KR20240078508A - Helmet wiht improved active visibility, impact resistance and fire-retardancy - Google Patents

Abstract

The present invention includes a main body in which the wearer's head is accommodated, the upper part and the occipital part are closed, and the lower part and the facial part are open; A shock absorbing layer made of memory foam provided on the inner peripheral surface of the main body to relieve the shock transmitted to the wearer's head; and a protective cover disposed on the face portion to protect the wearer's face, wherein the main body is formed of a self-reinforcing composite material in which the base material and the reinforcing material are made of the same material.

Description

Helmet with improved active visibility, impact resistance and flame retardancy {HELMET WIHT IMPROVED ACTIVE VISIBILITY, IMPACT RESISTANCE AND FIRE-RETARDANCY}

The present invention relates to a helmet, and specifically, to a helmet with improved impact resistance and flame retardancy while ensuring visibility of the face part.

In general, riot helmets are equipment that protects people by absorbing and dispersing external shocks when suppressing protests, thereby preventing head injuries due to impacts.

Conventional protest helmets weigh around 1.5 kg, are made of styrofoam for shock absorption, and use a protective cover made of polycarbonate (PC) for the face.

However, conventional helmets cause high fatigue in the wearer when worn for a long period of time, the polycarbonate material used in the face part is weak to static electricity and scratches, and has a high rate of expansion and contraction due to temperature, causing cracks to easily occur in the finished area.

Korean Patent Application Publication No. 10-2010-0131246

For example, as shown in FIG. 9, the helmet described in the patent document relieves the impact applied to the wearer's head through a cushioning material and protects the wearer's chest through a chest protector.

However, since the helmet described in the patent document does not take into account any damage caused by impact or flame to the helmet itself, it costs a lot of money to maintain and repair the helmet.

Therefore, in order to prevent damage to the helmet itself while ensuring the safety of the wearer, a helmet with improved impact resistance and flame retardancy is required.

In addition, a helmet that can safely secure frontal vision even if the protective cover of the face is scratched is required.

In order to achieve the above-described technical problem, the present invention includes a main body in which the wearer's head is accommodated, the upper part and the occipital part are closed, and the lower part and the facial part are open; A shock absorbing layer made of memory foam provided on the inner peripheral surface of the main body to relieve the shock transmitted to the wearer's head; and a protective cover disposed on the face and protecting the wearer's face. The aim is to provide a helmet in which the main body is formed of a self-reinforcing composite material in which the base material and the reinforcing material are made of the same material.

Additionally, the self-reinforcing composite material of the present invention may be formed in a form in which reinforcing materials are laminated and melt-bonded between base materials.

Additionally, the base material of the present invention may be a polypropylene film, and the reinforcing material may be polypropylene fiber.

In addition, the present invention may further include a flame-retardant coating layer formed on the outer peripheral surface of the main body, and this flame-retardant coating layer is a flame-retardant epoxy composite material containing an epoxy resin, a nanocarbon structure, and a curing agent. The curing agent is tannic acid, and the nanocarbon structure Can be graphene oxide coated with tannic acid and reduced by the coated tannic acid.

Additionally, the protective cover of the present invention may be made of transparent polycarbonate material.

In addition, the protective cover of the present invention may further include a self-healing protective film layer, and this self-healing protective film layer includes a dianhydride-based monomer; A first diamine-based monomer containing an aliphatic compound; and a second diamine-based monomer containing a disulfide compound. The copolymerized polyimide resin composition may include a polyimide resin composition containing a hydrogen bond and a disulfide bond.

In the present invention, scratches on the protective cover mounted on the face can be restored, thereby actively securing the wearer's field of vision.

In addition, the present invention can significantly reduce the wearer's fatigue through a self-reinforced composite material that is both lightweight and impact resistant.

Additionally, the present invention can safely protect the wearer from flames through a flame retardant coating layer.

