area where heavy equipment such as heavy equipment for installation can be installed, and because it requires a concrete casting process, it can not be carried out during the concrete curing period, so that the construction period is long. In addition, the buildings constructed with steel panel sandwich panel construction are vulnerable to corrosion because of the large amount of steel plates and steel materials applied, and because of the excellent heat transfer characteristics of metal materials, the internal and external insulation capacity is limited, There is a fundamental problem that the heating and cooling costs can be excessive. Due to these disadvantages, it is very difficult to establish a steel plate sandwich panel building in areas where transportation is inconvenient and where heavy equipment and large transportation means are difficult to access, and where electricity or fuel can not be supplied smoothly. In other words, when the construction of the building is urgently required in areas where heavy equipment is not easily accessible, such as desert or jungle, and energy is difficult to secure, transportation is easy, construction is very short, and energy consumption is minimized Building materials and their structures became necessary. In particular, it is a building that requires functions such as short construction time, construction method that does not require special heavy equipment, protection against external impact, minimization of environmental effects such as temperature and precipitation, soundproofing and noise isolation, These include buildings that need to be installed and have a variety of functions, military buildings that require internal protection and security, and buildings that are urgently installed in disaster areas and can be used for protection and temporary residence.

The present invention provides a multifunctional lightweight composite sandwich panel construction capable of solving the above problems and simplifying existing complex processes. In particular, a lightweight composite multi-functional lightweight composite sandwich panel construction that can be applied to military buildings requiring rapid establishment and disassembly, internal protection and security is disclosed.

Korea Patent Publication No. 2016-0128025

The present invention provides a lightweight multifunctional lightweight composite sandwich panel construction having thermal insulation, interior protection and security functions.

In order to solve the above-described problems, the present invention provides a bulletproof and explosion-proof functional layer; A proof and heat insulating functional layer on the bullet-proof and explosion-proof functional layer; A bulletproof and security functional layer on said proof and heat insulating functional layer; And a soundproof functional layer on the bulletproof and security functional layer.

According to one embodiment of the present invention, the bulletproof and explosion-proof functional layer is composed of an outer layer and an inner layer, and the outer layer is a fiber-reinforced composite material obtained by impregnating a carbon fiber or glass fiber with a resin, Reinforced composite material obtained by impregnating a resin with a resin.

According to one embodiment of the present invention, the strength and adiabatic function layer comprises a skin material and a core material, and the skin material is a sheet-like fiber-reinforced composite material produced by applying, impregnating and polymerizing a polymer resin composition on a reinforcing fiber And the core material is one selected from the group consisting of a foamed resin plate of a polymer resin, a foamed glass, a foam mineral, a glass fiber concentrator, a mineral fiber concentrator and a porous sound absorbing material.

According to one embodiment of the present invention, the bulletproof and security functional layer comprises a bulletproof functional composite material layer and a security functional composite material layer, and the bulletproof functional composite material layer is a composite material obtained by impregnating a resin on an aramid fiber fabric And the resin is 10 to 40 parts by weight with respect to 100 parts by weight of the aramid fiber fabric, and the security functional composite material layer is a composite material obtained by impregnating a resin on a carbon fiber fabric, wherein 100 parts by weight of the carbon fiber fabric And the resin is 30 to 200 parts by weight.

According to an embodiment of the present invention, the sound-absorbing layer comprises a sound-absorbing layer and a sound-insulating layer, and the sound-absorbing layer is a polyester fiber bundle plate having a density of 24 kg / m 3 to 50 kg / Thermosetting rubber and polyvinyl chloride and a mineral, and has a density of 1.5 g / cm < 3 > to 2.2 g / cm < 3 >.

The sandwich panel construction of the present invention is a multifunctional property of bulletproof and explosion proof, proof and insulation, security and soundproofing, and is a building which needs to be installed quickly in a harsh environment to exhibit various functions, military buildings requiring internal protection and security, So that it can be used for protection and temporary residence.

In addition, since the sandwich panel construction of the present invention uses a lightweight material, it has the advantage of increasing the energy efficiency and increasing the ease of movement and installation by reducing the weight of parts and finished products.

Hereinafter, the present invention will be described in detail. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately Should be construed in accordance with the principles that can be defined and meanings and concepts consistent with the technical idea of the present invention.

The lightweight composite sandwich panel construction of the present invention is a lightweight material that has excellent mechanical properties due to its structural characteristics and can act as a skeleton of a building itself and is prepared as a product in which a functional material is mixed in advance at a factory, It is a multifunctional sandwich panel that is easy to establish and can demonstrate its intended function as soon as it is established.

The lightweight composite sandwich panel construction of the present invention comprises a soundproof function layer, a bulletproof and security function layer, a proof and heat insulating function layer, a bulletproof and explosion proof functional layer from the inside of the structure, The contents of the activity are not transmitted to the outside, but are structured to mitigate impacts such as shooting that may be externally applied. If necessary, an outer layer may be added to the upper portion of the soundproof function layer.