1 is a schematic diagram schematically showing the main components of a helmet according to an embodiment of the present invention.
Figure 2 is a schematic diagram schematically showing the material of the helmet body according to an embodiment of the present invention.
Figure 3 is an image of a self-reinforcing composite material used as a helmet body material according to an embodiment of the present invention.
Figure 4 is a schematic diagram schematically showing a method of implementing a flame retardant coating layer according to an embodiment of the present invention.
Figure 5 is a schematic diagram schematically showing the manufacturing process of a flame retardant coating layer according to an embodiment of the present invention.
Figure 6 is a schematic diagram schematically showing a protective cover according to an embodiment of the present invention.
Figure 7 is a schematic diagram schematically showing the self-healing mechanism of the self-healing protective film layer according to an embodiment of the present invention.
Figure 8 is an image showing the self-healing efficiency and pencil hardness test results of the self-healing protective film layer according to an embodiment of the present invention.
Figure 9 schematically shows a conventional protest helmet.

Hereinafter, a helmet according to an embodiment of the present invention will be described through preferred embodiments of the present invention based on the attached drawings.

Prior to explanation, when it is said that a part "includes" a certain component, this does not mean excluding other components, unless specifically stated to the contrary, but may further include other components.

Additionally, in various embodiments, components having the same configuration will be representatively described in one embodiment using the same symbols, and only other components will be described in other embodiments.

In addition, although embodiments of the present invention have been described with reference to the attached drawings, this is for illustrative purposes only, and the technical idea, configuration, and application of the present invention are not limited thereby.

1 is a schematic diagram schematically showing the main components of a helmet according to an embodiment of the present invention.

As shown in FIG. 1, the helmet according to one embodiment of the present invention consists of a body in which the wearer's head is accommodated, the upper part and the occipital part are closed, and the lower part and the facial part are open.

In addition, a shock absorbing layer made of memory foam is provided on the inner peripheral surface of the main body, which can alleviate the shock transmitted to the wearer's head.

Additionally, a protective cover that protects the wearer's face may be placed on the face portion of the main body.

The main body is made of a self-reinforcing composite material in which the base material and reinforcing material are made of the same material, and has a shape where the upper part and the back of the head are closed, and the lower part and the facial part are open. That is, the main body is provided to have a hemispherical shape so that the user can wear it on the head. Here, “hemisphere” refers to the shape corresponding to the upper part of the body and the back of the head, and although not shown, it may be configured to have a structure that can cover the chin area and the ear area.

The shock-absorbing layer that relieves the shock transmitted to the wearer's head may be made of memory foam made of low-elasticity polyurethane or latex.

This type of memory foam can gradually and completely return to its original shape when the load is removed, and is a high-density shock-absorbing material that has the characteristic of maintaining high resilience even after long-term use.

In addition, a shock-absorbing layer made of memory foam is provided in close contact with the inner surface of the aforementioned main body. Specifically, the shock-absorbing layer and the main body may be provided in a state of being adhered to each other, or the shock-absorbing layer may be placed on the inner side of the main body without using a separate adhesive material.

Meanwhile, the characteristics and materials of the protective cover, which is placed on the face of the main body and protects the wearer's face, will be described below.

Figure 2 is a schematic diagram schematically showing the material of the helmet body according to an embodiment of the present invention.

As shown in FIG. 2, the main body according to an embodiment of the present invention may be formed of a self-reinforcing composite material in which the base material and the reinforcing material are made of the same material, and a flame retardant coating layer may be disposed on the outside.

The material of the conventional helmet body is often carbon fiber composite reinforcement (CFRP). When a helmet is made of this CFRP material, it weighs about 1.5 kg and has no ventilation structure, causing high fatigue to the wearer when worn for a long period of time. You can.

Therefore, the present invention applies self-reinforced composites (SRC) to produce a helmet with improved performance with a weight reduction rate of up to 15% and impact resistance of 300%, as shown in [Table 1] below.

[Table 1]

Figure 3 is an image of a self-reinforcing composite material used as a helmet body material according to an embodiment of the present invention.

As shown in Figure 3, the self-reinforcing composite material, which is the material of the main body of the helmet according to one embodiment of the present invention, used polypropylene film as a base material and polypropylene fiber as a reinforcing material.

Specifically, the self-reinforcing composite may be a multi-layer lamination of a polypropylene fiber layer as a reinforcing material and a polypropylene film layer as a base material. In the present invention, multiple layers may be multiple layers of one or more reinforcing material layers and one or more base material layers.

In addition, the self-reinforcing composite may, for example, be made of a reinforcing material layer and a base material layer laminated, melted, and bonded, but is not limited thereto.

As described above, self-reinforced composites have a very low specific gravity, but can have mechanical properties similar to those of conventional CFRP in terms of tensile modulus and strength.

In addition, not only is it possible to reduce weight by more than 30% compared to CFRP, but also has excellent recyclability compared to conventional CFRP because the base material and reinforcing material are made of the same material. Conventional CFRP had limitations in recyclability because it was used after being crushed or only the fibers were selectively separated and reused.

Figure 4 is a schematic diagram schematically showing a method of implementing a flame retardant coating layer according to an embodiment of the present invention, and Figure 5 is a schematic diagram schematically showing the manufacturing process of a flame retardant coating layer according to an embodiment of the present invention.

As described above, in the helmet according to one embodiment of the present invention, a flame retardant coating layer may be disposed on the outer peripheral surface of the main body.

In general, flame retardancy is required for helmets to protect the body from dangerous substances (flammables) thrown when suppressing protests, but none of the defensive equipment currently being distributed is flame retardant except for radiation clothing. Therefore, the present invention can implement flame retardant performance by applying a non-halogen-based eco-friendly flame retardant coating agent to the surface of the helmet.

In addition, the flame retardant coating layer according to an embodiment of the present invention is a flame retardant epoxy composite material containing an epoxy resin, a nanocarbon structure, and a curing agent. The curing agent is tannic acid, and the nanocarbon structure is coated with tannic acid and reduced by the coated tannic acid. It can be graphene oxide.

For example, the flame retardant coating layer of the present invention includes the steps of coating and reducing the nanocarbon structure with tannic acid (TA), mixing the coated nanocarbon structure, a curing agent, and an epoxy resin to form an epoxy solution, and forming the epoxy solution. Through a curing step, it can be manufactured into a flame-retardant epoxy composite material.

Specifically, first, the nanocarbon structure can be coated with tannic acid (TA) and reduced. This coating may be done by dispersing the tannic acid and nanocarbon structure in a solvent, for example, by ultrasonic dispersion.

In addition, reduction may be in the temperature range of 40 to 80°C for 12 to 36 hours. Through this reduction process, the nanocarbon structure is reduced, and the prepared flame-retardant epoxy composite material has excellent flame retardancy and mechanical properties. You can.

The nanocarbon structure formed as a result can have excess tannic acid removed through centrifugation, and the separated nanocarbon structure can be dispersed in water and then freeze-dried to obtain a powder form, including a tannic acid-coated nanocarbon structure, The curing agent and epoxy resin can be mixed to form an epoxy solution.

In one embodiment, the curing agent may be mixed at a molar ratio of 0.1 to 2 based on the functional group of the epoxy resin. For example, the curing agent may be mixed at a molar ratio of 0.5 to 2.0, 0.5 to 1.2, 0.8 to 1.2, or 1.0 to 1.2 molar compared to the functional group of the epoxy resin. When the curing agent is mixed in an amount of less than 0.1 mol or more than 2 mol compared to the functional group of the epoxy resin, the dispersion of the filler contained in the manufactured flame-retardant epoxy composite material may decrease, and thus the flame retardancy of the epoxy resin may decrease. there is.

In one embodiment, the solvent can be removed from the mixture prior to curing. If solvent remains, the remaining solvent may volatilize during curing, forming defects such as air bubbles in the epoxy resin, which may deteriorate mechanical and flame retardant properties.

In one embodiment, the curing process may be performed multiple times, for example, twice.

Specifically, the curing step includes primary curing for 30 minutes to 2 hours at a temperature range of 120 to 200 ° C., and secondary curing for 1 to 4 hours at a temperature range of 170 to 250 ° C. It can be included.

Through this, the flame-retardant epoxy composite material according to one embodiment of the present invention can provide flame retardancy to the polymer material by including the nanocarbon structure as a filler.

Figure 6 is a schematic diagram schematically showing a protective cover according to an embodiment of the present invention, and Figure 7 is a schematic diagram schematically showing a self-healing mechanism of a self-healing protective film layer according to an embodiment of the present invention.