The soundproof function layer has a function of preventing conversation contents between manpower in the building and conversation contents using a communication network from being detected from the outside. Soundproofing technology can be divided into sound insulation technology that prevents sound from passing through a specific layer by blocking the transmission of sound, and sound absorption technology that absorbs the transmitted sound and changes it into kinetic energy or thermal energy. Sound insulation materials based on sound insulation technology are mainly made of sheet materials with high density and hard materials. Sound absorbing materials based on sound absorption technology have a porous structure composed of irregularly arranged fibers, which are processed and applied to a plate material having low density and elasticity. The vibration energy of the air delivered to the sound absorbing material vibrates the fibers in numerous holes between the fibers, and is converted into frictional heat by the vibration, so that the energy is absorbed by the sound absorbing material.

The bulletproof and security functional layer is a functional layer for protecting personnel inside the building from external impacts, especially attacks, and preventing internal information from being detected from the outside. This functional layer has a secondary protection function. In the bulletproof and explosion-proof functional layer, an external object that has passed through the functional layer after the shape is firstly deformed and the energy is absorbed is added in the bulletproof and security functional layer So that the energy is absorbed and does not go inside. In addition, since it is a very hard layer, it can serve as a sound insulating material in addition to the soundproof function layer. Particularly, it includes a metal fiber or a carbon fiber layer having electrical conductivity, thereby providing sound insulation and radio wave shielding function to provide security functionality. The bullet proofing function is applied by using a composite material plate with high tensile strength aramid fiber. The sound insulation function and the radio wave shielding function are applied by a composite material plate which is made of carbon fiber having a very hard and electrically conductive property. Layer is composed of a bulletproof and security functional layer.

The strength and adiabatic function layer has the function of minimizing the influence of the inside of the building due to the temperature difference between the inside and outside, by maintaining the shape of the structure by forming a wall or roof of the building. The strength and heat insulating function layer is a sandwich panel structure composed of a skin material and a core material. The skin material is a composite material sheet composed of a continuous phase oil, an inorganic reinforcing material and a polymer resin in order to optimize the proof and heat insulating function. And a foamed resin plate functioning as a heat insulating material.

The bulletproof and explosion-proof functional layer is a functional layer for primarily protecting the internal attraction from external impacts, particularly explosions and fragments or firearms, and is a functional layer on the outer side of the building and an inner layer on the inner side consist of. The outer layer serves to protect the inner layer from the external environment, and to break an external object, which collides with the building, into small pieces to disperse or prevent passage. The inner layer functions to absorb kinetic energy of an external object passing through the outer layer so that an external object can not proceed to the inside or minimizes kinetic energy. The outer layer is made of a high-stiffness, high-strength material, and a composite material of a continuous-phase reinforcement mainly composed of glass fiber or carbon fiber and a polymer resin is used. The inner layer is made of a high-strength material, and a composite material of a continuous-phase reinforcing material and a polymer resin mainly composed of aramid fibers is used.

The lightweight composite sandwich panel construction of the present invention is a sandwich panel structure in which functional layers such as the soundproof function layer, the bulletproof and security function layer, the proof and heat insulating function layer, the bulletproof and explosion proof function layer are integrated, It is possible to obtain a building having various functions by merely constructing and sandwiching the sandwich panel composition in an appropriate manner, so that it is a very effective construction material for buildings that can establish a military building in a short time on site. In addition, when an appropriate fastening method is applied, it is advantageous in that it can be disassembled quickly, moved to another position, and re-established.

Hereinafter, the present invention will be described in more detail.

The sound-insulating function layer is composed of a sound-absorbing layer and a sound-insulating layer. The sound-absorbing layer is mainly composed of a flexible and strong fiber aggregate, and has a structure equivalent to a porous sheet material. Sound energy reaching this sound-absorbing layer induces friction by the vibration of air in the small spaces formed between the fibers of the fiber collecting body, and sound energy is absorbed by the sound energy by heat energy. Some of this sound energy is transmitted to the fiber and is lost while causing the fiber to vibrate. The sound insulation layer is mainly composed of high density material, and the sound insulation performance is known to be proportional to the mass per unit area of the material. The sound insulation material has a function of suppressing the vibration of the sound insulation layer due to the sound energy when the sound energy is transmitted and reflecting the sound. The sound transmitted by this function is no longer transmitted past the sound insulation layer.

As described above, the sound-absorbing layer uses a plate-like material mainly composed of a porous fiber bundle. In the present invention, a plate material on which polyester fibers are gathered is used as a sound absorbing material. In the case of plate materials using mineral-derived fibers, mineral fiber pieces are likely to scatter when exposed to the surface due to the nature of the material, and polyurethane materials may cause scattering of polyurethane materials that have been corroded by long- to be. The sound absorbing material used for the sound-absorbing layer is generally a polyester fiber bundle sheet having a density of 24 kg / m 3 to 50 kg / m 3. The sound absorption performance of the sound absorption material can be changed depending on the density and the thickness, and the material specification can be determined according to the required sound absorption performance.

The sound insulating layer mainly uses a sheet or sheet material having a high density. In the present invention, a sound insulating material obtained by kneading a mineral with a thermosetting rubber or a polyvinyl chloride resin is used. The sound insulating material of this composition has high density due to mixing of high density of minerals. Generally, it has a density of 1.5 g / cm3 to 2.2 g / cm3, and the sound transmittance is low due to less vibration due to sound energy. In addition, there is an effect that vibration energy of sound is attenuated by a flexible and elastic resin component.

The sound-absorbing layer is formed by combining the sound-absorbing layer and the sound-insulating layer to provide a soundproof function. The soundproofing layer is a functional layer exposed to the interior of the building in the lightweight composite sandwich panel construction of the present invention, and is attached to the final process when fabricating the lightweight composite sandwich panel construction. The sound-insulating layer can be attached to the bulletproof and security functional layer of the lightweight composite sandwich panel construction of the present invention. The method of attaching can be bonded to the bulletproof and security functional layer by bonding using an adhesive or by using a steel member. The sound-absorbing layer may be bonded to the upper portion of the sound-insulating layer in the same manner. The sound-absorbing layer and the sound-insulating layer may be prepared by bonding in advance, and the bonded composite body may be attached to the bulletproof and security functional layer. The sound-absorbing layer is preferably exposed in the direction of the sound energy source. However, since the exposed sound-absorbing layer may be damaged in the course of carrying, assembling, and disassembling the lightweight composite sandwich panel construct of the present invention, a member such as an arm of a suitable thickness is fixed to the sound insulation layer prepared on the anti- After the sound-absorbing layer is prepared between these members, an extra bullet-proof and security functional layer may be attached to the upper part of the member to reinforce the bulletproof and security function and to protect the sound-absorbing layer from damage due to external impact. Alternatively, a sheet such as a composite sheet or a polymeric resin extruded sheet may be used by attaching it on the member.

The bulletproof and security functional layer is composed of a bulletproof functional composite material layer and a security functional composite material layer. The above-described anti-tarnish functional composite material layer is made of a composite material comprising a fabric made of continuous aramid fibers having excellent tensile strength as a reinforcement material and a polymeric resin as a base material. The aramid fibers used in the bulletproof functional composite material are mainly produced by using an aromatic polyamide resin having a para- bond. The copper aramid fiber has a characteristic of high strength because it has a relatively long molecular structure in chemical structure and a strong hydrogen bond between amide groups.

The above-mentioned bulletproof functional composite material layer is obtained by preparing prepregs prepared by impregnating a continuous aramid fiber fabric with a resin, laminating them, and integrating them. Examples of the resin to be used herein include thermosetting resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins and phenol resins, and nylon resins, polyester resins, polyvinyl butyral resins, polycarbonate resins, poly Ketone-based resins, and polyurethane-based resins. However, the present invention is not limited thereto. The thermosetting resin and the thermoplastic resin may be used together to prepare a prepreg. The prepregs thus prepared are layered in multiple layers, and then heat and pressure are applied thereto to obtain a composite layer of a suitable thickness. At this time, it is preferable that the amount of the resin impregnated into the continuous phase aramid fiber fabric is 10 to 40 parts by weight per 100 parts by weight of the continuous phase aramid fiber fabric. When the amount of the resin is more than 40 parts by weight based on 100 parts by weight of the continuous-phase aramid fiber fabric, the weight of the bulletproof functional composite material layer becomes heavy, which is disadvantageous in transportation of the sandwich panel construction and deteriorates the bulletproof performance . If the amount of the resin is less than 10 parts by weight based on 100 parts by weight of the continuous-phase aramid fiber fabric, there is a problem in joining of the prepreg layers, and a phenomenon of delamination may occur when an external impact is applied. The thickness of the anti-tarnish functional composite material layer is adjusted according to the required bulletproof performance.

The security functional composite material layer is a composite material having a continuous-phase carbon fiber fabric as a reinforcing material and a polymeric resin as a matrix, and is a layer having a radio wave shielding function. Because the carbon fiber with electrical conductivity is reinforced, the radio waves inside and outside the building are absorbed by the continuous phase carbon fiber and can not pass through the wall or the roof, which is advantageous for communication security and the internal electronic equipment is not influenced by the external radio wave . The above-described security functional composite material layer is obtained by preparing prepregs impregnated with a resin in a continuous-phase carbon fiber fabric, laminating them, and integrating them. The security functional composite material layer is produced by using a continuous phase carbon fiber fabric as a reinforcement material and using the same resin as the resin used for producing the above-described anti-fogging functional composite material layer. The amount of the resin for producing the security functional composite material layer is preferably 30 parts by weight to 200 parts by weight per 100 parts by weight of the continuous-phase carbon fiber fabric. If the amount of the resin exceeds 200 parts by weight with respect to 100 parts by weight of the continuous carbon fiber fabric, the security functional composite material layer becomes thicker than necessary and the electromagnetic wave shielding function may be deteriorated, When the amount is less than 30 parts by weight, adhesion between prepregs is insufficient, and delamination may occur when an impact is externally applied.

The bulletproof functional composite material layer and the security functional composite material layer are each prepared and then integrated by a method of bonding using an appropriate adhesive, or laminated with each prepreg, and then heat and pressure are applied, It is also possible to integrate them.