As shown in Figures 6 and 7, the transparent self-healing film to be applied to the protective cover of the face is detachable by being glued on transparent polycarbonate, and when it receives a large impact from the outside, the coating film causes the polycarbonate to be damaged. It can prevent fragments from scattering.

Specifically, the self-healing protective film layer adhered to the protective cover includes a dianhydride-based monomer; A first diamine-based monomer containing an aliphatic compound; and a second diamine-based monomer containing a disulfide compound. The copolymerized polyimide resin composition may include a hydrogen bond and a disulfide bond in the main chain or side chain.

Conventional transparent polyimide materials are flexible and have the advantage of high degree of freedom of shape such as bending, folding, bending, etc., and excellent chemical resistance and hardness. However, they have weak resistance to scratches and cracks occur and propagate due to repeated stress and deformation. The physical properties and lifespan of the material depend on the fatigue failure that occurs, which causes the problem of high maintenance costs.

In order to solve this problem, the present invention copolymerizes two types of diamine-based monomers with a dianhydride-based monomer, and in particular, mixes the two types of diamine-based monomers at an optimal ratio to prepare a polyimide resin composition, thereby providing high transparency and It has high rigidity and can significantly improve self-healing properties through dual reversible dynamic bonds of disulfide bonds and hydrogen bonds.

In addition, this self-healing film layer has high transparency and high strength, has excellent mechanical properties, and can improve the lifespan of the film by easily and quickly actively restoring damage (cracks) caused by external stress at low temperatures.

Figure 8 is an image showing the self-healing efficiency and pencil hardness test results of the self-healing protective film layer according to an embodiment of the present invention.

As shown in Figure 8, by applying the self-healing protective film layer according to an embodiment of the present invention, it was confirmed that 99% of scratches or damage to the protective cover that occurred during use could be restored through heat treatment at 100°C for 20 minutes. It can be confirmed that 95% cure is possible when treated at 70°C for 6 hours.

In addition, it can be seen that the self-healing film layer according to one embodiment of the present invention has excellent durability even after being repeatedly folded more than 10,000 times, has a flexible structure capable of bending/folding/rolling, etc., and has excellent visibility with a high transparency of 99%. You can.

With reference to the above description, those skilled in the art to which the present invention pertains will be able to understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features.

Therefore, it should be understood that the above-described embodiments are illustrative in all respects and are not intended to limit the present invention to the above-described embodiments, and that the scope of the present invention is defined by the claims below rather than the detailed description above. It is indicated by, and all changes or modified forms derived from the meaning and scope of the patent claims and equivalent concepts should be construed as being included in the scope of the present invention.

Claims (8)

a body that accommodates the wearer's head, has an upper and occipital portion that is closed, and a lower portion and a facial portion that are open;
A shock-absorbing layer made of memory foam provided on the inner peripheral surface of the main body to relieve shock transmitted to the wearer's head; and
It includes a protective cover disposed on the face portion to protect the wearer's face,
A helmet, characterized in that the main body is formed of a self-reinforcing composite material in which the base material and the reinforcing material are made of the same material.
According to claim 1,
The self-reinforcing composite material is a helmet characterized in that the reinforcing material is laminated and melt-bonded between the base materials.
According to claim 2,
A helmet, wherein the base material is a polypropylene film, and the reinforcing material is polypropylene fiber.
According to claim 1,
A helmet further comprising a flame retardant coating layer formed on the outer peripheral surface of the main body.
According to claim 4,
The flame retardant coating layer is a flame retardant epoxy composite material containing epoxy resin, nanocarbon structure, and curing agent,
The hardening agent is tannic acid, and the nanocarbon structure is graphene oxide coated with tannic acid and reduced by the coated tannic acid.
According to claim 1,
A helmet characterized in that the protective cover is made of a transparent polycarbonate material.
According to claim 6,
The protective cover is a helmet characterized in that it further includes a self-healing protective film layer.
According to claim 7,
The self-healing protective film layer,
Dianhydride-based monomer; A first diamine-based monomer containing an aliphatic compound; and a second diamine-based monomer containing a disulfide compound. A helmet comprising a copolymerized polyimide resin composition containing a hydrogen bond and a disulfide bond.