The force-proof and heat-insulating function layer is composed of a skin material and a core material. The skin material is a composite sheet consisting of a continuous phase oil, an inorganic reinforcement and a polymer resin, and the core is made of a foamed resin plate which imparts structural and thermal properties to the sandwich panel structure.

The composite sheet constituting the skin material of the sandwich panel structure is a sheet-like fiber reinforced composite material prepared by applying, impregnating and polymerizing a resin composition to a continuous phase oil or an inorganic reinforcement. The continuous sheet oil, inorganic reinforcement and various polymers It is a material that dramatically improves the mechanical properties by compounding the resin.

The continuous phase oil and inorganic reinforcement is characterized by using unidirectional fibers, continuous woven fabrics or nonwoven fabrics. Unidirectional fibers can be used to maximize the mechanical performance of the fibers, but because they function in one direction, they are materials that are laminated and used as needed. Since the continuous fiber fabrics are arranged so as to cross each other in a certain direction, it is possible to realize high mechanical properties while reinforcing in a plurality of directions, and various types of fabrics such as plain weave, weave weave, twill weave, Therefore, the physical properties of the composite material can be optimized. The nonwoven fabric has a structure in which the direction of the fibers is more freely arranged than that of the continuous-phase fiber fabric. The reinforcing effect of the nonwoven fabric is lower than that of the unidirectional fiber or the continuous-phase fiber fabric. However, the nonwoven fabric has an advantage in that the mechanical properties are less directional .

The unidirectional fiber, continuous-woven fiber fabric or nonwoven fabric to be used in the present invention is not particularly limited, but from the viewpoint of mechanical properties, the fiber yarn constituting the reinforcing fiber fabric is one kind selected from the group consisting of carbon fiber, glass fiber and aramid fiber, It is preferable to use two or more kinds of fiber yarns. And, as the continuous-woven fabric according to the present invention, the woven fabric made by the weaving method such as plain weave, twill weave, and junior weave is used. The selection of the continuous-phase textile fabrics to be used can be based on the physical properties of the final product, the mechanical properties and the function of the final product desired. For example, when high rigidity is required for the final product, carbon fiber is applied, and when impact strength is required, aramid fiber is mainly selected. Further, the continuous-phase fiber fabrics may be mixed and used.

Next, the resin composition used in the production of the composite sheet of the present invention will be described. As a matrix resin according to the present invention, a thermoplastic resin or a thermosetting resin can be used. The matrix material is impregnated with the reinforcing fiber to be compounded to manifest the mechanical properties of the composite material.

Examples of the thermoplastic resin include polyamide resins, polybutylene terephthalate resins, polycarbonate resins, thermoplastic polyurethane resins, polyphenylene sulfide resins, polyether ether ketone resins, polyolefin resins, polyketone resins , But is not limited thereto. The thermosetting resin is preferably one or more resins selected from the group consisting of an unsaturated polyester resin, a vinyl ester resin, an epoxy resin, a thermosetting urethane resin, and a phenol resin, but is not limited thereto.

The resin used may further include a polymerization catalyst, a UV stabilizer, a color control additive, an impact strength enhancer, a heat stabilizer, a viscosity modifier, and a flame retardant.

The core of the sandwich panel structure is a foamed resin plate of a polymer resin having a plate shape or a bundle of a mineral material and is a plate material having an insulating function. The foamed resin plate, the foamed glass, A mineral fiber, a glass fiber bundle, a mineral fiber bundle or a porous sound-absorbing material. These foams have a density of 20 kg / m 3 to 200 kg / m 3. When the density is less than 20 kg / m 3, the weight of the entire structure is lighter, but the insulation performance, structural performance and compression performance are deteriorated. If the density exceeds 200 kg / m3, the compressive strength is very good, but the weight of the entire structure becomes heavy, and therefore, additional labor is required or equipment is required for construction in the field. The foam is preferably one or two or more foamed resin plates selected from foamed resin plates such as bead polystyrene foam, extruded polystyrene foam, polyethylene terephthalate foam, polyurethane foam, phenol resin foam and polyisocyanurate foam . Further, the polymer resin constituting the foamed material may contain a flame retardant to enhance the flame retardant performance. In addition, foamed glass, foamed mineral, glass fiber bundle, mineral fiber bundle or porous sound-absorbing material can be used as the core material.

A method of manufacturing a sandwich panel structure according to the present invention comprises: preparing a composite sheet by applying, impregnating and polymerizing a resin composition to a continuous phase oil and an inorganic reinforcement; Applying an adhesive on the fiber-reinforced composite sheet; Laminating a foamed resin plate on the adhesive layer; Applying an adhesive on the foamed resin plate; Forming a laminate of a sandwich panel structure by laminating a composite material sheet on the adhesive layer; And bonding the fiber-reinforced composite sheet and the foamed resin plate by applying heat and pressure to the upper, upper, and lower portions of the laminate of the sandwich panel structure to cure the adhesive.

The adhesive layer of the sandwich panel of the present invention will be described. The adhesive layer of the present invention plays a role of bonding the core material, the core material, the core material and the skin material. The adhesive layer is formed by applying one or more resin adhesives selected from the group consisting of a one-pack type urethane resin adhesive, a two-pack type urethane resin adhesive, and an epoxy resin adhesive onto the reinforcing fiber composite material or core material. The adhesive may be used for bonding between soundproofing layers, bulletproof and security functional layers, proof and heat insulating functional layers and bullet proof and explosion proof functional layers. In the present invention, a flame retardant may be mixed with the adhesive layer.

The bulletproof and explosion-proof functional layer is the outermost layer of the lightweight composite sandwich panel construction of the present invention, and has a function of primarily alleviating or defending an external impact or attack applied to a building composed of the same lightweight composite sandwich panel construction.

The outer layer and the inner layer of the bulletproof and explosion-proof functional layer have the function of mitigating the impact transmitted to the inside of the building against direct external impact or attack or defending the projectile or its debris directed toward the inside of the building.

The outer layer of the bulletproof and explosion-proof functional layer has a function of preventing an external object from proceeding while minimizing the deformation amount of the outer layer within an intensity range for an object moving from the outside to the building by applying a material having high rigidity and strength. At this time, the external object is deprived of considerable kinetic energy and can be deformed or destroyed by strong impact. This outer layer is made of a fiber-reinforced composite material and is mainly prepared in sheet or plate form. The fiber-reinforced composite material used for the outer layer is a continuous phase oil or inorganic reinforcing material composed of carbon fibers or glass fibers having high rigidity and strength, and in particular, one-directional fibers or continuous-phase fiber fabrics of continuous phase carbon fiber or continuous phase glass fiber Is preferably used.

The fiber-reinforced composite material constituting the outer layer of the bullet-proof and explosion-proof functional layer is obtained by preparing a prepreg impregnated with a continuous-phase carbon fiber or a continuous phase glass fiber cloth with a resin and then laminating and integrating the prepreg.

Examples of the resin to be used herein include thermosetting resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins and phenol resins, and nylon resins, polyester resins, polyvinyl butyral resins, polycarbonate resins, poly Ketone resins, polyurethane resins, and the like, and prepregs can be produced by using the thermosetting resin and the thermoplastic resin together.

In order to enhance the impregnation property of the resin, the thermoplastic resin can be selected and a prepreg can be produced by the following method.

The resin composition comprising the thermoplastic resin particles is applied onto the reinforcing fiber. The particles of the above-described constitution are in the form of powder, and the powder can be easily prepared by adding a thermal polymerization catalyst to the melt of the monomer of the thermoplastic polymer and dispersing the powder. The powder is dispersed in the fiber- It should be interpreted to include all forms of granules, pellets, etc., as long as it can be dispersed on the surface. By uniformly dispersing the powder composed of particles on the reinforcing fiber fabric layer, the surface of the fiber reinforcing material is covered with the powder, and the volume ratio with respect to the fiber reinforcing layer can be adjusted according to the scattering thickness of the powder.

Then, the thermoplastic polymer is thermally polymerized with the monomer of the thermoplastic polymer so that the particles are melted and impregnated into the reinforcing fiber layer. That is, when the reinforcing fiber layer coated with the particles is subjected to heat treatment, the monomer as a matrix component of the powder composed of particles is melted. Since the melt of the monomer is low in viscosity, it is well impregnated into the fiber reinforcement. The monomer melt impregnated on the fiber-reinforced layer is also polymerized into a polymer by a dispersed thermal polymerization catalyst. The heat treatment can be appropriately selected, for example, at a temperature at which the monomer can be melted and polymerized, for example, at 160 to 300 ° C, and the heat treatment temperature can be adjusted stepwise as needed.

The prepared prepregs are laminated in multiple layers, and then heat and pressure are applied thereto to obtain an outer layer having an appropriate thickness. At this time, it is preferable that the amount of the resin impregnated into the continuous-phase carbon fiber fabric is 35 parts by weight to 100 parts by weight with respect to 100 parts by weight of the continuous-phase carbon fiber fabric. If the amount of the resin exceeds 100 parts by weight with respect to 100 parts by weight of the continuous carbon fiber fabric, the outer layer may not have sufficient stiffness and the outer layer may not be blocked and the outer layer may be deformed or broken. When the amount of the resin is less than 35 parts by weight based on 100 parts by weight of the continuous carbon fiber fabric, a sufficient impregnation of the resin can not be achieved, and a defective part having a very low rigidity and strength may be generated. The amount of the resin impregnated in the continuous phase glass fiber cloth is preferably 25 parts by weight to 70 parts by weight with respect to 100 parts by weight of the continuous phase glass fiber fabric. If the amount of the resin exceeds 70 parts by weight with respect to 100 parts by weight of the continuous carbon fiber fabric, the outer layer may not have sufficient stiffness and the outer layer may not be blocked and the outer layer may be deformed or broken. When the amount of the resin is less than 25 parts by weight with respect to 100 parts by weight of the continuous-phase glass fiber cloth, sufficient impregnation of the resin can not be achieved, so that defective parts with very low rigidity and strength may be generated.

A function film, a sheet, and a plate material may be attached or installed on the outer layer of the bulletproof and explosion-proof functional layer to minimize the influence of the external environment on the dynamic carbon-proof and explosion-proof functional layer.

The inner layer of the bullet-proof and explosion-proof functional layer is made of a material having high toughness and strength. In the outer layer, an outer object, which is not obstructed by progress, passes through the outer layer, . Most objects pass through the outer layer and are deformed or destroyed into small pieces. When these objects reach the inner layer, they encounter material with high toughness and strength, and most of them lose their kinetic energy and become trapped in the inner layer. That is, the kinetic energy of the external object penetrating the outer layer is transferred to the continuous phase oil and inorganic reinforcement through the polymer resin of the fiber-reinforced composite material forming the inner layer, and the continuous phase fiber and the continuous phase fiber Transmits the kinetic energy transmitted to the fiber in a very short time and attenuates and absorbs the kinetic energy. Particularly, continuous-phase fibers having a high tensile strength and high toughness are very suitable as continuous phase oil and inorganic reinforcement forming the inner layer because of the great effect of attenuating and absorbing the kinetic energy.

The inner layer of the bulletproof and explosion-proof functional layer is made of a fiber-reinforced composite material made of a continuous aramid fiber having excellent tensile strength as a reinforcing material and a polymeric resin as a base material. The aramid fibers used in the inner layer are produced using an aromatic polyamide resin mainly consisting of para- bonds.

The inner layer of the bulletproof and explosion-proof functional layer is obtained by preparing a prepreg impregnated with a resin in a continuous aramid fiber fabric and then laminating and integrating the prepreg. Examples of the resin to be used herein include thermosetting resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins and phenol resins, and nylon resins, polyester resins, polyvinyl butyral resins, polycarbonate resins, poly Ketone-based resins, and polyurethane-based resins. However, the present invention is not limited thereto. The thermosetting resin and the thermoplastic resin may be used together to prepare a prepreg. An inner layer having an appropriate thickness is obtained by laminating the prepared prepregs in multiple layers, and applying heat and pressure to integrate them. At this time, it is preferable that the amount of the resin impregnated into the continuous phase aramid fiber fabric is 10 to 40 parts by weight per 100 parts by weight of the continuous phase aramid fiber fabric. When the amount of the resin is more than 40 parts by weight based on 100 parts by weight of the continuous-phase aramid fiber fabric, the weight of the bulletproof functional composite material layer becomes heavy, which is disadvantageous in transportation of the sandwich panel construction and deteriorates the bulletproof performance . If the amount of the resin is less than 10 parts by weight based on 100 parts by weight of the continuous-phase aramid fiber fabric, there arises a problem in joining of the prepreg layers, thereby causing delamination phenomenon when an impact is applied from the outside, And penetrate through the explosion-proof functional layer.

The inner and outer layers of the bulletproof and explosion-proof functional layer can be prepared by adjusting the thickness of the prepreg to be laminated according to the required performance.

Hereinafter, the method of preparing the lightweight composite sandwich panel according to the present invention will be described in detail with reference to the following examples, but the scope of the present invention is not limited by the following examples.

[Example]

(1) Manufacture of a bulletproof and explosion-proof functional layer

A glass fiber cloth having a basis weight of 1,000 g / m 2 woven using a glass fiber roving having a line density of 2,400 tex was prepared and an ultra low-viscosity polyamide 6 resin powder having an average particle diameter of 100 micrometers was prepared as a matrix.

 A glass fiber cloth having a width of 2.2 m prepared in a rolled state was loosened on a conveyor belt, and 880 g of polyamide 6 resin powder per 1 m < 2 > of the glass fiber fabric was uniformly applied on the fabric , And one layer of the glass fiber fabric was further prepared, and the upper part of the glass fiber cloth and the polyamide 6 resin powder mixture prepared as described above was covered while being moved in a roll in the same manner as above. The thus prepared raw material is continuously heated while applying pressure to heat the resin so that the resin is melted to impregnate the resin between the glass fibers and then the composition is cooled to prepare a fiber reinforced composite prepreg sheet for producing the outer layer of the bulletproof and explosion- .

A 2 x 2 basket weave having a basis weight of 410 g / m < 2 >, woven with aramid fibers of 1,500 denier in width, rolled in a roll of 2.2 m, was loosened at a constant speed 50 g of polyamide 6 resin powder per 1 m < 2 > of the aramid fiber fabric was uniformly applied on the fabric, and the aramid fiber fabric and the polyamide 6 resin powder mixture were continuously heated while applying pressure to melt the resin, After impregnating the resin, the composition was cooled to obtain a fiber reinforced composite prepreg sheet for producing an inner layer of a bulletproof and explosion-proof functional layer having a constant thickness.

The composite prepreg sheet for outer layer production obtained by the above process was cut to 2.2 m wide and 6.2 m long to prepare four sheets. The composite prepreg sheet for inner layer production was cut to 2.2 m wide and 6.2 m long to prepare 30 sheets . 30 sheets of composite prepreg sheets for inner layer production were laminated on the raw material conveying roller conveyor and prepared. Four composite prepreg sheets for outer layer production were prepared on the laminate, and then a white polyester film Were prepared.

The laminate of the composite prepreg sheet and the white polyester film prepared as described above was integrated by applying heat and pressure to produce a bulletproof and explosion-proof functional layer having a thickness of 16 mm. At this time, the outer layer of the bullet-proof and explosion-proof functional layer had a thickness of 6 mm and the inner layer had a thickness of 10 mm.

(2) Production of proof and heat insulating functional layer

A glass fiber fabric having a basis weight of 580 g / m 2 woven using a glass fiber roving having a linear density of 1,200 tex was prepared and an ultralow-viscosity polyamide 6 resin powder having an average particle diameter of 100 micrometers was prepared as a matrix.

 While the prepared glass fiber cloth having a width of 2.2 m was wound in a rolled state, 510 g of the polyamide 6 resin powder per 1 m < 2 > of the glass fiber fabric was uniformly applied on the fabric while loosely spreading the one- , And one layer of the glass fiber fabric was further prepared, and the upper part of the glass fiber cloth and the polyamide 6 resin powder mixture prepared as described above was covered while being moved in a roll in the same manner as above. The raw materials prepared as described above were continuously pressurized to apply heat to melt the resin to impregnate the resin between the glass fibers, and then the composition was cooled to obtain a composite sheet having a constant thickness.

Two sheets were prepared by cutting the composite sheet to a width of 2.2 m and a length of 6.2 m, and a foamed polyethylene terephthalate resin plate having a density of 70 kg / m 3 and a thickness of 150 mm was prepared. One sheet of the composite sheet was prepared on a workbench, and a two-pack type urethane adhesive was applied on the composite sheet. A foamed polyethylene terephthalate resin plate prepared on a two-component urethane adhesive was placed, and a two-component urethane adhesive was applied on the resin plate. One sheet of the composite material prepared on the above two-pack type urethane adhesive was prepared, and the composite material sheet and the foamed resin plate laminate were cured by applying heat while applying pressure, thereby integrally forming a proof and heat insulating functional layer .

(3) Manufacture of anti-ballistic and security functional layers

A carbon fiber fabric having a basis weight of 280 g / m < 2 > and weaving using a carbon fiber having a line density of 400 tex (6 K) was prepared and an ultralow-viscosity polyamide 6 resin powder having an average particle diameter of 100 micrometers was prepared as a matrix.

 A prepared carbon fiber cloth having a width of 1.2 m was wound in a rolled state, and one layer of the carbon fiber cloth was unwound on the conveying belt, and 350 g of the polyamide 6 resin powder per 1 m < 2 > , One layer of the carbon fiber fabric was further prepared, and the upper portion of the carbon fiber fabric and the polyamide 6 resin powder mixture prepared as described above was covered while being moved in a roll in the same manner as above. The raw materials prepared as described above are continuously pressurized to apply heat to melt the resin to impregnate the resin between the carbon fibers, and then the composition is cooled to produce a uniform thickness of the bulletproof and security functional layer, To obtain a fiber reinforced composite prepreg sheet.

A 2 x 2 basket weave having a basis weight of 410 g / m < 2 > woven with aramid fibers of 1,500 denier in width with a width of 1.2 m and rolled in roll was loosened at a constant speed by loosening one layer on the conveyor belt in the same manner as above 50 g of polyamide 6 resin powder per 1 m < 2 > of the aramid fiber fabric was uniformly applied on the fabric, and the aramid fiber fabric and the polyamide 6 resin powder mixture were continuously heated while applying pressure to melt the resin, After impregnating the resin, the composition was cooled to obtain a fiber reinforced composite prepreg sheet for the production of a bulletproof functional composite layer of a bulletproof and security functional layer of a certain thickness.

The composite prepreg sheet for the production of the security functional composite material layer obtained by the above process was cut to a width of 1.2 m and a length of 6.2 m to prepare a composite prepreg sheet for manufacturing a bulletproof functional composite material layer having a width of 1.2 m and a length of 6.2 m And 30 sheets were prepared. One composite prepreg sheet for the production of the security functional composite material layer was laminated and prepared on the upper part of the raw material conveying roller conveyor and 30 sheets of composite prepreg sheets for manufacturing a bulletproof functional composite material layer were prepared on the laminated materials, A white polyester film having a thickness of 50 mu m was prepared.

A laminate of the composite prepreg sheet and the white polyester film prepared as described above was integrated by applying heat and pressure to produce a bulletproof and security functional layer having a thickness of 11 mm. At this time, the security functional composite material layer of the bulletproof and security function layer was 1 mm in thickness and the bulletproof functional composite material layer was 10 mm in thickness.

(4) Manufacture of Soundproofing Layer

The sound-absorbing layer of the soundproofing layer was a polyether fiber concentrator having a width of 1 m, a width of 2 m, and a thickness of 25 mm and having a density of 45 kg / m 3. As a sound insulating layer, a polyvinyl chloride resin composite material having a width of 1 m, a width of 1 m and a thickness of 2 mm was prepared and a product having a specific gravity of 2.1 g / cm 3 was prepared.

(5) Manufacture of Lightweight Composite Sandwich Panel Components

Each functional layer prepared by the above steps (1) to (4) was prepared. A width of 28 mm, a width of 28 mm, and a length of 3 m. The composite sheet prepared in the step (2) was cut to a width of 2 m and a length of 6 m to prepare one sheet.

The bulletproof and explosion-proof functional layer obtained in the above step (1) was prepared by cutting with a circular saw at a width of 2 m and a length of 6 m. The proof and heat insulating functional layer obtained in the above step (2) was prepared by cutting it with a circular saw to a width of 2 m and a length of 6 m. The bulletproof and security functional layer obtained in the step (3) was prepared by cutting to a width of 1 m and a length of 6 m.

The bulletproof and explosion-proof functional layer was prepared on the workbench by the above method, and the white polyester film was placed on the bonded side. A two-pack type urethane adhesive was applied on the prepared anti-bullet and explosion-proof functional layer. The force-proof and heat-insulating functional layer cut by the above method was disposed on the applied adhesive so as not to deviate from the bullet-proof and explosion-proof functional layer. Two-component urethane adhesive was applied on the disposed strength and heat insulating functional layer. A bulletproof and security functional layer was disposed on the applied adhesive so that the bulletproof functional composite material layer was bonded on the proof and heat insulating functional layer. A two-pack type urethane adhesive was applied on the deployed bulletproof and security functional layer. The sound insulating layer prepared on the applied adhesive was disposed so as to have no gap between the sound insulating layers. The prepared braces were placed on the placed sound insulating layer and fixed to the bulletproof and security function layer and the sound insulating layer by a direct-coupling screw having a length of 50 mm. At this time, the distance between the centers of the respective elements was 1,028 mm, so that the sound-absorbing layer could be fitted without any empty space. And arranged so as to be perpendicular to each other on the cut surfaces of the respective pieces arranged by using the extra pieces, so that the sound-absorbing layer was allowed to stay in the prepared frame. A sound-absorbing layer was sandwiched between the prepared frame and the two-part type urethane-based adhesive was applied on each piece. The composite sheet prepared in the step (2) was placed on the applied adhesive so as to fit the size of the sandwich panel construct and fixed to each piece with a direct-coupling screw having a length of 50 mm. A lightweight composite sandwich panel construction having a width of 2 m and a length of 6 m was obtained by the above process.

The lightweight composite sandwich panel structure obtained by the above method is produced and stored in advance in accordance with the design in the factory, and is transported to the site as needed to quickly assemble the building.

It is therefore suitable for use as a sandwich panel construction for military purpose structures that require promptness.

Claims (6)

Anti-ballistic and explosion-proof layers;
A proof and heat insulating functional layer on the bullet-proof and explosion-proof functional layer;
A bulletproof and security functional layer on said proof and heat insulating functional layer; And
And a soundproof function layer on said bulletproof and security functional layer, said bulletproof and explosion proof functional layer being located at the outermost location.
The method according to claim 1,
Wherein the outer layer is a fiber reinforced composite material obtained by impregnating a carbon fiber or glass fiber with a resin and the inner layer is a fiber reinforced composite obtained by impregnating a resin on an aramid fiber ≪ RTI ID = 0.0 > 1, < / RTI >
The method according to claim 1,
Wherein the strength and heat insulating functional layer is made of a skin material and a core material, and the skin material is a sheet-form fiber reinforced composite material produced by applying, impregnating and polymerizing a polymer resin composition on a reinforcing fiber, Wherein the lightweight sandwich panel construction is one selected from the group consisting of a resin plate, a foamed glass, a foamed mineral, a glass fiber bundle, a mineral fiber bundle, and a porous sound absorbing material.
The method according to claim 1,
Wherein the bulletproof and security functional layer comprises a bulletproof functional composite material layer and a security functional composite material layer, the bulletproof functional composite material layer is a composite material obtained by impregnating an aramid fiber fabric with a resin, and the aramid fiber fabric comprises 100 parts by weight Characterized in that the resin is 10 to 40 parts by weight and the security functional composite material layer is a composite material obtained by impregnating a resin on a carbon fiber fabric and the resin is 30 to 200 parts by weight per 100 parts by weight of the carbon fiber fabric Lightweight sandwich panel construction.
The method according to claim 1,
Wherein the sound-absorbing layer comprises a sound-absorbing layer and a sound-insulating layer, and the sound-absorbing layer is a polyester fiber bundle sheet material having a density of 24 kg / m 3 to 50 kg / m 3. The sound-insulating layer is made of thermosetting rubber or polyvinyl chloride And a density of 1.5 g / cm < 3 > to 2.2 g / cm < 3 >.
3. The method of claim 2,
Wherein the resin is one or more thermoplastic resins selected from the group consisting of a nylon resin, a polyester resin, a polyvinyl butyral resin, a polycarbonate resin, a polyketone resin, and a polyurethane resin Lightweight sandwich panel construction.